JPS63195647A - Printing device for extra printing - Google Patents

Abstract

PURPOSE:To perform extra printing to the same finish as a starting finish by detecting the image information of photographic paper which is already printed excellently in the same irradiation state as that when the image information of a negative film is detected. CONSTITUTION:A light source 12 which projects light on the negative film 18 and photographic paper 42 which is already printed is provided so as to detect light transmitted through the film 18 and light reflected by the photographic paper 42 which is already printed, and the image information of the negative film 18 and the image information of the photographic paper 42 which is already printed are obtained in the same irradiation state to obtain the same information detection reference. Thus, the image information of the photographic paper 42 which is already printed excellently and the image information of the negative film which is applied conventionally for exposure quantity correction are both used to determine the quantity of exposure, so the same finish with the photographic paper 42 which is already printed is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing apparatus for printing additional photographs, which exposes the photographic paper to light based on image information of already printed photographic paper during printing of the photographic paper.

[Prior art]

Generally, in a photographic printing apparatus, transmitted light from a light source transmitted from an original film is irradiated onto photographic paper through a lens unit, and the photographic paper is exposed.

The printing equipment used when printing color prints is
The light rays from the light source reach the original film through a light control filter composed of complementary color filters of yellow (Y), magenta (M), and cyan (C).

Here, an image density sensor composed of an optical sensor such as a photodiode is disposed between the original film and the lens unit, so that image density information of the original film can be detected.

This image density information is sent to the exposure controller, and the exposure amount for each color is calculated using the following equation, so that photographic printing processing can be performed with the optimum exposure amount that matches the original film. Note that this is based on the well-known Evans theorem.

7 o g Et −1 o g Ewr+C; (DN
J DNNJ ) ... (1) Here, E: Exposure amount of the original film EH: Exposure amount of the standard original film C: Correction coefficient based on the density of the original film DN: LATD of the original film DN: LATD of the standard original film i: Red, green, or blue j: Y, M, or C color By the way, there is no problem in the initial stage of simultaneous printing with such photo printing equipment, but if the customer wants to make additional prints. etc., and if you print based on the LATD of the original film, there will be changes in the light source and developer between the previous printing and the current printing, even if the same printing/developing machine is used. This was one of the complaints as the result could be different from the result when simultaneously printed. In addition, especially in the case of original film with uneven colors, workers make visual judgments and make subjective corrections, so the same corrections are not always made when reordering, resulting in similar complaints.

For this reason, the applicant proposed that the density be adjusted at the time of reprinting based on the photographic paper printed with the original film so that the finished quality would be the same as that of the original photographic paper. There is. In this case, it is preferable to detect the density of the image printed on the photographic paper.The light rays from the light source are reflected on the photographic paper, the density of this reflected light is detected, and based on this information, the above equation (1) is used. The obtained exposure amount is corrected.

[Problem that the invention seeks to solve]

°However, the light source for the transmitted light that passes through the original film and the light source for the reflected light that is reflected by the photographic paper have different configurations, and each light source's light intensity and color tone change over time, so the detected density may vary. There are cases where the standards do not fail,
There were cases where optimal exposure control could not be achieved.

In consideration of the above facts, the present invention detects image information on photographic paper that has already been printed well under the same irradiation conditions as when detecting image information on the original film, and prints with the same finish as the original. The purpose of the present invention is to obtain a printing device for printing enlarged photographs.

[Means for solving problems]

The printing device for printing extra photographs according to the present invention uses the image information of the teriyaki photographic paper that has been subjected to the printing process using the original film in addition to the image information of the original film to obtain the same color as the finished state of the teriyaki photographic paper. A printing apparatus for printing extra photographs that controls exposure so as to achieve a good finish, and includes a light source that irradiates the transmitted light that passes through the original film and the reflected light that is reflected by the terminating photographic paper. , the image information of the original film and the image information of the terminating photographic paper are set in the same irradiation state and the information detection criteria are made to match.

[Effect]

According to the present invention, the image information of the photographic paper that has already been printed well is detected, and the image information of the photographic paper and the image information of the original film, which is conventionally applied to exposure correction, are used. Since the amount of exposure is determined, it is possible to achieve the same finish as photographic paper with teriyaki printing.

Furthermore, in the present invention, the transmitted light that passes through the original film and the reflected light that is reflected by the terprinted photographic paper are irradiated from the same light source. image information can be obtained.

[Embodiments of the invention]

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

FIG. 1 schematically shows an example of a photographic printing apparatus 10, in which light emitted from a light source 12 is transmitted through a light diffusion tube 14 to a negative film as an original film placed on a carrier 16. The structure is such that the light is irradiated and printed onto photographic paper 22 via the lens unit 20.

Yellow (Y),
A dimming filter 24 composed of three complementary color filters of magenta (M) and cyan (C) is interposed. ! J1
The optical filters 24 are controlled by signals from the exposure controller 26 via drivers 28, 30, and 32, respectively, and normally filter colors that are no longer needed during internal light exposure to Y, M, and C. The colors are reduced using each filter.

Further, a density sensor 34 is disposed between the negative film 18 and the lens unit 20 to detect image density information of the three primary colors of red (R), green (G), and blue (B). . The i11 degree sensor 34 is constituted by an assembly of optical sensors such as photodiodes, and supplies the density distribution information signal of the negative film 18 transmitted by the light 'tA12 to the exposure controller 26 via the amplifier 36. There is.

The exposure controller 26 determines a correction coefficient based on the well-known Evans theorem to adjust the amounts of the three color components of YMC to produce gray, and controls the exposure amount EI according to the equation (1) above. .

That is, after the solenoid 40 constituting the shutter 38 is energized (starts exposure) by this EI, each light control filter 24 is sequentially inserted into the optical path starting from the one that has a sufficient amount of exposure, and the exposure of that color is finished, and the entire The exposure time is controlled.

The carrier 16 on which the negative film 18 is placed has a photographic paper placement section 44 on which photographic paper 42 that has already been printed is placed.
is formed, and serves as a placement area for photographic paper 42 that has already been printed by this negative film 18.

An opening 46 is provided on the printing surface of the photographic paper 42 in the photographic paper placement section 44.
is provided, and the light source 1 is transmitted through an optical system such as a mirror 48.
2, so that the light rays irradiated to the negative film 18 and the light rays irradiated to the photographic paper 42 change in the same way. Note that an optical system such as a mirror 48 disposed between the light source 12 and the photographic paper 42 is connected to the light source 1.
Other optical systems such as a lens unit may be used depending on the location of the light source 12, and are not necessarily required if the light source 12 can directly illuminate the negative film 18 and photographic paper 42.

A density sensor 50 having the same configuration as the density sensor 34 described above is disposed between the mirror 48 and the photographic paper placement section 44 of the carrier 16, and is irradiated with light from the light source 12 (in this embodiment, the mirror 4
The density of the printed surface of the photographic paper 42 reflected by the light source 12A shown by the imaginary line in FIG. 1 is detected.

Preferably, this density is an average value of the density of the entire image.

The density information signal detected by the density sensor 50 is supplied to the exposure controller 26 via an amplifier 52. Note that the bottom surface 54 of the photographic paper placement section 44 is gray, and when the photographic paper 42 is not placed in the photographic paper placement section 44 during the printing process of the negative film 18, the density is the same as the state in which no correction is required according to Evans' theorem. Information signals are provided to an exposure controller 26.

The exposure controller 26, as shown in FIG.
U56 (Central Processing Unit), R
AM5B (random access memory), ROM6
0 (read-only memory) and buses 62 such as data buses and control buses that connect these.

The output signals of the amplifiers 36 and 52 are respectively supplied to the input/output capotro 6 via an A/D (analog/digital) converter 64, and based on these signals, the input/output capotro 6 controls the solenoid 40 and the driver 2. , 30.32.

The ROM 60 stores the following equation based on equation (1) above.

110 g Et -j! OgEst+cj(D,
IjDwsi )+γJ (D□−Dwpj)...
(2) Here, γ: Correction coefficient D due to photographic paper density? : Density of photographic paper DNP: Density of standard photographic paper Based on this formula (2), the CPU 56 calculates the exposure amount E+ for each color (where i is red, green, blue), and further calculates the exposure time and each tone. The operating time of the optical filter 24 is calculated.

Next, the carrier 16 will be explained in detail.

As shown in FIG. 3, the carrier 16 is composed of a base 70 and a lid 72, each of which is connected at one long side with a hinge 74, so that the main surfaces thereof can be moved toward and away from each other. Base 70
A limit switch 75 is attached to the holder so that the open/closed state of the lid 72 can be detected. Note that the signal line of the limit switch 75 is connected to the exposure controller 26.

Two protrusions 76 and 78 extending parallel to the long sides are integrally formed on the front side of the base 70 in the third drawing, and a guide passage 80 for both widthwise ends of the negative film 18 is formed between these protrusions 76 and 78. It is said that Thereby, when the negative film 18 is moved in the longitudinal direction (in the direction of arrow A in FIG. 3), it is ensured that it is moved linearly.

A negative film 18 is placed in the longitudinally intermediate portion of the guide passage 80.
A rectangular through hole 82 corresponding to one portion of the light source 12 is provided through which the negative film 18 receives the light beam from the light source 12.

The lid body 72 also has a through hole 8 corresponding to this through hole 82.
6 is provided so that the light beam transmitted through the negative film 18 is irradiated onto the lens unit 20.

Below the through hole 86 in FIG.
is installed. As shown in FIG.
2 can be inserted and held. The base 70 is provided with the opening 46 corresponding to the portion surrounded by the frame 88, and when the lid 72 is closed, as shown in FIG. 1, the printing paper 42 can be printed. The surface is arranged to face a mirror 48.

That is, a predetermined frame of the negative film 18 is inserted into the through hole 8.
2. By inserting the end of the photographic paper 42, which has been well printed by this storage, into the frame 88 when it is conveyed to the position 86, density information of the photographic paper 42 can be obtained during one day's exposure of the negative film. is now possible.

The printing procedure of the photographic printing apparatus constructed as described above will be explained below with reference to the flowchart shown in FIG.

It is assumed that the light source 12 has already been energized and is emitting light.

First, the negative film 18 is placed on the carrier 16 and the third
It is moved in the direction of arrow A in the figure or in the opposite direction so that the surface to be baked corresponds to the through hole 82. During this movement, both ends of the negative film in the width direction are connected to the projections 76 of the carrier 16.
78, it can move linearly without meandering.

When the operator completes placing the negative film in the predetermined position 18, the operator then inserts the printed photographic paper 42 corresponding to the hook of the negative film 18 into the frame 88 and inserts it into the photographic paper placement section. 44.

As a result, the negative film 18 is deposited in the carrier 16 in a predetermined manner, and the photographic paper 42 is well printed by the predetermined hook.
and can be arranged as a pair, facilitating tasks such as verification.

After the above preparation stage is completed, in step 104, the lid 72 of the carrier 16 is rotated around the spindle of the hinge 74, and the base 70 and the lid 72 are in a closed state.
This is detected by the limit switch 75, and step 106
Move to. In step 106, the density of the cup is detected by the density sensor 34 using the light beam from the light source 12 that has passed through the negative film 18. At the same time, the light source 12
is also irradiated onto the photographic paper 42 via the mirror 48.

The second light beam is reflected by the photographic paper 42, and a density sensor 50 detects the density of the image printed on the photographic paper 42.

That is, the negative film 18 and the photographic paper 4 are exposed to the same light source.
Since the density of 2 is detected, there is no influence of lamp fluctuations that occur when density is measured using different light sources, and the power required for energizing the light source can also be reduced.

Here, the density of the negative film 18 and the photographic paper 42 detected by the density sensor 34.50 is the average value of the entire image, but it is also possible to detect only one important point.
2 is not placed in the photographic paper placement section 44, since the bottom surface 54 of the photographic paper placement section 44 is gray in advance,
The density detected by the density sensor 50 is approximately equal to the density of standard photographic paper.

In step 108, the exposure amount of each color is calculated based on each density detected in step 106 using equation (2) above. Note that when the photographic paper 42 is not placed as described above, the calculation is the same as the equation (1) above.

Next, the exposure amount of each color obtained in step 108 is converted into exposure time, and after being sorted in descending order of exposure time in step 110, in step 112, the shutter 3
Open 8 (energize solenoid 40). This results in
A predetermined amount of transmitted light from the negative film 18 reaches the photographic paper 22 via the lens unit 20, and exposure is started.

In step 114, each of the light control filters 24 is operated for a predetermined time, and the colors are cut in order from the color that has been exposed. When the exposure of all colors is completed, the process moves to step 116, and the shutter 38 is closed.

Next, in step 118, when the operator releases the carrier 16, this is detected by the limit switch 75, and the burning process ends. If another original film and photographic paper are placed in the carrier 16 and the carrier 16 is closed, the printing process continues.

Next, the subroutine of step 114 will be explained in detail with reference to FIG.

Each light control filter 24 is rearranged in step 110 in descending order of exposure time. For example, if the order is yellow (filter F1), magenta (filter F2), and cyan (filter F3), then yellow exposure is first performed in step 122. It is determined whether or not the time has ended, and if it is determined that the time has ended, a signal is sent from the exposure controller 26 to the guide bar 28 in step 124 to insert the filter F1 into the optical path.Next, in step 126 When it is determined that the magenta exposure time has ended, the driver 30 is activated in step 128 to insert the filter F2 into the optical path. Similarly, when it is determined in step 130 that the cyan exposure time, which is the longest exposure time, has ended, step 1
At 3Z, the motor 32 is operated to insert the filter F3 into the optical path, and the process returns to the main routine.

In this way, each light control filter is controlled by taking into account not only the density of the negative film in one day, but also the density of the good photographic paper 42 that has already been printed. For example, photographic paper during simultaneous printing) is approximately the same as
The finish can be made as follows.

Furthermore, since the light source 12 is shared by the negative film 18 and the photographic paper 42, there is no variation in chromaticity, etc., and costs can be reduced compared to providing separate light sources for each.

Furthermore, since the negative film 18 and the corresponding printed printing image 42 can be arranged as a pair on the carrier 16,
These verification tasks become easier.

〔Effect of the invention〕

As explained above, the printing apparatus for enlarged photographs according to the present invention has the following features:
Light source 1 for detecting image information on photographic paper that has already been well printed in addition to image information on the original film 1 Used under the same conditions as the light source for detecting image information on the original film, it produces the same finish as the already printed photographic paper. It has the excellent effect of being able to print more copies so as to increase the printing efficiency, and at the same time being able to be constructed at a low cost by using common expensive lamps, light sources, and their power sources.

[Brief explanation of the drawing]

1 is a schematic configuration diagram of the photo printing apparatus according to the present embodiment, FIG. 2 is a control block diagram, FIG. 3 is a perspective view of the carrier, and FIG. 4 is a sectional view taken along the line IV--IV in FIG. FIG. 5 is a control flowchart of this embodiment, and FIG. 6 is an exposure control subroutine. DESCRIPTION OF SYMBOLS 10... Photographic printer, 12... Light source, 16... Carrier, 18... Negative film, 24... Light control filter, 26... Exposure controller, 34.50... Density sensor , 42... Photographic paper, 44... Photographic paper arrangement section.

Claims (1)

[Claims] (1) In addition to the image information of the original film, exposure is controlled based on the image information of the printed photographic paper that has been printed using the original film so that the finished color is the same as that of the printed photographic paper. The printing device for printing enlarged photographs has a light source that irradiates the transmitted light that passes through the original film and the reflected light that is reflected by the printed photographic paper, and has a light source that irradiates both the image information of the original film and the printed photographic paper. A printing device for printing an enlarged photograph, characterized in that image information on photographic paper is exposed to the same irradiation state and information detection standards are made to match.