Sony Corporation

M. I. Laboratories Corporation

Mitsuru Takashima

Yoshihisa Mori

Yoshiki Satoh

Masana Ugaji

Sadaaki Sakurai

Hachisiro Kobayashi

Normally a speaker is used by attaching to a sealed or semi-sealed cabinet so that vibration generated at the front and the back of a diaphragm does not mutually interfere. Therefore, a certain depth and a volume are necessary, and in a limited location such as a front panel of a device, there is a case that it cannot be attached to the most suitable position for a listener. As a means to solve that, a method that a speaker sound at a distant position is led to a front panel by a waveguide is practically used. However, still it has limitations in depth and attaching position, and good results cannot be obtained also in efficiency. A speaker is attached so that a sound generated at the front of the speaker attached to a cabinet is led to a plane such as a front panel of a device by a waveguide, and the opening surface of the waveguide is almost perpendicular to the plane. Since a good sound field is generated on the opposite side to the plane, on a horizontal surface to the opening surface of the waveguide, a high efficiency speaker system having no limitation in the attaching position of a speaker can be obtained.

Speaker system

A bioinformation detection device, comprising a three-layer structure having a base, an elastic body, and a cover body, wherein a closed space is formed by a load applied to the structure, a strain detection element is sealed in the closed space, and an air pressure variation caused by bioinformation is converted into an electric signal and taken out, whereby the detail bioinformation can be accurately provided for a long time.

Bioinformation detection device utilizing air pressure variation

A hand-held massager capable of self-excited, impedance-matched vibration for optimal massaging of each particular body part of each particular individual. The massager includes a hollow, open-ended contact piece to which is coupled a vibrator and which is to be held against a desired body part. A pressure sensor is mounted to the contact piece for sensing pressure variations in the cavity in the contact piece while the open end thereof is held against the body part, in order to ascertain the mechanical impedance of that body part. A closed-loop, electropneumatic vibration control system makes it possible for the mechanical impedance to be fed back to the vibrator, causing the latter to make self-induced vibration. Thus the desired body part is optimally massaged at its resonance frequency.

Impedance-matched vibration massager

A closed pneumatic sound sensor is incorporated in a driver's seat and catches a signal representative of a movement of the body of the driver, and a continuation time period within which the level of the signal does not reach a fixed level is detected. Simultaneously, a signal which is generated only when the vehicle is running is caught from the vehicle, and the two signals are compared with each other by an arithmetic operation circuit. Only when both of the signals are present and a particular tendency appears in the continuation time period of the signal representative of a movement of the body, an alarm is generated. A less expensive doze-at-the-wheel alarming apparatus which does not require cumbersome mounting and does not operate when the vehicle is not running is provided.

Doze alarm for driver using enclosed air sound sensor

An apparatus simulating blood circulation in the human body which allows sphygmic diagnosis simulation to be performed by measuring simulated arterial pulses along a simulated artery portion which simulates an artery portion leading to either the left or right hand of the blood circulating system of the human body. The simulated artery portion is included in a simulated blood circulating passage formed by a layout of tubes representative of the human circulatory system. Each tube has a circular section of rubber resin made of both silicon and natural rubbers in which the wall thickness of the tube, Young Modulus, tensile strength, dimension, and compliance are predetermined to simulate the human body. Sphygmic diagnosis simulation can be performed by measuring the simulated arterial pulses at three points along of a radial artery portion corresponding to three positions of shun, khan, and shaku of the sunko as in the practice of Oriental medicine. Three pressure sensors may be used to detect the simulated pulses and blood circulation at the shun, khan, and shaku spots of the sunko. Information on blood viscosity, artery hardness, and inner wall condition is also obtained.

Apparatus for simulating blood circulation

An apparatus for observing and evaluating blood circulation utilizing pressure sensors disposed along an artery. Three pressure sensors may be used to detect pulses at the shun, khan, and shaku spots of the sunko as in the practice of Oriental medicine. In one embodiment observing blood circulation, a first pressure sensor detects a pulse in the artery on a heart side and a second pressure sensor detects an artery pulse between the heart side and a peripheral side. First and second level detecting means detect when the respective first and second pressure signals exceed predetermined levels and provide output signals to a measuring means. A biasing pressure controlling means controls the biasing force exerted by a biasing means upon the blood flow through the artery and is responsive to the output of the second level detecting means. The measuring means measures a first period of time after the first level detecting means detects that the first pressure signal exceeds a predetermined level and a second period of time from when a notch occurs in the first pressure signal until a notch occurs in the second pressure signal. Information on blood viscosity, artery hardness, and inner wall condition is also obtained.

Apparatus for measuring and evaluating blood circulation

A pulse detecting apparatus includes a combination of a pressure sensor; a minimum value detecting circuit for detecting a minimum value of the output of the pressure sensor; a maximum value detecting circuit for detecting a maximum value of the output of said pressure sensor; pressure applying member for biasing the a pressure sensor upon an artery; a static pressure sensor for detecting the biasing pressure to bias the pressure sensor of the pressure applying means upon the artery; and measured pressure detecting circuit for detecting based upon the output of the static pressure sensor the biasing pressures of said pressure applying member corresponding to the minimum and maximum value detected by said minimum and maximum values detecting means, respectively when the biasing pressure of the pressure applying member is decreased from a given value. A biasing pressure for biasing the pressure sensor of the pressure applying member upon the artery at which pulses necessary for the sphygmic diagnosis can be obtained, that is, the measured pressure, can be accurately determined.

Pulse detecting apparatus

A pressure detecting apparatus comprises a pressure sensor having a vibrating element forming a pressure sensing surface, which is secured to a housing at the periphery thereof; and a pressure transmission member including an abutment portion having an abutment surface which is in contact with a position to be detected and a transmission portion projecting from the substantial center of the rear side of the abutment portion. The transmission member has the tip end surface area which is smaller than that of the pressure sensing surface of said pressure sensor. The transmission portion is secured to the substantial center of the pressure sensing surface of the said pressure sensor at the tip end surface thereof. The area of the abutment surface of said abutment portion being larger than that of the tip end surface of said transmission portion whereby said transmission member being adapted to transmit the pressure applied upon the abutment surface of said abutment portion to the pressure sensing surface of said pressure sensor via the tip end surface of said transmission portion.

Pressure detecting apparatus

An optical pickup has a driving unit for driving a driven member which has an objective lens. The driving unit has an open loop arrangement of a pair of magnets, the same poles of which oppose each other.

Optical pickup having a driving unit for moving objective lens

Herein disclosed is a compact, highly reliable and inexpensive moving coil type cartridge comprising a ring-like magnet which is coaxially disposed with respect to a cantilever having a needle at its free end. A back-up first and a ring-like second auxiliary magnetic members are additionally provided at both sides of the ring magnet to attain the effective utilization of magnetic flux from the ring magnet.

Moving coil type cartridge mounted on cantilever within central opening

The present invention is directed to a pickup cartridge used for reproducing an information recorded on a record disc, the pickup cartridge having a magnet, a stylus which engages a spiral groove on the record disc, a pole piece for forming a path for a magnetic flux generated by the magnet and varied in response to the movement of the stylus and a wire coil wound on the pole piece for producing a signal voltage. The pole piece is made of magnetic material with electrical conductivity, such as permalloy, and is provided with an output electrode portion at one end. One end of the coil wire is connected electrically to the pole piece. The signal voltage is induced in the coil in response to variations in the magnetic flux passing through the pole piece and is fed to the output electrode portion at the end of the pole piece.

Pickup cartridge

A stereophonic pick-up cartridge which has a cantilever having a stylus on a free and thereof and an armature at the rear end thereof, a fixed support and a damper having a first plane surface abutting on the support and a second plane surface abutting on the armature. Grooves are formed in the second plane surface of the damper. The provision of the grooves results in improved isolation between the left and right channels during playback and results in an improved stereophonic pick-up cartridge.

Stereophonic pick-up cartridge

A diaphragm for a loudspeaker includes a core member having a flat front surface from which a frustum-shaped side surface extends to a back portion, a cover member secured to the back portion and adapted to be connected to a voice coil bobbin of the loudspeaker, an outer radiation layer mounted on the front surface and having a relatively high resonance sharpness, and an intermediate layer laminated between the front surface and the outer radiation layer and having a resonance sharpness lower than that of the outer radiation layer.

Growing community of inventors

Tokyo, Japan

Mitsuru Takashima