Appeal No. 95-4547
Application No. 08/097,697
compact disc and samples of the tracking control signal for at least
the last 360 degrees of tracking are stored in memory. When a
disturbance or defect is detected, the stored tracking signal is
substituted for the real time tracking signal.
Independent claim 1 is reproduced as follows:
1. In a data recovery apparatus having a light beam which
is focused onto a rotating recording medium by a regulation circuit
and is guided along data tracks of the rotating recording medium by a
tracking regulation circuit, where a regulating signal of a
regulation circuit is stored in a memory and the regulating signal
present in the memory is applied to an actuator of the regulation
circuit for the duration of a disturbance, improvements comprising:
means for successively storing regulating signal values, at
predetermined intervals, in memory for at least the last most prior
one rotation of the rotating recording medium;
means for detecting mechanical shock incurred by the
apparatus; and
means for substituting the regulating signal stored in
memory for the regulating signal in response to detecting said
mechanical shock.
The examiner relies on the following references:
Baba et al. (Baba) 4,703,468 Oct. 27, 1987
Ohtake et al. (Ohtake) 4,785,442 Nov. 15, 1988
Anderson et al. 5,241,443 Aug. 31, 1993
(Anderson) (Effective filing date of Apr. 17, 1990)
Claims 1 through 18 stand rejected under 35 U.S.C. § 103 as
unpatentable over Ohtake in view of Anderson and Baba.
2
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