Polarization conversion unit, polarization conversion device, and projector
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A polarization conversion unit includes a polarization splitting element array including a plurality of polarization splitting films for splitting the incident light beam into two types of linearly-polarized light beams, a plurality of reflecting films for reflecting either one of the linearly-polarized light beams obtained by the polarization splitting films, and a 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.
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Citations
8 Claims
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1. A polarization conversion device, comprising:
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a polarization conversion unit, comprising; a polarization splitting element array including a 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, and a 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, and the second fixing frame fixes the retardation plates to the polarization splitting element array via an elastic member. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A polarization conversion unit, comprising:
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a polarization splitting element array including a 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, and a 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, wherein a size G of a gap between the polarization splitting element array and the retardation plates is in a range of 0.01≦
G≦
0.3mm.
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Specification