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Abstract

A photoelectric type displacement detecting instrument comprising: a main optical lattice formed on a first member; an auxiliary optical lattice formed on a second member; a light emitter for emitting detecting light to the both optical lattices in a direction from the outer side of the second member to the first member; a light receiver opposed to the light emitter, interposing therebetween the both optical lattices, for receiving the detecting light transmitted through the both optical lattices, transducing changes in the value of the received light through the repeat of overlappings due to relative movements between the both optical lattices into electric signals; and an electronic circuit for calculating a relative moving distance between the main optical lattice and the auxiliary optical lattice on the basis of the electric signals. The auxiliary optical lattice is formed into a plurality of parts by a phase dividing frame; the light receiver is divided into a plurality of parts corresponding in number to the parts of the auxiliary optical lattice. The light emitter is of such an arrangement that the light diffused from a light emitting element is reflected in parallel in the direction of the main optical lattice and the auxiliary optical lattice, and transmitted through a surface, where the optical lattices are formed, perpendicularly.

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First Claim