Abstract: A vacuum cleaner includes an automated air quantity adjusting mechanism which has good linearity and has no hysteresis. The automated air quantity adjusting mechanism includes an exhaust opening section 7a formed within a cylindrical body 7. A flange 26 provides the exhaust opening section 7a at the lower section of a supporting body 6 which supports an electric generator 9. A guide shaft 21 is provided at a central section of the exhaust opening section 7a in a standing manner which guide shaft has a stopper member 24 at its uppermost edge section. The mechanism further includes a circular plate shaped valve 22 in which the guide shaft 21 is passed therethrough, and a returning coil spring 25 for pushing the valve 22 towards the stopper 24.

Abstract: A vacuum cleaner includes an optical dust sensor for detecting a quantity of dust which sensor is provided at a predetermined position of a suction path for sucking air by a suction force of the vacuum cleaner, whereby an output signal is supplied to a display device so that a display corresponding to the quantity of the sucked dust, which signal is output from the optical dust sensor and is varied in a stageless manner corresponding to the quantity of the dust.

Abstract: A handwriting detecting and storing apparatus comprises a lens having a cone shape at front-most position of a lens system which introduces handwriting image to image pick up means such as a charge coupled device or the like, and a pen shaft provided at a center of the lens having a cone shape, and wherein an optical axis of the lens system, an optical axis of the lens having a cone shape and a central axis of the pen shaft are coincident with one another, so that a writing operation is performed using a writing device, handwriting image is picked up and picked up handwriting information is stored therein. The apparatus decreases handwriting image which is hidden by an edge section of the writing device as little as possible, and obtains handwriting information within a region of a recording face accurately and with a low cost, the region corresponding to a position just below the leading edge of the writing device and a neighboring region with respect to the position.

Abstract: A vacuum cleaner with an indicator for indicating when the dust bag for the vacuum cleaner is full. The indicator includes a turbine provided in a suction pipe, so that the turbine causes an amount of electric power to be generated that corresponds to the amount of negative pressure within the suction pipe. As the dust bag begins to fill, the negative pressure in the suction pipe decreases, and the amount of electric power caused by the turbine also decreases. When the amount of electric power caused by the turbine falls below a predetermined value, the indicator display indicates that the bag is full. If the indicator is employed with a dust sensor, the indicator display can be used to show the amount of detected dust until the bag is full and the operation of the sensor is stopped to allow the display to indicate that the bag is full.

Abstract: A handwriting storing and reproducing method which takes small images including a leading edge for writing and stores the small images in a time sequential manner following a movement of a writing device. The method then reads out the stored small images and overlaps a just read out small image to a previously read out small image so as to obatain a partial image when both small images include portions which include partial handwritings coincident to one another. Thereafter, the method overlaps one partial image to another partial image-so as to obtain a larger image when both partial images include portions which include partial handwritings coincident to one another.

Abstract: A vacuum cleaner comprises a dust sensor having a light emitting device and a light receiving device which devices are provided at predetermined positions of a suction nozzle or a suction pipe in a condition that both devices are opposite to one another in a direction which crosses a dust suction direction by a predetermined angle. A spacer member is positioned at a predetermined accurately position the suction nozzle or the suction pipe by an engagement of with respect to a second projection member and a second concave section, and each device is positioned accurately relative to the spacer member by an engagement of a first concave section and a first projection member.

Abstract: A vacuum cleaner includes an optical dust sensor for detecting a quantity of dust which sensor is provided at a predetermined position of a suction path for sucking air by a suction force of the vacuum cleaner, whereby an output signal is supplied to a display device so that a display corresponding to the quantity of the sucked dust, which signal is output from the optical dust sensor and is varied in a stageless manner corresponding to the quantity of the dust.

Abstract: A writing device for storing handwriting picks up a handwriting which is written on a paper using a lead, using a CCD area sensor by a predetermined sampling frequency, then stores the picked up image data by the storing device under the control of a microcomputer, so that data storing which data are effective for reproducing the handwriting using a comparatively simple program, is achieved.

Abstract: A handwriting storing and reproducing method which takes small images including a leading edge for writing and stores the small images in a time sequential manner following a movement of a writing device. The method then reads out the stored small images and overlaps a just read out small image to a previously read out small image so as to obtain a partial image when both small images include portions which include partial handwritings coincident to one another. Thereafter, the method overlaps one partial image to another partial image so as to obtain a larger image when both partial images include portions which include partial handwritings coincident to one another.

Abstract: A transformer includes a stator core, primary coils, secondary coils, and heat radiating plates each of which projects outward from between interior layers of the primary coil and/or secondary coil. An A.C. arc welder includes the transformer therein, with a movable core which can move to and fro between the primary coils and secondary coils and which has different widths in the movable direction. An A.C. arc welder also includes openings for taking in air at a front portion of a case cover and a fan for exhausting air at a rear portion of the case cover.

Abstract: The present invention provides a head set capable of improving a sense of comfort when being put on, realizing an easier attaching and detaching operation, and minimizing a feeling of being tired even when used for a long time.The head set comprises, an auricle insertion type earphone (1) including, an auricle insertion section (4) covered by a cover (3), a casing (5) incorporating an acoustic converter and a cord (6), a supporting member (7) of a rod shape attached on a body (2) of the auricle insertion type earphone, and a microphone (8) arranged in a vicinity of a tip end of the supporting member (7). The microphone (8) is positioned adjacent to a person's mouth or adjacent to an upper portion of the person's cheek.

Abstract: A vacuum cleaner includes a controlling valve in a ventilating path to a runner of an electric generator which rotates respondingly to a suction force, a rotating angle of the controlling valve is varied corresponding to an increase of the suction force so that an increase of the air flow across the runner is suppressed, thus an increase of a voltage generated by the electric generator is suppressed.

Abstract: A vacuum cleaner rotates a propeller fan by its suction force. The propeller fan rotates a rotor of a d.c. electric energy generator so as to generate electrical energy, and a d.c. voltage corresponding to the suction force is obtained by the generation. The vacuum cleaner employs the d.c. voltage as an operating voltage for a dust sensor and the peripheral circuitry thereof. The vacuum cleaner compares the d.c. voltage with a constant voltage output from a constant-voltage circuit by a comparing circuitry. The vacuum cleaner lowers the gain of an amplifying circuitry based upon a signal output from the comparing circuitry in correspondance to an increasing of the d.c. voltage obtained by the d.c. electric energy generator. The amplifying circuitry amplifies output of the dust sensor. The vacuum cleaner automatically determines detection sensitivity to be a proper sensitivity. The detection sensitivity is the sensitivity for detecting dust, based upon an output from the dust sensor.

Abstract: When characters and the like are written with a writing device, handwriting is detected by a handwriting detection circuit based on outputs from optical sensors and stress sensors and is stored in a handwriting memory section. The handwriting memory section stores the handwriting whereby it can be used as input data for a computer and the like without reductions in the convenience in using the writing device.