| 发明名称 |
PROJECTION OPTICAL SYSTEM AND PROJECTOR APPARATUS |
| 摘要 |
A projection optical system comprises an image forming unit that forms an image; a refractive optical system including a plurality of lenses that enlarges and projects the image on a screen; and a reflecting surface, wherein an intermediate image is formed between the refractive optical system and the reflecting surface, and the projection optical system satisfies conditions of “0.6<D/Did<0.8” and “2.5<Did/F<6”, where “Did” represents a maximum paraxial image height of the intermediate image in a focusing state in which a projection image is maximum, “D” represents a maximum value of a distance between an optical axis and an intersection of a paraxial image surface and a light beam passing center of an aperture stop of the refractive optical system, and “F” represents a focal length of the refractive optical system in a focusing state in which the projection image is maximum. |
| 申请公布号 |
US2014268073(A1) |
申请公布日期 |
2014.09.18 |
| 申请号 |
US201414203646 |
申请日期 |
2014.03.11 |
| 申请人 |
Takano Yohei |
发明人 |
Takano Yohei |
| 分类号 |
G02B13/00;G02B17/08 |
主分类号 |
G02B13/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A projection optical system comprising in this order:
an image forming unit that forms an image; a refractive optical system including a plurality of lenses that enlarges and projects the image on a screen; and a reflecting surface, wherein an intermediate image is formed between the refractive optical system and the reflecting surface, and the projection optical system satisfies conditions of “0.6<D/Did<0.8” and “2.5<Did/F<6”, where “Did” represents a maximum paraxial image height of the intermediate image in a focusing state in which a projection image is maximum, “D” represents a maximum value of a distance between an optical axis and an intersection of a paraxial image surface and a light beam passing center of an aperture stop of the refractive optical system, and “F” represents a focal length of the refractive optical system in a focusing state in which the projection image is maximum. |
| 地址 |
Kanagawa JP |
