Lens thickness measuring device

Abstract

The utility model discloses a lens thickness measuring device which comprises a measuring table, an adhesive tool is fixed on the measuring table, the upper end of the adhesive tool is a cambered surface, the cambered surface is attached to a non-machined curved surface of a lens to be measured, and a through hole is formed in the center of the adhesive tool; a first digital display thickness meter is erected on the measuring table, a measuring rod of the first digital display thickness meter penetrates through the through hole to be in contact with the center of the non-machined curved surface of the lens to be measured, a second digital display thickness meter is further erected above the gluing tool, and a measuring rod of the second digital display thickness meter is in contact with the center of the machined curved surface of the lens to be measured. The utility model solves the problems that the appearance of the lens is influenced and the measurement accuracy and efficiency are low because the lens thickness measurement is repeatedly disassembled in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of lens measurement, in particular to a lens thickness measuring device. Background Art

[0002] At present, one curvature surface of a cylindrical aspheric lens is a spherical surface, and the other curvature surface is an aspheric surface. During the R opening (a similar curvature is opened according to the surface characteristics of the aspheric surface, and the curvature can envelope the aspheric surface) and fine grinding and polishing processes of the aspheric surface, the thickness of the lens needs to be repeatedly measured to ensure that the thickness of the lens after processing meets the requirements.

[0003] At present, the method of measuring the thickness of the lens during processing is as follows: first measure the original thickness of the lens to be processed, and estimate the necessary cutting allowance based on this. Then stick the lens on the fixing seat, and install the fixing seat on the grinding machine. According to the previously calculated cutting amount, adjust the machine parameters to accurately grind the lens.

[0004] In order to directly measure the thickness of the lens after grinding, it is necessary to remove the lens for testing after grinding. If the thickness does not meet the predetermined requirements, the previous pasting and grinding process needs to be repeated. However, this multiple loading and unloading process may cause damage to the lens surface, which not only reduces the processing efficiency but also increases the risk of damage to the lens surface. In addition, it is also difficult to ensure that the two centers of curvature are coaxial with the fixing seat every time the lens is re-pasted, which can easily introduce measurement errors, thereby affecting the precise control of the lens thickness.

[0005] In order to improve lens processing efficiency and measurement accuracy while reducing potential damage to the lens surface, the existing processing-measurement methods need to be adjusted. Utility Model Content

[0006] Purpose of the utility model: The purpose of the utility model is to provide a lens thickness measuring device which does not require repeated disassembly and assembly of the lens and has high measurement accuracy and effect.

[0007] Technical solution: To achieve the above-mentioned purpose, the utility model provides a lens thickness measuring device, including a measuring table, on which a glue tool is fixed, the upper end of the glue tool is an arc surface, the arc surface fits with the non-machined curved surface of the lens to be measured, and the center of the glue tool has a through hole; a first digital thickness gauge is mounted on the measuring table, and a measuring rod of the first digital thickness gauge passes through the through hole and touches the center of the non-machined curved surface of the lens to be measured, and a second digital thickness gauge is also mounted above the glue tool, and the measuring rod of the second digital thickness gauge touches the center of the machined curved surface of the lens to be measured.

[0008] Wherein, a sink is provided on the measuring platform, and matching threads are provided on the side wall of the sink and the lower end of the gluing tool, and the gluing tool is fixed in the sink through the threaded fit.

[0009] A through hole for fixing a cylindrical rod of a first digital thickness gauge is provided at the center of the sink, wherein one end of the cylindrical rod is connected to the dial, and a measuring rod of the first digital thickness gauge extends out or retracts from the other end of the cylindrical rod, and a thread is provided on the outer ring of the cylindrical rod, so that the first digital thickness gauge is fixed at the through hole by two sets of nuts cooperating with the thread.

[0010] Wherein, the second digital thickness gauge is arranged above the gluing tool through a bracket, and the bracket is fixed on the measuring table.

[0011] Wherein, the measuring rods of the first digital thickness gauge and the second digital thickness gauge are coaxial in the vertical direction.

[0012] Wherein, the non-processed curved surface of the lens to be tested is glued to the upper curved surface of the gluing tool.

[0013] Beneficial effects: The utility model has the following advantages: 1. The lens of the device is pasted on the bonding tool, and the bonding tool is used to fix the lens on the measuring table or grinding machine. The bonding tool has a through hole in the center, which can realize direct measurement of the thickness of the lens without repeatedly disassembling and assembling the lens, thereby reducing damage to the appearance of the lens;

[0014] 2. After the device adjusts the positions of the two sets of digital thickness gauges for the first time, there is no need to repeatedly adjust the positions of the lens or the digital thickness gauges in subsequent operations. The measuring head of the digital thickness gauge can always touch the center of the upper and lower surfaces of the lens, ensuring the measurement accuracy and efficiency of the lens thickness;

[0015] 3. The measuring heads of the two sets of digital thickness gauges in this device directly contact the center of the upper and lower surfaces of the lens, respectively, to achieve direct measurement of the lens thickness without the need for other measuring tools. This not only simplifies the measurement process, but also reduces the errors that may be caused by indirect measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the device. 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 1As shown, the lens thickness measuring device described in the utility model can fix the lens 3 to be measured, and use two sets of digital thickness gauges to measure the lens 3 multiple times until the lens 3 meets the center thickness requirement after processing. The measuring device includes a measuring table 1, a gluing tool 2, a first digital thickness gauge 4, a second digital thickness gauge 5, and a bracket 6. Among them, a sink 1.1 is provided on the measuring table 1, the gluing tool 2 is cylindrical, and the side wall of the sink 1.1 and the lower end of the gluing tool 2 are provided with matching threads, and the gluing tool 2 is fixed in the sink 1.1 by threaded cooperation. The upper end of the gluing tool 2 is a curved surface, and the curved surface fits the non-processed curved surface of the lens 3 to be measured. The measuring table 1 is provided with a sink 1.1,

[0019] The lens 3 to be tested is a cylindrical lens 3, one of which is machined into a non-spherical surface that meets the requirements, and the other is a spherical surface. During the machining process, the center thickness 3 of the lens 3 to be tested needs to be measured multiple times to ensure that the center thickness of the lens 3 after machining meets the requirements. Therefore, the non-machined curved surface of the lens 3 to be tested is pasted on the curved surface, so that when the lens 3 is machined, it is only necessary to fix the adhesive tool 2 on the grinding machine and use the grinding rod to grind the machined curved surface of the lens 3 to be tested. At the same time, if it is necessary to measure the thickness of the lens 3, it is only necessary to remove the adhesive tool 2 from the grinding machine and place it in the sink 1.1 of the measuring table 1. This structural design can reduce contact with the lens 3. During the machining-measurement process, it is only necessary to disassemble and assemble the adhesive tool 2, thereby avoiding multiple disassembly and assembly of the lens 3, which may cause scratches on the surface of the lens 3, and also improve the machining-measurement efficiency.

[0020] The sink 1.1 and the center of the gluing tool 2 are provided with a through hole, the through hole on the sink 1.1 is used to fix the first digital thickness gauge 4, and the through hole on the first digital thickness gauge 4 is used to pass the measuring rod of the first digital thickness gauge 4, so that the measuring head of the measuring rod of the first digital thickness gauge 4 touches the center of the non-processed curved surface (the lower surface pasted with the curved surface) of the lens 3 to be measured. The specific implementation method is: a cylindrical rod with an outer circle thread is fixed at the lower end of the instrument panel of the first digital thickness gauge 4, and the measuring rod of the first digital thickness gauge 4 can extend or retract from the other end of the cylindrical rod. The first digital thickness gauge 4 is fixed to the through hole on the sink 1.1 by two sets of nuts on the outer circle of the cylindrical rod that cooperate with the thread.

[0021] The second digital thickness gauge 5 is arranged above the gluing tool 2 via a bracket 6, and the bracket 6 is fixed on the measuring platform 1. The measuring rods of the first digital thickness gauge 4 and the second digital thickness gauge 5 are coaxial in the vertical direction.

[0022] The bracket 6 includes a vertical rod and a horizontal rod. The vertical rod is riveted to the measuring platform 1 by screws, and the horizontal rod is riveted to the top of the vertical rod by screws and is set at 90° with the vertical rod. The second digital thickness gauge 5 is fixed to one end of the horizontal rod, and the measuring rod of the second digital thickness gauge 5 is vertically downward.

[0023] When it is necessary to adjust the position of the second digital thickness gauge 5, the screws can be loosened appropriately to adjust the position of the vertical rod or the horizontal rod relative to the measuring platform 1, so as to adjust the measuring rod of the second digital thickness gauge 5 to be directly above the center of the gluing tool 2. When the upper end surface of the gluing tool 2 is pasted with the lens 3, the measuring head of the measuring rod of the second digital thickness gauge 5 can also touch the center of the processed curved surface of the lens 3 to be measured (the upper surface of the lens 3).

[0024] The device uses the measuring table 1 to limit the bonding tool. After the positions of the first digital thickness gauge 4 and the second digital thickness gauge 5 are adjusted, there is no need to repeatedly adjust the position of the lens 3 in subsequent operations, so that the measuring heads of the two measuring rods can always touch the center of the upper and lower surfaces of the lens 3, thereby ensuring the absolute measurement accuracy of the thickness of the lens 3.

[0025] The device enables the measuring rods of the two sets of digital thickness gauges to directly contact the centers of the upper and lower surfaces of the lens 3 respectively, thereby realizing direct measurement of the thickness of the lens 3 without the need for other measuring tools.

[0026] Working principle: 1) Adjustment device

[0027] Fix the first digital thickness gauge 4 on the measuring table 1, and fix the second digital thickness gauge 5 on the top of the sink 1.1 through the bracket 6; stick the lower surface (non-processed surface) of the lens 3 to be measured on the arc surface of the bonding tool, and place the bonding tool in the sink 1.1; adjust the vertical position of the first digital thickness gauge 4 so that the measuring head of the measuring rod of the first digital thickness gauge 4 contacts the center of the lower surface of the lens 3, and the downward compression amount at the measuring head is about 0.1mm, and at this time, the first digital thickness reading value is returned to "0".

[0028] Take out the bonding tool from the measuring table 1, and adjust the vertical rod and the horizontal rod of the bracket 6 at the same time, so that the measuring rod of the second digital thickness gauge 5 is vertically downward, and the measuring heads of the two sets of digital thickness gauge measuring rods are aligned and pressed tightly (vertically abutting against each other). At this time, the second digital thickness reading value is returned to "0".

[0029] 2) Thickness measurement of lens 3 before processing

[0030] At this time, the positions of the two sets of digital thickness gauges are both fixed. Pull up the measuring rod of the second digital thickness gauge 5, put the bonding tool with the lens 3 attached into the sink 1.1, put down the measuring rod of the second digital thickness gauge 5, and slightly shake the measuring table 1 to make the measuring heads of the two measuring rods fully contact with the lens 3. At this time, the thickness A of the lens 3 = the reading of the second digital thickness gauge 5 ± the reading of the first digital thickness gauge 4 (when the reading of the first digital thickness gauge 4 is negative, take -, when it is positive, take +)

[0031] 3) Thickness measurement of lens 3 after processing

[0032] According to the difference between the measured thickness A of the lens 3 and the target thickness, the processing parameters of the grinding machine are adjusted, the bonding tool is taken out from the device, fixed on the grinding machine, the machine is started, and the upper surface of the lens 3 is processed. After the preliminary processing is completed, step 2 is repeated to measure the lens 3 after the preliminary processing to obtain the thickness B of the lens 3. If the thickness B of the lens 3 meets the target thickness requirement, the processing is stopped. If it does not meet the requirement, step 3 is repeated until the requirement is met.

Claims

1. A lens thickness measuring device, characterized in that: The measuring platform (1) comprises a measuring table (1), on which a gluing tool (2) is fixed, the upper end of the gluing tool (2) is a curved surface, the curved surface is in contact with the non-machined curved surface of the lens (3) to be measured, and the center of the gluing tool (2) has a through hole running through it; a first digital thickness gauge (4) is mounted on the measuring table (1), a measuring rod of the first digital thickness gauge (4) passes through the through hole and touches the center of the non-machined curved surface of the lens (3) to be measured, and a second digital thickness gauge (5) is mounted above the gluing tool (2), and the measuring rod of the second digital thickness gauge (5) touches the center of the machined curved surface of the lens (3) to be measured.

2. The lens thickness measuring device according to claim 1, characterized in that: The measuring platform (1) is provided with a sink (1.1), and the side wall of the sink (1.1) and the lower end of the gluing tool (2) are provided with matching threads, and the gluing tool (2) is fixed in the sink (1.1) through thread matching.

3. The lens thickness measuring device according to claim 2, characterized in that: A through hole for fixing a cylindrical rod of a first digital thickness gauge (4) is provided at the center of the sink (1.1), wherein one end of the cylindrical rod is connected to the dial, and a measuring rod of the first digital thickness gauge (4) extends out or retracts from the other end of the cylindrical rod, and a thread is provided on the outer ring of the cylindrical rod, so that the first digital thickness gauge (4) is fixed at the through hole by two sets of nuts matching the thread.

4. The lens thickness measuring device according to claim 1, characterized in that: The second digital thickness gauge (5) is arranged above the gluing tool (2) via a bracket (6), and the bracket (6) is fixed on the measuring platform (1).

5. The lens thickness measuring device according to claim 1, characterized in that: The measuring rods of the first digital thickness gauge (4) and the second digital thickness gauge (5) are coaxial in the vertical direction.

6. The lens thickness measuring device according to claim 1, characterized in that: The non-processed curved surface of the lens to be tested (3) is glued to the upper curved surface of the gluing tool (2).

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