Laser recording film

Details Laser recording film Laser recording film

1986-01-23

1987-10-27

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428327, 428408, 428480, 428500, 430945, 346 76L, 3461351, B32B 516, G01D 1510

Patent

active

047029587

DESCRIPTION:

BRIEF SUMMARY
FIELD OF INDUSTRIAL APPLICATION

The present invention relates to a laser recording film suitable for heat mode recording utilizing laser beams.
A recording process in which lasers are used can provide high-resolution, high-speed, high-density recording and further allow real-time writing and reading.
In this process, the power of optical energy of laser beams and their resolving power are utilized and the recording of information is performed by using a difference between the optical density of a non-image area and that of an image area which, when a strongly light-absorptive substance is irradiated with laser beams, are formed by the sublimation and evaporation of the irradiated area by the thermal energy of the laser beams.


PRIOR ART

One of the proposed laser recording films is a recording film formed by coating a transparent substrate with recording medium comprising a heat-absorptive fine particles such as carbon black and a binder (see Japanese Patent Laid-Open No. 77780/1971). In this film, the recording is performed by a difference between the density of a non-imaged area and that of an imaged area formed by evaporating fine carbon black particles by irradiation with high intensity lights.
Further, a recording film coated with a recording medium comprising heat-absorptive fine particles such as carbon black and a self-oxidizable binder such as nitrocellulose is proposed (see Japanese Patent Laid-Open No. 43632/1973). In this recording film, the recording of positive and negative images becomes possible by transferring, for example, fine carbon black particles to another recording tape by irradiation with laser beams.
In the above laser recording films, the recording is performed by irradiating a recording medium comprising heat-absorptive particles such as carbon black and a binder with laser beams to form a difference between the optical densities on the film by combustion or ejection.
The resolving power of a laser recording film of such a system depends on the film thickness and lowoutput, high-density, high-resolution recording can be performed when a thin film is used.
When the coated film is thin, however, the optical density itself of a non-irradiated area is decreased and rise is given to a problem at the time of, for example, reading of recorded information. Namely, in the case of heat mode laser recording, carbon black, graphite, or the like are used as the heat-absorptive particles, and the optical density is decreased when these particles are coated to form a thin film, which causes a decrease in resolving power or in the difference between the optical density of an image area and that of a non-image area.
When the amount of the added heat-absorptive particles such as carbon black is increased, the difference in optical density can be increased but the adhesive strength of a coated film to a base, the dispersion stability of a coating solution, etc., are worsened. Therefore, the amount of the particles added has been limited.


DISCLOSURE OF THE INVENTION

As a result of extensive studies to eliminate these problems, the inventors of the present application have developed a high-optical density, high-resolution, high-sensitivity laser recording film leading to the present invention.
Namely, the present invention provides a laser recording film which can be prepared by coating a transparent film with a recording medium comprising graphite particles at least 95% of which have a particle diameter of 2 .mu.m or below and at least 40% of which have a particle diameter of 0.2 .mu.m or below and a binder.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a sectional view of a laser recording film of the present invention,
FIG. 2 is a schematic sectional view of a recorder in which a film of the present invention is used, and
FIG. 3 is a diagram of the particle diameter distribution of graphite particles used in Example 1 and Comparative Example 1.
In the drawings element 1 is a transparent film; element 2 is a recording medium; element 3 is a transferred image receiving body; and element 4 are the

REFERENCES:
patent: 3787873 (1974-01-01), Sato et al.
patent: 4245003 (1981-01-01), Oransky et al.

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