JPH0677129B2 - Photo printing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a photographic printing apparatus, and in particular to a color negative film located at an exposure position by irradiating light from a light source means,
The present invention relates to a photographic printing apparatus that exposes photographic paper with the transmitted light of a negative film.

[Prior Art and Problems] In a conventional photographic printing apparatus, generally, the image density of a negative film is measured by LATD, and the exposure amount is determined according to the photometric value. The photometric value in this case is, so to speak, mechanically measured, and the characteristics of various photographed images are disregarded for the time being, and uniform printing is performed by the change in the exposure amount corresponding to the photometric value obtained by the empirical rule. The thing
It is suitable for general photographed images, but if the image has a special color distribution or has an extremely bright portion, defective printing will occur. In the case of such an image, the operator corrects it and determines an appropriate exposure amount, but it requires a great deal of experience and skill, and it is still difficult to eliminate the defective print.

[Object of the Invention] The present invention was created in view of the above, and it is possible to perform the operation of determining the exposure amount while observing the positive image of the negative film, and moreover, the apparatus for performing this operation is compact. The present invention aims to overcome the narrow dynamic range, which is a drawback of the image pickup means for picking up an image of a negative film located at the exposure position.

[Means for Solving] The above-mentioned object is to provide a photographic printing apparatus which irradiates a negative film located at an exposure position with light from a light source means to expose the photographic paper with the transmitted light of the negative film. A measuring means for separating and measuring the three colors, a prism type beam splitter disposed in the optical path of the transmitted light of the negative film by the light irradiation of the light source means, and splitting the transmitted light into exposure light and imaging light. Arranged in the optical path of the imaging light that is spectrally separated by the prism type beam splitter,
An image pickup means for picking up an image of a negative film located at an exposure position, an ND filter arranged in the optical path of the image pickup light for adjusting the amount of light incident on the image pickup means, and a negative film measured by the photometric means. A conversion means for converting the image picked up by the image pickup means into a display positive image signal based on the amount of transmitted light, and a display for displaying a positive image on the basis of the display positive image signal converted by the conversion means. Means, input means for inputting correction information for the positive image displayed on the display means, shutter means arranged in the optical path of the exposure light split by the prism type beam splitter, and the input means The amount of exposure given to the photographic paper is controlled based on the correction information input by the photometer and the amount of transmitted light of the negative film measured by the photometric means. Photographic printing apparatus characterized by comprising an exposure control means for the, is accomplished by.

EXAMPLES Examples of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a first embodiment showing a photographic printing apparatus to which the present invention is applied, in which a negative film 1 is conveyed in a direction of an arrow by a conveying device (not shown), and an exposure unit 2 is exposed. At the position (exposure position), the image density is measured, the monitor TV is imaged, and the exposure is performed. Whether the negative film 1 is a normal long film or a disc film, only the film transporting or feeding device is different, and there is no distinction in using the device of the present invention. 3 is a light source, 4 is a filter, and 5 is a lens barrel. The negative film 1 is fixed on a mask 6 arranged in the optical path by a pressing frame (not shown). 7 is a magnifying lens, 8
Is a dark shutter, and 9 is a photographic printing paper, which is conveyed in the direction of the arrow and is printed on the printing mask 10 portion. 11 is a light receiving element for LATD photometry, and 12 is a three-color separation filter. The prism type beam splitter 17 is arranged in front of the expansion lens 7 on the way of the exposure light path, and the image pickup tube or the image pickup device 13 is arranged in the reflection direction thereof. The image pickup tube 13 uses a prism type beam splitter 17 for the image of the negative film at the position of the mask 6 (exposure position), and ND used if necessary.
After passing through the filter 15, an image is taken through the lens 16 and converted into an electric signal. This electric signal is processed by an electric circuit (not shown) and displayed on the monitor television as a black and white positive image.

FIG. 2 shows another embodiment of the arrangement of the image pickup tube 13 and the like. In the first embodiment, the same members are designated by the same reference numerals.

The feature of what is shown in FIG. 2 is that the prism type beam splitter 17 is arranged at the rear stage position of the enlargement lens 7 along the exposure optical path, the mirror is placed in the reflection direction, and the reflected light is projected on the focus image 19. is there. The light receiving element 11 for LATD photometry and the three-color separation filter 12 are arranged either on the exposure light path or on the image pickup tube side (on the image pickup light path).

In the case of this embodiment, the optical path for photography, that is, the prism type beam splitter 17 → the mirror 18 → the focus surface 19 is equal to the optical path for exposure, that is, the prism type beam splitter 17 → the optical path length of the photographic paper 9 surface. It is desirable to design them to be equal. In the case of such a design, even if the enlargement lens 7 is exchanged and the enlargement ratio is changed in order to print from the films of different sizes to the photographic paper of almost the same size, the image projected on the photographic paper 9 is changed. Since it always coincides with the image projected on the focused image, there is an advantage that it is not necessary to adjust the magnification on the side of the image pickup tube 13 according to the amount of change in the film size.

Next, referring to FIG. 3, an exposure amount determining method in the photographic printing apparatus of the present invention will be described.

