Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1987-07-20
1989-07-18
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Detailed holder for original
355 46, G03B 2762
Patent
active
048497940
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 image 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: 3826571 (1974-07-01), Spence-Bate
patent: 3851968 (1974-12-01), Hoffman et al.
patent: 3871009 (1975-03-01), Steinbatz et al.
patent: 4444490 (1984-04-01), Stark et al.
patent: 4583845 (1986-04-01), Lucht et al.
patent: 4603968 (1986-08-01), Schmidt
patent: 4737825 (1988-04-01), Davis
Greene Arnold H.
Holden Harold E.
Hayes Monroe H.
Micro-Radiographs, Inc.
LandOfFree
High precision photoreduction process and related apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High precision photoreduction process and related apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High precision photoreduction process and related apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-175638