DE687272C - Device for limiting the angle of incidence of light in light-sensitive cells of photoelectric light meters - Google Patents
Device for limiting the angle of incidence of light in light-sensitive cells of photoelectric light metersInfo
- Publication number
- DE687272C DE687272C DE1937Z0024220 DEZ0024220D DE687272C DE 687272 C DE687272 C DE 687272C DE 1937Z0024220 DE1937Z0024220 DE 1937Z0024220 DE Z0024220 D DEZ0024220 D DE Z0024220D DE 687272 C DE687272 C DE 687272C
- Authority
- DE
- Germany
- Prior art keywords
- light
- cell
- incidence
- angle
- limiting
- 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
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
Einrichtung zur Begrenzung des Lichteinfallswinkels bei lichtempfindlichen Zellen photoelektrischer Belichtungsmesser Die Erfindung bezieht sich auf eine Einrichtung zur Begrenzung der einfallenden Lichtstrahlen bei photoelektrischen Belichtungsmessern durch totalreflektierende Mittel.Device for limiting the angle of incidence of light in photosensitive Photoelectric Light Meter Cells The invention relates to a device to limit the incident light rays in photoelectric light meters by totally reflective means.
Die Verwendung totalreflektierender Mittel zur Leitung von Lichtstrahlen stellt an sich nichts Neues dar. So ist es bereits bekannt, ein Ringprisma zur Bildwinkelbegrenzung bei lichtelektrischen Belichtungsmessern zu verwenden. Bei dieser Einrichtung werden jedoch alle Strahlen, die über einen bestimmten Winkel hinausgehen, durch Totalreflexion ausgeschieden. Solche Einrichtungen besitzen jedoch den Nachteil, daß der Winkelbereich der auf die Zelle gelangenden Lichtstrahlen noch zu groß ist. Ferner ist es bekannt, den gesamten Lichtstrom durch spiegelnde Flächen einem photographischen Schichtträger, dessen Schicht der Lichteinfallsrichtung abgekehrt ist, zuzuführen.The use of totally reflective means to guide light rays is nothing new in itself. It is already known to use a ring prism for limiting the angle of view to be used with photoelectric light meters. Be at this facility however, all rays that go beyond a certain angle are due to total internal reflection eliminated. However, such devices have the disadvantage that the angular range the light rays reaching the cell is still too large. It is also known the entire luminous flux through reflective surfaces on a photographic substrate, the layer of which is turned away from the direction of incidence of light.
Die im nachfolgenden beschriebene Erfindung zeigt eine Einrichtung, bei der der Bildwinkel der auf die Zelle auftreffenden Strahlen auf ein erträgliches, gegenüber den sonstigen Einrichtungen kleineres Maß heruntergedrückt wird. Dies wird erfindungsgemäß dadurch erreicht, daß nicht wie in früheren Fällen die Strahlen über einen bestimmte Winkel durch Totalreflexion für die Zelle unwirksam gemacht werden, sondern daß Lichtstrahlen von bestimmter Neigung durch zweifache Totalreflexion einer Zelle zugeführt werden, deren lichtempfindliche Schicht der Lichteinfallsrichtung abgekehrt ist. Die Zelle erhält somit kein direktes Licht. Da die Totalreflexion in einem engen Winkelbereich erfolgt, ist es also möglich, einen gegenüber den bekannten Einrichtungen äußerst engen Meßwinkel für die Zellenbestrahlung zu erreichen. Als totalreflektierende Mittel werden gemäß weiterer Ausgestaltung dieser Erfindung ein rechtwinkliges Ringprisma oder zwei geradlinige rechtwinklige Prismen, deren brechende Kanten parallel verlaufen, verwendet. The invention described below shows a device in which the angle of view of the rays hitting the cell on a tolerable, Compared to the other facilities, a smaller amount is depressed. this is achieved according to the invention that not, as in previous cases, the rays over a certain angle made ineffective for the cell by total internal reflection but that rays of light of a certain inclination by double total reflection are fed to a cell, the light-sensitive layer of the light incidence direction turned away is. The cell therefore receives no direct light. Since the Total internal reflection occurs in a narrow angular range, so it is possible to use a compared to the known devices extremely narrow measuring angle for cell irradiation to reach. As a totally reflective means, according to a further embodiment of this invention a right-angled ring prism or two rectilinear right-angled ones Prisms whose refracting edges are parallel used.
In der Zeichnung ist die Erfindung in Abb. I bis 5 in zwei Ausführungsbeispielen dargestellt. In the drawing, the invention is shown in Fig. I to 5 in two embodiments shown.
Abb. I bis 3 zeigen eine Ausführungsform, bei der ein kegelförmig ausgebildetes Ringprisma Verwendung findet. In Abb. 1 ist dieses Prisma mit der photoelektrischen Zelle in Verbindung mit einem elektrischen Schaltschema gezeigt. I ist das Ringprisma, z ist die photoelektrische Zelle mit der dahinter befindlichen Seienschicht 3, 4 ist das Meßinstrument und 5 der Reigulierwiderstands Abb. 2 und 3 zeigen das Ringprisma in vergrößertem Maßstäbe mit eingezeichneten Strahlengängen. Hieraus kann man ersehen, daß in der Hauptsache nur die Strahlen a der Zelle zugeführt werden, während die Strahlen b ungehindert durch das Prisma treten. Die Strahlen c werden nach einmaliger Totalreflexion ebenfalls herausgebrochen und damit für die Zelle unwirksam gunacht. Fig. I to 3 show an embodiment in which a conical formed ring prism is used. In Fig. 1 this prism is with the photoelectric cell shown in connection with an electrical circuit diagram. I is the ring prism, z is the photoelectric cell with the one behind it Side layer 3, 4 is the measuring instrument and 5 is the regulating resistance Fig. 2 and 3 show the ring prism on an enlarged scale with drawn beam paths. From this it can be seen that in the main only the rays a are introduced into the cell while the rays b pass unhindered through the prism. The Rays c are also broken out after a one-time total reflection and thus for the cell is ineffective.
In Abb. 4 und 5 ist ein weiteres Ausführungsbeispiel der Erfindung dargestellt, bei der statt eines kegelförmig ausgebildeten Ringprismas zwei nebcneinanderliebrende geradlinig verlaufende rechtwinklige Prismen 6, 7 Verwendung finden. Die photoelektrische Zelle 2 kann dadurch rechteckige Form erhalten. In Figs. 4 and 5 is another embodiment of the invention shown in which, instead of one conical ring prism, two adjacent one another rectilinear right-angled prisms 6, 7 are used. The photoelectric Cell 2 can be given a rectangular shape.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1937Z0024220 DE687272C (en) | 1937-11-13 | 1937-11-13 | Device for limiting the angle of incidence of light in light-sensitive cells of photoelectric light meters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1937Z0024220 DE687272C (en) | 1937-11-13 | 1937-11-13 | Device for limiting the angle of incidence of light in light-sensitive cells of photoelectric light meters |
Publications (1)
Publication Number | Publication Date |
---|---|
DE687272C true DE687272C (en) | 1940-01-26 |
Family
ID=7626100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1937Z0024220 Expired DE687272C (en) | 1937-11-13 | 1937-11-13 | Device for limiting the angle of incidence of light in light-sensitive cells of photoelectric light meters |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE687272C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1224528B (en) * | 1962-09-13 | 1966-09-08 | Rollei Werke Franke Heidecke | Illumination optics for photoelectric cells or photoresistors |
-
1937
- 1937-11-13 DE DE1937Z0024220 patent/DE687272C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1224528B (en) * | 1962-09-13 | 1966-09-08 | Rollei Werke Franke Heidecke | Illumination optics for photoelectric cells or photoresistors |
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