Abstract: The disclosure provides a visual system, sequentially including a first lens assembly and a second lens assembly from a first side to a second side along an optical axis, the first lens assembly includes a first lens with a positive refractive power, a reflective polarizing element, and a quarter-wave plate; the second lens assembly includes a second lens with a positive refractive power, a partially-reflective element, and a third lens, and the second lens and the third lens are cemented to each other; and the second lens assembly is able to move along the optical axis to cause the visual system to switch between a first state and a second state. A combined focal length fz of the first lens assembly and a focal length fm of the system in the first state satisfy 5.69?fz/fm?8.09.

Abstract: The disclosure provides a visual system, sequentially including from a first side to a second side along an optical axis: a first lens with a positive refractive power, a reflective polarizing element, a quarter-wave plate, a second lens with a positive refractive power, a partially-reflective element and a third lens with a positive refractive power. A position of the first lens on the optical axis relative to an imaging surface of the second side is fixed, and a distance of the second lens on the optical axis relative to the first lens is adjustable. The visual system satisfies: 1.15?fg/f2?1.50 and 1.55<?L/?f<2.1.

Abstract: The disclosure provides a visual system, sequentially including, from a first side to a second side along an optical axis: a first lens with a positive refractive power, a second lens, a third lens, a partially-reflective element, a fourth lens with a negative refractive power, a second quarter-wave plate and a polarizing filter. The visual system further includes a reflective polarizing element and a first quarter-wave plate attached to each other; an included angle ?1.0 between the optical axis and a tangent of a second side surface of the third lens at a position of an intersection point of a chief ray in a 1.0 field of view after being reflected by the partially-reflective element and the second side surface of the third lens satisfies: 80.5°<?1.0<83.2°.

Abstract: The disclosure provides an optical module and a VR eyepiece system. The optical module sequentially includes along an optical axis from an eye side to an image side: a cemented lens group, including a pair of plano-convex lenses, a first transflective film located between the pair of plano-convex lenses, a pair of first quarter-wave plates respectively arranged outside of the pair of plano-convex lenses, a pair of first polarizing reflective films respectively arranged outside of the pair of first quarter-wave plates; a refraction and reflection assembly, including a third lens, and a second quarter-wave plate and a second transflective film which are respectively arranged at an eye-side surface and an image-side surface of the third lens. In this way, light achieves multiple reflections within the cemented lens group, which is also able to increase an optical energy utilization of the cemented lens group while achieving folding of an optical path.

Abstract: The present disclosure discloses an optical system, including: a first lens having a positive refractive power, a reflective polarizing element, a first quarter wave plate, a second lens having a positive refractive power, a third lens having a negative refractive power, a partially reflective element, a fourth lens having a refractive power, a second quarter wave plate and a polarizer. An effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy: 0.15<f2/f1<1.6; and center thicknesses CT1, CTR, CTQ1 and CT2 of the first lens, the reflective polarizing element, the first quarter wave plate and the second lens respectively on the optical axis satisfy: 0.35<(CT1+CTR)/(CTQ1+CT2)<1.05.