SU1224777A1 - Light mixing device - Google Patents

Abstract

The invention relates to photographic equipment, specifically to illuminators of color photo printing devices. The aim of the invention is to simplify the design of the device. For this, the light hole 3 of the diaphragm 2 is made in the form of a triangle, which, in particular, can be equilateral. The mosaic light filter 1 is made in the form of successive axial and complementary colors fields in the form of triangles with a common vertex and sides in accordance with the color circle, parallel to 1 side of the aperture of the aperture. Additive and subtractive light filters constituting the mosaic light filter are separated from the white light incident on them by the radiation of their corresponding spectral zones. In order to obtain, at the output of the radiation mixing device of the desired chromaticity, the movable mark 4 is set at a certain point of the color triangle 5, and the movement g of this mark can be carried out in any direction and along any trajectory. 1 hp f-ly, 3 ill. (L to bo h vl U /

Description

f

The invention relates to a photographic technique, specifically to illuminators of color photo printing devices.

The aim of the invention is to simplify the design.

Pa figs. the light mixing device is schematically depicted; Fig 2 - mosaic filter; Fig. 3 is a circuit for determining the magnitude of the change in the zonal radiation flux when the mosaic filter is offset,

The light mixing device contains an illuminator, an optical system (not shown) and a mosaic light filter 1 (FIG. 1) installed in the light channel with a printing light beam in front of the diaphragm 2 with a constant light hole 3, the light hole 3 of the diaphragm 2 is made in the shape of a triangle, which in particular may be

one

equilateral. Behind the diaphragm 2 and the mosaic traffic light is located along the light beams, a device for mixing zonal components of radiation (not shown), which can be frosted glass, a light mixing shaft or a raster system. A mosaic light filter 1 is installed with the possibility of translational movement in its plane. With a mosaic light filter 1, a reference mark 4 of color triangle 5 is connected, which may be equal to or similar to a triangle (light hole 3 of a diaphragm 2). In the first case, the connection 6 (Fig. 1) of computational brand 4 with a mosaic filter 1 is rigid, in the second case it is not rigid, realizable, for example, with a pantograph device (not shown). The second option is preferable 5, regardless of size The light apertures of the diaphragm 2 can be set to any convenient size of the color triangle 5. The mosaic light filter 1 (FIG. 2) is composed of light filter sectors of the main and additional colors 7-12 with a common apex. The order of arrangement of colors in the mosaic filter 1 is the same as in the color wheel, i.e. blue 7, cyan 8 green 9, yellow 10, red 11 and magenta 12. Against sectors 7, 9 and P of the primary colors are sectors 10, 12 and 8 of additional colors. Zone ef10

15

20

25

2247772

The effective light transmittance of the filters of the 7, 9, and 11 primary colors are equal to each other and twice the zonal effective light transmittance of the light filters 10, 12, and 8 additional colors. The mosaic light filter 1 (FIG. 2) can be formed as separate light filters 7–12 of primary and secondary colors glued together, as well as with three superimposed subtractive light filters abef, bcde and defa, the rectangular edges of which cf, be and ad intersect in one the point. In the second variant, additional neutral-gray densities are superimposed on the light filters 10, 12 and 8 of additional colors. The abcf, bcde and defa subtractive light filters can be film or formed by interference coatings on the same substrate. The neutral gray coatings of light filters 10, 12 and 8 can also be obtained by vacuum, the Mosaic light filter 1 (FIG. 1) is oriented with respect to to the light hole 3 of the diaphragm 2 so that the sides of the pie filters 7-12 (FIG. 2) are parallel to the corresponding sides of the light hole 3, the Color Triangle 5 (figure 1) is located relative to the light hole 3 of the diaphragm so that m arch 4 is located in the center of the color triangle 5 when the center of the mosaic filter 1 is located in the center of the light hole 3 of the diaphragm 2.

The light mixing device operates as follows.

Additive and subtractive light filters that make up the mosaic light filter are incident on the white light emitted by the corresponding spectral zones (blue, green and red for the additive light filters and yellow, magenta, and blue for subtractive light filters), Light streams passing through the corn. The original light filter is mixed with the help of any color device.

In order to obtain, at the output of the light-mixing device, radiation of the same color, characterized by a specific point on the color triangle 5 (Fig.), The movable mark 4 is set to this point

thirty

35

40

45

SO

of the color triangle 5. At the same time, the mosaic light filter 1 occupies a position relative to the light hole 3 of the diaphragm 2, at which its center occupies the same point of the triangular hole. The emission of one main spectral zone (for example, green) passes only through those cells of the mosaic filter 1, which is adjacent to the side of the light window 3 (or, equivalently, the color triangle) opposite the corresponding (green) top of the color triangle 5. The green radiation flux, a mosaic filter 1 passing through a strip 13 (FIG. 3), opposite to apex G and composed by parallelograms 14 and 15 with G / 2 zonal transmission coefficients and a triangle 16 with a zonal coefficient

When the median light filter is displaced, corresponding to the change in the AX of the x coordinate. counted along the side of the triangle BGR (fng.Z) from the vertex X (to the value Xg., the change in the radiation flux in the green spectral zone d f taking into account equality (1) is equal to

ten

. (-f-.

L

a) X, - (

t (.a) .x, (- () - their (2)

15

20

The product, bracketed in equality (2), does not change when the mosaic filter is shifted and is a constant coefficient of proportionality that linearly connects the variables Dx and LF,.

I 3

Similar to changing the other two

The light transmission is:

.6, P,; x.y.sin 60 °.

 F.g / 2 + X (ax) -sin 60 Rg / 2 +

.-if-. L

/ h / o 2

C / 2 X, sin 60 25

x9 -Cfxy + x - x - xy + x - (-f -.- PV-oi-.

where ,, f

NIN of the green spectral zone, passing through the strip 13, parallelograms 14 and 15 and triangle 16;

X is the length of the side of an equilateral triangle 16;

y is the length of one

sides of parallelogram 14;

a is the length of the side of the triangular light hole 3 of the diaphragm; the flux of the green spectral zone incident on a unit surface area of the mosaic filter 1,

zonal components, the radiation is directly proportional to the corresponding magnitudes of the transceivers of the mosaic light filter 1. The total flux of radiation transmitted simultaneously through the three trapezoidal bands of the mosaic light filter 1, parallel to the three sides of the triangular light hole 3, is the total flux of из ° radiation transmitted through

 mosaic filter I, in accordance with formula (1) is equal to

p (i | -, (). +

 (Zll-) .x

VX ".

+ (, f, “),

(3)

If the values of 1-, c, and c are chosen such that the zonal products of the product, R. g and F-g are equal, then equality (3) can be represented as

45

(i | - (р.С) .а. (). (4)

9.

By expressing the value of x for each strip through its crowd h (the distance from the center of the mosaic filter I to the side of the triangular light-hole of it 3), the expression (4) can be converted to

55

G-1

f - (P.t) .a-- () 1/2 ((J) .a- (),

(five)

Taking into account that in an equilateral triangle, the sum is perpendicular to

When the median light filter is displaced, corresponding to the change in the AX of the x coordinate. counted along the side of the triangle BGR (fng.Z) from the vertex X (to the value Xg., the change in the radiation flux in the green spectral zone d f taking into account equality (1) is equal to

. (-f-.

L

a) X, - (

t (.a) .x, (- () - their (2)

The product, bracketed in equality (2), does not change when the mosaic filter is shifted and is a constant coefficient of proportionality that linearly connects the variables Dx and LF,.

I 3

Similar to changing the other two

zonal components, the radiation is directly proportional to the corresponding values of the crosstalk of the mosaic light filter 1. The total flux of radiation transmitted simultaneously through three trapezoidal strips of the mosaic light filter 1, parallel to the three sides of the triangular light hole 3, is complete

25

p (i | -, (). +

 (Zll-) .x

VX ".

+ (, f, “),

(3)

If the values of 1-, c, and c are chosen such that the zonal products of the article, R. g and F-g are equal, then equality (3) can be represented as

45

(i | - (р.С) .а. (). (4)

By expressing the value of x for each strip through its crowd h (the distance from the center of the mosaic filter I to the side of the triangular light-hole of it 3), the expression (4) can be converted to

G-1

f - (P.t) .a-- () 1/2 ((J) .a- (),

(five)

Taking into account that in an equilateral triangle, the sum is perpendicular to

omitted from any point on the side, there is a constant, equal to the height H of the triangle, the expression (5) can be written as

9 1/2 (t /.). a / n

(6)

proving the constancy of the total light flux transmitted through the mosaic filter.

If it is necessary to change the chromaticity of the radiation at the output of the intended light mixing device, the reference mark 4 (FIG. 1) of the color triangle 5 is moved to another selected point of this triangle. The movement of mark 4 can be carried out in any direction and along any trajectory.

The application of the light mixing device allows the color of the light beam to be controlled in a triangular color table without changing its overall brightness. In this case, the process of controlling the chromaticity of the resulting radiation can be carried out as simply as possible by moving the reference mark to the corresponding point of the color triangle along any (in particular, the shortest) trajectory. This light mixing device can be easily integrated into any single channel channel.

without changing its optical scheme.

Claims (2)

1. A light mixing device containing a diaphragm with a constant light hole located in the light channel and a mosaic light filter installed in front of it with the possibility of translational motion, connected to a reference color triangle mark, characterized in that, in order to simplify the design, the light hole of the D 11 aperture is made as a triangle, and a mosaic filter in the form of successively in accordance with the color circle of fields of primary and secondary colors in the form of triangles with a common apex and sides parallel to the sides of the light aperture, while the zonal effective coefficients of light transmission of fields of complementary colors are equal to each other and twice less than the zonal effective coefficients of light transmission of fields of primary colors. 2. The device according to claim 1, which is a mosaic filter associated with the reference color triangle mark by means of a pantograph device. AND fig.Z