Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus

Inactive Publication Date: 2005-05-12
SATO HIDEKI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0025] The geomagnetism of the same amplitude and opposite directions is applied to the magnetic sensors before and after the portable electronic apparatus is rotated by 180°. Therefore, each sum of the outputs of the magnetic sensors before and after the portable electronic apparatus is rotated by 180° is independent from the geomagnetism, and cor

Problems solved by technology

There arises therefore a problem that the direction determined from the signal output from the magnetic sensor unit is not precise.
If the signal of the magnetic sensor unit is corrected only by the influence of the magnetic fi

Method used

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  • Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus
  • Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus
  • Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus

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Experimental program
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Example

[0046] A portable electronic apparatus according to an embodiment of the invention will be described with reference to the accompanying drawings, by using a portable phone as an example of the portable electronic apparatus. As shown in the schematic plan view of FIG. 1, the portable phone 10 has a casing 11, an antenna unit 12, a speaker unit 13, a liquid crystal display unit 14, an operation unit (operation signal input unit) 15 and a microphone unit 16. The casing 11 is generally rectangular having sides extending along orthogonal X- and Y-axes as viewed in plan in FIG. 1. The antenna unit 12 is disposed at the upper right or left side of the casing 11. The speaker unit 13 is disposed at the uppermost front side of the casing 11. The liquid crystal display unit 14 is disposed at the front side of the casing 11 under the speaker unit 13. The liquid crystal display unit 14 is used for displaying characters and graphic. The operation unit 15 is disposed at the front side of the casin...

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Abstract

A portable phone has a CPU and a magnetic sensor unit including an X-axis magnetic sensor, a Y-axis magnetic sensor, and a temperature sensor. CPU measures at first and second temperatures the influence of a magnetic field of permanent magnets upon an output Sx of the X-axis magnetic sensor and an output Sy of the Y-axis magnetic sensor, and stores the influence data together with the first and second temperature data. CPU estimates at the present temperature the influence upon the output Sx of the X-axis magnetic sensor and the output Sy of the Y-axis magnetic sensor, from the present temperature detected with the temperature sensor and the stored influence data. CPU corrects the outputs Sx and Sy in accordance with the estimated influence and determines the direction of the portable phone from the corrected outputs Sx and Sy.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a Divisional of U.S. patent application Ser. No. 10 / 190,525 filed on Jul. 9, 2002.[0002] This application is based on Japanese Patent Application No. 2002-115250, filed on Apr. 17, 2002, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0003] A) Field of the Invention [0004] The present invention relates to a portable electronic apparatus having a communication device with permanent magnets and a direction (azimuth) measuring device, to a magnetic sensor unit suitable for the apparatus, and to a direction measuring method for the apparatus. [0005] B) Description of the Related Art [0006] A magnetic sensor unit is known which detects geomagnetism and measures a direction. Recent studies are directed to adding a navigation function to a portable electronic apparatus typically a portable phone having the communication device and the magnetic sensor unit capable of detecting g...

Claims

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Application Information

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IPC IPC(8): H04B1/40G01B7/00G01B7/30G01C17/28G01C17/38H04M1/21H04M1/72403
CPCG01C17/28G01C17/38H04M2250/12H04M1/72522H04M1/21H04M1/72403H04B1/40
Inventor SATO, HIDEKI
Owner SATO HIDEKI
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