TWM658214U - Lens stray light detection system - Google Patents

Abstract

A lens stray light detection system includes a light collecting cover, a light source group, a lens to be tested and an imaging group, wherein the light collecting cover defines a reflective portion; the light source group has a light source and a wide-angle lens that are correspondingly arranged, the wide-angle lens is arranged opposite to the reflective portion of the light collecting cover, the light source generates a first light ray that is converted into a plurality of second light rays by the wide-angle lens to scatter at multiple angles, and part of the second light rays is converted into a third light ray by the reflective portion of the light collecting cover; the lens to be tested is arranged facing the reflective portion of the light collecting cover, the lens to be tested receives the second light ray and/or the third light ray and converts it into a fourth light ray; the imaging group receives the fourth light ray and converts it into a fifth light ray, and converts the fifth light ray into an image signal. In this way, the stray light of the lens to be tested is accurately determined by the image signal.

Description

Lens astigmatism detection system

This invention is about a lens detection system, in particular, about a lens astigmatism detection system.

With the advancement of technology, optical lenses have been widely used in daily life, such as mobile phone lenses, cameras, and driving assistance systems such as dashcams, lane departure warning systems, and driving vision assistance systems. Optical lenses are prone to stray light under strong light. Stray light is unnecessary or additional light derived from the optical system, which will reduce image contrast and imaging quality.

Therefore, after the lens is manufactured, the industry will test the stray light of the lens to monitor the quality of the lens or conduct subsequent analysis and improvement. The commonly used stray light detection method is to hold a light source (such as a flashlight) or lens in a dark room and illuminate a specific position on the lens surface to observe whether stray light is generated.

However, the handheld method makes it difficult to control the angle of the light source shining on the lens, and it is even more difficult to keep the light source shining on a specific position on the lens surface, which may affect the accuracy of stray light detection, and thus affect the quality monitoring of the lens or subsequent analysis and improvement.

In view of this, the creator of this case worked hard to research and create, and finally developed and completed the lens astigmatism detection system of this creation.

The purpose of this invention is to provide a lens stray light detection system to solve the problems mentioned in the previous technology.

According to an embodiment of the invention, a lens stray light detection system is provided, which defines a direction. The lens stray light detection system is provided with a light collecting mask, a light source group, a lens to be tested and an imaging group along the direction, wherein the light collecting mask defines a reflective portion to form a light collecting space, the light collecting mask is provided with a first group of openings and a second group of openings corresponding to the first group of openings, and the first group of openings penetrates the reflective portion; the light source group has a light source and a wide-angle lens that are correspondingly arranged, the reflective portion of the wide-angle lens is arranged at the first group of openings with its back to the light collecting mask, and the light source generates a first light beam through the first group of openings. The wide-angle lens converts into a plurality of second light rays to scatter into the light-collecting space, and part of the second light rays is converted into a third light ray through the reflective portion of the light-collecting cover; the lens to be tested is arranged at the second group opening facing the reflective portion of the light-collecting cover, and the lens to be tested receives the second light rays and/or the third light rays and converts them into a fourth light ray; the imaging group has an imaging lens and an image capturer that are correspondingly arranged, the imaging lens receives the fourth light ray and converts it into a fifth light ray, and the image capturer receives the fifth light ray and converts it into an image signal to determine a stray light of the lens to be tested.

This invention does not need to change the position of the wide-angle lens, so that the wide-angle lens and the lens to be tested can maintain a distance, which helps to accurately judge the stray light appearing in the lens to be tested.

This invention converts the light from the wide-angle lens into the second light or then converts it into the third light through the reflection part to supply the lens to be tested for testing. It can supply light at multiple angles without changing the position of the wide-angle lens.

This invention uses a light collecting cover to effectively block interfering light and ensure the accuracy of the lens under test.

The above is only used to explain the problems that this creation wants to solve, the technical means to solve the problems and the effects produced, etc. The specific details of this creation will be introduced in detail in the implementation methods and related diagrams below.

