JP2521712Y2 - Case mounting structure of metal substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a power supply device using a metal substrate as a substrate on which circuit components are mounted.

(Prior Art) FIG. 9 shows a conventional case mounting structure of a substrate, in which an edge of a substrate 3B is fitted into a groove-shaped locking portion 2 provided on an inner surface of an opening edge of a resin case 1. Thus, the case 1 was mounted on the board 3B. In the drawing, reference numeral 4 denotes the substrate 3B and the case 1
Is a device-side printed board on which a device (for example, a power supply device) is mounted. The board 3B is combined with the mounting surface of the circuit component 6 facing the inside of the case 1 and attached to the printed board 4 together with the case 1.

(Problems to be solved by the invention) However, in the above-described conventional structure, the opening edge of the case 1 protrudes from the surface of the substrate 3B on the side opposite to the case by the height indicated by H1, so that it is difficult to reduce the thickness and size. There was a problem.

Further, since there is the protruding portion 9 on the edge, when the heat radiating plate 8 is attached, the radiator 8
Cannot be mounted, and in order to achieve a sufficient heat radiation effect, a high height H2 must be used, and this also has been an obstacle to thinning.

In view of the above problems, an object of the present invention is to provide a power supply device having a case mounting structure of a metal substrate that can achieve a reduction in thickness and size.

(Means for Solving the Problems) In order to achieve this object, the present invention locks the edge of the metal substrate with a locking portion provided at the edge of the case opening,
In a power supply device in which a metal substrate is mounted on a case, a stepped recess is formed in a part of an edge of a plate surface outside the metal substrate, and a part of the stepped recess is formed outside of the edge. A step is formed inside the side wall of the case, and the opening edge side has a thinner cross section and the base side has a thicker cross section, and a locking piece is formed at the opening edge. Then, the distance from the locking portion of the locking piece to the front end of the case opening is set to be the same as or smaller than the depth of the stepped recess, and the projecting piece is formed between the locking piece and the stepped portion. The stepped concave portion is sandwiched therebetween so that the opening edge of the case does not protrude from the outer surface of the metal substrate, and a radiator is attached to the outer surface of the metal substrate.

In the present invention, the locking piece is formed in a short small protrusion shape, while the end surface of the stepped recess forming portion provided on the metal substrate is formed on the same surface as the end surface of the metal substrate, and inside the stepped recess, It is more preferable to fit the locking piece and to form a structure in which the thinned portion is formed between the locking piece and the step portion by forming the stepped concave portion, from the viewpoint of miniaturization.

Further, by forming the step recess by plastic deformation of the metal substrate, the formation of the step recess is facilitated.

Further, by forming the inclined surface for press-fitting the metal substrate on the inner surface of the opening edge of the case, the metal substrate can be easily fitted to the case by pressing the metal substrate into the case.

(Operation) In the present invention, a stepped recess is formed in a part of the edge of the outer surface of the metal substrate, and the portion formed with the stepped recess is provided with a stepped portion provided on the opening edge side of the inner wall of the case, and a locking portion. Since the dimension between the locking portion and the opening end of the case is set to be equal to or less than the depth of the stepped recess, in a state where the metal substrate is combined with the case, the opening edge of the case is made of metal. It will be flush or concave with the outer surface of the substrate and will not protrude. Therefore, when the radiator is mounted on the metal substrate, a radiator having a large radiating area extending beyond the surface of the opening edge of the case can be mounted.

(Embodiment) FIGS. 1 to 5 show an embodiment of the present invention. Second
The figure is an exploded perspective view showing the entire configuration, and shows a resin case 1 of the present example in the form of a rectangular box having a bottom 15 inside two opposing side walls forming an opening edge.
The opening edge side has a thin section and the base side has a stepped portion 18 having a thick section, and a locking piece 2 having a locking portion 2a at the edge of the opening is formed. The step portion 12 is also formed inside the side wall at the same height as the step portion 18. On the other hand, the metal substrate 3 has the case 1
A plurality of stepped recesses 16 are formed on the edges corresponding to the edges provided with the locking pieces 2, respectively, and a part thereof is formed as a protruding piece 10.

