JP2739114B2 - Backboard fixing structure for electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a back board fixing structure for introducing a terminal line in an electronic device for a communication line and connecting signals between packages mounted in the electronic device. With the aim of providing a new fixing structure with a high degree of freedom in design that also serves as reinforcement, a number of units consisting of printed circuit boards on which electronic components are mounted are housed inside the housing along the rail members, and each unit The signal connection between them is made via a common backboard attached to the back of the housing, while the introduction of terminal lines is made via a sub-board installed parallel to this on the back of the backboard. In the electronic device configured in
A horizontal reinforcing member extending horizontally across the entire width is interposed between upper and lower edges of the two boards facing each other, and a spacer of a predetermined thickness extending in a vertical direction is provided between areas of the two boards facing each other. A state in which protrusions provided on upper and lower portions of the spacer are engaged with horizontal guide grooves provided in a front wall of a rib extending over the entire width in the length direction of the horizontal reinforcing member. Then, a screw is inserted from the sub-board side through the sub-board, the spacer and the back board, and a tip of the screw protruding forward from the back board is screwed into a screw hole provided in a base of the rail member. Each of these members is tightened and fixed to each other.

[Industrial applications]

The present invention relates to a back board fixing structure for introducing a terminal line in an electronic device for a communication line and connecting signals between packages mounted in the electronic device.

[Conventional technology]

As shown in FIG. 7, an electronic device 1 for a communication line used for transmitting various types of information is configured by housing a large number of units 2 each formed of a printed circuit board on which electronic components are mounted in a housing in parallel. Have been. Each unit 2 is mounted and fixed via a plug-in connector 6 (FIG. 8) to a number of contact pins 5 protruding from the inner surface of a back board 4 provided on the back of the housing 3. An external terminal line connected to this apparatus is connected via an interface connector 7 also installed on the outer surface of the backboard 4 and is generally introduced into each unit 2 through wiring inside the backboard 4. Method. Recently, the miniaturization of electronic components has advanced, and high-density mounting has become possible. As a result, devices have become smaller and more capable of processing. As a result, the number of terminal lines introduced into one device increases, and accordingly, the space for installing the interface connector 7 becomes insufficient, and plugs for connecting each unit to the backboard are reduced. The number of pins of the in-connector has also increased, and the force required for inserting and removing the unit has increased.

As a solution to this problem, as shown in FIG. 8, the present inventors provided a sub-board 4b of substantially the same shape and size as the back board 4a of the conventional back board 4a in parallel with the back board 4a. The line 11 is received by the interface connector 7 installed on the sub-board 4b, and the original back board 4a is exclusively used for signal connection to each unit 2 housed in the housing. 125451).

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a new fixing structure having a high degree of freedom in design that also serves as reinforcement of a backboard in the above-described new system.

[Means for solving the problem]

The purpose of this is to house a number of units consisting of printed circuit boards on which electronic components are mounted inside the housing along the rail members, and to connect the signals between each unit to a common backboard attached to the back of the housing. On the other hand, in an electronic device configured to introduce a terminal line via a sub-board installed in parallel with the back of the back board, a terminal line is introduced between upper and lower edges of both boards facing each other. To
A horizontal reinforcing member extending in the horizontal direction over the entire width is interposed, and a spacer having a predetermined thickness extending in the vertical direction is interposed between the regions facing each other on both boards. Penetrate the sub-board, the spacer, and the back board in a state where the protrusions provided on the upper and lower portions of the spacer are engaged with the horizontal guide grooves provided on the front wall of the rib extending over the entire width of the rib. Then, screws are inserted from the subboard side, and the tips of the screws protruding forward from the backboard are screwed into screw holes provided at the base of the rail member, and these members are mutually fastened and fixed. This is achieved by a fixing structure of the backboard characterized by the following.

(Operation)

The backboard and the subboard are penetrated by screws with a spacer and a horizontal reinforcing member interposed therebetween,
It is fastened to the screw hole of the rail member. The protrusion of the spacer enters the guide groove of the horizontal reinforcing member to fix the relative position between them. Thereby, both boards are firmly integrated in a box shape, and the rigidity is improved.

If the screw is loosened, the spacer can move along the guide groove of the horizontal reinforcing member, so that the mounting position of the rail member, that is, the housing position of the unit can be arbitrarily set, and rationalization at the design stage becomes possible.

Hereinafter, the present invention will be described in more detail based on preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 is an exploded perspective view of a fixed structure of a backboard according to the present invention. A terminal line of the same shape and size is provided on the back side of a backboard 4a for signal connection between units (not shown). The introduction sub-board 4b is arranged.

A horizontal reinforcing member 12 is provided between the two along the upper and lower edges facing each other over the entire width thereof. However, only the lower horizontal reinforcing member is shown in the figure, and the upper one is omitted. The horizontal reinforcing member 12 is
And a rib 14 protruding therefrom, and a guide groove 15 having a substantially triangular cross section is provided in the front wall of the rib 14 in the horizontal direction over the front width. Both boards 4a, 4b
Are mounted on the front and rear regions of the plate portion 13 with the ribs 14 interposed therebetween.

A plug-in connector 6 is provided at a predetermined position on the back board 4a.
A rail member 16 for unit introduction, which is integrated with the housing 10 for mounting the unit, is provided. The housing 10 is provided with a hole 17 which is press-fitted into the backboard 4a, is implanted, and engages with the contact pin 8 which projects forward and backward, and a screw hole 18 is provided at the base of the rail member 16. I have.

In the area corresponding to the mounting position of the rail member 16,
A vertical spacer 19 extending between the plate portions 13 of the upper and lower horizontal reinforcing members 12 is disposed. This spacer 19
The upper and lower ends of a main body made of resin and having a constant thickness d form thin projections 20 having a special shape and a thickness, and the cuts 21 are formed here.
Is provided. Then, as shown in FIG. 2, the projection 20 is positioned with the back side having an arc-shaped cross section engaged with the guide groove 15 of the horizontal reinforcing member. To elaborate,
The rear wall 14a of the rib 14 is perpendicular to the back board 4a, and the front face 19a of the spacer 19 is also vertical and the sub board 4b
It is configured to be in close contact with. On the other hand, the front end of the projection 20 projects slightly forward by δ from the front surface 19a, and when these members are jointly fastened by the screw 21 as described later, this portion is elastically deformed, thereby fixing force. Has the effect of being enhanced.

Each member arranged in a predetermined position in this way is penetrated by the screw 22 from the sub-board 4b side, and the tip protruding toward the back board 4a through the slit 21 of the spacer 19 is formed by the rail member 16. It is screwed into the screw hole 18 and tightened. Note that the back board 4a
The sub board 4b is provided with holes 23 at predetermined positions, and the spacers 19 are provided with holes 24 for receiving the contact pins 8 of the back board 4a.

FIG. 3 shows a state in which the members are tightened together by the screws 22 in this manner.

〔The invention's effect〕

According to the backboard fixing structure of the present invention configured as described above, the following effects can be obtained.

1) Since both boards 4a and 4b are firmly fixed to the box shape by screws 22 via a plurality of spacers, they are structurally strong without any special reinforcing means.

2) Since the spacer 19 can be positioned at any position by sliding in the width direction of the backboard 4a along the guide groove 15 of the horizontal reinforcing member 12, the corresponding rail member 16 can also be set arbitrarily. . As a result, the rail member, which had previously required the mounting position to be determined by sheet metal processing or the like, can be easily fixed at an arbitrary position only by processing the holes 23 for both boards, and the responsiveness can be increased as necessary. A rich design becomes possible.

3) Rail member 16 is integrated with connector housing 10,
Since this is directly mounted in the hole of the back board 4a, high accuracy of the fitting dimension of the unit is guaranteed.

[Other embodiments]

5 and 6 show an example in which the above-described basic fixing structure A as shown in FIG. 4 is modified and applied.

FIG. 5 shows an example in which a plurality of units 2 are stacked and accommodated in a housing. The horizontal reinforcing member 12 is fixed only to the upper and lower edges of both boards 4a and 4b, and is omitted in the intermediate region.

FIG. 6 shows a structure in which two spacers 19 are stacked and accommodated by a screw block 25 at the center in order to accommodate a unit 2 'having a large dimension in the height direction.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the structure of the backboard fixing structure of the present invention, FIG. 2 is a partially enlarged side view for explaining a state of fastening and fixing the same, and FIG. FIG. 4 is a side view of the first basic embodiment of the present invention, FIG. 5 is a side view of the second embodiment, and FIG. 6 is a side view of the third embodiment. FIG. 7 is a perspective view showing the external appearance of an electronic device having a conventional connector arrangement structure, and FIG. 8 is a side view showing a double-structured backboard to which the present invention is applied. DESCRIPTION OF SYMBOLS 1 ... Electronic device, 2 ... Unit, 3 ... Housing, 4a ... Back board, 4b ... Auxiliary board, 6 ... Plug-in connector, 7 ... Interface connector, 8 ... Contact pin, 10 ... ... connector housing, 12 ... horizontal reinforcing member, 13 ... plate, 14 ... rib, 15 ... guide groove, 16 ... rail member, 17 ... hole, 18 ... screw hole, 19 ... spacer 20 ... Projection, 21 ... Split, 22 ... Screw, 25 ... Screw block.

Continuation of the front page (72) Inventor Tomoyuki Hongo 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (56) References Japanese Utility Model Sho-56-115880 (JP, U) Japanese Utility Model Sho-62-152496 (JP, U) Japanese Utility Model Showa 61-195092 (JP, U)

Claims (3)

(57) [Claims] A large number of units (2) formed of a printed circuit board on which electronic components are mounted are housed in a housing along a rail member (16), and a signal connection between the units (2) is made in the housing. Through a common back board (4a) attached to the back, the introduction of the terminal line (11) is carried out by installing a sub board (4b) installed parallel to the back of the back board (4a). In the electronic device configured to perform the above-mentioned operations, a horizontal reinforcing member (12) extending in the horizontal direction over the entire width is interposed between upper and lower edges of both boards (4a, 4b) facing each other. A spacer (19) having a predetermined thickness extending in the vertical direction is interposed between the facing regions of 4a, 4b), and a rib extending over the entire width of the horizontal reinforcing member (12) in the longitudinal direction. In the horizontal guide groove (15) provided on the front wall of (14), Serial spacer (1
9) With the projections (20) provided on the upper and lower parts engaged, penetrate the sub board (4b), the spacer (19) and the back board (4a), and from the sub board (4b) side. A screw (22) is inserted, and the tip of the screw (22) protruding forward from the backboard (4b) is screwed into a screw hole (18) provided at the base of the rail member (16). A backboard fixing structure wherein members are fastened and fixed to each other. 2. The spacer (19) is formed by laminating a plurality of parts, and the rail members (16) are provided in a pair of upper and lower parts corresponding to each part.
2. The fixing structure according to claim 1, wherein (2) is provided so as to correspond only to the upper edge of the uppermost portion and the lower edge of the lowermost portion. 3. The fixing structure according to claim 1, wherein the spacer (19) is composed of a plurality of parts whose connection portions are fixed and integrated by a screw block (25).