US3609485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant torsional oscillators
Assignee: FREQUENCY CONTROL PRODUCTS Inc A CORP OF NY
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Filing: 1969-04-09
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Granted: 1971-09-28
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Expires: 1989-04-09
Abstract
Abstract A resonant torsional oscillator adapted to serve as an optical chopper or to provide other useful functions which require a vibratory action at a high amplitude and a constant rate. The oscillator is constituted by an erect torsional rod whose base is anchored, an optical element being attached to the free end of the rod. The rod is sustained in torsional vibration by means of an electromagnetically driven armature secured to the rod, the point of attachment being adjacent the base whereby the torsional swing at the free end of the rod is amplified with respect to that at said point.
Inventors
- 👤 Frank Dostal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:49
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A torsional oscillator comprising, a. an erect torsional rod anchored at its base, b. an optical element mounted on the masthead of the rod and swinging therewith, c. an armature secured transversely to the rod at a point thereon adjacent the base, the distance between said point and said base being short and the distance between said point and said masthead being relatively long, d. a magnetic circuit including an airgap which is relatively narrow to provide high flux density, one end of said armature being positioned within said airgap, e. a fixedly positioned drive coil surrounding said end of said armature, and f. means to apply periodic drive pulses to said coil at a rate corresponding to the resonance frequency of the rod to polarize said armature and thereby effect displacement thereof within said airgap, said armature applying a periodic torsional force to said rod, thereby causing said masthead to swing to an extent which is greater than the swing of said rod at said point and which depends on the length of the rod.
Claim 2
Dependent Claim
176 words
A torsional oscillator comprising, a. an erect torsional rod anchored at its base, b. an optical element mounted on the masthead of the rod and swinging therewith, c. an armature secured transversely to the rod at a point thereon adjacent the base, the distance between said point and said base being short and the distance between said point and said masthead being relatively long, d. a magnetic circuit including an airgap which is relatively narrow to provide high flux density, one end of said armature being positioned within said airgap, e. a fixedly positioned drive coil surrounding said end of said armature, and f. means to apply periodic drive pulses to said coil at a rate corresponding to the resonance frequency of the rod to polarize said armature and thereby effect displacement thereof within said airgap, said armature applying a periodic torsional force to said rod, thereby causing said masthead to swing to an extent which is greater than the swing of said rod at said point and which depends on the length of the rod.
Claim 3
Dependent Claim
28 words
An oscillator as set forth in claim 1, further including a second magnetic circuit at the other end of the armature and a second drive coil associated therewith.
Claim 4
Dependent Claim
49 words
An oscillator as set forth in claim 1, further including a second armature secured transversely to said rod adjacent said armature, and a pickup electromagnet associated with one end of said second armature, said electromagnet having voltage pulses induced therein which are amplified and applied to said drive coil.
Claim 5
Dependent Claim
63 words
An oscillator as set forth in claim 1, wherein said rod is anchored on a base plate and said magnetic circuit is formed by a pair of soft-iron frame elements mounted vertically along the long sides of said plate, said elements having a pair of bent-in end tabs forming said airgap, and a permanent magnet slab disposed between said elements in contact therewith.
Claim 6
Dependent Claim
17 words
An oscillator as set forth in Claim 4, wherein said drive coil is mounted on said tabs.
Claim 7
Dependent Claim
22 words
An oscillator as set forth in claim 1, wherein said rod is made of an alloy substantially insensitive to changes in temperature.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |