Wavelength converting member and projector including the wavelength converting member

摘要

A wavelength converting member includes at least a first, second, and third regions, circumferentially on a disc-shaped light-transmissive substrate. The first region includes, from a light incident direction, a first and second phosphor layers. The first phosphor layer includes a first phosphor to absorb at least part of incident light and to emit a first light having a wavelength different from the incident light. The first phosphor layer defines an indentation in a surface on the second phosphor layer side, with a depth a half or more of the thickness of a portion of the first phosphor layer absent of the indentation. The second phosphor layer includes a second phosphor to absorb at least part of the first light emitted by the first phosphor and to emit a second light having a wavelength different from the first light, and is disposed in the indentation of the first phosphor layer.

主权项

1. A wavelength converting member, comprising:
at least a first region, a second region, and a third region, which are disposed on a disc-shaped light-transmissive substrate in a circumferential direction, wherein the first region includes a first phosphor layer and a second phosphor layer on the light-transmissive substrate, in order, from a light incident direction, wherein the first phosphor layer comprises a first phosphor configured to absorb at least a portion of incident light and to emit a first light having a wavelength different from the incident light, the first phosphor layer defining an indentation in a surface on a second phosphor layer side, with a depth a half or more of a thickness of a portion of the first phosphor layer absent of the indentation, wherein the second phosphor layer comprises a second phosphor configured to absorb at least a portion of the first light emitted by the first phosphor and to emit a second light having a wavelength different from the first light, wherein the second phosphor layer comprising the second phosphor is disposed in the indentation of the first phosphor layer, wherein the second region comprises a third phosphor layer including a third phosphor configured to absorb at least a portion of incident light and to emit a third light having a wavelength different from the incident light, and wherein the third region comprises a region absent of a phosphor.