New patent news coming from patent hunter Japanese blog egami, the latest technology aims at improving speed and accuracy of the current AF system used by Canon, So we may see some more advance AF system based PRO and Entry level DSLR camera in near future.
Patent details translated by google
- Patent Publication No. 2010-60771
- 2010.3.18 Release Date
- 2008.9.3 filing date
- Existing techniques
- Patent Publication No. H11-281878
- Different lengths of baseline using the AF sensor
- F2.8 sensor: high focusing accuracy
- Can detect a wide range of defocus amount (the amount of deviation of focus): F5.6 sensor
- After roughly at F5.6 sensor is focused, making focus F2.8 sensor with high accuracy
- Drawback
- Depending on the timing F2.8 sensor is not used, focusing accuracy is not good
- Canon’s patent
- Different lengths of baseline using the AF sensor
- Because of the defocus amount detection range is limited, must search as duplicate detection range
- By using the F5.6 sensor, within a limit not exceeding the amount of defocus, it is possible to focus lens is driven at high speed
- If the Live View
- The image plane using phase difference AF
- Focus lens is driven at high speed
- Using the central pixel: When low-intensity
- Using the neighboring pixels: When high-intensity
- Different lengths of baseline using the AF sensor
for a quick reminder Canon recently announced 650D and Canon EOS M with hybrid AF system
News src –Egami | See more Canon Patents
