Abstract: An analogue circuit or unit under test is tested utilizing automatic test equipment and an interface unit to apply stimuli to the circuit the stimuli including supply potentials. A computer analyses the circuit as a network of nodes and modules to deduce a set of ranges of values at selected nodes, the ranges being determined from the set of the stimuli and a resultant set of test measurements, taken from nodes of the circuit by the interface and automatic test equipment, taking into account tolerances in the stimuli, the measurements and the nominal parameters of components of the circuit. If there is inconsistency among the derived ranges the computer treats as potentially faulty any module which could remove the inconsistency if the constraints imposed by that module were suspended.

Abstract: A reproducing optical device for a magneto-optical recording medium related to the present invention having light sources that emit linearly polarized lights towards a magneto-optical recording medium, polarization directions of the linearly polarized lights being mutually orthogonal. A quarter wavelength plate disposed between the recording medium and the light sources converts each of the linearly polarized lights into right and left circularly polarized lights respectively. Corresponding to recorded information, the recording medium has magnetized sections that are magnetized in a perpendicularly upward and downward direction with respect to a medium surface. Moreover, the recording medium displays the property of circular dichroism.

Abstract: An image band-stop filter circuit includes a transmission line formed on a substrate of GaAs and a T circuit connected in parallel to the transmission line and having a high pass filter characteristic. The T circuit includes series-connected first and second capacitances connected in parallel to the transmission line and a stub having one end connected to a node between the first and second capacitances and the other end short-circuited. The stub has a line length which becomes inductive in an image signal band to be removed. As a result, the lengths of the transmission line and the stub can be reduced to enable the band-stop filter circuit to be made into a MMIC with ease while achieving an excellent signal transmission characteristic.

Abstract: A low pass filter using two pseudo gyrators 10 and 20 is disclosed. The gate-source capacitances of field effect transistors forming the pseudo gyrator circuit can be considered to be included in capacitors for forming the low pass filter. Therefore, an ideal admittance matrix for a gyrator is obtained. Increase in integration density of the low pass filter can be achieved since the low pass filter is formed by a simplified pseudo gyrator circuit.

Abstract: A device for automatically and continually monitoring the pH characteristic of a water based printing ink which uses a housing for a pH probe, which housing is placed in a flow line through which such ink is flowing, the housing having a main channel for ink flow and a recessed channel into which a pH probe member is inserted. A baffle is provided to direct a portion the flowing ink into the recessed channel in contact with the probe to continually monitor the pH of the flowing ink. A portion of the ink remains in the recessed channel when ink flow is stopped so that the probe surface is covered by the remaining ink and cannot dry out and reduce or destroy the effectiveness of the probe.

Abstract: An image density correcting device for a color copying machine capable of producing monochrome copies and full color copies, the device including a toner density detecting means for detecting the toner density of a toner image transferred on a transfer medium; a toner density storing means for storing a predetermined reference value for the toner density; a toner density comparing/judging means for judging the toner density of the image by comparing the toner density detected by the toner density detecting means with the toner density reference value stored in the toner density storing means; and a toner density correcting means for correcting the toner density of the image based on the result of the comparison and judgment by the comparing/judging means, wherein the toner density is corrected after a black toner layer is formed in any non-black color detectable by the toner density detecting means, of areas where black toner layers are formed for monochrome copying with black toner.

Abstract: A loudspeaker system using ribbon transducer elements wherein the ribbon elements of the high and mid-range transducer units form a plurality of conductive circuits separated by spaces, or cuts, therebetween which have substantially smooth, undulating wave forms. The magnetic circuit return paths thereof are arranged so as to be remote from and out of the transmitting paths of the acoustic signals generated at such units and the surfaces of the magnetic circuit components and a baffle structure associated therewith are shaped to reduce diffraction effects in the acoustic signals therefrom. A woofer ribbon element has a plurality of interconnected conductive circuit regions to form a generally serpentine shaped circuit, which regions are separated by channels, or cuts, each of which has a smooth, undulating wave form.

Abstract: The imaging apparatus which is provided with the image glossing device of the invention has a means for inputting or detecting a type of a receiver sheet. Transferring speed of the receiver sheet through a image glossing device after development process and temperature to which the receiver sheet is to be heated in the image glossing device are determined corresponding to the type of receiver sheet. For a receiver sheet which requires less quantity of heat for glossing, processing time can be reduced by setting relatively high heating temperature and high processing speed. For a receiver sheet which requires much quantity of heat for glossing, satisfactory glossing process can be performed without causing offset and other defects by setting relatively low heating temperature and low processing speed.

Abstract: A photomagnetic composite head comprising a magnetic head and an optical head that are integrated into one unit, an optical waveguide path of the optical head being located in the surface of the magnetic head that faces a recording medium, and a laser beam that passes through the optical waveguide path being irradiated on a point on the recording medium where a magnetic field is impressed from the magnetic head, whereby recording can be performed under a condition in which the coercivity of the recording medium has been lowered by the laser beam, thus making it possible to achieve high density recording by using a recording medium with a high coercivity.

Abstract: An optical unit including a lens and a mirror unit installed within an image forming apparatus, the lens and mirror unit moving together according to a desired power of magnification so as to expose a photoconductor to the light reflected from the original to form an image corresponding to the desired magnification, wherein the optical unit includes a cam device for moving the mirror unit, the cam device including a cam which is connected to a driving source and rotates according to the various power of magnification, and a cam follower which moves around the cam to reciprocate the mirror unit; and a lock means on the circumferential surface of the cam, the lock means engaging the cam follower to prevent the mirror unit from moving when a specific variable power of magnification is selected.

Abstract: An optical head, for an optical disk recording/reproducing apparatus, for irradiating a recording medium by a light beam emitted from a light source and introducing an information light formed by a light beam reflected from the recording medium to a photo detector, a shift of an optical axis of the information light being minimized. The optical head includes a unit for receiving the information light which is reflected from the recording medium, a first reflecting unit for reflecting such information light, a second reflecting unit for reflecting the information light reflected by the first reflecting unit and for directing the reflected information light toward the photo detecting system, and a unit for emerging the information light reflected by the second reflecting unit to the photo detecting system.

Abstract: A serial-to-parallel type A/D converter includes a resistance array, a plurality of comparators for upper bits, a plurality of comparators for lower bits, an encoder for upper bits, an encoder for lower bits and an adder. The resistance array divides a predetermined reference voltage to generate upper reference voltages, and by dividing the step width of the upper reference voltage, generates lower reference voltages. The plurality of comparators for the upper bits compare the analog input signal with the upper reference voltages, and applies the result of comparison to the encoder for the upper bits. The encoder for the upper bits calculates an estimated value of the upper bits based on the result of comparison, and select second reference voltages in the range provided by adding .+-.1/2 LSB to 1LSB corresponding to the estimated value of the upper bits. The plurality of comparators for the lower bits calculate the lower bits and a correcting bit based on the selected second reference voltages.

Abstract: A magneto-optical disk is provided with a transparent substrate of a disk shape, and a multiple layered structure which is formed on the substrate and includes a plurality of transparent dielectric films and magnetic recording films which are alternatively layered. One method of reproducing the magneto-optical disk is enabled, which has the steps of inputting a circularly or elliptically polarized light on the magneto-optical disk, and detecting an intensity change of the light caused by the magneto-optical disk due to the circular dichroism effect thereof, as a reproduced signal. Another method of reproducing the magneto-optical disk is also enabled, which has the steps of inputting a linearly polarized light on the magneto-optical disk, and detecting a rotation change of a polarization plane of the light caused by the magneto-optical disk due to the magnetic Kerr effect, as a reproduced signal.

Abstract: Air flows are jetted at leading edge of sheets from nozzles aligned along the widthwise direction of the sheets so as to separate the bottommost or uppermost sheet from the remaining sheets. When the sheets are large-sized, all the aligned nozzles form the air flows for separating the sheets. When the air flows from all the nozzles are jetted at the small-sized sheets, the sheets are liable to flap. Accordingly, the nozzles arranged near the both ends are closed, so that only the nozzles jetting the air flows to effectively separate the small-sized sheets are used.

Abstract: The present thermal printer provides a high-speed printing table and a low-speed printing table in addition to the thermal printing head containing dot heating elements and a switch for switching the printing mode. The high-speed printing table contains pulse widths matching to the printing hysteresis of the current to the Nth previous bit and the low-speed printing table contains pulse widths matching to the printing hysteresis of the current to the Mth previous bit, the M being smaller than the N. The printer further provides a printing control circuit and a central processing unit which operate cooperatively to determine the printing hysteresis of the current to the Nth or Mth previous bit, access to the necessary address locations for the pulse widths according to the printing hysteresis, and allow the current to pass through each necessary dot heating element for the time defined by the accessed pulse width.

Abstract: A silicon carbide semiconductor device is disclosed which includes a semiconductor substrate and a silicon carbide single-crystal layer formed above the substrate, the silicon carbide single-crystal layer having a device active region. The silicon carbide semiconductor device further includes an aluminum nitride single-crystal layer which is disposed between the silicon carbide single-crystal layer and the substrate. The aluminum nitride single-crystal layer functions as an electrically insulating layer by which the silicon carbide signale-crystal layer is isolated electrically from the substrate.

Abstract: A switching device which uses a pivotable switching element carrying a first magnet and a movable component carrying a second magnet mounted adjacent thereto, the north and south poles of the magnets being arranged so that, when the movable component is moved to a first location, the magnets attract and the pivotable element is in a first switch position and, when the movable component is moved to a second location, the magnets repel and the pivotable element is in a second switch position.

Abstract: An image forming apparatus in which a photosensitive sheet and an image receiving sheet are pressed together while being transported by a pressure developing device, the image receiving sheet being then separated from the photosensitive sheet by a separation roller. The pressure developing device continues to transport the photosensitive sheet after the image receiving sheet is separated therefrom, and the transportation of the photosensitive sheet by the pressure developing device is stopped when the trailing edge of the image receiving sheet has passed the separation roller.

Abstract: A first voice recognition apparatus includes a device for analyzing frequencies of the input voice and a device coupled to the analyzing unit for determining vowel zones and consonant zones of the analyzed input voice. The apparatus further includes a device for determining positions of articulation of an input voice determined from the vowel zones by calculating from frequency components of the input voice in accordance with a predetermined algorithm based on frequency components of monophthongs having known phonation contents and positions of articulation. A second voice recognition apparatus includes a device for analyzing frequencies of the input voice so as to derive acoustic parameters from the input voice. A pattern converting unit is coupled to the analyzing unit and uses a neural network for converting the acoustic parameters to articulartory vectors.

Abstract: A hologram scanner includes a reproducing light source for generating a collimated reproducing light beam, a hologram disk being adapted to rotate, and a hologram disposed on the hologram disk for deflecting the reproducing light beam by diffraction so as to scan an image surface by the deflected reproducing light beam during a rotation of the hologram disk. The hologram has interference fringes recorded by a mutual interference of an object light of divergent spherical wave and a reference light of divergent spherical wave. The object light is generated by an object light source positioned at a first position apart from a hologram recording plane of the hologram disk, on which the hologram is to be recorded, by a first distance. The reference light is generated by a reference light source positioned at a second position apart from the hologram recording plane by a second distance.