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A project log for open-hardware transparent polygon scanner

laser scanner which uses transparent instead of reflective polygon

HexastormHexastorm 07/12/2019 at 18:310 Comments

In my previous post, I outlined how transparent polygon scanner can be used for detecting eye diseases.

Logically, a transparent polygon scanner can also be used in 3D glasses.  Reflective polygon scanners are used for creating a screen in a laser TV. It is harder to use scanning mirrors in fibers because the reflected light has a different angle than the incident light. By scanning prisms the transmitted light does have the same angle as the incident light.

A lot of companies are active in 3D glasses; e.g. Google Glass, Magic Leap, Oculus and Hololens.

Colors are created in a laser TV by  coupling three lasers of different wavelength and optical power in the same bundle. At 50000 RPM and six sides the line rate is in the order of 5000 Hz. If you project a 1000 lines with a 1000 pixels the refresh rate would be 5 Hz at 1 megapixel.

Let's look into multiple options of  improving this;
Option 1:  Optical transformation
Project a 1000 lines with 4000 pixels and transform it into 2000 lines at 2000 pixels using optical transformations provided by a combination of lenses, mirrors or surface waves.
Option 2:  Miniaturization
Scale down the size of the prism, using possibly transparent conductors (e.g. indium tin oxide ITO). Place the prism in a fluid to reduce the influence of vibrations or into a gas for a low drag. Due to the down scaling it will be much easier to balance and spin the prism. The angular momentum drops due to lower mass and radius, which implies lower energies at a fixed RPM. The fastest spinning disk ever made at 600 million RPM is also small.
The following options are foreseen;
1. Laser Light emitted from a fiber which is collimated by a lens. The light is then focused by a cylinder lens parallel to the prism rotation plane. The light is subsequently focused by a cylinder lens orthogonal to the rotation plane. The line is converted into a plane by moving the light in a second direction via a piezo-actuated tube actuator. A photo-diode in the image plane detects the start of a scan line.
2. Laser Light emitted from a fiber which is directly focused by a lens. The laser light is refracted through a rotating transparent prism. This creates a line. This light is then refracted again through a rotating transparent prism or a tilt-able prism. This creates a plane. In the plane there is a photo-diode which detects the start of the line for each line.

I claim that in the configurations the rotation of the prism is monitored by monitoring an auxiliary laser bundle with a photodiode that refracts through the rotating or titl-able prism.
I claim that that lenses are are added after the laser bundle is focused onto a 2D plane to transform it so it is more suitable for the eye.
I also claim the use of a plurality of transparent polygon fiber scanning displays to create one image.

Get hold of a Magic leap Glass and replace Magic Leap core technology; the fiber scanning display, see patent US10260864B2 with the Transparent Polygon Fiber Scanning Display (TPFSD).  Couple in the light to the eye via WaveOptics as provided by companies like Enhanded World.
Possibly, the TPFSD must be placed on a static underground as the rotation is affected by vibrations.

Notes:
I claim the trade mark on Hexa Glass for virtual reality glasses which use a rotating prism to move laser bundles.

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