JPS59101640A - Photograph printing device - Google Patents

Abstract

PURPOSE:To reduce defective prints by comparing the picture density of a correct exposure quantity stored in a frame memory, with the density of a television picture by a negative film. CONSTITUTION:A light transmitting a negative film 21 from a light source 20 is converted to an electric signal by a photodetector 23 and an image pickup tube 24. An output of the photodetector 23 executes an operation of an exposure quantity by a central operating device 25. An output of the image pickup tube 24 is amplified by an amplifier 29. In case when a white and black picture of a monitor television 31 is observed and excess or shortage exists in the picture density, a correcting operating circuit 28 is operated by depressing a correcting key 28K, and its result is observed as a variation of the picture density of the monitor television 31. An operator repeats said operation, and depresses an exposure key when a correct exposure quantity is determined, and drives a filter shutter drive 32, by which printing is executed.

Description

[Detailed Description of the Invention] The present invention relates to a photographic printing device, and in particular, it is possible to perform image density measurement and exposure amount adjustment extremely easily, and the mechanism or device for performing these operations can be designed compactly. regarding technical improvements.

In conventional photographic printing apparatuses, photometry is generally performed using LATD, which is the image density of a negative film, and the exposure amount is determined in accordance with the photometric value. In this case, the photometric value is measured mechanically, and a uniform print is produced by changing the exposure amount corresponding to the photometric value determined by empirical rules, ignoring the various characteristics of the photographed image. This method is suitable for general photographic images, but if the image has a special color distribution or has extreme brightness areas, defective prints will occur. . In the case of such an image, an operator performs correction and determines an appropriate exposure amount, but this requires a great deal of experience and skill, and even then it is difficult to eliminate defective prints.

This invention was created in view of the above, and its first object is to clarify a photographic printing apparatus that can measure the image density of a negative film and determine the exposure amount while observing a visible image. A second object of the invention is to enable a compact design of a device that performs the above operations, and another object of the invention is to:
This will become clear from the following description and the attached drawings.

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

FIG. 1 is a schematic diagram showing a first embodiment of the present invention, in which 1 is a negative film, which is transported in the direction of the arrow by a transport device (not shown), and at the position of an exposure section 2, the image density is measured and Exposure is performed.

In addition, even if negative film is a regular long film,
Alternatively, even if it is a disc film, there is no difference in the use of the apparatus of the present invention, only the film conveyance or supply device is different. 3 is a light source, 4 is a filter, 5
is the lens barrel. The negative film 1 is fixed onto a mask 6 placed in the optical path by a presser frame (not shown).

Reference numeral 7 denotes an enlarger lens, 8 denotes a dark shutter, and 9 denotes a photographic paper, which is conveyed in the direction of the arrow and reaches the printing mask 10, where printing is performed. 11 is a light receiving element for photometry (LATJ), and 12 is a three-color separation filter. Reference numeral 13 denotes an image pickup tube or an image pickup element, which passes an image of the negative film 1 located at the mask 6 position through a mirror 14 and an ND filter 15 used if necessary, and then captures the image through a lens 16 and converts it into an electrical signal.

This electrical signal is processed by an electrical circuit (not shown),
The image is displayed as a black and white positive image on the monitor TV.

At this time, you will be looking at the negative image from an angle, so
It is preferable to stretch the shrunken image using a monitor internal circuit or the like so that it resembles the original image. Note that when the mirror 14 is not used, the image pickup tube 13 and the like are arranged on the extension of the optical path A.

2 to 4 show other embodiments of the arrangement of the image pickup tube 13, etc., and the same members as those of the first embodiment are indicated by the same reference numerals. The feature shown in FIG. 2 is that a prism-shaped beam slitter or mirror 17 is disposed in front of the enlarging lens 7 in the middle of the exposure path, and an image pickup tube 13 and the like are disposed in the direction of reflection.

The feature of the system shown in FIG. 3 is that a prism-shaped beam slitter or mirror 17 (it may also be used as a mirror for a dark shutter) is placed after the enlarging lens 7 in the middle of the exposure path, and a mirror 1B is placed in the direction of reflection. The point is to project the reflected light onto the focus plane 19. In addition, LAT
The D photometric light receiving element 11 and the three-color separation filter 12 are
It is placed either on the street or on the side of the image pickup tube 13.

In the case of this embodiment, the optical path for photometry is prismatic beam slitter 17→mirror 18→focus surface 19.
It is desirable to design the optical path length to be equal to the exposure optical path, that is, the optical path length from the prism-shaped beam slitter 1T to the surface of the photographic paper 9.

FIG. 4 shows a photographic printing apparatus in which a photometric section is provided at a location separate from the exposure section, and an image pickup tube or image sensor 13 is arranged on the axis of the photometric optical path.

Next, a method for determining the exposure amount in the photographic printing apparatus of the present invention will be explained with reference to FIG.

Light projected from the light source 2o and transmitted through the negative film 21 is converted into an electrical signal by the LA'I'D photometric light receiving element 23 and the image pickup tube or image pickup element 24K. At this time, the ND filter drive 22 is driven as necessary so that the transmitted light is approximately in the middle of the dynamic range of the image pickup tube 24. The output of the LATD photometry light receiving element 23 is stored in the memory 26 of the central processing unit 25, and at the same time, the exposure amount is calculated by the calculation circuit 2T. 2B is a correction arithmetic circuit. On the other hand, the output of the image pickup tube 24 is amplified by an amplifier 29. At this time, the output of the amplifier 29 is controlled by the output signal of the arithmetic circuit 210 described above, and the amplifier 29 has a function of inverting a negative image into a positive image. 30d correction amplifier 31 is a monitor television, which displays a black and white image according to the input signal from the amplifier 29. The operator is a monitor TV 31 black and white W.
If the r image is observed and there is an excess or deficiency in image density (brightness), the correction key 28K is pressed to differentially operate the correction calculation circuit 2B to calculate the correction exposure amount. The calculation result is input to the correction amplifier 3o, and the image density (
observed by the operator as a change in brightness). The operator repeats the above operations, and once the appropriate exposure amount is determined, presses the exposure key to drive the Y, M, and 0.D shutter drives 32 to perform printing. Image observation is performed as follows.

(1) For example, using a part of the monitor television 31, store a reference signal in a frame memory or the like so that an image density (brightness) with an appropriate exposure amount appears like a test pattern,
Negative film 21 on which this image and exposure are to be determined
This is done by comparing the density (brightness) of the TV image.

(2) For example, as shown in FIG.
A frame 34 corresponding to the printing frame of the negative film 21 is set on the screen 33 of 1, and a frame image of the negative film 21 is projected in the frame 34, and a frame 34 corresponding to the standard print density of, for example, a human face is projected on the outer frame. Set a brightness comparison screen and compare the density (brightness) of both to determine the appropriate exposure.
Determine. In this case, the standard brightness displayed on the comparison screen may be a color other than a human face, the color of the sky or the sea, the color of trees, etc.

(3) As shown in FIG. 7, the screen of the monitor television 31 is divided into 33a and 33b, and the negative film 2
The frame image is displayed, and the screen with the standard brightness of (2) above is displayed on the other side, and the two are compared. In this case, prepare several types of standard photographic scenes as comparison screens, project the comparison standard scene corresponding to the scene of frame 1: 'A image of the negative film 21, compare the two, and determine the exposure amount. You may.

In this case, the screen showing the comparison standard scene is
It may also be formed using a gray scale method.

Further, the image of the negative film displayed on the screen of the monitor television includes cases where it is a single frame image and cases where it is a plurality of frame images. In the latter case, for example: A.
1' or at a stage prior to exposure, images are captured and stored in a storage device, and a series of images are displayed on a monitor television screen at once, in large numbers, or continuously.

By doing this, it is possible to easily compare overexposure, underexposure, color tone, use of strobe and use of strobe, etc. between common shooting scenes, and it is possible to determine the appropriate exposure amount more precisely. It becomes like this. In other words, the patent application in 1982
- As shown in the specification of No. 107633 (, the adaptation of the eyes caused by observing one frame at a time can be reduced by comparative observation of many images, the observation accuracy is increased, and it is convenient for the observer to observe many images). Defect images can be easily detected from the images, and when printing, it is necessary to deal with only the defective frames, making the work easier.Also, as shown in the specification, defect images from among the observed multiple images can be easily identified. By using an image observation apparatus having a means for specifying the information and a storage means for storing the information in correspondence with each other, it is possible to eliminate the occurrence of defective prints in photo prints.

