阅读说明：本技术 导光件和电子设备 (Light guide member and electronic apparatus ) 是由 修成竹 于 2021-09-16 设计创作，主要内容包括：本申请公开了一种导光件和电子设备,电子设备包括光学传感器,导光件包括第一导光部和第二导光部,第二导光部位于第一导光部的背光侧；其中,第一导光部的折射率小于第二导光部的折射率,外部光线经过第一导光部和第二导光部到达光学传感器的感光面。本申请通过设置折射率不同的第一导光部和第二导光部,令外部光线经过两次折射到达感光面,令光线尽可能地远离导光件的侧面,使得进入导光件内部的光线不容易折射出去,令更多的光线被束缚在导光件内部,提升导光件的导光效果,尽可能多满足光学传感器的进光需求,增加光学传感器的灵敏度。(The application discloses a light guide member and an electronic device, wherein the electronic device comprises an optical sensor, the light guide member comprises a first light guide part and a second light guide part, and the second light guide part is positioned on the backlight side of the first light guide part; the refractive index of the first light guide part is smaller than that of the second light guide part, and external light reaches the light sensing surface of the optical sensor through the first light guide part and the second light guide part. This application leads the light portion through setting up the first light guide portion and the second that the refracting index is different, make outside light reach the sensitization face through twice refraction, make light keep away from the side of leaded light spare as far as possible, make the inside light of leaded light spare of entering be difficult to refract away, make more light be tied inside leaded light spare, promote the leaded light effect of leaded light spare, satisfy optical sensor's the light demand of advancing as much as possible, increase optical sensor's sensitivity.)

1. A light guide for an electronic device, the electronic device including an optical sensor, the light guide comprising:

a first light guide part;

a second light guide part positioned at a backlight side of the first light guide part;

the refractive index of the first light guide part is smaller than that of the second light guide part, and external light reaches the light sensing surface of the optical sensor through the first light guide part and the second light guide part.

2. A light guide as claimed in claim 1, further comprising:

and an antireflection layer disposed between the first light guide part and the second light guide part.

3. The light guide of claim 1,

the first light guide part comprises a plurality of first sub-parts, and the refractive indexes of the first sub-parts are gradually increased along the direction close to the second light guide part; and/or

The second light guide part comprises a plurality of second sub-parts, and the refractive indexes of the second sub-parts are gradually increased along the direction departing from the first light guide part.

4. The light guide of claim 1,

the outer side surface of the first light guide part comprises at least one of a plane and a curved surface; and/or

The outer side surface of the second light guide part comprises at least one of a plane and a curved surface.

5. A light guide as claimed in any one of claims 1 to 4, further comprising:

the first reflection layer is arranged on the outer side surface of the first light guide part, and light rays in the first light guide part are reflected by the first reflection layer to be bound in the first light guide part and/or the second light guide part.

6. The light guide of claim 5, further comprising:

and a second reflection layer disposed on an outer side surface of the second light guide portion, wherein light rays in the second light guide portion are reflected by the second reflection layer to be bound in the second light guide portion and/or the first light guide portion.

7. The light guide of claim 6,

the refractive index of the first reflecting layer is greater than that of the first light guide part; and/or

The refractive index of the second reflecting layer is greater than that of the second light guide part.

8. The light guide of claim 6,

the refractive index of the first reflecting layer is gradually increased along the direction close to the second light guide part; and/or

The refractive index of the second reflecting layer is gradually increased along the direction departing from the first light guide part.

9. The light guide of claim 1,

the first light guide portion and the second light guide portion have a width L, the first light guide portion has a height h1, and the second light guide portion has a height h2, so that:

the first light guide part has a refractive index of n1, the second light guide part has a refractive index of n2, and external light enters the first light guide part at an angle α.

10. An electronic device, comprising:

an optical sensor;

the light guide of any of claims 1 to 9, the light guide being located on a light-sensitive side of the optical sensor.

11. The electronic device of claim 10, wherein the electronic device comprises:

the optical sensor is positioned in the accommodating cavity, and at least one part of the light guide piece is positioned in the channel.

Technical Field

The application belongs to the technical field of terminal equipment, and particularly relates to a light guide piece and electronic equipment.

Background

In the related art, as the screen occupation ratio of electronic devices such as mobile phones is higher and higher, the installation space reserved for the optical sensor is smaller and smaller, and in order to transmit the ambient light into the optical sensor as much as possible, a light guide structure is generally arranged to improve the light guide effect.

However, since the light guide structure is not designed properly, the external light will be transmitted to the outer wall of the light guide structure after entering the light guide structure, and then reflected and refracted at the outer wall to cause light energy loss, so that the light energy transmitted to the optical sensor is limited, and the performance of the optical sensor is limited by the amount of light entering the optical sensor.

Disclosure of Invention

The application aims at providing a leaded light spare and electronic equipment, and the leaded light effect that leaded light spare provided is limited among the solution correlation technique at least, can't satisfy one of the problem of optical sensor's demand.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a light guide, where the light guide is used for an electronic device, the electronic device includes an optical sensor, and the light guide includes:

a first light guide part;

a second light guide part positioned at a backlight side of the first light guide part;

the refractive index of the first light guide part is smaller than that of the second light guide part, and external light reaches the light sensing surface of the optical sensor through the first light guide part and the second light guide part.

In a second aspect, an embodiment of the present application provides an electronic device, including: an optical sensor;

as with the light guide provided by the first aspect above, the light guide is located on the light-sensitive side of the optical sensor.

In an embodiment of the present application, the light guide member includes a first light guide portion and a second light guide portion, and the first light guide portion is located on a light incident side of the second light guide portion, that is, the external light first passes through the first light guide portion, then passes through the second light guide portion, and finally reaches the light sensing surface of the optical sensor. Wherein, the refractive index of the first light guide part is smaller than that of the second light guide part, that is, the external light is incident through the first large light guide part with smaller refractive index, so as to reduce the reflection loss of the light on the incident light surface of the light guide part, the external light undergoes the first refraction at the first light guide part and enters the first light guide part, then undergoes the second refraction at the boundary of the first light guide part and the second light guide part and finally reaches the photosensitive surface, the external light reaches the photosensitive surface through the two times of refraction by arranging the first light guide part and the second light guide part with different refractive indexes, so that the light is far away from the outer wall side surface of the light guide part as far as possible, the light entering the light guide part is not easy to be refracted, more light is bound inside the light guide part, the light guide effect of the light guide part is improved, and the light reflection optical path and the energy loss in the light guide column are reduced, therefore, the light inlet requirement of the optical sensor is met as much as possible, and the sensitivity of the optical sensor is increased.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is one of schematic structural diagrams of an electronic device according to an embodiment of the application;

fig. 2 is a second schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 3 is a third schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 4 is a fourth schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 5 is a fifth schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 6 is a sixth schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 7 is a seventh schematic structural diagram of an electronic device according to an embodiment of the present application.

Reference numerals:

1a light guide member, 1a outer side surface,

11a first light guide part, 11a first reflection layer,

12a second light guide part, 12a second reflection layer,

13 an anti-reflection layer for preventing the reflection layer,

2 an electronic device to be connected to the electronic device,

21 an optical sensor.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. 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 features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The light guide 1 and the electronic device 2 according to the embodiment of the present application are described below with reference to fig. 1 to 7.

According to some embodiments of the present invention, the light guide member 1, wherein, as shown in fig. 1 and fig. 2, the light guide member 1 is used for an electronic device 2, the electronic device 2 includes an optical sensor 21, the light guide member 1 includes a first light guide portion 11 and a second light guide portion 12, and the second light guide portion 12 is located on a backlight side of the first light guide portion 11. The refractive index of the first light guide part 11 is smaller than the refractive index of the second light guide part 12, and the external light reaches the light sensing surface of the optical sensor 21 through the first light guide part 11 and the second light guide part 12.

In the embodiment of the present application, the light guide member 1 includes the first light guide portion 11 and the second light guide portion 12, and the first light guide portion 11 is located on the light incident side of the second light guide portion 12, that is, the external light first passes through the first light guide portion 11, then passes through the second light guide portion 12, and finally reaches the light sensing surface of the optical sensor 21. Wherein, the refractive index of the first light guide part 11 is smaller than the refractive index of the second light guide part 12, that is, the external light is incident through the first large light guide part with smaller refractive index, so as to reduce the reflection loss of the light on the incident light surface of the light guide member 1, the external light undergoes the first refraction at the first light guide part 11, enters the first light guide part 11, then undergoes the second refraction at the boundary of the first light guide part 11 and the second light guide part 12, and finally reaches the photosensitive surface, by arranging the first light guide part 11 and the second light guide part 12 with different refractive indexes, the external light undergoes the second refraction to reach the photosensitive surface, the light path is changed, the light is far away from the side surface of the light guide member 1 as far as possible, so that the light entering the inside of the light guide member 1 is not easy to be refracted, more light is bound inside the light guide member 1, and the light guide effect of the light guide member 1 is improved, and the light reflection optical path and the energy loss in the light guide column are reduced, so that the light inlet requirement of the optical sensor 21 is met as much as possible, and the sensitivity of the optical sensor 21 is increased.

Regarding the light guide structure with the unique refractive index in the related art, the light guide structure with the smaller refractive index can refract and reflect light entering the light guide structure for multiple times, so that part of the light can refract out of the light guide structure, and the other part of the light undergoes multiple reflections in the light guide structure, so that the light loss is large, and the requirement of the optical sensor 21 cannot be met. In the present application, the first light guide part 11 with the small refractive index is arranged outward, and the first light guide part 11 with the large refractive index is arranged close to the inner side, so that the loss of light rays in the light guide part 1 can be reduced on the basis of ensuring that the reflection loss of the incident light surface is small, and the light incident amount of the optical sensor 21 is increased.

Specifically, the first light guide part 11 may be formed by injection molding of an acrylic or polycarbonate material.

Further, as shown in fig. 1 and 2, the light guide member 1 further includes an anti-reflection layer 13, and the anti-reflection layer 13 is disposed between the first light guide part 11 and the second light guide part 12.

In this embodiment, during the propagation of the light inside the light guide member 1, the refracted light entering the first light guide portion 11 enters the second light guide portion 12 after passing through the anti-reflection layer 13, and the anti-reflection layer 13 can reduce the reflection loss of the light, so that the light enters the second light guide portion 12 more, the reflected light is reduced as much as possible, and the light entering amount of the optical sensor 21 is increased.

The first light guide portion 11 and the second light guide portion 12 may be integrally formed or may be layered, and then the antireflection layer 13 is coated on the backlight surface of the first light guide portion 11 and/or the light incident surface of the second light guide portion 12, and then the first light guide portion 11 and the second light guide portion 12 are stacked and bonded, so that the manufacturing process is simplified.

As shown in fig. 1 and 2, the first light guide portion 11 and the second light guide portion 12 have both a width L, a height h1 of the first light guide portion 11, and a height h2 of the second light guide portion 12, and satisfy:

here, the refractive index of the first light guide portion 11 is n1, the refractive index of the second light guide portion 12 is n2, and external light enters the first light guide portion 11 at an angle α.

In this embodiment, if the larger refractive index n3 is used as the single-layer light guide structure, the single-layer light guide structure with the larger refractive index may make it easier for the light to reach the light sensing surface of the optical sensor 21 than the light guide structure with two layers of refractive index materials (formed by stacking the first light guide part 11 and the second light guide part 12). However, the reflection loss of the single-layer light structure at the light incident surface is large, so that the light transmitted to the inside of the light guide structure is greatly reduced.

Specifically, according to the fresnel loss law, when an external light ray is assumed to be incident at an incident angle near the normal, the reflectance of the light ray can be expressed asWhere n0 is the refractive index of air (n0 equals 1), and n3 is the refractive index of the single-layer light guide structure. Derivation of equation R can resultSince n3 > 1, the first order function R' is > 0, so the original function R is an increasing function, that is, R increases with the increase of n3, that is, when the refractive index of the single-layer light structure is increased, the reflection loss of the external light at the incident light surface is also increased.

Therefore, in the present application, the light guide member 1 is formed by combining the first light guide portion 11 having a small refractive index and the second light guide portion 12 having a large refractive index, so that the reflection loss at the incident light surface can be avoided, the propagation path of the light inside the light guide member 1 can be improved, and the light can reach the light sensing surface of the optical sensor 21 without passing through the outer side surface 1a of the light guide member 1.

Meanwhile, according to the above formula, when the widths and the corresponding refractive indexes of the first light guide part 11 and the second light guide part 12 are determined, the heights of the first light guide part 11 and the second light guide part 12 can be obtained, so that the light path can be more accurately improved, the number of times of reflecting light inside the light guide member 1 is reduced, and the sensitivity of the optical sensor 21 is improved.

Further, as shown in fig. 3, 4, and 5, the first light guide part 11 includes a plurality of first sub-parts, and refractive indexes of the plurality of first sub-parts gradually increase in a direction approaching the second light guide part 12; and/or second light guide portion 12 includes a plurality of second sub-portions having refractive indices that gradually increase in a direction away from first light guide portion 11.

