Ricoh Company, Ltd.

Tetsuya Ogata

Mitsuru Nakajima

Chihiro Tanaka

Kenichi Yoshimura

Kohei Shimizu

Hideaki Hirai

Tatsuo Mikami

Akihiro Iwamatsu

Kenya Yokoi

Masafumi Takahashi

Tsuyoshi Fujimoto

Junichi Kitabayashi

Shinobu Kanatani

Toshiyuki Kawasaki

Shigeru Oohchida

Tokiko Inoue

Shojiro Kawakami

Suguru Douwaki

A display device is for displaying a virtual image in front of a driver of a vehicle. The display device includes a detecting unit that receives light surrounding the vehicle, and detects a brightness of the received light; a restricting unit that restricts an angle of the received light; a correcting unit that adjusts a luminance of a display image, according to the detected brightness of the light; and a displaying unit that superimposes and displays the display image on a field of vision of the driver as the virtual image, based on the adjusted luminance. The restricting unit includes two opening restricting elements arranged on a front side of the detecting unit, such that an angle &#x3b8;at which the detecting unit receives the light is restricted according to an angle &#x3b8;formed by light beams directed from the virtual image toward eyes of the driver.

Display device, vehicle

A heat dissipating component includes a plurality of heat absorbers each provided for a corresponding one of a plurality of electronic components and to absorb heat from the corresponding one of the plurality of electronic components, and a heat dissipator thermally connected to the plurality of heat absorbers and to dissipate the heat absorbed by the plurality of heat absorbers. The heat dissipating component may be incorporated in an electronic device.

Heat dissipating component and electronic device

An imaging device includes a welded part on a lens barrel side that is hardened after a contact portion of a lens barrel or a contact part on the lens barrel side is softened, where the contact portion of the lens barrel and the contact part on the lens barrel side are fixed, and a welded part on a light-receiving circuit side that is hardened after a contact portion of the light-receiving circuit or a contact part on a light-receiving circuit side is softened, where the contact portion of the light-receiving circuit and the contact part on the light-receiving circuit side are fixed.

Imaging device for an in-vehicle camera

An imaging apparatus includes: a lens barrel which holds at least one optical element; an image sensor which converts an image of a photographic subject obtained by the optical element into an electrical signal; a circuit board on which the image sensor is mounted; and a fixing wall body which is a different body from the lens barrel, and where the lens barrel is mounted to an end part of the fixing wall body on a photographic subject side, and the circuit board is mounted to an end part of the fixing wall body on a side opposite to the photographic subject side by a bond structure by an adhesive agent.

Imaging apparatus including a lens barrel holding an optical element

An illumination system includes a light source unit including light emitting elements arranged in array in a main scan direction to project light beams radially, and an optical guide of a long length made from a translucent material to guide incident beams from an exit surface of the light source unit in a certain direction for output, and including at least one surface with a diffuse structure to diffuse a transmitted beam or a reflected beam among the incident beams, wherein the diffuse structure is configured to diffuse the beam at a center at a larger divergence angle than at ends in the main scan direction.

Illumination system, image reader and image forming device

Imaging device

An extraction optical system for use in an optical pick-up device receiving a reflected light from an optical disc having a plurality of recording layers is provided. The extraction optical system extracts from a light in which a signal light component from an access target recording layer of the plurality of recording layers and a stray light component from a recording layer other than the access target recording layer of the plurality of recording layers are mixed, the signal light component from the access target recording layer of the plurality of recording layers. The extraction optical system includes a condensing optical element arranged in an optical path of the light and condensing the light, and a selective optical system to which the light condensed by the condensing optical element is incident and reflecting a light primarily containing the signal light component.

Extraction optical system, optical pick-up device and optical disc apparatus

A multi-layer data storage medium includes a plurality of recording layers in which a guide groove, where data is stored, is formed in a spiral manner, and each center of the plurality of the recording layers is eccentric to a center of the multi-layer data storage medium in a different direction. A method of identifying a recording layer of the multi-layer data storage medium is also described.

Multi-layer data storage medium having eccentric recording layers and recording layer identification method based on eccentricity

An optical system for efficiently extracting plural signal beams from a bundle of rays reflected from a multilayer optical disc.

Optical system, optical pickup apparatus, and optical disc apparatus for extracting signal beams

It is an object of the present invention to provide an optical module which can extract only light components satisfying predetermined conditions, and an imaging device comprising the optical module. The optical module () comprises a first plate-like optical element () formed with a &#xbc; wavelength plate portion () and a &#x2212;&#xbc; wavelength plate portion () alternately jointed together at a joint portion (), and a second plate-like optical element () formed with a &#xbc; wavelength plate portion () and a &#x2212;&#xbc; wavelength plate portion () alternately jointed together at a joint portion (), wherein the first plate-like optical element () and the second plate-like optical element () are parallel, and the &#xbc; wavelength plate portion () of the first plate-like optical element () and the &#x2212;&#xbc; wavelength plate portion () of the second plate-like optical element () are overlapped across a gap ().

Optical module and imaging device

A multi-layered information recording medium used in an information recording/reproducing apparatus applicable to both a single-layer information recording medium and an arbitrary multi-layered information recording medium is provided. The multi-layered information recording medium has a plurality of recording layers, and each of the recording layers has a guiding groove formed at a track pitch defined as a quadratic function of disk thickness (i.e., the distance from the light incident surface) of the associated recording layer. The guiding grooves of the recording layers are formed such that the track pitch of a reference recording layer having a disk thickness closest to that of the single-layer information recording medium is the smallest amongst the multiple recording layers.

Multilayer information recording medium, information recorder, and information reproducer

An optical pickup apparatus for shining light on and detecting reflected light from an optical disk having two recording layers. The apparatus includes a light source, an optical system situated on a path of a light beam returning from the optical disk, the optical system including a light condensing optical unit, a light beam regulating unit, and one or more photo detectors, situated between a position where the light reflected by the first recording layer contained in the partial light beam is condensed and a position where the light reflected by the second recording layer contained in the partial light beam is condensed, the one or more photo detectors having a first photo detecting section to detect the light reflected by the first recording layer and a second photo detecting section to detect the light reflected by the second recording layer.

Apparatus for reproducing signal from multi-layered optical disk using multiple photo detectors

The present invention discloses an optical system for extracting signal light components from a beam including the signal light components and stray light components. The optical system includes a condensing optical element situated on an optical path of the beam for condensing the beam, a polarization changing unit for changing the state of polarization of at least one of the signal light components and the stray light components included in the incident beam transmitted through the condensing optical element, and an extracting element for extracting the signal light components included in the beam transmitted through the polarization changing unit.

Optical system, optical pickup apparatus, and optical disk apparatus

An optical pickup unit for recording information on and/or reproducing information from a multilayer information recording medium including multiple recording surfaces in each of which a guide groove on which the information is to be recorded is spirally formed is disclosed. The optical pickup unit includes a light source, a diffraction element configured to split the light beam emitted from the light source into a main light beam and first and second sub light beams, an objective lens for focusing the main and sub light beams onto a recording surface of the multilayer information recording medium, and multiple light receiving elements each divided into light receiving parts so as to receive the main and sub light beams reflected from the recording surface. The focused first and second sub light beams are disposed at respective positions at least 3/2 tracks away from the focused main light beam on the recording surface.

Optical pickup unit and information recording apparatus using the same

An optical system has an objective lens condensing a light beam from the light source on a recording layer selected from the plurality of recording layers of the optical disk, and leading a returning light beam reflected by the selected recording layer to a predetermined position; an aberration detecting part detecting a physical amount relative to spherical aberration based on an output signal of the photodetector; an aberration correcting part correcting the spherical aberration based on the physical amount; and a processing device carrying out at least the information reproduction o from among information recording, information reproduction and information deletion with the use of the output signal of the photodetector.

Growing community of inventors

Kanagawa, Japan

Tetsuya Ogata