h a l f b a k e r y"It would work, if you can find alternatives to each of the steps involved in this process."
add, search, annotate, link, view, overview, recent, by name, random
news, help, about, links, report a problem
browse anonymously,
or get an account
and write.
register,
|
|
|
Please log in.
Before you can vote, you need to register.
Please log in or create an account.
|
There was an idea posted previously for instant
darkening lenses, wherein I posited (speaking entirely out
of my arse) that transition lenses darken pretty quickly. I
didn't actually own a pair, and was basing my claim solely
on a very misleading television advertisement. I
wholeheartedly apologize
for
that.
I now do own a pair, and now know exactly what
prompted the poster of that idea to get creative about
finding a solution. Even in full, direct sunlight, it can take
up to a full minute for these things to darken sufficiently
to be considered, by any reasonable measure,
sunglasses. Once inside, they take up to 10 minutes to go
clear again. I don't have a solution to the indoor clearing
delay, but I think I have one for the darkening delay issue.
My idea is for a hat with a UV lamp under the bill. It can
be a narrow, low profile pair of bulbs with a simple
switch. When you're about to go outside into the
sunshine, turn on the UV lamps a minute or so before
actually going outside to predarken them. A small solar
cell on the top of the hat can serve as a safety kill switch
to turn them off automatically once exposed to sunlight
to save you forgetting and accidentally giving yourself a
sunburn. A two minute timer switch might work as well.
Turning 3D shutter glasses into automatic sunglasses
http://hackaday.com...tomatic-sunglasses/
This looks like a fun experiment [xaviergisz, Jun 03 2014]
[link]
|
| |
Unless you're on the water and racing from the
dark hold to take the wheel before you run into a
sailboat that came at you out of the glare, the
darkening time is rarely critical. The do transition
quickly enough that by the time you actually have
to look at a glare you are fine.
|
|
| |
The reverse can, sometimes, be a problem, and I
have learned to take my glasses off and shield
them for a bit before entering certain locations
(mostly historic ones where they get annoyed if
you hold up the line and the floors tend to be
uneven). |
|
| |
MechE, it can be problematic when driving out of a
wooded area with lots of shade that has a curve
just outside the exit. |
|
| |
My auto-darkening welding hood activates in 1/100,000 of a
second or so (much faster than it takes the arc flair to go
the distance between the visor and my eye). Since mine is
a really really nice one, it has variable shade settings from
9 to 13 (sunglasses typically run from shades .75 to 1.5, but
I've seen some as dark as 2.5) and it has a sensitivity
adjustment that can be set high for low-light shop
conditions but turned down for outdoor work to prevent it
from being accidentally triggered by the sun.
|
|
| |
I've long wondered why this tech hasn't hit the sunglasses
market yet. I've seen plenty of rich idiots who spent more
on their shades than I did on my welding hood (about
$300). It seems like a no-brainer. |
|
| |
This idea came to me today again whilst driving, because
transitions, being UV activated, don't darken in a car because the
windshield has a UV filter. And yes, I do have a very nice (and
expensive) pair of prescription sunglasses. I had left them in my
other car by mistake when I set out for Wallace, ID and had to
make the westward drive home into the setting sun. It sucked. |
|
| |