JP2529324B2 - How to move the head position of photo enlarger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for moving a head position of a photographic enlarger, and more particularly to a method for moving a head when exchanging an original film such as a negative film.

[Prior art]

Conventionally, when printing a photograph on a light-sensitive material, the magnification of the image printed on the light-sensitive material with respect to the image of the original film such as a negative film is determined by using a stretcher, and the head of the stretcher is set on the enlargement machine installation surface based on this magnification. After that, the exposure is performed after the vertical movement.

In such an enlarger, a light source is arranged in the main body of the apparatus, a light ray is irradiated from below the negative film, and a type (so-called inverted type) in which a light-sensitive material is exposed through a lens arranged in a head, The head is provided with a light source and a lens, a negative film is interposed between the light source and the lens, a light beam is emitted from above the negative film, and the transmitted light is passed through the lens and onto the table of the apparatus main body. There is a type (so-called upright type) of irradiating and exposing the light-sensitive material arranged. The negative film is usually loaded in the negative carrier and mounted on the enlarger.When the exposure by one negative film is completed, the worker detaches the negative film from the enlarger and replaces it with the next negative film. And then put it back on again.

[Problems to be solved by the invention]

However, in the case of the inverted type enlarger, since the negative film vertical position is not changed and the negative carrier is within the reach of the worker in a seated state, there is no problem, but that of the upright type enlarger. In this case, since the negative carrier is loaded in the head, it is moved up and down according to the magnification when adjusting the magnification. When it is necessary to replace the negative film after performing the baking work at a high magnification, the head is located above the worker, so the worker does not reach in the seated state and stands up each time to remove the negative carrier. It must be made. If such work is frequently performed, workability is deteriorated. For this reason, it is sufficient to specify a low magnification by operating the key on the operation panel and move the head downward when replacing the negative carrier, but normal head movement always moves while adjusting the focus. Therefore, there is a time for calculation processing and the like, the moving speed is slow and the work efficiency is deteriorated.

In order to eliminate this, if the head is moved without focusing, the moving speed can be increased, but in this case, after replacing the negative carrier, check whether the negative film is held in the proper position. There is a problem that it cannot be judged. That is, the out-of-focus image cannot reliably grasp the negative position.

In consideration of the above facts, the present invention provides a head position moving method for a photographic enlarger which can move the head to a predetermined position quickly and can focus after positioning to the predetermined position to improve work efficiency. The purpose is to obtain.

[Means for solving problems]

A head position moving method for a photo enlarger according to the present invention is a film carrier in which an original image film is held on a head provided with a light source and a lens, and the head is moved in an optical axis direction based on a designated magnification. In a photographic enlarger that moves and positions and at the same time changes the distance between the lens and the original image film to focus, then forms an image on the photosensitive material at the predetermined magnification by the transmitted light that has passed through the original image film,
When the original image film is exchanged, the head is moved in the optical axis direction without being focused and positioned at a predetermined original image film exchange position, and then the focus is adjusted during the original image film exchange time.

[Action]

Therefore, since the head can be moved to a predetermined original image film exchange position regardless of the current position of the head, the original image film can be easily exchanged. Also, at this time, since the focus is not adjusted,
The film carrier can be moved at a speed faster than the normal moving speed based on the specified magnification, and the film carrier can be quickly replaced.

In the present invention, after positioning to the original image film replacement position,
The focus is adjusted when the original film is replaced. That is,
Focusing may be performed after the head is positioned at the film carrier replacement position and before the replacement is completed. This makes it possible to confirm whether or not the original film has been held at the proper position after the original film has been exchanged, and no inconvenience occurs during the subsequent exposure processing.

〔Example〕

A photographic enlarger to which the present invention is applicable will be described in detail below with reference to the drawings. As shown in FIG. 1, a so-called upright type photo enlarger main body 10 has two columns inside its support (not shown).
Book support shafts 12 and 14 are erected parallel to each other, and a seizing magnification adjusting head portion 16 and a focus adjusting portion 18 are screwed into male threads formed on the support shafts 12 and 14, respectively. .
Rotation shafts (not shown) of pulse motors 20 and 22 are coaxially fixed to the bases of the support shafts 12 and 14, respectively, so that the drive shafts of the pulse motors 20 and 22 cause the support shafts 12 and 14 to rotate. It has become. Here, as the respective support shafts 12 and 14 rotate, the head portion 16 or the focus adjusting portion 18 is independently moved in the axial direction of the support shafts 12 and 14.

The head section 16 is composed of a lamp house section 24 and a negative carrier loading section 26, and a halogen lamp 28 and a dimming filter 30 are sequentially arranged in the lamp house section 24. The dimming filter 30 is composed of yellow (Y), magenta (M), and cyan (C) filters, and these filters are independently driven in the direction perpendicular to the optical axis by the driving force of the driving unit 32. It is arranged so that it can be moved. The negative carrier 34 is loaded in the negative carrier loading section 26, and the negative film 36 is held in the negative carrier 34.

The head portion 16 and the focus adjusting portion 18 are connected by a bellows 38, the inside of the head portion 16 and the inside of the focus adjusting portion 18 are in communication with each other, and are shielded from the outside, and both can be approached and separated. An enlargement lens is provided at the lower end of the focus adjusting unit 18 in FIG.
40 is installed. Light rays from the halogen lamp 28 through the dimming filter 30, the negative film 36, and the enlargement lens 40 are imaged on the photographic paper arranging portion 44 on the table 42 of the enlarger body 10, and a worker seated on the chair 46 The projection image of the negative film 36 can be viewed.

Further, an operation panel 50 is provided on the table 42 of the enlarger main body 10, and the operation panel 50 is configured so that measurement data can be input, a setting magnification can be set, and trimming can be performed.

Further, when the printing paper 52 is placed on the placement portion 44 of the table 42, the image of the negative film 36 is formed on the printing paper 52 when the halogen lamp 28 is turned on.

The operation panel 50 is connected to a microcomputer 54 having a RAM, a ROM and a CPU. Further, the microcomputer 54 includes the pulse motors 20 and 22 and a driving unit.
32 is imaged, and a drive signal is output based on an instruction from the operation panel 50.

Here, the negative carrier replacement switch 56 is attached to the operation panel 50, and the negative carrier replacement switch 56 is attached.
Is operated, the head portion 16 is moved to the position of the imaginary line in FIG. 1 together with the focus adjusting portion 18.
In this case, the head section 16 and the focus adjustment section 18 are moved at substantially the same speed, and are moved at a speed higher than the magnification and the focus adjustment speed during the normal stretching operation.

When the head part 16 and the focus adjusting part 18 reach the position of the imaginary line in FIG. 1, the negative carrier loading part 26 is located within the reach of the worker, and the replacement of the negative carrier 34 can be performed while sitting on the chair 46. It will be.

Here, since the focus adjustment unit 18 is moved so as to follow the head unit 16 and is not corrected for focus adjustment, in this state, it may be out of focus when stopped at the negative carrier replacement position. For this reason, in this embodiment, when the negative carrier replacement switch 56 is operated, when the negative carrier replacement position is stopped, the position of the head portion 16 remains unchanged (without changing the magnification) and fine focus adjustment is performed. There is. This focus adjustment is calculated from the data at the time of setting the magnification, and a drive signal is sent to the pulse motor 22 based on this calculated value to move the focus adjustment unit 18. That is, since the data of the negative carrier replacement position is stored in the microcomputer 56 in advance, the focus adjustment can be completed earlier than the normal focus change and the focus adjustment movement at the same time. Further, the interval at the time of exchanging the negative carrier 34 can also be applied as this fine focus adjustment time.

The operation of this embodiment will be described below with reference to the flow chart of FIG.

First, when the negative carrier 34 is loaded into the negative carrier loading section 26 at step 100 (this detection may be performed by operating a predetermined key of the operation panel 50 after loading the negative carrier, or the negative gear rear loading section 26 may be provided with a limit switch, etc.). It may be provided and judged by the signal from the limit switch.), The process proceeds to step 102, and the position of the negative film 36 is confirmed. This is because a negative image is formed on the placement section 44 by turning on the halogen lamp 28 without placing the printing paper 52 on the placement section 44, so that the operator can easily check it.

When the position of the negative film 36 is confirmed, step 104
After that, the magnification is set by operating the keys of the operation panel 50, and then the number of prints is set in step 106. When these settings are completed, the photographic printing paper 52 is placed in the placement unit 44, and the process proceeds to Step 108 where the pulse motor 20 is driven based on the set magnification and the head unit starts moving. When driven, the focus adjusting unit 18 is moved at the same time as the head unit. At this time, the microcomputer 54 calculates the optimum focus at that time based on the continuously changing magnification, corrects the drive signal to the pulse motor 22, and moves the focus motor 22 always in focus.

In the next step 109, the exposure process is performed, and the image of the negative film 26 is formed on the photographic printing paper 52. When the exposure control is completed, the routine proceeds to step 110, where it is judged whether or not the preset number of sheets has been reached. If not, the routine proceeds to step 109 to continue the exposure processing. Also,
When the number of sheets reaches the predetermined number, the process proceeds to step 112, and it is determined whether or not the negative film exchange switch 56 on the operation panel 50 has been operated. Where the negative film replacement switch
If it is determined that 56 is not operated, step 11
It is continuously judged whether or not the process shifts to 4 and the exposure process is completed. When a negative determination is made in step 114, it is determined that exposure control is performed with the same image but different magnification settings, and the process proceeds to step 102 to repeat the above processing.
If the determination is affirmative, it is determined that the exposure processing has ended, and this routine ends.

Next, in step 112, when the negative film exchange switch 56 is operated, it is necessary to exchange the negative film 36 held in the negative gear rear 34 (including the movement of the sheet in the case of a sheet-shaped negative film). If it is determined that the head portion 16 is present, the process proceeds to step 116, and the head portion 16 is controlled to move to the negative film exchange position stored in advance in the ROM in the microcomputer 54. This negative film exchange position is the low magnification position shown by the imaginary line in FIG. When the head section 16 moves, the focus adjusting section 18 also moves at the same time, but the moving speed of the focus adjusting section 18 in this case is not corrected as described above, and the relative positions of the two are substantially the same as the head section 16. Moved unchanged. As a result, the head portion 16 and the focus adjusting portion 18 do not interfere with each other, and since there is no focus adjustment, it is possible to position the negative film at the negative film exchange position earlier than normal movement. Further, this positioning does not involve the exposure process, and therefore may be relatively rough. As a result, the worker 48 can reach the negative carrier loading section 26 while still sitting on the chair 46, and can quickly perform the replacement work.

As described above, when the negative film 36 is replaced, the head can be moved to a place where the operator can reach it (a low magnification position) at a speed faster than the normal speed regardless of the position of the head portion, so that the work efficiency is improved. improves.

When the replacement is completed in step 116, the normal exposure process is performed again.
The position of the negative film may be misaligned or out-of-focus because it is moved in accordance with the movement of the head portion 16 without correcting the movement of. If the head portion 16 is moved to the high-magnification position in this state and the negative position is confirmed, the workability deteriorates. Therefore, in this embodiment, in step 118, fine focus adjustment is performed after the negative film is exchanged in step 116. This fine focus adjustment has a fixed magnification and is a magnification stored in advance in the microcomputer 54. Therefore, the position correction value of the focus adjustment unit 18 can be easily calculated, and the amount of movement thereof is small, so that the fine adjustment can be performed quickly. Further, the interval at the time of exchanging the negative carrier 34 can also be applied as the fine adjustment time.

After the focus fine adjustment is performed, visually confirming the image formed on the arrangement portion 44 by the light beam from the halogen lamp 28,
Misalignment of the negative film 26 can be easily found.

When the focus fine adjustment in step 118 is completed, the process proceeds to step 102 and the normal processing is repeated.

〔The invention's effect〕

As described above, according to the head position moving method of the photo enlarger of the present invention, the head can be quickly moved to the predetermined position and the focus can be adjusted after the head is positioned to the predetermined position, and the work efficiency can be improved. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic view of a photographic enlarger to which the present invention can be applied, and FIG. 2 is a flow chart showing an exposure control routine of this embodiment. 10: Enlarger body, 16: Head section, 18: Focus adjustment section, 26: Negative carrier loading section, 34: Negative carrier,
36 …… Negative film, 54 …… Microcomputer, 56
...... Negative film exchange switch.

Claims (1)

(57) [Claims] 1. A film carrier in which an original image film is held is attached to a head provided with a light source and a lens, and the head and the original image are moved at the same time by moving the head in the optical axis direction based on a designated magnification. In the photographic enlarger, which changes the distance from the film to focus, and then forms an image on the photosensitive material at the predetermined magnification by the transmitted light that has passed through the original film, the head is focused when the original film is replaced. A method for moving the head position of a photographic enlarger, which comprises moving the lens in the optical axis direction to position it at a predetermined original film exchange position, and then performing focusing during the original image film exchange time.