초록 ▼

A position selection system comprising a map of a plurality of selection positions arranged in columns and rows with a normally unenergized light emitter and a respective normally disabled light detector positioned at opposie ends of each of the columns and rows. The light emitters are sequentially

A position selection system comprising a map of a plurality of selection positions arranged in columns and rows with a normally unenergized light emitter and a respective normally disabled light detector positioned at opposie ends of each of the columns and rows. The light emitters are sequentially energized and the respective light detectors are synchronously sequentially enabled to thereby avoid the necessity of collimating light from the light emitters.

대표청구항 ▼

A selection system including a two-dimensional map of a plurality of selection positions arranged in columns and rows comprising: a selectively energizable light emitter at one end of each of said columns for emitting light in the direction of the columns; a normally disabled light detector at the o

A selection system including a two-dimensional map of a plurality of selection positions arranged in columns and rows comprising: a selectively energizable light emitter at one end of each of said columns for emitting light in the direction of the columns; a normally disabled light detector at the other end of each of said columns for receiving light from the light emitters of the columns and responsive thereto to produce an output signal; means for successively energizing the light emitters of said columns, means for successively enabling the light detectors of said columns in synchronism with the energization of the light emitters thereof whereby the light detector of a column is enabled only in coincidence with the energization of the light emitter of the column; and column detection means for indicating the absence of an output signal from an enabled light detector of said columns.