G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1150836
ABSTRACT A focus servo system for use in a player apparatus for deriving information from an information bearing surface, the player apparatus including an optical device for directing a source beam of radiation along a prescribed optical path to the surface, the focus servo system comprising: an objective lens for focusing the source beam on the information bearing sur- face; a focus error detector for detecting the position of the objective lens relative to the information bearing surface; a lens driver, selectively responsive to the focus error detector, for moving the objective lens relative to the information bearing surface along the path of the source beam; a focus acquisition signal device, selectively generating an output to the lens driver in a focus acquisition mode, for driving the objective lens in a first direction through a predetermined range of travel that includes an optimum focusing position; and a kick-back signal device, responsive to the focus error de- tector means, for providing an additional ouptut to the lens driver means to intermittently drive the objective lens in a direction opposite to the first direction, whereby the objec- tive lens scans back and forth past the optimum focusing posi- tion; an objective lens focusor for focusing the source beam on the information bearing surface; a focus error detector for detecting the position of the objective lens relative to the information bearing surface; a lens driver, selectively respon- sive to the focus error detector, for moving the objective lens relative to the information bearing surface along the path of the source beam; focus acquisition signal device in a focus acquisition mode, for driving the objective lens in a first direction through a predetermined range of travel that includes an optimum focusing position; and a kick-back signal device, responsive to the focus error detector, for providing an addi- tional output to the lens driver to intermittently drive the objective lens in a direction opposite to the first direction, whereby the objective lens scans back and forth past optimum focusing position.
416310
Ceshkovsky Ludwig
Dakin Wayne R.
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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