Cellular phone with an insulating envelope for preventing leakage of electromagnetic radiation

• US 6,501,945 B1
• Filed: 01/10/2000
• Issued: 12/31/2002
• Est. Priority Date: 02/05/1999
• Status: Expired due to Fees

• Current Assignee: Qisda Corporation
• Original Assignee: BenQ Corporation (Qisda Corporation)
• Inventors: Chien, Yu-Kun
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): SMITH, SHEILA B
• Application Number:
  US09/479,672
• Time in Patent Office: 1,086 Days
• Field of Search: 455/300, 455/301, 455/550, 455/90, 455/575, 455/296, 361/799, 361/800, 361/816, 361/818
• US Class Current: 455/296
• CPC Class Codes: H04B 1/3833 Hand-held transceivers
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10

Abstract

The present invention provides a cellular phone comprising: a housing having front and rear casings wherein the rear casing comprises a metallic layer coated on an inner side of the rear casing for insulating electromagnetic radiation, a circuit board installed in the housing having a board surface and an antenna connector installed at an upper end of the board surface, an antenna installed at an upper end of the housing and electrically connected with the antenna connector at the upper end of the board surface for receiving or emitting electromagnetic radiation, and an elastic conductor. When the front and rear casings are connected, the elastic conductor is elastically clamped between the board surface of the circuit board and the metallic layer on the inner side of the rear casing so that the metallic layer on the inner side of the rear casing, the upper end of the board surface and the elastic conductor will form an insulating envelope for preventing electromagnetic radiation emitted from the antenna connector from interfering with circuits of the cellular phone which are positioned inside the housing of the cellular phone and outside the insulating envelope.

Claims

1. A cellular phone comprising:

a housing having front and rear casings, the rear casing comprising a metallic layer coated on an inner side of the rear casing for insulating electromagnetic waves;

a circuit board installed in the housing having a board surface and an antenna connector installed at an upper end of the board surface;

an antenna installed at an upper end of the housing and electrically connected with the antenna connector at the upper end of the board surface for receiving or emitting electromagnetic radiation; and

an elastic conductor electrically connected with the metallic layer;

wherein when the front and rear casings are connected, the elastic conductor is elastically clamped between the board surface of the circuit board and the metallic layer on the inner side of the rear casing so that the metallic layer on the inner side of the rear casing, the upper end of the board surface and the elastic conductor form an insulating envelope for preventing electromagnetic radiation emitted from the antenna connector from interfering with circuits of the cellular phone that are positioned inside the housing of the cellular phone and outside the insulating envelope.

2. The cellular phone of claim 1 wherein the elastic conductor is fixed to the inner side of the rear casing.

3. The cellular phone of claim 2 further comprising a protruded conductor installed on the board surface wherein when the front and rear casings are connected, the elastic conductor fixed on the inner side of the rear casing will electrically and physically connect to the protruded conductor on the board surface so that the metallic layer on the inner side of the rear casing, the elastic conductor, the protruded conductor, and the upper end of the board surface will form the insulating envelope.

4. The cellular phone of claim 3 further comprising a power amplifier installed on the board surface wherein the protruded conductor is a metallic shield positioned on the power amplifier for shielding electromagnetic radiation emitted from the power amplifier.

5. The cellular phone of claim 1 wherein the antenna comprises a lower end installed in the housing and positioned in the insulating envelope wherein the insulating envelope prevents leakage of the electromagnetic waves emitted from the antenna connector and the lower end of the antenna.

6. The cellular phone of claim 1 wherein the circuit board is fixed to an inner side of the front casing wherein when the front and rear casings are connected, the elastic conductor is elastically clamped between the metallic layer on the inner side of the rear casing and the board surface of the circuit board in the front casing.

7. The cellular phone of claim 1 wherein the elastic conductor is a strip shaped conductor for elastically contacting the metallic layer of the rear casing and the board surface to form the insulating envelope.

8. The cellular phone of claim 7 wherein the strip shaped conductor is made by wrapping a flexible metallic cloth around a strip-shaped piece of rubber.

9. The cellular phone of claim 1 wherein the circuit board further comprises an electric ground, and the metallic layer of the rear casing is electrically connected to the electric ground of the circuit board for grounding the insulating envelope.

10. A portable communication device comprising:

a housing having front and rear casings, the rear casing comprising a layer coated on an inner side of the rear casing for insulating electromagnetic radiation;

a circuit board installed in the housing having a power amplifier;

a shield positioned on the power amplifier for shielding electromagnetic radiation emitted from the power amplifier; and

an elastic conductor located on the shield, the elastic conductor being made by wrapping a flexible metallic cloth around a piece of rubber;

wherein when the front and rear casings are connected, the elastic conductor is elastically clamped between the shield and the layer on the inner side of the rear casing so that the layer on the inner side of the rear casing, the shield, the upper end of the board surface and the elastic conductor form an insulating envelope for preventing electromagnetic radiation interfering with circuits of the portable communication device that are positioned inside the housing of the cellular phone and outside the insulating envelope.

11. The portable communication device of claim 10, the circuit board further comprising an electric ground, the electric ground of the circuit board electrically connected to the layer of the rear casing for grounding the insulating envelope.

12. A portable communication device comprising:

a housing having a layer coated on an inner side of the housing for insulating electromagnetic radiation;

a circuit board installed in the housing having a power amplifier;

a shield positioned on the power amplifier for shielding electromagnetic radiation emitted from the power amplifier; and

an elastic conductor located on the shield, the elastic conductor being made by wrapping a flexible metallic cloth around a piece of rubber;

wherein the elastic conductor is elastically clamped between the shield and the layer on the inner side of the housing so that the layer on the inner side of the housing, the shield, the upper end of the board surface and the elastic conductor form an insulating envelope for preventing electromagnetic radiation interfering with circuits of the portable communication device that are positioned inside the housing of the cellular phone and outside the insulating envelope.

13. The portable communication device of claim 12 wherein the circuit board further comprises an electric ground and the layer of the housing is electrically connected to the electric ground of the circuit board for grounding the insulating envelope.