JP2005055811A - Optical member, optical apparatus having the optical member incorporated therein, and method of assembling the optical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical member, an optical apparatus and a method of assembling the optical apparatus which are capable of firmly fastening an optical member to be disposed on an optical apparatus without enlarging the diameter of the part of the optical apparatus where the optical member is disposed. <P>SOLUTION: The optical apparatus is provided with optical members 51, 55 for transmitting prescribed light and a member 31 having holes 36, 37 in which the optical members 51, 55 are arranged. The optical members 51, 55 are provided with a recessed part 58 outside an effective transmission region of the light, and the member 31 is engaged with the recessed part 58 of the optical members 51, 55 and has a protruded piece 57 for fastening the optical members 51, 55 to the member 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical member such as a lens or a cover glass in an optical system of an optical device, an optical device including the optical member, and an assembling method for incorporating the optical member into the optical device.

  Endoscopes used in the medical field insert a long insertion portion into a body cavity from outside the body, and perform medical acts such as observation, diagnosis or treatment in the body cavity, and administration of a drug solution into the body cavity. In recent endoscopes, the diameter of the insertion portion has been further reduced, such as the outer diameter of the insertion portion being 5 mm or less, due to the spread of the use site and purpose of use.

  The endoscope includes an optical lens for forming a subject image and an optical member such as a cover glass for protecting the optical system at a distal end portion of the insertion portion. However, as described above, as the diameter of the insertion portion is reduced, the options of means for fixing the optical member are limited, and fixing of the lens or cover glass exposed to the outside at the tip of the insertion portion is limited to that lens or A general method is to fill an optical member by filling an adhesive formed in a gap formed between the inner wall of the member of the holding portion that houses the cover glass.

  On the other hand, an endoscope is generally used repeatedly. For this reason, cleaning and disinfection are performed each time it is used, but chemicals, gases, water vapor, etc. used during cleaning and disinfection not only promote deterioration of the endoscope material, but also use adhesives. It is also possible to promote the deterioration of However, when the insertion portion is reduced in diameter, it is difficult to ensure adhesive strength. In addition, a means for mechanically fixing an optical member such as a lens or a cover glass with a screw can be used. However, since this means for mechanically fixing with a screw requires a space, it is necessary to insert an endoscope accordingly. The diameter of the part must be increased, and is unsuitable for mesoscopic endoscopes.

On the other hand, in Patent Document 1, a laser shot is applied to a metal pipe into which a combination lens is incorporated, and a melt-solidified protrusion is formed on the inner surface of the metal pipe. The protrusion is inserted from both the front and rear sides of the metal pipe. A front end surface and a rear end surface of the lens member to be abutted against the projecting element to position the combined lens. This is a positioning spacer which is interposed between two lens members inserted from both sides of the metal pipe and regulates the distance between the two front and rear lens members. However, this lens positioning technique regulates the distance between the two lens members and determines the front-rear position, and does not fix the lens alone to the metal pipe.
Japanese Patent Laid-Open No. 10-160992

  The present invention has been made in view of the above circumstances, and an optical member capable of more firmly fixing an optical member installed in an optical device without increasing the diameter of the portion of the optical device in which the optical member is installed. An object of the present invention is to provide an optical device and a method for assembling the optical device.

The invention according to claim 1 is an optical member capable of transmitting predetermined light, wherein a concave portion is provided outside an effective light transmission region.
The invention according to claim 2 is an optical apparatus including an optical member capable of transmitting predetermined light and a holding member having a hole portion in which the optical member is disposed, wherein the optical member is effective for light. An optical device comprising a recess outside the transmission region, the holding member engaging with the recess of the optical member, and having an engaging portion for fixing the optical member to the holding member. .
According to a third aspect of the present invention, the engaging portion includes a convex portion formed on the holding member by receiving an external force on the outer peripheral surface of the holding member, and the convex portion is associated with the concave portion of the optical member. The optical apparatus according to claim 2, wherein:
According to a fourth aspect of the present invention, the holding member includes a recess formed on the inner surface of the hole,
The optical device according to claim 2, wherein the engaging portion is an elastic body that is inserted between the concave portion of the optical member and the concave portion of the holding member.
The invention according to claim 5 is an endoscope assembling method, wherein the optical member having a recess outside the effective light transmission region is disposed inside the holding member having a hole, and the optical member. A processing energy is applied to the outer surface portion of the holding member corresponding to the position of the concave portion, and a convex portion is formed to protrude from the inner surface of the hole portion of the holding member, and the concave portion and the convex portion are engaged with each other. And an engaging step.

  According to the present invention, a concave portion is provided in the optical member installed in the optical device, and the optical member can be firmly fixed to the holding member of the optical device.

  An embodiment of the present invention will be described with reference to FIGS. 1A and 1B are longitudinal sectional views of a distal end portion in an insertion portion of an endoscope according to the present embodiment.

  The endoscope according to the present embodiment has an insertion portion 11, and this insertion portion 11 is connected to a hand operating portion (not shown). The insertion portion 11 is configured by sequentially connecting a flexible tube portion (not shown), a bending portion 12 and a distal end portion 13 in a line from the proximal end side. This endoscope is a so-called small-diameter endoscope in which the maximum outer diameter of the insertion portion 11, particularly the distal end portion 13 is about 5 mm, for example. The flexible tube portion of the insertion portion 11 is a flexible portion that flexes following by applying an external force of a certain level or more and has a resilience. The bending portion 12 is forcibly bent by operating a bending operation knob (not shown) provided in the hand operation portion, thereby changing the direction of the distal end portion 13.

  As shown in FIG. 1A, the bending portion 12 has a plurality of bending pieces 21 arranged in a line along the direction of the central axis L (longitudinal axis direction) of the insertion portion 11, and adjacent bending portions. The piece 21 is pivotally attached to the shaft member 22 so as to rotate in the vertical direction. The pivot portion 23 is provided on each of the left and right portions of the edge of the adjacent bending pieces 21 so as to protrude the ear pieces 24 toward the other bending piece 21, and the adjacent ear pieces 24 are overlapped with each other. The shaft member 22 passes through both the overlapping ear pieces 24 and is pivotally supported by riveting.

  As shown in FIG. 1 (A), wire guide rings 26 are respectively attached to the upper and lower positions of the bending piece 21, and the operation wires 27 are inserted separately over the upper and lower rows of the wire guide rings 26. Yes. The operation wire 27 inserted through the wire guide ring 26 is inserted into the wire guide ring 26 of the bending piece 21 located at the foremost end, and is fixed to the wire guide ring 26 by brazing means such as solder. The operation wire 27 is guided to the hand operation section through a guide sheath (not shown) disposed in the flexible tube section, and is connected to a bending operation mechanism (not shown) operated by a bending operation knob. When the bending operation knob is rotated, the upper and lower operation wires 27 are pushed and pulled by the bending operation mechanism, and the bending piece 21 is rotated in the direction in which the operation wire 27 is pulled, whereby the entire bending portion 12 is pulled in. Can be bent.

  As shown in FIGS. 1A and 1B, the outer periphery of the bending piece 21 of the bending portion 12 is covered with a so-called blade 28, and the outer side of the blade 28 is covered with an outer skin 29. The distal end side of the outer skin 29 extends to the distal end portion 13 so as to cover the outer periphery of the base portion of the distal end forming member 31 that forms the distal end portion 13. A cylindrical cover 32 is attached to the outer periphery of the tip portion of the tip forming member 31. The front end of the outer skin 29 is abutted against the rear end of the cover 32, and in this state, the outer periphery of the front end portion of the outer skin 29 is tightened with a thread 33, and the wound thread 33 is hardened with an adhesive 34.

  As shown in FIGS. 1A and 1B, the tip forming member 31 forming the main body member of the tip portion 13 is made of a single metal part such as SUS. The most advanced bending piece 21 of the bending portion 12 is attached to the rear end of the tip forming member 31. The tip forming member 31 is formed with a hole 35 for forming a channel port, a hole 36 for installing a member of an observation objective optical system, and a plurality of holes 37 for installing a member of an illumination optical system. .

  As shown in FIG. 1A, a channel tube 40 is connected to the inner end of a hole 35 forming a channel port via a connection base 41. The proximal portion of the channel tube 40 is guided to the proximal operating portion through the bending portion 12 and the flexible tube portion, and is connected to a channel cap (not shown) of the proximal operating portion. A channel penetrating from the channel base to the tip portion 13 is formed. This channel is used, for example, for insertion of a treatment instrument and also for air supply / water supply.

  Further, as shown in FIGS. 1A and 1B, the tip forming member 31 includes both the hole 36 for installing the above-described observation objective optical system member and the hole 37 for installing the illumination optical system member. Is formed in a substantially equal diameter linearly in parallel along the direction of the central axis L of the insertion portion 11.

  As shown in FIG. 1A, a cover glass 51, which is an optical member constituting the observation objective optical system, and a plurality of objective lenses 52a and 52b are disposed in the hole. The cover glass 51 is positioned in front of the cover glass 51 to protect members of the observation objective optical system disposed in the hole 36. The objective lens 52 a disposed in the hole 36 and positioned in front is joined to the back surface of the cover glass 51. In addition, the objective lens 52b located on the rear side is attached to the front end surface of the image guide fiber 53 while being bonded thereto. These optical members are all bonded and fixed with an adhesive at a predetermined position in the hole 36.

  Further, as shown in FIG. 1B, an illumination lens 55 that is an optical member of the illumination optical system is formed in the foremost position of the hole 37 in the hole 37 in which the illumination optical system member is installed. It is disposed at a seat 60 formed of a large diameter portion. Behind the illumination lens 55, a tip portion of the light guide fiber 56 is disposed. The illumination lens 55 and the tip portion of the light guide fiber 56 are bonded and fixed at predetermined positions in the hole 37.

  The image guide fiber 53 guides an image formed on the distal end surface by the objective lenses 52a and 52b to an eyepiece (not shown) provided in the hand operation section, and the image is guided to the eyepiece. It can be observed at. The light guide fiber 56 transmits illumination light and illuminates the field of the endoscope through the illumination lens 55.

  In the endoscope according to the present embodiment, the outer diameter of the distal end portion 13 is about 4.5 mm. In the distal end forming member 31 having such a small diameter, an optical system for capturing an image and an optical system for supplying illumination light are used. When the channel through which the treatment instrument is inserted is arranged, the cover glass 51 as an optical member that protects the observation objective optical system has a diameter of about 0.6 mm. For this reason, the structural space which can fix the cover glass 51 with a screw is not fully obtained. These circumstances also apply to the illumination lens 55 that is an optical member of the illumination optical system.

  As shown in FIG. 1A, a thin wall portion 36a corresponding to the installation position of the cover glass 51 as an optical member located at the foremost end is provided in the hole 36 for installing the observation objective optical system member. Form. Further, as shown in FIG. 1B, a thin wall portion 37a is also formed in the hole 37 where the illumination optical system member is installed at least corresponding to the installation position of the illumination lens 55 located at the foremost end. The thickness of these wall portions 36a and 37a depends on their strength, but is set so that a protrusion 57 as an engaging convex portion melted and solidified can be formed on the inner surface side by laser shot as will be described later. (See FIGS. (A) and (B)).

  On the other hand, as shown in FIGS. 2A and 2B, recesses 58 are provided in the peripheral walls of the cover glass 51 and the illumination lens 55, respectively. Then, as shown in FIGS. 3A and 3B, the protrusion 57, which is a convex portion as an engaging portion, is fitted into the concave portion 58, and the protrusion 57 is engaged, thereby covering the cover. The glass 51 and the illumination lens 55 are fixed to the tip forming member 31. The shape and size of the recess 58 are usually 0.1 mm wide and 0.05 mm deep so as to be positioned outside the effective light transmission region so as not to adversely affect the optical system. Is desirable. The shape of the concave portion 58 may be a hollow shape such as a drill holding, or a shape formed by grooving the entire circumference of the lens periphery with a lathe. Of course, when a molded lens is arranged, it may be manufactured in such a way that the concave portion 58 appears in advance when the lens is molded.

  As described above, a seat 59 for arranging the cover glass 51 is provided in the hole 36 in which the member of the objective optical system for observation is formed in the tip forming member 31. The portion to which the laser is applied from the outer surface on the side of the seat 59 is formed as the wall portion 36a, and the wall portion 36a has a shape in which the thickness is not uneven. A seat 60 for arranging the illumination lens 55 is also provided in the hole 37 in which the illumination optical system member is installed. The portion to which the laser is applied from the outer surface of the side of the seat 60 is formed as the wall portion 37a, and the wall portion 37a has a shape in which the thickness is not uneven.

  The thickness of the wall portions 36a and 37a is about 0.1 mm to 0.3 mm in consideration of making the diameter of the tip forming member 31 as small as possible and the thickness that can be stably manufactured for machining. In addition, it is more preferable that the shot portion has a constant thickness so that the laser shot condition does not need to be changed according to the shot portion.

