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New Optical Formula Patents
A new patent showcasing 3 different focal lengths has come to light.
- Patent Publication No. 2012-8352
- 2012.1.12 Release Date
- Filing date 2010.6.25
- Example 1
- Focal length f = 294.0mm
- Fno = 4.14
- = 8.42deg angle.
- 15 sheets 11 groups configured
- One element radial refractive index profile
- Bowen ratio 0.78
- Inner Focus (the second lens group for focusing)
- Example 3
- Focal length f = 51.5mm
- Fno = 1.25
- = 45.6deg angle.
- Configuration 6 each group 10
- Two elements radial refractive index profile
- One aspherical surface 1
- Example 4
- Focal length f = 24.7mm
- Fno = 2.86
- = 82.4deg angle.
- Configure each group 11 10
- One element radial refractive index profile
- Rear focus (the third lens group and the second lens for focusing)
- The principle cause chromatic aberration
- Light is refracted at the interface of the lens
- Within the lens are not refracted rays
- The refractive index is different for each wavelength
- Element and the axial refractive-index distribution is
- Refractive index change in the direction of optical axis
- This patented technology is not used (as introduced)
- Element and the radial refractive index profile is
- Refractive index change in a direction perpendicular to the optical axis
- Rays are refracted at the boundary and both the lens in the lens (chromatic aberration occurs).
- Chromatic aberration can be corrected if appropriate refractive index profile
- Rather than spherical or aspherical, planar (flat glass), but I (easy processing)
- Canon's patented
- Elements to create a radial refractive index profile optimized for each wavelength the refractive index profile is difficult
- Patented technology, the characteristics of chromatic dispersion (Abbe number, a partial dispersion ratio) to optimize, to compensate for chromatic aberration
- Optimize the calculation, line d, line C, line F, to compensate for chromatic aberration of four wavelengths simultaneously in the g-line
- Create a radial refractive index profile element as a mixture of resin
Source: [EG]
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