Laser-colored sapphire material

Patent metadata

Field	Value
Publication number	US-10464843-B2
Application number	US-201715421466-A
Country	US
Kind code	B2
Filing date	Feb 1, 2017
Priority date	Sep 10, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A colored sapphire material and methods for coloring sapphire material using lasers are disclosed. The method for coloring the sapphire material may include positioning the sapphire material over an opaque substrate material, exposing the opaque substrate material to a laser beam passing through the sapphire material to impact the substrate material, and inducing a chemical change in a portion of the sapphire material exposed to the laser beam. The method may also include creating a visible color in the portion of the sapphire material as a result of the chemical change. The colored sapphire material may include a first transparent portion, and a second, colored portion substantially surrounded by the first portion. The second, colored portion may have a chemical composition different than that of the first portion.

First claim

What is claimed is:

1. A method of coloring a sapphire material, comprising:
passing a laser beam through the sapphire material and an opaque substrate material abutting the sapphire material; and
forming a colored region within a portion of the sapphire material exposed to the laser beam using atoms of the opaque substrate material.

2. The method of claim 1 , wherein forming the colored region comprises inducing a chemical change in the portion of the sapphire material exposed to the laser beam.

3. The method of claim 2 , wherein inducing the chemical change comprises moving atoms of the opaque substrate material into the sapphire material.

4. The method of claim 1 , wherein passing the laser beam excites atoms of the opaque substrate material.

5. The method of claim 4 , wherein forming the colored region comprises embedding the excited atoms of the opaque substrate material into the sapphire material.

6. The method of claim 1 , wherein the colored region is optically distinct from a remainder of the sapphire material that is unexposed to the laser beam.

7. The method of claim 1 , wherein:
the sapphire material is substantially transparent; and
the colored region is substantially translucent.

8. The method of claim 1 , wherein:
the sapphire material and the opaque substrate material abut along an interface surface; and
the colored region is formed along the interface surface.

9. The method of claim 8 , wherein atoms of the opaque substrate material alter the sapphire material at the interface surface in response to the exposure from the laser beam.

10. The method of claim 1 , wherein the colored region contains a visible color formed within the sapphire material based on at least one of:
a material composition of the opaque substrate material; and
an operational parameter of the laser beam.

Assignees

• Apple Inc

Inventors

• Li Michael M
• Fagan Christopher R
• Prasad Anubhav

Classifications

• B01J2219/12

  Processes employing electromagnetic waves · CPC title

• B01J19/121 Primary

  Coherent waves, e.g. laser beams (lasers per se H01S3/00) · CPC title

• B23K26/50

  Working by transmitting the laser beam through or within the workpiece · CPC title

• C03C23/0025 Primary

  by a laser beam · CPC title

• B01J2219/0879

  Solid · CPC title