Pointing unit and improved stylus pen
First Claim
1. A pointing unit adapted for a stylus pen, comprising:
- a casing formed in a substantially cylindrical shape;
a support member installed in the interior of the casing, the support member being limited to move in the reverse direction of the opening end of the casing;
a cap member being located close to the opening end of the casing and formed in a cylindrical shape with a dome shape end protruding in the outward direction of the opening end by a predetermined length therefrom and the external diameter being slightly smaller than the internal diameter of the casing, the cap member being limited to move from the predetermined position in the outward direction of the opening end and on the contrary movable freely sliding in the inward direction;
a magnetic member made of magnetic material, arranged close to the inner surface of the dome shape end of the cap member;
a coil member including a magnetic core, interposed between the cap member and the support member; and
an elastic member arranged in a narrow space defined between the coil member and the inner surface of the dome shape end of the cap member to urge said cap member in the outward direction with respect to the coil member so that the dome shape end of the cap member is defined at the predetermined position protruding some length from the opening end of the casing.
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Accused Products
Abstract
The invention relates to a pointing unit adapted for a stylus pen associated with a coordinate data input device which has been commonly used as one of some input devices for a computer system. This pointing unit comprises a casing formed in a substantially cylindrical shape; a support member installed in the interior of the casing, the support member being limited to move in the reverse direction of one end opening of the casing; a cap member formed in the same cylindrical shape as the casing, the external diameter of the cap member being slightly smaller than the internal diameter of the casing, one end of the cap member being formed in a dome shape and arranged close to the end opening so as to protrude a predetermined length of the dome shape end from the end opening of the casing, the cap member being limited to move in the outward direction and on the contrary freely sliding in the inward direction; a core member made of magnetic material arranged close to the inner surface of the dome shape end of the cap member; a coil member made of magnetic material, interposed between the core member and the support member; and an elastic member arranged in a narrow space defined between the coil member and the inner surface of the dome shape end of the cap member to urge the cap member outward in the reverse direction with respect to the coil member so that the dome shape end of the cap member is protruded some length from the opening end of the casing.
125 Citations
13 Claims
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1. A pointing unit adapted for a stylus pen, comprising:
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a casing formed in a substantially cylindrical shape; a support member installed in the interior of the casing, the support member being limited to move in the reverse direction of the opening end of the casing; a cap member being located close to the opening end of the casing and formed in a cylindrical shape with a dome shape end protruding in the outward direction of the opening end by a predetermined length therefrom and the external diameter being slightly smaller than the internal diameter of the casing, the cap member being limited to move from the predetermined position in the outward direction of the opening end and on the contrary movable freely sliding in the inward direction; a magnetic member made of magnetic material, arranged close to the inner surface of the dome shape end of the cap member; a coil member including a magnetic core, interposed between the cap member and the support member; and an elastic member arranged in a narrow space defined between the coil member and the inner surface of the dome shape end of the cap member to urge said cap member in the outward direction with respect to the coil member so that the dome shape end of the cap member is defined at the predetermined position protruding some length from the opening end of the casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A stylus pen for a coordinate data input device comprising:
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a pen casing whose first inner space near one end includes a pointing unit, and the second inner space near the other end includes a core unit, the forward end of which is protruded through an opening formed in the other end; a variable capacitor which supports the core unit, the capacitance of said variable capacitor being varied in response to the pressure applied to the core unit; and a coil for constituting a resonant circuit in combination with the variable capacitor.
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Specification