JPH02108329A - Acoustic equipment - Google Patents

Abstract

PURPOSE:To prevent a foreign material from infiltrating through a sound hole, to increase the aperture ratio of the sound hole and to improve a tone quality by providing an open/close cover on the sound hole part of a cabinet, and opening/closing the cover by means of a change-over switch. CONSTITUTION:When a switch S11 of a switch 4 is changed-over to an EP1, a sound output is applied from an IC to an earphone terminal 7. Simultaneously, a switch S12 is changed-over to an EP2, and a current is made flow through a resistance R1 to the IC. Thus, when the earphone is used, current consumption is reduced, and a battery life is prolonged. When the switch S11 is changed-over on an SP1 side, a sound output is applied from the IC to a speaker, simultaneously the switch S12 is changed on an SP2 side, and current restriction to the IC is canceled. When the switch 4 is on an earphone terminal side (a), a sound hole open/close cover 5 closes a hole 2', it opens the hole 2' when the switch 4 is on the speaker side, and dust proof effect and tone quality improvement can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an audio device that includes a speaker and an earphone terminal in a cabinet.

[Conventional technology]

Conventional general audio equipment, especially small radio receivers,
Many devices include a speaker, an earphone terminal, and a changeover switch that switches audio output to the speaker and earphone terminal.

The cabinet of such audio equipment has a sound hole portion provided with a sound hole for outputting sound from a speaker. Further, the changeover switch is used to reduce current consumption when using earphones, and to switch the output of a low frequency amplifier between a speaker and an earphone.

(Problems to be Solved by the Invention) However, in these audio devices, the sound holes in the cabinet remain open even when earphones are used and no sound is output from the speakers.

For this reason, since it is necessary to prevent the intrusion of foreign matter, the aperture ratio of the sound holes is set small, which poses a problem of adversely affecting sound quality.

Therefore, an object of the present invention is to provide an acoustic device that can improve sound quality by increasing the aperture ratio of the sound holes while preventing foreign matter from entering through the sound holes of the speaker.

[Means to solve the problem]

In the audio equipment of the present invention, a sound hole opening/closing cover is provided in the sound hole section of the cabinet, and when the changeover switch is on the speaker side, the sound hole opening/closing cover is in an open state, and when the changeover switch is on the earphone terminal side, the sound hole opening/closing cover is in an open state. The sound hole opening/closing cover and the changeover switch are connected so that the sound hole is in the closed state.

[For production]

According to the configuration of the present invention, since the sound hole opening/closing cover is provided in the sound hole portion of the cabinet, the sound hole portion can be opened and closed by the sound hole opening/closing cover. Then, this sound hole opening/closing cover was connected to a changeover switch, so that when the changeover switch was on the speaker side, the sound hole opening/closing cover opened, and when the changeover switch was on the earphone terminal side, the sound hole opening/closing cover was closed. When the speaker is not in use, the sound hole can be closed using the sound hole opening/closing cover.

〔Example〕

An embodiment of the radio receiver of the present invention will be explained based on FIGS. 1 to 4.

As shown in FIG. 1, this radio receiver is equipped with a cabinet 1, a speaker 3, an earphone terminal (not shown), and a changeover switch 4, and a sound hole opening/closing cover 5 is provided in the sound hole section 2 of the cabinet 1. There is. The sound hole opening/closing cover 5 is arranged so as to be slidable in the switching operation direction of the changeover switch 4, and is connected to the changeover switch 4. 6 indicates a printed wiring board.

The changeover switch 4 and the sound hole opening/closing cover 5 are connected by fitting the operating part 4a of the changeover switch 4 into the connecting part 5a of the sound hole opening/closing M5.

As shown in Figure 4, the electric circuit of this radio receiver consists of a signal source SG consisting of a modulation circuit, a detection circuit, etc., a low frequency amplifier IC, coupling capacitors C+ and Cx, and a resistor R.
3, a selector switch 4, a speaker 3, and an earphone terminal 7.

The changeover switch 4 includes a switch S11 for switching the audio output from the low frequency amplifier IC to the speaker 3 and the earphone terminal 7, and a switch for limiting the current of the low frequency amplifier IC when the audio output is switched to the earphone terminal 7. It is equipped with S1□.

Switch S and switch SIX are interlocked.

The operation of this radio receiver will be explained below.

When the changeover switch 4 is operated and the switch S of the changeover switch 4 is switched to the EPI side, audio output is applied to the earphone terminal 7 from the low frequency amplifier LC. At the same time, switch S+t goes to BP.

current flows to the low frequency amplifier IC via the resistor R3. As a result, when using the earphones (not shown), current consumption is reduced and battery life is extended. Also, the changeover switch 4 is changed over, and the switch S is set to SP.
, the low frequency amplifier I is connected to speaker 3.
Audio output is added from C, and at the same time switch 5lffi
switches to the S P z side and releases the current limit to the low frequency amplifier IC.

When the changeover switch 4 is on the earphone terminal side a, the sound hole opening/closing cover 5 closes the sound hole 2' of the sound hole portion 2, as shown in FIG. When the selector switch 4 is on the speaker side, the sound hole opening/closing cover 5 opens the sound hole 2', as shown in FIG.

In this way, in this radio receiver, the sound hole portion 2 of the cabinet 1 can be opened and closed using the sound hole opening/closing lid, and the sound hole portion 2 can be kept closed when the speaker 3 is not used. As a result, the speaker 3 is protected by the sound hole opening/closing cover 5, the aperture ratio of the sound hole 2' can be increased, and the sound quality can be improved. Furthermore, compared to conventional radio receivers, it is possible to improve the dustproof and waterproof effects.

Furthermore, since the sound hole opening/closing cover 5 can be slid to open and close and the changeover switch 4 can be changed over, the operation is easy. In addition, by changing the color of the sound hole section 2 to the color of the cabinet 1 and the sound hole opening/closing cover 5, the sound hole opening/closing cover 5 can be
The open/closed state of the changeover switch 4 can be clearly confirmed, and the switching state of the changeover switch 4 can be seen at a glance.

Although this embodiment has been explained using a radio receiver, it can also be applied to other audio equipment such as a tape recorder or compact disc player equipped with a speaker, an earphone terminal, and a changeover switch.

Further, in this embodiment, the sound hole opening/closing M5 is slid in the switching operation direction of the changeover switch 4, but the opening/closing operation of the sound hole opening/closing cover 5 is not limited to sliding.

〔Effect of the invention〕

In the radio receiver of the present invention, since the sound hole opening/closing cover is provided in the sound hole section of the cabinet, the sound hole section can be opened and closed by the sound hole opening/closing cover. Then, the sound hole opening/closing cover was connected to the selector switch so that when the selector switch was on the speaker side, the sound hole opening/closing cover opened, and when the selector switch was on the earphone terminal side, the sound hole opening/closing cover was closed. When not in use, the sound hole portion can be closed by the sound hole opening/closing lid, and foreign matter can be prevented from entering through the sound hole of the speaker. As a result, the aperture ratio of the sound holes can be increased, and the sound quality can be improved.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of an embodiment of the invention, and FIG.
3 is a side sectional view of the sound hole shown in FIG. 1 with the sound hole closed, FIG. 4 is a side sectional view of the sound hole shown in FIG. 1 with the sound hole opened, and FIG. 4 is an electrical circuit diagram of FIG. ■...Cabinet, 2...Sound hole part, 3...Speaker, 4...Selector switch, 5...Sound hole opening/closing cover, 7
...Earphone terminal Figure 1 Figure 2 Figure 4 Figure 3

Claims (1)

[Claims] In an audio device comprising a cabinet having a sound hole, a speaker, an earphone terminal, and a changeover switch for switching audio output to the speaker and the earphone terminal, a sound hole opening/closing cover is provided in the sound hole of the cabinet, The sound hole opening/closing lid and the sound hole opening/closing lid are arranged so that when the changeover switch is on the speaker side, the sound hole opening/closing lid is in an open state, and when the changeover switch is on the earphone terminal side, the sound hole opening/closing lid is in a closed state. Audio equipment characterized by connecting changeover switches.