Blind person guide device
US4712003A · kind A · utility
Inventors
Key dates
| Filing date | Feb 24, 1987 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Feb 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is disclosed a blind person guide device comprising a walking stick, a source mounted on a front face of the walking stick for emitting a beam of infrared radiation in a forward direction, a photoelectric element mounted on the front face of the walking stick for receiving infrared radiation reflected from an object irradiated by the beam, an electric circuit for producing information as to a distance to the object based on the illuminance or energy of received radiation on the photoelectric element, an oscillator for generating electric vibrations having a frequency and an amplitude which are dependent on the distance information produced by the electric circuit, and a vibrator vibratable in response to the electric vibrations and having a vibrating surface against which a human skin can be pressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.