Abstract: The invention relates to a screen for projectors which comprises a screen base in which at least two kinds of colorants selected from a colorant having an absorption wavelength region in 400 nm to 440 nm, a colorant having an absorption wavelength region in 470 nm to 510 nm, and a colorant having an absorption wavelength region in 570 nm to 610 nm are carried on the whole image display area of the screen base. Also disclosed are processes for producing the screen and projectors having the screen.

Abstract: A drill guide for use in securing a spinal fixation plate to a spine is provided. In a preferred embodiment, the drill guide generally includes a support member having first and second arms mated thereto. Each arm includes a proximal end and a distal end having at least one barrel coupled thereto and defining a lumen for receiving a tool. One or both arms can be slidably movable along the support member to allow the distance between the arms to be adjusted. In use, the arms can be adjusted to engage a spinal fixation plate and to position the barrels on each arm in alignment with bores formed in the fixation plate. The drill guide can then be used to drill, awl, tap, and insert implants, such as spinal screws, into the vertebral bodies to attach the fixation plate thereto.