Dainichiseika Color & Chemicals Mfg. Co., Ltd.

National Institute of Advanced Industrial Science and Technology

Inter Energy Co., Ltd.

Other

Dainichiseika Color & Chemical

Shigeru Takarada

Norio Tanaka

Ichiro Ueno

Takashi Hiraga

Noritaka Yamamoto

Shiro Futaki

Hirobumi Watanabe

Michiei Nakamura

Hiroyuki Shimanaka

Hiromitsu Yanagimoto

Toshiko Mizokuro

Nobutaka Tanigaki

Noriyasu Shiga

Shotoku Takami

Keiji Nakajima

Kazutaka Aoki

Yukio Kanbara

Masakatsu Kai

Masahiko Aoba

Kotaro Ohshima

Shinya Tuchida

An optical path switching type optical signal transmission/reception apparatus includes a one-to-seven compatible optically controlled optical path switching apparatusthat is connected to a host optical signal transmission/reception apparatusvia an optical fiber, a total of seven subordinate optical communication adaptersconnected via optical fibers, user side devicesconnected to respective subordinate optical communication adapters via an electric circuit, an optical transmission/reception control circuit provided in each of the total of seven subordinate user side optical communication adapters, and including an uplink optical signal transmission mechanism, a downlink optical signal reception mechanism, a control light source that can generate control light to drive the optical path switching apparatus, in which a wavelength of the generated control light is different from a wavelength of signal light, and an optical communication oriented transmission/reception mechanism using the wavelength of the control light source, optical pathstodedicated to the control light to connect the optical path switching apparatusto the seven user side optical communication adapters, and a reflection-type star coupler.

Optical path switching signal transmission/reception apparatus and corresponding method

An optical-path-switching apparatus according to the present invention includes a reducing optical system capable of guiding signal light and control light along the direction of gravity into a thermal-lens-forming optical element having an incidence plane positioned to be perpendicular to the direction of gravity in such a way as to differentiate respective convergence points in a direction perpendicular to the optical axis. The apparatus further includes a light-receiving unit configured to converge or condense straight-traveling signal light in the absence of irradiation with the control light and signal light whose optical path has been switched due to irradiation with the control light using the same optical element. Further, the apparatus includes a wedge-type prism provided at a passing position of the optical-path-switched signal light to increase the distance between the optical axis of the optical-path-changed signal light and the optical axis of the straight-traveling signal light.

Optical-path-switching apparatus and light signal optical-path-switching method

A thermal lens forming element includes a first chamber serving as a control light absorbing region, which is configured as a columnar body or an N prismatic body (wherein N is an integer equal to or greater than 4) circumscribing the columnar body and filled with a control light absorbing dyestuff solution containing a solvent having a viscosity of 0 to 3 mPa&#xb7;s at 160&#xb0; C. or above and a ratio of the viscosity of the solvent at 160&#xb0; C. to a viscosity of the solvent at 40&#xb0; C. not less than 1 and not greater than 6, wherein the columnar body or the N prismatic body circumscribing the columnar body has a central axis coinciding with an optical axis of incident signal light. The first chamber is connected to a second chamber via a solution channel and a dam. The dyestuff solution and a bubble of an inert gas are confined in the second chamber.

Thermal lens forming element

Colored fine particulate resins can each be produced by bringing a colored resin, which comprises a thermally fusible resin and a colorant evenly distributed in the thermally fusible resin, into a molten state; forming the colored resin, which is in the molten state, into droplet-shaped fine particles in a non-dissolving medium which does not dissolve the colored resin; and then cooling and solidifying the droplet-shaped fine particles. The colored fine particulate resins are useful in image recording materials, printing materials and paints. Articles can be colored with the image recording materials, printing materials or paints.

Production process of colored fine particulate resins, colored fine particulate resins, and coloring process of articles

A composite pigment of a bluish green color comprises copper phthalocyanine and aluminum phthalocyanine which are preferably in the form of a mixture or solid solution. The composite pigment can be produced by mixing copper phthalocyanine and aluminum phthalocyanine into a mixture and then converting said mixture into a pigment form. A coloring composition comprises at least a resin and a pigment which comprises copper phthalocyanine and aluminum phthalocyanine. The coloring composition can be produced by mixing copper phthalocyanine and aluminum phthalocyanine which have been independently comminuted, into a composite pigment, and then kneading the pigment and a resin such that the pigment is dispersed in the resin. An image recording substance is produced using the coloring composition. The image recording substance can be a dry developer of a fine powder form or a wet developer of a liquid form, an ink-jet ink, or a thermal transfer ink ribbon with the coloring composition coated on a film-shaped or sheet-shaped base material.

Composite pigments, coloring compositions, and image recording substances

The present invention provides a method of controlling light and an apparatus of controlling light capable of extracting sufficiently large and speedy optical responses from the photoresponsive photoelement with a high reproducibility, wherein the control light is emitted from the light source,, and the signal light from the light source,. The control light and signal light are converged by the converging lens,, and illuminated to the film photoelement,filled in with the photoresponsive composition. Via the collimate lens,and the band-pass filter,, only the signal light is detected with the photodetector,. By turning the control light on and off, the transmittance and/or refractive index of the signal light are reversibly increased or decreased, realizing the modulation of photointencity. By setting the numerical aperture of the collimate lens at the value essentially smaller than the numerical aperture of the collimate lens, sufficiently large and speedy optical responses can be extracted from the photoelement comprised of photoresponsive composition containing dye.

Method and apparatus for controlling photointensity and/or luminous flux density of a signal light

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Tokyo, Japan

Shigeru Takarada