Optical reading system

Details Optical reading system Optical reading system

1996-03-12

1998-01-13

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340571, 34082532, 235382, G08B 1314

Patent

active

057084181

ABSTRACT:
An optical reading system including a warning sound for preventing theft of a portable optical reading apparatus (scanner). A timer is activated when movement of the scanner is detected by a movement detection device mounted on the scanner, indicating that the scanner has been lifted (moved) from a stationary condition. A user determination unit determines whether the movement of the scanner is caused by an authorized user. When the user is an authorized person, a timer is reset. When the timer is not reset during a predetermined time period, a warning sound is generated at a sound level which changes from a low sound level to a loud sound level over a period of time unless a predetermined operation is performed. In one embodiment, a second warning sound is generated at a stationary receiving station when the scanner does not respond to a polling signal.

REFERENCES:
patent: 4528444 (1985-07-01), Hara et al.
patent: 4683462 (1987-07-01), Takeda et al.
patent: 5005111 (1991-04-01), Teal
patent: 5153561 (1992-10-01), Johnson
patent: 5412373 (1995-05-01), Wajda

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