Hitachi Koki Co., Ltd.

Hitachi, Ltd.

Tsukasa Ogawa

Minoru Ohshima

Masami Ishikawa

Susumu Saito

Keiji Kataoka

Takao Umeda

Kenji Okada

Yasuyuki Tsuji

Hiroshi Ueno

Kunitomo Takahashi

Youji Hirose

Shuuho Yokokawa

Kazutoshi Obara

Takashi Nakazawa

Susumu Saitoh

Tohru Miyasaka

A method of optically recording original information supplied from information generating device on an optical recording material in an optical recording apparatus, comprising the steps of: generating, from the original information, interpolating information which is to be interpolated in a sub-scanning direction of the optical recording material; and optically recording the interpolating information in the sub-scanning direction by a plurality of laser beams.

Optical recording apparatus and method for adding information in a

A device for measuring a surface potential at a photosensitive body including: a potential sensor for measuring surface potentials at a plurality of positions on the photosensitive body; a plurality of sample hold circuits; and an adder for adding each measured surface potential held in each sample hold circuit, or an adder which adds up each measured surface potential and average the sum. The addition or averaging of the measured values serves to eliminate eccentricity-induced errors and noise in the surface potential measurements, thereby allowing a correct surface potential to be obtained.

Device for measuring surface potentials at photosensitive body and

A print-termination detecting apparatus and method for a line printer with which it is possible to accurately predict the termination of printing so as to shorten the paper feeding cycle and to thereby make it possible to attain higher speed printing. Based on the fact that the termination of printing can be predictively detected X columns earlier by anticipatory comparison with respect to a character which will come X columns after a currently opposite character, a pre-scanning flag for storing the result of the anticipatory comparison is provided wherein, when all the columns of the pre-scanning flag indicate 'no print data', it is recognized that printing has been terminated, whereupon the paper feeding cycle is started. X is determined taking into consideration the dead time in the paper-feeding system including a paper-feeding motor, the time required for comparison/collation, and the flight time of the respective print hammer.

Method and apparatus for detecting print-termination in line printer

A double beam scan type optical apparatus for use in a laser printer or the like. Such apparatus comprises two light sources and a lens system which provide scanning means for scanning a surface with parallel output light beams of the two light sources and beam distance controlling means for controlling the distance between the light beams. The reliability of the invention is improved by monitoring the intensity of the beams. Beam intensity checking means provide signals to verify that the intensity of each beam is maintained equal thus assuring that no abnormal conditions exist with the light sources or the lens system of the apparatus.

Double beam scan type optical apparatus

Growing community of inventors

Ibaraki, Japan

Tsukasa Ogawa