| abstract |
Provided is an imaging apparatus having a compact image input optical system that employs a projection system in which an image in the center of a screen is enlarged and does not require a complicated configuration such as a variable power optical system or an ultra wide angle lens. An image pickup device converts an optical image into an electric signal, and an image input optical system that forms an optical image on a light receiving surface of the image pickup device. The image input optical system has a projection characteristic represented by the following formula: y ′ = a · f · sin (b · θ), and satisfies the conditional expression: 0.18 <f / TL <2. Here, 0 <a <sin θmax, b = π / (2 · θmax), f: paraxial focal length of the whole system, θ: half angle of view (diagonal angle of view in radians), θmax: maximum half angle of view (Diagonal angle of view in radians), y ': actual image height on the light receiving surface of the image sensor, TL: on the optical axis from the vertex of the most object side surface of the image input optical system to the light receiving surface of the image sensor Is the distance. [Selection diagram] FIG. |