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US 9,039,215 B2Granted
Light source device and projection type display device
AssigneeNEC Corporation
InventorMasahiko Ohta
Life of this patent
Estimating the term…
Abstract
A light source device includes a light source unit concluding LD element (1) for emitting a laser beam polarized in a particular direction and lens (2) for condensing the laser beam emitted from LD element (1) and phosphor layer (3) excited by the laser beam condensed by lens (2) of the light source unit to discharge incoherent light. The incident angle of the laser beam to phosphor layer (3) is larger than 0° and smaller than 90°, and the laser beam enters phosphor layer (3) as P-polarized light.
Claims14
A light source device comprising:
- a light source unit including a laser diode emitting a laser beam polarized in a particular direction and a light collection optical system condensing the laser beam emitted from the laser diode;
- and
- a phosphor layer excited by the laser beam condensed by the light collection optical system of the light source unit, the phosphor layer emitting incoherent light,
- wherein the laser diode and the phosphor layer are arranged such that an incident angle, which is an angle formed between an optical axis of the laser beam and a normal line of the phosphor layer, is larger than 0° and smaller than 90° and such that the laser beam enters the phosphor layer as P-polarized light.
1 more element
A light source device comprising:
- a light source unit including a laser diode emitting a laser beam polarized in a particular direction, a polarization conversion element rotating a polarizing direction of the laser beam emitted from the laser diode, and a light collection optical system condensing the laser beam rotated in the polarizing direction by the polarization conversion element;
- and
- a phosphor layer excited by the laser beam condensed by the light collection optical system of the light source unit, the phosphor layer emitting incoherent light, wherein:
- an incident angle of the laser beam to the phosphor layer is larger than 0° and smaller than 90°;
- and
- the laser beam enters the phosphor layer as P-polarized light.
3 more elements
Dependencies are inferred from the claim text.