OPTICAL BEAM-SPLITTER UNIT AND BINOCULAR DISPLAY DEVICE CONTAINING SUCH A UNIT

摘要

The invention relates to an optical beam-splitter unit which contains crosse d transparent planoparallel plates (6, 7), starting at a common intersection line (4) with light reflecting surfaces that diverge towards the light beam to be split. The binocular picture display device that is also subject of the invention contains an optical beam-splitter unit and it has first focusing elements (24) and mirrors in front of the eyes (25). This device is characterised by that its beam-splitter unit is the above described one, the first focusing elements (24) are placed at two opposite sides as seen from t he direction of the beam arriving to the semitransparent reflective surfaces of the optical beam-splitter unit (22) i.e. from the receiving direction (5) an d the common optical axis (23) of the first focusing elements (24) is at right angles to the receiving direction; outside the first focusing elements (24) on both sides a mirror is placed in front of each eye, and the semitransparent reflective surfaces of these mirrors enclose an angle .delta. 45~ .plusmn. 1 5~ with the above mentioned optical axis (23), and the intersection line of the se reflective surfaces is parallel to the mirror crossing intersection line (4) of the semitransparent reflective surfaces.