Method for producing a semiconductor light emitting device
US5403773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Jul 9, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/855
Abstract
A surface emitting type of light emitting devices has a narrow emanating region near the front surface. A spherical lens is fixed on the front surface or rear surface for converging light beams to a core of an optical fiber. Prior devices determined the position of the spherical lens by forming a concavity or a set of protrusions on the rear surface. Two wafer processes were required to form the concavity or protrusions. Two wafer processes on both surfaces induced not a little positioning error. This invention does not form concavities nor protrusions on the rear surface. The rear surface is ground and left flat. Second electrode is formed on the rear surface, not hindering light to emit through. The center of the emanating region is determined by supplying current to the device and illuminating the emanating region. The emanating pattern is observed by a TV camera connected to a computer. The center of the emanating region is detected by image processing of the illuminated pattern. The position of the center is memorized. Adhesive is supplied to the rear surface of the chip. A spherical lens is carried to a spot of the memorized coordinate. The adhesive is hardened in a moment to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.