JPH08194289A - Photographic film cartridge and camera using the same - Google Patents

Abstract

PURPOSE: To take a photograph in focus even after a photographic film cartridge is left as it is in a camera for a long time. CONSTITUTION: This photographic film cartridge is equipped with a cartridge main body 1 turnably housing a spool 3 round which photographic film 2 is wound, flexible disks 7 provided at both ends of the spool 3, and a projection 7a formed to be extended from the outer periphery part of the disk 7 toward the film 2 side so that it may envelop the outermost periphery of the film 2 wound round the spool 3; the film 2 is prevented from getting loosened, and the projection 7a is deformed in the width direction of the film 2 so as to feed the leading edge of the film to the outside of the cartridge main body 1 by turning the spool 3, then only the leading edge part of the film necessary for film feeding operation is set to such width that it is enveloped by the projection 7a so that the film is prevented from getting loosened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film cartridge and a camera, and more particularly, to a film feeding type photographic film cartridge and a camera using the photographic film cartridge.

[0002]

2. Description of the Related Art Conventionally, photographic film cartridges described in US Pat. No. 5,251,840 and Japanese Patent Laid-Open No. 5-45801 have a flange formed by a flexible material fitted on both ends of a spool in a cartridge around which a photographic film is wound. The tongue-shaped projections integrally formed on the periphery of the photographic film partially wrap around the outermost periphery of the photographic film wound on the spool in the cartridge to prevent the photographic film from loosening. As a result, when the spool in the cartridge is rotated in the feeding direction, the photographic film rotates integrally with the spool in the cartridge without being loosened. Further, the protrusion is widened in the width direction of the photographic film in the vicinity of the entrance / exit of the photographic film provided in the cartridge body, and the photographic film is led out toward the entrance / exit of the photographic film from between them, so that the photographic film can be sent out. There is.

FIG. 12 is a front view showing an example of a film state when the above-mentioned cartridge is loaded in a camera.

The film 102 is wound around the spool 103 in the cartridge, and the film is held in the cartridge case 10.
It is stored in 1. Also, the spool 1 in the cartridge
Flange 10 made of flexible material on both ends of 03
5, 106 are loosely fitted, and the flanges 105, 106
The ring-shaped projections 105a and 106a are integrally formed along the outer peripheral edge of the film to prevent the film 102 from being loosened.

Further, the film 102 sent out from the cartridge into the camera has a photographing opening 108 of the camera.
It passes through the rear of the and is wound around the spool 107 in the camera. At this time, the film entrance / exit 10 of the cartridge
The flanges 105b and 106b in the vicinity of 4 are the film 1
By 02, it is expanded in the width direction of the film in an elastically deformed state. Further, on one end side in the width direction of the film 102,
Perforations 102a are perforated at predetermined intervals.

[0006]

However, when the above cartridge is used in a camera, as shown in FIG. 12, the film 102 has a pressing force F due to elastic deformation of the flanges 105b and 106b in the vicinity of the film entrance / exit 104 of the cartridge.・ I received F '. Therefore, FIG.
If the camera is left for a long time in the state shown in, the film 10
In No. 2, the pressing force F · F ′ causes a deformation that does not return in a short time.

13 and 14 are views showing a cross section of the film 102 in the width direction, FIG. 13 is a view showing a curling state of the film in a normal state, and FIG. 14 is a pressing force F.
FIG. 6 is a diagram showing a curling state of the film after receiving F ′ for a long time.

In FIG. 13, the photographic film generally has a curling characteristic toward the dairy material surface 102b, and the curling amount C1 in the normal state is within a predetermined range. However, the portion of the film 102 that receives the pressing force F · F ′ for a long time undergoes a large curling amount C2, which exceeds a predetermined range, as shown in FIG.

15 and 16 are sectional views A in FIG.
FIG. 15 is a view showing A ′, FIG. 15 is a cross-sectional view showing a state of the film in a normal state, and FIG. 16 shows a state in which the camera is left for a long time and then one frame is wound up to perform a pressing force F · F ′.
FIG. 11 is a cross-sectional view showing a state of the film when the next frame 102c that has received the image is positioned on the photographing opening 108 of the camera. Here, the cross section AA ′ is a cross section at a portion where the portion to which the pressing force F · F ′ is applied to the film 102 when left for a long time is moved to the photographing opening 108 by the film winding operation after being left. Is.

In FIG. 15, a pair of known film rail surfaces 109a and a pair of pressure plate rail surfaces 109b are provided above and below a photographing opening 108 provided in the camera body 109, and a pressure plate 110 is provided on the pressure plate rail surface 109b. Is pressed. In the normal state, the film 102 is almost in contact with the pressure plate 110 within the photographing opening and maintains a flat state. Even when the film 102 floats from the pressure plate 110 due to variations in the film 102 and changes in the usage environment, the floating amount Z1 is within a range of approximately 0 to 0.02 mm.

However, as shown in FIG.
In the portion where 02 receives the pressing force F · F ′ for a long time, a large curling is pressed by the pressure plate 110, so that the curling in the central portion is reversed, and the film 102 is pressed by the pressure plate 110.
It is in a state where it largely jumps out from the front of the camera. As a specific example, the pressing force F · F ′ is set to about 30 g and 2
Immediately after being left for 4 hours and being wound up by one frame, the floating amount Z2 in the central portion shown in the figure becomes about 0.03 to 0.10 mm. When shooting is performed in this state, the lens image-forming surface and the film photosensitive surface are largely displaced in the optical axis direction at the center of the screen, so that a photograph is taken out of focus.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a photographic film cartridge and a camera capable of taking a photograph in focus even after being left in the camera for a long time.

[0013]

To achieve the above object, a first photographic film cartridge according to the present invention comprises a spool around which a photographic film is wound, and a cartridge body in which the spool is rotatably housed. A flexible flange provided on at least one end of both ends of the spool, and an outer peripheral portion of the flange extending toward the film side so as to wrap around the outermost periphery of the photographic film wound on the spool. A protrusion formed so as to prevent the photographic film from being loosely wound, and by rotating the spool, the protrusion is deformed in the width direction of the photographic film, so that the photographic film is exposed to the outside of the cartridge body. Film required for film feeding operation in a photographic film cartridge that feeds the leading edge of the film Only end portion, characterized in that the wrap is looseness preventing possible width by the projecting portion.

To achieve the above object, the second photographic film cartridge according to the present invention is the same as the first photographic film cartridge, wherein the film width at the leading end portion of the photographic film is the same as that of the photographic screen imprinting portion that follows. The feature is that it is made larger than the film width.

In order to achieve the above object, a camera according to the present invention is a camera using a photographic film cartridge having films having different film widths in at least a part thereof. It is characterized in that a retractable guide means for positioning in the direction is provided.

[0016]

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

FIG. 1 is an exploded perspective view showing the construction of a photographic film cartridge according to an embodiment of the present invention and a camera using the photographic film cartridge. Further, FIG. 2 is a cross-sectional view of an essential part of the photographic film cartridge.

1 and 2, the cartridge body 1 is composed of two parts, an upper case 1a and a lower case 1b. The photographic film 2 is rotatably housed in the cartridge body 1 in a wound state, with the end thereof locked to the spool 3. Ports 4a and 4b are integrally formed on the upper case 1a and the lower case 1b, respectively, and the openings formed at these joints serve as the film delivery port 4 when the film 2 is fed out and rewound. Further, openings 5a and 5b into which the spool shaft portion 3a is rotatably fitted are provided on both sides or one side of the side surfaces of the upper case 1a and the lower case 1b, and the upper case 1a and the lower case 1b are integrally formed. To form the shaft opening 5. On the other hand, arc-shaped ribs 6a, 6b are provided on the inner walls of the side surfaces of the upper case 1a and the lower case 1b so as to project inward along the outer circumference of the disk 7.

The disk 7 is loosely fitted to both ends of the spool 3 and integrally formed with an annular projection 7a along the outer peripheral edge of the disk 7 for preventing the film 2 from being loosely wound. The axial position of the disc 7 is restricted by the ribs 6a and 6b of the cases 1a and 1b. The ribs 6a, 6b
Is not provided near the ports 4a and 4b. Further, a tip separation claw 9 for film is provided at the port portion 4b of the lower case 1b. When the photographic film 2 rotates as the spool 3 rotates, the tip separating claw 9 scoops up the film 2 and guides it toward the film feed port 4.

A light-shielding telemper 15 is attached to the inner walls of the port portions 4a and 4b. In addition, the above-mentioned disc 7
Is made of a material such as polypropylene or polyethylene, and has a thin wall and flexibility.

FIG. 3 is a front view showing a state in which the film 2 is pulled out from the photographic film cartridge of this embodiment.

As shown in the figure, the film 2 has a leading end feeding portion 2b having a predetermined length including a leading end portion 2a and a width b1, and a width for imprinting a screen 2e following the feeding portion 2b. and a photographing unit 2c formed by b2,
Further, the imaging unit 2c has a required performance 2d.
Etc. are also provided.

The film width b1 of the above-mentioned tip feeding portion 2b
Is set to be larger than the interval b3 between the protrusions 7a of the disk 7 shown in FIG. Further, the film width b2 of the photographing section 2c is formed smaller than the width b1 of the front end feeding section 2b. Therefore, as shown in FIG. 2, the film 2 has a narrow width on the inner peripheral side and a wide portion wound on the outer peripheral side.

FIG. 4 is a rear view of the main part of the camera of this embodiment with the rear lid removed, and FIG. 5 is a cross-sectional view of the main part showing the AA 'cross section in FIG. In addition, FIG.
[FIG. 3] is a central sectional view of an essential part of the camera. In addition, in FIG.
6 to 6 show a state where the film 2 is completely loaded in the cartridge body 1, that is, the film 2 is not pulled out.

The camera body 21 is provided with a cartridge chamber 22 for loading the cartridge 1 and a film chamber 23 in which a spool 24 for winding the film 2 is arranged. Further, in order to determine the position of the film 2 with respect to the aperture 30 that determines the exposure screen, a wide guide rail 25 that guides the leading end feeding portion 2b of the film 2, a film rail 26 that determines the film thickness direction position, and a film The pressure plate 27 is arranged.

Further, from one side of the camera body 21,
A narrow guide lever 28 having a guide portion 28b that rotates about a rotary shaft 28a and guides the width direction of the photographing portion 2c of the film 2 is pivotally supported by a support portion 27b of the pressure plate 27 (see FIG. 6). . Further, a narrow guide lever 29 having the same structure as the narrow guide lever 28 is arranged on the other side of the camera body 21. The camera body 21 is formed with a recess 31 into which the tips 28c and 29c of the narrow guide levers 28 and 29 are inserted. Further, the spring 32 is provided with the narrow guide levers 28, 29.
Is urged toward the camera body 21 side.

Next, the operation of the photographic film cartridge of this embodiment will be described.

When the film 2 is completely wound inside the cartridge body 1, the protrusions 7 formed on the disk 7
"a" encloses the wide portion of the feeding portion 2b of the film 2 and the looseness of winding is restricted.

Next, when the spool 3 is rotated in the film feeding direction, the film 2 rotates together with the spool 3. When the film tip 2a moves to the port 4b,
It is picked up by the tip separation claw 9 and guided to the outlet 4 from the cartridge body 1. When the spool 3 is further driven to rotate, the film 2 spreads the protrusion 7a of the disc 7 as shown in FIG. 2, and since there is no regulation by the ribs 6a and 6b in this portion, the disc 7 is curved outward. The film 2 is sent out from the outlet 4 while being deformed.

When the film 2 of a predetermined length is fed out and the locking on the take-up spool on the camera side is completed, the feeding drive is stopped. The film 2 is pulled out by the winding drive of the film 2 on the camera side, and the photographing unit 2c comes out. Inside the cartridge body 1, as shown in FIG.
The projection 7a is not spread because the width b2 of the photographing portion 7a of the film 2 is narrow.

Therefore, the photographing section 2c has a projection 7a on the disk 7.
Does not deform because it is not subjected to force. Therefore, accurate focus can always be obtained without the deformation of the film 2 remaining after being loaded in the camera for a long time.

The width b2 of the photographing portion 2c of the film 2 does not need to be smaller than the width b3 between the disc protrusions 7a, and the width b2 is smaller than the width b3 at a level at which the film 2 does not cause a problematic deformation. May be slightly larger.

The delivery portion 2b of the film 2 may be formed by a method such as attaching a separate member, or the rigidity may be increased to improve the delivery performance.

Next, the operation of the camera body 21 side of this embodiment will be described with reference to FIGS.

4 to 6 show a state before the film 2 is sent out.

That is, the narrow guide levers 28 and 29 are urged by the concave portions 31 on the surface of the camera body 21 and the distal ends 28 thereof are guided.
c and 29c have entered. The passage of the film 2 is a portion surrounded by the pressure plate 27, the film 26, and the guide portions of the wide guide rail 25 or the narrow guide levers 28 and 29.

7 to 9 show a state in which the film front end portion 2a is sent out from the cartridge main body 1, and FIG. 7 is a rear view of the main part of the camera main body of this embodiment with the rear lid removed. FIG. 8 is a cross-sectional view of a main part showing a cross section taken along the line AA ′ in FIG. 7. Further, FIG. 9 is a central sectional view of the main part of the camera.

At this time, since the front end 2a of the film 2 is wide, it is restricted in the width direction by the wide guide rail 25. When the film 2 advances, the leading end 2a moves to the guide lever 28.
Hit the tip portion 28c of the. Since the tip end portion 28c has a tapered shape, the film tip end 2a pushes up the guide lever guide portion 28b against the biasing force of the spring 32. By rotating the guide lever 28 around the rotation shaft 28a, the passage of the film 2 is opened. When the film 2 is further fed, the guide lever 29 also retracts.

10 and 11 show a state in which the film 2 is further fed and wound around the film take-up spool 24 of the camera body 21, and the feeding portion 2b has passed the guide lever 28. FIG. FIG. 11 is a rear view of the main part of the camera body of the present embodiment with the rear lid removed, and FIG. 11 is a cross-sectional view of the main part showing the AA ′ cross section in FIG. 10.

At this time, when the photographing section 2c reaches the position of the guide lever 28 in a state where the feeding section 2b is regulated by the wide guide rail 25, the photographing section 2c has a narrow film width, and therefore the tip 28c of the guide lever 28 has a film. It deviates from 2. Therefore, the guide lever 28 is again rotated by the urging force of the spring 32, and the tip end portion 28c thereof falls into the recess 31 of the camera body 21.

The guide portion 28b regulates the width direction of the photographing portion 2c of the narrow film 2.

When the film 2 is further fed, the film photographing section 2c moves to the position of the guide lever 29. The guide lever 29 performs the same operation as the guide lever 28 and guides in the film width direction. Therefore, the film 2 is positioned by the two pairs of the guide levers 28 and 29, and the screen is exposed at the correct position.

When the film 2 is rewound onto the cartridge body 1 again, the tip ends 28c of the guide levers 28 and 29,
The film 29c has the same taper shape as that for the rewinding and feeding, and the film 2 can perform the same operation as the feeding. Details are omitted here.

Since the camera body is constructed as described above,
Even if a film cartridge having a wide tip portion is used, the position of the film can be accurately determined and the film can be fed.

Further, in the delivery type film cartridge using the flexible flange, the film is not deformed at the image imprinting portion, and a focused photograph can be obtained.

[Appendix] According to the embodiments of the present invention as described in detail above, the following configurations can be obtained. (1) A spool around which a photographic film is wound, a cartridge body that rotatably accommodates the spool, a flexible flange provided on at least one end of both ends of the spool, and the spool. It has a protrusion formed on the outer peripheral portion of the flange so as to wrap the outermost periphery of the wound photographic film, and prevents the film from being loosened, and by rotating the spool, the protrusion is formed into the width of the photographic film. In a photographic film cartridge that is deformed in the direction to feed the film tip out of the cartridge body, only the film tip portion necessary for the film feeding operation is wrapped with the protrusion of the flexible flange to prevent winding looseness. A photographic film cartridge with a wide width.

(2) A spool around which a photographic film is wound, a cartridge body that rotatably accommodates this spool, a flexible flange provided on the spool, and a photographic film wound around the spool. With a protrusion formed on the outer peripheral portion of the flange so as to wrap the outer periphery, while preventing the film from loosening, by rotating the spool, the protrusion is deformed in the width direction of the photographic film, In a photographic film cartridge in which the leading end of the film is fed out of the cartridge body, only the leading end of the film necessary for the film feeding operation is wrapped by the protrusion of the flexible flange to have a width capable of preventing winding looseness. A featured photographic film cartridge.

(3) A spool around which a photographic film is wound, a cartridge body that rotatably accommodates the spool, a flexible flange provided at at least one of both ends of the spool, and the spool. As to wrap the outermost periphery of the photographic film wrapped around
In a photographic film cartridge having a protrusion formed on the outer peripheral portion of the flange, preventing the film from being loosened and rotating the spool to send the film tip out of the cartridge body,
Only the film tip required for film feeding operation,
A photographic film cartridge characterized by having a width capable of preventing winding looseness by being wrapped by the protrusion of the flexible flange.

(4) A spool around which a photographic film is wound, a cartridge body that rotatably accommodates the spool, a flexible disk provided at at least one of both ends of the spool, and It has a protrusion formed on the outer peripheral portion of the disk so as to wrap the outermost periphery of the photographic film wound on the spool, and prevents the film from loosening, and the rotation of the spool causes the film cartridge to rotate. In the photographic film cartridge in which the projection is deformed in the width direction of the photographic film in the vicinity of the entrance and exit of the film so as to send out the film front end to the outside of the cartridge body, only the film front end part related to the film feeding operation is A photograph characterized by having a width that can be wrapped around the protrusions of the disc to prevent winding looseness. Film cartridge.

(5) A spool around which a photographic film is wound, a cartridge main body that rotatably accommodates the spool, a flexible flange provided at at least one of both ends of the spool, and the spool. As to wrap the outermost periphery of the photographic film wrapped around
The protrusion is formed on the outer peripheral portion of the flange to prevent the film from being loosened, and the rotation of the spool causes the protrusion to be deformed in the width direction of the photographic film, so that the film is transferred to the outside of the cartridge body. In a photographic film cartridge with the leading edge fed, only the leading edge of the film necessary for feeding the film is wrapped by the protrusion of the flexible flange to have a width capable of preventing winding looseness, and continues after the leading edge of the film. A photographic film cartridge, characterized in that the film width of the photographing screen imprinted portion is set so that the film is not deformed by the flange.

(6) Above (1), (2), (3),
In the item (4) or (5), the film width of the film leading end portion involved in the film feeding operation is made larger than the film width of the photographing screen imprinting portion which follows, and the film width of the film leading end portion is flexible. Photographs characterized in that the flange position is provided so that the film can be sent out by deforming the above-mentioned flange in the width direction, and that there is no film deformation due to the above-mentioned flange with respect to the film width of the photographing screen imprinting part. Film cartridge.

(7) A spool around which a photographic film is wound, a cartridge main body accommodating the spool in a rotatable manner, a flexible flange provided at at least one of both ends of the spool, and the spool. As to wrap the outermost periphery of the photographic film wrapped around
It has a projection formed on the outer peripheral portion of the flange to prevent the film from being loosened and to rotate the spool so as to send the leading end of the film out of the cartridge body. In a camera that uses a photographic film cartridge that stores a film having a width capable of preventing winding looseness by wrapping only the leading end of the film with the protrusion of the flexible disc, a narrow film among the films having different widths A camera provided with retractable guide means for positioning the width in the width direction.

(8) In the above item (7), the guide means is provided so as to be retractable in the photographing optical axis direction.

(9) In the camera described in the item (7), the guide means is retracted by the fed film.

(10) In a camera using a photographic film cartridge containing at least a part of films having two different film widths, a cartridge loading chamber for loading the film cartridge and a film wound from the film cartridge. A take-up shaft, a film feed path provided between the cartridge loading chamber and the take-up shaft, and a film feed path provided on the film feed path and fixed in the width direction with respect to one film width. A first guide means and a second guide means that is provided so as to be able to move forward and backward in the film passage and that is positioned in the width direction with respect to the width of the other film by advancing. A camera to do.

[0056]

As described above, according to the present invention, it is possible to provide a photographic film cartridge and a camera capable of taking a photograph in focus even after the photographic film is left in the camera for a long time.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a photographic film cartridge which is an embodiment of the present invention and a camera using the photographic film cartridge.

FIG. 2 is a cross-sectional view of relevant parts showing a state in which a leading end portion of a film loaded from the photographic film cartridge of the above embodiment is pulled out.

FIG. 3 is a front view showing a state in which a loaded film is pulled out from the photographic film cartridge of the above embodiment.

FIG. 4 is a rear view of the main part of the camera of the above embodiment with the rear lid removed, when the film is not pulled out from the photographic film cartridge of the above embodiment.

5 is the A in FIG. 4 when the film is not pulled out from the photographic film cartridge of the embodiment.
It is a principal part sectional view which showed the A'section.

FIG. 6 is a central cross-sectional view of the essential parts of the camera of the above embodiment when the film is not pulled out from the photographic film cartridge of the above embodiment.

FIG. 7 is a rear view of the main part of the camera of the above embodiment with the rear lid removed, when the film front end is fed out from the photographic film cartridge of the above embodiment.

FIG. 8 is a view of A in FIG. 7 when the front end of the film is sent out from the photographic film cartridge of the above embodiment.
It is a principal part sectional view which showed the A'section.

FIG. 9 is a central cross-sectional view of the main parts of the camera of the above-described embodiment when the front end of the film is sent out from the photographic film cartridge of the above-described embodiment.

FIG. 10 is a rear view of the main part of the camera of the above embodiment, with the rear lid removed, when the film is further fed out from the photographic film cartridge of the above embodiment.

FIG. 11 is a cross-sectional view of essential parts showing a cross section taken along the line AA ′ in FIG. 10 when the film is further fed out from the photographic film cartridge of the above-described embodiment.

FIG. 12 is a front view showing an example of a film state when a conventional cartridge is loaded in a camera.

FIG. 13 is a cross-sectional view in a width direction showing a conventional curling state of a film in a normal state.

FIG. 14 is a cross-sectional view in the width direction showing a conventional curling state of a film after being subjected to a pressing force for a long time.

FIG. 15 is a sectional view showing a section AA ′ in FIG. 12 in a conventional normal film state.

FIG. 16 is a cross-sectional view taken along line A in FIG. 12 in a state in which a conventional camera is wound up for one frame after being left for a long time, and the next frame subjected to a pressing force is positioned on the photographing opening of the camera.
It is sectional drawing which showed A '.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cartridge body 1a ... Upper case 1b ... Lower case 2 ... Photo film 2a ... Tip part 2b ... Tip sending part 2c ... Photographing part 3 ... Spool 3a ... Spool shaft part 4 ... Film sending port 4a, 4b ... Port part 5 ... Shaft part opening 5a, 5b ... Opening part 6a, 6b ... Rib 7 ... Disk 7a ... Protrusion 9 ... Tip separation claw

Claims (3)

[Claims] 1. A spool around which a photographic film is wound, a cartridge body in which the spool is rotatably accommodated, a flexible flange provided on at least one of both ends of the spool, and the spool. A protrusion formed to extend from the outer peripheral portion of the flange toward the photographic film side so as to wrap the outermost periphery of the wound photographic film, and prevent loosening of the photographic film. In a photographic film cartridge in which the protrusion is deformed in the width direction of the photographic film by the rotation of the spool so as to feed the film leading edge out of the cartridge body, only the film leading edge required for the film feeding operation. To
A photographic film cartridge characterized in that it has a width capable of preventing winding looseness by being wrapped by the above-mentioned protrusion. 2. The photographic film cartridge according to claim 1, wherein the film width at the leading end portion of the photographic film is larger than the film width at the photographing image recording portion that follows. 3. A camera using a photographic film cartridge having films having different film widths in at least a part thereof, and provided with retractable guide means for positioning a film having a narrow film width among the films having different widths in the width direction. A camera characterized by that.