Fuji Photo Film Company, Limited

Yoshio Kudo

Masakazu Iwasa

Hisashi Kato

Takashi Shoji

Hiroshi Horikawa

Daigo Ezuka

An optical memory disk has a recording layer which is disposed on one surface of a plain circular support base and has a plurality of radially spaced data tracks for storing data items therein, the data tracks being grouped into a number of data track groups. Each of the tracks is divided into a plurality of angularly consecutive sectors bearing a plurality of angularly equally spaced sector marks, respectively, the sector marks on the tracks of each of the data track groups being located in angularly different positions, respectively. There are also disclosed a method of and a system for rapidly and reliably accessing a desired target track among the data tracks on the optical memory disk.

Optical memory disk and track access therefor

In an electrostatic apparatus using a toner layer carried by a developing roller for developing a latent image, a doctor blade applied with a voltage of the same polarity as that of the toner is used for partly scraping the toner layer. The toner scraped off is sucked by a suction means. An additional doctor blade is preferably used together with the main doctor blade to make rough and fine control of the thickness of the toner layer.

Method of developing electrostatic latent image

In an electrostatic apparatus including a developing roller for applying a toner to an electrostatic latent image carrying drum, a squeeze roller is provided in the vicinity of the developing roller. The squeeze roller is applied with a voltage to attract a part of the toner layer on the developing roller and reduce the thickness of the toner layer.

Apparatus for developing electrostatic latent image

In an electrostatic image recording apparatus employing a series of recording styluses for forming a latent image on an electrostatic image recording drum, an over-discharge is conducted either by applying a very high voltage to the recording styluses or by first subjecting the drum to a pre-charge in one polarity and then forming the latent image on the drum by an over-discharge in the opposite polarity. Pre-charging of the drum enhances the effect of the subsequent discharging and permits over-discharge to be conducted with a lower voltage applied to the recording styluses than would otherwise be possible.

Electrostatic image recording method and apparatus therefor

In an electrostatic print marking apparatus for printing markings on steel plates wherein an intermediate image carrying medium is used for transferring a toner image from an electrostatic image recording drum to a steel plate, a toner image transferred from the drum to the intermediate image carrying medium is re-charged before it is transferred from the image carrying medium to the steel plate.

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Tokyo, Japan

Yoshio Kudo