JP2000349967A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently utilize luminous light from a light source by allowing an image forming lens to gather more light quantities and to reduce installation space of optical components, even when a plurality of light sources are in use. SOLUTION: In the image reader condenser lenses 69R, 69G, 69B are closely placed to light emitting faces of LED chip groups 64R, 64G, 64B and condenser lens section 71R, 71G, 71B of a light guide main body 71 provided with a dichotic mirror 73 (half mirrors 73A, 73B), making an optical axis of each emitted light coincident are placed respectively opposite to each condenser lens. Thus, the light within the range of a prescribed diffusion in divergent lights emitted from the LED chip groups 64R, 64G, 64B is collected by each condenser lens, and the light guide main body and more light are led up near the face of a photographic film 22, and a large amount of light is gathered in a lens unit 76.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus for obtaining image data by reading transmitted light or reflected light from a frame image while transporting a document on which a plurality of frame images are recorded.

[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 image processing such as enlargement / reduction and various corrections is performed on the read digital image data. There is known a technique of executing an image and forming an image on a recording material by a laser beam modulated based on the image-processed digital image data.

In the technique of digitally reading a frame image using such a reading sensor such as a CCD or the like, in order to realize accurate image reading, the frame image is preliminarily read by so-called "pre-scanning". A reading condition (for example, a light amount applied to a frame image, a charge accumulation time of a CCD, and the like) according to the density and the like of the frame image is determined, and the frame image is read again based on the determined reading condition. Thus, a two-step reading process is performed.

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 is used. However, since this halogen lamp generates a large amount of heat when emitting light, its luminous efficiency is poor and 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, a line CCD in which filters are attached so as to be sensitive to each of the three primary colors) An image reading system has a short wavelength (blue (B) system in terms of color) due to low color temperature. ) Is reduced, and the S
/ N is degraded, which hinders high-speed reading.

For this reason, it has been proposed to use an LED as a light source when a system for reading an image is a CCD. Since LEDs usually emit light of specific colors (blue: B, green: G, red: R), a white light source is configured by arranging these LEDs in a group. In addition, LEDs generate a small amount of heat and have a high color temperature, and thus are suitable as light sources for image reading systems using CCDs.

On the other hand, a color filter is attached to the line CCD on the reading side for each line, and each line CCD detects the density (light amount) of each color. The image reading system is also provided with an imaging lens for imaging light emitted from a light source and transmitted through a negative film on a line CCD.

[0008]

However, the size of the aperture of the above-mentioned imaging lens is limited in order to secure the resolution when reading the image of the line CCD. Therefore, the light transmitted through the negative film and guided to the imaging lens is restricted to a range corresponding to the size of the opening. That is, only light having a limited angle can be taken into the imaging lens. The reduction in the amount of light by the imaging lens leads to a decrease in efficiency in using the light from the light source.

In a case where a plurality of light sources are provided, that is, in a configuration in which a negative film is irradiated with light emitted from each LED provided for each of R, G, and B colors, the number of installed LEDs increases. The installation space for optical components and the like arranged to guide the light of each LED to the negative film is also increased, and there is a problem that the device becomes large.

In consideration of the above facts, the present invention efficiently utilizes the light emitted from the light source by introducing a larger amount of light into the imaging lens, and furthermore, even when a plurality of light sources are used, the optical system component An object of the present invention is to provide an image reading apparatus that can reduce an installation space.

[0011]

An image reading apparatus according to claim 1, wherein the image reading apparatus reads an image by a predetermined color wavelength while conveying a document on which the image is recorded, A plurality of light emitting element groups that are formed in a line in a direction perpendicular to the document conveying direction and emit light at different wavelengths based on the color wavelength, and respective light incident surfaces are arranged close to the plurality of light emitting element groups. A condensing function of guiding light in a range of a predetermined degree of diffusion among divergent lights having different wavelengths emitted from the plurality of light emitting element groups to near the document surface; and different optical axes of the light. A light guide member having a deflection function of deflecting the light guide member so as to be coincident with each other, and transmitting light or reflected light from the document irradiated by the light whose optical axis emitted from the emission surface of the light guide member coincides. Receives light A photoelectric conversion element for converting is characterized by having, an imaging lens for imaging the transmitted or reflected light from the document the photoelectric conversion element.

