Talk:Iconoscope

Date of invention
There was a major error in the article. Although Vladimir Zworykin invented an electronic television tube in 1923, it was not an iconoscope, which is what he dubbed his 1931 tube. The difference was that his 1923 tube used a two-sided plate, with the lens focusing the image on photoelectric mosaic the front side of the plate, and the electronic beam sweeping the back side of the plate. The 1931 iconoscope used a single-sided target, with the electronic beam scanning the same side covered with the photoelectric surface. — Walloon (talk) 22:58, 14 March 2008 (UTC)


 * These issues have been addressed, so perhaps the above may deleted. However, the article lacks adequate citations for some critical content. I'm going to insert some "fact tags". Cheers, Rico402 (talk) 06:34, 31 July 2009 (UTC)

Earliest patents of Iconoscope VS Earliest patents of I.Dissector
It would be important to mention.

Mr. Farnsworth’s Dissector tube has no relationship with the iconoscope. It can easily be established when looking at the drawings of Mr. Farnsworth’s patent no. 1,773.980 that his camera is not housed in a so-called Braun tube: it does not have a cathode ray beam which would sweep across a photoraster and it does not have storage, among many other essential features! — Preceding unsigned comment added by 84.2.22.21 (talk) 19:34, 22 September 2011 (UTC)

Figure Error
The figure called 'Diagram of Iconoscope' has a serious error. There is no voltage (E field) between the signal plate and the collecting ring, because they are shown shorted together. This is inconsistent with Zworkin's patent figure above where battery 23 biases the plate (or ring) in front of the photoelectric material positive as it must to attract the photoelectrons. This positive bias of the anode collecting ring is also shown in an Iconoscope figure credited to Encyclopedia Britannica 2002.

The Diagram of Iconoscope figure could be fixed up with the following changes: Delete the line segment from ground to the line segment pointing to +1000V. Then reconnect (switch) the ground and +1000V line segment so that the +1000V line segment is connected to the collector ring, and the 'signal output' is across a resistor connected to ground. ('Second anode' is meaningless here and should also be removed.)
 * Don Fulton — Preceding unsigned comment added by 50.189.234.7 (talk) 04:09, 7 February 2016 (UTC)

External links modified
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Confusing passage
"When exposed to light, the photosensitive coating releases electrons which are supplied by the charge stored in the silver"

I find this passage difficult to understand.

I assume "releases electrons" means into the interior of the tube? This is what it says a few paragraphs down.

But then what is the silver plate supplying? It is electrically insulated from the granules, so I am not clear how it can supply anything.

And if the front of the plate has a negative charge from the scanning, wouldn't the silver plate be positively charged? So then how would it supply electrons, which is what the wording implies?

Maury Markowitz (talk) 12:12, 18 May 2022 (UTC)

Invention of First Fully Electronic Television
In the first paragraph it is stated that Zworykin and his iconoscope was the first 'all electronic television', which is grossly incorrect. Philo Taylor Farnsworth, a Utah, High school student, and farm boy, holds the United States patents on 'all electronic television'. Radio Corporation of America (RCA) was forced through numerous well documented court battles to pay Farnsworth royalties for infringing on the Farnsworth television patents. Farnsworth however developed, and used a different electronic camera tube known as an 'image dissector'. This said, Zworykins' development and contribution of the iconoscope tube was a great performance improvement on the Farnsworths image dissector. Ira (talk) 0216 hours PDT, October 23rd 2022 CMI1949 (talk) 09:18, 23 October 2022 (UTC)