Ricoh Company, Ltd.

Takuroh Kamiya

Koichi Kudo

Ryuuichi Mimbu

Yoshihiro Sakai

Toshiyuki Andoh

Katsuya Kawagoe

Junya Takigawa

Mitsuru Takahashi

Yasufumi Yamada

Mikio Kamoshita

An optical encoder includes a light emitting unit that emits parallel light onto a plurality of marks that are arranged on an object such as a rotor or a belt, at a predetermined interval in a moving direction of the object, and a light receiving unit that receives light modulated by the marks. The parallel light is generated by a collimating lens.

Optical encoder, motor driver and image forming apparatus

An image forming apparatus includes a rotating member, a drive mechanism, a scale, and a scale reading mechanism. The rotating member is configured to carry an image. The drive mechanism is configured to rotationally drive the rotating member. The scale is provided around an entire perimeter of a surface of the rotating member. The scale reading mechanism is configured to read the scale and arranged in a region where the rotating member is prevented from wavering or being distorted. A rotating drive of the rotating member is controlled based on information read by the scale reading mechanism.

Method and apparatus of image forming capable of suitably controlling transfer characteristic

A belt apparatus having an endless belt which is wound around and movably driven by a plurality of support rollers. The speed fluctuations of the endless belt due to the variations in thickness of the endless belt are prevented. A driving apparatus for driving the endless belt has a driving roller and an opposite roller facing with each other across the endless belt, and a driving motor for driving the driving roller, the driving roller and the opposite roller being in pressure contact with each other only at both end parts in their axial direction via the endless belt and the pressure contact part forming a plane.

Belt apparatus and image forming apparatus having the same

An image forming apparatus including a rotary member having an image formation area, and a scale located at a position outside of the image formation area and on an inner circumference of the rotary member. Also included is a drive device configured to drive the rotary member, a developing device configured to develop an image on the image formation area of the rotary member, and a transfer device configured to transfer the image on the image formation area to a recording sheet. Further included is a sensor configured to detect the scale on the rotary member and to output a signal corresponding to the detection of the scale.

Image forming apparatus including rotary member speed detection mechanism

An image forming apparatus including a drum, an optical scanning mechanism, a development mechanism, an intermediate transfer member, movement detecting mechanisms, and a controller. The intermediate transfer member is rotated in synchronism with a rotation of the drum and receives color toner image multiple times to form thereon a composite color toner image including multiple images of different color toners overlaying one to another. The movement detecting mechanisms detect respective movements of the drum and the intermediate transfer member. The controller controls respective rotations of the drum and the intermediate transfer member with results of respective detection performed by the movement detecting mechanisms.

Growing community of inventors

Tokyo, Japan

Takuroh Kamiya