Image display apparatus
First Claim
1. An image display apparatus comprising display means for displaying image information, and optical means for guiding light from the display means to the eye, wherein said optical means comprises a prism body of a positive refractive power having three or more surfaces with refractive powers differing depending upon azimuthal angles, and wherein a surface of the prism body closest to the display means is a surface in which refractive powers thereof differ depending upon azimuthal angles and in which a local curvature radius area having a positive refractive power on a local generating-line section (meridional section) is interposed between local curvature radius areas having a negative refractive power on the local generating-line section (meridional section).
2 Assignments
0 Petitions
Accused Products
Abstract
An image display apparatus has a display device for displaying image information and an optical system for guiding light from the display device to the eye. The optical system has a prism body of a positive refractive power including three or more surfaces with refractive powers differing depending upon azimuthal angles. The surface of the prism body closest to the display device is a surface in which refractive powers thereof differ depending upon azimuthal angles and in which a local curvature radius area having a positive refractive power on a local generating-line section (meridional section) is interposed between local curvature radius areas having a negative refractive power on the local generating-line section (meridional section).
-
Citations
11 Claims
- 1. An image display apparatus comprising display means for displaying image information, and optical means for guiding light from the display means to the eye, wherein said optical means comprises a prism body of a positive refractive power having three or more surfaces with refractive powers differing depending upon azimuthal angles, and wherein a surface of the prism body closest to the display means is a surface in which refractive powers thereof differ depending upon azimuthal angles and in which a local curvature radius area having a positive refractive power on a local generating-line section (meridional section) is interposed between local curvature radius areas having a negative refractive power on the local generating-line section (meridional section).
- 10. An image display apparatus comprising display means for displaying image information, optical means for guiding light from the display means to the eye, and seethrough means for guiding light from the outside to the eye, wherein said optical means comprises a prism body of a positive refractive power comprised of three or more different surfaces, inclusive of two or more surfaces with refractive powers differing depending upon azimuthal angles, wherein said seethrough means is constructed in such structure that a correction prism is placed adjacent to or joined to said prism body in said optical means, that adjacent surfaces or joint surfaces are partially transmitting surfaces with little optical refractive power, and that the eye optical axis is approximately aligned with the outside optical axis, wherein a surface of the seethrough means closest to the outside is a decentered, curved surface which has a shape different from that of a surface of the seethrough means closest to the eye and in which refractive powers differ depending upon azimuthal angles, and wherein the following condition is satisfied by a curvature radius l_ry on a local generating-line section (meridional section) and a curvature radius l_rx on a local sagittal section at a hit point between a reference ray and the decentered, curved surface of the seethrough means closest to the outside:
Specification