Title:
DEVICE FOR PREVIOUSLY NOTIFYING SET ANGLE VALUE OF DIGITAL TRANSIT
Document Type and Number:
Japanese Patent JPH03142313
Kind Code:
A
Abstract:
PURPOSE:To previously notify the coincidence between a detected angle value and a set angle value by generating a signal at the time of approaching the detected angle value to the prescribed set angle value. CONSTITUTION:Angle signals detected by photodetectors 22 and 23 are amplified by amplifiers 30 and 31, and pass through comparators 32 and 33 and a direction discriminating circuit 34, and are counted by a counter 35. The pulse counted value is converted by a pulse-angle converting circuit 36 and is displayed on a device 37 as the detected angle value. The set deviation value preliminarily inputted by an angle setter 8 is converted to upper and lower limit angle values by a deviation setter 38, and they are inputted to registers 39 and 40. A comparator 41 compares the output of the counter 35 with the upper limit angle value from the register 39, and the comparator 41 outputs a signal in the high level when the former is smaller. A comparator 42 compares the output of the counter 35 with the lower limit angle value from the register 40, and the comparator 42 outputs a signal in the high level when the former is larger. When the detected angle value is between upper and lower limit angle values, an exclusive OR gate 43 outputs a signal in the high level, and an advance notice signal generator 44 gets the signal in the high level to generate a notice signal.
Inventors:
SASAKI TSUNEO
OTANI YASUHIRO
OTANI YASUHIRO
Application Number:
JP25918090A
Publication Date:
June 18, 1991
Filing Date:
September 28, 1990
Export Citation:
Assignee:
TOPCON CORP
International Classes:
G01C1/06; (IPC1-7): G01C1/06
Domestic Patent References:
| JPS58105010A | 1983-06-22 |
Attorney, Agent or Firm:
Minoru Nakamura (3 others)