Appeal No. 95-2003 Page 3
Application No. 08/074,265
focused on the information plane, each positioned on a
respective information track to scan such track;
a series of photodetectors for respectively
receiving radiation produced from the respective tracks
by the scanning spots and converting such radiation
into corresponding respective detection signals;
a plurality of error signal generating circuits
respectively coupled to respective ones of said
photodetectors for deriving respective error signals
from the detection signals produced by the respective
photodetectors, each error signal being either (i) a
focus error signal indicative of focus error of the
associated scanning spot with respect to the track
being scanned thereby, or (ii) a tracking error signal
indicative of tracking error of the associated scanning
spot with respect to the track being scanned thereby;
the respective error signals relating to respective
ones of said tracks; and
signal combining means coupled to at least two of
the error signal generating circuits for combining the
error signals produced thereby so as to derive a
control signal for control of at least one of (1) focus
of each of the scanning beams, (2) tracking of each of
the scanning beams, and (3) tilt of the record carrier
relative to the scanning beams.
The examiner relied on the following references in rejecting
the claims:
Russell 4,074,085 14 Feb. 1978
Rees et al. (Rees) 4,998,234 5 Mar. 1991
Hashimoto et al. (Hashimoto) 5,155,718 13 Oct. 1992
Inoue JP 1-1442352 6 June 1989
Specifically, the examiner rejected claims 23 and 25 under
35 U.S.C. § 102(b) as anticipated by Russell. The examiner
rejected remaining claims under 35 U.S.C. § 103 as obvious in
2 We rely on a translation (attached) for our
understanding of this reference.
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