JP2001013277A - Sound hole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound hole structure capable of switching high or low the sound pressure of sound generated with a simple structure. SOLUTION: The sound pressure of sound that a sound body 4 generates can be switched by inserting and removing an acoustic box 6 in between the sound body 4 and the sound hole 2a of the box 2. If an acoustic box 6 is inserted in between the sound body 4 and the sound hole 2a, the sound emitted by the sound body 4 is resonated and amplified within the acoustic box 6 and is discharged around from its opening 6a. If the acoustic box 6 is removed from between the sound body 4 and the sound hole 2a, the sound emitted from the sound body 4 is emitted out of the sound hole 2a as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound hole structure for switching a sound pressure of a sound generated by a sounding body such as a buzzer or a speaker used in a timepiece.

[0002]

2. Description of the Related Art In a conventional timepiece or the like, a sound emitted from a sounding body such as a buzzer or a speaker housed in a housing such as a body of the timepiece is emitted to the outside of the housing. A sound hole is provided in the wall of the housing, and sound is emitted from the sound hole. In this manner, the sound emitted to the outside of the housing has a reduced sound pressure in directions other than the emitted direction because the sounding body has directivity. For this reason, when actually listening, the listener often listens in a direction other than the emission direction, so that the sound pressure is reduced and the sound pressure is required to be further increased.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 5-69696, a second resonance chamber is provided inside the body to resonate and expand the sound produced by the sounding body, emit it to all directions, and listen to the sound. It has been proposed to eliminate the variation in sound pressure due to noise.

[0004]

In the above prior art, the sound pressure is substantially increased by eliminating the difference in sound pressure depending on the listening position by expanding the sound in resonance and emitting the sound in all directions. Therefore, the sound due to the increased sound pressure is emitted, and the user cannot arbitrarily select the sound volume. In particular, in the prior art, in order to be able to arbitrarily set the volume of the sound, it was necessary to change the drive circuit of the sounding body or to add a changeover switch.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a sound hole structure capable of switching the sound pressure of a sound generated by a simple structure.

[0006]

A sound hole structure according to the present invention is a sound hole structure for emitting a sound generated from a sounding body installed in a housing to outside from a sound hole provided in the housing. , A sound box which is disposed between the sounding body and the sound hole so as to be freely inserted and removed, and has an opening in a direction facing the sounding body; And a moving mechanism for inserting and removing between them.

The moving mechanism in the sound hole structure comprises a rotating member which is turned by an external operation or a sliding mechanism which slides by an external operation, and a sound hole for enlarged emission is provided around the sound hole. Is provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the sound hole structure of the present invention, the sound generated by the sounding body is resonantly expanded by inserting and removing the acoustic box between the sounding body in the housing and the sound hole of the housing. Alternatively, the sound pressure is switched as it is emitted without resonance expansion. The acoustic box in this sound hole structure has an opening in only one direction, and is installed so that the opening faces the direction facing the sounding body. The acoustic box is moved by an externally operable moving mechanism, and is inserted and removed between the sounding body and the sound hole. This moving mechanism comprises a rotating member or a sliding member supported by a housing, and inserts an acoustic box between the sounding body and the sound hole by rotating the rotating member or sliding the sliding member. Or it will be withdrawn.

As described above, when the acoustic box is inserted between the sounding body and the sound hole, the sound emitted from the sounding body is resonated and expanded in the sound box, and is emitted from the opening to the surroundings. Is released to the outside from the sound hole. Further, when the acoustic box is removed from between the sounding body and the sound hole, the sound emitted from the sounding body is directly emitted from the sound hole to the outside. By performing such an external operation, the sound pressure of the generated sound can be switched.

[0010]

1 and 2 are sectional views of a main part showing a sound hole structure according to an embodiment of the present invention, and FIGS. 3 and 4 are front views as seen from the direction of the sound hole.

Reference numeral 2 denotes a housing such as a body of a timepiece, in which a sounding body 4 including a buzzer, a speaker and the like is fixed. The sounding body 4 has directivity, and is arranged so as to emit sound from the sound generating hole 4 a toward the sound hole 2 a of the housing 2. Note that a space is provided between the wall of the housing 2 in which the sound hole 2 a is provided and the sounding body 4, into which an acoustic box described later can be inserted. Around the sound hole 2a, there are formed a plurality of enlarged emission holes 2b for emitting a sound which has been resonantly enlarged by an acoustic box described later.

Reference numeral 6 denotes an acoustic box, which in the present embodiment is constituted by a cup-shaped member having one opening. The acoustic box 6 is oriented so that its opening 6a faces in the direction facing the sounding body 4, and is supported between the sounding body 4 and the sound hole 2a in a detachable manner.

Reference numeral 8 denotes a moving mechanism for supporting the acoustic box 6.
The moving mechanism 8 in the present embodiment includes a lever-shaped rotating member 1.
0, the vicinity of one end thereof is rotatably attached to the housing 2 by a shaft attachment portion 10a, and the acoustic box 6 is provided at the other end. The shaft attachment portion 10a is
A switching knob 10b is provided at an end protruding outside of the box. By turning the switching knob 10b by operating it externally, the rotating member 10 can be rotated to move the acoustic box 6. The rotating member 10 and the acoustic box 6 may be formed integrally, or may be formed separately and fixed to be integrated.

In the sound hole structure having the above structure, FIG.
As shown in the figure, when the acoustic box 6 is not located between the sounding body 4 and the sound hole 2a, the sound emitted by the sounding body 4 is directly emitted outward from the sound hole 2a. The sound pressure at the front of the sound hole 2a at this time is almost the same as the sound pressure when the sound is emitted from the sounding body 4, and the sound at the listening position far from the sound hole 2a has a lower sound pressure.

Here, as shown in FIG. 3, by turning the switching knob 10b, as shown in FIG. 2 and FIG.
Rotating member 1 until acoustic box 6 is positioned between
When the sound box 6 is inserted between the sounding body 4 and the sound hole 2 a by turning 0, the sound emitted from the sounding body 4 is transmitted to the opening 6 of the sound box 6.
a enters the acoustic box 6, where it is resonantly expanded and released from the opening 6a. The sound that has been resonance-expanded in the acoustic box 6 in this way is expanded and loses directivity, and the sound hole 2a
The sound is emitted to the outside of the housing 2 from the enlarged emission sound hole 2b which is provided on the periphery of the housing 2 and which is larger than the opening. At this time, since the sound emitted from the housing 2 is a sound that is resonated and expanded in the acoustic box 6 and becomes wider, the sound having a high sound pressure is obtained not only at the front of the sound hole 2a but also at the listening position. Becomes

FIG. 5 is a sectional view of an essential part showing an embodiment in which the moving mechanism 8 in the sound hole structure shown in FIG. 1 is changed, and FIG. 6 is a front view of the sound hole structure viewed from the sound hole direction. In this sound hole structure, a sliding member 20 is used as the moving mechanism 8.
The sliding member 20 has a substantially elongated plate shape, a sliding shaft portion 20a is provided near one end, and an acoustic box 6 is provided at the other end. The sliding shaft portion 20a is
Has a cross-sectional shape such as a rectangle or an ellipse that fits into the slit 2c provided in the housing and has a shape that can slide without rotating, and has a flat switching knob 20 at its outer end.
b is provided.

The sliding member 20 detaches the acoustic box 6 from between the sounding body 4 and the sound hole 2a when the sliding shaft portion 20a is located at the left end of the slit 2c in the drawing, and the slit 2c When the sliding shaft portion 20a is located at the middle right end, the acoustic box 6 is inserted according to an external operation so as to be inserted therebetween.
To move.

As described above, the acoustic box 6 is formed by the sliding member 20.
Is moved, the sound pressure can be switched by inserting and removing the acoustic box 6 between the sounding body 4 and the sound hole 2a in the same manner as described above.

In the above embodiments, one acoustic box 6 is inserted and removed between the sounding body 4 and the sound hole 2a.
A plurality of acoustic boxes of different sizes, shapes or materials are attached to the sliding member 20 or the sliding member 20 and one of them is inserted between the sounding body 4 and the sound hole 2a by rotating or sliding. Thus, the sound pressure can be switched in various ways.

[0020]

According to the present invention, the acoustic box is removably arranged between the sounding body and the sound hole, and the acoustic box can be moved by operating the acoustic box externally. ,
The level of the sound generated by the user can be arbitrarily selected.

Further, since the sound pressure is switched using a mechanical structure of an acoustic box and a moving mechanism for moving the acoustic box, the sound pressure is switched as compared with a case where the circuit configuration of the sounding body drive circuit is changed or a switch is provided. The sound pressure can be switched with a simple and inexpensive configuration.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a sound hole structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state when sound pressure is increased in the sound hole structure shown in FIG.

FIG. 3 is a front view of the sound hole structure shown in FIG. 1 as viewed from a sound hole direction.

FIG. 4 is a front view of the sound hole structure shown in FIG. 2 as viewed from a sound hole direction.

FIG. 5 is a sectional view of a main part showing an embodiment in which a moving mechanism in the sound hole structure shown in FIG. 1 is changed.

FIG. 6 is a front view of the sound hole structure shown in FIG. 5 as viewed from a sound hole direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Housing 2a Sound hole 2b Enlarged emission sound hole 2c Slit 4 Sound generator 6 Sound box 6a Opening 8 Moving mechanism 10 Rotating member 20 Sliding member

Claims (4)

[Claims] 1. A sound hole structure that emits a sound generated from a sounding body provided in a housing to outside of a sound hole provided in the housing, wherein a space between the sounding body and the sound hole is provided. A sound box having an opening in a direction facing the sounding body, and a moving mechanism for inserting and removing the sound box between the sounding body and the sound hole by an external operation. A sound hole structure characterized by: 2. The sound hole structure according to claim 1, wherein said moving mechanism comprises a turning member which turns by an external operation. 3. The sound hole structure according to claim 1, wherein said moving mechanism comprises a sliding mechanism which slides by an external operation. 4. The sound hole structure according to claim 1, wherein an enlarged emission sound hole is provided around said sound hole.