JP2001177267A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem, where the temperature in a case rises due to the heat generated at a power source part and the performance of electronic component mounted on a printed board degrades or its service life is shortened. SOLUTION: In a case 1, comprising an upper case 3 and a lower case 2, a printed board 6 on which electronic components are mounted and a power source part 10 are housed. Here, a rear plate 2d and a bottom plate 2a of the lower case 2 are provided with ventilation ports 2e and 2h, respectively, and the printed board 6 is fitted near the bottom surface of the lower case 2. The power source part 10 is installed near the ventilation port 2e provided at the rear plate 2d, on the printed board 6. The air heated by the power source part 10 is exhausted to the outside of the case 1 through the ventilation port 2e provided near the power source part 10, while the printed board 6 is cooled down by the outside air glowing into the case 1 through the ventilation port 2h provided at the bottom plate 2a. Thus, the performance of electronic component mounted on the printed board 6 is prevented from degraded under heat or the service life is prevented from peing shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device mainly operated on a desk.

[0002]

2. Description of the Related Art Conventionally, as this kind of electronic equipment, for example, those shown in FIGS. 8 and 9 are known.

The conventional electronic device has a lower housing a having an upper surface opened and an upper housing b provided so as to cover the opening of the lower housing a. Is provided with an operation section d on which a plurality of keys c are arranged.

A printed circuit board e on which electronic components (not shown) are mounted and a power supply unit f for supplying power to the printed circuit board e are installed in the lower housing a near the bottom surface. Ventilation holes i formed by a large number of vertically elongated slits are opened in both side plates g and the rear surface plate h of the housing a, and outside air flows into the upper and lower housings b and a from these ventilation holes i. It is configured as follows.

[0005]

However, unlike the above-mentioned conventional electronic equipment, a printed circuit board e is provided near the bottom surface of the lower housing a.
In the case where the power supply unit f and the power supply unit f are arranged side by side, a large amount of space is required to install them and the electronic device becomes large, and when the size of the electronic device is limited, the power supply unit f becomes an obstacle. And a large printed circuit board e cannot be installed.

Heat generated in the power supply unit f during use of the electronic device is cooled by air flowing into the upper and lower housings b and a through the ventilation holes i. The temperature in the bodies b and a rises, and as a result, the performance of heat-sensitive components mounted on the printed circuit board e is deteriorated by heat,
There are also problems such as shortening of the service life early, which impairs the reliability of the electronic device.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has as its object to provide an electronic apparatus which can be easily miniaturized and whose performance of electronic parts is hardly deteriorated by heat. It is.

[0008]

According to the present invention, there is provided an electronic apparatus comprising:
In a housing composed of an upper housing and a lower housing, a printed circuit board on which electronic components are mounted and an electronic device containing a power supply unit, wherein the lower housing has ventilation holes opened in a rear plate and a bottom plate, and A printed circuit board is mounted near the bottom surface of the lower housing, and a power supply unit is installed separately from the printed circuit board near an air hole opened in the rear plate.

With the above structure, the air heated by the heat generated in the power supply unit during use of the electronic device is exhausted from the vent hole opened in the rear plate, and the air inside the housing is opened through the vent hole opened in the bottom plate. The outside air that has flowed into the housing passes through the printed circuit board and flows into the power supply section, so that the inside of the housing does not become hot due to the heat generated by the power supply section. It is possible to prevent the performance from deteriorating and the life of the electronic component from shortening early.

In the electronic apparatus according to the present invention, the front plate of the upper housing is inclined so as to descend forward, and an operation unit is provided in front of the front plate.

According to the above configuration, the operability when the electronic device is placed on the table and the operation section is operated is improved, and the air that has flowed into the housing from the ventilation hole of the bottom plate flows along the lower surface of the front plate. Since it flows to the power supply side and is discharged out of the housing through the ventilation holes in the rear panel, it is possible to efficiently cool the electronic components mounted on the printed circuit board and the power supply unit. The reliability of the electronic device is improved because of reduced reception.

Further, since the power supply unit is provided behind the operation unit provided on the upper surface plate of the upper housing, the operation unit and the power supply unit do not interfere with each other, thereby easily reducing the size of the housing. In addition, since the power supply is installed on the printed circuit board, the printed circuit board can be installed without disturbing the power supply even if the housing is miniaturized. The size can be reduced.

In the electronic device according to the present invention, the vent hole opened in the bottom plate is formed by a plurality of slits and a band provided below these slits.

According to the above configuration, it is possible to prevent foreign matter such as dust from entering the housing through the ventilation hole opened in the bottom plate. Inconveniences such as equipment failure can also be resolved.

[0015]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of an electronic device, FIG. 2 is a perspective view of a state in which a printed circuit board and a power supply unit are installed in a lower housing,
3 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 4 is a perspective view of the lower housing, FIG. 5 is an enlarged view of a circle B in FIG. 4, and FIG.
FIG. 7 is a cross-sectional view taken along a line C-D of FIG. 5.

The housing 1 of the electronic device comprises a lower housing 2 having an open upper surface and an upper housing 3 provided so as to cover the lower housing 2.

The lower housing 2 includes a bottom plate 2a and the bottom plate 2a.
a, a front plate 2c erected at the front end of the bottom plate 2a and a rear plate 2d erected at the rear end of the bottom plate 2a. As shown in FIGS. 2 to 4, it is inclined forward and downward.

The rear housing 2d of the lower housing 2 has a large number of long ventilation holes 2e and mounting holes 2f for mounting connectors and outlets (none of which are shown). , The bottom plate 2a has many slits 2
g of ventilation hole 2h is opened.

The ventilation hole 2h formed by the slit 2g is
It is formed before and after the bottom plate 2a, for example, at three places. These ventilation holes 2h are formed by punching the slits 2g downward by press molding or the like. Below each slit 2g, a strip 2i having the same width as the slit 2g is formed as shown in FIGS. 2g are formed when punching 2g.
A foreign substance such as dust is prevented from entering the inside, and a plurality of legs 4 are attached to the lower surface of the bottom plate 2a. As shown in FIG. 3, a gap 5 is formed between the bottom plate 2a and the tabletop so as not to prevent the outside air from flowing into the housing 1 through the ventilation hole 2h opened in the bottom plate 2a. ing.

On the other hand, a printed circuit board 6 on which electronic components (not shown) are mounted is accommodated in the lower housing 2.

The printed board 6 is formed to be slightly smaller in size than the bottom plate 2a, and is fixed to the upper surface of the bottom plate 2a by a fixing member 8 via a plurality of spacers 7 and on the printed board 6 Is a ventilation hole 2e opened in the rear plate 2d at a position separated from the printed circuit board 6.
The power supply unit 10 is installed at a position close to.

The power supply unit 10 is one in which an electronic component 10b such as a transformer is mounted on a substrate 10a.
A heat radiating plate 10c is provided on the substrate 10a so as to face the air hole 2e opened in the rear plate 2d. The upper surface plate 3a of the upper housing 3 that covers the upper opening of the lower housing 2 is inclined forward and downward along the inclination of the upper edges of both side plates 2b of the lower housing 2.
On the upper surface of the upper housing 3, an operation unit 14 having a plurality of keys 14a for inputting information and the like, a display unit 15 for displaying information such as input results, an output unit 16 for printing various information, and the like are provided. ing.

Next, the operation of the electronic device configured as described above will be described. The electronic device is mounted on a desk or the like for use. At this time, the upper surface plate 3a of the upper housing 3 is inclined forward and downward. Therefore, operability when inputting information from the operation unit 14 is very good.

During use of the electronic device, the electronic component 10 such as a transformer provided in the power supply unit 10 generates heat, and
The inside air is heated, and the heated air moves to the rear plate 2d side along the inclination of the upper plate 3a of the upper housing 3 and passes through the ventilation holes 2e opened in the rear plate 2d. Since the air is discharged to the outside, outside air flows into the housing 1 through the ventilation hole 2h opened in the bottom plate 2d of the lower housing 2.

As a result, an air flow as shown by arrows in FIGS. 2 and 3 is generated in the housing 1, and the electronic components mounted on the printed circuit board 6 are cooled by the air flow. Performance is degraded by heat,
It is possible to prevent the life of the electronic component from being shortened early.

The air passing over the printed circuit board 6 and cooling the electronic components of the printed circuit board 6 cools the power supply unit 10 provided near the ventilation hole 2e of the rear face plate 2d, and then passes through the ventilation hole 2e. As a result, the temperature inside the housing 1 rises due to the heat generated from the power supply unit 10, and the electronic components mounted on the printed circuit board 6 can be prevented from being adversely affected by the heat. In addition, since the power supply unit 10 is provided behind the operation unit 14 provided on the upper surface plate 3a of the upper housing 3, the operation unit 14 and the power supply unit 10 do not interfere with each other. The size can be reduced, and the operation unit 14 is not heated by the power supply unit 10.

[0028]

As has been described in detail above, the present invention provides a housing composed of an upper housing and a lower housing, wherein ventilation holes are respectively opened in the rear plate and the bottom plate of the lower housing, and Since the printed circuit board is mounted near the bottom surface and the power supply section is installed on the printed circuit board near the ventilation hole opened in the rear panel, air heated by heat generated in the power supply section during use of the electronic device. Is discharged from the vent hole opened in the rear plate, and outside air flows into the housing through the vent hole opened in the bottom plate, so that the inside of the housing does not become hot due to heat generated in the power supply unit, Due to this, the performance of heat-sensitive electronic components mounted on the printed circuit board may deteriorate,
It is possible to prevent the life of the electronic component from being shortened early.

Further, since the front panel of the upper casing is inclined so as to descend forward and the operation section is provided on the front side of the front panel, the electronic apparatus can be placed on a table and operated. In addition to the improved operability, the air that has flowed into the housing from the ventilation holes in the bottom plate flows to the power supply side along the lower surface of the front plate, and is discharged out of the housing through the ventilation holes in the rear plate. The electronic components and the power supply unit mounted on the printed circuit board can be efficiently cooled, and thereby the electronic components are less likely to be adversely affected by heat, thereby improving the reliability of the electronic device.

Further, since the power supply unit is provided behind the operation unit provided on the upper plate of the upper housing, the operation unit and the power supply unit do not interfere with each other. In addition, since the power supply is installed on the printed circuit board, the printed circuit board can be installed without disturbing the power supply even if the housing is miniaturized. The size can be reduced.

Further, since the ventilation hole opened in the bottom plate is formed by a plurality of slits and a band-shaped portion provided below these slits, foreign matter such as dust enters the housing through the ventilation hole opened in the bottom plate. Therefore, it is possible to solve the problem that the function of the printed circuit board installed near the bottom plate is impaired by the foreign matter, or the electronic device breaks down due to the foreign matter.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electronic apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a printed circuit board and a power supply unit installed in a lower housing of the electronic device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a perspective view showing a lower housing of the electronic apparatus according to the embodiment of the present invention;

FIG. 5 is an enlarged view in a B circle of FIG. 4;

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a sectional view taken along the line DD of FIG. 5;

FIG. 8 is a perspective view of a conventional electronic device.

FIG. 9 is a perspective view showing a lower housing of a conventional electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Lower case 2a Bottom plate 2b Side plate 2c Front plate 2d Rear plate 2e Vent hole 2f Mounting hole 2g Slit 2h Vent hole 2i Band 3 Upper case 3a Top plate 4 Leg 5 Gap 6 Printed circuit board 7 Spacer 8 Adhesion Fixture 10 Power supply unit 10a Substrate 10b Electronic component 10c Heatsink 11 Spacer 12 Fixture 14 Operation unit 14a Key 15 Display unit 16 Output unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E360 AB03 AB04 AB08 AB09 AB12 BD02 EA13 EA14 EA24 GA24 GA52 GB45 5E322 AA11 BA01 EA11

Claims (3)

[Claims] 1. A housing comprising an upper housing and a lower housing,
In an electronic device containing a printed circuit board on which electronic components are mounted and a power supply unit, vent holes are respectively opened in a rear plate and a bottom plate of the lower housing, and a printed circuit board is mounted near a bottom surface of the lower housing, An electronic device, wherein a power supply unit is installed separately on a printed circuit board near a ventilation hole opened in the rear panel. 2. The electronic apparatus according to claim 1, wherein the front plate of the upper housing is inclined so as to descend forward, and an operation unit is provided on the front side of the front plate. 3. The electronic device according to claim 1, wherein the ventilation hole formed in the bottom plate is formed by a plurality of slits and a band provided below the slits.