OPTICAL MODULE
An optical module is provided. The optical module includes a resin package, a lens and a light emitting element. The resin package has a receiving groove. The lens is disposed on the resin package, and the lens includes a light emitting surface, a light entering surface, and a central axis, wherein the light entering surface has an asymmetric structure. The light emitting element is disposed in the receiving groove, wherein the light emitting element is disposed deviated from the central axis of the lens.
1 . An optical module, comprising:
a resin package, having a receiving groove;
a lens, disposed on the resin package, wherein the lens comprises a light emitting surface, a light entering surface and a central axis, wherein the light entering surface has an asymmetric structure; and
a light emitting element, disposed in the receiving groove, wherein the light emitting element is disposed deviated from the central axis of the lens.
2 . The optical module as claimed in claim 1 , wherein the asymmetric structure comprises a first region, a second region, a third region, and a fourth region.
3 . The optical module as claimed in claim 1 , wherein in a top perspective view, the asymmetric structure is symmetric in a second direction and asymmetric in a first direction.
4 . The optical module as claimed in claim 2 , wherein in a top perspective view, in the first region, the width of the asymmetric structure in the second direction gradually increases along the first direction; in the second region, the width of the asymmetric structure in the second direction is substantially uniform along the first direction; in the third region, the width of the asymmetric structure in the second direction is substantially uniform along the first direction; in the fourth region, the width of the asymmetric structure in the second direction gradually decreases along the first direction.
5 . The optical module as claimed in claim 2 , wherein in a cross-sectional view, in the first region, the asymmetric structure has a first curvature; in the second region, the asymmetric structure has a second curvature; in the third region, the asymmetric structure has a third curvature; and in the fourth region, the asymmetric structure has a fourth curvature.
6 . The optical module as claimed in claim 5 , wherein in the cross-sectional view, in the first region, the asymmetric structure is a convex surface; in the second region, the asymmetric structure is a convex surface; in the third region, the asymmetric structure is a concave surface; in the fourth region, the asymmetric structure is a concave surface.
7 . The optical module as claimed in claim 1 , wherein in a cross-sectional view, along the first direction, a protrusion height of the asymmetric structure of the light entering surface in a third direction is non-uniform.
8 . The optical module as claimed in claim 5 , wherein in the cross-sectional view, along the first direction, in the first region, the protrusion height of the asymmetric structure in the third direction gradually increases; in the middle position of the second region, the protrusion height of the asymmetric structure in the third direction reaches the maximum height of the asymmetric structure; in the third region, the protrusion height of the asymmetric structure in the third direction gradually decreases.
9 . The optical module as claimed in claim 1 , wherein in a cross-sectional view, the asymmetric structure is a convex structure that is similar to a slide shape.
10 . The optical module as claimed in claim 8 , wherein in the cross-sectional view, a highest point of the asymmetric structure does not overlap with the central axis of the lens.