JPS6120555Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an alarm clock that can change the volume of an alarm sound by attaching and detaching a resonance device. The present invention relates to an alarm clock that makes the alarm sound louder by installing the alarm clock in a resonance device of a clock packaging case. The purpose of this invention is to obtain a loud alarm sound. Another purpose of the present invention is to create a small and thin alarm clock. Still another object of the present invention is to eliminate the need for a special resonance device by incorporating the resonance device into the watch packaging case. FIG. 1 is a sectional view of a buzzer with a resonance device. 1 is a buzzer unit, 2 is a diaphragm, and 3 is a diaphragm drive unit, which are shown in black boxes. 4 is a cylindrical resonance device, 5 is a resonance space of volume Q surrounded by the resonance device 4 and the diaphragm 2, and 6 is a sound emission hole of radius a of the resonance device. Resonant wave frequency ₀ determined by this resonator
teeth

[Formula] (C is the speed of sound), so when the frequency of the diaphragm 2 is close to the resonance wave frequency ₀ , a louder sound is emitted due to the resonance effect than when there is no resonance device. FIG. 2 is a sectional view of a conventional alarm clock equipped with a resonance device. 7 is a liquid crystal panel, 8 is a circuit board on which electronic components are installed, 9 is a buzzer unit, 1
0 is a diaphragm, and 11 is a driving portion of the diaphragm 10, which are shown as black boxes in the figure. 12 is a cover glass, 13 is an outer shell, 44 is a back lid, 15 is a resonance space created inside the back lid 14, and 16 is a sound emitting hole. Due to the resonance effect of the resonance space 15 and the sound emitting hole 16, an alarm sound louder than the volume of the buzzer unit 9 alone is generated. However, resonance space 1
5 takes up quite a large space, making it a thick and large watch. Also, the back cover 14
Since the structure is complex, the cost of the exterior is very high. In addition, since the sound is always loud, it is convenient when used as an alarm clock, but is not suitable for use as a timetable information when normally carried. The present invention eliminates such drawbacks and will be described below with reference to the drawings. FIG. 3 is a sectional view of an embodiment of an alarm clock having a removable resonator. 17 is a liquid crystal panel that displays the time, 18 is a circuit board on which electronic components are mounted, 19 is a buzzer unit, 20 is a diaphragm of the buzzer unit 19, and 21 is a driving part of the diaphragm 20, which is shown as a black box in the figure. It is shown. 2
2 is a cover glass, 23 is an outer body, 24 is a back lid,
25 is a sound emitting hole drilled in the back cover, and the diaphragm 20
The sound generated is emitted to the outside. Reference numeral 26 denotes a resonance lid serving as a resonance device, and the back lid 24 can be attached and detached by tightening 27 and 28. 29 is a resonance space surrounded by the back cover 24 and the resonance cover 26; 30
is a sound hole. The alarm clock of the present invention can be used as a thin clock by removing the resonant button 26 when normally carried. Further, since the sound is emitted directly from the buzzer unit 19, the volume is suitable for time notification. However, if you need a loud buzzer sound,
For example, when used as an alarm clock, if the resonant button 26 is attached, the resonant effect of the resonant space 29 and the sound emitting hole 30 makes it possible to generate an extremely loud alarm sound based on the above-mentioned principle. It is also portable even with the resonant lid 26, although it is somewhat thicker. FIG. 4 is a sectional view of an alarm clock with a removable resonator according to another principle. The structure of the watch body is almost the same as the example shown in FIG. 31 is a buzzer unit, 32 is a sound emitting hole corresponding to the back cover 33, 34 is a sounding plate as a resonance device, and slopes 35 and 36 have a conical shape. 37 is the sound board pin and the back cover 33
By inserting it into the hole, the resonator plate 34 can be attached and detached. Conical slopes 35, 36 of sounding plate 34
By emitting sound from the sound emitting hole 32 at the apex, a resonance effect appears. The advantages of this resonator are exactly the same as the embodiment of FIG. According to the present invention, in an alarm clock in which a resonance device is attached to the back cover, the back cover has a flat outer surface, a sound emitting hole, and an uneven or hole portion for attaching a sound plate when the watch is not carried. The sound plate can be detachably attached to the case back, and is configured so that the resonance wave frequency ₀ of the resonance space and the frequency of the diaphragm are approximately equal to each other, and when the watch is carried, the sound plate is not attached. Since it is configured so that the sound is emitted directly from the sound emitting hole on the back cover, the design of the watch is maintained without making the watch thick when you carry it, and it can also be used when you need to emit a loud sound that is usually unnecessary, such as when setting off an alarm. , sufficient sound volume can be obtained by simply installing a sounding board that creates a resonant space, and it satisfies both the design and alarm function, which had been contradictory in the past. This invention is a needle display alarm clock, a clock for the blind,
It can also be applied to small audio equipment such as calculators with alarms and ultra-compact radios.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a buzzer with a resonator. 1... Buzzer unit, 4... Resonator, 5...
...Resonance space, 6...Sound emission hole. FIG. 2 is a sectional view of a conventional alarm clock equipped with a resonance device. 9...Buzzer unit, 14...Back cover, 15
... Resonance space, 16... Sound emission hole. FIG. 3 is a sectional view of an embodiment of an alarm clock with a removable resonator. 19...Buzzer unit, 24...Back cover, 2
6... Resonance pig, 29... Resonance space, 30... Sound emission hole. FIG. 4 is a sectional view of an alarm clock equipped with a removable resonator according to another limitation. 31...Buzzer unit, 33...Back cover, 3
4...Sounding board.

Claims (1)

[Scope of utility model registration request] In an alarm clock in which a resonator is attached to a back cover, the back cover has a flat outer surface, a sound emitting hole, and a sound plate for creating a resonant space outside the back cover when the watch is not carried. The resonance plate has an unevenness or a hole, and the resonance plate can be detachably attached to the back lid, and is configured so that the resonance frequency ₀ of the resonance space and the frequency of the diaphragm 2 are approximately equal to each other, and An alarm clock characterized in that when the timepiece is carried, the sound is emitted directly from the sound emitting hole of the back cover without using the sounding board.