Polishing tools, polishing systems, and polishing methods

Abstract

The present invention relates to a polishing tool (100) for polishing a spectacle lens (L) by a surface machining process, comprising a tool body (110) rotatably supported about a rotation axis (RA1). The tool body (110) comprises a polishing surface (130) exposed to the outside at a first axial end (101) of the tool body (110). Here, the polishing surface (130) bulges outwardly in a convex or concave manner with respect to the rotation axis (RA1) in order to polish the optical surfaces (L1, L2) of the spectacle lens (L). The tool body (110) further comprises a flow passage (140) extending therein in the axial direction from an inlet (142) to an outlet (141) for supplying an abrasive to the polishing surface (130). The inlet (142) is provided at a second axial end (102) opposite the first axial end (101) with respect to the rotation axis (RA1). The outlet (141) is provided at the first axial end (101). The polishing surface (130) includes at least one groove (150) extending radially from the outlet (141) to the periphery of the polishing surface (130) to distribute abrasive material throughout the polishing surface (130). The present invention also relates to a system (200) and method for polishing an eyeglass lens (L) in a surface machining process using the polishing tool (100).

Description

Technical Field

[0001] The present invention relates to a polishing tool for polishing spectacle lenses by surface machining treatment. The present invention also relates to a system and method using the polishing tool.

Background Art

[0002] The advantage of customized lenses is that the optical power of such lenses can be locally varied to more accurately meet the actual needs of a person regarding visual aids. For example, a person may need lenses to improve near and far vision, while having little or no need for visual correction at intermediate distances. FIG. 2 shows an example of a customized lens (L) having such characteristics. Here, the lens (L) is shown having a front surface (L2) and a specially machined back surface (L1). The contour of the back surface (L1) follows an individually specified power distribution diagram, and different prescription values can be easily applied to different regions of the lens (L). For example, the lower region (L13) consists of a relatively larger amount of material than other regions of the lens (L). This enables a person looking through the lower region (L13) to improve their vision for nearby objects. For reference, a dashed line (L15) is shown in FIG. 2, which shows the contour of the back surface (L1) of a lens without local power variation.

[0003] Generally, there are various manufacturing methods for corrective lenses, such as injection molding, integral molding, machining, etc. Usually, in integral molding, a stock lens in the range of low to medium power is manufactured using a mold. The optical surfaces formed by this process are already polished. In contrast, in machining, lenses calculated individually are formed by a machine called a "lens forming machine". This process requires special surface finishing tools, shaping tools, and polishing tools to form local power variations and high-quality optical surfaces.

[0004] As mentioned earlier, the polishing process is a crucial part of all lens formation processes. Since a rough surface can lead to undesirable effects such as light scattering and specular reflection, the roughness of the lens surface is significantly reduced during this process.

[0005] Figures 5 and 6 typically illustrate representative polishing processes known in the prior art. In these figures, the lens (L) is supported by a lens support (220) comprising a spindle (221) and a lens holder (222). Polishing of the lens (L) is performed using a soft polishing tool (510) and a polishing fluid (521) (often called a “slurry”) supplied from an external nozzle (520). Typically, the polishing fluid (521) consists of a liquid containing polishing particles of a specified particle size. Generally, polishing involves gathering the polishing particles (grains) onto the surface to be polished, sometimes with and sometimes without pressure. This allows the top of the surface roughness to be polished and flattened. The polishing tool (510) rotates around an axis of rotation (indicated by arrow (513)) and is linearly movable (indicated by arrow (512)). Furthermore, the polishing tool (510) is covered with a soft coating film (515) on the surface that contacts the lens (L). During the polishing process, the lens (L) rotates around the rotation axis (RA2) of the spindle (221), and the polishing tool (510) rotates around its own axis, allowing it to tilt or traverse the optical surface (L1) of the lens (L). The polishing process shown in Figure 6 relies on the presence of a polishing solution (521) between the lens surface (L1) and the soft coating film (515). It was also found that the effectiveness, quality control, and thermal control of the polishing process are determined by the film of polishing solution (521) that can be formed between the lens surface (L1) and the soft coating film (515) while having a specified thickness.

[0006] For example, if the film is too thick, the abrasive particles of the polishing solution (521) will not be able to make sufficient contact with the polishing tool (510). This prevents the necessary mechanical interaction between the polishing tool (510) and each particle (and subsequently between each particle and the lens optical surface (L1)). Therefore, the polishing result may be insufficient. On the other hand, if the film is too thin, the surface of the lens (L) and the surface of the polishing tool (510) may come into direct contact with each other, and the rotational energy may be converted into heat rather than surface polishing. However, this may cause damage or deformation to the lens (L) or the polishing tool (510). Also, if the heat is not sufficiently removed from the lens (L) by the polishing solution (521) during the polishing process, the lens (L) may be deformed or damaged due to thermal overload.

[0007] In conventional technology, attempts to address these problems have been made by providing multiple nozzles (520) that spray a large amount of polishing fluid (521) from multiple different directions toward each movable part toward the lens (L) and polishing tool (510), thereby ensuring that a sufficient amount of polishing fluid (521) enters the gap between the lens (L) and the polishing tool (510). Here, the pressure that supplies the polishing fluid (521) from the nozzles (520) is also adjusted to increase the flow rate of the polishing fluid (521) from the nozzles (520). However, these known solutions have disadvantages for various reasons. For example, if the rotational speed of the movable components is high, the distribution of the polishing fluid (521) in the working chamber becomes uncontrollable, making it impossible to control the film thickness. Consequently, a large amount of polishing fluid (521) is required for the polishing process, increasing the maintenance and cleaning time of machines configured in this way. In addition, a large tank and appropriate pump are required to ensure the necessary flow rate and total volume of polishing fluid (521), thus increasing the size of the machine. Furthermore, the polishing fluid (521) needs to be cooled in a cooler before being discharged from the nozzle (520) to ensure sufficient cooling during the polishing process. Typically, the temperature of the polishing fluid (521) is maintained at approximately 14°C. Therefore, the effectiveness, efficiency, and problem-solving capabilities of the polishing process by known prior art solutions are all low. [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, the object of the present invention is to provide polishing tools, polishing systems, and polishing methods that overcome the aforementioned drawbacks of the prior art. In particular, the object of the present invention is to ensure that sufficient polishing fluid is supplied to the area between the lens to be polished and the polishing tool throughout the entire polishing process. Another object of the present invention is to reduce the amount of polishing fluid required for the polishing process while ensuring sufficient cooling during the polishing process to improve the quality that can be achieved in the finished lens.

[0009] These and other objectives will become apparent from reading this specification and are resolved by the subject matter of the independent claims. Dependent claims refer to preferred embodiments of the invention. [Means for solving the problem]

[0010] A first aspect of the present invention relates to a polishing tool for polishing spectacle lenses by surface machining. The polishing tool comprises a tool body rotatably supported about a rotation axis. The tool body comprises a polishing surface exposed outward at its first axial end. The polishing surface bulges out in a convex or concave shape in the axial direction with respect to the rotation axis in order to polish the optical surface of the spectacle lens. The tool body further comprises a flow channel extending axially from end to end within it. The flow channel extends from an inlet to an outlet to supply an abrasive to the polishing surface. The outlet (of the flow channel) is provided at the first axial end. The inlet (of the flow channel) is provided at the second axial end (of the flow channel) opposite to the first axial end with respect to the rotation axis. The polishing surface comprises at least one groove extending radially from the outlet to the periphery of the polishing surface to distribute the abrasive to all parts of the polishing surface.

[0011] In other words, a tool can be provided for use in the process of removing material from the optical surface of an eyeglass lens and smoothing it. The polishing tool comprises a tool body, which is suitable (configured) to be supported so as to rotate about an axis of rotation (e.g., its own axis or an axis offset from itself). The tool body comprises an axial first end and an axial second end opposite to the axial first end with respect to the axis of rotation. At the axial first end, the tool body comprises a polishing surface, such as an outer portion (outer layer) that is accessible from the outside (open to the outside). The polishing surface is suitable for polishing the (typically curved) optical surface of the eyeglass lens and forms a curved shape, for example, a concave or convex shape (with respect to the axis of rotation) that protrudes axially from the tool body. The tool body comprises an (internal) passage for delivering an abrasive (e.g., a liquid, a suspension of a plurality of solids and fluids or pastes) to the polishing surface, the passage extending axially within the tool body (or inside) from an inlet to an outlet. The outlet is provided at the first axial end and is suitable (configured) for discharging the abrasive onto the polishing surface. The polishing surface comprises at least one groove, such as a canal, passage, or depression. The groove extends radially from the outlet to the periphery of the polishing surface (for example, to an edge that encircles or surrounds the polishing surface) to deliver (and / or administer) the abrasive to all parts of the polishing surface. The groove is preferably open outwards and / or open on the side facing the lens surface during polishing.

[0012] By providing an outlet and grooves on the polishing surface and simultaneously making the polishing tool rotatable, uniform distribution of the abrasive to all parts of the polishing surface becomes easier. The abrasive can enter the polishing surface directly from the outlet, where it is propelled by centrifugal force through the grooves to the outer edge of the polishing surface. As a result, the abrasive can be supplied directly to the necessary locations, i.e., the polishing surface, in other words, to the surface of the polishing tool and to all parts of the polishing surface that are effective in smoothing the optical surface of the lens (for example, by initiating mechanical interaction with the optical surface of the lens), thus allowing for more effective and efficient use of the abrasive. For example, the overall slurry displacement can be significantly reduced, resulting in a substantial reduction in energy consumption, abrasive consumption, and wastewater generation. This allows for a significantly smaller design of mechanical components such as pumps, pipes, and tanks. Furthermore, using this polishing tool reduces overall maintenance and cleaning time. In addition, the curved shape of the polishing surface enhances the polishing effect and efficiency of the lens surface.

[0013] Furthermore, a film of abrasive can be reliably formed between the polishing surface and the lens surface to be polished. This not only extends the life of the polishing tool, but also facilitates reliable cooling of the lens surface and the polishing tool with the abrasive, eliminating the need for an additional cooler for the abrasive. What was discovered here was that the inventors had managed to overcome the prejudice of the prior art that the formation of a film of appropriate thickness and high-speed rotation of the polishing tool against the lens would be incompatible because the abrasive would be removed from the polishing surface too quickly by centrifugal force.

[0014] Furthermore, it was found that using this polishing tool improves the quality and results of the polishing process while maintaining a high level of rotational speed. In confidential experiments, it was found that simply providing one or more exits on the polishing surface without the grooves resulted in reduced polishing accuracy and an irregular lens surface. This is typically shown in Figures 7 and 8. In the same confidential experiment, another rotatable polishing tool (610, 620) having a tool body (611, 621) in which the polishing surfaces (615, 625) are exposed outward at the first axial end of the tool body (611, 621) and the polishing surfaces (615, 625) bulge out in a convex or concave shape in the axial direction relative to the rotation axis of the body was used to polish the optical surfaces (L1, L2) of an eyeglass lens (L). The tool body (611, 621) further comprises one or more channels (614, 624) extending axially from one (or more) inlets (612, 622) through the tool body (611, 621) from end to end. The inlets (612, 622) are located at the axial second end opposite to the axial first end with respect to the axis of rotation. The channels (614, 624) extend to one or more outlets (613, 623) located at the axial first end, supplying abrasive (521) to the polishing surface (615, 625). The one or more outlets (613, 623) are uniformly distributed throughout the polishing surface (615, 625) (for example, like a showerhead). For example, Figure 7 shows the configuration of a polishing tool (610) used in the experiment, which has only a single outlet (613) located in the center of the polishing surface (615). Unfortunately, the quality and results of the polishing process in the confidential experiment using such a polishing tool (610) were not satisfactory. This is because, simply providing an opening (613) for the abrasive (521) on the polishing surface (615) causes a localized increase in pressure in the area surrounding the opening (613) during operation. Subsequently, the material around the opening (613) on the polishing surface (615) deforms locally, creating a blind spot on the polishing surface (615) where a free space (FS) or pocket filled with abrasive (521) is formed, rendering it ineffective in the polishing interaction with the lens surface (L1). Figure 8 shows a typical alternative configuration of the polishing tool (620) used in the experiment.What was found here is that even if numerous dispersed openings (623) are provided on the polishing surface (625), this problem cannot be overcome, and in fact, it leads to the formation of numerous free spaces (FS) and pockets. Comparing these experimental, confidential polishing tools (610, 620) with the polishing tools according to the present invention, it is clear that by adding grooves as suggested by the present invention, it is possible to avoid the formation of free spaces and pockets and establish a film of abrasive material of uniform thickness all over the polishing surface, thereby improving the quality and uniformity of the polishing process.

[0015] According to a preferred embodiment, the groove may extend radially along a principal direction of extension. For example, the principal direction of extension may correspond (primarily, i.e., at least 50%, 60%, 70%, 80%, or more) to the direction from the starting point of the groove (e.g., the exit) to the ending point of the groove (a point on the periphery). It is preferable that the groove extends radially throughout in each direction having the same radial orientation. It is more preferable that the groove extends linearly, in a straight line, curved, and / or arched (along the principal direction of extension), and even more preferable that it extends in a wavy or zigzag pattern.

[0016] This makes it possible to adjust the flow rate and distribution of the abrasive to every part of the polishing surface to suit a specific polishing application. Therefore, the thickness of the abrasive film can be adjusted to individual applications such as the lens material, rotation speed, and / or the abrasive used. In this way, the polishing results and polishing efficiency can be further improved.

[0017] In a more preferred embodiment, the groove may include various sections (or sections configured in various ways). For example, the groove may include straight sections, angular sections, arched sections, and / or curved sections.

[0018] In this way, by providing multiple different sections in the groove, the flow velocity of the abrasive can be made different in each section. This allows the design of the abrasive tool to take into account the effects of centrifugal force or other dynamic forces.

[0019] Adjacent sections preferably extend in opposite directions in the circumferential direction. These sections preferably have the same orientation in the radial direction.

[0020] By alternating the extension direction of adjacent sections (only) in the circumferential direction, the flow of the abrasive can be slowed down, thus ensuring a consistent film thickness at all points on the polished surface during operation.

[0021] The adjacent sections are preferably connected to each other by an arched portion, and it is more preferable that this arched portion forms a gentle transition between the adjacent sections. For example, the groove may consist of a straight first section connecting the opening of the flow path to the curved second section, and a third section extending linearly from the second section to the periphery of the polished surface.

[0022] By avoiding sharp edges and corners in the transitional portions between different sections of the groove, the accumulation of solid matter contained in the abrasive (for example, wear particles or worn lens material) can be prevented, thereby reducing the risk of the groove becoming clogged during the polishing process.

[0023] According to a preferred embodiment, the groove may have a width in the range of 0.1 mm to 1.0 mm, or 0.2 mm to 0.8 mm, or 0.4 mm to 0.6 mm, or 0.5 mm. Alternatively or additionally, the groove may have a depth in the range of 0.1 mm to 1.0 mm, or 0.2 mm to 0.8 mm, or 0.4 mm to 0.6 mm, or 0.5 mm.

[0024] By setting the cross-section of the groove part to the above dimensions, it is advantageous for the film thickness of the abrasive between the polishing surface and the lens surface. As a result, the results and quality of the polishing process can be improved.

[0025] According to a more preferred embodiment, the polishing tool may include a plurality of the groove parts. The groove parts preferably spread radially. Alternatively or additionally, the plurality of the groove parts may be (uniformly) distributed around the outlet or the rotation axis. The plurality of the groove parts preferably have the same or at least partially different shapes and / or cross-sections (when viewed along the main extending direction). The cross-section is preferably triangular, rectangular, circular, and / or any other suitable shape. The polishing tool (i.e., one or more of the groove parts) is preferably configured such that when operating, the abrasive is distributed differently according to the rotation direction.

[0026] By providing a large number of groove parts with different orientations and configurations on the polishing surface, the film thickness of the abrasive between the polishing surface and the lens surface can be adjusted, and the polishing tool can be optimized according to specific applications. Therefore, the quality of the polishing process can be improved.

[0027] According to a preferred embodiment, the tool body may be composed of a layered structure and / or may be composed of a plurality of different components that are preferably provided integrally.

[0028] Alternatively or additionally, the plurality of different components (i.e., the base part, the holding part, and the polishing film described below) may be connected to each other by adhesion. For example, the tool body may be composed of one or more (different) parts, such as a base part, a holding part, and / or a polishing film. The (three) parts are preferably arranged in the above order.

[0029] As a result, while maintaining the polishing tool as one device, each part (each layer) of the polishing tool can be composed of a plurality of different materials and have a plurality of different characteristics.

[0030] The tool body preferably comprises an abrasive film that forms its first axial end. More preferably, the abrasive film forms the abrasive surface. The abrasive film may be configured to be in contact with the optical surface of the lens. For example, during the surface machining process, the abrasive tool may press the abrasive film against the lens. Generally, during the surface machining process, the lens and the abrasive tool (having the abrasive film) may be rotated in opposite directions. By pressing the abrasive between the abrasive film and the optical surface of the lens, mechanical wear may occur due to the relative motion between the two surfaces (e.g., lens / abrasive film). The abrasive film preferably comprises the exit and the groove. The abrasive film preferably has a thickness in the range of 0.5 mm to 2.5 mm or 0.8 mm to 2.0 mm, or 1.3 mm. The abrasive film may be provided as a coating film and / or made of a soft material such as plastic, e.g., polyurethane. The abrasive film preferably has a surface hardness in the range of 40 ShA to 90 ShA. Here, the values ​​with the unit "ShA" refer to Shore A hardness testers.

[0031] This makes it possible to impart to the polished surface several properties necessary for polishing lens surfaces, such as flexibility, wear resistance, and low tackiness.

[0032] For example, the abrasive film may correspond to a component of conventional abrasive tools, commonly referred to as a "carrier." However, this is merely an example.

[0033] Alternatively or additionally, the tool body may include a base portion that rotatably supports the abrasive tool. The base portion preferably forms the axial second end and / or provides the entrance. For example, the base portion may be made of a hard material such as metal or hard plastic, such as nylon. The base portion preferably has a tensile strength of 50 MPa to 100 MPa. The base portion more preferably has a thickness of 5 mm to 15 mm (i.e., the portion extending along the axis of rotation).

[0034] The base portion is preferably relatively rigid compared to other parts of the tool body. The base portion may be made of hard plastic or metal.

[0035] This allows the polishing tool to be provided with a rigid base that can be coupled to a motor for operating itself. Furthermore, the polishing tool can be given sufficient rigidity to, for example, apply pressure to the lens surface as needed.

[0036] The tool body preferably further comprises a holding portion. The holding portion can be attached to at least one of the polishing film and the base portion. The holding portion is preferably sandwiched between the polishing film and the base portion. The holding portion may be deformable to conform to the optical surface of the spectacle lens. For example, the holding portion may be made of a soft material such as plastic. For example, the holding portion may be made of polyurethane or a closed-cell rubber material such as neoprene, EPDM (ethylene propylene diene monomer), or NBR (nitrile butadiene rubber). The holding portion preferably has an elastic modulus in the range of 2 MPa to 12 MPa. The holding portion is more preferably 10 mm to 25 mm thick (i.e., the portion extending along the axis of rotation). The holding portion may be relatively flexible compared to the base portion. The holding portion preferably has a layered structure. For example, the holding portion may be made of different materials. Alternatively or additionally, the retaining portion may consist of multiple layers of the same material but with different material compositions (e.g., density, air permeability, pore size).

[0037] This allows the polishing tool to be provided with a barrier layer that prevents the polishing tool from absorbing the abrasive and protects the base from corrosion. Furthermore, by providing the polishing tool with a layer made of a material with a balanced ratio of rigidity and flexibility, the polishing tool can conform to the shape (curvature) of the lens surface while maintaining its ability to apply pressure to the lens surface.

[0038] In a more preferred embodiment, the flow path may extend along the axis of rotation of the polishing tool. Preferably, the flow path is coaxial with the axis of rotation. More preferably, the outlet is at the center of the polishing surface. Alternatively or additionally, (as far as existed) the flow path may penetrate at least one of the polishing film, the base portion, and the retaining portion, preferably each of them. Preferably, the flow path has a diameter in the range of 0.1 mm to 100 mm, preferably in the range of 1.0 mm to 20 mm, most preferably 10 mm. Preferably, the tool body (preferably the base portion, if present) has a port that fluidly connects the flow path to an abrasive supply portion. The port preferably has a gasket that radially seals the abrasive supply portion to prevent leakage of the abrasive and / or to allow the abrasive to enter the flow path only from the inlet. The port may be, for example, a hose fitting or a valve.

[0039] This ensures a sufficient and stable supply of the abrasive to the polishing surface. Furthermore, since the polishing tool can be detachably connected to the polishing device, multiple polishing tools with different configurations can be used in the same polishing device. Therefore, this configuration improves the flexibility and applicability of the polishing tool.

[0040] Another aspect of the present invention relates to a system for polishing at least one optical surface of an eyeglass lens. The system comprises a surface treatment unit for processing the optical surface of the eyeglass lens, wherein the surface treatment unit comprises the polishing tool as described above. The surface treatment unit further comprises a polishing agent supply unit which is fluidly connected to the flow path via the inlet of the polishing tool and supplies an abrasive to the grooves (or a plurality of grooves) of the polishing surface via the flow path and the outlet. The system further comprises a lens support unit which supports the eyeglass lens during the polishing process. The system also comprises a drive unit which enables polishing of the optical surface by causing relative motion between the polishing tool and the lens support unit, at least by rotating the polishing tool about the rotation axis.

[0041] This system possesses all the effects and benefits of the polishing tools described in detail above. Furthermore, using the system described above, highly customized spectacle lenses with individualized power maps (as shown in Figure 2) can be formed and polished with the required precision and quality.

[0042] According to a preferred embodiment, the relative motion may include tilting, rotating, and / or linearly moving the polishing tool relative to the lens support to cause it. Alternatively or additionally, the drive unit may be adjusted to rotate the lens support around a second axis of rotation (e.g., a spindle) to cause the relative motion. Alternatively or additionally, it is preferable that the drive unit be adjusted to displace the polishing tool relative to the lens support to ensure a specified distance between the polishing tool and the lens support (or preferably the spectacle lens (or its optical surface)). The distance is preferably 0.0 micrometers to 0.5 mm. It is more preferable that the magnitude of the distance is determined by (or corresponds to) the size of the particles in the abrasive. However, it is also possible that the drive unit is adjusted to displace the polishing tool relative to the lens support so that there is no gap between the polishing tool and the lens support (or preferably the spectacle lens (or its optical surface)) (i.e., the distance is equal to zero or possibly less). For example, the polishing tool may be brought into contact with or pressurized contact with the lens surface.

[0043] This allows the system to guarantee the thickness of the abrasive film formed between the lens surface and the polishing surface, enabling high-precision and flexible adjustment of the movement of the polishing tool. Furthermore, since there is no need to reduce the speed of each movable system component, the polishing time can be maintained or even shortened while improving the quality of the polishing results. In addition, there is no need to enlarge the pump, piping, or tank to deliver a sufficient amount of abrasive between the polishing tool and the lens surface.

[0044] In another embodiment, the system may further include a control unit for controlling the relative motion by the drive unit. The control unit is preferably suitable for and / or configured to control the relative motion based on processing characteristics. The aforementioned processing characteristics may include, for example, the type of lens to be formed, the shape and / or thickness of the lens, the type of polishing tool, and / or the type of abrasive. Naturally, other processing characteristics may also exist. The control unit is preferably configured to adjust the relative rotational speed between the optical surface and the polishing tool. Alternatively or additionally, the control unit may be configured to adjust the pressure for supplying the abrasive from the polishing tool and / or to adjust the flow rate of the abrasive.

[0045] This allows the thickness of the film between the lens surface and the polishing surface to be precisely adjusted in correlation with the relative position and / or relative movement of the polishing tool relative to the lens surface. Therefore, the polishing process can be completed with high quality without being subject to excessive kinematic constraints.

[0046] The abrasive preferably comprises a fluid (preferably consisting of water and / or a coolant) and solid particles (metal (e.g., aluminum), diamond powder, minerals, silicon, or plastic) having a particle size in the range of 1 to 2 micrometers.

[0047] This allows the lens surface to be smoothed and flattened with high precision, thereby reducing both light scattering and specular reflection as light passes through the lens.

[0048] In a preferred embodiment, the abrasive supply unit may be fluidly connected to the polishing tool via the port (preferably provided on the base portion of the tool body). Here, a predetermined or the gasket may radially seal the abrasive supply unit to prevent leakage of the abrasive and allow the abrasive to enter the flow path only from the inlet. The abrasive supply unit preferably comprises a pump and a tank for supplying the abrasive.

[0049] This allows the polishing tool to be quickly and reliably connected to and removed from the surface treatment area, thereby enabling high processing times.

[0050] Another aspect of the present invention relates to a method for polishing the optical surface of an eyeglass lens. This method includes the step of providing a surface treatment system having a polishing tool as described above. Alternatively or additionally, this method includes the step of providing the system as described above. The eyeglass lens is mounted on the lens support of the system (any of the systems described above). The polishing tool is rotated relative to the eyeglass lens. The abrasive is delivered through the channel (of the polishing tool) to the polishing surface (of the polishing tool) facing the optical surface of the eyeglass lens to be polished, so that the abrasive is delivered radially outward from the outlet (of the polishing tool) through the groove to distribute the abrasive to all parts of the polishing surface in order to polish the optical surface.

[0051] The method preferably further includes the step of controlling (using the control unit) the thickness of the abrasive layer between the optical surface and the polishing surface by adjusting one or more processing parameters. The processing parameters may be the flow rate or supply pressure of the abrasive. The processing parameters preferably (additionally) are one or more of the distance between the polishing surface and the optical surface, the rotational speeds of the lens and the polishing tool, and / or the translational speed of the polishing tool relative to the lens. The processing parameters may be adjusted based on the rotational speed of either or both of the polishing tool and the spectacle lens.

[0052] According to the method with this configuration, it is possible to realize all the effects and benefits described in detail above. Furthermore, it is possible to improve the quality and precision of the lens formed by the polishing process.

[0053] Another aspect of the present invention relates to the use of the above-described polishing tool for polishing the optical surface of an eyeglass lens using an abrasive. The eyeglass lens is preferably a progressive lens. [Brief explanation of the drawing]

[0054] Further features, effects, and objectives of the present invention will become apparent to those skilled in the art as they read the detailed description of each embodiment of the present invention below and in conjunction with the accompanying drawings. Even if reference numerals are omitted from the drawings for reasons such as clarity, the corresponding features may still be present in the drawings. [Figure 1] The front and side views of the lens are shown in a schematic manner. [Figure 2] A schematic side view of the individually specified lens at the end of the surface machining process is shown. [Figure 3] This diagram schematically shows a side view of the lens fixed to the lens support at the start of the surface machining process. [Figure 4] This diagram schematically shows a side view of a lens that is fixed to a lens support and individually customized during surface machining. [Figure 5] This diagram schematically shows a side view of a custom-made lens that is fixed to a lens support using conventional surface machining technology and undergoing polishing. [Figure 6] This diagram schematically shows a side view of a custom-made lens that is fixed to a lens support using conventional surface machining technology and undergoing polishing. [Figure 7] This diagram schematically shows a side view of an experimental apparatus for inspecting polishing tools used to polish lenses that are fixed to a lens support and customized for individual use. [Figure 8]This diagram schematically shows a side view of an experimental apparatus for inspecting polishing tools used to polish lenses that are fixed to a lens support and customized for individual use. [Figure 9] This is a schematic cross-sectional view of one embodiment of a polishing tool according to the present invention. [Figure 10] This is a schematic front view of one embodiment of a polishing tool according to the present invention. [Figure 11] Figure 9 is a schematic diagram of one embodiment of the system according to the present invention, equipped with the polishing tool shown. [Modes for carrying out the invention]

[0055] Figure 1 shows a typical example of the contour of lens L before the start of surface machining. Figure 2 shows an example of a customized lens L at the end of surface machining. Figures 3 and 4 show various steps of the lens formation process. Figures 5 and 6 highlight known problems in the prior art. Figures 7 and 8 show experimental apparatus for identifying problems in the polishing process, respectively. Figures 9-11 show different diagrams and aspects of each embodiment of the present invention.

[0056] For example, a first aspect of the present invention relates to a polishing tool 100 for polishing spectacle lenses L in a surface machining process. Typical embodiments of the polishing tool 100 are shown in Figures 7 to 9.

[0057] Generally, a “lens” can be understood as any transmissive optical element that is tuned to change the path of light by refraction. For example, lens L could be an ophthalmic lens such as a corrective or prescription lens. Figures 1 and 2 show examples of lens L. Lens L may have two opposing optical (side) surfaces L1, L2 and a periphery L3. The optical (side) surfaces L1 and L2 may be convex and / or concave. Typically, lens L can be made of a transparent and / or translucent material, such as a plastic material for spectacle lenses, such as polycarbonate, or glass.

[0058] In surface machining, typically only one of the two optical surfaces L1 and L2 is machined, and the other of the two sides L1 and L2 of the lens L may be supported by the lens support 220. This is typically shown in Figures 3-6 and 11. Of course, surface machining can process one or both of the two sides L1 and L2 of the lens L.

[0059] Surface machining can begin by selecting a lens blank in which the front surface L2, most suitable for vision enhancement applications, can be left intact, such as the lens L typically shown in Figure 1. In contrast, the back surface L1 of the lens blank L can be processed to form a customized (progressive) lens L, as typically shown in Figure 2.

[0060] Surface machining processes typically include, for example, any surface finishing or manufacturing steps that form an optical element, such as cribbing (i.e., reducing the outer diameter of the lens blank L in a milling process), roughing (i.e., grinding one of the optical surfaces L1, L2 to an approximate curvature and thickness), smoothing (i.e., grinding one of the optical surfaces L1, L2 to an accurate curvature and thickness), chamfering (i.e., cutting the lens L to the shape of the spectacle frame), and polishing (i.e., smoothing the lens L so that it transmits light properly and reduces specular reflection). However, these are merely examples and not a complete list.

[0061] The polishing tool 100 is suitable (and configured) for use in, for example, such surface machining processes. Furthermore, since the polishing tool 100 is suitable (and configured) for polishing eyeglass lenses, as a result, the polishing tool 100 may be suitable for following the curvature typically present in eyeglass lenses or for processing the common materials used in eyeglass lenses.

[0062] The grinding tool 100 comprises a tool body 110 that is rotatably supported around a rotation axis RA1, as is typically shown in Figures 9 and 11. The rotation axis RA1 may be the main axis or axis of symmetry of the tool body 110, and / or an axis offset from the grinding tool 110.

[0063] The tool body 110 comprises an axial first end 101 and an axial second end 102 located on the opposite side of the axial first end 101 from the rotation axis RA1. Preferably, the tool body 110 extends (continuously) along (and with) the rotation axis RA1 from the axial first end 101 to the axial second end 102. Figures 9 and 11 typically illustrate this. The tool body 110 may have any shape or form, such as a cylindrical shape. For example, the tool body 110 may be coaxial with the rotation axis RA1.

[0064] The tool body 110 may consist of, for example, a layered structure and / or a continuous structure. Figures 9 and 11 typically show the tool body 110 as being composed of multiple different layers. The tool body 110 may consist of any number of layers. Each layer may be joined to one another by an adhesive such as glue, or by mechanical connections such as screws. However, these are merely examples and not a complete list.

[0065] The tool body 110 has an outwardly exposed polishing surface 130 at its axial first end 101. Figure 11 typically illustrates how the outwardly exposed polishing surface 130 facilitates interaction between the polishing tool 100 and the lens surface L1. The polishing surface 130 bulges outwards in an axial direction convex or concave manner with respect to the rotation axis RA1 in order to polish the optical surfaces L1 and L2 of the lens L. For example, depending on the type of lens L, such as a converging or diverging lens, the polishing surface 130 may have a curved (rounded) shape that protrudes outwards (convex) or recedes inwards (concave). Figures 9 and 11 show a typical configuration in which the polishing surface 130 bulges outwards in an axial direction convex with respect to the rotation axis RA1. It is preferable that the polishing surface 130 bulges outwards so that it has a curvature equal to or greater than that of the optical surfaces L1 and L2. It is more preferable that the size of the polishing surface 130 is smaller than that of the optical surfaces L1 and L2 of the lens L. For example, the polishing surface 130 may cover 1 / 50, 1 / 20, 1 / 10, 1 / 8, 1 / 5, or 1 / 4 of the (entire) area of ​​the optical surfaces L1 and L2. The polishing surface 130 may form the (axial) end face of the polishing tool 100. Furthermore, the polishing surface 130 may be oriented away from the axial second end 102. The polishing surface 130 may have any shape or form. For example, the polishing surface 130 may be circular or elliptical when viewed along the rotation axis RA1. However, these are merely examples and not a complete list.

[0066] The polishing surface 130 is preferably formed by a polishing film 113 of the tool body 110. The polishing film 113 may form the axial first end 101. The polishing film 113 may be one of several layers of the tool body 110. For example, the polishing film 113 may be made of a soft material so as not to damage the optical surfaces L1 and L2 of the lens L during the polishing process. For example, the polishing film 113 may be made of polyurethane. Of course, other materials can also be used to form the polishing film 113. The polishing film 113 may be supplied as a coating or film. The polishing film 113 is preferably in the range of 0.5 mm to 2.5 mm or 0.8 mm to 2.0 mm, or 1.3 mm in thickness. The polishing film 113 may have protruding edges 133 that project radially from the tool body 110, as typically shown in Figure 9. This prevents excessive force from being applied from the optical surface L1 when penetrating it during the polishing process.

[0067] The axial second end 102 of the tool body 110 is preferably formed by a base portion 111. The base portion 111 may be one of several layers of the tool body 110. The base portion 111 may be suitable (or configured) for rotatably supporting the polishing tool 100, for example, in the tool holder of a lens forming machine for surface machining. This is typically shown in the schematic diagram of Figure 11. For this reason, the base portion 111 may preferably be made of a hard material, such as metal, or a hard plastic such as nylon. However, this is just an example, and other materials may be used.

[0068] The tool body 110 preferably also includes a retaining portion 112 which can be positioned between the abrasive film 113 and the base portion 111. The retaining portion 112 may be one of several layers of the tool body 110. The retaining portion 112 may be oriented axially to match the outer shape of the optical surfaces L1 and L2 of the lens L. For this reason, the retaining portion 112 may be configured to be reversibly deformable under pressure. For example, the retaining portion 112 may be made of plastic, such as neoprene, EPDM, or closed-cell rubber material such as NBR.

[0069] The tool body 110 further comprises a flow channel 140 extending axially (along or coaxially with the rotation axis RA1) from end to end. Here, the flow channel 140 may penetrate the abrasive film 113, the base portion 111, and the holding portion 112, respectively, as typically shown in Figures 9 and 11. The flow channel 140 may have a diameter that is constant, or increases / decreases in a stepwise or continuous manner along its direction of extension. The flow channel 140 preferably has a cross-section of any shape or form, for example, a circular or rectangular cross-section. The flow channel 140 may be formed by passages formed within each part of the tool body 110, or by providing tubes or hoses that extend through these passages. However, these are merely examples and not a complete list.

[0070] The flow path 140 preferably includes an inlet 142 for supplying abrasive material to the flow path 140. This is typically shown in Figures 9 and 11. The inlet 142 is provided at the axial second end 102. The base portion 111 preferably includes the inlet 142. The inlet 142 is more preferably formed as an opening in, for example, the tool body 110 or the base portion 111. The inlet 142 may have the same or a different cross-sectional shape as the flow path 140. The flow path 140 may expand radially toward or at the inlet 142. This is typically shown in Figures 9 and 11.

[0071] The tool body 110 (or base 111) may further include a port 143 for fluid connection of the flow path 140 to the abrasive supply unit 240 (as shown in Figure 11). This is typically shown in Figures 9 and 11. The port 143 may be a valve, hose fitting, pipe, or hose. Preferably, the port 143 is the same size as the inlet 142. More preferably, the port 143 is removably connected to the inlet 142. The port 143 may be press-fitted into the inlet 142. Preferably, the port 143 includes a gasket 144 that radially seals the abrasive supply unit 240 (see Figure 11) to prevent leakage of abrasive and allow abrasive to enter the flow path 140 only from the inlet 142. This is typically shown in Figures 9 and 11. The gasket 144 may be made of rubber and / or an O-ring. However, these are just examples and not a complete list.

[0072] The flow path 140 further comprises (preferably a single) outlet 141 that supplies abrasive material (preferably supplied from the inlet 142) to the polishing surface 130. The outlet 141 is located at the axial first end 101. The outlet 141 is preferably located at the center of the polishing surface 130 (as typically shown in Figures 9-11). The outlet 141 is preferably coaxial with the rotation axis RA1. However, the outlet 141 may be located at a different position. For example, the outlet 141 may be located in the immediate vicinity (e.g., radius < 10 mm) of the rotation axis RA1 (or the center of the polishing surface 130). The polishing film 113 is preferably provided with the outlet 141, as typically shown in Figures 9-11. The outlet 141 may have any shape or form. For example, the outlet 141 may be circular and / or its diameter may increase or decrease toward the axial first end 101. The outlet 141 is preferably formed as a nozzle or throttle (and provides the same function). The outlet 141 may have a diameter that is significantly smaller than the diameter of the polishing surface 130 (as demarcated by its outer circumference), i.e., a diameter of 1 / 100, 1 / 80, 1 / 50, 1 / 20, 1 / 10, 1 / 8, or 1 / 5 of the diameter of the polishing surface 130.

[0073] The abrasive may be, for example, a mixture of a liquid and solid particles. The liquid may consist of water and / or a coolant. The solid particles may be made of metal (e.g., aluminum oxide), silicon, or plastic. The solid particles preferably have a particle size in the range of 1 to 2 micrometers.

[0074] The polishing surface 130 has at least one groove 150. It is preferable that the polishing film 113 has a groove 150. Figures 9 to 11 typically illustrate this.

[0075] As typically shown in Figure 10, the polished surface 130 may have multiple grooves 150 (i.e., two or more grooves 150). Whenever “grooves 150” are mentioned in the following description, unless otherwise specified, the description applies to “multiple grooves 150.” The grooves 150 may have the same or different configurations. For example, each groove 150 may be identical or have at least partially different shapes and / or cross-sections.

[0076] The grooves 150 extend radially from the outlet 141 to the periphery of the polishing surface 130, distributing the abrasive material to all parts of the polishing surface 130. The grooves 150 can have any shape or form. For example, the grooves 150 may extend radially along the main direction of extension. Here, the grooves 150 may extend such that their path does not return radially towards the outlet 141 (rather, the grooves 150 continue to extend radially outward). The grooves 150 may extend linearly, in a straight line, curved, and / or arched.

[0077] Alternatively or additionally, as typically shown in Figure 10, the groove 150 may extend in a wavy or zigzag pattern. Here, the groove 150 may include several different sections. These different sections may be connected to each other to form a continuous flow path for the abrasive. Adjacent sections are preferably connected to each other by arched portions. The connecting portions, for example, arched portions, more preferably form a gentle transition between each adjacent section. This allows for continuous flow within the groove 150 and helps avoid clogging. Each section (one of the different sections) is preferably straight, angular, arched, and / or curved. Adjacent sections may extend circumferentially in opposite directions. Examples of different sections are shown in Figure 10, where the groove 150 is typically shown to include a straight first section 151 that connects the exit 141 to a curved second section 152, and a third section 153 that extends linearly from the curved second section 152 to the outer edge of the polished surface 130 (polished film 113). It is also conceivable that the groove 150 may have multiple branches and / or branch into other (adjacent) (multiple) groove sections 150.

[0078] The groove 150 may have a circular or rectangular cross-section when viewed along the main extension direction and / or along the flow direction. The groove 150 preferably has a width W in the range of 0.1 mm to 1.0 mm, or 0.2 mm to 0.8 mm, or 0.4 mm to 0.6 mm, or 0.5 mm (see Figure 10). Alternatively or additionally, the groove 150 may have a depth T in the range of 0.1 mm to 1.0 mm, or 0.2 mm to 0.8 mm, or 0.4 mm to 0.6 mm, or 0.5 mm (see Figure 9).

