JP3173991B2 - Photo roll 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 roll film, and more particularly to an improvement in a light-shielding paper and a spool constituting a photographic roll film such as a 120 type or 220 type film.

[0002]

2. Description of the Related Art As a roll film for photography, 120 is used.
Type and type 220, both of which are shown in FIG.
The appearance is as shown in the figure. Photo roll film 1
As shown in FIG. 26, a 120-type photographic film 2 used in the first embodiment has a light-shielding paper 3 as a backing paper fixed to the back surface side with an adhesive tape 4. The 220 type photo film is
The backing paper is omitted, light-shielding paper called a leader paper or a trailer is fixed before and after the paper, and the photographic film is lengthened to increase the number of shot frames.

[0003] The spool 5 is an ISO 732-198.
2, ANSI PHI 21-1980, JIS K7
As shown in FIG. 27, a pair of flanges 7 for regulating both end surfaces of the light-shielding paper 3 are formed at both ends of the shaft portion 6, and a slit is formed at the center of the shaft portion 6. 8 are formed long in the axial direction.

At the time of manufacturing the photographic roll film 1, the rear end 3 b of the light-shielding paper 3 is inserted into the slit 8 of the shaft 6, and then the spool 5 is rotated. Wind the film 2. Thereafter, the leading end 3a of the light-shielding paper 3 is folded at a predetermined width, and the leading end 3a is fixed with an adhesive tape 9 so that the photographic film 2 is not loosened.
In addition, a chucking groove 10 to be engaged with the key shaft of the camera is formed at the center of each flange 7.

When the photographic roll film 1 is loaded in the camera, a spool 5 having the same structure as the spool 5 is set in a film winding chamber of the camera. Then, the adhesive tape 9 is peeled off while pressing the light-shielding paper 3 with a finger so that the light-shielding paper 3 is not loosened, and the photographic roll film 1 is inserted into the film loading chamber of the camera, and the chucking grooves 10 of each flange 7 are filmed. The key shaft provided in the loading chamber is engaged.

FIG. 28 shows a section taken along the line YY of FIG.
, The leading end 3a of the light-shielding paper 3 is inserted into the slit 8 of the spool 5 set in the film winding chamber,
The user operates the winding lever of the camera while pressing the light-shielding paper 3 with a finger so that a does not fall out of the slit 8. The light-shielding paper 3 is wrapped around the spool 5 one or more times (generally two to three times), and after confirming that the leading end 3a of the light-shielding paper 3 does not come off from the spool 5, the camera back lid is closed. After this,
Further, when the film is wound up by a predetermined amount by operating the winding lever of the camera, the photographic film 2 is set to the exposure position and the photographing can be performed.

The take-up lever is operated each time a picture is taken, and the photographed film 2 is taken up on the spool 5 in the film take-up chamber. When all the pictures have been taken, the take-up lever can be continuously operated. Continue the hoisting operation until the resistance decreases. Then, the back cover of the camera is opened, and the exposed photographic roll film 1 is held while pressing the rear end 2b from above so that the photographic film 2 does not become loose.
Is taken out of the film winding chamber, and the rear end 3b is fixed with an attached adhesive tape. Then, for the next film loading, the spool 5 remaining in the film loading chamber is taken out and set in the film winding chamber.

However, when loading the film, the leading end 3a of the light-shielding paper 3 is easily pulled out of the slit 8, so that the winding lever must be operated while pressing the light-shielding paper 3 with a finger as described above. , Is very troublesome. In addition, when the initial winding state is poor, for example, when the center of the spool 5 and the center of the distal end portion 3a are displaced in the axial direction, the deviation increases as the winding of the light-shielding paper 3 progresses. The side edge of No. 3 is folded and wrapped, resulting in a thickened winding with a larger diameter. When this thickening occurs, the light-shielding property between the side edge of the light-shielding paper 3 and the inner wall of the flange also deteriorates, so that fogging may occur at the edge of the photographic film 2.

In order to improve this, a projection is provided on the inner surface of the slit to increase the frictional resistance between the light-shielding paper and the spool (Japanese Patent Laid-Open No. 1-251030). Are provided with projections, and these are fitted together (Japanese Patent Laid-Open No. 2-235052).
JP-A-2-137842, in which one or both of the contact areas between the spool and the leading end of the light-shielding paper are subjected to a surface deformation process so that they can be locked to each other.
Japanese Patent Application Laid-Open No. 2-160231 discloses a method in which an edge angle between an inner wall surface of a slit and a surface of a winding shaft is set to a specific angle.

Various types of 35 mm spools have been proposed in which a locking claw is provided in a slit so as to engage with a locking hole formed in the leading end of the film.
No. 930144 describes that the present invention can be applied to a certain form of light-shielding paper. However, each of them has a drawback that the opening of the slit has directionality and the leading end of the light-shielding paper can be inserted from only one opening. For this reason, it is necessary to check the direction of the spool and to set the spool in a predetermined direction each time the spool that has been emptied after the shooting is transferred from the film loading chamber to the film winding chamber. However, there is a disadvantage that the film cannot be replaced quickly.

[0011]

However, in each of the inventions described in the above-mentioned publications, it is not always necessary to completely assist with a finger. In each case, the first two to three turns are manually assisted by a finger or the like. It is necessary to perform the loading operation while
It is hard to say that film loading is simple and reliable. For this reason, it is difficult to automate film loading of a camera using a 120 type or 220 type photographic roll film.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a photographic roll film that can be easily and reliably wound around a spool and that can also automatically automate film loading.

[0013]

According to a first aspect of the present invention, there is provided a photographic roll film, comprising: a strip-shaped photographic film having a light-shielding paper fixed at least at a leading end;
A slit is formed in the axial direction, and a spool having a cylindrical winding shaft around which the photo film is wound in a roll shape, wherein at least one locking hole is provided at a leading end of the light-shielding paper. In one of the upper and lower walls forming the slit, one of the upper and lower walls is formed with a locking claw that is engaged with the locking hole and has a lateral claw at an apex that extends in the axial direction, and the other is formed. On the wall, a light-shielding paper pressing rib for pressing the light-shielding paper inserted into the slit toward the one wall is formed.

[0014] The photographic roll film according to claim 2 is
Oite to claim 1, wherein the backing paper pressing rib height is made larger than the value obtained by subtracting the thickness of the backing paper from the distance between the vertex and opposite the other wall of the locking claw.

[0015]

The photographic roll film according to claim 3 is
Oite to claim 2, substantially symmetrical with respect to the straight line passing through the locking pawl and the cross-sectional shape perpendicular to the axial direction of the winding axis of the backing paper holding rib, the center of the wall perpendicular to a and a section forming the slit With the shape, the edge of the locking claw and the light-shielding paper holding rib facing the opening of the slit is inclined with respect to the upper and lower wall surfaces, and at least the edge of the locking claw near the root of the horizontal claw The inclination angle θ satisfies the following equation 1.

[0017]

Tan θ ≧ t / (ef)

Here, t: thickness of the lateral claw e: up and down of the slit from the contact point between the edge of the locking claw and the edge of the locking hole when the locking hole engages with the locking claw to the base of the horizontal claw Distance in the direction parallel to the wall surface f: Moving distance in the direction parallel to the upper and lower wall surfaces of the slit from when the locking hole engages with the locking claw until the locking hole engages with the horizontal claw

The photographic roll film according to claim 4 is
Oite to claim 3, in which provided on the inner side than the edge of the locking claw of the transverse nail.

The photographic roll film according to claim 5 is
Oite to claim 4, in which the light-shielding sheet insertion direction opposite edges of said lateral claws to a curved surface.

The photographic roll film according to claim 6 is
Oite to claim 1, the shape of the tip portion of the backing paper is the width narrows toward the tip, the tip portion of the backing paper continue to insert into the slit, both of the front end portion of the backing paper When the side edge abuts against both ends of the slit, the position of the hole is determined so that the center of the hole of the light-shielding paper is located substantially at the center of the hook.

The photographic roll film according to claim 7 is
Oite to claim 6, said locking claw, provided with the center in the axial direction of said one wall, the backing paper pressing rib,
A pair is formed on the other wall around the locking claw,
The leading end of the light-shielding paper is composed of a narrow portion formed narrower than the width of the light-shielding paper over a predetermined length and a trapezoidal portion having both side edges inclined thereafter, and the width of the narrow portion is reduced. The width of the narrow portion is narrower than the interval between the light-shielding paper pressing ribs and the length of the narrow portion is longer than half the cross-sectional width perpendicular to the axial direction of the slit.

