A lens manufacturing method including a holding step of holding a lens in a lens holding fixture, and a machining step of machining a surface to be machined in the held lens. A reverse surface of the surface to be machined is machined into a non-planar shape with a first surface shape error. A lens holding surface of the lens holding fixture is machined into the same shape as the non-planar shape with a second surface shape error smaller than the first surface shape error. In the holding step, the reverse surface is brought into surface contact with the holding surface in imitation of the holding surface to correct the shape of the lens such that the reverse surface runs along the holding surface. In the machining step, the surface to be machined is machined in a state where the correction has been made by the holding step.

A lens manufacturing method including a holding step of holding a lens in a lens holding fixture, and a machining step of machining a surface to be machined in the held lens. A reverse surface of the surface to be machined is machined into a non-planar shape with a first surface shape error. A lens holding surface of the lens holding fixture is machined into the same shape as the non-planar shape with a second surface shape error smaller than the first surface shape error. In the holding step, the reverse surface is brought into surface contact with the holding surface in imitation of the holding surface to correct the shape of the lens such that the reverse surface runs along the holding surface. In the machining step, the surface to be machined is machined in a state where the correction has been made by the holding step.

A lens manufacturing method including a holding step of holding a lens in a lens holding fixture, and a machining step of machining a surface to be machined in the held lens. A reverse surface of the surface to be machined is machined into a non-planar shape with a first surface shape error. A lens holding surface of the lens holding fixture is machined into the same shape as the non-planar shape with a second surface shape error smaller than the first surface shape error. In the holding step, the reverse surface is brought into surface contact with the holding surface in imitation of the holding surface to correct the shape of the lens such that the reverse surface runs along the holding surface. In the machining step, the surface to be machined is machined in a state where the correction has been made by the holding step.

A lens manufacturing method including a holding step of holding a lens in a lens holding fixture, and a machining step of machining a surface to be machined in the held lens. A reverse surface of the surface to be machined is machined into a non-planar shape with a first surface shape error. A lens holding surface of the lens holding fixture is machined into the same shape as the non-planar shape with a second surface shape error smaller than the first surface shape error. In the holding step, the reverse surface is brought into surface contact with the holding surface in imitation of the holding surface to correct the shape of the lens such that the reverse surface runs along the holding surface. In the machining step, the surface to be machined is machined in a state where the correction has been made by the holding step.

The invention relates to a sub-aperture polishing tool, comprising a support member including an attachment feature for attachment to a sub-aperture polishing machine. At an end of the support member is a polishing head comprising: a base structure attached to or integral with the support member, the base structure being arranged to provide a non-flat surface. The polishing head also comprises an outer shell, at least part of the outer surface of which defines the working surface of the polishing tool, the outer shell being affixed to the base structure so as to enclose a cavity between the outer shell and the non-flat surface. A viscoelastic material filling the cavity, located between the outer shell and the base structure.

A polishing method comprising: arranging a polishing tool and a workpiece on lower and upper shaft sides of a polishing device, respectively, the polishing tool including: a polishing surface having a spherical zone shape; and a hole that is provided inside the polishing surface and concentric with an outer edge of the polishing surface around a rotation axis on a projection plane orthogonal to the rotation axis, a ratio of an outer diameter of the polishing surface to an inner diameter of the polishing surface being greater than 1.0 and 6.0 or less; and swinging the polishing tool relative to a reference point while rotating the polishing tool around the rotation axis. The reference point is positioned where a straight line, which passes through a center of the workpiece and intersects with the rotation axis, passes through a center of a spherical zone of the polishing surface in width direction.

A polishing tool includes a polishing surface having a spherical zone shape and having a plurality of non-contact portions provided from an inner edge to an outer edge of the polishing surface so as not to contact with a workpiece. The plurality of non-contact portions is a plurality of grooves whose widths in a circumferential direction increase from the inner edge toward the outer edge. A polishing method using the polishing tool includes: rotating the polishing tool about the central axis of rotation; and simultaneously with rotating the polishing tool, swinging relatively at least one of the workpiece and the polishing tool with a predetermined swing width, around a position where a line passing through a center of the workpiece and intersecting with the central axis of rotation passes through a center in a width direction of a spherical zone of the polishing surface, thereby polishing the workpiece.

A polishing tool includes a polishing surface having a spherical zone shape and having a plurality of non-contact portions provided from an inner edge to an outer edge of the polishing surface so as not to contact with a workpiece. The plurality of non-contact portions is a plurality of grooves whose widths in a circumferential direction increase from the inner edge toward the outer edge. A polishing method using the polishing tool includes: rotating the polishing tool about the central axis of rotation; and simultaneously with rotating the polishing tool, swinging relatively at least one of the workpiece and the polishing tool with a predetermined swing width, around a position where a line passing through a center of the workpiece and intersecting with the central axis of rotation passes through a center in a width direction of a spherical zone of the polishing surface, thereby polishing the workpiece.

A double-sided polishing method for an optical lens belongs to the technical field of ultra-precision machining. In the double-sided polishing method, upper and lower surfaces of the lens are polished simultaneously by arranging abrasive tools on upper and lower positions of the lens, making the abrasive tools close to the upper and lower surfaces of the lens to swing back and forth in the polishing process, producing relative motion and removing the surface materials. In the present invention, in order to eliminate a problem of removal ununiformity, a method for swing machining of abrasive tools and methods for turning over and polishing of workpieces are adopted in a polishing process, which can realize the high efficiency double-sided high-precision machining for a nonplanar lens, and the method can be applied to the double-sided polishing for different types of lenses.

A double-sided polishing method for an optical lens belongs to the technical field of ultra-precision machining. In the double-sided polishing method, upper and lower surfaces of the lens are polished simultaneously by arranging abrasive tools on upper and lower positions of the lens, making the abrasive tools close to the upper and lower surfaces of the lens to swing back and forth in the polishing process, producing relative motion and removing the surface materials. In the present invention, in order to eliminate a problem of removal ununiformity, a method for swing machining of abrasive tools and methods for turning over and polishing of workpieces are adopted in a polishing process, which can realize the high efficiency double-sided high-precision machining for a nonplanar lens, and the method can be applied to the double-sided polishing for different types of lenses.