4results about How to "Corrected astigmatism" patented technology

This application relates to a femtosecond laser multi-degree-of-freedom personalized reshaping method and system for intracorneal implants, belonging to the field of femtosecond laser processing technology. Utilizing the cold processing characteristics of femtosecond lasers, the intracorneal implant is individually cut and ablated to obtain the desired three-dimensional corneal shape, precisely shaping the curvature, thickness, and contour of the lens to perfectly match the patient's corneal capsule or lesion area. By leveraging the nonlinear optical effect induced at the focal point of the femtosecond laser, the stromal collagen network in the weak areas corresponding to corneal expansion can be densified through laser processing, significantly improving the local elastic modulus and resistance to deformation. In areas requiring a smooth transition with the recipient cornea or adjustment of refractive power, controllable micropores or low-density areas can be induced, appropriately reducing local stiffness, thereby achieving a spatial gradient distribution of internal mechanical properties and customizing the overall mechanical behavior and morphological stability after implantation.

This invention provides a projection lens. The projection lens includes a lens group comprising at least eight lenses, which, from a first side to a second side, are sequentially: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, a seventh lens with optical power, and an eighth lens with optical power. At least one group of lenses from the fourth to the eighth lens is cemented together to form a cemented doublet lens or a cemented triplet lens. The ratio between the combined focal length of the cemented doublet lens and the focal length of the second lens group is greater than or equal to 1 and less than or equal to 8; or, the ratio between the focal length of the cemented triplet lens and the focal length of the second lens group is greater than or equal to 0 and less than or equal to 14. This invention solves the problem in existing projection lenses where it is difficult to simultaneously achieve both high-quality projection and miniaturization.

The embodiment of the invention discloses an ultraviolet ultrafast laser telecentric lens group and laser processing equipment, the ultraviolet ultrafast laser telecentric lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the incident direction of light, the first lens is a biconvex positive lens, the second lens is a biconcave negative lens, and the fifth lens is a biconvex negative lens. The third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, and the fifth lens is a biconvex positive lens. According to the ultraviolet ultrafast laser telecentric lens group, an exit pupil is located at the infinite position of an image space, main light rays of a focused light beam are perpendicular to a focal plane under the condition of any full field angle, perforation inclination is avoided, astigmatism and distortion of the laser telecentric lens group are effectively corrected, an image space telecentric light path is achieved, and the imaging quality is improved. In addition, the lens is simple in structure and convenient to design, and can be widely applied to various fine laser processing devices.

This invention provides an optical lens and an electronic device having the same. The optical lens includes: a first lens with negative optical power, having a first convex side and a second concave side; a second lens with negative optical power, having a first concave side and a second convex side; a third lens with positive optical power, having a first convex side and a second convex side; a fourth lens with positive optical power, having a first convex side and a second convex side; a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power; or a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power; satisfying: (FOV×F) / H≥95. This invention solves at least one of the problems in existing optical lenses: the inability to simultaneously achieve miniaturization and high resolution, pixel differences, poor image quality in low-light environments, and the inability to match the center angular resolution with higher pixel chips while satisfying a large field of view.