Kyocera Document Solutions Inc.

Kyocera Mita Corporation

Yoshinobu Yoneima

Tamotsu Shimizu

Akihiro Watanabe

Sakae Saito

Yuji Kamiyama

Shizuka Okada

Yasuhiro Oishi

Masashi Fujishima

Yu Sasaki

Aiichiro Otana

Yasuhiro Tauchi

Chikara Ishihara

Yoshimi Shimizu

Tsuneo Oki

To restrict an angle change of a reflection surface of a reflection member that reflects a scanning light beam, an optical scanning device includes a first support portion that supports a reflection mirror at one point at an end in a longitudinal direction of the reflection mirror, a second support portion that supports the reflection mirror at a plurality of points at the other end, a reinforcement portion that reinforces a structure of the second support portion side of a housing in the longitudinal direction of the reflection mirror, compared to a structure of the first support portion side of the housing, one first fixing portion that is used to fix the housing to an image forming apparatus on the first support portion side, and a plurality of second fixing portions that are used to fix the housing to the image forming apparatus on the second support portion side.

Optical scanning device, image forming apparatus

A method for adjusting a position of a light beam sensor includes preparing a jig at a position coinciding with where the target surface is to be placed, the jig including a sensor mounting section at a reference position where a first beam is to enter, the first beam and a second beam being split from the light beam such that the first beam passes through one or more scan lenses and the second beam enters the light beam sensor, and mounting a reference sensor to the sensor mounting section, the reference sensor being configured to detect the first beam. The method further includes adjusting the position of the light beam sensor so as to synchronize detection timing of the second beam by the light beam sensor with detection timing of the first beam by the reference sensor.

Method for adjusting position of light beam sensor

When rotation speed of second rotator is greater than or equal to a threshold previously determined, first control portion causes first generation portion to generate a first potential difference that enables toner in a predetermined amount to be transferred from first rotator to second rotator, and causes second generation portion to generate a second potential difference that enables the toner in the predetermined amount to be transferred from second rotator to a electrostatic latent image. When the rotation speed is less than the threshold, second control portion causes first generation portion to generate a third potential difference that enables the toner in an amount exceeding the predetermined amount to be transferred from first rotator to second rotator, and causes second generation portion to generate a fourth potential difference that enables the toner in the predetermined amount to be transferred from second rotator to the electrostatic latent image.

Developing device and image forming apparatus

An optical scanning device includes a light source, a deflector, a scanning optical system, a BD sensor, and a half-silvered mirror. The light source emits a light beam. The deflector deflects a light beam emitted from the light source. The scanning optical system includes a scan lens and causes the deflected light beam to form an image on a photosensitive surface. The BD sensor detects a light beam. The half-silvered mirror splits the light beam into a first beam and a second beam. The first beam passes through the scan lens to enter the photosensitive surface. The second beam enters the BD sensor.

Optical scanning device and method for adjusting position of light beam sensor

A developing device includes: a container, a stirring member, a developing roller, a toner concentration detection section, a stirring plate, and an elastic member. The stirring plate is attached to the rotary shaft of the stirring member in a manner such as to be rotatable together with the rotary shaft, and has a tip part located in the radial direction at a predefined distance from the detection surface. The elastic member has elasticity, is attached to the stirring plate in a manner such as to surround a one-side surface, an another-side surface, and the tip part in a rotation direction of the stirring plate, has a sufficient length in the radial direction enough to abut the detection surface, and makes sliding-contact with the detection surface while rotating together with the stirring plate.

Developing device provided with toner concentration detection section and image forming apparatus provided with same

A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. In the roller main body, a boehmite layer has been formed on an outer circumferential surface of a base body that is made of a metal including aluminum, by a surface treatment by a boehmite method, and a resin coat layer has been formed on a surface of the boehmite layer, the resin coat layer being made of a resin material having electric conductivity.

Developing roller, developing device, and image forming apparatus including developing device

An image forming apparatus includes an image carrier, a developing device, a bias applying unit, a leakage detecting unit, a bias control unit and a leakage detection control unit. The developing device includes a magnetic roller and a developing roller. The magnetic roller carries a developer layer by being rotated. The developing roller receives the toner from the developer layer and supplies the toner to the image carrier. The leakage detection control unit performs a leakage detecting operation of detecting a value of an inter-peak voltage, at which the leakage occurred. The leakage detection control unit simultaneously starts the leakage detecting operation for a plurality of developing devices and performs the leakage detecting operations of the developing devices in which leakage simultaneously occurred while switching the leakage detecting operations one by one if the leakage simultaneously occurs in a plurality of developing devices at an inter-peak voltage.

Image forming apparatus with leakage detecting unit for detecting leakage

A mounting auxiliary member includes a rotary member and a stationary member. The rotary member is provided in an optical scanning device, and interposed between a light source holding member holding a light source and a head part of a screw. The rotary member has a first through hole through which a shaft part of the screw penetrates and is configured so as to co-rotate with the screw as the head part of the screw comes into contact with a peripheral edge part of the first through hole. The stationary member is interposed between the rotary member and light source holding member, has a second through hole into which the shaft part of the screw penetrating through the first through hole is movably inserted, and is configured to hold the rotary member while permitting the rotary member to slidably rotate.

Mounting auxiliary member and optical scanning device including the same

A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. A resin coat layer has been formed on an outer circumferential surface of the roller main body, the resin coat layer being made of a resin material having electric conductivity. A product of resistance component Rs [&#x3a9;] and electrostatic capacitance component Cs [F] in AC impedance Z of the roller main body is in a range from 2.79&#xd7;10to 6.77&#xd7;10, the AC impedance Z being obtained when an AC voltage of a predetermined frequency f is applied.

A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. The roller main body includes a resin coat layer that is formed on an outer circumferential surface of a base body that is made of a metal including aluminum, the resin coat layer being made of a resin material and having electric conductivity. An AC impedance Z obtained from an application of an AC voltage at a frequency in a range from 0.05 Hz to 100 Hz is equal to or higher than 100&#x3a9;, and a phase angle &#x3b8; satisfies a relationship of 0 rad&#x3c;&#x3b8;&#x3c;0.1 rad when a power factor is cos &#x3b8;=Za/Z.

The present invention is an optical scanning apparatus that is positioned and fixed to a metal frame of an image forming apparatus, in which a rotating polygon mirror being a deflection means and a drive motor rotationally driving the rotating polygon mirror are accommodated inside a housing made of resin. In the present invention, a bearing of the drive motor and a positioning member provided upright to the metal frame are inserted into and fitted with each other from opposite directions in a positioning boss formed in the housing, and the bearing is in contact with the positioning member.

Optical scanning apparatus and image forming apparatus provided with the same

An optical scanning apparatus includes a housing, light deflector, first optical system and reinforcement member. The housing includes a peripheral wall and a partitioning portion to divide an inner side of the peripheral wall into first and second portion. The partitioning portion includes a first hole to cause the first portion to communicate with the second portion to form an optical path. The light deflector mounted in the first portion has a rotatable polygon mirror to perform deflection scanning of scanning light beams emitted from light sources and a drive unit to drive the rotatable polygon mirror to rotate. The first optical system mounted at least in the first portion causes the scanning light beams reflected from the rotatable polygon mirror to return towards the first hole. The reinforcement member mounted on a surface facing at least the second portion on the partitioning portion reinforces the housing.

Growing community of inventors

Osaka, Japan

Yoshinobu Yoneima