JPH028277Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographic film cartridge assembly in which a disk film is rotatably housed in a thin casing.

For example, as shown in Japanese Patent Publication No. 57-46057, an opaque front plate, an opaque rear plate facing the front plate with a gap, and an opaque side wall extending between the peripheries of these two plates. A photographic film cartridge assembly is known in which a disk film is rotatably housed in a thin casing made of a thin casing, and the disk film is exposed to light through an exposure window provided in the front plate.

In this type of photographic film cartridge assembly (hereinafter simply referred to as a cartridge), the side walls are generally formed into a double wall structure in order to sufficiently enhance the light shielding effect. That is, the peripheral edge of the front plate is provided with a front plate side wall that protrudes toward the rear plate, and the peripheral edge of the rear plate is provided with a rear plate side wall that protrudes toward the front plate at a position shifted from the front plate side wall. (In order to further enhance the light shielding effect,
Alternatively, a side wall may be provided in addition to the double wall to join the front plate and the rear plate). Due to the manufacturing and assembly process of the cartridge, the front side wall and the rear side wall are usually not formed in close contact with each other over the entire circumference, but are spaced apart partially or over the entire circumference. The position is such that a gap is created between the two.

The above-mentioned gap may communicate to the outside of the cartridge through, for example, a notched hole for combining the front plate and the rear plate, but if the tip of the side wall inside the gap meets the inner surface of the mating plate. If you are very close,
The outside light that has entered the gap is directly directed to the center side of the cartridge (i.e., to the disk film storage space side).
It never goes away. However, the light that has entered the above-mentioned gap runs inside the gap along the side wall, and passes into the disk film storage space from a place where the side wall and the plate are not in perfect contact with each other, causing fogging on the disk film. There is.

The object of the present invention is to provide a cartridge in which the disk film is not covered by external light passing through the gap between the side walls as described above.

The cartridge of the present invention is a cartridge in which a gap is formed between the front side wall and the rear side wall as described above, and each side wall is provided with light-shielding ribs protruding toward the other side wall in close proximity to each other. It is characterized by:

When the above-described light-shielding ribs are provided, external light entering the space between the side walls from outside the cartridge is blocked by the light-shielding ribs, and therefore does not reach the disc film storage space of the cartridge.
Therefore, no overlap occurs on the disk film.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an exploded view of a cartridge according to an embodiment of the present invention. The casing 2 of the cartridge 1 is made of an opaque material such as plastic, and has side walls 3a, 3b and a side wall 4, each of which will be described later.
It is formed by integrally molding a front plate 3 and a rear plate 4, each having a and 4b formed on the peripheral edge. FIG. 1 shows the casing 2 in an unfolded state. Both plates 3 and 4 are folded together from a hinge part 5 connecting the two plates 3 and 4, and side walls 3a and 3b and side walls 4a and 4b are folded together. The thin casing 2 is assembled by closing the gap between 3 and 4. The front plate 3 has a hub 6 at the center of its inner surface and an exposure window 7. A central annular portion 8a of a light shielding plate 8 formed of an opaque sheet material is rotatably fitted into the hub 6. This light-shielding plate 8 is covered with a separator 10 having an exposure window 9 aligned with the exposure window 7 of the front plate 3, and the separator 10 is covered by, for example, welding the peripheral edge of the light-shielding plate 8 while allowing the light-shielding plate 8 to rotate. It is fixed to the front plate 3 in the same way. Separator 1
Further, a disk film 11 is disposed on the outer side of 0 (on the rear plate 4 side). The disc film 11
A photosensitive surface (emulsion surface) 14 is provided on the front plate 3 side surface of the circular base sheet 13 supported by the central core 12.
When the front plate 3 and the rear plate 4 are combined with each other, the core 12 is attached to the hub 1 of the front plate 3.
5. It is supported by the hub 16 of the rear plate 4 and is rotatably housed within the cartridge 2.

The light shielding plate 8 has claws 8b and 8c formed on the outer periphery of the annular portion 8a that engage the protrusions 17 and 18 of the front plate 3.
When the cartridge 1 is not loaded into the camera, the fan-shaped light-shielding portion 8d maintains the rotational position covering the exposure window 7 of the front plate 3. When the cartridge 1 is loaded into the camera, a lock release member (not shown) provided on the camera side enters the cartridge 1 through the lock release hole 19 of the front plate 3 and moves the light shielding plate 8 to the separator 10 side. By pressing, the claws 8b, 8c and the protrusion 1
7 and 18 are released. Alternatively, the light-shielding plate 8 is rotated by a drive member (not shown) on the camera side that engages with a light-shielding plate driving claw 8e peeking out of the cartridge 1 from the arcuate groove 20 of the front plate 3, and the exposure window is rotated by a drive member (not shown) on the camera side. Open 7. When the exposure window 7 of the cartridge 1 is opened in this way, the disk film 1
One photosensitive surface 14 can be exposed to light. When the light shielding portion 8d of the light shielding plate 8 closes the exposure window 7, the pressure bonding plate 21 fixed to the rear plate 4 presses the light shielding portion 8d against the frame of the exposure window 7 to complete light shielding. When the light shielding plate 8 opens the exposure window 7, the disk film 11 is pressed against the frame of the exposure window 7 to set the photosensitive surface 14 at a predetermined exposure position within the camera.

Next, the features of the present invention will be explained. Second
The figure shows the planar shape of the side walls formed on the inner peripheral edges of the front plate 3 and rear plate 4 of the casing 2 (in this figure, the front plate 3 and the rear plate 4 are
Elements other than the upper side wall are omitted). At the peripheral edge of the front plate 3, which is formed one size larger than the rear plate 4, there is a front plate side wall 3a extending over the entire circumference of the front plate 3.
A front plate side wall 3b extends from the inside of the front plate side wall 3a along the front plate side wall 3a and is interrupted in the vicinity of the hinge portion 5. These front plate side walls 3a, 3b are formed to protrude perpendicularly from the front plate 3, so that the front plate 3 is connected to the rear plate 4 as described above.
In the folded state, these front plate side walls 3a, 3b protrude toward the rear plate 4. At the corner farthest from the hinge portion 5, both side walls 3a and 3b are separated from each other by a large distance, and between them, the front plate 3 has a notch fitting through hole 3c,
3d has been opened. The inner front plate side wall 3b has light shielding ribs 3e, 3 that protrude outward so as to surround both ends of the through holes 3c, 3d.
f, 3g, and 3h are provided. Also, in the portion extending along the hinge portion 5, the outer front plate side wall 3
A is provided with a light-shielding rib 3k that protrudes inward. The above light shielding ribs 3e, 3f, 3
g, 3h and the light shielding rib 3k are respectively side walls 3b,
It is formed at the same height as 3a.

On the other hand, the peripheral edge of the rear plate 4 includes a rear plate side wall 4a extending around the entire circumference of the rear plate 4, and a portion extending inside the rear plate side wall 4a from the vicinity of the hinge portion 5 to both side edges of the rear plate 4. , and a rear plate side wall 4b that is interrupted at the tip end portion on the opposite side to the hinge portion 5. These rear plate side walls 4a, 4b are the rear plate 4
It is formed to protrude perpendicularly from the
When the rear plate 4 and the front plate 3 are folded together as described above, the rear plate side walls 4a and 4b protrude toward the front plate 3. At the corner farthest from the hinge portion 5, the side walls 4a, 4b are separated from each other by a large distance, and notches 4c, 4d are integrally formed in the outer rear plate side wall 4a between them. The rear plate side wall 4a has the above-mentioned notches 4c,
Light-shielding ribs 4e, 4f, 4g, and 4h protruding inward are provided near both ends of 4d. Further, in a portion extending along the hinge portion 5, the rear plate side wall 4a is provided with a light-shielding rib 4k that protrudes outward.

When the front plate 3 and the rear plate 4 are folded from the hinge part 5 and put together so as to face each other, the outer front plate side wall 3
The outer rear plate side wall 4a is located inside of a, the inner front plate side wall 3b is located further inside thereof, and the inner rear plate side wall 4b is located further inside thereof. That is, the side wall of the casing 2 has a double wall, triple wall, or quadruple wall structure to prevent outside light from entering the inside. In this state, the outer rear plate side wall 4a
The leading end surface of the casing 2 is joined to the inner surface of the front plate 3 by, for example, ultrasonic welding, thereby forming a casing 2 with a high light-shielding effect.

FIG. 3 shows a state in which the front plate 3 and the rear plate 4 are assembled on the opposite side of the hinge portion 5 when the front plate 3 and the rear plate 4 are joined as described above. In addition, in this FIG. 3, the side wall 4 of the rear plate 4 is
Only a and 4b are shown and hatched (the same applies to Fig. 4 below). As shown in FIG. 3, the notches 4c and 4d of the rear plate 4
are fitted into the through holes 3c and 3d of the front plate 3, and serve to maintain the front plate 3 and the rear plate 4 in a predetermined relative position.
The through holes 3c, 3d are located between the rear plate side wall 4a and the front plate side wall 3b, which are far apart from each other, so that the through holes 3c, 3d can be connected to the side wall 4a,
External light may enter the gap between the holes 3b. However, as shown in FIG. 3, when the front plate 3 and the rear plate 4 face each other, the light shielding ribs 3e and 4e, 3f and 4f, 3g and 4g, 3
h and 4h, the external light that enters this gap will travel between the rear plate side wall 4a and the front plate side wall 3b toward the hinge portion 5 (in the upward direction in Fig. 3). ) or toward the other through hole 3c or 3d (leftward or rightward in FIG. 3). Therefore, the front plate side wall 3b and the inner surface of the rear plate 4, or the rear plate side wall 4b and the inner surface of the front plate 3 are connected to the through hole 3c,
Even if the close contact is incomplete at some position away from 3d, external light will travel to that part and enter the casing 2, preventing the disc film 11 from being covered.

Further, as shown in FIG. 4, a light shielding rib 3 provided on the front plate side wall 3a near the hinge portion 5
k and the light-shielding ribs 4k provided on the rear plate side wall 4a are also close to each other, making the gap between the side walls 3a, 4a intricate. Therefore, the front plate side wall 3
Even if the contact between A and the inner surface of the rear plate 4 is incomplete and external light enters the gap as shown by arrow A in FIG. 4, this external light will be blocked by the light shielding ribs 3k and 4k. , cannot advance inward of the casing 2, and does not cause overlap on the disk film 11.

In the cartridge 1 of this embodiment, a high projecting portion 3l extending to both ends of the corner is formed on the front plate side wall 3a at the corner where the light shielding rib 3k is provided. (see figure). Therefore, this projecting portion 3l acts as a light shielding member and effectively prevents external light from entering from the direction of arrow A as described above.

The light shielding ribs 3e, 3f, 3 as explained above
g, 3h, 3k, 4e, 4f, 4g, 4h, 4k
In order to investigate the light-shielding effect of the overhanging portion 3l, the cartridge 1 of the above embodiment and the light-shielding ribs 3e-
Prepare 10 samples each of 4k and non-shading cartridges that do not form an overhang 3l, and compare them.
After being exposed to light at 100,000 lux for 30 minutes, the occurrence of fogging on each disc film was examined. As a result, in all the samples of the above-mentioned cartridges with no light-shielding measures, overlap occurred over a wide range from the frame close to the hinge part to the frame opposite to the frame, whereas in the cartridge 1 of the above-mentioned example, overlap occurred in all the samples. No fogging occurred on the disc film 11 during the test.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a cartridge according to an embodiment of the present invention, FIG. 2 is a plan view showing the front and rear plates of the cartridge, and FIG. 3 is a partially enlarged view of the cartridge. FIG. 4 is a partially cutaway plan view showing an enlarged part of the cartridge, and FIG. 5 is a partial perspective view showing a part of the cartridge enlarged. 1... Cartridge, 2... Casing, 3...
...Front plate, 3a, 3b...Front plate side wall, 3e, 3f,
3g, 3h, 3k, 4e, 4f, 4g, 4h, 4
k... Light shielding rib, 4... Rear plate, 4a, 4b... Rear plate side wall, 11... Disk film.

Claims (1)

[Scope of utility model registration request] A disk film is rotatably housed in a casing consisting of an opaque front plate, an opaque rear plate facing the front plate with a gap, and an opaque side wall extending between the peripheral edges of these plates. In the photographic film cartridge assembly, a front plate side wall protrudes toward the rear plate at the peripheral edge of the front plate, and a front plate side wall is shifted from the front plate side wall at the rear plate peripheral edge to form a double side wall. A photographic film cartridge assembly characterized in that a rear plate side wall that protrudes toward one side of the photographic film cartridge is provided with light-shielding ribs that are close to each other and protrude toward the other side wall.