Method for controlling the machining and optical distortion of a fiber optic inverter profile

Abstract

The application discloses a kind of optical fiber inverter shape processing and optical distortion control method, comprising the following steps: pre-processing: optical fiber inverter blank plate is ground outside circle, obtain the first optical fiber inverter semi-finished product;With optical center: the first optical fiber inverter semi-finished product is locked into chuck, chuck is installed on optical centering adjustment platform, and optical centering is carried out;Process step size: chuck and optical centering adjustment platform are removed to processing center and are fixed, and the first optical fiber inverter semi-finished product is processed according to the size of the step up and down outside circle set step, and the second optical fiber inverter semi-finished product is obtained;Cylinder processing: loosen chuck, the second optical fiber inverter semi-finished product is taken out from chuck, after inverting, it is locked again in chuck, then the cylinder size processing outside step is carried out, and the optical fiber inverter finished product is obtained.The application can effectively reduce the optical distortion defect of optical fiber inverter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber image-converter manufacturing, in particular to a method for controlling the shape processing and optical distortion of an optical fiber image inverter. BACKGROUND

[0002] Micro-light imaging technology is a technology for taking, converting and enhancing the image of a scene under micro-light or other non-visible light illumination based on the external photoelectric effect, electron multiplication and photoelectric conversion principles of a device, and finally displaying the image as a visible image for the human eye. Micro-light night vision technology is also known as image enhancement technology. The structure and principle of an image intensifier are as follows: a weak optical image is input into the input window of an optical fiber image-converter, then converted into a weak electronic image by a photocathode, then the electronic image is enhanced by a micro-channel plate, and finally an output enhanced optical image visible to the human eye is formed on a fluorescent screen.

[0003] An optical fiber image inverter is an excellent photoelectric imaging component. Its most typical application is as an optical output window of a micro-light image intensifier, which plays an important role in improving the quality of the imaging device. The image transmission mechanism of the optical fiber image inverter is realized by using the total reflection principle of optical fibers. The optical fibers constituting the optical fiber image inverter are prepared by using a low refractive index skin glass tube, a high refractive index core glass rod and a high-efficiency stray light absorbing glass filament by rod tube combination and vacuum drawing process through hot melting, blank processing and torsion forming. The optical fiber image inverter is a hard optical fiber image-converter that can output an input image by 180°, which is prepared by tightly stacking and arranging thousands of micron-level optical fiber filaments, hot melting, and torsion forming. Due to the small size, light weight and optical zero thickness of the optical fiber image inverter, it is usually used in micro-light night vision image intensifiers to solve the image inversion problem of the front-end imaging system. In order to facilitate the assembly and use of other components during the preparation of the micro-light image intensifier, the shape of the optical fiber image inverter needs to be processed into a circular truncated cone shape, which is fixed by relying on the fusion of the step and the flange, and the optical fibers must be perpendicular to the end face, and the optical center of the optical fiber image inverter must coincide with the geometric center of the shape. The optical distortion is the most important performance control point in the shape processing of the optical fiber image inverter, and the image transmission from the input end to the output end of the processed optical fiber image inverter must not be offset. Therefore, the image displacement distortion of the optical fiber image inverter must be strictly controlled.

[0004] Image displacement distortion is the maximum overall displacement of a pattern observed from an output end face relative to a cross point at the center of an input end face of a fiber optic image transfer element. When a fiber optic inverter is profiled, its image transmission requires no optical deviation, otherwise the image transmission of the fiber optic inverter will be deviated, i.e. image displacement distortion is generated, which will cause target position deviation in image observation of a low-light-level image intensifier, thereby affecting the accuracy of image observation. The main cause of image displacement distortion is that the geometric mechanical axis and the optical axis do not coincide in the optical processing process. With the gradual development of low-light-level night vision technology, the performance index requirements of fiber optic inverter products are becoming higher and higher. Among them, the image displacement of the fiber optic inverter is increased from the original 250 μm to 100 μm and below. In particular, with the change of the size and height of the fiber optic inverter, it brings great difficulty to the processing process, therefore, it is very important to improve the control precision of the image displacement distortion of the fiber optic inverter.

[0005] At present, the profile processing and image displacement control method of the fiber optic inverter mostly adopts a mechanical positioning mode, which requires a large number of tooling, molds, fixtures and consumes a large amount of auxiliary raw materials such as adhesives. These mechanical positioning modes almost require manual operation by operators, which not only has high labor intensity, uneven operation level, poor process consistency, low processing precision, low labor productivity, unstable performance index of image displacement distortion after profile processing, and high proportion of damage caused by human factors in the profile processing process, which greatly affects the production quality and finished product qualification rate of the fiber optic inverter product. SUMMARY

[0006] The purpose of the embodiment of the present application is to overcome the defects of the prior art, and to provide a fiber optic inverter profile processing and optical distortion control method capable of effectively reducing the optical distortion defects of the fiber optic inverter.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0008] A fiber optic inverter profile processing and optical distortion control method, comprising the following steps:

[0009] (1) Pre-processing: grinding the outer circle of a fiber optic inverter blank plate twisted by 180° to form a cylindrical body with a first diameter, to obtain a first fiber optic inverter semi-finished product;

[0010] (2) Optical centering: locking the first fiber optic inverter semi-finished product in a chuck, exposing the part to be processed to form a step, installing the chuck with the first fiber optic inverter semi-finished product on an optical centering adjustment platform, and performing optical centering to make the image transmission of the first fiber optic inverter semi-finished product after rotation not deviated;

[0011] (3) Step size processing: after the optical center is fixed, the chuck with the first fiber image inverter semi-finished product is moved to the machining center for fixation, and the first fiber image inverter semi-finished product is processed according to the set step up and down outer circle size, the outer circle size of the step upper part is the second diameter, and the outer circle size of the step lower part is the third diameter, so as to obtain the second fiber image inverter semi-finished product.

[0012] (4) Cylindrical surface processing: the chuck is loosened, the second fiber image inverter semi-finished product is taken out from the chuck, and then is placed in the chuck upside down, so that the upper surface of the chuck is parallel to the outer circle surface of the step upper part, the chuck is locked, and then the cylindrical surface size processing is performed, the cylindrical surface is processed to the outer circle size of the third diameter, that is, the fiber image inverter shape processing finished product is obtained.

[0013] The first diameter is 22.8-23.0 mm.

[0014] The optical center fixing includes:

[0015] 1) Prepare a projector and a crosshair scale;

[0016] 2) Fix the crosshair scale on the working table of the projector, and adjust the focal length of the projector so that the image of the crosshair line on the crosshair scale is coincident with the crosshair line on the screen of the projector;

[0017] 3) Place the first fiber image inverter semi-finished product on one side of the crosshair scale, so that the geometric center line of the first fiber image inverter semi-finished product is coincident with the center of the crosshair line of the crosshair scale, and use the optical center fixing platform to fix the position of the first fiber image inverter semi-finished product;

[0018] 4) Adjust the focal length of the projector again, so that the crosshair line of the crosshair scale transmitted through the first fiber image inverter semi-finished product is clearly imaged on the screen of the projector;

[0019] 5) Rotate the first fiber image inverter semi-finished product by 180° in the optical center fixing platform, and observe whether the image of the horizontal line or the vertical line of the crosshair line of the crosshair scale is offset relative to the horizontal line or the vertical line on the screen of the projector, if there is an offset, adjust the position of the top wire on the front, rear, left and right four directions of the lower side of the chuck, so that the image transmission of the crosshair image transmitted through the first fiber image inverter semi-finished product after rotation does not occur.

[0020] The second diameter is 19.0-19.8 mm, and the third diameter is 21.8-22.0 mm.

[0021] The image displacement distortion of the fiber image inverter shape processing finished product can be controlled to be ≤50 μm.

[0022] The application also provides a collet device, which comprises a collet, wherein a containing cavity is arranged in the middle of the collet, and a collet locking device is arranged on the outside of the collet.

[0023] The application further provides an optical fiber inverter contour processing device, which comprises the collet device and an optical centering adjustment platform, and the collet device is arranged on the optical centering adjustment platform.

[0024] The collet is arranged on the optical centering adjustment platform through a bottom screw.

[0025] A jackscrew is arranged on the optical centering adjustment platform and located at the side of the lower part of the collet, and is used for adjusting the center position of the collet.

[0026] The jackscrew is four, and is arranged at the front, rear, left and right positions of the lower part of the collet.

[0027] Compared with the prior art, the optical fiber inverter contour processing and optical distortion control method has the following beneficial effects:

[0028] (1) The image displacement distortion of the processed optical fiber inverter is less than or equal to 50 microns.

[0029] (2) The production cost is saved, and a large amount of raw materials and auxiliary materials are saved.

[0030] (3) The damage ratio in the processing process is reduced, and the influence factors of human operation are reduced.

[0031] (4) The processing efficiency and product quality of the optical fiber inverter are improved, the automatic processing of the optical fiber inverter contour processing is realized, and the quality and product contour processing consistency and quality stability of the optical fiber inverter contour processing are greatly improved.

[0032] The optical fiber inverter contour processing and optical distortion control method has the advantages of simple operation, low production cost, good product quality consistency, few optical distortion defects and the like. Through the contour processing method and optical distortion control of the optical fiber inverter, the problem of difficult control of optical distortion of the optical fiber inverter is solved, the processed optical fiber inverter is applied to a micro-light image intensifier, and the imaging quality and other key performances of the optical fiber inverter are greatly improved. The product can meet the matching needs of the micro-light night vision industry, can replace the traditional optical fiber inverter product, improves the comprehensive use performance, promotes the development of optoelectronic devices in the fields of spatial vision measurement and detection imaging towards high-tech and low defects, and has good application and promotion prospect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The first optical fiber inverter semi-finished product after pre-processing is shown in the schematic view.

[0034] Figure 2 The first optical fiber inverter semi-finished product optical centering operation schematic diagram provided for the embodiment of the present application;

[0035] Figure 3 The optical inverter shape processed finished product schematic diagram provided for the embodiment of the present application.

[0036] Among them, 201 is an optical centering adjusting platform, 202 is a centering top screw hole, 203 is a collet, 204 is a collet locking device, 205 is a first optical fiber inverter semi-finished product, and 206 is a milling cutter.

[0037] 301 is a fiber inverter finished product step surface, 302 is a fiber inverter finished product step lower end surface, and 303 is a fiber inverter finished product cylindrical surface. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application clearer, the following will further describe the embodiments of the present application in combination with the drawings.

[0039] Referring to Figure 1 and Figure 2 A collet device, comprising a collet 203, a receiving cavity is arranged in the middle of the collet 203, the first optical fiber inverter semi-finished product 205 is clamped in the receiving cavity, the collet locking device 204 is arranged outside the collet 203, and the collet 203 can be clamped and released to the cylindrical fiber inverter semi-finished product by adjusting the collet locking device 204.

[0040] The outer diameter of the first optical fiber inverter semi-finished product 205 is 19.0-23.0 mm. When the outer diameter is greater than 23.0 mm, the collet cannot be clamped, and when the outer diameter is less than 19.0 mm, the optical center is easy to deviate after clamping.

[0041] Referring to Figure 2 and Figure 3 An optical fiber inverter shape processing device, comprising a collet 203 and an optical centering adjusting platform 201, and the collet 203 and the collet locking device 204 are arranged on the optical centering adjusting platform 201.

[0042] Preferably, after the collet 203 clamps the first optical fiber inverter semi-finished product 205, the collet 203 is fixedly installed on the optical centering adjusting platform 201 through the screw at the bottom of the collet 203.

[0043] Further, the optical centering adjusting platform 201 is provided with a centering top screw hole 202 for installing a top screw, and the top screw is located at the side of the lower part of the collet 203 and is used for adjusting the center position of the first optical fiber inverter semi-finished product 205 clamped on the collet 203.

[0044] Preferably, the four centering thimbles correspond to four centering thimble holes 202, and the four thimbles are respectively located at the front, rear, left and right of the lower part of the collet 203.

[0045] Embodiment 1

[0046] A method for controlling the shape processing and optical distortion of a fiber image inverter, comprising the following steps:

[0047] (1) Pre-processing: the fiber image inverter blank shaped by twisting 180° is processed by cylindrical grinding, and the size is ground to a cylinder with an outer diameter of 19.0-23.0 mm, to obtain a first fiber image inverter semi-finished product;

[0048] (2) Optical centering: the first fiber image inverter semi-finished product is loaded into the collet, exposing the part that needs to be processed to form a step and the part 3-5 mm below the step, and then locked. The cylindrical surface of the first fiber image inverter semi-finished product after locking is tightly attached to the inner wall of the collet. The collet loaded with the first fiber image inverter semi-finished product is installed on the optical centering adjustment platform for optical centering. When optical centering, a projector and a crosshair reticle are prepared; the crosshair reticle is fixed on the projector workbench, and the focal length of the projector is adjusted so that the image of the crosshair on the crosshair reticle coincides with the crosshair on the projector screen; then the first fiber image inverter semi-finished product is placed on one side of the crosshair reticle, so that the geometric center line of the first fiber image inverter semi-finished product coincides with the center of the crosshair on the crosshair reticle, and the position of the first fiber image inverter semi-finished product is fixed using the optical centering adjustment platform; the focal length of the projector is adjusted again so that the crosshair on the crosshair reticle transmitted through the first fiber image inverter semi-finished product is clearly imaged on the screen of the projector; the first fiber image inverter semi-finished product is rotated 180° in the optical centering adjustment platform, and the image of the horizontal line or vertical line of the crosshair on the crosshair reticle is observed relative to the horizontal line or vertical line on the projector screen. If there is a deviation, the positions of the thimbles in the front, rear, left and right directions of the side surface below the collet are adjusted so that the image transmission of the crosshair transmitted through the first fiber image inverter semi-finished product after rotation does not deviate. That is, the image of the horizontal line or vertical line of the crosshair overlaps the horizontal line or vertical line on the projector screen. The amount of deviation here represents the size of the image displacement distortion of the fiber image inverter, and also reflects the deviation amount of the geometric axis of the fiber image inverter from the optical center axis.

[0049] (3) processing step size: after completing the optical center, the chuck with the first fiber image inverter semi-finished product and the optical center adjustment platform are moved to the machining center for fixation, and the first fiber image inverter semi-finished product is processed by milling tool according to the set step up and down outer circle size, the outer circle size of the step upper part is 19.0-19.8mm; the height of the step can be set according to the need, the outer circle size of the step lower part is 21.8-22.0mm, and the second fiber image inverter semi-finished product is obtained;

[0050] (4) cylindrical surface processing: loosen the chuck, take out the second fiber image inverter semi-finished product from the chuck, invert it and then put it in the chuck, make the upper surface of the chuck parallel to the outer circle surface of the step upper part, lock the chuck, and then process the cylindrical surface size outside the step to the outer circle size of 21.8-22.0mm, which is consistent with the outer circle size of the step lower part, that is, the fiber image inverter shape processing finished product is obtained.

[0051] Referring to Figure 3 , the processing size of the present application can be selected according to the need, preferably ground to the outer circle size of 23.0mm, the outer circle size of the step upper part is 19.8mm, that is, the diameter of the fiber image inverter finished product step surface 301 is 19.8mm, the outer circle size of the step lower part is 21.85mm, that is, the diameter of the fiber image inverter finished product step lower end surface is 21.85mm, the cylindrical surface is processed to the outer circle size of 21.85mm, that is, the outer circle diameter of the fiber image inverter finished product cylindrical surface is 21.85mm.

[0052] Using the control method of the present application can effectively reduce the optical distortion of the fiber image inverter, especially the generation of image displacement distortion defects, and also help to improve the shape processing size accuracy and processing efficiency of the fiber image inverter, save a lot of tooling fixtures and raw material consumption, reduce the damage in the production process, and improve the product qualification rate.

[0053] The above only describes the preferred embodiments of the present application and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of controlling the profile and optical distortion of a fiber optic inverter, comprising: It comprises the following steps: (1) Pre-processing: the twist 180° shaped fiber optic inverter blank plate is processed by grinding the outer circle, and the size is ground to a cylinder with a first diameter, obtaining the first fiber optic inverter semi-finished product; (2) Optical centering: the first fiber optic inverter semi-finished product is locked in the chuck, and the part that needs to be processed is exposed, the chuck with the first fiber optic inverter semi-finished product is installed on the optical centering adjusting platform, and the optical centering is performed, so that the image transmission after the rotation of the first fiber optic inverter semi-finished product does not deviate; (3) Step size processing: after the optical centering is completed, the chuck with the first fiber optic inverter semi-finished product and the optical centering adjusting platform are moved to the processing center for fixation, and the first fiber optic inverter semi-finished product is processed by milling tool according to the set step size of the upper and lower outer circles, the outer circle size of the upper step is the second diameter; the outer circle size of the lower step is the third diameter, obtaining the second fiber optic inverter semi-finished product; (4) Cylindrical surface processing: the chuck is loosened, the second fiber optic inverter semi-finished product is taken out from the chuck, and then is placed in the chuck upside down, so that the upper surface of the chuck is parallel to the outer surface of the upper step, the chuck is locked, and then the cylindrical surface size outside the step is processed, the cylindrical surface is processed to the outer circle size of the third diameter, that is, the finished product of the fiber optic inverter profile processing is obtained.

2. The control method according to claim 1, characterized by, The first diameter is 22.8-23.0mm.

3. The control method according to claim 2, characterized by, The optical centering comprises: 1) Prepare the projector and the crosshair scale plate; 2) Fix the crosshair scale plate on the projector workbench, adjust the focal length of the projector, so that the image of the crosshair line on the crosshair scale plate coincides with the crosshair line on the projector screen; 3) Place the first fiber optic inverter semi-finished product on one side of the crosshair scale plate, so that the geometric center line of the first fiber optic inverter semi-finished product coincides with the center of the crosshair line of the crosshair scale plate, and use the optical centering adjusting platform to fix the position of the first fiber optic inverter semi-finished product; 4) Adjust the focal length of the projector again, so that the crosshair line of the crosshair scale plate transmitted through the first fiber optic inverter semi-finished product is clearly imaged on the screen of the projector; 5) Rotate the first fiber optic inverter semi-finished product by 180° in the optical centering adjusting platform, observe whether the image of the horizontal line or vertical line of the crosshair line of the crosshair scale plate deviates relative to the horizontal line or vertical line on the projector screen, if there is deviation, adjust the position of the top wire in the front, rear, left and right four directions of the chuck, so that the image transmission after the rotation of the crosshair scale image transmitted through the first fiber optic inverter semi-finished product does not deviate.

4. The control method according to any one of claims 1 to 3, characterized by, The second diameter is 19.0-19.8mm, and the third diameter is 21.8-22.0mm.

5. The method according to claim 4, wherein the image displacement distortion of the finished product of the fiber optic inverter profile processing can be controlled to ≤50μm.

Images