JP2004094043A - Optical unit, its assembling method and optical unit assembly device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical unit in which the interior of an optical system has a sure tightly closed structure to the exterior, its assembling method and an optical unit assembly device. <P>SOLUTION: A frame member 53 which is provided with a metal section 68 for improving the solder wettability of a tip side unit 1a constituting the optical unit 1 and an optical lens 37 are integrally joined and fixed by melting a splice ring 69 formed with solder in a heating furnace in an inert gas atmosphere and then solidifying again. In that case, the frame members 53 or the like are arranged at fixtures 71, 72 and 73 constituting the optical unit assembly system. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical unit provided in an endoscope capable of being autoclaved, an assembling method thereof, and an optical unit assembling apparatus.
[0002]
[Prior art]
2. Description of the Related Art In recent years, optical devices used in the medical and industrial fields have been required to have a structure with improved airtightness so as to be able to withstand use under severe environments, that is, to be less affected by an external atmosphere. .
[0003]
For example, endoscopes used in the medical field are sterilized each time they are used in order to prevent infectious diseases and the like. In recent years, autoclave sterilization (high-pressure steam sterilization) has become the mainstream as a method for disinfecting and sterilizing the endoscope. This autoclave sterilization is a method in which high-temperature (about 120 ° C. to 135 ° C.) steam is infiltrated into an object to be sterilized under high pressure, and sterilization can be performed immediately after sterilization without complicated work. In addition, there is an advantage that the running cost is low.
[0004]
When disinfecting and sterilizing an endoscope by the autoclave sterilization, it is necessary to prevent water vapor from entering the optical system of the endoscope, and in particular, an optical member that is an optical member and a metal member that holds the optical lens. The joint must be configured to provide sufficient sealing and durability.
[0005]
However, in a conventional joint structure between an optical lens of an endoscope and a metal member, since a resin-based adhesive is used, water vapor easily permeates, and it is difficult to obtain a seal structure suitable for autoclave sterilization.
[0006]
In order to solve the problem, for example, Japanese Patent Application Laid-Open No. 8-122601 discloses a technique in which an optical system structure and an optical member are hermetically bonded with low-melting glass. Japanese Patent Application Laid-Open No. 6-209898 discloses a technique in which a stainless member for inserting a stainless steel is plated with gold for soldering, and the stainless member for inserting the stainless steel and the optical member are soldered. Japanese Patent Application Laid-Open No. Hei 6-82724 discloses a structure in which a frame and an optical member are soldered or fixed with low-melting glass. A groove is formed around the fixing position of the frame, and a spherical low-melting glass or solder is formed in the groove. And a technique of fixing by heating.
[0007]
[Problems to be solved by the invention]
However, as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-122601, even when the structure of the optical system and the optical member are hermetically bonded with low-melting glass, the low-melting glass is deteriorated by repeated autoclave sterilization. There is a possibility that. Then, the airtightness cannot be secured due to the deterioration of the low-melting glass, and water vapor enters the inside of the optical system, fogging may occur inside the optical system, or the optical member may be deteriorated to cause poor visual field. .
[0008]
Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 6-209898, a specific method of soldering is not shown. When heating with a conventional soldering iron, skill is required and a flux is used at the time of soldering. For this reason, a large number of cleaning steps are required to remove the flux, there is a design restriction in consideration of the wraparound of the flux, and there is a risk of corrosion due to the residual flux. This is likely to cause corrosion of the antireflection film and the diaphragm by the AR coating (anti-reflection coating) due to the residual flux, and this corrosion may hinder the obtained optical image. In particular, when the AR coat is corroded and peels off, the flare may increase. Further, there is a possibility that the flux remaining in the gaps between the members flows out, and the flux that flows out is reflected as an image.
[0009]
Furthermore, in the technique disclosed in Japanese Patent Application Laid-Open No. 6-82724, it is complicated to set a spherical solder in the groove. In other words, while a large number of steps are required, it has been difficult to perform stable soldering.
[0010]
In addition, in the above-described prior arts, in any case, no attention has been paid to the problem of flare generation caused by the flow of solder, and no means for solving this problem has been mentioned.
[0011]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical unit in which the inside of an optical system has a reliable sealed structure with respect to the outside, an assembling method thereof, and an optical unit assembling apparatus.
[0012]
[Means for Solving the Problems]
An optical unit according to the present invention includes a frame member provided with a metal part for improving solder wettability at least on an inner peripheral surface, an optical member provided with a metal part for improving solder wettability on an outer peripheral surface, and an outer periphery of the optical member. An optical unit comprising: a bonding material for integrally bonding and fixing a surface and an inner peripheral surface of the frame member with a bonding material;
The joining material is melted in a heating furnace in an inert gas atmosphere and then solidified again, and the outer peripheral surface of the optical member and the inner peripheral surface of the frame member are integrally joined and fixed with the joining material.
[0013]
According to this optical unit, a joint made of a joining material is formed between the metal part of the optical member and the metal part of the frame member.
[0014]
The method of assembling an optical unit includes a step of disposing a frame member having a hole of a predetermined size and having at least an inner peripheral surface provided with a metal part for improving solder wettability at a predetermined position of a frame jig. A step of disposing an optical member having a predetermined outer diameter and a metal part for improving solder wettability on an outer peripheral surface at a predetermined position of a frame member disposed on the frame jig; and Disposing a bonding material formed in an annular shape with respect to an optical member disposed on a frame member disposed on the frame member; and disposing a frame jig in a state where the frame member, the optical member, and the bonding material are disposed in a heating furnace. Arranging a pressing jig for applying a predetermined pressing force to the optical member arranged on the frame jig, and arranging the pressing jig at a predetermined position of the heating furnace arrangement jig, The heating furnace disposing jig in a state where the optical member is pressed by the pressing jig is placed in the heating furnace. Arranged to, the bonding material is melted at a predetermined temperature under an inert gas atmosphere, and a step of joining together then cooled to the said frame member and the optical member via the bonding material.
[0015]
According to this method of assembling the optical unit, an optical unit in which the optical member and the frame member are stably and integrally fixed by the joining material is formed.
[0016]
Further, the optical unit assembling apparatus includes a frame member provided with a metal part for improving solder wettability at least on an inner peripheral surface, an optical member provided with a metal part for improving solder wettability on an outer peripheral surface, and an annularly formed bonding material. A jig for a frame in which is disposed, a jig for a heating furnace in which the jig for the frame is arranged, and a jig for the heating furnace are arranged in a predetermined position of the jig for a heating furnace, and are arranged in the jig for the frame. A pressing jig for pressing the optical member in contact with the optical member, and a heating furnace arrangement jig in a state where the optical member arranged on the frame jig is pressed by the pressing jig, A heating furnace having a heating region for heating the joint material by heating to a predetermined temperature in an inert gas atmosphere and a cooling region for solidifying the molten joint material is provided.
