WO1995012207A1 - Electrical contact device and hearing aid with such a device - Google Patents

Electrical contact device and hearing aid with such a device Download PDF

Info

Publication number
WO1995012207A1
WO1995012207A1 PCT/DK1994/000396 DK9400396W WO9512207A1 WO 1995012207 A1 WO1995012207 A1 WO 1995012207A1 DK 9400396 W DK9400396 W DK 9400396W WO 9512207 A1 WO9512207 A1 WO 9512207A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
contact device
contact member
lamina
hearing aid
Prior art date
Application number
PCT/DK1994/000396
Other languages
French (fr)
Inventor
Jacek Krzeminski
Original Assignee
Oticon A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oticon A/S filed Critical Oticon A/S
Priority to AU80575/94A priority Critical patent/AU8057594A/en
Publication of WO1995012207A1 publication Critical patent/WO1995012207A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/63—Contacts actuated by axial cams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/603—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of mechanical or electronic switches or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/609—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of circuitry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • H01H1/66—Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/11—Movable parts; Contacts mounted thereon with indexing means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/004—Application hearing aid
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/57—Aspects of electrical interconnection between hearing aid parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/61—Aspects relating to mechanical or electronic switches or control elements, e.g. functioning

Definitions

  • the present invention relates to an electrical contact device of the kind set forth in the preamble of claim 1.
  • the movable contact member is consti ⁇ tuted by a thin metal layer directly connected to a flexible plastic sheet, e.g. in the form of a printed circuit.
  • the movable contact member is constituted by a loose bistable metal spring or membrane.
  • the invention also relates to a hearing aid with at least one switch, and, as set forth in claim 7, this hearing aid is characterized in that at least one switch comprises or is constituted by a contact device according to the inven ⁇ tion.
  • Fig. 1 is an exploded view of the contact device seen in perspective.
  • Fig. 2 shows the contact device of Fig. 1 in the assembled state, likewise seen in perspective.
  • Figs. 3 and 4 are diagrammatic sectional views at a larger scale through the contact device according to Figs. 1 and 2 and shows how, by means of an external force, the movable contact member may be moved into contact-making engagement with the stationary contact member,
  • Fig. 5 is a diagrammatic sectional view along the line V-V in Fig. 6 and shows a switch comprising a contact device according to the invention
  • Fig. 6 shows the switch of Fig. 5 seen in the axial direc ⁇ tion of the rotatable actuating member.
  • the electrical contact device shown in Figs. 1 and 2, which as will appear below - is intended to constitute a part of an electrical switch, consists, as taken from below in Fig. 1, of a base plate 5 consisting of a plastic sheet 2, to which a number of stationary contact members 1 are secured by means of cement 4, a spacing plate 6 consisting of a plastic sheet 7 having cement 8 on both sides and in which are pro ⁇ vided a number of through-going openings 14 adjacent to certain parts of the stationary contact members 1 on the base plate 5, two sheet-metal parts 3 formed integrally with a number of springy tabs 3a situated adjacent the through-going openings 14, and - a cover plate 9 consisting of a plastic sheet 10 and cement 11, said plastic sheet 10 differing from the plastic sheets 2 and 7 mentioned above in being fle ⁇ xible, as will appear below.
  • Figs. 3 and 4 as mentioned above constituting diagrammatic partial sectional views through the contact device shown in Fig. 2, show how the flexible plastic sheet 10 yields to an external force P and allows the latter to press the springy tab 3a into contact with the stationary contact member 1. Since the tab 3a consists of elastic material and does not exceed its limit of elasticity when deflected shown in Fig. 4, it will always - even when the force P has been exerted during a long period - return to the position shown in Fig. 3. Since the chamber 14 is completely isolated from the surroundings, the contacting function will not be influenced chemically from the outside, i.e.
  • the contact members 3a and 1 are protected from the oxygen of the air and all those substances, to which especially an "in-the-air" hearing aid may be exposed, such as perspiration, sebum and ingredients in various cosmetic preparations, including skin cream, hair lotion, shaving lotion etc..
  • the electrical switch shown in Figs. 5 and 6, which includes a contact device 1-11 as described above with reference to Figs. 1-4, comprises a housing 21 with a central partition 15, the contact device - or rather its central parts - being situated in the space ⁇ below the central partition 15 and being kept in place by a cover 22, while the space above the central partition accomodates an actuating member 16 that is rotatably supported about a central bearing stud 23 fixedly supported in the central partition 15.
  • a cor ⁇ responding number of balls 12 are slidingly supported, these balls being situated in a manner corresponding to the posi ⁇ tions of the through-going openings 14 shown in Fig. 1, so that the force 13 shown in Fig.
  • the actuating member 16 carries one or a number of leaf springs 17, the elastic force of which in the position shown to the left in Fig. 5 is sufficient to press the springy tab 3a downwardly to the position shown in Fig. 4, in which it is in contact with the stationary contact member 1.
  • Fig. 6 shows how the rotatable actuating member 16 is pro ⁇ vided with a click-stop projection 19 cooperating with a click-stop spring 18 secured to the housing 21 according to known principles.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Push-Button Switches (AREA)

Abstract

In a contact device consisting of a number of laminae cemented together, of which one lamina constitutes a fixed contact member (1) and another lamina (3) comprises a movable contact member (3a), the contacting occurring in a hermetically closed chamber (14) formed within and between the laminae and having a yielding external wall (10), through which an external force (13) can act upon the movable contact member (3a), the new feature is that the movable contact member (3a) consists of an elastic material, preferably metal. What is achieved with this arrangement is partly a high degree of operating reliability, as the springy contact member (3a) does not become 'fatigued' in the same manner as e.g. plastic material, even after having been held in the contact-making position shown through a long period of time, partly that the contact device may be made with such small dimensions that it is suitable for use in a hearing aid - even a so-called 'in-the-ear' hearing aid, subject to a great risk of chemical influence from e.g. sebum, cosmetic solvents including hair lotion and shaving lotion, battery electrolytes, etc.

Description

ELECTRICAL CONTACT DEVICE AND HEARING AID WITH SUCH A DEVICE.
TECHNICAL FIELD
The present invention relates to an electrical contact device of the kind set forth in the preamble of claim 1.
BACKGROUND ART
Contact devices of the kind referred to above are used in the so-called laminated switches. In one previously known switch of this kind, the movable contact member is consti¬ tuted by a thin metal layer directly connected to a flexible plastic sheet, e.g. in the form of a printed circuit. In another previously known switch of this kind, the movable contact member is constituted by a loose bistable metal spring or membrane. In certain applications, e.g. in switches for hearing aids, at least one movable contact member is to be constantly actuated into contact with the associated stationary contact member, and for this reason the first-mentioned solution is useless, since the flexible plastic sheet, with which the movable contact member is permanently connected, will yield and lose its elasticity when having been acted upon during a long period of time, so that it is no longer able to break the contact concerned. The last-mentioned of the two solutions needs so much space that it cannot be used in a hearing aid, especially not one of the "in-the-ear" type.
DISCLOSURE OF THE INVENTION
It is on this background the object of the invention to provide an electrical contact device of the kind referred to initially, that does not suffer from the disadvantages referred to above, and which is especially useful in ap- paratus, especially hearing-aid apparatus, in which the available amount of space is very small, and this object is achieved with an electrical contact device, according to the invention additionally exhibiting the feature set forth in the characterizing clause of claim 1. With this arrange¬ ment, an elastic force will constantly be available for breaking the contact by allowing the movable contact member to return to the contact-breaking position, even when the movable contact member has been acted upon for a long period of time.
The invention also relates to a hearing aid with at least one switch, and, as set forth in claim 7, this hearing aid is characterized in that at least one switch comprises or is constituted by a contact device according to the inven¬ tion.
Advantageous embodiments of the contact device according to the invention, the effects of which will be evident from the following detailed portion of the present description, are set forth in claims 2-6.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed portion of the present description, the invention will be explained in more detail with reference to the exemplary embodiment of a contact device according to the invention shown in the drawing, in which
Fig. 1 is an exploded view of the contact device seen in perspective.
Fig. 2 shows the contact device of Fig. 1 in the assembled state, likewise seen in perspective.
Figs. 3 and 4 are diagrammatic sectional views at a larger scale through the contact device according to Figs. 1 and 2 and shows how, by means of an external force, the movable contact member may be moved into contact-making engagement with the stationary contact member,
Fig. 5 is a diagrammatic sectional view along the line V-V in Fig. 6 and shows a switch comprising a contact device according to the invention, and
Fig. 6 shows the switch of Fig. 5 seen in the axial direc¬ tion of the rotatable actuating member.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The electrical contact device shown in Figs. 1 and 2, which as will appear below - is intended to constitute a part of an electrical switch, consists, as taken from below in Fig. 1, of a base plate 5 consisting of a plastic sheet 2, to which a number of stationary contact members 1 are secured by means of cement 4, a spacing plate 6 consisting of a plastic sheet 7 having cement 8 on both sides and in which are pro¬ vided a number of through-going openings 14 adjacent to certain parts of the stationary contact members 1 on the base plate 5, two sheet-metal parts 3 formed integrally with a number of springy tabs 3a situated adjacent the through-going openings 14, and - a cover plate 9 consisting of a plastic sheet 10 and cement 11, said plastic sheet 10 differing from the plastic sheets 2 and 7 mentioned above in being fle¬ xible, as will appear below.
When the parts shown in Fig. 1 and described above are as¬ sembled in the manner shown in Fig. 2, the parts are held together by the various layers of cement 4, 8 and 11 in such a manner, that the through-going openings 14 form her¬ metically closed chambers. These chambers may be filled with a corrosion-inhibiting gas or gas mixture, e.g. by carrying out the last step of the assembling work in an atmosphere corresponding thereto.
Figs. 3 and 4, as mentioned above constituting diagrammatic partial sectional views through the contact device shown in Fig. 2, show how the flexible plastic sheet 10 yields to an external force P and allows the latter to press the springy tab 3a into contact with the stationary contact member 1. Since the tab 3a consists of elastic material and does not exceed its limit of elasticity when deflected shown in Fig. 4, it will always - even when the force P has been exerted during a long period - return to the position shown in Fig. 3. Since the chamber 14 is completely isolated from the surroundings, the contacting function will not be influenced chemically from the outside, i.e. the contact members 3a and 1 are protected from the oxygen of the air and all those substances, to which especially an "in-the-air" hearing aid may be exposed, such as perspiration, sebum and ingredients in various cosmetic preparations, including skin cream, hair lotion, shaving lotion etc..
The electrical switch shown in Figs. 5 and 6, which includes a contact device 1-11 as described above with reference to Figs. 1-4, comprises a housing 21 with a central partition 15, the contact device - or rather its central parts - being situated in the space■ below the central partition 15 and being kept in place by a cover 22, while the space above the central partition accomodates an actuating member 16 that is rotatably supported about a central bearing stud 23 fixedly supported in the central partition 15. In the through-going openings in the central partition 15 a cor¬ responding number of balls 12 are slidingly supported, these balls being situated in a manner corresponding to the posi¬ tions of the through-going openings 14 shown in Fig. 1, so that the force 13 shown in Fig. 1 may be exerted by means of these balls. The actuating member 16 carries one or a number of leaf springs 17, the elastic force of which in the position shown to the left in Fig. 5 is sufficient to press the springy tab 3a downwardly to the position shown in Fig. 4, in which it is in contact with the stationary contact member 1.
Fig. 6 shows how the rotatable actuating member 16 is pro¬ vided with a click-stop projection 19 cooperating with a click-stop spring 18 secured to the housing 21 according to known principles.
As will be seen by comparing Figs. 1 and 2, parts of the stationary contact members 1 and of the sheet-metal parts 3 protrude outwardly from the "stack" 2 shown in Figure 2, since parts of sheets lying above have been removed, while the corresponding parts of sheets lying below have not been removed, so that they support the protruding contact ele¬ ments, e.g. with a view to connecting the latter with sui¬ table sockets or rows of soldering lugs.
LIST OF PARTS
P Force (13)
1 Stationary contact member 2 Plastic sheet
3 Sheet-metal part 3a Springy tab
4 Cement
5 Base plate 6 Spacing plate
7 Plastic sheet
8 Cement
9 Cover plate
10 Plastic sheet (flexible) 11 Cement
12 Balls
13 Force (P)
14 Through-going opening/chamber
15 Central partition 16 Actuating member
17 Leaf spring
18 Click-stop spring
19 Click-stop projection 21 Housing 22 Cover
23 Bearing stud

