摘要:
Head-up display (100) projects an image on windshield (220) to allow an observer to visually recognize a virtual image. Head-up display (100) includes display device (110) and projection optical system (120). Projection optical system (120) includes refractive optical system (121) and concave mirror (122). Display device (110) displays an image to be displayed. Projection optical system (120) projects the image to be displayed on display device (110) to a visual point of the observer. Refractive optical system (121) includes at least one optical element. Concave mirror (122) has a concave reflection surface. Refractive optical system (121) is positioned between display device (110) and concave mirror (122) on an optical path. A surface of the optical element to which light of the image to be displayed on display device (110) is first incident is a concave surface.
摘要:
An optical pickup device capable of improving playback performance in L2-layer at a time of playback of a triple-layer structure optical disc is provided. The optical pickup device includes a semiconductor laser that emits a laser beam, and an object lens that concentrates the laser beam emitted from the semiconductor laser on the optical disc. In this optical pickup device, an optical axis of the object lens is inclined with respect to an optical axis of the laser beam that is incident on the object lens so as to generate flares caused by coma aberration on an entrance side in a forward direction of pits of the optical disc.
摘要:
A wavelength tunable laser includes a distributed feedback (DFB) array with first and second DFB laser diodes that generates first and second beams of light in first and second wavelength ranges. A microelectromechanical (MEMS) optical element selectively couples one of the first and second beams of light from the DFB laser array into an optical waveguide. The MEMS optical element includes a collimating lens and a thermal or electrostatic MEMS actuator for moving the collimating lens to select the one of the first and second beams of light. A focusing lens is located between the collimating lens and the optical waveguide. Alternately, the MEMS opticall element includes a fixed collimating lens that collimates the first and second beams of light, a mirror, and a MEMS actuator for tilting the mirror to select the one of the first and second beams of light.
摘要:
An optical pickup device capable of improving playback performance in L2-layer at a time of playback of a triple-layer structure optical disc is provided. The optical pickup device includes a semiconductor laser that emits a laser beam, and an object lens that concentrates the laser beam emitted from the semiconductor laser on the optical disc. In this optical pickup device, an optical axis of the object lens is inclined with respect to an optical axis of the laser beam that is incident on the object lens so as to generate flares caused by coma aberration on an entrance side in a forward direction of pits of the optical disc.
摘要:
An optical switching fabric (100) with an optical to electrical converter (124) in the output plane (120). The optical switching fabric (100) has an input plane (110) with at least one input. The input plane (110) provides at least a first optical signal (e.g., a first set of optical signals). The optical switching fabric has an output plane (120). The optical switching fabric has an interconnection mechanism (130) for receiving the first set of optical signals and directing each received optical signal to a predetermined location in the output plane. The output plane (120) has at least one optical to electrical converter (124) (e.g., a plurality of optical to electrical converters) for receiving the directed optical signals and responsive thereto for generating a set of corresponding electronic output signals.
摘要:
A wavelength tunable laser includes a distributed feedback (DFB) array with first and second DFB laser diodes that generates first and second beams of light in first and second wavelength ranges. A microelectromechanical (MEMS) optical element selectively couples one of the first and second beams of light from the DFB laser array into an optical waveguide. The MEMS optical element includes a collimating lens and a thermal or electrostatic MEMS actuator for moving the collimating lens to select the one of the first and second beams of light. A focusing lens is located between the collimating lens and the optical waveguide. Alternately, the MEMS opticall element includes a fixed collimating lens that collimates the first and second beams of light, a mirror, and a MEMS actuator for tilting the mirror to select the one of the first and second beams of light.