CZ304718B6 - Fully automatic method for blocking optical lenses - Google Patents

Fully automatic method for blocking optical lenses Download PDF

Info

Publication number
CZ304718B6
CZ304718B6 CZ2005-126A CZ2005126A CZ304718B6 CZ 304718 B6 CZ304718 B6 CZ 304718B6 CZ 2005126 A CZ2005126 A CZ 2005126A CZ 304718 B6 CZ304718 B6 CZ 304718B6
Authority
CZ
Czechia
Prior art keywords
optical lens
locking element
method according
characterized
storage device
Prior art date
Application number
CZ2005-126A
Other languages
Czech (cs)
Other versions
CZ2005126A3 (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

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 method of depositing, or blocking, the optical lens (1) and, in particular, the spectacle glass for further processing thereof, such as machining the unfinished surface and / or treating the edge of the optical lens (1), comprises the following steps. The optical lens (1) is inserted into the storage device (2) so 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) positioned thereon is positioned against a 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 deposited during subsequent machining operations on the locking element (3) provided with the through hole; the optical lens (1) is fitted with a sealing collar (5) such that it defines a laterally and downwardly closed but open casting space, the casting space is filled with a casting material through the through hole, and the blocked optical lens is solidified after the casting material has solidified ( 1) is removed from the storage device (2).

Description

Technical field

The invention relates to a method for storing or blocking optical lenses for further processing or manipulation.

BACKGROUND OF THE INVENTION

Optical lenses must be "locked" in professional jargon for the treatment of their unfinished surfaces and / or edges in a defined manner so that further processing operations can be performed correctly 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 first produce a so-called blank, i.e., on the one hand, a finished, circular spectacle glass or spectacle glass with trimmed edges. The so-called receptor surface, usually a concave external surface, is then produced according to the specific order according to the recipe data on the spherical and toric effect, the position of the axes, the prism and the possible addition at multiple optical powers or specific progressive areas. Subsequently or in combination with the production of the surface according to the recipe, the edges of the spectacle glass are then adjusted according to the data of the frames into which the spectacle glass is to be inserted.

Appropriate storage or blocking methods are known in the art: For example only DE-4431880 A1, DE-69604116 T2 or US-PS-3996701 can be referred to. Moreover, those documents are expressly referred to in the case of details which are not explained here.

In most known blocking methods, a plurality of different sealing rings have to be used, which are chosen according to different diameters, thicknesses and combination of curvature of the individual optical lenses. A further disadvantage is that the adjustment of the values (prism, tilt angle axis position, etc.) must be performed separately for each spectacle glass.

Thus, the selection of the sealing rings, the individual settings and the reassortment of the locking rings after their use are made by the person concerned, which can lead to considerable errors due to the human factor.

In addition, non-circular glasses are made, for example, to minimize the critical thickness, treated glasses are provided with modified edges, which must then be used with the smallest permissible blocking ring, which results in such thin glasses partially overhanging and not sufficiently supported during sanding and polishing. During further processing, a transition between the blocking metal and the optical lens occurs on the blocking surface, which in some circumstances may lead to surface deformations.

Spectacle lenses with progressive or other non-rotationally symmetrical surfaces are difficult to block; this is especially true for progressive spectacle lenses with large additions, since in this case an exact fit to the sealing ring cannot be achieved.

A significant source of error is furthermore the comparison or positioning of the blocked optical lenses according to the marks or engravings. These markers 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 results in a closed system. Since no boss is present, the volume loss of the material cannot be compensated for by the refilled material. Lunkers are formed on the glass surface, which can be caused by the action

CZ 304718 Β6 machining forces to cause imprinting on plastic optical lenses. Other sources of error are the manual adjustment of the reference surface on the locking material, the worn cam disc and the wear of the locking pins of the locking element for tilting the sealing ring.

A further drawback of the prior art is that, in addition to the person concerned, other operating personnel also come into contact with the toxic and environmentally incompatible blocking metal. In addition, expensive blocking metal is lost as a result of contact and fracture of the glass fragments and subsequent machining of the reference surface.

In known non-automated processes, the operator inevitably comes into contact with the blocking metal. As a result of the breakage of the glass fragments, an expensive and incompatible blocking metal is lost.

Thus, there is a need for a method of blocking without the use of sealing rings, which increases accuracy and is fully automated. The special behavior of thin plastic lenses, as well as the processing of non-circular spectacle lenses, is also very special.

Also, especially when developing new spectacle lenses, it is important to reduce or even eliminate imaging defects. An imaging defect is understood to mean the displacement of the optical center of the optical lens relative to the central axis of the locking element. In conventional blocking methods according to the prior art, it is generally always blocked with imaging defects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a locking method which does not suffer from the aforementioned drawbacks and which enables the automated and positionally correct positioning of the locking element and the large-area adherence of the casting material without the formation of lunkers or the like.

SUMMARY OF THE INVENTION

The problem is solved and the drawbacks of known solutions of this kind largely eliminate the method of storing or blocking the optical lens and in particular the spectacle glass for further processing operations, such as the treatment of the unfinished area and / or the edge processing 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 mounted or blocked is located at the top,

- the storage device with the optical lens mounted thereon is positioned relative to the locking element which, after positioning, is mounted on the blocked surface of the optical lens and on which the optical lens is deposited during subsequent machining operations,

- a sealing sleeve is mounted on the locking element provided with a through-hole and on the optical lens so as to define a laterally and downwardly closed casting space which is open at the top,

- the casting space is filled from the top through the through hole with casting material,

- after the casting material has solidified, the blocked optical lens is removed from the storage device.

Thus, the method of storing or blocking an optical lens, and in particular spectacle glass, for further processing operations, such as the treatment of an unfinished area and / or edge processing of an optical lens, according to the invention, consists of the following steps:

The optical lens is inserted into the storage device such that the surface on which the optical lens is to be mounted or blocked is located at the top. This insertion into the storage device can be done by a positioning device, for example a manipulator or an industrial robot. There are no great demands on the accuracy of this manipulator, since the positioning of the optical lens is made by the storage device.

-?.

CZ 304718 Β6

The storage device with the optical lens mounted thereon is positioned relative to the locking element, which, after positioning, is mounted on the blocked surface of the optical lens and on which the optical lens is stored during the subsequent processing operations in the individual processing devices. The positioning of the optical lens relative to the locking element preferably takes place translationally and rotationally, so that it is also possible to adjust prisms, cylindrical axes and other non-rotationally symmetrical features. Furthermore, it is advantageous if the locking element is displaceable only in one axis, in a vertical axis, and the storage device is aligned with the locking element with the optical lens.

The locking element can be implemented in a known manner, i.e., it can be provided with a holder for conventional machine tools, which enables the locking element to be oriented together with the optical lens in 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 by defining a casting space which is closed but open at the top and downwardly over the surface of the optical lens. It is preferred that the sealing collar, which is preferably resilient, is mounted on the optical lens from above.

After the sealing collar has been fitted, the casting space is filled from above through a through-hole with a casting material which may be an alloy, for example a low-melting metal alloy or alternatively a blocking metal or possibly wax.

After the casting material has solidified, the blocked optical lens is removed from the storage device and can then be clamped by a locking element in a machine tool such as a grinding machine, a polishing machine, a milling machine, a lathe or an optical lens edge processing machine.

It is particularly advantageous if the sealing collar is applied to the periphery of the optical lens and the casting material abuts and adheres to the blocked surface of the optical lens. In this way an optimum support of the optical lens is achieved, especially when machining thin optical lenses.

In any case, the method according to the invention allows blocking of optical lenses on both concave and convex surfaces.

The sealing sleeve is removed after solidification of the casting material.

The optical lens or storage device is compared using a sensor.

As a sensor, a video camera can be used which senses the shape, marks or engravings on the blocked side of the optical lens and whose output signal is applied to the evaluation and control unit for comparing the storage device and / or the locking element.

The elastic sealing sleeve is preferably used as the sealing sleeve.

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 to the evaluation and control unit for controlling the filling process.

The casting material is preferably a low-melting metal or an alloy or a waxy substance.

The optical lens is compared translationally and rotationally with respect to the locking element, and it is also possible to adjust prisms, cylindrical axes or other non-rotationally symmetrical features.

The storage device is preferably positioned relative to the locking element.

It is also possible to block optical lenses with pre-treated edges, i.e. non-circular optical lenses.

CZ 304718 Β6

Finally, the process according to the invention can be carried out fully automatically.

A device suitable for carrying out a method of centering and blocking an optical lens, in particular a spectacle glass, by means of a blocking element according to the invention is thus provided between the blocking element and the optical lens with a sealing collar which is fitted so as to form a casting space filled with the casting material.

Various embodiments are possible, for example the axis of rotation of the locking element can extend through the center of the progressive surface.

The method according to the invention is particularly suitable for making progressive areas on the eye side according to the recipe.

In any case, the above-described drawbacks of the prior art are eliminated by the method according to the invention. The method can be fully automated and no sealing rings can be used. The method of the invention is also applicable to all diameters and optical powers of optical lenses.

A particular advantage of the method according to the invention is that the deformation of the optical lenses and the formation of undesirable lunkers are minimized. The method of the invention is also applicable to both circular and non-circular optical lenses. Further, positively locking in the manufacture of prisms, allowances, and adjusting the tilt angle and position of the axes leads to an increase in the quality of the final product.

The theoretical optical center, prism, allowances, tilt angle and optical lens axes can also be positioned according to the calculated values with respect to the locking element according to the invention. In this way, imaging defects are minimized or eliminated.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention is further elucidated with reference to the accompanying drawings, in which:

FIG. 1 shows the principle of a fully automatic method of blocking lenses in sub-figures 1 to 5.

DETAILED DESCRIPTION OF THE INVENTION

An optical lens 1, for example a spectacle glass, is inserted into a storage device 2 which 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 shown in sub-figures 1 and 2. The comparison or positioning of the optical lens 1 can advantageously be 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 a calculated position in the direction of the X, Y and Z axes and about the axis of rotation. By means of the adjusting members the storage device 2 can be tilted additionally.

With the free adjustment in all axes, the optical lens can also be placed in the correct position of the fitting and for the insertion of the locking element 3.

After insertion of the locking element 3, a flexible sealing collar 5 is inserted from above, which delimits the casting space for the material by which the locking element 3 is connected for further machining operations with the optical lens i - partial illustration 3. The sealing cuff 5 seals the casting space at the periphery of the optical lens. L The elasticity of the sealing collar 5 ensures that both spherical and toric and progressive surface geometries are reliably sealed. This avoids damage at the transition point between the blocking material and the optical lens i. Filling with the alloy or other alternative media is performed through the through hole in the blocking element 3 (Figure 4).

CZ 304718 Β6

A favorable cooling curve is achieved due to the open inflow and the inward accumulation of material. The material cools from the outside to the inside. The filling opening in the locking element 3 acts as a boss and can thus compensate for the loss of volume which would otherwise lead to uncontrolled lunkers.

In addition, the risk of contact with the toxic blocking material is avoided.

The sealing cuff 5 is then removed and the optical lens 1 together with the locking element 3 arranged thereon - the partial illustration 5 - can be inserted into the machine tool.

The invention has been described above by way of example, without limiting the spirit of the invention which is apparent from the appended claims.

Claims (12)

  1. PATENT CLAIMS
    A method for storing or blocking an optical lens (1) and in particular spectacle glass for further processing operations, such as machining an unfinished surface and / or machining 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 mounted or blocked is located at the top,
    - the storage device (2) with the optical lens (1) stored thereon is positioned relative to the locking element (3) which after positioning is mounted on the blocked surface of the optical lens (1) and on which the optical lens (1) is stored during the following machining operations,
    - a sealing sleeve (5) is fitted on the locking element (3) provided with a through-hole and on the optical lens (1), so as to define a casting space which is closed laterally but downwards,
    - the casting space is filled from the top through the through hole with casting material,
    - after solidification of the casting material, the blocked optical lens (1) is removed from the storage device (2).
  2. 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 adheres to the blocked surface of the optical lens (1).
  3. Method according to claim 1 or 2, characterized in that the sealing sleeve (5) is removed after the casting material has solidified.
  4. 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.
  5. 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 applied to an evaluation and control unit for comparing the storage device (2) and / or the locking element (3).
  6. Method according to one of Claims 1 to 5, characterized in that the sealing collar (5) is a flexible sealing collar.
    - 5 GB 304718 B6
  7. 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 sensed by a sensor whose output signal is fed to the evaluation and control unit for controlling the filling process.
  8. Method according to one of Claims 1 to 7, characterized in that the casting material is a low-melting metal or an alloy or a waxy substance.
  9. Method according to one of Claims 1 to 8, characterized in that the optical lens (1) is aligned translationally and rotationally with respect to the locking element (3) and it is also possible to adjust prisms, cylindrical axes or other non-rotationally symmetrical features.
  10. Method according to one of Claims 1 to 9, characterized in that a bearing device (2) is positioned relative to the locking element (3).
  11. Method according to one of Claims 1 to 10, characterized in that optical lenses (1) with pre-treated edges, i.e. non-circular optical lenses (1), are blocked.
  12. Method according to one of Claims 1 to 11, characterized in that it is carried out fully automatically.
    drawing
    List of reference marks:
    optical lens storage device locking element camera sealing sleeve
    End of document. 7 -
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 CZ2005126A3 (en) 2005-06-15
CZ304718B6 true 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

Citations (4)

* 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
DE1652221A1 (en) * 1966-11-10 1971-03-11 Univis Inc Multi-piece ring mount for lens blanks
DE4431880A1 (en) * 1993-09-07 1995-03-16 Gerber Optical Inc Lens holding apparatus
EP1093907A2 (en) * 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a lens

Family Cites Families (5)

* 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
US3996701A (en) * 1975-06-30 1976-12-14 American Optical Corporation Lens block with preform
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

Patent Citations (4)

* 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
DE1652221A1 (en) * 1966-11-10 1971-03-11 Univis Inc Multi-piece ring mount for lens blanks
DE4431880A1 (en) * 1993-09-07 1995-03-16 Gerber Optical Inc Lens holding apparatus
EP1093907A2 (en) * 1999-10-18 2001-04-25 Prolaser Ltd. A method and apparatus for automatic attachment of a finishing block to a 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
CZ2005126A3 (en) 2005-06-15
AU2003264244A1 (en) 2004-02-25
DE10392953B4 (en) 2009-12-17
DE10234628A1 (en) 2004-02-12

Similar Documents

Publication Publication Date Title
US6953381B2 (en) System and method for ophthalmic lens manufacture
EP0758571B2 (en) process for manufacturing a concave outer surface on a spectacle lens blank
US4980993A (en) Method and apparatus for manufacturing contact lens
US5341604A (en) Single block mounting system for surfacing and edging of a lens blank and method therefor
EP1327496B1 (en) Polishing apparatus
US6142625A (en) Toric multifocal lens having different astigmatism corrective optical powers in respective vision correction regions, and method of producing the same
EP2266754B1 (en) Vacuum chuck for holding a spectacle lens blank
US6813536B1 (en) Method and device for computer numerical control of machining of spectacle lenses
EP0858613B1 (en) Multifocal lens, and method for production thereof
US9254615B2 (en) Method and an apparatus for manufacturing an optical lens
US5148637A (en) Lens edging system with programmable feed and speed control
US5630746A (en) Spectacle lens edge grinding machine
DE10338893B4 (en) Process for the production of spectacle lenses and other optical molded articles made of plastic
JP5198739B2 (en) Apparatus and method for processing optical workpieces, in particular plastic spectacle lenses
US3946982A (en) Adjustable mold for direct casting of plastic multifocal lenses
EP1082625B1 (en) Precision double-sided aspheric element
JP3069650B2 (en) Method of manufacturing a contact lens
EP2266753B1 (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
EP1736280B1 (en) Method and device for producing optical glasses
EP0281754B1 (en) Method and apparatus for making prescription eyeglass lenses
JP2842945B2 (en) Cast molding method of toric contact lenses
US5462475A (en) Blocking system for prescription lenses
US3522677A (en) Method for generating a lens
DE60306066T2 (en) Numerically controlled (NC) machine with integrated grinding unit
US5615588A (en) Apparatus for processing the edge of ophthalmic lenses

Legal Events

Date Code Title Description
MM4A Patent lapsed due to non-payment of fee

Effective date: 20140729