3results about How to "Dispersion suppression" patented technology

The invention provides an optical system and electronic equipment. The optical system comprises a lens group, the lens group comprises a first lens group, a second lens group and a third lens group, and the first lens group comprises a first lens, a second lens and a third lens; the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the third lens group comprises a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens; the optical system satisfies the following conditions: 1.85 < FG1 / FG3 < 2.95; f23 / (CT2 + CT3) is more than-10.90 and less than-9.10; f45 / T34 is more than 1.90 and less than 3.60; fG1 is the combined focal length of the first lens group, FG3 is the combined focal length of the third lens group, F23 is the combined focal length of the second lens and the third lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, F45 is the combined focal length of the fourth lens and the fifth lens, and T34 is the air interval between the third lens and the fourth lens on the optical axis. The optical system realizes the balance of high performance and miniaturization.

This invention relates to the field of optical lens technology, and more particularly to an optical system for a large-aperture full-frame fixed-focus lens. It includes a first objective lens group, a second objective lens group, and a third objective lens group arranged sequentially from the object side to the image side along the optical axis. The third objective lens group includes an aperture stop. During focusing, the second objective lens group moves along the optical axis to the image side, while the positions of the first objective lens group, the aperture stop, and the third objective lens group relative to the image plane remain unchanged. This invention's optical system for a large-aperture full-frame fixed-focus lens optimizes light refraction and convergence, balances aberrations, and improves image quality by setting the positive and negative optical powers of each lens group and the ratio between the combined focal length of each lens group and the combined focal length of the entire lens. This further enables the lens to achieve higher image quality.

The application provides a light guide plate, a backlight module and a display device, and relates to the technical field of light guide plates. The light guide plate comprises an incident light surface, a bottom surface and an exit light surface. The incident light surface is used for receiving light emitted by a light source and guiding the light into the light guide plate. The bottom surface is provided with a plurality of optical microstructures. The optical microstructures are used for reflecting and / or refracting the light in the light guide plate to the exit light surface for emission. The optical microstructures comprise a first light surface. In a first direction, the first tangent slope of the first surface type of the first light surface changes according to a second preset rule. In a second direction, the second tangent slope of the first surface type of the first light surface changes according to a third preset rule. The first direction is perpendicular to the incident light surface. The second direction is parallel to the bottom surface and perpendicular to the first direction. Through the design of the first tangent slope and the second tangent slope of the first surface type of the first light surface, the application can inhibit the occurrence of dispersion and hot spot phenomena.