JPS6120638Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sound alarm structure for a small electronic device equipped with a sound alarm function.

Recently, small electronic devices such as electronic watches,
Pendant-type watches have been commercialized, and more and more pendant-type electronic watches are equipped with an alarm function.

However, since the above-mentioned pendant type electronic watches are hung from the neck with a hanging string, they are easily turned upside down. A disadvantage of pendant electronic watches is that when the watch is turned upside down, the sound hole is blocked by the chest, making it difficult to hear the alarm sound.

This idea was made in consideration of the above-mentioned circumstances, and its purpose is to
Sound emitting holes are formed on at least opposing surfaces of the device case so that the sound generated by the electroacoustic transducer is emitted to the outside from all the sound emitting holes, and the sound emitting holes on one surface are blocked. To provide a sound reporting structure for a small electronic device which can clearly report sound by emitting sound from a sound emitting hole on another surface even when the sound is emitted from a sound emitting hole on another surface.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a watch body of a pendant type electronic watch, and 2 is a hanging strap thereof. The watch body 1 houses a watch module 4 and an electroacoustic transducer such as an electromagnetic buzzer 5 in a watch case 3. The watch module 4 houses an LSI 8 and a crystal oscillator (not shown) in a module housing 6. It holds a circuit board 7 with components such as
This watch module 4 is installed with the display panel 9 facing a display window 10 provided on the front side of the watch case 3. Note that 11 is the display window 1
0 is a protective glass attached, 12 is an interconnector sandwiched between the terminal arrangement portion of the display panel 9 and the circuit board 7, 13 is a sealing resin for the LSI 8, and 14 is a battery.

On the other hand, the electromagnetic buzzer 5 is provided within the insulating frame 15.
A pole 16, an excitation coil 17, and a permanent magnet 18 are provided, and magnetic bodies 20, 20 are attracted or repelled by passing an alternating current through the excitation coil 17 at both open ends of the insulating frame 15, respectively.
The excitation coil 17 of the electromagnetic buzzer 5 is connected to the circuit board 7 of the timepiece module 4 via a lead wire (not shown). Further, a plurality of sound emitting holes 21, 21 are formed in the mutually opposing portions of the surface and the release surface of the watch case 3, and the electromagnetic buzzer 5 is connected to the watch case 3.
The diaphragms 19, 19 on both sides are installed to face the sound emission holes 21, 21 formed on both sides, respectively. The electromagnetic buzzer 5 is held in a buzzer holding portion 6a that is integrally formed with the housing 6 of the watch module 4 in order to facilitate mounting within the watch case 3.

That is, this pendant type electronic watch includes an electromagnetic buzzer 5 having sound emission holes 21, 21 formed in opposing sides of the watch case 3, respectively, and diaphragms 19, 19 provided on both sides between them. In this pendant type electronic watch, the surface of the watch case 3 is placed so that the sound generated by the electromagnetic buzzer 5 is emitted to the outside from the sound emission holes 21, 21 on both sides. Even when the watch case 3 is in contact (the sound emitting holes 21, 21 on the back side are blocked by the chest), or when the watch case 3 is turned over, the sound emitting holes 21, 21 on the front side are blocked by the chest. Even in the closed state, the buzzer generated sound is reliably emitted from the sound emitting holes 21, 21 on either the front or the back that are not in contact with the chest, so there is no chance of the alarm sound being missed.

In the above embodiment, the sound emitting holes 21, 21 are formed only on both the front and back sides of the watch case 3, but the sound emitting holes 21 may also be formed on the side surfaces of the watch case 3, in which case A gap may be provided between the inner peripheral surface of the electromagnetic buzzer 3 and the electromagnetic buzzer 5, and the sound generated by the buzzer may be guided to the sound emitting hole on the side surface through this gap. Further, in the above embodiment, an electromagnetic buzzer 5 having diaphragms 19 on both sides is used as an electroacoustic transducer, but this electromagnetic buzzer 5 has a diaphragm 19 on only one side. (In this case as well, a gap may be provided between the inner circumferential surface of the watch case 3 and the electromagnetic buzzer 5 so that the sound generated by the buzzer is guided to all the sound emitting holes 21, 21.) The acoustic transducer is not limited to an electromagnetic buzzer; for example, a piezoelectric buzzer or the like may be used. Further, although the above embodiment is a pendant-type electronic clock, the small electronic device of this invention is not limited to a pendant-type electronic clock, and includes, for example, a pendant-type electronic music box, a small electronic calculator with a clock function, It may also be a pocket electronic watch or the like.

As mentioned above, the sound emitting structure of the small electronic device of this invention has sound emitting holes formed on at least opposing surfaces of the device case, and the sound generated by the electroacoustic transducer is emitted from all the sound emitting holes to the outside. Since it is designed to emit sound, even if the sound emitting hole on one side is blocked, the sound can be reliably emitted from the sound emitting hole on the other side, so a clear sound signal is always emitted. can be done.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a longitudinal sectional side view showing an embodiment of this idea. 3... Watch case, 5... Electromagnetic buzzer, 21...
...Sound hole.

Claims (1)

[Scope of utility model registration request] A device case having sound emission holes formed on at least opposing surfaces, and an electric device provided inside the device case, with a coil attached to the center, and diaphragms facing each other with the coil sandwiched therebetween. A sound reporting structure for a small electronic device, comprising an acoustic transducer, and configured to emit sound generated by the electroacoustic transducer to the outside of the device case from opposing sound emission holes formed in the device case. .