JPS6336232A - Color corrector for color balance adjustment - Google Patents

Abstract

PURPOSE:To correct the spectral energy distribution of a light source in accordance with the sensitivity of a sending material by inserting a light interference filter into an iris diaphragm part of an image exposing lens so that the inserted length can be varied, and changing the inserted length. CONSTITUTION:A color correcting device 30 is arranged between the front side main point surface and the rear side main point surface of the image exposing lenses 21, 22, i.e. on the iris diaphragm part. The device 30 is constituted by applying light interference filters 33-36 for cyanine, Magenta and yellow to the surfaces of colorless transparent plane glasses 31-33 and the areas of these filters 34-36 occupied by the irises of the lenses 21, 22 can be varied. The spectral energy distribution of the light source can be corrected by the area change in accordance with the sensitivity of blue, green and red light included in the sensing material 1. The filters 34-36 have sharp unnecessary light cutting characteristics and necessary light is not cut out, so that light loss is low and deformation due to the heat of a light source or scratches due to handling can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color correction device for adjusting color balance in a color copying machine or the like.

[Back forging of invention]

A static 1F full exposure method is known as a method for obtaining color prints by exposing an image of an original onto a silver halide photographic light-sensitive material. However, the disadvantage is that the size of the device becomes large.

On the other hand, electronic-photography? The scanning exposure method used in M copying equipment η, etc. does not require nearly the same plane space as the original during exposure, unlike the static 2-plane haze method.
Miniaturization becomes possible.

However, when this scanning exposure method is used to print a silver halide color photographic light-sensitive material, the surface to be exposed moves at a low speed, so the sensitivity of the three photosensitive layers of the I-I silver saponide color photographic light-sensitive material decreases. Color complementary IF methods to create a neutral gray according to ?
The ffl method cannot be used.

Therefore, a method is used in which a color correction filter is inserted all over the front or back of the lens, but the sensitivity may vary depending on the brand and type of silver halide color photographic light-sensitive material used, and even depending on the manufacturing lot of the same brand. Because there are variations, in order to achieve the optimal finish, prepare several color correction filters with different densities in advance.
There is an inconvenience in that the color correction filter must be replaced as appropriate depending on the sensitivity of the photosensitive material used.

As a solution to this, for example, Germannan
d Gsell AG -5Co1or -R-
Some printers, such as printers, perform color correction by automatically switching between multiple color correction filters with different densities placed around the lens using a selection button, but this makes the device complex and large, resulting in high costs. . In addition, using a combination of a large number of color correction filters has the disadvantage that flare increases due to scratches on the filter surface and surface reflection, which reduces the sharpness of the flint and results in a substantial loss of light quantity.

Furthermore, dye-coated filters other than optical interference filters also absorb necessary light wavelength components, resulting in loss of sight and also have the problem of not being able to sharply cut unnecessary wavelength components.

[Purpose of the invention]

An object of the present invention is to provide a color correction device that sharply cuts unnecessary light wavelength components and prevents loss of necessary light.

[Structure of the invention]

To this end, the present invention provides a color correction device for adjusting color balance, in which an optical interference filter is inserted into the kJ chromatic diaphragm portion of the image haze lens in a variable amount, and by changing the insertion amount V. The spectral energy distribution of the light source can be corrected in accordance with the sensitivity of the color copy photosensitive abrasive to blue light, green light, and red light.

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a diagram schematically showing an image exposure portion of a color copying apparatus to which the present invention is applied.

A silver halide color photographic photosensitive material (hereinafter simply referred to as photosensitive material) 1 is stored in a roll in a dark box 2, and is pulled out from there between two pairs of rollers 3.3' and 4.4'. They are conveyed while being held between stretched endless healds 5.5', and further conveyed by feed rollers 6.6' and 8.8'.

Then, the tips of the photosensitive material 1 are placed on the feed rollers 6.6' and 8.8'.
When the photosensitive material 1 has been fed a predetermined length from the position of the cutter provided in between, the conveyance is temporarily stopped, and the cutter 7 is operated to cut the photosensitive material 1 into a sheet.

The canted sheet-like photosensitive material 1 is moved by two pairs of rollers 9.9'.
Endless belt 10.1 stretched between and 11.11'
0', then the feed rollers 13, 13' and 14
．． 14', but the feed roller 13.13
' and 14. Images are exposed at the time of passing between 14' and 14'.

That is, a sensor (not shown) attached to the guide 12
When the passing of the photosensitive material 1 is detected, the mist light source 16 is turned on in synchronization with this and starts moving at a constant speed. At this time, the auxiliary mirror 17 and the mirror 18 move at the same speed together with the light R16, and the mirrors 19 and 20 move at the same speed as the light source 16. The original placed on the original platen 15 is scanned and exposed by the light source 16, and the reflected light from the original surface is reflected by mirrors 18 to 20 and an image exposure lens 21. 22, and is projected onto the photosensitive surface of the photosensitive material 1 via mirrors 23 and 24. The photosensitive material 1 image-exposed in this way is transferred to the feed roller 25.
25' and enters a developing processing section (not shown), where a final image is formed.

The color correction device 30 of this embodiment has an image exposure lens 21.2.
It is provided between the front principal point surface and the rear principal point surface of No. 2, that is, in the crimson diaphragm portion. This color correction device 30 includes cyan, magenta, and yellow light interference filters 34 to 36 provided on separate colorless transparent flat glasses 31 to 33, and the area occupied by the lenses 21 and 22 of the light interference filters 34 to 36 in the pupil. changes are possible. 37 is a filter frame.

Therefore, due to this area change, the blue light of the photosensitive material 1,
The spectral energy distribution of the light source can be corrected for green light and red light sensitivity.

Optical interference filters have sharp unnecessary light cutting characteristics, and because they do not cut out the necessary light, there is less light loss, and they are also less likely to be deformed by the heat of the light source or scratched due to handling. . Also, since it cuts heat rays,
It has the advantage of being able to protect the 4A sensations.

〔Effect of the invention〕

From the above, according to the present invention, the spectral energy distribution of the light source can be corrected according to the sensitivity of the photosensitive material, and the unnecessary light wavelength components are sharply cut at that time, and the loss of necessary light deposits is small. be.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the image haze portion of a color copying apparatus to which the present invention is applied, and FIG. 2 is a sectional view of the color correction device. 30... Color correction device, 34-36... Optical interference filter.

Claims (1)

[Claims] (1) In a color correction device for adjusting color balance, an optical interference filter is inserted into the iris diaphragm portion of the image exposure lens in a variable amount, and by changing the amount of insertion, color copying exposure is achieved. A color correction device characterized in that the spectral energy distribution of a light source can be corrected in accordance with the sensitivity of a material to blue light, green light, and red light.