Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yuji Toyomura

Takafumi Hamano

Seiichiro Hiratsuka

Tetsuroh Nakamura

Yuzo Kawano

Tetsuro Nakamura

Kenichi Masumoto

Akira Gyoutoku

Masaya Shimada

Masakazu Mizusaki

Shoichi Kitagawa

Akira Gyotoku

Ken-ichi Masumoto

Hideki Maruyama

Norihide Satoh

Shinya Yamamoto

Masanobu Narazaki

Keiichi Nakashima

An image forming apparatus includes a light source provided with converting structure for converting an advancing direction of light emitted from the light source, whereby a direction in which the light source is disposed can be determined regardless of a direction in which light is emitted. The advancing direction of the light emitted from a light emitting element is converted into a direction in which light transmitting structure can transmit the light, so that a luminous intensity on a photosensitive drum can be increased. The light source is designed so as to increase a light emitting area of the light emitting element and condense light emitted therefrom. The light emitting element utilizes a flat luminous unit, which is combined with a light transmitting structure in one optical piece.

Light source for image writing apparatus and production method for light source

Providing an exposure unit using an organic electroluminescence element with a large emitted light quantity. The organic electroluminescence element has, on a substrate, an anodeacting as a hole injection electrode, a cathodeacting as an electron injection electrode, a first and second emission layersandeach having a light emission region, and a charge generation layerinjecting electrons into the light emission layerlying close to the anodeand injecting holes into the light emission layerlying close to the cathode, these layers being arranged between the anodeand the cathode

Organic electroluminescence element and an exposure unit and image-forming apparatus both using the element

An image reading apparatus for reading a original line by line, by moving the line image sensor in a direction orthogonal to the line, in which the line sensor is displaced in the line direction in each line to read the image of the original in a checkered pattern of pixels, and for interpolating a pixel in spaces of the said checkered pattern, plural interpolation candidate values for the pixel are determined and one of them is selected according to surrounding pixel values of the said pixel position to be interpolated, thereby reproducing edge portion of the original accurately.

Image reading apparatus

An encoder produces a plurality of different phase signals. A detecting unit detects all edges of the plurality of different phase signals from the encoder. A central processing unit (CPU) measures edge intervals of edges succeeding with respect to time. A first process is for obtaining a control target value on the basis of a value measured by the CPU, and a second process is for controlling the drive speed of the drive source on the basis of the result of comparing the value measured by the CPU and the control target value.

Motor velocity controlling method employing detection of all side edges

An image reader, which is capable of reading tone effects of a document precisely and can be miniaturized, includes a document glass, a light source for illuminating the document, an optical system for image formation of a reflected light from the document, an image reading section, a carriage, a driving motor for driving the carriage, a vertical scanning white reference board disposed outside an area, in which the document is mounted, within a range of reading and at least arranged apart from the carriage in a direction toward the document glass, a vertical scanning shading correction arrangement for correction to keep an image signal level at a constant level, and a locating section for locating a position in a horizontal scanning direction of the vertical scanning white reference board, whereby tone effects of the document can be read precisely and the image reader be miniaturized.

Image reader

An image forming device which perform tone reproduction of a by changing the size of dots according to input image data comprising a plurality of pixels, each of which has an image density. A block partitioning portion partitions the input image data into blocks, each which has a predetermined number of pixels and each of the pixels having a predetermined position within each of the blocks. A tone modulation portion determines priorities corresponding to predetermined positions of the pixels within each of the blocks and changes the size of the dots according to the image densities of the pixels within the block. The tone modulation portion increases the size of the dots corresponding to the pixels in such a manner that the size of one of the dots corresponding to one of the pixels is larger than that of another one of the dots corresponding to another one of the pixels having a lower priority than one of the pixels but having the same image density. The degradation of resolution and moire effects are avoided.

Image forming device for enhancing tone reproduction by changing dot size

An electrophotographic apparatus equipped with a photosensitive device rotatable which is responsive to exposure light so as to allow formation of a toner image thereon and an intermediate transfer device rotatable which is brought into contact with the photosensitive device so that the toner image formed on the photosensitive device are transferred onto a surface of the intermediate transfer device. The photosensitive device has a reference mark indicative of a predetermined position in its rotational direction and the intermediate transfer device also has a reference mark representative of a predetermined position in its rotational direction. These reference marks are detected by first and second reference position sensors, thereby measuring the rotational periods of the photosensitive device and the intermediate transfer device so as to calculate a difference therebetween. A control section controls start timings of the formations of the toner images on the photosensitive device on the basis of the calculated period difference as time periods from the time that the first reference position sensor detects the reference mark of the photosensitive device.

Growing community of inventors

Fukuoka, Japan

Yuji Toyomura