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Publication numberUS3305623 A
Publication typeGrant
Publication dateFeb 21, 1967
Filing dateOct 19, 1964
Priority dateOct 19, 1964
Publication numberUS 3305623 A, US 3305623A, US-A-3305623, US3305623 A, US3305623A
InventorsBakker Willem F, Johnson Arthur J, Kosiarski Joseph P
Original AssigneeMetex Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shielded window construction
US 3305623 A
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Description  (OCR text may contain errors)

1967 w. F. BAKKER ETAL 3,305,623

SHIELDED WINDOW CONSTRUCTION Filed Oct. 19, 1964 l l Ill/III!!! I P wF M WM? i 3 Jo Q J W M y B a 3,305,623 SHIELDED WINDOW CONSTRUCTION Willem F. Bakker, Clark, Arthur J. Johnson, Newark, and Joseph P. Kosiarski, Freehold, N.J., assignors to Metex Corporation, a corporation of Delaware Filed on. 19, 1964, Ser. No. 404,801 6 Claims. (Cl. 17435) This invention relates to shielded observation windows or similar devices for electrical or electronic devices.

At present the prevention of radio frequency leakage through relatively large openings which require an undistorted view of some form of visual read out, is accomplished by means of a coated glass commonly called conductive glass. Such material affords poor shielding effectiveness against radio frequency loss; the glass is heavy and relatively high in cost and diffic-ulty is encountered in making proper contact between the conductive glass and the surrounding enclosure frame work.

It is an object of the present invention to provide a construction which will eliminate the above objections and other objections arising from the use of the conductive glass, and the present invention contemplates the provision of a window which employs a pair of overlying panes of transparent plastic material such as Plexiglas between which is sandwiched a layer of foraminous metallic mesh that extends co-planar with the panes, the edges of the plastic panes and the edges of the metallic mesh being enclosed in a metallic mounting frame or rim.

In numerous types of electronic equipment which is totally enclosed or confined in shielded boxes, it is frequently necessary or at least desirable that some means be provided to observe certain instruments, the functioning of parts of the apparatus or other features having a bearing on the proper operation of the equipment.

It is accordingly, one of the objects of the invention to provide an observation window for apparatus of this character, which can be made in almost any shape and size to suit special equipment, and which will be provided with shielding material to suppress or exclude radio frequency interference.

It is another object of the invention to provide means for attaching the observation window to the equipmentcontaining enclosure and in such a manner that no objectionable radio frequency leaks will occur around the periphery of the observation panel.

With these and other objects to be hereinafter set forth in view, we have devised the arrangement of parts to be described and more particularly pointed out in the claims appended hereto.

In the accompanying drawing, wherein an illustrative embodiment of the invention is disclosed,

FIG. 1 is a perspective view, with some parts fragmentarily shown, of a shielded observation window constructed according to the invention;

FIG. 2 is a transverse sectional view, taken substantially on the line 2-2 of FIG. 1, looking in the direction of the arrows;

FIG. 3 is a face view of a part of the metallic knit mesh and a part of the metallic binding strip applied thereto; and

FIG. 4 shows an alternate form of metallic mesh.

Referring to the drawing, 1 and 2 respectively indicate a pair of sheets or panes composed of a transparent plastic material, such as Plexiglas or another material of similar characteristics. Sandwiched between the sheets or panes 1 and 2 and lying co-planar therewith, is a layer 3 of foraminous conductive material, such as metallic mesh. Such material may be composed of wire in the knitted form shown in FIG. 3 or it might be of the woven Wire type shown in FIG. 4 or of some other known wire mesh.

Such metallic shielding material while in the form of United States Patent 3,305,623 Patented Feb. 21, 1967 I CC an independent layer disposed between the Plexiglas panes glas or other transparent plastic.

The layer 3 of shielding material, has its peripheral edge enclosed in a binding consisting of a channel strip 5 of metal, such as stainless steel foil, and to which the mesh 3 or 4 is spot welded as shown at 6, thereby providing a metallic enclosing rim or frame for the metal mesh. Both the metallic mesh, framed as above described, and the Plexiglas sheets or panes 1 and 2 are confined in a surrounding frame 7 composed of metal or one which is both conductive and compressively resilient so that it acts gasket-like when secured around an opening in a metallic enclosure as shown in FIG. 2.

The inner edge of the frame 7 is properly grooved, as shown at 9 for the reception of the edges of the Plexiglas panes and also grooved as shown at 10 to snugly receive the binding 5 that extends around the edges of the metal mesh 3, 4.

The result of the structure described is a shielded window which is of sturdy construction; one which provides for complete visibility and one which is very effective to prevent radio frequency leakage. The window constructed as described, is attached over an opening in an enclosure by means of the bolts 11 or equivalent fastening means which pass through the frame 7 and through the marginal edge area defining the opening in the enclosure 8. The frame 7, being to a certain degree compressible, serves as a gasket against the face of the enclosure 8 and establishes good contact between the metallic mesh insert and the body of the enclosure.

While we have herein shown the shielding insert and window as being substantially rectangular in shape, it will be understood that it may be made in various other shapes according to the shape of the opening over which it is fitted. Also while we have suggested that the panes 1 and 2 shall be of a plastic material such as Plexiglas, these panes can, if desired, be composed of glass.

The wire mesh may be replaced with a perforated metal element, photo-etched foil and/or a honeycomb construction with results which are improved over those of the prior art. In addition, a plurality of layers of mesh or the like may be used, as for example, a multiple layer sandwich having a layer of Plexiglas, then mesh, then a second Plexiglas layer, then a second mesh, completed by a third layer of Plexiglas.

Having thus described the invention, it is obvious that the same is not to be restricted thereto, but is broad enough to cover all structures coming within the scope of the annexed claims.

What we claim is:

1. A shielded window for electronic apparatus comprising an enclosure having an opening, a window fitted thereover and closing said opening, said window including a resilient and conductive frame, a pair of transparent panes mounted in said frame, a layer of metallic foraminous mesh confined between the panes, with the edges of the mesh disposed in the frame and in contact therewith, and wherein the edges of the metal mesh are enclosed in a metallic binding strip and said strip is fitted within and in contact with the resilient and conductive frame.

2. A shielded window comprising an enclosure having an opening, a window fitted thereover and closing said opening, said wind-ow including a resilient and conductive frame, a pair of transparent panes mounted in said frame, a layer of metallc foraminous mesh confined between the panes, with the edges of the mesh disposed in the frame and in contact therewith, and wherein grooves are provided in the inside edge of the frame receiving the panes and the metal mesh layer located between them.

3. A shielded window as provided for in claim 1, wherein the metal mesh is composed of wire in knitted form having its edge contained in a binding strip of metal and said strip is fitted in the frame.

4. A shielded window as provided in claim 1, and wherein the metal mesh is composed of wire in woven form and has its edge enclosed in and Welded to a metallic binding strip which is enclosed in the frame.

5-. A shielded window'for a metal enclosure for electronic equipment'comprising a substantially flat layer of foraminous metal, a binding strip around the edges thereof and gripping both faces of said layer, at least one sheet of transparent plastic material contacting a face of said layer, a conductive frame surrounding the edge of said layer, sheet and strip, and in contact with said sheet and strip, and means attached to said frame for anchoring said shielded window into an opening in said enclosure.

References Cited by the Examiner UNITED STATES PATENTS 2/ 1947 Naumann 317-2 l/l960 Hahn.

LEWIS H. MYERS, Primary Examiner.

D. L., CLAY, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2416202 *Jan 14, 1942Feb 18, 1947Westinghouse Electric CorpTreatment for resins to eliminate static
US2958754 *Dec 15, 1958Nov 1, 1960Gen ElectricElectronic ovens
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3376531 *Aug 26, 1966Apr 2, 1968Westinghouse Electric CorpElectrical inductive apparatus with wire cloth shielding means
US3431348 *May 6, 1966Mar 4, 1969Tech Wire Prod IncElectromagnetic shield and viewing laminate
US3469015 *Jan 13, 1967Sep 23, 1969Sierracin CorpConductive panel
US3536820 *Aug 1, 1968Oct 27, 1970Ind Electronics Eng IncBezel assembly
US3885150 *Dec 3, 1973May 20, 1975John Ott LabShielded luminaire
US3978614 *Dec 10, 1973Sep 7, 1976Goldhaber Marvin LCasement covering
US4008383 *Dec 24, 1974Feb 15, 1977Matsushita Electric Industrial Co., Ltd.Microwave oven door assembly
US4247737 *Mar 29, 1979Jan 27, 1981Spectrum Control, Inc.Electromagnetically shielded viewing window
US4514585 *Nov 18, 1982Apr 30, 1985Paynton Richard DFilter and method of manufacturing
US4631214 *Dec 23, 1985Dec 23, 1986Fukuvi Chemical Industry Co., Ltd.Transparent electromagnetic wave shielding material
US4643785 *Mar 1, 1985Feb 17, 1987Paynton Richard DCured laminate formed by the impregnation of a bonding agent unto a mesh, pressed with a translucent plastic substrate
US4661856 *Aug 2, 1985Apr 28, 1987Sun-Flex Company, Inc.Cathode ray tube glare filter, radiation and static electricity suppression device
US4755630 *May 29, 1985Jul 5, 1988Mri Support Systems CorporationEnclosure for providing electromagnetic and magnetic shielding
US4791762 *Jun 2, 1987Dec 20, 1988Hwang Min SuNoise and burglar preventive door and window apparatus
US4941207 *Mar 6, 1987Jul 10, 1990Nihon Musen Kabushiki KaishaStructure for wireless communication in an electromagnetically shielded building
US5239125 *Jun 19, 1990Aug 24, 1993The United States Of America As Represented By The Secretary Of The ArmyFor maintaining electrical conductivity
US5372262 *Jun 28, 1991Dec 13, 1994Digital Equipment CorporationFrame assembly for rack-mountable equipment
US5428924 *Jun 7, 1993Jul 4, 1995Pifer; George M.High security window/door apparatus
US5692922 *Oct 11, 1994Dec 2, 1997Hoechst AktiengesellschaftMolding with electrical contact
US5834124 *Dec 27, 1996Nov 10, 1998Pease Industries, Inc.First and second glass sheets mounted in facing, spaced apart relationship
US6188015 *Jun 2, 1998Feb 13, 2001The Curran CompanyElectromagnetic interference attenuation device
US6607308Aug 22, 2001Aug 19, 2003E20 Communications, Inc.Fiber-optic modules with shielded housing/covers having mixed finger types
US6659655Feb 12, 2001Dec 9, 2003E20 Communications, Inc.Fiber-optic modules with housing/shielding
US6828534 *Oct 29, 2003Dec 7, 2004Schott GlasMicrowave unit door with viewing window
US6874953Jul 11, 2003Apr 5, 2005Jds Uniphase CorporationMethods and apparatus for fiber-optic modules with shielded housings/covers with fingers
US20110206945 *Aug 5, 2009Aug 25, 2011Rouven SeidlerSurface piece
USRE37186Dec 31, 1996May 22, 2001Contra Vision LimitedUnidirectional panel
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EP0111183A2 *Nov 15, 1983Jun 20, 1984Pitney Bowes Inc.Shielding arrangement for electronic postage meter and electronic postage meter having such an arrangement
Classifications
U.S. Classification174/381, 52/202, 52/786.11
International ClassificationH05K9/00, E06B5/18, E06B5/10
Cooperative ClassificationE06B5/18, H05K9/0094
European ClassificationE06B5/18, H05K9/00M5