Patent ID: 11934036
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The imaging lens system according to claim 1,
wherein the second sub-group includes a positive lens component having positive power, a negative lens component, and a positive lens, which are disposed in that order from the object side to the image side, the positive lens component being a cemented lens made of a positive lens with a convex surface facing the object side and a negative lens, the negative lens component being one of a negative lens and a cemented lens,
wherein conditional expression (5) below is satisfied:

1.75<n12P  (5), where
n12P denotes a refractive index of material of the positive lens adjacent to the image side of the negative lens component closest to the object side.