Hitachi-lg Data Storage, Inc.

Hitachi High-tech Corporation

Hitachi, Ltd.

Takeru Utsugi

Toshifumi Honda

Tomoto Kawamura

Ryuji Ukai

Hiromichi Yamakawa

Takeshi Shimano

Kazuyoshi Yamazaki

Toshiteru Nakamura

Kazuyuki Tajima

Takuma Kuno

Mitsuru Nagasawa

Takahiro Mouri

Masahito Uchiyama

Kenshiro Ohtsubo

Andreas Karsaklian Dal Bosco

A defect inspection apparatus that includes a differential interference contrast illumination system that irradiates a sample surface with an illumination spot set composed of two polarized illumination spots that have different phases at a predetermined wavelength and that are offset by a predetermined shear amount, a differential interference contrast detection system that condenses reflected light beams of the two polarized illumination spots reflected from the sample surface to generate interference light beams, a scanning unit that scans the sample surface using the two polarized illumination spots, a sensor unit that photoelectrically converts the interference light beams generated by the differential interference contrast detection system to generate interference signals, a height displacement measurement unit that processes the interference signals to measure height displacement between the illumination spots, and a height shape reconstruction unit that accumulates height displacement data of the illumination spots and reconstructs a height shape of the sample surface.

Surface inspection device and shape measurement software

According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display deviceconfigured to display a video includes a video projection unitconfigured to project video light, a video deflection unit, and a light guide portion. The video deflection unitdeflects video light emitted by the video projection unitand causes the video light to propagate to the light guide portion, and the light guide portioncauses the entered video light to propagate therein and outputs the video light. Here, the video deflection unitor the light guide portionis configured to reduce color dispersion of the video light outputted from the light guide portion

Video display device and video display system

A defect inspection apparatus includes a first objective lens having an optical axis is perpendicular to a wafer mounting surface of the stage, a second objective lens having an optical axis forms a predetermined acute angle with respect to the wafer mounting surface of the stage, and a dichroic mirror which reflects light having a first wavelength and transmits or reflects light having a second wavelength. Emitted light of a first optical pathfrom a first light source which is reflected from or transmitted through the dichroic mirror and first emitted light and second emitted light polarized and separated from a second light source which are transmitted through or reflected from the dichroic mirror are incident on the first objective lens, and emitted light of a second optical path from the first light source is incident on the second objective lens.

Defect inspection apparatus and defect inspection method

Provided is a waveguide having a light diffraction unit that diffracts incident light by a multiplex-recorded hologram, in which, in the light diffraction unit, a plurality of holograms having different angles with respect to an incident surface of the waveguide are formed, and when certain parallel light beams are incident, different wavelengths are diffracted by the plurality of holograms.

Waveguide, waveguide manufacturing apparatus, waveguide manufacturing method, and video display device using the same

It is an objective of this disclosure to protect a highly transparent hologram light guide plate from water vapor and ultraviolet ray, thereby suppressing deterioration of the hologram light guide plate even when employed in a head mount display used in outdoor environments. A hologram light guide plate according to this disclosure comprises a protection layer that protects a hologram layer and an intermediate layer that is placed between a glass layer and the protection layer, wherein the glass layer and the hologram layer form a transfer layer that transfers image light. The intermediate layer causes the image light to transfer only in the transfer layer in a section from an input area of the image light to an output area of the image light.

Hologram light guide plate with plurality of layers and head mount display using hologram light guide plate

The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding platehaving a light diffracting portionfor diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when lightof a single wavelength having a certain angular range is incident, at least two or more outgoing raysare discretely emitted with a first angular space &#x3b8;s, and the emitted rays each have a second angular range &#x3b8;a, and the first angular space &#x3b8;s is equal to or larger than the second angular range &#x3b8;a.

Light-guiding plate, light-guiding plate manufacturing method, and video display device

This imaging device comprises: an image sensor which converts an optical image, captured by pixels arranged in an array on an imaging surface, into an image signal and outputs the image signal; a modulation unit which is provided to a light-receiving surface of the image sensor and modulates the intensity of light; and an image processing unit which carries out image processing on an output image output by the image sensor. The modulation unit has a grating substrate and a first grating pattern formed on a first surface of the grating substrate facing a surface of the image sensor near the light-receiving surface. The grating pattern is configured from a plurality of concentric circles having pitches which are inversely proportional to the distance from the origin point of at least one reference coordinate, the concentric circles do not overlap with each other within the grating pattern.

Imaging device

To reduce an influence of stray light and stably record/reproduce high-quality data in holographic recording/reproduction. A holographic memory device includes an optical system that guides a reference beam to an optical information recording medium at a desired angle of incidence, a control part that controls the angle of incidence of the reference beam generated in the optical system, and a lens part that images the reference beam in a desired position of the optical information recording medium. Further, at least a first light beam at a first angle and a second light beam at a second angle different from the first angle are output from the optical element, and the optical element is provided so that the first light beam may propagate within an effective diameter of the lens part and the second light beam may propagate to an outside of the effective diameter of the lens part.

Growing community of inventors

Tokyo, Japan

Takeru Utsugi