阅读说明：本技术 用于对镜头模组中液体透镜的面形标定方法 (Surface shape calibration method for liquid lens in lens module ) 是由 牛亚军 叶海水 于 2019-09-18 设计创作，主要内容包括：本申请实施例公开了一种用于对镜头模组中液体透镜的面形标定方法。该用于对镜头模组中液体透镜的面形标定方法包括：对液体透镜、驱动装置和摄影模组进行预组装,得到镜头模组；通过调整驱动装置的电流,采用镜头模组在预定姿态下对不同距离处的测试图同时拍摄,并测量不同距离处的测试图对应的SFR值；当不同距离处的测试图对应的SFR值同时满足预设规格时,记录标定值。采用该用于对镜头模组中液体透镜的面形标定方法能够提高含液体透镜摄像头的成像品质。(The embodiment of the application discloses a surface shape calibration method for a liquid lens in a lens module. The surface shape calibration method for the liquid lens in the lens module comprises the following steps: preassembling the liquid lens, the driving device and the camera module to obtain a lens module; by adjusting the current of the driving device, the lens module is adopted to shoot the test charts at different distances at the preset posture simultaneously, and SFR values corresponding to the test charts at different distances are measured; and when the SFR values corresponding to the test charts at different distances meet the preset specification at the same time, recording the calibration value. The method for calibrating the surface shape of the liquid lens in the lens module can improve the imaging quality of the liquid lens-containing camera.)

1. A method for calibrating the surface shape of a liquid lens in a lens module is characterized by comprising the following steps:

preassembling the liquid lens, the driving device and the camera module to obtain a lens module;

by adjusting the current of the driving device, the lens module is adopted to shoot the test charts at different distances at the preset posture simultaneously, and SFR values corresponding to the test charts at different distances are measured,

and when the SFR values corresponding to the test charts at different distances meet the preset specification at the same time, recording the calibration value.

2. The method of claim 1, wherein the predetermined postures include upward, downward and forward, wherein the predetermined posture is upward when the lens module shoots the test chart and is directed to the test chart in a direction opposite to a direction of gravity, wherein the predetermined posture is downward when the lens module shoots the test chart and is directed to the same direction as the direction of gravity, and wherein the predetermined posture is forward when the lens module shoots the test chart and is directed to the direction perpendicular to the direction of gravity.

3. The method of claim 1, wherein the liquid lens comprises one or more liquid lenses, wherein one of the liquid lenses comprises one or more liquids.

4. The method of claim 1, wherein the calibration value is a code value of the motor driving the transpose.

5. The method according to claim 1, wherein the method comprises the step of calibrating the surface shape of the liquid lens during close-up shooting and/or long-distance shooting by using the lens module, wherein the distance-increasing lens is used for assisting in the long-distance shooting.

6. The method of claim 5, wherein the near distance is an object distance of less than 40cm and the far distance is an object distance of greater than 70 cm.

7. The method of claim 1, wherein pre-assembling the liquid lens, the driving device and the camera module to obtain a lens module comprises:

securing the liquid lens and the driving device together;

fixing a photographing lens group, an infrared cut-off filter and an image sensor together to obtain the photographing module;

and pre-assembling the fixed liquid lens and the driving device with the fixed photographing module to obtain the lens module.

8. The method according to claims 1-7, wherein after the step of recording calibration values when SFR values corresponding to the test patterns at different distances simultaneously satisfy preset specifications, the method further comprises:

and adding a two-dimension code identifier for the lens module, and storing the calibration value and the two-dimension code identifier in a correlation manner.

9. A surface shape calibration method for liquid lenses in a lens module in batch is characterized by comprising the following steps:

performing surface shape calibration on the liquid lens in one of the lens modules, wherein the one of the lens modules is defined as a gold sample, and the surface shape calibration is performed by using the surface shape calibration method for the liquid lens in the lens module according to any one of claims 1 to 8;

and calibrating other lens modules according to the calibration value of the gold sample, so that batch calibration of a plurality of lens modules is realized.

