Touch panel, and input device and electronic apparatus each equipped with the touch panel

• US 20040183788A1
• Filed: 01/29/2004
• Published: 09/23/2004
• Est. Priority Date: 01/30/2003
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kurashima, Shigemi, Arita, Takashi, Inoue, Hiroto, Akieda, Shinichiro
• Granted Patent: US 7,307,625 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 19/30 the primary active element being centre-fed and substantially straight, e.g. Yagi antenna

Abstract

A touch panel includes: a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer; a first resistance film that is formed on a surface of the first layer, the surface facing the second layer; a second resistance film that is formed on a surface of the second layer, the surface facing the first layer; and a power supply unit that is provided on the first resistance film. In this touch panel, the first resistance film and the second resistance film form an antenna.

Claims

1. A touch panel comprising:

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer;

a first resistance film that is formed on a surface of the first layer;

a second resistance film that is formed on a surface of the second layer; and

a power supply unit that is provided on the first resistance film,

wherein the first resistance film and the second resistance film that are originally used for sensing a touch form an antenna.

2. The touch panel as claimed in claim 1, wherein the surface of the first layer faces the second layer, and the surface of the second layer faces the first layer.

3. The touch panel as claimed in claim 1, wherein the first and second resistance films.

4. The touch panel as claimed in claim 1, wherein the surface of the first layer is on the opposite side to another surface of the first layer that faces the second layer;

and

the surface of the second layer faces the first layer.

5. The touch panel as claimed in claim 1, wherein the second resistance film is grounded via a capacitor.

6. The touch panel as claimed in claim 1, wherein the power supply unit is a stub that is integrally formed with the first resistance film by patterning.

7. The touch panel as claimed in claim 1, wherein at least one of the first resistance film and the second resistance film is a transparent electrode film.

8. The touch panel as claimed in claim 1, wherein at least one of the first resistance film and the second resistance film is patterned so as to resonate at a predetermined frequency.

9. The touch panel as claimed in claim 1, wherein at least one of the first resistance film and the second resistance film is a printed resistance film including a carbon or organic conductive film that is patterned by screen printing.

10. The touch panel as claimed in claim 1, further comprising a third resistance film that is formed on another surface of the first layer, the surface being on the opposite side to the surface on which the first resistance film is formed,

wherein the second resistance film and the third resistance film have an identical potential with low impedance with respect to a radiofrequency.

11. The touch panel as claimed in claim 1, wherein the first resistance film and the second resistance film form a plurality of antennas that resonate at a predetermined frequency.

12. The touch panel as claimed in claim 1, wherein the first resistance film and the second resistance film form a plurality of antennas that resonate at predetermined different frequencies.

13. The touch panel as claimed in claim 11, wherein the plurality of antennas are arranged in a predetermined manner to form one of a phased array antenna and an adaptive array antenna.

14. The touch panel as claimed in claim 11, wherein the portions that form the plurality of antennas in the first resistance film and the second resistance film have a microstrip line structure.

15. The touch panel as claimed in claim 11, wherein the plurality of antennas form strip lines that are arranged at intervals of a resonant wavelength.

16. The touch panel as claimed in claim 11, further comprising a third resistance film that is formed on another surface of the first layer, the surface being on the opposite side to the surface on which the first resistance film is formed,

wherein:

the plurality of antennas form strip lines that are arranged at intervals of a resonant wavelength; and

the third resistance film has apertures formed in the regions corresponding to the antennas.

17. A touch panel comprising:

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer; and

a first resistance film and a second resistance film that are formed on two parallel surfaces of the first layer and the second layer, and are patterned so as to resonate at a predetermined frequency,

the first resistance film and a second resistance film that are originally used to sense a touch form an antenna.

18. A touch panel comprising:

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer; and

a Yagi-Uda antenna that is formed on the first layer.

19. An input device comprising:

a touch panel;

a touch panel controller that controls the touch panel; and

a transmit/receive unit that transmits and receives data through an antenna,

the touch panel including;

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer;

a first resistance film that is formed on a surface of the first layer;

a second resistance film that is formed on a surface of the second layer; and

a power supply unit that is provided on the first resistance film,

the first resistance film and the second resistance film that are originally used to sense a touch form the antenna.

20. An input device comprising:

a touch panel;

a touch panel controller that controls the touch panel; and

a transmit/receive unit that transmits and receives data through an antenna,

the touch panel including;

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer;

a first resistance film that is formed on a surface of the first layer;

a second resistance film that is formed on a surface of the second layer; and

a power supply unit that is provided on the first resistance film,

the first resistance film and the second resistance film forming a plurality of antennas that resonate at predetermined different frequencies, and

the transmit/receive unit performing ultra broadband wireless communication through the plurality of antennas.

21. An electronic apparatus comprising

an input device that includes:

a touch panel;

a touch panel controller that controls the touch panel; and

a transmit/receive unit that transmits and receives data through an antenna,

the touch panel including;

a first layer and a second layer that are arranged to face each other, with a predetermined gap being formed between the first layer and the second layer;

a first resistance film that is formed on a surface of the first layer;

a second resistance film that is formed on a surface of the second layer; and

a power supply unit that is provided on the first resistance film,

the first resistance film and the second resistance film that are originally used to sense a touch form the antenna.