psone LCD using CRT lens

Status
Not open for further replies.
Jump to Latest
R

rmpmla

Member
Joined 2004
#1
my first to post in diyaudio and thank you for all the infos here in this forum.
been doin lots of adjustment with my box and will share the result as i progress.
here is the image on the LCD
 

Attachments

  • image on lcd.jpg
    image on lcd.jpg
    35.8 KB · Views: 1,723
#3
parts use:
70 watt MH with enclosure and aluminum reflector.
Redant PSone screen
fresnel and condenser lens from a leisegang OHP
NEC crt projection lens from surplusshed
here is the result
 

Attachments

  • bedsheet.jpg
    bedsheet.jpg
    38.7 KB · Views: 1,510
#5
In my test I had the same where there was a brighter circle in the centre. You'll find that this can be rectified by moving the Lamp away from the fresnel a bit more. Sometime try'll and error gives better results than the actual maths. Let me know if I'm correct.🙂
 
#7
Gizmotech, you are right🙂 but it took me quite a while to figure this out as i was concentrating on improving the reflector of the lamp.
the lamp came in with complete fixture, so i used the aluminum reflector that came with it.
the reflector is just a plain aluminum and i eventually replaced it with mirror finished.
 
#8
was not able to take picture of the PJ using the aluminum reflectors.
the attached picture is one of those test set ups. this set up produced dim image.

i also, posted this result with hertz web🙂
 

Attachments

  • pj guts.jpg
    pj guts.jpg
    40.2 KB · Views: 1,569
#9
i changed my reflector to soup ladle after i found out that reflected light is the one covering the four corners of the screen and the bright circular light directly from the lamp. am i right?
anyways, this is the result with soup ladle reflector. condenser to LCD distance is around 13.5" and lamp engine
 

Attachments

  • improve image.jpg
    improve image.jpg
    18.5 KB · Views: 1,272
#11
aad1972 said:
In your last photo, is that just me or are you getting some vignetting around the corners of the screen? Is that from having the lens resting so close to the screen? Good job though!🙂
Click to expand...

thanks add1972. yes, the corners are not lighted up but this is due to off centered fresnel relative to the LCD. please,correct me if i'm wrong on this because i just based this on my actual test/adjustment.
the reason for off centered fresnel is due to eagerness of cutting it into size.
the CRT projection lens has a very short focal of around 6". i tried moving it outward but image became blurred.
 
#12
here,s another screenshot.
A VGA hack was needed for the Redant PSone LCD since it does not have a composite input.
i do the monitor swap to switch to 640 X 480 interlaced. personally, i would not advise this as it may mess up your PC, unless it is a dedicated one.
 

Attachments

  • picture.jpg
    picture.jpg
    20.2 KB · Views: 815
#13
attached is the modified box for the last two screen shots i posted.
i added a mirror between lamp and fresnel to to increase distance with minimal extension of the first box. beside the CRT projection lens is the H-sync/V-sync mix to VGA adapter.
 

Attachments

  • box.jpg
    box.jpg
    57.8 KB · Views: 885
#18
joker35 said:
your projector is verry good with crt lens.
but crt lens is verry big
Click to expand...
thanks joker35, you might say that it is big. i got an NEC and a Fujinon, the diameter of the lens averages to about 4 1/2". including the housing the diameter would be around 5". so this can still be installed on box with height of around 6".
the dimension of the box on my initial post is around 12"X11"X6"
 
Status
Not open for further replies.
Top Bottom