Zoom lens and electronic imaging apparatus having the same

An electronic imaging apparatus comprising:

• a zoom lens;
• an electronic image sensor;
• and
• an image processing unit,
• the zoom lens comprising:
• a lens unit located at a most object-side position;
• and
• a moving lens unit with positive refracting power, located on an image side of the lens unit,
• the lens unit including a single positive lens and the moving lens unit being simply moved toward an object side when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position so as to satisfy the following condition:
• 0.8<y07/(fw·tan ω07w)<0.96
• where fw is a focal length of an entire system of the zoom lens at the wide-angle position, y07 is an image height expressed by 0.7×y10, where y10 is a distance from a center to a point farthest therefrom on an effective imaging surface of an electronic image sensor, and ω07w is an angle made by a direction of an object point with an optical axis, where the object point corresponds to an image point that is at the point y07 away from the center on the effective imaging surface of the electronic image sensor at the wide angle position,
• the image processing unit having steps that image data imaged by the electronic image sensor are electrically processed and contour thereof is changed.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the first lens unit has two aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the first lens unit and the second lens unit have four aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein each of the first lens unit and the second lens unit has two aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the second lens unit and the third lens unit have four aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein each of the second lens unit and the third lens unit has two aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side.

An electronic imaging apparatus comprising:

• a zoom lens;
• an electronic image sensor;
• and
• an image processing unit,
• the zoom lens comprising:
• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the first lens unit has two aspherical surfaces, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side,
• the image processing unit having steps that image data imaged by the electronic image sensor are electrically processed and contour thereof is changed.

A zoom lens comprising:

• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the first lens unit has a reflecting surface, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side to satisfy the following conditions:
• −1.0≦β2W≦−0.40 −1.0≦β3W≦−0.40
• where β2 W is the magnification of the second lens unit at the wide-angle position and β3 W is the magnification of the third lens unit at the wide-angle position.

An electronic imaging apparatus comprising:

• a zoom lens;
• an electronic image sensor;
• and
• an image processing unit,
• the zoom lens comprising:
• the zoom lens comprising:
• a first lens unit with positive refracting power, located at a most object-side position;
• a second lens unit with negative refracting power, located on an image side of the first lens unit;
• and
• a third lens unit with positive refracting power, located on the image side of the second lens unit,
• wherein the first lens unit has a reflecting surface, and when a magnification of the zoom lens is changed in a range from a wide-angle position to a telephoto position, the second lens unit is moved and the third lens unit is simply moved toward an object side to satisfy the following conditions:
• −1.0≦β2W≦−0.40 −1.0≦β3W≦−0.40
• where β2 W is the magnification of the second lens unit at the wide-angle position and β3 W is the magnification of the third lens unit at the wide-angle position.
• the image processing unit having steps that image data imaged by the electronic image sensor are electrically processed and contour thereof is changed.