Hitachi, Ltd.

Kasei Optonix, Ltd.

Hajime Morishita

Saburo Nonogaki

Shoichi Uchino

Nobuaki Hayashi

Masahiro Nishizawa

Kiyoshi Miura

Yoshifumi Tomita

Motoo Akagi

Osamu Sasaya

Takahiro Kohashi

Hiroshi Yokomizo

Toshikatsu Manabe

Michiaki Hashimoto

Masato Ito

Teruki Suzuki

Yoshiyuki Odaka

Susumu Ohmatoi

A photosensitive composition comprising a water-soluble polymer, a dichromate and at least one aromatic diazonium salt selected from aromatic diazonium sulfates, sulfonates and chromates has high sensitivity, and a pattern having high resolution can be formed therefrom with a shortened exposure time.

Photosensitive composition containing water-soluble binder and aromatic

A black matrix color picture tube has a phosphor layer and black matrix layer formed on the inner surface of the faceplate. A layer of glass having a low softening point is provided between the phosphor layer and the inner surface of the faceplate and between the black matrix layer and the inner surface of the faceplate. The softening point of the glass is below the temperature at which the tube is subjected during a frit baking step employed in the fabrication of the tube. For example, a borophosphate glass is used as the layer of glass having a low softening point.

Black matrix color picture tube

This invention relates to a process for forming a pattern using a photosensitive composition comprising a polymeric azide and a high-molecular weight copolymer or polymer. The photosensitive composition comprises a copolymer containing at least a water-soluble non-photosensitive monomeric unit having an electrolytic functional group, a monomeric unit having an azido group and an electrolytic functional group and a high-soluble high molecular weight copolymer or polymer which exhibits reciprocity law failure characteristic.

Process for forming a pattern using a photosensitive azide and a

A light-transmitting layer is formed on a transparent glass panel, the light-transmitting layer having a larger refractive index than that of the glass panel, and a light-absorbing layer having a light-transmitting region is formed on the light-transmitting layer. The light reflected from the interface of the glass panel and the light-absorbing layer is effectively attenuated by the light-transmitting layer, so that it is possible to obtain an excellent image having a considerably strong contrast.

Face plate for display

A photosensitive composition comprising (1) at least one diazonium compound selected from among salts and double salts of diazonium ions represented by the general formulas: ##STR1## wherein A stands for a substituent selected from among ##STR2## wherein R.sub.1 and R.sub.2 each stand for an alkyl or benzyl group with the proviso that the total number of carbon atoms of R.sub.1 and R.sub.2 is 8 to 16, and (2) at least one nitrate selected from the group consisting of calcium nitrate and magnesium nitrate and a pattern forming process using such a composition. This composition gets sticky upon exposure to light.

Photosensitive composition and pattern forming process using same

A method of forming a color picture tube fluorescent screen by so-called dry process. After a photosticky substance mainly containing a diazonium compound is coated on a panel inner face, phosphor is adhered to portions of the compound which have been exposed to light through a color selection electrode and rendered sticky, and surplus phosphor applied on unexposed portions of the compound is removed, the above steps being consecutively repeated for phosphors of three colors to form picture elements of triads of three color phosphors on the panel inner face. The panel inner face is then treated with an aqueous solution containing at least polymer coagulant.

Method of forming phosphor pattern on fluorescent screen for color

A process for forming a pattern on the interior side of a face plate of a color picture tube by using a photosensitive composition comprising p-diazo-N,N-dimethylaniline chloride-zinc chloride double salt and a p-diazo-bromophenol chloride-zinc chloride double salt and conducting imagewise exposure of coated film of the photosensitive composition to light and contacting with powder particles at least one time gives higher sensitivity compared with a conventional process.

Process for forming pattern

A photosensitive composition turning shicky by light exposure, which comprises a salt or p-aminobenzenediazonium compound and at least one of salts of o- and m-aminobenzenediazonium compounds, has a distinguished effect in forming a phosphor screen of a color picture tube.

Process for forming powder pattern on light exposed layer having

A photosensitive composition becoming sticky upon exposure to light which comprises (a) a salt of a diazonium compound represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are independently --H, --CH.sub.3, --OCH.sub.3 or ##STR2## but R.sub.1 and R.sub.2 cannot be ##STR3## at the same time; and R.sub.3 and R.sub.4 are independently a straight-chain lower alkyl group, and (b) a salt of an aromatic diazonium compound having no --OH group directly bonding to a benzene ring, has an improved sensitivity because it contains the salt of the compound represented by the above formula. By using said photosensitive composition, there is provided a process for forming a pattern of powder coated layer excellent in light sensitivity.

A photosensitive composition improved in sensitivity by adding a salt of a compound represented by the general formula: ##STR1## (wherein R.sub.1 and R.sub.2 each represents a straight chain alkyl group, and X, Y and Z each represents H, a straight chain alkyl group or an alkoxy group, but two or more of X, Y and Z can not be H at the same time) to an aromatic diazonium salt which gets sticky upon exposure to light.

Powder deposition to form pattern on light imaged photosensitive

Photosensitive composition

The photosensitive resin which exhibits stickiness by photo-reaction is added with a binder which does not substantially raise dark reaction, and a resultant mixture is applied onto the inner surface of face panel of the color picture tube to form a film. Portion of the film where powdery material is going to be applied is exposed to light and rendered sticky. Phosphor powder, when used as the powdery material, is applied to the sticky portion and adhered thereto to form a fluorescent screen.

Method of forming fluorescent screen of color picture tube

A process for forming a phosphor screen of a color picture tube comprising forming a thin layer using a photosensitive composition which contains an aromatic diazonium salt as a photosensitive component and produces tackiness by exposure to actinic light on the surface of the substrate and contacting the tackified thin layer after exposure to light with phosphor particles to form each phosphor layer for emitting color is improved by using as the phosphor particles those coated with at least one surface coating material selected from the group consisting of Zn(OH).sub.2, Zn.sub.3 (PO.sub.4).sub.2 and AlPO.sub.4 in shortening the contact time between the thin layer and the phosphor particles.

Process for forming phosphor screens with treated phosphors

A patternwise coated powder layer can be formed by a process comprising the steps of coating a photosensitive composition, which contains an aromatic diazonium salt as a photosensitive component and becomes sticky by exposure, onto the surface of a substrate to form a thin layer, subjecting the thin layer to patternwise exposure with actinic radiation to produce stickiness at the exposed area, and then contacting powder particles with the thin layer after exposure to make the thin layer to accept the powder particles according to the powder acceptability of the thin layer. According to this process, for example, the phosphor screen of a color picture tube can simply be produced.

Process for forming patternwise coated powder layer

A strongly fixed patternwise coated powder layer is formed on a substrate by subjecting a thin layer of photo-sensitive composition containing an aromatic diazonium salt as a photo-sensitive component capable of becoming sticky due to the formation of a photolytic reaction product of the salt by a patternwise light exposure, thereby making the light-exposed part of the thin layer sticky, bringing the thin layer in contact with powdery grains, thereby forming a powder-containing coating layer, and contacting the powder-containing coating layer with a powdery material that reacts with the photolytic product, thereby forming a water-insoluble or slightly water-soluble solid material to fix the powdery grains to the substrate.

Growing community of inventors

Tokyo, Japan

Hajime Morishita