A kind of HR test fixture for adding glass sheet in front end of lens

Abstract

The utility model discloses a kind of HR test fixtures for glass piece is added to front end of lens, it is characterized by: including lens bearing disc, glass piece bearing module, lens bearing disc is disc type, one side of lens bearing disc has sunken platform part, the center of sunken platform part has locating boss, locating boss is coaxially provided with lens loading hole, lens loading hole penetrates lens bearing disc, glass piece bearing module is round cake type, glass piece bearing module one end center has the locating hole of axial penetration, glass piece bearing module is positioned on locating boss by locating hole, the other end of glass piece bearing module has glass piece loading hole arranged coaxially with locating hole, glass piece loading hole is coaxial with lens loading hole, the other side of lens bearing disc has locating datum plane.Afficient includes: its simple structure, assembly is convenient, positioning precision is high, can be combined for testing and installing glass piece to the optical influence of lens, also can be used as lens test fixture alone, improve utilization.

Description

Technical Field

[0001] This utility model relates to the field of camera testing fixtures, specifically to an HR testing fixture for adding a glass plate to the front end of a lens. Background Technology

[0002] In modern optical systems, it is common practice to mount glass elements (such as protective filters, UV filters, and polarizing filters) at the front of the lens. Their primary purpose is to protect the expensive front lens element from scratches, contamination, and mechanical shocks. However, these seemingly simple glass elements can have a significant impact on the lens's optical performance, including reduced resolution, altered contrast, and the introduction of chromatic aberration; therefore, accurately assessing the effect of glass element placement on lens performance is crucial.

[0003] The ImageMaster HR is a high-precision optical transfer function (MTF) measurement device. Existing test fixtures for the ImageMaster HR are mainly designed for lens testing. Therefore, a test fixture that can be fitted with a glass plate needs to be designed. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this utility model provides an HR test fixture for adding a glass plate to the front of a lens. It adopts a modular design, which can meet both conventional lens performance testing and lens testing with added glass plates.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A HR test fixture for adding a glass plate to the front end of a lens is characterized by comprising a lens support plate and a glass plate support module. The lens support plate is disc-shaped, with a recessed platform on one side and a positioning boss at the center of the recessed platform. A lens loading hole is coaxially arranged on the positioning boss, and the lens loading hole passes through the lens support plate. The glass plate support module is disc-shaped, with an axially penetrating positioning hole at the center of one end. The glass plate support module is positioned on the positioning boss through the positioning hole. The other end of the glass plate support module has a glass plate loading hole coaxially arranged with the positioning hole. The glass plate loading hole is coaxial with the lens loading hole. A positioning reference surface is located on the other side of the lens support plate.

[0007] Furthermore, the lens mounting hole includes a tapered guide section, an arc transition section, a lens positioning hole section, a lens bearing reference ring, and a light-transmitting hole section connected in sequence.

[0008] Furthermore, the parallelism between the lens bearing reference ring and the positioning reference surface is 0.01mm, the parallelism between the recessed platform and the positioning reference surface is 0.01mm, and the parallelism between the bottom surface of the glass plate loading hole and the positioning reference surface is 0.01mm.

[0009] Furthermore, three mounting holes are evenly distributed on the flange on the outer side of the recessed platform.

[0010] The advantages of this utility model include: its structure is simple, its assembly is convenient, its positioning accuracy is high, it can be used in combination to test the optical effect of adding a glass plate on the lens, or it can be used alone as a lens testing fixture, thus improving the utilization rate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the lens support plate structure of this utility model;

[0012] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0013] Figure 3 This is a schematic diagram of the glass sheet support module structure of this utility model;

[0014] Figure 4 This is a schematic diagram of the combined state structure of this utility model. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] One such Figure 1-4 The HR test fixture shown includes a lens support plate 1 and a glass plate support module 2. The lens support plate 1 is disc-shaped, with a recessed area 11 on one side and a positioning boss 12 at its center. The glass plate support module 2 is disc-shaped, with an axially penetrating positioning hole 21 at the center of one end. The glass plate support module 2 is positioned on the positioning boss 12 through the positioning hole 21. A lens loading hole 13 is coaxially arranged on the positioning boss 12, penetrating the lens support plate 1. The other end of the glass plate support module 2 has a glass plate loading hole 22 coaxially arranged with the positioning hole 21. The glass plate loading hole 22 is coaxial with the lens loading hole 13. The other side of the lens support plate 1 has a positioning reference surface 14 for positioning on the HR test equipment.

[0017] To facilitate precise positioning of the lens onto the lens support plate 1, the lens mounting hole 13 in this embodiment includes a tapered guide section 131, an arc transition section 132, a lens positioning hole section 133, a lens support reference ring 134, and a light-transmitting hole section 135 connected in sequence. The lens support reference ring 134 undergoes corner clearing processing to ensure that the bottom of the lens precisely fits against the lens support reference ring 134.

[0018] In this embodiment, the flatness of the bottom end face of the lens bearing plate, the flatness of the lens bearing reference ring 134, the flatness of the sinking part, the flatness of the bottom surface of the glass plate bearing module 2, and the flatness of the bottom surface of the glass loading hole are all controlled to be 0.008mm. The parallelism between the lens bearing reference ring 134 and the positioning reference surface 14 is 0.01mm, the parallelism between the sinking part 11 and the positioning reference surface 14 is 0.01mm, and the parallelism between the bottom surface of the glass plate loading hole 22 and the positioning reference surface 14 is 0.01mm.

[0019] In this utility model, three mounting holes 15 are evenly distributed on the flange on the outer side of the recessed platform 11, which are used to fix the lens support plate 1 on the equipment by screws.

[0020] The loading process of this utility model is as follows: the lens is installed on the support plate → the glass plate is placed on the support module → the support module is inserted into the support plate → the ImageMaster HR device is connected to complete the optical test.

[0021] The beneficial effects of this utility model are:

[0022] 1. Significantly improves the accuracy of optical testing

[0023] By using high-precision positioning of the split modules and coaxiality control after assembly, the deviation of the relative position of the "lens-glass plate" is effectively reduced, the systematic error of imaging quality testing is reduced, and the reliability of test data is significantly improved.

[0024] 2. Significantly improves the convenience of testing operations.

[0025] Modular design makes the process of "lens mounting → glass plate placement → fixture assembly" clearer:

[0026] Individual modules can complete component positioning separately, reducing debugging difficulty;

[0027] Nested assembly eliminates the need for complex tooling, reducing test preparation time.

[0028] 3. Enhance the adaptability and reusability of fixtures.

[0029] It adapts to the current testing requirements of ImageMaster HR devices and can directly connect to existing testing processes;

[0030] The modular structure and compatible size design allow for reuse in optical testing of lenses and glass plates within the same series, reducing the development and replacement costs of fixtures.

[0031] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A HR test fixture for adding a glass plate to the front end of a lens, characterized in that: The system includes a lens support plate (1) and a glass plate support module (2). The lens support plate (1) is disc-shaped and has a recessed platform (11) on one side. The recessed platform (11) has a positioning boss (12) at its center. A lens loading hole (13) is coaxially arranged on the positioning boss (12) and the lens loading hole (13) passes through the lens support plate (1). The glass plate support module (2) is disc-shaped and has an axially penetrating positioning hole (21) at the center of one end. The glass plate support module (2) is positioned on the positioning boss (12) through the positioning hole (21). The other end of the glass plate support module (2) has a glass plate loading hole (22) arranged coaxially with the positioning hole (21). The glass plate loading hole (22) is coaxial with the lens loading hole (13). The other side of the lens support plate (1) has a positioning reference surface (14).

2. The HR test fixture for adding a glass plate to the front end of a lens according to claim 1, characterized in that: The lens mounting hole (13) includes a tapered guide section (131), an arc transition section (132), a lens positioning hole section (133), a lens bearing reference ring (134), and a light-transmitting hole section (135) connected in sequence.

3. The HR test fixture for adding a glass plate to the front end of a lens according to claim 2, characterized in that: The parallelism between the lens bearing reference ring (134) and the positioning reference surface (14) is 0.01mm, the parallelism between the sinking part (11) and the positioning reference surface (14) is 0.01mm, and the parallelism between the bottom surface of the glass plate loading hole (22) and the positioning reference surface (14) is 0.01mm.

4. The HR test fixture for adding a glass plate to the front end of a lens according to claim 1, characterized in that: Three mounting holes (15) are evenly distributed on the flange on the outer side of the recessed platform (11).

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