JPH02124564A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To easily load the cartridge in a camera by putting even the film tip part in a main body in a light-tight state. CONSTITUTION:The film cartridge 10 consists of a cartridge main body 13, a spool 1, and a film wound around the spool 11. The cartridge main body 13 consists of a nearly cubic body 15 which has a cylindrical pocket type storage part for storing the spool 11 and film 12 and a lid 14 which is fitted to the body 15 in an opening/closing state. Then, the cartridge 10 is stored in the cartridge main body 13 including even the tip part of the film 12. Consequently, the cartridge is easily loaded in the camera.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film cartridge that stores photographic film such as 35 mm in roll form.

[Conventional technology]

35mm - 35mm film, which is widely used for reflex cameras and compact cameras, is made by winding a film 2 around a resin spool 1 and then attaching it to a metal cartridge body 3, as shown in Figure 20. The film is rotatably housed in the film, and the leading end of the film is drawn out in advance from the film draw-out opening 3a. As known from Japanese Utility Model Publication No. 41-6297, a light-shielding member called, for example, terempu material is bonded to the inner surface of the film outlet 3a. In addition, this film drawer 1
3a, various proposals have been made in Japanese Patent Publication No. 433,416/2, Utility Model Publication No. 37-32164, etc., and proposals have also been made to make the cartridge body 3 made of resin to reduce weight (Japanese Patent Publication No. 433,416/2003) 55-21089) has also been made.

Furthermore, the photographic film cartridge described in U.S. Pat. No. 4,423,943 has a configuration in which even the leading end of the film is wound into the cartridge body, and the film can be fed out by rotating the spool in the film feeding direction. It is now possible to do so.

[Problem to be solved by the invention]

However, in the former type of photographic film cartridge, the leading edge of the film is pulled out from the film drawer opening 3a in advance when unused, so it is difficult for users to handle the leading edge of the film when loading the camera. I often get confused. Furthermore, in order to reliably maintain the light density inside the cartridge body 3 even when the leading edge of the film is completely rolled into the cartridge body 3 after shooting, it is necessary to improve the light-shielding properties of the film drawer opening 3a. . However, for this reason, when a terremp material with high light-shielding properties is used, there arises a problem that not only does the drawing resistance of the film increase, but also the film may be scratched.

Other disadvantages include the necessity to destroy the cartridge to take out the film during development.

Furthermore, the photographic film cartridge described in US Pat. No. 4,423,943 has the great advantage that even the leading edge of the film is rolled up inside the cartridge body, which simplifies the loading operation into the camera. However, in order to prevent the film inside the cartridge body from being exposed to light from the film drawer opening 3a, an opaque sheet is attached to the leading edge of the film, and this is wound around the film roll inside the cartridge body one or more times. Because we are
This not only complicates the manufacturing process of the film itself, but also increases unnecessary waste during development. Additionally, to ensure that the opaque sheet covers the outermost periphery of the film roll,
It is necessary to have a pair of collars integrated into the spool with flanges that protrude to face each other, and the cartridge body and spool must be finished with high precision.
It is also disadvantageous in terms of man-hours and manufacturing costs.

[Object of the Invention] The present invention has been made in order to solve the problems of the conventional photographic film cartridge as described above. To provide a photographic film cartridge capable of saving time and man-hours and improving workability during development processing.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a spool, a film wound around the spool and having a terminal end locked to the spool, and a light-shielding cartridge that rotatably accommodates the spool around which the film is wound. a main body, a film passage formed in the cartridge body for drawing out the film, and a leading end holding means for holding the leading edge of the film in or near the film passage within the cartridge body;
The photographic film cartridge comprises a film feeding means for transmitting the rotation of the spool to the film and sending the leading end of the film out of the cartridge main body through the film path when the spool is rotated in one direction.

In addition, a film drawer opening is formed in the cartridge main body, and the opening/closing means is opened or closed by an opening/closing means, and the opening/closing means is opened only when the cartridge main body is loaded into the camera, and the spool is rotated in this state. It may also be configured such that the leading end of the film is sent out from the film outlet.

Furthermore, it is also an effective means to achieve the object of the present invention by forming the film passage communicating with the film outlet in an arc shape and applying anti-reflection treatment to the inner surface thereof. Then, if a light-shielding elastic body with a biasing force toward the other wall surface is added to at least one of the wide walls of the film passage near the film exit formed in the main body of the cartridge or connected to the film exit. This is effective in preventing light leakage from the film outlet.

The material for the main body of the cartridge is preferably a resin containing a light-shielding substance, and a lubricating agent, such as silicone oil having a dimethylpolysiloxane structure, is added in an amount of 0.05 to 5.0% by weight to this resin. is desirable.

[Function] In the photographic film 18 cartridge of the present invention, even the leading end of the film is housed within the cartridge body, making it easy to load the film into the camera. After loading the camera,
The film is fed out by rotating the spool around which the film is wound in the film feeding direction.

In addition, in cases where the film drawer opening provided on the cartridge body can be opened and closed using an opening/closing means, the opening/closing means opens only when the film is loaded into the camera, allowing the film to be fed out by rotating the spool, and the cartridge can be removed from the camera. When the film is taken out, the opening/closing means moves to the closed position, and light leakage from the film outlet is reliably blocked.

Hereinafter, some embodiments of the present invention will be described according to the drawings.

〔Example〕

In FIGS. 1 and 2 showing the external appearance and a broken state of main parts of a film cartridge to which the present invention is applied, a film cartridge 10 includes a cartridge main body 13, a spool 11.
It consists of a film 12 wound around a spool 11. The cartridge main body 13 is composed of a substantially rectangular parallelepiped box-shaped body 15 in which a cylindrical pocket-like storage part for storing the spool 11 and the film 12 is formed, and a lid 14 attached to the body 15 so as to be openable and closable. The negative side of M14 is joined to the body 15 by ultrasonic welding, but the second
The figure shows the state before the lid 14 is attached.

As shown in FIGS. 6 to 9, a rectangular opening 15a is provided on the upper surface of the body 15, and an eave-like protrusion 16 is integrally formed so as to protrude from the negative side of the rectangular opening 15a.

A locking protrusion 17 is provided on the upper surface of the eave-like protrusion 16, and engages with a locking hole 39 formed at the leading end of the film 12 to lock the leading end of the film 12, as will be described in detail later. Further, a groove 21 is formed on the root side of the eave-like protrusion 16, and steps 20 are formed on the other three sides surrounding the opening 15a.
is formed.

An opening 19 is formed in one side 22 of the body 15 to rotatably receive the drive boss 18 of the spool 11. Further, thin notches 24.25 are provided on the side surface 2223 of the body 15 so as to be located on both sides of the eave-like protrusion 16, and a protrusion protrudes from the notch 24.25. 25.26 are provided.

On the bottom surface of the lid 14, as shown in FIGS. 1O to 14, there is a locking protrusion 17 provided on the body 15. Groove 21
A recess 28 and a protrusion 29 are formed at positions corresponding to . Furthermore, the lid 14 is provided with ears 30 and 31 that protrude toward the lower surface, corresponding to the notches 24 and 25 formed on both side surfaces 22 and 23 of the body 15. Furthermore, this ear portion 30.
31 has holes 32.33 at positions that fit with protrusions 26.27.
is formed.

As shown in FIGS. 3 to 5, the spool 11 is
It has a drive boss 18 inserted into the opening 19 of the body 15 at one end, and flanges 34 and 35 are integrated at both ends so as to maintain a spacing slightly wider than the width of the film 12.

An annular thin wall portion 36 is formed on the end face of this one flange 35, and this has a smaller diameter than an annular protrusion 37 formed on one side inner wall of the body 15.

