JPH01208185A - Printer - Google Patents

Abstract

PURPOSE:To enable a printing without using a small-sized thermal head, by a method wherein a thermal recording is conducted on a recording paper using an optically isomerised polymer for a wall material of a capsule containing a coupler reacting with a diazonium salt. CONSTITUTION:Light irradiation of a recording paper causes a change in the steric conformation, ion-dissociation, etc., of an optically isomerized polymer as a capsule wall material, thus imparting a permeability to substance to a capsule wall 3 and emitting a coupler 1. By being successively heated, the light- irradiated part forms a color by the reaction of the coupler 1 with a diazonium salt 4 to produce an azo dye 8. However, an unirradiated part has no possibility of forming a color because the coupler 1 has not been emitted from a capsule. Succeedingly, the diazonium salt 4 is decomposed by an ultraviolet light irradiation to be fixed. In this manner, the need for heating the surface per dot by a small-size thermal head is eliminated, a heat roller etc., for heating all over the surface is made available, and an action to heat around a recording part is not needed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thermal printing device.

[Conventional technology]

Conventional thermal printing equipment uses leuco dyes and solid acids, or
A recording paper in which diazonicum salt, coupler, and a basic compound are dispersed in a resin and coated on a support is used. When recording paper using a diazonium salt is heated with a thermal head, the diazonium salt and the coupler react to form an azo dye, forming a recorded image. Subsequently, the unreacted diazonium salt is decomposed and fixed by UV irradiation.

[Problem to be solved by the invention]

However, with the above-mentioned conventional technology, it is necessary to downsize the thermal head in order to increase the resolution of the recorded image, and there are problems such as installing the heater on the small head and taking measures against heat around the recording section. .

[Means to solve the problem]

The printing apparatus of the present invention is characterized in that a recording paper (recording medium) using a photoisomerizable polymer is used as a wall material of a capsule containing a coupler that reacts with a diazonium salt.

[Effect]

According to the above-mentioned groove formation of the present invention, an image is formed on the recording paper by light irradiation, and color development is performed by subsequent heating.

Furthermore, it is fixed by strong exposure to ultraviolet rays. When the recording paper is irradiated with light, changes such as conformation and ion dissociation of the photoisomerized polymer of the capsule wall material occur, allowing the substance to pass through the capsule wall and releasing the coupler. Subsequently, by heating, the coupler and the diazonium salt react with each other in the light irradiated area to form an azo dye and develop color. In the light-irradiated area, the coupler is not released from the capsule and no color develops. Subsequently, the diazonium salt is decomposed and fixed by ultraviolet irradiation. Therefore, it is not necessary to heat each dot individually using a small thermal head, and a heat roller or the like that heats the entire surface can be used, and there is no need to take heat measures around the recording section.

〔Example〕

FIG. 1 is a sectional view of a recording paper in an embodiment of the present invention. 1 is a coupler that reacts with diazonium salts, and phenol, diphenol, aminobenzene, diazi/benzene, hydrosinaphthalene, and derivatives thereof can be used. 2 is a capsule internal liquid, which is a solvent that dissolves the coupler. This includes both aqueous and non-aqueous solvents.

3 is a capsule wall, which is a resin whose substance permeability changes upon irradiation with light. This resin contains a site in its molecule that changes its conformation, ionic dissociation, radical dissociation, cis-trans isomerization, hydrogen transfer, and cyclization sign when exposed to light, and is azobenzene.

Mention may be made of stilbenes, spiropyrans, triphenylmethane and their derivatives. 4 is diazonium salt 4
-N,N'-dialkylaminobenzenediazonium salt, diphenylamine-P-diazonium salt and derivatives thereof, etc. can be used.

5 is a basic substance used to promote the reaction between the coupler and the diazonium salt, and alkylamines, benzylamines, alkylammonium salts, etc. can be used. 6 is a binder resin of capsules, diazonium salt, and basic substance, which is composed of commercially available resins and waxes. 7 is a support for the above-mentioned recording material, and paper, resin film, etc. can be used.

FIG. 2 shows a printing process in an embodiment of the present invention.

Humans are written by light irradiation. Light irradiation increases the substance permeability of the capsule wall of No. 5. Due to B, the coupler inside the capsule is released and spread outside the capsule together with the liquid inside the capsule. In step C, the entire surface of the recording paper is heated to cause the coupler and diazonium salt to react to form the azo dye No. 8 and development.

In D, unreacted diazonium salt is decomposed and fixed by strong exposure to ultraviolet light.

FIG. 5 shows a printing apparatus of the present invention. The recording section 9 is passed through the support roll 10 and wound around the drum 11. The recording paper on the drum is irradiated with light from a laser oscillator 12 to form a latent image. Subsequently, the film is heated and colored using a heat roller 13 for development. Finally, the image is fixed using an ultraviolet lamp 14.

By using the above method and apparatus, it has become possible to form a latent image by irradiation with light and then perform color development and printing by subsequent heating.

〔Effect of the invention〕

As mentioned above, according to the invention, thermal recording is performed using a recording paper using a photoisomerizable polymer as the wall material of a capsule containing a coupler that reacts with a diazonium salt, and a smaller thermal head is used. It is now possible to print without

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the recording paper of the present invention. 1...Coupler 2...Capsule internal liquid 3...Capsule wall 4...Diazonium salt 5. ......Basic substance 6...Binder resin 7...Support Figure 2 (A) to (D) are marks in the present invention. Al11J process diagram. 8...Azo dye Figure 3 is a diagram of the printing apparatus of the present invention. 9... Recording paper 10... Support roll 11... Drum 12... Laser oscillator 13... Heat roller 14...・・Ultraviolet lamp α ・・・・・ Recording paper feeding direction b ・・・・・Drum rotation direction and above Applicant Seiko Epson Corporation Mewa Jowa Japan Figure 1 Shishozai No. 2shi1 Figure 3

Claims (1)

[Claims] A printing device that performs heat-sensitive recording, characterized in that a recording paper using a photoisomerizable polymer is used as a wall material of a capsule containing a coupler that reacts with a diazonium salt.