Portable memory device
US4449206A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1981 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Dec 4, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C7/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A small portable memory device has optical connectors except for those connecting with an external power source. The memory device incorporates a semiconductor memory and information such as address and data information are applied externally by means of light beams. The light signals applied to the device are converted into electrical signals by phototransistors and the address and data information applied externally, one bit at a time, are temporarily stored in a shift register incorporated in the device. When the received input attains a predetermined number of bits, the semiconductor memory is accessed to effect the writing or reading of data. When reading the data, electrical signals indicative of the data to be read are converted into light signals by a light-emitting diode and are delivered from the device in the form of light signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.