JPH0864978A - Electronic device housing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Concerning the housing structure of an electronic device that accommodates a printed wiring board, there is little occurrence or reception of noise in the ground connection path between the printed wiring board and the housing, An object of the present invention is to prevent the mounted indicator light from being damaged, to easily confirm the lighting state of the indicator light, and to have a good appearance of the housing. [Structure] A plurality of support pieces 15 formed by partially extending left and right bottom plate side plates 11 of a case bottom plate 10 having tip seats 15A for supporting the ground pad portion on the back surface of the printed wiring board 1 at their respective tips. And a plurality of holding pieces 25 formed by extending downward a part of the upper edge member 22 of the front cover 20 having a tip seat 25A for seating on the ground pad portion on the surface of the printed wiring board 1 at each tip. And a plurality of pressing pieces 35 formed by extending a part of an upper edge member 32 of the rear cover 30 having a tip seat 35A for seating on a ground pad portion on the surface of the printed wiring board 1 at the tip of To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure for an electronic device that houses a printed wiring board.

[0002]

2. Description of the Related Art A conventional housing structure of an electronic device is shown in FIG. In the figure, reference numeral 1 is a printed wiring board in which predetermined components are mounted to form a circuit.

Along the front edge of the printed wiring board, for example, L
An indicator light 2 such as an ED is mounted in parallel. An optical connector and other electrical connectors 3 are mounted on the rear side edge of the printed wiring board 1.

Further, ground pads 1A are provided at the four corners of the printed wiring board 1, respectively, and a hole into which the shaft portion of the machine screw 18A is fitted is provided at the center of each ground pad 1A. The casing made of a metal plate (for example, a steel plate) that accommodates the printed wiring board 1 has a case bottom plate 5 having a pair of left and right bottom plate side plates 5A, and a front cover 6 fitted to the front side of the case bottom plate 5. Rear cover 7 fitted to the rear surface side of the case bottom plate 5
And a pair of left and right upper cover side plates 8A and an upper cover 8 that covers the upper and side surfaces of the case bottom plate 5.

More specifically, at the four corners of the case bottom plate 5, spacing pillars 9 are vertically provided corresponding to the respective ground pads 1A of the printed wiring board 1, and machine screws 13 for fixing the upper cover 8 to the bottom plate side plate 5A. Is provided with a screw hole for screwing.

Further, the case bottom plate 5 is provided with a screw hole into which a shaft portion of a small screw for screwing the case bottom plate 5, the front cover 6 and the rear cover 7 is fitted. The front cover 6 has a shallow box shape including a front cover main plate and a pair of side edge members, upper edge members, and lower edge members provided by bending four sides of the front cover main plate.

The front cover main plate is provided with rectangular windows 6A corresponding to the respective indicator lights 2, and further provided with a switch window 6B in which the operation portion of the switch mounted on the printed wiring board 1 appears. .

The lower edge member of the front cover 6 (not shown)
Is provided with an auxiliary plate portion (two screw holes are provided) extending to the case bottom plate 5 side. The rear cover 7 has a shallow box shape including a rear cover main plate and a pair of side edge members, upper edge members, and lower edge members provided by bending four sides of the rear cover main plate.

A rectangular window corresponding to the connector 3 is arranged on the rear cover main plate. In addition, an auxiliary plate portion extending to the case bottom plate 5 side is provided on the lower edge member (not shown) of the rear cover 7.
7D is provided, and two screw holes are provided in this auxiliary plate portion 7D.

Further, the front cover 6 and the rear cover 7 are formed by bending four sides of the cover main plate to provide side edge members, upper edge members and lower edge members, and then welding a corner gap caused by the bending. The welded part is chamfered by polishing.

The upper covers 8 are side plates 8A of the respective upper covers.
And a screw hole into which the shaft portion of the machine screw 13 for fixing the upper cover 8 to the case bottom plate 5 is fitted.

The printed wiring board 1 is placed on the spacing pillars 9 so that the ground pads 1A on the rear surface are aligned with the upper end surfaces of the spacing pillars 9 provided at the four corners of the case bottom plate 5, and the ground pads 1A are placed.
Insert the small screw 18A into the hole of the space pillar 9, and screw the small screw 18A into the screw hole of the spacing pillar 9 (the screw hole provided in the axial center of the spacing pillar 9) to fix the printed wiring board 1 to the case bottom plate 5. ing.

Then, the lower edge member of the front cover 6 and the auxiliary plate portion sandwich the case bottom plate 5, and the left and right side edge members are in close contact with the outer surface of the bottom plate side plate 5A of the case bottom plate 5 so that the front cover 6 is in close contact with the outer surface.
Is fitted to the case bottom plate 5, and the auxiliary plate portion of the front cover 6 and the case bottom plate 5 are fixed to each other with machine screws.

The lower edge member of the rear cover 7 and the auxiliary plate portion 7D
And the case bottom plate 5 are sandwiched between the rear cover 7 and the left and right side edge members so as to be in close contact with the outer surface of the bottom plate side plate 5A of the case bottom plate 5.
Is fitted to the case bottom plate 5, and the auxiliary plate portion 7D of the rear cover 7 and the case bottom plate 5 are fixed to each other with machine screws.

On the other hand, the upper cover 8 is fitted on the case bottom plate 5 so that the upper cover side plate 8A of the upper cover 8 is close to the outside of the bottom plate side plate 5A and bridges and covers the front cover 6 and the rear cover 7. The upper cover side plate 8A and the bottom plate side plate 5A are fixed to each other using machine screws 13.

Since the housing for accommodating the printed wiring board 1 is configured as described above, the indicator lamp 2 is installed in the window of the front cover 6.
Located in a location corresponding to 6A. Therefore, the lighting state of the indicator lamp 2 can be confirmed on the front surface of the housing.

When the front cover and the rear cover are manufactured by drawing, not only the structure of the drawing die is complicated, but also wrinkles are generated at the corners and the appearance is unsightly. Therefore, conventionally, a bending process is performed and the corner gaps at the corners are welded.

[0018]

By the way, in the above-mentioned conventional housing structure, the ground connection between the printed wiring board and the housing is made through the spacers provided on the case bottom plate, and the ground path length is long. As a result, the spacers have an antenna function, which causes a problem that noise is generated or noise is received from the outside.

On the other hand, in order to make it easier to confirm the lighting state of the indicator lamp, the front cover is designed so that the head of the indicator lamp is close to the window of the front cover. Further, since the housing is manufactured by processing a metal plate, it is difficult for the mounting position of the front cover and the fixing position of the printed wiring board to coincide with the design values due to manufacturing errors.

For this reason, when the front cover is assembled into the bottom plate of the case, the peripheral portion of the window touches the head portion of the indicator lamp and the lead of the indicator lamp is bent, or the head portion of the indicator lamp comes off from the window. There is a problem that it is difficult to confirm the lighting state of the indicator lamp.

Further, since the front cover and the rear cover are formed by bending a metal plate, filling the gaps between the corners by welding, and further by hand-finishing, there is a problem that the appearance is poor.

The present invention has been made in view of the above points, and is a housing of an electronic device in which noise is less likely to occur in the ground connection path between the printed wiring board and the housing, or noise is less likely to be received. It is intended to provide a structure.

Another object is to prevent damage to the indicator lamp and to easily confirm the lighting state of the indicator lamp.
And to provide a housing structure having a good appearance.

[0024]

In order to achieve the above object, the present invention is, as illustrated in FIG. 1, a case bottom plate 10 having a pair of left and right bottom plate side plates, and a case bottom plate 10 fitted on the front side thereof. Front cover 20, a rear cover 30 fitted on the rear surface side of the case bottom plate 10, and an upper cover 40 having a pair of left and right upper cover side plates and covering the upper and side surfaces of the case bottom plate 10, and the printed wiring board 1 In the housing structure of the electronic device that accommodates the parallel to the case bottom plate 10, each of the left and right bottom plate side plates 11 of the case bottom plate 10 has a tip seat 15A for supporting the back surface of the printed wiring board 1 at each tip. A part of the upper edge member 22 of the front cover 20 having a plurality of supporting pieces 15 extending upward and a tip seating 25A seated on the surface of the front side edge of the printed wiring board 1 at the tips thereof extends downward. Multiple presser pieces 25 and each A plurality of pressing pieces 35 each having a tip seat 35A for seating on the surface of the rear side edge of the printed wiring board 1 at the end thereof and a part of an upper edge member 32 of the rear cover 30 extending downward, and each pressing piece. 25, 35 tip seat 25A,
The shafts are fitted in the holes provided in the 35A and the holes provided in the printed wiring board 1, respectively, and the tip seats 15A of the respective support pieces 15 are seated.
And a plurality of machine screws 18 screwed into the screw holes provided in the.

The support piece 15 supports the printed wiring board 1 with the tip seat 15A being in close contact with the ground pad provided on the back surface of the printed wiring board 1. Each presser piece
The tip seats 25A and 35A of the seats 25 and 35 are seated on the ground pad 1A provided on the surface of the printed wiring board 1.

When the small screw 18 is tightened, the supporting piece 15 and the pressing pieces 25 and 35 sandwich and hold the printed wiring board 1. As illustrated in FIG. 3, the front cover 20 of the housing
The window 26 is perforated corresponding to the indicator light 2 mounted on the front side edge of the printed wiring board 1.

A flanged sleeve 50 made of an elastic material that fits into the window 26 is provided so that the flange 52 is located inside the front cover 20 and is composed of a tubular portion 51 and a flange 52. The flanged sleeve 50 has a through hole 53 in which the head side of the indicator lamp 2 expands.

As shown in FIG. 4, the front cover 20 of the housing is shown.
The window 26 is perforated corresponding to the indicator light 2 mounted on the front side edge of the printed wiring board 1. It consists of shaft 56 and brim 57,
A transparent body 55 with a collar made of an elastic material that fits into the window 26 is provided so that the collar 57 is inside the front cover 20.

In this transparent body 55 with a collar, a lens-like concave surface 57A is formed in the center of the collar 57 so that the head side of the indicator lamp 2 expands, and the head of the shaft portion 56 projects to the front of the front cover 20. The lens-shaped convex surface 56A is formed.

Alternatively, as illustrated in FIG. 1 and FIG. 5, the front cover 20 includes a front cover main plate 20A and an upper edge member 22 and a lower edge member provided by bending four sides of the front cover main plate 20A inward. 23, a shallow box shape composed of a pair of side edge members 21.

The rear cover 30 comprises a rear cover main plate 30A, and a shallow box composed of an upper edge member 32, a lower edge member 33, and a pair of side edge members 31, which are provided by bending the four sides of the rear cover main plate 30A inward. Form.

Each side edge member 21, 31 and upper edge member 22, 3
2 and the corner gap C between them and the respective side edge members 2
In the corner gap C between the 1,31 and the lower edge members 23,33,
Each of the outer peripheral surfaces is filled with an arc-shaped synthetic resin 60.

As illustrated in FIG. 6, the front cover 20 includes a front cover main plate 20A, an upper edge member 22, a lower edge member 23, and a pair of sides provided by bending the four sides of the front cover main plate 20A inward. A shallow box shape including the edge member 21.

The rear cover 30 is a shallow box composed of a rear cover main plate 30A and an upper edge member 32, a lower edge member 33, and a pair of side edge members 31 provided by bending the four sides of the rear cover main plate 30A inward. Form.

After that, the surface of the cover 30 is covered with a synthetic resin. The surface of the front cover 20 is made of synthetic resin.
The inner peripheral surface of the window 26 provided corresponding to the indicator light 2 mounted on the front side edge of the printed wiring board 1 and the peripheral edge of the window 26 on the inner side surface of the front cover 20 are covered with the synthetic resin 70. The synthetic resin 70 is provided with a through-hole for expanding the head side of the indicator lamp 2.

[0036]

According to the first aspect of the invention, the ground pad on the back surface side of the printed wiring board is directly connected to the support piece provided on the case bottom plate. Further, the ground pad on the front surface side of the printed wiring board is directly connected to the pressing piece provided on the front cover or the rear cover.

Since the supporting piece and the pressing piece are wide, they do not function as an antenna. Therefore, noise is not generated or received in the ground connection path between the printed wiring board and the housing.

According to the second aspect of the present invention, the elastic sleeve with the flange, which has the through hole with which the head side of the indicator lamp is widened, is fitted in the window. Therefore, when the head of the indicator lamp may come into contact with this sleeve with collar when the front cover is fitted to the bottom plate of the case, it is guided by the expansion hole and the axis of the indicator lamp head penetrates. Move in the direction that matches the axis of the hole.

Therefore, when the indicator lamp is designed to be close to the front cover, the indicator lamp is not damaged.
Further, since the axis of the head of the indicator lamp and the axis of the through hole of the sleeve with a flange are substantially aligned with each other, it is easy to confirm the lighting state of the indicator lamp.

According to the invention of claim 3, the light of the indicator lamp is
The lens-shaped concave surface advances in the axial direction of the flanged transparent body and is diffused in the axial section, so that the entire axial section emits light. At this time, the lens-like convex surface projects from the front surface of the front cover.

Therefore, it is possible to confirm the lighting of the indicator lamp not only from the front of the front cover but also from the side. Moreover, the indicator light is not damaged. In the invention of claim 4, the front cover and the rear cover are bent using a mold having a simple structure.

The corner gap created by the bending process is filled with a synthetic resin to close it. Therefore, the appearance is improved as compared with the conventional case that is finished by welding. Further, the color of the synthetic resin is different from that of the front cover and the rear cover. Alternatively, the surface of the synthetic resin is plated or painted in a color different from that of the front cover and the rear cover.

As a result, the corners are provided with an accelerator, and a preferable design can be obtained. The invention of claim 5 also has the same effect as that of claim 4.
Further, the front cover has the same effect as the collared sleeve without specially providing the collared sleeve.

[0044]

The present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same objects throughout the drawings.

FIG. 1 is a perspective view showing the present invention in a separated form,
2 is a sectional view of an embodiment of the present invention, FIG. 3 is a sectional view of an essential part of the invention of claim 2, and FIG. 4 is a sectional view of an essential part of the invention of claim 3.

