Dual-magnification rear projection lectern
Exposure method and apparatus
Feed screw device
Focusing lens holding mechanism used in optical system
Focusing system for a transparency projector
Illumination system for use in image projection apparatus
Illumination system for use in image projection apparatus
Image display apparatus
Image forming apparatus
Image projecting unit
Image projection apparatus with a autofocusing system
Image projection system
Image projection system with auto-focus
Image projection system with autofocusing
Image projector apparatus having automatic focus control system
Image reading apparatus
Lamp and lens retrofit assembly for overhead projector
Laser beam focusing arrangement and method
Lens cover set
Lens focusing means for slide projectors