h a l f b a k e r y
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Projection clocks (e.g. which shine
image of a clock onto your bedroom
ceiling) are very
idea for a clock which uses a laser
pointer to draw out a clock face and
hands. It will have the nice clean,
crisp lines of laser projection
and be configurable -
choose a digital display if you like
with a range of
(In theory this
could be hooked up to your PC to
project any vector graphics format.
This would be better than the
alternative of using one of those
screen projection systems to project
a configurable clockface - (1) Laser
pointers are low power and so don't
need fans, (2) For just a clock, a
single colour is enough).
Laser clock pen
[thumbwax, Oct 05 2004, last modified Oct 21 2004]
It's a great idea hippo, this guy already built one.
[ato_de, Oct 05 2004, last modified Oct 21 2004]
Home Built Laser Projector
Build your own galvanometers. [Ouroborus, Jun 01 2006]
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||I want a Dali-esque fried egg one. +
||[thumbwax]'s link has confused me. Does this operate as that does? What I was imagining was a laser using a similar concept as a tv, tracing the time on the wall....
||I too am confused by [thumbwax]'s
link - I can't believe it does what it
seems to say it
Breathtakingly halfbaked -
especially the picture of his
working prototype. It reminds me
of a Baird TV system.
||Just to pick nits, the system shown in [ato_de]'s link is a raster-rendered image, not a vector-rendered one. For most people that means little to nothing, but I assure you there are some applications where vector imaging is much better suited than raster imaging (not that a household projection clock would be one of those).
As for the projection-clock- in-a-pen, I think its manufacturer must be using some slick technology to create the display. It's probably a direct laser projection through a small LCD and lens system. For an analog clock face, a trio of diffraction gratings (one for each hand, plus one for static markings) rotated by stepper motors could produce the desired effect.