Solid immersion lens, condensing lens, optical pickup device, optical recording and reproducing apparatus and method of forming solid immersion lens
AssigneeSony Corporation
InventorMasataka Shinoda
Life of this patent
Estimating the term…
Abstract
A solid immersion lens 11 has an inclined portion 4 formed on at least a part thereof from the tip end portion of the objective side to a spherical portion and an inclination angle θ is expressed as θ≧i where θi represents the angle of incidence of light incident on the solid immersion lens 11. There are provided a solid immersion lens capable of increasing a tilt margin between a lens and an optical recording medium and so on and which can decrease a diameter of a lens and a method for forming a solid immersion lens.
Claims27
A solid immersion lens comprising:
- an inclined portion formed on at least a part of a tip end portion of the objective side, wherein an inclination angel θ from the optical axis of said inclined portion is expressed as:
- θ≧θi where θi represents an angle of incidence of incident light.
A condensing lens comprising:
- a solid immersion lens;
- and
- an optical lens with its optical axis coincident with that of said solid immersion lens and which is located on the opposite of an objective side, wherein said solid immersion lens has an inclined portion formed on at least a part of a tip end portion of its objective side and an inclination angel θ from the optical axis of said inclined portion is expressed as:
- θ>θi
- where θi represents the angle of incidence of light incident on said solid immersion lens.
An optical pickup device comprising:
- at least a solid immersion lens;
- an optical lens with its optical axis coincident with that of said solid immersion lens and which is located on the opposite side of the objective side;
- a light source;
- and
- a condensing lens composed of said solid immersion lens and said optical lens, said condensing lens converging light emitted from said light source to form a light spot, wherein said solid immersion lens has an inclined portion formed at least on a part of a tip end portion of the objective side and an inclination angel θ from the optical axis of said inclined portion is expressed as:
- θ≧θi
- where θi represents the angle of incidence of light incident on said solid immersion lens.
An optical recording and reproducing apparatus comprising:
- an optical pickup device comprising at least a solid immersion lens, an optical lens with its optical axis coincident with that of said solid immersion lens and which is located on the opposite side of the objective side and a condensing lens composed of said solid immersion lens and said optical lens, said converging lens converging light emitted from said light source to form a light spot;
- and
- control drive means for moving said condensing lens in the focusing direction and/or tracking direction of an optical recording medium, wherein said solid immersion lens has an inclined portion formed at least on a part of its tip end portion of the objective side and an inclination angel θ from the optical axis of said inclined portion is expressed as:
- θ≧θi
- where θi represents the angle of incidence of light incident on said solid immersion lens.
A method for forming a solid immersion lens comprising:
- at least a process for forming an inclined portion on a lens material;
- a process for forming a convex portion on the objective side of said lens material;
- and
- a process for forming an objective surface of said convex portion.
Dependencies are inferred from the claim text.