EP0333598B1 - Linsenschleifgerät - Google Patents

Linsenschleifgerät Download PDF

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Publication number
EP0333598B1
EP0333598B1 EP19890400760 EP89400760A EP0333598B1 EP 0333598 B1 EP0333598 B1 EP 0333598B1 EP 19890400760 EP19890400760 EP 19890400760 EP 89400760 A EP89400760 A EP 89400760A EP 0333598 B1 EP0333598 B1 EP 0333598B1
Authority
EP
European Patent Office
Prior art keywords
lens
carriage
cos
grinding apparatus
swing
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
EP19890400760
Other languages
English (en)
French (fr)
Other versions
EP0333598A3 (en
EP0333598A2 (de
Inventor
Nobuhiro Isokawa
Yoshiyuki Hatako
Shinji Uno
Takahiro Watanabe
Yasuo Suzuki
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.)
Topcon Corp
Original Assignee
Topcon Corp
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Filing date
Publication date
Application filed by Topcon Corp filed Critical Topcon Corp
Publication of EP0333598A2 publication Critical patent/EP0333598A2/de
Publication of EP0333598A3 publication Critical patent/EP0333598A3/en
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Publication of EP0333598B1 publication Critical patent/EP0333598B1/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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled

Definitions

  • This invention relates to a lens grinding apparatus according to the preamble of claim 1.
  • a position i.e., a coordinate of the edge of a lens, which was roughly ground and held between two lens rotating shafts of a swingable carriage with respect to a V-groove of a V-beveling or V-edging grinder.
  • a drive shaft 2 disposed within a front portion of a body 1 is secured thereon with a coarse grinder 3 and a V-edging grinder 4 adjacent to each other.
  • a supporting portion 5 is disposed on a rear portion of the body 1.
  • a supporting shaft 6, which is parallel with the drive shaft 2, is rotatably and movably held by the supporting portion 5 for movement in the axial direction thereof.
  • a carriage 7 is secured at a rear end portion thereof to the supporting shaft 6.
  • a pair of lens shafts 8,9, which are parallel with the supporting shaft 6 and coaxial with each other, are rotatably held by a front end portion of the carriage 7.
  • the lens shaft 9 is adjustable as such that it can be moved forward and backward with respect to the lens shaft 8. By tightening the lens shaft 9, an ophthalmic lens L to be ground is fixedly held between the lens shafts 8 and 9.
  • the lens shafts 8,9 can be rotated in synchronism with each other by a pulse motor 10 which is disposed within the carriage 7.
  • the lens shaft 8 is provided with a template 11 removably mounted on one end portion thereof.
  • a pulse motor 12 supported on a frame (not shown) is rotated normally or reversely, a feed screw 13 is rotated.
  • an arm plate 15, which is supported by a guide shaft 14, is reciprocally moved in the longitudinal direction parallel with the lens shafts 8,9 and the supporting shaft 6. Since one end portion of the supporting shaft 6 is rotatably held by the arm plate 15, the carriage 7 is reciprocally moved in the axial direction of the supporting shaft 6 by means of activation of the pulse motor 12 through the arm plate 15.
  • the arm plate 15 is provided with a contact platform 16 vertically and movably held thereby and with a pulse motor 17 mounted thereon and adapted to move the contact platform 16 in the vertical direction.
  • the contact platform 16 comprises a body 16a and a contact piece 16b mounted on the body 16a in such a manner as to be swingable within a predetermined range in the vertical direction about one end thereof.
  • the contact piece 16b is energized upwardly by spring means (not shown).
  • the template 11 is brought to be contact with the platform 16.
  • the lens shafts 8,9 are rotated and the coarse grinder 3 is driven to rotate.
  • the platform 16 is lowered, the lens L is roughly ground into a configuration identical with that of the template 11 by the coarse grinder 3.
  • the lens L which was roughly ground is different in radius vector ⁇ i from the center of rotation thereof to the peripheral surface thereof at each point in the circumferential direction according to the configuration of the template 11. Also, since both refractive surfaces of the lens L are three-dimensional curved-surfaces as shown in Fig. 9, peripheral edges L f , L b of the lens L are changed in the axial direction of the lens shafts 8,9. Therefore, when the edges of the lens L, which was roughly ground as mentioned, is going to be subjected to V-edging treatment, the lateral moving amount of the carriage 7 is required to be controlled according to each radius vector ⁇ i since otherwise an ideal V-edging treatment cannot be applied to the peripheral portion of the lens L.
  • the apparatus as shown in Fig. 9. in which the lens L, which was roughly ground, is moved to position above a V-groove 18 of a V-edging grinder 4 and then, the lens shafts 8,9 are repeatedly lowered by a predetermined amount from position of a predetermined height and the carriage 7 is repeatedly laterally moved by means of the vertical movement of the platform 16 in order to measure a movable coordinate of the carriage 7 in the Y-direction (axial direction of the lens shafts 8,9) when the peripheral edges L f , L b of the lens L are abutted against inclined surfaces 18a, 18b of the V-groove 18 and the thickness of the edge of the lens which can be obtained from the coordinate per radius vector ⁇ i at several places beforehand, thereby to determine the amount of lateral movement of the carriage during the V-edging treatment according to each radius of vector ⁇ i .
  • the abutting force of the peripheral edges L f ,L b of the lens L against the inclined surfaces 18a,18b uses a pivotal moment by the weight of the carriage 7, if the swing angle ⁇ is changed, the abutting force is increased, and therefore, not constant.
  • the abutting force is small enough and always constant under lens grinding pressure, even if the abutting positions are moved in the circumferential direction to change the radius vector ⁇ i at the abutting points.
  • a swing down moment of the carriage is calculated with reference to the swing angle of the carriage when the roughly ground lens is abutted against the V-edging grinder and the radius vector of the lens at that time, and the abutting force adjusting means is drive controlled by the control means as such that a difference between the swing down moment and a swing down preventing moment by the abutting force adjusting means becomes constant.
  • a method for grinding a lens, according to claim 6, is also provided.
  • Fig. 1 is a perspective view of a lens grinder including a device for maintaining abutting pressure against a grinder according to the present invention, in which identical or similar parts of Fig. 8 are denoted by identical reference numerals and description thereof is omitted.
  • a body 1 of the apparatus is provided with a guide shaft 19 extending in a direction parallel with a drive shaft 2 (rotating shaft) of a V-edging grinder 4 and mounted to position (not shown) of a rear portion of the body 1.
  • a carriage base 20 is reciprocally and movably held by the guide shaft 19 in the longitudinally direction thereof.
  • the carriage base 20 is connected with an arm plate 15 and is reciprocally moved in the axial direction of the guide shaft 19 by a pulse motor 12 together with the arm plate 15.
  • the carriage base 20 is provided at both ends in its moving direction with supporting portions 21,21 projecting upward therefrom.
  • a contacting sensor S is interposed between a body 16a of a contact platform 16 and a contact piece 16b. This sensor S employs a detector same to one which is provided to a contact platform of the above-mentioned Japanese patent application and therefore, detailed description thereof will be omitted.
  • the carriage 7 is provided with an abutting force adjusting means 23 mounted on a rear end portion 7a thereof.
  • the abutting force adjusting means 23 includes a pulse motor 24 mounted on the rear end portion 7a, a reduction gear 24a interlocked with the pulse motor 24, a rotating shaft 24b interlocked with the reduction gear 24a, a circular timing plate 25 and a lever 26 mounted on the rotating shaft 24b, and a microswitch 27 mounted on the rear end portion 7a.
  • the timing plate 25 is formed with a V-shaped notch 25a.
  • a roller 27b attached to an actuator lever 27a of the microswitch 27 is abutted against the peripheral surface of the timing plate 25. And, upon engagement of the roller 27b with the notch 25a, the microswitch 26 is switched off.
  • a spring 28 is interposed between the free end portion or lower end portion of the lever 26 and the carriage base 20, a spring 28 is interposed.
  • the timing plate 25 and the microswitch 27 constitute means for detecting a pivot starting position of the lever 26.
  • the abutting force adjusting means 23 is drive controlled by CPU 29 (central processing unit) as a calculation control circuit (control circuit).
  • CPU 29 central processing unit
  • power output from the microswitch 27 and a signal from the contacting sensor S are input.
  • the CPU 29 controls the rotating time of the pulse motor 24 through a timer 30.
  • the CPU 29 calculates the rotation angle of the lens shafts 8,9 in accordance with a drive control pulse signal of the pulse motor 10 during rough grinding treatment of the lens and stores the same therein. An electric power is fed to the pulse motor 24 through the timer 30 when the timer 30 is being activated.
  • the CPU 29 employs a measuring device as disclosed in the above-mentioned Japanese patent application in order to measure a positional coordinate of the peripheral edge of the roughly ground lens L in such a manner as that a radius vector ⁇ i of the lens L abutted against the V-edging grinder 4 is found in accordance with the shaft rotation angle of the lens shafts 8,9 and a swing angle ⁇ of the carriage 7, when the roughly ground lens L is abutted against the V-edging grinder 4 in this radius vector position, is calculated based on such obtained radius vector ⁇ i and a known carriage arm length.
  • the CPU 29 determines the operating time of the timer 30 and the current feeding direction to the pulse motor 24, thereby to allow the timer 30 to control the current feeding time to the pulse motor 24 and the current feeding direction.
  • the controlling of the current feeding time and the current feeding direction by the timer 30 is started from a position where the microswitch 27 is switched off due to engagement of the roller 27 with the notch 25a and is performed as such that a difference between a swing down moment by weight of the carriage acted on the abutting portion from the swing angle ⁇ of the carriage 7 and a pivot down preventing moment by the spring 28 becomes constant.
  • the driving time of the pulse motor 24 is determined by the operating time of the timer 30, it may be designed as such that the number of drive pulse of the pulse motor 24 is found through the above calculation and such found number of drive pulse is input into the pulse motor 24 from the CPU 29 so as to drive control the pulse motor 24 directly by the CPU 29.
  • Fig. 5 shows a case where the carriage 7 is in its horizontal position and where the swing angle thereof is zero.
  • the lens grinding radius vector is denoted by ⁇ o
  • the pulse motor is controlled as such that the lever is brought to its downwardly vertical position.
  • Fig. 6 shows a case where the radius vector ⁇ i is ⁇ 1 which is larger than ⁇ o .
  • Fig. 7 shows a case where the grinding radius vector ⁇ i is ⁇ 2 which is smaller than ⁇ o .
  • a swing angle detecting rotary encoder RE may be provided as shown by the broken line of Fig. 1.
  • the present invention is not necessarily limited to this.
  • a spring mounting member is movably mounted on the rear end portion 7a of the carriage 7 in such a manner as to move forward and backward with respect to the front end portion of the carriage 7, so that the upper end portion of the spring 28 is held by the spring mounting member and the spring mounting member is controlled by a pulse motor, a cylinder or the like in such a manner as to move forward and backward with respect to the front end portion of the carriage 7.
  • the lens grinding apparatus comprises a carriage base having the supporting shaft and reciprocally movably mounted on the body in such a manner as to be moved in a direction parallel with the rotating shaft, a resilient member mounted at one end thereof on either a rear end portion of the carriage or the carriage base, abutting force adjusting means interposed between the rear end portion of the carriage or the carriage base, on which the resilient member is not mounted, and the other end of the resilient member, and control means for calculating a swing down moment of the carriage with reference to a swing angle of the carriage about the supporting shaft when the lens, which was roughly ground, is abutted against the V
  • the abutting force of the peripheral edge of the roughly ground lens against the V-edging grinder can be made smaller enough than the grinding pressure during the lens grinding treatment.
  • this controlling may be utilized not only in a case where the peripheral edge is abutted and measured but also in a case where the grinding pressure during the lens grinding treatment is adjusted.
  • the present invention employs a method for changing the position of the operating point of a spring, the adjusting device becomes small and easy to handle. Furthermore, it is of energy saving type.
  • the adjusting range of the carriage pivot preventing moment can be taken large and one adjusting mechanism can be used both for adjusting the abutting force during the measurement of the thickness of the peripheral edge of a lens and for adjusting the grinding pressure during the grinding treatment of a lens.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (7)

  1. Linsenschleifgerät, enthaltend
    - einen V-Kantenschleifer (4), der drehbar in einem Körper (1) des Gerätes angebracht ist;
    - eine Schlittenbasis (20) mit einer Stützwelle (22), die hin- und herbewegbar in der Weise auf dem Körper (1) montiert ist, daß sie parallel zu einer Drehwelle (2) bewegbar ist;
    - einen schwenkbar parallel zur Drehwelle (2) des V-Kantenschleifers (4) von der Stützwelle (22) in der Weise getragenen Schlitten (7), daß er um die Drehwelle (2) schwenkbar ist und geeignet ist, eine zu schleifende Linse (L) mit einer Linsendrehwelle (8,9) hiervon zu halten; und
    - Mittel (4,8,9,10,12,16,17) zum Messen eines Radienvektors (ρi) der Linse (L);
    dadurch gekennzeichnet, daß
    - das Linsenschleifgerät ein elastisches Glied (29) aufweist, daß mit dem einen Ende entweder an einem hinteren Endbereich (7a,7a) des Schlittens (7) oder an der Schlittenbasis (20) befestigt ist;
    - Anlagekraft-Einstellmittel (23) in der Lage sind, den Angriffspunkt (f) der auf den Schlitten (7) einwirkenden Federkraft (Fo) zu versetzen, die zwischen entweder dem hinteren Endbereich (7a,7a) des Schlittens (7) oder der Schlittenbasis (20), an denen das elastische Glied (28) nicht befestigt ist, und dem anderen Ende des elastischen Gliedes (28) angeordnet sind; und
    - Steuermittel (29) ein nach unten gerichtetes Schwenkmoment (W,W cos ϑ) des Schlittens (7) berechnen mit Bezug auf einen Schwenkwinkel (ϑ) des Schlittens (7) um die Stützwelle (2), wenn die grob geschliffene Linse (L) am V-Kantenschleifer (4) anliegt, und den Radiusvektor (ρi) der Linse (L) zu dieser Zeit, und den Antrieb der Anlagekraft-Einstellmittel (23) steuert, derart, daß
    eine Differenz zwischen diesem nach unten gerichteten Schwenkmoment (Wo,Wo cos ϑ) und einem das Schwenken nach unten verhindernden Moment (Fo,F, cos ϑ,F, cos ϑ', F₂ cos ϑ, Fe cos ϑ') durch die Anlagekraft-Einstellmittel (23) konstant ist.
  2. Linsenschleifgerät nach Anspruch 1, dadurch gekennzeichnet, daß ein Drehkodierer (RE) zwischen der Stützwelle (22) und dem Schlitten (7) zur Bestimmung des Schwenkwinkels (ϑ) angeordnet ist.
  3. Linsenschleifgerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Anlagekraft-Einstellmittel (23) einen am hinteren Endbereich (7a) des Schlittens (7) befestigten Impulsmotor (24) und einen am Schlitten (7) befestigten und durch den Impulsmotor (24) schwenkbaren Hebel (26) aufweisen, wobei der Hebel (26) an einem freien Endbereich mit dem elastischen Glied (28) versehen ist.
  4. Linsenschleifgerät nach Anspruch 3, dadurch gekennzeichnet, daß Anfangsschwenkpositions-Erfassungsmittel (25,27) vorgesehen sind zur Erfassung einer Anfangsschwenkposition (25a) des Hebels (26).
  5. Linsenschleifgerät nach Anspruch 4, dadurch gekennzeichnet, daß die Anfangsschwenkpositions-Erfassungsmittel (25,27) eine Taktgeberscheibe (25), die auf einer mit dem Impulsmotor (24) verriegelten Drehwelle (24b) befestigt und in einem Umfangsbereich mit einer Nut (25a) versehen ist, und einen Mikroschalter (27) aufweist, der in der Weise auf dem Schlitten (7) befestigt ist, daß er benachbart der Taktgeberscheibe (25) ist, und wobei eine Rolle (27b) an einem vorderen Ende eines Betätigungshebels (27a) von diesem an der Umfangsfläche der Taktgeberscheibe (25) anliegt.
  6. Verfahren zum Schleifen einer zu schleifenden Linse (L), das bei einem Linsenschleifgerät nach Anspruch 1 angewendet wird, welches enthält: einen Schritt zur Berechnung eines nach unten gerichteten Schwenkmoments (Wo,Wo cos ϑ) des Schlittens (7) mit Bezug auf einen Schwenkwinkel (ϑ) des Schlittens um die Stützwelle (2), wenn die grob geschliffene Linse (L) am V-Kantenschleifer (4) anliegt, und den Radiusvektor (ρi) der Linse (L) zu dieser Zeit, und zur Steuerung des Antriebs der Anlagekraft-Einstellmittel (23) derart, daß eine Differenz zwischen dem nach unten gerichteten Schwenkmoment (Wo,Wo cos ϑ) und einem das Schwenken nach unten verhindernden Moment (Fo,F,cos ϑ',F₂ cos ϑ, Fe cos ϑ') durch die Anlagekraft-Einstellmittel (23) konstant ist.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Schwenkwinkel (ϑ) mit Bezug auf den Radiusvektor (ρi) der Linse (L) und einen Schwenkdurchmesser (A) des Schlittens (7) berechnet wird.
EP19890400760 1988-03-18 1989-03-17 Linsenschleifgerät Expired - Lifetime EP0333598B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6483588A JPH0796185B2 (ja) 1988-03-18 1988-03-18 玉摺機砥石へのレンズ定圧当接装置
JP64835/88 1988-03-18

