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Lenses for electronic imaging systems

  • US 6,097,551 A
  • Filed: 05/25/1999
  • Issued: 08/01/2000
  • Est. Priority Date: 11/29/1996
  • Status: Expired due to Fees
First Claim
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1. A lens system for forming an image of an object, said system having a focal length f0 and consisting in order from its object side to its image side of:

  • (a) a first lens element having a focal length f1 and a thickness t1 ; and

    (b) a second lens element having a focal length f2, said second lens element being spaced from the first lens element by a distance d12 ;

    wherein;

    
    
    space="preserve" listing-type="equation">f.sub.1 <

    0;

    
    
    space="preserve" listing-type="equation">|f.sub.1 |/f.sub.0 >

    1.0;

    
    
    space="preserve" listing-type="equation">t.sub.1 /f.sub.0 >

    0.5;

    
    
    space="preserve" listing-type="equation">f.sub.2 >

    0; and

    
    
    space="preserve" listing-type="equation">d.sub.12 /f.sub.0 >

    0.25.

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