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SMALL FOCAL LENGTH OPTICS SIMPLIFIED

IP.com Disclosure Number: IPCOM000202485D
Publication Date: 2010-Dec-17
Document File: 9 page(s) / 689K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique to achieve light patterns on the ground is disclosed. The technique uses small focal length optics and an array of extruded type surface geometry to get various optical patterns on the ground. The technique achieves a light pattern on the ground by placing the extruded surface perpendicular to the place where light on the ground is needed.

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SMALL FOCAL LENGTH OPTICS SIMPLIFIED

BRIEF ABSTRACT

A technique to achieve light patterns on the ground is disclosed.  The technique uses small focal length optics and an array of extruded type surface geometry to get various optical patterns on the ground.    The technique achieves a light pattern on the ground by placing the extruded surface perpendicular to the place where light on the ground is needed.

KEYWORDS

Light patterns, light sources, LED, optics, focal length, extruded surface, optical pattern, optical system, reflector, refractor, fabrication, extrusion

DETAILED DESCRIPTION

LED and other small light center sources are starting to become more widely available for light sources.  Generally, light sources emit light in a spherical pattern.  Light emitting diodes (LEDs) are unique in that they emit light into a hemispherical pattern.  Therefore, to utilize an LED as a light source in a conventional manner, reflectors are placed around an LED.  Patterns are formed on one or more interfaces of the device (e.g., the emission surface).  In some embodiments, the patterns may be positioned such that light generated by the device passes through the patterns when being emitted.  As described further below, the patterns can be defined by a series of features (e.g., vias, posts) having certain characteristics (e.g., feature size, depth, nearest neighbor distances) which may be controlled to influence properties of the light emitted from the device including improving extraction and/or collimation of the emitted light.  Hence, the shape of the optical pattern for putting various light patterns on the ground, floor, wall, etc becomes important.  There needs to be some type of an array of sources that are optically controlled via some type of reflector or refractor surfaces.

Conventionally, a Round Type V and a Square Type V available from companies like Lumination.  However, these use revolved surfaces that can be difficult to fabricate.  For example separate section needs to be used for the corners.  Hence, there is an unmet need of a technique to overcome these problems at least partially, and a simple way to create varying light patterns on the ground.

The present technique provides a simpler way to achieve the light patterns on the ground with an array of light sources.  The present technique basically uses an array of extruded type surface geometry to get various light patterns on the ground.  The method of fabrication of the surface is an extrusion, small specular or diffuse sheet metal piece that are formed, basically anything that can be made in straight sections. 

In order to achieve a light pattern on the ground, the extruded surface should be perpendicular to the place where light on the ground is needed.  Type 1, 2, 3, 4 , Square Type 5 extruded surface array reflector shape examples are shown herewith. 

These are shown in the Figures below.  The grey colored parts refer to the Optic and the Brown colored parts a...