Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Motomu Yoshimura

Mitsuo Maeda

Tetsuya Nishimura

Eiji Yagyu

Kazuo Okada

Kazuhiko Nakane

Masaharu Ogawa

Hajime Nakajima

Kyosuke Yoshimoto

Minoru Ozaki

Hiroaki Urushibata

Kunimaro Tanaka

Michihiro Tadokoro

Mitsuie Matsumura

Koichi Takeuchi

Masayoshi Shimamoto

Kouichi Yamada

Yoshiki Nakajima

Fumio Matsuda

Masatomo Seya

Noriaki Tsukada

The present invention relates to a recording member having an inherent optical absorption wavelength range and a property of changing optical absorption spectral characteristics before and after the absorption of light to record informations by absorbing a light within the optical absorption wavelength range. In order to shift the wavelength range of this optical absorption spectrum toward longer wavelengths, at least one kind of substituents having a .pi. electron system, an electron donative property or an electron acceptive property is used as a substituent of a molecule constructing the recording member in an optical recording material. Such an optical recording material can be used in memories in the computer system and the like.

Optical recording material

The invention relates to an optical computing element for use in an optical computer utilizing computing light rays having a plurality of wavelength components. The optical computing element comprises a photo-chemical hole burning element which functions as a wavelength selecting filter of the computing light rays. Therefore, the optical computer using the photo-chemical hole burning element of the invention can perform arithmetic operations by taking advantage of differences in optical wavelength. The computer can efficiently perform bulky arithmetic processing, and can also speedily perform arithmetic operations through simultaneous parallel processing for information.

Optical computing element

Optical computer element

In an optical recording medium, 4,8-diamino-2-(4-hexyloxyphenyl)-1,5-dihydroxyanthraquinone is used as guest molecules, for an optical recording layer, and a compound expressed by a general formula (1): ##STR1## (where R.sub.1 denotes H or CH.sub.3, R.sub.2 denotes C.sub.2 H.sub.4, C.sub.3 H.sub.6 or C.sub.4 H.sub.8, and n denotes an integer) is used for the host molecules. Since holes are caused in the wavelength region of the semiconductor laser, optical recording can be performed efficiently by using a semiconductor laser.

Optical recording medium

A frequency multiple outgoing light is obtained by intensity-modulating a frequency multiple incident light in frequency domain, after irradiating a pump beam to an optical recording medium consisting of photochromic material and the like to generate optical Stark effect thereon and shifting the light absorption spectrum of the optical recording medium by optical Stark effect.

Optical frequency multiple signal processing method

A wavelength selective optical recording and reproducing method includes an optical recording and reproducing step of information composed of time series signals on a recording medium having recording tracks as position series signals with light having a variable wavelength while switching the wavelength between predetermined values.

Wavelength selective optical recording and reproducing method

An apparatus in accordance with the present invention sequentially fixes the wavelength of a light beam irradiated from a light source whose oscillation wavelength sequentially varies to a plurality of different wavelengths to a recording medium to required wavelengths each capable of forming a hole at absorption spectrum of the recording medium, synchronizes timing of change of the wavelength of the light source with timing of recording or regenerating each bit of information, records the optical hole formed in a manner that each bit of information corresponds to the wavelength varying in sequence, and detects the formed hole to regenerate information. Furthermore, the holes formed by the same wavelength are recorded at the positions separated by a distance capable of avoiding interference, while the holes formed by different wavelengths in correspondence to each bit of information are recorded at nearly the same position while that position is slightly displaced at a time, and thereby information is multiple-recorded with high density.

Frequency selective optical data record/regenerate apparatus

Optical recording material containing photochromic compounds

A wavelength selective optical recording and reproducing device has a reference wavelength in a marker hole of a medium. The optical detector is adapted to detect light which is reflected from or transmitted through the marker hole. A phase detector detects the phase of an output of the optical detector by using a high frequency signal as a reference to obtain a signal indicative of the deviation of the wavelength of the output from a desired wavelength. A wavelength regulator is responsive to the wavelength deviation to control the wavelength of the light source to be the desired wavelength.

Wavelength selective optical recording and reproducing device

An optical recording system which includes a recording medium of which the light absorption spectrum changes when exposed to light; a first transparent substrate provided on a first side of the recording medium; a plurality of first parallel transparent elongated electrodes provided on the first substrate; a second substrate provided on a second side of the recording medium opposite to the first side; a plurality of second parallel elongated electrodes provided on the second substrate in the direction perpendicular to the first elongated electrodes so as to form a plurality of recording spots at their intersections; a light source for directing a light beam to a plurality of the recording spots on the recording medium; and an electric field applying device for controlling the field strength of an electric field applied to a plurality of the recording spots to control the degree of change in the light absorption spectrum so that multiplex information recording is made in a dimension of electric field.

Optical recording system

A fused carbonate-type fuel cell is disclosed in which a reforming catalyst body comprising a catalyst supported on a carrier and secured or held in a porous body is arranged in a fuel gas passage. In this fuel cell, a reaction gas is uniformly contacted with the reforming catalyst, propagation of wetting by the electrolyte is prevented, and decrease in activity of the reforming catalyst can be suppressed to a very low level. Furthermore, this catalyst body can be easily handled.

Growing community of inventors

Amagasaki, Japan

Motomu Yoshimura