JP2015106687A - Sheet sticking device and sheet sticking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet sticking device and a sheet sticking method which can stick a radio wave absorption sheet to a desired position without redoing.SOLUTION: There is provided a sheet sticking device 1 in which a cap for shield installed in an optical transceiver includes an upper wall, an acute angle flexure part which continues to the upper wall in an acute angle state, and a front wall which continues to the acute angle flexure part and extends in a vertical direction with respect to the upper wall, and which sticks a radio wave absorption sheet on the inner surface of the upper wall. The sheet sticking device 1 includes: a slider holding member 35 which holds the radio wave absorption sheet whose surface to be stuck to the inner surface of the upper wall is directed outward and has a tip arranged between the inner surface of the upper wall and the inner surface of the acute angle flexure part; a slider member 42 which pushes the held radio wave absorption sheet toward the cap by holding it between the inner surface of the upper wall and the inner surface of the acute angle flexure part; and a holding base 12 which holds the cap whose inner surface of the upper wall and inner surface of the front wall are directed outward and can rotate the inner surface of the upper wall toward the tip.

Description

  The present invention relates to a sheet affixing device and a sheet affixing method, and more particularly to a sheet affixing device and a sheet affixing method for affixing a radio wave absorbing sheet to a shield cap installed in an optical transceiver.

  The optical transceiver includes a photoelectric conversion element, and can transmit and receive an optical signal via an optical connector. This optical transceiver has a receptacle and a metal housing, and an optical connector is detachably connected to the receptacle. On the other hand, in addition to photoelectric conversion elements, circuit boards and the like are accommodated in the housing. On the circuit board, a large number of electronic components that exchange electric signals with the photoelectric conversion elements are mounted, and a desired electric circuit is formed.

This optical transceiver generates high-frequency signals, and it is extremely important to reduce external electromagnetic radiation (EMI) so that peripheral devices do not malfunction.
For example, Patent Document 1 discloses a technique of an optical transceiver for reducing EMI by providing a shielding cap in addition to a metal cover. Specifically, as shown in FIG. 11A, the housing 60 includes a housing 61, a cover 62, and a shielding cap 66, for example. The housing 61 is formed in a U-shaped cross section that opens upward. The cover 62 is configured to be able to come into contact with the opening periphery of the housing 61, and the housing 60 having a rectangular cross section is formed by closing the opening of the housing 61 from above.

A photoelectric conversion element, an electronic component, and the like are accommodated in the housing 60. A receptacle 63 is disposed on the front side of the housing 60, and has an opening through which, for example, two optical connectors (not shown) can be attached and detached.
A light emitting element assembly 64 and a light receiving element assembly 65 are disposed in the housing 61. The light emitting element assembly 64 corresponds to a transmission TOSA (Transmitter Optical Sub-Assembly), and is configured to be larger than the light receiving element assembly 65, for example. The package 64a accommodates a semiconductor laser (LD: Laser Diode) and a lens.

  The light receiving element assembly 65 corresponds to a receiving optical sub-assembly (ROSA) for receiving, and a photodiode (PD: Photo Diode) and a lens are accommodated in the package 65a. The light emitting element assembly 64 and the light receiving element assembly 65 are covered with a shield cap 66 from above, and further covered with a cover 62.

  As shown in FIG. 11B, the shielding cap 66 includes, for example, an upper wall 67, an acute angle bending portion 68, a front wall 69, and a side wall 70. The upper wall 67 covers the top of the light emitting element assembly 64 and the light receiving element assembly 65. The acute angle bent portion 68 is bent at a size of 90 ° or less with respect to the upper wall 67 in order to improve the strength of the shielding cap 66. The front wall 69 has a U-shaped cut that forms an opening of the light-emitting element assembly 64 and the light-receiving element assembly 65, continues to the acute-angle bend 68, and extends in a direction perpendicular to the upper wall 67. The side wall 70 is connected to both sides of the upper wall 67 and extends rearward. A hook 70 a that engages with the peripheral edge of the housing 61 is formed in the side wall 70 near the front wall 69.

  In order to reduce EMI, it is effective to eliminate a gap in the optical transceiver casing. Thus, for example, Patent Document 2 discloses a technique for reducing EMI using a radio wave absorber. As the radio wave absorber, for example, a rectangular radio wave absorption sheet having an adhesive surface is known, and a radio wave absorption sheet having a predetermined thickness is attached to the inner surface of the upper wall 67 shown in FIG. And the gap in the housing can be filled.

JP 2011-209683 A JP 2000-124483 A

However, with the downsizing and high density of optical transceivers, the structure inside the housing has become complex, and in order to maximize the effect of the radio wave absorbing sheet, the radio wave absorbing sheet is pasted at an accurate position. There is a problem that it is necessary.
In particular, the adhesive surface of the radio wave absorbing sheet is strongly adhesive to prevent it from peeling off from the inner surface of the upper wall due to vibration or impact, so it is difficult to reattach it once it is applied to the inner surface of the upper wall. This increases the difficulty of assembling the optical transceiver.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sheet sticking apparatus and a sheet sticking method capable of sticking a radio wave absorbing sheet to a desired position without re-doing.

  In the sheet sticking device according to the present invention, a shielding cap installed in the optical transceiver is connected to the upper wall, an acute angle bending portion connected to the upper wall in an acute angle state, connected to the acute angle bending portion and to the upper wall. A sheet affixing device having a front wall extending in the vertical direction and affixing a radio wave absorbing sheet to the inner surface of the upper wall, the holding of the radio wave absorbing sheet with the surface affixed to the inner surface of the upper wall facing outward And a slider holding member having a tip portion disposed between the inner surface of the upper wall and the inner surface of the acute angle bending portion, and the held electromagnetic wave absorbing sheet, the inner surface of the upper wall and the acute angle bending portion. A slider member that is pushed toward the cap so as to be sandwiched between the inner surface of the upper wall and the cap with the inner surface of the upper wall and the inner surface of the front wall facing outward, and the inner surface of the upper wall facing the tip And a rotatable holder towards.

  In the sheet sticking method according to the present invention, the shielding cap installed in the optical transceiver is connected to the upper wall, the acute angle bending portion connected to the upper wall in an acute angle state, the acute angle bending portion, and the upper wall. A sheet sticking method comprising a front wall extending in a vertical direction with respect to the inner surface of the upper wall, wherein the cap faces the inner surface of the upper wall and the inner surface of the front wall outward. Disposing the electromagnetic wave absorbing sheet, disposing the radio wave absorbing sheet with the surface affixed to the inner surface of the upper wall facing outward, and bending the arranged radio wave absorbing sheet to the inner surface of the upper wall and the acute angle Repositioning between the inner surface of the portion, and pushing the rearranged radio wave absorbing sheet toward the cap so as to be sandwiched between the inner surface of the upper wall and the inner surface of the acute angle bending portion; A step of pushing the electromagnetic wave absorbing sheet sandwiched between an inner surface of the upper wall and an inner surface of the acute angle bending portion toward the cap; and a step of rotating the inner surface of the upper wall toward the electromagnetic wave absorbing sheet. Including.

  According to the sheet sticking apparatus and the sheet sticking method of the present invention, the radio wave absorbing sheet can be stuck at an accurate position without re-execution.

It is a figure which shows an example of the external appearance of the sheet sticking apparatus by this invention. It is a figure which shows the external appearance of the sheet sticking apparatus of FIG. It is a figure which shows the external appearance of a part of holding stand of FIG. (A) is a figure explaining the position of a shield cap and the support | pillar of a cap holding | maintenance part, (B) is a figure explaining installation of the shield cap to a cap holding | maintenance part. It is a figure which shows the external appearance of the sheet | seat holding | maintenance part of FIG. (A) is a figure explaining the slider member and slider holding member of FIG. 5, (B) is a figure which shows the external appearance of a radio wave absorption sheet. It is a figure explaining installation of the electromagnetic wave absorption sheet to a shield cap. It is a figure explaining installation of the electromagnetic wave absorption sheet to a shield cap. It is a figure explaining installation of the electromagnetic wave absorption sheet to a shield cap. It is a figure explaining the shield cap with an electromagnetic wave absorption sheet. It is a figure which shows an example of an optical transceiver.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments according to a sheet sticking apparatus and a sheet sticking method of the present invention will be described with reference to the accompanying drawings.
1 and 2 are views showing an example of the appearance of a sheet sticking apparatus according to the present invention. The sheet sticking apparatus 1 has a pedestal 2 having a predetermined thickness, and the cap holding unit 10 and the sheet holding unit 30 are erected on the pedestal 2 in the X direction. Moreover, the height of the base 2 is formed so that it may become low, for example along the positive direction of a Y-axis.

