CN112882186B - Welding fixing structure and fixing method suitable for adjustable reflector group - Google Patents
Welding fixing structure and fixing method suitable for adjustable reflector group Download PDFInfo
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- CN112882186B CN112882186B CN202110093567.8A CN202110093567A CN112882186B CN 112882186 B CN112882186 B CN 112882186B CN 202110093567 A CN202110093567 A CN 202110093567A CN 112882186 B CN112882186 B CN 112882186B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
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Abstract
The invention discloses a welding and fixing structure suitable for an adjustable reflector group, which comprises the reflector group and a reflector bracket (4), wherein the reflector group is coaxially arranged in the reflector bracket (4), a gap is reserved between the reflector group and the reflector bracket (4), soldering paste is filled in the gap, and the reflector group and the reflector bracket (4) are welded and fixedly connected through the soldering paste. The adopted welding and fixing mode allows no initial connection between the reflector group and the reflector bracket, so that the reflector group can be freely adjusted in five dimensions in space by using an adjusting tool, and the whole efficiency of reflector group adjustment is improved; the invention creatively improves the common welding process in the electronic assembly industry, is applied to the fixed connection of the optical-mechanical assembly, realizes the low-stress fixed connection and ensures that the assembly has better rigidity.
Description
Technical Field
The invention belongs to the technical field of precise assembly and adjustment of an optical system with high imaging quality, and relates to a welding fixing structure and a fixing method suitable for an adjustable reflector group.
Background
The Cassegrain optical system consists of an aspheric primary reflector and a secondary reflector, and the position precision of the secondary reflector relative to the primary reflector directly determines the imaging quality and the optical performance of the system. The common optical-mechanical structure type of the card system is as follows: the secondary mirror assembly (the secondary mirror and the secondary mirror frame) is in contact with and positioned on the end face of the secondary mirror frame, the secondary mirror is horizontally moved through a screw hole or adjusted by adding a copper sheet pad on the end face to incline the secondary mirror assembly, and the secondary mirror assembly is fastened by using a screw after the adjustment is finished, as shown in figure 1, the structure type is adopted in a card system mentioned in the technical research on the mounting and adjusting technology of the Cassegrain infrared optical system of photoelectric engineering, the mounting and adjusting method of the primary and secondary reflectors of the Cassegrain optical system of the patent and the like. However, the applicant finds that the above structural style and the debugging method based on the same have two problems in the actual debugging operation: firstly, the efficiency of the assembly and adjustment process is low, the adjustment amount of the secondary mirror is limited by the manual translation adjustment amount (the minimum adjustment amount is more than 0.05 mm) and the thickness of the copper foil with a pad (the thinnest specification is 0.03mm, and the corresponding minimum adjustment amount of the inclination is more than 1'), and efficient and high-precision assembly and adjustment cannot be realized; secondly, after the adjustment is finished, the screw fixation often brings obvious stress, so that the secondary mirror surface shape and the adjusted pose change again, image quality changes are caused, and the residual stress causes hidden danger to the reliability of the system.
A method for connecting secondary mirror assemblies and a secondary mirror frame in a silicon rubber filling mode is adopted in a text of 'catadioptric long-wave linear array infrared sensor assembling and adjusting technology' published in photoelectric engineering, a tool is used for determining the positions of the secondary mirror assemblies during assembling and adjusting, and after the adjustment is finished, the rubber filling mode is carried out on gaps between the secondary mirror assemblies and the secondary mirror frame. The method improves the precision and the efficiency of installation and adjustment, but because the clearance between the secondary mirror assembly and the secondary mirror frame is usually far larger than the clearance between the secondary mirror and the secondary mirror frame, the rigidity of the secondary mirror assembly bonded by the silicon rubber is poor, the product undergoes standing, testing and transportation, the rubber layer is aged, the secondary mirror assembly is displaced, the image quality is obviously reduced, and the requirement of engineering application of a card type system cannot be met.
Disclosure of Invention
Objects of the invention
The invention aims to solve the problem that an adjustable reflector group in a reflective optical system is reliably, efficiently and fixedly connected with a reflector bracket under low stress after the position posture adjustment is finished, and provides a method which is high in efficiency, reasonable and feasible for realizing the reliable and low-stress connection and fixation of the adjustable reflector group.
(II) technical scheme
In order to solve the technical problem, the invention provides a welding and fixing structure suitable for an adjustable reflector group, which comprises the reflector group and a reflector bracket 4, wherein the reflector group is coaxially arranged in the reflector bracket 4, a gap is reserved between the reflector group and the reflector bracket 4, solder paste is filled in the gap, and the reflector group and the reflector bracket 4 are fixedly connected in a welding way through the solder paste.
The reflector group comprises a reflector frame 5 and a reflector, the reflector frame 5 is cylindrical, a lens mounting groove is formed in one end face of the reflector frame, and the reflector is mounted in the lens mounting groove.
Wherein, a plurality of grooves 5-1 are arranged on the circumferential outer surface 5-2 of the reflector frame 5, and the grooves 5-1 are filled with soldering paste.
