US 5,895,895 AGranted

Input pen

AssigneesPilot Precision Kabushiki Kaisha, Graphtec Corporation, Kabushiki Kaisha Pilot Corporation

InventorsKazuhiko Ono, Shinya Kamei

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Abstract

In an input pen for transmitting to a tablet 19 information of variation in writing pressure as well as information of designated positions, a joint 10 is mounted on the rear end of a shaft a writing tip 12. A movable magnetic core 9 is attached to the joint 10. A push rod 13 is passed in the pen body in such a manner that longitudinal position of the push rod is controllable, with a resilient member 11 interposed between the push rod 13 and the joint 10. Longitudinal position of the push rod 13 is adjusted in order to control the load upon mounting of the resilient member 11. It is thus possible to control the load upon mounting of the resilient member 11 biasing the writing tip 12 forward by adjusting the position of the push rod 13, whereby the resilient member 11 can be mounted constantly under a predetermined load independently of variation in dimensions of components. A reliable detection of writing pressure applied to the writing tip 12 by operator's hand is therefore made possible.

Claims21

Dependent claims

An input pen comprising:

a pen body;
an electric coil including a bobbin and an electric wire wound therearound, said bobbin being secured within said pen body and having a longitudinal through-hole extending therein;
a writing tip member having a shaft extending rearward and fitted slidably within said pen body, said writing tip member having a writing tip projecting beyond a forward end of said pen body;
a movable magnetic core fitted in said through-hole of the coil and connected with said writing tip member with respect to a longitudinal direction of the pen body;
a fixed magnetic core provided within said through-hole;
said writing tip upon writing being pressed into said pen body to displace said movable magnetic core relative to said fixed magnetic core, thereby producing a variation in inductance of said coil, said variation providing information of a variation in writing pressure;
a joint secured both to said shaft of said writing tip and to said movable magnetic core;
a push rod received within said pen body at a rear of said joint for longitudinal displacement;
resilient means interposed between said push rod and said joint;
and
means for adjusting and fixing a longitudinal position of said joint to control a resilient force of said resilient means.

8 more elements

Dependencies are inferred from the claim text.