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1. 发明专利

DE3530207A1 未知
公开(公告)号：DE3530207A1
公开(公告)日：1986-03-06
申请号：DE3530207
申请日：1985-08-23
申请人： HITACHI LTD , HITACHI KOKI KK , HITACHI SEIKO KK
发明人： YAMADA TAKAHIRO , NAMEKAWA SATOSHI , YOSHINO EIJI , MATSUDA YASUMASA
IPC分类号： B41J2/115 , B41J2/12 , B41J3/04

2. 发明专利

DE3671613D1 未知
公开(公告)号：DE3671613D1
公开(公告)日：1990-07-05
申请号：DE3671613
申请日：1986-03-03
申请人： HITACHI LTD , HITACHI SEIKO KK , HITACHI KOKI KK
发明人： YAMADA TAKAHIRO , NAMEKAWA SATOSHI , YOSHINO EIJI , MATSUDA YASUMASA
IPC分类号： B41J2/07 , B41J2/115 , B41J2/005
摘要： While the excitation voltage (Ve) of an ink jet nozzle is swept on the logarithmic scale, the generation state of ink droplets at a phase θ k is examined (A). An excitation voltage value Vn generating an ink droplet of small diameter (3) at the phase θ k , an excitation voltage value Vn generating an ink droplet of large diameter (2) at the phase θ k , which is lower than vn, and an excitation voltage value Vn + generating on ink droplet of large diameter at the phase θ k , which is higher than vn are stored (B). Difference values expressed asare derived on the logarithmic scale. Then the nozzle excitation voltage is set at such a value as to generate ink droplets and minimize the value of | Wn - wn |.

3. 发明专利

JPS61280943A INK JET RECORDER 失效
公开(公告)号：JPS61280943A
公开(公告)日：1986-12-11
申请号：JP12246985
申请日：1985-06-07
申请人： HITACHI LTD , HITACHI KOKI KK , HITACHI SEIKO KK
发明人： YAMADA TAKEHIRO , YOSHINO EIJI , MATSUDA YASUMASA
IPC分类号： B41J2/115
摘要： PURPOSE:To permit good recording all the time even when the properties of ink and ambient temperature of recorder are changed as well as enable small and large-diameter ink particles to be exactly controlled with respect to charge by recording signals by a method in which both of small-diameter ink particles and large-diameter ink particles are generated by a given phase difference. CONSTITUTION:The exciting voltage of a nozzle 1 is initially set to the minimum value of a sweeping range. The exciting voltage value is then swept on the logalithmic scale by command from a control computer 5. At the same time, a small width of test signals which are in a fixed phase relation with exciting wave forms are formed by a test signal-forming circuit 11 and applied to a control electrode 12a. Sweeping is made from the initial value to a voltage value to be generated when small-diameter ink particles 3 are separated with a phase thetak independently of large-diameter ink particles 2. A phase switching circuit 10 is driven by command from the computer 5, the phase of test signals from the circuit 11 is shifted by pi to investigate whether large-diameter ink particles 2 are separately generated near the phase of thetak+pi. The same operations are repeated to find out an exciting voltage value at which the separating and generating phase of small-diameter ink particles 3 becomes thetak+pi.

4. 发明专利

JPS57138951A APPARATUS FOR PRODUCING INK PARTICLE 失效
公开(公告)号：JPS57138951A
公开(公告)日：1982-08-27
申请号：JP2310281
申请日：1981-02-20
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAKAE MASAJI , TANNO KIYOHIKO , YAMADA TAKEHIRO , MATSUDA YASUMASA , YOSHINO EIJI
IPC分类号： B41J2/02 , B41J2/135
摘要： PURPOSE:To stabilize the generation of ink particles by setting the ratio L/phi between the diameter phi of a nozzle hole and the axial length L thereof at 0.7 or more in an ink particle generator designed to generate F pieces of ink particles per sec employing a fundamental frequency F and an excitation voltage containing a double higher harmonic. CONSTITUTION:An electric-mechanical conversion element 4 is excited by an excitation voltage source 5 adapted to generate an excitation voltage Ve receiving input signals of frequency F and 2F respectively from first and second oscillators 12 and 13, F pieces per sec of ink particles are generated from an ink column injected through a nozzle hole 7 of an orifice plate 3 on a nozzle 1. The generation of the ink particles relates to the frequency component of the excitation voltage Ve and a difference in the phase between the frequencies F and 2F. There is the center phase difference thetac where ink particles are generated most stably. The center phase difference thetac depends on the ratio between the average diameter phi of the nozzle hole 7 and the length L thereof. Where L/phi=0.7 or more, thetac=60 deg..

5. 发明专利

JPS61199958A INK JET RECORDING DEVICE 失效
公开(公告)号：JPS61199958A
公开(公告)日：1986-09-04
申请号：JP4132685
申请日：1985-03-04
申请人： HITACHI LTD , HITACHI KOKI KK , HITACHI SEIKO KK
发明人： YOSHINO EIJI , YAMADA TAKEHIRO , MATSUDA YASUMASA
IPC分类号： B41J2/07 , B41J2/205
摘要： PURPOSE:To enable not only dither method recording, but also density pattern method recording, using a dither method recording circuit, by calling one line recording signals stored in a memory a plural number of times and by constituting them to enable comparison respectively with thresholds within a dither matrix. CONSTITUTION:The constitution is made up with the first signal producing circuit necessary to perform recording of a density pattern method; the second signal producing circuit necessary to perform recording of a dither method and a data selector 23 and a transfer switch 24 necessary for transferring of the density pattern recording and the dither recording. Within the constitution stated above, recording signals of one line stored in shift registers 3-6 are called a plural number of times with the uses of a clock pulse generator 12, a frequency divider 14, a line signal generator 13, a counter 15, a counter 17, a decoder 18, an inverter 19, AND gates 16-20, and etc. in accordance with the connection diagram herewith, and the comparison with respective thresholds in the dither matrix is made feasible.

6. 发明专利

JPS57133081A INK PARTICLE MAKING DEVICE 失效
公开(公告)号：JPS57133081A
公开(公告)日：1982-08-17
申请号：JP1907381
申请日：1981-02-13
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAKAE MASAJI , YAMADA TAKEHIRO , MATSUDA YASUMASA , YOSHINO EIJI
IPC分类号： B41J2/02
摘要： PURPOSE:To make it possible to produce stable and uniform ink particles by setting the frequency of exciting voltage at a specified value in relation to the resonant frequency of liquid in a nozzle in a device to make ink particles by exciting pressurized ink in the nozzle. CONSTITUTION:Pressurized ink 14 supplied to a nozzle 11 is subjected to vibration by the fact that an electromechanical conversion element 12 is applied exciting voltage Ve from an exciting source 13 and excited, and the vibration is transmitted to an ink column 1 to separate ink into ink particles. Here, the fluid resonant frequency fr of the ink 14 in the nozzle 11 is shown by the formula (in the formula C is the velocity of sound in the ink 14, L is the length of the nozzle, and (n) is an integral number over 1). Ink particles 2 with always uniform size are obtained even if nozzles in which spread of manufacture accuracy is found are used by setting the frequency of the exciting voltage V of an electromechanical conversion element 12 that is mounted on a nozzle such as the nozzle 11 at F=fr/2(1-a).

7. 发明专利

JPH11355583A PICTURE SIGNAL PROCESSOR 失效
公开(公告)号：JPH11355583A
公开(公告)日：1999-12-24
申请号：JP15413898
申请日：1998-06-03
申请人： HITACHI LTD , HITACHI KOKI KK , HITACHI INFORMATION TECHNOLOGY
发明人： INUZUKA TATSUKI , ONOSE ATSUSHI , NAKAMURA TOSHIAKI , KITAI TADASHI , OKADA TADASHI , KANDA MASAYUKI , YOSHINO EIJI
IPC分类号： H04N19/423 , G06T1/60 , H04N1/41 , H04N7/24 , H04N19/00 , H04N19/44 , H04N19/85
摘要： PROBLEM TO BE SOLVED: To accelerate data transfer rate and signal processing speed by compressing data by fixed compressibility set in advance thereby suppressing the fluctuation of compression ratio to reduce a memory capacity. SOLUTION: A data compresser 31 executes the compressing operation of data according to an executing sequence generated by a timing control circuit A21 based on a clock signal from a clock A generating circuit 11. At this time, compressing processing is executed according to fixed compression ratio based on a value previously set to a register 106. By fixing the compression ratio, the time for transferring data can previously be defined, thereby an executing sequence generated by a timing control circuit A21 can also be defined in advance. Thus, the generation of a memory address, the number of transferring data and a transferring timing are definitely generated to efficiently execute signal processing. In addition, the memory quantity of a compressed data memory is also defined in advance to be set with a low capacity.

