Back to results
US 4,912,507 AGranted
Electrophotographic copying apparatus for forming an image without any unnecessary shadow region
AssigneeMinolta Camera Kabushiki Kaisha
InventorNaoyoshi Kinoshita
Life of this patent
Estimating the term…
Abstract
An electrophotographic copying apparatus comprises an image forming unit for forming an image of an original to be copied, and a developing device for transferring the image onto copy paper, the image forming unit including a scorotron charger for representing only outlines of the original image. When the original is copied with a cover being not placed thereon, a shadow would be usually formed in an area corresponding to the portion not covered; however, the scorotron charger forms an outline image of this shadow and accordingly no shadow is formed in the area corresponding to the portion not covered.
Claims21
An electrophotographic copying apparatus comprising:
- a photoreceptor drum on which an electrostatic latent image is to be formed,
- a document placing table on which an original is to be placed, said original including an original image to be copied,
- a document cover to be opened and closed on said document placing table,
- cover detection means for detecting an opened or closed state of said document cover,
- electrostatic latent image forming means for forming, on said photoreceptor drum, an electrostatic latent image corresponding to the original image on said document placing table,
- outline forming means provided in a position opposed to said photoreceptor drum, for forming only outlines of said original image, and
- control means for enabling said outline forming means to execute outline copy of said original image when said cover detection means detects the opened state of said cover,
- whereby an outline image is formed with the outlines of said original image being intensified.
5 more elements
An electrophotographic copying apparatus capable of forming an outline image with outline portions intensified by applying a desired charge by a scorotron charger to an electrostatic latent image formed on a photoreceptor drum comprising:
- a document placing table on which an original is to be placed, said original including a book having a binding margin
- book signal generating means for generating a book signal when said original is a book, said book including an original image,
- electrostatic latent image forming means for forming, on said photoreceptor drum, an electrostatic latent image corresponding to said original image on said document placing table,
- outline forming means provided in a position opposed to said photoreceptor drum, for forming only outlines of said original image, and
- control means for activating said outline forming means with respect to a binding margin area of said book to execute outline copy of said original image when said book signal generating means generates the book signal.
2 more elements
An electrophotographic copying apparatus capable of forming an outline image with outline portions being intensified by applying a desired charge by a scorotron charger to an electrostatic latent image formed on a photoreceptor drum, comprising:
- a document placing table on which an original is to be placed, said original including a book having a binding margin, said book including an original image, and including a first page and a second page facing each other,
- book division copy mode designation input means for designating a book division copy mode for copying said first and second pages on different copy areas,
- electrostatic latent image forming means for forming, on said photoreceptor drum, an electrostatic latent image corresponding to said original image on said document placing table,
- outline forming means provided in a position opposed to said photoreceptor drum, for forming only outlines of said original image, and
- control means for activating said outline forming means to execute outline copy of said original image when the book division copy mode is designated by said book division copy mode designation input means.
2 more elements
An electrophotographic copying apparatus comprising:
- a document placing table on which an original having an original image is to be placed,
- a photoreceptor drum to be rotated,
- charging means for charging said photoreceptor drum with a predetermined potential,
- exposure means for scanning said original image, exposing said photoreceptor drum charged by said charging means and forming an electrostatic latent image on said photoreceptor drum,
- a scorotron charger for applying, to said electrostatic latent image, a charge of a polarity opposite to that of said charging means, said scorotron charger including grid electrode, to which a voltage lower than a potential of the electrostatic latent image is applied,
- developing means for developing said electrostatic latent image,
- a document cover provided to be opened and closed on said document placing table,
- detection means for detecting an opened and closed state of said document cover, and
- control means for operating said charging means, said exposure means, said scorotron charger and said developing means according to a predetermined sequence and selecting an outline copy mode for copying said original image when said detection means detects the opened state of said document cover, and operating said charging means, said exposure means and said developing means according to a predetermined sequence and selecting a normal copy mode for copying said original image when said detection means detects the closed state of said document cover.
6 more elements
An electrophotographic copying apparatus comprising:
- a document placing table on which an original having an original image is to be placed, said original including a book,
- a photoreceptor drum to be rotated,
- charging means for charging said photoreceptor drum with a predetermined potential,
- exposure means for scanning said original image, exposing said photoreceptor drum charged by said charging means and forming an electrostatic latent image on said photoreceptor drum,
- a scorotron charger for applying, to said electrostatic latent image, a charge of a polarity opposite to that of said charging means, said scorotron charger including a grid electrode, to which a voltage lower than a potential of said electrostatic latent image is applied,
- developing means for developing said electrostatic latent image,
- book signal generating means for generating a book signal indicating a book when said original is the book,
- control means for operating said charging means, said exposure means, said scorotron charger and said developing means according to a predetermined sequence and selecting an outline copy mode for copying said original image when said book signal is generated, and operating said charging means, said exposure means and said developing means according to a predetermined sequence and selecting a normal copy mode for copying said original image when said book signal is not generated.
5 more elements
Dependencies are inferred from the claim text.