[Original work]

10: Lens astigmatism detection system

Z: Direction

20: Light collecting cover

201: The first group of mouths

202: The second group of mouths

203: The third group of mouths

20A: Light-collecting space

20B: The Third Ray

21: Reflection part

22: Absorption part

30: Light source set

31: Light source

31A: First Light

32: Wide-angle lens

32A: Second Ray

321: First physical side

322: First image side

40: Lens to be tested

40A: The fourth ray

41: Second physical side

42: Second image side

50: Imaging Group

50A: The Fifth Ray

51: Imaging lens

511: The third side

512: Third image side

52: Image Capture

Figure 1: Schematic diagram of the first combination of the lens astigmatism detection system of this invention.

Figure 2: Schematic diagram of the second combination of the lens stray light detection system of this invention.

In order to give you a better understanding of this invention, the preferred embodiment is given with diagrams, and the details are as follows: Please refer to Figures 1 to 2. This invention provides a lens stray light detection system 10 that defines a direction Z. The lens stray light detection system 10 is provided with a light collecting mask 20, a light source group 30, a lens to be tested 40 and an imaging group 50 along the direction Z, wherein: the light collecting mask 20 (please refer to Figure 1) is described as follows. The light collecting mask 20 is approximately a hollow hemisphere. The light collecting mask 20 defines a reflective portion 21 to form a light collecting space 20A in a hollow open state, and the inner wall of the reflective portion 21 corresponding to the light collecting space 20A defines a first curvature.

The light collecting cover 20 is provided with a first group of openings 201 and a second group of openings 202 corresponding to the first group of openings 201. The first group of openings 201 penetrates the central part of the reflective part 21, but is not limited to the central part. The first group of openings 201 is defined with a first opening ratio, and the second group of openings 202 is defined with a second opening ratio. The first opening ratio is smaller than the second opening ratio. The size of the first opening ratio will affect the reflection area of the reflective part 21 and can be changed according to needs.

The light source set 30 (please refer to FIG. 1 ) is described as follows. The light source set 30 is arranged opposite to the reflective portion 21 of the light collecting cover 20 . The light source set 30 has a light source 31 and a wide-angle lens 32 arranged accordingly. The light source 31 can be a point light source or a collimated light source. The light source 31 can be visible light with a wavelength range of about 390 nanometers (nm) to 700 nanometers (nm), or infrared light with a wavelength range of about 760 nanometers (nm) to 1 millimeter (mm). The light source 31 used in this invention is infrared light, which helps to judge stray light, but is not limited to infrared light.

The light source 31 generates a first light ray 31A, which is converted into a plurality of second light rays 32A by the wide-angle lens 32 and scattered to the light-collecting space 20A at multiple angles. The conversion method can be refraction. In this way, the wide-angle lens 32 can supply light at multiple angles without adjusting its position according to different angles.

The wide-angle lens 32 defines a first object side 321 and a first image side 322 corresponding to the first object side 321. The first object side 321 of the wide-angle lens 32 is arranged at the first group opening 201 opposite to the reflective portion 21 of the light collecting cover 20, so that the first image side 322 is arranged corresponding to the light source 31 to receive the first light 31A.

It should be noted that the wide-angle lens 32 is mainly assembled so as not to affect the second light 32A from entering the light collecting cover 20. In this way, part of the second light 32A can be smoothly converted into a third light 20B through the reflective portion 21 of the light collecting cover 20. The conversion method can be reflection. The third light 20B may also pass through the reflective portion 21 again. Here, it is generally referred to as the third light 20B.

The lens 40 to be tested (please refer to FIG. 1 ) is described as follows. The lens 40 to be tested is arranged facing the reflective portion 21 of the light collecting cover 20 . The lens 40 to be tested is defined with a second object side 41 and a second image side 42 corresponding to the second object side 41 . The second object side 41 of the lens 40 to be tested is arranged facing the reflective portion 21 of the light collecting cover 20 at the second group port 202 , so that the second object side 41 receives the second light 32A and/or the third light 20B and converts it into a fourth light 40A. The conversion method can be refraction. The scattered second light 32A and the reflected third light 20B are combined to supply the lens 40 to be tested at multiple angles, so that light at different angles can be supplied without adjusting the position of the wide-angle lens 32 .

