EP0167143A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of driving optical switch element

Assignee: Hitachi Ltd

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Filing: 1985-07-02

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Granted: —

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Expires: 2005-07-02

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Abstract

Abstract In a driving method of an optical switch element for controlling a quantity of transmission light between opposed electrodes by interposing a transparent, high dielectric material (4) between the opposed electrodes (6a, 6b) and applying a positive or negative voltage between the opposed electrodes, (by changing over a switch 13 from a terminal a to terminal b or terminal c) the improvement wherein a period in which the opposed electrodes are substantially short-circuited is disposed in order to make it possible to either reduce or eliminate stored charge. This method can be applied in a printer using the optical switch element.

Inventors

👤 Takao Umeda
👤 Kazuya Ohishi
👤 Tatsuo Igawa
👤 Yasuro Hori

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-08 03:53

CPC Classifications

G; G02; G02F; G02F1/00; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1242; G06K15/1252; G02F1/01; G02F1/0121; G02F1/13; G02F1/133; G02F1/13306; Y; Y10; Y10S; Y10S359/00; Y10S359/90

Claims Analysis

Total Claims: 6

Claim 1

Independent Claim 62 words

Method of driving an optical switch element (14) by interposing a transparent, high dielectric material (4) between opposed electrodes (6a, 6b) and applying a positive or negative voltage between said opposed electrodes so as to control the quantity of transmission light between said opposed electrodes, the improvement wherein a period in which said opposed electrodes (6a, 6b) are substantially short-circuited is disposed.

Claim 2

Dependent Claim 28 words

Method of driving an optical switch element as defined in claim 1 wherein short-circuit of said opposed electrodes (6a, 6b) is effected by connecting electrically said opposed electrodes.

Claim 3

Dependent Claim 137 words

Printer for printing a desired print pattern on paper, including at least: a light source (8); an optical switch element (14) for controlling selectively the quantity of transmission light between opposed electrodes (6a, 6b) with respect to incident light from said light source, by interposing a transparent, high dielectric material (4) between said opposed electrodes and applying a positive or negative voltage between said opposed electrodes; and a photosensitive drum (16) to which the transmission light of said optical switch element (14) is radiated; the improvement wherein a period in which said opposed electrodes (6a, 6b) are substantially short-circuited is disposed in the driving period of said optical switch element corresponding at least one of the non-print regions at the leading (17a) and trailing end (17b) portions of said paper among the non-print regions of said paper.

Claim 4

Dependent Claim 23 words

The printer as defined in claim 3 wherein short-circuit of said opposed electrodes (6a, 6b) is effected by connectin electrically said opposed electrodes.

Claim 5

Dependent Claim 62 words

The printer as defined in claim 3 wherein the driving period of said optical switch element (14) corresponding to said non-print regions include mixedly a first period in which said opposed electrodes are substantially short-circui and a second period in which a positive or negative voltage is applied between said opposed electrodes so as to substant. ially cut off said transmission light.

Claim 6

Dependent Claim 17 words

The printer as defined in claim 5 wherein said first period is longer than said second period.

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