Patent ID: 6124977
Filing Date: 2000-09-26
Classification: G02B

Abstract:
An image display apparatus, comprising:an image display device and an ocular optical system that leads an image formed by said image display device so that said image is observed as a virtual image,wherein said ocular optical system comprises a prism member formed from a medium having a refractive index (n) larger than 1 (n>1),said prism member comprising:a first surface having an action through which a light beam enters said prism member;a second surface having an action by which the light beam is reflected in said prism member; anda third surface having an action through which the light beam exits from said prism member,wherein an antireflection member having a flare- or ghost-preventing action is provided over a part of a non-effective reflecting area of at least said second surface, exclusive of an effective reflecting area, said effective reflecting area being an area reflecting an effective light beam that forms said virtual image, andwherein the effective reflecting area of said second surface is formed from a mirror reflecting surface provided with a reflective mirror coating, and said antireflection member is provided over a part of a non-effective reflecting area of at least said second surface on a side of said mirror reflecting surface closer to said image display device.