Canon Kabushiki Kaisha

Kowa Company Limited

Waseda University

Akihiko Uchiyama

Tatsuya Kobayashi

Yoshiro Saito

Tetsuya Kobayashi

Naoki Enomoto

Haruo Fujii

Hiroshi Sasame

Masaki Shimomura

Yoshiki Kudo

Toshiaki Miyashiro

Tomoaki Nakai

Hiroshi Kita

Yoichiro Maebashi

Hisashi Nakahara

Youichirou Maebashi

Takahiro Nakase

Motoi Katoh

Tatsuhiko Hayakawa

Akihiko Takeuchi

Kazuhiro Funatani

Tsuguhiro Yoshida

Takaaki Tsuruya

Kenta Kamikura

Sunao Takeda

Yuzo Seino

Go Shindo

Takao Aoki

Tohru Saito

Motoi Kato

Yusuke Hirota

Kenji Yanashima

Masahiro Suzuki

Satoshi Shimizu

Hiroyuki Munetsugu

Takashi Kenmoku

Shinsuke Kobayashi

Masaru Shimura

Masataka Mochizuki

Takehiko Suzuki

Ken Nakagawa

Takashi Kawana

Akira Ito

Hideyuki Yano

Michio Uchida

Kazuhisa Kemmochi

Toshihiko Takayama

Toshihiko Ochiai

Hiroyuki Yamazaki

Satoshi Nakashima

Norihito Naito

Tetsuya Sano

Takaaki Akamatsu

Hiroaki Kawakami

Tomonori Shida

Akihiro Fujita

Shuji Saito

Masao Nakano

Masatake Usui

Hitoshi Furukawa

Toshifumi Moritani

Itaru Yoshizawa

Yuya Kojima

Makoto Nakai

Go Taguchi

Takuro Yokoyama

An image forming apparatus includes an endless image bearing member, a toner image forming portion, a light source, a detecting portion, a removing member, and a controller. The controller carries out control so that first measurement for detecting reflected light by the detecting portion by irradiating toner, supplied to a first region detectable by the detecting portion, with the light from the light source and second measurement for detecting the reflected light by the detecting portion by irradiating a surface of the image bearing member with light from the light source are made executable. In a case that the second measurement is executed, the controller carries out control so that the toner is supplied to the nip in a second region different from the first region.

Image forming apparatus

An image forming apparatus, configured to operate in first and second modes of which color gamut is different from each other, includes an exposure unit configured to expose a photosensitive drum; a developing roller configured to form a toner image; a detection unit configured to detect density of the toner image transferred to an intermediate transfer member; and a controller configured to adjust the density based on a value of input image data. A dithering process for the controller's controlling of the exposure unit is different depending on whether the operation is in the first mode or the second mode, and in at least a part of the input image data, the density of the toner image formed by the dithering process in the first mode is higher than the density of the toner image formed by the dithering process in the second mode.

In an image forming apparatus, a fixing member has a surface layer having conductivity. A developer is a toner having a toner particle including a binder resin, a reactant of a polyhydric acid and a compound containing a group 4 element is present on a surface of the toner particle, and Tv/Fv&#x3e;100 is satisfied where Tv represents a volume resistivity upon being unfixed, and Fv represents a volume resistivity after fixing. A bias applying unit can selectively apply a bias of a positive polarity and a bias of a negative polarity, and applies a bias of the same polarity as the charged polarity of a filler included in a recording material when the recording material passes through a fixing nip portion, and when the recording material does not pass through the fixing nip portion, respectively.

An image forming apparatus includes a developing roller configured to develop an electrostatic latent image on a photosensitive drum to form a toner image; a belt onto which the toner image is transferred; a detection unit configured to detect a density of an image for detection formed on the belt; and a controller configured to perform hue adjustment based on a detection result of the detection unit. The image forming apparatus performs image formation in a second mode using a color gamut different from a color gamut in a first mode, and the controller obtains a lookup table, which indicates a correlation between image data to be used and input image data in the second mode, based on the detection result in the first mode and a correlation of density between the first mode and the second mode.

Image forming apparatus operable in modes having different color gamuts

A toner comprising a toner particle, wherein the toner particle includes a binder resin, where a volume resistivity &#x3a9;&#xb7;cm of an unfixed solid image on a recording material on which the solid image has been formed using the toner at a toner laid-on level of 0.4 mg/cmis denoted by Tv, and a volume resistivity &#x3a9;&#xb7;cm of the solid image after fixing by applying heat and pressure to the recording material is denoted by Fv, Tv/Fv&#x2265;8 is satisfied.

Toner

The colorimetry apparatus includes a light source for emitting light to a surface of a detected object, a diffraction grating for spectrally separating, for each wavelength, the light emitted from the light source and reflected by the detected object, and a line sensor including multiple pixels, for receiving the light, which is spectrally separated by the diffraction grating, for the each wavelength by the multiple pixels. The light source and the line sensor are arranged on the common substrate.

Colorimetry apparatus and image forming apparatus

In a first image formation mode, an image is formed with a first development contrast Cand a specific dot pattern is formed with a second development contrast C, which is lower than the first development contrast C; in a second image formation mode, an image is formed with a third development contrast Cand a specific dot pattern is formed with a fourth development contrast C, which is lower than the third development contrast C; and when &#x394;C(=C/C) denotes a ratio between the second development contrast Cand the first development contrast C, and &#x394;C(=C/C) denotes a ratio between the fourth development contrast Cand the third development contrast C, &#x394;C&#x3c;&#x394;Cis satisfied.

An image forming apparatus includes a CPU configured to change a parameter value used to control a developer bearing amount and form a plurality of patches for different parameter values changed, and a color sensor configured to measure the plurality of patches thereby acquiring color information thereof. The CPU detects, from values of color information of the plurality of patches, a value of the color information at which a change greater than or equal to a predetermined threshold value occurs, and the CPU sets a parameter used in forming an image based on the detected value of color information.

Image forming apparatus capable of setting a parameter used in forming an image based on a detected change in a value of tint

An image forming apparatus includes a controller capable of executing a normal mode in which an electrostatic image formed on an image bearing member is developed by setting a peripheral velocity ratio of a developer bearing member relative to the image bearing member to a prescribed peripheral velocity ratio, and a color gamut enlargement mode in which a color gamut of an image to be formed on a recording medium is enlarged as compared to the normal mode by setting the peripheral velocity ratio of the developer bearing member relative to the image bearing member to a larger peripheral velocity ratio than the peripheral velocity ratio in the normal mode, wherein the controller identifies image color gamut information included in image data and forms an image by selecting the normal mode or the color gamut enlargement mode in accordance with the image color gamut information.

Image forming apparatus having image color gamut enlargement mode

A color measurement device includes a light source for illuminating an object with light; a dispersing portion for spectrally dispersing light emitted and reflected by the object; a light receptor for receiving the light dispersed by the dispersing portion; and a controller for effecting color measurement based on a result of light reception of the light receptor from the object which is an image formed on a recording material; wherein the emitted light has a first intensity of light in a first wavelength range and a second intensity lower than the first intensity in a second wavelength range, and wherein the controller deduces a value relating to color measurement for the second wavelength range on the basis of a result of light reception of the light receptor for the first wavelength range.

Color measuring apparatus, image forming apparatus and color measuring method

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Mishima, Japan

Akihiko Uchiyama