JPH06205163A - Color picture reader - Google Patents

Abstract

PURPOSE:To obtain the luminous quantity of each color of a color picture at a high speed with the high S/N and to realize the color reproducibility by providing a prescribed color separate filter onto a light receiving face of each of RGB colors of a CCD sensor. CONSTITUTION:A signal in response to a light receiving quantity of each color in a CCD line sensor 30 for fine scanning is fed to a log transformation section 50 via an amplifier 44, an A/D converter 46 and a CCD correction section 48, in which log transformation is applied to the signal based on an LUT. Then the result from the circuit 50 is fed to a picture processing section 54 via a crosstalk correction circuit 52 to obtain proper density information for each color of a negative film 12 and a proper exposure is calculated in response to the applied type of print paper to a printer 56. Then color resolving filters 42R, 42G, 42B whose transparent valid wavelength band widths Rw, Gw, Bw have a relation of Bw>Gw>Rw are located on light receiving planes 30A-30C of each RGB color of the sensor 30 to take an optimum color balance to the negative film 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a CCD sensor to read a transmission image of a color photographic filter irradiated with white light.
The present invention relates to a color image reading device that reads the amount of light for each color of GB.

[0002]

2. Description of the Related Art When reading the amount of light of each color of a color image recorded on a photographic film (negative film or positive film), a CCD sensor to which a film of each color is attached can be applied.

This CCD sensor is commercially available, and an optimum filter is usually attached to the light receiving surface for a positive document.

Here, when a halogen lamp is used as a light source in the light receiving system (a fluorescent lamp is often used for a positive document), the commercially available CCD sensor is applied for each RGB color of the negative film. When reading the amount of light of B, the light source itself lacks B light, and the B light is further absorbed by the mask of the negative film. Therefore, in order to achieve color balance, it is necessary to reduce the sensitivity of other light (G light, R light) in accordance with the B light whose light amount has decreased. It has been proposed to appropriately select and switch between filters for negative films and positive films (reversal films) according to the dye spectrum (see Japanese Patent Laid-Open No. 4-502396).

[0005]

However, the problem of lack of B light peculiar to a negative film has not been solved so far, and it has been considered difficult to provide a restraint and a high performance scanner for a negative film.

As for the performance for reading a color image, all three factors having a trade-off relationship of short scan time, good color separation, and little deterioration of noise due to crosstalk correction are well-balanced. Although it is preferable to sag, any of the three elements is sacrificed in the above means, and for example, in order to obtain a high speed and a high S / N ratio,
If the color separation filter is set to a wide width, the color separation becomes poor. Therefore, if crosstalk correction is excessively applied in order to improve color separation, there arises a problem that graininess deteriorates.

In consideration of the above facts, the present invention considers high speed, high S /
An object of the present invention is to obtain a color image reading apparatus that can obtain the light amount of each color of a color image with N ratio, can efficiently balance colors, and can achieve excellent color reproducibility and excellent color reproducibility. .

[0008]

According to a first aspect of the present invention, there is provided a color image reading apparatus for reading a light amount of a transmitted image of a color photographic film irradiated with white light for each of RGB colors by a CCD sensor. RGB of CCD sensor
Transmission effective wavelength bandwidth Rw, Gw, B on the light-receiving surface of each color
The color separation filter is characterized in that w is Bw>Gw> Rw.

According to a second aspect of the present invention, the effective transmitted wave is
Long bandwidth B_W, Gw and Rw are half-width Δλ_B, Δ
λ_G, Δλ_RIs equivalent to Δλ_B= 50-140 nm, Δλ_B−
Δλ _G= 30 to 50 nm, Δλ_G-Δλ_R= 10 to 30 nm (however,
λ_R≧ 10 nm) and its peak wavelength λ_BP, Λ_GP, Λ_RP
But each λ_BP= 420 to 480 nm, λ_GP= 520-580nm
 , Λ_RP= 660 to 720 nm and peak sensitivity λ_GPWhen
λ_RPIntermediate wavelength λ with₇G light and R light sensitivity S at_G
(Λ₇), S_R(Λ₇) Is S_G(Λ₇) <0.0
5, S_R(Λ₇) <0.05
There is.

The invention according to claim 3 is characterized in that the transmission effective wavelength bandwidths Gw and Bw of G light and B light are widened with reference to the transmission effective wavelength bandwidth of R light of the CCD sensor. .

The invention according to claim 4 is characterized in that each of the transmission effective wavelength bandwidths Rw, Gw, and Bw is set so that the light amount of the mask transmission density of the photographic film is substantially constant for both RGB. .

According to a fifth aspect of the present invention, the color separation filter is fixed to each light receiving surface of each color of the CCD sensor.

According to a sixth aspect of the present invention, the color separation filter narrows the spectral sensitivity distribution of the R light at the CCD sensor, and the peak wavelength of the spectral sensitivity distribution of the R light is at the color photograph. It is characterized in that it is set to coincide with the absorption peak wavelength of the cyan dye of the negative film in the film.

[0014]

[Function] The light transmitted through the mask of the color photographic film is converted into C
In order to balance the color when light is received by the CD sensor, the condition (1) below must be satisfied.

[0015] _{∫E (λ) F R (λ} ) S (λ) T mask (λ) dλ = ∫E (λ) F G (λ) S (λ) T mask (λ) dλ = ∫E (λ) F _B (λ) S (λ) T _mask (λ) dλ (1) where E (λ) is the spectral energy distribution of the white light source, and for example, the spectral energy distribution of the halogen lamp is shown in FIG. It has the properties shown.

F _j (λ) represents a spectral transmittance curve of each color (j = B, G, R) of the color separation filter applied to the invention described in claim 1, and is shown in FIG. 2 (A). Have the following characteristics. As shown in FIG. 2A, the transmission effective wavelength bandwidths Bw, Gw, and Rw of each curve have a relationship of Bw>Gw> Rw.

S (λ) is the spectral sensitivity distribution of the CCD sensor and has the characteristics shown in FIG. In the case of a commercially available color CCD sensor (three light-receiving surfaces with filters for each color attached), the spectral sensitivity distribution has a peak in each BGR. For example, the spectral sensitivity of a color CCD sensor manufactured by NEC The distribution has the characteristics shown in FIG.

T _mask (λ) represents the spectral transmittance of the mask of the negative film of the color photographic films,
It has the characteristics shown in FIG.

When the above equation (1) is established, the CCD sensor can be used with the highest S / N.

Here, the peak density (c, m, y) of the color photographic film dye and the CCD sensor output (R, G,
If the relationship of B) is expressed by a 3 × 3 matrix,

[0021]

[Equation 1]

At this time, the arithmetic expression for correcting the crosstalk, that is, the portion of each spectral sensitivity distribution that is overlapped and affects is as shown in the following expression (3).

[0023]

[Equation 2]

Here, in the color photographic film and the CCD sensor, the variation (noise) called grain deterioration is generated by performing the crosstalk correction. The noise of color photographic film is Δc, Δm, Δy, CC
Assuming that the noise generated in the D sensor is ΔR, ΔG, and ΔB, the corrected equation (2) becomes the following equation (4).

[0025]

[Equation 3]

According to the first aspect of the invention, the color separation filter has its effective transmission wavelength bandwidths Rw, Gw, and Bw such that Bw>Gw> Rw. Therefore, the color separation filter shown in FIG. It has the following characteristics. Note that, in order to determine the effective transmission wavelength band width of each spectral transmittance characteristic curve F _j (λ), it is generally expressed by a half width λ, and therefore, the half width of each color is Δλ _B > Δλ _G >. If we set Δλ _R ,
A color separation filter having the characteristics shown in FIG. 2A can be constructed.

When a color separation filter having such characteristics is applied, only a _mB among the matrix elements of the non-diagonal terms of the above expressions (2) and (3) becomes large. To simplify the effect of this a _mB (assuming 0 other than a _mB is assumed to be 0), the equation (3) becomes the following equation (5).

Since the B channel is _broadened , a _yB becomes a _yB <1.0 among the diagonal terms. Below, a
by _mB a _yB claim, how much noise, one will be amplified, quantitative analysis.

[0029]

[Equation 4]

Therefore, when this equation (5) is calculated,

[0031]

[Equation 5]

Substituting the above equation (4) into each of the equations (6),

[0033]

[Equation 6]

It becomes The granularity at y ′ is represented by σ _y and is expressed by the following equation (8).

[0035]

[Equation 7]

Here, σ _G : granularity of ΔG (RMS granularity) σ _B : granularity of ΔB (RMS granularity) σ _y : granularity of Δy (RMS granularity)

As described above, by widening the wavelength band of B light, noise of the G channel influenced by a _mB and a _yB is mixed into y '. Also, the noise of the B channel is amplified by a _yB . As a result, granular deterioration occurs only in the y dye.

However, since the granular deterioration of the y dye is difficult to be visually recognized by the human eye, the total granularity of B, G, and R does not deteriorate so much in appearance. Further, the crosstalk correction is very simple because only the third equation of the above equation (6) is required.

As described above, in the invention described in claim 1,
It is possible to balance the color without deteriorating the apparent graininess, reducing the total amount of light more than necessary. Therefore, high-speed processing can be realized and high S /
N can be obtained.

According to the second aspect of the invention, in obtaining the transmission effective wavelength standby widths B _W , Gw and Rw, FIG.
As shown in (B), the optimum values were selected by normalizing the spectral sensitivity of the CCD sensor and the spectral transmittance of the color separation filter to a peak sensitivity of 1.0.

As a result, the effect shown in claim 1 can be obtained within at least the range of the numerical values described in claim 2. The evaluations of the half width, the peak wavelength, and the sensitivity at λ ₇ are as follows.

[Half width] Δλ _B = 70 to 100 nm (preferably 60 to 120 nm, most preferably 50 to 140 nm) Δλ _B −Δλ _G = 30 to 50 nm Δλ _G −Δλ _R = 10 to 30 nm (however, Δλ _R Is 10 nm or more.) [Peak wavelength] λ _BP = 420 to 480 nm (preferably 430 to 470 nm, most preferably 440 to 460 nm) λ _GP = 520 to 580 nm (preferably 530 to 570 nm, most preferably 540 to 560 nm) ) λ _RP = 660 ~720nm (preferably 670 ～710Nm, most preferably 680 ~700nm) [in sensitivity lambda _{7] S G (λ 7) <0.2} ( preferably 0.1, most preferably
0.05) S _R (λ ₇ ) <0.2 (preferably 0.1, most preferably
0.05) According to the invention of claim 3, in order to obtain the relationship of the transmission effective wavelength bandwidth of each color (Bw>Gw> Rw), C
With the R light of the CD sensor as a reference, the effective transmission wavelength bandwidth of B light and G light is widened. Therefore, it is possible to prevent a decrease in energy that has been caused by reducing the outputs of the G light and the R light with the B light as a reference for achieving color balance.

According to the invention described in claim 4, when the effective transmission wavelength band is widened, the problem of crosstalk occurs. That is, since the G light is transmitted by the B light color separation filter, it is necessary to correct that amount. It is considered that the graininess is deteriorated by this crosstalk correction, but as described above, it is the y pigment that increases due to the widening of the bandwidth of the color separation filter of B light. Since it is relatively difficult to visually recognize, it is only necessary to set the bandwidth of the color separation filter of each color in consideration of only the color balance, which facilitates the design and manufacture.

According to the fifth aspect of the present invention, the color separation filter is fixed to the light receiving surface of the commercially available CCD sensor for each color. In this way, the color separation filter should be designed and manufactured by considering only the necessary color of the light emitted from the light source and transmitted through the color photographic film, and the color separation filter should be arranged in any of the optical systems. No space is required and the device can be made compact.

According to the sixth aspect of the invention, the color separation filter has the spectral sensitivity distribution of the R light in the CCD sensor in a narrow band. Color photographic film includes a negative film and a positive film (reversal film), and the sensitivity peak wavelength of the c dye is different between the negative film and the positive film. Therefore, the peak of the spectral sensitivity distribution of R light is present in either one. If the wavelengths are matched, the other will shift.

For the above reasons, it is not necessary to switch the color separation film between the negative film and the positive film by matching the peak of the spectral sensitivity distribution of R light with the peak of the c dye layer of the negative film.

By the way, with respect to the negative film, the high density side corresponds to the highlight on the print, so that the S / N condition is severe. For this reason, it is possible to increase the S / N ratio by matching the peak wavelength of the spectral sensitivity distribution of the R light narrowed by the color separation filter with the spectral absorption peak wavelength of the cyan dye of the negative film.

Further, the negative film and the positive film have different dynamic ranges (γ value of the negative film ≈0.9, γ value of the positive film ≈1.2). That is, as a characteristic of the film, the positive film has a wide dynamic range of the dye image. Therefore, in order to fit within the dynamic range of the CCD sensor, it is preferable to remove the peak from the positive film.

On the other hand, it is also possible to match the spectral sensitivity peak of the R light with the positive film, and in that case, an image quality optimized for the positive film can be obtained.

In this case, with respect to the negative film, the R channel reads the C dye on the short-wave side from the peak position. However, if the R channel is set to a sufficiently narrow band, the magenta dye will give a color turbidity of 4. There is no problem and there is no problem.

[0051]

EXAMPLE FIG. 6 shows a color image reading apparatus 10 according to this example.

The color image reading apparatus 10 is provided with a carrier 16 which holds and conveys a color photographic film (negative film 12 in this embodiment) by a plurality of pairs of rollers 14. The base 16A and the lid 16B of the carrier 16 are connected by a hinge (not shown) and can be opened and closed. The slit hole 1 is formed in the base 16A and the lid 16B.
6C and 16D are provided.

The negative film 1 is driven by driving the roller 14.
2 is conveyed, each image frame 12 of the negative film 12
A is conveyed in order of the slit hole 16C and the slit hole 16D. The distance between the slit holes 16C and 16D is a predetermined distance.

The slit hole 16C located on the upstream side of the negative film 12 in the transport direction is used as a prescan portion. That is, the light source 18 is provided corresponding to the slit hole 16C, and the light emitted from the light source 18 is transmitted through the image frame 12A on the slit hole 16C. A prescan CCD line sensor 22 is arranged on the transmission side through a lens 20. The pre-scan CCD line sensor 22 has a light receiving surface 22.
A has three channels (three lines), receives the transmitted light, and sends an electric signal corresponding to the received light amount to the prescan calculation storage unit 24. The prescan calculation storage unit 24 calculates the density of the negative film 12.

The prescan calculation storage section 24 is connected to each of the input timing control section 26 and the dimming control section 28. The input timing control unit 26 determines the edge of the image frame 12A based on the input density signal, and controls the input timing of the fine scan CCD line sensor 30 of the fine scan unit described later.

Further, the dimming control section 28 judges the type of the negative film 12 based on the inputted density signal, and the dimming filter unit 32 of the fine scanning section, which will be described later.
Control the appearance of the.

The slit hole 16D located on the downstream side of the negative film 12 in the transport direction is used as a fine scan section. That is, the light source 34 is provided corresponding to the slit hole 16D. The light source 34 is optimally one that emits white light such as halogen lamp.

A light control filter unit 32 and a light collecting cavity 36 are arranged between the light source 34 and the carrier 16, and the light emitted from the light source 34 passes through the light control filter unit 32 and the light collecting cavity 36. Then, it reaches the negative film 12 and is transmitted. here,
Since the dimming filter unit 32 is projected and retracted according to the negative film 12 loaded on the carrier 16 by the dimming control unit 28 of the pre-scan unit, during the fine scan, the negative film 12 is moved to the negative film 12 in an optimal dimming state. Can be irradiated.

Further, the light source 34 and the light control filter unit 3
2 and the color balance filter 38 for positive film
Are arranged so that they can appear and disappear. The color balance filter 38 for the positive film is arranged on the optical path only when the photographic film loaded in the carrier 16 is the positive film.

The lens 4 is provided on the transmission side of the slit hole 16D.
CCD line sensor 30 for fine scanning via 0
Is provided.

As shown in FIGS. 7 and 8, in this fine scan CCD line sensor 30, three light receiving surfaces 30A, 30B and 30C capable of receiving light of each color of RGB are provided in a line in parallel with each other. ing. This light receiving surface 3
0A, 30B, and 30C respectively include color separation filters 4
2B, 42G, 42R are attached. The color separation filters 42B, 42G, 42R have a role of limiting the transmission wavelength of each color.

The wider the transmission wavelength width, the larger the amount of received light, and the narrower it is, the smaller the amount of received light.

Here, the color separation filter 42 of the present embodiment.
In B, 42G, and 42R, the transmission effective wavelength bandwidth for receiving light is widest for B light, and narrowed in order of G light and R light.

By the way, a white light source 3 such as a halogen lamp
In No. 4, it is known that the B light of the light source itself is insufficient, and the B light is further absorbed by the mask of the negative film 12. Therefore, the lack of the B light is compensated by widening the effective transmission wavelength band width of the B channel color separation filter 42B.

The color separation filter 42 having such a configuration as described above.
By using B, 42G, and 42R, the received light amount of each line when passing through the mask density of the negative film 12 becomes a constant value.

Further, the color separation filter 42R
The effective transmission bandwidth of light is narrowed, and its peak wavelength is matched with the sensitivity peak wavelength of the negative film 12.

Fine scan CCD line sensor 3
0 is connected to the amplifier 44 and sends out an electric signal according to the amount of received light. The amplifier 44 is an A / D converter 46.
, And then to the log conversion unit 50 via the CCD correction unit 48. In the log conversion unit 50, the digitized and corrected signal is log-converted based on an LUT (look-up table).

Here, the operation timings of the fine scan CCD line sensor 30, the amplifier 44, the A / D converter 46, the CCD correction unit 48, and the log conversion unit 50 are controlled by the input timing control unit 26 of the prescan unit. It is designed to be synchronized based on signals.

The log conversion unit 50 includes the crosstalk correction circuit 5
Image signal (density information for each color)
Is designed to be corrected for crosstalk. That is, it is necessary to correct the overlapping portion of the B channel and the G channel caused by widening the effective transmission wavelength band width of the B channel color separation filter 42B. By this crosstalk correction, for example, the density of the y dye mixed in the G channel is corrected, and proper density information (dye amounts c ′, m ′, y ′) for each color can be obtained.

The crosstalk correction circuit 52 is connected to the image processing section 54. The image processing unit 54 calculates the exposure amount and sends it to the printer 56.
In the printer 56, an image is printed on a photographic printing paper (not shown) based on the input exposure amount using the negative film 12 loaded in the carrier 16.

The operation of this embodiment will be described below. The negative film 12 is loaded on the carrier 16 and is conveyed at a constant speed by driving the roller 14. At this time, the prescan section detects the transmitted light of the negative film 12 being conveyed, and the prescan calculation storage section 24 calculates the density of the negative film 12. The calculated density is sent to the input timing control unit 26. The input timing control unit 26 determines the edge of the image frame 12A on the negative film 12 and controls the detection timing during fine scanning.

Further, the calculation result in the prescan calculation storage section 24 is sent to the dimming control section 28, and the type of the negative film 12 is judged based on the detected density. The dimming control unit 28 arranges the dimming filter unit 32 on the optical path of the fine scan unit according to the determined type of the negative film. This makes it possible to obtain optimum light for the type of the negative film 12 loaded on the carrier 16 during fine scanning.

When the negative film 12 is continuously conveyed and the input timing control unit 26 determines that it is the input timing, the image frame 12A corresponding to the edge detected by the prescan unit is provided with the slit hole on the downstream side. 1
Reach 6D.

At this point, the fine scan CCD line sensor 30 starts receiving light for each color. An electric signal corresponding to the amount of received light is an amplifier 44, an A / D converter 46, a CCD
It is sent to the log conversion unit 50 via the correction unit 48, and the LUT
The log is converted based on. Next, crosstalk correction is performed by the crosstalk correction circuit 52, and appropriate density information (dye amounts c ′, m ′,
y ') is obtained.

This density information is sent to the image processing section 54,
An appropriate exposure amount is calculated according to the type of printing paper applied by the printer 56, and the printer 56 prints an image on the printing paper based on this exposure amount.

As described above, in this embodiment, a commercially available CCD is used.
The color separation filters 42B, 42G, 42R are mounted on the light receiving surfaces 30A, 30B, 30C of the line sensor (fine scan CCD line sensor 30), and the negative film 1
Because I tried to get the optimal color balance for 2,
Compared with color balance by interposing a filter on the optical path, the space for installing the filter is small and the filter can be made compact. Further, by mounting the color separation filters 42B, 42G, and 42R on each of the light receiving surfaces 30A, 30B, and 30C, color separation is better than color separation by interposing filters on the optical path.

Further, since the effective transmission bandwidth of the color separation filter 42B is widened, it is possible to make up for the shortage of the B light absorbed by the mask of the negative film 12 which is insufficient in the light source 34 itself, and the other colors of other colors can be compensated. Color balance can be achieved without reducing the amount of received light. Therefore, the negative film 12
It is possible to increase the transport speed of the.

Since the effective transmission bandwidth of the color separation filter 42B is corrected by the crosstalk correction,
It is possible to obtain an appropriate value for the actual amount of received light (density). In addition, graininess (variation) caused by crosstalk correction
Increase is only for the y dye, and since this y dye is difficult for the human eye to visually recognize, there is no apparent increase in graininess,
A high S / N can be obtained.

Here, in determining the characteristics of the color image reading apparatus 10, there are three elements as shown in FIG.
In the color image reading device 10 of the present embodiment, it can be seen that the three elements are optimized in a well-balanced manner as shown by the solid line in FIG.

For comparison, a case where all the color separation filters have a wide band as shown in FIG. 10 (see a chain line in FIG. 9) and a case where all the color separation filters have a narrow band as shown in FIG. 11 ( This is also shown together with the one-dot chain line in FIG. 9).

The R channel color separation filter 42
N is a narrow band, and this transmission wavelength peak is the negative film 1
Since the sensitivity peak wavelength is set to 2, the S / N ratio of the negative film 12 in which the high density side is a highlight on the print can be improved.

In this embodiment, the negative film 12 was applied as the color photographic film to obtain the effect.
The same effect can be obtained even with a positive film. At this time, the characteristic curves of the positive film and the negative film are different, and the wavelength of the sensitivity peak of the positive film and the transmission by the color separation filter 42R are set by setting the color separation filter 42R of the R channel to a narrow band as in this embodiment. Although the wavelength peak deviates, the deviation of the peak can keep the dynamic range of the positive film within the dynamic range of the fine scan CCD line sensor 30.

[0083]

As described above, the color image reading apparatus according to the present invention can obtain the light amount of each color of the color image at high speed and high S / N ratio, and can efficiently balance the color. It has an excellent effect that excellent color reproduction with good color separation can be realized.

[Brief description of drawings]

FIG. 1 is a spectral energy distribution characteristic diagram of a halogen lamp.

2A is a characteristic diagram showing a spectral transmittance characteristic curve of a color separation filter according to the present invention, and FIG. 2B is a spectral sensitivity of a CCD, a spectral transmittance of a color separation filter, and a peak sensitivity of 1.0. It is the converted characteristic diagram.

FIG. 3 is a spectral sensitivity distribution characteristic diagram of a general CCD line sensor.

FIG. 4 is a spectral sensitivity distribution characteristic diagram of a commercially available (made by NEC) color CCD line sensor.

FIG. 5 is a spectral transmittance characteristic diagram of a negative mask.

FIG. 6 is a schematic configuration diagram of a color image reading apparatus according to the present embodiment.

FIG. 7 is a plan view of a fine scan CCD line sensor.

FIG. 8 is a side view of a CCD line sensor for fine scanning.

FIG. 9 is a triangular coordinate characteristic diagram showing the performance of the three elements of the color image reading device.

FIG. 10 is a characteristic diagram showing a spectral transmittance curve when all color separation filters have a wide band.

FIG. 11 is a characteristic diagram showing a spectral transmittance curve when all color separation filters have a narrow band.

[Explanation of symbols]

 10 Color Image Reading Device 12 Negative Film 34 Light Source 42B, 42G, 42R Color Separation Filter

[Procedure amendment]

[Submission date] January 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

According to a second aspect of the present invention, the effective transmitted wave is
Long bandwidth B_W, Gw and Rw are half-width Δλ_B, Δ
λ_G, Δλ_RIs equivalent to Δλ_B= 50-140 nm, Δλ_B−
Δλ _G= 30 to 50 nm, Δλ_G-Δλ_R= 10 to 30 nm (however,
λ_R≧ 10 nm) and its peak wavelength λ_BP, Λ_GP, Λ_RP
But each λ_BP= 420 to 480 nm, λ_GP= 520-580nm
 , Λ_RP= 660 to 720 nm and peak sensitivity λ_GPWhen
λ_RPIntermediate wavelength λ with₇G light and R light sensitivity S at_G
(Λ₇), S_R(Λ₇) Is S_G(Λ₇) <0.2
, S_R(Λ₇) <0.2Is characterized by
There is.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

[0029]

[Equation 4]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

[Half width] Δλ _B = 50 to 140 nm (preferably 60 to 120 nm, most preferably 70 to 100 nm ) Δλ _B −Δλ _G = 30 to 50 nm Δλ _G −Δλ _R = 10 to 30 nm (however, Δλ _R Is 10 nm or more.) [Peak wavelength] λ _BP = 420 to 480 nm (preferably 430 to 470 nm, most preferably 440 to 460 nm) λ _GP = 520 to 580 nm (preferably 530 to 570 nm, most preferably 540 to 560 nm) ) λ _RP = 660 ~720nm (preferably 670 ～710Nm, most preferably 680 ~700nm) [in sensitivity lambda _{7] S G (λ 7) <0.2} ( preferably 0.1, most preferably
0.05) S _R (λ ₇ ) <0.2 (preferably 0.1, most preferably
0.05) According to the invention of claim 3, in order to obtain the relationship of the transmission effective wavelength bandwidth of each color (Bw>Gw> Rw), C
With the R light of the CD sensor as a reference, the effective transmission wavelength bandwidth of B light and G light is widened. Therefore, it is possible to prevent a decrease in energy that has been caused by reducing the outputs of the G light and the R light with the B light as a reference for achieving color balance.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

In this case, with respect to the negative film, the R channel reads the C dye on the short wave side from the peak position. However, if the R channel is set to a sufficiently narrow band, the magenta dye will not be picked up and the color will not be picked up. It does not cause turbidity and there is no problem.

Claims (6)

[Claims] 1. A color image reading device for reading the amount of light of a transmitted image of a color photographic film irradiated with white light for each of RGB colors by a CCD sensor, wherein transmission is effective on a light receiving surface of each of the RGB colors of the CCD sensor. Wavelength bandwidth Rw
, Gw, Bw are provided with color separation filters such that Bw>Gw> Rw. 2. The effective transmission wavelength bandwidth B _W , G _w , R
w corresponds to half-widths Δλ _B , Δλ _G , and Δλ _R , respectively,
Δλ _B = 50 to 140 nm, Δλ _B −Δλ _G = 30 to 50 nm, Δλ
_G −Δλ _R = 10 to 30 nm (where λ _R ≧ 10 nm), and their peak wavelengths λ _BP , λ _GP , and λ _RP are respectively λ _BP = 420
˜480 nm, λ _GP = 520 to 580 nm, λ _RP = 660 to 720 nm, and sensitivity G G and R light S _G (λ ₇ ), S _{R at} the intermediate wavelength λ ₇ between the peak sensitivity λ _GP and λ _RP. (Λ ₇ )
, S _G (λ ₇ ) <0.05, S _R (λ ₇ ) <0.05, respectively
The color image reading apparatus according to claim 1, wherein 3. The transmission effective wavelength bandwidths Gw and Bw of G light and B light are expanded with reference to the transmission effective wavelength bandwidth of R light of the CCD sensor. The described color image reading device. 4. The transmission effective wavelength bandwidths Rw, Gw, and Bw are set such that the light amount of the mask transmission density of the photographic film is substantially constant in RGB. The color image reading device according to any one of 1. 5. The color image reading device according to claim 1, wherein the color separation filter is fixed on each light receiving surface of each color of the CCD sensor. 6. The CC according to the color separation filter.
The spectral sensitivity distribution of the R light in the D sensor is set to a narrow band, and the peak wavelength of the spectral sensitivity distribution of the R light is set to match the absorption peak wavelength of the cyan dye in the negative film of the color photographic film. The color image reading device according to claim 1, wherein the color image reading device is a color image reading device.