CA2265723C - Improvements in or relating to variable focus lenses - Google Patents
Improvements in or relating to variable focus lenses Download PDFInfo
- Publication number
- CA2265723C CA2265723C CA002265723A CA2265723A CA2265723C CA 2265723 C CA2265723 C CA 2265723C CA 002265723 A CA002265723 A CA 002265723A CA 2265723 A CA2265723 A CA 2265723A CA 2265723 C CA2265723 C CA 2265723C
- Authority
- CA
- Canada
- Prior art keywords
- rings
- ring
- variable focus
- focus lens
- cavity
- 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 - Fee Related
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
Abstract
A variable focus lens comprises first and second transparent, flexible membranes (2) which are tensioned and which define a cavity (30) in which a transparent, silicone oil (4) is sealed. Adjustment of the pressure or volume of the oil in the cavity changes the focal length of the lens. To fabricate the lens, the periphery of each membrane (2 ) is engaged between two rings (8, 10; 10, 12) of a set of three interengaging rings (8, 10, 12). The interengaged rings are crimped together to tension the membranes (2) and seal the cavity (30).
Description
wo .98/114581520253035CA 02265723 l999-03- l2PCT/GB97/02427IMPROVEMENTS IN OR RELATING TO VARIABLE FOCUS LENSESThe present invention relates to a method of fabricating a variable focuslens and to the variable focus lens so constructed.It is known to provide a variable focus lens in which one or moretransparent ï¬exible membranes are tensioned to deï¬ne a cavity therebetween inwhich a transparent ï¬uid is received. Adjustment of the pressure and/or volumeof the ï¬uid in the cavity causes variations in the shape of the membranes, andthe structure deï¬nes a lens of variable focal length.However, whilst it is known to use such a construction to provide avariable focus lens, no current proposals for fabricating such a lens provide alightweight structure which can easily be incorporated into spectacles, forexample.The present invention seeks to provide a new method of fabricating avariable focus lens and to provide a new structure for such a lens.According to a ï¬rst aspect of the present invention there is provided amethod of fabricating a variable focus lens comprising the steps of interengagingï¬rst and second rings to engage a ï¬rst transparent, ï¬exible membrane and toretain said ï¬rst ï¬exible membrane across the ï¬rst ring, interengaging a third ringwith said ï¬rst and second rings to engage a second transparent, ï¬exiblemembrane and to retain said second ï¬exible membrane across the ï¬rst ring,whereby the ï¬rst and second ï¬exible membranes deï¬ne a cavity therebetween,and holding said ï¬rst, second and third rings together such that said ï¬rst andsecond ï¬exible membranes are each tensioned across said ï¬rst ring.A method of an embodiment of the invention enables a variable focuslens to be assembled quickly and easily.A transparent ï¬uid is to be sealed within the cavity deï¬ned between thetwo ï¬exible membranes. in an embodiment, a duct is provided through saidrings, which duct is in communication with said cavity. The duct may be formedfrom pre-formed bores in said ï¬rst, second and third rings. However, in awo 98/1145815202530CA 02265723 l999-03- l2PCT/GB97/02427preferred embodiment, said duct is drilled, or othenivise formed, through saidrings.In an embodiment said ï¬rst ring receives said second and third ringstherein and deï¬nes the periphery of a peripheral, annular frame for the lens,which annular frame is deï¬ned by said ï¬rst, second and third rings. This annularframe may readily be supported within lens apertures provided in spectacles, forexample.The peripheral shape of the peripheral annular frame, and hence of theindividual rings, may be chosen as is required. For example, the annular framemay have a circular, oval, elliptical, or other closed curve, peripheral shape.Any method for holding the ï¬rst, second and third rings together to retainthe ï¬exible membranes under tension may be used.in a preferred embodiment, the method further comprises turning,crimping or otherwise deforming the ï¬rst ring so that the second and third ringsare retained within said ï¬rst ring.Additionally and/or alternatively, said annular frame may be retainedwithin the frame of a pair of spectacles. In this case, the frame of the spectaclesmay act to hold the ï¬rst, second and third rings together. Of course, any otherretaining means may additionally and/or alternatively be provided to secure theï¬rst, second and third rings in their interengaged position.According to a further aspect of the present invention there is provided avariable focus lens having a cavity containing a transparent ï¬uid deï¬nedbetween ï¬rst and second transparent, ï¬exible membranes, wherein each of saidï¬rst and second ï¬exible membranes is tensioned across and held by aperipheral annular frame, and wherein said annular frame is formed from ï¬rst,second and third interengaged rings, said ï¬rst ring receiving the second andthird rings therein and deï¬ning the periphery of said annular frame.W0 98/1 1458I015202530CA 02265723 l999-03- l2PCT/GB97/02427A variable focus lens of an embodiment of the invention is simple andrelatively inexpensive to assemble. Furthermore, the lens may be supportedreadily within the lens aperture in a pair of spectacles, for example.The peripheral shape of the peripheral annular frame, and hence of theindividual rings, may be chosen as is required. For example, the annular framemay have a circular, oval, elliptical, or other closed curve. peripheral shape.Any method for holding the ï¬rst, second and third rings together to retainthe ï¬exible membranes under tension may be used.In an embodiment, the annular frame is arranged to be retained within theframe of a pair of spectacles. In this case, the frame of the spectacles may actto hold the ï¬rst, second and third rings together. Of course, any other retainingmeans may additionally and/or alternatively be provided to secure the ï¬rst,second and third rings in their interengaged position.lt is important that the transparent ï¬uid within said cavity cannot leak.Accordingly, it is preferred that the interengagements between said rings causethe periphery of an appropriate ï¬exible membrane to change direction more thanonce. This aids in sealing the periphery of the cavity.It would be possible to construct the lens from a single ï¬exible membraneweb appropriately arranged to deï¬ne two ï¬exible membranes. However, in apreferred embodiment, two separate ï¬exible membranes are provided with theperiphery of the ï¬rst ï¬exible membrane being held by the interengagement ofthe ï¬rst and second rings, and the periphery of the second ï¬exible membranebeing held by the interengagement of the second and third rings. This providesa simple, yet effective sealed structure for the cavity.Each of said ï¬rst and second membranes has a continuous peripherywhich is held by the respective rings so that it is bent to change direction morethan once.wo §8l1l4582030CA 02265723 l999-03- l2PCT/GB97/02427Preferably, each of two adjacent rings has a complementary annular steptherein for interengaging the two rings. said interengaged steps also guiding aninterposed ï¬exible membrane around two direction changes.In a preferred embodiment. each of said ï¬rst and second ï¬exiblemembranes is of high grade Mylar.The ï¬rst, second and third rings may be of any suitable material.Preferably, each of the rings is of a material which is sufficiently rigid topositively interengage with the adjacent ring and to ensure that twointerengaged rings can maintain the ï¬exible membrane undertension. Thematerial of the rings is also required to be lightweight to facilitate theincorporation of lenses of the invention in spectacles. Thus, the rings may bemade, for example, of a high impact resistant plastics material, or of aluminium,or of titanium.The transparent ï¬uid retained within the cavity may be any suitable ï¬uid.In a preferred embodiment, the ï¬uid is a silicone oil, for example, an oil of thesilicone 703 type.in a preferred embodiment, the lens is additionally provided with twospaced, substantially parallel sheets of transparent polycarbonate betweenwhich the cavity deï¬ned by the ï¬exible membranes is arranged. Thepolycarbonate sheets provide protection to the ï¬exible membranes and arereadily tinted, for example, if required. The annular frame may also be receivedbetween the polycarbonate sheets if required.Embodiments of the present invention will hereinafter be described, byway of example, with reference to the accompanying drawings, in which:Figure 1 shows an axial section of a portion of a variable focus lens of theinvention during construction thereof, andFigure 2 shows a section similar to that of Figure 1 but showing thecompleted lens.W0 98/1 14581520253035CA 02265723 l999-03- l2PCT/GB97l02427The lens described and illustrated herein may be utilised in an opticalapparatus constructed and arranged to be adjusted as described and claimed inInternational application No. WO 96/38744.The lens shown in Figure 2 comprises first and second transparent,ï¬exible membranes 2 which are tensioned and which deï¬ne therebetween acavity 30 in which a transparent ï¬uid 4, such as silicone oil, is contained. In theembodiment illustrated the membranes 2 are of Mylar, for example, 23pm TypeD Mylar.The membranes 2 are held in tension by way of a peripheral annularframe 6. The frame 6 defines the periphery of the lens, and of the cavity 30, andis arranged to hold the ï¬exible membranes 2 under tension. The frame 6 is alsoarranged to seal the lens.As can be seen from Figure 1, the annular frame 6 is formed byinterengaging ï¬rst, second and third rings 8, 10, 12 of aluminium. In thisrespect, the ï¬rst ring 8 has a radially extending ï¬ange 14 which is stepped asindicated at 16. The ï¬rst ring 8 also has an axially extending rim 18. Thesecond ring 10 has a radially outwardly projecting portion 20 deï¬ning a first step22 which cooperates with the step 16 of the first ring 8 and a second step 24which cooperates with a step 26 of the third ring 12. The third ring 12 has arecess 28 arranged radially outwardly therein.Where the completed lens is to have a generally circular periphery, forexample, a ï¬rst membrane 2, which is circular, is positioned to extend within theï¬rst ring 8 such that its periphery extends along the radial ï¬ange 14 thereof.The second ring 10 is then supported within the ï¬rst ring 8 such that thecomplementary steps 16 and 22 thereof interengage. This interengagementpositions the second ring 10 relative to the ï¬rst ring 8. The interengagementalso bends the peripheral circumference of the ï¬rst membrane 2 through twodifferent directions as is clearly shown in Figure 1.A second circular membrane 2 is then positioned across the ï¬rst ring 8such that its periphery extends along the upper radially extending surface of thesecond ring 10. Thereafter, the third ring 12 is positioned such that the steps 24woâ9s/11453101520253035CA 02265723 l999-03- l2PCT/GB97/02427and 26 of the second and third rings 10, 12 cooperate to retain the third ring 12in position within the ï¬rst ring 8, and to bend the periphery of the secondmembrane 2 through two directions. The tolerances of the three rings 8, 10, 12are chosen such that even when the arrangement is in the interengaged positionshown in Figure 1, the two membranes 2 are ï¬rmly held by the interengagedrings.The construction has the considerable advantage that the circularmembranes 2 do not have to be produced to close tolerances. Each circularmembrane 2 can be cut to be generally circular and to have a diameter which issomewhat larger than is required. In its turn, each membrane 2 is positioned asdescribed above and held by the interengagement of the corresponding ring 10,12. Any excess material of the membrane 2 can then be trimmed simply using aknife with the rings 10, 12 acting as guides.To complete the construction of the lens it is necessary to ensure that thethree rings 8, 10, 12 are secured together such that the peripheries of themembranes 2 are ï¬rmly retained to seal the lens and to prevent any leakagefrom the cavity 30 deï¬ned between the two membranes 2. In the embodimentillustrated, the retention of the membranes 2 is achieved by crimping anddeforming the ï¬rst ring 8. In this respect, the upstanding, axially extending, freeend of the limb 18 of the ï¬rst ring 8 is bent over to be received within the recess28 of the third ring 12. Any excess material deformed from the ring 8 during thiscrimping operation is received within an annular space 32 which is deï¬nedbetween the radially outwardly peripheries of the second and third rings 10 and12, and the inner periphery of the limb 18 of the ï¬rst ring 8.Once the lens has been constructed, as shown in Figure 1, and with theouter ring 8 deformed to secure the structure, a duct 34 is drilled through theframe 6 into the cavity 30. The cavity 30 can then be ï¬lled with the transparentï¬uid 4 through the duct 34. With 703 silicone oil as the ï¬uid the resultant lensachieves a focal length range of at least -6 to +10 dioptres, and the range -10 to+10 dioptres should be achievable.Fluid may be introduced into the cavity 30 by way of the duct 34 andretained therein by use, for example, of ducts, plugs and sealing means asCA 02265723 l999-03- 12W0 298/1 1458 PCTIGB97/02427described in International application No. WO 96/38744. In an embodiment, thelens is pre-ï¬lled at this stage with the ï¬uid 4 and an appropriate material isprovided in the duct 34 to seal the cavity 30. However, the material sealing theduct 34 is preferably penetrable by a syringe, for example, so that the pressure5 of the ï¬uid 4 within the cavity 30 can be adjusted.In the embodiment shown, the two axially outer surfaces of the lens areeach protected by a sheet 36 of a polycarbonate. Each polycarbonate sheet 36,for example, may be about â/2 millimetre thick. It will be appreciated that these10 sheets 36 are arranged to extend substantially parallel to each other. Thecircumferential periphery of each of the sheets 36 may be ï¬xed to the annularframe 6 in any appropriate manner. For example, the sheets 36 may beadhered to the frame 6. Additionally and/or alternatively, a plastics materialframe (not shown) of a pair of spectacles, for example, may be arranged to15 receive the annular frame 6 in a manner to retain the sheets 36 against theannular frame 6 in the position of Figure 2.It will be appreciated that alterations and modiï¬cations may be made tothe embodiments described and illustrated herein within the scope of this20 application.
Claims (13)
1. A method of fabricating a variable focus lens, comprising the steps of:
providing a first ring having a cross-section which is generally L-shaped, the upper end of the L forming an axially extending deformable rim;
interengaging second and third rings to engage a first transparent flexible membrane and to retain said first flexible membrane across the second ring;
interengaging said first ring with said second and third rings to engage a second transparent flexible membrane and to retain said second flexible membrane across the second ring, whereby the first and second flexible membranes define a cavity therebetween, the second and third rings being accommodated in the angle of the L;
holding said first, second and third rings together by deforming said rim of the first ring over the third ring, such that said first and second flexible membranes are each tensioned across said second ring;
the first, second and third rings all being formed from a material sufficiently rigid to allow the rings to positively interengage with an adjacent ring; and providing a duct through said rings, which duct is in communication with said cavity and filling a transparent fluid into said cavity through said duct.
providing a first ring having a cross-section which is generally L-shaped, the upper end of the L forming an axially extending deformable rim;
interengaging second and third rings to engage a first transparent flexible membrane and to retain said first flexible membrane across the second ring;
interengaging said first ring with said second and third rings to engage a second transparent flexible membrane and to retain said second flexible membrane across the second ring, whereby the first and second flexible membranes define a cavity therebetween, the second and third rings being accommodated in the angle of the L;
holding said first, second and third rings together by deforming said rim of the first ring over the third ring, such that said first and second flexible membranes are each tensioned across said second ring;
the first, second and third rings all being formed from a material sufficiently rigid to allow the rings to positively interengage with an adjacent ring; and providing a duct through said rings, which duct is in communication with said cavity and filling a transparent fluid into said cavity through said duct.
2. A method as claimed in claim 1, wherein said duct is formed through said rings.
3. A method as claimed in claim 1 or claim 2, wherein said first ring defines the periphery of a peripheral, annular frame for the lens, which annular frame is defined by said first, second and third rings.
4. A variable focus lens having an annular frame defined by first, second and third interengaged rings all being formed from a material sufficiently rigid to allow the rings to positively interengage with an adjacent ring, and a cavity containing, a transparent fluid defined between first and second transparent, flexible membranes tensioned across said second ring, wherein said first ring is generally L-shaped in cross-section and that the second and third rings are accommodated in the angle of the L so that said first ring defines the periphery of said annular frame, and wherein each of said first and second flexible membranes is held together by a rim, at the upper end of the L-shaped first ring, which is deformed over said third ring.
5. A variable focus lens as claimed in claim 4, wherein the annular frame has a closed curve, peripheral shape.
6. A variable focus lens as claimed in claim 4 or claim 5, wherein said first, second and third rings are held together to retain the flexible membranes under tension and to seal said cavity.
7. A variable focus lens as claimed in any one of claims 4 to 6, wherein the interengagements between said rings cause the periphery of an appropriate flexible membrane to change direction more than once.
8. A variable focus lens as claimed in any one of claims 4 to 7, wherein two separate flexible membranes are provided, with the periphery of the first flexible membrane being held by the interengagement of the first and second rings, and the periphery of the second flexible membrane being held by the interengagement of the second and third rings.
9. A variable focus lens as claimed in any one of claims 4 to 8, wherein each of said first and second flexible membranes is of high grade Mylar.
10. A variable focus lens as claimed in any one of claims 4 to 9, wherein the rings are made of one of a high impact resistant plastics material, aluminium, or titanium.
11. A variable focus lens as claimed in any one of claims 4 to 10, wherein the transparent fluid retained within the cavity is a silicone oil.
12. A variable focus lens as claimed in any one of claims 4 to 11, wherein the lens is additionally provided with two spaced, substantially parallel sheets of transparent polycarbonate between which the cavity defined by the flexible membranes is arranged.
13. A pair of spectacles having a pair of lens apertures, and a respective variable focus lens as claimed in any one of claims 4 to 12 supported within each lens aperture.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9619198.6A GB9619198D0 (en) | 1996-06-25 | 1996-09-13 | Improvements in or relating to variable focus lenses |
| GB9619198.6 | 1996-09-13 | ||
| PCT/GB1997/002427 WO1998011458A1 (en) | 1996-09-13 | 1997-09-09 | Improvements in or relating to variable focus lenses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2265723A1 CA2265723A1 (en) | 1998-03-19 |
| CA2265723C true CA2265723C (en) | 2008-03-11 |
Family
ID=10799926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002265723A Expired - Fee Related CA2265723C (en) | 1996-09-13 | 1997-09-09 | Improvements in or relating to variable focus lenses |
Country Status (25)
| Country | Link |
|---|---|
| US (1) | US6188525B1 (en) |
| EP (1) | EP0927370B1 (en) |
| JP (1) | JP4163751B2 (en) |
| KR (1) | KR100517518B1 (en) |
| CN (1) | CN1208633C (en) |
| AP (1) | AP1012A (en) |
| AT (1) | ATE271695T1 (en) |
| AU (1) | AU4129397A (en) |
| BG (1) | BG103324A (en) |
| BR (1) | BR9711792A (en) |
| CA (1) | CA2265723C (en) |
| DE (1) | DE69729944T2 (en) |
| EA (1) | EA002927B1 (en) |
| EE (1) | EE9900091A (en) |
| HU (1) | HUP0000443A3 (en) |
| IL (1) | IL128950A (en) |
| IS (1) | IS4999A (en) |
| NO (1) | NO991237L (en) |
| NZ (1) | NZ335150A (en) |
| OA (1) | OA10994A (en) |
| PL (1) | PL332325A1 (en) |
| SK (1) | SK285638B6 (en) |
| TR (1) | TR199900573T2 (en) |
| TW (1) | TW582550U (en) |
| WO (1) | WO1998011458A1 (en) |
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1997
- 1997-09-09 US US09/254,848 patent/US6188525B1/en not_active Expired - Lifetime
- 1997-09-09 CA CA002265723A patent/CA2265723C/en not_active Expired - Fee Related
- 1997-09-09 BR BR9711792-7A patent/BR9711792A/en not_active IP Right Cessation
- 1997-09-09 AT AT97939072T patent/ATE271695T1/en not_active IP Right Cessation
- 1997-09-09 TR TR1999/00573T patent/TR199900573T2/en unknown
- 1997-09-09 HU HU0000443A patent/HUP0000443A3/en unknown
- 1997-09-09 EP EP97939072A patent/EP0927370B1/en not_active Expired - Lifetime
- 1997-09-09 EE EEP199900091A patent/EE9900091A/en unknown
- 1997-09-09 KR KR10-1999-7002143A patent/KR100517518B1/en not_active IP Right Cessation
- 1997-09-09 EA EA199900289A patent/EA002927B1/en not_active IP Right Cessation
- 1997-09-09 WO PCT/GB1997/002427 patent/WO1998011458A1/en active IP Right Grant
- 1997-09-09 AP APAP/P/1999/001485A patent/AP1012A/en active
- 1997-09-09 DE DE69729944T patent/DE69729944T2/en not_active Expired - Lifetime
- 1997-09-09 PL PL97332325A patent/PL332325A1/en unknown
- 1997-09-09 IL IL128950A patent/IL128950A/en not_active IP Right Cessation
- 1997-09-09 CN CNB971996695A patent/CN1208633C/en not_active Expired - Fee Related
- 1997-09-09 JP JP51335598A patent/JP4163751B2/en not_active Expired - Fee Related
- 1997-09-09 SK SK323-99A patent/SK285638B6/en not_active IP Right Cessation
- 1997-09-09 NZ NZ335150A patent/NZ335150A/en unknown
- 1997-09-09 AU AU41293/97A patent/AU4129397A/en not_active Abandoned
-
1998
- 1998-03-17 TW TW092211613U patent/TW582550U/en not_active IP Right Cessation
-
1999
- 1999-03-12 NO NO991237A patent/NO991237L/en unknown
- 1999-03-12 OA OA9900055A patent/OA10994A/en unknown
- 1999-03-12 IS IS4999A patent/IS4999A/en unknown
- 1999-04-13 BG BG103324A patent/BG103324A/en unknown
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