[0079] It is preferable to provide multiple different grooves 150 so as to spread radially on the polishing surface 130. Alternatively or additionally, the multiple grooves 150 may be distributed (uniformly) around the exit 141 (or rotation axis RA1). For example, based on the arrangement and / or configuration of the grooves 150 (e.g., circumferential orientation, multiple curved sections, etc.), the polishing tool 100 may only be used in one rotational direction around the rotation axis RA1 in order to operate properly.

[0080] Another aspect of the present invention relates to a system 200 for polishing at least one of the optical surfaces L1, L2 of an eyeglass lens L. Figure 11 shows this typically.

[0081] The system 200 includes a surface treatment unit 210 for processing the optical surfaces L1 and L2 of the spectacle lens L. Here, the surface treatment unit 210 includes the polishing tool 100 described above. For example, the surface treatment unit 210 may also include a linearly movable cutter 400 (as indicated by arrows 410 and 420), as is typically shown in Figure 4.

[0082] The surface treatment unit 210 further includes an abrasive supply unit 240 to supply abrasive to the polishing surface 130. The abrasive supply unit 240 is fluidly connected to the flow path 140 via the inlet 142 of the polishing tool 100 (through port 143) and supplies abrasive from the outlet 141 to the (multiple) grooves 150. The gasket 144 described above preferably seals the connection radially to prevent leakage of abrasive and to allow abrasive to enter the flow path 140 only from the inlet 142. Therefore, for example, abrasive can be injected by the pump 241 of the abrasive supply unit 240 from the volume tank 242 of the abrasive supply unit 240 through the pipe 213 to the port 143 and then to the inlet 142. The abrasive can flow from the inlet 142 through the flow path 140 to the outlet 141 and then to the (multiple) grooves 150. For example, when the polishing tool 100 is rotated around the rotation axis RA1, the abrasive is pushed radially outward toward the outer edge of the polishing surface 130. Simultaneously, the circumferential force displaces the abrasive from the multiple grooves 150, so that the abrasive is distributed to every part of the polishing surface 130 (the whole). If the configuration of each section of the multiple grooves 150 is different, the abrasive may flow at different speeds. Specifically, the gradual transition between adjacent sections can help reduce the flow velocity of the abrasive flowing through the part of the groove 150 that is further radially away from the outlet 141. This can reduce the effect of centrifugal acceleration.

[0083] The system 200 further comprises a lens support section 220 (as described above in relation to Figures 3-6) for supporting the lens L during the polishing process. For this purpose, the lens support section 220 may include a lens holder 222 capable of applying suction force to the lens L. The lens support section 220 may also include a spindle 221 that rotates around a second rotation axis RA2 (indicated by arrow 223). Figures 3-6 and 11 typically illustrate this.

[0084] The system 200 also includes a drive unit that causes relative motion between the polishing tool 100 and the lens support 220. Here, the aforementioned relative motion includes at least rotating the polishing tool 100 around the rotation axis RA1, making it easier to polish the optical surfaces L1 and L2 with the polishing tool 100. This is typically shown by arrow 213 in Figure 11. The aforementioned relative motion may also include tilting, pivoting, and / or linearly moving the polishing tool 100 relative to the lens support 220 (as shown by arrows 211 and 212 in Figure 11). Preferably, the drive unit is adjusted to displace the polishing tool 100 relative to the lens support 220, ensuring a specified distance between them.

[0085] The drive unit may include and / or drive the spindle 221. Here, it is preferable that the drive unit is adjusted to rotate the lens support 220 around the second rotation axis RA2 to produce (additional) relative motion (e.g., arrow 223). The drive unit may be part of the surface treatment unit 210, or vice versa. Figure 11 shows this typically.

[0086] The system 200 may further include a control unit 230 for controlling the relative motion by the drive unit and / or surface processing unit 210. The control unit 230 may control the system 200 based on processing characteristics such as the type, shape and thickness of the lens, the type of polishing tool, and the type of abrasive. Here, the control unit 230 is preferably configured to adjust the relative rotational speed between the optical surfaces L1, L2 and the polishing tool 100. Alternatively or additionally, the control unit 230 may be configured to adjust the pressure for supplying the abrasive to the polishing tool 100 and / or the flow rate of the abrasive (through the flow path 140).

[0087] Another aspect of the present invention relates to a process for polishing at least one of the optical surfaces L1 and L2 of an (eyeglass) lens L. In this process, the above-described system 200 is provided. Alternatively, another surface treatment system comprising the above-described polishing tool 100 could be provided.

[0088] The (spectacled) lens L is fixed to the aforementioned (or predetermined) lens support 220. The polishing tool 100 rotates relative to the lens L. The polishing agent is supplied through the flow path 140 to the polishing surface 130 facing the optical surfaces L1 and L2 of the lens L to be polished. For example, through rotation, the polishing agent is delivered radially outward from the outlet 141 through a plurality of grooves 150 so that the polishing agent is distributed to all parts of the polishing surface 130 to polish the optical surfaces L1 and L2.

[0089] For example, in surface finishing processes, the lens L and the polishing tool 100 (having a polishing film 113) can typically be rotated relative to each other in opposite directions. By supplying the abrasive from the flow path 140 into a plurality of grooves 150, the abrasive can be transferred (squeezed out) between the polishing surface 130 (polishing film 113) and the optical surfaces L1 and L2 of the lens L. This causes the abrasive particles contained in the abrasive to move due to the relative motion between the two surfaces (e.g., the optical surfaces L1 and L2 and the polishing surface 130), thus performing mechanical polishing. For example, providing a plurality of grooves 150 all over the polishing surface 130 can be advantageous because it allows for uniform distribution of the abrasive. In general, by guiding / delivering the abrasive through a plurality of grooves 150 (pathways), the degree of influence of the abrasive on circumferential and radial acceleration (depending on the position of the pathway within the grooves 150) can be controlled. This makes it possible to control how the abrasive moves to all parts of the polishing surface 130 (i.e., when and where it moves with respect to being distributed from the outlet 141), thereby improving the distribution of the abrasive to all parts of the polishing surface 130.

[0090] This process may further include the step of controlling the thickness of the abrasive layer (film) between the optical surfaces L1, L2 and the polishing surface 130 by adjusting the flow rate and / or supply pressure of the abrasive based on the rotational speed of the polishing tool 100 and / or the spectacle lens L. However, other parameters such as the desired smoothness of the lens L, or the uniformity and composition of the abrasive may also be considered (additionally).

[0091] The present invention is not limited to the embodiments described above, as far as can be concerned with the appended claims. All features of the embodiments described above can be combined and provided interchangeably in any possible way.

[0092] For example, the tool body 110 may have multiple flow channels 140 extending from end to end within it. Each of the multiple flow channels 140 may have one or more inlets 142 connected to one or more outlets 141. For example, each of the multiple flow channels 140 may correspond to one inlet 142 and one outlet 141. However, each of the multiple flow channels 140 may extend between the same inlet 142 and a plurality of outlets 141 that may be provided on the polishing surface 130. Each of the plurality of outlets 141 may have one or more grooves 150 extending radially from there to the periphery of the polishing surface 130, thereby distributing the abrasive material to all parts of the polishing surface 130. For example, the plurality of outlets 141 may be uniformly distributed throughout the polishing surface 130. For example, additional outlets 141 and additional grooves 150 (not shown) may be provided in the gaps (larger gaps) between the grooves 150 typically shown in Figure 10.

Claims

1. A polishing tool (100) for polishing eyeglass lenses (L) by surface machining, wherein the polishing tool comprises a tool body (110) that is rotatably supported around a rotation axis (RA1), The tool body (110) is provided with a polishing surface (130) that is exposed outward at its axial first end (101), and the polishing surface (130) bulges out in a convex or concave shape in the axial direction with respect to the rotation axis (RA1) in order to polish the optical surfaces (L1, L2) of the spectacle lens (L). The tool body (110) is provided with a flow path (140) that extends axially from an inlet (142) located at the axial second end (102) opposite to the axial first end (101) with respect to the rotation axis (RA1) to an outlet (141) located at the axial first end (101), thereby supplying abrasive material to the polishing surface (130). The polishing surface (130) is provided with at least one groove (150) that extends radially from the outlet (141) to the peripheral edge of the polishing surface (130), thereby distributing the abrasive material to all parts of the polishing surface (130). The exit (141) is the starting point of the groove (150) toward the peripheral edge. A polishing tool (100) characterized by the following.

2. The groove (150) extends radially along the main extending direction, linearly, in a straight line, curved, and / or arched, or wavy or zigzag. The polishing tool (100) according to claim 1, characterized in that it is a polishing tool (100).

3. The groove (150) includes a straight section, an angular section, an arched section, and / or a curved section. Adjacent sections extend in opposite directions in the circumferential direction. The adjacent sections are connected to each other by an arch-shaped portion, and the arch-shaped portion forms a gentle transition between the adjacent sections. The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

4. The groove (150) has a width (W) in the range of 0.1 mm to 1.0 mm, or 0.2 mm to 0.8 mm, or 0.4 mm to 0.6 mm, and / or The groove (150) has a depth (T) in the range of 0.1 mm to 1.0 mm, 0.2 mm to 0.8 mm, 0.4 mm to 0.6 mm, or 0.5 mm. The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

5. The polishing tool (100) is equipped with a plurality of grooves (150), The groove portion (150) extends radially and / or is uniformly distributed around the outlet (141) or the rotation axis (RA1). The groove (150) has the same or at least partially different shape and / or cross-section. The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

6. The tool body (110) is equipped with an abrasive film (113) that forms its axial first end (101), The abrasive film (113) is provided with the outlet (141) and the groove (150), The abrasive film (113) has a thickness in the range of 0.5 mm to 2.5 mm or 0.8 mm to 2.0 mm, or 1.3 mm. The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

7. The tool body (110) includes a base portion (111) that rotatably supports the polishing tool (100), The base portion (111) includes an inlet (142). The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

8. The flow path (140) extends along the rotation axis (RA1) of the polishing tool (100). The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

9. The tool body (110) is provided with a port (143) that fluidly connects the flow path (140) to the abrasive supply unit (240), The port (143) is equipped with a gasket (144) that radially seals the abrasive supply unit (240) to prevent leakage of the abrasive and to allow the abrasive to enter the flow path (140) only from the inlet (142). The polishing tool (100) according to claim 1 or 2, characterized in that it is a polishing tool (100).

10. A system (200) for polishing at least one optical surface (L1, L2) of an eyeglass lens (L), comprising a surface treatment section (210), a lens support section (220), and a drive section, The surface treatment unit (210) is for treating the optical surfaces (L1, L2) of the spectacle lens (L), and comprises the polishing tool (100) described in claim 1 or 2, and a polishing agent supply unit (240) which is fluidly connected to the flow path (140) via the inlet (142) of the polishing tool (100), and supplies polishing agent to the grooves (150) or a plurality of grooves (150) of the polishing surface (130) via the flow path (140) and the outlet (141), The lens support portion (220) is for supporting the spectacle lens (L) during the polishing process, The drive unit at least rotates the polishing tool (100) around the rotation axis (RA1), thereby causing relative motion between the polishing tool (100) and the lens support (220), enabling the polishing of the optical surfaces (L1, L2). A system (200) characterized by the following.

11. The relative motion includes tilting, rotating, and / or linearly moving the polishing tool (100) relative to the lens support (220) in order to perform the motion. The drive unit is adjusted to rotate the lens support (220) around the second rotation axis (RA2) to cause the relative motion, and / or, The drive unit is adjusted to displace the polishing tool (100) relative to the lens support (220) to ensure a specified distance between the polishing tool (100) and the lens support (220). The system (200) according to claim 10, characterized in that

12. The system further comprises a control unit (230) for controlling the relative motion by the drive unit based on processing characteristics such as the type of the spectacle lens (L), the shape and thickness of the spectacle lens (L), the type of the polishing tool (100), and the type of polishing agent. The control unit (230) is configured to adjust the relative rotational speed between the optical surfaces (L1, L2) and the polishing tool (100), and / or the pressure for supplying the abrasive to the polishing tool (100), and / or the flow rate of the abrasive. The system (200) according to claim 10, characterized in that

13. The abrasive supply unit (240) is fluidly connected to the polishing tool (100) via the port (143) of the tool body (110). The gasket (144) of the port (143) radially seals the abrasive supply section (240) to prevent leakage of the abrasive and to allow the abrasive to enter the flow path (140) only from the inlet (142). The system (200) according to claim 10, characterized in that

14. A method for polishing the optical surfaces (L1, L2) of an eyeglass lens (L), To provide the system (200) described in claim 10, The eyeglass lens (L) is mounted on the lens support part (220) of the system (200), The polishing tool (100) is rotated relative to the spectacle lens (L), The abrasive is delivered radially outward from the outlet (141) through the groove (150), and the abrasive is delivered through the flow path (140) to the polishing surface (130) facing the optical surfaces (L1, L2) of the spectacle lens (L) to be polished, so that the abrasive is distributed to all parts of the polishing surface (130) in order to polish the optical surfaces (L1, L2). A method characterized by the following:

15. The further includes controlling the thickness of the abrasive layer between the optical surfaces (L1, L2) and the polishing surface (130) by adjusting the flow rate and / or supply pressure of the abrasive based on the rotational speed of the polishing tool (100) and / or the spectacle lens (L). The method according to claim 14, characterized in that

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