Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-07-17
1997-12-09
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, 73505, H01L 4108
Patent
active
056964200
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vibration gyroscope apparatus for digitally detecting, for example, the swinging motion of a moving body.
BACKGROUND ART
Heretofore, there have been various kinds of gyroscopes for detecting the swinging motion of a moving body. The various kinds of gyroscopes differ in their operation, characteristics and usage. Accordingly, it is known that the different kinds of gyroscopes are not always suitable for the various intended purposes of use.
Consideration will be made as to a gyroscope which detects the motion of the head of a listener and which is used in an audio reproducing apparatus, as disclosed for example, in Japanese Patent Publication No. 42-227, Japanese Patent Publication No. 54-19242 and Japanese Patent Laid-Open Publication No. 01-112900 which have been filed by the same applicant as in the present application.
In the aforementioned audio reproducing apparatus, headphones can reproduce an audio signal having the same feelings of effect as to localization, sound field, etc. as an audio signal that is reproduced from speakers which are placed in predetermined positions.
This apparatus is used in a system which reproduces a multi-channel audio signal recorded as a stereo signal or the like. Particularly, when an audio signal recorded or transmitted through multiple channels is reproduced from headphones, etc., the respective sound images are localized in a predetermined positional relation, for example, in front right, front left, center, etc. That is, the motion of the listener's is detected by a gyroscope, which thereby reads a control signal, or the like, which controls the audio signal supplied to both ears of the listener from virtual sound source positions in reference to the direction of the head of the listener. Then, the audio signals inputted to the respective channels are corrected and changed by this control signal. As a result, a reproducing effect is obtained as if the audio sound were reproduced from the speakers placed in the virtual sound source positions.
Accordingly, since the gyroscope for detecting the motion of the head of the listener used in this case is mounted on the head of the listener, the gyroscope is required to be small size, light weight, low dissipation power, long life, easy to handle and low cost.
The related art type gyroscope, however, has a highspeed rotating body therein and is called "top type gyroscope", employing the characteristic of a top. Accordingly, the related art type gyroscope has a disadvantage of a short life of not more than several thousands of hours. Further, since most of the related art type gyroscope employs electromagnetic type pickups as motor driving pickups and as detection pickups, dissipation power is large. Further, since the related art type gyroscope requires a special AC power source, a special circuit is required when the gyroscope is used.
Further, since the related art type gyroscope is large in weight and volume and high in cost and has a high-speed rotating body, it is necessary to handle the gyroscope very carefully. Accordingly, the related art type gyroscope is not suitable for holding it over the head so as to detect the rotation of the head.
Particularly, in order to detect a rotating motion with respect to a plurality of axes, a plurality of gyroscopes are required. Further, the gyroscopes using inertia force are required to be attached to the same place disadvantageously.
When the aforementioned top type gyroscopes are used, there is no limitation that the gyroscopes must be attached to the same place. The top type gyroscopes are, however, not suitable for the aforementioned purpose of use since it requires small size, light weight, low dissipation power, long life, easiness to handle and low cost.
A vibration type gyroscope may be employed as a gyroscope which makes up for the disadvantages of the top type gyroscope. Such a vibration type gyroscope electromagnetically vibrates a vibrating body, made of various shapes instead of a rotating body and detects the vib
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Inanaga Kiyofumi
Yamada Yuji
Budd Mark O.
Maioli Jay H.
Sony Corporation
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