How to make the projector with your hands?

Today there are a huge variety of accessories for video playback: televisions, smartphones, home theater, etc. But to organize the broadcast for how a wider audience, alas not as simple as a home theater projector or costs a lot of money and afford such a pleasure can far everyone. Therefore, we will look at the theoretical aspects and a few techniques that will allow you to make the projector by hand.

Theory

Transfer of images from any carrier on a vertical surface is based on the laws of optics. At interaction with various carriers luminous flux is refracted beams changes in the spectrum with subsequent display on the screen.

Homemade projector can be realized in different ways. In practice there are several image transmission technologies that are implemented in various filmoskop, sliders and projectors. The most popular designs are:

• Slide projector - based on the passage of the luminous flux through the transparent medium. The figure below shows a diagram of such a device,

  

wherein the light source 2, the flow sent to the reflector 1 to a slide 4 which is in the focusing lens 3. Modified spectrum extends to an optical amplifier 6 and transmitted to the screen 7.

• epi - work by reflecting the light flux from the opaque objects.

  

Illustrated above is the principle of action of a reflection type projector in which light source 1 transmits stream reflecting mirror 2 and incident on the image 3. The modified light beam travels through the lens to the reflector, which transmits the image on the screen.

• projectors - transmitting video information from the slide moving the film when passing through them the light flux.
• DLP projectors - broadcast video information by reflecting the luminous flux from a special chip. The flow itself in them formed the color logic array. Such devices delivers high picture clarity and color accuracy.

  

• LCD projectors - implementing transmission image by passing light through the transparent LCD panel. Unlike DLP technology, LCD projectors provide the output bright vivid and vibrant colors.

Today, digital multimedia projectors can easily compete on quality of photos and video with the best HD TVs. Therefore, home projectors can be used as a personal movie theater for family viewing movies, or as a means of demonstrating visual materials at conferences and lectures. Alas, to recreate the digital multimedia device with your hands is almost impossible, since it is necessary to synchronize the mechanical, optical and digital elements. But to realize the classic projector using digital equipment under the force of each.

On the basis of the smartphone

Mobile phones are not only used for communication at a distance, but also for video communication. That is why there was the idea of ​​making the projector from a handheld gadget. Theoretically imaging process consists in converting a graphic signal display through the optical lens on any surface. To do this you need to build it, completely obscuring the surrounding area, anchorages, as lenses, and the mobile device.

Quite simply pick up a magnifying glass or a magnifying glass. The main thing is that his size parameters were commensurate with the size of the phone screen. To fix the magnifier, you can use the front wall of the housing. For vertical fastening phone can use a cardboard box of cardboard or ribs in which the mobile phone will not wobble. The housing is most easily done from the cardboard box, since it is easy to cut a hole right parameters without special equipment.

To work you will come in handy tape, glue, stationery knife, pencil, ruler and compass.

The manufacturing process of the projector of the smartphone is as follows:

• Select one of the walls of the box so that the distance from it to the opposite was the largest. This will provide a wider range of options to customize the display.
• Mark the wall at the selected middle, around which the cut a hole under a magnifying glass.

  

• Secure the magnifying glass on the wall of the box. This can be used as an adhesive tape, and a good adhesive, it is important that they do not fall into the lumen of the lens, otherwise it may spoil the image from the projector.

  

• Make a holder for a mobile phone, it is important that when you install it does not cover the display and placed inside the box.

  

• Empirically to adjust the image select the most optimal distance from the mobile to the magnifying glass.

  

• Make a hole for charging cord from the mobile to take it out of the box.

The projector of the smartphone is ready, you can start the event, but pre-install a special app that will turn the image by 180 °. In some phones disable the screen auto-rotation is sufficient to install the gadget and upside down. Viewing better organized in a well-darkened room to improve the clarity and brightness of the picture.

In addition of the mobile phone and polymer plates can be produced holographic projector (Fig. 8). But the cost of such home-made will result in a considerable penny at a relatively low image quality, so to compete with the above model it can except in unique features pictures.

Based tablet or laptop

This projector has a higher image quality due to a larger screen. There are the more "humane" methods of implementation, in which digital devices remain intact, and the methods for which you want to extract a graphic template for the broadcast images.

To make the projector from a laptop you will need a cardboard box large enough that its end face is commensurate with the monitor, and the length is not less than 50cm. A magnifying glass should have a fairly large size, well cope with the task of Fresnel lenses are also important to use the lens of the device for a full-reading books. To raise the projector, you will need to do the following:

• Cut on the end surface of the box opening for magnifying glass.

  

Its size makes a little less than the lens so that it can be fixed on the edges.

• By means of tape, adhesive tape or silicone sealant lock the lens in the bore.

  

It is important to achieve a snug fit glass to the cardboard to prevent the penetration of light into the projector from the outside.

• In the wall opposite the hole to make the computer screen.

  

When installing the last edge of the board should go overlap, so that the light, again, did not penetrate inside the projector.

• Turn the notebook upside down so that the keyboard is on the cover of the box. According to the principle of the optical lens pictures coup.

  

The simplest projector from a laptop ready, just turn it into a wall socket, and you can enjoy the broadcast of a favorite movie. The same principle can be used for the assembly of the plate on the projector.

The projector of the device for viewing slides

projector Making of a ready unit greatly simplifies the task as any adjustments in terms of optical effects you produce is not required. These settings are made in the factory and the device for viewing slides perfectly demonstrates the graphical objects from paper or other media A4. Your only task - to choose the most suitable translator photo video. In this example, we will look at the production of the projector from the working plate of the monitor, which is suitable in size diascopy.

To do this you need to perform these steps:

• Disconnect the matrix of gadget is perfect for a tablet that you are no longer in use.

  

When disassembling matrices extreme caution not to damage the fragile element.

• Together with the LCD panel and remove the electronic board of the tablet, because through it will be used to connect to a PC for data transfer.
• Place the matrix on the glass with a gap between them of about 5mm.

  

The distance required for ventilation, since powerful flow will condition the light and excessive heating of the surface.

• Set opposite the gap fan, in this case a cooler.

  

Thanks to its low weight it is attached with double-sided adhesive tape construction.

The projector is ready - enough to connect two devices in the network and run by computer the desired video. In this projector, you get a high enough quality image, which is usually only slightly dependent on the distance from the screen. It should be noted that the market can find a smaller device for the slide show, which will be commensurate with the smartphone's screen.

Ways to improve the quality of images

To increase the sharpness of the image of a self-made projector must perform these simple steps:

• Set to monitor the maximum brightness and contrast - it will increase the quality of the transmission image.
• Remove any cracks and gaps in the projector housing, through which light can penetrate once.
• Paint the inner walls of the homemade projector in black. If possible, it is better to paste over her black velvet cloth to minimize the reflection of light off the walls.

  

In addition to the quality of the projector translation is influenced by external factors. So that the image is well perceived, windows should hang curtains in the daytime, and at night just turned off all sources of illumination. Note, the smaller the distance to the screen, the higher the quality of the image thereon. It is also important, and the screen itself - is preferable to have a smooth color surface, tranquil colors.

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