JPH0520488U - Closed housing - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a hermetically sealed housing that can efficiently transmit the sound emitted from the sound source provided inside the housing to the outside of the housing and that has a clear direction of the sound emitted from the housing. [Structure] A part of the casing serves as a diaphragm 5 for transmitting the sound generated from the buzzer 15 to the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hermetically sealed housing in which a sound source such as a buzzer is attached.

[0002]

[Prior Art]

 For electronic devices installed outdoors, it is necessary to make the case hermetically sealed to prevent water and dust.

Conventionally, when a sound source such as a buzzer is provided inside such a sealed casing and a sound signal is sent to the outside, the sound is muffled and the sound transmitted to the outside is extremely small. There was a problem. In this case, if a large buzzer was installed in the housing to increase the volume of sound transmitted to the outside, there was a problem that the housing became large and power consumption increased. In addition, since the direction of the sound emitted from the case is not clear, it is difficult to determine which case the sound is coming from when installing multiple cases of this type side by side.

[0004]

[Problems to be solved by the device]

 As described above, in the closed casing, there is a problem that the sound emitted from the sound source provided inside is difficult to be transmitted to the outside of the casing, and the direction of the sound emitted from the casing is not clear.

The present invention has been made to solve such a conventional drawback, and can efficiently transmit the sound emitted from the sound source installed inside the housing to the outside of the housing, and the direction of the sound is clear. It is an object of the present invention to provide a simple sealed housing.

[0006]

[Means for Solving the Problems]

 According to the present invention, in a closed casing having a sound source inside, a part of the casing is a diaphragm for transmitting the sound generated from the sound source to the outside.

[0007]

[Action]

 In the present invention, the sound generated from the sound source causes the diaphragm, which is a part of the housing, to vibrate, and the vibration of the diaphragm transmits the sound to the outside.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a diagram for explaining the first embodiment. The closed casing 1 includes a casing body 3 formed of a thick metal plate and a diaphragm 5 that closes an opening of the casing body 3. The vibrating plate 5 is formed of a metal plate, and is composed of a thin vibrating portion 7 and a thick mounting portion 9 surrounding the vibrating portion.

The vibrating plate 5 has the vibrating portion 7 positioned at the opening of the housing body 3, and the O-ring 11 surrounding the opening is sandwiched between the housing body 3 and the mounting portion 9 so that the mounting portion 9 is It is fixed to the housing body 3 with screws 12 and nuts 13. A buzzer 15, which is a sound source, is arranged to face the vibrating portion 7 of the vibrating plate 5. The mounting portion 16 of the buzzer 15 is fastened together with the mounting portion 9 by the screw 12 and the nut 13. ing.

According to the above structure, the thin vibrating portion 7 is efficiently vibrated by the sound generated from the buzzer 15, and the vibration of the vibrating portion 7 transmits the sound to the outside. Therefore, the sound generated from the sound source is efficiently transmitted to the outside of the housing 1, and the sound emitted from the closed housing 1 is the sound generated from the vibrating portion 7 of the diaphragm 5, so that the direction of the sound is clear. Becomes

The vibrating portion 7 needs to be thin so that it can easily vibrate with sound, but the shape of the vibrating portion 7 is adjusted so that the resonance frequency of the vibrating portion 7 matches the frequency of the buzzer 15. If the plate thickness is set or the frequency of the buzzer 15 is set to match the resonance frequency of the vibrating section 7, the sound of the buzzer 15 is transmitted to the outside most efficiently.

2 and 3 are views showing a second embodiment of the present invention. In this example, the vibrating plate is not the metal plate but the plastic sheet 5A, so that the sound generated from the buzzer 15 can be transmitted to the outside of the housing 1A more efficiently than in the first embodiment. It is composed.

As shown in FIG. 3, a rubber-like packing 18 is integrally provided around the plastic sheet 5A. In the plastic sheet 5A, the rubber-like packing 18 is provided. It is attached to the housing body 3 in a state of closing the opening of the housing body 3 by being sandwiched between the inner wall of the housing and the mounting bracket 20.

Since the plastic sheet 5A is inferior in strength to a metal plate, an armored door 22 for protecting the plastic sheet 5A is provided on the outer surface of the housing body 3. The mounting bracket 20 and the buzzer 15 are fastened to the housing body 3 together with screws 12 and 13. Other functions and effects are similar to those of the first embodiment.

In the above embodiment, the case where a metal plate or a plastic sheet made of another member is used as the vibration plate forming a part of the housing has been described, but the present invention is not limited to this. For example, as shown in FIG. 4, a part of the metal plate 5B forming the housing 3A may be formed thinner than other parts to form a diaphragm.

[0017]

[Effect of the device]

 As described above, in the hermetically sealed housing of the present invention, the sound source provided inside the housing vibrates the diaphragm that forms a part of the housing. The sound of the sound source can be efficiently transmitted to the outside of the housing, and the direction of the sound emitted from the housing becomes clear.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a hermetically sealed housing according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a hermetically sealed housing according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a diaphragm used in the closed casing of FIG.

FIG. 4 is a sectional view of a main part of a hermetically sealed case according to a third embodiment of the present invention.

[Explanation of symbols]

 1, 1A ... Hermetically sealed housing 5, 5A ... Diaphragm 15 ... Buzzer (sound source)

Claims (1)

[Scope of utility model registration request] 1. A hermetically sealed housing having a sound source inside, wherein a part of the housing is a diaphragm for transmitting a sound generated from the sound source to the outside. .