Back to results
US 9,851,631 B2Granted
Light source optical system and projection display apparatus employing the same
AssigneeCanon Kabushiki Kaisha
InventorsKazuhiro Inoko, Takehito Kawasumi
Life of this patent
Estimating the term…
Abstract
A light source optical system includes a first fly-eye lens including a plurality of first lens cells, and a second fly-eye lens including a plurality of second lens cells that guide a light flux from the first fly-eye lens to a fluorescent member. A light source image is formed between the first fly-eye lens and the fluorescent member. When a short side direction of the second lens cells is defined as a first direction and a long side direction of the second lens cells is defined as a second direction, the width of the light source image in the second direction is wider than the width of the light source image in the first direction.
Claims16
A light source optical system configured to guide a light flux from a light source to a wavelength converting element, the light source optical system comprising:
- a first lens surface array including a plurality of first lens surfaces;
- and
- a second lens surface array including a plurality of second lens surfaces and configured to guide light fluxes from the first lens surface array to the wavelength converting element,
- wherein a light source image is formed between the first lens surface array and the wavelength converting element by the light flux transmitted through the plurality of first lens surfaces, and
- wherein, when a short side direction of the plurality of second lens surfaces is defined as a first direction and a long side direction of the plurality of second lens surfaces is defined as a second direction, a width of the light source image in the second direction is wider than a width of the light source image in the first direction.
2 more elements
A projection display apparatus comprising:
- a light source;
- a positive lens provided in a direction in which a light flux from the light source travels;
- a wavelength converting element;
- a light source optical system configured to guide a light flux from the light source to the wavelength converting element;
- a light modulating element;
- an illumination optical system configured to illuminate the light modulating element with a light flux from the light source optical system;
- and
- a color separating/combining system configured to guide the light flux from the light source optical system to the light modulating element and also configured to guide a light flux from the light modulating element to a projection optical system,
- wherein the light source optical system comprises
- a first lens surface array including a plurality of first lens surfaces;
- and
- a second lens surface array including a plurality of second lens surfaces and configured to guide a light flux from the first lens surface array to the wavelength converting element,
- wherein a light source image is formed between the first lens surface array and the wavelength converting element by the light flux transmitted through the plurality of first lens surfaces, and
- wherein, when a shorter side direction of the plurality of second lens surfaces is defined as a first direction and a longer side direction of the plurality of second lens surfaces as a second direction, a width of the light source image in the second direction is wider than a width of the light source image in the first direction.
11 more elements
A projection display apparatus comprising:
- a plurality of light source apparatuses,
- wherein each of the plurality of light source apparatuses comprises:
- a light source;
- a positive lens provided in a direction in which a light flux from the light source travels;
- a wavelength converting element configured to convert a light flux from the light source into converted light having a wavelength different from the light flux from the light source and also configured to guide the converted light in a direction different from a direction of the light source;
- a first lens surface array including a plurality of first lens surfaces and configured to divide a light flux from the positive lens into a plurality of light fluxes;
- a second lens surface array including a plurality of second lens surfaces and configured to guide a light flux from the first lens surface array to the wavelength converting element;
- a light guiding element configured to guide a light flux from the second lens surface array in a direction of the wavelength converting element and also configured to guide a light flux from the wavelength converting element in a direction different from a direction of the light source;
- and
- a condensing optical system configured to guide a light flux from the second lens surface array to the wavelength converting element,
- wherein a light source image is formed between the first lens surface array and the wavelength converting element by the light flux transmitted through the plurality of first lens surfaces, and
- wherein, when a short side direction of the plurality of second lens surfaces is defined as a first direction and a long side direction of the plurality of second lens surfaces as a second direction, a width of the light source image in the second direction is wider than a width of the light source image in the first direction, and
- in a plane parallel to a normal line of the light guiding element and an optical axis of the condensing optical system, a width of the second lens surface array in the first direction is narrower than a width of the first lens surface array in the first direction.
10 more elements
Dependencies are inferred from the claim text.