JP2753165B2 - Photo film package - 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 package in which a photographic film in the form of a sheet is housed in a light-shielding envelope so as to be freely taken in and out.

[0002]

2. Description of the Related Art A relatively large size (for example, 12.5
(X10 cm) sheet-shaped photo film, a film unit comprising a carrier sheet fixed to the rear end of the photo film in a detachable manner and having the other end fixed with a clip, and an insertion port closed with the clip, A photographic film package composed of a light-tight envelope for storing a photographic film in a light-tight manner has been proposed in the specification of US Pat. No. 4,821,054 and Japanese Patent Application No. 2-411154.

The photographic film package is used by being loaded into a film holder mounted behind a camera.
When loading, operate the lock lever of the film holder and set it to the unlocked position. In this state,
Insert the photo film package into the film holder,
When the lock lever is set to the lock position, the clip is clawed at the open end and locked to the film holder.
Thereafter, when the light-shielding envelope is picked and pulled out, the engagement between the clip and the light-shielding envelope is released, and the clip is exposed from the insertion opening to enable photographing. Then, when the light-shielding envelope is pushed into the film holder after the photographing, the insertion opening is closed by the clip, and the exposed photographic film is stored in the light-tight envelope in a light-tight manner. After the storage, the lock lever is set to the unlock position, and the light-shielding envelope is pulled out again to take out the photo film package from the film holder. . By the way, when you pull out the shading envelope and pull out the photo film,
In the photo film package, the clip is crimped by applying force from one side to firmly fix the clip to the carrier sheet. As shown in FIG. 5, one of the swaged shapes formed on the clip 7 is flat, and the other is a projection 7a. As shown in FIG. 6, one is a projection 7a and the other is a recess 7b.

[0004]

However, when crimping with the above-mentioned conventional photo film package,
Since the opening end of the clip is deformed so as to be narrowed, the clip may not be able to be nailed to the film holder.
Also, if the caulking shape is as shown in FIGS. 5 and 6, strong adhesion cannot be secured, so that when the light-shielding envelope is pulled out, the carrier sheet comes off from the clip, and the photographic film is also pulled out from the film holder. There was also a fear that. SUMMARY OF THE INVENTION It is an object of the present invention to provide a photographic film package in which the clip and the carrier sheet are firmly fixed without deforming the open end of the clip.

[0005]

In order to achieve the above object, according to the present invention, the clip is crimped from both outer surfaces of the clip so that projections are formed on both contact surfaces of the clip which contact both surfaces of the carrier sheet. These are fixed. In the invention of claim 2, the opening degree of the clip tip is equal to each other at both ends, and is set equal to or wider than the both ends at the center, and the portions sandwiched between the center and both ends are equal to each other. , And are set to be equal to or narrower than both ends. Furthermore, in the invention according to claim 3, the clip is symmetrical except for the central portion of the clip.

[0006]

FIG. 3 shows a photographic film package according to the present invention. A photographic film package 2 is used by being loaded into a camera film holder (see, for example, US Pat. No. 4,821,054). The photo film package 2 comprises a film unit 3 and a light-shielding envelope 4 for accommodating the same. A first carrier sheet 6 made of black polyester film is joined to the lower surface of the left end portion of the photo film 5 in a sheet form constituting the film unit 3 via a hot melt. This first carrier sheet 6
A clip 7 is caulked at the opposite end. Further, when the photographic film 5 is bonded, the first carrier sheet 6 is formed with holes 8 for discriminating the front and back sides so that the photographic film 5 can be securely bonded not to the lower surface but to the upper surface.

The relationship between the thickness of the first carrier sheet 6 and the caulking strength is, for example, that when the thickness is 50 μm, the strength is 3 kg or less, and when the thickness is 188 μm, the strength is 7 kg or more. . By the way, when the thickness of the first carrier sheet 6 is large, a step difference from the photo film 5 becomes large, and a problem occurs when the light shielding envelope 4 is taken in and out. Therefore, in this embodiment, the thickness of the first carrier sheet 6 is set to 10
0 μm, but the thickness is 80 μm to 150 μm
It may be. Further, if the first carrier sheet 6 is transparent, external light may enter the light-shielding envelope by light piping. Therefore, the first carrier sheet 6 is made black, but other colors may be used.

In FIG. 1 showing the clip, the clip 7 has a main body 10 and a pair of bent pieces 1 integrally formed of a cold-rolled steel sheet having a thickness of 0.15 mm and a surface painted black.
1a and 11b, and has a bell shape as a whole. The main body 10 is U-shaped, and is caulked from both outer surfaces in a state where the first carrier sheet 6 is wrapped in a sandwich shape. Therefore, the first carrier sheet 6
Projections 10a are formed on both contact surfaces of the main body 10 that comes into contact with the main body. These projections 10a can bite into both surfaces of the first carrier sheet 6 to make the fixing firm, for example, a caulking strength of 5.5 kg. The protrusions 10a are formed so as to avoid both ends and the center of the clip 7,
The number is 8 on one side and 16 in total. The eight projections 10a formed on one side are symmetrical with respect to the center, for example, at a distance of D ₂ (D ₂ = 8 mm) from a position D ₁ (D ₁ = 11.7 mm) away from the center. Figure 4
As shown in FIG. Incidentally, at the end of the clip 7, D ₃ as the bent piece 11a, the tip of 11b not narrowed is set to 20 mm. In this embodiment, the thickness of the clip 7 is set to 0.15 mm.
It may be in the range of 10 mm to 0.20 mm. Before applying the black coating, zinc plating of 20 μm on both sides may be performed.

The light-shielding envelope 4 is fitted between the bent pieces 11a and 11b in the direction of the arrow shown in FIG. An opening 12 is formed at the left end portion of the light-shielding envelope 4, but the inside of the light-shielding envelope 4 is kept light-tight by being fitted to the bent pieces 11a and 11b. By the way, when the light-shielding envelope 4 is fitted to the clip 7, the opening 12 of the light-shielding envelope 4 swells at the central portion, and there is a problem that the opening cannot be carried out smoothly. As shown in FIG. In this figure, the positions of both ends are A and B, the position of the center is C, the positions A and C, and the intermediate positions between the positions B and C are D and E, respectively, and the folding at each of the positions A to E is performed. The operability when fitting the light-shielding envelope 4 to the clips X to Z in which the degree of opening at the ends of the bent pieces 11a and 11b was adjusted was examined. The experimental example is shown in Table 1 below. The thickness of the first carrier sheet 6 is 100
μm, and the thickness of the light-shielding envelope is the thickest on both sides and 700 μm at the maximum.

[0010]

[Table 1]

From the results of the experiment, it was found that the dimensions at positions A, B and C are particularly important, and that when A = B = C <2.1 mm, the light-shielding envelope 4 cannot be fitted to the clip 7. Further, as can be seen from Table 1, it was found that the light-shielding envelope 4 could not be fitted to the clip 7 even when A = B> C. The preferred dimensions at each of the positions AE derived by experiment are D = E ≦ A = B ≦ C.

On the lower surface of the right end of the photo film 5,
The second carrier sheet 14 is joined via a hot melt as shown in FIG. This second carrier sheet 1
4 has a trapezoidal cut at the opposite end, and slits 15 and 16 having different widths are formed at this end. Further, a rectangular step correction sheet 17 is joined to the upper surface of the second carrier sheet 14. The step correction sheet 17 is arranged between the photo film 5 and the slit 15, and the slit side end is cut obliquely. For this reason, the slide when covering the film unit 3 with the light-shielding envelope 4 after the photographing is completed can be easily performed. For the same reason, the end of the first carrier sheet 6 on the photographic film side is also cut diagonally.

The light-shielding envelope 4 includes a second carrier sheet 14.
The tip portion has a trapezoidal shape corresponding to the tip shape of. When the photographic film package 2 is loaded into the camera, the leading end protrudes from the film holder, and thus a reinforcing cardboard 18 is adhered to this portion. A notch 19 is formed at the center of the cardboard 18 so that the film unit 3 can be pulled out together with the light-shielding envelope 4 when the photographic film package 2 is taken out after photographing. Further, a stopper tape 20 for regulating the position in the film holder is joined along the opening end of the light-shielding envelope 4. The light-shielding envelope 4 is made of black paper mixed with carbon in order to obtain light-shielding properties. The outer surface of the envelope 4 is subjected to a moisture-proof treatment, and the inner surface is smoothly finished.

The operation of the thus configured photo film package 2 will be described. In the photo film package 2, as shown in FIG. 4, the opening end of the light-shielding envelope 4 is fitted to the clip 7, and the opening 12 is closed. The photo film package 2 is loaded in a film holder.
At the time of loading, the film holder is set in the unlocked state, and the clip 7 is inserted into the film holder with the clip 7 at the top. After this insertion, the clip 7 is set in a locked state and the clip 7 is locked to the film holder.

In this state, the leading end of the light-shielding envelope 4 is
When the finger 8 is lightly pinched and pulled from above, the film unit 3 is also pulled to the right in the figure together with the light-shielding envelope 4. At this time, the locked clip 7 is attached to the first carrier sheet 6.
3 and the bent ends 11a and 11b are disengaged from each other, and only the light-shielding envelope 4 moves to the position shown in FIG. It is exposed from the light-shielding envelope 4 and can be photographed.

When the light-shielding envelope 4 is pinched and pushed with a finger after photographing, the film unit 3 is stored in the light-shielding envelope 4 as shown in FIG. When the light-shielding envelope 4 is further pushed in, the opening end of the light-shielding envelope 4 is fitted into the clip 7, the opening 12 is closed, and the inside of the light-shielding envelope 4 becomes light-tight. In addition, even when the central portion of the light-shielding envelope 4 expands when it is pushed in, since the bent portions 11a and 11b are widened at the central portion of the clip 7, the fitting can be performed smoothly. Further, since the upper and lower portions of the light-shielding envelope 4 are sandwiched between the positions D and E where the interval between the clips 7 is narrowed, external light does not enter the inside from the opening 12.

Next, when the film holder is set in the unlocked state and the notch 19 is strongly picked, the upper and lower portions of the light-shielding envelope 4 come into contact via the opening 16. When the light-shielding envelope 4 is pulled out in this state, the film unit 3 is taken out of the film holder together with the light-shielding envelope 4.

During the handling of the photo film package 2,
The film unit 3 moves within the light-shielding envelope 4 and the clip 7
May come off the light-shielding envelope 4. In this case, the light-shielding envelope 4 may be bent at the end of the thick paper 18 and fixed with a tape. Since the slots 15 are formed corresponding to the bent portions, the second carrier sheet 14 can be easily bent.

[0019]

As described in detail above, in the photographic film package of the present invention, since the projections are formed on both contact surfaces of the clip which comes into contact with the carrier sheet, the clip is not deformed. The clip and the carrier sheet can be firmly fixed. Furthermore, the degree of opening of the tip of the clip is equal to each other at both ends, and the center is set to be equal to or wider than the both ends, and the portion sandwiched between the center and both ends is equal to each other, and both ends are equal. Since the setting is made equal or narrower, the light-shielding envelope can be smoothly fitted into the clip, and light-shielding can be ensured.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view showing a swaged shape of a clip.

FIG. 2 is an explanatory diagram showing how the clip is opened when viewed from the direction of the arrow shown in FIG. 1;

FIG. 3 is a perspective view of the photo film package showing a state where the photo film is exposed.

FIG. 4 is a plan view of the photo film package showing a stored state.

FIG. 5 is an enlarged sectional view showing a swaged shape of a conventional clip.

FIG. 6 is an enlarged sectional view showing a conventional clip different from the swaged shape shown in FIG. 5;

[Explanation of symbols]

 2 Photographic Film Package 3 Film Unit 4 Shading Envelope 5 Photographic Film 7 Clip 10 Body 10a Projection 11a, 11b Folded Piece 12 Opening

Claims (3)

(57) [Claims] 1. A film unit comprising a sheet-like photo film, a carrier sheet attached to the photo film, and a clip fixed so as to sandwich the carrier sheet from both sides, and fitted into the clip. A photo film package comprising a light-tight envelope for storing the photo film in a light-tight manner, wherein the clip and the carrier sheet are fixed by projecting on both contact surfaces of the clip contacting the carrier sheet. A photographic film package characterized by being formed by swaging. 2. The degree of opening of the tip of the clip is such that both ends are equal to each other, and the center is equal to or wider than the ends, and the portion sandwiched between the center and both ends is equal to each other. 2. The photographic film package according to claim 1, wherein the photographic film package is set to be equal to or narrower than both ends. 3. The photographic film package according to claim 1, wherein the clip is provided with a protrusion formed by caulking left and right symmetrically except for a central portion.