Arrangement of λ/2 retardation plate in projector
AssigneeSeiko Epson Corporation
InventorTakeshi Takezawa
Life of this patent
Estimating the term…
Abstract
A projector is provided with an illuminating optical system, a color-separating optical system that separates light into first through third beams of colored light, first through third electro-optical devices that modulate the first through third beams of colored light to generate first through third beams of modulated light, a color combiner that combines the first through third beams of modulated light to create a composite light, and a projecting optical system that project the composite light. The projector further includes a λ/2 retardation plate provided on at least one of an incident side and an exit side of the third electro-optical device. Each of the λ/2 retardation plates has a first face open to the atmosphere and a second face in contact with a transmissive member.
Claims11
A projector for projecting and displaying a color image, comprising:
- an illuminating optical system that emits illuminating light;
- a color-separating optical system that separates said illuminating light emitted from said illuminating optical system into first through third beams of colored light, each of which has one of three color components;
- first through third electro-optical devices that modulate said first through third beams of colored light separated by said color-separating optical system according to image information to form first through third beams of modulated light;
- a color combiner that combines said first through third beams of modulated light to create a composite light by reflecting said first and third beams of modulated light while transmitting said second beam of modulated light;
- a projecting optical system that projects the composite light emitted from said color combiner;
- and
- a λ/2 retardation plate provided on at least one of an incident side and an exit side of said first electro-optical device and another λ/2 retardation plate provided on at least one of an incident side and an exit side of said third electro-optical device, each of said λ/2 retardation plates having a first surface open to the atmosphere and a second surface in contact with a transmissive member.
A projector for projecting and displaying a color image, comprising:
- an illuminating optical system that emits illuminating light;
- a color-separating optical system that separates said illuminating light emitted from said illuminating optical system into first through third beams of colored light, each of which has one of three color components;
- first through third electro-optical devices that modulate said first through third beams of colored light separated by said color-separating optical system according to image information to form first through third beams of modulated light;
- a color combiner that combines said first through third beams of modulated light to create a composite light by reflecting said first and third beams of modulated light while transmitting said second beam of modulated light;
- a projecting optical system that projects the composite light emitted from said color combiner;
- and
- a λ/2 retardation plate provided on at least one of an incident side and an exit side of said second electro-optical device, said λ/2 retardation plate having a first surface open to the atmosphere and a second surface in contact with a transmissive member, wherein said λ/2 retardation plate is affixed to one surface of said transmissive member, and said second electro-optical device includes a polarizing plate affixed to another surface of said transmissive member.
A projector for projecting and displaying a color image, comprising:
- an illuminating optical system that emits illuminating light;
- a color-separating optical system that separates said illuminating light emitted from said illuminating optical system into first through third beams of colored light, each of which has one of three color components;
- first through third electro-optical devices that modulate said first through third beams of colored light separated by said color-separating optical system according to image information to form first through third beams of modulated light;
- a color combiner that combines said first through third beams of modulated light to create composite light by reflecting said first and third beams of modulated light while transmitting said second beam of modulated light;
- a projecting optical system that projects the composite light emitted from said color combiner;
- and
- a λ/2 retardation plate provided on at least one of an incident side and an exit side of said second electro-optical device, said λ/2 retardation plate having a first surface open to the atmosphere and a second surface in contact with a transmissive member, wherein
- said λ/2 retardation plate is affixed to one surface of said transmissive member, and
- said second electro-optical device includes a polarizing plate affixed to a second transmissive member other than said transmissive member to which said λ/2 retardation plate is affixed.
Dependencies are inferred from the claim text.