JP3248600B2 - Imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image apparatus, and more particularly to an image reading apparatus and an image printing apparatus for obtaining information for reproducing a color original image by light from a light source which has transmitted or reflected the color original image. The present invention relates to an image device such as an image display device and an image copying device.

[0002]

2. Description of the Related Art A photographic printing apparatus (hereinafter, referred to as a printer) for printing an original image recorded on a color film (negative film, positive film) or the like on a color print photosensitive material (hereinafter, referred to as color paper) is known. This printer includes a light source device having a light source for irradiating a color original image, a control unit for controlling the amount of exposure to the color paper, and an optical system for forming an image on the color paper. This printer irradiates light from a light source onto a color original image, controls the exposure amount of light transmitted through the color original image, and forms an image on color paper to reproduce the color original image on color paper. are doing.

In order to efficiently irradiate only the visible light required at the time of exposure to this color original image, a light source is usually provided.
A reflector that transmits infrared light and reflects only visible light is disposed. In addition, for light that is not reflected by the reflector that directly reaches the color original image from the light source, heat rays are blocked by disposing an infrared cut filter or an infrared cut mirror in front of the light source. This prevents the peripheral portion of the color original image from thermally rising. Further, a cooling fan for cooling is provided near the light source device to suppress a rise in heat.

[0004] By the way, in a photographic film continuously irradiated with light, it is known that a thermotropy phenomenon occurs in which the spectral characteristics of the film dye change due to a rise in the temperature of the photographic film or the like. Therefore, when the same color original image is printed on a plurality of sheets, there is a problem that the spectral characteristics of the photographic film change with an increase in the number of prints. In order to prevent this, a cooling device for cooling the photographic film is further provided.

Further, even if the infrared light is removed from the light from the light source and the photographic film is cooled by the cooling device as described above, the temperature rise of the photographic film cannot be completely suppressed. In order to correct the chronological change in the spectral characteristics, the photographic film is photometrically measured periodically or as often as necessary, and the photographic film is corrected and printed according to the amount of change in the photometric value.

[0006]

However, during an enlarged print process for obtaining a large print image from a color original image of a predetermined size, the photographic film is irradiated with light during printing, that is, light from a light source device. Occasionally, the photographic film may be deformed such as curl.

Due to the deformation of the photographic film, the focus setting position of the color original image gradually shifts, so that the image forming position of the reproduced image is not formed at an optimum position on the photographic paper, that is, a phenomenon in which the focus is loosened occurs. This phenomenon is especially
A large exposure ratio (for example, a panorama-size photograph or a cropped photograph from 135 film) of an enlarged print that requires a long exposure time causes a large enlargement ratio of a reproduced image to an over-negative or color original image.

In view of the above facts, the present invention provides a reproducible image with high reproducibility even when printing by exposing a photographic film for a long time or when printing from a photographic film at a high magnification. It is an object of the present invention to obtain an image device capable of performing the following.

[0009]

According to the first aspect of the present invention, there is provided a light source, a mirror box for diffusing light from the light source to irradiate a color original image formed on a photographic film, and the color original image. A light-sensitive material that is irradiated with light transmitted or reflected and has sensitivity to light in a predetermined wavelength range, and the color original image irradiated with light from the light source through the mirror box is In an image apparatus for enlarging and projecting a photosensitive material at a predetermined magnification, at least the state of the color original image is not changed so that 700 nm, which is a wavelength exceeding the longest wavelength of the predetermined wavelength region among the light irradiated to the color original image, is used. A first type that reflects 90% or more of light having a wavelength exceeding the wavelength and approximately 1200 nm or less.
Optical member and 50% of light having a wavelength of approximately 1200 nm or more
The second optical member that reflects light is disposed between the light source and the mirror box.

[0010]

[0011]

[0012]

[0013]

[0014]

The present inventor has studied a phenomenon in which the position of the color original image gradually shifts from the focus setting position of the color original image due to the deformation of the recording medium such as a color negative film and the focus becomes rough, and the cooling efficiency using a photographic printing apparatus is used. Experiment by changing the parameters from every accuracy, such as
Shading of near-infrared light, which has not been taken into account in the past, is the deformation (curling) of a color original image in an image device.
Was found to be effective.

According to the first aspect of the present invention, a light source for irradiating a color original image formed on a photographic film such as a negative film or a reversal film, and a light transmitted or reflected from the color original image are irradiated. A photosensitive material such as color paper having sensitivity to light in a predetermined wavelength range. Since this photosensitive material has sensitivity to light in a predetermined wavelength range, information such as color and density for reproducing the color original image can be obtained by light transmitted or reflected through the color original image. . In this image apparatus, in order to reflect and shield near-infrared light that causes curling of the color original image formed on the photographic film, the light emitted from the light source to the color original image falls within the predetermined wavelength range. A first optical member that reflects at least 90% of light having a wavelength exceeding 700 nm, which is a wavelength exceeding the longest wavelength, and having a wavelength of about 1200 nm or less;
% Of the second optical member that reflects the light from the light source and the mirror box. As a result, the color original image formed on the photographic film is irradiated with light in a predetermined wavelength range in which the photosensitive material has sensitivity, and light having a wavelength exceeding the predetermined wavelength range, particularly light in the near infrared wavelength range. Irradiation can be suppressed. Therefore, the color original image formed on the photographic film can provide information for reproducing the color original image at the set focus position without being displaced or deformed by the light from the light source. Note that a conventional cut filter can be used for the first optical member, and a transmission type or reflection type optical member that only blocks light in the near infrared wavelength range is formed as the second optical member. Can be.

[0016]

[0017]

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment, the present invention is applied to a photographic printing apparatus 10. As shown in FIG. 2, a mirror box 18 and a lamp house 11 are arranged below the negative carrier 12 for transporting the negative film 20 to the printing section. Below the lamp house 11, a cooling fan 40 for cooling the periphery of the lamp house is arranged.

Above the negative carrier 12, the lens 2
2, a black shutter 24 and a color paper 26 are arranged in this order, and are illuminated from the lamp house 11 to be controlled by the light control filter 60, the cut filter, and the mirror box 1.
8 and the light transmitted through the negative film 20
2 forms an image on the color paper 26. A two-dimensional image sensor 30 that divides a negative image into a large number and performs photometry is disposed in a direction inclined with respect to the optical axis of the imaging optical system and at a position where the image density of the negative film 20 can be measured. . The two-dimensional image sensor 30 is connected to the control circuit 28. The control circuit 28 includes a keyboard 32 for inputting data and the like.
Is connected. The control circuit 28 is connected to control the dimming filter 60.

The lamp house 11 includes a lamp 11 such as a tungsten lamp or a halogen lamp that generates white light.
A is provided. A reflector 11B, which is formed in a parabolic shape and has a reflective surface inside, is attached to the lamp 11A. The mirror box 18 includes a hollow cylinder having a reflection surface formed on the entire inner surface, and diffusion plates 18A and 18B (FIG. 3) attached to both ends of the cylinder. The direct light from the lamp 11A and the reflected light reflected by the reflector 11B pass through the light control filter 60 and the cut filter unit 62 and enter the mirror box 18. In this mirror box 18, incident light is diffused and mixed in order to prevent color unevenness.

A light control filter 60 and a cut filter 62 are provided between the mirror box 18 and the lamp house 11.
Is arranged. As is well known, the light control filter 60 includes three color filters of a Y (yellow) filter, an M (magenta) filter, and a C (cyan) filter.

Here, the light from the lamp house 11 includes not only light in the wavelength range of visible light (about 380 to about 780 nm), but also heat rays having a large influence on temperature rise. In general, the specific energy spectral characteristics of the light source (lamp) are low on the short wavelength side and high on the long wavelength side. Therefore, in the photographic printing apparatus, the color negative film (see FIG. 7) in which the spectral absorption characteristics of the formed dye decreases from the short wavelength side to the long wavelength side, and the blue sensitivity layer has high sensitivity and red Color paper with lower layer (see Fig. 6)
, The spectral sensitivity is basically balanced. As can be understood from these figures, the spectral absorption characteristics of the negative film become lower at wavelengths of 800 nm or more, and the color paper becomes insensitive to light having a wavelength of about 750 nm or more. Therefore, in order to efficiently radiate only visible light to the color original image and efficiently block the heat rays, the photographic printing apparatus has a red light having a spectral transmittance characteristic shown in FIG. An outer cut filter was used.

However, since the near-infrared light does not directly affect the sensitivity of the photosensitive material (color paper), no consideration has been given to sufficiently attenuating the near-infrared light.

Therefore, in the present embodiment, a phenomenon in which the position of the color original image is gradually shifted due to the deformation of the color negative film and the focus becomes loose (for example, curling in which the negative film is deformed) has not been conventionally considered.
The problem is solved by shielding near-infrared light.

That is, the cut filter section 6 of the present embodiment
Reference numeral 2 denotes a vapor deposition filter (hereinafter referred to as a curling prevention filter) that blocks light having a wavelength of near-infrared wavelength or more to prevent curling of the infrared cut filter 64 and the negative film, which is an example of the present invention, as shown in FIG. 66).

As shown in FIG. 1, the anti-curling filter 66 has a transmittance of approximately 90% in the wavelength region of visible light.
When the wavelength exceeds the visible wavelength range, the transmittance decreases as the wavelength becomes longer. When the wavelength is 1200 nm, the transmittance is approximately 50% (preferably 50% or less) and the wavelength is 150 %.
At 0 nm, a transmittance of approximately 10% (preferably 10% or less)
(Lower transmittance) . The anti-curling filter 66 can be formed by coating a dielectric multilayer film composed of alternating layers using a low refractive index material and a high refractive index material by vacuum deposition.

FIG. 5 shows the spectral transmittance characteristics of the conventional infrared cut filter 64. When only the infrared cut filter 64 is used, the relative spectral energy distribution of the light illuminating the negative film 20 is, as shown by the solid line 80 in FIG.
m) and light having a wavelength of about 1200 nm or more.

The negative film 20 when the anti-curling filter 66 is further disposed on the infrared cut filter 64
The relative spectral energy distribution of the light irradiating is shown by a solid line 8 in FIG.
As indicated by 2, light having a wavelength of approximately 1200 nm or more is reduced, and the energy peak corresponding to light having a wavelength of approximately 1200 nm or more is reduced. Therefore, negative film 2
At 0, the irradiation of light in the near-infrared wavelength region, which is considered to be an element curling the negative film, is reduced.

Here, the present inventor has determined that the internal temperature of the photographic printing apparatus 10 (a plurality of points around the light source device, FIG. 3) when only the infrared cut filter 64 is used and when the anti-curling filter 66 is further used. Measurement points P _{1 to} P
₄ and the ambient temperature).
Note that a thermocouple type temperature sensor is used for the measuring device. The results of this experiment are shown in Table 1 below.

[0030]

[Table 1]

As described above, a slight temperature difference occurs on the upper surface of the diffusion plate of the mirror box. Here, it is known that temperature measurement is delicate and highly variable.
That is, it is difficult to specify a measurement site by a mounting tape or the like of a sensor mounting portion in a contact type sensor such as a thermocouple, and in a non-contact type sensor, a measured value changes depending on a wavelength used for measurement. For this reason, the required temperature may not be accurately grasped as a result.

The inventor of the present invention has made the laser based on the position at which the center of the negative film changes two minutes after the lamp is turned on, based on the position of the negative film before turning on the lamp (focus setting position). It was measured by a displacement meter. The measurement results are shown in Table 2 below.

[0033]

[Table 2]

However, in the above measurement, the outside of the image portion of the negative film was pressed against the negative carrier and measured.

The following four types of negative films having different densities are used as target negatives. U Negative: Under Negative Film N Negative: Normal Negative Film O Negative: Over Negative Film Oo Negative: Super Over Negative Film

As described above, although the use of the anti-curling filter of this embodiment caused only a slight temperature drop, the displacement of the negative film was reduced as compared with the case where the conventional infrared cut filter was used. It is understood that it can be suppressed to 以下 or less.

At this time, (No. (No) in Table 2 above)
Table 3 below shows the results of sensory evaluation of the in-focus state (degree of blur) when a plurality of identical image frames were printed using each filter.

