GB346902A - Improvements in or relating to optical systems - Google Patents
Improvements in or relating to optical systemsInfo
- Publication number
- GB346902A GB346902A GB5178/30A GB517830A GB346902A GB 346902 A GB346902 A GB 346902A GB 5178/30 A GB5178/30 A GB 5178/30A GB 517830 A GB517830 A GB 517830A GB 346902 A GB346902 A GB 346902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slit
- feb
- curved
- optical
- relating
- 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
- G02B13/00—Optical objectives specially designed for the purposes specified below
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Photoreceptors In Electrophotography (AREA)
Abstract
346,902. Optical apparatus. BAUSCH & LOMB OPTICAL CO., 635, St. Paul Street, Rochester, New York, U.S.A. Feb. 15, 1930, No. 5178. Convention date, Feb. 25, 1929. [Class 97 (i).] Apparatus for photographically recording sound includes an arcuately curved slit lying in an axial plane and concave in the direction of projection so that the projected image is substantially free from curvature of field. The arrangement is shown diagrammatically in Fig. 11. As shown in Fig. 4, the slit unit 14 comprises a supporting disc 16, mounted on the inner side of which are two curved jaws 18, 181 held in place by screws and retaining members 21, 211, defining a narrow curved slit 22. A modified form consists of a spherical or cylindrical glass member covered with an opaque coating, a portion of which is removed to form the slit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US346902XA | 1929-02-25 | 1929-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB346902A true GB346902A (en) | 1931-04-23 |
Family
ID=21877987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5178/30A Expired GB346902A (en) | 1929-02-25 | 1930-02-15 | Improvements in or relating to optical systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB346902A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3504960A (en) * | 1966-10-11 | 1970-04-07 | Xerox Corp | Sagittal ray aperture stop |
-
1930
- 1930-02-15 GB GB5178/30A patent/GB346902A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3504960A (en) * | 1966-10-11 | 1970-04-07 | Xerox Corp | Sagittal ray aperture stop |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB348123A (en) | Improvements in or relating to projection apparatus | |
SE7907779L (en) | DEVICE FOR DECENTERATION OF CORRECTION GLASS GLASS AND APPLICATION | |
GB346902A (en) | Improvements in or relating to optical systems | |
GB354843A (en) | Improvements in or relating to kinematograph apparatus | |
GB618253A (en) | Improvements in or relating to optical objectives | |
GB522148A (en) | Improvements in apparatus for examining eyes for refractive errors | |
GB415177A (en) | Improved equipment for the recording of sound on talking picture films | |
GB335864A (en) | Improvements in kinematograph and other optical projection systems | |
GB154222A (en) | Improvements in or relating to cinematograph projection apparatus | |
GB830954A (en) | Improvements in and relating to photographic projection printers | |
GB387776A (en) | Apparatus for reading a divided circle | |
GB541155A (en) | Improvements relating to the optical projection of images | |
GB385016A (en) | Improvements in or relating to film-guiding mechanism | |
GB208071A (en) | Improvement relating to kinematograph projection apparatus | |
GB347946A (en) | Improvements in photographic apparatus | |
GB357994A (en) | Improvements in or relating to apparatus for recording or reproducing sound | |
GB243893A (en) | Method of and means for illuminating pictures and other representations and articlesfor the purpose of enlargement or reduction by optical means | |
GB1391693A (en) | System and device for overhead projection | |
GB506965A (en) | An optical system for use in recording or reproducing sound on film | |
GB805226A (en) | Improvements in or relating to optical projectors | |
GB829692A (en) | Improvements in or relating to optical projection apparatus | |
GB461259A (en) | Improvements in or relating to optical systems for use in recording and reproducing sound on films | |
GB361939A (en) | Means for illuminating a surface to be projected | |
GB701396A (en) | Improvements in or relating to optical systems | |
GB693199A (en) | Improvements in illuminating apparatus for use in photographically copying coloured originals by contact or projection printing |