Photoelectric proximity sensor having shutter adjustment means for sensing region distance

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