JPS62246032A - Color recording device with filter incorporated lens - Google Patents

Abstract

PURPOSE:To remove color phase irregularity during color correction by a color recording device having a filter-incorporated lens which is a lens wherein plural movable color balance filters are incorporated and provided with a fixed stop nearby the filters. CONSTITUTION:A lens barrel 71 in which a front group lens 64A is fixed and a lens barrel 72 wherein a rear group lens 64B is fixed are mutually coupled by a coupling member 90 so that their optical axes are aligned with each other at the center part. The fixed stop 63F with a window 8 and movable stops 63a and 63b for light quantity adjustment are arranged at the center part of the coupling member 90, and the 1st color balance filter 61 and the 2nd color balance filter 62 are arranged at short principal-point distance opposite each other across the stops. When a copy start switch is turned on, the quantity of insertion of the 1st balance filter 61 is controlled and the quantity of insertion of the 2nd balance filter 62 is controlled next. The stops are then controlled after said control and a light source begins to make an exposure scan. Consequently, color phase irregularity in color correction is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens with a built-in color correction filter for eliminating color unevenness on an image forming surface of a color recording device, a copying device, or the like.

[Background of the invention]

A color copy image is created by projecting image light carrying an image of a color original onto a color photosensitive material, exposing the color photosensitive material, and then processing the color photosensitive material in a processing section such as development and fixing. Obtainable.

In such a color copying apparatus, it is possible to correct the color of the image light according to the spectral sensitivity characteristics of each color of the color photosensitive material, and it is also possible to adjust the hue of the exposure light according to the color tone of the original. In addition, it is required that the hue be actively adjusted to a desired hue.

To control hue for this purpose, three-color filters are inserted in the middle of the optical path, and their insertion IL (ratio) is
A method is adopted to control the

As such three-color filters, filters that block specific hue wavelengths are used. Specifically, there are yellow filters that block blue light, magenta filters that block green light, and cyan filters that block red light. used.

However, if you use all three types of filters like this,
There was a problem in that the loss of light amount became large.

Therefore, the present applicant applied for 3.
A control program that changes the hue of the exposure light without introducing at least one of the color filters into the optical path was used to reduce the loss of light amount.

[Problem that the invention seeks to solve]

However, even though the light loss is reduced by the above-mentioned process 1d, there is a phenomenon in which color unevenness occurs on the imaging plane when the amount of filter introduced into the lens is set to obtain a desired hue.

An object of the present invention is to provide a color recording device equipped with a lens with a built-in filter that eliminates the causes of such color unevenness and allows color reproduction or required hue RR adjustment to be obtained in high-quality images. .

[Failure to solve problem α]

This object is achieved by a color recording device having a lens with a built-in filter, which is a lens with a built-in plurality of movable color balance filters, and is characterized in that a fixed diaphragm is provided near the first filter.

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a diagram showing the exposure part in a color copying apparatus. A color original (not shown) placed on a platen plus 1 is exposed and scanned by a light source 2 moving at a constant speed in the direction of arrow a. The image light obtained by reflection is passed through a mirror 3 that is integrated with the light source 2, and an integrated mirror 4.5 that moves in the same direction as the moving direction of the light rA2 at a speed of 172 times the moving speed of the light rA2.
, and a lens system 6 comprising a lens, a filter, and a fringe, and then enters an exposure window 7.

In this exposure window 7, the color photosensitive material moves in the direction indicated by the arrow in synchronization with the movement of the light source 1, and is sequentially exposed during the movement.

Then, by sending this color photosensitive material to a processing section II for color development, fixing, bleaching, drying, etc., a color copy image corresponding to a color original can be obtained.

Since the fjs2-A diagram shows the details of the lens thread 6 mentioned above, along the optical path C,! m1 color balance filter plate 61
, m2 color balance filter plate 62, fixed aperture 63F, movable aperture 63 and front group lens 64^, rear group lens 7:64[
1 is placed.

As shown in FIG. 3, the first filter plate 61 has a yellow (hereinafter referred to as Y) filter 61Y and a magenta (hereinafter referred to as M) filter 81M on both ends! The second color balance filter plate 62 has a Y filter 62Y and a cyan (hereinafter referred to as C) filter 62C arranged at both ends, and the center has a colorless transparent part 62T. It becomes.

Both filters 81 and 62 are the M filter 61.
The position where the center of M and the center of the C filter 62C coincide with the optical axis C is set as the home button 1, and each of them is moved by stepping motors 65 and 66 in opposite directions of arrows d and e (horizontal direction across the optical path C). It is possible.

Therefore, by controlling both stepping motors Q5 and Et6 appropriately, the optical path C has: (1) No filter...no hue correction.

■Insertion amount of one filter among Y%M%C o~100
%...IMi hue and saturation correction.

■Combination of two of the three types of filters Y%M%C, that is, insertion of each of Y%M [combination of 0 to 100%, combination of insertion amount θ to 100% of each of M and C,
The filter can be inserted by adjusting the insertion amount of each of C and Y from O to 100%.

As shown in FIG. 4, the movable diaphragm 63 is located above and below (
Two diaphragm pieces 63a and 636' are arranged so as to face from above and below (vertical direction across the optical path C). They are configured such that they are controlled by a stepping motor 67 in the directions of approaching and moving away from each other. The home position of the diaphragm pieces 63a and 63b is at a position where the window 8 is completely illuminated, as shown by the dotted line.

In this color copying apparatus, when the copy start switch of the forgery desk is turned on as shown in FIG.
The aperture l is calculated, and when the timer time T has elapsed, the first color balance filter plate 61 is controlled based on the above calculation, and when this control is completed, the second color balance filter plate 62 is controlled by the same calculation as above. When the control is completed, the aperture is controlled based on the above calculation.

After this, the light source 1 starts exposure scanning.

Next, a method of creating a control program for a color balance filter will be described. The fjSG diagram shows the light transmission characteristics of each Y, M, and C filter. As is clear from this figure, the intensity (light amount) of blue (I3) is inversely proportional to the amount of Y filter inserted, the intensity of green (G) is inversely proportional to the amount of M filter inserted, and red (R ) is inversely proportional to the amount of insertion of the C filter.

Therefore, in this embodiment, the operator console is provided with a hue tone g section as shown in FIG. 7, so that each MMC filter can be changed in nine steps from -4 to +4. Also, for the density, a density adjustment section is provided in the same way, and 5 levels from -2 to +2 are provided.
I fixed it at stage 7R.

Color C obtained by each color balance filter plate 81.62
L, is CLo = aoY + I)ON +coc ++
(1) ao: F value of Y filter, :M F value of filter c, :c Determined by F value of filter. The F value indicates an insertion of 1, so each F
The value is determined in advance according to the spectral sensitivity characteristics of each color of the color photosensitive material used, and the hue at this time is used as the preset value.

Note that, as described above, since two of the three types of filters are used, the remaining one type needs to be replaced with the other two types. Therefore, the filter with the smallest F value (the filter with the least amount of insertion) is selected from the other 21! Replace with l. For example, n
If o<50<co, the formula (1) is expressed as follows, so the hue is adjusted using the M filter and the C filter. This becomes the actual preset value of the filter corresponding to the color photosensitive material used.

As a result of the above, color correction is performed using a filter in accordance with the γ characteristics of each color of the color photosensitive material, but if this is to be further artificially corrected, it is necessary to use the hue correction button shown in Figure 7 or the density correction button. Operate the adjustment buttons.

Regarding the filter, the hue CL to be obtained at this time is CL= (ao + a)Y+ (b0+ b)N+(
co + c) Ca: F value determined by the Y buttonb: F value determined by the M buttonC: F value determined by the C button.Here, as mentioned above, in order to obtain this hue CL with two filters , to the other two types of filters with the smallest F value! 2! exchange. For example, (u@+
a) If < (bo ten b) < (co+c), then CL" - (n-+ a) (M + C) + (
be + b) M+ (co + c) C = (IJ, +b-ao-a) N + (co+c -ao -a) C-(3), M
The F value of the filter is "b, + b - a, -uJ, and the F value of the C filter is [co+c -ao-aJ.

At this time, the aperture d is d=do + (, 3 9 - 1, and the underlined part is the coefficient for color correction. [1° is the fringe value set by the button on the density adjustment section.

Therefore, when further adjustment is made using the button on the density adjustment section, d=d'+d6+k6+a, where d' is the amount of correction made by the button on the density adjustment section operated again.

The above program is executed by a built-in microcomputer.
This will be explained in detail with reference to the drawings.

Now, the M filter +2 and the C filter +3 are inserted into the optical path, and the BG
Assume that each color of R is neutral N (FIG. 8(a)). This neutral state is automatically set by inputting the spectral sensitivity characteristics of the color photosensitive material.

For example, a mark indicating the spectral sensitivity characteristics is stamped on a color photosensitive material container, a sensor is installed at the part where the photosensitive material is loaded, and the spectral sensitivity characteristics of the loaded color photosensitive material are detected by the sensor. , the BGR intensity is set based on a preset table value, and in this example, the insertion amounts of the M and C filters are determined so as to match it.

This causes both M and C filters to move automatically, @
The 1:' value is specified when the +2 and +3 buttons of the color correction operation section shown in FIG. 7 are pressed.

Then, the F value at this time is made to correspond to the OTK value of the hue adjustment section. The hue CL at this time is CL,=OY+2M
+3C...(4).

Therefore, in order to artificially correct the hue r shown in FIG.
In the r4 adjustment section, when the M filter button 12 and the C filter button 13 are operated, the characteristics shown in Pt58 diagram (b') are obtained, and all the filters are removed from the optical path, resulting in a state where there is no filter. That is, the hue CL2 at this time
is CL2=OY-28-3C (5).

Next, by repeating the 14 buttons of the M filter and the 14 buttons of the C filter in the hue adjustment section, the characteristics shown by the broken line in Fig. 8(e) should be obtained, but both the M filter and the C filter have already been adjusted. Since it has been completely removed, it cannot be removed any further, resulting in the characteristics shown by the solid line.

The target hue CL at this time is CL % OY-4M-4C (6), and the hue molecule CL of the difference from the characteristic shown in FIG. 8 (I) in the completely removed state is: + CL 2J, that is, a set of formula (6) (
5) is CL ) -CL 2 = OY -28-I C...
・(7) becomes. Here, the smallest coefficient is “−
2", so if you select two types of filters other than the coefficient < M filter, CLi - CL2 = OY + 2 (Y + C) - IC = 2 Y
+ I C (8) This is the hue characteristic based on the maximum value of the currently inserted M filter.

Therefore, we calculated this, controlled the filter machines 61 and 62, and found that it matched this characteristic! The characteristics shown in r58 figure (d) are obtained. However, with this characteristic, the light amount of Blue 〇 is below neutral, which is insufficient for color photosensitive materials.

Therefore, by controlling the fringe 63, the filter is removed by two stages <(-
The aperture is adjusted to increase the amount of light corresponding to 2), and the characteristics shown in FIG. 8(e) are obtained. This characteristic is the hue CL shown in equation (6) above.

Here, the amount of insertion of each filter is finely adjusted almost steplessly, but as shown in Figure 9, the amount of light that passes through a filter set at an arbitrary insertion position depends on the direction. are different. As a result, the photographic density printed on the photosensitive material at the imaging plane is adjusted to the exposure level r17 shown in FIG.
On the surface of the photosensitive material being conveyed, a phenomenon occurred in which the surface of the photosensitive material was sequentially different at the front, center, and rear sides according to the paper surface of FIG. 1. That is, density unevenness is a phenomenon called color unevenness. The cause of this will be briefly explained below.

FIG. 9 is a cross-sectional view of the main part of the lens system 6 of FIG. 1 taken on a plane perpendicular to the plane of the paper including the optical axis.
M filter 61M and fjS of color balance filter plate 61
A C filter 61C of the two-color balance filter plate 62 is set. First, the first color balance filter plate is inserted so that the boundary line of the M filter is at the position indicated by P, and the length from the light entrance side contour frame square hole edge R1 near the filter to P is L2', Light entrance side contour frame square hole edge R1'
The length of transparency g from the bottom to the bottom is Ll. 9th
In the figure, the light beam from the subject B position is cut off by the light-incidence side profile rectangular hole edge R1' and the light-emission side profile square hole edge R2, and is focused at position B' on the surface of the photosensitive material. The length L2 of the transparent portion is smaller than L2', and the length L of the transparent portion is large, so the density of the transmitted light is large and the imaging density of B' is large. In addition, the light beam from the subject position is transmitted to the light entrance side contour hole edge R and the light output side contour hole edge R2r.
The image is formed at position A' on the surface of the photosensitive material, but the length L2 covered by the M filter is 2', which is the length of the transparent part, and ' is smaller than Ll. Therefore, the density of the transmitted light is low, and the image density of Δ' is small, and on the surface of the photosensitive material, from position B' through the center, the distance is about 1 mA'.
111 The concentration gradually decreases as the time progresses. This causes density unevenness.

In the above, m 2 e, for example C of the balance filter 62
A similar problem occurs in the filter 132C, and density unevenness also occurs from the B' position to the A' position. Then, by combining both filters, further density unevenness occurs from position B' to position A'.

Here, the A' position and B' position by the first color balance filter are
The color of the imaging light at position 1) is expressed by 9 degrees, and the density difference is expressed by DA' - DB'.

The degree of color unevenness and density difference varies depending on the insertion amount of each filter, but the larger the insertion amount, the greater the density unevenness.

This is shown in Figures 10 (a) and (b) calculated using the above formula.
This is clear from the density curve and density difference curve of A'B' shown in (c).

In addition, since slit exposure is used in the moving direction of the photosensitive material instead of in the 111 direction as described above, the light beam in the center serves as an image formation, resulting in uneven color density (color unevenness). No worries.

In order to solve the above problem, it is necessary to position the first and second color balance filters between or near the two principal point surfaces of the rear principal point during the excavation of the lens. However, the amphib 71" crown distance cannot be made very large when there are constraints on lens design. Therefore, in the present invention, the colored rfB of the m1 color balance filter plate 61 and the colored surface of the second color balance filter plate 62 are arranged to face each other. Since they were placed close to the principal point plane and almost on the same plane, even though the distance between the principal points was quite short, color copying without color unevenness could be achieved.
As shown in Figure 2-, Figure 2-[1, and Figure 2-C,
A lens barrel 71 to which the 011 group lens 64^ is fixed and a lens barrel 72 to which the rear group lens 648 is fixed are connected by a connecting member 90 at the center with their optical axes aligned. A fixed diaphragm 63F with a window 8 and upper and lower movable diaphragms 63a and 133b for adjusting the amount of light are arranged in the center of the connecting member 90, and first color balance filters 61. m2
A color balance filter 62 is arranged.

Fixed aperture 1) 63F can be attached to the fixed plate 77 attached to the connecting member 90') Upper and lower crest pieces 6 of JJ aperture 63
3a1031+ has the bins 75 and 78, and the bin 75 fits into the guide groove 79 in the Ja li direction of the fixed plate and is slidable up and down, and the bin 75 fits into the guide groove 76 of the row drive slide member 73. is fitted. 1111 The slide member 73 is attached to the side surface 90 of the coupling member 90.
1@1169^, 69B, 96C and the slide member-2 were installed by the stepping motor 67 while being guided by the stepper motor 67 (a, 901). The bottle 75 is moved horizontally by power transmitted by the lever 89D, and the bottle 75 is moved along the guide groove, and the aperture pieces 83a and 63b are moved and positioned in the vertical direction. Furthermore, the side surfaces 90a and 901
Four bottles 81 planted in the connecting member 90 instead of +
It is also possible to use the four guide grooves 82 of the slide member 73.

Also, the first on both sides of the fixed aperture 63F and the movable aperture I) 63,
The second color balance filter plates 131.62 each have:
It is guided by upper and lower guide surfaces 77a of the upper and lower fixed plates 77 and guide surfaces 73a of the slide member 73 so that it can slide in the horizontal direction. And the drive is each third
It is driven by a stepping motor 65,86 shown in the figure. Note that the slide member 77 has a 1y7
40 parts 74 are provided.

Here, fjSl, since the colored surfaces of the second color balance filter are set in opposing directions as described above, it is easy to place the colored surfaces of both filters within a short distance between both principal point surfaces, Color unevenness can be easily eliminated.

In addition, when the fixed diaphragm 63F of the civil power type is provided between both principal point surfaces F, , F2, and the color balance filters 61 and 62 of the first fjS2 are placed on both sides and both are placed between the principal point surfaces, As can be seen in Figure 12, the principal point surface [the light beam effective for image formation in 11 is the aperture 83F] is a prism E whose base is the j-shaped aperture surface.
The optical axis will be passed manually through the FG I-[. Then, the square hole edges R5, RI' R2, R2' are located at the front side B' position 1n of the photosensitive material imaging surface, the central part C', and the rear side A'.
The color density of the imaging light at is constant without change. Therefore, color unevenness is eliminated.9 Moreover, in this case, the filters do not need to be arranged with their colored surfaces facing each other as shown in the multi-layered embodiment, and the filter only needs to be placed between the principal point surfaces. If the loss of light If tri is not so much of a problem, the color correction means shown in this embodiment can be replaced by three filters instead of two color balance filters and no difference in color density will occur. Therefore, the effect of providing a fixed aperture between the plurality of filters between the main χ planes on color unevenness is significant.

By the way, the chromaticity for the state of countermeasure music as shown in Figure 9 where both M filter 70% and C filter 70% are inserted, and M70% insertion, M70%,
2nd-Al, @2- as in each case of C70% both insertions
The chromaticity after the countermeasure shown in the It diagram and Figure 2-C was measured with a chromaticity meter and plotted in the chromaticity diagram shown in Figure 11. It can be seen that the difference in concentration has been largely eliminated.

〔Effect of the invention〕

Colors that may occur during color correction of color recording devices, color copying devices, etc. by the color recording device of the present invention, which has a lens with a built-in filter that has a fixed aperture between principal point planes and between a plurality of color balance filters. It can eliminate unevenness! Ta.

[Brief explanation of drawings]

FIG. 1 is a color copy vcW1 of an embodiment to which the present invention is applied.
Figure 2-1 is a cross-sectional view of the lens system in Figure 1 taken along a horizontal plane that includes the optical axis; FIG. 2-C is a XX view of FIG. 2-I1, FIG. 3 is an operational configuration diagram of the first and second color balance filters, and FIG. The figure is a diagram of the operation configuration of the aperture, the Pt55 diagram is a timing chart of each operation, Figure 6 is a transmission characteristic diagram of each Y%M%C filter, fiS7 is a diagram of the configuration of the hue 11 adjustment section on the console, and Figure 8 9 is a diagram of the change in hue characteristics when changing the hue adjustment operation input, FIG. 9 is a diagram of the principle of occurrence of color unevenness, and FIG. 10 is a curve of density change and density difference change of imaging light due to change in filter insertion amount. FIG. 11 is a distribution diagram of color saturation on the front side, center, and back side of the photosensitive material before and after countermeasures against color unevenness, and FIG. 12 is a diagram showing the principle of N measures for eliminating color unevenness. 1...Platen glass 2...Light source 3.4
, 5...Mirror 6°°°lens system 61.
...First color balance filter plate 62...Pt52 color balance filter plate 81Y, 62
Y,...Y filter 61M...M filter 62C...Y
Filters 61T, 62T - Colorless transparent part 63... Movable aperture r) 63m, 63
b...Aperture piece 63F...Fixed aperture 64^...Front group lens 64B...Rear group lens 65.66.67...Stamping motor 69^, 69B, 69C...Gear 690
... Hook 71.72 ... Lens barrel 73 ... Friction piece drive slide member 73a ... Guide surface 74 ... Opening tr675.78.81 ... Pin 7
6.79.82...Guide groove 77...Fixing plate 77a...Guiding surface 90...Coupling member 90a, 90b...
・〃Ideface Applicant Roku Konishi Photo Industry Co., Ltd. Figure 3 Figure 4 Figure 5 Figure 01゜ Figure 6 Figure 7 000000000 Y(B) 000000000 M(Gl ○OOOOOOOOOC(R) Leak-111-- -Busho (a) Figure 8 (c) (b) (d) Figure 9 Ring tnnax dark, t, i. Figure 11 ('/ELLOW) (BLUE) R: Filling side 1Q Figure %LZl

Claims (1)

[Claims] 1. A color recording device having a lens with a built-in filter, characterized in that the lens includes a plurality of movable color balance filters, and a fixed aperture is provided near the filter.