Single focus jig for verifying image quality of floating focus lens

Abstract

The utility model discloses a kind of single focus jigs corresponding to image quality verification of floating focusing lens, comprising: jig main body, coaxial and sequentially communicating front group accommodating cavity, moving group accommodating cavity and rear group accommodating cavity are equipped in the inner chamber of jig main body;Front pressing ring, for tightly fixing front group lens assembly in the front group accommodating cavity;Rear pressing ring, for tightly fixing moving group lens assembly and rear group lens assembly in the moving group accommodating cavity and rear group accommodating cavity respectively;Three single group elements in the inside of original floating focusing lens are in infinite far case, using metal material replaces original structural member, conversion into single focus lens, reduce the cumbersome procedure of each group of lens assembly, reduce assembly time.And not belonging to sensitive single group element is fixed, reduce the change amount caused by assembly process, greatly reduce variable in new forming lens group into lens, achieve single variable, reduce the risk of misjudgment to this lens.

Description

Technical Field

[0001] This utility model belongs to the field of lens adjustment technology, and specifically relates to a single-focus fixture for verifying image quality of a floating focusing lens. Background Technology

[0002] Currently, most floating focus lenses use glass and plastic lenses. However, due to the immature molding process for plastic lenses, even if the mold core dimensions are within the design range, the molding process involves too many molding conditions. Furthermore, the surface shape of the molded plastic sheet differs from the design, resulting in plastic lenses that fail to meet imaging requirements. Therefore, engineers need to adjust the molding process for lenses that do not meet design requirements.

[0003] The prototype lenses need to be assembled into the entire optical system, i.e., the entire lens, and then undergo imaging tests to determine if they meet the imaging requirements. Conventional multi-element lenses require certain structures to be fastened with nails during assembly. The structural components used in the early stages of development may not fully meet strength requirements, so structural deformation after fastening may occur, leading to imaging abnormalities and reduced lens image quality. Furthermore, repeated assembly during the replacement of new prototype lenses significantly reduces assembly precision, making it impossible to guarantee that only a single variable exists during assembly, resulting in misjudgments during lens resolution.

[0004] Therefore, this application provides a single-focus fixture for verifying image quality of a floating focusing lens, which aims to reduce misjudgments during lens resolution. Utility Model Content

[0005] This invention provides a single-focus fixture for verifying image quality of a floating focusing lens, aiming to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A single-focus fixture for verifying image quality of a floating focusing lens includes: The fixture body has an inner cavity that is coaxial and sequentially connected to a front receiving cavity, a movable receiving cavity, and a rear receiving cavity. A front pressure ring is used to press and fix the front lens assembly into the front receiving cavity; The rear pressure ring is used to press and fix the movable lens assembly and the rear lens assembly into the movable assembly receiving cavity and the rear assembly receiving cavity, respectively.

[0007] Furthermore, the diameter of the front receiving cavity decreases sequentially from the front to the rear of the fixture body; the diameters of the moving receiving cavity and the rear receiving cavity decrease sequentially from the rear to the front of the fixture body.

[0008] Furthermore, a first external thread is provided on the front outer wall of the fixture body, and a second external thread is provided on the rear outer wall; The inner wall of the front pressure ring is provided with a first internal thread that mates with the first external thread. The inner wall of the rear pressure ring is provided with a second internal thread that mates with the second external thread.

[0009] Furthermore, the main body of the fixture is made of aluminum alloy.

[0010] Compared with the prior art, the present invention has the following technical effects: 1. The floating focusing lens image quality verification single-focus fixture described in this utility model replaces the original three individual components of the floating focusing lens with metal materials when the original three components are at infinity, thus converting it into a single-focus lens. This reduces the cumbersome assembly process for each lens group and shortens assembly time. Furthermore, by fixing non-sensitive individual components, the amount of variation caused by the assembly process is reduced. This significantly reduces variables in the newly formed lens group, ensuring a single variable and lowering the risk of misjudgment of that lens. Attached Figure Description

[0011] Figure 1 This is an overall schematic diagram of a single-focus fixture for verifying image quality corresponding to a floating focusing lens as described in this utility model; Figure 2 This is a schematic diagram of the main body of a single-focus fixture for image quality verification corresponding to a floating focusing lens, as described in this utility model. Figure 3 This is a schematic diagram of the lens assembly and lens housing of a single-focus fixture for image quality verification corresponding to a floating focusing lens as described in this utility model.

[0012] In the picture: 1. Fixture body; 101. Front assembly receiving cavity; 102. Moving assembly receiving cavity; 103. Rear assembly receiving cavity; 104. First external threaded portion; 105. Second external threaded portion; 2. Front pressure ring; 201. First internal thread section; 3. Rear pressure ring; 301. Second internal thread section; 4. Front lens assembly; 5. Moving lens assembly; 6. Rear lens assembly; 7. Lens housing. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments of this application and the accompanying drawings.

[0014] like Figure 1-3 As shown, a single-focus fixture for verifying image quality of a floating focusing lens includes: The fixture body 1 has a coaxial and sequentially connected front receiving cavity 101, a movable receiving cavity 102, and a rear receiving cavity 103 in its inner cavity. The front pressure ring 2 is used to press and fix the front lens assembly 4 into the front receiving cavity 101; The rear pressure ring 3 is used to press and fix the movable lens assembly 5 and the rear lens assembly 6 into the movable assembly receiving cavity 102 and the rear assembly receiving cavity 103, respectively.