[0017]
According to this assembling apparatus, the optical unit in which the joining member melted in the heating furnace flows between the metal part of the optical member and the metal part of the frame member, and joins the optical member and the frame member via the joining material To form
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 relate to an embodiment of the present invention, FIG. 1 is a cross-sectional view illustrating an optical unit, FIG. 2 is a cross-sectional view showing a state before joining an optical lens and a second lens frame, and FIG. FIG. 4 is a diagram illustrating a continuous hydrogen furnace, FIG. 5 is a diagram illustrating a tip side unit formed through the continuous hydrogen furnace, and FIG. 6 is an optical lens using a different pressing jig. FIG. 5 is a diagram showing a distal end side unit formed by pressing.
[0019]
The optical unit 1 of the present embodiment shown in FIG. 1 is an endoscope optical unit that is assembled to a hard distal end portion that forms an insertion portion of an endoscope (not shown). The optical unit 1 is provided with a solid-state image sensor 2, and an optical member such as an optical glass 31, a plurality of optical lenses 32,... (Hereinafter, abbreviated as apertures) 41,..., 44 and spacing rings 45,. These optical members are respectively adhesively fixed to corresponding tubular frame members 51, 52, 53 formed of stainless steel.
[0020]
The solid-state imaging device 2 is integrally fixed to an element frame 51 which is a frame member by a bonding portion 61. Further, a lead portion 23 extending from a substrate 22 on which an electronic component 21 is mounted is electrically connected to the solid-state imaging device 2. Reference numerals 24 and 25 are signal lines for transmitting a drive signal for driving the image pickup device and an electric signal photoelectrically converted by the image pickup device, and reference numerals 62 and 63 are seals for holding and fixing the substrate 22 in a predetermined state. It is a member.
[0021]
The optical unit 1 includes an objective lens unit 1A on the distal end side and an element unit 1B on the proximal end side. The element unit 1B includes an element frame 51 in which the solid-state imaging element 2 is disposed at a base end, an optical glass 31, an optical lens 32, a substrate 22 on which electronic components 21 are mounted, and the like. On the other hand, the objective lens unit 1A includes a distal unit 1a and a proximal unit 1b, which will be described later.
[0022]
The base unit 1b includes a first lens frame 52, which is a frame member which is internally fitted in a predetermined amount on the inner peripheral surface on the distal end side of the element frame 51, optical lenses 33,... , 47, etc. On the other hand, the distal end unit 1a includes a second lens frame 53, which is a frame member that is externally disposed by a predetermined amount on the distal end outer peripheral surface of the first lens frame 52, the optical lens 37, the diaphragm 44, and the like. It is configured.
[0023]
The optical lens 37 is a lens formed of sapphire, and the optical lens 37 and the second lens frame 53 are integrally fixed in a hermetically sealed state by a solder bonding portion 60 made of a bonding material such as solder. Has become. The second lens frame 53 and the first lens frame 52 are integrally fixed by, for example, an adhesive portion 64. Further, the first lens frame 52 and the element frame 51 are integrally fixed by an adhesive portion 65. The adhesive layers of the adhesive portions 61 and 65 are formed thick to improve watertightness. Thus, the inside of the optical system, which is a space sandwiched between the optical glass 31 and the optical lens 37, is completely watertight with respect to the outside.
[0024]
When the optical lens 37 and the second lens frame 53 are joined in a hermetically sealed state by the solder joint 60, jigs 71, 72, 73 constituting an optical unit assembling apparatus are used.
[0025]
The jig 71 is a lens frame jig 71 having a substantially convex cross-sectional shape, and the second lens frame 53 is arranged on the lens frame jig 71. The lens frame jig 71 is set in a box-shaped heating furnace arrangement jig 81 which is the jig 81. The heating furnace arranging jig 81 is provided inside a continuous hydrogen furnace which is a heating furnace capable of performing a heat treatment in a hydrogen atmosphere using, for example, hydrogen, which is an inert gas, which constitutes an optical unit assembling apparatus. Installed on a conveyor belt. An opening 82 is provided at a predetermined position on the upper surface of the heating furnace arrangement jig 81. A pressing jig 91 having a predetermined mass as the jig 91 is arranged in the opening 82.
The jigs 71, 81, and 91 are made of a heat-resistant material such as carbon, PTFE, stainless steel, and alumina.
[0026]
The lens frame jig 71 includes a small-diameter columnar portion 72 and a large-diameter base portion 73. The columnar portion 72 is formed such that the outer diameter is smaller than the inner diameter of the small hole 53a of the second lens frame 53, and the projecting length is set shorter than the length of the small diameter portion 53a. ing. Thus, when the small diameter portion 53a of the second lens frame 53 is fitted into the columnar portion 72, the base end surface of the second lens frame 53 abuts against the end surface of the base portion 73 of the lens frame jig 71. It is positioned and arranged in a state where it is positioned.
[0027]
In the large-diameter concave portion 53b of the second lens frame 53 positioned on the lens frame jig 71, the stop 44 for preventing the occurrence of flare and the optical lens 37 are sequentially dropped. I have. The outer diameter of the stop 44 is set slightly smaller than the inner diameter of the concave portion 53b of the second lens frame 53. Therefore, by dropping the stop 44 into the recess 53b, the base end surface of the stop 44 is arranged on the bottom surface of the recess 53b.
[0028]
On the other hand, the outer diameter of the optical lens 37 is also set smaller than the inner diameter of the concave portion 53b of the second lens frame 53 by a predetermined size. Therefore, by dropping the optical lens 37 into the concave portion 53b, the base end surface of the optical lens 37 is disposed on the stop 44. Further, a gap is formed between the inner peripheral surface of the concave portion 53b and the outer peripheral surface of the optical lens 37.
[0029]
Further, in the present embodiment, when the optical lens 37 is disposed in the concave portion 53b into which the diaphragm 44 is dropped, the distal end portion 37a of the optical lens 37 moves from the distal end surface 53c of the second lens frame 53. It will be in the state protruded by a predetermined amount. That is, the thickness of the stop 44 combined with the thickness of the optical lens 37 is set to be larger than the depth of the recess 53 b of the second lens frame 53. As a result, an arrangement space is formed on the distal end surface 53c of the second lens frame 53 for disposing the joint ring 69, which is an annular joint ring surrounding the periphery of the distal end portion 37a of the optical lens 37. By arranging the joint ring 69 in this arrangement space, the joint ring 69 is fitted around the distal end portion 37a of the optical lens 37.