As briefly illustrated in FIG. 18, the film 12 has well-known perforations formed along both side edges, and a locking hole 38 for locking the spool 11 on the terminal end side.
A locking hole 39 that is captured by the locking protrusion 17 is provided on the tip side.

When assembling the film cartridge, first install film 1.
The spool 11 wound with 2 is stored in the body 15. At this time, since the flange 34 is located inside the opening 19, light from between the opening 19 and the drive boss 18 does not enter into the body 15. Also, at this time, film 1
The locking hole 39 at the tip of the body 15 is engaged with a locking protrusion 17 formed on the eave-like projection 16 of the body 15.

Spool 11. After storing the film 12 in the body 15,
The lid 14 is placed over the opening 15a of the body 15. A welded piece 40 is integrated with the rear end side of the lid 14, and this welded piece 40 is fitted inside the step 20. And fuselage 15
An ultrasonic horn is pressed from outside, and the welding piece 40 is ultrasonically welded to the inner wall of the body 15 at the lower part of the step 20.

In addition, the ears 32 and 33 of i14 are connected to the notches 24 of the body 15.
．． 25 and the protrusion 26.27 engages the hole 32.33. In this state, as shown in FIG. 19, the lid 14 is in close contact with the eave-like protrusion 16, the locking protrusion 17 is fitted into the recess 28, and the protrusion 29 is fitted into the groove 2. Intrusion is reliably prevented.

When the film cartridge 13 configured as described above is loaded into the camera and the back cover of the camera is closed, the cover release mechanism provided on the camera side is activated, and a release pin is inserted into the holes 32 and 33 of the cover 14 from the camera side. (not shown) enters. When this release pin is moved in two directions, the engagement between the hole 32.33 and the protrusion 26.27 is released, and the lid 14 is elastically deformed and becomes open as shown in FIG. A film outlet is formed.

Thereafter, when the film feeding mechanism on the camera side is activated, the drive boss 18 of the spool 11 is first pressed by a cam or the like on the camera side, thereby moving the spool 11 from the position shown in FIG. 15 to the position shown in FIG. 16. Move to. The spool 11 moves, and the outer circumferential side of the flange 35 on the one side moves to the body 15.
When pressed against the annular protrusion 37 formed on the inner surface of the flange 35, the flange 35 deforms at the annular thin-walled portion 36 and becomes inclined inward. As a result, both side edges of the film 12 wound around the spool 11 are formed by the flange 24 and the flange 35.
sandwiched between. Thereafter, when the drive boss 18 is driven in the film feeding direction via the camera's feeding mechanism, the locking hole 39 at the leading end of the film 12 and the cartridge body 13
The locking with the locking protrusion 17 is released, and the leading end of the film 12 is sent out to the outside of the cartridge. Thereafter, the film 12 is fed by a well-known sprocket I or a take-up spool provided on the camera.

It should be noted that if the configuration is such that the pressure on the drive boss 18 is released after the leading end of the film 12 is wound around the take-up spool of the camera, the load for pulling out the film 12 can be reduced.

When the photographing is completed and the film 12 is rewound into the cartridge main body 13, the locking hole 39 at the leading end of the film is captured by the locking protrusion 17 again. Then, by the initial operation of opening the back cover of the camera, the release bottle on the camera side is lowered through the holes 32 and 33 and then removed. As a result, lid 1
4 is restored to the closed state, and the interior of the main body 13 is again maintained in a light-tight state. In this way, if the leading end of the film does not protrude from the cartridge main body 13 when loading into the camera, even an inexperienced user can easily perform the loading operation as if handling a battery or a cassette. Furthermore, even during development processing, the leading end of the film can be fed out by opening the lid 14 and rotating the spool 11, thereby eliminating the work of disassembling and destroying the cartridge as required in the past.

