Abstract: The invention provides a movable contact for a two-step push-on switch which can realize an excellent sense and a long life period while decreasing the width, even on a flat stationary-contact forming surface of a printed circuit board, a flexible printed circuit board or the like, and also a two-step push-on switch. A movable contact has: a rectangular annular peripheral plate portion 2; an oval center plate portion 3 which is upward inflatingly curved; and a pair of connecting plate portions 4, 4 which connect an inner edge of the peripheral plate portion 2 to an outer edge of said center plate portion 3 on a center line X which is parallel to long side portions 2a, 2a of said peripheral plate portion 2. The movable contact is disposed on a flat stationary-contact forming surface of a printed circuit board, a flexible printed circuit board, or the like, and an adhesive tape 9 for fixing the movable contact is bonded from a side of the upper face, thereby configuring a push-on switch.

Abstract: A push switch includes a case made of insulating resin including a plate-like portion shaped substantially like a plate, a first fixed contact exposed at a first surface of the plate-like portion of the case, a second fixed contact exposed at the first surface of the plate-like portion of the case, and a movable contact which electrically connects and disconnects the first fixed contact to the second fixed contact. A first metal member including the first fixed contact further includes a first terminal exposed outside the case, and a first middle portion exposed at a second surface of the plate-like portion of the case, the first middle portion connecting the first fixed contact to the first terminal. A second metal member including the second fixed contact further includes a second terminal exposed outside the case, and a second middle portion for connecting the second fixed contact to the second terminal.

Abstract: A two-step switch, which may be minimized in radial direction and is suitable for PCB or FPC circuit board, has a first contact spring, having outer peripheral contacts in regular contact with first fixed contacts and having an inner contact inside the outer peripheral contacts and reversed by depressing, and a second contact spring, stacked on the first contact spring via an insulation sheet, having an outer peripheral contact in regular contact with a second fixed contact and having an inner contact inside of the outer peripheral contact and reversed by depressing. Through a first depressing, the inner contact of the first contact spring is reversed and in contact with the inner contact of the second contact spring, whereby a first electric circuit is actuated. Also through a second depressing, the inner contact of the second contact spring is reversed and in contact with the third fixed contact, whereby a second electric circuit is actuated.

Abstract: A push-button switch includes insulating member having a surface, first and second stationary contacts electrically isolated from each other and provided at the surface of the insulating substrate, and a movable contact. The movable contact includes an elastic metal base having a dome-shape and having a concave surface spaced from the first stationary contact and an outer rim mounted on the second stationary contact, a nickel plated layer provided on the concave surface of the elastic metal base and having a thickness ranging from 0.05 ?m to 0.5 ?m, a copper plated layer provided on the nickel plated layer and having a thickness ranging from 0.05 ?m to 0.7 ?m, and a silver plated layer provided on the copper plated layer and having a thickness ranging from 0.1 ?m to 2 ?m. The push-button switch has a long operating life time, has a stable contact resistance, and is inexpensive.

Abstract: Parts of a base film that correspond to respective movable contacts are formed into projections. Operating projections each including a projecting member fixed to a top surface of the base film by an adhesive resin are formed and correspond to the movable contacts, respectively. The adhesive resins have different fixed diameters.

Abstract: In a metal dome sheet to be hermetically adhered to a plurality of metal domes disposed at electrodes on a substrate and to other portions of the substrate via an adhesive layer, the present invention provides an adhesive layer removed portion at a portion of the adhesive layer between at least two adjacent metal domes as an air escape portion. Accordingly, it is possible to obtain a thin and light switch panel, which is also excellent in water resistance and dust resistance.

Abstract: A keypad with both elevated and non-elevated key regions, and key switches disposed beneath both types of key regions. The non-elevated key regions each provide corresponding character output based on an operation algorithm that considers activation of at least one adjacent elevated key region as well as activation of the switch below the non-elevated key region. The keypad includes a keymat that is rigidly held at its perimeter in a stretched condition across a switch substrate. The key switches include metal snap domes that have an elevated central region forming a downwardly facing cavity defined at its edge by a ridge disposed above the switch contacts that electrically engages multiple switch contacts in an annular contact zone.

Abstract: A keypad of a mobile communication terminal includes a contact sheet having contacts preferably shaped as hemispherical domes which deflect to turn on/off switch contact point pairs on a printed circuit board. The contact sheet further includes band parts covering the domes and an insulating sheet having at least one pair of semicircular openings for exposing portions of the domes. The insulating sheet is preferably made of a light-reflecting material/color which disperses light to illuminate keys of the keypad.

