OPTICAL SYSTEM
An optical system is provided. The optical system includes a light source assembly, a sensing element, and a light guiding element. The light source assembly is used for generating first light and second light. The sensing element is used for sensing third light from the second light reflected by an eye. The light guiding element is used for transporting the first light, the second light, and the third light. Wavelengths of the first light and the second light are different.
1 . An optical system, comprising:
a light source assembly used for generating first light and second light;
a sensing element used for sensing third light from the second light reflected by an eye; and
a light guiding element used for transporting the first light, the second light, and the third light, wherein wavelengths of the first light and the second light are different.
2 . The optical system as claimed in claim 1 , wherein:
the light guiding element comprises a first surface;
the first surface faces the light source assembly;
the first surface faces the eye;
the wavelength of the first light is less than the wavelength of the second light.
3 . The optical system as claimed in claim 2 , further comprising a first optical assembly disposed on the first surface, wherein the first optical assembly is disposed between the light source assembly and the light guiding element.
4 . The optical system as claimed in claim 3 , wherein:
the light guiding element further comprises a first side;
the first surface is adjacent to the first side;
the sensing element is disposed on the first side;
the first surface and the first side are not parallel.
5 . The optical system as claimed in claim 3 , wherein the light source assembly comprises a plurality of light source units, each of the light source units comprises a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, and a fourth light-emitting unit, wherein:
lights of the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the fourth light-emitting unit have different wavelengths;
the fourth light-emitting unit is disposed between the first light-emitting unit and the second light-emitting unit;
the third light-emitting unit is strip-shaped;
the third light-emitting unit extends in an axis parallel to an axis that the first light-emitting unit and the second light-emitting unit are arranged.
6 . The optical system as claimed in claim 5 , wherein:
the third light-emitting unit extends in the axis parallel to an axis that the first light-emitting unit and the fourth light-emitting unit are arranged;
an area of the third light-emitting unit is greater than an area of the first light-emitting unit;
the area of the third light-emitting unit is greater than an area of the second light-emitting unit;
the area of the third light-emitting unit is greater than an area of the fourth light-emitting unit.
7 . The optical system as claimed in claim 6 , wherein:
the first surface faces the sensing element;
the sensing element is disposed in the light source assembly.
8 . The optical system as claimed in claim 7 , wherein:
the sensing element is disposed between the third light-emitting unit and the first light-emitting unit;
the sensing element is disposed between the third light-emitting unit and the second light-emitting unit;
the sensing element is disposed between the third light-emitting unit and the fourth light-emitting unit.
9 . The optical system as claimed in claim 8 , wherein:
the sensing element and the first light-emitting unit are arranged in an axis different from an axis that the sensing element and the second light-emitting unit are arranged;
the sensing element and the first light-emitting unit are arranged in the axis different from an axis that the sensing element and the fourth light-emitting unit are arranged.
10 . The optical system as claimed in claim 9 , wherein the sensing element and the second light-emitting unit are arranged in the axis different from the axis that the sensing element and the fourth light-emitting unit are arranged.
11 . The optical system as claimed in claim 3 , further comprising a second optical assembly and a third optical assembly disposed on the first surface, wherein:
the second optical assembly is disposed on the first surface;
the first light, the second light, and the third light pass through the second optical assembly;
the second light passes through the third optical assembly.
12 . The optical system as claimed in claim 11 , wherein:
the light source assembly comprises a first light source and a second light source;
the first optical assembly is disposed between the first light source and the light guiding element;
the third optical assembly is disposed between the second light source and the light guiding element.
13 . The optical system as claimed in claim 12 , wherein:
the first light source and the second light source are disposed on opposite sides of a virtual plane;
the first optical assembly and the third optical assembly are separated from each other.
14 . The optical system as claimed in claim 13 , wherein:
the second optical assembly and the third optical assembly are separated from each other;
the second optical assembly is disposed between the first optical assembly and the third optical assembly.
15 . The optical system as claimed in claim 14 , wherein:
the third light passes through the third optical assembly;
the sensing element is disposed in the second light source;
16 . The optical system as claimed in claim 15 , wherein the first surface faces the sensing element.
17 . The optical system as claimed in claim 14 , wherein:
the sensing element and the first light source are disposed on an identical side of the virtual plane;
the sensing element and the first optical assembly are disposed on an identical side of the virtual plane.
18 . The optical system as claimed in claim 17 , wherein:
the sensing element and the second light source are disposed on opposite sides of the virtual plane;
the sensing element and the second optical assembly are disposed on opposite sides of the virtual plane.
19 . The optical system as claimed in claim 14 , wherein:
the sensing element and the first light source are disposed on opposite sides of the virtual plane;
the sensing element and the first optical assembly are disposed on opposite sides of the virtual plane.
20 . The optical system as claimed in claim 19 , wherein:
the sensing element and the second light source are disposed on an identical side of the virtual plane;
the sensing element and the second optical assembly are disposed on an identical side of the virtual plane.