JPH0744055Y2 - Printed circuit board holding structure - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a printed circuit board holding structure for an electric device, and holds a printed circuit board by securely insulating a conductive foil of a printed circuit board and an electronic component terminal from a conductive case. It was made possible.

(Prior Art) In many cases, a printed circuit board on which various electronic parts are printed and printed is housed in a case. In this case, however, the case is formed of a conductive material in order to use the case itself as ground. This is common, and therefore it is necessary to insulate between the copper foil of the printed circuit board or the electronic component terminal and the case. However, conventionally, as shown in FIGS. 11 and 12, a cut-and-raised piece 3 is provided on the bottom plate 2 of the case 1, a printed circuit board 4 is placed on the cut-and-raised piece 3, and the cut-and-raised piece 3 is attached to the case 1. The cut-and-raised pieces 3 are provided by the cut-and-raised pieces 7 provided on the side plates 5 and 6.
The electronic components were insulated from each other between the bottom plate 2 and the printed circuit board 4 by the cut-and-raised pieces 3 while pressing and fixing.

(Problems to be solved by the invention) Therefore, since the cut-and-raised piece 3 is a part of the case 1 and has conductivity, insulation is also required between the cut-and-raised piece 3 and the printed circuit board 4. , Insulation became insufficient. Even if insulating paper is interposed in this portion, the insulating paper is easily broken by the cut-and-raised pieces 3, so that the cut-and-raised pieces 3 are cut as shown in FIG.
And a sufficient insulation distance 1 must be secured between the copper foil 9 and
Therefore, the degree of freedom in design is reduced, and the arrangement of the electronic components 8 is also hindered.

In view of the above problems, the present invention can surely insulate the conductive case from the conductive foil of the printed circuit board and the terminals of the electronic component, and also reduces the restrictions on the arrangement of the electronic component.

(Means for Solving the Problems) The technical means of the present invention for solving this technical problem is to mount a printed circuit board 33 on which various electronic parts are printed and printed on a bottom plate 16.
In a conductive case 15 having a pair of side plates 17 and a pair of side plates 17, in an electric device housed in the printed circuit board 33 with the conductive foil 46 side facing the bottom plate 16, both ends in the longitudinal direction of the conductive case 15, A pair of insulative printed circuit board fixing bases 19 are provided so as to close both end openings of the conductive case 15, and each printed circuit board fixing base has a groove-shaped engaging portion 22 in the width direction of the conductive case 15. A pair of locking portions 34, which are notched in a U-shape, are provided on both sides in the width direction of both ends in the longitudinal direction of the printed circuit board 33. The printed circuit board 33 is engaged with the groove-shaped engaging portion 22 of the printed circuit board fixing base 19 so as to be immovable in the vertical direction, the longitudinal direction and the width direction, and the printed circuit board 33 is fixed to the bottom plate of the conductive case 15. Conductive case 15 so that it floats above 16
The protruding piece 23 that comes into contact with the bottom plate 16 is provided on each of the printed circuit board fixing bases 19.

(Function) Both ends in the longitudinal direction of the printed circuit board 33 are the printed circuit board fixing base.
By being engaged with the engaging portion 22 of 19, the printed circuit board 33
Is restricted from moving up and down with respect to the printed circuit board fixing base 19.
Further, the protruding piece 23 of the printed circuit board fixing base 19 is the conductive case 15
By contacting the bottom plate 16 of the
The downward movement of the printed circuit board 33 is reliably controlled, and the printed circuit board 33 is held in a state of floating above the bottom plate 16 of the conductive case 15.
The conductive foil 46 and the electronic component terminals of the printed circuit board 33 are reliably insulated from the conductive case 15.

(Embodiment) The present invention will be described below with reference to the illustrated embodiment.
In FIG. 5 to FIG. 5, reference numeral 15 denotes a conductive case made of a conductive metal plate, which is an elongated rectangular bottom plate 16 and the bottom plate.
A pair of side plates 17 projecting upward from both ends of the width direction 16 are provided in a U shape.

Reference numeral 19 denotes a pair of printed circuit board fixing bases having an insulating property, which is made of synthetic resin or the like, and by engaging the pair of engaging projections 20 with the pair of locking holes 21 of the conductive case 15, the conductive case is formed. The conductive case 15 is provided at both longitudinal ends of the conductive case 15 so as to close the openings at both ends of the conductive case 15. Fixed board for each printed circuit board
The groove 19 is provided with a groove-shaped engaging portion 22, and a pair of projecting pieces 23 is provided so as to project downward.

Reference numeral 26 denotes a lid, which is made of a metal plate or the like, and has a pair of left and right side wall portions 27 fitted onto the upper ends of the side plates 17 of the conductive case 15, and both ends in the longitudinal direction of the stepped portion 28 of the printed board fixing base 19. The engaging protrusion 29 provided on the lid 26 is engaged with the conductive case.
The lid 26 is arranged and fixed so as to close the upper end opening of the conductive case 15 by engaging the locking holes 30 of the cover 15.

33 is a rectangular printed circuit board, and a pair of left and right locking portions 34, which are cut out in a U-shape, are provided at both ends in the longitudinal direction of the printed circuit board 33. Part is engaged with the locking portion 22 of the printed circuit board fixing base 19, whereby the printed circuit board 33 is fixed to the printed circuit board fixing base 19.
Up and down movement is restricted. The protruding piece 23 of the printed circuit board fixing base 19 is the bottom plate 16 of the conductive case 15.
The printed circuit board 33 is in a state of floating above the bottom plate 16 of the conductive case 15 by contacting with, and is arranged between the side plates 17 in parallel with the bottom plate 16.

