Rotation detection device and stylus pen
AssigneeAlps Alpine Co., Ltd.
InventorHiroshi Ohara
Life of this patent
Estimating the term…
Abstract
A rotation detection device includes an operation member having an annular shape and configured to be rotatable about a rotation center axis; a base member disposed within the operation member; a switch configured to be pressed as the operation member rotates and disposed on the base member such that a rotation direction of the operation member coincides with a pressing direction; and a returning mechanism configured to return the operation member to an initial position by an elastic force. The returning mechanism is provided within the operation member, and is located opposite to the switch with the rotation center axis interposed between the returning mechanism and the switch.
Claims10
A rotation detection device comprising:
- an operation member having an annular shape and configured to be rotatable about a rotation center axis;
- a base member disposed within the operation member;
- a switch configured to be pressed as the operation member rotates and disposed on the base member such that a rotation direction of the operation member coincides with a pressing direction;
- and
- a returning mechanism configured to return the operation member to an initial position by an elastic force,
- wherein the returning mechanism is provided within the operation member, and is located opposite to the switch with the rotation center axis interposed between the returning mechanism and the switch,
- wherein the switch includes a pair of switches,
- the operation member is rotatable in both directions about the rotation center axis, and
- the pair of switches are configured to detect rotation of the operation member in both directions.
A rotation detection device comprising:
- an operation member having an annular shape and configured to be rotatable about a rotation center axis;
- a base member disposed within the operation member;
- a switch configured to be pressed as the operation member rotates and disposed on the base member such that a rotation direction of the operation member coincides with a pressing direction;
- and
- a returning mechanism configured to return the operation member to an initial position by an elastic force,
- wherein the returning mechanism is provided within the operation member, and is located opposite to the switch with the rotation center axis interposed between the returning mechanism and the switch, wherein the returning mechanism includes
- a cam member disposed within the operation member and having a cam lobe axially oriented along the rotation center axis,
- an elastic member configured to preload the cam member in an axial direction of the rotation center axis, and
- a contact portion disposed within the operation member, integrated with the operation member, facing the cam lobe of the cam member, and configured to return the operation member to the initial position upon the cam lobe contacting the contact portion.
Dependencies are inferred from the claim text.