JP3664005B2 - Photographic film image reader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a photographic film image reading apparatus that irradiates a photographic film with visible light and infrared light emitted from a light source, and reads an image of the photographic film with a visible light sensor and an infrared light sensor.
[0002]
[Prior art]
Such a photographic film image reading device is a device that irradiates a photographic film with light emitted from a light source and generally detects the transmitted light by a CCD sensor or the like to read an image photographed on the photographic film.
As described above, the photographic film image reading apparatus originally functions to read an image photographed on the photographic film. However, in recent years, the photographic film image reading apparatus also detects scratches and dust attached to the photographic film as an image, It has been considered to improve the image quality by correcting the read image affected by the scratches and dust by specifying the position where the dust is attached.
[0003]
The detection of the scratches and dust is performed by obtaining an infrared image of a photographic film as described in, for example, JP-A-6-28468 and JP-A-9-163133. In general, visible light is modulated by both the image taken on the photographic film itself and by scratches and dust attached to the photographic film, while infrared light is modulated by scratches and dirt on the photographic film. Although dust is modulated by scattering, it utilizes the phenomenon that it is not affected by the image itself taken on the photographic film.
[0004]
As a configuration for obtaining such an infrared image, Japanese Patent Laid-Open No. 6-28468 discloses that light applied to a photographic film is sequentially switched between visible light and infrared light by a rotary filter, and is visible at different timings. An image and an infrared image are obtained, and Japanese Patent Application Laid-Open No. 9-163133 discloses a structure in which the visible image and the infrared image are detected by a photometric stage provided separately.
In addition, in the above-mentioned conventional example, it is not described about changing the magnification which measures the image of a photographic film.
[0005]
[Problems to be solved by the invention]
However, in actual photographic film image readers, there is a demand for the visible light sensor to be able to read photographic film images at various magnifications in response to the various sizes and print sizes of the photographic film itself. If the reading magnification of the visible light sensor can be changed, the infrared light sensor is linked to the magnification of the lens for imaging the image of the photographic film on the light receiving surface of the infrared light sensor. It will be possible to change.
Such a lens capable of changing the magnification is usually designed so that the focus position is constant regardless of the magnification, but this is performed for visible light, and the inventor of the present invention In this way, when an infrared image is read using a lens optimized for visible light, the variation in focus position due to the change in lens magnification cannot be ignored due to the wavelength dependence of the refractive index. It has been found that so-called defocusing occurs.
[0006]
In this case, a configuration may be considered in which the infrared light sensor is moved in the optical axis direction in accordance with the change in magnification to absorb the fluctuation of the focus position, but the infrared light sensor is moved in the optical axis direction with high accuracy. To drive, the configuration becomes complicated.
The present invention has been made in view of the above circumstances, and an object thereof is to enable a favorable infrared image to be read with a simple configuration even when an infrared image is read with the magnification of the lens being changeable. In the point.
[0007]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, the characteristic configuration of claim 1 of the present invention is a magnification changing lens that can be switched between a first magnification state and a second magnification state that is lower than the first magnification state. A light path branching unit for branching the optical path from the magnification changing lens unit into a visible light optical path and an infrared light optical path, and the position of the visible light sensor is determined by the first magnification and the second magnification. The focus position of the visible image in both magnification states is set to be on the visible light sensor, and the position of the infrared light sensor is the focus position of the infrared image in the first magnification state. Is set to be on the infrared light sensor, and the optical path branching in the optical path for infrared light is changed according to the switching operation of the magnification changing lens unit from the first magnification state to the second magnification state. Means and the infrared light sensor In response to the switching operation from the second magnification state to the first magnification state of the magnification changing lens unit. A focus position changing translucent body configured to retract from the space is provided, and the red light based on the magnification changing lens unit in the second magnification state by the entry of the focus position changing translucent body. The focus position of the outside image is that it is configured to come on the infrared light sensor.
  In order to have such a characteristic configuration, in the photographic film image reading apparatus according to the present invention, the focus that extends the substantial optical path length in accordance with the switching of the magnification changing lens unit to the second magnification, which is a lower magnification. A configuration in which the position changing translucent member enters the infrared light path and the focus position changing translucent member is retracted from the infrared light optical path in accordance with switching to the first magnification which is a high magnification. As a result, a photographic film image reading apparatus in which the focus position of the infrared image is on the infrared light sensor regardless of switching of the magnification of the magnification changing lens unit is realized.
  That is, when the magnification of the lens for forming the image of the photographic film on the light receiving surface of the infrared light sensor is changed, with the change of the magnification, between the lens and the infrared light sensor, A focus position changing translucent body that shifts the focus position in the optical axis direction is moved out and out. By changing the focus position displacement due to the focus position changing translucent to the change in the focus position due to the change in the lens magnification, the lens position can be changed by moving the focus position changing translucent. Since the fluctuation of the focus position accompanying the correction is corrected, the focus position stably exists on the light receiving surface of the infrared light sensor even if the magnification of the lens changes. As a result, a good infrared image can be read with a simple configuration in which the translucent body for changing the focus position is simply operated.
[0008]
  In addition, by providing the configuration according to claim 2, the translucent body for changing the focus position is configured by a plate glass, and the plate glass is interposed between the lens and the infrared light sensor as the magnification of the lens is changed. Being withdrawn and operated.
  When the plate glass is inserted between the lens and the infrared light sensor, the focus position moves in a direction away from the lens, approximately depending on the refractive index and the plate thickness of the plate glass. Therefore, by setting the glass plate to have a refractive index and a plate thickness that keeps the focus position away from the lens by a distance corresponding to the change in the focus position due to the change in the lens magnification, Can compensate for fluctuations.
[0009]
  Note that, if the plate glass is arranged between the lens and the infrared light sensor in this way, it may be a cause of aberration, but the change in the focus position due to the change in magnification is not so great that the aberration becomes a problem. Focusing on this, the focus position changing translucent body is constituted by a very simple member called a plate glass.
[0010]
Further, by providing the configuration according to claim 4, the optical path branching means for irradiating the visible light toward the visible light sensor and irradiating the infrared light toward the infrared light sensor is cold. Consists of mirrors.
A cold mirror is generally used as a reflector of a lamp, and reflects visible light and transmits infrared light to prevent overheating of an illumination light path. The design burden can be reduced by using a cold mirror.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in the case where the photographic film image reading apparatus of the present invention is provided in an image printing apparatus will be described below with reference to the drawings.
The image printing apparatus IP according to the embodiment of the present invention adopts a digital exposure type, and as shown in FIG. 1, a photographic film developed by a film developing machine (not shown) (hereinafter simply referred to as a film). A film scanner 3 as a photographic film image reading device that reads one frame image as digital image data, a controller 7 that processes the acquired digital image data to create print data, and photographic paper 2 based on the print data Are provided with a digital print unit 5 for exposing an image corresponding to the frame image and a development processing unit 6 for developing the exposed photographic paper 2. The photographic paper 2 developed by the development processing unit 6 is discharged as a finished print through a drying process.
[0012]
The film scanner 3 includes an illumination optical system 31, an imaging optical system 32, and an image reading sensor IS using a CCD sensor as main components.
The illumination optical system 31 includes a halogen lamp 31a as a light source, a reflecting mirror 31b that reflects the light from the halogen lamp 31a into a substantially parallel light, an infrared cut filter 31c, and light emitted from the halogen lamp 31a in a desired color. A dimming filter 31d for adjusting the balance and a mirror tunnel 31e for making the color distribution and intensity distribution of light uniform are provided.
[0013]
The image reading sensor IS of the film scanner 3 of the present embodiment will be described in detail later, but a visible light sensor 33a that detects a visible image of the film 1 and an infrared light sensor that detects an infrared image of the film 1 34a, and the infrared sensor 34a is configured to obtain the state of scratches and dust attached to the film 1 as image information. Therefore, the optical system also needs to allow the infrared light in the wavelength range to be detected by the infrared light sensor 34a.
