JP2571662Y2 - Alarm - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm, and more particularly to an alarm suitable for use in, for example, notifying a construction site.

[0002]

2. Description of the Related Art As one of uses of an alarm which emits an alarm by voice, when performing some kind of civil engineering work in a public place, the alarm is used to notify a public that the construction is underway. May be used. Alarms can alert the public by a specific signal and / or
Or issue an audio alert such as a message.

[0003]

When the above-mentioned civil engineering work in a public place lasts several days, the alarm is naturally operated even at night. However, in a residential area, when the alarm is used even at night, the sound emitted from the alarm is too stimulating and may cause trouble to nearby residents.

[0004] It is therefore an object of the invention to provide an alarm which can solve the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION The present invention is directed at least to an alarm which is adapted to give an alarm by sound, and in order to solve the above-mentioned technical problems,
It is characterized by comprising an optical sensor that senses the amount of external light, and a control circuit that reduces the volume and / or timbre of the alarm in response to a decrease in the amount of light sensed by the optical sensor. Here, the reduction of the timbre means that the timbre is changed to a softer one or the frequency of issuing an alarm is reduced.

[0006]

The alarm device according to the present invention automatically reduces the volume and / or tone of the sound alarm by the light sensor and the control circuit in accordance with the decrease in the external light amount.

[0007]

Therefore, according to the present invention, the volume and / or timbre of the alarm issued from the alarm can be automatically reduced at night, and as a result, the stimulus that the alarm sounds exert on the public can be obtained. Can be reduced. Therefore, even if this alarm is installed in a residential area, for example, it is possible to reduce annoyance to nearby residents at night.

Further, the alarm device according to the present invention automatically reduces the volume and / or timbre of the above-mentioned alarm according to the amount of external light sensed by the optical sensor, so that it is unmanned at night. Particularly suitable for use on construction sites. That is, even if all workers leave the construction site while they are bright, at night, the volume and / or tone of the alarm is automatically reduced, and in the next morning, the original volume and And / or can be returned to tone. The volume and / or timbre of the alarms emitted from such alarms may be reduced at night, for the purpose of alerting the public. However, in the daytime, the volume and / or tone that was sufficient at night is not enough and must be increased. According to the present invention, these demands can be achieved automatically without requiring any manpower.

Further, in the present invention, since the alarm itself is provided with the optical sensor and the control circuit, the above-mentioned alarm can be installed only as desired, and the above-mentioned alarm device can be used without any other control device. Such automatic volume and / or timbre control can be performed. Therefore, there is no difference between the handling of the alarm and the conventional one.

[0010]

FIG. 1 shows an alarm 1 according to an embodiment of the present invention.
FIG. FIG. 2 is a block diagram schematically showing the internal structure of the alarm 1 shown in FIG.

The alarm 1 is in the form of a horn-type loudspeaker as a whole, and comprises a horn 2 and a central shaft 3. A speaker 4 for outputting sound is built in the central shaft portion 3.

In such an alarm 1, for example, on the outer peripheral surface of the horn section 2, an optical sensor 5 for sensing the amount of external light is provided. This optical sensor 5 is, for example, CdS
Provided by a photoconductive cell or the like. Inside the alarm 1, in addition to the speaker 4 described above, a control circuit 6 that receives a signal from the optical sensor 5, a sound source circuit 7, and an amplifier 8 are built. The alarm 1 is supplied with power from the outside.

In the above-described configuration, normally, for example, a signal sound such as “bit-bit” and / or a message voice such as “under construction. The signal is amplified by the amplifier 8 and output from the speaker 4.

On the other hand, when the amount of light sensed by the optical sensor 5 decreases, the control circuit 6 controls the amplifier 8 via line 9 to reduce the volume output from the speaker 4.
Control. Further, the control circuit 6 controls the sound source circuit 7 via the line 10 so as to reduce the timbre of the alarm output from the speaker 4. It should be noted that the reduction of the tone color means that the tone color is changed to a softer tone or that the frequency of issuing an alarm is reduced.

The control by the control circuit 6 may be such that, when the amount of light sensed by the optical sensor 5 falls below a predetermined threshold value, the volume and tone are reduced to predetermined low values. Alternatively, the volume and timbre may be changed steplessly or in multiple steps according to the change in the amount of light sensed by the optical sensor 5.

FIG. 3 is a view corresponding to FIG. 1, showing an alarm 1a according to another embodiment of the present invention. In FIG.
Elements corresponding to the elements shown in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

The embodiment shown in FIG. 3 is for clarifying that the position where the optical sensor is provided is arbitrary. In FIG. 3, the optical sensor is provided on the end face of the central shaft portion 3 of the alarm 1a. 5a is provided.

In the embodiment described above, both the volume and the tone output from the speaker 4 are changed. However, only one of the volume and the tone may be changed.

Further, the form of the alarm is not limited to the one shown in FIG. 1 or FIG. 3, and the present invention can be applied to other forms.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an alarm 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram schematically showing an internal structure of the alarm device 1 shown in FIG.

FIG. 3 is a perspective view showing an appearance of an alarm 1a according to another embodiment of the present invention.

[Explanation of symbols]

 1, 1a Alarm 4 Speaker 5, 5a Optical sensor 6 Control circuit 7 Sound source circuit 8 Amplifier

Claims (1)

(57) [Scope of request for utility model registration] 1. An alarm device for issuing at least an alarm by voice, wherein: an optical sensor for sensing an external light amount; and a volume and / or a sound of the alarm in response to a decrease in the amount of light detected by the optical sensor. An alarm device comprising a control circuit for reducing a tone.