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1. 发明专利

JPH04197651A LONG PRINTER 失效
公开(公告)号：JPH04197651A
公开(公告)日：1992-07-17
申请号：JP33256390
申请日：1990-11-28
申请人： RICOH KK
发明人： FUJITA KENJI
IPC分类号： B41J2/345
摘要： PURPOSE:To prevent printing inferiority from occurrence even when a difference in level exists at a joining part of short thermal heads by a method wherein a same printing data is applied to both short thermal heads for a same printing line at an overlapped part of a heating element arrangement. CONSTITUTION:If such a difference in level that, for instance, a short thermal head 2-3 becomes higher than a short thermal head 2-2 occurs at a joining part, though a thermal medium is pushed sufficiently onto a heating element of the short thermal head 2-3 with a platen roller 12, it is not sufficiently pushed onto a heating element of the short thermal head 2-2 and enough contact into the heating element of the short thermal head 2-2 can not be provided. Then, printing is performed with heating elements 8a1 to 8an for an overlapped part and is not performed with heating elements 8b1 to 8bn. Since a same printing data is supplied to a same line for the overlapped part in this case, even though printing is not performed on one side, printing for the overlapped part is normally carried out.

2. 发明专利

JPS63176163A THERMAL HEAD 失效
公开(公告)号：JPS63176163A
公开(公告)日：1988-07-20
申请号：JP870487
申请日：1987-01-16
申请人： RICOH KK
发明人： FUJITA KENJI , KASAI IKUO , SAWARA NOBUYUKI , HATTORI TAKASHI
IPC分类号： B41J2/36 , B41J2/35
摘要： PURPOSE:To improve the printing quality of a thermal head, by making the number of heating elements being controlled through respective print signals uneven thereby suppressing uneven printing density caused by voltage drop of a common electrode or warping of the thermal head. CONSTITUTION:Upto third printing signals SB1-SB3 from the left end control five driving IC's respectively, while printing signals SB4, SB5 control four driving IC's respectively and printing signals SB6-SB8 control three driving IC's respectively. Consequently, level of current flowing through a common electrode decreases as the distance from the power supply source increases, and the voltage drop in the common electrode does not increase remarkably even if the distance from the power supply side increases. If a thermal head 32 is warped in a projecting shape, number of heating elements in the central portion is increased to reduce quantity of heat to be produced from a single heating element while the number of heating elements is decreased at the opposite ends to increase the quantity of heat to be produced from a single element.

3. 发明专利

JPH05193180A THERMAL RECORDING APPARATUS 失效
公开(公告)号：JPH05193180A
公开(公告)日：1993-08-03
申请号：JP3022492
申请日：1992-01-20
申请人： RICOH KK
发明人： FUJITA KENJI
IPC分类号： B41J2/365 , B41J29/00
摘要： PURPOSE:To provide the above thermal recording apparatus capable of obtaining image density of high accuracy and high gradation properties. CONSTITUTION:The temps. of a thermal head 1 and a platen 2 are respectively detected by first and second thermistors 3, 4. The detected temps. are converted to digital signals by a pulse width correction part and the pulse widths corresponding to both digital values are calculated from a pulse width table 6 to be supplied to a thermal head driving part 7 which in turn drives the thermal head 1 so as to apply the supplied pulse widths.

4. 发明专利

JPH04211968A LONG-TYPE PRINTER 失效
公开(公告)号：JPH04211968A
公开(公告)日：1992-08-03
申请号：JP5832091
申请日：1991-02-27
申请人： RICOH KK
发明人： FUKUMORI KAZUNARI , FUJITA KENJI , ASAYAMA HAJIME
IPC分类号： B41J2/345
摘要： PURPOSE:To simplify a structure by a method wherein a long-type printer is composed by arranging a plurality of short thermal heads or short heating substrates per se, and a printing is performed by a single platen roller. CONSTITUTION:Supply-side thermal heads 2-1, 2-3,... and discharge-side thermal heads 2-2, 2-4,... are alternately fixed on a fixing board 4 with screws or the like so that the end faces of substrate end parts provided with heating elements thereon are opposed to each other. At the joint part of the supply-side thermal head and the discharge-side thermal head adjacent to each other, the heads are overlapped so that heating element alignments 8 are not overlapped with each other in a recording paper running direction.

5. 发明专利

JPH03136881A THERMAL TRANSFER PRINTING APPARATUS 失效
公开(公告)号：JPH03136881A
公开(公告)日：1991-06-11
申请号：JP2341090
申请日：1990-01-31
申请人： RICOH KK
发明人： YOSHIMIZU TOSHIKAZU , FUJITA KENJI , SEIGENJI TAKASHI
IPC分类号： B41J15/04 , B41J2/325 , B41J29/00
摘要： PURPOSE:To realize different printing modes by one apparatus by making the direction to draw out a transfer medium changeable thereby to change the time since a heat generating body heats the transfer medium until the transfer medium is separated from a medium to be transferred. CONSTITUTION:In printing in the dull-finished mat mode, a roller 24 is positioned downward, so that the drawing angle of a transfer medium 6 after transfer becomes in a direction of -theta to the forming surface head substrate. Accordingly, while a heated ink layer 6c is cooled and hardened, the ink layer 6c is separated before it is completely hardened. Therefore, a hardened part and a part not yet hardened are mixed in the ink layer 6c. That is, the surface of the ink layer transferred to a medium 8 to the transferred becomes rough. On the other hand, in printing in the flint-glazed mode, the roller 24 is moved and positioned upward, so that the drawing angle of the transfer medium 6 after printing is directed in a direction of +theta to the surface where the heat generating body is formed in the thermal head substrate.

6. 发明专利

JPH05107737A EXPOSURE DEVICE AND MASK FILM 失效
公开(公告)号：JPH05107737A
公开(公告)日：1993-04-30
申请号：JP29991691
申请日：1991-10-18
申请人： RICOH KK
发明人： FUJITA KENJI
IPC分类号： G03F1/00 , G03F1/68 , G03F7/20 , H05K3/00
摘要： PURPOSE:To facilitate the formation and replacement of a mask on the exposure device. CONSTITUTION:A mask film 2 which has a recording layer where an optical pattern can thermally be recorded is wound between a couple of capstan rollers 4a and 4b and pressed while held between a thermal print head 6 and a platen roller 8. The mask film 2 is conveyed in a direction A or B by the rotation of the capstan rollers 4a and 4b and platen roller 8. When the mask film 2 is conveyed in the direction A, a mask pattern is written on the mask film 2 by the thermal print head 6 corresponding to image information. A work 10 is installed at a light irradiation position on one side of the mask film 2 and exposed to the light from a lamp house 12 on the opposite side through the mask pattern of the mask film 2.

7. 发明专利

JPH04197648A LONG PRINTER 失效
公开(公告)号：JPH04197648A
公开(公告)日：1992-07-17
申请号：JP33256290
申请日：1990-11-28
申请人： RICOH KK
发明人： FUJITA KENJI
IPC分类号： B41J2/335
摘要： PURPOSE:To improve the printing quality by enabling a recording medium to be brought into good contact on a heating element even though a difference in level exists between adjacent short thermal heads by a method wherein a platen roller part coming in contact with a joining part between the short thermal heads is made to have low hardness. CONSTITUTION:Though a contour of a rubber elastic component 20 enclosing a periphery of a platen roller is cylindrical, a diameter of a roller core 22b of a part B coming contact with a joining part of short thermal heads becomes thinner than a diameter of another part 22a. For instance, though a thickness of the rubber elastic component is about 2mm at a part 20a coming in contact with a part other than the jointing part of the short thermal heads, its thickness is thicker than that at a part 20b coming in contact with the joining part of the short thermal heads. For instance, it becomes about 4 to 6mm. Consequently, a hardness of the platen roller can be made, for instance, 20 to 30 degree for the part B and, for instance, 40 to 50 degree for the other part.

8. 发明专利

JPH0444887A IMAGE DISPLAY 失效
公开(公告)号：JPH0444887A
公开(公告)日：1992-02-14
申请号：JP41223590
申请日：1990-12-19
申请人： RICOH KK
发明人： HOTTA YOSHIHIKO , KONAGAYA YUKIO , MOROHOSHI KUNICHIKA , KAWAGUCHI MAKOTO , MASUBUCHI FUMITO , NOGIWA TORU , KAWAKAMI TOSHIO , FUKUMORI KAZUNARI , FUJITA KENJI
IPC分类号： B41M5/36 , B41M5/26
摘要： PURPOSE:To ensure that a satisfactory image is formed and is deleted easily and precisely using a very small amount of energy and obtain a high contrast image by using a reversible thermal recording material with the width of temperature at which the material becomes transparent exceeding a specific temperature level and also using a thermal head for obtaining a transparent state. CONSTITUTION:A reversible thermal recording material with the width of temperature at which the material becomes tuansparent exceeding 15 deg.C is used and a thermal head is used for obtaining a transparent state. The larger the width of temperature at which transparency is obtained becomes, the easier process of making the material is made transparent. Therefore, the temperature should preferably exceed 15 deg.C. However, if the width is too large, a turbidity temperature goes too high, in other words, thermal sensitivity at which an opaque image is formed decreases. For this reason, the width of temperature at which the material becomes transparent should preferably be below 80 deg.C and further preferably be below 50 deg.C. A required pulse width application time depends on the shape of a thermal head, that it is difficult to conclude the best temperature easily. However, it is recommended that the width be for example, 5 msec or larger and preferably, 5 to 32msec at 15 deg.C to 22 deg.C. To enable the width to be increased to 15 deg.C or larger, the alternative is to make a proper combination of organic low molecular substances or to combine such a substance with any other material with a different melting point.

9. 发明专利

JPH0347774A THERMAL TRANSFER PRINTER 失效
公开(公告)号：JPH0347774A
公开(公告)日：1991-02-28
申请号：JP18300489
申请日：1989-07-14
申请人： RICOH KK
发明人： YOSHIMIZU TOSHIKAZU , FUJITA KENJI
IPC分类号： B41J2/32 , B41J2/325 , B41J17/38
摘要： PURPOSE:To enhance a transfer coefficient by a method wherein heating elements are arranged in proximity of the end of a substrate, and a transfer medium is released from a medium subjected to transfer at the end part of the substrate on which the heating elements are arranged. CONSTITUTION:Heating elements 22 are formed in proximity to an end part 20a on a main surface of a substrate of a thermal head 20. In transferring, a transfer medium 6 and a medium to be subjected to transfer 8 are overlapped with each other and depressed on the heating elements 22 by a platen 4. The surface of a substrate 24 is covered with a glass glaze layer 26, and thereon a resistor layer 28 and an electrode layer 30 are successively formed. In this manner, the heating elements 22 and electrodes 30a, 30b are formed. The electrode 30a serving as a common electrode and the electrode 30b serving as a selective electrode are coated with a protective film 32. The substrate end part 20a is provided with a chamfered part 20b. A favorable transfer coefficient can be obtained when a distance D from the ends of the heating elements 22 to the substrate end 20a is 500mum or less.

10. 发明专利

JPS6395961A MANUFACTURE OF THIN-FILM THERMAL HEAD 失效
公开(公告)号：JPS6395961A
公开(公告)日：1988-04-26
申请号：JP24230586
申请日：1986-10-13
申请人： RICOH KK
发明人： HATTORI TAKASHI , YAMAGUCHI TAKAYUKI , FUJITA KENJI , KAMEDA KOJI
IPC分类号： B41J2/335
摘要： PURPOSE:To reduce the cost of a lithographic process, by a method wherein when an electrode mask for an elongate thermal head is for a positive-type resist, exposure to light is conducted by fitting a belt-shaped light-shielding member in a direction orthogonal to the longitudinal direction of the head. CONSTITUTION:When electrodes are provided by using a mask 2 fitted with light-shielding members 26, 28, the parts at which the members 26, 28 are provided become common electrodes in addition to a common electrode part 6. When the elongate thermal head thus obtained is cut at predetermined positions, a short thermal head can be obtained which is provided with common electrodes 30, 32 extending at both end parts of a common electrode 12 from an edge on the side of the common electrode to an edge on the side of selecting electrodes. When assembly with this short thermal head is performed, the connection between a printed circuit board 20 and the common electrode 12 can be performed through soldering wires 22, 23 in a protective cover 18 by using the common electrodes 30, 32.

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