Microphone device

• US 9,407,983 B2
• Filed: 02/14/2013
• Issued: 08/02/2016
• Est. Priority Date: 02/21/2012
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Shiozawa, Yasuo, Goto, Kiyohiko, Tsutsui, Yoshiaki, Kumagai, Kunihiro, Esaki, Shuichi, Onitsuka, Hirofumi
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): KAUFMAN, JOSHUA A
• Application Number:
  US14/379,938
• Publication Number:
  US 20150373438A1
• Time in Patent Office: 1,265 Days
• US Class Current: 1/1
• CPC Class Codes: H04R 1/021 incorporating only one transducer
• CPC Class Codes: H04R 1/083 Special constructions of mouthpieces
• CPC Class Codes: H04R 1/222 for microphones H04R1/24, H04R1/26 take precedence
• CPC Class Codes: H04R 1/342 for microphones
• CPC Class Codes: H04R 29/004 for microphones H04R29/007 takes precedence

Abstract

A microphone device includes: a housing having an opening section in an upper face thereof; and a non-directional microphone unit incorporated in the housing and provided inside the opening section. The upper face of the housing has a shape in which a distance from an edge defined as a boundary between the upper face and a side face or a bottom face to the opening section throughout a whole circumference of the upper face changes in ½ or more of the whole circumference of the edge and an average value of the distance from the edge to the opening section is shorter than ½ of a wavelength of a sound wave in a frequency range in which an auditory sensitivity of humans is low.

Claims

1. A microphone device comprising:

a housing having an opening section in an upper face thereof and having a polygonal planar shape; and

a non-directional microphone unit incorporated in the housing and provided inside the opening section, wherein

the housing includes the upper face, a side face and a bottom face,

an edge is defined as a boundary between the upper face, and the side face or the bottom face,

the opening section is located at a center of a circumscribed circle of a planar shape of the upper face, and

the upper face of the housing has a shape in which an average value of a distance from the edge to the microphone unit throughout a whole circumference of the upper face is shorter than ½

of a wavelength of a sound wave of 10 kHz and in which a ratio of a longest distance to a shortest distance, from the edge to the microphone unit, is two or more in each side of the polygonal shape.

2. The microphone device according to claim 1, wherein the upper face of the housing has a convex shape with the opening section as an apex.