CN104199177B - A kind of wide-angle micro-lens - Google Patents

Abstract

A kind of wide-angle micro-lens, include the first lens group G1 of negative diopter successively to image planes side from object side, second lens group G2 of positive diopter, the part of the 3rd lens G3 groups at least three composition of positive diopter, object is from infinity to when closely moving, the first above-mentioned lens group G1 is fixed, and is expanded by the first lens group G2 and the second lens group G2 interval, and the second lens group G2 and the 3rd lens group G3 interval diminishes to realize focus；The present invention will full following conditional：0.3≤|F1/(F×At)|≤3.0；And with can from it is infinite as far as photography multiplying power be more than more than 0.5 times, small size, low cost, high performance feature.

Description

A kind of wide-angle micro-lens

Technical field

The present invention is a kind of wide-angle micro-lens of the full picture angle more than 60 degree, can be widely used in digital camera mirror Head, especially camera lens, the field such as slr camera camera lens.

Background technology

At present, the picture angle of known micro-lens is all smaller, and draws the photography multiplying power of wide-angle lens of the angle more than 60 degree General all smaller, such as known Japanese Unexamined Patent Publication JP 2007-292978 patents, from object side, by positive or negative The lens set of diopter first, the lens set of positive diopter second and the lens set of negative diopter the 3rd are constituted, and object is from infinity near When distance is mobile, the interval of the first lens set and the second lens set reduces, and relative to the 3rd lens set, to object direction side Move to realize focus.3rd lens set is fixed, although picture angle is very big, but is due to the not enough and each eyeglass of amount of movement of focus group The diopter assignment problem of group, which result in, can not realize larger photography multiplying power.

Also known Japanese Unexamined Patent Publication JP 2009-193052 patents, from object side, by negative diopter first Lens set, the lens set of positive diopter second and the lens set of positive diopter the 3rd are constituted, object from infinity to when closely moving, First group of lens set is fixed, and second group of lens set and the 3rd lens set move to realize focus.Although it is very big to draw angle, also in that The amount of movement of focus group is not enough and the diopter strength assignment problem of each lens set leads to not realize larger photography multiplying power.

The content of the invention

In order to overcome above-mentioned known wide-angle lens can not realize the problem of larger photography multiplying power is not enough, the present invention will be carried As far as photography multiplying power it is more than more than 0.5 times and small volume, inexpensive, high performance wide-angle micro-lens from infinite for one kind.

Technical problem solved by the invention is realized using following technical scheme：A kind of wide-angle micro-lens, from object Side is risen includes the first lens group G1, the second lens group G2 of positive diopter of negative diopter to image planes side successively, positive diopter The part of 3rd lens G3 groups at least three is constituted, and object is from infinity to when closely moving, and the first above-mentioned lens group G1 consolidates It is fixed, expanded by the first lens group G2 and the second lens group G2 interval, and the second lens group G2 and the 3rd lens group G3 Interval diminishes to realize focus；And the wide-angle micro-lens satisfied the following conditional expression.

0.3≤|F1/(F×At)|≤3.0 (1)

Wherein,

F：Under the state of infinity, the focal length of whole optical system.

F1：The focal length of first lens group.

At：Photography enlargement ratio when object is nearest.

As a kind of technical scheme of optimization, the wide-angle micro-lens meets conditional (2)

0.1≤|F1/F2|≤1.0 (2)

Wherein,

F1：The focal length of the first lens group above described.

F2：The focal length of the second lens group above described.

As a kind of technical scheme of optimization, the wide-angle micro-lens meets conditional (3)

1.0≤F/((S2+S3)×At)≤3.5 (3)

Wherein,

S2：Object from infinitely as far as minimum distance when, the amount of movement of the second lens group.

S3：Object from infinitely as far as minimum distance when, the amount of movement of the 3rd lens group.

At：Photography enlargement ratio when object is nearest.

Inventor by largely testing repeatedly, if having been found that the upper limit more than conditional (1), first group of lens it is in the wrong Luminosity is excessively weak, or the focal length of whole optical system is too short, it will be difficult to realize larger photography multiplying power.If it exceeds conditional (1) Lower limit if, although easily realize larger photography multiplying power, but the focal length of whole optical system will be elongated, is difficult to realize larger Photography picture angle, it is impossible to realize the effect of wide-angle microspur.

If it exceeds if the upper limit of conditional (2), the diopter of the first lens group will be too weak, although easily realize wide Angle effect, but to realize that big photography multiplying power is just relatively difficult.If it exceeds if the lower limit of conditional (2), the first lens The diopter of group is too strong, although can be easily achieved miniaturization and larger photography multiplying power, but be due to that the first lens group is bent Luminosity is too strong, may result in aberration, and each aberration such as spherical aberration can not be maked corrections well.

If it exceeds if the upper limit of conditional (3), due to the second lens group and the 3rd lens group focus amount of movement not Foot, realizes that larger photography multiplying power is just relatively difficult.If it exceeds if the lower limit of conditional (3), the second lens group and the 3rd Although the amount of movement of lens group is very sufficient, this optical system will be huge, and low cost, miniaturization would become hard to reality It is existing.

Invention effect

As a result of above structure, the invention has the advantages that：Compared with prior art, the present invention provides one Kind from it is infinite as far as photography multiplying power be more than more than 0.5 times, small size, low cost, high performance wide-angle micro-lens.

Brief description of the drawings

Fig. 1 is the micro-lens index path of first embodiment；

Spherical aberration when Fig. 2 is the micro-lens infinity of first embodiment and maximum photography multiplying power, curvature of field aberration is abnormal Become aberration and ratio chromatism, schematic diagram；

Fig. 3 is the micro-lens index path in second embodiment；

Spherical aberration when Fig. 4 is micro-lens infinity in second embodiment and maximum photography multiplying power, curvature of field aberration is abnormal Become aberration and ratio chromatism, schematic diagram；

Fig. 5 is the micro-lens index path in 3rd embodiment；

Spherical aberration when Fig. 6 is micro-lens infinity in 3rd embodiment and maximum photography multiplying power, curvature of field aberration is abnormal Become aberration and ratio chromatism, schematic diagram.

Embodiment

In order that technological means, creation characteristic, reached purpose and effect that the present invention is realized are easy to understand, tie below Specific embodiment is closed, the present invention is expanded on further.

First embodiment

As shown in figure 1, the micro-lens of first embodiment includes successively from object side, the first lens group of diopter is born G1, the second lens group G2 of positive diopter and the 3rd lens group G3 compositions with positive diopter.

The infinity of first embodiment, spherical aberration during maximum photography multiplying power, curvature of field aberration, distortion aberration and multiplying power Aberration is as shown in Figure 2.

The data of first embodiment are as follows.

R(mm)：The radius of curvature in each face

D(mm)：Each eyeglass interval and lens thickness

Nd：The refractive index of each glass of d lines

Vd：The Abbe number of glass

Focal length：25.00

FNO：8.0

Half draws angle ω：30.6

Second embodiment

As shown in figure 3, the micro-lens of first embodiment includes successively from object side, the first lens group of diopter is born G1, the second lens group G2 of positive diopter and the 3rd lens group G3 compositions with positive diopter.

The infinity of second embodiment, spherical aberration during maximum photography multiplying power, curvature of field aberration, distortion aberration and multiplying power Aberration is as shown in Figure 4.

The data of second embodiment are as follows.

R(mm)：The radius of curvature in each face

D(mm)：Each eyeglass interval and lens thickness

Nd：The refractive index of each glass of d lines

Vd：The Abbe number of glass

Focal length：15.584

FNO：5.7

Half draws angle ω：48.42

3rd embodiment

As shown in figure 5, the micro-lens of first embodiment includes successively from object side, the first lens group of diopter is born G1, the second lens group G2 of positive diopter and the 3rd lens group G3 compositions with positive diopter.

The infinity of 3rd embodiment, spherical aberration during maximum photography multiplying power, curvature of field aberration, distortion aberration and multiplying power Aberration is as shown in Figure 6.

The data of 3rd embodiment are as follows.

R(mm)：The radius of curvature in each face

D(mm)：Each eyeglass interval and lens thickness

Nd：The refractive index of each glass of d lines

Vd：The Abbe number of glass

Focal length：18.00

FNO：8.0

Half draws angle ω：41.04

(conditional conclusive table)

The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its Equivalent thereof.

Claims (3)

1. a kind of wide-angle micro-lens, it is characterised in that：It is saturating to first of image planes side successively including negative diopter from object side Microscope group G1, the second lens group G2 of positive diopter, tri- parts of the 3rd lens group G3 of positive diopter are constituted, the wide-angle Macro Lens Head is from infinity to during zoom, the first above-mentioned lens group G1 is fixed, and passes through the first lens group G1 and the second lens from closely Group G2 interval expands, and the second lens group G2 and the 3rd lens group G3 interval diminishes to realize focus, and meets following Conditional (1)；

0.707≤|F1/(F×At)|≤3.0 (1)

Wherein,

F：The wide-angle micro-lens is under the focus state of infinity, the whole focal length of wide-angle micro-lens；

F1：The focal length of first lens group；

At：Photography enlargement ratio of the wide-angle micro-lens under closely focus state.

2. wide-angle micro-lens according to claim 1, it is characterised in that meet conditional (2)；

0.1≤|F1/F2|≤1.0 (2)

Wherein,

F1：The focal length of the first described lens group；

F2：The focal length of the second described lens group.

3. wide-angle micro-lens according to claim 1 or 2, it is characterised in that meet conditional (3)；

1.0≤F/((S2+S3)×At)≤3.5 (3)

Wherein,

S2：The wide-angle micro-lens from unlimited distance to minimum distance at zoom when, the second lens group G2 amount of movement；

S3：The wide-angle micro-lens from unlimited distance to minimum distance at zoom when, the 3rd lens group G3 amount of movement；

At：Photography enlargement ratio of the wide-angle micro-lens under closely focus state.