10. A terminal device, comprising a camera, wherein the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by using the method for calibrating the surface shape of the liquid lens in a lens module according to any one of claims 1 to 8.

11. A terminal device, comprising a camera, wherein the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by using the surface shape calibration method for batch calibration of liquid lenses in a lens module set as claimed in claim 9.

[ technical field ] A method for producing a semiconductor device

The application relates to the technical field of shooting, in particular to a surface shape calibration method for a liquid lens in a lens module.

[ background of the invention ]

With the remarkable improvement of the technology of the terminal equipment of the smart phone, the rapid automatic focusing, optical anti-shake, macro shooting and optical zooming brought by the liquid lens are the main development directions in the technical field of future shooting.

At present, because the film of the liquid lens has elasticity, the liquid lens shows different liquid surface shape (hereinafter referred to as surface shape) errors under different postures under the influence of gravity, meanwhile, a structural member for extruding the film in the liquid lens is composed of a plurality of different motor rotors, the motor rotors work independently, action errors exist, and the action errors can cause the liquid surface shape errors of the liquid lens and influence the imaging quality of a camera.

[ summary of the invention ]

In view of this, an embodiment of the present application provides a method for calibrating a surface shape of a liquid lens in a lens module, so as to solve a problem that an imaging quality of a camera including a liquid lens at present cannot achieve an expected shooting effect.

In a first aspect, an embodiment of the present application provides a method for calibrating a surface shape of a liquid lens in a lens module, including:

preassembling the liquid lens, the driving device and the camera module to obtain a lens module;

and by adjusting the current of the driving device, the lens module is adopted to shoot the test charts at different distances at a preset posture simultaneously, SFR values corresponding to the test charts at different distances are measured, and when the SFR values corresponding to the test charts at different distances meet preset specifications simultaneously, calibration values are recorded.

The foregoing aspects and any possible implementations further provide an implementation in which the predetermined postures include upward, downward, and forward, wherein the predetermined posture is upward when the lens module shoots the test chart and when the direction of the test chart is opposite to the direction of gravity, the predetermined posture is downward when the lens module shoots the test chart and when the direction of the test chart is the same as the direction of gravity, and the predetermined posture is forward when the lens module shoots the test chart and when the direction of the test chart is perpendicular to the direction of gravity.

The above-described aspects and any possible implementations further provide an implementation in which the liquid lens includes one or more liquid lenses, wherein one of the liquid lenses includes one or more liquids.

The above aspect and any possible implementation further provide an implementation in which the calibration value is a code value of a motor that drives the transpose.

The above aspects and any possible implementation manners further provide an implementation manner, and the method includes performing surface shape calibration on the liquid lens during close-up shooting and/or long-distance shooting by using the lens module, wherein an extended range lens is used for assistance during the long-distance shooting.

The above aspect and any possible implementation further provide an implementation in which the near distance is an object distance of less than 40cm and the far distance is an object distance of more than 70 cm.

The above aspect and any possible implementation manner further provide an implementation manner, in which the liquid lens, the driving device and the camera module are preassembled to obtain a lens module, including:

securing the liquid lens and the driving device together;

fixing a photographing lens group, an infrared cut-off filter and an image sensor together to obtain the photographing module;

and pre-assembling the fixed liquid lens and the driving device with the fixed photographing module to obtain the lens module.

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, after the step of recording a calibration value when SFR values corresponding to the test charts at different distances simultaneously satisfy a preset specification, the method further includes:

and adding a two-dimension code identifier for the lens module, and storing the calibration value and the two-dimension code identifier in a correlation manner.

In a second aspect, an embodiment of the present application provides a method for calibrating surface shapes of liquid lenses in a lens module in batch, including:

performing surface shape calibration on the liquid lens in one of the lens modules, wherein the one of the lens modules is defined as a gold sample, and the surface shape calibration is realized by adopting the surface shape calibration method for the liquid lens in the lens module in the first aspect;

and calibrating other lens modules according to the calibration value of the gold sample, so that batch calibration of a plurality of lens modules is realized.

