US3372008A - Metal reflector and method of manufacturing such reflectors - Google Patents
Metal reflector and method of manufacturing such reflectors Download PDFInfo
- Publication number
- US3372008A US3372008A US194217A US19421762A US3372008A US 3372008 A US3372008 A US 3372008A US 194217 A US194217 A US 194217A US 19421762 A US19421762 A US 19421762A US 3372008 A US3372008 A US 3372008A
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- United States
- Prior art keywords
- aluminum
- silicon
- alloy
- reflectors
- manganese
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 12
- 239000002184 metal Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 31
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 12
- 229910052749 magnesium Inorganic materials 0.000 claims description 12
- 239000011777 magnesium Substances 0.000 claims description 12
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 235000010210 aluminium Nutrition 0.000 description 24
- 239000004411 aluminium Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 7
- 238000007743 anodising Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- NGPGDYLVALNKEG-UHFFFAOYSA-N azanium;azane;2,3,4-trihydroxy-4-oxobutanoate Chemical compound [NH4+].[NH4+].[O-]C(=O)C(O)C(O)C([O-])=O NGPGDYLVALNKEG-UHFFFAOYSA-N 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
- G02B5/085—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal
- G02B5/0858—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal the reflecting layers comprising a single metallic layer with one or more dielectric layers
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/923—Physical dimension
- Y10S428/924—Composite
- Y10S428/925—Relative dimension specified
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9335—Product by special process
- Y10S428/938—Vapor deposition or gas diffusion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12583—Component contains compound of adjacent metal
- Y10T428/1259—Oxide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/12764—Next to Al-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12993—Surface feature [e.g., rough, mirror]
Definitions
- the invention relates to metal reflectors and to a method of manufacturing such reflectors.
- Metal reflectors for outdoor use and for use in damp spaces have to satisfy stringent requirements. They have to be capable of withstanding any type of climate and elevated temperatures while retaining their reflecting power.
- Materials which might be particularly suitable for such use are aluminium casting alloys consisting mainly of aluminum with magnesium and/or silicon as main alloying element or elements.
- satisfactory corrosion resistance which in some cases can be improved by the provision of an oxide film, for example by anodizing, and sufficient mechanical strength at the temperatures which may occur in practice
- the use of an aluminium casting alloy has the advantage that the reflector, which frequently has a complicated shape, can be simply manufactured by casting in sand or a permanent mold.
- the said alloys and many other alloys suffer from the disadvantage that articles manufactured from them cannot be polished so as to be highly reflecting.
- the coefficient of reflection, expressed as a percentage, of a known aluminium alloy containing 1.0% of magnesium and 5% of silicon after polishing is at most about 60%, whereas the coeflicient of reflection of pure aluminium after polishing may be from 80 to 90%.
- a further disadvantage consists in that an anodizing treatment of an aluminium alloy performed to increase the corrosion resistance reduces the coeificient of reflection by about one half, while some alloys do not form a continuous oxide film during this treatment.
- reflectors comprising a support made of a material which itself cannot be polished so as to become highly reflecting when provided with a reflecting layer consisting of pure or substantially pure aluminium coated with a protective oxide film, are particularly suitable.
- Mirrors and reflecting layers produced by deposition of pure or substantially pure aluminium from vapour are known. It is also known to anodize aluminium so as to grow an oxide film which imparts an increased corrosion resistance to the metal.
- an oxide film having a thickness which does not reduce the reflectivity to an unserviceable value that is to say, a thickness of the order of magnitude of from 5 to microns, is not capable of withstanding temperatures exceeding about 150 C. for a prolonged period of time. Above the said temperature cracks are produced in the oxide film so that the protective action preventing further oxidation is lost and the reflecting power of the mirror is decreased.
- reflectors in accordance with the invention can be heated to temperatures of up to about 300 C. for a prolonged period of time without the oxide film on the aluminium mirror losing its protective action against further oxidation and without the reflectivity deteriorating perceptibly.
- Such a support is preferably made of an aluminium casting alloy containing magnesium and/ or silicon as main alloying element or elements.
- Such alloys are 3,372,008 Patented Mar. 5, 1968 the aluminium alloys containing 3.0% of magnesium, less than 0.6% of manganese and less than 0.3% of silicon, or about 0.4% of managanese and from 12.0 to 13.5% of silicon, or 1.0% of magnesium, from 0.2 to 1.0% of manganese and 5% of silicon, and the like.
- a parabolic reflector was made by casting a molten alloy having the composition 1.0% of magnesium, 0.6% of manganese, 5.0% of silicon and the remainder aluminium, in a suitable mold and cooling in the mold, after which the inner side was polished. The coeflicient of reflection of the material expressed as a percentage was 57%. Part of the reflector was anodized until an oxide film having a thickness of 1 micron was obtained. The coefficient of reflection now was 25%.
- Another part of the reflector was degreased with the aid of an organic solvent, for example trichloroethane, and heated to a temperature of from 250 C. to 275 C., after which this part was treated in a vacuum with the aid of a glow discharge for 10 minutes. After cooling, aluminium was deposited from vapour so as to form a coating having a thickness of about 1.5 micron. This mirror had a coeflicient of reflection of 84%.
- an organic solvent for example trichloroethane
- This climate chamber test had been preceeded by a temperature test at 300 C. for 2 hours and at 250 C. for 24 hours.
- the deterioration of the light reflectivity was only 2% compared with the initial value.
- a metal reflector comprising a cast reflector body of aluminum and having alloys chosen from the group consisting of an alloy having 3.0% of magnesium, less than 0.6% of manganese, less than 3.0% of silicon and the remainder aluminum; an alloy having about 0.4% of manganese, from 12% to 13.5% of silicon and the remainder aluminum; an alloy having about 1.0% of magnesium, from 0.2% to 1.0% of manganese, about 5% of silicon, and the remainder aluminum; a reflecting layer of alumi num on said cast aluminum body and an oxide layer coating on said reflecting layer of aluminum.
- a method of manufacturing a metal reflector comprising casting a metal reflector body from an alloy chosen from the group consisting of an alloy having 3.0% of magnesium, less than 0.6% of manganese, less than 3.0% of silicon and the remainder aluminum; an alloy having about 0.4% of manganese, from 12% to 13.5% of silicon and the remainder aluminum; an alloy having about 1.0% of magnesium, from 0.2% to 1.0% of manganese, about 5% of silicon, and the remainder aluminum, polishing the surface of said body which is desired to be reflecting, degreasing said surface, treating said surface with a glow discharge in a vacuum, vapor depositing aluminum upon said surface, and anodizing said polished aluminum reflective surface whereby said reflective surface is coated With an oxide layer.
Description
United States Patent F METAL REFLECTOR AND METHGD OF MANUFACTURING SUCH REFLECTORS Cornelis Korver, Eindhoven, Netherlands, assignor to North American Philips Company, Inc., New York,
N.Y., a corporation of Delaware No Drawing. Filed May 10, 1962, Ser. No. 194,217 Claims priority, application lgletherlands, May 29, 1961, 2 5, 87 3 Claims. (Cl. 29183.5)
The invention relates to metal reflectors and to a method of manufacturing such reflectors.
Metal reflectors for outdoor use and for use in damp spaces have to satisfy stringent requirements. They have to be capable of withstanding any type of climate and elevated temperatures while retaining their reflecting power. Materials which might be particularly suitable for such use are aluminium casting alloys consisting mainly of aluminum with magnesium and/or silicon as main alloying element or elements. In addition to satisfactory machinability, satisfactory corrosion resistance, which in some cases can be improved by the provision of an oxide film, for example by anodizing, and sufficient mechanical strength at the temperatures which may occur in practice, the use of an aluminium casting alloy has the advantage that the reflector, which frequently has a complicated shape, can be simply manufactured by casting in sand or a permanent mold.
