Patent US3602085A successfully refreshed from Google Patents.
US3602085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic image-focusing device
Assignee: Pentacon GmbH Foto und Feinwerktechnik
•
Filing: 1968-06-17
•
Granted: 1971-08-31
•
Expires: 1988-06-17
Abstract
Abstract An image-focusing plate for cameras comprises two or four parts formed from wedge prisms arranged to form an image-intersection line which is displaced along its length through an angle not exceeding 100* or intersects another image intersection line at an angle gamma not exceeding 100*. The image-intersection line or lines where they intersect a center of symmetry of the plate are at an angle Beta smaller than 46* relative to an end of maximum cross-sectional area of a wedge from which a part is formed.
Inventors
- 👤 Kurt Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:16
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
204 words
An image-focusing device for cameras comprising two parts formed from triangular wedge prisms, each wedge prism having a face comprising the hypotenuse of the triangle of the wedge, a first edge at the thin end of the wedge and a second edge at the end of the wedge of maximum cross-sectional area of the wedge, said second edge being parallel to said first edge, the parts being arranged reversed relative to each other so that the first edge of each wedge is adjacent and parallel to the second edge of the other wedge, wherein between the parts there is provided an image-intersection line which extends from a position adjacent one end of the second edge of one prism to the corresponding position adjacent the corresponding end of the second edge of the other prism, the image-intersection line having a first part passing through a center of symmetry which is midway between the ends of the image-intersection line, wherein the included angle between said first part and the second edges of said prisms is less than 46*, the image-intersection line also having a second part spaced from said first part and which is displaced through an angle no greater than 100* from said first part.
Claim 2
Dependent Claim
204 words
An image-focusing device for cameras comprising two parts formed from triangular wedge prisms, each wedge prism having a face comprising the hypotenuse of the triangle of the wedge, a first edge at the thin end of the wedge and a second edge at the end of the wedge of maximum cross-sectional area of the wedge, said second edge being parallel to said first edge, the parts being arranged reversed relative to each other so that the first edge of each wedge is adjacent and parallel to the second edge of the other wedge, wherein between the parts there is provided an image-intersection line which extends from a position adjacent one end of the second edge of one prism to the corresponding position adjacent the corresponding end of the second edge of the other prism, the image-intersection line having a first part passing through a center of symmetry which is midway between the ends of the image-intersection line, wherein the included angle between said first part and the second edges of said prisms is less than 46*, the image-intersection line also having a second part spaced from said first part and which is displaced through an angle no greater than 100* from said first part.
Claim 3
Dependent Claim
40 words
An image-focusing plate according to claim 1, wherein the image-intersection line comprises curvatures along its length other than at its midpoint, the tangents of said curvatures intersecting said second edges of the wedges at an angle of at most 90*.
Claim 4
Dependent Claim
198 words
An image-focusing device for cameras comprising four parts formed from triangular wedge prisms, each wedge prism having a face comprising the hypotenuse of the triangle of the wedge, a first edge at the thin end of the wedge and a second edge at the end of the wedge of maximum cross-sectional area of the wedge and parallel to said first edge, the parts being arranged in pairs having two parts reversed relative to each other so that the first edge of each wedge of a pair of parts is adjacent and parallel to the second edge of the other wedge of the pair of parts, said adjacent and parallel edges of the wedges of one pair of parts being arranged perpendicularly to said adjacent and parallel edges of the other pair of parts so that in plan view the four parts each form a triangle and together form a rectangle having one image-intersection line which extends from one corner of the rectangle to the opposite corner thereof and passes through the center of the rectangle, and a second image-intersection line which extends through the other two corners of the rectangle and passes through the center of the rectangle.
Claim 5
Dependent Claim
198 words
An image-focusing device for cameras comprising four parts formed from triangular wedge prisms, each wedge prism having a face comprising the hypotenuse of the triangle of the wedge, a first edge at the thin end of the wedge and a second edge at the end of the wedge of maximum cross-sectional area of the wedge and parallel to said first edge, the parts being arranged in pairs having two parts reversed relative to each other so that the first edge of each wedge of a pair of parts is adjacent and parallel to the second edge of the other wedge of the pair of parts, said adjacent and parallel edges of the wedges of one pair of parts being arranged perpendicularly to said adjacent and parallel edges of the other pair of parts so that in plan view the four parts each form a triangle and together form a rectangle having one image-intersection line which extends from one corner of the rectangle to the opposite corner thereof and passes through the center of the rectangle, and a second image-intersection line which extends through the other two corners of the rectangle and passes through the center of the rectangle.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |