Optical pickup apparatus with light source unit including first light source and common light receiving section
AssigneeSankyo Seiki Mfg. Co., Ltd.
InventorTadashi Takeda
Life of this patent
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Abstract
An optical pickup apparatus has a light source unit that includes a first light source and a common light-receiving device having first and second light-receiving sections. The optical pickup apparatus further includes an optical path composition element that guides first light emitted from the first light source and second light emitted from another light source into an optical path that passes an objective lens, and an optical path polarization element that guides reflected lights of the first and the second lights to the common light-receiving device. The optical path polarization element is mounted in the light source unit for guiding reflected lights of the first and second lights to the common light-receiving device.
Claims22
An optical pickup apparatus including a first light source that emits a first light, a second light source that emits a second light having a wavelength different from a wavelength of the first light, an objective lens that converges the first light and the second light on a recording medium, first and second light-receiving sections that receive the first and second light reflected from the recording medium and passed through the objective lens, the optical pickup apparatus comprising:
- a light source unit that includes the first light source and a common light-receiving device that includes the first and second light-receiving sections;
- a second light source that is not included in the light source unit;
- an optical path composition element that guides the first light and the second light into an optical path that passes the objective lens;
- and
- an optical path polarization element that guides the reflected lights of the first and the second lights to the common light-receiving device in the light source unit, wherein the optical path polarization element is a diffraction type optical element that is mounted on the light source unit to form an integral part of the light source unit, and is rotatably adjustable about an optical axis of the first light emitted;
- wherein the first and second light-receiving sections are formed on a semiconductor substrate and include a first group and a second group of light-receiving elements that respectively receive the reflected lights of the first light and the second light.
An optical pickup including a first light source that emits a first light, a second light source that emits a second light having a wavelength different from a wavelength of the first light, an objective lens that converges the first light and the second light on a recording medium, first and second light-receiving sections that receive the first and second light reflected from the recording medium and passed through the objective lens, the optical pickup apparatus comprising:
- a light source unit that includes the first light source and a common light-receiving device that includes the first and second light-receiving sections;
- a second light source that is not included in the light source unit;
- an optical path composition element that guides the first light and the second light into an optical path that passes the objective lens;
- and
- an optical path polarization element, wherein the optical path polarization element is formed with a grating pattern for generating a focusing error signal that guides the reflected lights of the first and the second lights to the common light-receiving device in the light source unit;
- wherein the first and second light-receiving sections are formed on a semiconductor substrate and include a first group and a second group of light-receiving elements that respectively receive the reflected lights of the first light and the second light.
An optical pickup apparatus comprising:
- an apparatus frame;
- a light source unit mounted on the apparatus frame, the light source unit having a first light source that emits first light of a first wavelength and a common light-receiving device including first and second light-receiving sections;
- a second light source that is not included in the light source unit;
- a diffraction type optical element, mounted on the light source unit to form an integral part of the light source unit, that guides at least reflected light of the first light to the common light-receiving device in the light source unit, wherein the diffraction type optical element is rotatable for adjustment about an optical axis of the first light emitted from the first light source;
- and
- an optical system that defines an optical axis, the optical system being mounted on the apparatus frame for guiding at least the first light;
- wherein the common light-receiving device receives reflected light from the first and second light sources, and wherein the first and second light-receiving sections are formed on a semiconductor substrate and include first group and second group of light-receiving elements that receive reflected lights of the first light and the second light, respectively.
A method for manufacturing an optical pickup apparatus for recording and/or reading data on an optical storage medium, the method comprising the steps of:
- providing an apparatus frame;
- forming a light source unit to be mounted on the apparatus frame;
- mounting on the light source unit a first light source that emits first light of a first wavelength and a common light-receiving device including first and second light-receiving sections that receives at least reflected light from the first light source;
- mounting the light source unit on the apparatus frame;
- forming a second light source that emits second light of a second wavelength different from the first wavelength, wherein the second light source is not a part of the light source unit;
- mounting the second light source on the apparatus frame so that the common light-receiving device receives reflected light from the second light source;
- mounting an optical path polarization element on the light source unit to form an integral part of the light source unit, in a manner rotatable for adjustment about an optical axis of the first light emitted from the first light source, wherein the optical path polarization element guides at least reflected light from the first light source to the common light-receiving device in the light source unit;
- and
- mounting on the apparatus frame an optical system that defines an optical axis for guiding at least the first light.
Dependencies are inferred from the claim text.