Photocopying – Projection printing and copying cameras – With developing
Patent
1988-05-03
1990-01-09
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
With developing
355100, 355106, 430203, 430353, G03B 2732, G03B 2752
Patent
active
048931489
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for storing a dry silver salt roll film for use in rotary type microphotography in which the roll film is used to obtain continuously exposed images by a high speed camera such as rotary type microphotography camera in such a way that advantages of the dry silver salt roll film are most utilized and also the present invention relates to a rotary type microphotography camera system for a film to be thermally developed.
BACKGROUND ART
Recently, the microphotographic recording of a large amount of documents such as checks, bank bills and so on by using rotary type microphotography cameras or the like have been frequently used in general offices such as banks. However, since wet silver salt films are used, it is necessary that the exchange of harmful processing liquid is carried out by general operators within such general offices. Therefore, there has been a strong demand for a system which can eliminate such harmful and complicated process and operations so that the development process can be accomplished in a simple manner.
Meanwhile, dry silver salt films which can be thermally developed to obtain images have been already developed as convenient silver salt film instead of wet silver salt film and used for various purposes. But, since stabilities of raw or unexposed film and developed images are limited, they have not been used in the rotary type microphotography cameras.
A conventional roll film heater comprises in general a rotating heating roller and a nip roller for ensuring the satisfactory intimate contact of the film with the heating roller so as to ensure the heating of the film. Alternatively, a conventional roll film heater comprises a heating roll and a wool yarn soft member adapted to make the film intimately contact with the heating roller. However, in such roll film heaters with the above-described constructions, the stability and quality of images obtained are greatly influenced by thermal developing conditions.
Some patents and reports disclose a process for making a film into very intimate contact with a heating roller by charging the film with static electricity and a method in which a film is caused to float in the air by the heated air so as to heat the film. (For example, see U.S. Pat. No. 3,585,917)
In general, in most conventional wet and rotary type cameras, a wet developing tank and a drying zone are disposed in the lower portion of the camera or an independent developing unit is used. As a result, the conventional rotary type cameras are large in volume and thus there is a problem that a considerably large installation space is required in the offices. In this manner, the conventional rotary type microphotography camera requires a relatively large developing space, contrary to a desire that the camera is designed to be compact in size. Therefore, it has been impossible to make the wet and rotary type camera considerably compact in size, unlike the rotary type camera using thermally developed films. Furthermore, in the case of a camera in which a wet developing tank, a water washing or rinsing tank and a drying zone are disposed in the lower portion of a camera, there has been a problem that a film loss is increased in the start and end portions of the film to be wound. In addition, the exposure and the development process are not carried out at the same speed, so that it is impossible to check a frame by carrying out developing processes simultaneously with the exposure.
The wet silver salt film does not include addition agents such as developing agent inside the film, so that the life of an unexposed wet silver salt film is longer than that of a dry silver salt film. Thus, in the conventional wet silver salt film rotary type camera, unexposed or raw films are stored only in a place shielded from light.
On the other hand, the storage stability of unexposed dry silver salt films is in general not satisfactory. Therefore, when the unexposed dry silver salt film is loaded in the rotary type camera of the type described abo
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Hayashi Yoshio
Ogawa Shuichiro
Ohnuma Akira
Sanada Masahiko
Asahi Kasei Kogyo Kabushiki Kaisha
Wintercorn Richard A.
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