Therefore, as shown in FIG. 3, the infrared cut filter 31c has a low transmittance in the infrared wavelength range of about 780 nm to about 1100 nm as a general rule. The transmittance is set slightly higher in the wavelength range of about 820 nm to about 890 nm.
[0014]
As shown in FIG. 4, the dimming filter 31d adjusts the color balance by giving the transmittance a predetermined wavelength dependency in the visible light region shorter than about 780 nm, and also adjusts the color balance from about 790 nm to about 780 nm. In principle, the transmittance is set to be slightly higher in the wavelength range of about 820 nm to about 890 nm, which is the detection target of the infrared light sensor 34a, while the transmittance is lowered in the infrared range of 1000 nm.
[0015]
The imaging optical system 32 functions as a lens for forming an image of the film 1 on the light receiving surface of the infrared light sensor 34a, and also forms an image of the film 1 on the visible light sensor 33a. And a mirror 32b as an optical path branching unit that bends the traveling direction of the light beam, an infrared cut filter 32c, a zoom lens unit 32a, and an infrared light sensor 34a so that the focus position is in the optical axis direction. A plate glass 40 serving as a focus position changing translucent body FT to be displaced is provided.
The zoom lens unit 32a is operated by the controller 7 so as to change the magnification in a plurality of stages according to the size of the film 1 and the print size to be produced. Specifically, the magnification is set to a low-magnification group set in a plurality of stages near 1 × and a high-magnification group of about 2 ×.
The mirror 32b is configured by a so-called cold mirror, and the visible light is reflected by the reflection surface of the mirror 32b, the path of the light beam is bent by 90 degrees, and is irradiated toward the visible light sensor 33a, while the infrared light is Most of the light passes straight through the mirror 32b and travels straight, and is irradiated on the infrared light sensor 34b.
[0016]
The infrared cut filter 32c is for reliably removing some of the infrared light reflected by the mirror 32b. Unlike the infrared cut filter 31c of the illumination optical system 31 described above, as shown in FIG. Even in the infrared wavelength range of 820 nm to about 890 nm, the transmittance is sufficiently lowered to prevent infrared light from entering the visible light sensor 33a.
The plate glass 40 serving as the focus position changing light-transmitting body FT is output by driving means (not shown) between the zoom lens unit 32a and the infrared light sensor 34a in conjunction with the change in the magnification of the zoom lens unit 32a. Retired.
By positioning the glass plate 40 in the optical path for reading the film image from the zoom lens unit 32a to the infrared light sensor 34a, the focus position where the image of the film 1 is imaged is moved away from the zoom lens unit 32a. Moving.
[0017]
As described above, the zoom lens unit 32a is set to a low-magnification group and a high-magnification group. When the magnification changes in this way, the variation of the focus position is sufficiently suppressed for visible light. Although designed, the focus position slightly changes for infrared light.
That is, as shown in FIG. 2A, when the position of the zoom lens unit 32a is “A”, the focus position in the visible light region exists at the position “B”, which is the zoom lens unit. Even when the magnification of 32a is changed to the above-described low magnification group and high magnification group, there is no change. On the other hand, in the infrared light region, when the magnification of the zoom lens unit 32a is set to the low magnification group, the position “C” is the focus position, and when the magnification is set to the high magnification group, the position “D” is the focus position. It becomes.
[0018]
Such fluctuations in the focus position between the low-magnification group and the high-magnification group are absorbed by moving the plate glass 40 in and out of the optical path for film image reading. More specifically, for example, if the focus position difference (Δf) between the low-magnification group and the high-magnification group in FIG. 2 (a) is “0.2 mm”, the plate glass 40 is used for film image reading. If the focus position is set to be away from the “0.2 mm” zoom lens unit 32a by being inserted into the optical path, the plate glass 40 is retracted from the optical path for reading the film image as shown in FIG. In this state, the light receiving surface of the infrared light sensor 34a may be positioned at the position “D” that is the focus position of the high-magnification group.
[0019]
By disposing the infrared light sensor 32a in this manner, when the magnification of the zoom lens unit 32a is set to the high magnification group, the infrared light can be obtained with the plate glass 40 retracted from the optical path for reading the film image. When the light receiving surface of the sensor 34a is in the focus position, and the magnification of the zoom lens unit 32a is set to the low magnification group, the plate glass 40 is inserted into the optical path for reading the film image in a posture orthogonal to it. The light receiving surface of the infrared light sensor 34a located at the position "D" is the focus position. As a specific numerical example of the plate glass 40 for moving the focus position away from the zoom lens unit 32a by “0.2 mm”, for example, when a plate glass 40 having a refractive index n of “n = 1.33” is used. This is realized by setting the thickness t of the plate glass 40 to about 0.6 mm in the approximate calculation of the paraxial region.
[0020]
The visible light sensor 33a photoelectrically converts visible light out of the light beam guided by the imaging optical system 32, and is provided corresponding to each color of red (R), green (G), and blue (B). The CCD line sensors are integrated on one chip, and each CCD line sensor is provided with a large number (for example, 5000) of light receiving elements arranged in the main scanning direction, that is, the width direction of the film 1. R, G, and B color filters are formed on the light receiving surface of the light receiving element.
The detection signal of the visible light sensor 33a is subjected to processing such as amplification and A / D conversion by the visible light signal processing circuit 33b, and is output to the controller 7.
[0021]
The infrared light sensor 34a has the same configuration as the visible light sensor 33a, but the visible light sensor 33a includes three CCD line sensors corresponding to R, G, and B, respectively. Only a CCD line sensor for infrared light is provided.
The detection signal of the infrared light sensor 34 a is subjected to processing such as amplification and A / D conversion by the infrared light signal processing circuit 34 b and is output to the controller 7.
[0022]
When the frame image of the film 1 is positioned at a predetermined scan position, the frame image reading process is started. The projected light image of the frame image is sequentially read by the visible light sensor 33a and the infrared light sensor 34a in the form of being divided into a plurality of slit images by the feeding operation in the sub-scanning direction of the film 1 by the film transport mechanism 9. Then, it is photoelectrically converted into R, G, B color component image signals and infrared component image signals and sent to the controller 7 as raw digital image data. Such control of the illumination optical system 31, the imaging optical system 32, and the image reading sensor IS of the film scanner 3 is performed by the controller 7.
The film scanner 3 has a function of reading print size information and the like magnetically recorded on the film by a magnetic reading head (not shown) in addition to reading the image data of the film.
[0023]
In this embodiment, the digital print unit 5 employs a PLZT shutter system. That is, as the exposure head 5a, a shutter array made up of PLZT elements is adopted. Light of each color of R, G, and B is introduced into each shutter from the light source unit 5b through the optical fiber bundle 53. The shutter array extends over the photographic paper 2 arranged in two rows along the width direction of the photographic paper 2, that is, the transverse direction of the conveying direction. When a predetermined level of voltage is applied to each shutter, a light transmission state ( When the voltage application is stopped, the light blocking state (closed state) is established. Corresponding to the pixels of the image to be exposed by each shutter, by opening and closing each shutter, image data for one line extending in the conveyance lateral width direction with a width of one pixel in the photographic paper conveyance direction at a time is exposed.
[0024]
Although not shown, the light source unit 5b includes a light source lamp, a dimming filter that adjusts light emitted from the light source lamp to a desired color balance, a rotation filter, and the like. The rotation filters are arranged such that optical filters of three colors of red (R), green (G), and blue (B) are arranged in the circumferential direction, and the rotation filters are always rotated at a high speed at a constant speed so that R, G , B selectively oppose the light source, and light of the selected color is sent to the shutter through the optical fiber through the filter of that color.
[0025]
Based on the image information of the image input from the film scanner 3, the controller 7 performs the above-described R, G, and B for each pixel, that is, for each shutter so that the image is properly reproduced on the photographic paper 2. For each exposure color, the length of time during which the shutter is opened is set as the exposure amount.
In addition to the PLZT shutter method, a liquid crystal shutter method, a fluorescent beam method, a FOCRT method, and the like are known as the digital print unit method, and can be arbitrarily selected according to the exposure specification.
[0026]
A transport system of the photographic paper 2 for transporting the photographic paper 2 to the digital print unit 5 and further transporting the photographic paper 2 exposed in the digital print unit 5 to the development processing unit 6 is shown in FIG. As described above, the photographic paper supply line 8A that conveys the photographic paper 2 in a single row, the exposure conveyance line 8B that conveys the photographic paper 2 in two rows, and the development conveyance line 8C are divided into the photographic paper supply line 8A and the exposure conveyance. Between the line 8B, there is provided a sorting device 4 that sorts the photographic paper 2 sequentially sent from the photographic paper supply line 8A into each row of the exposure transport line 8B.
[0027]
As is apparent from FIG. 1, the photographic paper supply line 8A selectively prints from one of the two photographic paper magazines 10 in which the long photographic paper 2 is housed in a roll shape with the photosensitive surface facing outward. The drawing roller group 8 a for drawing out the paper 2 and the pre-sorting roller group 8 b for delivering the photographic paper 2 to the sorting device 4 are configured.
A paper cutter 11 that cuts the photographic paper 2 drawn out from the photographic paper magazine 10 to a print size corresponding to an area for exposing each image is provided on the downstream side of the drawing roller group 8a. A back print unit 12 is provided on the downstream side of the paper cutter 11. The back print unit 12 prints a film ID, a frame number, correction information indicating image processing performed at the time of print data creation, and the like on the back surface (the surface opposite to the photosensitive surface) of the photographic paper 2. Usually, a dot-in-packed printer is used.
[0028]
The pre-sorting roller group 8b is disposed so as to sandwich the back print unit 12, and includes a driving roller 81 that contacts the non-photosensitive surface side of the photographic paper 2 and a pressure roller 82 that contacts the photosensitive surface side. 82 is displaceable from the driving roller 81 and can press the photographic paper 2 between the driving roller 81 and the pressing roller 82 or release it.
[0029]
The exposure conveyance line 8B includes a wide conveyance roller unit and a guide member corresponding to each row so that the photographic paper 2 cut corresponding to each frame can be simultaneously conveyed in two rows. I have. However, in the conveyance roller unit on the most upstream side of the conveyance, the driving roller 83 is a wide roller covering two rows, but the pressure roller corresponding to the driving roller 83 is a pressure roller 84a for the right row and a pressure roller for the left row. It is divided into a roller 84b. In other words, the pressure bonding / crimp release operation of the pressure roller 84a for the right row and the pressure roller 84b for the left row can be performed independently of each other, and the two sheets of cut photographic paper 2 are sequentially turned into the roller 84a and the pressure roller 84b. The two photographic papers 2 can be sent to the exposure position EP by the exposure head 5a at the same time.
[0030]
On both sides in the transport direction of the exposure position 5 of the exposure head 5a, a first transport roller R1, a second transport roller R2 on the exit side, and an electric motor for driving them are provided. The first conveying roller R1 includes a first driving roller 85 that contacts the non-photosensitive surface side of the photographic paper 2 and a first pressure roller 86 that is driven to move toward and away from the first driving roller 85. The second transport roller R2 is configured to include a second driving roller 87 that contacts the non-photosensitive surface of the photographic paper 2 and a second driving roller R2 that is driven to move in the approaching and separating direction with respect to the second driving roller 87. And 2 press-bonding rollers 88.
Switching between the pressure-bonded state and the released state of the first and second transport rollers R1 and R2 is controlled by the controller 7, and the transport state of the photographic paper 2 is changed while the photographic paper 2 is transported via the exposure position EP. , Three conveyances: a state in which conveyance is driven only by the first conveyance roller R1, a state in which conveyance is driven by both the first conveyance roller R1 and the second conveyance roller R2, and a state in which conveyance is driven only by the second conveyance roller R2. The state is sequentially switched.
[0031]
On the downstream side of the conveyance of the second conveyance roller R2, the conveyance path is curved with a curved guide (not shown), and along the path, the first turn driving roller 91 and the first turn driving roller 91 are curved. A first turn pressure roller 92 that is displaceable in the near and far direction, a second turn drive roller 93, and a second turn pressure roller 94 that is attached to face the second turn drive roller 93 are disposed. The curved guide (not shown) arranged between the first and second turn conveyance pressure-bonding rollers 91 and 93 is configured such that the guide portion on the non-photosensitive surface side is swung outward around a rocking fulcrum provided on the conveyance downstream side. The photographic paper 2 that is movable and passes through the curved guide can be expanded outward as necessary. Note that the pressing and holding of the printing paper 2 by the first turn driving roller 91 and the first turn pressing roller 92 is such that both of the printing papers 2 to be pressed and conveyed in two rows have passed through the exposure position EP, This is performed after the exposure operation is completed.
[0032]
As shown schematically in FIG. 1, the distribution device 4 that distributes the photographic paper 2 sequentially fed from the carry-out area of the photographic paper supply line 8A to the carry-in area of each row of the exposure transport line 8B is independently in the vertical direction. In addition, the first chucker portion 60A and the second chucker portion 60B that are driven to move in the horizontal direction are provided.
The first chucker unit 60A and the second chucker unit 60B are not shown in the figure, but can both sandwich and convey the photographic paper 2, and the first chucker unit 60A is received from the conveyance downstream end of the photographic paper supply line 8A. The photographic paper 2 is transferred to the pair of the intermediate driving roller 83 and the first intermediate pressure roller 84a, and the second chucker 60B receives the photographic paper 2 received from the conveyance downstream end of the photographic paper supply line 8A with the intermediate driving roller 83. The first chucker portion 60A and the second chucker portion 60B are alternately lifted and conveyed to the pair with the second intermediate pressure roller 84b, and the photographic paper 2 is distributed to each of the two rows of conveyance paths in the exposure conveyance line 8B. .
[0033]
Next, a print production operation in the image printing apparatus IP having the above configuration will be schematically described.
First, when the film 1 for producing a print is loaded into the film scanner 3, an image of each frame of the film 1 is read while being transported by the film transport mechanism 9.
The reading of the image of the film 1 reads the original image information photographed on the film 1 by the visible light sensor 33a and the original image information photographed on the film 1 by the infrared light sensor 34a. Instead, the image information of scratches and dust attached to the film 1 is read. The infrared light sensor 34a can read such image information because the infrared light incident on the film 1 is not affected by the captured image itself recorded on the film 1, but the film 1 This is because if there are scratches or dust, they are scattered and the amount of transmitted light decreases, and the presence of scratches or dust can be obtained as image information.
Thus, when reading the image of the film 1, as described above, when the magnification of the zoom lens unit 32a is appropriately changed according to the size of the film 1 and the print size, and set to a low magnification group, The plate glass 40 is inserted into the optical path for reading the film image.
[0034]
The visible image detected by the visible light sensor 33a and the infrared image detected by the infrared light sensor 34a are input to the controller 7 via the visible light signal processing 33b and the infrared light signal processing circuit 34b, respectively. Is done.
The controller 7 sets the exposure amount for each pixel for each color of the image exposed by the exposure head 5a based on the density information for each color of the visible image input from the visible light sensor 33a.
At this time, if there is a scratch or dust on the film 1, the detected density of the scratch or dust existing portion in the image detected by the visible light sensor 33a is changed from the density information of the original image, and the exposure amount as it is. When is set, the image quality of the obtained print deteriorates in the presence of scratches and dust.
For this reason, the controller 7 specifies the position of the scratch or dust on the film 1 based on the detection information of the infrared light sensor 34a, and the scratch or dust existing portion of the detected image information of the visible light sensor 33a. The detected density information is corrected from the density information of the surrounding images by a complementary process or the like, and the exposure amount is set based on the corrected density information.
[0035]
When the exposure amount is set for each pixel in this manner, the exposure head 5a performs an exposure operation with the set exposure amount on the photographic paper 2 that is transported through the exposure transport line 8B and passes through the exposure position EP. Exposure.
The photographic paper 2 that has been subjected to the exposure processing is conveyed to the development processing unit 6 for development processing, and after being dried, it is discharged as a completed print.
[0036]
[Another embodiment]
Hereinafter, other embodiments are listed.
(1) In the above embodiment, the plate glass 40 is exemplified as the focus position changing translucent body FT for shifting the focus position in the optical axis direction. However, the focus position changing translucent body FT is configured by a lens. May be.
(2) In the above embodiment, the case where the visible light and infrared light emitted from the halogen lamp 31a are coexisted in the optical path for reading the film image is exemplified. The image may be detected by a separate photometric stage. Even in this case, a variable-magnification lens set for visible light on the infrared image reading stage can be used.
(3) In the above embodiment, the zoom lens unit 32a is exemplified as a lens whose magnification can be changed. However, a so-called turret-type variable magnification lens in which a plurality of single focus lenses are arranged on a rotary stage is used. May be.
(4) The wavelength range to be detected by the infrared light sensor 34a is exemplified by a wavelength range of about 820 nm to about 890 nm, and this is various depending on the detection characteristics of the infrared sensor used in the infrared image detecting means. It will be changed.
(5) In the above embodiment, the light source is composed of the halogen lamp 31a and emits both visible light and infrared light. However, the light source is composed of a visible light source and an infrared light source. The optical system may be configured such that any of the emitted light from these light sources enters the optical path for film image reading.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of an image printing apparatus to which the present invention is applied.
FIG. 2 is a diagram for explaining the arrangement of infrared sensors according to the present invention.
FIG. 3 is a diagram showing wavelength characteristics of an infrared cut filter according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating wavelength characteristics of the light control filter according to the embodiment of the invention.
FIG. 5 is a diagram showing wavelength characteristics of an infrared cut filter according to an embodiment of the present invention.
[Explanation of symbols]
1 Photo film
31a Light source
32a lens
32b Optical path branching means
33a Visible light sensor
34a Infrared sensor
40 flat glass
FT Translucent body for changing focus position

Claims (4)

The visible light and infrared light emitted from the light source are irradiated on the photographic film, and the image of the photographic film placed in the optical path for image reading is displayed with the visible light sensor and the infrared light sensor. A photographic film image reading device for reading,
A magnification-changing lens unit that can be switched between a first magnification state and a second magnification state that is lower than the first magnification state, and an optical path from the magnification-changing lens unit for an optical path for visible light and infrared light And an optical path branching means for branching to the optical path,
The position of the visible light sensor is set so that the focus position of the visible image is on the visible light sensor in both the first and second magnification states, and the position of the infrared light sensor Is set so that the focus position of the infrared image in the first magnification state is on the infrared light sensor,
In response to the switching operation of the magnification changing lens unit from the first magnification state to the second magnification state, the magnification changing lens unit enters between the optical path branching means in the infrared light path and the infrared light sensor, and changes the magnification. A focus configured to retreat from between the optical path branching means in the optical path for infrared light and the infrared light sensor in response to a switching operation from the second magnification state to the first magnification state of the lens unit. A position-changing translucent body is provided, and the focus position of the infrared image based on the magnification-changing lens unit in the second magnification state is set to the infrared by the entry of the focus position-changing translucent body. A photographic film image reader configured to be on an optical sensor .   The photographic film image reading apparatus according to claim 1, wherein the focus position changing translucent body is formed of a plate glass. The photographic film image reading device according to claim 1 , wherein the magnification changing lens unit is a zoom lens unit . The optical path splitting means, the photographic film image reading apparatus according to claims 1, which is constituted by a cold mirror to any one of 3.

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