In a third aspect, an embodiment of the present application provides a terminal device, which includes a camera, where the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by using the surface shape calibration method for a liquid lens in a lens module according to the first aspect.

In a fourth aspect, an embodiment of the present application provides a terminal device, including a camera, where the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by using the surface shape calibration method for liquid lenses in batch lens modules in the second aspect.

In the embodiment of the application, a preassembled lens module is adopted, the current of a driving device is adjusted, test charts at different distances are shot at the same time under a preset posture, and SFR values corresponding to the test charts at different distances are measured; whether the SFR values corresponding to the test patterns at different distances meet preset specifications or not is judged to determine and record a calibration value, the calibration value takes the influence factors of gravity and the motor rotor on the surface shape of the liquid lens into consideration, the influence of the gravity and the motor rotor on the surface shape of the liquid lens can be offset, and therefore the imaging quality of pictures shot by the camera containing the liquid lens is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a flowchart illustrating a method for calibrating a surface shape of a liquid lens in a lens module according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the surface shape of a liquid lens in various postures according to an embodiment of the present application;

FIG. 3 is a schematic view illustrating an assembled lens module according to an embodiment of the present application;

FIG. 4 is a flow chart of the surface shape calibration of the liquid lens based on the distance calibration and the near calibration in an embodiment of the present application;

FIG. 5 is a schematic diagram of the liquid lens assembly with different focal lengths in upward position for telephoto shooting according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating assembly and calibration of liquid lenses with different focal lengths in an upward posture during close-up photographing according to an embodiment of the present application.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely a field that describes the same of an associated object, meaning that three relationships may exist, e.g., A and/or B, may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present application, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, the first preset range may also be referred to as a second preset range, and similarly, the second preset range may also be referred to as the first preset range, without departing from the scope of the embodiments of the present application.

The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

Fig. 1 shows a flowchart of a method for calibrating a surface shape of a liquid lens in a lens module according to the present embodiment. The surface shape calibration method for the liquid lens in the lens module can be applied to the quick assembly calibration of a production line containing a liquid lens camera. As shown in fig. 1, the method for calibrating the surface shape of the liquid lens in the lens module includes the following steps:

s10: and pre-assembling the liquid lens, the driving device and the camera module to obtain the lens module.

The liquid lens mainly comprises liquid, a film and a container, and the shape of the liquid level is changed by using motor driving, so that the change of the focal length is realized. The liquid lens can be used in a mobile phone module structure to realize the functions of quick automatic focusing, optical anti-shake, macro shooting, optical zooming and the like.

Wherein, the driving device is used for driving and changing the shape of the liquid in the liquid lens, thereby realizing the change of the focal length. In particular, the drive means may comprise four motor movers. The motor rotors work independently of each other, and action errors exist, so that errors exist in the adjustment of the surface shape of the liquid lens.

The camera module comprises a camera lens group, an infrared cut-off filter and an image sensor.

It can be understood that, because the film of the liquid lens has elasticity, the film is subjected to different liquid gravities to generate different surface shapes in different postures, which may affect the imaging quality of the lens module.

Fig. 2 shows the surface shape of the liquid lens in different postures, and it can be seen from fig. 2 that the surface shape is significantly changed due to the influence of gravity.

In order to eliminate the influence of gravity and a motor mover on the surface shape of the liquid lens, in the present embodiment, the liquid lens, the driving device and the camera module are preassembled, so as to realize surface shape calibration of the liquid lens under the lens module including the liquid lens and the driving device.

Further, in step S10, the liquid lens, the driving device and the camera module are preassembled to obtain a lens module, which specifically includes:

s11: the liquid lens and the driving means are fixed together.

It can be understood that the liquid lens needs a driving device to realize driving zooming, and therefore the liquid lens and the driving device are fixed and combined together, and in particular, the liquid lens and the driving device can be fixed by means of dispensing or the like.

S12: and fixing the photographing lens group, the infrared cut-off filter and the image sensor together to obtain the photographing module.

It will be appreciated that the camera module is used to capture images, and the liquid lens and drive means are used to effect a zoom function of the camera module when capturing. In an embodiment, the photographing lens assembly, the infrared cut-off filter and the image sensor can be fixed together to obtain a photographing module, so that the photographing module is firmer, and the accuracy of surface shape calibration is improved.

Further, the camera module performs an SFR test before or after being fixed, so as to perform specification detection on the camera module. The sfr (spatial frequency response) is mainly used to measure the influence of line increase of spatial frequency on a single image, and is an index describing the spatial frequency response of the imaging system.

S13: and pre-assembling the fixed liquid lens and the driving device with the fixed photographing module to obtain the lens module.

Specifically, fig. 3 shows a schematic diagram of an assembled lens module in which a photographing module performs zoom photographing by changing a surface shape of a liquid lens.

In one embodiment, the lens module may be pre-assembled by using an automated device (e.g., a robot arm) in a production line.

In steps S11-S13, a specific embodiment of obtaining a lens module is provided, in which the liquid lens, the driving device and the camera module are pre-assembled to calibrate the surface shape of the liquid lens under the lens module including the liquid lens and the driving device, so as to eliminate the influence of gravity and the motor mover on the surface shape of the liquid lens.

S20: the current of the driving device is adjusted, the lens module is adopted to shoot the test charts at different distances at the preset posture, the SFR values corresponding to the test charts at different distances are measured, and when the SFR values corresponding to the test charts at different distances meet the preset specification, the calibration values are recorded.

The test chart can be represented by a chart.

It can be understood that the adjustment of the driving device current indicates that the lens module is zooming, and whether the shot image is clear enough is determined by measuring the SFR values corresponding to the test patterns at different distances during zooming.

In an embodiment, the current of the driving device is continuously adjusted to find an SFR value meeting a preset specification when the lens module shoots test patterns at different distances at a preset posture at the same time, so as to obtain a clear image. The SFR value obtained by measurement is a numerical value obtained on the premise that the gravity influence factor and the motor rotor action error factor exist, and can counteract the influence of the gravity and the motor rotor on the surface shape of the liquid lens, so that the imaging quality of pictures shot by the camera containing the liquid lens is improved.

Specifically, the calibration value may be a code value of a motor driving the transpose, where the code value of the motor is used for characterizing a displacement of the motor, where the motor driving the transpose includes a plurality of motor movers, each of the motor movers has an independent code value, and the characterization of the motor displacement is implemented by the code values of the plurality of motor movers. For example, when the shooting distance is 5 meters, the code values of the motor movers in the drive rotation are 1997code, 1999code, and 2000code, respectively; when the shooting record is 2.5cm (macro shooting), the code values of the respective motor movers driving the transposed motor are 3196code, 3198code, 3200code, and 3197code, respectively.

Further, a motor-free driving device may be used to change the surface shape of the liquid lens, and in this case, the calibration value may be specifically a current value or a voltage value input by the motor-free driving device.

Further, the predetermined postures include upward, downward and forward, wherein when the lens module shoots the test chart, the predetermined posture is upward when the direction pointing to the test chart is opposite to the gravity direction, when the lens module shoots the test chart, the predetermined posture is downward when the direction pointing to the test chart is the same as the gravity direction, and when the lens module shoots the test chart, the predetermined posture is forward when the direction pointing to the test chart is perpendicular to the gravity direction.

Specifically, the predetermined postures of upward, downward, and frontward are as shown in fig. 2.

It can be understood that when the camera device containing the liquid lens is used for assembly calibration in a production line, calibration can be specifically carried out from three directions of upward, downward and forward, and the calibration process can improve the calibration accuracy from a three-dimensional angle.

Furthermore, the method for calibrating the surface shape of the liquid lens in the lens module further comprises long-distance shooting calibration and/or short-distance shooting calibration, namely the lens module calibrates the surface shape of the liquid lens during short-distance shooting and/or long-distance shooting, and an extended-range lens is adopted for assistance during long-distance shooting, wherein the short distance is an object distance smaller than 40cm, and the long distance is an object distance larger than 70 cm.

