Abstract: An optical imaging lens includes, in order from an object side to an image side, an aperture, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens has positive refractive power and includes an object-side surface being convex; the second lens has negative refractive power and includes an object-side surface being concave; the third lens has positive refractive power and includes an object-side surface being convex and an image-side surface being convex; the fourth lens has positive refractive power and includes an object-side surface being concave and an image-side surface being convex; the fifth lens has negative refractive power and includes an object-side surface being concave. When specific conditions are satisfied, the optical imaging lens can have a compact size, high thermal endurance and good imaging qualities.

Abstract: An optical imaging lens including an optical lens assembly with an optical axis, a lens barrel and a conductive element is disclosed. The optical lens assembly includes a plurality of lenses. The lens barrel includes an inner wall surface and a heating film, wherein the inner wall surface surrounds the optical axis and is made of electrical insulating material, and the heating film is formed on the inner wall surface. The optical lens assembly is disposed in the lens barrel in order from an object side to an image side. An edge of at least one lens of the optical lens assembly contacts the heating film. The conductive element is extended along the inner wall surface of the lens barrel, and is electrically connected to the heating film. One terminal of the conductive element is connected to an external power supply.

Abstract: A multi-element optical substrate preparation method includes the steps of: a) preparing a first element having a center hole and a core positioning device defining a first element center line; b) preparing a mold having a mold cavity and a cavity center line, and then placing the first element in the mold to keep a predetermined part of the first element in contact with the mold cavity; c) calibrating the position of the core positioning device of the first element in the mold cavity subject to the reference of the cavity center line of the mold; d) filling a transparent plastic material into the mold cavity of the mold for enabling the transparent plastic material to be molded on the first element and cured into a second element so that the first element and the second element form an optical substrate; and e) opening the mold and taking the optical substrate out of the mold.

Abstract: A zoom lens assembly and zoom lens module are provided, including a first lens, a second lens, a plurality of guiding blocks, a sheathing tube, a plurality of linking members and an adjusting tube. The first lens includes a plurality of curved surfaces disposed on a second lens surface toward a first lens surface. The second lens includes a plurality of driving rods disposed on a third lens surface and abutting the curved surfaces. The guiding blocks are respectively fixed on the first lens. The sheathing tube sheathes the first lens and the second lens and comprises a plurality of guiding notches to receive the guiding blocks, and a plurality of slits. The linking members pass through the slits and are fixed on the second lens. The adjusting tube sheathes the sheathing tube and comprises a plurality of driving notches to receive the linking members.

Abstract: A zoom lens assembly and zoom lens module are provided, including a first lens, a second lens, a plurality of guiding blocks, a sheathing tube, a plurality of linking members and an adjusting tube. The first lens includes a plurality of curved surfaces disposed on a second lens surface toward a first lens surface. The second lens includes a plurality of driving rods disposed on a third lens surface and abutting the curved surfaces. The guiding blocks are respectively fixed on the first lens. The sheathing tube sheathes the first lens and the second lens and comprises a plurality of guiding notches to receive the guiding blocks, and a plurality of slits. The linking members pass through the slits and are fixed on the second lens. The adjusting tube sheathes the sheathing tube and comprises a plurality of driving notches to receive the linking members.

Abstract: A focus adjustment module is disclosed and includes a first optical element disposed along an optical axle, a guiding track unit, a guiding unit and a controller. The guiding unit includes a holder for the optical element to be assembled thereon and a flexible member to connect to the holder. The flexible member includes an inner section to connect to the holder, an outer section and a middle controlling section. The controller moves along a control path intersecting the optical axle. The middle controlling section is sustained in a non-deformed state non-parallel to the control path. When moving from the initial position to the control position, the controller moves from the outer section to the middle controlling section to force the middle controlling section to become deformed and to link to the optical element and move it between the origin and the focus adjustment point along the optical axle.

Abstract: A gear-forming cutter for forming a gear tooth on a non-metallic blank includes a spindle and a blade portion. The blade portion extends from the spindle along an axis of the spindle, and includes a blade surface and a surrounding surface. The blade surface has front and rear sides, and opposite first and second lateral sides. The surrounding surface is disposed around the axis, and extends from the first lateral side to the second lateral side. Any point of the first lateral side is spaced apart from the axis by a first radial distance. Any point of the second lateral side is spaced apart from the axis by a second radial distance smaller than the corresponding first radial distance. The first radial distance corresponding to the rear side is larger than that corresponding to the front side.

Abstract: A gear-forming cutter for forming a gear tooth on a non-metallic blank includes a spindle and a blade portion. The blade portion extends from the spindle along an axis of the spindle, and includes a blade surface and a surrounding surface. The blade surface has front and rear sides, and opposite first and second lateral sides. The surrounding surface is disposed around the axis, and extends from the first lateral side to the second lateral side. Any point of the first lateral side is spaced apart from the axis by a first radial distance. Any point of the second lateral side is spaced apart from the axis by a second radial distance smaller than the corresponding first radial distance. The first radial distance corresponding to the rear side is larger than that corresponding to the front side.