Spectra Precision Focus 30 Service Manual

Chapter 3
Theory of Operation
P/N 79000035_SM, Version 1.5 3 - 27 Focus 30/35 Service Manual
Fig. 3-25 Section view angle sensor
The coarse code placed on the inner circle on the glass disc works like a bar code, the CMOS sensor
will identify the coarse position of the circle. The fine code placed on the outer circle of the glass disc
is an incremental code. By reading the coarse and the fine code an angle can be generated.
Fig. 3-26 Coarse and fine code of the anglr disc
The information from the both CMOS sensors will be calculated in the Angle control board into an
angle.
The final angle correction will be done in the MCB board.
CMOS sensor
Glass circle
Angle control board
LED Laser
LED Laser
Pattern
Pattern
Fine code
Coarse code

Spectra Precision Focus 30 Specifications

General

Brand	Spectra Precision
Model	Focus 30
Category	Measuring Instruments
Language	English