CA1239794A - Laser recording film - Google Patents
Laser recording filmInfo
- Publication number
- CA1239794A CA1239794A CA000492401A CA492401A CA1239794A CA 1239794 A CA1239794 A CA 1239794A CA 000492401 A CA000492401 A CA 000492401A CA 492401 A CA492401 A CA 492401A CA 1239794 A CA1239794 A CA 1239794A
- Authority
- CA
- Canada
- Prior art keywords
- film
- laser
- recording medium
- recording film
- recording
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
ABSTRACT
A laser recording film prepared by coating a transparent film with a recording medium comprising graphite particles at least 95% of which have a particle diameter of 2 µm or below and at least 40%
of which have a particle diameter of 0.2 µm or below.
Said laser recording film can provide high-resolution, heat-mode recording.
A laser recording film prepared by coating a transparent film with a recording medium comprising graphite particles at least 95% of which have a particle diameter of 2 µm or below and at least 40%
of which have a particle diameter of 0.2 µm or below.
Said laser recording film can provide high-resolution, heat-mode recording.
Description
I
DESCRIPTION
LASER RECORDING FILM
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 laser is used can provide high-resolution, high-speed, high-density recording and further allow real-time writing and reading.
In this process, the 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 Berlioz, 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 a 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 and writing is performed by a difference between the density of a non-imaged area and that of an aged 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-Oxidizing 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 irradi-anion with laser beams.
In the above laser recording films, the recording is performed by irradiating a recording medium come prosing 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 or such a system depend son the film thickness and low-output, 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 isle 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 is 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 differ once 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 carton black is increased, the difference in the optical density on the non-lmaged area can be increased but the adhesive strength of a coated film to a base, the dispersion stability ox 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 invention have found a high-optical density, high-resolution, high-sensitivity laser recording film and reached 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 -~23~
graphite particles at least go of which have a par-tide diameter of 2 Jim or below and at least 40% of which have a particle diameter of 0.2 em or below and a binder.
BRIEF DESCRIPTION OF DRAWINGS
Fig. l 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 lo the particle diameter distribution of graphite par-tides used in Example l and Comparative Example 1.
l... transparent film
DESCRIPTION
LASER RECORDING FILM
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 laser is used can provide high-resolution, high-speed, high-density recording and further allow real-time writing and reading.
In this process, the 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 Berlioz, 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 a 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 and writing is performed by a difference between the density of a non-imaged area and that of an aged 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-Oxidizing 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 irradi-anion with laser beams.
In the above laser recording films, the recording is performed by irradiating a recording medium come prosing 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 or such a system depend son the film thickness and low-output, 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 isle 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 is 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 differ once 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 carton black is increased, the difference in the optical density on the non-lmaged area can be increased but the adhesive strength of a coated film to a base, the dispersion stability ox 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 invention have found a high-optical density, high-resolution, high-sensitivity laser recording film and reached 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 -~23~
graphite particles at least go of which have a par-tide diameter of 2 Jim or below and at least 40% of which have a particle diameter of 0.2 em or below and a binder.
BRIEF DESCRIPTION OF DRAWINGS
Fig. l 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 lo the particle diameter distribution of graphite par-tides used in Example l and Comparative Example 1.
l... transparent film
2... recording medium
3... receptor sheet
4... laser beams Fig. 4 is a schematic view of an apparatus for determining the relationship between -the line width or a recording and a laser radiation energy, Fig. 5 is a diagram showing a radiation energy and positions of measurement of the line widths of recordings obtained, and Fig. 6 is a diagram showing the rota-tionship between the line width of a recording and the magnitude of radiation energy.
S... sample film 6... rotary disc rotating motor 9...Nd:YAG laser The structure of a laser recording film of the present invention is as shown in Fig. 1, and it is formed by coating a laser beam-transmittin~, trays-parent film 1 with a recording medium 2 comprising graphite as heat-absorptive particles which can impact a high optical density and a binder.
The recording is performed in the following way As shown in Fig. 2, laser beams 4 collimated by passing through an ordinary lens system and a collimating device are applied by scanning from the side of a transparent film 1, and the recording medium 2 is evaporated and attached to the image receiving surface of a receptor sheet to record an image. It is pro-fireball that the image receiving surface is mounted in contact with the recording medium 2, and the resole vying power can be further enhanced by improving adhesion there between by application of vacuum.
According to this process, it is possible to obtain positive and negative images by a single operation.
The negative image can be used in, for example, the production of a photo lithographic printing plate and mint nature copy films, etc., and the positive image can be used as a proof copy or a direct printing plate.
The film thickness of the recording medium is usually 2 em or below, desirably 0.2 to 2 em, more desirably 0.2 to 1.0 em, and particularly 0.2 to 0.7 em. In the recording medium with which the transparent film is coated, the proportion of graphite added is 1 to 90~ by weight, based on the total amount of graphite and a binder, but an amount of 50 85~ by weight is usually preferred.
The binders which can be used include acrylic resins such as polymethyl methacrylate and polymethyl acrylate, cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate bitterroot, pie-colic resins, polyvinyl chloride, and vinyl chloride/
vinyl acetate copolymers.
The transparent films Jay he any one that can transmit laser beams, and polystyrene and polyethylene terephthalate films can be mentioned as example.
The above-mentioned laser recording film ox this invention having graphite ox a specified particle diameter has good adhesion of a support film to a recording medium, a low light transmission density and a high resolution.
Best Mode for Carrying Out the Invention The present invention will now be described with reference -to examples.
Example 1 A 75 thick polyester film was coated by means of a bar coaler with a graphite dispersion containing graphite having a particle diameter distribution shown S in Fig. 3 and having the following formulation (Forum-lotion 1), and the coated dispersion was dried to form a recording layer. When this recording film was Irma--dieted with YAW laser (wavelength of 1060 no, output of 10 W, 0.5 J/Cm2 on -the recording medium), an image was transferred to the receptor sheet The variation in the optical transmission density with a film thickness is shown in Table 1 (ultraviolet region) and Table 2 (visible region).
The optical transmission density is the logarithm of a ratio of the intensity of incident light to that of transmitted light.
(Formulation 1) graphite parts ethyl cellulose 36 parts ethyl acetate 1224 parts Comparative Example 1 A 75 thick polyester film was coated by means of a bar coaler with a graphite dispersion containing graphite of a particle diameter distribution shown in ; Fig. 3 and having the following formulation (Forum ration 2), and the coated dispersion was dried to form ~23~
a recording layer. When this recording film was irradiated with YAW laser (wavelength of 1060 no, output of 10 W, 0.5 J/cm2 on the recording medium), an image was transferred to the receptor sheet.
In the same manner as in Example 1, the variation in the optical transmission density with a film thickness is shown in Tables l and 2.
(Formulation 2) graphite 100 parts ethyl cellulose 24 parts isopropyl alcohol 1164 parts Table Dry film Optical transmission density thickness (Ultraviolet region (em) En. 1 Coup. En. l _ _ : 0.30 2.0 1 lo 0.35 2.7 1 2.2 ¦ 20 0.40 3.5 US
: :0.45 4-5 1 2-9 : _ _ I
:
.
"
fly g Table 2 __ Optical transmission density Dry film (Visible region) thickness (em) En. 1 Coup. En. 1 .
0.30 1.5 1.4 0035 1.9 1.6 0.40 2.4 1.9 0.45 3.1 2.3 The relationship between the line width of a recording and the laser radiation energy was deter-mined by the following method on the recording films obtained in Example 1 and Comparative Example 1.
. .
e (Method of measurement) A measuring device shown in Fig. 4 was used.
A sample film 5 was put on a rotary disc 6 and irradiated with beams of Nd:YAG laser 9 OX a SO em-S diameter from the side of the transparent film in a direction of an arrow lo while it was being rotated.
Reference numeral 11 refers to a mirror and 12 to an objective. At this time, the rotary disc 6 was moved along a single axis indicated by an arrow lo by means of a motor running at a constant speed to perform a spiral recording on the sample film.
Fig. 5 shows a radiation energy and the positions of measurement of the line widths of the obtained recordings. A is a peripheral portion, B is an lo intermediate portion, and C is a center position.
Fig. 6 shows the results of the measurements. It shows that the film of the present invention could give a line width of a recording which was stable to changes in radiation energy.
S... sample film 6... rotary disc rotating motor 9...Nd:YAG laser The structure of a laser recording film of the present invention is as shown in Fig. 1, and it is formed by coating a laser beam-transmittin~, trays-parent film 1 with a recording medium 2 comprising graphite as heat-absorptive particles which can impact a high optical density and a binder.
The recording is performed in the following way As shown in Fig. 2, laser beams 4 collimated by passing through an ordinary lens system and a collimating device are applied by scanning from the side of a transparent film 1, and the recording medium 2 is evaporated and attached to the image receiving surface of a receptor sheet to record an image. It is pro-fireball that the image receiving surface is mounted in contact with the recording medium 2, and the resole vying power can be further enhanced by improving adhesion there between by application of vacuum.
According to this process, it is possible to obtain positive and negative images by a single operation.
The negative image can be used in, for example, the production of a photo lithographic printing plate and mint nature copy films, etc., and the positive image can be used as a proof copy or a direct printing plate.
The film thickness of the recording medium is usually 2 em or below, desirably 0.2 to 2 em, more desirably 0.2 to 1.0 em, and particularly 0.2 to 0.7 em. In the recording medium with which the transparent film is coated, the proportion of graphite added is 1 to 90~ by weight, based on the total amount of graphite and a binder, but an amount of 50 85~ by weight is usually preferred.
The binders which can be used include acrylic resins such as polymethyl methacrylate and polymethyl acrylate, cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate bitterroot, pie-colic resins, polyvinyl chloride, and vinyl chloride/
vinyl acetate copolymers.
The transparent films Jay he any one that can transmit laser beams, and polystyrene and polyethylene terephthalate films can be mentioned as example.
The above-mentioned laser recording film ox this invention having graphite ox a specified particle diameter has good adhesion of a support film to a recording medium, a low light transmission density and a high resolution.
Best Mode for Carrying Out the Invention The present invention will now be described with reference -to examples.
