Patent
1989-02-07
1991-06-18
Henry, Jon W.
350507, G02B 2120, G02B 2702, G02B 2734
Patent
active
050245120
ABSTRACT:
A process for high resolution high accuracy photoreduction of radiographs, a rotatable photographic copy stand for the photoreduction process, and a high resolution high accuracy microfilm reader with built-in measuring capabilities are shown. The photoreduction process employs a camera with high precision optics, a high resolution copy film, and a first developing solution containing 0.014 to 0.025 moles per liter of a 3-pyrazolidone as the primary developing agent plus a lesser amount of a secondary developing agent, in a reversal process, to yield positive images having gamma values of 1.00 to 1.05. The copy stand has multiple workstations mounted on a rotatable frame, and several lightboxes. The microfilm reader employs high precision optics throughout, and possesses a variable magnification objective lens, a beam splitter, ultrawide-angle eyepieces, and a movable measuring reticle, the image of which is superimposed upon the image from the objective lens for accurate measurement of features shown on a film being examined. By means of the disclosed process and apparatus, industrial radiographs or other sorts of X-rays are photoreduced and later reenlarged for reexamination and measurement of selected features, with an overall dimensional accuracy of at least 99.9%.
REFERENCES:
patent: Re29194 (1977-04-01), Ambrose et al.
patent: 352639 (1886-11-01), Allen
patent: 1939161 (1933-12-01), Bestelmeyer
patent: 1974606 (1934-09-01), Fassin
patent: 2123882 (1938-07-01), Draeger
patent: 2143632 (1939-01-01), Ott
patent: 2674152 (1954-04-01), Wilkinson
patent: 2882790 (1959-04-01), Broms
patent: 3228283 (1966-01-01), Fulton et al.
patent: 3270652 (1966-09-01), Mason et al.
patent: 3373440 (1968-03-01), Jenkins et al.
patent: 3376762 (1968-04-01), Brault
patent: 3398631 (1968-08-01), McGivern et al.
patent: 3401999 (1968-09-01), Kephart et al.
patent: 3442588 (1969-05-01), Squassoni et al.
patent: 3472585 (1969-10-01), Halberg et al.
patent: 3531197 (1970-09-01), King
patent: 3565534 (1971-02-01), Chaban
patent: 3575098 (1971-04-01), Jones
patent: 3616737 (1971-11-01), Foslien
patent: 3762797 (1923-10-01), Heller
patent: 3807846 (1974-04-01), Swank
patent: 3865477 (1975-02-01), Gast
patent: 3917398 (1975-11-01), Takahashi et al.
patent: 3981575 (1976-09-01), Tanaka et al.
patent: 4017147 (1977-04-01), Weber et al.
patent: 4026631 (1977-05-01), Erb
patent: 4027942 (1977-06-01), Fukushige
patent: 4043662 (1977-08-01), Garfall
patent: 4077716 (1978-03-01), Gandini
patent: 4080056 (1978-03-01), Jesensky et al.
patent: 4100591 (1978-07-01), Schael
patent: 4128332 (1978-12-01), Rowe
patent: 4139387 (1979-02-01), Von Konig et al.
patent: 4220982 (1980-09-01), Martino
patent: 4225923 (1980-09-01), Bloemendaal et al.
patent: 4241392 (1980-12-01), Boone
patent: 4250358 (1981-02-01), Gilbertson
patent: 4313605 (1982-02-01), Stokes et al.
patent: 4334763 (1982-06-01), Honda et al.
patent: 4387985 (1983-06-01), Magin et al.
patent: 4515455 (1985-05-01), Northmore
patent: 4523094 (1985-06-01), Rossow
patent: 4566768 (1986-01-01), Bosdet
patent: 4568179 (1986-02-01), Durbin et al.
Research Disclosure, No. 161, Sep. 1977, pp. 26-27, "Reversal Processing of Silver Halide Color Photographic Materials".
Greene Arnold H.
Holden Harold E.
American Photo Systems, Inc.
Henry Jon W.
LandOfFree
Microfilm reader with microfilm and reticle images provided to e does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microfilm reader with microfilm and reticle images provided to e, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microfilm reader with microfilm and reticle images provided to e will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-142586