Pittman's 35mm ROSE (Reflective Optical Sensing Encoder) is an incremental, noncontacting rotary to digital feedback device. The encoder translates real-time shaft angle, speed and direction of rotation into TTL -compatible outputs. The outputs are two-channel, in quadrature with medium resolution encoding performance. The encoder is a less expensive, flexible alternative to the Agilent HEDS-9100 family of products. However, it is not intended to be a direct replacement in all applications.
The encoder’s innovative PC board based design and multi-tracked code discs offers a wide range of resolutions and integral value added features. This concept achieves all the various features while using a minimum number of manufactured parts. The PC board is comprised entirely of surface mount (active and passive) components. Signal conditioning options such as an RS -422 differential line driver, pull-up resistors and additional filtering capacitor are all surface mount. The PC board also allows flexibility of low tooling costs and quick turnaround to accommodate custom control electronics.
The encoder employs a variety of proven design features such as a solid snap-together mounting base and cover that minimize weight and mounting hardware. In addition, it features a robust metal code disc hub with a set screw
for simple and reliable gap setting. The reflective code disc itself is constructed of laminated photographic emulsion and Mylar. The result is a low cost, durable disc that has precise window to bar ratios.
ROSE Encoder
