JP2001045225A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image reader capable of improving the light emission efficiency of respective light sources in the case of deflecting respective illumination light components from plural light sources capable of emitting light by mutually different wavelengths and making the light axes of these light components coincide with each other. SOLUTION: A CCD scanner 14 is provided with plural LED chip groups 64R, 64G, 64B for irradiating a light source part with red(R) light, green(G) light and blue(B) light and a dichroic mirror 73 for irradiating a photographing film 22 with respective color light components by deflecting these color light components and making their optical axes coincide with each other. Respective LED chip groups 64R, 64G, 64B are arranged so that the transmission frequency of B light, G light and R light through half mirrors 73A to 73C is successively reduced, so that the transmission factor of B light through the film 22 is low and the light loss of B light due to the dichroic mirror 73 is suppressed and the light emission efficiency of the whole light sources can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus which obtains image data by reading transmitted light or reflected light from a frame image recorded on a document.

[0002]

2. Description of the Related Art In recent years, a frame image recorded on an original such as a photographic film is photoelectrically read by a reading sensor such as a CCD, and digital image data obtained by the reading is subjected to enlargement / reduction and various corrections. 2. Description of the Related Art There is known a technique of executing image processing and forming an image on a recording material by a laser beam modulated based on image-processed digital image data.

In the technique of digitally reading a frame image using such a reading sensor such as a CCD, a frame image is preliminarily read (so-called “pre-scan”) in order to realize accurate image reading. Reading conditions (for example, the amount of light applied to the frame image and the charge storage time of the CCD) according to the image density and the like are determined, and the frame image is read again based on the determined reading conditions (so-called “fine scan”). ).

In the above-described image reading system, as a light source, a halogen lamp, which has been frequently used for printing exposure and the like, has been used. However, this halogen lamp generates a large amount of heat at the time of light emission, and thus has a high luminous efficiency. However, there is a problem that the increase in reading speed is limited.

That is, a halogen lamp is most suitable as a light source for printing through a negative film and directly printing on photographic paper as in printing exposure.
(Usually, in a system that reads an image with a line CCD in which filters are attached so as to be sensitive to each of the three primary colors, the amount of light of a short wavelength (blue in terms of color) because of the low color temperature) Is low and the S / N of the read image is deteriorated, which hinders high-speed reading.

Further, a lamp having a high color temperature (for example, a xenon lamp or a metal halide lamp) has a problem that the image quality cannot be read well due to discharge noise.

For this reason, it has been proposed to apply an LED as a light source when a system for reading an image is a CCD. LEDs have a low calorific value and a high color temperature.
It is suitable as a light source for an image reading system using a CD.

[0008] Here, the LED usually has a specific color (red:
R, green: G, and blue: B), so that an RGB light source can be configured by arranging them collectively for each color (R, G, B) to form an LED chip group.
Furthermore, RG emitted from each LED chip group
A configuration has also been proposed in which the B light is deflected by a deflecting means such as a dichroic mirror so that the optical axis is aligned and irradiated onto the document surface.

In this case, a monochrome area CCD is used as the CCD on the reading side, and each LED is
By switching the chip group to emit light, the density (light amount) of each color is sequentially detected.

On the other hand, in such image reading, there is a problem that the image quality is degraded due to scratches or dirt on the film surface (a change in the amount of light due to the generation of scattered light corresponding to the scratches). In response to this, a technique has been proposed in which a film surface is irradiated with infrared rays (IR) and read to determine a flaw or the like, and the image quality deteriorated portion is digitally processed and corrected (Japanese Patent Application Laid-Open No. Hei 6-1994). No. 28468).

[0011]

However, when an LED is used as a light source as described above, the LED has a lower luminous intensity than a halogen lamp or the like, and therefore depends on the transmittance characteristics (or reflectance characteristics) of the film. There is a problem that the effect cannot be ignored.

That is, since the base of the negative film has the characteristic that the transmittance decreases as the wavelength of the light becomes shorter, the transmittance of each color light decreases in the order of red, green, and blue. Means that the difference in the amount of light transmitted through the film due to the difference in color wavelength becomes remarkable.

Therefore, in order to suppress such color balance deterioration and obtain good image quality, the LED light source emits blue light with the highest emission intensity, and then emits green light and red light in this order.

On the other hand, the dichroic mirror is provided with a plurality of half mirrors for deflecting, for example, light of three primary colors for each wavelength. The half mirror generally has a transmittance (about 85%) and a reflectance (about 85%). (About 95%). For this reason, when the illumination light from each color LED is deflected by a plurality of half mirrors, the light of the color wavelength whose number of times of transmission through the half mirror increases has a smaller light quantity loss than the light of the color wavelength whose number of times of transmission is small. growing.

Therefore, in order to compensate for the loss of light amount due to transmission through the negative film, the LE of a color wavelength having a low film transmittance is used.
Although D is made to emit light intensely, there is a problem that the light amount is still lost by passing through the dichroic mirror, and the loss amount increases as the number of times of transmission increases. It has been desired to improve the luminous efficiency of the light source by improving it.

In view of the above, the present invention deflects each illumination light from a plurality of light sources emitting at different wavelengths,
It is an object of the present invention to provide an image reading apparatus in which the luminous efficiency of a light source is improved when aligning optical axes.

[0017]

According to a first aspect of the present invention, there is provided an image reading apparatus for reading an image recorded on a document by a predetermined color wavelength, wherein the image reading apparatuses differ from each other based on the color wavelength. A plurality of light-emitting element groups that emit light at a wavelength, and a deflecting member that transmits or reflects according to the polarization state of the illumination light so that the optical axes of the illumination light having different wavelengths from the plurality of light-emitting element groups match each other. Deflection means, an imaging optical system for forming an image of light from the deflection means in the vicinity of the document surface, a light receiving element that receives light transmitted or reflected on the document surface, and performs photoelectric conversion,
Wherein the plurality of light emitting element groups are such that the light emitting element group that emits light at a wavelength at which the transmittance or reflectance of the document is low is more deflected than the light emitting element group that emits light at a wavelength at which the transmittance or reflectance is high. It is characterized by being arranged so that the number of times of transmission or reflection of the member is reduced.

That is, in the present invention, light from a plurality of light emitting element groups that emit light at different wavelengths is deflected by a deflecting member provided in a deflecting means, and is irradiated onto a document so that the optical axes coincide with each other. You. Here, the plurality of light emitting element groups, when each light is transmitted or reflected through the document, a light emitting element group that emits light at a wavelength of low transmittance or reflectance of the document,
They are arranged so that the number of times of transmission or reflection through the deflecting member is smaller than that of a light emitting element group that emits light at a wavelength having a high transmittance or reflectance.

For this reason, light having low transmittance or reflectance of the original document has less light loss caused by transmitting or reflecting through the deflecting member than light having high transmittance or reflectance. As a light source composed of, the total amount of emitted light is suppressed. Therefore, the luminous efficiency of the light source is improved.

According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, light of different wavelengths of the plurality of light emitting element groups is blue, green, and red, and the blue and green light Light is transmitted or reflected by the deflecting member less frequently than the red light.

That is, according to the second aspect of the present invention, the plurality of light emitting element groups are constituted by light emitting element groups that emit light in blue, green, and red wavelengths, which are visible light regions. The number of times that the blue and green lights are transmitted or reflected by the deflecting member is smaller than that of the red light.

For this reason, the amount of light loss due to the transmission or reflection of the deflecting member is smaller in blue and green light than in red light, and the blue light and green light are low in transmittance or reflectance of the original. Irradiates the light emission amount of the light emitting element group.

According to a third aspect of the present invention, in the image reading apparatus of the second aspect, the number of times that the blue light is transmitted or reflected by the deflecting member is smaller than that of the green light. And

That is, according to the third aspect of the present invention, blue light having the lowest transmittance or reflectance of the original among the three primary colors is transmitted or reflected by the deflecting member less frequently than green light. Therefore, the number of times each color light is transmitted or reflected by the deflecting member is blue light, green light, and red light in ascending order.

