Two-position pushbutton switch
First Claim
Patent Images
1. A two-position pushbutton switch comprising:
- a first click spring to be inverted by a first working force;
a first switch section to be operated by inversion of said first click spring;
a driving member having a flat portion that opposes and presses said first click spring;
a second switch section laid on a surface of the flat portion of said driving member;
a second click spring to be inverted by a second working force, different from the first working force, so as to operate said second switch section; and
a key top for pressing said second click spring, wherein a cushioning member is placed on at least one of said first and second click springs and said at least one of said first and said second click spring is pressed via said cushioning member, and wherein a surface area of the flat portion of the driving member is at least as large as a surface area of the first and second click springs.
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Abstract
In a two-position pushbutton switch, a cushioning member is placed on at least one of first and second click springs, and the click spring is pressed via the cushioning member, thereby making a first press stroke long. A guide member is provided to guide the motion of a driving member. The driving member is slid along the guide member in the pressing direction of a key top.
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Citations
18 Claims
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1. A two-position pushbutton switch comprising:
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a first click spring to be inverted by a first working force;
a first switch section to be operated by inversion of said first click spring;
a driving member having a flat portion that opposes and presses said first click spring;
a second switch section laid on a surface of the flat portion of said driving member;
a second click spring to be inverted by a second working force, different from the first working force, so as to operate said second switch section; and
a key top for pressing said second click spring, wherein a cushioning member is placed on at least one of said first and second click springs and said at least one of said first and said second click spring is pressed via said cushioning member, and wherein a surface area of the flat portion of the driving member is at least as large as a surface area of the first and second click springs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a casing for holding said key top, wherein an operating portion of said key top is exposed from an opening portion of said casing, and said key top is elastically pressed against said casing and supported therein by said cushioning member.
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5. A two-position pushbutton switch according to claim 1, wherein the first working force for said first click spring is greater than the second working force for said second click spring.
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6. A two-position pushbutton switch according to claim 5, wherein a diameter of said first click spring is smaller than that of said second click spring, and a thickness of said first click spring is greater than that of said second click spring.
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7. A two-position pushbutton switch according to claim 1, wherein said first and second click springs are made of a metal leaf spring and also serve as movable contacts of said first and second switch sections.
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8. A two-position pushbutton switch according to claim 1, further comprising:
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a flexible insulating substrate having fixed contacts for said first and second switch sections, wherein said flexible insulating substrate is bent in the shape-of the letter S and is placed opposed to said first and second click springs.
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9. A two-position pushbutton switch according to claim 1, further comprising:
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a support member for supporting said first switch section, wherein said support member has a plurality of guide projections extending in a pressing direction of said key top, and said driving member is slid along said guide projections in the pressing direction.
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10. A two-position pushbutton switch comprising:
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a first click spring to be inverted by a first working force;
a first switch section to be operated by the inversion of said first click spring;
a driving member having a flat portion that opposes and presses said first click spring;
a second switch section placed on a surface of the flat portion of said driving member;
a second click spring to be inverted by a second working force, different from the first working force, so as to operate said second switch section;
a key top for pressing said second click spring; and
a guide member for guiding a motion of said driving member, wherein said driving member is slid along said guide member in a pressing direction of said key top, wherein a surface area of the flat portion of the driving member is at least as large as a surface area of the first and second click springs. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification