JPH065357B2 - Color photo printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a color photograph for obtaining a color image on a photographic paper by sequentially arranging a color image developed on a negative film on a light flux of three primary color additive color exposure filters. Regarding a printing apparatus.

[Prior Art] Generally, in order to print a color image on photographic paper using a three-primary-color additive exposure filter, R is placed on a light beam of a light source which passes through a color negative film so as to be orthogonal to the optical axis of this light beam.
Each of the (red), G (green), and B (blue) additive color exposure filters is inserted so that the three primary colors are separately printed on the printing paper.

As a means for printing, there is a method in which three light sources are provided, and additive color exposure filters for the three primary colors of RGB are fixedly arranged on the light flux of each light source, and the color negative film is simultaneously irradiated and baked (simultaneous printing). Color method). Since the exposure time of RGB can be overlapped, the processing time can be shortened, and the printing process can be performed at high speed, but three light sources and three shutters associated therewith are required,
There is a problem that the number of parts increases and the cost becomes high.

In order to solve this problem, a means has been considered in which one light source is used and each color-adding filter is sequentially inserted onto the light flux between the color negative film and the printing paper to perform exposure (sequential color-adding method).
This is a structure in which each of the plate-shaped additive color exposure filters is arranged such that the principal surfaces thereof are parallel to each other, and the respective drive units are sequentially reciprocally driven to sequentially arrange the additive color exposure filters on the light beam. With such a structure, the exposure time of each additive exposure filter cannot be overlapped, so high-speed printing cannot be performed, but only one light source is required and only one shutter is required. It will be cheaper.

However, since each additive exposure filter is driven separately,
Each drive unit is required, which leads to an increase in cost and the size of the device itself.

Therefore, each additive exposure filter is provided at a predetermined angle on a single rotary plate (turret) whose rotation axis is a position parallel to the optical axis of the light beam and deviated from the light beam, and the turret is rotated at a predetermined angle. Therefore, it is considered to arrange each color-adding filter on the light flux. By doing so, only one drive unit is required and the device itself can be made compact.

[Problems to be Solved by the Invention] However, in this turret type exposure, when the shutter is arranged at a position where each filter obtains the maximum exposure amount per unit time (the optical axis and the central portion of the additive exposure filter). Must be opened and closed for each color at a position) and the shutter must be opened and closed three times in one exposure process, and the durability of the shutter must be improved. Also, the shutter speed must be increased in order to shorten the printing processing time.

In consideration of the above facts, the present invention allows the shutter to remain open from the start to the end of exposure, enables low-speed shutter drive, and even if the turret is rotated while the shutter is open, the exposure time of each additive exposure filter remains unchanged. The aim is to obtain a color photographic printing device which can be optimized.

[Means for Solving the Problems] A color photographic printing apparatus according to the present invention is arranged between a negative film and a light source, and is rotatably supported by a rotation axis parallel to the optical axis of a light beam emitted from the light source. A turret capable of sequentially inserting the additive exposure filters of the three primary colors, which are attached at predetermined angles along the peripheral edge by rotating the rotary shaft by the driving force of the driving means, onto the luminous flux of the light beam.
The calculating means for obtaining the required exposure time while the turret is stopped from the integrated exposure amount during the rotational movement of the turret and the reference exposure time of each additive exposure filter, and the driving means for controlling the shutter to open the shutter. And a control means for rotating the turret and sequentially stopping each of the three primary color additive filters based on the required exposure time at the position where the exposure amount is maximum.

[Operation] When the negative film and the photographic paper are arranged at predetermined positions and the shutter is opened, the turret is rotationally driven by the driving means. Here, the first additive color exposure filter comes in on the light beam, but the exposure amount per unit time at this point is not the maximum and is within the range of arrow A shown in FIG. Cannot be directly added to the required exposure time. Similarly, the exposure time until the additive exposure filter passes the point where the maximum exposure amount per unit time is reached (point B in FIG. 4) and is eliminated from the light flux (range indicated by arrow C in FIG. 4). It cannot be added to the required exposure time. Here, in the present invention, the exposure amount while this additive color exposure filter is moving (the range shown in FIG. 4A and the range C) is obtained and divided by the unit exposure time at the maximum exposure amount to obtain the actual exposure time. Instead, the converted exposure time is obtained, and the converted exposure time is subtracted from the reference exposure time obtained from the calculation. This makes it possible to obtain the required exposure time for stopping the additive color exposure filter at the position of point B in FIG. 4, and it is possible to perform optimum exposure processing even with the shutter still open. The required exposure time may be similarly obtained for the other two color additive exposure filters, and the additional exposure filters may be sequentially stopped on the basis of the required exposure time.

As described above, in the present invention, since the exposure during the movement of the turret is also incorporated in the exposure time, it is not necessary to open and close the shutter at the point where each additive exposure filter has the maximum exposure amount per unit time. The durability is improved.

(Description of Embodiments) The turret is provided with an opaque portion, and the shutter can be omitted if the light-shielding property of the opaque portion is sufficiently taken into consideration. That is, when the non-transmissive portion is inserted on the light flux, the photographic paper is not exposed to light, so the photographic paper is placed at a predetermined position at this point. Here, when the rotation of the turret is started, the color-addition exposure filters are sequentially arranged on the light flux, and the exposure processing is performed. When the exposure process is completed, the photographic paper is not exposed to the opaque portion again on the light flux.

Further, by providing two non-transmissive portions on the turret and providing a transmissive portion between them, white exposure can be performed. That is, by arranging this transmission part on the light flux,
If white exposure is performed for a predetermined time, the exposure time by each additive exposure filter can be shortened and the processing speed can be increased.

[Embodiment] FIG. 1 shows an example of a photographic printing apparatus 10 according to the present embodiment, in which light emitted from a light source 12 is diffused by a light diffusion tube 14.
The color negative film 18 arranged on the carrier 16 is irradiated with the light through the lens unit 20, and the photographic printing paper 2 is irradiated through the lens unit 20.
It has a structure to be baked to 2.

A turret 26 including red (R), green (G), and blue (B) three-primary-color additive exposure filters 24R, 24G, and 24B is interposed between the light source 12 and the light diffusion tube 14. The turret 26 has a disk shape, and its center portion is fitted to a rotating shaft 30 which is rotated by a driving force of a step motor 28. The step motor 28 is the exposure controller 3
2 is controlled by a signal from the driver 34. Normally, after addition of the shutter 36 interposed between the lens unit 20 and the printing paper 22, the respective additive exposure filters 24R, 24G, 24B are sequentially arranged on the light flux, and stopped at the position where the maximum exposure amount of each additive exposure filter is reached, and the shutter 36 is closed after the end of a predetermined exposure time. Shutter 3
Reference numeral 6 is a signal from the exposure controller 32 and is moved in the direction of arrow B in FIG.

Here, as shown in FIG. 2, the additive exposure filter 2 attached to the turret 26 adjacently at a predetermined angle.
Adjacent to both ends of 4R, 24G, and 24B, the opaque portion 2
6A and 26B are provided at two places. This impermeable part 2
6A and 26B actually show a part of the members constituting the turret 26 itself, but in this embodiment, for the sake of clarity, they are shown by imaginary lines in FIG.
Further, between the two non-transmissive portions 26A and 26B, there is provided a transmissive portion 38 having both principal surfaces penetrating therethrough. Color exposure filters 24R, 24G, 24B
Separately from the exposure at the color negative film 18 to the photographic paper 22
It is adapted for white exposure.

Thus, the turret 26 includes three primary color additive color exposure filters 24R, 24G, 24B, two non-transmissive portions 26A, 2
6B and one transmissive portion 38 are divided into a total of six portions, which are evenly arranged with respect to each other. When the shutter 36 is opened, one non-transmissive portion 26A is disposed on the light beam and the turret. 26 is step-rotated by the driving force of the step motor 28 in the direction of arrow A in FIG. 2 (counterclockwise direction), the shutter 36 is closed by the other non-transmissive portion 26B, and a series of exposure processing is completed. When the transmissive portion 38 is arranged on the light flux and white exposure is performed,
The shutter 36 may be opened when moving from the other opaque portion 26B to the one opaque portion 26A.

By the way, in this embodiment, as described above, the turret 2
Even during the movement of 6, the shutter 36 remains open, so that the exposure amount from the time when one additive color exposure filter enters the light beam to the time when it exits is as shown in FIG. It will change. Further, since the exposure time by each additive exposure filter 24R, 24G, 24B is determined with reference to the point (point B in FIG. 4) that gives the maximum exposure amount shown in FIG. If the entire time allocated to is the exposure time, the exposure becomes insufficient and the exposure time is the overexposure with the stop time at the point of maximum exposure.

In this embodiment, the range other than the maximum exposure amount (the range of arrows A and C in FIG. 4) is integrated from the graph of FIG. 4 obtained at the rotation speed of the turret 26, and the integrated exposure amount is calculated. The optimum required exposure time (turret stop time) is obtained by converting the exposure amount into the exposure time at the maximum exposure amount and subtracting it from the reference exposure time input from the setter 39 to the exposure controller 32. .

Here, T _E : required exposure time when stopped T _EB : reference exposure time E _m : unit exposure amount at point B in FIG. 4 f (t): function shown in graph of FIG. CPU as shown
40, a RAM 42, a ROM 44, an input / output port 45, and a bus 46 such as a data bus or a control bus connecting these.

The equation (1) and the graph of FIG. 4 are tabulated and stored in the ROM 44, and the CPU 40 stores the additive color exposure filters 24R and 24R input from the setting device 39.
The required exposure time (turret stop time) T _B is calculated from the reference exposure times T _EB of G and 24B and the map of FIG. 4 based on the equation (1).

The operation of this embodiment will be described below with reference to the flowchart of FIG. 5 and the time chart of FIG.

First, in step 100, when the reference exposure time T _{EB of} each additive color exposure filter 24R, 24G, 24B is input from the setting device 39, in step 102, each additive color exposure filter 24R, 24G, 24B is calculated from the equation (1). Time (required exposure time T
_E ) ask. Here, each additive exposure filter 24R, 2
The required exposure times for 4G and 24B are as shown below.
This value is not limited.

R filter exposure time T _E (R) = 1.5 seconds G filter exposure time T _E (G) = 1.2 seconds B filter exposure time T _E (B) = 1.0 seconds In the next step 104, the turret 26 is rotated. The opaque portion 26A is arranged on the light flux. Next, step 10
The shutter 36 is opened at 6 and then the rotation of the turret 26 is started again at step 108 (direction of arrow in FIG. 2).
By rotating the turret 26, the filter 24R
Enters the luminous flux and after a predetermined time (t ₁ shown in FIG. 6)
The turret 26 is placed at a position where the exposure amount is maximized.
Rotation is stopped. In this case, since the turret 26 is rotating at a constant speed, the turret 26 has a predetermined time t ₁
It rotates by a predetermined angle according to. In this state, it is determined whether or not 1.5 seconds have passed since the operation was transferred to step 110. After 1.5 seconds, the process moves to step 111, the turret 26 restarts to rotate, the R filter 24R is gradually removed from the light beam, and the next filter 24G enters the light beam. Here, the turret 26 rotates by the same angle as described above and its rotation is stopped. However, since the additive color exposure filters 24R, 24G, and 24B are evenly arranged, the exposure amount of this filter 24G also becomes maximum. It will be stopped at the position. Next, at step 112, it is judged whether or not 1.2 seconds have passed. When 1.2 seconds have passed, the process moves to step 114, where the turret 26 rotates by a predetermined angle and the filter 24B reaches the maximum exposure amount on the luminous flux. Will be stopped at. When the exposure for one second by the filter 24B is completed (step 115), the process proceeds to step 116, the turret 26 is moved to the opaque portion 26B, and then the shutter 36 is closed at step 118.
This completes a series of exposure processes.

Here, in this embodiment, since the shutter 36 is continuously opened even while the turret 26 is moving, the additive exposure filters 24R, 24G, and 2 are also exposed during the time t ₁ shown in FIG.
4B exposure will be performed. However, the cumulative exposure amount during this period is calculated by calculating the number of seconds corresponding to the unit exposure amount at the position where the maximum exposure amount is obtained in the formula (1).
Since this value is subtracted from the reference exposure amount in advance, the exposure amount in each of the additive color exposure filters 24R, 24G, and 24B can be set to the optimum exposure amount. In this way, the shutter 36 may be opened and closed for each series of exposure processing, and a high shutter speed such as opening and closing when each of the additive color exposure filters 24R, 24G, and 24B is positioned at the maximum exposure position is not provided. Not required. Therefore, the optimum exposure amount can be maintained and the durability is improved.

Since the turret 26 of this embodiment is provided with the transmission part 38, the image of the color negative film 18 arranged on the carrier 16 can be directly transmitted and visually observed. This can be done by manually positioning the turret 26 on the transparent portion 38 and opening the shutter 36.

Further, by using the transmissive portion 38 and adding a white exposure process, the exposure time of each of the additive color exposure filters 24R, 24G and 24B can be shortened. That is, when each of the additive color exposure filters 24R, 24G, and 24B requires the exposure time, the exposure time after performing white exposure for 1 second is 0.5 seconds for the filter 24R and 24 seconds for the filter 24G.
Is 0.2 seconds, and the filter 24B is 0 seconds.
It can be shortened in seconds.

When such white exposure is performed, a series of exposure start positions of the turret 26 may be set to the non-transmissive part 26B, and a process of stopping the transmissive part 38 for 1 second may be added at the beginning of the exposure process.

Although the step motor 28 is applied to the driving means in the present embodiment, other driving means such as a motor or a cylinder that can be stopped at a predetermined angle may be used.

[Effects of the Invention] As described above, the color photographic printing apparatus according to the present invention is
You can keep the shutter open from the start to the end of exposure,
It has an excellent effect that the shutter can be driven at a low speed and the exposure time of each additive exposure filter can be optimized even if the turret is rotated while the shutter is open.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of a photographic printing apparatus according to this embodiment, FIG. 2 is a plan view of a turret, FIG. 3 is a block diagram of an exposure controller, and FIG. 4 is exposure corresponding to the moving time of the turret. FIG. 5 is a control flow chart and FIG. 6 is a time chart. 10 ... Photographic printing device, 12 ... Light source, 22 ... Printing paper, 24R, 24G, 24B ... Additive color exposure filter 26 ... Turret, 26A, 26B ... Impermeable part, 28 ... Step motor, 32 ...... Exposure controller, 36 ...... Shutter, 38 ...... Transmission section.

Claims (3)

[Claims] 1. A rotary shaft which is disposed between a negative film and a light source and which is parallel to an optical axis of a light beam emitted from the light source and which is rotated about the rotary shaft by a driving force of a driving means. A turret capable of sequentially inserting the additive exposure filters of the three primary colors attached at predetermined angles along the peripheral edge onto the luminous flux of the light beam, the cumulative exposure amount during the rotational movement of the turret, and the additive colors. An arithmetic means for obtaining a required exposure time while the turret is stopped from the reference exposure time of the exposure filter, and a driving means for controlling the rotation of the turret while the shutter is opened, and each of the three primary colors based on the required exposure time. A color photographic printing apparatus comprising: a control unit that sequentially stops the additive color filter at a position where the exposure amount is maximum. 2. An opaque portion is provided on the turret at a position on the same circumference as the additive color exposure filter,
The color photographic printing apparatus according to claim (1), wherein a position where the non-transmissive portion is inserted into the light flux is a shutter opening / closing operation position. 3. An additive exposure filter mounted on the turret has two non-transmissive portions on the same circumference, and a transmissive portion provided between these non-transmissive portions for transmitting the light flux. The color photographic printing apparatus according to claim (1), wherein the transmission section is provided for white exposure.