Abstract: An optical disk for information interchange having two distinct areas, one of which is comparatively wider than the other, each of the areas having a different tracking information format, so that an apparatus can analyze the optical disc regardless of the tracking information format implemented in the apparatus. The two areas can be separated by a third disk portion which has no tracking information.

Abstract: A fluorescent screen includes a substrate made of a light-scattering material and a mixture of an organic fluorescent substance and a binder dispersed therein. Since the luminescent light is scattered by the light-scattering material, the light emitted from the screen is increased to a level higher than that of a conventional fluorescent screen to enhance brightness thereof.

Abstract: Disclosed is a resin composition for ultraviolet luminescent screen comprising one or more of luminescent compound represented by the formula (I): ##STR1## wherein X is ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are individually a hydrogen atom, halogen atom, alkyl, alkoxy, amino, alkylamino, dialkylamino, anyl or aralkyl, and Y is perfluoroalkyl, and A.sup.+ is a cation represented by the formula (II): ##STR3## wherein R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are individually a hydrogen atom, alkyl or aralkyl and may be combined with each other to form a ring, or a pyridium cation which may have a substituent, or a phosphonium cation.

Abstract: An optical recording medium having a recording layer containing a particular cyanine dye matter and a particular quencher. The material of the recording medium can be directly applied to the injection-molded substrate without any damage to the substrate. The productivity of this recording medium is therefore high. This medium also has superior recording/reproduction characteristics.

Abstract: An information recording medium comprising a pair of disk substrates at least one of which has an optical recording layer on one surface thereof, wherein the substrates are bonded to each other by using a silicone type adhesive, directly or by the medium of a spacer, so that the recording layer may be disposed inside of the substrates. Platinum is incorporated in the above-mentioned silicone type adhesive by using a platinum type crosslinking catalyst, without using the conventional benzoyl peroxide type crosslinking catalyst. Accordingly, there is provided the information recording medium excellent in mechanical strength, reliability and durability.

Abstract: An LB film forming device according to the present invention having a packing control device by which a barrier is moved under the control of the packing control device to compress a sample until the sample spreading over the surface of a subphase liquid provides a predetermined set surface pressure, the absorbance of the thus compressed sample is measured, and thereafter the barrier is moved under the control of the absorbance as desired so as to provide a predetermined set value of the absorbance. Such an LB film forming device may stably provide a film having predetermined film characteristics.

Abstract: A laser projection type display unit. A light modulator is provided between a laser light source and a galvanometer scanner. By cutting off the laser beam or modulating the amplitude of the laser beam by means of the light modulator, independent point groups can be displayed.

Abstract: A recording and readout method for a multi-layer recording film including providing a multi-layer recording film comprising a laminate of plural recording films having a light absorption band in a predetermined wavelength region and having an intrinsic absorption peak; and supplying to the multi-layer recording film a light having a wavelength which is substantially the same as that of the absorption peak of each recording film to effect recording and readout; wherein provided that the light absorption band of the recording film having the absorption peak on the longer wavelength side selected from adjacent absorption peaks is present in a wave length region which is shorter than the absorption peak wavelength on the shorter wavelength side; the recording film having the absorption peak on the shorter wavelength side is caused to have an absorbance which is higher than the absorbance of the recording film having the absorption peak on the longer wavelength side at the absorption peak wavelength on the shorter

Abstract: An ultraviolet ray detecting device comprises an external light shielding structure for shielding an external light from entering there, a fluorescent member disposed in the external light shielding structure and containing a fluorescent substance, the fluorescent member being excited by an ultraviolet ray to thereby generate a fluorescence ray from the fluorescent substance, a light entrance window through which a light is guided and emitted to the fluorescent member, an ultraviolet ray pass filter for extracting the ultraviolet ray from the light through the light entrance means, and a light discharging window adapted to discharge the fluorescence ray generated by the excitation fo the fluorescent member. The ultraviolet ray pass filter may be eliminated to limit the light incident angle. The light shielding structure may be composed of a box or tubular member. The fluorescence ray discharging window is eliminated and a photodiode is disposed in contact to one end of the fluorescent member.

Abstract: A projection-type display apparatus has a light modulator for emitting a zero-order diffracted beam and a first-order diffracted beam which are added by a prism into a projecting light beam which is introduced into a light beam scanning system, which two-dimensionally scans a screen. The maximum intensity of the projecting light beam is increased to increase the brightness of the overall screen.

Abstract: An acousto-optical modulation device comprises a plurality of acousto-optic modulators arranged in series with each other, to receive a zero-order light from a previous stage of the modulators. A zero-order light emerging from the last stage is used as a modulated light of an incident light. The coefficient of extinction for the zero-order light is raised by this structure, and the acousto-optic modulation device presents a high diffraction efficiency and a high value of the coefficient of extinction at the same time.

Abstract: An optical disk manufacturing method comprises a step of preparing a master disk having an elastomer layer, formed on a transparent substrate and containing photosensitive dyes, and a polymer support layer, formed on the elastomer layer and having a glass transition temperature; a step of forming minute bumps on the master disk by irradiation of a focusing laser beam; a step of forming a metal layer on that surface of the master disk which has the minute bumps; and a step of forming a stamper layer on that surface of the master disk which is rendered conductive, thereby forming a stamper. According to another optical disk manufacturing method, the metal stamper forming step is replaced with a step of forming a transfer layer, made of a transparent ultraviolet-ray hardening resin, on that surface of the master disk which has the minute bumps, thereby forming a resin stamper.

Abstract: A beam index color display unit uses a single light beam scanning a two-dimensional screen of light beam sensitive three-color phosphor stripes arranged with regularity. The intensity of the light beam is modulated in response to information signals in a video signal while the scanning timing of the light beam is detected by light sensing devices disposed between each of phosphor stripes. Thus, images are displayed on the two-dimensional screen of the display unit.

Abstract: An optical characteristic adjusting apparatus for a laser beam radiation system comprises a transparent substrate which generates visible radiation in response to non-visible radiation, and a stand for positioning the substrate perpendicular to an optical axis of laser beam emitted from a laser beam radiation system. When the non-visible radiation irradiates the surface of the substrate, a bright spot is formed since the visible radiation is generated from the irradiated portion of the substrate. Therefore, an operator can appropriately adjust the optical characteristics of the non-visible radiation at both sides of the transparent substrate since the bright spot can be observed at both sides of the transparent substrate.

Abstract: A luminescent screen includes a plurality of columnar luminescent elements made of a transparent material which contains a substance capable of emitting luminescent light in response to stimulating light applied thereto, the columnar luminescent elements having central axes parallel to each other and having adjacent sides held against each other. Emitted luminescent light is prevented from leaking in a direction normal to the longitudinal direction of the columnar luminescent elements, thereby increasing the brightness of the entire luminescent screen. Since the columnar luminescent elements of the luminescent screen are not integrally joined as a continuous unitary structure, any leaking luminescent light from the adjacent luminescent elements or regions is reduced.

Abstract: A luminescent screen includes a screen plate containing a substance capable of emitting luminescent light in response to stimulating light applied thereto, and a regular array of convexes on one surface of the screen plate for trapping emitted luminescent light that is directed into the screen plate and for directing the trapped luminescent light toward a display surface of the screen plate. The brightness of the display surface is therefore increased.

Abstract: A luminescent screen includes a screen plate containing a substance capable of emitting luminescent light in response to stimulating light applied thereto, and a reflecting layer on one surface of the screen plate for directing emitted luminescent light from a reverse surface of the screen plate toward a display surface thereof. The brightness of the display surface is therefore increased.

Abstract: Disclosed is a ladder silicone oligomer composition which comprises [A] 100 weight parts of a ladder silicone oligomer containing 1 to 10 weight % of hydroxyl groups and 1 to 10 weight % of ethoxy groups, [B] 1 to 200 weight parts of at least one silicon-containing compound selected from (a) silicone oligomers and polymers having a number average molecular weight of 500 to 100,000, which are obtained by reacting a compound of the following formula (I): ##STR1## wherein R.sub.1 is lower alkyl or phenyl, and R.sub.2 is lower alkyl, with a compound of the following formula (II): ##STR2## wherein R.sub.3 is lower alkyl, or phenyl, and R.sub.4 is lower alkyl, the molar ratio of the compound (I) to the compound (II) being from 1/0.3 to 1/9, and (b) ethyl silicates having a silica content of 28.8 to 45 weight % and hydrolysis products thereof, and [C] an organic solvent. The ladder silicone oligomer composition is useful as a coating material and an adhesive.

Abstract: A lenticular luminescent screen includes a lenticular base plate made of a transparent material which contains a substance capable of emitting luminescent light in response to stimulating light applied thereto. The lenticular base plate having at least one surface composed of a plurality of adjacent partly cylindrical lens elements. Since the cylindrical lens elements can catch stimulating light with a higher efficiency, the luminescent screen can emit an increased intensity of luminescent light. Inasmuch as the luminescent screen is reduced in thickness between the adjacent cylindrical lens elements, emitted luminescent light is prevented from leaking in a direction across the axes of the cylindrical lens elements.

Abstract: A laminate is disclosed, comprising substrates which are impregnated with a curable composition, laminated and cured, wherein the curable composition comprises (i) a curable prepolymer having a main chain consisting essentially of a random copolymer of a vinyl monomer and an acrylic or methacrylic monomer, and a side chain containing an acryloyl or methacryloyl group at the terminal, as a main component, and (ii) a crosslinkable vinyl monomer.