CZ2005126A3 - Fully automatic method for blocking optical lenses - Google Patents

Fully automatic method for blocking optical lenses Download PDF

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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
Authority
CZ
Czechia
Prior art keywords
optical lens
method according
blocked
lens
characterized
Prior art date
Application number
CZ2005126A
Other languages
Czech (cs)
Other versions
CZ304718B6 (en
Inventor
Dieter Rohr
Andreas Simke
Original Assignee
Rodenstock Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE2002134628 priority Critical patent/DE10234628A1/en
Application filed by Rodenstock Gmbh filed Critical Rodenstock Gmbh
Publication of CZ2005126A3 publication Critical patent/CZ2005126A3/en
Publication of CZ304718B6 publication Critical patent/CZ304718B6/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005Blocking means, chucks or the like; Alignment devices
    • B24B13/0052Lens block moulding devices

Abstract

The invention relates to a method for receiving or blocking optical lenses and especially lenses for glasses for other machining steps, such as the machining of a surface which is not finished and/or the machining of the edge of the lens. The inventive method consists of the following steps: the lens is arranged in a receiving device in such a manner that the surface whereon the lens should be received or blocked is placed on top; the receiving device whereon the lens is positioned relative to a block piece which is arranged on the surface of the lens which is to be blocked after positioning and against which the lens is maintained according to the following machining steps; a collar is arranged on the block piece which is provided with a transversal opening and on the lens in such a manner that a lateral and downwardly closed casting space is formed, said space being open towards the top; a casting material is introduced into the casting space from above through the transversal opening; the blocked lens is removed from the receiving device after solidification of the casting material.

Description

- 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.

Background Art

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.

Claims (5)

  1. - 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).
  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 known
    m 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.
  3. Method according to one of Claims 1 to 9, characterized in that a bearing device (2) is positioned relative to the locking element (3).
  4. 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.
  5. Method according to one of claims 1 to 11, characterized in that it is carried out fully automatically.
CZ2005-126A 2002-07-29 2003-07-29 Fully automatic method for blocking optical lenses CZ304718B6 (en)

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

Publications (2)

Publication Number Publication Date
CZ2005126A3 true CZ2005126A3 (en) 2005-06-15
CZ304718B6 CZ304718B6 (en) 2014-09-10

Family

ID=30128513

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)

Country Link
AU (1) AU2003264244A1 (en)
CZ (1) CZ304718B6 (en)
DE (2) DE10234628A1 (en)
WO (1) WO2004015482A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
AU2003264244A8 (en) 2004-02-25
WO2004015482A2 (en) 2004-02-19
WO2004015482A3 (en) 2004-09-23
DE10392953D2 (en) 2005-04-21
AU2003264244A1 (en) 2004-02-25
DE10392953B4 (en) 2009-12-17
CZ304718B6 (en) 2014-09-10
DE10234628A1 (en) 2004-02-12

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MM4A Patent lapsed due to non-payment of fee

Effective date: 20140729