Hands free device for a portable phone

• US 5,664,012 A
• Filed: 11/06/1995
• Issued: 09/02/1997
• Est. Priority Date: 11/06/1995
• Status: Expired due to Fees

• Current Assignee: E Lead Electronic Company Limited
• Original Assignee: E Lead Electronic Company Limited
• Inventors: Chen, Stephen
• Primary Examiner(s): Zele, Krista M.
• Assistant Examiner(s): McCarty, Taunya A.
• Application Number:
  US08/553,896
• Time in Patent Office: 666 Days
• Field of Search: 379/420, 379/428, 379/430, 379/433, 379/58, 379/61, 379/74, 379/80, 379/88, 379/90, 379/101, 379/174, 379/426, 455/89, 455/90, 455/128, 455/38.3
• US Class Current: 379/420.04
• CPC Class Codes: H04B 1/385 Transceivers carried on the body, e.g. in helmets
• CPC Class Codes: H04B 2001/3855 carried in a belt or harness
• CPC Class Codes: H04B 2001/3866 carried on the head
• CPC Class Codes: H04M 1/6075 adapted for handsfree use in a vehicle H04M1/6058 takes precedence; arrangements for holding telephones in a vehicle B60R11/0241
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A portable hold-free device is set forth for a hand phone, including an interface board and an external wire set. The interface board is sandwiched between a hand phone and a battery. A hold-free circuit set is contained in the interface board and connected to the external wire set. The external wire set includes an earphone and a microphone. The hold-free device enables the hand phone to be used without being held during driving a car, riding a motorcycle or a bicycle, walking or in other conditions in which the user is inconvenient to hold the hand phone. A speech memory IC is added to the interface board to serve as an answering machine.

Claims

1. A portable hold-free device for a hand phone, comprising an interface board and an external wire set connected thereto, a hold-free circuit set being contained in the interface board, the external wire set including an earphone and a microphone, said interface board being substantially entirely sandwiched between a battery and a hand phone, and said interface board having a front mating face mating to a back mating face of the hand phone and a back mating face mating to a front mating face of the battery.

2. A hold-free device as claim in claim 1, wherein the interface board is disposed with an external wire with a plug which is inserted into a signal transmitting socket of the interface board so as to transmit a peripheral signal.

3. A hold-free device as claimed in claim 1, wherein the hold-free circuit set of the interface board comprises a speaker amplifying circuit, a microphone amplifying circuit and a bold-free triggering circuit.

4. A hold-free device as claimed in claim 1, wherein the hold-free circuit set of the interface board comprises a power-saving circuit which utilizes a difference between a high load of the hand phone when the hand phone is connected to the interface boadr and a low load of the hand phone when the hand phone is disconnected from the interface board to activate the hold-free circuit so as to save power.

5. A hold-free device as claimed in claim 1, wherein the hold-free circuit set of the interface board comprises a speech memory IC serving as an answering machine.