Patent ID: 11892660
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A reflecting element comprising:
a first reflecting film to reflect light; and
a second reflecting film to increase a reflectivity of the first reflecting film,
the second reflecting film including at least one layer of high-refractive-index material and a plurality of layers of low-refractive-index material with a refractive index lower than that of the at least one layer of high-refractive-index material,
wherein one of the plurality of layers of low-refractive-index material being a top layer of the second reflecting film has a thickness of 20 nm or less and a refractive index of lower than 1.65, and
a thickness of each of the at least one layer of high-refractive-index material and the plurality layers of low-refractive-index material except the top layer of the second reflecting film is larger than a thickness of the first reflecting film.