ANTENNA EMBEDDED INPUT DEVICE AND ELECTRONIC DEVICE HAVING THE DEVICE

• US 20110169770A1
• Filed: 01/11/2011
• Published: 07/14/2011
• Est. Priority Date: 01/13/2010
• Status: Abandoned Application

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Shimizu, Yuichi, Oshiro, Kazunori, Mishina, Shuichi, Takashina, Hiroyuki
• Application Number:
  US13/004,492
• Publication Number:
  US 20110169770A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 1/1656 Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories mounting of accessories to a computer display G06F1/1607; display hoods G06F1/1603; cooling arrangements for portable computers G06F1/203
• CPC Class Codes: G06F 1/169 the I/O peripheral being an integrated pointing device, e.g. trackball in the palm rest area, mini-joystick integrated between keyboard keys, touch pads or touch stripes G06F1/1643 takes precedence; constructional details of pointing devices G06F3/033
• CPC Class Codes: G06F 1/1698 the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone details of antennas disposed inside a computer H01Q1/2266
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H01Q 1/2266 disposed inside the computer
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

An antenna embedded input device includes an insulating substrate disposed along a sensing surface, measurement electrodes provided in the insulating substrate and detecting a touch of an object on the sensing surface, an antenna provided in the insulating substrate so as to surround the measurement electrodes and transmitting or receiving a balanced signal, a grounding terminal provided in the insulating substrate, and a grounding conductor connecting an electric midpoint of the antenna to the grounding terminal.

Claims

1. An antenna embedded input device, comprising:

a sensing surface;

an insulating substrate disposed along the sensing surface;

measurement electrodes provided in the insulating substrate and detecting a touch of an object on the sensing surface;

an antenna provided in the insulating substrate so as to surround the measurement electrodes and transmitting or receiving a balanced signal, the antenna having an electric midpoint;

a grounding terminal provided in the insulating substrate; and

a grounding conductor connecting the electric midpoint of the antenna to the grounding terminal.

2. The antenna embedded input device according to claim 1, wherein the antenna includes a first antenna pattern,

wherein the first antenna pattern is disposed on a first surface of the insulating substrate positioned at the sensing surface side so as to surround the measurement electrodes.

3. The antenna embedded input device according to claim 2, wherein the grounding terminal is disposed on a second surface of the insulating substrate positioned at an opposite side to the sensing surface, and

wherein the antenna includes a second antenna pattern which is disposed on the second surface of the insulating substrate and has the electric midpoint.

4. The antenna embedded input device according to claim 3, wherein the measurement electrodes include an electrode pattern which is disposed on the first surface of the insulating substrate so as to detect a touch of an object based on variation in the capacitance, and

wherein the second antenna pattern has a length corresponding to a length of the first antenna pattern and is electrically connected in series to the first antenna pattern.

5. The antenna embedded input device according to claim 3, wherein a cross-sectional area of the first antenna pattern is different from a cross-sectional area of the second antenna pattern.

6. The antenna embedded input device according to claim 3, wherein the first antenna pattern includes a first part and a second part which are separated from each other, and

wherein the first part, at least a portion of the second antenna pattern, and the second part are electrically connected in series in this order.

7. The antenna embedded input device according to claim 3, wherein the antenna includes a third antenna pattern,

wherein the third antenna pattern is disposed in parallel to the first surface inside the insulating substrate, and

wherein the first antenna pattern, at least a portion of the second antenna pattern, and the third antenna pattern are electrically connected in series in this order.

8. The antenna embedded input device according to claim 1, wherein the antenna is connected to the grounding terminal via a varistor.

9. The antenna embedded input device according to claim 1, wherein a detection circuit which detects a touch of an object on the sensing surface in cooperation with the measurement electrodes is provided in the insulating substrate, and

wherein a signal ground of the detection circuit is electrically connected to the grounding terminal.

10. The antenna embedded input device according to claim 1, wherein a detection circuit which detects a touch of an object on the sensing surface in cooperation with the measurement electrodes is provided in the insulating substrate, and

wherein a signal ground of the detection circuit is electrically floated with respect to the grounding terminal.

11. The antenna embedded input device according to claim 1 further comprising mesh-shaped shield electrodes which are provided farther away than the measurement electrodes when seen from the sensing surface in the insulating substrate.

12. An electronic device comprising the antenna embedded input device according to claim 1.