POSITION INDICATOR, CIRCUIT COMPONENT AND INPUT DEVICE
First Claim
1. A position indicator comprising:
- a tubular core member formed by combining a substantially bar-like first magnetic core and a substantially bar-like second magnetic core such that they face each other in a transversal direction thereof to form a through-hole therebetween;
a first coil wound around the tubular core member;
a second coil wound around the second magnetic core;
a substantially bar-like rod inserted into the through-hole of the tubular core member and adapted to indicate a position of the position indicator;
a pen-pressure detecting element for detecting a pressure applied to an end of the rod;
a capacitor connected to the first coil to form a resonant circuit; and
a switch for controlling “
on” and
“
off”
states of the second coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A position indicator includes a tubular core member, a first coil, a second coil, a substantially bar-like rod, a pen-pressure detecting element, at least one capacitor, and a switch. The tubular core member is formed by a substantially bar-like first magnetic core and a substantially bar-like second magnetic core, which are combined in a transversal direction thereof to form a through-hole therebetween. At least one of the first and second magnetic cores may include a recessed portion formed therein extending in the axial direction thereof. The first coil is wound around the tubular core member, and the second coil is wound around the second magnetic core. The rod is inserted into the through-hole of the tubular core member. The pen-pressure detecting element detects a pressure applied to an end of the rod (i.e., the pen tip). The capacitor is connected to the first coil to form a resonant circuit. The switch controls “on” and “off” states of the second coil for the purpose of calculating a rotation angle of the position indicator about its axis.
52 Citations
19 Claims
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1. A position indicator comprising:
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a tubular core member formed by combining a substantially bar-like first magnetic core and a substantially bar-like second magnetic core such that they face each other in a transversal direction thereof to form a through-hole therebetween; a first coil wound around the tubular core member; a second coil wound around the second magnetic core; a substantially bar-like rod inserted into the through-hole of the tubular core member and adapted to indicate a position of the position indicator; a pen-pressure detecting element for detecting a pressure applied to an end of the rod; a capacitor connected to the first coil to form a resonant circuit; and a switch for controlling “
on” and
“
off”
states of the second coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A circuit component comprising:
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a tubular core member formed by combining a substantially bar-like first magnetic core and a substantially bar-like second magnetic core such that they face each other in a transversal direction thereof to form a through-hole therebetween; a first coil wound around the tubular core member; and a second coil wound around the second magnetic core. - View Dependent Claims (16, 17, 18)
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19. An input device comprising:
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(a) a position indicator comprising; a tubular core member formed by combining a substantially bar-like first magnetic core and a substantially bar-like second magnetic core such that they face each other in a transversal direction thereof to form a through-hole therebetween; a first coil wound around the tubular core member; a second coil wound around the second magnetic core; a substantially bar-like rod inserted into the through-hole of the tubular core member and adapted to indicate a position of the position indicator; a pen-pressure detecting element for detecting a pressure applied to an end of the rod; a capacitor connected to the first coil to form a resonant circuit; and a switch for controlling “
on” and
“
off”
states of the second coil, and(b) a position detecting device comprising; an input surface on which the position indicator indicates a position; a coordinate input circuit configured to obtain coordinates of the position indicated on the input surface based on distribution of a magnetic field emitted from the tubular core member of the position indicator; and a rotation angle calculating circuit for calculating a rotation angle of the position indicator about an axis in a direction perpendicular to the input surface based on coordinates obtained when the switch is “
on” and
in the closed state and coordinates obtained when the switch is “
off” and
in the open state.
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Specification
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- Resources
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Current AssigneeWacom Co Limited (Wacom)
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Original AssigneeWacom Co Limited (Wacom)
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InventorsKatsurahira, Yuji, Hosaka, Kimiyoshi, Fujitsuka, Hiroyuki
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current324/207.110
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CPC Class CodesG01D 5/241 by relative movement of cap...G06F 3/03545 Pens or stylusG06F 3/038 Control and interface arran...G06F 3/047 using sets of wires, e.g. c...