However, the said alloys and many other alloys, such as brass, V A-steel, cast iron, and similar materials suffer from the disadvantage that articles manufactured from them cannot be polished so as to be highly reflecting. For example, the coefficient of reflection, expressed as a percentage, of a known aluminium alloy containing 1.0% of magnesium and 5% of silicon after polishing is at most about 60%, whereas the coeflicient of reflection of pure aluminium after polishing may be from 80 to 90%.
A further disadvantage consists in that an anodizing treatment of an aluminium alloy performed to increase the corrosion resistance reduces the coeificient of reflection by about one half, while some alloys do not form a continuous oxide film during this treatment.
It has now been found that reflectors comprising a support made of a material which itself cannot be polished so as to become highly reflecting when provided with a reflecting layer consisting of pure or substantially pure aluminium coated with a protective oxide film, are particularly suitable.
Mirrors and reflecting layers produced by deposition of pure or substantially pure aluminium from vapour are known. It is also known to anodize aluminium so as to grow an oxide film which imparts an increased corrosion resistance to the metal. However, in practice it has been found that such an oxide film having a thickness which does not reduce the reflectivity to an unserviceable value, that is to say, a thickness of the order of magnitude of from 5 to microns, is not capable of withstanding temperatures exceeding about 150 C. for a prolonged period of time. Above the said temperature cracks are produced in the oxide film so that the protective action preventing further oxidation is lost and the reflecting power of the mirror is decreased.
Surprisingly, it has now been found that reflectors in accordance with the invention can be heated to temperatures of up to about 300 C. for a prolonged period of time without the oxide film on the aluminium mirror losing its protective action against further oxidation and without the reflectivity deteriorating perceptibly.
Such a support is preferably made of an aluminium casting alloy containing magnesium and/ or silicon as main alloying element or elements. Examples of such alloys are 3,372,008 Patented Mar. 5, 1968 the aluminium alloys containing 3.0% of magnesium, less than 0.6% of manganese and less than 0.3% of silicon, or about 0.4% of managanese and from 12.0 to 13.5% of silicon, or 1.0% of magnesium, from 0.2 to 1.0% of manganese and 5% of silicon, and the like.
In order that the invention may readily be carried into effect, an embodiment thereof will now be described in detail in the following example.
A parabolic reflector was made by casting a molten alloy having the composition 1.0% of magnesium, 0.6% of manganese, 5.0% of silicon and the remainder aluminium, in a suitable mold and cooling in the mold, after which the inner side was polished. The coeflicient of reflection of the material expressed as a percentage was 57%. Part of the reflector was anodized until an oxide film having a thickness of 1 micron was obtained. The coefficient of reflection now was 25%.
Another part of the reflector was degreased with the aid of an organic solvent, for example trichloroethane, and heated to a temperature of from 250 C. to 275 C., after which this part was treated in a vacuum with the aid of a glow discharge for 10 minutes. After cooling, aluminium was deposited from vapour so as to form a coating having a thickness of about 1.5 micron. This mirror had a coeflicient of reflection of 84%. After anodizing in a solution of ammonium tartrate (pH 5.5) with a voltage of 110 volts (aluminium electrode) until an oxide film having a thickness of 1 micron was obtained, the coefficient of reflection still was In many cases an oxide layer having a thickness of 0.1 micron proves sufficient, as the following corrosion resistance tests show.
An anodized reflector surface provided with an oxide film of thickness 0.1 micron after an endurance test of 4 weeks in a climate chamber, in which the relative humidity was from to and the temperature was 42 C., did not exhibit measurable losses of light-reflecting properties. This climate chamber test had been preceeded by a temperature test at 300 C. for 2 hours and at 250 C. for 24 hours.
In case of pitting, that is to say, the occurrence of local points of attack owing to the porosity of the test casting, the rate of extension and expansion of the centers of attack was not increased. This was proved by immersing a test article in a solution containing 25 gms. of common salt, 15 mls. of glacial acetic acid, 7 mls. of 30% hydrogen peroxide and 1 gr. of crystallized copper sulphate per liter of distilled water, for 8 hours.
The deterioration of the light reflectivity was only 2% compared with the initial value.
