JP2525486B2 - Photo printing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a photographic printing method in which the same frame is continuously printed and exposed on a color paper.

[Conventional technology]

When exposed to a strong light such as a print lamp, the negative film reversibly fades with a response time of several seconds due to a temperature rise. For this reason, commemorative photos of people gathering,
Even when printing a large amount of the same frame in succession, such as postcards and greeting cards, perform photometry and calculation for each print to prevent changes in print density due to temporary fading. There is.

[Problems to be Solved by the Invention]

In the conventional photographic printing method, as shown in FIG. 3, photometry and calculation are sequentially performed after paper feeding, and then exposure is performed. By the way, processing time of about 0.1 seconds is required for photometry of a frame to be printed and calculation of exposure amount based on the photometry. Therefore, there is a problem that the processing capacity cannot be improved even during continuous printing of the same frame due to the processing time required for photometry / calculation performed for each print.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a photographic printing method capable of efficiently performing continuous printing of the same frame.

[Means for solving the problem]

In order to achieve the above object, the present invention performs photometry of an image of a frame to be printed and calculation of an exposure amount based on the photometry value during frame feeding of color paper.

[Action]

During continuous printing of the same frame, the negative film is always in a photometrically capable state, so the same frame is newly measured during frame feeding of the color paper after printing, and the exposure amount is calculated based on this. In this way, by starting photometry during paper feeding after printing, and performing photometry and calculation during this frame feeding, as shown in FIG. 2, the processing time of photometry and calculation is fed frame by frame from the next cycle. It can be included in the time, and the print processing time is shortened by the photometry and calculation time.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, the color paper 10 is wound into a roll and stored in a magazine 11. The color paper 10 is pulled out from the magazine 11 by the rotation of the conveyance roller pair 13 via the guide roller 12, and the exposure stage 15
Is set to The exposure stage 15 includes an easel mask 16 and a pressure plate 17. The conveying roller pair 13 is rotationally driven by a pulse motor 19 via a driver 18 to feed the color paper 10 frame by frame.

After the quality of the printing light from the light source 20 is adjusted by the cyan, magenta, and yellow color correction filters 22, 23, and 24, the printing light is uniformly diffused by the diffusion box 25, and the negative film 27 set on the film carrier 26. Illuminate the frame from below. The amount of each color correction filter 22 to 24 inserted into the printing optical path 32 is adjusted by the filter adjusting unit 21.

The image recorded on the illuminated frame is imaged on the color paper 10 on the exposure stage 15 via the printing lens 28.
A shutter is provided between the printing lens 28 and the color paper 10.
30 is arranged and is inserted into the printing optical path 32 by the shutter drive section 31 when a predetermined exposure amount is reached.

Further, a light receiver 33 is provided diagonally above the mask opening of the film carrier 26 at a position where a frame is viewed. The light receiver 33 measures the large-screen average transmission density (LATD) and sends it to the exposure amount calculation unit 35. The exposure amount calculation unit 35 calculates the exposure amount by a well-known calculation formula based on LATD and sends it to the controller 36.

The controller 36 controls each color correction filter based on the exposure amount.
In addition to controlling the insertion amount of 22 to 24 into the printing optical path 32 to adjust the printing light quality, it also controls the shutter drive unit 31 and the pulse motor 19 that feeds the color paper 10 in a frame. Controller 36
As is well known, it is composed of a microcomputer, and has a keyboard 37 for setting various modes and controlling each section.

Next, the operation of this embodiment will be described. First, load the negative film 27 to be printed into the film carrier 26,
The frame to be printed is set at the opening position of the carrier mask 26A. Next, after operating the keyboard 37 to input the number of prints, the print start key is operated. As a result, the controller 36 sets the filter adjusting unit 21 to the photometric position and causes the light source 20 to emit light, so that the negative film 27
Illuminate the frame. The light receiver 33 measures the LATD of the frame and sends it to the exposure amount calculation unit 35, which calculates the exposure amount.
At the time of this photometry and calculation, the controller 36 drives the pulse motor 19 to feed the color paper 10 frame by frame, and sets the unexposed color paper 10 to the exposure position.

Next, the controller 36 controls the filter adjusting unit 21 based on the exposure amount to set the color correction filters 22 to 24 at predetermined positions, and then opens the shutter 30 for a predetermined time to print the frame image on the color paper 10. Expose. After completing the first printing, the controller 36 feeds the color paper 10 frame by frame. Further, during the frame feeding, as shown in FIG. 1, the frame of the negative film 27 is measured by the photo detector 33, and a new exposure amount is calculated. Thus, even if the negative film is temporarily discolored due to heat immediately after printing, the exposure amount can be corrected correspondingly. And so on
Start frame feeding and photometry of color paper 10 at the same time,
During the frame feeding of the color paper 10, the photometry and the exposure amount are calculated. As described above, when the paper is fed frame by frame, the metering for the next print (about 0.1 seconds) and the metering (about 0.1 seconds) are performed. Therefore, when the present invention is applied to the conventional machine, the print cycle time is 1 second. It has been 0.8 seconds since then, and a capacity improvement of about 25% has been obtained.

In the above-described embodiment, the photometry and calculation are completed during the paper feeding, but when the photometry and calculation time is longer than the paper feeding time, the exposure is naturally performed after the photometry and calculation are completed. In the above embodiment, photometry is performed at the same time as the paper feeding is started. However, when the photometry and exposure amount calculation time (about 0.2 seconds) is shorter than the paper feeding time (about 0.8 seconds) as in the embodiment. In order to minimize the influence of the temporary reversible fading phenomenon due to heat, it is advisable to delay the photometric start time so that the calculation of the exposure amount is finished just before the end of the paper feeding.

Further, in the above embodiment, the LATD of the frame is measured by the light receiver 33, and the exposure amount is calculated based on this.
Alternatively, the color image area sensor may be used to perform three-color separation photometry on each part of the screen, and scene determination and the like may be automatically calculated based on the photometry, and the exposure amount control may be performed with high accuracy based on this.

Further, in the above embodiment, the special machine for continuously printing the same frame is explained, but instead of this, the present invention can be applied to a general photographic printing apparatus for sequentially printing and exposing each frame of a negative film. You can also In this case, the continuous print mode is set, and this mode is designated by the keyboard when performing continuous print. In the normal sequential print mode, the controller performs frame feeding of negative film and frame feeding of color paper, and after the frame feeding is completed, the frames set on the carrier mask are metered and the exposure amount is determined based on this. Calculate
In the continuous print mode, the frame feeding of the negative film is stopped, and the photometry and the exposure amount are calculated during the frame feeding of the color paper.

〔The invention's effect〕

As described above, according to the present invention, the metering of the frame to be printed and the calculation of the exposure amount are performed during the frame feeding of the color paper. Therefore, the metering and the calculation and the frame feeding of the color paper are performed. The processing can be performed in parallel, and the print cycle time can be shortened by the processing time of photometry and calculation. Therefore, continuous printing of the same frame can be efficiently performed. In addition, the control procedure can be implemented by slightly changing the control procedure, and a new device configuration is not required. Therefore, the implementation cost for improving efficiency can be kept low.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a print cycle in the photographic printing method of the present invention. FIG. 2 is a schematic diagram showing a photographic printing apparatus embodying the present invention. FIG. 3 is an explanatory view showing a print cycle in the conventional photo printing method. 10 …… Color paper 13 …… Conveying roller pair 27 …… Negative film 33 …… Receiver.

Claims (1)

(57) [Claims] 1. A photographic printing method in which the same frame is continuously printed and exposed on color paper, and during the frame feeding of the color paper, photometry of an image of a frame to be printed and calculation of an exposure amount based on the photometric value are performed. A method for printing a photograph, which comprises performing