A reticle fixing device for having no influence on the focal plane position of a collimator

Abstract

The present invention provides a graticule fixing device which has no influence on the focal plane position of a collimator, and solves the problem that the existing graticule fixing method cannot meet the measurement accuracy requirements of space satellite-borne equipment. The device comprises a first annular sleeve, an annular trimming gasket, a micro annular magnet, a countersunk screw, a mounting seat, and a graticule pressing ring; the first annular sleeve is stepped, and its large end face is provided with a plurality of threaded holes along the circumferential direction; the annular trimming gasket is provided with a plurality of through holes in the circumferential direction; the countersunk screw passes through the micro annular magnet and the through holes in sequence and is connected with the threaded hole; the mounting seat is stepped, and its small end outer diameter is adapted to the inner diameter of the first annular sleeve; a threaded hole is provided on the mounting seat, and the graticule pressing ring is installed in the threaded hole, and the graticule is fixed between the mounting seat and the graticule pressing ring, and the mounting seat is made of ferromagnetic material, and when the small end of the mounting seat is arranged in the first annular sleeve, the large end of the mounting seat is attracted to the micro annular magnet.

Description

Technical Field

[0001] The invention belongs to the technical field of optical testing, and in particular relates to a graticule fixing device which has no influence on the focal plane position of a collimator. Background Art

[0002] A collimator is an optical instrument used in optical laboratories to produce infinitely parallel light beams. Its focal position is strictly calibrated and is equipped with different reticles. It can be widely used in the measurement of optical parameters such as geometric parameters and imaging quality of optical instruments. It is an important tool in optical assembly and detection.

[0003] The focal plane position of the collimator generally has a position adjustment structure. During the calibration process, its focal plane position is determined through rigorous measurement, and then fixed after being adjusted into place through the position adjustment structure. Different parameters can be measured by replacing different graticules during use.

[0004] With the development of aerospace and aviation technology, large-aperture and long-focal-length cameras are increasingly used in space-borne equipment, and the test accuracy requirements for various optical parameters of the cameras are extremely high. For example, the measurement accuracy of focal length has been improved to ±1‰. This requires that the positioning accuracy and repeatability of the collimator when replacing the graticule during use should be high, and the structure should be kept as free of large forces as possible to prevent changes in the focal plane position and affect the accuracy of the measurement.

[0005] The prior art is to install the graticule using a graticule frame, and the graticule and the graticule frame use a shaft-hole type plug-in fit. In order to improve the positioning accuracy and repeatability when the graticule is replaced, the corresponding requirements are generally achieved by reducing the gap between the graticule mounting hole and the graticule frame. However, during use, different graticules need to be replaced to test different parameters. Since the gap between the graticule mounting hole and the graticule frame is extremely small, a slight mistake in the plug-in process will cause jamming. The graticule frame needs to be shaken vigorously or hit with a metal block before it can be inserted or pulled out. If this is repeated several times, the calibrated focal plane position cannot be guaranteed. In order to facilitate plug-in and pull-out, the shaft-hole plug-in fit gap cannot be too small, but this will cause the positioning accuracy and repeatability to be reduced when the graticule is replaced.

[0006] Comprehensive analysis shows that the existing graticule installation method cannot meet the measurement accuracy requirements of space-borne equipment. Therefore, it is urgent to design a new graticule fixing structure suitable for application in space-borne equipment. Summary of the invention

[0007] In order to solve the technical problem that the existing graticule fixing method cannot meet the measurement accuracy requirements of space-borne equipment, the present invention provides a graticule fixing device for having no influence on the focal plane position of the collimator, which can realize convenient and quick replacement of the graticule during the measurement process, accurate positioning, and will not cause the focal plane structure to be subjected to a large force, thereby preventing the focal plane position from changing due to replacement of the graticule.

[0008] To achieve the above purpose, the technical solution provided by the present invention is:

[0009] A reticle fixing device for having no influence on the focal plane position of a collimator, the special features of which are: comprising a reticle base and a reticle mounting assembly; the reticle base comprising a first annular sleeve, an annular trimming gasket, a micro annular magnet and a countersunk screw; the first annular sleeve is stepped, and a plurality of threaded holes are arranged on its large end face along the circumferential direction; the inner diameter of the annular trimming gasket is greater than or equal to the inner diameter of the first annular sleeve, and a plurality of through holes matching the threaded holes are arranged on the circumferential direction of the annular trimming gasket; the number of the micro annular magnets and the countersunk screws is the same as that of the screw The number of the grooves is adapted; the countersunk screw passes through the micro-annular magnet and the through hole in sequence and is connected to the threaded hole; the reticle mounting assembly includes a mounting seat and a reticle pressing ring; the mounting seat is stepped, and the outer diameter of the small end thereof is adapted to the inner diameter of the first annular sleeve; the mounting seat is provided with three layers of stepped through holes that pass through the large end and the small end, which are the first through hole, the second through hole and the third through hole, respectively, with the diameters decreasing in sequence; the first through hole is provided with a thread, and the reticle pressing ring is installed in the first through hole; the diameter of the second through hole is equal to the diameter of the reticle to be installed;

[0010] The mounting seat is made of ferromagnetic material;

[0011] When the small end of the mounting seat is arranged in the first annular sleeve, the large end of the mounting seat is attracted to the miniature annular magnet.

[0012] Furthermore, an outer surface of the small end of the mounting seat is provided with an outer conical surface; and an inner surface of the small end of the first annular sleeve is provided with an inner conical surface matching the outer conical surface.

[0013] Furthermore, the small end of the first annular sleeve is divided into three annular cylinders with different inner diameters from the end close to the large end of the first annular sleeve to the end far away from the large end of the first annular sleeve, namely the first annular cylinder, the second annular cylinder, and the third annular cylinder; the inner diameter of the first annular cylinder is equal to the inner diameter of the large end of the first annular sleeve; the inner diameter of the second annular cylinder gradually decreases from the end close to the first annular cylinder to the end close to the third annular cylinder to form the inner conical surface; the inner diameter of the third annular cylinder is equal to the minimum inner diameter of the second annular cylinder, and the small end portion of the mounting seat is provided with the outer conical surface matching the inner conical surface.

[0014] Furthermore, a notch is provided on the outer end surface of the graticule pressure ring along the circumferential direction.

[0015] Furthermore, the large end of the first annular sleeve is provided with evenly distributed countersunk holes along the circumferential direction, and the countersunk holes are located outside the threaded holes.

[0016] Furthermore, the number of the threaded holes is 3 and they are evenly distributed along the circumferential direction.

[0017] Furthermore, the tapers of the outer cone surface and the inner cone surface are both 1:50 or 1:20 or 1:10.

[0018] Furthermore, the second through hole is located at the small end of the mounting seat, and its depth is less than the thickness of the graticule.

[0019] Furthermore, the mounting seat is made of steel.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The graticule fixing device of the present invention installs the graticule between the graticule pressure ring and the mounting seat. After the countersunk screw passes through the through hole and threaded hole of the micro-annular magnet and the annular trimming gasket, the micro-annular magnet, the annular trimming gasket and the first annular sleeve are connected. The mounting seat is made of steel material, and the small end of the mounting seat is arranged in the first annular sleeve. The large end of the mounting seat is attracted to the micro-annular magnet. The mounting seat and the first annular sleeve are fixed by the magnetic force of the micro-annular magnet, and precise positioning is achieved by grinding the trimming gasket. When the graticule needs to be replaced, it is only necessary to overcome the magnetic force of the micro-annular magnet, take out the mounting seat, and then put in the mounting seat with the required graticule installed, so as to achieve rapid disassembly and assembly, and the focal plane structure is subjected to extremely small force, which has no effect on the focal plane position of the collimator, and can meet the measurement accuracy requirements of space-borne equipment.

[0022] 2. The mounting seat and the first annular sleeve in the graticule fixing device of the present invention can be provided with mutually matching conical surfaces, and the two conical surfaces can be in contact to achieve precise positioning. The trimming gasket can be polished to ensure that when the two conical surfaces are in contact, the large end of the mounting seat is just attracted by the magnet.

[0023] 3. In the graticule plate fixing device of the present invention, the mounting seat and the graticule plate pressure ring are threadedly connected. In order to facilitate the rotation of the graticule plate pressure ring in the mounting seat, a notch is provided on the outer end surface of the graticule plate pressure ring along the circumferential direction for connection with an external rotating part, thereby driving the rotation of the graticule plate pressure ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure diagram of the reticle fixing device of the present invention which has no influence on the focal plane position of the collimator Figure 1 (The reticle base and reticle mounting assembly are not attracted together by the micro ring magnet);

[0025] Figure 2 The structure diagram of the reticle fixing device of the present invention which has no influence on the focal plane position of the collimator Figure 2 (The reticle base and reticle mounting assembly are attracted together by a micro ring magnet);

[0026] Figure 3 yes Figure 2 A cross-sectional view of

[0027] Figure 4 It is an exploded view of the reticle fixing device of the present invention which has no influence on the focal plane position of the collimator;

[0028] Figure 5 It is a schematic structural diagram of a reticle base in a reticle fixing device for having no influence on the focal plane position of a collimator according to the present invention;

[0029] Figure 6 yes Figure 5 A schematic diagram of a direction;

[0030] Figure 7 yes Figure 6 AA section view;

[0031] Figure 8 It is a structural schematic diagram of a reticle mounting assembly in a reticle fixing device that has no influence on the focal plane position of a collimator according to the present invention;

[0032] Fig. 9 yes Figure 8 A schematic diagram of a direction;

[0033] Fig.10 yes Fig. 9 BB section view.

[0034] The reference numerals are as follows:

[0035] 1-scale plate base, 11-first annular sleeve, 111-threaded hole, 112-inner cone, 113-first annular cylinder, 114-second annular cylinder, 115-third annular cylinder, 116-countersunk hole, 12-annular trimming gasket, 121-through hole, 13-micro annular magnet, 14-countersunk screw, 2-scale plate mounting assembly, 21-mounting seat, 211-first through hole, 212-second through hole, 213-third through hole, 214-outer cone, 22-scale plate pressure ring, 221-notch, 3-scale plate. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] The present invention provides a graticule fixing device which can be quickly disassembled and assembled, accurately positioned, and has no influence on the focal plane position of a collimator. The graticule can be replaced conveniently and quickly during a test, and the positioning is accurate, and a large force will not be applied to the focal plane structure, thereby preventing the focal plane position from changing due to the replacement of the graticule.

[0038] like Figures 1 to 4 As shown, a reticle fixing device for having no influence on the focal plane position of a collimator comprises a reticle base 1 and a reticle mounting assembly 2. The reticle base 1 comprises a first annular sleeve 11, an annular trimming gasket 12, a micro annular magnet 13 and a countersunk screw 14. The first annular sleeve 11 is stepped, and a plurality of threaded holes 111 are arranged on its large end surface along the circumferential direction. Figure 5 and Figure 6 As shown, in this embodiment, there are three evenly distributed threaded holes 111, the inner diameter of the annular trimming gasket 12 is greater than or equal to the inner diameter of the first annular sleeve 11, and its outer diameter is less than or equal to the outer diameter of the large end of the first annular sleeve 11, and the annular trimming gasket 12 is provided with a plurality of through holes 121 matching the threaded holes 111 in the circumferential direction, and the number of the miniature annular magnets 13 and the countersunk screws 14 are both adapted to the number of the threaded holes 111, and the countersunk screws 14 pass through the miniature annular magnets 13 and the through holes 121 of the annular trimming gasket 12 in sequence and are connected to the threaded holes 111, so as to fix the miniature annular magnets 13, the annular trimming gasket 12 and the first annular sleeve 11;

[0039] like Figures 8 to 10 As shown, the reticle mounting assembly 2 includes a mounting seat 21 and a reticle pressing ring 22; the mounting seat 21 is stepped, and the outer diameter of the small end thereof is matched with the inner diameter of the first annular sleeve 11; the mounting seat 21 is provided with three-layer stepped through holes penetrating the large end and the small end, which are a first through hole 211, a second through hole 212 and a third through hole 213, the diameters of which decrease successively; the first through hole 211 is provided with a thread, the second through hole 212 is used to place the reticle 3, and its diameter is equal to that of the reticle 3, and the second through hole 212 is arranged near the small end of the mounting seat 21, and its depth is less than that of the reticle 3. Thickness; the graticule pressing ring 22 is connected to the mounting base 21 by a thread, and the graticule can be installed between the two to form a graticule mounting assembly 2; the mounting base 21 is made of ferromagnetic material. In this embodiment, the mounting base 21 can be selected to be made of steel material, and the first annular sleeve 11 is made of metal material; when the small end of the mounting base 21 is arranged in the first annular sleeve 11, the large end of the mounting base 21 is attracted to the micro-annular magnet 13 and fixed by the magnetic force of the micro-annular magnet 13. When replacing, it is only necessary to overcome the magnetic force of the micro-annular magnet 13, and there is no effect on the focal plane position of the parallel light tube.

[0040] For precise positioning, both the reticle base 1 and the reticle mounting assembly 2 have conical surfaces, and the outer surface of the small end of the mounting seat 21 is provided with an outer conical surface 214; the inner surface of the small end of the first annular sleeve 11 is provided with an inner conical surface 112 matching the outer conical surface 214, and the taper of the two conical surfaces is kept consistent. Through design and later grinding of the trimmed gasket, it is ensured that when the two conical surfaces are in contact, the large end of the mounting seat 21 is just adsorbed by the magnet. The fixing device of the present invention does not rely on the plug-in fit of the shaft hole to achieve positioning and fixing, but relies on the fit of the two conical surfaces to achieve precise positioning, and the compaction of the conical surface and the fixation of the structure are achieved by magnets.

[0041] like Figure 7 As shown, the small end of the first annular sleeve 11 is divided into three annular cylinders with different inner diameters from the end close to the large end of the first annular sleeve 11 to the end far away from the large end of the first annular sleeve 11, namely the first annular cylinder 113, the second annular cylinder 114, and the third annular cylinder 115; the inner diameter of the first annular cylinder 113 is equal to the inner diameter of the large end of the first annular sleeve 11; the inner diameter of the second annular cylinder 114 gradually decreases from one end close to the first annular cylinder 113 to one end close to the third annular cylinder 115, forming an inner conical surface 112; the inner diameter of the third annular cylinder 115 is equal to the minimum inner diameter of the second annular cylinder 114, and the small end of the mounting seat 21 is provided with an outer conical surface 214 matching the inner conical surface 112, and the tapers of the two conical surfaces are consistent, and the tapers of the outer conical surface 214 and the inner conical surface 112 are both 1:50 or 1:20 or 1:10.

[0042] In order to facilitate the threaded connection between the reticle plate pressure ring 22 and the mounting seat 21, two notches 221 are evenly opened along the circumferential direction on the outer end surface of the reticle plate pressure ring 22, and an external rotating part is arranged in the two notches 221. The rotation of the external rotating part drives the reticle plate pressure ring 22 to be screwed in and out relative to the mounting seat 21.

[0043] Three evenly distributed countersunk holes 116 are provided on the outermost periphery of the large end of the first annular sleeve 11 along the circumferential direction, so that the fixing device of this embodiment can be installed on the adjustment structure of the focal plane position.

[0044] During use of the fixing device of this embodiment, it is only necessary to place the steel graticule mounting assembly 2 (small end of the mounting seat 21) into the graticule base 1 (first annular sleeve 11), and the magnetic force of the micro annular magnet 13 will press the two conical surfaces tightly, thereby achieving precise positioning. When replacing, it is only necessary to overcome the magnetic force of the micro annular magnet 13, and the steel graticule mounting assembly 2 can be easily taken out, and then other steel graticule mounting assemblies 2 can be placed in, thereby achieving quick disassembly and assembly, and the force acting on the focal plane structure is extremely small, and there is no influence on the focal plane position of the parallel light tube.

[0045] The above is only a description of the preferred implementation mode of the present invention, and the technical solution of the present invention is not limited thereto. Any known deformation made by those skilled in the art on the basis of the main technical concept of the present invention belongs to the technical scope to be protected by the present invention.

Claims

1. A reticle fixing device for having no influence on the focal plane position of a collimator, characterized in that: It comprises a reticle base (1) and a reticle mounting assembly (2); The reticle base (1) comprises a first annular sleeve (11), an annular trimming gasket (12), a micro annular magnet (13) and a countersunk screw (14); The first annular sleeve (11) is stepped, and a plurality of threaded holes (111) are arranged on its large end surface along the circumferential direction; The inner diameter of the annular trimming gasket (12) is greater than or equal to the inner diameter of the first annular sleeve (11), and the annular trimming gasket (12) is provided with a plurality of through holes (121) matching with the threaded holes (111) in the circumferential direction; The number of the micro-annular magnets (13) and the countersunk screws (14) are both adapted to the number of the threaded holes (111); The countersunk screw (14) passes through the micro annular magnet (13) and the through hole (121) in sequence and is connected to the threaded hole (111); The reticle mounting assembly (2) comprises a mounting seat (21) and a reticle pressing ring (22); The mounting seat (21) is in a step shape, and the outer diameter of the small end thereof is adapted to the inner diameter of the first annular sleeve (11); The mounting seat (21) is provided with three-layer stepped through holes penetrating the large end and the small end, which are respectively a first through hole (211), a second through hole (212) and a third through hole (213) with diameters decreasing in sequence; The first through hole (211) is provided with a thread, and the reticle pressure ring (22) is installed in the first through hole (211); The diameter of the second through hole (212) is equal to the diameter of the reticle (3) to be installed; the second through hole (212) is located at the small end of the mounting seat (21), and its depth is less than the thickness of the reticle (3); The mounting seat (21) is made of ferromagnetic material; When the small end of the mounting seat (21) is arranged in the first annular sleeve (11), the large end of the mounting seat (21) is attracted to the micro annular magnet (13); An outer surface of the small end of the mounting seat (21) is provided with an outer conical surface (214); The inner surface of the small end of the first annular sleeve (11) is provided with an inner conical surface (112) matching the outer conical surface (214).

2. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 1, characterized in that: The small end of the first annular sleeve (11) is divided into three annular cylinders with different inner diameters from the small end close to the large end of the first annular sleeve (11) to the small end far away from the large end of the first annular sleeve (11), namely a first annular cylinder (113), a second annular cylinder (114), and a third annular cylinder (115); The inner diameter of the first annular cylinder (113) is equal to the inner diameter of the large end of the first annular sleeve (11); The inner diameter of the second annular cylinder (114) gradually decreases from an end close to the first annular cylinder (113) to an end close to the third annular cylinder (115), forming the inner conical surface (112); The inner diameter of the third annular cylinder (115) is equal to the minimum inner diameter of the second annular cylinder (114); The small end portion of the mounting seat (21) is provided with the outer conical surface (214) matching the inner conical surface (112).

3. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 1 or 2, characterized in that: The outer end surface of the graticule pressing ring (22) is provided with a notch (221) along the circumferential direction.

4. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 3, characterized in that: The large end of the first annular sleeve (11) is provided with countersunk holes (116) evenly distributed along the circumferential direction, and the countersunk holes (116) are located outside the threaded hole (111).

5. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 4, characterized in that: The number of the threaded holes (111) is 3 and they are evenly distributed along the circumferential direction.

6. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 1 or 2, characterized in that: The tapers of the outer conical surface (214) and the inner conical surface (112) are both 1:50, 1:20, or 1:

10.

7. A reticle fixing device for having no influence on the focal plane position of a collimator according to claim 1, characterized in that: The mounting seat (21) is made of steel.

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