Patent ID: 11940598
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. The lens system of claim 10, wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following condition is satisfied:

1.0 mm<TL<3.0 mm;

wherein an Abbe number of the first lens element is Vd1, an Abbe number of the second lens element is Vd2, an Abbe number of the third lens element is Vd3, an Abbe number of the fourth lens element is Vd4, an Abbe number of the i-th lens element is Vdi, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the i-th lens element is Ni, and at least one lens element of the lens system satisfies the following condition:

Vdi/Ni<13.5, wherein i=1, 2, 3 or 4.