| ReturnTo Theme-Group-Choice | Onelevelup |
| 5D091 | Recording or reproducing by magnetic means (1) | |
| G11B5/00 -5/024,604@Z | ||
| G11B5/00@A-5/00@G;5/00@Z;5/008@A-5/012;5/02@A-5/02@Z | AA | AA00 RECORDING AND REPRODUCING DEVICES |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | AA08 | AA09 | AA10 | |
| . Magnetic tapes | . . Fixed-head types | . . Rotary-head types | . . . Videotape recorders (VTR) | . . . . Eight-millimeter videotape recorders | . . . Digital audio tape devices (DAT) | . Magnetic disks | . . Flexible-disk types | . . Hard-disk types | ||||
| AA11 | AA12 | AA20 | ||||||||||
| . Magnetic cards | . . Magnetic cards having strip-like recording sections | . Other recording and reproducing devices | ||||||||||
| BB | BB00 RECORDING SIGNALS |
BB01 | BB02 | BB03 | BB04 | BB05 | BB06 | BB07 | BB08 | BB10 | ||
| . Voice signals | . . Digital voice signals | . Video signals | . . Digital video signals | . . Still pictures | . Data signals (i.e., excluding sound or video signals) | . Control signals | . . Control signals in drive systems | . Other recording signals | ||||
| CC | CC00 RECORDING METHODS |
CC01 | CC02 | CC03 | CC04 | CC05 | CC07 | CC09 | ||||
| . In-plane recording by magnetization | . . Head and media characteristics | . . . Head material characteristics | . . . Head structure characteristics | . . . Media material characteristics | . . Transverse recording | . Diagonal recording | ||||||
| CC11 | CC12 | CC13 | CC14 | CC15 | CC17 | CC18 | CC19 | CC20 | ||||
| . Vertical recording | . . Vertical recording heads | . . . Recording by ring heads | . . Recording after erasing | . . Recording circuits | . Magneto-optical recording | . . Bias-magnetic-field modulation | . . . Control of bias magnetic field | . . . . Control that is independent of the optical system | ||||
| CC21 | CC22 | CC23 | CC24 | CC26 | CC27 | CC28 | CC30 | |||||
| . . . Overwriting recording | . . . . Overwriting recording using a permanent magnet | . . Optical-modulation types | . . Magneto-optical heads | . Recording by special methods | . . Recording by permanent magnetization | . . Recording using a superconductive element | . Other recording methods | |||||
| DD | DD00 REPRODUCING METHODS |
DD01 | DD03 | DD04 | DD05 | DD06 | DD07 | DD08 | DD09 | DD10 | ||
| . Ring-type heads | . Use of magnetic-resistance effects | . . Application of a direct current bias | . . Application of a alternating current bias | . . Applicatioon of a pulse bias | . . Bias control | . . Multi-track heads | . . Detection of a reproducing signal | . . . Protection circuits | ||||
| DD11 | DD13 | DD14 | DD16 | DD18 | DD20 | |||||||
| . Use of Hall effects | . Resonance with head inductance | . . Parametric oscillation | . Detection of magnetic bubbles | . Reproducing of permanent magnetization | . Reproducing of a vertical recording signal | |||||||
| DD30 | ||||||||||||
| . Other reproducing methods | ||||||||||||
| EE | EE00 CIRCUIT CONFIGURATION OF THE ROTARY HEAD SYSTEM |
EE01 | EE02 | EE03 | EE04 | EE05 | EE06 | EE07 | EE08 | EE09 | EE10 | |
| . Rotary transformers | . . Transformer shapes | . . . Coaxial types | . . . Plane types | . . Transformer arrangements | . . . Transformer mountings | . . . . Transformer spacing adjustment | . . Plural transformers | . . Arrangements of windings to prevent crosstalk | . . Transformers for a rotary erase head | |||
| EE11 | EE12 | EE13 | EE15 | EE16 | EE17 | EE18 | EE19 | |||||
| . Signal transmission by optical means | . . Means for emitting light | . . Means for receiving light | . Slip-ring structure | . . Brushes | . . . Transmission of control signals | . . . Transmission of power signals | . . . Transmission of information signals | |||||
| EE21 | EE22 | EE23 | EE24 | EE25 | EE26 | EE27 | EE28 | EE29 | EE30 | |||
| . Rotary head circuits | . . Connections between the head terminal and rotary transformer | . . . Impedance-matching between magnetic heads and rotary transformers | . . Amplifiers in a rotary drum | . . . Application of power to an amplifier in a rotary drum | . . . . Applying of power by rotary transformer | . . . . Application of power by slip ring | . . . . Power-generation mechanisms | . . . . Use of solar cells | . . . Stabilizing circuits in a rotary drum | |||
| EE31 | EE32 | EE33 | EE34 | EE36 | EE38 | EE40 | ||||||
| . . . Mode-switching from recording to reproducing | . . . Means for preventing heat generation in an amplifier rotary drum | . . . Grounding of terminals | . . . Arrangements of amplifiers | . Connections between the fixed drum and outside | . Transmission of multiplexed signals | . Others | ||||||
| FF | FF00 OTHER CONFIGURATIONS |
FF01 | FF02 | FF03 | FF04 | FF05 | FF07 | FF08 | FF10 | |||
| . Measuring, testing, and inspection | . . Measuring, testing, or inspection of media | . . Inspection of media durability | . . Inspection of the head | . . Testing or inspection of recording and reproducing devices | . . Recording media for adjustment | . . . Adjustment tapes | . Software-signal-recording media | |||||
| FF11 | FF13 | FF15 | FF20 | |||||||||
| . . Control-signal-recording media | . Remote control | . Equalizers | . Others | |||||||||
| GG | GG00 MEDIA RECORDING PATTERNS |
GG01 | GG02 | GG03 | GG05 | GG06 | GG07 | GG08 | GG09 | GG10 | ||
| . Single-layer recording | . . Azimuth recording between adjacent tracks | . . . Multi-azimuth-head recording | . Multi-layer recording | . . Two-layer recording | . . . Azimuth layers | . . . Deep-layer-recording servo signal | . . Surface-layer erasing | . . After-recording | ||||
| GG11 | GG13 | GG15 | GG17 | GG18 | GG19 | GG20 | ||||||
| . . Charging bias to the deep-layer signal | . . Three-layer recording | . Dual-side recording media | . Track arrangements on recording media | . . Reciprocating recording | . . Multi-channel recording on multiple tracks | . . . Split-signal recording | ||||||
| GG21 | GG22 | GG24 | GG25 | GG26 | GG27 | GG28 | GG30 | |||||
| . Fixed heads | . . Multiple heads | . Head driver characteristics | . . Single head | . . Multiple heads | . . . Two heads | . . . Four heads | . . Zigzag recording | |||||
| GG31 | GG33 | GG40 | ||||||||||
| . . . Sheet recording | . Disk-recording patterns | . Other recording patterns | ||||||||||
| HH | HH00 PURPOSE AND EFFECTS |
HH01 | HH02 | HH04 | HH06 | HH08 | HH09 | |||||
| . Prevention of false data production | . Copying prevention | . Data protection | . Crosstalk protection | . Noise elimination | . . Muting | |||||||
| HH11 | HH13 | HH15 | HH17 | HH19 | HH20 | |||||||
| . Temperature maintenance | . Control levels | . Static electricity prevention | . Dust protection | . Timing axis correction | . Other objectives or effects | |||||||
| JJ | JJ00 USES |
JJ01 | JJ02 | JJ04 | JJ05 | JJ06 | JJ07 | JJ09 | ||||
| . Broadcasting | . . Broadcasting of programs | . Guides | . . Train or bus guides | . . Use of voice synthesis | . . Automatic door guides | . Telephone-answering machines | ||||||
| JJ11 | JJ12 | JJ13 | JJ15 | JJ16 | JJ17 | JJ18 | ||||||
| . Teaching guides | . . Head arrangements to prevent crosstalk from recording head to reproducing head | . . Characteristic recording direction | . Data recorders | . . Time codes | . . Timing signals | . . . Trigger signals | ||||||
| JJ21 | JJ25 | JJ30 | ||||||||||
| . Card readers | . Transfer between recording media | . Other usages |