Unlock instant, AI-driven research and patent intelligence for your innovation.
Variable power zoom lens
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A zoom lens, high magnification technology, applied in the direction of optical components, optics, instruments, etc.
Inactive Publication Date: 2013-09-18
TAMRON
View PDF5 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Therefore, if the peripheral portion of the convex lens of the first lens group is ensured so as to be practical, the effective aperture of the first lens group will become large, resulting in the inability to realize miniaturization.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
no. 1 example
[0063] Such as figure 1 As shown, the high magnification zoom lens of the first embodiment includes in order from the object side: the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, and the fourth lens group G3 with positive refractive power. Lens group G4.
[0064] The data of the first embodiment are as follows.
[0070] Hereinafter, the aspheric coefficients of the respective aspheric surfaces are displayed in the order of K, 2(A), 4(B), 6(C), 8(D), 10(E), and 12(F).
[0095] Such as Figure 8 As shown, the high magnification zoom lens of the second embodiment includes in order from the object side: the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, and the fourth lens group G3 with positive refractive power. Lens group G4.
[0096] The data of the second example are as follows.
[0102] Hereinafter, the aspheric coefficients of the respective aspheric surfaces are displayed in the order of K, 2(A), 4(B), 6(C), 8(D), 10(E), and 12(F).
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The present invention is a variable power zoom lens that is suitable to APS-format single-lens reflex cameras. The zoom lens has the foremost or first lens group G1 of positive refractivity, the second lens group G2 of negative refractivity, the third lens group G3 of positive refractivity, and the fourth lens group G4 of positive refractivity disposed in sequence from a position closer to the object toward the image plane, and it meets requirements as defined in conditional formulae as follows: 6<Lw / (Ft / Fw)<10 where Lw is the entire length of the lens optics (i.e., from the front surface of the foremost lens piece to the image plane) at the wide-angle end, Ft is a focal length of the lens optics in whole at the telephoto end, and Fw is the focal length of the lens optics in whole at the wide-angle end.
Description
technical field [0001] The invention relates to a high-magnificationzoom lens, in particular to a high-magnificationzoom lens with a zoom ratio of more than 15 times and a viewing angle of more than 75 degrees at the wide-angle end, which is suitable for a small APS size SLR camera. Background technique [0002] As a conventional high-magnificationzoom lens, there is proposed a zoom lens for APS size, which has a first lens group with positive refractive power, a second lens group with negative refractive power, and a lens group with negative refractive power in order from the object side. The third lens group with positive refractive power and the fourth lens group with positive refractive power, and zooming is performed by changing the interval between the aforementioned lens groups, which is characterized in that: [0003] The third lens group is composed of a front group having a positive refractive power and a rear group having a negative refractive power arranged se...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More