DE4014418A1 - Photographic film cassette - contains two-sided perforated 35 mm film, with first chamber for unexposed film, and second chamber for winding exposed film - Google Patents

Abstract

The cassette has first (1) and second chambers and the second chamber is a 135 cartridge (5) which can be released from the first chamber and an intermediate section. The first chamber and the intermediate section are fixed to one another, or are formed as one piece. The distance between the chambers is approximately equal to the filming format in the film (8) running direction. The intermediate section has an exposure aperture (14) for the lens of a corresp. camera. This aperture is at least larger than the width of the film in the running direction. The rear wall (2) of the intermediate section is closed in a light-tight manner.

Description

The invention relates to a roll film cassette for the Still photography consisting of a first chamber for the unexposed film, a second chamber for Wind up the exposed film and both chambers connecting intermediate piece.

By far the most common roll film system for the Still photography is System 135 (ISO 1007). Because of the widespread use of the system today available laboratory equipment for developing the exposed Films and very easy to make paper prints Stable and therefore very economical. The System 135, however, provides some evidence for the user split up. The insertion of a film into the cameras special older design, requires a certain Ge dexterity. Many cameras are offered today that simplify film loading, the necessary However, the technical effort increases the cost of the cameras and does not lead to the high level of simplicity and Security when inserting films such as the Systems 126 (ISO 3029) and 110 (ISO 7261). A white Another disadvantage is that the film is either  rewound into the cartridge after exposure or in some camera models of newer design before loading must be spooled out of the cartridge. This Rewinding is an additional step and also requires a certain amount of time, which makes the the camera is again "ready to fire" after the exposure film delayed. For cameras of newer design the rewinding of the film is usually done by motor, however, it does not run faster with all cameras than rewinding by hand. In any case, the mo toric rewinding for increased battery consumption. The order winding process also means an additional mechani strain on the film. Another disadvantage is that a not fully exposed Film cannot be removed from the camera without film loss and ge can be changed to another film type, e.g. B. Black and white film against color film or negative film against reversal film. The photographer can be in a sol help trap only in such a way that he partially exposes it rewound the film in the cartridge and against the desired exchanged film. If he wants the previously removed only partially exposed film must finish he put it back into the camera and through Blindbe clearings with covered lens up to the Advance to the point where he exposes the exposure had broken, but often double exposures occur or parts of the film are not exposed to anyone the. So there is film loss, not to mention that the method described is very cumbersome.  

Roll film still systems in which no rewinding of the Films are required, e.g. systems 120 and 127 (ISO 732) or 220 (DIN 4523). Inserting one However, films require even more skill than with System 135, in addition must before loading a film its closure label opened and removed and except the empty reel of the previously exposed film into the rewind station of the camera. Fer ner is that attached to the end of the protective strip Moisturize the label and seal the film eat. Exchange a partially exposed film for another is practically impossible.

Another still film roll film system is the system RAPID (Popular Photography 55 (1964), pp. 56, 57, 87). With this system is inserting a new cartridge into a camera quite simple, but first the Empty cartridge of the previously exposed film into the winding station of the camera. Another after part is that only the package, but not the Cartridge from the manufacturer with an identification of the inside located film can be provided because the film in Always put the camera in a different cartridge - usually into that of the previously exposed film. Out this is why in the beginning and the end of the film stamped a film type identification. In practice it also happens that after exposure from the Mouth of the cartridge protruding end of the film with the  Film type identification, from which the Ent process of the film to be used, verse is pushed all the way into the cartridge. In one such a case must be what only a specialist with a spe is possible, the end of the film again the cartridge be pulled out to the film type he know and the film in the right development process to be able to give. RAPID cartridges are more common assign a writable field on which the photographer can Can note the type of film, but that's just an impractical one sheer makeshift. Another disadvantage of RAPID is that the possible number of recordings per film depends on the system limited and lower than desirable. Also fin the square recording format is nothing special Acceptance. After all, changing one is only partially exposed film not possible.

There are two attempts that have been made to address the disadvantages of to overcome roll film systems described above. It these are systems 126 and 110. Both systems have however, it does not gain market penetration like that System 135. System 126 enables the simplest Film insertion, also rewinding the film is not required The disadvantage, however, is that the system does not has exactly defined image plane, which in practice often leads to shots that are not very sharp. The square format of the film is in the consumption are obviously not as popular as a rectangular landscape format. Another disadvantage is that the package of a film 126 is significantly larger than that of the systems described above.  

The described disadvantages of the system 126 should be eliminated by the system 110. The system has an exactly defined image plane, which leads to sharp images. The rectangular landscape format of the film, which is only 16 mm wide, and the small dimensions of the cassette and associated cameras have led to considerable market success. However, the system has declined since the small format of the images - the area is only a quarter of that of the 135 system (24 × 36 mm ² ) does not permanently satisfy the increased quality demands of consumers.

In DE-AS 11 85 053 a modified cassette 126 described. Through the opening suggested therein in the back wall of the cassette and the use of a camera-side pressure plate is the sharpness of the Improved recordings, the square recording format and the size of the cassette is unchanged. The Exposed films can also not in the photo laboratory highly automated lines for film 135 processed will. The volume of the cassette is also quite large.

The cassette described in DE-OS 30 35 571 has the same shortcomings.

For some years now, so-called one-way or way throwing cameras, also called "film with lens". They contain a standardized film 135, which in a pantry of the camera is included and image for image after each exposure in the one-way Camera 135 cartridge is wrapped.  

After the film is fully exposed, the entire Camera placed in a photo lab where the film was taken and is processed in the facilities for film 135. The empty cameras, also with flash and battery, are ver not. The disadvantage of these "cameras" is that they used only once and not again with a new one Film can be loaded. The batteries of the cameras with flash are used only to a small extent. Therefore, a considerable amount arises with this product Amount of waste to remove additional waste wall is required. Because of the growing ecological Consciousness is also increasingly voiced against such waste-intensive products. The volume of such a "film with lens" that is used for processing must be sent to the photo laboratory is compared to the cartridge 135 contained therein considerably. Is too it is not possible to make a partially exposed film to remove, exchange for another and to expose the former to a later date Despite the simplest version of the camera, it is Art of taking pictures is noticeably more expensive, and that at ge lower image quality and limited possibilities to take pictures because these "cameras" are usually used to keep costs down, no exposure tax tion, distance setting or other equipment Features of modern cameras.

The invention is therefore based on the object Propose still image system in which the photo laboratories exposed films without purchasing new equipment be able to work with the easiest film loading,  where the film doesn’t move before or after exposure must be spooled, in which one only partially exposes The film was taken from the camera and later named value film loss can be exposed to the end Manufacture and assembly of disposable cameras by united easy film loading that reloads the building cash cheap cameras allowed, the technical Effort when building simple and high quality 35 mm Cameras and their battery consumption reduced and at which allows the volume of the finished exposed film is as low as possible.

This extensive task is surprising solved in a way that with a film cassette containing a 35 mm film perforated on both sides a first chamber for the unexposed film, one subsequent intermediate piece and a second chamber to wind up the exposed film as 2nd chamber one standardized cartridge 135 is provided by the first chamber and the intermediate piece is easily detachable. By using a standardized 135 cartridge the exposed film can be used in practically all photo laboratories processed without the purchase of new La boron equipment is required. Even the one-way required process of taking the film out the camera and the disposal of not re-use no cameras. The use of a two came cassette, the first of which is unrelated contains thinned film and the second for winding of the exposed film has the advantage that a new film when inserted into the camera not in one Bobbin must be threaded. There is also no need for a coil  or cartridge. Another principle Licher advantage is that the film is neither before nor must be rewound after exposure; thereby ent the rewinding process falls as such. The cameras are technically simpler since it has no rewind mechanism need, even the batteries are motor-driven Cameras are protected and therefore last longer. Ver Visible double exposures are no longer possible.

In a preferred embodiment of the invention the distance between the two chambers is approximately as large as the recording format in the film running direction. This execution allows easy insertion of a new film. A first partially exposed film can get out of the camera taken and later reinserted and finished until the end be thinned, the film loss only one picture or is a little more.

For the version with closed, light-tight rear Cheapest cameras can be built that none Need back wall. Indicates the back of the cassette arched support surface for the film is sufficient as Auf acquisition lens of an associated camera, e.g. B. disposable or rechargeable cheap camera, a simple lens.

Another advantageous embodiment of the cassette indicates on the back wall next to the edges of the film ordered surveys together with camera-side Stop surfaces define the height of a film channel the one from the back of the cassette and the film on the camera leadership is formed. One in a film channel  The film is only very slightly mechanically stressed suspended and is also an important advance setting that the imaging quality of the lens of the Camera can be used reliably.

In a further embodiment of the invention Cassette has an opening in the rear wall, one camera-side film pressure plate allows passage light. This embodiment is suitable for high quality cameras, because a camera's own pressure plate is as a cassette back wall, which as a mass pro product is subject to certain manufacturing fluctuations. The Film can be exactly in the focus plane in a film channel of the lens, inserting one Cassette is extremely simple. Change one first partially exposed film is possible as above.

In the embodiments described so far, after Expose all images from the cassette of the camera men, the cartridge 135 containing the exposed film detached from the adapter and only the cartridge in a Fo tolabor given for processing. That after the Belich The remaining volume is significantly smaller than in known cassette systems such as 126; the transport of the exposed films from one acceptance point to one Photo laboratory or the post that is often practiced today shipping will be easier. The adapter with the first chamber is no longer needed.

The bracket for the Pa trone 135 is advantageously designed so that  the cartridge's information field and CAS field are not are covered. This allows cameras with one view window in the back cover or for cameras that have a cassette included with light-proof back wall and no back own wall, read the inserted film type the. With cameras in DX version the contacts have free access to the CAS field. The terms "CAS field" and "DX version" are specified in the ANSI standard PH 1.14 Lich explained.

For easy detachability of the cartridge from the rest of the Cassette is the connection between the adapter and the cartridge z. B. as a snap connection or light designed breakable fastening tab.

He then becomes a particularly compact form of the cassette is sufficient if the intermediate piece is so short that the first chamber and the cartridge 135 immediately adjacent are arranged. In this version, the volu the cassette is less than twice the size of one Cartridge 135. The first one is inserted into the camera Chamber including adapter from the cartridge dissolves and into the unwind room and the cartridge into the on winding station of an associated camera. Which extending between the first chamber and the cartridge Film inevitably lies on the film stage of the Camera. After exposure, the film is in the cartridge 135. The first chamber with adapter is no longer needed.  

To protect the film, it is advantageous to use the first Chamber inside to shoulder the film support only to the side of the area to be exposed. This protects the film from scratches.

Since the beginning of the film, i.e. H. the part that last is exposed, completely lightproof protected in nern the first chamber, the film can be practical exposed to the end. The film tongue, that is which requires 135 at the beginning of a standardized film liche, only about 20 mm wide part for threading into the Winding spool of a conventional camera, can ent fall because the manufacturer of a Kas sette to wrap the film and to insert the wrap in the first chamber this tongue is not needed. The out So use of the film is improved, or differently pressed: The for a certain number of shots required film length may be shorter.

Nature and advantageous embodiments of the invention are described below with reference to the accompanying drawings described. It shows

Fig. 1 is a front view of a Kas invention sette with a closed rear wall,

Fig. 2 is a longitudinal section through the cassette of FIG. 1 along line AA,

Fig. 3 is a rear view of the cartridge according to Fig. 1,

FIG. 4 similarly shows a section through a cassette Fig. 1, but with a curved rear wall,

Figure 5 shows the front view of a cassette, the pressure plate has an opening for the passage of the on in the rear wall having an associated camera.,

Fig. 6 shows a longitudinal section through the cassette of FIG. 5 along the line CC,

Fig. 7 shows a further embodiment of a erfindungsge MAESSEN cassette adjacent in both chambers immediacy bar are arranged, in section,

Fig. 8 shows a cassette according to Fig. 7 in the plan view after the film cartridge detached from the spacer and the film was so far removed from the first chamber, the first chamber and the cartridge film in an associated camera can be inserted,

FIG. 9 shows a longitudinal section through a first chamber of the cassette of FIG. 4 along the line BB, which shows the shoulders for guiding the film arranged outside the area of the film to be exposed,

Fig. 10 is a perspective view of a two-piece cartridge made according to the invention and a simplified representation of the method for filling the cassette with a film 135th

The cassettes according to the invention shown in FIGS. 1 to 9 must in practice consist of several parts, for. B. are made by injection molding from plastic. An expedient type of division into two individual parts can be seen from FIG. 10. The cassette then consists of a lower part 17 and a cover 18 . The cassette is filled with a film 135 in such a way that the beginning of a film 8 located in a film cartridge 5 is first detected by means of a winding shaft 19 and wound onto it. Then the film cartridge 5 is placed on the holder 6 b, in such a way that the approximately crescent-shaped projection 7 b engages in the lower end of the film cartridge 5 , which is usually provided with an annular recess. Simultaneously with the process just described, the winding shaft 19 with the wound film 8 is lowered and inserted into the first chamber 1 , which is open at the top. The film 8 inevitably lies in front of the rear wall 2 of the cassette. The winding shaft 19 is now pulled out of the film 8 wound up. Then the lid 18 is placed on the lower part 17 and connected to it firmly and light-tight, for. B. by ultrasonic welding.

The cassette shown in Fig. 1 consists of a first chamber 1 , one of the rear wall 2 and the union bars since 3 a, 3 b existing intermediate piece 4 and the film cartridge 5 , the rule by the Haltela 6 a, 6 b with Projections 7 a, 7 b is attached to the intermediate piece 4 . The film 8 runs between the chamber 1 and the film cartridge 5 . In addition to both edges of the film 8 elevations 9 a, 9 b are arranged, which define the height of a film channel in contact with support surfaces of an associated camera, which is formed from the rear wall 2 and film guides, not shown, of an associated camera. In such a film channel, the film is held exactly in the focal plane of the lens. It can also be seen that the CAS field of the cartridge is exposed, so that the contacts of an associated camera in DX design have unimpeded access.

Fig. 2 shows a section through the cassette of Fig. 1 along the line AA. The support strip 11 supports the upper lip of the film cartridge 5 , while the support lug 12 supports the lower lip. Characterized the by the retaining tabs 6 a, 6 b and the projections 7 a, 7 b on the inter mediate 4 piece cartridge secured against rotation.

Fig. 3 shows the back of the cassette shown in Figs. 1 and 2. It can be seen that the support strip 11 does not cover the information field 13 , which here bears the name of a film type as a non-binding example, so that the film type, e.g. B. at Ka meras with appropriate viewing window in the back cover, un hindered read.

Fig. 4 shows a slightly modified form of the cartridge shown in the preceding FIGS.. The modification consists in the hollow arched rear wall 2 '. A hollow arched rear wall is advantageous if only a simple lens is provided as the lens in particularly simple and inexpensive cameras. This measure reduces edge blurring, which is unavoidable with such a simple lens. The radius of the curvature can be, for example, 200 to 300 mm.

Fig. 5 shows a further advantageous embodiment egg ner cassette according to the invention from the front. In contrast to the cassettes described above, the rear wall of this cassette has an opening 14 . This opening is larger than the film width. This version of the cassette is intended for high-quality cameras that have their own film pressure plate. The camera's own pressure plates can be manufactured with greater precision than the back walls of the cassettes, which are subject to fluctuations in mass production. The pressure plate is pressed in the camera against stop surfaces (not shown), which are dimensioned so that between the pressure plate and the camera-side film guides, a film channel is created in which the film is held with maximum precision in the focal plane of the lens.

Only in this way can the imaging quality of the lens inserted into the camera be used reliably. As can also be seen from FIG. 5, the opening 14 in the rear wall 2 , which has been reduced to the two side strips 2 a, 2 b, is larger than the width of the film 8 . This is necessary because the pressure plate and stop surfaces can only be brought into contact next to the film.

For clarification, FIG. 6 shows the cassette of FIG. 5 again in section, in particular the opening 14 .

Fig. 7 shows a particularly compact embodiment egg ner cassette according to the invention. As can be seen, the intermediate piece arranged between the first chamber 1 and cartridge 5 in the cassettes described so far has been extremely reduced. As a result, the chamber 1 and the film cartridge 5 come into an immediately adjacent position; they are connected to one another almost without any spacing by the retaining tabs 6 a, 6 b. The result is an extremely compact structure with a small volume. The package for such a cassette is significantly smaller than in the previously described embodiments. To insert the film into a camera, the film cartridge is released from the holding tabs 6 a, 6 b, the chamber 1 is placed in the unwinding space of an associated camera and fixed there (e.g. with one hand of the operator). The film cartridge 5 is then inserted into the winding station of the camera, with as much film being drawn out of the chamber 1 as corresponds to the distance between the unwinding room and the winding station (see FIG. 8). With this handling, the film inevitably lies on the image stage of the camera. All that is left to do is to close the back cover of the camera and the insertion is finished.

Fig. 9 shows a longitudinal section through a chamber 1. The inside diameter of the chamber 1 is smaller in the immediate vicinity of the two end faces than in the central area. As a result, the film 8 located inside is supported only on its two edges by the shoulders 16 a, 16 b. The central area of the film to be exposed does not come into contact with the inner wall of the chamber 1 and is protected against back scratches.

In the cassette of Fig. 1, 4 and 5 has the cartridge 5 after complete exposure of the film 8 from the telaschen Hal 6 a, 6 b are dissolved. Normally, this is relatively easy due to the elasticity of the retaining tabs 6 a, 6 b. However, it is also advantageous to use one of the two retaining tabs, e.g. B. the retaining tab 6 a in Fig. 5 with a predetermined breaking point 15 . After the retaining tab has been broken off, the cartridge 5 can be removed without any effort.

List of reference numbers

1 first chamber
2 rear wall
2 ′ curved rear wall
2 a, 2 b side stripes of the rear wall
3 a, 3 b lateral connecting webs
4 intermediate piece
5 film cartridge
6 a, 6 b retaining tabs
7 a, 7 b projections
8 film
9 a, 9 b surveys
10 CAS field
11 support strips
12 support nose
13 information field
14 opening
15 predetermined breaking point
16 a, 16 b shoulders
17 lower part
18 lid
19 winding shaft

Claims (10)

1. Film cassette containing a 35 mm film ( 8 ) perforated on both sides with a first chamber ( 1 ) for the unexposed film, a second chamber for winding up the exposed film and an intermediate piece ( 4 ) connecting both chambers, characterized in that the second chamber is a cartridge 135 ( 5 ) which is easily detachable from the first chamber ( 1 ) and intermediate piece ( 4 ). 2. Film cassette according to claim 1, characterized in that the first chamber ( 1 ) and the inter mediate piece ( 4 ) are firmly connected or are integrally formed. 3. Film cassette according to claim 1, characterized in that the distance between the chambers et wa is as large as the recording format in the direction of the film device ( 8 ) and that the intermediate piece ( 4 ) to the lens of an associated camera towards a Be opening ( 14 ), which is transverse to the running direction of the film ( 8 ) at least in regions greater than the width of the film ( 8 ). 4. Film cassette according to claim 1, characterized in that the rear wall ( 2 , 2 ') of the intermediate piece ( 4 ) is closed light-tight. 5. Film cassette according to claim 4, characterized in that the film ( 8 ) facing side of the rear wall ( 2 ') is designed as a hollow surface. 6. Film cassette according to claim 4, characterized in that the rear wall ( 2 ) in the area next to both edges of the film ( 8 ) has elevations ( 9 a, 9 b), which together with the camera-side stop surfaces define the thickness of a film channel, the from the rear wall ( 2 ) of the cassette and kameraseiti gene film guides is formed. 7. Film cassette according to claim 1, characterized in that the rear wall ( 2 ) of the cassette has an opening ( 14 ) which is at least slightly larger than the film pressure plate of an associated Ka mera. 8. Film cassette according to claim 7, characterized in that the opening ( 14 ) transversely to the direction of the film ( 8 ) is at least partially larger than the width of the film. 9. Film cassette according to claim 1, characterized in that the intermediate piece ( 4 ) between the two chambers is shorter than the recording format in the running direction of the film ( 8 ). 10. Film cassette according to claim 1, characterized in that the film ( 8 ) is at least one frame long shorter than ISO 1007 standard Lich.