Optical system for detecting focusing condition

Details Optical system for detecting focusing condition Optical system for detecting focusing condition

1989-02-23

1991-08-06

Sugarman, Scott J.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

359738, G02B 900

Patent

active

050371886

ABSTRACT:
An optical system for detecting focusing condition comprises a pair of image re-forming lenses and an aperture mask. The image re-forming lenses are configured with a pair of plano-convex lenses having equal radius of curvature R and an equal axial thickness T. R is nearly equal to T (R.apprxeq.T). The aperture mask has apertures corresponding to the respective plano-convex lenses and is attached closely to the flat surfaces of the plano-convex lenses. Comatic aberrations for the respective light fluxes passing through the apertures become nearly same, and therefore point images formed by the respective light fluxes also become nearly same. Consequently, high accuracy of focusing condition detection is established.

REFERENCES:
patent: 3548041 (1970-12-01), Stading
patent: 4526458 (1985-07-01), Kawamura et al.
patent: 4699493 (1987-10-01), Koyama et al.
patent: 4808806 (1989-02-01), Shindo et al.
T. Karasaki, "AF Sensor Module", Minolta Techno Report, pp. 40-42 (1986).

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