Imaging lens set and electronic device

An imaging lens set, comprising an annular optical element assembly and a plurality of lens elements, wherein the annular optical element assembly has a central axis, the lens elements and the annular optical element assembly are arranged along the central axis, and the annular optical element assembly comprises:

• a first annular optical element comprising:
• a first central opening, wherein the central axis passes through the first central opening;
• and
• a first axial connecting structure surrounding the first central opening, wherein the first axial connecting structure comprises a first axial connecting surface and a first outer receiving surface, the first axial connecting surface is a conical surface, the first outer receiving surface is vertical to the central axis, and the first outer receiving surface is farther from the central axis than the first axial connecting surface from the central axis;
• and
• a second annular optical element comprising:
• a second central opening, wherein the central axis passes through the second central opening;
• and
• a second axial connecting structure surrounding the second central opening, wherein the second axial connecting structure comprises a second axial connecting surface and a second outer receiving surface, the second axial connecting surface is a conical surface, the first axial connecting surface and the second axial connecting surface are corresponding and connected to each other for aligning the first annular optical element and the second annular optical element with the central axis, the second outer receiving surface is vertical to the central axis, the second outer receiving surface is farther from the central axis than the second axial connecting surface from the central axis, and the first outer receiving surface and the second outer receiving surface are corresponding and connected to each other;
• wherein on a cross-sectional plane of the annular optical element assembly which passes through the central axis and has a normal direction vertical to the central axis, a minimum diameter position of the first axial connecting surface is A1, a minimum diameter position of a surface forming the first central opening is H1, a minimum diameter position of the second axial connecting surface is A2, a minimum diameter position of a surface forming the second central opening is H2, only one of H1 and H2 is closer to an object side than both A1 and A2 to the object side, an angle between a line connecting A1 with H1 and a line connecting A2 with H2 is θ, and the following condition is satisfied:
• 5 degrees<θ<90 degrees;
• wherein a thickness of the first annular optical element which is parallel to the central axis and corresponding to the first outer receiving surface is t1, a thickness of the second annular optical element which is parallel to the central axis and corresponding to the second outer receiving surface is t2, and the following condition is satisfied:
• 0.2<t1/t2<5.0.