TWM577496U - Micro distance les detection device - Google Patents

Abstract

A micro distance lens detection device, which is suitable for micro distance detection of a lens to be tested with a surface, and orderly includes a light source module, a diffuser, a pattern test card, a collimator unit and an image retrieval module, the lens is disposed between the pattern test card and the collimator unit, the micro distance between a surface of the lens to be tested and a luminous surface of the pattern test card is less than 25 mm, thereby, under the condition of micro-distance between the lens to be tested and the pattern test card, the modulation transfer function can be detected for the lens to be tested, so that the lens detection device requires less setup space.

Description

Micro-range lens detecting device

The present invention relates to a lens detecting device, and more particularly to a micro-range lens detecting device.

At present, the lens has been widely used in portable mobile devices, such as smart phones, digital cameras, and the like. In the manufacturing process, the lens quality is changed due to process differences. Therefore, the lens must be tested before leaving the factory to determine that the manufactured lens conforms to the original design specifications, such as the modulation transfer function (MTF). ) has been commonly used to evaluate the optical quality of a lens on the market today.

Referring to FIG. 1 , a lens detecting device generally used in the present invention is mainly composed of a light source module 11 , a pattern testing card 12 and an image capturing module 13 . The light emitted by the light source module 11 passes through the pattern test card 12 for providing a test pattern required for the lens 14 to be tested. The image to be tested 14 is placed at the test position, and the image formed by the test pattern 14 through the image to be tested 14 is acquired by the image capturing module 13 and transmitted to the host computer 15, and the captured image is analyzed by the host computer 15.

However, since the object distance and the image distance have a conjugate relationship, the farther the object distance is, the closer the image distance is. On the contrary, the closer the object distance is, the farther the image distance is. Therefore, the lens detecting device can only measure the object distance (ie, The distance between the surface of the lens under test 14 and the pattern test card 12 is detected between a specific range, which is between 320 mm and 500 mm, and the distance between the lens 14 to be tested and the pattern test card 12 is When the distance is smaller than the foregoing range, especially in the state of the distance of the object (that is, the distance between the surface of the lens 14 to be tested and the pattern test card 12 is less than 25 mm), the image capturing module 13 must be set relative to the waiting The measuring lens 13 is at infinity, thus causing a great demand for equipment space, which is disadvantageous for the setting of the detecting device.

The purpose of the present invention is to provide a micro-range lens detecting device, which requires a small installation space to detect a lens to be tested in a micro-distance manner.

In order to achieve the above objective, the present invention is a micro-range lens detecting device, which is suitable for detecting a lens to be tested having a surface by micro-distance, and the micro-range lens detecting device comprises a light source module and a diffusion arranged in sequence a film, a pattern test card, a collimator unit, and an image capture module, wherein:

The light source module provides a light; the diffusion sheet is disposed on the path of the light to make the light passing through more uniform; the pattern test card is disposed on the path of the uniform light and has a light-emitting surface, the light pattern of the test pattern required for the lens to be tested is generated by the light; the lens to be tested is disposed between the pattern test card and the collimator unit, and the surface of the lens to be tested is The micro-distance between the light-emitting surfaces of the pattern test card is less than 25 mm; the collimator unit is configured to receive the test pattern light pattern after passing the lens to be tested, and focus on the image capturing mode The imaging module is configured to receive the test pattern light image that is focused by the collimator unit.

The utility model has the advantages that: the light source module, the diffusion sheet, the pattern test card, the collimator unit and the image capturing module are sequentially arranged, so that the lens to be tested and the pattern test card are at a micro distance. Under the condition, the lens to be tested can be optically tuned to detect the modulation transfer function (MTF). Therefore, the space required for the lens detecting device is small. In addition, under the condition of the micro-distance between the lens to be tested and the pattern test card, the MTF can be correctly measured on the axis and the off-axis, and the lens to be tested is in the lens regardless of the focus plane. The MTF measurement can be performed inside the mechanism or outside the lens mechanism.

Preferably, the lens to be tested has a lens barrel and a plurality of lens groups disposed in the lens barrel, and the lens group generates a focusing plane which is located inside the lens barrel or outside the lens barrel.

Preferably, wherein the micro-distance is less than 10 mm.

Preferably, the test pattern of the pattern test card is a Bar Chart, an Edge Chart, or a Slit Chart.

Preferably, the collimator unit includes an image taking lens and a collimator for receiving the test pattern light pattern after passing through the lens to be tested, and the collimator is configured to receive the image. Taking the test pattern of the image lens and focusing on the image capturing module.

In addition, for the above purpose, the present invention is a micro-range lens detecting device, which is suitable for detecting a lens to be tested having a surface by micro-distance, and the micro-range lens detecting device comprises a light source module arranged in sequence. a filter, a pattern test card, a collimator unit, and an image capture module, wherein:

The light source module provides a light; the filter is disposed on the path of the light to filter out the specific wavelength light of the light; the pattern test card is disposed on the path of the filtered light And having a light-emitting surface, the light pattern of the test pattern required for the lens to be tested is generated by the light; the lens to be tested is disposed between the pattern test card and the collimator unit, and the lens to be tested The micro-distance between the surface and the light-emitting surface of the pattern test card is less than 25 mm; the collimator unit is configured to receive the test pattern after passing the lens to be tested, and focus on the The image capturing module is configured to receive the test pattern light image that is focused by the collimator unit.

The utility model has the advantages that: the light source module, the filter, the pattern test card, the collimator unit and the image capturing module are sequentially arranged, so that the distance between the lens to be tested and the pattern test card is at a micro distance Under the condition, the lens to be tested can be optically modulated and modulated (modulation transfer) The detection of the function, MTF), therefore, the setup space required for the lens detecting device is small. In addition, under the condition of the micro-distance between the lens to be tested and the pattern test card, the MTF can be correctly measured on the axis and the off-axis, and the lens to be tested is in the lens regardless of the focus plane. The MTF measurement can be performed inside the mechanism or outside the lens mechanism.

Preferably, the lens to be tested has a lens barrel and a plurality of lens groups disposed in the lens barrel, and the lens group generates a focusing plane which is located inside the lens barrel or outside the lens barrel.

Preferably, wherein the micro-distance is less than 10 mm.

Preferably, the test pattern of the pattern test card is a Bar Chart, an Edge Chart, or a Slit Chart.

Preferably, the collimator unit includes an image taking lens and a collimator, and the image capturing lens is configured to receive the test pattern light pattern after passing through the lens to be tested, and the collimator is configured to receive the passing image. The test pattern of the image taking lens is optically focused and focused on the image capturing module.

Referring to FIG. 2, a first embodiment of the present invention provides a micro-range lens detecting device, which is suitable for detecting a lens 20 to be tested having a surface 21 by using a micro-distance D, and the lens detecting device of the micro-distance includes A light source module 30, a diffusion sheet 40, a pattern test card 50, a collimator unit 60 and an image capturing module 70 are arranged in sequence, wherein:

The light source module 30 provides a light.

The diffusion sheet 40 is disposed on the path of the light to make the light passing through more uniform; accordingly, the light emitted by the light source module 30 is more uniform after passing through the diffusion sheet 40, thereby improving the accuracy of the final measurement. .

The pattern test card 50 is disposed on the path of the uniform light, and has a light-emitting surface 51, and the light pattern of the test pattern required for the lens 20 to be tested is generated by the light; in this embodiment, the pattern The test pattern of the test card 50 is a Bar Chart, but not limited thereto, and may be an Edge Chart or a Slit Chart. It should be noted that the test pattern of the pattern test card 50 may change depending on the optical characteristics to be detected by the lens 20 to be tested, and the pattern test card 50 may also be presented in a raster manner.

The lens 20 to be tested is disposed between the pattern test card 50 and the collimator unit 60, and the micro-distance D is between the surface 21 of the lens 20 to be tested and the light-emitting surface 51 of the pattern test card 50. The micro-distance D is 25 mm, but not limited thereto, and the micro-distance D is less than 25 mm, for example, less than 10 mm, 5 mm, 6 mm, 7 mm, and 8 mm. PCT, 9 mm, etc. are acceptable. In this embodiment, the lens 20 to be tested has a lens barrel 22 and a plurality of lens groups 23 disposed in the lens barrel 22. The lens group 23 is composed of a plurality of lenses and generates a focusing plane 231. The plane 231 is located inside the lens barrel 22.

The collimator unit 60 is configured to receive the test pattern after passing through the lens 20 to be tested, and focus on the image capturing module 70. In the embodiment, the collimator unit 60 includes an image capturing lens. 61 and a collimator 62, the image capturing lens 61 is configured to receive the test pattern light pattern after passing through the lens 20 to be tested, and the collimator 62 is configured to receive the test pattern light pattern passing through the image capturing lens 61. And focusing on the image capturing module 70, the collimator 62 simulates an infinite distance between the lens 20 to be tested and the image capturing module 70.

The image capturing module 70 is configured to receive the test pattern light type that the collimator unit 60 focuses on.

Accordingly, the light source module 30, the diffusion sheet 40, the pattern test card 50, the collimator unit 60, and the image capturing module 70 are sequentially disposed between the lens 20 to be tested and the pattern test card 50. Under the condition of the micro-distance D, the lens 20 to be tested can be optically tuned to detect the modulation transfer function (MTF). Therefore, the space required for the lens detecting device is small. The test pattern light generated by the pattern test card 50 passes through the to-be-tested lens 20 because the surface 21 of the to-be-tested lens 20 and the light-emitting surface 51 of the pattern test card 50 are at a micro-distance of 25 mm. After that, the test pattern light pattern is generated at the corresponding focus of the image plane of the lens 20 to be tested (ie, the focus plane 231), and the test pattern of the lens 20 to be tested by the collimator unit 60 is adopted by the collimator unit 60. After the light type (ie, imaging) is received, it is projected to the image capturing module 70, and then an infinite distance is simulated between the lens 20 to be tested and the image capturing module 70. Finally, the image capturing module 70 can be coupled. Connected to a host (not shown), the host can obtain the corresponding optical characteristic value, such as MTF, by using the image of the test pattern.

In addition, under the condition of the micro-distance D between the to-be-tested lens 20 and the pattern test card 50, the MTF can be accurately measured on the on-axis and off-axis, and the image capture module is on the axis. The image center point of 70, and the off-axis is the other position of the image of the image capturing module 70.

In addition, referring to FIG. 3, a second embodiment of the present invention provides a micro-range lens detecting device, which is also suitable for detecting the lens 20 to be tested by a micro-distance D. The lens detecting device of the micro-range also includes sequentially setting The light source module 30, the diffusion sheet 40, the pattern test card 50, the collimator unit 60, and the image capturing module 70 are different in:

The focal plane 231 of the lens 20 to be tested is located outside the lens barrel 22. Accordingly, the LFT 20 to be tested can perform MTF measurement regardless of whether the focus plane 231 is inside the lens mechanism or outside the lens mechanism.

It should be noted that, in another implementation state, please refer to FIG. 2 at the same time, the micro-range lens detecting device includes the light source module 30, the filter 80, the pattern test card 50, and the collimator which are sequentially disposed. The unit 60 and the image capturing module 70 are replaced with the filter 80. The difference is that the filter 80 is disposed on the path of the light provided by the light source module 30. Filter out the specific wavelength of light of the light. The collimator unit 60 will vary with the filter 80, particularly the image taking lens 61. The pattern test card 50 is disposed on the path of the filtered light and has a light-emitting surface 51, and the light pattern of the test pattern required for the lens 20 to be tested is generated by the light.

[知知]

11‧‧‧Light source module

12‧‧‧ pattern test card

13‧‧‧Image capture module

14‧‧‧Test lens

15‧‧‧Host

[This new type]

D‧‧‧Micro Distance

20‧‧‧Densor to be tested

21‧‧‧ surface

22‧‧‧Mirror tube

23‧‧‧ lens group

231‧‧‧Focus plane

30‧‧‧Light source module

40‧‧‧Diffuser

50‧‧‧ pattern test card

51‧‧‧Glossy surface

60‧‧‧ collimator unit

61‧‧‧Image lens

62‧‧ ‧collimator

70‧‧‧Image capture module

80‧‧‧Filter

1 is a schematic view of a conventional lens detecting device; FIG. 2 is a schematic view of a first embodiment of the present invention; and FIG. 3 is a schematic view of a second embodiment of the present invention.

Claims (10)

A micro-range lens detecting device is suitable for detecting a lens to be tested having a surface by micro-distance, the micro-range lens detecting device comprises a light source module, a diffusion sheet, a pattern test card, and a sequentially arranged a collimator unit and an image capturing module, wherein: the light source module provides a light; the diffuser is disposed on the path of the light to make the light passing through more uniform; the pattern test card is set And a light-emitting surface is formed on the path of the uniform light, and the light pattern of the test pattern required for the lens to be tested is generated by the light; the lens to be tested is set on the pattern test card and the collimator Between the units, and the micro-distance between the surface of the lens to be tested and the light-emitting surface of the pattern test card, the micro-distance is less than 25 mm; the collimator unit is configured to receive the lens after passing through the lens to be tested The test pattern is optically focused and focused on the image capturing module; the image capturing module is configured to receive the test pattern light image that is focused by the collimator unit. The lens detecting device of the micro-range of claim 1, wherein the lens to be tested has a lens barrel and a plurality of lens groups disposed in the lens barrel, the lens group generates a focusing plane, and the focusing plane is located in the lens barrel Internal or external to the barrel. The micro-lens lens detecting device of claim 1, wherein the micro-distance is less than 10 mm. The micro-range lens detecting device of claim 1, wherein the test pattern of the pattern test card is a Bar Chart, an Edge Chart, or a Slit Chart. The lens detecting device of the micro-range of claim 1, wherein the collimator unit comprises an image capturing lens and a collimator for receiving the test pattern after passing the lens to be tested The collimator is configured to receive the test pattern light pattern passing through the image taking lens and focus on the image capturing module. A micro-range lens detecting device is adapted to detect a lens to be tested having a surface by micro-distance, and the micro-range lens detecting device comprises a light source module, a filter, a pattern test card, and a collimator unit and an image capturing module, wherein: the light source module provides a light; the filter is disposed on the path of the light to filter out light of a specific wavelength of the light; the pattern test The card is disposed on the path of the filtered light and has a light emitting surface, wherein the light pattern of the test pattern required for the lens to be tested is generated; the lens to be tested is set on the pattern test card and Between the collimator units, and the micro-distance between the surface of the lens to be tested and the light-emitting surface of the pattern test card, the micro-distance is less than 25 mm; the collimator unit is configured to receive the The test pattern light pattern after the lens is measured and focused on the image capturing module; the image capturing module is configured to receive the test pattern light type focused by the collimator unit. The lens detecting device of the micro-range of claim 6, wherein the lens to be tested has a lens barrel and a plurality of lens groups disposed in the lens barrel, the lens group generates a focusing plane, and the focusing plane is located in the lens barrel Internal or external to the barrel. The micro-lens lens detecting device of claim 6, wherein the micro-distance is less than 10 mm. The micro-range lens detecting device of claim 6, wherein the test pattern of the pattern test card is a Bar Chart, an Edge Chart, or a Slit Chart. The lens detecting device of the micro-range of claim 6, wherein the collimator unit comprises a collimator and an image taking lens, and the image capturing lens is configured to receive the test after passing the lens to be tested In the pattern light type, the collimator is configured to receive the test pattern light pattern passing through the image capturing lens and focus on the image capturing module.