Optical apparatus having a luminous flux shaping filter

Details Optical apparatus having a luminous flux shaping filter Optical apparatus having a luminous flux shaping filter

1996-08-30

1999-01-12

Epps, Georgia Yvonne

Optical: systems and elements

Lens

Single component with multiple elements

359719, 359738, 369 4423, G02B 900, G02B 302, G11B 700

Patent

active

058597301

ABSTRACT:
An optical apparatus including a luminous flux shaping filter for converting a shape of an incident beam without bending an optical path of the incident beam. A light beam emitted from a focusing laser source comprising a semiconductor laser is converted into a parallel light beam by a collimator lens, and then enters the luminous flux shaping filter. The luminous flux shaping filter is positioned on an optical path in the apparatus in the manner that a major axis of an oval light beam from the collimator lens is perpendicular to a longitudinal area in which the transmittance is the highest in the filter. As a result, the luminous flux shaping filter converts the oval light beam into a substantially circular light beam without bending an optical path of the light beam.

REFERENCES:
patent: 4240090 (1980-12-01), Hughes et al.
patent: 4341473 (1982-07-01), Mast
patent: 5159491 (1992-10-01), Richards
patent: 5499262 (1996-03-01), Nakata
patent: 5629808 (1997-05-01), Powell

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