US4657361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror mounting arrangement
Assignee: Evonik Operations GmbH
•
Filing: 1985-03-14
•
Granted: 1987-04-14
•
Expires: 2005-03-14
Abstract
Abstract Viscoelastic damping material (45, 80 and 105) effectively damps the resonant responses of a mirror (10) and a mount (12) therefor to vibratory disturbances thereof by such phenomena as pressure pulses in a pulsed chemical laser cavity.
Inventors
- 👤 Frederick G. Eitel
- 👤 Robert G. Jaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:58
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/18; G02B7/182
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
In an optical system comprising a mirror subject to vibratory disturbances thereon and means for mounting said mirror to a structure, the improvement characterized by: a thin layer of viscoelastic damping material disposed between said mirror and mounting means for damping said vibratory disturbance; and means for positively attaching said mirror to said mounting means while limiting the compressive loading of said viscoelastic damping material resulting from said attachment, thereby reducing the risk of creep of said viscoelastic damping material.
Claim 2
Dependent Claim
80 words
In an optical system comprising a mirror subject to vibratory disturbances thereon and means for mounting said mirror to a structure, the improvement characterized by: a thin layer of viscoelastic damping material disposed between said mirror and mounting means for damping said vibratory disturbance; and means for positively attaching said mirror to said mounting means while limiting the compressive loading of said viscoelastic damping material resulting from said attachment, thereby reducing the risk of creep of said viscoelastic damping material.
Claim 3
Dependent Claim
40 words
The optical system of claim 1 characterized by said mounting means comprising a constraining plate and said attaching means comprising a fastener received within said constraining plate and, to a limited extent of penetration, within the back of said mirror.
Claim 4
Dependent Claim
27 words
The optical system of claim 2 characterized by a seal disposed between said mirror and said constraining plate for sealing said viscoelastic damping material from ambient contamination.
Claim 5
Dependent Claim
29 words
The optical system of claim 1 characterized by said attaching means including a fastener and resilient means carried thereby which provide said limited loading of said viscoelastic damping material.
Claim 6
Dependent Claim
46 words
The optical system of claim 4 characterized by said mounting means comprising a constraining plate, said fastener comprising a bolt and said resilient means comprising at least one belleville spring carried by said bolt and compressed between a back surface of said mirror and said plate.
Claim 7
Dependent Claim
22 words
The optical system of claim 1 characterized by said viscoelastic damping layer being of a thickness of from 0.001 to 0.010 inch.
Claim 8
Dependent Claim
43 words
The optical system of claim 1 characterized by said mirror including a generally cylindrical flange extending rearwardly from the back of said mirror and said mounting means comprising a generally annular mounting ring fixed thereto and compressively restraining said viscoelastic damping material thereagainst.
Claim 9
Dependent Claim
34 words
The optical system of claim 7 characterized by said mounting ring comprising a plurality of segments fixed to said cylindrical flange by radially oriented fasteners received within said mounting ring and said cylindrical flange.
Claim 10
Dependent Claim
67 words
The optical system of claim 7 characterized by said cylindrical flange including at an edge thereof, an annular shoulder portion, said mounting means further comprising a stiff rear mounting plate attached to said shoulder portion for isolating said mounting ring and cylindrical flange from differential thermal expansion between said mounting plate and those portions of said optical system to which said mirror and mounting means are fixed.
Claim 11
Dependent Claim
26 words
The optical system of claim 9 characterized by a thin layer of said viscoelastic damping material disposed between said rear plate and said annular shoulder portion.
Claim 12
Dependent Claim
28 words
The optical system of claim 10 characterized by fasteners which fix said rear mounting plate to said annular shoulder portion and compressively restrain said viscoelastic damping material therebetween.
References Cited (Backward Citations)
US2412838A
Cited
US3313077A
Cited
US3404352A
Cited
US3565386A
Cited
US3897139A
Cited
US3952980A
Cited
US3953113A
Cited
US4060315A
Cited
US4060314A
Cited
US4171873A
Cited
US4278726A
Cited
US4522365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |