Imaging lens system, image capturing unit and electronic device

An imaging lens system, having an optical axis, and the imaging lens system comprising:

• a plurality of optical elements, arranged along the optical axis, wherein the plurality of optical elements at least comprise a first optical element and a second optical element;
• a lens barrel, surrounding the optical axis, wherein the plurality of optical elements are accommodated in the lens barrel;
• an optical mark structure, disposed on the first optical element, wherein the optical mark structure faces the second optical element, the optical mark structure comprises a plurality of optical mark units arranged side by side along a circumference direction that surrounds the optical axis, and each of the plurality of optical mark units comprises a first optical mark surface and a second optical mark surface, and the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units are arranged side by side;
• and
• a curable liquid, disposed on the optical mark structure, wherein the curable liquid is in physical contact with at least one of the plurality of optical mark units, and the first optical element is fixed to the second optical element while the curable liquid is cured;
• wherein a projection area of each of the first optical mark surfaces on a reference surface perpendicular to the optical axis is A, a distance along the circumference direction between center points of two of the first optical mark surfaces adjacent in the circumference direction is D, an angle between an observation direction and the optical mark structure is θ, a gloss value difference in the observation direction between the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units is ΔG, and the following conditions are satisfied:
• 0.001 [mm2]≤A≤0.072 [mm2];
• 0.03 [mm]≤D≤1.0 [mm];
• 50 [deg.]≤θ≤90 [deg.];
• and
• 15 [GU]≤ΔG≤50 [GU].