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91. 发明专利

JPS60172879A MAGNIFICATION ERROR CORRECTION SYSTEM 失效
公开(公告)号：JPS60172879A
公开(公告)日：1985-09-06
申请号：JP2807584
申请日：1984-02-17
申请人： RICOH KK
发明人： FUNATO HIROYOSHI , SHIMADA KAZUYUKI
IPC分类号： G02B26/10 , H04N1/04 , H04N1/113
摘要： PURPOSE:To enable correction of magnification error caused by variance of oscillation wavelength of a semiconductor laser by providing a clock signal generating means for generating a clock signal and transmitting it to a modulation signal outputting means and a means for changing frequency of a clock signal and correcting magnification errors. CONSTITUTION:Oscillators 15-17 generate clock signals having various different typesof frequency, and a multiplexer 18 selects the clock signals from the oscillators 15-17 in accordance with the signal from a changeover switch and transmits them to a phase locked circuit 2. Reference oscillation wavelength of a semiconductor laser 3 is set to 790nm. When its oscillation wavelength is of a segment ''1'', the multiplexer 18 switches the changeover switch so that the clock signal of 1.874mHz from the oscillator 15 can be selected. In the same manner the multiplexer 18 switches the changeover switch so that the clock sigal of 1.890mHz and that of 1.906mHz can be selected in case of a segment II and in case of a segment III, respectively. Thus when three types of clock frequency are used, magnification errors can be reduced to 1/3 compared with the use of only one clock frequency.

92. 发明专利

JPS60170371A SYNCHRONIZING SIGNAL GENERATOR 失效
公开(公告)号：JPS60170371A
公开(公告)日：1985-09-03
申请号：JP2570584
申请日：1984-02-14
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , NIRO MASAKAZU
IPC分类号： H04N1/23 , H04N1/36
摘要： PURPOSE:To reduce malfunction due to noise remarkably in a photorecording device by providing a gate circuit and controlling signals sent from a synchronism detector to a phase synchronizing circuit through an electric wire. CONSTITUTION:A gate circuit 12 is provided in a laser printer to control signals sent from the synchronism detector 9 to the phase synchronizing circuit 2 through an electric wire 11. The circuit 12 is opened by a modulation signal for synchronism detection from a modulation signal for synchronism detection generating section in the circuit 2 during synchronism detecting period and passes synchronizing signals from the detector 9 to the circuit 2. However, during the time other than synchronism detecting period and modulation signal for synchronism detection is not inputted, the circuit is closed and invalidates signals from the detector 9. The circuit 12 is provided at nearly the same place with the circuit 2, and the detector 9 and the circuit 12 are connected by a long electric wire 11. Noise entered from the electric wire 11 is cut off during the time other than synchronism detecting period, and malfunction caused by noise of the circuit 2 is reduced sharply.

93. 发明专利

JPS60128773A RECORDER 失效
公开(公告)号：JPS60128773A
公开(公告)日：1985-07-09
申请号：JP23753483
申请日：1983-12-16
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , MOCHIMARU HIDEAKI
IPC分类号： G03B27/54 , B41J2/44 , B41J2/45 , B41J2/455 , G03G15/04 , G03G15/043 , H04N1/036 , H04N1/04
摘要： PURPOSE:To make it unnecessary to have a heater for preventing special dew condensation by providing a DC power source for preventing dew condensation which makes an emitting element array for a writing light source light up during the time of non-operation of the device at the front step of the main switch. CONSTITUTION:When a recorder 20 is not operated, the lighting-up time of an LED array 27 is controlled by an LED array controller 25. Lighting-up of the LED array 27 because of the dew condensation prevention in the empty time during operation of the device 20 is controlled by a main controller 24. In other words, when it is judged that a switch 22 and an outer switch 29 turn off, the dew condensation prevention device does not operate. When the outer switch 29 turns on, lighting-up is executed for a certain time by the LED controller 25 after putting out the LED array 27 for a certain time. When the switch 22 turns on and the outer switch 29 turns off, the dew condensation prevention device does not operate. When the outer switch 29 turns on and the print signal occurs, the dew condensation prevention device does not operate. When the signal does not occur, the flickering is executed at suitable timing.

94. 发明专利

JPS6048035A DUST PROTECTING DEVICE FOR IMAGE FORMING ELEMENT 失效
公开(公告)号：JPS6048035A
公开(公告)日：1985-03-15
申请号：JP15615183
申请日：1983-08-26
申请人： RICOH KK
发明人： HIRASAWA JIYUNICHI , MOCHIMARU HIDEAKI , SHIMADA KAZUYUKI
IPC分类号： G03B27/32 , B41J2/44 , B41J2/45 , B41J2/455 , G03B27/50 , G03G15/00 , G03G15/04 , G03G15/32
摘要： PURPOSE:To prevent an image forming element from being stained with toner, etc., and to improve the picture quality by surrounding the image forming element with a frame body, and flocking an insulating brush closely on the frame body so that the tip part contacts the surface of a photosensitive body. CONSTITUTION:An electrostatic charger 2, LED array 3, image forming element 4, developing unit 5, transfer charger 6, etc., are provided at the circumference of the photosensitive drum 1, and the frame body 13 is provided while surrounding the frame body 13 on all sides. The insulating brush 14 made of insulating and sufficiently soft material is flocked closely on the frame body 13 with the tip part in contact with the surface of the photosensitive drum 1. Consequently, particles of toner, powder of transfer paper 9, etc., are prevented from sticking to the surface of an insulated element 4, and unevenness of LED light forming an image on the surface of the photosensitive drum 1 is therefore prevented to obtain a transfer image of superior picture quality.

