Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Masakazu Mizusaki

Tetsuroh Nakamura

Ken-ichi Masumoto

Keisuke Fujimoto

Masaru Imai

Masaaki Nakano

Yuji Toyomura

Shoichi Kitagawa

Tadashi Shiraishi

Masaomi Inoue

Syuuiti Watanabe

Masanobu Narazaki

Shinsuke Sato

Fumio Fukushige

The object of the invention is to extend the life of the light source while uniformizing the illuminance intensity in the main scanning direction. The invention is based on a light source of image reading apparatus comprised of film layers laminated on a transparent substrate in the order of a transparent electrode, an area light emitter and a metal electrode, and emitting light by impressing a specific voltage on these two electrodes. And an area light emitter column configured by arranging area light emitters corresponding to each color of R (red), G (green) and B (blue) in the sub scanning direction, or a monochrome area light emitter is arranged repeatedly in the main scanning direction. Accordingly, even when somewhere in the light emitting element has a defect like the film thickness is thin, the current gathering at this point with the low resistance value becomes a very small volume. Therefore, it would not occur that the film burns out from here.

Driving device of light source

Light source of image reading apparatus and driving device of light source

A heating roller () includes a heat generating layer () that generates heat by electromagnetic induction, a heat insulating layer (), and a supporting layer (), which are provided inwardly in this order. The heat generating layer () is composed of at least two layers that are a first heat generating layer of a magnetic material and a second heat generating layer of a non-magnetic material. The first heat generating layer has a specific resistance higher than a specific resistance of the second heat generating layer and a thickness larger than a thickness of the second heat generating layer. This allows the second heat generating layer to function effectively as a heat generating part that generates heat by electromagnetic induction. Thus, compared with the case where the heat generating layer () is formed only of a single layer of a magnetic material, heat generation efficiency is increased, thereby allowing warm-up time to be reduced. Further, the heat generating layer () is heated intensively, so that heat generation of the supporting layer () is reduced, thereby allowing the prevention of breakage of, for example, bearings supporting the heating roller ().

Heating roller, heating belt, image heating device, and image forming device

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

In a graduation record control apparatus, as a power source, a voltage of a sawtooth waveform is generated and used, and a part of this sawtooth waveform voltage is used at different timings to apply different voltages to the electrodes. Thus, a satisfactory gradation recording is carried out by changing the dot sizes.

Gradation record control apparatus for ink jet printer

In a multicolor printing apparatus in which a laser beam is scanned by a rotary polygon mirror to form an electrostatic latent image on a photosensitive medium, multicolor printing is effected by forming images of individual plural colors. When plane mirrors of the rotary polygon mirror which are used for scanning to form the head lines of images of different colors differ from each other, the difference in plane inclination between plane mirrors causes color shift or misregistration and image deformation. In order to prevent this disadvantage, the same mirror plane of the rotary polygon mirror is managed to be used for scanning to form the head lines of images of different colors.

Multicolor printing apparatus

Growing community of inventors

Fukuoka-ken, Japan

Masakazu Mizusaki