EP0561186B1 - Verfahren zum Formschleifen des Umfangs eines Brillenglases - Google Patents

Verfahren zum Formschleifen des Umfangs eines Brillenglases Download PDF

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Publication number
EP0561186B1
EP0561186B1 EP93102920A EP93102920A EP0561186B1 EP 0561186 B1 EP0561186 B1 EP 0561186B1 EP 93102920 A EP93102920 A EP 93102920A EP 93102920 A EP93102920 A EP 93102920A EP 0561186 B1 EP0561186 B1 EP 0561186B1
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EP
European Patent Office
Prior art keywords
spectacle lens
grinding
periphery
lens
grinding wheel
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP93102920A
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German (de)
English (en)
French (fr)
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EP0561186A1 (de
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wernicke and Co GmbH
Original Assignee
Wernicke and Co GmbH
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Filing date
Publication date
Application filed by Wernicke and Co GmbH filed Critical Wernicke and Co GmbH
Publication of EP0561186A1 publication Critical patent/EP0561186A1/de
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Publication of EP0561186B1 publication Critical patent/EP0561186B1/de
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Classifications

    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B24B47/225—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation for bevelling optical work, e.g. lenses

Definitions

  • the invention relates to a method for shape grinding the circumference of a spectacle lens and for scanning the space curve and the thickness of the shape-ground spectacle lens circumference.
  • German patent 38 42 601 by the same applicant there is a computer-controlled spectacle lens edge grinding machine with the spectacle lens between half waves and a circumferential grinding wheel processing the lens circumference, and with a probe head measuring the lens circumference in relation to the space curve and the lens thickness, which is connected to a computer , described.
  • the probe has fork-shaped arms that are parallel to each other and parallel to the grinding wheel plane, which are arranged at a distance approximately corresponding to the width of the grinding wheel.
  • the half-waves with the spectacle lens or the grinding wheel with the probe perform oscillating back and forth movements, which either carry out a constant amplitude of a minimum size corresponding to the distance between the legs or oscillating back and forth movements, the amplitude size of which determines the respective contact of the spectacle lens on the legs are, the the distance traveled is measured either directly or over the time period of the reciprocating movement of the spectacle lens or grinding wheel between a fixed reference plane and the reversal points of the reciprocating movement.
  • the half-waves that hold the spectacle lens between themselves continuously or step-wise continue to rotate during the grinding process, even if the spectacle lens is in contact with one leg of the probe in the region of the edge of the grinding wheel.
  • the measured values are falsified. This can be due to the fact that the point of contact between the circumference of the lens and the probe does not occur at the point where the lens rests on the grinding wheel due to the clamshell and, on the other hand, that when the half-waves continue to rotate with the lens during contact with the probe already a considerable change in thickness or change in the space curve of the front or back of the lens results.
  • the invention has for its object to provide a method for shaping the circumference of a spectacle lens and for scanning the space curve and the thickness of the shape-ground spectacle lens, which avoids measurement errors, especially in the case of very thick glasses with a lot of clamshell and requires as few measuring points as possible.
  • the shaping of the spectacle lens circumference in the central region of the grinding wheel is carried out by rotating the half-waves with the spectacle lens and changing the relative spacing of the axes of the half-waves and the grinding wheel, the rotation of the spectacle lens stopped when a measuring point is reached, the spectacle lens is displaced axially relative to the grinding wheel from the middle region to the two edges of the grinding wheel until the front and back of the spectacle lens circumference are touched by the probe, the path or the time from the middle region to the contact with the probe is recorded, the measured values are stored in the computer, the half-waves are rotated further with the spectacle lens, and the circumference of the spectacle lens is ground until the next measuring point is reached, and the rotation of the half-waves is continued with the spectacle lens to record the measured values s at least one complete revolution of the half-waves has ended with the spectacle lens.
  • the measurement is carried out when the spectacle lens held by the half-waves is at a standstill, and the axial displacement of the spectacle lens relative to the grinding wheel from the central region to the two edges of the grinding wheel, up to Touching the front and back of the lens periphery with the probe results in a point-by-point scanning of the lens periphery, which cannot be falsified by rotating the lens nor by running the lens periphery on the probe finger of the probe in a peripheral region of the lens distant from the measuring point.
  • the measuring method it is possible to define characteristic measuring points on the periphery of the spectacle lens according to the selected lens shape and the optical and decentration values of the spectacle lens and to limit it to six to ten measuring points.
  • the measuring points can be placed in the area of the reversal points of the lens circumference, which are determined by the computer depending on the selected lens shape and the optical and decentration values of the lens using the grinding program, after which the grinding process is controlled accordingly.
  • the position of a roof facet to be ground on the periphery of the spectacle lens or one can be determined in the computer by means of the measured values recorded in this way during peripheral grinding
  • This position optimization is always advantageous when it comes to glasses with high diopter numbers and / or peripheral contours that deviate greatly from the circular shape.
