Ocular optical system
AssigneeGenius Electronic Optical Co., Ltd.
InventorsMatthew Bone, Ruyou Tang, Tacheng Fan
Life of this patent
Estimating the term…
Abstract
Present embodiments provide for an ocular optical system. The ocular optical system includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an eye-side to an display-side. Through designing parameters satisfying at least two inequalities and convex and/or concave surface of lens elements, the improved ocular optical system may provide better optical characteristics, a decreased effective focal length and an enlarged angle of view while the total length of the ocular optical system may be shortened.
Claims16
An ocular optical system, adapted for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen, a side facing towards the eye being an eye-side, a side facing towards the display screen being a display-side, the ocular optical system comprising a first lens element, a second lens element, a third lens element and a fourth element from the eye-side to the display-side in order along an optical axis, each of the first, second, third, and fourth lens elements having an eye-side surface facing toward the eye-side and a display-side surface facing toward the display-side, wherein:
- the display-side surface of the second lens element has a convex portion in a vicinity of the optical axis;
- the display-side surface of the third lens element has a concave portion in a vicinity of the optical axis;
- the eye-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis;
- an effective focal length of the ocular optical system is represented by EFL, an air gap between the fourth lens element and a display screen along the optical axis is represented by G4D, and EFL and G4D satisfy the inequality:
- EFL/G4D≥2.4;
- and
- the ocular optical system comprises no other lenses having refracting power beyond the first, second, third and fourth lens elements.
An ocular optical system, adapted for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen, a side facing towards the eye being an eye-side, a side facing towards the display screen being a display-side, the ocular optical system comprising a first lens element, a second lens element, a third lens element and a fourth element from the eye-side to the display-side in order along an optical axis, each of the first, second, third, and fourth lens elements having an eye-side surface facing toward the eye-side and a display-side surface facing toward the display-side, wherein:
- the second lens element has positive refracting power;
- the display-side surface of the third lens element has a concave portion in a vicinity of the optical axis;
- the eye-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis;
- an effective focal length of the ocular optical system is represented by EFL, an air gap between the fourth lens element and a display screen along the optical axis is represented by G4D, and EFL and G4D satisfy the inequality:
- EFL/G4D≥2.4;
- and
- the ocular optical system comprises no other lenses having refracting power beyond the first, second, third and fourth lens elements.
An ocular optical system, adapted for imaging of imaging rays entering an eye of an observer via the ocular optical system from a display screen, a side facing towards the eye being an eye-side, a side facing towards the display screen being a display-side, the ocular optical system comprising a first lens element, a second lens element, a third lens element and a fourth element from the eye-side to the display-side in order along an optical axis, each of the first, second, third, and fourth lens elements having an eye-side surface facing toward the eye-side and a display-side surface facing toward the display-side, wherein:
- the display-side surface of the first lens element has a convex portion in a vicinity of the optical axis;
- the display-side surface of the third lens element has concave portion in a vicinity of the optical axis;
- the eye-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis;
- an effective focal length of the ocular optical system is represented by EFL, an air gap between the fourth lens element and a display screen along the optical axis is represented by G4D, and EFL and G4D satisfy the inequality:
- EFL/G4D≥2.4;
- and
- the ocular optical system comprises no other lenses having refracting power beyond the first, second, third and fourth lens elements.
Dependencies are inferred from the claim text.