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US 8,300,514 B2Granted
Optical pickup device
AssigneeFunai Electric Co., Ltd.
InventorNoritaka Tanabe
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AssigneeFunai Electric Co., Ltd.
InventorNoritaka Tanabe
Estimating the term…
In the invention, a movable lens varying the rate of convergence or divergence of light reaching an objective lens by moving in an optical axis direction has its position adjusted to correspond to ambient temperature. The objective lens is arranged to be tilted with respect to an optical axis of light reaching the objective lens from the movable lens. First coma aberration of which the amount produced varies according to movement of the movable lens, and second coma aberration of which the amount produced varies due to variation in the warping state of an optical disc that is caused along with variation in ambient temperature both occur in the radius direction of the optical disc, and the objective lens has its tilting direction adjusted such that the first coma aberration and the second coma aberration have their increasing and decreasing directions of the amount of coma aberration produced with respect to variation in ambient temperature reversed.
An optical pickup device comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Lenses: objective lenses
Lenses: separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
Active, e.g. controlled by electrical or mechanical means: during transducing, e.g. to correct for variation of the spherical aberration due to…
Heads, e.g. forming of the optical beam spot or modulation of the optical beam: apparatus or processes for the manufacture of optical heads, e.g.…
About 2 years 11 months of term left · ends 6 Oct 2029 (estimated)
This application is based on Japanese Patent Application No. 2008-261259 filed on Oct. 8, 2008, the contents of which are hereby incorporated by reference.
1. Field of the Invention
The present invention relates to an optical pickup device that is used when reading information from or writing information to an optical disc. More particularly, the invention relates to a technology suitable for an optical pickup device in which an objective lens that focuses light from a light source on an information recording surface of an optical disc is formed of resin.
FIG. 1 is a plan view schematically showing the structure of an optical pickup device according to an embodiment of the present invention;
FIG. 2 is a schematic view illustrating the structure of an optical system provided in the optical pickup device according to the embodiment;
FIG. 3 is a plan view schematically showing the structure of a collimator-lens positioning mechanism provided in the optical pickup device according to the embodiment;
Hereinafter, a description will be given of an optical pickup device according to an embodiment of the present invention with reference to the accompanying drawings.
First, with reference to FIGS. 1 to 3, 4A and 4B, an outline of the structure of the optical pickup device according to the embodiment will be described. FIG. 1 is a plan view schematically showing the structure of the optical pickup device according to the embodiment. FIG. 2 is a schematic view illustrating the structure of an optical system provided in the optical pickup device according to the embodiment. FIG. 3 is a plan view schematically showing the structure of a collimator-lens positioning mechanism provided in the optical pickup device according to the embodiment. FIG. 4A is a perspective view schematically showing the overall structure of an objective lens actuator provided in the optical pickup device according to the embodiment; FIG. 4B is a perspective view schematically showing the structure of a coil provided in the objective lens actuator according to the embodiment.
As shown in FIG. 1, the optical pickup device 1 according to the embodiment is provided with a slider base 2. The slider base 2 has two axis supporting portions 2a and 2b of different kinds. The slider base 2 is slidably supported, with the axis supporting portions 2a and 2b, on two guide shafts 71 that extend in a radius direction of an optical disc (unillustrated). This makes the optical pickup device 1 movable in the radius direction. The slider base 2 is moved by an unillustrated moving mechanism that is publicly known. Such a publicly known moving mechanism includes a structure in which a rack mounted on the slider base 2 and a pinion rotated by a motor are used.