JPH0566483A - Film holding apparatus - Google Patents

Abstract

PURPOSE:To prevent a film from causing the shape change of warping, etc., in a film loaded state, in a film apparatus holding a 35mm negative film. CONSTITUTION:In the film apparatus 11 composed of a fixing plate 12 and an opening/closing plate 13, projections 16a, 16b..., out of the projections 15a, 15b... and 16a, 16b..., on two rows, fitted into the perforations of the film F provided on the fixing plate 12, are disposed on a sliding plate 16 so as to move in the transverse direction of the film, and when the opening/closing plate 13 is closed at the time of loading the film F, plate springs 18a and 18b provided on the opening/closing plate 13 are abutted on projecting parts 17a and 17b provided on the sliding plate 16, so that the sliding plate 16 is moved and the film F has tension in its width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film holding device which is inserted into an image reading device while holding a negative film and reads the image of the negative film.

[0002]

2. Description of the Related Art A conventional film holding device is shown in FIG.
That is, in the figure, the film holding device main body 1 has a fixed plate 2 whose edges are supported by a hinge shaft 4 so as to be openable and closable.
A guide 5 for positioning the widthwise end faces of the film F on both sides of the fixed plate 2 in the longitudinal direction.
a, 5b ... And 6a, 6b .. are projected for each opening, and a guide 7 for positioning the end face in the longitudinal direction is also projected. And in a normal image reading device,
Focus adjustment is performed by means such as moving the projection lens system in a direction along the optical axis so that an image is correctly formed on a sensor surface such as a CCD for reading an image. A device for automatically performing the focus adjustment is also known.

[0003]

By the way, in the above-mentioned conventional example, there is no regulation means for the optical axis direction near the center of the read image in one frame of the negative film. Further, it is known that the film has a property that a shape change such as a warp occurs due to a thermal influence of a light source. As a result, in the vicinity of the center of the read image of the film, deviation in the optical axis direction occurs, and when the amount becomes larger than the depth of focus of the lens system, correct focus cannot be obtained and it is necessary to perform focus adjustment again. there were. There is also a method in which both sides of the film are sandwiched by a transparent member such as glass so as to prevent the deviation in the optical axis direction near the center of the film, but there is a drawback that Newton's rings appear on the image.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional example and to provide a film holding device which does not cause a warp or the like of the film when the film is mounted.

[0005]

In order to achieve the above-mentioned object, the present invention provides a film holding device for holding a 35 mm negative film, wherein a plurality of projections are fitted to two continuous rows of perforations provided on the film. Is provided
A means is provided for urging these projections so that the film can be tensioned in the width direction when the film is mounted.

[0006]

In the film holding device having the above-described structure, the film is tensioned in the width direction by the urging force of the projections, so that the shape change such as the film warp is reduced, and the focus is adjusted once when the image reading device is attached. After that, the image can be read without readjustment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. 11 is a film holding device body,
It is composed of a fixed plate 12 and an open / close plate 13 whose edges are supported by a hinge shaft 14 so as to be openable and closable. 15a, 15b,
Denoted at 15c are fixing protrusions provided on one side of the fixing plate 12, and their shapes and intervals are formed so that they can be inserted into a part of the perforations on one side provided on the sleeve-shaped 35 mm film F. 16a, 16b, 16c ... are slide plates 1 movable in the arrow direction (width direction of the film F).
6 is a movable protrusion provided on the fixed protrusions 15a, 15b,
15c is provided on the other side of the fixed plate 12 at a position opposed thereto, and can be inserted into the perforation on the other side of the film F. Further, projections 17a and 17b are provided on both ends of the slide plate 16, respectively. 18a, 18
Reference numeral b is a leaf spring provided on the opening / closing plate 13 at a position facing the protrusions 17a and 17b, respectively, and when the opening / closing plate 13 is closed, its tip end abuts on the protrusions 17a and 17b, and the slide plate 16 is indicated by an arrow in the figure. Energize to move downward.

In this embodiment having the above-described structure, a part of the perforation on one side of the film F is fixed to the fixing projection 1 of the fixing plate 12 with the opening / closing plate 13 opened as shown in FIG.
5a, 15b, 15c, ... Then, part of the perforation on the other side is moved to the movable projections 16a, 16b, 1
6c ... Therefore, when the opening / closing plate 13 is closed as shown in FIG. 3, the protrusions 17 a, 17 of the slide plate 16 are
b contacts the leaf springs 18a and 18b, and the slide plate 16 is biased in the direction of the arrow by the leaf springs 18a and 18b. As a result, the film F is given a tension to reduce warpage and the like.

4 to 6 show a second embodiment of the present invention. For simplification of description, the same parts as those in the first embodiment are designated by the same reference numerals, and only different points will be described. In the first embodiment, the leaf spring for urging the slide plate 16 is provided on the opening / closing plate 13 side.
It is provided on the second side. That is, in the present embodiment, the protrusions 17a, 17b are located at the positions of the protrusions 17a, 17b of the fixed plate 12.
One end of each of the mountain-shaped leaf springs 21a and 21b for biasing 17b is fixed by screws 22a and 22b, respectively, and the other end near the protrusion is freed. When the opening / closing plate 13 is opened, the leaf springs 21a and 21b Each free end has a protrusion 1
It is slightly separated from 7a and 17b. The other structure is similar to that of the first embodiment.

In this embodiment having the above-mentioned structure, after the opening / closing plate 13 is opened as shown in FIG. 5, a film (not shown) is mounted in the same manner as in the first embodiment, and then the opening / closing plate is opened as shown in FIG. When 13 is closed, the mountain-shaped portions of the leaf springs 21a and 21b are pushed and urged by the opening / closing plate 13 and, as a result, the free ends of the leaf springs 21a and 21b are projected.
The slide plate 16 is urged in the arrow direction (film width direction) by contacting the a and 17b. Therefore, the film F is tensioned.

[0011]

As described above, the present invention is 35 mm.
By mounting a plurality of projections that fit into two continuous perforations provided on the film, and by providing a means for urging these projections so that the film is tensioned in the width direction when the film is mounted, the film mounting At the same time, it is possible to reduce the warp of the film due to heat from the light source or the like, so that after focus adjustment, image reading can be performed without readjustment.

[Brief description of drawings]

FIG. 1 is a perspective view of a film holding device according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the film mounting procedure.

FIG. 3 is an enlarged cross-sectional view showing a state where the film is mounted.

FIG. 4 is a perspective view of a film holding device according to a second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view before mounting the film.

FIG. 6 is an enlarged cross-sectional view of the state in which the film is mounted.

FIG. 7 is a perspective view of a conventional film holding device.

[Explanation of symbols]

F ... 35mm negative film, 11 ... Film holding device body, 12 ... Fixing plate, 13 ... Opening / closing plate, 14 ... Hinge shaft, 15a, 15b, 15c ... Fixing guide, 16
..Sliding plates, 16a, 16b, 16c .. Movable protrusions, 17a, 17b .. Projections, 18a, 18b .. Leaf springs, 21a, 21b ..

Claims (1)

[Claims] 1. A film holding device for holding a 35 mm negative film, wherein a plurality of projections fitted to two continuous rows of perforations provided on the film are provided.
A film holding device, wherein at least one row of these projections is provided with a means for urging the film so as to apply tension in the width direction when the film is mounted.