US4330183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflex device with a mirror substrate of vitreous carbon
Assignee: Arnold and Richter Cine Technik GmbH and Co KG
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Filing: 1979-07-06
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Granted: 1982-05-18
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Expires: 1999-07-06
Abstract
Abstract Reflex devices, preferably on cinematographic and photographic cameras with rotating, oscillating or displaceable retracting mirrors are easier to balance the lighter the dynamically operated reflecting mirror is in weight. The weight reduction is achieved by using pure carbon, preferably in the form of glass-like carbon, for the mirror carrier material. The pores in the micro range exposed at the polished surface during the precision treatment are eliminated by an additional vacuum treatment in the production of the three-dimensionally cross-linked plastics intermediate product.
Inventors
- 👤 Erich Kastner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; G; G02; G02B; G02B5/00; G02B5/08; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A mirror reflex installation for use in a camera, the mirror reflex installation being mountable in the camera for movement, such as rotating, oscillating, and folding, and comprising: a mirror substate formed of vitreous carbon and having one surface processed to have a glass-like finish; and a mirror coating applied to said one surface of said mirror substrate.
Claim 2
Dependent Claim
58 words
A mirror reflex installation for use in a camera, the mirror reflex installation being mountable in the camera for movement, such as rotating, oscillating, and folding, and comprising: a mirror substate formed of vitreous carbon and having one surface processed to have a glass-like finish; and a mirror coating applied to said one surface of said mirror substrate.
Claim 3
Dependent Claim
99 words
In a photographic camera having a first lens system defining an exposure beam, a second lens system defining a viewing beam, a mirror assembly, and means for moving said mirror assembly between a first position in which the assembly blocks the exposure beam and reflects the viewing beam and a second position in which the assembly is spaced from the exposure beam, the improvement wherein the mirror assembly comprises: a mirror substate formed of vitreous carbon and having one surface processed to have a glass-like finish; and a mirror coating applied to said one surface of said mirror substrate.
Claim 4
Dependent Claim
99 words
In a photographic camera having a first lens system defining an exposure beam, a second lens system defining a viewing beam, a mirror assembly, and means for moving said mirror assembly between a first position in which the assembly blocks the exposure beam and reflects the viewing beam and a second position in which the assembly is spaced from the exposure beam, the improvement wherein the mirror assembly comprises: a mirror substate formed of vitreous carbon and having one surface processed to have a glass-like finish; and a mirror coating applied to said one surface of said mirror substrate.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |