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21. 发明专利

JPS61175656A OUTPUT CONTROLLER OF SEMICONDUCTOR LASER 失效
公开(公告)号：JPS61175656A
公开(公告)日：1986-08-07
申请号：JP1601085
申请日：1985-01-30
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , SHIBATA ISAMU
IPC分类号： H01S5/042 , B41J2/44 , G03G15/04 , G03G15/043 , G06K15/12 , H01S5/06 , H01S5/0683 , H04N1/23
摘要： PURPOSE:To prevent a photosensitive body from deteriorating owing to the power setting of a semiconductor laser, to lower the frequency of clock pulses to a counter, and to reduce the cost by inhibiting the power of the semiconductor laser from being set during the scanning of the photosensitive body. CONSTITUTION:The counted value of the up/down counter 13 increases gradually and then the intensity of a laser beam from the semiconductor laser 1 increases gradually, so that the output voltage VM of an amplifier 11 rises. While the photosensitive body scans, a non-photosensitive body scan signal is ceased and an AND circuit 18 turns off to disable the up/down counter 18; when the photosensitive body scans while the semiconductor laser 1 is in a stand-by state, the semiconductor laser is not driven and its power setting is interrupted if incomplete. When the non-photosensitive body is scanned, the power setting of the semiconductor laser 1 is restarted.

22. 发明专利

JPS61174787A SEMICONDUCTOR LASER PROTECTING SYSTEM 失效
公开(公告)号：JPS61174787A
公开(公告)日：1986-08-06
申请号：JP1601385
申请日：1985-01-30
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , SHIBATA ISAMU
IPC分类号： G11B7/125 , G11B7/126 , H01S5/042 , H01S5/068 , H01S5/0683
摘要： PURPOSE:To prevent excessive current to a laser, in a semiconductor laser output control device using a counter, by resetting the counter by turning ON the power source of a laser driving circuit, and cutting OFF the driving current immediately after the turning ON. CONSTITUTION:When a DC power source of +12 V is applied to a laser printer, a reset signal is generated by a reset circuit 19 and applied to an up and down counter 13 and a laser driving circuit 8 through an inverter 20. The counter 13 is reset, and the driving current for a laser 1 is cut OFF. Therefore, even if the logarithmic value of the counter 13 is increased by the cut OFF of + or -12V, the counter 13 is reset when the power is applied again. A large current does not flow to the semiconductor laser 1, and breakdown can be prevented.

23. 发明专利

JPS61174786A OUTPUT ADJUSTING METHOD OF SEMICONDUCTOR LASER 失效
公开(公告)号：JPS61174786A
公开(公告)日：1986-08-06
申请号：JP1601185
申请日：1985-01-30
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , SHIBATA ISAMU , KANEKO YUTAKA
IPC分类号： H01S5/06 , B41J2/44 , G02B6/42 , G03G15/04 , H01S5/026 , H01S5/0683
摘要： PURPOSE:To make the adjustment of the intensity of the laser output simple and accurate, by combining a semiconductor laser, a light detector, an amplifier and a varying means of the output signal of the amplifier in one unit. CONSTITUTION:In the laser output control device of a laser printer, a laser 1, a light detector 9, an amplifier 11 and adjusting means 17 constitute one replaceable unit 18. A reference signal Vref is applied to a comparator 12 from a fixed reference power source. The adjusting means 17 makes the gain of the amplifier variable. The adjusting means 17 is a variable resistor, which is connected between an output terminal and an inverted input terminal. The adjustment of the unit 18 is carried out as follows: the output intensity of the laser 1 is measured; the gain of the amplifier 11 is adjusted by the variable resistor 17; and the output of the amplifier is made to agree with the reference signal when the output of the laser 1 has the required intensity. The adjustment can be performed accurately and simply by the maker using the same power meter. Users are not required to adjust the output intensity of the laser 1.

