Abstract: A method for producing a semi-finished product for a plus or minus power lens having a toroidal or atoroidal back that is configured as a prescription surface. According to the method, a blank having a diameter DR and a front having a radius of curvature rV is fixed on its front for the purpose of machining the back and is subjected to cutting, the prescription surface being produced only across a part of the diameter D.

Abstract: A method for producing an element having at least one arbitrarily freely formed surface (freeform surface) having a high accuracy of form and a low surface roughness. The freeform surface is obtained by at least one first processing step with a shaping material processing method in which at least an approximation to the desired freeform surface (target form) is effected, and at least one second step with a material processing method that smooths the surface, wherein at least during the second processing step of the smoothing material processing, the element (1) to be processed is elastically stressed by force introduction such that the freeform surface to be smoothed is processed by smoothing processes for spherical, plane or aspherical surfaces.

Abstract: While having a milling cutter, equipped with a rotary shaft and a blade portion projecting in the direction intersecting with the axial line direction of the rotary shaft, rotated about the axial line of said rotary shaft, the milling cutter and the base material for forming an optical device are relatively moved in the cutting-in direction and the feed direction to form machining faces that constitute the device face. At the boundary part of the machining faces, the rotary shaft is directed in the direction orthogonal to the boundary part to cut the lower machining face of two adjacent machining faces. The objective is to provide a method for manufacturing an optical device in which a step can be formed at the boundary part between two adjacent machining faces when manufacturing an optical device or a mold by cutting, and to provide an optical device.

Abstract: An automatic suction device for an eyeglass lens and a method for determining suction jig installation position, capable of recognizing that a frame exchange lens holder is being installed on a placement table, making transition to installation work of a frame exchange mode, and avoiding an erroneous contact between the frame exchange frame and a lens holding frame. The kind of holding means placed on the placement table is determined from an image of the inside of an opening (141), which image is taken by a CCD camera (105), and the installation position of a suction jig (121) at an eyeglass lens (L) placed on a frame exchange lens holder (300) is obtained.

Abstract: A method of working the periphery of an ophthalmic lens (L), the periphery of the lens possessing an edge face (C) and the method including edging the edge face of the lens by machining with a first grindwheel (31) mounted to rotate about an axis of rotation (A4). According to the invention, during the edging, in addition to being free to rotate about the axis of rotation, the first grindwheel possesses two degrees of freedom to move in tilting about two distinct pivot directions that are substantially transverse to its axis of rotation.

Abstract: An eyeglass lens processing apparatus includes a lens holding unit for holding an eyeglass lens, a roughing tool, a finishing tool, a drilling tool, a processing water supply unit for applying processing water to a processed part of the lens held by the lens holding unit, and a controller for controlling driving operations of each of the processing tools and the processing water supply unit in order to execute roughing for the lens by the roughing tool without application of the processing water, drilling for the lens by the drilling tool without the application of the processing water after the roughing and finishing for the lens by the finishing tool with the application of the processing water after the drilling.

Abstract: The invention concerns a method for producing ophthalmic lenses that uses plastic blanks in the form of flat, round discs. The outer edge of said plastic blanks is clamped and the desired final surface geometry and surface quality of the front faces of the lens are subsequently produced by a machining process using grinders and/or lathes and by smoothing and polishing processes. During machining, a thicker annular region is retained on the outer circumference of the workpiece. The annular region clamps or arranges the workpiece during machining and transport operations and stabilizes the lens for additional machining. Shaped pieces for identifying the machining axes are attached to the annular region. The lens is provided with fine markings to characterize the lens that has been produced, with the lens then being separated from the region.

Abstract: A method and a device for treating grinding water of a lens grinding device are provided, in which grinding water is circulated via a grinding water tank, a filtering device, a lens grinding device main body by a pump, and an amount of grinding chips in a circulation cycle of the grinding water is detected based on a water level of the grinding water tank.

Abstract: Disclosed is an automatic constant pressure polishing apparatus. The automatic constant pressure polishing apparatus comprises a housing having a hollow section therein, a rubber pad installed in the housing and having superior expansion and contraction characteristics, a pressure fixture having a male screw section, which is formed on an outer peripheral surface thereof in order to press and fix the rubber pad, and a central hole formed at a central portion thereof, a slider screw-coupled into the housing to adjust pressure in the housing according to a rotational degree of the rotating shaft, and a polishing pad installed at a front end portion of the housing.

Abstract: A polishing head for polishing machines, in particular for polishing optical surfaces, has a polishing plate that is connected to a rotationally drivable drive shaft. The polishing plate is articulated to, and rotates with, the drive shaft. A ball hexagonal socket joint provides the articulated connection. Rotating by means of the articulated connection, the polishing plate can follow the surface of the workpiece to be processed, so that the polishing covering on the polishing plate always rests on a maximally large area on the surface of the workpiece.

Abstract: A method of manufacturing an optical component comprising a substrate and a mounting frame with plural contact portions disposed at predetermined distances from each other is provided. The method comprises providing a measuring frame separate from the mounting frame for mounting the substrate, which measuring frame comprises a number of contact portions equal to a number of the contact portions of the mounting frame, wherein respective distances between the contact portions of the measuring frame are substantially equal to the corresponding distances between those of the mounting frame, measuring a shape of the optical surface of the substrate, while the substrate is mounted on the measuring frame, and mounting the substrate on the mounting frame such that the contact portions of the mounting frame are attached to the substrate at regions which are substantially the same as contact regions at which the substrate was attached to the measuring frame.

Abstract: This apparatus includes a unit for adhering an elastic seal to a lens holder, a unit for causing the lens holder, to which the elastic seal is adhered, to hold a lens, a pivotal arm, an arm driving unit for pivoting the pivotal arm, a clamp unit attached to the pivotal arm to be vertically movable to hold the lens holder, and a clamp driving unit for vertically moving the clamp unit. The pivotal arm is pivoted to sequentially adhere the elastic seal to the lens holder and hold the lens by the lens holder.

Abstract: The method comprises the following steps: a centering step during which the optical frame of reference of the lens is acquired and a blocking accessory is fastened thereto; and a step of shaping the lens to have a desired outline. The blocking accessory is fitted with an electronic identification element bearing an identification code, and said identification code of the electronic element is read initially during a first read during the centering step to associate the code in memory with the mounting parameters of the lens that is receiving the blocking accessory, and then during a second read during the shaping step in order to recover the mounting parameters associated with the identification code as read and thus with the lens attached to the blocking accessory.

Abstract: An apparatus for polishing an optical surface, in particular an optical surface of a spectacle lens, is disclosed. The apparatus comprises a polishing head having a polishing tool, the polishing tool being provided along a common axis, one behind another, with a first preferably rigid member, a second elastic member, and a polishing lining, each extending essentially radially relative to the axis. The second elastic member is configured to be increasingly soft in a radial outward direction. Moreover, a method of polishing an optical surface, in particular a surface of a spectacle lens, an optical component manufactured according to that method, in particular a spectacle lens, as well as a method of manufacturing a polishing tool are disclosed.

Abstract: The device includes receiver elements (121, 114) for receiving the ophthalmic lens; on either side of the receiver elements, firstly lighting elements (S) for illuminating the ophthalmic lens (103) installed on the receiver elements, and secondly acquisition elements (122, 125, C) for acquiring the shadow of the ophthalmic lens illuminated by the lighting elements (S); measurement elements (S, 124, C) suitable for measuring the optical deflection power exerted by the ophthalmic lens on at least one light ray and for delivering a signal representative of the deflection power; and an electronic and computer system including geometrical correction calculation instructions for deducing from the measured deflection power a corrected shape for at least a portion of the shadow of the ophthalmic lens as perceived by the acquisition elements (122, 125, C)

Abstract: Ophthalmic rough-cut and polishing wheels having a plurality of swarf clearance grooves formed across the shaping face are described. The grooves are spaced around the shaping face of the wheels, wherein the slots are configured so as to be substantially angled either towards or away from one another.

Abstract: Method of manually centering an ophthalmic lens, includes: a) acquiring and storing the shadow of a predetermined geometrical figure formed on a transparent support interposed between lighting and acquisition elements while the support is illuminated; b) superposing the lens and support; c) acquiring and storing the detected by the lens while the latter and support are illuminated; d) using the acquisition elements to acquire the shadow of the center and/or axis marking of the lens; e) displaying firstly the shadow of the center and/or axis marking, and secondly a virtual centering target corresponding to the position desired for the center marking relative to a reference point of the rim of the frame; f) deducing a corrected relative position for the reference point of the frame rim relative to the center marking, or vice versa; and g) putting the shadow of the centering marking of the lens manually into coincidence with the centering virtual target.

Abstract: An apparatus for polishing an optical surface, in particular an optical surface of a spectacle lens, is disclosed. The apparatus comprises a polishing head having a polishing tool, the polishing tool being provided along a common axis, one behind another, with a first preferably rigid member, a second elastic member, and a polishing lining, each extending essentially radially relative to the axis. The second elastic member is configured to be increasingly soft in a radial outward direction. Moreover, a method of polishing an optical surface, in particular a surface of a spectacle lens, an optical component manufactured according to that method, in particular a spectacle lens, as well as a method of manufacturing a polishing tool are disclosed.

Abstract: A polishing apparatus includes a polishing jig. The polishing jig includes an elastic balloon member, a fixture, and a fluid supply portion. The fixture airtightly closes the rear opening portion of the balloon member. The fluid supply portion supplies a fluid into a space formed by the fixture and balloon member. The balloon member has a cup shape constructed by a dome portion and a cylinder portion extending backward from the outer periphery of the dome portion. The fixture fixes the opening portion of the cylinder portion of the balloon member.

Abstract: A raster cutting apparatus and method for producing accurately formed, aspheric ophthalmic lenses having a good quality surface finish. The accurate form and good surface finish are obtained by using a substantially spherically shaped cutting tool having a large radius. The methods include utilizing a cutting path which provides substantially constant cutting-force, such as a constant surface-cutting-speed raster pattern.

Abstract: A lens surface cutting method for a spectacle lens includes the steps of calculating the mean curvature of a lens surface (5) to be machined, calculating a helical machining path (4) that matches the mean curvature, and cutting the lens surface (5) to be machined by a cutting means. The helical machining path (4) calculated by the helical machining path calculating step is a path in which helix spacings P (=P1, P2, . . . Pn) on the lens surface (5) to be machined are equidistant and a helix spacing d (=d1, d2, . . . dn) on an X-Y projection plane 100 increases continuously from a lens outer periphery toward a center. The cutting means cuts the lens surface (5) to be machined from the outer periphery toward the center along the helical machining path (4). Thus, a spectacle lens having a lens surface with a surface accuracy that is almost uniform throughout an entire surface can be obtained.

Abstract: A fiber optic polishing apparatus is disclosed including a single degree-of-freedom (DOF) gear transmission system, a pressurizing module, a fixture module, and a housing assembly motorized polisher. The single DOF gear transmission system would enable a fiber optic polishing machine, or polisher to be driven by only one motor, or by human hand. The manual polisher is a unique field polishing machine where electricity or battery is not available or not allowed. Both manual polisher and motorized polisher have the following features: polishing up to four connectors or ferrules simultaneously; adjustable force ensures consistent finish for a wide variety of connector types and the number of connectors in the fixture; quick release for convenient removal of polish fixture; low center of gravity for high stability; small footprint for multiple-machine operation to avoid time-consuming film change.

Abstract: The present invention provides a cerium oxide-based abrasive ensuring high removal rate, less generation of scratches, high-precision polished surface with small surface roughness, and a safe, simple and low-cost production process. Further, the present invention provides a method for producing such an abrasive. The method of the present invention comprises (a) adding a precipitant to an aqueous cerium-containing light rare-earth salt solution to precipitate a light rare-earth salt, thereby obtaining a first slurry containing a light rare-earth salt particle; (b) adding a fluorinating agent to a slurry containing a light rare-earth salt particle to react the light rare-earth salt with the fluorinating agent, thereby obtaining a second slurry containing a light rare-earth fluoride particle; (c) mixing the first slurry and the second slurry to obtain a mixed slurry; and (d) drying and firing the mixed slurry, and a cerium oxide-based abrasive obtained by this method.

Abstract: A mirror for use in a projection exposure apparatus is described. The mirror has a main surface extending beyond an outline of an optical surface of the main surface. The optical surface has a roughness of less than 1 nm rms, and the outline of the optical surface includes a portion where the main surface extends beyond the optical surface by less than 0.2 mm. Manufacturing the mirror may involve polishing the optical surface in regions of the main surface extending beyond the optical surface and removing material of the substrate carrying a portion of the surface extending beyond the optical surface.

Abstract: The present invention provides a slurry composition and method for polishing organic polymer-based ophthalmic substrates. The slurry composition according to the invention includes an aqueous dispersion of abrasive particles and a pyrrolidone compound. The abrasive particles can be alumina, zirconia, silica, titania or combinations of the foregoing. Slurry compositions according to the invention can be used to polish all types of organic polymer-based ophthalmic substrates, but are particularly useful for polishing organic polymer-based ophthalmic substrates having an index of refraction greater than 1.498 because they remove such materials at a greater efficiency than conventional slurry compositions without detrimentally affecting the quality of the resulting surface.

Abstract: The invention concerns a locking device comprising a rigid base (2) and a deformable pocket (3) containing a granular material (13). Discharging means (4) are provided for gas exchange between the inside and the outside the deformable pocket (3).

Abstract: A grinding and polishing machine, in particular for lenses, has at least one tool spindle and at least one workpiece. The tool spindle is constructed to hold a respective tool on the same axis at both ends and is mounted in a spindle housing which can be pivoted about a pivot axis arranged at right angles to the tool spindle in order to provide in each case one tool for machining engagement and also at various defined angle positions with respect to the workpiece spindle. A drive arranged on the pivot axis pivotably moves the tool spindle about the pivot axis for the desired machining engagement and rotates the tool about the pivot axis into the various angle positions with respect to the workpiece.

Abstract: A method of fabricating or preparing an optical component, such as a mirror, using an amorphous oxide coated substrate is presented. An amorphous oxide coating is applied to an optical substrate. An assessment of surface roughness of the coated surface is performed. The coated surface is polished based on the assessment. Initial assessments can be conducted and polishing can be performed based on those initial assessments prior to applying the coating to better prepare the surface for the coating. Each assessment can assess the surface's Mid-Spatial Frequency Roughness (MSFR), High-Spatial Frequency Roughness (HSFR), or both. The performing of the assessments, polishing and/or coating can be computer-controlled. This process is ideal in the fabrication of an optical component formed from a substrate with a near-zero coefficient of thermal expansion. An optical component fabricated in this manner is also presented.

Abstract: A surface to be polished having a plurality of surfaces of significantly different curvatures can be polished evenly by the use of resilient abrasive members by using a polishing method including the steps of selecting at least two resilient abrasive members 10a, 10b from the resilient abrasive members having a plurality of dome-shaped portions of different curvatures determined by a plurality of curvatures on the surface to be polished of the polishing target, and mounting the selected resilient abrasive members 10a, 10b to specific abrasive member mounting jigs 20a, 20b and polishing the surface to be polished of the polishing target L2.

Abstract: A transportation system and method or methods for the restoration, re manufacturing, reconditioning or any combination thereof, a vehicle headlight fixture or vehicle headlight fixture lens; where the system is comprised of using any mode of transportation as a service, combined with or without the application of any method for the, restoration, re manufacturing, reconditioning or any combination thereof, on a vehicle headlight fixture or vehicle headlight fixture lens or any combination thereof, or any service for communicating the aforementioned system and method or methods or any combination thereof using any telecommunication configuration. This abstract is not to be considered limiting, since the embodiments may deviate from any content.

Abstract: A lens layout block device comprising a seal feeding device that supplies an elastic seal to a seal sticking position (A5). The elastic seal is loaded in a tape loading part in the form of a seal tape covered by a mount and a protective sheet and wound in a roll shape and fed by driving a motor. The protective sheet is separated by a protective sheet separating mechanism. At the seal sticking position (A5), a sensor detects the leading edge of a positioning hole in the mount and stops the conveyance of the seal tape after the seal tape is fed from the detection position for a specified time. The stop position is determined as the reference sticking position of the elastic seal and a lens holder is pressed against the elastic seal from above. The mount is pulled down by the seal separating mechanism to separate the mount from the elastic seal.

Abstract: A method for auto-calibration of at least one tool (36) in a single point turning machine (10) used for manufacturing in particular ophthalmic lenses (L) is proposed, in which a test piece of special, predetermined geometry is cut with the tool and then probed to obtain probe data. The method subsequently uses the probe data to mathematically and deterministically identify the necessary tool/machine calibration corrections in two directions (X, Y) and three directions (X, Y, Z), respectively, of the machine. Finally these corrections can be applied numerically to all controllable and/or adjustable axes (B, F1, X, Y) of the machine in order to achieve a (global) tool/machine calibration applicable to all work pieces within the machines operating range. As a result two-dimensional (2D) tool/machine calibration and three-dimensional (3D) tool/machine calibration, respectively, can be performed in a reliable and economic manner.

Abstract: In a method for producing optical elements, material on a blank (20) is removed with an abrasive liquid jet (32). The liquid jet (32) has a jet thickness (d) which is greater than the dimension (D) of the blank (20) in a plane (E) perpendicular to the direction (R) of the liquid jet. Predefined removal profiles in aspherical form can be achieved by the liquid jet (32) being guided onto the blank (20) at different angles of incidence (?).

Abstract: An eyeglass lens processing apparatus includes: a hole forming portion that includes a hole forming tool which forms a hole for attaching a rimless frame in an eyeglass lens; and breakage detector that detects whether or not the hole forming tool is broken.

Abstract: The invention concerns a method for producing ophthalmic lenses that uses plastic blanks in the form of flat, round discs. The outer edge of said plastic blanks is clamped and the desired final surface geometry and surface quality of the front faces of the lens are subsequently produced by a machining process using grinders and/or lathes and by smoothing and polishing processes. During machining, a thicker annular region is retained on the outer circumference of the workpiece. The annular region clamps or arranges the workpiece during machining and transport operations and stabilizes the lens for additional machining. Shaped pieces for identifying the machining axes are attached to the annular region. The lens is provided with fine markings to characterize the lens that has been produced, with the lens then being separated from the region.

Abstract: An elastic polishing tool that comes into contact with a surface to be polished of a lens and rotates to polish the surface, includes: an elastic polishing body which has a cylindrical shape and whose shape can be changed according to the surface to be polished; and a polishing pad that is adhered to one surface of the elastic polishing body opposite to the surface to be polished of the lens, wherein the polishing pad has a diameter larger than the length of an arc of the elastic polishing body in a cross section including a rotation axis of the elastic polishing tool.

Abstract: The invention relates to a method of machining a face (3) of an ophthalmic lens (1), comprising: a main machining step in which the position of a machining tool (8) is synchronised with the angular position of the ophthalmic lens (1) which is rotated around an axis of rotation (4) that is transverse to the face (3), in order to provide the face with a machined surface that is asymmetrical in relation to the axis of rotation (4) of the ophthalmic lens (1); and a complementary machining step in which a recess (22) is machined around the axis of rotation (4) of the lens (1).

Abstract: The lens suction jig installing apparatus of the present invention comprises a position adjustable pedestal for holding a spectacle lens where a plurality of indices are formed that are provided with a predetermined space on a surface; a position adjusting device for displacing the pedestal within the position adjustable range; an image capture device for capturing an image of the spectacle lens; an image processing device for image-processing to detect the indices based on the image of the spectacle lens; a display device for displaying an image; a display control device for controlling in order to make the display device display an image of the spectacle lens image-captured by the image capture device and an image of the indices obtained by the image-processing; and a jig installing device for installing a lens sucking lens at a predetermined position of the spectacle lens.

Abstract: An adhesive tape, interposed between a lens to be processed and a holding jig when the lens is mounted in a lens processing machine, which has a plastic foam with holes opening in an adhering surface and an adhesive layer formed on the adhering surface of the plastic foam, and having a suction function for providing suction to the adhering surface together with elastic restoration after the plastic foam is deformed under compression. The adhesive tape of the present invention also exhibits sufficient shear adhesive strength in relation to a lens that has received surface processing and can realize precise lens processing.

Abstract: A polishing machine for optical elements, comprising: a spindle arranged to rotationally drive an optical element; a polishing tool mobile relative to the spindle; a front face provided with a door enabling the access to the spindle and to the polishing tool; wherein the polishing tool is mounted on a body which is rotationally mounted on sliding means by way of a first axis, the sliding means being substantially perpendicular to the front face.

Abstract: The present invention relates to a method of controlling an ophthalmic edger device, and a machine programmed to edge and ophthalmic lens blank. A lens blank and an edger device for forming a groove in a peripheral edge of the lens blank are provided. A central processing unit is provided, which is operably associated with the edger device for controlling operation of the edger device. Processing instructions are transmitted from the central processing unit to the edger device, wherein the processing instructions comprise forming a groove in a peripheral edge of a lens blank, and removing lens material debris from the formed groove.

Abstract: A lens blocking device is disclosed that includes a frame, a light source mounted on the frame, a carriage having a first end and a second end mounted on the frame for sliding movement between first and second positions, a first mirror mounted on the carriage first end and a lens block holder mounted on the carriage second end and shiftable between third and fourth positions with respect to the carriage, a stage disposed between the light source and the carriage, and including an opening, for supporting an object, an at least partially translucent screen generating a display image operably connected to the support frame, at least one second mirror arranged to reflect an image of an object on the stage from the first mirror, when the carriage is in the first position, onto the screen, and an actuator operably connected to the carriage.

Abstract: Blocking apparatus and a blocking method allow precise alignment of an axis of a button with an axis of a block for blocking process of lens manufacturing. According to another aspect, the invention provides a blocking apparatus and a blocking method for automatically compensating variations in a button geometry without requiring complex adjustments during blocking process of lens manufacturing. According to yet another aspect, the invention provides a button holder that may flexibly float on a seat stage of a blocking apparatus, where the button holder may include a mechanism to self-align on the seat stage after a block of the blocking apparatus interfaces with the button holder.

Abstract: Numeric control bore for boring an eyeglass lens and corresponding method. The bore comprises a bedplate (1), attachment device (3) for the lens (5), rotation device (9) for the lens (5) according to a first axis (7) (first degree of freedom), and a support column (11) with a head (15), wherein the attachment device (3) and the support column (11) can be moved between each other (second degree of freedom). The support column (11) has a first end linked to the bedplate (1) being capable of rotating about a second end (third degree of freedom) and the head (15) is linked to the column (11) by translation structure (fourth degree of freedom). The apparatus only has these four degrees of freedom in order to fix the relative position between the head (15) and the lens (5).

Abstract: The method for making an optical lens according to the present invention is characterized in comprising: a optical lens preform fabrication step of fabricating a optical lens preform which comprises a first curved portion which serves as an optically functioning part and which is on one side, a flat surface portion which is formed on the opposite side to the first curved portion, and paired beveling surfaces which are formed on the both sides of the flat surface portion; a drawing step of drawing a optical lens preform 40 until the optical lens preform 40 has obtained a desired outer diameter; and an optical lens fabrication step of cutting thus drawn optical lens preform and accordingly fabricating an optical lens. With this making method, since there are paired beveling surfaces disposed, it is possible to suppress a drawing-induced distortion.

Abstract: An unexpanded perlite ore polishing composition is shown. The composition comprises base material having grains of unexpanded perlite ore of a selected distribution of particle sizes which undergo fracturing of the grains as a function of an abrasive force applied to the base material. The selected distribution of particle sizes includes a significant volume of grains of unexpanded perlite ore having a (d90) particle size in a range of about 101 to about 229 ?m. The base material is responsive to an abrasive force being applied thereto during polishing resulting in continued fracturing of the grains of unexpanded perlite ore to yield a final polishing composition having a sufficiently low level of abrasiveness under said abrasive force making it suitable for use in polishing. Compositions for polishing acrylic dentures and CRT tube surfaces using the unexpanded perlite ore polishing composition and methods for polishing the same are also shown.

Abstract: A facetting area setting device for setting a facetting area so as to perform a facetting on an edge corner of an eyeglass lens which has been finished, includes: an input unit that inputs a target lens shape; a display unit that displays a front outline graphic based on the input target lens shape; a position setting unit that sets at least three points in the displayed front outline graphic; and an area setting unit that sets a facetting area on the basis of the input target lens shape and the set points. The area setting unit sets the facetting area by joining the set points with at least one of a straight line and a curved line.

Abstract: The present invention provides a slurry composition and method for polishing organic polymer-based ophthalmic substrates. The slurry composition according to the invention includes an aqueous dispersion of abrasive particles and a pyrrolidone compound. The abrasive particles can be alumina, zirconia, silica, titania or combinations of the foregoing. Slurry compositions according to the invention can be used to polish all types of organic polymer-based ophthalmic substrates, but are particularly useful for polishing organic polymer-based ophthalmic substrates having an index of refraction greater than 1.498 because they remove such materials at a greater efficiency than conventional slurry compositions without detrimentally affecting the quality of the resulting surface.

Abstract: An adhesive tape which is to be arranged between a lens and at least one of a plurality of chucks in an edge-machining apparatus comprises an adhesive face for being in contact with the lens. A measurement of an adhesive strength of the adhesive face is 4 gf (0.0392 N) or more when a polyethylene terephthalate plate which has been subjected to a surface treatment with a fluorine-modified silicone parting agent is used as a test plate in an adhesive strength test method based on a 180°-peeling method as defined in JIS Z 0237 “adhesive tape/adhesive sheet test method”. A technique which can be used to edge the lens in which an antifouling layer is formed by using a fluorine-containing silane compound having an excellent antifouling effect is also provided.

Abstract: A whetstone pellet 1 is composed of a columnar base body 2 to be fixed on a pedestal 9, and an abrasive grain part 5 containing numerous abrasive grains formed by electroless plating on an end surface 3 of the base body 2. Upon forming the abrasive grain part 5, a plated layer is formed on the end surface 3 of the base body 2 under stirring a plating solution containing abrasive grains, whereby the distribution of the abrasive grains in the abrasive grain part 5 can be uniformized.