JPS583330Y2 - Printed circuit board positioning device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a positioning device for a printed circuit board inside various electronic devices, for example, and in particular, a hole punched in the thickness direction of a chassis or other metal plate is provided. This invention relates to an improvement in which the insertion portion of the printed circuit board is inserted into the hole from the side in the thickness direction of the metal plate for positioning.

FIG. 1 shows a conventional example of the above-mentioned device, in which numeral 1 indicates a printed circuit board and numeral 2 indicates a chassis made of sheet metal.

For example, a pair of recesses 3, which are insertion parts, are formed at one end of the printed circuit board 2, and a slit 4, which is a type of a pair of holes, into which the protrusion 3 can be inserted, is formed in the chassis 2.

The printed circuit board 1 is positioned by inserting the printed circuit board 2 into the pair of slits 4 of the chassis 2 from the sides in the thickness direction of the chassis 2 using the pair of protrusions 3.

However, in this case, the slit 4 of the chassis 2 is usually punched (pressed), but the thickness t1 of the printed circuit board 1 is usually set at 1.6 mm, and the thickness t2 of the chassis 2 is Since the width is usually 1rILrft, it is extremely easy to punch out the slit 4 having a narrow width corresponding to t.

In other words, when punching slits into a metal plate, the maximum diameter of the slit is usually up to the thickness of the metal plate.
If the thickness of the plate is larger than the width of the slit, that is, if the width of the 4 slits is smaller than the thickness of the plate, a narrower punching blade (male type) will be used to punch out a thick metal plate, so the strength of the punching blade will be increased. The punching blade is easily damaged due to insufficient amount of metal, making it difficult to perform punching.

By the way, when using a transistor that requires heat dissipation, a heat sink is always required.

Therefore, a flat heat sink is used, the pair of slits 4 are punched into the heat sink, and the pair of protrusions 3 of the printed circuit board 1 are inserted therein.
One possible method is to use this heat sink as a substitute for the chassis 2 described above.

However, the heat sink is made of an aluminum plate with good thermal conductivity, and in order to select a thick plate thickness of, for example, 3 peaks in consideration of heat capacity, it is not possible to punch out the very narrow slits 4 in the heat sink as described above. However, as mentioned above, it is difficult due to the strength of the mold, and there is no practical problem.

7tr molding υn kneer or cutting jM1 upper etc. 1
Although it is easy to form the thin slits 4 in a thick heat sink as shown in Section 2, if such an addition method is used (1i=J t, ), the cost of adding the heat sink will be significant. It becomes expensive, which also lacks practicality.

The fourth invention was devised in view of the above-mentioned actual situation, in which a hole is punched out in the thickness direction of the metal plate, and -f- is inserted into the hole. In a printed circuit board positioning device that inserts and positions the insertion part of the printed circuit board from the side in the board thickness direction, the hole has a width at "muj" of the board thickness of the insertion part of the printed circuit board to be inserted. A part of the corner of the hole that is approximately equal to or larger than the thickness of the metal plate L (at least 11 sloped parts narrowing the inside in the plane direction of the metal plate) The present invention is characterized in that the printed circuit board is positioned by engaging the corner of the insertion portion of the printed circuit board with the intermediate portion or the end portion of the inclined portion.

With this configuration, it is possible to position the printed circuit board by using a metal plate that is thicker than the printed circuit board, and by punching the metal plate to easily form the above-mentioned holes. Become a good one.

An embodiment in which the present invention is applied to a device for positioning a printed circuit board using a neat sink will be described below with reference to the drawings.

2 to 6 show the first embodiment, in which a pair of convex portions 8, which are insertion portions of the invention, are provided on one end side of a printed circuit board 7.

Note that the board thickness 11 of this printed circuit board 7 is 1.6 mm.

Reference numeral 9 denotes a flat heat sink that attaches to the conventional chassis 2 shown in FIG.

This heat sink 9 is made of an aluminum plate and is normally subjected to a pulling force "E".

The heat sink 9 has a thickness t3 of 3 mm, which is approximately twice the thickness t1 of the printed circuit board γ.

Note that the lower end 9a of this heat sink 9 is bent into a 7-shaped shape.

Reference numeral 10 denotes a pair of holes formed in the heat sink 9 by punching and pressurizing the heat sink 9 in the thickness direction, and inside the pair of holes 10; ~
The substrate 7 is configured to be inserted and positioned by the pair of protrusions 8.

At this time, the pair of holes 10 are machined into a shape as clearly shown in FIG.

That is, this hole 10 is a long hole, and the length 11 of the hole 10 is approximately equal to the length 12 of the convex portion 8.

On the other hand, the width t4 in the thickness direction of the convex portion 8 into which the hole 10 is inserted is approximately equal to or sufficiently larger than the thickness t3 of the heat sink 9.

The corner portions 10a at both ends of this hole 10 are
``j] A pair of upper and lower tapered surfaces 11 that narrow t 4 in the surface direction of the heat sink 9 are inclined portions in the present invention.
is formed.

At both ends of this hole 10, the lower width -L of the vertical surface 12 connecting each pair of tapered surfaces 11 under the letter Z is approximately equal to the thickness t1 of the printed circuit board 7.

However, as shown in FIG. When punching, the width of the punching blade can be made thicker, no problem arises regarding the strength of the mold, and the hole 10 can be punched into the cylinder.

According to the above structure, as clearly shown in FIGS. 5 and 6, when the printed circuit board 7 is inserted into the hole 10 of the heat sink 9 using the convex portion 8, the convex portion Tapered surfaces 11 at both ends of the vertical surface 12 of the hole 10 at the upper and lower corner corners 13 at both ends in 8.
It will be positioned by engaging with the end of the.

In the figure, reference numeral 15 indicates a cabinet bottom plate of an electronic device, and the bee 1 to sink 9 are placed on this cabinet bottom plate i 5 , . . . , JT.

And screw insertion holes 1 formed in the cabinet bottom plate 15
The heat sink 9 is screwed to the cabinet bottom plate 15-1 by means of a set screw 18 which is inserted into the screw hole 17 formed in the lower end 9a of the heat sink 9 from the bottom end 9a of the heat sink 9. As clearly shown in , if the set screw 18 is inserted into the screw insertion hole 20 of the rubber foot 19 of the electronic device and the rubber foot 19 is configured to be collinear,
It is convenient that the single screw 18 can be used for fixing the heat sink 9 and the rubber feet 19.

The other end of the printed circuit board 7 is inserted from above into a hole 21 formed in the printed circuit board 7, and is screwed with a regular screw 23 screwed into a screw tightening boss 22 provided on the cabinet bottom plate 15. has been done.

Further, in the figure, 24 is a transistor that requires heat dissipation and is attached to the upper surface of one end side of the printed circuit board 7,
This transistor 24 is closely attached to the side surface of the heat sink 9 via an insulating sheet 25, and is formed in the heat sink 9 by passing through screw insertion holes 26 and 27 formed in the heat sink 24a and the insulating sheet 25 of this transistor 24. The heat sink 9 is closely fixed to the side surface of the heat sink 9 by a set screw 29 screwed into a screw hole 28.

As described above, if the printed circuit board 7 is positioned using the heat sink 9 in which the hole 10 having a sufficiently large width t1 is punched, the heat sink 9 can be used as a substitute for the conventional chassis for positioning the printed circuit board. It is very convenient to be able to do so.

7 and 8 show a second embodiment,
In this case, the upper and lower middle portions 15 of the vertical surfaces 12 at both ends of the hole 10 of the heat sink 9 are configured to be smaller than the board thickness t1 of the printed circuit board 7, while both end surfaces of the convex portions 8 of the printed circuit board 7 are tapered. It is constructed on the surface 31.

However, in this case, when inserting the protrusion 8 of the printed circuit board 7 into the hole 10 of the heat sink 9, make sure to insert it sufficiently so that the corner 32 of both tapered surfaces 31 of the protrusion 8 is aligned with the tapered surface of the hole 10. The hole 10 and the convex portion 8 are pressed by the middle part of the hole 11 in a wedge-like manner.
Even if the processing accuracy is low, the printed circuit board 7 can be firmly positioned without any wobbling, which is very convenient.

FIG. 9 shows a third embodiment, in which the hole 10 is formed in a circular shape, and the printed circuit board 7 is supported by the inner tapered surface 34 made of a smooth curve. It is configured for positioning.

Although the embodiments of the present invention have been described above, the shape of the hole provided in the metal plate referred to in the present invention is not limited to that shown in the embodiments, and can be changed to various other shapes.
In short, the hole may have any shape as long as it has a tapered surface or a surface similar to this.

As described above, the present invention includes at least one inclined portion that narrows the width in the surface direction of the metal plate that is approximately equal to or larger than the thickness of the metal plate in the thickness direction of the insertion portion of the printed circuit board to be inserted. A hole formed in a part of the corner is punched into the metal plate, and the corner of the insertion part of the printed circuit board inserted into the hole is engaged with the middle part or the end of the inclined part of the hole. This is for positioning a printed circuit board.

Therefore, for example, by using a metal plate that is thicker than the printed circuit board, such as the heat sink shown in the embodiment, and simply punching out the large holes described above, the positioning of the printed circuit board as described above can be performed. This eliminates the need to form holes in the metal plate by forming or cutting to perform positioning as described above using a metal plate that is thicker than the printed circuit board. It is possible to obtain very convenient products such as extremely easy processing and low cost products.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view illustrating a conventional example. 2 to 9 show embodiments of the present invention, in which FIG. 2 is an exploded perspective view of the first embodiment, FIG. 3 is a perspective view of the same fully assembled state, and FIG. 4 is Fig. 3 IV-f
5 is a sectional view taken along line V-V in FIG. 3, FIG. 6 is a sectional view taken along line Vl-VI in FIG. 5, and FIG. 7 is a sectional view similar to FIG. FIG. 8 is a cross-sectional view taken along the line ■--■ in FIG. 7, and FIG. 9 is a cross-sectional view similar to FIG. 5 in the third embodiment. Further, in the reference numerals used in the drawings, 7 is a printed circuit board, 8 is a convex portion, 9 is a heat sink, 10 is a hole, 11 is a tapered surface, and 13 is a corner of the printed circuit board.

Claims (1)

[Scope of utility model registration request] In the printed circuit board positioning device, a hole is punched in the direction of the thickness of the metal plate, and an insertion portion of the printed circuit board is inserted into the hole from the side of the metal plate substantially in the direction of plate thickness for positioning. The width of the hole in the thickness direction of the insertion part of the printed circuit board to be inserted is approximately equal to or larger than the thickness of the metal plate, and the width is set at a part of the corner of the hole. At least one inclined portion narrowing in the plane direction of the board is formed, and the printed circuit board is positioned by engaging a corner of the insertion portion of the printed circuit board with an intermediate portion of the inclined portion or an end thereof. A printed circuit board positioning device characterized by: