Canon Kabushiki Kaisha

Juun Horie

Takeshi Yamamoto

Manami Haraguchi

Kenta Kubo

Tomoaki Miyazawa

Hirokazu Usami

Yoshihiko Iwase

Yoshinobu Baba

Koh Ishigami

Hiroki Uchida

Osamu Sagano

Tomohito Ishida

Katsuhiro Watanabe

Shuji Moriya

Riuma Takahashi

Jumpei Shirono

Kazuo Uchida

An apparatus includes an obtaining unit configured to obtain, using an optical coherence tomography, an analysis map for a disk and an analysis map for a macular area, which are analysis results of three-dimensional data obtained by capturing an image of a region of a fundus of a subject's eye that includes the disk and the macular area, and a control unit configured to cause a display unit to display side by side a two-dimensional image of the region including the disk and the macular area, the analysis map for the optic disk, and the analysis map for the macular area.

Image processing apparatus, image processing method, and storage medium

An image forming apparatus includes a photosensitive member, a first developer carrying member for carrying a developer comprising toner and a carrier for developing an electrostatic image formed on the photosensitive member, and a second developer carrying member for carrying the developer received from the first developer carrying. The second developer carrying member is disposed downstream of the first developer carrying member with respect to a rotational direction of the photosensitive member. In addition, a voltage source applies a developing bias voltage to the first developer carrying member and second developer carrying member, and a driving device rotates the first developer carrying member at a peripheral speed higher than that of the photosensitive member and rotates the second developer carrying member at a peripheral speed which is higher than that of the photosensitive member and which is lower than that of the first developer carrying member.

Image forming apparatus

An image forming method using a two component developing system is provided in which a print speed is not less than 300 mm/s, a peak-to-peak voltage of an AC component in a developing bias is not more than 1.3 kV, a sufficient image density can be ensured, and a recorded image having a small amount of magnetic carrier remaining on the image and having high image quality can be obtained. A magnetic carrier that forms a two component developer contains a magnetic core and a resin. The magnetic core is a ferrite containing Sr and Ca inside thereof at the same time, having a small crystal grain diameter, a high density crystal-grain boundary structure, and an extremely large capacitance of the grain boundary. Use of the ferrite can provide the above method.

Image forming method

A duty ratio Du (%), denoted by (T/(TT))&#xd7;100, is in the range of 60&#x2266;Du&#x2266;80; a magnetic carrier has a resistivity &#x3c1; which decreases in accordance with an increasing electric field strength, and a relative dielectric constant &#x2208; which increases in accordance with an increasing electric field strength; a product of a time constant &#x2208;&#x2208;&#x3c1;(s) of electric charge decay in an electric field strength Edecided by a second peak voltage Vand a dark potential V, and an electric field strength Esatisfies a relation of 20&#x2266;&#x2208;&#x2208;&#x3c1; E(s&#xb7;V/cm); and a time constant &#x2208;&#x2208;&#x3c1;(s) and a relative dielectric constant &#x2208; in an electric field strength E, which is decided by a first peak voltage Vand a bright potential V, satisfy the following relations: &#x2208;&#x2208;&#x3c1;(s)&#x2266;6.0&#xd7;10, and 30&#x2266;&#x2208;.

Image forming apparatus generating electrostatic forces in first and second directions with a predetermined duty ratio

An image forming apparatus includes a developer carrying member to which a developing bias is applied. A frequency f of a developing bias waveform, a developing area Swhich is a time-integrated value of a difference between a voltage value of the developing bias and a solid electrostatic image potential VL in a developing period of the developing bias, a collecting area Swhich is a time-integrated value of a difference between the voltage value of the developing bias and VL in a collecting period of the developing bias, and a developing contrast value Vcon are used for defining a range of a value of the developing bias frequency f, a range of a value of a voltage change rate &#x3b1; at VL during transition of the developing bias voltage value from a developing-side voltage to a collecting-side voltage, and a range of a value represented by the formula:{(S1&#x2212;1.28&#xd7;S2)&#xd7;f/Vcon}&#xd7;exp(&#x2212;2.0&#xd7;10&#xd7;f/Hz).

An image forming apparatus includes a photosensitive drum to which an electrostatic image is formed and a developing sleeve carrying a developer including toner carrier. An alternating voltage is applied to the sleeve to form an alternating electric field between the sleeve and the drum to develop the electrostatic image with the developer. A relation |K|&#x3c;|K| is satisfied, where K: a slope at an electric field intensity Ed=|(Vp&#x2212;VL)/D|, K: a slope at an electric field intensity Eb=|(Vp&#x2212;VL)/D|, VL: a potential [V] of the electrostatic image at which a maximum density is obtained, Vp: a peak potential [V] that provides a potential difference to move the toner toward the drum, Vp: a peak potential [V] that provides a potential difference to move the toner toward the sleeve, and D: a closest distance [m] between the drum and the sleeve.

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Tokyo, Japan

Juun Horie