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AssigneeCanon Kabushiki Kaisha
InventorsKoh Ishizuka, Tetsuharu Nishimura, Masaaki Tsukiji, Chikara Satoh, Satoshi Ishii
Estimating the term…
A method of and apparatus for optically detecting the position or amount of movement of a movable object, in which a plurality of position data element arrays are provided on a scale attached to the object such that the arrays are arranged in the direction of movement of the object. A string of light beam such as a laser beam, which extends in the same direction as the position data element array, is made to illuminate one of the arrays, and the light reflected by or transmitted through the position data element array is received by a sensor array such as CCD sensor which produces a signal representing the pattern of arrangement of the data elements in the illuminated position data element array and indicating absolute position of the object, whereby the instant absolute position of the object is detected.
A displacement measuring device, comprising:
An encoder for reading out a plurality of codes on a scale, each code being formed by a plurality of bit patterns ranging from a least significant bit to a most significant bit and disposed in a predetermined direction on the scale and arranged such that a least significant bit is not adjacent to a second least significant bit, said encoder further comprising:
A method for reading out a plurality of codes formed on a scale along a moving direction of the scale, each of said codes comprising a plurality of bit patterns ranging from a least significant bit to a most significant bit and arranged in a predetermined direction, said method comprising the steps of:
Dependencies are inferred from the claim text.