Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1875968 A
Publication typeGrant
Publication dateSep 6, 1932
Filing dateJun 18, 1930
Priority dateJun 19, 1929
Publication numberUS 1875968 A, US 1875968A, US-A-1875968, US1875968 A, US1875968A
InventorsWeeber Otto
Original AssigneeSiemens Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Static and magnetic shield
US 1875968 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Sept. 6, 193-2. 1 I 0, wEEBER STATIC AND MAGNETIC SHIELD Filed June 18, 1930 INVENTOR OTWER BY ATTORNEY Patented Sept. 6, 1932 UNITED STATES PATENT OFFICE OTTO WEEBER, OF BERLIN-CHABLQTTENBUBG, GERMANY, ASSIGNOR '10 SIEMENS & HALSKE, AKTIENGESELLSCHAI'T, O1 SIEHENSSTAD'I. NEAR BERLIN, GERMANY, A

coaroaa'rron or'enaum STATIC AND MAGNETIC SHIELD Application filed June 18, 1980, Serial ll'o.

This invention relates generally to shielding devices and more particularly to a shield construction utilizing layers of different materials.

The use of co per as working material for the shielding o self-induction coils or other v parts of radio circuits against the influence in the form of a cylinder havin of external electric fields is well known. When dimensioning the thickness of the coper sheets it was found that the sheet had to made of a greater thickness than reallynecessary for shielding purposes due to the demands of mechanical strength. Since copper sheeting is very expensive and since, for instance in radio receiving apparatus with several tubes, considerable quantities of copper sheeting had to be employed for the shieldin of the individual self-induction coils an other'parts a considerable increase in the cost of the receivers would result.

It is, therefore, an object of my invention to greatly cut down the cost of radio receivers and other radio apparatus in general by constructing the shield of preferably two materials one known for its chea ness and strength and the other for its go shielding properties.

Other objects of the invention will be apparent in the followin specification when read together with the rawing, the two fi ures of which illustrate schematically a shie (1 made in accordance with the invention.

According to this invention there is used, say, instead of pure copper sheetin aluminum sheeting which 1s coated wit co per. The copper coatin may for instance applied by means of e ectrolysis, but more suitably by means of rolling on, since this is cheaper. It is possible in this manner to combine the small thickness'of, say for in stance, the copper wall necessary for the shielding with sufiicient mechanical stability. When using copperplated sheets covered on both sides there result further electrical advantages which show up particularly in the case of lower frequencies.

In the drawing, a deeply drawn body 1 a closed end terminates in a flange 2 which is rovided with holes 3, 4 forthe mounting. lhe

401,927, and in Germany June 1a, 1929.

flange 2 may be integral with the body porit is evident that any combination of elements or materials may be used as for instance aluminum electroplated with zinc, sheet iron or steel and copper or in fact any usual plating material.

I claim:

1. Static shield particularly for self-induction coils, and of special advantage in radio receiving arrangements, characterized in that itconsists of copper coated aluminum sheeting.

2. Shield according to claim 1, characterized in that the copper coating is disposed on both sides of the sheet.

3. An electromagnetic shield adapted to limit the field roduced by an element used in radio signal ing and to prevent said element from being affected by other electrical fields originating in the vicinity thereof comprising, a shield c0mp0sed ;pf a layer of nonferrous metal which has a" specific gravity constant substantially less than the specific gravity constant of copper, and a layer of highly conductive metal attached to said first named layer.

4. A shield as recited in claim 3 in. which the metal of said first named layer is of material shape retainin strength and said second named layer is 0 copper.

In testimony whereof I ailix my signature.

OTTO WEEBER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2416780 *Dec 31, 1943Mar 4, 1947Philco CorpElectrostatic meter shield
US2892985 *Jul 20, 1954Jun 30, 1959Zenith Radio CorpHigh frequency transformer assembly
US3020447 *Oct 27, 1958Feb 6, 1962Raytheon CoMagnetron systems
US4282597 *Nov 28, 1977Aug 4, 1981Texas Instruments IncorporatedMetal-coated plastic housing for electronic components and the method of making same
US4567317 *Jul 7, 1983Jan 28, 1986Computer Products, Inc.EMI/RFI Protected enclosure
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
US6874953Jul 11, 2003Apr 5, 2005Jds Uniphase CorporationMethods and apparatus for fiber-optic modules with shielded housings/covers with fingers
Classifications
U.S. Classification174/394, 428/935, 313/313, 428/674, 428/652, 428/637, 336/84.00R, 174/395, 313/312
International ClassificationH05K9/00
Cooperative ClassificationH05K9/0075, Y10S428/935
European ClassificationH05K9/00M2