Patent US2902878A successfully refreshed from Google Patents.
US4627291A
Expired / Lapsed
US
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Position sensing apparatus for an object to be measured
Assignee: Panasonic Holdings Corp
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Filing: 1984-06-05
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Granted: 1986-12-09
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Expires: 2004-06-05
Abstract
Abstract A position sensing apparatus includes an ultrasonic wave transmit-receive element for transmitting and receiving ultrasonic waves to and from an object whose position is to be sensed and a manipulator for changing the relative positions between the object and the ultrasonic wave transmit-receive element, and a signal processor utilizing changes in the reflected signal intensity in the vicinity of the center of the object to be measured, thereby sensing the position of the object.
Inventors
- 👤 Toshinori Otsuki
- 👤 Teruo Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:43
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/06; G01B; G01B17/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A position sensing apparatus for an object to be measured which comprises: a first means including an ultrasonic wave transmit-receive element for transmitting an ultrasonic wave to the object to be measured and for receiving a reflected wave therefrom; a second means for maintaining said ultrasonic wave transmit-receive element at a predetermined distance from said object and for effecting a linear movement of said element with respect to said object, said element having a wave transmit-receive surface which is inclined at a predetermined angle of inclination with respect to a measured surface of said object; and a third means for detecting a center position of a bore or groove formed in said measured surface of said object by utilizing a change in intensity of a signal corresponding to said reflected wave from said measured surface.
Claim 2
Dependent Claim
135 words
A position sensing apparatus for an object to be measured which comprises: a first means including an ultrasonic wave transmit-receive element for transmitting an ultrasonic wave to the object to be measured and for receiving a reflected wave therefrom; a second means for maintaining said ultrasonic wave transmit-receive element at a predetermined distance from said object and for effecting a linear movement of said element with respect to said object, said element having a wave transmit-receive surface which is inclined at a predetermined angle of inclination with respect to a measured surface of said object; and a third means for detecting a center position of a bore or groove formed in said measured surface of said object by utilizing a change in intensity of a signal corresponding to said reflected wave from said measured surface.
Claim 3
Dependent Claim
64 words
A position sensing apparatus for an object to be measured as set forth in claim 1, wherein if a wavelength of said ultrasonic wave transmitted and received by said ultrasonic wave transmit-receive element is represented by λ and a diameter of said ultrasonic wave transmit-receive element is represented by D, then θ=sin 1.22λ/D (rad) and said angle of inclination is substantially equal to θ.
Claim 4
Dependent Claim
165 words
A position sensing apparatus for an object to be measured which comprises: a first means including an ultrasonic wave transmit-receive element for transmitting an ultrasonic wave to the object to be measured and for receiving a reflected wave therefrom; a second means for maintaining said ultrasonic wave transmit-receive element at a predetermined distance from said object and for effecting a linear movement of said element with respect to said object, said element having a wave transmit-receive surface which is inclined at a predetermined angle of inclination with respect to a measured surface of said object; and a third means for detecting a minimum value of intensity of a signal corresponding to said reflected wave from said measured surface of said object and for sensing a center position of a bore or groove formed in said measured surface from an amount of change in the relative positional relationship between said ultrasonic wave transmit-receive element and said object at the time of detection of said minimum value.
Claim 5
Dependent Claim
165 words
A position sensing apparatus for an object to be measured which comprises: a first means including an ultrasonic wave transmit-receive element for transmitting an ultrasonic wave to the object to be measured and for receiving a reflected wave therefrom; a second means for maintaining said ultrasonic wave transmit-receive element at a predetermined distance from said object and for effecting a linear movement of said element with respect to said object, said element having a wave transmit-receive surface which is inclined at a predetermined angle of inclination with respect to a measured surface of said object; and a third means for detecting a minimum value of intensity of a signal corresponding to said reflected wave from said measured surface of said object and for sensing a center position of a bore or groove formed in said measured surface from an amount of change in the relative positional relationship between said ultrasonic wave transmit-receive element and said object at the time of detection of said minimum value.
Claim 6
Dependent Claim
64 words
A position sensing apparatus for an object to be measured as set forth in claim 3, wherein if a wavelength of said ultrasonic wave transmitted and received by said ultrasonic wave transmit-receive element is represented by λ and a diameter of said ultrasonic wave transmit-receive element is represented by D, then θ=sin 1.22λ/D (rad) and said angle of inclination is substantially equal to θ.
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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |