interpolationseinrichtung for digital interpolation of periodic sets.

摘要

1,091,596. Cathode-ray tubes. CARL-ZEISS-STIFTUNG, [trading as CARL ZEISS]. Oct. 29, 1964 [Oct. 30, 1963], No. 44101/64. Heading H1D. [Also in Divisions G1 and G4] The movement of a scale 15 (Fig. 6) is scanned by a transmitter 16 which emits sine-shaped signals phase-displaced by 90 degrees to the deflecting plates 18, 19, 20 of a cathode-ray tube 21 and, as the electron beam scans the screen of the tube, signals are emitted from conducting sections of the screen. In one embodiment the screen comprises equal segments of conducting and non- conducting portions 26, 27, the signals being passed via a photoelectric cell to a pulse generator and counter. In another embodiment (Fig. 8) two superimposed screen discs 35, 36 with partially overlapping screen elements 37, 38, respectively, are constructed so that 50% of the impinging electron beam passes through the element 37, the underlying portion 38SP1/SP allowing the full 50% to pass and a voltage pulse is consequently emitted as the beam moves from A to B. The portion 38SP11/SP not covered by the screen element 37 has a screening capacity of 50% and as the screen element 38 is scanned from C to D a correspondingly phase-deflected voltage impulse is emitted. With this embodiment the direction of movement of the scale may be determined. In a further embodiment (Fig. 9) the appropriate number of an indicating tube 43 is lit when the electron beam strikes one of the elements 40. Similarly one of the numbers of the tube 45 is lit when the electrons impinge on one of the subdivisions 44 of the elements 40. In a further embodiment (Fig. 10) voltages taken from resistances connected to concentrically arranged grid screens 50, 51 in which the screening capacity varies according to the angle of the beam, and applied to the deflecting plates of a second cathode-ray tube so that the electron beam of the second tube moves ten times more quickly across a screen arrangement as shown in Fig. 9, the elements 40 then representing SP1/SP/ 100 units and the elements 44 SP1/SP/ 1000 units. The SP1/SP/ 10 units may be received from a further screen.