  As shown in FIG. 2, the cap holding unit 10 includes a rotation support base 11, a holding base 12, a rotation shaft 18, and a grip part 19. Specifically, the rotation support base 11 is fixed to the base 2, and both ends of the holding base 12 in the Y direction are rotatably supported by the rotation support base 11. The grip 19 is provided on the upper surface of the holding table 12, and the holding table 12 can be easily rotated around the rotation shaft 18 by grasping the grip 19. Note that an opening for allowing the rear lower end of the rotating holding table 12 to escape is formed at the rear end of the rotation support table 11.

  FIG. 3 is a view showing an appearance of a part of the holding table of FIG. A part of the holding table 12 is disposed between the upper wall support 16 of the holding table 12 and the sheet holding unit 30 illustrated in FIG. 2, and includes a front wall mounting unit 13, a groove 14, and an upper wall mounting unit 15. , And has a support column 17. The illustrated holding table 12 has a separate structure in which the upper wall mounting portion 15 side and the upper wall support portion 16 side are screwed, but may be an integral structure.

  The upper wall placing portion 15 can place a boundary portion between the upper wall 67 of the shield cap 66 described with reference to FIG. The support columns 17 are formed, for example, in a rectangular cross section, and are respectively provided at both ends of the upper wall placement portion 15 in the Y direction. The distance from the outer surface of one support column 17 to the outer surface of the other support column 17 viewed in the Y direction corresponds to the distance from the inner surface of one side wall 70 of the shield cap 66 to the inner surface of the other side wall 70. To do. For this reason, each column 17 is located between the side wall 70 and the side wall 70, and can be engaged with the inner side surface of the side wall 70.

Further, a gap corresponding to the thickness of the upper wall 67 of the shield cap is formed between the back surface 17b of the support column and the upper wall support portion 16 as viewed in the X direction.
The front wall placing portion 13 is provided at a position higher than the upper wall placing portion 15 and can place the front wall 69 of the shield cap turned upside down. Specifically, the front wall mounting portion 13 and the upper wall mounting portion 15 are arranged in parallel, and receive the acute angle bending portion 68 by the height difference between the front wall mounting portion 13 and the upper wall mounting portion 15. be able to.

  FIG. 4A is a view for explaining the positions of the shield cap and the column of the cap holding portion. The acute angle bending portion 68 of the shield cap 66 is connected to the upper wall 67 in an acute angle state, and the bending angle of the acute angle bending portion 68 is smaller than 90 degrees, for example, about 60 degrees. In addition, recesses for receiving the pillars 17 are formed at both ends of the front wall 69 in the Y direction. The shield cap corresponds to the shield cap of the present invention.

  FIG. 4B corresponds to a cross-sectional view taken along the line IV-IV in FIG. 1 and is a diagram illustrating installation of the shield cap on the cap holding portion. In FIG. 4B, the holding part 19 is not shown in order to clearly show the shape of the shield cap 66. When the upper wall 67 is inserted into the gap between the back surface 17b of the support column and the upper wall support 16 and the side wall 70 is hugged from the outside of the support column 17, the shield cap 66 is attached to the inner surface 67a of the upper wall or the inner surface of the front wall. It is held on the holding table 12 with 69a or the like facing outward. 4 corresponds to the side wall 70 adjacent to the light emitting element assembly 64 shown in FIG.

  1 and 2, the sheet holding unit 30 includes a post 31, a slider holding member 35, and a slider member 42. In FIG. 2, descriptions of the slider holding member 35, the slider member 42, and the like are omitted to clearly show the shape of the cap holding portion 10. The post 31 is fixed to the pedestal 2 and extends in the Z direction. The slider holding member 35 and the slider member 42 are slidable with respect to the post 31, and are formed so that the radio wave absorbing sheet can be pushed toward the shield cap.

5A and 5B are views showing the appearance of the sheet holding portion of FIGS. 1 and 2, FIG. 6A is a diagram for explaining the slider member and the slider holding member of FIG. 5, and FIG. It is a figure which shows an external appearance.
As shown in FIG. 5, the post 31 has a portion protruding in the negative direction of the X axis, and a slope 32 is formed at the tip of the protruding portion. The angle of the inclined surface 32 is a size required for pushing the slider member 42 toward the shield cap. For example, the angle formed by the inclined surface 32 and the upper wall 67 described with reference to FIG. The size is about half of the angle formed by the wall 67 and the acute angle bent portion 68.

  A slide guide 33 is provided on the upper surface of the post 31, and a guide groove 34 for moving the slider holding member 35 is formed in the slide guide 33. Specifically, the guide groove 34 is formed in a horizontal direction above the post 31 and moves the slider holding member 35 in the horizontal direction. The horizontal slider holding member 35 is supported on the upper surface of the post 31 and the tip of the slide guide 33.

  The slider holding member 35 has arms 37 positioned on both ends of the slide guide 33, one end of the arm 37 is connected by a support shaft 36 extending in the Y direction, and the support shaft 36 is loosely fitted in the guide groove 34. Yes. The other end of the arm 37 extends in the negative direction of the X axis and has a tip portion 37a. As shown in FIG. 6, the tip end portion 37 a includes a slider mounting surface 38, a sheet placement surface 39, and a bank 41, and the sheet placement surface 39 is provided between the slider mounting surface 38 and the bank 41. The width in the Y direction of the distal end portion 37a is shorter than the distance between the support columns 17 of the holding table 12 described with reference to FIGS.

Further, a guide member 37b is provided at the distal end portion 37a of the arm 37 on the right side (corresponding to the positive direction of the Y axis) as viewed in FIG. The guide member 37b has a guide surface 37c that abuts and supports a side surface of a radio wave absorbing sheet described later. The tip of the guide member 37b in the negative direction of the X axis is chamfered to prevent contact with the support column 17.
The electromagnetic wave absorbing sheet 80 shown in FIG. 6B is a slider in which powder of a magnetic material (for example, ferrite) is kneaded into a base material of a rectangular rubber (for example, silicon), and is arranged in the horizontal direction. The adhesive surface 81 is set outward with respect to the holding member 35.

Here, for example, when the radio wave absorption sheet 80 is attached to the periphery of the light emitting element assembly and is not applied to the periphery of the light receiving element assembly, the radio wave absorption sheet 80 is set at a position indicated by a broken line in FIG. .
Specifically, the pedestal 2 described with reference to FIGS. 1 and 2 is inclined so that the seat side surface 83 shown in FIG. 6B is always in contact with and supported by the guide surface 37c of the guide member 37b. When setting the sheet 80, first, for example, the operator grasps the opposite side of the sheet side surface 83 with a finger, and contacts the guide surface 37c with the sheet side surface 83 facing downward. Next, when the finger that has been gripped is released, as shown by a broken line in FIG. 6A, it is easy to set the radio wave absorbing sheet 80 in a state of being close to the right side of the sheet placing surface 39.

  When the radio wave absorbing sheet 80 is pushed out toward the shield cap, the radio wave absorbing sheet 80 first protrudes forward on the bank 41 of the tip end portion 37a while being supported by the guide surface 37c of the guide member 37b. Subsequently, the radio wave absorbing sheet 80 protruding from the bank 41 is directed to the back of the shield cap while being supported by the inner side surface 17a of the support column described in FIG. For this reason, the guide member 37b and the support column 17 correspond to a spacer (also referred to as a mask) for providing a sheet prohibited area of the side wall 70, and the radio wave absorbing sheet 80 is attached to a reference line (indicated by a two-dot chain line in FIG. 6A). It becomes possible to affix to the shield cap so as not to approach the positive direction of the Y axis.

The seat front surface 82 shown in FIG. 6B is arranged behind the bank 41, but the step between the sheet placing surface 39 and the bank 41 is eliminated between the sheet placing surface 39 and the bank 41. The inclined surface is more preferable because the front surface 82 of the sheet is less likely to be caught on the bank 41 when the radio wave absorbing sheet 80 is pushed out.
The slider member 42 has a sheet pressing piece 43 and a gripping piece 44, and the gripping piece 44 is formed tall behind the sheet pressing piece 43. The sheet pressing piece 43 is disposed so that the rear surface of the radio wave absorbing sheet 80 can be pressed behind the sheet mounting surface 39 until the radio wave absorbing sheet 80 is pushed out from the sheet mounting surface 39.

Further, the slider member 42 is arranged close to the left side (corresponding to the negative direction of the Y axis) as viewed in FIG. 6A, and when the radio wave absorbing sheet 80 is attached to the shield cap on the inclined pedestal. The contact between the gripping piece 44 and the side wall 70 located in the positive direction of the Y axis in FIG. 4B is prevented.
Returning to FIG. 5, the guide groove 34 of the slide guide 33 is formed obliquely downward at a position above the slope 32 and then vertically downward. Thereby, the slider holding member 35 in a horizontal posture can be disposed on the slope 32 in a posture inclined along the slope 32.

7-9 is a figure explaining installation of the electromagnetic wave absorption sheet to a shield cap, and FIG. 10 is a figure explaining the shield cap with an electromagnetic wave absorption sheet.
For example, first, with the shield cap 66 facing the inner surface 67a of the upper wall described with reference to FIG. 4B, the inner surface 68a of the acute angle bend and the inner surface 69a of the front wall outward, the inner surface of the side wall 70 and the column 17 The lower surface is lowered so as to face the outer side surface, and the upper wall 67 is inserted into the gap between the back surface 17b of the support column and the upper wall support portion 16 and arranged on the holding table 12 (cap arrangement step). On the other hand, the radio wave absorbing sheet 80 is arranged on the sheet placing surface 39 with the adhesive surface 81 facing upward with respect to the slider holding member 35 in a horizontal posture (sheet arranging step).

Then, the slider holding member 35 is moved along the guide groove 34 of the slide guide 33, and as shown in FIG. 7, the slider holding member 35 is arranged on the inclined surface 32, and the tip 37a thereof is shown in FIG. It arrange | positions between the inner surface 67a of the upper wall demonstrated, and the inner surface 68a of an acute angle bending part (slider holding member positioning process (equivalent to the sheet | seat rearrangement process of this invention)).
Subsequently, as indicated by an arrow in FIG. 7, the slider member 42 is moved on the slider holding member 35, and the radio wave absorbing sheet 80 is pushed out toward the shield cap 66 by the sheet pressing piece 43 (sheet pushing process).

As a result, the radio wave absorbing sheet 80 protrudes from the slider holding member 35 with the sheet front surface 82 at the head while the sheet side surface 83 shown in FIG. 6A is supported by the guide surface 37c of the guide member 37b. The support of the projecting radio wave absorbing sheet 80 is taken over by the support column 17, and the sheet side surface 83 is supported by the inner surface 17a of the support column.
In this case, as shown in FIG. 8A, the sheet front surface 82 has an upper side 82a located on the adhesive surface 81 side in contact with the inner surface 67a of the upper wall, and a lower side 82b located on the opposite side of the adhesive surface 81 has an acute angle. The sheet front surface 82 is held between the inner surface 67a of the upper wall and the inner surface 68a of the acute angle bending portion.

  After that, when the slider member 42 is further moved on the slider holding member 35 and the front surface 82 of the sheet is further pushed toward the shield cap 66, the radio wave absorbing sheet 80 is bent as shown in FIG. 81 curves in a convex shape toward the inner surface 67a of the upper wall. As a result, the front surface 82 of the sheet is pushed to the back of the shield cap 66, and the attachment position of the upper side 82a with respect to the inner surface 67a of the upper wall is determined (sheet pushing process).

Next, as shown by the arrow in FIG. 9, when the holding base 12 is rotated around the Y axis, the inner surface 67a of the upper wall faces the adhesive surface 81 of the radio wave absorbing sheet 80 located on the tip portion 37a. The entire surface of the adhesive surface 81 is affixed to the inner surface 67a of the upper wall (cap rotation process).
As a result, when the shield cap 66 with the radio wave absorbing sheet 80 is taken out of the holding base 12, as shown in FIG. 10A, the upper side 82a of the sheet front surface 82 comes into contact with the inner surface 67a of the upper wall and the lower side 82b. Is in contact with the inner surface 68a of the acute angle bent portion, the radio wave absorbing sheet 80 is sandwiched between both the upper wall 67 and the acute angle bent portion 68.

Therefore, as shown in FIG. 10 (B), the seat front surface 82 is not inclined with respect to the formation direction of the front wall 69 but is attached to the inner surface 67a of the upper wall in a state aligned with the formation direction of the front wall 69. Can do.
In addition, first, since the sheet side surface 83 is supported by the guide member 37b of the slider holding member 35, the sheet side surface 83 is not inclined with respect to the formation direction of the guide member 37b, and the side wall 70 facing the guide member 37b is formed. It can be attached to the inner surface 67a of the upper wall in a state aligned in the forming direction.

  Furthermore, if the sheet side surface 83 is also supported by the support column 17 described with reference to FIG. 4A, when the radio wave absorbing sheet 80 crushed at the back of the shield cap 66 returns to its original shape, the sheet side surface 83 becomes the side wall 70. The sheet side surface 83 can be attached to the inner surface 67a of the upper wall in a state where the sheet side surface 83 is aligned in the direction in which the side wall 70 is formed. Furthermore, a clearance for allowing the hook 70a to engage with the peripheral edge of the housing can be secured.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Sheet sticking apparatus, 2 ... Base, 10 ... Cap holding part, 11 ... Rotation support base, 12 ... Holding base, 13 ... Front wall mounting part, 14 ... Groove, 15 ... Upper wall mounting part, 16 ... Upper wall support portion, 17 ... post, 17a ... inner side surface of the post, 17b ... back surface of the post, 18 ... rotating shaft, 19 ... grip portion, 30 ... sheet holding portion, 31 ... post, 32 ... slope, 33 ... slide Guide, 34 ... Guide groove, 35 ... Slider holding member, 36 ... Support shaft, 37 ... Arm, 37a ... Tip, 37b ... Guide member, 37c ... Guide surface, 38 ... Slider mounting surface, 39 ... Sheet mounting surface, 41 ... bank, 42 ... slider member, 43 ... sheet pressing piece, 44 ... gripping piece, 60 ... housing, 61 ... housing, 62 ... cover, 63 ... receptacle, 64 ... light emitting element assembly, 64a ... package, 65 ... light receiving Element assembly, 65a ... 66, shield cap, 67 ... upper wall, 67a ... inner surface of upper wall, 68 ... acute angle bend, 68a ... inner surface of acute bend, 69 ... front wall, 69a ... inner surface of front wall, 70 ... side wall, 70a DESCRIPTION OF SYMBOLS ... Hook, 80 ... Radio wave absorption sheet, 81 ... Adhesive surface, 82 ... Sheet front surface, 82a ... Upper side, 82b ... Lower side, 83 ... Sheet side surface.

Claims (4)

A cap for shielding installed in the optical transceiver includes an upper wall, an acute angle bent portion that is continuous with the upper wall in an acute angle state, and a front wall that is continuous with the acute angle bent portion and extends in a direction perpendicular to the upper wall. A sheet sticking device for sticking a radio wave absorbing sheet to the inner surface of the upper wall,
A slider holding unit that holds the radio wave absorption sheet with a surface attached to the inner surface of the upper wall facing outward, and a tip portion disposed between the inner surface of the upper wall and the inner surface of the acute angle bending portion. Members,
A slider member that pushes the held radio wave absorbing sheet toward the cap so as to be sandwiched between the inner surface of the upper wall and the inner surface of the acute angle bend;
A sheet sticking apparatus, comprising: a holding base that holds the cap with the inner surface of the upper wall and the inner surface of the front wall facing outward, and that can rotate the inner surface of the upper wall toward the tip.   The sheet sticking device according to claim 1, wherein the slider holding member includes a guide member that contacts and supports a side surface of the radio wave absorbing sheet when the radio wave absorbing sheet is pushed toward the cap.   The cap includes side walls that are continuous with both sides of the upper wall, and the holding base engages with the side wall to position the cap and absorbs the radio wave when the radio wave absorbing sheet is pushed toward the cap. The sheet sticking apparatus according to claim 2, further comprising a support column that contacts and supports the side surface of the sheet. A cap for shielding installed in the optical transceiver includes an upper wall, an acute angle bent portion that is continuous with the upper wall in an acute angle state, and a front wall that is continuous with the acute angle bent portion and extends in a direction perpendicular to the upper wall. , A sheet sticking method for sticking a radio wave absorbing sheet to the inner surface of the upper wall,
Disposing the cap with the inner surface of the upper wall and the inner surface of the front wall facing outward;
Placing the radio wave absorbing sheet with the surface to be attached to the inner surface of the upper wall facing outward;
Rearranging the arranged radio wave absorbing sheet between the inner surface of the upper wall and the inner surface of the acute angle bend;
Extruding the rearranged radio wave absorbing sheet toward the cap so as to be sandwiched between the inner surface of the upper wall and the inner surface of the acute angle bend;
Pushing the electromagnetic wave absorbing sheet sandwiched between the inner surface of the upper wall and the inner surface of the acute angle bend toward the cap;
Rotating the inner surface of the upper wall toward the radio wave absorbing sheet.

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