JPH0451513Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a holding structure for a printed wiring board, and in particular, it utilizes the wiring board surface with high efficiency by holding the printed wiring board only in a small area around its periphery. The present invention relates to a holding structure for a printed wiring board.

BACKGROUND OF THE INVENTION In various electronic devices, in order to downsize the device, it is often necessary to attach another printed wiring board so as to cover one printed wiring board in parallel. Conventional methods used for this type of attachment use studs, screws, or soldered metal plates as supporting components, which increases the area occupied by the supporting components and reduces the density of components and circuit patterns on printed wiring boards. I couldn't avoid the drawbacks I was forced to face. Furthermore, the above-mentioned supporting parts have the drawback that they are a nuisance during maintenance work, and their removal and assembly after repair is troublesome.

Purpose of the invention Therefore, the purpose of the present invention is to provide a holding structure for a printed wiring board that effectively utilizes the surface by holding only a small area around the periphery of the printed wiring board, thereby overcoming the above-mentioned drawbacks of the prior art. There is a solution.

Composition of the Invention In order to achieve the above object, the printed wiring board holding structure according to the invention is such that the printed wiring board is held in parallel with the plate member to which the cylindrical case is detachably attached. A holding member having a U-shaped cross section, having a notch in the periphery, two parallel side plates, and a connecting portion between both parallel side plates, and a holding member opposite to the connecting portion of the holding member so as to fit into the notch in the plate-like member. a hook portion integrally formed on the side edge; and a pair of holding portions formed on opposing surfaces of the parallel side plates so as to engage with the protrusion of the printed wiring board; The printed wiring board is held parallel to the connecting portion, and the U-shaped edge of the holding member that is locked to the plate member is engaged with the inner surface of the cylindrical case when the cylindrical case is attached. The following structure is used.

Embodiment The present invention will be described in detail below with reference to the controller shown in the attached drawings incorporating an embodiment of the present invention.
The invention is not limited to the illustrated embodiment.
The controller shown in the perspective view of FIG. 1 has a display/adjustment unit 1, a cylindrical case 2, preferably of square cross section, and a terminal block unit 3 screwed to the cylindrical case 2. The display/adjustment unit 1 has a structure that allows it to be easily pulled out from the cylindrical case 2 during maintenance work or the like. That is, as shown in the cross-sectional view of FIG.
Printed wiring boards 1a, 1b, 1c related to control etc. are integrally combined, and these printed wiring boards 1a, 1
b and 1c are inserted into the cylindrical case 2 together with the display/adjustment unit 1 and pulled out from the same case 2.

The illustrated terminal board unit 3 includes a transformer 4, a plate member 5 which is a printed wiring board in this case, a plurality of terminal hardware 6, an input/output connector 7, a holding member 8, a printed wiring board 9, and an internal connector 10. has. Lead portions of terminal metal fittings 6 for power sources and other devices are fixed to the printed wiring board of board member 5 by soldering. The internal connector 10 is for connecting electrical circuits such as printed wiring boards 1a, 1b, 1c of the display/adjustment unit 1 to the terminal board unit 3, and together with the input/output connector 7, the printed wiring board of the plate member 5. Fixed.

The holding member 8 described below is an example of being attached to the plate member 5 of the terminal board unit 3, but the holding member 8 of the present invention is not limited to being attached to the terminal board unit 3 side. For example, it can be attached to any plate-like member inside the cylindrical case 2, such as the printed wiring board 1b or 1c shown in FIG.

In FIG. 3, which shows an exploded perspective view of the main parts, a plate-like member 5, which is a printed wiring board in this case, has four parts on its periphery.
Notches 5a are provided. The holding member 8 has two parallel side plates 8a, a connecting part 8b that connects the side plates 8a at one end, and four hook parts 8c integrally formed on the other ends of the both side plates 8a. The relative position and size of the hook portion 8c are selected so that the hook portion 8c fits into the notch 5a of the plate member 5. Preferably,
A notch 8d for locking the protrusion 9a of the printed wiring board 9 to be held is provided on the upper edge of the both side plates 8a.

Referring to the partially cut-away plan view in FIG. 4 and the partially cut-away side view in FIG. The parts 8e are attached integrally and in pairs. When the printed wiring board 9 can be held only by the guide part 8e, for example by making the guide part 8e an elastic member or by providing the printed wiring board 9 with a thick part (not shown) that engages with the upper end of the guide part 8e. , both side plates 8a
The cutout 8d may be omitted. That is, the protrusion 9a and/or the thick portion (not shown) of the printed wiring board 9 form a protrusion, and the notch 8d of the holding member 8 forms a protrusion.
And/or the guide part 8e forms a holding part, and the printed wiring board 9 is connected to the connecting part 8 of the holding member 8 by this holding part.
Hold parallel to b. When the holding member 8 is locked to the plate member 5 by fitting the hook portion 8c and the notch 5a, the printed wiring board 9 can be held parallel to the plate member 5.

The side plates 8a of the holding member 8 have parallel edges 8m at their free ends, and the connecting portion 8b and the tops of the side plates 8a form U-shaped edges 8n.

