JPH071376B2 - Film holder-moving device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a film holder moving device for trimming used in a photographic transmission device, a film scanner, or the like.

(Background of the Invention) Conventionally, in a photographic transmission device or the like that scans an optical image of a negative film or a positive film with a line sensor, converts it into an electric image signal, and transfers the electric image signal using a telephone line or the like, A film trimming device is used for picking up only a necessary portion at a required magnification for a film image. This is composed of a zoom lens and a moving device for the film holder. As the moving device for the film holder, conventionally, for example, a mechanism having a structure as shown in FIG. 8 is used.

In FIG. 8, reference numeral 1 denotes a film holder, on which a developed film 2 for performing photographic transmission or the like is mounted, and the film holder 1 is set in the illustrated moving device. Illumination light is emitted from the back side of the film 2, a zoom lens 12 is provided on the front surface of the film 2, and an image of the film 2 is projected at an arbitrary magnification within the scanning range of the line sensor.

The film holder moving device is necessary for projecting an arbitrary portion of the image of the film 2 on the scanning range of the line sensor. Then, the zoom lens and the film holder moving device make it possible to project an arbitrary portion of the film image and an arbitrary magnification in a constant scanning range of the line sensor, so that a so-called film trimming device is configured.

The film holder moving device is a Y stage that is movable in the Y-axis direction on a fixed stage 11 equipped with a zoom lens 12 behind it.
The stage 7 is mounted, the X stage 5 which is movable in the X axis direction is mounted on the Y stage 7, and the Z stage which is rotatable around the Z axis which is the optical axis direction is further mounted on the X stage 5.
With the structure in which the rotary plate 3 is mounted, the film holder 1 with the film 2 mounted on the Z rotary plate 3 is set as shown by the chain double-dashed line in order to move the film holder, and the optical finder (not shown) illuminates the light. While observing the film projection image by, the X stage 5 or the Y stage 7 is moved by the X movement knob 8 and the Y movement knob 9, and the Z rotation plate 3 is rotated by rotating the Z lock knob 4 around the optical axis. To do. Further, trimming is performed by performing a zoom trimming operation to adjust the projection magnification. When trimming is completed, Z lock knob 4, X
Each of the lock knob 6 and the Y lock knob 10 is rotated around their axes to be tightened and locked to the fixed stage 11,
Scanning scanning for photographic transmission or the like, that is, either the line sensor or the integrated film holder and zoom lens is moved for relative movement of the line sensor and the projected image of the film image. .

(Problems to be Solved by the Invention) However, in such a conventional film holder moving device, individual moving stages are used for moving in the X-axis and Y-axis directions and rotating about the Z-axis. Since the structure is complicated and the device becomes large and heavy, especially in the method of scanning the film side while fixing the line sensor as the scanning method,
It is difficult to directly adopt such a conventional film holder moving device because there is a problem in terms of a driving method for moving and scanning a film by a step motor or the like for scanning, positioning accuracy, and cost.

(Object of the Invention) The present invention has been made in view of such conventional problems, and has a simple mechanical structure, can be significantly reduced in weight, and is also inexpensive in terms of cost, and is a film holder moving device for trimming. The purpose is to provide.

(Summary of the Invention) In order to achieve this object, in the first invention, a film holder unit 20 including a film window 28 and a flat suction plate 22 made of an iron-based material, and a film holder unit 20. A suction part that is in contact with the suction part, a first magnetic part that generates a weak magnetic force in the mounting part, and a second magnetic part that generates a magnetic force stronger than the magnetic force of the first magnetic part in the mounting part Unit 30 and film holder unit 20
And a control unit that causes the second magnetic unit to work when it is fixedly held.

In the second invention, the film holder unit 20 including the film window 28, the flat attracting portion, and the first magnetic portion for generating a weak magnetic force at the attracting portion, and the attracting portion of the film holder unit 20 are provided. An adsorption unit 30 that is in contact with and is provided with an adsorption plate 22 formed of an iron-based material and a second magnetic unit that generates a magnetic force stronger than the magnetic force of the first magnetic unit in the mounting unit,
It has a control unit that activates the second magnetic unit when the film holder unit 20 is fixedly held.

For this reason, the flat surface (suction surface and mounting surface) where the film holder unit contacts the suction unit during trimming.
The film holder unit so that it can be moved with
The weak magnetic force of the magnetic portion makes it possible to adsorb, and after trimming, the magnetic force of the second magnetic portion makes it possible to firmly adsorb and fix the film holder unit so that it cannot move.

(Embodiment) FIG. 1 is an explanatory view showing an embodiment of the present invention.
The case of application to a film photographic transmission device or a film input scanner is taken as an example, and FIG. 2 shows a sectional view taken along the line AA of FIG.

In FIG. 1, reference numeral 43 is a base plate that constitutes a scanning portion of a film photographic transmission device or a film input scanner. A fixed block 41 is mounted on the base plate 43, and a cross linear structure is provided above and below the fixed block 41. Railway
42 is arranged, and the slider 40, which serves as the base member of the trimming device of the present invention, is mounted through the cross linear railway 42 while being precisely regulated in position. The slider is used as the base substrate of the trimming device because it is fixed and the film side is mechanically scanned to extract the projected image of the film.
40 is attached so as to be movable only in the left and right sub-scanning directions.

The driving of the slider 40 in the sub-scanning direction is performed by the step motor 44 mounted on the base plate 43. That is, the output shaft of the step motor 44 is connected via a universal joint 45 to a ball screw unit 48 whose both ends are supported by ball bearings (not shown).
A bearing 46 is screwed into the bearing 48, and the slider 40 is fixed to the bearing 46 with an L-shaped bearing mounting plate 47. Incidentally, 49 is a preload spring.

The slider 40 moved in the sub-scanning direction on the base plate 43 by the step motor 44 is provided with the film holder unit 20 via the suction ring unit 30 which will be described later.

FIG. 3 shows the film holder unit 20 of the present invention used in the embodiment of FIG. 1 and shows the suction surface side with respect to the suction ring unit 30, and FIG. 4 is a side view thereof.

That is, the film holder unit 20 has a pair of film holders 21a, 21a whose upper side opens and closes around the lower hinge 26.
b, and a film storage portion 25 is provided on both sides of one film holder 21b, and a pair of film holders 21a and 21b.
As shown in the figure, they are fitted together by an upper opening / closing lock plate 27 in a closed state, and hold the film pulled out from the film storing section 25 between the mating surfaces. Further, a rectangular film window 28 is opened at the center of the film holders 21a and 21b.

Further, on the surface of the film holder 21a located on the inner side, the suction ring unit is
The attracting plate 22 made of an iron-based material that receives a magnetic force from the side of 30 forms a magnetic circuit and is fixed with screws or by adhesion, and a rectangular film window 28 opened in the center of the attracting plate 22. A trimming ring 23 protruding inward is formed integrally with the portion.

Furthermore, in the film holder 21b located outside,
Operation knobs 24 for moving the film holder unit 20 at the time of trimming are fixed to three corners.

FIG. 5 shows the film holder unit 20 in FIG.
FIG. 6 is an explanatory view showing a suction ring unit 30 mounted on a slider 40 located behind the slider (see FIG. 2), and FIG. 6 shows a cross section taken along the line BB in FIG.

The suction ring unit 30 taken out and shown in FIG. 5 has a disk-shaped suction ring 31 made of an iron-based metal material, and the center of the suction ring 31 has a predetermined curvature (R) at the corner portion. There is a rectangular receiving hole 36 that takes the shape of
The curvature of the corner portion at 36 corresponds to the radius of the trimming ring 23 of the film holder unit 20 shown in FIG. Further, as is clear from the sectional view of FIG. 6, the suction ring 31 has a suction plate 22 of the film holder unit 20.
A rubber magnet 34 as a permanent magnet is fitted into the annular groove 32 opened on the attracting surface for receiving one surface so that one surface is exposed to serve as the attracting surface, and further the annular groove behind the rubber magnet 34.
An electromagnet 33 is incorporated in 32, and an exciting current can be made to flow to the electromagnet 33 by a lead wire 35 drawn to the outside.

As shown in FIGS. 1 and 2, the suction ring unit 30 shown in FIGS. 5 and 6 is mounted on a slider 40 which is moved by a step motor 44 in a sub scanning direction (left and right direction in the drawing) with respect to a base plate 43. The film holder unit 20 shown in FIGS. 3 and 4 is attached to the attraction surface which is the front surface of the attraction ring unit 30 assembled to the slider 40, with the mounting surface side of the rubber magnet 34 facing outward. Receiving hole for suction ring unit 30
The trimming ring 23 on the film holder side is fitted into the film 36, and the rubber magnet 34 is held by attraction by forming a magnetic circuit on the attraction plate 22 on the film holder side.

Referring again to FIG. 1, a pair of microswitches 50 and 51 are mounted on the left and right positions of the base plate 43, and movement of the slider 40 by the step motor 44 activates one of the microswitches 50 and 51. When moved to the position, the micro switch 50 or 51 detects the movement of the slider 40 and can stop or reverse the rotation of the step motor 44.

Further, as shown in the upper part of FIG. 2, the lead wire 35 drawn out from the electromagnet 33 built in the suction ring 31 is drawn by a lead wire guide 52 into an energization circuit of an electromagnet (not shown).

Next, the operation of moving the film holder for the trimming operation according to the above embodiment will be described.

First, the suction plate 22 side of the film holder unit 20 is attached to the slider 40 in a state in which the film already photographed is set in the film storage unit 25 of the film holder unit 20 taken out and shown in FIGS. 6 Attach to the suction ring unit 20 shown in FIG. When attaching the film holder unit 20 to the suction ring unit 20,
The trimming ring 23 provided so as to protrude inward from the suction plate 22 of the film holder 21a is fitted into the receiving hole 36 formed at the center of the suction ring 31 so as to be fitted therein. When the film holder unit 20 is attached to the suction ring unit 30 as described above, the suction plate 22 of the film holder unit 20 by the rubber magnet 34 provided in the suction ring unit 30 is attached.
The film holder unit 20 can be adsorbed and held with a strength such that it can be trimmed and moved with respect to the slider 40.

Next, trimming is required by changing the zoom magnification while viewing the projected image of the film with an optical finder (not shown), and further by operating the operation knob 24 of the film holder unit 20 with both hands to move the film holder unit 20 up, down, left, right or rotationally. Trimming work is performed to pick up the film optical image of only the necessary part at various magnifications.

As shown in FIG. 8, the trimming range at this time is such that the trimming ring 23 of the film holder unit 20 is fitted into the receiving hole 36 provided in the suction ring unit 30, so that the trimming range is set in the receiving hole 36. It is possible to move the film holder unit 20 within one plane for trimming within a range in which the ring 23 can be moved, that is, ± X (horizontal direction) and ± Y (vertical direction) and around the Z axis which is the optical axis direction. it can.

Further, during the trimming operation, the exciting current is not applied to the electromagnet 33 built in the attraction ring unit 30, and the film holder unit 20 is attracted and held only by the magnetic force of the rubber magnet 34. The film holder unit 20 is set to such an extent that it can freely move on the attraction surface of the attraction ring 31 against the attraction force of the rubber magnet 34 while maintaining the attraction state.

On the other hand, when the trimming work is completed, a predetermined exciting current is applied to the electromagnet 33 incorporated in the adsorption ring unit 30 to operate as an electromagnet, and a magnetic force is generated by the energization of the electromagnet 33 in addition to the magnetic force by the rubber magnet 34. The film holder unit 20 that has been trimmed with even stronger force
Is fixed by adsorption. Therefore, during the scanning operation accompanying the driving of the step motor 44 performed after the end of trimming, the film holder unit 20 is attracted and locked by the electromagnetic force generated by energizing the electromagnet 33 with a strong force, so that the slider 40 is The film holder unit 20 can be integrally scanned and moved in the sub-scanning direction.

It should be noted that in the above embodiment, the film holder unit is made only by the rubber magnet 34 without energizing the electromagnet 33 built in the suction ring unit during the trimming work.
Although 20 is adsorbed and held, in order to remove the variation in the adsorbing force due to the rubber magnet 34, it is possible to supply a small exciting current to the electromagnet 33 even during trimming.

Further, in the embodiment, the permanent magnet (rubber magnet 34) and the electromagnet (3
3) and 3) are assembled into the suction ring unit 30 and fixed to the slider 40 by screwing, but a permanent magnet may be assembled into the suction plate 22 of the film holder unit 20. It is not impossible to incorporate the electromagnet 33 into the film holder unit 20, but it is not preferable because the operation for holding the film is difficult because the lead wire is laid around.

In the above embodiment, the scanning method of moving the film side in the sub-scanning direction with respect to the fixedly arranged line sensor was taken as an example, but the present invention is not limited to this.
The trimming device of the present invention can be applied in the same manner to a system in which the film side is fixed and the line sensor side is mechanically scanned in the sub-scanning direction.

(Effect of the Invention) As described above, according to the present invention, a flat attracting portion of an iron-based material, a flat mounting portion, a first magnetic portion that generates a weak magnetic force, and a first magnetic portion of the first magnetic portion. Since the second magnetic unit that generates a magnetic force stronger than the magnetic force and the control unit that activates the second magnetic unit are provided, the flat mounting unit and the flat adsorption unit adsorb with a weak magnetic force, and the film holder unit is attached. It can be moved in any direction and the film can be trimmed freely. Then, when the film image is read (during scanning) after the trimming is completed, the second magnetic portion is operated to firmly adsorb and fix the film holder unit by the strong magnetic force so that it cannot be moved.

Therefore, as compared with a trimming device that conventionally trims a film by a moving stage that moves in the XY directions, the structure is simple and downsized, and the weight can be significantly reduced, and the device cost can be reduced. You can also

Further, in a photographic transmission device, a film scanner, or the like, the suction portion may be arranged in the film holder unit and the first magnetic portion may be arranged in the suction unit, or vice versa, for convenience of use. You may make it arrange | position 1 magnetic part in a film holder unit, and arrange | position an adsorption | suction part in an adsorption | suction unit.

[Brief description of drawings]

1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an illustration showing a film holder unit in the embodiment shown in FIG. Figure, 4th
3 is a side view of FIG. 3, FIG. 5 is an explanatory view showing the suction ring unit in the embodiment of FIG. 1 taken out, FIG. 6 is a sectional view taken along line BB of FIG. 5, and FIG. FIG. 8 is an explanatory view schematically showing a trimming range in the invention, and FIG. 8 is an explanatory view showing a conventional device. 2: Film 20: Film holder unit 21a, 21b: Film holder 22: Suction plate 23: Trimming ring 24: Operation knob 25: Film storage part 26: Hinge 27: Open / close lock plate 28: Film window 30: Suction ring unit 31: Adsorption ring 32: Annular groove 33: Electromagnet 34: Rubber magnet 35: Lead wire 36: Receiving hole 40: Slider 41: Fixed block 42: Cross linear railway 43: Base plate 44: Step motor 45: Universal joint 46: Bearing 47 : Bearing mounting plate 48: Ball screw 49: Preload spring 50, 51: Micro switch 52: Lead wire guide

Claims (3)

[Claims] 1. A film holder moving device for moving a film so that it can be trimmed, wherein a film holder unit having an opening and a flat suction portion formed of an iron-based material, and a suction portion of the film holder unit. An adsorption unit including a flat mounting portion in contact with the mounting portion, a first magnetic portion for generating a weak magnetic force in the mounting portion, and a second magnetic portion for generating a magnetic force stronger than the magnetic force of the first magnetic portion in the mounting portion. A film holder moving device having a control unit that activates the second magnetic unit when the film holder unit is fixedly held. 2. A film holder moving device for moving a film so that it can be trimmed, a film holder unit having an opening, a flat attracting portion, and a first magnetic portion for generating a weak magnetic force at the attracting portion. An adsorption unit including a flat mounting portion that is in contact with the adsorption portion of the film holder unit and is formed of an iron-based material, and a second magnetic portion that generates a magnetic force stronger than the magnetic force of the first magnetic portion in the mounting portion. A film holder moving device comprising: a control unit that operates the second magnetic unit when the film holder unit is fixedly held. 3. The first magnetic unit is a permanent magnet, the second magnetic unit is an electromagnet, and the control unit is an energizing circuit for energizing the electromagnet. The film holder moving device according to item 2 or item 3.