JP2009245975A - Optical cap component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the generation of improper stress and deformation in a lid part because of both tightening force and depressive force simultaneously acting on the outer peripheral surface of a cylindrical part in the cap body of an optical cap component during welding by a resistor welding electrode, and to prevent the generation of the break of low-melting glass fixing a light transmission member to the lid part and the airtight destruction inside the optical cap component accompanying it. <P>SOLUTION: The optical cap component 1 includes: a covered cylindrical cap body 2 for which a lid part 3 is connected to the distal end side end part 5x of a cylindrical part 5 and a flange part 5f where the resistor welding electrode 8 is to be abutted from the distal end side is connected to the proximal end side end part 5y of the cylindrical part 5; and the light transmission member (spherical lens) 4 fixed to the lid part 3 of the cap body 2 by the low-melting glass 6 and sealing a through-hole 3a formed on the lid part 3. The outer diameter of the cylindrical part 5 is formed such that all the area 5b having the axial direction prescribed width on the distal end side has the diameter smaller than that of the area 5a on the proximal end side including the proximal end side end part 5y. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical cap component. More specifically, a covered cylindrical cap body includes a lid portion to which a light transmitting member is fixed by low melting glass, a flange portion to which a resistance welding electrode abuts, The present invention relates to an optical cap component including a cylindrical portion to which a lid portion and a flange portion are connected.

  As is well known, an optical cap component covers an optical element such as a light-emitting element or a light-receiving element used in optical communication or an optical sensor. The input / output can be appropriately performed. Therefore, in this type of optical cap component, it is extremely important to keep the inside of the cap member in an airtight state.

  Specifically, this type of optical cap component is secured to the lid portion of the cap main body with a lid portion connected to the end portion on the tip side of the cylindrical portion, and to the lid portion of the cap body with low melting point glass. And a light transmissive member (for example, a spherical lens) that seals the through hole formed in the lid. In general, the optical cap component is resistance-welded to a stem to which the optical element as described above is attached.

  Therefore, in this type of optical cap component, a flange portion on which the resistance welding electrode abuts from the distal end side is formed at the proximal end portion of the cylindrical portion of the cap body (for example, the following patent document) 1-3). Then, with the bottom surface of the flange portion being in contact with the top surface of the stem, the resistance welding electrode is brought into contact with the top surface of the flange portion to energize, thereby causing Joule heat to act between the flange portion and the stem. Both are welded together.

  As the resistance welding electrode used for this welding, as disclosed in Patent Document 4 below, the cylindrical portion is divided into a plurality of circumferential directions following the outer periphery of the cap body, and the divided individual electrodes are arranged on the inner side. By tightening to the (center side in the radial direction), those equipped with a collet chuck mechanism configured to grip the cylindrical portion of the cap body from the outer peripheral side have come to be frequently used.

In addition, in Patent Document 2 below, when a force is applied to the cylindrical portion of the cap main body so as to deviate the perpendicularity to the lid portion, the lid portion is deformed into a central portion (light transmissive member mounting portion). In order to suppress the spread, the connecting portion between the tubular portion and the lid portion is made thin (see FIGS. 1 to 5 of the same document), and a concave portion is formed in the vicinity of the end portion on the distal end side of the tubular portion The thinning (see FIG. 6 of the same document) is disclosed.
JP 2006-106504 A JP 2006-126272 A JP 2007-83247 A Japanese Patent No. 3734705

  By the way, since the cap body of this type of optical cap component is often manufactured by press molding from the viewpoint of reducing the processing cost, any wall of the cylindrical portion, the lid portion, and the flange portion is formed. The actual situation is that the thickness is as thin as 0.1 to 0.3 mm. And the cylindrical part of the cap main body disclosed by said patent documents 1-3 has the same outer diameter of the whole area | region from a base end side edge part to a front end side edge part, and is the resistance welding electrode. In accordance with this, the inner peripheral surface has the same inner diameter in the corresponding region.

  Therefore, in particular, when the outer peripheral surface of the cylindrical portion is gripped in order to accurately position the cap body by the resistance welding electrode provided with the above-described collet chuck mechanism, the proximal side end to the distal end The entire outer peripheral surface area up to the portion is firmly tightened. If resistance welding is performed in such a state, the forging pressure by which the resistance welding electrode pushes down the cap body during the welding acts not only on the flange portion, but also in a cylindrical shape that is tightened by the resistance welding electrode. The entire outer peripheral surface area of the portion also acts as a pressing force together with the tightening force. At that time, since an unreasonable stress is generated in the entire area of the cylindrical portion in the cap body, the same applies to the lid portion connected to the end portion on the distal end side of the cylindrical portion in which such stress is generated. Since an unreasonable stress is generated and the lid portion is deformed, a crack occurs in the low-melting glass to which the light transmitting member is fixed, and there is a problem that the airtightness inside the optical cap component is destroyed. .

  In this case, the above-mentioned Patent Document 2 (FIGS. 1 to 5 of the same document) describes that the connecting portion between the cylindrical portion of the cap body and the lid portion is made thin. Since the outer diameter is the same from the proximal end to the distal end, the same problem as described above occurs. Furthermore, in this patent document 2 (see FIG. 6 of the same document), it is described that a concave portion is formed on the outer peripheral surface portion in the vicinity of the tip side end portion of the cylindrical portion of the cap body to make it thin. The outer diameter of the portion where the thin-walled portion is formed is small, but this small-diameter portion is an extremely narrow region, and the proximal-side region of the thin-walled portion-forming portion is around the distal end of the cylindrical portion. There is a part with the same outer diameter. Therefore, the tightening force by the resistance welding electrode not only acts on the region existing on the base end side of the thin portion in the tubular portion, but also acts on the periphery of the end portion on the distal end side of the tubular portion. Sometimes, a pressing force and a pressing force simultaneously act on almost the entire area of the outer peripheral surface of the cylindrical part, and due to this, an undue stress is generated in both the cylindrical part and the lid part, Even in this case, the same problem as described above may occur.

  In view of the above circumstances, the present invention is based on the fact that both the tightening force and the pressing force simultaneously act on the outer peripheral surface of the cylindrical portion of the cap body of the optical cap component during welding with the resistance welding electrode. This avoids the occurrence of undue stress and deformation in the part, thereby causing the cracking of the low melting point glass fixing the light transmitting member to the lid part and the accompanying hermetic breakdown of the optical cap part. Preventing it is a technical issue.

  In order to solve the above technical problem, the present invention is such that a lid portion is connected to a distal end side end portion of a cylindrical portion, and a resistance welding electrode is connected to the proximal end portion of the cylindrical portion from the distal end side. A covered cylindrical cap main body to which the abutting flange portion is connected, and a light transmitting member that is fixed to the lid portion of the cap main body with low melting point glass and seals the through hole formed in the lid portion. In the optical cap component, the outer diameter of the cylindrical portion is characterized in that all of the region having a predetermined axial width on the distal end side is smaller in diameter than the region on the proximal end side including the proximal end portion. It is done. The above “predetermined width in the axial direction” means a predetermined width in the direction along the central axis of the cap body (hereinafter the same).

  Here, the “cylindrical part” does not include a connecting part between the cylindrical part and the lid part, and does not include a connecting part between the cylindrical part and the flange part. More specifically, for example, when the inner surfaces of the cylindrical portion 5 and the lid portion 3 are bent at right angles and connected as shown in FIGS. Regardless of whether the form is a right angle or curved, it is partitioned by a straight line x extending to the tip side along the inner surface of the cylindrical portion 5 and a straight line y extending to the outer peripheral side along the inner surface of the lid portion 3. The partition area 5c (area with cross-hatching in the figure) serves as a connecting portion, and the cylindrical portion 5 does not include these connecting portions 5c. Further, for example, when the inner surfaces of the cylindrical portion 5 and the lid portion 3 are connected via the curved portion R as shown in FIGS. Regardless of whether it is right-angled or curved, a partition region 5c (region with cross-hatching in the figure) having the start end R1 and the end R2 of the curved portion R as a boundary serves as a connecting portion. 5 does not include these connecting portions 5c. On the other hand, for example, as shown in FIGS. 2A to 2C, when the outer surfaces of the cylindrical portion 5 and the flange portion 5f are bent at right angles and connected, the connection form of the inner surfaces is as follows. Regardless of whether it is a right angle or curved, it is partitioned by a straight line x1 extending toward the base end along the outer surface of the cylindrical portion 5 and a straight line y1 extending toward the inner peripheral side along the outer surface of the flange portion 5f. The partition region 5d (region with cross-hatching in the figure) serves as a connecting portion, and the cylindrical portion 5 does not include these connecting portions 5d. Further, for example, when the outer surfaces of the cylindrical portion 5 and the flange portion 5f are connected via the curved portion R as shown in FIGS. Regardless of whether it is a right angle or curved, a partition region 5d (region with cross-hatching in the figure) having a boundary between the start end R1 and the end R2 of the curved portion R becomes a connecting portion, and the cylindrical portion 5 does not include these connecting portions 5d.

  Further, the above-mentioned “region on the base end side including the base end portion” means a region regardless of whether or not it has an axial width from the base end portion toward the tip end side of the cylindrical portion. On the other hand, the “region having a predetermined axial width on the tip side” means a region having a width in the axial direction, regardless of whether it is wide or narrow.

  According to such a configuration, when welding with the resistance welding electrode, the entire outer peripheral surface area of the cylindrical portion of the cap body of the optical cap component is firmly tightened to the radial center by the inner peripheral surface of the resistance welding electrode. However, while only the proximal end region where the outer diameter of the cylindrical portion is large is firmly tightened, the distal end region where the outer diameter is generally smaller than that region Since it can be in a non-contact state or a light contact state, it is not at least firmly tightened. Therefore, even when an undue stress is generated due to simultaneous application of the tightening force and the pressing force to the proximal end region of the tubular portion during actual welding, the distal end region of the tubular portion, particularly the distal end Such a stress is not generated in the vicinity of the side end portion, thereby preventing a situation in which an unreasonable stress is generated up to the lid portion. As a result, it is possible to prevent the lid portion from being unduely deformed, the occurrence of cracks in the low-melting-point glass fixing the light transmitting member to the lid portion, and the accompanying hermetic breakdown of the optical cap component. Can be prevented in advance. The maximum outer diameter of the connecting portion 5c between the cylindrical portion 5 and the lid portion 3 is preferably not larger than the outer diameter of the end portion on the distal end side of the cylindrical portion 5 as shown in the figure. Even if the maximum outer diameter of the connecting portion 5c is larger than the outer diameter of the region on the distal end side of the tubular portion 5, the outer diameter of the region on the proximal end side including the proximal end portion of the tubular portion 5 is larger. If the diameter is small, the same effect can be enjoyed.

  In this case, it is preferable that the tubular portion has a uniform thickness in the entire region.

  In this way, while ensuring good quality of the cap body, it is possible to improve the strength and consequently the durability, and also facilitate the production.

  Moreover, it is preferable that the outer peripheral surface of the said cylindrical part does not have the site | part by which a front end side becomes larger diameter than a base end side in the process which transfers to a front end side from a base end side.

  In this way, there is no partial recess or the like on the outer peripheral surface of the cylindrical part of the cap body, and the problem of local stress concentration occurring in the cylindrical part during welding can be avoided accurately. Is possible.

  Further, the outer peripheral surface of the cylindrical portion gradually reduces in diameter as the region of 50 to 80% from the distal end side toward the proximal end side with respect to the entire region shifts from the proximal end side to the distal end side, A region on the base end side that is connected to the region smoothly or bent may have the same diameter from the end on the base end side to the tip end side.

  In this way, the proximal end region having the same outer diameter from the proximal end portion to the distal end side of the cylindrical portion is appropriately tightened by the inner peripheral surface of the resistance welding electrode. Then, the welding operation is performed after the cap body is accurately positioned or aligned. In addition, since 50 to 80% of the region from the distal end to the proximal end with respect to the entire region of the tubular portion is gradually reduced in diameter as it moves from the proximal end to the distal end, In this case, a direct clamping force is not applied from the resistance welding electrode, and a situation in which an undue stress is generated from the distal end side of the cylindrical portion to the lid portion is more reliably avoided. That is, if this region is less than 50%, the area where the direct welding force by the resistance welding electrode does not act tends to be insufficient on the tip side of the cylindrical portion, and unreasonable stress generation in the lid portion is mitigated. If it exceeds 80%, there is a risk that it may be disadvantageous for accurate positioning by tightening the resistance welding electrode on the base end side of the cylindrical portion. Therefore, it is preferable that the region where the diameter is gradually reduced toward the distal end side is within the above numerical range. Moreover, since this area | region is gradually diameter-reduced to the front end side, the advantage that workability, such as press molding at the time of manufacture of a cap main body, becomes favorable can also be enjoyed.

  In this case, the outer peripheral surface of the cylindrical portion is connected to the minimum diameter of the region of 50 to 80% from the distal end portion toward the proximal end side with respect to the entire region, and smoothly or bent to the region. It is preferable that the difference from the diameter of the proximal end region is set to be 10 μm or more.

  In this way, in the region of 50 to 80%, the degree of firm tightening in the contact state by the inner peripheral surface of the resistance welding electrode is surely reduced, and unreasonable stress generation on the lid is possible. Can be reduced. That is, when the difference is less than 10 μm, there is a possibility that a tightening force exceeding the allowable value may act on the region of 50 to 80% from the inner peripheral surface of the resistance welding electrode with the deformation of the cylindrical portion. However, if the difference is 10 μm or more, such a problem does not occur.

  In addition, the outer peripheral surface of the cylindrical portion has a 50% to 80% region from the distal end side to the proximal end side with respect to the entire region, and has the same diameter from the proximal end side to the distal end side. A region on the base end side connected through the diameter-expanded step portion may have the same diameter from the base end portion to the distal end side.

  Even in such a case, from the viewpoint of suppressing the generation of inappropriate stress in the lid portion, it is possible to obtain substantially the same function and effect as in the case of the above-mentioned gradually reduced diameter.

  Also in this case, the outer peripheral surface of the cylindrical portion has a diameter of 50 to 80% from the distal end to the proximal end with respect to the entire region, and an enlarged stepped portion in the region. It is preferable that the difference from the diameter of the region on the base end side that is continuous is set to be 10 μm or more.

  Even in this case, the degree to which the above 50 to 80% region is firmly tightened in the contact state by the inner peripheral surface of the resistance welding electrode is surely reduced, and in the case of substantially the above-mentioned gradually reduced diameter. The same effect can be obtained.

  The cap body may be a press-molded product or a cut product.

  And since the resistance welding electrode is provided with a collet chuck mechanism, the above-mentioned effects can be obtained more reliably and remarkably.

  As described above, according to the optical cap part of the present invention, the entire outer peripheral surface area of the cylindrical portion of the cap body is welded by the inner peripheral surface of the resistance welding electrode as in the prior art when welding with the resistance welding electrode. Tight tightening is avoided. That is, only the proximal end region where the outer diameter of the cylindrical portion is large is firmly tightened, and the distal end region whose outer diameter is generally smaller than that region is in a non-contact state or a light contact state. Since it is obtained, it is not at least firmly tightened. Therefore, even when an undue stress is generated due to simultaneous application of a tightening force and a pushing-down force to a region on the proximal end side of the tubular portion during actual welding, the region on the distal end side of the tubular portion, particularly the distal end Such a stress does not occur in the vicinity of the side end portion, thereby preventing a situation in which an unreasonable stress is generated even in the lid portion. As a result, the lid portion is prevented from being deformed inappropriately, and cracking of the low-melting point glass fixing the light transmitting member to the lid portion and accompanying airtight destruction of the optical cap component are obviated. To be prevented.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, an optical cap component including a spherical lens as a light transmitting member is illustrated.

  FIG. 3 is a longitudinal front view illustrating the optical cap component 1 according to the first embodiment of the invention. As shown in FIG. 1, the optical cap component 1 includes a covered cylindrical cap body 2 and a spherical lens 4 attached to the lid portion 3 of the cap body 2. The cap body 2 is made of metal, and in this embodiment, is formed by press working.

  More specifically, the cap main body 2 is connected to the distal end side end portion 5x of the cylindrical cylindrical portion 5 via the first connecting portion 5c and the base end of the cylindrical portion 5 A flange portion 5f is coupled to the side end portion 5y via a second coupling portion 5d. A through hole 3 a is formed at the center of the lid 3 of the cap body 2, and the spherical lens 4 is fixed by a low melting point glass 6 so as to seal the through hole 3 a. In this case, the inner surface of the first connecting portion 5c is curved and the outer surface of the second connecting portion 5d is curved. The relationship between the connecting portions 5c, 5d and the cylindrical portion 5 is as described above. is there.

  The cylindrical portion 5 of the cap body 2 includes a base end side region including the base end side end portion 5y, that is, a region having a predetermined axial width from the base end side end portion 5y toward the front end side (hereinafter referred to as a base end side region). ) 5a and a region having a predetermined axial width (hereinafter referred to as a distal end side region) 5b that extends smoothly and bends to the distal end side of the proximal end region 5a and reaches the distal end portion 5x. The outer diameter of the tubular portion 5 is such that all of the distal end side region 5b is smaller than the proximal end region 5a, and the thickness of the tubular portion 5 is the same for all the regions 5a and 5b. Is uniform.

  Moreover, the outer peripheral surface in the entire region of the cylindrical portion 5 does not have a portion where the distal end side has a larger diameter than the proximal end side in the process of transition from the proximal end side to the distal end side. That is, the outer peripheral surface of the cylindrical portion 5 is not formed with a stepped portion or the like that expands in the middle of the transition from the proximal end side to the distal end side, and the diameter is increased after being reduced in diameter once. A concave annular groove or the like is not formed.

  Further, the outer peripheral surface of the cylindrical portion 5 is such that when the axial length of the entire region is L and the axial length of the distal end side region 5b is La, La is 50 to 80% of L (this In the embodiment, it is formed to be approximately 50%). The outer peripheral surface of the distal end side region 5b is gradually reduced in diameter (preferably gradually reduced at a constant ratio) as it moves from the proximal end side to the distal end side, whereas the proximal end side region The outer peripheral surface of 5a has the same diameter (including substantially the same diameter) from the proximal end side to the distal end side. The difference between the minimum diameter Db of the distal end side region 5b of the cylindrical portion 5 and the outer diameter Da of the proximal end side region 5a is 10 μm or more, and both the regions 5a and 5b are formed coaxially. .

  The optical cap component 1 configured as described above is welded to the stem by the resistance welding electrode as follows.

  As shown in FIG. 4, when the optical cap component 1 is welded to the stem 7, a collet chuck type resistance welding electrode 8 in which the cylindrical portion is divided into a plurality of parts (for example, three parts) in the circumferential direction is used (see FIG. 4). Detailed illustration is omitted). The inner diameter of the inner peripheral surface of the cylindrical portion of the resistance welding electrode 8 is at least the same length (including substantially the same diameter) as the length corresponding to the axial length of the cap body 5. . Then, the resistance welding electrode 8 in which the cylindrical portion is divided into a plurality of parts is clamped to the radial center side to be reduced in diameter, and the inner peripheral surface of the resistance welding electrode 8 is used to form a base in the cylindrical portion 5 of the cap body 2. After gripping the outer peripheral surface of the end side region 5a, it is conveyed to the welding stage 9. In this case, a holding recess 9a is formed in the welding stage 9, and the stem 7 on which the optical element 10 is mounted is previously accommodated in the holding recess 9a.

  In such a state, the optical axes of the spherical lens 4 of the optical cap component 1 and the optical element 10 are aligned while finely adjusting the position in the horizontal plane of the optical cap component 1 by the resistance welding electrode 8, and thus The projection 5p formed on the back surface of the flange portion 5f of the cap body 2 is brought into contact with the upper surface of the stem 7 while maintaining a proper positional relationship. Thereafter, an electric current is passed between the flange portion 5f and the stem 7 by the resistance welding electrode 8, and the projection 5p is melted by Joule heat generated at this time, and the optical cap component 1 and the stem 7 are welded.

  In the process in which such an operation is performed, the resistance welding electrode 8 tightens the tubular portion 5 of the cap body 2, but the tightening force mainly acts on the proximal side region 5 a of the tubular portion 5. Thus, since almost no tightening force is applied to the distal end side region 5b, the distal end side region 5b is not affected by the forging pressure applied at the time of resistance welding, and generation of undue stress is suppressed. Therefore, it is possible to reliably prevent the undue stress from being generated in the lid portion 3 connected to the tip side end portion of the tip side region 5b via the first connecting portion 5c. Inappropriate deformation and cracking of the low-melting glass 6 due to this are prevented in advance, thereby preventing hermetic destruction of the inside of the optical cap component 1.

  FIG. 5 illustrates an optical cap component 1 according to the second embodiment of the present invention. The optical cap component 1 according to the second embodiment is different from the optical cap component 1 according to the first embodiment described above in that the outer diameter of the distal end side region 5b in the cylindrical portion 5 of the cap body 2 is different. These are the same diameter from the distal end side to the proximal end side, and the point where the continuous portion from the distal end side region 5b to the proximal end side region 5a is the enlarged diameter step portion 5z. Since the other configuration is the same as that of the first embodiment described above, the components common to both embodiments are denoted by the same reference numerals, and the description thereof is omitted. Since the optical cap component 1 according to the second embodiment is also welded to the stem 7 using the resistance welding electrode 8 in the same manner as in the first embodiment, substantially the same operation is performed. An effect is obtained.

  In addition, although the above embodiment made the cylindrical part 5 of the cap main body 2 uniform thickness over the whole area | region, after changing the thickness of the cylindrical part 5, You may make it small diameter of the front end side area | region 5b rather than an outer diameter.

