WO2000014594A1 - Lentille filtre protectrice - Google Patents

Lentille filtre protectrice Download PDF

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Publication number
WO2000014594A1
WO2000014594A1 PCT/US1999/018084 US9918084W WO0014594A1 WO 2000014594 A1 WO2000014594 A1 WO 2000014594A1 US 9918084 W US9918084 W US 9918084W WO 0014594 A1 WO0014594 A1 WO 0014594A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
glass
accordance
filter
filter lens
Prior art date
Application number
PCT/US1999/018084
Other languages
English (en)
Inventor
Thomas G. Havens
David J. Kerko
Brent M. Wedding
Original Assignee
Corning Incorporated
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
Application filed by Corning Incorporated filed Critical Corning Incorporated
Priority to CA002343364A priority Critical patent/CA2343364A1/fr
Priority to JP2000569280A priority patent/JP2002524771A/ja
Priority to EP99941008A priority patent/EP1119794A4/fr
Publication of WO2000014594A1 publication Critical patent/WO2000014594A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
    • C03C23/007—Other surface treatment of glass not in the form of fibres or filaments by thermal treatment
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/04—Compositions for glass with special properties for photosensitive glass
    • C03C4/06—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/102—Photochromic filters

Definitions

  • a photochromic filter lens having a reduced surface layer to control spectral transmission and method of making is provided.
  • the patent discloses glasses which are particularly suitable for use in the inventive method. Such glasses consist essentially, expressed in weight percent on the oxide bases, of about 0-2.5% Li 2 0, 0-9% Na 2 0, 0-17% K 2 0, 0-
  • Those glasses may also optionally contain up to about 10% total of other ingredients selected from the group in the indicated proportions of 0-6% ZrO 2 , 0-3% Ti0 2 , 0-0.5% PbO, 0-7% BaO, 0-4% CaO, 0-3% MgO, 0-6% Nb 2 0 5 , 0- 4% La 2 0 3 and 0-2% F.
  • those compositions are compatible with the conventional glass colorants selected from the transition metal oxides and rare earth metal oxides. Hence, up to about 1 % total of transition metal oxide colorants and/or up to 5% total of rare earth metal oxide colorants may be included to modify the color of the bulk glass.
  • a major problem with the "blocker" lens is that total absorption of part of the spectrum greatly distorts color perception. This may also occur in the surface colored, glass lens with an unduly long treating time. However, the time of the reducing treatment may be adjusted so that a carefully controlled, small amount of blue transmission, referred to as a "blue leak,” occurs. This provides a less severe distortion of color perception.
  • One object of the present invention is to obviate the need for the front surfacing procedure.
  • Another object is to provide a protective filter lens that closely approximates transmission of a natural color scene, that is, allows a viewer to see the actual, undistorted colors in a scene.
  • a further object is to provide these features either in a lens that is untinted, or in one that has a fixed tint imparted to the glass.
  • Another object is to enable processing of photochromic, progressive lenses.
  • the invention resides, in part, in an ophthalmic, protective, filter lens having a ratio of Z/Y tristimulus values between 0.25-0.40, a dominant wavelength between 570-580 nm. on a color mixture diagram, a sharp transmission drop between 450-500 nm., and transmission not over 30% between 400-450 nm.
  • the invention further resides in a method of producing an ophthalmic, protective filter lens which comprises firing a silver halide-containing, photochromic glass lens in a hydrogen-containing atmosphere within a temperature range of 465° C to 495° C for a time less than 20 minutes, but sufficiently long enough to provide Z Y tristimulus values in the lens such that the ratio of Z/Y is between 0.25-0.40.
  • FIGURE 1 is a graphical representation of transmittance data comparing a conventional, commercial lens with a lens in accordance with the present invention.
  • FIGURE 2 is a graphical representation in which the Z/Y ratio for several different lenses and llluminants are plotted against spectral purity.
  • FIGURE 3 is a graphical representation in which the relative luminous efficiencies for the three types of cone photoreceptors are plotted against wavelengths of visible light.
  • CPF 450 is designed to provide spectral transmission cutoff between 500-450 nm. This lens has proven technically effective for its purpose.
  • the present invention is based on studies directed at improving the natural color perception of this lens, as well as simplifying its production.
  • the values may be compared to either llluminant C, a value defined in terms of light from a northern sky, or llluminant A, a value determined by the spectral distribution from a tungsten lamp. The latter is commonly considered to be a white light.
  • the CPF 450 filter lens is produced by firing a selected, photochromic glass lens in a hydrogen atmosphere for two hours at about 476° C.
  • the selected glass is designated as Code 8122. It has a composition, as calculated in weight percent on an oxide basis, as follows:
  • the Er 2 0 3 and Pd contents are included to impart a fixed brown tint to the lens. These colorants may be omitted if a clear, untinted glass is desired. While the invention was developed using this glass, it is not so limited. For example, other available photochromic glasses may be so treated.
  • the colorant combination of CoO and NiO is included to provide a neutral gray tint to the lens. Again, this combination may be omitted if an untinted glass is desired.
  • Other known colorants may be included to provide other fixed tints to a lens.
  • Protective, filter lenses are commonly produced by firing a suitable photochromic glass lens in a flowing hydrogen atmosphere to provide a thin reduced layer over the entire lens. While other reducing atmospheres may be employed, pure hydrogen has been found most effective.
  • the reduced layer on the front surface of the lens is removed to permit access of activating radiation to impart photochromic behavior. This is accomplished, for example, by grinding and polishing the front surface of the lens. It is a feature of the present invention that the need for this operation is obviated. Fortuitously, sufficient photochromic activating radiation is transmitted through the reduced front surface of the present lens to avoid the need for front surfacing.
  • the present lens and process eliminate a time consuming and expensive, grinding and polishing operation. This not only provides a significant cost savings, but broadens a product line to include progressive-type lenses.
  • FIGURE 1 is a graphical representation in which wavelengths across the visible spectrum are plotted in nm. on the horizontal axis, while transmittance in percent is plotted on the vertical axis.
  • Curve A is the transmission curve for a current CPF 450 lens.
  • Curve B is a transmission curve for a present lens, identified in TABLE I, infra, as lens 3.
  • the lens prepared in accordance with the present invention lens 3 has markedly higher transmittance values in the 400-460 nm wavelength range than does the current lens. This greater transmission in the blue end of the spectrum is a key virtue of the present invention.
  • Transmittances of the present lens are generally greater than 10%, but not over about 30%, at any given wavelength in the 400-460 nm range.
  • the transmittance values for the current CPF 450 lens are generally below 10%) in this range.
  • Polished, piano lenses having a nominal thickness of 2 mm. were prepared from both the Code 8122 and the Code 8135 photochromic glasses. These lenses were fired in a flowing atmosphere of hydrogen gas in a tube furnace for varying times and temperatures. TABLE I, below, sets forth the glass, and the time and temperature of the firing cycle, for each lens tested. Firing time is given in minutes (min.), and temperature is given in °C.
  • FIGURE 2 is a plot of the Z/Y ratio vs. spectral purity for several filter lenses calculated using llluminant C. Also indicated is the Z/Y ratio for llluminant A (III. A) vs. the spectral purity found using the llluminant C white point.
  • the Z Y ratio for llluminant C (III. C) is about 1.2, well outside the scope of FIGURE 2, and not shown.
  • the present, inventive, filter lenses have Z/Y ratios similar to that of llluminant A, which is known to provide excellent color rendition. We believe that the excellent, color rendition performance of these lenses is a consequence of this close relationship.
  • FIGURE 3 is a graphical representation in which relative luminous efficiency is plotted on the vertical axis and wavelengths of the visible spectrum are plotted in nanometers on the horizontal axis. The relative luminous efficiencies for each type of cone photoreceptor are plotted against wavelengths.
  • the resulting efficiency curve for each cone type is designated by S, M, or L.
  • a curve designated L+M gives the weighted efficiency sums for the L and M cones. (The ordinate scale was chosen to have the S and L+M curves peak at unity.) The weighted sum is used because the L and M cones are not present in equal numbers.
  • the y-bar and x-bar functions of the Standard Observer are used in calculating the Y and Z tristimulus values.
  • the weighted sum represents the luminous efficiency function for photopic vision, and that the z-bar and S luminous efficiency functions are the same.
  • the ratio Z/Y relates the short wavelength-sensitive, cone stimulus to the photopic stimulus.
  • a filter lens having filtering properties approximating those of the CPF 450 lens, but having surface coloration on both polished surfaces. This avoids a need to "front surface” a lens.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Thermal Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)
  • Eyeglasses (AREA)

