Patent US3783191A successfully refreshed from Google Patents.
US3783191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Objective lens for television cameras
Assignee: Minolta Co Ltd
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Filing: 1972-12-27
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Granted: 1974-01-01
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Expires: 1992-12-27
Abstract
Abstract An objective lens for television cameras is provided wherein a bodytube supporting the objective lens and a shield case of the electrical system of the camera including the vidicon tube are maintained at the same potential when connected to each other for preventing disturbances on the received picture image caused by a potential discrepancy in the transmitting system. The objective lens has a mounting or coupling portion by way of which the lens is conductively mounted on the casing of the electric system of the television camera accommodating the vidicon tube. In order to improve conductivity in the connection between the mounting portion of the objective lens and the closest portion to the television camera of a movable member which supports the lenses, conduction surfaces are provided on the mounting portion and the closest portion to the television camera of the movable member and an electrically conductive member is interposed between the two conduction surfaces in constantly contacting relationship therewith for maintaining the closest portion to the television camera of the objective lens and the photoelectric surface of the vidicon at the same potential.
Inventors
- 👤 N Sugimoto
- 👤 S Ohneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:08
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
An objective lens for a television camera including a receptacle comprising: a fitting tube having a connecting portion for conductively connecting said objective lens to said receptacle portion of the television camera; a conductive surface formed on the inner periphery of said fitting tube; a lens frame composed of at least one tube for supporting a plurality of lenses movable along the optical axis of the lens with respect to said fitting tube and having a conductive surface formed on the outer periphery of one tube of said lens frame located close to the television camera and an electrically conductive member for connecting said conductive surfaces of said fitting tube and said tube constantly irrespective of the movement of the lens frame along the optical axis of the objective lens.
Claim 2
Dependent Claim
130 words
An objective lens for a television camera including a receptacle comprising: a fitting tube having a connecting portion for conductively connecting said objective lens to said receptacle portion of the television camera; a conductive surface formed on the inner periphery of said fitting tube; a lens frame composed of at least one tube for supporting a plurality of lenses movable along the optical axis of the lens with respect to said fitting tube and having a conductive surface formed on the outer periphery of one tube of said lens frame located close to the television camera and an electrically conductive member for connecting said conductive surfaces of said fitting tube and said tube constantly irrespective of the movement of the lens frame along the optical axis of the objective lens.
Claim 3
Dependent Claim
73 words
An objective lens for a television camera as set forth in claim 1, wherein said electrically conductive member has a length longer than the length along which the closest tube to the television camera of said lens frame moves for adjusting the focus relative to said fitting tube, and both ends of said electrically conductive member are respectively fixed to the fitting tube and said tube of said lens frame to electrically conduct.
Claim 4
Dependent Claim
29 words
An objective lens for a television camera as set forth in claim 1 wherein said electrically conductive member is composed of a resilient member of highly conductive metallic material.
Claim 5
Dependent Claim
98 words
An objective lens for a television camera as set forth in claim 3, further comprising: a front lens frame for supporting a front lens group; a rear lens frame for supporting a rear lens group; an inner tube integrally connecting said front and rear lens frames and movable with respect to the fitting tube for focusing along the optical axis of the objective lens; and SAID conductive surface formed on the outer periphery of said lens frame being formed on the outer periphery of said rear lens frame and extending along the optical axis of the objective lens.
Claim 6
Dependent Claim
66 words
An objective lens for a television camera as set forth in claim 3, wherein said resilient member is formed from a metal strip, with one side thereof conductively riveted to the inner periphery of said fitting tube and the other side being slidably contacting the conductive surface formed on the outer periphery of said lens frame constantly irrespective of the axial position of the lens frame.
Claim 7
Dependent Claim
72 words
An objective lens for a television camera as set forth in claim 3, wherein said resilient member is formed from a metal strip, with one side thereof being conductively riveted to the outer periphery of the lens frame and the other side being slidable on the conductive surface formed on the inner periphery of said fitting tube irrespective of the axial position of said lens frame with respect to said fitting tube.
Claim 8
Dependent Claim
60 words
An objective lens for a television camera as set forth in claim 3, wherein said resilient member is formed from a strip of highly conductive metal of a wavy ring shape with the ridges of the waves extending in radial directions, the resilient member being interposed between said fitting tube and lens frame in contact with the conductive surfaces thereof.
Claim 9
Dependent Claim
60 words
An objective lens for a television camera as set forth in claim 3, wherein said resilient member is formed from a wire of highly conductive metal of a wavy ring shape with the ridges of the waves extending in radial directions, the resilient member being interposed between said fitting tube and lens frame in contact with the conductive surfaces thereof.
Claim 10
Dependent Claim
90 words
An objective lens for a television camera as set forth in claim 3, wherein: an annular groove is formed on the inner periphery of said fitting tube and has a conductive surface, and further comprising a resilient ring of a highly conductive metal in the form of a wavy ring with the ridges and grooves thereof extended in radial directions, the ridges of the waves being fitted into said annular groove and the grooves of the waves being held in sliding contact with the conductive surface on said lens frame.
Claim 11
Dependent Claim
134 words
An objective lens for a television camera including an objective lens first coupling member comprising: a tubular barrel member including at its rear end a second coupling member mating said first coupling in a highly conductive electrical connection therewith and having a first highly conductive peripheral face; a tubular sleeve member axially slideable within said barrel member and having a second highly electrically conductive peripheral face radially spaced from said conductive peripheral face, the conductive peripheral face of at least one of said peripheral members being exposed to the other peripheral member; and means for electrically connecting said conductive peripheral faces to maintain them at an equipotential with said connected coupling members including a brush member electrically connected between said conductive peripheral surfaces and slideably engaging at least one of said conductive peripheral surfaces.
Claim 12
Dependent Claim
134 words
An objective lens for a television camera including an objective lens first coupling member comprising: a tubular barrel member including at its rear end a second coupling member mating said first coupling in a highly conductive electrical connection therewith and having a first highly conductive peripheral face; a tubular sleeve member axially slideable within said barrel member and having a second highly electrically conductive peripheral face radially spaced from said conductive peripheral face, the conductive peripheral face of at least one of said peripheral members being exposed to the other peripheral member; and means for electrically connecting said conductive peripheral faces to maintain them at an equipotential with said connected coupling members including a brush member electrically connected between said conductive peripheral surfaces and slideably engaging at least one of said conductive peripheral surfaces.
Claim 13
Dependent Claim
50 words
The objective lens of claim 10 wherein said brush member comprises a resilient metal strip having one end affixed to one of said tubular members and connected to the conductive peripheral face thereof and its other end free and biased toward and slideably bearing on the other conductive peripheral face.
Claim 14
Dependent Claim
38 words
The objective lens of claim 10 wherein said conductive peripheral faces are exposed to and confront each other and said brush member comprises a radially undulate resilient metal ring sandwiched between and slideably engaging said conductive peripheral faces.
References Cited (Backward Citations)
US3609236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |