Wide-field video display apparatus

Patent metadata

Field	Value
Publication number	US-12523875-B2
Application number	US-202018021975-A
Country	US
Kind code	B2
Filing date	Aug 21, 2020
Priority date	Aug 21, 2020
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A look-in type wide-field video display apparatus includes an ocular optical system (OC), a circular polarizing plate, and a display device (D) positioned in order from a user's eye side. The OC includes a first lens (L 1 ) and a second lens (L 2 ) positioned in order from the user's eye side, a surface on the user's eye side in the L 1 is aspherical, a surface on a D side in the L 1 is planar or approximately planar, and a reflective polarizing plate and a ¼-wavelength plate are laminated on the surface on the D side in this order from the user's eye side, a surface on the user's eye side in the L 2 is aspherical, and is convex toward the user's eye side around an optical axis of the OC or is approximately planar, and a surface on the D side in the L 2 is aspherical convex toward the D side.

First claim

What is claimed is:

1 . A look-in type wide-field video display apparatus, comprising:
an ocular optical system; a circular polarizing plate; and a display device positioned in order from a user's eye side, wherein the ocular optical system includes a first lens and a second lens positioned in order from the user's eye side, a first surface that is a surface on the user's eye side in the first lens is aspherical, a second surface that is a surface on a display device side in the first lens is planar or approximately planar, and a reflective polarizing plate and a ¼-wavelength plate are laminated on the second surface in this order from the user's eye side, a third surface that is a surface on the user's eye side in the second lens is aspherical, and is convex toward the user's eye side around an optical axis of the ocular optical system or is approximately planar around the optical axis, a fourth surface that is a surface on the display device side in the second lens is aspherical convex toward the display device side and is coated with a half mirror, and when power of the ocular optical system is represented as P0, power of the first lens is represented as P1, and power of the second lens with respect to video light traveling along a normal optical path after being emitted from the display device is represented as P2,
0.8 ×P 0 ≤P 2≤1.2 ×P 0, and

| P 1|<¼ ×P 2

are satisfied.

2 . The wide-field video display apparatus according to claim 1 , wherein
the circular polarizing plate is laminated on the display device or is positioned in a space between the ocular optical system and the display device.

3 . The wide-field video display apparatus according to claim 1 , wherein
when a maximum size of a video displayed on a video display surface of the display device is represented as DD, and an effective diameter of the second lens is represented as ED,
DD< 0.8× ED

is satisfied.

4 . The wide-field video display apparatus according to claim 1 , wherein
a refractive index Nd and an abbe number Vd of the second lens satisfy
Nd< 1.65, and
Vd> 50.

5 . The wide-field video display apparatus according to claim 4 , wherein
a material of the second lens is a resin material.

6 . The wide-field video display apparatus according to claim 1 , wherein
the power P0 (unit: 1/mm) of the ocular optical system satisfies
0.05< P 0<0.075.

7 . The wide-field video display apparatus according to claim 1 , wherein
when, assuming that a position of a pupil plane is a position of 12 mm toward the user's eye side from the first surface, a chief ray that travels at an inclination θ with respect to the optical axis after passing through the pupil plane is reversely traced from the pupil plane toward the first surface, the chief ray that first enters the third surface is inclined in a direction away from the optical axis toward a traveling direction, and the chief ray emitted from the fourth surface is inclined in a direction approaching the optical axis toward the traveling direction.

8 . The wide-field video display apparatus according to claim 7 , wherein
in a case where θ is 40°, when an incident angle of the chief ray that first enters the third surface with respect to the third surface is represented as θ3, and an exit angle of the chief ray that is emitted from the fourth surface with respect to the fourth surface is represented as θ4,
|θ3|>30°, and/or

|θ4|>30°

are satisfied.

9 . The wide-field video display apparatus according to claim 2 , wherein
when a maximum size of a video displayed on a video display surface of the display device is represented as DD, and an effective diameter of the second lens is represented as ED,
DD< 0.8× ED

is satisfied.

10 . The wide-field video display apparatus according to claim 2 , wherein
a refractive index Nd and an abbe number Vd of the second lens satisfy
Nd< 1.65, and
Vd> 50.

11 . The wide-field video display apparatus according to claim 2 , wherein
the power P0 (unit: 1/mm) of the ocular optical system satisfies
0.05< P 0<0.075.

12 . The wide-field video display apparatus according to claim 2 , wherein
when, assuming that a position of a pupil plane is a position of 12 mm toward the user's eye side from the first surface, a chief ray that travels at an inclination θ with respect to the optical axis after passing through the pupil plane is reversely traced from the pupil plane toward the first surface, the chief ray that first enters the third surface is inclined in a direction away from the optical axis toward a traveling direction, and the chief ray emitted from the fourth surface is inclined in a direction approaching the optical axis toward the traveling direction.

Assignees

• Kopin Corp

Inventors

• Iba Yoichi

Classifications

• G02B2027/0185

  Displaying image at variable distance · CPC title

• G02B2027/0123

  comprising devices increasing the field of view · CPC title

• G02B7/021

  for more than one lens · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B3/04 Primary

  with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses} · CPC title