Positioning apparatus and movement sensor
US5291112A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Dec 7, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/18
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A movement sensor for a multi-bar positioner includes a first section having a curved corner reflector (76), a second section (70), and a third section with an analog position-sensitive-photodiode (84). The second section (70) has three LEDs (72, 82) and four photodetectors (74). Two of the LEDs (72) and the four photodetectors (74) face a first direction towards the corner reflector (76). The third LED (82) faces a second direction, different than the first direction, towards the position-sensitive-photodiode (84). The second section can be mounted on an arm of the positioner and used in conjunction with the first and third sections to determine movement or position of that arm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.