Optical instrument employing a truncated prism having its distal

Details Optical instrument employing a truncated prism having its distal Optical instrument employing a truncated prism having its distal

1976-06-28

1978-01-24

Sacher, Paul A.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 96T, 350286, 356241, G02B 1306, G01N 2100

Patent

active

040700909

ABSTRACT:
An optical instrument for use in examining the internal wall of an aperture in a work material comprising a generally tubular housing formed from a material that is opaque to light and having a central axis and first and second ends, the first end having an annular surface that lies in a plane substantially normal to the central axis, a light directing member formed from a transparent material and having a shape in the form of an elongated frustum of a right rectangular pyramid, the member having a longitudinal axis that is coincident with the central axis, a third end having a first rectangular dimension, a fourth end having a second rectangular dimension that is larger than the first dimension, and four faces extending between the third and fourth ends, each face being capable of internally reflecting light passing through the member and incident on the face, the member being mounted within the housing intermediate the first and second ends such that the third end terminates within the housing proximate the first end, and a pair of lenses mounted within the housing between the fourth end and the second end for focusing and magnifying an image formed by the light passing through the member, whereby when the first end is placed against the work material with the axes in substantial alignment with the center of the aperture, and the second end is placed in front of the eye of a viewer, ambient light reflected off the internal wall passes through the third end and is reflected internally by the faces so as to provide images representative of corresponding portions of the internal wall, and whereby the lenses serve to focus and magnify the images so as to permit the viewer to observe the physical appearance of the internal wall.

REFERENCES:
patent: 1804105 (1931-05-01), Martens
patent: 2036622 (1936-04-01), Emmerich
patent: 2932294 (1960-04-01), Fourestier et al.
patent: 3357433 (1967-12-01), Fourestier et al.
patent: 3439157 (1969-04-01), Myles
patent: 3467840 (1969-09-01), Weiner
patent: 3922097 (1975-11-01), Machet
McGroddy, J. C., "Thermal Conversion of Solar Energy," IBM Tech. Disc. Bull., vol. 18, 9-1975, pp. 1214-1215.
Titan, "Titan Zoom-A-Bore," advertisement from Titan Tool Supply Co., 68 Comet Ave., P.O. Box 1682, Buffalo, N.Y. 14216.

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