Infra-red security system

• US 4,751,396 A
• Filed: 01/20/1987
• Issued: 06/14/1988
• Est. Priority Date: 03/10/1986
• Status: Expired due to Fees

• Current Assignee: Electronic Key Incorporated
• Original Assignee: Electronic Key Incorporated
• Inventors: Smitter, Jacob, Daigle, Robert V.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Logan, Sharon D.
• Application Number:
  US07/004,908
• Time in Patent Office: 511 Days
• Field of Search: 307/10 AT, 307/10 R, 307/9, 455/603, 455/606, 455/607, 340/901-904, 340/63, 340/64, 340/68, 340/543, 340/555-557, 340/578, 340/600, 340/693, 340/696, 340/825.3, 340/825.72, 340/349, 250/349, 250/347, 250/214, 250/206, 250/239
• US Class Current: 307/10.3
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G07C 2009/00261 the keyless data carrier having more than one function
• CPC Class Codes: G07C 2009/00785 by light
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: G08B 1/08 using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal

Abstract

An electronic security system which includes an infrared (IR) transmitter operable to broadcast a digital identification code signal at a pre-selectable programmable baud rate. Also included is an IR receiver responsive to the identification code signal received at the programmed baud rate. Further included is a comparator within the receiver to compare the received IR signal and its baud rate with baseline references. The comparator is operably coupled with an ignition circuit when the pre-selected code and baud rate matches the received digital code and baud rate. Both said transmitter and receiver are held within enclosures that are, on their external surfaces, IR transparent and visible light opaque. The internal surfaces of said enclosures are IR reflective.

Claims

1. An electronic security system, comprising:

(a) an infrared (IR) transmitter operable to broadcast a digital identification code signal at a pre-selectable baud rate;

(b) an IR receiver responsive to said identification code signal received at said baud rate;

(c) an enclosure for said receiver, said enclosure being both IR transparent and visible light opaque on its external surface and IR reflective on its internal surface;

(d) comparator means in said receiver to compare received IR digital coded signals, and the baud rates thereof, with digital code and baud rate reference means; and

(e) means operably coupled to said comparator means for enabling an actuation to occur when said reference means match the transmitted IR digital code and baud rate whereby, enhanced reliability and range, and omnidirectionality, is obtained through the use of said enclosure for said receiver/transmitter;

(f) an enclosure for said transmitter, said enclosure being both IR transparant and visible light opaque on its external surface, and IR reflective on its internal surface.

2. The security system as recited in claim 1, in which said enabling means comprises an automobile ignition circuit.

3. The security system as recited in claim 1, further comprising:

means, in said transmitter for generating a pre-selectable IR digital code.

4. The security system as recited in claim 3, further comprising:

means for programming a pre-selectable baud rate for said IR digital code.