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

Claim 11:
12. 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 second tube member provided on an outer side of a first tube member and capable of moving along a center axis of the first tube member;
a pressing section configured to come into contact with the holding section, the pressing section projects to the outer side from the second tube member;
an urging section configured to urge the pressing section to a contact section side, the urging section urges the second tube member to the contact section side.