JPH0737394Y2 - Telephone - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention connects a speaker amplifier built in a main body or a stand and a speaker built in a handset (handset) with a curl cord to make an on-hook call and
The present invention relates to a telephone that can be used by selecting an off-hook call, and particularly to a telephone that prevents a decrease in speaker output level due to the impedance of a curl cord.

[Prior Art] In a conventional telephone, since the speaker amplifier in the main body and the speaker in the handset are connected by a curl cord, the audio signal from the speaker amplifier is curled regardless of whether the call is on-hook or off-hook. Is sent to the speaker in the handset via.

The impedance of the speaker in the handset is usually 4.8Ω
On the other hand, the impedance of the curl cord is relatively high at 2-3 Ω at a cord length of about 2 m.

Therefore, there is a problem that the signal output from the speaker amplifier is attenuated by the impedance of the curl cord and the output level from the speaker is lowered.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a telephone capable of preventing a decrease in speaker output regardless of the impedance of the curl cord.

[Means for Solving the Problems] In order to achieve the above object, a telephone of the present invention is a telephone including a main body, a handset having a speaker built therein, and a stand on which the handset is mounted. A speaker amplifier that outputs an audio signal according to a received signal built in the speaker, the speaker to which the audio signal output from the speaker amplifier is supplied, a curl cord that connects the speaker amplifier and the speaker, and an on-hook The audio signal level lowering prevention means for connecting the speaker amplifier and the speaker and short-circuiting the curl cord at times is provided, and the audio level lowering prevention means is provided in the positive and negative connection terminals provided in the handset and the stand. A positive / negative connection terminal, and a positive / negative terminal provided on the handset when the handset is placed on the stand. The negative connection terminal and the positive and negative connection terminals provided on the stand are in contact with each other to connect the speaker amplifier and the speaker, and the positive and negative connections provided on the handset when the handset is lifted off the stand. The terminal and the positive and negative connection terminals provided on the mounting table are not in contact with each other, and the speaker amplifier and the speaker are connected by a curl cord.

A telephone in which one of the connection terminal provided on the handset and the connection terminal provided on the stand is formed in a flat plate quadrangular shape and the other is formed in a flat plate spring shape.

A telephone in which one of the connection terminal provided on the handset and the connection terminal provided on the stand is formed into a flat plate circular shape and the other is formed into a conical projection.

A telephone in which one of the connection terminal provided on the handset and the connection terminal provided on the stand is formed in a rectangular plate shape and the other is formed in a pin-shaped projection.

A convex portion is formed on one of the handset and the stand, and a concave portion that engages with the convex portion when on-hook is formed on the other side, and the connection terminal provided on the handset and the stand. One of the provided connection terminals is provided at the tip of the convex portion, and the other is provided at the bottom surface of the concave portion.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) are cross-sectional views of the main part of the telephone in the present embodiment, and FIG. 1 (a) is a vertical cross-sectional view showing a state in which a handset is placed on a stand (on-hook state), FIG. 1 (b) is a vertical cross-sectional view showing a state where the stand and the handset are separated (off-hook state).

In these drawings, 10 is a telephone, 20 is a handset, and 30 is a handset.
Is a table and 40 is a main body. The speaker 206 and the speaker amplifier 402 are provided in the handset 20 and the main body 40, respectively.
Connected by curl cord 50. Convex parts 302a, 302
b is formed on the upper part of the stand 30, and the connection terminals 304a and 304b are provided at the tips of the convex portions 302a and 302b, respectively. The speaker amplifier 402 includes a ten-side output terminal 402a and a one-side output terminal 402b, which are connected to the connection terminals 304a and 304b, respectively. At the bottom of the handset 20, there are concave portions 202a and 302b corresponding to the concave portions 202a and 302b, respectively.
a, 202b are formed. The connection terminals 204a, 204b are provided inside the recesses 202a, 202b, respectively, and the connection terminals 304a, 304a of the mounting table 30.
It corresponds to 304b. Each speaker 206 has a connection terminal 204
Ten side input terminal 206a connected to a, 204b, one side input terminal 206
equipped with b.

The connection terminals 304a, 304b and the connection terminals 204a, 204b constitute an audio signal level reduction prevention means SW1 for short-circuiting the curl cord 50 when on-hook. That is, as shown in FIG. 1 (a), when the handset 20 is placed on the stand 30, the concave portions 202a, 202b and the convex portions 302a, 302b are engaged with each other, and the on-hook state is established. Become. In this on-hook state, the connection terminals 204a and 204b of the handset 20 and the connection terminals 304a and 304b of the stand 30 are connected to each other, so that the speaker 206 in the handset 20 is electrically connected to the speaker amplifier 402 in the main body 40. Connected. Therefore, the audio signal from the speaker amplifier 402 is sent to the speaker 206 without passing through the curl code 50. In this way, the impedance of the curl cord 50 is short-circuited, the output of the audio signal from the speaker amplifier 402 does not decrease, and the connection terminals 204a, 204b, 304a, 304b serve to prevent the output of the audio signal from decreasing. Fulfill

Further, as shown in FIG. 1B, when the telephone 10 is in the off-hook state, that is, when the handset 20 is separated from the stand 30, the connection terminals 204a and 204b are respectively connected to the connection terminals 304a and 30a.
The speaker 206 and the speaker amplifier 402 are connected by the curl cord 50 in a non-contact state with 4b. This is the same as the conventional telephone, the audio signal from the speaker amplifier 402 is passed through the curl cord 50 to the speaker 20.
It will be sent to 6 so it will not be interrupted.

FIG. 2 shows the audio signal level during the on-hook call shown in FIG. 1 (a) and the audio signal level during the off-hook call shown in FIG. 1 (b).

In the figure, the horizontal axis represents the output frequency of the speaker amplifier 402, and the vertical axis represents the deterioration amount of the audio signal level.

Curve A is the audio signal level in the on-hook state of FIG. 1 (a) (this level is displayed as a reference value). In this state, the impedance of the speaker 206 is 4.8Ω.

A curve B shows the audio signal level (-2 dB) in the off-hook state of FIG. 1 (b), and the impedance of the speaker 206 is 8Ω. The audio signal level on the curve B is 2 dB lower than the reference value.

Furthermore, the curve C shows that the impedance of the speaker 206 is 4
Is the audio signal level in the off-hook state at Ω,
It is 4 dB lower than the reference value.

This FIG. 2 shows how the audio signal level drops when the audio signal level drop prevention means SW1 is not used.

3 (a) to 5 (a) show connection terminals of the handset 20.
FIGS. 3 (b) to 5 (b) are views showing the shapes of the connection terminals 304a, 304b of the bases 204a, 204b and the mounting base 30, with the respective connection terminals attached to the handset 20 and the mounting base 30. FIG. FIG.

In FIG. 3 (a), the connection terminals 204a and 204b are shown as flat plate quadrangular shapes, and the connection terminals 304a and 304b are flat plate spring shapes (only one of each terminal is shown). , 204b to the handset 20 and the connection terminals 304a, 30
A diagram in which 4b is installed on the stand 30 is shown in FIG. 3 (b).

Further, in FIG. 4 (a), the connection terminals 204a and 204b are flat plate-shaped and the connection terminals 304a and 304b are conical projections. Furthermore, in FIG. 5 (a), the connection terminal 204
The a and 204b are shown in the shape of a rectangular plate, and the connection terminals 304a and 304b are shown as pin-shaped protrusions. These connection terminals 204a, 204b and 304a, 304b are installed in the telephone as shown in FIGS. 4 (b) and 5 (b).

FIG. 6 is a block diagram of the telephone according to this embodiment.

In the figure, the handset 20 includes a hook switch SW in addition to the speaker 206 and the sound signal level reduction preventing means SW1.
2, Stand detection switch SW3, Receiver 208, Microphone 210
Is equipped with. On the other hand, the main body 40 is not only the speaker amplifier 402, but also the CPU 404, speaker / receiver switching device 4
06, and a transmission circuit 408.

The outputs of hook switch SW2 and stand detection switch SW3 are connected to CPU404, and speaker / receiver switch 40
Reference numeral 6 switches between the speaker 206 and the receiver 208 according to the output of the CPU 404 and the received signal. The transmission circuit 408 transmits the audio signal from the microphone 210 as a transmission signal and sends it. The speaker / receiver switch 406 is a speaker 2 as shown in Table 1.
The reception signal is sent to 06 and the receiver 208.

FIG. 7 is a front sectional view of the wired handset 20 and the stand 30.

Figure 8 shows the handset 20 installed in the console of the car.
FIG. 9 is a view showing the stand 30 and FIG. 9 is a view when used as a mobile phone.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the speaker amplifier 402 is not installed in the main body 40 but in the stand 30. May be provided, the convex portions 302a, 302b and the concave portions 202a, 20
2b may be replaced with each other.

Further, the connection terminals 204a, 204b, 304a, 304b are shown in FIG. 3 (a).
~ Shapes other than those shown in Fig. 5 (a) may be used.

[Effect of the Invention] As described above in detail, according to the telephone of the present invention,
The voice signal level drop preventing means can eliminate the drop in output due to the impedance of the curl cord during an on-hook call.

[Brief description of drawings]

1 (a) and 1 (b) are cross-sectional views of a main part of a telephone in an embodiment of the present invention, and FIG. 1 (a) is a vertical cross-sectional view showing a state in which a handset is placed on a stand. (B) is a longitudinal sectional view showing a state in which the stand and the handset are separated from each other. FIG. 2 is a diagram showing the amount of voice signal level deterioration during an on-hook call and an off-hook call, and FIG. 3 (a) is an embodiment of a connection terminal which is a voice signal level drop preventing means installed in the telephone of the present invention. Showing the shape of FIG. 3, FIG.
Is a diagram of an embodiment in which the connection terminal of FIG. 3 (a) is installed on a handset and a stand, and FIG. 4 (a) is a diagram showing the shape of the second embodiment of the connection terminal, and FIG. 4 (b). ) Is a diagram of an embodiment in which the connection terminal of FIG. 4 (a) is installed on a handset and a stand, and FIG. 5 (a) is a diagram showing the shape of the connection terminal of the third embodiment, FIG.
FIG. 6 (b) is a diagram showing an embodiment in which the connection terminals of FIG. 5 (a) are installed on a handset and a stand, and FIG. 6 is a block diagram of an embodiment showing the structure of a telephone of the present invention. FIG. 8 is a front sectional view of a telephone of the present invention, FIG. 8 is a diagram showing an application example of the telephone of the present invention, and FIG. 9 is a diagram showing a second application example of the telephone of the present invention. 10: Telephone 20: Handset 30: Stand 40: Main unit 50: Curl cord 204a, 204b: Connection terminal 304a, 304b: Connection terminal 206: Speaker 402: Speaker amplifier

Claims (5)

[Scope of utility model registration request] 1. A telephone having a main body, a handset having a built-in speaker, and a stand for mounting the handset, wherein the speaker outputs an audio signal in response to a received signal built in the stand or the main body. An amplifier, the speaker to which the audio signal output from the speaker amplifier is supplied, a curl cord connecting the speaker amplifier and the speaker, and a curl cord short-circuited by connecting the speaker amplifier and the whip car during on-hook And a voice signal level reduction prevention means, wherein the voice level reduction prevention means is constituted by positive and negative connection terminals provided on the transceiver and positive and negative connection terminals provided on the stand, and the handset to the stand. Positive and negative connection terminals provided on the handset when placed on-hook and positive and negative connection terminals provided on the stand The speaker amplifier and the speaker are connected to each other by contacting each other, and the positive and negative connection terminals provided on the handset and the positive and negative connection terminals provided on the stand are not in contact with each other when the handset is lifted off the hook and off-hook. A handset characterized in that the speaker amplifier and the speaker are connected with a curl cord. 2. The connection terminal provided on the handset and the connection terminal provided on the stand are formed such that one of them has a rectangular plate shape and the other has a flat spring shape. The listed phone. 3. A connection terminal provided on the handset and a connection terminal provided on the stand, one of which is formed in a flat plate circular shape and the other is formed as a conical projection. The listed phone. 4. The connection terminal provided on the handset and the connection terminal provided on the stand are formed such that one of them is formed into a rectangular plate shape and the other is formed into a pin-shaped projection. The listed phone. 5. A projection is formed on one of the handset and the stand, and a recess is formed on the other of the handset and the stand so as to engage with the projection when on-hook, and a connection provided on the handset. 2. The telephone according to claim 1, wherein one of the terminal and the connection terminal provided on the mounting table is provided at the tip of the convex portion, and the other is provided at the bottom surface of the concave portion.