Multifocal scanning system

Details Multifocal scanning system Multifocal scanning system

1990-11-26

1992-01-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

235467, G06K 500

Patent

active

050813641

ABSTRACT:
A bar code scanning system having a focusing lens for focusing scanning light beams in a first focal plane includes a slide member supporting a transparent substrate which enables the focusing lens to focus the light beams in a first focal plane through which a coded indicia is moved. When a coded indicia is moved closer to the focusing lens, the intensity of the reflected light beams increases which is detected by a detector member whose output signals operate a drive member coupled to the slide member, moving the slide member to a position removing the substrate from the path of light beams enabling the focusing lens to focus the light beams in a second focal plane which is closer to the focusing lens than the first focal plane.

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