JP3918152B2 - Light source device and image reading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light source device and an image reading device, and more particularly to a light source device and an image reading device using a light emitting element as a light source.
[0002]
[Prior art]
Illumination light is applied to a reflective original such as a photo print or a transparent original such as a photographic film, and the reflected or transmitted light from the original carrying the image information recorded on the original is read by an image such as a CCD (Charge Coupled Device). An image recorded on a document is read by receiving light with a sensor, and various corrections and the like are performed on the image data obtained by the reading, and then image recording and display on a recording material such as photographic paper 2. Description of the Related Art Image reading apparatuses that perform image display and the like have been put into practical use. Such an image reading apparatus has an advantage that it is easy to automate operations from reading an image recorded on a document to recording an image on a recording material and displaying an image on a display.
[0003]
In this type of image reading apparatus, a white light source such as a halogen lamp has been conventionally used as a light source for illuminating a document. However, in recent years, red (R), green (G), blue ( B) An apparatus using an LED light source configured by arranging a large number of LED (light emitting diode) elements that emit colors in various colors on a substrate has been put into practical use. By applying the LED light source, a filter for separating the color of the white light source becomes unnecessary, and the apparatus configuration can be simplified. In addition, setting of conditions such as color balance can be simplified.
[0004]
By the way, when the film surface has scratches or the like, the light irradiated to the film surface is scattered by the scratches, and the image reading sensor cannot obtain the correct detected light amount according to the image information. There is a problem that an image missing portion appears on the image.
[0005]
In order to reduce the effect on the image (hereinafter collectively referred to as “defects”) caused by such scratches on the film surface or dust existing on the optical path from the light source to the film, the color wavelength (visible light) Read the image with invisible light that does not respond to image information (wavelength of region), for example, infrared (IR: InfraRed) to detect only the light scattering portion due to the defective portion, and detect the image missing portion due to the detected defective portion around the defective portion There has also been proposed a technique for digital (electrical) image processing and correction based on the image information.
[0006]
[Problems to be solved by the invention]
However, although electrical image correction using invisible light enables correction with higher accuracy than optical scratch removal, when a light emitting element is used as a light source, it is a light emitting element that mainly emits visible light. In some cases, invisible light is included in the irradiated light. FIG. 8 shows an example in which an LED (light emitting diode) that emits red light, for example, is used as the light emitting element. According to this, visible light and non-visible light are emitted from the LED, but there is a large difference in light emission energy (see FIG. 8A). However, when these lights pass through the film, the light emission energy of visible light (red) becomes small, and the light emission energy (sub-light emission energy) of invisible light becomes conspicuous (see FIG. 8B). For this reason, the detection accuracy of the light-scattering part by a defective part falls, and there exists a fault that the quality of the read image falls, such as a brightness | luminance reducing. Note that, in the case of high-concentration light, the sub-emission energy becomes more conspicuous.
[0007]
In addition, when there is a change in the environmental temperature in the arrangement environment of the light emitting element or a temperature change due to heat generation of the light emitting element itself, the emission spectrum of the light emitted from the light emitting element changes, so images read before and after the temperature change There is a drawback in that the data changes, the color and brightness of the read image become unstable, and the image quality deteriorates.
[0008]
In view of the above-described facts, an object of the present invention is to provide a light source device and an image reading device that can accurately erase a document and do not deteriorate the quality of a read image.
[0009]
[Means for Solving the Problems]
  The light source device according to claim 1 includes a first light source unit that emits first light for reading image information of an image recorded on a transmission original or a reflection original, and a defective portion on the original or an optical path. A light source device including a second light source unit that emits second light for detection,The first light emitting element group and the second light emitting element group are mounted on the same substrate and provided on the irradiation side of the first light source unit.Cuts light having the same wavelength as the second light contained in the first lightA blocking portion and a transmission portion that is provided on the irradiation side of the second light source unit and transmits light having a wavelength equivalent to at least the second light.It is characterized by having a filter.
