Flash lens of electronic device

1. An electronic device comprising:

a first camera module; and

a flash module disposed adjacent to the first camera module,

wherein the flash module comprises:

an LED configured to emit light; and

an optical lens disposed in a traveling direction of the light emitted from the LED,

wherein the optical lens includes a first surface in a first direction facing the LED and a second surface in a second direction opposite the first surface,

wherein the second surface of the optical lens includes a first translucent area including a central area where the light emitted from the LED is incident and a second translucent area spaced apart from the first translucent area, and

wherein the first translucent area has a transparency of at least 25%.

2. The electronic device of claim 1 , wherein the first translucent area is located at a central portion of the second surface, and

wherein the second translucent area is located in a peripheral portion of the second surface.

3. The electronic device of claim 1 , wherein the first surface of the optical lens further comprises a diffusion pattern area configured to diffuse the light emitted from the LED.

4. The electronic device of claim 1 , further comprising a transparent area between the first surface and the second surface.

5. The electronic device of claim 1 , wherein transmittance of the first translucent area and transmittance of the second translucent area are the same.

6. The electronic device of claim 1 , wherein a size and a position of the first translucent area correspond to a size and a position of the LED.

7. The electronic device of claim 1 , wherein a size and a position of the second translucent area are determined based on a variable K indicating a positional relationship between the first camera module and the LED.

8. The electronic device of claim 7 , further comprising a first point and a second point,

wherein the first point and the second point are positioned on the second surface,

wherein the first point is a point on the second surface closest to a center of the first camera module when viewed from a front of the electronic device, and

wherein the second point is a point on the second surface farthest from the center of the first camera module when viewed from the front of the electronic device.

9. The electronic device of claim 8 , wherein the second translucent area comprises a bow-shaped area formed between the first point and a third point, and a bow-shaped area formed between the second point and a fourth point,

wherein the third point is formed at a position spaced apart from the first point by the variable K in a direction of a center of the second surface, and

wherein the fourth point is formed at a position spaced apart from the second point by the variable K in the direction of the center of the second surface.

10. The electronic device of claim 8 , wherein the size of the second translucent area is determined according to the variable K, and

wherein the variable K satisfies the following conditions (1), (2), (3) and (4),

X=h /tan(90− a/ 2)°  (1)

wherein h is a distance between the center of the first camera module and a subject, and a is a field of view (fov) of the first camera module,

Y=h /tan(90− b/ 2)°  (2)

wherein b is a field of view (fov) of the LED,

Z=X−Y+c   (3)

wherein c is a distance between the first camera module and the LED, and

K =( Z*d )/2 Y   (4)

wherein d is a diameter of the LED.

11. The electronic device of claim 1 , wherein an emission area of the LED overlaps a field of view (fov) of the first camera module.

12. The electronic device of claim 1 , further comprising a second camera module.

13. The electronic device of claim 12 , wherein a size and a position of the second translucent area are determined according to a variable K1 indicating a positional relationship between the first camera module and the LED, and a variable K2 indicating a positional relationship between the second camera module and the LED.

14. The electronic device of claim 13 , wherein the variable K1 satisfies the following conditions (1), (2), (3), and (4), and the variable K2 satisfies the following conditions (5), (6), (7), and (8),

X 1= h 1/tan(90− a 1/2)°  (1)

wherein h1 is a distance between a center of the first camera module and a subject, and a1 is a field of view (fov) of the first camera module,

Y 1= h 1/tan(90− b 1/2)°  (2)

wherein b1 is a field of view (fov) of the LED,

Z 1= X 1− Y 1+ c 1   (3)

wherein c1 is a distance between the first camera module and the LED,

K 1=( Z 1* d 1)/2 Y 1   (4)

wherein d1 is a diameter of the LED,

X 2= h 2/tan(90− a 2/2)°  (5)

wherein h2 is a distance between the center of the second camera module and the subject, and a2 is a field of view (fov) of the second camera module,

Y 2= h 2/tan(90− b 1/2)°,   (6)

Z 2= X 2− Y 2+ c 2   (7)

wherein c2 is a distance between the second camera module and the LED, and

K 2=( Z 2* d 1)/2 Y 2.   (8)

15. The electronic device of claim 14 , wherein the second surface comprises a first point, a second point, a third point, and a fourth point,

wherein the first point is a point on the second surface closest to the center of the first camera module when viewed from a front of the electronic device,

wherein the second point is a point on the second surface farthest from the center of the first camera module when viewed from the front of the electronic device,

wherein the third point is a point on the second surface closest to the center of the second camera module when viewed from the front of the electronic device, and

wherein the fourth point is a point on the second surface farthest from the center of the second camera module when viewed from the front of the electronic device.

16. The electronic device of claim 15 , wherein the second translucent area comprises a first intermediary translucent area and a second intermediary translucent area,

wherein the first intermediary translucent area includes a bow-shaped area formed between the first point and a fifth point, and a bow-shaped area formed between the second point and a sixth point, wherein the fifth point is formed at a position spaced apart from the first point by the variable K1 in a direction of a center of the second surface, and wherein the sixth point is formed at a position spaced apart from the second point by the variable K1 in the direction of the center of the second surface,

wherein the second intermediary translucent area includes a bow-shaped area formed between the third point and a seventh point, and a bow-shaped area formed between the fourth point and a eighth point, wherein the seventh point is formed at a position spaced apart from the third point by the variable K2 in the direction of the center of the second surface, and wherein the eighth point is formed at a position spaced apart from the fourth point by the variable K2 in the direction of the center of the second surface, and

wherein the second translucent area is only portions of the first intermediary translucent area and the second intermediary translucent area that overlap each other.

17. The electronic device of claim 1 , wherein the first translucent area and the second translucent area are implemented using methods of sand-blasting, acid-etching, and/or attaching a translucent film.

18. An electronic device comprising,

a first camera module; and

a flash module disposed adjacent to the first camera module,

wherein the flash module comprises:

an LED configured to emit light; and

an optical lens disposed in a traveling direction of the light emitted from the LED,

wherein the optical lens includes a first direction facing the LED and a second surface in a second direction opposite of the first surface,

wherein the second surface of the optical lens includes a first translucent area including a central area where the light emitted from the LED is incident and a second translucent area and a transparent area formed between the first translucent area and the second translucent area.

19. The electronic device of claim 18 , wherein transmittance of the transparent area is higher than transmittance of the first translucent area and transmittance of the second translucent area.

20. The electronic device of claim 18 , wherein the second surface is configured in a circular shape overlapping at least a central portion of the LED when viewed from a front of the electronic device.