CN2133993Y

CN2133993Y - Three-purpose intercom

Info

Publication number: CN2133993Y
Application number: CN92220350U
Authority: CN
Inventors: 邱洵
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-25
Filing date: 1992-09-25
Publication date: 1993-05-19
Anticipated expiration: 2002-09-25

Abstract

The utility model relates to a three-purpose intercom, a radio circuit, a transmitting circuit and a lamp head three parts can be organically assembled via an electronic antenna swith, a functional switch and an emit key. Therefore, the functions of lighting, radio receiving and dialoguing can be quickly and accurately accomplished. The radio part adopts an integrated circuit, the transmitting circuit and the radio circuit are separately placed and are overlapped arranged. The utility model has the advantages of compact structure, convenient operation, low cost, stable work and wide applicability, which can be used for short and middle distance wireless communication and can be used as a domestic appliance, and the utility model can also be used for personal communicating, travel, entertainment, etc.

Description

Three-purpose intercom

The utility model belongs to the radio communication technology field, and it has illumination, radio reception, three kinds of functions of intercommunication.

In the prior art, the broadcast receiver of single usefulness and intercom technology are very ripe, are difficult to enter general family owing to professional intercom price is too high.At present, the demand for amateur intercom has appearred, as the usefulness of tourism, amusement, toy for children on the market.Someone proposes, and by the mechanical switch duplexer realization intercommunication function that combines, the intercommunication frequency realizes to certain position by rotary variable capacitor with common broadcast receiver and transmitter.

There is wretched insufficiency in such scheme.At first, when operating frequency is very high, human 110 megahertzes are for example arranged, the parasitic capacitance of mechanical duplexer is the PF magnitude, and its capacitive reactance is hundred Europe magnitudes only, and more powerful transmitting can be scurried into the radio reception input of this alertness sense by parasitic capacitance, burns out integrated package.Secondly, say in short and change switch No. one time, easily cause the duplexer loose contact, the zero load of transmitter power amplifier level will be burnt out.So, use the mechanical switch duplexer significantly to reduce whole aircraft reliability, limit transmitting power and receiving sensitivity, thereby limited communication distance.Moreover, rely on the way of rotary variable capacitor searching intercommunication frequency extremely inconvenient, can not find the frequency conversation rapidly accurately.

The purpose of this utility model is to provide a kind of convenient and reliable receipts, photograph, says Three-purpose intercom.

The utility model utilization electronic antenna switching circuit, functional switch, emission button organically combine radio reception circuit, radiating circuit, lamp holder three parts, realize receiving, shine, say three kinds of functions quickly and accurately.The radio reception circuit comprises general wireless each element circuit, adopts extensive integrated package; Radiating circuit comprises modulating oscillator and casacade multi-amplifier.Of the present utility model being characterised in that, utilization electronic antenna switching circuit makes radio reception circuit and radiating circuit realize reliable contactless conversion, thereby allows transmitting power and receiving sensitivity to improve.Functional switch has two groups of contacts, and a winding is between power supply and lamp holder or emission button, and another winding is between the resonant tank and variable capacitor of radio reception circuit.Functional switch cuts off the line of variable capacitor and resonant tank, makes the radio reception circuit working immediately on fixing intercommunication frequency, and exceeds the radio reception frequency range.The emission button is not have the lock button, and its normally-closed contact is connected between power supply and the radio reception circuit, and its normally opened contact is connected between power supply and the radiating circuit, unclamps the emission button, and power supply turns to the radio reception circuit automatically, helps conversation and economize on electricity like this.Earphone socket is connected between loud speaker and the radio reception circuit output end, inserts earphone, and loud speaker is not worked.

Feature of the present utility model also is, radio reception circuit and radiating circuit are that subregion is arranged, two districts can be installed in separately the printed board, thereby allow the overlapping installation of realization, rationally utilize the space.

Feature of the present utility model is that also lighting switch is served as by the pair of contact of functional switch; Short circuit line segment A from power supply to the emission button can make illumination and intercommunication or radio reception realize simultaneously; If power supply capacity is little, disconnect A, illumination can not realize simultaneously with other function yet.

The utility model compared with prior art has the following advantages:

1. compact conformation, circuit are reasonable, and three kinds of functions are organic to be combined dexterously.

2. the radio reception state transfers the intercommunication state to, rapidly accurately, reliability is high, speech range is far away, the intercommunication frequency is reasonable, thereby guarantees intercommunication function practicability.

3. function is many, is suitable for face width, more can be adapted to tourism, amusement, does toy for children and night, the dark place uses.

4. the utility model is cheap, is beneficial to popularization.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is the electrical schematic diagram of an embodiment of the utility model.

Fig. 3 is the layout plan of an embodiment of the utility model.

The utility model is described in further detail below in conjunction with embodiment:

With reference to Fig. 1～Fig. 3, the utility model is made up of casing 1, antenna 2, radio reception circuit 3, loud speaker 4, radiating circuit 5, microphone 6, power supply 7, electronic antenna switching circuit 8, functional switch 9, emission button 10, lamp holder 11, earphone socket 12 etc.There is integrated package 14, four to connect variable capacitor (wherein two being linked as 15,16), band switch 17, mains switch 18 and other element in the radio reception circuit.Integrated package 14 is cores of radio reception circuit, selects high-performance LSI for use, for example CXA1191M or TDA7021T.The frequency modulation height is put with the resonant tank of local oscillator and is linked to each other with variable capacitor 15,16 through the pair of contact of functional switch 9.

With reference to figure two, when 0,1 contacting of functional switch 9, closing a switch 18 gets final product broadcast listening; When 0,2 contactings of functional switch 9, resonant tank and variable capacitor 15,16 disconnect, if at this moment do not touch emission button 10, radio reception circuit 3 receives the intercommunication signals; If at this moment press emission button 10, radiating circuit 5 energising work, the radio reception down circuitry quits work, and simultaneously, positive bias makes diode D1, D2, D3 conducting, and the input of radio reception circuit 3 is closed by short circuit; Speech is delivered to antenna 2 again and is launched through microphone 6, radiating circuit 5, electronic antenna switching circuit 8.Unclamp emission button 10, radiating circuit 5 outages, diode D1, D2, D3 end, and the radio reception input is open.When 0,3 contactings of function 9 switches, the lamp holder electrified light emitting.

With reference to Fig. 3, the pocket-size a kind of arrangement of Three-purpose intercom is with radiating circuit 5, electronic antenna switching circuit 8 and the 4 overlapping installations of thin slice loud speaker, 3 volts of lithium batteries of power supply 7 usefulness, one joint, and the complete machine size is identical with common pocket radio set.Telescopic antenna 2 is installed in casing 1 outside, and all the other parts are contained in the casing 1.The side-wall hole of casing 1 exposes lamp holder 11, earphone socket 12, charging jack 13; The handle of functional switch 9, emission button 10, band switch 17; The tuning knob of the power supply of radio reception circuit (volume) switch 18 and variable capacitor (containing 15,16) etc.Loud speaker 4, microphone 6 are installed on the porous plate in casing 1 front.

Claims

1, a kind of Three-purpose intercom, include casing (1), antenna (2), radio reception circuit (3), loud speaker (4), radiating circuit (5), microphone (6), power supply (7), it is characterized in that it also includes: electronic antenna switching circuit (8), functional switch (9), emission button (10), lamp holder (11), earphone socket (12); Input, the other end that one end of described electronic antenna switching circuit (8) connects antenna (2), end connection radio reception circuit (3) are connected with the output of radiating circuit (5); Described functional switch (9) has two groups of contacts, and one group of contact is connected between power supply (7) and lamp holder (11) or the emission button (10), and another group contact is connected between the inner resonant tank of radio reception circuit (3) and variable capacitor (15), (16); The normally-closed contact of described emission button (10) is connected between power supply (7) and the radio reception circuit (3), and its normally opened contact is connected between power supply (7) and the radiating circuit (5); Described earphone socket (12) and loud speaker (4) are series at the output of radio reception circuit (3).

2, Three-purpose intercom according to claim 1, its feature are that also radio reception circuit (3) and radiating circuit (5) are that subregion is arranged, thereby allow them to be installed in the different printed boards.

3, Three-purpose intercom according to claim 1 and 2, its feature are that also lamp holder (11) is that pair of contact by functional switch (9) is connected with power supply (7), has a short circuit line segment A from power supply (7) to emission button (10).