Phosphor disc, phosphor wheel, light source device, projection display apparatus, and manufacturing method of phosphor disc

1. A phosphor disc comprising:

a disc-shaped metal plate;

a phosphor layer disposed circumferentially on the metal plate; and

a bonding layer for bonding the phosphor layer to the metal plate,

wherein the metal plate curves convexly toward the phosphor layer.

2. The phosphor disc according to claim 1 , wherein the metal plate is an aluminum plate, the phosphor layer is made of inorganic phosphor, and the bonding layer is made of a mixture of resin bonding agent and titanium oxide.

3. A phosphor wheel comprising:

the phosphor disc as defined in claim 1 ; and

a motor mounted to the phosphor disc for driving the phosphor disc.

4. A light source device comprising:

an excitation light source;

a light guide optical system for guiding outgoing light from the excitation light source; and

the phosphor wheel as defined in claim 3 ,

wherein an irradiation of the phosphor layer of the phosphor wheel with the outgoing light from the light guide optical system prompts the phosphor layer to emit fluorescent light.

5. A projection display apparatus comprising the light source device as defined in claim 4 .

6. A method for manufacturing a phosphor disc, the method comprising:

a step of disposing a disc-shaped metal plate, having a first face covered with a thermosetting bonding layer formed circumferentially, on a base such that a second face of the disc-shaped metal plate is brought into contact with a mounting face of the base for a phosphor layer to be located on the bonding layer;

a step of bonding the phosphor layer and the metal plate together by placing a weight on the phosphor layer; and

a step of curing the bonding layer with heat following a removal of the weight after the phosphor layer and the metal plate are bonded together, and leaving, for a given time, the metal plate bonded with the phosphor layer at a temperature to be employed during an actual use,

wherein after the step of curing, the metal plate bonded with the phosphor layer curves convexly toward the first face at a room temperature due to a difference in linear expansion coefficients between the phosphor layer and the metal plate.

7. A method for manufacturing a phosphor disc, the method comprising:

a step of disposing a phosphor layer on a base such that a first face of the phosphor layer is brought into contact to a mounting face of the base, and disposing a metal plate having one side covered with a thermosetting bonding layer such that the bonding layer is brought into contact to a second face of the phosphor layer;

a step of bonding the phosphor layer and the metal plate together by placing a weight on the metal plate; and

a step of curing the bonding layer with heat following a removal of the weight after the phosphor layer and the metal plate are bonded together, and leaving, for a given time, the metal plate bonded with the phosphor layer at a temperature to be employed during an actual use,

wherein after the step of curing, the metal plate bonded with the phosphor layer curves convexly toward the first face at a room temperature due to a difference in linear expansion coefficients between the phosphor layer and the metal plate.