That is, in the present invention, divergent light having different wavelengths emitted from each light-emitting element group is provided by the light-condensing function of the light-guiding member whose respective incident surfaces are arranged close to the plurality of light-emitting element groups. Are guided to the vicinity of the document surface. Further, each light is deflected by a deflection function provided in the light guide member so that different optical axes are coincident with each other.

The document is illuminated with light having the same optical axis emitted from the light exit surface of the light guide member, and transmitted light or reflected light from the document is imaged on the photoelectric conversion element by the imaging lens. In this photoelectric conversion element, the image of the document is read by photoelectrically converting the received light from the imaging lens.

As described above, since the divergent light emitted from the plurality of light emitting element groups can be guided more to the vicinity of the document surface, the divergent light emitted from each light emitting element group can be used efficiently. . In addition, with this, even in an apparatus in which a plurality of light sources are provided, for example, a light source for each of R, G, and B colors, light from each light source is deflected to make different optical axes coincide with each other. Since the light guide member is provided with the deflecting function, the installation space for these optical components and the like is reduced as compared with a configuration in which members and the like having the deflecting function are individually arranged. Therefore, even if there are multiple light sources,
The size of the apparatus is not increased by the optical system components and the like.

According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, at least one of the light incident surface and the light outgoing surface includes the plurality of light guide members. The divergent light emitted from the light emitting element group is an aspheric lens having a light refracting surface shape having a power of condensing light in the sub-scanning direction of the document.

According to the second aspect of the present invention, since each of the light incident surface or the light exit surface of the light guide member is an aspheric lens having a light refracting surface shape having a power for condensing light in the sub-scanning direction of the document, divergent light is emitted. Are focused in the sub-scanning direction, and the light is guided to the imaging lens with directivity. Therefore,
More light reaches the photoelectric conversion element via the imaging lens, and the amount of light received by the photoelectric conversion element increases.

According to a third aspect of the present invention, in the image reading apparatus according to the second aspect, the lens surface shape of the aspherical lens has a larger curvature as the distance from the optical axis of the lens surface increases. .

That is, according to the third aspect of the present invention, the lens surface at the entrance surface or the exit surface of the light guide member is an aspheric lens whose curvature increases as the distance from the optical axis increases. Therefore, more light radiating from the light source located on the optical axis can be condensed more, and condensing efficiency can be improved.

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 light guide member is provided between the plurality of light emitting element groups and the document. The light guide path is divided into a plurality of parts, and the condensing power for the divergent light is dispersed to the aspherical lens on the entrance surface or the exit surface of each of the plurality of light guide members.

That is, in the invention of claim 4, since each light guide member is divided into a plurality of light guide members, each light guide member is divided into a plurality of light guide members as compared with the case where a light guide path from the light emitting element group to the document is formed by a single continuous light guide member. The light guide member can be reduced in size.

Also, since the condensing power for condensing the divergent light in the sub-scanning direction of the document is dispersed in the shape of the lens on the entrance surface or the exit surface of each light guide member, the entrance surface of a single light guide member is provided. Alternatively, the curvature of the aspherical lens of each lens shape can be reduced as compared with the case where the light exiting surface is provided with the condensing power.

Therefore, the lens shape of each light guide member can be easily processed, and the size of the light guide member can be reduced, so that the manufacturing cost can be reduced.

Further, the light-collecting efficiency can be improved by dispersing the light-collecting power, and more light can be taken into the imaging lens.

[0024]

1 and 2 show a schematic configuration of a digital laboratory system 10 according to an embodiment of the present invention.

As shown in FIG. 1, the digital lab system 10 includes a line CCD scanner 14, an image processing unit 1
6, a laser printer unit 18, and a processor unit 20. Here, the line CCD scanner 1
4 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.

The line CCD scanner 14 is for reading a frame image recorded on a photographic film such as a negative film or a reversal film. For example, a 135 size photographic film, a 110 size photographic film, and a transparent film are used. It is possible to read a frame image of a photographic film on which a magnetic layer is formed (240-size photographic film: so-called “APS film”), and 120- and 220-size (Brownie size) photographic films. The line CCD scanner 14 reads the above-mentioned frame image to be read by the three-line CCD 30 and performs A / D
After the A / D conversion in the converter 32, the image data is output to the image processing unit 16.

