A magnetic transducer head having a coupling gap of controllable effective longitudinal dimension. In one embodiment a gap spacer of magnetic... Show moreA magnetic transducer head having a coupling gap of controllable effective longitudinal dimension. In one embodiment a gap spacer of magnetic material is energized by bias current and/or signal current during recording while being deenergized during playback to provide a larger coupling gap for recording than for playback. Recording gap size may be controlled dynamically, or a very high frequency bias current such as 100 mhz may be supplied to the magnetic gap spacer. A magnetic head may have a zero gap dimension when the magnetic gap spacer is deenergized to prevent any substantial residual external field. An electro-magnetic transducer head with the electric circuit portion including a path through the electrically conductive magnetic corepiece at the transducer gap, thus concentrating the gap field and mininizing core losses at very high bias or signal frequencies. Sponsorship: IIT Research Institute United States Patent Show less
A magnetic head is shown having auxiliary core material in a substantially unstressed condition with very low direct current coercivity and... Show moreA magnetic head is shown having auxiliary core material in a substantially unstressed condition with very low direct current coercivity and located within the working magnetic core for diverting magnetic flux due to residual magnetization of the main core of the head away from the record medium path. Crossfield magnetic heads, offset pole magnetic heads, and composite core magnetic heads with windings for different frequency ranges are also disclosed. Sponsorship: IIT Research Institute United States Patent Show less
A magnetic transducer system for selective audio or video operation with movable guides for shifting the tape path between audio, video, and... Show moreA magnetic transducer system for selective audio or video operation with movable guides for shifting the tape path between audio, video, and rewind positions, or with fixed guides defining both an audio and video tape path, the audio tape path being clear of the video head, for example. A video transducer with a receptacle removably receiving and providing external energization for a battery powered audio transducer unit. An audio/video cartridge transducer arrangement for selective operation with audio and video cartridges of different configuration, preferably using a common capstan element. Sponsorship: IIT Research Institute United States Patent Show less
A tape cartridge transducer machine compatible with existing tape cartridges but provided with a cartridge ejection leverage mechanism which... Show moreA tape cartridge transducer machine compatible with existing tape cartridges but provided with a cartridge ejection leverage mechanism which is actuated manually or by a solenoid to overcome the cartridge-biasing spring and shift the cartridge to an inactive standby position in the cartridge receiving space of the machine, after which the cartridge is manually removable with minimum effort. The machine preferably provides a balanced cartridge-biasing means to safeguard the cartridge against binding. Sponsorship: IIT Research Institute United States Patent Show less
A video tape cartridge of endless loop configuration capable of tape speeds suitable for longitudinal scan television recording while... Show moreA video tape cartridge of endless loop configuration capable of tape speeds suitable for longitudinal scan television recording while providing one hour or more of continuous playing time on one-quarter inch width tape. In an illustrative embodiment tape guides within the cartridge are shiftable from a loading position to an operating position without a substantial change in the length of the tape path to accommodate scanning of the tape at a tensioned loop closely adjacent the capstan. In operating condition, the tape is engaged with the capstan at one side thereof so that the capstan pulls tape along an incoming tape path from the inner side of the coil, the tape passing about the tensioned loop past the transducer head and again engaging the capstan for supply of the tape to the outer side of the coil along an outgoing tape path, with a tape drag applying a substantial drag force to the tape at the incoming tape path between the reel and the capstan. Sponsorship: IIT Research Institute United States Patent Show less
