EP0339151A1 - Keyswitch - Google Patents
Keyswitch Download PDFInfo
- Publication number
- EP0339151A1 EP0339151A1 EP88303848A EP88303848A EP0339151A1 EP 0339151 A1 EP0339151 A1 EP 0339151A1 EP 88303848 A EP88303848 A EP 88303848A EP 88303848 A EP88303848 A EP 88303848A EP 0339151 A1 EP0339151 A1 EP 0339151A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reed
- substrate
- path
- keyswitch
- stop
- Prior art date
- 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.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
Definitions
- This invention relates to a keyswitch, and more particularly to a simple keyswitch.
- the manufacturing cost of the keyswitches is about 30-40 % of the total manufacturing cost of a keyboard.
- the economic difficulty encountered in the computer field is that a conventional keyswitch generally has about ten elements of which about six of the elements are fixed or movable contacts. It is necessary to obtain small tolerance for these six elements. As a consequence, it is difficult and expensive to make conventional keyswitches.
- a keyswitch includes an electrically insulative substrate, and an electrically conductive spring reed mounted on the substrate.
- the substrate has an upper surface on which electrically conductive first and second paths are separately formed.
- the reed has an inclined integral long leg secured at its lower end to the first path of the substrate for establishing an electrical connection therebetween, an inclined integral short leg having a lower end positioned separately above the second path of the substrate, and a vertical integral stop extending downward from the reed and having a lower end which is positioned at a predetermined level slightly higher than the lower end of the short leg.
- the short leg contacts the substrate just before the stop contacts the substrate.
- the reed may be despressed until the stop contacts the substrate so that the short leg makes electrical contact with the second path of the substrate, thereby completing an electrically conductive path between the first and second paths.
- the operator may let go of the reed so that the reed automatically returns to its normal position, permitting the short leg to separate from the second path.
- a keyswitch of this invention includes a spring reed 1 having four inclined integral long legs 2 extending from the end portions of two sides thereof, two inclined integral short legs 3 extending from the middle portions of two sides of the reed 1, and two opposed upright stops 4 extending downward from the central portion of the reed 1. Only one stop 4 can be seen from Fig. 1A.
- a flat substrate 5 of electrically insulative material underlies reed 1.
- a generally C-shaped first conductive path 6 and a L-shaped second conductive path 7 are formed separately on the upper surface of the substrate 5 in such a manner that the first path 6 surrounds the second path 7.
- Two conductive terminal pins 8 and 9 are respectively welded to the second path 7 and the first path 6.
- the substrate 5 can be made from an ordinary printed circuit board but should preferably be made of ceramic material for providing a better adhesive result of the conductive materials forming the paths 6 and 7.
- the first and second paths 6 and 7 may be formed on the substrate 5 using several methods: physical-vapor-deposition, chemical-vapor- deposition, thick-film coating, or printing.
- the thick-film coating method is used so that the product of the keyswitch will be durable.
- the long legs 2 of reed 1 are arranged to contact the first path 6 of the substrate 5 and thus function as the fixed contacts of the keyswitch. Of course, the long legs 2 may also be fixed to the first path 6.
- the short legs 3 of reed 1 are normally positioned separately above the second path 7 and thus function as the movable contacts of the keyswitch.
- An insulative pushbutton 10 (see Fig. 1A) is adapted to the reed 1.
- a rectangular tongue 11 extends downward from the center of the bottom surface of the pushbutton 10 to engage with a rectangular hole formed in the center of the reed 1 for positioning the pushbutton 10 on the reed 1.
- the downward stroke of the 1 can be appropriately controlled.
- an impact sound is incurred so as to signal the operator to let go of the pushbutton 10.
- the contact of the stops 4 with the substrate 5 also makes reed 1 unable to move downward. Because of the provision of the stops 4, the resilience fatigue of the short legs 3 can be diminished.
- the keyswitch of this invention has few elements, it is easy to manufacture it.
- another keyswitch of this invention includes a corrugated conductive spring reed 1′ which is in a generally vertical position.
- a substantially vertical substrate 5′ has a thin L-shaped conductive path 6′ and a thick L-shaped conductive path 7′ both positioned in such a manner that the thin path 6′ is separated from the thick path 7′.
- Two terminal pins 8′ and 9′ are respectively welded to the thick and thin paths 7′ and 6′.
- the reed 1′ is attached at its upper end portion to the thin path 6′ of the substrate 5′ and aligned at its lower end portion with the thick path 7′ of the substrate 5′.
- the upper end portion of reed 1′ functions as a fixed contact.
- the lower end portion of reed 1′ includes a first bent portion 3′ functioning as a movable contact, and a second bent portion 4′ functioning as a stop.
- a pushbutton 10′ is supported by a compression spring 11′ and aligned with the lower end portion of reed 1′.
- the pushbutton 10′ is depressed as shown by arrow A to contact the second bent portion 4′ as shown by arrow B, the first bent portion 4′ of the lower end portion of reed 1′ is impelled by it to contact the thick path 7 so as to form a conductive path between the thin and thick paths 6′ and 7′ through reed 1′.
- the first bent portion 3′ and the second bent portion 4′ of reed 1′ serve the same function and operation as the short legs 3 and the stop 4 in the embodiment of the present invention shown in Figs. 1A-D.
Abstract
A keyswitch includes an insulative substrate (5, 5′) and a conductive spring reed (1, 1′). First and second conductive paths (6 and 7, 6′ and 7′) are formed separately on the upper surface of the substrate (5, 5′). The reed (1, 1′) has an inclined long leg fixed on the first path (6, 6′), an inclined short leg positioned separately near the second path (7, 7′), and an upright stop (4, 4′) extending downward from the reed (1, 1′). The long leg, short leg, and stop (4, 4′) are all integral with the reed (1, 1′). The lower end of the stop (4, 4′) is above the lower end of the short leg. When the reed (1, 1′) is depressed, the short leg contacts the second path (7, 7′) to form a conductive path between the first and second paths (6 and 7, 6′ and 7′), and then the stop (4, 4′) contacts the substrate (5, 5′) so that the reed (1, 1′) no loner moves downward.
Description
- This invention relates to a keyswitch, and more particularly to a simple keyswitch.
- Because computers have become more widely used in recent years, the quantity of the keyboards needed is has also greatly increased. Typically, the manufacturing cost of the keyswitches is about 30-40 % of the total manufacturing cost of a keyboard. The economic difficulty encountered in the computer field is that a conventional keyswitch generally has about ten elements of which about six of the elements are fixed or movable contacts. It is necessary to obtain small tolerance for these six elements. As a consequence, it is difficult and expensive to make conventional keyswitches.
- It is therefore the object of this invention to provide an inexpensive keyswitch which is constructed of fewer elements.
- According to this invention, a keyswitch includes an electrically insulative substrate, and an electrically conductive spring reed mounted on the substrate. The substrate has an upper surface on which electrically conductive first and second paths are separately formed. The reed has an inclined integral long leg secured at its lower end to the first path of the substrate for establishing an electrical connection therebetween, an inclined integral short leg having a lower end positioned separately above the second path of the substrate, and a vertical integral stop extending downward from the reed and having a lower end which is positioned at a predetermined level slightly higher than the lower end of the short leg.
- When the reed is depressed, the short leg contacts the substrate just before the stop contacts the substrate. The reed may be despressed until the stop contacts the substrate so that the short leg makes electrical contact with the second path of the substrate, thereby completing an electrically conductive path between the first and second paths. After the reed has been depressed by an operator to contact the second path with the short leg, the operator may let go of the reed so that the reed automatically returns to its normal position, permitting the short leg to separate from the second path.
- Other features and advantages of this invention will become apparent from the following detailed description of the preferred embodiments of this invention with reference to the accompanying drawings in which:
- Fig. 1A is a partially exploded view of a keyswitch having a flat substrate in accordance with a first embodiment of this invention;
- Fig. 1B is a top view showing the substrate of the keyswitch according to the first embodiment of this invention;
- Fig. 1C is a top view showing the spring reed of the keyswitch according to the first embodiment of this invention;
- Fig. 1D is a side view showing the spring reed of the keyswitch according to the first embodiment of this invention;
- Fig. 2A is a side view of a keyswitch having a substantially vertical substrate and a generally vertical spring reed in accordance with a second embodiment of this invention;
- Fig. 2B is a side view showing the substrate of the keyswitch according to the second embodiment of this invention; and
- Fig. 2C is a side view showing the spring reed of the keyswitch according to the second embodiment of this invention.
- Referring to Figs. 1A-D, a keyswitch of this invention includes a
spring reed 1 having four inclined integrallong legs 2 extending from the end portions of two sides thereof, two inclined integralshort legs 3 extending from the middle portions of two sides of thereed 1, and two opposed upright stops 4 extending downward from the central portion of thereed 1. Only one stop 4 can be seen from Fig. 1A. - A
flat substrate 5 of electrically insulative material underliesreed 1. A generally C-shaped firstconductive path 6 and a L-shaped secondconductive path 7 are formed separately on the upper surface of thesubstrate 5 in such a manner that thefirst path 6 surrounds thesecond path 7. Twoconductive terminal pins second path 7 and thefirst path 6. Thesubstrate 5 can be made from an ordinary printed circuit board but should preferably be made of ceramic material for providing a better adhesive result of the conductive materials forming thepaths second paths substrate 5 using several methods: physical-vapor-deposition, chemical-vapor- deposition, thick-film coating, or printing. Preferably, the thick-film coating method is used so that the product of the keyswitch will be durable. - The
long legs 2 ofreed 1 are arranged to contact thefirst path 6 of thesubstrate 5 and thus function as the fixed contacts of the keyswitch. Of course, thelong legs 2 may also be fixed to thefirst path 6. Theshort legs 3 ofreed 1 are normally positioned separately above thesecond path 7 and thus function as the movable contacts of the keyswitch. An insulative pushbutton 10 (see Fig. 1A) is adapted to thereed 1. Arectangular tongue 11 extends downward from the center of the bottom surface of thepushbutton 10 to engage with a rectangular hole formed in the center of thereed 1 for positioning thepushbutton 10 on thereed 1. When thepushbutton 10 is depressed to impelreed 1, theshort legs 3 of thereed 1 contact thesecond path 7 of thesubstrate 5, and then the stops 4 ofreed 1 contact thesubstrate 5 so thatreed 1 no longer moves downward. A conductive path is therefore formed between the first andsecond paths reed 1. - With the stops 4 extending downward from
reed 1, the downward stroke of the 1 can be appropriately controlled. When the stops 4 contact on thesubstrate 5, an impact sound is incurred so as to signal the operator to let go of thepushbutton 10. At the same time, the contact of the stops 4 with thesubstrate 5 also makesreed 1 unable to move downward. Because of the provision of the stops 4, the resilience fatigue of theshort legs 3 can be diminished. - Furthermore, because the keyswitch of this invention has few elements, it is easy to manufacture it.
- Referring to Figs. 2A-C, another keyswitch of this invention includes a corrugated
conductive spring reed 1′ which is in a generally vertical position. A substantiallyvertical substrate 5′ has a thin L-shapedconductive path 6′ and a thick L-shapedconductive path 7′ both positioned in such a manner that thethin path 6′ is separated from thethick path 7′. Twoterminal pins 8′ and 9′ are respectively welded to the thick andthin paths 7′ and 6′. Thereed 1′ is attached at its upper end portion to thethin path 6′ of thesubstrate 5′ and aligned at its lower end portion with thethick path 7′ of thesubstrate 5′. The upper end portion ofreed 1′ functions as a fixed contact. The lower end portion ofreed 1′ includes afirst bent portion 3′ functioning as a movable contact, and a second bent portion 4′ functioning as a stop. Apushbutton 10′ is supported by acompression spring 11′ and aligned with the lower end portion ofreed 1′. When thepushbutton 10′ is depressed as shown by arrow A to contact the second bent portion 4′ as shown by arrow B, the first bent portion 4′ of the lower end portion ofreed 1′ is impelled by it to contact thethick path 7 so as to form a conductive path between the thin andthick paths 6′ and 7′ throughreed 1′. It is easy to understand that thefirst bent portion 3′ and the second bent portion 4′ ofreed 1′ serve the same function and operation as theshort legs 3 and the stop 4 in the embodiment of the present invention shown in Figs. 1A-D. - With this invention thus explained, it is apparent that numerous modifications and variations can be made without departing from the scope and spirit of this invention. It is therefore intended that this invention be limited only as indicated in the appended claims.
Claims (4)
1. A keyswitch comprising:
an electrically insulative substrate (5, 5′) having an upper surface on which electrically conductive first and second paths (6 and 7, 6′ and 7′) are separately formed; and
an electrically conductive spring reed (1, 1′) having a first member (2) secured at its lower end to said first path (6, 6′) of said substrate (5, 5′) for establishing an electrical connection therebetween, a second member (3, 3′) having a lower end positioned separately above said second path (7, 7′) of said substrate (5, 5′), and a stop (4, 4′) extending downward from said reed (1, 1′) and having a lower end which is positioned at a predetermined level slightly higher than said lower end of said second member (3, 3′);
whereby, when said reed (1, 1′) is depressed, said second member (3, 3′) contacts said substrate (5, 5′) just before said stop (4, 4′) contacts said substrate (5, 5′); said reed (1, 1′) may be despressed until said stop (4, 4′) contacts said substrate (5, 5′) so that said second member (3, 3′) makes electrical contact with said second path (7, 7′) of said substrate (5, 5′), thereby completing an electrically conductive path between said first and second paths (6 and 7, 6′ and 7′); after said reed (1, 1′) has been depressed by an operator to contact said second path (7, 7′) with said second member (3, 3′), the operator may let go of said reed (1, 1′) so that said reed (1, 1′) automatically returns to its normal position, permitting said second member (3, 3′) to separate from said second path (7, 7′).
an electrically insulative substrate (5, 5′) having an upper surface on which electrically conductive first and second paths (6 and 7, 6′ and 7′) are separately formed; and
an electrically conductive spring reed (1, 1′) having a first member (2) secured at its lower end to said first path (6, 6′) of said substrate (5, 5′) for establishing an electrical connection therebetween, a second member (3, 3′) having a lower end positioned separately above said second path (7, 7′) of said substrate (5, 5′), and a stop (4, 4′) extending downward from said reed (1, 1′) and having a lower end which is positioned at a predetermined level slightly higher than said lower end of said second member (3, 3′);
whereby, when said reed (1, 1′) is depressed, said second member (3, 3′) contacts said substrate (5, 5′) just before said stop (4, 4′) contacts said substrate (5, 5′); said reed (1, 1′) may be despressed until said stop (4, 4′) contacts said substrate (5, 5′) so that said second member (3, 3′) makes electrical contact with said second path (7, 7′) of said substrate (5, 5′), thereby completing an electrically conductive path between said first and second paths (6 and 7, 6′ and 7′); after said reed (1, 1′) has been depressed by an operator to contact said second path (7, 7′) with said second member (3, 3′), the operator may let go of said reed (1, 1′) so that said reed (1, 1′) automatically returns to its normal position, permitting said second member (3, 3′) to separate from said second path (7, 7′).
2. A keyswitch as claimed in Claim 1 wherein said first member (2) includes a plurality of inclined integral long legs, and wherein said second member (3, 3′) includes a plurality of inclined integral short legs.
3. A keyswitch as claimed in Claim 1 wherein said substrate (5, 5′) is made of ceramic material.
4. A keyswitch as claimed in Claim 3 wherein said electrically conductive first and second paths (6 and 7, 6′ and 7′) are made of thick film conductive materials coated on said substrate (5, 5′).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP88303848A EP0339151A1 (en) | 1988-04-28 | 1988-04-28 | Keyswitch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP88303848A EP0339151A1 (en) | 1988-04-28 | 1988-04-28 | Keyswitch |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0339151A1 true EP0339151A1 (en) | 1989-11-02 |
Family
ID=8200049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88303848A Withdrawn EP0339151A1 (en) | 1988-04-28 | 1988-04-28 | Keyswitch |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0339151A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2771846A1 (en) * | 1997-11-28 | 1999-06-04 | Itt Mfg Enterprises Inc | MULTI-WAY TACTILE ELECTRICAL SWITCH WITH SINGLE-TRIGGER DEVICE |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2706463A1 (en) * | 1976-02-20 | 1977-08-25 | Alps Electric Co Ltd | PUSH BUTTON SWITCHES FOR ELECTRIC CALCULATORS ETC. |
DE3137749A1 (en) * | 1980-09-16 | 1983-01-27 | Alps Electric Co., Ltd., Tokyo | Push button switch |
DE8323340U1 (en) * | 1982-08-24 | 1983-12-01 | Jaeger, 92303 Levallois-Perret, Hauts-de-Seine | Electrical switching contact for a bounce-free pressure point switch |
FR2545976A1 (en) * | 1983-05-12 | 1984-11-16 | Vimercati Off Mec | Sealed switch with cup-shaped housing |
-
1988
- 1988-04-28 EP EP88303848A patent/EP0339151A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2706463A1 (en) * | 1976-02-20 | 1977-08-25 | Alps Electric Co Ltd | PUSH BUTTON SWITCHES FOR ELECTRIC CALCULATORS ETC. |
DE3137749A1 (en) * | 1980-09-16 | 1983-01-27 | Alps Electric Co., Ltd., Tokyo | Push button switch |
DE8323340U1 (en) * | 1982-08-24 | 1983-12-01 | Jaeger, 92303 Levallois-Perret, Hauts-de-Seine | Electrical switching contact for a bounce-free pressure point switch |
FR2545976A1 (en) * | 1983-05-12 | 1984-11-16 | Vimercati Off Mec | Sealed switch with cup-shaped housing |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2771846A1 (en) * | 1997-11-28 | 1999-06-04 | Itt Mfg Enterprises Inc | MULTI-WAY TACTILE ELECTRICAL SWITCH WITH SINGLE-TRIGGER DEVICE |
WO1999028937A1 (en) * | 1997-11-28 | 1999-06-10 | Itt Manufacturing Enterprises, Inc. | Touch-sensitive electric switch with several channels and single triggering element |
US6323449B1 (en) | 1997-11-28 | 2001-11-27 | Itt Manufacturing Enterprises, Inc. | Touch sensitive multiple electrical switch |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3806673A (en) | Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure | |
US7525059B2 (en) | Push switch | |
US4540865A (en) | Push buttons | |
US4017700A (en) | Modular printed circuit board mountable push-button switch with tactile feedback | |
US3928741A (en) | Momentary contact single pole switch | |
KR20020038712A (en) | El sheet and switch comprising the same | |
US3996428A (en) | Pushbutton keyboard assembly with over center diaphragm contact | |
EP1310967A2 (en) | Input device which varies output value in accordance with pressing force | |
US3995129A (en) | Key switch component | |
US4568918A (en) | Keyswitch with decoupling diode | |
US4658104A (en) | Printed wiring board | |
US5294762A (en) | Click-action membrane switch unit | |
US4771143A (en) | Diaphragm keyboard | |
US4689608A (en) | Magnetically snap actuated contact keyboard apparatus | |
US6486427B1 (en) | Electrical switch | |
US4357646A (en) | Capacitive keyswitch with overtravel mechanism on moveable plate | |
US3928736A (en) | Keyboard switch assembly having discrete helical conductors providing wiping action | |
US4314112A (en) | Keyboard having switches with tactile feedback | |
EP0339151A1 (en) | Keyswitch | |
US4000389A (en) | Printed circuit board and contact assembly for keyboard switch assemblies | |
US4325102A (en) | Variable capacitor for use in a keyboard | |
US3707611A (en) | Coding keyboard and electrical switch therefor | |
JP2002278695A (en) | Multi-directional input device | |
US3959611A (en) | Pushbutton keyboard system having plural level wire-like contact | |
EP3806122B1 (en) | A dome actuator structure for use in a dome switch, and dome switch comprising such a structure |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19900502 |