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1. 发明专利

JP2007001057A OPTICAL SCANNER AND IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2007001057A
公开(公告)日：2007-01-11
申请号：JP2005181343
申请日：2005-06-22
申请人： RICOH KK
发明人： ISHIDA MASAAKI , NIHEI YASUHIRO , OMORI JUNJI
IPC分类号： B41J2/44 , G02B26/10 , H04N1/04 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To scan an object precisely with a plurality of light beams from a light source unit. SOLUTION: When a photosensitive drum is scanned with light beams containing image information from a light source unit having three main light sources and three correction light sources, a processing circuit creates the control signal of each light source based on the positional information of a pixel formed by scanning. If there is a difference exceeding a tolerance limit between the distribution of quantity of light from the main light sources 1, 2 and 3 and an ideal distribution of quantity of light on the photosensitive drum, control signals of the correction light sources 1 and 2 are created depending on the difference. Consequently, the distribution of quantity of light on the photosensitive drum can be brought close to an ideal one when the photosensitive drum is scanned with light beams from a plurality of light sources. COPYRIGHT: (C)2007,JPO&INPIT

2. 发明专利

JP2003103830A METHOD OF GENERATING PIXEL CLOCK, PIXEL CLOCK GENERATING APPARATUS, AND IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003103830A
公开(公告)日：2003-04-09
申请号：JP2001302644
申请日：2001-09-28
申请人： RICOH KK
发明人： OMORI JUNJI , ISHIDA MASAAKI , NIHEI YASUHIRO
IPC分类号： B41J2/44 , G02B26/10 , H04N1/036 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To provide a method of generating a pixel clock, a pixel clock generating apparatus, and an image forming apparatus wherein an amount of correction data is markedly reduced, cost reduction can be achieved by reduction of the memory size along with the reduction of the correction data, and moreover accurate correction of position shift of a dot can be executed. SOLUTION: This pixel clock generating apparatus comprises a data region setting means for setting a data region based on a data region set value for determining a number of clock signals in the data region consisting of a plurality of continuous clock signals and a phase shift data setting means for setting phase shift data for executing the phase shift by each data region set by the data region setting means.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 发明专利

JPH05129706A SEMICONDUCTOR LASER DRIVING CONTROL CIRCUIT 失效
公开(公告)号：JPH05129706A
公开(公告)日：1993-05-25
申请号：JP29265791
申请日：1991-11-08
申请人： RICOH KK
发明人： TAKEYAMA YOSHINOBU , EMA HIDETOSHI , ISHIDA MASAAKI
IPC分类号： B41J2/44 , G03G15/04 , G11B7/125 , H01S5/068 , H03F3/45
摘要： PURPOSE:To enhance the degree of preciseness in control of the forward current of a semiconductor laser by forming a comparative amplifier with a high impedance input part and a driving current converting circuit. CONSTITUTION:A comparison amplifier 1 is formed by successively connecting a high impedance input part 6 having an emitter follower, differential amplification circuit 7 and a driving current converting circuit 8. Consequently, the interterminal voltage of a capacitor C is changed by the differential current between the current Is corresponding to a light emission level instruction signal and the current Im corresponding to a light receiving signal, and the above- mentioned interterminal voltage is inputted to the differential amplification circuit 7 through the intermediary of the high impedance input part 6. As a result, the output of the differential amplification circuit 7 changes in proportion to the change of the interterminal voltage. In other words, the differential current is amplified. By passing the differential amplification circuit 7's output through the driving current converting circuit 8, the driving current (forward current) of an excellently controlled semiconductor laser 3, which becomes the desired luminous energy in proportion to the output of the differential amplification circuit 7, can be obtained.

9. 发明专利

JPH05129703A SEMICONDUCTOR LASER DRIVING CONTROL CIRCUIT 失效
公开(公告)号：JPH05129703A
公开(公告)日：1993-05-25
申请号：JP29265491
申请日：1991-11-08
申请人： RICOH KK
发明人： TAKEYAMA YOSHINOBU , EMA HIDETOSHI , ISHIDA MASAAKI
IPC分类号： B41J2/44 , G03G15/04 , G11B7/125 , H01S5/068
摘要： PURPOSE:To reliably obtain the laser power of the desired light emission level by providing a first light emission level instruction signal forming circuit and a laser power adjusting circuit. CONSTITUTION:The forward current of a semiconductor laser 3 is controlled in such a manner that a light receiving signal and a first light emission level instruction signal are made equal by comparing the light receiving signal of a light receiving element 4 and a first light emission level instruction signal by a comparative amplifier 1. Also a current converter 2 outputs the preset current in accordance with the above-mentioned light emission level instruction signal so that the light receiving signal and the light emission level instruction signal will be made equal. The total current of the output current of the current converter 2 and the control current outputted from the comparison amplifier 1 forms the forward current of the semiconductor laser 3 to be controlled. The first light emission level instruction signal is formed and outputted by a laser power adjusting circuit 6 with which the laser output power is adjusted. This laser power adjusting circuit 6 is composed of a reference current setting circuit 7, a first light emission level instruction signal forming circuit 8 and a correction circuit 9.

10. 发明专利

JPH04103262A PICTURE FORMING DEVICE AND METHOD 失效
公开(公告)号：JPH04103262A
公开(公告)日：1992-04-06
申请号：JP22068590
申请日：1990-08-22
申请人： RICOH KK
发明人： HATTORI HITOSHI , EMA HIDETOSHI , ISHIDA MASAAKI , IMAGAWA SUSUMU , TAKEYAMA YOSHINOBU
IPC分类号： H04N1/23 , H04N1/40 , H04N1/405
摘要： PURPOSE:To obtain high picture quality by selecting 1st and 2nd specific means in response to a differential coefficient of inputted picture element information. CONSTITUTION:Plural pulse widths are set by a 1st means 12, each pulse width is selected based on the picture information and an exposure luminous quantity is changed for each picture element according to each picture element information and the pulse width is selected and changed over based on a specific picture element density. A 2nd means 11 sets an exposure pattern in a matrix in the unit of the matrix comprising plural picture elements in which the size of the matrix in the subscanning direction is 2 or over and the size of the matrix in the main scanning direction is 1 or over so that the spatial frequency of the exposure pattern in the matrix in the subscanning direction is highest. Then the 1st means 12 and the 2nd means 11 are selected in response to the differential coefficient of the picture element information to be inputted by a 3rd means 13. Thus, the picture with high quality whose resolution is improved is obtained.

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