DE892911C - TV camera with a picture tube for observing the scanned image field - Google Patents

TV camera with a picture tube for observing the scanned image field

Info

Publication number
DE892911C
DE892911C DET5224D DET0005224D DE892911C DE 892911 C DE892911 C DE 892911C DE T5224 D DET5224 D DE T5224D DE T0005224 D DET0005224 D DE T0005224D DE 892911 C DE892911 C DE 892911C
Authority
DE
Germany
Prior art keywords
camera
image
observing
tube
scanned image
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
Application number
DET5224D
Other languages
German (de)
Inventor
Rudolf Urtel
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Priority to DET5224D priority Critical patent/DE892911C/en
Application granted granted Critical
Publication of DE892911C publication Critical patent/DE892911C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/53—Constructional details of electronic viewfinders, e.g. rotatable or detachable

Description

Fernsehkamera mit einer Bildröhre zur Beobachtung des abgetasteten Bildfeldes Beim Fernsehen ist es bekannt, an der Stelle der Bildabtastung ein Kontrollbild sichtbar zu machen, indem die Bildsignalspannungen entweder direkt hinter dem Niederfrequenzverstärker oder kurz vor der Ausstrahlung nach Gleichrichtung abgenommen und auf das zur Kontrolle dienende Wiedergabeorgan gegeben werden. Ferner ist bereits vorgeschlagen worden, bei einer Fernsehkamera, die eine Kathodenstrahlbildfängerröhre besitzt, zur Beobachtung der Lage des abgetasteten Bildfeldes auf dem Schirm der Bildfängerröhre in der Kamera eine Bildwiedergaberöhre anzubringen, der die Bildhelligkeitssignale vom Verstärkergestell aus zugeführt werden. Gemäß der Erfindung sollen die von der Bildfängerröhre gelieferten Bildhelligkeitssignale niederfrequent zum Verstärkergestell übertragen, dort mit sogenannten Austastspannungen (zur Strahlsperrung in .der Bildfängerröhre während der Sägezahnrückläufe) versehen und dann trägerfrequent zur Kamera übermittelt werden. Eine Änderung des Kamerakabels ist für diese Einrichtung selbst gegenüber dem Fall, bei dem gar keine Bildwiedergaberöhre im oben erläuterten Sinne in der Kamera vorhanden war, nicht notwendig. Es bereitet vielmehr keine grundsätzlichen Schwierigkeiten, die Bildhelligkeitssignale zusammen mit den Austastspannungen auf demselben Kabel, das auch zur Übermittlung der Bildhelligkeitssignale von der Bil'dfängerröhre an das Verstärkergestell dient, unter Benutzung einer Trägerfrequenz zur Bildwiedergaberöhre zurückzuübertragen.TV camera with a picture tube for observation of the scanned Image field In television, it is known to use a control image at the point of image scanning to make visible by the image signal voltages either directly behind the low frequency amplifier or removed shortly before the broadcast after rectification and on that for control serving playback organ are given. It has also been suggested that in a television camera having a cathode ray image capture tube for observation the position of the scanned image field on the screen of the image capture tube in the camera to attach a picture display tube, which receives the picture brightness signals from the amplifier frame are fed out. According to the invention, the should be provided by the image capture tube Image brightness signals transmitted at low frequency to the amplifier frame, there with so-called blanking voltages (to block the beam in the image capture tube during the sawtooth returns) and then transmitted to the camera at carrier frequency. A change of the camera cable is for this facility itself compared to the case in which there is no picture display tube in the camera in the sense explained above was not necessary. Rather, it does not cause any fundamental difficulties the image brightness signals along with the blanking voltages on the same cable, that too Transmission of the image brightness signals from the image catcher tube serves to the amplifier frame, using a carrier frequency for the picture display tube retransmit.

Claims (1)

PATENTANSPRUCH: Fernsehkamera mit Kathodenstrahlbildfängerröhre und einer in der Kamera angebrachten Bildwiedergaberöhre zur Beobachtung des abgetasteten Bildfeldes, dadurch gekennzeichnet, daß die Bildhelligkeitssignale von der Bldfängerröhre zum Verstärkergestell als Niederfrequenz übertragen, dort mit Austastspannungen zur Strahlsperrung während des Strahlrücklaufes versehen und dann über dasselbe Kabel von dem Gestell zur Kamera zurück mittels Trägerfrequenz übertragen werden. Angezogene Druckschriften: Französische Patentschriften N1.652, 125,743 o61.PATENT CLAIM: TV camera with cathode ray image capture tube and a picture display tube attached to the camera for observing the scanned image Image field, characterized in that the image brightness signals from the image catcher tube transmitted to the amplifier rack as low frequency, there with blanking voltages to block the jet during the jet return and then over the same Cables are transmitted back from the frame to the camera by means of carrier frequency. Cited pamphlets: French patents N1.652, 125.743 o61.
DET5224D 1939-03-29 1939-03-29 TV camera with a picture tube for observing the scanned image field Expired DE892911C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET5224D DE892911C (en) 1939-03-29 1939-03-29 TV camera with a picture tube for observing the scanned image field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET5224D DE892911C (en) 1939-03-29 1939-03-29 TV camera with a picture tube for observing the scanned image field

Publications (1)

Publication Number Publication Date
DE892911C true DE892911C (en) 1953-10-12

Family

ID=7544934

Family Applications (1)

Application Number Title Priority Date Filing Date
DET5224D Expired DE892911C (en) 1939-03-29 1939-03-29 TV camera with a picture tube for observing the scanned image field

Country Status (1)

Country Link
DE (1) DE892911C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR652125A (en) * 1927-06-22 1929-03-05 Electrical Res Products Improvements to television systems
FR743061A (en) * 1932-03-30 1933-03-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR652125A (en) * 1927-06-22 1929-03-05 Electrical Res Products Improvements to television systems
FR743061A (en) * 1932-03-30 1933-03-23

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