JPS608460Y2 - Fixed structure of printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for fixing a printed circuit board in which an externally operable electric component such as a keyboard is mounted, which is not fixed to the front panel of a housing of an electronic device.

Conventionally, when a printed circuit board on which externally operated electrical components such as a keyboard are mounted is disposed inside a housing, a front chassis is generally erected behind the printed circuit board and fixed thereto.

However, if the front chassis is installed upright, the mounting density of electrical components will be poor, leading to an increase in the size of the casing itself.

In addition, if the keyboard is mounted in the center of the printed circuit board, the printed circuit board will deform when the keyboard is operated, so to prevent this, a part of the front chassis is fixed in contact with the deformed part of the printed circuit board. However, with this method, the chassis itself has a complicated structure, which increases costs, and there are also disadvantages such as the need to consider insulation from the back pattern of the printed circuit board.

The present invention was developed in view of the above-mentioned drawbacks of the conventional technology, and has an extremely simple structure in which the printed circuit board is supported from behind by a mounting plate made of an insulating material, thereby preventing deformation of the printed circuit board due to keyboard operations, etc. The present invention also provides a printed circuit board fixing structure that improves the mounting density of electrical components and makes it possible to downsize electronic devices.

The present invention will be described in detail below based on embodiments shown in the drawings.

Figure 1 is an overall perspective view showing the inside of the casing with the top open;
Figure 2 is a partially exploded perspective view of the inside of the housing seen from the back side.
FIG. 3 is an exploded perspective view showing main parts taken out.

In these figures, the reference numeral 1 indicates a housing of an electronic device, and the housing 1 is formed into a box shape, and electrical components such as a transformer 3 are fixed to the inner bottom surface of the housing.

Further, inside the casing 1, a printed circuit board 2 is disposed behind and parallel to the front plate 4 constituting the casing 1 with an appropriate gap therebetween.

On the surface of this printed circuit board 2, there are two types of externally operable electrical components, namely lever switches 6 arranged at both ends of the surface of the printed circuit board 2 and fixed to the back surface of the front plate 4.
, a rotary switch 7, and other electrical components such as, for example, two keyboard switches 8, which are arranged at the center of the front surface and are not fixed to the back surface of the front plate 4.

Further, a capacitor 5 is mounted on the front side of the printed circuit board 2, and an indicator 14 such as a timer is mounted on the center of the surface.

On the other hand, a predetermined electric circuit is printed and wired on the back surface of the printed circuit board 2.

The above-mentioned lever switch 6 is mounted on the front plate 4 of the housing 1.
A lever switch mounting hole 9, a rotary switch mounting hole 10, a keyboard switch mounting hole 11, and a display mounting hole 15 are drilled corresponding to the rotary switch 7, keyboard switch 8, and display 14. The operators of the switches 6 to 8 are inserted through the mounting holes 9 to 11 so as to be rotatable or retractable, and protrude from the front surface of the housing 1.

The switch body of the lever switch 6 is fixed to the back surface of the front plate 4 by two screws 12 screwed into the screw holes of the front plate 4, and the switch body of the rotary switch 7 has a threaded portion protruding from the rotary switch mounting hole 10. 7a
It is fixed to the front plate 4 by screwing a nut 13 from the front of the housing 1.

In other words, the printed circuit board 2 is connected to the lever switch 6 described above.
and is fixed to the front plate 4 via a rotary switch 7.

An elongated rectangular hole 16 is formed in the upper part of the printed circuit board 2 where the keyboard switch 8 is attached.

A support portion 18 integrally provided at the center of the distal end surface of a mounting plate 17 made of a plate-shaped insulating member is fitted into this rectangular hole 16 from the rear.
b is in contact with the back surface of the printed circuit board 2.

The mounting plate 17 extends almost horizontally behind the printed circuit board 2 and has a rotation stopper hole 19 and a screw mounting hole 20 at its rear end. By fitting the small-diameter protrusion 22 of the protruding boss part 21 and screwing the set screw 23 inserted into the screw mounting hole 20 into the screw hole provided on the upper end surface of the other boss part 24, the mounting plate can be assembled. 1
The rear end portion of 7 is fixed to the upper surface of the l pair of boss portions 21 and 24.

Therefore, the portion of the printed circuit board 2 where the keyboard switch 8 is attached is supported from behind by the mounting plate 17, thereby preventing the portion from being deformed when the keyboard is operated.

Note that 25 is an outlet attached to the rear plate 26 of the housing 1.

When installing the printed circuit board 2, after mounting various electrical parts such as the lever switch 6, rotary switch 7, keyboard switch 8, and display 14 in advance to form a printed circuit board unit, this unit is installed from the top of the housing 1 to the front. The operating parts of the switches 6 to 8 are inserted into the respective mounting holes 9 to 11 to protrude to the front of the housing 1, and the lever switch 6 and rotary switch 7 are secured to the screws 12 and nuts. At 13, the printed circuit board 2 is fixed to the front plate 4, respectively, and the printed circuit board 2 is fixed to the housing 1. After that, the support part 18 of the mounting plate 17 is fitted into the rectangular hole 16 of the printed circuit board 2 from behind, and at the same time, the mounting plate 17 is fixed to the front plate 4. is the boss part 21.2
4 to complete the installation of the printed circuit board 2.

Note that the mounting plate 17 is not limited to one keyboard switch 8.
Of course, a plurality of them may be provided depending on the number of them.

As explained above, the printed circuit board fixing structure according to the present invention fixes the electrical components mounted on the printed circuit board to the back of the front panel of the casing, so that the printed circuit board is placed parallel to the rear of the front panel at an appropriate distance. The printed circuit board is fixedly arranged, and the parts that are deformed by other externally operable electrical parts that are not fixed to the housing of this printed circuit board are supported from the rear by a mounting plate made of an insulating material. It is possible to prevent accidents such as damage, short-circuits, and breakdowns.

In addition, the front end of the mounting plate is engaged with the hole in the printed circuit board, and the rear end is fixed to a pair of bosses protruding from the bottom of the chassis to prevent rotation, compared to conventional front chassis. It has a very large practical effect, such as being small, simple in structure, easy to install, improving the packaging density of electrical components, and making electronic equipment more compact and cost-reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an overall perspective view showing the inside of a casing with its top surface open, showing an embodiment of the printed circuit board fixing structure according to the present invention;
Figure 2 is a partially exploded perspective view of the same case as seen from the back side, Figure 3
The figure is an exploded perspective view showing the main parts taken out. 1... Housing, 2... Printed circuit board, 4
・・・・・・Front plate, 6...Central lever switch, 7...
Rotary switch, 8...Keyboard switch, 17...Mounting plate.

Claims (1)

[Scope of utility model registration request] a casing; a printed circuit board disposed behind and parallel to the front plate at an appropriate distance from the front plate constituting the casing;
An externally operable electrical component mounted on the printed circuit board and fixed to the front plate; another externally operable electrical component also mounted on the printed circuit board but not fixed to the front plate; An insulator that engages from the back side of the printed circuit board into a hole provided near a portion of the printed circuit board where the other electrical component is attached to prevent deformation of the other electrical component of the printed circuit board due to external manipulation. A mounting plate made of a member, and a pair of boss portions each protruding from the inner bottom surface of the housing relative to the rear end of the mounting plate,
A fixed structure for a printed circuit board, wherein a rear end of the mounting plate is fixed to the pair of boss portions to prevent rotation.