Optical lens module and virtual reality device
The present disclosure discloses an optical lens module and a virtual reality device. The optical lens module includes: a lens assembly, and transflective layers attached to surfaces on a light incident side and a light emitting side of the lens assembly. The lens assembly includes a central region and at least one annular region surrounding the central region. The central region has a refractive index smaller than the at least one annular region. When more than one annular region is provided, the annular regions are sequentially arranged layer by layer, the annular region located on the outermost side has the maximum refractive index, and for any other annular region, the refractive index is smaller than that of the annular region located outside thereof.
1. An optical lens module, comprising: a lens assembly, and transflective layers attached to surfaces on a light incident side and a light emitting side of the lens assembly,
wherein the lens assembly comprises a central region and at least one annular region surrounding the central region; and
wherein the central region has a refractive index smaller than that of the at least one annular region,
when more than one annular region is provided, the annular regions are sequentially arranged layer by layer, the annular region located on the outermost side has the maximum refractive index, and for any other annular region, the refractive index is smaller than that of the annular region located outside thereof.
2. The optical lens module according to claim 1 , wherein the central region has a circular shape, and the annular region has a ring shape.
3. The optical lens module according to claim 1 , wherein the lens assembly comprises: at least one magnifying lens arranged in sequence along an optical axis direction of the lens assembly.
4. The optical lens module according to claim 3 , wherein the magnifying lens comprises: a liquid crystal lens.
5. The optical lens module according to claim 3 , wherein the magnifying lens comprises at least one of a plano-convex lens, a biconvex lens, and a meniscus lens.
6. The optical lens module according to claim 3 , wherein the magnifying lens comprises a first magnifying lens and a second magnifying lens, and an optical axis of the first magnifying lens is collinear with an optical axis of the second magnifying lens.
7. The optical lens module according to claim 6 , wherein the first magnifying lens and/or the second magnifying lens is a radial gradient index lens having a smaller refractive index at a center than at an edge.
8. The optical lens module according to claim 6 , wherein each of the first magnifying lens and the second magnifying lens is a plano-convex lens, a planar optical surface of the first magnifying lens is attached to a planar optical surface of the second magnifying lens, and the two transflective layers are respectively attached to a convex optical surface of the first magnifying lens and a convex optical surface of the second magnifying lens.
9. The optical lens module according to claim 1 , wherein the transflective layer is selected from one of:
a transflective film adhered to a surface of the lens assembly by a film adhesion process; and
a transflective film deposited on a surface of the lens assembly by a coating process.
10. A virtual reality device, comprising: an optical lens module according to claim 1 .
11. The virtual reality device according to claim 10 , further comprising: a display screen located on the light incident side of the lens assembly.
12. The virtual reality device according to claim 10 , wherein the virtual reality device is a glasses-type virtual reality device or a helmet-type virtual reality device.