5results about How to "Optical total length" patented technology

This application discloses a visible light optical system and a visible light optical lens. The visible light optical system includes a superlens, a first aspherical lens, a second aspherical lens, a third aspherical lens, and a fourth aspherical lens. The first, second, third, and fourth aspherical lenses are arranged sequentially along the optical axis from the object side to the image side. The superlens has a positive optical power. The first aspherical lens has a positive optical power, and both its object-side and image-side surfaces are convex towards the object side. The second aspherical lens has a negative optical power, and both its object-side and image-side surfaces are convex towards the image side. The third aspherical lens has a positive optical power, and both its object-side and image-side surfaces are convex towards the image side. The fourth aspherical lens has a negative optical power. The visible light optical system combines a superlens with a traditional refractive lens, giving it advantages such as low cost, small size, and excellent imaging quality.

The invention relates to a small telephoto lens for portable code scanning equipment and a working method of the small telephoto lens. The small telephoto lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged in the light incidence direction, and a diaphragm is arranged between the third lens and the fourth lens. The second lens and the third lens are glued to form a balsaming lens group A, and the fourth lens and the fifth lens are glued to form a balsaming lens group B. According to the invention, the design of six glass spherical lenses is adopted, and the parameters and the on-axis distance of each lens are optimized, so that the optical performance of high resolution and long focal length can be satisfied, and meanwhile, the optical system has the advantages of low distortion and high illumination; and the total length of the lens is smaller, so that the miniaturization requirement of portable code scanning equipment is met.

The embodiment of the application provides an optical module and a smart head-mounted device; the optical module comprises a display screen, a first lens and a second lens arranged along the same optical axis; wherein the first lens is located between the display screen and the second lens, the first lens is a flat-concave lens, and the flat surface of the first lens is glued to the display screen; a light splitting element is arranged on the surface of the first lens away from the display screen, a phase retarder and a polarization reflection element are stacked on the surface of the second lens close to the display screen, and the phase retarder is located between the light splitting element and the polarization reflection element.

The optical lens module comprises a display image source for emitting circularly polarized light rays propagating along a first light propagation direction; a first lens having a convex or planar light entrance surface and a convex light exit surface, through which the circularly polarized light rays are propagated to the light entrance surface and the light exit surface of a second lens; the second lens has a convex light entrance surface and a convex light exit surface; the third lens has a concave light entrance surface and a planar light exit surface, and an optical composite film layer is arranged on the light exit surface of the third lens; based on the optical composite film layer, the polarization state of the circularly polarized light rays is adjusted to form first linearly polarized light propagating along a second propagation direction, the first linearly polarized light is converted into second circularly polarized light, and the second circularly polarized light is converted into second linearly polarized light to pass through the light exit surface of the third lens through folding of the light path, so as to ensure good imaging effect, reduce the total optical length, and reduce the volume and weight.

The invention discloses an optical system, a pick-up lens and an electronic device, and aims to realize lightening and thinning and shorter total length of the optical system and improve the pixel and imaging quality of the optical system. The optical system sequentially comprises a diaphragm, a first lens with positive focal power, a second lens with negative focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with positive focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the first lens, the object side surface of the second lens, the image side surface of the third lens, the image side surface of the fifth lens and the object side surface of the sixth lens are convex surfaces in a paraxial region. The image side surface of the first lens, the image side surface of the second lens, the object side surface of the third lens, the object side surface of the fifth lens, the image side surface of the sixth lens, and the object side surface and the image side surface of the seventh lens are concave surfaces at a paraxial region. The optical system satisfies the relational expression: 1.45 lt; fNOlt, FNOlt; 1.9, 79 degree lt; a FOVlt; the angle is 91 degrees, 1.2 lt; and TTL / ImgHlt; and 1.4.