Monochromatic image forming optical system and monochromatic fil

Details Monochromatic image forming optical system and monochromatic fil Monochromatic image forming optical system and monochromatic fil

1998-12-28

2000-10-17

Sugarman, Scott J.

Optical: systems and elements

Lens

Selective wavelength transmitting or blocking

359738, 359784, G02B 1300, G02B 900, G02B 912

Patent

active

061340545

ABSTRACT:
A monochromatic image observing optical system is provided with an objective lens, a negative lens group, a monochromatic filter and a positive lens group that are arranged in this order from an object side. The monochromatic filter is a narrow bandpass interference filter. The objective lens and the negative lens constitute an afocal system on the image side, and the positive lens has a power that counterbalances the power of the negative lens group. The monochromatic filter is arranged between the negative and positive lens groups.

REFERENCES:
patent: 4687926 (1987-08-01), Plummer

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