GB472448A - Improvements in or relating to photoelectric exposure meters - Google Patents
Improvements in or relating to photoelectric exposure metersInfo
- Publication number
- GB472448A GB472448A GB24495/36A GB2449536A GB472448A GB 472448 A GB472448 A GB 472448A GB 24495/36 A GB24495/36 A GB 24495/36A GB 2449536 A GB2449536 A GB 2449536A GB 472448 A GB472448 A GB 472448A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rays
- totally reflected
- light
- prism
- photo
- 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
- 239000011521 glass Substances 0.000 abstract 2
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/24—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0477—Prisms, wedges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/06—Restricting the angle of incident light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0204—Compact construction
- G01J1/0209—Monolithic
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Optical Elements Other Than Lenses (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
472,448. Photo - electric exposure meters. ZEISS IKON AKT.-GES. Sept. 8, 1936, No. 24495. Convention date, March 11. [Class 40 (iii)] For limiting the light falling on the cell of a photo-electric exposure meter to rays having an angle of incidence not exceeding a predetermined limit, at least two transparent bodies having a definite refractive index are arranged in the light path, and are separated by a medium of lower refractive index. Two glass prisms 2, 3 may be arranged as shown in Fig. 1, relatively to the light-sensitive layer 1. A ray b is totally reflected at the lower surface of the body 2, while a ray c, equally but oppositely inclined to the normal, passes into the body 3, but is totally reflected at the lower surface thereof. Rays having an angle of incidence below a certain maximum pass through both the prisms. The prism 2 may be replaced by a cone fitting into a conical recess in a body which replaces the prism 3, the light emerging through a conical recess in the latter body. This arrangement may be modified as shown in Fig. 3, by the insertion of a third glass body 8 in the inner recess, the whole assemblage acting as a plane plate for rays which are not totally reflected. The outer body 6 may have a convex surface, to serve as a lens.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE472448X | 1936-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB472448A true GB472448A (en) | 1937-09-23 |
Family
ID=6541421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24495/36A Expired GB472448A (en) | 1936-03-11 | 1936-09-08 | Improvements in or relating to photoelectric exposure meters |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT150109B (en) |
| CH (1) | CH194221A (en) |
| FR (2) | FR472448A (en) |
| GB (1) | GB472448A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0244092A1 (en) * | 1986-04-28 | 1987-11-04 | Sira Limited | Optical apparatus and method for examining an object |
| EP1092965A1 (en) * | 1999-10-14 | 2001-04-18 | Elop Electro-Optics Industries Ltd. | Numerical aperture limiter |
| WO2002010698A1 (en) * | 2000-07-28 | 2002-02-07 | Otsuka Electronics Co., Ltd. | Light spectrum detecting apparatus |
-
1914
- 1914-03-11 FR FR472448A patent/FR472448A/en not_active Expired
-
1936
- 1936-05-23 AT AT150109D patent/AT150109B/en active
- 1936-05-25 CH CH194221D patent/CH194221A/en unknown
- 1936-06-05 FR FR807085D patent/FR807085A/en not_active Expired
- 1936-09-08 GB GB24495/36A patent/GB472448A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0244092A1 (en) * | 1986-04-28 | 1987-11-04 | Sira Limited | Optical apparatus and method for examining an object |
| US4851696A (en) * | 1986-04-28 | 1989-07-25 | Sira Limited | Apparatus for receiving radiation only within predetermined angular limits |
| EP1092965A1 (en) * | 1999-10-14 | 2001-04-18 | Elop Electro-Optics Industries Ltd. | Numerical aperture limiter |
| SG87186A1 (en) * | 1999-10-14 | 2002-03-19 | Elop Electrooptics Ind Ltd | Numerical aperture limiter |
| US6624956B1 (en) | 1999-10-14 | 2003-09-23 | Elop Electro-Optics Industries | Numerical aperture limiter |
| WO2002010698A1 (en) * | 2000-07-28 | 2002-02-07 | Otsuka Electronics Co., Ltd. | Light spectrum detecting apparatus |
| US6859274B2 (en) | 2000-07-28 | 2005-02-22 | Otsuka Electronics Co., Ltd. | Light spectrum detecting apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| FR472448A (en) | 1914-12-04 |
| AT150109B (en) | 1937-07-10 |
| FR807085A (en) | 1937-01-04 |
| CH194221A (en) | 1937-11-30 |
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