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Dual acceleration sensor system

An acceleration sensor, double acceleration technology, applied in the direction of measurement of acceleration, multi-dimensional acceleration measurement, speed/acceleration/shock measurement, etc., can solve problems such as battery exhaustion

Inactive Publication Date: 2008-07-30
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because even when the operation of the system is stopped, the monitoring of the shock must be continued, therefore, the battery will be drained even if the consumption of current or power is slightly increased

Method used

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  • Dual acceleration sensor system
  • Dual acceleration sensor system

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Experimental program
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Embodiment 2

[0041] FIG. 3 is a block diagram showing a dual acceleration sensor system according to Embodiment 2 of the present invention. The difference from embodiment 1 is that the signal processing circuit 4' of the dual acceleration sensor system of embodiment 2 adopts a digital system. The detection signal input to the signal processing circuit 4' is analog-amplified by the amplification circuit 43, converted into a digital signal by the A / D converter 44, and then subjected to signal processing such as calibration by the digital signal processing section 45. As the mode controller 5 switches and controls the low-range mode and the high-range mode, the operation speed switching section 42 switches the conversion cycle (for example, sampling frequency) of A / D conversion.

[0042] The sampling frequency in the high range mode is increased to several times that in the low range mode, and if necessary, the processing clock of the digital signal processing section 45 is accelerated or the...

Embodiment 3

[0044]Although the present invention is applicable regardless of the number of axes of the acceleration sensor, as Embodiment 3 of the present invention, a block diagram of FIG. 4 shows a dual acceleration sensor system of the present invention particularly applied to a three-axis acceleration sensor. The multiplexers 6 and 7 of the dual acceleration sensor system of FIG. 4 time-division and output detection signals of the respective X-axis, Y-axis and Z-axis of the low-range 3-axis acceleration sensor 1' and the high-range 3-axis acceleration sensor 2'. The A / D converter 44 and the digital signal processing section 45 in the signal processing circuit 4' are synchronized with the detected signals of the X-axis, Y-axis, and Z-axis of the multiplexers 6 and 7, and operate more than one axis. The case is 3 times faster, so the power consumption increases accordingly. The further benefit of reduced power consumption can be obtained in accordance with the present invention.

[004...

Embodiment 4

[0047] Fig. 5 is a block diagram showing a dual acceleration sensor system in Embodiment 4 of the present invention. In FIG. 5, reference numeral 8 denotes an acceleration sensor chip, and reference numeral 9 denotes an IC chip. The low-range 3-axis acceleration sensor 1' and the high-range 3-axis acceleration sensor 2' are processed by MEMS (Micro-Electro-Mechanical Systems) and formed on a common silicon substrate. In addition, the multiplexers 6 and 7 and the means 3 for switching signals (switches) are integrated on the same silicon substrate. A signal processing circuit 4' and an operation mode controller 5 are formed on this IC chip 9. Terminals 81 and 91 and sensor switch terminals 82 and 92 are illustrated. Terminals 81 and 91 are used to connect the signal detected by the sensor between the acceleration sensor chip 8 and the IC chip 9. The sensor switch terminals 82 and 92 are used to provide Sensor switching to accelerometer chip 8 and pulse signal for multiplexer ...

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Abstract

Provides a dual accelerometer system that can be used to detect shocks when strong shocks are applied to mobile devices, record the history of applied shocks, and operate with low power consumption. The dual acceleration sensor system includes low-range and high-range acceleration sensors, signal processing circuitry, and / or an operating mode controller for switching signals between the two sensors and switching the operating mode of the signal processing circuitry. The operating mode controller switches between a low range mode processing signals from the low range acceleration sensor at a low range operating rate and a high range mode processing signals from the high range acceleration sensor at a high range operating rate . Judging whether the data processed in the low-range mode exceeds a first threshold, if not, continue the low-range mode, and if yes, switch to the high-range mode. In the high range mode, when the data is below the second threshold for a predetermined period of time, the mode returns to the low range mode, and if not, the high range mode remains.

Description

technical field [0001] The present invention relates to a dual acceleration sensor system that can be used to detect the shock and record the history of the applied shock when a strong shock is applied to a mobile or portable electronic device or the like. Background technique [0002] Due to their characteristics, mobile or portable electronic devices are susceptible to vibration or shock during use or while being carried. In extreme cases, the device may be accidentally dropped. Devices with built-in disks, like notebook computers or some digital video cameras, are especially vulnerable to shock damage and require protection against vibration or shock. Such protective measures are described in Japanese Patent Laid-Open Nos. 2000-241442, 2003-59222, and 2004-146036. In Japanese Patent Laid-Open Publication No. 2000-241442, a technique for detecting a drop to retract a magnetic head to a safe area before a collision is described. This technology has a three-axis accelerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/00G11B19/04G01P15/18G11B21/12
CPCG01P15/08G01P15/18G01P15/00
Inventor 野田胜杉本正和
Owner HITACHI METALS LTD