Abstract: A ceramic heater which includes: a cylindrical substrate including an insulator; a resistor provided in one end side of the substrate; a pair of lead parts provided in the substrate, connected to the resistor and extending to an opposite end side of the substrate; and a pair of electrode parts exposed to a surface at an opposite end side of the substrate and connected respectively to the lead parts. Both lead parts are made of the same material as both electrode parts. An axial cross-sectional area of the electrode part is equal to or larger than a cross-sectional area of the lead part in a direction perpendicular to an axis of the ceramic heater.

Abstract: In the present invention, an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2: wherein R5 is C1-C10 hydrocarbylene or single bond, R6, R7 and R8 are each independently C1-C10 hydrocarbyl or hydrogen, Y is O, S, Se or Te, p is an integer from 1 to 5 and q is an integer from 0 to 5, is polymerized in the presence of a halide of a 13-16 group element of the long periodic table and/or a polymerization regulator represented by the following Formula 1: wherein R1, R2 and R3 are each C1-C10 hydrocarbyl or hydrogen, R4 is C1-C10 hydrocarbylene or single bond, X is F, Cl, Br, I, As, SH, OH, C1-C10 alkoxyl, C1-C10 alkylthio, or C1-C10 mercaptoalkylthio, and m is an integer from 1 to 5, to produce a cured resin suitable as an optical material. By using the polymerization regulator, the polymerization rate of the episulfide compound can be suitably regulated to obtain a cured resin with less defect.

Abstract: This invention relates to a printing apparatus, printhead, and cartridge type discrimination method capable of achieving high-reliability, high-quality printing by effectively utilizing a memory element incorporated in the printing apparatus and dealing with an error by all the building components of the printing apparatus. According to this invention, in a printing apparatus which prints on a printing medium with an ink cartridge and inkjet printhead mounted on a carriage, mounting of the ink cartridge on the carriage is detected, identification information is read from the non-volatile memory of the ink cartridge, and it is discriminated on the basis of the identification information whether or not the mounted cartridge is a certified one for the printing apparatus.

Abstract: In a liquid discharge detection method and apparatus which detect a liquid discharged from a liquid discharge head, an electrode is placed at a position where the liquid discharged from the liquid discharge head comes into contact with the electrode while being in contact with the head. When a liquid is discharged, and the head is connected to the electrode through the liquid, the circuit becomes a closed circuit. A voltage generated between the two ends of a resistor r is obtained from a current i flowing in the closed circuit. When this voltage becomes equal to or higher than a predetermined voltage, liquid discharge can be detected.

Abstract: A telemetering system allows a receiver to provide an indication related linearly with the data from a sensor in a transmitter that comprises an amplifier composed of relatively inexpensive and low-quality parts. The transmitter includes an ID ROM (10) that stores an ID code specifying itself, and it transmits the ID code when transmitting the output from a sensor (1). The receiver includes a correction circuit (13), which finds the correction table corresponding to the transmitter in accordance with the received ID code and corrects the received sensor output on the basis of the correction table.

Abstract: In the present invention, an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2: 1

Abstract: A power system the size of which does not become very large although the system uses secondary batteries, and in which the supply of DC power is not stopped at the time of charging the battery after the secondary battery is completely discharged, and an amplification system for audio using the power system. When no signal is inputted to an amplifier (1) for audio for a fixed period of time or longer, a control circuit (4) gives a connection switching signal (b) to a connection switching circuit (7) under a fixed condition, but, Whenever the signal (b) is given to the circuit (7), one of the secondary batteries (6A and 6B) is switched to the power source of the amplifier (1) from a state where the battery is charged by means of a charging circuit (8), and the other battery is switched to a state where the battery is charged by means of the circuit (8) from a state where the battery supplies electric power to the amplifier (1).

Abstract: The present invention relates to a balancing device for vertically movable dental arms such as a dental light arm and a dental tray arm, and more specifically to a balancing device which is capable of accurately positioning the arm at any desired position by sufficiently balancing the weight of a load head with the force of the spring member coaxially inserted in the arm. The balancing device features compact size, low cost and high operability.

Abstract: This disclosure relates to a rotation control device for an air-drive and air-journal type dental handpiece, wherein rotation control is made by applying a braking force to an air journaled turbine for a certain time by the use of compressed air operated air timer and a closing valve. When the braking force is applied to cut off drive air to the turbine, there is produced negative pressure in the bearing mechanism by the inertial rotation of the turbine, whereupon negative pressure causes the turbine to suck dirt thereinto. There is also a danger of the operator being hurt by idle rotation of the cutting tool which is rotated together with the turbine. The device of the invention prevents effectively this kind of sucking up dirt and injury to operators.

Abstract: This disclosure relates to a driving and water pouring control device for dental air-drive handpiece. According to the control device, there is incorporated a water pouring on-and-off valve means into an air feed passageway for driving a turbine so as to close and open the valve means by using part of air inside the passageway and to concurrently provide the valve means with a function of preventing water from dropping when pouring of water is stopped. The disclosure also relates to a device capable of compactly assembling therein device members.

Abstract: A drive control circuit for a dental treatment table with a hydraulic cylinder for elevating and lowering a seat comprising a hydraulic drive circuit equipped with a hydraulic pump, a first hydraulic valve for elevating said cylinder, and a second hydraulic valve for lowering said cylinder, and a hydraulic pump operation circuit equipped with an air switch, a first air valve for controlling said air switch and said hydraulic valve for elevating said cylinder, and a second valve for controlling said hydraulic valve for lowering said cylinder. The drive control circuit may further comprise a second cylinder for tilting a backrest which can be controlled by the hydraulic drive circuit and the hydraulic pump operation circuit.

Abstract: An air operated oil pressure control valve wherein the inlet port and the outlet port for oil are provided in the valve body at a position wherein they face each other with a normally closed valve port located in between. When compressed air is introduced into the valve body, the valve port is opened, allowing the oil pressure to pass through the valve.

Abstract: A foot controller for controlling dental instruments of the type including pedals for controlling the rotational speed of a handpiece. The foot controller is designed such that the front part of the pedal is used for controlling high-speed rotation and requires a small tread pressure; while the rear portion of the pedal is to be used for controlling low-speed rotation and requires a large tread pressure.

Abstract: The disclosure relates to improvements in a hydraulically-actuated control device used in an operation unit of treatment chair and the like in an interlocking relation with reciprocating movement of a hydraulic piston. The device is of the construction in which two control valves slow in closing and opening operation are disposed in the oil supply and discharge passages leading to a hydraulic cylinder having a hydraulic piston therein so as to prevent shock in starting and stopping of the operation unit by controlling opening and closing of the two control valves and operation of the hydraulic pump disposed in the oil supply passage.

Abstract: The disclosure relates to a dental treatment chair which contains in its backrest a dispensing controller for compressed air and water to be distributed to the dental instruments of the chair; the controller includes a distributing block for air and water, air-pressure-operated on-off valves, and couplings to connect flexible connecting pipes connected to the instruments to the supply source side. The chair can reduce the number of compressed air and water pipes leading from the seat body to the backrest of the chair and can diminish the distance of piping between the dental instruments and the dispensing controller to reduce passage resistance.

Abstract: A hanger arm mechanism to hold a lamp head vertically rotatably in dental lighting equipment is directed to a mechanism designed to rotate the lamp head around the axis shaftline of the hanger arm and to stop the same in a desired position, with the result that the field of lighting of the shadowless lamp mounted inside the lamp head can freely be changed in the range of rotation of the lamp head without making the patient turn his head.

Abstract: This disclosure relates to a device for controlling tilting of headrest of treatment table such as for treating the teeth, eyes, nose and the like. The device makes it possible for an operator to tilt the headrest efficiently by such very simple manipulation as to enable backward and rearward tilting of the headrest by pushing in a support shaft in one direction which is transversely incorporated into a headrest carrier or a backrest carrier and to retain the headrest in a desired position by releasing the pushing force of the support shaft in the position.

Abstract: A dental chair which comprises a base; a first raising and lowering mechanism on said base; a member to be selectively raised and lowered by said mechanism; a second raising and lowering mechanism carried by said member; and a seat carried by said second mechanism to be selectively raised and lowered thereby.

Abstract: A dental chair which comprises a seat, a back inclinable relative to said seat, first means for effecting inclination of said back, second means for pushing the front portion of said seat upward, and third means operable in response to overinclination of said back beyond the normal inclination thereof to drive said second means so as to raise the front portion of said seat relative to the rear portion thereof.