| dc.description.abstract | Abstract
This therio proposes two designs, including periscope type of three times zoom lens for eight mega pixels and five mega pixels in a mobile phone camera respectively.
The periscope zoom lens is to add a right angle prism in front of the general zoom lens, which is to change the direction of the light path. The following are the design specifications of the three times zoom lens for eight-mega-pixels mobile phone camera, where the effective focal length is 3.5321 mm to 10.5963 mm, half angle of view is 32.9 to 12.1691, F/# is 2.8 to 5.5, and entrance pupil is 1.2615 mm to 1.9266 mm.
The lens depth is which the thickness of the prism or the maximum aperture in the Y direction of the lens, when lens depth is less than the thickness of the mobile phone, it can be placed in the mobile phone. The factors that affect the lens depth include the length of the sensor in the Y axis direction, the zooms of the lens, the entrance pupil diameter, the entrance pupil position, and the angle of view in the Y direction.
If compared with the sensor aspect ratio of 4:3, using a sensor with an aspect ratio of 16:9, under a fixed diagonal length, the length of the sensor in the Y axis direction will decrease, and the angle of view in the Y direction also decreases. Use real ray trace to decide the maximum aperture in the X direction and the maximum aperture in the Y direction, then the maximum aperture in the Y direction of the lens can be reduced by cut lens. The final lens depth is 4.98 mm. If the sensor pixel is reduced to 5 million, the lens depth can be 3.98 mm, it should be able to be placed inside the mobile phone. | en_US |