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US 6,983,005 B2Granted
Holographic laser and optical pickup
AssigneeSharp Kabushiki Kaisha
InventorsKatsushige Masui, Kazuhiro Tsuchida
Life of this patent
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Abstract
It is an object of the invention to provide a holographic laser and an optical pickup, with which it is possible to read from and write to a plurality of types of optical disks with different read wavelengths, and to achieve a more compact apparatus. The holographic laser includes for example a package, two semiconductor laser elements and a photodiode for reading out signals accommodated within the package, a holographic element positioned proximate to or in close contact with the top of a glass window, and a wavelength separating element positioned proximate to or in close contact with the top of the holographic element. The holographic laser is integrally formed as a single component.
Claims21
A holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- a wavelength separating element for separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separated by the wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element,
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk and the light beam L2 reflected by the optical disk pass through the second holographic element;
- wherein the light receiving element is positioned between a focal position of 0th order diffracted light of the first holographic element and a focal position of 0th order diffracted light of the second holographic element;
- and
- wherein the first light source, the second light source, the wavelength separating element, the first holographic element, and the second holographic element are integrally formed into a single component.
9 more elements
A holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- a wavelength separating element for separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separated by the wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element,
- wherein the second holographic element, the first holographic element, and the wavelength separating element are arranged in this order in a direction in which the light beam L1 and the light beam F2 are emitted from the first and second light sources toward the respective optical disks,
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element, and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk does not pass through the second holographic element, and the light beam L2 reflected by the optical disk passes through the second holographic element;
- wherein the light receiving element is arranged so as to be located between a couple of the focal positions of the 0th order diffracted light of the first and second holographic elements and a couple of the first and second light sources on a virtual plane perpendicular to an optical axis of the light beam L1 or light beam L2 emitted toward the optical disk from the first or second light source onto which plane the light receiving element is projected, and
- wherein the first light source, the second light source, the wavelength separating element, the first holographic element, and the second holographic element are formed integrally into a single component.
9 more elements
A holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- first and second wavelength separating elements for respectively separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separated by the first wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the second wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element;
- wherein the first holographic element, the first wavelength separating element, the second holographic element, and the second wavelength separating element are arranged in this order in a direction in which the light beam L1 and the light beam L2 are emitted from the first and second light sources toward the respective optical disks;
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element, and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk does not pass through the second holographic element and the light beam L2 reflected by the optical disk passes through the second holographic element;
- wherein the light receiving element is positioned between a focal position of 0th order diffracted light of the first holographic element and a focal position of 0th order diffracted light of the second holographic element;
- and
- wherein the first light source, the second light source, the first wavelength separating element, the second wavelength separating element, the first holographic element, and the second holographic element are formed integrally into a single component.
10 more elements
An optical laser pickup comprising:
- a holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- a wavelength separating element for separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separatcd by the wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element,
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element, and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk and the light beam L2 reflected by the optical disk pass through the second holographic element;
- wherein the light receiving element is positioned between a focal position of 0th order diffracted light of the first holographic element and a focal position of 0th order diffracted light of the second holographic element;
- and
- wherein the first light source, the second light source, the wavelength separating element, the first holographic element, and the second holographic element are integrally formed into a single component;
- and
- an optical system for guiding light emitted from the holographic laser to an optical disk and guiding light reflected from the optical disk to the holographic laser.
12 more elements
An optical laser pickup comprising:
- a holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- a wavelength separating element for separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separated by the wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element,
- wherein the second holographic element, the first holographic element, and the wavelength separating element are arranged in this order in a direction in which the light beam L1 and the light beam L2 are emitted from the first and second light sources toward the respective optical disks,
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element, and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk does not pass through the second holographic element, and the light beam L2 reflected by the optical disk passes through the second holographic element;
- wherein the light receiving element is arranged so as to be located between a couple of the focal positions of the 0th order diffracted light of the first and second holographic elements and a couple of the first and second light sources on a virtual plane perpendicular to an optical axis of the light beam L1 or light beam L2 emitted toward the optical disk from the first or second light source onto which plane the light receiving element is projected, and
- wherein the first light source, the second light source, the wavelength separating element, the first holographic element, and the second holographic element are formed integrally into a single component;
- and
- an optical system for guiding light emitted from the holographic laser to an optical disk and guiding light reflected from the optical disk to the holographic laser.
12 more elements
An optical laser pickup comprising:
- a holographic laser comprising:
- a first light source for emitting a light beam L1 of a first wavelength toward an optical disk;
- a second light source for emitting a light beam L2 of a second wavelength different from the first wavelength toward an optical disk, the second light source being positioned near the first light source;
- first and second wavelength separating elements for respectively separating the light beam L1 and the light beam L2 reflected by the respective optical disks;
- a first holographic element for converging the light beam L1 separated by the first wavelength separating element;
- a second holographic element for converging the light beam L2 separated by the second wavelength separating element;
- and
- a light receiving element for receiving the light beam L1 converged by the first holographic element and the light beam L2 converged by the second holographic element;
- wherein the first holographic element, the first wavelength separating element, the second holographic element, and the second wavelength separating element are arranged in this order in a direction in which the light beam L1 and the light beam L2 are emitted from the first and second light sources toward the respective optical disks;
- wherein the first holographic element is arranged at a position so that the light beam L1 of the first wavelength emitted from the first light source toward the optical disk does not pass through the first holographic element, and the light beam L1 of the first wavelength reflected by the optical disk passes through the first holographic element;
- wherein the second holographic element is arranged at a position so that the light beam L2 of the second wavelength emitted from the second light source toward the optical disk does not pass through the second holographic element, and the light beam L2 reflected by the optical disk passes through the second light holographic element;
- wherein the light receiving element is positioned between a focal position of 0th order diffracted light of the first holographic element and a focal position of 0th order diffracted light of the second holographic element;
- and
- wherein the first light source, the second light source, the first wavelength separating element, the second wavelength separating element, the first holographic element, and the second holographic element are formed integrally into a single component;
- and
- an optical system for guiding light emitted from the holographic laser to an optical disk and guiding light reflected from the optical disk to the holographic laser.
13 more elements
Dependencies are inferred from the claim text.