DISTANCE METER Russian patent published in 1997 - IPC

FIELD: optical instruments, in particular, video, TV, photo and cinema cameras. SUBSTANCE: device has two lenses 1, 2. Focal plane of one lens contains light source 3. In addition device has generator 4, which is connected to light source 3, photodetector 5, adder 6, differential amplifier 7, first and second band-pass filters 8, 9, first and second synchronous detectors 10, 11, photodetector movement drive 12, photodetector position detector 13, divider 14, indicator 15. In addition photodetector 5 has two members. Shot lens 18 is focused in automatic and half- automatic modes by distance meter which has focusing unit which consists of shot lens 18 with its drive 21 and position detector 20 which has comparator 19 and manual drive 17. EFFECT: increased precision of distance measurement, increased precision of focusing. 11 cl, 1 dwg