KR19990022791U - A subminiature phone - Google Patents

Abstract

The present invention relates to a telephone, and to provide an ultra-compact telephone with an overcurrent protection, a sign gain control, and a mute function. The micro telephone has a ring signal detection circuit that receives a ring signal input from a telephone line and outputs it to a buzzer, and is connected in series between the telephone line and the ring signal detection circuit and improves sensitivity at low voltage and low frequency ring signal input. A condenser, a dial circuit for receiving predetermined data from a numeric button for inputting a telephone number, converting the input data into a dial pulse or a complex frequency, and being connected to the telephone line and the dial circuit to give a voice signal to the handset; And a constant current control circuit for controlling the amount of current supplied to the telephone line to be below an appropriate current.

Description

Mini Phone {A SUBMINIATURE PHONE}

The present invention relates to a compact telephone, and more particularly, to a compact telephone to which overcurrent protection, a sign gain control, and a mute function are added.

In general, a telephone has a handset for transmitting and receiving (hereinafter, referred to as a "handset") connected to the main body by a curl cord, and the lower end of the main body of the telephone body adjusts the volume while moving left and right. Acoustic control lever is installed. In addition, the middle part of the main body of the telephone is provided with a number button of 0 to 9 connected to a printed circuit board for calling the other party and two (*, #) function buttons for selecting a specific service.

However, such a conventional telephone is not only bulky but also requires a separate installation space because the handset is mounted on the telephone body. In addition, there was an inconvenience, such as having to hold the handset at the time of the call, so that other tasks cannot be performed at the same time as the telephone call.

On the other hand, Korean Patent Laid-Open Publication No. 98-33618 (hereinafter referred to as "prior art") includes a telephone circuit component of a conventional telephone mounted on a small double-sided PCB in multiple layers to miniaturize the telephone body, and a phone jack on the telephone body. An ultra-slim phone has been disclosed, which is configured so that the earpiece-type handset is connected / separated to be hooked to the ear.

It is clear that this prior art is useful in comparison with a conventional telephone which is not free to carry and move and does not do other work during the exchange.

However, this prior art is difficult to meet the consumer's taste (hearing) because there is no other means to control the sign language gain, and also there is no mute function to block the sound of the call, so when you talk to someone on the phone for a while The problem heard by the other party through this phone is expected. In addition, since the prior art telephone has no current limiting circuit, there is a disadvantage that there is no special countermeasure for overcurrent prevention.

Accordingly, an object of the present invention for solving the above problems is to provide a compact telephone that can adjust the sign language gain from the outside.

Another object of the present invention is to provide a compact telephone that can prevent the flow of overcurrent by embedding a current limiting circuit inside the telephone.

Still another object of the present invention is to provide a compact telephone having a mute function to block a call.

The present invention according to the first check for achieving the above object is connected in series between a ring signal detection circuit for receiving a ring signal input from a telephone line and outputting it to a buzzer, and the telephone line and the ring signal detection circuit. A condenser that improves sensitivity at low voltage and low frequency ring signal input, a dial circuit which receives predetermined data from a number button for inputting a telephone number and converts the input data into a dial pulse or a complex frequency, and the telephone line; A miniature telephone is formed of a telephone circuit connected to a dial circuit so as to exchange voice signals with the handset, and a constant current control circuit for controlling an amount of current supplied to the telephone line to be below an appropriate current.

More preferably, an ultra-compact telephone having a current limiting circuit for preventing overcurrent flow is implemented.

1 is a schematic view showing the appearance of a compact telephone according to a preferred embodiment of the present invention.

Figure 2 is a cross-sectional view showing the configuration of a substrate having a two-layer arrangement in the compact telephone of the present invention.

3 is a block diagram showing an internal configuration of the micro telephone.

4 is a block diagram showing the configuration of a telephone circuit in FIG.

5 is a block diagram showing an internal configuration of a voice call circuit in FIG.

<Description of the symbols for the main parts of the drawings>

10: small telephone 12: connector

16: Knob 18: Number Buttons

19: specific button 20: handset

22: speaker 24: microphone

30: upper substrate 34: lower substrate

104: constant current control circuit 106: communication circuit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention are described, and it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

First, the ultra-compact telephone of the present invention mounted a small thin film component on the bottom of the board on a small board, and applied the assembly method of the double stack structure to mount the IC, audio jack, and other components of the size of the electrolytic capacitor on the top of the board. It was. And the present invention is to install only the keypad portion for the phone on another board, it is assembled integrally to the case by connecting the cable between the two boards, the telephone line connecting means to the back of the case to connect the handset to the side Apparatus for adjusting the means and the volume of sign language was applied. In addition, these connecting means are separated and connected to enable the handset device to be used in the ear during the call by using both hands while making a call.

1 illustrates the appearance of a compact telephone according to an embodiment of the present invention.

In the figure, the small telephone 10 is provided with a connection terminal 12 for connecting a telephone line, the upper portion of the number button 18 to 0-9 for inputting a phone number and a specific button having a special function ( 19) is installed. At this time, the specific button 19 is a mute button (19a) for blocking the ring tone, redial button (19b) for redialing, hook switch (19c) for on / off of the telephone line, and redial It is composed of a redial button 19d for. On the right side (in FIG. 1) of the small telephone 10, an audio jack 14 to which the phone jack 26 of the talker 20 is coupled is formed, and one side of the audio jack 14 adjusts a sign language volume. A knob 16 is attached. In this case, the handset 20 is configured such that a conventional speaker 22 and a microphone 24 are integrally assembled to be plugged into a user's ear.

FIG. 2 is a diagram showing the internal component arrangement structure of the ultra-compact telephone 10 shown in FIG. 1, preferably the durability configuration of the ultra-compact telephone in which various components are arranged in a two-layer structure in order to miniaturize the telephone body. .

As shown in FIG. 2, the small telephone 10 is composed of two substrates, namely, an upper substrate 30 and a lower substrate 34, which form a laminated structure maintaining a predetermined interval. The lower surface of the lower substrate 34 is equipped with chip resistors 36 designed in the form of a small thin film, the upper surface of the remaining large components, preferably the connection terminal 12, the audio jack 38, the capacitor The city 40, the crystal 42, the capacitor 46, and the IC components 44 are assembled while maintaining a constant interval. And the rubber 28 is mounted on the upper surface of the upper substrate 30, the number button 18 and the specific button 19 is mounted. Here, the upper substrate 30 and the lower substrate 34 are integrally assembled by the cable 48. In other words, the upper and lower substrates 30 and 34 are not connected to each other by multiple connectors, but simply connected to each other by one cable 48.

3 is a view showing the internal configuration of a compact telephone according to a preferred embodiment of the present invention, and constitutes a connection terminal 12 which is a connection means of a telephone line, and constitutes various telephone circuits. In the figure, the ring signal detecting circuit 114 receives the ring signal input to the telephone line and makes the ringing sound through the buzzer. The buzzer 116 is a magnetic field type small buzzer which receives a ring signal sound from the ring signal detection circuit 1114 and outputs it to the outside. In addition, a current circuit is built in the ring signal detection circuit 114, and the buzzer sounds using the size of the ring signal.

The capacitor 102 is connected in series between the telephone line and the ring signal detection circuit 114 to improve ring sensitivity when a low voltage and low frequency ring signal is input from the telephone line. That is, the condenser 102 improves the ring sensitivity so that the buzzer sounds even when the ring signal has an extremely small size of 25 VRMS or less, and has a capacity value of 0.4 to 0.8 μF / 250 VDC.

The dial circuit 112 receives data from the number button 18 of FIG. 1 and sends a dial pulse or a complex frequency corresponding to the pressed number button 18 to a telephone line, and the constant current control circuit 104 transmits the phone. The amount of current supplied to the line is controlled below the set current. The call circuit 106 is a circuit connected to the dial circuit 112 so as to exchange voice signals with the handset 20.

Here, the constant current control circuit 104 is a circuit that limits the current so that the micro telephone 10 of the present invention does not excessively consume more than a proper current when the DC voltage and the current supplied to the telephone line are limited. This control circuit 104 will be readily understood by FIG. 4 described later.

As shown in FIG. 4, the bridge rectifier circuit 118 and the conventional loop circuit 126 are configured to allow current to flow regardless of the positive and negative terminals of the telephone line. A current limiting circuit 120 for preventing the flow of overcurrent is connected between the 118 and the loop circuit 126. At this time, the current limiting circuit 120 has a current limiting resistance value of 10 ~ 10Ω. That is, the current limiting circuit 120 has a low line resistance when the DC current supplied to the telephone line depends on the line length and state, for example, when the line length is short, so that overcurrent flows. Therefore, it is a circuit to prevent the overcurrent flow by changing the current consumption. In other words, when the direct current voltage passing through the bridge rectifier circuit 118 is directly applied to the loop circuit 126, an overcurrent flows. In this case, the current limiting circuit 120 restricts the overcurrent to the consumed current so that the loop circuit ( 126). The capacitor 122 is connected to the current limiting circuit 120 to form a currency path, and a resistor 134 is provided to adjust the DC current limiting value.

On the other hand, the detailed configuration and call process of the above-described voice call circuit 106 is as shown in FIG.

Referring to FIG. 5, the call circuit 106 listens to a voice signal coming from a telephone line to the speaker 22 of the handset 20, or transmits a voice from the microphone 24 to the telephone line. . That is, the voice signal coming from the telephone line is input to the mute circuit 132 through the hydration amplifier 130, and the voice signal passing through the mute circuit 132 is received through the handset gain amplifier 136. 20 is output to the speaker 22. At this time, the hydration gain amplifier 136 is connected to a hydration adjustment resistor 134 for controlling the amount of hydration amplification. That is, the hydration adjustment resistor 134 has a variable resistance value within a range of 50 to 250 mV according to the operation of the knob 16 shown in Fig. 1, whereby the hydration side gain is controlled. Therefore, the sign language can be freely adjusted manually according to the hearing condition of the consumer.

Next, the voice signal of the voice input from the microphone 24 of the handset 20 is first amplified through the voice amplifier 138 and then passed through the mute circuit 132, and then again through the voice gain amplifier 146. It is sent out by telephone line. At this time, the song gain amplifier 146 is connected to a song adjustment resistor 144 capable of automatically controlling the amplification degree, the resistance value is in the range of 30 ~ 60Hz.

Here, the mute circuit 132 is a circuit that prevents hydration by blocking the signal sound when performing a call sound blocking function or transmitting a pulse, and the automatic gain controller 142 is configured to control the current variation according to the state of the telephone line. It is a circuit to make the transmit / receive gain automatically compensated. In addition, a mute button 19a is connected to the talk amplifier 138, and the mute button 19a serves to block an arbitrary voice signal input from the microphone 24 of the handset 20 to be transmitted to the telephone line. do. Finally, the network 128 outputs the signal coming through the telephone line to the audio jack 14 or sends the signal coming through the audio jack 14 to the telephone line while feeding back the signal to the speaker of the handset 20 again. It is a telephone line network with a feedback function sent to the side (22).

As described above, the miniature telephone of the present invention adds a mute function to prevent the conversation from being heard by the other party through the telephone even during a short conversation with the next person during a call, and also provides a sign language gain manually. Because it can be controlled by the user has the advantage that can be freely adjusted according to the consumer's taste (hearing state). And since the telephone of the present invention has a built-in current limiting circuit there is an increased effect that can prevent the flow of overcurrent.

Claims (7)

In a compact telephone having a handset 20 in which a speaker 22 and a microphone 24 are incorporated, A ring signal detection circuit 114 for receiving a ring signal input from a telephone line and outputting the ring signal to the buzzer 116; A condenser 102 connected in series between the telephone line and the ring signal detection circuit 114, and for improving sensitivity at the time of inputting ring signals of low voltage and low frequency; A dial circuit 112 for receiving predetermined data from a numeric button 18 for inputting a telephone number and converting the input data into a dial pulse or a complex frequency; A telephone circuit (106) connected to the dial circuit (112) and a telephone line and capable of exchanging voice signals with the handset (20); And a constant current control circuit (104) for controlling the amount of current supplied to the telephone line to be below an appropriate current. The constant current control circuit 104 has a conventional bridge rectifier circuit 118 and a loop circuit 126, and prevents overcurrent flow between the bridge rectifier circuit 118 and the loop circuit 126. Miniature telephone, characterized in that for connecting the current limiting circuit (120). The ultra-compact telephone according to claim 2, wherein the current limiting circuit (120) has a current limiting resistance value of 10 to 10 ?. The communication circuit of claim 1, wherein the call circuit (106) A receiver amplifier 130 and a receiver amplifier 136 for amplifying a voice signal coming from the telephone line, a receiver amplifier 138 for amplifying a voice signal input from the microphone 24 of the handset 20; Has a gain amplifier 146; A mute button (19a) connected to the talk amplifier (138) for blocking a talk sound transmitted from the microphone (24) of the handset (20) to the telephone line; A mute circuit (132) connected to the amplifiers (130, 134, 138, 146), for blocking a signal sound generated when the mute button (19a) is operated or when a pulse is sent; And a gain compensator (142) connected to the receiver amplifier (130) and the receiver amplifier (138), and configured to automatically control a handset gain for current variation according to the state of the telephone line. 5. The communication circuit according to claim 4, wherein the communication circuit (106) includes a sign adjustment resistor (134) for controlling the amount of hydration amplification of the sign gain amplifier (136), and a talk adjustment resistor for controlling the amplification degree of the talk gain amplifier (146). An ultra-compact telephone characterized in that it further comprises (144). The hydration adjustment resistor 134 has a resistance value of 50 to 250 kohms, Miniature telephone, characterized in that a knob (16) is provided on one side of the small telephone (10) for manually adjusting the resistance value from the outside. 6. The compact telephone set according to claim 5, wherein the talk adjusting resistor (144) has a resistance value of 30 to 60 kHz.