TW200736808A - Projector automatic focusing method and focusing system - Google Patents
Projector automatic focusing method and focusing systemInfo
- Publication number
- TW200736808A TW200736808A TW095110300A TW95110300A TW200736808A TW 200736808 A TW200736808 A TW 200736808A TW 095110300 A TW095110300 A TW 095110300A TW 95110300 A TW95110300 A TW 95110300A TW 200736808 A TW200736808 A TW 200736808A
- Authority
- TW
- Taiwan
- Prior art keywords
- semi
- lens
- focusing
- reflection
- trasmissive
- Prior art date
Links
Abstract
A projector automatic focusing method and focusing system comprises steps of (1) projecting an image onto a screen through a projection lens; (2) making a first signal of the image pass through a first focusing lens and a semi- trasmissive/semi-reflection lens to reach an image sensing unit; (3) making a second signal of the image pass through a second focusing lens and then be reflected by a reflection mirror and the semi- trasmissive /semi-reflection lens to reach the image sensing unit, in which a constant separation distance exists between the reflection mirror and the semi- trasmissive /semi-reflection lens; (4) rotating the reflection mirror with a conversion included angle to allow the first and the second signals to completely overlap; (5) calculating a projection distance which is equal to cotangent of double angle of the conversion included angle multiplying the constant separation distance according to the conversion included angle and the constant separation distance; and (6) adjusting the focus of the projection lens to match the projection distance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW095110300A TW200736808A (en) | 2006-03-24 | 2006-03-24 | Projector automatic focusing method and focusing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW095110300A TW200736808A (en) | 2006-03-24 | 2006-03-24 | Projector automatic focusing method and focusing system |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200736808A true TW200736808A (en) | 2007-10-01 |
TWI306538B TWI306538B (en) | 2009-02-21 |
Family
ID=45071404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW095110300A TW200736808A (en) | 2006-03-24 | 2006-03-24 | Projector automatic focusing method and focusing system |
Country Status (1)
Country | Link |
---|---|
TW (1) | TW200736808A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI406083B (en) * | 2010-07-09 | 2013-08-21 | Asia Optical Co Inc | Projection device with auto focus function and its auto focus method |
TWI448808B (en) * | 2008-01-25 | 2014-08-11 | Chi Mei Comm Systems Inc | System and method for adjusting focus of a projection automatically |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10192856B2 (en) | 2014-12-30 | 2019-01-29 | Pixart Imaging Inc. | Optical navigation module capable of performing lateral detection and adjusting tracking distance |
-
2006
- 2006-03-24 TW TW095110300A patent/TW200736808A/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI448808B (en) * | 2008-01-25 | 2014-08-11 | Chi Mei Comm Systems Inc | System and method for adjusting focus of a projection automatically |
TWI406083B (en) * | 2010-07-09 | 2013-08-21 | Asia Optical Co Inc | Projection device with auto focus function and its auto focus method |
Also Published As
Publication number | Publication date |
---|---|
TWI306538B (en) | 2009-02-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |