公开(公告)号：US10324296B2

公开(公告)日：2019-06-18

申请号：US15872258

申请日：2018-01-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroshi Mitani ,  Katsuo Saigou ,  Kenya Uomori

IPC: G02B27/01

Abstract: A display device displays video for a virtual image. The display device includes a video generation unit generates image light representing the video, a concave mirror has a reflective surface on which the image light is reflected, and a support mechanism adjusts a position of the concave mirror. The concave mirror has, in each position on the reflective surface, a first radius of curvature in the first direction and a second radius of curvature in a second direction. The first radius of curvature and the second radius of curvature individually change and have different rates of change. The reflective surface has a shape following a partial region on an outer surface of an ellipsoid. The ellipsoid has a radius along the first direction that is greater than a radius along the second direction and a radius along a third direction orthogonal to the first direction and the second direction.

公开(公告)号：US11265637B2

公开(公告)日：2022-03-01

申请号：US17183236

申请日：2021-02-23

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Hiroshi Kunimoto ,  Suguru Nakao ,  Kei Tasaka ,  Katsuo Saigou

IPC: H04R1/10 ,  H01R13/70 ,  H04R17/02

Abstract: A bone conduction microphone includes a housing having an opening, a microphone pad, an element support member, a piezoelectric element, and a drive plate. The microphone pad is formed in a bottomed tubular shape having a bottom portion disposed outward and a tubular portion with an outer circumference fixed to an inner circumference of the opening. The element support member has an outer circumference fixed to an inner circumference of the tubular portion, and a support portion projecting toward the bottom portion. The piezoelectric element is in a plate shape with a peripheral edge of one surface fixed to the support portion and picks up vibration. The drive plate has a diaphragm part fixed to an inward surface of the bottom portion, and the diaphragm part is provided at a center with a protrusion fixed to an element central portion on another surface of the piezoelectric element.