Ocular optics system having at least four reflections occurring between curved surfaces

Inactive Publication Date: 2001-05-08
OLYMPUS OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In view of such problems associated with the prior art as mentioned above, an object of the present invention is to provide an ocular optical system designed to form no intermediate image

Problems solved by technology

A problem associated with an image display device of the type wherein an image thereof is relayed as shown in FIG. 6 is, however, that it needs not only an ocular optical system, but also a relay optical system, resulting in increases in the size and weight of the whole optical system as well as an increase in the amount of extension of the whole optical system from a person's head or face.
Therefore it is not fit for a head-mounted or face-mounted image display device.
The optical system for forming parallel beams as an intermediate image as well as the

Method used

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  • Ocular optics system having at least four reflections occurring between curved surfaces
  • Ocular optics system having at least four reflections occurring between curved surfaces
  • Ocular optics system having at least four reflections occurring between curved surfaces

Examples

Experimental program
Comparison scheme
Effect test

Example

Examples 1 to 3 of the image display device constructed using the ocular optics system according to the present invention will now be explained with reference to the accompanying drawings.

Constitutional parameters of each example will now be given later. In what follows, surface numbers are given by back-tracing surfaces numbers as counted from an observer's pupil position 1 toward an image display element 6. As shown in FIG. 1, a coordinate system is composed of the origin defined by an observer's iris position 1, a Z axis defined by an observer's visual axis 2, whose direction from the origin toward an ocular optical system 7 is taken as being positive, a Y axis perpendicular to the observer's visual axis 2, whose direction from below to above with respect to an observer's eyeball is taken as being positive, and an X axis perpendicular to the observer's visual axis 2, whose direction from right to left with respect to the observer's eyeball is taken as being positive. In other wor...

Example

FIGS. 1, 2 and 3 are sectional views of Examples 1, 2 and 3 of a monocular image display device. In these drawings, reference numeral 1 stands for an observer's pupil position, 7 an ocular optical system, 2 an observer's visual axis, 3 a first surface of the ocular optical system 7, 4 a second surface of the ocular optical system 7, 5 a third surface of the ocular optical system, and 6 an image display element.

Referring to actual optical paths in these examples, a pencil of light emanating from the image display element 6 is first incident on the ocular optical system 7 upon being refracted at the first surface 3 thereof, then is internally reflected at the second surface 4, the first surface 3, the second surface 4, the first surface 3 and the third surface 5 in the described order, then incident on the first surface 3 where it is refracted, and finally projected into an observer's eyeball while the iris position of the observer's pupil or the center of rotation of the observer's e...

Example

EXAMPLE 2

Sur- face Refractive Sur- sep- index face Radius of ar- (Displace- Abbe's No. No. curvature ation ment) (Tilt angle) 1 .infin. (pupil) 2 R.sub.y -152.846 1.51633 64.1 R.sub.x -66.891 Y -13.768 .theta. -13.449.degree. K.sub.y 0 Z 27.500 K.sub.x 0 AR -0.178178 .times. 10.sup.-8 BR -0.594362 .times. 10.sup.-11 AP 0.105146 .times. 10 BP 0.664504 3 R.sub.y -119.363 1.51633 64.1 R.sub.x -82.534 Y 47.793 .theta. 6.177.degree. K.sub.y 0 Z 54.768 K.sub.x 0 AR -0.190871 .times. 10.sup.-6 BR 0.305496 .times. 10.sup.-11 AP 0.660695 .times. 10.sup.-1 BP 0.487236 4 R.sub.y -152.846 1.51633 64.1 R.sub.x -66.891 Y -13.768 .theta. -13.419.degree. K.sub.y 0 Z 27.500 K.sub.x 0 AR -0.178178 .times. 10.sup.-8 BR -0.594362 .times. 10.sup.-11 AP 0.105146 .times. 10 BP 0.664504 5 R.sub.y -118.626 1.51633 64.1 R.sub.x -82.339 Y -26.271 .theta. -14.237.degree. K.sub.y 0 Z 40.718 K.sub.x 0 AR -0.122336 .times. 10.sup.-7 BR -0.514035 .times. 10.sup.-12 AP -0.236341 .times. 10 BP 0.831265 6 R.sub.y -15...

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Abstract

The invention relates to an ocular optics system which forms no intermediate image, is reduced in terms of size and weight with well-corrected aberrations, and is best suited for use on face- or head-mounted image display devices, and provides an ocular optics system 7 comprising three juxtaposed optical surfaces 3, 4 and 5, wherein a space defined by three optical surfaces 3, 4, and 5 is filled with a transparent medium having a refractive index greater than 1, at least two optical surfaces 3 and 4 of these three optical surfaces are defined by curved surfaces concave on a pupil position side of the optics system, and at least four reflections occur between curved surfaces 3 and 4.

Description

BACKGROUND OF THE INVENTIONThe present invention relates generally to an ocular optical system, and more particularly to an ocular optical system intended for use with a head- or face-mounted image display device which is mounted on the head or face of the user to project images into the user's eyeballs.In recent years, helmet or goggle-type of head-mounted or face-mounted image display devices have been developed for virtual reality purposes or with a view to allowing individuals to enjoy wide-screen viewing.For instance, JP-A-2-297516 discloses an optical system made up of a 2D display device 11 for displaying images, an objective collimating lens 12 and a parallel transparent plate 13 having off-axis paraboloidal mirrors on both its ends, as shown in FIG. 6. Light beams leaving the 2D display device 11 for displaying images are converted by the objective collimating lens 12 into parallel beams, which are then subjected to first transmission through a parallel surface of the paral...

Claims

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Application Information

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IPC IPC(8): G02B27/01G02B17/08G02B27/00G02B25/00G02B17/00G02B27/02
CPCG02B17/0848G02B17/086G02B27/0172G02B2027/011G02B2027/0178
Inventor TOGINO, TAKAYOSHI
Owner OLYMPUS OPTICAL CO LTD
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