Maxell, Ltd.

Minjoo Park

Takuya Shimizu

Kazuo Shikita

Hiroshi Nakamori

Akihiro Shiraishi

Chiaki Kinno

A projector generates white light from a laser light source and uses the white light for image display. The white light generator has a rectangular light generating lens that generates excitation light of a rectangular shape from the blue light of a blue laser and a phosphor wheel, coated with a phosphor that is irradiated with the excitation light, to emit yellow light. In the phosphor wheel, a length in the vertical direction of a rectangular shape of an irradiation region is represented by v, and a length in the horizontal direction is represented by h, wherein h&#x3c;v; and a center of the rectangular shape is within any one of a region having an angle of 45&#xb0; or more and 135&#xb0; or less and a region having an angle of 225&#xb0; or more and 315&#xb0; or less in the phosphor coat region of the phosphor wheel.

Projector including a phosphor wheel

The projector appropriately generates white light from a laser light source and uses the white light for image display. A white light generator that generates white light from blue light and yellow light includes a dichroic mirror that is irradiated with blue light from a blue laser, a first condenser lens that focuses the blue light that has passed through the dichroic mirror, a diffusion plate that diffuses the focused blue light, a second condenser lens that focuses the blue light obtained by allowing the diffused blue light to pass through the dichroic mirror, and a phosphor that is irradiated with the focused blue light to emit yellow light; the diffusion plate is an alumina ceramic plate; the dichroic mirror has a first region that transmits one of the blue light and the yellow light and reflects the other and a second region that reflects or transmits both.

Growing community of inventors

Oyamazaki, Japan

Minjoo Park