As shown in FIG. 3, these stepped concave portions 16 are formed by pressing a part a of the edge of the metal substrate 3 from the surface on the side opposite to the case, that is, the outer plate surface (outer surface) by the mold 13.
As shown in FIG. 1 and FIG. 4, it is formed in a stepped shape recessed from the plate surface. H3 in FIG. 1 indicates the protruding piece 10 and the metal substrate 3
5 shows a step with respect to the outer surface 7 of FIG. Here, the distance H4 from the locking portion 2a to the edge of the case opening edge is set equal to or smaller than the step H3 (H4 ≦ H3). Although the step between the outer surface 7 of the metal substrate 3 and the stepped recess 16 is depicted as a vertical step in the drawing, it may be an inclined step. In addition, the case 1 has an inclined surface 11 formed on the inner surface of the edge where the locking piece 2 is provided, from the tip of the edge to the locking portion 2a.

This metal substrate 3 is, as shown in FIG.
The case 1 is pushed open while the projecting piece 10 is rubbed against the inclined surface 11 of the case 1, and the stepped recess 16 is sandwiched between the locking piece 2 and the stepped part 18 via the projecting piece 10. Also,
The other two sides of the metal substrate 3 are brought into contact with the steps 12 on the other two opposite sides of the case 1.

With such a structure, the open end of the case 1 does not protrude from the outer surface of the metal substrate 3 as shown in FIG.
It is possible to reduce the thickness and size. Further, as shown in FIG. 1, when the radiator 8 is mounted on the outer surface of the metal substrate 1, the radiator 8 can be mounted in a form having a larger area than the metal substrate 3 over the opening edge of the case 1. Therefore, a radiator 8 having a large radiating area and good heat radiation performance can be attached. As a result, a thin radiator having a small thickness H2 can be used, and a reduction in thickness and size can be achieved.

As shown in FIG. 2, the present invention does not include the bottom 15 of the case 1 or the square case 1 without the side wall 1A as shown in FIG. Also, it can be applied to the U-shaped case 1B. In the example of FIGS. 6 and 7, instead of press-fitting the projecting pieces 10 at both ends of the metal substrate 3A from above in the drawing, as shown by the arrow b, the locking piece 2 and the stepped portion 8 It can also be mounted by sliding along.

FIGS. 8A and 8B show another embodiment of the present invention.
In the present embodiment, the shape in which a part of the stepped recess 16 is not projected, that is, the end face 16a of the formation portion of the stepped recess 16 is formed on the same surface as the end face 3x of the metal substrate 3, and the case 1 has the stepped recess 16 or less. Forming a locking piece 17 and a step 18 having a length of
17 is formed in the shape of a short small projection, and the stepped portion 18 is formed over substantially the entire length of the opening edge.
And the metal substrate 3 is fixed to the case 1 with the stepped recess 16 sandwiched between the locking piece 17 and the stepped portion 18. Also in this embodiment, the interval H4 from the locking portion 2a to the end of the case opening edge is set to be equal to or smaller than the step H3 (H4 ≦ H3).

According to the present embodiment, the engaging piece 17 fits into the stepped recess 16 so that the projecting piece 10 of the stepped recess 16 becomes the stepped portion 18 as in the embodiment shown in FIGS. Compared to a structure sandwiched between the case 1 and the locking portion 2a, the side wall of the case 1 and the end face 3x of the metal substrate 3 are installed closer to each other, so that the case 1 can be downsized and the power supply device can be downsized.

(Effect of the Invention) According to the structure of claim 1, a stepped recess having a projecting piece is formed at a part of the edge of the metal substrate, and the locking piece provided with the stepped recess in the case via the projecting piece. The structure is such that the edge of the case does not protrude from the surface of the substrate on the side opposite to the case by being sandwiched between the step portions, so that the power supply device, which is a combination of the metal substrate and the case, can be made thinner and smaller. Becomes

In addition, since the radiator mounted on the outer surface of the metal substrate can be mounted in a form that covers a larger area than the metal substrate over the opening edge of the case, a radiator with a large radiating area and good heat radiation performance can be mounted. As a result, a thinner one can be used, and a reduction in thickness and size can also be achieved.

In claim 2, the end face of the stepped recess forming portion is formed so as not to protrude from the end face of the metal substrate, and the case has a locking piece having a length equal to or less than the stepped recess, and the locking piece has Since the structure fits into the stepped recess, the side wall of the case and the end face of the metal substrate are installed close to each other, and the power supply device can be downsized.

According to the third aspect, since the step recess is formed by plastic deformation of the metal substrate, the step recess can be easily formed.

According to the fourth aspect, since the inclined surface is formed in a portion reaching the locking portion of the case, the case can be easily attached to the metal substrate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a power supply device using a metal substrate according to the present invention, FIG. 2 is an exploded perspective view of the embodiment, and FIG. 3 shows a process of forming a projecting piece in the embodiment. FIG. 4 is an exploded perspective view showing the structure of the embodiment, FIG. 5 is a cross-sectional view showing a fitting step between the projecting piece and the locking portion in the embodiment, FIG. 6 and FIG. FIG. 8 (A) is an exploded perspective view showing another embodiment of the present invention, FIG. 8 (B) is a sectional view thereof, and FIG. 9 is a conventional metal substrate. It is sectional drawing which shows a case mounting structure. 1, 1A, 1B: case, 2: locking piece, 2a: locking portion, 3, 3A: metal board, 3x: end face of metal board, 8: radiator, 10: projecting piece, 1
1: sloped surface, 12, 18: stepped portion, 16: stepped concave portion, 16a: end surface of stepped concave portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshitoshi Fukuhara 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) References Real opening 57-186085 (JP, U) Real opening Akira 57-71390 (JP, U) Actually open 63-95296 (JP, U)

Claims (4)

(57) [Scope of request for utility model registration] In a power supply device in which a metal substrate is mounted on a case by locking an edge of the metal substrate to a locking portion provided at an edge of a case opening, a part of an edge of a plate surface outside the metal substrate is provided. A stepped recess formed from the plate surface is formed, and a part of the stepped recess is formed as a protruding piece that protrudes outward from the edge. Forming a step portion having a base portion side having a thick cross-section, forming a locking piece at the edge of the opening, and adjusting the distance from the locking portion of the locking piece to the tip of the case opening,
By setting the dimension to be the same as or smaller than the depth of the stepped recess, and by clamping the stepped recess between the locking piece and the stepped portion via the protruding piece, the opening edge of the case is formed of the metal substrate. A power supply device using a metal substrate, wherein the power supply device has a structure not protruding from an outer surface of the metal substrate, and a radiator is attached to an outer surface of the metal substrate. 2. A power supply device in which a metal substrate is mounted on a case by locking an edge of the metal substrate to a locking portion provided at an edge of a case opening. In addition to forming a stepped recess recessed from the plate surface, an end surface of a formation portion of the stepped recess is formed in a shape that does not protrude from an end surface of the metal substrate, and an opening edge side of the inside of the side wall of the case has a thin section. Forming a step portion having a base portion side having a thick cross section, and forming a short small protrusion-shaped locking piece at the edge of the opening, and increasing the distance from the locking portion of the locking piece to the tip of the case opening,
The depth is set to be the same as or smaller than the depth of the stepped recess. The locking piece is fitted into the stepped recess, and the thinned portion is formed by forming the stepped recess with the locking piece. A power supply device using a metal substrate, wherein the power supply device is sandwiched between the metal substrate and a radiator mounted on an outer surface of the metal substrate. 3. The power supply device using a metal substrate according to claim 1, wherein the stepped recess is formed by plastic deformation of the metal substrate. 4. The metal substrate according to claim 1, wherein an inclined surface is formed on the inner surface of the opening edge of the case from the tip of the opening edge to the locking portion. Power supply.