Control circuit for control of peripheral equipment of wireless communication appliance

• US 5,495,519 A
• Filed: 03/14/1995
• Issued: 02/27/1996
• Est. Priority Date: 10/04/1993
• Status: Expired due to Term

• Current Assignee: E Lead Electronic Company Limited
• Original Assignee: E Lead Electronic Company Limited
• Inventors: Chen, Stephen
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/403,572
• Time in Patent Office: 350 Days
• Field of Search: 379/58, 379/56, 379/57, 379/59, 379/170, 379/428, 379/429, 379/433, 379/443, 455/33.1, 455/54.1, 455/89, 455/347, 455/351, 455/352, 343/715, 343/703, 343/720, 343/702, 340/825.44, 320/22
• US Class Current: 455/420
• CPC Class Codes: H04M 1/6041 Portable telephones adapted for handsfree use
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A control circuit is adapted for use in a wireless communication appliance, and particularly for an action phone. This circuit is equipped with an antenna which can receive magnetic waves sent off from the appliance or phone so as to generate a current which is further processed by a wave detector so as to obtain a very weak voltage. Such voltage is amplified into a large one, used to control the peripheral equipment operationally connected to the appliance or phone, such as a switch of a speaker of a handfree phone retainer, an alarm device or an automatic phone recorder, facilitating the operation of a wireless communication appliance or an action phone.

Claims

1. A control circuit for use in switching of peripheral equipment in association with a wireless communication appliance, the control circuit being able to distinguish the appliance being in use or in a stand-by mode, said circuit being characterized in that an antenna means is used to pick up electromagnetic waves sent off from said wireless communication appliance, said antenna having a greatest dimension substantially shorter than a quarter wavelength of said waves;

said antenna being connected to one end of an un-tuned wave detecting means which is grounded at the other end, said detecting means detecting said electromagnetic waves;

a control voltage being generated in said control circuit in correspondence to presence of said detected electromagnetic waves and said voltage being amplified by a voltage amplifier wherein said peripheral equipment is controlled by switching said peripheral equipment according to said voltage.

2. The control circuit as claimed in claim 1 wherein said wave detecting means is a diode.

3. The control circuit as claimed in claim 1 wherein said antenna mounted onto said control circuit is a metallic rod.

4. The control circuit as claimed in claim 1 wherein said antenna is a coil.

5. The control circuit as claimed in claim 1 wherein said antenna is the copper coating on a circuit board.

6. The control circuit as claimed in claim 1 wherein said antenna is a connecting pin of a component.

7. A switching circuit for activating a telephone peripheral apparatus with transmissions from a cellular telephone, the circuit comprising:

an antenna, substantially shorter than a quarter wavelength of the transmissions, having an aerial end and a signal end;

a diode connected between the signal end of the antenna and ground;

a capacitor connected in parallel with the diode;

an amplifier having an output and an input, the input connected to the signal end of the antenna; and

a peripheral apparatus power switch connected to the output, the switch connected to power the peripheral apparatus;

whereby the cellular telephone peripheral apparatus is powered when the transmissions induce voltages in the antenna, the voltages being rectified by the diode, stored in the capacitor, and amplified in the amplifier to produce a substantially DC power signal which is coupled to said switch.

8. The circuit according to claim 7, further comprising a resistor connected in parallel with the diode, said resistor acting to control voltage bleed from the capacitor.