公开(公告)号：US4402022A

公开(公告)日：1983-08-30

申请号：US225006

申请日：1981-01-14

申请人： Akira Hirota ,  Seisuke Hiraguri

发明人： Akira Hirota ,  Seisuke Hiraguri

IPC分类号： G05D3/12 ,  G11B5/588 ,  G11B15/60 ,  G11B21/10

CPC分类号： G11B15/602 ,  G11B5/588

摘要： A tracking control system is used in a magnetic reproducing apparatus which comprises a rotary magnetic head for successively reproducing recorded signals from parallel tracks existing obliquely with respect to the longitudinal direction of a magnetic tape. The tracking system comprises a head swinging mechanism for varying the height position of the rotary magnetic head, and swinging the tracing position of the rotary magnetic head with respect to the track of the magnetic tape in the width direction of the track, a head swinging voltage generating circuit for generating a head swinging voltage, one or a plurality of memories for sampling and memorizing a voltage which is to be supplied to the head swinging means, at a point in time corresponding to when the rotary magnetic head passes one or a plurality of predetermined relative tracing positions respective of the magnetic tape, a level detecting circuit for detecting the level of a signal reproduced by the rotary magnetic head at a point in time identical to that of the above, a maximum level detecting circuit for detecting whether the level detected by the level detecting circuit has reached a maximum, a control circuit for enabling the reading-out of the voltage memorized in the memory upon detection of the maximum level by the maximum level detecting circuit, and an adding circuit for adding the voltage read out from the memory and the head swinging voltage supplied from the head swinging voltage generating circuit, and supplying the added voltage to the head swinging mechanism.

摘要翻译： 在磁性重放装置中使用跟踪控制系统，其包括用于从相对于磁带的纵向倾斜地存在的平行轨迹连续地再现记录信号的旋转磁头。 跟踪系统包括头摆动机构，用于改变旋转磁头的高度位置，并使旋转磁头的跟踪位置相对于磁带在轨道的宽度方向上的轨道摆动，磁头摆动电压 用于产生磁头摆动电压的发生电路，一个或多个存储器，用于在与旋转磁头通过一个或多个磁头的情况相对应的时间点对要提供给磁头摆动装置的电压进行采样和存储 用于检测在与上述相同的时间点由旋转磁头再现的信号的电平的电平检测电路，用于检测是否检测到电平的最大电平检测电路 通过电平检测电路达到最大值的控制电路，用于使能读出备忘录中存储的电压 通过最大电平检测电路检测到最大电平，并且添加电路，用于将从存储器读出的电压和从磁头摆动电压产生电路提供的磁头摆动电压相加，并将加上的电压提供给磁头摆动 机制。

公开(公告)号：US4414586A

公开(公告)日：1983-11-08

申请号：US308666

申请日：1981-10-05

申请人： Akira Hirota ,  Seisuke Hiraguri ,  Takashi Uchimi

发明人： Akira Hirota ,  Seisuke Hiraguri ,  Takashi Uchimi

IPC分类号： G11B5/588 ,  G11B15/18 ,  G11B21/10 ,  G11B21/04 ,  G11B21/02

CPC分类号： G11B15/1808 ,  G11B21/103 ,  G11B5/588

摘要： A pilot signal recording and reproducing system comprises a frequency generating circuit for successively generating a first frequency, a third frequency, a second frequency, and a fourth frequency in this order or in a reverse order for every recording unit of one track, where the first and second frequencies are mutually separated frequencies, selected from a first frequency group, and the third and fourth frequencies respectively are frequencies approximately equal to the first and second frequencies, selected from a second frequency group, a recording device for recording a frequency obtained from the frequency generating circuit as a pilot signal together with an information signal onto a recording medium, a comb filter for frequency-selecting pilot signals recorded on both sides of a track which is to be reproduced, where these pilot signals have mutually different frequencies and are included as crosstalk within a reproduced signal reproduced from the recording medium, a control circuit for controlling a delay time of a delay circuit within said comb filter and first and second filter circuits for respectively discriminating and separating pilot signals having mutually different frequencies obtained from the comb filter.

摘要翻译： 导频信号记录和再现系统包括频率产生电路，用于按照一个轨道的每个记录单元依次产生第一频率，第三频率，第二频率和第四频率，或者以相反的顺序产生第一频率，第三频率，第二频率和第四频率， 并且第二频率是从第一频率组中选择的相互分离的频率，并且第三和第四频率分别是从第二频率组中选出的大致等于第一和第二频率的频率，记录装置，用于记录从 频率发生电路作为导频信号与信息信号一起发送到记录介质上，梳状滤波器用于频率选择记录在待再现的磁道的两侧的导频信号，这些导频信号具有相互不同的频率并被包括 作为从记录介质再现的再现信号中的串扰，控制 用于控制所述梳状滤波器和第一和第二滤波器电路中的延迟电路的延迟时间的电路，用于分别鉴别和分离从梳状滤波器获得的具有相互不同频率的导频信号。

公开(公告)号：US4246616A

公开(公告)日：1981-01-20

申请号：US9077

申请日：1979-02-02

申请人： Seisuke Hiraguri ,  Akira Hirota

发明人： Seisuke Hiraguri ,  Akira Hirota

IPC分类号： G11B5/027 ,  G11B15/18 ,  G11B15/467 ,  H04N5/783 ,  H04N5/78 ,  G11B15/06

CPC分类号： G11B15/1808 ,  H04N5/783

摘要： A video signal reproducing system comprises a tape on which video signals are recorded along video tracks, which extend obliquely to the longitudinal direction of the tape with substantially no space therebetween. A control signal is recorded along a control track extending in the longitudinal direction, the video tracks being recorded by a plurality of rotating video heads having gaps of mutually different azimuth angles. The control signal is recorded along the control track interrelatedly with the recording of the video tracks by the video heads. A motor drives the tape in tape travel or stops the tape. A plurality of rotating, reproducing video heads successively trace the video tracks to pick up and reproduce the recorded video signals. The rotating video heads have gaps which have mutually different azimuth angles that are respectively the same as the first mentioned azimuth angles, and which have different height positions above the plane of rotation of the centers of the tracks in the width direction thereof. The control signals are reproduced from the control track of the traveling tape. A circuit delays the reproduced control signal by a specific time to obtain a delayed signal and uses this delayed signal to stop the motor and therefore the tape travel. The tape is stopped at a position relative to the reproducing video heads at which the reproduction is accomplished so that the time instant when the level of the reproduced video signal becomes a minimum is within or in the vicinity of the vertical blanking period.

摘要翻译： 视频信号再现系统包括一个磁带，视频信号沿视频轨道记录，该磁带沿着磁带的纵向方向倾斜延伸，基本上没有间隙。 沿着沿纵向方向延伸的控制轨道记录控制信号，视频轨迹由具有相互不同方位角的间隙的多个旋转视频头记录。 控制信号沿着与视频磁头对视频轨道的记录相关的控制轨迹进行记录。 电机驱动磁带行走磁带或停止磁带。 多个旋转的再现视频头连续地跟踪视频轨道以拾取和再现所记录的视频信号。 旋转视频头具有与第一方位角分别相同的相互不同的方位角的间隙，并且在其宽度方向上具有高于轨道中心的旋转平面的高度位置。 控制信号从行进带的控制轨道再现。 电路将再现的控制信号延迟特定时间以获得延迟的信号，并使用该延迟信号来停止电动机并因此使磁带行进。 磁带被停止在相对于再现的再现视频头的位置，使得当再现的视频信号的电平变得最小时的时刻在垂直消隐期间内或附近。

公开(公告)号：US5911097A

公开(公告)日：1999-06-08

申请号：US42670

申请日：1998-03-17

申请人： Masayasu Haga ,  Tsugihito Yoshiyama ,  Yasuhiro Nakagami ,  Masami Matsuura ,  Akira Hirota

发明人： Masayasu Haga ,  Tsugihito Yoshiyama ,  Yasuhiro Nakagami ,  Masami Matsuura ,  Akira Hirota

IPC分类号： G03G15/02 ,  G03G21/00

CPC分类号： G03G15/0266 ,  G03G15/0291 ,  G03G2215/021 ,  Y10S430/102

摘要： Applied voltage to the contact charging sheet 71 has been controlled in the following various ways: a) the voltage at the photosensitive layer 10 at a point of time whereat it has passed the contact charging sheet 71 is caused to interlock with grid voltage so as not to exceed predetermined voltage to be electrified by the Scorotron charger 2; b) the applied voltage is caused to interlock with the output from the transfer unit 5 so that there is no portion which reaches the Scorotron charger 2 while the potential polarity has been reversed at the transfer unit 5; c) reduction in the film thickness of the photosensitive layer 10 is corrected in consideration of the cumulative number of sheets for image formation; d) the size of printing sheet is added; e) at the time of termination, a portion of the photosensitive layer 10, into which current has flowed at the transfer unit 5, is caused to stop always after passing the contact charging sheet 71; f) the contact charging sheet 71 is cleaned by means of AC component; and g) the applied voltage is switched while formation of an electrostatic latent image and the like are not performed. Thereby, the surface potential at the photosensitive drum 1 is prevented from becoming ununiform.

摘要翻译： 接触充电片71的施加电压已经以下列各种方式进行了控制：a）使感光层10在已经通过接触充电片71的时间点处的电压与电网电压互锁，使得不 超过预定电压由Scorotron充电器2带电; b）使施加的电压与转印单元5的输出互锁，使得在转印单元5处的电位极性已经反转的情况下，没有到达Scorotron充电器2的部分; c）考虑到用于图像形成的片材的累积数量来校正感光层10的膜厚度的减小; d）添加打印纸的尺寸; e）在终止时，使电流在转印单元5处流动的感光层10的一部分在通过接触充电片71之后始终停止; f）接触充电片71通过AC部件清洁; 并且g）在不形成静电潜像等的情况下切换所施加的电压。 由此，能够防止感光鼓1的表面电位变得不均匀。

公开(公告)号：US4587576A

公开(公告)日：1986-05-06

申请号：US534638

申请日：1983-09-22

申请人： Akira Hirota ,  Yutaka Ichinoi

发明人： Akira Hirota ,  Yutaka Ichinoi

IPC分类号： H04N5/93 ,  G11B20/06 ,  H04N5/922 ,  H04N5/923 ,  H04N5/782

CPC分类号： H04N5/923

摘要： Video signal processing apparatus for processing video signals in which pre-emphasis of high frequency components of signals to be recorded is effected, and de-emphasis of high frequency components of reproduced signals is carried out. The pre-emphasis circuitry and de-emphasis circuitry is of the so called forward and backward type for weighting video signals inputted at past and future time frames.

摘要翻译： 用于处理视频信号的视频信号处理装置，其中进行要记录的信号的高频分量的预加重，并且执行再现信号的高频分量的去加重。 预加重电路和去加重电路是所谓的前向和后向类型，用于加权在过去和未来时间帧输入的视频信号。

公开(公告)号：US4476501A

公开(公告)日：1984-10-09

申请号：US356484

申请日：1982-03-09

申请人： Akira Hirota ,  Yoshihiko Ota

发明人： Akira Hirota ,  Yoshihiko Ota

IPC分类号： H04N5/928 ,  G11B15/14 ,  G11B20/02 ,  H04N9/835 ,  H04N5/782

CPC分类号： H04N9/8355 ,  G11B15/14 ,  G11B20/02

摘要： An audio signal recording and reproducing system in an apparatus for recording and reproducing a video signal with respect to a recording medium by one or a plurality of rotary heads, comprises a first delay circuit for delaying an input recording audio signal by a predetermined time interval, a multiplexing circuit for multiplexing a non-delayed signal which is the input recording audio signal and an output delayed audio signal of the first delay circuit, to obtain a multiplexed audio signal for recording, a recording and reproducing circuit for multiplexing the video signal and the multiplexed audio signal for recording thus obtained, to perform recording and reproduction of the multiplexed signal with respect to the recording medium by the one or a plurality of rotary heads, a reproduced video signal obtaining circuit for separating the video signal from a signal reproduced by the recording and reproducing circuit, to obtain a reproduced video signal, a separating circuit for separating the non-delayed audio signal and the delayed audio signal of the multiplexed audio signal from the signal reproduced by the recording and reproducing circuit, a second delay circuit for delaying the separated non-delayed audio signal by a delay time equal to the delay time of the first delay circuit, and a switching circuit for alternately switching the separated delayed audio signal and an output delayed audio signal of the second delay circuit, to produce a continuous reproduced audio signal.

摘要翻译： 一种用于通过一个或多个旋转磁头记录和再现关于记录介质的视频信号的装置中的音频信号记录和再现系统，包括用于将输入记录音频信号延迟预定时间间隔的第一延迟电路， 用于多路复用作为输入记录音频信号的非延迟信号和第一延迟电路的输出延迟音频信号的多路复用电路，以获得用于记录的多路复用音频信号，用于复用视频信号和 复用的音频信号用于由此获得的记录，以通过一个或多个旋转磁头执行相对于记录介质的复用信号的记录和再现;再现视频信号获取电路，用于将视频信号与由 记录和再现电路，以获得再现的视频信号，用于分离的分离电路 从由记录和再现电路再现的信号中提取多路复用音频信号的非延迟音频信号和延迟音频信号;第二延迟电路，用于将分离的非延迟音频信号延迟等于延迟时间的延迟时间 以及用于交替地切换分离的延迟音频信号和第二延迟电路的输出延迟音频信号的开关电路，以产生连续再现的音频信号。

公开(公告)号：US4178606A

公开(公告)日：1979-12-11

申请号：US731935

申请日：1976-10-13

申请人： Akira Hirota

发明人： Akira Hirota

IPC分类号： H04N9/84 ,  H04N5/79

CPC分类号： H04N9/84

摘要： A color video signal recording system frequency modulates a luminance signal separated from an input color video signal. A first signal processing means converts the frequency of the carrier chrominance signal separated from the input color video signal. The conversion is to a band which is lower than the band of the frequency-modulated luminance signal. The carrier chrominance signal is processed to advance the phase thereof, successively by 90.degree. for every horizontal scanning period, during a specific period. Thereafter, the phase lags successively by 90.degree. for every horizontal scanning period during a successive specific period. For recording, the said frequency-modulated luminance signal and carrier chrominance signal are multiplexed processed, and recorded on a plurality of tracks which are mutually disposed in parallel on a recording medium. The recording is performed in such a manner that a carrier chrominance signal of a phase advancing successively by 90.degree. and a carrier chrominance signal of a phase lagging successively by 90.degree. are in side-by-side disposition on mutual adjacent tracks.A color video signal reproducing system reproduces a signal recorded by the above described recording system. The frequency-modulated luminance signal is demodulated after it is separated from the reproduced signal. A second signal processing means restores the signal which is processed carrier chrominance signal separated from the reproduced signal, into the original frequency band. The chrominance signal is phase shifted successively by 90.degree. for every horizontal scanning period, thereby to restore the original carrier chrominance signal. The output signal of the second signal processing means is delayed one horizontal scanning period. The output signal of the second signal processing means and is mixed with the output signal of the delay means. The demodulated luminance signal is mixed with the output carrier chrominance signal of the mixing means, to produce a reproduced color video signal.

公开(公告)号：US07738815B2

公开(公告)日：2010-06-15

申请号：US12034232

申请日：2008-02-20

申请人： Akira Hirota

发明人： Akira Hirota

IPC分类号： G03G15/01 ,  G03G15/08

CPC分类号： G03G15/0121 ,  G03G15/0887 ,  G03G2215/0132 ,  G03G2215/1661

摘要： The level of toner color mixture in a developing device is maintained within the range not affecting the color shade of a final color image. In an image forming apparatus including four imaging units and placed along a moving intermediate transfer body, the imaging units having developing devices for developing an electrostatic latent image formed on a photoconductor to create a toner image and for collecting toner remaining on the photoconductor after transfer of the toner image, the developing device in the imaging unit performs forcible toner discharge operation when a toner mixture amount in the developing device of the imaging unit, which was computed from toner consumption of the imaging unit located on an upstream side, exceeds a predetermined value.

摘要翻译： 显影装置中的调色剂颜色混合物的水平保持在不影响最终彩色图像的色调的范围内。 在包括四个成像单元并且沿着移动的中间转印体放置的图像形成装置中，成像单元具有显影装置，用于显影形成在光电导体上的静电潜像，以产生调色剂图像，并用于收集转印后剩余在感光体上的调色剂 调色剂图像，当成像单元的显影装置中的调色剂混合量是由位于上游侧的成像单元的调色剂消耗量计算出的调色剂混合物量超过预定值时，成像单元中的显影装置执行强制调色剂排出操作 。

公开(公告)号：US07324776B2

公开(公告)日：2008-01-29

申请号：US11028746

申请日：2005-01-05

申请人： Akira Hirota ,  Hiroaki Umemoto ,  Noritoshi Hagimoto ,  Kuniya Matsuura ,  Naotoshi Kawai ,  Kentaro Katori

发明人： Akira Hirota ,  Hiroaki Umemoto ,  Noritoshi Hagimoto ,  Kuniya Matsuura ,  Naotoshi Kawai ,  Kentaro Katori

IPC分类号： G03G21/00

CPC分类号： G03G21/0064

摘要： A color printer including, a conductive brush roller to contact a photosensitive drum at a position downstream of a transferring apparatus and upstream of a charging apparatus, wherein at least part of residual toner is collected after temporarily transferring on the photosensitive drum, and the collected toner is expelled onto the photosensitive drum, a charge electrode facing the brush roller at a position other than the contact position of the photosensitive drum and the brush roller, and a power source to apply voltage to the charge electrode, wherein the polarity of the voltage applied from the power source to the charge electrode with respect to the average voltage of the surface of the photosensitive drum after transferring is the same as a charging polarity of the toner at developing.

摘要翻译： 一种彩色打印机，包括：导电刷辊，用于在转印装置的下游位置和充电装置的上游接触感光鼓，其中至少部分残留调色剂在感光鼓上暂时转印后收集，并且收集的调色剂 被排出到感光鼓上，在除了感光鼓和刷辊的接触位置之外的位置处的面向刷辊的充电电极以及向充电电极施加电压的电源，其中施加的电压的极性 相对于转印后的感光鼓表面的平均电压，从电源到充电电极与显影时的调色剂的充电极性相同。

公开(公告)号：US20060083548A1

公开(公告)日：2006-04-20

申请号：US11028746

申请日：2005-01-05

申请人： Akira Hirota ,  Hiroaki Umemoto ,  Noritoshi Hagimoto ,  Kuniya Matsuura ,  Naotoshi Kawai ,  Kentaro Katori

发明人： Akira Hirota ,  Hiroaki Umemoto ,  Noritoshi Hagimoto ,  Kuniya Matsuura ,  Naotoshi Kawai ,  Kentaro Katori

IPC分类号： G03G21/00

CPC分类号： G03G21/0064

摘要： The color printer of the invention comprises a conductive brush roller contacting with a photosensitive drum at a position downstream of a transferring apparatus and upstream of a charging apparatus, collecting at least part of residual toner after transferring on the photosensitive drum temporarily, and expelling the collected toner onto the photosensitive drum, a charge electrode facing the brush roller at a position other than the contact position of the photosensitive drum and brush roller, and a power source for applying voltage to the charge electrode. The polarity of the voltage applied from the power source to the charge electrode with respect to the average voltage of the surface of the photosensitive drum after transferring is the same as a charging polarity of the toner at developing.

摘要翻译： 本发明的彩色打印机包括一个与感光鼓接触的导电刷辊，在转印装置的下游位置和充电装置的上游，在传感器上暂时收集至少部分残留的调色剂，并将收集的 调色剂到感光鼓上，在除了感光鼓和刷辊的接触位置之外的位置处的面向刷辊的充电电极和用于向充电电极施加电压的电源。 相对于转印后的感光鼓的表面的平均电压，从电源向充电电极施加的电压的极性与显影时的调色剂的充电极性相同。