发明名称 |
Head-up display |
摘要 |
A head-up display includes a projector which projects an image light and a hologram lens which diffracts and reflects the projected image and form a virtual image located ahead of a windshield. The hologram lens has a vertical diffraction characteristic which is equivalent to a hyperbolic or parabolic-curve mirror along a line formed by the intersection of the hologram lens and a vertical plane which includes an axis of the image light and a horizontal diffraction characteristic which is equivalent to a parabolic or elliptic curve mirror along a line which is formed by the intersection of the hologram lens and a horizontal plane which includes the axis of the image light. When the hologram is directly attached on a curved windshield which has a focal length fs (in case it is a mirror), the focal length fo of the hologram and the former focal length fs has the following relationship; 1/fo=1/fh+1/fs, where fh is a focal point when the hologram is flat.
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申请公布号 |
US5710646(A) |
申请公布日期 |
1998.01.20 |
申请号 |
US19950438734 |
申请日期 |
1995.05.10 |
申请人 |
NIPPONDENSO CO., LTD. |
发明人 |
KIMURA, TEIYUU;ANDO, HIROSHI;SUGIURA, MINAKO;KUROKAWA, KAZUMASA;BAN, SUZUO |
分类号 |
B60K35/00;G02B27/00;G02B27/01;(IPC1-7):G03H1/00;G02B5/32;G02B27/14 |
主分类号 |
B60K35/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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