GB739149A - Improvements in or relating to sighting devices - Google Patents
Improvements in or relating to sighting devicesInfo
- Publication number
- GB739149A GB739149A GB35891/53A GB3589153A GB739149A GB 739149 A GB739149 A GB 739149A GB 35891/53 A GB35891/53 A GB 35891/53A GB 3589153 A GB3589153 A GB 3589153A GB 739149 A GB739149 A GB 739149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- light
- dec
- mark
- viewed
- 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
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/14—Viewfinders
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Telescopes (AREA)
Abstract
739,149. Sighting devices. CONTRAVES AKT.-GES. Dec. 24, 1953 [Dec. 24, 1952; Dec. 21, 1953], No. 35891/53. Class 97 (1). [Also in Group XL (a)] In a sighting device in which the object sighted is viewed by reflection in a plane mirror through which light from a mask is projected to allow the object or the mark to be viewed in superposition, the mirror is formed by an interference layer reflecting light of all wavelengths except those in a region above 600 millimicrons, and transmitting in that region. As shown, the object O is viewed by reflection at a prism 4 and interference layer 5 in superposition with the image m<SP>1</SP> 1 , m<SP>1</SP> 2 of a mark m formed from light pass- . 281 ing through a lens 9. For daylight use the mark is illuminated by daylight but for use at night a source operated by an electric battery may be used. This source ernits light in the red region above 600 mÁ which passes through the interference layer 5 while the latter reflects light from the object which, at night, is stated to be deficient in the said red region so that no visible light from the object is lost due to the mirror 5. An alternative source comprises a layer 16 of zinc sulphide and manganese actuated to fluorescence by an admixture of radioactive material. Alternatively the radioactive material may be formed as a layer 18 on a plate 17, the member 15 bearing the sulphide layer 16 being slidable to bring the latter into contact with the layer 18 when illumination is required and may be withdrawn to avoid exhaustion of the material of the layer 16 when no illumination is required.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH739149X | 1952-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB739149A true GB739149A (en) | 1955-10-26 |
Family
ID=4532987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35891/53A Expired GB739149A (en) | 1952-12-24 | 1953-12-24 | Improvements in or relating to sighting devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB739149A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3000257A (en) * | 1959-06-11 | 1961-09-19 | Domeshek Sol | Ambient illumination of reticle for range finder |
-
1953
- 1953-12-24 GB GB35891/53A patent/GB739149A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3000257A (en) * | 1959-06-11 | 1961-09-19 | Domeshek Sol | Ambient illumination of reticle for range finder |
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