Regarding the film cartridge 13, the body 15
．． Lid 14. The spool 11 is made of a styrene resin molded product, and its external dimensions are 14 mm x 14 mm x 42 mm (the volume is approximately 8 mm).
．． 1 cubic cm), and when a Leica 12-shot photographic film was used as film 13, its weight was 8.6
g, making it smaller and lighter than the current Fujicolor HR (product name), which takes 12 shots (volume: 21.6 cubic cm, weight: 16.2 g).

In the above embodiment, the spool 11 is pressed from the drive boss 18 side to tilt the flange 35 inward, thereby sandwiching the film 12 between it and the other flange 34 and transmitting the rotation of the spool 11 to the film 12. However, in order to transmit the rotation of the spool 11 to the film 12 during film feeding, it is also possible to adopt the structure shown in FIGS. 21 to 23.

In the embodiment shown in FIG. 21, a protrusion 42 is formed on the inner wall of one side 23 of the body 15 in addition to four parts 41 for receiving the end of the spool 11. When the spool 11 is stored in the body 15, the protrusion 42 is attached to one flange 44.
The - part is inclined inward. Therefore, in this embodiment, there is no need to press the spool 11 from the drive boss 18 side before feeding out the film 12 (the film 12 can be fed out simply by rotating the spool 11. Also, the protrusion 42 Since it makes sliding contact with the flange 44 at the facing portion, it is more advantageous in reducing friction during rotation of the spool than a method that makes sliding contact with the entire circumference of the flange 44.

The embodiment shown in FIG. 22 shows an example in which the other flange 46 is also deformed by a projection 47, and the embodiment shown in FIG. It shows what has become.

Further, the body 15 and lid 14 of the patrone main body 13,
When the spool 11 is molded from styrene resin, a predetermined amount of dimethylpolysiloxane or carboxyl-modified silicone oil is added to the molding material together with a light shielding substance. By adding dimethylpolysiloxane or carbonyl-1-sil modified silicone oil, it not only provides lubricity and reduces friction even in cartridges with a film size of 35 mm or more.
At the time of ultrasonic bonding, adhesion between the bar I/Rone main body 13 and the spool 11 can be prevented without affecting the adhesion strength of the parts to be bonded.

If the amount of dimethylpolysiloxane or carboxyl-modified silicone oil added is increased, it may affect the molding cycle, increase the amount of silicone oil that seeps onto the cartridge surface, weaken the bonding strength with ultrasonic waves, or cause the silicone oil to seep onto the surface. The range of silicone oils that can be added to achieve the objective is limited because the oil transferred to the film in the cartridge causes problems such as preventing the development processing solution from diffusing into the film during film development. Furthermore, it was not possible to lower the frictional resistance with commonly used lubricants other than the silicone oil of the present invention.

That is, in the film cartridge of the present invention, the resin constituting the cartridge main body 13 and the spool 11 are both 0.05
% to 3.00% by weight of carbon black, and at least one of the resins contains 0.05% to 5.0% by weight of dimethylpolysiloxane or a silicone oil obtained by modifying the methyl group of dimethylpolysiloxane with a carboxyl group. It is something that

The resins used in the present invention include polystyrene, high-impact polystyrene, styrene-acrylonitrile copolymer resin,
Examples include ABS resin, polypropylene resin, high density polyethylene resin, etc., but are not particularly limited.

There are various types of carbon black that are added to ensure light-shielding properties and prevent static electricity. In terms of the average particle diameter of 10 to 80 m
Furnace carbon black having a μ and pH of 5 to 9 is preferred, and furnace carbon black having a pH of 15 to 50 mμ and a pH of 6 to 8 is particularly preferred. When the particle size of carbon black is less than 10 mμ, kneading properties with resin are poor and light blocking properties are obtained.

Physical strength deteriorates. On the other hand, if it exceeds 100 mμ, the dispersion may be good but the light blocking ability will be poor, and if the carbon concentration is increased to ensure the light blocking ability, the physical strength will decrease and the moldability will deteriorate, making it impractical.

Many of the carbon blanks with P H exceeding the above range,
It was unusable because it caused adverse photographic effects.

The amount of furnace carbon black added is limited to 0.05% by weight to 3.00% by weight from the viewpoint of ensuring light-shielding properties, injection moldability, and physical strength of the cartridge.

If the amount of carbon black added is less than 0.05% by weight, the light shielding property will be insufficient, and if it exceeds 3.00% by weight, the physical strength of the cartridge will decrease and the water absorption rate will increase, making it difficult to use during injection molding. Weld marks, silver streaks, etc. occur, causing poor appearance 1 and deterioration of surface strength.

In addition to the furnace type mentioned above, carbon blanks include
There are thermal types, channel types, etc., but these tend to cause adverse photographic effects and are unsuitable for use in photographic film cartridges.

In addition to carbon black, inorganic pigments or organic dyes such as titanium oxide, red iron oxide, and calcium carbonate may be used as the light-shielding substance.

The amount of dimethylpolysiloxane and carboxyl-modified silicone oil added is limited to 0.05% to 50% by weight, preferably between 1% and 3% by weight. 0
．． If it is less than 0.05% by weight, the desired slippery effect cannot be obtained;
If it exceeds 5.0% by weight, the resin will slip within the screw of the molding machine, not only prolonging the molding cycle, but also increasing the amount of silicone seeping onto the surface of the molded product, resulting in adverse photographic effects. Additionally, the adhesive force between the cartridge body and the lid decreases during ultrasonic sealing.

Also, the viscosity of silicone oil at 25°C is 1000~
60000C3 is preferable.

When the viscosity at 25°C is less than 100OC3, bleed-out is severe and photographic performance is adversely affected.

If it exceeds 60,000C3, the kneading properties with the resin will be poor and it will not be usable.

Various modified silicone oils other than those limited in the present invention, such as fluorine-modified silicone oil, are commercially available, but many of them have an adverse effect on photographic film, do not provide sufficient lubricity, or have injection molding properties. It could not be used for photographic film cartridges because of severe thermal decomposition.

0.5% by weight of carbon blank and dimethylpolysiloxane (KF-96 manufactured by Shin-Etsu Chemical) were added to impact-resistant polystyrene.
H130000C3) was added in an amount of 2.0% by weight, and a cartridge and a spool were molded by injection molding.

As comparative products, one that does not contain dimethylpolysiloxane (Comparative Crystal A) and one that contains 1.0% by weight of oleic acid amide, which is commonly used as a lubricant instead of dimethylpolysiloxane, were molded and their characteristics were determined. were compared and shown in Table 1.

[Table 1] The above examples regarding the molding material are representative examples of preferred embodiments of the photographic film J and cartridge of the present invention, but the present invention is not limited thereto. Moreover, the evaluation in the table is based on the following.

``Static friction resistance'' Static friction coefficient between injection molded test products with a width of 35 mm and a length of 75 mm ``Adhesion rate between spools and cartridges'' When 1000 spools and cartridges are combined and bonded using ultrasonic waves. Rate of adhesion of the cartridge In the above-mentioned embodiment, in order to maintain light tightness inside the barone body 13, the i14 is closed outside the camera and opened after being loaded into the camera. However, the present invention is not necessarily limited to using lit/I.

Figure 24 has a similar shape to a conventional cartridge,
This example shows an example in which the light-shielding lid 14 as in the above example is not used. The cartridge body 50 consists of a body 51 and side plates 52, 53, and the film 12 wound around the spool 11 is housed therein. On the inner surface of one side plate 52, a protrusion 55 is formed which has the same effect as the protrusion 42 shown in FIG. The flange 44 of the flange 44 is inclined inward to sandwich the film I2 between the flange 44 and the flange 46 of the other flange 46 .

Fuselage 51. Each of the side plates 52 and 53 is made of a resin molded product, and an arcuate guide passage 56 is formed inside the body 51, one end of which communicates with the film outlet 51a. The leading end of the film 12 is passed through this guide passage 56, as shown in FIG.

FIG. 26 shows a cross section of the guide passage 56.

The guide passage 56 consists of a wide passage 56a and a narrow passage 56b, and the narrow passage 56b contacts both side edges of the film 12 to support the film 12. Wide aisle 56a
Since it does not come into contact with the film 12, there is no risk of scratching the film 12.

Further, the surface of this wide passage 56a is a matte surface with many fine irregularities formed thereon. If the guide passage 56 is made into an arc shape in this way, and the surface of the wide passage 56a is made into a cloak surface, even if light enters from the film outlet 51a, it will be attenuated within the guide passage 56, and the light inside the cartridge main body will be attenuated. Fog does not occur on the film 12.

The width W1 of the wide passage 56a is set to 0.8 mm or less in order to maintain the light shielding function, and the width W2 of the narrow passage 56a is set to 0.2 mm to reduce frictional resistance during film feeding.
Further, the length of the arc-shaped portion of the guide passage 56 is preferably 5 mm or more. Furthermore, the light-shielding function can be further improved by dyeing the leading edge of the film with a light-shielding dye or by making knurls on the surface of the leading edge of the film to lower the reflection of the film itself. Of course, in this embodiment as well, the locking protrusion 17 is provided on one side of the guide passage 56 so that the engagement hole 39 at the tip of the film 12 is locked in the guide passage 56. good.

According to the above, since the film 12 is sandwiched between the flanges 4446 of the spool 11, if the spool 1 is driven in the direction of feeding out the film 1, the leading end of the film 12 is sent out from the film draw-out port 51a through the guide passage 56. be able to.

Furthermore, if the film is rewound after photographing, the engagement hole 39 at the leading end of the film is captured by the locking protrusion 17 in the guide passage 56. can be easily sent out of the cartridge.

In order to prevent light from entering through the film outlet and to maintain the leading edge of the film near the film outlet, it is also possible to apply the embodiment shown in FIG. 27. An elastic light-shielding piece 62 is provided on one inner surface of the film passage 61 that communicates with the film drawer 1] 60.
is fixed. As the light-shielding piece 62, for example, a plastic film sheet dyed with a light-shielding dye is used, and its own elasticity presses and clamps the tip of the film 12 between it and the other inner surface of the film passage 61. Therefore, light from the film outlet 60 does not enter the film passage 61.

Further, as shown in FIG. 28, a locking protrusion 64 that engages with a locking hole at the leading end of the film is provided in the film passage 61,
The leading end of the film may be locked by the locking protrusion 64 and the engagement hole 39, and the film pull-out opening 60 may be shielded from light by the film sheet 62.

Other examples of the light-shielding piece 62 that can be used for this purpose include a plastic sheet film laminated with a thin metal plate or metal foil, a plastic sheet film coated with metal vapor deposition, and a laminate of these. Further, it does not necessarily have to be in the form of a film. Further, the cross-sectional shape of the light shielding piece 62 may be a bent shape as shown in FIGS. 29 to 31.

In the previous embodiments, a flange is integrated with the spool, and the rotation of the spool is transmitted to the film via the flange to feed the film, but the feeding of the film is not necessarily limited to this.

For example, FIG. 32 shows still another embodiment of the present invention,
The figure (A) shows a cross section, and the figure (B) shows a longitudinal cross section. In this embodiment, an elastic member 72 made of sponge is fixed to the inner wall of a body 71 of a cartridge body 70, and a spool 1
1 is configured to press the film 12 wound around the spool 11 toward the spool 11. According to this, when the spool 11 is rotated in the film feeding direction,
The film 12 is no longer unwound from the spool 11, the rotation of the spool 11 is transmitted to the outermost film 12, and the leading end of the film 12 can be drawn out and sent out from the lower 3.

In addition, in order to reduce the frictional resistance between the elastic member 72 and the film 12, a lubricant layer 74 is formed on the surface of the elastic member 72, and the friction coefficient with the film 12 is μ, and the friction coefficient between the films 12 is μ2. In this case, if the relationship μ2≧μm is always maintained, good film feeding is possible.

The sponge used for the elastic member 72 is polyurethane with a thickness of 3 mm and a compression ratio of 50% (50 g/cm).
1 (at the time of pressing), and the one in which Mending Tape 810 manufactured by Sumitomo 3M Co., Ltd. was attached to the elastic member 72 as the lubricant layer 74 was good. Further, in this embodiment, in order to hold the leading end of the film 12 on the film drawer lower 3, a rod-shaped locking member 75 is fixed to the leading end of the film 12. Therefore, when the film 12 is wound in, the locking member 75 prevents the film 12 from being pulled in, and the film drawer lower 3 is shielded from light.

Similarly, in the embodiment shown in FIGS. 33(A) and 33(B), a leaf spring 78 is used as an elastic member for pressing the film 12 toward the spool 11. For example, silicon manganese steel with a thickness of 0.1 mm is suitable as a material to be used for this leaf spring 78, and as the lubricant layer 79 formed on the surface of the leaf spring 78, the above-mentioned mending tape 810 may be used.

In addition, it is also effective to adopt the following aspects when implementing the present invention.

b) In the photographic film cartridge according to claim 2, the film path is made into an arcuate path, and the inner surface thereof is subjected to a reflection reduction treatment.B) The photographic film cartridge according to claim 5 In this case, the lubricating agent is silicone oil having a dimethylpolysilonitozan structure, and its content is 0.0 in the resin.
5 to 5.0% by weight [Effects of the Invention] As explained in Section 2 below, according to the photographic film cartridge of the present invention, even the leading edge of the film is light-tightly housed within the cartridge body. , it becomes possible to easily load a film cartridge as if it were a cassette. In addition, even if the tip is completely stored in the cartridge body, the opening/closing means that remains closed outside the camera, the light-shielding elastic body provided in the film passage, and even the arc-shaped film J and the passage can prevent the cartridge from being closed. The interior of the main body can be maintained in a light-tight state.

Furthermore, after loading the photographic film cartridge of the present invention into a camera, the leading edge of the film is fed out of the cartridge body by rotating the spool, so that the leading edge of the film can be used as a film feeding mechanism on the camera side. This eliminates the need for a sprocket mechanism to capture and pull out the camera, which also has the effect of simplifying the structure of the camera.

Even if the film is rolled up to the tip into the cartridge body after shooting, the light-shielding properties are maintained well, and the film can be fed out by rotating the spool without disassembling the cartridge body during development processing.
Pretreatment during development is also much easier.

Furthermore, the photographic film type 1-Rone of the present invention can be molded with a resin containing a light-shielding substance, and in this resin, 0.05 to 5.0% by weight of a dimethylpolysiloxane structure is added as a lubricating agent. Each addition of silicone oil makes it possible to smoothly feed the film by 4 degrees without adversely affecting the molding process of the cartridge body or the photographic performance.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention. Figure 2 is a partially cutaway perspective view of the film cartridge shown in Figure 1 before the lid is removed (-1). Figure 3 is a front view of the spool. Figures 4 and 5 are These are a left side view and a right side view of the spool shown in Figure 3. Figure 6 is a plan view of the body of the cartridge body. Figure 7 is a front view of the cartridge body. Figures 8 and 9. The figures are a left side view and a left side cross-sectional view of the body of the cartridge body. Fig. 10 is a plan view of the lid. Fig. 11 is a front view of the lid. Fig. 121J and 13 are views of the lid. FIG. 14 is a bottom view of the lid. FIG. 15 is a partially cutaway vertical cross-sectional view of the main body of the cartridge. FIG. 16 shows the cartridge in a state where the flange of the spool is deformed. Fig. 17 is a left side view of the cartridge main body with the lid open and the leading edge of the film fed out. Fig. 18 is a partially broken view of both ends of the film. Fig. 19 is a partially enlarged left sectional view of the cartridge body. Fig. 20 is a perspective view of a conventional photographic film cartridge. Figs. 21 to 23 respectively show other embodiments of the present invention. Fig. 24 is an exploded perspective view showing still another embodiment of the present invention. Fig. 25 is a sectional view of main parts of the embodiment shown in Fig. 24. 26 is a cross-sectional view of a main part of the film path of the embodiment shown in FIG. 24. FIG. 27 is a cross-sectional view showing still another embodiment of the present invention. 27 is an enlarged sectional view of a main part near the film outlet of the embodiment shown in FIG. 27. FIGS. 29 to 31 are enlarged sectional views of main parts showing other configuration examples near the film outlet. 32(A) and (B) are a cross-sectional view and a longitudinal sectional view showing still another embodiment of the present invention. FIGS. 33(A) and (B) are They are a cross-sectional view and a longitudinal cross-sectional view showing examples. 10 ・ ・ ・ I Patrone lid body locking protrusion drive bosses 34, 35...Flange 36...Annular thin wall portion 37...Annular protrusions 42, 47...Protrusions 44, 46...Flange 50...Patrone body 51...Body 51a...Fill L, drawer port 56...Guide passage 60...Film drawer port 62...Light shielding piece 72...Elastic body 74...Lubricant layer 75...Relationship Stopping member 78...plate spring. Clam

Claims (5)

[Claims] (1) The exit opening of the film is closed outside the camera, and after the exit opening is formed inside the camera and subjected to image exposure, the exit opening is closed again and the film is taken out of the camera. 1. A photographic film cartridge having a structure, wherein the leading end of the film is held in advance near the exit opening before forming the exit opening. (2) A spool, a film wound around the spool and having its end locked to the spool, a light-shielding cartridge main body that rotatably accommodates the spool around which the film is wound, and a cartridge formed on the cartridge main body. a film path for drawing out the film; a leading edge holding means for holding the leading edge of the film in or near the film path within the cartridge body; and when the spool is rotated in one direction, the rotation of the spool is transmitted to the film. A photographic film cartridge comprising: a film feeding means for feeding the leading end of the film out of the cartridge body through a film passage. (3) A photographic film cartridge consisting of a spool, a film wound around the spool and having its end locked to the spool, and a light-shielding cartridge main body rotatably housing the spool around which the film is wound, an opening/closing means that forms a film drawer opening in a part of the cartridge body when opened, and maintains the inside of the cartridge body light-tight when closed; and the opening/closing means that is operated by a mechanism on the camera side when the cartridge body is inside the camera. opening/closing interlocking means for opening the opening/closing means and closing the opening/closing means when the cartridge main body is outside the camera; A photographic film cartridge characterized by comprising a film feeding means for feeding the leading end from a film drawer opening. (4) A spool, a film wound around the spool and having its terminal end latched to the spool, a light-shielding cartridge main body that rotatably accommodates the spool around which the film is wound, and a cartridge formed on the cartridge main body. a light-shielding elastic body provided on at least one of a film outlet and a wide wall surface of a film passage adjacent to the film outlet or connected to the film outlet and having a biasing force toward the other wall surface; and the spool. The photographic film cartridge is characterized in that it is provided with a film feeding means for transmitting the rotation of the spool to the film and feeding the leading end of the film out of the cartridge main body through the film drawer opening when the spool is rotated in one direction. (5) A spool, a film wound around the spool and having its end locked to the spool, a cartridge body that rotatably accommodates the spool around which the film is wound, and a film drawer formed in the cartridge body. the spool and the cassette main body; is made of resin containing a light-blocking substance,
A photographic film cartridge characterized in that at least a lubricity imparting agent is added to the cartridge body.