Importance

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Abstract

An X-Y signal generator comprising a guide block having parallel cylindrical guide surfaces at opposite edges of the block, and a sleeve closely fitting about the block and riding on those surfaces. A planar window area is arranged close to the sleeve along a flat face of the block, with an identifiable actuating part of the sleeve appearing within the window. Finger pressure on the actuating part permits finger movement and direction parallel to the cylindrical surfaces to slide the sleeve in that direction, and finger movement in the orthogonal direction rotates the sleeve about the cylindrical surfaces. Movement of a surface of the sleeve, preferably at the opposite side of the block from the window, is sensed to provide electrical signals corresponding to the direction and distance of movement. Preferably, light gratings aligned in each of the two directions are formed directly on the sleeve.

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First Claim