[0010]
  The light source device according to claim 1 includes a first light source unit that emits light for reading or reflecting image information by transmitting or reflecting an image of a document, and light capable of detecting scratches on the document or dust on an optical path. And a second light source unit that emits light. As the first light for reading the image information by transmitting or reflecting the image of the document, light in a visible light region corresponding to a predetermined color wavelength is used for reading the image. In addition, light in an invisible light region is used as second light for detecting scratches, dust, and the like. For example, when a light emitting diode (LED) is used as the first light source unit, the light source has a wavelength equivalent to that of light emitted from the second light source unit capable of detecting scratches and dust together with light for reading an image. The light it has is emitted. When the sub-emission energy of the light is large, when the image is read by the image reading device using the light source device of the present invention, the image quality is deteriorated, for example, the luminance of the read image is lowered. Therefore, by cutting light having a wavelength equivalent to that of the light from the second light source included in the light from the first light source unit, deterioration in image quality due to the sub-emission energy is prevented.
  The first light emitting element group and the second light emitting element group are mounted on the same substrate, and the filter is provided on the irradiation side of the first light source unit and is included in the first light. A blocking portion that cuts light having a wavelength equivalent to the second light, and a transmission portion that is provided on the irradiation side of the second light source unit and transmits light having a wavelength equivalent to at least the second light. And consist of Thus, since the first light emitting element group and the second light emitting element group are mounted on the same substrate, the number of substrates is not increased.
[0011]
  The light source device according to claim 2 is the light source device according to claim 1, wherein the first light source unit is different based on wavelengths of red (R), green (G), and blue (B) colors. A first light-emitting element group including a plurality of light-emitting elements that emit light of a wavelength, and the second light source unit is a second light-emitting element group including a plurality of light-emitting elements that emit infrared (IR) light. It is characterized by.
[0012]
  According to the light source device of the second aspect, since the first light source unit and the second light source unit are composed of the plurality of light emitting element groups, the heat generation amount is relatively small, and the light emission efficiency of the light source is increased. Can be made. Further, it is possible to emit light by controlling the light emission of each light emitting element and switching each color, or alternately switching the first light source or the second light source.
[0013]
  A light source device according to a third aspect is the light source device according to the second aspect, wherein the filter is provided in the vicinity of a light emitting surface of the first light emitting element group.
[0014]
  According to the light source device of claim 3, when the filter is disposed away from the light emitting surface of the first light emitting element group, the light that can detect dust or the like contained in the light from the first light emitting element group. Since some of the light having the same wavelength as that may not pass through the filter, when the image is read by an image reading device using this light source device, the brightness of the read image decreases. May lead to quality degradation. Therefore, a filter is provided in the vicinity of the light emitting surface of the first light emitting element group. As a result, light having the same wavelength as the light capable of detecting dust or the like out of the light from the first light emitting element can be efficiently cut, and only light capable of image reading can be led to the image. A reduction in image quality can be prevented.
The light source device according to claim 4 is the light source device according to claim 2 or claim 3, wherein the filter emits light having wavelengths of red (R), green (G), and blue (B). It transmits light and reflects light in the infrared wavelength region.
According to the light source device of claim 4, the filter transmits light having wavelengths of red (R), green (G), and blue (B), which is light in the visible wavelength range, and is invisible. Since light in the infrared wavelength range, which is the wavelength range of light, is reflected, light in the visible light range can be used efficiently, and infrared light is used as light for detecting defective portions on the document or the optical path. Light in the wavelength range can be used efficiently.
[0021]
  Claim 5The light source device described inClaims 1 to 4In the light source device according to any one of the above, based on the temperature detection means for detecting the temperature of the part of the substrate where the first light emitting element group is mounted, and the temperature detected by the temperature detection means And a temperature adjusting means for adjusting the temperature of the portion of the substrate where the first light emitting element group is mounted.
[0022]
  Claim 5In the light source device described in (4), if the temperature of the light emitting element is changed, the quality of the image read by the image reading apparatus using the light source device is deteriorated. Therefore, the temperature of the light emitting element is maintained at a predetermined temperature. It is desirable. Therefore, the temperature of the part where the first light emitting element group is mounted is detected by the temperature detecting means. By periodically detecting the temperature, it is possible to detect a temperature change at a site where the first light emitting element group is mounted. Then, based on the detected temperature, for example, when the detected temperature is not a predetermined temperature, the temperature adjusting means radiates or overheats the portion where the first light emitting element is mounted. The temperature is adjusted so as to be maintained at a predetermined temperature. As a result, the temperature of the first light emitting element is kept constant, and deterioration of the image quality of the read image due to the temperature change of the first light emitting element can be prevented. Further, in the case where the first light emitting element group and the second light emitting element group are provided on separate substrates, by providing the temperature adjusting means only on the substrate on which the first light emitting element group is mounted, Cost can be reduced. Note that an electric heater, a fan, a Peltier element, or the like can be used as the temperature adjusting means.
[0023]
  Claim 6The image reading apparatus according to claim 1, wherein the image reading apparatus reads an image recorded on a transparent original or a reflective original.Claim 5The light source device according to claim 1, and image reading means that receives reflected light or transmitted light of light emitted from the light source device and reads image information of the image of the document. It is said.
[0024]
  Claim 6According to the image reading device described in claim 1, the image reading unit includesClaim 5The reflected or transmitted light from the original of the light emitted from the light source device described in any one of the above is received and the image of the original is read. In this image reading apparatus, since the light source device capable of cutting light for detecting dust and the like contained in the light for image reading described above is used as the light source device, the first light source (first light emission) Image quality of the read image due to the fact that the light from the second light source (second light emitting element group) includes light having the same wavelength as the light from the second light source (second light emitting element group). Image reading can be performed. Note that the image reading means includes all photoelectric conversion elements in addition to a CCD such as a line CCD sensor and an area CCD sensor.
[0025]
In the present invention, a visible light source that emits light in a visible light region for reading image information of a document, and a non-visible light that emits light in a non-visible light region for detecting scratches on the document and dust on the optical path. A diffusing member is provided that has a light source and that makes the amount of light applied to the document surface substantially uniform on the optical paths of both light sources. Further, the image processing unit corrects the image information read with the visible light source light based on the image defect portion detection information due to the scratches on the document or the dust on the optical path obtained by reading the image with the invisible light source light.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0035]
[First Embodiment]
1 and 2 show a schematic configuration of a digital laboratory system 10 according to the first embodiment of the present invention.
[0036]
As shown in FIG. 1, the digital lab system 10 includes a CCD scanner 14, an image processing unit 16, a laser printer unit 18, and a processor unit 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.
[0037]
The CCD scanner 14 is for reading frame images 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 magnetic layer are provided. The formed photographic film (240-size photographic film: so-called “APS film”), 120-size and 220-size (Brownie-size) photographic films can be read. The CCD scanner 14 reads the frame image to be read by the CCD sensor 30, A / D-converts it by the A / D converter 32, and then outputs the image data to the image processing unit 16.
[0038]
The image processing unit 16 receives the image data (scanned image data) output from the CCD scanner 14, and also scans image data obtained by photographing with the digital camera 34 or the like, an original (for example, a reflective original), etc. Image data obtained by reading (flood bed type), image data generated by another computer and stored in the floppy disk drive 38, MO drive or CD drive 40, and communication image received via the modem 42 Data and the like can be input from the outside.
[0039]
The image processing unit 16 stores the input image data in the image memory 44, and various corrections such as the color gradation processing unit 46, the hypertone processing unit 48, the hyper sharpness processing unit 50, and the like will be described later depending on settings. Image processing such as film flaw elimination correction using image data read with infrared rays is performed and output 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 the outside as an image file (for example, outputs it to a recording medium such as FD, MO, CD, etc., or transmits it to another information processing device via a communication line Etc.).
[0040]
The laser printer unit 18 includes R, G, and B laser light sources 52, and controls the laser driver 54 to record image data input from the image processing unit 16 (temporarily stored in the image memory 56). The photographic paper is irradiated with a laser beam modulated in accordance with the above, and an image is recorded on the photographic paper 62 by scanning exposure (in this embodiment, an optical system mainly using the polygon mirror 58 and the fθ lens 60). The processor unit 20 performs color development, bleach-fixing, washing with water, and drying on the photographic paper 62 on which an image is recorded by scanning exposure with the laser printer unit 18. As a result, an image is formed on the photographic paper 62.
[0041]
(Configuration of CCD scanner)
Next, the configuration of the CCD scanner 14 will be described. In the present embodiment, the digital lab system 10 in the case where a 135 size photographic film 22 is applied will be described.
[0042]
FIG. 3 shows a schematic configuration of the optical system of the CCD scanner 14. The optical system includes a plurality of LED chips 64R, 64G, and 64B that emit light in respective colors of red (R), green (G), and blue (B) as light sources for irradiating the photographic film 22 with visible light, As a light source for irradiating invisible light for detecting a defective portion, a substrate 65 on which an LED chip group 64A including an LED chip 64IR for irradiating infrared rays is mounted is provided.
[0043]
In this LED chip group 64A, LED chips 64B, 64R, 64G, and 64IR are planar along the transport direction (longitudinal direction) and the width direction of the photographic film 22 to be transported (B, R, G, (IR order) and arranged in high density. This LED chip is controlled to emit light by switching in units of each color, and as a result, the LED chip group 64A is irradiated with R, G, and B light with very little unevenness in the amount of light between the colors. Become so.
[0044]
The LED chips 64R, 64G, and 64B may be arranged in the order of R, G, in units of lines formed linearly along the conveyance direction or width direction of the photographic film 22 for each color in addition to the above. , B can be repeated, and other forms can be applied.
[0045]
The LED chip group 64A is arranged below the photographic film 22 conveyance path in the drawing so that the irradiation direction faces the irradiation surface of the photographic film 22, and the LED chips 64R, 64G, and 64B are located near the light emitting surface. A filter 72 that cuts infrared rays that are invisible light emitted from the LED chip 64 and transmits infrared rays emitted from the LED chip 64IR is disposed.
[0046]
Here, as shown in FIG. 4, the filter 72 is formed of a plate-like body that is substantially the same size and conductive shape as the substrate 65, and is provided on the light emitting surface of the LED chip group 64 </ b> A (FIGS. 4A to 4D). C)). The part of the filter 72 facing the LEDs 64R, 64G, and 64B is formed of an IR cut filter 72A that blocks (cuts) the infrared rays emitted from the LED chips 64R, 64G, and 64B (see FIG. 4C). ). Further, the portion of the filter 72 that faces the LED 64IR is configured by an IR transmission filter 72B that transmits infrared rays irradiated from the LED chip 64IR (see FIG. 4C).
[0047]
Above the filter 72, a mirror box 75 is disposed on the optical path of the light emitted from the LED chip group 64A. In the mirror box 75, the divergence of the light transmitted through the filter 72 and emitted is suppressed.
[0048]
Light from the LED chip group 64 </ b> A passes through the mirror box 75 and is guided toward the photographic film 22. As a result, when the LED chips 64R, 64G, and 64B emit light in RGB colors, the RGB light passes through the IR cut filter 72A of the filter 72 and also through the mirror box 75 and is irradiated onto the photographic film 22. The
[0049]
Irradiation light from the LED chip 64IR passes through the IR transmission filter 72B of the filter 72, follows the same optical path as the RGB illumination light, and passes through the mirror box 75 to the photographic film 22.
[0050]
On the other hand, on the opposite side of the light source portion sandwiching the photographic film 22 positioned and conveyed by the film carrier 74, a spherical surface (or aspherical surface) that forms light transmitted through the frame image along the optical axis of the LED chip group 64A. ) Lens unit 77 and CCD sensor 30 are arranged in this order.
[0051]
Although only one lens is shown in the figure, this lens unit 77 is a zoom lens composed of a plurality of lenses, and serves to form an image of light transmitted through the photographic film 22 at a predetermined position. The CCD sensor 30 is arranged at this predetermined position.
[0052]
The CCD sensor 30 is an 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 conveying direction, and light received by each pixel. And has a function of accumulating as electric charges.
[0053]
As a result, the R, G, and B transmitted light or infrared rays that have passed through the frame image of the photographic film 22 are imaged by the lens unit 77 in almost the entire pixel range of the CCD sensor 30 for each frame image. Read.
