US4480269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television camera
Assignee: Toshiba Corp
•
Filing: 1983-01-31
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Granted: 1984-10-30
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Expires: 2003-01-31
Abstract
Abstract A television camera equipped with an active filter section capable of producing dynamic special effects in the picture. The filter section of the camera includes an electro-optic light control device which is arranged in the optical path of the imaging optical section of the television camera such that its light transmittance for the incident light to the image screen of the camera is varied in response to the application of an electric signal, and the variable transmittance area is divided into a plurality of sections adapted to be controlled and drived selectively. Also, the camera includes a drive unit for selectively controlling and driving the sections of the electro-optic light control device so as to vary with time the spread of the area of the sections having the transmittance varied in response to the application of the electric signal.
Inventors
- 👤 Nobuaki Yoshida
- 👤 Yoshio Mori
- 👤 Kazushige Ooi
- 👤 Sumio Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/153; G02F1/155; H; H04; H04N; H04N23/00; H04N23/50; H04N23/55
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
In a television camera including an imaging optical system, and an image pickup device arranged on an image forming plane of said imaging optical system for converting an image of a televised object from said imaging optical system to an electric signal, the improvement comprising: (a) electro-optic light control means (2) arranged in an optical path of said imaging optical system, said electro-optic light control means being divided into a plurality of sections (13, 17) each thereof being responsive to the application of an electric signal to vary the light transmittance thereof; and (b) drive means (4) electrically connected to said electro-optic light control means (2) to apply an electric signal to each of said plurality of sections in a predetermined sequence and thereby vary the light transmittance of said electro-optic light control means selectively and with time.
Claim 2
Dependent Claim
138 words
In a television camera including an imaging optical system, and an image pickup device arranged on an image forming plane of said imaging optical system for converting an image of a televised object from said imaging optical system to an electric signal, the improvement comprising: (a) electro-optic light control means (2) arranged in an optical path of said imaging optical system, said electro-optic light control means being divided into a plurality of sections (13, 17) each thereof being responsive to the application of an electric signal to vary the light transmittance thereof; and (b) drive means (4) electrically connected to said electro-optic light control means (2) to apply an electric signal to each of said plurality of sections in a predetermined sequence and thereby vary the light transmittance of said electro-optic light control means selectively and with time.
Claim 3
Dependent Claim
28 words
A television camera according to claim 1, wherein said electro-optic light control means (2) is arranged just in front of an image screen of said image pickup device.
Claim 4
Dependent Claim
20 words
A television camera according to claim 2, wherein said electro-optic light control means (2) comprises an all solid-state electrochromic device.
Claim 5
Dependent Claim
26 words
A television camera according to claim 3, wherein said electrochromic device (7, 14) is directly formed on said image pickup device by a film forming process.
Claim 6
Dependent Claim
62 words
A television camera according to claim 2, wherein said electro-optic light control means (2) comprises a plurality of electro-optic light control elements (7, 14) arranged successively in said light path, and wherein each of said elements is divided into a plurality of sections (13, 17) each thereof being responsive to the application of an electric signal to vary the light transmittance thereof.
Claim 7
Dependent Claim
50 words
A television camera according to claim 5, wherein the number of said elements (7, 14) is two, and wherein said two elements are arranged such that each of the sections of one of said two elements faces the gap between the adjacent sections of the other of said two elements.
References Cited (Backward Citations)
DE2248183A1
Cited
US3986022A
Cited
US4218120A
Cited
US4363034A
Cited
US4437111A
Cited
US4431288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |