G - Physics – 08 – C
Patent
G - Physics
08
C
340/135.1
G08C 21/00 (2006.01) G06F 3/02 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1225717
PHB 32993 ABSTRACT "MANUALLY OPERABLE X-Y SIGNAL GENERATOR" An X-Y signal generator comprises a block 13 on which a close-fitting sleeve 11 is located. The sleeve 11 can move in orthogonal directions x and y along and around the block 13. The movement is effected by finger pressure applied to a finger knob 19 secured to the sleeve 11. The extent of movement in the x, y directions is determined by a window area 18 anywhere within which the knob 19 can be positioned. Light gratings 21 and 22 and associated pairs of light-sensitive diodes 23/24 and 25/26 form two movement sensors for the two orthogonal directions. Limit sensors 30/32 and 29/31 are also provided. See Figures 3 and 4a.
457771
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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