The reflector frame 4 comprises a thin-wall round hole 4-1, the reflector frame 5 is coaxially arranged in the thin-wall round hole 4-1, and the outer circumferential surface 5-2 of the reflector frame 5 is welded with the inner wall surface 4-3 of the thin-wall round hole 4-1.
Wherein, the circumference of the thin-wall round hole 4-1 is radially provided with a through hole 4-2 matched with the position of the groove 5-1, and the soldering paste in the groove 5-1 is heated through the through hole 4-2.
Wherein, the circumferential outer surface 5-2 of the reflector frame 5 and the part to be welded on the inner wall surface 4-3 of the thin-wall round hole 4-1 are plated with copper.
Wherein, the thickness of the plating layer is 0.1mm.
Wherein, the clearance between the reflector frame 5 and the reflector frame 4 is 0.6mm.
The invention also provides a welding and fixing method suitable for the adjustable reflector group, which comprises the following steps:
step 1: solder paste is filled between the reflector group and the reflector frame 4;
step 2: adjusting the spatial pose of the reflector group until the system requirement is met, and fixing the position of the reflector group by using an adjusting tool 3;
and step 3: heating the soldering paste on the upper part of the reflector bracket by a hot air gun for 3-5s;
and 4, step 4: and (4) removing the hot air gun, placing the hot air gun at room temperature for about 10s, and removing the connection between the reflector group and the adjusting tool 3.
And 5: rotating the reflector bracket 4 by 180 degrees, and heating and curing the soldering paste on the lower half part of the reflector bracket in the same way as the steps 3 and 4, so as to complete the welding and fixing operation of the reflector group.
In the step 1, a groove 5-1 on the outer surface of a cylinder of a reflector frame 5 is filled with soldering paste, and a reflector group is erected in a thin-wall circular hole of a reflector frame through an adjusting tool; in step 3, heating the solder paste from each through hole of the upper half part of the thin wall of the reflector bracket by using a hot air gun for 3-5s; and 5, rotating the reflector frame by 180 degrees, and heating and curing the solder paste from each through hole at the lower half part of the thin wall of the reflector frame.
(III) advantageous effects
The welding fixing structure and the fixing method suitable for the adjustable reflector group provided by the technical scheme have the beneficial effects that:
1) The invention adopts a welding fixing mode to allow no initial connection between the reflector group and the reflector bracket, so that the reflector group can be freely adjusted in five dimensions in space by using an adjusting tool, and the whole efficiency of reflector group adjustment is further improved.
2) The invention creatively improves the common welding process in the electronic assembly industry, is applied to the fixed connection of the optical-mechanical assembly, realizes the low-stress solid connection and ensures that the assembly has better rigidity.
3) The optical-mechanical assembly fixedly connected by welding has good reliability and can adapt to long-term use of products.
4) The welding flux and the heating device adopted in the invention are conventional products, and the method provided by the invention has strong operability and is easy to realize.
Drawings
FIG. 1 is a diagram of a Cassegrain optical-mechanical system including an adjustable mirror group.
Fig. 2 is a schematic view of a welding fixture structure.
Fig. 3 is a structural view of the mirror holder shown in fig. 2.
Fig. 4 is a structural view of the mirror frame shown in fig. 2.
In the figure: 1. a primary mirror assembly; 2. an adjustable secondary mirror group; 3. adjusting a tool; 4. a mirror frame; 5. a mirror frame.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
Aiming at the problems existing in the fixed connection structure and the installation and adjustment method of the adjustable reflector set of the common reflective optical system, in order to realize the reliable and low-stress connection and fixation of the adjustable reflector set, the embodiment provides the welding and fixing structure and the fixing method suitable for the adjustable reflector set.
As shown in fig. 1, a cassegrain optical-mechanical system with adjustable mirror groups includes a primary mirror assembly 1 and an adjustable secondary mirror group 2. Fig. 2 is a schematic view of a welding and fixing structure of the secondary adjustable mirror group, which includes a mirror group and a mirror bracket 4, the mirror group is coaxially installed in the mirror bracket 4, a gap is reserved between the mirror group and the mirror bracket 4, solder paste is filled in the gap, and the mirror group and the mirror bracket 4 are welded and fixed through the solder paste.
The reflector group comprises a reflector frame 5 and a reflector, the reflector frame 5 is cylindrical, a lens mounting groove is formed in one end surface of the reflector frame, and the reflector is mounted in the lens mounting groove; the outer surface 5-2 of the circumference of the reflector frame 5 is provided with a plurality of grooves 5-1, and the grooves 5-1 are filled with soldering paste.
The reflector frame 4 comprises a thin-wall round hole 4-1, the reflector frame 5 is coaxially arranged in the thin-wall round hole 4-1, and the outer circumferential surface 5-2 of the reflector frame 5 is welded with the inner wall surface 4-3 of the thin-wall round hole 4-1.
The circumference of the thin-wall round hole 4-1 is radially provided with a through hole 4-2 matched with the position of the groove 5-1, and the soldering paste in the groove 5-1 is heated through the through hole 4-2.
The circumferential outer surface 5-2 of the reflector frame 5 and the part to be welded on the inner wall surface 4-3 of the thin-wall round hole 4-1 are subjected to copper plating treatment, and the thickness of a plating layer is 0.1mm. The gap between the reflector frame 5 and the reflector frame 4 is 0.6mm.
Based on the above welding fixing structure, the welding fixing method of the embodiment includes the following steps:
step 1: filling low-temperature soldering tin paste in a groove on the outer surface of a reflector frame cylinder, and erecting a reflector group in a thin-wall round hole of a reflector frame through an adjusting tool;
step 2: adjusting the spatial pose of the reflector group until the system requirement is met, and fixing the position of the reflector group by using an adjusting tool 3;
and step 3: heating the solder paste from each through hole at the upper half part of the thin wall of the reflector bracket by using a special hot air gun for 3-5s;
and 4, step 4: and (4) removing the hot air gun, placing the hot air gun at room temperature for about 10s, and removing the connection between the reflector group and the adjusting tool 3.
And 5: and (5) rotating the reflector bracket by 180 degrees, and heating and curing the solder paste from each through hole on the lower half part of the thin wall of the reflector bracket in the same way as the steps 3 and 4 to complete the welding and fixing operation of the reflector group.
According to the technical scheme, aiming at the problem of fixedly connecting the secondary adjustable reflector group in the clamping system, the invention provides a welding and fixing type and a method suitable for the secondary adjustable reflector group. The method has the characteristics of short fixing time, high structural rigidity, low stress and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A welding and fixing structure suitable for an adjustable reflector group is characterized by comprising the reflector group and a reflector bracket (4), wherein the reflector group is coaxially arranged in the reflector bracket (4), a gap is reserved between the reflector group and the reflector bracket (4), soldering paste is filled in the gap, and the reflector group and the reflector bracket (4) are welded and fixedly connected through the soldering paste;
the reflector group comprises a reflector frame (5) and a reflector, the reflector frame (5) is cylindrical, a lens mounting groove is formed in one end face of the reflector frame, and the reflector is mounted in the lens mounting groove;
a plurality of grooves (5-1) are formed in the circumferential outer surface (5-2) of the reflector frame (5), and soldering paste is filled in the grooves (5-1);
the reflector frame (4) comprises a thin-wall round hole (4-1), the reflector frame (5) is coaxially arranged in the thin-wall round hole (4-1), and the outer surface (5-2) of the circumference of the reflector frame (5) is welded with the inner wall surface (4-3) of the thin-wall round hole (4-1);
the circumference of the thin-wall round hole (4-1) is radially provided with a through hole (4-2) matched with the position of the groove (5-1), and the soldering paste in the groove (5-1) is heated through the through hole (4-2);
and the circumferential outer surface (5-2) of the reflector frame (5) and the part to be welded on the inner wall surface (4-3) of the thin-wall round hole (4-1) are subjected to copper plating treatment.
2. The solder attachment arrangement for an adjustable mirror stack as claimed in claim 1, wherein the coating has a thickness of 0.1mm.
3. The welding fixture structure for an adjustable mirror group according to claim 1, wherein the gap between the mirror frame (5) and the mirror frame (4) is 0.6mm.
4. A method of fixing a welded fastening arrangement for an adjustable mirror group according to any of claims 1-3, comprising the steps of:
step 1: solder paste is filled between the reflector group and the reflector frame (4);
step 2: adjusting the spatial pose of the reflector group until the system requirement is met, and fixing the position of the reflector group by using an adjusting tool (3);
and 3, step 3: heating the soldering paste on the upper part of the reflector bracket by a hot air gun for 3-5s;
and 4, step 4: removing the hot air gun, placing the hot air gun at room temperature for about 10s, and removing the connection between the reflector group and the adjusting tool 3;
and 5: and (4) rotating the reflector bracket (4) by 180 degrees, heating and curing the soldering paste on the lower half part of the reflector bracket as in the steps 3 and 4, and thus completing the welding and fixing operation of the reflector set.
5. The welding fixing structure suitable for the adjustable reflector group according to claim 4, wherein in step 1, the groove (5-1) on the outer cylindrical surface of the reflector frame (5) is filled with solder paste, and the reflector group is erected in the thin-walled circular hole of the reflector frame through an adjusting tool; step 3, heating the solder paste from each through hole of the upper half part of the thin wall of the reflector bracket by using a hot air gun for 3-5s; and 5, rotating the reflector frame by 180 degrees, and heating and curing the solder paste from each through hole at the lower half part of the thin wall of the reflector frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110093567.8A CN112882186B (en) | 2021-01-22 | 2021-01-22 | Welding fixing structure and fixing method suitable for adjustable reflector group |
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| CN202110093567.8A CN112882186B (en) | 2021-01-22 | 2021-01-22 | Welding fixing structure and fixing method suitable for adjustable reflector group |
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| CN112882186B true CN112882186B (en) | 2023-03-03 |
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