  • the aim is to let the roof facet or groove run near the front of the lens in order to avoid an aesthetically disadvantageous protrusion of the front of the lens over the lens frame.
  • the position of the roof facet or the groove must be optimized in order to avoid that it leaves the area of the lens periphery between the spatial curve of the front and the rear, which would interrupt the roof facet or the circumferential groove.
  • a rotatable and possibly axially displaceable shaft 1 rotatably supports a grinding wheel 2 and sets it in rotation.
  • Two parallel support strips 3, 4 are provided on both sides of the grinding wheel 2 on a wall of a machine housing, not shown, which merge into approximately vertical additional support strips 5, 6.
  • a fork-shaped probe 7 is arranged, which consists of a web 8 and two parallel fork legs 9, 10, which are at a distance from the approximate width of the grinding wheel 2 from each other.
  • the fork legs 9, 10 can have a shape adapted to the grinding wheel circumference.
  • a spectacle lens 11 is held in a known manner between two half-shafts 14, 15 of the machine and is set in slow rotation by this.
  • a template 16 or a circular disk is rotatably attached, which is supported on a support part 17. Since the lens edge grinding machine is preferably computer-controlled, the support part 17 can be moved up and down by the machine control in accordance with a preselected shape of the lens. In this case, a circular disc 16 must be used to transmit the movement of the support member 17 to the lens 11.
  • the spectacle lens 11 rests with its circumference 12 the grinding wheel 2, wherein it rotates slowly, while the grinding wheel 2 with rapid rotation carries out the shaping of the circumference of the spectacle lens in accordance with either a predefined template 16 or a contour predefined by the computer through the movement of the support part 17.
  • the contour of the spectacle lens is ground in the central region of the grinding wheel 2 between the grinding wheel edges 19, 20.
  • the spectacle lens 11 touches the grinding wheel at a contact point 18. This contact point 18 becomes a predetermined measuring point at which the rotation of the spectacle lens 11 stops and the spectacle lens 11 is axially displaced relative to the grinding wheel 2. This axial displacement takes place on both sides in the direction of the grinding wheel edges 19, 20 until they come into contact with the fork legs 9, 10.
  • an electrical signal is fed to the machine control or the computer, which reverses the movement effected in the direction of the center of the grinding wheel and measures the distance traveled.
  • FIG. 2 shows the sequence of the shape grinding of the circumference of the spectacle lens 11 and the scanning of the space curve and the thickness of the shape-ground spectacle lens circumference.
  • the spectacle lens 11 is set in slow rotation by the half shafts 14, 15 and thereby covers a path corresponding to a circumferential section u 1.
  • the rotation of the half-waves 14, 15 and the spectacle lens 11 is now stopped. While the rotation of the spectacle lens 11 is at a standstill, the latter becomes relative moved to the grinding wheel 2 in the direction of the grinding wheel edges 19, 20. It is assumed that the spectacle lens 11 has a thickness d 1 at this point and the position shown relative to the center plane of the grinding wheel 2.
  • a path a 1.1 is therefore covered until the back 13.2 of the spectacle lens 11 touches the fork leg 9 in the region of the spectacle lens circumference 12.
  • the axial relative movement between the spectacle lens 11 and the grinding wheel 2 is reversed until the front 13.1 touches the fork leg 10 in the region of the spectacle lens circumference 12.
  • the axial movement is then reversed again in the opposite direction until the spectacle lens 11 has returned to its central position with respect to the central plane of the grinding wheel 2.
  • the eyeglass lens 11 held by the half-shafts 14, 15 is again set in slow rotation until a path corresponding to the circumferential section u 2 has been covered, whereupon the axial displacement is repeated with simultaneous measurement of the distances covered a 2.1 and a 2.2 , whereby the of the paths a 1.1 and a 1.2 because of the different thickness d2 of the glasses at this measuring point and the different relative position of the front 13.1 and the back 13.2 are different from the previous measuring point.
  • the peripheral contour of the spectacle lens has ended in accordance with the control by the template 16 or the support part 17 and the value pairs a 1.1 , a 1.2 , a 2.1 , a 2.2 etc. are stored in the computer. From these The computer calculates pairs of values, the respective thickness of the lens d 1, d 2, etc. and the course of the space curve of the front 13.1 and the back 13.2 of the lens.
  • the peripheral sections u1, u2 etc. can have a different length with the same angle of rotation of the lens 11 or the same or different length with different angles of rotation of the lens 11.
  • the angle of rotation by which the spectacle lens 11 is rotated until a measurement is carried out again depends on the spectacle lens to be ground, the contour and the optical and decentration values of the spectacle lens, which are entered into the computer before the peripheral grinding.
  • the computer can then, if it is programmed accordingly, calculate the characteristic measuring points on the periphery of the spectacle lens and control the spectacle lens edge grinding machine accordingly.
  • the spectacle lens 11 does not rotate during the measurement process, there is only a point of contact in the area of the point of contact 18 between the grinding wheel 2 and the spectacle lens 11 with the fork legs 9, 10, so that there is no fear of falsification of the measured values due to a strong muddling of the spectacle lens, which occurs in particular in the case of very thick glasses. Likewise, no errors occur due to a peripheral area of the spectacle lens 11 running onto one of the fork legs 9, 10 in an area which is distant from the contact point 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
EP93102920A 1992-03-19 1993-02-25 Verfahren zum Formschleifen des Umfangs eines Brillenglases Expired - Lifetime EP0561186B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208835 1992-03-19
DE4208835A DE4208835A1 (de) 1992-03-19 1992-03-19 Verfahren zum Formschleifen des Umfangs eines Brillenglases

Publications (2)

Publication Number Publication Date
EP0561186A1 EP0561186A1 (de) 1993-09-22
EP0561186B1 true EP0561186B1 (de) 1995-10-11

Family

ID=6454465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102920A Expired - Lifetime EP0561186B1 (de) 1992-03-19 1993-02-25 Verfahren zum Formschleifen des Umfangs eines Brillenglases

Country Status (4)

Country Link
US (1) US5538459A (enrdf_load_stackoverflow)
EP (1) EP0561186B1 (enrdf_load_stackoverflow)
JP (1) JP2694102B2 (enrdf_load_stackoverflow)
DE (2) DE4208835A1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537855C2 (de) * 1994-10-19 1998-01-29 Schaeffler Waelzlager Kg Verfahren zum Winkelpositionieren einer Steuerbuchse eines Drehschieberventils für Hydrolenkungen
JPH09277148A (ja) * 1996-04-17 1997-10-28 Topcon Corp レンズ周縁研削方法及びその装置
DE19702287C2 (de) * 1997-01-23 1999-02-11 Wernicke & Co Gmbh Verfahren zum Ermitteln des Facettenverlaufs auf dem Rand von formzubearbeitenden Brillengläsern und zum Steuern des Formbearbeitens entsprechend dem ermittelten Facettenverlauf
DE19804542C5 (de) * 1998-02-05 2009-04-30 Wernicke & Co Gmbh Verfahren und Vorrichtung zum Bearbeiten von Brillengläsern
FR2784920B1 (fr) * 1998-10-22 2001-01-19 Essilor Int Procede pour la determination de la trajectoire de la rainure a usiner sur la tranche d'un verre destine a equiper une monture de lunettes de type "semi-glace"
FR2870471B1 (fr) * 2004-05-18 2006-08-25 Briot Internat Sa Procede de rainage ou de contre-biseautage de la peripherie d'une lentille ophtalmique
CN108081066B (zh) * 2017-12-14 2019-06-18 浙江理工大学 玻璃花边磨削方法
CN110355640B (zh) * 2019-07-18 2021-06-15 株洲晶彩电子科技有限公司 一种lcd自动磨边机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2543039B1 (fr) * 1983-03-22 1985-08-09 Essilor Int Procede pour le biseautage d'une lentille ophtalmique, et machine a meuler automatique correspondante
JPS60123259A (ja) * 1983-12-02 1985-07-01 Nippon Kogaku Kk <Nikon> レンズ周縁加工機
US4638601A (en) * 1985-11-04 1987-01-27 Silicon Technology Corporation Automatic edge grinder
DE3842601A1 (de) * 1988-12-17 1990-07-05 Wernicke & Co Gmbh Brillenglasrandschleifmaschine
JPH0816611B2 (ja) * 1989-11-15 1996-02-21 株式会社トプコン レンズのコバ厚測定方法およびそのための装置
FR2682628B1 (fr) * 1991-10-21 1996-01-05 Buchmann Optical Eng Perfectionnements aux machines a meuler et a biseauter les verres ophtalmiques.

Also Published As

Publication number Publication date
DE59300726D1 (de) 1995-11-16
JP2694102B2 (ja) 1997-12-24
US5538459A (en) 1996-07-23
DE4208835A1 (de) 1993-09-30
DE4208835C2 (enrdf_load_stackoverflow) 1994-02-10
EP0561186A1 (de) 1993-09-22
JPH0611412A (ja) 1994-01-21

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