Publications (3)

Publication Number Publication Date
EP0333598A2 EP0333598A2 (de) 1989-09-20
EP0333598A3 EP0333598A3 (en) 1990-12-27
EP0333598B1 true EP0333598B1 (de) 1993-07-28

Family

ID=13269702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400760 Expired - Lifetime EP0333598B1 (de) 1988-03-18 1989-03-17 Linsenschleifgerät

Country Status (3)

Country Link
EP (1) EP0333598B1 (de)
JP (1) JPH0796185B2 (de)
DE (1) DE68907757T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19616536C2 (de) * 1996-04-25 2000-01-27 Wernicke & Co Gmbh Verfahren und Brillenglasrandschleifmaschine zum Formschleifen des Umfangsrandes von Brillengläsern und ggf. zum anschließenden Facettenschleifen
CN116944962B (zh) * 2023-09-08 2026-02-27 杭州电子科技大学浦江微电子与智能制造研究院有限公司 一种基于力位融合的水晶加工方法及装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962821A1 (de) * 1969-12-15 1971-06-16 Textron Inc Vorrichtung zum Zurichten von aufgebockten Linsenrohlingen
JPS6049545B2 (ja) * 1982-04-16 1985-11-02 株式会社工研 レンズ加工機
JPS60123259A (ja) * 1983-12-02 1985-07-01 Nippon Kogaku Kk <Nikon> レンズ周縁加工機

Also Published As

Publication number Publication date
JPH01252349A (ja) 1989-10-09
DE68907757T2 (de) 1994-02-24
EP0333598A3 (en) 1990-12-27
JPH0796185B2 (ja) 1995-10-18
EP0333598A2 (de) 1989-09-20
DE68907757D1 (de) 1993-09-02

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