[0054]
Thus, in the CCD scanner 14, the infrared rays irradiated from the LED chips 64R, 64G, and 64B are blocked by the IR cut filter 72A, and the infrared rays from the LED chips 64R, 64G, and 64B do not reach the photographic film 22. On the other hand, the infrared rays from the LED chip 64IR pass through the IR transmission filter 72B and reach the photographic film 22. For this reason, in image reading with illumination light, unevenness in the amount of light on the film surface is suppressed, and since infrared rays are not irradiated, the quality of the read image does not deteriorate. On the other hand, when detecting a defective portion, infrared rays are not blocked by the filter 72, and a light scattering portion due to scratches or the like can be accurately detected.
[0055]
The operation of the present embodiment will be described below.
[0056]
When the operator inserts the photographic film 22 into the negative carrier 74 (film carrier) and instructs the frame image reading start using the keyboard 16K of the image processing unit 16, the negative carrier 74 starts conveying the photographic film 22. By this conveyance, so-called pre-scan for preliminarily reading the frame image is executed. That is, while conveying the photographic film 22 at a relatively high speed, the CCD scanner 14 reads not only the 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.
[0057]
Next, based on the result of pre-scanning of each frame image, image reading is performed again, that is, reading conditions for so-called fine scanning are set for each frame image. When the reading condition setting at the time of fine scanning for all the frame images is completed, the photographic film 22 is conveyed in the direction opposite to the pre-scanning, and the fine scanning of each frame image is executed.
[0058]
At this time, since the photographic film 22 is conveyed in a direction opposite to that during pre-scanning, fine scanning is sequentially performed from the last frame to the first frame. Further, the fine scan has a lower conveyance speed than the pre-scan, and the reading resolution is increased accordingly.
[0059]
In addition, when pre-scanning, it recognizes the state of the image (for example, the captured image aspect ratio, under, normal, over, super over, etc.) Can do.
[0060]
Further, during this fine scan, a scratch erasing operation is performed.
[0061]
In other words, the R, G, and B colors are irradiated to the photographic film 22 through the mirror box 75 with the divergence of the light amount suppressed, and after passing through the film, the lens unit 77 forms an image on the CCD sensor 30. Are read for each frame image. Thereafter, the LED chip 64IR emits light, infrared rays are irradiated, scratches on the film surface, dust on the optical path, and the like are read by the CCD sensor 30, and an image read with each color light of R, G, and B is read. Image correction is performed by the image processing unit 16.
[0062]
As described above, in the present embodiment, the LED chip group 64A is an array of a plurality of LED chips 64R, 64G, and 64B that emit light of R, G, and B colors and an LED chip 64IR that emits infrared light. In addition, the filter 72 is disposed close to the filter 72. Further, since the LED chip group 64A is controlled to emit light by switching in units of colors, the LED chips 64R, 64G, and 64B can emit light when reading an image. At this time, the portion of the filter 72 that faces the LED chips 64R, 64G, and 64B is composed of the IR cut filter 72A that blocks infrared rays, and therefore the illumination light that is emitted and emitted from the LED chips 64R, 64G, and 64B. Among them, infrared rays (invisible light) are blocked by the IR cut filter 72A, do not enter the mirror box 75, and do not irradiate the photographic film 22. Therefore, only the R, G, and B irradiation light can be used effectively, and the image quality does not deteriorate, such as a decrease in luminance of the read image.
[0063]
On the other hand, when a defect is detected, the LED chip 64IR can emit light. At this time, since the portion of the filter 72 that faces the LED chip 64IR is configured by an IR transmission filter 72B that transmits IR, the infrared rays that are emitted from the LED chip 64IR are transmitted through the IR transmission filter 72B and the mirror box 75. The photographic film 22 is irradiated via Therefore, the defective part of a film surface can be detected with high accuracy.
[0064]
The present invention is not limited to the CCD scanner using the area-type CCD sensor 30 as in the present embodiment, and can be applied to a line CCD scanner that reads an image while conveying a film using a line-type CCD sensor.
[0065]
As shown in FIG. 5, the filter 72 may be an IR transmission filter 72B based on the arrangement row of the LED chips 64IR. Specifically, the substrate 65 has a plurality of LED chips 64R, 64G, and 64B that emit light of red (R), green (G), and blue (B), and LEDs that emit infrared (IR) light. An LED chip group 64A in which the chips 64IR are arranged in a row is mounted (see FIG. 5B). And the filter 72 is provided in the light emission surface of LED chip group 64A, and this filter 72 is comprised with the substantially same magnitude | size and conductive shape plate-like body as the board | substrate 65 (FIG. 5 (A)-(C). reference). The part of the filter 72 facing the row of LED chips 64R, 64G, 64B is formed by an IR cut filter 72A that cuts off (cuts) the infrared rays emitted from these LED chips 64R, 64G, 64B. The portion of the filter 72 that faces the LED 64IR array is configured by an IR transmission filter 72B that transmits infrared rays emitted from the LED chip 64IR (see FIG. 5C).
[0066]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the 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 is omitted.
[0067]
FIG. 6 is a side view showing a schematic configuration of the light source unit of the CCD scanner 14. In FIG. 6, the mirror box is omitted for simplification. The light source unit includes a plurality of LED chip groups 641 including a plurality of LED chips 64R, 64G, and 64B that emit light of R, G, and B colors mounted on the substrate 65A, and a plurality of infrared light components that are mounted on the substrate 65B. LED chip group 642 which consists of LED chip 64IR.
[0068]
In the LED chip group 641, the LED chips 64R, 64G, and 64B are planar (B, R, and G in LED chip units) along the conveyance direction (longitudinal direction) and the width direction of the photographic film (not shown) to be conveyed. In order) and arranged in high density. The LED chips 64R, 64G, and 64B are controlled to emit light by switching in units of each color. As a result, the LED chip group 641 has R, G, and B light intensity irregularities that are extremely small. Each light comes to be irradiated.
[0069]
The LED chips 64R, 64G, and 64B may be arranged in the order of R, G, in units of lines formed linearly along the conveyance direction or width direction of the photographic film 22 for each color in addition to the above. , B can be repeated, and other forms can be applied.
[0070]
The LED chip group 641 is disposed below the photographic film transport path in the drawing so that the irradiation direction faces the irradiation surface of the photographic film 22, and the LED chip group is disposed in the optical path from the LED chip group 641 to the photographic film. A filter 72 is provided inclined at an angle of about 45 degrees with respect to the optical path of the irradiation light from 641 (arrow Y in FIG. 6).
[0071]
Here, the filter 72 is an IR cut filter and is a rectangular plate, and has a property of transmitting light of each color of R, G, and B and reflecting infrared rays.
[0072]
Accordingly, the irradiation light from the LED chip group 641 passes through the filter 72 and reaches the photographic film through a mirror box (not shown) (see arrow Y in FIG. 6).
[0073]
In addition, an LED chip group 642 composed of an LED chip 64IR that emits infrared light is disposed on the upper right side of the LED chip group 641 in the drawing. The LED chip group 642 is configured by arranging LED chips 64IR in a high density in a row in a direction perpendicular to the transport direction (longitudinal direction) and the width direction of a photographic film (not shown) to be transported. Yes.
[0074]
The light emitted from the LED chip group 642 is reflected by a filter 72 positioned at an inclination of about 45 degrees in the irradiation direction, and coincides with the optical axis from the LED chip group 641 transmitted through the filter 72, and is not shown in the mirror box. Is guided in the direction of the photographic film (see arrow X in FIG. 6).
[0075]
As a result, when the LED chip group 641 emits light in RGB colors, each of these lights passes through the filter 72 and is irradiated onto the photographic film 22 through the mirror box 75. Infrared light from the LED chip group 642 is reflected by the filter 72, then follows the same optical path as the illumination light, and passes through the mirror box 75 to the photographic film 22.
[0076]
A temperature adjusting means 80 such as a Peltier element is provided on the surface of the substrate 65A opposite to the mounting surface of the LED chip group 641. The temperature adjustment means is configured to maintain the temperature of the mounting portion of the LED chip group 641 at a predetermined temperature based on the temperature periodically detected by temperature detection means such as a thermistor.
[0077]
As described above, in the CCD scanner 14 according to the second embodiment, when light of each color of R, G, and B is irradiated from the LED chip group 641, these lights pass through the filter 72, and R , G, and B, light having a wavelength equivalent to that of infrared rays is reflected by the filter 72. For this reason, light having a wavelength equivalent to that of infrared rays does not reach the photographic film, and only light of each color of R, G, and B reaches the photographic film. Therefore, there is no deterioration in image quality due to the sub-emission energy from the LED chip group 641 when reading an image. On the other hand, the infrared rays from the LED chip group 642 are reflected by the filter 72, and the light paths of the respective colors from the LED chip group 641 and the optical path are made the same to reach the photographic film. Thereby, the scattered part of the light by a crack etc. can be detected correctly.
[0078]
Further, as shown in FIG. 7, the present invention can be applied to a so-called integrating sphere 90. On the inner surface of the integrating sphere 90, LED chips 64R, 64G, and 64B that emit R, G, and B colors and 64IR that emits infrared light are mounted. These LED chips 64R, 64G, 64B, and 64IR are respectively switched and controlled to emit light. In addition, an IR cut filter 72 that cuts infrared rays and transmits R, G, and B colors is provided on the light emitting surfaces of the LED chips 64R, 64G, and 64B.
[0079]
When the LED chips 64R, 64G, and 64B emit light, the light of each color from the LED chips 64R, 64G, and 64B passes through the IR cut filter 72, reflects the inner surface of the integrating sphere 90, and The light is emitted from the light emission port 92. At this time, infrared rays emitted from the LED chips 64R, 64G, and 64B together with light of each color are cut by the IR cut filter and are not emitted from the light emission port 92. Therefore, when the LED chips 64R, 64G, and 64B emit light, infrared rays are not emitted from the light emission port 92, and the image quality deteriorates due to the sub-light emission energy of the LED chips 64R, 64G, and 64B when image reading is performed. Never do.
[0080]
On the other hand, the infrared rays from the LED chip 64IR are reflected from the inner surface of the integrating sphere 90 and shielded from the light exit 92. Accordingly, it is possible to accurately detect image scratches, dust, and the like.
[0081]
The present invention has been described for a transparent original such as a photographic film, but it can also be applied to image reading of a reflective original.
[0082]
Further, the invisible light for reading a scratch or the like on the document is not limited to infrared rays, but can be applied to an optical system using ultraviolet rays.
[0083]
In the above-described embodiment, the case where an LED that emits light in the infrared wavelength range (infrared rays) is used and an LED that emits infrared rays is described. However, the present invention is not limited to this. That is, the present invention can be applied to a light source composed only of LEDs having main energy in the wavelength range of visible light. For example, a light source is composed of other LEDs without using an LED that emits only infrared light as a light source, and the other light sources have a wavelength range of visible light such as red (R), green (G), and blue (B). The present invention can be applied when an LED capable of emitting light is used.
[0084]
FIG. 9 shows a light source capable of irradiating the photographic film 22 with visible light. The light source includes a substrate 65 on which an LED chip group composed of a plurality of LED chips 64R, 64G, and 64B that emit light in red (R), green (G), and blue (B) colors is mounted. ing. This LED chip group can be arranged below the photographic film 22 conveyance path in the drawing so that the irradiation direction faces the irradiation surface of the photographic film 22, and LED chips 64R and 64G are located in the vicinity of the light emitting surface. , 64B is provided with a filter 72 that cuts off infrared rays, which are invisible light emitted from 64B.
[0085]
The filter 72 is formed of a plate-like body having a size substantially the same as that of the substrate 65 and having a conductive shape, and is provided on the light emitting surface of the LED chip group (see FIGS. 9A to 9C). The part of the filter 72 that faces the LEDs 64R, 64G, and 64B is formed by an IR cut filter 72A that blocks (cuts) infrared rays emitted from the LED chips 64R, 64G, and 64B (see FIG. 9C). ). That is, the filter 72 is configured to uniformly block (cut) infrared rays emitted from each LED (see FIG. 9C).
[0086]
Accordingly, each light from the LED chips 64R, 64G, and 64B includes an infrared ray that is invisible, but this infrared ray is blocked (cut) by the IR cut filter 72. That is, the infrared light emitted from the LED chips 64R, 64G, and 64B together with the light of each color is not cut and emitted by the IR cut filter. Accordingly, when the LED chips 64R, 64G, and 64B emit light, infrared rays are not emitted, and image quality does not deteriorate due to the sub-light emission energy of the LED chips 64R, 64G, and 64B when performing image reading. .
[0087]
【The invention's effect】
As described above, according to the present invention, an excellent effect is achieved that the original is scratched with high accuracy and the image quality of the read image is not deteriorated.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a digital laboratory 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 showing a schematic configuration of an optical system of the CCD scanner according to the first embodiment of the present invention.
4A is a side view showing an outline of a light source and a filter, and FIG. 4B is a plan view showing an outline of a substrate on which an LED chip group is mounted. FIG. C) is a plan view showing an outline of a filter.
FIG. 5 is an explanatory diagram showing an outline of a light source and a filter according to a second embodiment of the present invention, and FIG. 5 (A) is a side view showing an outline of the light source and the filter, and FIG. ) Is a plan view showing the outline of the substrate on which the LED chip group is mounted, and FIG. 5C is a plan view showing the outline of the filter.
FIG. 6 is a side view showing a schematic configuration of an optical system of a CCD scanner according to a second embodiment of the present invention.
FIG. 7 is a plan view schematically showing an arrangement relationship between LED chip groups and filters according to another embodiment of the present invention.
FIG. 8 is a graph showing a comparison between light emission energy and sub-light emission energy when an LED is used as a light source.
9A is a side view showing an outline of a light source and a filter, FIG. 9B is a plan view showing an outline of a substrate on which LED chip groups are mounted, and FIG. 9C is a view of a filter. It is a top view which shows an outline.
[Explanation of symbols]
10 Digital Lab System
64R, 64G, 64B, 64IR LED chip
64A LED chip group
65 substrates
65A board
65B substrate
72 Filter
72A IR cut filter
72B IR transmission filter
80 Temperature adjustment means
90 integrating sphere
92 Light outlet
641 LED chip group
642 LED chip group

Claims (6)

A first light source that emits first light for reading image information of an image recorded on a transmissive original or a reflective original, and a second light for detecting a defective portion on the original or the optical path A light source device including a second light source unit,
The first light emitting element group and the second light emitting element group are mounted on the same substrate,
A blocking portion that is provided on the irradiation side of the first light source unit and cuts light having the same wavelength as the second light contained in the first light; and on the irradiation side of the second light source unit A light source device comprising: a filter that is provided and includes a transmission portion that transmits at least light having a wavelength equivalent to that of the second light .   The first light source unit is a first light-emitting element group including a plurality of light-emitting elements that emit light of different wavelengths based on wavelengths of red (R), green (G), and blue (B). 2. The light source device according to claim 1, wherein the second light source unit is a second light emitting element group including a plurality of light emitting elements that emit infrared rays (IR).   The light source device according to claim 2, wherein the filter is provided in the vicinity of a light emitting surface of the first light emitting element group. 3. The blocking portion of the filter transmits light of the red (R), green (G), and blue (B) colors and reflects light in the infrared wavelength region. Or the light source device of Claim 3. Temperature detecting means for detecting the temperature of the portion of the substrate on which the first light emitting element group is mounted;
Temperature adjusting means for adjusting the temperature of the portion of the substrate on which the first light emitting element group is mounted based on the temperature detected by the temperature detecting means;
The light source device according to any one of claims 1 to 3, further comprising: An image reading apparatus for reading an image recorded on a transparent original or a reflective original,
The light source device according to any one of claims 1 to 5,
Image reading means for receiving reflected light or transmitted light of the light emitted from the light source device and reading image information of the image of the document;
An image reading apparatus comprising:

Images