CN107966798B - Short focus projection objective - Google Patents
Short focus projection objective Download PDFInfo
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- CN107966798B CN107966798B CN201810042916.1A CN201810042916A CN107966798B CN 107966798 B CN107966798 B CN 107966798B CN 201810042916 A CN201810042916 A CN 201810042916A CN 107966798 B CN107966798 B CN 107966798B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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- Optics & Photonics (AREA)
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Abstract
A kind of short focus projection objective successively includes: the first lens group with negative power, the third eyeglass with positive light coke, diaphragm, the third lens group with positive light coke, prism and the imaging surface with solid-state imager from exit end to source ends.The present invention uses least number of lenses, and introducing plastic cement is aspherical, has devised high pixel, small distortion, small color difference, small size, light weight, the short focus projection objective of no temperature drift are suitable for the various complex environments such as -40 DEG C to+80 DEG C similar vehicle-mounted projections and handheld projector.
Description
Technical field
The present invention relates to a kind of technology in optical device field, specifically a kind of short focus projection objective.
Background technique
Existing projection camera lens considers that many practical carryings use because being designed without, such as 1. body
Product is excessive: most of existing projection objective, length and bore are all bigger, cause phase projector's fuselage after design and
Corresponding auxiliary facility when, have to product overall dimensions being all made bigger to cater to its size.Which results in adopt
Portable projector and vehicle-mounted micro projector can not be applied to these projection objectives.2. weight is excessive: previous throwing
Shadow camera lens for achromatism and reduces distortion, and usually by addition number of lenses come improving performance, this virtually improves camera lens
Whole weight is typically only capable to use in fixed occasion, can not flexibly replace use so that the portability of camera lens substantially reduces
Place.3. focal length is long, projection is than big: existing major part camera lens, the number of lenses all remained in previous design is more, and structure is multiple
It is miscellaneous, the too long feature of focal length.Which results in the product projections using these object lens than big, that is to say, that in identical projector distance
When the picture that can project it is smaller.This characteristic also limits the use scope of product, such as with regard to nothing in this small space in compartment
Method uses the projector of this kind of focal length.4. operating temperature range is small: previous projection objective does not often account for disappearing in design
Heat differential, it is highly unstable in the performance of high/low temperature which results in its camera lenses.Due to the object of mechanism material and lens materials itself
Characteristic is managed, the trend of optical path can be had an impact at different temperature, so that focal plane shifts, is generated empty burnt existing
As, it is unclear so as to cause the fuzzy pictures being projected out, influence using.So the work temperature of most of product in existing market
Degree all within the scope of this, can not much adapt to use in extraneous complex environment at 0 to 40 degrees Celsius.In addition, existing product is
Guarantee that camera lens does not generate because of the performance gap that temperature change generates, it will usually a whole set of corresponding cooling system is designed, this
Also small product size and weight are in a disguised form increased.
Summary of the invention
The present invention In view of the above shortcomings of the prior art, proposes a kind of short focus projection objective, using least eyeglass
Quantity, it is aspherical to introduce plastic cement, has devised high pixel, small distortion, small color difference, small size, light weight, no temperature drift it is short
Out-of-focus projection's object lens are suitable for the various complex environments such as -40 DEG C to+80 DEG C similar vehicle-mounted projections and handheld projector.
The present invention is achieved by the following technical solutions:
The present invention successively includes: the first lens group with negative power from exit end to source ends, has positive light coke
Third eyeglass, diaphragm, the third lens group with positive light coke, prism and the imaging surface with solid-state imager.
The total length of the short focus projection objective and the ratio of effective focal length are (15,20), optic back focal and effectively coke
Away from ratio be (3,5), the ratio of image planes height and effective focal length is (1,1.3).
The ratio of the effective focal length of the focal length and short focus projection objective of first lens group is (- 2.6, -1.2), with
Guarantee control distortion while big field angle.
The ratio of the effective focal length of the focal length and short focus projection objective of the third eyeglass is (3,5), effectively corrects ball
Difference and coma.
The ratio of the effective focal length of the focal length and short focus projection objective of the third lens group is (2.5,3.4), effectively
Correct color difference and the curvature of field.
First lens group includes: the first eyeglass with negative power and the second eyeglass with negative power.
The third lens group, including the 4th eyeglass with positive light coke, the 5th eyeglass with negative power, tool
There are the 6th eyeglass of negative power and the 7th eyeglass with positive light coke.
The focal length of 4th eyeglass and the focal length ratio of the second eyeglass are (- 3.5, -1.5), due to two control temperature
The aspherical proportional coefficient of focal length ratio for spending offset, is able to mutually compensate influence of the temperature change to optical path performance.
The lens index variation with temperature rate of 6th eyeglass and the 7th eyeglass is less than zero.
Technical effect
Compared with prior art, the present invention use athermal design, the aspherical face type of two pieces of plastic cement of reasonable distribution and
Focal power, allow two pieces it is aspherical cancel out each other in temperature changing process to the influence of optical path so that camera lens under high/low temperature not
It is empty burnt, to reach the purpose used in more complex environments.
Detailed description of the invention
Fig. 1 is the semi-cutaway of embodiment 1 and embodiment 2；
Fig. 2 is each aberration diagram of embodiment 1；
Fig. 3 is the light chromaticity difference diagram of embodiment 1；
Fig. 4 is each aberration diagram of embodiment 2；
Fig. 5 is the light chromaticity difference diagram of embodiment 2；
Fig. 6 is the semi-cutaway of embodiment 3；
Fig. 7 is each aberration diagram of embodiment 3；
Fig. 8 is the light chromaticity difference diagram of embodiment 3；
In figure: L1~L7 be the first to the 7th eyeglass, S1~S18 be the first to the 19th lens, diaphragm and prism surface,
STP is diaphragm, P is prism, ICF is optical filter, IMG is image planes, the radius of curvature that " R " is each surface, and is represented aspherical
" paraxial curvature "." D " represents surface spacing, and " Nd " represents the refractive index of d line, and " Vd " represents Abbe number.In addition, object distance
It is one meter.The unit of length measuring is " mm ".
Specific embodiment
Embodiment 1
As shown in Figure 1, the present embodiment includes: including the first eyeglass L1 with negative power and with negative power
The first lens group of two eyeglass L2；Third eyeglass L3 with positive light coke；Including the 4th eyeglass L4, tool with positive light coke
Cemented doublet L5, L6 for being made of the 5th eyeglass of negative power and the 6th eyeglass and the 7th eyeglass L7's with positive light coke
The third lens group.
Wherein the second eyeglass and the 4th eyeglass are aspherical.
Optical property parameter: focal length F=2.8, relative aperture Fno=1.9, TR0.55.
| R | D | Nd | Vd | |
| OBJ | SPHERE | 120 | ||
| 1 | 17.35 | 1 | 1.77 | 49 |
| 2 | 7.97 | 3.1 | ||
| 3 | 24.08 | 1.6 | 1.52 | 56 |
| 4 | 4.55 | 13.3 | ||
| 5 | 17.5 | 5.6 | 1.84 | 23 |
| 6 | -22.5 | 2.0 | ||
| 7 | INF | 0.4 | ||
| 8 | -12.51 | 4.2 | 1.52 | 56 |
| 9 | -8.18 | 0.1 | ||
| 10 | -13.73 | 2.3 | 1.84 | 23 |
| 11 | 8.796 | 2.7 | 1.59 | 67 |
| 12 | -10.73 | 0.1 | ||
| 13 | 16.46 | 2.3 | 1.61 | 63 |
| 14 | -12.54 | 0.7 | ||
| 15 | INF | 10.00 | 1.74 | 37 |
| 16 | INF | 0.50 | ||
| 17 | INF | 0.70 | 1.52 | 60 |
| 18 | INF | 0.30 | ||
| IMG |
The image side surface S11 of 5th eyeglass is the object side of the 6th eyeglass.
The second eyeglass L2 and the 4th eyeglass L4 is non-spherical lens, the wherein aspherical expression of non-spherical lens in the present embodiment
FormulaWherein: c is the inverse of radius of curvature, and h is
Lens side is to the height of optical axis, and k is circular cone coefficient, and A, B, C, D and E respectively represent order aspherical coefficients.
The present embodiment asphericity coefficient is listed in the table below:
As shown in Fig. 2, being each aberration diagram of embodiment 1, including axial chromatic aberration, the curvature of field and distortion.It can be seen from the figure that should
The axial chromatic aberration of tri- color of camera lens RGB has obtained good correction, and the clear projection of picture may be implemented；Field curve can be seen
Out, T line and S line have good convergence, and the curvature of field and astigmatism are very outstanding, guarantee that uniform requirement is imaged in entire picture；It is abnormal
Varied curve finds out that very well, optical distortion is within 1% for lens distortion control.Fig. 3 is light chromaticity difference diagram, as shown, this implementation
Example has carried out good amendment to the ratio chromatism, and coma of tri- color of RGB, meets high pixel projection requirement.
Embodiment 2
As shown in Figure 1, be the half-sectional structure of the present embodiment, compared with Example 1, difference in this case is that Fno is smaller,
TR is larger.
Optical property parameter: focal length F=3, relative aperture Fno=1.7, TR0.6.
The present embodiment asphericity coefficient is listed in the table below:
| #3 | #4 | #8 | #9 | |
| K | 0 | -0.1760832 | -53.254 | -0.548977 |
| A | 0.5 | 0.0013645 | -0.0045063 | 0.00099656 |
| B | -3.31E-05 | -9.08E-06 | 0.00064336 | 2.15E-02 |
| C | 6.37E-07 | -1.04E-06 | -5.47E-05 | 2.35E-07 |
| D | -6.16E-09 | 3.20E-08 | 5.54E-06 | 7.12E-08 |
| E | 2.64E-11 | -3.56E-10 | 0 | 0 |
As shown in figure 4, being each aberration diagram of the present embodiment, including axial chromatic aberration, the curvature of field and distortion.It can be seen from the figure that
The axial chromatic aberration of tri- color of camera lens RGB has obtained good correction, and the clear projection of picture may be implemented；Field curve can be seen
Out, T line and S line have good convergence, and the curvature of field and astigmatism are very outstanding, guarantee that uniform requirement is imaged in entire picture；It is abnormal
Varied curve finds out that very well, optical distortion is within 1% for lens distortion control.Fig. 5 is light chromaticity difference diagram, as shown, this implementation
Example has carried out good amendment to the ratio chromatism, and coma of tri- color of RGB, meets high pixel projection requirement.
Embodiment 3
As shown in fig. 6, be the half-sectional structure of the present embodiment, compared with Example 1, the first eyeglass L1 in the present embodiment and the
Four eyeglass L4 are aspherical.
Optical property parameter: focal length F=3, relative aperture Fno=1.5, TR0.6.
The present embodiment asphericity coefficient is listed in the table below:
| #1 | #2 | #8 | #9 | |
| K | 0 | 0 | -55.254 | -0.648977 |
| A | 0.0004 | 0.00039 | -0.0046063 | 0.00069656 |
| B | -2.04E-06 | 1.95E-06 | 0.00052336 | 1.15E-05 |
| C | 8.25E-09 | 3.6E-08 | -5.047E-05 | 2.15E-07 |
| D | 3.02E-013 | -7.3E-10 | 2.28E-06 | 1.252E-08 |
| E | -1.26E-14 | -9.6E-12 | 0 | 0 |
As shown in fig. 7, being each aberration diagram of the present embodiment, including axial chromatic aberration, the curvature of field and distortion.It can be seen from the figure that
The axial chromatic aberration of tri- color of camera lens RGB has obtained good correction, and the clear projection of picture may be implemented；Field curve can be seen
Out, T line and S line have good convergence, and the curvature of field and astigmatism are very outstanding, guarantee that uniform requirement is imaged in entire picture；It is abnormal
Varied curve finds out that very well, optical distortion is within 1% for lens distortion control.Fig. 8 is light chromaticity difference diagram, as shown, this implementation
Example has carried out good amendment to the ratio chromatism, and coma of tri- color of RGB, meets high pixel projection requirement.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (10)
1. a kind of short focus projection objective, which is characterized in that successively include: first with negative power from exit end to source ends
Lens group, the third eyeglass with positive light coke, diaphragm, the third lens group with positive light coke, prism and have solid
The imaging surface of photographing element, in which: the first lens group include: be convex image side with negative power object side be the first recessed mirror
Piece and the second eyeglass with negative power concave-concave, wherein any a piece of for aspherical lens made of plastic cement；
The third lens group, including being that recessed image side surface is the 4th convex eyeglass, has negative light with positive light coke object side
5th eyeglass of focal power concave-concave, the 6th eyeglass with negative power biconvex and with the 7th eyeglass of positive light coke biconvex,
In the 4th eyeglass be plastic cement made of aspherical lens, and the focal length ratio of the focal length of the 4th eyeglass and the second eyeglass for (-
3.5,-1.5)。
2. short focus projection objective according to claim 1, characterized in that the total length of the short focus projection objective with have
The ratio of focal length is imitated as (15,20), the ratio of optic back focal and effective focal length is (3,5), the ratio of image planes height and effective focal length
Value is (1,1.3).
3. short focus projection objective according to claim 1, characterized in that the focal length and short focus of first lens group are thrown
The ratio of the effective focal length of shadow object lens is (- 2.6, -1.2).
4. short focus projection objective according to claim 1, characterized in that the focal length and short focus of the third eyeglass project
The ratio of the effective focal length of object lens is (3,5).
5. short focus projection objective according to claim 1, characterized in that the focal length and short focus of the third lens group are thrown
The ratio of the effective focal length of shadow object lens is (2.5,3.4).
6. short focus projection objective according to claim 1, characterized in that the refraction of the 6th eyeglass and the 7th eyeglass
Rate variation with temperature rate is less than zero.
7. short focus projection objective according to claim 1, characterized in that the aspherical lens, aspherical expression
FormulaWherein: c is the inverse of radius of curvature, and h is
Mirror side is to the height of optical axis, and k is circular cone coefficient, and A, B, C, D and E respectively represent order aspherical coefficients.
8. any short focus projection objective according to claim 1~7, characterized in that the short focus projection objective, tool
Body are as follows:
The object side of first eyeglass is spherical surface, radius of curvature 17.35mm, the first eyeglass with a thickness of 1mm, roll over
Penetrating rate is 1.77, Abbe number 49；The image side surface of first eyeglass be spherical surface, radius of curvature 7.97mm, the first eyeglass
The distance of image side surface to the object side of the second eyeglass is 3.1mm；
The object side of second eyeglass is aspherical, radius of curvature 24.08mm, the second eyeglass with a thickness of 1.6mm,
Its refractive index is 1.52, Abbe number 56；The image side surface of second eyeglass is aspherical, radius of curvature 4.55mm, second
The distance of the image side surface of eyeglass to the object side of third eyeglass is 13.3mm；
The object side of the third eyeglass is spherical surface, radius of curvature 17.5mm, third eyeglass with a thickness of 5.6mm,
Refractive index is 1.84, Abbe number 23；The image side surface of third eyeglass is spherical surface, and radius of curvature is -22.5mm, third eyeglass
Image side surface to diaphragm distance be 2mm；
The diaphragm with a thickness of 0.4mm；
The object side of 4th eyeglass be it is aspherical, radius of curvature be -12.51mm, the 4th eyeglass with a thickness of
4.2mm, refractive index 1.52, Abbe number 56；The image side surface of 4th eyeglass be it is aspherical, radius of curvature be-
The distance of 8.18mm, image side surface to the object side of the 5th eyeglass of the 4th eyeglass are 0.1mm；
The object side of 5th eyeglass is spherical surface, and radius of curvature is -13.73, the 5th eyeglass with a thickness of 2.3mm,
Refractive index is 1.84, Abbe number 23；The image side surface of 5th eyeglass is spherical surface, radius of curvature 8.796；
6th eyeglass with a thickness of 2.7mm, refractive index 1.59, Abbe number 67；The image side surface of 6th eyeglass
For spherical surface, radius of curvature is -10.73, and the distance of image side surface to the object side of the 7th eyeglass of the 6th eyeglass is 0.1mm；
The object side of 7th eyeglass is spherical surface, radius of curvature 16.46mm, the 7th eyeglass with a thickness of 2.3mm,
Refractive index is 1.61, Abbe number 63；The image side surface of 7th eyeglass is spherical surface, and radius of curvature is -12.54mm, the 7th mirror
The distance of the image side surface of piece to prism is 0.7mm；
The prism with a thickness of 10mm, refractive index 1.74, Abbe number 37；The distance of prism to optical filter is
0.5mm；
The optical filter with a thickness of 0.7mm, refractive index 1.52, Abbe number 60；Optical filter to imaging surface away from
From for 0.3mm；
The circular cone coefficient of the object side of second eyeglass is 0, and quadravalence asphericity coefficient is 0.0008, and six ranks are aspherical
Coefficient be -2.31E-05, eight rank asphericity coefficients be 3.64E-07, ten rank asphericity coefficients be -3.17E-09,12
Rank asphericity coefficient is 1.22E-11；The circular cone coefficient of the image side surface of second eyeglass is -1.0760832, the aspherical system of quadravalence
Number is 0.0013645, and six rank asphericity coefficients are -1.08E-05, and eight rank asphericity coefficients are -1.04E-06, ten ranks
Asphericity coefficient is 3.20E-08, and ten second order asphericity coefficients are -3.56E-10；
The circular cone coefficient of the object side of 4th eyeglass be -66.806228, quadravalence asphericity coefficient be -
0.0045063, six rank asphericity coefficients are 0.00064336, and eight rank asphericity coefficients are -7.01E-05, ten rank aspheric
Face coefficient is 3.31E-06, and ten second order asphericity coefficients are 0；The circular cone coefficient of the image side surface of 4th eyeglass be-
0.34275087, quadravalence asphericity coefficient is 0.000699656, and six rank asphericity coefficients are 1.02E-05, and eight ranks are non-
Asphere coefficient is -5.23E-07, and ten rank asphericity coefficients are 1.88E-08, and ten second order asphericity coefficients are 0.
9. any short focus projection objective according to claim 1~7, characterized in that the short focus projection objective, tool
Body are as follows:
The object side of first eyeglass is spherical surface, radius of curvature 15.72mm, the first eyeglass with a thickness of 1mm, roll over
Penetrating rate is 1.69, Abbe number 50；The image side surface of first eyeglass be spherical surface, radius of curvature 7.95mm, the first eyeglass
The distance of image side surface to the object side of the second eyeglass is 3.5mm；
The object side of second eyeglass is aspherical, radius of curvature 21.87mm, the second eyeglass with a thickness of 1.4mm,
Its refractive index is 1.5, Abbe number 56；The image side surface of second eyeglass is aspherical, radius of curvature 4.84mm, the second mirror
The distance of the image side surface of piece to the object side of third eyeglass is 12.44mm；
The object side of the third eyeglass is spherical surface, radius of curvature 23.16mm, third eyeglass with a thickness of 3mm, roll over
Penetrating rate is 1.86, Abbe number 20；The image side surface of third eyeglass is spherical surface, and radius of curvature is -16.86mm, third eyeglass
Image side surface to diaphragm distance be 1.31mm；
The diaphragm with a thickness of 0.4；
The object side of 4th eyeglass be it is aspherical, radius of curvature is -15mm, the 4th eyeglass with a thickness of 3mm, folding
Penetrating rate is 1.56, Abbe number 56；The image side surface of 4th eyeglass be it is aspherical, radius of curvature be -8mm, the 4th eyeglass
The distance of image side surface to the object side of the 5th eyeglass is 0.1mm；
The object side of 5th eyeglass is spherical surface, and radius of curvature is -10, and the 5th lens thickness is 0.6mm, refractive index
It is 1.8, Abbe number 23；The image side surface of 5th eyeglass is spherical surface, radius of curvature 10；
6th eyeglass with a thickness of 3mm, refractive index 1.62, Abbe number 63；The image side surface of 6th eyeglass is
Spherical surface, radius of curvature are -8.32, and the distance of image side surface to the object side of the 7th eyeglass of the 6th eyeglass is 0.1mm；
The object side of 7th eyeglass is spherical surface, radius of curvature 53.14mm, the 7th eyeglass with a thickness of 3mm, roll over
Penetrating rate is 1.63, Abbe number 63；The image side surface of 7th eyeglass is spherical surface, and radius of curvature is -9.94mm, the 7th eyeglass
The distance of image side surface to prism is 0.8mm；
The prism with a thickness of 10, refractive index 1.7, Abbe number 37；The distance of prism to optical filter is 0.5；
The optical filter with a thickness of 0.7, refractive index 1.5, Abbe number 60；Optical filter to imaging surface distance is
0.3；
The circular cone coefficient of the object side of second eyeglass is 0, and quadravalence asphericity coefficient is 0.5, the aspherical system of six ranks
Number is -3.31E-05, and eight rank asphericity coefficients are 6.37E-07, and ten rank asphericity coefficients are -6.16E-09, ten second orders
Asphericity coefficient is 2.64E-11；The circular cone coefficient of the image side surface of second eyeglass is -0.1760832, quadravalence asphericity coefficient
It is 0.0013645, six rank asphericity coefficients are -9.08E-06, and eight rank asphericity coefficients are -1.04E-06, and ten ranks are non-
Asphere coefficient is 3.20E-08, and ten second order asphericity coefficients are -3.56E-10；
The circular cone coefficient of the object side of 4th eyeglass is -53.254, and quadravalence asphericity coefficient is -0.0045063,
Six rank asphericity coefficients are 0.00064336, and eight rank asphericity coefficients are -5.47E-05, and ten rank asphericity coefficients are
5.54E-06, ten second order asphericity coefficients are 0；The circular cone coefficient of the image side surface of 4th eyeglass is -0.548977, and quadravalence is non-
Asphere coefficient is 0.00099656, and six rank asphericity coefficients are 2.15E-02, and eight rank asphericity coefficients are 2.35E-07,
Ten rank asphericity coefficients are 7.12E-08, and ten second order asphericity coefficients are 0.
10. any short focus projection objective according to claim 1~7, characterized in that the short focus projection objective,
Specifically:
The object side of first eyeglass be aspherical, radius of curvature 26.76mm, the first eyeglass with a thickness of
1.68mm, refractive index 1.525, Abbe number 56；The image side surface of first eyeglass be it is aspherical, radius of curvature is
The distance of 8.64mm, image side surface to the object side of the second eyeglass of the first eyeglass are 5.87mm；
The object side of second eyeglass is spherical surface, and radius of curvature is -155.2mm, the second eyeglass with a thickness of 0.8mm,
Its refractive index is 1.77, Abbe number 49；The image side surface of second eyeglass is spherical surface, radius of curvature 7.43mm, the second mirror
The distance of the image side surface of piece to the object side of third eyeglass is 14.27mm；
The object side of the third eyeglass is spherical surface, radius of curvature 11.87mm, third eyeglass with a thickness of 2.93mm,
Its refractive index is 1.86, Abbe number 37；The image side surface of third eyeglass is spherical surface, and radius of curvature is -60.27mm, third
The distance of the image side surface of eyeglass to diaphragm is 4.35mm；
The diaphragm with a thickness of 0.57；
The object side of 4th eyeglass be it is aspherical, radius of curvature be -11.2mm, the 4th eyeglass with a thickness of
4.73mm, refractive index 1.525, Abbe number 56；The image side surface of 4th eyeglass be it is aspherical, radius of curvature be-
The distance of 6.27mm, image side surface to the object side of the 5th eyeglass of the 4th eyeglass are 0.1mm；
The object side of 5th eyeglass is spherical surface, and radius of curvature is -9.96, the 5th eyeglass with a thickness of 0.5mm, folding
Penetrating rate is 1.85, Abbe number 27；The image side surface of 5th eyeglass is spherical surface, radius of curvature 8.58；
6th eyeglass with a thickness of 3.2mm, refractive index 1.59, Abbe number 63；The image side surface of 6th eyeglass
For spherical surface, radius of curvature is -10.03, and the distance of image side surface to the object side of the 7th eyeglass of the 6th eyeglass is 0.1mm；
The object side of 7th eyeglass is spherical surface, radius of curvature 16.52mm, the 7th eyeglass with a thickness of 3.08mm,
Its refractive index is 1.59, Abbe number 63；The image side surface of 7th eyeglass be spherical surface, radius of curvature be -12.41mm, the 7th
The distance of the image side surface of eyeglass to prism is 0.6；
The prism with a thickness of 10, refractive index 1.7, Abbe number 37；The distance of prism to optical filter is
0.5mm；
The optical filter with a thickness of 0.7mm, refractive index 1.5, Abbe number 60；Optical filter to imaging surface distance
For 0.3mm；
The circular cone coefficient of the object side of first eyeglass is 0, and quadravalence asphericity coefficient is 0.0004, and six ranks are aspherical
Coefficient be -2.04E-06, eight rank asphericity coefficients be 8.25E-09, ten rank asphericity coefficients be 3.02E-13,12
Rank asphericity coefficient is -1.26E-14；The circular cone coefficient of the image side surface of first eyeglass is 0, and quadravalence asphericity coefficient is
0.00039, six rank asphericity coefficients are 1.95E-06, and eight rank asphericity coefficients are 3.60E-08, the aspherical system of ten ranks
Number is -7.30E-10, and ten second order asphericity coefficients are -9.60E-12；
The circular cone coefficient of the object side of 4th eyeglass is -55.254, and quadravalence asphericity coefficient is -0.0046063,
Six rank asphericity coefficients are 0.00052336, and eight rank asphericity coefficients are -5.05E-05, and ten rank asphericity coefficients are
2.28E-06, ten second order asphericity coefficients are 0；The circular cone coefficient of the image side surface of 4th eyeglass is -0.648977, and quadravalence is non-
Asphere coefficient is 0.00069656, and six rank asphericity coefficients are 1.15E-05, and eight rank asphericity coefficients are 2.15E-07,
Ten rank asphericity coefficients are 1.25E-08, and ten second order asphericity coefficients are 0.
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