阅读说明：本技术 用于制造光学组件的方法以及装置 (Method and device for producing an optical component ) 是由 乌尔里希·巴克斯 于 2019-07-02 设计创作，主要内容包括：提出一种用于制造用于光传感器、尤其用于机动车的雨量传感器的光学组件的方法,所述光学组件具有透镜板(16)和安置在透镜板(16)上的遮光板。首先产生光线束(34)。将光线束(34)聚焦到安置在透镜板(16)上的遮光板坯件(20)的子区域上,并且借助于光线束(34)将贯通开口(36)烧入到遮光板坯件(20)中。此外,提出一种用于制造光学组件的装置(10)。(A method for producing an optical component for a light sensor, in particular for a rain sensor of a motor vehicle, having a lens plate (16) and a shading panel arranged on the lens plate (16) is proposed. A bundle of light rays (34) is first generated. The light beam (34) is focused onto a partial region of the shading plate blank (20) arranged on the lens plate (16), and the through opening (36) is burned into the shading plate blank (20) by means of the light beam (34). Furthermore, an apparatus (10) for producing an optical component is proposed.)

1. A method for producing an optical component for a light sensor, in particular for a rain sensor of a motor vehicle, having a lens plate (16) and a shading panel arranged on the lens plate (16), having the following steps:

-generating a bundle of light rays (34);

-focusing the bundle of light rays (34) onto a sub-area of a mask blank (20) placed on the lens plate (16); and

-burning a through opening (36) into the visor blank (20) by means of the bundle of light rays (34).

2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the bundle of light rays (34) extends substantially along a desired main receiving direction (H) of the optical component, in particular along the desired main receiving direction (H) of the optical component.

3. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the light beam (34) is focused by means of a converging lens (18) integrated in the lens plate (16).

4. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the light beam (34) is a laser beam.

5. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the intensity of the bundle of light rays (34) is measured on the side of the light screen blank (20) facing away from the lens plate (16).

6. The method of claim 5, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

varying the power density of the bundle of light rays based on the measured intensity.

7. A device (10) for producing an optical component for a light sensor, in particular for a rain sensor of a motor vehicle, having a light generating device (14), a lens plate (16) and a visor blank (20) arranged on the lens plate (16), wherein the light generating device (14) is designed to generate a bundle of light rays (34), wherein the lens plate (16) comprises at least one converging lens (18), and wherein the visor blank (20) is arranged at least in sections substantially in the focal point of the at least one converging lens (18), in particular of the at least one converging lens (18).

8. The device (10) according to claim 7,

it is characterized in that the preparation method is characterized in that,

the light generating device (14) is designed to generate laser light.

9. The device (10) according to claim 7,

it is characterized in that the preparation method is characterized in that,

the light generating device (14) is arranged such that a main emission direction of the light generating device (14) coincides with a desired main reception direction (H) of the optical component.

10. The device (10) according to claim 7,

it is characterized in that the preparation method is characterized in that,

a light receiving unit (30) is arranged on the side of the shading plate blank (20) facing away from the light generating device (14).

11. The device (10) according to claim 10,

it is characterized in that the preparation method is characterized in that,

the light receiving unit (30) is connected in signal-transmitting manner to a control device (32) which is designed to control the light generating device (14).

Technical Field

The present invention relates to a method for producing an optical component for a light sensor and to an apparatus for producing an optical component for a light sensor.

Background

Typical light sensors known from the prior art (as are used, for example, in rain sensors for motor vehicles) have: a lens plate having at least one converging lens; and at least one light receiving unit. The condensing lens focuses light in a reception angle range around the main reception direction onto the light receiving unit.

Especially for applications of the light sensor requiring a small receiving angle range, a small light receiving unit is required and at the same time an exact relative positioning of the converging lens and the light receiving unit is required, whereby the manufacture of the light sensor is made difficult and/or cost intensive.

Disclosure of Invention

It is therefore an object of the present invention to provide a method and a device for producing an optical component for a light sensor, which method or which device ameliorate the disadvantages of the prior art.

The object is achieved according to the invention by a method for producing an optical component for a light sensor, in particular for a rain sensor of a motor vehicle, having a lens plate and a shading panel arranged thereon, having the following steps: first a bundle of light rays is generated. The light beam is focused onto a subregion of the light screen blank which is arranged on the lens plate and the through-opening is burnt into the light screen blank by means of the light beam.

