CN102928968A - Small-size portable focusing optical system - Google Patents
Small-size portable focusing optical system Download PDFInfo
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- CN102928968A CN102928968A CN2012104032074A CN201210403207A CN102928968A CN 102928968 A CN102928968 A CN 102928968A CN 2012104032074 A CN2012104032074 A CN 2012104032074A CN 201210403207 A CN201210403207 A CN 201210403207A CN 102928968 A CN102928968 A CN 102928968A
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- lens group
- lens
- zoom
- focal length
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Abstract
The invention discloses a small-size portable focusing optical system, in particular the focusing optical system which is applied to monitoring and photographic systems and is small in size, light in weight, and medium in aperture, and can zoom quickly. The system comprises a first lens group, a second lens group, a third lens group, a fourth lens group, and an optical filter; the distance between every two adjacent lens groups can be adjusted; and the third lens is provided with a diagram. The focusing optical system has the characteristics of small size, light weight and simplicity in operation.
Description
[technical field]
The present invention relates to varifocal optical system, relate in particular to a kind ofly be applied to monitor, the volume of photographic system is little, lightweight, medium aperture, medium-sized or large-scale fast Novel zoom optical system.
[background technology]
The such shortcoming of medium-sized or large-scale zoom lens ubiquity of take a picture at present, security protection being used: 1, lens ratio is less; Physical dimension is larger; 2, during existing zoom lens zoom after regulating zoom, compensation two lens groups, also need focusing/zooming lens or zoom lens group, could become sharply defined image, complicated operation so not only, and take time longer; 3, the existing high camera lens of multiplying power is subjected to mechanics limit in the zoom process, and the zoom blind spot is often arranged, and namely resolution is relatively poor near a certain focal length, and imaging is not too clear; Only have now the minority camera lens, improve in the situation of other side aspect certain sacrificing, such as in order to realize that multiplying power is high, will do volume very greatly, the zoom time will be very long etc.Now also do not overcome the camera lens of above whole shortcomings.So the medium-sized or large-scale zoom lens that popular photograph, security protection used on the market now, in high costs, volume is also larger, and zoom is chronic.The needs such as this has significant limitation in the use, and the multiplying power that can not satisfy the consumer is high, it is hidden to be convenient for carrying, to be convenient to, volume is little, zoom is quick.
The present invention is in order to overcome above shortcoming, and it is little that JP has been sent out a kind of volume, the varifocal optical system that is convenient for carrying, and adopt popular machining eyeglass technique, and final with lower cost, realized the functions such as multiplying power is high, volume is little, zoom is quick.
[summary of the invention]
The present invention seeks to have overcome deficiency of the prior art and provide a kind of volume little, the varifocal optical system that is convenient for carrying.
In order to solve the technical matters of above-mentioned existence, the present invention adopts following technical proposal:
A kind of volume is little, the varifocal optical system that is convenient for carrying, it is characterized in that including adjacent between mutually first lens group, the second lens group, the 3rd lens group and the 4th lens group and the sensitive chip of spacing, be provided with diaphragm at described the 3rd lens group; Described first lens group, the 3rd lens group in the zoom process with respect to the invariant position of sensitive chip; Described the second lens group, the 4th lens group position with respect to sensitive chip in the zoom process is variable.
Aforesaid a kind of volume is little, the varifocal optical system that is convenient for carrying, and the focal length that it is characterized in that described first lens group integral body is being for just, and the focal length of the second lens group integral body is for negative, and the whole focal length of the 3rd lens group and the 4th lens group is all for just.
Aforesaid a kind of volume is little, and the varifocal optical system that is convenient for carrying is characterized in that the first lens focal length of described the second lens group is for negative.
Aforesaid a kind of volume is little, and the varifocal optical system that is convenient for carrying is characterized in that the system element characteristic of described first lens group, the second lens group, the 3rd lens group, the 4th lens group satisfies following formula: f1 〉-f2, f3〉f4.Wherein, f1 is first lens group's combined focal length, and f2 is the combined focal length of the second lens group, and f3 is the combined focal length of the 3rd lens group, and f4 is the combined focal length of the 4th lens group.
The present invention compared with prior art has the following advantages: 1, zoom lens of the present invention can be realized from the low power to the high power and all size of superelevation zoom; The present invention is located at the 3rd lens group to diaphragm, in other conditions under similar circumstances, has greatly dwindled first lens group's volume, reduces widely machine volume.2, zoom lens of the present invention only need be regulated zoom (the second lens group), compensation (the 4th lens group) two lens groups when zoom, just can become sharply defined image.So not only convenient the adjusting also saved the adjusting time greatly.3, zoom lens sharpness of the present invention is high, color is clearly demarcated, and color reducibility is good.4, zoom lens of the present invention does not have the zoom blind spot, all can become sharply defined image in whole zoom process.5, zoom lens of the present invention imaging clearly closely can also become sharply defined image when the 10mm low coverage.6, the design has realized 22 times of optics ZOOM (zoom), and adopt AF (automatically focusing) technology, has thoroughly like this realized that an optical system can be to the photo of the object shooting clear of different distance.
[description of drawings]
Fig. 1 is the synoptic diagram of close shot state of the present invention;
Fig. 2 is the synoptic diagram of distant view state of the present invention;
Fig. 3 is the synoptic diagram of general state of the present invention;
Fig. 4 is diagrammatic cross-section of the present invention.
[embodiment]
Describe the present invention below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of volume is little, the varifocal optical system that is convenient for carrying, include adjacent between mutually first lens group 1, the second lens group 2, the 3rd lens group 3 and the 4th lens group 4 and the sensitive chip 5 of spacing, described first lens group 1, the second lens group 2, the 3rd lens group 3 and the 4th lens group 4 and sensitive chip 5 are successively set in the bearing 6, and described first lens group 1 and the 3rd lens group 3 are fixed on the inwall of bearing 11; Be respectively equipped with a guide rod 15 in the both sides of 6 li of bearings, described the second lens group 2, the 4th lens group 4 are located at respectively on movable stand 13a, the 13b, movable stand 13a, 13b are enclosed within respectively on the guide rod 15 movably, be respectively equipped with the first motor 8 and the second motor 9 with screw rod 6 li of bearings, be provided with nut assembly 14a at described screw rod 7a, 7b is provided with nut assembly 14b at another screw rod, and described nut assembly 14a is fixed on the movable stand 13a, and described nut assembly 14b is fixed on the movable stand 13b.
When the first motor 8 rotates, and nut assembly 14a is fixed on the movable stand 13a, and screw rod 7a will drag the movement of movable stand 13a; With the principle of wanting, screw rod 7b will drag the movement of movable stand 13b.So the second lens group 2 can drag it by the first motor 8 and move horizontally, the 4th lens group 4 can drag it by the second motor 9 and move horizontally, realize that the interval between wherein said first lens group 1 and the second lens group 2 is adjustable, interval between the second lens group 2 and the 3rd lens group 3 is adjustable, interval between the 3rd lens group 3 and the 4th lens group 4 is adjustable, interval between the 4th lens group 4 and the sensitive chip 5 is adjustable, by changing this four variable airspaces, can reach the purpose of the focal length change that makes camera lens.Described sensitive chip 5 can be used for relatively cheap high pixel CMOS chip or CCD chip.
Described first lens group 1 whole focal length reaches the purpose that converges light for just.The whole focal length of the second lens group 2 is for negative, and first lens 6 focal lengths of the second lens group 2 are also for negative, and cluster makes the focal length of whole system change in moving process, reaches the purpose of zoom, is called again the zoom group.At first since diaphragm 12 be located in the middle of the whole system of the 3rd lens group 3 by after the part of (before the direction that light enters is, the position of sensitive chip be after), so both be beneficial to the bore that dwindles the first lens group, be beneficial to again the bore of controlling the 4th lens group 4; Next is that described four group 4 is the compensation group, is again the focusing group, when it moves, when compensating for zoom, has also adjusted rear Jiao, and this has just removed the complex mechanism of establishing for focusing; There is again described the 3rd lens group 3 in the zoom process, to fix with respect to sensor devices (image planes) such as CMOS sensitive film or ccd chips, so diaphragm 12 positions also are fixed, only need the adjustment aperture size, simplified Machine Design greatly like this, improved simultaneously precision and reliability.By above three kinds of reasonably design arrangements, so that volume of the present invention becomes smaller.In the present invention design very reasonable contemplation arrived the aberration that diaphragm (perforate of shutter) position produces, thereby not only reasonable distribution aberration but also make this shutter design can realize mass production.
Described the second lens group 2, the 4th lens group 4 position with respect to sensitive chip 5 in the zoom process is variable, at first described the 4th lens group 4 whole focal length are for just, light through three lens groups in front is converged to image planes, and it is the compensation group, is again the focusing group.In the zoom process, when zoom group moves, the 4th lens group 4 is mobile simultaneously, when the zoom group moves to the precalculated position, the 4th lens group 4 also moves to position pre-set, that make image planes substantially clear (it is the most clear also may to arrive), then by automatically focusing fine setting, make image planes the most clear; Be equivalent to save this step of focusing, reached the purpose of the time that shortens.Have the clear aperture of two hordes all less, displacement is all shorter in zoom and focusing process again, will spend the less time during zoom like this.By above-mentioned two kinds of approach arrangements, so that its zoom can realize fast.
System element characteristic at described first lens group 1, the second lens group 2, the 3rd lens group 3, the 4th lens group 4 satisfies following formula: f1 〉-f2, f3〉f4.Wherein, f1 is first lens group 1 combined focal length, and f2 is the combined focal length of the second lens group 2, and f3 is the combined focal length of the 3rd lens group 3, and f4 is the combined focal length of the 4th lens group 4.By regulating the ratio between f1, f2, f3, the f4, the numerical values recited of adjusting f1, use aspheric surface and increasing and decreasing each group lens number, can design from little multiplying power to large multiplying power to the zoom lens of the various different multiplying of super large multiplying power, different size.
Adopt wide spectrum when having again the present invention to design, and the Theory Solution image force of design image sharpness and color reducibility have been guaranteed far above theoretical desired value.
Burnt after described four group is directly regulated, thus can directly be transferred to best image planes position, and adopt high-precision step motor, this is with regard to the thorough closely problem of the not cleer and peaceful focusing blind spot of imaging of conventional lenses that solved; Product Precision and product reliability have also just been improved so simultaneously.
Owing to also need to consider the function that in structural design, realizes zoom and Autofocus Technology in the design, then must consider the strength of motor and the precision of stepping in the optical design, so the change curve of the second lens group 2 also needs well to consider when machining cam producing feasibility, the variation of the 4th lens group 4 is also as far as possible little, and four groups' focal power needs well coupling equally.
For realizing best image planes effect; the rear portion of optical system also is added with optical filter 10; light enters from optical filter 10; 10 pairs of CMOS/CCD sensitive chips of optical filter have certain protective effect; in order to filter out interference fringe, has good color reducibility when making image color beautiful and sharp keen.
The below lifts the actual design case of one 22 times of zooms
Group's focusing mobile scope:
1, the 2 interval 1mm～20mm of group.
2, the 3 interval 1mm～20mm of group.
3, the 4 interval 1mm～9mm of group.
4 groups and image planes interval 8mm～20mm.
Claims (1)
1. a volume is little, the varifocal optical system that is convenient for carrying, it is characterized in that including adjacent between mutually first lens group (1), the second lens group (2), the 3rd lens group (3) and the 4th lens group (4) and the sensitive chip (5) of spacing, be provided with diaphragm (12) at described the 3rd lens group (3), described first lens group (1), the 3rd lens group (3) in the zoom process with respect to the invariant position of sensitive chip (5); Described the second lens group (2), the 4th lens group (4) are variable with respect to the position of sensitive chip (5) in the zoom process, the whole focal length of described first lens group (1) is for just, the whole focal length of the second lens group (2) is negative, the whole focal length of the 3rd lens group (3) and the 4th lens group (4) is all for just, the system element characteristic of described first lens group (1), the second lens group (2), the 3rd lens group (3), the 4th lens group (4) satisfies following formula: f1 〉-f2, f3〉f4.Wherein, f1 is the combined focal length of first lens group (1), and f2 is the combined focal length of the second lens group (2), and f3 is the combined focal length of the 3rd lens group (3), f4 is the combined focal length of the 4th lens group (4), and the first lens focal length of described the second lens group (2) is for negative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104032074A CN102928968A (en) | 2012-10-20 | 2012-10-20 | Small-size portable focusing optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104032074A CN102928968A (en) | 2012-10-20 | 2012-10-20 | Small-size portable focusing optical system |
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| Publication Number | Publication Date |
|---|---|
| CN102928968A true CN102928968A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104032074A Pending CN102928968A (en) | 2012-10-20 | 2012-10-20 | Small-size portable focusing optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142569A (en) * | 2014-08-19 | 2014-11-12 | 中山联合光电科技有限公司 | Small-size, high-resolution and large-image-surface zoom optical system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040012859A1 (en) * | 2002-07-17 | 2004-01-22 | Pentax Corporation | Zoom lens system |
| US20060119957A1 (en) * | 2004-12-08 | 2006-06-08 | Ching-Chin Wu | Zoom lens |
| JP2006337806A (en) * | 2005-06-03 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Zoom lens |
| CN201032495Y (en) * | 2007-02-01 | 2008-03-05 | 中山联合光电科技有限公司 | High quality minisize optical lens |
| CN201116943Y (en) * | 2007-10-26 | 2008-09-17 | 中山联合光电科技有限公司 | Zooming optical system capable of fast zooming |
-
2012
- 2012-10-20 CN CN2012104032074A patent/CN102928968A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040012859A1 (en) * | 2002-07-17 | 2004-01-22 | Pentax Corporation | Zoom lens system |
| US20060119957A1 (en) * | 2004-12-08 | 2006-06-08 | Ching-Chin Wu | Zoom lens |
| JP2006337806A (en) * | 2005-06-03 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Zoom lens |
| CN201032495Y (en) * | 2007-02-01 | 2008-03-05 | 中山联合光电科技有限公司 | High quality minisize optical lens |
| CN201116943Y (en) * | 2007-10-26 | 2008-09-17 | 中山联合光电科技有限公司 | Zooming optical system capable of fast zooming |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142569A (en) * | 2014-08-19 | 2014-11-12 | 中山联合光电科技有限公司 | Small-size, high-resolution and large-image-surface zoom optical system |
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Application publication date: 20130213 |