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Abstract

An ophthalmic illumination filter selection mechanism for use with an ophthalmic illumination system. Three filters are mounted in holders on a first shaft and rotatable into an optical light path determined by the ophthalmic illumination system. Each of three cams mounted on a second shaft is configured to move a holder on the first shaft to position the corresponding filter in the optical light path in a predefined sequence relative to the other filters as the second shaft is rotated in a forward direction. Each cam has a backlash that allows the second shaft to be rotated in a reverse direction for a predetermined radial distance to allow a last remaining filter to be removed from the optical light path. Each cam has a cam profile that ensures one filter remains in the optical light path until the next filter is driven into the optical light path when the second shaft is rotated in the forward direction. This mechanism occupies less space than conventional filter selection mechanisms.

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First Claim