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Tri-color separating optical system

  • US 4,933,751 A
  • Filed: 09/08/1988
  • Issued: 06/12/1990
  • Est. Priority Date: 09/09/1987
  • Status: Expired due to Fees
First Claim
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1. A tri-color separating optical system for separating an optical image of a subject into three different color optical images, which comprises:

  • (a) focusing means for focusing the subject optical image on a first optical image forming plane (Ig);

    (b) dichroic reflecting means, optically coupled to said focusing means, for directly passing a first color optical image therethrough and reflecting a second color optical image in a first direction therefrom, and a third color optical image in a second direction opposite to the first direction therefrom;

    (c) first optical block means having therein a first total reflection surface optically coupled to said dichroic reflecting means and causing a first extended optical path length, for reflecting the second color optical image reflected from said dichroic reflecting means in the first direction to a second optical image forming plane (Ib) through the first extended optical path length; and

    (d) second optical block means having therein a second total reflection surface optionally coupled to said dichroic reflecting means and causing a second extended optical path length, for reflecting the third color optical image reflected from said dichroic reflecting means in the second direction to a third optical image forming plane (Ir) through the second extended optical path length;

    the first, second and third different-color optical image forming planes (Ig, Ib, Ir) being aligned with each other in close vicinity on a single plane.

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