| 摘要 |
PURPOSE: A virtual image observation optical device is provided to reduce noise in image data caused by stray light by setting an angle formed by respective surface normal vectors at a point where a luminous flux division element and a reflection element are crossed within a specified angle range while making a side where a light beam is reflected on the respective surfaces of the respective elements in the positive direction of vector. CONSTITUTION: A light source optical system is equipped with a 1st half mirror(21) being the luminous flux division element for deflecting light from a light source device for illumination(10) and guiding it to a reflection type spatial optical modulation element(20), and the reflection element(23) for guiding the light from a 2nd half mirror(22) being the luminous flux division element for deflecting the light from the light source optical system to the pupil(131) in observation space(130). An angle formed by the 1st half mirror(21) and the reflection type spatial light modulator(20) is set to 45 degree and the angle; formed by the surface normal vector drawn to the 2nd half mirror(22) and the surface normal vector drawn to the reflection element(23) is set to range 136-179 degree. Thus, the noise in the image data caused by the stray light is reduced.
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