Hitachi, Ltd.

Hitachi Koki Co., Ltd.

Sanwa Electronics Instrument Co., Ltd.

Ihitachi Taga Technology, Ltd.

Shoichi Ito

Kimio Tatsuno

Yoshifumi Homma

Susumu Saito

Motoo Futami

Kunio Miyashita

Takeshi Abe

Toshihiro Takahashi

Kazuo Tahara

Tsunehiro Endo

Toshiyuki Ajima

Hiroshi Suzuki

Haruo Koharagi

Isamu Terashima

Yoshitaro Ishii

Hiroyuki Tadokoro

Fumio Jyoraku

Kozo Tamura

Hisanori Toyoshima

Koji Yamauchi

Hisao Suka

Yasuhiro Yakushiji

Mitsugu Asano

Yasuhiro Kasahara

Mitsuhisa Kawamata

Toshiharu Kodato

Takashi Suzuka

Atusi Hosokawa

Yoshifumi Ono

Tomotaka Honda

Masaki Kaji

Jinichi Hongou

Jinichi Hongo

In a vacuum cleaner, both static pressure H.sub.data and a variation width .DELTA.H in the static pressure appearing when a suction port is operated are detected from a pressure sensor provided at a rear side of a filter within a main body of the vacuum cleaner; a current variation width .DELTA.pbi appearing when the suction port is operated is detected from a current of a nozzel motor for driving a rotary brush stored in a power brush suction port; an air quantity at the suction port is calculated from the current, rotational speed of a fan motor and static pressure; command values are newly obtained by performing a fuzzy calculation with the variation width .DELTA.pbi, static-pressure command value Hcmd; the variation width .DELTA.H and the static-pressure command value Qcmd; the variation width .DELTA.pbi and static-pressure command value Hcmd; and also the variation width .DELTA.H and static-pressure command value Qcmd as the input thereto; the rotational speeds of the fan motor and nozzel motor are controlled from the result of the command values; and further optimum air suction force is automatically obtained, depending upon the suction port under use and cleaning floor plane.

Vacuum cleaner with fuzzy logic control

The present invention relates to a bubble massager used in a bathtub in which a rechargeable storage battery is used as a power supply, One display unit for displaying both a charging state and an operating state is provided. It is possible to discharge and select three types of bubble jets, weak, strong and intermittent, and to display an operating mode. Futhermore, it is possible to display a trouble location of the bubble massager by high-speed flickering of the one display unit. Moreover, the bubble massager constructed so that the jet is controlled so as to be discharged in the order of weak.fwdarw.strong.fwdarw.intermittent and the intermittent jet is made to repeat strong .rarw..fwdarw. feeble jet for providing an uninterrupted jet in order to relieve a shock due to a sensible sudden change caused by change over of the bubble jet.

Bubble massager

A remote control apparatus has a plurality of manipulating buttons fitted in a plurality of windows, respectively, formed in a casing member, each of the manipulating buttons being formed of a transparent material and having a lower portion provided with a switch actuating projection and an upper portion disposed within each of the windows for allowing user to operate the button with his or her finger. A switch array includes a plurality of switches corresponding to the plural manipulating buttons and is mounted within the casing member such that each of the switches can be changed over between ON and OFF states by contact with a switch actuating projection in the operation of the corresponding manipulating button. A mode change-over switch is selectively movable to a plurality of positions for setting one of a plurality of predetermined modes in which the switch array is to be operated, and a display plate for displaying marks indicating functions of the individual manipulating buttons in the mode set by the mode change-over switch is movable with the mode change-over switch and is located between the button array and the switch array so that the marks can be visually recognized through the individual manipulating buttons, and so that the marks displayed correspond to the mode set by the mode change-over switch. The display plate includes slots through which the switch actuating projections extend.

Multi-function keyboard for remote control apparatus

In a laser beam scanner apparatus for scanning the surface of a photosensitive drum or a document to be read by deflecting a laser beam emitted from a laser diode with a deflector, there is provided a drive current control circuit for controlling the magnitude of drive current of said laser diode on the basis of a beam deflection angle of said deflector.

Laser beam scanner apparatus

A laser light source device in which the intensity of laser light emitted from a laser diode is detected, the detected value of the light intensity is compared with a predetermined value to generate a binary signal, the binary signal is used to control the count mode of an up/down counter, and a current for driving the laser diode is controlled on the basis of the output of the up/down counter, to prevent the intensity of laser light from decreasing.

Laser apparatus with control circuit for stabilizing laser output

Disclosed is an exposure amount control device for a copying machine comprising an exposure amount control circuit for controlling an exposure amount by controlling light of the exposure lamp for illuminating an original document to be copied and a digital light control signal generator for supplying a digital light control signal of a variable duty factor to the exposure amount control circuit. The digital light control signal generator includes a light intensity increase/decrease setting circuit and an oscillator for generating an oscillation output of a variable oscillation period in accordance with a light intensity signal from the light intensity increase/decrease setting circuit. The oscillation output of the oscillator is converted to an on-off light signal, which is supplied to the exposure amount control circuit as the digital light control signal. Thus, the digital light control signal generator is perfectly electrically isolated from a primary power supply circuit of the exposure amount control circuit and a highly safe exposure amount control device with a stable control ability due to an on-off light signal is provided.

Exposure amount control device for a copying machine

An apparatus for driving a semiconductor laser for use in a laser-beam printer, in which a laser beam from the laser is deflected so as to scan a light-sensitive drum and a light-sensitive detector placed in the vicinity of one edge of the drum, comprises a first device for determining the operation level for the laser when it scans the drum to record information thereon, a second device for determining the operation level for the laser when it scans the detector to provide a scanning start pulse signal and a controller for controlling the first and second devices so that they are alternately enabled to determine the intensity of the laser beam depending upon whether the drum or the detector is scanned, whereby the intensity of the laser beam is allowed to be adjusted in accordance with the varying light-sensitivity of the drum without fluctuating the instant of generation of the scanning start pulse signal.

Apparatus for driving a semiconductor laser for use in a laser-beam

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Ibaraki, Japan

Shoichi Ito