WO2004015482A2 - Fully automatic method for blocking optical lenses - Google Patents

Fully automatic method for blocking optical lenses Download PDF

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Publication number
WO2004015482A2
WO2004015482A2 PCT/DE2003/002557 DE0302557W WO2004015482A2 WO 2004015482 A2 WO2004015482 A2 WO 2004015482A2 DE 0302557 W DE0302557 W DE 0302557W WO 2004015482 A2 WO2004015482 A2 WO 2004015482A2
Authority
WO
WIPO (PCT)
Prior art keywords
lens
method according
characterized
blocked
surface
Prior art date
Application number
PCT/DE2003/002557
Other languages
German (de)
French (fr)
Other versions
WO2004015482A3 (en
Inventor
Andreas Simke
Dieter Rohr
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 DE10234628.3 priority Critical
Priority to DE2002134628 priority patent/DE10234628A1/en
Application filed by Rodenstock Gmbh filed Critical Rodenstock Gmbh
Publication of WO2004015482A2 publication Critical patent/WO2004015482A2/en
Publication of WO2004015482A3 publication Critical patent/WO2004015482A3/en

Links

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

 Fully automated process for blocking optical lenses

DESCRIPTION

Technical field

The present invention relates to a method for receiving or blocking optical lenses for further processing or handling operations.

State of the art

Lenses have to be recorded in a defined manner for processing surfaces that have not yet been completed and / or the edge - “blocked” in technical jargon - in order to carry out the further processing operations correctly, ie in the correct position, in relation to the surface (s) that have already been completed can.

For example, in the manufacture of spectacle lenses, it is customary first to produce so-called blanks, that is to say one-sided finished, tubular or pre-rimmed spectacle lenses. The so-called recipe surface - usually the concave eye-side surface - according to the recipe data - spherical effect, toric effect, axis position, prism and, if necessary, addition in the case of multi-thickness or progressive recipe surfaces - is only produced when a specific order is available. Then or in combination with the production of the prescription surface, the spectacle lens is then edged according to the data of the frame in which the spectacle lens is to be inserted. Corresponding recording or block methods are known from the prior art: reference is made only by way of example to DE 44 31 880 AI, DE 696 04 116 T2 or US Pat. In addition, reference is expressly made to these publications in order to explain all the details which are not explained in more detail here.

Most of the known block methods have to use a large number of different kit rings, which are predetermined by the different diameters, thicknesses and curvature combinations of the different lenses. Another disadvantage is that the setting values (prism, tilt angle, axis position, etc.) have to be made separately for each lens.

The right choice of putty rings, the associated settings and the correct resorting to several blockers is currently being carried out by one person, which can lead to considerable errors.

In addition, non-round glasses, such as glasses with the smallest allowable block ring due to the minimization of the critical thickness, are manufactured, which means that the thin edge of such glasses sometimes protrudes very far and does not have sufficient support for grinding and polishing. The transition from the block metal to the lens is particularly evident during further processing on the blocked surface, so that the surface may warp under certain circumstances.

Glasses with progressive or other non-rotationally symmetrical surfaces can only be blocked with difficulty; this applies in particular to progressive lenses large additions, since then no exact support on the kit ring can be realized.

Another major source of error is the alignment according to the marking or the engraving of the lenses to be blocked. The markings are usually on the functional surface. According to the state of the art, these are viewed through the glass, so that there are parallax errors or imaging errors.

The casting technique used in the prior art leads to a closed system. After pouring, the warm material is enclosed. Since there is no "riser", the shrinkage cannot be compensated for by flowing material when cooling. Blowholes are formed on the glass surface, which can create impressions when machining forces are applied to plastic lenses. Other sources of error are the manual finishing of the reference surface on the block material, the wear on the cam disc and the wear on the pressure pins of the blocker to tilt the kit ring.

Another disadvantage of the prior art is that, in addition to the operator, some operators come into contact with the toxic, non-environmentally compatible block metal. By touching and breaking off the casting beads and by post-treating the reference surface, the expensive block metal is also carried over.

In the known non-automatable methods, the operator inevitably comes into contact with the block metal. By pulling off with the pull-off crown and breaking the pouring pearls entrains expensive and not environmentally friendly block metal.

There is therefore a need for a method for blocking without the use of kit rings, which increases the accuracy and can be fully automated. The sensitive warping behavior, especially in the case of thin plastic glasses and the consideration of non-round glasses, places very special additional requirements.

It is also important, especially when developing new progressive lenses, to reduce or even eliminate the aberration. An imaging error is the offset of the optical center of the glass to the center line of the block piece. In the conventional block methods according to the prior art, imaging errors are generally always blocked.

PRESENTATION OF THE INVENTION The object of the present invention is to provide a method with which the disadvantages described are eliminated, and which can be automated, a correct placement of the block piece and a large-area contact of the casting material without the formation of cavities or the like. enables.

This object is achieved by the method described in claim 1.

The method according to the invention for receiving or blocking optical lenses and in particular spectacle lenses for further processing steps, such as the processing of a surface that has not yet been completed and / or the processing of the lens edge shows the following process steps:

The lens is inserted into a receiving device in such a way that the surface on which the lens is to be picked up or blocked is above. This insertion into the receiving device can be done by a positioning device, such as a manipulator or an industrial robot. No great demands are made on the accuracy of the manipulator, since the alignment is carried out by the receiving device.

The receiving device with the lens placed on it is positioned relative to a block piece which, after being positioned, is placed on the surface of the lens to be blocked and on which the lens is held in the respective processing devices during the subsequent processing steps. The lens is preferably positioned relative to the block piece in a translatory and rotary manner, so that the setting of prisms, cylinder axes or other non-rotationally symmetrical features is also possible. It is further preferred if the block piece can only be displaced in one axis, the vertical axis, and the receiving device is aligned together with the lens relative to the block piece.

The block piece can be designed in a manner known per se, that is to say have a holder for conventional processing machines, which has an oriented The block piece can be clamped together with the lens in the respective processing machine.

Furthermore, according to the invention, the block piece is provided with a passage opening. A cuff is attached to the block piece and the lens in such a way that a casting space which is closed laterally by the cuff and downwards by the lens surface is formed, but is open at the top. The cuff, which is preferably a flexible cuff, is preferably put over the lens from above.

After the cuff has been attached, a casting material is poured into the casting space from above through the passage opening, which can be an alloy, such as a low-melting metal alloy or an alternative block metal, but can also be a wax.

After the casting material has solidified, the blocked lens is removed from the holding device and can then be used by means of the block piece in a processing device such as a grinding machine, a polishing machine, a milling machine, a lathe or a beveling machine.

It is particularly preferred if the sleeve lies against the edge of the lens, so that the casting material lies or adheres to the entire surface of the blocked surface of the lens. This gives you optimal support, especially when processing thin lenses. In any case, the method according to the invention allows the blocking of lenses on both concave and convex surfaces.

A device suitable for carrying out the method according to the invention for centering and blocking a lens and in particular an eyeglass lens with a block piece thus has a sleeve between the block piece and the glasses, which is attached in such a way that a casting space is specified in which the

Casting material is filled.

Advantageous configurations can be found in the subclaims.

A wide variety of configurations are possible, for example the axis of rotation of the block piece can pass through the optical center of a progressive surface.

The method according to the invention is particularly suitable for the production of progressive prescription recipes.

In each case, the disadvantages described in the introduction are eliminated with the method according to the invention. The process can be fully automated and no more putty rings have to be used. Furthermore, it can be used for all glass diameters and all glass radii.

Another particular advantage is that the

Delays are minimized and the formation of unwanted voids is avoided. The method can also be used for round and non-round lenses. This continues correct blocks in the production of prism, addition, tilt angle and axis position to increase the quality of the finished product.

With the new method, the theoretical optical center, prism, addition, tilt angle and axial position of the glass can be positioned exactly according to the calculated values for the block piece. In this way, imaging errors are reduced or completely eliminated.

Brief description of the drawing

The invention is described below by way of example without limitation of the general inventive concept with reference to the drawing, to which reference is expressly made with regard to the disclosure of all details according to the invention not explained in detail in the text. It shows:

1 shows the principle of the fully automated method for blocking lenses in partial images 1 to 5.

Representation of an embodiment

A lens, for example a spectacle lens 1, is inserted into a receiving device 2, which enables alignment of the spectacle lens 1 both translationally and rotationally relative to a block piece 3 that can only be displaced in the vertical direction. This is shown in sub-images 1 and 2. The alignment can preferably be carried out with a control and evaluation device (not shown) which evaluates the signal from a camera 4, which detects engravings and / or markings on the surface of the spectacle lens 1 to be blocked. The X, Y and Z and the Rotation axes bring the spectacle lens 1 into the calculated position. The holding device 2 can additionally be tilted by actuators.

Due to the freely positionable axes, the glass 1 can be brought into the correct position for receiving and locked for the placement of the block piece 3.

After the block piece 3 has been put on, a flexible sealing sleeve 5 is put on from above, which limits the casting space for the material which connects the block piece 3 to the spectacle lens 1 for the further processing operations (partial picture 3). The cuff 5 seals the casting space on the peripheral edge of the spectacle lens 1. The flexibility of the sealing collar 5 ensures that both spherical and toric and progressive surface geometries are securely sealed. This prevents damage to the transition from the block metal to the lens. The Alloy or other alternative media are filled in through the passage opening in block 3 (drawing 4).

Thanks to the open gate and the material accumulation that runs from the outside inwards, a favorable cooling curve is achieved. The material cools from the outside in. The filling opening in the block piece acts as a riser and can therefore compensate for the shrinkage that would otherwise produce uncontrolled blowholes.

In addition, the risk of handling the toxic block material is reduced. Subsequently, the sleeve 5 is removed, the Bril ¬ lenglas 1 with the attached thereto block piece 3 can then be used in a processing machine (panel 5).

The invention has been described above without restricting the general inventive concept that can be gathered from the claims.

Claims

 PATENT CLAIMS 1. Method for recording or blocking optical Lenses and in particular glasses for further processing steps, such as the processing of a surface that has not yet been completed and / or the processing of the lens edge, with the following method steps: the lens is inserted into a receiving device in such a way that the surface on which the lens is received or ,
 should be blocked, located at the top, - the receiving device with the on-hook The lens is positioned relative to a block that is placed on the surface of the lens to be blocked after positioning and on which the lens is placed in the following Processing steps is held on the provided with a through hole A block is attached to the block piece and the lens in such a way that a casting space which is closed at the side and at the bottom but is open at the top is formed Poured casting material into the casting space, after the casting material has solidified, the blocked lens is removed from the holding device.  <Desc / Clms Page number 12>  
2. The method according to claim 1, characterized in that the cuff on the The peripheral edge of the lens rests, so that the casting material rests or adheres to the entire surface of the blocked surface of the lens.
3. The method according to claim 1 or 2, characterized in that the sleeve is removed after the casting material has solidified.
4. The method according to any one of claims 1 to 3, characterized in that a sensor is used to align the lens or the receiving device.
5. The method according to claim 4, characterized in that a video camera is used as the sensor, which detects the shape, markings and / or engravings on the surface of the lens to be blocked, and its output signal on an evaluation and Control unit for the alignment of the receiving device and / or the block piece detected.
6. The method according to any one of claims 1 to 5, characterized in that a flexible cuff is used as the cuff.
7. The method according to any one of claims 1 to 6, characterized in that a sensor is used, the filling of the casting material in the Through opening of the block piece detected, and  <Desc / Clms Page number 13>  whose output signal is applied to an evaluation and control unit that controls the filling process.
8. The method according to any one of claims 1 to 7, characterized in that a low-melting metal or a metal alloy (alloy) or a wax-like substance is used as the casting material.
9. The method according to any one of claims 1 to 8, characterized in that the lens is aligned translationally and rotationally relative to the block piece, so that the setting of Prisms, cylinder axes or other non-rotationally symmetrical features is possible.
10. The method according to any one of claims 1 to 9, characterized in that the receiving device is positioned relative to the block piece.
11. The method according to any one of claims 1 to 10, characterized in that pre-bordered, d. H. round lenses cannot be blocked.
12. The method according to any one of claims 1 to 11, characterized in that the method is carried out fully automatically.
PCT/DE2003/002557 2002-07-29 2003-07-29 Fully automatic method for blocking optical lenses WO2004015482A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10234628.3 2002-07-29
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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003192953 DE10392953B4 (en) 2002-07-29 2003-07-29 Device for fully automated blocking of optical lenses and fully automated method for blocking optical lenses
AU2003264244A AU2003264244A1 (en) 2002-07-29 2003-07-29 Fully automatic method for blocking optical lenses

Publications (2)

Publication Number Publication Date
WO2004015482A2 true WO2004015482A2 (en) 2004-02-19
WO2004015482A3 WO2004015482A3 (en) 2004-09-23

Family

ID=30128513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002557 WO2004015482A2 (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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004062848A1 (en) * 2003-01-11 2004-07-29 Carl Zeiss Vision Gmbh Method for the parallax-free centring of an optical element and device for carrying out said method
JP2009523484A (en) * 2006-01-13 2009-06-25 ボストン サイエンティフィック リミテッド Fixed placement device
US9381604B2 (en) 2005-08-10 2016-07-05 Schneider Gmbh & Co. Kg Preformed block piece with three points of support
EP2300198B2 (en) 2008-05-09 2018-03-21 Satisloh AG Device for blocking workpieces, particularly spectacle lenses, for the processing and/or coating thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017201288A1 (en) 2017-01-26 2018-07-26 Breitfeld & Schliekert Gmbh Method for positioning a lens

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1541963A (en) * 1966-11-10 1968-10-11 Univis support block for the manufacturing of ophthalmic lenses and manufacturing method using this block
US5695393A (en) * 1994-11-26 1997-12-09 Loh Optikmaschinen Ag Tool for the precision processing of optical surfaces
EP1093907A2 (en) * 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a lens

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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
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
FR2733710B1 (en) * 1995-05-03 1997-07-18 Essilor Int Pre-wheel to the holding device of an optical lens, and its implementation METHOD

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1541963A (en) * 1966-11-10 1968-10-11 Univis support block for the manufacturing of ophthalmic lenses and manufacturing method using this block
US5695393A (en) * 1994-11-26 1997-12-09 Loh Optikmaschinen Ag Tool for the precision processing of optical surfaces
EP1093907A2 (en) * 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a lens

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004062848A1 (en) * 2003-01-11 2004-07-29 Carl Zeiss Vision Gmbh Method for the parallax-free centring of an optical element and device for carrying out said method
US7150528B2 (en) 2003-01-11 2006-12-19 Carl Zeiss Vision Gmbh Apparatus for positioning a semi-finished spectacle lens
US7306334B2 (en) 2003-01-11 2007-12-11 Carl Zeiss Vision Gmbh Method for positioning a semi-finished spectacle lens
US7611242B2 (en) 2003-01-11 2009-11-03 Carl Zeiss Vision Gmbh Method for centering a semifinished spectacle lens blank
US9381604B2 (en) 2005-08-10 2016-07-05 Schneider Gmbh & Co. Kg Preformed block piece with three points of support
JP2009523484A (en) * 2006-01-13 2009-06-25 ボストン サイエンティフィック リミテッド Fixed placement device
EP2300198B2 (en) 2008-05-09 2018-03-21 Satisloh AG Device for blocking workpieces, particularly spectacle lenses, for the processing and/or coating thereof

Also Published As

Publication number Publication date
AU2003264244A8 (en) 2004-02-25
WO2004015482A3 (en) 2004-09-23
DE10392953D2 (en) 2005-04-21
CZ2005126A3 (en) 2005-06-15
AU2003264244A1 (en) 2004-02-25
DE10392953B4 (en) 2009-12-17
CZ304718B6 (en) 2014-09-10
DE10234628A1 (en) 2004-02-12

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