THIN LED FLASH FOR CAMERA

摘要

A thin flash module for a camera uses a flexible circuit as a support surface. A blue GaN-based flip chip LED die is mounted on the flex circuit. The LED die has a thick transparent substrate forming a “top” exit window so at least 40% of the light emitted from the die is side light. A phosphor layer conformally coats the die and a top surface of the flex circuit. A stamped reflector having a knife edge rectangular opening surrounds the die. Curved surfaces extending from the opening reflect the light from the side surfaces to form a generally rectangular beam. A generally rectangular lens is affixed to the top of the reflector. The lens has a generally rectangular convex surface extending toward the die, wherein a beam of light emitted from the lens has a generally rectangular shape corresponding to an aspect ratio of the camera's field of view.

主权项

1. A light emitting device comprising:
a support structure; a light emitting diode (LED) die mounted on the support structure, the LED die having a top surface and side surfaces, the LED die comprising LED semiconductor layers and a transparent substrate, the substrate comprising the top surface of the LED die so that the LED die is a flip-chip, wherein the side surfaces comprise a combination of sides of the LED semiconductor layers and sides of the substrate, the substrate being thicker than the LED semiconductor layers, wherein light emitted from the side surfaces is at least 30% of all light emitted by the LED; a phosphor layer covering the top surface and side surfaces; a reflector surrounding the LED die, the reflector having curved surfaces surrounding the LED die and having a non-convex surface facing away from the LED die, wherein the curved surfaces extend from a generally rectangular opening for the LED die and reflect the light from the side surfaces of the LED die to form a generally rectangular beam; and a generally rectangular lens affixed to walls of the reflector, the lens having a generally rectangular convex surface extending toward the LED die, wherein a beam of light emitted from the lens has a generally rectangular shape.