JP2000352745A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the position of photographic film in a lighttight cartridge by Making a driving force transmitting part elastically press a film spool in the shaft direction of the film spool. SOLUTION: The film spool fitting shaft 2441 of a driving gear plate 244 constituting a cartridge cover 24 is fit in another spool driving shaft hole 523b of the film cartridge 50. A driving shaft 247 is inserted inside the shaft 2441, and is pushed up by a coil spring 245. Thus, the flange parts 2472 and 2473 of the shaft 247 push up a spool driving shaft 525b forming the hole 523b. Then, the film spool 52 is biased in its shaft direction, so that the position in the shaft direction of the spool 52 is made stable. Therefore, the traveling of the photographic film 53 wound round the spool 52 is made stable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera to which a light-tight film cartridge containing a rolled photographic film is loaded.

[0002]

2. Description of the Related Art Many products have been commercialized as cameras constituting a photographic system generally called an advanced photo system (APS). In these cameras, a light-tight cartridge dedicated to APS is used. When using the light-tight cartridge, the cartridge cover generally arranged at the bottom of the camera is opened and the light-tight cartridge is inserted into the cartridge loading chamber. An operation of loading in the axial direction and closing the cartridge lid after the loading is performed.

[0003]

Some of such APS-compatible cameras do not have any particular means for stabilizing the position of the light-tight cartridge loaded in the cartridge loading chamber. In the case of such a camera, it is necessary to ensure that the detection of the film information in the cartridge and the driving of the film withdrawal and delivery performed after the light-tight cartridge is loaded into the cartridge loading chamber are performed stably. Will be difficult.

In some cameras compatible with such APS, as a means for stabilizing the position of a light-tight cartridge loaded in a cartridge loading chamber, the entire cartridge is pressed in one direction by a spring bias. Cameras with means are known.

However, the photographic film loaded in the light-tight cartridge is not completely fixed in the light-tight cartridge and there is play, so that the light-tight cartridge loaded in the cartridge loading chamber cannot be used. Even if the spring is biased in one direction, the backlash of the film cannot be eliminated, and there is still a problem in the running stability of the film.

In view of the above circumstances, it is an object of the present invention to provide a camera in which the position of a photographic film in a light-tight cartridge is stabilized.

[0007]

According to the present invention, there is provided a camera having a cartridge loading chamber for loading a film cartridge containing a rolled photographic film wound around a film spool. In a camera in which a photographic film is sent from a film cartridge loaded in a chamber and a photograph is taken on the photographic film and the photographed photographic film is accommodated in the film cartridge, a film is mounted on a film spool of the film cartridge loaded in the cartridge loading chamber. A drive force transmitting unit is provided in the axial direction of the spool and rotates the film spool by transmitting drive force to the film spool, and the drive force transmitting unit elastically moves the film spool in the axial direction of the film spool. To press It is characterized in.

The photographic film in the film cartridge is housed in a state wound around a film spool.
Therefore, in order to stabilize the position of the photographic film and stabilize the running property, it is necessary to position the photographic film in the cartridge loading chamber, not the film cartridge itself, but the photographic film housed in the film cartridge. Film spool. Here, to a camera of the type in which such a film cartridge is loaded, a driving force for feeding photographic film contained in the film cartridge loaded in the cartridge loading chamber is transmitted to the film spool of the film cartridge. There is a driving force transmission unit that performs

The present invention has been completed by focusing on these points. That is, in the present invention, a driving force transmitting portion for transmitting a driving force for feeding a photographic film to a film spool is provided with a means for elastically pressing the film spool in its axial direction. Is pressed in the axial direction, the position of the photographic film wound on the film spool is stabilized, and film running and the like can be stably performed.

In the camera according to the present invention, a cartridge cover for opening and closing the cartridge loading chamber is provided.
It is preferable that the driving force transmitting section is provided on a cartridge lid.

The driving force transmitting portion for transmitting the driving force to the film spool is usually formed of a spur gear or the like, and is small and thin. Therefore, the driving force transmitting portion is often provided on a cartridge cover for covering the cartridge loading chamber.

The camera according to the present invention utilizes the driving force transmitting portion to elastically press the film spool in the axial direction, and does not require a special mechanism apart from the driving force transmitting portion, and is compact. It is possible to elastically press the thin driving force transmitting portion as it is, and to provide the same in the cartridge lid as in the conventional case.

Further, in the camera of the present invention, the driving force transmitting portion receives the driving force and rotates around the axis of the film spool, and the gear member is disposed coaxially with the rotation axis of the gear member. An engagement member that engages with both the gear member and the film spool and rotates with the rotation of the gear member to rotate the film spool, and a spring member that biases the engagement member toward the film spool, It is preferable to adopt a configuration in which the film spool is elastically pressed by the engagement member being urged by the spring member.

In this case, the position of the engaging member is moved by the play of the film spool by the spring member, but the position of the gear member is maintained unchanged without being changed by the bias of the spring member. Stable driving can be performed. .

Further, in the camera according to the present invention, the driving force transmitting portion includes an engaging portion that engages with the film spool, and a gear portion that receives the driving force and rotates around the axis of the film spool. A driving force transmitting member, a spring member for urging the driving force transmitting member toward the film spool, and a spring member for urging the driving force transmitting member toward the film spool, wherein the driving force transmitting member is biased by the spring member By doing so, the film spool may be elastically pressed.

In this case, since the driving force transmitting member including the gear portion corresponding to the gear member in the above configuration is urged by the spring member, the position of the gear portion also moves by the play of the film spool. If this position fluctuation is extremely large, it is conceivable that the transmission of the driving force will be supported.However, the backlash of the film spool is normally held down to a certain extent, and even if the gear position moves by that backlash, the support will The gear portion can be configured to the extent that it does not exist. on the other hand,
According to this embodiment, since the driving force transmitting member including the gear member and the engaging member in the above-described embodiment is provided, the number of components is reduced, and the cost is advantageous.

[0017]

Embodiments of the present invention will be described below.

FIG. 1 is an external perspective view of a camera according to an embodiment of the present invention as viewed obliquely from the front.

At the center of the front of the camera 10, there is provided a lens barrel 12 in which a photographing lens 11 is held. At the top of the front of the camera 10, a finder objective window 13 and an active auto focus ( A for AF)
An F light emitting window 14, an AF light receiving window 15, and an AE light receiving window 16 for measuring the brightness of the object scene are arranged. A shutter button 17 is arranged on the upper surface of the camera 10.

FIG. 2 is an external perspective view of the camera of FIG. 1 as viewed from the direction in which the rear and bottom surfaces appear.

A finder eyepiece window 21 is provided on the rear surface of the camera 10, and a film cartridge loading chamber 23 for loading an APS film cartridge 50 conforming to the APS photo system is provided on the bottom surface of the camera 10. A cartridge lid 24 for closing the entrance portion of the cartridge, and a cartridge lid opening / closing lock lever 25 for opening the cartridge lid 24 are provided.

The photo film cartridge 50 has a built-in photo film wound around a spool, and its film entrance and exit are covered with a light-tight structure opening / closing lid (not shown). Is not opened or closed. Further, a bar code (not shown) is provided outside the flange surface of the spool of the film cartridge 50 on the side facing the camera loading chamber, and the bar code is provided through a window provided on the end surface of the film cartridge 50. Is visible.

The cartridge lid 24 is opened by rotating the cartridge lid opening / closing lock lever 25 at the bottom of the camera 10 in the opening direction, and the APS film cartridge 50 is inserted into the film cartridge loading chamber 23 in the axial direction as shown by the arrow in the figure. Load it.

Next, when the cartridge lid 24 is closed, the opening / closing lid that keeps the film entrance and exit of the film cartridge 50 light-tight is opened in conjunction with this closing operation, and the operation of the camera is subsequently started. Here, the photographic film inside the film cartridge is first driven to rotate in the direction opposite to the direction in which the film is sent out, and the loaded A
It is determined whether the photo film in the PS film cartridge is unused or used, and at the same time, the sensitivity of the photo film is detected.

When it is detected that the photo film in the loaded film cartridge is not used, the driving direction of the photo film is reversed, the photo film is rotated in the sending direction, and the first frame is moved. When the film is fed to the photographing position, the film feeding stops and the preparation for photographing is completed.

Thereafter, each time the photographing of one frame is completed, the photographic film is fed out by one frame, and this is repeated, and when the photographing of the last frame is completed, the photographic film is rewound into the film cartridge.

