Fluorescent indicator
US4322758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1980 |
| Grant date | Mar 30, 1982 |
| Priority date | — |
| Expiry date | May 1, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention pertains to a fluorescent indicator adapted to indicate a level of a signal to be measured in an acoustic instrument and/or a vertical condition of a magnetic head in a multi-channel tape recorder. The fluorescent indicator comprises a fluorescent indicating tube having a plurality of segment anodes arranged in a row from a lowest level side to a highest level side, pulse generator means to generate clock pulses having the number of pulses corresponding to the level of a signal, and counter means including a plurality of output terminals connected to the respective segment anodes to have output signal sequentially generated corresponding to the count of the clock pulses to operate the segment anodes of the fluorescent indicating tube. The fluorescent indicating tube starts to be operated on starting to count the clock pulses and the segment anodes of the fluorescent indicating tube are sequentially operated from the lowest level side toward the highest level side as the signal level becomes higher. The fluorescent indicator may be applied to a tape recorder having a multi-channel magnetic head and may further comprise a phase difference detector to electrically detec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.