Optical: systems and elements – Diffraction – From zone plate
Reexamination Certificate
2006-01-17
2006-01-17
Robinson, Mark A. (Department: 2872)
Optical: systems and elements
Diffraction
From zone plate
C257S098000
Reexamination Certificate
active
06987613
ABSTRACT:
Provided is a light emitting device including a Fresnel lens and/or a holographic diffuser formed on a surface of a semiconductor light emitter for improved light extraction, and a method for forming such light emitting device. Also provided is a light emitting device including an optical element stamped on a surface for improved light extraction and the stamping method used to form such device. An optical element formed on the surface of a semiconductor light emitter reduces reflective loss and loss due to total internal reflection, thereby improving light extraction efficiency. A Fresnel lens or a holographic diffuser may be formed on a surface by wet chemical etching or dry etching techniques, such as plasma etching, reactive ion etching, and chemically-assisted ion beam etching, optionally in conjunction with a lithographic technique. In addition, a Fresnel lens or a holographic diffuser may be milled, scribed, or ablated into the surface. Stamping, an alternative method for forming an optical element, can also be used to form a Fresnel lens or a holographic diffuser on the surface of a semiconductor light emitter. Stamping includes pressing a stamping block against the surface of a light emitting diode. The stamping block has a shape and pattern that are the inverse of the desired optical element. Optionally, stamping can be done before, after, or concurrently with wafer-bonding. Alternatively, a material can be stamped and later bonded to the semiconductor light emitter.
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Camras Michael D.
Hofler Gloria E.
Pocius Douglas W.
Amari Alessandro
Lumileds Lighting U.S. LLC
Patent Law Group LLP
Robinson Mark A.
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