JP3327700B2 - Photo film patrone container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin container for storing a photographic film cartridge.

[0002]

2. Description of the Related Art A conventional 135 type photographic film patrone is one in which a photographic film is stored in a roll shape in a patrone body made of a thin metal plate. This photographic film patrone is stored in a photographic film patrone container called a P case, and further sold in small boxes (paper boxes). Photo film patrone container
It consists of a bottomed container body and a lid tightly attached to the open end of the container body, all of which are made of molded resin. And, it has a function of protecting the photographic film stored in the container body from moisture, and generally has a function of 5 to 10 mg.
High moisture-proof performance of / 24hour or less is required. The conventional photographic film patrone has an almost cylindrical shape, though the port part which is the entrance and exit of the photographic film is slightly protruded, so the horizontal cross-sectional shape of the photographic film patrone container is basically almost circular. It has become.
Therefore, when the lid is attached to the open end of the container body,
The inside of the container body can be sealed relatively easily.

On the other hand, as described in, for example, JP-A-5-127317 and JP-A-5-150402, a patrone body is made of a resin part and has a function of sending out a photographic film by rotating a spool. Known photo film patrone is known. In such a photo film patrone, the photo film is stored inside the patrone body including its tip when not in use, and its outer shape is slightly different from that of the conventional one in order to feed out the photo film tip and to shield the film entrance and exit. Is different. For example, as shown in the photo film cartridge 110 shown in FIG. 16, the port 110b is extended to shield the film entrance 110a from light, so that the overall shape cannot be said to be a cylindrical shape. When the photo film cartridge is stored in the container 120 for the photo film cartridge, wasteful spaces 120a and 120b are formed in the container 120, resulting in poor space efficiency.

Further, in addition to the shape of the photographic film cartridge itself, a plurality of them can be simultaneously stored or, for the purpose of design, a square type, a D type, or the like as described in JP-A-3-176371. 3-48
A container for a photographic film cartridge having an oblong horizontal cross section as described in JP-A-581 is known.

[0005]

However, the container for a photographic film cartridge described in the above-mentioned publication has a side surface of a container body formed of a flat surface and a cylindrical surface, and the horizontal cross section is formed by connecting an arc portion and a straight portion. It has become.
In the case of such a horizontal cross-sectional shape, when the lid is attached to the container body, it is easy to maintain tightness with the lid in the arc portion, whereas a gap is easily generated between the linear portion and the lid,
There is a drawback that the tightness is impaired and the moisture-proof performance is deteriorated as compared with a conventional cylindrical resin container. Also,
If ribs or the like are integrally formed on the lid as described in Japanese Utility Model Publication No. 3-48581 to prevent this, unevenness due to sink occurs on the surface to be mounted on the container body, and it is still impossible to secure sufficient moisture-proof properties.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has a photographic film cartridge container capable of reliably maintaining the required moisture-proof property even when the horizontal cross section is non-circular. The purpose is to provide. Furthermore, the container for a photographic film cartridge of the present invention enhances the space efficiency in the container main body, and takes into account the ease of opening the lid, the wrapping property in a small box, the suitability for display at stores, and the transportation cost.

[0007]

In order to achieve the above object, a photographic film cartridge of the present invention comprises a container body and
The lid is an injection-molded product, and the horizontal cross section of at least the mounting portion of the container body with the lid has a shape in which four or more arcs are connected to each other, and is formed on the inner peripheral surface of the lid.
The groove or protrusion formed on the outer peripheral surface of the container body.
The lid is attached to the container body with
You . Note that two consecutive arcs have different radii from each other. When the radius of the arc having the longer diameter is R _L and the radius of the arc having the shorter diameter is R _S , the radius ratio R _L / R _S is 1
It is better to be 0 or less. The radius of each of the arcs is preferably 3 mm or more. Further, it is preferable that the thickness t of the outermost peripheral portion of the lid is formed so as to be in a range of 0.5 mm ≦ t ≦ 2 mm.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a photographic film cartridge container 2 of the present invention comprises a container body 3 and a lid 4.
Both the container body 3 and the lid 4 are integrally molded products of resin. The container main body 3 is a cylindrical body with a bottom. After storing the photo film cartridge 110 therein, the lid 4 is attached to the opening end side.

FIGS. 2 and 3 schematically show the XX horizontal cross-sectional shape of the container body 3. FIG. 3 also shows a photographic film cartridge 110 housed in the container body 3. is there. As shown in FIG. 2, the horizontal cross-sectional shape of the container body 3 has an arc having a radius R1 (= 12 mm) and a radius R2.
(= 20.5 mm), each of which is continuous with two arcs. The inner circumference has a major axis L1 of 32 mm and a minor axis L2 of 26 mm. The thickness of the side wall of the container body 3 is about 1 mm over the entire circumference. As shown in FIG. 3, there is no useless space in the non-circular container body 3, and the photographic film cartridge 110 is stably stored without rotating.

Each of the arcs forming the non-circular shape of the container body 3 has two successive arcs having different radii. The radius of the longer arc is R _L , and the radius of the shorter arc is the radius of the shorter arc. Assuming that the radius is R _S , these radius ratios R _L / R _S
Is preferably 10 or less, more preferably 8 or less, and particularly preferably 5 or less. When the radius ratio R _L / R _S is greater than 10, the arc of the major axis becomes substantially linear, and this straight portion forms the container body 3.
The tightness between the cover and the lid 4 is impaired, and the moisture proof property cannot be maintained. In this embodiment, since the radius R1 of the arc is 12 mm and the radius R2 of the arc is 20.5 mm, the radius ratio R _L / R _S is R 2 / R 1 = 1.71.

In order to obtain the above-mentioned shape, first, two semicircles having a radius R1 are drawn centering on points A and A 'which are separated from the center O on the major axis S1 by 4.0 mm to the left and right, respectively. next,
On the short axis S2 passing through the center O and perpendicular to the long axis S1, it is shifted upward and downward from the center O by 13 corresponding to the short diameter L2 (= 26 mm).
The points D and D 'separated by mm are taken. Then, on the short axis S2, two semicircles having a radius R2 are drawn around points B and B 'separated from the points D and D' by 20.5 mm toward the center O, respectively, and the radius R1 drawn earlier is drawn. May be continuous with each of the two semicircles.

Note that the above horizontal cross-sectional shape has the radii R1, R
Although two kinds of two arcs are made of four arcs facing each other, the radius ratio of the continuous arcs may be set to 10 or less. For example, the photograph shown in FIG. Like the film cartridge 10, it is also possible to use two types of arcs 11a and 11b having different radii, each of which has a total of eight arcs.
Further, it is not always necessary to arrange arcs having the same radius so as to face each other, and it is not necessary that the total number of arcs is even. However, if the total number of arcs exceeds 8, the shape of a mold for molding the arcs becomes complicated and impractical.

As shown in FIGS. 1 and 4, the container body 3
A groove 5 having a depth of 0.2 mm is formed on the open end side of the cover 4 so that a tight fit is obtained when the cover 4 is mounted. (Inner circumference), the major axis of the container body 3 is 32.4 mm and the minor axis is 26.4 mm.

A projection 6 that fits into the groove 5 is formed integrally with the entire periphery of the side wall of the lid 4. The major axis of the lid 4 formed at the apex of the projection 6 is 32.8 mm, and the minor axis is 26.8 m
m, the major axis at the fitting portion of the container body 3 is 32.4 mm,
It is slightly larger than the minor diameter of 26.4 mm.
Therefore, the major axis formed at the apex of the projection 6 of the lid 4 is L
3. Assuming that the long diameter formed on the inner periphery of the groove 5 of the container body 3 is L4, w overlaps between them as shown in FIG. When the lid 4 is attached to the container body 3 as shown in FIG. 1, the projection 6 of the lid 4 comes to be pressed into the groove 5 of the container body 3 and the elasticity of the container body 3 and the lid 4 causes the container The main body 3 and the lid 4 are kept tightly fitted.

The dimension of w may be 0 or more over the entire circumference, but is preferably in the range of 0.02 mm to 0.4 mm.
More preferably, it is 0.05 mm to 0.3 mm. w
If the dimension is less than 0.02 mm, there is a possibility that the value may become a negative value due to variations during molding, and
If it is not less than m, the degree of forcible removal becomes strong when the lid 4 is removed from the mold after molding, making it difficult to mold, and the lid 4 is difficult to remove from the container body 3.

In order to easily put a finger on the lid 4 when removing the lid 4 from the container body 3, the upper surface of the lid 4 is 0.5 m in the side wall direction.
A protruding portion 7 protruding about m to 2.5 mm is formed. Although the protrusion 7 may be provided over the entire circumference of the lid 4, as shown in FIG. 1, when the protrusion 7 is provided so as to fit within the region connecting the vertices of the adjacent arcs, the external volume is reduced. And a small box for packaging this can be made smaller. FIG. 5 shows a vertical section of the fitting portion where the projection 7 is not provided, and FIG. 6 shows a vertical section of the fitting portion where the projection 7 is provided.

As shown in FIG. 4, the cover 4 has a recess 8 formed therein. The recess 8 is provided to make the lid 4 easily bend easily when the lid 4 is attached to the container main body 3 or when the lid 4 is removed, so that the lid 4 can be easily opened and closed. When the photographic film cartridge 110 is stored in the photographic film cartridge container 2, the bottom of the lid 4 and the photographic film cartridge 110 are removed.
Is preferably as small as possible from the viewpoint of volumetric efficiency (see FIG. 1B).
In the following, the lid 4 depends on the variation during molding and assembly.
At the time of design.
mm or more. Further, in order to insert the photo film cartridge 110 into the container 2, a certain gap is required between the photo film cartridge 110 and the inner wall of the container 2. However, if the gap is too large, not only does the photo film cartridge 110 rattle in the container 2 during transportation or the like, and abnormal noise is generated, but also the inner wall of the container 2 is scratched, or an impact causes the photo film cartridge 110 or There is a risk that troubles such as breakage of the container 2 may occur. Therefore, it is preferable that the gap between the container 2 and the photo film cartridge 110 is as small as possible.
It is preferable that the gap be 0.1 mm or more and 2.0 mm or less at the projecting portion of the photographic film cartridge 110 where the size becomes the smallest. Further, in order to improve the insertability of the above-mentioned photographic film patrone into the container and to prevent rattling in the container, a method of increasing the diameter of the opening of the container body in comparison with the diameter of the bottom portion is used. Also, a method of forming a plurality of thin ribs on the inner wall of the container to fill the gap, or a method of filling the gap with a cushioning material such as a sponge is preferable.

As described above, the lid 4 is injection-molded with resin. As shown in FIG. 7, the mold 21 of the lid 4 includes an upper mold 21a and a lower mold 21b, and a resin material is injected from a gate 22 provided at the center. At this time, as shown by the dashed line in FIG. 8, since the flow length of the resin material is different between the shortest part 23 having the shortest distance from the gate 22 and the longest part 24, the resin injected from the gate 22 is different. The material reaches the shortest portion 23 earlier than the longest portion 24, and the resin material that has reached the shortest portion 23 is diverted to the longest portion 24 side along the periphery of the lid 4. Further, air accumulated in the mold 21 is also pushed by the resin material and collected in the longest portion 24, and the upper mold 21a and the lower mold 21b are collected.
Is released to the outside through a slight gap formed in the parting line 21c. However, if the thickness t at the outermost peripheral portion 4a of the lid 4 is too thick, the air concentrated on the longest portion 24 tends to stay not only on the parting line 21c side of the outermost peripheral portion 4a but also on the upper portion. Then, when air stays in the mold 21, the resin in a portion in contact with the air is colored by heat generated during compression. Therefore, the thickness t of the lid 4 at the outermost peripheral portion 4a is preferably 2 mm or less, more preferably 1.7 mm or less, and particularly preferably 1.5 mm or less. Further, the thickness t is set to 0.
When the thickness is set to 5 mm or less, the portion of the lid 4 that is fitted to the container body 3 is too small, making it difficult to remove the lid 4 from the container body 3. Therefore, the thickness t is set to 0.5 mm or more. Preferably, more preferably 0.8 m
m or more.

The structure of the fitting portion between the container body 3 and the lid 4 is not limited to that of the above-described embodiment, but may be any of FIGS.
1 may be used. In the example of FIG. 9, a bulging portion 32 is formed at the open end of the container body 31 a so as to extend inward.
The bulging portion 32 is moved over the projection 34a of the lid 33a to obtain a fitted state. In the embodiment shown in FIG. 9, the outermost peripheral portion 35a of the lid 33a is located at the uppermost portion. Therefore, in order to reliably fill the resin material during molding, the thickness t of the outermost peripheral portion 35a is set to 0.5 mm or more. It is preferable to keep it within the range of 2 mm.

In the example of FIG. 10, the lid 33b is
1b is attached so as to surround the opening edge of the cover 1b.
The protrusion 34b of the container main body 31b is fitted into the groove 36 formed in 3b. In the example of FIG. 11, similarly to FIG. 10, an opening edge of the container main body 31c is wrapped by the lid 33c, and a bulging portion 37 protruding outward is formed on the inner periphery of the lid 33c at the opening edge of the container main body 31c. The tight fitting state is obtained by getting over the protrusion 34c. In addition, as shown in FIGS. 10 and 11, the cover 3 is provided outside the container main bodies 31b and 31c.
When the protrusions 3b and 33c are fitted, the horizontal cross-sectional shape formed by the protrusion 34b and the vertex of the bulging portion 37 is made larger than the horizontal cross-sectional shape formed by the inner periphery of the groove 36 and the vertex of the protrusion 34c. . Further, the outermost peripheral portions 35b of the lids 33b and 33c,
Since 35c faces downward from the upper surface, it is not necessary to define the thickness t of the outermost peripheral portions 35b and 35c in these embodiments.

[0021] Container 2 for photographic film patrone of the present invention
Polystyrene, polyethylene (high density (HDPE), medium density (MDP)
E), low density (LDPE) or mixtures thereof), olefin polymers such as polypropylene (block copolymers, random copolymers, homopolymers or mixtures thereof), polyester resins such as polybutylene terephthalate, etc. A thermoplastic material having the following thermoplastic properties is used.

In order to prevent deformation due to external stress,
The body 3 is made of a material having high rigidity, and has moisture-proof properties and easy opening.
For the lid 4, use a material having lower rigidity than the container body 3.
Is preferred. The flexural modulus of the resin used for the container body 3 is
3000 kg / cm^TwoIs preferred, more preferably
6000kg / cm^TwoAbove, more preferably 8000
kg / cm^TwoThat is all. Flexural elasticity of resin used for lid 4
The rate is 800 kg / cm ^TwoAbove, more preferably 1000
kg / cm^TwoAbove, more preferably 1200 kg / c
m^TwoThat is all. Preferable resin material for container body 3 and lid 4
In the case of the combination, the container body 3 is made of polypropylene or
High density polyethylene, lid 4 is low density polyethylene
You.

The preferable range of MI (melt index) or MFR (melt flow ratio) indicating the fluidity of the resin is 7 or more, preferably 10 or more, and more preferably 15 or more in the container body 3. Lid 4
Is 5 or more, preferably 8 or more, and more preferably 12 or more. If a resin having a value of 7 or less for the container body 3 and a resin of 5 or less for the lid 4 is used, the flow of the resin is deteriorated at the time of molding, and a short shot is likely to occur.

Further, it is preferable to add various additives to the resin used. An antioxidant is used to prevent oxidation of the resin due to high temperature during molding, and a lubricant is used to improve moldability and insertability of the photographic film cartridge. It improves crystallization speed, shortens molding cycle, and improves rigidity. A nucleating agent is used to prevent deformation and improve physical strength, and a light-shielding substance and an X-ray blocking substance are used to protect the stored photographic film cartridge from external light and X-rays.

Antioxidants include a free-radical chain terminator that reacts with and inactivates free radicals (mainly ROO.), Which are chain propagators of the oxidation reaction, and is a major source of free radicals. There are peroxide decomposers that decompose and stabilize the hydroperoxide ROOH. The former includes a phenolic antioxidant and an aromatic amine antioxidant. The latter includes a sulfur-based antioxidant and a phosphorus-based antioxidant. For these reasons, it is preferable to use a mixture of a phenolic antioxidant and a phosphorus antioxidant.

Since various antioxidants are also reducing agents that have an adverse effect on the photographic light-sensitive material, unless the amounts of addition are carefully studied, the quality of the photographic light-sensitive material deteriorates in quality, causing a problem. In order to prevent the oxidative decomposition of the resin used in the present invention, it is particularly preferable to use a mixture of a phenolic antioxidant and a phosphorus antioxidant. The addition amount of the above antioxidant is 0.00
It is preferably from 1 to 2.0% by weight, particularly preferably from 0.01 to 0.5% by weight, most preferably from 0.03 to 0.3% by weight. If the amount is less than 0.001% by weight, the effect of the addition is negligible, and only the kneading cost is increased. In addition, the addition amount is 2.
If the amount exceeds 0% by weight, photographic films utilizing the oxidizing and reducing actions may have adverse effects such as fogging and abnormal sensitivity.

Lubricants added to improve moldability and insertability of photographic film patrone include:
Saturated fatty acid amide lubricants such as behenic acid amide, stearic acid amide, barmitic acid amide, lauric acid amide; unsaturated fatty acid amide-based lubricants such as erucamide, oleic acid amide; methylene bisbehenic acid amide, methylene bis stearin Bis fatty acid amide based lubricants such as acid amide, methylene biooleic amide, ethylene bisstearic acid amide, hexamethylene bis stearic amide, hexamethylene bis oleic acid amide, silicone based lubricants of dimethylpolysiloxane and its modified products, nonionic Surfactant lubricant, liquid paraffin, natural paraffin, micro wax, synthetic paraffin, polyethylene wax, polypropylene wax, chlorinated hydrocarbon,
Hydrocarbon lubricants such as fluorocarbons, higher fatty acids (C
12 or more), fatty acid-based lubricants such as fatty acids, lower alcohol esters of fatty acids, ester-based lubricants such as polyglycol esters of fatty acids, alcohol-based lubricants such as polyhydric alcohols, polyglycols and polyglycerol, lauric acid, stearic acid, ricinol Acids, higher fatty acids such as naphthenic acid and oleic acid and Li, Mg, Ca, Sr, Ba,
There is a metal soap such as a compound with a metal such as Zn, Cd, Al, Sn, and Pb. These lubricants may be used alone or, if necessary, in combination of two or more.

The amount of the above lubricant added is 0.01 to
5.0% by weight is preferred. If the addition amount is less than 0.01% by weight, there is almost no effect of the addition, and only the kneading cost increases,
If it exceeds 5.0% by weight, bleed-out occurs,
Not only does the slip of the screw occur, the discharge amount becomes unstable and molding failures occur frequently, but also the kneading property with the resin deteriorates. In the case of a fatty acid amide-based lubricant which is inexpensive and does not adversely affect the photographic film such as fogging or abnormal sensitivity, and has a large lubrication improving effect and a large injection molding cycle shortening effect,
The amount is preferably from 1 to 3.0% by weight, and particularly preferably from 0.02 to 1.0% by weight, from the viewpoints of greatly reducing molding failure and preventing bleed-out. Although the improvement of the lubricating effect is small, hydrocarbon-based lubricants and metal soaps that improve the dispersibility of various additives and improve the fluidity of the resin are used up to 20% by weight or less so as not to cause any problems. It is possible.

The nucleating agent is used for improving crystallization speed, shortening the molding cycle, improving rigidity, improving transparency and preventing deformation, improving physical strength, and the like. There are nucleating agents and inorganic nucleating agents. Representative examples of these are shown below.

Organic nucleating agents include carboxylic acids, dicarboxylic acids, salts and anhydrides thereof, salts and esters of aromatic sulfonic acids, aromatic phosphinic acids, aromatic phosphonic acids, aromatic carboxylic acids, aluminum salts thereof, Metal salts of aromatic phosphates, alkyl alcohols having 8 to 30 carbon atoms, condensates of polyhydric alcohols and aldehydes, and alkylamines, such as aluminum pt-butylbenzoate, 1,3,2,4 dibenzylidene sorbitol , Disubstituted benzylidene sorbitol compounds, metal salts of stearyl lactic acid such as calcium and magnesium, N- (2-hydroxyethyl) -stearylamine, lithium salts of 1.2 hydroxystearic acid, sodium salts, potassium salts, calcium salts and magnesium Metal salts such as salt, stearyl alcohol, lauri Including alkyl alcohol such as alcohol, sodium benzoate, benzoic acid, sebacic acid and the like.

The inorganic nucleating agent includes alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide;
Alkali metal oxides such as sodium oxide, alkali metal carbonates such as lithium carbonate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate, and alkaline earth metal waters such as calcium hydroxide, magnesium hydroxide and barium hydroxide Oxides, alkaline earth metal oxides such as calcium carbonate and calcium oxide.

The nucleating agent is not limited to these, and other known nucleating agents can be used. Further, it goes without saying that the nucleating agent is not limited to a single nucleating agent, and two or more nucleating agents can be used in combination. The addition amount of the nucleating agent is 0.01 to 2.0% by weight, preferably 0.05 to 1.1%.
0% by weight is preferred. If the added amount is less than 0.01% by weight, there is almost no effect, and if it exceeds 2.0% by weight, there is no effect of increasing the amount and only the cost is increased.

Light-shielding substances used to protect the stored photographic film patrone from external light include carbon black, graphite, aluminum powder, aluminum flake, titanium oxide, calcium sulfate, barium sulfate, talc, clay, mica, There are stainless steel powder, starch, tin powder, pearl pigment, zinc oxide, potassium titanate, glass beads and the like. These light-shielding substances may be used alone or in combination of two or more, or in combination with a dye or the like. The light-shielding substance may have been subjected to various surface treatments. The addition amount of the light-shielding substance as described above is preferably 0.01 to 30% by weight. When the addition amount is less than 0.01% by weight, the effect of addition is almost negligible, and only the kneading cost increases.

In order to impart the X-ray opacity function, a barium compound, zinc or a zinc compound, tin or a tin compound, may be added to the molding resin material of the photographic film cartridge container of the present invention.
At least one of lead or a lead compound,
% By weight. However, the appearance and the drop impact strength are reduced unless the thickness is increased.

The required moisture-proofing ability of the photographic film patrone container 2 is slightly different depending on the type of photographic film stored therein, but is 20 mg / 24 hours.
Or less, preferably 15 mg / 24 hour or less, particularly preferably 10 mg / 24 hour or less, and most preferably 5 mg / 24 hour. In order to measure the moisture-proofing ability, about 5 g of a hygroscopic agent such as calcium chloride is put in the container body 3 and the lid 4 is attached. Can be evaluated by weight measurement.

In order to confirm the moisture-proof effect of the photographic film patrone container using the present invention, as a comparative example, one set of linear portions indicated by broken lines in FIG. 2 and a set of semicircles having a radius of 12 mm were used. Ten comparative product samples each made of a container main body having a horizontal cross-sectional shape based on an oblong shape and a lid having a shape corresponding to the shape were prepared, and a moisture-proof test was performed together with ten products of the present invention. The overlap thickness (corresponding to the value of w in FIG. 4) at the fitting portion between the container body and the lid of the comparative sample is 0.2 mm as in the case of the present invention.

The moisture proof test described above was conducted on 10 samples each of the product of the present invention and the comparative sample. As a result, the moisture permeability of the product of the present invention was 1 to 2 mg / 24 hours, while the moisture permeability of the comparative product sample was 13 mg / 24 hours. ~ 31mg / 24ho
ur, it was confirmed that the product of the present invention had a remarkably excellent moisture-proof function.

Further, as containers for storing the photographic film patrone 110, in addition to the above-described oval-shaped containers having a horizontal cross-sectional shape, those having a square shape and a perfect circle shape (the broken line shape in FIG. 3) are used as comparative examples. , Volume efficiency, stacking stability after packaging in a small paper box, suitability for automatic packaging (whether or not it is necessary to adjust the rotation direction when dropping the photo film patrone into the container body), moisture proof (variation ), And the results of comparing the transportation costs with the products of the present invention are shown in a table. The evaluation marks ○, ▲, × indicate “excellent”, “needs improvement”, and “has a problem”, respectively. Indicated.

[0039]

[Table 1]

As can be seen from the above Table 1, the product of the present invention is not only excellent in moisture-proof effect but also excellent in volume efficiency, and is also effective in reducing transportation cost. Also,
As shown in FIG. 13, a small box 40 having a large internal volume is required to package a conventional product, whereas a small box 45 having a small internal volume is sufficient in the embodiment of the present invention. The product of the present invention has better stability.

Next, in order to confirm the volume efficiency of the small box for packaging the photographic film patrone container using the present invention, when storing the same photographic film patrone, the sample of the embodiment of the present invention and the sample of the comparative product were used. Were prepared, and the sizes of small boxes for packaging each were compared. The comparative sample used had a horizontal cross section of a perfect circle. Further, in each of the product of the present invention and the comparative product sample, the size of the container is formed such that a gap of 0.5 mm or more is formed around the photographic film patrone, and the small box for packaging the container is formed of the container. It was formed so as to have a margin of about 0.25 mm around the periphery.

FIG. 14 shows the shape of the photographic film cartridge 50 to be stored. The photo film cartridge 50 has an arc 51a having a radius of 4 mm and a radius of 10.5.
mm arc 51b and the straight portion 51c are continuous with each other, the port portion 50a protrudes 3.7 mm, and as a whole, the major axis is 30.29 mm and the minor axis is 21.
mm. Two arcs 51a, 5 that determine the major axis and minor axis of the photographic film cartridge 50
The radius of 1b is preferably within a range of ± 20% of the above values, more preferably within a range of ± 10%, and particularly preferably within a range of ± 5%. If the radius error of the arcs 51a and 51b exceeds the range of ± 20%, it becomes difficult to form the outer shape into a natural continuous shape.

FIG. 15 schematically shows the horizontal cross-sectional shape of the container of the present invention, and also shows a photographic film cartridge 50 housed inside. The outer periphery of the photographic film cartridge container 60 has a radius of 6.55 m.
m and an arc 61b having a radius of 18.75 mm are continuous, and the major axis and the minor axis are each 34.1 m.
m, 25.08 mm, and the thickness of the side wall is about 1 mm over the entire circumference. Therefore, the radius ratio R _L / R _S between the circular arc 61a and the circular arc 61b is 2.86.

Table 2 below summarizes the results of determining the external dimensions and volume of each small box for packaging the above-mentioned photographic film cartridge container 60 and the comparative sample. In addition, the volume ratio of the product of the present invention when the volume of the comparative product sample is “1” is also shown.

[0045]

[Table 2]

As can be seen from Table 2 above, in the product of the present invention, the internal volume can be greatly reduced as compared with the conventional product having a perfect circular shape, and the size of the entire small box can be reduced. Becomes Further, in the product of the present invention, since the length of the small box in the vertical direction is short and the length in the horizontal direction is long, when this is stacked in the horizontal state similarly to the small box 45 shown in FIG. More stability can be obtained as compared to the case of laminating conventional products having the same dimensions both vertically and horizontally.

[0047]

As described above, in the photographic film cartridge container of the present invention, the outer shape of the container body to which the lid is attached is formed so that four or more arcs are continuous with each other in a horizontal cross section. Therefore, the sealing performance when the lid is attached can be enhanced, and the moisture-proof function can be greatly improved. In addition, there is little wasted space in the container body, which is advantageous in terms of volumetric efficiency, and the transportation cost can be reduced. Further, by setting the radius of each of the arcs to 3 mm or more, the connection between the arcs can be smoothly connected, and the moisture-proof effect can be further enhanced. Further, the connection between the arcs can be made smooth by setting the radius ratio of the continuous arcs to 10 or less. Also, the thickness of the outermost periphery of the lid is 0.5
By setting the thickness in the range of 2 mm to 2 mm, it is possible to reliably fill the resin material into the details at the time of injection molding. Thereby, it is possible to prevent the unfilled portion of the resin material from developing color due to heat at the time of compression, and it is possible to obtain a molded article in a good state.

[Brief description of the drawings]

FIG. 1 shows a container for a photographic film cartridge using the present invention, wherein FIG. 1 (A) is a plan view and FIG. 1 (B) is a vertical sectional view.

FIG. 2 is an explanatory diagram of a cross section taken along line XX of the container main body shown in FIG.

FIG. 3 shows X in a state where a photo film patrone is stored.
It is explanatory drawing of -X cross section.

FIG. 4 is a vertical sectional view of a main part of a fitting portion of the photo film cartridge of FIG. 1;

FIG. 5 is a vertical cross-sectional view of a main part of the photo film cartridge container of FIG.

FIG. 6 is a vertical sectional view of a main part of the photo film cartridge container of FIG.

FIG. 7 is a sectional view of a mold for molding a lid.

FIG. 8 is an explanatory view showing a flow state of a resin material in the mold shown in FIG. 7;

FIG. 9 is a main part vertical sectional view showing another example of a fitting portion structure between the container body and the lid.

FIG. 10 is a main part vertical sectional view showing another example of the fitting portion structure between the container body and the lid.

FIG. 11 is a main part vertical sectional view showing still another example of the structure of the fitting portion between the container body and the lid.

FIG. 12 is an explanatory view showing another example of the horizontal cross-sectional shape of the container for a photo film cartridge of the present invention.

FIG. 13 is an explanatory diagram showing a state in which the photo film cartridge containers of the present invention are packed in small boxes and stacked.

FIG. 14 is an explanatory view showing the shape of a photographic film cartridge.

FIG. 15 is a horizontal sectional view of a container of the present invention for storing the photographic film cartridge shown in FIG.

FIG. 16 is an explanatory view showing a horizontal cross-sectional shape of a conventional container for a photographic film cartridge.

[Explanation of symbols]

2, 10, 60, 120 Photo film patrone container 3 Container body 4 Lid 4a Outermost peripheral portion 5 Groove 6 Projection 7 Projection 50, 110 Photo film patrone

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03C 3/00

Claims (2)

(57) [Claims] 1. A container for a photo film patrone made of resin, comprising a container body having a bottom and a lid attached to an opening end side of the container body, and a photo film patrone contained therein. And the lid is an injection-molded product, and the horizontal cross section of at least the mounting portion of the container body with the lid is 4
Two mutually continuously in more than three of each other is continuously arc-shaped
Have different radii, and the arc with the longer diameter
Radius and R _L, diameter shorter arc radius of the R _S of
When the radius ratio R _L / R _S is 10 or less,
Each of the radii is 3 mm or more , and a groove or a protrusion formed on an inner peripheral surface of the lid is fitted into a protrusion or a groove formed on an outer peripheral surface of the container body, and the lid is attached to the container body. A container for photographic film patrone, which is mounted on a photographic film cartridge. 2. The lid according to claim 1, wherein the outermost peripheral portion has a thickness t of 0.5 m.
2. The container for a photographic film cartridge according to claim 1, wherein m ≦ t ≦ 2 mm .