JPS6318225Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speaker holder that also has a heat dissipation function for a power transistor.

The speaker of a portable radio is generally attached to a case or a lid. This is because if the speaker is attached to the printed circuit board side, the installation space for electronic components will be restricted. However, when the speaker is attached to the case or lid, it is difficult to make electrical adjustments, and when the case or lid is placed, the relative position of the electronic components on the printed circuit board cannot be determined, resulting in damage to the electronic components. . Therefore, it is preferable that the speaker can be attached to the printed circuit board side so as not to hinder the attachment of electronic components.

On the other hand, a power transistor is always used in this type of portable radio device, and since this transistor generates a large amount of heat, some kind of heat sink is essential. FIG. 1 is an explanatory diagram of a conventional general heatsink, in which 1 is a power transistor, 2 is a radiator (heatsink), and 3 is a printed circuit board. The radiator 2 is a metal ring with a plurality of heat dissipating fins and a portion cut out, and is attached to the outer periphery of the transistor 1. However, in this heat dissipation structure, since the radiator 2 is bent to the top, there is a drawback that it is easily dislodged due to vibration or shock during transportation. This tendency becomes more pronounced as the radiator 2 is made larger in order to improve heat dissipation efficiency. Further, there is thermal resistance at the contact area between the case of the transistor 1 and the radiator 2, and furthermore, the clamping pressure of the radiator 2 is not uniform, so effective heat radiation cannot be expected.

In order to solve the above-mentioned two problems all at once, this invention allows the speaker to be mounted on the printed circuit board side with almost no hindrance to the arrangement of electronic components, and also efficiently dissipates heat from the power transistor. The present invention provides a speaker holder having a structure that allows good heat dissipation.

The speaker holder of the present invention includes a saucer portion for accommodating the bottom of the speaker, a mounting leg extending substantially perpendicularly from the bottom surface of the saucer portion, and a heat conduction portion for transmitting heat from the power transistor, which are integrally formed of a metal material.
The present invention is characterized in that the mounting legs are screwed to the printed circuit board on which the power transistor is mounted, and this will be explained in detail below with reference to the illustrated embodiments.

2 and 3 are a perspective view and a partially sectional side view showing one embodiment of the present invention, in which 4 is a speaker holder, 5 is a speaker, 6 is a case, 7 is a back cover, and 8 is a various electronic device. It is a part. speaker holder 4
includes a saucer section 41 that accommodates the bottom (drive section) 51 of the speaker 5, a mounting leg 42 extending substantially perpendicularly from the bottom surface, and a heat conduction section 43 that transfers heat from the power transistor 1 to the saucer section 41. , these are integrally formed from a metal material. This speaker holder 4 has its mounting legs 42 screwed 9 (Fig. 3).
It is fixed to the printed circuit board 3 by. The bottom portion 51 of the speaker 5 is covered with an adhesive cushion material 10.
(FIG. 3), it is fixed to the saucer portion 41. In addition, 11
is a copper auxiliary fitting whose one end is screwed to the heat conductive part 43, and the other end is soldered to the upper surface of the case of the transistor 1. This auxiliary metal fitting 11 has an outer shape of the power transistor 1 that corresponds to the oscillation frequency (150MHz band,
This makes it possible to use the same speaker holder 4 even when the frequency changes (400MHz band, etc.). That is, by moving the metal fitting 11, the optimum contact position with the transistor case is achieved. Since the auxiliary metal fitting 11 and the case of the transistor 1 are joined by soldering, the thermal resistance is extremely low.

With the above-described speaker holder of the present invention, the speaker can be attached to the printed circuit board side, so there is no need to damage electronic components when attaching and detaching the case and lid, and adjustment is easy. Further, as a heat sink for a power transistor, the thermal resistance of the junction portion is small, the heat radiation efficiency is high, and it is mechanically stable, so it has the advantage of being resistant to shocks and the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional radiator for a power transistor, and FIGS. 2 and 3 are a perspective view and a partially sectional side view showing an embodiment of the present invention. In the figure, 1 is a power transistor, 3 is a printed circuit board, 4 is a speaker holder, 41 is a saucer part, 42
43 is a heat conducting part, 5 is a speaker, 51 is a bottom thereof, and 9 is a screw.

Claims (1)

[Scope of utility model registration request] A saucer portion that accommodates the bottom of the speaker, a mounting leg that extends substantially perpendicularly from the bottom of the speaker tray, and a heat conduction portion that conducts heat from the power transistor are integrally formed of a metal material, and the mounting leg is connected to the power transistor. A speaker holder characterized by being screwed to a printed circuit board on which a transistor is attached.