Photographic lenses - zoom

November 10, 2019 - 2 zoom lenses posted from Handbook of Optics

February 8, 2017 -  59 zoom lens designs posted, including 5 by Obama
              The patent literature is full of zoom lenses.  In January 2017 alone, at least 17 zoom lens patents were issued.  The posted files are a sampling of some of the subcategories I've been interested in, including compact zooms for DSC cameras, high quality zooms for full-frame photography, and lenses for television cameras with large zoom ratios.

April 8, 2015 -  55 zoom lens designs posted 
              Today I posted 56 zoom lens files.  All are for folded zooms, which provide an interesting study.  As I described in a paper at the 2014International Optical Design Conference, this class of optics is interesting be they are of a reasonable complexity that the designs are likely to be instructive, they offer a small range of design constraints because of the standardization of CMOS imager sizes and the mechanical constraints imposed on DSC cameras, and there is enough recent activity in awarded patents that a representative sample of contemporary designs can be collected.  You can find the design files and some analysis on the page for zoom lenses.

Some of the interesting conclusions from the IODC paper include:
- An analysis of the most-common glass types for this application.
The most-frequently disclosed glass type is n=1.855, V = 24, which corresponds to glasses such as FDS90 and N-SF57; its prevalence suggests the adoption of high index glasses despite their coloration and workability. The next most-widely disclosed glass type is n= 1.505, V = 82, which corresponds to glasses such as MC-FCD1-M20; its prevalence suggests widespread use of glass molding, which is consistent with the high volumes in this application. The most-common glass types are listed in the table below:
 n V # of occurrences
 Glass types
 1.855 24 148 FDS90, N-SF57
 1.505 82 59 MC-FCD1-M20, FCD1, N-PK52A
 1.535 56 54 E48R
 1.885 41 52 TAFD30, N-LASF31A
 1.925 21 50 E-FDS1, M-FDS1
 1.495 70 42 J-FK5, FK5
 1.735 55 40 LAK18, H-LaK52
- Even for the designs with the most-similar paraxial properties, and, probably, the most-similar design constraints, the resultant designs are quite different.
US Pat# 7,193,786 and US Pat# 7,417,800 have almost identical in terms of f/#, image size, focal length, zoom ratio, length, # of zoom groups, # of elements, and # of aspheres; however, the designers arrived at quite different solutions for what was apparently the same set of design constraints. Differences between the two designs include: 1) The third group in the ‘786 design, is a doublet, while the third group in the design disclosed in the ‘800 design, is a singlet. 2) The front element in the ‘786 design is meniscus, while the front surface of the ‘800 design is nearly planar. This difference is significant in a functional sense in that the nearly-planar front surface might offer some attractive packaging options. 3) The bi-aspheric element in the ‘800 design is nearly at the stop, while the bi-aspheric element in the ‘786 design is at the far side of the group from the stop. 4) Although the total number of elements is the same, the number of elements in groups two and three aren’t the same for the two designs. 5) Group 2 in the ‘800 design includes a particularly low-index material.
I found it interesting that these differences weren’t reflected in the patent claims. The key differentiator in the patents is the power across the various zoom groups.


Listing of design files:

 Design basis
 program  image size
(1/2 diag, mm)
 f/#
 efl
(mm)

