CN215065171U - Testing device - Google Patents

Abstract

The application discloses testing arrangement, testing arrangement are used for testing zoom, and testing arrangement includes light source, leaded light component and imaging element. The light guide element is arranged on the light path of the light source. The imaging element and the light guide element are arranged at intervals, the imaging element comprises an imaging surface, and the light guide element is used for guiding light rays emitted from the light source to the zoom lens and guiding the light rays reflected from the zoom lens to the imaging element so as to form images on the imaging surface. The light guide element can guide light rays emitted by the light source into a lens group of the zoom lens, and the light rays reflected by the zoom lens can be guided to an imaging surface of the imaging element through the light guide element to be imaged. When a driving device of the zoom lens does not act, an imaging point on an imaging surface is obtained and used as an initial imaging point, then a real-time imaging point on the imaging surface is obtained in the process that the driving device drives the lens group to move, and the offset of the real-time imaging point and the initial imaging point is compared, so that whether the zoom lens is qualified or not is accurately judged.

Description

Testing device

Technical Field

The application relates to the technical field of optical testing, in particular to a testing device.

Background

Currently, in a zoom lens, a plurality of driving devices are generally provided to move different lens groups in an optical axis direction to achieve zooming. However, during the process of driving the lens group to move by the driving device, besides moving along the optical axis direction, there are dynamic inclinations in other directions, and the dynamic inclination during the movement affects the imaging quality, resulting in unqualified lens quality. Therefore, how to test the dynamic inclination angle of the driving device during the movement process to accurately test the quality of the lens becomes a technical problem for the research of technicians.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a testing device.

The test device of the embodiment of the application is used for testing the zoom lens and comprises a light source, a light guide element and an imaging element. The light guide element is arranged on a light path of the light source. The imaging element and the light guide element are arranged at intervals, the imaging element comprises an imaging surface, and the light guide element is used for guiding light rays emitted from the light source to the zoom lens and guiding the light rays reflected back from the zoom lens to the imaging element so as to form images on the imaging surface.

In the test device according to the embodiment of the present application, when the zoom lens needs to be tested, only the zoom lens needs to be mounted on the test device, the light guide element can guide the light emitted by the light source into the lens group of the zoom lens, and the light reflected by the zoom lens can be guided to the imaging surface of the imaging element through the light guide element for imaging. Therefore, only when the driving device of the zoom lens does not act, an imaging point on the imaging surface is acquired as an initial imaging point, then a real-time imaging point on the imaging surface is acquired in the process that the driving device drives the lens group to move, and the dynamic inclination angle of the driving device in the moving process can be measured by comparing the offset of the real-time imaging point and the initial imaging point, so that whether the zoom lens is qualified or not is accurately judged. Meanwhile, during testing, only the zoom lens is required to be integrally installed on the testing device, other elements are not required to be installed on the zoom lens, operation of testing personnel is facilitated, installation and disassembly during testing are facilitated, and testing efficiency is improved.

In some embodiments, the zoom lens includes a lens group and a driving device for driving the lens group to move in an optical axis direction of the zoom lens. When the lens group is still, a first image is formed on the imaging surface, and when the lens group is moved, a second image is formed on the imaging surface. In this way, whether the driving device is inclined or not can be judged by comparing whether the first image and the second image are superposed or not, and whether the zoom lens is qualified or not can be determined by calculating the inclination angle of the driving device by comparing the offset between the first image and the second image.

In some embodiments, the light guide element includes a condensing lens, the condensing lens and the imaging element are arranged along an optical axis of the condensing lens at a distance, the condensing lens is used for condensing light rays emitted by the light source and guiding the light rays to the zoom lens, and is used for condensing light rays reflected from the zoom lens and guiding the light rays to the imaging surface. In this way, the condensing lens can converge and guide the light rays emitted by the light source to the zoom lens and converge and guide the light rays reflected from the zoom lens to the imaging surface to realize imaging.

In some embodiments, the condenser lens is movable relative to the imaging element along an optical axis of the condenser lens. Therefore, the condensing lens can be matched with the zoom lens, light rays emitted by the light source are guaranteed to be converged all the time and guided to the zoom lens, and the position of the condensing lens can be adjusted so that the light rays emitted by the light source can form a clear image on an imaging surface.

In some embodiments, the light guide element further includes a light conversion member, the light conversion member is disposed between the condensing lens and the imaging element, the light source is disposed on one side of the light conversion member and faces the light conversion member, the light conversion member is configured to reflect light emitted from the light source to the condensing lens, and light reflected from the zoom lens can penetrate through the light conversion member after being converged by the condensing lens and then irradiate on the imaging surface. Therefore, the light conversion piece can convert the test light emitted by the light source to the condensing lens, so that the light is guided to the zoom lens.

In some embodiments, the light guide element further includes a collimating lens disposed between the light-turning member and the light source, the light source faces the collimating lens, and light emitted from the light source is collimated by the collimating lens and then enters the light-turning member. Therefore, the collimating lens can collimate the light emitted by the light source and transmit the light to the light conversion piece.

In some embodiments, the light-diverting member comprises a half-mirror. Therefore, the half-reflecting and half-transmitting mirror can turn the light rays to the zoom lens and can enable the light rays to penetrate through the light turning piece when the test light rays are reflected by the zoom lens so as to form imaging on the imaging surface of the imaging element.

In some embodiments, the light emitted by the light source has a logo pattern, and the image formed on the imaging surface also has a corresponding logo pattern. Therefore, whether imaging is complete or not can be judged through the identification pattern, and the position deviation of the first image and the second image can be accurately found through the identification pattern.

In some embodiments, the identification pattern is a cross pattern. Therefore, the cross pattern is convenient for specific numerical measurement and calculation, and an accurate detection result is obtained.

In some embodiments, the imaging element comprises an image sensor. In this manner, the image sensor can identify the image position and transmit the position information back to the electronic processor to calculate the offset of the imaging point by the electronic processor.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a test apparatus according to an embodiment of the present application;

FIG. 2 is a schematic illustration of an identification of an imaging plane of an embodiment of the present application;

fig. 3 is a schematic view of another mark of an imaging surface according to an embodiment of the present application.

Description of the main element symbols:

a test apparatus 100;

the zoom lens 10, the lens group 11, the driving device 12, the lens barrel 13, the light source 20, the light guide element 30, the condenser lens 31, the light conversion element 32, the half mirror 321, the collimating lens 33, the imaging element 40, the imaging surface 41 and the image sensor 42.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of brevity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, the present embodiment provides a testing apparatus 100, the testing apparatus 100 is used for testing a zoom lens 10, and the testing apparatus 100 includes a light source 20, a light guide element 30 and an imaging element 40. The light guide element 30 is disposed on the optical path of the light source 20. The imaging element 40 is spaced apart from the light guide element 30, the imaging element 40 includes an imaging surface 41, the light guide element 30 is used for guiding the light emitted from the light source 20 to the zoom lens 10, and guiding the light reflected from the zoom lens 10 to the imaging element 40 to form an image on the imaging surface 41.

In the testing device 100 of the embodiment of the present application, when the zoom lens 10 needs to be tested, only the zoom lens 10 needs to be mounted on the testing device 100, the light guiding element 30 can guide the light emitted from the light source 20 into the lens group 11 of the zoom lens 10, and the light reflected by the zoom lens 10 can be guided to the imaging surface 41 of the imaging element 40 through the light guiding element 30 for imaging. In this way, it is only necessary to obtain an imaging point on the imaging surface 41 as an initial imaging point when the driving device 12 of the zoom lens 10 does not operate, then obtain a real-time imaging point on the imaging surface 41 in the process that the driving device 12 drives the lens group 11 to move, and the measurement of the dynamic inclination angle of the driving device 12 in the moving process can be realized by comparing the offset between the real-time imaging point and the initial imaging point, so as to accurately determine whether the zoom lens 10 is qualified. Meanwhile, during testing, only the zoom lens 10 needs to be integrally mounted on the testing device 100, and other elements do not need to be mounted on the zoom lens 10, so that the operation of a tester is facilitated, the mounting and dismounting during testing are facilitated, and the testing efficiency is improved. Specifically, in the embodiment of the present application, the zoom lens 10 may be a periscopic lens.

