Abstract: A multi beam track system and method is used for the retrieving of information stored in optical memories like optical disks. The information carrying beams reflected on the surface of such a optical disk results in spots on the surface of a detector array. Because these beams are very close to each other, the resulting spots tend to overlap so that cross talk conditions between neighboring channels occur. As result the S/N ratio becomes worse. According to the present invention a plurality of laser beams arranged in a row is used, where the laser beams are linear polarized and the polarization of neighboring beams differ by 90.o slashed., i.e. neighboring laser beams have perpendicular linear polarization. After reflection on the surface of the optical disk the row of reflected laser beams is separated into two rows by an separating means which is polarization dependent so that beams are separated in space according to the polarization.

Abstract: The invention concerns a high storage capacity ROM-RAM disk and a process for reading and writing to the ROM-RAM disk. T he aim of the invention is to devise a ROM-RAM disk and a process making it possible to read ROM and RAM simultaneously, to read the ROM area and at the same time write to the RAM area and to provide the largest possible volume of memory. The invention comprises two alternative designs. In a first design a ROM-RAM disk contains an area having both ROM and RAM memory structures as of a certain radius or diameter, establishing therein, at a constant rotational speed, a scanning/writing speed which ensures a reading/separation of the data stored in the ROM-RAM structures. In a second design, the available storage area is taken up entirely by a ROM-RAM storage area, where RAM memory structures have a reduced data rate in order to form, a length of memory structures necessary for separating the data stored in the ROM-RAM storage area.

Abstract: In laser feedback systems of an optical memory the most suitable feedback gain value depends on the type of optical disks used. According to the invention a system and a method is provided which finds by way of an iteration a suitable maximum feedback gain value so that the feedback system does not oscillate. The method consists in starting with a low gain value for driving a laser diode, increasing the gain value by small amounts until an oscillation detecting unit detects that the laser feedback system is oscillating. Then the gain value is reset to the previous value or a little bit more. Then the laser feedback system is again in a non-oscillating area with a suitable maximum gain value. This iteration is performed by a system consisting mainly of a laser diode, a photodiode for detecting the reflected light, and an oscillation detecting unit which controls a gain controller. This gain controller sets the gain on a multiplier which drives the laser driver for the laser diode.

Abstract: A display device to be worn by the user on his or her head comprising a pair of left and right image display members which are arranged on a frame to be put on a head of a user in a manner enabling them to be moved in a direction toward or away from each other; a pair of left and right lens members on the frame which show virtual images of the images displayed by the image display members to the user, the light axes of which being made substantially parallel to each other at a position on a light path extending from the left image display member to the left eye of the user and at a position on a light path extending from the right image display member to the right eye of the user, in a manner enabling them to be moved in a direction toward or away from each other; and a link mechanism member for variably adjusting the distance in the horizontal direction between the lens members so to adjust the distance in the horizontal direction between the image display members linked with the adjustment of the distance b

Abstract: A magneto optical disc system includes a disc having permanently recorded tracks overlain with magneto optical recording material. Data is recorded in the magneto optical material in tracks superimposed over the permanently recorded tracks, using the read-only data to define magneto optical tracks. The magneto optically recorded data is correlated with the prerecorded data for defining the location of data stored in the magneto-optic tracks.

Abstract: To relieve fatigue of viewer's eyes, a binocular display system is equipped with a mechanical or electrical adjusting section for minimizing a separation between left and right virtual images for the left and right eyes. The adjusting section holds the arrangement of the four positions of left and right lenses (or curved mirrors) and left and right pictures produced by at least one display device in such a manner as to reduce the separation between the left and right virtual images of the left and right picture substantially to zero, and/or adjusts the arrangement of these four positions to move the left and right virtual images in a desired direction so that the left and right images remain optically coincident.

Abstract: A method and apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet solvent tank to thereby increase or decrease a concentration of MEK in the wet solvent used as a primary solvent for initially mixing with the stock oil.

Abstract: An apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet solvent tank to thereby increase or decrease a concentration of MEK in the wet solvent used as a primary solvent for initially mixing with the stock oil.

Abstract: A paper coating composition which comprises:(I) a pigment;(II) an aqueous binder;(III) a mixture or a reaction product ofa water-soluble resin (A) which can be obtained by reacting, at least, (a) an alkylenediamine or a polyalkylenepolyamine, (b) an urea compound and (c) a compound selected from aldehydes, epihalohydrins and .alpha.,.gamma.-dihalo-.beta.-hydrins; andan amide compound (B-1) which can be obtained by reacting (x) an .alpha.,.beta.-unsaturated carboxylic acid compound and (y) a primary or secondary amino compound, oran aminonitrile compound (B-2) which can be obtained by reacting (z) an .alpha.,.beta.

Abstract: A glasses type head mounted display apparatus for seeing a virtual image through left and right lens systems provided with corresponding left and right display portions displaying left and right pictures, respectively. The display apparatus includes left and right slide mechanisms for moving the respectively left and right display portions on the main point axes of the lens systems and on segment lines through the central points of the left and right lens systems and focuses of the left and right lens systems so that the user sees through the left and right lens systems a virtual image synthesized with pictures of the left and right display portions.

Abstract: A system for reducing noise in a data recording/play-back device includes an optical system for scanning a recording medium and providing first and second polarization signals. The polarization signals are added to provide an added signal. The added signal is differentiated to provide a noise reduction signal. The polarization signals are substracted to provide a difference signal. The differentiated signal is substracted from the difference signal to provide a data signal having a substantially reduced noise level.

Abstract: A learning system is used in a data processing apparatus for learning an input pattern by obtaining an internal-state value necessary for realizing a desired data conversion by performing a pattern conversion defined by the internal-state value and calculating an output pattern corresponding to the input pattern.

Abstract: A learning process system is provided for a neural network. The neural network is a layered network comprising an input layer, an intermediate layer and an output layer formed of basic units. In the basic units, a plurality of inputs is multiplied by a weight signal and the products are accumulated, thereby supplying the sum of products. An output signal is obtained using a threshold value function in response to the sum of products. An error signal is generated by an error circuit in response to a difference between the output signal obtained from the output layer and a teacher signal. A weight updating signal is determined in a weight learning circuit by obtaining a weight value in which the sum of the error values falls within an allowable range. Thus, the learning is performed in the layered neural network through use of a back propagation method.

Abstract: A learning system is used in a data processing apparatus for learning an input pattern by obtaining an internal-state value necessary for realizing a desired data conversion by performing a pattern conversion defined by the internal-state value and calculating an output pattern corresponding to the input pattern.

Abstract: One end portion of a lug detecting lever or cassette detecting lever is arranged at the position of a safety lug of a cassette loaded on a tray unit or at the position of the cassette. The pivotal position of the other end portion of this detecting lever is varied in accordance with the presence/absence of a safety lug or a cassette. During insertion of the tray unit into a housing, a shutter mechanism is rendered operative or inoperative in accordance with the pivotal position of said detecting lever. The shutter mechanism is associated with a tape end detecting element. Upon receiving a detection signal from this tape end detecting element, a controller can determine the presence/absence of a safety lug or a cassette.

Abstract: An optical apparatus using a display device is comprised of a lens system having an optical axis, a display device for displaying a video image on the optical axis, a beam splitter for splitting information of visual image, the beam splitter being formed so as to incline an angle of about 45 degrees relative to the optical axis and located under the lens system, and a shutter device disposed in front of the beam splitter for controlling transmission of image from the surrounding, wherein the video image is shown as a virtual image with the image from the surroundings when viewer peeps the video image from the back of the beam splitter.

Abstract: An electromagnetic reciprocating pump comprises a pressure sensor for detecting the actual outlet pressure of the electromagnetic reciprocating pump, and the strokes of the electromagnetic drive means and the compressor piston connected to the electromagnetic drive means varies are feedback controlled by the deviation from the present outlet pressure of the actual outlet pressure detected by the pressure sensor. The stroke of the electromagnetic drive means is controlled by adjusting the average magnitude of the half-wave AC current supplied to the electromagnetic drive means.

Abstract: An electromagnetic reciprocating pump which maintains the outlet pressure at a preset value comprising a pressure sensor for detecting the actual outlet pressure of the electromagnetic reciprocating pump and means to feedback control the frequency of the reciprocating motion and, if necessary, its stroke of the electromagnetic drive means based on the deviation from the preset outlet pressure of the actual outlet pressure. The reciprocating motion frequency control of the electromagnetic drive means may be done by modulating the frequency and amplitude of the half-wave AC current supplied to the electromagnetic drive means. With this, the control of the number of times of the reciprocating motion of the electromagnetic drive means can be carried out without changing the reciprocating motion stroke of the electromagnetic drive means.

Abstract: Control system for driving a synchronous motor at a speed greater than a rated speed with a rotational speed detector for the rotor mounted on the motor, rotational position detector for detecting the rotational position of the field pole of the motor, an error signal generator which produces the difference between a desired speed signal and an actual rotational speed signal, and a calculating device for calculating armature current component values Id, Iq and power-factor .phi..