JP2741957B2 - Sheet film pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet film pack in which a plurality of sheet films are stacked and stored, and a photograph can be sequentially taken on these sheet films.

[0002]

2. Description of the Related Art A large camera such as a view camera or a studio camera is used to take a photograph for creating a product catalog or a photograph on the premise of a large stretch. The size of a film used in a large-sized camera is 4 × 5 inches or more, and is particularly effective when sharpness is required. Among such large cameras, there is a type in which a photographic dry plate or a sheet film having a large film size is exchanged for each photographing, but a rapid response cannot be taken when photographing is repeated.

[0003] Such inconvenience can be solved by using a film holder known as "4x5 quick changer (trade name)" commercialized by the present applicant, for example. This film holder is composed of an outer frame mounted on the camera and an inner frame housed in the outer frame. About 5 to 10 sheet films are stacked and stored in the inner frame, and a slidable lid is provided to shield the exposure opening formed on the front surface of the inner frame. In addition, the inner frame itself is slidable with respect to the outer frame. After the outer frame is attached to the camera, the sliding operation of the lid and the inner frame is performed alternately, so that the exposed film is the lowermost layer of the inner frame. And sent to
The new film is set on the top layer, which is the shooting position. Therefore, by operating the lid and the inner frame, it is possible to perform shooting for the number of sheet films. In addition, the actual opening 50
Japanese Unexamined Patent Publication No. 22029 discloses a structure in which a holder body mounted on a camera is provided with two chambers partitioned by partition walls, one of which is used as a storage room for unexposed sheet films and the other is used as a collection room for sheet films. ing. A film holder in which an exposed sheet film is fed into a collection chamber by a film transfer operation after photographing is disclosed, and it is possible to repeatedly perform photographing on a plurality of sheet films previously loaded in a storage chamber. I can do it.

[0004]

However, in the above-mentioned conventional film holder, it is possible to successively take pictures of about 5 to 10 sheet films previously loaded in the holder in a dark room. If it is anticipated that the photographing will be continued more times, some film holders must be prepared. Therefore, aside from shooting in the studio, outdoor photography such as mountain photography has not only a problem in portability, but also after taking a picture of one film holder, the outer frame of a new film holder is re-opened. It had to be positioned and mounted on the camera, and improvement in operability was also desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a sheet film which can be photographed many times quickly using a sheet film and which is excellent in portability. The purpose is to provide a pack.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a conventional film holder in which the outer frame and the inner frame cannot be separated from each other, resulting in various problems. Focusing attention, a film pack in which sheet films are stacked and stored can be separated from a pack holder mounted on a camera in the same manner as the outer frame.
The film pack has an exposure opening on the front surface, a sheet storage chamber for stacking and storing a plurality of unexposed sheet film units in a state where a light shielding sheet is stacked on the uppermost layer, and an exposed sheet film unit. And a sheet collecting chamber into which the sheet is fed, and these two chambers are partitioned by a partition. A slit is provided at the upper end of the partition, and when the lid provided on the pack holder is slid in the opening direction, the light shielding sheet or the exposed sheet film unit located on the uppermost layer of the sheet storage chamber is opened. The sheet is sent to the sheet collection chamber through the slit.
The light-shielding sheet shields light from the exposure opening from reaching the sheet film unit in the sheet storage chamber when the film pack before photographing is handled by itself. In order to prevent the light from reaching the sheet film unit in the sheet collecting chamber through the exposure opening and the slit when the film pack is handled alone after the photographing, a second light shielding sheet may be provided on the uppermost layer in the sheet collecting chamber. It is effective to cover and shade.

[0007]

In FIG. 1, a film pack 2 to which the present invention is applied is used by being loaded into a pack holder 3 and can be removed from the pack holder 3 when not in use.
The pack holder 3 is used with its front surface mounted on a camera mounting frame, and the photographing opening 4 matches the aperture on the camera side. The ridges 5 are used for positioning when the pack holder 3 is mounted on the mounting frame of the camera. On one side of the pack holder 3, a pack insertion opening 6 is formed, through which the film pack 2 is inserted. The shooting aperture 4
In order to open and close, the pack holder 3 has a handle 7a at one end.
Is attached, and the slide lid 7 is slidable using the groove 8 as a guide. By closing the lid 7, the photographing opening 4 is closed light-tight.

As shown in FIG. 3, a hook 9 is fixed to the tip of the lid 7. As will be described in detail later, the hook 9 engages with a light-shielding sheet or a sheet film unit stored in the film pack 2 when the lid 7 is slid in the opening direction, and transports them. In addition, the rear end of the hook 9 serves as a stopper when the lid 7 is slid in the opening direction. Further, a lock claw 10 urged in the protruding direction is provided at the back of the pack insertion slot 6 to prevent the film pack 2 from being inserted into a groove formed on the bottom surface of the film pack 2 and accidentally pulled out. Reference numeral 11 denotes a knob for moving the lock claw 10 to the retracted position, and reference numeral 12 denotes a film counter.

The film pack 2 has a box-shaped pack body 15 having a substantially rectangular parallelepiped outer shape. Pack body 15
The inner space is partitioned by a partition 16 into a sheet storage chamber 17 and a sheet collection chamber 18, and an exposure opening 19 is formed on the front surface of the sheet storage chamber 17. The exposure opening 19
Notches 19a are formed at both end edges of the hook, so that the hook 9 can enter a position slightly beyond the partition 16 when the sliding lid 7 is fully slid in the opening direction.

In the sheet storage chamber 17, for example, six sheet film units 20 shown in FIG. The sheet film unit 20 is composed of a 4 × 5 inch sheet film 20a and a thin metal sheet sheath 20b that supports the base surface thereof and has four sides bent so as to surround the four end sides of the sheet film 20a. A concave portion 21 is formed on both sides of the distal end portion of the sheath 20b. If the flatness of the sheet film 20 is maintained and the sheet film 20 has sufficient strength, the sheath 20b can be made of plastic.

As shown in the sectional view of the main part of FIG. 3, in addition to the above-mentioned six sheet film units 20 in the sheet storage chamber 17, the first light shielding sheet 2 is provided in the uppermost and lowermost layers.
2. The second light shielding sheet 23 is overlaid. These are urged to the front side by the pressure plate spring 24. Therefore, the first light shielding sheet 22 blocks the exposure opening 19, and the sheet storage chamber 17 is kept light-tight. Thus, even if the film pack 2 is handled alone with the unexposed sheet film unit 20 inserted in the sheet storage chamber 17, the sheet film unit 20 will not be exposed to external light. Note that the first and second light-shielding sheets 22 and 23 also have a concave portion 21 having the same shape as the concave portion 21 at a corresponding position.

A slit 25 is formed between the upper end surface of the partition 16 and the inner wall of the front surface of the pack body 15. The gap between the slits 25 is slightly larger than the thickness of one sheet film unit 20. The upper end surface of the partition 16 and the inner wall facing the upper end face have a
6 is stuck so that even if light enters from the exposure opening 19, it hardly enters the sheet collection chamber 18. A pressing spring 27 is provided on the upper inner wall of the sheet collecting chamber 18 and guides and presses the sheet film unit 20 and the like sent through the slit 25 to the bottom side.

The operation of the above configuration will be described. As shown in FIG. 4, the pack holder 3 loaded with the film pack 2 is mounted on an exposure frame 35 of a large format camera. At this time, the ridges 5 provided on the front surface of the pack holder 3 are used for positioning. When the sliding lid 7 is pulled, the tip of the hook 9 engages with the concave portion 21 of the first light shielding sheet 22 located on the uppermost layer of the sheet storage chamber 17, and
The light collection sheet 1 is passed through the light shielding sheet 22 through the slit 25.
Transfer to 8. When the lid 7 is fully pulled, the first light shielding sheet 22 passes through the slit 25 and is fed to the bottom side of the sheet collecting chamber 18 by the urging of the pressing spring 27 as shown in FIG. Step forward.
When the first light-shielding sheet 22 is sent into the sheet collecting chamber 18 in this manner, the first sheet film unit 20 positioned below the first light-shielding sheet 22 is pressed against the exposure opening 19 from the inside by the urging force of the pressure plate spring 24. And enters the shooting standby state.

In the state shown in FIG. 5, the first exposure is performed by opening and closing the shutter of the large format camera. After the first image has been photographed in this way, the lid 7 is once pushed in to remove the pack holder 3.
After returning to the position where the photographing opening 4 is completely covered, the sliding lid 7 is again slid in the opening direction. At the initial stage when the lid 7 is pulled out again, the tip of the hook 9 engages with the concave portion 21 of the exposed sheet film unit 20. Therefore, when the lid 7 is further pulled, the first light shielding sheet 22 is collected. In the same manner as when the sheet film unit 20 has been transferred to the chamber 18, the exposed sheet film unit 20 is fed into the sheet collection chamber 18 through the slit 25 as shown in FIG. Then, when the first exposed sheet film unit 20 is completely sent to the bottom side of the sheet collecting chamber 18, the second sheet film unit 20 moves to the uppermost layer of the sheet storage chamber 17, that is, the exposure position. Again to be in the shooting standby state.

Thereafter, the shutter opening / closing operation of the large format camera,
Each time the lid 7 is reciprocated, exposure to a new sheet film unit, feeding of the exposed sheet film unit into the sheet collection chamber 18 and simultaneously moving the unexposed sheet film unit to the exposure position, and furthermore, the film The increment of the counter 12 is repeated. When the sixth sheet film unit 20 is exposed, and the lid 7 is once pushed in and then pulled out, the sixth exposed sheet film unit 20 is transferred to the uppermost layer of the sheet collection chamber 18. At this point, the second light shielding sheet 23 is located below the exposure opening 19 of the sheet storage chamber 17. Then, when the sliding lid 7 is further slid back and forth, the second light shielding sheet 23 is also fed into the sheet collecting chamber 18, and the second light shielding sheet 23 is covered on the uppermost layer of the exposed sheet film unit 20. The second light-shielding sheet 23 is pressed against the sixth exposed sheet film unit 20 by the urging.

After the second light-shielding sheet 23 has been transferred to the sheet collecting chamber 18, the sliding lid 7 is pushed in as shown in FIG. As a result, the lock on the knob 11 is released, so that the knob 11 can be operated to move the lock claw 10 to the release position, and the film pack 2 can be removed from the pack holder 3. When the film pack 2 is pulled out from the pack holder 3, external light enters through the exposure opening 19. However, a telem 26 is stuck on the slit 25, and the outermost layer of the sheet collection chamber 18 has 2 The light shielding sheet 23 is located,
In addition, since the pressure is applied to the exposed sheet film unit 20 by the urging force of the pressing spring 26, no fogging occurs in the sheet film unit 20 due to external light.

The taken out film pack 2 is collected as it is in a developing station, where the exposed sheet film unit is taken out and developed. In the case of continuing photographing, a new film pack 2 may be inserted from the pack insertion opening 6 of the pack holder 3 without removing the pack holder 3 from the exposure frame 35. Therefore, for example, in the case of taking a picture outside the studio, it is possible to take a picture while sharing one pack holder 3 and sequentially replacing several film packs 2.

[0018]

As described in detail above, according to the sheet film pack of the present invention, the pack body itself has a light shielding function, and is separated from the pack holder mounted on the camera regardless of before and after shooting. However, since the sheet film housed inside is kept light-tight, a plurality of sheet film packs can be shared by one pack holder, and one pack holder is used when performing multiple shots. It is only necessary to prepare a number of sheet film packs corresponding to the number of times of shooting, which is advantageous in terms of portability. Further, since the sheet film pack can be loaded and unloaded while the pack holder is still mounted on the camera, it is troublesome to position the pack holder on the camera and mount it after each use of one sheet film pack. Can be omitted, and the operability is greatly improved.

[Brief description of the drawings]

FIG. 1 is an external view of a pack holder and a film pack.

FIG. 2 is a partially cutaway perspective view of a sheet film unit.

FIG. 3 is a cross-sectional view of a main part in a state where a film pack is inserted into a pack holder.

FIG. 4 is a cross-sectional view of a main part of the first light-shielding sheet in a state of being transferred.

FIG. 5 is a sectional view of a main part in a photographing state.

FIG. 6 is a sectional view of a main part of the exposed sheet film unit in a state of being transferred.

FIG. 7 is a cross-sectional view of a main part in a state where a shooting operation is completed.

[Explanation of symbols]

 2 Film Pack 3 Pack Holder 7 Lid 15 Pack Body 16 Partition 17 Sheet Storage Room 18 Sheet Collection Room 20 Sheet Film Unit 22 First Light Shielding Sheet 23 Second Light Shielding Sheet

Claims (2)

(57) [Claims] 1. A photographing opening is formed on a front surface mounted on a camera, and a pack insertion opening is formed on one side surface.
In a sheet film pack used by being loaded into a pack holder provided with a lid for opening and closing the photographing opening,
A plurality of sheet film units are stacked and stored in a state in which the light shielding sheet is stacked on the uppermost layer, and a sheet storage chamber having an exposure opening formed on the front surface, and when the sliding lid is slid in the opening direction, A sheet collection chamber into which the uppermost light-shielding sheet or sheet film unit in the sheet storage chamber is fed, a partition partitioning the sheet storage chamber and the sheet collection chamber, and an opening direction of the lid provided at an upper end of the partition. A light-shielding sheet or a slit serving as a passage of the sheet film unit which is moved from the sheet storage chamber to the sheet collection chamber by a sliding operation to the light-shielding means for blocking light traveling through the slit toward the sheet film unit in the sheet collection chamber; The light-shielding sheet or sheet film unit of the sheet storage chamber is pressed against the exposure opening. A pressure plate spring which biases the sheet film pack, characterized in that comprising a pressing spring for urging the light shielding sheet or sheet film units have been fed into the sheet collecting chamber toward the rear side. 2. The light-shielding means is a second light-shielding sheet that is put on a sheet film unit that has been exposed last and sent to a sheet collection chamber, and the second light-shielding sheet is a lowermost layer of the sheet storage chamber. 2. The sheet film pack according to claim 1, wherein the sheet film pack is stored in a sheet.