Example 1 A 75 thick polyester film was coated by means of a bar coaler with a graphite dispersion containing graphite having a particle diameter distribution shown S in Fig. 3 and having the following formulation (Forum-lotion 1), and the coated dispersion was dried to form a recording layer. When this recording film was Irma--dieted with YAW laser (wavelength of 1060 no, output of 10 W, 0.5 J/Cm2 on -the recording medium), an image was transferred to the receptor sheet The variation in the optical transmission density with a film thickness is shown in Table 1 (ultraviolet region) and Table 2 (visible region).
The optical transmission density is the logarithm of a ratio of the intensity of incident light to that of transmitted light.
(Formulation 1) graphite parts ethyl cellulose 36 parts ethyl acetate 1224 parts Comparative Example 1 A 75 thick polyester film was coated by means of a bar coaler with a graphite dispersion containing graphite of a particle diameter distribution shown in ; Fig. 3 and having the following formulation (Forum ration 2), and the coated dispersion was dried to form ~23~
a recording layer. When this recording film was irradiated with YAW laser (wavelength of 1060 no, output of 10 W, 0.5 J/cm2 on the recording medium), an image was transferred to the receptor sheet.
In the same manner as in Example 1, the variation in the optical transmission density with a film thickness is shown in Tables l and 2.
(Formulation 2) graphite 100 parts ethyl cellulose 24 parts isopropyl alcohol 1164 parts Table Dry film Optical transmission density thickness (Ultraviolet region (em) En. 1 Coup. En. l _ _ : 0.30 2.0 1 lo 0.35 2.7 1 2.2 ¦ 20 0.40 3.5 US
: :0.45 4-5 1 2-9 : _ _ I
:
.
"
fly g Table 2 __ Optical transmission density Dry film (Visible region) thickness (em) En. 1 Coup. En. 1 .
0.30 1.5 1.4 0035 1.9 1.6 0.40 2.4 1.9 0.45 3.1 2.3 The relationship between the line width of a recording and the laser radiation energy was deter-mined by the following method on the recording films obtained in Example 1 and Comparative Example 1.
. .
e (Method of measurement) A measuring device shown in Fig. 4 was used.
A sample film 5 was put on a rotary disc 6 and irradiated with beams of Nd:YAG laser 9 OX a SO em-S diameter from the side of the transparent film in a direction of an arrow lo while it was being rotated.
Reference numeral 11 refers to a mirror and 12 to an objective. At this time, the rotary disc 6 was moved along a single axis indicated by an arrow lo by means of a motor running at a constant speed to perform a spiral recording on the sample film.
Fig. 5 shows a radiation energy and the positions of measurement of the line widths of the obtained recordings. A is a peripheral portion, B is an lo intermediate portion, and C is a center position.
Fig. 6 shows the results of the measurements. It shows that the film of the present invention could give a line width of a recording which was stable to changes in radiation energy.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A laser recording film which comprises a transparent substrate film having thereon a coating layer of a recording medium comprising a binder and graphite particles, wherein at least 95% of the graphite particles have a particle diameter of 2µm or below and at least 40% of the graphite particles have a particle diameter of 0.2µm or below.
2. A laser recording film as defined in claim 1, wherein the thickness of the recording medium is 0.2 to 2µm.
3. A laser recording film as defined in claim 2, wherein the recording medium coating layer comprises 1 to 90% by weight of the graphite based on the total amount of the graphite and the binder.
4. A laser recording film as defined in claim 2, wherein the recording medium coating layer comprises 50 to 90% by weight of the graphite based on the total amount of the graphite and the binder.
5. A laser recording film as defined in claim 4, wherein the binder is polymethyl methacrylate, polymethyl acrylate, ethylcellulose, nitrocellulose, cellulose acetate butyrate, phenol resin, polyvinyl chloride, or vinyl chloride/vinyl acetate copolymer.
6. A laser recording film as defined in claim 4, wherein the transparent substrate film is made of polystyrene or polyethylene terephthalate.
7. A laser recording film as defined in claim 3, 5 or 6, wherein the thickness of the recording medium is 0.2 to 0.7µm.
8. A laser recording film as defined in claim 2, 4 or 5, which is on its recording medium side in contact with an image receiving surface of a receptor sheet.
9. A method of recording information which comprises irradiating laser beams from the transparent substrate side of the laser recording film of claim 1, the recording medium side of the laser recording film being faced with an image receiving surface of a receptor sheet, whereby the recording medium is evaporated and transferred to the image receiving surface.
10. A method as defined in claim 9, wherein the recording medium side of the laser recording film and the image receiving surface of the receptor sheet are tightly held in contact with each other by application of vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000492401A CA1239794A (en) | 1985-10-07 | 1985-10-07 | Laser recording film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000492401A CA1239794A (en) | 1985-10-07 | 1985-10-07 | Laser recording film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1239794A true CA1239794A (en) | 1988-08-02 |
Family
ID=4131554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000492401A Expired CA1239794A (en) | 1985-10-07 | 1985-10-07 | Laser recording film |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1239794A (en) |
-
1985
- 1985-10-07 CA CA000492401A patent/CA1239794A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |