Optical distance measuring device and printing apparatus...

Details Optical distance measuring device and printing apparatus... Optical distance measuring device and printing apparatus...

2006-04-18

2006-04-18

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559270, C356S630000

Reexamination Certificate

active

07030402

ABSTRACT:
An optical distance measuring device has an objective lens that condenses light from a light emission element to irradiate a measuring object and to form on the measuring object a light spot having a diameter not smaller than 10 μm and not larger than 30 μm. A light receiving lens condenses light reflected from the light spot on the measuring object to make the light incident on a photodetector through a pinhole having a diameter not smaller than 10 μm and not larger than 50 μm. With movement of the measuring object, detection signal of which an amplitude and an output level change according to a distance to the measuring object is obtained from the photodetector.

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