Image display device, ocular optical system, and method of manufacturing ocular optical system

An ocular optical system that includes a polarization element and guides light from an image display element toward an eyeball of an observer, and is used in an image display device, the ocular optical system comprising:

• at least one optical element having a forming gate mark in a part of an outer periphery,
• wherein the forming gate mark is disposed in a direction of an apex of an image display region of the image display element with respect to a point on an optical axis of the ocular optical system in a cross section perpendicular to the optical axis of the ocular optical system.

A method of manufacturing an ocular optical system that guides light from an image display element toward an eyeball of an observer via an optical element and a polarization element, the method comprising:

• forming a forming gate mark in a part of an outer periphery of the optical element by causing a resin to flow in a die;
• and
• assembling the optical element so that the forming gate mark or a distorted region occurring near the forming gate mark is disposed in a direction of an apex of an image display region of the image display element with respect to a point on an optical axis of the ocular optical system in a cross section perpendicular to the optical axis.

A method of manufacturing an ocular optical system that includes a polarization element and guides light from an image display element to an eyeball of an observer, the method comprising:

• mold-forming one optical element included in the ocular optical system by causing a material to flow from a gate of a mold;
• and
• assembling the optical element so that a gate mark of the optical element that remains in the mold-forming matches a direction of an apex of an image display region of the image display element with respect to a point on an optical axis of the ocular optical system in a cross section perpendicular to the optical axis.