PHABLABS 4.0 Gobo Batman/Slide projector Title of the workshop: The Gobo Batman/Slide projector Target audience: 14 /16? Time planning: Part 1 (15 min), part 2 (15 min), part 3 (5 min). Estimated cost: 9.06
Step 1 Title: Gobo workshop The working of optical system based on lenses is explained during this workshop. Two lenses are used to make a slide projector. The first lens is to make the divergent light coming from the led into parallel light (collimation). This done to make sure the slide gets enough light evenly distributed over the slide. Figure 1 shows the lens system that is used in the Gobo slide projector. Figure 1: Optical system of the Gobo slide projector As you can see in Figure 2 the first lens should be place with the flat side towards the LED to make the divergent light parallel. The second lens should be placed with the flat side towards the slide to make the enlargement of the image possible. Figure 2: Ray of light going thought a plano-convex lens (left); Picture of the lee and the holders used in the project (right)
Step 2: Part list Listed below are the parts that are used to make the Gobo projector. In figure 5 the electrical and photonic components are displayed. Construct the electronical and photonic components first before you begin with the construction of the Gobo projector. Photonics parts For the optical part, we will only use a spherical plano-convex lens with the following specifications. Name Diameter Effective diameter Focal length Dioptre Form Lens 34.5 mm 30.0 mm + 225 mm +4.4 Spherical Figure 3: Picture of the spherical lens in use Electronic parts: We would need a bright source of light, an electronic control, a switch and a battery: 11 volts LED DC-to-DC converter (3 to 30V) USB cable Electric cables USB power bank
Figure 4: Electric components needed (USB power bank, DC-DC converter and LED) Other parts: To make the collimator and the frame, we will need: PVC tube wooden plates. Step 3: Building some blocks Collimator A collimator is needed to collimate the light that is coming from the LED. In Figure 3 there are two rings displayed; take some glue and attach these two circles to each other. Take the PVC tube and place aluminium tape of the inside of the tube, with the help of a pencil. Take the PVC tube and a hammer to take the tube inside of the circle. a b c d Figure 5: a, b, c, d
LED First ensemble the electronical and electrical parts before you start with the Construction of the Gobo projector. Take the DC-to-DC converter and solid the red wire to Vin+ and a black wire on Vin-,do this also the Vout+ and Vout-.. Solid the red wire to the plus of the LED and the black to the minus of the LED when you have ensemble the DC-to-DC converter.
Step 3: Assembly of the Gobo Step 0: The Gobo projector is divided into three parts and will be construct in three parts. The figure below shows the final product with each part indicated. Figure 6: the 3 different parts to make the Gobo Step 1: print the Gobo projector with the laser printer and lay them out as shown in picture 1. The construction of the Gobo projector is guided by a code. This code can be found on each component, Figure 7 show the available codes. The projector is divided in three sections.
Figure 7: the coding system used during the Construction of the Gobo projector. A) shows the pentagram code, b) shows the circle code and c show the triangle. Step 2: The first part of the Gobo projector will be constructed out of the circle components. Sort out all the component with the circle and put them together, as shown in figure 8.
Figure 8: overview of the part for the First part of construction. Step 3: In Figure 10 you can see the four plates, take three plates two without print and one with print. Place the plates as shown in figure 11a and 11b. Place the final plate to make an open box as shown in figure 5 Place the lens on the top of the box the finish the first part of the Gobo projector. If all the steps are followed correctly the first of the Gobo looks like
Figure 9 : The Construction of the First part, a) top view, b) side view Figure 10: the First part with the top part attached (left) the finished part (right) Part 2
Step 4: The first part of the Gobo projector is finished, to start with the second part sort out all the components with a triangle engraved on them. The small components on the left top side are going to be used to hold a slide. Figure 11: the part needed for the second part step 5: Take the two plates with the holes in them and the small components to hold the slide. Place them as shown in the Figure 15. Take the only Blanco plate and place it as shown in Figure 16 and Figure 17.
a b c Figure 12: The slide holder system (a), first plate attached to the slide holder system (b) and second slide holder attached to the previous plates (c)
Step 6: Take the handle that you have constructed before and place the handle as shown in Figure 18. Take the first lens and place it in front of the slide holders with the flat side towards the lens. Take the final plate with the ruler engraved and insert it on the only place that is left. Figure 18 shows the last step to finish the last part. Figure 13: the lens is place in the second part of the Gobo construction Step 6: The last part of the Gobo projector is the handle. Take the remaining parts and place them as shown in Figure 19. Figure 14: Steps for the construction of the Gobo handle
End product Congratulation you have now a final Gobo projector that allow you to use your grand-pa slide or make your own design to project your sign as Batman does Figure 15: Final Gobo Projector
PHABLABS 4.0 is a European project where two major trends are combined into one powerful and ambitious innovation pathway for digitization of European industry: On the one hand the growing awareness of photonics as an important innovation driver and a key enabling technology towards a better society, and on the other hand the exploding network of vibrant Fab Labs where next-generation practical skills-based learning using KETs is core but where photonics is currently lacking. www.phablabs.eu This workshop was set up by the Department of Imaging Physics at TU Delft in close collaboration with Science Centre Delft.