CN215581493U

CN215581493U - Lens detection device

Info

Publication number: CN215581493U
Application number: CN202121287467.0U
Authority: CN
Inventors: 蓝伟友
Original assignee: Yirui Industrial Co ltd
Current assignee: Yirui Industrial Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-01-18
Anticipated expiration: 2031-06-09

Abstract

The utility model provides a lens detection device which mainly comprises a carrying platform, a light emitting unit, a plurality of first light sensing units and a plurality of second light sensing units. The carrier is used for placing a lens to be tested and is provided with a first surface and a second surface, wherein the first surface and the second surface are two opposite surfaces. The light-emitting unit is located on the second surface side of the carrying platform and used for projecting a detection light beam to the lens to be detected. The first light sensing unit and the second light sensing unit are positioned on the first surface side of the carrying platform and used for receiving a detection light beam passing through the lens to be detected. A first distance is formed between the first light sensing unit and the carrying platform, a second distance is formed between the second light sensing unit and the carrying platform, and the first distance is smaller than the second distance.

Description

Lens detection device

Technical Field

The utility model relates to a lens detection device which is used for detecting the quality of a lens to be detected and whether the lens to be detected is polluted by particles.

Background

With the development of technology, the requirements of many industries on the specifications of optical lenses are becoming more and more stringent, and as the size of the lenses becomes smaller, the conventional lens inspection method and apparatus also gradually encounter some bottlenecks.

In the conventional lens inspection method, for example, a pattern generating device of the lens inspection apparatus provides a pattern light spot and emits a pattern light beam on an imaging surface of a lens to be inspected, and further, the lens to be inspected provides the light beam to an image sensor (e.g., a camera) to enable the image sensor to obtain an image, which can be further analyzed to inspect the quality (e.g., resolution, contrast) of the lens.

In addition, there is also a detection method in which a plurality of image sensors are disposed around the lens to be detected to receive light beams of different angles output by the lens to be detected and detect imaging qualities of different viewing angles. However, there is also a need to detect the imaging quality of the lens to be measured at different focal lengths.

In addition, when testing lenses to be tested with different focal lengths, the image sensors of the detection system need to be disposed at different distances from the lens to be tested due to the different focal lengths, and the image sensors of both the near and far sides cannot be shared and must be additionally changed in position, or different testing machines need to be used, so that the testing is inconvenient to perform.

Furthermore, there is a zoom lens composed of a plurality of lenses, which is inconvenient to be tested by the conventional testing method and machine because the focus of the lens can be changed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the drawbacks of the prior art, the present invention provides a novel lens detecting device, which mainly includes a plurality of first photo sensing units disposed closer to a carrier, and a plurality of second photo sensing units disposed farther from the carrier. The configuration combination can be used for detecting by configuring the first light sensing unit which is relatively close when the lens to be detected with short focus is tested, and for detecting by configuring the second light sensing unit which is relatively far when the lens to be detected with long focus is tested, and the short focus and long focus detection functions are simultaneously realized. Even if the variable-focus lens to be tested is tested, the variable-focus lens to be tested can be detected by the first light sensing unit and the second light sensing unit respectively.

An objective of the present invention is to provide a lens detecting device, which mainly includes a carrier, a light emitting unit, a plurality of first photo sensing units and a plurality of second photo sensing units. The carrier is used for placing at least one lens to be tested, wherein the light-emitting unit is positioned at the light incident side of the lens to be tested and used for projecting a detection light beam to the light incident side of the lens to be tested. Each first light sensing unit and each second light sensing unit are located on the light emitting side of the lens to be detected and used for receiving the detection light beam penetrating through the lens to be detected, wherein the distance between the lenses to be detected of the first light sensing units is smaller than the distance between the second light sensing units and the lenses to be detected.

With the structure, the first light sensing unit can be used for detecting the short-focus lens to be detected, and the second light sensing unit can be used for detecting the long-focus lens to be detected, so that the lens detection device has short-focus and long-focus detection functions at the same time, and the convenience and the efficiency for detecting the lenses to be detected with different focuses are improved.

An objective of the present invention is to provide the lens detecting device, which includes a first fixing frame for disposing the first sensing units, and a second fixing frame for disposing the second sensing units, wherein the first fixing frame is located between the second fixing frame and the carrier.

In the lens detecting device, the first fixing frame may have a through hole for each second light sensing unit to receive the detecting light beam passing through the lens to be detected through the through hole.

The lens detection device comprises a cover body arranged on the first fixing frame and covering the through hole, wherein the at least one first light sensing unit is arranged on the cover body and can be arranged on the first fixing frame together with the cover body or be detached from the first fixing frame.

Another objective of the present invention is to provide the lens detecting device as described above, wherein the first fixing frame may include a plurality of first guiding units, and each of the first light sensing units is disposed on and displaced along the first guiding unit to change an angle of each of the first light sensing units relative to the lens to be detected.

As another example, in the lens detecting apparatus, the second fixing frame may further include a plurality of second guiding units, and each second light sensing unit is mounted on the second fixing frame and moves along the second guiding unit to adjust an angle of the second light sensing unit relative to the lens to be detected.

In the lens detecting device, each of the first photo sensing units is disposed with a first distance from the lens to be detected on the carrier. Each second optical sensing unit is arranged by taking the lens to be detected on the carrying platform as the center and separating a second distance. And a first included angle is formed between the two opposite first light sensing units positioned on the outermost side and the lens to be detected on the carrying platform, a second included angle is formed between the two opposite second light sensing units positioned on the outermost side and the lens to be detected on the carrying platform, and the first included angle is larger than the second included angle.

Another objective of the present invention is to provide the lens inspection device as described above, which can include a test pattern located between the carrier and the light-emitting unit, wherein the inspection light beam emitted by the light-emitting unit is projected onto the lens to be inspected through the test pattern. Thus, patterns can be added for each photo sensing unit to detect the imaging quality.

In addition, the lens detection device further includes a driving unit connected to the test pattern for driving the test pattern to move relative to the stage.

Still another objective of the present invention is to provide the lens detecting device as described above, which includes a driving unit connected to the carrier, the carrier includes a plurality of placing holes for placing a plurality of lenses to be detected respectively, and the driving unit is used for driving the carrier to move relative to the light emitting unit. The carrying platform can be used for placing a plurality of lenses to be detected, and the carrying platform is moved by the driving unit, so that the first light sensing unit and the second light sensing unit can detect different lenses to be detected.

Drawings

Fig. 1 is a schematic structural diagram of short-focus lens inspection according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a telephoto lens under test according to an embodiment of the lens inspection apparatus of the present invention.

Fig. 3 is a side view of a specific structure of a lens inspection apparatus according to an embodiment of the present invention.

Fig. 4 is a partial perspective view of a first fixing frame of a lens inspection device according to an embodiment of the utility model.

Fig. 5 is a partial perspective view of a first fixing frame of a lens detecting apparatus according to an embodiment of the utility model in a disassembled state.

Description of reference numerals: 10. 100-lens detection means; 11. 11 a-a stage; 111-a first surface; 112-a second surface; 113-placing holes; 12-a light emitting unit; 13-a first light sensing unit; 14-a second light sensing unit; 15-test pattern; 151-reticle design; 152-a light-transmitting panel; 21-a first fixing frame; 211-stand; 212-a via; 213-a first boot unit; 214-a slide rail; 215-a slider; 216-bolt; 22-a second mount; 221-a second guidance unit; 222-a slide rail; 223-a slider; 224-bolt; 23-a base; 231-a seat body; 232-connecting frame; 24-a housing; 25-a first drive unit; 26-a second drive unit; 3-a lens to be detected; d1 — first distance; d2 — second distance; l-a detection beam; x, Y, Z-direction; θ 1-a first included angle; θ 2-second angle.

Detailed Description

Please refer to fig. 1 and fig. 2, which are schematic structural diagrams of short-focus and long-focus lens inspection according to an embodiment of the lens inspection apparatus of the present invention. The lens detecting apparatus 10 of the present invention is used for detecting at least one lens 3 to be detected, and mainly includes a carrier 11, a light emitting unit 12, a plurality of first light sensing units 13, a plurality of second light sensing units 14, and a test chart 15.

The lens 3 to be measured may include an outer frame and at least one lens fixed in the outer frame, wherein the lens may be a short-focus convex lens, a long-focus convex lens, a concave lens, or even a spherical lens or a polygonal lens, and may be applied to a camera, a mobile phone, a tablet, or a pen. The focus range of the lens 3 to be measured, for example, of a short focus type, may be 1 millimeter (mm) depending on the thickness, surface curvature, and/or relative position of the lens, etc

5mm and the focal length of the telephoto type lens 3 to be measured may be 9mm to 30 mm. In addition, the zoom type lens 3 includes a plurality of different types of lenses, and the focal length can be changed by adjusting the relative position between the lenses.

The carrier 11 is substantially plate-shaped and has a first surface 111 and a second surface 112 opposite to each other, for example, the first surface 111 is an upper surface, and the second surface 112 is a lower surface. In an embodiment of the utility model, the stage 11 may be provided with at least one placing hole 113, wherein the placing hole 113 penetrates from the first surface 111 to the second surface 112 and is used for placing and positioning the lens 3 to be measured. In addition, the lens 3 to be measured may be positioned in the placement hole 113 by fitting or screwing, and the like.

The light emitting unit 12 is disposed on the second surface 112 side of the carrier 11 for generating a detection light beam L. The light emitting unit 12 itself may be a light emitting diode or a bulb, etc., to emit scattered light. In addition, based on different installation considerations or detection requirements, the detection light beam L of the light emitting unit 12 may also be redirected by at least one reflector (not shown) for further derivation.

The test pattern 15 of the present embodiment is disposed between the stage 11 and the light emitting unit 12, and includes a plurality of reticle patterns 151 and a transparent plate 152, wherein the reticle patterns 151 are disposed on the transparent plate 152. In one embodiment of the present invention, the reticle pattern 151 may include two "+" patterns on the left and right, and one "+" pattern in the center, and is black or dark. When the detection light beam L emitted by the light emitting unit 12 irradiates the test pattern 15, a portion of the detection light beam L passes through the transparent plate 152, and a portion of the detection light beam L is blocked by the reticle pattern 151 to form a pattern light beam, and is projected to the lens 3 to be tested.

Although the reticle pattern 151 of the test pattern 15 is "+" or "+", it is understood that the reticle pattern may be radial stripes, circular rings, polygons, or even letters, and the scope of the right of the lens inspection device of the present invention is not limited thereto.

Each first photo sensing unit 13 is disposed on the first surface 111 side of the carrier 11 and is configured to receive the detection light beam L passing through the lens 3 to be detected. In addition, each second photo sensing unit 14 is also disposed on the first surface 111 side of the stage 11 and is configured to receive the detection light beam L passing through the lens 3 to be detected. A first distance D1 is separated between each first photo sensing unit 13 and the carrier 11, and a second distance D2 is separated between each second photo sensing unit 14 and the carrier 11, wherein the second distance D2 is greater than the first distance D1, for example, the second distance D2 is preferably 1.2 to 3 times of the first distance D1, but not limited thereto. In addition, the difference between the multiples of the second photo sensing unit 14 and the first photo sensing unit 13 may be 1.5x to 5 x.

Each first photo sensing unit 13 is disposed on a partial spherical surface of a virtual sphere formed by taking the lens 3 to be measured on the stage 11 as a spherical center (center) and taking the first distance D1 as a radius. In addition, each second photo sensing unit 14 is disposed on a partial spherical surface of a virtual sphere formed by taking the lens 3 to be measured on the stage 11 as a spherical center (center) and taking the second distance D2 as a radius.

Generally, the first photo sensing units 13 are distributed in an area smaller than that of the second photo sensing units 14. Specifically, a first included angle θ 1 is formed between the two opposite first photo sensing units 13 located on the outermost side and the lens 3 to be measured, and a second included angle θ 2 is formed between the two opposite second photo sensing units 14 located on the outermost side and the lens 3 to be measured, where the first included angle θ 1 is greater than the second included angle θ 2.

Furthermore, each of the

photo sensing units

13 and 14 may be matched with an aperture (not shown) to adjust the light entrance aperture, so as to adapt to the imaging output by the lens 3 to be tested with different focal lengths and/or the test pattern 15 with different distances. In addition, each of the

light sensing units

13 and 14 may include a charge-coupled device (CCD) and/or a complementary metal oxide semiconductor Active pixel sensor (CMOS Active pixel sensor).

When the lens inspection apparatus 10 of the present invention is used to inspect the imaging quality of the short-focus lens 3 to be inspected, as shown in fig. 1, the light emitting unit 12 can project the inspection light beam L to the lens 3 to be inspected through each reticle pattern 151 of the test pattern 15, and receive the inspection light beam L passing through the lens 3 to be inspected through each first photo sensing unit 13. For example, the left and right two or peripheral first photo sensing units 13 may be used to receive the images of the left and right or peripheral reticle patterns 151(+), and the central first photo sensing unit 13 is used to receive the images of the central reticle patterns 151(+ +) to detect the imaging quality and integrity of the lens 3 under test at various angles (viewing angles), and whether there is a dirt adhesion or defect. Of course, the first photo sensing units 13 may detect the same reticle pattern 151.

When the lens inspection apparatus 10 of the present invention is used to inspect the imaging quality of the telephoto lens under test 3, as shown in fig. 2, the first photo sensing unit 13 disposed at the center may be removed. Thus, the light emitting unit 12 can project the detection light beam L to the lens 3 to be tested through the reticle patterns 151 of the test chart 15, wherein the detection light beam L passes through the position vacated by the central first photo sensing unit 13 and is received by the second photo sensing units 14. The manner of detecting the lens 3 to be detected by the second light sensing unit 14 is similar to that of the first light sensing unit 13, and therefore, the description thereof will not be repeated. In addition, the lens detection device 10 of the present invention can also be used to detect the variable-focus lens 3 to be detected.

Referring to fig. 3, a side view of a specific structure of a lens inspection apparatus according to an embodiment of the utility model is shown. The lens detecting device 100 of the present embodiment further includes a base 23, a first fixing frame 21, a cover 24, a second fixing frame 22, a first driving unit 25 and a second driving unit 26 in addition to the components of the lens detecting device 10. In addition, the stage 11a of the present embodiment has a plurality of placing holes 113 (see fig. 1) for placing a plurality of lenses 3 to be tested.

The base 23 includes a base 231 and a plurality of connecting frames 232. The base 231 is used for installing the carrier 11a, and each connecting frame 232 is installed on the base 231. The first driving unit 25 and the second driving unit 26 may be movable mechanisms such as a rotary motor and a lead screw, or a linear motor. The first driving unit 25 is disposed on the base 231 and connected to the stage 11a, for driving the stage 11a to move on the base 231 relative to the light emitting unit 12, for example, the stage 11a can be driven to move in the mutually perpendicular X direction and Y direction (horizontal direction in fig. 3).

On the other hand, the second driving unit 26 is disposed on the other side of the base 231 relative to the first driving unit 25, connects the light emitting unit 12 and the test pattern 15, and is used for driving the test pattern 15 and/or the light emitting unit 12 to shift along the Z direction relative to the stage 11a, such as the up-down direction in fig. 3, where the Z direction is orthogonal to the X direction and the Y direction. The relative positions of the lens 3 to be tested, the test chart 15 and/or the light emitting unit 12 can be adjusted by the first driving unit 25 and the second driving unit 26, so that each of the

light sensing units

13 and 14 can receive images with proper positions and sizes. In another embodiment, the first driving unit 25, the stage 11a, the light emitting unit 12, the test pattern 15, and the second driving unit 26 may be disposed on the same side of the base 23 along the installation space.

Referring to fig. 4 and 5, the first fixing frame 21 is connected to the connecting frames 232 and is used for installing the first light sensing unit 13. In an embodiment of the present invention, the first fixing frame 21 includes a frame 211 and a plurality of first guiding units 213, wherein the frame 211 is connected to the connecting frame 232 and has a through hole 212, for example, the through hole 212 may be disposed in a central region of the frame 211.

Each first guiding unit 213 is linked to a surface of stage 211 facing stage 11a, and first sensing unit 13 is disposed on first guiding unit 213. Specifically, each first guiding unit 213 may be provided with a sliding rail 214, and includes a sliding block 215 and a bolt 216.

Each of the first guide units 213 and/or the slide rail 214 may have an arc shape and be disposed along a spherical surface of a virtual sphere having the lens 3 to be measured on the stage 11a as a center and the first distance D1 as a radius. The sliding block 215 is mounted on the sliding rail 214 and can move along the sliding rail 214, and the first light sensing unit 13 is connected to the sliding block 215 to move along the first guiding unit 213, so as to adjust the relative angle between the first light sensing unit 13 and the lens 3 to be measured on the carrying stage 11 a. The bolt 216 is screwed on the sliding block 215 and can adjust the tightness of the screw, so that when the first photo sensing unit 13 and the sliding block 215 move to a proper angle position, the bolt 216 can be locked and clamped with the sliding block 215 on the wall surfaces on the two sides of the sliding rail 214 to position the first photo sensing unit 13. In addition, according to different requirements, a plurality of first photo sensing units 13 may be disposed on one first guiding unit 213.

As shown in fig. 4, the cover 24 may be disposed on the stand 211 of the first fixing frame 21 and covers the through hole 212, wherein the at least one first photo-sensing unit 13 is disposed on the side of the cover 24 facing the carrier 11a, and may be mounted on the stand 211 together with the cover 24 or detached. The cover 24 may be coupled to the through hole 212 of the stand 211 by, for example, engagement, elastic engagement, or screwing, so that the cover 24 can be easily attached to or detached from the through hole 212. In addition, the first optical sensing unit 13 disposed on the cover 24 is located at the center of the other first optical sensing units 13, and can be aligned with the stage 11a and the lens 3 to be measured, and a pivot mechanism can be further disposed to adjust the angular orientation according to different requirements.

As shown in fig. 3, the second fixing frame 22 is connected to each connecting frame 232 of the base 23 and supported by each connecting frame 232 for disposing each second photo sensing unit 14, wherein the first fixing frame 21 is located between the second fixing frame 22 and the carrier 11 a. In addition, as shown in fig. 4, the second fixing frame 22 is provided with a plurality of second guiding units 221 for each second photo sensing unit 14 to be installed, and the second guiding units 221 and the first guiding units 213 are also configured by adding bolts 224 through the structures of the sliding rails 222 and the sliding blocks 223, so that the second photo sensing units 14 can be displaced along the second guiding units 221 by using the lens 3 to be measured on the carrying platform 11a as the center of sphere and using the second distance D2 as the radius to form a virtual spherical surface, and adjust the angle and position relative to the lens 3 to be measured. Of course, in response to different requirements, a plurality of second photo sensing units 14 may be disposed on one second guiding unit 221.

With such a structure, when the lens detecting apparatus 100 of the present invention detects the imaging quality of the short-focus lens 3 to be detected on the stage 11a, the stage 11a is moved by the first driving unit 25, so that the short-focus lens 3 to be detected can be aligned with the detection light beam L emitted by the light emitting unit 12, the test chart 15 is moved to a proper imaging position by the second driving unit 26, and the first guiding units 213 are used to adjust and move the first light sensing units 13 to a proper orientation relative to the lens 3 to be detected. Then, the detection light beam L of the light emitting unit 12 passes through the test pattern 15 and is projected to the lens 3 to be detected, and is received and detected by each of the first photo sensing units 13.

When the lens detecting apparatus 100 of the present invention detects the imaging quality of the telephoto lens under test 3 on the stage 11a, the stage 11a is moved by the first driving unit 25, so that the lens under test 3 is aligned with the detecting light beam L of the light emitting unit 12. Next, the cover 24 on the mount 211 of the first fixing frame 21 is removed from the state shown in fig. 4, and the through hole 212 is exposed as shown in fig. 5. The test chart 15 is also moved to a suitable imaging position by the second driving unit 26, and the second light sensing units 14 are adjusted to be moved to a suitable orientation by the second guiding units 221. Then, the detection light beam L of the light emitting unit 12 passes through the test pattern 15 and is projected to the lens 3 to be tested, wherein the detection light beam L passes through the through hole 212 of the first fixing frame 21 and is received by each of the second photo sensing units 14 for detection.

In addition, if the variable-focus lens 3 to be detected is detected, the first light sensing unit 13 is also used for detecting in the short-focus range, and the cover body 24 and the first light sensing unit 13 positioned in the center are removed and the second light sensing unit 14 is used for detecting in the long-focus range, so that the long-focus and short-

focus sensing units

13 and 14 can be conveniently matched with the focus change of the lens 3 to be detected. Therefore, the lens inspection apparatus 100 has the inspection function of the short-focus and long-focus lens 3 to be inspected at the same time, and the convenience of lens inspection can be effectively improved.

In summary, in the lens detecting apparatus of the present invention, the first photo sensing units 13 disposed at the first distance D1 from the carrier 11 and the second photo sensing units 14 disposed at the second distance D2 from the carrier 11 are used to project the detection light beam L of the light emitting unit 12 to the lens 3 to be detected through the test chart 15 when the imaging quality of the lens 3 to be detected with short focus is to be detected, and then the detection light beam L is received and detected by the first photo sensing units 13. When the imaging quality of the long-focus lens 3 to be detected is to be detected, the central first photo sensing unit 13 can be removed, so that the detection light beam L projected to the lens 3 to be detected can be received and detected by the second photo sensing units 14, and the short-focus and long-focus detection functions are provided, so as to effectively improve the convenience of detection.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, i.e., all equivalent variations and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.

Claims

1. A lens inspection apparatus, comprising:

the microscope comprises a carrier, a lens, a first lens, a second lens, a first lens and a second lens, wherein the carrier is used for placing at least one lens to be measured and is provided with a first surface and a second surface, and the first surface and the second surface are two opposite surfaces;

a light emitting unit, located on the second surface side of the carrier, for projecting a detection light beam to the lens to be detected;

the plurality of first light sensing units are positioned on the first surface side of the carrying platform and used for receiving the detection light beam passing through the lens to be detected; and

the plurality of second light sensing units are positioned on the first surface side of the carrying platform and used for receiving the detection light beam passing through the lens to be detected, wherein a first distance is formed between the plurality of first light sensing units and the carrying platform, a second distance is formed between the plurality of second light sensing units and the carrying platform, and the first distance is smaller than the second distance.

2. The lens detection apparatus according to claim 1, comprising:

the first fixing frame is used for arranging the plurality of first light sensing units; and

the second fixing frame is used for arranging the plurality of second light sensing units, wherein the first fixing frame is positioned between the second fixing frame and the carrying platform.

3. The lens detection apparatus as claimed in claim 2, wherein the first fixing frame is provided with a through hole, and the second light sensing unit receives the detection light beam passing through the lens to be detected through the through hole.

4. The lens detecting device of claim 3, comprising a cover disposed on the first fixing frame and covering the through hole, wherein at least one of the plurality of first light sensing units is disposed on the cover.

5. The lens detecting device of claim 2, wherein the first fixing frame includes a plurality of first guiding units, and the plurality of first light sensing units are mounted on the plurality of first guiding units and displaced along the plurality of first guiding units to adjust an angle of the first light sensing units relative to the lens to be detected.

6. The apparatus according to claim 5, wherein the second fixing frame includes a plurality of second guiding units, and the plurality of second light sensing units are mounted on the plurality of second guiding units and move along the plurality of second guiding units to adjust an angle of the second light sensing units relative to the lens to be tested.

7. The lens detection apparatus according to claim 1, wherein the plurality of first photo sensing units are disposed at the first distance with the lens to be detected on the stage as a center; the plurality of second light sensing units are arranged by taking the lens to be detected on the carrying platform as a center and separating the second distance; and a first included angle is formed between the two opposite first light sensing units positioned on the outermost side and the lens to be detected, a second included angle is formed between the two opposite second light sensing units positioned on the outermost side and the lens to be detected, and the first included angle is larger than the second included angle.

8. The lens inspection device of claim 1, comprising a test pattern located between the stage and the light emitting unit, wherein the inspection beam emitted by the light emitting unit passes through the test pattern and is projected onto the lens to be inspected.

9. The apparatus as claimed in claim 8, comprising a driving unit connected to the test pattern, wherein the driving unit is configured to drive the test pattern to move relative to the lens to be tested on the stage.

10. The lens inspection device as claimed in claim 1, comprising a driving unit connected to the stage, wherein the stage comprises a plurality of positioning holes for positioning a plurality of lenses to be inspected, and the driving unit is configured to drive the stage to move relative to the light emitting unit.