scanning laser video monitor without MEMS
50 frames of real-time pictures per second can be performed on any screen by a laser diode. Beam is modulated with TV video signal and scanned with mirrors. Horizontal scanning freq. 15625Hz; Vertical scanning freq. 50Hz. Colour video is possible with RGB laser. Dimensions of the picture increases with distance and limited only by the capacity of the laser source.
In this project, by means of two mirrors (which can be rotated about two perpendicular axis electromagnetically without MEMS) we deflect the laser beam so as to scan a rectangular screen, and we show that this scanning technique can be used for emitting and receiving light and any kind of radiation.
Main part of our scanning system consists of two mirrors: one for horizontal scanning and the other one for vertical scanning: Mirror X oscillates about the x-x axis with an angular frequency ωx and Mirror Y oscillates about the y-y axis with an angular frequency ωy. Planes of mirrors and the screen are all parallel to each other.
If we keep the Mirror Y stationary and rotate Mirror X slightly (angle α), deflection of the beam on the screen will be Δx. And similarly if we keep the mirror X stationary and rotate the Mirror Y slightly (angle β), we will get a vertical deflection Δy on the screen.
The source is modulated to print any picture on any screen (even a motion picture). To accomplish this we begin with the composite video signal of TV and seperate the vertical and horizontal snychronization pulses. We use vertical sync. to drive vertical oscillator; horizontal sync. to drive horizontal oscillator and the video part to modulate the laser. In our scanner horizontal sync.(line sync.) frequency is 15625 Hz and vertical sync. (frame sync.) frequency is 50 Hz. Rectangular frames of dimensions 10x7cm can be projected on a screen 20cm away from the source.(100mW laser will be enough for a picture of dimensions 100x100 cm) As can be seen in our video (taken by an amateur camera) linearity of picture is satisfactory.
Adventages of scanning laser techique:
- Low power consumption
- Pictures can be performed on any screen.
- Dimensions of the picture increase with increasing distance
- No lenses are needed for focusing
- Color video is possible with RGB laser
- Can be used as a projector and in many other fields such as: Fast laser printers which can print on any paper (by burning the paper) at the frame rate; i.e., 50 pages per second. Fast CD, DVD data recorders (and readers) which can record data on a stationary plate.
And many other industrial, medical, scientific... applications of scanning laser.
Besides these laser monitoring applications, this scanning technique can also be used for receiving light or any kind of radiation. In order to do this laser source should be replaced with a photomultiplier or some other kind of radiation sensor. As the mirrors oscillates and scans the space, incoming rays from the related portion of the space will reach to the receiving unit and will be detected. We belive that this kind of real time and real space receiving technique will have many advantages over conventional methods.
We may also suggest that this scanning tecnique can be used for three dimensional applications.
Our video can be watched: http://www.youtube.com/watch?v=vFhGqDLrRHA
Problem this idea/invention addresses:
This unique multipurpose laser scanning technique has many advantages over the conventional projection methods: LCD projectors and MEMS based devices.
Attached files:Scanning Laserresimsiz son.doc Asking price:
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