Abstract: The present invention provides a mono-component developer comprising toner particles containing a binding resin, a colorant and an additive and a method of forming images by use thereof. In the present invention said additive is preferably a titanium compound prepared by through the reaction between TiO(OH).sub.2 and a silane compound or through the reaction between TiO(OH).sub.2 and a silicone oil. The specific gravity of the said titanium compound is in the range of 2.8 to 3.6. The average particle diameter thereof is in the range of 10 to 70 nm. The said toner particle is preferably a non-magnetic particle. By making use of the mono-component developer and the method for forming an image using it, charging of the toner, and carriage of the toner can be stabilized over a long period of time, and stable image formation can be obtained.

Abstract: Disclosed is a developer comprising a carrier including, on a core, a resin coating layer in which an electroconductive material is dispersed in a matrix resin and a toner composition including toner particles containing a binder resin and a colorant, and, as an external additive, a titanium compound produced by a reaction of TiO(OH).sub.2 with a silane compound. Also disclosed is an image forming method using the developer. According to the invention, the charge property can be improved and fluctuation in the charge property caused by environmental change can be avoided.

Abstract: A toner for developing an electrostatic latent image, which comprises toner particles and treated titanium oxide fine particles obtained by coating titanium oxide fine particles with 0.1 to 2.0% by weight, in terms of Al.sub.2 O.sub.3, of aluminum or Al.sub.2 O.sub.3 and further subjecting the coated particles to surface treatment with a treating agent.

Abstract: According to a first aspect of the invention, an optical position sensor employs a position encoder having collimators and reflectors with mutually aligned optical axes mounted in a support. A slotted code plate moves between the collimators and reflectors in a plane non-perpendicular to their optic axes. This encoder converts position to optical signals reliably, regardless of mechanical shock or vibration. According to a second aspect of the invention, an optical position sensing system employs wavelength-division multiplexing to distribute light pulses to different position encoders and time-division multiplexing to further distribute pluses to the collimators in each encoder. This permits multiple position encoders to be served by a single light source and optical fiber.

Abstract: A disc drive for performing writing information on and/or reading out information from a disc has a head, a movable member, a driving device, a restriction device and a release device. The head writes information on and/or reads out information from the disc. The movable member supports the head. The driving device moves the movable member. The restriction device fixes the movable member in a predetermined position in a moving path of the movable member by using a magnetic attractive force. The release device releases the movable member from the fixed state at the predetermined position by using a magnetic repelling force.

Abstract: A toner for developing an electrostatic charge image is disclosed, which is formed by adding and mixing an external additive with toner particles having an average particle size of not larger than 9 .mu.m and comprising at least a colorant and a binder resin, wherein the external additive is fine particles having a particle size of 20 to 80 nm. There is also disclosed a process for preparing the toner which comprises adding external additives to the toner particles and mixing them, wherein the addition and mixing of said external additive are carried out under specific conditions.

Abstract: An electrophotographic two-component system developer is described, comprising a positive charging toner and a negative charging carrier of the dispersed magnetic powder type, wherein a hydrophilic alumina particle is adhered onto the surface of said positive charging toner and a negative charging carrier has a volume average particle diameter of from 30 to 80 .mu.m. The developer provides reduced toner cloud upon development processing and provides toner images free from fog.

Abstract: A positively chargeable electrophotographic developer is disclosed, comprising a carrier, toner particles positively chargeable by friction with the carrier, fine particles of hydrophilic alumina, and fine particles of one of tin oxide, hydrophobic silica and titanium dioxide. The developer hardly undergoes toner cloud or toner dropping during development and suffers neither extreme deterioration in charging properties nor fog formation even when used for taking a large number of copies.

Abstract: A camera comprises a box-shaped housing open on the back side and including a front wall, end walls, a bottom wall and a top wall; an exposure chamber formed integral with said bottom wall at a central area thereof and open on the back side to provide an exposure window; a film cartridge receiving chamber defined by said walls of the housing and the side walls of said exposure chamber and open on the back side to provide an access opening; spring means formed on the bottom wall of said cartridge receiving chamber; on the opposite sides of said exposure chamber, a film cartridge adapted to be loaded in said cartridge receiving chamber and including film storage and film take-up portions for engaging said spring means and a film guide portion connecting between said storage and take-up portions; said cartridge receiving chamber including first and second compartments for receiving said film storage and take-up portions of the film cartridge, respectively; and two openings formed in said front wall of the housin

Abstract: Dialkyl-trisulfides having a minimum grade of copper-strip corrosivity which are suitable as extreme-pressure additives, are produced at high selectivity by reacting alkyl-mercaptans and sulfur at a quantitative ratio in a range of 0.5 to 1.0 gram atom of sulfur to 1 mol of alkyl-mercaptan in the presence of magnesium oxide as catalyst.

Abstract: A hermetically sealed container with an openable top lid, capable of completely maintaining the hermetically sealed pressure state over a prolonged period, enabling easy release from the pressurized or vacuum state in the container, allowing pressure measurement in the container during storage, and adapted for repetitive use. In this container, the concave surface of lid has corrugated recesses and is provided in the center with a valve for pressure releasing and pressure testing, of which upper end is positioned not exceeding a plane containing the upper rim of the lid.

Abstract: A record player has a turntable, a drive means to turn the turntable, a position detecting means for detecting the rotational position of the turntable and a stopping means for stopping the turntable. The stopping means is operated by a detecting output from the position detecting means so as to stop the turntable at a predetermined position.

Abstract: A transformer includes a magnetic core; an input or primary winding structure wound on a bobbin secured to the magnetic core and including first and second primary winding portions; an output or secondary winding structure wound on the bobbin and including first and second secondary winding portions; and a control or tertiary winding structure wound on the bobbin and including first and second tertiary winding portions with the first tertiary winding portion being comprised of first and second windings connected in series, the primary, secondary and tertiary winding structures being wound on the bobbin in the order of the first primary winding portion, the first winding of the first tertiary winding portion, the first secondary winding portion, the second secondary winding portion, the second winding of the first tertiary winding portion, the second primary winding portion, and the second tertiary winding portion, so as to provide a high degree of magnetic coupling between the first primary and secondary wind

Abstract: A switching regulator includes a DC voltage source having a pair of DC output terminals, a switching transformer having a magnetic core, first and second primary windings and a secondary winding, a first switching transistor connected in series between the pair of DC output terminals through the first primary winding, a second switching transistor connected in series between the pair of DC output terminals through the first and second primary windings, and a rectifier circuit connected across the secondary winding. A pulse width modulator is provided to produce a PWM (pulse width modulated) control signal the duty of which is proportional to the voltage of the rectifier circuit, and the PWM control signal is selectively supplied to one of the first and second switching transistors in response to the low or high circumstance of a load connected to the rectifier circuit.

Abstract: A switching regulator includes a switching transformer and a switching transistor connected in series between a DC voltage source through the primary winding of the switching transformer. A pulse width modulator and a control pulse signal generator are provided so as to produce a pair of ON- and OFF-pulse signals which are supplied to the control electrode of the switching transistor so as to increase the switching speed thereof.

Abstract: A switching regulator includes an inrush current protective resistor and a starter circuit for a pulse width modulator consisting of a starting resistor and a capacitor. At initial starting mode, the inrush current protective resistor is connected to the starter circuit, and after starting both of the inrush current protective resistor and starting resistor are disconnected so as to reduce power dissipation or consumption thereby. At the same time, a DC voltage source for the pulse width modulator is derived from a rectified secondary voltage through the starting capacitor.

Abstract: In a record player, a turntable is rotatably mounted on a base, and a rotor structure, such as an annular magnet, is mounted on the turntable and cooperates with a stator aperture mounted on the base to cause the turntable to rotate. The annular magnet is preferably a rubber magnet formed by molding rubber mixed with a ferrite powder. For the sake of stability, the annular magnet is in close proximity to the circumference of the turntable. The stator aperture preferably includes bobbins on which stator coils are wound, and arcuate tongues, integral with the base, on which the bobbins are arranged and which form magnetic cores for the stator coils.

Abstract: A control circuit is disclosed for use in a switching-type regulator which includes a source of unregulated DC voltage, a switching circuit for interrupting the unregulated DC voltage to produce an AC voltage having a duty cycle which is a function of the operation of the switching circuit, a converter for converting the AC voltage to a regulated DC voltage, a controllable pulse generator for supplying pulses of controllable duration to the switching circuit so as to determine the duty cycle of the AC voltage, a feedback circuit responsive to variations in the regulated DC voltage for controlling the duration of the generated pulses to maintain the regulated DC voltage at a desired level, and disabling circuit for selectively limiting the operation of the pulse generator. The control circuit is used to reset the disabling circuit to an initial state and to change gradually the duration of the pulses which are generated by the pulse generator when the regulator first is turned ON.

Abstract: A current mirror circuit comprised of three transistor devices, each transistor device including an input terminal and first and second output terminals. Two of the devices have their input terminals connected together and one output terminal of each device is connected to a respective current output terminal. The other output terminal of each device is adapted to be supplied with an operating voltage. Each of the first and second transistor devices is formed of at least a pair of transistors connected in Darlington-type configuration. In one embodiment, these Darlington-connected transistors are of complementary types. The third transistor device has its input terminal coupled to one of the current output terminals and one of its output terminals coupled to the common-connected input terminals of the first and second transistor devices. The remaining output terminal of the third transistor device is coupled to a reference potential.