The imaging unit 50 (see FIG. 1 ) is described below. One embodiment of the imaging unit 50 is a camera. The imaging unit 50 has an imaging lens 51 and an image capturer 52 that are configured accordingly. The imaging lens 51 defines a third object side 511 and a third image side 512 corresponding to the third object side 511. The third object side 511 of the imaging lens 51 is configured correspondingly to the second image side 42 of the lens 40 to be tested to receive the fourth light 40A and convert it into a fifth light 50A. The conversion method can be refraction. The image capturer 52 is configured correspondingly to the third image side 512 to receive the fifth light 50A and convert it into an image signal.

The image capture device 52 is also connected to an analysis unit to receive image signals to analyze a veiling glare index (VGI) and/or a glare spread function (GSF) to determine a veiling glare condition of the lens 40 to be tested, but is not limited to analyzing the veiling glare index and the glare spread function.

The image capture device 52 may be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), but is not limited thereto.

The imaging lens 51 and the image capture device 52 can be assembled into an imaging unit 50 through a housing.

The light source set 30 or the imaging set 50 can also be assembled in a driving component to adjust the corresponding relationship between the components (such as the optical parameters between each other), and the driving component drives the light source set 30 or the imaging set 50 to move along the direction Z as one of the implementation forms.

The light collecting cover 20, the light source set 30, the lens to be tested 40 and/or the imaging set 50 can also be assembled on a supporting member, one implementation form of the supporting member is a bracket to maintain the corresponding relationship between the components (such as the relative position between each other).

Please refer to Figure 2. The light collecting cover 20 is provided with an absorption part 22 connected to the reflection part 21 at the second group opening 202 to form a hollow closed light collecting space 20A. The absorption part 22 is composed of a light absorbing material to absorb the second light 32A and/or the third light 20B not received by the lens 40 to be tested. The absorption part 22 helps to improve the accuracy of the detection of the lens 40 to be tested. The reflection part 21 is composed of a reflective material to reflect the second light 32A.

The inner wall of the absorption part 22 corresponding to the light collecting space 20A defines a second curvature, the first curvature of the reflection part 21 is greater than the second curvature of the absorption part 22, the first curvature is approximately greater than 0 and approximates a curved surface, and the second curvature is approximately equal to 0 and approximates a flat surface, but it is not limited to a curved surface or a flat surface.

The reflective portion 21 of the light collecting cover 20 can be used independently or in combination with the absorbing portion 22. The reflective portion 21 and the absorbing portion 22 can be integrally formed to form the light collecting cover 20, or they can be independent components connected to form the light collecting cover 20.

The light collecting cover 20 is provided with a third group of openings 203 corresponding to the first group of openings 201. The third group of openings 203 is provided with an absorption part 22. At this time, the first object side 321 of the wide-angle lens 32 corresponds to the absorption part 22 of the light collecting cover 20, and the second object side 41 of the lens 40 to be tested corresponds to the reflection part 21 of the light collecting cover 20 and is provided in the third group of openings 203. The third group of openings 203 is defined with a third opening ratio, which is smaller than the second opening ratio. The size of the third opening ratio will affect the absorption area of the absorption part 22 and can be changed according to needs.

It should be noted that the lens 40 to be tested is assembled so as not to affect the second light 32A and/or the third light 20B from entering the lens 40 to be tested. In this way, the second light 32A and/or the third light 20B can be smoothly converted into the fourth light 40A through the lens 40 to be tested.

The descriptions of "first", "second", "third", "fourth" and "fifth" mentioned in this work are used for distinction and do not represent the order of precedence. The components mentioned in this work and the components include tolerances (the allowable error range of a specific size, such as dimensional tolerance, geometric tolerance or fit tolerance). The first light 31A, the second light 32A, the third light 20B, the fourth light 40A and the fifth light 50A in Figures 1 and 2 of this work are indicated by arrows as directions, and are not used to limit the direction of the light.

In summary, the invention provides a lens stray light detection system 10, which provides the following effects by matching the reflective portion 21 of the light collecting cover 20 with the wide-angle lens 32 of the light source unit 30: First, the wide-angle lens 32 and the lens 40 to be tested can be kept at a distance without changing the position of the wide-angle lens 32, which helps to accurately judge the stray light of the second light 32A and/or the third light 20B appearing in the lens 40 to be tested.

