Konica Minolta Opto, Inc.

Konica Minolta, Inc.

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Konica Corporation

Eiji Nomura

Tohru Kimura

Akihiro Nakamura

Kentarou Nakamura

Nobuyoshi Mori

Kohei Ota

Yuichi Atarashi

Kiyono Ikenaka

Kenji Ogiwara

Shinichiro Saito

Junji Hashimura

Norihide Yamada

Toshiyuki Kojima

Kazutoshi Kobayashi

Nobuyasu Tamura

Yutaka Miyasaka

Kimio Nishizawa

Naoya Tanaka

Masaru Kadoi

Shigeharu Ishii

Naoki Taniguchi

Kazuhiro Sugawara

Kazuhisa Akita

Shinya Fujiwara

Kou Hei Umezu

Sho Sugiura

Shinichiro Saitou

An object of the present invention is to provide a virtual image display optical system that is capable of substantially simultaneously displaying virtual images at a plurality of distances even with a simple configuration, and an image display device using the virtual image display optical system. A virtual image display optical system () according to the present invention is provided with: a display element (); a projection optical system () that enlarges an image formed on the display element (); a diffusing screen () that has a diffusing function, and is positioned on the light emission side of the projection optical system (); and a virtual image forming optical system () that converts an image on the diffusing screen () into a virtual image, wherein the virtual image display optical system () is further provided with a positioning changing device () that changes a position of the diffusing screen ().

Virtual image display optical system and image display device

A screen for a head-up display device includes a main body layer sandwiched between a first concave optical surface located at an observation side and a second convex optical surface located at a side opposite to the observation side. A thickness of the main body layer becomes thinner from a center toward a periphery with regard to a lateral direction which is perpendicular to a reference plane, and a variation of the thickness of the main body layer with regard to a vertical direction parallel to the reference plane is different between the central part center and the peripheral part periphery with regard to the lateral direction.

Screen and head-up display device

A battery pack temperature regulating apparatus includes an evaporator configured to cool air inside a battery casing receiving a battery used for driving a vehicle; an evaporator casing receiving the evaporator; and a heater attached to the evaporator casing and configured to heat the air inside the battery casing.

Battery pack temperature regulating apparatus

An air-conditioning system of an electric car has an air-conditioning unit which is configured to perform air-conditioning in a passenger compartment by heater/cooler operation, a setting panel configured to set a target temperature of the passenger compartment, and a control unit which is connected to the air-conditioning unit and setting panel, and has different control of heater operation of the air-conditioning unit, wherein the control unit is configured to select controls of heater operation based on a vehicle speed v.

Air-conditioning system for electric car and method of controlling the air-conditioning system

An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. The optical pickup apparatus provides a wavelength dependency of a spherical aberration so as to correct a change in a spherical aberration due to a refractive index change with a temperature change of the objective optical element.

Optical pickup apparatus, objective optical element and optical information recording reproducing apparatus

The present invention relates to an objective lens, an objective lens unit and an optical pickup apparatus. The objective lens is provided for an optical pickup apparatus recording or reproducing information by converging a light flux with a wavelength &#x3bb;emitted from a light source onto an information recording surface of an optical information recording medium. The objective lens is formed of: a single lens having at least one aspheric surface. In the objective lens, an effective aperture, a thickness on an optical axis, a focal length, a numerical aperture, and a refractive index satisfy the predetermined conditional expressions. The objective lens unit is provided for an optical pickup apparatus and includes an aberration correcting element and the objective lens.

Objective lens for optical pickup apparatus, objective lens unit for optical pickup apparatus and optical pickup apparatus using the same

An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.

Objective lens, optical pickup apparatus and optical information recording and/or reproducing apparatus

A light flux from the first light source forms a converged spot on first optical information recording medium by only a refraction action of the aspheric surface, or by a combination of the refraction action and an optical action given by at least one of the first phase structure and the second phase structure, a light flux from the second light source forms a converged spot on second optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure, and a light flux from the third light source forms a converged spot on third optical recording medium by a combination of a refraction action of the aspheric surface and an optical action given by at least one of the first phase structure and the second phase structure.

Optical pickup apparatus and objective optical element

An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting-a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. The optical pickup apparatus provides a wavelength dependency of a spherical aberration so as to correct a change in a spherical aberration due to a refractive index change with a temperature change of the objective optical element.

A first phase structure corrects at least one of a spherical aberration due to a difference between a protective substrate thickness t1 and a protective substrate thickness t2 and a spherical aberration due to a difference between a first wavelength &#x3bb;1 and a second wavelength &#x3bb;2, and a second phase structure corrects at least one of a spherical aberration generated when the first wavelength &#x3bb;1 is changed in a range of &#xb1;10 nm, a best image point movement generated when the first wavelength &#x3bb;1 is changed in a range of &#xb1;10 nm, and a spherical aberration generated when environmental temperature is changed.

Objective optical element and optical pickup apparatus

An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. In the optical pickup apparatus, the third light flux which has passed through an optical path difference providing structure forms a first best focus and a second best focus.

An optical pickup apparatus according to the present invention includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting a third light flux; and an objective optical element. The objective optical element has an optical surface including at least two areas provided with optical path difference providing structures. The objective optical element converges the first to third light fluxes each passing through the predetermined areas on the objective optical element onto respective information recording surfaces of the first to third optical disks. The first optical path difference providing structure is a ring-shaped structure which includes a plurality of ring-shaped zones including respective steps having at least two kinds of amounts selected from the predetermined expressions.

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Hachioji, Japan

Eiji Nomura