GB622107A - Improvements in or relating to prisms for optical instruments - Google Patents
Improvements in or relating to prisms for optical instrumentsInfo
- Publication number
- GB622107A GB622107A GB7882/46A GB788246A GB622107A GB 622107 A GB622107 A GB 622107A GB 7882/46 A GB7882/46 A GB 7882/46A GB 788246 A GB788246 A GB 788246A GB 622107 A GB622107 A GB 622107A
- Authority
- GB
- United Kingdom
- Prior art keywords
- face
- light
- prism
- parallel
- prisms
- 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
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Viewfinders (AREA)
Abstract
622,107. Prisms. SORDOILLET, P. March 13, 1946, No. 7882. Convention date, March 13, 1945. [Class 97 (i)] A glass prism is inserted between the object lens 12 and the eyepiece 18 of an optical instrument, e.g. field glasses, so that the light passing through the object lens is incident normally on the face 3<SP>1</SP> of the prism. After passing through this face undeviated, the light is reflected at an inclined flat face 4 on to a surface 3<SP>2</SP>, parallel to surface 3<SP>1</SP>, and is then directed on to the silvered portion 9 of a face 2<SP>1</SP>, which is parallel to the optical axis of the instrument and which reflects the light onto the silvered portion 10 of the face 2<SP>2</SP>. Face 2<SP>2</SP> is parallel to the face 2<SP>1</SP> and reflects the light on to a roof-shaped face 6 whereby it is reflected through surface 3<SP>2</SP> on to the eyepiece 18. The light rays thus avoid the central part of the prism, which may have a central cavity 19 to reduce the weight of the prism and to allow the insertion therein of a fixing member.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR622107X | 1945-03-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB622107A true GB622107A (en) | 1949-04-27 |
Family
ID=8985608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7882/46A Expired GB622107A (en) | 1945-03-13 | 1946-03-13 | Improvements in or relating to prisms for optical instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB622107A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988057A (en) * | 1974-10-29 | 1976-10-26 | Kaptron, Inc. | Prism reflector for optical projector/reader |
-
1946
- 1946-03-13 GB GB7882/46A patent/GB622107A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988057A (en) * | 1974-10-29 | 1976-10-26 | Kaptron, Inc. | Prism reflector for optical projector/reader |
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