Optical lens, lens unit, imaging module, electronic apparatus, injection molding mold and injection molding method
The optical lens 10 having an optical function portion 12 having optical functions; and a flange portion 14 formed around the optical function portion 12 . The flange portion 14 has, on a side surface thereof, a cut section 42 which is formed by cutting a gate portion 16 . In a case where the following are viewed from the optical axis direction of the optical lens 10 , a thinnest portion 18 in a region 44 surrounded by lines L 1 and L 2 , which respectively connect both ends 42 a and 42 b of the cut section 42 to the optical axis center O of the optical lens 10 , and a line L 3 , which connects both ends 42 a and 42 b , is present in the optical function portion 12 . The flange portion 14 has a concave portion 40 outside the region 44.
1. An optical lens comprising:
an optical function portion that has an optical function;
a flange portion that is formed around the optical function portion; and
wherein the flange portion has a cut section, which is used for injection molding, on a first side surface thereof,
wherein the flange portion has a second side surface and a total planar area of the second side surface of the flange portion is S1;
wherein the optical lens has a thinnest portion in a triangular region, which is located in the optical function portion, having vertexes at a center of an optical axis of the optical lens and both ends of the cut section in a circumferential direction, and boundary portions extending between the vertexes,
wherein the second side surface of the flange portion has at least one concave portion formed along a circumferential direction, and the at least one concave portion does not extend around the entire circumference of the flange,
wherein the at least one concave portion is wholly provided outside the triangular region,
wherein if a thickness of the thinnest portion is T1, a thickness of the flange portion in the concave portion is T2, and
wherein a total area of the at least one concave portion on the second side surface of the flange portion is S2, and the following are satisfied
T 2/ T 1≤(8/3)×( S 2/ S 1)−0.2,
T 2/ T 1≥0.6, and
S 2/ S 1≤0.6.
2. The optical lens according to claim 1 , wherein a central angle, which is formed by two lines connecting the center of the optical axis and two respective end portions of the at least one concave portion disposed at a position where a central point of the cut section is interposed therebetween of the optical lens, is equal to or less than 60°.
3. The optical lens according to claim 1 , wherein a thickness of the flange portion in the at least one concave portion is equal to or less than 1.4 times a thickness of the thinnest portion.
4. The optical lens according to claim 1 , wherein the thickness of the flange portion in the at least one concave portion is equal to or less than 1.2 times the thickness of the thinnest portion.
5. The optical lens according to claim 1 , wherein the at least one concave portion has an inner peripheral surface that is oblique to a direction which is perpendicular to the surface on which the at least one concave portion is provided in the flange portion.
6. The optical lens according to claim 5 , wherein an angle of inclination a formed between the inner peripheral surface of the at least one concave portion and a direction, which is perpendicular to the surface on which the at least one concave portion is provided in the flange portion, satisfies 0<α≤15°.
7. The optical lens according to claim 1 , wherein a shape, which is viewed from the direction of the optical axis of the at least one concave portion on the surface on which the at least one concave portion is provided in the flange portion, has a curve shape at an end portion at least close to the cut section between end portions of the at least one concave portion in a circumferential direction of the flange portion.
8. The optical lens according to claim 1 ,
wherein the flange portion has a plurality of the concave portions, and
wherein the plurality of the concave portions are provided in the flange portion so as to be line-symmetric with respect to an axis passing through the center of the optical axis of the optical lens and the center of the cut section in the flange portion.
9. A lens unit comprising at least one optical lens according to claim 1 ,
wherein at least a part of a region other than the concave portions on surfaces having the concave portions of the flange portion of the optical lens is in contact with any of a different optical lens, a light blocking plate, a lens barrel, and a spacing ring.
10. An imaging module comprising:
the lens unit according to claim 9 ; and
an imaging element that captures an image of a subject through the optical lens of the lens unit.
11. The imaging module according to claim 10 , wherein a pixel pitch of the imaging element is equal to or less than 1 μm.
12. An electronic apparatus comprising the imaging module according to claim 10 .