JPS5844396Y2 - Clock alarm buzzer - sound resonance structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an alarm mechanism for a watch, and more particularly to a resonance structure for an alarm buzzer sound.

Generally, watches are equipped with an alarm mechanism.

Alarm methods include ringing a bell or the like, turning on a radio or the like, and ringing a buzzer.

For example, in the case of an electric clock whose drive source is a synchronous motor,
A buzzer mechanism using the leakage magnetic flux zi:j of the motor is employed, but in the case of liquid crystal or electronic watches, a small buzzer or a buzzer device using transistor oscillation sound is provided.

By the way, this alarm buzzer is naturally required to have a volume that the user can confirm, but if the buzzer device itself included in the latter watch has that capacity, the Therefore, a large and expensive device must be adopted.

Recently, the size of the clock drive portion has been reduced by using integrated circuit elements, etc., so the above-mentioned problems with the buzzer device are extremely large.

In view of these circumstances, the present invention utilizes a relatively small, inexpensive, and low-volume oscillator as a buzzer drive source, and skillfully resonates the buzzer sound from this sounding body, allowing it to be used as a wake-up buzzer sound for a clock. This provides an alarm buzzer sound resonance structure for a clock configured as described above.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

Fig. 1 is an exploded perspective view of an electronic digital watch that employs the buzzer sound resonance structure of the present invention, and Fig. 2 is a perspective view from the bottom. 1 and a lower case 2,
At the bottom of the lower case 2, there is a pedestal section 20 which is fitted as shown in FIG.
is provided.

The watch components are mainly assembled into the lower case 2, and for this purpose, the bottom wall of the lower case 2 is formed with a plurality of hole studs or mounting seats.

For example, the studs 28 to 2c are for mounting and fixing the printed circuit board 3, and the studs 2d to 2c are provided upright at the four corners.
2g is a support for connecting the lower case 2 and the upper case 1, and the seats 2h and 2i are for fixing the small power transformer 4.

Furthermore, various electrical components such as resistors and various switch boxes are electrically connected and mounted on the printed circuit board 3.

Note that the studs 28 to 2c are provided on the bottom wall of the lower case 2.
In addition to the mounting seats 2h and 2i, a resonance cylinder 10, which will be described later, and protrusions such as a cord holding part and a reinforcing lip (not shown) are integrally formed at appropriate positions. Since this is not the purpose of this section, it will be omitted for convenience of explanation.

Reference numeral 5 denotes a display device 5 on which an LSI display element body 5A or a clock logic circuit element (not shown) is mounted, and is connected to the printed circuit board 3 by a cable connector (not shown).

The lower edge of the display 5 is fitted into a mounting groove 2A formed at the front edge of the lower case 2, and the other side edge is fitted into a groove IA formed at the inner peripheral edge of the front open portion of the upper case 1. 3 in a state where the upper and lower cases 1.2 are connected.
and fixed.

Reference numeral 6 denotes a speaker for an alarm buzzer, which is connected to an alarm circuit via a lead wire 6a through a volume control circuit mounted on the printed circuit board 3, etc., and is made using, for example, a commercially available earphone.

This speaker 6 is fixed by fitting its cylindrical buzzer sound sending portion 6A into the resonance cylinder 10.

FIG. 3 is a diagram illustrating a buzzer sound resonance structure, which is the gist of the present invention.

The shape of the resonance cylinder 10 is clearly shown in the figure, and it is formed as a truncated conical cylinder, with a cape t, 1
oA is formed so that the diameter of the lower opening is almost the same as the diameter of the upper opening.

As is clear from FIG. 1, the position of the resonator tube 10 is protruded from the center of one longitudinal side surface of the lower case 2.

The height of the center hole 10A of the resonance tube 10 is 1/1, 1/1 of the wavelength λ of the buzzer sound sent from the speaker 6.
211/4...The length is set.

As a result, the buzzer sound repeatedly resonates inside the center hole 10A and is emitted to the outside from the lower opening.

On the other hand, as described above, the frame-shaped pedestal part 20 is integrally formed at the bottom of the lower case 2, and the height of this pedestal part 20 on the display side is slightly higher than on the back side.

The lower opening of the resonator tube 10 is located at the bottom of the lower case 2 that extends sideways from the pedestal 20.

Therefore, when the digital watch shown in this embodiment is placed on the stand 25, the lower opening of the resonance tube 10 enters the space H surrounded on three sides by the stand 25, the protruding bottom of the lower case 2, and the pedestal part 20. This means that it is oriented toward

Since this embodiment is configured as described above, a weak oscillator such as an earphone that emits a sound that cannot be heard when placed far from the ear is used as the speaker for the buzzer sound. The buzzer sound repeats resonance and is emitted into the space H from the lower opening of the center hole 10A as a loud buzzer sound.

Furthermore, this amplified buzzer sound is amplified to a louder sound at the resonance reflection limit at the bottom of the lower case 2, the pedestal 20, or the surface of the pedestal 25 in the space H, thereby generating an alarm sound.

In the above embodiment, if an adjustable lid or the like is provided at the bottom of the lower case to cover the lower opening of the resonance tube 10, and the area of the lower opening is adjusted by the lid, the volume can be adjusted. can be done.

As explained in detail above, according to the present invention, a resonance tube is integrally provided in the lower case of a watch case with a pedestal integrally formed at the bottom, and a relatively low-volume speaker is installed in the upper opening of the resonance tube. The sound transmitting part is inserted into the center hole, and the lower opening passes through the bottom of the lower case at a side position of the pedestal part, so that the lower opening faces the space formed by the lower case, the pedestal part, and the pedestal. The buzzer sound emitted from the speaker is amplified by resonance inside the resonant cylinder, and then emitted to the outside of the watch case, and is further reflected by resonance within the space, resulting in an extremely loud sound. A buzzer sound will be generated.

Therefore, although relatively small and inexpensive, small earphones that cannot be heard unless worn in the ear can be used as the source of the alarm buzzer sound, that is, as a speaker, making the entire watch more compact and reducing costs. can do.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an electronic digital watch showing an embodiment of the present invention, Fig. 2 is a perspective view of the electronic digital watch as seen from the bottom, and Fig. 3 is a sectional view illustrating the outline of the buzzer sound resonance structure. . 1... Upper case, 2... Lower case, 3... Printed circuit board, 5... Display, 6... Speaker, 6A ...Buzzer sound sending unit, 10...Resonance cylinder, IOA...
Center hole, 20... Pedestal section, 25... Placement stand, H... Space.

Claims (1)

[Scope of utility model registration request] A resonance tube is integrally provided inside the bottom wall of a watch case with a pedestal integrally formed at the bottom. An alarm buzzer sound resonance structure for a watch, characterized in that a speaker is fitted and supported in the opening, and the lower part is opened at a side position of the pedestal part of the bottom wall of the case.