Sharp Kabushiki Kaisha Corporation

Ryo Abe

Kohji Minami

Minoru Ueda

Shozo Minamide

A lens tube has two, first and second lenses (), a tubular lens frame () for holding the two lenses (), and three spacers () in contact with the opposite lens surfaces of the first and second lenses (). The spacers () are arranged so as to be in contact with curved surfaces of the first and second lenses () and determine the distance between the first and second lenses (). The lens frame () has the same inner diameter between the first and second lenses (), and the spacers () are in contact with the inner wall of the lens frame (). Since the lens frame () has the same inner diameter between the first and second lenses (), the first and second lenses () are held with their centers perfectly aligned with each other.

Lens tube, method of assembling lens tube, and camera module

First, second, third and fourth lens groups of a zoom lens portion are arranged on an optical axis in order from an object to be imaged side toward an electronic imaging device. The first lens group has a negative refracting power and a fixed position on the optical axis. The second lens group has a positive refracting power and is moved along the optical axis to effect focusing. The third lens group has a positive refracting power and is moved along the optical axis during a magnification change. The fourth lens group has a fixed position on the optical axis. An angle of incidence of a ray of a maximum image height when the zoom lens portion is in a state at a telephoto end is not greater than the angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in a state at a wide angle end. The angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in the state at the telephoto end is not smaller than 5&#xb0;.

Growing community of inventors

Tenri, Japan

Ryo Abe