Patent US3695769A successfully refreshed from Google Patents.
US3695769A
Expired / Lapsed
US
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Optical comparators
Assignee: Wickman Machine Tool Sales Ltd
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Filing: 1971-01-12
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Granted: 1972-10-03
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Expires: 1991-01-12
Abstract
Abstract An optical comparator having workpiece support and a platform on which an enlarged layout of a profile can be laid and optical elements for reducing the image and causing it to coincide with an image of the workpiece itself, both the images being visible at the same scale through a microscope of the machine.
Inventors
- 👤 Peter Alan Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:24
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
An optical comparator comprising, in combination, a workpiece support, a platform for supporting an enlarged layout of a profile for comparison with a profiled workpiece, a microscope including an objective lens positioned along an optical axis for viewing the workpiece, and optical elements including means whereby an image of the layout on the platform is reduced and including further means whereby said image is superimposed in scale upon an image of the workpiece in a plane intersecting said optical axis in front of said microscope objective lens, whereby said images are visible through the microscope, at the same magnification.
Claim 2
Dependent Claim
99 words
An optical comparator comprising, in combination, a workpiece support, a platform for supporting an enlarged layout of a profile for comparison with a profiled workpiece, a microscope including an objective lens positioned along an optical axis for viewing the workpiece, and optical elements including means whereby an image of the layout on the platform is reduced and including further means whereby said image is superimposed in scale upon an image of the workpiece in a plane intersecting said optical axis in front of said microscope objective lens, whereby said images are visible through the microscope, at the same magnification.
Claim 3
Dependent Claim
46 words
An optical comparator as claimed in claim 1 in which the said optical elements comprise a reducing lens element through which an image of the layout passes, and a prism element whereby the image is aligned with the image of a workpiece viewed by an operator.
Claim 4
Dependent Claim
24 words
An optical comparator as claimed in claim 2 in which the layout image is reflected by a mirror before passing throuGh the lens element.
Claim 5
Dependent Claim
33 words
An optical comparator as claimed in claim 2 in which the prism element includes a portion directed towards a light source from which light is reflected through the prism element towards the workpiece.
Claim 6
Dependent Claim
24 words
An optical comparator as claimed in claim 1 in which the microscope is adjustably mounted to enable the field of view to be varied.
Claim 7
Dependent Claim
23 words
An optical comparator as claimed in claim 1 in which the workpiece support is adjustably mounted upon a base of the optical comparator.
Claim 8
Dependent Claim
30 words
An optical comparator as claimed in claim 2 in which the reducing lens element is interchangeable with other reducing lens elements so that the degree of reduction can be varied.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |