Abstract: A vibration-type cantilever holder holds a cantilever opposed to a sample. The holder supports a main body part of the cantilever at only its base end so that a probe at the free end of the cantilever can contact the sample. The holder has a cantilever-attaching stand on which the main body part is placed and fastened such that the cantilever is tilted at a predetermined angle with respect to the sample. A first vibration source is fastened to the cantilever-attaching stand and vibrates with a phase and an amplitude depending on a predetermined waveform signal, and the first vibration source is fastened at a first location to a holder main body. A second vibration source is fastened at a second location, which is spaced from the first location, to the holder main body and generates vibrations to offset vibrations traveling from the first vibration source to the cantilever-attaching stand and holder main body.

Abstract: A composition of matter for the recording medium of nanometer scale thermo-mechanical information storage devices and a nanometer scale thermo-mechanical information storage device. The composition includes: one or more polyaryletherketone polymers, each of the one or more polyaryletherketone polymers having two terminal ends, each terminal end having two or more phenylethynyl moieties. The one or more polyaryletherketone polymers are thermally cured and the resulting cross-linked polyaryletherketone resin used as the recording layers in atomic force data storage devices.

Abstract: A disc drive carrier unit installed on an installation surface of a computer casing is proposed. The installation surface has at least a first positioning piece and a first fixation piece, and both are perpendicular to each other. The disc drive carrier unit has a frame for encompassing and securing a disc drive, a second positioning piece for engaging with the first positioning piece, and at least a second fixation piece for correspondently securing to the first fixation piece. The second positioning piece of the disc drive carrier unit has an engaging function to replace the partial locking design of the conventional technology, for ease of assembly/disassembly and reduction of the assembly cost.

Abstract: Disclosed is a multi-channel electrostatic sensor apparatus including a main oscillation circuit; a plurality of pull-in type sub-oscillation circuits which are adapted to synchronize with the main oscillation circuit to generate sub-frequency signals whose frequency is equal to the main oscillation frequency or a multiple thereof; and a plurality of resonance circuits which are sensitive to any change in exterior capacitance when detected by an associated detector for changing its resonator resonance point with respect to the sub-frequency signal. Positive synchronization of the sub-oscillation circuits with the single main oscillation circuit prevents any adverse effect from being caused by the varying stray capacitance in flexible conductors connecting the sub-oscillation circuits to the main oscillation circuit while allowing the relatively free movement of the video heads of a video system, on which video heads the sub-oscillation circuits and subsequent components are attached.

Abstract: A three-dimensional measurement system for measuring stator half coils includes a sonic digitizer which makes measurements of the stator half coil. These measurements are provided to a computing apparatus which converts the measured points to corresponding surface points on the surface of the stator half coil and combines the surface points into a measured shape. The measured shape is displayed on a display unit overlayed on the designed shape of the stator half coil for visual comparison of the two shapes. Preferably, the display is in color with different colors used for edges of the measured and designed shapes.

Abstract: A magnetic recording head apparatus includes: a magnetic head body opposing a travelling magnetic tape; a tuning circuit having the head body as a variable inductance element; a high-frequency signal source for generating a high-frequency signal; and a detector connected to the tuning circuit. The inductance of the head body is changed in accordance with a change in the magnetic signal field applied from the magnetic tape. The high-frequency signal is amplitude-modulated in accordance with the high-frequency signal. A peak or envelope waveform of the modulated high-frequency signal is detected by a detector, thereby obtaining a reproduced information signal.

Abstract: An improved resonator assembly employed in a capacitive pick-up assembly for use in a video disc system includes an oscillator and a resonator. The improved resonator comprises an electrode provided on a stylus for reading information carried on a disc as a track of the disc relatively moves past the stylus, a tuned line having a first end accommodated in a resonator cavity and a second end connected to the stylus electrode, a capacitive element connected between the first end of the tuned line and an inner face of the resonator cavity, and a bypass circuit connected between the tuned line and inner face of the resonator cavity. The bypass circuit has a high impedance with respect to a high frequency signal produced from the oscillator, whereby the bypass circuit cuts current flow of high a.c. component, but allows current flow of d.c. component.

Abstract: A capacitance detector for detecting the information recorded in the form of a series of microscopic pits on a capacitance disc record. The detector comprises, within an outer conductor, a dielectric support, an oscillator having a first line conductor on the support for generating microwave energy, a coaxial resonator having a second line conductor on the dielectric support, the second line conductor being coupled to the electrode of a capacitance detection stylus. Means are provided for inductively coupling the microwave energy from the oscillator to the resonator. This coupling means comprises a loop having a first section inductively coupled with said first line conductor and a second section inductively coupled with said second line conductor, and a capacitor connected from an intermediate point between the first and second sections to ground, so that the microwave energy coupled to the second line conductor is modulated in amplitude with capacitance variations corresponding to the microscopic pits.

Abstract: A capacitance detector for detecting a capacitance variation from a video disk and demodulating the capacitance variation into an electric signal, comprises a first block which includes a fixed oscillator, and a coupling loop comprised of a coupling coil and a coupling capacitor, the inductance of the fixed oscillator being inductively coupled with the coupling loop; and a second block which includes a disk stylus resonator having its resonance frequency varied by the capacitance variation of the video disk. A shield plate separates the first block from the second block and a coupling window is provided which inductively couples the coupling loop with the resonant inductance of the disk stylus resonator.

Abstract: An apparatus for detecting a variation of an electrostatic capacitance is advantageously utilized for reproducing information from a groove or pit formed on a disc of a CED type or a VHD type, for example, and comprises an oscillator and a resonance circuit each including a dielectric resonator, wherein the oscillator and the resonance circuit are capacitively coupled, while the resonance frequency of the resonance circuit is changed in accordance with a change of the electrostatic capacitance to be detected, whereby a signal output dependent on a variation of the electrostatic capacitance is obtained from a detector directly coupled to the resonance circuit.

Abstract: A signal pickup device for picking up signals from a video disc includes a base plate, a transducer unit printed on the base plate and having an oscillator, transformer, a resonator, an inductor, and a preamplifier mounted on the base plate and located longitudinally of the transducer unit. The preamplifier is of an elongated structure extending transversely of and substantially across the transducer unit. The oscillator and the preamplifier are supplied with electric power via a power supply terminal which is disposed substantially midway between the oscillator and the preamplifier. With this construction, the signal pickup device is reduced in width, and is of a unitary structure which can be easily positioned in place and results in high noise resistance.

Abstract: In a record playback system, such as a video disc player, there is tendency to radiate energy at a given frequency from the vicinity of the stylus where the stylus passes through the carriage bottom during playback. A first radial transmission waveguide path is provided in association with the carriage bottom. A second radial transmission waveguide path is provided between the carriage bottom and the record. The first and second paths are made to differ from one another by 180 electrical degrees. There is thus a reduction in radiated energy at the given frequency in the radial location which forms the common end of the first and second paths by signal cancellation at this common location.

Abstract: A rotary recording medium reproducing apparatus comprises a rotary recording medium in which an information signal is recorded as variations in electrostatic capacitance, wherein the rotary recording medium is rotated, a reproducing stylus for making contact with and relatively scanning over the recording surface of the rotary recording medium upon reproduction, having an electrode for detecting the information signal as variations in electrostatic capacitance, a reference potential part functioning as a reference potential point, a first direct-current connection path for connecting the rotary recording medium with the reference potential part for direct-current, and a second direct-current connection path for connecting the reproducing stylus with the reference potential part for direct-current. The second direct-current connection path including a signal pickup circuit.

Abstract: A stylus, having a conductive electrode, is arranged to follow a spiral groove on a disc in a video disc player. Video and audio information are recorded in the bottom of the groove as relief variations. When relative motion is established between the stylus and the groove, the spacing between the stylus electrode and relief variations provide capacitance variations representative of the recorded video and audio. A dual-gate field-effect transistor is used in a pickup circuit to detect signals related to these capacitance variations. One gate of the transistor is coupled to the stylus electrode to detect capacitance variations while the other gate is coupled to a local oscillator to modulate the detected capacitance variations.

Abstract: The invention describes a method and apparatus for reconditioning a video disc signal pickup stylus electrode to prevent electrode-disc electrical shorts. An AC or DC potential is repetitively applied during a predetermined period between the stylus electrode and the disc to produce electrical breakdown at the electrode-disc interface and vaporize a portion of the electrode material. In the capacitive type video disc system, the capacitance sensing pickup circuitry is repetitively tuned to couple excessive amounts of rf potential to the stylus electrode.