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Drop shock measurement system and acceleration sensor element used in the same

a technology of acceleration sensor and drop shock, which is applied in the direction of speed/acceleration/shock measurement, measurement devices, instruments, etc., can solve the problems of significant magnitude of acceleration applied to an object, motherboard mounted on the equipment, and the ever-present accident of drop down

Inactive Publication Date: 2006-03-09
NISHIHARA KAZUNARI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For mobile electronic equipment including a mobile phone, a notebook size computer, a mobile cassette player, compact disc (CD) player, and mini disc (MD) player, drop-down is an ever-present accident when considering its intended use.
A typical failure comes from distortion of a motherboard mounted on the equipment due to drop-down impact, by which some on-board components have shorts in the wiring, or come off the board.
However, the drop-down impact acceleration during falling greatly varies between falling objects, and the acceleration applied to an object has significant magnitude.
The reasons above have been obstacles to detection of drop-down impact acceleration applied to a falling object.

Method used

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  • Drop shock measurement system and acceleration sensor element used in the same
  • Drop shock measurement system and acceleration sensor element used in the same
  • Drop shock measurement system and acceleration sensor element used in the same

Examples

Experimental program
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first exemplary embodiment

[0025]FIG. 1 shows a circuit diagram of a drop impact measuring system in accordance with a first embodiment of the present invention. Acceleration sensors 101, 102, and 103 are connected to switches 106, 107, and 108, respectively. Sensors 101 through 103 are also connected to ground 109. By closing one of switches 106 through 108, an output signal from one of acceleration sensors 101 through 103 is fed into amplifying circuit 104 to be amplified. Amplifying circuit 104 outputs a signal, which corresponds to acceleration, via terminal 110. Logic circuit 105 evaluates whether or not the signal from amplifying circuit 104 stays within a predetermined threshold, and whether resonance occurs or not, accordingly outputs logically evaluated result. Logic circuit 105 determines which one of switches 106 through 108 should be closed, according to the logical evaluation, thereby controlling switches 106 through 108.

[0026]FIGS. 5A through 5D show the structure of an acceleration sensor elem...

second exemplary embodiment

[0062]FIG. 1 also shows a circuit diagram of the drop impact measuring system of the second embodiment. FIG. 2B shows a circuit diagram of the acceleration sensor of the second embodiment. FIGS. 3 and 4 are flow charts illustrating the routine of detecting drop impact acceleration in the drop impact measuring system of the second embodiment. Each of FIGS. 6A through 6C shows an acceleration sensor element having a structure of cantilever beam of the second embodiment.

[0063]FIG. 6A is a top view, FIG. 6B is a bottom view, and FIG. 6C is a perspective view. Each one end of free vibrating sections 641 through 644 are supportably fixed by supporter 645. Free vibrating sections 641, 642, 643, and 644 have main electrodes 601, 602, 603, and 604 on the upper surfaces thereof, and have main electrodes 620, 621, 622, and 623 on the lower surfaces thereof, respectively. Main electrodes 601, 602, 603, and 604 are electrically connected with draw-out electrodes 605, 606, 607, and 608, respecti...

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PUM

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Abstract

The drop impact measuring system has i) a plurality of bimorph-type acceleration sensor containing a plurality of free vibrating sections each of which has individual draw-out electrodes; ii) a switch section for selecting output from the bimorph-type acceleration sensors; iii) an amplifying circuit for amplifying a signal applied via the switch section from the acceleration sensors; and iv) a logic circuit for logically evaluating the output from the amplifying circuit and controlling the switch section according to the result acquired from the logical evaluation.

Description

[0001] This application is a divisional of U.S. patent application Ser. No. 10 / 769,263, filed Jan. 30, 2004, which is a divisional of U.S. patent application Ser. No. 10 / 398,138, filed Aug. 14, 2003, which is a U.S. National Phase Application of PCT Application No. PCT / JP02 / 08053.TECHNICAL FIELD [0002] The present invention relates to a drop impact measuring system used for a drop impact test on mobile electronic equipment including a mobile phone, and also relates to an acceleration sensor element employed for the drop impact measuring system. BACKGROUND ART [0003] For mobile electronic equipment including a mobile phone, a notebook size computer, a mobile cassette player, compact disc (CD) player, and mini disc (MD) player, drop-down is an ever-present accident when considering its intended use. Accordingly, protecting the equipment from impact caused by the drop-down has now been a growing need. A typical failure comes from distortion of a motherboard mounted on the equipment due...

Claims

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Application Information

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IPC IPC(8): G01P15/097G01N21/00G01P15/08G01P15/09
CPCG01N2291/02827G01P15/097G01P15/0922G01P15/0891
Inventor NISHIHARA, KAZUNARITAJIKA, HIROFUMINOMURA, KOJITOJI, MOTOYUKI
Owner NISHIHARA KAZUNARI