GB2392130A - Mould creation for high surface quality curved optical components - Google Patents
Mould creation for high surface quality curved optical components Download PDFInfo
- Publication number
- GB2392130A GB2392130A GB0219609A GB0219609A GB2392130A GB 2392130 A GB2392130 A GB 2392130A GB 0219609 A GB0219609 A GB 0219609A GB 0219609 A GB0219609 A GB 0219609A GB 2392130 A GB2392130 A GB 2392130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- optical components
- curved optical
- creation
- high surface
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00596—Mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
- B29C33/3857—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Method for the production, through deposition of material onto a pre-existing curved optical surface with the desired properties for reproduction, of a highly accurate mould for use in the mass production of optical components. The reproduction of the optical components may be by injection moulding or another process.
Description
1 23921 30
Mould creation for high surface quality curved optical components The quality of surface finish on optical components is important, especially on reflecting surfaces. The smoother the surface finish the better the optical qualities of a component.
A surface finish with a value of 1/8th of a wavelength of visible light (the normal value taken for wavelength is green light at about 500-SSOnm) from peak to valley of surface imperfections as a root mean square (RMS) value over the whole of the surface is normally considered good for uses such as astronomy where the optical quality of components is critical.
To date, highly accurate curved optical surfaces with finishes of 1/8th of a wavelength RMS, have generally been produced by grinding and polishing. This method is labour intensive and time consuming, despite the introduction of automation.
While plastics have been used to create curved optical components for some time.
However moulds for the production of plastic optical components are made with a diamond tipped cutting tool, leading to a surface accuracy of about 500nm, which is insufficient for precision use.
The current situation therefore leads to a market with either high quality optical components which are expensive due to the intensive production process, or cheap optical components with poor surface finishes.
The present invention details the production of a highly accurate mould, through the deposition of material onto an existing surface that has the desired optical properties and surface finish? for use in the production of curved optical components.
For example, to mass produce a concave mirror surface with a high quality surface finish of 1 /8th wavelength RMS or better, a blank with the desired shape and surface finish properties may be coated with metal to produce a mould. The metallic coating of the surface may be through sputtering or evaporation with electroforming to develop the thickness of the metallic layer. This mould may then be used to produce plastic components, which have a shape and surface accuracy that closely resembles that of the original blank used to produce the mould. The production of the plastic component may be through injection moulding or another process.
This process may be used to replicate both concave and convex surfaces for use as lens' and mirrors.
Claims (2)
- -2 ClaimsI. A high surface accuracy mould, created through the deposition of material onto an existing curved optical surface with the desired optical shape and surface finish characteristics.
- 2. Items created through the use of a mould as detailed in claim I, by means of injection moulding or another process.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0219609A GB2392130A (en) | 2002-08-22 | 2002-08-22 | Mould creation for high surface quality curved optical components |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0219609A GB2392130A (en) | 2002-08-22 | 2002-08-22 | Mould creation for high surface quality curved optical components |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0219609D0 GB0219609D0 (en) | 2002-10-02 |
GB2392130A true GB2392130A (en) | 2004-02-25 |
Family
ID=9942808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0219609A Withdrawn GB2392130A (en) | 2002-08-22 | 2002-08-22 | Mould creation for high surface quality curved optical components |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2392130A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4434113A (en) * | 1982-07-13 | 1984-02-28 | Neefe Charles W | Spin casting lenses having reduced spherical aberration |
JPH03230923A (en) * | 1990-02-05 | 1991-10-14 | Toshiba Corp | Mold and manufacture therefor |
JPH04131211A (en) * | 1990-09-21 | 1992-05-01 | Toshiba Mach Co Ltd | Plastic lens manufacture and manufacturing mold |
JPH0985749A (en) * | 1995-09-28 | 1997-03-31 | Washi Kosan Kk | Mold for lens of glasses |
EP0878291A1 (en) * | 1997-05-14 | 1998-11-18 | Eastman Kodak Company | Method for fabricating tools for molding diffractive surfaces on optical lenses |
-
2002
- 2002-08-22 GB GB0219609A patent/GB2392130A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4434113A (en) * | 1982-07-13 | 1984-02-28 | Neefe Charles W | Spin casting lenses having reduced spherical aberration |
JPH03230923A (en) * | 1990-02-05 | 1991-10-14 | Toshiba Corp | Mold and manufacture therefor |
JPH04131211A (en) * | 1990-09-21 | 1992-05-01 | Toshiba Mach Co Ltd | Plastic lens manufacture and manufacturing mold |
JPH0985749A (en) * | 1995-09-28 | 1997-03-31 | Washi Kosan Kk | Mold for lens of glasses |
EP0878291A1 (en) * | 1997-05-14 | 1998-11-18 | Eastman Kodak Company | Method for fabricating tools for molding diffractive surfaces on optical lenses |
Also Published As
Publication number | Publication date |
---|---|
GB0219609D0 (en) | 2002-10-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |