Abstract: A displacement detecting device for optical head is disclosed which is capable of stably generating displacement detecting signals without being affected by fluctuation of wavelength of light emitted from a light source. The displacement detecting device is provided for use in an optical head which comprises a optical sensor for reading information recorded on an optical information recording medium by irradiating the optical information recording medium with light from a light source and detecting reflected light from the irradiated surface of the recording medium as well as detecting focus displacement and track displacement by utilizing diffracted light of the reflected light. The optical sensor is provided with wavelength fluctuation component detector for detecting wavelength fluctuation components in the reflected light.

Abstract: Disclosed is a monolithic ceramic capacitor comprising dielectric ceramic layers and inner electrodes wherein each dielectric ceramic layer comprises an essential component having a compositional formula of (1-.alpha.-.beta.)(BaO).sub.m TiO.sub.2 +.alpha.Y.sub.2 O.sub.3 +.beta.(CO.sub.1-x Ni.sub.x)O (where the alkali metal content of BaTiO.sub.3 is not more than 0.03% by weight, 0.0025.ltoreq..alpha..ltoreq.0.03, 0.0025.ltoreq..beta..ltoreq.0.06, 0<.beta./.alpha..ltoreq.6, 0<x.ltoreq.1, 1.000.ltoreq.m.ltoreq.1.035), and a side component consisting of, relative to 100 mols of the essential component, from 0.5 to 3.0 mols of MgO and from 0.05 to 2.0 mols of MnO, and from 0.2 to 3.0 parts by weight 100 parts by weight of the sum of the main component and the side component, of oxide glass of Li.sub.2 O--RO--(Ti,Si)O.sub.2 (where R indicates at least one of Ba, Sr, Ca and Mg). Also disclosed is such a monolithic ceramic capacitor where the Co is replaced by Zn and x is less than 1.

Abstract: A non-linear optical crystal element preferably of BBO or KDP arranged within a resonator for generating a light beam in the wavelength range of UV rays based on a radiated light beam of a basic wave. The non-linear optical crystal element is preferably hexahedral-shaped and has a protective film on its surface. The protective film is made up of at least two layers arranged on an incident surface and an outgoing surface of the non-linear optical crystal element. The layer of the protective film directly contacted with the incident surface or the outgoing surface is formed by ion plating.

Abstract: Camera apparatus for use with an automotive vehicle having a rear view mirror. The rear view mirror comprises a half-mirror, light reflected therefrom being visible to an occupant of the vehicle. A lens is disposed adjacent to the half-mirror and receives light passing through the half-mirror. An image pickup device is optically coupled to the lens and receives light passing therethrough to form an image signal corresponding to the received light.

Abstract: A connector includes a first member, a second member which is rotatably coupled to the first member, a first contact which is provided for a surface of the first member opposite to the second member, and a second contact, provided for a surface of the second member opposite to the first member, which is in contact with the first contact, the first contact and the second contact being relatively slid so that an electric connection can be maintained when the first member and said second member are relatively rotated.

Abstract: An automatic focus adjusting device in a camera system includes a focus detecting circuit for a focusing state of an object image formed on an image plane by a photographic lens, a control circuit for producing a control signal on the basis of an output of the focus detecting circuit and for outputting the control signal to the photographic lens to control the same, and a characteristic detecting circuit for detecting a predetermined optical characteristic of the photographic lens. The control circuit is arranged to transmit the control signal to the photographic lens by defining as a parameter a change of the optical characteristic detected by the characteristic detecting circuit.

Abstract: A motor for driving a moving member with respect to a member which serves as a reference of the movement includes at least two first piezoelectric actuators for operating an operating portion thereof such that it is brought into contact with and is moved away from said member, and at least one second piezoelectric actuator operating such that it changes a distance between the plurality of first piezoelectric actuators. At least one of the plurality of first piezoelectric actuators employs a bimorph type piezoelectric element.

Abstract: This invention pertains to a displacement detecting device for an optical head for detecting focal point displacement of irradiation light. The displacement detecting device has optical means for converting reflected rays from an irradiated face into an astigmatic bundle of rays and a photodetector for detecting a change in the the focused shape. The displacement detecting device thus detects focal point displacement of irradiation light. The optical means is obtained by integrally forming a plurality of Fresnel zone plates having rectilinear gratings, focusing reflected rays from the irradiated face, and having different focal lengths.

Abstract: A lens position control device for a lens system, including a variator and a compensator which also serves as the focusing lens, comprises a detecting circuit for detecting positions of the variator and the compensator, a memory circuit for storing a plurality of pieces of information representing the manners in which the movement of the compensator is to be controlled in accordance with the positions of the variator and the compensator detected by the detecting circuit, the information concerning with at least the speed and the moving direction, a first control circuit responsive to operation of the zoom actuator for controlling the movements of the variator and the compensator, the first control means controlling the movement of the compensator in accordance with the information stored in the memory circuit, and a second control circuit responsive to detection of when the continuously read two pieces of information read out from the memory circuit come to differ from each other in the moving direction for c

Abstract: An optical apparatus comprises a first lens to be used for changing a magnifying power; a second lens to be used for focus adjustment and also for compensation required when the magnifying power is varied; a focus detecting circuit for detecting an in-focus state; a first control circuit for driving the second lens to an in-focus position on the basis of information obtained by the focus detecting circuit; a detecting circuit for detecting the position of the second lens; and a second control circuit for driving the second lens to a normal focus adjustable position after driving the second lens to a reset position for the purpose of enabling the detecting circuit to perform a detecting action. The second control circuit is arranged to drive the second lens from the reset position to the focus adjustable position at a higher speed than the driving speed set by the first control circuit.

Abstract: A line concentrator used in a ring network system which has line concentrators for accommodating ring lobes, and a ring trunk cable connecting adjacent line concentrators, wherein a signal transmitted from an upstream line concentrator is sent via the ring trunk cable to the ring lobes of an immediately downstream line concentrator. The line concentrator is provided with a circuit for regenerating a signal on the ring trunk cable received by the line concentrator, and repeating and sending the regenerated signal to the ring lobes.

Abstract: In a LAN interconnecting apparatus having two transmitting and receiving sections connected to respective LANs, each of the transmitting and receiving sections can be set in either a first or a second operation mode by setting a register. The transmitting and receiving section copies and transfers relayed information frames in the first operation mode, but it does not in the second operation mode. The apparatus makes a unidirectional LAN interconnecting apparatus when one of the transmitting and receiving sections is set in the first operation mode and the other in the second operation mode, while it makes a bidirectional one when both of the transmitting and receiving sections are set in the first operation mode.

Abstract: An exposure apparatus for color cathode ray tube having a single faceplate with a phosphor screen on an inner surface thereof comprises light source device including an initial light source for emitting ultraviolet light, exposure device including a base for supporting the faceplate with a photosensitive layer having a plurality of sub-regions to form the phosphor screen, a plurality of secondary light sources emitting exposure light for exposing corresponding sub-regions and moving device for shifting position of the secondary light sources, and light distribution device for equally distributing a part of ultraviolet light emitted from the light source device to the secondary light sources.

Abstract: A position control device for a lens system having a variator and a compensator the latter of which also serves as the focusing lens, includes apparatus for detecting the positions of the variator and compensator, circuitry for detecting the focus state, and a processor for controlling movement of the compensator in accordance with at least the outputs of the position detecting apparatus and the focus detecting circuitry, wherein the second lens group is moved in a predetermined direction such that the image is forcibly slightly blurred.

Abstract: A method for performing a duplicated address test used for a network including a first ring transmission line, a second ring transmission line having a signal transmission direction opposite to that of the first ring transmission line, and a plurality of stations connected to at least one of these ring transmission lines. Each of these stations has a flag DAC representing whether or not the duplicated address test is performed, and some of the plural stations constitute a plurality of control nodes having a configuration function of the network. The flag DAC of each of the stations is reset at a time instant when a power source of this station is turned on, and also when any of the control nodes receives the sent out configuration control frame. Each of the stations having the reset flags DAC sents out the duplicated address test frame to either the first or second transmission line to which the station is connected when a token frame to control a transmission right is captured.

Abstract: A lens position control device for an optical instrument, the instrument including a variator and a compensator, the latter of which also serves as a focusing lens, comprises a detecting circuit for detecting the positions of the variator and the focusing lens, a memory for storing information representing the location and size of an impossible-to-focus zone for the focusing lens as the function of the zooming position of the variator, and a control circuit responsive to detection of the fact that the focusing lens falls in the impossible-to-focus zone on the basis of the information stored in the memory for causing the focusing lens to retire from the impossible-to-focus zone or for prohibiting the focusing lens from further moving in a direction toward the impossible-to-focus zone.

Abstract: A position control device for a lens system, the system including a variator and a compensator the latter of which also serves as the focusing lens, comprising device for detecting the degree of focus, device for detecting the positions of the variator and compensator, device for controlling movement of the compensator in accordance with at least the output of the position detecting device, and device responsive to occurrence of an out-of-focus state for correcting the manner in which the control device controls movement of the compensator, whereby the correcting device varies the manner between when the variator moves from the telephoto side to the wide-angle side and when from the wide-angle side to the telephoto side.

Abstract: In a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of line concentrators connected in the form of a loop by the two transmission lines and each accommodating a plurality of terminal stations connected to one of the two transmission lines, a signal detecting unit and a terminating circuit are disposed in each of the line concentrators on the signal output side of each of the transmission lines so as to be connectable to and disconnectable from the transmission lines, so that, when the signal detecting unit in one of the line concentrators is connected to the associated transmission line, the transmission line is disconnected in the line concentrator, and the terminating circuit is connected to the downstream segment of the disconnected transmission line.

Abstract: A lens position control device for a lens system, the lens system including a variator and a compensator which also serves as the focusing lens, includes a detecting circuit for detecting the position of the variator and the focusing lens, a memory for storing information representing a plurality of values of the speed of movement of the focusing lens determined depending on the positions of the variator and the focusing lens and a predetermined value of the speed of movement of the variator, and a control circuit responsive to zoom actuation for controlling the movements of the variator and the focusing lens. Depending on the information representing the positions of the variator and focusing lens determined by the detecting circuit, the control circuit selects a specific one of the values of the moving speed from the memory so that the focusing lens moves at the particular speed, and the movements of the variator and the focusing lens are started at almost the same time.

Abstract: This invention relates to a loop transmission system which has a plurality of stations connected to a loop transmission path to transmit data among the stations. In the transmission frame to be sent out from the sending station, specific information is included for identifying each frame and this information is held in the sending station. When the transmission frame returns to the sending station after being transmitted through the loop transmission path, the specific information in the frame is received and compared with the information held in the station and, if they coincide, it is decided that the transmission frame has been correctly received by the intended receiving station.