The optical component obtained by means of the method according to the invention has a defined acceptance angle range, since only light impinging on the lens plate from a specific angle range around the direction of incidence of the bundle of light rays can pass through the through-opening. Light impinging on the lens plate outside the acceptance angle is conversely absorbed by the shutter plate (shutter plate blank with burnt-in through openings). Since the directional characteristic and the reception angle range of the optical component are already defined by the through-opening, a relatively large light receiving unit can be used for the light sensor, which, due to its size, is insensitive to positioning errors. Therefore, the relative positioning of the light receiving unit and the condensing lens is made easier, and the cost for manufacturing the optical assembly (and thus the light sensor) is reduced.

In particular, the wavelength of the light in the light beam lies in a range in which the material constituting the lenticular plate is substantially light-transmitting, in particular light-transmitting, and in which the material constituting the visor blank is substantially light-opaque, in particular light-opaque, preferably absorptive. Accordingly, if the light beam passes through the lens plate, the lens plate absorbs no energy or only a small amount of energy, while the shading panel blank absorbs substantially the entire energy, in particular the entire energy, of the light beam.

According to one embodiment of the invention, the bundle of light rays runs substantially along the desired main receiving direction of the optical component, in particular along the desired main receiving direction of the optical component. The through-opening burned into the shutter blank then defines a receiving angle range of the optical component, which is located around the desired main receiving direction. By means of the method according to the invention, optical components with different main reception directions can be produced in a simple manner, which is achieved in that: the direction of incidence of the generated bundle of rays onto the lens plate is simply changed.

The light beam can be formed by substantially parallel, in particular parallel, converging or diverging light rays.

One aspect proposes that the light beam is focused by means of a converging lens integrated in the lens plate. Therefore, any other optical member for focusing of the light ray bundle is not required, thereby reducing the cost.

Preferably, the beam of light rays is a beam of laser rays. Lasers are particularly suitable for the method according to the invention for a number of reasons. On the one hand, the light generated is substantially monochromatic, in particular monochromatic, so that in a simple manner wavelengths can be selected at which the lens plate is substantially transparent, in particular transparent, whereas the mask blank is absorptive. On the other hand, the optical power density required for burning the through-openings into the shadow mask can be realized particularly simply by means of the lasers known from the prior art.

According to a further aspect, the intensity of the bundle of light rays is measured on the side of the light screen blank facing away from the lens plate. The measured intensity is a quantity for the size of the through opening, so that by measuring the intensity it can be determined very simply when the through opening has reached the desired size. In particular, the intensity is measured by means of a light receiving unit, which can also be a light receiving unit of a light sensor.

In one embodiment of the invention, the power density of the light beam is varied on the basis of the measured intensity. If the measured intensity exceeds a predetermined limit value, for example (which is the case when the burnt-in through opening has reached the desired size), no light beam is generated anymore or at least the power density of the light beam is significantly reduced. Power density is understood herein to mean the energy flux per unit area and time. In other words, the intensity of the generated bundle of light rays is changed.

On the other hand, it is proposed that the method for producing an optical component for a light sensor is a method for producing an optical component for a rain sensor of a motor vehicle.

Accordingly, the desired main reception direction is the following direction: in said direction, the light receiving means of the rain sensor should be sensitive to light incidence.

The object is further achieved according to the invention by a device for producing an optical component for a light sensor, in particular for a rain sensor of a motor vehicle, having a light generating device, a lens plate and a screen blank arranged on the lens plate, wherein the light generating device is designed to generate a light beam, wherein the lens plate comprises at least one converging lens, and wherein the screen blank is arranged at least in sections substantially in the focal point of the at least one converging lens, in particular in the focal point of the at least one converging lens.

Reference is made to the above explanations for the advantages of the device according to the invention for producing an optical component for a light sensor.

One aspect provides that the light generating device is designed to generate laser light.

In a further embodiment of the invention, the light generating device is arranged such that a main emission direction of the light generating device coincides with a desired main reception direction of the optical component.

According to another aspect, a light receiving unit is provided on a side of the light screen blank facing away from the light generating device. In particular, the light receiving unit of the light sensor to be produced.

The light receiving unit can be connected in signal-transmitting manner to a control device which is designed to control the light generating device. Preferably, the control device is designed to automatically adjust the power density of the light beam, in particular on the basis of the intensity of the light beam measured by means of the light receiving device.

On the other hand, it is proposed that the device for producing an optical component for a light sensor is a device for producing an optical component for a rain sensor for a motor vehicle.

Accordingly, the desired main receiving direction is the direction in which the light receiving means of the rain sensor should be sensitive to light incidence.

Drawings

Other advantages and features of the present invention will be apparent from the following description and the accompanying drawings to which reference is made. In which are shown:

figure 1 schematically shows a cross-section through an apparatus for manufacturing an optical component according to the invention;

fig. 2 shows a modified variant of the device of fig. 1.

Detailed Description

Fig. 1 shows an apparatus 10 for producing an optical component. The apparatus 10 includes a blank 12 of an optical assembly and a light generating device 14.

The optical component to be produced from the blank 12 is an optical component for a light sensor, as it is used, for example, in a rain sensor for a motor vehicle. In particular for optical components for light sensors with a narrow acceptance angle range.

The blank 12 has a lens plate 16 with an integrated converging lens 18.

Furthermore, blank 12 includes a visor blank 20 that is positioned on lens panel 16 such that visor blank 20 is disposed at least partially in the focal point of converging lens 18.

The light generating device 14 comprises a light source 22 and a light converging device 24, which in the variant shown in fig. 1 and 2 is formed by two optical lenses 26, 28.

Preferably, the light source 22 is a laser source. It is furthermore preferred that the light source 22 generates laser light in a wavelength range in which the lens plate 16 is substantially transparent, in particular transparent, whereas the mask blank is substantially opaque, in particular opaque, more precisely absorptive.

Alternatively, the light source 22 can also be designed to generate other light suitable for the method described below.

Fig. 2 shows a slightly modified variant of the device in fig. 1, in which a light receiving unit 30 and a control device 32 are additionally provided, wherein the control device 32 is connected to the light receiving unit 30 and the light generating device 14 in a signal-transmitting manner (indicated by dashed lines in fig. 2), in particular to the light source 22.

The light receiving unit 30 is arranged here on the side of the lens plate 16 facing away from the light generating means 14.

In the following, a method for manufacturing an optical component by means of the device 10 according to fig. 1 or fig. 2 is explained.

First, a bundle of light rays 34 is generated by means of the light generating device 14. For this purpose, the light emitted by the light source 22 is brought into the desired shape by means of the light bunching device 24. In particular, the light generating device 14 generates a parallel, converging or diverging bundle of rays 34.

The resulting bundle of light rays 34 extends substantially along the desired main receiving direction H of the optical component to be produced, in particular along the desired main receiving direction H of the optical component to be produced.

The desired main receiving direction H can be a direction in which the light receiving device 14 should be sensitive to light incidence when it is installed in the rain sensor.

The light beam 34 enters the lens plate 16 and is focused by means of the integrated converging lens 18 onto a part of the mask blank 20, which is arranged in the focal point of the converging lens 18. Because the material comprising the lens plate 16 is substantially transparent, in particular transparent, to the laser light, the bundle of light rays 34 passes through the lens plate 16 with substantially no energy output.

The material of the visor blank 20 is conversely made to absorb the light beam 34 so that a through opening 36 (see fig. 2) is burned into the visor blank 20.

Alternatively, as shown in fig. 2, the intensity of the light passing through the through opening 36 is measured by means of the light receiving unit 30. The corresponding measurement signal is forwarded to the control device 32.

Based on the measured intensity, the control device 32 is able to control the light receiving means 14, in particular the light source 22. More specifically, the power density of the bundle of light rays 34 generated by the light generating means 14 is varied in accordance with the measured intensity.

If the measured intensity exceeds a predetermined limit value, for example (which is the case if the burnt-in through opening 36 is sufficiently large), it can be provided that the control device switches off the light source 22 or at least the power of the light source 22 is significantly reduced.

The optical component obtained by means of the method described hereinbefore has a narrow reception angle range, since only light impinging on the lens plate 16 from a specific angle range around the main reception direction H can pass through the through opening 36. Light impinging on the lens plate 16 outside the acceptance angle range is conversely absorbed by the light shield (light shield blank 20 with the burnt-in through openings 36).

Since the directional characteristic and the reception angle range of the optical assembly are already defined by the through opening 36, a relatively large light receiving unit can be used for the light sensor. In particular here the light receiving unit 30 described above.