FIG. 5 is a view of the invention of claim 4, (A) is a perspective view of a main part, (B) is a perspective view before corner gap treatment, (C) is a cross-sectional view of the main part, and FIG. 5 is a sectional view of an essential part of an embodiment of the invention of claim 5, and FIG. 7 is a perspective view of an embodiment of the invention of claim 5.

In the figure, reference numeral 1 is a printed wiring board in which predetermined components are mounted to form a circuit. Indicator lights 2 such as LEDs are mounted in parallel along the front side edge of the printed wiring board, and a side switch 4 is mounted on the indicator lights 2.

An optical connector and other electrical connectors 3 are mounted on the rear side edge of the printed wiring board 1. Further, ground pads 1A are provided on both the front and back surfaces of the four corners of the printed wiring board 1, and a hole into which the shaft portion of the machine screw 18A is fitted is provided at the center of each ground pad 1A.

The case made of a metal plate (for example, a steel plate) for housing the printed wiring board 1 is a case bottom plate 10 having a pair of left and right bottom plate side plates 11, and a front cover fitted to the front side of the case bottom plate 10. 20, a rear cover 30 fitted to the rear surface side of the case bottom plate 10, and an upper cover 40 having a pair of left and right upper cover side plates 41 and covering the upper and side surfaces of the case bottom plate 10.

The case bottom plate 10 includes the respective bottom plate side plates 11
A part of the front and rear of the base plate is extended upward to provide four support pieces 15, and the upper portions of the respective support pieces 15 are bent inward at right angles to form ground pads 1A formed on the back surface of the four corners of the printed wiring board 1. A tip seat 15A is provided on which part is seated.

A screw hole into which a small screw 18 for fixing the printed wiring board 1 is screwed is provided at the center of the tip seat 15A. An embossed inwardly protruding boss is provided along the front and rear edges of the case bottom plate 10, and the shaft portion of a small screw for fixing the front cover 20 or the rear cover 30 is fitted to the top of this boss. A hole 14 for a screw is formed.

Further, each bottom plate side plate 11 is provided with a screw hole into which a machine screw 13 for fixing the upper cover side plate 41 of the upper cover 40 is screwed. The front cover 20 is the front cover main plate 20A.
And a front cover main plate 20A having four sides bent to form an upper edge member 22, a lower edge member 23, and a pair of side edge members 21 in a shallow box shape.

The front cover main plate 20A is provided with a rectangular window 26 corresponding to each indicator light 2, and further provided with a switch window 27 in which the operating portion of the switch 4 mounted on the printed wiring board 1 appears. ing.

Horizontally extending the left and right ends of the upper edge member 22,
Further, it is bent downward at a right angle, and two pressing pieces 25 are provided. Then, the tip end of each pressing piece 25 is bent horizontally to provide a tip seat 25A for seating on the ground pad 1A provided on the surface of the front corner of the printed wiring board 1.

At the center of the tip seat 25A, there is a screw hole into which the shaft of the machine screw 18 is fitted. Further, on the upper side of the lower edge member 23, as shown in FIG. 2, an auxiliary plate member 24 protruding inside the housing is provided. The auxiliary plate member 24 has a screw hole facing the screw hole 14 of the case bottom plate 10.

When the front cover 20 is fitted to the case bottom plate 10 from the front, the auxiliary plate member 24 and the lower edge member 23 sandwich the front edge portion of the case bottom plate 10, and the left and right side edge members 21 are the bottom plate side plates. 11
The front cover 20 is configured so as to be in close contact with the outer surface of the.

The rear cover 30 includes a rear cover main plate 30A, an upper edge member 32, which is formed by bending four sides of the rear cover main plate 30A, a lower edge member 33, and a pair of side edge members 31. Is.

The rear cover main plate 30A is provided with square windows corresponding to the respective connectors 3. The left and right ends of the upper edge member 32 are horizontally extended and bent downward at a right angle to provide two pressing pieces 35. The tip end of each pressing piece 35 is bent horizontally to provide a tip seat 35A for seating on the ground pad 1A provided on the surface of the rear corner of the printed wiring board 1.

At the center of the tip seat 35A, there is a screw hole into which the shaft of the machine screw 18 is fitted. In addition, an auxiliary plate member 34 protruding inside the housing is provided on the upper side of the lower edge member 33. The auxiliary plate member 34 has screw holes 14 for the bottom plate 10 of the case.
A screw hole is provided facing to.

When the rear cover 30 is fitted to the case bottom plate 10 from the rear side, the auxiliary plate member 34 and the lower edge member 33 sandwich the rear edge portion of the case bottom plate 10, and the left and right side edge members 31 are the bottom plate side plates. 11
The rear cover 30 is configured so as to be in close contact with the outer surface of the.

The upper covers 40 are provided with respective upper cover side plates 41.
In addition, a ventilation hole 49 is provided. A portion of the upper cover side plate 41 overlapping the bottom plate side plate 11 is provided with an inwardly projecting boss formed by embossing, and a screw for inserting the shaft portion of the small screw 13 fixed to the case bottom plate 10 at the top of this boss. The hole 42 is drilled.

