Zoom lens
First Claim
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1. A zoom lens comprising:
- a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, arranged in said order from object side to image side, for zooming from a wide-angle end to a telephoto end as well as for correcting image surface changes required in accordance with said zooming by means of moving said second lens group and said third lens group from image side to object side;
wherein said first lens group consists of a lens having a negative refractive power and a prism for changing a light path arranged in said order from the object side.
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Abstract
The present invention provides a small, thin, light and low cost zoom lens suitable for cellular telephones, portable information terminals, etc. In particular, it can provide a small and thin, high performance zoom lens having a zoom ratio of approximately 2, a depth of less than 9 mm in shooting and storage, a total lens length of less than 29 mm, an angle of view of approximately 61°, and a F number of 2.8 or higher providing a sufficient light, with various aberrations all suitably corrected.
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18 Claims
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1. A zoom lens comprising:
- a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, arranged in said order from object side to image side, for zooming from a wide-angle end to a telephoto end as well as for correcting image surface changes required in accordance with said zooming by means of moving said second lens group and said third lens group from image side to object side;
whereinsaid first lens group consists of a lens having a negative refractive power and a prism for changing a light path arranged in said order from the object side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a third lens group having a positive refractive power as a whole, arranged in said order from object side to image side, for zooming from a wide-angle end to a telephoto end as well as for correcting image surface changes required in accordance with said zooming by means of moving said second lens group and said third lens group from image side to object side;
Specification