Appeal No. 2005-2750
Application 09/460,221
on the one hand, and the two converging grating couplers (65, 71), on the other. In this
embodiment, the output of the tracking control circuit 11 is applied to the actuator of the
optical head.
Eighth embodiment – Figs. 15-17
The eighth embodiment differs from the seventh by applying the output of
tracking control circuit 100 as an input to the SAW generating circuits 86 and 87,
thereby permitting the selected converging grating coupler to provide tracking control.
D. The claims of Application 07/740,629
As filed, Application 07/740,629, which matured into the original patent,
contained claims 1-30. As filed, claim 1, the sole independent claim, read as follows:
1. An optical disc apparatus for recording, reproducing, or erasing
an information signal by converging a light flux onto/from a recording layer
through a transparent disc substrate, comprising:
N converging means whose aberrations have respectively been
corrected for said N (N ≥ 2) disc substrates having different thicknesses;
disc discriminating means for discriminating the thickness of the disc substrate of
a loaded optical disc and for generating a discrimination signal corresponding to the
result of the discrimination; and
control means for selecting the converging means in which the
occurrence of the aberration due to the disc substrate is smallest in
accordance with the discrimination signal.
Claims 2, 4, 5, and 7-9, which depended directly on claim 1, appear to
correspond to the first through third and fifth through eighth embodiments as follows:
Claims Embodiments
2 First (Figs. 1-4B)
7
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