Olympus Optical Company, Ltd.

Kazuhisa Yanagisawa

Eiichi Sato

Hitoshi Watanabe

Masaji Nishikawa

Tatsuo Nagasaki

Shinichi Imade

Akira Shimizu

Hiroyuki Yoshimori

Masayoshi Omura

Eishi Ikuta

A ferroelectric memory includes a ferroelectric thin film having first and second surfaces opposite to each other, a first electrode assembly having a plurality of stripe electrodes arranged in parallel on the first surface side of the ferroelectric thin film, a second electrode assembly having a plurality of stripe electrodes arranged in parallel on the second surface side of the ferroelectric thin film to intersect the stripe electrodes of said first electrode assembly, first and second common electrodes arranged separately from the end portions of the respective first and second electrode assemblies to extend in respective directions in which the stripe electrodes of the first and second electrode assemblies are arranged, and selecting sections for respectively connecting the first and second electrode assemblies to the first and second common electrodes and selectively activating at least one of the stripe electrodes of each of the first and second electrode assemblies.

Ferroelectric memory

In a process for forming electrophotographically a duplicated copy of a document by modulating a corona ion stream passing through fine apertures of a photosensitive screen in accordance with a primary electrostatic charge latent image formed on the photosensitive screen use is made of the photosensitive screen comprising an electrically conductive sheet-like member having a great number of fine apertures, a photoconductive member applied on at least one side of the conductive member and an electrically insulating member applied on the other side of the conductive member, the conductive member being completely surrounded by the photoconductive and insulating members. An improved process for forming the primary charge latent image on said screen includes a step for subjecting the photosensitive screen to an imagewise exposure corresponding to an image of the document simultaneously with electrostatically charging the screen; and a step for subjecting the photosensitive screen to a uniform exposure to form on the insulating layer of the screen the primary electrostatic charge latent image corresponding to an image of the document to be duplicated and having extremely high electrostatic contrast.

Electrophotographic process and photosensitive screen for use in such

An electrophotographic apparatus comprises a photosensitive screen drum of a radius r.sub.1 having a number of apertures formed therein and rotating through a printing or charging area having a width W at a constant peripheral velocity v.sub.1, a record medium such as a charge transferring drum of a radius r.sub.d (r.sub.2 = r.sub.1) arranged opposite to the screen drum with a distance d at the printing area and rotating through the printing area at a constant peripheral velocity v.sub.2, means for forming on the screen drum an electrostatic latent image of a document to be copied, and means for generating a corona ion stream passing in the printing area through the apertures of the screen drum, whereby the corona ion stream is modulated with an electric field formed in or near the apertures of the screen drum so as to form on the transferring drum a charge image corresponding to the latent image on the screen drum. The screen drum and transferring drum are rotated at a velocity ratio k = v.sub.2 /v.sub.1 which satisfies the following equation. ##EQU1## When the record medium is a copy paper, it is fed through the printing area along an arcuate passage having the radius r.sub.2 at the constant peripheral velocity v.sub.2.

Electrophotographic apparatus

Growing community of inventors

Mitaka, Japan

Kazuhisa Yanagisawa