Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1990-03-20
1991-04-02
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 77, 354131, G03B 2774, G03B 2780
Patent
active
050050451
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a reprographic camera system comprising a reprographic camera with a vertical optical axis and a mainly horizontal, original table positioned under the objective lens of the camera. It also relates to an arrangement separate from the camera intended to transfer signals of density and/or picture data to an exposure control means in the camera.
Reprographic camera systems of this type are used for the reproduction of pictures and/or text in black and white or colors. The basis of controlling the exposure of the camera includes a main exposure and a so-called bump exposure and possibly a pre-illumination, In that respect, either a direct measurement of the density values of the original must be effected and conversion of the measured values to signals used for adjusting the camera control by a densitometer, that is an instrument manually movable across the original placed on the original table, or a transfer of density and picture data to the camera from a calculator unit provided with a keyboard and which may either be an integrated part of the camera or a unit separate from the camera.
In known reprographic camera systems the transfer of signals to the camera from the densitometer or a possible separate keyboard calculator unit is effected via usual wire or cable connections, thereby limiting the physical movement possibilities of the densitometer and the possible placements of the calculator unit in relation to the camera.
SUMMARY OF INVENTION
To remedy said drawback the reprographic camera system according to the invention is characterized in that the reprographic camera and said arrangement include transducer means for wireless transfer of signals from said arrangement to the exposure control means.
The wireless transfer of signals preferably performed by using ultrasound or infrared radiation increases considerably the movability of the densitometer, thereby enabling it to move freely across the original table or even to measure density values of originals placed outside the original table. It also allows free placement of keyboard calculator unit which may be a hand-held computer or a desk-top computer.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be explained in the following with reference to the accompanying drawings, in which
FIG. 1 illustrates an embodiment of a reprographic camera according to the invention,
FIG. 2 shows a simplified block diagram of the transfer of signals from a densitometer to a camera, and
FIG. 3 is a similar block diagram of a keyboard calculator unit for a camera.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 the reprographic camera system includes a camera 1 with a vertical optical axis and an objective lens 2 beneath which an original table 3 is arranged upon which the originals to be reproduced are placed.
For measuring the density values of the original generally displayed on a scale from 0.00 to 4.00 a densitometer in the form of a movable hand-held instrument 4 may be moved in the original plane and placed anywhere on the original, or in respect of pre-recording density data the densitometer may be moved across an original not yet placed on the original table.
In the illustrated embodiment a keyboard calculator unit 5 for pre-setting picture and exposure values is formed as a separate unit separate from the camera. Such a calculator unit may comprise a memory, not shown, for storing density and picture data corresponding to a number of different originals.
To accomplish wireless transferring signals between the camera 1 and the densitometer 4 and/or the calculator unit 5, each one of said devices comprises, as shown in FIGS. 2 and 3, transducers means 6, 7 and 8, respectively, said transducer means being preferably ultrasonic transducers or infrared transducers converting the density values and/or the signals of density values of electrical signals and/or the picture or exposure data pre-programmed in the calculator unit 5 via the keyboard 15 or pre-recorded via the densitometer, in
REFERENCES:
patent: 3185056 (1965-05-01), Gold et al.
patent: 4443090 (1984-04-01), Miyakawa et al.
Helioprint Als
Hix L. T,.
Rutledge D.
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