Optical system for a large depth-of-field bar code scanner

Details Optical system for a large depth-of-field bar code scanner Optical system for a large depth-of-field bar code scanner

1988-09-21

1990-12-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502081, 235462, G06K 710

Patent

active

049788604

ABSTRACT:
An optical system for a bar code scanner has a working range that is not determined by the lens aperture, but by the dimension and orientation of the detector. In the preferred embodiment, the desired working range is imaged onto a detector array using a modified Scheimpflug arrangement. The array in the first Scheimpflug plane with respect to the lens defines a second Scheimpflug plane that intersects the bar code tag to be read. So long as the bar code tag intersects the image of the detector array in the second Scheimpflug plane, a portion of the image of the bar code tag will be in focus on at least one of the elements of the detector array. The lens aperture can be as large as desired to maximize resolution and minimize illumination needs without adversely affecting the working range. The scanner's bar code illumination can be directed along the second Scheimpflug plane, which is off the optical axis of the lens. With separate illumination and detection paths, the optical system of the invention does not require beam splitters or mirror/aperture arrangements needed by the conventional systems.

REFERENCES:
patent: 3876841 (1975-04-01), Kramer et al.
patent: 4408120 (1983-10-01), Hara et al.
patent: 4501493 (1985-02-01), Kubota
patent: 4560862 (1985-12-01), Eastman et al.
patent: 4612437 (1986-09-01), Ohsato
patent: 4678288 (1987-07-01), Lonsdale et al.
patent: 4682016 (1987-07-01), Inoue
patent: 4818886 (1989-04-01), Drucker
patent: 4831275 (1989-05-01), Drucker

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