Automatic focusing device probe comprising a focusing device and

Details Automatic focusing device probe comprising a focusing device and Automatic focusing device probe comprising a focusing device and

1978-02-16

1979-07-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350 9626, G01V 120

Patent

active

041631480

ABSTRACT:
An automatic focusing device is disclosed which focuses an object onto an image plane. The device comprises an optical correlator which includes: a first focusing member, an optical fiber means, a grating structure and photoelectric receiving means. The device further comprises control means, motor means, and means for adjusting the first focusing means.
A probe is disclosed which comprises an elongated tubular member; a first focusing means; an optical fiber bundle; a grating structure; photoelectric receiving means; means for focusing light received from the grating structure; and display means for electrically displaying the position of the probe.
Also, a method of determining optimum focus position of a probe is disclosed which comprises passing the light image of an object through a bundle of optical fibers in the probe to form an image of the object. Light leaving the bundle is directed onto a grating having a grating constant such that the spatial frequency spectra of the fibers and of the grating do not overlap. The optical correlation between the object image and the structure are then determined and the probe is adjusted based upon electrical signals derived from the optical correlation.

REFERENCES:
patent: 3953729 (1976-04-01), Hosoe et al.
patent: 4070116 (1978-01-01), Frosch et al.

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