Clamping and locking mechanism for biconvex cylindrical lens

Abstract

The clamping and locking mechanism comprises a lower clamp, an upper clamp and a die, the biconvex cylindrical lens is placed on the lower clamp, the upper clamp and the lower clamp are matched through threads to fix the biconvex cylindrical lens on the lower clamp, the upper clamp is of a hollow tubular structure, the die is of a hollow tubular structure, and the lower clamp is of a hollow tubular structure. The upper end of the inner wall of the upper clamp abuts against the edge of the upper curvature face of the biconvex cylindrical lens, the lower surface of the mold abuts against the upper curvature face of the biconvex cylindrical lens, and the upper curvature face of the biconvex cylindrical lens is ground. According to the utility model, the problem of poor appearance caused by adhesive connection can be avoided while the biconvex cylindrical lens can be stably clamped.

Description

Technical Field

[0001] The utility model relates to the technical field of lens processing jigs, in particular to a clamping and locking mechanism for a double convex cylindrical lens. Background Art

[0002] For the fine grinding or polishing of thick biconvex cylindrical lenses (the ratio of the lens center thickness to the diameter is greater than 1), the clamping method is commonly used. The clamping method includes clamping one end of the lens with a groove clamp to process the curvature surface of the other end, but the lens will shake severely under this clamping method, and the processed surface accuracy is low. In addition, the curvature surface of one end of the lens can be processed by gluing the curvature surface of the lens. Since the lens bonding curvature surface and the clamp are fixedly connected by gluing, it is difficult to adjust the concentricity of the clamp and the lens in this way. It is difficult to ensure the accuracy of the thickness of the entire lens through direct processing. At the same time, the gluing method will also cause the appearance of the lens bonding curvature surface to be poor. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide a clamping and locking mechanism for a biconvex cylindrical lens that is easy to disassemble and assemble, which can stably clamp the biconvex cylindrical lens and avoid the problem of poor appearance caused by adhesive fixation.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a clamping and locking mechanism for a double convex cylindrical lens, comprising a lower clamp, an upper clamp, and a mold, wherein the double convex cylindrical lens is placed on the lower clamp, and the upper clamp and the lower clamp are threadedly matched to fix the double convex cylindrical lens on the lower clamp, the upper clamp is a hollow tubular structure, the upper end of the inner wall of the upper clamp abuts against the edge of the upper curvature surface of the double convex cylindrical lens, the lower surface of the mold abuts against the upper curvature surface of the double convex cylindrical lens, and the upper curvature surface of the convex cylindrical lens is ground.

[0005] Among them, the lower part of the lower clamp is a cylindrical handle, the upper part is hollow inside, and the upper end face is provided with a step that sinks into the inner cavity for placing the lower curvature surface of the biconvex cylindrical lens, and the upper curvature surface of the biconvex cylindrical lens protrudes from the upper end face of the lower clamp.

[0006] Wherein, the upper end surface of the lower clamp is provided with a groove cut downward along its radial direction.

[0007] Wherein, the upper outer ring of the lower clamp is provided with a thread, and the upper end of the thread is a slope that shrinks inwards from the upper end surface.

[0008] Among them, the lower part of the inner wall of the upper clamp is provided with a thread adapted to the upper outer ring of the lower clamp, and the upper part of the inner wall is an inclined surface contracted inwardly, and the inclination angle of the inclined surface is less than or equal to the inclination angle of the upper slope of the lower clamp.

[0009] Wherein, the mold is a flat concave cylindrical structure, and its diameter is smaller than the diameter of the biconvex cylindrical lens and smaller than the inner diameter of the upper port of the upper fixture.

[0010] Wherein, a loading layer is provided on the lower surface of the mold.

[0011] Wherein, a V-shaped groove for placing a pressure head is provided at the center of the upper surface of the mold.

[0012] Beneficial effects: The utility model has the following advantages:

[0013] 1. This mechanism has a simple structure. Through the locking mechanism of the upper and lower clamps, it can stably clamp the biconvex cylindrical lens to ensure the fixation of the biconvex cylindrical lens during the grinding process, thereby processing a high-precision lens surface shape;

[0014] 2. This mechanism is easy to disassemble and assemble, and is convenient for fine-tuning the position of the biconvex cylindrical lens in the lower fixture, and can ensure the concentricity of the lens and the fixture during processing;

[0015] 3. The setting of the groove increases the elasticity of the upper part of the lower clamp, making it easier to lock the upper clamp and the lower clamp through threaded fit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the clamping and locking mechanism. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is described in detail below in conjunction with the embodiments and drawings.

[0018] like Figure 1 As shown, the clamping and locking mechanism includes a cylindrical lower clamp 1, a hollow circular ring-shaped upper clamp 3, and a cylindrical mold 4, wherein a biconvex cylindrical lens 2 is placed between the cylindrical lower clamp 1 and the hollow circular ring-shaped upper clamp 3, and the outermost portion of the lower curved surface of the biconvex cylindrical lens 2 is a step surface for installation.

[0019] The cylindrical lower fixture 1 is made of plastic, preferably white steel, with a cylindrical handle at the bottom and a hollow top. The upper end surface is provided with a step that sinks into the inner cavity, and the step is used to place the step surface of the lower curved surface of the biconvex cylindrical lens 2, that is, the biconvex cylindrical lens 2 is placed on the step that sinks into the inner cavity of the cylindrical lower fixture 1 through the outermost step surface of its lower curved surface. The maximum diameter of the step that sinks into the inner cavity of the cylindrical lower fixture 1 is greater than the diameter of the biconvex cylindrical lens 2, and the minimum diameter of the step that sinks into the inner cavity of the cylindrical lower fixture 1 is less than the diameter of the biconvex cylindrical lens 2 and greater than the minimum diameter of the step surface of the lower curved surface of the biconvex cylindrical lens 2. The upper curvature surface of the biconvex cylindrical lens 2 protrudes from the upper end surface of the cylindrical lower fixture 1.

[0020] The upper end surface of the cylindrical lower clamp 1 is provided with a groove cut downward along its radial direction, and the upper outer ring of the cylindrical lower clamp 1 is provided with a thread, and the upper end of the thread is a slope contracting inwardly from the upper end surface.

[0021] The hollow circular ring-shaped upper clamp 3 is made of metal and has a hollow tubular structure. The lower part of its inner wall is provided with a thread that matches the upper outer ring of the cylindrical lower clamp 1. The upper part of the inner wall is an inwardly contracted inclined surface, and the inclination angle of the inclined surface is less than or equal to the inclination angle of the upper slope of the cylindrical lower clamp 1. The diameter of the upper end of the inner cavity of the hollow circular ring-shaped upper clamp 3 is smaller than the diameter of the upper curved surface of the double convex cylindrical lens 2.

[0022] Based on the above structure, when the hollow ring-shaped upper fixture 3 is threadedly engaged with the cylindrical lower fixture 1, the biconvex cylindrical lens 2 can be further fixed on the step where the upper end of the cylindrical lower fixture 1 sinks into the inner cavity. The groove is provided to increase the elasticity of the upper part of the cylindrical lower fixture 1, so as to facilitate the locking between the hollow ring-shaped upper fixture 3 and the cylindrical lower fixture 1 through threaded engagement.

[0023] The cylindrical mold 4 is made of metal, preferably cast iron, and is a flat concave cylindrical structure, with a diameter smaller than the diameter of the biconvex cylindrical lens 2 and smaller than the inner diameter of the upper port of the hollow circular ring-shaped upper fixture 3. Its lower surface is a standard concave curvature surface, and is provided with a loading layer. The material of the loading layer is polyurethane in the polishing stage and diamond in the fine grinding stage. A V-shaped groove for placing a pressure head is provided in the center of the upper surface of the cylindrical mold 4. The lower surface of the cylindrical mold 4 grinds the upper surface of the biconvex cylindrical lens 2 through the upper port of the hollow circular ring-shaped upper fixture 3.

[0024] Working principle: 1. Fix the cylindrical lower fixture 1 on the processing machine through the handle at its lower part;

[0025] 2. Wrap the outer ring of the biconvex cylindrical lens 2 with a layer of velvet, and place it on the inner cavity step of the hollow cylindrical lower fixture 1 through the step of its lower curvature surface;

[0026] 3. Thread the hollow ring-shaped upper fixture 3 and the cylindrical lower fixture 1 to fix the biconvex cylindrical lens 2, wherein a flannel is provided between the contact surfaces of the hollow ring-shaped upper fixture 3 and the biconvex cylindrical lens 2;

[0027] 4. Place the lower surface of the cylindrical mold 4 on the upper curvature surface of the biconvex cylindrical lens 2, press the pressure head into the central V-shaped groove on the upper surface of the cylindrical mold 4, and start the pressure head to drive the cylindrical mold 4 to grind the upper curvature surface of the biconvex cylindrical lens 2.

Claims

1. A clamping and locking mechanism for a biconvex cylindrical lens, characterized in that: The invention comprises a lower fixture (1), an upper fixture (3) and a mould (4), wherein a biconvex cylindrical lens (2) is placed on the lower fixture (1), and the upper fixture (3) and the lower fixture (1) are screwed together to fix the biconvex cylindrical lens (2) on the lower fixture (1), the upper fixture (3) is a hollow tubular structure, the upper end of the inner wall of the upper fixture (3) is in contact with the edge of the upper curvature surface of the biconvex cylindrical lens (2), the lower surface of the mould (4) is in contact with the upper curvature surface of the biconvex cylindrical lens (2), and the upper curvature surface of the convex cylindrical lens (2) is ground.

2. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 1, characterized in that: The lower part of the lower clamp (1) is a cylindrical handle, and the upper part is hollow. The upper end surface is provided with a step that sinks into the inner cavity and is used to place the lower curvature surface of the biconvex cylindrical lens (2), and the upper curvature surface of the biconvex cylindrical lens (2) protrudes from the upper end surface of the lower clamp (1).

3. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 2, characterized in that: The upper end surface of the lower clamp (1) is provided with a groove cut downwards along its radial direction.

4. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 2, characterized in that: The upper outer ring of the lower clamp (1) is provided with a thread, and the upper end of the thread is a slope contracting inwards from the upper end surface.

5. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 4, characterized in that: The lower part of the inner wall of the upper clamp (3) is provided with a thread adapted to the outer ring of the upper part of the lower clamp (1), and the upper part of the inner wall is an inclined surface contracting inwards, the inclination angle of the inclined surface being less than or equal to the inclination angle of the upper slope of the lower clamp (1).

6. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 1, characterized in that: The mold (4) is a flat-concave cylindrical structure, and its diameter is smaller than the diameter of the biconvex cylindrical lens (2) and smaller than the inner diameter of the upper port of the upper fixture (3).

7. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 1, characterized in that: The lower surface of the mold (4) is provided with a loading layer.

8. The clamping and locking mechanism for a biconvex cylindrical lens according to claim 1, characterized in that: A V-shaped groove for accommodating a pressure head is provided at the center of the upper surface of the mold (4).

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