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K-Mirror Alignment Procedure

IP.com Disclosure Number: IPCOM000099325D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14

Publishing Venue

IBM

Related People

Hall, RR: AUTHOR [+2]

Abstract

Photo tracing machines (PTMs) generate glass used in the photolithographic imaging of circuit and land patterns on printed circuit boards. To accurate lines and patterns, the PTM must be aligned. This is done by orienting the land and circuit lines at various angles to one another, a optical assembly which rotates the land patterns circuit lines. The optical assembly rotates a circuit image about its center as it is projected onto a This rotation must be done in a manner that the positional error of the image; errors are as the optical centerline is offset from the mirror mechanical centerline. The alignment procedure as follows:

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K-Mirror Alignment Procedure

       Photo tracing machines (PTMs) generate glass used in the
photolithographic imaging of circuit and land patterns on printed
circuit boards.  To accurate lines and patterns, the PTM must be
aligned.  This is done by orienting the land and circuit lines at
various angles to one another, a optical assembly which rotates the
land patterns circuit lines.  The optical assembly rotates a circuit
image about its center as it is projected onto a  This rotation must
be done in a manner that the positional error of the image; errors
are as the optical centerline is offset from the mirror mechanical
centerline.  The alignment procedure as follows:

      Remove the K-Mirror assembly unit from the PTM.  Before begins
care should be taken not to touch the surface as it is extremely
sensitive (Fig. 2).  Begin the K-Mirror by removing the top cover
plate, ring cover and the top half of encoder bracket.  Then remove
the encoder disk consisting of glass disk and its mounting

      Gently remove the K-Mirror prism 1 (Fig. 1) with its hardware.
Loosen mounting block 2 (Fig. 4) and the K-Mirror and accompanying
hardware from the  Then remove mounting ring (not shown) with spacers
3 attached.  Remove the K-Mirror base from the assembly base 5 (Fig.
2) with the plano still mounted to the base.

      A plano mirror 4 (Fig. 2) is mounted so that its front is
perpendicular to the K-Mirror housing's base 5.  An  shown) is
required to achieve a squareness within one of arc to the housing's
base 5.  Using the surface top surface as the reference plane, align
an parallel to this plane within one second of  The autocollimator
should be at such height that its passes through the mounting hole in
the housing where K-Mirror prism has just been removed.  The mounting
of the housing where the plano mirror bracket is is parallel to the
granite surface plate (not

      With the optical path of the autocollimator passing the hole in
the housing, reflect the beam off of the mirror's front surface.
Note the vertical angular from perpendicularity that the plano mirror
 Horizontal deviations may be corrected by to plano mirror
adjustment.  Lap the bottom of the mirror bracket and recheck for
squareness until the is more than one second of arc.  Torque all
three mounting (not shown) to 6 in. lbs., equally, to prevent
movement of the mirror.  Having squared the plano to the bottom
surface of the K-Mirror housing, this is now ready to be mounted on
the air bearing

      Before assembling the K-Mirror optics on the air bearing 6
(Fig. 1), the runout of the spindle should be  Install the three
adjustable legs 24 (Fig. 1) to bottom of the interferometer block 25
(Fig. 1).  Using electronic indicator, adjust the three legs until
the surface on top of the interferometer block is to the granite
surface plate within 0.0001 inch. in air at 55 psi @ 3.5 - 4.0 CFH
through the spindle supply port on the front of t...