US5088055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coordinate measuring apparatus having a stylus friction compensating means
Assignee: Okuma Corp
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Filing: 1990-02-22
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Granted: 1992-02-11
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Expires: 2010-02-22
Abstract
Abstract A digitize control apparatus having a measuring function of the present invention determines a correct contact point between a stylus and a model on the basis of the displacement vector of a stylus obtained by a scanning head and a position vector indicating a machine coordinate value obtained by a position detecting apparatus, and therefore the influence of friction generated between a stylus and a model can be removed, thereby reducing error in the measurements.
Inventors
- 👤 Hiroshi Oyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/42; G05B19/4202; G05B19/4207
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A coordinate measurement apparatus for determining contact points between a stylus and a model, said coordinate measurement apparatus comprising: conveying means for conveying the stylus relative to a surface of the model while maintaining a constant magnitude of a displacement of the stylus; scanning head means for detecting the displacement of the stylus; position detecting means for detecting a relative position of the stylus; tangent line vector calculating means for calculating a tangent line vector of the model which is tangent a trace of a first position vector indicating a center of the stylus, the first position vector corresponding to a sum of a displacement vector denoting the displacement of the stylus obtained by said scanning head means and a second position vector denoting the relative position of the stylus obtained by said position detecting means; normal line vector calculating means for calculating a normal line vector which intersects normal to the tangent line vector at a magnitude in accordance with the displacement vector; and means for calculating a third position vector denoting a contact point between the stylus and the model based on the displacement vector, the second position vector, the normal line vector and a radius of the stylus.
Claim 2
Dependent Claim
201 words
A coordinate measurement apparatus for determining contact points between a stylus and a model, said coordinate measurement apparatus comprising: conveying means for conveying the stylus relative to a surface of the model while maintaining a constant magnitude of a displacement of the stylus; scanning head means for detecting the displacement of the stylus; position detecting means for detecting a relative position of the stylus; tangent line vector calculating means for calculating a tangent line vector of the model which is tangent a trace of a first position vector indicating a center of the stylus, the first position vector corresponding to a sum of a displacement vector denoting the displacement of the stylus obtained by said scanning head means and a second position vector denoting the relative position of the stylus obtained by said position detecting means; normal line vector calculating means for calculating a normal line vector which intersects normal to the tangent line vector at a magnitude in accordance with the displacement vector; and means for calculating a third position vector denoting a contact point between the stylus and the model based on the displacement vector, the second position vector, the normal line vector and a radius of the stylus.
Claim 3
Dependent Claim
42 words
In an apparatus a claimed in claim 1, wherein said normal line vector calculating means determines said normal line vector based on a sum of said displacement vector and a vector obtained by multiplying said tangent line vector by a numeric value.
Claim 4
Dependent Claim
43 words
In an apparatus as claimed in claim 2, wherein said normal line vector calculating means determines the numeric value in accordance with the following equation, ##EQU6## where, k is the numeric value, ε is the displacement vector, t is the tangent line vector.
Claim 5
Dependent Claim
58 words
An apparatus as claimed in claim 1, wherein said third position vector calculating means calculates said third position vector in accordance with the following equation, ##EQU7## where, G is the third position vector, P is the second position vector, ε is the displacement vector, R is the radius of the stylus, and n is the normal line vector.
Claim 6
Dependent Claim
58 words
An apparatus as claimed in claim 2, wherein said third position vector calculating means calculates said third position vector in accordance with the following equation, ##EQU8## where, G is the third position vector, P is the second position vector, ε is the displacement vector, R is the radius of the stylus, and n is the normal line vector.
Claim 7
Dependent Claim
58 words
An apparatus as claimed in claim 3, wherein said third position vector calculating means calculates said third position vector in accordance with the following equation, ##EQU9## where, G is the third position vector, P is the second position vector, ε is the displacement vector, R is the radius of the stylus, and n is the normal line vector.
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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |