JPS5930960Y2 - Sound-producing devices such as clocks - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sounding device used in alarm clocks and the like.

Conventionally, for example, in small and thin watches, the end of the buzzer horn on the sound hole side is attached to the outer case of the watch.

However, due to manufacturing errors or exterior conditions, a slight gap may occur between the end of the horn and the exterior case, and this may cause the buzzer to build up on the exterior case even if it is highly efficient as a single unit. This has the disadvantage that impedance matching deteriorates, reducing efficiency, and the buzzer sound leaks into the outer case, reducing the sound.

In addition, the outer case has a sound output hole formed in the part facing the horn, but this sound output hole is often changed to various shapes and sizes depending on the design of the outer case. This was also a major factor in poor winter consistency.

Therefore, the purpose of the present invention is to provide a sounding device that can prevent the reduction in sounding efficiency caused by attaching the sounding device to the outer case, can produce high-quality sound, and does not increase the thickness of the outer case. .

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, a case 1 of a portable digital watch consists of two outer cases 1a and 1b, and a time display window 2 is formed in the upper outer case 1a.

A watch case 1 is provided with a buzzer 3 adjacent to a time display window 2.

Therefore, the specific configuration of the buzzer 3 will be explained based on FIG. 2.

A circuit board 4, which is a mounting plate, is supported on the exterior case 1a by suitable support means, and this circuit board is located close to the lower exterior case 1b.

A horn 5 with a cap closed is mounted on the circuit board 4 via a support stand 6.

The horn 5 has a diaphragm 7 housed therein, a first resonance chamber R, and a sound hole 5b formed in the center of the front end surface 5a.

The support stand 6 is formed with a cap facing downward, and is inserted and fixed into a fixing hole of the circuit board 4, and its upper end opening is press-fitted into a recess 5Q in the lower inner peripheral surface of the horn 5 and held there.

The periphery of a conductive diaphragm 70 is sandwiched between the upper end surface of the support base 6 and the horn recess 5c, and a piezoelectric element 8 is mounted on the lower surface of the diaphragm.
is fixed.

Drive electrode films (not shown) formed on both sides of the piezoelectric element 8.

A lead wire 9 is connected to one of the two.

Note that the diaphragm 7 is not necessarily limited to one driven by the piezoelectric element 8.

For example, it may be electromagnetically driven.

Also, the sound hole 5b of the front end surface 5a of the horn 5 and the outer case 1a
The exit hole 11a is located opposite to the exit hole 11a...
An elastic body 10 is interposed between the horn and the exterior case, and a second resonance chamber R is configured between the horn and the exterior case.

The elastic body 10 is a ring-shaped thing made of rubber or the like, and this elastic body is attached to the outer peripheral part 5b of the front end face of the horn.
The upper end of the elastic body is in close contact with the lower surface of the outer case 1a, so the sub-resonance chamber R2 is sealed by the elastic body 10.

Volume of each resonance chamber R1, R2, sound hole 5b, sound output hole 11a
Since the area of the transducer as a whole acts as an acoustic transducer, the custom-made area is predetermined to a good value.

Sound output hole 11a bored in the exterior case 1a...
According to the illustrated example, the groove is composed of a plurality of long grooves to enhance the design effect.

As explained above, according to the present invention, a horn having a sound hole bored on its front end face, a diaphragm disposed on the front end face of the horn, and a horn surrounded by the diaphragm and the inner surface of the horn. When a buzzer having a resonance chamber formed by Since the sub-resonance chamber is formed between them, even if the shape and size of the sound output hole are changed in various ways depending on the design, the sub-resonance chamber can be set to an appropriate volume relatively freely according to the change. .

This improves the alignment between the buzzer and the sound output hole of the outer case, and does not reduce sound production efficiency.

Furthermore, since the structure is simple, assembly is easy.

Furthermore, since a part of the outer case is used to provide the sub-resonance chamber, there is no need to increase the thickness of the outer case, and the practical effects are truly significant.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a portable digital watch, and FIG. 2 is an enlarged cross-sectional view taken along line 1--2 in FIG. 1... Case, 1a, 1b... Exterior case, 3... Buzzer, 4... Additional board,
5...Horn, 5a...Horn front end surface, 5b...Sound hole, 7...Diaphragm, 8.
...Piezoelectric element, 10...Elastic body, 11a
...Sound hole, R1...Resonance chamber, R2...
...Sub-resonance chamber.

Claims (1)

[Scope of Claim for Utility Model Registration] A cylindrical horn with a sound hole bored in its front end face, a diaphragm disposed inside the horn, and a diaphragm surrounded by the diaphragm and the inner surface of the horn. The buzzer is disposed inside an outer case of a watch or the like, and the outer case has a resonance chamber formed by a front end surface of the horn. A ring-shaped elastic body is interposed between the outer periphery of the front end surface of the horn and the inner surface of the outer case, and the inner periphery of the elastic body, the front end surface of the horn, and the inner surface of the case A sounding device, such as a clock, characterized in that a sub-resonance chamber is formed by being surrounded.