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DE1029665B - Device for adjusting the aperture in photographic apparatus - Google Patents

Device for adjusting the aperture in photographic apparatus

Info

Publication number
DE1029665B
DE1029665B DES43811A DES0043811A DE1029665B DE 1029665 B DE1029665 B DE 1029665B DE S43811 A DES43811 A DE S43811A DE S0043811 A DES0043811 A DE S0043811A DE 1029665 B DE1029665 B DE 1029665B
Authority
DE
Germany
Prior art keywords
voltage
voltage divider
aperture
photographic apparatus
adjusting
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.)
Pending
Application number
DES43811A
Other languages
German (de)
Inventor
Dipl-Ing Fritz Weingaertner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
Priority to DES43811A priority Critical patent/DE1029665B/en
Publication of DE1029665B publication Critical patent/DE1029665B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G03B7/081—Analogue circuits
    • G03B7/085—Analogue circuits for control of aperture

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)

Description

Bei photographischen Aufnahmen ist es immer von Bedeutung, daß die Blendeneinstellung mit Rücksicht auf die Helligkeit des Objektes richtig gewählt wird. An der Unsicherheit, diese Bedingung zu erfüllen, liegt es, daß noch immer Fehlbelichtungen die häufigste Fehlerquelle sind. Die Überlegung des Erfinders richtet sich darauf, diese Fehler dadurch zu vermeiden, daß die Blendeneinstellung des photographischen Apparates in Abhängigkeit von der Helligkeit des Objektes selbsttätig vorgenommen wird.With photographic recordings it is always important that the aperture setting is taken into account is chosen correctly on the brightness of the object. In the uncertainty of fulfilling this condition, it is because incorrect exposures are still the most common source of errors. The inventor's consideration aims to avoid these errors by adjusting the aperture setting of the photographic Apparatus is made automatically depending on the brightness of the object.

Erfindungsgemäß kann dazu die Spannung eines Photoelements verstärkt zur Speisung eines Motors herangezogen werden, der die Blende und gleichzeitig einen Spannungsteiler so verstellt, daß die Spannung am Spannungsteiler die Ausgangsspannung des Verstärkers kompensiert. Der Motor, der die Verstellung der Blende vornimmt, wirkt also als Nullmotor, der nur so lange einen Strom in bestimmter Richtung erhält, wie die verstärkte Spannung der Photozelle durch die Spannung am Spannungsteiler nicht voll kompensiert ist.According to the invention, the voltage of a photo element can be increased to feed a motor be used, which adjusts the diaphragm and at the same time a voltage divider so that the voltage compensates the output voltage of the amplifier at the voltage divider. The engine that makes the adjustment the diaphragm, thus acts as a zero motor, which only as long as a current in a certain direction receives, as the increased voltage of the photocell by the voltage on the voltage divider is not fully is compensated.

Eine etwa notwendige besondere Charakteristik des Spannungsteilers kann dadurch erreicht werden, daß man die Windungen des Spannungsteilers ungleich verteilt. Man könnte auch durch eine geeignete Hebel- oder sonstige Übersetzung zwischen Blende und Potentiometerabgriff dasselbe erreichen.A possibly necessary special characteristic of the voltage divider can be achieved in that the turns of the voltage divider are distributed unevenly. One could also use a suitable lever or other translation between the aperture and the potentiometer tap can achieve the same thing.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt. Dort ist 1 die zur Helligkeitsfeststellung benutzte Photozelle. Die Spannung der Photozelle wird durch einen Verstärker 2 verstärkt. Diese verstärkte Spannung wird durch die Spannung eines von einer Batterie gespeisten Spannungsteilers über einen Stromkreis kompensiert, der einen Motor 4 enthält. Sofern die verstärkte Spannung richtig kompensiert ist, hat der Motor 4 keinen Strom. Er liegt an den Anschlußpunkten 8 und B und erhält einen Strom entsprechend der Differenz der Spannungen des Spannungsteilers 3 einerseits und des Verstärkers 2 andererseits, die zwischen den ^o Punkten A und 8 auftritt. Wenn der Motor 4 sich dreht, verstellt er durch eine Schnecke 5 die Blende 6 eines photographischen Objektivs. Gleichzeitig ver-Vorrichtung zur Blendeneinstellung
bei photographischen ApparatenAn embodiment of the invention is shown schematically in the drawing. There 1 is the photocell used to determine the brightness. The voltage of the photocell is amplified by an amplifier 2. This increased voltage is compensated for by the voltage of a voltage divider fed by a battery via a circuit which contains a motor 4. If the increased voltage is correctly compensated, the motor 4 has no current. It is connected to the connection points 8 and B and receives a current corresponding to the difference between the voltages of the voltage divider 3 on the one hand and the amplifier 2 on the other hand, which occurs between the ^ o points A and 8. When the motor 4 rotates, it moves the diaphragm 6 of a photographic lens by a screw 5. At the same time ver device for aperture adjustment
in photographic apparatus

Anmelder:
Siemens & Halske Aktiengesellschaft,Applicant:
Siemens & Halske Aktiengesellschaft,

Berlin und München,
München 2, Witteisbacherplatz 2Berlin and Munich,
Munich 2, Witteisbacherplatz 2

Dipl.-Ing. Fritz Weingärtner, Karlsruhe (Bad.),
ist als Erfinder genannt wordenDipl.-Ing. Fritz Weingärtner, Karlsruhe (Bad.),
has been named as the inventor

stellt er aber auch durch eine zweite Schnecke 7 den Schiebekontakt 8 auf dem Spannungsteiler 3. Das Maß der Verstellung der Blende hängt nun davon ab, wie die Widerstandswicklung des Spannungsteilers 3 gewickelt ist; denn die Verstellung des Motors 4 erfolgt bis zum völligen Abgleich der Spannungen zwischen den Punkten A und 8.but it also sets the sliding contact 8 on the voltage divider 3 by means of a second worm 7. The degree of adjustment of the diaphragm now depends on how the resistance winding of the voltage divider 3 is wound; because the adjustment of the motor 4 takes place until the voltages between points A and 8 are completely balanced.

Claims (2)

Patentansprüche:Patent claims: 1. Vorrichtung zur selbsttätigen Blendeneinstellung von photographischen Apparaten in Abhängigkeit von der Helligkeit des Objektes, dadurch gekennzeichnet, daß die Spannung des Photoelements verstärkt zur Speisung eines Motors dient, der die Blende und gleichzeitig einen Spannungsteiler so verstellt, daß dadurch die Ausgangsspannung des Verstärkers kompensiert wird.1. Device for automatic aperture adjustment of photographic apparatus as a function on the brightness of the object, characterized in that the voltage of the photo element is amplified to feed a motor serves, which adjusts the diaphragm and at the same time a voltage divider so that thereby the output voltage of the amplifier is compensated. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Spannungsteilerwicklung ungleich gewickelt ist.2. Apparatus according to claim 1, characterized in that the voltage divider winding is unevenly wound.
DES43811A 1955-05-05 1955-05-05 Device for adjusting the aperture in photographic apparatus Pending DE1029665B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES43811A DE1029665B (en) 1955-05-05 1955-05-05 Device for adjusting the aperture in photographic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES43811A DE1029665B (en) 1955-05-05 1955-05-05 Device for adjusting the aperture in photographic apparatus

Publications (1)

Publication Number Publication Date
DE1029665B true DE1029665B (en) 1958-05-08

Family

ID=7484879

Family Applications (1)

Application Number Title Priority Date Filing Date
DES43811A Pending DE1029665B (en) 1955-05-05 1955-05-05 Device for adjusting the aperture in photographic apparatus

Country Status (1)

Country Link
DE (1) DE1029665B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE650193C (en) * 1937-09-13 Oedoen Riszdorfer Dr Lens diaphragm for photographic cameras moved by the current of a photocell
DE673011C (en) * 1935-10-17 1939-03-14 Wilhelm Zuegel Automatic aperture regulator for photographic or cinematographic lenses
US2193325A (en) * 1934-03-16 1940-03-12 Riszdorfer Odon Apparatus for light control
DE712737C (en) * 1935-02-23 1941-10-24 Wilhelm Zuegel Photographic or cinematographic camera with a lens diaphragm that is automatically controlled by a dimmable photoelectric element
DE737160C (en) * 1938-03-15 1943-07-07 Metrawatt Ag Fabrik Elek Scher Photoelectric light meter
DE741845C (en) * 1931-01-28 1943-11-18 Oedoen Riszdorfer Dr Photographic camera with lens aperture, adjustable shutter and an electric light meter
US2412424A (en) * 1944-05-12 1946-12-10 Rath Karl Photoelectric control device for camera diaphragms
DE848595C (en) * 1950-07-09 1952-09-04 Zeiss Ikon Ag Roll film camera, in particular 35mm camera, with built-in electrical exposure meter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE650193C (en) * 1937-09-13 Oedoen Riszdorfer Dr Lens diaphragm for photographic cameras moved by the current of a photocell
DE741845C (en) * 1931-01-28 1943-11-18 Oedoen Riszdorfer Dr Photographic camera with lens aperture, adjustable shutter and an electric light meter
US2193325A (en) * 1934-03-16 1940-03-12 Riszdorfer Odon Apparatus for light control
DE712737C (en) * 1935-02-23 1941-10-24 Wilhelm Zuegel Photographic or cinematographic camera with a lens diaphragm that is automatically controlled by a dimmable photoelectric element
DE673011C (en) * 1935-10-17 1939-03-14 Wilhelm Zuegel Automatic aperture regulator for photographic or cinematographic lenses
DE737160C (en) * 1938-03-15 1943-07-07 Metrawatt Ag Fabrik Elek Scher Photoelectric light meter
US2412424A (en) * 1944-05-12 1946-12-10 Rath Karl Photoelectric control device for camera diaphragms
DE848595C (en) * 1950-07-09 1952-09-04 Zeiss Ikon Ag Roll film camera, in particular 35mm camera, with built-in electrical exposure meter

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