JPH01264298A - Cooling device of small-sized electronic apparatus - Google Patents

Abstract

PURPOSE:To make it possible to cool and optional circuit substrate without decreasing the cooling efficiency of other components, by providing air holes to a decorative sheet which is installed to the optionally mounting window of an enclosure. CONSTITUTION:An optionally mounting window 1a is formed in a position corresponding to an option rack at the rear face of an enclosure 1 and an option circuit substrate 8 is inserted into the option rack from the optional mounting window 1a and is connected to an expansion slot. A decorative sheet 10 where air holes 10a are made is connected to the back end of the option circuit substrate 8. The decorative sheet 10 is fixed to the frame of the window withscrews so that it closes a region corresponding to the optionally mounting window 1a in a state that the option circuit substrate 8 is housed in the option rack and is connected to the expansion slot. The cooling air cooling a power source and the like is inhaled from air holes 1c and is exhausted from an exhaust fan 2. As the parts of the optionally mounting window 1a corresponding to regions to which the option circuit substrates 8 are not mounted are closed by decorative sheets 3b and 3c which are lacking in the air holes, no such a waste cooling air is inhaled to pass through without stopping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for small electronic equipment that allows attachment of an optional circuit board.

[Conventional technology]

A small electronic device that allows optional circuit boards to be attached from the outside has a main circuit board for the main control circuit placed at the bottom of the housing 1, as shown in Figure 5, and a plurality of circuit boards mounted on the main circuit board. A motherboard with an expansion slot for connecting an optional circuit board is provided vertically, and an optional rack is installed on the rear of the chassis to accommodate and hold the optional circuit board inserted through window 1a. It is equipped with an exhaust fan 2 that ventilates and cools the air. Note that 3a is a decorative board with an optional circuit board inside, 3b and 3c are decorative boards without an optional circuit board, and the option can be mounted on window 1 if necessary.
It is attached to a.

1b is a ventilation hole.

For such small electronic devices, optional racks are often provided with a wide range of ventilation holes in order to improve the cooling effect inside the optional racks, and therefore, these optional racks have complex structures to ensure their rigidity. There is a problem of increasing size.

In addition, the exhaust fan 2 is installed at the rear of the side of the chassis 1 to prevent exhaust air and noise from being generated in the front, and the intake vent 1b is installed at the opposite side so that the main circuit board and the option rack are not exposed. Ensures that sufficient cooling airflow is generated.

[Problem to be solved by the invention]

The conventional equipment described above is configured so that sufficient cooling air flows through the option rack even when all the option circuit boards are mounted and arranged in the option rack, so no option circuit boards are mounted. Or, when the number is small, the ventilation resistance inside the option rack becomes too small, causing the problem that the cooling air passes through the inside of the option rack and the cooling effect of the main circuit board decreases.

Therefore, an object of the present invention is to provide a cooling device for this type of small electronic device that can effectively cool the optional circuit board and the main circuit board without being affected by the number of optional circuit boards mounted. .

[Means to solve the problem]

The present invention provides an optional installation method for a case in which an exhaust fan is attached and a window is formed, such that a decorative board is attached to the window, and an optional circuit board coupled to the decorative board is installed in the case. In the cooling device for a small electronic device, the decorative board is provided with ventilation holes.

[Effect]

When the optional circuit board is installed, air is taken in through the ventilation holes of the decorative board to which the optional circuit board is mounted, and the optional circuit board is cooled. If the optional circuit board is not installed, the window is covered with a decorative board without ventilation holes, which prevents wasteful air intake and reduces the cooling effect of other circuit boards.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

3 and 4 show the arrangement of components of a small electronic device according to the present invention. A power source 4 is provided on one side surface of the housing 1, and an exhaust fan 2 is provided behind the power source 4. The main circuit board 5 is arranged along the bottom of the housing 1, and an option rack 6 extending from the rear surface of the housing 1 has a motherboard 7 vertically provided with an expansion slot connected to the main circuit board 5. . The option circuit board 8 is inserted into the option rank 6 through the window on the rear surface of the housing, and is coupled and held in the expansion slot.

A storage device 9 is provided at the front of the housing, and a vent IC is provided at the front of the bottom.

The structure of mounting the optional circuit board will be described in detail with reference to FIG. A window 1a is formed on the rear surface of the housing 1 at a position corresponding to the option rack, and the option circuit board 8 is installed from the window 1a to the option rank 6.
the expansion slot. A decorative board 1o in which a ventilation hole 10a is formed is coupled to the rear end of the optional circuit board 8, and when the optional circuit board 8 is stored in the option rack 6 and coupled to the expansion slot, the option can be installed in the window 1a. It is screwed to the window frame to close off the area. When installing the option, the area of the window 1a where the option circuit board is not mounted is covered with decorative boards 3b and 3c that do not have ventilation holes.

FIG. 2 shows a perspective view of a small electronic device configured in this manner.

In the above configuration, cold air for cooling the power supply 4, main circuit board 5, storage device 9, etc. is drawn in through the ventilation hole 1c and exhausted from the exhaust fan 2.

The cold air that cools the optional circuit board 8 is sucked in through the ventilation hole 10a and exhausted from the exhaust fan 2.

The window 1c for installing the option corresponding to the area where the option circuit board 8 is not mounted is covered with decorative boards 3b and 3c that do not have ventilation holes, so that unnecessary cold air is not sucked in and passes through. without reducing the cooling effect of other components.

When an optional circuit board is added, the same effect can be obtained by making the decorative board of the optional circuit board also have ventilation holes.

〔Effect of the invention〕

As described above, in the present invention, the optional circuit board can be cooled without reducing the cooling effect of other components by providing ventilation holes in the decorative board corresponding to the optional circuit board.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a main part showing the structure of mounting an optional circuit board in a small electric device according to the present invention, Fig. 2 is an overall perspective view of the small electronic device, Fig. 3 is a cross-sectional plan view thereof, and Fig. 4 The figure is a sectional view taken along the line IV-rV in FIG. 3, and FIG. 5 is a perspective view of a conventional small electronic device. 1...Housing, 1a...Optional installation is window, 1c...
...Vent hole, 2...Exhaust fan, 3b, 3c, 10.
... Decorative board, 8... Optional circuit board, 10a...
・Vent holes.

Claims (1)

[Claims] 1. A small case in which an exhaust fan is attached and an option mounting window is formed, and a decorative board is attached to the option mounting window, so that an optional circuit board coupled to the decorative board is installed inside the housing. 1. A cooling device for a small electronic device, characterized in that the decorative board is provided with ventilation holes.