DE2943474C2 - Measuring probe - Google Patents
Measuring probeInfo
- Publication number
- DE2943474C2 DE2943474C2 DE19792943474 DE2943474A DE2943474C2 DE 2943474 C2 DE2943474 C2 DE 2943474C2 DE 19792943474 DE19792943474 DE 19792943474 DE 2943474 A DE2943474 A DE 2943474A DE 2943474 C2 DE2943474 C2 DE 2943474C2
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- housing
- measuring probe
- density
- optics
- 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
- 239000000523 sample Substances 0.000 title claims description 14
- 239000005337 ground glass Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000001739 density measurement Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 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
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
- G01J1/4223—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for copy - or printing apparatus
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
- G03B27/725—Optical projection devices wherein the contrast is controlled electrically (e.g. cathode ray tube masking)
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/099—Arrangement of photoelectric elements in or on the camera
- G03B7/09908—Arrangement of photoelectric elements in or on the camera on the camera or in the objective
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
Die Erfindung betrifft eine Meßsonde gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a measuring probe according to the preamble of claim 1.
Um eine Dichtemessung in der Meßebene der Mattscheibe, d. h. dort, wo sich später das zu belichtende Material befindet, zu ermöglichen, ist die Meßsonde nach der Hauptanmeldung derart ausgebildet, daß im Gehäuse unmittelbar hinter der Meßöffnung und vor dem Empfänger ein optisches System mit einem Öffnungswinkel angeordnet ist, der größer ist als der größte Feldwinkel der Reproduktionskamera.In order to enable a density measurement in the measuring plane of the ground glass screen, i.e. where the material to be exposed is later located, the measuring probe according to the main application is designed in such a way that an optical system with an aperture angle that is larger than the largest field angle of the reproduction camera is arranged in the housing immediately behind the measuring opening and in front of the receiver.
Bei solchen Dichtemessungen ist auch der Streulichteinfluß zu berücksichtigen, das sich bei sehr kleinen dunklen Meßflächen in hellem Umfeld besonders stark auswirkt, d. h. der gemessene Dichtewert eines solchen Meßpunktes entspricht, beeinflußt durch das helle Umfeld, nicht genau seiner tatsächlichen Dichte, wie sie gemessen und angezeigt würde, wenn der Meßfleck eine größere Flächenabmessung hätte und demgemäß ein helles Umfeld nicht so stark in die Messung eingehen kann.In such density measurements, the influence of scattered light must also be taken into account, which has a particularly strong effect on very small, dark measuring surfaces in a bright environment, i.e. the measured density value of such a measuring point, influenced by the bright environment, does not correspond exactly to its actual density, as it would be measured and displayed if the measuring spot had a larger surface dimension and accordingly a bright environment cannot have such a strong impact on the measurement.
In der Hauptanmeldung ist deshalb schon mit einer vorteilhaften Ausbildung dahingehend vorgeschlagen worden, die Blende gegen seitlich versetzte Blendenöffnungen zur Streulichterfassung austauschbar anzuordnen, wodurch der Streuchlichteinfluß erfaßt und zur rechnerischen Meßwertkorrektur verwendet werden kann, wenn man in einem getrennten Meßvorgang Blendenöffnungen benutzt, die z. B. auf einem Kreis um die eigentliche Blende angeordnet sind.In the main application, therefore, it has already been proposed with an advantageous embodiment to arrange the diaphragm so that it can be exchanged for laterally offset diaphragm openings for detecting stray light, whereby the influence of stray light can be detected and used for computational measurement value correction if diaphragm openings are used in a separate measuring process, which are arranged, for example, on a circle around the actual diaphragm.
Aufgabe der Erfindung ist es, für die Dichte-Messung solcher kleinen Meßflecke mit hellem Umfeld eine einfachere Lösung vorzuschlagen. Die Lösung wird darin gesehen, daß das optische System der Optik und der Empfänger als im Gehäuse axial verstellbare Einheit ausgebildet ist.The object of the invention is to propose a simpler solution for the density measurement of such small measuring spots with bright surroundings. The solution is seen in the fact that the optical system of the optics and the receiver are designed as an axially adjustable unit in the housing.
Bei dieser Ausbildung wird zunächst der eigentliche Meßfleck durch eine 1 : 1 Abbildung auf dem lichtempfindlichen Element gemessen (Ds-Messung) und danach wird nach axialer Verschiebung des optischen Systems zusätzlich das Umfeld des Meßfleckes erfaßt, d. h. es wird nur die Gegenstandsweite verändert und eine unscharfe Abbildung des Meßfleckes erhalten (Du-Messung). Der "wahre" Dichte-Meßwert (Dw), den zu ermitteln anzustreben ist, wird dann durch entsprechende Berechnung aus der ermittelten Dichte (Ds) des eigentlichen Meßpunktes und aus der ermittelten Dichte (Du) des helleren Umfeldes ermittelt.In this design, the actual measuring spot is first measured by a 1:1 image on the light-sensitive element (Ds measurement) and then, after axial displacement of the optical system, the surroundings of the measuring spot are also recorded, ie only the object distance is changed and a blurred image of the measuring spot is obtained (Du measurement). The "true" density measurement value (Dw) that is to be determined is then determined by appropriate calculation from the determined density (Ds) of the actual measuring point and from the determined density (Du) of the brighter surroundings.
Eine praktische und vorteilhafte Ausführungsform der Meßsonde würde darin bestehen, daß auf der Außenumfangsfläche des Gehäuses ein zwischen zwei Anschlägen verschieblicher Stellring angeordnet und dieser über einen Mitnehmer, der die Gehäusewand in einem Längsschlitz durchgreift, mit der Einheit verbunden ist.A practical and advantageous embodiment of the measuring probe would consist in that an adjusting ring which can be moved between two stops is arranged on the outer peripheral surface of the housing and is connected to the unit via a driver which passes through the housing wall in a longitudinal slot.
Die erfindungsgemäße Meßsonde wird nachfolgend anhand der zeichnerischen Darstellung eines Ausführungsbeispieles näher erläutert. Es zeigtThe measuring probe according to the invention is explained in more detail below using the drawing of an embodiment. It shows
Fig. 1 einen Längsschnitt durch die Meßsonde; Fig. 1 shows a longitudinal section through the measuring probe;
Fig. 2 schematisch der Strahlengang bei Erfassung des helleren Umfeldes und Fig. 2 schematically shows the beam path when capturing the brighter surroundings and
Fig. 3 eine graphische Kurvendarstellung der Dichtemeßwerte in Abhängigkeit von der Flächengröße des Meßfleckes. Fig. 3 is a graphical representation of the density measurement values as a function of the area size of the measuring spot.
Gemäß Fig. 1 ist im Gehäuse die ganze aus dem optischen System 3 und dem lichtelektrischen Empfänger 3&min; (bestehend aus Photozelle 31 und nachgeschalteter Umsetzelektrode 32) gebildete Einheit 24 im Gehäuse 1 der Meßsonde axial verschieblich gelagert, welche Axialverschiebung mittels eines Stellringes 27 bewirkt wird, der auf der Außenumfangsfläche 29 des Gehäuses 1 sitzt und zwischen zwei fest, aber einstellbar am Gehäuse 1 angerodneten, ringförmigen Anschläge 25, 26 verschieblich ist. Die Mitnahme der Einheit 24 erfolgt durch einen Mitnehmer 28, der den Stellring 27 und die Einheit 24 verbindet und das Gehäuse 1 in einem entsprechend langen Längsschlitz durchgreift.According to Fig. 1, the entire unit 24 formed from the optical system 3 and the photoelectric receiver 3' (consisting of photocell 31 and downstream conversion electrode 32 ) is mounted in the housing 1 of the measuring probe so that it can be moved axially, which axial displacement is brought about by means of an adjusting ring 27 which sits on the outer circumferential surface 29 of the housing 1 and is movable between two ring-shaped stops 25, 26 which are fixed but adjustable on the housing 1. The unit 24 is driven by a driver 28 which connects the adjusting ring 27 and the unit 24 and reaches through the housing 1 in a correspondingly long longitudinal slot.
Gemäß Fig. 2 wird mit der beschriebenen und auf die Mattscheibe 16 aufgesetzte Meßsonde einmal der Meßfleck 17 gemessen (Dichte Ds) und zwar in der Fläche 16&min; der Mattscheibe 16, in der sich später das zu belichtende Material befindet.According to Fig. 2, the measuring spot 17 is measured once (density Ds) using the measuring probe described and placed on the ground glass screen 16 , namely in the area 16' of the ground glass screen 16 in which the material to be exposed will later be located.
Nach entsprechender Verschiebung der Einheit 24 innerhalb der an Ort und Stelle verbleibenden Meßsonde, wird das ganze hellere Umfeld 17&min; erfaßt und auch dessen Dichte (Du).After a corresponding displacement of the unit 24 within the measuring probe remaining in place, the entire brighter environment 17' is detected and also its density (Du) .
Graphisch stellen sich die unterschiedlichen Dichtewerte von Meßflächen unterschiedlicher Flächengrößen und deren Umfelder gemäß Fig. 3 dar, woraus erkennbar wird, daß die Dichtewerte bei kleiner werdenden Flächen stark abfallen und sich der Einfluß heller Umfelder stärker bemerkbar macht, während sich bei größeren Meßflächen die Kurven an den für die Belichtungseinstellung wahren und insoweit idealen Dichtemeßwert (Dw) annähern.The different density values of measuring surfaces of different sizes and their surroundings are shown graphically in Fig. 3, from which it can be seen that the density values drop sharply as the areas become smaller and the influence of bright surroundings becomes more noticeable, while for larger measuring surfaces the curves approach the true and therefore ideal density measurement value (Dw) for the exposure setting.
Aus den ermittelten Dichtemeßwerten Ds und Du läßt sich nun der für die einzustellende Belichtung maßgebende wahre Dichtewerte Dw ohne weiteres ermitteln, und zwar angenähert durch die Formel
- D w = D s + K (Ds - Du)
worin K einen Faktor darstellt, der sich nach gerätespezifischen Einflußgrößen richtet.From the measured density values Ds and Du, the true density value Dw , which is decisive for the exposure to be set, can now be easily determined, approximately by the formula
- D w = D s + K (Ds - Du)
where K represents a factor that depends on device-specific influencing factors.
Durch die beschriebene Ausbildung der Meßsonde kann also vorteilhaft und ohne die vorerwähnte Blendenmanipulation bei Verbleib der Meßsonde an entsprechender Stelle der Mattscheibe einerseits ein in seiner Flächenausdehnung kleiner Meßfleck und andererseits aber auch dessen einflußnehmendes helles Umfeld erfaßt und beide Dichtemeßwerte nach zusammenfassender Berechnung zum für die Belichtung maßgebenden Dichtewert Dw umgesetzt werden.The described design of the measuring probe allows advantageous and without the aforementioned aperture manipulation when the measuring probe remains at the corresponding At each point on the ground glass, a small measuring spot is recorded in terms of its surface area and, on the other hand, its influencing bright surroundings are recorded and, after a summary calculation, both density measurements are converted into the density value Dw which is decisive for the exposure.
Claims (2)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792943474 DE2943474C2 (en) | 1979-06-22 | 1979-10-27 | Measuring probe |
| DK259480A DK259480A (en) | 1979-06-22 | 1980-06-18 | MEALESONDE |
| CH4743/80A CH647866A5 (en) | 1979-06-22 | 1980-06-20 | MEASURING PROBE FOR DENSITY MEASUREMENT IN THE FILTER DISC LEVEL OF A REPRODUCTION CAMERA. |
| GB8020523A GB2062894B (en) | 1979-06-22 | 1980-06-23 | Optical density measuring device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2925188A DE2925188C2 (en) | 1979-06-22 | 1979-06-22 | Measuring probe for density measurement of original images |
| DE19792943474 DE2943474C2 (en) | 1979-06-22 | 1979-10-27 | Measuring probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2943474A1 DE2943474A1 (en) | 1981-05-21 |
| DE2943474C2 true DE2943474C2 (en) | 1987-04-23 |
Family
ID=25779621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19792943474 Expired DE2943474C2 (en) | 1979-06-22 | 1979-10-27 | Measuring probe |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH647866A5 (en) |
| DE (1) | DE2943474C2 (en) |
| DK (1) | DK259480A (en) |
| GB (1) | GB2062894B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3723701A1 (en) * | 1987-07-17 | 1989-02-02 | Krzyminski Harald | HAND MEASURING DEVICE FOR OPTICAL REFLECTION MEASUREMENT |
-
1979
- 1979-10-27 DE DE19792943474 patent/DE2943474C2/en not_active Expired
-
1980
- 1980-06-18 DK DK259480A patent/DK259480A/en not_active Application Discontinuation
- 1980-06-20 CH CH4743/80A patent/CH647866A5/en not_active IP Right Cessation
- 1980-06-23 GB GB8020523A patent/GB2062894B/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| NICHTS-ERMITTELT |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2062894B (en) | 1984-03-07 |
| GB2062894A (en) | 1981-05-28 |
| CH647866A5 (en) | 1985-02-15 |
| DE2943474A1 (en) | 1981-05-21 |
| DK259480A (en) | 1980-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AF | Is addition to no. |
Ref country code: DE Ref document number: 2925188 Format of ref document f/p: P |
|
| 8110 | Request for examination paragraph 44 | ||
| AF | Is addition to no. |
Ref country code: DE Ref document number: 2925188 Format of ref document f/p: P |
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| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8340 | Patent of addition ceased/non-payment of fee of main patent |