Projection optics and projectors

JP7877917B2Active Publication Date: 2026-06-23SEIKO EPSON CORP
View PDF 8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SEIKO EPSON CORP
Filing Date
2022-07-25
Publication Date
2026-06-23

Smart Images

  • Figure 0007877917000001
    Figure 0007877917000001
  • Figure 0007877917000002
    Figure 0007877917000002
  • Figure 0007877917000003
    Figure 0007877917000003
Patent Text Reader

Abstract

To provide a projection optical device and projector that can suppress a shift of image light of a projected image caused by heat.SOLUTION: A projection optical device comprises an optical system that image light enters, a reflector element that reflects the image light emitted from the optical system, and a housing that houses the optical system and the reflector element. The reflector element includes a base material having a first surface on which light is incident and a second surface opposite from the first surface, a reflection layer provided at the first surface of the base material, and a heat conductive layer provided at the second surface of the base material. The heat conductive layer has heat conductivity higher than that of the base material.SELECTED DRAWING: Figure 2
Need to check novelty before this filing date? Find Prior Art

Claims

1. The optical system into which the image light is incident, A reflective element that reflects the image light emitted from the optical system, The system comprises the optical system and a housing that accommodates the reflective element, The aforementioned reflecting element is A substrate having a first surface to which the image light is incident and a second surface opposite to the first surface, A reflective layer having a concave shape is provided on the first surface of the substrate, The substrate has a thermal conductive layer provided integrally with the substrate on the second surface of the substrate, which has a higher thermal conductivity than the substrate. The illuminance distribution formed on the reflective layer by the image light includes a first region where the illuminance is higher than a predetermined value. The second surface includes a second region corresponding to the first region, The heat conductive layer is provided over an area of ​​80% or more of the second surface, including the second region. A projection optical device characterized by the following features.

2. The housing has a sealed structure that seals the housing space containing the optical system and the reflective element. The projection optical device according to feature 1.

3. The aforementioned substrate is made of plastic material. The projection optical device according to claim 1 or 2.

4. The reflective layer and the heat conductive layer are made of a metallic material. The thickness of the heat conductive layer is greater than the thickness of the reflective layer. The projection optical device according to claim 1 or 2.

5. The surface roughness of the heat conductive layer is greater than that of the reflective layer. The projection optical device according to claim 1 or 2.

6. The image light emitted from the reduced conjugate plane is incident on the optical system. The reflective element projects the reflected image light onto the magnified conjugate surface. The projection optical device according to claim 1 or 2.

7. A light source device that emits light, A light modulator that modulates the light from the aforementioned light source device, The projection optical device comprises the projection optical device according to claim 1 or 2, which projects image light modulated by the optical modulation device, A projector characterized by the following features.