Electromagnetic isolation chamber

• US 5,594,200 A
• Filed: 06/09/1995
• Issued: 01/14/1997
• Est. Priority Date: 06/09/1995
• Status: Expired due to Term

• Current Assignee: Ramsey Electronics, Inc. (The Brynavon Group, Inc.)
• Original Assignee: Ramsey Electronics, Inc. (The Brynavon Group, Inc.)
• Inventors: Ramsey, John G.
• Primary Examiner(s): Ledynh, Bot L.
• Application Number:
  US08/488,876
• Time in Patent Office: 585 Days
• Field of Search: 174/35 R, 174/35 MS, 174/35 E, 174/35 GC, 174/50, 361/816, 361/818, 220/4.01, 220/4.02
• US Class Current: 174/382
• CPC Class Codes: H05K 9/0007 Casings standardised racks H05K9/0062
• CPC Class Codes: H05K 9/0069 Methods for measuring the shielding efficiency; Apparatus therefor; Isolation container for testing

Abstract

A glove box enclosing a volume shielded from electromagnetic radiation by the glove box wherein the gloves are formed from conductive material such as chain mail and are conductively and shieldingly attached around apertures in the walls of the glove box, permitting an operator to manipulate directly a device under test within the glove box while maintaining the shielding continuity of the box. A shielded window and an interior light can be included to facilitate viewing of a device within the box during manipulation of the device. The glove box provides an inexpensive, fully-shielded environment for the testing, tuning, adjusting, or repair of RF transmitting or receiving devices such as pagers, electronic notebooks, and cellular telephones.

Claims

1. An electromagnetic isolation chamber containing a volume of space electromagnetically isolated from the surrounding environment, comprising:

a) a wall enclosing said volume, said wall having first electromagnetic shielding surrounding said volume and having an aperture therethrough wherein said first shielding is disrupted; and

b) a flexible, conductive second electromagnetic shielding disposed within said chamber and covering said aperture in said wall and being conductively and shieldingly attached to said first electromagnetic shielding of said wall around the periphery of said aperture, said second shielding being deformable and of sufficient size to enclose objects which may be inserted into said chamber through said aperture and to permit tactile feel and manipulation of said objects within said chamber, so that continuity of electromagnetic isolation of said volume is maintained through said insertion.

2. A chamber in accordance with claim 1 wherein said second electromagnetic shielding is formed of metal.

3. A chamber in accordance with claim 1 wherein said second electromagnetic shielding is chain mail.

4. A chamber in accordance with claim 1 wherein said second shielding is in the shape of a glove.

5. A chamber in accordance with claim 1 wherein said wall comprises a plurality of sides defining a box.

6. A chamber in accordance with claim 5 wherein said box is openable and has a top portion and a base portion.

7. A chamber in accordance with claim 6 wherein said top portion is conductively attached to said base portion.

8. A chamber in accordance with claim 7 wherein said top portion is attached by an attachment which comprises a hinge and a latch.

9. A chamber in accordance with claim 6 further comprising a shielding gasket between said top portion and said base portion.

10. A chamber in accordance with claim 1 further comprising a plurality of apertures in said wall, each of said apertures having a flexible, conductive shielding attached to said first electromagnetic shielding around the periphery of said aperture.

11. A chamber in accordance with claim 1 further comprising a shielded window in said wall.

12. A chamber in accordance with claim 11 wherein said shielding is selected from a list including metal mesh, metal screen, perforated metal sheet, and conductive coating.

13. A chamber in accordance with claim 1 further comprising a light within said chamber.