High-precision lens assembly adjusting device and method

Abstract

The invention relates to the field of optical adjustment testing, in particular to a high-precision lens assembly adjustment device and method, and the method comprises the steps: grinding the height size of each space ring; fixing the lens cone on the centering adjustment table, and enabling the central axis of the lens cone to be consistent with the rotation axis of the centering adjustment table; the first space ring and the first lens component are sequentially arranged in the lens barrel, and the center deviation and the angle deviation of the lens component are measured; adjusting the centroid deviation and the angular deviation of the lens component to enable the centroid deviation and the angular deviation of the lens component to meet the design precision; sequentially installing each lens component and each space ring, and adjusting the center deviation and the angle deviation of the lens component; and fastening all the space rings and all the lens components until all the lens components and all the space rings are installed and adjusted, and completing the installation and adjustment of the lens group. According to the invention, the adjustment precision of the lens group can be effectively improved.

Description

Technical Field

[0001] The invention relates to the field of optical assembly and adjustment testing, and in particular to a high-precision lens assembly and adjustment device and method. Background Art

[0002] The lens group is one of the most common optical units in the optical system, which consists of a lens barrel, multiple lens components, multiple spacers and pressure rings. Usually, the angular deviation and center deviation accuracy of each lens component are guaranteed by the lens component centering device or centering car and the small gap between the lens component and the lens barrel, and the interval between the lens components is controlled by the thickness of the spacer.

[0003] Existing adjustment methods include centering installation and centering car. The accuracy of centering installation is limited by the machining accuracy such as the cylindricity and flatness of the lens holder itself and the optical accuracy of the lens itself, and can only adjust the center deviation and angular deviation of the lens component. Although the centering car can adjust the center deviation and angular deviation of the lens component at the same time, the accuracy of the centering car is affected by the deterioration of the flatness of the truncation surface and the cylindricity of the outer cylindrical surface during truncation by the centering car. At the same time, each lens component is tightly fitted with a small gap in the lens barrel. This gap not only affects the center deviation accuracy of the lens component, but also results in no adjustment space for the lens component in the lens barrel; although the thickness of the spacer can ensure the air spacing of each lens unit, the parallelism of the spacer itself affects the angular deviation accuracy between the lens components. For high-precision visible light optical systems, the adjustment accuracy of traditional adjustment methods cannot meet the design requirements.

[0004] Therefore, it is necessary to provide a high-precision lens assembly adjustment device and method to solve the above problems. Summary of the invention

[0005] The present invention provides a high-precision lens assembly and adjustment device and method, which are used to solve the problem of low lens assembly and adjustment accuracy caused by low lens component centering and centering car accuracy, low spacer parallelism accuracy and imperfect assembly method of lens components and lens barrels.

[0006] A high-precision lens assembly adjustment device of the present invention adopts the following technical solution, including: A base, on which a centering adjustment table is arranged, which is used to fix the lens barrel; And the inner focusing light tube is vertically arranged just above the centering and adjusting platform through a supporting frame, and the rotation center of the centering and adjusting platform and the center of the inner focusing light tube are collinear.

[0007] Preferably, the support frame comprises: a support rod vertically arranged on the base, a horizontally arranged connecting rod is arranged on the top of the support rod, wherein the inner focusing light tube is arranged on the connecting rod.

[0008] Preferably, a micrometer is provided on the support rod on the side close to the centering and adjusting platform, and the micrometer is used to measure the distance between the center of the lens barrel and the support rod.

[0009] A high-precision lens assembly adjustment method, comprising: Step 1: Grind the height of each spacer according to the height of each lens component and the height of each spacer to ensure that the interval between the central vertices of two adjacent lens components meets the interval error range; Step 2: Fix the lens barrel on the centering adjustment table so that the central axis of the lens barrel is consistent with the rotation axis of the centering adjustment table; Step 3, install the first spacer and the first lens component into the lens barrel in sequence, and use the internal focusing light tube to measure the center deviation and angular deviation of the lens component; adjust the center deviation of the lens component by the adjustment screw on the lens barrel, and tilt the spacer to adjust the angular deviation of the lens component, so that the center deviation and angular deviation of the lens component meet the design accuracy; Step 4, according to step 3, each lens component and each spacer are installed in sequence, and the center offset and angular offset of the lens component are adjusted; Step 5: After all lens components and each spacer are installed and adjusted, tighten all spacers and all lens components to complete the adjustment of the lens group.

[0010] Preferably, the step of making the position of the lens barrel so that the central axis of the lens barrel is consistent with the rotation axis of the centering and adjusting platform is: Use a micrometer to measure the inner cylindrical surface runout of the lens barrel and the end runout of the lens component mounting surface; The translation and tilt of the lens barrel are adjusted through the centering and adjusting platform to minimize the radial runout of the inner cylindrical surface of the lens barrel and the end runout of the lens component mounting surface. At this time, the central axis of the lens barrel is consistent with the rotation axis of the centering and adjusting platform.

[0011] Preferably, all spacers and all lens components are secured using a clamping ring.

[0012] Preferably, the interval between the central vertices of the two lens components has an interval error range of ±0.01 mm.

[0013] Preferably, the design accuracy of the center offset and the angular offset of the lens component is: the center offset of the lens component is less than or equal to 0.01 mm, and the angular offset of the lens component is less than or equal to 5".

[0014] Preferably, a height dimension of each lens component and a height dimension of each spacer are measured on an optical table using a height gauge.

[0015] Preferably, a large clearance fit of 0.1 mm is adopted when the lens component and the lens barrel are assembled.

[0016] The beneficial effects of the present invention are: The lens component and the lens barrel are designed to fit with a large gap, and the center eccentricity of the lens component is adjusted by translating the lens component and adjusting the angular deflection of the lens component by tilting the spacer in the lens barrel; the thickness of the spacer is first ground to ensure that the spacing between the lens components is within the spacing error, and then the thickness change of the spacer when the spacer is tilted can still ensure that the spacing between the lens components is within the spacing error; the combination of the two can effectively improve the adjustment accuracy of the lens group, and this method can be applied to the adjustment of high-precision optical systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a high-precision lens assembly adjustment device; Figure 2 It is a schematic diagram of the measurement of lens components and spacer ring dimensions; Figure 3 It is a schematic diagram of the lens group.

[0019] In the figure: 1. Internal focusing light tube; 2. Centering and adjusting stage; 3. Altimeter; 4. Micrometer; 5. Optical platform; 6. Lens group; 7. Adjusting screw; 8. Lens barrel; 9. Lens component; 10. Spacer; 11. Pressure ring; 12. Center axis; 13. Rotation axis. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] An embodiment of a high-precision lens assembly adjustment device of the present invention is as follows Figure 1 As shown, it includes: a base, a centering and adjusting platform 2, and an internal focusing light tube 1. The centering and adjusting platform 2 is arranged on the base and is used to fix the lens barrel 8; the internal focusing light tube 1 is vertically arranged directly above the centering and adjusting platform 2 through a supporting frame, and the rotation center of the centering and adjusting platform 2 and the center of the internal focusing light tube 1 are collinear.

[0022] The support frame includes: a support rod vertically arranged on the base, a horizontally arranged connecting rod is arranged on the top of the support rod, and the inner focusing light tube 1 is arranged on the connecting rod.

[0023] Among them, in order to facilitate the adjustment of the position of the lens barrel 8 so that the central axis 12 of the lens barrel 8 is consistent with the rotation axis 13 of the centering and adjusting platform 2, in this embodiment, a micrometer 4 is provided on the support rod on the side close to the centering and adjusting platform 2, and the micrometer 4 is used to measure the distance between the center of the lens barrel 8 and the support rod.

[0024] An embodiment of a high-precision lens assembly adjustment method of the present invention comprises the following specific steps: Step 1: Figure 2 As shown, the height dimension of each lens component 9 and the height dimension of each spacer 10 are measured by using a altimeter 3 on the optical platform 5. According to the height dimension of each lens component 9 and the height dimension of each spacer 10, the height dimension of each spacer 10 is ground to ensure that the interval between the central vertices of two adjacent lens components 9 meets the interval error range. The interval error range between the central vertices of two lens components 9 is ±0.01mm.

[0025] Step 2, fix the lens barrel 8 on the centering and adjusting platform 2, and use the micrometer 4 to measure the inner cylindrical surface diameter runout of the lens barrel 8 and the end runout of the mounting surface of the lens component 9; adjust the translation and tilt of the lens barrel 8 through the centering and adjusting platform 2 to minimize the inner cylindrical surface diameter runout of the lens barrel 8 and the end runout of the mounting surface of the lens component 9. At this time, the central axis 12 of the lens barrel 8 is consistent with the rotation axis 13 of the centering and adjusting platform 2.

[0026] Step 3, install the first spacer 10 and the first lens component 9 into the lens barrel 8 in sequence, wherein the lens component and the lens barrel are assembled with a large clearance of 0.1 mm, and use the internal focusing light tube 1 to measure the center deviation and angular deviation of the lens component 9; adjust the center deviation of the lens component 9 by the adjusting screw 7 on the lens barrel 8, and tilt the spacer 10 to adjust the angular deviation of the lens component 9, so that the center deviation and angular deviation of the lens component 9 meet the design accuracy, and the design accuracy of the center deviation and angular deviation of the lens component 9 is: the center deviation of the lens component 9 is less than or equal to 0.01 mm, and the angular deviation of the lens component 9 is less than or equal to 5".

[0027] Step 4, install each lens component and each spacer in sequence according to step 3, and adjust the eccentricity and angular offset of the lens component, that is, complete the adjustment of the eccentricity and angular offset of the second spacer 10 and the second lens component 9, the third spacer 10 and the third lens component 9, ..., the last spacer 10 and the last lens component 9 in sequence according to step 3.

[0028] Step 5: After all lens components and each spacer are installed and adjusted, use the pressure ring 11 to tighten all the spacers 10 and all lens components 9 to complete the adjustment of the lens group 6. The lens group 6 after adjustment is as shown in FIG. Figure 3 shown.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision lens assembly adjustment device, characterized in that: include: A base, on which a centering adjustment table is arranged, which is used to fix the lens barrel; And the inner focusing light tube is vertically arranged just above the centering and adjusting platform through a supporting frame, and the rotation center of the centering and adjusting platform and the center of the inner focusing light tube are collinear.

2. A high-precision lens assembly adjustment device according to claim 1, characterized in that: The support frame includes: A support rod is vertically arranged on the base, and a horizontally arranged connecting rod is arranged on the top of the support rod, wherein the inner focusing light tube is arranged on the connecting rod.

3. A high-precision lens assembly adjustment device according to claim 2, characterized in that: A micrometer is arranged on the support rod on one side close to the centering and adjusting platform, and the micrometer is used to measure the distance between the center of the lens barrel and the support rod.

4. A high-precision lens assembly adjustment method, characterized in that: include: Step 1: Grind the height of each spacer according to the height of each lens component and the height of each spacer to ensure that the interval between the central vertices of two adjacent lens components meets the interval error range; Step 2: Fix the lens barrel on the centering adjustment table so that the central axis of the lens barrel is consistent with the rotation axis of the centering adjustment table; Step 3, install the first spacer and the first lens component into the lens barrel in sequence, and use the internal focusing light tube to measure the center deviation and angular deviation of the lens component; adjust the center deviation of the lens component by the adjustment screw on the lens barrel, and tilt the spacer to adjust the angular deviation of the lens component, so that the center deviation and angular deviation of the lens component meet the design accuracy; Step 4, according to step 3, each lens component and each spacer are installed in sequence, and the center offset and angular offset of the lens component are adjusted; Step 5: After all lens components and each spacer are installed and adjusted, tighten all spacers and all lens components to complete the adjustment of the lens group.

5. A high-precision lens assembly adjustment method according to claim 4, characterized in that: The steps to position the lens barrel so that the central axis of the lens barrel coincides with the rotation axis of the centering and adjusting stage are as follows: Use a micrometer to measure the inner cylindrical surface runout of the lens barrel and the end runout of the lens component mounting surface; The translation and tilt of the lens barrel are adjusted through the centering and adjusting platform to minimize the radial runout of the inner cylindrical surface of the lens barrel and the end runout of the lens component mounting surface. At this time, the central axis of the lens barrel is consistent with the rotation axis of the centering and adjusting platform.

6. A high-precision lens assembly adjustment method according to claim 4, characterized in that: Use the clamping ring to tighten all spacers and all lens components.

7. A high-precision lens assembly adjustment method according to claim 4, characterized in that: The interval error range between the center vertices of the two lens components is ±0.01mm.

8. A high-precision lens assembly adjustment method according to claim 4, characterized in that: The design accuracy of the center offset and angular offset of the lens component is: the center offset of the lens component is less than or equal to 0.01 mm, and the angular offset of the lens component is less than or equal to 5".

9. A high-precision lens assembly adjustment method according to claim 4, characterized in that: The height dimension of each lens component and the height dimension of each spacer are measured with a height gauge on the optical table.

10. A high-precision lens assembly adjustment method according to claim 4, characterized in that: When assembling the lens component and the lens barrel, a large clearance of 0.1 mm is used.

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