Automatic focusing system using focal length-changing element

Details Automatic focusing system using focal length-changing element Automatic focusing system using focal length-changing element

1992-08-18

1993-10-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502017, G01J 120

Patent

active

052548457

ABSTRACT:
In an automatic focusing system an element (2) is inserted in the path of a beam of light (3) directed towards a sensor array. The element comprises a transparent material or predetermined reflective index, the element presenting a first region (4) of a first thickness and another region (5) of a greater thickness. The image falling on to the sensor comprises three areas--one area where the light has passed through the one region and another area where the light has passed through the further region and yet another area. The automatic focusing system derives signals from two of the areas and processes the signals so that the image is in focus in the third area.

REFERENCES:
patent: 4415246 (1983-11-01), Karasaki et al.
patent: 4548495 (1985-10-01), Suzuki

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