Magnetic field shielding sheet for digitizer, manufacturing method thereof, and portable terminal device using same

A digital converter and magnetic sheet technology, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, shielding materials, etc., can solve problems such as large thickness, distortion of geomagnetic sensors, and expensive materials, and achieve the effect of improving sensitivity

Active Publication Date: 2014-09-17
AMOSENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] The above-mentioned prior art relates to an electromagnetic wave absorbing sheet or a magnetic field shielding sheet. When an electronic pen and navigation functions are simultaneously embodied in a portable terminal such as a smart phone, the conventional magnetic field shielding sheet has problems related to the distortion of the geomagnetic sensor, or for large thickness, material, etc. Expensive problems fail to come up with solutions

Method used

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  • Magnetic field shielding sheet for digitizer, manufacturing method thereof, and portable terminal device using same
  • Magnetic field shielding sheet for digitizer, manufacturing method thereof, and portable terminal device using same
  • Magnetic field shielding sheet for digitizer, manufacturing method thereof, and portable terminal device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0195] Geomagnetic Sensor Characteristics Using Nanocrystalline Ribbon Flakes as Magnetic Field Shielding Flakes

[0196] In Example 1, a nanocrystalline grain strip sheet with a thickness of 25um and an inductance value of 16.5μH was used as a magnetic sheet, and after attaching and laminating a protective film and a double-sided tape with a thickness of 10um on both sides, fragmentation and lamination process, and used as a magnetic field shielding sheet in a portable terminal device with a digitizer function, and measured the operating characteristics of a geomagnetic sensor, and the results are shown in Figure 22a and Figure 22b .

[0197] Figure 22a and Figure 22bWhen the sheet of Example 1 having an inductance value of 16.5 μH is used, the graphs respectively show the angular errors of the five geomagnetic sensors as a function of the angular errors and rotation directions of the five geomagnetic sensors, using the same Method determination.

[0198] refer to ...

Embodiment 2 to Embodiment 4

[0200] Geomagnetic Sensor Characteristics Using Nanocrystalline Ribbon Flakes as Magnetic Field Shielding Flakes

[0201] In Example 2 to Example 4, as in Example 1, respectively, nanocrystalline grain tape sheets with a thickness of 25 μH and inductance values ​​of 17.5 μH, 18.5 μH, and 19.5 μH were used to attach and laminate thicknesses on both sides. After forming a 10um protective film and double-sided tape, perform fragmentation and lamination processes, and use it as a magnetic field shielding sheet in a portable terminal device with a digitizer function, measure the operating characteristics of the geomagnetic sensor, and show the results exist Figure 23a to Figure 25b .

[0202] Figure 23a to Figure 25b To show the angles of the geomagnetic sensors that vary with the angle errors and rotation directions of the five geomagnetic sensors when the sheets of Examples 2 to 4 with inductance values ​​of 17.5 μH, 18.5 μH, and 19.5 μH are applied, respectively error graph...

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Abstract

The present invention relates to: a magnetic field shielding sheet for a digitizer which minimizes an influence on a geomagnetic sensor, shields the electromagnetic field generated from various constituent elements of a main body of a portable terminal device when preparing a digitizer function for the portable terminal device, and can simultaneously improve the sensitivity of an electronic pen; a manufacturing method thereof; and the portable terminal device using the same. The magnetic field shielding sheet of the present invention comprises: a thin magnetic sheet having at least one layer which is formed with a nano-crystalline alloy and is divided into a plurality of fine pieces by flake treatment; a protective film attached to one side of the thin magnetic sheet through a first adhesive layer; and double-sided tape attached to the other side of the thin magnetic sheet through a second adhesive layer formed on one side, wherein the thin magnetic sheet is characterized by heat-treating an amorphous ribbon formed with the nano-crystalline alloy at a temperature of 300 DEG C to 700 DEG C.

Description

technical field [0001] The present invention relates to a magnetic field shielding sheet for a digital converter (digitiser), a preparation method thereof, and a portable terminal device using the sheet. The magnetic field shielding sheet for a digital converter can minimize the influence on a geomagnetic sensor, and can be used as a portable terminal device. When the digitizer functions, it can shield the electromagnetic field generated from various parts of the portable terminal device body, and at the same time contribute to the improvement of the sensitivity of the electronic pen. Background technique [0002] In recent years, portable terminal devices such as smartphones equipped with digitizer functions have been launched and gained popularity. The digital converter using the above-mentioned electronic pen can draw a line with a thickness of about 0.7mm, which is more delicate than the capacitive touch panel recognized with a thickness of 3mm to 4mm, so it is easy to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B27/06H04B1/38
CPCB32B27/06G06F1/1684H01F10/08B82Y25/00G06F1/182H05K9/0075Y10S977/838H04B1/38
Inventor 张吉在李东勋李东根
Owner AMOSENSE
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