Claims
- 1. A portable storage medium comprising:
- storage means storing predetermined information;
- a recording layer for recording visible images corresponding to the predetermined information stored in said storage means when heated at a certain temperature; and
- a pre-printed pattern layer formed on a surface of said recording layer, said pre-printed pattern layer contacting a heating source and being damaged when heated to temperatures above said certain temperature.
- 2. The portable storage medium according to claim 1, wherein said pattern layer is transparent, said pattern layer having a pre-printed pattern that is optically separable from said visible images to be recorded on the recording layer.
- 3. The portable storage medium according to claim 1, wherein said recording layer includes a photothermic conversion material converting light to heat, and a color-developing material which develops color due to heat generated by said photothermic conversion material.
- 4. The portable storage medium according to claim 1, wherein said pre-printed pattern layer includes a fluorescent ink.
- 5. A portable storage medium comprising:
- storage means storing predetermined information;
- a recording layer recording a visible image corresponding to the information stored in said storage means by converting a laser beam to heat, said laser beam being incident upon said recording layer, having a major wavelength and representing the information stored in said storage means;
- a transparent protection film formed on said recording layer, said transparent protection film contacting a heating source and being damaged when heated at temperatures above a predetermined temperature at which said information is recorded on said recording layer; and
- a transparent pre-printed pattern layer formed on said protection film, said transparent pre-printed pattern layer having a transparent pre-printed pattern that is optically separable from said visible image to be recorded on the recording layer.
- 6. The portable storage medium according to claim 5, wherein said recording layer includes a photothermic conversion material having a major absorption wavelength corresponding to the major wavelength of said laser beam, and a color-developing material which develops color due to heat generated by said photothermic conversion material.
- 7. The portable storage medium according to claim 5, wherein said transparent protection film transports said laser beam without damages.
- 8. A portable storage medium comprising:
- storage means storing predetermined information;
- a recording layer for recording visible images corresponding to the predetermined information stored in said storage means when heated at a certain temperature; and
- a pre-printed pattern layer formed on a surface of said recording layer, said pre-printed pattern layer being damaged when heated to temperatures above said certain temperature.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-050668 |
Mar 1993 |
JPX |
|
Parent Case Info
This is a continuation of application No. 08/207,659, filed Mar. 9, 1994.
Foreign Referenced Citations (7)
Number |
Date |
Country |
57-14096 |
Jan 1982 |
JPX |
2-209290 |
Aug 1990 |
JPX |
2-204087 |
Aug 1990 |
JPX |
3-71383 |
Mar 1991 |
JPX |
3-177994 |
Aug 1991 |
JPX |
3-234670 |
Oct 1991 |
JPX |
4-112086 |
Apr 1992 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
207659 |
Mar 1994 |
|