Browse Prior Art Database

Reference Jig

IP.com Disclosure Number: IPCOM000087318D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Goetz, WE: AUTHOR [+2]

Abstract

Reference jig 10 standardizes the inter- and intra-alignments of the optical elements of four different optical units of an optical measuring system.

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Reference Jig

Reference jig 10 standardizes the inter- and intra-alignments of the optical elements of four different optical units of an optical measuring system.

Jig 10 includes reference mounting table 11, two alignment telescopes 12, and 13, autocollimator 14, and three different mirror mounts, only one mirror mount 15 being shown in Fig. 1. Table 11 has precision-located, threaded mounting pads 16 and pin-receiving bushings 17 on its upper and lower surfaces. The mounting bases of the optical reference units (not shown), the telescopes 12 and 13, autocollimator 14, and the mirror mounts have mounting pads which are seated on corresponding ones of the pads of member 11 and affixed thereto by screws 18. These same mounting bases are also equipped with pins, which are seated in corresponding ones of the bushings of table 11. Together the pads of the bases and table 11 provide vertical registration, whereas the pins of the bases and bushings of table 11 provide lateral registration.

To align the optical elements (not shown) of the first optical unit A (Fig. 2), the latter is mounted to the upper surface of table 11 between telescope 12 and a fixed position mirror 19 of one of the mirror mounts, which is also mounted to member 11. The optical axis 20 of telescope 12 is perpendicular to and aligned with the intersection of a crosshair (not shown) inscribed on the surface of mirror
19. A first series of the optical elements (not shown) of unit A are inserted, mounted and adjusted in a given sequence in unit A so as to maintain the alignment of axis 20 with the crosshair intersection.

The second optical unit B (not shown) is now mounted to the undersurface of table 11 so that its optical axis extends upwardly through the aperture 21 (Fig. 1) of table 11. The optical axis of unit B coacts with optical unit A so as to be orthogonally extended onto mirror 19 coincidentally with axis 20. A second series of optical elements (not shown) are next inserted, mounted and adjusted in unit A in a given sequence so as to maintain the coincidental alignment relationship with the crosshair intersection.

The first mirror mount is then replaced with a second mirror mount not shown) which has a mirror that is adjustable about orthogonal pitch and aximuth axes and is linearly movable in the direction of arrow 22 Fig. 2). Unit A is then calibrated with the aid of autocollimator 14 for predetermined angular positions of the mirror about its respective pitch and azimuth axes. After calibration, a third series of optical elements (not shown) are inserted...