Head-mounted display apparatus

Patent metadata

Field	Value
Publication number	US-11067810-B2
Application number	US-201916666517-A
Country	US
Kind code	B2
Filing date	Oct 29, 2019
Priority date	Oct 30, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A head-mounted display apparatus according to an aspect of the present disclosure includes an imaging light generating device, a first deflection element including a first deflection section configured to deflect imaging light in a first direction and a second deflection section configured to deflect the imaging light in a second direction, a first diffraction element, and a second diffraction element. When a plane surrounded by the principal ray passing plane, the first principal ray, the second principal ray, and the first deflection section is taken as a first plane, and a plane surrounded by the second deflection section, the first principal ray, the second principal ray, and the first diffraction element is taken as a second plane, the first plane overlaps with at least a part of the second plane when viewed from the third direction and does not overlap with the second plane when viewed from the fourth direction.

First claim

What is claimed is:

1. A head-mounted display apparatus comprising:
an imaging light generating device;
a first deflection element including a first deflection section configured to deflect, in a first direction, imaging light emitted from the imaging light generating device and a second deflection section configured to deflect, in a second direction intersecting with the first direction, the imaging light deflected by the first deflection section;
a first diffraction element configured to diffract the imaging light deflected by the second deflection section; and
a second diffraction element configured to diffract the imaging light diffracted by the first diffraction element to form an exit pupil, wherein
when a principal ray of imaging light emitted from a center of a display region of the imaging light generating device and to be incident on the first deflection element is taken as a central principal ray,
the central principal ray coincides with a normal line of a virtual plane located between the imaging light generating device and the first deflection section, and when a direction that the first direction is projected on the virtual plane is taken as a third direction of the virtual plane and a direction orthogonal to the third direction is taken as a fourth direction,
a plane in the virtual plane through which the principal ray of imaging light emitted from an entire region of the display region passes is taken as a principal ray passing plane,
a principal ray configured to pass through a point at a center of the principal ray passing plane in the third direction and at a first end of the principal ray passing plane in the fourth direction is taken as a first principal ray and a principal ray configured to pass through a point at a center of the principal ray passing plane in the third direction and at a second end of the principal ray passing plane in the fourth direction is taken as a second principal ray,
a plane surrounded by the principal ray passing plane, the first principal ray, the second principal ray, and the first deflection section is taken as a first plane, and
a plane surrounded by the second deflection section, the first principal ray, the second principal ray, and the first diffraction element is taken as a second plane,
the first plane overlaps with at least a part of the second plane when viewed from the third direction and does not overlap with the second plane when viewed from the fourth direction.

2. The head-mounted display apparatus according to claim 1 , wherein
the first plane is non-parallel to the second plane when viewed from the fourth direction.

3. The head-mounted display apparatus according to claim 1 , further comprising:
a diaphragm between the imaging light generating device and the first deflection element on an optical path of the central principal ray, wherein
a position of the diaphragm on the optical path of the central principal ray and a position of the first diffraction element in the second direction coincide with each other.

4. The head-mounted display apparatus according to claim 1 , the head-mounted display apparatus further comprising:
a second deflection element configured to reflect, toward the second diffraction element, the imaging light diffracted by the first diffraction element and configured to transmit external light.

5. The head-mounted display apparatus according to claim 1 , wherein
the first diffraction element and the second diffraction element include a reflection-type volume hologram.

Assignees

• Seiko Epson Corp

Inventors

• Yonekubo Masatoshi
• Ide Mitsutaka

Classifications

• G02B2027/0174

  holographic · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G03H2223/24

  Reflector; Mirror · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/0112

  comprising device for genereting colour display · CPC title