95. 发明专利

JPS6047556A DRIVING METHOD OF ARRAY TYPE LIGHT SOURCE 失效
公开(公告)号：JPS6047556A
公开(公告)日：1985-03-14
申请号：JP15615583
申请日：1983-08-26
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI
IPC分类号： H04N1/036 , B41J2/44 , G09G3/14 , G09G3/20 , G09G3/32 , H04N1/04
摘要： PURPOSE:To obtain dot density in a subscanning direction with simple circuit constitution by utilizing an exposure time control signal to set power-source off time per line. CONSTITUTION:An exposure time control clock generated by an exposure time clock generator 2 is counted 3 and the counted value is decoded 4 to drive a specific block of an LED array 1 through an LED array block driver 5. When time-division driving from one block to M blocks is completed, the counter 3 is switched to an off counter 6. The present value of the counter 6 is varied to turn off approximately all of the LED array 1 by difference (1/DV)-Mt. The driver 5 is activated when a row simultaneous signal is at H and inactivated when at L; and the period of the off state is controlled by the counter 6 to generate an approximate value of (1/DV)-Mt.

96. 发明专利

JPS59229502A ELEMENT FOR OPTICAL WRITING 失效
公开(公告)号：JPS59229502A
公开(公告)日：1984-12-24
申请号：JP10418283
申请日：1983-06-13
申请人： RICOH KK
发明人： ARAMAKI KAZUO , SHIMADA KAZUYUKI
IPC分类号： G02B5/22 , B41J2/45 , H04N1/036
摘要： PURPOSE:To correct the variance in the luminance at light emitting points by a simple means with high accuracy by disposing a filter having different light transmittances between the plural light emitting points and the point to be written. CONSTITUTION:A filter 4 is provided between the respective LEDs 3 on an LED array 1 on a base plate 2 and the surface to be written. The filter 4 is formed by exposing a photosensitive material such as a photographic film by the light emitted for a fixed time under a fixed voltage from the respective LEDs 3 in the mounting position and developing and fixing said material. The filter is so formed as to have the transmittance inversely proportional to the luminances of the LEDs 3. The variance in the luminances of the LEDs 3 is thus corrected.

97. 发明专利

JPS59894A Light emitting display unit 失效
公开(公告)号：JPS59894A
公开(公告)日：1984-01-06
申请号：JP10933982
申请日：1982-06-25
申请人： Ricoh Kk
发明人： SHIMADA KAZUYUKI , HOSAKA MASAO
IPC分类号： H05B37/02 , G08B5/00 , G08B5/36
CPC分类号： Y02B20/46

98. 发明专利

JPS58140993A CONTROLLER FOR LAMP 失效
公开(公告)号：JPS58140993A
公开(公告)日：1983-08-20
申请号：JP2228782
申请日：1982-02-15
申请人： RICOH KK
发明人： HOSAKA MASAO , SHIMADA KAZUYUKI
IPC分类号： H05B37/02 , H05B41/36 , H05B41/38 , H05B41/392

99. 发明专利

JPS586480A REFLECTION DETECTOR 失效
公开(公告)号：JPS586480A
公开(公告)日：1983-01-14
申请号：JP10418681
申请日：1981-07-03
申请人： RICOH KK
发明人： SHIMADA KAZUYUKI , NAGASAWA KIYOTO
IPC分类号： H01L31/12 , G01S7/481 , H03K17/78
摘要： PURPOSE:To obtain a reflection reflection having a small part opposite to an object to be detected, by setting the end face of one side of a light transmitter opposite to the object to be detected, providing a light emitting element and a photodetector opposite to each other on the end face of the other side and forming the optical paths for the irradiating light and reflected light within the light transmitter. CONSTITUTION:An end face of a light transmitter is set opposite to an object to be detected, and a light emitting element and a photodetector are set opposite to each other on the other end face. A circuit is connected to the photodetector to emit a signal when the object to be detected is detected. At the same time, an optical path for the irradiating light from the object to be detected and an optical path for the light reflected from the object to be detected are provided in the light transmitter. For instance, an end of an optical fiber 9 is set opposite to an object to be detected as an end face 901 opposite to the object 8. The other end of the fiber 9 is connected to a holder 12. This holder 12 supports a light emitting element 10 and a photodetector 11 opposite to a face 902 opposite to the holder 12.

100. 发明专利

JP2004004854A IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2004004854A
公开(公告)日：2004-01-08
申请号：JP2003143127
申请日：2003-05-21
申请人： RICOH KK
发明人： NAKAZATO YASUFUMI , SHIMADA KAZUYUKI , NAKAJIMA TOMOHIRO
IPC分类号： B41J2/44 , G03G15/01 , G03G15/04 , G03G21/18
摘要： PROBLEM TO BE SOLVED: To eliminate banding due to vibration of an imaging cartridge in an image forming apparatus having a plurality of imaging cartridges detachably loaded in a main body while arrayed on over another. SOLUTION: Provided is a structural member 25 which partitions adjacent imaging cartridges while the plurality of imaging cartridges (4, 5, 6, and 7) are loaded in the main body (22). COPYRIGHT: (C)2004,JPO

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