[0038]

[Table 3]

However, the baking conditions and the results of the sensory evaluation in Table 3 above are defined as follows.

[Printing conditions] a) Target negative film S: Normal negative film having photographed image U: Under negative film N: Normal negative film O: Over negative film Oo: Super over negative film b) Negative film Size: 135F vertical c) Print size: 8 "x12" (203mm x 3
05mm) d) Magnification 9.07x: Maximum size of normal print 11.13x: Maximum trimming magnification from 135F negative e) Print method: Continuous printing of 10 sheets by timer baking [Results] ：: No change ○: Minor fluctuation △: Fluctuation within acceptable range X: Change, NG

As described above, according to the present embodiment, since the near-infrared wavelength of the light from the lamp is shielded, curling due to displacement of the color original image does not occur, and the color original image is printed on the photographic paper. Can be faithfully reproduced.

The anti-curling filter 66
Has a characteristic that, when the wavelength exceeds the visible wavelength range, the transmittance gradually decreases as the wavelength becomes longer.
It may be formed so that the transmittance of light in the near-infrared wavelength region exceeding the above wavelength is sufficiently low, and flatness and continuity of spectral characteristics are not required. Further, the anti-curling filter is inserted between the mirror box 18 and the lamp house 11, but the present invention is not limited to this.
It may be arranged between the mirror box and the negative film. For this reason, you may make it form by vapor deposition etc. in the entrance and exit of a mirror box, or one surface of the infrared cut filter 62 conventionally used. Further, it may be formed on another filter or a glass plate inserted in the optical path from the lamp to the negative film.

In the above embodiment, the anti-curling filter is formed by using a transmission type filter.
The present invention is not limited to this, and a reflective mirror may be used. In this case, a reflecting surface of a mirror for preventing curling may be arranged at any position on the optical path between the mirror box and the negative film, and the optical path may be deflected by the reflecting surface.

In the above embodiment, the case where the present invention is applied to a photographic printing apparatus has been described. However, the present invention is not limited to a photographic printing apparatus, and a color original image can be captured by an imaging apparatus such as a camera. It may be used for a light source unit of an image device that takes an image and displays an image on a display device. In addition, a copying apparatus that forms a reproduced image by copying a color original image from a photographic film such as a color negative film, and scans and reads a color original image by an area sensor such as a CCD to transmit data of the read image. It can be used for image devices that store, store, form images based on data, and analyze images.

[0045]

As described above, according to the present invention, since the color original image is not displaced by the irradiated light, the focus position of the color original image does not deviate, and the accurate focus state is obtained. There is an effect that a reproduced image can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a spectral transmittance characteristic of an anti-curling filter according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a photographic printing apparatus to which the present invention can be applied.

FIG. 3 is a schematic view showing the periphery of the lamp house of FIG. 2;

FIG. 4 is a diagram showing a spectral distribution of energy of light applied to a negative film.

FIG. 5 is a diagram showing a spectral transmittance characteristic of a conventional infrared cut filter.

FIG. 6 is a diagram illustrating spectral sensitivity characteristics of color paper.

FIG. 7 is a diagram showing spectral sensitivity characteristics of a negative film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Photo printing apparatus (image apparatus) 11 Lamp house (light source) 20 Negative film (color original image) 66 Curling prevention filter (optical member)

Continuation of the front page (56) References JP-A-1-1822841 (JP, A) JP-A-4-281403 (JP, A)

Claims (1)

(57) [Claims] 1. A light source, a mirror box for diffusing light from the light source to irradiate a color original image formed on a photographic film, and a light beam transmitted or reflected from the color original image and illuminating a predetermined wavelength range A photosensitive material having sensitivity to the light, and the color original image irradiated with light from the light source through the mirror box, in an image device that enlarges and projects at a predetermined magnification on the photosensitive material, In order not to change at least the state of the color original image, light having a wavelength of 700 nm or more, which is longer than the longest wavelength of the predetermined wavelength region, of the light applied to the color original image and having a wavelength of approximately 1200 nm or less is used. A light source and the mirror box, wherein a first optical member that reflects 90% or more and a second optical member that reflects light having a wavelength of approximately 1200 nm or more by 50% or more; Image apparatus being characterized in that disposed between the.