The image processing section 16 stores image data (scanned image data) output from the line CCD scanner 14.
Is input, 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.
Image processing such as various corrections and the like, and outputs the 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, outputs the image data to a recording medium such as an FD, an MO, a CD, or to another information processing device via a communication line). Transmission, etc.).

The laser printer unit 18 includes 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 configuration of the line CCD scanner 14 will be described.

In the present embodiment, a digital lab system 10 in which a 135-size photographic film 22 is used will be described.

FIG. 3 shows a schematic configuration of an optical system of the line CCD scanner 14. This optical system includes an LED chip 64 in which a plurality of LED chips that emit red (R), green (G), and blue (B) light, respectively, and includes a light source 66 that irradiates the photographic film 22 with light. (Hereinafter, LED chip groups 64R, 64G, 64B
It will be described as. ).

The LED chips 64 are assembled for each color,
And 1 along the width direction of the photographic film 22 being conveyed.
They are arranged in rows (or in two or more rows). In addition, on the light emitting surface side of each LED chip group 64R, 64G, 64B, a condenser lens (cylindrical lens) 69R,
69G, 69B are arranged close to each other, and a light guide member main body 71 having condensing lens portions 71R, 71G, 71B opposed to the condensing lenses 69R, 69G, 69B at a predetermined interval is installed. . This light guide member body 7
1 is arranged such that the light exit surface 71C approaches the photographic film 22 side.

The condenser lenses 69R, 69G, and 69B are L
The side facing the ED chip groups 64R, 64G, 64B is a flat surface (incident surfaces 69RA, 69GA, 69BA), and the condenser lens portions 71R, 71G, 71B of the light guide member main body 71.
An aspheric lens (emission surface 69RB, 69GB, 69BB) having a condensing power in the sub-scanning direction is formed on the side opposite to.

Thus, the LED chip groups 64R, 64R
G, 64B, out of the divergent light emitted substantially radially, the respective incident surfaces 6 of the condenser lenses 69R, 69G, 69B.
Light incident on the 9RA, 69GA, and 69BA and having a predetermined diffusion degree is output from the respective emission surfaces 69RB, 69GB, and 6BA.
The light is refracted and condensed in the sub-scanning direction by 9BB (aspherical lens). The condenser lenses 69R, 69G, 69
The curvature of the emission surfaces 69RB, 69GB, and 69BB in B increases as the distance from the optical axis increases, and the incident light from the LED chip groups 64R, 64G, and 64B is set to be substantially parallel in the sub-scanning direction. ing.

On the other hand, the light guide member main body 71 has one side (LED
The condenser lens portion 71 is provided on the chip groups 64R and 64B side).
R and 71B protrude, and a condenser lens portion 71G is provided on the lower surface (the surface on the LED chip group 64G side), and the condenser lens portions are integrated. An aspherical lens (a light incident surface 71) having a light condensing power in the sub-scanning direction is provided on a front end surface (a surface facing the light converging lenses 69R, 69G, and 69B) of each of the light converging lens portions 71R, 71G, and 71B.
RA, 71GA, 71BA) are formed.

The light guide member main body 71 is mounted on the photographic film 22 from the LED chip group 64G (condensing lens portion 71G) side.
It has a substantially fan shape whose width (in the direction of the arrow W in the figure) increases toward the side, and an aspheric lens (outgoing surface 71) having a condensing power in the main scanning direction is provided on an end surface facing the photographic film 22.
C) is formed.

Further, in the light guide member main body 71, two sets of half mirrors 73A and 73B having a function of transmitting or reflecting by a polarization plane of light are embedded in an optical path to the photographic film 22 of the LED chip group 64G. The dichroic mirror 73 is constituted by the half mirrors 73A and 73B. Therefore, the dichroic mirror 73 is arranged along the optical axis of the LED chip group 64G.

Here, the emitted light from the LED chip group 64G is guided through the mirror surfaces of the half mirrors 73A and 73B toward the photographic film 22.

The LED chip group 64B has a half mirror 73 whose emitted light is closer to the LED chip group 64G.
The light is reflected by the mirror surface of A and coincides with the optical axis of the LED chip 64G. This light is reflected in the direction of the photographic film 22, and the half mirror 7 on the side close to the photographic film 22.
The light passes through the 3B mirror surface.

Further, the LED chip group 64R reflects the emitted light on the mirror surface of the half mirror 73B, and
It coincides with the optical axis of the D chip 64G.

Thus, the condenser lenses 69R, 69G,
The light is emitted from the emission surfaces 69RB, 69GB, and 69BB of the 69B, and the light-collecting lens portions 71R and 71 of the light guide member main body 71.
G and 71B respectively enter the incident surface 71RA,
The light is refracted again in the sub-scanning direction by 71GA, 71BA (aspherical lens), and becomes light in which each color (R, G, B) is synthesized by half mirrors 73A, 73B.
C is emitted in the direction of the photographic film 22.

The curvature of the entrance surfaces 71RA, GA, and BA of the light guide member main body 71 is such that the width of the light irradiated on the photographic film 22 in the sub-scanning direction is converged to a predetermined width. Is set. The curvature of the exit surface 71C in the main scanning direction is set so that the main scanning direction of the light irradiated onto the photographic film 22 is condensed and the predetermined range of the width dimension of the photographic film 22 is irradiated.

As described above, the LED chip groups 64R, 64R
G, 64B, out of the respective divergent lights, the light in the range of the predetermined diffusion degree is collected by the condenser lenses 69R, 69G,
69B and the photographic film 2 by the light guide member body 71
While being converged in the sub-scanning direction and the main scanning direction while being guided to the vicinity of 2, the light is guided with directivity, and each color is synthesized and irradiated onto the photographic film 22.

On the other hand, on the opposite side of the light source 66 across the photographic film 22 positioned and transported by the negative carrier 74, the light transmitted through the frame image along the optical axis of each of the LED chip groups 64R, 64G, 64B. Spherical (or aspheric) lens unit 76 for forming an image, 3-line CCD 30
Are arranged in order.

The lens unit 76 is a zoom lens composed of a plurality of lenses, and has a function of forming light (combined light) from the LED chip groups 64R, 64G, and 64B at a predetermined position. At this predetermined position, a three-line CCD 30 is arranged.

In the three-line CCD 30, a plurality of pixels for detecting light are arranged along the width direction of the photographic film 22, and three lines are provided in the film transport direction. Each line of pixels has three primary colors (R, G, B)
(Not shown) for each color are provided for each color.
Light reception for each of G and B colors is enabled.

This allows the light to pass through the photographic film 22,
The light imaged on the three-line CCD 30 by the lens unit 76 is accumulated (one-dimensionally) by the three-line CCD 30 as a charge according to the light sequentially received from one end pixel to the other end pixel of each column, Combined with the photographic film 22 being transported, the frame image (two-dimensional) is
It is electrically read for each of the colors G and B.

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 conveying the photographic film 22 at a relatively high speed, the line CCD scanner 14 reads not only image frames but also various data outside the image recording area of the photographic film 22. The read image 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, a pixel missing portion peculiar to the panorama size (both ends in the width direction of the photographic film) is shielded.

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 the 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 sequentially performed 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.
Also, at the time of pre-scanning, since the image state (for example, the photographed image aspect ratio, the photographing state such as under, normal, over, super over, and the presence or absence of strobe photographing) is recognized, it is necessary to read the image under appropriate reading conditions. Can be.

Here, the line CC in the present embodiment
The light source 66 applied to the D scanner 14 is not a halogen lamp or a xenon lamp, which has been widely used in the past, but is an L light source.
ED chip groups 64R, 64G, and 64B are applied.
The LED chip groups 64 </ b> R, 64 </ b> G, 64 </ b> B are arranged almost linearly at high density along the width direction of the photographic film 22, and this straight line faces the reading line of the three-line CCD 30.

The LED chip groups 64R, 64G, 64
The divergent light emitted from B is transmitted to the LED chip groups 64R and 64R.
4G, condenser lens 69R arranged close to 64B,
69G, 69B and condenser lenses 69R, 69G, 69B
Condensing lens portions 71R, 71 of the light guide member main body 71 disposed so as to face the exit surfaces 69RB, 69GB, 69BB side of
By G and 71B, light in a predetermined diffusion degree range of the divergent light is condensed in the sub-scanning direction, and the light is guided with directivity to near the photographic film 22 surface.
At the same time, the respective lights emitted from the LED chip groups 64R, 64G, 64B are combined by the half mirrors 73A, 73B, emitted from the emission surface 71C of the light guide member main body 71, and irradiated onto the photographic film 22.

Further, the transmitted light from the photographic film 22 is imaged on the three-line CCD 30 by the lens unit 76. The three-line CCD 30 photoelectrically converts the received light from the lens unit 76,
The image of the photographic film 22 is read.

As described above, the condenser lenses 69R, 69G,
69B, each incident surface 69RA, 69GA, 69B
A is arranged close to the LED chip groups 64R, 64G, 64B, so that the LED chip groups 64R, 64R
Among the divergent light emitted from G and 64B, light having a predetermined degree of diffusion enters the incident surfaces 69RA, 69GA, and 69BA, and more divergent light is guided to near the photographic film 22 surface. . Therefore, the LED chip group 64
The divergent light emitted from R, 64G, and 64B is used efficiently.

Further, the light guide member main body 71 having the half mirrors 73A and 73B is provided with the condenser lens portions 71R, 71G and 7B.
1B, the half mirror 73
The installation space for these optical system components and the like is reduced as compared with a configuration in which A, 73B and the condenser lens units 71R, 71G, 71B are individually arranged. Therefore, in this embodiment in which a plurality of LED chip groups (light sources) are provided, the size of the device is not increased by these optical components.

Further, the condenser lenses 69R, 69G, 69
The light exit surfaces 69RB, 69GB, 69BB of B and the light incident surfaces 71RA, 71GA, 71BA of the condenser lenses 71R, 71G, 71B of the light guide member main body 71 are respectively emitted from the LED chip groups 64R, 64G, 64B. The divergent light is converted to an aspheric lens having a condensing power in the sub-scanning direction of the photographic film 22, so that the LED chip groups 64R,
The divergent light emitted from 4G and 64B is converged by refraction in the sub-scanning direction, and the light is irradiated onto the photographic film 22 with directivity.

The output surfaces 69RB, 69GB, 69B
The lens surface shape in B is an aspheric lens whose curvature increases as the distance from the optical axis increases, so that the refractive index outside the lens surface is high, and the LED chip groups 64R, 64G, 64B
More divergent light radially emitted from the light can be collected, and the light collection efficiency is improved. Therefore, more light can be taken into the lens unit 76.

In this embodiment, two light-collecting lenses (light-collecting lens 6) are provided in each light guide path from the LED chip groups 64R, 64G, and 64B to the photographic film 22.
9R, 69G, 69B, 70, and condenser lens section 71
R, 71G, 71B). Thus, L
Compared to a case where a single condenser lens is disposed in each light guide path from the ED chip groups 64R, 64G, 64B to the photographic film 22 to form each light guide path, the material for forming the condenser lens is smaller. The number can be reduced, and each condenser lens can be reduced in size.

Further, the condenser lenses 69R, 69G, 69
B outgoing surfaces 69RB, 69GB, 69BB and condensing lens portions 71R, 71G, 71B, incident surfaces 71RA, GA,
In this embodiment, BA is an aspheric lens having a light condensing power in the sub-scanning direction of the photographic film 22. Each divergent light emitted from the LED chip groups 64R, 64G, and 64B is condensed in the sub-scanning direction. Power for the laser beam is distributed to the exit surface and the entrance surface. This allows
The curvature of the aspheric surface of the lens surface on the exit surface and the entrance surface is smaller than when a single condenser lens has the same condenser power. Furthermore, the output surface 71C of the light guide member main body 71 is formed as an aspheric lens having a condensing power in the main scanning direction, so that the divergent light is condensed in the sub-scanning direction. The light condensing function is also provided.

As described above, the light condensing power in the sub-scanning and main scanning directions is dispersed over a plurality of surfaces (lenses), and the light condensing function in the sub-scanning and main scanning directions is provided independently on each surface. This makes it easy to process each lens shape. At the same time, along with the downsizing of the condenser lens as described above,
The manufacturing cost of the condenser lens can be reduced.

In this embodiment, the condenser lens 69
Outgoing surfaces 69RB, 69GB, 69 of R, 69G, 69B
BB and condenser lens portions 71R, 71 of light guide member main body 71
Although the incidence surfaces 71RA, GA, and BA of G and 71B are formed in a lens shape having a condensing power in the sub-scanning direction, the arrangement of these lens shapes is not limited to this embodiment. For example, the emission surface 71 of the light guide member main body 71
Various combinations such as applying a lens shape for condensing light in the sub-scanning direction are also possible for C, and in this case, the light condensing efficiency can be further improved by dispersing the light condensing power.

In this embodiment, the LED chip group 6
Two condensing lenses are arranged in each light guide path from 4R, 64G, 64B to the photographic film 22. However, the number of condenser lenses is not limited to this, and three or more condenser lenses can be provided. As a result, in addition to the above-described effects in reducing the size of the condenser lens and improving the condenser efficiency, the position and arrangement of the condenser lens are adjusted according to the distance of the light guide path and the structure of the line CCD scanner. Design flexibility, such as changing the number, also increases.

Further, in the present embodiment, the photographic film 2
Although the target is a transmission film as in No. 2, the present invention is also applicable to reading a reflection original.

As a lens unit for image formation,
Although the spherical (or aspheric) lens unit 76 is applied, a self-fox lens may be applied.

[0069]

Since the image reading apparatus of the present invention has the above-described configuration, a larger amount of light is taken into the imaging lens, so that the light emitted from the light source can be efficiently used. Also, the installation space for the optical system components can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view showing a schematic configuration of an optical system of the line CCD scanner.

FIG. 4 is a plan view showing a schematic configuration of an optical system of the line CCD scanner.

FIG. 5 is a side view showing a schematic configuration of an optical system of the line CCD scanner.

[Explanation of symbols]

Reference Signs List 10 digital laboratory system 14 line CCD scanner (image reading device) 22 photographic film (document) 30 3-line CCD (photoelectric conversion element) 64B, 64G, 64R LED chip group (light emitting element group) 66 light source 69B, 69G, 69R Lens (light guide member) 69BA, 69GA, 69RA Incident surface 69BB, 69GB, 69RB Exit surface (aspheric lens) 71 Light guide member main body (light guide member) 71B, 71G, 71R Condenser lens portion (condenser function) 71BA , 71GA, 71RA Incident surface (aspheric lens) 71C Exit surface 73 Dichroic mirror (deflection function) 73A, 73B Half mirror (deflection function) 76 Lens unit (imaging lens)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 1/12 Z F term (Reference) 5B047 AA05 AB04 BA01 BB03 BC05 BC09 BC12 5C051 AA01 BA03 DA02 DB01 DB22 DB24 DB29 DB31 DC02 DC04 DC05 DC07 EA01 FA04 5C072 AA01 BA05 CA05 CA07 CA09 DA02 DA06 DA21 EA05 FA07 QA10 VA03 WA01 XA10

Claims (4)

[Claims] While conveying a document on which an image is recorded,
An image reading device that reads the image for each predetermined color wavelength, a plurality of light emitting elements that are formed in a line shape in a direction orthogonal to a document conveyance direction and emit light at different wavelengths based on the color wavelength. A plurality of light-emitting element groups, each light-entering surface being disposed in close proximity to the plurality of light-emitting element groups, and light of a predetermined diffusion degree within divergent light having different wavelengths emitted from the plurality of light-emitting element groups. A light-conducting member having a light-condensing function for guiding the light to a position close to the document surface, and a deflecting function for deflecting the different optical axes of the light so as to be coincident with each other; A photoelectric conversion element that receives transmitted light or reflected light from the document irradiated by the matched light and performs photoelectric conversion, and forms an image of the transmitted light or reflected light from the document on the photoelectric conversion element. Imaging An image reading device comprising: a lens. 2. The light guide member according to claim 1, wherein at least one of the light incident surface and the light exit surface collects divergent light emitted from the plurality of light emitting element groups in a sub-scanning direction of the document. 2. The image reading device according to claim 1, wherein the image reading device is an aspheric lens having a light refracting surface shape having light power. 3. The image reading apparatus according to claim 2, wherein the curvature of the lens surface of the aspherical lens increases as the distance from the optical axis of the lens surface increases. 4. The light guide member is provided by being divided into a plurality of light guide paths in respective light guide paths from the plurality of light emitting element groups to the document, and reduces a light condensing power for the divergent light by the plurality of light guides. The image reading device according to claim 1, wherein the image reading device is dispersed in an aspheric lens on each of an entrance surface and an exit surface of the member.