Photoelectric proximity sensor having shutter adjustment means f

Details Photoelectric proximity sensor having shutter adjustment means f Photoelectric proximity sensor having shutter adjustment means f

1990-12-14

1992-08-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 340556, G01V 904

Patent

active

051381508

ABSTRACT:
A shutter is manually rotated across a circular aperture and into a light beam projecting through said aperture to selectively block a predetermined proportion of the light beam, thereby reducing intensity of light emitted to shorten the target sensing region distance for a photoelectric proximity sensor. First and second edges of the shutter intersect at a corner common to both edges and greater than ninety degrees. The shutter pivot is located so the corner traverses the aperture and thus the light beam substantially diametrically to cause the first edge to progressively reduce the light beam, the second edge sequentially progressively reducing the remaining half-circle of light beam upon continued rotation of the shutter.

REFERENCES:
patent: 178391 (1976-06-01), Wale
patent: 3447862 (1969-06-01), Elpern
patent: 3715149 (1973-02-01), Freeland
patent: 3843267 (1974-10-01), Vital et al.
patent: 4282430 (1981-08-01), Hatten et al.
patent: 4306147 (1981-12-01), Fukuyama et al.
patent: 4778254 (1988-10-01), Gilliland, III et al.

Affiliated with

Also associated with

Rating

Photoelectric proximity sensor having shutter adjustment means f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photoelectric proximity sensor having shutter adjustment means f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric proximity sensor having shutter adjustment means f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-348271