Blind guide device
US4648710A · kind A · utility
Inventors
Key dates
| Filing date | Apr 30, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S135/911
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Blind guide device is disclosed. The device comprises a light-emitting element, a first electric circuit for generating an electric pulse and causing pulsating-conduction of the light-emitting element, a first lens for converging the light emitted from the light-emitting element onto a body to be detected, a mark attached to the body to be detected for performing retroreflection action, a second lens and a photo-detector element for receiving the light reflected by the body to be detected and the mark, a second electric circuit for amplifying the output electric signal of the photo-detector element and holding an electric signal synchronized with the electric pulse, a third electric circuit for generating an electric signal whose frequency or amplitude varies in response to the output electric signal of the second electric circuit, and an electro-acoustic transducer or vibrator for converting the output electric signal of the third electric circuit into a sound or into a stimulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.