24. 发明专利

JPS60172880A MAGNIFICATION ERROR CORRECTION SYSTEM 失效
公开(公告)号：JPS60172880A
公开(公告)日：1985-09-06
申请号：JP2807684
申请日：1984-02-17
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , FUNATO HIROYOSHI
IPC分类号： G02B26/10 , H04N1/04 , H04N1/113
摘要： PURPOSE:To enable correction of magnification errors caused by variance of oscillation wavelength of a semiconductor laser by making output signal frequency of a PLL, which generates a clock signal synchronizing with a reference signal from a reference clock signal generator and transmits it to a modulation signal outputting means, variable. CONSTITUTION:The oscillation of a voltage control oscillator 17 is controlled so that a phase difference between a reference clock signal from a reference clock signal generator 19 and an output signal of a frequency divider 18 will be made zero, and an output of the voltage control oscillator 17 is added to said phase locked circuit 2 as a clock signal. Reference oscillation wavelength of a semiconductor laser 3 is set to 780-800nm, which is divided into three segments I , II and III. When the oscillation wavelength of the laser 3 is of the segment I , a demultiplication ratio N of the divider 8 is selected by a demultiplication ratio selecting switch 29 so that an output signal frequency f0 of the voltage control oscillator 17 will be 1.874mHz. In the same manner, the ratio N is selected by said switch 29 so that the output signal frequency f0 of the voltage control oscillator 17 will be 1.890mHz and 1.906mHz in case of segments I and II, respectively.

25. 发明专利

JPS60169819A MODULATING SIGNAL GENERATING DEVICE FOR SYNCHRONISM DETECTION 失效
公开(公告)号：JPS60169819A
公开(公告)日：1985-09-03
申请号：JP2570684
申请日：1984-02-14
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI
IPC分类号： G02B26/10 , H01S5/042 , H01S5/06
摘要： PURPOSE:To improve precision, to set the time width of a modulating signal for synchronism detection short, to shorten the turn-on time of a semiconductor laser, and to reduce fatigue by generating the modulating signal for synchronism detection by a counter. CONSTITUTION:The counter 11 counts clock pulses of constant frequency from a clock pulse generator 12. The counter 11 holds its output at a low level during counting operation and goes up to a high level after entering a full-count state. The synchronism detection signal of a synchronous detector 9 is passed through an AND gate 13 with the high-level output signal of the counter 11 to reset the counter 11 to zero, which then starts counting clock pulses. The output signal of the counter 11 is sent as the modulating signal for synchronism detection to a semiconductor laser driving circuit 1 to turn on the semiconductor laser when the level is high. The signal is generated precisely by the counter 11 for a constant time, so the time width of the output signal is set short to shorten the turn-on time of the semiconductor laser 3.

26. 发明专利

JPS60138568A ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE 失效
公开(公告)号：JPS60138568A
公开(公告)日：1985-07-23
申请号：JP24461383
申请日：1983-12-27
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , MOCHIMARU HIDEAKI
IPC分类号： G03G15/08 , G03G15/04 , G03G15/043 , G03G15/06 , G03G15/09 , G03G21/00
摘要： PURPOSE:To obtain an image with gradations suitable to a mode automatically by switching resistance values of a variable resistance provided to the grounding of a sleeve interlocking with mode switching. CONSTITUTION:When carriers and toner are used as a developer, a magnetic brush is formed on the surface of a magnetic sleeve 6a which includes a fixed magnetic pole and has a rotating cylinder made of a nonmagnetic material and carriers operate as a fine contacting electrode group, so half-tone image reproducibility with electrode effect is obtained. This half-tone image reproducibility varies with the resistance value of the variable resistance 6b provided to the grounding of the sleeve 6a, so the resistance value of the resistance 6b is set low in print mode or high in copy mode to attain soft-tone development in print mode or hard-tone development in copy mode. For the purpose, the resistance value of the resistance 6b is switched interlocking with a mode changeover switch to obtain an image with gradations suitable to the modes automatically.

27. 发明专利

JPS60107373A DRIVING METHOD OF ARRAY-LIKE LIGHT SOURCE 失效
公开(公告)号：JPS60107373A
公开(公告)日：1985-06-12
申请号：JP21750683
申请日：1983-11-17
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI
IPC分类号： B41J2/44 , B41J2/45 , B41J2/455 , G03G15/04 , G06K15/12 , H04N1/036
摘要： PURPOSE:To improve the quality of printing for an optical printer with the application of a stable quantity of light to a photosensitive body by regulating an array-like light source detecting the quantity of light on the photosensitive body to making the light adjustable according to any change in the ambient temperature, aging and the like. CONSTITUTION:For example, an LED array 17 for sampling is provided at one end of an LED array light source 16 while a photosensor 18 is provided on a photosensitive drum 1 to detect the quantity of light corresponding the array 17. In addition, a light writing head 3 of an optical printer is so arranged that the output of the photosensor 18 is inputted into a sample hold circuit 20 via an integration circuit 19. Thus, the sampling array 17 lights according to a sampling signal, the photosensor 18 detects the quantity of light emitted on the photosensitive body drum 1 and according to the output of the photosensor 18, the applied voltage of the LED is controlled to regulate light of the LED array 16.

28. 发明专利

JPS60107372A DRIVING METHOD OF LED ARRAY LIGHT SOURCE 失效
公开(公告)号：JPS60107372A
公开(公告)日：1985-06-12
申请号：JP21750583
申请日：1983-11-17
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI
IPC分类号： H01L33/00 , B41J2/44 , B41J2/45 , B41J2/455
摘要： PURPOSE:To reduce the heating value of a head and burden on the driver by controlling current flowing through a resistance connected between a power source for driving LEDs and each of the LEDs to reduce power consumption thereof. CONSTITUTION:An LED5 is connected to a cathode common to make an array chip, which is arranged in plurality to form an LED array 1. Driver elements 6 are each connected to the LEDs 5 while a driving power source VLED is connected thereto through each resistance R and transistors Tr1 and Tr3 to apply a total bit OFF signal (d) to the base of the transistor Tr3 as control signal. Then, since the total bit of the LED array 1 is OFF in the upper end margin t1 and the lower end margin t3 of a paper, the signal is entered into the transistor Tr3 to turn OFF the transistor Tr3, which turns OFF the transistor Tr1 to cut off between the LED driving power source VLED and the resistance R.

29. 发明专利

JPS6094369A OPTICALLY WRITING HEAD 失效
公开(公告)号：JPS6094369A
公开(公告)日：1985-05-27
申请号：JP20212183
申请日：1983-10-28
申请人： RICOH KK
发明人： HIRASAWA JIYUNICHI , MOCHIMARU HIDEAKI , SHIMADA KAZUYUKI
IPC分类号： H01R24/00 , B41J2/44 , B41J2/447 , B41J2/45 , B41J2/455 , B41J2/46 , H01R13/631
摘要： PURPOSE:To obtain exact connection without fear of disconnection by a method in which connectors to be connected by insertion to the connectors on the body of an optical printer are provided on the end face of an optical writing head, and positioning pins are also provided there. CONSTITUTION:An optical writing head is inserted along a guide rail 33, and positioning pins 32 are inserted into the positioning holes on the head body side. A connector 31 is thus allowed to insert into the connector on the head body side, and a drive circuit is connected to interface, etc., on the head body side. Since the connector 31 is integrated with the head by a circuit-pattern connection without creeping of lead wire on the head 1, connection can be simply made on one- touch basis without fear of disconnection when the head 1 is taken in or out. Since the connector 31, etc., are set on the end face 30, the whole size of the optical writing head can be miniaturized.

30. 发明专利

JPS6011375A LED ARRAY LIGHT SOURCE 失效
公开(公告)号：JPS6011375A
公开(公告)日：1985-01-21
申请号：JP11974983
申请日：1983-06-30
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , HIRASAWA JIYUNICHI
IPC分类号： G03B27/32 , B41J2/44 , B41J2/45 , B41J2/455 , G03G15/04 , B41J3/21
摘要： PURPOSE:To make it possible to secure linearity, in an LED rray light source for an electrophotographic system, by arranging blocks so as to successively shift the same at every distance over which a photosensitive element moves during an ON/OFF control transfer time between the blocks. CONSTITUTION:When a distance, over which a photosensitive element moves for am ON/OFF control transfer time between blocks B1, B2,... of an LED array, is set to DELTAl, the blocks are arranged stepwise at every distance DELTAl in a sub- scanning direction. In this driving control system, the blocks are divided into two groups in a main scanning direction to attain speed acceleration but, for example, blocks B11, B12 are simultaneously subjected to ON/OFF control and handled as one block B1 though spaced apart to each other while blocks B12, B22,...B1N, B2N are arranged so as to be successively shifted by DELTAl. By this method, in spite of time sharing, the formation of a stepwise latent image is eliminated to make it possible to secure linearity.

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