Abstract

La présente invention concerne une lentille filtre protectrice à usage ophtalmique et un procédé de production d'une telle lentille. Cette lentille présente des valeurs de composantes trichromatiques Z et Y entre 0,25-0,40, une longueur d'onde dominante entre 570-580 nm sur un diagramme de mélange de couleurs, une baisse de transmission nette entre 450-500 nm, et une transmission ne dépassant pas 30 % entre 400-450 nm.
PCT/US1999/018084 1998-09-09 1999-08-10 Lentille filtre protectrice WO2000014594A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002343364A CA2343364A1 (fr) 1998-09-09 1999-08-10 Lentille filtre protectrice
JP2000569280A JP2002524771A (ja) 1998-09-09 1999-08-10 保護フィルタレンズ
EP99941008A EP1119794A4 (fr) 1998-09-09 1999-08-10 Lentille filtre protectrice

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9953498P 1998-09-09 1998-09-09
US60/099,534 1998-09-09

Publications (1)

Publication Number Publication Date
WO2000014594A1 true WO2000014594A1 (fr) 2000-03-16

Family

ID=22275471

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/018084 WO2000014594A1 (fr) 1998-09-09 1999-08-10 Lentille filtre protectrice

Country Status (4)

Country Link
EP (1) EP1119794A4 (fr)
JP (1) JP2002524771A (fr)
CA (1) CA2343364A1 (fr)
WO (1) WO2000014594A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4705356A (en) * 1984-07-13 1987-11-10 Optical Coating Laboratory, Inc. Thin film optical variable article having substantial color shift with angle and method
US4968454A (en) * 1988-01-25 1990-11-06 Ppg Industries, Inc. Variable-light transmittance article and method for preparing same
US5381193A (en) * 1993-02-22 1995-01-10 Corning Incorporated Protective filter lenses

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892582A (en) * 1974-02-01 1975-07-01 Robert A Simms Process for changing the tint of a photochromic material and material formed thereby
US4190451A (en) * 1978-03-17 1980-02-26 Corning Glass Works Photochromic glass
DE3042553C2 (de) * 1979-11-19 1995-01-05 Corning Glass Works Silberhalogenid enthaltender photochromer Glaskörper
US4979976A (en) * 1990-04-16 1990-12-25 Corning Incorporated Making colored photochromic glasses
US5491117A (en) * 1995-01-23 1996-02-13 Corning Incorporated Optical filter glasses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4705356A (en) * 1984-07-13 1987-11-10 Optical Coating Laboratory, Inc. Thin film optical variable article having substantial color shift with angle and method
US4968454A (en) * 1988-01-25 1990-11-06 Ppg Industries, Inc. Variable-light transmittance article and method for preparing same
US5381193A (en) * 1993-02-22 1995-01-10 Corning Incorporated Protective filter lenses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1119794A4 *

Also Published As

Publication number Publication date
JP2002524771A (ja) 2002-08-06
CA2343364A1 (fr) 2000-03-16
EP1119794A4 (fr) 2006-02-22
EP1119794A1 (fr) 2001-08-01

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