CN220187981U

CN220187981U - Optical detection device

Info

Publication number: CN220187981U
Application number: CN202321377124.2U
Authority: CN
Inventors: 蓝伟友; 陈俊贤
Original assignee: Yirui Industrial Co ltd
Current assignee: Yirui Industrial Co ltd
Priority date: 2022-10-05
Filing date: 2023-06-01
Publication date: 2023-12-15
Anticipated expiration: 2033-06-01
Also published as: TWM637206U

Abstract

The utility model discloses an optical detection device for detecting performance parameters of a lens to be detected. The optical detection device comprises a camera, a driving motor and a connecting piece. The camera includes a body and an objective lens. The objective lens comprises a lens cone and a focal length adjusting ring, wherein the lens cone is arranged on the machine body, and the focal length adjusting ring is rotatably arranged on the lens cone. The driving motor comprises a power assembly and a rotating shaft, wherein the rotating shaft is rotatably arranged on the power assembly, and the power assembly is used for providing driving force to enable the rotating shaft to rotate. Opposite ends of the connecting piece are respectively connected with the rotating shaft and the focus adjusting ring. The driving motor is used for driving the focal length adjusting ring to rotate by rotating the connecting piece through the rotating shaft, so as to adjust the focal length of the objective lens.

Description

Optical detection device

Technical Field

The present utility model relates to an optical inspection device, and more particularly to a multi-object-distance optical inspection device.

Background

Because the quality of the lens is changed due to the process difference in the manufacturing process, the lens assembled by the lens is detected before leaving the factory to determine that the manufactured lens meets the original design specification. In addition, as the lens pixels become higher, how to accurately evaluate the performance of the lens is also an important issue in this field. Generally, the resolving power of a lens is the ability of the lens to reproduce details of a photographed scene, which can be used as an important pointer for evaluating the performance of the lens, wherein the higher the resolving power of the lens, the clearer the image.

The existing test methods for measuring the resolving power of the lens include modulation transfer function (Modulation Transfer Function, MTF) and contrast transfer function (Contrast Transfer Function, CTF), and most of these test methods fix the focal length of the objective lens of the detection device at infinity or a finite distance, so that only the value of the resolving power of the lens to be measured at a single object distance position (i.e. infinity or finite distance) can be measured. However, the present lens is more and more widely used and diversified, and the same lens may be used for photographing a scene with a limited distance and infinity, so there is a need to measure resolving power of the lens with two different object distances, i.e. infinity and a limited distance. However, the conventional method for testing the focal length position of the fixed objective lens cannot simultaneously measure the resolution values of the lens to be tested at two different object distances, namely infinity and a finite distance, in a single test procedure by a single testing device. That is, if two resolving power values of a lens at infinity and a finite distance are to be measured, only two different detecting devices can be used to detect the resolving power values of the lens at infinity and the finite distance respectively, or the focal lengths of the detecting devices are manually switched in two different testing procedures respectively to detect the resolving power values of the lens at infinity and the finite distance.

Disclosure of Invention

The present utility model provides an optical inspection device, which solves the problem that the prior art cannot simultaneously measure the resolution value of the lens to be inspected at infinity and a finite distance in a single test procedure by a single inspection device.

The optical detection device disclosed by one embodiment of the utility model is used for detecting the performance parameter of a lens to be detected. The optical detection device comprises a camera, a driving motor and a connecting piece. The camera comprises a body and an objective lens. The objective lens comprises a lens cone and a focal length adjusting ring, wherein the lens cone is arranged on the machine body, and the focal length adjusting ring is rotatably arranged on the lens cone. The driving motor comprises a power assembly and a rotating shaft, wherein the rotating shaft is rotatably arranged on the power assembly, and the power assembly is used for providing driving force to enable the rotating shaft to rotate. Opposite ends of the connecting piece are respectively connected with the rotating shaft and the focus adjusting ring. The driving motor is used for driving the focal length adjusting ring to rotate by rotating the connecting piece through the rotating shaft, so that the focal length of the objective lens is adjusted.

