JP2018137546A - Sound volume adjustment mechanism and notification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volume adjustment mechanism capable of adjusting sound pressure at frequencies in a device with a built-in sound source apparatus capable of switching frequencies of an output sound.SOLUTION: A volume adjustment mechanism 100 adjusts sound pressure of sound from a buzzer 2 mounted inside a casing 1 and capable of switching a frequency of the output sound. A sound emitting part 11 is provided with a plurality of sound emitting holes 11A that lead the sound output from the buzzer 2 to the outside of the casing 1 and that go through the casing 1. A sound insulating board 12 is attached to the sound emitting part 11 and exposes part of the sound emitting holes 11A. Moving the sound insulating board 12 changes total opening area of the exposed part of the sound emitting holes 11A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a volume adjustment mechanism and a notification device.

  An apparatus in which a sound source device such as a buzzer is incorporated in a housing is generally designed so that a large sound pressure can be obtained in consideration of the convenience of a listener. As a device in which such a sound source device is incorporated, for example, Patent Document 1 proposes a hands-free call device capable of controlling the volume output from a speaker.

  In this hands-free communication device, an opening / closing adjustment plate having a hole provided at the same position as the sound emitting hole of the speaker is provided, and the opening / closing adjusting plate is slid to adjust the area where the sound emitting hole and the hole of the opening / closing adjusting plate overlap. Adjust the output volume.

JP 2006-157487 A

  However, although the above apparatus can adjust the volume of the sound from the sound source device, it does not consider the case of changing the frequency. In general, when the housing of the apparatus is designed so that the sound pressure at a specific frequency is maximized, if the frequency is changed, the sound pressure is reduced compared to the case where the frequency to be designed is used. For this reason, when the frequency is changed, the frequency after the change is deviated from the resonance frequency of the housing, which causes a problem that it is difficult to hear the sound.

  In addition, when a plurality of devices that output sound of a specific frequency are used, it is difficult to distinguish which device is outputting sound because the frequencies are the same. For this reason, it is preferable to output a sound having a different frequency for each device, but it is not realistic to optimize the design of the housing of the device for each frequency in view of an increase in design requirements.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to adjust the sound pressure of each frequency in an apparatus incorporating a sound source device capable of switching the frequency of sound to be output. It is to provide a volume adjustment mechanism capable of performing the above.

The volume adjustment mechanism according to the first aspect of the present invention includes:
A volume adjustment mechanism that adjusts the sound pressure of sound from a sound source device that is mounted inside the housing and can switch the frequency of the sound to be output,
A sound emission part provided with a plurality of sound emission holes penetrating the housing, guiding the sound output from the sound source device to the outside of the housing;
A sound insulating plate attached to the sound emitting unit and exposing a part of the plurality of sound emitting holes;
By moving the sound insulating plate, the total opening area of the exposed ones of the plurality of sound emitting holes is changed.
As a result, the total opening area of the exposed ones of the multiple sound emission holes changes, so that the resonance frequency of the housing changes, and the sound pressure is adjusted for each frequency of sound output from the sound source device. can do.

A volume adjustment mechanism according to a second aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the sound insulating plate is provided with a notch or an opening for exposing the plurality of sound emitting holes in a part of the plate-like member.
Thereby, the sound emission hole at the position of the notch or the opening can be exposed.

A volume adjustment mechanism according to a third aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the plurality of sound emitting holes are aligned on a straight line or arranged on a circumference.
Thereby, the sound emission hole to be exposed can be easily selected.

A volume adjustment mechanism according to a fourth aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the plurality of sound emitting holes have different opening areas.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A volume adjustment mechanism according to a fifth aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the opening area of the plurality of sound emitting holes continuously change.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A volume adjustment mechanism according to a sixth aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the opening area of each of the plurality of sound emitting holes is changed every predetermined number.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A volume adjustment mechanism according to a seventh aspect of the present invention is the volume adjustment mechanism described above,
It is desirable that the distance between the sound source device and the plurality of sound emission holes is configured to be variable.
Thereby, the resonant frequency of a housing | casing can be changed by changing the volume in a housing | casing.

The notification device according to the eighth aspect of the present invention is:
An informing device for informing the outside by outputting sound,
A sound source device that can switch the frequency of the output sound;
A housing in which the sound source device is mounted;
A sound emission part provided with a plurality of sound emission holes penetrating the housing, guiding the sound output from the sound source device to the outside of the housing;
A sound insulating plate attached to the sound emitting unit and exposing a part of the plurality of sound emitting holes;
By moving the sound insulating plate, the total opening area of the exposed ones of the plurality of sound emitting holes is changed.
As a result, the total opening area of the exposed ones of the multiple sound emission holes changes, so that the resonance frequency of the housing changes, and the sound pressure is adjusted for each frequency of sound output from the sound source device. can do.

A notification device according to a ninth aspect of the present invention is the notification device described above,
It is desirable that the sound insulating plate is provided with a notch or an opening for exposing the plurality of sound emitting holes in a part of the plate-like member.
Thereby, the sound emission hole at the position of the notch or the opening can be exposed.

A notification device according to a tenth aspect of the present invention is the notification device described above,
It is desirable that the plurality of sound emitting holes are aligned on a straight line or arranged on a circumference.
Thereby, the sound emission hole to be exposed can be easily selected.

A notification device according to an eleventh aspect of the present invention is the notification device described above,
It is desirable that the plurality of sound emitting holes have different opening areas.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A notification device according to a twelfth aspect of the present invention is the notification device described above,
It is desirable that the opening area of the plurality of sound emitting holes continuously change.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A notification device according to a thirteenth aspect of the present invention is the notification device described above,
It is desirable that the opening area of each of the plurality of sound emitting holes is changed every predetermined number.
Thereby, the total opening area of the sound emission hole to be exposed can be changed.

A notification device according to a fourteenth aspect of the present invention is the notification device described above,
It is desirable that the distance between the sound source device and the plurality of sound emission holes is configured to be variable.
Thereby, the resonant frequency of a housing | casing can be changed by changing the volume in a housing | casing.

  ADVANTAGE OF THE INVENTION According to this invention, in the apparatus incorporating the sound source device which can switch the frequency of the sound to output, the volume adjustment mechanism which can adjust the sound pressure of each frequency can be provided.

  The above and other objects, features and advantages of the present invention will be more fully understood from the following detailed description and the accompanying drawings. The accompanying drawings are presented for purposes of illustration only and are not intended to limit the present invention.

It is a figure which shows typically the external appearance of the alerting | reporting apparatus incorporating the volume adjustment mechanism concerning Embodiment 1. FIG. It is the figure which separated the sound emission hole and the sound insulation board. It is a figure which shows the structure of the sound emission part concerning Embodiment 1, and a sound-insulation board. It is a figure which shows the sound emission part and sound insulation board at the time of rotating a sound insulation board with respect to FIG. It is a figure which shows the relationship between the resonant frequency of a housing | casing and the frequency of the sound which a buzzer outputs. It is a figure which shows the modification of the sound insulation board in the volume control mechanism concerning Embodiment 1. FIG. It is a figure which shows typically the external appearance of the alerting | reporting apparatus incorporating the volume adjustment mechanism concerning Embodiment 2. FIG. It is a figure which shows the structure of the sound emission part concerning Embodiment 2, and a sound insulation board. It is a figure which shows the modification of the sound insulation board in the volume control mechanism concerning Embodiment 2. FIG. It is a figure which shows typically the external appearance of the alerting | reporting apparatus incorporating the volume adjustment mechanism concerning Embodiment 3. FIG. It is a figure which shows typically the cross section of the alerting | reporting apparatus concerning Embodiment 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted as necessary.

Embodiment 1
A volume adjustment mechanism according to the first embodiment will be described. FIG. 1 schematically shows the appearance of a notification device 110 in which the volume adjustment mechanism 100 according to the first embodiment is incorporated. In the notification device 110, the buzzer 2 is mounted inside the housing 1. For example, the notification device 110 is configured as a device that notifies the outside of occurrence of an event or the like by outputting a sound in accordance with a signal input to the buzzer 2.

  The housing 1 is provided with a sound emitting unit 11 for guiding the sound output from the buzzer 2 to the outside of the housing 1. A sound insulation plate 12 is provided on the outer surface of the housing 1 so as to shield a plurality of sound emission holes 11A provided in the sound emission unit 11 and expose a part of the sound emission holes 11A. In this configuration, the sound emitting unit 11 and the sound insulating plate 12 constitute the volume adjusting mechanism 100.

  Hereinafter, in the figure, a surface on which the sound emitting unit 11 and the sound insulating plate 12 are provided is an XY plane, and a direction perpendicular to the X direction and the Y direction is a Z direction.

  In FIG. 2, the figure which separated the sound emission part 11 and the sound insulation board 12 is shown. As shown in FIG. 2, in the sound emission unit 11, a plurality of sound emission holes 11 </ b> A are arranged in alignment with the housing 1. The sound insulating plate 12 is provided with a notch in a part of the plate member. The sound insulating plate 12 is movably attached to the housing 1, and as the sound insulating plate 12 moves, the number of the sound emitting holes 11A that are shielded by the sound insulating plate 12 changes. Thereby, the opening area of what is exposed without being blocked by the sound insulating plate 12 among the plurality of sound emitting holes 11A is changed.

  The sound emission part 11 and the sound insulation board 12 concerning this Embodiment are demonstrated in detail. FIG. 3 shows configurations of the sound emitting unit 11 and the sound insulating plate 12 according to the first embodiment. In the present embodiment, the plurality of sound emitting holes 11 </ b> A are arranged in alignment on the circumference of the housing 1. In this example, the sound emitting holes 11A have different sizes. As shown in FIG. 3, the sound emitting hole 11 </ b> A has the largest opening area above the paper surface, and the opening area continuously decreases in the clockwise direction.

  The sound insulating plate 12 is provided with a substantially fan-shaped notch 13 in a part of the disk-shaped member, and the center of the disk-shaped member coincides with the center of the circumference where the sound emission holes 11A are arranged. The body 1 is rotatably attached. The notch 13 of the sound insulating plate 12 is provided so that three consecutive ones of the plurality of sound emitting holes 11A are exposed. As the sound insulation plate 12 rotates, the total opening area of the three exposed sound emitting holes 11A changes, so that it can be adjusted to a suitable opening area according to the frequency of the sound output by the buzzer 2.

  FIG. 4 shows the sound emitting unit 11 and the sound insulating plate 12 when the sound insulating plate 12 is rotated with respect to FIG. In this example, it can be understood that the total opening area of the three sound emitting holes 11 </ b> A exposed by the notch 13 is smaller than that in FIG. 3.

  FIG. 5 shows the relationship between the resonance frequency of the casing 1 and the frequency f of the sound output from the buzzer 2. The sound pressure of the sound having the frequency f output to the outside of the housing 1 through the sound emission hole 11 </ b> A varies depending on the resonance frequency of the housing 1. Since the resonance frequency of the housing 1 can change the total opening area of the exposed sound emitting holes 11A, the sound pressure can be maximized by adjusting the resonance frequency of the housing 1 to the frequency f. The example of FIG. 5 shows an example in which the resonance frequency decreases from the frequency f1 in the case of FIG. 3 (line III) to the frequency f2 in the case of FIG. 4 (line IV).

  In this configuration, since the total opening area of the sound emitting holes 11A exposed by rotating the sound insulating plate 12 can be changed, even if the frequency of the sound output from the buzzer 2 is switched, the sound of the frequency after switching is changed. The pressure can be easily maximized. In other words, it is possible to easily maximize the sound pressure of the sound having an arbitrary frequency output from the buzzer 2.

  In the present embodiment, the number of sound emitting holes 11A exposed by the notch 13 is three, but the number of sound emitting holes 11A exposed by the notch 13 may be any number other than three. Moreover, although it has been described that the opening area of each sound emitting hole 11A changes continuously, the opening area may be changed for every adjacent number.

  Further, the number of exposed sound emitting holes 11A may be changed. FIG. 6 shows a modification of the sound insulating plate in the volume adjusting mechanism according to the first embodiment. For example, as shown in FIG. 6, the sound insulation plate 12A and the sound insulation plate 12B overlap each other by arranging the substantially semicircular sound insulation plate 12A and the sound insulation plate 12B in an overlapping manner and rotating the sound insulation plate 12A and the sound insulation plate 12B. The area of the part 14 which does not fit can be changed. Thereby, it can be set as the structure which changes the number of the sound emission holes 11A exposed by the part 14 where the sound insulation board 12A and the sound insulation board 12B do not overlap. Even in this case, the total opening area of the exposed sound emitting holes 11A can be changed by appropriately selecting the size and number of the opening areas of the sound emitting holes 11A. In this case, even if the opening areas of the sound emitting holes 11A are the same, the total opening area of the exposed sound emitting holes 11A can be changed.

  Furthermore, this configuration is also effective for the frequency variation of the buzzer 2 and the volume variation of the housing 1 due to manufacturing errors. That is, even if the frequency of the sound source device and the volume of the casing vary, the sound pressure can be maximized regardless of variations by adjusting the total opening area of the sound emitting unit 11 with this configuration. Such adjustment may be performed at an arbitrary timing such as after replacement of the buzzer or at the time of shipping inspection.

  Furthermore, this configuration is also effective when using a plurality of notification devices 110. In other words, by setting the sound output by the buzzer to be different for each notification device and maximizing the sound pressure by adjustment, any notification device outputs sound even if multiple notification devices 110 are used. It is possible to easily identify whether or not

Embodiment 2
A volume adjustment mechanism according to the second embodiment will be described. FIG. 7 schematically shows the appearance of a notification device 210 in which the volume adjustment mechanism 200 according to the second embodiment is incorporated. As with the notification device 110, the notification device 210 has the buzzer 2 mounted inside the housing 1.

  The notification device 210 is different from the notification device 110 in the arrangement of the sound emission holes and the shape of the sound insulation plate. Hereinafter, the sound emitting hole 21A and the sound insulating plate 22 of the notification device 210 will be described. In this configuration, the sound emitting unit 21 and the sound insulating plate 22 constitute the volume adjusting mechanism 200.

  FIG. 8 shows configurations of the sound emitting unit 21 and the sound insulating plate 22 according to the second embodiment. In the present embodiment, the plurality of sound emitting holes 21A are arranged on a straight line of the casing 1, that is, aligned in the X direction of FIG. In this example, the sound emitting holes 21A have different sizes. As shown in FIG. 8, the sound emitting hole 21A has the largest opening area on the left side (X (−) side) of the drawing, and the opening area continuously decreases toward the right side (X (+) side) of the drawing. go.

  The sound insulating plate 22 is a rectangular plate-like member having the longitudinal direction in the arrangement direction of the sound emitting holes 21A, that is, the X direction, and a rectangular opening 23 is provided in part, and can be slid in the X direction. It is attached. The openings 23 of the sound insulating plate 22 are provided so that three consecutive ones of the plurality of sound emitting holes 21A are exposed. As the sound insulation plate 22 slides, the total opening area of the three exposed sound emitting holes 21A changes, so that it can be adjusted to a suitable opening area according to the frequency of the sound output by the buzzer 2.

  In this configuration, since the total opening area exposed by the opening 23 can be changed, even if the frequency of the sound output from the buzzer 2 is switched, the frequency of the frequency after switching is changed as in the first embodiment. Sound pressure can be easily maximized. In other words, it is possible to easily maximize the sound pressure of the sound having an arbitrary frequency output from the buzzer 2.

  In the present embodiment, the number of sound emitting holes 21A exposed by the openings 23 is three, but the number of sound emitting holes 21A exposed by the openings 23 may be any number other than three. Moreover, although it has been described that the opening area of each sound emitting hole 21A changes continuously, the opening area may be changed for every adjacent number.

  Further, the number of sound emitting holes 21A exposed from the sound insulating plate 22 may be changed. FIG. 9 shows a modification of the sound insulating plate in the volume adjusting mechanism according to the second embodiment. For example, as shown in FIG. 9, the total opening area may be changed by sliding a simple rectangular sound insulating plate 24 in the direction and changing the number of sound emitting holes 11A exposed without being blocked.

Embodiment 3
A volume adjustment mechanism according to the third embodiment will be described. FIG. 10 schematically shows the appearance of a notification device 310 in which the volume adjustment mechanism 300 according to the third embodiment is incorporated. The notification device 310 is a modification of the notification device according to the first embodiment. In the present embodiment, the volume adjustment mechanism 300 has a configuration that can change the distance between the buzzer 2 mounted inside the housing 1 and the sound emission holes and sound insulation plates.

  The sound volume adjusting mechanism 300 includes the rotation cover 32, the rotation cover attachment portion 33, the urging spring 34, and the sound insulating plate 12. In this configuration, the rotation cover 32, the rotation cover attachment portion 33, and the urging spring 34 constitute the sound emitting portion 31.

  The rotation cover 32 is rotatably attached to a rotation cover attachment portion 33 provided in a part of the housing 1. The sound emission hole 11A is provided in the rotary cover 32 with the same configuration and arrangement as in the first embodiment. The sound insulating plate 12 is attached to the rotating cover 32 with the same configuration and arrangement as in the first embodiment with respect to the sound emitting hole 11A.

  FIG. 11 schematically shows a cross section of a notification device 310 according to the third embodiment. The rotary cover 32 is configured as a member having a circular surface 32A provided with the sound emission hole 11A and a cylinder 32B. The rotating cover attaching portion 33 of the housing 1 is provided with an opening 33A that guides the sound from the buzzer 2 to the circular surface 32A of the rotating cover 32. The buzzer 2 is attached to the bottom of the rotary cover attachment portion 33 so as to face the circular surface 32A.

  A side wall 33B surrounding the cylinder 32B is provided outside the opening 33A to fix the position of the cylinder 32B. A screw 32C is provided on the outer peripheral surface of the cylinder 32B, and a screw 33C screwed with the screw 32C is provided on the inner peripheral surface of the side wall 33B. A side wall 33D is provided inside the threaded side wall 33B and the cylinder 32B. A biasing spring 34 that biases the rotary cover 32 in the Z direction is inserted into a space surrounded by the side wall 33B, the side wall 33D, and the cylinder 32B.

  With the above configuration, the position of the rotary cover 32 in the Z direction can be changed by rotating the rotary cover 32 with respect to the rotary cover attachment portion 33. Thereby, it is possible to further adjust the resonance frequency of the housing 1 by changing the volume inside the housing 1. That is, the resonance frequency of the housing 1 can be adjusted more precisely, and the range of the number of frequencies that can be adjusted can be expanded.

Other Embodiments The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. For example, in the above-described embodiment, it has been described that the frequency of the sound output by the buzzer can be switched, but this is merely an example. For example, it goes without saying that a buzzer unit provided with a plurality of buzzers having different frequencies of sound to be output may be used.

  The configuration described in Embodiment 3 is merely an example, and other configurations can be applied as appropriate as long as the distance between the sound emitting unit and the buzzer can be changed.

DESCRIPTION OF SYMBOLS 1 Case 2 Buzzer 11, 21, 31 Sound emission part 11A, 21A Sound emission hole 12, 12A, 12B, 22, 24 Sound insulation board 13 Notch part 23 Opening part 32 Rotating cover 32A Circular surface 32B Cylinder 32C, 33C Screw 33 Rotating cover attaching portion 33A Opening portion 33B, 33D Side wall 34 Biasing spring 100, 200, 300 Volume adjusting mechanism 110, 210, 310 Notification device

Claims (14)

A volume adjustment mechanism that adjusts the sound pressure of sound from a sound source device that is mounted inside the housing and can switch the frequency of the sound to be output,
A sound emission part provided with a plurality of sound emission holes penetrating the housing, guiding the sound output from the sound source device to the outside of the housing;
A sound insulating plate attached to the sound emitting unit and exposing a part of the plurality of sound emitting holes;
By moving the sound insulating plate, the total opening area of the exposed ones of the plurality of sound emitting holes changes.
Volume adjustment mechanism. The sound insulating plate is provided with a notch or an opening for exposing the plurality of sound emitting holes in a part of the plate-like member.
The volume adjusting mechanism according to claim 1. The plurality of sound emitting holes are aligned on a straight line or arranged on a circumference.
The volume adjustment mechanism according to claim 2. The plurality of sound emitting holes have different opening areas.
The volume adjustment mechanism according to claim 3. The plurality of sound emitting holes continuously change in opening area.
The volume adjustment mechanism according to claim 4. The opening area of the plurality of sound emitting holes changes every predetermined number.
The volume adjustment mechanism according to claim 3. The distance between the sound source device and the plurality of sound emission holes is configured to be variable,
The volume adjustment mechanism according to any one of claims 1 to 6. An informing device for informing the outside by outputting sound,
A sound source device that can switch the frequency of the output sound;
A housing in which the sound source device is mounted;
A sound emission part provided with a plurality of sound emission holes penetrating the housing, guiding the sound output from the sound source device to the outside of the housing;
A sound insulating plate attached to the sound emitting unit and exposing a part of the plurality of sound emitting holes;
By moving the sound insulating plate, the total opening area of the exposed ones of the plurality of sound emitting holes changes.
Notification device. The sound insulating plate is provided with a notch or an opening for exposing the plurality of sound emitting holes in a part of the plate-like member.
The notification device according to claim 8. The plurality of sound emitting holes are aligned on a straight line or arranged on a circumference.
The notification device according to claim 9. The plurality of sound emitting holes have different opening areas.
The notification device according to claim 10. The plurality of sound emitting holes continuously change in opening area.
The notification device according to claim 11. The opening area of the plurality of sound emitting holes changes every predetermined number.
The notification device according to claim 10. The distance between the sound source device and the plurality of sound emission holes is configured to be variable,
The notification device according to any one of claims 8 to 13.

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