Therefore, the light amount loss of each color due to the deflecting member matches the transmittance characteristic of the document, and the light emitting efficiency of the light source can be further improved. Further, it becomes easy to balance the light quantity of the light emitting element group of each color.

According to a fourth aspect of the present invention, in the image reading apparatus according to any one of the first to third aspects, the plurality of light emitting element groups are provided with scratches on the original surface and dust in the optical path. A light emitting element group that emits light at an infrared wavelength for identifying the light emitting element is added.

That is, according to the fourth aspect of the present invention, a group of light emitting elements which emit light at an infrared wavelength for identifying scratches on the original surface and dust in the optical path emits illumination light for image reading to the original. It is provided in addition to the plurality of light emitting element groups provided. The optical axis of the infrared light is aligned with the optical axis of the illumination light of each light emitting element group by the deflecting means, and the infrared light is applied to the film from the same direction as the illumination light.

Therefore, the light emitting element group for irradiating the infrared light can be easily arranged in the light source constituted by the plurality of light emitting element groups, and the light path of the infrared light is not separately required. Can also.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIGS. 1 and 2 show a digital lab system 1 according to a first embodiment of the present invention.
0 is shown.

As shown in FIG. 1, the digital lab system 10 includes a CCD scanner 14, an image processing section 16, a laser printer section 18, and a processor section 20. Here, the CCD scanner 14 and the image processing unit 16 are integrated as an input unit 26 shown in FIG. 2, and the laser printer unit 18 and the processor unit 20 are integrated as an output unit 28 shown in FIG. ing.

This CCD scanner 14 is for reading a frame image recorded on a photographic film such as a negative film or a reversal film.
Size photographic film, size 110 photographic film,
Further, a photographic film (24) having a transparent magnetic layer formed thereon
0 size photographic film: so-called “APS film”), and frame images of 120 size and 220 size (Brownie size) photographic films can be read. The CCD scanner 14 reads the above-mentioned frame image to be read by the CCD sensor 30 and outputs the read image to the A / D converter 32.
After the A / D conversion in the image processing unit 1
Output to 6.

The image processing section 16 receives image data (scanned image data) output from the CCD scanner 14 and receives image data obtained by photographing with the digital camera 34 or the like, and a document (for example, a reflection document). Data obtained by reading the image data with a scanner 36 (floodbed type), image data generated by another computer and stored in a floppy disk drive 38, an MO drive or a CD drive 40, and received via a modem 42 It is also configured to be able to input communication image data and the like from the outside.

The image processing section 16 stores the input image data in the image memory 44, and stores a color gradation processing section 46, a hypertone processing section 48, and a hyper sharpness processing section 50.
, And image processing such as film damage correction using image data read by infrared rays, and outputs the resulting image data to the laser printer unit 18 as recording image data.
Further, the image processing unit 16 outputs the image data subjected to the image processing to an external device as an image file (for example, FD, M
O, CD, etc., and transmission to other information processing devices via a communication line, etc.).

The laser printer unit 18 has R, G, and B laser light sources 52, and controls a laser driver 54 to record image data (temporarily stored in an image memory 56) input from the image processing unit 16. Is applied to the photographic printing paper, and scanning exposure (in the present embodiment, mainly the polygon mirror 58 and the fθ lens 60) is performed.
An image is recorded on the photographic paper 62 by an optical system using the same. Further, the processor unit 20 includes a laser printer unit 18.
The photographic paper 62 on which an image has been recorded by scanning exposure is subjected to color development, bleach-fix, washing, and drying. Thus, an image is formed on the printing paper 62.

(Configuration of Line CCD Scanner) Next, the CC
The configuration of the D scanner 14 will be described.

In this embodiment, a digital lab system 10 in which a 135-size photographic film 22 (transparent original) is applied will be described.

FIG. 3 shows a schematic configuration of an optical system of the CCD scanner 14. This optical system is red (R),
It comprises an LED chip 64 in which a plurality of LED chips that emit green (G), blue (B), and infrared (IR) light, respectively, and has a light source (not shown) that irradiates the photographic film 22 with light. .

The LED chips 64 are assembled for each color,
And the photographic film 2 conveyed on the aluminum substrate 65
2 are arranged at high density in three substantially linear rows along the width direction. Note that the number of arrangements may be other than three, and can be appropriately changed in relation to the light emission amount and the like. (Hereafter, LED
Description will be given as chip groups 64R, 64G, 64B, and 64IR. ) LED chip groups 64R, 64G, 64B, 64IR
Light emission is controlled so that each is switched to emit light, and condensing lenses (cylindrical lenses) 71R, 71G, 71B, 71IR are arranged on each light emitting surface side, and these condensing lenses 71R, 71G, 71B are provided. , 7
Divergent light is converted into parallel light by 1IR.

Here, the LED chip group 64R is disposed below the photographic film 22 transport path in the drawing such that the irradiation direction faces the irradiation surface of the photographic film 22. This L
A dichroic mirror 73 is provided on the optical path of the ED chip group 64R to the photographic film 22. The dichroic mirror 73 includes three half mirrors 73A,
73B and 73C, and are arranged along the optical axis of the LED chip group 64R. The half mirrors 73A, 73B, and 73C have a function of transmitting or reflecting light depending on the polarization plane of light.

Here, the irradiation light of the LED chip group 64R passes through the mirror surfaces of the half mirrors 73A, 73B and 73C and is guided toward the photographic film 22.

An LED chip group 64IR is disposed at the upper left of the LED chip group 64R in the figure, and the irradiation light of the LED chip group 64IR is reflected on the mirror surface of the half mirror 73A located in the irradiation direction. It coincides with the optical axis of the LED chip group 64R. This light is reflected in the direction of the photographic film 22, and is transmitted through the mirror surfaces of the half mirrors 73B and 73C closer to the photographic film 22.

An LED chip group 64G is arranged above the LED chip group 64IR in the drawing, and the irradiation light of the LED chip group 64G is reflected on the mirror surface of the half mirror 73B, and the LED chip group 64R (and LED Chip group 6
4IR). This light is reflected in the direction of the photographic film 22 and passes through the mirror surface of the half mirror 73C closer to the photographic film 22.

Further, an LED chip group 64B is arranged above the LED chip group 64G in the figure, and the irradiation light of the LED chip group 64B is reflected on the mirror surface of the half mirror 73C to form the LED chip 64R (and the LED chip 64R). Group 64
(IR, 64G), and is irradiated in the direction of the photographic film 22.

Thus, the LED chip groups 64R, 64
When G and 64B emit light and the respective color lights enter each half mirror, the optical axes are aligned by the deflection function of the dichroic mirror 73, and the light is emitted in the same direction (the direction of the photographic film 22).

Further, a condenser lens (cylindrical lens) 75 is provided on the light exit side of the dichroic mirror 73, and the exit light from the dichroic mirror 73 is arranged immediately before the photographic film 22 by the condenser lens 75. The image is formed at the position of the diffuser 77 thus set.

The same applies to the case of infrared rays emitted from the LED chip group 64IR. After being reflected by the half mirror 73A, it follows the same optical path as the illumination light, and
Thus, an image is formed on the diffusion plate 77.

Further, each of these lights is uniformly diffused by the diffusion plate 77 and is irradiated on the photographic film 22 surface. That is, since the light of each color is condensed, and once formed into an image, the light is diffused near the photographic film 22.
LED chip group 64R, 64G, 64B, or LE
Most of the light amount output from the D chip group 64IR can be guided to the photographic film 22 surface.

On the other hand, the LED chip groups 64R, 64G, 64B, 64I are located on the opposite side of the light source section across the photographic film 22 positioned and transported by the negative carrier 74.
Along the optical axis of R, a lens unit 76 for imaging light transmitted through the frame image and a CCD sensor 30 are sequentially arranged.

The lens unit 76 is a zoom lens composed of a plurality of lenses (aspherical surface or spherical surface), and has a function of forming an image of light transmitted through the photographic film 22 at a predetermined position. And the CCD is
A sensor 30 is arranged.

The CCD sensor 30 is a monochrome area type sensor in which a plurality of pixels for detecting light are arranged in a matrix (two-dimensional) along the width of the photographic film 22 and the transport direction. It has a function of accumulating electric charges according to light received by each pixel.

Thus, the transmitted light of each color of R, G, and B or the infrared light transmitted through the frame image of the photographic film 22 is imaged by the lens unit 77 in almost the entire pixel range of the CCD sensor 30 for each frame image. It is read electrically for each color.

The operation of this embodiment will be described below.

The operator inserts the photographic film 22 into the negative carrier 74 (film carrier), and
When the start of frame image reading is instructed by the keyboard 16K of No. 6, the transport of the photographic film 22 is started in the negative carrier 74. By this transport, a pre-scan is performed. That is, while the photographic film 22 is transported at a relatively high speed, the CCD scanner 14 reads not only the frame image but also various data outside the image recording area of the photographic film 22. The scanned image is
It is displayed on the monitor 16M.

At this time, the size of the frame image is recognized. For example, in the case of a panorama size frame image, the pixel missing portions (both ends in the width direction of the photographic film) peculiar to the panorama size are shielded from light.

Next, the reading conditions at the time of fine scanning are set for each frame image based on the prescan result of each frame image, and the reading conditions at the time of fine scanning are set based on the prescan result. It is set every time.

When the setting of the reading conditions at the time of the fine scan for all frame images is completed, the photographic film 22 is set.
Is conveyed in the direction opposite to the prescan, and a fine scan of each frame image is executed.

At this time, since the photographic film 22 is being conveyed in the direction opposite to that in the pre-scan, the fine scan is executed sequentially from the last frame to the first frame.
The transport speed of the fine scan is set lower than that of the pre-scan, and the reading resolution is accordingly increased.
In addition, since the image state (for example, the photographed image aspect ratio, the photographing state such as under, normal, over, and super over, the presence or absence of flash photography, etc.) is recognized at the time of pre-scanning, the image should be read under appropriate reading conditions. Can be.

In the CCD scanner 14 of the present embodiment, at the time of these scans, an image is read with infrared rays by the LED chip group 64IR, and the image processing section 16 identifies scratches on the film surface and dust in the optical path. , The image data is corrected.

Here, the LED chip groups 64R, 64G,
64B and 64IR are switched and emit light, and the divergent light emitted from each LED chip group is condensed by the condenser lens 7 respectively.
After being made parallel by the 1R, 71G, 71B and 71IR, the half mirror 73 of the dichroic mirror 73
A, 73B, and 73C are transmitted or reflected so that their optical axes coincide,
An image is formed on the diffusion plate 77 by the condenser lens 75.

Each of the formed color lights is uniformly diffused by the diffusion plate 77 and is irradiated on the photographic film 22 surface. The light transmitted through the frame image of the photographic film 22 is transmitted to the lens unit 76.
Thus, an image is formed on the CCD sensor 30 and received by the pixels of the CCD, whereby the density (light amount) of each color light of RGB or infrared light is obtained.

As described above, the CCD of the present embodiment
In the scanner 14, LEDs emitting at different wavelengths from each other
The chip group is constituted by LED chip groups 64R, 64G, and 64B that emit light at red, green, and blue wavelengths in the visible light region, and the arrangement of the LED chip groups for each color is as follows.
Red light from LED chip group 64R, LED chip group 6
The number of times of transmission through the half mirrors 73A, 73B and 73C provided in the dichroic mirror 73 in the order of green light from 4G and blue light from the LED chip group 64B is reduced.

That is, the number of times that each light is transmitted and reflected by the half mirror is such that red light is transmitted only three times (half mirrors 73A, 73B, 73C) and green light is transmitted once (half mirror 73C). Once (half mirror 73
B) Blue light reflected only once (half mirror 73C)
Becomes

As a result, the light amount loss due to the dichroic mirror 73 decreases in the order of red light, green light, and blue light, and the light amount balance of each color matches the transmittance characteristics of the photographic film 22. (Group) The total light emission amount is suppressed, and the light emission efficiency is improved.

In the CCD scanner 14 of the present embodiment, the LED chip groups 64R, 64R provided in the light source section for irradiating the film with illumination light for reading an image.
In addition to G and 64B, an LED chip group 64IR for irradiating infrared rays for correcting image quality deterioration due to scratches or the like of the photographic film 22 is provided. The optical axis of the infrared light is aligned with the optical axis of the illumination light by the half mirror 73A, and the infrared light is applied to the photographic film 22 from the same direction as the illumination light.

As described above, the LED chip group 64IR that emits infrared rays is composed of the LED chip groups 64R, 64G, and 64.
The device can be easily arranged in the light source constituted by B, and the size of the device can be reduced because an infrared light path is not separately required.

The light source unit of the present embodiment can be configured by exchanging the arrangement of the LED chip group 64IR and the LED chip group 64R.

[Second Embodiment] Next, a second embodiment of the present invention will be described. In this second embodiment,
Since the configuration is almost the same as that described in the first embodiment, the same components are denoted by the same reference numerals, and the description of the configuration will be omitted. The feature of the second embodiment is that a dichroic mirror as a deflecting means is applied in another form.

FIGS. 5 and 6 show a schematic configuration of an optical system of the CCD scanner 15 according to the second embodiment of the present invention. The optical system includes an LED chip group 64RR mixed with LED chips 64 for switching and irradiating each of red light and infrared light, an LED chip group 64G for irradiating green light, and an LED chip group 64B for irradiating blue light. Have been. (Hereafter, LED chip group 64RR, 6RR
The description will be made as 4G and 64B. ) LED chip group 64R
As in the first embodiment, R is arranged below the photographic film 22 transport path in the drawing such that the irradiation direction faces the irradiation surface of the photographic film 22. A dichroic prism 78 is provided in the optical path of the LED chip group 64RR to the photographic film 22.

The dichroic prism 78 is a half mirror 78 which is orthogonal to each other at the center line in the side direction of the mirror surface.
A, 78B, and are arranged such that the optical axis of the LED chip group 64RR passes through the center in the width direction of the intersection. The half mirrors 78A and 78B
Also has a function of transmitting or reflecting the light depending on the polarization plane.

Here, the irradiation light (red light or infrared light) of the LED chip group 64RR is applied to the half mirrors 78A and 78R.
The light is transmitted through the mirror surface B and guided toward the photographic film 22.

An LED chip group 64G is disposed on the upper right side of the LED chip group 64RR in the drawing, and the irradiation light of the LED chip group 64G is transmitted through the back surface of the half mirror 78B and is transmitted to the mirror surface of the half mirror 78A. Is reflected and LE
The optical axis coincides with the optical axis of the D chip group 64RR.

Further, an LED chip group 64B is disposed on the upper left side of the LED chip group 64RR in the figure, and the irradiation light of the LED chip group 64B is transmitted through the back surface of the half mirror 78A and is transmitted to the mirror surface of the half mirror 78B. Is reflected and L
It is aligned with the optical axis of the ED chip group 64RR.

For this reason, the LED chip groups 64RR, 64RR
G and 64B emit light, respectively, and when each color light is incident on each half mirror, each color light is emitted toward the condenser lens 75 by the deflection function of the dichroic prism 78, and is passed through the condenser lens 75 and the diffusion plate 77. 22.

As described above, also in the present embodiment in which the deflecting means is the dichroic prism 78, the LED chip groups 64G and 64B for irradiating light of a wavelength (blue or green) having a low transmittance to the photographic film 22 are connected to the transmittance. The LED chips 64RR that emit high wavelengths (red or infrared) can be arranged so that the number of transmissions through the half mirrors 78A and 78B is smaller than that of the LED chip group 64RR.

That is, the number of times that each light is transmitted and reflected by the half mirror is such that red light and infrared light are transmitted only twice,
Blue light and green light are transmitted and reflected once each.

Therefore, the dichroic prism 78
The amount of light loss due to the transmission of blue light and green light is smaller than that of red light, and the blue light and green light of which the transmittance of the photographic film 22 is low.
The light emission amount of 64B can be suppressed, and the light emitted from the light source unit can be used effectively.

Further, by using the dichroic prism 78 in which the half mirrors 78A and 78B intersect, the LED chip group of each color can be arranged more compactly, and the optical system of the CCD scanner can be downsized.

Although the present embodiment and the first embodiment have been described with reference to a transparent original such as the photographic film 22, the present invention can also be applied to image reading of a reflective original.

[0080]

Since the image reading apparatus of the present invention has the above-described configuration, it deflects each illumination light from a plurality of light sources that emit light with different wavelengths to make the optical axes coincide, thereby improving the light emission efficiency of the light sources. Let me do.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a digital lab system according to a first embodiment of the present invention.

FIG. 2 is an external view of a digital laboratory system.

FIG. 3 is a perspective view illustrating a schematic configuration of an optical system of the CCD scanner according to the first embodiment of the present invention.

FIG. 4A is an LED according to the first embodiment of the present invention.
FIG. 2B is a side view showing an arrangement state of a reading optical system including a chip group, a dichroic mirror, and a CCD sensor, and FIG. 2B is a plan view of the LED chip group.

FIG. 5 is a perspective view illustrating a schematic configuration of an optical system of a CCD scanner according to a second embodiment of the present invention.

FIG. 6 (A) is an LED according to a second embodiment of the present invention.
FIG. 2B is a side view showing an arrangement state of a reading optical system including a chip group, a dichroic mirror, and a CCD sensor, and FIG. 2B is a plan view of the LED chip group.

[Explanation of symbols]

Reference Signs List 10 digital laboratory system 14 CCD scanner (image reading device) 15 CCD scanner (image reading device) 22 photographic film (document) 30 CCD sensor (photoelectric conversion element) 64R, 64G, 64B, 64IR, 64RR LED
Chip group (light emitting element group) 73 Dichroic mirror (deflecting means) 73A, 73B, 73C Half mirror (deflecting member) 75 Condensing lens (imaging optical system) 78 Dichroic prism (deflecting means) 78A, 78B Half mirror (deflecting member) )

Claims (4)

[Claims] 1. An image reading apparatus for reading an image recorded on a document for each predetermined color wavelength, comprising: a plurality of light emitting element groups that emit light at different wavelengths based on the color wavelength; A deflecting unit having a deflecting member that transmits or reflects the illumination light having a different wavelength from the element group depending on the polarization state of the illuminating light so as to match the optical axes of the illuminating light; An imaging optical system for forming an image in the vicinity, and a photoelectric conversion element that receives light transmitted or reflected on the original surface and performs photoelectric conversion, and the plurality of light emitting element groups transmit the original through the original. The light emitting element group that emits light at a wavelength with a low reflectance or reflectance is arranged such that the number of times that the light is transmitted or reflected through the deflecting member is smaller than the light emitting element group that emits at a wavelength with a high transmittance or reflectance. Image reading apparatus according to claim. 2. The light of different wavelengths of the plurality of light emitting element groups is blue, green, and red, and the number of times that the blue and green light is transmitted or reflected by the deflecting member more than the red light. 2. The image reading apparatus according to claim 1, wherein the number of images is small. 3. The image reading apparatus according to claim 2, wherein the number of times that the blue light transmits or reflects through the deflecting member is smaller than that of the green light. 4. A light emitting element group that emits light at an infrared wavelength for identifying a flaw on the document surface or dust in an optical path, is added to the plurality of light emitting element groups. The image reading device according to claim 3.