Electromagnetic shield for cellular telephone

• US 5,657,386 A
• Filed: 09/06/1995
• Issued: 08/12/1997
• Est. Priority Date: 09/06/1995
• Status: Expired due to Fees

• Current Assignee: White Mountain Products Group, Inc.
• Original Assignee: Jurgen H. Schwanke
• Inventors: Schwanke, Jurgen H.
• Primary Examiner(s): CHIANG, JACK
• Application Number:
  US08/524,036
• Time in Patent Office: 706 Days
• Field of Search: 379/437, 379/451, 379/428, 379/433, 379/447, 455/89, 455/90, 455/117, 16/386, 16/342, 250/505.1, 361/814, 361/816, 361/818, 174/35 R, 174/35 GC, 174/35 TS
• US Class Current: 379/433.13
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H04B 1/3833 Hand-held transceivers

Abstract

Cellular telephone having a shield for protecting the user from electromagnetic radiation. The shield is mounted to the housing of the telephone and can be positioned between the antenna and the head of the person using the telephone to protect the person from radiation emitted by the antenna. In one presently preferred embodiment, the shield is fabricated of a plastic material having carbon fibers embedded therein for absorbing and dispersing electromagnetic radiation.

Claims

1. In a cellular telephone:

a housing containing a radio transmitter adapted to be held to the head of a person using the telephone, an antenna connected to the transmitter and extending from one end of the housing for emitting electromagnetic radiation, a shield fabricated of a plastic material having carbon fibers embedded therein for absorbing and dispersing the electromagnetic radiation, and a hinge mounting the shield to the housing toward the one end for movement about an axis perpendicular to the antenna between a position adjacent to the housing and a position adjacent to the antenna for protecting the person from the radiation emitted by the antenna, the hinge permitting movement of the shield along the axis so that the shield can be positioned directly between the antenna and the head of the person using the telephone.

2. In a cellular telephone:

a housing containing a radio transmitter, an antenna connected to the transmitter and extending from one end of the housing for emitting electromagnetic radiation, an earpiece port on one side of the housing near the antenna, a shield for blocking the electromagnetic radiation, and means mounting the shield to the housing between the earpiece port and the antenna for rotational movement about an axis and translational movement along the axis between a position adjacent to the side of the housing and a position adjacent to the antenna.

3. The cellular telephone of claim 2 wherein the shield is fabricated of a plastic material having carbon fibers embedded therein for absorbing and dispersing the electromagnetic radiation.

4. The cellular telephone of claim 2 wherein the means mounting the shield to the housing comprises an axially extending pivot pin which extends from an edge of the shield, a mount receiving the pivot pin, the mount being affixed to the housing so that the shield can rotate about the axis of the pin between extended and retracted positions relative to the antenna and housing, and an axially extending slot formed in the mount for receiving an edge portion of the shield when the shield is in the extended position and is moved along the axis toward the mount with the slot.

5. The cellular telephone of claim 4 wherein the pin is affixed to the shield and is rotatively and slidably received in the mount.

6. In a cellular telephone:

a housing containing a radio transmitter, an antenna connected to the transmitter and extending from one end of the housing for emitting electromagnetic radiation, a shield for blocking the electromagnetic radiation, a pair of axially aligned pivot pins extending from opposite side edges of the shield, a pair of mounts affixed to the housing adjacent to the side edges of the shield and rotatively receiving the pins so that the shield can swing between extended and retracted positions relative to the antenna and housing, and an axially extending slot formed in one of the mounts for receiving an edge portion of the shield when the shield is in the extended position and is moved along the axis toward the mount with the slot.

7. The cellular telephone of claim 6 wherein the shield is fabricated of a plastic material having carbon fibers embedded therein for absorbing and dispersing the electromagnetic radiation.