Referring to FIG. 5, the connecting portion 8b of the mounting member 8
If a bottom plate 8f is provided integrally with the bottom plate 8f and a heat sink of a three-terminal element 11 such as a thyristor is screwed to this bottom plate 8f, an excellent heat radiation effect can be obtained. In this case, it is advantageous to manufacture the holding member 8 from a material with good thermal conductivity, such as a metal plate. Number 1 in Figure 4
2 shows a circuit element attached to the plate member 5 and the printed wiring board 9. As shown in FIG. To facilitate the dissipation of heat generated by these elements 12 and others, one or more ventilation holes 8g may be provided as shown in FIGS. 3 and 3.

To explain the function, the hook portion 8c of the holding member 8 is
As shown in FIGS. 4 and 5, it has a shape that locks the holding member 8 to the plate-like member 5. That is, the terminal board unit 3 of the embodiment shown in both figures has a groove 3a in its side wall, and the hook portion 8c inserted into the notch 5a of the plate member 5 enters into this groove 3a, and the hook portion 8c recessed part 8
h (FIG. 3) fits into the plate member 5. Hook part 8c
When it fits into the notch 5a of the plate member 5 in this way, both parallel edges 8m of both side plates 8a of the holding member 8
engages with a small area of the peripheral edge of the plate member 5, as shown in FIG. In addition, in FIG. 2 and FIG. 5, the distance between the parallel edge 8m and the plate-shaped member 5 is exaggerated to clarify the parallel edge 8m.

At this time, the holding member 8 is movable in the vertical direction indicated by arrow V in FIG. However, the movement of the holding member 8 in the front-rear direction of the arrow X and the left-right direction of the arrow Y in FIG. Both are limited by engagement.

Next, when the cylindrical case 2 is fitted with the terminal board unit 3, the U-shaped edge 8n of the holding member 8 comes into contact with the inner surface of the cylindrical case 2, and due to this contact, the holding member 8 is Movement in the V direction, that is, in the vertical direction is restricted. Therefore, the printed wiring board 9 is attached to the holding member 8
As a result, the printed wiring board 9 is fixed in the vertical, horizontal, and front-back directions, and the desired purpose of attaching the printed wiring board 9 to the plate-like member 5 is achieved.

Wiring connections to the printed wiring board 9 can be made at an appropriate time before attaching the cylindrical case 2, for example, using the holding member 8.
This can be done before or after inserting the printed wiring board 9 into the guide portion 8e.

To remove the printed wiring board 9 from the holding member 8 for maintenance etc., simply remove the unit board 3 from the cylindrical case 2.
It is enough to pull it out. That is, when the U-shaped edge 8n of the holding member 8 is released from contact with the inner surface of the cylindrical case 2, the printed wiring board 9 becomes movable in the vertical direction indicated by the arrow V in FIG. Furthermore, if the hook portion 8c is removed from the notch 5a of the plate-like member 5, the printed wiring board 9 becomes movable in the front-rear direction and the left-right direction as indicated by the arrows X and Y in FIG. Therefore, the printed wiring board 9 held by the holding member 8 of the present invention is easy to remove and convenient for maintenance.

Effects of the Invention As explained above, the printed wiring board holding structure according to the present invention holds the printed wiring board only in a small area around its periphery, and therefore has the following remarkable effects.

(b) Compared to the case of using a holding member made of studs, screws, or soldered metal plates, the area occupied by the holding member is smaller, so components and circuits can be mounted on the surface of the printed wiring board with high density. .

(b) Therefore, devices consisting of a certain number of parts or circuits can be downsized.

(c) Inspection and removal of the printed wiring board are easy.

(d) The side plates, joints, bottom plate, etc. of the holding member can be used as efficient heat sinks for three-terminal elements such as thyristors and other high-power elements.

(e) If the holding member is made of a metal plate, it is possible to provide a certain limit of shielding effect against electromagnetic waves.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the controller, Fig. 2 is a schematic sectional view thereof, Fig. 3 is an exploded perspective view of main parts of the holding structure for the printed wiring board, Fig. 4 is a partially cutaway plan view thereof, and Fig. 5 The figure is a partially cutaway side view. 1... Display/adjustment unit, 2... Cylindrical case, 3... Terminal board unit, 4... Transformer, 5...
...Plate member, 5a... Notch, 6... Terminal hardware,
7... Input/output connector, 8... Holding member, 8a...
...Parallel side plate, 8b...Connection part, 8c...Hook part, 8
d...notch, 8e...guide section, 8f...bottom plate,
8g...ventilation hole, 8h...recessed part, 8m...parallel edge, 8n...U-shaped edge, 9...printed wiring board,
9a...Protrusion, 10...Internal connector, 11...
Three-terminal element, 12...circuit element.

Claims (1)

[Scope of utility model registration request] A structure in which a printed wiring board is held in parallel with a plate-like member to which a cylindrical case is detachably attached, which includes a notch on the periphery of the plate-like member, two parallel side plates, and a connecting part between both parallel side plates. a holding member having a U-shaped cross section;
a hook portion integrally formed on the edge of the holding member opposite to the connecting portion so as to fit into the notch of the plate-like member; and a hook portion of the parallel side plate so as to engage with the protrusion of the printed wiring board. a pair of holding parts formed on opposing surfaces, the holding part holds the printed wiring board in parallel with the connecting part, and the holding member has a U-shape that is locked to the plate-like member. A holding structure for a printed wiring board, in which a shaped edge is engaged with an inner surface of the cylindrical case when the cylindrical case is attached.