[0023] The photographic roll film according to claim 8 is
Oite to claim 7, the locking pawl and opposite surface of the backing paper holding rib, in which is inclined such that the thickness becomes thinner as convex protrusion, and toward the apex toward the locking claw .

The photographic roll film according to claim 9 is
In a photographic roll film comprising at least a strip-shaped photo film having a light-shielding paper fixed at a leading end thereof, and a spool having a cylindrical winding shaft around which the photo film is wound in a roll shape, the leading end of the light-shielding paper is provided. At least one locking hole is formed, and a first slit is formed in the winding shaft at the center of the winding shaft, and a longitudinal direction is parallel to the axial direction. And a pair of second slits formed in the first slit, the upper and lower walls forming the first slit are each formed in a planar shape, and one of the upper and lower walls forming the second slit has the locking hole Is formed on the other wall, and a light-shielding paper holding rib for pressing the light-shielding paper inserted into the second slit against the one wall is formed on the other wall.

The photographic roll film of claim 10, in claim 1, to both ends of the spool, which flange is integrally formed, to form the shaft portion and the concentric grooves on the inner wall of the front Symbol flange It is.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The appearance of a 120 type photographic roll film of the present invention is not different from the conventional one shown in FIG. In FIG. 2, a spool 20 according to the present invention includes a shaft portion 21 and a pair of flanges 22 formed at both ends thereof. A long slit 23 is formed in the axial center of the shaft portion 21 in the axial direction, and a leading end 24a of a light-shielding paper 24, which is a backing sheet of the photo film, is inserted into the slit 23. The distal end portion 24a is composed of a narrow portion 25a formed narrower than the width of the light-shielding paper 24 over a predetermined length, and a trapezoidal portion 25b having both side edges 25c inclined thereafter. In addition, each area | region of the narrow part 25a and the trapezoid part 25b is shown by the oblique line in FIG.

At the center of each flange 22, there is formed a chucking groove 26 which is engaged with a key shaft provided in a film loading chamber or a film winding chamber of the camera. The shape of the chucking groove 26 may be a cross shape, but in this embodiment, the slit 23 is used in order to facilitate the positioning of the opening of the slit 23 and to enable automatic loading.
Are formed in an I-shape which is elongated in a direction perpendicular to the longitudinal direction. Also, the trapezoidal portion 25b of the leading end 24a of the light-shielding paper 24
Has a circular locking hole 27 formed therein. Reference numerals 15 and 16 indicate a guide roller and a driving roller of the camera.

As shown in FIG. 3, one end of the photographic film 28 with the long light-shielding paper 24 wound around the shaft portion 21 of the spool 20 is fixed to the back surface of the light-shielding paper 24 by an adhesive tape 29. ing. Photo film 28
Is in contact with the light-shielding paper 24 on the back surface side.
When the photographic film 28 with the 4 is wound around the shaft portion 21 of the spool 20, the photographic film 28 is wound with the emulsion side of the photographic film 28 inside.

The rear end 24b of the light-shielding paper 24 opposite to the front end 24a is not provided with a locking hole 27, and the rear end 24b is inserted into the slit 23 of the spool 20,
The photographic roll film of the present invention is commercially available in a state where the unexposed photographic film 28 is wound around the spool 20. Thus, at the end of use of the photo roll film, all the light-shielding papers 2 are placed on the spool 20 of the film take-up chamber.
When the exposed photographic film 28 with 4 is wound, the rear end portion 24b easily comes out of the slit 23.

4, the spool 20 is viewed from one opening 23a of the slit 23. In the upper wall 23b of the slit 23, the light blocking paper 2 is engaged with the locking hole 27.
4 is formed with a T-shaped locking claw 30 for locking the tip portion 24a of the spool 20 to the shaft portion 21 of the spool 20. The locking claw 30 is formed on the lower wall 23c facing and parallel to the upper wall 23b. A pair of light-shielding paper holding ribs 32 is formed.

As shown in FIG. 1, the edges 30a, 3 facing the openings 23a, 23d side of the slit 23 of the locking claw 30 are formed.
0b is a slope having two types of inclination angles, and at the apex thereof, lateral claws 30c and 30d are formed to protrude in the axial direction of the shaft portion 21. These side claws 30c, 30
d has a substantially rectangular flat shape parallel to the upper wall 23b and the lower wall 23c, but is formed inside the edges 30a and 30b, and has a curved surface facing the openings 23a and 23d. The edge of the front end portion 24a of the light-shielding paper 24 is not caught by the horizontal claws 30c and 30d. The locking claw 30 has the same shape when viewed from either side of the openings 23a and 23d, and is symmetrical when viewed from the side orthogonal to the axial direction of the shaft portion 21.

When viewed from the side perpendicular to the axial direction of the shaft portion 21, the light-shielding paper pressing rib 32 has a symmetrical mountain shape, for example, a substantially arc shape in the present embodiment, and has openings 23a, 2a.
In the same manner from both sides of 3d,
4a can be guided toward the locking claw 30. In addition, such a locking claw 30, a light-shielding paper holding rib 3
Due to the shape of 2, the rear end portion 24b of the light-shielding paper 24 without the locking hole 27 and the conventional light-shielding paper can be inserted into the slit 23 of the spool 20 of this embodiment without any trouble. Compatibility with products is ensured.

As shown in FIG. 5, the upper wall 23 of the locking claw 30
h from height b₁, Lower wall 23 of rib 32 for shading paper
h from height c_Two, The thickness of the side claws 30c and 30d
t₁, The distance between the upper wall 23b and the lower wall 23c (slit 23
Width) to H₁Then, H₁+ T ₁<(H₁+ H_Two) <
2H₁It is preferable to satisfy the following relationship. This allows
As shown in FIG. 4, the leading end 24a of the light-shielding paper 24 has a slit.
23, the light-shielding paper holding ribs 32
To the locking claw 30 side, and the locking hole 27 and the locking claw 3
The engagement with 0 is reliably performed.

Specifically, H₁Is 1.8 mm to 3.0 m
m is optimal and (h₁+ H_Two) Is H₁+ T₁+
(0.1 mm to 0.5 mm) is optimal. Say this
In other words, the overlap between the locking claw 30 and the locking hole 27
The thickness is the thickness t of the horizontal claws 30c and 30d. ₁0.1 mm to 0.
The size obtained by adding 5 mm is optimal. In addition, the locking claw 30
D between the rib and the light-shielding paper holding rib 32₁Of the light-shielding paper 24
Adjustment is required depending on rigidity and tip shape.
0 mm is preferred, and especially 7 mm to 17 mm is optimal.
You. When the horizontal claws 30c and 30d are omitted,
(H₁+ (Thickness of shading paper) + h_Two)> H₁May be
(H₁+ H_Two)> H₁Is preferred.

The distance D ₂ between the light-shielding paper holding ribs 32 is
As shown in FIG. 6, wider than the width D ₃ of the narrow portion 25a of the distal end portion 24a of the backing paper 24, the length l ₁ of the narrow portion 25a,
It is longer than half the cross-sectional width l ₂ perpendicular to the axial direction of the slit 23. With such a configuration, the tip 2
When the slits 4a are inserted into the slits 23, the narrow portions 25a are reliably guided on both sides by the light-shielding paper pressing ribs 32 over a long range. It is inserted straight without going off center. Thereby, the locking hole 27 and the locking claw 3
0 is securely engaged.

The locking hole 27 is formed by cutting the distal end portion 24a into the slit 2
3, the center of the locking hole 27 substantially coincides with the center of the locking claw 30 with both side edges 25 c of the trapezoidal portion 25 b contacting both ends of the slit 23. It is formed. Further, the diameter φ ₁ of the locking hole 27 is
c, from the distance D ₅ between the ends of the 30d, for example, 0.5mm
It is set to about 1.0 mm larger.

The leading end 24a of the light-shielding paper 24 is
4, the leading end 24a is guided between the light-shielding paper holding ribs 32, and the light-shielding paper 24 is inserted in the middle of the slit 23, as shown by a two-dot chain line in FIG. As this insertion progresses, as shown in FIGS. 6 and 7, the edge 25c of the trapezoidal portion 25b comes to ride on the light-shielding paper pressing rib 32, and the light-shielding paper 24 is moved toward the locking claw 30 in the thickness direction. Be raised towards.

