CN101546026A - Varifocal optical system having ultra thin type and low cost - Google Patents
Varifocal optical system having ultra thin type and low cost Download PDFInfo
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- CN101546026A CN101546026A CN200810027120A CN200810027120A CN101546026A CN 101546026 A CN101546026 A CN 101546026A CN 200810027120 A CN200810027120 A CN 200810027120A CN 200810027120 A CN200810027120 A CN 200810027120A CN 101546026 A CN101546026 A CN 101546026A
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- lens group
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- eyeglass
- varifocal optical
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Abstract
The invention discloses a varifocal optical system having ultra thin type and low cost, which comprises a light-sensitive chip, a first lens group, a second lens group, a third lens group and a diaphragm, wherein the first lens group is changed relative to the position of the light-sensitive chip in the zooming process; the second lens group is changed relative to the positions of the light-sensitive chip and the first lens group in the zooming process; the third lens group can directly adjust a back focus; and the diaphragm is arranged between the first lens group and the second lens group. The focus of the whole first lens group is negative, the focus of the whole second lens group is positive, and the focus of the whole third lens group is positive. The system has the advantages of small volume, ultra thin type, light weight, medium aperture, popularized technological requirements and the like, and is widely applied in the aspects of cameras and camera mobile phones.
Description
[technical field]
The present invention relates to a kind of varifocal optical system, relate in particular to a kind of small size that is applied to photographic system, ultrathin type, in light weight, medium aperture, popular technological requirement, the varifocal optical system of zoom ratio below 3.6 times cheaply.
[background technology]
The zoom ratio of the zoom lens of the ultrathin digital camera of main flow, mobile phone mainly contains three kinds of structures of traditional through type, group's side shifting type and periscopic below 3.6 times at present, and the shortcoming of these three kinds of structures is as follows:
1. traditional through type: advantage is that technology is comparatively ripe, and shortcoming is that eyeglass group thickness is too big, causes camera lens thickness bigger, is that thickness is the thickest in above-mentioned three kinds of structures.
2. group's side shifting type: advantage is that camera lens thickness is thinner than traditional through type, but because camera lens need come group's sidesway when shrinking, the optical axis of camera lens does not overlap with the center of lens barrel, causes technology difficulty bigger.
3. periscopic: advantage is that thickness is thinner, and to be that aperture is smaller accomplish generally about F3.5 that imaging effect is not as through type to shortcoming.
[summary of the invention]
The present invention seeks to overcome deficiency of the prior art and provide that a kind of low cost, ultra-thin, small size, thin thickness, technology are simple, the varifocal optical system of zoom ratio below 3.6 times.
In order to solve the technical matters of above-mentioned existence, the present invention adopts following technical proposal:
A kind of ultrathin type, varifocal optical system cheaply, it is characterized in that including sensitive chip and
In becoming times process with respect to first lens group of position for changing of sensitive chip;
In becoming times process with respect to second lens group of position for changing of the sensitive chip and first lens group;
Can directly regulate the 3rd burnt lens group of back; Between described first lens group and second lens group, be provided with diaphragm.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply, the focal length that it is characterized in that the described first lens group integral body be for negative, and the focal length of the second lens group integral body is being for just, and the 3rd lens group whole focal length is for just.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply is characterized in that described first lens group is made up of two pieces of eyeglasses, wherein the focal length of first piece of eyeglass for negative, second piece of eyeglass focal length for just.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply is characterized in that described second lens group is made up of three pieces of eyeglasses, wherein the focal length of first piece of eyeglass for just, second piece of eyeglass focal length be for negative.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply, it is characterized in that: the 3rd piece of eyeglass of second lens group adopted non-spherical lens.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply is characterized in that the material of the 3rd piece of eyeglass of described second lens group is plastics.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply, it is characterized in that: second piece of eyeglass of first lens group adopted non-spherical lens.
Aforesaid a kind of ultrathin type, varifocal optical system cheaply, the material that it is characterized in that second piece of eyeglass of first lens group is plastics.
The present invention compared with prior art has following advantage: 1, whole camera lens three arrangement of mirrors groups of the present invention the thickness of totally six pieces of eyeglasses add up only less than 50% of camera lens long-focus, total group thickness of zoom lens is accomplished very thin, less than 125% of sensor devices imaging scope, in the present example, under the occasion of long-focus 15.1mm, sensor devices imaging scope φ 6.1mm, three arrangement of mirrors groups' the thickness that adds up has only 7.5mm, and this thickness only is equivalent to the thickness of first group of traditional through type mirror.2, zoom lens of the present invention does not need as " group's side shifting type " structure a certain set of contact lenses to be moved to beyond the normal optical axis when lens barrel shrinks, and the lens barrel diameter can be done smallerly, is equivalent to reduce the camera lens volume.3, zoom lens of the present invention has only adopted the eyeglass of six small sizes, and wherein two adopted glass lens, reduced weight.4, zoom lens of the present invention has adopted two plastic aspherical element eyeglasses, has avoided use glass aspheric surface, has reduced cost.5, zoom lens of the present invention has adopted the design of through type, has reduced the technology difficulty requirement, just can reach with popular technological level.6, zoom lens aperture of the present invention can be accomplished to be better than the periscopic camera lens below the F2.8.7, zoom lens of the present invention utilizes group 3 to realize the automatic focus function of AF, can both become image clearly from farthest infinite as far as nearest 100mm microspur.
[description of drawings]
Fig. 1 is an explosive view of the present invention;
Fig. 2 is an explosive view of the present invention;
Fig. 3 is system optics figure of the present invention.
[embodiment]
Describe the present invention below in conjunction with accompanying drawing:
As shown in the figure, a kind of ultrathin type, varifocal optical system cheaply include first lens group 1, second lens group 2 and the 3rd lens group 3 and sensitive chip 5, are provided with diaphragm 6 described between described first lens group 1 and second lens group 2; Described first lens group 1, second lens group 2 position with respect to sensitive chip in times process of change changes, and the relative position between first lens group 1, second lens group 2 changes.Diminishing gradually from the relative distance of short focal length to the change procedure of long-focus between first lens group 1, second lens group 2.
The focal length of described first lens group, 1 integral body is for negative, and the focal length of second lens group, 2 integral body is being for just, and the 3rd lens group 3 whole focal length are for just.Described first lens group 1 is made up of two pieces of eyeglasses, wherein the focal length of first piece of eyeglass 11 for negative, second piece of eyeglass 12 focal length for just; Second lens group 2 is made up of three pieces of eyeglasses, wherein the focal length of first piece of eyeglass 21 for just, second piece of eyeglass 22 focal length are for negative; The 3rd lens group 3 is made up of one piece of eyeglass, and whole optical system of the present invention has only adopted the eyeglass of six small sizes, so that its thickness can be accomplished is very thin.
The non-spherical lens that the 3rd piece of eyeglass 23 of second lens group 2 adopted plastic material to make at the 3rd piece of eyeglass 23 employing non-spherical lenses of second lens group 2, then can dwindle the thickness of total group, adopts the plastic material manufacturing also can reduce weight.
The non-spherical lens that second piece of eyeglass 12 of first lens group 1 adopted plastic material to make adopts the plastic material manufacturing to reduce weight equally.
Described first lens group 1, second lens group 2 and the 3rd lens group 3 pass successively directly advance the straight trough 161 of tube 16 and are arranged in the rotary cylinder 17, and described rotary cylinder 17 is arranged in the inner chamber that stationary magazine creel 4 and base 7 be assembled into jointly.Be respectively equipped with first guide groove 171 and second guide groove 172 at rotary cylinder 17 inside surfaces, described first lens group 1 and second lens group 2 are separately fixed on the first group of frame 8 and the second group of frame 9, on first group of frame 8, be provided with first protruding pin 81, on second group of frame 9, be provided with second protruding pin 82; Be provided with the 3rd protruding pin 83 in described rotary cylinder 17 appearances, be provided with the 3rd guide groove 41 at stationary magazine creel 4 inside surfaces.Described first group of frame 8 is connected with first guide groove 171 of rotary cylinder 17 by first protruding pin 81; Described second group of frame 9 is connected with second guide groove 172 of rotary cylinder 17 by second protruding pin 82.
On base 7, also be provided with first motor 14 and second motor 15, when first motor 14 rotates, can drive rotary cylinder 17 and rotate by drive gear set.When rotary cylinder 17 rotated, the first group of frame 8 were connected with first guide groove 171 on the rotary cylinder 17 by first protruding pin 81, so can be subjected to the driving of rotary cylinder 17 rotating forces.When motor 1 rotates, ordering about rotary cylinder 17 by drive gear set rotates, because the 3rd protruding pin on the rotary cylinder 17 is connected with the 3rd guide groove 41 on stationary magazine creel 4 inside surfaces, so when rotary cylinder 17 rotates, move up and down while it can rotate along the direction of axle under the restriction of the 3rd guide groove 41.When rotary cylinder 17 rotates, first group of frame 8 can pass the straight trough 161 that directly advances tube 16 by first protruding pin 81 and be connected with first guide groove 171 of rotary cylinder 17, so can be subjected to the driving of rotary cylinder 17 rotating forces, can not rotate and directly advance tube 16, so cause first group of frame 8 also can not rotate, thereby the rotary driving force of rotary cylinder 17 is converted into axial driving force, ordering about first group of frame 8 moves at axial direction, and the axially-movable of rotary cylinder 17 also can drive simultaneously the axially-movable of first group of frame 8, realizes between wherein said first lens group 1 and second lens group 2 being adjustable at interval.
Same reason, when rotary cylinder 17 rotates, second group of frame 9 can pass the straight trough 161 that directly advances tube 16 by second protruding pin 82 and be connected with second guide groove 172 of rotary cylinder 17, so can be subjected to the driving of rotary cylinder 17 rotating forces, can not rotate and directly advance tube 16, so cause second group of frame 9 also can not rotate, thereby the rotary driving force of rotary cylinder 17 is converted into axial driving force, ordering about second group of frame 9 moves at axial direction, and the axially-movable of rotary cylinder 17 also can drive simultaneously the axially-movable of second group of frame 9, realizes between wherein said first lens group 1 and second lens group 2 and the 3rd lens group 3 being adjustable at interval.By changing three's space interval, 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.
It is burnt that described the 3rd lens group 3 can directly be regulated the back, so can directly be transferred to best image planes position, and the high-precision step motor of second motor, 15 employings, this second motor 15 is used for driving moving up and down of the 3rd lens group 3 and realizes regulating back Jiao, and 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 in optical design, must consider the strength of first motor 14 and the precision of stepping, so the precision at the change curve of processing first guide groove 171 and second guide groove 172 need be than higher, the variation precision of described the 3rd lens group 3 is also than higher, so three groups' focal power needs well to mate the function that could realize zoom and Autofocus Technology equally.
Adopt wide spectrum when the present invention designs, and the theoretical solution image force of design image sharpness and color reducibility have been guaranteed far above theoretical desired value.
For realizing best image planes effect, the rear portion of optical system also is added with optical filter 20, light enters from optical filter 20, and optical filter 20 has good color reducibility in order to filter out the Infrared harmful to imaging when making image color beautiful and sharp keen.
Lift the actual design case of one 3 times of zooms below:
Face numbering type radius R thickness optical material bore quafric curve
OBJ object plane Infinity Infinity 00
1 standard, 18.33413 0.4498775 LAF11 9.056361 0
2 standards 5.283682 1.18465 7.684867 0
3 aspheric surfaces, 6.239463 0.9371132 PC 7.668047-3.014667
4 aspheric surfaces 8.674464 9.935606 7.697058-3.768517
STO diaphragm Infinity-0.3242673 3.072861 0
6 standards, 3.456177 1.368175 ZLAF1 3.116213 0
7 standards-5.455428 0 3.013729 0
8 standards-5.455428 1.205306 ZF4 3.013729 0
9 standards 2.753799 0.1208839 2.706998 0
10 aspheric surfaces, 2.552859 0.4499109 PC 2.739515-1.105736
11 aspheric surfaces 3.119525 2.118263 2.81439 0.1034847
12 standards, 150.8175 1.236054 LAF11 6.989354 0
13 standards-9.153593 2.455511 7.088739 0
14 standard I nfinity, 0.75 K9 5.350188 0
15 standard I nfinity 0.62 5.499471 0
IMA image planes Infinity 6.100 0
SURFACE?DATA?DETAIL：
Face numbering 3: aspheric surface
Parameter is at 2 items: 0
Parameter is at 4 item :-8.644983e-005
Parameter is at 6 item :-3.3279551e-005
Parameter is at 8 item :-2.2030729e-007
Parameter is at 10 item :-2.0964907e-007
Face numbering 4: aspheric surface
Parameter is at 2 items: 0
Parameter is at 4 items :-0.0015563724
Parameter is at 6 item: 2.3116175e-005
Parameter is at 8 item :-6.0885869e-006
Parameter is at 10 item: 4.1293296e-008
Face numbering 10: aspheric surface
Parameter is at 2 items: 0
Parameter is at 4 items :-0.0084091807
Parameter is at 6 item :-1.7586708e-006
Parameter is at 8 items :-0.0063840543
Parameter is at 10 items: 0.0014450004
Face numbering 11: aspheric surface
Parameter is at 2 items: 0
Parameter is at 4 items :-0.0022853657
Parameter is at 6 items :-0.0033930767
Parameter is at 8 items :-0.00450481
Parameter is at 10 items: 0.001393911
Group's focusing moving range:
Interval 1.55mm～10.98mm between 1～2 group
2 groups～image planes are apart from 7.18mm～13.95mm
3 groups～image planes are apart from 3mm～4.5mm.
Claims (8)
1, a kind of ultrathin type, varifocal optical system cheaply, it is characterized in that including sensitive chip (5) and
In becoming times process with respect to first lens group (1) of position for changing of sensitive chip (5);
In becoming times process with respect to second lens group (2) of position into changing of sensitive chip (5) and first lens group (1);
Can directly regulate burnt the 3rd lens group (3) in back; Between described first lens group (1) and second lens group (2), be provided with diaphragm (6).
2, a kind of ultrathin type according to claim 1, varifocal optical system cheaply is characterized in that the whole focal length of described first lens group (1) for negative, and the whole focal length of second lens group (2) is being for just, and the 3rd lens group (3) whole focal length is for just.
3, a kind of ultrathin type according to claim 2, varifocal optical system cheaply is characterized in that described first lens group (1) is made up of two pieces of eyeglasses, wherein the focal length of first piece of eyeglass (11) for negative, second piece of eyeglass (12) focal length for just.
4, a kind of ultrathin type according to claim 2, varifocal optical system cheaply is characterized in that described second lens group (2) is made up of three pieces of eyeglasses, wherein the focal length of first piece of eyeglass (21) for just, second piece of eyeglass (22) focal length is for negative.
5, according to claim 2 or 4 described a kind of ultrathin types, varifocal optical system cheaply, it is characterized in that: the 3rd piece of eyeglass (23) of second lens group (2) adopted non-spherical lens.
6, a kind of ultrathin type according to claim 5, varifocal optical system cheaply is characterized in that the material of the 3rd piece of eyeglass (23) of described second lens group (2) is plastics.
7, a kind of ultrathin type according to claim 3, varifocal optical system cheaply, it is characterized in that: second piece of eyeglass (12) of first lens group (1) adopted non-spherical lens.
8, a kind of ultrathin type according to claim 7, varifocal optical system cheaply is characterized in that the material of second piece of eyeglass (12) of first lens group (1) is plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810027120A CN101546026A (en) | 2008-03-25 | 2008-03-25 | Varifocal optical system having ultra thin type and low cost |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810027120A CN101546026A (en) | 2008-03-25 | 2008-03-25 | Varifocal optical system having ultra thin type and low cost |
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| Publication Number | Publication Date |
|---|---|
| CN101546026A true CN101546026A (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810027120A Pending CN101546026A (en) | 2008-03-25 | 2008-03-25 | Varifocal optical system having ultra thin type and low cost |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053349B (en) * | 2009-11-04 | 2012-09-05 | 台湾东电化股份有限公司 | Miniature optical zoom lens |
| CN108254850A (en) * | 2018-02-09 | 2018-07-06 | 路笃伟 | A kind of Image intake device |
-
2008
- 2008-03-25 CN CN200810027120A patent/CN101546026A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053349B (en) * | 2009-11-04 | 2012-09-05 | 台湾东电化股份有限公司 | Miniature optical zoom lens |
| CN108254850A (en) * | 2018-02-09 | 2018-07-06 | 路笃伟 | A kind of Image intake device |
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Open date: 20090930 |