Pulse generator

Details Pulse generator Pulse generator

2007-05-08

2007-05-08

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C341S013000

Reexamination Certificate

active

10976339

ABSTRACT:
A pulse generator which can be used for a printer, for example an ink jet printer, to provide adjustable pulses per unit displacement or speed has a linearly or rotatably displaceable first plate with a periodic pattern of different optical density or transmissivity or reflectivity juxtaposed with a second plate with another array of markings of different optical density transmissivity or reflectivity so that in an overlapping region a Moiré pattern or other interference pattern for beat pattern is provided. The latter is detected by an optical sensor which outputs electrical pulses. The two plates can be relatively displaced to change the pattern and hence the detected periodicity.

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