The calibration of the surface shape of the liquid lens during close-up shooting and/or long-distance shooting of the lens module can help the calibrated lens module to realize macro shooting (less than 5cm) and normal shooting (including telephoto shooting) when shooting images.

In one embodiment, the calibration process is specifically divided into distance calibration and near calibration, and specifically, as shown in fig. 4, a flow chart of performing surface shape calibration of the liquid lens based on the distance calibration and the near calibration is shown. The surface shape calibration process starts from remote calibration and specifically comprises the following steps:

s211: a distance increasing lens is arranged in front of the shooting position of the lens module and used for prolonging the focal length;

s212: adjusting the (four-axis) current of a driving device, simultaneously shooting test charts at different distances from a long distance under a preset posture, and measuring corresponding SFR values;

s213: judging whether SFR values corresponding to the test charts at different distances from a long distance meet preset specifications or not;

s214: if not, returning to S212, and if so, recording a calibration value;

s215: extracting a distance-increasing lens;

s216: adjusting the (four-axis) current of the driving device, simultaneously shooting test patterns at different distances of a short distance under a preset posture, and measuring corresponding SFR values;

s217: judging whether the SFR values corresponding to the test patterns at different distances of the short distance meet the preset specification simultaneously;

s218: if not, returning to the step S216, and if so, recording the calibration value.

Steps S211-S218 provide an embodiment of a method for pattern calibration of a liquid lens.

Further, fig. 5 shows a schematic diagram of the assembly calibration of liquid lenses with different focal lengths in the upward posture in telephoto shooting.

Further, fig. 6 is a schematic diagram illustrating assembly and calibration of liquid lenses with different focal lengths in an upward posture during close-up shooting.

Further, the graphic calibration process may also start from near calibration, and the specific implementation steps of the calibration process are as follows:

s221: adjusting the (four-axis) current of the driving device, simultaneously shooting test patterns at different distances of a short distance under a preset posture, and measuring corresponding SFR values;

s222: judging whether SFR values corresponding to test patterns at different distances meet preset specifications at the same time during short-distance shooting;

s223: if not, returning to the step S221, and if so, recording a calibration value;

s224: adding a distance-increasing mirror;

s225: adjusting the (four-axis) current of a driving device, simultaneously shooting test charts at different distances from a long distance under a preset posture, and measuring corresponding SFR values;

s226: judging whether SFR values corresponding to the test charts at different distances from a long distance meet preset specifications or not;

s227: if not, the process returns to S225, and if so, the calibration value is recorded.

In an embodiment, if the SFR values corresponding to the test patterns at different distances simultaneously satisfy the preset specification, it indicates that the captured image is still clear enough under the gravity influence factor and the motor rotor motion error factor, and at this time, the calibration value is recorded.

The calibration value is used for calibrating the surface shape of the liquid lens, and the calibration value is used for calibrating the surface shape of the liquid lens.

In this embodiment, the lens module including the liquid lens adopts the above surface shape calibration method for the liquid lens in the lens module, and can flexibly adjust the object distance selected during shooting, thereby realizing macro shooting below 5cm, and realizing a macro shooting function with high imaging quality.

Further, in embodiments of the present application, the liquid lens comprises one or more liquid lenses, wherein one liquid lens comprises one or more liquids. It is understood that a plurality of liquid lenses can be introduced into the image pickup apparatus including the liquid lens, and continuous optical zooming can be realized with a reasonably designed optical path.

Further, after the step of recording the calibration value when the SFR values corresponding to the test patterns at different distances simultaneously satisfy the preset specification, the method further includes:

and adding a two-dimension code identifier for the lens module, and storing the calibration value and the two-dimension code identifier in a correlation manner.

The liquid lens module is characterized in that the liquid lens module is a liquid lens module, and the liquid lens module is a liquid lens module which is used for being assembled and calibrated on line. In addition, the calibration value and the two-dimensional code mark are stored in a correlation mode, when the lens module has a fault in the aspect of calibration, the calibration value during assembly calibration can be searched through the two-dimensional code mark, and calibration is carried out again.

In the embodiment of the application, a preassembled lens module is adopted, the current of a driving device is adjusted, test charts at different distances are shot at the same time under a preset posture, and SFR values corresponding to the test charts at different distances are measured; whether the SFR values corresponding to the test patterns at different distances meet preset specifications or not is judged to determine and record a calibration value, the calibration value takes the influence factors of gravity and the motor rotor on the surface shape of the liquid lens into consideration, the influence of the gravity and the motor rotor on the surface shape of the liquid lens can be offset, and therefore the imaging quality of pictures shot by the camera containing the liquid lens is improved.

Lens module this application embodiment still provides a shape of face calibration method for liquid lens among a plurality of lens modules in batches, and it includes following step:

s100: and carrying out surface shape calibration on the liquid lens in one of the lens modules, wherein one of the lens modules is defined as a gold sample.

Specifically, the surface shape calibration in S100 is realized by adopting the previous S10-S20;

s200: and calibrating other lens modules according to the calibration value of the gold sample, so that a plurality of lens modules are calibrated in batch.

It is understood that, in the case of performing a fast assembly calibration of a lens module production line containing liquid lenses, a gold Sample (also called a standard Sample) may be used as a target lens module.

In an embodiment, a gold sample may be specifically used to calibrate the surface shape of the liquid lens, and after a gold sample is calibrated, other uncalibrated lens modules may be calibrated in batch by using the calibration value obtained by the gold sample, so that the efficiency of fast assembly and calibration of a lens module production line containing the liquid lens can be obviously improved on the premise of ensuring the calibration accuracy.

In the embodiment of the application, the surface shape of the liquid lens is calibrated by defining the golden sample, so that the quick batch calibration of a plurality of lens modules can be realized.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The embodiment provides a terminal device, which includes a camera, wherein the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by the following steps:

and pre-assembling the liquid lens, the driving device and the camera module to obtain the lens module.

The liquid lens mainly comprises liquid, a film and a container, and the shape of the liquid level is changed by using motor driving, so that the change of the focal length is realized. The liquid lens can be used in a mobile phone module structure to realize the functions of quick automatic focusing, optical anti-shake, macro shooting, optical zooming and the like.

Wherein, the driving device is used for driving and changing the shape of the liquid in the liquid lens, thereby realizing the change of the focal length. In particular, the drive means may comprise four motor movers. The motor rotors work independently of each other, and action errors exist, so that errors exist in the adjustment of the surface shape of the liquid lens.

The camera module comprises a camera lens group, an infrared cut-off filter and an image sensor.

It can be understood that, because the film of the liquid lens has elasticity, the film is subjected to different liquid gravities to generate different surface shapes in different postures, which may affect the imaging quality of the lens module.

In order to eliminate the influence of gravity and a motor mover on the surface shape of the liquid lens, the driving device and the camera module are preassembled in the embodiment, so that the surface shape of the liquid lens is calibrated under the lens module comprising the liquid lens and the driving device.

Further, preassemble liquid lens, drive arrangement and camera module, obtain the lens module in, specifically include:

the liquid lens and the driving means are fixed together.

It can be understood that the liquid lens needs a driving device to realize driving zooming, and therefore the liquid lens and the driving device are fixed and combined together, and in particular, the liquid lens and the driving device can be fixed by means of dispensing or the like.

And fixing the photographing lens group, the infrared cut-off filter and the image sensor together to obtain the photographing module.

It will be appreciated that the camera module is used to capture images, and the liquid lens and drive means are used to effect a zoom function of the camera module when capturing. In an embodiment, the photographing lens assembly, the infrared cut-off filter and the image sensor can be fixed together to obtain a photographing module, so that the photographing module is firmer, and the accuracy of planar calibration of the liquid lens is improved.

Further, the camera module performs an SFR test before or after being fixed, so as to perform specification detection on the camera module.

And pre-assembling the fixed liquid lens and the driving device with the fixed photographing module to obtain the lens module.

In one embodiment, the lens module may be pre-assembled by using an automated device (e.g., a robot arm) in a production line.

The method comprises the steps of pre-assembling a liquid lens, a driving device and a photographing module to obtain a lens module, simultaneously photographing test patterns at different distances by adopting the lens module under a preset posture by adjusting the current of the driving device, measuring SFR values corresponding to the test patterns at the different distances, and recording a calibration value when the SFR values corresponding to the test patterns at the different distances meet preset specifications at the same time.

The test chart can be represented by a chart.

It can be understood that the adjustment of the driving device current indicates that the lens module is zooming, and whether the shot image is clear enough is determined by measuring the SFR values corresponding to the test patterns at different distances during zooming.

In an embodiment, the current of the driving device is continuously adjusted to find an SFR value meeting a preset specification when the lens module shoots test patterns at different distances at a preset posture at the same time, so as to obtain a clear image. The SFR value obtained by measurement is a numerical value obtained on the premise that the gravity influence factor and the motor rotor action error factor exist, and can counteract the influence of the gravity and the motor rotor on the surface shape of the liquid lens, so that the imaging quality of pictures shot by the camera containing the liquid lens is improved.

Specifically, the calibration value may be a code value of a motor driving the transpose, where the code value of the motor is used for characterizing a displacement of the motor, where the motor driving the transpose includes a plurality of motor movers, each of the motor movers has an independent code value, and the characterization of the motor displacement is implemented by the code values of the plurality of motor movers. For example, when the shooting distance is 5 meters, the code values of the motor movers in the drive rotation are 1997code, 1999code, and 2000code, respectively; when the shooting record is 2.5cm (macro shooting), the code values of the respective motor movers driving the transposed motor are 3196code, 3198code, 3200code, and 3197code, respectively.

Further, a motor-free driving device may be used to change the surface shape of the liquid lens, and in this case, the calibration value may be specifically a current value or a voltage value input by the motor-free driving device.

Further, the predetermined postures include upward, downward and forward, wherein when the lens module shoots the test chart, the predetermined posture is upward when the direction pointing to the test chart is opposite to the gravity direction, when the lens module shoots the test chart, the predetermined posture is downward when the direction pointing to the test chart is the same as the gravity direction, and when the lens module shoots the test chart, the predetermined posture is forward when the direction pointing to the test chart is perpendicular to the gravity direction.

It can be understood that when the camera device containing the liquid lens is used for assembly calibration in a production line, calibration can be specifically carried out from three directions of upward, downward and forward, and the calibration process can improve the calibration accuracy from a three-dimensional angle.

Furthermore, the method for calibrating the surface shape of the liquid lens in the lens module further comprises far distance calibration and/or near distance calibration, namely the lens module calibrates the surface shape of the liquid lens during near distance shooting and/or far distance shooting, and an extended distance lens is adopted for assistance during far distance shooting, wherein the near distance is an object distance smaller than 40cm, and the far distance is an object distance larger than 70 cm.

The calibration of the surface shape of the liquid lens during close-up shooting and/or long-distance shooting of the lens module can help the calibrated lens module to realize macro shooting (less than 5cm) and normal shooting (including telephoto shooting) when shooting images.

In an embodiment, the calibration process is specifically divided into a distance calibration and a near calibration, and specifically includes:

a distance-increasing lens is arranged in front of the shooting position of the lens module and used for extending the object distance;

adjusting the (four-axis) current of a driving device, simultaneously shooting test charts at different distances from a long distance under a preset posture, and measuring corresponding SFR values;

judging whether SFR values corresponding to the test charts at different distances from a long distance meet preset specifications or not;

if the current does not meet the requirement, returning to adjust the (four-axis) current of the driving device, simultaneously shooting the test charts at different distances from a long distance under a preset posture, and measuring a corresponding SFR value;

extracting a distance-increasing lens;

adjusting the (four-axis) current of the driving device, simultaneously shooting test patterns at different distances of a short distance under a preset posture, and measuring corresponding SFR values;

judging whether the SFR values corresponding to the test patterns at different distances of the short distance meet the preset specification simultaneously;

and if the current does not meet the requirement, returning to the step of adjusting the (four-axis) current of the driving device, simultaneously shooting the test charts at different short distances under a preset posture, measuring the corresponding SFR value, and if the current meets the requirement, recording the calibration value.

