Relative velocity sensing device

Details Relative velocity sensing device Relative velocity sensing device

1993-03-29

1994-11-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

053650603

ABSTRACT:
A relative velocity sensing device for sensing an optical beam spot, for example, by using a tracking error difference signal that fluctuates as a sine-wave in accordance with a movement of the beam spot. The tracking error difference signal is converted into a first sawtooth wave signal, and a second sawtooth wave signal, having a phase which is offset from the first sawtooth wave signal by one half of the period thereof. A first differential signal is obtained in accordance with the first sawtooth wave signal, and a second differential signal is obtained in accordance with the second sawtooth wave signal. The level of a tracking error sum signal is shifted to obtain a level-shifted signal, so that a polarity signal is obtained. The first differential signal is selected when the polarity signal is positive, and the second differential signal is selected when the polarity signal is negative and, thus, a velocity signal showing the velocity of the beam spot with a high accuracy may be obtained.

REFERENCES:
patent: 3654479 (1972-04-01), Catherin
patent: 4982397 (1991-01-01), Yokota
patent: 5163034 (1992-11-01), Kitai et al.
patent: 5189654 (1993-02-01), Minakuchi

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