When the edge 25c is brought into contact with both ends of the slit 23, the locking hole 27 is engaged with the locking claw 30, and as shown in FIG. Edge 30a, 30b
Contacted. The edges 30a and 30b of the locking claw 30 are formed with a gentle slope at the bottom of the upper wall 23b and a slightly steep slope near the top. Once the locking hole 27 is engaged with the locking claw 30 and the spool 20 is rotated in the winding direction, the light-shielding paper 24 is relatively moved in a direction to come out of the slit 23. At this time, the edge of the locking hole 27 moves along the edge 30b of the locking claw 30, and as shown in FIG. The inclination angle of the portion near the vertex of 30b is θ, and the point of contact P between the edge of the lock hole 27 and the edge 30b of the lock claw 30 is
The distance to the base of 0d is e, and the locking hole 27 is the locking claw 30
Assuming that the movement distance from the engagement with the locking hole 27 to the engagement with the lateral claw 30d is f, these values of θ, e, and f are
Equation 3 below must be satisfied. Note that the inclination angle θ is
Edge 3 at contact point P in which engagement hole 27 is engaged with lateral claw 30d
0b is an angle formed by a surface parallel to the surfaces of the upper and lower walls 23b and 23c (the surface of the light-shielding paper 24 in FIG. 7).

[0039]

[Equation 3] tan θ ≧ t ₁ / (ef)

When the values of θ, e, and f do not satisfy Equation 3, the edge of the locking hole 27 is shifted to the edge 30b of the locking claw 30.
, The locking hole 27 comes off the locking claw 30 without engaging with the lateral claws 30c and 30d. If the values of θ, e, and f satisfy Equation 3,
By the rotation of the spool 20, the edge of the locking hole 27 is engaged with the lateral claws 30c, 30d as shown in FIG.

In FIG. 9 showing the structure of the flange 22,
In order to make the light-shielding property between the flange 22 and the light-shielding paper 24 perfect, the width D ₆ of the light-shielding paper 24 (see FIG.
Identical to the distance between the 2 (SP-Inside dimension) D _7, or are slightly larger. For example, D ₆ = 62.70 mm
~62.85mm, D ₇ = 62.70mm ± 0.1mm
(Measured 1.0 mm to 1.5 mm inside the outer edge of the flange).

If the width D ₆ is too large or the distance D ₇ varies, the light-shielding paper 24 is not tightly wound up to the shaft portion 21 and the winding diameter φ ₂ becomes large. To prevent this,
In this embodiment, the inner wall of the flange 22 and the depth h ₃ of the groove 2
2 a is formed concentrically with the shaft portion 21. Thereby, for example, the light-shielding paper 24 contacting the inner wall of the flange 22
Since the side edge of is prevented from being folded and folded,
The thickening of the light-shielding paper 24 is prevented, and the side edge of the rolled-up light-shielding paper 24 on the rear end 24b side and the inner wall of the flange 22 are completely adhered to each other, so that the light-shielding property is completely maintained.

The depth h ₃ of the groove 22a is 0.15 m
m to 0.30 mm, preferably 0.20 mm to 0.25
mm. The widths D ₈ and D ₉ of the inclined surface on the shaft portion 21 side and the inclined surface on the flange tip side of the groove 22 a are preferably as narrow as possible, but are set to 0.8 mm to 1.0 mm in view of formability (depth to longer the larger the h _3). The groove 22a
Width D ₁₀ of the bottom surface of, 1.0mm~3.0mm, preferably a 1.5Mm～2.0Mm. In addition, it is effective to perform the chamfering of R1 to R3 at the boundary between the bottom surface of the groove 22a and each slope to prevent scratches during molding. Further, the shaft diameter phi ₃ of the shaft portion 21, and 11.8Mm～12.0Mm, also outside diameter phi ₄ of the flange 22 is 25.2 mm-0.2 mm to
+0.1 mm is desirable.

When the 220 type photographic film 33 is wound around the shaft portion 21 of the spool 20, the result is as shown in FIG. As shown in FIG. 11, a 220 type photographic film 33 has light-shielding papers 34 and 35 called a leader paper and a trailer joined to each other with adhesive tapes 36 and 37, respectively. Not provided. For this reason, the photo film 33 is twice as long as the 120 type and the number of frames that can be photographed is also twice. However, when the photo film 33 is wound around the shaft 21 of the spool 20, it is slightly thicker than the 120 type. only will, fits well to the outer diameter φ ₄ of the flange 22. Also in this case, even if there is a slight variation in the width of the photo film 33 or a meandering when winding the photo film 33, the groove 22a prevents the film from becoming thick and the light shielding paper 3
4 is in close contact with the inner wall of the flange 22, so that sufficient light-shielding properties can be obtained. In the case of the 220 type as well, a locking hole 38 similar to the locking hole 27 is formed at the leading end 34a of the light-shielding paper 34.

When the spool 20 configured as described above is set in the film take-up chamber of the camera, the chucking groove 26 has an I-shape that is long in the width direction of the short slit 23. The opening 23a of the slit 23 is detected by detecting the rotation angle of the combined key shaft.
Alternatively, the spool 2 may be positioned so that one of the openings 23d easily receives the leading end 24a of the light-shielding paper 24, that is, faces the guide roller 15 and drive roller 16 of the camera.
The rotation angle of 0 is adjusted by the control mechanism of the camera.

After the photographic roll film is inserted into the film loading chamber of the camera, the leading end 24a of the light-shielding paper 24 is positioned on the drive roller 16 and the back cover is closed. The spring sandwiches the leading end 24 a between the spring and the drive roller 16. Subsequently, the feed motor of the camera is driven, and the driving roller 16 rotates to move the leading end portion 24a through the guide roller 15 to the opening 23a of the slit 23.
Feed towards.

Edge 25c of trapezoidal portion 25b of tip 24a
Are brought into contact with both ends of the slit 23, the drive roller 16
, The control mechanism of the camera detects this and stops feeding the light-shielding paper 24. Then, the spool 20 of the film winding chamber is started to rotate in the winding direction. Accordingly, the distal end portion 24a is moved to the vertex side of the locking claw 30, the edge of the locking hole 27 is engaged with the horizontal claws 30c, 30d, and the distal end portion 24a is locked to the spool 20. Subsequently, the spool 20 rotates and the light-shielding paper 24 having a predetermined length is wound around the spool 20 from the leading end 24a, and the first frame of the photographic film 28 is set at the exposure position.

When the release operation of the shutter button and the film feeding are repeated, and the photographing of all the frames is completed, the remaining light-shielding paper 24 is continuously wound on the spool 20 of the film winding chamber. At this time, since the locking hole 27 is not formed in the rear end portion 24b, the locking claw 3 of the spool 20 is not provided.
All the light-shielding papers 24 are wound around the spool 20 of the film winding chamber without the rear end 24b being hooked at zero. Thereafter, by opening the back cover, the exposed photographic roll film can be collected from the film winding chamber. Then, in preparation for the next film loading, the spool 20 remaining in the film loading chamber is removed and set in the film winding chamber.

As shown in FIG. 12, two locking holes 27 may be provided in parallel in the longitudinal direction of the light-shielding paper 24. In addition, the shape of the locking hole 27 may be elliptical or the like in addition to the circular shape. The locking hole 27 has a size that can be engaged with the locking claw 30. Any shape may be used as long as it does not come off the engagement.

Next, referring to FIGS. 13 and 14, which show a spool provided with a light-shielding paper holding rib of another shape, a locking claw 41 is shown.
The edges 41a and 41b have different shapes from the above embodiment,
It has a slope with one kind of inclination angle. Also,
Although the lateral claws 41c and 41d have the same shape as that of the above-described embodiment, a cross-sectional shape as shown in FIG. 15 can be adopted. (A) is a thin elliptical shape, and is a cross-sectional shape of the lateral claws 41c and 41d of the present embodiment. (B) is a diamond,
(C) is a diaper shape, and (D) is a flat plate shape. The features of these shapes are that there is no surface perpendicular to the light-shielding paper insertion direction (the direction of the arrow R and the direction of the arrow L) or the corner is rounded. And a symmetrical shape. In FIG. 13, the same members as those in the above embodiment are denoted by the same reference numerals.