 Notes
 Handbook ex. 14Zemax21  3-4 72-203 
 Handbook ex. 16Zemax  21 4-6 30-150 
 US09310592-1.zmx Zemax 142.8 - 3.4 16-112 
 US09151935-3.zmx Zemax 214.2 - 4.2 72-194 
 US09151935-2.zmx Zemax 214.1 - 4.1 204-390 
 US09151935-1.zmx Zemax 214.1 - 4.1 204-390 
 US09030755-1.zmx Zemax 143.6 - 5.9 18-291 Obama invention!
 US08988786-1.zmx Zemax 152.6 - 2.6 25-65 
 US08810918-1.zmx Zemax 213.0 - 3.0 25-70 
 US08593736-1.ZMX Zemax 5.51.9 - 4.0 7-620 
 US08503097-1.ZMX Zemax 214.6 - 5.9 91-395 
 US08373933-3.zmx Zemax 212.5 - 3.2 48-77 
 US08373933-2.zmx Zemax 12 1.8-2.6 18-29 
 US08320053-1.ZMX Zemax 2.3 1.7 - 4.0 3.6-127 
 US08238036-1.ZMX Zemax 14 4.0 - 5.8 52-196 
 US08184377-1.ZMX Zemax 3.7 2.8 - 5.7 5-138 
 US08179609-1.ZMX Zemax 5.0 1.8 - 1.8 7.8-164 
 US08169712-1.ZMX Zemax 3.7 2.8 - 5.9 4.5-105 
 US08169711-1.ZMX Zemax 3.7 2.8 - 5.1 4.4-76 
 US08159757-1.ZMX Zemax 3.7 3.6 - 5.7 4.3-41 
 US08159756-1.ZMX Zemax 4.0 3.3 - 6.0 5-37 
 US08149516-1.ZMX Zemax 5.5 2.0 - 2.0 7-113 
 US08130451-1.ZMX Zemax 1.15 1.9 - 5.0 2-114 
 US08040614-1.ZMX Zemax 0.65 1.8 - 3.5 1-7.6 
 US08014079-1.ZMX Zemax 3.7 3.6 - 6.1 4.5-35 
 US08004772-1.ZMX Zemax 3.7 2.9 - 6.1  4.3-21 
 US08000024-1.ZMX Zemax 3.7 3.3 - 5.6 5.1-49 
US07933072-1.ZMX Zemax 30 4.1 - 6.2 36-87 
 US07920327-1.ZMX Zemax 3.6 2.8 - 6.0 5-20 
 US07869136-1.ZMX Zemax 3.6 2.8 - 5.3 4.8-84 
 US07830612-1.ZMX Zemax 3.8 3.1 - 5.7 4.3-43 
 US07782543-1.ZMX Zemax 3.7  5-53 
 US07777967-1.ZMX Zemax 4.52.8 - 5.4 5.8-28 
 US07688520-1.ZMX Zemax 4.65 2.8 - 5.6 6.2-30 
 US07672063-1.ZMX Zemax 8 3.2 - 5.9 10-105 
 US07639430-1.ZMX Zemax 20 3.0 - 3.0 16-34 
 US07609460-1.ZMX Zemax0.54 1.8 - 2.6 1.0-13.8 
 US07589908-1.ZMX Zemax 2.6 1.9 - 3.0 4.9-58 
 US07502173-1.zmx Zemax 5.5 2.9 - 5.7 9-86 Obama invention!
 US07492526-1.zmx Zemax 3.75 2.8 - 4.7 6.5-73 
 US07492525-1.zmx Zemax 3.32.6 - 3.9 5.7-38 
 US07492524-1.zmx Zemax 14 3.6 - 5.7 16-83 
 US07489452-1.zmx Zemax 21 4.1 - 4.1 61-243 
 US07218455-1.zmx Zemax 3.4 2.9 - 6.2 5.7-16 folded
 US07142372-1.zmx Zemax 2.2 2.8 - 6.2 3.5-10 
 US07139129-1.zmx Zemax 3.0 2.8 - 4.9 6.2-18 
 US07106522-1.zmx Zemax 3.6 2.8 - 5.4 6-18 
 US07085067-1.zmx Zemax 2.2 2.8 - 3.9 3.1-6.0 
 US07072121-2.zmx Zemax 1.3 2.9 - 4.2 1.9-3.8 
 US06977778-1.zmx Zemax 2.9 2.8 - 4.9 6.3-18.1 
 US06930839-2.zmx Zemax 2.8 3.0 - 4.4 1.8-3.6 
 US06870688-1.zmx Zemax 5.5 2.8 - 4.6 7-21 Obama invention!
 US06710934-1.zmx Zemax 2.9 2.8 - 5.0 5-14 
 US06597514-1.zmx Zemax 10 5.6 - 10 30-77 
 US06333824-1.zmx Zemax 8 4.6 - 11 29-69 
 US06195210-1.zmx Zemax 15 4.8 - 8.7 39-73 
 US06157496-3.zmx Zemax 5.7 2.9 - 4.0 6-26 
 US06104432-1.zmx Zemax 0.6 1.6 - 3.0 1-10 folded
 US06014266-1.zmx Zemax 16 5.6 - 8.5 23-67 Obama invention!
 US05867325-1.zmx Zemax 21 7.8 - 10 28-75 Obama invention!
 US05825556-1.zmx Zemax 5 2.8 - 4.0 15-30 
US06754446-1  Zemax 3.3
2.9-3.8
5.6-32
 folded zoom
US06865026-1  Zemax 3.5
2.8-4.5
5.9-12
 folded zoom
US07085070-1  Zemax 2.0
2.7-4.9
3.2-9.7
 folded zoom
US07173768-1  Zemax 3.5
3.8-4.2
6.5-24
 folded zoom
US07193786-1  Zemax 3.6
2.7-4.8
6.5-18.2
 folded zoom
US07215486-1  Zemax 2.0
2.7-4.8
3.2-9.7
 folded zoom
US07218455-1  Zemax 3.4
2.9-5.2
5.5-16
 folded zoom
US07227698-1  Zemax 4.4
3.2-5.2
8.0-37
 folded zoom
US07227706-1  Zemax 3.7
3.7-5.2
6.0-18
 folded zoom
US07274516-1  Zemax 3.6
4.7-7.7
20-40
 folded zoom
US07301576-1  Zemax 1.8
2.8-4.5
3.3-9.5
 folded zoom
US07315423-1  Zemax 4.2
3.6-4.3
7.5-20
 folded zoom
US07339744-1  Zemax 3.6
3.3-6.1
6.5-19
 folded zoom
US07379250-1  Zemax 4.4
2.7-5.1
6.0-17
 folded zoom
US07382548-2  Zemax 4.5
3.6-7.6
5.6-51
 folded zoom
US07411740-1  Zemax 3.6
3.5-5.0
6.6-19
 folded zoom
US07411741-1  Zemax 3.8
3.5-5.0
5.0-17
 folded zoom
US07443599-1  Zemax 2.8
3.2-5.9
4-11
 folded zoom
US07443607-2  Zemax 3.6
5.0
22-66
 folded zoom
US07466495-1  Zemax 3.6
3.6-5.8
6-50
 folded zoom
US07471453-1  Zemax 3.6
2.8-3.6
6-23
 folded zoom
US07486446-1  Zemax 2.0
2.8-4.9
3.2-9.7
 folded zoom
US07515352-1  Zemax 3.8
3.7-4.6
6.5-30
 folded zoom
US07529035-1  Zemax 2.8
3.6-7.0
5-13
 folded zoom
US07567389-1  Zemax 2.8
3.5-6.0
4-18
 folded zoom, telecentric
US07623297-2  Zemax 4.2
3.0-5.9
6-18
 folded zoom
US07626765-1  Zemax 3.5
3.6-4.8
5-15
 folded zoom
US07684117-1  Zemax 3.6
2.9-3.6
6-23
 folded zoom
US07692863-1  Zemax 3.6
2.9-3.6
6-23
 folded zoom
US07782542-1  Zemax 2.0
4.7-4.9
3.2-9.7
 folded zoom
US07800832-1  Zemax 3.6
2.9-6.2
6.0-18
 folded zoom
US07835089-1  Zemax 4.0
4.0-6.0
5.1-24
 folded zoom
US07855841-2  Zemax 2.9
2.7-4.8
4.2-11
 folded zoom
US07911706-1  Zemax 3.7
2.4-5.2
4.7-16
 folded zoom
US07940471-1  Zemax 3.7
2.9-5.6
4.7-13
 folded zoom
US07982966-1  Zemax 3.7
3.4-9.1
4.7-13
 folded zoom
US07986467-1  Zemax 2.2
2.9-5.5
3.7-10
 folded zoom
US08089702-1  Zemax 3.8
3.6-4.8
6.7-22
 folded zoom
US08111467-1  Zemax 3.0
3.6-4.8
4.5-6.6
 folded zoom
US08111467-1  Zemax 3.0
3.6-4.8
4.5-6.6
 folded zoom
US08149515-6  Zemax 3.9
3.1-5.6
6.2-66
 folded zoom
US08218244-2  Zemax 2.8
2.8-5.5
2.7-5.5
 folded zoom
US08243183-1  Zemax 3.8
3.6-5.0
5.0-23
 folded zoom
US08254035-1  Zemax 3.6
3.8-4.5
4.8-22
 folded zoom
US08270090-1  Zemax 3.8
3.6-5.0
5.0-17
 folded zoom
US08279531-1  Zemax 3.8
3.5-6.1
6.0-22
 folded zoom
US08325422-1  Zemax 2.8
3.0-5.9
4.7-13
 folded zoom
US08351129-1  Zemax 3.8
4.1-6.4
5.0-35
 folded zoom
US08369022-1  Zemax 3.0
2.9-5.1
3.8-10.6
 folded zoom
US08427757-1  Zemax 3.8
3.8-6.5
5.0-45
 folded zoom
US08526116-1  Zemax 4.9
4.0-7.0
5.0-45
 folded zoom
 US07068429-1  Zemax  3.5  3.6-4.0  6.3-12.2  folded zoom
 US07079325-1  Zemax  0.65  2.6-5.2  1.0-2.8  folded zoom
 US07417800-2  Zemax  3.6  2.9-5.6
 6.3-15.6  folded zoom
 US07463426-1  Zemax  3.4  2.7-4.7  4.7-17  folded zoom
 US07511898-1  Zemax  0.58  3.2-5.8  1.0-6.9  folded zoom

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