US4445136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television camera having an optical lowpass filter
Assignee: Victor Company of Japan Ltd
•
Filing: 1981-12-11
•
Granted: 1984-04-24
•
Expires: 2001-12-11
Abstract
Abstract A television camera has an optical system including an iris, a master lens, and a color stripe filter. The television camera further comprises an optical lowpass filter provided within an effective light path of an afocal system which reaches the master lens through the iris. The optical lowpass filter has a shape to partially produce an optical lowpass filter effect with respect to a part of a beam in the effective light path.
Inventors
- 👤 Takashi Shinozaki
- 👤 Yoshichi Ohtake
- 👤 Shinsuke Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:13
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A television camera having an optical system including an iris, a master lens, and a color stripe filter, said television camera further comprising: an optical lowpass filter provided within an effective light path of an afocal system which reaches said master lens through said iris, said optical lowpass filter having a shape to partially produce an optical lowpass filter effect with respect to a part of a beam in said effective light path.
Claim 2
Dependent Claim
73 words
A television camera having an optical system including an iris, a master lens, and a color stripe filter, said television camera further comprising: an optical lowpass filter provided within an effective light path of an afocal system which reaches said master lens through said iris, said optical lowpass filter having a shape to partially produce an optical lowpass filter effect with respect to a part of a beam in said effective light path.
Claim 3
Dependent Claim
38 words
A television camera as claimed in claim 1 in which said optical lowpass filter has a shape to produce the optical lowpass filter effect with respect to 20% to 80% of the beam in said effective light path.
Claim 4
Dependent Claim
36 words
A television camera as claimed in claim 1 in which said optical lowpass filter has a shape to produce the optical lowpass filter effect with respect to 50% of the beam in said effective light path.
Claim 5
Dependent Claim
28 words
A television camera as claimed in claim 1 in which said optical lowpass filter comprises an optical lowpass filter part formed in one part of a transparent plate.
Claim 6
Dependent Claim
27 words
A television camera as claimed in claim 4 in which half the transparent plate of said optical lowpass filter is formed with the optical lowpass filter part.
Claim 7
Dependent Claim
100 words
A television camera as claimed in claim 4 in which said optical lowpass filter part of the optical lowpass filter has a round shape and is formed at a center of the transparent plate adjacent to said iris, such that said lowpass filter part and remaining part of said optical lowpass filter affect the beam in said effective light path when a passing rate of said iris is greater than a predetermined level, and only said lowpass filter part affects the beam in said effective light path when the passing rate of said iris is less than said predetermined level.
Claim 8
Dependent Claim
29 words
A television camera as claimed in claim 1 in which said optical lowpass filter is shaped so that it is interposed across a part of said effective light path.
Claim 9
Dependent Claim
25 words
A television camera as claimed in claim 7 in which said part of said effective light path is substantially 50% of said effective light path.
Claim 10
Dependent Claim
57 words
A television camera as claimed in claim 7 in which said optical lowpass filter has a round shape and is positioned such that the center of said optical lowpass filter coincides with the center of said effective light path, and said optical lowpass filter has a diameter smaller than that of an opened aperture of said iris.
References Cited (Backward Citations)
DE2027035A1
Cited
US3641255A
Cited
DE2137466A1
Cited
US3821794A
Cited
DE2359512A1
Cited
SU604190A1
Cited
US4178611A
Cited
US4318123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |