Focus detection device for a camera
Focus detection unit and microscope using the focus detection un
Focus driving apparatus with impact resistance
Focus error detecting apparatus
Focus error detecting element and optical head using the same
Focus mechanism for varifocal lens
Focus module and method for manufacturing same
Focus servo actuator for moving lens scanners
Focus stabilizing apparatus
Focus stabilizing apparatus
Focus stabilizing mechanism for microscopes and similar...
Focus-adjusting unit and microscope
Focus-error detection using prism-enhanced spot size monitoring
Focus-position compensator
Focus-position compensator
Focusable front projection lens systems for use with large scree
Focusable virtual image display
Focusable, color corrected, high performance projection lens sys
Focused illumination, reduced light leakage floodlit center high
Focuser for optical instrument