Minolta Company, Ltd.

Konica Minolta Opto, Inc.

Konica Minolta, Inc.

Minolta Camera Kabushiki Kaisha

Minolta Camera Co., Ltd.

Minolta C., Ltd.

Junji Hashimura

Tohru Kimura

Takashi Okada

Yuichi Atarashi

Hisayuki Masumoto

Yuichiro Ori

Toshiyuki Kojima

Akira Fukushima

Hiromu Umeda

Nobuyuki Taniguchi

Hideki Nagata

Hisashi Tokumaru

Norihide Yamada

Hideo Kajita

Kazunari Tada

Mitsuru Mimori

Masayuki Ikemura

Nobuya Miki

Hiromu Mukai

Akihiro Nakamura

Kiyono Ikenaka

Hitoshi Hagimori

Minoru Kuwana

Kyu Takada

Yujiro Mima

Shinichiro Saito

Kohei Ota

Soh Ohzawa

Tetsuo Kohno

Kentarou Nakamura

Eiji Nomura

Katsuya Sakamoto

Tetsuro Kanbara

Shinichi Suzuki

Kazuhiro Sugawara

Osamu Tannai

Kenji Hamada

Masaya Kinoshita

Shinichiro Saitou

A head-up display apparatusincludes: a projection optical systemthat projects a virtual image; an environment monitor portionas an object detection part that detects an object present in a detection region and detects a distance from the projection optical systemto the object as a target distance; an arrangement change apparatusas a projection distance change part that periodically changes a projection distance of a virtual image from the projection optical system; and a main control apparatusand a display control portionas an image addition part that adds a related-information image as a virtual image by the projection optical systemto the detected object at timing when the target distance substantially matches the projection distance.

Head-up display apparatus

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

An objective lens system for an optical pickup apparatus, includes in order from an object side: a first lens group having negative paraxial power P(mm); and a second lens group having positive paraxial power P(mm) for converging a light flux emitted from the first lens group on an information recording surface of an optical information recording medium.

Condenser lens for an objective lens system

An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength &#x3bb;1 (430 nm&#x3e;&#x3bb;1&#x3e;380 nm), a second light source for emitting a second light flux having second wavelength &#x3bb;2 (&#x3bb;2&#x3e;&#x3bb;1), an objective optical system having phase structure thereon, and at least one moving optical element for guiding the light flux into the objective optical system, the moving optical element being moved in a direction parallel to an optical axis corresponding to the first light wavelength &#x3bb;1 and the second light wavelength &#x3bb;2, wherein the objective optical system has phase structure and satisfies M1=M2=0, where, M1 and M2 denote a first and second magnifications of the objective optical system for recording and/or reproducing the information on or from the first and second optical information media.

Optical pickup apparatus with objective optical system and guiding optical system

An optical pickup apparatus for information recording and/or reproduction on different optical information recording media with compatibility among these media, the optical surface of a first objective lens and the optical surface of a second objective lens are formed only of a refractive surface. The second objective lens is used in common for the first light flux with a wavelength of &#x3bb;and the second light flux with a wavelength of &#x3bb;but in the case where the protective substrate tof the second optical information recording medium and the protective substrate tof the third optical information recording medium are the same, it is not necessary to take the difference in thickness of the protective substrate into consideration. Chromatic aberration based on the difference in wavelength between the first light flux and the second light flux can be corrected by displacing the second coupling lens.

Optical pickup apparatus

Objective optical system for optical pickup apparatus, optical pickup apparatus, driving apparatus for optical information recording medium, condenser lens and optical path compounding element

The present invention has a beam shaping element for converting the light source 11 into a light flux whose emitting angle is almost equal and for projecting it, and a generation amount of the astigmatism generated by the temperature change is suppressed by a linear expansion of the beam shaping element.

Light source apparatus provided with beam shaping element and optical pick-up apparatus having the same

An objective optical element for use in an optical pickup apparatus first-third light sources emitting first-third light fluxes and a light converging optical system, includes a first optical path difference providing structure for providing an optical path difference which provides a substantial phase change to the third light flux and does not provide a substantial phase change to the first and second light fluxes; and a second optical path difference providing structure for providing an optical path difference to the first light flux, the second light flux and the third light flux, wherein the objective optical element converges the first-third light fluxes through the protective layers with the thicknesses t1-t3 onto an information recording surface of the first-third optical information media respectively.

Objective optical element and optical pickup apparatus

A multi-focal objective lens for use in an optical pickup apparatus for recording and/or reproducing information using a first light flux with a wavelength &#x3bb;on a first and second optical discs, includes a first optical surface including a first diffractive structure. The multi-focal objective lens converges a diffracted light flux with one of the m-th diffraction order and the n-th diffraction order on an information recording surface of the first optical disc for recording and/or reproducing information of the first optical disc, and converges a diffracted light flux with another of the m-th diffraction order and the n-th diffraction order on an information recording surface of the second optical disc for recording and/or reproducing information of the second optical disc.

Multi-focus objective lens, optical pickup apparatus and optical information recording reproducing apparatus

In a beam shaping device for converting the laser light emitted from a semiconductor laser light source from an elliptic beam to a circular beam, the light-entrance-side and light-exit-side surfaces of the beam shaping device both have a curvature only in the minor-axis direction of the cross section of the elliptic beam. Of the light-entrance-side and light-exit-side surfaces, one is a circular-arc cylindrical surface and the other is a non-circular-arc cylindrical surface. The beam shaping device fulfills prescribed conditions with respect to the center thickness, surface shapes, and/or other features.

Beam shaping device

In a beam shaping device for converting the laser light emitted from a semiconductor laser light source from an elliptic beam to a circular beam, the light-entrance-side and light-exit-side surfaces of the beam shaping device both have a curvature only in the major-axis direction of the cross section of the elliptic beam. Of the light-entrance-side and light-exit-side surfaces, one is a circular-arc cylindrical surface and the other is a non-circular-arc cylindrical surface.

An objective lens system for optical pickups reading and/or writing information by condensing a luminous flux from a light source onto an optical information recording medium, consists of, a single lens having, from a light source side, a first surface convex to the light source side and a second surface convex to an image side. A medium of the single lens is a homogeneous medium. At least one of the two surfaces is aspherical. The system satisfies the predetermined conditions.

Objective lens system for optical pickups

A zoom optical system has a focus adjusting unit that performs focusing for an object by moving along an optical axis thereof and a magnification adjusting unit that corrects a change in optical magnification caused by the focusing by moving along an optical axis thereof.

Zoom optical system with a prescribed conjugate distance

A scanning optical system has an object side lens unit for condensing light from an object, a mirror for performing a main scan to read the image of the object by deflecting the light transmitted through the object side lens and an image side lens unit for forming an image on the image sensing surface using both the extra-axial light and axial light in a subscan direction deflected by the mirror. The scanning optical system satisfies the predetermined condition defined by lenses of Abbe number.

Scanning optical system

An objective lens system for optical pickups performing at least one of reading and writing of information by condensing a luminous flux from a light source on an information recording medium, has the following two lens elements from a light source side: a first lens element having a first surface convex to the light source side and a second surface convex to the light source side; and a second lens element having a third surface convex to the light source side and a plane fourth surface, wherein the first surface is an aspherical surface.

Growing community of inventors

Sakai, Japan

Junji Hashimura