FIG. 3 is a longitudinal sectional view of a film cartridge.
FIG. 4 is a diagram showing a cross section of a part of the film cartridge in a lateral direction.

In the film cartridge 50, a film spool 52 is disposed in a cartridge body 51,
A roll-shaped photographic film 5 is mounted on the film spool 52.
3 is wound and accommodated in the cartridge body 51. The film spool 52 has a cylindrical portion 521 around which a photographic film is wound, flanges 522a and 522b for regulating both ends of the film, and a spool driving hole into which a camera-side member for driving the film spool 52 is inserted. 523a, 523b and spool drive shafts 525a, 525b forming key grooves 524a, 524b for locking the members on the camera side. The film spool 52 is provided with a display plate 526 for displaying barcode information in a notch (not shown) formed on the upper end surface of the cartridge main body 51. A display plate 532 having a display function for indicating the use state of the film is fixed.
The display plate 532 is provided with a plurality of perforated windows (not shown) provided on the lower end surface of the cartridge body 51 in accordance with the stop position of the display plate 532 at the end of the film rewinding.
Information such as whether the film is unused, used, or in use is displayed.

Here, the spool drive shafts 525a, 525
The reason why b is formed at both ends of the film spool 52 is that, for example, one of the two spool drive holes 523a and 523b is provided on the camera side in accordance with the structure of the camera in which the film cartridge 50 is loaded. In order to secure the degree of freedom of design.

In the cartridge body 51 of the film cartridge 50, the photographic film housed therein is pulled out of the film cartridge 50, or the photographic film after photographing is stored in the film cartridge 50.
Has a film entrance 511 for accommodating the
The film door 511 is provided with an opening / closing lid 54 for keeping the inside of the film cartridge body 51 light-tight. The opening / closing lid 54 is fixed to opening / closing shafts 541a and 541b for opening and closing the opening / closing lid 54,
The opening / closing shafts 541a and 541b are provided with engaging holes 542a, on the camera side, into which members for opening and closing the opening / closing lid 54 are inserted.
The opening and closing shafts 541a and 541b are locked by the members
Keyways 543a, 543 for transmitting drive force for opening and closing the lid
b. The members on the camera side are the engagement holes 542a, 5
42b, the opening / closing shafts 541a and 541b rotate accordingly, and the opening / closing lid 5
4 opens or closes the film entrance 511.
Here, two open / close shafts 541a and 541b are provided with the open / close cover 54 sandwiching the open / close cover 54, as in the case of the spool drive shafts 525a and 525b. This is because the opening and closing cover 54 may be opened and closed by rotating any of the opening and closing shafts 541a and 541b.

FIG. 5 is an exploded perspective view showing the structure of the cartridge lid 24 of the camera 10 shown in FIG. 2, and FIG.
FIG. 10 is a cross-sectional view of a state where the film cartridge 50 is loaded in the cartridge loading chamber 13 and the cartridge lid 24 is closed.

The main body 241 of the cartridge lid 24
Is rotatably attached to the camera bottom via a hinge shaft 242. The main body 241 includes a holding plate 24.
3 has a recess 2411 in which it is just inserted, and a support wall 241 for supporting the holding plate 243 is provided in the recess 2411.
2. A fitting shaft 2413 to which the drive gear plate 244 fits, a fitting pin 2414 which stands on the fitting shaft and is inserted into the coil spring 245, and a fitting shaft 241 to which the idler gear 246 fits.
5. A holding plate 243 erected on the fitting shaft 2415
Is formed with a positioning pin 2416 to be inserted into a positioning hole 2431 provided in the base.

The idler gear 246 is fitted to the fitting shaft 2415 as described above. The coil spring 245 is fitted into the fitting pin 2414, the drive shaft 247 is inserted into the drive gear plate 244, and the drive gear 244 in which the drive shaft 247 is fitted is fitted into another fitting shaft 2414. The drive gear plate 244 and the idler gear 246 respectively fitted on the fitting shafts 2414 and 2415 mesh with each other.

The drive gear plate 244 has a film spool fitting shaft 2441 fitted into the spool drive hole 523b of the film spool 52 and a drive shaft insertion portion 2442 into which the drive shaft 247 is inserted. The inside of the shaft 2441 and the drive shaft insertion portion 2442 is hollow, and a part thereof is cut out. The cut key 2443 has a drive key 2471 of the drive shaft 247 and a flange 24.
72 is inserted. The gear plate 244 has another notch 2444, into which another flange 2473 of the drive shaft 247 is fitted. A spring housing 2474 for housing the coil spring 245 is formed at the center of the drive shaft 247.

