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US 8,508,836 B2Granted
Image pickup optical system and image pickup apparatus using the same
AssigneeOlympus Corporation
InventorTakuya Ohtsu
Life of this patent
Estimating the term…
Abstract
An image pickup optical system made of five lenses, includes in order from an object side, an aperture stop, a first lens L1 having a positive refracting power, a second lens L2 having a negative refracting power, a third lens L3 having a positive refracting power, a fourth lens L4 having a positive refracting power, and a fifth lens L5 having a negative refracting power. Moreover, an image pickup apparatus includes this image pickup optical system.
Claims20
An image pickup optical system, comprising:
- a plurality of lenses and an aperture stop;
- wherein the plurality of lenses consists of five lenses, the image pickup optical system comprising in order from an object side:
- the aperture stop;
- a first lens having a positive refracting power;
- a second lens having a negative refracting power;
- a third lens;
- a fourth lens having a positive refracting power;
- and
- a fifth lens having a negative refracting power,
- wherein the image pickup optical system has a fixed focal length, and
- at least one of surfaces of the fifth lens has an inflection point, and the image pickup optical system satisfies the following conditional expressions
- −1.27<r8/f<−0.25
- 0.36<f4/f≦0.98
- where,
- f denotes a focal length of the overall image pickup optical system,
- f4 denotes a focal length of the fourth lens, and
- r8 denotes a paraxial radius of curvature of an object side surface of the fourth lens.
14 more elements
An image pickup apparatus comprising:
- an image pickup optical system;
- and
- an electronic image pickup element having an image pickup surface which receives an image from the image pickup optical system,
- wherein the image pickup optical system comprises in order from an object side:
- an aperture stop;
- a first lens having a positive refracting power;
- a second lens having a negative refracting power;
- a third lens;
- a fourth lens having a positive refracting power;
- and
- a fifth lens having a negative refracting power,
- wherein the image pickup optical system has a fixed focal length, and
- at least one of surfaces of the fifth lens has an inflection point, and the image pickup optical system satisfies the following conditional expressions
- −1.27<r8/f<−0.25
- 0.36<f4/f≦0.98
- where,
- f denotes a focal length of the overall image pickup optical system,
- f4 denotes a focal length of the fourth lens, and
- r8 denotes a paraxial radius of curvature of an object side surface of the fourth les.
16 more elements
An information terminal comprising:
- an input section which operates the information terminal;
- a processing section which processes at least information from the input section;
- an image pickup apparatus which obtains image information based on the information from the processing section;
- an image processing section which processes the image information obtained by the image pickup apparatus;
- a display section which displays the processed image,
- wherein
- the image pickup apparatus comprises:
- an image pickup optical system;
- and
- an electronic image pickup element having an image pickup surface which receives an image from the image pickup optical system,
- wherein the image pickup optical system comprises in order from an object side:
- an aperture stop;
- a first lens having a positive refracting power;
- a second lens having a negative refracting power;
- a third lens;
- a fourth lens having a positive refracting power;
- and
- a fifth lens having a negative refracting power,
- wherein the image pickup optical system has a fixed focal length, and
- at least one of surfaces of the fifth lens has an inflection point, and the image pickup optical system satisfies the following conditional expressions
- −1.27<r8/f<−0.25
- 0.36<f4/f≦0.98
- where,
- f denotes a focal length of the overall image pickup optical system,
- f4 denotes a focal length of the fourth lens, and
- r8 denotes a paraxial radius of curvature of an object side surface of the fourth lens.
23 more elements
Dependencies are inferred from the claim text.