CZ2005126A3 - Fully automatic method for blocking optical lenses - Google PatentsFully automatic method for blocking optical lenses Download PDF
- Publication number
- CZ2005126A3 CZ2005126A3 CZ2005126A CZ2005126A CZ2005126A3 CZ 2005126 A3 CZ2005126 A3 CZ 2005126A3 CZ 2005126 A CZ2005126 A CZ 2005126A CZ 2005126 A CZ2005126 A CZ 2005126A CZ 2005126 A3 CZ2005126 A3 CZ 2005126A3
- Prior art keywords
- optical lens
- method according
- Prior art date
- 230000003287 optical Effects 0 abstract claims description title 80
- 230000000903 blocking Effects 0 abstract claims description title 19
- 238000005266 casting Methods 0 abstract claims description 29
- 239000000463 materials Substances 0 abstract claims description 26
- 239000011521 glass Substances 0 abstract claims description 18
- 238000003754 machining Methods 0 abstract claims description 9
- 238000007789 sealing Methods 0 claims description 23
- 238000003860 storage Methods 0 claims description 18
- 239000011799 hole materials Substances 0 claims description 8
- 239000002184 metal Substances 0 claims description 8
- 229910052751 metals Inorganic materials 0 claims description 8
- 238000000034 methods Methods 0 claims description 7
- 229910045601 alloys Inorganic materials 0 claims description 4
- 239000000956 alloys Substances 0 claims description 4
- 230000001276 controlling effects Effects 0 claims description 2
- 238000000151 deposition Methods 0 claims description 2
- 238000002844 melting Methods 0 claims description 2
- 239000004744 fabric Substances 0 claims 1
- 238000007711 solidification Methods 0 abstract 1
- 230000000750 progressive Effects 0 description 6
- 238000003384 imaging method Methods 0 description 4
- 238000005516 engineering processes Methods 0 description 2
- 238000000227 grinding Methods 0 description 2
- 230000001976 improved Effects 0 description 2
- 238000003780 insertion Methods 0 description 2
- 239000000203 mixtures Substances 0 description 2
- 239000004033 plastic Substances 0 description 2
- 229920003023 plastics Polymers 0 description 2
- 238000005498 polishing Methods 0 description 2
- 231100000331 toxic Toxicity 0 description 2
- 230000002588 toxic Effects 0 description 2
- 238000007792 addition Methods 0 description 1
- 230000015572 biosynthetic process Effects 0 description 1
- 239000004568 cement Substances 0 description 1
- 238000001816 cooling Methods 0 description 1
- 238000006073 displacement Methods 0 description 1
- 230000000694 effects Effects 0 description 1
- 230000002349 favourable Effects 0 description 1
- 239000000945 fillers Substances 0 description 1
- 238000005755 formation Methods 0 description 1
- 239000011133 lead Substances 0 description 1
- 230000000670 limiting Effects 0 description 1
- 239000000314 lubricants Substances 0 description 1
- 238000007515 machining process Methods 0 description 1
- 238000004519 manufacturing process Methods 0 description 1
- 239000002609 media Substances 0 description 1
- 229910001092 metal group alloys Inorganic materials 0 description 1
- 230000036961 partial Effects 0 description 1
- 238000005365 production Methods 0 description 1
- 239000000047 products Substances 0 description 1
- 230000002829 reduced Effects 0 description 1
- 239000001993 wax Substances 0 description 1
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/005—Blocking means, chucks or the like; Alignment devices
- B24B13/0052—Lens block moulding devices
- i - TV 2.oo5 - 42 £ • • • • • • • • • • • • ··
Fully automatic optical lens blocking technology
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of storing or blocking optical lenses for their further processing or handling.
Optical lenses must be "blocked" in a professional jargon to process their previously unfinished surfaces and / or edges in order to further perform the processing operations in relation to the finished surface or surfaces, i.e. in the correct position.
For example, in the manufacture of spectacle lenses, it is customary to produce a so-called blank, i.e., a finished, circular, or spectacle-glass with a trimmed edge. Only according to a particular job, the so-called recipe area is then produced, usually a concave outer surface, according to the recipe data on spherical and toric effect, axis position, prism and possible addition in multiple optical powers or specific progressive surfaces. Subsequently, or in combination with the production of the surface according to the recipe, the edges of the spectacle glass are adjusted according to the rim data into which the spectacle glass is to be inserted. Appropriate methods of storage or blocking are known from the state of the art: Only DE-4431880 A1, DE-69604116 T2 can only be used as examples. or US-PS-3996701. Indeed, the term ..... documents are explicitly referred to in more detail here. In most of the known blocking methods, a plurality of different sealing rings have to be used, which are selected according to different diameters, the punch and the combination of curvature of individual optical lenses. Another disadvantage is that the setting of values (prisma, tilt angle, position of axes, etc.) must be performed for each spectacle glass separately.
Thus, the choice of the sealing rings, the individual settings and the reassembly of the locking rings after their use is performed by the person concerned, which can lead to considerable errors due to the human factor.
In addition, non-circular glasses are produced, for example, to provide critical glazing glasses with modified edges, for which purpose the smallest allowable locking ring must be used, resulting in a thin edge of such glasses being overhang and not sufficiently supported during grinding and polishing. During further processing, a transition between the blocking metal and the optical lens occurs on the locking surface, which may, depending on the circumstances, result in surface deformations.
Spectacle lenses with progressive or other non-rotationally symmetrical surfaces may be difficult to block; this is especially true of progressive glasses with large additions, - 3 - - 3 - «································································································· items abutting the cement ring. Another important source of error is the comparison or refolding of blocked optical lenses by markers or gravures. These tags are usually located on the functional area. In the prior art methods, these marks are observed through the glass, so that parallax or imaging errors occur.
The casting technology used in the prior art leads to a closed system. Since no riser is present, the loss of material volume cannot be compensated for when the refill material is cooled. The lenses are then formed on the glass surface, which can cause imprints on the plastic optical lenses as a result of the forces in the machining process. Other sources of error are the manual adjustment of the reference surface on the locking material, the worn curve disc, and the wear of the locking pins of the locking element to tilt the sealing ring.
A further disadvantage of the state of the art is that, in addition to the respective worker, other operators also come into contact with the toxic and incompatible blocking metal. In addition, expensive interlocking metal is lost due to the contact and breaking of the glass fragments and the subsequent processing of the reference surface. In known non-automated processes, the operator inevitably comes into contact with the locking metal. As a result of the breaking of the glass fragments, the blocking metal is expensive and incompatible with the environment. - 4 - - 4 - • * ·· ·· · · · · · 9 · 9 · 99 ········ · ················································ ···
Thus, there is a need for a method of locking without the use of sealing rings, in which accuracy is improved and fully automated. The extra special requirements also bring about the deformation-sensitive behavior of, in particular, thin plastic lenses as well as the processing of non-circular spectacle lenses.
Also, especially when developing new spectacle lenses, it is important that imaging defects are reduced or even eliminated. By imaging defect is meant the displacement of the optical center of the optical lens relative to the central axis of the locking element. Typically, in conventional prior art blocking methods, imaging defects are always blocked. SUMMARY OF THE INVENTION It is an object of the present invention to provide a blocking method which does not suffer from the aforementioned drawbacks and which enables the locking element to be automatically and positively positioned and a large area adjacent to the casting material without lining or the like.
SUMMARY OF THE INVENTION
This object and the drawbacks of the known solutions of this kind largely eliminates the method of storing, or blocking, the optical lens and, in particular, the spectacle glass for further processing operations, such as machining the unfinished surface and / or treating the edge of the optical lens, comprising the following steps: the optical lens is inserted into the storage device such that the surface on which the optical lens is to be deposited or blocked is - 5 - - - - - - - · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
F is located at the top, the storage device with the optical lens mounted thereon is positioned. with respect to the locking element which, after positioning, is attached to a blocked surface of the optical lens on which the optical lens is placed during subsequent processing operations, to a locking element provided with a through hole, and a sealing collar is mounted on the optical lens such that this defines a laterally and downwardly closed but open casting space, the casting space being filled through the through-hole with a casting lubricant from above, - after the casting material has solidified, the blocked optical lens is removed from the storage device.
Accordingly, the method of depositing or blocking the optical lens, and in particular the spectacle glass, for further processing operations thereof, such as the machining of the unfinished surface and / or the treatment of the edge of the optical lens according to the invention, comprises the following steps:
The optical lens is inserted into the storage device such that the surface on which the optical lens is to be stored or blocked is located at the top. This insertion into the storage device can be performed by a positioning device, for example a manipulator or an industrial robot. There are no great demands on the accuracy of this manipulator, since a comparison of the optical lens position is performed by the storage device. The storage device with the optical lens mounted thereon is positioned relative to the locking element which is put on after positioning - 6 - - 6 - • * ·· · · · · · 9 * 9 999 ······· 9 9999 9 999 9 999 9 999 9 999 9 999 9 999 9 999 9 999 9 999 9 999 99 999 the optical lens on which the optical lens is stored during the following processing operations in single processing plants. The positioning of the optical bar relative to the locking element preferably takes place translationally and rotationally, so that prisms, cylindrical axes and other non-rotationally symmetrical features are also possible. Furthermore, it is advantageous if the blocking element is displaceable only in one axis, in the vertical axis, and the bearing device is compared with the optical lens with respect to the locking element.
Here, the locking element can be embodied in a known manner, i.e. it can be provided with a holder for conventional machine tools, which allows the clamping element to be oriented together with the optical lens in the individual machine tools.
The locking element is further preferably provided with a through hole. The sealing sleeve is mounted on the locking element and the optical lens so as to define a closed but open casting space at the lateral and downward surface of the optical lens. It is preferred that the sealing collar, which is preferably flexible, is mounted on top of the optical lens.
After the sealing sleeve has been fitted, the casting space is filled through the through-hole through the casting material, which can be an alloy, for example a low-melting metal alloy or alternatively a blocking metal, optionally wax.
After the casting material has solidified, the locked optical lens is removed from the storage device and can then be assisted by - 7 - - 7 - · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · The locking element is clamped in a machine tool such as a grinding machine, a polishing machine, a milling machine, lathe or machine for processing the edge of the optical lens. ν '
It is particularly advantageous if the sealing collar is attached to the periphery of the optical lens and the casting material abuts and clings to the blocked surface of the optical lens. In this way, the optical lens is optimally supported, especially when machining thin optical lenses.
In any case, the method according to the invention allows the optical lenses to be blocked on both the concave and convex surfaces. The sealing sleeve is removed after the casting material has solidified.
The optical lens or storage device is compared using a sensor.
The sensor may be a video camera that senses the shape, marks or engravings on the blocked side of the optical lens and whose output signal is input into the evaluation and control unit to compare the storage device and / or the locking element.
The sealing collar is preferably a flexible sealing collar.
The filling of the casting material into the through hole of the locking element is preferably sensed by a sensor whose output signal is fed into the evaluation and control unit for controlling the filling process.
- 8 - • t • Ψ · • t t * * • • • • • «• • • • • • • M control units.
Preferably, the oily material is a non-volatile metal or alloy or waxy material
The optical lens is aligned translationally and rotationally with respect to the locking element and prisms, cylindrical axes or other non-rotationally symmetrical features are also possible. The storage device is preferably positioned relative to the locking element.
It is also possible for optical lenses with pre-treated edges, i.e. non-circular optical lenses, to be blocked.
Finally, the process of the invention can be carried out fully automatically.
A device suitable for performing the method of centering and locking the optical lens, in particular spectacle glass, by means of a locking element according to the invention is thus provided with a sealing collar between the locking element and the ophthalmic lens, which is mounted so that a casting space is formed which is filled with the casting material.
Various embodiments are possible, for example, the axis of rotation of the locking element may pass through the center of the progressive surface.
The method according to the invention is particularly suitable for making a progressive surface on the eye side according to the recipe. According to the process of the present invention, the drawbacks of the prior art described above are eliminated in each case. The process can be fully automated and no sealing rings are required. The method of the invention is also applicable to all diameters and optical power of optical lenses.
A particular advantage of the method according to the invention is that the distortion of the optical lenses and the formation of undesirable lunches are minimized. The method of the invention is also applicable to both circular and non-circular optical lenses. Further, positioning the correct locking in prisms, additions, and adjusting the tilt angle and axis position results in an improved product quality.
According to the method of the invention, the theoretical optical center, prism, additions, tilt angle and optical lens axis can also be positioned relative to the calculated values according to the invention. Thus, image defects are minimized or eliminated. BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further illustrated by the following examples, which are described by reference to the accompanying drawings, in which: Fig. 1 · ♦ · · * ·· ·· ··· The principle of a fully automatic way of blocking the lenses in the ♦ «· · · princip princip princip princip princip princip princip princip princip princip · · · · princip princip princip 10 ·· · · · · * · · · · · · · · · · ·
EXAMPLES OF THE INVENTION
The optical lens 1, the spectacle glass, is inserted into the lens
the receiving device 2, allows the optical lens to be compared both translationally and rotationally with respect to the locking element 3 which is displaceable only in the vertical direction. This is illustrated in Figures 1 and 2. Here, the comparison of the optical lens 1 can be advantageously carried out by means of a control and evaluation device (not shown) which evaluates the signal from the camera 4 which scans the engravings and / or marks on the blocked surface of the optical lens 1. The optical lens 1 is brought into the calculated position in the direction of the X, Y and Z axes and around the axis of rotation. By means of the adjusting members, the storage device 2 can be additionally tilted.
With the free adjustment in all axes, the optical lens 1 can be placed in the correct position of the mounting and for engaging the locking element 3.
After insertion of the locking element 3, a flexible sealing collar 5 is placed from above, which defines the casting space for the material by which the locking element 3 is connected for further processing operations with the optical lens 1 - partial illustration 3. The sealing collar 5 seals the casting space at the periphery of the optical lens 1. The flexibility of the sealing collar 5 ensures that both spherical and toric and progressive surface geometry are reliably sealed. This prevents damage at the point of transition between the locking material and the optical lens 1. Filling with the alloy or other alternative media is done through the through hole in the locking element 3 (Figure 4). - 11 - ·························· Thanks to the open inlet and the build-up of material inward from the outside, a favorable cooling curve is achieved. The material 1 is cooled inwardly from the outside. The filler opening 3 in the blocking element 3 acts as a pinch and can thus compensate for the volume loss that would otherwise result in uncontrollable lunches.
In addition, the risk of contact with toxic blocking material is avoided. The sealing sleeve 5 is then removed and the optical lens 1, together with the locking element 3 arranged thereon, can be inserted into the machine tool.
The invention has been described above by way of non-limiting example of the invention, which is apparent from the appended claims.
- - 12 - f (/ - - - - - - - - - - - - - - - - - - - • - - 1. A method for depositing, or blocking, an optical lens (1) and, in particular, a spectacle glass for further processing thereof, such as machining an unfinished surface and / or treating the edge of an optical lens (1) comprising the following: steps: the optical lens (1) is inserted into the storage device (2) such that the surface on which the optical lens is to be placed or blocked is located at the top, the storage device (2) with the optical lens (1) mounted thereon positioning with respect to the locking element (3) which, after positioning, is placed on the blocked surface of the optical lens (1) and on which the optical lens (1) is placed during subsequent machining operations; a sealing collar (5) is mounted on the optical lens (1) so that it defines a laterally and downwardly closed but open casting space, the casting space being filled with a casting material through the through hole, blocked by the casting material removing the optical lens (1) from the storage device (2).
- The method according to claim 1, characterized in that the sealing collar (5) is applied to the periphery of the optical lens (1) and the casting material abuts and lpi on the blocked surface of the optical lens (1).From the point of view of claim 1 or 2, it is knownm that the sealing collar (5) is removed after the casting material has solidified. Method according to one of claims 1 to 3, characterized in that the optical lens (1) or the storage device (2) is compared by means of a sensor. A method according to claim 4, characterized in that the sensor is a video camera (4) which senses the shape, marks or engravings on the blocked side of the optical lens (1) and whose output signal is fed to the evaluation and control unit for comparing the storage device (2). ) and / or the locking element (3). Method according to one of claims 1 to 5, characterized in that a flexible sealing collar serves as the sealing collar (5). Method according to one of Claims 1 to 6, characterized in that the filling of the casting material into the through hole of the locking element (3) is detected by a sensor whose output signal is fed to the evaluation and control unit for controlling the filling process. Method according to one of Claims 1 to 7, characterized in that the casting material is a low-melting metal or an alloy or - 14 - ·· ·· ·· ·· ···· MM M · Wax-like fabric. • • • • • • • • • • • • • • • • • • • • •9.4. A method according to any one of claims 1 to 8, wherein the optical lens (1) is aligned translationally and rotationally relative to the locking element (3) and prisms, cylindrical axes or other non-rotationally symmetrical features are also possible.
- Method according to one of Claims 1 to 9, characterized in that a bearing device (2) is positioned relative to the locking element (3).
- Method according to any one of claims 1 to 10, characterized in that the optical lenses (1) with pre-arranged edges, i.e. non-circular optical lenses (1) are blocked.
- Method according to one of claims 1 to 11, characterized in that it is carried out fully automatically.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|DE2002134628 DE10234628A1 (en)||2002-07-29||2002-07-29||Lens blocking process is fully automatic and consists of aligning, positioning, sealing, pouring and removing lens fro mold|
|Publication Number||Publication Date|
|CZ2005126A3 true CZ2005126A3 (en)||2005-06-15|
|CZ304718B6 CZ304718B6 (en)||2014-09-10|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|CZ2005-126A CZ304718B6 (en)||2002-07-29||2003-07-29||Fully automatic method for blocking optical lenses|
Country Status (4)
|AU (1)||AU2003264244A1 (en)|
|CZ (1)||CZ304718B6 (en)|
|DE (2)||DE10234628A1 (en)|
|WO (1)||WO2004015482A2 (en)|
Families Citing this family (5)
|Publication number||Priority date||Publication date||Assignee||Title|
|DE10300777A1 (en) *||2003-01-11||2004-07-22||Carl Zeiss||Method for parallax-free centering of an optical element|
|DE102005038063A1 (en)||2005-08-10||2007-02-15||Schneider Gmbh + Co. Kg||Preformed block piece with three support points|
|US9144483B2 (en) *||2006-01-13||2015-09-29||Boston Scientific Scimed, Inc.||Placing fixation devices|
|DE102008023093A1 (en) †||2008-05-09||2009-11-12||Satisloh Ag||Device for blocking workpieces, in particular spectacle lenses, for their processing and / or coating|
|DE102017201288A1 (en)||2017-01-26||2018-07-26||Breitfeld & Schliekert Gmbh||Method for positioning a lens|
Family Cites Families (9)
|Publication number||Priority date||Publication date||Assignee||Title|
|US3383808A (en) *||1965-05-25||1968-05-21||Lunette De Paris Inc||Lens block|
|US3451177A (en) *||1966-01-26||1969-06-24||Textron Inc||Lens blocker|
|US3512310A (en) *||1966-11-10||1970-05-19||Univis Inc||Two-piece ring block for lens blanks|
|FR1541963A (en) *||1966-11-10||1968-10-11||Univis||support block for the manufacturing of ophthalmic lenses and manufacturing method using this block|
|US3996701A (en) *||1975-06-30||1976-12-14||American Optical Corporation||Lens block with preform|
|US5505654A (en) *||1993-09-07||1996-04-09||Gerber Optical, Inc.||Lens blocking apparatus|
|DE4442181C1 (en) *||1994-11-26||1995-10-26||Loh Optikmaschinen Ag||Tool for fine working of optical lenses|
|FR2733710B1 (en) *||1995-05-03||1997-07-18||Essilor Int||Pre-wheel to the holding device of an optical lens, and its implementation METHOD|
|IL132436D0 (en) *||1999-10-18||2001-03-19||Prolaser Ltd||Automatic attachment of a finishing block to an ophthalmic lens|
- 2002-07-29 DE DE2002134628 patent/DE10234628A1/en not_active Withdrawn
- 2003-07-29 DE DE2003192953 patent/DE10392953B4/en not_active Expired - Fee Related
- 2003-07-29 CZ CZ2005-126A patent/CZ304718B6/en not_active IP Right Cessation
- 2003-07-29 AU AU2003264244A patent/AU2003264244A1/en not_active Abandoned
- 2003-07-29 WO PCT/DE2003/002557 patent/WO2004015482A2/en not_active Application Discontinuation
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|US7086928B2 (en)||System and method for ophthalmic lens manufacture|
|DE10128016B4 (en)||Plant for production of goods and process for setting up the plant|
|EP1666953B1 (en)||Method of producing a spectacle lens comprising spherical front side and progressive rear side|
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|EP1719585B1 (en)||Machine for machining optical workpieces, by name plastic spectacle lenses|
|US9254615B2 (en)||Method and an apparatus for manufacturing an optical lens|
|EP0281754A2 (en)||Method and apparatus for making prescription eyeglass lenses|
|US6813536B1 (en)||Method and device for computer numerical control of machining of spectacle lenses|
|EP1656248B8 (en)||Method for manufacturing ophthalmic lenses using circular blanks|
|US5630746A (en)||Spectacle lens edge grinding machine|
|US5951375A (en)||Support for optical lenses and method for polishing lenses|
|EP2266753A1 (en)||Block piece for holding an optical workpiece, in particular a spectacle lens, for processing thereof, and method for manufacturing spectacle lenses according to a prescription|
|EP0615814A1 (en)||Blocking system for prescription lenses|
|JPWO2005084885A1 (en)||Spectacle lens manufacturing method and spectacle lens manufacturing system|
|US5615588A (en)||Apparatus for processing the edge of ophthalmic lenses|
|US20020056801A1 (en)||Method for molding contact lenses|
|US6471891B1 (en)||Method for automatic manufacture of and printing on astigmatic contact lenses and apparatus therefor|
|FR2668412A1 (en)||System for mounting a lens body for its surfacing and contouring and corresponding method.|
|US6991525B2 (en)||Method and device for the surface machining of workpieces composed of non-brittle materials in optical lens manufacturing and tool for this purpose|
|US3431688A (en)||Method for processing of ophthalmic lens|
|US7448938B2 (en)||Method for supplying spectacle lens|
|EP1588224B1 (en)||Method and device for producing service blades|
|US3118198A (en)||Method of blocking lens|
|MM4A||Patent lapsed due to non-payment of fee||
Effective date: 20140729