×

Polarization conversion unit, polarization conversion device, and projector

  • US 7,922,331 B2
  • Filed: 06/06/2008
  • Issued: 04/12/2011
  • Est. Priority Date: 07/11/2007
  • Status: Expired due to Fees
First Claim
Patent Images

1. A polarization conversion device, comprising:

  • a polarization conversion unit, comprising;

    a polarization splitting element array includinga plurality of polarization splitting films disposed obliquely to an incident light beam and for splitting the incident light beam into two types of linearly-polarized light beams,a plurality of reflecting films disposed in parallel alternately between the polarization splitting films and for reflecting either one of the linearly-polarized light beams obtained by the polarization splitting films, anda translucent member provided with the polarization splitting films and the reflecting films;

    a plurality of retardation plates each formed of a quartz crystal member and for converting a polarization axis of either one of the linearly-polarized light beams obtained by the polarization splitting films into a polarization axis of the other of the linearly-polarized light beams; and

    a spacer member having a predetermined thickness and for bonding end sections of the retardation plates to a light beam exit side of the translucent member; and

    a fixing frame for fixing the polarization conversion unit, wherein the fixing frame includes a first fixing frame disposed on a light beam entrance side of the polarization splitting element array, and a second fixing frame disposed on a light beam exit side of the retardation plates,the first fixing frame has a fixing section for fixing the polarization splitting element array, andthe second fixing frame fixes the retardation plates to the polarization splitting element array via an elastic member.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×