Browse Prior Art Database

Vidicon Alignment Technique

IP.com Disclosure Number: IPCOM000076788D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 50K

Publishing Venue

IBM

Related People

Kern, RW: AUTHOR

Abstract

This technique is useful for aligning a vidicon tube target relative to a mounting frame.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Vidicon Alignment Technique

This technique is useful for aligning a vidicon tube target relative to a mounting frame.

Reference indicia 1 are provided on the front surface 2a of a vidicon mounting frame 2. Optical apparatus 10 is mounted to an x, y, z positioning table
7. It has microscope and autocollimator operational modes. With system 10 in the microscope mode, it is first adjusted along the x and y directions for each of the indicia 1 and their respective x and y displacements are measured by the calibrator, not shown, associated with table 7. The measurements are used to calculate the center of the plane Po which is coplanar with the surface 2a. Apparatus 10 is then adjusted in the x and y directions to be in alignment with the calculated center of plane Po.

Plane P1 represents a predetermined image plane for the vidicon tube's target T and is a known distance d from plane Po. Apparatus 10 is next moved in the appropriate z-axis direction an equivalent distance d.

Next, an image of reticle 4 is projected on the plane P1 and with is next moved in the appropriate z-axis direction an equivalent distance d.

Next, an image of reticle 4 is projected on the plane P1 and with the vidicon tube V inserted in the frame 2, the vidicon is adjusted i.e. moved, along the z axis until it is in sharp focus. This can be done by optical observance through the eyepiece 5. Preferably, the vidicon is operating and scanning the reticle 4 image at P1. The output of the vidicon is fed to a suitable waveform analyzer, not shown, such as for example a cathode ray tube (CRT) display. The vidicon is adjusted in the z direction until the amplitude of the waveform is at a maximum,
i.e. the reticle image on the tube's target T is in optimum focus.

Next, corrections are made for any noncoplanar misalignment between the plane of the vidicon target and the plane Pl about the pi...