JPS60216517A - Power supply device - Google Patents

Abstract

PURPOSE:To combine a case and a cover positively by forming a frame-shaped section at the bottom end of a projection when a transformer and a rectifying circuit part are housed in the case, an upper surface thereof is opened, the case is covered with the cover with the projection, which is projected to the inside and to which a resin injection hole is shaped, and a resin is encapsulated. CONSTITUTION:A transformer 12 and rectifying circuit parts 13 consisting of a diode and a capacitor are housed in a case 11, which is composed of a synthetic resin, etc. and an upper surface thereof is opened, and an input card wire 14 and an output card wire 15 fitted to these transformer and rectifying circuit parts are each penetrated to bushings 16 and lead out to the outside. The case is covered with a cover 17, to which two projections 18, lower surfaces thereof have resin injection holes 19, are formed, and a resin is poured into the case 11 and cured, but frame-shaped sections 20 are shaped previously at the bottom ends of the projections 18 at that time. Accordingly, the generation of external stress at a time when the injection resin is cured is reduced by the presence of the frame-shaped sections 20, and the case 11 and the cover 17 are combined positively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device used for supplying power to electronic equipment such as audio equipment.

Conventional configurations and their problems Recently, more and more audio equipment and the like have adopted a two-power-blade type configuration, that is, a configuration in which a DC power source and an AC power source using an AC adapter can be used together.

Such a power supply device called an AC adapter has conventionally been configured as shown in FIG. 1. That is, a transformer 2. Components 3 constituting a rectifier circuit such as diodes and capacitors are housed in the case 1, and a feed protrusion 6 having a screw hole 4 is provided upright within the case 1, and an input lead wire 6. Output lead wire 7
, fill the case 1 with casting resin, fix the transformer 2 and parts 3, cover the case 1 with the cover 8, fit the screws 10 into the through holes 9 of the cover 8, and tighten the coupling protrusion of the case 1. It was assembled by screwing into the screw hole 4 of 6.

With this configuration, it is necessary to tighten the screws 10 to assemble the cover 8 into the case 1, which takes time and effort, and there are many components, which is disadvantageous in terms of cost. There were many problems, such as the need to be careful not to block the mold resin.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide an inexpensive power supply device that has a small number of components, is easy to assemble, and is easy to assemble.

Structure of the Invention In order to achieve the above object, the power supply device of the present invention houses components constituting a transformer and a rectifier circuit in a case,
A cover having a protrusion projecting inward and having a resin injection hole in the center and having a frame-like portion at the lower end is placed over the opening of the case, and the injection material is injected into the case through the resin injection hole of the cover. The structure is filled with a mold resin, and by using this structure, the protrusions of the cover are also fixed by the hardening of the mold resin, so that the case and the cover can be made into seven pieces.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3 of the drawings.

First, in FIG. 2, reference numeral 11 is a top-open case made of an insulator such as synthetic resin, and a transformer 12 and components 13 constituting a rectifier circuit such as diodes and capacitors are housed inside the case 11. Moreover, the input card line 14. An output card wire 16 is led out through the bushing 16.

Such a case 11 is covered with a cover 17 as shown in FIG. This cover 17 is molded from an insulating material such as synthetic resin, and is provided with two protrusions 18 that project downward. This protrusion 18 has a resin injection hole 19 formed in the center thereof, and a frame-shaped portion 20 is formed at the lower end of the protrusion 18 .

This cover 17 is attached to the case 11 such as the transformer 12 and parts 1.
3, the cover 17 is placed over the opening of the case 11, and Matsue type resin 21 is injected through the resin injection hole 19 of this cover 17 to harden the casting resin 21, and the transformer 12 and parts 13 are fixed and the case 11 is closed. 11 and the cover 17 are also connected at the same time. At this time, the frame-shaped portion 20Ii at the tip of the protrusion 18 is embedded in the casting resin 21, and is effective because it does not easily come off even if an external force is applied to the cover 17.

Effects of the Invention As described above, the power supply device of the present invention uses a cover having a resin injection hole in the center and a protrusion with a frame-shaped portion at the lower end, and after covering the case, molding is carried out through the resin injection hole. By injecting and curing the resin, the case and cover can be bonded together. During assembly, no external stress is applied to the case or cover, and the case and cover are not damaged. It has great practical value as it has a large capacity, has a small number of components, is easy to assemble, and is advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a conventional power supply device, Fig. 2 is a perspective view of essential parts showing an embodiment of the power supply device of the present invention, and Fig. 3 is a perspective view of the cover. ···Case,
12...Transformer, 13...Parts, 1
4...Input lead wire, 16...Output lead wire, 16...Bushing, 17...
・Cover, 18...Protrusion, 19...Resin injection hole, 20...Frame-shaped part, 21...
Casting resin. Name of agent: Patent attorney Toshi Nakao (1st person)
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Claims (1)

[Claims] The parts constituting the transformer and the rectifier circuit are housed in a case, and the opening of the case is covered with a cover that has a protrusion that protrudes inward and has a resin injection hole in the center, and has a frame-shaped part at the bottom end. , a power supply device in which the case is filled with casting resin injected from the resin injection hole of the cover;