Further, the graphic calibration process may also start from near calibration, and the specific implementation steps of the calibration process are as follows:

adjusting the (four-axis) current of the driving device, simultaneously shooting test patterns at different distances of a short distance under a preset posture, and measuring corresponding SFR values;

judging whether the SFR values corresponding to the test patterns at different distances of the short distance meet the preset specification simultaneously;

if the current does not meet the requirement, returning to adjust the (four-axis) current of the driving device, simultaneously shooting the test charts at different short distances under a preset posture, and measuring the corresponding SFR value;

adding a distance-increasing mirror;

adjusting the (four-axis) current of a driving device, simultaneously shooting test charts at different distances from a long distance under a preset posture, and measuring corresponding SFR values;

judging whether SFR values corresponding to the test charts at different distances from a long distance meet preset specifications or not;

and if the current does not meet the requirement, returning to adjust the (four-axis) current of the driving device, simultaneously shooting the test graphs at different distances from the remote place under a preset posture, measuring the corresponding SFR value, and if the current meets the requirement, recording the calibration value.

In an embodiment, if the SFR values corresponding to the test patterns at different distances simultaneously satisfy the preset specification, it indicates that the captured image is still clear enough under the gravity influence factor and the motor rotor motion error factor, and at this time, the calibration value is recorded.

The calibration value is used for calibrating the surface shape of the liquid lens, and the calibration value is used for calibrating the surface shape of the liquid lens.

The lens module containing the liquid lens adopts the surface shape calibration method for the liquid lens in the lens module, the object distance selected during shooting can be flexibly adjusted, macro shooting below 5cm is realized, and a macro shooting function with high imaging quality is realized.

Further, in embodiments of the present application, the liquid lens comprises one or more liquid lenses, wherein one liquid lens comprises one or more liquids. It is understood that a plurality of liquid lenses can be introduced into the image pickup apparatus including the liquid lens, and continuous optical zooming can be realized with a reasonably designed optical path.

Further, after the step of recording the calibration value when the SFR values corresponding to the test patterns at different distances simultaneously satisfy the preset specification, the method further includes:

and adding a two-dimension code identifier for the lens module, and storing the calibration value and the two-dimension code identifier in a correlation manner.

The liquid lens module is characterized in that the liquid lens module is a liquid lens module, and the liquid lens module is a liquid lens module which is used for being assembled and calibrated on line. In addition, the calibration value and the two-dimensional code mark are stored in a correlation mode, when the lens module has a fault in the aspect of calibration, the calibration value during assembly calibration can be searched through the two-dimensional code mark, and calibration is carried out again.

The embodiment further provides a terminal device, which includes a camera, wherein the camera includes a liquid lens, and the surface shape calibration of the liquid lens is implemented by the following steps:

performing surface shape calibration on a liquid lens in one of the lens modules, wherein one of the lens modules is defined as a gold sample; specifically, the surface shape calibration of the liquid lens is realized by adopting S10-S20 in the embodiment;

and calibrating other lens modules according to the calibration value of the gold sample, so that a plurality of lens modules are calibrated in batch.

It can be understood that, when the lens module production line containing the liquid lens is rapidly assembled and calibrated, the gold sample can be used as the target lens module.

In an embodiment, a gold sample may be specifically used to calibrate the surface shape of the liquid lens, and after a gold sample is calibrated, other uncalibrated lens modules may be calibrated in batch by using the calibration value obtained by the gold sample, so that the efficiency of fast assembly and calibration of a lens module production line containing the liquid lens can be obviously improved on the premise of ensuring the calibration accuracy.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

It is noted that a portion of this patent application contains material which is subject to copyright protection. The copyright owner reserves the copyright rights whatsoever, except for making copies of the patent files or recorded patent document contents of the patent office.