JPH0473766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film cartridge that prevents erroneous loading of film into a camera with an incompatible film type.

2. Description of the Related Art Self-processing photographic films used in so-called instant cameras, large sheet films, and the like are often stored in a holder and handled as a cartridge. As an example of a camera that uses such a film cartridge (hereinafter simply referred to as a cartridge), the cartridge loading section is formed into a bottomed cylindrical shape (generally square cylindrical shape), and the cartridge is inserted from one end side of the cartridge loading section. It is known to be loaded with

On the other hand, especially in the instant cameras mentioned above, in order to simplify the device, mechanisms such as program shutters are often designed to suit the sensitivity of the film to be used, so Film is often not given the proper exposure. Furthermore, conventionally, cameras have been considered that are pre-equipped with film for specific artificial light, and if such a camera is used with a daylight film cartridge loaded, it may not be possible to take proper pictures. .

Therefore, the film cartridge described above cannot be loaded into an incompatible camera, that is, a camera that uses film of a different type (sensitivity, spectral characteristics, etc. as described above) from the film stored in the cartridge. This is preferable because misuse can be prevented. Therefore, conventionally, in cartridges for instant cameras having a cylindrical cartridge loading section as described above, locking protrusions were provided on the surface of the cartridge at different positions depending on the film sensitivity, and these were attached to the inner circumferential wall of the cartridge loading section of non-conforming cameras. A cartridge is also provided in which the protrusion is engaged with the engagement claw to prevent loading, while the projection is not engaged with the engagement claw of a compatible camera so that the cartridge can be loaded normally.

However, since the above cartridge has locking protrusions protruding from its surface, it is naturally impossible to manufacture it using existing manufacturing and assembly equipment that was used to manufacture cartridges without locking protrusions, such as automatic assembly. It is not possible to manufacture using existing manufacturing and assembly equipment without making major modifications to many of the equipment, such as the handling mechanism of the parts.

The present invention has been made in view of the above circumstances, and provides a cartridge with a function to prevent misloading, which can be manufactured using manufacturing and assembly equipment that previously manufactured cartridges without a function to prevent misloading. The purpose is to

As described above, the incorrect loading prevention cartridge of the present invention is a film cartridge that is inserted and loaded from one end side into a cylindrical film cartridge loading section of a camera, and when the cartridge is inserted, the cartridge faces the inner circumferential wall of the loading section. A recess having a side wall facing the one end surface and substantially perpendicular to the insertion/loading direction is provided on the cartridge surface, and an abutting member guide portion that is aligned with the recess and smoothly continues with the cartridge surface; The abutting member guide portion is such that when a cartridge is inserted into the camera, the abutting member attached to the inner wall of the cartridge loading portion of the non-conforming camera enters the recess and abuts and engages with the side wall during insertion; The arrangement position of the abutting member attached to the inner wall of the cartridge loading section of the compatible camera is selectively set for each type of cartridge so that it does not slide on the guide part and abut against and engage with the side wall. That is.

As described above, if a recess is provided on the surface of the cartridge and the abutting member is brought into contact with the side wall of the recess, the outer shape of the cartridge protrudes outward compared to a cartridge that does not have a function to prevent misloading. Therefore, the cartridge to prevent misloading can be manufactured by using the manufacturing and assembly equipment that had been used to manufacture cartridges that do not have a function to prevent misloading, or by using equipment that has been slightly modified. Manufacturable.

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

FIGS. 1 and 2 show a film cartridge that prevents incorrect loading according to one embodiment of the present invention.
The cartridge 1 of this embodiment is, for example, a case 3 in which a plurality of self-processing photographic films 2 used in the above-mentioned instant camera are stored. As shown in FIG. 1, the film 2 is pressed toward the top plate 6 by a leaf spring 5 supported on the inner surface of the back plate 4 of the case 3, and the exposure opening 7 provided in the top plate 6 is shielded from light. A film drawer opening 9 through which the exposed film 2 is pulled out is also closed by a light-shielding tape 10 (these light-shielding plates 8, light-shielding tape 10
is removed by a mechanism on the camera side after the cartridge 1 is properly loaded).

The cartridge 1 is inserted into the cartridge loading section 20 of a camera having a rectangular cylindrical shape as shown in FIG. The back plate 4 of 3 has a recess 1 which is a characteristic part of the present invention.
2 is provided. These recesses 12 are formed, for example, on both sides of a bridge portion 13 serving as an abutting member guide portion where the surface of the back plate 4 is left as is at the center of the case 3 in the width direction (direction perpendicular to the insertion direction A). Each recess 12 has a side wall 14 facing the end surface 11 on the insertion side, and a bottom wall 15 continuous with the side wall 14. is formed on a slope and continues to the surface of the back plate 4. As shown in FIG. 1, the leaf spring 5 is arranged so as to press against the center of the film 2, which has a processing liquid container 2a and a processing liquid trap 2b at its front and rear ends, respectively. An extra space is formed in the center of the back plate 4 where the spring 5 is arranged, and the recess 12 is provided using this space.

Next, the functions and effects of the cartridge 1 having the above configuration will be explained. As shown in FIG. 3, the cartridge loading section 20 of the camera into which the cartridge 1 is inserted is connected to the back plate 4 of the cartridge 1 to be inserted.
A contact member 22 is provided on the inner wall 21 facing the. This abutting member 22 is formed by molding, for example, plastic with high elasticity, and as shown in the enlarged view of FIG. ) and has a pressing portion 24 extending in the direction of . The abutting pawl 23 is rotatable in the direction of arrow B in the figure around a rotation shaft 25 that is fixed to the inner wall 21 and pivots the abutting member 22 between the abutting pawl 23 and the pressing portion 24. ing. The end of the pressing portion 24 is in contact with the inner wall 21, and the abutting claw 23 is also in contact with the inner wall 21 when the cartridge 1 is not loaded.

The abutment member 22 as described above is attached to the cartridge 1
A mechanism such as a shutter is designed based on the sensitivity of the film 2, and in a camera loading section 20 that is compatible with the film 2, it is attached to the center in the width direction of the loading section 20. On the other hand, mechanisms such as shutters are designed based on a sensitivity different from that of the film 2 in the cartridge 1, and the loading section 2 of the non-conforming camera cannot provide proper exposure to the film 2.
0', the abutting member 22' is attached at a position shifted to the left or right from the center in the width direction of the loading section 20' (see FIG. 5).

Cartridge 1 is inserted into the loading section 20 of the compatible camera mentioned above.
When inserted from the end surface 11 side, the pressing portion 24 of the abutment member 22 is pushed down by the end surface 11 of the cartridge 1, so that it is no longer in contact with the inner wall 21 and caught on the end surface 11 of the cartridge 1. The abutting claw 23 rotates toward the back plate 4 of the cartridge 1 and comes into pressure contact with the back plate 4. When the cartridge 1 is further fed into the back of the loading section 20, this contact claw 23 slides on the bridge portion 13 of the back plate 4, and the cartridge 1 is fed to a predetermined position where the end surface 11 touches the back wall 26 and is loaded normally. (solid line display in Figure 3).

On the other hand, when the cartridge 1 is inserted into the loading section 20' of the non-conforming camera, the abutment claw 23, which has rotated toward the back plate 4 of the cartridge 1 in the same way as in the above case, becomes depressed as the cartridge 1 is fed. It enters into the recess 12 and finally comes into contact with the side wall 14 of the recess 12 (represented by phantom lines in FIG. 3). This side wall 14 is set at a position where it comes into contact with the abutment pawl 23 during insertion of the cartridge 1, and therefore it is impossible to feed the cartridge 1 to the normal loading position. This prevents the cartridge 1 from being loaded into an unsuitable camera and being used incorrectly.

When all the films 2 are used up and the cartridge 1 is pulled in the opposite direction to the arrow A to remove it from the loading section 20 of the compatible camera, the contact claw 23 is urged toward the inner wall 21 by the elasticity of the pressing section 24. It returns to the position where it contacts this inner wall 21 and allows insertion of the next cartridge 1. When pulling out the cartridge 1 from the loading section 20' of the non-conforming camera that has prevented incorrect loading of the cartridge 1, the abutting claw 23, which is biased as described above, comes out of the recess 12 along the bottom wall 15. After that, install the inner wall 2 in the same way as above.
Return to the position where it touches 1.

In the above explanation, an example was given in which the bridge section was provided in the center of the recess, but the location of the bridge section may be changed depending on the sensitivity or type of film, and in extreme cases, the bridge section may be placed in the center of the recess. Of course, it may also have a crosslinked portion at the end. A camera compatible with these cartridges is provided with an abutment claw at a position on the inner wall of the loading portion corresponding to the bridge portion of the cartridge.

The abutting member 22 attached to the loading section 20 into which the cartridge 1 of the above embodiment is loaded is designed such that the abutting pawl 23 rotates so that the end face 11 of the cartridge does not get caught when the cartridge 1 is inserted. However, other methods may be used to prevent the end surface 11 from getting caught. For example, using the above embodiment, if the edge of the end face 11 on the abutting member 20 side is rounded and the abutting member is made into a simple leaf spring shape without the pressing part 24, the abutting member The tip is guided by the roundness and elastically bends toward the inner wall 21, and the end surface 11
It doesn't get caught.

Further, as shown in FIG.
A protrusion accommodating recess 130 is provided adjacent to the recess 112, and as shown in FIGS.
If the abutment member 122 made of a plate spring is used, when the cartridge 101 is inserted into the loading section 120, the protrusion 131 will come into contact with the back plate 104 of the cartridge 101, and the abutment claw 123 will be separated from the end surface 111. When the protrusion 131 is accommodated in the protrusion accommodation recess 130, the abutment member 122 is displaced toward the cartridge 101 due to its own elasticity, and the abutment claw 12
3 can come into contact with the side wall 114 of the recess 112.
Even in such a case, in a compatible camera, the abutting claw 123 may be made to slide on the bridge portion 113 between both the recesses 112.

Further, in the above explanation, a cartridge in which a bridge portion is provided in the recess has been described, but as shown in FIG. By forming a slope 16 that continues from the bottom wall 15 of 12 to the surface of the back plate 4, the abutment claw 22 of the compatible camera once falls into the recess 12 of the cartridge, but from there it continues to the surface again. Since the cartridge ascends along the slope 16 as the abutting member guide, the cartridge is loaded normally and the abutting claw 2 of the non-conforming camera
2' may be locked to the side wall 14 of the recess 12 so that no cartridge is loaded.

Cartridge 1, 101 of the embodiment described above
The cartridge of the present invention is designed to prevent incorrect loading due to film sensitivity incompatibility, but the cartridge of the present invention
It may be formed to prevent incorrect loading of other film types (for example, the above-mentioned spectral characteristics, etc.), or if multiple film types are not all compatible with the camera, such as film sensitivity and shooting light used. Of course, it is also possible to design it so that loading is prevented.

The cartridge 1, 101 having the recesses 12, 112 as described above has the recesses 12, 112 as described above.
112, it does not have any extra protruding parts to the outside, so the manufacturing and assembly equipment used to manufacture cartridges without such recesses can be used as is, or the same equipment can be used. It can be manufactured using slightly modified equipment. Therefore, the cartridge of the present invention may result in high costs if a cartridge without a function to prevent incorrect loading is already manufactured and then additional film types are added to prevent incorrect loading of the cartridge. It is economically advantageous.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a cartridge according to a first embodiment of the present invention, FIG. 2 is a perspective view of the cartridge,
FIG. 3 is a partially cutaway side view showing the relationship between the cartridge and the cartridge loading section of the camera, FIG. 4 is a partially cutaway side view showing an enlarged part of the loading section, and FIG. 5 is a partially cutaway side view showing the relationship between the cartridge and the cartridge loading section of the camera. FIG. 6 is a perspective view showing the cartridge of the second embodiment of the present invention;
FIG. 7 is a partially cutaway side view showing the relationship between the cartridge of the second embodiment and the cartridge loading section of the camera, and FIG. 8 is a perspective view showing an enlarged contact member provided in the cartridge loading section. FIG. 9 is a perspective view showing a cartridge according to a third embodiment of the present invention. 1,101...Film cartridge, 4,1
04...Back plate, 12,112...Recess, 13,1
13...Bridge part, 14,114...Side wall of recess,
16...Slope, 20, 20', 120...Camera cartridge loading section, 21...Inner wall of loading section, 2
2, 22', 122...Abutting member.

Claims (1)

[Claims] 1. In a film cartridge that is inserted and loaded into a cylindrical film cartridge loading section of a camera from one end side, when the cartridge is inserted, the insertion/loading portion is placed on the surface of the cartridge facing the inner circumferential wall of the loading section, facing toward the one end side. a recess having a side wall substantially perpendicular to the direction of the recess, and an abutting member guide portion that is aligned with the recess and smoothly extends to the cartridge surface;
The recess and the guide section are such that when a cartridge is inserted into the camera, the contact member attached to the inner wall of the cartridge loading section of the non-conforming camera enters the recess and abuts against and engages with the side wall during insertion, and the non-conforming camera is inserted into the camera. The arrangement position of the abutting member attached to the inner wall of the cartridge loading section is selectively set for each type of cartridge so that the abutting member does not slide on the guide part and come into abutting engagement with the side wall. Loading prevention film cartridge.