JPH10173390A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the thermal radiation effect to the outside by covering one surface of a printed board with a housing, contacting the bottom of the housing to a conductive pattern, and sandwiching the printed board between a frame disposed at the other surface of the board and housing. SOLUTION: A printed board at the side of an apparatus has mounting legs 4f soldered to the board. A housing 1 and cover 4b of a frame 4 form an electric shield in use. Heat on one side of a hot printed board 2 esp. due to the operation of power amplifiers radiates to the outside through a high-thermal conductivity Al housing 1. The heat of the hot printed board 2 due to operation of power amplifiers, etc., conducts peripheral conductive patterns 2b and radiates to the outside through the housing 1 and frame contacts to the patterns 2b, thus enhancing the thermal radiation effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as a radio circuit unit of a mobile telephone, and more particularly to an electronic device having good electric shielding and heat radiation effect.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 0, a housing 30 made of a conductive solderable iron plate includes a box-shaped cover portion 31, a mounting leg 32 extending downward from the cover portion 31, and a bent portion provided on the mounting leg 32. Part 33. Also, the printed circuit board 3
4, an electronic circuit is formed by connecting an electric component (not shown) such as a power amplifier 35 to the circuit pattern (not shown). Then, a power amplifier 35 is attached to the dotted line portion in FIG. 9, and the surface of the printed circuit board 34 to which the power amplifier 35 is attached is covered with the cover 31, and the bent portion 33 of the mounting leg 32 of the housing 30 is attached to the printed circuit board 34. The mounting leg 32 is attached to a conductor 36 on the back side of the set by soldering to a printed circuit board (not shown) on the set side or the like.

[0003]

In the above-mentioned conventional electronic equipment, the housing 30 is formed of an iron plate because of the necessity of electrical shielding and soldering. Therefore, the heat radiating effect of the heat from the power amplifier 35 to the outside through the housing 30 is poor.
For this reason, there is a problem that heat is trapped in the housing 30 and the electric components are damaged. Further, this problem becomes remarkable when the printed circuit board 34 is formed by stacking a plurality of printed circuit boards. Further, the heat of the printed circuit board 34 heated by the power amplifier 35 tends to escape through the conductor 36, but the contact surface of the conductor 34 to the housing 30 is small, so that the heat dissipation of the printed board 34 is insufficient. There was a problem that is. Further, since the back surface of the printed circuit board 34 is in an open state, an electrical shield cannot be obtained.

[0004]

As a first means for solving the above-mentioned problems, a housing made of aluminum, a printed circuit board provided with electric components and having a conductive pattern around one surface, and a solder are provided. A frame made of a metal plate that can be attached to the printed circuit board. The printed circuit board is sandwiched between the frame and the housing. Further, as a second solution, a conductive pattern is provided around the other surface of the printed circuit board, an end of the frame is brought into contact with the conductive pattern, and the frame and the housing are interconnected. Stopped and combined. As a third solution, a tongue is provided on the frame, and the tongue is elastically contacted with a conductive pattern provided around the other surface of the printed circuit board. As a fourth solution, the printed circuit board is configured by stacking a plurality of printed boards. The other surface of the printed circuit board was covered with a cover member.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the electronic equipment shown in FIGS. In this embodiment, the electronic apparatus is a radio circuit unit of a mobile telephone, and a box-shaped casing 1 made of aluminum having good thermal conductivity is provided with a plurality of holes 1b for heat radiation on an upper surface plate 1a. The peripheral side plate 1c is provided with a depression 1e having a projection 1d at an appropriate position. The printed circuit board 2 formed by laminating a plurality of printed circuit boards has a circuit pattern (not shown) formed on one surface and the other surface, and electric components such as the power amplifier 3 (not shown). ) Is connected and attached. In FIG. 2, a power amplifier 7 is attached to a dotted line portion T.

A housing 1 is provided on the side of the printed circuit board 2.
A notch 2a is provided at a position corresponding to the concave portion 1e, and a conductive pattern 2b, which is connected to a circuit pattern and serves as a ground, is
Are formed. And this conductive pattern 2b
It is formed at a position facing the lower part of the side plate 2c of the housing 1.

A frame 4 made of a conductive and solderable metal plate such as an iron plate has a flat cover member 4b having a plurality of holes 4a for heat dissipation, and a cover member 4b extending upward from the periphery of the cover member 4b. The arm 4 d having a concave portion 4 c engaged with the convex portion 1 d of the housing 1 and the conductive pattern 2 b provided on the other surface of the printed board 2 are opposed to each other, and a part thereof is provided around the frame 4. It has a tongue piece 4e having a spring property provided by cutting and raising, and a mounting leg 4f protruding downward.

The housing 1 covers the electric components including the power amplifier 3 mounted on one surface of the printed circuit board 2 so that the lower part of the side plate 1c abuts on the conductive pattern 2b. The arm 4d is inserted into the notch 2a of the printed circuit board 2 and the recess 1e of the housing 1 from the other surface of the printed circuit board 2 so as to cover the other surface of the printed circuit board 2, as shown in FIG. As shown in FIG. 3, the concave portion 4c of the arm portion 4d is locked to the convex portion 1d, and the frame 4 and the housing 1 are locked and combined with each other to sandwich the printed circuit board 2. At this time, as shown in FIGS. 3 and 4, the tongue piece 4e of the frame 4 and its peripheral portion abut on the conductive pattern 2b on the other surface of the printed circuit board 2, and due to the spring property of the tongue piece 4e, The housing 1 is drawn to the printed circuit board 2 side, and the contact between the lower part of the housing 1 and the conductive pattern 2b is strengthened.

The electronic device having such a configuration is mounted on a printed circuit board (not shown) on the set side by soldering its mounting legs 4f. When used, the cover of the housing 1 and the frame 4 is used. Electrical shielding is performed by the member 4b. In particular, heat on one side of the printed circuit board 2 generated by the power amplifier 3 is radiated to the outside through the aluminum housing 1 having good thermal conductivity. The heat of the printed circuit board 2 heated by the amplifier 3 and the like is transmitted to the peripheral conductive pattern 2b, and is radiated to the outside through the housing 1 and the frame 4 which are in contact with the conductive pattern 2b. On the other side of the printed circuit board 2,
Since the electric components that generate relatively little heat are arranged, heat radiation by the frame 4 of the metal plate that can be soldered is sufficient.

FIGS. 5 to 8 show another embodiment of the electronic apparatus of the present invention. Here, the same parts as those of the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the housing 1 made of aluminum includes an upper surface plate 1a having a hole 1b, a side plate 1c, and an arm 1f having a convex portion 1d and projecting downward from the side plate 1c. An electric component such as a power amplifier 3 is attached to the printed circuit board 2, and a notch 2a and a conductive pattern 2b are provided.
Are formed in the same manner as in the above embodiment.

The frame 4 made of a metal plate such as a conductive solderable iron plate is provided with a tongue piece 4e formed by cutting and raising the periphery, a mounting leg 4f, a latch 4g, and a recess. And a sleeve 4j having a sleeve 4h. Further, in this embodiment, the cover member 5 made of an iron plate is formed as a separate member from the frame body 4. The cover member 5 includes a plate-shaped portion 5b having a hole 5a and an arm portion 5d having a convex portion 5c. It has.

The housing 1 covers one surface of the printed circuit board 2 so that the lower part of the side plate 1c is connected to the conductive pattern 2b.
The frame 4 is locked to the arm 1f of the housing 1 from the other surface side of the printed circuit board 2 with the latching portion 4g, and the projection 1d. Then, as shown in FIG.
The tongue piece 4e of the frame 4 and its periphery abut the conductive pattern 2b on the other surface of the printed circuit board 2, and the lower part of the housing 1 is drawn toward the printed circuit board 2 by the spring property of the tongue piece 4e. 1 and the conductive pattern 2b. Next, the cover member 5 is fitted to the frame 4 from the other surface side of the printed circuit board 2, and the convex portion 5 c is set to the concave portion 4 h of the frame 4.
The cover member 5 covers the other surface of the printed circuit board 2.

