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1. 发明专利

JP2004005781A INFORMATION-RECORDING APPARATUS 审中-公开
公开(公告)号：JP2004005781A
公开(公告)日：2004-01-08
申请号：JP2002156988
申请日：2002-05-30
申请人： RICOH KK
发明人： MASUI NARIHIRO , EMA HIDETOSHI
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To control a drive current for always obtaining desired output light intensity, without the occurrence of special write pulses or interruptions of record operation which incurs data missing, even if a threshold current and differential quantum efficiency of a light source vary, and also to control it to obtain the desired output light intensity at a high speed, immediately after the start of information recording. SOLUTION: In controlling the scale of a bias current and a modulated current so that a monitoring light-receiving signal, which is generated by monitoring with a photodetector, a part of the outgoing light intensity of a light source 102 which generates light for recording information on an information recording medium 100, and a luminescence reference signal proportional to target optical output waveform of the light source 102 substantially coincide, a control band for controlling scale of the modulated current is made high in predetermined period, after the start of information recording. COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2003132571A LIGHT SOURCE DRIVING DEVICE 审中-公开
公开(公告)号：JP2003132571A
公开(公告)日：2003-05-09
申请号：JP2001323544
申请日：2001-10-22
申请人： RICOH KK
发明人： MASUI NARIHIRO , EMA HIDETOSHI
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To achieve also requests for an improvement in the speed of information recording, and high density recording to an information recording medium, etc., without sacrificing cost and performances, etc., by suppressing a deviation from a desired value of a light modulation waveform due to distortion and skew, etc., of a light modulation control signal waveform. SOLUTION: Based on a modulating signal which shows change timing of an irradiation level of a light source, a state transition signal which indicates a state transition corresponding to the irradiation level, and a transition rule set beforehand; the state transition is controlled. Modulation data corresponding to a state selected are generated and driving current of the light source is modulated based on the modulation signal and the modulation data.

3. 发明专利

JP2003098456A IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003098456A
公开(公告)日：2003-04-03
申请号：JP2001289691
申请日：2001-09-21
申请人： RICOH KK
发明人： ITABASHI AKIHISA , EMA HIDETOSHI
IPC分类号： B41J2/44 , G02B26/10 , G02B26/12 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To obtain high image quality by controlling image forming timing or controlling the modulation of a semiconductor laser at high speed even by inexpensive compact constitution in an image forming apparatus having a light source part by a multibeam optical system. SOLUTION: A high frequency clock VCLK is generated from a reference clock by a phase lock loop constituted of a phase comparator circuit 201, a low-pass filter 202, a voltage control oscillation circuit 203 and a programmable counter 204, and is frequency-divided by a 1/8 frequency divider circuit 206 so as to generate a pixel clock. At such a time, the pixel clock is synchronized with a synchronizing pulse, and also the counting operation of the circuit 206 is stopped according to a phase set signal, so that a phase is delayed by 1/8 clock so as to finely adjust the cycle of the pixel clock.

4. 发明专利

JP2002298374A LIGHT RECEIVING SIGNAL PROCESSOR 失效
公开(公告)号：JP2002298374A
公开(公告)日：2002-10-11
申请号：JP2001103762
申请日：2001-04-02
申请人： RICOH KK
发明人： MASUI NARIHIRO , EMA HIDETOSHI
IPC分类号： G11B7/005 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide a light receiving signal processor that can eliminate the need for changing a circuit even when the configuration of a part to output a light receiving signal is changed, can be made low in cost by relaxing required specifications of a part having a plurality of light sources and light receiving parts especially to compatibly cope with a plurality of kinds of light receiving signals, can reduce signal degradation due to noise in signal supply by an FPC board and can reduce the number of signal lines transferring the signal. SOLUTION: An output to a plurality of kinds of processes is changed over by inputting the light receiving signals of analog signals by an input selecting part 1, the light receiving signals are successively converted from the analog signals to digital signals in time series and outputted by an A/D converter 3, the light receiving signals are transmitted by a first I/F part 32 and a second I/F part 33 and arithmetic processings of the plurality of kinds of processes are executed based on the light receiving signals by a servo signal arithmetic processing part 13.

5. 发明专利

JP2002298373A LIGHT RECEIVING SIGNAL PROCESSOR 失效
公开(公告)号：JP2002298373A
公开(公告)日：2002-10-11
申请号：JP2001103746
申请日：2001-04-02
申请人： RICOH KK
发明人： MASUI NARIHIRO , EMA HIDETOSHI
IPC分类号： G11B7/005 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To easily realize a light receiving signal processor suitable to be mounted on optical pickup. SOLUTION: An input selecting part 1 switches output to a plurality of kinds of processes by inputting light receiving signals of analog signals, a control part 11 controls switch of output by the input selecting part 1 based on preliminarily programmed output rules, an A/D converter 3 successively converts the light receiving signals outputted from the input selecting part 1 from the analog signals into digital signals in time series and output them, a first I/F part 32 and a second I/F part 33 transmit the light receiving signals outputted from the A/D converter 3 to a servo signal arithmetic processing part 13 and the servo signal arithmetic processing part 13 executes arithmetic processings of the plurality of the processes based on the light receiving signals.

6. 发明专利

JP2001201910A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001201910A
公开(公告)日：2001-07-27
申请号：JP2000009630
申请日：2000-01-19
申请人： RICOH KK
发明人： OMORI JUNJI , EMA HIDETOSHI , ITO SATORU , NAKAJIMA TOMOHIRO , ISHIDA MASAAKI , ITO TATSUYA
IPC分类号： G03G21/00 , G03G15/01 , G03G21/18
摘要： PROBLEM TO BE SOLVED: To provide an image forming device which houses a photoreceptor, a light source means, a light projecting means and a substrate mounting a driving circuit for the light source means, etc., and enables a user to confirm whether or not an attachable/detachable image forming unit for every color is loaded in an appropriate position. SOLUTION: In the color image forming device 100, each color image forming unit 103Y, 103M, 103C and 103K is attachably/detachably loaded in each corresponding color opening part, and a discrimination plate 240 for discriminating whether each image forming unit 103Y, 103M, 103C and 103K is appropriately loaded in the opening part in accordance with the color of stored toner 214Y, 214M, 214C and 214K is attached to each unit, besides, a slit for making the discriminating plate 240 pass through is formed in the main body case 101. Then, each image forming unit 103Y, 103M 103C and 103K is easily and surely replaced while preventing each unit from being erroneously loaded.

7. 发明专利

JP2001186348A PULSE WIDTH MODULATION CIRCUIT, OPTICAL WRITER AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001186348A
公开(公告)日：2001-07-06
申请号：JP2000090475
申请日：2000-03-29
申请人： RICOH KK
发明人： ISHIDA MASAAKI , EMA HIDETOSHI
IPC分类号： B41J2/44 , G06K15/12 , H03K7/08 , H04N1/40 , H04N1/405
摘要： PROBLEM TO BE SOLVED: To provide a pulse width modulation circuit capable of solving a problem that the linearity/reproducibility of a triangle wave or a tooth-shaped wave is not consistent with acceleration of an operating speed and that the gradation of an image is not consistent with acceleration of the operating speed. SOLUTION: The circuit is provided with an analog delay 15 of a fast analog delay circuit constitution having a signal generation means for generating a clock signal to be a reference and a signal inversely proportional to a digital data input signal and a delay quantity generation means for desirably phase- delaying the clock signal based on the signal inversely proportional to the digital data input signal from the signal generation means, a delay quantity control means 16 for controlling the delay quantity of this part 15 and a modulation signal generating means 17 for generating a modulated signal given pulse width modulation from a pulse and the clock signal from the part 15. Thus the circuit can cope with the case of a high operating speed and can realize the high gradation of an image, etc.

8. 发明专利

JP2001183598A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001183598A
公开(公告)日：2001-07-06
申请号：JP36917899
申请日：1999-12-27
申请人： RICOH KK
发明人： ITO SATORU , NAKAJIMA TOMOHIRO , EMA HIDETOSHI , ISHIDA MASAAKI , ITO TATSUYA , OMORI JUNJI
IPC分类号： G03G21/14 , B41J2/44 , G02B26/10 , G03G15/04 , G03G15/043 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To provide an image forming device to which an image forming unit containing a photosensitive body, a light source means and its driving circuit, a light irradiating means, and a mechanism controlling the rotating speed of a polygon mirror, the operating frequency of the light source means, etc., according to image recording density is fitted detachably and has excellent recyclability and image quality. SOLUTION: The image forming unit 205 is mounted detachably on the image forming device 200 and a connector 231 of the image forming unit 205 is automatically connected to a connector 241 of the image forming device by the insertion of the image forming unit 205. The image forming unit 205 supports a photoreceptor drum 213, an electrostatic charging roller 214, a polygon mirror 216, a scanning lens 215, a printed board 222, etc., between a main body upper case 210 and a main body lower case which can be separated from each other, and a semiconductor laser, etc., is mounted on the printed board 222. The image forming unit 205 has the mechanism adjusting the rotating speed of the polygon mirror 217 and the driving frequency of the semiconductor laser according to image recording density and forms a distortionless image.

9. 发明专利

JPH09321376A SEMICONDUCTOR LASER CONTROLLER 失效
公开(公告)号：JPH09321376A
公开(公告)日：1997-12-12
申请号：JP7324097
申请日：1997-03-26
申请人： RICOH KK
发明人： EMA HIDETOSHI , ISHIDA MASAAKI , MASUI NARUHIRO
IPC分类号： H01S5/068 , H01S3/133
摘要： PROBLEM TO BE SOLVED: To control the optical output by forming an error amplifier for controlling the forward current of a semiconductor laser and a current drive section for feeding a drive current corresponding to an emission command signal, as a forward current, to the semiconductor laser on one chip of an integrated circuit. SOLUTION: An optoelectric feedback loop 6 is formed by connecting a semiconductor laser 3 and a light receiving element 4 in loop while including an error amplifier 8. Output from the semiconductor laser 3 is monitored by the light receiving element 4 and the forward current of the semiconductor laser 3 is controlled such that the optical output is equal to an emission command signal IDA1 generated from a pulse width generating/data modulating section 2. A constant current source 7 functions to feed the semiconductor laser 3 with a forward driving current corresponding to an emission command signal IDA2 generated from the pulse width generating/data modulating section 2. Consequently, the optical output from the semiconductor laser 3 can be controlled basically by the sum (or the difference) of a control current from the optoelectric feedback loop 6 and the driving current from the constant current source 7. The modulating section 2 and the driving section 5 are integrated on one chip.

10. 发明专利

JPH05235446A 失效
公开(公告)号：JPH05235446A
公开(公告)日：1993-09-10
申请号：JP3925592
申请日：1992-02-26
申请人： RICOH KK
发明人： TAKEYAMA YOSHINOBU , EMA HIDETOSHI , ISHIDA MASAAKI
IPC分类号： H01S5/042 , H01S3/096
摘要： PURPOSE:To prevent the missetting of a luminous level command signal by surge current at the time of power application and under unstable circuit conditions, by comparing the magnitudes of a constant potential and a potential of a power voltage minus a constant voltage, and generating a timing signal for generating a luminous level command signal, when the constant potential side s smaller. CONSTITUTION:A power voltage monitor circuit 9 compares the magnitudes of a constant potential and a potential of a power voltage Vcc minus a constant voltage, and judges whether or not the power voltage Vcc is higher than a specified potential. If the constant potential is lower, a timing signal generator circuit 10 is started. On the other hand, if the constant potential is higher, a specified command signal is outputted to a comparison amplifier 2 and a current transformer 7, and control is performed so that driving current may not flow in a semiconductor laser 3. Consequently, it becomes possible to drive the semiconductor laser stably without missetting caused by the variance of the power voltage and the changes of the surrounding temperature.

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