Mitsumi Electric Company Ltd.

Yoshihiro Sakanushi

Kenichi Furukawa

Toshio Takeuchi

Masanori Matsunaga

Tadao Kazuno

Kensuke Yamada

Naoki Tatsumi

Takayuki Numakunai

Shinji Hirabayashi

Minenori Nagasaka

Shintaro Tomitsuka

An operation input apparatus configured to receive a force from an operator, including: a boardincluding a placement surface on which coilsare placed, the coils being arranged in a circumferential direction of a circle formed by connecting points apart from a reference point by the same distance; a keythat is provided in a side where the force is input with respect to the board; and a return springelastically supporting the key, wherein the keyincludes an opposed surface opposed to the placement surface and an operation surface configured to receive an application of the force, and causes an inductance of at least one of the coilsto change with an approach of the opposed surface to the placement surface due to the application of the force on the operation surface.

Operation input apparatus and operation input detection apparatus

Provided is a personal verification device capable of easily performing personal verification of a user. In the device, under the condition that a user grasps a case () of a game controller (), a vibration control unit () causes a vibration motor () arranged inside of the case () to vibrate in different patterns. A triaxial acceleration sensor () detects vibration generated by the vibration motor () which vibrates in the different patterns, and a storage unit () stores a plurality of pieces of measurement data obtained by the detection for each of the users. A determination unit () performs the personal verification by comparing and collating the data in the storage unit () with the measurement data obtained by vibrating the vibration motor () under the condition that the user grasps the case ().

Personal verification device

An optical disk writing device includes an optical disk drive recording data into an optical disk and having no harddisk as a data buffer, and a host; computer controlling the optical disk drive and transferring the data to the optical disk drive by using a data storage connected to the host computer as a data buffer for the transferring and the recording.

Optical disk recording device and optical disk drive

In an optical pickup, the sum signal -V.sub.MAIN of the light receiving sections A, B, C and D of a main photo diode is applied to an inversion amplifier Amp9, and the sum signal V.sub.MAIN is applied to a data processor section and a mirror signal arithmetic section. An inversion amplifier Amp10, on the side of sub photo diodes, receives the sum of the sum signal -V.sub.SUB E and a corrected signal C*V.sub.MAIN which is obtained by adjusting the sum signal V.sub.MAIN of the main photo diode with a variable resistor VR1. The output of the inversion amplifier Amp10 becomes a regular sub beam receiving signal V.sub.SUB which is obtained by subtracting a correcting signal whose voltage is equal to the main beam leakage signal from the sub photo diode sum signal V.sub.SUB E. The regular sub beam receiving signal is applied to the mirror signal arithmetic section.

Mirror signal arithmetic circuit in an optical disk drive

An improved laser control circuit in a recordable optical disk drive is disclosed. The laser control circuit includes a feeding circuit which supplies an auxiliary current into a bypass capacitor provided on a control line of a drive current switching circuit for a laser diode, so that the charge current for the bypass capacitor is increased. Therefore, the required time to start the emission of the laser beam for recording is reduced. The laser control circuit also includes a control circuit which controls the on/off state of the feeding circuit. The control circuit turns off upon detecting to the transition of the state of the drive current switching circuit to the on state, accordingly it ensure the normal operation of the laser control circuit.

Laser control circuit in recordable optical disk drive

An optical disk writing device includes an optical disk drive recording data into an optical disk and having no harddisk as a data buffer, and a host computer controlling the optical disk drive and transferring the data to the optical disk drive by using a data storage connected to the host computer as a data buffer for the transferring and the recording.

Growing community of inventors

Tokyo, Japan

Yoshihiro Sakanushi