[0030]
The joining ring 69 is formed of a solder material such as a gold-tin alloy in a thin plate shape having a predetermined thickness and an outer dimension, and a through hole having a size substantially in contact with the outer peripheral surface of the optical lens 37 is formed in the center. Things.
[0031]
The inner diameter of the joining ring 69 is set smaller than the outer diameter of the distal end face 53c of the second lens frame 53. The volume of the joint ring 69 is set so that the molten solder fills a gap formed between the inner peripheral surface of the concave portion 53b of the second lens frame 53 and the outer peripheral surface of the optical lens 37. It is.
[0032]
The pressing jig 91 is guided by the opening 82 of the heating furnace disposing jig 81, and the tip end surface 92 is disposed in contact with the upper surface of the optical lens 37. In this state, the optical lens 37 is always pressed by the mass of the pressing jig 91. Therefore, the diaphragm 44 disposed on the base end surface side of the optical lens 37 is pressed against the bottom surface of the concave portion 53b to be in a close contact state. Therefore, when the joining ring 69 is melted, the optical lens 37 is prevented from being lifted up by the solder in the melted state, and the solder is externally connected between the base end surface of the diaphragm 44 and the bottom surface of the concave portion 53b. Is prevented from flowing out.
[0033]
When the jigs 71, 81 and 91 assembled in the continuous hydrogen furnace are arranged, the contact surface between the joining ring 69 and hydrogen is enlarged, so that the tip end surface 92 of the pressing jig 91 is increased. Is set smaller than the outer diameter of the optical lens 37. Therefore, in the pressing jig 91 of the present embodiment, a tapered portion is formed at the tip.
[0034]
As shown in FIG. 3, a metal portion 68 that has been subjected to a plating process such as nickel plating or gold plating with good solder wettability is provided on the distal end surface 53c of the second lens frame 53 and the inner peripheral surface of the concave portion 53b. On the other hand, on the outer peripheral surface of the optical lens 37a, there is provided a metal part 68 formed of a metal coating such as nickel or gold having good solder wettability by vacuum deposition, sputtering or the like. On the other hand, the outer peripheral surface of the second lens frame 53 exposes stainless steel so that the solder wettability is poor. This allows the molten solder to flow to the metal portion 68 without flowing to the outer peripheral surface side.
[0035]
In order to prevent the molten solder from flowing into the hole 53a of the second lens frame 53, a plating process such as black chrome plating or the like, which has poor solder wettability and low light reflection on the surface of the stop 44, is used. Has been given. In addition, the stop 44 and the optical lens 37 are brought into close contact with each other, and the stop 44 is brought into close contact with the bottom surface of the concave portion 53b of the second lens frame 53. It is prevented from flowing to the portion 53a side.
[0036]
In order to make the outer peripheral surface of the second lens frame 53 an exposed surface of stainless steel, when performing the plating process, the main portion is masked in advance, or after the plating process is completed, the plating applied to the portion is cut. Alternatively, a work of peeling off by sandblasting or the like is performed. When the optical unit 1 has a structure in which the stop 44 is not disposed, the base end surface of the optical lens 37 and the bottom surface of the concave portion 53b of the second lens frame 53 are brought into close contact with each other so that the solder is formed. It is prevented from flowing toward the hole 53a.
[0037]
When the optical lens 37 is joined to the concave portion 53b of the second lens frame 53 in a sealed state, a continuous hydrogen furnace 100 shown in FIG. 4 is used. The continuous hydrogen furnace 100 is provided with a furnace inlet 101 and a furnace outlet 102, and a muffle 103 connecting the furnace inlet 101 and the furnace outlet 102 is filled with hydrogen. Further, a conveyor belt 104 indicated by a broken line that moves at a predetermined speed is provided in the muffle 103.
[0038]
A heating region 105 and a cooling region 106 are provided in the muffle 103. A hydrogen discharge port 107 is provided between the heating area 105 and the cooling area 106. Further, an oxygen concentration meter (not shown) is mounted in the muffle 103. Then, a predetermined amount of hydrogen is discharged from the hydrogen discharge port 107, the oxygen concentration in the furnace is set to, for example, 50 ppm or less, and the metal parts of the second lens frame 53 and the optical lens 37 are activated. The joining by 69 is performed.
[0039]
Here, a process of integrally joining the optical lens 37 and the second lens frame 53 by solder will be described.
First, the hole 53a of the second lens frame 53 is arranged on the columnar portion 72 of the frame jig 71. Then, a diaphragm 44 made of a ring-shaped member having a predetermined outer diameter is dropped and arranged in the concave portion 53b of the second lens frame 53. Next, the optical lens 37 having a predetermined outer diameter is dropped into the concave portion 53b of the second lens frame 53. Thereafter, the joining ring 69 is externally fitted to the distal end portion 37a of the optical lens 37 projecting from the distal end surface 53c of the second lens frame 53.
[0040]
Next, the optical lens 37 is disposed in the concave portion 53b of the second lens frame 53, and the frame jig 71 in a state where the joining ring 69 is disposed on the outer peripheral side of the optical lens 37 is moved to the heating furnace disposing jig 81. At a predetermined position. Thereafter, a pressing jig 91 is arranged in the opening 82 of the heating furnace arrangement jig 81. Then, the optical lesbian 37 is pressed against the bottom surface of the concave portion 53b by the weight of the pressing jig 91. As a result, the optical lens 37 and the stop 44 are in close contact with each other, and the stop 44 and the bottom surface of the concave portion 53b of the second lens frame 53 are in close contact with each other.
[0041]
Next, the heating furnace arrangement jig 81 assembled in a state where the optical lens 37 is pressed by the pressing jig 91 is arranged on the conveyor belt 104 passing near the furnace entrance 101. Then, the heating furnace arrangement jig 81 is transferred to the heating area 105 in the muffle 103 under a hydrogen atmosphere. When the heating furnace arrangement jig 81 passes through the heating area 105 heated to a predetermined temperature for a predetermined time, the second lens frame 53 and the metal part 68 of the optical lens 37 are activated. At the same time, the joining ring 69 is heated and changes to a molten solder.
[0042]
Then, the molten solder does not flow through the outer peripheral surface of the second lens frame 53 where the stainless steel is exposed and the solder wettability is poor. It flows into the gap formed between the surface and the inner peripheral surface of the second lens frame 53 provided with the metal part 68.
[0043]
At this time, the diaphragm 44 is plated to deteriorate the solder wettability, and the diaphragm 44 and the bottom surface of the concave portion 53b and the diaphragm 44 and the base end surface of the optical lens 37 are substantially in close contact with each other. The molten solder is prevented from flowing out to the hole 53a side of the second lens frame 53.
As a result, a certain amount of the molten solder is accumulated in a gap formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53b of the second lens frame 53.
[0044]
Next, the heating furnace arrangement jig 81 passes through the cooling region 105 at a predetermined temperature for a predetermined time. As a result, the molten solder accumulated in the gap formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53b of the second lens frame 53 is gradually solidified, and finally becomes optically A solder joint 60 for integrally joining the lens 37 and the second lens frame 53 is formed to form the distal end unit 1a shown in FIG.
[0045]
Thereafter, the base unit 1b is integrally fixed to the front unit 1a to form the objective lens unit 1A, and then the base unit 1b of the objective lens unit 1A and the element unit 1B in the optical axis direction. The optical unit 1 is formed by performing position adjustment and fixing integrally.
[0046]
In the present embodiment, the heating furnace used for melting the bonding ring 69 and integrally bonding the optical lens 37 and the second lens frame 53 is the continuous hydrogen furnace 100. The present invention is not limited to the continuous hydrogen furnace 100, but may be a batch hydrogen furnace, a continuous nitrogen furnace capable of performing heat treatment under an inert gas such as a nitrogen atmosphere, a batch nitrogen furnace, or a vacuum furnace. The bonding described above is possible.
[0047]
Further, when the melting temperature of the joining ring 69 is high, the optical lens 37 is cooled in a cooling step of cooling the molten solder due to a difference in thermal expansion coefficient between the second lens frame 53 and the optical lens 37. May be broken by the stress from the second lens frame 53. For this reason, the melting temperature of the joining ring 69 is set to 400 ° C. or lower, thereby preventing the occurrence of the problem.
[0048]
As described above, at least the metal portion having the metal film formed on the outer peripheral surface of the optical lens is provided, and the metal portion by plating is provided on the inner peripheral surface and the distal end surface of the concave portion of the second lens frame in which the optical lens is disposed. The second lens frame and the optical lens, the joining ring, and the stop are arranged on a frame jig, the frame jig is assembled to a heating furnace arrangement jig, and the pressing jig is attached to the heating furnace arrangement jig. By melting and solidifying the joint ring in a hydrogen atmosphere of a continuous hydrogen furnace with the components assembled, the optical lens and the second lens frame that constitute the front end unit are securely and stably joined by soldering can do.
[0049]
In addition, by setting the volume of the joining ring so as to fill the gap between the concave portion of the second lens frame into which the joining ring melts and flows and the optical lens, the solder is provided between the optical lens and the second lens frame. A joint can be formed to reliably perform the joint in a sealed state.
[0050]
Further, the distal end unit and the proximal end unit are provided with an adhesive portion and fixed to form an objective lens unit, while the proximal end unit and the imaging unit are provided with a thick adhesive portion and fixed integrally. In addition, by providing and fixing an image sensor thickly formed on the element frame constituting the image pickup unit, an optical lens joined to the distal end side unit by solder and an optical glass disposed on the front surface of the image pickup element are provided. The inside of the optical system sandwiched between the two can be completely watertight with respect to the outside.
[0051]
Thus, even if the endoscope after use is repeatedly subjected to autoclave sterilization, the invasion of water vapor into the optical system is reliably prevented. Therefore, deterioration and peeling of the adhesive are prevented, and a good visual field is secured.
[0052]
In addition, the optical lens disposed in the concave portion of the second lens frame is pressed by a pressing jig to bring the base end surface side of the optical lens into close contact with the aperture member or the bottom surface of the concave portion, so that the melt flowing into the gap is formed. The solder in the state can be reliably prevented from flowing out to the hole side of the second lens frame. As a result, occurrence of an observation field failure due to the solder flowing toward the hole of the second lens frame is reliably prevented.
[0053]
When the pressing jig is formed of a material having poor solder wettability, the diameter of the contact surface in contact with the optical lens 37 is made larger than the outer diameter of the optical lens 37 as shown in FIG. The tool jig 91A may be formed. Accordingly, when the volume of the joint ring 69 is slightly larger than the gap formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53b of the second lens frame 53, the optical lens The solder joint portion 60 can be formed by preventing the solder from protruding further toward the distal end than the distal end surface of the solder 37. Reference numeral 53d denotes a solder pool into which the molten solder flows.
[0054]
Another configuration example of the distal end unit will be described with reference to FIGS. 7 and 8.
FIG. 7 is a cross-sectional view showing a state before joining the optical lens and the second lens frame, and FIG. 8 is a view showing a front-end-side unit formed by passing through a continuous hydrogen furnace.
[0055]
As shown in FIG. 7, in the present embodiment, the second lens frame 53A protrudes from the optical lens 37. Then, a joint ring 69 for integrally joining the optical lens 37 and the second lens frame 53A is arranged in the concave portion 53e of the second lens frame 53A. That is, the joining ring 69 is placed on the optical lens 37. At this time, a predetermined gap is formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53b of the second lens frame 53A.
[0056]
Specifically, the depth of the concave portion 53e is set to be larger than the sum of the thickness of the aperture member 44, the thickness of the optical lens 37, and the thickness of the joining ring 69. The outer diameter of the joining ring 69 and the outer diameter of the tip of the pressing jig 91B are set smaller than the inner diameter of the recess 53e.
[0057]
The second lens frame 53A is not provided with an exposed portion of stainless steel by plating peeling or plating masking. The pressing jig 91B is formed of a material having poor solder wettability. Other configurations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.
[0058]
As shown in FIG. 7, the heating furnace arrangement jig 81 in the assembled state is arranged on the conveyor belt of the continuous hydrogen furnace to perform heating and cooling. Then, first, the solder melted in the heating region 105 is kept pressed by the pressing jig 91B, so that the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53e of the second lens frame 53A as shown in FIG. It flows into the gap formed between the surface.
[0059]
Next, when the heating furnace disposing jig 81 passes through the cooling region 106, the solder in a molten state is solidified, and the solder joint 60 is formed to form the distal end side unit 1c.
[0060]
Although a part of the melted joining ring 69 may remain on the optical lens 37, the residue is easily removed by wiping and cleaning. The volume of the joint ring 69 is set so as not to protrude from the end face 53f of the second lens frame 53A.
[0061]
As described above, the joining ring is dropped into the concave portion and placed on the upper surface of the optical lens, so that it is unnecessary to form a space for disposing the joining ring, and the thickness of the second lens frame is reduced. A diameter optical unit can be provided. In addition, the step of removing the plating of the second lens frame or the like is not required, and the cost can be reduced. Other functions and effects are the same as those of the above-described embodiment.
[0062]
Another configuration example of the distal end unit will be described with reference to FIGS. 9 and 10.
FIG. 9 is a cross-sectional view showing a state before joining the optical lens and the second lens frame, and FIG. 10 is a view showing a tip side unit formed by passing through a continuous hydrogen furnace.
[0063]
As shown in FIG. 9, in the present embodiment, a solder pool 53g is provided at the tip of the second lens frame 53B, and a joining ring 69 is arranged in the solder pool 53g. At this time, the joining ring 69 is fitted on the outer peripheral surface of the optical lens 37 protruding from the concave portion 53h. The aperture member 44 and the optical lens 37 are dropped into the concave portion 53h, and a predetermined distance is provided between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53h of the second lens frame 53B. Is formed.
[0064]
Specifically, the depth dimension of the concave portion 53h is set to be smaller by a predetermined amount than a value obtained by combining the thickness dimension of the diaphragm member 44 and the thickness dimension of the optical lens 37. The depth of the solder pool 53g is set larger than the thickness of the joining ring 69, and the inner diameter is set larger than the outer diameter of the joining ring 69. Therefore, when the joining ring 69 is melted, the molten solder is reliably prevented from overflowing from the concave portion 53h, so that the stainless steel is exposed on the second lens frame 53B by peeling or plating masking. There is no place. Other configurations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.
[0065]
As shown in FIG. 9, the heating furnace arrangement jig 81 in the assembled state is arranged on a conveyor belt of the continuous hydrogen furnace to perform heating and cooling. As a result, the joining ring 69 melted in the heating region 105 is placed in a gap formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the concave portion 53h of the second lens frame 53B as shown in FIG. While flowing in, a part spreads in the solder pool 53g. Then, when the heating furnace disposing jig 81 passes through the cooling region 106, the solder in the molten state is solidified, and the solder joint 60 is formed to form the distal end unit 1d. Although a part of the melted joining ring 69 may remain on the optical lens 37, the residue is easily removed by wiping and cleaning.
[0066]
As described above, by providing the solder pool at the tip of the second lens frame, a slight increase or decrease due to the processing accuracy of the gap formed between the outer peripheral surface of the optical lens and the inner peripheral surface of the concave portion of the second lens frame. Irrespective of this, a sufficient amount of solder for solder joining is always supplied in a stable state, and a stable joining result can be obtained easily and reliably. As a result, the product yield can be improved and the cost of parts can be reduced. Other functions and effects are the same as those of the above-described embodiment.
[0067]
Another configuration example of the distal end unit will be described with reference to FIGS.
FIG. 11 is a cross-sectional view showing a state before joining the optical lens and the second lens frame, and FIG. 12 is a view showing a tip side unit formed by passing through a continuous hydrogen furnace.
[0068]
As shown in FIG. 11, in the present embodiment, the second lens frame 53C is formed in a pipe shape, and the joining ring 69 and the optical lens 37 are placed on the distal end surface of the second lens frame 53C. The lens 37 and the second lens frame 53C are integrally joined. The inner peripheral surface and the outer peripheral surface of the second lens frame 53C are in a state where the stainless steel is exposed by peeling off the plating or plating masking. That is, in the present embodiment, the metal portion 68 is provided on the distal end surface of the second lens frame 53C, and the metal portion 68 is formed on the base end surface of the optical lens 37 by a metal coating formed by vacuum deposition, sputtering, or the like. The volume of the joining ring 69 is set so as not to protrude from the front end surface of the second lens frame 53C.
[0069]
As shown in FIG. 11, the heating furnace arrangement jig 81 in the assembled state is arranged on the conveyor belt of the continuous hydrogen furnace to perform heating and cooling. As a result, as shown in FIG. 12, the molten bonding ring 69 is solidified to form the solder bonding portion 60, and the distal end unit 1e in which the optical lens 37 is bonded to the distal end surface of the second lens frame 53C is formed. Is done.
[0070]
As described above, by forming the second lens frame into a pipe shape and joining the optical lens to the tip end surface with solder, it is possible to increase the diameter of the optical lens or the diameter of the second lens frame. . Further, since the second lens frame is formed in a pipe shape, it is possible to reduce the cost of parts. Other operations and effects are the same as those of the above-described embodiment.
[0071]
With reference to FIGS. 13 and 14, another configuration example of the distal end unit will be described.
FIG. 13 is a cross-sectional view showing a state before joining the optical lens and the second lens frame, and FIG. 14 is a view showing a front-end side unit formed by passing through a continuous hydrogen furnace.
[0072]
As shown in FIG. 13, in the present embodiment, one through hole 53k is formed in the second lens frame 53D, and the optical lens 37 is joined to a predetermined position on the side surface of the through hole 53k by soldering. Therefore, a frame jig 71A in which the projection size of the columnar portion 72a is set such that the optical lens 37 projects a predetermined amount from the tip end surface of the second lens frame 53D is used. Then, the optical lens 37 is disposed in a space defined by the front end surface of the frame jig 71A and the inner peripheral surface of the second lens frame 53D, and the second lens is disposed in the same manner as in the embodiment shown in FIG. The joining ring 69 is placed on the front end surface of the frame 53D.
[0073]
The second lens frame 53D is provided with an exposed portion of stainless steel by plating off or masking. Further, in the present embodiment, the outer peripheral surface of the columnar portion 72a of the frame jig 71A is set to a size substantially in contact with the inner peripheral surface of the through hole 53k of the second lens frame 53D. That is, it is possible to prevent the molten solder from flowing between the outer peripheral surface of the columnar portion 72a and the inner peripheral surface of the through hole 53k. Further, the frame jig 71A is formed of a material having poor solder wettability, such as stainless steel, or the surface of the jig is subjected to a surface treatment such as black chrome plating, which deteriorates solder wettability. Further, the volume of the joining ring 69 is set to an amount that does not protrude from the distal end surface of the second lens frame 53D.
[0074]
As shown in FIG. 13, the heating furnace arrangement jig 81 in the assembled state is arranged on the conveyor belt of the continuous hydrogen furnace to perform heating and cooling. As a result, the bonding ring 69 melted in the heating region 105 is placed in a gap formed between the outer peripheral surface of the optical lens 37 and the inner peripheral surface of the through hole 53k of the second lens frame 53D as shown in FIG. Flow in. At this time, since the outer peripheral surface of the columnar portion 72a of the frame jig 71A having poor solder wettability is in contact with the inner peripheral surface of the through-hole 53k of the second lens frame 53D, the solder in the molten state is removed from the columnar portion 72a. And accumulates in the gap without flowing out to the side peripheral surface side.
[0075]
When the heating furnace arrangement jig 81 passes through the cooling region 106, the molten solder accumulated in the gap is solidified to form the solder joint 60, and the optical lens 37 is moved to the second lens frame. A front end unit 1f joined to a predetermined position on the front end side of 53D is formed. The volume of the joining ring 69 is set so as not to protrude from the front end surface of the second lens frame 53D.
[0076]
As described above, while one through-hole is provided to form the second lens frame, a frame jig having a columnar portion having a predetermined protruding length and arranged to be in contact with the through-hole of the second lens frame is used. Thereby, the optical lens can be joined to the predetermined position of the through hole by soldering. As a result, the cost of parts can be reduced by simplifying the structure of the second lens frame. Other operations and effects are the same as those of the above-described embodiment.
[0077]
15 and 16, the outer peripheral surface of the columnar portion 72a of the frame jig 71A does not come into contact with the inner peripheral surface of the through hole 53k, so that The tip unit can be formed by preventing the molten solder from flowing into the device.
[0078]
FIG. 15 is a diagram illustrating still another configuration example of the distal end unit, and FIG. 16 is a diagram illustrating still another configuration example of the distal end unit.
[0079]
That is, the diaphragm member 44 formed of, for example, a material having poor solder wettability or subjected to a surface treatment that deteriorates solder wettability is disposed on the base end surface side of the optical lens 37 shown in FIG. As described above, the notch 53m having a predetermined width is formed at a predetermined position of the through hole 53k of the second lens frame 53D, so that the metal portion 68 for improving the solder wettability is peeled off, and the molten solder is provided on the through hole 53k side. Will not flow out.
[0080]
Here, with reference to FIG. 17, a configuration example of the distal end unit including the optical lens and the second lens frame and features of the configuration will be described. FIG. 17A is a diagram illustrating a configuration example of a distal end unit in which a diaphragm member is disposed, and FIG. 17B is a diagram illustrating another configuration of a distal end unit in which a diaphragm member is disposed.
For example, as shown in FIG. 17 (a), an optical lens 121 formed of sapphire having a metal film formed of chromium-nickel-gold on the outer peripheral surface and a front lens frame 122 plated with gold on the entire inner surface are soldered. When joining to form the distal end unit 120, the aperture member 123, which has been subjected to surface treatment by black chrome plating, is disposed in a substantially close contact state with the bottom surface of the concave portion 124. As a result, the solder bonding portion 126 is formed without the solder flowing out to the hole 125 side, and the distal end side unit 120 is formed. As shown in FIG. 17B, the diameter of the aperture 127 of the aperture member 123a is made larger than the diameter of the spherical surface 128 of the optical lens 121 to form the distal end unit 120A. 128 cleaning can be performed.
[0081]
Then, as shown in FIG. 18 illustrating another configuration of the optical unit, the proximal unit 130 inserted and disposed on the proximal side of the distal unit 120A is replaced with a proximal lens frame 131 and an optical lens 132. , 135, apertures 136, 137, spacing rings 138,..., 140, etc., and the diameter of the aperture 141 on the distal end surface of the base-side lens frame 131 is defined by the diameter of the spherical surface 128 of the optical lens 121. The second throttle member 142 smaller than the size is arranged and configured. Thus, when the proximal unit 130 is disposed in the distal unit 120A, the second stop member 142 is disposed behind the optical lens 132, so that flare can be reduced.
[0082]
When the distal unit 120A and the proximal unit 130 are integrally formed as shown in FIG. 19, the distal surface 145 of the outer peripheral step 144 of the proximal lens frame 131 and the proximal surface of the distal lens frame 122 are formed. A groove 147 for applying an adhesive is formed between the groove 146 and the groove 147. Therefore, a thicker adhesive portion 148 can be easily formed by applying an adhesive to the groove 147. This reduces the penetration of vapor into the optics.
[0083]
As shown in the drawing for explaining the optical lens of FIG. 20, the optical lens 121 has a first chamfered surface 121a and a second chamfered surface 121b formed larger than the first chamfered surface 121a. The surface of the second chamfered surface 121b is grained, and the chamfered surfaces 121a and 121b are also provided with a metal film.
[0084]
By the way, as described above, in the lens unit in which the optical lens and the lens frame are integrally formed by providing the solder joint, it is necessary to check the airtight state of the joint. Therefore, conventionally, the completed lens unit 180 is set in an airtightness check tool 181, as shown in the figure for explaining the airtightness check jig in FIG. 21, and the airtightness check is performed by performing suction.
[0085]
However, the O-ring 184 is arranged so that the airtightness check tool 181 is in close contact with the holder body 182, the unit receiver 183 disposed in the holder body 182, and the outer periphery of the lens frame 135 of the lens unit 180 disposed at the lower end of the unit receiver 183. And a pressing member 186 which is attached to the holder main body 182 by screwing and presses the unit receiver 183 to deform the O-ring 184. Therefore, when the pressing member 186 is screwed into the holder main body 182 and the unit receiver 183 is moved to deform the ring 184, the deformation state of the ring 184 is changed, and the lens unit to be inspected is changed. The problem that the arrangement of the 180 in the airtightness check jig 181 is not constant has occurred, and the airtightness check cannot be easily performed.
[0086]
22A and 22B are diagrams illustrating an airtightness check device, FIG. 22A is a diagram illustrating an airtightness check device using an O-ring as an elastic member, and FIG. 22B is a diagram illustrating the use of a tapered elastic member as an elastic member. FIG. 22 (c) is a diagram illustrating an airtightness check device using an elastic pipe member as an elastic member.
[0087]
For this reason, the airtightness check device 150 is configured as shown in FIGS. 22 (a) to 22 (c). The hermetic check tool 150 has a through hole 151 in the axial direction, a check tool main body 153 having a convex portion 152 disposed on the inner peripheral surface side of the lens frame 158 of the lens unit 157, And an elastic member 154 disposed on the portion 152. Reference numeral 156 denotes a solder joint.
[0088]
The elastic member 154 is an O-ring arranged in the groove in FIG. 22 (a), a tapered elastic member which tapers toward the tip end in FIG. 22 (b), and in FIG. 22 (c). The elastic pipe member is disposed on the concave and convex side surface formed on the convex portion 152 and forms a concave and convex portion on the side surface.
[0089]
The height dimension of the convex portion 152 is such that when the opening-side end surface of the lens unit 157 is in contact with the base 155, it does not contact the optical lens 159.
[0090]
Here, an operation of checking the airtight state of the lens unit will be described.
First, the lens unit 157 to be inspected is arranged on the convex portion 152 of the airtightness check device 150. Then, the side surface of the elastic member 154, which is, for example, a tapered elastic member provided on the convex portion 152, and the inner peripheral surface of the lens frame 158 come into close contact with each other. Next, suction is performed through the axial through-hole 151 in this state. Thus, the airtight state of the airtight joint 156 can be checked.
[0091]
As described above, the airtightness check tool is formed in a stepped shape having a convex portion having a predetermined height in which the elastic member is disposed, so that the lens unit to be inspected is pressed into the convex portion having the elastic member in a predetermined state. Accordingly, it is possible to inspect the airtightness check state smoothly and quickly.
[0092]
By the way, when the optical lens is fixed to the lens frame by bonding, soldering, or the like, conventionally, as shown in the diagram illustrating the configuration of the optical unit in FIG. The corresponding optical lenses 164 and 165 are arranged in the first concave portion 161 and the second concave portion 162, respectively, and thereafter, the adhesive portions 166 are respectively provided to integrally fix the optical lenses 164 and 165 to the lens frame 160.
[0093]
However, when the curvature is different like the optical lens 164 disposed in the first concave portion 161, when the curved surface Ra having a large curvature is brought into contact with the inner peripheral convex portion 163, when the curved surface Rb having a small curvature is brought into contact. In comparison, a more stable arrangement holding state could not be obtained. Further, since the optical parts 164 and 165 are arranged in the first concave part 161 and the second concave part 162 and then the bonding part 166 is provided, there is a problem that the operation is complicated.
[0094]
In order to solve this problem, in the lens unit 170 of the present embodiment, two concave portions 171 and 172 are formed in the lens frame 173 as shown in the diagram illustrating the configuration of the optical unit in FIG. A ring-shaped spacing ring 176 made of, for example, a metal is arranged between the first optical lens 174 and the second optical lens 175 which are arranged at the same position. The first concave portion 171 and the second concave portion 172 formed in the lens frame 173 are formed by operating a processing tool from one side. A lens holding portion 177 is provided on the bottom surface of the first concave portion 171 by forming a through hole 176 having a predetermined hole diameter by operating a processing tool from one side.
[0095]
Here, a procedure for forming the lens unit 170 will be described.
First, the first optical lens 174 is dropped into the first concave portion 171 of the lens frame 173. Then, the curved surface Rb having a small curvature comes into contact with the lens holding portion 177, and the first optical lens 174 is arranged in the first concave portion 171 in a stable arrangement and holding state. Next, the interval ring 176 is dropped into the second concave portion 172. Then, the base end surface of the spacing ring 176 contacts the bottom surface of the second concave portion 172 and the curved surface Rb having a small curvature. Next, the second optical lens 175 is dropped into the second concave portion 172. Then, the base end surface of the second optical lens 175 is placed in the second concave portion 172 in a state of being in contact with the front end surface of the spacing ring. Finally, a solder joint 178 is provided between the second optical lens 175 and the lens frame 173 to complete the lens unit 170.
[0096]
As described above, by operating the processing tool from one direction side to form the first concave portion and the second concave portion, the coaxial processing accuracy between the first concave portion and the second concave portion can be improved. In addition, the through hole is formed in the first concave portion by operating the processing tool from one direction side, and the lens holding portion with which the curved surface of the optical lens abuts is integrally provided to stabilize the optical lens arranged in the first concave portion. The angle of view can be stabilized by arranging in the fixed holding state. Further, when the lens unit is configured, the first optical lens, the spacing ring, and the second optical lens are dropped into the first concave portion and the second concave portion formed in the lens frame, and the optical lens is disposed on the lens frame in one step. It can be performed. Also, a lens unit can be configured by providing only one solder joint to the lens frame.
[0097]
As a result, the accuracy of the lens frame and the workability can be improved, so that the assemblability of the lens unit can be improved and the eccentricity of the optical lens disposed on the lens frame can be prevented.
[0098]
It should be noted that the present invention is not limited to only the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.
[0099]
[Appendix]
According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.
[0100]
(1) A frame member provided with a metal part for improving solder wettability on the inner peripheral surface, an optical member provided with a metal part for improving solder wettability on the outer peripheral surface, an outer peripheral surface of the optical lens, and the frame member An optical unit comprising a joining material for integrally joining and fixing an inner peripheral surface of the joining member with a joining material,
An optical unit in which the bonding material is melted in a heating furnace under an inert gas atmosphere and then solidified again to integrally bond and fix an outer peripheral surface of the optical lens and an inner peripheral surface of the frame member with a bonding material.
[0101]
(2) The optical unit according to attachment 1, wherein the bonding material is a bonding ring formed of a solder material or a brazing material formed in a ring shape so as to be disposed on the outer peripheral side of the optical lens.
[0102]
(3) The optical unit according to supplementary note 2, wherein a stop member formed of a material having poor solder wettability or subjected to a surface treatment for reducing solder wettability is disposed on a base end surface side of the optical member.
[0103]
(4) a step of arranging a frame member having a hole of a predetermined size and having a metal part on the inner peripheral surface for improving solder wettability at a predetermined position of a frame jig;
At a predetermined position of the frame member arranged in the frame jig, a step of arranging an optical member having a metal portion for improving solder wettability on the outer peripheral surface with a predetermined outer diameter,
A step of arranging an annularly formed bonding material for an optical member arranged on a frame member arranged on the frame jig,
A step of arranging the frame member, the optical member and the frame jig in a state where the bonding material is arranged in the heating furnace arrangement jig,
A step of disposing a pressing jig for applying a predetermined pressing force to the optical member arranged on the frame jig at a predetermined position of the heating furnace arrangement jig,
A heating furnace disposing jig in a state where the optical member is pressed by the pressing jig is disposed in a heating furnace, the bonding material is melted at a predetermined temperature under an inert gas atmosphere, and then cooled to cool the bonding material. A step of integrally joining the optical member and the frame member via a joining material,
An assembling method of an optical unit having:
[0104]
(5)
After the step of arranging the frame member at a predetermined position of the frame jig, a step of arranging a throttle member formed to have a predetermined outer diameter and an inner diameter on the frame member arranged on the frame jig is provided. 5. The method of assembling the optical unit according to 4.
[0105]
(6) The method of assembling the optical unit according to appendix 5, wherein the aperture member is formed by applying a material having poor solder wettability or a surface treatment to reduce the solder wettability to the surface.
[0106]
(7) A frame member provided with a metal part for improving solder wettability on the inner peripheral surface, an optical member provided with a metal part for improving solder wettability on the outer peripheral surface, and a frame for a ring-shaped joining material to be disposed Jig and
A heating furnace arrangement jig on which the frame jig is arranged,
A pressing jig that is arranged at a predetermined position of the heating furnace arrangement jig and abuts on the optical member arranged on the frame jig to press the optical member,
A heating furnace arranging jig in a state where the optical member arranged on the frame jig is pressed by the pressing jig is arranged, and is heated to a predetermined temperature under an inert gas atmosphere to melt the bonding material. A heating furnace having a heating region and a cooling region for solidifying the molten bonding material,
An optical unit assembling apparatus comprising:
[0107]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an optical unit in which the inside of an optical system has a reliable sealed structure with respect to the outside, an assembling method thereof, and an optical unit assembling apparatus.
[Brief description of the drawings]
FIGS. 1 to 6 relate to an embodiment of the present invention, and FIG. 1 is a cross-sectional view illustrating an optical unit.
FIG. 2 is a cross-sectional view showing a state before joining the optical lens and a second lens frame.
FIG. 3 is an enlarged view around an optical lens.
FIG. 4 is a diagram illustrating a continuous hydrogen furnace.
FIG. 5 is a diagram showing a tip side unit formed by passing through a continuous hydrogen furnace.
FIG. 6 is a view showing a distal end unit formed by pressing an optical lens with different pressing jigs;
7 and 8 are diagrams illustrating another configuration example of the distal end unit, and FIG. 7 is a cross-sectional view illustrating a state before the optical lens and the second lens frame are joined.
FIG. 8 is a diagram showing a tip side unit formed by passing through a continuous hydrogen furnace.
9 and 10 are diagrams illustrating another configuration example of the distal end unit, and FIG. 9 is a cross-sectional view illustrating a state before the optical lens and the second lens frame are joined.
FIG. 10 is a diagram showing a tip side unit formed by passing through a continuous hydrogen furnace.
FIGS. 11 and 12 are diagrams illustrating still another configuration example of the distal end unit. FIG. 11 is a cross-sectional view illustrating a state before the optical lens and the second lens frame are joined.
FIG. 12 is a diagram showing a tip side unit formed by passing through a continuous hydrogen furnace.
FIG. 13 is a diagram illustrating another configuration example of the distal end unit with reference to FIGS. 13 and 14. FIG. 13 is a cross-sectional view illustrating a state before the optical lens and the second lens frame are joined.
FIG. 14 is a diagram showing a tip side unit formed by passing through a continuous hydrogen furnace.
FIG. 15 is a view for explaining still another configuration example of the distal end unit.
FIG. 16 is a view for explaining still another configuration example of the distal end unit.
FIG. 17 is a view for explaining an example of the configuration of a distal end unit composed of an optical lens and a second lens frame, and the features of the configuration;
FIG. 18 illustrates another configuration of the optical unit.
FIG. 19 is a diagram illustrating a bonding portion provided in the optical unit.
FIG. 20 illustrates an optical lens.
FIG. 21 is a view for explaining a conventional airtightness check jig.
FIG. 22 is a diagram illustrating an airtightness check tool.
FIG. 23 illustrates a configuration of a conventional optical unit.
FIG. 24 illustrates a configuration of an optical unit.
[Explanation of symbols]
1. Optical unit
1A Objective lens unit
1a: Tip side unit
37 ... Optical lens
53 ... second lens frame
60 ... Solder joint
68 ... metal part
69… joining ring
71 ... Jig for lens frame
81 ... heating jig
91 ... Pressing jig

Claims (3)

A frame member provided with a metal part for improving solder wettability at least on an inner peripheral surface, an optical member provided with a metal part for improving solder wettability on an outer peripheral surface, and an outer peripheral surface of the optical member and an inner part of the frame member. An optical unit comprising:
The outer peripheral surface of the optical member and the inner peripheral surface of the frame member are integrally joined and fixed by a joining material after the joining material is melted in a heating furnace under an inert gas atmosphere and then solidified again. Optical unit. A step of arranging a frame member having a hole of a predetermined size and a metal member provided with a metal part for improving solder wettability at least on an inner peripheral surface at a predetermined position of a frame jig,
At a predetermined position of the frame member arranged in the frame jig, a step of arranging an optical member having a metal portion for improving solder wettability on the outer peripheral surface with a predetermined outer diameter,
A step of arranging an annularly formed bonding material for an optical member arranged on a frame member arranged on the frame jig,
A step of arranging the frame member, the optical member and the frame jig in a state where the bonding material is arranged in the heating furnace arrangement jig,
A step of disposing a pressing jig for applying a predetermined pressing force to the optical member arranged on the frame jig at a predetermined position of the heating furnace arrangement jig,
A heating furnace disposing jig in a state where the optical member is pressed by the pressing jig is disposed in a heating furnace, the bonding material is melted at a predetermined temperature under an inert gas atmosphere, and then cooled to cool the bonding material. A step of integrally joining the optical member and the frame member via a joining material,
A method for assembling an optical unit, comprising: A frame member provided with a metal part for improving solder wettability at least on an inner peripheral surface, an optical member provided with a metal part for improving solder wettability on an outer peripheral surface, and a frame jig on which an annular bonding material is arranged When,
A heating furnace arrangement jig on which the frame jig is arranged,
A pressing jig that is arranged at a predetermined position of the heating furnace arrangement jig and abuts on the optical member arranged on the frame jig to press the optical member,
A heating furnace arranging jig in a state where the optical member arranged on the frame jig is pressed by the pressing jig is arranged, and is heated to a predetermined temperature under an inert gas atmosphere to melt the bonding material. A heating furnace having a heating region and a cooling region for solidifying the molten bonding material,
An optical unit assembling apparatus comprising:

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