Abstract: An optical lens, along optical axis from object side to imaging plane, sequentially includes: a first lens (L1) having negative optical power, convex object-side surface (S1) and concave image-side surface; a second lens (L2) having positive optical power, concave object-side surface (S3) and convex image-side surface (S4); a stop (ST); a third lens (L3) having positive optical power, convex object-side surface (S5) and image-side surface (S6); a fourth lens (L4) having positive optical power, convex object-side surface (S7) and image-side surface (S8); a fifth lens (L5) having negative optical power, concave object-side surface (S9) and image-side surface (S10); and a sixth lens (L6) having positive optical power, convex object-side surface (S11) and concave image-side surface (S12). The fourth lens (L4) and fifth lens (L5) form a cemented lens. True image height IH corresponding to maximal field of view and effective focal length f satisfy: 0.6 < f / IH < 0 . 7 .

Abstract: An optical lens having six lenses along an optical axis from an object side to an image plane, sequentially comprises: a first negative optical power lens, first object side concave surface, second image side concave surface; a second negative optical power lens, third object side concave surface, fourth image side convex surface; a third positive optical power lens, fifth object side convex surface, sixth image side convex surface; a fourth positive optical power lens, seventh object side convex surface, eighth image side convex surface; a fifth negative optical power lens, ninth object side surface being concave, tenth image side convex surface; a sixth positive optical power lens, eleventh object side convex surface, and twelfth image side concave surface. Fourth and fifth lenses are adhered together to form a cemented lens. Real image height IH corresponding to maximal field of view and optical lens effective focal length f satisfy: 0.55<f/H<0.65.

Abstract: An injection molding adaptive compensation method based on melt viscosity fluctuation comprising: initializing equipment; in a pre-calculation stage, introducing melt into a mold cavity at a constant rate, collecting pre-calculation parameters in each sampling period T, and obtaining a first injection work in the pre-calculation stage by using a first calculation formula; in a self-adaptation stage, introducing the melt into the mold cavity at a constant rate, collecting adaptive parameters in each sampling period T, and obtaining a second injection work in the self-adaptation stage by using a second calculation formula; calling the PVT characteristics of current processing raw materials to construct a PVT relation function, and obtaining an optimized V/P switching point by using a PVT weight control model; and according to the injection work at the pre-calculation stage and the injection work at the present stage, obtaining an optimized holding pressure according to an injection work adjustment model.

Abstract: An injection molding adaptive compensation method based on melt viscosity fluctuation comprising: initializing equipment; in a pre-calculation stage, introducing melt into a mold cavity at a constant rate, collecting pre-calculation parameters in each sampling period T, and obtaining a first injection work in the pre-calculation stage by using a first calculation formula; in a self-adaptation stage, introducing the melt into the mold cavity at a constant rate, collecting adaptive parameters in each sampling period T, and obtaining a second injection work in the self-adaptation stage by using a second calculation formula; calling the PVT characteristics of current processing raw materials to construct a PVT relation function, and obtaining an optimized V/P switching point by using a PVT weight control model; and according to the injection work at the pre-calculation stage and the injection work at the present stage, obtaining an optimized holding pressure according to an injection work adjustment model.