A transistor 39 and a resistor 4 are provided on the upper surface of the printed circuit board 33.
0,41, capacitors 42,43, electrolytic capacitor 44, transformer 4
Various electronic parts such as 5 are arranged. Printed circuit board 33
A large number of copper foils 46, which are conductive foils for printed wiring of the electronic parts, are arranged on the lower surface of the
Is vertically inserted into the printed circuit board 33 and is soldered 47 to the copper foil 46 on the lower surface of the printed circuit board 33.

8 to 10 show another embodiment, in which the printed circuit board 33
A pair of left and right locking portions 34 formed of circular through holes are provided at both ends in the longitudinal direction of the printed circuit board 33. By using the locking portions 34, both ends of the printed circuit board 33 are shaped like a circumferential groove of the printed circuit board fixing base 19. It is engaged with the engaging portion 22. And the printed board fixing stand
In a state in which the protruding piece 23 of 19 is pressed downward to the bottom plate 16 of the conductive case 15 so that the protruding piece 23 is elastically deformed, the engaging projection 20 of the printed circuit board fixing base 19 is engaged with the locking hole of the conductive case 15. The printed board fixing base 19 is firmly fixed to the conductive case 15 using the elasticity of the protruding piece 23 by engaging with the conductive case 15 so as not to rattle. The other points are the same as those of the above-mentioned embodiment.

Also in the embodiment shown in FIGS. 1 to 7, the elasticity of the protruding piece 23 may be used to firmly fix the printed circuit board fixing base 19 to the conductive case 15.

(Effects of the Invention) According to the present invention, the conductive case 15 is provided at both ends in the longitudinal direction,
A pair of printed circuit board fixing bases 19 having an insulating property is provided, and each locking portion 34 is engaged with the groove-shaped engaging portion 22 of the printed circuit board fixing base 19 so that the printed circuit board 33 cannot move vertically. The printed circuit board 33 to the conductive case.
The protruding pieces 23 that come into contact with the bottom plate 16 of the conductive case 15 so as to float above the bottom plate 16 of the printed circuit board 15 have the above-mentioned printed circuit board fixing bases.
Since it is provided in 19, it is possible to reliably insulate the conductive case 15 and the conductive foil of the printed circuit board 33 and the terminal of the electronic component,
Moreover, since the printed circuit board solid base 19 is insulative, the conductive foil can be freely arranged over substantially the entire area of the printed circuit board 33 while maintaining the above-mentioned insulating state, and therefore, restrictions on the arrangement of electronic components are reduced.

Further, since the pair of printed board solid pedestals 19 are provided so as to close the openings at both ends of the conductive case 15, the pair of printed board solid pedestals 19 are also used as side covers that close the openings at both ends of the conductive case 15. Therefore, the number of constituent members can be reduced accordingly, and the printed circuit board holding structure can be provided with a simple structure and easy manufacturing and at low cost. Moreover, a pair of groove-shaped engaging portions 22 are provided on each printed circuit board solid base 19 so as to face each other in the width direction of the conductive case 15, and both sides in the width direction of both ends in the longitudinal direction of the printed circuit board 33. , A pair of U-shaped notch engaging portions 34 are provided, and the engaging portions 34 are engaged with the recessed groove-like engaging portions 22 of the printed circuit board fixing base 19, respectively. Since the board 33 becomes immovable in the up-down direction, the longitudinal direction, and the width direction, the locking portion 34 and the engaging portion 22 prevent the printed circuit board 33 from moving.
The 33 can be securely and firmly attached to the conductive case 15 with a very simple structure, and its practical effect is remarkable.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a side view, FIG. 3 is a front view, and FIG. 4 is AA of FIG. 5 is a side sectional view, FIG. 6 is a sectional view taken along line BB in FIG. 2, and FIG. 7 is a sectional view taken along line CC in FIG. 8 to 10 show another embodiment,
FIG. 8 is a front sectional view, FIG. 9 is a front view of a side cover, and FIG.
The figure is a perspective view of a printed circuit board. FIG. 11 is a side sectional view showing a conventional example, FIG. 12 is a sectional view taken along the line DD of FIG. 11, and FIG. 13 is a sectional view taken along the line EE of FIG. 15 …… conductive case, 16 …… bottom plate, 17 …… side plate, 19 ……
Printed circuit board fixing base, 22 ... Engaging portion, 23 ... Projecting piece, 33
……Printed board.

Claims (1)

[Scope of utility model registration request] 1. A printed circuit board (33) on which various electronic parts are printed and printed is placed in a conductive case (15) having a bottom plate (16) and a pair of side plates (17) in a U-shape.
In an electric device housed in 3) with the conductive foil (46) side facing the bottom plate (16), a pair of insulative printed circuit board fixing bases (19) are provided at the longitudinal ends of the conductive case (15). Conductive case (15)
Each printed circuit board fixing base (19) is provided with a recessed groove-shaped engaging portion (22) so as to face each other in the width direction of the conductive case (15). A pair of U-shaped notch engaging portions (34) are provided on both sides in the width direction of both ends of the printed circuit board (33) in the longitudinal direction, and each engaging portion (34) is fixed to the printed circuit board. The printed circuit board (33) is engaged with the recessed groove-shaped engaging portions (22) of the table (19) so as to be immovable in the vertical direction, the longitudinal direction and the width direction, and the printed circuit board (33) is electrically conductive. Piece (23) that abuts on the bottom plate (16) of the conductive case (15) so as to float above the bottom plate (16) of the conductive case (15).
Is provided on each of the printed board fixing bases (19).