Abstract: An object is to provide an image projection system in which a size and weight of a head-mounted portion are reduced and binocular vision is enabled.

Abstract: The present technology aims to provide a diffraction element that functions like a transmissive hologram, and more particularly, aims to provide a diffraction element suitable for forming an image projection system. The present technology provides a composite diffraction element that includes a stack structure including a first diffraction element, a second diffraction element, and a third diffraction element in this order. The second diffraction element diffractively reflects light that has passed through the first diffraction element and reached the second diffraction element, toward the first diffraction element. The first diffraction element diffractively reflects the light diffractively reflected by the second diffraction element, toward the third diffraction element.

Abstract: An object is to provide an image projection system in which a size and weight of a head-mounted portion are reduced and binocular vision is enabled.

Abstract: An optical pickup includes a light source emitting a light beam, a diffraction element diffracting the light beam to separate it into a main beam and a sub beam, an objective lens focusing the main and sub beams onto a desired recording layer of an optical disc, a lens moving section moving the objective lens in focusing and tracking directions, a light-separating element separating a reflected light beam, formed by reflecting each of the main and sub beams at the recording layer, into multiple beam components and allowing the reflected light beam to travel without rotating an image thereof, and a light-receiving element having multiple light-receiving regions that optically receive the reflected light beam and generating a light reception signal based on the amount of received light to allow a signal processing section to generate a focus error signal and a tracking error signal based on the light reception signal.

Abstract: Provided is an optical pickup including: a light-source emitting a light-beam; an objective lens collecting the light-beam on a desired recording layer among one or two recording layers or more installed in an optical disc and where spirally- or concentrically-shaped tracks are formed; a lens-moving unit moving the objective lens in a tracking direction toward at least an inner-circumference or outer-circumference side; a light splitting device splitting a reflected light-beam into reflected light-beams and propagating the light-beams; a light-detecting device generating central, inner-circumference-side, and outer-circumference-side light-detecting signals according to received light amounts thereof by central, inner-circumference-side, and outer-circumference-side light-detecting areas, receiving central, inner-circumference-side, and outer-circumference-side portions of an image of the reflected light-beam in the radial direction and allowing a signal processing unit to generate a tracking error signal by

Abstract: Provided is an optical pickup including: a light-source emitting a light-beam; an objective lens collecting the light-beam on a desired recording layer among one or two recording layers or more installed in an optical disc and where spirally- or concentrically-shaped tracks are formed; a lens-moving unit moving the objective lens in a tracking direction toward at least an inner-circumference or outer-circumference side; a light splitting device splitting a reflected light-beam into reflected light-beams and propagating the light-beams; a light-detecting device generating central, inner-circumference-side, and outer-circumference-side light-detecting signals according to received light amounts thereof by central, inner-circumference-side, and outer-circumference-side light-detecting areas, receiving central, inner-circumference-side, and outer-circumference-side portions of an image of the reflected light-beam in the radial direction and allowing a signal processing unit to generate a tracking error signal by

Abstract: An optical module includes: a base plate; a light emitting element mounted on the base plate; an integrated circuit element of the light receiving element built-in type mounted on the base plate by bonded wires and having a light receiving portion for receiving returning light originating from light emitted from the light emitting element; and a circuit board having a window for allowing light to pass therethrough and connected to the integrated circuit element in a state wherein the light receiving portion is exposed through the window.

Abstract: A method of production of semiconductor light emission devices for forming stripes of two multilayers having different emission wavelengths on a substrate, including the steps of: depositing a first multilayer including an active layer on the substrate; selectively etching the first multilayer to form a plurality of adjoining pairs of stripes of the first multilayer; depositing a second multilayer including an active layer on the substrate and the stripes of the first multilayer; selectively etching the second multilayer to form a plurality of adjoining pairs of stripes of the second multilayer on the substrate between the stripes of the first multilayer; and dividing the substrate between adjoining pairs of stripes of the first multilayer and between adjoining pairs of stripes of the second multilayer to divide it into semiconductor light emission devices provided with a stripe of the first multilayer and the second multilayer having different emission wavelengths.

Abstract: An optical pickup includes a light source emitting a light beam, a diffraction element diffracting the light beam to separate it into a main beam and a sub beam, an objective lens focusing the main and sub beams onto a desired recording layer of an optical disc, a lens moving section moving the objective lens in focusing and tracking directions, a light-separating element separating a reflected light beam, formed by reflecting each of the main and sub beams at the recording layer, into multiple beam components and allowing the reflected light beam to travel without rotating an image thereof, and a light-receiving element having multiple light-receiving regions that optically receive the reflected light beam and generating a light reception signal based on the amount of received light to allow a signal processing section to generate a focus error signal and a tracking error signal based on the light reception signal.

Abstract: An optical module includes: a base plate; a light emitting element mounted on the base plate; an integrated circuit element of the light receiving element built-in type mounted on the base plate by bonded wires and having a light receiving portion for receiving returning light originating from light emitted from the light emitting element; and a circuit board having a window for allowing light to pass therethrough and connected to the integrated circuit element in a state wherein the light receiving portion is exposed through the window.

Abstract: A method of production of semiconductor light emission devices for forming stripes of two multilayers having different emission wavelengths on a substrate, including the steps of: depositing a first multilayer including an active layer on the substrate; selectively etching the first multilayer to form a plurality of adjoining pairs of stripes of the first multilayer; depositing a second multilayer including an active layer on the substrate and the stripes of the first multilayer; selectively etching the second multilayer to form a plurality of adjoining pairs of stripes of the second multilayer on the substrate between the stripes of the first multilayer; and dividing the substrate between adjoining pairs of stripes of the first multilayer and between adjoining pairs of stripes of the second multilayer to divide it into semiconductor light emission devices provided with a stripe of the first multilayer and the second multilayer having different emission wavelengths.

Abstract: A method of production of semiconductor light emission devices for forming stripes of two multilayers having different emission wavelengths on a substrate, including the steps of: depositing a first multilayer including an active layer on the substrate; selectively etching the first multilayer to form a plurality of adjoining pairs of stripes of the first multilayer; depositing a second multilayer including an active layer on the substrate and the stripes of the first multilayer; selectively etching the second multilayer to form a plurality of adjoining pairs of stripes of the second multilayer on the substrate between the stripes of the first multilayer; and dividing the substrate between adjoining pairs of stripes of the first multilayer and between adjoining pairs of stripes of the second multilayer to divide it into semiconductor light emission devices provided with a stripe of the first multilayer and the second multilayer having different emission wavelengths.

Abstract: To improve reliability in controlling an output of a semiconductor laser. There are provided a prism adhered to the semiconductor substrate, and having a light reflection surface formed with a light reflection film for reflecting a laser beam emitted from the semiconductor laser and a light transmission surface for transmitting a laser beam emitted from the semiconductor laser outside an aperture range of the objective lens; a monitor photoreceptor disposed in an area of the semiconductor substrate where the prism is disposed, and receiving the laser beam transmitted through the light transmission surface of the prism; and a signal detection photoreceptor disposed outside the area of the semiconductor substrate where the prism is disposed, for receiving, as return light, a laser beam reflected at the light reflection surface of the prism and converged upon the record surface of the disk-shaped recording medium via the objective lens.

Abstract: A laser module includes a stem provided with a device mounting structure; a light emitting device mounted onto the stem by use of the device mounting structure a tubular cap fixed to the stem in the state of surrounding the light emitting diode and provided with an aperture through which to pass laser light emitted by the light emitting device; and a light transmitting plate fixed, by use of a bonding material, to an inside surface of the cap in the state of closing the aperture. An annular projection projecting to the inside of the cap in the optical axis direction of the laser light is provided at a peripheral edge part of the aperture of the cap, and the light transmitting plate is fixed to the inside surface of the cap inclusive of the projection by use of the bonding material.

Abstract: A laser diode capable of improving surge withstand voltage by preventing damage to a rear end surface, and a method of manufacturing the same are provided. A laser diode includes a laser resonator between a first end surface as a main emission end surface and a second end surface facing the first end surface, and the laser diode includes a light absorption inhibition region on the second end surface side of the laser resonator.

Abstract: A laser capable of improving surge withstand voltage by preventing damage to a read end surface, and a method of manufacturing the same are provided. A laser diode includes a laser resonator between a first end surface as a main emmission end surface and a second end surface facing the first end surface, and the laser diode includes a light absorption inhibition region on the second end surface side of the laser resonator.

Abstract: To improve reliability in controlling an output of a semiconductor laser. There are provided a prism adhered to the semiconductor substrate, and having a light reflection surface formed with a light reflection film for reflecting a laser beam emitted from the semiconductor laser and a light transmission surface for transmitting a laser beam emitted from the semiconductor laser outside an aperture range of the objective lens; a monitor photoreceptor disposed in an area of the semiconductor substrate where the prism is disposed, and receiving the laser beam transmitted through the light transmission surface of the prism; and a signal detection photoreceptor disposed outside the area of the semiconductor substrate where the prism is disposed, for receiving, as return light, a laser beam reflected at the light reflection surface of the prism and converged upon the record surface of the disk-shaped recording medium via the objective lens.

Abstract: A method of production of semiconductor light emission devices for forming stripes of two multilayers having different emission wavelengths on a substrate, including the steps of: depositing a first multilayer including an active layer on the substrate; selectively etching the first multilayer to form a plurality of adjoining pairs of stripes of the first multilayer; depositing a second multilayer including an active layer on the substrate and the stripes of the first multilayer; selectively etching the second multilayer to form a plurality of adjoining pairs of stripes of the second multilayer on the substrate between the stripes of the first multilayer; and dividing the substrate between adjoining pairs of stripes of the first multilayer and between adjoining pairs of stripes of the second multilayer to divide it into semiconductor light emission devices provided with a stripe of the first multilayer and the second multilayer having different emission wavelengths.

Abstract: There is provided a semiconductor laser apparatus capable of individually optimizing oscillations at a plurality of light emitting units fabricated on the single substrate in accordance with usages of each emitted laser lights. A plurality of cavities (laser diodes A and B), which correspond to the plurality of light emitting units, are fabricated on single substrate. And cavity lengths of the cavities are fabricated to different from one another.

Abstract: There is provided a semiconductor laser apparatus capable of individually optimizing oscillations at a plurality of light emitting units fabricated on the single substrate in accordance with usages of each emitted laser lights. A plurality of cavities (laser diodes A and B), which correspond to the plurality of light emitting units, are fabricated on single substrate. And cavity lengths of the cavities are fabricated to different from one another.