Goertek Optical Technology Co., Ltd.

An optical system and a head mounted display are disclosed. The optical system comprises: a third lens, a second lens and a first lens arranged successively along a propagation direction of incident light. The effective focal length f1 of the first lens and the effective focal length f2 of the second lens are both greater than the effective focal length f of the optical system. The present disclosure provides a solution of a direct transmission optical structure, with short-focus, high light efficiency and high-resolution which has a good imaging quality.

Embodiments of the present disclosure provide an optical module and a head mounted display device. The optical module includes a display, a beam splitter, a phase retarder and a polarization reflecting element, wherein the phase retarder is provided between the beam splitter and the polarization reflecting element. The optical module further includes a first lens and a second lens arranged sequentially, the first lens is provided between the display and the beam splitter and the second lens is provided on one side of the beam splitter away from the display. A ratio of a difference between the optical effective aperture D 2 of the beam splitter and the height D 1 of the effective display area of the display to a distance T between the beam splitter to the display is 2 to 6. In the embodiment of the present disclosure, by providing an optical lens between the beam splitter and the display, the angle at which light is incident to the beam splitter and the angle at which light from the display is incident to the optical lens can be effectively constrained, thereby improving the light efficiency.

Embodiments of the present disclosure provide an optical module and a head mounted display; wherein, the optical module comprises a first lens, a second lens, and a third lens provided sequentially, a beam splitter is provided between the second lens and the first lens, and a first phase retarder and a polarization reflection film provided on either side of the third lens. The first lens is configured for transmitting incident light and an optical path difference between an optical path at a 1.0 aperture of the first lens and a central optical path of the first lens is 0.25˜0.5 times of the central optical path.

An optical system and a head mounted display are disclosed. The optical system comprises: a third lens, a second lens and a first lens arranged successively along a propagation direction of incident light. There are three Fresnel surfaces in the optical system, and two of the Fresnel surfaces are arranged adjacent to each other. The third lens has a positive focal power. A field of view of the optical system is ≥100 degrees. The present disclosure provides a solution of optical structure with short-focus, high light efficiency and large FOV. The optical system according to the present disclosure can be applied in, for example, a head mounted display.

The disclosure provides an optical module and a head mounted display. The optical module includes: a display screen with a size of D 1; a lens group located on a light-emitting side of the display screen; the lens group includes at least one lens; the optical module further includes a polarizing element, a beam splitting element and a phase retarder, wherein the polarizing element and the beam splitting element are provided with the at least one lens of the lens group therebetween, and the phase retarder is located on the light-emitting side of the display screen; wherein a distance from the beam splitting element to the display screen is A 3, which satisfies: 1 < ( D ⁢ 1 / 2 ) / A ⁢ 3 < 9.

An optical system and a head mounted display are disclosed. The optical system comprises: a third lens, a second lens and a first lens arranged successively along a propagation direction of incident light. There are two adjacent Fresnel surfaces in the optical system, and at least one of the Fresnel surfaces has a curved base. The present disclosure provides a solution of short-focus and lightweight optical structure, in which, compared with a flat base, the use of Fresnel surface having a curved base can improve the imaging quality to a certain extent, and can reduce the total optical length and the total weight of the optical system.

An imaging light path includes a display screen and a glued lens group. The display screen emits an imaging light ray. The glued lens group is disposed in the exit direction of the imaging light ray. The glued lens group comprises a first lens and a second lens. The first lens and the second lens are arranged successively along the propagation direction of the imaging light ray. The surface of the first lens facing the display screen is a first surface, and the first surface bulges toward the display screen. The first surface is provided thereon with a semi-reflective and semi-transmissive film. A glued film layer is provided between the first lens and the second lens. The glued film layer comprises a quarter wave plate and a reflective polarizing film arranged successively along the propagation direction of the imaging light ray.

The present disclosure provides an optical system and a head mount device. The optical system comprises: a first lens, a correcting lens, a first extension, and a second extension, the first lens comprising a first surface and a second surface provided oppositely; the correcting lens provided on the docking end-face of the first lens and comprising a third surface which is docked with the first surface, and a fourth surface which is docked with the second surface; the first extension being integrally formed with the first lens or the correcting lens, extending to and covering a docking location between the first surface and the third surface, the second extension being integrally formed with the first lens or the correcting lens, extending to and covering a docking location between the second surface and the fourth surface.

The disclosure discloses a projecting system. The projecting system includes a light source assembly, a polarization element, a light beam adjusting module, and a reflection component; the light beam adjusting module has an optical axis, and the light source assembly is located on a first side of the optical axis; light emitted by the light source assembly is transmitted through the polarization element to the light beam adjusting module, and at least central light of the light is incident from the first side of the optical axis into the light beam adjusting module and is shaped; light incident into the light beam adjusting module is reflected back to the light beam adjusting module by the reflection component, and at least central light of reflected light is emergent from a second side of the optical axis to form an image, and then is reflected by the polarization element and output.

Embodiments of the present disclosure provides a projection lens and a projecting device; wherein, the projection lens comprises a front lens group, a rear lens group and a stop, sequentially from an object side to an image side along the same optical axis, wherein the stop is located between the front lens group and the rear lens group; wherein the front lens group has a focal length of f 11 satisfying: 40 mm<f 11 <60 mm; the rear lens group has a focal length of f 22 satisfying: 2 mm<f 22 <12 mm.