Detection device for lens

Abstract

The utility model provides a detection device for a lens, and belongs to the technical field of lens detection. Comprising a mounting base, a support is vertically arranged on the mounting base, a first mounting frame, a second mounting frame and a third mounting frame are arranged on the support from top to bottom at intervals, a lamp is arranged on the first mounting frame, the light emitting end of the lamp faces downwards, and a mounting groove used for containing a lens is formed in the position, right opposite to the lamp, of the second mounting frame. A light outlet channel is formed in the bottom wall of the mounting groove in a penetrating mode, an imaging screen used for displaying focusing light spots is arranged on the third mounting frame, and the first mounting frame, the second mounting frame and the third mounting frame are vertically arranged on the support in a sliding mode. The support is provided with three first limiting pieces used for limiting movement of the first installation frame, the second installation frame and the third installation frame respectively. The method has the effect of improving the detection convenience of workers.

Description

Technical Field

[0001] This utility model relates to the field of lens testing technology, and in particular to a lens testing device. Background Technology

[0002] Lenses are optical elements made of transparent materials (such as glass and crystal) and play an important role in fields such as astronomy, military, transportation, medicine, and art.

[0003] A convex lens is a common type of lens, frequently used in the production of magnifying glasses and other products. Convex lenses are thicker in the middle and thinner at the edges, and come in three types: biconvex, plano-convex, and concave-convex. In industrial production, after batch production of convex lenses, the focal length of a sample or all lenses needs to be tested to ensure that the focal length of the batch is within acceptable limits. To facilitate focal length testing of finished convex lenses, a lens testing device is needed. Utility Model Content

[0004] In view of the above problems, this utility model provides a lens detection device.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A lens detection device is provided, including a mounting base, a support vertically mounted on the mounting base, and a first mounting bracket, a second mounting bracket, and a third mounting bracket spaced from top to bottom on the support. The first mounting bracket is equipped with a lamp with its light-emitting end facing downwards. The second mounting bracket has a mounting groove for placing a lens at a position directly opposite the lamp, and a light-emitting channel is formed through the bottom wall of the mounting groove. The third mounting bracket is equipped with an imaging screen for displaying the focused light spot. The first, second, and third mounting brackets are all vertically slidably mounted on the support. The support is equipped with three first limiting members for respectively restricting the movement of the first, second, and third mounting brackets.

[0007] Furthermore, the second mounting frame includes a mounting frame and two sub-plates that are horizontally and linearly slidably disposed within the mounting frame. The two sub-plates have an arc-shaped opening on one side that is close to each other to form an output light channel. The two sub-plates have arc-shaped grooves at the arc-shaped openings to form mounting slots. The mounting frame is provided with a driving component for moving the two sub-plates.

[0008] Furthermore, the driving component includes a bidirectional screw and a guide rod. The bidirectional screw is rotatably mounted in the mounting frame, and the two plates are threadedly connected to the two threaded sections of the bidirectional screw. One end of the bidirectional screw passes through the mounting frame and is connected to a first handle. The guide rod is mounted in the mounting frame in a direction parallel to the movement of the plates, and the guide rod moves through the two plates.

[0009] Furthermore, the imaging screen is made of flexible materials.

[0010] Furthermore, the imaging screen is equipped with reference markings for indicating the acceptable size range of the focused spot.

[0011] Furthermore, the first limiting component includes a first limiting screw, and the first mounting bracket, the second mounting bracket and the third mounting bracket are slidably mounted on the bracket through three first slide blocks. The first limiting screw is threadedly connected to the corresponding first slide block and movably abuts against the outer wall of the bracket. One end of the first limiting screw is provided with a second handle.

[0012] Furthermore, a second slide block is vertically slidably disposed on the bracket between the first mounting bracket and the second mounting bracket. An object screen is rotatably disposed on the second slide block for cooperating with the lamp, imaging screen and lens to perform the conjugate method for focal length measurement. An irregularly shaped imaging hole is opened on the object screen. The bracket is vertically disposed with scale lines for marking the movement distance of the second slide block and the three first slide blocks. The bracket is also provided with a second limiting member for restricting the movement of the second slide block.

[0013] The beneficial effects of this utility model are as follows: Workers can turn on the lights and place the standard lens in the mounting slot; then, they can vertically adjust the positions of the first, second, and third mounting brackets until the focused spot on the imaging screen reaches the acceptable size range; finally, workers place the lenses to be tested one by one into the mounting slot. If the actual focused spot size of the test lens is larger than the acceptable focused spot, it indicates that the lens focal length is unacceptable; if the actual focused spot size of the test lens is not larger than the acceptable focused spot, it indicates that the lens focal length is acceptable. This improves the convenience of testing for workers. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a lens detection device according to an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the second mounting bracket structure of a lens detection device according to an embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the working state of the object screen of a lens detection device according to an embodiment of this application.

[0017] Among them, 1. Mounting base; 2. Bracket; 21. Scale line; 3. First mounting bracket; 31. Lamp; 4. Second mounting bracket; 41. Mounting frame; 42. Divider plate; 421. Arc-shaped opening; 422. Arc-shaped groove; 5. Third mounting bracket; 51. Imaging screen; 6. First limiting component; 7. Driving component; 71. Bidirectional screw; 72. Guide rod; 8. Reference mark; 9. First slide; 10. Second slide; 20. Object screen; 201. Imaging hole; 30. Second limiting component. Detailed Implementation

[0018] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0019] This application discloses a lens detection device, with reference to... Figure 1 , Figure 2 and Figure 3 The system includes a mounting base 1, on which a bracket 2 is vertically welded. A first mounting frame 3, a second mounting frame 4, and a third mounting frame 5 are spaced apart from top to bottom on the bracket 2. A lamp 31 is mounted on the first mounting frame 3, with its light-emitting end facing downwards. The second mounting frame 4 has a mounting groove for placing a lens at a position directly opposite the lamp 31, and a light-emitting channel is formed through the bottom wall of the mounting groove. An imaging screen 51 for displaying the focused light spot is mounted on the third mounting frame 5. The first mounting frame 3, the second mounting frame 4, and the third mounting frame 5 are all vertically slidably mounted on the bracket 2. The bracket 2 has three first limiting members 6 for respectively restricting the movement of the first mounting frame 3, the second mounting frame 4, and the third mounting frame 5.

[0020] In this embodiment, the operator can turn on the light fixture 31 and place the standard lens in the mounting slot; then, vertically adjust the positions of the first mounting bracket 3, the second mounting bracket 4, and the third mounting bracket 5 until the focused spot on the imaging screen 51 reaches a qualified size range; finally, the operator places the lenses to be tested one by one into the mounting slot. If the actual focused spot size of the test lens is larger than the qualified focused spot, it indicates that the lens focal length is unqualified; if the actual focused spot size of the test lens is not larger than the qualified focused spot, it indicates that the lens focal length is qualified. This lens testing device improves the convenience of testing for operators.

[0021] Furthermore, the second mounting frame 4 includes a mounting frame 41 and two sub-plates 42 that are horizontally and linearly slidably disposed within the mounting frame 41. The two sub-plates 42 have an arc-shaped opening 421 on one side that is close to each other to form a light output channel. The two sub-plates 42 have an arc-shaped groove 422 at the arc-shaped opening 421 to form a mounting groove. The mounting frame 41 is provided with a driving member 7 for driving the two sub-plates 42 to move.

[0022] In this embodiment, the distance between the two arc-shaped grooves 422 can be adjusted by driving the two plates 42 to move via the driving member 7, so that they can be fitted with lenses of various outer diameters, thereby improving the versatility of the device.

[0023] Specifically, the driving component 7 includes a bidirectional screw 71 and a guide rod 72. The bidirectional screw 71 is rotatably disposed within the mounting frame 41, and two partition plates 42 are respectively threadedly connected to the two threaded sections of the bidirectional screw 71. One end of the bidirectional screw 71 passes through the mounting frame 41 and is welded with a first handle. The guide rod 72 is disposed within the mounting frame 41 in a direction parallel to the movement of the partition plates 42, and the guide rod 72 moves through the two partition plates 42.

[0024] During the manual placement of the lens by the staff, the lens may slip and fall due to carelessness. To prevent the lens from falling onto the third mounting bracket 5 and causing damage, the imaging screen 51 is made of a flexible material. Specifically, the imaging screen 51 can be made of rubber.

[0025] Furthermore, the imaging screen 51 is provided with reference markings 8 for marking the acceptable size range of the focused spot.

[0026] In the embodiments of this application, when the size of the focused spot is greater than the reference mark 8, it indicates that the focal length of the lens being measured is unqualified; when the size of the focused spot is not greater than the reference mark 8, it indicates that the focal length of the lens being measured is qualified.

[0027] Specifically, the first limiting component 6 includes a first limiting screw, and the first mounting bracket 3, the second mounting bracket 4 and the third mounting bracket 5 are slidably mounted on the bracket 2 through three first sliding blocks 9. The first limiting screw is threadedly connected to the corresponding first sliding block 9 and moves against the outer wall of the bracket 2. A second handle is welded to one end of the first limiting screw.

[0028] In this embodiment, rotating the first limiting screw and making it abut against the outer wall of the bracket 2 can restrict the movement of the first slide block 9 relative to the bracket 2.

[0029] Furthermore, a second slide block 10 is vertically slidably disposed on the bracket 2 between the first mounting bracket 3 and the second mounting bracket 4. An object screen 20 is rotatably disposed on the second slide block 10 for cooperating with the lamp 31, the imaging screen 51 and the lens to perform the conjugate method for focal length measurement. An irregularly shaped imaging hole 201 is opened on the object screen 2. A scale line 21 is vertically disposed on the bracket 2 for marking the movement distance of the second slide block 10 and the three first slide blocks 9. The bracket 2 is also provided with a second limiting member 30 for restricting the movement of the second slide block 10.

[0030] In this embodiment, the second limiting member 30 includes a second limiting screw, which is threadedly connected to the second slide 10 and movably abuts against the outer wall of the bracket 2. One end of the object screen 20 is frictionally rotatably mounted on the second slide 10. For some lenses with high precision requirements, the operator can rotate the object screen 20 and position the imaging aperture 201 directly below the lamp 31, and then vertically adjust the positions of the first mounting bracket 3, the second mounting bracket 4, the third mounting bracket 5, and the object screen 20 before starting to measure the focal length using the conjugate method.

[0031] The conjugate method is based on the conjugate relationship between the object and the image. In this embodiment, the distance between the object screen 20 and the imaging screen 51 is D. Vertically moving the second mounting bracket 4 allows the lens to move vertically. By moving the lens, two clear real images can be formed on the imaging screen 51 (one magnified and one reduced). The focal length can be calculated using the distance difference d between the two lens positions and the formula:

[0032]

[0033] Where D > 4f.

[0034] The implementation principle of the lens testing device in this application embodiment is as follows: the operator can turn on the lamp 31 and place the standard lens in the mounting slot; then vertically adjust the positions of the first mounting bracket 3, the second mounting bracket 4, and the third mounting bracket 5 until the focused spot on the imaging screen 51 reaches the qualified size range; finally, the operator places the lens to be tested into the mounting slot one by one. If the actual focused spot size of the test lens is larger than the qualified focused spot, it indicates that the focal length of the lens is unqualified; if the actual focused spot size of the test lens is not larger than the qualified focused spot, it indicates that the focal length of the lens is qualified. This device improves the convenience of testing for operators.

[0035] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if these modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and modifications.

Claims

1. A lens detection device, characterized in that: The system includes a mounting base (1), on which a bracket (2) is vertically mounted. The bracket (2) is provided with a first mounting frame (3), a second mounting frame (4), and a third mounting frame (5) arranged from top to bottom. The first mounting frame (3) is provided with a lamp (31) with the light-emitting end of the lamp (31) facing downward. The second mounting frame (4) has a mounting groove for placing a lens at a position directly opposite the lamp (31), and a light-emitting channel is provided through the bottom wall of the mounting groove. The third mounting frame (5) is provided with an imaging screen (51) for displaying the focused light spot. The first mounting frame (3), the second mounting frame (4), and the third mounting frame (5) are all vertically slidably mounted on the bracket (2). The bracket (2) is provided with three first limiting members (6) for respectively restricting the movement of the first mounting frame (3), the second mounting frame (4), and the third mounting frame (5).

2. The lens detection device according to claim 1, characterized in that: The second mounting frame (4) includes a mounting frame (41) and two sub-plates (42) that are horizontally and linearly slidably disposed within the mounting frame (41). The two sub-plates (42) have an arc-shaped opening (421) on one side that is close to each other to form an output light channel. The two sub-plates (42) have an arc-shaped groove (422) at the arc-shaped opening (421) to form a mounting groove. The mounting frame (41) is provided with a driving member (7) for driving the two sub-plates (42) to move.

3. The lens detection device according to claim 2, characterized in that: The driving component (7) includes a bidirectional screw (71) and a guide rod (72). The bidirectional screw (71) is rotatably disposed in the mounting frame (41), and the two partition plates (42) are respectively threadedly connected to the two threaded sections of the bidirectional screw (71). One end of the bidirectional screw (71) passes through the mounting frame (41) and is connected to a first handle. The guide rod (72) is disposed in the mounting frame (41) in a direction parallel to the movement of the partition plates (42), and the guide rod (72) moves through the two partition plates (42).

4. The lens detection device according to claim 3, characterized in that: The imaging screen (51) is made of flexible material.

5. A lens detection device according to claim 2, characterized in that: The imaging screen (51) is provided with reference marks (8) for marking the acceptable size range of the focused spot.

6. The lens detection device according to claim 1, characterized in that: The first limiting member (6) includes a first limiting screw. The first mounting bracket (3), the second mounting bracket (4) and the third mounting bracket (5) are slidably mounted on the bracket (2) through three first slide blocks (9). The first limiting screw is threadedly connected to the corresponding first slide block (9) and movably abuts against the outer wall of the bracket (2). One end of the first limiting screw is provided with a second handle.

7. The lens detection device according to claim 1, characterized in that: The bracket (2) has a second slide block (10) vertically slidably disposed between the first mounting bracket (3) and the second mounting bracket (4). The second slide block (10) has an object screen (20) rotatably disposed on it for cooperating with the lamp (31), the imaging screen (51) and the lens to perform the conjugate method for focal length measurement. The object screen (20) has an irregularly shaped imaging hole (201). The bracket (2) has a scale line (21) vertically disposed on it for marking the movement distance of the second slide block (10) and the three first slide blocks (9). The bracket (2) also has a second limiting member (30) for limiting the movement of the second slide block (10).

Images