Asahi Glass Company, Limited

Seimi Chemical Co., Ltd.

Norihito Nakazawa

Masahiro Hirano

Atsushi Hayashi

Shoichi Takeuchi

Motoshi Ono

Iori Yoshida

Satoshi Takemiya

Hiroaki Shimozono

Yoshinori Kon

Yuji Aizawa

A heterocyclic benzene compound such as benzotriazole, is dissolved in at least one substance selected from the group consisting of a primary alcohol having from 1 to 4 carbon atoms, a glycol having from 2 to 4 carbon atoms, an ether represented by the Formula 2 (wherein m is an integer of from 1 to 4), N-methyl-2-pyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide, &#x3b3;-butyrolactone and propylene carbonate, and an aqueous dispersion of fine oxide particles which constitute abrasive grains is mixed therewith, whereby a polishing compound is obtained. By use of this polishing compound in polishing a substrate provided with an insulating filmon which a wiring metal filmand a barrier filmare formed, the formation of an embedded wiringis made possible with low dishing, low erosion and low scratching at a high removal rate.

Polishing compound, method for production thereof, and polishing method

A holographic display device, e.g. for a vehicle, which reduces a color of hologram reflection toward the outside of the vehicle or a color of hologram transmission toward the inside of the vehicle generated at a hologram installation portion of a wind-proof glass, and which further reduces an external light noise. Light from a display element is transmitted through an imaging optical component to form a display image on a transmission diffusion hologram provided to a wind-proof glass, and the display image is reflected on the surface on the vehicle outer side of the wind-proof glass for visual recognition by an observer. The above transmission diffusion hologram is produced by diffused light, which is transmitted through a diffusion optical component, being made to fall on one side of a hologram photosensitive material.

Holographic display device and method for producing a transmission diffusion hologram suitable for it

As a combiner, a hologram prepared by exposure to light is used wherein a combination of the central wavelength .lambda., the halfwidth .DELTA..lambda. and the diffraction efficiency .eta. of the diffraction spectrum of light minimizes the color difference between the color tone of light from a light source and the color tone in average of reflection light by the combiner, when observed by changing the angle, or the sum of the square of the color differences between the color tone of the light from the light source when observed by changing the angle and the color tone of the reflection light by the combiner. Then, the color tone of the light transmitting from the outside of a vehicle through the combiner, the light being observed by the driver of the vehicle, and the color tone of an outer light reflected by the combiner, the light being observed at the outside of the vehicle, approach a white color in comparison with use of a conventional combiner, whereby a transparent eyesight without any complementary color is given to the driver to thereby increase safety. Further, a head-up display which reduces a change of color even though an observer outside the vehicle looks at the combiner at any angular position and which gives a color tone near a white color, can be provided.

Head-up display, a combiner used for the head-up display and a method of

A hed-up display comprises a light source and a liquid crystal display device for displaying an image, and a hologram arranged on a windshield glass of a vehicle to diffract the light to an observer, wherein the hologram has the half width of the diffraction spectrum so that a white light entering into the vehicle from the outside is diffracted as substantially a white light.

Head-up display and a combiner used to control diffraction of light

Growing community of inventors

Yokohama, Japan

Norihito Nakazawa