[0013] In this embodiment as well, the heat radiation function and the shielding function are performed similarly to the above-described embodiment. Further, as in this embodiment, by forming the cover member 5 as a separate member from the frame 4, the cover member 5 can be made of a material such as an iron plate or aluminum if necessary, and a shield is required. If not, it is sufficient that the cover member 5 is removed, and flexibility can be provided.

[0014]

According to the electronic apparatus of the present invention, since the aluminum casing having good heat conductivity is brought into contact with the conductive pattern provided around the printed circuit board, the heat radiation inside the casing is good. In addition, it is possible to radiate the heat of the printed circuit board through the conductive pattern, and to provide an electronic device in which the electric component is not damaged. In addition, by contacting the end of the frame with the conductive pattern provided on the other surface of the printed board, the heat dissipation effect of the printed board can be further improved.
In addition, since the housing and the frame are locked to each other, the mounting of the housing is facilitated, and the housing can be grounded through the frame, so that other components are not required and the configuration is simple. Becomes Also, by providing a tongue piece on the frame,
The contact with the conductive pattern of the housing can be strengthened,
Contact for grounding can be ensured. Also, the use of a printed circuit board formed by laminating a plurality of printed circuit boards requires a large amount of heat radiation, and in such a case,
In particular, a remarkable effect can be exhibited. Further, by using the cover member, a shielding effect and a heat radiation effect on the other surface of the printed circuit board can be obtained, and an electronic device having good performance can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electronic device according to the invention.

FIG. 2 is an exploded perspective view of the electronic device according to the invention.

FIG. 3 relates to an electronic device according to the present invention,
Sectional drawing of the principal part in a line.

FIG. 4 relates to an electronic device according to the present invention,
Sectional drawing of the principal part in a line.

FIG. 5 is a perspective view of an electronic apparatus according to another embodiment of the present invention.

FIG. 6 is an exploded perspective view of an electronic apparatus according to another embodiment of the present invention.

FIG. 7 relates to an electronic apparatus according to another embodiment of the present invention.
FIG. 6 is an essential part cross-sectional view along the line CC in FIG. 5;

FIG. 8 relates to an electronic apparatus according to another embodiment of the present invention.
FIG. 6 is an essential part cross-sectional view along the line DD in FIG. 5;

FIG. 9 is an exploded perspective view of a conventional electronic device.

FIG. 10 is a sectional view of a main part of a conventional electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Top plate 1b Hole 1c Side plate 1d Convex part 1e Depressed part 1f Arm part 2 Printed circuit board 2a Notch part 2b Conductive pattern 3 Power amplifier 4 Frame 4a Hole 4b Cover member 4c Concave part 4d Arm part 4e Tongue piece 4f 4g Latch 4h Concave 4j Sleeve 5 Cover 5a Hole 5b Plate 5c Convex 5d Arm

Claims (5)

[Claims] 1. A printed circuit board comprising: a housing made of aluminum; a printed board provided with an electric component and having a conductive pattern around one surface; and a frame made of a solderable metal plate. While covering the surface with the housing, the lower part of the housing is brought into contact with the conductive pattern, and the printed board is sandwiched between the frame and the housing arranged on the other surface side of the printed board. Electronic equipment characterized. 2. A conductive pattern is provided around the other surface of the printed circuit board, an end of the frame is brought into contact with the conductive pattern, and the frame and the housing are mutually locked and combined. The electronic device according to claim 1, wherein: 3. The frame according to claim 1, wherein a tongue is provided on the frame, and the tongue is elastically contacted with a conductive pattern provided around the other surface of the printed circuit board. Electronics. 4. The electronic apparatus according to claim 1, wherein the printed circuit board is formed by laminating a plurality of printed circuit boards. 5. The printed circuit board according to claim 1, wherein the other surface is covered with a cover member.
Or the electronic device according to 4.