Dainippon Screen Seizo Kabushiki-kaisha

Dainippon Screen Manufacturing Co., Ltd.

Seiji Okazaki

Hitomi Atoji

Masuo Kunisawa

Riyo Shimooka

Yuji Mizuno

Takeshi Yoshimoto

Yoshihiro Taniguchi

Tsutomu Harada

Shinji Itoh

Hideki Hiraoka

The invention provides a device for efficiently mounting an original onto an image reading drum in an image scanning system. The mounting device includes a lower holder section and an upper holder section, each made of a flexible but hard plastic sheet. The original is held in between the lower holder section and the upper holder section and is attached onto the image reading drum, which has a predetermined thickness greater than a distance causing Newton's rings. Accordingly, image signals obtained by scanning the original effectively represent an original image without Newton's rings.

Device for mounting an original onto an image reading drum

A method for setting up density values of highlight and shadow points of original pictures to a picture reproducing machine such as a color scanner and a color facsimile, wherein one of the original pictures now being scanned is discriminated to output a discrimination signal, and wherein the highlight and the shadow point density values or values corresponding to a density range of the one original picture are read out of a memory in which the highlight and the shadow point density values or the values corresponding to the density ranges of the original pictures are stored, by addressing the memory by means of the discrimination signal, and then are set up to the picture reproducing machine.

Method for setting up highlight and shadow point density values of

An aperture plate for use in the exposure head of a picture scanning reproducer which constructs an image by exposure of a film attached to a rotating drum in scanning mode, the aperture of which plate has a shape incorporating parallel lines and end portions consisting of twin lines opening up away from a cusp, which in some embodiments may be exponential curves, whereby overlap effects in the constructed image are substantially eliminated.

Aperture plate for an exposure head for use in a picture scanning

A picture scanner using a light beam which has first passed through a mask plate to scan a picture fixed to a revolving cylinder is provided with a system for adjusting the transverse position of the light source, consisting of a mirror which can be pivoted into the path of the light beam, a screen on which an image of the light source and an image of the mask plate can be simultaneously projected, and means for focusing both these images into the same plane.

Picture scanner with a scanning light position detector

Growing community of inventors

Kyoto, Japan

Seiji Okazaki