JP2004004964A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2004004964A5 JP2004004964A5 JP2003289591A JP2003289591A JP2004004964A5 JP 2004004964 A5 JP2004004964 A5 JP 2004004964A5 JP 2003289591 A JP2003289591 A JP 2003289591A JP 2003289591 A JP2003289591 A JP 2003289591A JP 2004004964 A5 JP2004004964 A5 JP 2004004964A5
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- refractive power
- projection
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Description
このため、本発明においては、スクリーン側から順番に負の屈折力の第1のレンズ群、正の屈折力の第2のレンズ群、負の屈折力の第3のレンズ群および正の屈折力の第4のレンズ群の組み合わせ、または、第1のレンズ群、第2のレンズ群、第3のレンズ群、第4のレンズ群および正の屈折力の第5のレンズ群の組み合わせを有し、入射側がテレセントリックである投影レンズであって、第1のレンズ群は非球面レンズの一枚構成であり、第2のレンズ群は正レンズの一枚構成である投影レンズを提供する。負−正−負−正の4つのレンズ群によって構成されることで、レトロフォーカス型の組合せになるので長いバックフォーカスが確保でき、入射側をテレセントリックにしやすく、特に、液晶ライトバルブと組み合わせやすい投影レンズを提供できる。また、第4のレンズ群をスクリーン側の前群と、入射側の後群とに分けて、正の屈折力の第4のレンズ群と、正の屈折力の第5のレンズ群とを備えた構成にすることも可能である。さらに、最もスクリーン側の第1のレンズ群に非球面レンズを用いる。レンズの口径が大きくなり、スクリーン側に最も近く結像性能に影響を与える第1のレンズ群に非球面レンズを用いることにより、第1のレンズ群を一枚構成にすることが可能となる。さらに、第1のレンズ群に続く、第2のレンズ群も一枚構成にすることにより、より少ない構成枚数で、性能のよい投影レンズを提供することができる。 Therefore, in the present invention, the first lens group of negative refractive power, the second lens group of positive refractive power, the third lens group of negative refractive power, and the positive refractive power in order from the screen side Or a combination of a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group of positive refractive power. The present invention provides a projection lens in which the incident side is a telecentric projection lens, the first lens group is a single lens configuration of an aspheric lens, and the second lens group is a positive lens configuration. By being composed of four negative-positive-negative-positive lens groups, it becomes a retrofocus type combination, so a long back focus can be secured, it is easy to make the incident side telecentric, and in particular, projection that is easy to combine with a liquid crystal light valve Can provide a lens. The fourth lens group is divided into a front group on the screen side and a rear group on the incident side, and the fourth lens group is provided with a fourth lens group of positive refractive power and a fifth lens group of positive refractive power. It is also possible to use a different configuration. Furthermore, an aspheric lens is used for the first lens group closest to the screen. The use of an aspheric lens for the first lens group that increases the aperture of the lens and affects the imaging performance closest to the screen side makes it possible to make the first lens group into a single lens configuration. Furthermore, by making the second lens group following the first lens group also one piece, it is possible to provide a high-performance projection lens with a smaller number of components.
第1のレンズ群は負のメニスカスレンズの一枚構成とし、第2のレンズ群は凸レンズの一枚構成とすることができる。 The first lens group may be configured as a single negative meniscus lens, and the second lens group may be configured as a single convex lens.
Claims (4)
前記第1のレンズ群は非球面レンズの一枚構成であり、前記第2のレンズ群は正レンズの一枚構成である投影レンズ。 Combination of the first lens group of negative refractive power, the second lens group of positive refractive power, the third lens group of negative refractive power, and the fourth lens group of positive refractive power in order from the screen side Or a combination of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group of positive refractive power, and the incident side is telecentric And the projection lens
The first lens group is a single-lens configuration of an aspheric lens, and the second lens group is a single-lens configuration of a positive lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003289591A JP2004004964A (en) | 2003-08-08 | 2003-08-08 | Projection lens and projector device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003289591A JP2004004964A (en) | 2003-08-08 | 2003-08-08 | Projection lens and projector device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10035836A Division JPH11231218A (en) | 1998-02-18 | 1998-02-18 | Zoom lens for projection and projector device |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004004964A JP2004004964A (en) | 2004-01-08 |
JP2004004964A5 true JP2004004964A5 (en) | 2005-05-26 |
Family
ID=30438824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003289591A Pending JP2004004964A (en) | 2003-08-08 | 2003-08-08 | Projection lens and projector device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2004004964A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4594008B2 (en) * | 2004-09-08 | 2010-12-08 | キヤノン株式会社 | Zoom optical system |
JP4612824B2 (en) * | 2004-09-17 | 2011-01-12 | キヤノン株式会社 | Image projection device |
JP4372815B2 (en) | 2007-08-30 | 2009-11-25 | 三菱電機株式会社 | Image projection device |
JP5101959B2 (en) * | 2007-09-13 | 2012-12-19 | 富士フイルム株式会社 | Projection type zoom lens and projection type display device |
JP6376809B2 (en) * | 2014-04-03 | 2018-08-22 | キヤノン株式会社 | Projection device and imaging device used in three-dimensional shape measurement system |
CN105527698B (en) * | 2016-01-26 | 2018-11-02 | 深圳市谛源光科有限公司 | A kind of projection lens of DLP miniature projector |
-
2003
- 2003-08-08 JP JP2003289591A patent/JP2004004964A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI485464B (en) | Imaging optical lens assembly | |
JP6181019B2 (en) | Optical system and optical apparatus | |
JP2009527002A5 (en) | ||
TWI781947B (en) | Optical lens | |
EP1884815A3 (en) | Fixed-focal objective of the retrofocus type for projector | |
WO2009041382A1 (en) | Wide-angle optical system, imaging lens device, monitor camera, and digital apparatus | |
JP2004522187A5 (en) | ||
JP2017040849A5 (en) | ||
ATE547731T1 (en) | IMAGING LENS AND IMAGE RECORDING DEVICE | |
JP2007286233A5 (en) | ||
TW200736657A (en) | Imaging apparatus and zoom lens | |
EP1571479A3 (en) | Retrofocus type projection optical system | |
TW200612188A (en) | Imaging lens and imaging apparatus | |
CN206074892U (en) | Focus lens in a kind of long-focus | |
JP2019008148A5 (en) | ||
JP2005208236A5 (en) | ||
JP2013120392A (en) | Zoom lens | |
JP2007033555A5 (en) | ||
TWI263074B (en) | Zoom lens | |
JP6570477B2 (en) | Imaging optical system, projection display device, and imaging device | |
JP2006163338A (en) | Zoom lens | |
JP2007304268A5 (en) | ||
JP2018101103A5 (en) | ||
JP2005157153A5 (en) | ||
CN104730692A (en) | Full-frame lens of micro single-lens reflex camera |