After these members are assembled to the main body 241, the holding plate 243 is covered. The support wall 2412 of the main body 241 has two screw holes 2412a and 2412a.
b is provided, and the mounting hole 24 is provided at a position of the holding plate 243 corresponding to the two screw holes 2412a and 2412b.
32a and 2432b are provided, and the pressing plate 243 has a driving gear plate 244 and a driving shaft insertion portion 2442.
The holding plate 243 has a center hole 2433 through which the drive shaft insertion portion 2442 of the drive gear plate 244 is inserted into the center hole 2433, a positioning pin 2416 inserted into the positioning hole 2431, and a mounting hole 2432a,
Reference numeral 2432b covers the main body 241 so as to communicate with the screw holes 2412a and 2412b, and is fixed to the main body 241 with two mounting screws 248a and 248b.

The cartridge lid 24 assembled in this manner is rotatably attached to the bottom of the camera via the hinge shaft 242.

Here, the cartridge loading chamber 2 shown in FIG.
The fixed shaft 231 protruding into the cartridge loading chamber 23 is inserted into the spool driving hole 523a of the film spool 52 of the film cartridge 50 loaded in the third cartridge 3 so that the film spool 52 is inserted into the cartridge loading chamber 23. Positioning has been done.

Further, the other of the film cartridge 50
One of the spool drive holes 523b has the cartridge lid 24
A film spool fitting shaft 2441 of the drive gear plate 244 constituting the drive gear plate 244 is fitted, and a drive shaft 247 is inserted inside the spool fitting shaft 2441.
Is pushed up by the coil spring 245. Thus, the spool drive shaft 525 in which the flange portions 2472 and 2473 of the drive shaft 247 form the spool drive hole 523b.
b, the film spool 52 is offset in the axial direction, the axial position of the film spool 52 is stabilized, and the running of the photographic film 53 wound on the film spool 52 is stabilized.

In feeding the photographic film 53, the opening / closing lid 54 of the film entrance 511 of the film cartridge 50 needs to be opened. In this camera, when the film cartridge 50 is loaded into the cartridge loading chamber 23, it is opened and closed. An opening / closing shaft drive shaft 232 serving as a camera-side member is inserted into an engagement hole 542a formed by the shaft 541a.
Is inserted into the key groove 543a and the cartridge lid 24 is closed, and the opening / closing shaft drive shaft 232 is rotated by a mechanism in the camera, and the opening / closing shaft 54 is retracted from the film entrance 511, and the film entrance 511 is opened.

The driving force for rotating the film spool 52 is transmitted from inside the camera to the idler gear 24 shown in FIG.
6, the idler gear is meshed with the drive gear plate 244, so that the driving force is transmitted to the drive gear plate 244, and when the drive gear plate 244 rotates, the drive shaft 2
47 also rotates, and since the drive key 2471 of the drive shaft 247 is fitted in the key groove 524b of the spool drive shaft 525b, the film spool 52 rotates, whereby the photographic film 53 is sent out from the film entrance 511, The photographed film is again wound and stored in the film cartridge 50.

FIG. 7 is an exploded perspective view showing another example of the cartridge lid that can be attached to the camera 10 shown in FIG. 2 instead of the cartridge lid 24 shown in FIG. 7, components corresponding to those of the cartridge lid shown in FIG. 5 are denoted by the same reference numerals as those in FIG. 5, and differences will be described.

FIG. 8 shows a cartridge lid having a structure shown in FIG. 7 in which a film cartridge is loaded in the cartridge loading chamber of the camera 10 when the cartridge lid 34 shown in FIG. 7 is attached to the camera 10 shown in FIG. It is sectional drawing in the state where was closed.

The cartridge lid 34 shown in FIG.
Drive gear plate 244 constituting the cartridge lid 24 shown in FIG.
Instead of both the drive shaft 247 and the drive shaft 247, a drive gear plate 344 serving both of them is provided. The drive gear plate 344 includes a spool fitting shaft 3441 fitted into a spool drive shaft 523b of the film cartridge 50,
When the spool fitting shaft 3441 fits into the drive shaft 523b of the film cartridge 50, the drive key 3442 (the drive shaft 247 shown in FIG. 5) inserted into the key groove 524b.
And the coil spring 42).
5 has a flange portion 3443 (which replaces the flange portions 2472 and 2473 of the drive shaft 247 shown in FIG. 5) for pressing the film spool 52 of the film cartridge 50 in the axial direction thereof.

When the driving gear plate 344 is provided, FIG.
Compared with the embodiment shown in FIG. 6, the number of parts is smaller, and the cost is reduced.

[0045]

As described above, according to the present invention, in a camera of a type in which a film cartridge is loaded, positioning of a photographic film is performed, and a camera with good photographic film running property is realized.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a camera according to an embodiment of the present invention as viewed obliquely from the front.

FIG. 2 is an external perspective view of the camera of FIG. 1 viewed from a direction in which a back surface and a bottom surface appear.

FIG. 3 is a longitudinal sectional view of the film cartridge.

FIG. 4 is a view showing a part of the film cartridge in a cross section in a lateral direction.

FIG. 5 is an exploded perspective view showing a structure of a cartridge lid of the camera shown in FIG. 2;

FIG. 6 is a cross-sectional view showing a state where a film cartridge is loaded in a cartridge loading chamber of the camera and a cartridge lid is closed.

7 is another cartridge lid that can be attached to the camera shown in FIG. 2 instead of the cartridge lid shown in FIG. 5;
It is an exploded perspective view showing two examples.

8 is a cross-sectional view of the camera shown in FIG. 2 when the cartridge lid shown in FIG. 7 is attached, in a state where a film cartridge is loaded in the cartridge loading chamber and the cartridge lid having the structure shown in FIG. 7 is closed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 camera 11 shooting lens 12 lens barrel 13 finder objective window 14 AF light-emitting window 15 AF light-receiving window 16 AE light-receiving window 17 shutter button 21 finder eyepiece window 23 film cartridge loading chamber 24 cartridge lid 25 cartridge lid opening / closing lock lever 34 cartridge lid Reference Signs List 50 APS film cartridge 51 Cartridge main body 52 Film spool 53 Photographic film 54 Opening / closing lid 241 Main body 242 Hinge shaft 243 Holding plate 244 Driving gear plate 245 Coil spring 246 Idler gear 247 Driving shaft 344 Driving gear plate 511 Film entrance 521 Tube portion 522a, 522b Flange 523a, 523b Spool drive hole 524a, 524b Key groove 525a, 525b Spool drive shaft 532 Display plate 541a, 541 Closing shaft 542a, 542b engaging holes 543a, 543b keyway

Claims (4)

[Claims] 1. A photographic film, comprising: a cartridge loading chamber in which a film cartridge containing a rolled photographic film wound around a film spool is loaded; and a photographic film is fed from the film cartridge loaded in the cartridge loading chamber. A camera for taking a photograph thereon and accommodating a photographed film in the film cartridge, wherein the film spool is disposed in an axial direction of the film spool with respect to a film spool of the film cartridge loaded in the cartridge loading chamber. A driving force transmitting unit that rotates the film spool by transmitting a driving force to the film spool, wherein the driving force transmitting unit elastically presses the film spool in the axial direction of the film spool. Features camera. 2. The camera according to claim 1, further comprising a cartridge cover for opening and closing the cartridge loading chamber, wherein the driving force transmitting unit is provided on the cartridge cover. 3. A gear member which rotates around the axis of the film spool by receiving a driving force, wherein the driving force transmitting portion is provided coaxially with a rotation axis of the gear member, and the gear member and the film An engagement member that engages with both the spool and rotates with the rotation of the gear member to rotate the film spool, and a spring member that urges the engagement member toward the film spool, 2. A camera according to claim 1, wherein said engaging member is urged by said spring member to elastically press said film spool. 4. A driving force transmitting member, wherein the driving force transmitting portion includes an engaging portion that engages with the film spool, and a gear portion that receives a driving force and rotates around the axis of the film spool. A spring member for urging the driving force transmitting member toward the film spool, and a spring member for urging the driving force transmitting member toward the film spool, wherein the driving force transmitting member is urged by the spring member. 2. The camera according to claim 1, wherein the camera presses the film spool elastically.