Claims

CLAIMS .
1. Electrical contact device comprising a number of substantially plane laminae (2, 1, 6, 3, 9) cemented toge- ther, at least one stationary contact member (1) , and at least one movable contact member (3a) adapted to be moved towards and away from contact with the stationary contact member (1) , said device being of the kind, in which the parts of the contact members (1, 3a) adapted for mutual contact are placed in outwardly hermetically closed chambers (14) , each comprising at least one outwardly facing wall (9) consisting of fluid-tight and yielding material and adapted to transmit force (P) from an external actuating member (12) to the movable contact member (3a) , characterized in that the movable contact member (3a) is constituted by a flexible tab being a part of a lamina (3) of elastic and electrically conducting metal, said lamina constituting one of said interconnected laminae, the arrangement being such that the flexible tab (3a) , when actuated, cannot be deflec- ted beyond its limit of elasticity.
2. Contact device according to claim 1, characterized in that the lamina (3) of elastic and electrically conducting metal consists of stainless steel, titanium or a copper alloy, possibly coated with a layer of metal or metal alloy of the kind resisting corrosion and providing a low and stable contact resistance.
3. Contact device according to claim 1 or 2, charac- terized in that the hermetically closed chamber or chambers
(14) is/are filled with an anticorrosive gas or gas mixture.
4. Contact device according to anyone or any of the claims 1-3, characterized in that the side of the actuating member (12) facing the yielding wall (9) is curved in a convex manner.
5. Contact device according to claim 4, characterized in that the actuating member is constituted by a ball (12) .
6. Contact device according to any one or any of the claims 1-5, characterized in that the actuating member (12) is adapted to be acted upon in the actuating direction by a leaf spring (17) on an operating member (16) movably sup¬ ported in the contact device, the latter comprising click-stop means (18, 19) for holding the operating member (16) in a predetermined position or a number of such.
7. Hearing aid with at least one electrical switch, characterized in that at least one switch comprises or is constituted by a contact device according to any one or any of the claims 1-6.
PCT/DK1994/000396 1993-10-28 1994-10-27 Electrical contact device and hearing aid with such a device WO1995012207A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80575/94A AU8057594A (en) 1993-10-28 1994-10-27 Electrical contact device and hearing aid with such a device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1214/93 1993-10-28
DK121493A DK168720B1 (en) 1993-10-28 1993-10-28 Contact device and hearing aid equipment with at least one such device

Publications (1)

Publication Number Publication Date
WO1995012207A1 true WO1995012207A1 (en) 1995-05-04

Family

ID=8102263

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000396 WO1995012207A1 (en) 1993-10-28 1994-10-27 Electrical contact device and hearing aid with such a device

Country Status (3)

Country Link
AU (1) AU8057594A (en)
DK (1) DK168720B1 (en)
WO (1) WO1995012207A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000021335A3 (en) * 1998-10-07 2000-07-27 Oticon As Hearing aid and switch for a hearing aid
EP1318535A1 (en) * 2003-03-20 2003-06-11 Phonak Ag Foldable sheet switch and method of manufacture
EP1496530A2 (en) * 2003-07-08 2005-01-12 Sonion Roskilde A/S Control panel with activation zone
US6972386B1 (en) 2004-07-20 2005-12-06 Knowles Electronics, Llc Digital pulse generator and manufacturing method thereof
DE102011103598A1 (en) * 2011-05-30 2012-12-06 Heraeus Materials Technology Gmbh & Co. Kg Switching element produced by punch-laminating technique
DE102011122862B3 (en) * 2011-05-30 2018-11-15 Heraeus Deutschland GmbH & Co. KG Laminate for producing a switch, switch and laminate web with laminate elements of such a laminate and method for producing such a laminate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439697B2 (en) * 1973-08-20 1977-08-04 Northern Electric Co, Ltd., Montreal, Quebec (Kanada) PRESSURE SWITCH
DE3239324A1 (en) * 1982-10-23 1984-04-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Push-button switch in the housing of an electrical apparatus
EP0119418A2 (en) * 1983-02-18 1984-09-26 TELEFUNKEN electronic GmbH Keyboard switching device
DE4126042C2 (en) * 1991-08-06 1993-06-24 Wilhelm Ruf Kg, 8000 Muenchen, De

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439697B2 (en) * 1973-08-20 1977-08-04 Northern Electric Co, Ltd., Montreal, Quebec (Kanada) PRESSURE SWITCH
DE3239324A1 (en) * 1982-10-23 1984-04-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Push-button switch in the housing of an electrical apparatus
EP0119418A2 (en) * 1983-02-18 1984-09-26 TELEFUNKEN electronic GmbH Keyboard switching device
DE4126042C2 (en) * 1991-08-06 1993-06-24 Wilhelm Ruf Kg, 8000 Muenchen, De

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000021335A3 (en) * 1998-10-07 2000-07-27 Oticon As Hearing aid and switch for a hearing aid
US6724901B1 (en) 1998-10-07 2004-04-20 Oticon A/S Hearing aid and switch for a hearing aid
EP1318535A1 (en) * 2003-03-20 2003-06-11 Phonak Ag Foldable sheet switch and method of manufacture
EP1496530A2 (en) * 2003-07-08 2005-01-12 Sonion Roskilde A/S Control panel with activation zone
EP1496530A3 (en) * 2003-07-08 2005-03-23 Sonion Roskilde A/S Control panel with activation zone
US7394911B2 (en) 2003-07-08 2008-07-01 Sonian Roskilde A/S Control panel with activation zone
US6972386B1 (en) 2004-07-20 2005-12-06 Knowles Electronics, Llc Digital pulse generator and manufacturing method thereof
DE102011103598A1 (en) * 2011-05-30 2012-12-06 Heraeus Materials Technology Gmbh & Co. Kg Switching element produced by punch-laminating technique
DE102011103598B4 (en) * 2011-05-30 2017-04-06 Heraeus Deutschland GmbH & Co. KG Laminate for making a switch
DE102011122862B3 (en) * 2011-05-30 2018-11-15 Heraeus Deutschland GmbH & Co. KG Laminate for producing a switch, switch and laminate web with laminate elements of such a laminate and method for producing such a laminate

Also Published As

Publication number Publication date
DK168720B1 (en) 1994-05-24
AU8057594A (en) 1995-05-22
DK121493D0 (en) 1993-10-28

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