摘要:
A controller including an analog circuit for controlling a power source of an apparatus and a digital circuit including a CPU for performing sequence control for the apparatus and for controlling the analog circuit. The analog circuit having a comparator for comparing an output of the power source with a reference signal to output a signal for controlling the power source. Both the analog circuit and the digital circuit are integrally formed on a chip.
摘要:
A power source apparatus includes a transformer having a plurality of paired winding portions of primary and secondary windings wound around cores divided by a gap, a driver, connected to the primary winding of the paired winding portion, for switching energization of the primary winding of the transformer to generate a secondary winding voltage, and a selector for selectively driving one of the plurality of paired winding portions.
摘要:
A power source apparatus suitable for a high voltage power source of an electrophotographic type copying apparatus or a printer comprises: a first DC power source which can vary an output; a second DC power source which can vary an output and whose output terminal of the same polarity as that of one output terminal of the first DC power source is connected to such one output terminal; connecting means for connecting another output terminal of the first DC power source and another output terminal of the second DC power source to a load; control means for making operative and controlling the first and second DC power sources in accordance with an output of the power source apparatus; and detecting means for detecting an output voltage or an output current of the power source apparatus.
摘要:
A present invention is provided with a laser light source having a plurality of laser elements capable of scanning a plurality of lines in parallel in a sub-scanning direction at a second resolution, which is higher than a first resolution of an image to be formed in a main scanning direction, a multiplexer and a laser driver that set a scaling ratio of an image in the sub-scanning direction in response to the first and second resolutions and an image size for image forming, and perform control so as to select and drive any of the plurality of laser elements of the laser light source in response to the scaling ratio that has been set, and an image forming unit that forms on a print medium an image of lines scanned using laser elements driven by the laser driver.
摘要:
a circuit for driving a semiconductor laser including a semiconductor integrated circuit, which controls the drive of the semiconductor laser, and is connected to one end of the semiconductor laser. Moreover, the driving circuit incorporates a first power source +Vcc that supplies by way of the semiconductor integrated circuit a drive voltage to one end of the semiconductor laser and a second power source −Vcc, which is connected to the other end of the semiconductor laser and supplies a drive voltage to the other end. Furthermore, the drive circuit incorporates a voltage clamp circuit, connected to a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit, for adjusting the electric potential of the connection terminal.
摘要:
A charging device includes a member to be charged; a charging member, provided connectable to the member to be charged, for charging the member to be a power source for supplying the oscillating voltage to the charging member; a constant voltage element connected electrically in parallel with the portion for generating the oscillating voltage.
摘要:
An image forming apparatus includes: a photosensitive drum; a charging unit which is brought into contact with the drum and charges it; a developing unit for obtaining a visible image from an electrostatic latent image formed on the drum; a charge high voltage generation circuit for supplying an output which is obtained by multiplexing a high AC voltage with a high DC voltage with the charging unit; a development high voltage generation circuit for supplying an output which is obtained by multiplexing a high AC voltage with a high DC voltage to the developing unit; and a sync circuit for synchronizing a high voltage alternating current of the charge high voltage generation circuit and a high voltage alternating current of the development high voltage generation circuit. A ratio of the frequencies of the high voltage alternating currents of the development high voltage generation circuit and the charge high voltage generation circuit is set to an integer. The high AC voltages are derived from the signals having an integer frequency dividing ratio which are obtained by frequency dividing the same clock signal.
摘要:
A circuit for driving a semiconductor laser including a semiconductor integrated circuit, which controls the drive of the semiconductor laser, and is connected to one end of the semiconductor laser. Moreover, the driving circuit incorporates a first power source +Vcc that supplies by way of the semiconductor integrated circuit a drive voltage to one end of the semiconductor laser and a second power source −Vcc, which is connected to the other end of the semiconductor laser and supplies a drive voltage to the other end. Furthermore, the drive circuit incorporates a voltage clamp circuit, connected to a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit, for adjusting the electric potential of the connection terminal.
摘要:
A laser exposing apparatus has a first laser source emitting a first laser beam, a second laser source emitting a second laser beam shorter in wavelength than the first laser beam, and an optical device for directing the first laser beam and the second laser beam to a photosensitive member. The second laser beam has a longer optical path length to the photosensitive member than the first laser beam.
摘要:
An image formation device changes the rotational rate of a polygon motor, i.e. the main-scanning rate, and selects one of pulse width conversion tables when an image formation is performed multiple times on a single sheet of transfer paper. The changing of the main-scanning rate is for preventing inconsistent sizes between a first recorded image and a second recorded image caused by shrinkage of transfer paper. The pulse width conversion tables allow the pulse widths to be modulated.