Browse Prior Art Database

A SELF-ALIGNING ELECTROSTATIC-DISCHARGE-PROTECTED SURFACE-MOUNT RIGHT-ANGLE LIGHT EMITTING DIODE

IP.com Disclosure Number: IPCOM000007904D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-03
Document File: 4 page(s) / 237K

Publishing Venue

Motorola

Related People

Robert R. Kornowski: AUTHOR [+2]

Abstract

This article discloses the invention ofa light emit- ting diode type of device that solves an industry wide problem. Prior to this invention, numerous compo- nent manufacturers had attempted to address the global need for a surface-mount right-angle light emitting diode but none had succeeded in develop- ing a suitable device. The two main deficiencies of all prior devices is found in their inability to main- tain an optimum physical orientation and in their lack of provision for protection from electrostatic discharge. The invention disclosed herein addresses both of these basic needs through the incorporation of a single physical element. This invention has been prototyped and is proven to exhibit superior per- formance in actual application.

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Page 1 of 4

M-LA Technical Developments

A SELF-ALIGNING ELECTROSTATIC-DISCHARGE-PROTECTED

SURFACE-MOUNT RIGHT-ANGLE LIGHT EMITTING DIODE

by Robert R. Kornowski and Daniel R. Schroeder

prototyped and is proven to exhibit superior per- formance in actual application.

ABSTRACT

THE HISTORY OF THE PROBLEM

  '&is article discloses the invention ofa light emit- ting diode type of device that solves an industry wide problem. Prior to this invention, numerous compo- nent manufacturers had attempted to address the global need for a surface-mount right-angle light emitting diode but none had succeeded in develop- ing a suitable device. The two main deficiencies of all prior devices is found in their inability to main- tain an optimum physical orientation and in their lack of provision for protection from electrostatic discharge. The invention disclosed herein addresses both of these basic needs through the incorporation of a single physical element. This invention has been

  Electronic equipment commonly employs some form of visual status indication. The status indica- tion provision typically takes the form of a light that is viewable through a hole in the front panel of the equipment. Frequently, the circuit density of the equipment is such that the area of the circuitry exceeds the area of the front panel. This situation necessitates an architecture wherein the plane of the circuitry is oriented at a right-angle to the plane of the associated front panel (see Fig. 1).

Fig. 1 Right-Angle Front Panel

0 MMOrnla, Inc. 1996

November I996

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Page 2 of 4

MolylRoLA Technical Developments

  The common surface-mount light emitting diode The following approaches constitute the prior is constructed such that it emits its light straight up art with respect to addressing the need for a right- from (or down through a hole in) the surface of the angle viewable, surface-mount, light emitting diode circuit board to which it is attached. While this is device.
an acceptable situation for equipment architectures
wherein the plane of the front panel and plane of l Use a light-pipe to bend the light from a the circuit board are parallel to each other, it is a common surface-mount light emitting diode (see problem for equipment with right-angle related front Fig. 2).
panel and circuit board as depicted in Fig. 1.

PCS

Fig. 2 Light-Pipe Solution

  The inherent disadvantages of the right-angle greater development cost than that of a simple self- light-pipe approach are: degraded brightness, opti- contained device.
cal bleed-through from adjacent light-pipes, optical
scattering and attenuation from moisture and dirt l Incorporate a right-angle prism and a common that accumulate in the gap ofthe optical path, greater surface-mount light emitting diode into the same component cost, greater direct labor assembly cost, housing, thus creating a right-angle light emitting greater complexity and defect opportunities, and diode device (se...