JP2727158B2 - Photo printing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing apparatus,
The present invention relates to a photographic printing apparatus that irradiates light from a light source unit to a negative film located at an exposure position to expose photographic paper to light transmitted through the negative film. 2. Description of the Related Art In a conventional photographic printing apparatus, generally, an exposure amount is determined according to a total area average transmission density (LATD) obtained by measuring light transmitted through a negative film. [0003] In this method, a print of good tone and density is created from an image of an ordinary general object, but a poor print is obtained from an image of an object having uneven color distribution and brightness. Is created. For this reason, the operator directly observes the image on the negative film as a negative image, and corrects the exposure amount as needed for each image. [0004] However, in order to properly perform this correction, a great deal of experience and skill are required, and even a skilled technician can generate defective prints. Was difficult to eliminate. The present invention has been made in view of the above, and allows an operation of determining an exposure amount to be performed while observing a positive image of a negative film. In addition, it is an object of the present invention to reduce a reduction in the amount of captured light and distortion of a captured image when capturing an image of a negative film located at an exposure position. An object of the present invention is to irradiate a negative film located at an exposure position with light from a light source means and expose a photographic paper located at a printing position with light transmitted through the negative film. In a photographic printing apparatus, a light splitting means for splitting transmitted light of a negative film by light irradiation of the light source means into exposure light and image pickup light, and disposed on an optical path of the image pickup light split by the light splitting means, An imaging unit that captures an image of the negative film located at the exposure position; and an imaging unit that is disposed on an optical path of the imaging light separated by the spectral unit and is located at the exposure position. First imaging means for forming an image on the display, converting means for converting an image taken by the imaging means to a display positive image signal, and display positive image signal converted by the conversion means. Number based on the positive image and the standard print density.
Display means for projecting response was the image brightness together, an input means for correcting information for the positive image displayed on the display means is input, disposed in an optical path middle of the exposure light dispersed by the spectroscopic means A second image forming means for forming an image of the negative film positioned at the exposure position on a photographic paper positioned at the printing position; and a photographic paper based on the correction information input from the input means. Exposure control means for controlling the amount of exposure to be provided. The object of the present invention is to provide a photographic printing apparatus which irradiates a negative film located at an exposure position with light from a light source means and exposes a photographic paper located at a printing position to light transmitted through the negative film. Switching means for switching an optical path of light transmitted through a negative film by light irradiation of a light source means between an exposure optical path and an imaging optical path; and a switching means disposed on the optical path of the imaging light switched by the switching means, and Imaging means for capturing an image of the negative film located at the position; and an image of the negative film located at the exposure position, which is disposed on the optical path of the imaging light switched by the switching means, is connected to the imaging means. First imaging means for imaging,
A conversion unit that converts an image captured by the imaging unit into a display positive image signal, a display unit that projects a positive image based on the display positive image signal converted by the conversion unit, and the display unit Input means for inputting correction information for the projected positive image projected, disposed on the optical path of the exposure light switched by the switching means, the image of the negative film located at the exposure position,
Second image forming means for forming an image on the photographic paper positioned at the printing position, and exposure control means for controlling an exposure amount given to the photographic paper based on the correction information input from the input means. This is achieved by a photographic printing apparatus characterized by the following. An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic view showing an embodiment of a photographic printing apparatus to which the present invention is applied. A negative film 1 is conveyed in a direction indicated by an arrow by a conveying device (not shown).
At the position (exposure position), the measurement of image density, imaging for a monitor television, and exposure are performed. In addition, negative film 1
There is no difference in using the apparatus of the present invention, except that the apparatus for transporting or supplying a film is different between a normal long film and a disc film. Reference numeral 3 denotes a light source as light source means, 4 denotes a filter, and 5 denotes a lens barrel. The negative film 1 is fixed on a mask 6 arranged in the optical path by a holding frame (not shown). 7
Reference numeral denotes an enlargement lens serving as a second image forming means, reference numeral 8 denotes a dark shutter, reference numeral 9 denotes a photographic paper, which is conveyed in the direction of the arrow, and prints at a printing mask 10 (printing position).
Reference numeral 11 denotes a LATD photometric light-receiving element serving as photometric means, and reference numeral 12 denotes a three-color separation filter. A prism type beam splitter serving as a spectral unit or a mirror 17 serving as a switching unit is arranged in front of the enlargement lens 7 on the exposure light path, and an image pickup unit such as an image pickup tube or an image pickup device 13 is provided in a reflection direction (on the light path of the image pickup light). Is arranged. The image pickup tube 13 passes the image of the negative film at the position of the mask 6 (exposure position) through a prism type beam splitter or mirror 17 and an ND filter 15 used as necessary, and then through a lens 16 as first image forming means. Images are taken and converted into electrical signals. This electric signal is processed by a conversion unit described later, and is displayed as a black-and-white positive image on a monitor television as a display unit. The LATD photometric light receiving element 11 and the three-color separation filter
12 may be arranged on the imaging tube side (on the imaging optical path). As described above, the image of the negative film can be picked up at the position of the mask 6, so that a stage for printing and a stage for picking up images are separately provided. This is extremely beneficial in terms of installation space. Further, since the image of the negative film can be captured under the light source 3 to be actually printed, it is possible to capture an image that is faithful to the image to be printed. In other words, the consistency between the print image and the display image is improved. Good. Further, since the prism type beam splitter or the mirror 17 is disposed in front of the enlargement lens 7, when the image of the negative film located at the position of the mask 6 is imaged, the reduction of the imaged light amount and the distortion of the imaged image can be reduced. Can be. Next, an embodiment of a method for determining an exposure amount and a conversion means in a photographic printing apparatus according to the present invention will be described with reference to FIG. The light projected from the light source 20 and transmitted through the negative film 21 is converted into an electric signal by the LATD photometric light receiving element 23 and the image pickup tube or image pickup element 24. At this time, the ND filter 22 is used as necessary so that the transmitted light is substantially in the middle of the dynamic range of the image pickup tube 24.
The output of the LATD photometric light receiving element 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. Reference numeral 28 denotes a correction operation circuit. On the other hand, the output of the imaging 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, and the amplifier 29 has a function of inverting a negative image to a positive image. Reference numeral 30 denotes a correction amplifier, and 31 denotes a monitor television, which displays a black-and-white image in accordance with an input signal from the amplifier 29. The operator observes the black-and-white image on the monitor television 31, and if the image density (luminance) is too high or low, the operator presses the correction key 28K and presses the correction operation circuit 28.
To calculate the corrected exposure amount. The calculation result is input to the correction amplifier 30, and is observed by the operator as a change in the image density of the monitor television 31. The operator repeats the above operation, and when the appropriate exposure amount is determined, presses the exposure key and sets the filter / shutter drive 32.
Is driven to perform printing. [0013] The monitor TV 31 by the operator
Image observation is performed as follows. (1) A reference signal is stored in the central processing unit 25 so that an image density (brightness) of an appropriate exposure amount, such as a test pattern, can be obtained by using a part of the monitor television 31, for example. Is determined by comparing the density of the television image with the negative film 21 to be determined. (2) For example, as shown in FIG. 3, a print screen size or a negative film is displayed on the screen 33 of the monitor television 31.
A frame 34 corresponding to the frame size of 21 is set, and the frame image of the negative film 21 is projected in the frame 34, and a screen having a brightness corresponding to the standard print density of a human face is set in the outer frame. The corrected exposure amount is determined by comparing the densities (luminances) of the two. In this case, the standard luminance projected on the outer frame may be the color of the sky or the sea, the color of a tree, or the like, in addition to the human face. (3) For example, as shown in FIG. 4, the screen of the monitor television 31 is divided into 33a and 33b, and the frame image of the negative film 21 is projected on one of the divided screens, and the other is displayed on the other.
And an image with the standard brightness of is projected, and the two are compared.
In this case, several kinds of standard scenes of a photograph are prepared as a comparison screen, a comparison standard scene corresponding to the scene of the frame image of the negative film 21 is projected, the two are compared, and the correction exposure amount is determined. Good. [0017] [Effect of the Invention] Thus, the present invention, since it becomes possible to perform imaging of the image of the negative film in the exposure position, stages for the stage and the imaging for baking and has provided separately This is extremely advantageous in terms of installation space as compared with conventional devices. Also, since the image of the negative film can be captured under the light source to be actually burned, it is possible to capture an image that is faithful to the image to be printed,
In other words, good matching between the printed image and the displayed image, an excellent effect in photographic printing apparatus for Zaisa via the discretion of the operator. Furthermore, since the partial light unit is disposed in front of the second imaging means, when an image of the negative film is located in the exposure position, it is possible to reduce distortion of the reduction and the captured image of the imaging light amount. In addition, since the image of the brightness corresponding to the standard print density is displayed on the display means,
By comparing the image obtained by converting the frame image of the negative film into a positive image with the image, it is possible to more accurately input the correction information for the positive image.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a photographic printing apparatus to which the present invention is applied. FIG. 2 is a block diagram of a photographic printing apparatus to which the present invention is applied. FIG. 3 is an image configuration diagram of a monitor television. FIG. 4 is an image configuration diagram of a monitor television. [Description of Signs] 1 negative film 3 light source 7 enlargement lens 9 photographic paper 13 image pickup tube or image sensor 16 lens 17 prism type beam splitter or mirror 20 light source 21 negative film 28 correction operation circuit 28K correction key 29 amplifier 30 correction amplifier 31 Monitor tv

   ────────────────────────────────────────────────── ─── Continuation of front page        Panel     Referee Katsunori Ishii     Referee Hiromitsu Tanaka     Judge Kimio Yoshino                (56) References JP-A-49-1000037 (JP, A)                 JP-A-56-62243 (JP, A)                 Takeshi Sakakawa, One Outsider "Color Photography"                 New edition supplement (Showa 50-4-20)               Edition P. 72

Claims (1)

(57) [Claims] In a photographic printing apparatus for irradiating light from a light source unit to a negative film located at an exposure position and exposing transmitted light of the negative film to a photographic paper positioned at a printing position, the negative film is irradiated with light from the light source unit. Spectral means for separating transmitted light into exposure light and imaging light, and imaging means arranged on an optical path of the imaging light separated by the spectral means and capturing an image of a negative film located at the exposure position. A first imaging unit arranged on the optical path of the imaging light separated by the spectral unit and configured to form an image of the negative film located at the exposure position on the imaging unit; conversion means for converting the image to the display positive image signal, and a positive image based on the converted the display positive image signal by the converting means, standard purine
Display means for bets concentration begins to movies together with the image of brightness corresponding, input means for correcting information for the positive image displayed on the display means is input, the exposure light dispersed by the spectroscopic means A second imaging unit that is arranged on the optical path and forms an image of the negative film located at the exposure position on a photographic paper located at the printing position; and based on the correction information input from the input unit. hand,
Photographic printing apparatus, characterized by chromatic and exposure control means for controlling an exposure amount giving a paper, a.