  Moreover, although the above embodiment divided the cylindrical part 5 of the cap main body 2 into the base end side area | region 5a and the front end side area | region 5b which have an axial direction width | variety, for example, the base which does not have an axial direction width | variety substantially. Only the end side end portion 5y may be the base end side region 5a, and the diameter may be gradually reduced from the base end side end portion 5y of the cylindrical portion 5 to the tip end side end portion 5x.

  Furthermore, although the spherical lens 4 was illustrated as a light transmissive member in the above embodiment, for example, other lenses such as a rod lens, or a transparent plate such as a glass plate having no lens function may be used.

FIG. 1A to FIG. 1F are schematic views of main parts for explaining a connecting portion between a cylindrical portion and a lid portion of a cap body in an optical cap component according to the present invention. 2A to 2F are main part schematic views for explaining a connecting portion between the cylindrical portion and the flange portion of the cap body in the optical cap component according to the present invention. It is a vertical front view which shows the optical cap component which concerns on 1st embodiment of this invention. It is a longitudinal front view which shows the state at the time of welding the optical cap component which concerns on 1st embodiment of this invention using the electrode for resistance welding. It is a vertical front view which shows the optical cap components which concern on 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical cap component 2 Cap main body 3 Cover part 3a Through-hole 4 Light transmissive member (spherical lens)
5 cylindrical portion 5a proximal end side region 5b of cylindrical portion distal end side region 5c of cylindrical portion 5d connecting portion between cylindrical portion and lid portion connecting portion 5f connecting cylindrical portion and flange portion flange portion 5p projection 5x cylinder Distal end 5y of the cylindrical portion 5z of the proximal end of the cylindrical portion expanded diameter step portion 6 low melting point glass 7 stem 8 resistance welding electrode 9 welding stage 9a holding recess 10 optical element L axial direction of the cylindrical portion Length La The axial length Da of the distal end side region of the tubular portion Da The diameter Db of the proximal end side region of the tubular portion Minimum diameter R of the distal end side region of the tubular portion R Curved portion R1 Start end (start end of the curved portion)
R2 end (end of bend)
x Straight line (straight line extending to the tip side along the inner surface of the cylindrical part)
y straight line (straight line extending to the base end side along the inner surface of the lid)
x1 straight line (straight line extending to the base end side along the outer surface of the cylindrical portion)
y1 straight line (straight line extending inward along the outer surface of the flange)

Claims (9)

A lidded cylindrical cap body having a lid connected to the distal end of the cylindrical portion and a flange portion to which the resistance welding electrode abuts from the distal end to the proximal end of the cylindrical portion; In an optical cap component comprising a light transmitting member that is fixed to a lid portion of the cap body with a low melting point glass and seals a through hole formed in the lid portion.
An optical cap component characterized in that an outer diameter of the cylindrical portion is smaller in diameter in a region having a predetermined axial width on the distal end side than a region on the proximal end side including a proximal end portion.   The optical cap part according to claim 1, wherein the cylindrical portion has a uniform thickness in the entire region.   3. The outer peripheral surface of the cylindrical portion has no portion where the distal end side has a larger diameter than the proximal end side in the process of transition from the proximal end side to the distal end side. Optical cap parts.   The outer peripheral surface of the cylindrical portion gradually reduces in diameter as the region of 50 to 80% from the distal end side toward the proximal end side with respect to the entire region shifts from the proximal end side to the distal end side. The optical cap according to any one of claims 1 to 3, wherein the base end side region that is smoothly or bent continuously has the same diameter from the base end portion to the tip end side. parts.   The outer peripheral surface of the cylindrical portion has a minimum diameter of a region of 50 to 80% from the distal end to the proximal side with respect to the entire region, and a region on the proximal end that is connected to the region smoothly or bent. The optical cap component according to claim 4, wherein a difference from the diameter is set to be 10 μm or more.   The outer peripheral surface of the cylindrical part has a 50 to 80% region from the distal end side to the proximal end side with respect to the entire region, and has the same diameter from the proximal end side to the distal end side. The optical cap component according to any one of claims 1 to 3, wherein a region on the base end side connected through the step portion has the same diameter from the base end side end portion to the tip end side.   The outer peripheral surface of the cylindrical portion has a diameter of a region of 50 to 80% from the distal end to the proximal end with respect to the entire region, and a region on the proximal end connected to the region via an enlarged diameter step portion. The optical cap part according to claim 6, wherein a difference from the diameter is set to be 10 μm or more.   The optical cap component according to claim 1, wherein the cap body is a press-molded product or a cut product.   The optical cap component according to claim 1, wherein the resistance welding electrode includes a collet chuck mechanism.

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