摘要:
A current detecting circuit detects amplitude of a current flowing toward the connecting point of a first transistor and a serial circuit through a second transistor and a comparing circuit compares amplitude of the current detected by the current detecting circuit with the reference value. An oscillation control circuit controls a control current supplied to an oscillating circuit in order to raise the oscillation frequency of the oscillating circuit when amplitude of the current detected by the current detecting circuit is smaller than the reference value as a result of comparison by the comparing circuit in view of preventing the oscillation frequency to be further lowered. Therefore, it is no longer required to design the apparatus by giving allowance to take into consideration the temperature characteristics and fluctuation of parts unlike the related art in which the minimum oscillation frequency of the oscillating circuit is set. Accordingly, variable range of the oscillation frequency can be expanded. As a result, it can be prevented that variable range of the oscillation frequency of the oscillating circuit becomes narrower.
摘要:
In an electronic control unit having a metallic control block in which a plurality of control equipments are installed, a metallic cover member fitted onto the metallic control block, and an electronic control mechanism retained between the control block and the cover member to drive the control equipments, the electronic control mechanism includes: a bus bar constituent made of a resin material and having a power electronic circuit to drive the control equipments; and a print board to control the drive of the control equipments via the bus bar constituent, the print board on which a plurality of electronic parts are mounted being fixed onto the bus bar constituent by means of a metallic fixture section and an electrically conducting section being disposed to electrically conduct the control block to the cover member to provide the same electric potential for both of the cover member and the control block.
摘要:
A power supply unit designed to control a power output and protect an overload easily, economically with little loss. A DC output which is generated by smoothing a rectified current of a rectifier circuit connected to an AC power source is subjected to switching by a switching circuit, creating an AC output which is supplied to a current resonance circuit. A peak detection circuit detects the peak voltage of a resonance voltage of this current resonance circuit. On the basis of a comparison output of the voltage comparator comparing the peak voltage to the reference voltage of a reference voltage source, the switching frequency of the switching circuit is controlled by a switching control circuit so that it is controlled to cause the peak voltage to match the reference voltage. In this manner, the output power is maintained on the constant level.
摘要:
A coordinate input apparatus which can reliably specify a coordinate component (a position coordinate) of a selected position without a complicated structure irrespective of use conditions is provided. A coordinate input apparatus includes a capacity detecting portion which detects capacitance, wherein the coordinate input apparatus specifies a coordinate component of a selected position on the basis of a change in capacitance detected by the capacity detecting portion, and the capacity detecting portion includes a first conductive layer, an insulating layer which is formed on the first conductive layer, and a second conductive layer which is formed on the insulating layer in a mesh shape, and has a predetermined potential difference between the second conductive layer and the first conductive layer.
摘要:
A vehicular marker lamp including an LED, which is disposed with the optical axis in the forward direction of the lamp; and an optical member 14, whch is disposed in front of the LED for guiding light from the LED toward the front of the lamp. The optical member is formed with a lens portion, a connecting portion, and a reflective portion whch are integrated as a plate-shaped single element of a transparent resin. Light from the LED and directed to the front along the LED's optical axis is refracted by the lens portion and passes therethrough to the front of the lamp, and light deviating from the LED's optical axis passes through the connecting portion and is reflected by the reflective portion toward the front of the lamp.
摘要:
In a microcomputer having two program execution states including a supervisor state and a user state, there is disposed a flag or a register having such a flag indicating whether or not a RAM area used in the supervisor state can be used in the user state by the CPU. A judge circuit determines whether or not the CPU has made an attempt to invalidly access the RAM in the user state based on the content of the flag or the register and that of the supervisor/user state specify bit in the status register. In a case of an occurrence of an access violation, a violation signal is sent to the CPU and the selection signal of the RAM is disabled (to be set to an ineffective state), thereby increasing the reliability of the system.
摘要:
A single chip microcomputer formed on a semiconductor substrate includes a central processing unit, a ROM storing therein a program for operating the central processing unit, a digital signal processor, and a multi-port RAM. The digital signal processor develops an outline font on the multi-port RAM in accordance with a program stored in a storage unit provided in the digital signal processor. This eliminates the necessity of development of an outline font by the central processing unit and allows high speed execution of such development of an outline font. Further, the central processing unit and the digital signal processor can operate in a parallel relationship.
摘要:
A positive type photoresist developer which comprises an aqueous solution of quaternary ammonium hydroxide represented by the general formula; ##STR1## (wherein all the symbols are as defined in the appended claims) and hydrazine or hydrazine and a nonionic surfactant is disclosed.The developer can form a fine pattern having a high degree of resolution and can provide an excellent profile with few irregularities in pattern dimensions.
摘要:
A loom for automatically exchanging a full cloth beam for an empty one without stopping its weaving operation. The loom has a driving mechanism for driving a cloth beam to rotate and wind thereon woven fabric. After having wound thereon a predetermined amount of woven fabric, the cloth beam is ejected by an ejector mechanism and moved from the driving mechanism to a cloth beam support to be supported thereon. A cloth beam holder holding thereon an empty cloth beam, has a supplying mechanism for supplying the empty cloth beam to the driving mechanism. The ejector mechanism and the supplying mechanism are mechanically connected so as to operate in timed relation to each other. The woven fabric is separated from the full cloth beam by a cutting mechanism and has a loom side cut end portion. The loom side cut end portion of the woven fabric is wound on the empty cloth beam by a winding mechanism. The winding mechanism includes three kinds of air nozzles for blowing the loom side cut end portion of the woven fabric in desired directions. The cutter mechanism includes a fluid-drive rotary cutter blade driven at a high speed so that the cutting of woven fabric in a loose state is enabled.
摘要:
An electronic control unit includes a casing, a circuit board, and a thermally conductive member. The circuit board is housed in and fixed to the casing. A heating element is mounted on the circuit board. The thermally conductive member is arranged between the casing and heating element for thermal conduction therebetween. The casing includes an internal surface including a contact section in intimate contact with the thermally conductive member. The contact section includes a projecting portion projecting toward the thermally conductive member. The projecting portion is located out of an area of the circuit board, wherein the heating element is located in the area. The heating element is mounted on one side of the circuit board. The thermally conductive member is fixed to another side of the circuit board, and located to face the heating element via the circuit board.