According to the optical detection device disclosed in the above embodiment, the driving motor automatically drives the connecting piece to rotate the focal length adjusting ring of the objective lens to adjust the focal length of the objective lens, so that the focal length of the objective lens is not required to be manually switched, and the operation time required by manually switching the focal length is saved, so that the resolving power value of the lens to be detected at infinity and the resolving power value of the lens to be detected at a finite distance can be measured by using a single optical detection device in a single test procedure. Thus, the multi-object distance lens detection can be more effectively completed.

The foregoing description of the utility model and the following description of embodiments are provided to illustrate and explain the principles of the utility model and to provide further explanation of the utility model as claimed.

Drawings

Fig. 1 is a schematic perspective view of an optical detection device according to an embodiment of the present utility model.

FIG. 2 is a schematic perspective view of the optical inspection device of FIG. 1, wherein the driving motor drives the connecting member to rotate the focus adjusting ring to a second position.

FIG. 3 is a perspective view of the connector of FIG. 1.

FIG. 4 is a schematic side view of the optical inspection device of FIG. 1 inspecting a lens under inspection at infinity.

FIG. 5 is a schematic side view of the optical inspection device of FIG. 1 inspecting a lens under inspection at a limited distance.

Reference numerals illustrate:

1 optical detection device

10 base

100 connecting plate

101 first stage

102 second stage

103 fixed column

11 camera

110 body

111 objective lens

112 extending arm

1111 lens barrel

1112 focus adjusting ring

12 drive motor

120 power assembly

121 rotation shaft

13 connecting piece

130 support

131 first fixing ring

132 second fixing ring

9 lens to be measured

D1: infinity distance

D2 finite distance

Detailed Description

The detailed features and advantages of the embodiments of the present utility model will be set forth in the detailed description that follows, so that those skilled in the art will understand and practice the technical content of the embodiments of the present utility model, and will readily understand the objects and advantages associated with the present utility model by those skilled in the art based on the disclosure, claims, and drawings herein. The following examples illustrate the aspects of the utility model in further detail, but are not intended to limit the scope of the utility model in any way.

Referring to fig. 1 to 4, fig. 1 is a schematic perspective view of an optical inspection device according to an embodiment of the utility model, fig. 2 is a schematic perspective view of a driving motor of the optical inspection device of fig. 1 driving a link to rotate a focus adjustment ring at a second position, fig. 3 is a schematic perspective view of the link of fig. 1, and fig. 4 is a schematic side view of a lens to be inspected when the optical inspection device of fig. 1 detects infinity.

The optical detection device 1 of the present embodiment is used for detecting a performance parameter of a lens 9 to be tested. In the present embodiment, the optical detection device 1 is used for detecting the lens resolution value of the lens 9 to be detected, but the utility model is not limited thereto. In other embodiments, the optical detection device 1 can be used to detect performance parameters such as photoelectric conversion function (Opto-Electronic Conversion Function, OECF), gray scale or optical spatial frequency response (Spatial Frequency Response, SFR) of the lens 9 to be tested. The optical detection device 1 detects the lens resolution value of the lens 9 to be measured, for example, by means of a modulation transfer function (Modulation Transfer Function, MTF) or a contrast transfer function (Contrast Transfer Function, CTF).

The optical inspection device 1 comprises a base 10, a camera 11, a driving motor 12 and a connecting member 13.

The base 10 includes a connection board 100, a first carrier 101, a second carrier 102, and a fixing post 103. The first carrier 101 and the second carrier 102 are respectively connected to opposite ends of the connection board 100, and the fixing posts 103 are disposed on the connection board 100, wherein the first carrier 101 extends along a direction perpendicular to the connection board 100, and the second carrier 102 extends along a direction parallel to the connection board 100. In the present embodiment, a step is formed between the second carrier 102 and the connection board 100, but the utility model is not limited thereto. In other embodiments, the second stage and the connection plate may be coplanar, for example.

The camera 11 includes a body 110, an objective 111 and an extension arm 112. The body 110 is disposed on the second stage 102 of the base 10, and the body 110 has an objective interface. The objective 111 includes a lens barrel 1111 and a focus adjusting ring 1112, wherein the lens barrel 1111 is detachably mounted on an objective interface of the body 110, and the focus adjusting ring 1112 is rotatably disposed on the lens barrel 1111. One end of the extension arm 112 is connected to one side of the body 110 opposite to the objective lens interface, the extension arm 112 extends away from the objective lens 111, and the other end of the extension arm 112 is fixed to the fixing post 103 of the base 10. In the embodiment, the lens barrel 1111 is detachably mounted on the objective lens interface of the body 110, but the utility model is not limited thereto. In other embodiments, the lens barrel 1111 is detachably and fixedly mounted to the body 110.

The drive motor 12 includes a power assembly 120 and a rotating shaft 121. The power assembly 120 is disposed on the first stage 101 of the base 10, and the rotation shaft 121 is rotatably disposed on the power assembly 120, wherein the power assembly 120 is configured to provide a driving force to rotate the rotation shaft 121.

The connecting piece 13 comprises a bracket 130, a first fixing ring 131 and a second fixing ring 132, wherein the first fixing ring 131 and the second fixing ring 132 are respectively connected to opposite ends of the bracket 130, the first fixing ring 131 is connected to the rotating shaft 121 of the driving motor 12, and the second fixing ring 132 is connected to and surrounds the focus adjusting ring 1112. In the present embodiment, the first fixing ring 131 is fixed to the rotation shaft 121 of the driving motor 12 through a screw, and the second fixing ring 132 is fixed to the focus adjusting ring 1112 through a screw, but the utility model is not limited thereto. In other embodiments, the first fixing ring 131 and the second fixing ring 132 may be fixed to the rotation shaft 121 and the focus adjusting ring 1112 respectively through other manners, such as a buckle.

As shown in fig. 1 and 2, the driving motor 12 is used to rotate the connecting member 13 through the rotation shaft 121 to drive the focal length adjusting ring 1112 to rotate, thereby adjusting the focal length of the objective lens 111. Therefore, the performance parameters of the lens 9 to be tested under different object distances can be detected. Specifically, please refer to fig. 4 and fig. 5 together, wherein fig. 5 is a side view of the optical inspection apparatus of fig. 1 for inspecting a lens under inspection at a limited distance.

The optical detection device 1 of the present embodiment can detect the performance parameters of the lens 9 under test at different object distances by adjusting the focal length of the camera 11. For example, as shown in fig. 4, when the object distance between the lens 9 to be measured and the camera 11 is infinity D1, the driving motor 12 is used to rotate the focal length adjusting ring 1112 to a first position, so that the objective lens 111 has a first focal length to detect the performance parameter of the lens 9 to be measured at infinity. On the other hand, as shown in fig. 5, when the object distance between the lens 9 to be measured and the camera 11 is the limited distance D2, the driving motor 12 is used to rotate the focal length adjusting ring 1112 to a second position, so that the objective lens 111 has a second focal length different from the first focal length, so as to detect the performance parameter of the lens 9 to be measured located at the limited distance.

With the above configuration, the tester can set the optical detection device 1, so that the optical detection device 1 can cooperate with different object distances of the lens 9 to be tested in a single test procedure, and the driving motor 12 drives the connecting piece 13 to automatically adjust the focal length of the objective lens 111, so as to detect the performance parameters of the lens 9 to be tested when the lens 9 is located at infinity and a limited distance.

In the present embodiment, the connecting member 13 has fixing rings 131 and 132 at opposite ends for connecting to the rotation shaft 121 and the focus adjusting ring 1112, respectively, but the present utility model is not limited to this structural feature. For example, in other embodiments, the connecting member may comprise a plurality of long plates, and opposite ends of each long plate are respectively connected to the rotation shaft and the focus adjustment ring, so that the driving motor can jointly drive the focus adjustment ring to rotate through the long plates.

In the present embodiment, the camera 11 has an extension arm 112, and the extension arm 112 is fixed to the fixing post 103 of the base 10, so that the camera 11 can be more firmly fixed to the base 10, but the utility model is not limited thereto, and the extension arm of the camera and the fixing post of the base can be selected. That is, in other embodiments, the camera may not have an extension arm but only a base fixed through the body, and the base may not have a fixing post.

In the present embodiment, the base 10 includes two stages 101, 102 extending in directions perpendicular to each other for the driving motor 12 and the camera 11 to be disposed, respectively, but the present utility model is not limited to this feature. In other embodiments, the camera and the drive motor may be disposed, for example, on the same plane of the mount.

According to the optical detection device of the embodiment, the driving motor automatically drives the connecting piece to rotate the focal length adjusting ring of the objective lens to adjust the focal length of the objective lens, so that the focal length of the objective lens is not required to be manually switched, the operation time required by manually switching the focal length is saved, and the resolving power value of the lens to be detected at infinity and the resolving power value of the lens to be detected at a limited distance can be detected by using a single optical detection device in a single test procedure. Thus, the multi-object distance lens detection can be more effectively completed.

Although the utility model has been described with reference to the preferred embodiments, it should be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this utility model.

Claims

1. An optical detection device for detecting a performance parameter of a lens to be detected, the optical detection device comprising:

the camera comprises a body and an objective lens, wherein the objective lens comprises a lens cone and a focal length adjusting ring, the lens cone is arranged on the body, and the focal length adjusting ring is rotatably arranged on the lens cone;

the driving motor comprises a power assembly and a rotating shaft, the rotating shaft is rotatably arranged on the power assembly, and the power assembly is used for providing driving force to enable the rotating shaft to rotate; and

the opposite ends of the connecting piece are respectively connected with the rotating shaft and the focus adjusting ring;

the driving motor is used for rotating the connecting piece through the rotating shaft to drive the focus adjusting ring to rotate, so that the focus of the objective lens is adjusted.

2. The optical inspection device according to claim 1, wherein the connecting member comprises a bracket, a first fixing ring and a second fixing ring, the first fixing ring and the second fixing ring are respectively connected to opposite ends of the bracket, the first fixing ring is connected to the rotating shaft of the driving motor, and the second fixing ring is connected to and surrounds the focus adjusting ring.

3. The optical inspection device according to claim 2, wherein the first fixing ring is fixed to the rotation shaft of the driving motor through a screw, and the second fixing ring is fixed to the focus adjusting ring through a screw.

4. The optical inspection device according to claim 1, wherein the driving motor is configured to rotate the focus adjusting ring to a first position when an object distance between the lens to be inspected and the camera is infinity, so that the objective lens has a first focus to inspect the performance parameter of the lens to be inspected at infinity.

5. The optical inspection device according to claim 4, wherein the driving motor is configured to rotate the focus adjusting ring to a second position when the object distance between the lens to be inspected and the camera is a limited distance, so that the objective lens has a second focus to inspect the performance parameter of the lens to be inspected at the limited distance, and the second focus is different from the first focus.

6. The optical inspection device according to claim 1, further comprising a base, wherein the power component of the driving motor and the body of the camera are disposed on the base.

7. The optical inspection device according to claim 6, wherein the base comprises a connecting plate, a first stage and a second stage, the first stage and the second stage are respectively connected to opposite ends of the connecting plate, the first stage extends along a direction perpendicular to the connecting plate, the second stage extends along a direction parallel to the connecting plate, the power component of the driving motor is disposed on the first stage, and the body of the camera is disposed on the second stage.

8. The optical inspection device according to claim 7, wherein the base further comprises a fixing post, the fixing post is disposed on the connecting plate, the camera further comprises an extension arm, the body has an objective interface, one end of the extension arm is connected to one side of the body opposite to the objective interface, the extension arm extends in a direction away from the objective, and the other end of the extension arm is fixed on the fixing post.

9. The optical inspection device according to claim 1, wherein the body has an objective interface, and the lens barrel is detachably mounted on the objective interface.