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1. 发明专利

JPH04119860A THERMOSENSITIVE RECORDING HEAD AND MANUFACTURING METHOD THEREFOR 失效
公开(公告)号：JPH04119860A
公开(公告)日：1992-04-21
申请号：JP24028790
申请日：1990-09-11
申请人： HITACHI LTD
发明人： OBATA SHIGERU , WATANABE MICHIHIRO , SATOU KAZUYASU , ATO KAZUHIKO
IPC分类号： B41J2/335 , B41J2/345
摘要： PURPOSE:To eliminate nonuniformity of density in printing derived from unevenness of resistance values by a method wherein heating bodies for each of pixels are made up of two element resistance bodies, wiring for common electrodes is made in a twofold structure, one of which is for common electrodes on odd-number side and another is for common electrodes on even-number side, and each of the common electrodes are connected one another after adjustment is made to the resistance values of all of the element resistance bodies. CONSTITUTION:In formation of common electrodes in two layers with a part of an insulating membrane 5 cut out, common electrodes 1a on odd-number sides are connected to a side common wiring 4a with common electrodes 1b on even-number sides made independent of a side common wiring 4b, and an electrode pattern is formed on the lower layer. The insulating membrane 5 is then formed in a width not interfering with individual electrodes 2 in the direction of main scanning. Then cut-out parts are formed on the insulating membrane 5 so that projecting parts thereof facing a resistance body 3 cover over the common electrodes la. An electric conductive membrane 6 is formed further so that it runs over the parts projecting toward the resistance body 3 of the insulating membrane 5, and bridges each of the common electrodes 1b on the even-number sides, and thereby each of the common electrodes 1b is connected with a side common wiring 4b. Then resistance body 3 is formed. Each of element resistance bodies located between individual electrodes 2 and the common electrodes 1a, 1b is electrified, and thereby adjustment is made to resistance values of the element resistance bodies.

2. 发明专利

JPH03286889A THERMAL HEAD DEVICE 失效
公开(公告)号：JPH03286889A
公开(公告)日：1991-12-17
申请号：JP8812590
申请日：1990-04-04
申请人： HITACHI LTD
发明人： HIDA HIROYUKI , ATO KAZUHIKO , TAJIRI YOJI
IPC分类号： B41J25/312 , B41J2/32 , B41J2/325 , B41J17/30 , B41J25/316
摘要： PURPOSE:To lighten steeply frictional resistance by a method wherein a contact preventive means is provided which does not bring an edge side on a downstream side in an ink film carrying direction of a ceramic substrate into practical contact with an ink film. CONSTITUTION:A small diameter roller 9 is so provided as to come into contact with an ink film 4 near an edge side on a downstream side in an ink film carrying direction of a ceramic substrate 7, and the roller 9 is held freely rotatively with a radiation shield by a simple journal mechanism. The roller 9 is so fitted as to protrude very minutely to a platen 1 side from a heating element forming surface of the ceramic substrate 7. Thereby, an edge side corner part 7a on the downstream side in the ink film carrying direction of the ceramic substrate 7 does not bring into practical contact with the ink film 4. Since the roller 9 is rotated following transfer of the ink film 4 on the downstream side in the ink film carrying direction of a thermal head assembly 5, frictional resistance on the downstream side in the ink film carrying direction of the thermal head assembly 5 is steeply reduced compared with conventional one.

3. 发明专利

JPH03175058A THICK FILM TYPE THERMAL RECORDING HEAD AND RECORDER 失效
公开(公告)号：JPH03175058A
公开(公告)日：1991-07-30
申请号：JP21701490
申请日：1990-08-20
申请人： HITACHI LTD
发明人： KIYONO TASAKU , WATANABE MICHIHIRO , ZEN MUNETOSHI , SATOU KAZUYASU , OBATA SHIGERU , ARAI MAYA , ATO KAZUHIKO , HANMA KENTARO
IPC分类号： B41J2/335 , B41J2/345
摘要： PURPOSE:To obtain a smooth photographic printed image by uniforming distribution of tempera ture in each pixel on the surface of a thermal recording head by a method wherein a protec tive layer of a thick film type thermal head is made to be a two layer structure of an electric insulating protective layer and a thermal diffusion film. CONSTITUTION:A partial glazed layer 2 being a thermal resistant layer, an electrode 3 and further a thick film resistor 4 are successively laminated on an alumina substrate 1. Further, an insulating protective layer 5 is formed and a metallic layer 6 as a thermal diffusion film (a high thermal conductive layer) is, in a beltlike manner, formed thereon so as to be located above the thick film resistor 4. The metallic film 6 is formed as follows. Paste of adding glass particles and organic binder to 88-99 wt % of, for instance, gold, silver, or copper is printed with a screen printer, is dried, and is burnt so that a pattern width in the subscan direction becomes 50-150 % of the width of a thermal resistor. Further, a surface protective layer 7 the surface of which is smooth and which has glass having conductivity as a main component is formed as an uppermost layer to construct a thermal head. Since the metallic film 6 is high in thermal conductivity, heat is diffused in the inward direction of the surface, and heat generated in the resistor 4 is, in a uniform distribution manner, conducted to the surface of the surface protective layer 7. Then, a smooth image can be outputted.

4. 发明专利

JPH03106667A HEATING HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH03106667A
公开(公告)日：1991-05-07
申请号：JP24485489
申请日：1989-09-20
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： HONDA TATSUO , TSUMURA MAKOTO , SUZUKI YASUAKI , ITO TADASHI , ATO KAZUHIKO
IPC分类号： B41J2/345
摘要： PURPOSE:To make it possible to apply processing even to a narrow space between electrodes with a high degree of precision by cutting off irregularities, in width direction, of resistor due to the limit of printing accuracy by applying laser beam etc., after the printing of resistance paste and before burning. CONSTITUTION:Separate electrodes 3 and a common electrode 4 are disposed on an insulated substrate 1 and heat storing layer 2, and resistance paste is applied thereto in a main scanning direction by screen printing. Thereafter, in order to remove diluents having been added to allow smooth coating in printing, said paste is dried at about 150 deg.C. And before burning, laser beam is applied to part of resistor 5 along the main scanning direction of recording to cut off excessive resistor 6 protruding on both sides in the width direction. In this manner, a resistor 5 provided with precise picture element and resistance value can be formed. Energy of the laser beam applied in this case is about 1/5 or less of energy required for cutting after burning, hence damage to the electrodes 3 and 4 is negligible and influence on resistance values of resistor due to laser processing can be neglected.

5. 发明专利

JPH0272969A THICK-FILM TYPE THERMAL RECORDING HEAD 失效
公开(公告)号：JPH0272969A
公开(公告)日：1990-03-13
申请号：JP22465988
申请日：1988-09-09
申请人： HITACHI LTD
发明人： SATOU KAZUYASU , WATANABE MICHIHIRO , ZEN MUNETOSHI , OBATA SHIGERU , ATO KAZUHIKO
IPC分类号： B41J2/335 , B41J2/345 , B41J2/35 , B41J2/355
摘要： PURPOSE:To bring all of the resistance values of two resistor elements forming a picture element to the same value by fixing the resistance values of separate resistor element held by alternately led-out electrodes by applying pulse-shaped voltage and connecting ones of the electrodes. CONSTITUTION:An electrode pattern is shaped, a resistor film 6 is formed onto alternately led-out electrodes through printing and baking, and a protective film mainly comprising SiO2.PbO is shaped through printing and baking. The resistance value of a resistor element 6 held by the electrode 1a and the electrode 2a is measured, the rate of change of the resistance value for changing the resistance value into an aimed resistance value is computed, and corresponding applied pulse voltage is acquired. When pulses having the voltage are applied between the electrode 1a and the electrode 2a, the resistance value of the resistor element 6a is turned into the target value. The resistance value of the next resistor element 6b held by the electrode 1a and the electrode 2a is adjusted, thus trimming the resistance values of all resistor elements at the target value.

6. 发明专利

JPH0270457A THERMAL HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH0270457A
公开(公告)日：1990-03-09
申请号：JP22238288
申请日：1988-09-07
申请人： HITACHI LTD
发明人： SUZUKI YASUAKI , TSUMURA MAKOTO , KITA YOSHIAKI , KANEKO TOSHITERU , ATO KAZUHIKO
IPC分类号： B41J2/335 , B41J2/345
摘要： PURPOSE:To reduce cost, and to improve picture quality by forming only a resistor through a thin-film system during a head manufacturing process through a thick-film system. CONSTITUTION:Electrodes 2, 3 composed of gold Au are shaped onto a partial glaze 6 formed onto a substrate 5 through printing by a thick-film system. A material such as a Cr layer 4 for separating the electrodes 2, 3 and a resistor 1 so that the material Au of the electrodes 2, 3 and the material such as Cr- Si-SiO2 of the resistor 1 are not diffused and eutectic points thereof are not lowered is shaped onto the electrodes 2, 3 through sputtering, and left only near the electrode 2, 3 sections through a photo-resist process. The resistor 1 is sputtered, a film is formed through the photo-resist process, and a protective layer for protection is baked. The resistor 1 is formed to an irregular shape sectionally because of a thin-film, but the distribution of a resistance value is equalized, thus improving picture quality.

7. 发明专利

JPH022026A THERMAL RECORDING HEAD AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH022026A
公开(公告)日：1990-01-08
申请号：JP14365188
申请日：1988-06-13
申请人： HITACHI LTD
发明人： HATTORI OSAMU , GOTO TOSHIHIKO , HANMA KENTARO , ATO KAZUHIKO
IPC分类号： B41J2/335
摘要： PURPOSE:To obtain a thermal recording head reduced in power to be applied and generating no damage of an electrode part and a heat generating part by flattening the upper surface of the heat generating part to position the same above the upper surface of the electrode part. CONSTITUTION:In a thermal head, an electrode part 51 is constituted of an electrode film 18 and the protective film 20 on the electrode film 18 while a heat generating part 21 is constituted of a heat generating resistor 19 and the protective film 20 on said heat generating resistor 19. The upper surface of the heat generating part 21 is flat and the diameter of a drum 22, around which recording paper 26 consisting of printing paper 23 and ink paper 24 is wound, is far larger than the length (l) of said upper surface and, therefore, the contact of the heat generating part 21 with the recording paper 26 is regarded as plane-to-plane contact and, even when the rigidity of the recording paper 26 is high and hard to deform, almost uniform contact pressure is obtained over the total length of the heat generating part 21. Therefore, an image print of high image quality can be obtained and, since the contact pressure with the recording paper does not become excessive locally, there is no possibility damaging the electrode part and the heat generating part and, further, since the electrode part is not brought into contact with the recording paper, the power applied to the head is reduced.

8. 发明专利

JPS6456568A METHOD AND APPARATUS FOR MANUFACTURING THICK FILM TYPE THERMAL RECORDING HEAD 失效
公开(公告)号：JPS6456568A
公开(公告)日：1989-03-03
申请号：JP21277087
申请日：1987-08-28
申请人： HITACHI LTD
发明人： ZEN MUNETOSHI , WATANABE MICHIHIRO , SATOU KAZUYASU , OBATA SHIGERU , ATO KAZUHIKO
IPC分类号： B41J2/335
摘要： PURPOSE:To eliminate ununiformity of density, reduce scatter of resistance values and attain higher image quality, by simultaneously polishing all sections in a main scanning direction of contact by rotating a polishing roller, and polishing a curved surface by oscillating a substrate to the left and right sides in an auxiliary scanning direction. CONSTITUTION:To polish a heat generating resistor 15 in a polishing step, a substrate 2 fired after providing the resistor 15 is fixed to a vacuum chuck 5, and is accurately set on the lower side of a polishing roller 1 in parallel to the roller 1. A fixed load is applied to the substrate 2 by an applying part 4 through a load sensor 3. The surface of the resistor 15 is polished as one body by rotating the roller 1. Push-up pins 10a, 10b lifting the vacuum chuck 5 are alternately swung to stoppers 11a, 11b by a swinging mechanism 8 and a cylinder 9, whereby the resistor 15 is polished to have a smooth curved surface. Thus, adjustment of resistance and reduction of scatter of resistance are simultaneously performed, and the surface of the resistor 15 is finished to a smooth curved surface having a surface roughness of not more than + or -1mum. A protective film is also treated in the same manner.

9. 发明专利

JPS63159065A RESISTOR FOR THERMAL RECORDING HEAD 失效
公开(公告)号：JPS63159065A
公开(公告)日：1988-07-01
申请号：JP30641186
申请日：1986-12-24
申请人： HITACHI LTD
发明人： ATO KAZUHIKO
IPC分类号： B41J2/335
摘要： PURPOSE:To effectively transfer the heat generated by a resistor to a printing paper and contrive enhancement of thermal efficiency of a thermal recording head, by providing an insulating film beneath a resistor film located amid a pair of conductor films while setting the width of the insulating film to be smaller than the spacing between the conductor films. CONSTITUTION:An insulating layer 5 having a width smaller than the spacing between electrodes 3, 3 is provided on an insulating substrate 1 by screen printing, followed by drying, firing and polishing the surface of the layer 5. A resistor film 2 is provided on the insulating layer 5 by an ordinary method so that end parts thereof adjoining the electrodes are located on the outside of the insulating layer 5 to step a part thereof adjoining the substrate 1. A pair of the electrodes 3, thinner than the insulating layer 5, are provided at a predetermined interval at the end parts of the resistor film 2, and a protective layer 4 is provided thereon. Thus, the heat generated by a resistor can be transferred to a printing surface without obstruction by the electrode parts, and thermal efficiency is greatly enhanced. In addition, the shape of a printed dot is the same as that of a heat generating resistor, and printing quality is enhanced.

10. 发明专利

JPS62133702A RESISTOR FOR THERMAL RECORDING HEAD 失效
公开(公告)号：JPS62133702A
公开(公告)日：1987-06-16
申请号：JP27321785
申请日：1985-12-06
申请人： HITACHI LTD
发明人： ATO KAZUHIKO , TOBIKADO HIROYUKI
IPC分类号： G06K15/00 , B41J2/335 , B41J2/345 , H01C17/24

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