  Next, a method of fixing the cover glass 51 of the observation objective optical system as described above and a method of fixing the illumination lens 55 of the illumination optical system will be described. As shown in FIG. 5, since the fixing methods are the same, the fixing of the cover glass 51 of the observation objective optical system is mainly described, and the fixing of the illumination lens 55 of the illumination optical system is not touched. is there.

  As described above, the tip forming member 31 having the hole 36 for installing the observation objective optical system member and the hole 37 for installing the illumination optical system member is formed (step S1), and FIG. As shown in (B), a recess 58 is formed in the peripheral surfaces of the cover glass 51 and the illumination lens 55 to be loaded in the holes 36 and 37 (step S2).

  Next, a member of the objective optical system for observation is installed in the hole 36 of the tip forming member 31, and the cover glass 51 is inserted from the tip side of the hole 36. The cover glass 51 is inserted into a seat 59 corresponding to the wall portion 36a with a jig. Position and temporarily fix (step S3).

  Next, as shown in FIG. 4, the tip forming member 31 is set on a laser processing machine to determine a shot location (step S4). Then, laser shot is performed from the outside of the portion of the wall portion 36 a corresponding to the concave portion 58 of the cover glass 51 in the tip forming member 31. At this time, the laser shot is performed as shown in FIG. 3A by controlling so that the thick portion of the wall portion 36a of the tip forming member 31 does not penetrate and the laser shot portion is in an instantaneous melted state. As described above, the melt-solidified protrusion 57 is formed on the inner surface of the wall 36a (step S5).

  Thus, the protrusion 57 is formed in a shape that enters the recess 58 of the cover glass 51 and is combined so as to engage with the recess 58. That is, the protrusion 57 is engaged with the recess 58 as a mechanical hook, and the cover glass 51 is fixed to the tip forming member 31 as shown in FIG. Further, if laser shots are performed at several locations, the plurality of protrusions 57 enter the recess 58 of the cover glass 51, and the fixing strength of the cover glass 51 can be further improved.

  After the laser shot, the adhesive is poured into the gap formed between the tip forming member 31 and the cover glass 51 (lens 55), the gap is filled, the adhesive is cured, and the tip forming member 31 and the cover glass are filled. 51 (lens 55) is bonded and fixed to form a watertight structure in which the gap is sealed (step 6). Finally, the finish is confirmed and the watertight performance is checked (step 7).

  In recent years, YAG laser technology that can radiate a minute spot with high accuracy and has excellent output control is known. When this laser is used, it is possible to control the laser shot so that the material does not penetrate from the outside such as pipe material. At that time, the laser shot part is instantaneously melted and a solidified protrusion is created on the inner surface Laser shot control is also possible. Further, the size of the protrusion 57 can be formed with a high accuracy of a width of 0.2 ± 0.02 mm and a height of 0.05 ± 0.01 mm if it is a stainless steel pipe having a thickness of 0.05 mm. is there.

  Since it is desirable that the exterior part of the endoscope has a watertight structure, in this embodiment, in order to prevent water leakage, the protrusion 57 is formed in advance so that the laser shot portion does not require post-processing so as not to penetrate. However, if a separate process is performed for the watertight structure, the laser may be penetrated to make a large burr shape in the penetrating portion, which may be regarded as the protrusion 57, and a method for configuring the catching structure may be selected.

  Next, another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view showing a structure in which the cover glass 51 of the observation objective optical system is fixed in the hole 36 formed in the distal end forming member 31 of the distal end portion 13 of the endoscope.

  Similarly to the above, the cover glass 51 has a V-groove-shaped recess 58 that circulates around the outer peripheral surface. A groove-like recess 61 is formed on the inner surface of the hole 36 at a position corresponding to the recess 58 when the cover glass 51 is installed in the hole 36 of the tip forming member 31. The notch shape of the groove of the recess 61 may be a V-shaped cross section shown in FIG. 6, a U-shaped cross section, or another shape. Further, the notch shape of the groove of the concave portion 58 of the cover glass 51 may be U-shaped in cross section or may be in another shape.

  A C-ring-shaped member 62 having an elastic characteristic as an engaging convex portion is fitted in and attached to the groove-shaped concave portion 61 of the hole 36. The outer diameter of the C-ring-shaped member 62 is larger than the diameter of the hole 36 formed in the tip forming member 31 as the lens frame and smaller than the diameter of the groove bottom of the recess 61. Therefore, a gap is formed between the groove bottom of the recess 61 and the C-ring-shaped member 62. The recess 61 of the hole 36 in which the C-ring-shaped member 62 is mounted is formed with a depth that allows the C-ring-shaped member 62 to elastically expand and retract from the outer periphery of the cover glass 51.

  Further, the inner peripheral portion of the C-ring-shaped member 62 protrudes inward from the inner surface of the hole 36 and is fitted into the recess 58 of the cover glass 51 as shown in FIG. The C-ring shaped member 62 is mechanically hooked and locked in the recess 58 to reinforce the fixing of the cover glass 51 to the tip forming member 31. When the cover glass 51 is inserted into the hole 36 of the tip forming member 31, the C ring-shaped member 62 is elastically deformed and spreads, retracts into the recess 61, and allows the cover glass 51 to be inserted. When the concave portion 58 of the cover glass 51 reaches the position of the C ring-shaped member 62, as shown in FIG. 6, the deformation of the C ring-shaped member 62 is restored and enters the concave portion 58 of the cover glass 51, It is crimped and mechanically hooked and engaged with the cover glass 51. At this time, the outer peripheral portion of the C-ring-shaped member 62 enters the concave portion 61 of the hole 36 and is mechanically caught by the tip forming member 31 to fix the cover glass 51 to the tip forming member 31.

  According to this embodiment, the cover glass 51 can be engaged with the tip forming member 31 without forming the protrusion 57 by laser shot.

  In this embodiment, the C-ring-shaped member 62 is used as the engaging member. However, a shape variable ring component that fits between the grooves 57 and 61 using a material such as a shape memory alloy or rubber may be used. .

  Still another embodiment of the present invention will be described with reference to FIGS. FIG. 7A is a longitudinal sectional view showing a structure for fixing the cover glass 51 of the observation objective optical system in the hole 36 formed in the distal end forming member 31 of the distal end portion 13 of the endoscope. FIG. 7B is a cross-sectional view showing the structure.

  The cover glass 51 is formed with a groove-like recess 58 that circulates around the outer peripheral surface as in the above embodiment. A groove-like recess 66 is formed on the inner surface of the hole 36 at a position corresponding to the recess 58. Then, as shown in FIGS. 7A and 7B, a ball-like shape having elastic characteristics as an engaging convex portion between the concave portion 58 of the cover glass 51 and the concave portion 66 side concave portion 66 of the tip forming member 31. The number of members 65 is one or more, preferably three or more. The ball-shaped member 65 having this elastic characteristic is locked between the concave portion 58 of the cover glass 51 and the concave portion 66 on the hole 36 side of the tip forming member 31 and mechanically hooks and engages to form the tip. The fixing of the cover glass 51 to the member 31 is reinforced.

  Further, since the ball-shaped member 65 has an elastic characteristic, when the cover glass 51 is attached to the hole 36 of the tip forming member 31, the ball-shaped member 65 is loaded in the concave portion 58 of the cover glass 51 to cover the cover glass 51. When inserted into the hole 36 of the tip forming member 31 together with the glass 51, the ball-shaped member 65 is elastically deformed and falls into the hole 36 side recess 66 of the tip forming member 31. Thus, since the cover glass 51 is mechanically engaged with the tip forming member 31 using the engaging ball-shaped member 65, the cover glass 51 can be firmly fixed to the tip forming member 31.

  Even if the ball-shaped member 65 in this embodiment is made hard, it can be used if the portion as the lens frame on the side of the hole 36 is made of at least an elastic metal material or configuration.

  In addition, when fixing using the said C ring-shaped member 62 or the ball-shaped member 65 as an engaging convex part, you may abbreviate | omit the recessed part 61 or the recessed part 66 by the side of the front end formation member 31. FIG.

  As described above, in this embodiment, the main fixing of the optical member and securing of water tightness are performed by an adhesive, and as an auxiliary fixing means, an engaging portion that is hooked in combination with the concave portion of the lens or the cover glass is formed, By combining with the fixing of the adhesive, an optical member such as a lens or a cover glass is fixed more firmly.

  In particular, when the engaging protrusion is formed by melting by laser shot, the laser shot processing has the advantage that it can be processed even when the thickness of the processed part is thin compared to fixing with a screw structure. Rather, the laser shot processing has a fixed structure in which the processed portion is preferably thinner. In addition, it is possible to easily construct the fixing structure of the optical member without requiring a large space and without increasing the diameter of the peripheral portion.

  The present invention can be applied not only to medical endoscopes, but also to industrial endoscopes, and can also be applied to devices using optical members other than endoscopes.

<Appendix> According to the above description, the following items are obtained.
1. A member that forms an internal space; an optical member that is disposed in the internal space and that can transmit light from one end to the other end; a recess that is provided on the outer peripheral surface of the optical member; and an inner peripheral surface of the member And a convex portion that engages with the concave portion and fixes the optical member to the member.
2. A tubular member that forms an internal space; an optical member that is disposed in the internal space and is capable of transmitting light from one end to the other end; a recess provided on the outer peripheral surface of the optical member; and an inner peripheral surface of the tubular member And a convex portion that engages with the concave portion and fixes the optical member to the tubular member.
3. A method for fixing an optical member of an endoscope, the disposing step of arranging an optical member having a concave portion on the outer peripheral surface inside the holding member, and the outer periphery of the holding member corresponding to the concave portion on the outer peripheral surface of the optical member A launching unit positioning step for positioning the laser emitting unit so that the laser can be irradiated toward the surface, and an outer periphery of the member positioned corresponding to the concave portion of the outer peripheral surface of the optical member disposed from the emitting unit A method of manufacturing an endoscope, comprising: irradiating a surface with a laser; and forming a convex portion engaging with the concave portion on an inner peripheral surface of the holding member.
4). A method for fixing an optical member constituting an endoscope, wherein an optical member having a concave portion on a peripheral surface is disposed in a tubular member, and a laser is disposed at a position corresponding to the concave portion on the outer peripheral surface of the tubular member. The laser beam is irradiated to a position corresponding to the concave portion of the outer circumferential surface of the tubular member from the projecting portion, and the inner circumferential surface of the tubular member is irradiated. And a laser irradiation step of forming a convex portion that engages with the concave portion.

(A) (B) is a longitudinal cross-sectional view of the front-end | tip part in the insertion part of the endoscope which concerns on one Embodiment of this invention. (A) is a longitudinal cross-sectional view of the objective optical system cover glass of the endoscope, and (B) is a longitudinal cross-sectional view of the illumination lens of the endoscope. (A) is a longitudinal cross-sectional view of the attachment part of the cover glass for objective optical systems of the endoscope, and (B) is a longitudinal cross-sectional view of the attachment part of the illumination lens of the endoscope. Explanatory drawing in the case of performing a laser shot process to the attachment part of the illumination lens of the said endoscope. Explanatory drawing of the attachment and fixing method of the optical member of the said endoscope. The longitudinal cross-sectional view of the attaching part of the cover glass for objective optical systems of other embodiment of this invention. (A) is a longitudinal cross-sectional view of the attachment part of the cover glass for objective optical systems of further another embodiment of this invention, (B) is a cross-sectional view of the attachment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Insertion part, 12 ... Bending part, 13 ... Tip part, 31 ... Tip formation member, 36 ... Hole,
36a ... wall portion, 37 ... hole, 37a ... wall portion, 51 ... cover glass,
53 ... Image guide fiber, 55 ... Illuminating lens, 56 ... Light guide fiber 57 ... Projector, 58 ... Recess.

Claims (5)

  An optical member capable of transmitting predetermined light, wherein a concave portion is provided outside an effective light transmission region. An optical member capable of transmitting predetermined light;
An optical device comprising a holding member having a hole portion for arranging the optical member,
The optical member includes a recess outside the effective light transmission region,
The optical device, wherein the holding member is engaged with a concave portion of the optical member, and has an engaging portion for fixing the optical member to the holding member.   The engaging portion includes a convex portion formed on the holding member in response to an external force applied to the outer peripheral surface of the holding member, and the convex portion engages with a concave portion of the optical member. Item 3. The optical device according to Item 2. The holding member includes a recess formed on the inner surface of the hole,
The optical apparatus according to claim 2, wherein the engaging portion is an elastic body that is inserted between the concave portion of the optical member and the concave portion of the holding member. An assembly method for an endoscope,
An arrangement step of arranging an optical member having a recess outside the effective transmission region of light inside a holding member having a hole;
A processing energy is applied to the outer surface portion of the holding member corresponding to the position of the concave portion of the optical member, and a convex portion is formed to protrude from the inner surface of the hole portion of the holding member, and the concave portion and the convex portion are formed. An engaging step to engage;
It is characterized by having.

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