US3877794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic lens mounting for varifocal objective
Assignee: ISK Optics GmbH
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Filing: 1973-11-12
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Granted: 1975-04-15
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Expires: 1993-11-12
Abstract
Abstract A stationary outer lens barrel slidably receives a movable inner lens barrel serving to support two axially displaceable components of a varifocal objective in interleaved relationship with two fixed components supported in the outer lens barrel. One of the fixed components, i.e. the rearmost component of the fourcomponent varifocal group, is seated on a fixed internal abutment of the outer lens barrel; the other fixed component, i.e. the second from the front, is carried on an insert which is guided in axial wall slots of the inner lens barrel and is snapped into recesses on the inner wall surface of the outer lens barrel before the movable front lens is positioned in its seat on the inner lens barrel.
Inventors
- 👤 Elfriede Kulle
- 👤 Rolf Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:20
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B7/105
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
205 words
A mounting for a four-component varifocal lens group including a movable first component, a fixed second components, a movable third component and a fixed fourth component, comprising: an outer lens barrel with a rear end forming a seat for said fourth component, said outer lens barrel having an inner wall surface with a plurality of peripherally spaced recesses bounded at the front by overhanging shoulders; an inner lens barrel slidably telescoped in said outer lens barrel, said inner lens barrel forming two axially spaced seats for said first and third components and being provided with a plurality of peripherally spaced wall slots in line with said recesses extending axially from a front end thereof; an insert comprising a central ring with a plurality of axially directed legs with forwardly extending free ends peripherally secured to said ring, said legs being received in said wall slots and in the recesses of said outer lens barrel aligned therewith, said ring forming a seat for said second component; and fastening means for immobilizing said insert with reference to said outer lens barrel, said fastening means including outer projections on said legs near their free ends received with a snap fit in said recesses in contact with said shoulders.
Claim 2
Dependent Claim
205 words
A mounting for a four-component varifocal lens group including a movable first component, a fixed second components, a movable third component and a fixed fourth component, comprising: an outer lens barrel with a rear end forming a seat for said fourth component, said outer lens barrel having an inner wall surface with a plurality of peripherally spaced recesses bounded at the front by overhanging shoulders; an inner lens barrel slidably telescoped in said outer lens barrel, said inner lens barrel forming two axially spaced seats for said first and third components and being provided with a plurality of peripherally spaced wall slots in line with said recesses extending axially from a front end thereof; an insert comprising a central ring with a plurality of axially directed legs with forwardly extending free ends peripherally secured to said ring, said legs being received in said wall slots and in the recesses of said outer lens barrel aligned therewith, said ring forming a seat for said second component; and fastening means for immobilizing said insert with reference to said outer lens barrel, said fastening means including outer projections on said legs near their free ends received with a snap fit in said recesses in contact with said shoulders.
Claim 3
Dependent Claim
40 words
A mounting as defined in claim 1 wherein said inner lens barrel is provided with a peripheral front flange having an outer diameter larger than the inner diameter of said outer lens barrel, said wall slots terminating at said flange.
Claim 4
Dependent Claim
35 words
A mounting as defined in claim 2, further comprising a stepped annular head threadedly secured to said flange, said head projecting forwardly from said outer lens barrel to facilitate manipulation of said inner lens barrel.
Claim 5
Dependent Claim
28 words
A mounting as defined in claim 3 wherein said head coacts with the more forward one of said axially spaced seats to lock said first component in position.
Claim 6
Dependent Claim
20 words
A mounting as defined in claim 3 wherein said lens barrels, said insert and said head consist of plastic material.
Claim 7
Dependent Claim
35 words
A mounting as defined in claim 1 wherein said inner lens barrel is provided with a set of external longitudinal ribs contacting the inner wall surface of said outer lens barrel to facilitate relative sliding.
Claim 8
Dependent Claim
32 words
A mounting as defineD in claim 6 wherein said inner lens barrel has a rearwardly facing skirt with peripheral slits dividing same into outwardly biased segments, said ribs extending over said segments.
Claim 9
Dependent Claim
16 words
A mounting as defined in claim 7 wherein said slits are peripherally interleaved with said ribs.
Claim 10
Dependent Claim
22 words
A mounting as defined in claim 1 wherein said legs are substantially L-shaped and have radially extending portions secured to said ring.
Claim 11
Dependent Claim
27 words
A mounting as defined in claim 9 wherein slots terminate in stops engageable by said radially extending portions in an extended position of said inner lens barrel.
References Cited (Backward Citations)
US3582188A
Cited
US3748024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |