END OF MESSAGE UNIT FOR USE IN PUSH TO TALK MICROPHONES

• US 3,864,746 A
• Filed: 08/13/1973
• Issued: 02/04/1975
• Est. Priority Date: 08/13/1973
• Status: Expired due to Term

• Current Assignee: Edward S. Burgess
• Original Assignee: Edward S. Burgess
• Inventors: Burgess, Edward S.
• Primary Examiner(s): Eddleman, Alfred H.
• Application Number:
  US05/388,079
• Time in Patent Office: 540 Days
• Field of Search: 179/1.2S,1.2B,1.1DR,1.2R,1.1PS,1.1R 360/71,74,27,13,12,86,97,72
• US Class Current: 360/4
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04M 1/54 Arrangements wherein a dial or the like generates identifying signals, e.g. in party-line systems
• CPC Class Codes: H04R 1/06 Arranging circuit leads; Relieving strain on circuit leads

Abstract

An end of message unit is described for use in '"'"''"'"''"'"''"'"'push to talk'"'"''"'"''"'"''"'"' microphones. The unit is automatically cocked upon actuation of the microphone and an end of message signal is automatically provided when the microphone is deactivated. The end of message signal is stored on the periphery of a magnetic diaphragm which is employed both as the diaphragm of a microphone and as a disc in a disc recorder. A spring acts in conjunction with a viscous bearing to provide the drive and speed control for the disc during end of message signal generation.

Claims

1. A signal producing device for use in microphones including:

a housing;

a recording member for storing information thereon on a predetermined portion thereof;

first means for mounting said recording member for movement relative to said housing;

said movement of said member relative to said housing defining a path of travel for said predetermined portion of said member;

second means for applying a force to said recording member to produce said relative movement for a predetermined period of time;

third means for providing a predetermined coefficient of friction between said recording member and said housing thereby regulating the rate of said relative movement during said predetermined period of time;

fourth means mounted on said housing adjacent to said path for sensing said stored information during said relative movement, so that a signal is thereby produced for said predetermined period of time after said force is applied to said recording member by said second means.

2. The signal producing device as defined in claim 1, in which said recording member is a disc of recording material and said first means includes:

an axle;

fifth means for mounting said disc on said axle and sixth means for mounting said axle for rotation relative to said housing.

3. The signal producing device as defined in claim 2 in which said third means includes a viscous bearing, mounted to resist relative rotation between said axle and said housing and therefore between said housing and said disc.

4. The signal producing device as defined in claim 3 in which said second means includes:

an actuation member mounted for movemeNt between a first position and a second position with respect to said housing;

seventh means for connecting said actuation member to said axle to rotate said axle in response to relative movement between said actuation member and said housing; and

a yieldable member connected between said housing and said actuation member for urging said actuation member towards said first postition;

5. The signal producing device as defined in claim 4, also including:

a first electrical contact mounted on said housing;

a second electrical contact mounted on said housing; and

conducting means on said actuation member to make and trade electrical continuity in response to the position of said actuation member.

6. The signal producing device as defined in claim 5 in which said housing has a plurality of holes therethrough and through which said disc may be sound actuated from external sources.

7. The signal producing device as defined in claim 6 in which said fourth means extends from the periphery of said disc towards the center of rotation thereof and the space between said fourth means and said disc increases from said periphery towards said center of rotation.

8. A signal producing device including:

a housing;

a disc of magnetic material;

means for mounting said disc of magnetic material for rotation in response to a force applied in a first manner and to vibrate in response to sound waves impinging thereon; and

a magnetic pick-up device mounted on said housing adjacent to said disc to provide a signal representation of magnetic information stored on said disc in response to rotation thereof and to the vibrations of said disc in response to sound wave impingement thereon thereby serving the dual function of both a magnetic recorder and a microphone.

9. The signal producing device as defined in claim 8, in which said magnetic pick-up extends from the periphery of said disc towards the center of rotation thereof and the space between said magnetic pick-up device and said disc increases from said periphery towards said center of rotation.

10. The signal producing device as defined in claim 8, also including;

means for applying a force to said recording member to produce said rotation.

11. The signal produce device as defined in claim 10 also including;

means connected to said disc mounting means for providing a predetermined coefficient of friction between said disc and said housing thereby regulating the rate of said rotation.

12. The signal producing device as defined in claim 11, in which said coefficient of friction producing means includes a viscous bearing which resists said rotation.