Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-07-27
1988-09-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
365112, H01J 4014
Patent
active
047711833
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a photo-electric imaging device and in particular it relates to a device which produces a high resolution readable image with a practical working resolution of 1,000,000 bits per square millimeter or optically 1000 lines per millimeter, the device being optically electronically addressable.
It is known in the art to provide an image by means of electrostatic development of discrete areas containing a charge and to grade the charges on each discrete area to produce an image.
As an example of the state of the art reference may be had to be U.S. Pat. No. 3,611,419, of John Blumenthal; granted 5th Oct., 1971 in which an electrographic imaging system is described in which an array of small electrodes are arranged in rows over a conductive plate, and a dielectric member is moved between the small electrodes and the conductive plate while a patterned electric field is generated to dynamically produce a latent electrostatic image on the dielectric member which can then be rendered visible by applying a toner of a selected polarity in a known manner.
In a further example as described in U.S. Pat. No. 3,774,168 of Tuh-Kai Koo et al a beam accessed semiconductor memory device has a series of integrated circuit wafers arranged in blocks on a substrate which are not interconnected but control is from means on the other side of the substrate, the memory device being actuated by an energy beam scanned across the blocks.
In U.S. Pat. No. 3,329,962 of R. A. Cola granted 4th July, 1967 a solid state electron transducer is described in which orthogonally arranged strips, which are separated from each other by an insulator, are disposed over an insulating-dielectric substrate in row and column format and energised to give beams of electrons or ions which produce a latent electrostatic image on a recording material. The latent electrostatic image is developed to render it visible.
In modified form Cola also describes an embodiment in which the orthogonal superimposed strips are replaced by orthogonal rows of conductors arranged in the same plane. The Patent refers to the electric field being produced in an insulating layer disposed between selected electrodes to cause electron emission into an air gap as a result of quantum mechanic tunnelling.
As a further example of prior art reference may be had to two U.S. Pat. Nos. 3,979,757 and 3,979,758, in the name of Jack S. Kilby et al, in which according to one form a large number of electrodes are presented at the surface of a module and are energisable individually by using shift registers which control the charge on the individual electrodes.
The electrodes are energised by separate bistable circuit means and the Patent has reference to which is generally now referred to as "half tone" effects, that is a grading of the deposit to produce different shades of colour.
The object Of the present invention is to provide certain improvements in this general art and particularly in the method of construction and use of a module of this type, it being a further object to provide a module which can produce an image which may be developed and visually displayed or in which an image can be projected onto the module to store the image on a computer, a further object being to provide an image on the module having high resolution and to provide a module which can readily be constructed by present day known integrated circuit techniques. Other objects will be apparent from the description of the invention.
The invention comprises a module having a substrate and on the substrate rows and columns of electrodes at least partly electrically isolated from the substrate with the electrodes of the rows and the electrodes of the columns disposed one over the other but isolated one from the other by a semiconductor interface, and disposed over each pair of electrodes an imaging plate at least partly electrically isolated from the electrodes but connected to the electrodes through a control transistor whereby the imaging plate forms one member of a capacitor in association with i
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Jabali Pty. Ltd.
Nelms David C.
Oen William L.
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