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US 4,792,685 AGranted
Photoelectric sensor
OwnerMasami Yamakawainventor
Life of this patent
Estimating the term…
Abstract
A photoelectric sensor comprises a light collecting block having a reflective mirror formed on an inner surface of a light transmitting window and a concave mirror including a light passing portion, whereby the reflective mirror is opposed to the concave mirror. Further, the photoelectric sensor comprises an electronic circuit block having a photoelectric element, a plurality of electronic components and a wiring substrate, wherein the photoelectric element is positioned on a light collecting point of the light collecting block.
Claims8
A photoelectric sensor comprising:
- a transparent optical body having a front surface to receive incident light and a rear surface, said front surface having a first region and a second, larger window region to admit light into said transparent optical body, said rear surface having a convex outer region and a central recess region to receive a photoelectric element;
- a concave mirror adjacent to said concave outer region of said rear surface to reflect toward said first region of said front surface light transmitted through said window region of said front surface;
- and
- a second mirror located adjacent to said first region of said front surface to reflect toward said photoelectric element light received from said concave mirror.
1 more element
Dependencies are inferred from the claim text.