It is necessary to input in advance into a silver halide photographic light-sensitive material various information related to the photographic light-sensitive material such as a kind and a production number of the photographic light-sensitive material, the name of manufacturer and the emulsion No., various information related to the photographing with a camera for example, date and time of photographing, aperture, exposure time, strobe conditions, filter used, climate conditions, size of photographing frame, a type of a camera and the use of anamolphic lens, various information necessary for printing, for example, the number of prints, choice of filter, color tasty of the customer and the size of trimming, various information obtained in printing, for example, the number of prints, choice of filter, color tasty of the customer and the size of trimming and other information related to customers from a viewpoint of management and from the viewpoint of an improvement of print quality and the enhancement of efficiency of printing operation.
In conventional photographic light-sensitive materials, it has been impossible to input all of the above information. Only information such as the date and the time of photographing, aperture and exposure time has been inputted optically. In addition, in printing, there has been no means for inputting the above-mentioned information into photographic light-sensitive material.
In a magnetic recording system, recording and playbacking are easy. Accordingly, magnetic recording systems for inputting the above-mentioned various information in photographic light-sensitive materials have been studied, and various technologies have been proposed.
For example, technologies to provide a stripe-type magnetic recording layer wherein fine particles of ferromagnetic substance are dispersed on an emulsion surface at the side of an image portion or a backing surface for recording information such as sound and photographing conditions are disclosed in Japanese Patent Publication Open to Public Inspection (hereinafter referred to as Japanese Patent O.P.I. Publication) Nos. 62627/1975 and 4503/1974 and U.S. Pat. Nos. 3,243,376 and 3,220,843, and, further, technologies to provide a transparent magnetic recording layer wherein necessary transparency is obtained by selecting the amount and the size of magnetic particles on the backing layer of photographic light-sensitive material are disclosed in U.S. Pat. Nos. 3,782,947, 4,279,945 and 4,302,523. In addition, a roll film having on its reverse side a magnetic recording layer containing a magnetic substance capable of recording magnetically and a photographing camera having a magnetic head as well are disclosed in U.S. Pat. No. 4,947,196 and WO90/04254.
By providing the above-mentioned magnetic recording layers, it has come to be possible to record in photographic light-sensitive materials the above-mentioned various information which had been difficult previously and it has come to be promising to record sound and image signals.
On the other hand, it has recently been demanded to reduce the size of a camera. Ordinarily, it is the most effective to reduce the size of a cartridge (magazine) further for the reduction of a camera size. For this, it is necessary to reduce the thickness of a support of a photographic light-sensitive material.
However, when the thickness of a support is reduced, the mechanical strength of the support is lowered, and on some occasions, damages such as folding and breakage starting from a perforation portion are caused.
Since a polyethylene terephthalate film is more excellent in terms of mechanical strength than a cellulose triacetate film, it is possible to reduce the thickness of the support.
However, in the case that a polyethylene terephthalate film is used as a support of a photographic light-sensitive material having a magnetic recording layer, a roll set curl is caused when the film is stored in its shape of a roll at a high temperature. Since this roll set curl cannot be removed sufficiently in the course of photographic processing, contact with a magnetic head cannot be kept satisfactorily. Accordingly, there has been caused a problem of an occurrence of errors in the course of inputting magnetic signals and playbacking thereof.
In addition, when a magnetic recording layer is provided on a support, the magnetic recording layer of a photographic light-sensitive material comes, in contact with a magnetic head in the course of recording and playbacking information, causing the photographic light-sensitive material to be charged to cause an error in the course of playbacking the record.
Furthermore, there has been a problem of adhesion of dust due to static, causing deterioration of a photographic print.
For preventing the above-mentioned problems, there have so far been known methods of providing a conductive layer containing a conductive material. Among these, the use of a crystalline metal oxide has been known useful because of little temperature dependence of conductivity as is disclosed in Japanese Patent O.P.I. Publication No. 143431/1981; however, on the reverse side for impeding the accumulation of static electricity as is disclosed in Japanese Patent O.P.I. Publication No. 62543/1992.
In this meaning, however, flying-off of static charge is not conducted sufficiently in a short time. Especially, when the speed of the conveyance of the photographic light-sensitive material is increased during recording and playbacking of information, an error occurs or the product value of photographic prints is lowered due to adherence of dust caused by static electricity.
In addition, when polyethylene terephthalate is used for assuring mechanical strength of a support, it is easily charged, making more serious problems to be caused occasionally.