TW200712591A - Projection lens with fixed focal length - Google Patents
Projection lens with fixed focal lengthInfo
- Publication number
- TW200712591A TW200712591A TW094132014A TW94132014A TW200712591A TW 200712591 A TW200712591 A TW 200712591A TW 094132014 A TW094132014 A TW 094132014A TW 94132014 A TW94132014 A TW 94132014A TW 200712591 A TW200712591 A TW 200712591A
- Authority
- TW
- Taiwan
- Prior art keywords
- focal length
- lens group
- projection lens
- lens
- projection
- Prior art date
Links
Landscapes
- Lenses (AREA)
Abstract
The invention provides a projection lens with fixed focal length. The projection lens includes a first lens group with negative optical power and a second lens group with positive optical power in sequence from the enlarging side to the reducing side. When the distance between the projection screen and the projection lens is varied, the first lens group is moved to obtain a good image on the screen, meanwhile, the distance between the second lens group and the display element is fixed. The projection lens satisfies the following condition: wherem f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW094132014A TWI268381B (en) | 2005-09-16 | 2005-09-16 | Projection lens with fixed focal length |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW094132014A TWI268381B (en) | 2005-09-16 | 2005-09-16 | Projection lens with fixed focal length |
Publications (2)
Publication Number | Publication Date |
---|---|
TWI268381B TWI268381B (en) | 2006-12-11 |
TW200712591A true TW200712591A (en) | 2007-04-01 |
Family
ID=57911298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW094132014A TWI268381B (en) | 2005-09-16 | 2005-09-16 | Projection lens with fixed focal length |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI268381B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI503566B (en) | 2013-10-31 | 2015-10-11 | 玉晶光電股份有限公司 | An optical imaging lens and an electronic device to which the optical imaging lens is applied |
TWI484247B (en) | 2013-12-20 | 2015-05-11 | 玉晶光電股份有限公司 | Camera device and optical imaging lens thereof |
TWI477808B (en) * | 2014-01-17 | 2015-03-21 | Largan Precision Co Ltd | Image capturing lens assembly, image capturing device and automobile photographing terminal |
-
2005
- 2005-09-16 TW TW094132014A patent/TWI268381B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
TWI268381B (en) | 2006-12-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |