Actuator, pressing device and keyboard instrument

Patent metadata

Field	Value
Publication number	US-10891929-B2
Application number	US-201816494868-A
Country	US
Kind code	B2
Filing date	Mar 15, 2018
Priority date	Mar 24, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A relationship of 0<α 1 <2θ 1 is satisfied, where α 1 is an angle formed between a first line which is vertical to a parallel line passing through a pivot center point and being parallel to a pivot extending direction, passes through a center point of a first portion from the center point of the first portion toward the parallel line, and a second line which is vertical, at the center point of the first portion, to a first portion extending direction, passes through the center point of the first portion toward a vertical line being vertical to the parallel line and passing through the pivot center point, and where θ 1 is an angle formed between the first line and a third line connecting the pivot center point and the center point of the first portion from the center point of the first portion toward the pivot center point.

First claim

What is claimed is:

1. An actuator, comprising:
a pivot; and
a ridged surface on which a ridge part is formed and disposed, wherein
in a plan view of the ridged surface, the ridge part has a first portion configured to satisfy a relationship of 0<α 1 <2θ 1 , where α 1 is an angle formed between a first line and a second line,
the first line is vertical to a parallel line that passes through a center point of the pivot,
the first line is parallel to a direction in which the pivot extends,
the first line passes through a center point of the first portion,
the second line is vertical, at the center point of the first portion, to a direction in which the first portion extends,
the second line passes through the center point of the first portion, and
where θ1 is an angle formed between the first line and a third line which connects the center point of the pivot and the center point of the first portion.

2. The actuator according to claim 1 , wherein the angle α 1 is smaller than 90°.

3. The actuator according to claim 1 , wherein
the ridge part further has a second portion,
the second portion is configured to satisfy a relationship of α 1 <α 2 , where α 2 is an angle formed between a fourth line and a fifth line,
the fourth line is vertical to the parallel line, passes through a center point of the second portion,
the fourth line extends from the center point of the second portion toward the parallel line,
the fifth line which is vertical to a direction in the second portion extends, and
the fifth line passes through the center point of the second portion and extends toward the parallel line or a vertical line vertical to the direction in which pivot extends.

4. The actuator according to claim 1 , wherein the ridge part is disposed in an arc shape with respect to the center point of the pivot.

5. The actuator according to claim 4 , wherein
at least one additional ridge part is formed on the ridged surface so that a plurality of ridge parts is arranged on the ridged surface,
a first ridge part which is one of the plurality of ridge parts is disposed closer to the pivot than a second ridge part of the plurality of ridge parts, and
the first ridge part has a radius of curvature smaller than that of the second ridge part.

6. A pressing device, comprising:
the actuator according to claim 1 and a movable member to be pressed by the actuator, wherein an elastic material is used in the movable member.

7. The pressing device according to claim 6 , further includes a reaction-force generating device.

8. The pressing device according to claim 6 , further includes a switching device.

9. A keyboard instrument, comprising:
the pressing device according to claim 6 , wherein the actuator includes a hammer.

10. A keyboard instrument, comprising:
the pressing device according to claim 6 , wherein the actuator includes a key.

11. A keyboard instrument, comprising:
the pressing device according to claim 6 , wherein the actuator includes an interlock member that is interlocked with a key or a hammer.

Assignees

• Yamaha Corp

Inventors

• Yamamoto Shin

Classifications

• G10C3/18

  Hammers · CPC title

• G10H2220/285

  with three contacts, switches or sensor triggering levels along the key kinematic path · CPC title

• G10H1/053

  during execution only {(voice controlled instruments G10H5/005)} · CPC title

• G10B3/12

  Keys or keyboards; Manuals · CPC title

• G10H1/18

  Selecting circuits · CPC title