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Image-formation optical system, and imaging system incorporating the sameImage-formation optical system, and imaging system incorporating the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080049337, Image-formation optical system, and imaging system incorporating the same. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefits of Japanese Application(s) No. 2003-2828 filed in Japan on 1.9, 2003, No. 2003-20587 filed in Japan on 1.29, 2003, Nos. 2003-39480 and 2003-39481 filed in Japan on 2.18, 2003 and No. 2003-44053 filed in Japan on 2.21, 2003, the contents of which are herein incorporated by this reference. BACKGROUND OF THE INVENTION [0002] The present invention relates generally to an image-formation optical system and an imaging system that incorporates the same. More particularly, the invention is concerned with imaging systems such as digital still cameras, digital video cameras, small-format cameras mounted on cellular phones and personal computers, and surveillance cameras or the like, all harnessing solid-state image pickup devices, e.g., CCDs or CMOSs, [0003] In recent years, electronic cameras using solid-state image pickup devices such as CCDs or CMOSs to take subject images have come into wide use in place of silver-halide film cameras. For imaging systems mounted on portable computers, cellular phones, etc. among those electronic cameras, size and weight reductions are especially demanded. [0004] Some conventional image-formation optical systems used with such imaging systems are made up of one or two lenses. With those optical systems, however, any high performance is not expectable because of their inability to correct field curvature, as already known from discussions about aberrations. To achieve high performance, therefore, it is required to use three or more lenses. [0005] Referring on the other hand to a CCD, as off-axis light beams leaving an image-formation lens system are incident on an image plane at too large an angle, a microlens fails to perform its own light-condensation capability, offering a problem that the brightness of an image changes extremely between the central and the peripheral portion of the image. Thus, the angle of incidence of light on the CCD, that is, the position of an exit pupil becomes important in view of design. To an optical system comprising fewer lenses, the position of an aperture stop becomes important. [0006] Among image-formation lenses with these problems taken into account, there is a triplet type with a stop located at the front, as set forth typically in the following patent publications 1, 2, 3, 4, 5 and 6. [0007] However, all those prior arts have problems in conjunction with performance and size. [0008] Patent Publication 1 [0009] JP-A 1-144007 [0010] Patent Publication 2 [0011] JP-A 2-191907 [0012] Patent Publication 3 [0013] JP-A 4-153612 [0014] Patent Publication 4 [0015] JP-A 5-188284 [0016] Patent Publication 5 [0017] JP-A 9-288235 [0018] Patent Publication 6 [0019] JP-A 2001-75006 SUMMARY OF THE INVENTION [0020] In consideration of such problems with the prior arts as mentioned above, one object of the present invention is to provide an image-formation optical system that can meet demands for high performance and significant compactness at the same time, and an imaging system that incorporates the same. [0021] Another object of the present invention is to provide an image-formation optical system that can meet demands for high performance and significant compactness at the same time, and can accommodate well to a wide-angle arrangement, and an imaging system that incorporates the same. [0022] Yet another of the present invention is to provide a wide-angle image-formation optical system with a half angle of view of about 35.degree., which can meet demands for high performance and significant compactness at the same time as well as an imaging system that incorporates the same. Continue reading about Image-formation optical system, and imaging system incorporating the same... Full patent description for Image-formation optical system, and imaging system incorporating the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Image-formation optical system, and imaging system incorporating the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Image-formation optical system, and imaging system incorporating the same or other areas of interest. ### Previous Patent Application: Projection optical system and method for photolithography and exposure apparatus and method using same Next Patent Application: Lens barrel and photographing apparatus Industry Class: Optical: systems and elements ### FreshPatents.com Support Thank you for viewing the Image-formation optical system, and imaging system incorporating the same patent info. IP-related news and info Results in 0.2622 seconds Other interesting Feshpatents.com categories: Medical: Surgery , Surgery(2) , Surgery(3) , Drug , Drug(2) , Prosthesis , Dentistry 174 |
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