JPH11340657A - Method and device for fitting printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for fitting a printed board with less restrictions on the design of a wiring pattern in the printed board and the arrangement and the array of electronic parts. SOLUTION: A chassis 1 formed of an upper chassis 1a and a lower chassis 1b, a plurality of bosses 3 formed of insulators protruded to the upper face of the lower chassis 1b and a pressurizing member 4b formed of a screw axis 4a, and the insulator provided below the screw axis 4a are provided. The screw axis 4a is constituted of a plurality of fixing means 4 which is screwed into the upper chassis 1a. The screw axis 4 is rotated and a printed board 2 is sandwiched between the boss 3 and the pressurizing member 4b. Thus, the printed board 2 is fitted to the chassis 1, and therefore it is not necessary to provide a fitting hole in the printed board 2. Then, the design of a wiring pattern and the arrangement/array of electronic components is less likely to receive restrictions at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mounting a printed circuit board on a chassis provided in an electronic device.

[0002]

2. Description of the Related Art Conventionally, electronic equipment is provided with a metal chassis, and a printed circuit board on which electronic components and the like are mounted is mounted on the chassis.

As a method of mounting a printed circuit board on a chassis, a method shown in FIGS. 2 and 3 has conventionally been generally employed.

In the method shown in FIG. 2, a plurality of bosses d having screw holes are projected on the upper surface of a lower chassis b of a chassis c composed of an upper chassis a and a lower chassis b, and a printed circuit board e is mounted on these bosses d. The printed circuit board e is fixed to the lower chassis b by mounting and screwing a fixing tool f such as a screw into the screw hole of the boss d from the mounting hole opened in the printed circuit board e. .

In the mounting method shown in FIG. 3, a plurality of mounting pieces g are protruded from the upper surface of the lower chassis b, and a printed circuit board e is placed on these mounting pieces g.
By screwing a fixing tool f such as a screw into a screw hole formed in the mounting piece g from the mounting hole opened in
The printed circuit board e is fixed to the lower chassis b.

[0006]

However, in the above-mentioned conventional method of mounting a printed circuit board, it is necessary to previously open a mounting hole in the printed circuit board e, so that the wiring pattern of the printed circuit board e and the arrangement and arrangement of the electronic components must be adjusted. When designing, it is necessary to design the wiring pattern and the arrangement and arrangement of the electronic components while avoiding the mounting hole of the printed circuit board e, the boss d provided on the lower chassis side, and the mounting piece g, and the design is restricted. There was a problem such as receiving.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a method and an apparatus for mounting a printed circuit board which are less restricted by the design of a wiring pattern of the printed circuit board and the arrangement and arrangement of electronic components. The purpose is to provide.

[0008]

According to the present invention, a plurality of bosses made of an insulator are projected from an upper surface of a lower chassis, and a printed circuit board is mounted on the bosses. Further, the printed circuit board is fixed to the chassis by sandwiching the printed circuit board between the pressing member made of an insulator of the fixing means provided on the upper chassis side and the boss. Since there is no need to provide mounting holes, there is little restriction on the design of wiring patterns and the arrangement and arrangement of electronic components.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a plurality of bosses made of an insulator are protruded from an upper surface of a lower chassis of a chassis composed of an upper chassis and a lower chassis, and the bosses are formed on the bosses. On the upper chassis side, a fixing means composed of a screw shaft and a pressing member made of an insulator is provided, and the screw shaft of the fixing means is rotated, and the boss and the pressing member are mounted on the upper chassis. The printed circuit board is fixed to the chassis by sandwiching the printed circuit board between them.

According to the above mounting method, the mounting of the printed circuit board can be performed only by pressing the pressing member to the printed circuit board by rotating the screw shaft, so that the mounting operation of the printed circuit board can be performed efficiently in a short time.

According to this mounting method, since it is not necessary to provide mounting holes in the printed circuit board, it is not necessary to design wiring patterns and arrangement and arrangement of electronic components in consideration of the mounting holes. The degree of freedom increases.

According to a second aspect of the present invention, there is provided a chassis including an upper chassis and a lower chassis, a plurality of bosses formed of an insulator protruding from an upper surface of the lower chassis, a screw shaft, and the screw shaft. And a plurality of fixing means whose screw shafts are screwed into the upper chassis.

According to the above construction, the printed circuit board is placed on the boss of the lower chassis, the screw shaft of the fixing means is rotated, and the printed circuit board is sandwiched between the pressing member and the boss, whereby the printed circuit board is fixed to the chassis. Since the printed circuit board can be mounted, it is not necessary to design the wiring pattern and the arrangement and arrangement of the electronic components in consideration of the mounting holes. Therefore, when the printed circuit board is mounted, even if these bosses or pressing members come into contact with a wiring pattern, an electronic component, or the like, there is no problem.

According to a third aspect of the present invention, a lock nut for fixing the rotation of the screw shaft is provided on the screw shaft of the fixing means.

According to the above configuration, after the printed circuit board is fixed by the fixing means, the screw nut can be prevented from being loosened by tightening the lock nut, so that the mounting failure of the printed circuit board occurs during use of the electronic device. Nothing.

An embodiment of the present invention will be described below in detail with reference to the drawing shown in FIG.

In FIG. 1, reference numeral 1 denotes a chassis provided in an electronic device, and an upper chassis 1a and the upper chassis 1a.
And a lower chassis 1b provided below the lower chassis 1b.

On the upper surface of the lower chassis 1b, bosses 3 for mounting the printed circuit board 2 are fixed at a plurality of positions by fixing means (not shown) such as screws.

The boss 3 is formed in a cylindrical shape with an insulating material such as a hard material, and has a chamfered peripheral edge on an upper surface and a flat surface 3a on an upper end surface.
The printed circuit board 2 can be stably mounted.

On the chassis 1a side, screw holes 1c are formed at positions opposed to the bosses 3 fixed to the lower chassis 1b side.
The screw shaft 4a is screwed from the lower surface side.

The fixing means 4 includes a metal screw shaft 4a.
And a pressing member 4b provided on the lower end side of the screw shaft 4a.
And

The pressing member 4b is formed of an insulating material such as a hard material in substantially the same shape as the boss 3, and the lower end of the screw shaft 4a is fixed to the upper end surface by means such as insert or press fitting. At the same time, the lower end surface is a flat surface 4c similar to the upper surface of the boss 3.

At the upper end of the screw shaft 4a, there is formed a tool groove 4d for inserting a tool such as a driver (not shown) to rotate the screw shaft 4a. Is screwed with a lock nut 5 for fixing the rotation of the screw shaft 4a.

Next, a method of attaching the printed circuit board 2 to the chassis 1 by the printed circuit board fixing device constructed as described above will be described.

In fixing the printed circuit board 2, first, the screw shaft 4a of the fixing means 4 provided on the upper chassis 1a side is rotated by a tool such as a screwdriver, and the pressing member 4b below the screw shaft 4a is moved to the upper limit. Raise to near.

In this state, the upper and lower chassis 1a,
1b, the printed circuit board 2 is inserted.
Is mounted on a boss 3 projecting from the upper surface of the lower chassis 1b, and the printed circuit board 2 is positioned.

At this time, since the mounting holes are not formed in the printed circuit board 2 as in the prior art, the operation of accurately positioning the mounting holes and the bosses 3 becomes unnecessary, and the bosses 3 are formed of an insulator. Therefore, there is no problem even if the wiring pattern overlaps with the wiring pattern of the printed circuit board 2, so that the wiring pattern can be designed without concern for the position of the boss 3.

After the printed circuit board 2 is placed on the boss 3 as described above, the screw shaft 4a is rotated by a tool or a hand,
The pressing member 4b at the lower end of the screw shaft 4a is lowered, and the pressing member 4
When the lower surface 4c of b contacts the upper surface of the printed circuit board 2, the screw shaft 4a is further tightened by a tool, and the printed circuit board 2 is sandwiched between the boss 3 and the pressing member 4b from above and below.
The printed circuit board 2 is fixed to the upper and lower chassis 1a, 1b.

When the fixing of the printed circuit board 2 is completed, the lock nut 5 is tightened to prevent the screw shaft 4a from being loosened. The mounting of the printed circuit board 2 can be easily performed in a short time, and the pressing member 4b is also used. Since it is formed of an insulator, even if it overlaps with the wiring pattern or there is no problem even if the electronic components come into contact with it, it is possible to design the wiring pattern without worrying about the position of the pressing member 4b. Since the arrangement and arrangement of the electronic components can be performed without largely avoiding the pressing member 4b, design restrictions can be reduced.

[0030]

As described in detail above, the present invention projects a plurality of bosses made of an insulator on the upper surface of a lower chassis, mounts a printed circuit board on these bosses, and furthermore, The printed circuit board is fixed to the chassis by sandwiching the printed circuit board between the pressing member made of an insulator of the fixing means provided in the above and the boss, and mounting holes are formed in the printed circuit board. Since there is no need to provide them, alignment at the time of mounting is not required, and thus mounting work can be performed efficiently in a short time.

Since mounting holes are not required in the printed circuit board, it is not necessary to design wiring patterns and arrangement and arrangement of electronic components in consideration of the mounting holes, so that the degree of freedom in design is greatly increased. Since the boss and the pressing member are formed of an insulator, there is no trouble at all when the boss and the pressing member come into contact with the wiring pattern or the electronic component when the printed circuit board is mounted.

Further, a lock nut is provided on the screw shaft of the fixing means, and after the printed circuit board is fixed, the screw nut is prevented from being loosened by the lock nut, so that the mounting failure of the printed circuit board occurs during use of the electronic device. There is no danger.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a printed circuit board mounting apparatus according to an embodiment of the present invention;

FIG. 2 is an explanatory view showing a conventional method of mounting a printed circuit board.

FIG. 3 is an explanatory view showing a conventional method of mounting a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis 1a Upper chassis 1b Lower chassis 1c Screw hole 2 Printed circuit board 3 Boss 3a Flat surface 4 Fixing means 4a Screw shaft 4b Pressing member 4c Flat surface 4d Tool groove 5 Lock nut

Claims (3)

[Claims] 1. A plurality of bosses made of an insulator protrude from an upper surface of a lower chassis of a chassis made up of an upper chassis and a lower chassis, and a printed circuit board is placed on these bosses.
Further, on the upper chassis side, a fixing means comprising a screw shaft and a pressing member made of an insulator is provided, and the screw shaft of the fixing means is rotated to pinch the printed circuit board between the boss and the pressing member. And fixing the printed circuit board to the chassis. 2. A chassis comprising an upper chassis and a lower chassis, a plurality of bosses made of an insulator protruding from an upper surface of the lower chassis, a screw shaft, and an insulator provided at a lower end of the screw shaft. A printed circuit board mounting device comprising: a pressing member; and a plurality of fixing means having a screw shaft screwed into the upper chassis. 3. The printed circuit board mounting device according to claim 2, wherein a lock nut for fixing rotation of the screw shaft is provided on the screw shaft of the fixing means.