| 摘要 |
The head mount type display device includes an optical system having a light emitting element, a display element illuminated by the light emitting element, and an image forming element 20 for producing an image. The display element is arranged between the image forming element and the first focal point of the image forming element at a position nearer to the first focal point of the image forming element. A virtual image of the display element is formed by the image forming element 20 and the light emitted by the light emitting element is focussed on a second focal point of the image forming element. It is designed such that the eye of an observer is located on the second focal point when use. In another form, the optical system includes first and second elliptical concave mirrors with respective ones of focal points arranged at a common position.
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