Keyboard device and method for detecting key press information

JP7880972B2Active Publication Date: 2026-06-26ROLAND CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
ROLAND CORP
Filing Date
2022-08-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Conventional keyboard devices using non-contact sensors for detecting key press information face issues of increased weight and cost due to thick metal plates, leading to unstable magnetic flux concentration and inaccurate detection.

Method used

A keyboard device design featuring a coil, displacement member, and conductor configuration that includes a facing portion and front portion on the conductor, which disperses magnetic flux to stabilize sensor output while reducing weight and cost.

Benefits of technology

Accurate detection of key press information is achieved with reduced weight and cost by dispersing magnetic flux, enhancing sensor stability and reducing dimensional and mounting errors.

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Abstract

A front surface 73 of a displacement member 7 is covered by a front surface portion 81 which is bent from a facing portion 80 of a part 8 to be detected. It is thus possible to ensure a large vertical width of the front surface portion 81 even when the thickness of the part 8 to be detected is thin. Since it is possible to disperse the concentration of lines of magnetic force by ensuring the large vertical width of the front surface portion 81, it is possible to reduce overshoot of a sensor output. That is, it is possible to reduce the overshoot of the sensor output without using a metal plate which has a large thickness such as that of a conventional one. Therefore, key press information can be accurately detected while also suppressing an increase in weight and an increase in cost of the keyboard device 1.
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