JPH07104566B2 - Photo printing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a photographic printing apparatus for printing an original image on a color paper, and more specifically, it relates the light of a halogen lamp to a color paper side and an image sensor side for photometry. The present invention relates to a photographic printing apparatus that efficiently divides into two.

[Conventional technology]

In a conventional photo printing apparatus, a halogen lamp and a color paper are arranged so as to sandwich the color original image, and the printing light transmitted through the color original image is projected onto the color paper by a printing lens. Further, in order to control the exposure amount of the color paper, a mirror is arranged between the original color image and the printing lens so that the mirror can be freely taken in and out, and the light reflected by the mirror during photometry is received by the photometric image sensor.

[Problems to be Solved by the Invention]

In the conventional photographic printing apparatus, since the mirror can be freely moved in and out of the optical path, there is a problem that the photographic printing cannot be efficiently performed in addition to the mirror setting mechanism.

This problem can be solved by arranging an optical path splitting means such as a beam splitter or a half mirror fixedly in the optical path and distributing the light transmitted through the color original image to the color paper side and the photometric image sensor side. In this case, considering the shortening of the printing time, it is desirable to increase the light on the color paper side. For example, as shown in FIG. 6, the ratio is 80% on the color paper side and 20% on the photometric image sensor side. It is usually set to.

However, in the case where the light from the halogen lamp is split at the above-mentioned ratio, although a sufficient exposure amount can be obtained with the color paper, the light amount in the sensor is insufficient and the detection accuracy is deteriorated. Occurs, resulting in inability to effectively use the light of the halogen lamp.

〔Purpose〕

The present invention has been made in view of the above points, and an object of the present invention is to provide a photographic printing apparatus that can efficiently use light emitted from a halogen lamp.

[Means for Solving the Problems]

Color paper has a spectral sensitivity characteristic that red sensitivity is considerably smaller than blue sensitivity. On the other hand, the spectral brightness of the halogen lamp has a characteristic that there are more blue light components than the spectral sensitivity characteristic of color paper.
On the other hand, the spectral sensitivity of the photometric image sensor has a characteristic that sensitivity to blue light is very low.

In consideration of the spectral characteristics of the halogen lamp, the color paper, and the photometric image sensor, the present invention sets the spectral characteristics of the optical path splitting means so that the ratio of blue light to the color paper side is low and the ratio of red light is high. It is set.

[Action]

In the present invention, since the spectral characteristics of the optical path splitting means are set according to the spectral characteristics of the halogen lamp, the color paper, and the image sensor for photometry, extra blue light for the color paper is cut off, and Since a large amount of blue light with low sensitivity is supplied, it is possible to obtain light having good spectral characteristics for both the color paper and the image sensor.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the overall structure of the photographic printing apparatus according to this embodiment. The light emitted from the halogen lamp 10 is sufficiently diffused in the diffusion box 12 and then the negative carrier 14
Color original set in, for example, color negative film 16
Illuminate. Between the diffusion box 12 and the light source 10, a cyan filter 18 for adjusting the red component of the illumination light, a magenta filter 20 for adjusting the green component, and a yellow filter 22 for adjusting the blue component. And are arranged respectively. The filter adjustment unit 24 adjusts the insertion amount of each color filter 18 to 22 into the optical path L according to the exposure amount signal supplied from the CPU 26. For example, if the insertion amount of the cyan filter 18 is increased, the red component of the illumination light is decreased, and the red exposure amount is decreased. The color negative film 16
Is pressed from above by a mask 28 operated by a solenoid (not shown) during photo printing.

Below the color negative film 16, a beam splitter 30
Of the light incident on the beam splitter 30 and the light transmitted through the beam splitter 30 is incident on the printing lens 32. On the other hand, the light reflected by the beam splitter 30 is reflected by the zoom lens 34, the half mirror 36, and the color filter.
The light enters the image sensor 42 for imaging and the image sensor 44 for photometry via 38 and 40, respectively.

Beamsplitter 30, as shown in FIG.
A reflective layer is formed by vapor-depositing a multilayer interference thin film 46 on one of the two right-angle prisms 30a and 30b, and the two right-angle prisms 30a and 30b are joined by a balsam 47. Is, for example, Ti as a high refractive index layer.
O ₂ and MgF ₂ as a low refractive index layer are formed by vapor deposition, and the desired spectral characteristics are given by adjusting the thickness of each of these layers.

The spectral characteristic of the beam splitter 30 according to the present embodiment is the third
In the figure, the spectral luminance characteristics of the halogen lamp 10 indicated by reference numeral 300, the spectral sensitivity characteristics of the color paper 48 indicated by reference numeral 400, and the image sensor 42 for image pickup and the image sensor 44 for photometry indicated by reference numeral 500 in FIG. It is set in consideration of the spectral sensitivity characteristic. That is, as shown by the reflection characteristic curve 600 and the transmission characteristic curve 700 of FIG. 5, the reflectance of the blue light which becomes redundant on the color paper 48 and is deficient in each sensor 42, 44 is increased, and the red light is As a result, the transmittance is increased.

As a result, the color paper 48 and each image sensor 4
Light with good spectral characteristics can be obtained for 2,44. Incidentally, the spectral sensitivity characteristic of the color paper 48 shows a waveform obtained by measuring the printing light with a spectrometer when the color paper 48 is finished in gray,
It is generally called a dead heat light source.

The zoom lens 34 is for adjusting the focal length according to the screen size of the color negative film 48 and for adjusting the size of all color images displayed on the monitor to the same size. Further, the half mirror 36 arranged behind the zoom lens 34 divides the optical path into two, and the light reflected by the half mirror 36 forms red, green, and blue areas at a predetermined pitch. The light enters the image sensor 42 for imaging through the mosaic filter 38, and the half mirror 34
The light that has passed through is incident on the photometric image sensor 44 via the mosaic filter 40.

The video signal output from the image sensor 42 for imaging is
A color image that is sent to the monitor device 50 and simulates a print photograph is displayed.

On the other hand, the photometric image sensor 44 is a color negative film.
This is for approximately three-color resolution photometry for each of the 16 pixels, and the red, green, and blue color signals of each pixel are sequentially read out for each color, and the time-series signals are supplied to the photometric device 52.

In the photometric device 52, the LATD value and the average of the specific area are calculated from the photometric value (three-color density value) of each pixel, which is logarithmically converted after A / D conversion of the time series signal of each pixel Various characteristic values such as density values are obtained, and pattern classification is performed using the average density of the area.

The monitor device 50 performs color correction in consideration of the spectral characteristics of the color paper 48 and the beam splitter 30, and displays the image of the finished print photograph. Where color paper 48
Since the characteristics of (1) vary depending on the photographic development method, the optical characteristics of the printing lens 32, etc., these characteristics are also taken into consideration.

The exposure amount of each color obtained by the photometric device 52 is supplied to the CPU 26, the CPU 26 calculates a filter value for each color according to the exposure amount of each color, and sends the filter value to the filter adjusting unit 24. In addition,
With this photometric device 52, the beam splitter 30
The fluctuation of the exposure amount based on the spectral characteristic of is corrected.

The input device 54 is capable of inputting color correction amount, density correction amount, operation instruction, print data and film type, print start command, etc. of the photo printing system, and the command and data input from here are It is sent to the CPU 26.

The plurality of printing lenses 32 are set on a turret 58 which is rotated by a motor 56, and a predetermined lens is selected according to the screen size of the color negative film 16 or the color paper 48 or the enlargement magnification determined by trimming, and this is set to the printing optical path L.
Set on top.

A shutter 60 is arranged below the printing lens 32. The shutter 60 is driven by a shutter drive unit 62 during photoprinting, and opens the photoprinting optical path L for a fixed time to expose the color paper 48. This color paper 48 is 1
When the photo printing of the frame is completed, the unexposed portion is pulled out from the supply reel 64 and set at the exposure position behind the paper mask 66. Then, the exposed portion is sent to a well-known photographic developing section 68 for photographic processing, and then cut into one frame by a cutter 70 and discharged to a tray 72. Reference numeral 74 is a feed roller for nipping and conveying the color paper 48, and reference numeral 76 is a cutter for separating the rear end of the exposed color paper 48.

Next, the operation and action of the embodiment configured as described above will be described.

First, print conditions such as film type, paper type, and enlargement ratio are input from the input device 54, and the frame of the color negative film 16 is positioned on the negative carrier 14.
At the start of the monitor, the color filters 18 to 22 are set to the standard position, and the CPU 26 automatically adjusts the zoom lens 34 to a magnification corresponding to the screen size of the color negative film 16.

The light emitted from the halogen lamp 10 passes through the color filters 18 to 22 set at the standard position, is sufficiently diffused by the diffusion box 12, and then reaches the color negative film 16. The light transmitted through the color negative film 16 enters the beam splitter 30 and is split with the spectral characteristics shown in FIG.

The light reflected by the beam splitter 30 is reflected by the zoom lens 34.
Incident on the half mirror 36 via the
The light reflected by 36 enters the image sensor 42 for imaging via the color filter 38, and the light transmitted through the half mirror 64 enters the image sensor 44 for photometry via the color filter 40. At this time, since the ratio of the light incident on the imaging image sensor 42 and the photometric image sensor 44 is blue, each image sensor can detect light of any color substantially uniformly.

Next, the photometric image sensor 44 separately reads the red, green, and blue color signals and supplies them to the photometric device 52. The photometric device 52 performs A / D conversion and logarithmic conversion of the temporally separated color signals, and then calculates the exposure amount in consideration of the spectral characteristics of the beam splitter 30.

The exposure amount of each color obtained here is supplied to the CPU 26, where the filter value is calculated for each color according to the exposure amount of each color,
This is sent to the filter adjusting unit 24. The filter adjustment unit 24
Depending on the filter value of each color, the color filters 18 to 22 are extracted stepwise from the standard position or are further inserted toward the center of the printing optical path L. This allows the color filter 18-
The insertion amount of 22 into the optical path L is adjusted stepwise, and the three-color light components of the printing light transmitted through the negative film 16 are adjusted to the ideal exposure amount characteristic indicated by reference numeral 400 in FIG.

On the other hand, the frame set at the printing position is a color filter.
It is irradiated with the light adjusted by 18 to 22, and in this state, an image is picked up by the image sensor 42 for image pickup. The video signal output from the image sensor 42 for imaging is monitored by the monitor device 50.
In consideration of the spectral characteristics of the beam splitter 30, amplification, clamping, γ correction, color extraction and masking processing are performed to display a color image simulating a print photograph.

Then, by observing the monitor device 50, it is determined whether or not the finish of the print photograph is appropriate. if,
When it is recognized that the color or the density is inappropriate, the correction amount is input through the input device 54. When this correction amount is input, the CPU 26 stepwise increases or decreases the automatically calculated exposure amount according to the correction amount, obtains a filter value corresponding to this corrected exposure amount, and again returns to the color filters 18- Adjust 22. Therefore, since the illumination state of the frame changes in accordance with the correction amount designated by the manual, a new color image whose color or density is corrected is displayed on the monitor device 50.

On the other hand, when it is recognized that the finish is good, by inputting the print start signal by operating the input device 54,
The turret 58 is rotated to set a predetermined printing lens 32, and immediately thereafter, the shutter 60 is actuated to print the frame recorded on the color negative film 16 on the color paper 48.

When the printing of one frame is completed, color paper 47
Is transferred by one frame, and the unexposed portion is set at the exposure position. Along with this, the color filters 18 to 22 are set to the standard position. Negative inspection and photographic printing can be performed on each frame in the same procedure.

In the above embodiment, the beam splitter 30 is used as the optical path splitting means, but the present invention is not limited to this, and a half mirror can also be used.

〔The invention's effect〕

As described in detail above, the present invention provides a halogen lamp,
Since the spectral characteristic of the optical path splitting means is set based on the spectral characteristics of the color paper and the image sensor, light having good spectral characteristics is supplied to both the color paper and the image sensor for photometry, and the halogen lamp supplies the light. There is an effect that the emitted light can be used efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing the configuration of a color photographic printing apparatus according to this embodiment. FIG. 2 is a perspective view showing the configuration of the main part of the beam splitter. FIG. 3 is a graph showing the spectral characteristics of the halogen lamp and the color paper. FIG. 4 is a graph showing the spectral sensitivity characteristics of the photometric image sensor. FIG. 5 is a graph showing the spectral reflection and transmission characteristics of the beam splitter. FIG. 6 is a graph showing a characteristic curve of a beam splitter whose transmission and reflection spectral characteristics are constant. 10 …… Halogen lamp 16 …… Color negative film 30 …… Beam splitter 32 …… Baking lens 44 …… Photometric image sensor 48 …… Color paper.

Claims (1)

[Claims] 1. Light from a halogen lamp that has passed through a photographic film is made incident on an optical path splitting means, and is split into two lights by reflection and transmission by this reflecting layer, one of which is made to enter a color paper, and the other light is made to enter. Light is incident on the photometric image sensor, and depending on the spectral sensitivities of the color paper and the photometric image sensor, the photometric easy sensor has a large amount of light in the blue wavelength range and the color paper has a red wavelength range of light. Photographic printing apparatus characterized in that the reflection / transmission spectral characteristics of the reflective layer are set so as to increase the amount of light.