The front cover 20 and the rear cover 30 are box-shaped by bending the four sides of the cover main plate as described above and providing side edge members, upper edge members and lower edge members. Therefore, as shown in FIG. 1 and FIG.
There is a corner gap C between 21,31 and the upper edge members 22,32, and a corner gap C between each side edge member 21,31 and the lower edge members 23,33.

Each corner gap C is filled (preferably by molding) with synthetic resin 60 having an arcuate outer peripheral surface to fill the corner gap.
The appearances of the front cover 20 and the rear cover 30 are adjusted.

At this time, in the corner gap portions of the side edge member, the upper edge member and the lower edge member, as shown in FIG. 5, cuts Cd are provided, and then synthetic resin 60 is molded and filled. Then, the synthetic resin 60 does not fall off, which is desirable.

The synthetic resin 60 is plated or painted in the same color as that of the front cover or the like to further improve the appearance. Further, the color of the synthetic resin 60 is different from that of the front cover and the rear cover. Alternatively, by plating or painting the surface of the synthetic resin with a color different from that of the front cover and the rear cover, acene is given to the corners of the front cover and the rear cover, which is a preferable design.

In order to assemble the housing constructed as described above, first, the ground pad 1A on the back side of the printed wiring board 1 is formed.
The printed wiring board 1 is placed on the bottom plate 10 of the case so that each of them coincides with the seating 15A of the tip of each supporting piece 15.

Next, the lower edge member 23 of the front cover 20 is the case bottom plate.
Insert the front cover 20 into the case bottom plate 10 from the front so that the side edge member 21 contacts the outside of the bottom plate side plate 11 so that the side edge member 21 is below the front edge of the plate 10, and print the tip seating 25A of each pressing piece 25. The front cover 20 is seated on the ground pad 1A on the surface of the wiring board 1, a small screw is inserted into the screw hole from the lower side of the case bottom plate 10 and screwed into the screw hole of the auxiliary plate member 24, and the front cover 20 is attached to the case bottom plate 10.
Stick to.

On the other hand, the rear cover 30 is arranged from the rear side so that the lower edge member 33 of the rear cover 30 is below the rear edge of the case bottom plate 10 and the side edge member 31 contacts the outside of the bottom plate side plate 11.
To the ground pad 1A on the surface of the printed wiring board 1 and insert a machine screw from the lower side of the case bottom plate 10 into the screw hole to insert the auxiliary plate member 34 into the auxiliary plate member 34. The rear cover 30 to the bottom plate of the case.
Stick to 10.

Then, the tip end of each presser piece 25, 35 is seated.
Small screws 18 are inserted into the holes provided in 25A and 35A and the hole provided in the printed wiring board 1, respectively, and screwed into the screw holes provided in the tip seats 15A of the respective support pieces 15 to tighten the support pieces 15.
The printed wiring board 1 is clamped and fixed by the and the pressing pieces 25 and 35.

Next, the upper cover side plate 41 comes close to the outside of the bottom plate side plate 11, and the front and rear end faces of the upper cover side plate 41 are brought into contact with the end faces of the side edge members of the front cover 20 and the rear cover 30, respectively. The cover 40 is fitted into the case bottom plate 10, and the lower surface of the upper cover 40 is brought into close contact with the upper surfaces of the horizontal portions of the pressing pieces 25 and 35.

Thereafter, the machine screw 13 is inserted into the screw hole of the upper cover side plate 41 and screwed into the screw hole of the bottom plate side plate 11 to fix the upper cover 40 to the case bottom plate 10. As described above, the ground pad 1A on the back surface side of the printed wiring board 1 is directly connected to the support piece 15 provided on the bottom plate of the case, and the ground pad 1A on the front surface side of the printed wiring board 1 is connected to the front cover 20 or The pressing pieces 25 and 35 provided on the rear cover 30 are directly connected.

The supporting piece and the pressing piece are wide. Therefore, noise is not generated or received in the ground connection path between the printed wiring board and the housing.

On the other hand, the housing assembled as described above has a front cover 20, a rear cover 30, and a boundary portion between the upper edge member and the upper cover, and a boundary portion between the side edge member and the upper cover side plate, respectively. There is no step. Therefore, the appearance of the housing is good.

Since the screw hole of the upper cover side plate 41 is provided in the embossed bottom portion, the head of the machine screw 13 sinks in this embossed portion. Therefore, the head of the machine screw 13 does not project to the side surface of the housing, and the appearance of the housing is good.

The prevention of damage to the indicator lamp 2 will be described below with reference to FIGS. 3 and 4. In FIG. 3, reference numeral 50 denotes a tubular portion 51 and a collar 52, and the collar made of an elastic material (soft rubber, thermoplastic resin, or the like) fitted into the window 26 so that the collar 52 is inside the front cover 20. It is an attached sleeve.

