VIRTUAL IMAGE DISPLAY APPARATUS

摘要

An optical system of a virtual image display apparatus is configured such that, in regard to a width in a first direction and a width in a second direction at a first surface position, and a width in a first direction and a width in a second direction at a second surface position corresponding to the width in the first direction and the width in the second direction at the first surface position, predetermined conditional expressions are established. With this, in an optical system for an HMD which includes a light guide member having a free-form surface, it is possible to allow video light to be emitted toward eyes in an appropriate state while controlling the light guide of video light accurately and maintaining high performance.

主权项

1. A virtual image display apparatus comprising:
a light guide member which includes two or more non-axisymmetric curved surfaces and is a part of an optical system, an intermediate image being formed inside the light guide member, wherein the light guide member comprises: a first surface; and a third surface arranged to face the first surface; and a video element that comprises a display screen and that generates video light that is totally reflected by the third surface, is totally reflected by the first surface, is reflected by a second surface, is transmitted through the first surface, and reaches an observation side, wherein for a total light beam flux which is emitted from the entire display screen of the video element and is within an effective range to reach a pupil arrangement position to be the position of a pupil of an eye of an observer, when, in a light beam flux cross-section of a region representing the range of the entire display screen of the video element, a surface position of the cross-section where a length in a first direction corresponding to a full width in a longitudinal direction becomes minimum is an A surface position, when, in a light beam flux cross-section of a region representing the range of the entire display screen of the video element, a surface position of the cross-section where a length in a second direction corresponding to a full width in a lateral direction is a B surface position, when, in the light beam flux cross-section at the A surface position, the width in the first direction is WAx and the width in the second direction is WAy, and when, in the light beam flux cross-section at the B surface position, the width in the first direction is WBx and the width in the second direction is WBy, the conditional expressions (1) and (2) are established:
WAx