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Browse Prior Art Database

Optical Height-Adjust

IP.com Disclosure Number: IPCOM000102774D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Ulrich, SD: AUTHOR [+2]

Abstract

The figure illustrates a precision automated "non-contact" technique for performing a height adjustment to a datum surface. The height adjustment technique comprises the following building block elements. 1. Adjustable table (up and down) with lead screw 2. Stepper motor 3. Stepper motor amplifier 4. Photodetector pair 5. Micro processor and software/program 6. Schmitt trigger amplifier 7. Aperture cap

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This is the abbreviated version, containing approximately 100% of the total text.

Optical Height-Adjust

      The figure illustrates a precision automated "non-contact"
technique for performing a height adjustment to a datum surface.  The
height adjustment technique comprises the following building block
elements.
      1.  Adjustable table (up and down) with lead screw
      2.  Stepper motor
      3.  Stepper motor amplifier
      4.  Photodetector pair
      5.  Micro processor and software/program
      6.  Schmitt trigger amplifier
      7.  Aperture cap

      The height adjustment sequence is as follows:  An object 9 to
be height adjusted is placed on an adjustable table 1 below a
photodetector pair 4 (beam not broken).  A table 1 is raised using a
micro processor controlled stepper motor 2 until the photodetector
pair experiences transition (beam is broken).  The transition
disables an "AND Follower" 10, and therefore, stops clocking pulses
to stepper motor 2. This point is the intrinsic threshold of
photodetector pair 4 and a Schmitt trigger amplifier 6.
Photodetector pair 4 should be set such that the intrinsic threshold
coincides with the datum surfaced; the object is now correctly height
adjusted.  The table is reset (lowered) for the next height
adjustment, and the sequence begins again.

      Disclosed anonymously.