DE852767C - Device for continuously changing the color and color intensity of a light beam - Google Patents

Description

Device for the constant change of color and color intensity. of a light beam The subject of the present invention is a device for: constant change in color and color density or intensity of a light beam for use in color photography, color film production and color photometry.

It is known to: Change the color of a light beam in the path of the same colored filter, especially with the. Grundiarben. Yellow, purple; blue-green, to be introduced on its own or on top of each other. .

: By changing the intensity of the filter colors using a suitable The same can be set by combining a scale. made of composite colors will; with which the desired color shade is captured with sufficient accuracy. The received Accuracy is up. so bigger; depending: greater the number of different filters chosen However, the color tones are not, -steady.

To: change the color density of color filters, there are already 'filters has been proposed; which has a colored and a white zone at the same time. exhibit. Here, the color density is determined by changing the ratio of the white., Versus of the colored zone within the light beam changed. In:.: In this case, the Change in density be continuous.

By using such a filter set from: different Colors a scale of discontinuous hues is achieved; but their density can be changed.

The disadvantage of devices of this type, apart from that the colors are not continuous, in that, a sentence with numerous Filter So1, Vie - difficult and sensitive manipulations or adjustments necessary are:. : _ The subject of the present invention is now a device with the-one-constant .. change. both- -the color as aucli-: the 'color density' you . Simple and quick handling is made possible: This' device. consists of a single filter, which,.: simultaneously fine-tunes one or more white `find ' or several colored: has stripes. The colored stripes are off. consecutive Color zones @composed ,; which consist of the basic colors or of such colors; each made of two composite basic colors. This filter will in two mutually perpendicular directions. in;' .to the filter level and enables - by changing the various color zones - constant Change of coloration as well as by etit speaking change of color zones against white zones the "constant change in color density. -The law of change in color and the color density is due to the shape of the passage opening for the incident Light beam; by the arrangement of the white or colored zones in front of them. as well as by the characteristic of the incident light beam. The definition "This' legalism enables'-a marking of the colors and their densities depending on the changes in position: des.mobile. Filters as well. the exact" Adjustment of these changes 'according to a fixed graduation:' -According to A simple example of application is the outline of the incident light beam limited by a square window or screen.

The filter .; consists. from - adjacent ": white or different colored Areas, the dimensions of which are the same as the window square: 'is' in the Embodiment of the invention shown. -Fig. i shows the structure schematically a filter according to. the invention; _:.

Fig. 2 is a modified Ausfühxungs.form a filter 'with color zones of different density, Fig .3 "is a - filter using _yön color combinations.';

4 and 5 represents the overall arrangement of a -. Filter device according to the invention, which consists of the filter; and the. Actuating device. ° for its .transfer in. Light beam :::: consists, where: Fig4 -'die., AusBenänsichf .-: and; Fig. : 5 which: shows the interior view with the cover removed; :: Fig.:6 :: 1 to . 9 :. .refer to: f. Application examples of the jifter device according to Fig. 4 and "5. The" filter according to: the rindurig. Consists of a ". Rectangular Area 2, which is in your level in front of a square,: Window I. for: the passage a light beam is displaced.

This ; Filter 2z. possesses - a 'transparent white stripe' 3 and; a .. colored: stripe 4 "which is parallel.am stripe 3-'and au-feinan derfölgende zones the same. Width ;: like: the window i - ;. in. -the- primary colors 7 = yellow; P'-purple; BTX = .. blue-green, owns. "The '.window i. Lies, unchangeable .fixed. : By moving the) filter 2 in front of it in the direction of the arrow A. colored zones past this window. die._Either from a basic color -alone -or from a composition of two basic colors in changing Ratio exist so that all the desired shades of color. can be produced. By moving the filter 2 in the direction of the arrow B, the intensity or density the selected color can be changed by adding a certain mutable and adjustable amount of white is added.

With the specified arrangement, the density of any color from zero to a maximum value of the color zone 4 for the colors I, BV, P of the filter 2 can be changed. It is possible that the extent of the change is correct or insufficient in certain cases and that a scale with increased density -, - or more refined gradation of the. Colors will be required. In order to maintain densities of extended gradations, a series of consecutive zones can be provided, one after the other - a white zone, then a color zone of density D and then increasing zones. Density:. in arithmetic progression, like D, -: 2 ID, 3 D etc. An example is shown in Fig.2.

- . : - Dos' in front of the 'window: i' offset filter 2. has a number of strips 4, 5, .6, 7 of the same width as: the window-, i,; where-each. Streiferi: consists of a series with the basic colors or with combinations of the same. These stripes have increasing color densities D, 2 D, 3 D, '4 D. If the stripe 4 in front of the window is now shifted in the direction of the arrow B, the density is changed from zero to D: Then . is., the strip-5 with the density 2 D progressively felt past the window i, so that the emerging light the. Density 2 D compared to -before D received. This 1 process is repeated "up to the greatest density, e.g. 4 D, in which the window is completely covered by the strip 7:. Instead of the use of colored zones with precisely that: basic colors - such zones can 'also be created by a combination of two superimposed sarbs, such as' B. purple. With blue - green, yellow with blue-green, yellow with purple. The filter 2 can also be made in this way: .dxg adjacent 'zones alternating' from the basic colors - and from a combination of two '' Gründfärbeii @ provided. are: Such an arrangement is shown in Fig. 3. With this arrangement, by moving the filter 2 in front of the window: i -im. . In the sense of arrow A. from one basic color, progressively increasing amounts of one color composed of two other colors are 'supplied' starting from the same; -until a mixture of equal quantities: -both colors has been carried out. By. further displacement of: filter 2, the proportion of the first color is progressively reduced; until then the second color is available alone: -isf; -: wobe.i '; this remains constant. '_. .. _ By moving the filter in the direction of arrow B, a certain amount of white from zone 3 is introduced into the color, so that the color density is changed. A further change in the color density can be achieved in that the colors in a subsequent strip 5 have a density that is doubled compared to the strip 4. Overall, this density can be changed from zero to 2 D.

Instead of providing only two colored strips 4 and 5, you can use also further stripes with triple, quadruple etc .: w. Density be present, like it is the case with strips 6 and 7 in FIG. This makes it possible to use a To achieve an extended possibility of changing the color density.

The filter described above is in a device according to Fig. 4 and 5 attached and used. This overall arrangement then forms a device for a constant change in color and color density in the light beam to be colored introduced, is.

According to the plan view in Figure 4, the filter device consists of a Housing 8 with derri window i. In the interior of this housing, a filter 2 according to Fig. I to 3 with several white stripes or stripes tinted with the basic colors shifted two mutually perpendicular directions. The filter: 2 is on a metal frame 9 attached, the two slide rails i i and 12 offset on a plate io can be. The plate io itself is attached to a plate 13, which in two slide rails 14 and 15 of the housing 8 can be moved.

A lever 17 is hinged to the frame 9 at 16, which in turn is on a on the plate 13 attached axis 18 is rotatably mounted. The lever 17 has between the two points of articulation 16 and 18 there is an extended zone, which at 19 in such a way is left out that the light rays falling on the filter 2 are not covered will.

At the other end of the lever 17, an adjusting button 2o with a pointer 21 is attached, which is "moved in front of a graduation 22," which is attached to the displaceable plate 13. The displacement of the plate 13 is effected by means of a lever 23 which rotates around a pin 24 firmly attached to the housing 8. The lever 23 is hinged to the plate 13 by the pin 24 'and has an adjusting knob 25 and a pointer 26 which can be moved along a graduation 27 of the housing 8. By pivoting the lever 17, the filter 2 in the guides ii; 12 offset and the color shade or the combination of the desired shade in front of the window i. Set. The color shade is indicated on the graduation 22, e.g. B. as a classification with the basic colors J = yellow, P = purple or BV = blue-green or in any other classification.

The color density becomes progressive with a steady addition of white changed to the color zone in front of window i. This change is made by Actuation of the lever 23 enabled and by the pointer 26 on the graduation 27 displayed. The type and accuracy of graduation 22 and 27 are depending on Type of filter and set up as required. In the case of a filter of the type shown in FIG depicted. Art is as an exemplary embodiment the graduation 27 in o to zoo line has been subdivided.

With the help of this arrangement, both the color and the color density also just by pressing button 2o in the direction of arrows A and B at the same time to be changed. In this case, the carrier part 13 of the filter becomes through the lever 17 moved at the same time as it was moved in a mutually perpendicular direction: With this joint drive by the button -go, the lever 23 is also actuated and its pointer 26 is moved along the graduation 27 for display.

In order to facilitate the operation of the device and an immediate Adjustment of the pointer 23 in front of the graduation 22, which is either a graduation according to basic colors or according to an even mixture of two neighboring basic colors has, e.g. B. in Dun'kel, means to enable, approaches can take various forms on the graduation 22 are attached.

Moving the filter 2 in front of the window i can also be used instead of through Lever carried out by means of a threaded spindle, rack or any other type will.

In Fig. 6 to 9 are application examples of the filter device according to .above description shown.

Fig. 6 relates to the production of prints by placing color plates on plates, films or paper. Whether the starting point is negatives with complementary colors or slides with development by reversal for the production of a correct print, it is always essential to correct the color of the light used. For this purpose, a filter device 30 according to the invention or a corresponding type, which has a movable filter 2, is connected to a device 28 of known type for producing prints in front of the light source 29, which preferably consists of an opalescent lamp with good diffusion according to Fig. i to 3 has. The displacement of the filter in the two mutually perpendicular directions is effected by means of the actuating elements described above.

The filter 2 corrects the incident light with regard to chroma and color density. The emerging light beam is advantageously passed through a converging lens 31, through which it is thrown onto the cliché 32 and the paper or film 33. These are brought into contact with the support glass 35 in a known manner by the lever device 34. To increase the diffusion effect, a frosted glass 36 is arranged in front of the support glass 35 in order to ensure uniform exposure over the entire surface of the cliché. Should prints. Especially large dimensions are set up, then it may be sufficient under certain circumstances Use of a single color light source -ht more. The filter device 30 can therefore r this case with multiple windows i for the arch occurrence of the incident light beam is provided in (Fig. 7). A single filter 2 with several sets of white colored filter strips for of the window i provided, the filter only arch a single drive is operated. the willings color zones of the filter enable for of the window i at the same time the same correction. In Fig. 7 such an arrangement is four window i shown. If there is one special Requires a large area to be exposed, but can the number of windows as well as the number of :) calculating sets of white-colored filter strips be diversified. For making enlargements with .lighten the correct shade will be the same Veise using a usual magnification ungseinrichtung proceeded (Fig. 8). Before the ichtqu-elle with white light, which is preferably : e @ icr consists of an opalescent lamp 29, ; if a filter device 30 with movable Ichem filter 2, which through the drive parts 36 ) is operated. The one emerging from the filter 2 ' Light beam passes through the condenser 37, ;) evor he on the cliché to be enlarged at 39 38 hits. Here it is necessary that the filter image formed by the condenser 37 is precisely adjusted in the aperture of the objective 4o. For this purpose, both the lamp 29 and the filter device 30 with the filter 2 are set up telescopically adjustable in height. In order to obtain a good exposure with the greatest light yield, optics consisting of a plano-convex lens 41 can be switched between filter 2 and objective 4o, through which the light beam emerging from the filter is concentrated on the condenser 37, 42.

Instead of adjusting the lamp 29 with respect to the ondensor 37, one can one of the lenses 42 of the latter can also be moved by a drive from the outside.

If desired, diffuse or ball) directed light can also be used be worked by placing frosted glass in .the light beam between filter 2 and Cliché 38 is introduced.

The device according to the invention can also be used for setting a color value and its density with the aid of a comparison method (FIG. 1) by using a comparison device of any type with two light sources 43, 44. Both light sources can be on the same lower part 45 in any desired way, for. B. with rack and pinion 46, 47 can be adjusted. Each light source 43, 44 is provided with a movable filter device 30 : 2 according to the invention. A device with two mirrors 48, 49 arranged at an angle of 45 ° and a common frosted glass pane 5o is provided between the two devices produced in this way, so that the overall device represents a color photometer.

If the two lamps 43, 44 are switched on at the same time, two adjacent surfaces are created on the frosted glass pane 5o, the color and density of which can be continuously changed by the actuators of the two filter devices 30 moving the filters 2.

In order to compare the coloration and the mean optical density of two clichés of the same type (negative or positive) with one another, it is only necessary to apply the clichés to the two surfaces 51 and 52 of the frosted glass pane. By operating the two filter devices 30 , it is possible to regulate the filter colors in such a way that both images are given the appearance of the same mean color.

The adjustment of the lamps 43, 44 with respect to the mirrors 48, 49 is made possible equalizing the mean exposure of these images. This equalization of the exposure can be achieved through the eye or with the aid of photoelectric cells 53.

If you take one of the pictures as a standard, then it is easy and quick possible, just by the constant actuation of the filter device the necessary To get color regulation to get a picture with the second cliché, whose mean color is the same as that of the calibration image.

The ratio of the distances between the two light sources 43, 44 opposite the clichés, which can be determined by means of the graduation 93, 94, gives a comparison value of the average optical density of the clichés. .

If a cliché is used as the calibration image, which can be seen from the previous Try the color corrections and the exposure time necessary to produce knows an image free of predominant hues, then it is possible to use the adjustment parts of the type described above without further delay from the second Based on cliché to get prints, which are also free from prevailing Shades are.

For the production of enlargement prints, in addition to a main enlargement device of the type explained in FIG. 8, an auxiliary magnifying device of the same type is used and next to the image 39 a previously corrected by the filter device Image of a calibration cliché can be projected.

With the help of this color photographic comparison method it is thanks to the continuity of changes in colors and color density possible, quickly and Find the color corrections and necessary exposure times without further delay to make prints from color films and color photographs without predominant hues to manufacture.

It should be noted here that the human eye has the equality of Colors and color density of two colored surfaces exclusively through simultaneous impressions can estimate exactly. With the device according to the invention is in contrast, such an estimate is possible in a particularly simple and precise manner to the previously known devices with inconsistent change, in which the eye is not able to make such an impression on the basis of successive impressions Carry out comparison exactly.

Claims (1)

PATENT CLAIMS: i. Device for the continuous change of the color and color intensity of a light beam by interposing a movable color filter and mixing colored with white light, characterized in that a single filter is provided which simultaneously has one or more white and adjacent one or more colored stripes, the Color stripes are composed of successive zones of primary colors or combinations of two of the same, that the filter is further displaced in its plane in two mutually perpendicular directions in front of a window for the passage of the light beam to be colored and that by alternation .bzw. Transition of the differently colored zones into one another, the constant change in color and the constant change in color intensity or color density is made possible by mutual alternation or transition between colored and white stripes. a. Method according to claim i, characterized in that the filter consists of several adjacent stripes of the same width as the window for the passage of the light beam, one of which stripes is white and the others have an increasing color density. 3. Apparatus according to claim i, characterized in that the filter is mounted on a displaceable support part which in turn is held by a further support part which slides in a direction perpendicular to the first part, that the overall arrangement is further housed in a fixed housing, which has a square window for the passage of the light beam, and that the adjustments of the two support parts are made from outside the housing and are displayed on graduation of the same. q. Device according to Claim 3, characterized in that the filter is actuated in both directions perpendicular to one another by a common drive.