JP2006186157A - Assembling structure of electronic appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling structure of an electronic appliance wherein any new component is not required, and the attaching of its wiring board to its chassis is made possible by simple working processes, and further, any screw is not required to attach its wiring board and its cover to its chassis, and moreover, its assembling and its disassembling can be performed easily. <P>SOLUTION: In the assembling structure of an electronic appliance, a wiring board 24 is inserted into a chassis 32 from the upper side of the chassis 32, and the wiring board 24 is brought into such a state that the upper and lower presser pieces of the chassis 32 sandwich it between them from its upper and lower sides, and further, the wiring board 24 is held in the intermediate position of the chassis 32. Consequently, the interactive insulating property and heat radiating property (ventilating property) of electronic components 23 can be so secured as not to require also the increase of the number of necessary components and tools for assembling the electronic appliance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device assembly structure for attaching a wiring board to a metal chassis and covering with a cover.

  Electronic devices such as label printers, automatic stickers such as labels and labels, label winders, and seal peelers are configured by housing a wiring board on which an integrated circuit such as a microcomputer is mounted in a casing. The casing is configured by combining a chassis and a cover, and the wiring board is attached to the chassis by screws or the like.

  FIG. 6 is a cross-sectional view for explaining a typical prior art mounting structure. The housing 1 is configured by combining a chassis 2 and a lid 3. The corner portion 4 of the chassis 2 is drawn by using a pressing die as shown in FIG. A screw hole 5 a is formed in the gantry 5, and a screw 9 inserted through an insertion hole 8 formed in the corner portion 6 of the wiring board 7 is screwed into the screw hole 5 a. In this way, the wiring board 7 holds the wiring pattern formed on the back surface 7 a and the terminal 10 a of the electronic component 10 protruding from the back surface 7 a without contacting the chassis 2.

  FIG. 8 is a cross-sectional view for explaining another conventional mounting structure. In this prior art, an insertion hole 13 is formed in the corner portion 14 of the chassis 12 constituting the housing 11, and a mounting screw 16 of the spacer 15 is inserted into the insertion hole 13. As shown in FIG. 9, the spacer 15 fixed to the chassis 12 is screwed into the screw hole 15 b with the screw 9 inserted through the insertion hole 8 of the wiring board 7, and the wiring board 7 is attached to the chassis 12. ing.

  And in patent document 1, in order to enable attachment of a wiring board to a chassis in a simple processing process without requiring a new part, a notch is formed at the same time as the punching formation of the chassis, A technique has been introduced in which a plurality of bent pieces are cut and raised near the corners of the chassis to provide screw holes for supporting the wiring board.

Japanese Utility Model Publication No. 5-69984

  However, even in the technique disclosed in Patent Document 1 described above, the mounting of the wiring board to the chassis and the mounting of the cover are performed using screws. Requires a wide variety of screws.

  For this reason, the number of parts and assembly man-hours increase at the time of an assembly, and there exists a problem that a screw is easy to lose at the time of disassembly, such as repair. When the electronic device is finally discarded, it is necessary to remove the screw and separate it into valuable metal and hazardous waste, and there is a problem that it takes time and effort to dismantle even at the time of disposal.

  The present invention has been made in view of the above-described problems of the prior art, and enables the wiring board to be attached to the chassis without requiring new parts and by simple processing, and the chassis of the wiring board. It is an object of the present invention to provide an assembly structure of an electronic device that can be easily assembled and disassembled without requiring screw tightening or caulking for attachment to a cover or cover.

  In order to solve the above problems, the structure of the electronic device assembly structure according to the present invention is characterized in that the upper and lower sides are arranged in pairs at the middle positions of the four side surfaces of the rectangular box-shaped metal chassis. Forming a U-shaped cut in a different direction, bending and bending the central metal piece toward the center of the chassis to form an upper holding piece and a lower holding piece with springiness, A wiring board is inserted into the center of the square box-shaped chassis, and the periphery of the wiring board is sandwiched and supported by the upper pressing piece and the lower pressing piece from above and below, and a convex part that engages with the notch on the side surface of the chassis. It is to cover with the provided cover.

  Further, the convex part can press at least one of the upper part and the pressing piece toward the center of the chassis in a state where the cover is applied.

  According to the said structure, it can hold | maintain in the intermediate | middle position of a chassis as the state pinched | interposed from the upper and lower sides with each upper pressing piece and the lower holding piece only by inserting the wiring board from the upper part of a chassis. Therefore, insulation between electronic components and heat dissipation (breathability) can be secured, and the number of parts and tools required for assembly do not need to be increased.

  On the other hand, when disassembling, the balance between the force between the upper pressing piece and the lower pressing piece is lost by simply elastically deforming one of the upper pressing pieces outwardly of the chassis, and the wiring board can be easily removed. .

  In addition, if the convex part of the cover presses at least one of the upper or lower pressing pieces toward the center of the chassis in the state where the cover is applied, the stress of deforming the wiring board into a bowl shape is alleviated. In addition, since at least one of the upper and lower pressing pieces expands toward the inside of the chassis, the area for supporting the substrate is expanded and a stable structure is obtained.

  According to the present invention, it is possible to omit the drilling process on the wiring board and the chassis, parts such as screws and spacers, the screw tightening process and the caulking process and the tool, and the design excellent in assemblability and recyclability (easiness of disassembly). Is possible.

Embodiments of the present invention will be described below.
FIG. 1 is an exploded perspective view for explaining an embodiment of the present invention. The wiring board 24 on which the electronic component 23 is mounted is housed in the housing 31. The casing 31 generally includes a rectangular box-shaped chassis 32 and a box-shaped cover 33, and is formed of a metal material such as iron or aluminum that can be plastically deformed. A cover 33 is applied to the chassis 32 to which the wiring board 24 is attached, and the protrusions 43 and 44 of the cover 33 are engaged with the notches 41 and 42 of the chassis 32 so as to be integrated.

  FIG. 2 is a development view of the chassis 32, and FIGS. 3 to 5 are explanatory views of a method of attaching and removing the wiring board to / from the chassis.

  In FIG. 2, the metal plate 34 to be the chassis 32 has a bent part indicated by a dotted line and a cut-off part indicated by a solid line. A pair of “U” -shaped cuts 41 and 42 are formed at different positions on the four side surfaces so as to form a set for each opposed surface. Then, in the state in which the rectangular box-shaped chassis 32 is formed, the upper pressing piece 45 imparted with a spring property by bending and bending the metal piece at the center of each of the notches 41 and 42 so as to face the center side of the chassis 32. And the lower pressing piece 46 is formed.

  Next, as shown in FIG. 1, the electronic device 31 is assembled. At this time, as shown in FIG. 3, the periphery of the wiring board 24 is sandwiched and supported by the upper pressing piece 45 and the lower pressing piece 46 from above and below. And it becomes a structure where the convex parts 43 and 44 of the cover 33 are engaged with each notch part 41 and 42 of the chassis 32 side surface, and it covers.

  Here, since the convex portion 43 presses the upper pressing piece 45 toward the center of the chassis 32 in the state where the cover 33 is applied, it is possible to alleviate the saddle-shaped distortion deformation applied to the wiring board 24. The portion that supports the wiring board 24 can be enlarged.

On the other hand, in order to take out the wiring board 24 from the chassis 32, as shown in FIG. 4, one of the upper pressing pieces 45 is elastically deformed outward of the chassis 32, so The wiring board 24 can be easily removed (FIG. 5).

As described above, according to the present invention, it is possible to omit the drilling process for wiring boards and chassis, parts such as screws and spacers, screw tightening process, caulking process and tools, etc., and assembling and recyclability (easy to disassemble) This makes it possible to design excellently.

In addition, what was shown in the said embodiment is an illustration to the last, and is not limitation. Needless to say, the embodiments can be freely modified within the scope of the claims.

It is a whole perspective view for demonstrating the assembly structure of the electronic device of this invention. It is an expanded view of a chassis. It is an expanded sectional view which shows the fixing | fixed part of a chassis, a wiring board, and a cover. It is explanatory drawing which shows the removal method of a wiring board. It is explanatory drawing which shows the removal method of a wiring board. It is sectional drawing which shows the structure which attaches the wiring board of the electronic device by a prior art to a chassis. It is an expansion perspective view which shows the principal part of FIG. It is sectional drawing which shows the attachment structure of the wiring board and chassis of an electronic device by another prior art. It is an expansion perspective view which shows the principal part of FIG.

Explanation of symbols

24 ... Wiring board, 32 ... Chassis, 33 ... Cover, 41, 42 ... Cut, 43, 44 ... Projection, 45 ... Upper pressing piece, 46 ... Lower pressing piece

Claims (2)

  In the middle position of the four sides of the rectangular box-shaped metal chassis, a “U” -shaped cut is formed in a different shape so that each pair faces each other. Forming an upper presser piece and a lower presser piece that are bent and deformed toward the end to provide spring properties, inserting a wiring board into the center of the square box-shaped chassis, and An assembly structure of an electronic apparatus, wherein the periphery of the wiring board is sandwiched and supported from above and below, and the cover is covered with a cover provided with a convex portion that engages with the cut portion on the side surface of the chassis. The electronic device assembly structure according to claim 1, wherein the convex portion presses at least one of the upper and lower pressing pieces toward the center of the chassis when the cover is applied.

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