Abstract: A zoom lens barrel attains zooming by moving at least some lenses in the optical axis direction, has a cylindrical lens frame which holds the lenses on its inner circumferential surface side, is formed with a lens cam slot having a spiral shape about the optical axis, is formed with a straight slot extending in a direction parallel to the optical axis, and is movable in the optical axis direction. A cylindrical cam barrel is rotatable about the optical axis and is movable in the optical axis direction.

Abstract: In a video display control, a phase locked loop (PLL) circuit generates a multiplied frequency signal from a reference signal. The stability of the PLL circuit is maintained even when the reference signal has different frequencies by providing a number of multiplication values corresponding to the number of different reference signal frequencies and switching the multiplication value when a change in frequency is detected to stabilize the PLL circuit.

Abstract: A lens barrel has a manual focusing ring which is rotatable about the optical axis so as to attain a manual focusing operation, a focusing rotary cylinder which defines the position, in the optical axis direction, of a focusing optical system, and is rotatable about the optical axis, an auto-focusing power transmission member for directly transmitting the moving force from an auto-focusing power source to the focusing rotary cylinder, a free rotation cylinder which is arranged on the focusing rotary cylinder, and is rotatable about the optical axis, a manual focusing power transmission member for transmitting the moving force from the manual focusing ring, a power relaying member which constitutes a differential mechanism together with the manual focusing power transmission member and the free rotation cylinder, and applies the rotation driving force to the focusing rotary cylinder by receiving the moving force transmitted from the manual focusing power transmission member, and a locking member for locking th

Abstract: A zoom lens barrel has a first lens unit, a second lens unit sharing an optical axis with the first lens unit, a fixed barrel for containing the first lens unit and the second lens unit, a first lens unit shifting frame held in the fixed barrel so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the first lens unit, a second lens unit shifting frame held in the lens unit shifting frame so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the second lens unit, a zooming mechanism held by the fixed barrel so as to be rotatable around the optical axis for shifting the first lens unit shifting frame in the optical axis direction to perform zooming when the zooming mechanism is rotated around the optical axis, a focusing mechanism held by the fixed barrel so as to be rotatable around the optical axis for rotating the second lens unit shifting frame around the optical axis and shifting the second len

Abstract: The present invention discloses phenylimidazole derivatives having herbicidal activities, represented by general formula (I) ##STR1## (R.sup.1 and R.sup.2 each represent an alkyl group or the like; R.sup.3 represents an alkoxy group or the like; X is a hydrogen atom or a halogen atom; and two Ys each represent a halogen atom); processes for producing said derivatives; herbicidal compositions each comprising said derivative as an active ingredient; and a method for weed control, using said herbicidal composition.

Abstract: The present invention relates to a hydrazine derivative represented by the formula (I): ##STR1## (wherein each of Ar.sup.1 and Ar.sup.2 is a substituted or unsubstituted phenyl group, a substituted or unsubstituted heteroaryl group, or the like, R.sup.1 is an alkyl group or the like, and A is a divalent radical having --C.dbd.N--N-- or --CH--NH--N-- as a fundamental skeleton), which is a useful compound as an agricultural and horticultural insecticide.

Abstract: A display apparatus includes a display panel having a matrix electrode arrangement of intersecting scanning lines and data lines, a driving voltage generating means for supplying voltages to be applied to scanning lines to a scanning line driving means for driving scanning lines, as well as voltages to be applied to data lines to a data line driving means for driving data lines, at least one voltage level being supplied to the scanning and to the data line driving means, a switching means for turning on or off an electrical connection between the driving voltage generating means to a power source for supplying or disconnecting power to the driving voltage generating means, and a control means for controlling the scanning line driving means and the data line driving means such that a scanning signal voltage is applied to a scanning line to scan the same while a data signal voltage corresponding to image data is applied to a data line when the switching means is on, such that the one voltage level is supplied t

Abstract: A lens bodytube has an auto-focusing mode in which a photographing lens is automatically driven to an in-focus position by a drive force of a motor and a manual focusing mode in which the photographing lens is driven to the in-focus position by manually rotating a distance ring. A movable member is driven to a first position in the auto-focusing mode and to a second position in the manual focusing mode. When the movable member is at the first position, it is coupled to the motor to transmit a drive force of the motor to a rotary ring which drives the photographing lens along an optical axis. When the movable member is in the second position, it is coupled to the distance ring to transmit a manual drive force from the distance ring to the rotary ring.

Abstract: A lens barrel comprises a barrel body, inside and outside fitting members disposed within the barrel body at a predetermined interval in a direction along an axis thereof and each formed with a female screw, an inside lens holding frame having a male screw screwed into the female screw of the inside fitting member and an outside lens holding frame having a male screw screwed into the female screw of the outside fitting member. An external diameter of the male screw of the inside lens holding frame is larger than an internal diameter of the female screw of the outside fitting member. The male screw of the inside lens holding frame is segmented into a plurality of portions by a plurality of notches having an internal diameter smaller than the internal diameter of the female screw. The lens barrel also comprises a plurality of recesses formed in the outside fitting member and admitting passages of the plurality of segmented male screw portions of the inside lens holding frame.

Abstract: A lens barrel comprises a fixed barrel; a photographing lens which requires a first torque for driving the lens along the fixed barrel; and a surface wave motor including a fixed body and a moving body which is rotated relative to the fixed body by excitation for driving the lens. When the motor is not excited, a second torque is exerted between the moving body and the fixed body to prevent the relative rotation. The moving body is caused to rotate by a torque greater than the second torque. A friction generating device provided between the fixed barrel and the fixed body exerts a third torque to prevent relative rotation between the fixed barrel and the fixed body. The fixed body can rotate with respect to the fixed barrel only when the fixed body is caused to rotate by a torque greater than the third torque. A manual operation member drives the photographing lens by a manual operation; and a friction clutch provided between the manual operation member and the fixed body exerts a fourth torque.

Abstract: There is disclosed a zoom lens barrel of inner focusing type, simplified in structure by the use of a surface wave motor. There are provided two biasing members of different biasing forces, in such a manner that the stator member of the surface wave motor can rotate with respect to the fixed tube member and the movable member of the surface wave motor rotates integrally with the stator member in the zooming operation. Such structure allows to dispense with a mechanical clutch for selecting the focusing or zooming operation.

Abstract: A zoom lens system, with both zooming and focusing functions, has a plurality of lens groups including at least two focusing lens groups which move differently from each other either in zooming or in focusing, wherein when a certain movement trace for zooming is expressed with a variable of rotation angle of a rotating barrel for defining a displacement amount of a lens group along an optical axis, a movement trace of the first focusing lens group is formed by a combination of a first focus cam with a first compensating zoom cam, a movement trace of an n-th focusing lens group is formed by a combination of an n-th focus cam with an n-th compensating zoom cam, and a movement trace of each movable non-focusing lens group taking no part in focusing is formed by a combination of one of the first to n-th compensating zoom cams with a zoom cam for the non-focusing lens group.

Abstract: A connector including a first connector cover having a first engaging portion, a second connector cover having a second engaging portion for engaging with the first engaging portion and adapted to be mounted in a superposed manner on the first connector cover, plural contact members positioned between the first and second connector covers and having plural movable contact pins biased as to protrude from the external face of the first connector cover, and a conductive pattern bearing member positioned partly between the first and second connector covers and provided with conductive patterns on a face contacting the movable contact pins. The first connector cover is further provided with a third engaging portion, while the conductive pattern bearing member is provided with a fourth engaging portion for positioning the conductive pattern bearing member relative to the first connector cover by engagement with the third engaging portion.

Abstract: A lens barrel which can be easily switched between a manual focusing mode and an auto-focusing mode employs a motor as a drive power source for driving a switching apparatus for switching between an auto-focusing apparatus and a manual focusing apparatus. When a photographer supplies an external electrical signal, a switching operation from the auto-focusing apparatus to the manual focusing apparatus and vice versa can be performed in accordance with the forward/reverse rotational direction of the motor.

Abstract: A lens barrel comprises a fixed barrel; a photographing lens which requires a first torque for driving the lens along the fixed barrel; and a surface wave motor including a fixed body and a moving body which is rotated relative to the fixed body by excitation for driving the lens. When the motor is not excited, a second torque is exerted between the moving body and the fixed body to prevent the relative rotation. The moving body is caused to rotate by a torque greater than the second torque. A friction generating device provided between the fixed barrel and the fixed body exerts a third torque to prevent relative rotation between the fixed barrel and the fixed body. The fixed body can rotate with respect to the fixed barrel only when the fixed body is caused to rotate by a torque greater than the third torque. A manual operation member drives the photographing lens by a manual operation; and a friction clutch provided between the manual operation member and the fixed body exerts a fourth torque.

Abstract: A driving apparatus comprises a driving unit and a drive voltage generating unit. The driving unit includes a scanning electrode driver and a data electrode driver for driving an electrode matrix formed of scanning electrodes and data electrodes. The drive voltage generating unit includes a first means for generating a fixed voltage, a second means for generating a source voltage for providing drive voltages for driving the electrode matrix, and a third means for generating a first voltage equal to a subtraction of the fixed voltage from the source voltage and a second voltage equal to a subtraction of the source voltage from the fixed voltage. The first and second voltages are preferably controlled so as to vary depending on an external temperature.

Abstract: A display apparatus includes: a) a matrix electrode structure comprising a set of plural scanning electrodes and a set of plural data electrodes intersecting with the scanning electrodes; b) a scanning electrode driver for serially applying a scanning selection signal to the scanning electrodes and a data electrode driver for applying data signals in parallel; c) an address generator for serially generating an address signal for addressing a scanning electrode to which the scanning selection signal is to be applied and image signals for directing data signals to be sent to the data electrodes to the respective data electrodes; and d) a circuit for generating a signal for directing a changeover between a transfer of the address signal to the scanning electrode driver and a transfer of the image signals to the data electrode driver. The display apparatus is particularly adapted for partial rewriting.

Abstract: A lens barrel comprises a fixed barrel; a photographing lens which requires a first torque for driving the lens along the fixed barrel; and a surface wave motor including a fixed body and a moving body which is rotated relative to the fixed body by excitation for driving the lens. When the motor is not excited, a second torque is exerted between the moving body and the fixed body to prevent the relative rotation. The moving body is caused to rotate by a torque greater than the second torque. A friction generating device provided between the fixed barrel and the fixed body exerts a third torque to prevent relative rotation between the fixed barrel and the fixed body. The fixed body can rotate with respect to the fixed barrel only when the fixed body is caused to rotate by a torque greater than the third torque. A manual operation member drives the photographing lens by a manual operation; and a friction clutch provided between the manual operation member and the fixed body exerts a fourth torque.

Abstract: A display control unit is combined with a display device including X and Y side electrodes and a display element sandwiched between the X and Y side electrodes. The display control unit includes a plurality of lines for supplying voltages having different values to the X and Y side electrodes, a switch for connecting the lines with the electrodes or disconnecting the lines from the electrodes, and a unit for controlling the switch within a selection period of the X or Y side electrodes.

Abstract: A lens barrel is provided with a detecting device for detecting whether a clutch device for effecting the AF mode/MF mode changeover of a focus adjusting mechanism is changed over completely to either mode. When the detecting device detects that the changeover is not complete, as due to the supply of electric power from the camera body being cut off, the clutch device is automatically brought to the change-over position of a selected mode in response to the next supply of electric power.