Autofocus module having a diffractively achromatized toroidal le

Details Autofocus module having a diffractively achromatized toroidal le Autofocus module having a diffractively achromatized toroidal le

1996-11-18

1997-12-30

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502018, 356 406, 396 80, G01J 120

Patent

active

057033510

ABSTRACT:
An autofocus module generates a beam of light that is divergent in the horizontal direction and collimated in the vertical direction. The beam is formed using a laser diode and a diffractively achromatized toroidal lens. A pair of receiver lenses which have focal lengths that are longer and shorter than the distance to a photodetector plane are positioned to receive the beam reflecting from an object. A pair of photodetectors, positioned at the photodetector plane, each providing an output signal that is indicative of the amount of light received by a associated receiving lens. The difference in the output signals is a function of the distance of the object from the detector plane and may be used to drive a camera lens to a desired focus position or to provide an indication of the object from the module.

REFERENCES:
patent: 4496832 (1985-01-01), Sakai et al.
patent: 5006700 (1991-04-01), Kosaka et al.
patent: 5471046 (1995-11-01), Meyers
patent: 5569904 (1996-10-01), Meyers

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