Patent ID: 11921407
Assignee: SEIKO EPSON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. A projection optical device detachably attached to a light emitting device that emits light, the projection optical device comprising:
a plurality of lenses;
a lens barrel holding the plurality of lenses;
a contact section 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 projection optical device is attached to the light emitting device; wherein the pressing mechanism includes:
a pressing section configured to come into contact with the holding section, the pressing section includes:
a pressing surface provided in a position opposed to the contact section and configured to press the holding section;
a guide surface adjacent to the pressing surface in a circumferential direction centering on a center axis of a first tube member and provided continuously to the pressing surface and configured to guide the holding section to the pressing surface, and
the guide surface is inclined with respect to the circumferential direction to further separate from the contact section as being further apart from the pressing surface; and

an urging section configured to urge the pressing section to a contact section side.