CN1039122A - Photographic low distortion thin objective - Google Patents
Photographic low distortion thin objective Download PDFInfo
- Publication number
- CN1039122A CN1039122A CN 88104158 CN88104158A CN1039122A CN 1039122 A CN1039122 A CN 1039122A CN 88104158 CN88104158 CN 88104158 CN 88104158 A CN88104158 A CN 88104158A CN 1039122 A CN1039122 A CN 1039122A
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- China
- Prior art keywords
- lens
- photographic
- camera
- camera lens
- low distortion
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- 239000011521 glass Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 5
- 241000219739 Lens Species 0.000 description 52
- 210000000695 crystalline len Anatomy 0.000 description 52
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910052747 lanthanoid Inorganic materials 0.000 description 5
- 150000002602 lanthanoids Chemical class 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 239000005304 optical glass Substances 0.000 description 3
- 241000272173 Calidris Species 0.000 description 1
- 241001415846 Procellariidae Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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Abstract
The invention discloses a kind of photographic low distortion thin objective, it comprises photographic field lens eyeglass one, two, three, it is characterized in that radius r
1=9.117, r
2=23.04, r
3=-28.64, r
4=9.772, r
5=27.17, r
6=-18.75, interval d
1=3.44, d
2=0.73, d
3=0.73, d
4=1.15, d
5=1.6, d
6=1.1, refractive index n e 1.64128,1.62054,1.69514, glass material ZK1.1, F3, Lak2.Advantage of the present invention is: the glass material of employing is inexpensive, and relative aperture is big, and amount of distortion is minimum, and lens length is little, and picture element is good.
Description
The present invention relates to one of camera important component part: photographic field lens
The photograph art is one of people's culture life important content, and the popularity rate of external camera is also quite high, the volume of production and marketing sharp increase of domestic camera in recent years.
Along with the raising of autochromy technology and complete, 135 cameras shared share in camera market has had very big increase.
Because civilian camera production lot is big, in the camera production run, labour productivity plays a part very big to the influence of economic benefit, and " behind the mirror fast in " photographic lens can improve the labour productivity in the photographic lens production run significantly.
" Ke Ke " that f35, F2.8～F4,135 photographic lenss are generally three-chip type be " day plug " (Tessar) camera lens of camera lens and four three groups of formulas (COOK).
The three piece type camera object lens are the simple structure patterns that satisfy focal length and proofread and correct various aberrations, it is the higher order aberrations of optical system of photographic field lens that the decision photographic field lens resembles bad important factor in order of fine quality, the selection of glass material is to reduce higher order aberrations, improves one of important means of photographic field lens image quality.
In general, go up the photographic field lens of grade, for a slice or two expensive group of the lanthanides glass are all adopted in the requirement that reaches image quality, it causes the raising (and have also be difficult to obtain this glass material) of production cost and brings adverse influence to processing technology.
Camera is the product for civilian use, often need carry when particularly using, and " lightly " (in light weight, volume is little) is one of important indicator.
F35 phtographic lens, lens length (first first extremely last a slice second face of optical system) are generally 9～12mm both at home and abroad at present, even it is longer (as domestic " KJ " type camera lens, " petrel " camera lens, " Zhujiang River " board camera lens etc., external Canon camera lens etc.), the last one side of lens wearer to the distance (" rear cut-off distance ") of egative film is generally about 30mm.
Japan Canon company is for obtaining slim 135 phtographic lenses, done very big effort, do not stint the lanthanide optical glass (LaK8 that adopts two high prices, ZLaF2) developing a lens length (first first distance to second of last a slice of eyeglass) is 7.69, f '=33.9, the last one side of eyeglass is to slim 135 phtographic lenses of distance (rear cut-off distance) L '=27.89 of egative film, and the optical transfer function of this camera lens (hereinafter to be referred as " A " camera lens) as shown in Table 2.
The domestic phtographic lens that similar above-mentioned performance can be provided is wished in view of the advantage of the above-mentioned camera lens of Canon company in Hong Kong " Yi Lida optical instrument Manufacturing Co., Ltd ".
We consider: 1. " A " camera lens has adopted two lanthanide optical glass, and material price is too high;
2. main is: these two kinds of group of the lanthanides glass still not can manufacture in that we are domestic;
And these two kinds of relevant performance index of group of the lanthanides glass are all poor.
The purpose of this invention is to provide a kind of mass-produced inexpensive optical glass of domestic energy that is based on and carry out the good aberration balance, all advantages that both kept " A " camera lens have been obtained, having more the little distortion of superiority aspect some other, slim 135 phtographic lenses (hereinafter to be referred as " B " camera lens).
Elaborate below in conjunction with accompanying drawing.
Accompanying drawing is phtographic lens of the present invention (" B " camera lens) structural representation
1. is photographic field lens eyeglass one among the figure;
2. be photographic field lens eyeglass two;
3. be photographic field lens eyeglass three;
4. be the photographic field lens diaphragm.
Relevant data is:
Radius is refractive index n e glass material at interval
r
1＝9.117 d
1＝3.44
1.64128 ZK11
r
2＝23.04 d
2＝0.73
r
3＝-28.64 d
3＝0.73
1.62054 F3
r
4＝9.772 d
4＝1.15
r
5＝27.17 d
5＝1.6
1.69514 LaK2
r
6＝-18.75 d
6＝1.1
Focal distance f '=33.517
Lens length d=7.65
Principal plane locations
F35,135 phtographic lenses
" thin type " camera lens so still loses report at home.
" B " camera lens can be done as table one contrast with the used glass material of " A " camera lens:
" B " camera lens and " A " camera lens relevant data are to such as table two:
In sum, can see that the present invention's 135 phtographic lenses have following advantage:
1. inexpensive, function admirable of the glass material of Cai Yonging and domestic can production in a large number, material cost only is 1/3rd of a Japanese similar camera lens.
2. relative aperture big (F4) surpasses the F4.5 of " A " camera lens, and the phtographic lens range of application is wider.
3. amount of distortion is minimum, only is 1/5th of " A " camera lens, and domestic 135 phtographic lenses still do not have the amount of distortion that reaches so little.
4. the little α of lens length=7.65 are type structure as thin as a wafer.
5. the little L ' of rear cut-off distance L '=27.89 make camera architecture light and handy.
Though 6. be simple three-chip type " Ke Ke " camera lens, resemble of fine quality good, optical transfer function (OTF) as shown in Table 2, the point range figure disperse is less than 0.02, phtographic lens real scene shooting result surpasses 2 grades of camera lens national standards.
7. be " behind-the-lens shutter " structure, can improve the labour productivity that camera is produced.
Claims (1)
1, a kind of photographic low distortion thin objective, it comprises photographic field lens eyeglass one, two, three, it is characterized in that:
Radius is refractive index n e glass material at interval
r
1=9.117 d
1=3.44 1.64128 ZK11
r
2=23.04 d
2=0.73
r
3=-28.64 d
3=0.73 1.62054 F3
r
4=9.772 d
4=1.15
r
5=27.17 d
5=1.6
r
6=-18.75 d
6=1.1 1.69514 L
aK2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104158 CN1009866B (en) | 1988-06-30 | 1988-06-30 | Photographic low distortion thin objective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88104158 CN1009866B (en) | 1988-06-30 | 1988-06-30 | Photographic low distortion thin objective |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1039122A true CN1039122A (en) | 1990-01-24 |
| CN1009866B CN1009866B (en) | 1990-10-03 |
Family
ID=4832888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88104158 Expired CN1009866B (en) | 1988-06-30 | 1988-06-30 | Photographic low distortion thin objective |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009866B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227190A (en) * | 2016-12-21 | 2018-06-29 | 深圳市掌网科技股份有限公司 | A kind of camera lens module |
-
1988
- 1988-06-30 CN CN 88104158 patent/CN1009866B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227190A (en) * | 2016-12-21 | 2018-06-29 | 深圳市掌网科技股份有限公司 | A kind of camera lens module |
| CN108227190B (en) * | 2016-12-21 | 2020-05-01 | 深圳市掌网科技股份有限公司 | Lens module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009866B (en) | 1990-10-03 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |