Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1995-03-27
1997-10-21
Vu, Kim
Facsimile and static presentation processing
Facsimile
Picture signal generator
358494, 358496, 358497, H04J 104
Patent
active
056802285
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a copying device with a scanner camera for scanning originals, which can be illuminated for the copying process, with an optical system for optical projection of the original and with a photoelectric line sensor at the output of which the electric signals of the individual scanning points are available.
From EP-A-124098, a copying device is known with which, by means of a scanner camera with photo-electric line sensor, an illuminated original to be copied is to be scanned. The original lies with the side to be scanned facing upwards and the scanner camera is arranged at a certain distance above this original. The scanner camera has an optical system, which is adjustable for focusing, for optical projection of the original into a predetermined image plane of the camera. In this image plane the projected image is scanned line by line by means of the photo-electric line sensor.
This known scanner camera has a number of additional features, such as e.g. a device for focusing the image of the illuminated original in the image plane of the camera. This arrangement comprises an optically imageable pattern structure with an associated source of illumination, by means of which this pattern structure is to be so illuminated that an image of this master structure, the sharpness of which can be monitored, can be produced in the plane of the original by means of the optical system, through adjustment thereof. A keyboard with individual keys is provided, through the actuation of which individual working processes of the camera can be activated.
The output signal of the line sensor of the camera is fed to an associated computer, in which signal processing of the sensor signals is carried out in accordance with the software provided. With the known scanner camera a CCD line sensor is provided and the output signals of the line sensor are converted in the computer into a computer language provided and processed. From the computer, signals of the scanning process which are prepared in ASCII-format are output, which are suitable for telefax-like transmission to a remote receiving location. However, the ASCII-signal can also be fed to any printer, from which print-outs of the copying process can then be obtained.
In general, computers are so common nowadays that usually a computer need not be additionally obtained for the copying device of the above-mentioned publication: resort can be made one already present for other purposes. Although present-day computers work relatively fast, the copying speed achievable by means of such a known system is satisfactory only to a certain extent.
It is the object of the present invention to provide measures by means of which a copying process can be performed with a scanner camera, which copies from above, at a higher working speed and, moreover, the technical outlay can be reduced, both for black-and-white copies (without half-tones) as well as for copies in which, in the copy, the darkness of the printed signs or characters corresponds to the intermediate value levels of the output signal of the line sensor.
This object is achieved with a copying device having the features of claim 1 for black-and-white copying and those of claim 2 for copies with grey tones. It is of particular advantage to provide also a mechanical implementation of the drive of the line sensor.
In the prior patent application DE-P-41 13 594.6, of Apr. 25, 1991, purpose and exemplary embodiments of a scanner camera are described in detail. With the known copying devices, which are mainly intended for copying individual sheets, copies can be made from books and the like only very inconveniently and at a slow speed. For this problem the copying device which is known from the above-mentioned EP-A-124098 offers some help, in that a book, the individual pages of which are to be copied, is laid on a table and the copying is carried out with a scanner camera which is positioned above the table. The book remains lying on the table, and only the individual pages are turned. With such a working p
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patent: 3830975 (1974-08-01), Putter
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patent: 4150873 (1979-04-01), Dali
patent: 4272187 (1981-06-01), Birdsall et al.
patent: 4435723 (1984-03-01), Seimiya et al.
Harris Tia M.
Vu Kim
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