JP2000075443A - Cartridge for film, film loosening preventing member, film presser member and film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge for film housing film which does not require a piece of tape to prevent the conventional photosensitive film wound in a roll state from loosening. SOLUTION: This cartridge for film C housing the photosensitive roll film having trailer for shielding light formed at its rear end is equipped with a take-up shaft 2 having a core to which the film is taken up and an engaging part engaged with the film take-up shaft of the camera, and a film loosening preventing member 3 freely rotating in a circumferential direction with respect to the center of the core and preventing the film loosening by providing an inner wall whose inside diameter is nearly equal to the outer peripheral diameter of the film obtained when the film is all tightly wound round the core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a film cartridge, a film unraveling prevention member, a film holding member, and a film unit with a lens.

[0002]

2. Description of the Related Art An ordinary camera uses a J135 film.
It is desirable to use a brownie film having a larger screen size than the film. However, compared to cameras using J135 film, the penetration rate of cameras using brownie film is much lower.

One of the reasons is the difficulty in handling brownie films. A typical brownie film is a film referred to as J120 in JIS, and the entire base surface side of the brownie film is closely attached to a light-shielding backing paper and wound around a winding shaft.

FIG. 1 is a diagram showing a conventional brownie film loaded in a camera. At the time of film loading, the brownie film wound around the first winding shaft S1 together with the light-shielding backing paper is placed in the unexposed film chamber 51b of the unit body 51.
After that, the tape (not shown) that prevents the film from being unraveled is peeled off, and the second film of the same shape as the first winding shaft S1 is placed in the exposed film chamber 51c.
And the leading end Ba of the light-shielding backing paper is inserted into the slit S2a on the side surface of the second winding shaft S2 as a leader paper, and the second winding shaft S2 is rotated to remove the brownie film. Winding is performed from the first winding shaft S1 to the second winding shaft S2. During this time, the film F wound around the winding shaft S2 of the exposed film chamber 51c is held by the film holding member 52 while being held by the winding shaft S2.
2 tightly wound. After the photographing is completed, the brownie film is taken out of the camera with the brownie film wound on the second winding shaft S2, and the outer periphery of the roll-shaped film is fixed by a tape (not shown). Then, in the next photographing, the first winding shaft S1 remaining as a single item is replaced with the second winding shaft S2.
Is loaded into the exposed film chamber 51c. In the film development, the tape is peeled off, and then the film is developed.

There is also a film called J220, which is the same as J120 except that it has a leader paper at the leading end and a trailer paper at the trailing end, and the film is wound bare. It is.

[0006]

As described above, the brownie film is only wound around the take-up shaft together with the light-shielding backing paper, so that it can be handled when loading the film into the camera or taking out the film from the camera. If care is not taken, fogging will occur in the film. In addition, it is necessary to peel off the tape from the unexposed brownie film or to stick the tape on the exposed brownie film, which makes the handling complicated.

[0007] This complexity of handling is a major factor in the widespread use of brownie films. In recent years, a film unit with a lens has been widely used, and there is a demand for obtaining a higher quality photograph in the film unit with a lens. In order to meet this demand, it has been proposed to incorporate a brownie film into a film unit with a lens. However, as described above, handling is complicated, and there is a risk that light fogging may occur in a film, particularly at a film developing station. Therefore, this measure is strongly desired.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a film cartridge which does not require a tape for preventing a conventional brownie film from being unraveled. Another object of the present invention is to provide a film unit with a lens to which the film cartridge is applied. It is another object of the present invention to provide a film unraveling prevention member which engages with a winding shaft which does not require a conventional tape for preventing unwinding of a brownie film. Another object of the present invention is to provide a film holding member that engages with a take-up shaft that does not require a member that holds a conventional camera-side film base. Another object of the present invention is to provide a lens-fitted film unit to which a film unraveling prevention member or a film holding member that engages with the winding shaft is applied.

[0009]

The above object can be achieved by any of the following means.

