Detection system rear intercept adjusting mechanism and method

Abstract

The invention discloses a detection system rear intercept adjusting mechanism and method. The adjusting mechanism comprises a lens support, a rear intercept adjusting support, a fixing piece, an adjusting piece and a flexible hinge micro-displacement amplifying mechanism. The lens support is used for being fixedly connected with a lens. The rear intercept adjusting support is used for being fixedly connected with a detector. The lens bracket and the rear intercept adjusting bracket are integrally circular, and the outer ring of the lens bracket and the outer ring of the rear intercept adjusting bracket are concentrically and fixedly connected through a fixing piece; the flexible hinge micro-displacement amplifying mechanism is arranged on the rear intercept adjusting support, and the adjusting piece is arranged on the lens support and used for adjusting the distance between the lens support and the rear intercept adjusting support, so that the flexible hinge micro-displacement amplifying mechanism is deformed to change the rear intercept. According to the invention, efficient adjustment of the back intercept and the image plane inclination of the detection system can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of precision adjustment of detection systems, and in particular to a back intercept adjustment mechanism and method for a detection system. Background Art

[0002] The overlap of the focal plane of the optical system and the image plane of the detector in the imaging detection system is one of the necessary prerequisites to ensure clear imaging of the detection system. Due to the inevitable dimensional errors in processing, the actual value of the back intercept is usually designed to be smaller than the theoretical value, and the back intercept is adjusted by adding adjustment pads, thread adjustment, etc. to ensure clear imaging of the detection system.

[0003] The traditional detection system back-intercept adjustment method is to add adjustment pads of different thicknesses between the lens and the detector. The specific process is: in the mechanical processing stage, adjustment pads of different thicknesses are processed, usually with a minimum thickness of 20 microns; in the assembly stage, adjustment pads of different thicknesses are selected, the imaging effect is observed, and repeated iterations are performed until the requirements are met. The traditional detection system back-intercept adjustment method has obvious disadvantages: the thickness of the adjustment pad is different for each detection system, and the lens and detector need to be repeatedly disassembled and assembled, and iterative debugging is technically difficult, time-consuming, and inefficient; the back-intercept cannot be adjusted continuously, and the minimum thickness of the adjustment pad is 20 microns, and usually a deviation of a few microns will have a great impact on the imaging effect, resulting in the failure to achieve the best imaging effect; the adjustment pad processing requirements are high, and the parallelism, flatness, and surface burrs of the adjustment pad will affect the imaging of the detection system. Poor processing quality of the adjustment pad will lead to problems such as tilt of the optical axis of the detection system and inconsistent imaging clarity within the full field of view.

[0004] Patent application number 201620487674.3 is a lens position fine-tuning device for a multi-lens panoramic camera, which uses a micro-gear and rack structure to achieve axial position adjustment of multiple lenses, thereby achieving adjustment of the back focus, but there is a possibility that the optical axis cannot be guaranteed not to tilt; Patent application number 201911164348.3 is a lens and camera back focus adjustment device, which uses a coarse adjustment mechanism and a fine adjustment mechanism to adjust the back focus and image plane tilt respectively, with high adjustment accuracy, but a complex structure, and is only applicable to lens mounts with a spherical appearance; Utility model patent number 202120466430.8 is a lens back focus adjustment device, which designs a mechanism for adjusting the back focus using three sets of threads, but has a complex structure and high manufacturing cost. Summary of the invention

[0005] In view of this, the present invention provides a detection system back focus adjustment mechanism and method, which can achieve efficient adjustment of the detection system back focus and image plane tilt.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A back-intercept adjustment mechanism for a detection system, comprising a lens bracket, a back-intercept adjustment bracket, a fixing part, an adjusting part and a flexible hinge micro-displacement amplification mechanism;

[0008] The lens holder is used for fixed connection with the lens, and the back focus adjustment holder is used for fixed connection with the detector; the lens holder and the back focus adjustment holder are circular as a whole, and the outer ring of the lens holder is concentrically fixedly connected with the outer ring of the back focus adjustment holder by a fixing member; the flexible hinge micro-displacement amplification mechanism is arranged on the back focus adjustment holder, and the adjusting member is arranged on the lens holder, and is used for adjusting the distance between the lens holder and the back focus adjustment holder, so that the flexible hinge micro-displacement amplification mechanism is deformed to change the back focus.

[0009] Furthermore, the lens holder comprises a circular ring I and a lens connecting block, the lens connecting block is used to mount the lens; the lens connecting block is located at the center of the circular ring I, and the lens connecting block is fixedly connected to the circular ring I through three connecting ribs I uniformly distributed along the circumferential direction;

[0010] The back intercept adjustment bracket includes a circular ring II and a detector connecting block, the detector connecting block is used to install the detector; the detector connecting block is located at the center of the circular ring II, and the detector connecting block has three connecting ribs II evenly distributed along the circumference, and the three connecting ribs II are fixedly connected to the circular ring II through a flexible hinge micro-displacement amplification mechanism.

[0011] Furthermore, the flexible hinge micro-displacement amplification mechanism is a connecting rib III, which has a thickness less than that of the connecting rib II, and the connecting rib III is located in the extension line direction of the connecting rib II.

[0012] Furthermore, the fixing member is a fixing screw.

[0013] Furthermore, the adjusting member is an adjusting screw, and each connecting rib I on the lens bracket is provided with a threaded hole for threaded connection with the adjusting screw; a corresponding limiting groove is provided on the connecting rib II of the back focus adjustment bracket for cooperating with the adjusting screw.

[0014] Furthermore, the adjusting member also includes a locking nut, which is located between the adjusting lens bracket and the back focus adjusting bracket and is used for being threadedly connected with the adjusting screw to prevent loosening.

[0015] A detection system back intercept adjustment method adopts the above back intercept adjustment mechanism, and the adjustment method steps are as follows:

[0016] Step 1: The lens bracket and the outer ring of the back focus adjustment bracket are concentrically fixedly connected through the fixing parts, and at the same time, the three connecting ribs Ⅰ of the lens bracket are ensured to correspond to the three connecting ribs Ⅱ of the back focus adjustment bracket;

[0017] Step 2: After the lens is adjusted, install it at the front end of the lens bracket, and fix the detector at the rear end of the back focus adjustment bracket;

[0018] Step 3: The three adjustment screws are respectively threadedly connected to the connection rib I on the lens bracket. When adjusting the back intercept, the axial force acts on the connection rib II of the back intercept adjustment bracket by rotating the adjustment screws, and the flexible hinge micro-displacement amplification mechanism is deformed, that is, the back intercept changes. The imaging is observed synchronously until the imaging is clear, and the entire detection system is fixed on the collimated optical platform through the rear end of the back intercept adjustment bracket; then the image plane is tilted and corrected using the three adjustment screws;

[0019] Step 4: After the image is clear and the image plane is not tilted, tighten the locking nut on the adjustment screw and apply glue at the root of the locking nut to prevent it from loosening.

[0020] Beneficial effects:

[0021] 1. The present invention adjusts the gap between the lens bracket and the back-focus adjustment bracket through an adjusting member, so that the flexible hinge micro-displacement amplification mechanism produces directional deformation, thereby changing the distance between the lens and the detector image plane, and achieving the purpose of adjusting the back-focus of the detection system. The present invention utilizes the characteristics of the flexible hinge micro-displacement amplification mechanism, which has high motion sensitivity and deformation under force, and has the advantages of simple structure, high efficiency, high precision, small size, and continuity.

[0022] 2. In the present invention, each connecting rib I is provided with an adjusting screw, which can realize the adjustment of the back focus and the image plane tilt respectively.

[0023] 3. The present invention sets a locking nut between the lens adjustment bracket and the back focus adjustment bracket for threaded connection with the adjustment screw to prevent loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the connection between the present invention, the lens and the detector.

[0025] Figure 2 for Figure 1 Section view.

[0026] Figure 3 Schematic diagram of the rear intercept adjustment bracket.

[0027] Among them, 1-lens, 2-lens bracket, 3-back focus adjustment bracket, 4-detector, 5-fixing screw, 6-adjusting screw, 7-locking nut, 8-connecting rib III, 9-connecting rib II, 10-ring II, 11-detector connecting block. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0029] The present invention provides a back focus adjustment mechanism for a detection system, comprising a lens bracket 2, a back focus adjustment bracket 3, a fixing part, an adjusting part and a flexible hinge micro-displacement amplification mechanism.

[0030] like Figure 1 , Figure 2 As shown, the lens holder 2 is used for fixed connection with the lens 1, and the back focus adjustment holder 3 is used for fixed connection with the detector 4; the lens holder 2 and the back focus adjustment holder 3 are circular as a whole, and the outer ring of the lens holder 2 and the outer ring of the back focus adjustment holder 3 are concentrically fixedly connected by a fixing member; the flexible hinge micro-displacement amplification mechanism is arranged on the back focus adjustment holder 3, and the adjustment member is arranged on the lens holder 2, and is used for adjusting the distance between the lens holder 2 and the back focus adjustment holder 3, so that the flexible hinge micro-displacement amplification mechanism is deformed to change the back focus.

[0031] Specifically, the lens holder 2 includes a circular ring I and a lens connecting block, and the lens connecting block is used to install the lens 1; the lens connecting block is located at the center of the circular ring I, and the lens connecting block is fixedly connected to the circular ring I through three connecting ribs I uniformly distributed along the circumferential direction.

[0032] like Figure 3 As shown, the back intercept adjustment bracket 3 includes a ring II 10 and a detector connection block 11, and the detector connection block 11 is used to install the detector 4; the detector connection block 11 is located at the center of the ring II 10, and the detector connection block 11 has three connection ribs II 9 evenly distributed along the circumference, and the three connection ribs II 9 are fixedly connected to the ring II 10 through a flexible hinge micro-displacement amplification mechanism. In this embodiment, the flexible hinge micro-displacement amplification mechanism is a connection rib III 8, which has a thickness less than that of the connection rib II 9, and the connection rib III 8 is located in the direction of the extension line of the connection rib II 9. The connection ribs II 9 and III 8 are an integrated structure, with the connection rib II 9 located on the inside and the connection rib III 8 located on the outside.

[0033] The fixing member is a fixing screw 5 , and six fixing screws 5 are evenly distributed on the outer ring of the lens bracket 2 and the outer ring of the back focus adjustment bracket 3 .

[0034] The adjusting part is an adjusting screw 6, and each connecting rib I on the lens bracket 2 is provided with a threaded hole for threaded connection with the adjusting screw 6; a corresponding limiting groove is provided on the connecting rib II of the back focus adjustment bracket 3 for cooperating with the adjusting screw 6.

[0035] As an improvement, the adjustment member further comprises a locking nut 7, which is arranged between the adjustment lens bracket 2 and the back focus adjustment bracket 3, and is used for being threadedly connected with the adjustment screw 6 to prevent loosening.

[0036] The present invention also provides a method for adjusting the back intercept of a detection system, using the above-mentioned back intercept adjustment mechanism, and the adjustment method steps are as follows:

[0037] Step 1: The outer rings of the lens bracket 2 and the back focus adjustment bracket 3 are concentrically fixed and connected with six fixing screws 5. The mounting interface on the lens connecting block is concentric and coaxial with the mounting interface on the detector connecting block. At the same time, ensure that the three connecting ribs I of the lens bracket 2 correspond to the three connecting ribs II of the back focus adjustment bracket 3, and the threaded holes on the connecting ribs I correspond to the limit grooves on the connecting ribs II.

[0038] Step 2: After the lens 1 is assembled and adjusted, it is installed at the front end of the lens bracket 2, and the detector 4 is fixed at the rear end of the back focus adjustment bracket 3.

[0039] Step 3: The three adjusting screws 6 are respectively threadedly connected to the connecting ribs I on the lens bracket 2. When adjusting the back focus, by rotating the adjusting screws 6, the axial force acts on the connecting ribs II of the back focus adjustment bracket 3, and the flexible hinge micro-displacement amplification mechanism is deformed, that is, the back focus changes. The imaging is observed synchronously until the imaging is clear, and the entire detection system is fixed on the collimated optical platform through the rear end threaded hole of the back focus adjustment bracket 3; then the image plane tilt is corrected using the three adjusting screws 6;

[0040] Step 4: After the image is clear and the image plane is not tilted, tighten the locking nut 7 on the adjusting screw 6 and apply glue at the root of the locking nut 7 to prevent it from loosening.

[0041] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection system back intercept adjustment mechanism, characterized in that: It includes a lens bracket, a back focus adjustment bracket, a fixing part, an adjusting part and a flexible hinge micro-displacement amplification mechanism; The lens holder is used for fixed connection with the lens, and the back focus adjustment holder is used for fixed connection with the detector; the lens holder and the back focus adjustment holder are circular as a whole, and the outer ring of the lens holder is concentrically fixedly connected with the outer ring of the back focus adjustment holder by a fixing member; the flexible hinge micro-displacement amplification mechanism is arranged on the back focus adjustment holder, and the adjusting member is arranged on the lens holder, and is used for adjusting the distance between the lens holder and the back focus adjustment holder, so that the flexible hinge micro-displacement amplification mechanism is deformed to change the back focus.

2. The detection system back intercept adjustment mechanism according to claim 1, characterized in that: The lens bracket comprises a circular ring I and a lens connecting block, wherein the lens connecting block is used to mount the lens; the lens connecting block is located at the center of the circular ring I, and the lens connecting block is fixedly connected to the circular ring I through three connecting ribs I uniformly distributed along the circumferential direction; The back intercept adjustment bracket includes a circular ring II and a detector connecting block, the detector connecting block is used to install the detector; the detector connecting block is located at the center of the circular ring II, and the detector connecting block has three connecting ribs II evenly distributed along the circumference, and the three connecting ribs II are fixedly connected to the circular ring II through a flexible hinge micro-displacement amplification mechanism.

3. The detection system back intercept adjustment mechanism according to claim 2, characterized in that: The flexible hinge micro-displacement amplification mechanism is a connecting rib III, which has a thickness less than that of the connecting rib II, and the connecting rib III is located in the direction of the extension line of the connecting rib II.

4. The detection system back intercept adjustment mechanism according to claim 2, characterized in that: The fixing member is a fixing screw.

5. The detection system back intercept adjustment mechanism according to claim 2 or 3, characterized in that: The adjusting member is an adjusting screw, and each connecting rib I on the lens bracket is provided with a threaded hole for threaded connection with the adjusting screw; the connecting rib II of the back focus adjustment bracket is correspondingly provided with a limiting groove for cooperating with the adjusting screw.

6. The detection system back intercept adjustment mechanism according to claim 5, characterized in that: The adjusting member also includes a locking nut, which is located between the adjusting lens bracket and the back focus adjusting bracket and is used for being threadedly connected with the adjusting screw to prevent loosening.

7. A method for adjusting the back intercept of a detection system, characterized in that: Using the back focus adjustment mechanism as claimed in claim 6, the adjustment method steps are as follows: Step 1: The lens bracket and the outer ring of the back focus adjustment bracket are concentrically fixedly connected through the fixing parts, and at the same time, the three connecting ribs Ⅰ of the lens bracket are ensured to correspond to the three connecting ribs Ⅱ of the back focus adjustment bracket; Step 2: After the lens is adjusted, install it at the front end of the lens bracket, and fix the detector at the rear end of the back focus adjustment bracket; Step 3: The three adjustment screws are respectively threadedly connected to the connection rib I on the lens bracket. When adjusting the back intercept, the axial force acts on the connection rib II of the back intercept adjustment bracket by rotating the adjustment screws, and the flexible hinge micro-displacement amplification mechanism is deformed, that is, the back intercept changes. The imaging is observed synchronously until the imaging is clear, and the entire detection system is fixed on the collimated optical platform through the rear end of the back intercept adjustment bracket; then the image plane is tilted and corrected using the three adjustment screws; Step 4: After the image is clear and the image plane is not tilted, tighten the locking nut on the adjustment screw and apply glue at the root of the locking nut to prevent it from loosening.

Images