A REPROGRAPHIC CAMERA SYSTEM

Abstract: A reprographic camera system comprising a reprographic camera (1) with a vertical optical axis and a mainly horizontal original table (3) positioned under the objective lens (2) of the camera and an arrangement separate from the camera for the transfer of signals of density and/or picture data to an exposure control means in the camera including transducer means for wireless transferring signals from said arrangement to the exposure control means (9). Said arrangement may include a freely movable densitometer (4) for measuring density values in the original and/or a calculator unit (5) provided with a keyboard for keying picture data.

Description: 1 A Reprographic Camera System. 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 and an arrangement separate from the camera and 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 and the basis of controlling the exposure of the camera includes a main exposure and a so-called bump exposure and possibly a pre-illumina- tion, and 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 ori¬ ginal placed on the original table, or a transfer of density and picture data to the camera from a calcul- ator 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 trans¬ fer 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. 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. 2 The wireless transfer of signals preferably per¬ formed by using ultrasound or infrared radiation increases considerably the movability of the densito¬ meter, thereby enabling it to move freely across the 5 original table or even to measure density values of originals placed outside the original table and allows likewise freely to place a separate keyboard calculator unit which may be a hand-held computer or a desk-top computer. 10 The invention will now be explained in the following with reference to the accompanying drawings, in which Fig 1 illustrates an embodiment of a repro¬ graphic camera according to the invention, 15 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. 20 In Fig. 1 the reprographic camera system inclu¬ des 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. 25 For measuring the density values of the original generally displayed on a scale from 0.00 to 4.00 a den¬ sitometer in the form of a movable hand-held instrument 4 may be moved in the original plane and placed any¬ where on the original, or in respect of pre-recording 30 density data the densitometer may be moved across an original not yet placed on the original table. In the illustrated embodiment a keyboard calcul¬ ator unit 5 for pre-setting picture and exposure values is formed as a separate unit separate from the 35 camera. Such a calculator unit may comprise a memory, not shown, for storing density and picture data corres¬ ponding to a number of different originals. 3 With a view to wireless transferring signals between the camera 1 and the densitometer 4 and/or the calculator unit 5, each one of said devices com¬ prises, as shown in Figs 2 and 3, transducer means 6, 5 7 and 8, respectively, said transducer means being preferably ultrasonic transducers or infrared trans¬ ducers converting the density values and/or the signals of density values of electrical signals and/or the pic¬ ture or exposure data pre-programmed in the calculator 10 unit 5 via the keyboard 15 or pre-recorded via the densitometer, into ultrasonic or infrared signals which are further converted in camera 1 to electrical signals capable of controlling the exposure control means 9 of the camera. 15 The densitometer 4 comprises an opto-electric measuring transducer 10 such as a photo-cell emitting electric signals to the control electronics 11 of the densitometer, said electronics emitting again signals to a receiver/transmitter unit 12 communicating with 20 the transducer means 7. Similarly, in connection with the transducer means 6 the reprographic camera comprises a receiver/ transmitter unit 13 emitting control signals to the exposure control unit 14 formed as a processor unit. 25 As mentioned above, the calculator unit 5 may include a memory for storing density and picture data for a large number of pictures and, accordingly, the signal transfer system is arranged so that said memory, with respect to transferring the density and picture 30 data corresponding to a determined one of a number of originals, may be addressed from the central processor unit of the camera via the transducer means 8 in com¬ munication with a receiver/transmitter unit 17 con¬ nected to the control electronics 16 of the calcul- 35 ator unit.

Claims: 4 P A T E N T C L A I M S 1. A reprographic camera system comprising a reprographic camera (1) with a vertical optical axis and a mainly horizontal, original table (3) positioned 5 under the objective lens (2) of the camera and an arrangement separate from the camera for the transfer of signals of density and/or picture data to an expo¬ sure control device in the camera, characterized in that the reprographic camera (1) and said device 10 include transducer means (6, 7, 8) for wireless trans¬ fer of signals from said arrangement to the exposure control means. 2. A reprographic camera system as claimed in claim 1, characterized in that said arrangement 15 includes a freely movable densitometer (4) for measuring density values in the original. 3. A reprographic camera system as claimed in claims 1 or 2, characterized in that said arrangement includes a calculator unit (5) provided with a key- 20 board for keying density and picture data and for transferring said data to the exposure control means (9). 4. A reprographic camera system as claimed in claims 1, 2 or 3, characterized in that the signal con- 25 nection between said arrangement and the camera is a two-way connection. 5. A reprographic camera system as claimed in claims 3 or 4, characterized in that said calculator unit (5) includes a memory device for storing density 30 and picture data corresponding to a number of pictures.

Inventors: STOEVRING KNUD STEEN, STOEVRING, KNUD, STEEN
Applicants: OCE HELIOPRINT AS, HELIOPRINT A/S
Application year: 1988
Main classification: G03B27
IPC codes: G01J1, G03B27