| CPC G02B 13/003 (2013.01) [G02B 7/021 (2013.01); G02B 9/04 (2013.01)] | 28 Claims |
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1. An imaging lens system, comprising:
a lens barrel element; and
an imaging lens assembly, disposed on the lens barrel element, and the imaging lens assembly comprising, in order from an object side to an image side:
a first imaging lens element, having a first image-side contact surface;
a spacer element, having a second object-side contact surface and a second image-side contact surface, and the second object-side contact surface corresponding to the first image-side contact surface; and
a second imaging lens element, having a third object-side contact surface, and the third object-side contact surface corresponding to the second image-side contact surface;
wherein the second imaging lens element comprises a mark structure, the mark structure is an annular tapering protrusion, the mark structure surrounds an optical axis of the imaging lens system, and the mark structure is located closer to the optical axis than the third object-side contact surface to the optical axis;
wherein the lens barrel element and the spacer element together form a buffer structure located farther away from the optical axis than the first image-side contact surface to the optical axis, and the buffer structure comprises:
a first gap, wherein the first gap at least partially overlaps the third object-side contact surface in a direction parallel to the optical axis; and
a second gap, wherein a step difference is between the first gap and the second gap, and the second gap is located closer to the optical axis than the first gap to the optical axis;
wherein a width of the first gap is g1, a width of the second gap is g2, and the following condition is satisfied:
0.01≤g1/g2≤0.9.
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