The light projected from the light source 20 and transmitted through the negative film 21 is
It is converted into an electric signal by the light receiving element 23 for LATD photometry and the image pickup tube or the image pickup element 24. At this time, the ND filter 22 is used as needed so that the transmitted light is approximately in the middle of the dynamic range of the image pickup tube 24. LATD photometric detector 23
Is stored in the memory 26 of the central processing unit 25, and at the same time, the calculation circuit 27 calculates the exposure amount. 28 is a correction arithmetic circuit. On the other hand, the output of the image pickup tube 24 is amplified by the amplifier 29. At this time, the output of the amplifier 29 is controlled by the output signal of the arithmetic circuit 27 described above, and the amplifier 29 has a function of inverting a negative image into a positive image. Reference numeral 30 is a correction amplifier, and 31 is a monitor television, which displays a black and white image in accordance with the input signal from the amplifier 29.
If the operator observes a black-and-white image on the monitor TV 31 and the image density (luminance) is excessive or insufficient, the correction key 28K
Press to operate the correction calculation circuit 28 to calculate the corrected exposure amount. The calculation result is input to the correction amplifier 30 and observed by the operator as a change in the image density of the monitor TV 31. The operator repeats the above operation,
When the appropriate exposure amount is determined, the exposure key is pressed, the filter / shutter drive 32 is driven, and printing is performed.

The operator observes the image on the monitor television 31 as follows.

(1) For example, a part of the monitor TV 31 is used to store a reference signal in the central processing unit 25 so that an image density (luminance) of an appropriate exposure amount appears like a test pattern, and this image and the exposure amount will be determined. And the density of the TV image by the negative film 21.

(2) For example, as shown in FIG. 4, a frame 34 corresponding to the print screen size or the frame size of the negative film 21 is set on the screen 33 of the monitor TV 31, and the frame image of the negative film 21 is displayed in the frame 34. At the same time, a screen having a brightness corresponding to the standard print density of a human face is set in the outer frame, and the corrected exposure amount is determined by comparing the densities (luminance) of both. In this case, the standard brightness displayed on the outer frame may be the color of the sky or the sea, the color of trees, etc. in addition to the human face.

(3) As shown in FIG.
The image is divided into a and 33b, the frame image of the negative film 21 is projected on one side, and the image with the standard brightness of the above (2) is projected on the other side, and both are compared. In this case, even if several kinds of standard scenes of a photograph are prepared as a comparison screen, a comparative standard scene corresponding to the scene of the frame image of the negative film 21 is displayed, and both are compared to determine the correction exposure amount. Good.

EFFECTS OF THE INVENTION Since the present invention makes it possible to take an image of a negative film at the exposure position, it is possible to observe the image with the negative film set at the exposure position of the photographic printing apparatus. , Very useful in terms of installation space. In particular, according to the present invention, it is possible to overcome the narrow dynamic range, which is a drawback of the image pickup means for picking up the image of the negative film located at the exposure position, which is provided in the photographic printing apparatus,
Moreover, there is an effect that the adjustment can be easily performed, and that the positive image displayed on the display means can be accurately displayed.

[Brief description of drawings]

1 and 2 are schematic diagrams of a photographic printing apparatus to which the present invention is applied, FIG. 3 is a block diagram of the same, and FIGS. 4 and 5 are image configuration diagrams of a monitor television. 1, 21 ...... Negative film 3, 20 ...... Light source 8 ...... Dark shutter 9 ...... Printing paper 11, 23 ...... LATD Photometric light receiving element 12 ...... Three color separation filter 13, 24 ...... Image pickup tube or image pickup element 15, 22 …… ND filter 17 …… Prism type beam splitter 28 …… Compensation arithmetic circuit 28K …… Compensation key 29 …… Amplifier 30 …… Compensation amplifier 31 …… Monitor TV

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Uchida No. 1 Sakuramachi, Hino City, Tokyo Photo Konishi Roku Photo Industry Co., Ltd. (56) Reference JP-A-56-12634 (JP, A) JP-A-56-62243 (JP, A) JP-A-57-79938 (JP, A) J. H. Coote, Eiji Hozumi, translated by Tetsuro Tsuchiya "Photo Finishing-Color Photo Processing Technology and Its Equipment-" Kyoritsu Shuppan, Sho 52-3-20, P. 202 ~ 204

Claims (1)

[Claims] 1. A photographic printing apparatus which irradiates a negative film located at an exposure position with light from a light source means to expose the photographic paper with the transmitted light of the negative film, and separates the transmitted light of the negative film into three colors. And a prism type beam splitter which is disposed in the optical path of the transmitted light of the negative film by the light irradiation of the light source means and splits the transmitted light into exposure light and imaged light, and the prism type An image pickup unit arranged in the optical path of the image pickup light dispersed by the beam splitter and picking up an image of a negative film located at an exposure position; and an image pickup unit arranged in the optical path of the image pickup light and incident on the image pickup unit. An ND filter for adjusting the amount of light, and based on the amount of transmitted light of the negative film measured by the photometric means, converts the image captured by the imaging means into a positive image signal for display. A converting means, a display means for displaying a positive image based on the display positive image signal converted by the converting means, and an input means for inputting correction information for the positive image displayed on the display means, Based on the shutter means arranged in the optical path of the exposure light dispersed by the prism type beam splitter, the correction information input by the input means, and the transmitted light amount of the negative film measured by the photometric means. And an exposure control means for controlling the amount of exposure given to the printing paper.