Ricoh Company, Ltd.

Mitsuru Shingyouchi

Takao Inoue

Takuro Sekiya

Yasuhiro Sato

Toshiyuki Furuta

Takashi Kitaguchi

Norihiko Murata

Etsuko Fujisawa

Takashi Kimura

Takayuki Yamaguchi

Masami Kadonaga

Eiko Suzuki

Makoto Obu

Tetsuro Hirota

Yoshio Watanabe

Michio Umezawa

Mikio Ohashi

Toshihiro Takesue

Shuji Motomura

Takesada Hirose

Hideki Ohtsuki

A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.

Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement

Pen-shaped handwriting input apparatus using accelerometers and

In a surface potential sensing device, a sense electrode electrically independent of an object is located at a preselected distance from the object for sensing the surface potential of the object Electrostatic capacitance between the object and the sense electrode is varied in order to detect two or more variables in a potential signal output from the sense electrode. The potential detection signal is corrected on the basis of the two or more variables.

Surface potential sensing device

An ink jet recording apparatus includes a recording head for ejecting droplets of ink and a driving circuit for driving the recording head. The recording head includes a base, a plate on which a plurality of openings are formed; an ink chamber to be filled with ink being formed between the base and the plate; and heater elements, provided in the ink chamber so as to face the openings of the plate, each of which heater elements supplies heat energy to ink adjacent thereto so that the air bubble is generated on each of the heater elements and so that the air bubble grows toward a corresponding one of the openings. An area of each of the openings of the plate is greater than an area each of the heater elements. When the driving circuit activates each of the heater elements, a droplet of ink is ejected due to the air bubble from the corresponding one of the openings of the plate.

Ink jet recording apparatus

An ink jet recording apparatus is provided with an ink jet recording head which includes at least one nozzle for ejecting ink, a heating layer, and a ground electrode and a plurality of control electrodes electrically connected to the heating layer, and a thermal energy action part, formed in the heating layer in correspondence with the nozzle, for heating the ink and causing a state transition so as to eject the ink from the nozzle when a voltage is applied across at least one pair of the ground electrode and the control electrode. The ground electrode electrically connects to the heating layer within a region of the thermal energy action part, and the control electrodes electrically connects to the heating layer outside the region of the thermal energy action part.

Ink jet recording method and apparatus having drop size control by using

An ink jet recording head assembly includes: a base member having a plurality of enclosures, a top of each of the enclosures having an opening; a mechanism for supplying ink to each of the enclosures via the opening at the top thereof and for maintaining the ink at a predetermined depth; and a heater element which is provided in each of the enclosures under the ink supplied via the opening, the heater element heating the ink in each of the enclosures so that a bubble is generated in the ink; wherein an ink drop is jetted from a surface of the ink due to the bubble generated in the ink.

Ink jet recording head assembly

A liquid jet recording head includes a heater element which comprises a heat reserve layer, a resistance layer formed on the heat reserve layer, electrodes electrically connected to the resistance layer, the resistance layer generating heat when an electrical current is supplied to the resistance layer via the electrodes, and a protection layer stacked on the resistance layer, the heat generated by the resistance layer being transmitted to the liquid via the protection layer. The heater element has a special part in which a width of the resistance layer is greater than that thereof in a normal part of the heater element, the special part including a position where the bubble disappears, so that a electric current density in the resistance layer in the special part is less than that thereof in the normal part.

Liquid jet recording head with selected bubble disappearance position

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Yokohama, Japan

Mitsuru Shingyouchi