Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1981-04-10
1984-01-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 356395, G01D 534
Patent
active
044292198
ABSTRACT:
Apparatus for detecting the position of a movable member such as the control lever (42) of an audio fader (FIG. 2). A series of light emitting and detecting elements (Q1-Q5) define a plurality of light paths arranged over a distance of D units, and provide a first output indicating which of the light paths are blocked. A shutter (24) includes light-obscuring regions (53, 54, 56) alternating with nonlight-obscuring regions where both the light-obscuring and nonlight-obscuring regions are D units in length. The shutter travels through the light paths so as to affect the output of the light detecting elements. The shutter is coupled to the control lever so that the position of the shutter is dependent upon, and therefore indicates, the position of the movable member. Other elements (Q11-Q13 and the solid upper portion of the shutter) provide a second output indicating which ones of the light-obscuring or nonlight-obscuring regions of the shutter are interposed in the light paths, whereby the first and second outputs together indicate the position of the movable member. Other light emitting and detecting elements (Q6- Q10) are provided to extend the range of operation of the apparatus.
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Keller G. James
Yochum Billy G.
Harris Corporation
Nelms David C.
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