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The history of CCD and CMOS image sensors.
jonpaul:
CCD and CCD imaging was an American invention!
George Smith and Willard Boyle, invented the CCD at Bell Telephone l Laboratories NJ, 1969 —
Awarded the 2009 Nobel Prize in Physics,
CCD was developed for imaging by Michael F. Tompsett, at Bell Labs, in the 1970s.
https://www.bell-labs.com/about/history/innovation-stories/charge-coupled-device/
Jon
tooki:
--- Quote from: tooki on March 25, 2023, 01:36:00 pm ---(Writing this before watching)
Oh boy, Asianometry… let’s see what he gets wrong this time! (While that guy’s enthusiasm and productivity is great, the quality of his research is often lacking. I don’t think I’ve seen a single video of his that didn’t have some glaring error or an omission of something that would have disproven his claim.)
--- End quote ---
So…
- confused photoelectric and photovoltaic effects
- confounded CCD memory and bubble memory
- mixed up camera shutter and iris
- claimed the CCD’s power consumption was why early camcorders had short battery runtime
NiHaoMike:
--- Quote from: tooki on March 25, 2023, 02:19:16 pm ---- claimed the CCD’s power consumption was why early camcorders had short battery runtime
--- End quote ---
Back when camcorders used tubes, I'm sure the first CCD camcorder would be marketed as having very good battery life.
tooki:
--- Quote from: NiHaoMike on March 26, 2023, 03:34:24 pm ---
--- Quote from: tooki on March 25, 2023, 02:19:16 pm ---- claimed the CCD’s power consumption was why early camcorders had short battery runtime
--- End quote ---
Back when camcorders used tubes, I'm sure the first CCD camcorder would be marketed as having very good battery life.
--- End quote ---
Probably. But I kinda suspect that all the other stuff involved in an early camcorder — a CRT viewfinder, a tape transport, etc. — and the limitations of pre-lithium rechargeable batteries would probably end up being the deciding factor, not the sensor type!
mawyatt:
We used CCDs for Sine & Cosine Convolvers as part of the Chirped Z Transform based portable handheld Real Time SA developed back ~80. Back then we had a custom CCD process, and these custom CCDs had very large clock capacitances (recall 4 clocks, 2 had large C and 2 had moderate C). These clocks needed to swing >15VPP at a high rate which would produce a very large chip clock driver power dissipation and might be why the early CCD imaging chip based cameras consumed high power (during readout).
Anyway, we developed a clocking scheme called "Reactive Clocking" which exchanged the capacitive clock energy stored in the chip clock capacitance with the power supply, similar to a boost regulator, which saved ~95% of the power of a conventional clock driver (we should have patented this but didn't, and ~ decade later NASA did, altho for a different application!!). Without the Reactive Clock our handheld SA would require a couple deep discharge DieHard Lead Acid Truck batteries :P
Best,
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