WO2004025677A1 - キ−スイッチ用ダイヤフラムおよびキ−スイッチ - Google Patents
キ−スイッチ用ダイヤフラムおよびキ−スイッチ Download PDFInfo
- Publication number
- WO2004025677A1 WO2004025677A1 PCT/JP2003/011651 JP0311651W WO2004025677A1 WO 2004025677 A1 WO2004025677 A1 WO 2004025677A1 JP 0311651 W JP0311651 W JP 0311651W WO 2004025677 A1 WO2004025677 A1 WO 2004025677A1
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- WO
- WIPO (PCT)
- Prior art keywords
- key switch
- diaphragm
- panel
- contact
- reference surface
- Prior art date
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Classifications
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- 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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
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- 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
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2203/00—Form of contacts
- H01H2203/036—Form of contacts to solve particular problems
- H01H2203/054—Form of contacts to solve particular problems for redundancy, e.g. several contact pairs in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/016—Separate bridge contact
- H01H2205/018—Support points upwardly concave
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/034—Separate snap action
- H01H2215/036—Metallic disc
Definitions
- the present invention relates to a diaphragm and a key switch for a key switch (planar switch) having a conical pedestal portion and a dome-shaped portion on a spherical surface on the conical pedestal portion.
- FIG. 1 is a diagram showing a schematic configuration of a first conventional key switch 100
- FIG. 1A is a plan view of the key switch 100
- FIG. 1B is a diagram showing IB-IB in FIG. 1A. It is a figure showing a section.
- FIG. 2 is a diagram showing a state where the key switch 100 is pressed.
- a conventional key switch 100 used for a push button of a mobile phone is composed of a ring-shaped wiring pattern 2 and a wiring pattern 4 which is arranged substantially at the center of the wiring pattern 2 and is separated from the wiring pattern 2.
- the key switch 100 when used for a device such as a mobile phone, it is generally required that the key switch have durability enough to withstand 100,000 presses or more.
- the key switch diaphragm 102 is It does not shift in the direction along the surface of the substrate 6.
- the periphery of the diaphragm for key switch 102 forms a contact 12, and when the diaphragm for key switch 102 is mounted on the board 6, the wiring pattern formed on the contact 12 and the board 6 2 make electrical contact with each other.
- the diaphragm for key switch 102 is formed by processing a thin metal plate having flexibility and conductivity, for example, and the diaphragm for key switch 102 has an appropriate height.
- the pedestal (pedestal 1) 16 the narrowed side of the pedestal, there is a spherical dovetail projecting upward. With a ⁇ ⁇ 8.
- the key switch 100 was pressed: ⁇ , the pedestal portion 16 of the key switch diaphragm 102 was hardly deformed, and the contact point 104 and the wiring pattern 4 of the substrate 6 were electrically connected to each other. Until they come into contact, the dome-shaped portion 18 is mainly deformed in nature. Therefore, a larger pressing stroke and a larger pressing force can be ensured than when the pedestal portion 16 does not exist, whereby a good click feeling can be obtained.
- the key switch 100 is pushed down in the direction of the substrate 6 as shown in FIG. 2, and when the depression is released, the space surrounded by the substrate 6 and the diaphragm for key switch 102 is released.
- a through hole 20 is provided in the cover film 10 near the periphery of the key switch diaphragm 102.
- a diaphragm for a key switch having a projection 102 in the center thereof, a diaphragm for a key switch 102 and a diaphragm for a key switch. It is conceivable to construct a key switch such as a key switch 200 or a key switch 300 by using 102 C.
- FIG. 3A is a diagram showing a cross section of a second conventional key switch 200.
- the key switch diaphragm 102A of the key switch 200 has a projection 102B protruding to the concave side substantially at the center.
- the contact 104 A and the wiring pattern 4 of the substrate 6 come into contact with each other and are electrically connected.
- FIG. 3B is a diagram showing a cross section of a third conventional key switch 300.
- the key switch diaphragm 102C of the key switch 300 has a plurality (three in this example) of protrusions 102B protruding to the concave side substantially at the center.
- the key switch 300 is pressed down, at least one of the contacts 104 A and the wiring pattern of the board 6 PC orchid 003/011651
- the area of the contact 104 A that contacts the wiring pattern 4 of the substrate 6 is smaller than the contact 104 of the key switch 100. Even if dust such as floss enters, the poor contact of the key switch 200 is less likely to occur than the key switch 100.
- the key switch 300 has a plurality of contacts 104 A, and when the key switch 300 is depressed, at least one of the contacts 104 A contacts with the wiring pattern 4 of the substrate 6. If contact is made, contact failure of the key switch can be avoided, so that contact failure is less likely to occur than with the key switch 200.
- the concave portion (substrate 6 Side; pedestal section 16 side), a projection 102B is formed, so that the contact 104A formed on the tip side of the projection 102B and the wiring pattern 4 of the substrate 6
- key switch 200 key switch 300 is not pressed down as shown in Fig. 3 (A) and Fig. 3 (B)
- the stroke of pressing down is smaller than that of the key switch 100, and a good click feeling may be lost.
- the key switch diaphragm 102 of key switch 200 and the key switch diaphragm 102 of key switch 300 are formed by pressing, for example, by pressing so that the height of the pedestal portion 16 is increased. Then, the key switch diaphragm 102 A and the key switch diaphragm 102 C must be largely plastically deformed, particularly at the pedestal 16, and this large plastic deformation causes the diaphragm 10 10 for each key switch to be deformed. Large residual stress occurs at 2 A and 102 C.
- the diaphragm for key switch 102C has a plurality of protrusions 102B, contact failure is less likely to occur than the key switch 200, but the key switch 3
- the key switch 3 When 0 0 is depressed, when one of the contacts 104A of the key switch diaphragm 102C contacts the wiring pattern 4 on the board 6, the above one contact becomes the key switch.
- Eccentricity with respect to the diaphragm for key switch 102 C the stress unevenly distributed on the diaphragm for key switch 102 C may occur, and the durability may be further deteriorated as compared with the key switch 200.
- FIG. 3C is a sectional view of a fourth conventional key switch 400.
- the diaphragm for key switch 102D of the key switch 400 has a through hole 102E instead of the projection 102B at almost the center.
- the edge of the outer periphery of the through hole 102 E on the substrate 6 side forms a contact 104 B, and the contact 104 B forms the wiring pattern 4 of the substrate 6.
- the edge of the through-hole 102E at the substantially central portion of the key switch diaphragm 102D forms the contact 104B, so the key switch 400 is pushed down.
- the contact 104B can easily come into contact with the spring pattern 4 of the substrate 6, and poor contact can be avoided.
- the depression stroke can be secured without increasing the height of the pedestal portion 16, and a good click feeling can be obtained. Can be.
- the key switch diaphragm 102 D When the key switch 400 is pressed down, the key switch diaphragm 102 D is elastically deformed, and stress concentrates on the outer peripheral edge of the through hole 102 E. Cracks may be generated from the outer peripheral edge toward the outer periphery of the key switch diaphragm 102D, and the durability of the key switch 400 may be degraded.
- the adhesive portion of the cover film 10 is transferred to the wiring pattern 4 of the substrate 6 due to the presence of the through hole 102 E, whereby the key switch is There is a problem that a contact failure of 400 may occur.
- a key switch 100 constituted by using the key switch diaphragm 102 is a pressing member (actuator) for pressing the key switch diaphragm 102.
- the actuator AC 1 is formed integrally with, for example, a sheet-like elastic supporting member (for example, a silicon rubber sheet) (not shown) disposed on the front surface of the key switch 100. Along with one sheet, it is laminated on the key switch substrate 6 and the key switch diaphragm 102, and is installed on the key switch 100. At the time of this installation, the center of the key switch diaphragm 102 is In some cases, the center CL 1 2 of the actuator AC 1 is shifted from the CL 10 by ⁇ L 3.
- the conventional key switch 100 using the key switch diaphragm 102 has a click rate (click feeling), which will be described in detail later, almost in proportion to the displacement amount.
- One of the indicators for objectively indicating pass / fail by numerical values) decreases. In other words, there is a problem that a good click feeling is impaired by the shift amount.
- the above-mentioned problem caused by the displacement of the actuator is a problem that also occurs in the other key switches 200, 300, and 400.
- a diaphragm for a key switch is a first plate panel portion having conductivity, the base portion of which the first plate panel portion is fixed in position with respect to a reference plane.
- a second panel panel portion having conductivity, and having a conductivity, and being formed at a central portion of the plate portion so as to protrude in a direction away from the reference surface, and When an external force is applied to the second panel panel in a direction toward the reference surface, at least a peripheral portion of the central portion comes into contact with the reference surface.
- a diaphragm for a key switch further includes at least one protruding portion formed on the second panel panel portion so as to protrude toward the reference surface.
- a feature is that at least the protrusion contacts the reference surface.
- a diaphragm for a key switch is mounted on a first technical side, and further protrudes from the second panel panel portion in a direction away from the reference plane.
- a third panel panel part having conductivity and being formed, and when an external force is applied to the third panel panel part in a direction toward the reference plane, at least the periphery of the third panel panel part An edge contacts the reference surface.
- a diaphragm for a key switch is provided with an opening formed in the second panel panel portion, wherein the diaphragm is provided on the first technical side.
- the protrusion in the diaphragm for key switch, in addition to the second technical aspect, has three protrusions, and each of the protrusions is 2 is characterized by being arranged at equal intervals on the circumference of a circle centered on the center of the panel panel.
- FIG. 1A is a diagram showing a schematic configuration of a first conventional key switch
- FIG. 1B is a cross-sectional view taken along a line IB in FIG. 1A.
- FIG. 2 is a diagram showing a state in which the first conventional key switch is pressed.
- FIG. 3A is a diagram showing a schematic configuration of a second conventional key switch
- FIG. 3B is a diagram showing a schematic configuration of a third conventional key switch
- FIG. 3C is a diagram showing a fourth conventional key switch
- FIG. 10 is a diagram showing a schematic configuration of a conventional key switch.
- FIG. 4A is a diagram showing a schematic configuration of a key switch diaphragm constituting the key switch according to the first embodiment of the present invention
- FIG. 4B is a cross-sectional view along IVB-IVB in FIG. 4A.
- Fig. 5 (A) shows the key switch composed of the key switch diaphragm when pressed down
- Fig. 5 (B) shows the contact surface pattern when the key switch shown in Fig. 5 (A) is pressed down.
- FIG. 6A is a diagram showing a schematic configuration of a diaphragm for a key switch constituting a key switch according to a second embodiment of the present invention
- FIG. 6B is a diagram when the key switch of FIG. 6B is depressed.
- FIG. 4 is a diagram showing a contact surface pattern of FIG.
- FIG. 7 (A) is a diagram showing a schematic configuration of a key switch diaphragm constituting a key switch according to a third embodiment of the present invention
- FIG. 7 (B) is a key switch of FIG. 7 (A).
- FIG. 9 is a diagram showing a contact surface pattern when the switch is pressed down.
- FIG. 8A is a diagram showing a schematic configuration of a diaphragm for a key switch constituting a key switch according to a fourth embodiment of the present invention
- FIG. 8B is a cross-sectional view along IB-VIB of FIG. 8A.
- FIG. 9 is a diagram illustrating the click rate.
- FIG. 10 is a diagram showing the relationship between the actuator displacement and the click rate of the key switch diaphragm, and the relationship between the actuator displacement and the displacement load of the key switch diaphragm.
- FIG. 4 is a diagram showing a schematic configuration of a key switch diaphragm 30 constituting the key switch 1 according to the first embodiment of the present invention.
- FIG. 4A is a plan view of the diaphragm 30 for the key switch
- FIG. 4B is a view showing a cross section taken along the line IVB-IVB in FIG. 4A.
- FIG. 5 is a diagram showing a state where the key switch 1 constituted by the key switch diaphragm 30 is pressed down.
- the display of the substrate 6, the cover film 10, and the wiring patterns 2 and 4 of the substrate 6 is omitted in order to facilitate the cornering.
- the key switch diaphragm 30 is integrally formed by, for example, pressing a thin plate (for example, a thin metal plate) having flexibility and conductivity.
- the diaphragm for key switch 30 is formed at a substantially central portion of the spherical dome-shaped portion 18 by being squeezed up, so that an outwardly protruding portion protrudes upward (convex side) of the dome-shaped portion 18. It has 3 2. That is, the diaphragm 30 for the key switch is provided on the upper side of the pedestal portion 16 having a truncated cone shape, and has a spherical shape protruding in a direction away from the reference plane PL defined by the conductor pattern 2 (negative Z-axis direction).
- a dome-shaped portion 18 is provided, and an inner surface side (concave side) of the dome-shaped portion 18 is set to a contact point 34 at a substantially central portion of the dome-shaped portion 18, and an outer surface side of the dome-shaped portion 18 is provided.
- the diaphragm 30 for the key switch is made of a thin plate having flexibility and conductivity, and has a frustum-shaped pedestal part 16 and an upper part (constricted side) of the pedestal part. It has a spherical dome-shaped portion 18 protruding to the upper side, and a circular outer protruding portion protruding to the outer surface side (convex surface side; opposite to the pedestal portion side) of the dome-shaped portion 18.
- 3 2 is provided almost at the center of the dome-shaped portion 18, and the inner side of the outwardly projecting portion 32 (the base 16 side; The peripheral edge (the boundary between the outwardly protruding portion 32 and the dome-shaped portion 18) of the concave portion 18 forms the contact point 34.
- the outwardly protruding portion 32 is formed on the upper side of the cylindrical truncated cone-shaped pedestal portion 32 A (the narrowed side of the pedestal portion 32 A), and has a spherical dome shape projecting upward. And a projection protruding from the inner surface side (concave side) of the dome-shaped portion 32B at a substantially central portion of the dome-shaped portion 32B, and a tip portion constituting a contact 38. (Inwardly protruding part) 36 is provided.
- the contact 38 is formed by protruding toward the inner surface side of the outer protruding portion 32 (pedestal portion 16 side; concave side of the dome-shaped portion 18).
- a projection 36 is provided.
- the positive direction means a direction approaching the substrate 6 or the reference plane PL.
- the diaphragm 30 for the key switch undergoes elastic deformation (the dome-shaped part 18 and the dome-shaped part 3 2B of the diaphragm 30 for the key switch are deformed).
- the contact 3 4 and the contact 3 8 of the key switch diaphragm 30 come into contact with the wiring pattern 4 of the substrate 6.
- the contact portion is formed by an annular contact surface C 21 and a circular contact surface C 22 formed substantially at the center inside the contact surface. Is done.
- the dome portion 18 and the pedestal portion 16 have two states: a stable state shown in FIG. 4A and a metastable state shown in FIG. 5A, which is stabilized by applying an external force (positive Z-axis direction). It functions as a first panel panel provided with a trigger mechanism.
- the upper protruding portion 32 functions as a second panel panel portion.
- the peripheral portion 34 functions as a connecting portion connecting the two panel panels. Therefore, the diaphragm 30 for the key switch of the present embodiment is connected to the first panel panels 18, 16 and 18 having the base portion 16 and the plate portion 18 via the connecting portion 34. It is provided with a second leaf spring portion 32 to be connected.
- the outer edge 17 of the plate 18 is fixed in position with respect to the reference plane PL by the base 16.
- the diaphragm for the key switch according to the present invention is not limited to a concentric dish panel as shown in FIG.4A for the first panel panel portion and the second plate panel portion, but is an elliptical dish panel.
- the cross section may be a plate spring as shown in FIGS. 4B and 5 (A). That is, in the present invention, both ends (outer edges) 17 and 17 of the plate portion 18 are fixed in position with respect to the reference plane PL by the base portions 16 and 16, and the second plate spring portion 32 is rotated around the periphery. It has a cross section that is fixed to the first leaf spring portions 18, 18 by the edges 3 4, 3 4 Applied to the diaphragm.
- the contact pattern C 21 of the peripheral portion 34 is not annular but separates into two positions substantially symmetrical with respect to the contact pattern C 22. Exists.
- the contact 38 of the diaphragm 30 for the key switch is at the same level force as the contact 34 slightly higher than the contact 34, that is, the distance between the base and the standing PL is the contact 3 4 Or is located slightly away from the contact point 34 with respect to the PL. Therefore, when the key switch 1 is pressed, the dome-shaped portion 18 as the first leaf spring and the dome-shaped portion 32B as the second panel are appropriately elastically deformed, and the contact 3 4 And the contact 38 come into contact with the wiring pattern 4 (for example, almost simultaneously). As a result, it is possible to avoid a situation in which the click feeling when the key switch 1 is pressed suddenly changes during the pressing.
- the wiring pattern 2 and the wiring pattern 4 of the board 6 are electrically connected to each other via the diaphragm 30 for the key switch.
- the state shown in FIG. 5A becomes unstable, the pressed state is released, and the key switch diaphragm is released. 30 returns to the initial shape (stable state) before elastic deformation.
- the contacts 34 and the contacts 38 of the key switch diaphragm 30 are separated from the wiring pattern 4 of the substrate 6, and the electrical connection between the wiring pattern 2 of the substrate 6 and the wiring pattern 4 is cut off.
- the dome shape is formed.
- the peripheral edge connecting the 518 and the upward projecting portion 32 forms the ring-shaped contact 3 4 surrounding the contact 38.
- the wedge-shaped contacts 34 contact the wiring pattern 4.
- the contact 3 4 and the wiring pattern 4 can be kept in contact. Therefore, it is possible to avoid the occurrence of poor contact when the key switch 1 is pressed.
- the outer diameter of the outwardly protruding portion 32 be not less than 20% of the outer diameter of the diaphragm 30 and not more than 2.5 mm.
- the wedge 34 functions as an electrical contact, and stress distribution around the periphery of the outwardly protruding portion 32 is efficiently performed, thereby improving durability.
- the contact 3 8 contacts the wiring pattern 4 together with the contact 3 4, so the key switch When the switch 1 is pressed, the occurrence of poor contact can be further avoided.
- the protrusion 36 provided at the approximate center of the outwardly protruding portion 32 becomes the wiring pattern 4.
- the spherical dome-shaped portion 32B of the outwardly protruding portion 32 as the second panel panel is not further deformed. As a result, it is possible to prevent the dome-shaped portion 32B from receiving an unnecessary stress, and it is possible to improve the durability of the key switch diaphragm 30.
- an outwardly protruding portion 32 provided substantially at the center of the dome portion 18 of the key switch diaphragm 30 is provided outside the dome portion 18, that is, with respect to the dome portion 18. Projects in the direction away from wiring pattern 4 (Z-axis negative direction). Therefore, even if the height of the pedestal 16 is not increased, the stroke when the key switch 1 is depressed can be secured as large as the conventional key switch 100. The feeling of feeling can be ensured, and the height of the pedestal portion 16 does not need to be increased, so that when the diaphragm 30 for key switch is press-formed, the residual stress generated in the diaphragm 30 for key switch can be suppressed low. Thus, the durability of the diaphragm 30 for the key switch can be improved.
- the key switch 1 has a dome-shaped portion 18 which is a first leaf spring provided with a through hole in the center, and a protruding portion 3 2 which is a second leaf spring. And a peripheral portion 34. Therefore, the stress concentration at the periphery of the hole does not occur, and the durability of the key switch 1 is improved.
- the protrusion 36 provided substantially at the center of the dome-shaped portion 32B may be deleted.
- the cover film 10 Since the protruding portion 32 protrudes in the direction away from the wiring pattern 4 with respect to the dome-shaped portion 18 (the negative direction of the Z axis), the cover film 10 is elastically deformed at this portion to increase the tension and increase the protruding portion. Since the pressure on 32 also increases, it is possible to increase the force for holding the key switch 1 of the cover film 10 by adhesion.
- FIG. 6 is a diagram showing a schematic configuration of a key switch diaphragm 40 constituting a key switch according to a second embodiment of the present invention.
- the key switch diaphragm 40 is provided with a dome-shaped portion 3 of the outwardly protruding portion 32 instead of the projection 36 of the first embodiment substantially at the center of the dome-shaped portion 32B of the outwardly protruding portion 32.
- An outer protruding portion 42 is provided substantially at the center of 2B, and the other points are substantially the same as the key switch diaphragm 30.
- the diaphragm 40 for the key switch is provided with a contact 44 on the inner peripheral side (concave side) of the dome-shaped portion 32B at the approximate center of the dome-shaped portion 32B of the outwardly protruding portion 32.
- the dome-shaped portion 32B is provided with an outwardly projecting portion 42 protruding on the outer surface side (convex side) of the dome-shaped portion 32B so as to be separated from the reference plane PL.
- the outwardly protruding portion 42 is formed on the upper side of the cylindrical truncated cone-shaped pedestal portion 42A (the narrowed side of the pedestal portion 42A), and has a spherical dome shape projecting upward. Part 4 2 B is provided. Therefore, the outwardly protruding portion 42 functions as a third leaf spring portion formed on the upper protruding portion 32 as the second panel panel portion.
- An outer protruding portion 42 is provided in which a peripheral portion (a boundary portion with the outer protruding portion 32) on the surface side (the pedestal portion 16 side) is an annular contact point 44.
- the key switch diaphragm 40 When the center of the key switch constituted by the key switch diaphragm 40 is pressed, the key switch diaphragm 40 is elastically deformed, and the contacts 3 4 and the contacts 4 4 of the key switch diaphragm 40 are connected to the substrate 6.
- Contact wiring pattern 4. As shown in FIG. 6 (B), the contacted portion is formed by an annular contact surface C 31 and an annular contact surface C 32 formed substantially at the center inside the contact surface. . Due to the contact, the wiring pattern 2 of the substrate 6 and the wiring pattern 4 are electrically connected to each other via the diaphragm 40 for the key switch.
- the key switch 1 operates substantially in the same manner as the key switch 1 according to the first embodiment, and has substantially the same effect.
- the contacts 44 are formed in an edge shape, so that even if dust enters the space surrounded by the substrate 6 and the key switch diaphragm 40, even if the dust enters the space.
- the contact 4 4 also makes contact with the wiring pattern 4 ⁇ so that contact failure when the key switch is pressed can be further avoided.
- FIG. 7 is a diagram showing a schematic configuration of a key switch diaphragm 50 constituting a key switch according to a third embodiment of the present invention.
- the key switch diaphragm 5 ⁇ is different from the first embodiment in that a through hole 52 is provided in the center of the dome-shaped portion 32B of the outwardly projecting portion 32 instead of the projection 36.
- the key switch diaphragm 30 is different from the key switch diaphragm 30 in other respects, and is otherwise substantially the same as the key switch diaphragm 30.
- a through hole 52 is provided at a substantially central portion of the outwardly projecting portion 32, and a contact 58 is formed on the inner peripheral side (pedestal 16 side) of the through hole 52. Is formed.
- the key switch diaphragm 50 When the central portion of the key switch constituted by the key switch diaphragm 50 is pressed, the key switch diaphragm 50 is elastically deformed, and the contacts 34 of the key switch diaphragm 50 and the inner surface of the through hole 52 are formed.
- the contact 58 formed on the peripheral edge of the side comes into contact with the wiring pattern 4 of the substrate 6.
- the contacted portion is formed by an annular contact surface C 41 and an annular contact surface C 42 formed substantially at the center inside the contact surface. .
- the key switch 1 According to the key switch composed of the key switch diaphragm 50, the key switch 1 according to the first embodiment operates substantially in the same manner as the key switch 1 and has substantially the same effect.
- the contact 58 is formed in an edge shape, so that even if dust enters the space surrounded by the substrate 6 and the key switch diaphragm 50, In addition to the contacts 3 4, the contacts 58 can easily contact the wiring pattern 4, and a contact failure when the key switch is pressed can be further avoided.
- the key switch used there is no protrusion on the outer side (the side away from the substrate 6) of the dome-shaped portion 32B of the outer protrusion 32, so that the key switch diaphragm 30 and the key switch diaphragm are not provided.
- the height of 50 is lower than that of the key switch diaphragm 40, and the size of the key switch can be reduced by holding down the height of the key switch.
- the key switch 50 is common in that a through hole is provided in the center portion in comparison with the conventional key switch 400, but the through hole (opening) 52 of the key switch 50 is the first key switch 50. It is formed on a second panel 32, which is a panel element independent of the plate spring 18. Therefore, the contact pattern of the key switch 50 is composed of two annular patterns C 41 and C 42 as shown in FIG. 7B, and the stress is appropriately dispersed. But Therefore, stress concentration occurring at the periphery of the opening 52 does not occur, so that the durability of the key is improved.
- Fourth embodiment is common in that a through hole is provided in the center portion in comparison with the conventional key switch 400, but the through hole (opening) 52 of the key switch 50 is the first key switch 50. It is formed on a second panel 32, which is a panel element independent of the plate spring 18. Therefore, the contact pattern of the key switch 50 is composed of two annular patterns C 41 and C 42 as shown in FIG. 7B, and the stress is appropriately dispersed. But Therefore, stress concentration occurring
- FIG. 8 is a diagram showing a schematic configuration of a key switch diaphragm 60 constituting a key switch according to a fourth embodiment of the present invention.
- 8A is a plan view of the key switch diaphragm 60
- FIG. 8B is a view showing a cross section taken along line 1IB-B of FIG. 8A.
- the key switch diaphragm 60 is provided with a plurality of (for example, three) projections 36 on the dome-shaped portion 32 B of the outward protrusion 32, for example, the key switch diaphragm 60 or the outward protrusion 3. 2 is different from the key switch diaphragm 30 according to the first embodiment in that it is provided avoiding the center CL 2 and the vicinity thereof, and the other points are configured in substantially the same manner as the key switch diaphragm 30. ing.
- the diaphragm 60 for the key switch protrudes in the direction toward the reference plane PL on the inner surface side (the pedestal portion 16 side) of the outward protruding portion 32 as the second leaf spring portion to form the contact 38. It has a plurality of protrusions 36 to be formed. Each projection 36 is arranged on the circumference of a circle CL3 centered on the center CL2 of the diaphragm 60 for the key switch. Further, in the present embodiment, the number of the projections 36 is three, and these projections 36 are arranged at equally distributed positions on the circumference.
- the key switch diaphragm of the present embodiment the following effects are obtained in addition to the features already described in the first to third embodiments.
- FIGS. 8A and 8B by forming a plurality of protrusions 36 on the outward protrusion 32, the deformation stress of the dome-shaped portion 32B of the outward protrusion 32 increases, and When an external force from the upper surface acts on the switch diaphragm 60, the surface of the dome-shaped portion 32B is hardly deformed and the dome upper portion 18 is operated by deformation. That is, as shown in FIG. 8B, it is assumed that an external force acts on the key switch diaphragm 60 at a position displaced by ALl.
- the key switch is provided with a substrate (not shown) in which the key switch diaphragm 60 is disposed on one surface in contact with the peripheral portion (contact point 12) of the key switch diaphragm 60.
- the key switch diaphragm 60 is movably fixed in the direction crossing the reference plane PL (for example, the Z direction perpendicular to the key switch), and an external force is applied to the key switch diaphragm 60 in the direction toward the reference plane PL.
- Pressing member (actuator) AC 1 is provided.
- the pressing member A C1 presses the key switch diaphragm 60 via a supporting member (not shown) such as a sheet-like elastic member provided on the front surface of the key switch. More specifically, one end of the pressing member A C 1
- a flat contact portion A C3 is provided at the end facing 60), and the contact portion A C3 moves.
- the contact portion A C3 comes into contact with the diaphragm 60 and applies an external force in a direction toward the reference plane PL (positive Z-axis direction).
- the outwardly protruding portions 32 of the key switch diaphragm 60 are separated from the substrate by the contacts 34 of the key switch diaphragm 60, and the key switch diaphragm 60 maintains a stable state. I'll do it.
- first electrical wiring first conductive pattern
- second electrical wiring second conductive pattern
- the pressing member AC1 presses the keyswitch diaphragm 60 to contact the central contact point of the keyswitch diaphragm 60.
- the contact 38 comes into contact with the first electric wiring of the substrate, the first electric wiring and the second electric wiring are electrically connected to each other via the key switch diaphragm 60.
- the center of the actuator AC 1 is shifted from the center of the key switch diaphragm 60 by 1 as shown in FIG. 8B.
- the outwardly projecting portion 32 is a panel element (second paneling portion) independent of the dome-shaped portion 18 and the like, which are the first panel panel portion, the outwardly projecting portion 32 is formed.
- Fig. 9 is a diagram for explaining the click rate.
- Fig. 10 is the relationship between the displacement of the actuator and the click rate of the key switch diaphragm, the displacement of the actuator and the displacement load value of the key switch diaphragm.
- the click rate is one of the indicators for objectively indicating the quality of the click feeling numerically.
- the horizontal axis in FIG. 9 shows the displacement (stroke) in the moving direction (the Z-axis direction in FIG. 8B) when the diaphragm for the key switch is pressed, and becomes larger as the diaphragm for the key switch approaches the reference plane PL.
- the vertical axis in FIG. 9 shows the load when the key switch diaphragm is pressed.
- the diaphragm for key switch when the diaphragm for key switch starts to be pushed from the normal state (the state in which no external force is applied to the diaphragm), the load gradually increases from “0” force and eventually reaches the maximum value P 1. If the pressing is continued further, the load becomes the minimum value in the stroke amount S3, and then increases.
- the diaphragm for the key switch constitutes a contact structure using a toggle mechanism.
- the contact point at the center of the key switch diaphragm is located on the reference plane PL when the stroke amount S 2 is reached before reaching the stroke amount S 3. In contact with the conductor (first electrical wiring).
- the load at this time is referred to as load P2.
- the horizontal axis in FIG. 10 indicates the displacement L 1 in FIG. 8B, and the vertical axis in FIG. 10 indicates the maximum value load P 1 and the taric rate in FIG. 9, respectively.
- the graph of G 1 shown in FIG. 10 shows the maximum load P 1 of the diaphragm 60 for the key switch, and the graph of G 3 shows the conventional diaphragm 10 2 C for the key switch (see FIG. 3 (B)).
- the maximum value load P1 of is shown.
- the graph of G5 shown in FIG. 10 shows the click rate of the diaphragm 60 for the key switch
- the graph of G7 shows the click rate of the diaphragm 102C for the conventional key switch. As shown in Fig.
- the click rate is a substantially constant value (approximately 40%) regardless of the displacement of the center CL 2 of the key switch diaphragm 60 and the center CL 4 of the actuator AC 1 for the key switch diaphragm 60.
- the displacement amount gradually decreases as the displacement amount between the center of the key switch diaphragm and the center of the actuator increases.
- the click rate has dropped to near “0”.
- the outer diameter d 4 of the key switch diaphragm 60 shown in FIG. 8B is 5 mm
- the outer diameter d 2 of the outwardly protruding portion 32 is 2 mm
- the 102C outer diameter is also 5 mm.
- the outer diameter of the actuator AC 1 is 2 mm.
- each key switch diaphragm is used to compose a key switch, and when the key switch is pressed and stopped, and the key switch is repeatedly turned on and off, the key switch diaphragm and the key switch diaphragm are placed.
- the volume and pressure in the space surrounded by the substrate and the air pressure change, and fine dust along with air enters the surrounded space from a slight gap between the substrate and the outer edge of the key switch diaphragm. May come.
- the fine dust that has entered as described above is the air that enters the space surrounded by the small gap formed almost uniformly along the entire outer periphery of the key switch diaphragm. Interference at the center of the key switch diaphragm tends to converge and accumulate at the center of the key switch diaphragm.
- the key switch is constituted by a diaphragm 60 for the key switch. According to this, since the projections 36 constituting the respective contacts 38 on the inner surface side of the outwardly protruding portion 32 are arranged on the circumference of a circle centered on the center of the key switch diaphragm 60. In other words, since the contact 38 is not formed at the center of the diaphragm 60 for the key switch, fine dust that tends to converge and accumulate at the center of the diaphragm 60 for the key switch is strong. In addition, the occurrence of poor contact due to repeated use of the key switch can be minimized.
- each of the projections 36 constituting each contact 38 on the inner surface side of the outwardly protruding portion 32 is formed by the key switch diaphragm 60 or the outside.
- the protrusions 32 are arranged at three equally spaced positions on the circumference of the circle CL 3 about the center CL 2 of the center CL 2. That is, when the key switch diaphragm 60 is pressed, each projection is defined so that a contact 38 at the tip of each projection 36 and a peripheral contact 34 of the outward projection 32 define one plane.
- the key switch diaphragm is not at a right angle to the surface of the substrate on which the key switch diaphragm is mounted (reference plane PL) but at an angle slightly deviated from the right angle (Z axis). Even if the diaphragm is pressed, any one of the contacts of the diaphragm for the key switch can easily contact the conductor located on the reference plane.
- the number of protrusions constituting the contact on the inner surface side of the outwardly protruding portion 32 may be four or more, but if the number of protrusions is four or more, the configuration of the diaphragm for the key switch becomes complicated. . Then, the internal stress of the diaphragm for the key switch may be increased. Therefore, by setting the number of protrusions constituting the contacts to three, it is possible to simplify the configuration of the diaphragm for the key switch and to avoid the contact failure of the key switch using the diaphragm for the key switch as much as possible. it can.
- the life characteristics of the diaphragm for a key switch according to the present invention are improved because the contact portion 34 with the reference plane PL is provided by further providing a second plate panel portion at the center of the first plate spring portion.
- the stress is appropriately distributed because it bears the stress at the multiple bent portions 17, 34, 35, etc. This is probably because the elasticity of the panel panel was maintained.
- the reason why the life of the key switch diaphragm 60 having a projection is long is that when the same pressing stroke as that of the conventional key switch diaphragm 102C is obtained, the projection 36 is provided on the outward protruding portion 32.
Landscapes
- Push-Button Switches (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03795404A EP1548775B1 (en) | 2002-09-11 | 2003-09-11 | Membrane for key switch and the key switch |
DK03795404.7T DK1548775T3 (da) | 2002-09-11 | 2003-09-11 | Membran til nøgleafbryder og nøgleafbryder |
JP2004535950A JP4029089B2 (ja) | 2002-09-11 | 2003-09-11 | キースイッチ用ダイヤフラムおよびキースイッチ |
US10/527,399 US7205491B2 (en) | 2002-09-11 | 2003-09-11 | Membrane for key switch and the key switch |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-265932 | 2002-09-11 | ||
JP2002265932 | 2002-09-11 | ||
JP2003-110337 | 2003-04-15 | ||
JP2003110337 | 2003-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004025677A1 true WO2004025677A1 (ja) | 2004-03-25 |
Family
ID=31996148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/011651 WO2004025677A1 (ja) | 2002-09-11 | 2003-09-11 | キ−スイッチ用ダイヤフラムおよびキ−スイッチ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7205491B2 (ja) |
EP (1) | EP1548775B1 (ja) |
JP (1) | JP4029089B2 (ja) |
DK (1) | DK1548775T3 (ja) |
TW (1) | TWI236690B (ja) |
WO (1) | WO2004025677A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011034927A (ja) * | 2009-08-06 | 2011-02-17 | Mitsumi Electric Co Ltd | ドーム状ばね及びスイッチ |
KR200462695Y1 (ko) | 2008-10-24 | 2012-09-26 | 주식회사 마그마 | 휴대폰용 키패드 |
JPWO2019087556A1 (ja) * | 2017-10-30 | 2020-10-22 | アルプスアルパイン株式会社 | プッシュスイッチ |
WO2024057583A1 (ja) * | 2022-09-16 | 2024-03-21 | アルプスアルパイン株式会社 | 押圧入力装置 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4513688B2 (ja) * | 2005-08-17 | 2010-07-28 | パナソニック株式会社 | プッシュオンスイッチ |
CN101908428A (zh) * | 2009-06-08 | 2010-12-08 | 深圳富泰宏精密工业有限公司 | 按键结构及应用该按键结构的便携式电子装置 |
CN102339683A (zh) * | 2010-07-23 | 2012-02-01 | 深圳富泰宏精密工业有限公司 | 多功能按键结构 |
JP6501434B1 (ja) * | 2017-10-13 | 2019-04-17 | 不二電子工業株式会社 | ドームコンタクト |
WO2021102386A1 (en) * | 2019-11-22 | 2021-05-27 | Snaptron, Inc. | Multilayer switchdome systems and methods |
CN114779055A (zh) * | 2022-06-20 | 2022-07-22 | 西安交通大学城市学院 | 一种电气控制板自动化检测设备 |
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US4194105A (en) | 1977-01-13 | 1980-03-18 | Itt Industries, Inc. | Switches |
JPS62175535U (ja) * | 1986-04-25 | 1987-11-07 | ||
JPH0391629U (ja) * | 1989-12-28 | 1991-09-18 | ||
JPH05190053A (ja) * | 1992-01-09 | 1993-07-30 | Omron Corp | スイッチ構造 |
JPH0992079A (ja) * | 1995-09-21 | 1997-04-04 | Fuji Polymertech Kk | 低ストロークフィルム皿バネ |
JP2001216865A (ja) * | 2000-02-04 | 2001-08-10 | Fuji Denshi Kogyo Kk | スイッチ |
JP2002216580A (ja) * | 2001-01-18 | 2002-08-02 | Alps Electric Co Ltd | 接点板及び接点板付きシート及びこれを用いたスイッチ装置 |
Family Cites Families (9)
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US2706226A (en) * | 1953-08-18 | 1955-04-12 | Signal Stat Corp | Snap-action vane |
US4195210A (en) * | 1979-02-27 | 1980-03-25 | Kb-Denver, Inc. | Switching assemblies |
JP2001518655A (ja) * | 1997-09-29 | 2001-10-16 | バラタッチ テクノロジー インコーポレイテッド | 一体型スイッチを有するポインティングデバイス |
JP4720064B2 (ja) * | 2000-05-18 | 2011-07-13 | ミツミ電機株式会社 | 改良されたクリックバネを具備するプッシュスイッチ |
JP3765723B2 (ja) * | 2000-11-15 | 2006-04-12 | ホシデン株式会社 | 押しボタンスイッチ |
JP2002245895A (ja) * | 2001-02-14 | 2002-08-30 | Yazaki Corp | ドームスイッチ |
JP3753676B2 (ja) * | 2002-05-31 | 2006-03-08 | 不二電子工業株式会社 | スイッチ |
JP4088577B2 (ja) * | 2003-10-16 | 2008-05-21 | ホシデン株式会社 | プッシュオンスイッチ用可動接点およびプッシュオンスイッチ |
JP4445837B2 (ja) * | 2004-04-21 | 2010-04-07 | ホシデン株式会社 | プッシュオンスイッチ |
-
2003
- 2003-09-10 TW TW092125112A patent/TWI236690B/zh not_active IP Right Cessation
- 2003-09-11 WO PCT/JP2003/011651 patent/WO2004025677A1/ja not_active Application Discontinuation
- 2003-09-11 DK DK03795404.7T patent/DK1548775T3/da active
- 2003-09-11 JP JP2004535950A patent/JP4029089B2/ja not_active Expired - Fee Related
- 2003-09-11 US US10/527,399 patent/US7205491B2/en not_active Expired - Fee Related
- 2003-09-11 EP EP03795404A patent/EP1548775B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4194105A (en) | 1977-01-13 | 1980-03-18 | Itt Industries, Inc. | Switches |
JPS62175535U (ja) * | 1986-04-25 | 1987-11-07 | ||
JPH0391629U (ja) * | 1989-12-28 | 1991-09-18 | ||
JPH05190053A (ja) * | 1992-01-09 | 1993-07-30 | Omron Corp | スイッチ構造 |
JPH0992079A (ja) * | 1995-09-21 | 1997-04-04 | Fuji Polymertech Kk | 低ストロークフィルム皿バネ |
JP2001216865A (ja) * | 2000-02-04 | 2001-08-10 | Fuji Denshi Kogyo Kk | スイッチ |
JP2002216580A (ja) * | 2001-01-18 | 2002-08-02 | Alps Electric Co Ltd | 接点板及び接点板付きシート及びこれを用いたスイッチ装置 |
Non-Patent Citations (1)
Title |
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See also references of EP1548775A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200462695Y1 (ko) | 2008-10-24 | 2012-09-26 | 주식회사 마그마 | 휴대폰용 키패드 |
JP2011034927A (ja) * | 2009-08-06 | 2011-02-17 | Mitsumi Electric Co Ltd | ドーム状ばね及びスイッチ |
JPWO2019087556A1 (ja) * | 2017-10-30 | 2020-10-22 | アルプスアルパイン株式会社 | プッシュスイッチ |
WO2024057583A1 (ja) * | 2022-09-16 | 2024-03-21 | アルプスアルパイン株式会社 | 押圧入力装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1548775B1 (en) | 2010-08-11 |
DK1548775T3 (da) | 2010-11-22 |
JPWO2004025677A1 (ja) | 2006-01-12 |
US20060016679A1 (en) | 2006-01-26 |
EP1548775A4 (en) | 2008-05-07 |
JP4029089B2 (ja) | 2008-01-09 |
EP1548775A1 (en) | 2005-06-29 |
TW200414252A (en) | 2004-08-01 |
TWI236690B (en) | 2005-07-21 |
US7205491B2 (en) | 2007-04-17 |
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