In the above description of the embodiment, it has been explained that LATD photometry is carried out at or before the exposure position, but as shown in FIG. (% 4゜Gan Sho 56-903)
32), the light source light transmitted through the filter may be photometered by a photometer 36 placed in the lens barrel 5 (see Japanese Patent Application No. 56-92668 for details).

Since the photographic printing apparatus of the present invention is constructed as described above, it has the following advantages compared to conventional products.

(1) It has become possible to easily determine the exposure amount for each color negative film by observing the density (brightness) of a black and white image on a monitor television, which leads to a reduction in defective prints.

(2) Since the monitor television is black and white, the device can be made more compact and can be manufactured at a lower cost than when a color television is used.

(3) Since the negative film can be taken in by the image pickup tube at the exposure position, this is an advantageous design condition for making the device more compact.

(4) Since it is possible to display a portion or scene with comparative standard brightness on the monitor TV screen,
Does not require operator supervision.

[Brief explanation of drawings]

FIGS. 1 to 4 and 8 are schematic diagrams of a photo printing apparatus according to the present invention, FIG. 5 is a block diagram, and FIGS. 6 and 7 are image configuration diagrams of a monitor television. be. In the figure, 1 is negative film, 2 is exposure section, 3 is light source, 4 is filter, 5 is lens barrel, 6 is mask, 7 is enlarger lens, 8 is dark shutter, 9 is photographic paper, 10 is printing frame , 11 is a light receiving element for LATD photometry, 12 is a three-color separation filter, 13 is an image pickup tube or image sensor, 14 is a mirror, 1
5 is an ND filter, 16 is a lens, 17 is a prism beam slitter or mirror, 1B is a mirror, 19 is a focus plane, 20 is a light source, 21 is a negative film, 22 is N
D filter drive, 23 is a light receiving element for LATD photometry,
24 is an image pickup tube or an image sensor, 26 is a memory, 27 is an arithmetic circuit, 28 is a correction arithmetic circuit, 28 is a correction key, 2
9 is an amplifier, 30 is a correction amplifier, 31 is a monitor television, 32 is Y, M, 0. 'D. Filter tries, 33. 33 a, 33 b are monitor TV screens, 34 is a frame, 35 is a scanner, 3
6 is a photometric device Patent applicant Nobuaki Sakaguchi (and 1 other person), Patent attorney representing Roku Konishi Photo Industry Co., Ltd. No. 8
Figure 5 Figures 1, 25 Figure 6 Figure 7 Figure 7 (Voluntary initiative) January 31, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi > Display of 1988 Patent Application No. No. 209318 2 Name of the invention Photo printing device 3 Relationship with the case of the person making the amendment Applicant address Name (127) Roku Konishi Photo Industry Co., Ltd. 4 Agent 105 6 Number of inventions increased by the amendment 7 Subject of the amendment Specification (detailed description of the invention and brief description of drawings)
Drawing 8 Contents of Amendment Contents of Amendment (Fayikan Sho 57-209318) The description is amended as follows. l Correct the words rY, M, C, D, and J on page 6, line 17 to read "filter." 2. In the 9th line of page 7, the phrase ``Screen 33...--in the printing frame'' is corrected to ``Print screen size on the screen 33 or in the frame chair for the negative film 21''. 3. On page 8, line 5, correct the word "exposure" to "appropriate exposure." 4. On page 9, line 17, correct the word "exposure" to read "multipoint photometry, LATD photometry." 5. In the 4th line of page 10, correct the word "exposure amount" to "appropriate exposure amount." 6 In the 11th line of the same page, the phrase "negative film... of negative film" is corrected to "image of negative film captured by an image pickup tube." 7 rY, M, C, D on page 11, lines 15-16. Correct the phrase ``Fill No Drive'' to ``Filter Fist Shutter Drive.'' 8.Amend Figure 4 of the drawings as shown in the attached drawings. 9. In the drawings, Figures 3 and 8 are corrected as indicated in red on the attached drawings.

Claims (1)

[Claims] Capturing a negative film image, displaying it on a monitor TV as a black and white positive image, observing the shading of this image and performing correction operations to obtain the desired density (brightness) of the TV image.
A photographic printing device which is characterized in that the appropriate exposure amount is determined.