US3572905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens hood
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1969-04-04
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Granted: 1971-03-30
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Expires: 1989-04-04
Abstract
Abstract In the tubular rear member of a lens hood is provided at least one slot extending in axial and in circumferential direction. The slot is adapted to receive a pin stationarily secured on the front portion of the objective mount, and spring means are arranged near the slot for resiliently locking the pin in the slot when the hood is mounted on the lens. The inner diameter of the tubular member corresponds to the standardized diameter of a filter series so that different filters can be inserted into the hood prior to mounting. The inner surface of the tubular member is provided with a shoulder against which the filters abut, and in one particular embodiment of the invention means for rotating the filter are incorporated.
Inventors
- 👤 Werner Schlapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
G; G03; G03B; G03B11/00; G03B11/04; G03B11/045; G03B17/00; G03B17/56; G03B17/566
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
A lens hood mounted on the cylindrical front portion (2) of an objective (1) to support a filter in front of said objective, said lens hood comprising in combination: a tubular rear member (6) having an inner diameter corresponding both to the diameter of the cylindrical front portion (2) of said objective and to the standardized diameter of a series of filters (8), and said tubular rear member being provided with a Z-shaped slot formed in the tubular wall area (12,13,14) extending in axial and in circumferential direction along said wall, said slot receiving a pin (4) positively secured to and radially projecting from said cylindrical front portion (2) of said objective (1), a first spring means (15) fixed to said tubular rear member (6) so as to extend with its resilient end across said slot (12,13,14) said first spring means engaged by said pin when said lens hood is mounted on said objective, and an abutment (9) provided at the front portion inside said tubular member, said abutment defining a cylindrical space within a filter (8) can be inserted from the rear prior to mounting said lens hood on said objective.
Claim 2
Dependent Claim
192 words
A lens hood mounted on the cylindrical front portion (2) of an objective (1) to support a filter in front of said objective, said lens hood comprising in combination: a tubular rear member (6) having an inner diameter corresponding both to the diameter of the cylindrical front portion (2) of said objective and to the standardized diameter of a series of filters (8), and said tubular rear member being provided with a Z-shaped slot formed in the tubular wall area (12,13,14) extending in axial and in circumferential direction along said wall, said slot receiving a pin (4) positively secured to and radially projecting from said cylindrical front portion (2) of said objective (1), a first spring means (15) fixed to said tubular rear member (6) so as to extend with its resilient end across said slot (12,13,14) said first spring means engaged by said pin when said lens hood is mounted on said objective, and an abutment (9) provided at the front portion inside said tubular member, said abutment defining a cylindrical space within a filter (8) can be inserted from the rear prior to mounting said lens hood on said objective.
Claim 3
Dependent Claim
76 words
A lens hood as claimed in claim 1, and further comprising a recess (20) in said branch (13) extending in the direction of the circumference, said recess extending to the rear end of the lens hood, and second spring means (21) secured to said tubular member, the resilient end of which is arranged to guide said pin (4) into said recess (20) upon movement of said pin in said circumferentially extending branch (13) in either direction.
Claim 4
Dependent Claim
53 words
A lens hood as claimed in claim 1, and further comprising a cover ring (17) to cover said tubular member on the outside and defining between said member (6) and the inner surface of said ring (17) a ring-shaped space wherein said spring means (15) and said second spring means (21) are disposed.
Claim 5
Dependent Claim
26 words
A lEns hood as claimed in claim 3, wherein the conical part (10) of the lens hood is a solid portion of said cover ring (17).
Claim 6
Dependent Claim
33 words
A lens hood as claimed in claim 3, and further comprising means to rotate said filter inside said lens hood when said lens hood when said lens hood is mounted on said objective.
Claim 7
Dependent Claim
52 words
A lens hood as claimed in claim 5, wherein said means comprises a rotatable pinion (26) displaceable in a radial slot (25a, 26b) in said tubular member (6) and said cover ring (17), and spring means (30a, 30b) to keep said pinion resiliently out of mesh with the circumference of said filter.
Claim 8
Dependent Claim
43 words
A lens hood as claimed in claim 6, wherein said pinion (26) has a shaft (31) which is journaled in a groove (28a, 28b) on the inside of said cover ring which groove extends at right angle to said radial slot (25a, 25b).
Claim 9
Dependent Claim
43 words
A lens hood as claimed in claim 6, wherein said spring means (30a, 30b) is housed in a groove (27a, 27b) extending in circumferential direction on the inner side of said cover ring and is supported on the outside of said tubular member.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |