JPH09319034A - Film cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film cartridge including a film constituted so that the feeding speed of a film is kept constant while an existing film spool shaft is used as it is and an adverse effect exerted on the detecting action of a photographing frame position and a magnetic recording action is reduced. SOLUTION: The cartridge is constituted so that the film F is fed out to the outside of a cartridge main body by rotating the spool shaft 1 in the feeding- out direction of the film. In such a case, it is molded so that flexural rigidity caused by the elasticity of the position 2 of the film easily becoming a fold when the film F is fitted to the shaft 1 at the end part 6 thereof and the film part near it, for example, is relatively reduced from the other part. Or it is molded by considering a shape having a lightening part 7 which is not superposed on the secondly wound film at the fold position 2 of the film wound round the shaft 1 first and near it or thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film cartridge for storing a film, for example, detecting the error of the position of a photographed frame, damaging the stability of film feeding of a camera capable of magnetically recording and reproducing photographed information on the film, The present invention relates to a film edge shape that reduces "load unevenness" of a film that causes a problem in magnetic recording and reproduction due to a change in film feeding speed.

[0002]

2. Description of the Related Art In recent years, a film cartridge having a photographic film on which a magnetic recording layer is formed and capable of recording and reproducing various kinds of information, and which can be loaded into a camera without pulling out the leading end of the film from the cartridge body in advance. A camera system using is proposed. As a spool for photographic film used in such a camera system,
A photographic film is formed by moving a locking claw that locks the photographic film in the photographic film insertion opening formed on the winding shaft and a rib that presses the photographic film toward the locking claw in a direction perpendicular to the forming surface. The one in which the lock is engaged is proposed in Japanese Patent Laid-Open No. 6-266054 as shown in the sectional view of FIG.

Regarding the photographic film cartridge in which the film is stored in a "roll", a photographic film cartridge in which the film is wound concentrically with respect to the center of the spool shaft is disclosed in, for example, Japanese Unexamined Patent Application Publication No. Hei 4 (1999) -4. -2
According to this proposal, it is possible to rotate the spool shaft with a relatively small torque when rotating the spool shaft in the film feeding direction and the winding direction.

[0004]

A camera system capable of recording and reproducing various kinds of information on a magnetic recording film, which has been proposed in recent years (for example, APS (Advanced Photo System))
Then, while the film is being advanced one frame after shooting, the magnetic head built in the camera magnetically records shooting data and the like. As a recording method for this purpose, a digital recording method using a combination of binary data of “0” and “1” is being studied so that it is not easily affected by noise. However, in order to perform magnetic recording so that the data "0" and "1" can be accurately identified, the film feeding speed is kept constant, or the feeding speed is accurately detected to determine the feeding state. It is necessary to create a synchronous clock for magnetic recording in accordance with the above.

At present, a spool shaft disclosed in, for example, Japanese Patent Laid-Open No. 6-266054 has been proposed as a film cartridge for the above-mentioned camera system. With this spool shaft, the film locking force of the film can be reduced without lowering the film locking force. Easy to put on. However, with this spool shaft, the following phenomena and problems caused by them occur.

When the film is stored in the cartridge and is pulled out with a uniform force from the state in which the film is "densely" wound around the spool shaft, the pulling speed is not constant, and the film is wavy as shown in FIG. It becomes the shape of a simple graph curve. In other words, the "uneven load" of the drawer occurs. Therefore,
If you pull out with the same force, the feeding speed becomes uneven,
This may cause a great adverse effect on the magnetic recording (for example, jitter), resulting in the inability to read or reproduce the magnetic recording.

For example, in the case of a film feeding system in which one perforation for each frame is detected by two sensors to control the position of a desired photographic frame, the first sensor mounted at a position slightly separated from each other. When using the second sensor and the second sensor, the first sensor detects the perforation to be turned on to reduce the film feeding speed, and when the second sensor detects the perforation to be turned on, the film feeding is stopped. . In this case, the behavior of the film must be constant until both the first sensor and the second sensor are turned on and the film stops. That is, when the first sensor is turned on, if the feeding speed is rapidly increased as shown in the graph of FIG. 14, the film is not decelerated, so that the second sensor is turned on and the film is turned on. Even if a stop signal is output, there is a risk that the frame does not stop exactly at the shooting frame position but shifts. Furthermore, if the shifts occur irregularly, the shot frames may overlap and double exposure may occur.

In this phenomenon, when the drawing speed becomes slow, that is, when the drawing load becomes large, the rotation of the spool shaft is often stopped even though the film is being drawn. When it is further pulled out, the spool shaft rapidly rotates, and at the same time, the withdrawal load is reduced, and the withdrawal speed is increased. Such a phenomenon often occurs when the film is pulled out more than half. In addition, a film with a long specification is more likely to occur. Therefore, when disassembling the film cartridge and investigating the cause by investigating the behavior of the spool shaft and the film, when the above phenomenon occurs,
As shown in FIG. 15, the film is in the state of being wound around the spool shaft in an elliptical shape, so that the rotation of the spool shaft is not constant.

Further, in a film cartridge having elastic flanges provided above and below for feeding the film accommodated in the film cartridge from the port opening by rotating the spool shaft in the film feeding direction, The following causes are estimated. Normally, when the film is tightly wound, the film is pulled out as shown in FIG. Drawing direction 20 of film F, direction 2 of frictional force between flange 10 and film F
1, the resultant direction 23 of the pull-out force and the frictional force, and the rotation direction 22 of the spool shaft 1 work as shown in FIG. In this state, the frictional force acts in the rotation direction of the spool shaft 1 and the film F is also tightly wound.
The spool shaft 1 rotates by an amount corresponding to the pulling out. But,
When the number of windings of the film F decreases and the winding method of the film F becomes elliptical as shown in FIG. 17, the frictional force generated between the film F and the flange 10 substantially coincides with the direction 21 shown. Therefore, the total force of the amount of pull-out force and the frictional force is in the direction of 23 shown, and does not work in the direction of rotating the spool shaft 1. Further, since the film F is loose in an elliptical shape, only the film F is pulled out. When only the film F is further pulled out in this state, the film F is charged like a spring of the mainspring, and when the spring force becomes larger than the friction force 21, the spool shaft 1 is rotated at a stroke and the film F is pulled out. The speed changes, that is, the "load" changes.

The cause of these phenomena is "rolling" of the film.
When the film F is loosened, the film F is loosened in an elliptical shape. The reason for this will be described below. The insertion opening for inserting the film F into the spool shaft 1 as shown in FIG.
The film F, which is in the diametrical direction passing through substantially the center and is locked by the locking portion 4, is wound such that the angle formed by the direction of the film end portion at the insertion opening and the tangent line is, for example, 90 ° or less. When the film is pulled in the direction and wound on the peripheral surface of the spool shaft 1, a force for bending the film is generated. On the other hand, a strong elastic force 11 as a reaction force against this force is generated in the vicinity of the winding start portion 2 of the film F. If the adhesiveness of the wound film is deteriorated due to the elastic force at this time, the film may be wound "wrinkle" around the spool shaft and loosen in, for example, an elliptical shape.

For this reason, JP-A-4-248546 is used.
In the publication, when the film is wound around the spool shaft,
There has been proposed a film cartridge that suppresses the elastic force by pressing the winding start portion around the spool shaft center. However, in this proposal, not only is the method of attaching the film to the spool complicated, but the parts are composed of two separate parts, and it is also difficult to attach and remove the film without breaking the cartridge.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to wind a film that keeps the film feeding speed constant and reduces the adverse effects on the detection of the photographing frame position and the magnetic recording even when the existing film spool shaft is used. The purpose is to provide a film patrone possessed.

[0013]

In order to solve the above-mentioned problems and achieve the object, the present invention takes the following means. [1] A first changing portion that changes from a straight portion to a curved portion or a second changing portion that changes curvature is provided on an outer peripheral portion, and a locking portion that locks a film is provided on the straight portion or the curved portion. One end is locked to the cartridge shaft and the locking portion of the cartridge shaft, and the rigidity before and after the change portion of the first or second change portion is smaller than the rigidity of the actual exposure portion at least on the first circumference. And a film on which a bent portion having a curved line is formed. [2] The bent portion of the film has at least one of a portion formed by lightening or a notched portion set to have a width narrower than the film width. [1] The film cartridge described is provided. [3] A film cartridge having a locking portion for locking the film on the cartridge shaft, wherein the locked film is extended from the locking portion to the outer peripheral portion of the cartridge shaft and wound by a predetermined amount. Has a first portion extending from the engaging portion and located on the first periphery in the vicinity of the outer peripheral portion of the patrone shaft, and a second portion on the second periphery located in the vicinity of the outer peripheral portion of the patrone shaft. The film cartridge is characterized in that the first portion and the second portion are set so as not to overlap with each other.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the accompanying drawings including a plurality of embodiments. (First Embodiment) FIGS. 1A, 1B, 2 and 3
Thus, a first embodiment according to the present invention will be illustrated. FIG. 1A is a sectional view showing a state in which the end portion of the film F is wound around the spool shaft 1. The "spool shaft" mentioned here corresponds to the shaft of the film cartridge of the present invention, that is, the "patrol shaft" in the claims.

As shown, the film F is attached to the spool shaft 1.
The insertion port for inserting the tip of the is substantially provided in the diametrical direction passing through the axis. That is, the spool shaft 1 for winding the film of the film cartridge has a cross-sectional shape having a slit-like clearance as shown in the figure formed near the center of the spool shaft 1 in the longitudinal direction of the shaft. The film F locked here is pulled in the winding direction and wound up along the circumferential surface of the spool shaft 1. As a result, a predetermined elastic force 11 is generated in the vicinity of the winding start portion 2 of the film F depending on the type of the film, but if the elastic force 11 is extremely small, it is canceled by this winding force, and Spool shaft 1 corresponding to winding start section 2
If there is no abrupt change in the curvature of the film F, the film F will be wound along the outer peripheral surface of the spool shaft 1 concentrically with almost no looseness. However, the shape and the curvature of this portion of the spool shaft 1 are various according to the existing spool shaft.

More specifically, when the spool is inserted into a slit formed on the outer peripheral surface of the spool shaft 1 of the film cartridge shown in FIG. 1 (a) and the spool shaft 1 is started to rotate by a predetermined driving force, the winding is performed. The start portion 2 has a portion where the angle formed by the slit and the outer peripheral surface changes abruptly by 90 ° or less (however, the spool shaft 1 having two peripheral surfaces having different curvatures as shown in FIG. 1B). In the case of (including the part where the curvature is switched), the elastic force 11 due to the bending of the film causes a force to swell to the outside inevitably, and if it is strongly wound, a "crease" may be formed on the film surface. .

Therefore, in the films F1 and F2 of the present invention as shown in FIGS. 2 and 3, in order to make this elastic force as small as possible, the ends of the films are formed into the shape as shown. There is. That is, the shape of the film F1 (FIG. 2) and the film F2 (FIG. 3) in the vicinity of the fold position 2 where the film F is about to be folded with the film F wound on the spool shaft 1 is different from that of the other film. The shape is narrower than the part.
Specifically, the shape of the end portion 6 of the film F1 shown in FIG.
Approximately 1/3 of the original film width over a given length
It is formed to a width of a certain degree. On the other hand, the shape of the leading end of the film F2 shown in FIG. 3 has a width of about 1/3 of the original film width only at a portion extending over a predetermined length at the fold position 2 where the film will be folded. It is formed in a “constricted” shape with such a notch 9.

In addition to the above-described form of locking,
For example, as shown in FIG. 1 (b), a set of locking holes 3 relating to a claw-shaped or projection-shaped locking portion 4 provided on a part of the peripheral surface of the spool shaft 1 is formed. . The exposed surface of the film F, the end portion of which is locked to the locking portion 4 of the spool shaft 1, is wound along the outer peripheral surface of the spool shaft 1 and stored in the film cartridge.

(Operation 1) Therefore, when the film F is about to be bent sharply, for example, 90 ° or less as shown in FIG. 1A because the rigidity in the longitudinal direction near the fold position 2 is reduced. The magnitude of the elastic force 11 in this part of the is reduced.

According to (Effect 1), since the elastic force 11 due to the bending of the film F is reduced, even if the film F tends to loosen and the film F tends to loosen, the winding of the film F tends to occur. The state of is distorted,
It does not have an elliptical shape and is concentric with the axial center of the spool shaft 1. As a result, it is possible to suppress "load unevenness" when the film is pulled out, and as a result, it is possible to reduce the adverse effect on magnetic recording and the effect on frame position detection.

(Second Embodiment) Referring to FIGS. 1 and 4,
2 illustrates a second embodiment according to the present invention. At the end of the film F3 shown in FIG. 4, the film F3 is wound around the spool shaft 1 at a position 2 (that is, a position indicated by a chain line) where the film F is about to be folded. A plurality of slit-shaped lightening portions 7 are provided in parallel with the longitudinal direction of the film over a predetermined length. A set of locking holes 3 is provided near the leading edge of the film.

(Operation 2) Therefore, since the rigidity in the longitudinal direction near the fold position 2 is reduced, the film F is formed as shown in FIG.
Elastic force 1 when bent to 90 ° or less as shown in
The size of 1 is reduced.

(Effect 2) Accordingly, since the elastic force 11 due to the bending of the film F is reduced, even if the adhesion of the film F deteriorates and the film F tends to loosen,
The winding state does not become distorted or elliptical, but is concentric with the axial center of the spool shaft 1. As a result, it is possible to suppress "load unevenness" when the film is pulled out, and as a result, it is possible to reduce the adverse effect on magnetic recording and the effect on frame position detection.

(Third Embodiment) A third embodiment according to the present invention will be illustrated with reference to FIGS. 1, 5 and 6. The films F4 and F5 show the characteristic shapes of the end portions of the film in this embodiment. Film F shown in FIG.
The reference numeral 4 forms one rectangular hole portion 7 over the portion at the position 2 where the film is about to be folded while the film is wound around the spool shaft 1. Also, the film F5 shown in FIG.
A large number of, for example, circular hole portions 7 are formed in and near the portion related to.

That is, in the state where the film is wound around the spool shaft 1 in FIG. 1, one or a plurality of holes are provided at the position 2 where these films will be folded and in the vicinity thereof to reduce the rigidity of the film. There is. A set of locking holes 3 is provided near the leading edge of the film.

(Operation 3) As a result, the rigidity in the longitudinal direction in the vicinity of the fold position 2 is reduced, so that the film F in FIG.
As shown in, the magnitude of the elastic force 11 of the film F when bent to 90 ° or less decreases.

(Effect 3) Therefore, since the elastic force 11 due to the bending of the film F is reduced, even if the film F tends to loosen due to poor adhesion to the circumferential surface of the spool shaft 1 and the film F tends to be loosened. The state of is distorted,
It does not have an elliptical shape, but is concentric with the axial center of the spool shaft 1. As a result, it is possible to suppress "load unevenness" when the film is pulled out, and as a result, it is possible to reduce the adverse effect on magnetic recording and the effect on frame position detection.

(Fourth Embodiment) FIGS. 1, 7, and 8
Thus, a fourth embodiment according to the present invention will be illustrated. The film F6 shown in FIG. 7 shows the characteristic shape of the film end portion according to the present embodiment. That is, in the film F6, the thickness t at the position 2 where the film F is bent in the state where the film F is wound around the spool shaft 1 and the thickness t in the vicinity thereof are determined as shown in the cross-sectional view of the film in FIG. The thin film portion 12 is formed in an arc shape so as to be thinner than the thickness T (that is, T> t). A set of locking holes 3 is provided near the leading edge of the film.

(Operation 4) As a result, the rigidity in the longitudinal direction in the vicinity of the fold position 2 is reduced, so that the film F is formed as shown in FIG.
The magnitude of the elastic force 11 when bent to 90 ° or less as shown in (a) is reduced.

(Effect 4) Therefore, since the elastic force 11 due to the bending of the film F is reduced, even if the film F tends to loosen due to the poor adhesion to the circumferential surface of the spool shaft 1 and the film F tends to loosen, The state of is distorted,
It does not become elliptical and is concentric with the axis of the spool shaft 1. As a result, it is possible to suppress "load unevenness" when the film is pulled out, and as a result, it is possible to reduce the adverse effect on magnetic recording and the effect on frame position detection.

(Modification) In the first to fourth embodiments described above, the rigidity of the end portion of the film F in the longitudinal direction is changed. In the case where the film is broken, the film tip portion shown by the broken line including the film broken portion 5 as shown in FIG. 9 is cut off, and the same shape as shown by the solid line, for example, the same shape as before, or a desired shape not shown is further cut off. Mold and repair.

(Effect) If the damaged portion is repaired in this way, the shape of attachment to the spool shaft 1 can be reproduced or changed many times even in a portion that does not fall within the shooting frame range at the end of the film. .

(Fifth Embodiment) FIG. 10 and FIG. 11 illustrate a fifth embodiment of the present invention. FIG.
The film F7 shown in (1) shows the characteristic shape of the film end portion in this embodiment. That is, at the end portion of the film F7, the film end portion 6 of the first embodiment described above is formed to have a width W1, and the film hole portion, that is, the lightening portion 7 of the second embodiment described above is formed to have a width W2. Has been done. A set of locking holes 3 is provided near the leading edge of the film. The width of these parts is W1 <W
Must be 2.

FIG. 11 shows a state in which the film F7 having the above-described shape is started to be wound around the spool shaft 1. The thinly formed portion of the film end portion 6 is wound by about one turn, and the thickly bulged portion has exactly the same positional relationship with the rectangular lightening portion 7, and this thickness portion is the lightening portion 7.
You can see how it is buried inside the rectangular void.

(Operation 5) In addition to the operation of the first embodiment described above, when the film F7 is wound around the spool shaft 1, a slight "bulge" occurs at the fold position 2 due to the elastic force of the film. However, since the relationship of the dimensions of each part is W1 <W2,
Since the swollen portion 6 enters the lightening portion 7 on the circumference, the film on the subsequent second circumference is wound concentrically with respect to the axial center without being affected by the expansion due to the elastic force of the film. You can

(Effect 5) Therefore, the adhesion of the film F7 to the peripheral surface of the spool shaft 1 is deteriorated, and the film F7 is
Even if there is a tendency to loosen, this winding state is distorted,
It does not become elliptical and is concentric with the axial center of the spool shaft 1. This allows for "uneven load" when the film is pulled out.
Therefore, it is possible to suppress the adverse effect on the magnetic recording and the effect on the frame position detection.

(Sixth Embodiment) A sixth embodiment according to the present invention will be described with reference to FIGS. 1 and 12. The illustrated film F8 shows a characteristic shape of the film end portion as the present embodiment. That is, in the film F8 of FIG. 12, the tip crack portion 8 is formed to have a width W4, and the notch portion 9 is formed to have a width W3, and is formed in a constricted shape. A set of locking holes 3 is provided near the tip of the film.

(Operation 6) When the film F8 is wound around the spool shaft 1, the width W4 of the tip crack portion 8 is narrowed 9
Is slightly larger than the width W3 of the
The bulging portions of the two do not overlap each other on the first winding round. Therefore, the elastic force of the film F8 at the fold portion 2 is not affected, and the second round can be wound while suppressing the increase in thickness.

(Effect 6) Therefore, even when the film F has a poor adhesion to the peripheral surface of the spool shaft 1 and the film F tends to loosen, the film F does not become distorted or elliptical, Become concentric. This allows
"Uneven load" when pulling out the film can be suppressed,
It is possible to reduce adverse effects on magnetic recording and effects on frame position detection.

(Other Modifications) The film cartridge in the description of the embodiment is a 135 mm film cartridge,
It is also applicable to APS cartridges and the like.

Further, the shapes and dimensions relating to the "lightening portion" and the "notch portion" formed at the end portion of the film may be various other than those illustrated. Thus, the present invention
The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the gist of the present invention.

Although the description has been given based on a plurality of embodiments, the present invention includes the following inventions. [1] A first changing portion that changes from a straight portion to a curved portion or a second changing portion that changes curvature is provided on an outer peripheral portion, and a locking portion that locks a film is provided on the straight portion or the curved portion. One end is locked to the cartridge shaft and the locking portion of the cartridge shaft, and the rigidity before and after the change portion of the first or second change portion is smaller than the rigidity of the actual exposure portion at least on the first circumference. A film formed with a bent portion having a film patrone. (Operation and effect 1) Since the rigidity of the bent portion near the fold position is reduced, the elastic force when the film is sharply bent (90 ° or less) is reduced. Therefore, even if the film Patrone shaft has poor adhesion to the peripheral surface and the film tends to loosen, the winding state does not become distorted or elliptical, and it is concentric with the Patrone shaft axis. Therefore, it is possible to suppress the load unevenness when the film is pulled out, and thus it is possible to reduce adverse effects on magnetic recording, frame position detection, and the like.

[2] The bent portion of the film is characterized by having at least one of a portion formed by lightening or a notched portion having a width narrower than the film width [ [1] The film cartridge described in [1]. (Function and Effect 2) Since the narrow width portion of the film end and the lightened or cutout portion are set to the position and dimension width that exactly match each other, they do not overlap each other.
Therefore, since this thickness is wound in the lightening portion, the winding state does not become distorted or elliptical, and it is possible to suppress load unevenness when pulling out the film, and thus magnetic recording and frame position detection. It is possible to reduce adverse effects on the

[3] A film cartridge having a locking portion for locking the film on the cartridge shaft, and extending the locked film from the locking portion to the outer periphery of the cartridge shaft and winding the film by a predetermined amount. The film extends from the engaging portion and is located on the first lap in the vicinity of the outer periphery of the Patrone shaft, and on the second lap is located in the vicinity of the outer periphery of the Patrone shaft. And a film patrone characterized in that the first part and the second part are set so as not to overlap with each other. (Function and Effect 3) The first film portion (for example, a thin molding portion) at the end of the film is wound around one round, and this slightly thickened portion is the second film portion (for example, a rectangular lightening portion). ) Is exactly the same as the positional relationship with
This thickness is buried in the void of the lightening portion and does not overlap each other. Therefore, in addition to the action and effect 1, since the bulging portion at the first circumference with respect to the Patrone shaft enters the lightening portion, the film at the subsequent second lap is not affected by the bulging, and the film at the second circumference is relative to the axis. Can be wound concentrically. Therefore, the winding state does not become distorted or elliptical, and it is possible to suppress uneven load when the film is drawn out.
It is possible to reduce adverse effects on magnetic recording and effects on frame position detection.

In addition to the above, the following inventions are also included. (1) A film cartridge having a locking portion for locking a predetermined film on a spool shaft, the locked film extending from the locking portion to the outer peripheral portion of the spool shaft and wound by a predetermined amount, The film is a film of a portion to which a rigidity smaller than the rigidity of the exposed portion of the film is imparted over a range of a length corresponding to at least the outer periphery of the cartridge from the position where the film is locked to the locking part. A film patrone characterized by having.

(2) A film having a locking portion for locking a predetermined film on the spool shaft, and extending the locked film from the locking portion to the outer peripheral portion of the spool shaft and winding it by a predetermined amount. In the cartridge, a "thinning-out" thinned portion is arranged at a predetermined portion of the film which extends from the engaging portion and is initially located on the outer peripheral portion of the spool shaft.

(3) The predetermined portion is the end portion of the film, and the lightening portion is provided with at least a slit-shaped or hole-shaped "lightened" portion (2). The film patrone described in.

(4) It has a locking portion for locking a predetermined film on the spool shaft, and the locked film is extended from the locking portion to the outer peripheral portion of the spool shaft and wound by a predetermined amount. In the film patrone, the film is
A small width portion that is extended from the locking portion and is first located in the vicinity of the outer peripheral portion of the spool shaft and is notched to have a width smaller than the film width and is “constricted”, or is “thickened” into a predetermined shape. One of the shape features of the thinned portion is set, and at the second winding of the film, the other film portion that does not overlap the film portion located near the outer peripheral portion of the spool shaft is wound. A film patrone characterized in that the positional characteristics are set so as to rotate.

(5) A film cartridge having a locking portion for locking the film on the spool shaft, and extending the locked film from the inlet of the outer peripheral surface of the spool shaft and winding the film by a predetermined amount. In the film cartridge, a thin wall portion is formed in which a portion from the outer peripheral surface of a predetermined spool shaft to the engaging portion through the outer peripheral surface inlet portion is formed to have a thin wall thickness. .

(6) The film cartridge according to [1] or [3], wherein the film has a predetermined magnetic recording layer. (7) The film cartridge according to [1] or [3], wherein the film is a 135 mm film cartridge or a film for an APS (Advanced Photo System) cartridge.

(8) The photographic film has a predetermined photographic film and a spool shaft around which the photographic film is wound, and the photographic film has a predetermined crease when it is attached to the spool shaft at the end of the film. A film patrone characterized by being formed so as to relatively reduce bending rigidity as a film at a position and in the vicinity thereof as compared with other portions.

(9) A film cartridge containing the film according to (8), which has a magnetic recording layer at a predetermined position of the photographic film. (10) The film patrone according to (8), which has a portion where the film of the second winding is not overlapped and wound at a position which can be the fold of the first winding.

(11) In a photographic film formed by winding the film end portion on a spool shaft, the bent portion near the start of winding is narrower than the film width of the photographic frame. A film patrone having a photographic film to be used.

(12) In a photographic film formed by winding the end of a film on a spool shaft, the bent portion near the start of winding has at least one slit-shaped hole. A film patrone having a photographic film to be used.

(13) A photographic film formed by winding the film end portion on a spool shaft, wherein the bent portion near the start of winding has at least one hole. Film Patrone with.

(14) In the photographic film formed by winding the end portion of the film on the spool shaft and winding the film, the thickness of the film at the bent portion near the start of winding is made thinner than other portions. A film cartridge having a photographic film characterized by:

(15) In a photographic film formed by winding the end portion of the film on a spool shaft, the bent portion near the start of winding does not overlap the second winding of the wound film. A photographic film, characterized in that the film is perforated.

(16) In a photographic film formed by winding the end portion of the film on a spool shaft so as not to overlap the bent portion near the start of winding and the second winding of the wound film. , A film patrone having a photographic film, wherein the film is provided with a "notch portion".

(17) A predetermined film is locked to a locking portion provided on the cartridge shaft, and the film bulges outward due to the rigidity of the film itself at the portion where the curvature of the outer peripheral surface of the cartridge shaft changes. In a film patrone that extends another film from the engaging portion and winds it around the patrone shaft by a predetermined amount, and stores the film in a position that is likely to be a fold of the film from the outer peripheral surface of the patrone shaft to the engaging part. A film patrone characterized in that a bending portion is provided at a predetermined portion such that the rigidity of the film becomes relatively smaller than that of other portions.

(18) The bent portion of the film has at least one of a "thinned" portion and a "notched" portion having a width narrower than the width of the film. The film cartridge according to (17), which is characterized in that

(19) A locking film for locking a predetermined film on the cartridge shaft is provided, and the locked film is extended from the locking portion to the outer peripheral portion of the cartridge shaft and wound by a predetermined amount. In the film cartridge, the film is extended from the engaging portion and wound, and a first film portion located near an outer peripheral portion of the cartridge shaft on the first first rotation and a film cartridge on the second rotation. A second film portion located in the vicinity of the outer peripheral portion of the shaft, wherein the first film portion and the second film portion are set so as not to overlap each other. .

[0062]

As described above, according to the present invention, the position where the film end portion is likely to become a fold line when it is attached to the spool shaft and the bending rigidity of the film in the vicinity thereof are set by various exemplified shapes and thicknesses. Since the elastic force due to the bending around this position is reduced due to the decrease, even when the film adhesion is a little worse and the film loosens when the film is pulled out from the film cartridge, it is not It does not distort or loosen in an elliptical shape. Therefore, it is possible to maintain stability with little speed fluctuation during film feeding, and to suppress "uneven load" that has conventionally occurred during film drawing,
Provided is a film cartridge capable of reducing adverse effects on magnetic recording on a magnetic layer provided on a film surface during film feeding and adverse effects on detection of a frame position related to film feeding control. It becomes possible to do.

[Brief description of drawings]

1A and 1B show a film cartridge according to an embodiment of the present invention, in which FIG. 1A is a sectional view showing a sectional shape of one spool shaft, and FIG. 1B is a sectional view showing a sectional shape of another spool shaft.

FIG. 2 is a plan view showing the shape of a film end portion according to the first embodiment of the present invention.

FIG. 3 is a plan view showing a shape of a film end portion according to the first embodiment of the present invention.

FIG. 4 is a plan view showing the shape of a film end portion according to the second embodiment of the present invention.

FIG. 5 is a plan view showing the shape of a film end portion according to the third embodiment of the present invention.

FIG. 6 is a plan view showing the shape of a film end portion according to the third embodiment of the present invention.

FIG. 7 is a plan view showing the shape of a film end portion according to the fourth embodiment of the present invention.

8 is a cross-sectional view showing the thickness of the film along the line AA in FIG.

FIG. 9 is a plan view showing a broken shape of an edge portion of a film according to a fourth embodiment of the present invention with a broken line.

FIG. 10 is a plan view showing the shape of a film end portion according to the fifth embodiment of the present invention.

FIG. 11 is a perspective view showing a state in which a film end portion is wound around a spool shaft according to a fifth embodiment of the present invention.

FIG. 12 is a plan view showing the shape of a film end portion according to the sixth embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a state in which a film end portion is wound around a conventional spool shaft.

FIG. 14 is a graph showing the relationship between the “drawing speed” and the “drawing time” of a conventional film.

FIG. 15 is a cross-sectional view showing a state in which a film is wound around a conventional spool shaft and loosened.

FIG. 16 is a cross-sectional view showing a state in which a film is wound around a spool shaft and a loosened state is generated.

FIG. 17 is a cross-sectional view showing a state of looseness that occurs when a film is wound around a conventional spool shaft.

[Explanation of symbols]

 F, F1, F2, F3, F4, F5, F6, F7, F8 ... Film, 1 ... Spool shaft (Patrone shaft), 2 ... Winding start part (fold position), 3 ... Locking hole, 4 ... Projection part (Film locking means), 5 ... Damaged film portion, 6 ... Film end portion, 7 ... Film lightening portion (hole portion), 8 ... Film tip split portion, 9 ... Film notch portion (constricted portion), 10 ... Flange, 11 ... Elastic force (folding reaction force), 12 ... Thin film portion, 20 ... Drawing direction, 21 ... Friction force direction, 22 ... Rotation direction.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Kume 2-34-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A locking portion for locking a film on a straight line portion or a curved portion, having a first change portion for changing from a straight portion to a curved portion or a second change portion for changing a curvature on an outer peripheral portion. One end is locked to the provided cartridge shaft and the locking portion of the cartridge shaft, and the front and rear of the changed portion of the first or second changed portion is more than the rigidity of the actual exposure portion at least on the first circumference. A film formed with a bent portion having a small rigidity, and a film cartridge. 2. The bent portion of the film has at least one of a portion formed by lightening or a notched portion having a width narrower than the film width. Item 1. The film cartridge according to item 1. 3. A film cartridge having a locking portion for locking a film on a cartridge shaft, wherein the locked film is extended from the locking portion to an outer peripheral portion of the cartridge shaft and wound by a predetermined amount, The film has a first portion extending from the engaging portion and located near the outer peripheral portion of the Patrone shaft on the first round, and a second portion located near the outer peripheral portion of the Patrone shaft on the second round. And a film patrone characterized by being set so that the first portion and the second portion do not overlap.