The brim sleeve 50 has a through hole 53 that opens toward the head of the indicator lamp 2. Therefore, when the front cover 20 is fitted on the case bottom plate 10, if the head portion of the indicator lamp 2 may come into contact with the flanged sleeve 50, the head portion of the indicator lamp 2 is guided by the through hole 53. Moves in a direction in which the axis of the is aligned with the axis of the through hole 53.

Therefore, the indicator lamp 2 is designed so as to be close to the front cover 20, so that the indicator lamp 2 is not damaged.
Further, since the head of the indicator lamp 2 and the axis of the through hole 53 of the sleeve 50 with the flange are substantially aligned with each other, the lighting state of the indicator lamp 2 can be easily confirmed from the front side of the front cover 20.

In FIG. 4, 55 is composed of a shaft portion 56 and a collar 57, and an elastic material (soft and transparent thermoplastic resin or the like, which is fitted into the window 26 so that the collar 57 is inside the front cover 20. )
It is a transparent body with a brim.

In this transparent body 55 with a collar, a lens-like concave surface 57A is formed in the center of the collar 57 so that the head side of the indicator lamp 2 expands. Further, a lens-shaped convex surface 56A that projects to the front surface of the front cover 20 is formed on the head portion of the shaft portion 56.

When the front cover 20 is fitted to the case bottom plate 10 and the head of the indicator lamp 2 hits the transparent body 55 with a collar, the head of the indicator lamp 2 has a lens-like concave surface 57A in which the transparent body 55 with a collar is expanded. Move to the side and enter into the lens-like concave surface 57A.

Therefore, the light of the indicator lamp 2 travels in the direction of the shaft portion 56 by the lens-shaped concave surface 57A and is diffused in the shaft portion 56. At this time, the lens-like convex surface 56A of the shaft portion 56 projects from the surface of the front cover main plate 20A of the front cover 20. Therefore, the lighting of the indicator lamp 2 can be confirmed not only from the front of the front cover 20 but also from the side.

Other means for improving the appearance will be described below with reference to FIGS. As shown in FIGS. 6 and 7, the front cover 20 includes a front cover main plate 20A, an upper edge member 22, a lower edge member 23, and a pair of side edges provided by bending four sides of the front cover main plate 20A inward. A shallow box shape consisting of the member 21. The left and right ends of the upper edge member 22 are horizontally extended and further bent downward at a right angle to provide two pressing pieces 25, and the tips of the pressing pieces 25 are horizontal. The front end seating is formed by bending it to the ground pad 1A provided on the surface of the front corner of the printed wiring board 1.

At the center of the tip seat 25A, there is a screw hole into which the shaft of the machine screw 18 is fitted. Further, two fixing protrusions 28 are provided on the inner surface side of the upper edge member 22 so as to horizontally protrude inside the casing.
Each of the three fixing protrusions 28 is provided with a screw hole into which a shaft portion of a machine screw 29 fixed to the case bottom plate 10 is inserted.

The front cover 20 as described above has a soft synthetic resin 70 on its outer peripheral surface so that the inner side edge portions of the side edge member 21, the upper edge member 22, and the lower edge member 23 are exposed in a frame shape. It is molded and covered with a cover.

Further, a part of the lower edge member side of the synthetic resin 70 is rectangularly extended to provide an auxiliary plate portion 75, and a claw 76 is provided below the auxiliary plate portion 75. Further, as shown in detail in FIG. 6, the window 26 portion provided in the front cover main plate 20A portion of the front cover 20 corresponding to the indicator light 2 mounted on the front side edge of the printed wiring board 1 is The inner peripheral surface and the peripheral edge of the window 26 on the inner side surface of the front cover main plate 20A are covered with the synthetic resin 70, and the front cover main plate 20
A collar portion 72 is formed on the inner surface of A.

The brim 72 has a through hole that opens toward the head of the indicator lamp 2. On the other hand, as shown in FIG. 7, the front side edge of the case bottom plate 10 is provided with a step in which the case bottom plate 10 and the bottom plate side plate 11 are bent inward to form a side edge member 2 of the front cover 20.
1, to fit inside the lower edge member 23.

The bottom plate side plate 11 portion in front of this step (rear in FIG. 7) is extended to provide a support piece 15. Further, a cover fixing piece 17 is provided side by side with the supporting piece 15, and the head of the cover fixing piece 17 is bent inward at a right angle so as to face the fixing projection piece 28 of the front cover 20, and is attached to the tip portion thereof. A screw hole into which the machine screw 29 is screwed is provided.

On the other hand, the case bottom plate 10 is provided with an engagement hole 19 into which the claw 76 of the synthetic resin 70 of the front cover 20 engages. Although not shown in the drawings, the rear cover 30 is covered with a synthetic resin 70 in substantially the same manner as the front cover 20 (the window 26 is inside and thus has no flange 72), and an auxiliary plate portion with a claw is provided.

In order to assemble the housing constructed as described above, first, the ground pad 1A on the back side of the printed wiring board 1 is to be assembled.
The printed wiring board 1 is placed on the bottom plate 10 of the case so that each of them coincides with the seating 15A of the tip of each supporting piece 15.

Next, the lower edge member 23 of the front cover 20 is the case bottom plate.
The front cover 20 is inserted into the case bottom plate 10 from the front so that the side edge member 21 comes into contact with the outside of the bottom plate side plate 11 so that the side edge member 21 is below the front edge of 10, and the claws 76 of the auxiliary plate portion 75 are attached to the case bottom plate 10. Engagement hole 19
Then, the tip end seats 25A of the respective presser pieces 25 are seated on the ground pads 1A on the surface of the printed wiring board 1.

Then, the fixing projection piece 28 and the cover fixing piece 17 are fixed to each other by using the small screw 29. On the other hand, the rear cover 30 is inserted from the rear into the case bottom plate 10 so that the lower edge member 33 of the rear cover 30 is below the rear edge of the case bottom plate 10 and the side edge member 31 contacts the outside of the bottom plate side plate 11. The claws on the auxiliary plate to the case bottom plate.
It engages with the engaging holes 19 of 10 and seats the tip of each pressing piece 35.
Seat 35A on the ground pad 1A on the surface of the printed wiring board 1.

Then, using the small screw 29, the fixing projection piece and the cover fixing piece are fixed. Insert small screws 18 into the holes provided in the tip seats 25A, 35A of the respective presser pieces 25, 35 and the holes provided in the printed wiring board 1, and insert them into the screw holes provided in the tip seats 15A of the respective support pieces 15. The printed wiring board 1 is pinched and fixed by the support piece 15 and the pressing pieces 25, 35 by screwing and tightening.

Next, the upper cover side plate 41 comes close to the outside of the bottom plate side plate 11, and the front and rear end faces of the upper cover side plate 41 come up so as to contact the end faces of the synthetic resin 70 of the front cover 20 and the rear cover 30, respectively. Insert the cover 40 into the case bottom plate 10 and
The lower surface of is closely contacted with the upper surfaces of the horizontal portions of the pressing pieces 25, 35.

Thereafter, the machine screw 13 is inserted into the screw hole of the upper cover side plate 41 and screwed into the screw hole of the bottom plate side plate 11 to fix the upper cover 40 to the case bottom plate 10.

[0095]

Since the present invention is constituted as described above, it has the following effects.

Since the grounding pads provided on the front and back surfaces of the printed wiring board are sandwiched between the supporting pieces provided on the bottom plate of the case and the holding pieces provided on the front cover and the rear cover, the printed wiring board and the casing are separated from each other. Noise is generated in the ground connection path of
Or you do not receive noise.

Further, the head of the indicator lamp is not damaged, or the lead of the indicator lamp is not bent and damaged. The indicator lamp can be mounted in the housing so that the indicator lamp is close to the front cover, and it is easy to check the lighting state of the indicator lamp.

In the case where the transparent body with a collar is fitted in the window of the front cover, the lighting of the indicator lamp can be confirmed not only from the front of the front cover but also from the side. The appearance of the housing becomes good, and the appearance of the housing can be made a preferable design.

[Brief description of drawings]

FIG. 1 is a perspective view showing the present invention in a separated form.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part of the invention of claim 2;

FIG. 4 is a cross-sectional view of an essential part of the invention of claim 3;

FIG. 5 is a view of the invention of claim 4, (A) is a perspective view of a main part,
(B) is a perspective view before corner clearance treatment, and (C) is a cross-sectional view of a main part.

FIG. 6 is a cross-sectional view of an essential part of an embodiment of the invention of claim 5;

FIG. 7 is a perspective view of an embodiment of the invention of claim 5;

FIG. 8 is a perspective view showing a conventional example in a separated form.

[Explanation of symbols]

1 Printed wiring board 1A Ground pad 2 Indicator 10 Case bottom plate 11 Bottom plate side plate 15 Support piece 15A Tip sitting 20 Front cover 20A Front cover main plate 21,31
Side edge member 22,32 Upper edge member 23,33
Lower edge member 25,35 Presser piece 26 Window 30 Rear cover 30A Rear cover main plate 40 Upper cover 41 Upper cover side plate 50 Collar sleeve 55 Collar transparent body 60,70 Synthetic resin 13,18,29
Machine screw

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideki Zenya 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Mitsuo Okawauchi, 1015, Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited ( 72) Inventor Kenji Shinohara 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Hisato Sato, 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Horizoe Haruhiko 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Limited (72) Inventor Toshiyuki Sakai 1015, Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor, Yasutaka Yamagata, Nakahara-ku, Kawasaki-shi, Kanagawa 1015 Odanaka, Fujitsu Limited (72) Inventor Masato Kobayashi, One, Uchiyukicho, Chiyoda-ku, Tokyo Eyes No. 1 No. 6 Date. This Telegraph and Telephone in the Corporation