Comparable results were obtained with reflectors the supports of which were made from other metals, for example brass.
What is claimed is:
1. A metal reflector comprising a cast reflector body of aluminum and having alloys chosen from the group consisting of an alloy having 3.0% of magnesium, less than 0.6% of manganese, less than 3.0% of silicon and the remainder aluminum; an alloy having about 0.4% of manganese, from 12% to 13.5% of silicon and the remainder aluminum; an alloy having about 1.0% of magnesium, from 0.2% to 1.0% of manganese, about 5% of silicon, and the remainder aluminum; a reflecting layer of alumi num on said cast aluminum body and an oxide layer coating on said reflecting layer of aluminum.
2. A metal reflector as claimed in claim 1 wherein the thickness of said oxide layer is approximately 0.1 micron.
3. A method of manufacturing a metal reflector comprising casting a metal reflector body from an alloy chosen from the group consisting of an alloy having 3.0% of magnesium, less than 0.6% of manganese, less than 3.0% of silicon and the remainder aluminum; an alloy having about 0.4% of manganese, from 12% to 13.5% of silicon and the remainder aluminum; an alloy having about 1.0% of magnesium, from 0.2% to 1.0% of manganese, about 5% of silicon, and the remainder aluminum, polishing the surface of said body which is desired to be reflecting, degreasing said surface, treating said surface with a glow discharge in a vacuum, vapor depositing aluminum upon said surface, and anodizing said polished aluminum reflective surface whereby said reflective surface is coated With an oxide layer.
References Cited UNITED STATES PATENTS 2,017,757 10/1935 Keller et al. 2,040,617 5/1936 Mason et al. 2,084,327 6/1937 Edwards 88-105 2 2,108,604 2/1938 Mason 88-105 2,443,196 6/1948 Raines et a1. 2,513,149 6/1950 Coutant et al 88-105 X FOREIGN PATENTS 337,558 11/1930 Great Britain. 1,03 6,081 4/1953 France.
OTHER REFERENCES Hass et al., On the Structure and Properties of Some Metal and Metal Oxide Films, article in Journal de Physique et le Radium, v01. 11, No. 7, July 1950, pp. 394402 cited.
15 HYLAND BIZOT, Primary Examiner.
DAVID L. RECK, RICHARD O. DEAN, DAVID H.
RUBIN, Examiners.
Claims (1)
1. A METAL REFLECTOR COMPRISING A CAST REFLECTOR BODY OF ALUMINUM AND HAVING ALLOYS CHOSEN FROM THE GROUP CONSISTING OF AN ALLOY HAVING 3.0% OF MAGNESIUM LESS THAN 0.6% OF MANGANESE, LESS THAN 3.0% OF SILICON AND THE REMAINDER ALUMINUM; AND ALLOY HAVING ABOUT 0.4% OF MANGANESE, FROM 12% TO 13.5% OF SILICON AND THE REMAINDER ALUMINUM; AN ALLOY HAVING ABOUT 1.0% OF MAGNESIUM, FROM 0.2% TO 1.0% OF MANGANESE, ABOUT 5% OF SILICON, AND THE REMAINDER ALUMINUM; A REFLECTING LAYER OF ALUMINUM ON SAID CAST ALUMINUM BODY AND AN OXIDE LAYER COATING ON SAID REFLECTING LAYER OF ALUMINUM.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL265287 | 1961-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3372008A true US3372008A (en) | 1968-03-05 |
Family
ID=19753064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US194217A Expired - Lifetime US3372008A (en) | 1961-05-29 | 1962-05-10 | Metal reflector and method of manufacturing such reflectors |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3372008A (en) |
| CH (1) | CH439182A (en) |
| DK (1) | DK103862C (en) |
| GB (1) | GB1011977A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403657A (en) * | 1991-01-11 | 1995-04-04 | Alusuisse-Lonza Services Ltd. | Aluminum surfaces |
