JPH11205877A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient output sound pressure with a small-sized loud speaker, despite of its being a waterproof structure. SOLUTION: A receiver is provided with a loudspeaker 15 mounted on a television main body case 11 and a vibration thin film 16 stretching over an opening spatially continuing to a rear side of a speaker 15 that is coplanar as an aperture of the speaker 15 of the television main body case 11, and a waterproof structure is adopted for the speaker 15 and the vibration thin film 16 with respect to the television main body case 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal television set, a portable radio receiver, etc.
The present invention relates to a waterproof receiving device having a speaker.

[0002]

2. Description of the Related Art In a receiving device such as a liquid crystal television or a radio receiver which is fixedly installed on a wall surface of a bathroom or used outdoors and has a waterproof structure, a hermetically sealed structure is provided by a main body case to make the inside airtight. The rear side of the speaker is sealed in a case, and only the front side of the speaker is exposed to the outside to emit sound.

[0003]

In the main body case sealed by the waterproof structure as described above, the volume of the space on the rear side of the speaker is fixed. For this reason, an operational resistance is generated in the vibration of the speaker cone, which is a factor of deteriorating the acoustic output characteristics of the speaker.

In order to improve the output sound pressure of the speaker to a required level, it is conceivable to increase the size of the speaker and increase its surface area. However, this would increase both the volume and weight of the entire receiver. Becomes

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a receiver capable of obtaining a sufficient output sound pressure with a smaller speaker while having a waterproof structure. To provide.

[0006]

According to the first aspect of the present invention,
A speaker unit attached to the device body case, and a vibrating thin film stretched on an opening surface spatially continuous with the back surface of the speaker unit, which is coplanar with the opening of the speaker unit of the device body case. The speaker unit and the vibrating thin film are provided in a waterproof structure with respect to the device body case.

With such a configuration, the spatial volume on the rear side of the speaker can be varied by the vibrating thin film, so that the operating resistance caused by the vibration of the speaker cone can be reduced, and the factors that degrade the sound output characteristics of the speaker can be reduced. In addition, vibration from the rear side of the speaker resonates inside the device body case, and is transmitted to the outside through the vibrating thin film. As a result, a small speaker with a waterproof structure is obtained. It is possible to obtain a sufficient output sound pressure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a liquid crystal television set on a bathroom wall or the like will be described below with reference to the drawings. FIG. 1 shows an external configuration in an installed state. As shown, the liquid crystal television of the present invention mainly includes a power supply unit 1 and a display unit 2. The power supply unit 1 has a trapezoidal housing 1a also serving as a plug to be attached to the outlet 3, and a coaxial cable 4 from an antenna (not shown) is connected to one side of the housing 1a. A coaxial cable 5 for superposing and supplying a power supply voltage and an RF signal to the unit 2 is connected.

The coaxial cable 5 extends, for example, through the wall surface W to the display unit 2 which is fixedly installed. On the front surface of the display unit 2, a display unit 6 using a liquid crystal display panel is provided. A sound emitting section 7 having a large number of slits is provided.

In the power supply unit 1, however, the AC commercial voltage is rectified to a predetermined DC voltage and stepped down, and then the RF signal obtained from the antenna is superimposed and guided to the coaxial cable 5.

On the display unit 2 side, the DC voltage
The components of the signal are separated and extracted, and the DC voltage
A desired frequency is selected from the F signal, and a television broadcast program receiving operation is executed.

FIG. 2 is a perspective view showing a partial external structure of the display unit 2. As shown, a front decorative case 12 made of a resin is fitted to a television body case 11 by its elasticity. To be installed.

The TV main body case 11 is screwed to a main body base 13 to be described later and has a waterproof structure so as to keep the inside airtight. A liquid crystal display constituting the display section 6 is provided at the center of the front surface and almost entirely on the left side. A panel 14 is provided, a speaker 15 is provided at a lower portion on the right side, and a vibrating thin film portion 16 is provided at an upper portion thereof so as to be exposed to the outside. Vibration thin film part 16
Is formed by fusing a waterproof vibration thin film, for example, a polyester having a thickness of about 180 [μm] or less, so as to cover the entire surface of the opening provided in the TV main body case 11. It is spatially continuous with the back side of the speaker 15.

The exterior decorative case 12 is made of resin and has a structure in which a portion corresponding to the liquid crystal display panel 4 of the television body case 11 has a large opening, and a portion corresponding to the speaker 5 and the vibrating thin film portion 6 has a large number of slits. And can be easily removed from the television main body case 1 for cleaning or the like.

FIG. 3 is a cross-sectional view showing a state in which the TV main body case 11 and the decorative cosmetic case 12 are assembled to a main body base 13 for directly fixing and installing the TV main body case 11 and the main body. As described above, the back surface side of the speaker 15 and the vibrating thin film portion 16 are spatially continuous inside the interior sealed with the base 13.

In the above-described configuration, when a television broadcast is received and broadcast audio is output from the speaker 15, the back side of the speaker 15 and the vibrating thin film portion 16 are in close proximity as shown in FIG. It is spatially continuous, and when the speaker cone of the speaker 15 vibrates, the vibrating thin film portion 16 vibrates with the vibration, so that the TV body case 1
1 and the volume of space in the main body base 13 are variable. Therefore, when the space volume is fixed, it is possible to sufficiently reduce the operating resistance caused by the vibration of the speaker cone, reduce the factors that degrade the sound output characteristics of the speaker 15, and sufficiently exhibit its performance. be able to.

The vibration from the back side of the speaker 15 resonates inside the case composed of the television main body case 11 and the main body base 13, and the vibrating thin film portion 16 is moved as shown by arrows III and III in FIG. The sound is transmitted to the outside and transmitted to the outside. Therefore, the output sound pressure of the speaker 15 is further improved. As a result, it is possible to obtain a sufficient output sound pressure with a small speaker 15 while having a waterproof structure as a whole.

Although the above embodiment has been described with reference to the case where the present invention is applied to a liquid crystal television fixedly installed on a wall surface of a bathroom or the like, the present invention is not limited to this. Any device that emits sound from a speaker, for example, a radio receiver, an external device attached to the entrance of an intercom, etc., can be applied regardless of what is fixedly installed inside and outside the house or portable. Needless to say. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0019]

According to the first aspect of the present invention, since the spatial volume on the back side of the speaker is variable by the vibrating thin film, the operating resistance caused by the vibration of the speaker cone is reduced and the acoustic output characteristics of the speaker are reduced. And vibration from the back side of the speaker resonates inside the device body case, and is output as sound through the vibrating thin film. As a result, the waterproof structure is achieved. A sufficient output sound pressure can be obtained with a small speaker.

[Brief description of the drawings]

FIG. 1 is a view showing an external configuration in an installed state according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a partial external configuration according to the embodiment;

FIG. 3 is an exemplary sectional view showing the structure inside the main body case according to the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Power supply unit 2 ... Display unit 3 ... Outlet 4 ... Coaxial cable 5 ... Coaxial cable 6 ... Display part 7 ... Sound emission part 11 ... TV main body case 12 ... Exterior cosmetic case 13 ... Main body base 14 ... Liquid crystal display panel 15 ... Speaker 16: vibrating thin film W: wall surface

Claims (1)

[Claims] 1. A speaker unit attached to an apparatus body case, and an opening surface spatially continuous with a back surface of the speaker unit, which is coplanar with an opening of the speaker unit of the apparatus body case. A receiver comprising: a vibrating thin film; wherein the speaker unit and the vibrating thin film are provided in a waterproof structure with respect to the device body case.