8. 发明专利

JPS63182153A INK JET RECORDER 失效
公开(公告)号：JPS63182153A
公开(公告)日：1988-07-27
申请号：JP1447787
申请日：1987-01-24
申请人： HITACHI LTD , HITACHI SEIKO KK , HITACHI KOKI KK
发明人： YOSHINO EIJI , YAMADA TAKEHIRO , NISHITANI SHIGEYUKI , MATSUDA YASUMASA
IPC分类号： B41J2/02 , B41J2/205
摘要： PURPOSE:To perform favorable multi-gradational recording by using large and small diameter ink droplets, by operating a means for generating a charging voltage for large diameter ink droplets at the time of recording by use of the large diameter ink droplets, operating a means for generating a chaging voltage for small diameter ink droplets at the time of recording by use of the small diameter ink droplets, and performing switching of an ink droplet generating mode during a non-recording period. CONSTITUTION:A sine wave supplied from a high frequency power source 16 to dropletize an ink through excitation of a nozzle 21 is controlled in voltage by a volume control 17 so as to generate small diameter ink droplets, and is controlled in voltage by a volume control 18 so as to generate large diameter ink droplets. A relay 19 selects either one of a large diameter ink droplet exciting voltage sent from the volume control 18 and a small diameter ink droplet exciting voltage sent from the volume control 17, then the selected voltage is amplied by an OP amplifier 20, and is applied to a piezoelectric element 22. Switching a large diameter ink droplet generating mode to a small diameter ink droplet generating mode or vice versa is set in the period for which a non-recording area is detected by a sensor 25, namely, in a non-recording period in a recording operation.

9. 发明专利

JPS61199959A INK JET RECORDING DEVICE 失效
公开(公告)号：JPS61199959A
公开(公告)日：1986-09-04
申请号：JP4132785
申请日：1985-03-04
申请人： HITACHI LTD , HITACHI KOKI KK , HITACHI SEIKO KK
发明人： YAMADA TAKEHIRO , NAMEKAWA SATOSHI , YOSHINO EIJI , MATSUDA YASUMASA
IPC分类号： B41J2/07 , B41J2/115
摘要： PURPOSE:To permit a reliable charge control of ink droplets of larger diameters and/or smaller diameters respectively with recording signals by obtaining an interval to an excitation voltage of larger diameter ink droplet generation of the lower excitation voltage; and an interval to an excitation voltage of larger diameter ink droplet generation of the higher excitation voltage, and the difference is obtained by calculation, and by setting an excitation voltage in which the above difference is the least. CONSTITUTION:A recording condition effectivation device consists of (1) an excitation voltage variable means A; (2) an ink droplet generation voltage measuring means B; and (3) the most suitable excitation voltage decision means C which seeks the most suitable excitation voltage based on the results of measurement of the means B and sets the voltage. The interval Wn from the number (n) excitation voltage (v)n at which a smaller diameter droplet generates to the excitation voltage Vn at which a larger droplet generates and which is adjacent to and lower than the voltage mentioned first; and the interval Wn to the excitation voltage Vn+1 at which a larger droplet generates and which is higher are obtained and ¦Wn-wn¦ is calculated by a control computation device 5. And, an excitation voltage (v)n at which the value of ¦Wn-Wn¦ is the smallest is sought, and the value is used and set as a nozzle excitation voltage.

10. 发明专利

JPS604065A INK JET RECORDER 失效
公开(公告)号：JPS604065A
公开(公告)日：1985-01-10
申请号：JP11184583
申请日：1983-06-23
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： YOSHINO EIJI , YAMADA TAKEHIRO , SAKAE MASAJI
IPC分类号： B41J2/02 , B41J2/115 , B41J3/04
摘要： PURPOSE:To obtain steady recording by surely charging small size particle, by a method wherein the generating zone of small size particle is detected in a broad range and the phase adjustment of separation timing of small size particle and of charge signal to small size particle is accurately carried out. CONSTITUTION:When the amplitude of exciting voltage (e) of high frequency power source 3 is changed, the generating mode of ink particle and the length lP of ink column 9 are changed. When the exciting voltage (e) is increased, the length lP of ink column 9 is shortened and the generation mode of ink particle is changed (a)-(d). The separation of small size particle 10 from ink column 9 i synchronized with the frequency of excitation voltage (e) of piezoelectric element 4 and the phase theta of its separation timing is changed by excitation voltage (e) and can be regulated within a range of 0-2pi in this excitation frequency. Thereby, the excitation voltage is regulated and the excitation intensity to the ink injected from nozzle is regulated. Therefore, by sure generation of small size particle 10 and by the sure conformance of information signal and separation timing from small size particle 10, steady sure recording by small size particle can be carried out.

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