Seiko Epson Corporation

Kosho Kamijo

Naoto Takehana

Hirofumi Okubo

A projection optical apparatus is removably installed in a light emitting apparatus and projects light emitted from the light emitting apparatus. The projection optical apparatus includes a plurality of lenses, a lens barrel holding the plurality of lenses, and a first grip extending outward from the exterior of the lens barrel.

Projection optical apparatus that is removable installed in a light emitting apparatus and projector

A fixing device that fixes, to a light emitting device that emits light, a lens barrel included in a projection optical device and holding a plurality of lenses includes a first tube member, a contact section provided on an outer side of the first tube member and in contact with a holding section included in the light emitting device, and a pressing mechanism provided to be opposed to the contact section and configured to press the holding section toward the contact section when the fixing device is attached to the light emitting device.

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Yamagata-mura, Japan

Kosho Kamijo