Hitachi Media Electronics Co., Ltd.

Hitachi, Ltd.

Other

Hitachi-lg Data Storage, Inc.

Hitachi Consumer Electronics Co., Ltd.

Katsuhiko Kimura

Hidenao Saito

Jun Hato

Manabu Ochi

Takahiro Yamaguchi

Seiichi Kato

Seiichi Katou

Yoshihiro Sato

Masaru Muranishi

Souichirou Yamada

Ryuichiro Mizuno

Yoshihiro Satou

Hiroshi Ogasawara

Hidehiko Kando

Junichi Senga

Mamoru Kainuma

Tetsuo Itou

Yoshiaki Yamauchi

Shozo Saegusa

Yoshiro Konishi

Masayoshi Watanabe

Kazuyuki Fukuda

Tatsuya Yamasaki

Mitsuo Satake

Kenji Kiya

Kazuhiko Kuzumaki

Satoshi Shinada

Daisuke Tomita

Takayuki Watanabe

Naruo Watanabe

Toshio Sugiyama

Ryoji Okada

Masaya Horino

Tatsuya Ishitobi

Katsuyuki Tanaka

Seiji Ono

Teruhisa Akashi

Hiroyasu Yoshida

Yasushi Kinoshita

Hideo Suenaga

Naomitsu Kuroda

Tetsuo Ito

Atsushi Kazama

Yoshitaka Kusano

Hiromitsu Imamiya

Fumihito Ichikawa

Zhiyan Gao

Zhi Yan Gao

Keiko Saito

A head mounted display includes a first optical housing mounting a light source and an optical component, a second optical housing mounting an image generating element and an optical component, a securing member connecting and securing the first optical housing and the second optical housing, and an exterior housing holding the first optical housing, the second optical housing, and the securing member. The securing member is fitted with the first optical housing with the second optical housing enclosed to connect and secure the first optical housing and the second optical housing.

Head mounted display

An image projection optical module including: an image generating element configured to generate an image; an image display unit configured to display the image; and a coupling member thermally connected to the image generating element, the coupling member including a front heat dissipation portion on a front portion of the coupling member when a direction of line of sight of a user wearing a casing of a head mounted display provided with the image projection optical module is defined as a forward direction, the front heat dissipation portion being to dissipate heat.

Image projection optical module and head mounted display

Provided is a scanning type image measuring apparatus capable of reducing an imaging time while suppressing an increase in power consumption. The scanning type image measuring apparatus includes an objective lens scanning mechanism for operating an objective lens in a first direction and a second direction perpendicular to the first direction, wherein, with respect to a resonance frequency related to a spring constant of a support member supporting a movable unit including the objective lens and a mass of the movable unit, the resonance frequency in the second direction is set to be higher than the resonance frequency in the first direction, and a scanning frequency of the objective lens in the second direction is set to be higher than the resonance frequency in the second direction.

Scanning type image measuring apparatus and scanning type image measuring method

An optical pickup, including a housing, and an optical element mounted on the housing, wherein the optical element is fixed onto wall surfaces of the housing via adhesive agents on both sides of a certain single surface of the optical element, the optical pickup, further including a protrusion portion on the other side of a surface with the optical element positioned therebetween, the surface being orthogonal to the wall surfaces of the housing, the protrusion portion protruding from the housing, the front end of the protrusion portion protruding than the adhesive agents in a direction away from the wall surfaces.

Optical pick up including protrusion portion to position optical element

High-performance and reliable objective lens driving apparatus and optical pickup wherein the tilt of an objective lens relative to an optical disc is suppressed are provided. The optical pickup is equipped with a semiconductor laser, an electro-optic component, and the objective lens driving apparatus. In this optical pickup, the objective lens driving apparatus is comprised of: a moving part including an objective lens, a holder that holds the objective lens, a focusing coil, and a tracking coil; a holding member for elastic support members that couples together multiple elastic support members providing elastic support on a fixed part and the moving part and is mounted on the moving part; the elastic support members that elastically support the moving part from the fixed part; and the fixed part. The holding member for elastic support members mounted on the moving part and the holder that holds the objective lens are joined together by fitting together a concavity and a convexity.

Objective lens driving apparatus, optical pickup

In the object lens drive unit including a lens holder with an object lens attached to, a plurality of driving coils attached to the lens holder, connection substrates attached to both sides of the lens holder, and a plurality of suspension wires with end parts thereof connected to the connection substrates for operatively supporting the lens holder, a plurality of sets of wire connection electrodes for connecting the suspension wires and coil connection electrodes electrically connected to the wire connection electrodes for connecting terminal wires of the coils are arranged in line in an optic axis direction of the object lens and the wire connection electrodes and the coil connection electrodes are formed in a symmetric shape to a central axis parallel to the optic axis direction on the connection substrates.

Object lens drive unit and optical pickup using the same

In an optical pickup equipped with a semiconductor laser, electro-optical components such as a lens, and an objective lens drive device, the objective lens drive device includes objective lenses, a holder holding the objective lenses, a focusing coil, and tracking coils. The focusing coil is wound in parallel to the optical surface of the objective lens, and formed in a parallelogram shape having inclined portions provided near the tracking coils. The two tracking coils are placed on diagonal portions of the lens holder.

Objective lens drive device and optical pickup

An optical pickup which excels in assembly workability and which can increase the drive force generated in a focusing coil is provided. The optical pickup has an objective lens, a lens holder holding the objective lens, and a first and a second focusing coil wound around the lens holder. The first focusing coil includes an upper part wound about a central axis extending in parallel with an optical axis of the objective lens and a lower part connected to the upper part. The second focusing coil includes an upper part wound, in a wiring system separate from the first focusing coil, about a central axis extending in parallel with the optical axis of the objective lens and a lower part connected to the upper part.

Optical pickup

An optical pickup whose thickness is small and power consumption is low is provided, in which these advantages are achieved by increasing the driving force generated in the tilt coil in an objective lens driving apparatus and by making the thickness of the objective lens driving apparatus to be small. In an optical pickup including: an objective lens for condensing light onto an optical disc; a lens holder to which the objective lens has been attached; a focusing coli, a tracking coil, and a tilt coil, which have been attached to the lens holder; and a reflection mirror for reflecting light toward the optical axis of the objective lens, the tilt coil is made to have a shape in which the tilt coil is not brought into contact with the side of the reflection mirror, the side being near to the objective lens.

An optical pickup includes an object lens; a moving part including the object lens and coils; rod-shaped support members disposed in a focusing direction, one end of each of the support members being attached to side surfaces of the moving part in a tracking direction; a fixing part for fixing the other end of each of the support members; a yoke including magnets; and gel holding parts, each of the gel holding parts including walls on both sides of the support members in the tracking direction, and the support members being disposed on both sides of the moving part in the tracking direction. Each of the gel holding parts includes an opening at one end on an optical disc side in the focusing direction and includes a cutout in the wall farther from the object lens in the tracking direction, the cutout extending from an edge of the opening.

In an optical pickup for use in an optical disc device, wire rods are wound directly around a lens-coil holder to make tracking coils and focus coils. The lens-coil holder is divided into three holders, one of which holds an optical lens thereon and has on its sides wire-winding protrusions for wiring wire rods therearound to make tracking coils. The remaining holders have focus coils that are wound therearound. Alternatively, the lens-coil holder is divided into two holders, one of which has on its sides wire-winding protrusions for wiring wire rods therearound to make tracking coils. The remaining holder holds an optical lens thereon and has focus coils that are wound therearound. The lens-coil holder has a cavity for letting pass through a laser beam emitted in parallel to an optical disc surface.

An optical pickup includes an objective lens, a lens holder which holds the objective lens, a focusing coil attached to the lens holder having the winding axis directed at the optical axis of the objective lens, and a magnet provided opposite the side surface of the lens holder. A protruding portion is attached to the side surface of the lens holder at a side apart from the objective lens with respect to the optical axis direction of the objective lens farther than the focusing coil.

An objective lens actuator, for driving an objective lensfor focusing lights upon a recoding surface of an optical disc, comprises a moving part, which comprises the objective lensand a coil; a magnet, which is fixed on a yoke and drives the moving part; a plural number of elastic support parts, each of which supports the moving partat an end thereof; a first fixing portionand a second fixing portion, which fix other ends of the plural number of elastic support partsand are disposed opposite to each other in a focus direction; and a moving mechanism, which is provided on the first and second fixing portionand, so that the first and second fixing portionsandcan move in the focus direction, relatively, and thereby providing the objective lens actuatorenabling to reduce the dynamic relative tilt between the optical disc and the objective lens(i.e., reducing the tilt of the objective lensin the tangential direction when operating), as well as, an optical pickup and an optical disc drive.

Objective lens actuator for enabling to reduce the dynamic tilt between optical disc and objective lens

An optical pickup, mounting a lens actuatorthereon, the lens actuator comprises: a lenshaving an optical axis in direction in parallel with an optical disc; a holderwhich holds the lens thereon; a first guide shaftholding the holder, so as to regulate the holder to change a position thereof, into an inner surface direction of a surface having the optical axis of the lens as a normal line vector thereof; a second guide shaftwhich regulates the holder to change the position thereof, into a normal line vector of an optical disc; and a reed screw, which moves the holder into direction of the optical axis of the lens, wherein a distance between the optical axis of the lens and the optical disc, a distance between a central axis of the first guide shaft and the optical disc, and a distance between a central axis of the second guide shaft and the optical disc are lager than a distance between a central axis of the reed screw and the optical disc.

Lens driving mechanism for optical pickup and optical disc apparatus

The present invention provides an object lens actuator in which a tilt of an object lens due to a change of an ambient temperature is inhibited even when a metal member is attached to a resin based securing part. It is desirable to improve quality of writing and playing in a disc drive using the object lens actuator. This is achieved by coupling a metal member having a flat portion and bent portions to a securing part near top ends of the bent portions. The flat portion has a normal in the focusing direction. The bent portions extend in the focusing direction from the respective ends of the flat portion in the tracking direction. The securing part has an opening therethrough in the focusing direction, and in the opening, the metal member and the securing part may be coupled between each outermost two support members in the focusing direction.

Object lens actuator and disc drive using the same

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Kasumigaura, Japan

Katsuhiko Kimura