Covert marking
US-2021383177-A1 · Dec 9, 2021 · US
Ultrashort laser micro-texture printing
US8995029B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8995029-B2 |
| Application number | US-201414198434-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 5, 2014 |
| Priority date | Jan 23, 2007 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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- Title
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Abstract
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Systems and methods for providing laser texturing of solid substrates are disclosed. The texturing may be used to provide grayscale images obtainable from substrates, which may include steel, aluminum, glass, and silicon. In some embodiments, images may be obtainable from the substrate by modifying the reflective, diffractive, and/or absorptive features of the substrate or the substrate surface by forming random, periodic, and/or semi-periodic micro-structure features on the substrate (or substrate surface) by an ultrafast laser pulse train. The ultrafast pulse train may be modulated in order to vary, for example, optical exposure time, pulse train intensity, laser polarization, laser wavelength, or a combination of the aforementioned. The ultrafast pulse train and the substrate may be scanned with respect to each other to provide different optical energies to different regions of the substrate (or substrate surface). In some embodiments, the image is provided by making one or more passes of the ultrafast laser pulse train relative to the substrate.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of modifying a medium so that a grayscale image is obtainable from the medium, the method comprising: providing a medium having a surface; scanning a laser beam relative to the surface, the laser beam comprising a plurality of optical pulses having a pulse width less than about 100 picoseconds, the laser beam delivering optical energy to the surface of the medium; and varying the optical energy delivered to different regions of the surface of th…
Assignees
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Classifications
- G06K15/1209Primary
Physics · mapped topic
Operations & Transport · mapped topic
Electricity · mapped topic
Physics · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8995029B2 cover?
- Systems and methods for providing laser texturing of solid substrates are disclosed. The texturing may be used to provide grayscale images obtainable from substrates, which may include steel, aluminum, glass, and silicon. In some embodiments, images may be obtainable from the substrate by modifying the reflective, diffractive, and/or absorptive features of the substrate or the substrate surface…
- Who is the assignee on this patent?
- Imra America Inc
- What technology area does this patent fall under?
- Primary CPC classification G06K15/1209. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).