Browse Prior Art Database

Parabolic Light Emitting Diode Lens

IP.com Disclosure Number: IPCOM000120925D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

White, GM: AUTHOR

Abstract

A parabolic lens made from transparent material for transmitting light from a source inside of an opaque cover to outside the opaque cover is described.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 85% of the total text.

Parabolic Light Emitting Diode Lens

      A parabolic lens made from transparent material for
transmitting light from a source inside of an opaque cover to outside
the opaque cover is described.

      In a typical desk-top computer there is a requirement for
several light emitting diodes (LED's) such as power on, or when a
hard disc drive is reading.  To transmit the light from the LED to
the front bezel of the machine, a small acrylic lens is utilized.
This disclosure presents an improvement on the lens used thus far.
Typically, a flat surface has been used for the lens to transmit the
light from the LED.  However, this is not the ideal shape for light
transmission.  Instead, a parabolic surface would be optimal in that
it spreads the light out over a greater area.  Several examples of
this already exist.  For example, car headlights are parabolic as are
camera lens.

      The parabolic LED lens disclosed herein is shown in the
drawings.  Fig. 1 is a side view of the lens and LED light source
showing the parabolic lens surface.  Fig. 2 is an isometric view of
the lens mounting device with lens in place.  The lens is placed in a
hole in a cover assembly in front of a LED package.  It is used to
transmit light from the LED and to concentrate this light in a manner
favorable to its perception by a system operator.  The rear surface
of the lens has the shape of a parabaloid of revolution, which is
used to concentrate light from the LED package by means...