In this embodiment, for the first light guide part 11 including the plurality of first sub-portions stacked from the outside to the inside, the refractive index of each of the first sub-portions is different, and the refractive indices of the plurality of first sub-portions gradually increase in the outside to the inside direction, the first light guide part 11 may be manufactured by using a material sealing process in which the refractive index gradually increases for manufacturing the first light guide part 11. Similarly, for second light-guiding portion 12 including a plurality of second sub-portions stacked from outside to inside, each second sub-portion having a different refractive index, the refractive indices of the second sub-portions gradually increase in the outside-in direction, and for the preparation of second light-guiding portion 12, second light-guiding portion 12 may be prepared by using a material sealing process with the gradually increasing refractive index.

In summary, for the light guide 1 as a whole, the refractive index of the light guide 1 tends to increase gradually in the direction from the outside to the inside, so that the number of times of reflection of light entering the inside of the light guide 1 can be reduced, and the light loss can be reduced.

Further, as shown in fig. 3, 4 and 5, the outer side surface 1a of the first light guide part 11 includes at least one of a plane and a curved surface; and/or the outer side surface 1a of the second light guide part 12 includes at least one of a flat surface and a curved surface.

In this embodiment, for the light guide member 1, the light guide member 1 includes a light incident surface and a light emitting surface, the light incident surface is an end surface of the first light guide portion 11 departing from the second light guide portion 12, the light emitting surface is an end surface of the second light guide portion 12 departing from the first light guide portion 11, and the light guide member 1 further includes an outer side surface 1a located between the light incident surface and the light emitting surface, that is, the outer side surface 1a is an outer peripheral wall of the light guide member 1. The outer side surface 1a of the first light guide portion 11 and the outer side surface 1a of the second light guide portion 12 form the outer side surface 1a of the light guide member 1, and when the outer side surface 1a of the first light guide portion 11 and/or the outer side surface 1a of the second light guide portion 12 include at least one of a plane and a curved surface, various shapes are provided for the outer side surface 1a of the light guide member 1, for example, the outer side surface 1a of the light guide member 1 is a plane and rectangular. The outer side surface 1a of the light guide member 1 is a curved surface, and the light guide member 1 is in a trapezoid shape, an irregular shape and the like, so that the shape of the light guide member 1 is improved, and the application shape of the light guide member 1 is expanded.

Further, as shown in fig. 6 and 7, the light guide member 1 further includes a first reflective layer 11a, the first reflective layer 11a is disposed on the outer side surface 1a of the first light guide portion 11, and the light in the first light guide portion 11 is reflected by the first reflective layer 11a to be bound inside the first light guide portion 11 and/or the second light guide portion 12.

In this embodiment, the light guide member 1 further includes a first reflective layer 11a, the first reflective layer 11a is disposed on the outer side surface 1a of the first light guide portion 11, after the external light enters the first light guide portion 11 through the light incident surface of the first light guide portion 11, a part of the external light will spread to the outer side surface 1a of the first light guide portion 11, in order to prevent a part of light from being refracted out from the outer side surface 1a of the first light guide part 11, the first reflection layer 11a is disposed on the outer side surface 1a of the first light guide part 11, and the first reflection layer 11a can reflect the light emitted to the outer side surface 1a of the first light guide part 11, so that the part of light returns to the inside of the light guide member 1 again, thereby preventing the light from escaping from the side surface of the first light guide part 11 as much as possible, restraining the light in the inside of the light guide member 1 as much as possible, and increasing the light incoming amount received by the light sensing surface of the optical sensor 21.

Specifically, the first reflective layer 11a may be disposed on the outer side surface 1a of the first light guide part 11 by spraying.

As shown in fig. 6 and 7, the light guide member 1 further includes a second reflective layer 12a disposed on the outer side surface 1a of the second light guide portion 12, and light rays in the second light guide portion 12 are reflected by the second reflective layer 12a to be bound inside the second light guide portion 12 and/or the first light guide portion 11.

In this embodiment, the light guide member 1 further includes a second reflective layer 12a, the second reflective layer 12a is disposed on the outer side surface 1a of the second light guide portion 12, after the external light enters the second light guide portion 12 through the light incident surface of the second light guide portion 12, a part of the light will spread to the outer side surface 1a of the second light guide portion 12, in order to prevent a portion of light from being refracted out from the outer side surface 1a of the second light guide portion 12, a second reflection layer 12a is disposed on the outer side surface 1a of the second light guide portion 12, and the second reflection layer 12a can reflect the light emitted to the outer side surface 1a of the second light guide portion 12, so that the portion of light returns to the inside of the light guide member 1 again, thereby preventing the light from escaping from the side surface of the second light guide portion 12 as much as possible, constraining the light in the inside of the light guide member 1 as much as possible, and increasing the light incoming amount received by the light sensing surface of the optical sensor 21.

Specifically, the second reflective layer 12a may be disposed on the outer side surface 1a of the second light guide part 12 by spraying.

Further, the refractive index of the first reflective layer 11a is greater than the refractive index of the first light guide part 11; and/or the refractive index of the second reflective layer 12a is greater than the refractive index of the second light guide part 12.

In this embodiment, for the outer side surface 1a of the light guide 1, the light reaches the optically thinner medium from the optically denser medium, and therefore, the light will be reflected and refracted at the outer side surface 1a of the light guide 1, where the refractive index of the optically denser medium is n, the optically thinner medium is a gap, and the refractive index is n0, and if the incident angle of the light is greater than the total reflection angle arcsin (n0/n), the light will be totally reflected at the outer side surface 1a of the light guide 1, and the light refracted out of the light guide 1 is reduced. When the first reflective layer 11a and/or the second reflective layer 12a with a larger refractive index are/is sprayed on the outer side of the light guide 1, under the action of the light with the same incident angle, when the light is transmitted in the light guide 1 and can not form total reflection (some light may refract out of the light guide 1), because the first reflective layer 11a and/or the second reflective layer 12a with a larger refractive index are/is increased, the angle of total reflection can be reduced, the total reflection transmission of the light can be realized, and more light can be bound in the light guide 1. The introduction of the first reflective layer 11a and/or the second reflective layer 12a can reduce the total reflection angle, so that the external incident light with large angle is transmitted inside the light guide 1, the light sensing surface of the optical sensor 21 can be effectively reached, and the improvement of the sensitivity of the optical sensor 21 is facilitated.

Further, the refractive index of the first reflective layer 11a gradually increases in a direction closer to the second light guide part 12; and/or the refractive index of the second reflective layer 12a gradually increases in a direction away from the first light guide part 11.

In this embodiment, the refractive index of the first reflective layer 11a and/or the second reflective layer 12a gradually increases in the outside-in direction, and the derivation formula is defined according to the total reflection angle, and the higher the refractive index is, the smaller the total reflection angle is. Therefore, a variation trend of enhanced light confinement ability occurs from the light incident surface to the light emitting surface of the light guide member 1, which is helpful for the light of the long transmission path to be received by the light sensing surface of the optical sensor 21.

An electronic device 2 according to some embodiments of the present application, as shown in fig. 1 to 7, comprises an optical sensor 21 and a light guide 1 as provided in the first aspect above, the light guide 1 being located on a light-sensitive side of the optical sensor 21.

The electronic device 2 provided by the application comprises the light guide member 1 provided by any one of the above designs, so that all the beneficial effects of the light guide member 1 are achieved, and the description is omitted.

Further, the electronic device 2 includes a housing assembly having a light channel and a receiving cavity in communication, the optical sensor 21 being located in the receiving cavity, at least a portion of the light guide 1 being located in the channel.

In this embodiment, the electronic device 2 includes a housing assembly, an optical channel, an optical sensor 21, and the light guide member 1, the housing assembly has a containing cavity, the optical channel is disposed on the housing assembly, the optical channel is communicated with the containing cavity, and the external ambient light can enter the optical channel and enter the containing cavity. The optical sensor 21 is disposed in the accommodating cavity, and the optical sensor 21 is disposed corresponding to the optical channel, that is, external environment light enters the optical channel and can be transmitted to the optical sensor 21, and the optical sensor 21 is a device capable of converting an optical signal into an electrical signal. The optical sensor 21 comprises a light-sensitive surface facing the light channel. The light guide member 1 is arranged on the light-sensitive surface of the corresponding optical sensor 21, at least part of the light guide member 1 is positioned in the light channel, the light guide member 1 can provide a stable light conduction path for the optical sensor 21 in the narrow light channel, and the light guide member 1 utilizes the refraction and reflection characteristics of light, so that the external environment light is transmitted to the light-sensitive surface.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.