JPS58178689A - Image pickup device - Google Patents

Abstract

PURPOSE:To improve resolution, color reproducibility, sticking accuracy, etc., by placing plural saturation filters in front of a picture element, and placing a filter of the same color in front of a boundary in the prescribed direction of the picture element or its vicinity. CONSTITUTION:A complementary color filter is constituted of plural saturation filters, and also a boundary between this complementary color filter and other adjacent filter, or its vicinity is made to have the same color. In this way, by using many filters for forming a complementary color as a color filter, substantial sampling frequency is raised even in case of an object to be photographed, whose color saturation degree is high, and folded distortion is reduced. Also, a sticking error of the filter to the image pickup element can be offset by the same color filter provided on the circumferential part of this picture element. Also, a numerical aperture of the picture element is improved, and the sensitivity is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION This is a personal writing device that has been modified to include a nine-color separation layer filter.

For example, an image AM device with 684 elements in the horizontal direction and 490 elements in the II direction is applied to a black and white camera. And, due to this horizontal series of tarotsuta granite ridges, debris from lenses etc.
1 in IL interval f'4 (L!-= 158 Mklm)
It can be even superior to a small extent, and if you increase the weight of the existing receiver, the horizontal Jg1 fK will be the name of the era.

In this way, add the miscellaneous image device to 1 in red (R), edge (G) l (B
) If we configure a 5-panel type camera by providing one KW for each color, we can obtain high-quality resolution and color re-challenge like a 6-tube type camera using 3 image pickup tubes. It gets cloudy.

However, the configuration and adjustment of the three-plate type optical system for color separation are complicated, making it difficult to miniaturize the system, and it is difficult to expect a reduction in price. In such a home-use camera, there is a single-panel camera that uses only one image device and is being developed.

However, K has to overcome many problems as follows. First of all, if you think about the resolution, color cameras will be able to handle Sm color, wholesale red light, green light, etc.
Green light [Membership fee applies. Therefore, in the single-panel type, these three primary colors are j
I have to allocate it to Todoroki.

Color separation@filters are used as a method of distributing the three primary colors, but these can be roughly divided into Bayer distribution! There are two types: a Mozuita filter method called 44E, and a stripe method in which filters of the same color in the fI direct force direction of the solid-state imaging device are arranged.

Here, to simplify the discussion that follows, we will use Kl(, G, B
Color #11 of the stripe method! Let's think about it.

In this case, the number of number printers J11 for each color in the horizontal direction is]
fc2 is 2.4MHM, and the color signal range @ u is approximately 1.2
MHz. Therefore, if a luminance signal is created from this color signal, the image quality will be as low as l/'3 of a monochrome camera.

NT, SC in such a) i, t, ;, B stripe method
In order to cover the horizontal layer of 111ft corresponding to the direction, it was necessary to significantly increase the horizontal height of the Hata Ritsu device (<
Le. However, even in the equipment device of Fuki 1 Yu, it is about 584'
X 490'% (approximately 200,000 Okimotoko's number is distributed, and even with the current LSI technology (lIt), it is #llk1m- to make this about three times as much as a cake. This is a method using the ilK horizontal confectionery disclosed in Japanese Patent Application Laid-Open No. 56-120281, which is increased by about 50% to about 57L, and uses a color separation filter shown in Figure 1.

41 mold in this method is to change the color separation layer filter to R, and from B to R.
, G, and cyan Oy (Or2B0G), and R74 of No. 911 obtained from the imaging device when photographing a white subject.
#FR, 7FQ to G74, signal level corresponding to phototravel transmitted through CyfihpFcy is configured to be 1:1:1, and stW signal is obtained directly from this signal, horizontal solution is obtained. I am grateful for improving my peace of mind0
However, this salt theory holds true if many common objects have very low saturation.

As shown in Fig. 3 (1) of Konchi Theory 3, a black and white subject image of a subject with low chromatic wrinkles is assumed to be #'filL (color 11). However, according to this method, the color saturation is A high object image has the drawback of aliasing distortion. When a single-color copy (a red flower) is imaged, the spectral distribution of the circumference is set to 1, and the gM bud castle is the second. Assuming that the bandpass filter LPF1 in FIG. 1 has nine chains, the frequency of the frequency difference depends only on the red signal, so the frequency of the frequency difference becomes 1fC1.

Then, in the output signal of the solid-state imaging device, a baseband signal (-sum) and a third-order band value B, etc., which occur at 3/e1, are generated.

However, the low-pass filter LPif' for obtaining the luminance signal
1 installed FiiE2al! As shown in Figure 11, it has a wide band, so Figure 2 (the diagonal lined part in the noodles and the filter L)
PFAlso, if we consider the color reproduction properties of the above-mentioned method, as shown in Fig. 6(a).
, Fm, Fcy*The spectral sensitivity of the Stoffig filter is limited by the spectral sensitivity of the infrared cut filter for red light, and the sensitivity for cyan light is G.
The spectral sensitivity of GD is affected by one chain due to the bone, so the overall spectral sensitivity distribution of this imaging device is red.

The transmittance of each color filter must be set in advance so that a nearly uniform sensitivity distribution is obtained for both green and cyan. The signal Scy corresponding to the nine lights passing through the filter FC7 of
Since the blue color signal Ss is obtained by subtracting the signal S corresponding to the nine lights passing through the green filter y- from
As shown in J, the sensitivity distribution of the blue border and the sensitivity distribution of the edge filter must be synthesized so that the sensitivity of the suture becomes uniform with red and green.However, with the conventional cyan filter, Since it has a W& degree distribution as shown in Fig. 6 (&), the blue color gi No. Sa obtained by the above-mentioned correlation processing is different from the signal that should originally be obtained from the actual color film, and the color The disadvantage is that the re-flyability is significantly reduced.

Next, consider the bonding accuracy between the imaging device and the color separation filter.

Interline as an imaging device! ! 1oCD(I
L type), 7-frame transformer 7-frame G (3D (F'l'm
), MOS [etc. 46 is 1. :, , : Ted F T
IjlGC; Do a94 using D 〇 Figure 4 is an enlarged view of a part of the imaging section (light converting section) of the FT type (3GD), (#1! Jii 1 bale connected) 6 is the horizontal direction between the elements. It is an abbreviation of Channel 2 Tosoba which prevents the diffusion of lightning. This is the color #1! Filter shown in the diagram is attached to it. LS#'i is a light spade that does not transmit human light, and ay, R, G stock each ay light/R
In the color jli filter corridor that transmits light and G light, the b0zu channel stopper @4 is generally arranged in a ring of 2 to 6 units.
Light Layer LSij Tsutomu Channel Stotsumato lIIJImK
The 6 and LS are in the shape of each other, and the combination is made so that the 6 and the LS are completely aligned.

However, there are very difficult problems in increasing the accuracy of the true-to-edge lamination.

Wholesalers also have a table of dimensions N for mechanical imaging elements for lamination.

Pasting by moving the router (errors may occur).

Due to the lamination X*, the corner and fG filter S overlaps the m image confectionery part of the R filter part, which causes color mixture in the color signal caused by electric circuits, and color re-vortexing is caused. I want to make it narrower (I want to make it narrower).

This is because the channel stopper 6 has the light receiving sensitivity of AT, so by increasing the (light receiving) aperture ratio of the camera lens, the overall sensitivity of the camera is increased. Fibrous color separation filter Fi resolution one color P4 maple property, lamination? The present invention is to provide a jail vehicle having an excellent filter structure that eliminates the various drawbacks of the prior art. In order to do this, the present invention uses color fill! - By frequently using filters to form complementary colors, even for subjects with high color saturation, it is possible to substantially increase the number of printer revolutions and reduce aliasing distortion.
The filter for forming this complementary color is composed of a combination of a plurality of pure color filters, and has its main ate image at nine points.

That is, even if a KB filter is used instead of a dCy filter, and a 0 filter is used, the spectral II# characteristic of the complementary color filter can be arbitrarily set by j# placed in different regions, so the correlation with the signal from the pixel of Rin is When processing, the correct color^ style can be created.

Furthermore, according to the embodiment of the present invention, the complementary color filter is formed by a plurality of finely divided pure color filters, so that false signals are less likely to occur even for 4-body components with high spatial frequencies.

In addition, by configuring the brown filter with multiple pure color filters in this way, by appropriately setting the area ratio of each pure color filter to the complementary color filter, the correlation with the koji pixels can be improved. It has characteristics such as being able to be used for kj1.

Furthermore, according to the embodiment of gA5Ili1 of the present invention, when the IIIJliilK complementary color filter of a predetermined pixel is arranged, this complementary color filter is composed of a plurality of pure color filters, and the l1ill! Since filters of the same color are arranged at or near at least one pair of ends facing each other in the peripheral area of It slows down because it can be offset by a filter.

In addition, since the same color filter is placed in the # direction at or near the border in a predetermined direction of the drawing slip, the aperture ratio of the book is improved and the sensitivity is increased.Also, the high frequency components of the subject are relatively cut. It will help you practice your life.

Hereinafter, the present invention will be described in detail based on embodiments. Figure 4 shows a frame transfer section 11/several examples of the solid-state sensor according to the present invention. (Po1l-3
2 is a photoelectric conversion unit, and 3 is a channel stopper. This ass child's horizontal valley channel stop top K[1fi transparent part L
The filter and each 111&lIX are aligned to the square where S is placed.

Diagrams 5 (IL) to - are diagrams showing configuration examples of the color separation @ filter of the present invention, and among these examples (the cap - (・) indicates the R, G, and ay methods of the present invention. Cyan filter 1 is applied as a complementary color filter.
An example is shown in which a 'c7 t B filter and a 0 filter are combined.

Fa is a growth filter, rθ' and F. are edge filters having the same spectral sensitivity, and Fllti red filters, which are arranged in the combination -fi- period as shown in the figure.

In other words, the cyan color filter Fcy is placed on the same #11R as the cyan color filter Fcy. !The spectral sensitivity Ftri characteristics of !- are intimidated by Fi!-. It is possible to easily obtain a sensitivity distribution for the cyan color similar to the one shown in Iris 5m!1 (b).

When this color filter is used in a photographing device, it is possible to provide Jl#j111 with a color that has good color recoloring properties.

It goes without saying that the application form for the direction, filter Icy, Fs, and F skin is not specified even though it is an illustrated image.

IK5 diagram (lel ~ (・) is an example where the cyan filter is composed of many G noise filters and B filters. !A (c) is an example of a horizontal stripe pattern, -Figure (1) is an example of a mosaic pattern, and (θ)a is an example of this further subdivided. Figure (fld)
It is a diagram illustrating a filter applied to a mosaic filter used for OD, etc., and is composed of a cyan filter fBy illumination and an 0 filter of the above-mentioned itafilter.

Although these examples show only examples in which the cyan filter is composed of a pure color B filter and a pure color G filter, the present invention is not limited to such colors, and can be applied to all complementary color filters. For example, instead of using a transparent filter, a KR filter~,
It also includes replacing G filters and B filters with appropriate combinations.

Figure 5 (- indicates a transparent filter like this [including the filter Sakaki Iga], and X indicates a cyan filter, YVi
G filter and Z are white hair filters.

As shown in these examples, according to the present invention, the spectral characteristics of the Fi complementary color filter can be easily set. improves.

Next, Figure 6 shows another embodiment of the present invention, in which - a color layer filter [consisting of a plurality of pure color filters; In this example, O
Consider a stripe-type color separation filter consisting of a combination of a y filter Jj (Ye) filter and a G filter.

In the figure, C61 to C34 are respectively arranged at the rear of the filter 7.
5GCD channel stock *tt table bf.

As shown in the figure, the B and G filters are applied to the own troops between Channel Strike V 081 and C8z, and the result is E? ]
It is said that the output of the K ay filter is very good.

