Abstract: In a toner cartridge for containing toner utilized in a developing unit of an imaging device of the electrophotographic type, a containing part comprises a foldable material such as vinyl. Thus, the container is folded after toner is supplied to the developing unit. Accordingly, the space for the container filled with toner is prevented from becoming dead space. Further, if the material of the container is transparent, it is possible to detect whether or not toner remains inside of the container.

Abstract: Disclosed is an ignition control apparatus for an internal combustion engine arranged to control an ignition timing and a current conduction initiating timing on the basis of a time elapsed from a point in time at which a reference position is reached by a crank shaft, in which a crank reference position detector is caused to generate a crank reference position signal which is reversed in polarity at a crank reference position of each cylinder of the engine as well as at an intermediate position between a preceding and a succeeding timing at the crank shaft reference position, and a leading edge and a trailing edge of the crank reference position signal are detected so as to determine each of the detection of the revolutional speed of the engine, the ignition timing, and the period of current conduction on the basis of a time elapsed from the detected leading edge or the trailing edge.

Abstract: In an engine load detecting apparatus and ignition control apparatus for an internal combustion engine, in accordance with the pulse signals from a reference position detector for detecting a plurality of reference positions of a crankshaft of the engine an interval average rotation speed for each of the intervals between the generation of the pulse signals is calculated and the interval average rotation speeds are utilized in such a manner that a speed pulsation value is obtained from the difference between the maximum and minimum ones thereof and an engine speed is obtained from the average value thereof thereby determining an engine load or ignition timing in accordance with the speed pulsation value and the engine speed.

Abstract: In an electronic ignition control system utilizing a microcomputer, a reference signal indicative of a crank reference position is counted to sense the rotational speed of an internal combustion engine thereby controlling the ignition timing of the engine. In the system, a reference ignition position is computed using the sensed engine rotational speed as a parameter, and this reference ignition position is corrected using a plurality of information indicative of the operating condition of the engine including the information of the engine rotational speed as parameters.

Abstract: In an electrical fuel injector which comprises an air flow meter for detecting an amount of air intake to an internal combustion engine, a revolution counter for measuring the rate of rotations of the internal combustion engine, and an electronic circuit adapted to arithmetically control an opening time of an injection valve for injecting fuel into the internal combustion engine based on output signals from both air flow meter and revolution counter, a digital filter is provided which has a coefficient variable in accordance with drive conditions of the internal combustion engine, so that the output signal from the air flow meter is applied to the electronic circuit through the digital filter.

Abstract: An electronic controlled fuel injection system having electromagnetic fuel injection valves each of which injects fuel twice during 4-cycle operation strokes, wherein a reference cylinder is provided to inject fuel at intervals of 360.degree. in crankshaft angle, and the next operating cylinder is made to inject fuel 180.degree. after the fuel injection timing for the reference cylinder.