JPS63281148A - Exposure control method and apparatus for colored copy - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and a device according to the preambles of claims 1 and 2 of the patent claims.

[Conventional technology]

A method and device of this kind is described in German Published Application No. 3437
No. 222. This publication suggests a copying device in which the film to be processed has marks (particularly edge markings) which can be scanned in a three-dimensional arrangement for each original to be copied, said marks being formed during a prior manipulation process. The process is carried out using known automatic equipment. However, in this case, a stamping device for edge marking of this type is present in the copying machine at a corresponding location near the copying station, and each image position after automatic transport over a predetermined stroke length is determined by the actuation of the punch. Films without edge markings of the type described above can also be processed if supervised by the operator. However, it is difficult to incorporate the punch near the copying window, and the operation method that involves macroscopic image position adjustment when scanning the entire film involves a great deal of time wastage.

In known devices during the return journey of the film during the copying process, when tracking edge markings, it is often the case that the corresponding image characteristic value measured and stored during the first process and the original characteristic value, which is the same for the entire film, are present for each original. The copy data is calculated and becomes the basis of the copy process. This requires accurate memorization of the ordinal number of each original to be copied when only a single original is to be copied using automatic settings.
Requires a complete analysis of all original copies present on the film.

[Problem to be solved by the invention]

The problem of the present invention is that the film is not provided with edge markings.
It is to be possible to process all copyable originals, which are not intended for copying, without the additional disadvantages of complete analysis on film or subsequent edge stamping.

[Means to solve the problem]

According to the present invention, the above problem is solved not only by the color density values (original eigenvalues) of each original to be copied, but also by the color density values (original eigenvalues) of a large number of originals of the same film, which are obtained by regional pre-scanning.
In the exposure control method for colored copying, the exposure control method for color copying calculates the copying light dose in three colors based on the film eigenvalues) and performs scanning at the copying station over time during the copying process from the first process to the second process. The process is solved by only measuring the film eigenvalues over the length of the film, and by carrying out the measurement of the original eigenvalues at the copying station after centering the original to be copied and in each case before copying exposure. The measurement of color density values in the whole film to determine the film characteristic values during the first process also
This is possible without attaching an accurate measurement area to the original copy. Furthermore, by analyzing the measurements from individual original document areas, areas with high transparency to which image stems should be attached can be excluded from the analysis, for example according to the teachings of DE 28 40 287 A1.

The Tamenofilm characteristic values for calculating the three copying light doses for each individual original are the same for all originals of this film, and there is no need to record to which original this value corresponds, preferably for example during the first process. During the second process of the film to be copied in the reverse direction, for example, after the operator has centered the copy original in the copy window and before starting the copying process, the original eigenvalues are measured and applied to the entire film. It is associated with the calculation of three types of color copying light doses together with the corresponding film eigenvalues. These three types of color copying light doses need to be calculated only for the original that is actually copied. Since the operator centers the original on the copying window before copying, there is no need for marking equipment attached to the image position, and additional installation is possible in some cases.

The apparatus for carrying out the method according to the invention is such that the scanning device is equipped with a partially transparent mirror or a swinging mirror, which always remains in the active position during the measurement of the film characteristic values, and which is moved through the copying window of the copying station in each case to measure the original characteristic values. It is characterized in that it can be moved to the working position between the positioning of the original and the start of the copying process.

〔Example〕

Other features and advantages of the invention will now be explained in detail by way of example embodiments with reference to the accompanying drawings.

The illustrated copying device is described in German publication No. 3437222.
It corresponds in essential outline to the device described in No.

Therefore, in order to best understand the differences with the device according to DE 34 37 222, only a sectional view of the film transport device according to the viewing direction is shown.

In the drawing, reference numeral l indicates the optical axis of the imaging beam path in a conventional copying device, and a lamp chamber (not shown) with color copying ability is provided in the mirror-shaped hole 11 to uniformly distribute the light to the original table. Supply to 2. This will be explained in more detail below. The original 10 located on the original stand is imaged by a zoom lens 24 onto a photosensitive copying support (not shown), in particular colored copying paper.

The original table 2 is provided with two rails 8 and 9 for supporting the edges of the film, the grooves of which are such that the border guides the side edges of the film. The film strip 10 is free to move together with the original on the rail 8.9 in its longitudinal direction. However, the rail 9 on the side opposite the operator is provided with a notch in which the pair of transfer collages 20, 21 are engaged. The lower roller 21 is freely rotatable about a fixed axis, whereas the upper roller 20 is connected via a shaft 19 to a gear belt pulley 17 which, via a gear belt 15, is connected to the gear belt pulley of the electric motor 12. 12
connected to b. The motor 12 is mounted on a support 13, which can be pivotably arranged on a cradle for removing the transport roller 20 from the film.

Above the opening for the original to be copied located between the rails 8 and 9, a pressure plate 3 is arranged on the rear rail 9 so as to be pivotable about an axis parallel to the longitudinal direction of the film. The pressing plate 3, which can also form as an opening a U-shaped retaining support for the side edge of the negative to be copied, supports an arm 9a on the other side of the bearing axis and connects it to the bell crank 6 with a rod. Connect via 4.

The bell crank 6 is similarly fixed to a frame and supported so as to be rotatable about an axis parallel to the film transport direction, and a mirror 7 is supported on the leg portion 6a on the apparatus side. The other leg is provided with a fork-like slit guide, into which the bottle 5b is inserted.
This arm 5a of the 0-rotation magnet can be rotated approximately 120° clockwise, and based on the transmission characteristics of the pin/slit connections 6b, 5a, 5b, the mirror 7 can be copied It is pivoted away from the region of the imaging beam path of the device. The arm 6C, via the connecting rod 4 with the rotation of the mirror 7, is brought into a plane pressing state of the film via the arm 3a angled with respect to the pressing plate 3.

In its operating position (that is, in its swiveling position), the mirror allows the light coming from the mirror hole 11 to enter the zoom lens 22 through the original 10 together with information, which zoom lens forms a reduced image of the original onto the photoelectric device 22. image window. This optoelectronic device consists of three measuring cell scanning lines juxtaposed as closely as possible to each other, which receive the original strip running transversely to the film transport direction, taking into account the deflection by the mirrors. The measurement cell scan line 23 is sensitive to each of the three basic colors through a corresponding colored filter and is approximately 1/15 of the length of the original image in width. Receiver 2
3 are arranged on skids 16 which are movable in the direction of film travel, and which skids are movable by motors 18 over the length of each original image. The objective lens 22 is a zoom lens, and is capable of forming images of various different original document compositions on the light receiver 23 in a sufficient manner.

The mode of operation of the above device will be explained below.

This device is particularly suitable for processing individual film strips that do not have edge markings attached to the individual image areas. The operator, located in front of the device on the right side of the imaging, introduces the beginning of the film strip between the transport rollers 20 and 21, located perpendicular to the support plane on the rail 8.9. Thereafter, the motor 12 of the transfer section is energized. The measuring cell scanning line 23 remains unchanged in its initial position during the first scanning process, in which the strip is impinged by the light beam along the entire length corresponding to one of the side edges of the original window. The lamp chamber makes white light incident on the original copy through the mirror well 11, and sequentially images the entire area of the original copy on the film onto the measuring cell scanning line 23 through the objective lens, while the film is being moved by the rollers. 2o, 21
and a motor continuously feed the receivers arranged there from the left side to the right side of the device into the device. The response cycle of the measurement cell scan line is controlled synchronously with the transport speed of the motor 12;
The measurement area on the film is scanned in complete order.

Extremely transparent areas, such as at the beginning of the film or in the image stem, can be excluded from consideration by corresponding programming of the analysis computer. After passing, all measurements in three colors of all films are stored in memory. This memory calculates values for so-called film hardness, for example according to the teachings of DE 28 40 287 A1.

During the copying period following the roll, the entire or individual original of the film strip is moved to the copying position via a morph film transport 2o, 21 with monitoring and control by the operator, or the film is moved to the copying position in the conventional manner. It is also possible to move the original from the front under the pressing plate 3 until the original to be copied is located in the original window. Mirror 7 to start the copying process
is still in its active position (the position shown). The mirror thus projects a reduced image of the original to be reproduced via the objective 22 in the area of the measuring cell scanning line 23 .

In the starting position of the measuring cell scanning line 23, these are, for example, the zero-order motor 1 located at the left-hand edge of the original image.
8 moves the measuring cell scan line 23 above the original image, thus providing the computer with measurements of all three colors in the entire area of the original to be copied (i.e. the basic position for calculating the original eigenvalues) 0 From both numerical values, a calculation of the copying light dose is then carried out in three colors, which is limited, for example, by the rotation of the subtractive filter in the white copying light path of the lamp chamber. ? J [Magnet 5 before starting the copying process.
When the mirror 7 is energized, the mirror 7 is removed from the copying beam path by a clockwise pivoting movement of the arm 5a. At the same time, the original is placed in a precise plane position by the pressure plate 3 to provide a sharp image to the copy material. During the measurement, a plane position defined in this way is not required in the imaging plane, since the measurement range is approximately 1/10 to 1/15 of the original dimension, and within the range of parentheses it is possible to easily integrate due to defocus. This is because it can be converted into

After the exposure or three-color exposure is completed, the mirror 7 returns to the position shown and releases the film pressure.The movement of the film until the positioning of the zero-order original to be copied can be performed, for example, by an operating tool. The copying process can be carried out on the entire original to be copied on film, and no position markings are required for this purpose.

The operator's observation of the original takes place via a corresponding opening in the mirror well 11 or by branching off the partial beam path behind the objective 22 to a suitable viewing device.

The periphery of the mirror 7 is designed in a reflective manner so that it can also perform a closing function. However, a further closure can also be provided behind the mirror.

This swinging mirror 7 may be replaced by a partially transmissive mirror that is fixedly arranged if sufficient light intensity is not required for each of measurement and copying.

The relative shift between the original imaging and the measurement cell scan line 23? J.J.
can also be realized by a corresponding rocking system for the mirror 7.

However, instead of the measuring cell scanning line 23 on the skid 16, it is also possible to provide a mesh system of measuring cells 23'', in which case the objective lens and the measuring cell mesh 23''
In addition, a de-halo having three colored filters of the three primary colors is additionally placed between the two.

During the first pass of the film, a correlation between the film transport by the motor 12 and the film fragment size, which is approximately the length of the original copy, is required. In this case, rationally motor 1
2 is constructed as a stepping motor, which performs a number of transport steps corresponding to the image length and then commands via the computer the measurement process of the entire image area of this film segment in all three colors. For this reason, it is often necessary to replace the colored filter in the measuring beam path after the scanning process. These measured values are fed into memory. After the measurement is completed, the film is transported again over the path length corresponding to the image length.

This then does not play a role in the presence or absence of image stems in the currently scanned measurement region, which, as mentioned above, can exclude such values in the analysis by forming corresponding dark values.

To measure the original eigenvalues, motor 1 is activated immediately before the copying process.
8 does not require any movement of the measuring system, but rather, by centering it with respect to the image window of the original to be copied, the area of the original currently being measured is moved by the photoelectric grid system 23.
° imaged on.

Of course, the measurements are repeated three times, each time with one of the other colored filters interposed.

Three successive scans can also be avoided by arranging a dichroic beam distributor in the measuring beam path and a basic color-sensitive measuring cell array 23' behind it.

For the method described above, instead of a subtractive lamp chamber it is also possible to use an add-on with three light sources for each color or with one light source and a replaceable additional filter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the copying apparatus of the present invention outside the copying window, which is equipped with an observation device in the direction of film transport. 3-Holding device 7-Mirror 10 Original 16-Skid 20.21-Film transport device

Claims (7)

[Claims] (1) Copying light dose in three colors based not only on the color density values (original eigenvalues) of each original to be copied obtained by regional photoelectric scanning but also on the color density values (film eigenvalues) of multiple originals of the same film. In the exposure control method for colored copying, in which the scanning at the copying station is performed over time during the copying process from the first process to the second process, the first process only measures the film eigenvalue over the length of the film. and measuring the original eigenvalues at a copying station after centering the original to be copied and before each copy exposure. 2. An apparatus for carrying out the method according to claim 1, comprising: a copying station equipped with a device for regional photoelectric scanning of an original; and a storage device for measurements of a large number of film original copies; The scanning device is equipped with a partially transparent or oscillating mirror (7), which always remains in the active position during the measurement of the original, and which is used for positioning and copying the original (10) in the copying window of the copying station, respectively, in order to measure the original original values. A device characterized in that it can be moved into the working position between the start of the process. (3) A scanning device images the original (10) behind a mirror (7) on a system of three parallel measuring cell scanning lines (23) sensitive to each color, which act as measuring devices. an objective lens (22), and the measuring cell scanning line (23).
) is placed on a skid (16) that can move in the longitudinal direction of the film over a path corresponding to the length of the original image, and the skid (16) is kept stationary in order to measure the film eigenvalues, and the film is continuously transported by a film transporter. In order to transport and measure the image eigenvalues, the copy original is held stationary in the copy window and the original is imaged relative to the measurement cell scan line (23) by moving the skid over the image length or by rotating the mirror (7). 3. Device according to claim 2, characterized in that it is capable of relative movement. (4) Claim characterized in that the measuring device is one or more planar arrays (23') of photosensitive cells, in front of which another measuring filter can be installed for each color measuring process. The device according to item 2. (5) The copying window has at least one
5. Device according to claim 2, characterized in that it is provided with two holding devices (3) and a viewing device for originals. (6) The device according to claim 5, characterized in that the holding device (3) for original documents and the swinging mirror (7) are connected so that they act alternately. (7) A motorized film transport device (20, 21) is arranged in parallel to the copying window to operate when measuring film eigenvalues, and the transport device can be adjusted back and forth manually during the copying period, or the film is transported manually. 7. Device according to any one of claims 2 to 6, characterized in that it can