Also, if you think about the one between 381 and Cs2, the horizontal edge of this - vote will be
(Since A31 and C82 and their surrounding areas P and Q are covered by a G filter of the same color, even if the color separation filter is shifted by 9 in the direction of the arrow, on the peripheral parts P and Q of the - element. The logic direction of the G filter #'i does not change.

Therefore, when the filters are disposed in the same position as each other, even if there is some deviation, there will be no adverse effect.

This fist is also 51 for Y filter 11 in the figure!
! The same can be said about the TD G filter.

That is, G 74 k /-4gG33 0E34 r
J upper K 4 Since the G filter is applied (・ru, even if there is a positional shift of the fill!-, the channel strike Y
There is no effect on the output of the -IIA gate between μs1 and GS4. Therefore, even if the line positions of the color 111 film or the photographing lens are made close to each other in the manufacturing process, color mixing will not occur.

Conventionally, when attaching a filter to a COD etc. using post-applied steel, the thickness of this adhesive steel layer must be kept below 10 degrees, otherwise there would be a gap between the filter and the COD, and the layer at the - position would be removed. The problem of having to use a large aperture lens and causing p-stoke is one problem.According to Keimei's comments, Talost-Yu does not occur, so it is possible to use an L-type photographic lens, and Bonding of filter and anti-image tag due to non-uniformity of tensile force during hardening of steel deposit 1
You can ignore this even for the difference +4 + 2 #6 Also, Phil! It has been confirmed that the pasting accuracy of -, which was previously expected to be 0.5 to 1 or less, can now be achieved up to, for example, 3 to 4 m range. Therefore, mass productivity is improved, and walking distance is improved.
In addition, a structure is obtained in which one color and no balance shift occurs.0@m7Illustrated exampleJl1 example uses a common color for all the boundaries of each filter of the color separation filter, and has nine colors.

In this way, the shift of the filter can be offset not only in the horizontal direction but also in the fK direct force direction.

It should be noted that these constructions are also effective in a case where the filter is formed of m*m* layered concrete 1 instead of using post-coated steel. In addition, in this case, a color filter is placed in place of the 1 light section on the Y, which further improves mass production, so the aperture ratio improves and #Ift can be increased.In addition, the channel stop sensitivity ft%- Also, since it is a color film IG filter on the channel strada, the G component that occupies 10% of the total filter I-
111 has increased and the resolution is good for non-electronics.Also, as mentioned above, it is also included in the color F4 quality. )gcGD temetememo MO
There is no problem even if it is S type 0

[Brief explanation of the drawing]

#! 1tWU conventional 8. G, Structure of ay method stripe filter -, Fig. 2(a), (klJ #
i 1st non-defective filter folding self-contained figure, wisteria 6 figure (at, (Koji is color filter spectroscopy custom f: convergent figure, genus 4 figure is unexploded @ Kj Yomachi China Jllll original image A diagram showing an example of the configuration of 5th section (a) to (gl is a diagram showing the failure of the filter #I of the main failure, Figure 6 is a diagram showing other contamination of the filter of the butterfly failure) , wJZ diagram shows other examples of OLS ■... light shielding s, Fa... 9-edge filter FIII...# filter, r
ay... 11 cyan filter feeders now Yanon Co., Ltd. t″? Daishiman Marushima Gi-゛(t E, L brown 2nd eye (Q) 2nd garden (b) jN2=j catty B
fc = +0.
7Ml-IZ funeral, -11

Claims (1)

[Claims] (1) In an imaging device in which a plurality of pure color filters are arranged in front of a predetermined pixel, an imaging device characterized in that filters of the same color are arranged on the boundary in a predetermined direction of the ldj element or on the M plane in the vicinity thereof. . ('2J has a pixel that forms a pure color signal and a pixel that forms a complementary color signal, and obtains a predetermined color signal by performing correlation processing on the pure color signal and the complementary color signal. In addition to arranging two pure color filters to form the complementary color on the light incident surface of the pixel to be formed,
An imaging device characterized in that pure color filters of the same color are arranged near at least one pair of opposing ends of the pixels.