Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-12-18
2000-08-22
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347140, 347141, 347212, 399336, 399342, B41J 2435, B41J 239
Patent
active
061080225
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a laser printing method and apparatus for producing documents bearing printed graphic matter and textual matter, generally including identifying photographs, comprising documents bound in booklet form, particularly passports and the like, and other identification documents, such as identity cards, passes and the like, and to the documents obtained by said method.
BACKGROUND OF THE INVENTION
In this application, the terms "substrate" or "printing substrate", without further specification, include any substrate on which printing is effected, regardless of its form and composition, be it e.g. uncoated or coated paper, plastic or any other sheet material, or a page of a booklet or other bound object intended to carry printing on pages or other parts thereof. The terms "picture" or "image" or "subject matter", as used herein, synonimously indicate any kind of printable or printed subject matter, and therefore comprise, among other things, pictures representing persons or objects, portraits, photographs, letters, words, signs, signatures, data, and any figures or images or graphic symbols that may be carried by a substrate of any kind. In many cases to which this invention is applied, the picture comprises a portrait of the owner of a document and words, numbers and the like, that contain information relevant to the identity of said owner and to the character, validity period, and other features of the document itself.
Graphic matter printed on passports, identifying cards and like documents, generally includes identifying photographs, particularly color photographs, accompanied by identifying data. For this purpose, the laser printing process and laser printing machines are widely used.
Basically, the laser printing process comprises, as a first step, defining the subject matter to be printed in the form of an array of signals that can be used to control the printing machine. A common way of doing this consists in capturing the subject matter to be printed and registering the results of the capturing in a processor's memory, in the form of an array of digital signals. Said signals control the emission of laser rays from a laser source. The laser beams impinge on a cylinder in a pattern controlled by the said signals and electrostatically charge the surface of said metal cylinder at selectively predetermined spots. The selectively electrostatically charged cylinder passes in the vicinity of a reservoir of coloring matter in powder form. The coloring matter particles are attracted to the aforesaid selectively charged spots of said cylinder and form thereon the desired pattern. A print substrate is then passed into contact with the metal cylinder and the pattern formed by the color particles is deposited thereon. This operation is repeated for each color if a multicolor print is desired, usually four times to provide the basic colors magenta, cyan and yellow plus black (black will hereinafter be considered to be a color), to produce a complete color image. At this stage a colored image has been formed on the print substrate. In order to stabilize the image, the print substrate is passed between heated rollers, which fix or set the print so that it is permanent and stable.
This process is quite effective for a number of applications, but it encounters difficulties, hitherto unsolved, when it is necessary to print on a substrate that is not in the form of a free sheet, but is in bound e.g. in the form of a booklet or a pouch, typically a passport or similar bound document. It would be highly desirable to print on a passport or like document, after it has already been bound in booklet form, the passport holder's photograph, signature, and/or other printed information. However, this is not possible with conventional color laser printing techniques. Other difficulties would arise, should the print substrate have a surface which is not absorbent with respect to the colors: the coloring matter is then partly if not totally transferred from the print substrate to the he
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Hassan Jacob
Landman Avi
Rozen Eli
Le N.
Pham Hai C.
Supercom Ltd.
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