JP2015022007A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device that improves assembly workability.SOLUTION: An imaging device comprises: a substrate (800) that is arranged at a prescribed gap (D) spaced from members constituting the imaging device; and a first connection member (906) that includes a first connection part (906a) to be connected to the substrate (800). The first connection member (906) includes at least one extension part (906b and 906c) extending from a position different from the first connection part (906a). At least one of the extension part (906b and 906c) is arranged so as to bridge the prescribed gap (D). The imaging device comprises a second connection member (151) that including a second connection part (151a) to be connected to the substrate (800) after the first connection part (906a) having the first connection member (906) provided is connected to the substrate (800). The second connection part (151a) is assembled as passing over the extension part (906b and 906c).

Description

  The present invention relates to an improvement in assembling property of an imaging apparatus.

  In recent years, in a case that constitutes the exterior of a camera, a characteristic design as in Patent Document 1 is required in order to improve the appearance quality by eliminating the joint portion between the front cover that constitutes the front surface and the top cover that constitutes the upper surface. Has been.

  In the camera in Patent Document 1, the front cover unit constitutes the front of the camera, and an upper surface operation system including a release button, a power button, a mode dial, a zoom lever and the like constituting the upper surface is also integrated. It has a smooth appearance design.

  In such a camera, a release switch corresponding to each upper surface operation system provided on the front cover, a power switch, a dial pattern for mode detection corresponding to the rotation position of the mode dial, and a rotation position of the zoom lever An upper surface operation type flexible wiring board on which a zoom switching pattern is mounted is also integrally attached to the front cover to form a unit.

  Therefore, it is possible to achieve high positional accuracy between the operation system and the mounting surface of the upper surface operation system flexible wiring board corresponding to these operation systems.

JP 2010-49006 A

  However, in the camera shown in Patent Document 1, since the upper surface operation system flexible wiring board is integrally formed with the front cover assembled from the front, the electronic circuit board is mounted after the front cover is assembled into the camera body. It is necessary to insert a flexible wiring board on the top surface.

  In such a configuration, an electronic circuit board is generally provided on the back side of the camera. In other words, the upper surface operation system flexible wiring board has to be wrapped up to the back of the camera body while getting over the camera body at the same time that the front cover is assembled from the front. At this time, if a groove such as a gap formed between the battery chamber and the electronic circuit board in Patent Document 1 is in the passage path of the upper surface operation system flexible wiring board, the upper surface operation system flexible wiring board enters the groove, The assembly work was very difficult.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an improved assembling property of an imaging apparatus.

In order to achieve the above object, the present invention is configured as follows. That is,
A board (800) on which electronic components are mounted and arranged with a predetermined distance (D) from members constituting the imaging device;
A first connecting member (906) comprising a first connecting portion (906a) connected to the substrate (800);
After the first connection portion (906a) is connected to the substrate (800), a second connection member (151) including a second connection portion (151a) connected to the substrate (800).
In an imaging apparatus comprising:
The first connecting member (906) includes at least one extending portion (906b, 906c) extending from a position different from the first connecting portion (906a) connected to the substrate (800), Of the extending portions (906b, 906c), at least one of the extending portions (906b) is disposed so as to bridge the predetermined distance (D) and is provided on the second connecting member (151). Further, the second connecting portion (151a) is constructed so as to pass through the extending portions (906b, 906c) and be incorporated therein.

  According to the present invention, the assembling property of the imaging apparatus can be improved.

It is the external appearance perspective view which looked at the camera main body from the front side. It is the external appearance perspective view which looked at the camera main body from the back side. It is the disassembled perspective view which looked at the camera main body from the front side. It is a disassembled perspective view which shows the structure of a front cover unit. It is a disassembled perspective view which shows the structure of a rear cover unit. It is the disassembled perspective view which looked at the main unit from the front side. It is the disassembled perspective view which looked at the main unit from the back side. It is the figure which looked at the flash light-emitting device unit from the upper surface. It is the perspective view which looked at the main unit from the back side at the time of a flash light emitting device unit assembly. It is the figure which looked at the main unit from the upper surface after the flash light emitting device unit is assembled. It is the perspective view which looked at the camera main body from the back side at the time of a front cover unit assembly | attachment. It is the figure which looked at the camera main body from the upper surface at the time of a front cover unit assembly | attachment. It is the figure which looked at the camera main body from the upper surface at the time of a front cover unit assembly | attachment. It is sectional drawing which shows the structure which follows the arrow AA line of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 are external perspective views of a camera body 1 on which the present invention is mounted.

  In FIG. 1, reference numeral 101 denotes a front cover, and reference numeral 400 denotes a lens barrel unit including a lens barrel including a photographing optical system lens, a lens barrier, a photoelectric conversion element such as a CCD, a feeding mechanism, a zoom mechanism, and a shutter.

  Reference numeral 102 denotes a power button. By operating the power button 102, the camera body 1 can be put into a start state or a stop state.

  Reference numeral 103 denotes a shutter button, which can be pressed in two steps. When the shutter button 103 is pressed halfway, a shooting preparation operation (photometry operation, distance measurement operation, etc.) is started, and when the shutter button 103 is fully pressed, a shooting operation (exposure to a photoelectric conversion element such as a CCD) starts. Is done.

  Reference numeral 104 denotes a zoom switching lever operated to change the focal length of the photographing optical system. The zoom switching lever 104 is disposed so as to surround the shutter button 103 and is rotatable with respect to the shutter button 103. When the zoom switching lever 104 is rotated in one direction, the focal length of the photographing optical system can be switched in the wide direction, and when the zoom switching lever 104 is rotated in the other direction, the focal length of the photographing optical system can be switched in the tele direction. .

  Reference numeral 105 denotes a mode setting dial, which is rotatably supported with respect to the camera body 1. Modes such as still image shooting, moving image shooting, and various scene modes are assigned according to the rotation position, and each mode can be set by rotating the mode setting dial 105.

  Reference numeral 900 denotes a pop-up flashlight unit for irradiating a subject with irradiation light.

  When the opening / closing operation knob 900a is manually rotated in the direction of arrow A, a flash light emitting portion appears, which emits light at the time of shooting when the amount of light is insufficient, such as at night or in a dark place, thereby assisting shooting.

  106 is an auxiliary light, which assists AF operation by emitting light when shooting in a dark place, and is used as a means for confirming the subject by emitting light when using a self-timer, and also for the purpose of reducing red-eye. Used for light emission.

  Reference numerals 107 and 108 denote a decorative ring and a decorative plate, which are attached to the front cover 101 to enhance the appearance design.

  109 is a string passage hole for passing a wrist strap for preventing accidental fall of the image pickup apparatus, and is provided on both sides of the camera body 1.

Reference numeral 502 denotes a battery lid that covers the opening of the battery storage chamber for storing the battery and the opening of the recording medium storage chamber for storing the recording medium, and is attached to the camera body 1 so as to be rotatable.
When the battery cover 502 is rotated from the state shown in the drawing, the battery storage chamber and the recording medium storage chamber can be opened, and in this state, the battery and the recording medium can be taken in and out.

  In FIG. 2, 201 is a rear cover, 202 is substantially colorless and transparent, and the back side is subjected to a frame-shaped blindfold printing, and a double-sided tape is pasted on the blindfolded printed portion in a square shape, and then displayed. It is a liquid crystal protective window that is adhered and fixed to the rear cover 201 so as to cover the part. The liquid crystal protection window 202 may be provided with an antireflection coating, a hard coat that hardens the surface, an antifouling coat to make it easier to remove dirt, an antistatic coat that suppresses adhesion of dust due to static electricity, and the like.

  Reference numeral 203 denotes a moving image button, which can be operated to give instructions for starting and ending moving image shooting.

  When the moving image button 203 is pressed while no moving image is being shot, moving image shooting is started, and when the moving image button 203 is pressed during moving image shooting, the moving image shooting is ended.

  Reference numeral 204 denotes a playback button, which can be switched between shooting mode / playback mode by operating this button.

  Reference numeral 205 denotes an exposure adjustment button, which can shift to a mode in which an exposure value can be set.

  Reference numeral 206 denotes a display button, which can switch information displayed on the display unit.

  A menu button 207 can be switched to a menu screen for changing various setting values by operating the menu button.

  These various settings are executed by using the cross button 208 and pressing the set button 209.

  Reference numeral 210 denotes a jack cover, which protects a USB connector mounted on a main wiring board (not shown), which will be described later. The jack cover 210 is made of a relatively soft resin, and its hinge portion is configured to be easily bent.

  Next, the internal configuration of the apparatus according to the present embodiment will be schematically described with reference to FIGS.

  As shown in FIG. 3, the housing of the camera body 1 has two cover unit configurations of a front cover unit 100 and a rear cover unit 200 that are assembled with the main unit 1000 interposed therebetween.

  The front cover unit 100 is a member that covers the front side of the camera body 1, and the rear cover unit 200 is a member that covers the back side of the camera body 1.

  As shown in FIG. 4, the front cover unit 100 forms the upper surface operation system with the front cover 101. The power button 102, shutter button 103, zoom switching lever 104, mode setting dial 105, and upper surface operation system flexible print described above. The wiring board 151 and the top plate 152 are included.

  In the present embodiment, the front cover 101 is formed of a resin member (for example, PC (polycarbonate)). In order to improve the strength of the front cover 101, the front cover 101 may be formed of a resin member containing a reinforcing material such as glass fiber.

  On the upper surface operation system flexible printed circuit board 151, a power switch, a shutter switch, a zoom switching pattern corresponding to the rotation position of the zoom switching lever, a mode detection dial pattern corresponding to the rotation position of the mode setting dial, etc. Has been implemented.

  The upper surface operation type flexible printed wiring board 151 is electrically connected by inserting a connecting portion 151a provided at one end into a connector 840 mounted on a main wiring board 800 described later.

  The top plate 152 is bonded to the upper surface operation system flexible printed wiring board 151 with a double-sided tape, and is installed for the purpose of assisting the strength of the upper surface operation system flexible printed wiring board 151.

  The top plate 152 is fastened to the front cover 101 with screws together with the upper surface operation system flexible printed wiring board 151.

  As shown in FIG. 5, the rear cover unit 200 includes a rear cover 201 provided with a large rectangular hole 211, the moving image button 203, the playback button 204, the exposure adjustment button 205, and the display that constitute the rear operation system. The button 206, the menu button 207, the liquid crystal protection window 202, and the buffer member 212 are configured.

  In the present embodiment, the rear cover 201 is formed of a resin member (for example, PC (polycarbonate)). In order to improve the strength of the rear cover 201, the rear cover 201 may be formed of a resin member containing a reinforcing material such as glass fiber.

  As described above, the liquid crystal protection window 202 is substantially colorless and transparent, and the back surface is subjected to a frame-like blind print, and a double-sided tape is pasted on the blind-printed portion in a square shape, and then the rear cover 201 Are bonded and fixed so as to close the rectangular hole 211 from the outside.

  In the present embodiment, the liquid crystal protection window 202 uses PMMA (acrylic) in terms of transparency and strength. Further, the liquid crystal protective window 202 may be provided with an antireflection coating, a hard coat that hardens the surface, an antifouling coat to make it easier to remove dirt, an antistatic coat that suppresses adhesion of dust due to static electricity, and the like.

  When the rear cover 201 is incorporated in the main unit 1000, the buffer member 212 is in contact with the display device unit 700, which will be described later, while being compressed, so that dust, dust, or the like enters between the liquid crystal protection window 202 and the display device unit 700. This is a member for preventing or mitigating the impact caused by external force on the display unit.

  The buffer member 212 is affixed with a double-sided tape so as to surround the entire periphery of the peripheral edge (side surface) 211 a of the large rectangular hole 211 provided in the rear cover 201.

  As shown in FIGS. 6 and 7, the main unit 1000 includes a chassis 300, a lens barrel unit 400, a battery chamber unit 500, a back operation system unit 600, a display device unit 700, a main wiring board 800, and a flash light emitting device unit 900. It is configured.

  The lens barrel unit 400 includes a photographing optical system lens, a lens barrier, a photoelectric conversion element such as a CCD, a feeding mechanism, a zoom mechanism, a shutter, and the like, and a subject is formed by the optical system disposed inside the lens barrel unit 400. An image is formed on the image sensor.

  The lens barrel unit 400 is positioned with respect to the chassis 300 by fitting convex portions 400 a and 400 b provided for positioning on the back surface of the unit into holes 300 a and 300 b formed in the chassis 300.

  The battery chamber unit 500 includes a battery chamber 501 and a battery lid 502 made of a resin member made of a non-conductor, and is configured as a main structure of the camera body 1 together with the chassis 300.

  The battery chamber 501 is formed with an opening of a battery storage chamber for storing a battery (not shown) and an opening of a recording medium storage chamber for storing a recording medium.

  Therefore, it is desirable that the battery chamber 501 is made of a resin member made of a non-conductive material so as to prevent a short circuit with the battery inserted into and removed from the battery chamber 501.

  The battery chamber 501 is also integrally formed with a tripod seat for fixing and holding the camera body 1 on a tripod, a monopod or the like.

  From this viewpoint, in this embodiment, PC-G 20% (with polycarbonate and 20% glass filler) is used as the material for the battery chamber 501. Depending on the degree of rigidity, the glass filler composition may be changed, or engineering plastics such as ABS and PC-ABS may be used.

  The battery cover 502 is attached so as to cover the opening of the battery storage chamber for storing the battery and the opening of the recording medium storage chamber for storing the recording medium, and is attached so as to be rotatable about the rotation shaft 503.

  The battery chamber unit 500 is positioned with respect to the chassis 300 by fitting convex portions 500 a and 500 b provided for positioning into holes 300 c and 300 d formed in the chassis 300.

  The back operation system unit 600 includes a metal plate 601 and a back operation system flexible printed wiring board 602 that is bonded and fixed to a predetermined position with a double-sided tape on the plate.

  On the rear operation system flexible printed wiring board 602, a tact switch that is electrically operated when a button of a moving image button, a reproduction button, an exposure adjustment button, a display button, or a menu button is pressed, and a multi-function operation device are mounted.

  The rear operation system unit 600 is positioned with respect to the chassis 300 by fitting the holes 600a and 600b provided for positioning with the projections 300g and 300h formed in the chassis 300, and the rear operation system flexible print. The wiring board 602 is electrically connected by being inserted into a connector 810 mounted on a main wiring board 800 described later.

  The display unit 700 is composed of a display panel (display unit) composed of two pieces of glass and a backlight unit composed of a light guide plate, a reflection sheet, a brightness enhancement sheet, a backlight LED, and the like. Are integrated with a metal front frame 701 covering the peripheral edge of the display panel and a metal back frame 702 covering the back surface.

  In addition, a flexible printed wiring board extends from a substantially central portion of the short side portion of the display device unit 700. The flexible printed wiring board is inserted into a connector 820 provided on a main wiring board 800 described later, and is electrically connected. Connected to.

  The display device unit 700 is disposed at a position surrounded by the standing wall portions 310, 320, 330, and 340 provided on the outer peripheral edge of the chassis 300, and comes into contact with the standing wall 310 and the standing wall 320 when assembled. The adhesive is fixed to the chassis 300 with the double-sided tape 350.

  The standing wall portions 310 to 340 are formed so that their respective front end portions are in contact with the inner wall portion of the rear cover 201 and are slightly higher (higher than the thickness) of the display device unit 700. Thus, the external force is transmitted to the chassis 300 instead of the display device unit 700 by acting as a column that receives the external force applied to the rear cover 201.

  The main wiring board 800 is mounted with a CPU, a memory, an image processing LSI, and a power supply circuit, and a memory card slot for storing an external memory for storing video and audio, and a USB connector.

  The connector 810 includes a rear operation system flexible printed wiring board 602, the connector 820 includes a display unit 700, and the connector 830 includes a flexible printed wiring board 906 that connects a strobe wiring board 902 described later. The upper surface operation system flexible printed wiring board 151 is connected to 840.

  The main wiring board 800 is positioned with respect to the battery chamber 500 by fitting the holes 800 a and 800 b provided for positioning with the convex portions 500 c and 500 b formed in the battery chamber 500.

  The flash light emitting device unit 900 is roughly divided into a flash light emitting unit 901 and a strobe wiring board 902.

  The flash light emitting unit 901 is pivotally supported with respect to the base member 903, and the inside includes a light emitting tube, a reflective shade, a trigger coil, a strobe light emitting window, and the like.

  The strobe wiring board 902 is mounted with a strobe circuit such as a strobe electric component which is an electronic component for causing the flash light emitting unit 901 to emit light, and a main capacitor 904 is connected with a lead wire.

  Note that the flash light emitting unit 901 and the strobe wiring board 902 are connected by a lead wire unit 905 to form an integrated flash light emitting device unit 900.

  Further, a not-shown convex portion provided for positioning at the lower portion of the base member 903 is fitted into holes 300 e and 300 f formed in the chassis 300, thereby positioning with respect to the chassis 300.

  Further, since the flash light emitting unit 901 irradiates the photographing range of the photographing lens of the barrel unit 400, it is necessary to maintain the positional relationship with the optical axis. Therefore, it is desirable that the flash light emitting unit 901 is positioned and attached to a surface parallel to the surface to which the lens barrel unit 400 is attached and perpendicular to the optical axis.

  Next, the flash light emitting device unit 900 will be further described with reference to FIG.

  FIG. 8 is a view of the flash light emitting device unit 900 as viewed from above.

  In FIG. 8, reference numeral 901 denotes a flash light emitting unit, and 902 denotes a strobe wiring board, which are connected by a lead wire unit 905, and the flash light emitting part 901 and the strobe wiring board 902 are integrated. A main capacitor 904 is connected to the strobe wiring board 902 by a lead wire, and a flexible printed wiring board 906 is connected by soldering at a solder portion 907.

  One end of the flexible printed wiring board 906 is provided with a connecting portion 906a. After being assembled to the main unit 1000, the flexible printed wiring board 906 is inserted into a connector 830 (FIG. 7) mounted on the main wiring board 800. The flashlight unit 900 is electrically connected.

  Further, at a position different from the connection portion 906a of the flexible printed wiring board 906, an extension portion 906b extending in the same direction as the extension direction of the connection portion 906a is provided.

  As described above, the main unit 1000 includes the chassis 300, the lens barrel unit 400, the battery chamber unit 500, the back operation system unit 600, the display device unit 700, the main wiring board 800, and the flash light emitting device unit 900. After each unit is assembled, the camera body 1 is assembled by incorporating the front cover unit 100 and the rear cover unit 200 in this order.

  Next, referring to FIG. 9 and FIG. 10, a time when the flash light emitting device unit 900 is assembled in the assembly of the main unit 1000 will be described.

  FIG. 9 is a perspective view of the main unit when the flash light emitting device unit is assembled, as viewed from the back side, and FIG.

  In FIG. 9, the barrel unit 400, the battery chamber unit 500, and the main wiring board 800 are incorporated in the chassis 300 when the flash light emitting device unit 900 is incorporated.

  Here, as described above, the flash light emitting device unit 900 is formed by fitting positioning protrusions (not shown) provided in the lower portion of the base member 903 into the holes 300e and 300f formed in the chassis 300. Are incorporated into the chassis 300.

  On the other hand, the strobe wiring board 902 is assembled by fitting holes 902a and 902b provided for positioning into convex portions 500d and 500e provided in the battery chamber 501.

  At this time, the strobe wiring board 902 and the main wiring board 800 attached to the back surface of the battery chamber 501 prevent interference between components due to tolerance variation of each outer shape and short-circuiting due to the interference as shown in FIG. In addition, the battery chamber 501 is positioned with a predetermined gap D therebetween.

  The main capacitor 904 is bonded and fixed to the front surface of the battery chamber 501 with a double-sided tape.

  When the flash light emitting device unit 900 is incorporated in the main unit 1000, the connection portion 906a provided on the flexible printed wiring board 906 on the strobe wiring board 902 is connected to the connector provided on the main wiring board 800 as described above. 830 is connected.

  At this time, the extending portion 906b provided on the flexible printed circuit board 906 extends in the back direction of the main unit 1000 as shown in FIG. 10, and a predetermined gap D generated by the main circuit board 800 and the strobe circuit board 902 is obtained. Is arranged to bridge.

  After the flash light emitting device unit 900 is assembled, the display device unit 700 and the rear operation system unit 600 are assembled to the main unit 1000, and the front cover unit 100 is sequentially assembled to the main unit 1000.

  Next, referring to FIG. 11, a state in which the front cover unit 100 is assembled into the main unit 1000 will be described.

  As shown in FIG. 11, the front cover unit 100 is assembled into the main unit 1000 from the front while passing the lens barrel unit 400 through the opening 110 provided in the front cover 101.

  Therefore, the connection portion 151 a provided at one end of the upper surface operation type flexible printed wiring board 151 attached to the front cover 101 is incorporated while passing through the upper part of the main unit 1000 and is placed around the back surface of the main unit 1000. Thus, it is inserted into the connector 840 mounted on the main wiring board 800.

  That is, the connection portion 151 a provided at one end of the upper surface operation system flexible printed wiring board 151 attached to the front cover 101 is a flexible printing provided on the strobe wiring board 902 disposed on the upper part of the battery chamber unit 500. It is incorporated while passing over the wiring board 906.

  Here, attention is paid to the assembly path of the connecting portion 151a provided at one end of the upper surface operation system flexible printed wiring board 151 attached to the front cover 101 when the front cover unit 100 is assembled.

  FIG. 12 is a view of the front cover unit 100 as viewed from above when the front cover unit 100 is assembled into the main unit 1000.

  As shown in FIG. 12, when the front cover unit 100 is assembled into the main unit 1000, the extending portion 906 b provided on the flexible printed wiring board 906 on the strobe wiring board 902 is formed by the main wiring board 800 and the strobe wiring board 902. It arrange | positions in the state which bridges the predetermined gap D which produced.

  In this state, the connecting portion 151a provided at one end of the upper surface operation system flexible printed wiring board 151 attached to the front cover 101 is incorporated from the front of the main unit 1000 and moves straight along the broken line arrow while moving substantially straight. It reaches the back surface of 1000 and is inserted into a connector 840 provided on the main wiring board 800.

  At this time, the extending portion 906b provided on the flexible printed wiring board 906 on the strobe wiring board 902 is disposed so as to bridge the predetermined gap D, and is mounted on the front cover 101. It arrange | positions so that it may be located on the passage route (dashed arrow) of the connection part 151a provided in the end of 151. FIG.

  With this configuration, the connecting portion 151a provided at one end of the upper surface operation system flexible printed wiring board 151 is not inserted into the predetermined gap D in the process of assembling the front cover unit 100, and the rear surface of the main unit 1000 is Can be reached.

  Further, as shown in FIG. 13, the extending portion 906 c may be further arranged so as to be positioned opposite to the extending direction of the extending portion 906 b provided on the flexible printed wiring board 906 on the strobe wiring board 902. . Here, the extending portion 906c is preferably bent toward the lower portion of the main unit 1000 as shown in FIG.

  In this way, the connection portion 151a provided at one end of the upper surface operation type flexible printed wiring board 151 attached to the front cover 101 becomes an invitation when starting to pass through the upper part of the main unit 1000, and the upper surface operation system flexible print A series of processes from passing through the upper part of the main unit 1000 to the back of the main unit 1000 of the connection part 151a provided at one end of the wiring board 151 can be performed more smoothly.

  With the configuration described above, even when the upper surface operation type flexible printed wiring board 151 is integrally formed with the front cover 101, the connection provided at one end of the upper surface operation type flexible printed wiring board 151 is provided. The assemblability of the part 151a can be improved.

  The present invention is not limited to the above-described embodiment, and it is needless to say that other various configurations can be adopted without departing from the gist of the present invention.

100 Front cover unit 151 Upper surface operation system flexible printed wiring board 151a connection section 800 main wiring board 900 Flash light emitting device unit 902 Strobe wiring board 906 flexible printed wiring board 906a connection section 906b extending section 906c extending section D predetermined gap 1000 main unit

Claims (1)

A board (800) on which electronic components are mounted and arranged with a predetermined distance (D) from members constituting the imaging device;
A first connecting member (906) comprising a first connecting portion (906a) connected to the substrate (800);
After the first connection portion (906a) is connected to the substrate (800), a second connection member (151) including a second connection portion (151a) connected to the substrate (800).
In an imaging apparatus comprising:
The first connecting member (906) includes at least one extending portion (906b, 906c) extending from a position different from the first connecting portion (906a) connected to the substrate (800), Of the extending portions (906b, 906c), at least one of the extending portions (906b) is disposed so as to bridge the predetermined distance (D) and is provided on the second connecting member (151). Further, the image pickup apparatus is configured such that the second connection portion (151a) is incorporated so as to pass over the extending portions (906b, 906c).