| US5779871A (en) * | 1994-11-24 | 1998-07-14 | Alusuisse Technology & Management Ltd. | Process of manufacturing aluminum surfaces for technical lighting purposes |
| CN102277520A (en) * | 2010-06-08 | 2011-12-14 | 西安康博新材料科技有限公司 | Aluminium-based material reflector and preparation method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8302165D0 (en) * | 1983-01-26 | 1983-03-02 | Spafax Holdings Plc | Producing optical component |
| US5009761A (en) * | 1984-09-24 | 1991-04-23 | Spafax Holdings Plc., | Method of producing an optical component, and components formed thereby |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB337558A (en) * | 1929-10-09 | 1930-11-06 | Birmingham Aluminium Casting | A new or improved light metal alloy |
| US2017757A (en) * | 1933-10-20 | 1935-10-15 | Aluminum Co Of America | Duplex metal article |
| US2040617A (en) * | 1934-02-10 | 1936-05-12 | Aluminum Co Of America | Method of producing bright surfaces on aluminum |
| US2084327A (en) * | 1933-10-11 | 1937-06-22 | Aluminum Co Of America | Composite reflector |
| US2108604A (en) * | 1933-08-02 | 1938-02-15 | Aluminum Co Of America | Aluminum reflector |
| US2443196A (en) * | 1944-06-16 | 1948-06-15 | Raines Arnold | Process for making front-surface mirrors |
| US2513149A (en) * | 1946-05-27 | 1950-06-27 | Coutant Andre Clement | Rotary reflecting element in a view finder for cinematographic cameras |
| FR1036081A (en) * | 1950-04-26 | 1953-09-03 | Aluminum reflectors manufacturing process |
-
1962
- 1962-05-10 US US194217A patent/US3372008A/en not_active Expired - Lifetime
- 1962-05-25 GB GB20212/62A patent/GB1011977A/en not_active Expired
- 1962-05-25 DK DK236562AA patent/DK103862C/en active
- 1962-05-28 CH CH647662A patent/CH439182A/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB337558A (en) * | 1929-10-09 | 1930-11-06 | Birmingham Aluminium Casting | A new or improved light metal alloy |
| US2108604A (en) * | 1933-08-02 | 1938-02-15 | Aluminum Co Of America | Aluminum reflector |
| US2084327A (en) * | 1933-10-11 | 1937-06-22 | Aluminum Co Of America | Composite reflector |
| US2017757A (en) * | 1933-10-20 | 1935-10-15 | Aluminum Co Of America | Duplex metal article |
| US2040617A (en) * | 1934-02-10 | 1936-05-12 | Aluminum Co Of America | Method of producing bright surfaces on aluminum |
| US2443196A (en) * | 1944-06-16 | 1948-06-15 | Raines Arnold | Process for making front-surface mirrors |
| US2513149A (en) * | 1946-05-27 | 1950-06-27 | Coutant Andre Clement | Rotary reflecting element in a view finder for cinematographic cameras |
| FR1036081A (en) * | 1950-04-26 | 1953-09-03 | Aluminum reflectors manufacturing process |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403657A (en) * | 1991-01-11 | 1995-04-04 | Alusuisse-Lonza Services Ltd. | Aluminum surfaces |
| US5527572A (en) * | 1991-01-11 | 1996-06-18 | Alusuisse-Lonza Services Ltd. | Aluminum surfaces |
| US5663001A (en) * | 1991-01-11 | 1997-09-02 | Alusuisse Technology & Management Ltd. | Aluminum surfaces |
| US5779871A (en) * | 1994-11-24 | 1998-07-14 | Alusuisse Technology & Management Ltd. | Process of manufacturing aluminum surfaces for technical lighting purposes |
| CN102277520A (en) * | 2010-06-08 | 2011-12-14 | 西安康博新材料科技有限公司 | Aluminium-based material reflector and preparation method thereof |
| CN102277520B (en) * | 2010-06-08 | 2012-12-19 | 西安康博新材料科技有限公司 | Aluminium-based material reflector and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DK103862C (en) | 1966-02-28 |
| CH439182A (en) | 1967-07-15 |
| GB1011977A (en) | 1965-12-01 |
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