Hitachi-Lg Data Storage, Inc.

Hitachi Media Electronics Co., Ltd.

Michio Hatagi

Satoshi Ouchi

Yoshiho Seo

Tomoto Kawamura

Hiroshi Ogasawara

Yuya Ogi

Ryuji Ukai

Kunikazu Oonishi

Nobuhiro Konuma

Hiromi Kusaka

Hiromi Kita

Akio Yabe

Satoshi Oouchi

An image display deviceincludes a laser light source unit, a screenformed of at least two diffusion members, a vibration mechanismvibrating at least one diffusion member, and a scanning elementscanning laser light in a first direction (a y direction) on the screen and a second direction (an x direction) orthogonal to the first direction. A scanning speed of the scanning elementin the second direction is faster than a scanning speed in the first direction, and a diameter D of the laser light in the first direction on the screen is greater than an interval Yp in the first direction on the scanning trajectory in the second direction on the screen. Accordingly, it is possible to provide an image display device displaying an image having a low speckle with high luminance, without vibrating the diffusion member at a high speed.

Image display device

A laser projection display device () includes a laser source (), a laser driver () that drives the laser source, a scanning unit () that scans and projects laser light generated by the laser source, a liquid crystal element () that transmits the laser light at a predetermined transmittance, and a liquid crystal driver () that changes the transmittance by applying a voltage to the liquid crystal element. When a light quantity of the laser light generated by the laser source corresponds to a case in which the laser source operates in a nonlinear area, the laser driver shifts an operation point to an area other than the nonlinear area by increasing a driving level of the laser source by a predetermined amount G, and the liquid crystal driver decreases the transmittance of the liquid crystal element by a predetermined amount 1/G.

Laser projection display device

A scanning type projector two-dimensionally projecting a laser beam and generating an image according to the present invention comprises: a light source having a light intensity corresponding to a pixel of the image and emitting a laser beam having an elliptical beam; a collimator lens collimating a laser beam emitted from the light source without converting the same into focused light; a beam contracting/shaping element that reduces a luminous beam width in a predetermined direction of the laser beam emitted from the collimator lens; a condensing lens that converts a laser beam emitted from the beam contracting/shaping element into focused light corresponding to a projection distance; and a two-dimensional scanning unit configured to two-dimensionally scan and project a laser beam emitted from the condensing lens.

Scanning type projector

An optical scanning device includes a rotationally-moving mirror on which a reflection plane is provided in a rotationally-movable manner, and a sealing unit over which a light-transmissive cover is provided, a first plane of the light-transmissive cover, a second plane of the light-transmissive cover, and the reflection plane of the rotationally-moving mirror within a rotationally-moving range being non-parallel to each other, the first plane being on the opposite side to the side of the rotationally-moving mirror, the second plane being on the side of the rotationally-moving mirror.

Optical scanning device and image display apparatus

A thin-type optical head, smaller in optic mounting spaces comprising to the conventional one, in an optic system enabling with BD including a 2-layers BD, DVD an CD, comprises a light source, for emit a light beam therefrom; an optical branch element for penetrating a predetermined amount of lights, therethrough, of an incident light beam thereon, and to reflecting remaining amount of lights thereupon; a light focusing element for focusing the light beam upon an optical information recording medium; a photo detector for receiving the light beam reflecting upon the optical information recording medium; and an optical path converter element for converting an angle of an optical path, on which the light beam propagates, wherein the optical path converter element is disposed on an optical path of the light beam between the optical branch element and the photo detector, or between the optical branch element and the light source, and has an incident surface, upon which the light beam enters, and an emission surface, from which the light beams emits, so that the light beam reflects at least two (2) times within the optical path converter element, during time when passing through between the incident surface and the emission surface.

Optical head

Growing community of inventors

Chigasaki, Japan

Michio Hatagi