Projector having light combiner structure for reduction of EMI noise
A projector includes a first light modulator configured to emit first image light beam, a second light modulator configured to emit second image light beam, a prism configured to combine the first image light beam and the second image light beam with each other, a first metal member configured to couple the first light modulator and the prism to each other, a lens configured to project light beam combined by the prism, a second metal member configured to support the lens, and a third metal member configured to couple the prism and the second metal member to each other. An air layer is disposed in a facing area where the first metal member and the prism face each other.
1 . A projector comprising:
a first light modulator configured to emit first image light beam;
a second light modulator configured to emit second image light beam;
a prism configured to combine the first image light beam and the second image light beam with each other;
a first metal member configured to couple the first light modulator and the prism to each other and the first metal member has an opening through which the first light beam passes;
a lens configured to project light beam combined by the prism;
a second metal member configured to support the lens;
a third metal member configured to couple the prism and the second metal member to each other;
an adhesive layer configured to bond the first metal member and prism to each other disposed in a facing area where the first metal member and the prism face each other; wherein
the facing area has a frame shape surrounding the opening when viewed along a facing direction in which the first metal member and prism face each other; and
an air layer disposed in the facing area, wherein the adhesive layer and the air layer are disposed adjacent to each other in a direction along a circumferential edge of the opening, wherein the adhesive layer and air layer each include multiple regions arranged alongside each other, and wherein a proportion of the adhesive layer to the air layer between the prism and first metal member is in a range of 73% to 90%.
2 . The projector according to claim 1 , wherein
a recessed part is provided to at least one of the first metal member and the prism which face each other via the air layer.
3 . The projector according to claim 1 , wherein the air layer comprises a permittivity of about 1.0 [F·m −1 ].
4 . The projector according to claim 1 , wherein a permittivity of the prism is in a range of about 3.7 [F·m −1 ] to about 10.0 [F·m −1 ].
5 . The projector according to claim 1 , wherein a permittivity of the prism is in a range of about 8.0 [F·m −1 ] to about 10.0 [F·m −1 ].
6 . The projector according to claim 1 , wherein a permittivity of the adhesive layer is about 5.0 [F·m −1 ].
7 . The projector according to claim 1 , wherein a thickness of the adhesive layer is about 1 mm.