# US 7,744,964 B2 · Vacuum roll coated security thin film interference products with overt and/or covert patterned layers

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- Number: US 7,744,964 B2
- Document ID: US7744964B2
- Status: Granted
- Kind: B2
- Application number: 11/765,904
- Filed: 2007-06-20
- Published: 2007-11-29
- Granted: 2010-06-29
- Earliest claimed: 2003-07-14
- Assignees: JDS Uniphase Corporation
- Inventors: Roger W. Phillips; Keith Hollingsworth; Vladimir P. Raksha
- Web page: https://patentgrep.com/patent/US7744964B2

## CPC

- G02B 5/18: Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)}
- B42D 25/328: Diffraction gratings; Holograms
- B42D 25/355: Security threads
- B42D 25/369: Magnetised or magnetisable materials
- D21H 21/42: Ribbons or strips (filaments D21H15/06)
- B42D 2035/24
- D21H 21/44: Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
- D21H 21/48: Elements suited for physical verification, e.g. by irradiation
- Y10T 428/24917: including metal layer
- Y10T 428/2933: Coated or with bond, impregnation or core
- Y10T 428/2938: Coating on discrete and individual rods, strands or filaments
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for forming an optically variable device upon a substrate comprises the steps of: patterning a reflective layer on the substrate using an oil-ablation technique; removing oil residue from the first side of the substrate using a first glow discharge; and depositing thin-film layers so as to be supported by the substrate to form the optically variable device. Optionally, oil residue is removed from the second side of the substrate using a second glow discharge.

## Claims

### Claim 1

A method for forming an optically variable device upon a substrate having a first side and a second side, the method comprising the steps of: patterning a reflective layer on the substrate using an oil-ablation technique, wherein an oil is applied to selected portions of the substrate; removing oil residue from the first side of the substrate using a first glow discharge, wherein the first glow discharge is formed from a precursor comprising oxygen; depositing thin-film layers so as to be supported by the substrate to form the optically variable device; and removing oil residue from the second side of the substrate using a second glow discharge, wherein only the first side of the substrate has been oil patterned, by application of oil to selected portions of the substrate and the oil residue results from the step of patterning the reflective layer on the first side of the substrate.

### Claim 2 (depends on 1)

A method as defined in claim 1, wherein the step of patterning the reflective layer is performed on the first side of the substrate, and wherein the thin-film layers are deposited on the first side of the substrate over the patterned reflective layer.

### Claim 3 (depends on 2)

The method of claim 2, further comprising the step of depositing an optical structure over the thin-film layers.

### Claim 4 (depends on 2)

The method of claim 2, further comprising the step of depositing an optical structure on the second side of the substrate.

### Claim 5 (depends on 2)

The method of claim 2, wherein the second glow discharge is formed from a precursor comprising oxygen.

### Claim 6 (depends on 1)

The method of claim 1, wherein the second glow discharge is formed from a precursor comprising oxygen.

### Claim 7 (depends on 1)

The method of claim 1, wherein the oil ablation technique includes the step of applying oil in a pattern with an ink jet device.