Fire-polished pressed optical lenses and technical glass products in small series – traditionally manufactured since 1877.
Stumpfe GmbH
WeidenbergNew on Amplifa
Company
Stumpfe GmbH, based in Weidenberg, is a specialist in fire-polished pressed spherical and aspherical optical lenses as well as small-format technical glass products. The product range includes biconvex, convex-concave, plano-convex and plano-concave lenses with diameters of 3 to 65 mm made of B270 or customer-supplied glass, plus cylindrical lenses, prisms, cones, and cover discs, step discs and filter glasses to customer specification. Production is carried out using mature craftsmanship on machines partly developed in-house; planning, tool design and construction of pressing tools including sampling are performed in-house. Radii are fire-polished pressed or, on request, ground and polished; centering of lenses, including with protective chamfer, as well as coatings on request complete the services. The focus is on small series with short-lead-time delivery to customers worldwide, including from the optics and technical glass industries.
- Site
- Weidenberg
- Processes
- Fire-polished pressing of spherical lenses (biconvex, convex-concave), Fire-polished pressing of aspherical lenses, Grinding and polishing of radii/flat surfaces (plano-convex/plano-concave lenses), Centering of lenses (also with protective chamfer), Manufacture of cylindrical lenses, Manufacture of prisms, Manufacture of cones, Manufacture of pressings (optical lenses as pressings)
- Materials
- B270 (optical glass), Technical glass, Filter glass, Customer-supplied glass, Fire-polished pressing, Grinding and polishing
- Certificates
- QM system modeled on DIN ISO 9001 (internal, not certified)
- Founded
- 1877
- Industries
- Optics, Technical glass
- 01
Tool development and construction (pressing tool)
- 02
Fire-polished pressing of radii
- 03
Grinding and polishing
- 04
Centering (optionally with protective chamfer)
- 05
Coating on request
- 06
Quality inspection
- 07
Shipping
Materials & Processes
B270 (optical glass)
Standard material for fire-polished pressed optical lenses and pressings.
Customer-supplied glass
Production to customer requirements using glass specified by the customer.
Technical glass
Base material for cover discs, step discs and small glass components.
Filter glass
Filter glasses in various colors and sizes to customer requirements.
Fire-polished pressing
Process for producing spherical and aspherical lens radii.
Grinding and polishing
Post-processing of radii and flat surfaces to optical quality.
Locations
Weidenberg
DEHead office and production
- Part weight / size
- Lenses from 3 mm to 65 mm diameter
- Lot size
- Small series, available at short notice
- Materials
- B270, customer-supplied glass, technical glass, filter glass
- Pressing machines (partly developed in-house)
- Grinding and polishing systems
- Centering machines
Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Fire-polished pressing of spherical lenses (biconvex, convex-concave)Casting | – | 65 mm diameter | – | Small series | B270, Customer-supplied glass |
| Fire-polished pressing of aspherical lensesCasting | – | – | – | – | B270, Customer-supplied glass |
| Grinding and polishing of radii/flat surfaces (plano-convex/plano-concave lenses)Surface | – | – | – | – | Optical glass, Technical glass |
| Centering of lenses (also with protective chamfer)Machining | – | – | – | – | Optical glass |
| Manufacture of cylindrical lensesCasting | – | – | – | – | Optical glass |
| Manufacture of prismsCasting | – | – | – | – | Optical glass |
| Manufacture of conesCasting | – | – | – | – | Optical glass |
| Manufacture of pressings (optical lenses as pressings)Casting | – | 65 mm diameter | – | – | B270 |
| Manufacture of technical glass: cover discs, step discs, filter glassesCasting | – | – | – | Small series | Technical glass, Filter glass |
| Development, design, manufacture and sampling of pressing toolsEngineering | – | – | – | – | – |
1 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| In-house developed machines (pressing technology, details not specified) | partly developed in-house | – | – | – | Weidenberg |
Additional services
Quality
An internal quality management system modeled on DIN ISO 9001 ensures continuous quality of the optical lenses and technical glass; lenses are measured and inspected.
| Evidence | Weidenberg |
|---|---|
| QM system modeled on DIN ISO 9001 (internal, not certified) |
History
- Ende 19.
The Stumpfe family began glass processing in Gablonz, Bohemia; production of chandelier drops, knife blocks and other items.
- 1877
Company founding
- 1950er
Relocation of the family to Weidenberg; rebuilding of the company, company headquarters to this day
- Anfang 1970e
Expansion of the product range and increasing specialization in lens manufacturing
- Heute
Company managed in the 4th generation by Martina Seebe