Patent US1941411A successfully refreshed from Google Patents.
US4731777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk player
Assignee: Sony Corp
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Filing: 1985-10-09
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Granted: 1988-03-15
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Expires: 2005-10-09
Abstract
Abstract In an optical disk player according to this invention, a movable chassis mounted with an optical pickup, a turntable and the like is supported by springs joined with respective positions of a frame, and in this optical disk player, dampers are inserted between the frame and the movable chassis to absorb the energy of vibrations of the movable chassis. At the same time, a correcting means such as a coiled spring is so arranged as to be capable of changing the biasing force for biasing the movable chassis in a neutral condition with respect to the frame by adjustment operation. With the above arrangement, the slope of Q-value of the resonance region becomes moderate enough at the leading edge of the slope, and thus the vibration isolation characteristic is improved, so that sound omissions tend not to occur. The degradation of the vibration isolation characteristic of the damper that usually occurs on tilt of the chassis is effectively prevented. At the same time, a collision between the frame and the movable chassis can be prevented without increasing the movable range of the movable chassis with respect to the frame.
Inventors
- 👤 You Yoshitoshi
- 👤 Tsutomu Toyoguchi
- 👤 Ryoji Takamatsu
- 👤 Yoshiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:07
CPC Classifications
G; G11; G11B; G11B7/00; G11B25/00; G11B25/04; G11B25/043; F; F16; F16F; F16F9/00; F16F9/10; F16F9/103; G11B17/00; G11B17/02; G11B17/04; G11B33/00; G11B33/02; G11B33/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
An optical disk player in which a movable chassis member mounted with an optical pickup, a turntable and the like, is supported by a plurality of springs connected to respective positions on a frame member to hold the movable chassis in a floating state with respect to the frame, comprising at least one damper inserted between said frame member and said movable chassis member so as to absorb the energy of vibrations of said movable chassis, each said damper comprising a generally horizontal rod fixed to one of said members and a resilient vessel of viscous liquid secured to the other of said members with said rod secured centrally of said vessel, and correcting means between said member and said movable chassis member to adjust a resilient biasing force for biasing said movable chassis with respect to said frame by adjustment operation, wherein a positional deviation of said movable chassis causing movement of said rod away from centered condition in said vessel is corrected by adjusting the biasing force, so that said movable chassis is kept with said rod in centered condition in neutral equilibrium position regardless of the setting angle of said frame.
Claim 2
Dependent Claim
194 words
An optical disk player in which a movable chassis member mounted with an optical pickup, a turntable and the like, is supported by a plurality of springs connected to respective positions on a frame member to hold the movable chassis in a floating state with respect to the frame, comprising at least one damper inserted between said frame member and said movable chassis member so as to absorb the energy of vibrations of said movable chassis, each said damper comprising a generally horizontal rod fixed to one of said members and a resilient vessel of viscous liquid secured to the other of said members with said rod secured centrally of said vessel, and correcting means between said member and said movable chassis member to adjust a resilient biasing force for biasing said movable chassis with respect to said frame by adjustment operation, wherein a positional deviation of said movable chassis causing movement of said rod away from centered condition in said vessel is corrected by adjusting the biasing force, so that said movable chassis is kept with said rod in centered condition in neutral equilibrium position regardless of the setting angle of said frame.
Claim 3
Dependent Claim
29 words
The optical disk player according to claim 1, characterized in that said movable chassis is suspended from said frame by said springs, and four substantially spaced dampers are provided.
Claim 4
Dependent Claim
54 words
The optical disk player according to claim 1, characterized in that said frame comprises a pair of side plates and a connecting member by which said pair of side plates are connected with each other, said connecting member being provided with adjusting means for changing the biasing force at an angle to the horizontal.
Claim 5
Dependent Claim
26 words
The optical disk player according to claim 3, characterized in that said correcting means is a coiled spring secured between said frame and said connecting member.
Claim 6
Dependent Claim
18 words
The optical disk player according to claim 1, characterized in that said adjusting means is an eccentric cam.
Claim 7
Dependent Claim
38 words
The optical disk player according to claim 1, characterized in that said frame is accommodated in a cabinet, in the upper wall of which an opening for adjustment operation is formed in order to operate said adjusting means.
Claim 8
Dependent Claim
81 words
The optical disk player according to claim 1, characterized in that said vessel comprises an elastic material, enclosing a viscous fluid in a space defined within said vessel, and said rod being coupled to said vessel, said vessel being provided with a prism-like portion projected into said space and secured to said rod for movement therewith and for resisting movement of said rod relative to said vessel to thereby increase energy absorption upon relative movement of said rod and said vessel.
References Cited (Backward Citations)
BE560643A
Cited
US3263953A
Cited
US3510137A
Cited
GB1399525A
Cited
JPS51103402A
Cited
JPS5312306A
Cited
US4387453A
Cited
JPS6077099A
Cited
JPS6098589A
Cited
US4570253A
Cited
US4633973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |