Minolta Camera Kabushiki Kaisha

Minolta Company, Ltd.

Konica Minolta Medical and Graphic, Inc.

Toeisangyo Co., Ltd.

Masaki Asano

Akihito Ikegawa

Izumi Osawa

Shuji Iino

Hideo Hotomi

Masashi Yamamoto

Keiko Nagayasu

Toshiya Natsuhara

Takamasa Ueda

Kenzo Tanaka

Kusunoki Higashino

Yasuhisa Fujii

Shoichi Minato

Kazuchika Sato

Satoru Hirose

Noriko Yoshida

An array-type ultrasonic vibrator according to the present invention has an acoustic matching layer that has a plate-like body made of a material having a lower acoustic impedance than a plurality of piezoelectric elements. Signal wiring is formed on the plate-like body of the acoustic matching layer. Accordingly, for this array-type ultrasonic vibrator, the signal wiring can be easily formed without using additional components.

Array-type ultrasonic vibrator

An ink jet printer includes heads for jetting ink of yellow, magenta, cyan and black, and a head for jetting ink lower in tone than the aforementioned ink. The voltage applied to a head can be changed to change the size of a dot to be printed. Tone control can be provided depending on the tone of ink and dot size to improve image quality.

Image forming apparatus

Image processing apparatus capable of high-quality image formation

The present invention relates to an ink jet recording apparatus using an electrostatic actuator. The present invention provides an ink jet recording apparatus comprising a resilient oscillating plate that is facing a pressure chamber that communicates with a nozzle, a first electrode provided on said oscillating plate, a second electrode opposing said first electrode across a space, and a voltage application unit that applies across the first electrode and the second electrode a first voltage that causes the ink in said pressure chamber to be ejected and a second voltage that does not cause the ink to be ejected, wherein said second voltage is applied a specified time prior to the application of the first voltage, so that the residual electrical charges on the first electrode and/or the second electrode can be positively discharged.

Ink jet recording apparatus and drive unit and method for ink jet head

In order to provide an ink jet printer achieving a constant printing quality regardless of the type of sheet to be used, a switch for selecting the type of sheet for the printer is provided. The type of sheet to be used is determined according to the state of the switch. Based on the result of the determination, the diameter of an ink drop emitted from a nozzle is changed. Since the degree of spreading of ink as well as the degree of absorption of ink differ depending on the type of sheet, the image quality after printing can be made constant regardless of the type of sheet by changing the diameter of ink drops.

Ink jet printing apparatus capable of printing in the same quality regardless of sheet type

An inkjet printing apparatus having a print head and a control system to control the discharge of variable size ink drops from the print head. The control system controls a print operation to divide the printing of an image into steps, wherein at least a first step includes the printing of dots having diameters within a specified range and at least a second step includes the printing of dots having diameters within another specified range.

Inkjet printing device

The present invention relates to an ink for ink-jetting containing at least a coloring material, water soluble organic solvent and water, comprising:

Ink for ink-jet recording containing specified glycol derivatives

The present invention relates to an ink for ink-jetting, comprising: a coloring material, alkylene oxide adduct of acetylene glycol, water, and polyethyleneimine, alkali metal ethylenediaminetetraacetate or a mixture of NaOH with at least one compound selected from the group consisting of NaHCO.sub.3 and Na.sub.2 B.sub.4 O.sub.7.

Ink for ink-jet recording containing alkylene oxide adduct of acetylene

A charging device including a charging member which is in contact with or minutely spaced from a surface of a photosensitive member, device for applying a constant voltage to the charging member, and a controller for controlling the voltage applied to the charging member when a current flowing from the charging member to the surface of the photosensitive member exceeds a predetermined value.

Charging device for charging the surface of a photosensitive member in

A charging device and method in which a charging member, for example, of a brush, plate, film or roller type, for charging a charge-receiving member is disposed at a predetermined distance from the charge-receiving member. The distance is adjusted at not greater than a discharge start distance when the discharge is started and is adjusted at greater than the discharge start distance and less than a discharge stop distance after the discharge is started. The discharge start distance is the distance at the start of discharge when two electrodes are in close proximity as a voltage is applied, and the discharge stop distance is the distance directly before a stable discharge stops when two electrodes are separated while in state of discharge.

Charging device and method for charging a charge-receiving member by a

A contact charging device which charges a rotatable photoreceptor. The contact charging device has a support member provided adjacently to the photoreceptor, first and second films each one end portion of which is supported by the support member. Each free end portion of the first and second films is in contact with the surface of the photoreceptor. The second film is positioned on downstream side from the first film with respect to a rotational direction of the photoreceptor. In the above charging device, a resistance value of the first film is higher than a resistance value of the second film.

Contact charger and image forming apparatus provided with same

An image forming apparatus provided with a contact charging device, in which an electrically conductive member contacts a surface of an electrostatic latent image carrier for charging the surface, wherein at least impurity atom selected from the group consisting of elements of Group IA, II, VI and VII of the periodic table is adhered to the electrically conductive member, and a total content of the impurity atom is in a range from 0.05 wt % to 0.45 wt% with respect to all atoms including the impurity atom and atoms forming the electrically conductive member.

An electrically conductive member of an image forming apparatus

A contact charging device for charging an outer surface of an electrostatic latent image carrier in contact therewith which has a charging member at least partly in contact with the electrostatic latent image carrier, the portion of the charging member in contact with the electrostatic latent image carrier being formed by a layer containing a copolymer of an olefin-type vinyl monomer and a fluorine-contained monomer, and a power supply for applying a charging voltage to the charging member.

Charging device for charging outer surface of photosensitive member

A contact charger in an electrophotographic image forming apparatus for electrostatically charging a photosensitive, latent image support surface of a rotatably supported photosensitive drum in contact therewith. The contact charger comprises a generally elongated carrier and a charging member carried at a first side edge by the carrier. This charging member has a second side edge opposite to the first side edge which is held in sliding contact with the photosensitive surface over a predetermined contact distance. The charging member has a curved surface of a radius of curvature of 0.02 to 1.0 mm at a side edge portion thereof at which contact of the charging member with the photosensitive surface terminates. A power source for applying a voltage to the charging member is also employed.

Contact charger having a curved surface

A contact member for controlling an electrostatic state of a surface of a chargeable member includes electrically conductive base members, and flame retardant material included in the base members.

Growing community of inventors

Amagasaki, Japan

Masaki Asano