JPH0715743B2 - recoding media - Google Patents

Description

Detailed Description of the Invention a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium provided with both a photographic material section and a magnetic recording section.

(B) Conventional technology In recent years, a disc film system in which each frame of a photographic film used for photographing is arranged on the same circumference has appeared.

An example of the disc film is shown in FIG. In this example,
The magnetic recording ring 3 is arranged inside the magnetic recording ring 1
It is integrally manufactured by injection molding with the display unit 4 displaying the frame numbers of 15 to form a supporting member, and the core 2b is provided around the supporting member.
In this example, the photosensitive material 2 consisting of 15 frames of the photographing portion 2a is fitted.

The disc film supporting member on which the photosensitive material is mounted is attached to the front cover 6 and the back cover 7 by the hinge 8 shown in FIG.
It is housed in a case 5 made up of and constitutes a disc film cartridge.

The ring 3 is a magnetic recording medium for recording print conditions.

Recording and reproduction on the ring 3 is performed by a code based on a combination of "0" and "1" and a method of recording, detecting and reproducing a code by using a magnetic head.

However, it was found that the presence of the ring 3 near the film causes fog.

Conventionally, iron oxide powder has been used as the magnetic particles of the ring 3, but this is manufactured using iron sulfate as a raw material, and the manufacturing method is based on the following reaction.

(1) Manufacturing method of Fe ₃ O ₄ particles: FeSO ₄ + 2NH ₄ (OH) → Fe (OH) ₂ + (NH ₄ ) ₂ SO ₄ 3Fe (OH) ₂ + NaOH + HNO ₃ → Fe ₃ O ₄ + NaNO ₂ + 4H ₂ O ( 2) Manufacturing method of Fe ₂ O ₃ particles: FeSO ₄ · 7H ₂ O → FeSO ₄ · H ₂ O + 6H ₂ O (about 400 ° C) 2FeSO ₄ · H ₂ O → Fe ₂ O ₃ + SO ₂ + SO ₃ + 2H ₂ O (dry method) Method) FeSO ₄ + 2ROH → Fe (OH ₂ ) + R ₂ SO ₄ 2FeSO ₄ + 1 / 2O ₂ + 3H ₂ O → Fe ₂ O ₃ · H ₂ O + 2H ₂ SO ₄ 2H ₂ SO ₄ + 2Fe → 2FeSO ₄ + 2H ₂ (wet method) in other words, the sulfur compounds produced by the above reaction (S ▲ O ^2- ₄
▼, SO ₃ , SO ₂ ) (H ₂ S may be considered in addition to this), but it is mixed as an impurity in the obtained Fe ₃ O ₄ powder or Fe ₂ O ₃ powder.

The present inventor has conducted a study on a disk film or the like provided with a magnetic recording ring using an iron oxide powder as a magnetic material. I found that it would happen.

C, the object of the invention The present invention has been achieved based on the above findings,
An object of the present invention is to provide a technique for preventing a problem such as fog in a photographic light-sensitive material of a recording medium provided with both a photographic light-sensitive material portion and a magnetic recording portion.

D. Structure of the Invention That is, the present invention is a recording medium provided with a photographic light-sensitive material section and a magnetic recording section, wherein the magnetic recording section contains a substance having a large affinity with a sulfur compound. The present invention relates to a recording medium. Here, the "affinity" means
It means a property of easily reacting with a sulfur compound and converting this compound into another compound, or a property of trapping a sulfur compound.

Examples of the substance having a high affinity with the sulfur compound include hydroxides of elements of Group IA, IIA and IIIA of the Periodic Table of the Elements, II
A substance consisting of one or more selected from the group consisting of oxides of Group A and Group IIB elements and carbon salts of Group IA and Group IIA elements is suitable. The powder may be mixed with the magnetic particles, or may be adsorbed on the surface of the magnetic particles.

E, Example Experimental Example 1 NaOH, Ca (OH) ₂ , Mg (OH) ₂ , Al (OH) ₃ , NaCO ₃ , C
_{aCO 3, MgCO 3, NaHCO 3} , CaO, powders of MgO or ZnO 3% by weight (hereinafter, expressed by weight% simply by "%".) (average particle size
Magnetic Fe ₃ O produced from iron sulfate containing 25 μm each
0.5 g of the ₄ powder was placed in a metal can with a volume of 50 ml, sealed together with a 35 mm color film of ASA400 cut into a length of 12 cm, sealed, and kept at 55 ° C. for 7 days. Take out each of the above films,
Fog density was measured with a transmission densitometer using a filter corresponding to each photosensitive layer, which was obtained by subjecting a sample obtained by wedge exposure to a predetermined development process. When the fog density of the same type of film not subjected to the above treatment was used as a blank (reference value: zero) and the difference from this blank was evaluated, no difference was found.

Experimental Example 2 Magnetic Fe ₃ O ₄ powder produced from iron sulfate was added to NaOH, Ca (O
H) ₂ , Mg (OH) ₂ or Al (OH) ₃ 10% in a 7% aqueous solution.
The same test as in Experimental Example 1 was performed except that the powder that had been soaked for a minute, washed, and dried was used, and no difference from the blank was found.

Experimental Example 3 NaOH, Ca (OH) ₂ , Mg (OH) ₂ , Al (OH) ₃ , NaCO ₃ , C
_{aCO 3, MgCO 3, NaHCO 3} , CaO, of MgO or ZnO powder (particle size 0.
1 μm to 0.1 mm) was dispersed in polystyrene resin by 3% for injection molding, and a pellet-like sample having a diameter of 3 mm and a length of 3 mm was used. Otherwise, the same test as in Experimental Example 1 was performed, and a blank was obtained. No difference has occurred.

For comparison, only acidic Fe ₃ O ₄ powder produced from iron sulfate and the film were housed in a can and the same test was performed. As a result, the difference from the blank was +0.12 for the blue light-sensitive layer, The green photosensitive layer was +0.09 and the red photosensitive layer was +0.06.

From the above experimental results, the periodic table of elements IA, IIA and I
Action of substances selected from the group consisting of hydroxides of II A elements, oxides of II A and II B elements, and carbonates of IA and II A elements to prevent fog formation by sulfur compounds It can be understood that Further, the above substances can be used in combination.

Next, specific examples of the present invention will be described.

The disk body 15 having the magnetic recording ring 3 and the display section 4 shown in FIG. 1 is formed of NaOH, Ca (OH) ₂ , Al (OH) ₃ , MgO, Zn.
3% of O, KHCO ₃ or CaCO ₃ particles (average particle size 10 μm) were mixed with magnetic Fe ₃ O ₄ powder manufactured from iron sulfate,
The mixed powder was dispersed in polystyrene resin in an amount of 10% and injection-molded, and these were fitted to the film 2 as shown in the enlarged view of FIG.

When the fog density of each of these disc films was measured by sensitometry, all the constituent layers were substantially 0. For comparison, the same measurement was carried out on a conventional disc film in which the above-mentioned disc body was not blended with the above powder, but the fog density was 0.
88, the green photosensitive layer was 0.38, and the red photosensitive layer was 0. The fog density is desired to be 0.03 or less for each color, and the fog density is significantly higher than this value in the conventional disc film. On the other hand, in the disc films using the composition according to the present invention, the fog density is substantially 0 for each color in any of the examples, and the fog phenomenon due to the magnetic particles is completely suppressed.

In the composition of the present invention, the content of the substance having a high affinity for the sulfur compound is preferably 0.1 to 100 parts by weight, more preferably 1 to 30 parts by weight, based on 100 parts by weight of the magnetic particles. If the amount of the substance deviates from this range, the effect of preventing fogging tends to be difficult to obtain, and if the amount of the substance increases, the ratio of the magnetic substance in the component decreases, so that the magnetic properties are likely to deteriorate, and the content in the resin tends to decrease. Mechanical kneading tends to occur when kneading. Further, regarding the contained form of the above substance, when it is granular, the particle size is preferably 0.1 to 100 μm.

In addition, by containing the substance according to the present invention, the effect of suppressing corrosion of a mold used for injection molding or the like can be obtained.

Further, instead of the magnetic recording ring 3, a magnetic recording medium of an appropriate shape can be provided at an appropriate position of the case 5 shown in FIG. 2, and in addition, it can be provided on the outer surface of the 35 mm film cartridge. It is also possible.

The above examples are all examples in which the present invention is applied to a disc film. In addition, as shown in FIG. 4, for example, a recording strip 13 made of the composition of the present invention is provided on the side edge of the film 12. It is needless to say that the same effect as described above can be obtained even when applied to the movie film 21 provided in.

In the above example, Fe ₃ O ₄ is used for the magnetic particles. The magnetic particles may be filed with Fe ₂ O ₃ particles or iron powder but, Fe ₃ since O ₄ has a black color, in this respect, Fe ₃ as a composition for providing integral with a black film support member O ₄
Particles are preferred. Further, the substance having a high affinity with the sulfur compound used in the present invention may have a further action in addition to the above-mentioned action on the sulfur compound.

F. Effects of the Invention As described above, the magnetic recording composition according to the present invention contains at least a substance having a large affinity with a sulfur compound, so that the fogging effect of the sulfur compound on the photographic light-sensitive material is suppressed. To be done.

[Brief description of drawings]

FIG. 1 is a plan view of the disc film, and FIG. 2 is a development view of a case for accommodating the disc film. FIGS. 3 and 4 show an embodiment of the present invention. FIG. 3 is a cross-sectional view of a disc film, and FIG. 4 is a plan view of a movie film having a recording band area. In the reference numerals shown in the drawings, 2, 12 ... film 3 ... magnetic recording medium ring 3 ... display 5 ... case 13 ... recording band 15 ... disk 21 ... movie It is a film.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-48-98804 (JP, A) JP-A-57-198539 (JP, A) JP-A-54-143608 (JP, A)

Claims (2)

[Claims] 1. A recording medium provided with a photographic light-sensitive material section and a magnetic recording section, wherein the magnetic recording section contains a substance having a high affinity with a sulfur compound. 2. The recording medium according to claim 1, wherein the substance having a large affinity with the sulfur compound is a periodic table I.
Group A, II A and III A element hydroxides, II A and
At least one selected from the group consisting of oxides of Group II B elements and carbonates of Group IA and Group II A elements.