JP2744891B2 - Photographic film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film, and more particularly to a roll film having a hole.

[0002]

2. Description of the Related Art A conventional perforated photographic film such as a 35 mm photographic film is provided with perforations at regular intervals near both side edges of the film. The perforation pitch is, for example, about 4.7 for a 35 mm film.
Originally, it was provided so as to feed a movie film by engaging a ratchet of a movie projector with perforations.

Further, in a still camera, a nail wheel is meshed with a perforation to detect a feed amount of a film, and a feed amount for each frame is controlled to be constant. In a reversal film, for example, an image is shot on a black background. The edge of the screen and the gap between the screens are similarly developed in black, so when cutting the developed reversal film frame by frame, the boundary between the edge of the screen and the gap between the screens is determined. It's not easy. And, since the gap is set to be located almost at the middle of the perforations aligned at a small pitch in the feed direction of the perforated roll film, there is no target for the cutting position, and the cutting position is incorrect. There is a risk that the screen may be damaged, and that handling requires care.

In order to facilitate the determination of the cutting position when cutting the developed film frame by frame and to improve the handleability, the applicant of the present invention has already set the perforation of the roll film to the gap between photographed images. And a photographic film (Japanese Patent Application No. 6-108803) in which the perforations are elongated in the direction of film feed. In this photographic film, the pitch of the perforations is set equal to the pitch of the shooting screen of the camera, and by using the camera with a film feed mechanism designed so that the perforations are located in the gaps between the shooting screens, It is the target of the film cutting position.

The applicant of the present application has also proposed a slide mount (Japanese Patent Application No. 6-092635) suitable for mounting a photographic film having the above-mentioned shape. In this slide mount, positioning pins are provided upright at four corners of a film table portion of a mount frame. The positioning pins are formed to have an outer diameter capable of engaging with the above-described photographic film perforations, and the vertical and horizontal pitches are formed to be equal to the perforation pitches of the photographic film. Therefore, if the photographic film cut into one frame is placed on the film table and the film holding cover is fitted to the mount frame, the perforations at the four corners of the cut photographic film engage with the positioning pins, and Are accurately positioned and mounted.

[0006]

By arranging the perforations of the photographic film in the gaps between the photographic screens, the possibility of erroneous cutting positions when cutting the photographic film frame by frame is substantially eliminated. However, if the width of the gap between the shooting screens is set as narrow as possible to reduce the loss of photographic film, if the cutting position is determined within the range before and after perforation, the edge of the screen will be reduced. There is a risk of cutting. Therefore, if there is a more accurate target of the cutting position, handling is further facilitated.

Therefore, there arises a technical problem to be solved in order to facilitate the film cutting work by accurately cutting the central position before and after the perforation, and the present invention solves the above problem. With the goal.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above-mentioned object. Perforations at regular intervals are respectively arranged near the upper and lower side edges of a roll film so as to be vertically symmetrical in the longitudinal direction. And, in a photographic film in which the perforations are arranged in gaps between photographing screens, the perforations are oval extending in the feed direction of the photographic film, and have V-shaped grooves at the front and rear central portions of both upper and lower sides. A photographic film characterized by being formed, and the perforation is displaced in a feeding direction of the photographic film, and is an eccentric double circle constituted by a pair of partially overlapping circular holes. , And the perforations are displaced in a photographic film feed direction, and are constituted by a pair of circular holes partially overlapping. Heart is a double circle, and is to provide a photographic film, characterized in that the formation of the V-shaped groove around the central portion of the upper and lower sides.

[0009]

In the photographic film of the present invention, a V-shaped groove or a V-shaped projection is provided at the front and rear central portions of the perforations arranged so as to be located in the gap between the photographing screens. Therefore, if the photographic film is cut with the top of each V-shaped groove or V-shaped projection of the upper and lower perforations as the target of the cutting position, it is possible to cut exactly at the center of the gap.

In the photographic film according to the second and third aspects, the perforation of the photographic film cut at the center before and after the perforation has a shape obtained by cutting a part of a circle, and the opening is smaller than the diameter of the perforation. Shape. Thus, the slide mount by the present applicant has proposed (Japanese Patent Application Rights 6-092635
When the perforations are fitted to the positioning pins of (1), the photographic film does not come off from the positioning pins, and the slide mount can be easily assembled.

Further, when the photographic film according to the third aspect is cut at the front and rear center of the perforation, the perforation has a shape to be fitted to the positioning pin of the slide mount similarly to the photographic film according to the second aspect. Since the opening is widened, positioning and press-fitting when the positioning pin is press-fitted into the perforation can be easily performed.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a photographic film 1 according to the present invention. For example, a perforation 2 is provided near the upper and lower edges of a photographic film 1 having a width of 35 mm. The camera using the photographic film 1 sets the exposure position so that the photographing screen is located in the middle of the upper, lower, left and right perforations 2 as shown in FIG.
Is designed to be equal to the pitch P. Then, by using the camera designed in this way, the upper and lower perforations 2 become marks of the cutting line.

The perforation 2 is a photographic film 1
The V-shaped grooves 3 are formed on both the upper and lower sides of an oval extending in the feeding direction, and the intermediate portion is widened. The diameter D of the rounded portions at the front and rear ends is set equal to the diameter of the positioning pin 5 of the slide mount 4 shown in FIG.

[0014] slide mount 4 shown in FIG. 2 are those present applicant described above is pending (Japanese Patent Application flat No. 6-092635), and perforations 2 of the photographic film 1 at four corners of the window 6 of the mount frame 5 Cylindrical positioning pins 7 are provided upright at the same pitch, and a hole 9 for fitting the positioning pins 7 is provided in the film holding cover 8.

In the photographic film 1 shown in FIG. 1, since the apex of the V-shaped groove 3 at the front and back of the perforation 2 is located at the center of the gap G between the photographed images, the V-shaped grooves 3 of the upper and lower perforations 2 are respectively. Is cut as a target of the cutting position, the center of the gap G can be cut accurately.

When the photographic film 1 cut into one frame is mounted on the slide mount 4 shown in FIG.
The perforations 2 are engaged with the positioning pins 7 to automatically determine the upper, lower, left, and right positions of the photographic film 1, and are fixed at an accurate position with respect to the window 6 of the slide mount 4.

The shape of the V-shaped groove 3 to be cut is:
As shown in FIG. 3, it may be constituted by tangent lines of the rounded portions at the front and rear ends, and the whole may be rhombic. Although not shown, the perforation 2 may be provided with a V-shaped groove 3 on one of the upper and lower sides.

FIG. 4 shows a photographic film 11 according to a second aspect of the present invention.
Has an eccentric double circle that is long in the film feed direction, and a substantially V-shaped convex portion 13 is formed at the front and rear central portions of both upper and lower sides. Therefore, by cutting with the target being a straight line connecting the vertices of the protrusions 13 of the upper and lower perforations 12, the film is cut at the center of the gap G in the same manner as the photographic film 1 of the first aspect. The opening width of the perforations 12 of the cut photographic film 11 is smaller than the diameter of the positioning pins 7 of the slide mount 4 shown in FIG.
When the curled photographic film 11 is placed on the slide mount 4 and the upper surface of the photographic film 11 is pressed, the positioning pins 7 are pressed into the perforations 12 as shown in FIG. And the perforations 12 are fitted together, and the photographic film 11 is fixed to the slide mount 4. Therefore, the subsequent mounting of the film pressing cover 8 can be performed very easily.

FIG. 6 shows a modified example of the photographic film 11 according to the second aspect, in which the apex of the V-shaped convex portion 13 is formed flat, and the film feed claw of the camera is more than that shown in FIG. There is an advantage that the possibility of interference with the projection 13 is small.

FIG. 7 shows a photographic film 21 according to the third aspect, wherein the perforations 22 are eccentric double circular holes long in the film feed direction, and V-shaped grooves 23 are provided in the front and rear central portions of both upper and lower sides. I have. The photographic film 21 is cut at the center of the gap G by cutting the line connecting the vertices of the V-shaped grooves 23 of the upper and lower perforations 22.

Since the opening of the perforation 22 of the cut photographic film 21 is cut at the center of the V-shaped groove 23, the opening becomes an expanded shape, and the perforation 22 is fitted to the positioning pin 7 of the slide mount 4 as shown in FIG. At this time, the opening functions as an insertion guide, and the photographic film 21 can be easily mounted.

[0022]

According to the present invention, as described in detail in the above embodiment, the V provided at the intermediate portion before and after perforation is provided.
Since the groove or the V-shaped protrusion is the target of the cutting position, the photographic film can be cut accurately and easily, and the handleability is improved.

Further, in the inventions according to the second and third aspects, the perforations are shaped to be fitted and fixed to the positioning pins of the slide mount, so that the workability when mounting the slide mount on the slide mount is remarkable. improves.

Further, according to the third aspect of the present invention, since the perforation opening of the cut photographic film is widened, it is easy to fit the perforation and the positioning pin, and the slide making operation is further efficiently performed. I can do it.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the invention according to claim 1, wherein (a)
Is a front view of the photographic film, and (b) is an enlarged view of perforation.

FIG. 2 is an exploded perspective view of a slide mount suitable for the photographic film of the present invention.

FIG. 3 is an enlarged view of a perforation showing another embodiment of the invention described in claim 1.

FIG. 4 shows an embodiment of the invention described in claim 2, wherein (a)
Is a front view of the photographic film, and (b) is an enlarged view of perforation.

FIG. 5 is a front view of an essential part showing an engaged state between the photographic film shown in FIG. 4 and the slide mount shown in FIG. 2;

FIG. 6 is an enlarged view of a perforation showing another embodiment of the invention described in claim 2;

FIG. 7 shows an embodiment of the invention according to claim 3, wherein (a)
Is a front view of the photographic film, and (b) is an enlarged view of perforation.

8 is an essential part front view showing an engagement state between the photographic film shown in FIG. 7 and the slide mount shown in FIG. 2;

[Description of Signs] 1,11,21 Photographic film 2,12,22 Perforation 3,23 V-shaped groove 4 Slide mount 5 Mount frame 7 Positioning pin 8 Film press cover 13 Convex part G Gap part

Claims (3)

(57) [Claims] 1. A photographic film in which perforations at regular intervals are arranged in the longitudinal direction symmetrically in the vicinity of both upper and lower side edges of a roll film, and the perforations are arranged in a gap between photographing screens. A photographic film, wherein the perforations are oval extending in the direction of feeding the photographic film, and V-shaped grooves are formed in the front and rear central portions of both upper and lower sides. 2. A photographic film in which perforations at equal intervals are vertically arranged symmetrically in the longitudinal direction in the vicinity of both upper and lower side edges of a roll film, and the perforations are arranged in a gap between photographed images. The photographic film is characterized in that the perforations are displaced in the feed direction of the photographic film and are eccentric double circles formed by a pair of partially overlapping circular holes. 3. A photographic film in which perforations at equal intervals are vertically arranged symmetrically in the longitudinal direction in the vicinity of both upper and lower side edges of a roll film, and the perforations are arranged in a gap between photographing screens. The perforation is displaced in the photographic film feed direction, and is an eccentric double circle constituted by a pair of partially overlapped circular holes, and a V-shaped groove is formed in the front and rear central portions of both upper and lower sides. Characteristic photographic film.