Browse Prior Art Database

Laser Diode/Collimator Assembly

IP.com Disclosure Number: IPCOM000100925D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Luecke, F: AUTHOR

Abstract

Disclosed is a diode laser/collimator lens assembly which facilitates proper alignment and fastening in all required degrees of freedom, with a minimum number of parts and manufacturing steps.

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This is the abbreviated version, containing approximately 82% of the total text.

Laser Diode/Collimator Assembly

       Disclosed is a diode laser/collimator lens assembly which
facilitates proper alignment and fastening in all required degrees of
freedom, with a minimum number of parts and manufacturing steps.

      During assembly, adjustment of the laser with respect to the
lens may be required in up to five degrees of freedom:  X and Y
(lateral motion),  Z (focus), and Theta's X and Y (tilts).  After
assembly, the unit must remain stable and sealed under variations of
temperature and humidity, vibration etc.

      As shown in the figure, a laser diode is mounted on a base
which has, in addition to the usual chip-mounting and termination
features, three slight protrusions sharing a common spherical radius.
The collimator lens is mounted in a lens barrel having similar
spherically radiused bumps.  A round tube whose inner diameter
matches the spherical radii on the laser base and collimator lens
barrel then connects those two parts.  Part tolerances are
established such that there is a slight preload at each contact point
to eliminate play, while the intermittent peripheral clearance allows
the tube to flex sufficiently to avoid excessive friction at the
contact areas, thus permitting movement for alignment.  The movement
and sensing required for alignment is done by manufacturing tooling
(not shown).

      Once the parts are properly aligned they are fastened together
at the six contact points, for example, by laser spot wel...