Optical focussing read-out device

Details Optical focussing read-out device Optical focussing read-out device

G - Physics

11

B

88/0.11, 352/32.

G11B 7/00 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1071330

ABSTRACT OF THE DISCLOSURE: The present invention relates to an optical read-out device for reading data carrier, comprising an optical reading head capable of displacement parallel to its optical axis at low velocity and with high amplitude, giving rise to displace- ment of the focussing spot, and an optical light-weight element capable of displacement parallel to its optical axis at high velocity and with low amplitude, giving rise to a small displace- ment of the focussing spot. The corresponding displacements are respectively under the control of the low-frequency and high-frequency components of an error signal characteristic of the error interval between the focussing spot and the spot projected on to the data carrier.

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