Combination of reproducing heads and a rotary transformer device
US4639805A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1983 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Nov 22, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/53
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotary transformer is employed in a 4-head type recording and/or reproducing apparatus which has a rotary body which is wrapped with a magnetic tape, and four heads mounted 90.degree. apart from each other on the rotary body for recording and/or reproducing a video signal onto and/or from the tape. The rotary transformer device comprises a rotary core which has five circular grooves formed in one surface thereof and is rotated unitarily with the rotary body, a first short-circuiting ring embedded in a center groove among the five grooves of the rotary body, first through fourth ring-shaped coils embedded in the remaining four grooves of the rotary body, a stationary core which is stationary at a location separated from and opposing the rotary core and has five circular grooves, a second short-circuiting ring embedded in a center groove among the five grooves of the stationary core, and fifth through eighth ring-shaped coils embedded in the remaining four grooves of the stationary core. The first and second ring-shaped coils which are located on one side with respect to the first short-circuiting ring, are coupled to one pair of mutually opposing heads among the four heads. The th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.