GB842456A - Improvements in or relating to viewing devices for optical instruments - Google Patents
Improvements in or relating to viewing devices for optical instrumentsInfo
- Publication number
- GB842456A GB842456A GB3874856A GB3874856A GB842456A GB 842456 A GB842456 A GB 842456A GB 3874856 A GB3874856 A GB 3874856A GB 3874856 A GB3874856 A GB 3874856A GB 842456 A GB842456 A GB 842456A
- Authority
- GB
- United Kingdom
- Prior art keywords
- illuminated
- image
- eye
- tube
- viewing
- 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)
- Microscoopes, Condenser (AREA)
Abstract
842,456. Eyepieces. DEUTSCHER DEMOKRATISCHER RUNDFUNK BETRIEBSLABORATORIUM FUR RUNDFUNK UND FERNSEHEN. Dec. 19, 1956, No. 38748/56. Class 97(1) A viewing device for optical instruments such as microscopes, telescopes or viewfinders comprises an eyepiece and a housing or viewing tube the inner surface of which is adapted to be illuminated by incident light from inside the tube or by transmitted light from outside so that the illuminated surfaces appear to the eye with a brightness equal to the mean brightness of the image produced by the instrument, the said image being surrounded by an illuminated field corresponding in size to the visual angle of the human eye. As shown the image to be viewed is projected by a lens I on to a field lens 2 and is viewed through an eyepiece 3. The viewing tube 5 is of spherical form and is made of semitransparent glass or plastic. It may, however, be opaque. Lamps 7 illuminate the inner surface of the sphere so that the eye 4 sees the image on the lens 2 surrounded by an equally illuminated area. The non-viewing eye may be provided with a similarly illuminated chamber. The lamps 7 may be omitted, the tube 5 being translucent and illuminated externally. The illuminations may be controlled photo-electrically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3874856A GB842456A (en) | 1956-12-19 | 1956-12-19 | Improvements in or relating to viewing devices for optical instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3874856A GB842456A (en) | 1956-12-19 | 1956-12-19 | Improvements in or relating to viewing devices for optical instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB842456A true GB842456A (en) | 1960-07-27 |
Family
ID=10405454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3874856A Expired GB842456A (en) | 1956-12-19 | 1956-12-19 | Improvements in or relating to viewing devices for optical instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB842456A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729648A (en) * | 1986-11-10 | 1988-03-08 | Armstrong Jeffrey A | Partial eyeshield |
-
1956
- 1956-12-19 GB GB3874856A patent/GB842456A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729648A (en) * | 1986-11-10 | 1988-03-08 | Armstrong Jeffrey A | Partial eyeshield |
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