A lens thickness and edge thickness difference measuring device

Abstract

The utility model discloses a kind of lens thickness and edge thickness difference measuring devices, including base, lens fixture on base, the thickness gauge of measuring to lens, the fixed frame of suspending thickness gauge in lens fixture center, the lens fixture includes cylindrical jig, cylindrical jig includes inner cavity, inner cavity is provided with the step of size gradually decreasing in axial direction to base direction, for placing different size lens, the lower end of thickness gauge is telescopic measuring rod, and thickness gauge is rotatable and fixed relative to thickness gauge fixed frame. The device is simple in structure, by designing the cylindrical jig of multiple decreasing recess step surface, different size lens can be quickly adapted, the time of replacing jig is reduced;At the same time, by rotating thickness gauge, the center thickness and edge thickness of lens can be conveniently measured, to improve measurement efficiency;Finally in the process of measurement, the contact area of lens and bearing can also be reduced as far as possible, to further protect the surface quality of lens.

Description

Technical Field

[0001] This utility model relates to lens measurement technology, and in particular to a lens thickness and edge thickness difference measuring device. Background Technology

[0002] Lenses require thickness and edge thickness variation measurement during all cold processing steps. Larger lenses are relatively heavier, placing greater stress on the lens-bearing surface of the measuring device during measurement. This makes the lens surface prone to scratches during handling, affecting surface quality. Excessive vertical movement of the measuring rod on the thickness gauge also impacts its accuracy and lifespan. Furthermore, larger lens diameters require greater lateral space for measurement, which small measuring devices often cannot meet. Additionally, the variety of lens sizes, such as the numerous diameters of circular lenses, necessitates the use of different sized fixtures, increasing costs. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a lens thickness and edge thickness difference measuring device that is simple in structure, easy to operate, can reduce scratches on the lens surface, and is applicable to the measurement of lenses of various sizes.

[0004] Technical solution: The lens thickness and edge thickness difference measuring device of this utility model includes a base, a lens fixture located on the base, a thickness gauge for measuring the lens, and a fixing frame for suspending the thickness gauge in the center of the lens fixture. The lens fixture includes a cylindrical fixture with an inner cavity. The inner cavity has steps of progressively decreasing size in the axial direction towards the base for placing lenses of different sizes. The lower end of the thickness gauge is a retractable measuring rod, and the thickness gauge can rotate and be fixed relative to the thickness gauge fixing frame.

[0005] The cylindrical fixture has symmetrical slots on both sides, with the slots extending to the lowest step.

[0006] The base is provided with a positioning structure between it and the lens fixture.

[0007] The fixing frame includes a horizontal bar and a vertical bar, wherein one end of the horizontal bar is movably connected to the thickness gauge, and the other end of the horizontal bar is fixedly connected to the vertical bar.

[0008] The vertical rod includes a lower rod and an upper rod. The lower rod is fixed on the base, and the upper rod is movably connected to the upper section of the lower rod. The upper rod can move up and down and be fixed on the axis relative to the lower rod. The other end of the horizontal rod is fixedly connected to the upper rod.

[0009] The inner cavity of the cylindrical fixture is a circular step suitable for a circular lens or a square step suitable for a square lens.

[0010] The lens fixture also includes a right-angle piece for positioning the square lens on the upper surface of the base.

[0011] The right-angle piece is made of two long strips with square cross-sections joined together, forming a right angle at the joint.

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

[0013] 1. This device has a simple structure. By designing cylindrical fixtures with various decreasing groove step surfaces, it can quickly adapt to lenses of different sizes, reducing the time for changing fixtures. At the same time, by rotating the thickness gauge, the center thickness and edge thickness of the lens can be easily measured, thereby improving measurement efficiency.

[0014] 2. During the measurement process, the contact area between the lens and the carrier can be minimized as much as possible, further protecting the surface quality of the lens. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this device. Detailed Implementation

[0016] like Figure 1 As shown, the measuring device of this utility model includes a base 1, a cylindrical fixture 2, a thickness gauge 3, a thickness gauge fixing frame 4, and a right-angle piece 5.

[0017] The base 1 has a certain thickness and its upper and lower surfaces are smooth and flat. The preferred material for the base is marble.

[0018] The cylindrical fixture 2 includes an inner ring with multiple steps of decreasing diameter along its axial direction (from the upper end face to the lower end face that contacts the upper surface of the base 1). This design of multiple steps with varying diameters allows for the support of lenses of different diameters, placing them on the upper surface of the base 1 while preventing direct contact between the lenses and the base 1. It is also suitable for lenses of various diameters. To facilitate lens handling, symmetrical slots are provided on both sides of the cylindrical fixture 2, extending to the lowest step. The fixture is made of metal, preferably copper.

[0019] The right-angle piece 5 is used to position the square lens on the upper surface of the base 1. The right-angle piece 5 is made of two long strips with square cross-sections joined together, forming a right angle. In use, the square lens can be positioned at the right angle. The right-angle piece 5 is made of glass.

[0020] Thickness gauge 3 is mounted above cylindrical fixture 2 or right-angle piece 5 via mounting bracket 4. The lower end of the measuring rod of thickness gauge 3 is either pointed or flat; the pointed end is mainly used for measuring the concave surface of a lens, while the flat end is mainly used for measuring the convex surface of a lens. The measuring rod is made of plastic, preferably PVC.

[0021] The mounting bracket 4 includes a horizontal bar and a vertical bar. One end of the horizontal bar is movably connected to the thickness gauge 3, and the other end is fixedly connected to the vertical bar. The vertical bar includes a lower bar and an upper bar. The lower bar is fixed to the base 1, and the upper bar is movably connected to the upper section of the lower bar. The upper bar can move up and down and be fixed relative to the lower bar on an axis (e.g., the thickness gauge 3 has a through hole and is fixed to the horizontal bar with screws, and the upper bar has a vertical slotted hole and is fixed to the lower bar with screws). The other end of the horizontal bar is fixedly connected to the upper bar. With this structural design, the measuring rod can rotate relative to the horizontal bar along with the thickness gauge 3, allowing the measuring rod to be aligned not only with the center of the lens but also with the edge surface of the lens, thereby enabling the measurement of the lens thickness and edge thickness difference.

[0022] To facilitate the positioning of the cylindrical fixture 2 or the right-angled piece 5 on the base 1, multiple sets of positioning posts can be provided, and corresponding positioning holes can be provided on the base 1 (the diameter of the positioning hole can be 0.05mm smaller than that of the positioning post). Note that the diameter of the positioning hole of the cylindrical fixture 2 should be smaller than the side length of the square lens to be measured to prevent the square lens from falling into the positioning hole.

[0023] Correspondingly, the right-angled piece 5 for the square lens can also be replaced with a cylindrical fixture that carries the square lens. The cylindrical fixture has a structure similar to the cylindrical fixture 2, including a square inner ring. The square inner ring has multiple steps with successively decreasing diameters in the axial direction to carry square lenses of different sizes. Similarly, the cylindrical fixture also has symmetrical slots on both sides, with the slot depth extending to the lowest step.

[0024] It is worth noting that during the device manufacturing process, the positions of the positioning holes and the fixing frame 4 can be pre-designed so that when the measuring rod hangs vertically downwards during use, it can correspond to the center of the lens.

[0025] The work process is as follows:

[0026] 1. Measuring the thickness of a circular lens: Place a standard part (such as a convex lens) with a thickness of a on a suitable step surface in a cylindrical fixture 2 (or cylindrical fixture). Assemble the cylindrical fixture 2 onto the base plate 1. Then adjust the height of the measuring rod so that it contacts the center of the standard part. At this time, reset the value of the thickness gauge 3 to zero. The height of the measuring rod remains unchanged. Remove the standard part by rotating the thickness gauge 3.

[0027] Place the convex lens to be tested into the cylindrical fixture 2, on the same step surface as the standard part. The measuring rod hangs vertically downward and contacts the center of the convex lens. Read the value b from the thickness table 3, add it to or subtract it from the thickness of the standard part, and obtain the thickness of the convex lens to be tested.

[0028] 2. Measuring the edge thickness difference of a circular lens: The lens assembly process is the same as above. Rotate the thickness gauge 3 to a certain angle and fix it so that the measuring rod contacts the edge of the lens. Select the measurement point on the edge of the lens and rotate the lens in sequence (at least one revolution). The maximum difference between the readings of multiple measurement points is the edge thickness difference of the lens.

[0029] 3. Measuring the thickness of a square lens: The measurement process is the same as that of a circular lens, except that the square lens is placed at the right angle of the right-angle piece 5 or in a cylindrical fixture to measure the thickness of the square lens.

[0030] Place the convex lens to be tested into the cylindrical fixture 2, on the same step surface as the standard part. The measuring rod hangs vertically downward and contacts the center of the convex lens. Read the value b from the thickness table 3, add it to or subtract it from the thickness of the standard part, and obtain the thickness of the convex lens to be tested.

[0031] 4. Measuring the edge thickness difference of a square lens: The measurement process is the same as that of a circular lens. The difference is that the square lens is placed at the right angle of the right-angle piece 5 or in the cylindrical fixture. The measurement points on the edge of the lens are selected as the four corners. The maximum difference between the readings of the measurement points is the edge thickness difference of the lens.

Claims

1. A lens thickness and edge thickness difference measuring device, characterized in that, The device includes a base (1), a lens fixture located on the base (1), a thickness gauge (3) for measuring the lens, and a mounting bracket (4) for suspending the thickness gauge (3) at the center of the lens fixture. The lens fixture includes a cylindrical fixture with an inner cavity. The inner cavity has steps of progressively decreasing size in the axial direction towards the base (1) for placing lenses of different sizes. The lower end of the thickness gauge (3) is a retractable measuring rod. The thickness gauge (3) can rotate and be fixed relative to the mounting bracket (4).

2. The lens thickness and edge thickness difference measuring device according to claim 1, characterized in that, The cylindrical fixture has symmetrical slots on both sides, with the slot depth extending to the lowest step.

3. The lens thickness and edge thickness difference measuring device according to claim 1, characterized in that, A positioning structure is provided between the base and the lens fixture.

4. The lens thickness and edge thickness difference measuring device according to claim 1, characterized in that, The fixing frame (4) includes a horizontal bar and a vertical bar, wherein one end of the horizontal bar is movably connected to the thickness gauge (3), and the other end of the horizontal bar is fixedly connected to the vertical bar.

5. The lens thickness and edge thickness difference measuring device according to claim 4, characterized in that, The vertical rod includes a lower rod and an upper rod. The lower rod is fixed on the base (1), and the upper rod is movably connected to the upper section of the lower rod. The upper rod can move up and down and be fixed on the axis relative to the lower rod. The other end of the horizontal rod is fixedly connected to the upper rod.

6. The lens thickness and edge thickness difference measuring device according to claim 1, characterized in that, The inner cavity of the cylindrical fixture is a circular step suitable for circular lenses or a square step suitable for square lenses.

7. The lens thickness and edge thickness difference measuring device according to claim 1, characterized in that, The lens fixture also includes a right-angle piece (5) for positioning the square lens on the upper surface of the base (1).

8. The lens thickness and edge thickness difference measuring device according to claim 7, characterized in that, The right-angle piece (5) is made of two long strips with square cross sections spliced ​​together, forming a right angle at the splice.

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