US3358363A - Method of making fuse elements - Google Patents

Method of making fuse elements Download PDF

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Publication number
US3358363A
US3358363A US38220164A US3358363A US 3358363 A US3358363 A US 3358363A US 38220164 A US38220164 A US 38220164A US 3358363 A US3358363 A US 3358363A
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US
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Grant
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Prior art keywords
fuse
strip
light
elements
material
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Jacks Eric
Feenan John
Leece Charles Frederick
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English Electric Co Ltd
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English Electric Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/02Manufacture of fuses
    • H01H69/022Manufacture of fuses of printed circuit fuses
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02Details
    • H01H85/04Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/046Fuses formed as printed circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49107Fuse making

Description

1967 E. JACKS ETAL- METHOD OF MAKING FUSE ELEMENTS Filed July 13, 1964 United States Patent 3,358,363 METHOD OF MAKING FUSE ELEMENTS Eric Jacks, John Feenan, and Charles Frederick Leece, Liverpool, England, assignors to The English Electric Company Limited, London, England, a British company Filed July 13, 1964, Ser. No. 382,201 Claims priority, application Great Britain, July 19, 1963, 28,654/63 1 Claim. (Cl. 29-623) ABSTRACT OF THE DISCLOSURE This invention relates to a method of making fuse elements by preparing a photographic negative of the shape of the elements and exposing to light through the negative a strip of fusible metal covered with a light-sensitive material. The irradiated material is developed to render its exposed parts etch-resistant and an etch-resistant material is coated on to the unexposed (other) side of the strip to form a supporting layer there-for. Subsequently, the unexposed parts of the metal are etched away and the supporting layer is removed, leaving discrete fine etched fuse elements of the desired shape.

The invention relates to fuse elements.

According to the invention, a method of producing fuse elements includes the steps of applying in etchant-resistant material to the front surface of a strip or sheet of fusible metal an exact replica of the desired shape of the fuse element, the strip having the desired thickness of the fuse element, and applying to the back surface of the strip an etchant-resistant strip-supporting layer capable of being dissolved off by a suitable solvent, then applying etchant material to the front surface of the strip to etch away the strip except where etchant-resistant material has been applied to the front surface and, finally, dissolving off the strip-supporting layer so as to leave only the fuse element.

The carrying-out of the step of dissolving off the stripsupporting layer may be delayed until the fuse element is required for assembly in a fuse-link.

Preferably, the replica of the desired shape of the fuse element is applied to the front surface of the strip by preparing a photographic negative of the desired shape of fuse element, coating the front surface of the strip with light-sensitive material, exposing the coated front surface of the strip to light through the photographic negative so that an area of the light-sensitive material which is an exact replica of the desired shape of the fuse element is acted on by light passing through the photographic negative, developing the exposed coated front surface of the strip so as to harden and render etchantresistant the area of light-sensitive material acted on by the light, and removing the light-sensitive material not acted on by the light.

Advantageously, a plurality of spaced replicas of the desired shapes of fuse-elements are applied to the front surface of the strip in etchant-resistant material.

The invention also extends to include a fuse element made by the method set out in the preceding paragraphs.

One method according to the invention for making fuse elements will now be described by Way of example and with reference to the accompanying drawing which shows a plurality of fuse elements at an intermediate stage during manufacture.

The desired shape of a fuse element is drawn to a large scale on a relatively stable base material. The drawing is photographically reduced to normal size onto a stable base material such as a photographic glass plate or a photographic film, thus producing a negative of the 3,358,363 Patented Dec. 19, 1967 shape of the fuse element. From this negative, a number of photographic positives are prepared by contact printing and these are used to prepare a master negative comprising several negative reproductions of the shape of the fuse element arranged side by side.

Silver strip of suflicient width to produce the number of fuse elements reproduced on the master negative, and having the thickness required of the fuse elements, is prepared by cleaning it and coating one of its surfaces, referred to below as its front surface, with a light-sensitive material. The light-sensitive material is of a type which, when exposed to light and subsequently developed, becomes hard and resistant to an etchant solution, but unless exposed to light can be readily removed by washing.

The coated silver strip is then exposed to light through the master negative so that the light only acts on those areas of the strip aligned with the reproduction of the fuse elements on the master negative. The exposed strip is then developed and washed to remove the light-sensitive material not acted on by the light. The strip thus has imposed on it a positive image of exactly similar shape to the shape of the fuse elements on the master negative.

After drying, the back surface of the strip, that is, the surface not originally coated with light-sensitive material, is treated by applying to it an etchant-resistant layer of material which has sufficient strength to support the strip but which can be readily removed by immersing the strip in a suitable solvent. Examples of such material are solutions of the vinyl copolymer group such as Avigel (trademark).

The strip with the supporting layer is then immersed in the etchant solution which attacks the front surface of the strip and dissolves the silver except where it is covered by the hardened etchant-resistant light-sensitive material. The drawing shows the strip after this operation. The strip has been etched away to leave only portions 1, having the shape of the fuse elements, which are supported by the supporting layer 2. The fuse elements have thin neck-line parts 3 which help in providing the desired fuse characteristics, but which render the elements exceedingly weak structurally. The supporting layer 2, however, protects the elements from damage during the etching process and subsequently during handling.

When the elements are to be assembled into fuse-links, where they will be adequately supported, the supporting layer is dissolved off the strip by immersion in a suitable solvent such as trichloroethylene and the elements are thus separated ready for use.

What we claim as our invention and desire to secure by Letters Patent is:

A method of producing fuse elements from a sheet of silver foil comprising the steps of coating one side of the foil with a light-sensitive material,

positioning over the said side a photographic negative which defines a plurality of spaced replicas of the desired shape of each element,

irradiating with light the coated parts of said side which are uncovered by the negative,

developing the light-sensitive material whereby to harden and render etchant-resistant the light-irradiated parts of the said material, applying to the opposite side of the foil a hardenable etchant-resistant solution of the vinyl copolymer group so as to provide a supporting backing for the foil,

etching away from the said one side of the foil those parts thereof which have not been irradiated with light whereby to define spaced silver strip fusible elements of the desired shape, and

dissolving-away the supporting backing, this step being 2,735,763 2/ 1956 Heath 1568 X delayed .Whereby more .readily to permit'the han-- 3,079,352 2/ 1963 Atkins.

dling of the fuse elements prior to their assembly.

References Cited 5 UNITED STATES PATENTS CHARLIE T. MOON, Examiner.

332,286 12/ 18-85 Pfannkuche 200135 X J. L. CLINE, Assistant. Examiner JOHN F. CAMPBELL, Primary Examiner.

1,426,827 8/1922 Eustice.

US3358363A 1963-07-19 1964-07-13 Method of making fuse elements Expired - Lifetime US3358363A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2865463A GB1086324A (en) 1963-07-19 1963-07-19 Improvements relating to electric fuse elements

Publications (1)

Publication Number Publication Date
US3358363A true US3358363A (en) 1967-12-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US3358363A Expired - Lifetime US3358363A (en) 1963-07-19 1964-07-13 Method of making fuse elements

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US (1) US3358363A (en)
ES (1) ES302195A1 (en)
GB (1) GB1086324A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440722A (en) * 1965-04-15 1969-04-29 Electronic Eng Co California Process for interconnecting integrated circuits
US3535175A (en) * 1968-08-05 1970-10-20 Motorola Inc Process for chemically machining an electromechanical frequency responsive translating device
US3783506A (en) * 1970-10-13 1974-01-08 L Rehfeld Method of producing electrical fuse elements
FR2189855A1 (en) * 1972-06-22 1974-01-25 O L V I S N V
US3877770A (en) * 1971-11-01 1975-04-15 Int Standard Electric Corp Electrical connector assembly
WO1993017442A1 (en) * 1992-02-28 1993-09-02 Avx Corporation Thin film surface mount fuses
US5693454A (en) * 1996-01-24 1997-12-02 United States Surgical Corporation Two-sided photoetching process for needle fabrication
US5762811A (en) * 1996-01-24 1998-06-09 United States Surgical Corporation One-sided photoetching process for needle fabrication
US5792180A (en) * 1996-01-23 1998-08-11 United States Surgical Corporation High bend strength surgical needles and surgical incision members and methods of producing same by double sided photoetching
US5923239A (en) * 1997-12-02 1999-07-13 Littelfuse, Inc. Printed circuit board assembly having an integrated fusible link
US20030048620A1 (en) * 2000-03-14 2003-03-13 Kohshi Nishimura Printed-circuit board with fuse
US6617953B2 (en) 2001-03-26 2003-09-09 Wilson Greatbatch Ltd. Link fuse
US6618273B2 (en) 2001-03-27 2003-09-09 Wilson Greatbatch Ltd. Trace fuse
US20050122204A1 (en) * 2003-12-03 2005-06-09 International Business Machines Corporation Apparatus and method for electronic fuse with improved esd tolerance
US20050121741A1 (en) * 2003-12-03 2005-06-09 Voldman Steven H. Apparatus and method for electronic fuse with improved ESD tolerance
US20060170528A1 (en) * 2005-01-28 2006-08-03 Yasuhiro Fukushige Dual fuse link thin film fuse
US20100066477A1 (en) * 2008-04-21 2010-03-18 Littlefuse, Inc. Fusible substrate
US20100265031A1 (en) * 2007-12-21 2010-10-21 Chun-Chang Yen Surface mount thin film fuse structure and method of manufacturing the same
US20120013431A1 (en) * 2010-07-16 2012-01-19 Hans-Peter Blattler Fuse element
US20130076478A1 (en) * 2011-09-26 2013-03-28 Siemens Aktiengesellschaft Fuse element
US20170154748A1 (en) * 2012-05-16 2017-06-01 Littelfuse, Inc. Low-current fuse stamping method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332286A (en) * 1885-12-15 Gustav pfannkuche
US1426827A (en) * 1918-03-07 1922-08-22 Alfred L Eustice Method of making fuse links
US2735763A (en) * 1956-02-21 Process for manufacturing small parts
US3079352A (en) * 1956-04-23 1963-02-26 Purex Corp Ltd Protective coating compositions for etching formed from chloroprene polymer, carbon black and phenolaldehyde resin, and metal substrate coated therewith

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US332286A (en) * 1885-12-15 Gustav pfannkuche
US2735763A (en) * 1956-02-21 Process for manufacturing small parts
US1426827A (en) * 1918-03-07 1922-08-22 Alfred L Eustice Method of making fuse links
US3079352A (en) * 1956-04-23 1963-02-26 Purex Corp Ltd Protective coating compositions for etching formed from chloroprene polymer, carbon black and phenolaldehyde resin, and metal substrate coated therewith

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440722A (en) * 1965-04-15 1969-04-29 Electronic Eng Co California Process for interconnecting integrated circuits
US3535175A (en) * 1968-08-05 1970-10-20 Motorola Inc Process for chemically machining an electromechanical frequency responsive translating device
US3783506A (en) * 1970-10-13 1974-01-08 L Rehfeld Method of producing electrical fuse elements
US3877770A (en) * 1971-11-01 1975-04-15 Int Standard Electric Corp Electrical connector assembly
FR2189855A1 (en) * 1972-06-22 1974-01-25 O L V I S N V
WO1993017442A1 (en) * 1992-02-28 1993-09-02 Avx Corporation Thin film surface mount fuses
JP2724044B2 (en) 1992-02-28 1998-03-09 エーヴイエックス コーポレーション Thin film surface-mount fuse
JPH07504296A (en) * 1992-02-28 1995-05-11
US5792180A (en) * 1996-01-23 1998-08-11 United States Surgical Corporation High bend strength surgical needles and surgical incision members and methods of producing same by double sided photoetching
US5693454A (en) * 1996-01-24 1997-12-02 United States Surgical Corporation Two-sided photoetching process for needle fabrication
US5762811A (en) * 1996-01-24 1998-06-09 United States Surgical Corporation One-sided photoetching process for needle fabrication
US5923239A (en) * 1997-12-02 1999-07-13 Littelfuse, Inc. Printed circuit board assembly having an integrated fusible link
US6043966A (en) * 1997-12-02 2000-03-28 Littelfuse, Inc. Printed circuit board assembly having an integrated fusible link
US20050140490A1 (en) * 2000-03-14 2005-06-30 Rohm Co., Ltd. Printed-circuit board with fuse
US20030048620A1 (en) * 2000-03-14 2003-03-13 Kohshi Nishimura Printed-circuit board with fuse
US7116208B2 (en) 2000-03-14 2006-10-03 Rohm Co., Ltd. Printed-circuit board with fuse
US6617953B2 (en) 2001-03-26 2003-09-09 Wilson Greatbatch Ltd. Link fuse
US6618273B2 (en) 2001-03-27 2003-09-09 Wilson Greatbatch Ltd. Trace fuse
US20080254609A1 (en) * 2003-12-03 2008-10-16 International Business Machines Corporation Apparatus and method for electronic fuse with improved esd tolerance
US7943437B2 (en) 2003-12-03 2011-05-17 International Business Machines Corporation Apparatus and method for electronic fuse with improved ESD tolerance
US7106164B2 (en) * 2003-12-03 2006-09-12 International Business Machines Corporation Apparatus and method for electronic fuse with improved ESD tolerance
US20050121741A1 (en) * 2003-12-03 2005-06-09 Voldman Steven H. Apparatus and method for electronic fuse with improved ESD tolerance
US7334320B2 (en) 2003-12-03 2008-02-26 International Business Machines Corporation Method of making an electronic fuse with improved ESD tolerance
US20050122204A1 (en) * 2003-12-03 2005-06-09 International Business Machines Corporation Apparatus and method for electronic fuse with improved esd tolerance
US7477130B2 (en) 2005-01-28 2009-01-13 Littelfuse, Inc. Dual fuse link thin film fuse
US20060170528A1 (en) * 2005-01-28 2006-08-03 Yasuhiro Fukushige Dual fuse link thin film fuse
US20100265031A1 (en) * 2007-12-21 2010-10-21 Chun-Chang Yen Surface mount thin film fuse structure and method of manufacturing the same
US20100066477A1 (en) * 2008-04-21 2010-03-18 Littlefuse, Inc. Fusible substrate
US8525633B2 (en) * 2008-04-21 2013-09-03 Littelfuse, Inc. Fusible substrate
US20120013431A1 (en) * 2010-07-16 2012-01-19 Hans-Peter Blattler Fuse element
US20130076478A1 (en) * 2011-09-26 2013-03-28 Siemens Aktiengesellschaft Fuse element
US20170154748A1 (en) * 2012-05-16 2017-06-01 Littelfuse, Inc. Low-current fuse stamping method

Also Published As

Publication number Publication date Type
ES302195A1 (en) 1965-01-16 application
GB1086324A (en) 1967-10-11 application

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