Optical device for testing an image sensor
An optical device includes a first lens group arranged between a light-passing module and an object side. A second lens group is arranged between the light-passing and an image sensor. The light-passing control module is disposed between the first lens group and the second lens group, and is configured to control amount of light incident based on a chief ray angle. The light-passing control module includes an aperture stop. The position of the aperture stop is adjustable along the optical axis of the optical device. Alternatively, the aperture stop is disposed inside a rotating bezel. The chief ray angle of the optical device is changed by adjusting the opening and the position of the aperture stop.
1 . An optical device for testing an image sensor, comprising:
a first lens group arranged between a light-passing control module and an object side;
a second lens group arranged between said light-passing control module and said image sensor;
wherein said light-passing control module is disposed between said first lens group and said second lens group, configured to control an amount of light incident based on a chief ray angle; and
wherein said first lens group and said second lens group include a positive lens power, wherein said light-passing control module includes an aperture stop, a position of said aperture stop being dependent on said chief ray angle, said aperture stop being placed closer to said first lens group for a first chief ray angle, said aperture stop being placed closer to said second lens group for a second chief ray angle, wherein said first chief ray angle is smaller than said second chief ray angle.
2 . The optical device of claim 1 , wherein said position of said aperture stop is adjustable along an optical axis of said optical device.
3 . The optical device of claim 2 , wherein said light-passing control module includes a rotating bezel with said aperture stop disposed inside.
4 . The optical device of claim 2 , wherein said light-passing control module includes a sub-module with said aperture stop being replaceable at various positions along said optical axis between said first lens group and said second lens group.
5 . The optical device of claim 2 , wherein said position of said aperture stop is dependent on said chief ray angle of said optical device.
6 . The optical device of claim 5 , wherein said chief ray angle of said optical device is changed through adjusting said position of said aperture stop inside said light-passing control module, wherein optical specifications of said optical device are approximately constant while said aperture stop is adjusted.
7 . The optical device of claim 6 , wherein said optical specifications include a F-number and a field of view.
8 . The optical device of claim 1 , wherein said second lens group has a lens power 2 to 20 times of that of said first lens group.
9 . The optical device of claim 1 , wherein at least one lens of said first lens group is a first aspheric lens, wherein at least one lens of said second lens group is a second aspheric lens.
10 . The optical device of claim 1 , wherein a ratio of a maximum lens diameter (T) of said optical device to an image height (D) of said image sensor, T/D, is in range of 2.0~2.4.
11 . An optical device for testing an image sensor, comprising:
a first lens group arranged between an aperture stop and an object side;
a second lens group arranged between said aperture stop and said image sensor;
wherein said aperture stop is disposed between said first lens group and said second lens group and is configured to change a chief ray angle of said optical device; and
wherein said first lens group and said second lens group include a positive lens power, wherein a position of said aperture stop being dependent on said chief ray angle, said aperture stop being placed closer to said first lens group for a first chief ray angle, said aperture stop being placed closer to said second lens group for a second chief ray angle, wherein said first chief ray angle is smaller than said second chief ray angle.
12 . The optical device of claim 11 , wherein a said position of said aperture stop is variable along an optical axis of said optical device.
13 . The optical device of claim 12 , wherein said aperture stop is disposed inside a rotating bezel.
14 . The optical device of claim 12 , wherein said aperture stop is disposed in a sub-module being replaceable at various positions along said optical axis between said first lens group and said second lens group.
15 . The optical device of claim 12 , where said chief ray angle of said optical device is changed through adjusting an opening and said position of said aperture stop, wherein optical specifications of said optical device are approximately constant while said aperture stop is adjusted.
16 . The optical device of claim 15 , wherein said optical specifications include a F-number and a field of view.
17 . The optical device of claim 11 , wherein said second lens group has a lens power 2 to 20 times of that of said first lens group.
18 . The optical device of claim 11 , wherein said first lens group includes two or three lenses and at least one of said lenses is a first aspheric lens.
19 . The optical device of claim 11 , wherein said second lens group includes three or four or five lenses and at least one of said lenses is a second aspheric lens.
20 . The optical device of claim 11 , wherein a ratio of a maximum lens diameter (T) of said optical device to an image height (D) of said image sensor is in range of 2.0~2.4.