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1. 发明专利

JPH01146765A DRIVE SYSTEM OF THERMAL HEAD 失效
公开(公告)号：JPH01146765A
公开(公告)日：1989-06-08
申请号：JP30324787
申请日：1987-12-02
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/365
摘要： PURPOSE:To reduce a change in dot diameter, by a method wherein, the temperature of a thermal head is detected, and according to the detected temperature the drive mode in which the thermal head is divided into blocks to be driven is varied. CONSTITUTION:A thermal head 11 is divided into blocks 12a, 12b... to conduct printing in division and drive conditions for various modes, such as a division mode, e.g. wherein a number of heating elements simultaneously conduct printing together, and a division mode wherein the heating elements are divided into a few number of groups to conduct printing. These division conditions are set into a division condition setting device 14. On the other hand, corresponding to the temperature of the thermal head 11 detected by a temperature detection device 13 disposed on the thermal head 11, the division condition is changed. If the temperature of the thermal head is low, the division mode wherein the heating elements of the thermal head 11 simultaneously conduct printing together is selected; if high, the division mode wherein the heating elements are divided into a few number of groups to conduct printing is selected. In this manner, even if a heat accumulation phenomenon occurs in the heating elements of the thermal head, the thermal head is prevented from temperature change, and the diameter of a recording dot can be held substantially constant.

2. 发明专利

JPH01146746A RECORDING SYSTEM OF COLOR PRINTER 失效
公开(公告)号：JPH01146746A
公开(公告)日：1989-06-08
申请号：JP30324987
申请日：1987-12-02
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/525
摘要： PURPOSE:To take-in a large number of gradations without lowering resolving power, by separately setting the matrix sizes of the primary colors corresponding to the visual sensitivity of a person and driving a printer on the basis of this pixel matrix size. CONSTITUTION:When the visual sensitivity characteristic of a person is investigated with respect to the primary colors Y(Yellow), M(magenta) and C(cyan), the sensitivity is highest is M and low in Y and C. Hereupon, with respect to M highest in sensitivity, great importance is attached to resolving power in determining a matrix size to set a matrix size determined by 7 pixels/mm being the tolerance limit of the resolving power of a human's eye and a 4X4 matrix 16 is obtained. With respect to Y and C low in sensitivity, great importance is attached to the number of gradations rather than the resolving power in the determination of the matrix size and a 5X5 matrix 17 is obtained. On the basis of the matrix size of each of the primary colors set as mentioned above by a setting means 11, a color image 10 is printed by a printer driving apparatus 12.

3. 发明专利

JPH01188351A INK JET NOZZLE FOR PRINTER 失效
公开(公告)号：JPH01188351A
公开(公告)日：1989-07-27
申请号：JP1088488
申请日：1988-01-22
申请人： FUJITSU LTD
发明人： NAKAZAWA AKIRA , OZAKI MITSUO , KIYOTA KOHEI , MIKAMI TOMOHISA , EBINAKA TOSHIO , NAKA TOSHIYA , MOROO JUN , NAKAMURA SEIKICHI , TAKADA NOBORU
IPC分类号： B41J2/015 , B41J2/06 , B41J2/49
摘要： PURPOSE:To give powerful jet energy to ink and thereby perform high-quality printing on a recording medium by donating to ink droplets the energy to cause said droplets to be sent flying by using a magnetic field generation means. CONSTITUTION:A magnet 14 with a core 12 and a coil 13 wound up by the former is provided as a magnet generation means in front of the jet nozzle 11a of a nozzle 11, and the coil 13 of superconducting material generates a powerful magnetic field. If a pulsed current is applied to the coil 13, a magnetic field generates accordingly around the magnet 14 to allow magnetic ink 15 provided in the internal space of the nozzle 11 to be attracted through a jet nozzle 11a by the magnetic field of the magnet 14. This attracted ink is sent flying forward by a surface tension in the form of cubic ink droplets. If a recording medium 16 such as paper is allowed to intervene between the nozzle 11 and the magnet 14, the ink droplets collide on the medium 16 to provide desired recording.

4. 发明专利

JPS6463168A THERMAL HEAD DRIVING SYSTEM 失效
公开(公告)号：JPS6463168A
公开(公告)日：1989-03-09
申请号：JP21904587
申请日：1987-09-03
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/355
摘要： PURPOSE:To obtain a good image, by providing a division position setting means which sets division positions of a thermal head discontinuously between two lines. CONSTITUTION:A line thermal head 2 is divided into a plurality of blocks at predetermined positions by a thermal head driver 1. The respective blocks are driven in offset manner timewise. At this time, the thermal head 2 is divided at different positions at every one-line drive of the thermal head 2 by a division position setting means 3. As a result, the discontinuously displayed points due to the crosstalk of heating elements are not recorded continuously on a recording paper, and a good image is obtained.

5. 发明专利

JPS63147667A INTERMEDIATE-TONE THERMAL PRINTER 失效
公开(公告)号：JPS63147667A
公开(公告)日：1988-06-20
申请号：JP29611086
申请日：1986-12-11
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/36
摘要： PURPOSE:To prevent dot shape from being varied according to recorded density, by providing a heat generating element driving signal calculating means for calculating an optimum crest value and an optimum pulse duration according to gradation data, and a heat generating element driving circuit for outputting a signal generated by the calculating means to heat generating elements in synchronism with a recording timing signal. CONSTITUTION:A heat generating element driving signal calculating means 1 generates a signal with a higher pulse crest value and a shorter pulse duration to be applied to a thermal head 2 at the time of a high-density recording, and generates a signal with a lower pulse crest value and a longer pulse duration at the time of low-density recording. Thus, a thermal recording pulse signal is generated which has a pulse crest value and a pulse duration varied according to the gradation of an image to be recorded. A heat generating element driving circuit 3 applies driving pulses having the pulse crest value and the pulse duration outputted from the calculating means 1, to heat generating elements 2. As a result, the heat generating elements 2 are made to generate heat with an optimum pulse crest value and an optimum pulse duration according to the gradation of the image to be recorded, whereby a predetermined density level can be obtained. In addition, a substantially constant dot shape can be maintained at all levels of density.

6. 发明专利

JPH0272971A PREDICTING DEVICE FOR HEAT ACCUMULATION OF THERMAL HEAD 失效
公开(公告)号：JPH0272971A
公开(公告)日：1990-03-13
申请号：JP22353188
申请日：1988-09-08
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , EBINAKA TOSHIO , MIKAMI TOMOHISA
IPC分类号： B41J2/365 , B41J2/36
摘要： PURPOSE:To prevent density displacement under the transient state of a large temperature change by changing over thermal time constants in each cooling constant according to the magnitude of the temperature change and conducting heat-accumulation estimation being close to the observed values of the temperature change to each heating element and having high accuracy. CONSTITUTION:When a changeover-position detecting means 3 detects the position of the changeover of the constant of estimated-temperature arithmetic operation on the basis of the input of a data for recording, the means 3 transmits a changeover signal to a cooling-constant generating means 2. When there is the changeover signal, the cooling-constant generating means 2 transmits the cooling constant exp (-t/tau2) of a novel thermal time constant tau2 to a predicting-temperature arithmetic means 1 in place of the cooling constant of a thermal time constant tau1. Consequently, the thermal time constant included in the cooling constant sent to the estimated-temperature arithmetic means 1 is changed over, thus reducing the difference of a temperature observed value and an estimated one. Accordingly, a number of the thermal time constants are prepared, and compensated, thus eliminating density variation under a transient state.

7. 发明专利

JPS6467363A DRIVING SYSTEM FOR THERMAL HEAD 失效
公开(公告)号：JPS6467363A
公开(公告)日：1989-03-14
申请号：JP22308787
申请日：1987-09-08
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/355 , B41J2/36
摘要： PURPOSE:To make it possible to maintain image quality even when a thermal head is driven divisionally, by providing a thermal head driver with a dividing position setting means for detecting variations in density between adjacent picture elements and determining dividing positions for the thermal head based on the detected variations. CONSTITUTION:A thermal head driver divides a head comprising 1728 picture elements at three positions to form four blocks. A block boundary setting part 12 as a dividing position setting means compares the densities of adjacent picture elements in the vicinity (Mn+ or -100) of three picture elements (Mn=432xn, n=1, 2, 3) in a one-line amount of image data. Then, a position with a large variation in gradation level (a variation of 0.80 D), a low or high gradation level part (a part with at least 1.30 D or not more than 0.30 D), the center of a pattern with a wide low- or high-gradation-level width, and the positions of Mn=432xn are outputted as dividing positions. The boundary setting part 12 uses a microprocessor to perform a process according to software. With this system, discontinuity in indication due to crosstalk among heat generating elements is made inconspicuous, and image quality can thus be made favorable.

8. 发明专利

JPS63170047A MULTI-VALUE THERMAL PRINTER 失效
公开(公告)号：JPS63170047A
公开(公告)日：1988-07-13
申请号：JP249287
申请日：1987-01-07
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： B41J2/36 , B41J2/355
摘要： PURPOSE:To perform stable multi-value recording by utilizing the cross talk of a division driving recording system, by heating the adjacent recording pixel simultaneously with a recording pixel in said system. CONSTITUTION:A line start signal rises at the start time of recording and gradation data is latched by a latch circuit 22. Rom 23 inputs the gradation data to output recording dot driving data and adjacent pixel driving data to a selector 24 corresponding to the gradation data and the selector 24 selects one of the recording dot driving data, adjacent pixel driving data and non- recording data outputted from Rom 23 in each timing to output the same to Rom 25. Rom 25 setting the driving data selected in the selector 24 to an address respectively outputs the thermal head driving pulse width and pulse peak value corresponding to the designated driving data to PPG 26 and a variable power source 27. PPG 26 outputs a transistor driving pulse width to bring a transistor 28 into a continuity state only for a pulse present time.

9. 发明专利

JPS6369380A DENSITY GRADATION TYPE COLOR PRINTER 失效
公开(公告)号：JPS6369380A
公开(公告)日：1988-03-29
申请号：JP21474686
申请日：1986-09-10
申请人： FUJITSU LTD
发明人： NAKA TOSHIYA , MIKAMI TOMOHISA
IPC分类号： G03G15/01 , B41J2/325 , B41J2/525 , B41J3/00 , H04N1/46
摘要： PURPOSE:To obtain excellent picture quality by deciding a density gradation level of a 3-primary color ink of the titled printer so as to divide the achromatic lightness axis uniformly caused in overlapping each color of the same density gradation level of the ink and quantizing the density of each color to one level among the density gradation levels. CONSTITUTION:The density of each color is quantized by using a density level conversion section 2 in a way that the achromatic color obtained by overlapping three colors of the same density level is arranged on the density level of the ink decided to be arranged at a uniform interval on the axis of lightness, that is, to one of the density gradation levels. The difference in the visual characteristic between the density and lightness is corrected by the processing and the quantized noise in terms visuality is minimized. Each quantized density gradation level is converted into a signal representing a pulse width to drive a head by a picture recording section 3 in response to the drive condition of a thermal head and further converted into an output signal having the pulse width.

10. 发明专利

JPH01256197A MAGNETIC SHIELD STRUCTURE USING SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPH01256197A
公开(公告)日：1989-10-12
申请号：JP8308588
申请日：1988-04-06
申请人： FUJITSU LTD
发明人： EBINAKA TOSHIO , MIKAMI TOMOHISA , NAKA TOSHIYA , MOROO JUN , NAKAMURA HIROAKI , ONDA NOBUHIKO , TABATA FUMIO , SEKIGUCHI HIDENORI , KAMATA TORU , SAKATA YUJI , SASAKI YUKIO
IPC分类号： H01L39/00 , H01B12/00 , H05K9/00
摘要： PURPOSE:To prevent magnetic damage by enclosing a field generator located in a protection object or thereabout with a superconductive material layer and by shielding magnetically inside and outside the enclosing superconductive material layer completely. CONSTITUTION:Field generators 80, 82 which are located in a protection object 48 or thereabout are enclosed with superconductive material layer 90 by Meissner effect of the superconductive material 90. The inside and the outside of the enclosing superconductive material layer 90 are completely shielded magnetically. For example, if a magnetic card, floppy disk, optical fiber, etc., are enclosed with the superconductive material 90 which exhibits Meissner effect, the external field is completely shielded. Magnetic damage of the protection object or rotatory polarization of transmission light due to magnetic field action can be thereby prevented.

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