What is the smallest CRT that people here know of?

J

John

Guest
My Sony CCD TR55e camcorder which I got as a faulty item
won't play tapes but does have a working viewfinder ....

Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?

Also how to get the whole viewfinder apart. It had one screw in the barrel
which is now not there but the barrel still holds together fast. Mind you I am
suspect I may have to get the rest of the housing off to access the viewfinder
so that's another issue.

Anyone with info here if you can help?
 
Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?
Click to expand...
I would very much doubt it's a CRT.
Probably a B&W LCD with a variable focus lens for those who need to wear
specs.

Good luck with the fixing, though. If you do have to rip it apart to get to
the screen, might as well have a crack at fixing the mechanism (if you can
be bothered)

-mark
 
"mark jb"
Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?

I would very much doubt it's a CRT.
Click to expand...


** I think it very much is a tiny CRT.

There is one on my old Sony.



......... Phil
 
"Trevor Wilson"
"mark jb"

I would very much doubt it's a CRT.

**You'd be wrong. CRTs were very common in old video cameras. In fact,
they were prized above early LCDs, since they provided far better deatil,
albeit in monchrome.
Click to expand...

** I just opened up the viewfinder part of my old Sony CCD300AU and had a
peek.

Amazing.

A tiny CRT, about 56mm long, with a 5/6 pin plug on the base and a set of
deflection coils around the neck covered in a ( tin plate ?) metal shield.

The phosphor screen is about 18 mm diameter, masked down to about 9 mm by 12
mm actual viewing area ( 14mm diagonal).

The B&W image is sharp as a pin.




......... Phil
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:3vmon9F16u4uqU1@individual.net...
"Trevor Wilson"
"mark jb"

I would very much doubt it's a CRT.

**You'd be wrong. CRTs were very common in old video cameras. In fact,
they were prized above early LCDs, since they provided far better deatil,
albeit in monchrome.


** I just opened up the viewfinder part of my old Sony CCD300AU and had a
peek.

Amazing.

A tiny CRT, about 56mm long, with a 5/6 pin plug on the base and a set of
deflection coils around the neck covered in a ( tin plate ?) metal shield.
Click to expand...
**It may even be mu-metal. You never know your luck.

The phosphor screen is about 18 mm diameter, masked down to about 9 mm by
12 mm actual viewing area ( 14mm diagonal).

The B&W image is sharp as a pin.
Click to expand...
**Yep. MUCH better resolution than the first generation LCD viewfinders. In
fact, probably better resolution than the best current generation LCDs as
well.


--
Trevor Wilson
www.rageaudio.com.au
 
"bodgy"

Toshiba have an experimental 20" flat panel screen that has individual
CRT's for each pixel - still in R&D at the moment, though they've
shown it at one of the European Expos -- they hope it to be the
successor to Plasma - cheaper and less juice and better picture
contrast.


** So each ''CRT " is about 0.3mm diameter ???

Obviously there is no deflection system and no internal grid or anode
structure so the title " CRT " is just a TAD misleading.

But if high speed electrons are striking a phosphor to make light
...............




........ Phil
 
Phil Allison wrote:
"bodgy"

Toshiba have an experimental 20" flat panel screen that has individual
CRT's for each pixel - still in R&D at the moment, though they've
shown it at one of the European Expos -- they hope it to be the
successor to Plasma - cheaper and less juice and better picture
contrast.


** So each ''CRT " is about 0.3mm diameter ???

Obviously there is no deflection system and no internal grid or anode
structure so the title " CRT " is just a TAD misleading.

But if high speed electrons are striking a phosphor to make light
..............




....... Phil





sounds like a plasma to me........similar system...
Click to expand...
 
On Wed, 07 Dec 2005 00:04:20 +1030, John
<sittinginthepool@internode.on.net> put finger to keyboard and
composed:

My Sony CCD TR55e camcorder which I got as a faulty item
won't play tapes but does have a working viewfinder ....

Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?
Click to expand...
I once had to replace a faulty flyback transformer in a National VHS
camcorder viewfinder. It had a monochrome CRT.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.
 
Matt said

:: sounds like a plasma to me........similar system..

Phil said

:: But if high speed electrons are striking a phosphor to make light


Well yes, I was on my way to bed when I typed that.

Toshiba & Canon using Surface-conduction Electron-emitter Display
technology (SED) hope to have by 2007 50" displays of 1920*1080
contrast ratio of 100,000:1 at a rate of 75,000/month ---- I'm quoting
from their blurb here, so some hypebole is to be expected.

The technology is similar to Plasma, but without using noble gasses.

The HT is supplied between two glass plates, with the low voltage
electron emitter being in a 10nanometre slit that on one side has the
phosphor.

A better description and nice drawings are at

http://www.canon.com/technology/display/ and here for links to
white papers.

http://searchwin2000.techtarget.com/sDefinition/0,,sid1_gci797765,00.h
tml

Off to bed now!

Colin
 
Ummm... I had the idea that plasma occurs in a gas, not in a hard
vacuum. I'm sure that Phil can elaborate on the details.

Bob

On Thu, 08 Dec 2005 06:58:59 +1000, matt2-amstereo
<amstereoAToptusnetDOTcomDOTa@u> wrote:
sounds like a plasma to me........similar system...
Click to expand...
 
How big is the FBT for a CRT that size?


"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:khifp19073lovhcp81pr9qodj1t0t2gg52@4ax.com...
On Wed, 07 Dec 2005 00:04:20 +1030, John
sittinginthepool@internode.on.net> put finger to keyboard and
composed:

My Sony CCD TR55e camcorder which I got as a faulty item
won't play tapes but does have a working viewfinder ....

Looking through this unit it looks like a black and white CRT picture
but if you take the eyepiece off there is a small square white screen
about 1x1 cm across. Anyone know if this is indeed a CRT and if
so how small can you make the little buggers?

I once had to replace a faulty flyback transformer in a National VHS
camcorder viewfinder. It had a monochrome CRT.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.
Click to expand...
 
"Bob Parker" <bobp.deletethis@bluebottle.com> wrote in message
news:rn1gp19jh0tqjgj9gfpjt0vqb7fcuue6k5@4ax.com...
Ummm... I had the idea that plasma occurs in a gas, not in a hard
vacuum.
A plasma is an ionised gas. Kinda hard to ionise a vacuum.
Click to expand...

Cheers
Alf
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top