Charge carrier medium and reproduction of electrostatic latent i

Details Charge carrier medium and reproduction of electrostatic latent i Charge carrier medium and reproduction of electrostatic latent i

1993-03-08

1996-03-05

Wong, Peter S.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347155, G01D 1506

Patent

active

054971799

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a charge carrier medium, and concerns reproducing or reconstructing an electrostatic latent image recorded on the charge carrier medium as well.


BACKGROUND ART

We have already filed Japanese Patent Application No. 63-121592 directed to an invention concerned with a process for recording an image on a charge carrier medium in the form of an electrostatic latent image and reconstructing it, wherein a photosensitive member including on a support an electrically conductive layer and a photoconductive layer is located in proximity and opposition to a charge carrier medium including on a support an electrically conductive layer and an insulating layer. The photosensitive member and charge carrier medium are exposed to light while voltage is applied between the electrically conductive layers thereof, thereby inducing discharge between said photosensitive member and said charge carrier medium. This process makes it possible to obtain analog electrostatic records of high resolution and enables the electrostatic latent image on the charge carrier medium to be kept semipermanently.
The charge carrier medium has the advantages of being able to provide very high resolution recording and keeping image information semipermanently. When it comes into contact with water, etc., however, its apparent potential is so attenuated that it cannot be detected. In addition, the charge carrier medium is still less than perfect in view of security, although providing some difficulty to a third person trying to reconstruct the image information recorded on it.
An object of the present invention is to provide a solution to the problems mentioned above. The charge carrier medium according to the present invention is immersed in water, etc., to deposit thereon charges that are opposite in polarity to those of an electrostatic latent image formed thereon, wherein it remains possible to resurrect the electrostatic latent image which itself cannot be detected in the form of potential. Alternatively, the charge carrier medium is immersed in water, etc., after an electrostatic latent image has been formed thereon, to deposit thereon charges that are opposite in polarity to those of the electrostatic latent image, thus making any external access to the electrostatic latent image impossible. Thus, the present invention enables high-resolution image information to be stored over an extended period of time, makes it possible to resurrect the potential attenuated by contact with water, etc., and protects the image information against third party access so as to improve its security. The present invention provides an electrostatic latent image-reproduction process as well.


DISCLOSURE OF THE INVENTION

More specifically, the present invention provides a charge carrier medium wherein an electrically conductive layer is provided with an insulating layer on which an electrostatic latent image is recorded or wherein a charge carrier medium with an insulating layer having an electrostatic latent image recorded thereon is provided thereon with an insulating coating layer, characterized in that the insulating layer or insulating coating layer is deposited thereon with charges opposite in polarity to those of the electrostatic latent image so as to attenuate the surface potential thereof, and that film is brought in close contact with, and then peeled apart from the surface of the insulating layer or insulating coating layer, onto which charges of the opposite polarity are deposited, so as to remove the charges of the opposite polarity, thereby reconstructing the electrostatic latent image.
The electrostatic latent image recorded on the insulating layer disappears due to charge migration, although it may be externally detected or read in the form of surface potential. Surface potential attenuation also takes place by the deposition of charges of the opposite polarity, because the electric field is so confined that the surface potential cannot be detected.
In one of the former possible mechan

REFERENCES:
patent: 4087170 (1978-05-01), Sawaoka et al.
patent: 4331753 (1982-05-01), Mikelsons et al.
patent: 5019835 (1991-05-01), Arahara et al.
patent: 5049935 (1991-09-01), Saito et al.
patent: 5126769 (1992-06-01), Lewicki et al.

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