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Light Emitting Diode Light Tunnel

IP.com Disclosure Number: IPCOM000106833D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 4 page(s) / 141K

Publishing Venue

IBM

Related People

Barina, RM: AUTHOR [+4]

Abstract

Described is an opaque light tunnel in which a Light Emitting Diode (LED) is mounted so as to direct all light rays being emitted, when energized, to its spherical tip where the rays in turn are directed towards a lens.

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Light Emitting Diode Light Tunnel

      Described is an opaque light tunnel in which a Light Emitting
Diode (LED) is mounted so as to direct all light rays being emitted,
when energized, to its spherical tip where the rays in turn are
directed towards a lens.

      In a computer there exists a need to indicate to the end user
when the system has been switched on and is running and that a
certain commodity such as a hardfile is working.  Other information
can be provided to inform the end user that devices such as mute
mode, stand-by mode, etc., are active.  This is conveyed to the end
user by a LED.  The LED component is usually wired to the planar and
is mounted behind a bezel or front cover.  The bezel or front cover
has a clear light pipe that carries the luminous intensity from the
LED to the outside of the system where the end user can visualize the
operation taken place by the system.

      Because of the increase in space restrictions in the new
systems and because of smaller foot print, the systems are being
designed for the increase in the Direct Access Storage Device (DASD).
Special needs and requirements to inform the end user of a certain
task being performed by the system are required.  It has become
necessary to mount the LED components closer together and imperative
to be able to direct the luminous intensity toward the front or to
the clear light pipe which will carry the light to the outside of the
system.  By locating and mounting the LEDs closer together, the light
from one LED can influence the light emitted through another clear
light pipe because of its close proximity.  This can create confusion
to the end user on the status of system or certain tasks being
performed at a given time by having luminous intensity projecting
through numerous light pipes.

      A LED will direct 70% of its relative luminous intensity at an
angular displacement of 90 degrees in the front spherical surface of
the LED component.  This leaves 30% of luminous intensity to escape
to its sides.  This 30% of luminous intensity which escapes from the
LED component sides does not enhance nor influence the amount of
light being directed to the front of the unit or to the light pipe
which carries the light to the outside of the system.  Instead this
30% of lumi...