Referring to fig. 2 and 3, in some embodiments, the zoom lens 10 includes a lens group 11 and a driving device 12, and the driving device 12 is used for driving the lens group 11 to move along an optical axis of the zoom lens 10. A first image is formed on the imaging surface 41 when the lens group 11 is stationary, and a second image is formed on the imaging surface 41 when the lens group 11 is moving.

In this way, it is only necessary to compare whether the first image and the second image are coincident to determine whether the driving device 12 is tilted and whether the zoom lens 10 is acceptable can be determined by calculating the tilt angle of the driving device 12 by comparing the amount of shift between the first image and the second image.

It is understood that the zoom lens 10 can realize optical zooming by driving the movement of the lens group 11 by the driving device 12. The lens group 11 may be one or more lenses, which may be convex, concave, or a combination of convex and concave. The zoom lens 10 may further include a lens barrel 13, the lens group 11 and the driving device 12 may be disposed inside the lens barrel 13, and the lens barrel 13 may function to protect and support the lens group 11 and the driving device 12. In addition, in the embodiment of the present application, the number of the lens groups 11 may be multiple, the number of the driving devices 12 may also be multiple, each lens group 11 may correspond to one driving device 12 or one driving device 12 corresponds to multiple lens groups 11, and particularly, without limitation, when a dynamic tilt angle of one of the driving devices 12 needs to be measured, the other driving devices 12 and the lens groups 11 corresponding to the other driving devices 12 are stationary, so that each driving device 12 of the zoom lens 10 can be subjected to tilt angle measurement, and the purpose of detecting whether the zoom lens 10 is qualified is achieved.

Specifically, the light source 20 is used to provide the test light to the test device 100, or the light source 20 may be used to emit the test light in a predetermined direction toward the light guide element 30. The light guide element 30 may guide the test light to guide the test light emitted from the light source 20 to the zoom lens 10, and the light guide element 30 may guide the light reflected from the zoom lens 10 to the imaging element 40 to form an image on the imaging surface 41. In this way, in the initial state, or in the case that the lens group 11 and the driving device 12 of the zoom lens 10 are both kept still, that is, the focal length of the zoom lens 10 is not changed, the light rays incident into the zoom lens 10 are reflected by the lens group 11 of the zoom lens 10 to form a first image on the imaging surface 41. Then, the driving device 12 drives the lens group 11 to move in the optical axis direction of the zoom lens 10, or the lens group 11 starts zooming, the lens group 11 moves relative to the lens barrel 13, the light source 20 and the imaging element 40 are not moved, and a second image is formed on the imaging surface 41. In this way, the measurement of the tilt angle, that is, the measurement of the dynamic tilt angle of the driving device 12 during the movement process, can be realized by comparing the offset between the positions of the second image and the first image, so as to accurately determine whether the zoom lens 10 is qualified.

In addition, it should be noted that, in the embodiment of the present application, the shapes of the first image and the second image are the same, and the image definitions of the first image and the second image on the image forming surface 41 are also the same, and there is only a difference in position between the first image and the second image.

Referring to fig. 1 and 2, in some embodiments, the light guide element 30 includes a condensing lens 31, the condensing lens 31 and the imaging element 40 are disposed at an interval along an optical axis of the condensing lens 31, the condensing lens 31 is configured to condense and guide the light emitted from the light source 20 to the zoom lens 10, and is configured to condense and guide the light reflected from the zoom lens 10 to the imaging surface 41.

In this way, the condensing lens 31 may converge and guide the light emitted from the light source 20 to the zoom lens 10, and may also converge and guide the light reflected from the zoom lens 10 to the imaging surface 41, so as to finally realize forming an image on the imaging surface 41, so as to detect whether the zoom lens 10 is qualified.

Specifically, the condenser lens 31 may be a convex lens, and the convex lens may condense the light. The condenser lens 31, the zoom lens 10 and the imaging element 40 are disposed along the optical axis of the condenser lens 31 at intervals, and the zoom lens 10 and the imaging element 40 are disposed on two sides of the condenser lens 31, respectively, so that the condenser lens 31 can converge and guide the light emitted from the light source 20 to the zoom lens 10 on one hand, and converge and guide the light reflected from the zoom lens 10 to the imaging surface 41 on the other hand, to form a first image on the imaging surface 41.

Further, referring to fig. 1, in some embodiments, the condenser lens 31 can move along the optical axis of the condenser lens 31 relative to the imaging element 40.

Therefore, the condensing lens 31 can be matched with the zoom lens 10 to ensure that the light emitted by the light source 20 is always converged and guided to the zoom lens 10, and the position of the condensing lens 31 can be adjusted to match the movement of the lens group 11 of the zoom lens 10 so as to adjust the focal length of an optical system consisting of the zoom lens 10 and the condensing lens 31, so that the light emitted by the light source 20 can form a clear image on the imaging surface 41 to be compared with the initial imaging so as to achieve the purpose of measuring the inclination angle. It is understood that, in such an embodiment, when one of the lens groups 11 of the zoom lens 10 moves, the condenser lens 31 also needs to move accordingly so as to make the image formed on the image forming surface 41 coincide with the definition of the initial image, i.e. make the definition and shape size of the first and second images completely coincide.

Specifically, the condenser lens 31 is movable along the optical axis of the condenser lens 31 relative to the imaging element 40 to match the movement of the lens group 11, so that the condenser lens 31 can always converge light onto the lens group 11. In one example, the lens group 11 in the zoom lens 10 is driven by the driving device 12 to move away from the imaging element 40, and the condenser lens 31 is also driven to move away from the imaging element 40, so that the condenser lens 31 can always converge and guide the light emitted from the light source 20 to the zoom lens 10. In another example, the lens group 11 in the zoom lens 10 is driven by the driving device 12 to move toward the imaging element 40, and the condenser lens 31 is also driven to move toward the imaging element 40, so that the condenser lens 31 can always converge and guide the light emitted from the light source 20 to the zoom lens 10.

In addition, in some embodiments, the light source 20 may be a point light source that emits light at an angle. In some embodiments, the test light emitted by the light source 20 may be laser light, and the test accuracy of the test method according to the embodiments of the present application is improved due to the fact that the laser light has higher brightness and better directivity. In the embodiment of the present application, the type of the light source 20 is not limited to meet various requirements. For different kinds of light sources 20, the distance between the condensing lens 31 and the zoom lens 10 may also be adjusted so that the light rays may be converged and directed to the zoom lens 10.

Referring to fig. 1 and 3, in some embodiments, the light guide element 30 further includes a light converter 32, the light converter 32 is disposed between the condensing lens 31 and the imaging element 40, the light source 20 is disposed on one side of the light converter 32 and faces the light converter 32, the light converter 32 is configured to reflect light emitted from the light source 20 to the condensing lens 31, and light reflected from the zoom lens 10 is converged by the condensing lens 31, can pass through the light converter 32, and then irradiates the imaging surface 41.

In this way, the light-turning member 32 can turn the test light emitted from the light source 20 to the zoom lens 10 to prevent the light source 20 from being disposed along the optical axis to affect the light transmission.

Further, referring to fig. 1, in some embodiments, the light-converting element 32 includes a half-reflecting half-transmitting mirror 321.

Thus, the transflective mirror 321 is an element that can reflect part of the light and transmit part of the light. The light-converting element 32 can convert the light to the zoom lens 10, and when the test light is reflected by the zoom lens 10, the light can pass through the light-converting element 32 to form an image on the imaging surface 41 of the imaging element 40, thereby completing the detection of the zoom lens 10.

For example, the test light emitted from the light source 20 may be parallel light, and the light-converting member 32 may be disposed at an angle of 45 degrees with respect to the test light, so that the direction of the reflected light after the parallel light is incident on the light-converting member 32 is 90 degrees with respect to the incident direction. The condenser lens 31 and the zoom lens 10 are placed along the line of the reflected light, or the light conversion member 32 is disposed at a position forming an angle of 45 degrees with the optical axis of the condenser lens 31, the parallel light enters the focus lens to be converged and guided to the lens group 11, and the lens group 11 reflects the light, so that the light can pass through the condenser lens 31 and the half-reflecting and half-transmitting lens 321, and finally a first image is formed on the imaging element 40. At this time, the focal length of the lens group 11 is adjusted by the driving device 12 so that the lens group 11 moves in a direction away from the imaging element 40, and the condenser lens 31 is adjusted to move in a direction away from the imaging element 40 along the optical axis so that the light can be converged on the lens group 11 at all times. The remaining elements are not in position, and thus, a second image is formed on the imaging element 40. Comparing the positions of the second image and the first image, whether the lens group 11 has an inclination angle in the driving process of the driving device 12 can be tested, and the quality of the zoom lens 10 can be accurately tested.

In one example, the first image and the second image are completely overlapped, or the position error of the first image and the second image is within the allowable range, the zoom lens 10 has better quality. In another example, if the first image and the second image have a large difference in position, the zoom lens 10 will not be of sufficient quality.

Referring to fig. 1, in some embodiments, the light guide element 30 further includes a collimating lens 33, the collimating lens 33 is disposed between the light conversion member 32 and the light source 20, the light source 20 faces the collimating lens 33, and the light emitted from the light source 20 is collimated by the collimating lens 33 and then enters the light conversion member 32.

In this way, the collimating lens 33 is disposed between the light conversion member 32 and the light source 20, and can collimate the light emitted from the light source 20 and transmit the collimated light to the light conversion member 32.

Specifically, it can be understood that the light emitted from the light source 20 is a light with a certain angle around the light source 20, and the collimating lens 33 can converge and collimate the light emitted from the light source 20, so that the light emitted from the light source 20 into the light-turning part 32 tends to be parallel. Or the collimating lens 33 can direct as much light as possible from the light source 20 to the light-transmitting member 32 in parallel, so that the image can be finally formed on the imaging element 40 clearly.

Referring to fig. 1, in some embodiments, the light emitted from the light source 20 has a logo pattern, and the image formed on the image plane 41 also has a corresponding logo pattern.

Therefore, whether imaging is complete or not can be judged through the identification pattern, and the position deviation of the first image and the second image can be accurately found through the identification pattern.

Further, referring to fig. 1 and 3, in some embodiments, the identification pattern is a cross pattern.

Thus, the specific change value of the inclination angle when the lens group 11 zooms can be measured by comparing the positions of the first image and the second image of the cross pattern on the imaging surface 41, and then an accurate detection result is obtained.

For example, the light source 20 may emit a test light beam with a cross-shaped identification pattern, the test light beam first passes through the collimating lens 33, and the test light beam is collimated by the collimating lens 33 and then enters the light-converting member 32. The light-transmitting member 32 is a half-reflecting and half-transmitting lens 321, and can turn part of the light, the turned light enters the focusing lens to be converged and guided to the lens group 11, and the lens group 11 can reflect the light. The light reflected by the lens group 11 can pass through the condenser lens 31 and the half mirror 321 in sequence to form a first image of a cross pattern on the imaging element 40. At this time, the focal length of the lens group 11 is adjusted by the driving device 12 so that the lens group 11 moves in a direction approaching the imaging element 40, and the condenser lens 31 is adjusted to move in a direction approaching the imaging element 40 along the optical axis so that the light can be converged on the lens group 11 all the time. The remaining elements are stationary and thus a second image of the cross pattern is formed on the imaging element 40. The cross pattern may facilitate the establishment of a coordinate system to assist in measuring the distance between the first image and the second image. The positions of the two cross patterns are compared to calculate the changed distance between the first image and the second image, so that whether the lens group 11 has an inclination angle in the process of being driven by the driving device 12 can be tested, and the quality of the zoom lens 10 can be accurately tested.

It can be understood that, in the embodiment of the present application, the quality of the image formed by the zoom lens 10 can be obtained by the offset of the cursor, and the larger the offset of the first image and the second image, the larger the inclination angle of the lens group 11 of the zoom lens 10 in the process of moving to zoom is, the poorer the quality of the image formed by the zoom lens 10 is. Conversely, the smaller the first and second image shift amounts are, the smaller the inclination angle of the lens group 11 of the zoom lens 10 in moving to achieve zooming is, and the better the imaging quality of the zoom lens 10 is.

Referring to fig. 2, in some embodiments, the cross patterns of the first image and the second image are completely overlapped, or the position errors of the first image and the second image are within an allowable range, the cross center a of the first image and the cross center B of the second image are substantially overlapped, and the error is negligible, so that the quality of the zoom lens 10 is better. Referring to fig. 3, in some embodiments, the distance between the cross patterns of the first image and the second image is significant, and the center a of the cross of the first image can be taken as the origin of coordinates, and the center B of the cross of the second image can be taken as x and y on the abscissa. The amount of positional deviation of the second image with respect to the first image can be obtained from the coordinate information, and the dynamic tilt angle of the zoom lens 10 can be calculated.

Referring to fig. 1, in some embodiments, the imaging element 40 includes an image sensor 42.

In this way, the image sensor 42 can identify the image position and generate a signal according to the position information to transmit the signal back to the electronic processor for calculating the offset of the imaging point by the electronic processor, thereby calculating the dynamic tilt angle of the lens group 11 during the driving process of the driving device 12.

Specifically, the image sensor 42 is used for converting the image on the imaging surface 41 into an electrical signal in a proportional relationship with the image, and transmitting the electrical signal back to the processor (not shown). The processor has previously inputted the distance information of each element, and the processor calculates the dynamic inclination angle according to the obtained data, thereby accurately judging whether the zoom lens 10 is qualified.

In the description of the embodiments of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A test apparatus for testing a zoom lens, the test apparatus comprising:

a light source;

a light guide element disposed on a light path of the light source;

the imaging element is arranged at a distance from the light guide element and comprises an imaging surface, and the light guide element is used for guiding light rays emitted from the light source to the zoom lens and guiding the light rays reflected back from the zoom lens to the imaging element so as to form images on the imaging surface.

2. The test apparatus as claimed in claim 1, wherein the zoom lens includes a lens group and a driving device for driving the lens group to move in an optical axis direction of the zoom lens;

when the lens group is still, a first image is formed on the imaging surface, and when the lens group is moved, a second image is formed on the imaging surface.

3. The testing device of claim 1, wherein the light guide element comprises a condensing lens, the condensing lens and the imaging element are arranged along an optical axis of the condensing lens at a distance, and the condensing lens is used for converging light rays emitted by the light source and guiding the light rays to the zoom lens and converging light rays reflected from the zoom lens and guiding the light rays to the imaging surface.

4. The test device of claim 3, wherein the condenser lens is movable relative to the imaging element along an optical axis of the condenser lens.

5. The testing device according to claim 3, wherein the light guiding element further comprises a light converter, the light converter is disposed between the condensing lens and the imaging element, the light source is disposed on one side of the light converter and faces the light converter, the light converter is configured to reflect the light emitted from the light source to the condensing lens, and the light reflected from the zoom lens is converged by the condensing lens and then can pass through the light converter to irradiate on the imaging surface.

6. The testing device as claimed in claim 5, wherein the light guide element further comprises a collimating lens, the collimating lens is disposed between the light-turning member and the light source, the light source faces the collimating lens, and light emitted from the light source is collimated by the collimating lens and then enters the light-turning member.

7. The test device of claim 5, wherein the light transfer member comprises a half-mirror.

8. The testing device of claim 1, wherein the light source emits light having a pattern of markings, and wherein the image formed on the imaging surface also has a corresponding pattern of markings.

9. The testing device of claim 8, wherein the identification pattern is a cross pattern.

10. A test device as claimed in any one of claims 1 to 9, wherein the imaging element comprises an image sensor.

Images