Registers – Coded record sensors – Particular sensor structure
Patent
1993-06-25
1994-01-18
Shepperd, John
Registers
Coded record sensors
Particular sensor structure
235455, 250561, 250566, 250236, G06K 710
Patent
active
052801624
ABSTRACT:
In a bar code laser scanning system operable in a continuous scan mode and a sleep mode, an object sensing circuit for automatically switching said laser scanning system from the sleep mode to the scan mode is provided to help extend the operational lifetimes of the system components such as the laser diode and the scanning motors. When in the sleep mode, pulsed light is received and processed to generate a steady state voltage signal. Derived from the steady state voltage signal is a positive threshold voltage signal and a negative threshold voltage signal each having a magnitude respectively greater than and less than that of the steady state voltage level. The steady state, positive threshold and negative threshold voltage signals are input to a comparator means which detects when an object is placed in the scanning field of the laser scanning system. Object detection occurs when the steady state voltage increases above the positive threshold voltage signal or decreases below the negative threshold voltage signal depending upon the object's reflectivity. When an object is detected, a trigger signal is provided to direct the laser system to switch back into the scan mode without interrupting the normal scanning process.
REFERENCES:
patent: 3925639 (1975-12-01), Hester
patent: 4101072 (1978-07-01), Weaver et al.
patent: 4240064 (1980-12-01), Dev Choudhury
patent: 4356389 (1982-10-01), Quirey et al.
patent: 4369361 (1983-01-01), Swartz et al.
patent: 4387297 (1983-06-01), Swartz et al.
patent: 4496831 (1985-01-01), Swartz et al.
patent: 4521678 (1985-06-01), Winter
patent: 4575625 (1986-03-01), Knowles
patent: 4593186 (1986-06-01), Swartz et al.
patent: 4639606 (1987-01-01), Boles et al.
patent: 4694182 (1987-09-01), Howard
patent: 4766297 (1988-08-01), McMillan
patent: 5019698 (1991-05-01), Eastman
patent: 5059777 (1991-10-01), Wittensoldner et al.
patent: 5237161 (1993-08-01), Grodevant
Shepperd John
Symbol Technologies Inc.
LandOfFree
Object sensing system for bar code laser scanners does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Object sensing system for bar code laser scanners, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Object sensing system for bar code laser scanners will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1137648