GB475776A - Improvements in or relating to condenser lens systems - Google Patents
Improvements in or relating to condenser lens systemsInfo
- Publication number
- GB475776A GB475776A GB14696/37A GB1469637A GB475776A GB 475776 A GB475776 A GB 475776A GB 14696/37 A GB14696/37 A GB 14696/37A GB 1469637 A GB1469637 A GB 1469637A GB 475776 A GB475776 A GB 475776A
- Authority
- GB
- United Kingdom
- Prior art keywords
- axis
- filament
- light
- sound
- area
- 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
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
475,776. Modulating light. ELECTRICAL RESEARCH PRODUCTS, Inc. May 27, 1937, No. 14696. Convention date, June 1, 1936. [Class 40 (iii)] [Also in Group XX] A condenser lens system for projecting light from a helical coil filament 2 on to a particular area, particularly for sound recording and monitoring apparatus, comprises a cylindrical lens 5 approximately midway between the spherical components 3, 4 of the condenser, the lenses being so arranged that the filament is sharply in focus on the said area in a direction at right-angles to the axis of the filament, Fig. 1, and is slightly out of focus in a direction parallel to the said axis, Fig. 2. As shown, the lens 5 is plano-cylindrical, the axis of the cylinder being at right-angles to the axis of the filament. As applied to sound-recording apparatus, the area on which the light is received is a light valve comprising a variable slit 8 between ribbons 10, 11. Part of the light beam outside the axial portion is used for monitoring the sound-recording operation by means of reflectors 12, 13.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US475776XA | 1936-06-01 | 1936-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB475776A true GB475776A (en) | 1937-11-25 |
Family
ID=21949776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14696/37A Expired GB475776A (en) | 1936-06-01 | 1937-05-27 | Improvements in or relating to condenser lens systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB475776A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2738708A (en) * | 1952-06-28 | 1956-03-20 | Scopicon Inc | Microscope-illumination device |
-
1937
- 1937-05-27 GB GB14696/37A patent/GB475776A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2738708A (en) * | 1952-06-28 | 1956-03-20 | Scopicon Inc | Microscope-illumination device |
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