JPH0215352Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a printed circuit board fixing device.

(b) Prior Art In video tape recorders and the like, the printed circuit board constituting the circuit is usually removably fixed to the chassis. This is done in consideration of workability during repair, and conventionally, for example, a configuration as shown in FIG. 1 has been used.
A hinge member 2 is attached to one end of the printed circuit board 1. Then, the hinge member 2 and the printed circuit board 1 are fixed to the chassis of a device (not shown) using screws 3 and 4. At the time of repair or inspection, the screws 4 fixing the printed circuit board can be removed to make the printed circuit board 1 rotatable around the hinge member 2.

The problem in this case is that screws are used for fixing, making attachment and detachment laborious.

Furthermore, if a metal bottom plate (not shown) of the device is placed close to the printed circuit board surface (whether it is a pattern surface or a component mounting surface) 1a, a spacer is placed on the printed circuit board. This was necessary for other work.

(c) Purpose of the invention This invention was created in view of the above points,
To provide a board fixing device which allows easy attachment and detachment of a printed circuit board to make it rotatable and fixes it again, and does not require a separate spacer.

(d) Structure of the invention The invention uses a fixture that engages with the other end of the printed circuit board, one end of which is rotatably supported, opposite to said one end. This printed circuit board is supported by fitting into a recess having an opening in the bottom surface of the equipment chassis. The above-mentioned fixture has an engaging part with the printed circuit board, an engaging part with the chassis recess, and a spacer between the printed circuit board and the bottom plate disposed on the bottom surface of the chassis, which are integrally formed of resin.

(e) Examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a bottom view of the resin chassis 5 of the video tape recorder. The bottom surface 5a of the chassis 5 includes a through-hole portion 5b to which a mechanism such as a loading mechanism is attached, and a recess 5 in which a printed circuit board is placed.
c is provided. The opening of the recess 5c is located on the bottom side of the chassis 5, and the printed circuit board is fixed here. The recess 5c includes an engaging portion 5d that engages with a hinge member that rotatably supports the printed circuit board;
Convex portion 5 that comes into contact with the printed circuit board to regulate the height
e, and a convex portion 5f that engages with a fixing tool to be described later. The engaging convex portion 5f is also designed to regulate the position of the printed circuit board. A broken line 6 indicates a metal bottom plate, and its fixing means are omitted. A metal bottom plate is provided for shielding, etc.

3 and 4 are a perspective view and a sectional view showing the printed circuit board and the fixture. The fixing tool 7 engages with an end portion 8a of a hinge member (not shown) opposite to one end of the printed circuit board 8 to which it is fixed. FIG. 5 is a front view (a) and a back view (b) showing the fixture.

As shown in FIG. 5, the fixture 7 includes a base body 9 consisting of a portion 9a parallel to the printed circuit board 8 and a portion 9b that abuts orthogonally to the printed circuit board 8 in the attached state, and a contact portion 9b.
The printed circuit board 8 extends from the surface opposite to the surface of the printed circuit board on which the abutting portion 9b contacts the horizontal portion 9a.
the first claw pieces 7a, 7a that engage with the horizontal portion 9a;
second claw pieces 7b, 7b that extend further and engage with the engagement protrusion 5f of the chassis; and a protrusion piece 7c that extends from the abutting portion 9b and corresponds to the first claw piece 7a.
and a protrusion 7d which protrudes from the lower part of the wing portion 9c in the horizontal portion 9a and comes into contact with the printed circuit board are integrally formed of resin.

A notch 8b is formed in an end portion 8a of the printed circuit board 8, on which the fixture 7 is attached, to match the fixture. The first and second claw pieces 7a and 7b fit into this notch 8b. The through hole 8c is engaged with the first claw piece 7a. The state in which the printed circuit board 8 and the fixture 7 are engaged is clearly shown in FIG. The first claw piece 7a and the protruding piece 7c opposite thereto
The fixture 7 is engaged in such a way as to be sandwiched between the two.

FIG. 6 is a perspective view showing a part of the chassis 5, the printed circuit board 8, and the fixture 7. Also shown in FIG. 6 is hinge member 10. The hinge member 10 is a resin molded product, and includes a locking piece 10a that engages with the printed circuit board 8, an engaging means 10b that engages the engaging portion 5d, and a thin wall portion 1 that has a hinge function, although not shown explicitly.
0c, and a contact plate 10d from which the locking piece protrudes;
A leg portion 10e extending from the contact plate 10d is integrally molded. The hinge member 10 engaged with the printed circuit board 8 by the locking piece 10d engages with the chassis engaging portion 5d, so that the printed circuit board 8 is rotatably supported with respect to the chassis recess 5c. FIG. 7 is a sectional view showing the engagement between the hinge member 10 and the chassis engaging portion 5d.

The printed circuit board 8 is shaped to fit into a recess 5c on the bottom of the chassis, and when the printed circuit board 8 supported by the hinge member 10 is inserted into the recess 5c, it engages with the second claw piece 7b of the fixture 7 and the chassis. The notch (or through hole) 11 provided in the mating convex portion 5f engages, and the fixation of the printed circuit board 8 is completed. Although it is difficult to see in the figure, the top surface of the engaging convex portion 5f is open, and when the engagement with the fixture 7 is to be released, the second claw piece 7a can be bent from there.

When the printed circuit board 8 is fixed, the recess 5c
The convex portions 5e and 5f in contact with the printed circuit board 8 for positioning. When the bottom plate is fixed to the chassis bottom surface 5a, the legs 10e of the hinge member 10
The horizontal portion 9a of the fixture base 9 comes into contact with the bottom plate. This horizontal portion 9a is supported by a contact portion 9b with the printed circuit board 8, a protrusion piece 7c, and a protrusion 7d, and functions as a spacer that defines the distance between the bottom plate and the printed circuit board 8.

The part of the fixture 7 that comes into contact with the printed circuit board 8 is the exposed surface when the printed circuit board is fixed (the board in the embodiment is a double-sided board, but this is mainly the surface on which the pattern is formed), and the contact part 9b, There are only the protruding pieces 7c and the protrusions 7d, which are smaller than the horizontal portion 9a that contacts the bottom plate. Therefore, although the area of the horizontal portion 9a that contacts the bottom plate is large and the effect as a spacer is large, the dead space on the printed circuit board 8 is reduced.
A pattern can also be formed in the portion covered by the horizontal portion 9a to form an insertion hole for an electronic component. This effect is also achieved by the wing portions 9c formed at the ends of the printed circuit board so that they approach the center of the base 9 as they move away from the center. The wide area of the horizontal portion 9a leads to good workability when attaching and detaching the fixture 7 and the engaging convex portion 5f. This is because the printed circuit board 8 fits into the chassis recess, and the fixture 7 is directly touched with the hand to engage and release the engagement with the chassis. The recess 9d in the wing portion 9c makes the fixture 7 more effective as a handle.

(f) Effects of the invention As described above, according to the invention, screws and the like are not required when fixing the printed circuit board, and the work of attaching and detaching is easy. In addition, the fixing device doubles as a spacer with the bottom plate, so there is no need to install it separately, which is effective.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Figs. 2 to 7 relate to the present invention, Fig. 2 is a bottom view of the chassis, and Fig. 3 is a perspective view showing a conventional example.
The figure is a perspective view showing a part of the printed circuit board and the fixing device.
Figure 4 is a sectional view showing the engagement between the printed circuit board and the fixture, Figure 5 is a front view and back view of the fixture, and Figure 6 is a diagram showing the relationship between the chassis, the printed circuit board, and the fixture. FIG. 7 is a sectional view showing the engagement between the hinge member and the chassis. Explanation of main drawing numbers, 5... Chassis, 5c... Recess, 8... Printed circuit board, 7... Fixture, 7a...
...First claw piece, 7b... Second claw piece, 6... Bottom plate, 9
a...Horizontal portion, 9b...Abutment portion, 7c...Protrusion piece, 7d...Protrusion (the above four constitute a spacer).

Claims (1)

[Claims for Utility Model Registration] A board fixing device for fixing a printed circuit board to a recess provided on the bottom of a chassis of a device, wherein one end of the printed circuit board is rotatably fixed to one end of the recess. a hinge member for fixing the other end of the printed circuit board to the recess; The fixture includes a first claw piece that engages with the other end of the printed circuit board, and a second claw piece that engages with the other end of the recess, which are integrally molded. and when the printed circuit board and the recess are disengaged by the fixture, the printed circuit board is rotatable by the hinge member, and the legs of the hinge member are fixed. A board fixing device characterized in that the thickness of the tool from the printed circuit board functions as a spacer that prevents contact between the printed circuit board and a metal bottom plate covering the recess.