# US 8,541,105 B2 · Transparent substrates with dielectric layer having a marking below the surface of the transparent substrate

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- Number: US 8,541,105 B2
- Document ID: US8541105B2
- Status: Granted
- Kind: B2
- Application number: 11/465,591
- Filed: 2006-08-18
- Published: 2007-03-15
- Granted: 2013-09-24
- Earliest claimed: 2005-08-18
- Assignees: Oerlikon Trading AG, Trubbach
- Applicants: Philipp Smole; Michael Lanker; Claus Heine-Kempkens
- Inventors: Philipp Smole; Michael Lanker; Claus Heine-Kempkens
- Web page: https://patentgrep.com/patent/US8541105B2

## CPC

- C03C 17/34: with at least two coatings having different compositions (C03C17/44 takes precedence)
- B41M 5/24: Ablative recording, e.g. by burning marks; Spark recording {(marking by high energetic means, e.g. by laser otherwise than burning or ablative removal B41M5/26; materials or methods for recording or reproduction by optical means G11B7/00)}
- B41M 5/26: Thermography (B41M5/20, B41M5/24 take precedence); {Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used (B23K takes precedence; thermographic or photothermographic systems using noble metal compounds G03C1/494)}
- B44F 1/06: produced by transmitted light, e.g. transparencies, imitations of glass paintings
- C03C 23/0015: {by visible light}
- C03C 23/0025: {by a laser beam}
- B41M 5/262: {recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics (marking of plastic artifacts with inorganic additives B41M5/267)}
- Y10T 428/24777: Edge feature
- Y10T 428/24802: Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- B44F: SPECIAL DESIGNS OR PICTURES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention concerns a method of producing subsurface marking in a transparent body. According to the invention, the marking is done less than 500 μm below the surface by applying a layer system with a high destruction threshold, compared to the substrate, to the surface of the substrate. If the layer system is designed as an anti-reflection coating system for the reading wavelength, it increases the contrast for reading. If the layer system is designed as a mirror for the writing wavelength, the writing can be done in reflection at a lower intensity.

## Claims

### Claim 1

A device comprising:
a transparent substrate;
a dielectric layer system that includes at least one dielectric layer defining a border area at a surface of the substrate; and
a laser-induced marking below the surface of the substrate at the border area,
wherein at least part of the laser-induced marking is within 500 μm of the surface and does not reach the border area, and
wherein a material for the dielectric layer system has a higher destruction threshold compared to a material of the transparent substrate for at least one wavelength in the visible region, which has been used to mark the transparent substrate to form the laser induced marking.

### Claim 2 (depends on 1)

The device in claim 1, wherein the dielectric layer system is designed as an anti-reflection coating for at least one wavelength suitable for reading the laser-induced marking.

### Claim 3 (depends on 1)

The device in claim 1, wherein the dielectric layer system is designed as a mirror layer for the at least one wavelength in the visible range.