JPH09113085A - Cooling fan with buzzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the abnormality of a cooling fan easily and to prevent the damage of electronic device. SOLUTION: An electronic device has a rotational speed measuring circuit 5a which measures the number of revolutions of a cooling fan 5 with a buzzer and outputs a detection signal when a detection value of the number of revolutions becomes a preset value or below, a warning sound generating circuit 5b which receives the detection signal as an input from the rotational speed measuring circuit 5a and generates a warning sound signal and a buzzer 5c which receives the warning sound signal as an input from the warning sound generating circuit 5b and issues a warning sound for making abnormality known. A plurality of set values can be set beforehand for the rotational speed measuring circuit 5a and different detection signals corresponding to these set values respectively may be outputted therefrom. According to this constitution, an operator can detect the abnormality of the cooling fan easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan with a buzzer, and more particularly to a cooling fan with a buzzer mounted on a housing of an electronic device.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of an embodiment of the prior art.

Referring to FIG. 3, conventionally, when some abnormality occurs in the cooling fan 7 in the electronic device 6 and the rotation speed of the cooling fan 7 falls below a preset value, the cooling fan 7 is cooled. The rotation speed detection circuit (not shown) incorporated in the vehicle detects the abnormality, and the detection output informs the operator of the abnormality by lighting the LED (light emitting diode) 8.

[0004]

In the above-described conventional cooling fan, when any abnormality occurs, the rotation speed detection circuit built in the cooling fan detects a decrease in the rotation speed, and the abnormality is turned on by the LED. Since it is a method of notifying the operator by visually confirming the above, there is a drawback that the operator's abnormality detection may be delayed and the product may be damaged.

[0005]

A cooling fan with a buzzer according to the present invention comprises a rotation speed detection circuit for measuring the rotation speed of the cooling fan and outputting a detection signal when the measured value is equal to or lower than a preset set value. An alarm sound generation circuit that inputs a detection signal from the rotation speed detection circuit to generate an alarm sound signal, and a buzzer that sounds by the alarm sound signal input from the alarm sound generation circuit are provided.

Further, the rotation speed detection circuit can determine a plurality of the set values, and outputs different detection signals depending on the set values, and the warning sound generation circuit outputs the different detection signals. Is used to generate a plurality of warning sound signals.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, showing a state of being mounted on an electronic device.

Referring to FIG. 1, an electronic device 1 includes an electronic circuit board 2 on which an LSI, a resistor, a capacitor, etc. are mounted in order to perform processing such as calculation in a housing. The magnetic disk device 3 that stores processed data and the power supply unit 4 that supplies power to the electronic circuit board 2 and the magnetic disk device 3 are provided, and an example of a device configuration of the electronic device is shown. In addition to these configurations, a cooling fan 5 with a buzzer is provided to cool the heat generated by the internal components in the housing by forced air cooling.

FIG. 2 is a block diagram showing the details of the cooling fan with a buzzer shown in FIG.

Referring to FIG. 2, the cooling fan 5 with a buzzer according to the present invention measures the number of rotations of the cooling fan, and outputs a detection signal when the measured value is equal to or less than a preset set value. A circuit 5a, a warning sound generation circuit 5b that inputs a detection signal from the rotation speed detection circuit 5a to generate a warning sound signal, and a buzzer 5c that sounds by the warning sound signal input from the warning sound generation circuit 5b. Has been done.

Next, the operation of the present invention thus constructed will be described.

If the number of rotations of the cooling fan mounted on the electronic device decreases for some reason and falls below the set value,
The rotation speed detection circuit 5a outputs a detection signal to the warning sound generation circuit 5b. Therefore, the warning sound generation circuit 5b sends a warning sound signal to cause the buzzer 5c to ring. This allows
The operator can recognize that an abnormality has occurred in the cooling fan of the electronic device and take necessary measures.

As another embodiment, the rotation speed detection circuit 5a can set a plurality of set values, and outputs different detection signals depending on the set values, and the warning sound generation circuit 5b is provided. A plurality of warning sound signals may be generated by different detection signals from the rotation speed detection circuit 5a.

Then, for example, when two set values for determining that the cooling fan rotational speed is abnormal are set as the first and second set values, the cooling fan rotational speed is first.
When it is lower than the set value of, the buzzer sounds a warning sound with a small sound, and when the rotation speed of the cooling fan is further lowered, and when it is lower than the second set value, the warning sound at the first set value is set. It can be sounded with a louder warning sound.

[0016]

As described above, according to the present invention, since the cooling fan itself is provided with a circuit for detecting a decrease in the number of rotations and generating a warning sound and a buzzer for notifying the abnormality, it is better than lighting an LED (light emitting diode). There is an effect that the abnormality can be easily recognized, and therefore damage to the electronic device can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing details of a cooling fan with a buzzer shown in FIG.

FIG. 3 is a perspective view showing a conventional example.

[Explanation of symbols]

 1,6 Electronic device 2 Electronic circuit board 3 Magnetic disk device 4 Power supply unit 5 Cooling fan with buzzer 5a Rotation speed detection circuit 5b Warning sound generation circuit 5c Buzzer 7 Cooling fan 8 LED (light emitting diode)

Claims (2)

[Claims] 1. A rotation speed detection circuit for measuring the rotation speed of a cooling fan and outputting a detection signal when the measurement value is equal to or lower than a predetermined set value, and a detection signal is input from the rotation speed detection circuit to generate a warning. A cooling fan with a buzzer, comprising: a warning sound generation circuit for generating a sound signal; and a buzzer that sounds according to a warning sound signal input from the warning sound generation circuit. 2. The rotation speed detection circuit is capable of determining a plurality of the set values, and outputs different detection signals depending on the set values, and the warning sound generation circuit outputs the different detection signals. The cooling fan with a buzzer according to claim 1, wherein a plurality of warning sound signals are generated by the.