Image display apparatus

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;
• and
• a 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, and
• wherein 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 remote from said image display device.

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;
• and
• a 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, and
• wherein an identical surface serves as both said first surface and said third surface.

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;
• and
• a third surface having an action through which the light beam exits from said prism member,
• wherein a light-blocking member having a flare- or ghost-preventing action is provided over a part of a non-effective transmitting area of at least said first surface, exclusive of an effective transmitting area, said effective transmitting area being an area transmitting an effective light beam that forms said virtual image, and
• wherein said first surface is placed to face opposite to said image display device, and said light-blocking member is formed from a light-blocking wall extending from said first surface toward said image display device between the effective transmitting area and non-effective transmitting area of said first surface.

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;
• and
• a third surface having an action through which the light beam exits from said prism member,
• wherein a light-blocking member having a flare- or ghost-preventing action is provided over a part of a non-effective transmitting area of at least said first surface, exclusive of an effective transmitting area, said effective transmitting area being an area transmitting an effective light beam that forms said virtual image, and
• wherein said light-blocking member is provided over at least a part of said non-effective transmitting area of said first surface on each of left and right sides of said effective transmitting area.

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;
• and
• a third surface having an action through which the light beam exits from said prism member,
• wherein a light-blocking member having a flare- or ghost-preventing action is provided over a part of a non-effective transmitting area of at least said first surface, exclusive of an effective transmitting area, said effective transmitting area being an area transmitting an effective light beam that forms said virtual image, and
• wherein said light-blocking member is provided over a whole of said non-effective transmitting area of said first surface.

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;
• and
• a third surface having an action through which the light beam exits from said prism member,
• wherein a light-blocking member having a flare- or ghost-preventing action is provided over a part of a non-effective transmitting area of at least said first surface, exclusive of an effective transmitting area, said effective transmitting area being an area transmitting an effective light beam that forms said virtual image, and
• wherein an identical surface serves as both said first surface and said third surface.