JPH043152A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To allow the secure adhesion of felts without impairing the light shielding performance of the felts by adhering the felts by adhesives or a part of a cassette body so as to enclose one end side of light shielding members on the inner side of a cassette body. CONSTITUTION:The top end of a film 4 is delivered through the spacing between the felts 10 and 11 from a film delivery port 12 to the outside of the cassette body 3. Grooves 17 orthogonal with the film feed direction are respectively formed in upper and lower inside walls 9a, 9b. Notches 18 parallel with the grooves 17 are respectively formed on the film delivery port side of the upper and lower inside walls 9a, 9b. The side faces on the film delivery port side of the grooves 17 are provided with the inclination parallel with the transverse direction of the film from the inside of the cassette toward the outside. The acrylic hot melt adhesives 19 formed to a rod shape are adhered to the grooves 17. The felts are adhered by the adhesives 19 or a part of the cassette body 3 so as to enclose one end of the light shielding members on the inner side of the cassette body in such a manner, by which the light shielding members are securely adhered without pressing the entire surface thereof to the adhesives and the cassette body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film cartridge, and more particularly to a photographic film cartridge in which a method of adhering a light-shielding member attached to a film path is devised.

[Conventional technology]

A photographic film cartridge stores a film in a light-tight manner inside the cartridge body, and allows the film to be sent out from a film feeding port formed in the cartridge body. A pair of telescopes are attached to the film feeding port with adhesive, double-sided tape, etc. so as to sandwich both sides of the film. This telempu is made up of a ground cloth and a pile that is fluffed on the surface, like a bell head dyed black, and the fluff of this pile blocks the film feed opening and It blocks external light from entering the cartridge body through the outlet.

(Problem to be solved by the invention) By the way, in order to firmly adhere and adhere the above-mentioned telemp,
It is necessary to adhere the base fabric to adhesive or double-sided tape,
There was a problem in that when the surface of the terempu was pressed, the pile was crushed and the light-shielding performance was impaired, making it impossible to strengthen the adhesion. Furthermore, although adhesive using double-sided tape is easy, there is also the problem that it easily peels off under high temperature and high humidity conditions.

Further, in order to simplify the loading operation into the camera, a photographic film cartridge in which the leading edge of the film is contained within the cartridge body is disclosed in US Pat. No. 4,834,306. In this photographic film cartridge, a circumferential lip formed on the flange of the spool prevents the film from curling, and by rotating the spool, the leading edge of the film can be fed out of the cartridge.

In such photographic film cartridges, the leading edge of the film protrudes into the center of the telescope attached to the upper and lower inner walls of the film passage, thereby achieving the minimum feeding force. The tip of the film may get caught and not come out.Furthermore, if the tape is not firmly adhered to the upper and lower inner walls of the film path, there will be a problem that the film will be peeled off at the end of the film being fed out.

[Object of the Invention] The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a photographic film cartridge to which a telescope is firmly adhered without impairing the light-shielding performance of the telescope.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a groove or slope on one end of the light shielding member inside the cartridge main body in the direction in which the gap between the upper and lower inner walls increases, and furthermore, the light shielding member is formed with adhesive or a part of the cartridge main body. It is wrapped and fixed. In another invention, the inner wall surface of the film path to which the light shielding member is bonded is roughened to increase the bonding area with the light shielding member.

[Function] According to the above structure, since the adhesive or a part of the cartridge body is bonded so as to wrap around one end of the light shielding member on the inside of the cartridge body, the entire surface of the light shielding member is not pressed against the adhesive or the cartridge body. , the adhesion can be strengthened.

Furthermore, since the inner wall of the film path is roughened to enlarge the bonding area before the light shielding member is bonded, the bonding can be strengthened.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIGS. 1 and 2 show an embodiment of the film cartridge of the present invention, and the film cartridge 2 includes a cartridge main body 3 molded from light-shielding polystyrene resin,
It consists of a film 4 wound around a spool 5 housed in a cartridge main body 3. Flanges 5a are formed at both ends of the spool 5.
serves to align both ends of the film 4 and also to block external light from the sliding contact portion between the spool 5 and the cartridge main body 3. A circumferential lip 5b is integrally formed on the flange 5a, and this lip 5b abuts against the outer periphery of the film to prevent curling. As a result, when the spool 5 is rotated clockwise (hereinafter referred to as the feeding direction), the leading end of the film 4 is immediately rotated in the feeding direction.

A pair of guide ribs 6b are provided on the lower case 14 of the cartridge main body 3. A separating claw 7 is formed at one end of the guide rib 6b, and this separating claw 7 contacts the lip 5b so as to warp the flange 5a outward, thereby canceling the prevention of curling and fraying of the film 4 performed by the lip 5b. At the same time, it comes into contact with the tip of the film 4 and peels it off from the outer peripheral surface of the film 4. The guide rib 6b and the guide rib 6a formed on the upper case 13, which will be described later, send the leading end of the film 5 to a film passage 9 formed inside the boat section 8. On the upper and lower inner walls 9a and 9b of this film passage 9, a pair of telescopes 10 and 11 made of velvet fabric woven from rayon are adhered, respectively. The leading edge of the film 4 passes between telescopes 10 and 11 and is sent from the film outlet 12 to the cartridge main body 3.
be sent outside.

The cartridge main body 3 consists of a semi-cylindrical upper case 13 and a lower case 14, and plate-shaped tongue pieces 15 and 16 are formed at one end side of the upper case 13 and the lower case 14 along the longitudinal direction. ing. Telemp10. After If is bonded, when the upper case 13 and the lower case 14 are combined, these tongue pieces 15 and 16 form the port part 8.

Grooves 17 perpendicular to the film feeding direction are formed in the upper and lower inner walls 9a and 9b, respectively. In addition, the upper and lower inner walls 9
Notches 18 parallel to the groove I7 are formed on the film outlet sides of a and 9b, respectively. Further, the side surface of the groove 17 on the film outlet side is sloped parallel to the film width direction from the inside of the cartridge to the outside.
This prevents the leading end of the film 4 being sent out from getting caught in the groove 17. Note that although the groove 17 is used in this embodiment, it may be a slanted notch. Further, an acrylic true melt adhesive 19 formed in a rod shape is adhered to this groove 17 .

The telemp 10.11 consists of a base cloth 20 and a bail 21, and a true melt adhesive 22 is applied to the exit side portion of the adhesive surface of the base cloth 20.

Insert the back part of this Telempu IO311 into the groove 17 and the outlet part into the notch 18, and apply a heat sealer for 5 seconds.
Heat to 00°C. The hot melt adhesive 19 is in the groove 17
The hot-melt adhesive 22 melts inside and permeates so as to wrap around the inner part of the base fabric 2o, and the hot melt adhesive 22 melts at the outlet side of the base fabric 20 and adheres to the lower case I4. When these are cooled and hardened, as shown in FIG.
The inner part of 11 is glued into the groove 17 in a wrapped state. Further, the outlet side portion of the telescope 10.11 is glued to the slope of the notch 18.

In this embodiment, the hot melt adhesives 19 and 20 were melted using a heat sealer, but there is also a method of bonding by melting and reactivating them using ultrasonic waves or high frequency waves. In this embodiment, a solid hot melt adhesive is melted, but the melted hot melt adhesive may be poured into the groove 17. In addition, although hot melt adhesive 22 was used, a protruding part was formed in advance as a part of the cartridge body 3, and this was melted to wrap around and fix the back part of the telescope 10 and 11. A similar effect can be obtained.

As long as both ends of the telescopes 10 and 11 are fixed, there is no need to glue the center part, but especially if precision is required in the overlapping condition of the bails 21, it may be fixed as necessary. At this time, it is not possible to apply pressure that would cause the vile 21 to lie down on the entire surface of the central part and fuse it, so as shown in FIG. 4, the true melt adhesive 23 is placed in spots on the inner wall 9b. This will fuse it. It is preferable that the true melt adhesives 23 are arranged so as not to line up in the feeding direction of the film 4. In this way, the portion where the bail 21 is laid out can be made sparse, and external light entering the inside of the cartridge body 3 through the film path 9 can be reliably blocked.

In this example, rayon was used as the material for Telempu 10 and 11, but nylon and acrylic were used.

Synthetic fibers such as polyester, vinylon, vinyl chloride, vinylidene copolymer, polypropylene, polyethylene polycarbonate fiber, cupro acetate, cotton5
You can also use natural or recycled fibers such as silk. In addition, as a light shielding member, terempu 10.11 of a textile having a bail
However, other materials such as a film-like light-shielding material having piles, non-woven fabric, flocked cloth or film, synthetic leather, elastic sponge, etc. may also be used.

The operation of the film cartridge of the present invention constructed as described above will be explained. In this film cartridge 2, the film passage 9 is shielded from light by a pair of telescopes 10 and 11, and the cartridge main body 3 accommodates the film 4 up to its tip.
The interior is kept light-tight. When the film cartridge 2 is loaded into the camera, the spool 5 is moved by the camera's drive mechanism.
is rotated in the feeding direction. This rotation causes the film 4
The tip of the film 4 is immediately rotated in the feeding direction, and when it comes into contact with the separation claw 7, it is peeled off from the outer peripheral surface of the film 4. The tip of the peeled film 4 is guided by guide ribs 6a, 6b and sent to the film path 9.

Since the groove 17 of the film passage 9 is sloped outward from the inside of the cartridge, the leading edge of the film 4 is in the groove 1.
There is no way to get into 7 and be stopped here. Further, the leading end of the film 4 is guided by a slope formed on the back side of the telescope 10, 11, and is sent between the piles 21. At this time, the tip of the film 4 is
When it comes into contact with the back side of 10, 11, a force is applied to the telescope 10 and 11 in the direction of peeling it off, but since the back side is wrapped and bonded with hot melt adhesive 19, these There are no words that can be taken away.

Thereafter, the leading edge of the film 4 passes between telescopes 10 and 11 and is fed out of the cartridge main body 2. At this time as well, since the pile 21 comes into sliding contact with both sides of the film 4,
The interior of the cartridge body is kept light-tight.

FIG. 5 shows another embodiment of the invention, in which minute triangular grooves 33 are formed on the bottom surface 17a and slope 17b of the groove 17 and on the bottom surface 18a and slope 18b forming the notch 18, respectively. formed and roughened. This groove 33 is integrally formed in the upper case 13 and lower case 14 when they are molded. Further, this groove 33 is minute, and the interval between the upper vertices is, for example, 0.1 mm.

In this embodiment, the grooves 33 are used to roughen the surface, but these may be minute protrusions. In this way, the adhesive area with the telescope 11 can be increased. The bottom surface 17a and the slope 17b and the bottom surface 18a and the slope 18b
An acrylic true melt adhesive 34 is applied in advance.

By placing both ends of the telescope 11 on the bottom surface 17a, slope 17b, bottom surface 18a, and slope 18b (hereinafter referred to as application surfaces) configured in this manner and heat-sealing them, the adhesion can be strengthened. . In this example, a mold with fine protrusions is used to form grooves 33 on the coating surface.
However, it is also possible to form irregularities on the coated surface using a mold having irregularities. In addition, when forming irregularities on the coated surface, it may be done by filing or the like after molding. Note that this roughened or protruded portion is the groove 17 or notch 1.
8, but also the entire contact surface of the telescope 11.

Further, in the above embodiment, the hot melt adhesive 34 was provided in advance on the cartridge main body 3, and the hot melt adhesive 34 was melted to adhere the telescope 32. However, when adhering the telescope 32,
A molten hot melt adhesive may also be applied. Also,
A true melt adhesive may be applied to both ends of the telescope 32, and the adhesive may be used for fusing. Furthermore, in addition to hot melt adhesives, adhesives, adhesive tapes in which the adhesive is applied onto a base material, or curable adhesives that are applied at the time of adhesion and are naturally or thermally cured may be used.

Next, the adhesive strength of Telempu will be compared between each of the embodiments described above and the conventional example. In addition, Sample 1 is one in which one end of the Terenpu is wrapped and fixed, and Sample 2 is one in which micro grooves are formed on the surface where the adhesive is applied and the Terene is adhered. , a conventional example is one in which terempu is glued. In the comparative test, an Instron tensile tester was used to peel off a portion of the adhesive tape, and the film was peeled off in such a way that the peeling direction was perpendicular to the film feeding direction. In addition, the adhesive width of Terempu is 10
mm, and the peeling speed is 10 aa/sec.

After adhesion, the adhesive strength was measured after being left at a temperature of 23 degrees and a humidity of 65% for a day and night. Sample 1 was 1240 g/10 m.
, sample 2 is 950g/10kg, conventional example 320g/
It was 10+m. In addition, the measurement result of the adhesive strength after being left for two days and nights at a temperature of 60 degrees Celsius and a humidity of 80% was 12 for sample 1.
The 50g/10mm sample 2 had a weight of 850g/10cm, and the conventional example had a weight of 150g/10aI.

From the above measurement results, each example of the present invention clearly shows stronger adhesive force than the conventional example, and when welded so as to wrap around the end face of the telescope as in sample 1, it shows very strong adhesive force. It can be made to stand. Furthermore, in this case, the adhesive strength does not change even under high temperature and high humidity conditions.

In each of the embodiments, the leading edge of the film is stored in the cartridge main body 3, and the spool 9 is rotated to perform initial film feeding. It can also be applied to a conventional film cartridge in which the cartridge is exposed outside the cartridge main body 3.

〔Effect of the invention〕

In the present invention, since one end of the light shielding member on the inside of the cartridge body is adhered with the adhesive or a part of the cartridge body, the adhesive force is increased without pressing the entire surface of the light shielding member to the adhesive or the cartridge body. It can be made stronger.

In another invention, the inner wall of the film passage is roughened,
Since the light shielding member is bonded after expanding the bonding area with the light shielding member, the adhesive force can be strengthened. Therefore, it is possible to provide a photographic film cartridge in which the telescope is firmly adhered without impairing the light-shielding performance of the telescope.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the photographic film cartridge of the present invention. FIG. 2 is a sectional view showing the inside of the photographic film cartridge shown in FIG. 1. FIG. 3 is an enlarged sectional view showing the main parts of the photographic film cartridge. FIG. 4 is an explanatory diagram showing hot melt adhesive arranged in the film path. FIG. 5 is a sectional view showing essential parts of another invention. Fig. 2 3...Patrone body 4...Film 9...Film passages 9a, 9b...Inner wall 17...Grooves 17a, 18a...Bottom surface 17b, 18b...Slope I8... Notch 10, II...Telemp 19.22, 23.34...Hontomelt adhesive 33.
...Minute grooves.

Claims (3)

[Claims] (1) In a photographic film cartridge that blocks light entering the interior from the film passage with band-shaped light-shielding members affixed to the upper and lower inner walls of the film passage through which the film stored in the cartridge is sent out, facing each other. . A photographic film cartridge, characterized in that a groove or an inclination is provided on the inside of the cartridge in the film passage to which the light shielding member is attached, in a direction in which a gap between the upper and lower inner walls increases. (2) In a photographic film cartridge that blocks light entering the interior from the film passage with band-shaped light shielding members attached facing each other to the upper and lower inner walls of the film passage through which the film stored in the cartridge is sent out. A photographic film cartridge, characterized in that one end of the light-shielding member on the inside of the cartridge body is wrapped and fixed with an adhesive or a part of the cartridge body. (3) In a photographic film cartridge that blocks light entering the interior from the film passage with band-shaped light-shielding members affixed to the upper and lower inner walls of the film passage through which the film stored in the cartridge is sent out, facing each other. . A photographic film cartridge, characterized in that the inner wall surface of the film passage to which the light shielding member is bonded is roughened to increase the bonding area with the light shielding member.