Oki Data Corporation

Oki Electric Industry Co., Ltd.

Oki Data Corportion

Osamu Kunimori

An image formation apparatus according to an embodiment may include: a fixation device including a first heater and a second heater whose electric power is smaller than the first heater; first and second switches to supply a power supply signal to the first and second heaters; and a heater controller. The heater controller: turns on the second switch at a first timing; turns off the second switch at a second timing at which a first length of time equal not less than a predetermined time length is elapsed from the first timing; turns on the first switch at a third timing after the second timing; and turns on the second switch at a fourth timing at which a second length of time not less than the predetermined time length is elapsed from the third timing.

Image formation apparatus and heater control method

An the image formation apparatus according to an embodiment may include: a heater that heats a medium on which a developer image is formed; a controller that controls the heater; a first path through which an input voltage, which is an alternating current (AC) voltage input from an external power supply, is converted to a predetermined voltage, and the predetermined voltage is supplied to the controller; a second path which is branched from the first path and through which the input voltage is supplied to the heater; a control element which is connected to the second path and controls on/off switching of the heater in response to an instruction from the controller; and a disconnection part that disconnects the second path when the input voltage that has a square wave is input.

Image formation apparatus

An image forming apparatus includes a first image forming unit that develops a first latent image using a first developer so that a first developer image is developed with the first developer, a second image forming unit that develops a second latent image using a second developer, which is lower in saturation or higher in light-permeability in comparison to the first developer, so that a second developer image is developed with the second developer, a transfer part that transfers the first developer image and the second developer image to a medium, and a control part that controls an amount of the second developer used to develop the second developer image according to a type of the medium.

Image forming apparatus

An image formation apparatus includes: a calculation section which calculates, based on print data, a distribution of a developer density that is a developer quantity per unit region to be transferred to a transfer object in an image formation; a correction section which performs a correction of the print data according to the distribution of the developer density calculated by the calculation section to additionally transfer a low chroma developer image to the transfer object in the image formation together with a developer image to be formed based on the print data, chroma of the low chroma developer image being lower than chroma of the developer image based on the print data; and an image formation section which performs the image formation based on the print data after the correction performed by the correction section.

Image formation apparatus, image processing apparatus, and image formation method

An image recording apparatus capable of correctly determining a color shift value between recording heads of different color. The image recording apparatus has each recording head print two types of patches as patterns on a conveyance belt and has a reflection intensity detection unit read reflection intensities of the two patches to determine the color shift value and correct the color shift value so as not to include a position shift value between a reference position and a position where the actual reading has started. The image recording apparatus for recording a pattern to a color image conveyance medium and reading the recorded pattern comprises a feeding unit that feeds the color image conveyance medium along a feeding path, a first image forming unit that records the pattern to the color image conveyance medium in a first color, a second image forming unit that records the pattern to the color image conveyance medium in a second color, a reflection intensity detection unit that reads a reflection intensity of the pattern, an image formation control unit for calculating from the reflection intensity a color shift value of the second image forming unit with respect to the first image forming unit, wherein the first image forming unit records a first pattern of a first interval and the second image forming unit records a second pattern of a second interval overlapping the first pattern so that a first patch having the first pattern and the second pattern overlapped is formed, and wherein the first image forming unit records a third pattern of the second interval and the second image forming unit records a fourth pattern of the first interval overlapping the third pattern so that a second patch having the first pattern and the second pattern overlapped is formed.

Color image recording apparatus for determining a color shift value between image forming units

A fixing apparatus includes a magnetic flux generator that generates a magnetic flux. A heater is disposed in the magnetic flux and generates heat by electromagnetic induction to heat a toner image on a medium. A cylindrical selector selects a dimension of the heater in accordance with the width of the medium that extends in a traversing direction perpendicular to the advance direction of the medium. The heater may include at least two heater elements having different lengths that extend in directions substantially perpendicular to the advance direction. The selector selects one of the heater elements in accordance with the width of the medium. The heater may be trapezoidal and mounted on a circumferential surface of the selector, having a width that monotonically increasing in a circumferential direction of the selector. The cylinder rotates to a position where the heater just covers a toner image on the medium.

Growing community of inventors

Tokyo, Japan

Osamu Kunimori