Goodbye to the plastic screen cover...
Miquelet
When I took it back and looked at the screen... I couldn't belive my eyes!
The plastic cover screen got badly scratched... by the pocket's button!
It looked awful, so I decided to go ahed and remove the cover once and
for all. It looks somewhat ugly now, but boy!, does the view improve!
So one question on my side... any good ideas on redecorating the area
now that the cover is gone?
And for those of you who are as careless (?) as me, beware of pocket
buttons!
Miquel
John King
any plastic to be?
Just to balance this out a little - remember why this was put there in the
first place. There was a large number of broken LCD displays and people were
bitching because of that.
Miquelet wrote in message <9SLK3.796$N64....@dfw-read.news.verio.net>...
Timothy Dixon
> Today I had the stupid (?) idea of putting my HP49G in my shirt pocket.
>When I took it back and looked at the screen... I couldn't belive my eyes!
>The plastic cover screen got badly scratched... by the pocket's button!
My opinion is that you didn't do anything stupid at all; your
calculator screen ought to have been able to handle that kind of
treatment without a second thought. ACO really ought to fix this.
Happy with my 48.....
John Miller
news:37fb9db5.6002260@midpoint...
> My opinion is that you didn't do anything stupid at all; your
> calculator screen ought to have been able to handle that kind of
> treatment without a second thought. ACO really ought to fix this.
>
subject to scratching. If it's glass, it's subject to breakage.
?????
Keith Farmer
> That would be nice, but what's your recommendation? If it's plastic, it's
> subject to scratching. If it's glass, it's subject to breakage.
Just keep the removable cover, and leave the screen recessed? The
shattered screens seem to be to be from impact/torsion. The first is
covered (as you will) by the removeable cover. I don't see a great
chance for breakage during active use -- just in luggage, backpacks, etc.
Miquelet
> subject to scratching. If it's glass, it's subject to breakage.
Well, this is a rather simplistic way to look at it. In my former
robotics company we would install car-lamp covers made of polycarbonate, not
glass. If exposure to chemicals is not critical, the use of polycarbonate
films is highly recommended due to their inherent resistance to scratches
(due to their relatively high hardness) and the availability of many
textured surfaces.
I am not sure what sort of plastic is the actual cover of the HP49G, I
am guessing it is made of much softer methyl methacrylate. Any polymer
expert here to help?
Miquel
John Miller
news:8KRK3.974$N64....@dfw-read.news.verio.net...
> I am not sure what sort of plastic is the actual cover of the HP49G, I
> am guessing it is made of much softer methyl methacrylate. Any polymer
> expert here to help?
Not me, but I had actually expected that the HP49 cover was polycarbonate.
Maybe an opportunity for improvement if it isn't . . . but as the owner of a
motorcycle with a polycarbonate windshield, I've gotta admit I'm not too
impressed with its scratch resistance. What are eyeglass lenses made of?
They're relatively robust.
Brad Ackerman
> What are eyeglass lenses made of? They're relatively robust.
And extremely expensive. A high-index plastic screen cover of the
type used in prescription eyeglasses would probably add at least $25
to the price of the calculator.
--
Brad Ackerman N1MNB "44% [of Americans] believe in strict Biblical
bs...@cornell.edu creationism. Four million also believe that
PGP: 0x62D6B223 they have been abducted by aliens."
http://skaro.pair.com/ -- _The Economist_, 4 Sep 1999
jcr...@aculink.net
screen cover on top of it. Use an exacto blade and cut around the edge
of the screen cover. Paste this down in the HP49. Press down on the
tape and the inside edge will show. Carefully cut along this edge, and
voila! You have a cheap, almost decorative black border to cover up all
those slots in your 49. - Good luck!
In article <9SLK3.796$N64....@dfw-read.news.verio.net>,
"Miquelet" <miq...@mit.edu> wrote:
> Today I had the stupid (?) idea of putting my HP49G in my shirt
pocket.
> When I took it back and looked at the screen... I couldn't belive my
eyes!
> The plastic cover screen got badly scratched... by the pocket's
button!
> It looked awful, so I decided to go ahed and remove the cover
once and
> for all. It looks somewhat ugly now, but boy!, does the view improve!
> So one question on my side... any good ideas on redecorating the
area
> now that the cover is gone?
> And for those of you who are as careless (?) as me, beware of
pocket
> buttons!
>
> Miquel
>
>
Sent via Deja.com http://www.deja.com/
Before you buy.
Stephen J Thomas
wrote:
>Miquelet <miq...@mit.edu> wrote in message
>news:8KRK3.974$N64....@dfw-read.news.verio.net...
>
>> I am not sure what sort of plastic is the actual cover of the HP49G, I
>> am guessing it is made of much softer methyl methacrylate. Any polymer
>> expert here to help?
>
>Not me, but I had actually expected that the HP49 cover was polycarbonate.
>Maybe an opportunity for improvement if it isn't . . . but as the owner of a
>motorcycle with a polycarbonate windshield, I've gotta admit I'm not too
>impressed with its scratch resistance. What are eyeglass lenses made of?
>They're relatively robust.
Some spectacle lenses are made of polycarbonate -- it has a higher
index of refraction than crown glass and CR-39 plastic allowing
thinner lenses. Polycarb is inherently softer than these other
materials -- which makes it more impact-resistant -- however they all
have a hardness/scratch-resistance coating [which is also UV
absorbant!] applied before leaving the factory -- at least in the USA.
As an aside, polycarb has fairly poor chromatic properties though
[that is, a low Abbe value], allowing more chromatic dispersion than
most other lens materials. On occasion, a patient will complain about
color fringing on high contrast materials -- such as black print on
white paper. However, I don't notice this in my lens powers at all.
I have no idea what kind of plastic the 49G screen cover is.
FWIW
S...@LikeEyeCare.com
SJTho...@aol.com
Miquelet
Actually, I have done something different in the meanwhile: I took a
nice (big!) .jpg picture of the HP49G and printed the screen area in full
colour on cardboard. I cut out the LCD screen itself, laminated the rest,
and glued it to my 49. Hey, it looks much better now! (from the distance it
even looks like the plastic screen cover is still there!)
Miguel
<jcr...@aculink.net> wrote in message news:7tgstd$out$1...@nnrp1.deja.com...
Carlos J. Martínez
not impossible.
Carlos
John Miller <j...@mindspring.com> wrote in message
John Miller
news:EmtL3.9209$eM4.6...@typ11.nn.bcandid.com...
> Use good quality plastic, appropriately specified for the desired task.
It's
> not impossible.
>
Diego Berge
wrote:
> Timothy Dixon <tdix...@spam.fwi.com> wrote in message
> news:37fb9db5.6002260@midpoint...
> > My opinion is that you didn't do anything stupid at all; your
> > calculator screen ought to have been able to handle that kind of
> > treatment without a second thought. ACO really ought to fix this.
> >
> That would be nice, but what's your recommendation? If it's plastic, it's
> subject to scratching. If it's glass, it's subject to breakage.
Nah, that's the very same thing they told me when I got my second
pair of specs, "plastic will get scratched, but glass breaks very
easily" -- I chose glass. My first pair got ruined in a bycicle
accident. I fell right on my face from a 1.7m landcut -- broken teeth,
nose, fisured jawbone, six days at the hospital, plastic surgery to
remove the scars... but those _glass_ specs didn't break, only got
scratched.
Kids, don't try my empirical science methods at home :)
Regards,
Diego Berge.
Metcalf & Metcalf
Stephen J Thomas <S...@LikeEyeCare.com> wrote in message
news:37fd212e...@news.mindspring.com...
> On Wed, 6 Oct 1999 20:47:19 -0400, "John Miller" <j...@mindspring.com>
> wrote:
> >Miquelet <miq...@mit.edu> wrote in message
> >news:8KRK3.974$N64....@dfw-read.news.verio.net...
> >> I am not sure what sort of plastic is the actual cover of the
HP49G, I
> >> am guessing it is made of much softer methyl methacrylate. Any polymer
> >> expert here to help?
> >
> I have no idea what kind of plastic the 49G screen cover is.
>
> SJTho...@aol.com
Dear All:
We use methyl methacrylate plastics a lot in dentistry--I 'm
not sure if the screen cover is this or not, but, if it *is*, then it
probably would be possible to polish it to a high shine with a plain, dry
chamois wheel at low-moderate speed on a lab lathe--I will give this a try
when I get back to the office next week. Of course, this doesn't *fix* the
problem.....can the scratch-resistant coating for eyeglass lenses be applied
to the screen cover ?
--
Roger D Metcalf
just a dentist
no cool quote to put here
metca...@aol.com
Arlington, Texas, USA
Joseph K. Horn
> Nah, that's the very same thing they told me when I got my second
> pair of specs, "plastic will get scratched, but glass breaks very
> easily" -- I chose glass. My first pair got ruined in a bycicle
> accident. I fell right on my face from a 1.7m landcut -- broken teeth,
> nose, fisured jawbone, six days at the hospital, plastic surgery to
> remove the scars... but those _glass_ specs didn't break, only got
> scratched.
Next time you go for a bike ride, please strap an HP49G to your forehead
instead of wearing a helmet, and let us know whether the display is
really as rugged as HP says it is.
-Joe-
Carlos J. Martínez
commercially available plastics as to recommend one, but a plastics engineer
should be able to do that without much trouble.
Carlos
John Miller <j...@mindspring.com> wrote in message
news:7tlsl4$4bt$1...@nntp8.atl.mindspring.net...