GB434982A - Improvements in magnifying glasses - Google Patents
Improvements in magnifying glassesInfo
- Publication number
- GB434982A GB434982A GB16659/34A GB1665934A GB434982A GB 434982 A GB434982 A GB 434982A GB 16659/34 A GB16659/34 A GB 16659/34A GB 1665934 A GB1665934 A GB 1665934A GB 434982 A GB434982 A GB 434982A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- magnifying
- june
- examined
- radius
- 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
- 239000011521 glass Substances 0.000 title abstract 2
- 238000006748 scratching Methods 0.000 abstract 1
- 230000002393 scratching effect Effects 0.000 abstract 1
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)
- Glass Compositions (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
434,982. Magnifying - lenses. SENDLINGER OPTISCHE GLASWERKE GES., Goerz-Allee, Zehlendorf, Berlin. June 5, 1934, No. 16659. Convention date, June 7, 1933. Drawings to Specification. [Class 97 (i)] A magnifying-lens to be placed on the body to be examined has its refracting surface facing the observer in the form of a spherical segment less than a hemisphere and subtending an angle of approximately 140‹ at the centre of the sphere, the body to be examined being in the plane in which the intensity of the rays refracted by the spherical surface is a maximum. For glass of which the refractive index is 1À52, the medial thickness of the lens is greater than the radius of curvature of the spherical surface and not more than 1À5 times this radius. The base of the lens may be slightly concave to prevent scratching and may be provided with a scale.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE434982X | 1933-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB434982A true GB434982A (en) | 1935-09-12 |
Family
ID=6506712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16659/34A Expired GB434982A (en) | 1933-06-07 | 1934-06-05 | Improvements in magnifying glasses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB434982A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116540A (en) * | 2015-10-09 | 2015-12-02 | 宫安迪 | Optical magnifier unlikely to cause eye fatigue |
-
1934
- 1934-06-05 GB GB16659/34A patent/GB434982A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116540A (en) * | 2015-10-09 | 2015-12-02 | 宫安迪 | Optical magnifier unlikely to cause eye fatigue |
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