In addition, the wide-angle lens 32 is converted into the second light 32A or further converted into the third light 20B through the reflector 21 to be supplied to the lens 40 to be tested. The light can be supplied at multiple angles without changing the position of the wide-angle lens 32.

Furthermore, the light collecting cover 20 can effectively block the interfering light other than the second light 32A and/or the third light 20B, thereby ensuring the accuracy of the detection of the lens 40 to be tested.

Finally, the above disclosed embodiments are not used to limit this creation. Anyone familiar with this technology can make various changes and modifications within the spirit and scope of this creation, and all of them can be protected in this creation. Therefore, the scope of protection of this creation shall be determined by the scope of the attached patent application.

10: Lens astigmatism detection system

Z: Direction

20: Light collecting cover

201: The first group of mouths

202: The second group of mouths

20A: Light-collecting space

20B: The Third Ray

21: Reflection part

30: Light source set

31: Light source

31A: First Light

32: Wide-angle lens

32A: Second Ray

321: First physical side

322: First image side

40: Lens to be tested

40A: The fourth ray

41: Second physical side

42: Second image side

50: Imaging Group

50A: The Fifth Ray

51: Imaging lens

511: The third side

512: Third image side

52: Image Capture

Claims (10)

A lens stray light detection system defines a direction, and the lens stray light detection system is provided along the direction: a light collecting cover, defining a reflective portion to form a light collecting space, the light collecting cover is provided with a first group of openings and a second group of openings corresponding to the first group of openings, the first group of openings penetrates the reflective portion; a light source group, having a light source and a wide-angle lens that are provided with a corresponding light source, the reflective portion of the wide-angle lens facing away from the light collecting cover is provided at the first group of openings, the light source generates a first light ray that is converted into a plurality of second light rays through the wide-angle lens to be scattered to the A light collecting space, part of the second light rays are converted into a third light ray through the reflective portion of the light collecting cover; a lens to be tested is arranged at the second group opening facing the reflective portion of the light collecting cover, the lens to be tested receives the second light rays and/or the third light rays and converts them into a fourth light ray; and an imaging group, having an imaging lens and an image capturer arranged accordingly, the imaging lens receives the fourth light ray and converts it into a fifth light ray, the image capturer receives the fifth light ray and converts it into an image signal to judge a stray light of the lens to be tested. The lens stray light detection system as described in claim 1, wherein the light source is a point light source or a collimated light source, and the light source is visible light or infrared light. The lens stray light detection system as described in claim 1, wherein the wide-angle lens defines a first object side and a first image side corresponding to the first object side, the first object side of the wide-angle lens is arranged at the first group port, and the first image side of the wide-angle lens corresponds to the light source. The lens stray light detection system as described in claim 1, wherein the lens to be tested defines a second object side and a second image side corresponding to the second object side, and the second object side of the lens to be tested is arranged at the second group port. The lens stray light detection system as described in claim 4, wherein the imaging lens defines a third object side and a third image side corresponding to the third object side, the third object side of the imaging lens corresponds to the second image side of the lens to be tested, and the third image side of the imaging lens corresponds to the image capturer. The lens stray light detection system as described in claim 1, wherein the image capturer is connected to an analysis unit to receive the image signal to analyze a stray light coefficient and/or stray light diffusion function to determine the stray light of the lens to be tested. The lens stray light detection system as described in claim 1, wherein the image capture device is a photosensitive coupling element or a complementary metal oxide semiconductor. The lens stray light detection system as described in claim 1, wherein the light source group or the imaging group is arranged on a driving component, and the driving component drives the light source group or the imaging group to move along the direction. The lens stray light detection system as described in claim 1, wherein the light collecting cover is provided with an absorption part connected to the reflection part at the second group opening to form the light collecting space, the absorption part is composed of a light absorbing material, the reflection part is composed of a light reflecting material, the reflection part defines a first curvature corresponding to the light collecting space, the absorption part defines a second curvature corresponding to the light collecting space, and the first curvature of the reflection part is greater than the second curvature of the absorption part. As described in claim 9, the lens stray light detection system, wherein the light collecting cover is provided with a third group of ports corresponding to the first group of ports, the third group of ports penetrates the absorption part, and the lens to be tested is arranged at the third group of ports facing the reflection part of the light collecting cover.

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