Canon Kabushiki Kaisha

Mitsuhiro Tokuhara

Yu Yamada

Tetsuo Sueda

Yukio Takemura

Haruhisa Honda

Takeshi Kuwayama

Susumu Seto

Hiroaki Tsuchiya

Michitaka Setani

Akiyoshi Torigai

Teruo Morikawa

Takashi Saito

Kazuo Tanaka

Yoshinori Ikeda

Hiroshi Ogawa

Tsutomu Toyono

Tsuneki Inuzuka

Akihiro Usami

Setsuo Minami

Takeshi Baba

Masamichi Tateoka

Mitsuharu Sawamura

Takao Aoki

Ryusho Hirose

Hiroshi Nitanda

Masatoshi Okutomi

An image-forming apparatus capable of changing the size of the image formed on an electronic photosensitive medium is disclosed. The image-forming apparatus is provided with an auxiliary projection optical system in addition to a main projection optical system which is able to project an image on the photosensitive medium with variable magnification. The auxiliary projection optical system is provided to illuminate exclusively the non-image forming area of the photosensitive medium. The size of the image of the light source of the auxiliary projection optical system formed on the photosensitive medium is controllable as desired.

Variable magnification image forming apparatus

An image processing apparatus comprises a detector which includes an image reading section of a digital copier and which chases outline information of an image pattern in a predetermined direction and thereby extracts outline points; an arithmetic operating circuit to respectively obtain outline tangential directions on the basis of the outline points; an extracting circuit to select a predetermined number of extraction points from the outline points; a coding circuit to sequentially obtain direction differences in the outline tangential directions on the basis of the extraction points and to code the direction differences; and a recognizing circuit to perform a non-linear matching between a code sequence coded by the coding circuit and a reference code sequence, thereby recognizing the image pattern. The coding circuit calculates the outline tangential directions using predetermined direction codes. With this apparatus, an image pattern can be stably and accurately recognized at high speed without being influenced by positional deviation, rotation, change in size, or the like of the image pattern.

Image processing apparatus

A projection apparatus comprises a light source, a light scanning optical system including an electro-mechanical transducer element having at least one mirror row comprising a plurality of movable mirrors capable of deflecting the light beam from the light source in at least two directions and arranged in a direction corresponding to the main scan direction, a driving device for putting out a signal for driving the movable mirrors, the movable mirrors deflecting the light beam in response to the signal, and a light-receiving member by which the light applied from the light scanning optical system is subsidiary-scanned, at least one of the shape and arrangement of the mirrors and the subsidiary scan pitch being set so that light dots adjacent to each other in at least one of the main scan direction and the subsidiary scan direction in the pattern of light dots formed on the light-receiving member by the deflected light from the movable mirrors of the mirror row overlap each other to a sufficient degree to obtain a sufficiently good quality of image.

Projection apparatus provided with an electro-mechanical transducer

A color image reading apparatus with a plurality of line sensors and an associated plurality of rotary color filter disks produces a plurality of sequential color component signals from each line sensor. An amplifier with an adjustable gain is provided for each of the line sensors. A white balance operation is performed prior to reading a color document by determining gains for each of the amplifiers to use in amplifying corresponding ones of the sequential color component signals on the basis of a plurality of reference color component signals generated by reading a white reference plate with the line sensors. The determined gains are stored in a memory as digital data. The data is read out and used to control the gains of the amplifiers while a color document is being read. Color balance correction switch units enable an operator to selectively modify the determined gains in order to adjust the color balance of the color component signals.

Color image reading apparatus with a plurality of line sensors in which

In an imaging optical system, the angular aperture of distributed index optical elements which are optical elements forming the imaging optical system is 9.degree. or greater and the degree of superposition M of images on a light-receiving surface is M=2.75+0.5x. The degree of superposition M of images is represented by M=X.sub.0 /D, where D is the effective diameter of the optical elements and X.sub.0 is the field radius thereof. Also, x is 0 or a greater integer.

Imaging optical system using distributed index optical elements

A copy board apparatus for copying information on a web-like writing board supported by rollers with an electrophotographic copier disposed adjacent one longitudinal end of the writing board. The apparatus has a first optical system for optically connecting the writing board and a photosensitive member of the copier, a second optical system for optically connecting an original on the copier and the photosensitive member, and change-over circuitry which permits switching between the two optical systems.

Copy board apparatus

An electrophotographic apparatus has illuminating means for illuminating an original, scanning means for scanning the original, imaging means for imaging the reflected light or the transmitted light from the original on a light-receiving member, the imaging means having at least one variable refractive power element, control means for varying the refractive power of the variable refractive power element, and driving means for moving the light-receiving member in synchronism with the scanning of the original.

Electrophotographic apparatus

An image exposing apparatus comprises a focusing optical system for focusing an image onto a photosensitive member and having a one-line array of a plurality of focusing light transmission media, and light intensity distribution correction means arranged in a light path for forming the image for eliminating an ununiformity of light intensity on the photosensitive member due to the focusing optical system.

Image exposing apparatus

In collimating the light beam from a light source by the use of a refractive index distribution type lens the refractive index of which on the optic axis is n.sub.0 and the refractive index n(r) of which at a position spaced by r from the optic axis is represented by

Method of forming a light source by the use of a refractive index

A slit exposure projection device having a projection optical system and/or an aperture stop designed such that the pupil of the projection optical system in the longitudinal direction of the slit is large relative to the pupil in the lateral direction of the slit.

Slit exposure projection device

An electrophotographic copying apparatus includes a light receiving element disposed to receive beams of light from the central and lateral end portions of an original to be copied through a lens, the output signal of the light receiving element being used to control a copy image with respect to its darkness.

Electrophotographic copying apparatus with original light detector

A projecting device for projecting an image of the surface of a body on a light receiving surface, in which optical element blocks are provided symmetrically with respect to a stop, of which the diameter of aperture is always constant in varying the magnification. The device includes a projecting optical system to change the focal length by symmetrically moving with respect to the stop at least a part or the whole of the optical element blocks, and means for restricting the field of the surface of a body, disposed between said projecting optical system and the surface of the body. The exposure amount on the light receiving surface is maintained substantially constant in varying the magnification by making the change of the focussing magnification of the projecting optical system to mainly correspond with the change of refractive power of the optical element blocks which are disposed on both sides of said stop.

Variable power projecting device

A printer head comprising a light source device, and an optical modulator element for switching the light projected from the light source device, a device for splitting the light projected from the light source device into two polarized light components to form respectively a first light path and a second light path, a device for converting the polarized light of the second light path into light having the same polarization as the light component of the first light path, and a device for directing light of the first light path and/or the second light path to the optical modulator element.

Printer head and electrophotographic printer utilizing the same

A variable magnification optical system includes two movable groups of the so-called symmetric orthometer type each of which includes a positive power lens, a negative power lens and a meniscus positive lens that are in sequence disposed symmetrically with respect to a diaphragm, said optical system further including negative lenses mounted outside said movable groups symmetrically with respect to said diaphragm to form a fixed group, said movable groups being moved along the optical axis relative to said fixed group in symmetrical fashion with respect to said diaphragm to vary the focal length of said optical system, the entire optical system being moved as one body to bring the object and image planes into a position that they are optically conjugate with each other.

Variable magnification optical system

A device for slit-scanning the surface of an original and projecting the image of the surface of the original onto a light-receiving medium comprises an imaging optical system for forming the image of the surface of the original on the light-receiving medium. The imaging optical system has means which, in a first condition, has equal imaging magnifications in orthogonal directions, i.e., the widthwise direction of the slit and the lengthwise direction of the slit and is for keeping the surface of the original and the light-receiving medium in an optically conjugate relation and which, in a second condition, has different imaging magnifications in orthogonal directions, i.e., the widthwise direction of the slit and the lengthwise direction of the slit and is for keeping the surface of the original and the light-receiving medium in an optically conjugate relation in both of the directions.

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Chigasaki, Japan

Mitsuhiro Tokuhara