Abstract: A movable contact unit including movable contacts localized in respective through holes of a base sheet formed from a flexible insulation substrate; a cover sheet formed from a flexible insulation substrate bonded on upper surface of the base sheet to hold respective movable contacts in the through holes; a weak adhesive layer applied on bottom surface of the base sheet of the movable contact unit except the through holes; and the movable contact unit bonded on stationary contact substrate having corresponding stationary contacts to respective movable contacts using the weak adhesive layer.

Abstract: The present invention provides a mini switch assembly at low costs and being able to display on or off state of it. The switch assembly in accordance with the present invention includes a pushbutton that has an opening allowing a transparent cover installed in it; a circuit board having a circuit and defining a first conductive section being insulated with a second conductive section; a conductive elastic part coupled to but its body section separated from the first conductive section. When the pushbutton applies a force to the elastic part, the body section is forced to contact the second conductive section and as a result, the first conductive section is conductively coupled with the second conductive section, triggering a drive circuit on the circuit board to provide power to turn the LED on. Also, the elastic part has an opening aligned with the pushbutton opening to allow the LED to be installed on the circuit board via these two openings.

Abstract: A push switch includes a switch contact section including first and second contacts, and an elastic element for connecting the first and second contacts by pushing the first contact. The elastic element includes a columnar portion for connecting the first and second contacts by pushing the first contact, a hollow conical portion extending from a junction positioned at an end of the columnar portion, the conical portion having a truncated conical shape, and a thick portion provided at a whole circumstance of the junction.

Abstract: A first stationary contact is provided on the base body. A second stationary contact is provided on the base body. A conductive click spring is disposed over the first stationary contact and the second stationary contact, so as to be always electrically connected to the first stationary contact and so as to be away from the second stationary contact in a neutral position thereof. A push button includes a head portion which is depressed by an operator, and an actuator which pushes the click spring so as to be abutted against the second stationary contact when the head portion is depressed. The head portion and the actuator is integrally formed from rubber having elastic restorability.

Abstract: There is provided a contact spring in a small-sized push-button switch capable of lessening contact obstacle between contacts caused by fine dust, and reducing variation in load characteristics even if heat is applied thereto or the switch is repetitively operated.

Abstract: A key pattern connecting device for a domed metal switch. The domed metal switch includes first and second contact parts arranged in a key matrix on a main board. The key pattern connecting device comprises at least one first contact part electrically connected to columns by means of main connection patterns on the main board, at least one second contact part electrically connected to rows by means of the main connection patterns, a plurality of domed metal keys provided to the surfaces of the contact parts, respectively, and a flexible circuit attached to the main board in such a manner that the keys are projected through the flexible circuit. The flexible circuit has a plurality of connection patterns formed in such a manner that the connection patterns come into contact with the keys connected to the columns and the keys connected to the rows, respectively.

Abstract: A resilient switch contact for a key switch device includes a unitary conductive body that has a mounting end portion disposed in a first plane, a central operating portion disposed in a second plane spaced apart from the first plane in a first direction, an intermediate buffer portion interconnecting the mounting end portion to the central operating portion, and first and second support portions spaced apart from each other in a second direction transverse to the first direction and extending from the central operating portion in the first direction toward the first plane.

Abstract: The present invention includes a new dome contact construction having an integral insulative layer that is precisely cut and aligned with the dome contact mechanism during fabrication. Prior to feeding the metal sheets or strips into the equipment for stamping and cutting the dome contact using the conventional method, a die cut layer of film is applied to one side of the sheet or strip. The film is cut into the shape of the desired insulative layer in the finished switch product and has periodic openings that correspond to the areas of the dome contact that are required to be uncovered both to provide electrical conductivity as a part of the proper function of the switch. The sheet of metal, including the laminate film, is cooled to a temperature near freezing to facilitate clean stamping of the laminated feedstock during the stamping process and is then fed into the forming and cutting press where the domes are formed and stamped.

Abstract: A tact switch (100) includes a top cover (1), an actuator (2), a metal dome (3), a rubber disc (4), a conductive disc (5) and a housing (6). The housing has four contacts (7) retained therein. The rubber disc is attached to an underside of the metal dome, and the conductive disc is attached to the rubber disc. The metal dome fits into a bottom of the housing with the conductive disc spaced a short distance above the contacts. The actuator is slidably mounted above the metal dome. The top cover is mounted on the housing and includes a plate (11) with a curved lever (12) extending therefrom. The curved lever confronts a ramp (211) of the actuator. In operation, when the actuator is pressed into the housing, the lever of the top cover is forced downwardly by the ramp of the actuator to depress the metal dome, which pushes the conductive disc into electrical connection with the contacts.

Abstract: The double action push switch has a longer life and more design freedom for attaining desired load characteristics for first and second switching actions so that it occupies less area on a printed circuit board. Two plate members are housed side-by-side in a cavity of the push switch. An operating portion of a key top is positioned so that P3≠P4, where P3 and P4 are the respective operating loads applied to the operating portion when one or the other of two pressing points act as the fulcrum and moments on the key top are balanced. The operating portion is positioned offset from a center vertical axis of the key top if both plate members have the same load characteristics. Thus, a first pressing force inverts one plate member for a first electrical connection, and the next pressing force inverts the other plate member for a second electrical connection.

Abstract: The first movable contact including a ring portion and projections extended in same width as the ring is arranged against the peripheral fixed contacts and the central fixed contact at the bottom of the switch case in such manner that the ring portion confronts the peripheral fixed contacts at spaced intervals apart.

Abstract: The apparatus (10) includes a depressible member (20), a first membrane (30), and a second membrane (40). The depressible member (20) has an unactuated condition and an actuated condition. The first membrane (30) is connected with the depressible member (20). The first membrane (30) resists movement of the depressible member (20) from the unactuated condition to the actuated condition. The first membrane (30) further provides an increasing return force (91) urging the depressible member (20) to the unactuated condition as the operator moves the depressible member from the unactuated condition to the actuated condition. The second membrane (40) resists movement of the depressible member (20) to the actuated condition. The second membrane (40) further provides an increasing return force (92) to the depressible member (20) as the operator moves the depressible member from the unactuated condition to the actuated condition.

Abstract: A tact switch (1) includes a housing (10) defining a cavity (1000) in a middle thereof, a first contact (11) and a second contact (12) received in a portion of the housing under the cavity, a dome-shaped metal spring (13) mounted in the cavity, a seal pad (14) mounted on a top of the housing, a metal shell (15) covering the housing, and a push button (16) engaging with the shell and attached on the seal pad. The shell comprises a base portion (153), and three sidewalls (151) and a tab (152) respectively perpendicularly depending from edges of the base portion. The seal pad is substantially rectangular, and frictionally fitted between two opposite of the sidewalls and the tab at an underside of the base portion. Therefore, the seal pad is securely retained in a correct position in the shell in assembling.

Abstract: A tact switch includes an insulative housing, a plurality of fixed contacts retained in the insulative housing, a movable contact, an actuator and a top cover. Each fixed contact portion exposed on the bottom wall of the insulative housing. The top cover is mounted on the housing and has an engaging plate projecting downwardly therefrom. The movable contact is positioned between the fixed contacts and the top cover and has a plurality of projections projecting therefrom. The actuator has an operating portion and a press portion slidably mounted between the top cover and the movable contact. In operation, when the operating portion is pressed inwardly, the movable contact elastically deforms such that the plurality of projections move downwardly to electrically contact with the plurality of contact portions.

Abstract: The present disclosure relates to tactile switch assemblies having stepped printed circuit boards for use with snap-domes in surgical instruments. In accordance with one aspect of the present disclosure a tactile switch assembly for use with a surgical instrument includes a substrate, an inner terminal disposed on an upper surface of the substrate and having a first height, an outer terminal disposed on the upper surface of the substrate and substantially surrounding the inner terminal and having a second height which is greater than the height of the inner terminal and a snap-dome secured to the substrate and having a periphery engaged to and in electrical communication with the outer terminal. The snap-dome is depressible through a range wherein, upon inversion of the snap-dome, an apex of the snap dome electrically connect the inner and outer terminals.

Abstract: A sump pump switch for controlling the application of power from a power source to a sump pump motor in response to the rise and fall of a liquid collecting in a sump includes a housing, a pair of electrically conductive terminal members fixedly disposed within the housing and a pair of electrically conductive contact members fixedly disposed within the housing. A pair of electrically conductive movable contacts are mounted onto a contact bridge. The contact bridge is pivotally disposed within the housing and is actuated by an over-center mechanism. The movable contacts are pivotally coupled to the terminal members and selectively contact the contact members to effectively close the switch. A pair of electrically conductive wiper contacts connect the terminal members with the contact members and provide a non-articulating current path between the terminal members and the contact members.

Abstract: An electrical switch (100) includes an insulative housing (4) having four stationary contacts (5) retained therein, a movable contact plate (3), an actuator (2), and a top cover (1). The movable contact plate is made of a conductive material and has four electrically conductive arms (34) bending slightly downwardly therefrom. The movable contact plate is positioned in the insulative housing and the actuator is slidably positioned within the housing above the contact plate. The top cover attaches to a top of the housing, securely retaining the contact plate and the actuator within the housing. When the actuator is pressed inward into the housing, it forces the contact plate to move downwardly and the conductive arms electrically connect to the stationary contacts.

Abstract: A tact switch (100) includes a top cover (1), an actuator (2), a metal dome (3), a rubber disc (4), a conductive disc (5) and a housing (6). The housing has four contacts (7) retained therein. The rubber disc is attached to an underside of the metal dome, and the conductive disc is attached to the rubber disc. The metal dome fits into a bottom of the housing with the conductive disc spaced a short distance above the contacts. The actuator is slidably mounted above the metal dome. The top cover is mounted on the housing and includes a plate (11) with a curved lever (12) extending therefrom. The curved lever confronts a ramp (211) of the actuator. In operation, when the actuator is pressed into the housing, the lever of the top cover is forced downwardly by the ramp of the actuator to depress the metal dome, which pushes the conductive disc into electrical connection with the contacts.

Abstract: The present disclosure relates to tactile switch assemblies having stepped printed circuit boards for use with snap-domes in surgical instruments. In accordance with one aspect of the present disclosure a tactile switch assembly for use with a surgical instrument includes a substrate, an inner terminal disposed on an upper surface of the substrate and having a first height, an outer terminal disposed on the upper surface of the substrate and substantially surrounding the inner terminal and having a second height which is greater than the height of the inner terminal and a snap-dome secured to the substrate and having a periphery engaged to and in electrical communication with the outer terminal. The snap-dome is depressible through a range wherein, upon inversion of the snap-dome, an apex of the snap dome electrically connect the inner and outer terminals.

Abstract: A first fixed contact is mounted on an upper surface of a circuit substrate, and a second fixed contact is mounted on the upper surface of a circuit substrate around the first fixed contact. A movable contact having a semicircular sectional shape is mounted on the second fixed contact, and terminal electrodes are provided on an underside of the circuit substrate and connected to the first and second fixed contacts respectively. A spacer is mounted on the circuit substrate so as to surround the movable contact, and a cover is mounted on the spacer to cover the movable contact.

Abstract: The present invention has as its object to provide a push switch utilizing a click spring with superior electrical conduction during operation of the switch. The push switch 20 of the present invention has a fixed contact 4, and a spherical click spring that contacts the fixed contact 4 and acts as a traveling contact, the click spring 10 having a projection 11a that projects upward from a central part of the click spring 10, and further, an aperture part 11 formed inside the projection so as to be open at the bottom. When the projection 11a is pressed downward the bottom edge 11b of the aperture part and the fixed contact 4 form a line contact (see FIG. 2).

Abstract: The present invention includes a new dome contact construction having an integral insulative layer that is precisely cut and aligned with the dome contact mechanism during fabrication. Prior to feeding the metal sheets or strips into the equipment for stamping and cutting the dome contact using the conventional method, a die cut layer of film is applied to one side of the sheet or strip. The film is cut into the shape of the desired insulative layer in the finished switch product and has periodic openings that correspond to the areas of the dome contact that are required to be uncovered both to provide electrical conductivity as a part of the proper function of the switch. The sheet of metal, including the laminate film, is cooled to a temperature near freezing to facilitate clean stamping of the laminated feedstock during the stamping process and is then fed into the forming and cutting press where the domes are formed and stamped.

Abstract: There is provided a switch which is excellent in stability in electric contact between an edge part of a contact spring and a fixed contact part, ensures a stroke required for an eccentric load which is imposed on the contact spring and reduces variations in clicking feeling without shortening a life of the dome-shaped contact spring which can be clicked. A depression is formed on an inner central part of the contact spring, namely, on a movable contact part and the edge part formed on the periphery of the depression is allowed to contact the surface of the fixed contact part by a line contact, thereby ensuring electric stability of contact between the edge part and the fixed contact part. Since the movable contact part has no hole, no dust enters the switch, thereby preventing a life of the contact spring from being shortened.

Abstract: A tact switch has a seat body which has a housing compartment for housing a first conductive electrode and a second conductive electrode, a first elastic element located in the housing compartment above the first and the second conductive electrodes, a press set located in the housing compartment above the first elastic element, and a closure body fastened to the seat body to cover the housing compartment. The press set further includes a hat body which has a coupling section and a second elastic element coupled with the coupling section. The coupling section has an opening and a directing section formed on the periphery of the opening with an inner diameter greater than the coupling section, and a chamfered edge located between the directing section and the coupling section to facilitate insertion and assembly of the second elastic element in the coupling section.

Abstract: In a switch, an elastic member made of elastic material includes a bar section, a conical section at its upper portion functioning as a first deforming section, and a second deforming section at its lower portion. A movable contact in a switch case is pushed with the lower end portion of the second deforming section. A bar section of an elastic element projects through a central hole of a cover fixed to the switch case. In this switch, a pushing force applied to the elastic element deforms the first deforming section elastically, and then the second deforming section deforms elastically, and thus, the switch operates. The switch can absorb fluctuations due to combination of components of an electronic appliance, and stabilize its manipulation feeling through eliminating looseness of an operation button of the appliance.

Abstract: There is provided a switch which is excellent in stability in electric contact between an edge part of a contact spring and a fixed contact part, ensures a stroke required for an eccentric load which is imposed on the contact spring and reduces variations in clicking feeling without shortening a life of the dome-shaped contact spring which can be clicked. A depression is formed on an inner central part of the contact spring, namely, on a movable contact part and the edge part formed on the periphery of the depression is allowed to contact the surface of the fixed contact part by a line contact, thereby ensuring electric stability of contact between the edge part and the fixed contact part. Since the movable contact part has no hole, no dust enters the switch, thereby preventing a life of the contact spring from being shortened.

Abstract: A push switch includes a case made of insulating resin including a plate-like portion shaped substantially like a plate, a first fixed contact exposed at a first surface of the plate-like portion of the case, a second fixed contact exposed at the first surface of the plate-like portion of the case, and a movable contact which electrically connects and disconnects the first fixed contact to the second fixed contact. A first metal member including the first fixed contact further includes a first terminal exposed outside the case, and a first middle portion exposed at a second surface of the plate-like portion of the case, the first middle portion connecting the first fixed contact to the first terminal. A second metal member including the second fixed contact further includes a second terminal exposed outside the case, and a second middle portion for connecting the second fixed contact to the second terminal.

Abstract: The first movable contact including a ring portion and projections extended in same width as the ring is arranged against the peripheral fixed contacts and the central fixed contact at the bottom of the switch case in such manner that the ring portion confronts the peripheral fixed contacts at spaced intervals apart.

Abstract: An annular first fixed contact is provided on a substrate, and a second fixed contact is provided on the substrate within the first fixed contact. A spherical spring contact having legs is mounted on the first fixed contact by the legs.

Abstract: A key input device for portable terminals and the like, having a reduced sized and improved key input operation. The device has a wiring substrate, multiple keys on the substrate, with each key having three-dimensional displacement surfaces that are displacable in a linked fashion relative to one another. The displacement surfaces have a preceding displacement surface and a succeeding displacement surface corresponding respectively to a preceding and a succeeding key displacement. A first switching operation occurs when a first key part of a first key and first substrate part of the wiring substrate are brought into mechanical contact with each other on the basis of displacement of the preceding displacement surface. A second switching operation results when a second key part of a second key and a second substrate part of the wiring surface are contacted on the basis of displacement of the succeeding displacement surface.

Abstract: A first stationary contact is provided on the base body. A second stationary contact is provided on the base body. A conductive click spring is disposed over the first stationary contact and the second stationary contact, so as to be always electrically connected to the first stationary contact and so as to be away from the second stationary contact in a neutral position thereof. A push button includes a head portion which is depressed by an operator, and an actuator which pushes the click spring so as to be abutted against the second stationary contact when the head portion is depressed. The head portion and the actuator is integrally formed from rubber having elastic restorability.

Abstract: Fixed contacts 11, 12, 13 and 14 are provided on the bottom face 10B of recess 10A in switch housing 10. Two contact-receptors 10C, 10D are disposed at corners so as to confront each other on the bottom face 10B. Outer rim 15B of domed movable contact 15 made of thin metal plate and bowed upwardly is placed on the receptors so that a lower face of top 15A of movable contact 15 faces fixed contacts 11, 12, 13 and 14. Flexible film 16 is fixed so that film 16 covers recess 10A and accommodates domed movable contact 15.

Abstract: A thin push switch used in a portable electronic apparatus includes a less number of components jointed together without any adhesive controlled hardly, and can thus be favored with mass production. The push switch includes an insulating spacer having first cramp-locked tabs cramp-locked with the first terminals of a fixed plate and second cramp-locked tabs cramp-locked with the second terminals of a contact plate. The fixed plate includes a fixed contact, and the contact plate includes a movable contact. Accordingly, the contact plate, the insulating spacer, and the fixed plate can be joined together without an adhesive.

Abstract: An electrical switch assembly includes a dome-shaped switching element (100) that closes a switch when the dome center portion (118) is depressed against a terminal (104, 106), wherein an actuator member (36) has a lower portion (44) that extends through a hole (120) in the dome element and into a bore (46) that guides the actuator member lower portion in sliding movement. A coding wheel (52) that is fixed to the actuator member, includes a conductive portion (60) with at least one contacting tooth (62) and a non-contacting part or space (200) that both lie on an imaginary circle (220). A plurality of pairs of contacts (74, 84, 86) are in vertical alignment with the circle, and each contacting tooth engages a selected pair of the contacts in a selected rotational position of the actuation member about its vertical axis A.

Abstract: A spring coupled to a multi-layered flex membrane is described. In one embodiment, the spring may be a layer coupled to the top layer of a key switch membrane. In another embodiment, the spring may be coupled to the key switch between a top layer and a spacer layer. The spring or spring layer may increase the resiliency of the key switch membrane to prevent the flex membrane from deforming.

Abstract: A peripheral fixed contact having a circular hole is secured to a substrate, and a central fixed contact having a hole at a central portion thereof is secured to the substrate within the circular hole of the peripheral fixed contact. A spherical spring contact is mounted on the peripheral fixed contact so as to contact with an edge of the hole of the central fixed contact.

Abstract: A membrane switch fixes click springs at fixed positions and largely reduces the damage caused by dust and moisture affecting contact points. The membrane switch includes fixed contact points on a circuit board made from a film of resin material such as polyester. A movable contact point member is made of semi-spherical metal click spring touching the contact points. An insulation sheet is adhered to the circuit board including the click spring, characterized by a continuous air path connected to a portion of the click spring, which is formed as a portion where no adhesive material is placed, between the insulating sheet adhered to the top face of the click spring. The continuous air path is connected to the openings formed between an edge of the insulation sheet and an edge of the circuit board.

Abstract: A contact structure of a switch comprises a first contact (1), and one or more doughnut-like second contacts (2) surrounding the first contact (1), and the second contacts (2) are provided with one or more band-like contacts (3a), (3b), (3c), (3d) extending to the opposite side from the first contact (1). With this structure, an area of a metal pattern portion of the second contact (2) becomes smaller as compared with prior art. In a compact electronic device used for a numeric keypad of a mobile telephone or the like, the contact structure can be reduced in size and weight to the utmost and resources can be saved to the utmost.

Abstract: The present invention has as its object to provide a push switch utilizing a click spring with superior electrical conduction during operation of the switch.

Abstract: A movable contact structure which, even when used in a planar circuit board, can provide a crispy click feeling and will not fail to return to an original position after being inverted is to be provided. The structure consists of a disc formed into a dome shape by cupping a center of a thin metallic sheet in one direction, provided with a skirt rising at a prescribed angle from an outer circumference of this disc toward a center of the disc, and a dome which is continuous from this skirt and can be repetitively inverted, the connecting part between the skirt and the dome being formed in multiple steps via a plurality of bent portions.

Abstract: An electrical switch includes a snap dome tripper (36) whose center portion (37) snaps down when depressed by a predetermined amount, and a contact plate (44) with blades (50) that move down against terminals (26) to close the switch when the tripper snaps down, and to provide tactile feedback when the switch is closed. Instead of the center portion of the contact plate lying under the center portion of the tripper, the contact plate lies above the tripper and the contact blades project horizontally beyond the boundaries of the periphery of the tripper.

Abstract: A first fixed contact is mounted on an upper surface of a circuit substrate, and a second fixed contact is mounted on the upper surface of a circuit substrate around the first fixed contact. A movable contact having a semicircular sectional shape is mounted on the second fixed contact, and terminal electrodes are provided on an underside of the circuit substrate and connected to the first and second fixed contacts respectively. A spacer is mounted on the circuit substrate so as to surround the movable contact, and a cover is mounted on the spacer to cover the movable contact.