| 摘要 |
An overhead projector is provided, including a main body portion 10 including a light source, a head portion 20 which projects an image of a material put on the main body portion 10 onto a screen S, and a support portion 30 which supports the head portion 20 so that the head portion 20 ascends or descends over the main body portion 10. The head portion 20 includes a head main body 21, which is supported by the support portion 30, a rotating holder 22, which is installed such as to rotate about the head main body 21, a first dove prism P1, which is installed in the head main body 21, a second dove prism P2, which is installed un the rotating holder 22 such as to have the same optical axis as the optical axis of the first dove prism P1, a lens 23, which is installed on the bottom of the rotating holder 22 and guides light projected by the main body portion 10 to the second dove prism P2, and a reflection mirror 24, which is installed on the head main body 21 and reflects light transmitted by the first dove prism P1 toward the screen S.
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