Plastic lens element, optical imaging module and electronic device

1 . A plastic lens element, having a section passing through an optical axis, and the plastic lens element comprising:

an optical effective region, the optical axis passing through the optical effective region; and

a peripheral region circularly disposed on a periphery of the optical effective region, and the peripheral region having an outer diameter surface and an annular lateral surface, wherein the outer diameter surface is farther away from the optical effective region than the annular lateral surface from the optical effective region, the annular lateral surface is located between the outer diameter surface and the optical effective region, and the peripheral region comprises:

a protrusive structure disposed on the outer diameter surface and adjacent to the annular lateral surface, and the protrusive structure extending towards a direction away from the optical axis;

an indented shape dented from the outer diameter surface towards the optical effective region, and the indented shape having a base surface; and

a drafting part raised from the base surface towards the direction away from the optical axis, and the drafting part having a top surface and a bottom surface via the section, wherein the top surface and the bottom surface are arranged along an extending direction parallel to the optical axis, a conical surface is located between the top surface and the bottom surface, the conical surface is tapered from the top surface towards the optical axis in a direction towards the bottom surface, and the top surface, the conical surface, the bottom surface and the protrusive structure are arranged in order along a direction parallel to the optical axis.

2 . The plastic lens element of claim 1 , wherein the indented shape comprises a gate.

3 . The plastic lens element of claim 1 , wherein a first step valley is formed between the conical surface and the bottom surface, the first step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

4 . The plastic lens element of claim 3 , wherein the conical surface comprises a first step surface, a second step surface and a third step surface, the first step surface, the second step surface and the third step surface are arranged in order along the optical axis, the first step surface is located between the top surface and the second step surface, the second step surface is located between the first step surface and the third step surface, and the third step surface is located between the bottom surface and the second step surface;

wherein a second step valley is formed between the first step surface and the second step surface, the second step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

5 . The plastic lens element of claim 1 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9.1

<

L

/

CT

<

4

⁢

0

.

6 . The plastic lens element of claim 2 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9

.1

<

L

/

CT

<

4

⁢

0

.

7 . The plastic lens element of claim 1 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

8 . The plastic lens element of claim 2 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

9 . An optical imaging module, having the optical axis, and comprising:

a plurality of lens elements, at least one of the lens elements being the plastic lens element of claim 1 .

10 . An electronic device, comprising:

the optical imaging module of claim 9 .

11 . A plastic lens element, having a section passing through an optical axis, and the plastic lens element comprising:

an optical effective region, the optical axis passing through the optical effective region; and

a peripheral region circularly disposed on a periphery of the optical effective region, and the peripheral region having an outer diameter surface and an annular lateral surface, wherein the outer diameter surface is farther away from the optical effective region than the annular lateral surface from the optical effective region, the annular lateral surface is located between the outer diameter surface and the optical effective region, and the peripheral region comprises:

a protrusive structure disposed on the outer diameter surface and adjacent to the annular lateral surface, and the protrusive structure extending towards a direction away from the optical axis;

an indented shape dented from the outer diameter surface towards the optical effective region, and the indented shape having a base surface; and

a release notch dented from the base surface towards the optical axis, and the release notch having a top surface and a bottom surface via the section, wherein the top surface and the bottom surface are arranged along an extending direction of the optical axis, a conical surface is located between the top surface and the bottom surface, the conical surface is tapered from the top surface towards the optical axis in a direction towards the bottom surface, and the top surface, the conical surface, the bottom surface and the protrusive structure are arranged in order along a direction parallel to the optical axis.

12 . The plastic lens element of claim 11 , wherein the indented shape comprises a gate.

13 . The plastic lens element of claim 11 , wherein a first step valley is formed between the conical surface and the bottom surface, the first step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

14 . The plastic lens element of claim 13 , wherein the conical surface comprises a first step surface, a second step surface and a third step surface, the first step surface, the second step surface and the third step surface are arranged in order along the optical axis, the first step surface is located between the top surface and the second step surface, the second step surface is located between the first step surface and the third step surface, and the third step surface is located between the bottom surface and the second step surface;

wherein a second step valley is formed between the first step surface and the second step surface, the second step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

15 . The plastic lens element of claim 11 , wherein the indented shape comprises two drafting parts protruding from the base surface towards a direction away from the optical axis, and a gap is located between the two drafting parts to form the release notch.

16 . The plastic lens element of claim 11 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9.1

<

L

/

CT

<

4

⁢

0

.

17 . The plastic lens element of claim 12 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9.1

<

L

/

CT

<

4

⁢

0

.

18 . The plastic lens element of claim 11 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

19 . The plastic lens element of claim 12 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

20 . An optical imaging module, having the optical axis, and comprising:

a plurality of lens elements, at least one of the lens elements being the plastic lens element of claim 11 .

21 . An electronic device, comprising:

the optical imaging module of claim 20 .

22 . A plastic lens element, having a section passing through an optical axis, and the plastic lens element comprising:

an optical effective region, the optical axis passing through the optical effective region; and

a peripheral region circularly disposed on a periphery of the optical effective region, and the peripheral region having an outer diameter surface and an annular lateral surface, wherein the outer diameter surface is farther away from the optical effective region than the annular lateral surface from the optical effective region, the annular lateral surface is located between the outer diameter surface and the optical effective region, and the peripheral region comprises:

an indented shape dented from the outer diameter surface towards the optical effective region, and the indented shape having a base surface;

a release notch dented from the base surface towards the optical axis, and the release notch having a top surface and a bottom surface via the section, wherein the top surface and the bottom surface are arranged along an extending direction of the optical axis, a conical surface is located between the top surface and the bottom surface, and the conical surface is tapered from the top surface towards the optical axis in a direction towards the bottom surface; and

an air gap formed on the indented shape via the conical surface and the bottom surface, so that an overlap between the air gap and the indented shape being in extending directions parallel to the optical axis towards both an object side and an image side.

23 . The plastic lens element of claim 22 , wherein the indented shape comprises a gate.

24 . The plastic lens element of claim 22 , wherein a first step valley is formed between the conical surface and the bottom surface, the first step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

25 . The plastic lens element of claim 24 , wherein the conical surface comprises a first step surface, a second step surface and a third step surface, the first step surface, the second step surface and the third step surface are arranged in order along the optical axis, the first step surface is located between the top surface and the second step surface, the second step surface is located between the first step surface and the third step surface, and the third step surface is located between the bottom surface and the second step surface;

wherein a second step valley is formed between the first step surface and the second step surface, the second step valley has an obtuse angle, and an angle range of the obtuse angle is between 160 degrees and 179.5 degrees.

26 . The plastic lens element of claim 22 , wherein the indented shape comprises two drafting parts protruding from the base surface towards a direction away from the optical axis, and a gap is located between the two drafting parts to form the release notch.

27 . The plastic lens element of claim 22 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9.1

<

L

/

CT

<

4

⁢

0

.

28 . The plastic lens element of claim 23 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the plastic lens element has an outer diameter length passing through and vertical to the optical axis;

wherein the lens thickness is CT, the outer diameter length is L, and the following condition is satisfied:

9.1

<

L

/

CT

<

4

⁢

0

.

29 . The plastic lens element of claim 22 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

30 . The plastic lens element of claim 23 , wherein the optical effective region has a lens thickness adjacent to the optical axis, an extending direction of the lens thickness is parallel to the optical axis, and the peripheral region has a plurality of peripheral thicknesses parallel to the optical axis;

wherein the lens thickness is CT, a smallest one of the peripheral thicknesses is ETmin, and the following condition is satisfied:

0.01

<

ET

⁢

min

/

CT

<

0

.

5

.

31 . An optical imaging module, having the optical axis, and comprising:

a plurality of lens elements, at least one of the lens elements being the plastic lens element of claim 22 .

32 . An electronic device, comprising:

the optical imaging module of claim 31 .