GB440996A - Improvements in magnifying glasses - Google Patents
Improvements in magnifying glassesInfo
- Publication number
- GB440996A GB440996A GB18261/35A GB1826135A GB440996A GB 440996 A GB440996 A GB 440996A GB 18261/35 A GB18261/35 A GB 18261/35A GB 1826135 A GB1826135 A GB 1826135A GB 440996 A GB440996 A GB 440996A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- support
- magnifying
- curved
- cemented
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/002—Magnifying glasses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
440,996. Magnifying-lenses. BUSCH AKT.-GES. OPTISCHE INDUSTRIE, E., 5, Berliner Strasse, Rathenow, Germany. June 26, 1935, Nos. 18261 and 18262. Convention dates, July 4, 1934 and Nov. 30, 1934. [Class 97 (i)] A magnifying appliance consists of a lens L mounted in the upper end of a support S which rests on the.object to be observed, the upper surface of the lens being more strongly curved than the lower surface and the axial distance of the lower surface from the object being less than the diameter of the lens. Preferably the upper surface is spherical and the lower surface is plane, the axial distance of the upper surface from the object being from 0À8 to 1À1 times its radius of curvature. To enable the magnification to be increased without distortion the upper surface may be aspherically curved, the radius of curvature at the vertex being less than that at the margin. Also the lower surface may be spherically curved so that the lens is of meniscus form. In Fig. 3, the lens is secured in a recess in the upper end of the support which is made of glass &c. In Fig. 5 the lens is cemented within a support of substantially hemispherical shape. In another form the lower surface of the lens is cemented or fused to the top of a ring-shaped support.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE440996X | 1934-07-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB440996A true GB440996A (en) | 1936-01-09 |
Family
ID=6513578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18261/35A Expired GB440996A (en) | 1934-07-04 | 1935-06-26 | Improvements in magnifying glasses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB440996A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949978A (en) * | 1988-11-25 | 1990-08-21 | David Berner | Magnifying device |
-
1935
- 1935-06-26 GB GB18261/35A patent/GB440996A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949978A (en) * | 1988-11-25 | 1990-08-21 | David Berner | Magnifying device |
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