Claims (5)

[Claims] 1. A case bottom plate having a pair of left and right bottom plate side plates, a front cover fitted to the front side of the case bottom plate, a rear cover fitted to the rear side of the case bottom plate, and a pair of left and right upper cover side plates. A casing structure of an electronic device that has an upper cover that covers the upper and side surfaces of the case bottom plate and that accommodates the printed wiring board in parallel with the case bottom plate. A plurality of support pieces (15) each having a tip seat (15A) for supporting the back surface of the case, and a part of left and right bottom plate side plates (11) of the case bottom plate (10) extending upward, respectively, and respective tip ends. A plurality of pressers formed by a part of the upper edge member (22) of the front cover (20) extending downward, having a tip seat (25A) seated on the surface of the front side edge of the printed wiring board (1). Piece
(25) and a tip seating (35A) seated on the surface of the rear side edge of the printed wiring board (1) at each tip, part of the upper edge member (32) of the rear cover (30) Plural pressing pieces extending downward
(35), the shafts are fitted into the holes provided in the tip seats (25A, 35A) of the respective holding pieces (25, 35) and the holes provided in the printed wiring board (1), and Seat the tip of the support piece (15) (15
A) is provided with a plurality of machine screws (18) screwed into the screw holes, and each of the supporting pieces (15) has a tip seat (15A) provided on the back surface of the printed wiring board (1). Close to the ground pad,
Each of the pressing pieces (25, 35) supports the printed wiring board (1), and each of the pressing pieces (25, 35) has a grounding pad (1A) provided on the surface of the printed wiring board (1) with a tip seat (25A, 35A). )
Each of the machine screws (18) is tightened so that the support piece (15) and the holding pieces (25, 35) are attached to the printed wiring board (1).
A housing structure for an electronic device, characterized in that it is sandwiched and fixed. 2. A printed wiring board is provided on the front cover (20) of the housing.
The window (26) is perforated to correspond to the indicator light (2) mounted on the front side edge of (1), and is composed of the tubular portion (51) and the collar (52), and the collar (52) is the front cover ( A flanged sleeve (50) made of an elastic material that fits into the window (26) is provided inside the window (26), and the flanged sleeve (50) is the head of the indicator lamp (2). The housing structure for an electronic device according to claim 1, wherein the housing structure has a through hole whose side is widened. 3. A printed wiring board is provided on the front cover (20) of the housing.
A window (26) is perforated corresponding to the indicator light (2) mounted on the front side edge of (1), and comprises a shaft portion (56) and a collar (57), the collar (57) being the front cover ( The transparent body (55) with a collar made of an elastic material that fits into the window (26) is provided inside the window (26), and the transparent body with a collar (55) is at the center of the collar (57). Indicator on the part
A lens-like concave surface (57A) is formed which widens the head side of (2), and a lens-like convex surface (56A) is formed on the head of the shaft portion (56) so as to project to the front surface of the front cover (20). The housing structure for an electronic device according to claim 1, wherein the housing structure is an electronic device. 4. The front cover (20) is a front cover main plate (20A).
And a front edge of the front cover main plate (20A), each of which is formed by bending four sides of the upper edge member (22), a lower edge member (23), and a pair of side edge members (21). , The back cover (30) is the same as the back cover main plate (30A).
(30A) is a shallow box shape composed of an upper edge member (32), a lower edge member (33), and a pair of side edge members (31) each of which is formed by bending the four sides inward, and each side edge A corner gap between the member (21, 31) and the upper edge member (22, 32), and the respective side edge member (21, 3)
4. The corner gap between 1) and the lower edge member (23, 33) is filled with a synthetic resin (60) having an arcuate outer peripheral surface, respectively. Electronic device housing structure. 5. The front cover (20) is a front cover main plate (20A).
And a front edge of the front cover main plate (20A), each of which is formed by bending four sides of the upper edge member (22), a lower edge member (23), and a pair of side edge members (21). , The back cover (30) is the same as the back cover main plate (30A).
The rear cover (30A) has a shallow box-like shape including an upper edge member (32), a lower edge member (33), and a pair of side edge members (31) provided by bending four sides of the rear cover (30A) inwardly. ) Is covered with synthetic resin, the surface of the front cover (20) is covered with synthetic resin (70), and the indicator light (2) mounted on the front side edge of the printed wiring board (1)
The inner peripheral surface of the window (26) provided corresponding to and the peripheral edge of the window (26) on the inner surface of the front cover (20) are covered with the synthetic resin (70), The synthetic resin (70) has a through hole with an expanded head side.
The casing structure of the electronic device according to claim 1, wherein the casing structure is formed of