| 摘要 |
PURPOSE:To absorb the radiant ray from a high luminance cathode ray tube glass face, in an optical path bending type projection lens, by a simple constitution, by forming a base material of a reflection mirror in the projection lens, by a radiant ray shielding member. CONSTITUTION:A projection lens 13 for bending and projecting a picture of a cathode ray tube is constituted of lenses 7a-7c, a lens barrel 8, and a reflection mirror 14 whose base material is a radiant ray shielding member. The reflection mirror 14 uses a radiant ray shielding glass as a base material 15, and a metal such as aluminum or silver, etc. is vapor-deposited to said base material, by which a layer 16 is formed. Accordingly, a radiant ray from a cathode ray tube glass face, whose light emission by a high luminance is required is absorbed in the projection lens 13, and therefore, it is unnecessary to provide separately the radiant ray shielding member, and it is possible to make the titled lens light and to reduce its cost. |
