Coded data generation or conversion – Digital pattern reading type converter – Optical
Patent
1986-08-04
1989-11-07
Shoop, Jr., William M.
Coded data generation or conversion
Digital pattern reading type converter
Optical
250231SE, H03M 122
Patent
active
048795550
ABSTRACT:
A first pattern which repeats change in the longitudinal direction with a predetermined pitch and a second pattern which changes in the longitudinal direction with a pitch which is different at least from that of the first pattern; both formed of a predetermined material, are disposed on a surface of a rod section. A detection head section is provided in proximity to the rod section, responds individually to the first pattern and the second pattern, changes its relation of correspondence to the respective patterns in accordance with it linear position with respect to the rod section and produces output signals in accordance with the relation of correspondence to the respective patterns. In accordance with the output signals corresponding to the respective patterns, first and secondd absolute position data of different ranges whose one cycle is constituted of one pitch of the respective patterns can be obtained. By combining these absolute position data, linear position of the detection head section with respect to the rod section can be specified in an absolute value. By disposing the first and second patterns in a mixed state on a single rod section, the construction of the device can be simplified.
REFERENCES:
patent: 2905874 (1959-09-01), Kelling
patent: 3041598 (1962-06-01), Betts
patent: 3171104 (1965-02-01), Norton
patent: 3286252 (1966-11-01), Bose
patent: 3505576 (1970-04-01), Burkhart
patent: 3534361 (1970-10-01), Foley
patent: 4556886 (1985-12-01), Shimizu et al.
patent: 4572951 (1986-02-01), Toda et al.
patent: 4717874 (1988-01-01), Ichikawa et al.
Ichikawa Wataru
Matsuki Yuji
Hoff Marc S.
Kabushiki Kaisha SG
Shoop Jr. William M.
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