(1) A film cartridge for accommodating a photosensitive roll-shaped film having a light-shielding trailer formed at a rear end portion thereof, wherein a film winding core is wound on a film winding shaft of a camera. A winding shaft having an engaging portion that is rotatable in the circumferential direction with respect to the center of the winding core, and is substantially equal to a film outer diameter when the film is tightly wound around the winding core. A film cartridge comprising: a film unraveling member having an inner wall with an inner diameter to prevent the film from being unraveled.

(2) The take-up shaft has a slit through which a film insertion portion is visible when a film cartridge is loaded in an exposed film chamber of a camera and a leader at a leading end of the film is inserted. The film cartridge according to (1), further comprising:

(3) A film holding member is provided which presses the film wound around the winding core of the winding shaft from the base surface side of the film against the winding core (1) or (1). The film cartridge according to (2).

(4) A regulating member for regulating the direction in which the slit is inserted into the film relative to the position of the film cartridge loaded in the exposed film chamber of the camera (1), (2) or (2). The film cartridge according to 3).

(5) An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing an unexposed film by a photographic lens to form a photographic image. In a film unit with a lens that incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage and feeds the exposed film to the exposed film chamber for each photographing, the exposed film A film unit with a lens, wherein at least the film cartridge according to any one of (1) to (4) is loaded in the chamber.

(6) With respect to a winding shaft having a winding core for winding a photosensitive roll-shaped film formed at the rear end of a light-shielding trailer and an engaging portion for engaging with a film winding shaft of a camera. It has an inner wall having an inner diameter substantially equal to the outer diameter of the film when the film is tightly wound around the winding core to prevent loosening of the film. A film unraveling member characterized by the above-mentioned.

(7) With respect to a winding shaft having a winding core for winding a photosensitive roll-shaped film formed at a rear end portion of a light-shielding trailer and an engaging portion for engaging with a film winding shaft of a camera. The film, which is detachable and rotatable in the circumferential direction, presses the film wound around the winding core of the winding shaft against the winding core from the base surface side of the film. Film holding member.

(8) An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing an unexposed film by a photographic lens to form a photographic image. In a film unit with a lens that incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage and feeds the exposed film to the exposed film chamber for each photographing, the exposed film A film unit with a lens, wherein at least a take-up shaft engaged with the film unraveling member according to (6) is loaded in the chamber.

(9) An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing an unexposed film by a photographic lens to form a photographic image. In a film unit with a lens that incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage and feeds the exposed film to the exposed film chamber for each photographing, the exposed film A film unit with a lens, wherein at least a take-up shaft engaged with the film holding member according to (7) is loaded in the chamber.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A film cartridge, a film unraveling member, a film holding member, and a film unit with a lens according to an embodiment will be described with reference to the drawings.

(First Embodiment) FIG. 2 is a perspective view of a film cartridge, FIG. 3 is a front view (a), a top view (b) and a sectional view (c) of the film cartridge, and FIG. FIG. 5 is a perspective view of the film unit with the lens with the back cover and the film removed, as viewed from the rear.

First, the film cartridge will be described. As shown in FIGS. 2, 3, and 4, the film cartridge C includes a winding shaft 2, a film unraveling member 3, and the like. The winding shaft 2 includes a winding core 2f, a flange 2a, a slit 2b, a locking claw 2e, a shaft 2c, and an engaging portion 2d. First, the winding core 2f is a core for winding the film. The flanges 2a are members provided at both ends in the axial direction for preventing light fogging of the film.
The slit 2b is an insertion portion of the film F, and the film F
Can be inserted. The locking claw 2e is provided in the slit 2b to lock the hole Fb provided in the front end Fa of the film F. The shaft portion 2c is a shaft that rotates with respect to the film unraveling prevention member 3. Further, the engaging portion 2d is a concave portion provided in the axial direction of the winding shaft 2 and engaging with the film winding shaft of the camera.

Next, the film unraveling member 3 has a film unraveling preventing portion 3a and a bearing portion 3c. In the embodiment, the film unraveling member 3 is integrally formed with the outside 3e of the film cartridge C and the film pressing member 3b. Note that they may be separate.

The film unraveling prevention portion 3a has an inner wall having an inner diameter substantially equal to the outer diameter of the outer periphery of the film F when the film F is tightly wound around the winding core 2f. For example, the film cartridge C is removed from the camera. As a result, the film F is prevented from being loosened from the densely wound state to the bull wound state. The bearing 3c engages with the shaft 2c to rotatably support the winding shaft. The film pressing members 3b are provided at two places, and press the film F from the base surface side of the film F in the direction of the winding core 2f of the winding shaft 2. As a result, the film F is wound in close contact with the winding core 2f.

The regulating member for regulating the direction in which the slit is inserted into the film will be described.
3d enters a groove (not shown) formed in a part of the winding core 2f at the time of manufacturing to regulate the direction of the slit with respect to the position of the film cartridge C loaded in the camera, and after the film F is engaged. Then, the film F covers the groove and the regulation is released. This makes it easier for the leading end of the film F to enter the slit 2b. The outside 3e has an opening at a portion where the feed path of the film F and the slit 2b are viewed. Further, the outer portion 3e is formed integrally with the two outer portions and is bent at a bent portion 3f substantially at the center, and the winding shaft 2 is housed and fixed inside. Therefore, the film F can be engaged while watching the slit 2b.

Next, the trailer Ft at the rear end of the film F (see FIG. 4) has a light-shielding property.
When all are wound, the film F is shielded from light. The hole Fb at the tip Fa of the leader Fr is provided with a locking claw 2e.
To lock. The film F may be a type having a light-shielding leader and a trailer wound with light-shielding backing paper like a J120 film, and the film F has a light-shielding leader paper called J220, Further, the film F may have a light-shielding trailer paper and the film F may be wound in a bare state. Thus, the film F is shielded from light even when an unexposed film is contained in the film cartridge C.

Next, a film unit with lens to which the film cartridge is applied will be described with reference to FIG. The unit main body 11 is equipped with various photographing mechanisms, and is light-tightly covered with the front cover 12 and the back cover 13.
The subject light that has passed through the photographic lens, shutter, and aperture (not shown) is focused on the screen frame 11a of the unit main body 11, and exposes the film F located on the screen frame 11a.
The film roll R stores an unexposed brownie film and is loaded in the unexposed film chamber 11b of the unit body 11. Note that the film roll R refers to a film in which the film F is wound around a winding shaft S1. The film cartridge C is a film cartridge in which the film F is not stored, and is loaded in the exposed film chamber 11c. Then, the leader Fr of the film F is inserted and engaged with the slit 2b whose position is regulated.

In this way, the film roll R and the film cartridge C are loaded, then the back cover 13 is loaded to keep the film F lighttight, and then the winding shaft 2 is placed by an external operation. When the film is wound after being rotated by a predetermined amount, the film F is tightly wound by the film pressing member 3b. The photographer presses the release button 15 in a state where the first film frame appears so as to take a picture. Note that 16
Is a finder.

Thereafter, after all frames on the film are exposed and photographing is completed, when the winding shaft 2 is further rotated, the trailer Ft of the film F (see FIG. 4) is separated from the film roll R, and Ft is wound around the winding shaft 2.

Thereafter, the film cartridge C is taken out of the film unit with the lens. At this time, the engagement of the film unit with the lens with the winding shaft is disengaged, and the outer diameter of the film is about to be increased as the film F is unraveled. When developing the film F, the trailer F of the film F which can be seen from the outside 3e of the film cartridge C
t (see FIG. 4), pull out the film F
Take out. When the film F is pulled with a predetermined force or more, the hole Fb of the film F comes off from the locking claw 2e. Note that the film F
Light fogging can be more reliably prevented.

As described above, the operation of peeling off the tape for preventing the film from being unraveled and the operation of attaching the tape as in the prior art become unnecessary, and the handling becomes simple.

(Second Embodiment) Next, another film cartridge will be described. FIG. 6 is a perspective view of another film cartridge. 3 and 4 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 6, the film cartridge C comprises a winding shaft 2, a film unraveling member 4, and the like. The winding shaft 2 is the same as that of FIG. 3 described above. Explaining the different parts, a shaft portion 2c is provided on the outer periphery of the flange 2a and is engaged with the bearing portion 4c.

Next, the film unraveling member 4 has a film unraveling preventing portion 4a and a bearing portion 4c. In the embodiment, the film unraveling member 4 is integrally formed with the film pressing member 4b. The inner wall of the film unraveling prevention portion 4a is substantially the same as the outer diameter of the film F when all the films F are closely wound, and prevents the film from being loosened. The bearing portion 4c has an English letter C shape and engages with the shaft portion 2c. The film holding member 4b has upper and lower arms on the left and right sides of the film unraveling prevention portion 4a, and presses the film F wound around the winding core 2f in the direction of the winding core 2f from the base surface side to tightly wind the film F. . The film unraveling prevention member 4 is attached by pressing the flange 4a from the open portion of the bearing portion 4c to elastically deform the bearing portion 4c. When loading the film cartridge C into the exposed film chamber (see FIG. 5), the film cartridge C is set in the exposed film chamber so that the leading end of the film can be easily inserted into the slit 2b.

As described above, the operation of peeling off the tape for preventing the film from unraveling and sticking the tape on the exposed film as in the prior art becomes unnecessary, and the handling becomes simple.

(Third Embodiment) Another film cartridge will be described. FIG. 7 is a perspective view of another film cartridge. 3 and 4 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 7, the film cartridge C comprises a winding shaft 2, a film unraveling member 5, and the like. The take-up shaft 2 is the same as that of FIG. 3 described above. Explaining the different parts, the shaft portions 2c at both ends in the axial direction of the take-up shaft 2 are engaged with the bearing portions 5c.

The film unraveling prevention portion 5a of the film unraveling member 5 has an inner wall having an inner diameter substantially equal to the outer diameter of the film F when all the films F are closely wound around the winding shaft 2, and the film F is unraveled. To prevent The film holding member 5b has upper and lower arms on the left and right sides of the film unraveling prevention portion 5a, and presses the film F wound around the winding shaft 2 in the direction of the winding shaft 2 from the base surface side to tightly close the film F. Let it roll. The attachment of the film unraveling member 4 to the take-up shaft 2 is performed by expanding the bearing portions 5c at both ends in the axial direction and fitting the film into the shaft portion 2c. When loading the film cartridge C into the exposed film chamber, the film is set in the exposed film chamber such that the leading end of the film is easily inserted into the slit 2b.

In the second and third embodiments, the film cartridge C has the film holding member provided on the film cartridge C side. However, the film holding member is provided on the camera side, and the film holding member is provided on the film cartridge side. The pressing may be omitted.

In the second and third embodiments, the example in which the film cartridge C of the present invention is loaded in the exposed film chamber of the film unit with a lens has been described. May be. Also,
The present invention is not limited to the film unit with a lens, and may be applied to a camera other than the film unit with a lens.

(Fourth Embodiment) Next, a film unraveling member and a film take-up member will be described with reference to FIG.
This will be described with reference to FIG. 3 and 4 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 6, the film unraveling member 4 enters the winding shaft 2 so as to be detachable. The winding shaft 2 has a winding core 2f for winding a photosensitive roll-shaped film formed at the rear end of a light-shielding trailer, and an engaging portion 2d for engaging with a film winding shaft of a camera. The winding shaft 2 may be a winding shaft called a spool used for a JIS J120 roll film, for example. The film unraveling member 4 is detachable with respect to the winding shaft 2 and is rotatable in the circumferential direction. The inner wall having an inner diameter substantially equal to the outer diameter of the film when the film is completely wound around the winding core 2f. The film has an unraveling prevention portion 4a.

Next, the film pressing member 4b is
The film pressing member 4b is a member that presses the film to be wound around f from the base surface side of the film in the direction of the winding core 2f. In this embodiment, the film pressing member 4b has an integral structure with the film unraveling member. It may be possible to freely engage and disengage with the winding shaft 2 and rotate in the circumferential direction.

(Fifth Embodiment) Next, a film unit with a lens having a film unraveling prevention member and a winding shaft engaged with the film winding member will be described with reference to FIG. In FIG. 5, a description will be given by replacing the illustrated film cartridge C with a winding shaft engaged with the film unraveling prevention member and the film winding member illustrated in FIG. The same parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The unit main body 11 is equipped with various photographing mechanisms, and is light-tightly covered with the front cover 12 and the back cover 13. The subject light that has passed through the photographic lens, shutter, and aperture (not shown) is focused on the screen frame 11a of the unit main body 11, and exposes the film F located on the screen frame 11a. The film roll R stores an unexposed brownie film, and the unexposed film chamber 11 of the unit body 11
b. Further, the winding shaft 2 in which the film unraveling member 4 and the film pressing member 4b are engaged is loaded in the exposed film chamber 11c. Then, the leader Fr of the film F is inserted into and engaged with the slit 2b. The take-up shaft 2 in which the film roll R, the film unraveling prevention member 4 and the film pressing member 4b are engaged is loaded.

Thereafter, the back cover 13 is loaded to keep the film light-tight, and then the winding shaft 2 is rotated by a predetermined amount by an external operation to wind the film, and the film F is held by the film pressing member 4b. Closely wound. Release button 15 so that the first film piece appears
Press to shoot.

Thereafter, after the exposure is performed on all the frames on the film and the photographing is completed, when the winding shaft 2 is further rotated, the trailer Ft of the film F (see FIG. 4) is separated from the film roll R, and the trailer Ft Is winding shaft 2
Wrapped around.

Thereafter, the film F wound around the winding shaft 2 is taken out from the film unit with a lens. When developing the film F, the film F wound around the winding shaft 2
Of the trailer Ft (see FIG. 4) and pull out the film F.

[0048]

According to the above configuration, the following effects can be obtained. According to the film cartridge of the first aspect, since the film unraveling member is provided, a tape for preventing the film from being unraveled becomes unnecessary as in the related art, and the handling of the film is simplified.

According to the film cartridge of the present invention, since the slit into which the leading end of the film is inserted can be visually checked, the leading end of the film can be easily inserted into the slit.

According to the third aspect of the present invention, since the film holding member is provided on the film cartridge side, the film holding portion on the camera side becomes unnecessary.

According to the film cartridge of the fourth aspect, since the direction of the slit of the winding shaft is regulated to a predetermined direction, it becomes easy to insert the leading end of the film leader into the slit.

According to the film unit with the lens according to the fifth aspect, since the film cartridge has the film unraveling member, the conventional tape for preventing the film from being unraveled becomes unnecessary, and the film can be easily handled. Becomes

According to the film unraveling prevention member of the sixth aspect, the film can be freely disengaged and rotated with respect to the winding shaft, and has an inner wall having an inner diameter substantially equal to the outer peripheral diameter of the film. Unlike the conventional case, a tape for preventing the film from being unraveled becomes unnecessary, and the handling of the film becomes simple.

According to the film pressing member of the present invention, the film to be wound on the winding core is detachable and rotatable with respect to the winding shaft. Since the pressing is performed from the surface side, the pressing portion of the film on the camera side becomes unnecessary.

According to the film unit with the lens according to the eighth aspect, since the winding shaft in which at least the film unraveling prevention member is engaged is loaded in the exposed film chamber, the film can be prevented from being unraveled as in the prior art. No tape is required, and the handling of the film is facilitated.

According to the film unit with the lens according to the ninth aspect, since the take-up shaft in which at least the film pressing member is engaged is loaded in the exposed film chamber, the film pressing member is not required on the camera side.

[Brief description of the drawings]

FIG. 1 is a view showing a conventional brownie film loaded in a camera.

FIG. 2 is a perspective view of a film cartridge.

FIG. 3 is a front view (a), a top view (b), and a cross-sectional view (c) of a film cartridge.

FIG. 4 is an explanatory diagram of a configuration of a film.

FIG. 5 is a perspective view of the lens-fitted film unit with the back cover and the film removed, as viewed from the rear.

FIG. 6 is a perspective view of another film cartridge.

FIG. 7 is a perspective view of another film cartridge.

[Explanation of symbols]

 2 Take-up shaft 2a Flange 2b Slit 2c Shaft 2d Engagement part 2e Locking claw 2f Core 3,4,5 Film unraveling member 3a, 4a, 5a Film unraveling member 3b, 4b, 5b Film pressing member 3c, 4c, 5c Bearing 3d Tip 3e External 11 Unit body 11c Exposed film chamber C Film cartridge F Film Fr Reader Ft Trailer R Film roll Fa Tip

Claims (9)

[Claims] 1. A film cartridge for accommodating a photosensitive roll-shaped film having a light-shielding trailer formed at a rear end thereof, wherein the film cartridge is engaged with a winding core for winding the film and a film winding shaft of a camera. A winding shaft having an engaging portion, and an inner diameter which is rotatable in a circumferential direction with respect to a center of the core, and which is substantially equal to a film outer diameter when the film is completely wound around the core. A film unraveling member having an inner wall for preventing film unraveling. 2. A winding shaft, wherein a film insertion portion is visible when a film cartridge is loaded in an exposed film chamber of a camera, and a slit for inserting a leader at a leading end of the film is provided. 2. The film cartridge according to claim 1, wherein: 3. A film holding member for pressing the film wound around a winding core of the winding shaft against a base surface of the film against the winding core. 4. The film cartridge according to claim 1. 4. The apparatus according to claim 1, further comprising a regulating member for regulating a direction in which the slit is inserted into the film relative to a position of the film cartridge loaded in the exposed film chamber of the camera. Film cartridge. 5. An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing the unexposed film by a photographic lens to form a photographic image. In the film unit with a lens which is disposed and incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage, and feeds the exposed film to the exposed film chamber for each photographing, the exposed film chamber A film unit with a lens, wherein at least the film cartridge according to any one of claims 1 to 4 is loaded in the film unit. 6. A winding shaft having a light-shielding trailer having a winding core formed at a rear end portion for winding a photosensitive roll-shaped film and an engaging portion engaging with a film winding shaft of a camera. The film is detachable and rotatable in the circumferential direction, and has an inner wall having an inner diameter substantially equal to the outer peripheral diameter of the film when the film is tightly wound around the core, thereby preventing the film from being unraveled. A film unraveling member characterized by the following. 7. A light-shielding trailer is engaged with a winding shaft having a winding core formed at a rear end portion for winding a photosensitive roll-shaped film and an engaging portion engaging with a film winding shaft of a camera. A film which is detachable and is rotatable in the circumferential direction, and presses the film wound around the winding core of the winding shaft against the winding core from the base surface side of the film. Holding member. 8. An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing an unexposed film by a photographic lens to form a photographic image. In the film unit with a lens which is disposed and incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage, and feeds the exposed film to the exposed film chamber for each photographing, the exposed film chamber A film unit with a lens, further comprising a take-up shaft engaged with the film unraveling member according to claim 6. 9. An unexposed film chamber for loading an unexposed film and an exposed film chamber for loading an exposed film are provided at both ends of a screen frame for exposing an unexposed film by a photographic lens to form a photographic image. In the film unit with a lens which is disposed and incorporates an unexposed film wound in a roll shape in advance in a manufacturing stage, and feeds the exposed film to the exposed film chamber for each photographing, the exposed film chamber A film unit with a lens, wherein at least a winding shaft engaged with the film holding member according to claim 7 is loaded.