1989年Okada領導的日本研究團隊提出了圓錐型複合全像術，將二維的物體資訊以細條長型的方式記錄於全像底片上，因此在重建影像時會有一條一條的垂直條紋重疊於影像上，我們稱為「柵欄效應」。而實驗室學長姐提出的成像面圓錐型複合全像術，在拍攝時的物光系統和參光系統中加入圓柱透鏡，改進全像片彎折成圓錐曲面時所產生的「像散效應」（astigmatic effect），增加單張全像片可觀賞影像的範圍，以雙眼觀賞時，重建出形變量較小的三維立體影像。 本論文的重點在於，我們在拍攝成像面圓錐型複合全像術時，不在物光與參考光系統中加入圓柱透鏡，而是直接將物體資訊面彎折，透過成像系統，將物體資訊直接成像至圓錐曲面上進行拍攝。全像片拍攝完成後不需要彎折成圓錐曲面，因此繞射光在正確觀賞位置時會有收斂點且不會產生像散效應。我們以電腦模擬全像片拍攝的過程和觀賞者雙眼觀看到的方塊影像，並探討在不同觀賞位置觀看全像片時方塊影像的變化情形。最後，為了增加觀賞的垂直視角，在參光系統中加入了柱狀透鏡和擴散片。 我們透過彎折物體資訊面，成功地製作出沒有像散效應的成像面圓錐型複合全像術，並擴展了觀賞時的垂直視角，最後也提出了未來發展的方向。 Abstract The conical holographic sterogram was developed in 1989 by Japanese research team led by K. Okada. They recorded 2D image information belonging to different angles of the original object in a sequence of long, thin and fan-shaped areas of the recording film. Therefore, the reconstructed image will have many black stripes. It looks like viewing an image through a fence, called the “picket-fence effect”. This problem can be amended by using the image-plane technique. Before study, they add cylindrical lenses in both the object beam and the reference beam to compensate for the “astigmatic effect”, produced when hologram is curved into a conical surface. This time in the study, the effect of bending the object information plane concerns us. Using the way of image-plane of conical holographic sterogram, we reshape the object information plane into a conical one without cylindrical lenses in both of the object and reference beam. After this kind of altering in the object plane, the image can lay on the conical surface snugly. Therefore, we simplify the step in the experiment about bending the film into a conical plane and the diffracted ray will be converged into points at the viewing window without astigmatic effect. The observer can perceive the 3D virtue images generated inside the hologram cone during reconstruction. We use numerical calculation to simulate the holographic process and the reconstructed 3D images observed at different positions. In order to increase the dimension of the vertical viewing window, we add cylindrical lenses and diffuser in the reference beam. Using this fabrication method, we successfully record the reflection of the image-plane conical multiplex hologram and reconstruct the 3D images without the astigmatic effect. Finally, we will propose some improved methods and possibility in the future development.
