Lens system for photodetectors

• US 6,150,653 A
• Filed: 02/16/1999
• Issued: 11/21/2000
• Est. Priority Date: 11/25/1998
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Raj, Kannan, Sundahl, Robert C., Assadi, Azar
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US09/250,910
• Time in Patent Office: 644 Days
• Field of Search: 250/208.1, 250/216, 250/241.1
• US Class Current: 250/216
• CPC Class Codes: G02B 27/0037 with diffracting elements G02B27/0056 takes precedence; holographic optical elements G02B5/32; zone systems G02B5/1876
• CPC Class Codes: G02B 27/4211 correcting chromatic aberrations G02B27/0056, G02B27/4222, G02B27/4227 take precedence
• CPC Class Codes: G02B 5/1885 Arranged as a periodic array
• CPC Class Codes: H01L 27/14627 Microlenses
• CPC Class Codes: H01L 31/02162 for filtering or shielding light, e.g. multicolour filters for photodetectors
• CPC Class Codes: H01L 31/02327 the optical elements being integrated or being directly associated to the device, e.g. back reflectors optical coatings H01L31/0216
• CPC Class Codes: H04N 1/0311 using an array of elements to project the scanned image elements onto the photodetectors H04N1/0318 takes precedence
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof

Abstract

An photosensitive device may be formed with a diffractive lens which offsets chromatic aberrations and dispersion caused by a refractive capture lens. The diffractive lens may be formed of a sol-gel material having a photoinitiator, or other materials including those that may be defined with low temperature techniques commonly used in connection with photoresist.

Claims

1. A photodetector comprising:

a packaged photosensitive device;

a diffractive lens arranged on said packaged photosensitive device, said lens formed of a sol-gel material including a photoinitiator, said lens having a stepped configuration including a plurality of surfaces stacked one upon the other; and

a window formed over said packaged photosensitive device, said lens being formed over said window.