[0015] refer to Figure 3 The distribution of each lens group inside the lens housing 7 is shown in the figure. The single-focus fixture structure provided in this application replaces the original three single components inside the floating focusing lens with metal materials when they are at infinity, thus converting it into a single-focus lens. This reduces the cumbersome assembly process for each lens group and reduces assembly time. Furthermore, it fixes non-sensitive single components, reducing the amount of variation caused by the assembly process. This significantly reduces variables in the newly formed lens group entering the lens, ensuring that there is only one variable and reducing the risk of misjudging the lens.

[0016] When replacing the lens under test (such as the front lens assembly 4), engineers only need to remove and install the front pressure ring 2 and the front lens assembly 4. The moving lens assembly 5 and the rear lens assembly 6 remain stationary as a whole. This ensures that only one factor changes in the optical system during each test—the lens under test itself. This makes the test results purely reflect the lens performance, resulting in accurate and reliable conclusions and a significantly reduced risk of misjudgment.

[0017] like Figure 1-2 As shown, the diameter of the front receiving cavity 101 decreases sequentially from the front to the rear of the fixture body 1; the diameters of the moving receiving cavity 102 and the rear receiving cavity 103 decrease sequentially from the rear to the front of the fixture body 1. This stepped decreasing cavity structure provides an axial positioning surface for the lens assembly. When the lens assembly is installed from one side, its outer diameter naturally comes into close contact with the step where the cavity diameter changes, thereby accurately determining the position of the lens assembly in the optical axis direction. This ensures that the distance between the optical center of the lens assembly and the reference surface of the fixture body 1 is constant and accurate each time it is installed, eliminating image quality fluctuations caused by uncertain axial position. The gradually decreasing diameter design plays a guiding and self-aligning role during assembly. The operator can easily slide the lens assembly in, and the taper of the cavity guides the assembly to automatically align, reducing assembly difficulties or potential damage to the lens caused by tilting or jamming, making it particularly suitable for the rapid and repeated installation of precision components.

[0018] Setting the taper directions of the front and moving / rear groups in opposite directions aligns with the lens's optical structure and achieves physical isolation. This allows the fixture to be designed as a one-piece structure with openings at both ends and a continuous middle section, offering optimal rigidity and reducing manufacturing difficulty compared to modular designs. Furthermore, this design clearly defines the assembly paths of the front and rear modules, preventing accidental operation.

[0019] like Figure 1-2 As shown, a first external thread 104 is provided on the front outer wall of the fixture body 1, and a second external thread 105 is provided on the rear outer wall; The inner wall of the front pressure ring 2 is provided with a first internal thread 201 that mates with the first external thread 104; The inner wall of the rear pressure ring 3 is provided with a second internal thread 301 that mates with the second external thread 105. This threaded engagement allows for the application of a uniform, axial clamping force by rotating the pressure ring. Compared to the potential localized stress and structural deformation caused by "using nails for fastening" mentioned in the background art, the threaded pressure ring ensures that the lens assembly is smoothly and uniformly pressed against the positioning surface, avoiding lens stress or structural deformation caused by improper fastening, thus guaranteeing the original image quality of the optical system. The threaded connection offers excellent repeatability. The pressure ring can be easily tightened to a fixed position (e.g., tightened to a specific angle after reaching the bottom), and the same clamping state can be essentially reproduced after each disassembly and reinstallation. This avoids the problem of reduced assembly accuracy caused by repeated assembly, resulting in highly consistent testing conditions.

[0020] In one specific embodiment, the fixture body 1 is made of aluminum alloy. In another specific embodiment, the aluminum alloy is 6061-T6, with magnesium and silicon as alloying elements, possessing moderate strength and good corrosion resistance, as well as good oxidation resistance. During machining, dimensional accuracy can be guaranteed to meet design requirements. Compared to other structural components, it is more stable, and assembling the entire lens assembly into the fixture is more convenient and faster.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A single-focus fixture for verifying image quality corresponding to a floating focusing lens, characterized in that, include: The fixture body (1) has a coaxial and sequentially connected front receiving cavity (101), a movable receiving cavity (102), and a rear receiving cavity (103) in its inner cavity. The front pressure ring (2) is used to press and fix the front lens assembly (4) into the front receiving cavity (101); The rear pressure ring (3) is used to press and fix the moving lens assembly (5) and the rear lens assembly (6) into the moving assembly receiving cavity (102) and the rear assembly receiving cavity (103), respectively.

2. The single-focus fixture for verifying image quality corresponding to a floating focusing lens according to claim 1, characterized in that, The diameter of the front receiving cavity (101) decreases sequentially from the front side to the rear side of the fixture body (1); the diameters of the moving receiving cavity (102) and the rear receiving cavity (103) decrease sequentially from the rear side to the front side of the fixture body (1).

3. The single-focus fixture for verifying image quality corresponding to a floating focusing lens according to claim 2, characterized in that, The jig body (1) has a first external thread (104) on its front outer wall and a second external thread (105) on its rear outer wall. The inner wall of the front pressure ring (2) is provided with a first internal thread (201) that mates with the first external thread (104). The inner wall of the rear pressure ring (3) is provided with a second internal thread (301) that mates with the second external thread (105).

4. The single-focus fixture for verifying image quality corresponding to a floating focusing lens according to claim 3, characterized in that, The main body (1) of the fixture is made of aluminum alloy.

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