Electronic device and stylus pen charging method using same

Patent metadata

Field	Value
Publication number	US-2021325981-A1
Application number	US-201917263353-A
Country	US
Kind code	A1
Filing date	Jul 19, 2019
Priority date	Jul 27, 2018
Publication date	Oct 21, 2021
Grant date	—

Abstract

According to various embodiments of the present invention, an electronic device comprises: a housing which comprises a first plate, a second plate facing the opposite direction from the first plate and a lateral member surrounding a space between the first plate and second plate; a hole which is formed through the lateral member and is connected to the space; a stylus pen which can be inserted to the space through the hole, wherein the stylus pen comprises a pen housing extending long between a first end part and a second end part and a first coil positioned inside the pen housing, wound about the axis in a first direction extending from the first end part to the second end part and having the coil length of a first length; a second coil which is disposed inside the space of the housing so as to partly face the first coil of the stylus pen when the stylus pen is fully inserted to the housing, wherein the second coil comprises a conductive wire extending over a first area facing the first coil and a second area not facing the first coil, wherein the conductive wire has a first width in the first area and a second width, which is smaller than the first width, in the second area; and a charging circuit which is electrically connected to the second coil. Other various embodiments other than the various embodiments disclosed in the present invention are possible.

First claim

1 . An electronic device comprising:
a housing comprising a first plate, a second plate facing away from the first plate, and a side member surrounding a space between the first plate and the second plate; a hole formed through the side member and connected to the space; a stylus pen which can be inserted into the space through the hole, the stylus pen comprising a pen housing elongated between a first end and a second end, and a first coil positioned inside the pen housing and wound around axis in a first direction extending from the first end to the second end, the first coil having a coil length corresponding to a first length; a second coil disposed in the space of the housing so as to face a part of the first coil of the stylus pen when the stylus pen is fully inserted into the housing, the second coil comprising a conductive wire extending across a first area facing the first coil and a second area not facing the first coil, the conductive wire having a first width in the first area and having a second width smaller than the first width in the second area; and a charging circuit electrically connected to the second coil.

2 . The electronic device of claim 1 , wherein the stylus pen comprises a ferrite core extending along the axis, and the first coil is wound around the ferrite core.

3 . The electronic device of claim 2 , wherein the ferrite core has a second length larger than the first length.

4 . The electronic device of claim 1 , wherein the stylus pen further comprises a battery electrically connected to the first coil.

5 . The electronic device of claim 1 , wherein the first coil comprises a solenoid coil.

6 . The electronic device of claim 1 , wherein the second coil is formed on a plane facing the stylus pen.

7 . The electronic device of claim 1 , further comprising a conductor positioned inside the housing so as to face the first coil with the stylus pen interposed therebetween.

8 . The electronic device of claim 3 , further comprising at least two conductors positioned inside the housing so as to face the first coil with the stylus pen interposed therebetween, the at least two conductors being disposed on an axis in a second direction such that the length of extension of first end thereof corresponds to the length of extension of a first end of the ferrite core.

9 . The electronic device of claim 3 , wherein the second coil has a third length larger than the second length.

10 . The electronic device of claim 7 , further comprising a processor configured so as to produce a magnetic field in the second coil by using a current received from the charging circuit when the stylus pen is fully inserted into the housing.

11 . The electronic device of claim 10 , wherein the first coil is configured to produce a current by using a magnetic field produced by the second coil.

12 . The electronic device of claim 11 , wherein the processor is configured to produce a magnetic field in the conductor by using the produced current when the stylus pen is fully inserted into the housing.

13 . The electronic device of claim 12 , wherein the first coil is configured to produce a current by using a magnetic field produced by the conductor.

14 . The electronic device of claim 13 , wherein the stylus pen further comprises a charging circuit electrically connected to the first coil, and the stylus pen is configured to charge a battery of the stylus pen through the charging circuit by using the current produced in the first coil and the current produced in the conductor.

15 . An electronic device comprising:
a housing comprising a first plate, a second plate facing away from the first plate, and a side member surrounding a space between the first plate and the second plate; a hole formed through the side member and connected to the space; a stylus pen which can be inserted into the space through the hole, the stylus pen comprising a pen housing elongated between a first end and a second end, and a first coil positioned inside the pen housing and wound around axis in a first direction extending from the first end to the second end, the first coil having a coil length corresponding to a first length; a second coil disposed in the space of the housing so as to face a part of the first coil of the stylus pen when the stylus pen is fully inserted into the housing; a conductor positioned inside the housing so as to face the first coil with the stylus pen interposed therebetween when the stylus pen is fully inserted into the housing; and a charging circuit electrically connected to the second coil.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Junghui
• Kim Yongwoon
• Kim Sungjun

Classifications

• H02J2105/44

  Portable electronic devices · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/70

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• H02J7/342

  The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging (with circuits for polarity protection H02J7/68) · CPC title

• G06F3/0383

  Signal control means within the pointing device · CPC title