The light-shielding paper holding ribs 42 are provided at the openings 23 a and 23 d of the slit 23 and at the center of the slit 23.
It has a substantially triangular pyramid shape having ridge lines 42a, 42b, 42c inclined toward the direction. This ridge line 42a,
Reference numeral 42b allows the light-shielding paper 24 to be inserted from any of the openings 23a and 23d. Further, as shown in FIG. 16, in the case of the light-shielding paper pressing rib 45 whose surface facing the center of the slit 23 is vertical, when the light-shielding paper 24 is inserted far from the center of the slit 23, the light-shielding paper pressing is performed. The vertical surface of the rib 45 becomes an obstacle and cannot return to a normal position.
In some cases, the engagement between the locking hole 27 and the locking claw 41 becomes poor. However, in the case of the present embodiment, FIG.
As shown in (2), both side edges of the light-shielding paper 24 come into contact with the inclined ridge 42c of the light-shielding paper pressing rib 42, and the light-shielding paper 24 is moved toward the center of the slit 23 by the reaction received from the ridge 42c. , Can return to the normal position.

Next, in FIG. 17 showing a spool having a different shape, a spool 50 has a slit 52 having a flat inner wall surface, apart from a pair of slits 51 in which the light-shielding paper 24 is locked.
Are formed at the axis center of the shaft portion 53. The slit 52 is used when a photographic roll film is manufactured. Since there is no locking claw, light-shielding paper having locking holes at both ends can be used.

18 and 19, which show the structure inside the slit 51, the upper wall 51a constituting the slit 51 has horizontal claws 55a, 55 left and right viewed from the openings 51b, 51c.
b, a T-shaped engaging claw 55 is formed, and the lower wall 5
1d, a pair of light-shielding paper pressing ribs 5 sandwiching the locking claw 55 is provided.
6 are formed. At the apex of the locking claw 55, lateral claws 55a and 55b are formed to protrude in the axial direction of the shaft portion 53. Note that the light shielding paper pressing rib 56 may be provided on the upper wall 51a side, and the locking claw 55 may be provided on the lower wall 51d side.

As shown in FIG. 20, each of the locking claw 55 and the light-shielding paper pressing rib 56 has a mountain shape of an isosceles triangle when viewed from a plane orthogonal to the axial direction of the shaft portion 53. Locking claw 5
Angles α ₁ , α formed by the ridge lines 55c, 55d of the fifth with the upper wall 51a
₂ is α ₁ = α ₂ , the ridge line 56 a of the light-shielding paper holding rib 56,
Since the angles β ₁ and β ₂ formed by 56 b and the lower wall 51 d are β ₁ = β ₂ , the light-shielding paper 24 can be inserted from any of the openings 51 b and 51 c.

The height of the locking claw 55 from the upper wall 51a is
h_Four, The height from the lower wall 51d of the shading paper holding rib 56
h_Five, The thickness of the side claws 55a, 55b is t_Two, The upper wall 51a
The distance from the lower wall 51b is H_TwoThen, the first embodiment and
Similarly, H_Two+ T_Two<(H_Four+ H _Five) <2H_TwoThe relationship
Preferably, it is satisfied. H_TwoIs 1.8 mm to 2.8 mm
Is optimal and (h_Four+ H_Five) Is H_Two+ T_Two+ (0.
1 mm to 0.3 mm) is optimal. That is, the locking claw
55 and the locking hole 27 are overlapped by the horizontal claws 55a,
55b thickness t_Two0.1mm to 0.3mm added to
The dimensions are optimal.

As shown in FIG. 21, two locking claws 61 may be provided in the axial direction, and one light-shielding paper pressing rib 62 may be provided. In this case, as shown in FIG.
The number of the locking holes 27 formed in the front end portion 24a of the fourth 4 is two or four in parallel.

23 and 24, the locking claw 61 of the spool 60 has a tapered surface 61a only on the side facing the light-shielding paper insertion direction (the direction of the arrow L), and has a hook portion 61b at its top. Is formed. Further, the light-shielding paper pressing rib 62 has a tapered surface 62a only on the side facing the direction of the arrow L similarly. Thus, when the leading end 24a of the light-shielding paper 24 is inserted into the slit 63 from the direction of arrow L, the leading end 24a becomes tapered 61
A pair of locking holes 27 as shown in FIG. 20 are engaged with the hook portion 61b while being guided by the a and 62a, and the distal end portion 24a is locked to the spool 60.

The paper support used for the light-shielding paper used in the present invention is not particularly limited. In addition to the paper support using natural pulp as a main raw material, if necessary, natural pulp and synthetic fibers or synthetic fibers can be used. A paper support in which pulp and pulp are mixed in an arbitrary ratio can be used. In addition, a paper support in which recycled pulp and waste paper are mixed in an appropriate amount, and a paper layer made of recycled pulp and waste paper are combined with a paper layer made of natural pulp. The body can be used.

As the natural pulp, kraft pulp of softwood, hardwood, or a mixture of softwood and hardwood is preferable. As the natural pulp used in combination with kraft pulp, sulfide pulp is preferable, but SCP, CGP, TMP, and RGP are used.
And high yield pulp can also be used in an appropriate amount.

Various additives can be incorporated into the paper support of the present invention when preparing the stock slurry. In particular, fatty acid metal salts and / or fatty acids as sizing agents,
Alkyl ketene dimer emulsion or epoxidized higher fatty acid amide, alkenyl or alkyl succinic anhydride emulsion, rosin derivative described in JP-B-62-7534; anionic and cationic as a dry paper strength enhancer Or benign polyacrylamide, polyvinyl alcohol, and cationized starch (for example, see JP-A-3-171)
No. 042), vegetable galactomannan and the like; polyamine polyamide epichlorohydrin resin and the like as a lubricating paper strength enhancer; clay, kaolin, calcium carbonate, titanium oxide and the like as filler; aluminum chloride, bansulfate and the like as a fixing agent Water-soluble aluminum salts and the like; pH adjusting agents such as caustic soda, sodium carbonate, sulfuric acid, etc., JP-A-63-204251, JP-A-1-26653
It is desirable to incorporate a color pigment, a color dye, a fluorescent image whitening agent and the like described in JP-A No. 7 and the like in an appropriate combination.

The paper support may further contain various water-soluble polymers, latexes, emulsions, and additives such as an antistatic agent by various coating methods, spraying, tub size, size press and the like.

As the water-soluble polymer, JP-A-1-26
No. 6537, starch-based polymers, polyvinyl alcohol-based polymers, gelatin-based polymers, polyacrylamide-based polymers, cellulose-based polymers, and the like;
Examples of the antistatic agent include nonionic surfactants represented by polyoxyethylene glycols, cationic surfactants represented by quaternary ammonium salts, amphoteric surfactants, alkylamine derivatives, fatty acid derivatives, various Lubricant,
Carbon black, graphite, metal surface coating pigment,
There are conductive materials such as metal powder, metal frame, carbon fiber, metal fiber, and whisker (potassium titanate, alumina nitride, alumina). Specific compounds include alkali metal salts such as sodium chloride and potassium chloride, and calcium chloride. And alkaline earth metal salts such as barium chloride, colloidal metal oxides such as colloidal silica, and organic antistatic agents such as polystyrene sulfonate.

As latex and emulsions, petroleum resin emulsion, styrene-acrylic acid-acrylate copolymer, styrene-acrylic acid-butadiene copolymer, ethylene-vinyl acetate copolymer, styrene-
Latexes such as maleic acid-acrylic acid ester copolymers; clay, kaolin, talc, barium sulfate, titanium oxide, etc. as pigments; hydrochloric acid, phosphoric acid, citric acid, caustic soda, etc. as pH regulators; It is desirable that additives such as a coloring dye and a fluorescent whitening agent are appropriately combined and contained.

In the case where the paper support alone is used for complete light shielding or a light shielding layer is provided in a later step, black paper may be used for the light shielding paper support as an auxiliary light shielding layer. 1 to 15% by weight of furnace carbon black having a particle size of 15 to 80 μm, and an average particle size of 0.1 to 5 μm
Black paper supports containing 0.1% to 10% by weight of synthetic zeolite m are preferred. Particularly, 0.01 to 5% by weight of a cationic water-soluble polymer and a black or blue cationic dye (a diarylmethane type, a triallylmethane type, a thiazole having a positive charge in a coloring portion) are further added to the above black paper support. Methine-based, xanthine-based, oxazine-based, thiazine-based, azo-based, and anthraquinone-based dyes).

Next, regarding the stock slurry to which an internal additive has been added, for example, JP-A-58-37642, JP-A-61-260240, and JP-A-61-2847.
No. 62, etc., using an appropriate papermaking method, a fourdrinier paper machine, using a commonly used paper machine such as a round net paper machine, to produce a uniform formation can be obtained, Further, after papermaking, by calendering using a machine calendar, super calendar, heat calendar, etc.,
The basis weight of the paper support is 50 g / m ^{2 to} 100 g / m ^2.
2 , preferably 60 g / m ^{2 to} 90 g / m ² ,
5 μm to 120 μm, preferably 60 μm to 100 μm
In the range of, and physical performance, to prevent adverse effects due to irregularities on the paper support surface such as scratches and pressure fog on the photosensitive material,
A base paper having a smoothness of 90 seconds or more as defined in JISP-8119 is preferable in order to eliminate gaps between the photosensitive material and improve light-shielding properties and moisture-proof properties.
In seconds or more, the air permeability (JISP-8117) has 500 seconds or more, and the sizing degree is 1 in the post-process or in the stiff hide size (JISP-8122) based on the water and moisture resistance of the light-shielding paper.
Supports having 0 seconds or more are preferred.

Further, in the present invention, the breaking strength of the locking hole due to the locking claw poses a problem. However, the winding load of the camera is a driving force load load that generates a pull-out load of about 200 to 300 g. The stopping force is preferably 500 g or more. Therefore, as the base paper strength, the tensile strength (JISP-8113) (vertical) 4.5 kgf /
15 mm or more, tear strength (JISP-8116) is 3
It preferably has a characteristic of 5 gf or more.

As the thermoplastic resin for processing the light-shielding layer on the back surface of the paper support, USP-2646365, USP-2
646366, USP-2751309, USP-29
59492, FR-1449852, JP-B-51-49
No. 205, JP-A-48-22020, and JP-A-50-676.
No. 44, No. 55-140835, No. 58-17434
No. 58-186744, No. 59-68238,
No. 60-35728, JP-A-6-51450, etc., low density, medium density, high density, linear low density polyolefins such as polyethylene and polypropylene, polyvinyls such as ethylene vinyl acetate, ethylene ethyl acrylate Acrylics such as and ethylene methyl acrylate,
A simple substance such as a rubber-based substance such as styrene / butadiene, a simple substance such as ionomer, a graft polymer polyamide-based substance, or a polyester-based substance such as polyethylene / terephthalate, or a blend or a copolymer of two or more kinds of such substances may be used. The resin may be provided as two or more layers.

As the light-shielding substance added to the resin, carbon black, titanium nitride and graphite, which are light-absorbing light-shielding substances having excellent hiding power, are preferable. For the purpose of improving light-shielding properties, cost and physical properties, carbon black is preferably used. Good.
In particular, furnace carbon black is generally and preferably used, but may be manufactured by any of channel and thermal methods. In particular, acetylene carbon black and Ketjen carbon black, which is a modified by-product carbon black, are preferable as the light-shielding substance having an antistatic effect.

The photographic light-sensitive material of the present invention has no fogging, does not affect the increase / decrease in light sensitivity, has a large light-shielding ability, and has a large light-shielding ability even when added to a resin. Alternatively, among carbon blacks, pH is 6.0 to 9.0, and average particle diameter is 10 μm to 120 in particular, since pinholes are hardly generated in the film.
μm, preferably 15 μm to 100 μm, particularly preferably 20 μm to 80 μm, the volatile component is 2.0% or less, preferably 1.0% or less, particularly preferably 0.5% or less, and the oil absorption is 50 ml / 100 g or more, preferably Is 70ml /
Furnace carbon black of 100 g or more, particularly preferably 100 ml / 100 g or more, is preferred because it improves light-shielding properties and dispersibility, and has little adverse effect on photographic light-sensitive materials and little deterioration in physical properties.

Actual products include, for example, carbon blacks # 20 (B), # 30 (B), and # 33 manufactured by Mitsubishi Kasei.
(B), # 40 (B), # 41 (B), # 44 (B),
# 45 (B), # 50, # 55, # 100, # 600,
# 2200 (B), # 2400 (B), MA8, MA1
1, MA100 and the like.

As overseas products, for example, Black Pearls 2, 46, 70, 71,
74, 80, 81, 607 etc., Regal 300, 3
30, 400, 660, 991, SRF-S, etc., Vul
Sterling 10, SO, V, can 3, 6, etc.
S, FT-FF, MT-FF and the like.

Further, Unit of Ashland Chemical Co., Ltd.
ed R, BB, 15, 102, 3004, 3006
3007, 3008, 3009, 3011, 3012
XC-3016, XC-3017, 3020 and the like, but are not limited thereto.

These light-shielding substances are added in an amount of 4% by weight to 30% by weight.
As a means for providing the contained resin on a paper support, the
There are two ways.

As one of the methods, there is a method in which a liquid obtained by dispersing or dissolving a resin in an organic solvent or water or the like is applied to paper and fitted. The application method can be, for example, a reverse swirl method, a blade method, an air knife method, a rod method, a curtain method, an extrusion method, or a gravure method, but is not limited thereto. The dry film thickness of the resin layer obtained by these methods is 1 μm.
m to 25 μm is appropriate.

As a second method, there is a method in which a resin is melted by heat and provided on a paper support. As an application method, an extrusion method is generally used, but other application methods may be used. The dry film thickness of the resin layer obtained by this method is suitably from 5 μm to 60 μm.

As a last method, a uniform film is formed into a film having a thickness of 20 μm to 40 μm by an inflation method, a T-die method, a casting method, and a roll method.
This is a method of dry laminating and fixing with an adhesive of 1 to 3 g / m ² such as a polyurethane-based or polyether-based adhesive, but the light-shielding paper used in the present invention may be prepared by any method.

Characters and symbols necessary for the function on the surface of the light-shielding paper,
Alternatively, printing is performed to increase the commercial value, but as the ink used in these printings, those harmless to photosensitive materials are generally used. Typical synthetic resins are vinyl chloride and acetic acid. Vinyl copolymer resin, nitrified cotton,
Polyester, polyamide urethane, polyacryl, rosin-modified maleic acid, ethylene vinegar, vinyl ether, urethane vinegar, salt vinegar biurethane resin, modified alkyd resin, modified phenol resin, alkali-soluble resin (rosin-modified maleic resin, styrene Maleic acid resin, styrene acrylate resin, acrylate acrylate resin, methacrylate acrylate resin), hydrosol type resin (styrene maleate resin, styrene acrylate resin, α-methyl styrene acrylate resin, acrylate acrylate) Acid resin, methacrylate acrylate resin), emulsion type resin (styrene resin, styrene acrylate resin, acrylate copolymer resin, methacrylate copolymer resin), resin for UV ink Polymers having an acrylic unsaturated group are generally used, and typical examples are polyester / acrylate, polyester / urethane resin / acrylate, epoxy resin / acrylate, pentaerythritol Examples include triacrylate, trimethylolpropane triacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, triethylene glycol diacrylate, and hydroxyethyl methacrylate.

Further, generally known coloring agents are used in combination with these inks. Examples of the coloring agent used include various pigments and azo pigments described in JP-A-63-44653 (Azo Lake; Carmine 2B, Red 2B, insoluble azo; monoazo yellow (PY-1, -Y).
3), disazojero (PY-12, -13, -14,
-17, -83), pyrazolo orange (PO-B-3)
4), Vulcan orange (PO-16), general azo type;
Chromophthaluiero (PY-93, -95), Chromophthal Red (PR-144, -166)), polycyclic pigment (phthalocyanine-based; copper phthalocyanine blue (PB-
15, -15-1, -15-3), copper phthalocyanine green (PG-7), cyoxazine type; cyoxazine violet (PV-23), isoindolinone type; isoindolinone yellow (PY-109, -110) Perylene, perinone, flavanthrone, thioindigo, lake pigments (malachite green, rhodamine B, rhodamine G, Victoria blue B) and inorganic pigments (oxide, titanium dioxide, red iron, sulfate); precipitated barium sulfate, Carbonate; precipitated calcium carbonate, silicate;
Hydrated silicate, anhydrous silicate, metal powder; aluminum powder, bronze powder, zinc dust, carbon black, graphite, navy blue and the like. These pigments may be added as a light-shielding substance to the above-mentioned resin layer, paper layer and the like. In addition, oil-soluble dyes, dispersible dyes and the like are also used). In addition, various solvents, dispersants, wetting agents, defoamers, leveling agents, thickeners, stabilizers, as necessary, as raw materials constituting the ink,
Additives such as a cross-linking agent, wax, and dryer are used.

Further, a protective layer (also called a lacquer coat layer or a varnish) may be applied for protecting the gloss of the surface and the printed portion on the surface. Examples of the type of the protective layer used at this time include acrylic resins, cellulose resins such as cellulose acetate, urethane resins, epoxy resins, polyester resins, ionomer resins, EEA resins, and various polyethylene resins (low density, high density, low linearity). An appropriate resin such as a density polyethylene or the like) or a polypropylene resin can be used. Also, wax and the like can be used.

Another characteristic of the light-shielding paper is rigidity. When the camera is loaded, a certain degree of rigidity is required from the viewpoint of operability such as insertion into the spool slit portion, but flexibility is required from winding up and loosening after winding.
Therefore, the rigidity is 100 in Gurley-type flexibility.
mgf to 200 mgf, preferably 120 mgf to 16
0 mgf is preferred.

As the resin for the spool used in the present invention, a polystyrene resin is generally used in view of strength, heat resistance, dimensional stability, appearance and the like. Synthetic rubber such as butadiene rubber is used as a styrene monomer. Even if a polymerized high-impact polystyrene resin (hereinafter referred to as HIPS) or a resin obtained by blending a medium-impact polystyrene resin (hereinafter referred to as MIPS) and a general-purpose polystyrene resin (hereinafter referred to as GPPS) is used, HIPS or MIPS alone resin is used. Alternatively, a resin in which GPPS and rubber are blended may be used. Preferred is a case where a resin obtained by blending HIPS and GPPS is used or a case where a resin of MIPS alone is used, and the impact resistance and the abrasion resistance are improved.

The amount of rubber to be added is 0.5 to 6.0% by weight depending on the price, physical strength, injection moldability, surface strength (to prevent scratches and abrasion), appearance, and the like. If the amount of rubber is less than 0.5% by weight, there is a problem in securing physical strength and surface strength. If the amount of rubber exceeds 6.0% by weight,
There is a problem in injection moldability, rigidity, appearance, price, etc., and it cannot be put to practical use.

As the polymerization method most commonly used at present, bulk polymerization in which monomers are used alone without using a solvent or dispersant used in JP-A-64-91136, or generally, An irregular bulk polymerization method in which an industrialized monomer, catalyst, and a small amount of a solvent are added, or a medium in which the monomer is not dissolved at all or hardly soluble (mainly water) is dispersed in the medium. Any of three polymerization methods, namely, suspension polymerization in which polymerization is carried out using a polymerization initiator which is hardly soluble in a monomer and which is easily soluble in a monomer, may be used.

Since the brownie spool protects the photosensitive film, which is fogged by light, from light together with the light-shielding paper, it naturally needs to have light-shielding properties. Representative examples of the light-shielding substances are described below.

(1) Inorganic Compound Oxides: silica, diatomaceous earth, alumina, titanium oxide, iron oxide, zinc oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon, alumina fiber, etc. Hydroxide: aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, etc. Carbonates: calcium carbonate, magnesium carbonate,
Dolomite, Dawn Night, etc. (Sulfite): calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, etc. Silicates: talc, clay, mica, asbestos, glass fibers, glass balloons, glass beads, calcium silicate, montmorillonite, bentonite, etc. Carbonic acid: carbon black, graphite, carbon fiber, carbon hollow sphere, etc. Others: iron powder, copper powder, lead powder, tin powder, stainless powder, var pigment, aluminum powder, molybdenum sulfide, zeolite, polon fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, Zinc borate,
Barium metaborate, calcium borate, sodium borate, aluminum paste, etc.

As a light-shielding substance used for the spool of the present invention, when used, photographic light-sensitive materials are less likely to generate fog, have less change in sensitivity, have a large light-shielding ability, and are hardened even when added to polystyrene resin. (Butsu)
Carbon black is preferable in that the generation of hardly occurs.

Examples of classification according to the raw material of carbon black include gas black, furnace black, channel black, anthracene black, acetylene black, Ketjen carbon black, thermal black,
There are lamp black, oil smoke, pine smoke, animal black, vegetable black and the like. In the present invention, furnace carbon black is desirable for the purpose of ensuring light-shielding properties, improving cost, improving physical properties, and not adversely affecting photographic characteristics. As an expensive light-shielding substance having an antistatic effect, acetylene carbon black and irregular by-products are used. Ketjen carbon black, which is carbon black, is desirable.

Among carbon blacks, pH (JIS)
K is measured by K 6221), preferably from 6.0 to 9.0, more preferably from 6.5 to 8.5, and the average particle diameter (measured by electron microscopy) is from 10 to 120 µm, particularly preferably from 12 to 70 µm. Among them, especially volatile components (JIS K 622)
1) is 3.5% or less, most preferably 1.5% or less, and the DBP oil absorption (measured by the oil absorption A method of JIS K 6221) is 50 ml / 100 g or more, most preferably 7 or more.
Furnace carbon black of 0 ml / 100 g or more. Channel carbon black is expensive, and most of them have a volatile component exceeding 5.0%, and most of them cause fogging on photographic light-sensitive materials, which is not preferable. Most lamp blacks having a pH of 5.0 or less adversely affect the photographic properties. Therefore, even when it is necessary to use the lamp black, the influence on the photographic properties should be investigated and selected. Further, unless the sulfur component is determined to be 0.9% or less, preferably 0.7% or less according to the measurement method of ASTM D 1619-60, photographic properties are adversely affected. In particular, the free sulfur component is 0.
It is preferred to select ones of 1% or less, most preferably 0.05% or less.

Preferable actual products of carbon black include, for example, carbon black # 20 (B), #
30 (B), # 33 (B), # 40 (B), 44 (B), # 45 (B), # 50, # 55, # 100, # 60
0, # 2200 (B), # 2400 (B), MA8, MA11, MA100, etc. Overseas products include, for example, Cabot Black
Pearls 2, 46, 70, 71, 74, 80, 81, 607, etc., Regal 300, 330,
400,660,991, SRF-S etc., Vulcan 3,6 etc., Sterling 10, SO,
V, S, FT-FF, MT-FF, etc. In addition, Ashland Chemical's Uniteel R, BB, 15,102,3001,3004,300
6,3007,3008,3009,3011,3012, XC-3016, XC-3017,3020 and the like, but are not limited thereto.

The amount of furnace carbon black added was
From the viewpoints of price, securing the physical strength of the spool, securing light-shielding properties, preventing photographic adverse effects, injection moldability, appearance, etc., from 0.05 to
3.00% by weight is desirable. If the addition amount of the furnace carbon black is less than 0.05% by weight, the light shielding property cannot be secured and light fog occurs unless the thickness of the spool is increased. If the wall thickness is increased and 0.05% by weight is attempted to secure the light-shielding property, the molding cycle becomes longer, molding failure such as sink occurs, and the amount of resin used increases, resulting in an increase in cost. If the carbon content exceeds 3.00% by weight,
In addition to being expensive, the physical strength of the spool is reduced and a weld line is generated. Further, not only is it easy to absorb moisture, causing photographic adverse effects, but also poor appearance of the spool (silver stripes, uneven gloss, reduced gloss), scratches and abrasion on the spool surface are likely to occur. Further, the fluidity of the resin deteriorates and the injection moldability also decreases.

As the dispersant for the light-shielding substance, one or more selected from low-molecular-weight styrene-based polymers, polyethylene wax, polypropylene wax, and derivatives thereof, ethylene bisamides, and metal soaps Is used. Preferably, zinc stearate or magnesium stearate is used. Carbon black-containing masterbatch pellets can contain a dispersant to such an extent that no adverse effects are caused by the addition of the dispersant, but in the case of zinc stearate, the final molded article is 0.01 to 0.3.
% Is preferable, and when it exceeds about 0.3% by weight in the final molded product, the gloss of the final molded product and swelling (sweating) on the mold at the time of molding are increased, and there is a possibility of causing a foreign matter adhesion failure to the molded product. When zinc stearate is 0.01% by weight or less, the effect is not sufficiently exhibited.

Further, a lubricant may be added to the spool of the brownie film to improve the sliding property with respect to the light-shielding paper side end, and to further improve the effect of preventing the winding up. Specific examples of the lubricant include the following.

