JPH0316609Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a type of rechargeable electric shaver in which a transformer used during charging is built into the main body case.

[Conventional technology]

When charging the storage battery built into the main body case, the transformer included in the charging circuit cannot be prevented from generating heat. For this reason, it is necessary to maintain the temperature of the main body case made of synthetic resin below a certain value,
Conventionally, a space for thermal insulation is provided between the inner surface of the main body case and the circumferential surface of the core of the transformer to separate the two.

[Problem that the invention attempts to solve]

However, since the space for heat insulation is provided as described above, the thickness of the main body case becomes large, and there is a problem that the main body case is large and requires a large amount of molding material.

[Means for solving problems]

The present invention brings a part of the circumferential side of the core of the transformer built into the main body case made of synthetic resin into close contact with the inner surface of the main case, and also provides a metal heat sink on the outer surface of the part of the main case that is in close contact with the transformer. The above-mentioned conventional problems have been solved by a structure in which a transformer is attached and the portion of the main body case covered with the heat sink that is in close contact with the transformer is made thinner.

[Effect]

In the rechargeable electric shaver equipped with the above-mentioned solution, the circumferential side of the core of the transformer is brought into close contact with the inner surface of the main body case without any gaps, eliminating the space for heat insulation. The overall size can be made smaller, and the amount of molding material for the main body case can be reduced accordingly. Even though the heat-generating transformer is placed in close contact with the main body case made of synthetic resin, the parts of the main case that are in close contact with the transformer are made thinner, and a heat sink is attached to the outer surface of this part. The heat generated in the heat sink can be conducted to the heat sink through the thin transformer contact portion described above, and can be quickly released from the heat sink into the atmosphere. This allows the temperature of the main body case to be maintained below a certain temperature.

〔Example〕

Reference numeral 1 in the drawings showing an embodiment of the present invention is a main body case, which is formed by combining, for example, a pair of front and rear case members 1a and 1b made of synthetic resin. For example, an outer cutter 2 that protrudes forward is removably attached to the upper part of the main body case 1, and a motor (not shown) that drives an inner cutter that slides on the inner surface of the outer cutter 2 and rotates. Built-in. Furthermore, a printed circuit board 3 is built into the lower part of the main body case 1. A storage battery 4 that supplies power to the motor and a switch 5 that opens and closes the supply of power to the storage battery 4 are attached to the board 3, as well as circuit components for charging the storage battery 4, namely A transformer 6, a rectifier 7, etc. are installed. The switch 5 and the transformer 6 are installed in parallel.

The transformer 3 is for lowering the power supply voltage, and is formed by winding a winding 6b around a core 6a, and the entire outer shape of the core 6a is square. The transformer 6 has one surface of its core 6a brought into close contact with the printed circuit board 3, and a surface opposite to this one surface brought into close contact with, for example, the inner surface of the front case member 1a without any gap, and the one farthest from the switch 5. The other surface of the core 6a is provided in close contact with the inner surface of one side of the front and rear case members 1a and 1b, respectively. In addition, the transformer close contact region 8 corresponding to the transformer 6 in the front case member 1a has an area range of about the same size as the transformer 6, for example, is recessed from the outer surface and is thinner than other regions. It is designed to have better heat conduction.

A heat dissipation plate 9 made of a thin metal plate with good thermal conductivity, such as aluminum alloy, is attached to the outer surface of the transformer close contact portion 8. Although the heat sink 9 has an area about the same size as the transformer 6 in this embodiment, it may have a larger or smaller area. In addition, when attaching this heat dissipation plate 9 through an adhesive, it goes without saying that a thermosetting adhesive is used, and in particular, an adhesive with good thermal conductivity mixed with metal powder is used. It is preferable to use the heat dissipating plate 9, and the heat dissipating plate 9 may be installed at the same time as the molding by setting it in advance in the mold when molding the case member 1a.

Further, the heat dissipation plate 9 may be a simple flat plate, but in the case of this embodiment, the surface area is increased to further improve the heat dissipation performance and to prevent the hand gripping the main body case 1 from slipping when shaving. , a structure in which unevenness is formed at least in part by pressing or the like is used. In addition,
When such unevenness is provided, it may be in the form of a lattice rather than in the shape of a corrugated plate as shown in the figure, or a large number of small protrusions may be provided by embossing.

Further, the case member 1a includes the switch 5.
A switch knob 10 for turning on and off is mounted so as to be slidable, for example, in the vertical direction. Moreover, in the case of this embodiment, a display is located on one side 9a of the heat sink 9 on the switch knob 10 side to indicate the position of the switch 5 (that is, ON, OFF, etc.).
11 is attached by printing etc. In addition, when applying appropriate coloring to the surface of this heat sink 9, the heat sink 9 can also be used as a decorative board. Further, the main body case 1 has a built-in charging plug 12 located below the rectifier 7, and this plug 12 is moved back and forth by operating the knob 12a. The plug blade is designed to be protruded and retracted into the main body case 1. Note that the plug 12 may be omitted, and in that case, one end of the power cord is inserted into the connector provided on the main body case 1 during charging.

In the rechargeable electric shaver with the above configuration,
The front side surface of the core 6a included in the transformer 6 is brought into close surface contact with the inner surface of the front case 1a of the main body case 1 without any gap, and the core 6a and the case member 1a
Since there is no space for thermal insulation between these, the main body case 1
The overall size can be reduced by reducing the thickness T. Therefore, along with this miniaturization, the molding material for the main body case 1 can be reduced, making it possible to reduce costs, and the space required for storage and carrying can also be reduced, which is convenient. Moreover, in this embodiment, one side of the core 6a is also brought into close contact with the inner surfaces of the case members 1a, 1b without any gaps, so that the width W of the main body case 1 can also be sandwiched, making the whole case more compact.

To charge the storage battery 4, the switch 5 is turned OFF, the plastic blade of the plug 12 is made to protrude from the main body case 1, and the plug 12 is inserted into an outlet (not shown). Then, the secondary current generated in the transformer 6 that steps down the power supply voltage is converted into direct current by the rectifier 7, and the storage battery 4 is charged. And when charging, transformer 6
generates fever. However, although the core 6a of the transformer 6 is in close contact with the inner surface of the main body case 1 made of synthetic resin as described above, the transformer contact area 8 of the front case member 1a is made thinner and a heat sink is placed on the outer surface. 9 is attached, the heat of the transformer 6 is quickly conducted to the heat sink 9 on the outer surface of the main body case 1 through the transformer close contact portion 8, and can be quickly released from the heat sink 9 into the atmosphere. As a result, the temperature of the main body case 1 can be maintained at a certain temperature, for example, below the temperature specified in the Electrical Appliance and Material Control Law.

Although the above-mentioned embodiment is applied to a rechargeable electric shaver in which the inner blades are rotated, the present invention can also be implemented in a rechargeable electric shaver in which the inner blades are reciprocated. In implementing the present invention, the specific structure, shape, position, material, etc. of the main body case, transformer contact parts, transformer and its core, heat sink, etc. shall be the same as those described above, unless it contradicts the gist of the invention. It goes without saying that the present invention is not limited to the examples and can be configured and implemented in various ways.

[Effect of idea]

According to the present invention, which has the gist of the configuration described in the above-mentioned utility model registration claims, the transformer and the inner surface of the main body case are brought into close contact, and the problem of heat generation of the transformer due to this closeness is solved, thereby realizing miniaturization. There is a practical effect that it can be done.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a cross-sectional view, FIG. 2 being a partially sectional front view, and FIG. 3 being a front view. 1... Main body case, 6... Transformer, 8... Transformer close area, 9... Heat sink.

Claims (1)

[Scope of utility model registration request] In a rechargeable electric shaver that has a transformer built into a main body case made of synthetic resin, a part of the circumferential side of the core of the transformer is brought into close contact with the inner surface of the main body case, and a metal is attached to the outer surface of the transformer-contacting part of the main body case. A rechargeable electric shaver is equipped with a heat dissipation plate manufactured by the manufacturer, and a portion of the main body case covered with the heat dissipation plate that is in close contact with the transformer is made thinner.