US4361045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration sensor
Assignee: Aisin Corp
•
Filing: 1980-08-29
•
Granted: 1982-11-30
•
Expires: 2000-08-29
Abstract
Abstract A vibration sensor comprised of a movable body, a permanent magnet coupled to the movable body, and a displacement pulse phase conversion unit including a magnetically soft member carrying an electrical coil thereon and fixedly disposed in the vicinity of the course of movement of the permanent magnet. A pulse voltage is applied to one end of the electrical coil. A voltage drop occurs across a resistor which is connected in series with the other end of the electrical coil. A time lag of the voltage drop with respect to the pulse voltage, representing a vibrational amplitude, is provided in the form of an analog voltage.
Inventors
- 👤 Shinichiro Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01H; G01H11/00; G01H11/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A vibration sensor comprising: a casing; a permanent magnet defining a magnetization direction and movably disposed in said casing; spring means mounted in said casing for supporting said movable permanent magnet; a thin plate core of magnetically soft material defining a longitudinal axis and disposed within said casing adjacent to the vicinity of a course of movement of said movable permanent magnet; an electrical coil disposed around said magnetically soft material core, whereby said permanent magnet and magnetically soft material core are disposed in said casing such that the magnetization direction of said magnet is parallel to the longitudinal axis of said core; means for detecting vibrations based on correspondingly produced movement of said magnet, comprising; means for applying a pulse voltage to said coil to saturate magnetically said core: and means coupled to said coil for producing a vibration output signal indicative of the movement of said magnet and therefore of said vibrations based on the time between application of said pulse voltage and saturation of said core.
Claim 2
Dependent Claim
169 words
A vibration sensor comprising: a casing; a permanent magnet defining a magnetization direction and movably disposed in said casing; spring means mounted in said casing for supporting said movable permanent magnet; a thin plate core of magnetically soft material defining a longitudinal axis and disposed within said casing adjacent to the vicinity of a course of movement of said movable permanent magnet; an electrical coil disposed around said magnetically soft material core, whereby said permanent magnet and magnetically soft material core are disposed in said casing such that the magnetization direction of said magnet is parallel to the longitudinal axis of said core; means for detecting vibrations based on correspondingly produced movement of said magnet, comprising; means for applying a pulse voltage to said coil to saturate magnetically said core: and means coupled to said coil for producing a vibration output signal indicative of the movement of said magnet and therefore of said vibrations based on the time between application of said pulse voltage and saturation of said core.
Claim 3
Dependent Claim
23 words
A vibration sensor according to claim 1 wherein the direction of movement of said permanent magnet is same as the magnetization direction thereof.
Claim 4
Dependent Claim
23 words
A vibration sensor according to claim 1, wherein the direction of movement of said permanent magnet is perpendicular to the magnetization direction thereof.
References Cited (Backward Citations)
US2697594A
Cited
US2767973A
Cited
US2860313A
Cited
US2882392A
Cited
US2913688A
Cited
US3104552A
Cited
GB909023A
Cited
US3128625A
Cited
US3168830A
Cited
US3281743A
Cited
US3877314A
Cited
US3855528A
Cited
US4140971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |