JPS5918940A - Photograph printing device - Google Patents

Abstract

PURPOSE:To vary color density without grade, by using a liquid-crystal or electrochromic color filter as a color compensating filter in an optical path during printing of a photograph. CONSTITUTION:Light 13a from an original 11a passes through a reflecting mirror 13 and a light guide cylinder 14a, and reaches a photosensitive material 21 through the polarizing filter 16 and liquid-crystal or electrochromic filter 17 of a filter part 15a. The filter 17 consists of a color filter A, transparent electrode B, liquid-crystal layer or electrochromic thin-film layer C, and base D and is controlled by a trigger circuit 18 synchronizing with a shutter 14, and a voltage applied through a voltage circuit 19 to vary in color density without grade.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographic printing apparatus. More particularly, the present invention relates to a photographic printing apparatus having a commercially available or electrochromic color correction filter.

Generally, an image is printed on a photosensitive material such as photographic paper or film during a process of printing, and a photosensitive material is exposed to colored light that has passed through a color filter to form each color image on the photosensitive material.

At this time, in order to adjust the color light density, several color filters with slightly different densities are prepared, and the color filters are inserted with auxiliary filters or replaced with correction filters so that the desired color light density is exposed to the photosensitive material. At the same time, I was making exposure adjustments or color correction adjustments.

For this reason, it is necessary to repeat several operations and measure color density before selecting the appropriate color correction filter, and it is necessary to prepare several color correction filters for this purpose. Ta.

Since the color correction filters are the same even if the hues are different, the number of color correction filters for each color is large, which is inconvenient both in terms of operation and equipment management.

The inventors of the present invention have invented a 4A photographic printer equipped with a color filter made of a liquid crystal material or an electrochromic material, as a device for simplifying the handling of this color correction filter.

SUMMARY OF THE INVENTION An object of the present invention is to provide a photographic printing apparatus in which color density can be changed steplessly.

Another object of the present invention is to provide a photographic printing apparatus that uses color filters made of liquid crystal material or the like as color correction filters for each color.

This object is achieved by a photographic printing apparatus characterized in that a manufactured or electrochromic color filter is provided as a color correction filter in an exposure path for imagewise exposing a photographic light-sensitive material.

The photographic printing apparatus of the present invention will be described in detail below.

FIG. 1 shows a specific example of the functional arrangement of the printing apparatus of the present invention. 1 is the original image, 2 is the illumination system that illuminates the original image 1, 2a is the optical path, 3 is the reflector, and the optical path 2a is the shutter 4.
, passing through the lens system 5 and proceeding straight. Reference numeral 6 denotes a decorative optical filter, which is installed in a straight line in the optical path 2a, 7 a color filter, and 8 a delivered filter or electrochromic filter, which are arranged in parallel with the polarizing filter 6. Ninomiya pressure is controlled by the applied voltage circuit 10 and applied to the liquid crystal filter or electrochromic filter 8. Polarizing filter 6, color filter
7. A photoreceptor 9 is set at a lower setting position of the liquid crystal filter or electrocomic filter 8.

In FIG. 2, an example of the configuration of the delivered filter or electrochromic filter 8 is shown. In the figure, A is a color filter, a transparent electrode provided on the back side of the tricolor filter, C is a layer made of a commercial substance or a vaporized film layer of an electrochromic substance, and D is a support (a transparent A transparent electrode provided on E (glass plate, etc.) Color filter A1 Transparent 8A Electrode B1 Layer made of liquid crystal material C1 Transparent electrode D
The printing apparatus of the present invention is shown in more detail in FIG. In the figure, reference numeral 11 denotes a document mounting table, 1]-a denotes a document, and 12 denotes an illumination lamp, which are installed in the photographing section 12a. 13 is a reflecting mirror, 13a is an optical path reflected by the reflecting mirror 13, 14 is a shutter provided in the optical path 13a, 14a is a light guide tube, 1
5 is a lens system. And 15a is part of the filter,
It has a polarizing filter 16, a liquid crystal filter or an electrochromic filter 17 (what is the configuration shown in FIG. 2) inside. 18 is shutter 1
4) ~ liquor circuit, 19 is 1 - rigger circuit 1
8 is an applied voltage circuit which applies an applied voltage to the liquid crystal filter or the electric filter 17, 20 is a filter receiver, and 21 is a photosensitive material.

The printing apparatus of the present invention has the above-mentioned structure, and has the above-mentioned 7.
Since a night filter or an electrochromic filter is provided, the light path 13 from the original f511a
The light a is reflected by the reflecting mirror 13, passes through the light guide tube 14a, and reaches the filter part 15a. The polarizing filter function and light shielding function of the filter part 15a are explained in detail in FIG. 4. In the optical path of the incident light FX and the transmitted light G,
1 ordinary light wave state, J represents the polarized light wave U state that has passed through the polarizing filter surface I5, and +( represents the colored light wave state that has passed through the color filter surface M. The transmitted light G, which is colored light polarized light, is the colored light light 9
tn and reaches the surface of the photosensitive material 'B21. The amount of colored light 11 is controlled by the voltage applied from the voltage circuit 10 to the liquid crystal filter N or the electrochromic filter. Zl, Z2. Z3. Z4 is a polarizing filter grating plane, Z5. ZL:y, Z7. Z8 is the color filter surface, Z9. ZIO, Zll, Zl2 are the delivered filter grating planes or Elek I-lochromic filter planes, xyz, x'v'z2x"y"z':
exemplifies the positional relation of each filter relative to the t-th point. In addition, each filter surface may be separate, and may be laminated|stacked and each may be located in an adjacent position.

In addition, in the case of a filter made of the above-mentioned X"Y"Z German electl cochromic substance, it passes through the polarizing filter surface I! J-polarized light passes through an electrochromic filter. With a polarizing filter, the transmission density decreases to approximately 40% to 50%, and with an electrochromic filter, the transmission density decreases to approximately 70% to 80%, resulting in a color of 9 colors.
The filter functions as a light shielding plate and a color correction filter.

In FIG. 5, the relative relationship between the applied voltage (volt) and the transmitted color light density (Color D) is illustrated as a characteristic of the delivery filter N. The amount of colored light H is the color density (CoI
or D)'s relative @kei, colored light light! It is proportional to the color light density (Color D). Threshold voltage (approximately 4V/c) for aligning the liquid crystal substance in the liquid crystal filter N
m) is applied with a DC electrician (+), C, Volt) to change the degree of orientation of the product material.
Ilz ~ 5 [Transmitted color light density (r, color D
) is exemplified. The application chamber section is controlled by an applied voltage circuit 19.

Incidentally, the relationship between the applied voltage (Volt) and the transmitted color light density (Color D) in the electrochromic filter is illustrated in FIG.

The trigger circuit P, 18 synchronized with the shutter 14 applies applied electrons controlled by the applied voltage circuit V, 19 to the liquid crystal filter or electrochromic filter 17 in synchronization with the shutter 14. Manuscript 11a
The 1#1 general reflected light from The image is formed as polarized light onto the photosensitive batter 21, and exposed and printed.

The material of the polarizing filter used in the printing apparatus of the present invention is a 1/2 λ or 1/4 polarizing plate obtained from crystal, an acrylic plate doweled with a polarizer, or the like.

Further, as the base material of the liquid crystal substance of the liquid crystal filter used in the printing apparatus of the present invention, 8YIAPA (anicylidene paraaminophenylacetate-h) or p-methoxybenzylidene-p'-n-butylaniline and butoxybenzylidene-cyano Nematic liquid crystal consisting of aniline,
(DI)I4-4) -Merocyanine-type dyeing B [2-(
Nematic liquid crystal of 3-methylbenzothiazolidene)-2-butenylidene-3-oxythianaphthane mixture, M
A nematic liquid crystal of a BBA-cetyltrimethylammonium bromide mixture or the like is used. Furthermore, as an electrochromic substance, WO3lMo03ITI
O2, v205. Nb2O5゜WO3-MoO2,Ti
O2-MoO2, TiO2-WO3, WO3-MnO2
-VO system is used.

5. The liquid crystal filter or electrochromic filter used in the printing apparatus of the present invention may be a combination of color filters B (blue), G (clean), R (red) or Y (
By preparing a color liquid crystal filter in which a plurality of mountain-side light filters and a plurality of liquid crystal layers are stacked together as shown in FIG. There is no need for a correction filter at all, just by setting the applied voltage to a liquid crystal filter or electrochromic filter to a certain setting value, or by adjusting the reading of an exposure meter installed in advance on the photosensitive surface. Based on this, dark IW adjustment can be performed continuously by setting the applied voltage, so color correction can be easily performed without any of the operational complexity that was previously required, and printing operations can be avoided, making it more efficient. can be taken as a thing.

The structure of the seed layer color liquid crystal filter is shown in FIG. As shown in the figure, for example, a clay 4° polarizing filter Q1, a green polarizing filter 8, a Rudd polarizing filter T1, a blue polarizing filter U are stacked, and a thick crystal layer R1°+72° is placed between each filter. Set up R3,
A laminated color crystal filter is constructed by providing a transparent electrode B on each filter so that a voltage can be applied to each liquid crystal layer. As an example of its effect, by applying an electric field tEI to the liquid crystal layer R1, blue light is transmitted; by applying an electric field to the liquid crystal layer R1, C,reen light is transmitted;
By simultaneously applying an electric field to the liquid crystal layers R1, R2, Red light is transmitted, and by simultaneously applying an electric field to the liquid crystal layers R1, R2, R3, the color becomes black (opaque).

Hereinafter, the present invention has been mainly explained using a liquid crystal. Then, the electrochromic substance undergoes a reversible reaction and acts as a color filter. ] may be used.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the functional layout of the printing device of the present invention, FIG. 2 is a sectional view showing the configuration of a liquid crystal filter used in the printing device of the present invention, and FIG. 3 is a schematic diagram of the printing device of the present invention. 4
The figure is an explanatory diagram of the state of light waves in the printing apparatus of the present invention, and FIG. 5 shows the applied voltage of the liquid crystal filter used in the printing apparatus of the present invention.
'f! Fig. 6 is an explanatory diagram of the applied pressure-transmitted color light density characteristic of the electrochromic filter used in the printing apparatus of the present invention; This shows a laminated color liquid crystal filter used in In the figure, 1 is the original image, 2 is the illumination system, 2a is the optical path, 3 is the reflecting mirror, 4 is the shutter, 5 is the lens system, 6 is the polarizing filter, 7 is the color filter (including the polarizing filter), 8 is the liquid crystal A filter or an electrochromic filter, 9 is a photosensitive material, 10 is an applied voltage circuit, 11 is an original mounting table, 11a is an original, 12 is an illumination lamp, 13 is a reflecting mirror,
13a is an optical path, 14 is a shutter, 14a is a light guide tube, 1
5 is a lens system, 15a is a part of a filter, 16 is a polarizing filter, 17 is a liquid crystal filter or an electrochromic filter, 18 is a trigger circuit, 19 is an applied voltage circuit, 20 is a liquid crystal filter receiver, 21 is a photosensitive material,
, A is a color filter, B is a transparent electrode, C is a layer made of a finished substance or an electrochromic vapor deposited thin film layer, D is a transparent electrode, E is a support, F is an incident light, and west is an optical path. G is transmitted light, 11 is colored light ffi, I is normal light wave state, ■ is polarized light wave state, K is colored light polarized wave VS state, l- is polarizing filter surface, M is color filter surface, N is liquid crystal filter or electro Chromic filter, P is the trigger circuit, ■ is the applied voltage circuit, Q is the gray light filter, R is the liquid crystal material, S is the clean surface light filter, T
indicates a red polarizing filter, and U indicates a blue polarizing filter. Patent applicant Nobuaki Sakaguchi (and 7 other people), patent attorney representing Roku Konishi Photo Industry Co., Ltd. Figure 6 tot1t2 t3 T 'f, Figure 7 24

Claims (1)

[Claims] A photographic printing apparatus characterized in that a liquid crystal or electrochromic color filter is provided as a color correction filter in an exposure path for imagewise exposing a photographic light-sensitive material.