Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1999-03-23
2000-11-14
Bennett, G. Bradley
Geometrical instruments
Distance measuring
Scale reading position sensor
33708, 32420724, G01B 704
Patent
active
061452149
ABSTRACT:
The present invention provides a position detection apparatus capable of suppressing a crosstalk between a scale signal and an origin signal and detecting a position with a high accuracy. A recording medium 12 of a round bar shape has a magnetic signal alternately reversing the polarity at a predetermined recording wavelength .lambda..sub.1 and recorded as a scale signal in the longitudinal direction of the recording medium 12. This scale signal is recorded over the entire outer circumferential surface of the recording medium 12 and almost over the entire length of the recording medium 12. Moreover, the recording medium 12 has a one-wavelength origin signal of recording wavelength .lambda..sub.2 recorded at least at one position over the scale signal. The recording wavelength .lambda..sub.2 of this origin signal is longer than the recording wavelength .lambda..sub.1 of the scale signal. The origin signal is recorded at a part of the outer circumference. An origin signal detection head is arranged to face the origin signal whereas a scale signal detection head is arranged opposite to the origin signal detection head so as to sandwich the recording medium 12.
REFERENCES:
patent: 4459750 (1984-07-01), Affa
patent: 4523381 (1985-06-01), Narimatsu et al.
patent: 5430373 (1995-07-01), Ichikawa et al.
patent: 5434602 (1995-07-01), Kaburagi et al.
patent: 5497083 (1996-03-01), Nakazato et al.
patent: 5793201 (1998-08-01), Nelle et al.
Shimano Tadahiko
Yoshioka Takamoto
Bennett G. Bradley
Maioli Jay H.
Sony Precision Technology Inc.
LandOfFree
Position detection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position detection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position detection apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2052925