(1) Fatty acid amide-based lubricant (saturated fatty acid amide-based lubricant) Behenic acid amide-based lubricant; Diamid KN (Nippon Kasei) and other stearic acid amide-based lubricants; Armide HT (Lion Fat), Alflo S-10 (Japan Fatty acid Amamid AP-1 (Nippon Kasei), Amide S. Amide T (Nitto Chemical), Neutron-2 (Nippon Seika), etc. (Hydroxystearic amide lubricant) Palmitic amide lubricant; Neutron S -18
(Nippon Seika), Amide P (Nitto Chemical), etc. Lauric amide-based lubricant; Armide C (Lion
(Akzo), Diamid (Nippon Kasei), etc. (Unsaturated fatty acid amide-based lubricants) Erucamide amide-based lubricants; Alflow P-10 (Nippon Oil & Fats), Neutron-S (Nippon Seika), LUBROL
(ICI), Diamid L-200 (Nippon Kasei)
Oleic acid amide lubricants; Armoslip CP (Lion Akzo), Neutron (Nippon Seika), Neutron E-18 (Nippon Seika), Amide O (Nitto Chemical),
Diamid O-200 / Diamid G-200 (Nippon Kasei), Alflo E-10 (Nippon Yushi), fatty acid amide O (Kao), etc. (Bis fatty acid amide lubricant) Methylene bisbehenic amide lubricant; Mid NK bis (Nippon Kasei), etc. Methylene bis stearamide amide lubricant; Diamid 200 bis (Nippon Kasei), Armowax (Lion Akzo), Bisamide (Nitto Chemical), etc. Methylene bis oleamide amide lubricant; Lubron O
(Nippon Kasei) etc. Ethylene bis stearamide amide lubricant; Armoslip EBS (Lion Akzo) etc. Hexamethylene bis stearamide amide lubricant; Amid 65 (Kawaken Fine Chemical) etc. Hexamethylene bis oleamide amide lubricant; Amide 60 (Kawaken Fine Chemical), etc. (2) Nonionic surfactant-based lubricant; Electrostripper TS-2, Electrostripper TS-3 (Kao Soap), etc. (3) Bicarbonate-based lubricant; Liquid paraffin, natural paraffin, microwax, synthetic paraffin, polyethylene wax (molecular weight of 6000 or less is preferable), (preferably molecular weight of 6000 or less) polypropylene wax, chlorinated hydrocarbon, fluoro carboxylic, etc. (4) fatty acid lubricants; higher fatty acids (C ₁₂ or more, specifically Is a turnip Acid, stearic acid, oleic acid, erucic acid, palmitic acid, etc.), oxy fatty acids, etc. (5) Ester lubricants; lower alcohol esters of fatty acids, polyhydric alcohol esters of fatty acids, polyglycol esters of fatty acids, fatty alcohols of fatty acids Esters, etc. (6) alcohol-based lubricants; polyhydric alcohols, polyglycols, polyglycerols (7) metal soaps: lauric acid, stearic acid, succinic acid, stearyl lactic acid, benzoic acid, hydroxystearic acid, lactic acid, phthalic acid, ricinoleic acid , Naphthenic acid, oleic acid, palmitic acid, higher fatty acids such as erucic acid and L
i, K, Na, Mg, Ca, Sr, Ba, Zn, Cd,
Examples include compounds with metals such as Al, Sn, Pb, and Cd, and preferred are magnesium stearate, calcium stearate, zinc stearate, and magnesium oleate. (8) Partially saponified montanic acid ester (9) Silicone-based lubricant; various grades of dimethylpolysiloxane and its modified products (Shin-Etsu Silicone, Toray Silicone)

Preferably, organopolysiloxanes having a dimethylpolysiloxane structure having a viscosity of 1,000 to 60,000 CS are added in the range of 0.05 to 2.20% by weight.

Various additives can be appropriately added to the resin used for the spool. Specifically, an antioxidant, a light stabilizer, an ultraviolet absorber, a nucleating agent, an antistatic agent, or alumina, kaolin, clay, calcium carbonate, mica, talc, titanium oxide, A filler such as silica or the like, or a reinforcing agent such as glass roving, metal fiber, glass fiber, glass milled fiber, or carbon fiber may be added.

The present invention is, of course, not limited by the respective shapes and dimensions of the locking claws, the side claws, and the light-shielding paper holding ribs of the embodiment described above. For example, although the shape of the light-shielding paper holding rib 42 is substantially a triangular pyramid, the shape may be a half of a conical shape. Further, the edge of the engaging claw facing the opening is a slope having one or two kinds of inclination angles. However, the present invention is not limited to this, and three or more kinds or a gentle curve, for example, an arc shape may be used. Good. In this case, the inclination angle θ is the angle of a tangent at the contact point P.

[0097]

As described above, according to the photographic roll film of the present invention, at least one locking hole is formed in the leading end of the light-shielding paper, and the upper wall of the slit of the spool is formed.
A locking claw with horizontal claws is formed, and a light-shielding paper holding rib that presses the light-shielding paper against the upper wall is formed on the lower wall, so it is possible to reliably shield light with extremely simple operation just by inserting the light-shielding paper into the slit of the spool. the paper can be locked to the spool, one
The light-shielding paper engaged with the hook locking claw does not come off easily,
Reliable film winding by subsequent spool rotation
It is also possible to easily achieve film loading automation.

When the height of the light-shielding paper pressing rib is set to be larger than the value obtained by subtracting the thickness of the light-shielding paper from the distance between the apex of the locking claw and the facing wall, the surface of the light-shielding paper is adjusted. Since the locking claw always comes into contact with the locking claw, the locking hole of the light-shielding paper and the locking claw are more reliably engaged .

The cross-sectional shape perpendicular to the axial direction of the winding axis of the locking claw and the light-shielding paper pressing rib is substantially symmetrical with respect to a straight line perpendicular to the wall constituting the slit and passing through the center of the cross-section. The edge of the locking claw and the slit of the light-shielding paper holding rib facing the opening is inclined with respect to the upper and lower wall surfaces,
Since the inclination angle θ of the edge of the locking claw at least in the vicinity of the base of the horizontal claw satisfies the formula tan θ ≧ t / (ef), the spool rotates after the locking hole engages with the locking claw. When the light-shielding paper is moved relatively to the spool, the light-shielding paper moves along the edge of the locking claw, and the locking hole is securely engaged with the lateral claw.

Further, since the horizontal claws are provided inside the edge of the locking claws, when inserting the light-shielding paper into the slit of the spool, the light-shielding paper can be moved to a predetermined position without catching the leading end of the light-shielding paper on the horizontal claws. It can be inserted securely. Also, since the edge of the side claw facing the light-shielding paper insertion direction is formed in a curved shape,
The light-shielding paper can be reliably inserted to a predetermined position without hooking the leading edge of the light-shielding paper to the edge of the horizontal claw.

The shape of the leading end of the light-shielding paper is narrower toward the leading end, and the leading end of the light-shielding paper is inserted into the slit. When the abutment with the two ends of the locking hole is made so that the center of the locking hole of the light-shielding paper is located substantially at the center of the locking claw, the locking hole and the locking claw are aligned. The insertion amount of the light-shielding paper until it is engaged, that is, the feed amount can always be kept constant, which can contribute to automation of film loading.

A locking claw is provided at the center of one wall in the axial direction, and a pair of light shielding paper pressing ribs are formed on the other wall with the locking claw as a center. It consists of a narrow part formed narrower than the width of the light shielding paper over the length and a trapezoidal part with both side edges inclined following this, the width of the narrow part is narrower than the interval between the light shielding paper pressing ribs, and The length of the narrow part is longer than half of the cross-sectional width perpendicular to the axial direction of the slit, so when inserting the light shielding paper into the slit of the spool, the narrow part is secured on both sides by the light shielding paper holding ribs And guided for a long time. This allows the light-shielding paper to be inserted straight into the slit without the center in the width direction of the light-shielding paper deviating from the center in the longitudinal direction of the slit, so that the engagement between the locking hole and the locking claw is ensured. be able to.

Also, since the surface of the light-shielding paper pressing rib facing the locking claw protrudes in a convex shape toward the locking claw and is inclined so as to become thinner toward the vertex, the center of the leading end of the light-shielding paper is formed. Is inserted out of the center of the slit, the side edges of the light-shielding paper are pushed toward the center by the inclined surface of the light-shielding paper holding rib, and the insertion path of the light-shielding paper is automatically corrected to the center. Thus, the engagement between the locking hole and the locking claw can be reliably performed.

In addition to the slit provided with a locking claw and a light-shielding paper pressing rib on the shaft of the spool, a slit having a flat inner wall surface used at the time of manufacturing is provided, so locking holes are provided at both ends. It can also be used with light-shielding paper. In addition, since a groove concentric with the shaft is formed on the inner wall of the flange of the spool, even if there is some variation in the width size of the light-shielding paper or meandering at the time of winding, it may cause the winding to become thick or the light-shielding property to deteriorate. And the photo film can be securely wound around the shaft.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a spool showing a locking claw and a light-shielding paper pressing rib according to the present invention.

FIG. 2 is an explanatory diagram showing an appearance of a spool and a state in which a leading end of a light-shielding paper is automatically inserted into a slit of the spool.

FIG. 3 is a plan view of a photographic film with light-shielding paper according to the present invention.

FIG. 4 is a side view of the spool showing a state in which a locking hole of a light-shielding paper is engaged with a locking claw of the spool.

FIG. 5 is an explanatory diagram showing a size relationship between a locking claw of a spool and a light-shielding paper holding rib.

FIG. 6 is an explanatory view showing a state in which the leading end of the light-shielding paper is inserted into a slit of a spool from a plane parallel to the light-shielding paper surface.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 4, showing a state in which the locking hole of the light-shielding paper is engaged with the lateral claw of the locking claw, from a direction perpendicular to the axial direction.

FIG. 8 is an explanatory view showing a state in which the spool is slightly rotated from the state shown in FIG. 6 and the locking hole is engaged with the horizontal claw of the locking claw, from a plane parallel to the light-shielding paper surface.

FIG. 9 is a partial sectional view of a flange showing a shape of a groove.

FIG. 10 is a partial cross-sectional view showing a state in which a 220 type photo film is wound around the same spool shown in FIG.

FIG. 11 is a plan view showing a 220-type photographic film.

FIG. 12 is a plan view showing a 120 type photographic film in which two locking claws are formed.

FIG. 13 is a perspective view of a main part of a spool in which an inner wall surface of a light-shielding paper pressing rib is formed in a convex shape.

FIG. 14 is an explanatory diagram showing the operation of the light-shielding paper holding rib shown in FIG.

FIG. 15 is an explanatory view showing various shapes of the horizontal nail.

FIG. 16 is an explanatory view showing a state in which the leading end of the light-shielding paper is inserted far off the center of the slit.

FIG. 17 is a side view showing a spool in which two types of different slits are formed.

18 is a partial perspective view showing a configuration in one slit of the spool shown in FIG.

FIG. 19 is an explanatory diagram showing a size relationship of a configuration inside the slit shown in FIG. 18;

20 is a sectional view taken along the line IIX-IIX in FIG. 17;

FIG. 21 is a perspective view of a main part of a spool provided with two locking claws.

22 is a plan view of a photo film with light-shielding paper used for the spool of FIG. 21.

FIG. 23 is a side view showing a spool in which locking pawls and light-shielding paper pressing ribs having different shapes are formed.

24 is a sectional view taken along line GG of FIG. 23.

FIG. 25 is a perspective view showing the appearance of a photographic roll film.

FIG. 26 is a plan view of a conventional photo film with light-shielding paper.

FIG. 27 is a side view of a conventional spool.

FIG. 28 is a sectional view taken along line YY of FIG. 27;

[Explanation of symbols]

 1 Photographic roll film 2, 28, 33 Photographic film 3, 24, 34, 35 Shading paper 3a, 24a, 34a Tip 3b, 24b Rear end 5, 20, 50, 60 Spool 6, 21 Shaft 7, 22 Flange 8,23,51,52,63 Slit 10 Chucking groove 22a Groove 23a, 23d, 51b, 51c Opening 23b, 51a Upper wall 23c, 51d Lower wall 27,38 Engagement hole 30,41,55,61 Stop claws 30c, 30d, 41c, 41d Side claws 32, 42, 45, 56, 62 Light-shielding paper holding ribs 42a Ridge line

Continuation of front page (56) References JP-A-2-137842 (JP, A) JP-A-61-156033 (JP, A) JP-A-5-181232 (JP, A) JP-A-1-251030 (JP) JP-A-2-160231 (JP, A) JP-A-58-178145 (JP, U) JP-A-1-173739 (JP, U) JP-A-44-8856 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03C 3/00-3/02

Claims (10)

(57) [Claims] 1. A strip-shaped photographic film having a light-shielding paper fixed at least at a front end thereof, and a slit formed in an axial direction,
A photographic roll film comprising a spool having a cylindrical winding shaft around which the photographic film is wound in a roll shape, wherein at least one locking hole is perforated at a leading end of the light-shielding paper to constitute the slit. One of the upper and lower walls is formed with a locking claw that is engaged with the locking hole and has a lateral claw at an apex at an apex portion, and the other wall includes
A photographic roll film, wherein a light-shielding paper pressing rib for pressing a light-shielding paper inserted into the slit against the one wall is formed. 2. The height of the light-shielding paper pressing rib is larger than a value obtained by subtracting a thickness of the light-shielding paper from a distance between a vertex of the locking claw and the other wall facing the other. The roll film for photography described in the above. 3. The locking claw and the light-shielding paper pressing rib have a cross-sectional shape perpendicular to the axial direction of the winding shaft which is substantially symmetrical with respect to a straight line which is perpendicular to a wall constituting the slit and passes through the center of the cross-section. In addition, the edges of the locking claws and the light-shielding paper pressing ribs facing the openings of the slits are inclined with respect to the upper and lower wall surfaces, and the edges of the locking claws are inclined at least in the vicinity of the roots of the horizontal claws. 3. The photographic roll film according to claim 2, wherein the angle θ satisfies the following mathematical expression 1. Tanθ ≧ t / (e−f) where t: thickness of the lateral claw e: contact point between the edge of the locking claw and the edge of the locking hole when the locking hole is engaged with the locking claw Distance from the upper and lower wall surfaces of the slit to the base of the horizontal claw in parallel with the slit f: The direction parallel to the upper and lower wall surfaces of the slit from when the locking hole engages with the locking claw until the locking hole engages with the horizontal claw Travel distance 4. The photographic roll film according to claim 3, wherein the lateral claw is provided inside an edge of the locking claw. 5. The photographic roll film according to claim 4, wherein an edge of said horizontal claw facing the light-shielding paper insertion direction is formed in a curved surface. 6. The shape of the front end of the light-shielding paper becomes narrower toward the front end, and the front end of the light-shielding paper is inserted into the slit, and both side edges of the front end of the light-shielding paper are formed. The position of the locking hole is determined such that the center of the locking hole of the light-shielding paper is positioned substantially at the center of the locking claw when the abutment comes into contact with both ends of the slit. 2. The photographic roll film according to 1. 7. The locking claw is provided at an axial center of the one wall, and the light-shielding paper holding rib is formed on the other wall in a pair around the locking claw. The leading end of the light-shielding paper comprises a narrow portion formed narrower than the width of the light-shielding paper over a predetermined length, and a trapezoidal portion having both side edges inclined following the narrow portion, and the width of the narrow portion is 7. The photographic device according to claim 6, wherein the gap between the light-shielding paper pressing ribs is narrower, and the length of the narrow portion is longer than half the cross-sectional width perpendicular to the axial direction of the slit. Roll film. 8. A surface of the light-shielding paper pressing rib facing the locking claw is projected toward the locking claw, and is inclined so as to become thinner toward the apex. The photographic roll film according to claim 7. 9. A photographic roll film comprising: a strip-shaped photographic film having a light-shielding paper fixed at least at a leading end thereof; and a spool having a cylindrical winding shaft around which the photographic film is wound in a roll shape. At least one locking hole is drilled at the tip of the reel, and a first slit formed at the center of the reel and having a longitudinal direction parallel to the axial direction is formed on the reel. And a pair of second slits formed in parallel to the axial direction, wherein the upper and lower walls constituting the first slit are each formed in a planar shape, and one of the upper and lower walls constituting the second slit has Forming a locking claw to be engaged with the locking hole, and forming, on the other wall, a light-shielding paper pressing rib for pressing the light-shielding paper inserted into the second slit against the one wall side. Featured Photo Roll Ilm. 10. The opposite ends of the spool, the flange is integrally formed, before Symbol photographic roll film of claim 1, wherein the forming the shaft portion and the concentric grooves on the inner wall of the flange.