JP2834934B2 - Electronic device housing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of an electronic device, and provides a structure of an electronic device which facilitates repair and inspection and reduces the number of fixing screws as much as possible.

[0002]

2. Description of the Related Art Generally, a top plate of an electronic device is provided with an insulating coating on both sides, and a method of grounding the top plate is as follows.
After partially removing the coating on the back surface, the top plate of the device is grounded by contacting a grounding fitting or the like. Also, when screwing a top plate with a U-shaped cross section to the chassis,
One side is fixed with at least two screws. Screws are also used to attach the bottom plate. In addition, as an effort to facilitate repair and inspection, a public utility model utility model No. 3-28550 (H05K7 / 1)
4). The technique disclosed in this publication has a configuration in which a part of a rear side surface of a chassis is cut out, and a terminal board attachment with a printed board is rotatably attached to the cutout part.

[0003]

In the above-mentioned prior art,
In order to ground the top plate, a step of peeling off the insulating coating on the back surface of the top plate is required, which causes a cost increase. In addition, there are many mounting screws for the bottom plate and the top plate, which is an obstacle to reducing the number of man-hours and responding to automation. In addition, attaching and detaching the terminal plate attachment requires two-step operation, which is complicated.

[0004]

Means for Solving the Problems (1) A grounding metal having a saw-toothed elastic tongue is connected to an edge ground pattern of a printed circuit board, and the elastic tongue is positioned and arranged on a chassis. At the time of attachment, the elastic tongue piece is configured to contact and rub against the top plate. (2) Form a flange protruding outward from the lower edge of the left and right side surfaces of the chassis, provide a predetermined number of long holes in the flange, and provide the top plate with a hanging tongue inserted into the long hole. (3) An elastic hook and an L-shaped engaging piece are provided on the bottom surface of the chassis, a mounting boss and a positioning protrusion are provided on a side surface of the chassis, and the flat bottom plate is opposed to the elastic hook and the L-shaped engaging piece. In addition to providing a through hole, a bent piece having a screw hole and a notch facing the boss and the projection is integrally formed.

(4) A chassis having a U-shaped bearing on the rear side and a locking hole on the left and right sides, a terminal plate mounting device rotatably mounted on the rear surface of the chassis (the mounting device is An elastic wall having a rotation shaft on one side edge and a protruding rib on the other side edge, and having an engagement projection is provided on both side edges.), And a skirt bent from a U-shaped cross-section edge It is constituted by a top plate having a portion. (5) An edge of a printed circuit board to which a shield case having a hole to be locked, which is separable and connected to one of the substrates, is held to the terminal plate mounting fixture by a jumper wire, and the shield case is sandwiched. The holding means and the locking claw are integrally formed.

[0006]

According to the above-described structure, the terminal plate mounting fixture holding and holding the edges of the plurality of printed circuit boards connected by the jumper wires and the shield case attached to one of the printed circuit boards is turned around the rear surface of the chassis. Mounted movably. In addition, the bottom plate is attached and held in place without using screws, and by attaching the top plate at the end, the top plate is grounded by the grounding metal, and the bottom plate is also fixed to the chassis by screwing. You.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view, FIG. 2 is an exploded perspective view and a partial cross-sectional view in a state where a grounding bracket is mounted, FIG. 3 is an external perspective view of a top plate and a chassis, FIG. 4 is an external perspective view of a bottom plate and a chassis, and FIG. FIG. 6 is an exploded perspective view of the mounting plate and the printed circuit board when the shield case is mounted.

In the figure, reference numeral 1 denotes a box-shaped resin chassis having an open upper surface, flange portions 3 and 3 protruding from left and right side surfaces 2 and 2, U-shaped bearings 4 and 4 on a rear side surface, and an elastic surface on a bottom surface. The hooks 5, 5 and the L-shaped engaging pieces 6, 6, ... are integrally formed. On one side 2 is a mounting boss 7 for screwing.
In addition, a positioning projection 8 is provided near the boss 7. 2a is a locking hole, and 3a is a long hole (FIG. 4).
reference). Reference numeral 9 denotes a metal top plate having a U-shaped cross section and coated on both sides with an insulating coating. A skirt portion 10 and a hanging tongue piece 12 bent from the edge are integrally formed (FIG. 3).
reference). 13 is a screw hole for attachment.

Reference numeral 15 denotes a metal flat bottom plate, which is a bent piece 1 having a plurality of through holes 15a, screw holes 16, and notches 17.
8 are integrally formed. 19 is a triangular pointed projection provided on the periphery of the screw hole 16 (see FIG. 4). 2
Reference numeral 0 denotes a terminal plate attachment, which is a resilient wall 2 having a pivot 21 on the lower edge, a rib 22 protruding on the other side edge, and an engagement projection 23
4 are integrally formed. Further, on one elastic wall 24, a locking claw 25 is formed on the inside, and an elastic claw 26, substrate holding means 27, 28, 29 and the like are integrally formed facing the locking claw 25. Reference numeral 30 denotes a positioning projection (see FIG. 5).

Reference numeral 31 denotes a printed circuit board, which is a slit 3 for division.
The board 34,
35 are connected. 36 is a shield case, through holes 34a, 3 of the dimension L ₁ between the L-shaped mounting legs 37, 38 provided substantially in the middle portion of the shield case 36 substrate 34
Set eyes slightly smaller than the dimension L ₂ between 4b, by attaching the substrate assembly at the shield case 36 so as to widen somewhat, warping of the substrate during dipping soldering is prevented. The shield case 36 has a through hole 36.
a, 36b and 36c are provided (see FIG. 6). 3
Reference numeral 9 denotes a grounding metal, which is formed integrally with a saw-toothed elastic tongue 40, soldered to a printed circuit board 34, and engaged with the concave portion 22a of the terminal plate mounting member 20 (see FIG. 2).

Next, the assembly of the present invention will be described. As shown in FIG. 5B, after the printed circuit board 31 to which the dipping soldering is performed is divided at the slit 32,
5 is bent at 90 °, and the holding means 2 for the terminal plate fixture 20 is bent.
7 and 28, the substrate 34 is held, and the substrate 35 is
Hold at 9 and 29. At this time, the through hole 36c of the shield case 36 is positioned by the projection 30, and the through holes 36a and 36b engage with the locking claws 25 and the elastic claws 26, so that the shield case 36 is held.

Next, the rotation support shaft 21 of the terminal plate attachment 20
Is engaged with the U-shaped bearing 4 of the chassis 1 and the printed circuit boards 34 and 35 are rotated, the engaging projections 23 of the elastic wall 24 engage with the locking holes 2a of the chassis 1, and The attachment 20 is attached to the chassis 1. Elastic walls 24, 24
Are slightly displaced inward from each other, the engagement is released. If the substrate is rotated, the substrate portion can freely rotate within a range of 90 ° around the rotation support shaft 21.

Next, the through holes 15a, 15a,.
Is fitted into the L-shaped locking piece 6 on the back surface of the chassis 1, the bent piece 18 is inserted into the elongated hole 3a, and the bottom plate 15 is slid. As a result, the notch 17 engages with the positioning projection 8. , The screw hole 16 is positioned on the mounting boss 7. At this time, the elastic hook 5 engages with the through hole 15a to prevent the bottom plate 15 from moving (see FIG. 4). Finally, when the top plate 9 is put on, when the skirt portion 10 is put on the rib 22 of the terminal plate fixture 20, FIG.
As shown in FIG.
Contacts the insulating coating 14 coated on the back surface of the top plate 9 and rubs the coating 14. Thereby, the top plate 9
Is grounded via a grounding fitting 39.

The skirt portion 10 holds the protruding rib 22 on the side edge of the terminal plate mounting member 20 to securely attach the terminal plate mounting member 20 to the chassis 1. Hanging tongue piece 12 of top plate 9
Is inserted into the long holes 3a, 3a of the flange 3 of the chassis 1,
The positioning and holding of the side surface of the top plate 9 is performed. Therefore, the top plate 9
Is sufficiently fixed with one screw on each of the left and right sides. At this time, the pointed projection 19 provided on the peripheral edge of the screw hole 16 of the bottom plate 15 breaks through the coating 14 on the back surface of the top plate 9 and comes into contact with the metal part, so that the bottom plate 15 is also grounded.

[0015]

As described above, grounding of the top plate or the like with an insulating coating can be realized with a simple configuration. Also,
Since the assembly structure is configured with a minimum number of screws, the number of work steps can be significantly reduced, and the assembly can be easily automated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is an exploded perspective view and a partial cross-sectional view of the mounting of the grounding bracket of the present invention.

FIG. 3 is an external perspective view of a top plate and a chassis of the present invention.

FIG. 4 is an external perspective view of a bottom plate and a chassis of the present invention.

FIG. 5 is an external perspective view of the terminal board fixture of the present invention and a printed circuit board.

FIG. 6 is an external perspective view when a shield case is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box-type chassis 3 Flange part 4 Bearing 9 Top plate 12 Hanging tongue piece 15 Bottom plate 18 Folding piece 20 Terminal board mounting tool 21 Rotating support shaft 24 Elastic wall 39 Earth metal fitting 40 Serrated tongue piece

Claims (8)

(57) [Claims] 1. A resin box chassis having an open upper surface, a metal top plate having a U-shaped cross section and an insulating coating on both sides, an electric component is soldered, and a grounding metal is provided on an edge. A housing structure for an electronic device, comprising: a printed circuit board attached; and a sawtooth-shaped elastic tongue which is in contact with and rubs against the top plate when the top plate is attached. 2. A housing structure for an electronic device according to claim 1, wherein said elastic tongue is engaged and positioned with said chassis. 3. A resin box chassis having an upper surface opened and a flange protruding outward from lower edges of the left and right sides, a plurality of hanging tongue pieces having a U-shaped cross section from the lower edges of the left and right sides. Characterized by a metal top plate provided with a base plate, and a metal flat bottom plate, wherein the flange portion is provided with an elongated hole into which the hanging tongue piece is inserted. . 4. A plurality of elastic hooks and outwardly projecting L-shaped locking pieces are provided on a bottom surface of the chassis, and a boss is provided on a side surface and a positioning protrusion is provided near the boss, respectively. A through hole facing the elastic hook and the L-shaped locking piece of the chassis is provided, and a bent piece having a notch and a screw hole facing the boss and the projection is integrally formed. 3. The housing structure of the electronic device of 3. 5. The assembly structure for an electronic device according to claim 4, wherein a plurality of pointed protrusions protruding outward are provided on a peripheral edge of said screw hole. 6. A resin box-type chassis having an upper surface and a rear side surface opened, a U-shaped bearing on the rear side surface portion and locking holes on left and right side surfaces, and a rotation support shaft on a lower edge. A resilient wall having projection ribs on the other side edges and having engagement projections on the left and right side edges to engage with the locking holes, respectively, and a rotatable terminal plate fixture for closing a rear surface of the chassis. And a metal top plate having a U-shaped cross-section covering the chassis and having a skirt portion bent from the U-shaped edge. 7. A terminal board mounting fixture which is orthogonal to a plane thereof and
The board holding means protrudes in two directions parallel to the edge, and a locking claw is provided on the elastic wall, and the elastic claw and the positioning protrusion opposed to the locking claw are provided on the terminal plate fixture, respectively. By fitting the edge of the printed circuit board to the holding means, the hole of the shield case attached to the printed circuit board is fitted and positioned in the convex portion, and the locking claw and the elastic claw are used. 7. The electronic device housing structure according to claim 6, wherein said shield case is sandwiched. 8. The printed circuit board includes a plurality of boards formed so as to be divided and connected by a jumper wire, a power circuit component is soldered to one of the boards, and a shield case is provided in the power circuit section. The housing structure for an electronic device according to claim 7, wherein the printed circuit board is attached, and the printed circuit board is bent and divided and attached to the terminal plate attachment.