CN108761776B - Zoom lens zoom cam optimization method - Google Patents
Zoom lens zoom cam optimization method Download PDFInfo
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- CN108761776B CN108761776B CN201810245377.1A CN201810245377A CN108761776B CN 108761776 B CN108761776 B CN 108761776B CN 201810245377 A CN201810245377 A CN 201810245377A CN 108761776 B CN108761776 B CN 108761776B
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- 238000005457 optimization Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000000571 coke Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
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- 230000005693 optoelectronics Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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Abstract
The invention belongs to the field of photoelectric imaging equipment, and particularly relates to a zoom lens zoom cam optimization method. The method solves the problems of unsmooth zoom lens zoom cam, low zoom precision, low speed, easy blocking and the like, and comprises the following specific steps: 【1】 Designing an optical system; 【2】 Analyzing a cam pressure angle; 【3】 Constructing a piecewise function of the whole cam according to the trend presented by the cam pressure angle; 【4】 And analyzing the focus output precision.
Description
Technical field
The invention belongs to photoelectronic imaging apparatus fields, and in particular to a kind of zoom lens zoom cam optimization method.
Background technique
Optoelectronic device is mainly made of optical lens, detector and peripheral circuit and equipment, and wherein camera lens is its composition
A pith, for lifting means application range, zoom lens using more and more.In the design of zoom lens
In, cam is current or a kind of common zoom, focus adjusting mechanism, so the design of the mechanism is particularly important.
It is explicitly pointed out in zoom lens correlative study theory, the various structure types of zoom lens have certain burnt section
Range, when exceeding the range, it is necessary first to by changing root promise system further expansion coke segment limit, when further exceeding
When the position, it will be unable to realize.Existing lens design suitably changes root by the cooperation of multiple groups (three groups, four groups) linkage form
Point, to solve the contradiction between miniaturization and big zoom ratio, but it is past to change the cam curve of zoom group or compensation group spacing at root point
Toward will appear rapidly revolution cause pressure angle excessive in addition zoom group, the corresponding spacing of compensation group will appear wave variation, most
Design is caused to cannot achieve in the structure eventually.Furthermore it can vary widely changing focal length variations rate at root point, this variation
With the unsmooth unstable decline for also resulting in optical system focal length output accuracy for leading to motor driving force of cam.
Summary of the invention
In order to solve the problems, such as background technique, this patent proposes that a kind of solution zoom lens zoom cam is uneven
It is suitable, zoom precision is low, speed is slow, easily stuck zoom lens zoom Cam Optimization Design method.
The specific technical solution of the present invention is:
The present invention provides a kind of zoom lens zoom cam optimization methods, comprising the following steps:
[1] Optical System Design；
[1.1] focal length, zoom group, the corresponding distance values of compensation group are exported by optical design software；
[1.2] angular displacement of the cam relevant parameter is designed；
[1.3] cam curve of linear distribution is obtained according to step [1.1] and [1.2]；
[2] analysis at cammed compression angle；
The cam curve of linear distribution is analyzed, directly jumps into step if analysis result meets requirement
[4], it is excessively most of that cammed compression angle is found if being unable to satisfy and requiring, and angular displacement of the cam is split on this basis,
It is prepared to enter into step [3] simultaneously；
[3] trend showed according to cammed compression angle carries out piecewise function construction to entire cam, and construction needs to meet
Three conditions:
A, numerical values recited is identical at each section of functional link；
B, differentiation result is identical at each section of functional link；
C, each section of function change rate is similar to cammed compression angular rate of change；
Then piecewise function is connected to the cam curve of one nonlinear Distribution of fitting, then by the convex of nonlinear Distribution
Wheel curve and focal length, zoom group, compensation group are corresponded and are jumped back to the cam curve of step [2] analysis nonlinear Distribution
Whether cammed compression angle meets requirement；
If meeting requirement, go to step [4]；
If being unsatisfactory for requirement, step [3] are jumped back to again if not optimizing leeway and illustrate the problems in the design,
Step [1] need to be jumped back to, optical lens or cam structure are designed again；
[4] focal length output accuracy is analyzed；
Result is directly exported if focal length output accuracy meets requirement；
If focal length output accuracy is unsatisfactory for requirement, need to analyze its Producing reason,
Its reason has two kinds of situations:
Situation one: due to caused by the cam curve of nonlinear Distribution；
Situation two: caused by not being the cam curve of nonlinear Distribution；
For situation one, the cam curve of nonlinear Distribution is advanced optimized, jumps into step [3], optimal way
It is essentially identical, only difference is that being segmented according to focal length output accuracy, and constructed fuction, needed again after construction complete
Enter step [2]；
For situation two, then needs to optimize the number of teeth and the focusing parameter of electric machine of cam canister, after optimization, be wanted as met
It asks, can directly export result.
Further, above-mentioned piecewise function is multiple, and the junction derivative value of piecewise function is equal and functional value is equal, respectively
It can connect into a relatively continuous function between a piecewise function.
Further, when above-mentioned piecewise function segmentation is according to being angular displacement of the cam, the cam pressure at certain rotational angle
Power angle is excessive or too small, can independently be used as one section of piecewise function.
Further, in above-mentioned piecewise function construction process, the corresponding cam of the excessive location segment function of pressure angle turns
The amount that dynamic angle is given when repartitioning is larger, can be with certain limit in order to compensate for the angle of rotation that pressure angle largely occupies excessively
The corresponding rotational angle of fraction of crossing pressure angle reduce.
Further, the starting function of above-mentioned piecewise function is from optical zoom output parameter and cam structure parameter
Lineament.
The invention has the advantages that
The present invention provides a kind of method using cam curve in piecewise function optimization zoom lens, this method can be incited somebody to action
Cammed compression angle largely reduces excessively in zoom lens, and cammed compression angle can also be crossed to fraction increase, become zoom lens
In a certain range, the power that exports is more steady when its movement of motor control, to solve for the variation of cammed compression angle during times
The problems such as zoom precision is low in zoom lens, irregularity, speed are slow, easily stuck.
Detailed description of the invention
Fig. 1 is method flow diagram provided by the present invention；
Fig. 2 is cam Optimal Example of the invention；
Fig. 3 is focal length output accuracy Optimal Example of the invention.
Specific embodiment
Referring to Fig. 1, low, speed that the present invention provides cam irregularity, zoom precision in a kind of design of solution zoom lens
Slowly, easily stuck optimum design method.
Its main flow is as shown in Figure 1:
First step initialization is completed first, that is, completes to carry out optical design, and focal length, zoom are exported by optical design software
Group, the corresponding distance values of compensation group, design provide cam angle relevant parameter, are then carried out according to initial input parameter linear convex
Wheel design.
Secondly completing second step is the analysis to cammed compression angle, is directly jumped into if analysis result meets requirement
4th step is split angular displacement of the cam if being unable to satisfy and requiring, while being prepared to enter into third step.
If constructing and optimizing into third step piecewise function, the trend showed according to corresponding segment pressure angle is needed to carry out
Piecewise function construction, construction identical, (2) each section of function that need to meet numerical values recited at each section of functional link of three conditions (1) at this
Junction differentiation result is identical, and (3) each section of function change rate is similar to cammed compression angular rate of change.Then piecewise function is connected
Get up to form the cam curve of a nonlinear Distribution.Again by the cam curve of the nonlinear Distribution and focal length, zoom group, compensation
Whether the pressure angle that group was corresponded and jumped back to the cam curve of second step analysis nonlinear Distribution meets the requirements.
If being directly entered the 4th step coke precision analysis, whether analysis focal length output accuracy first is met the requirements, if
Meet then directly output as a result, needing to analyze its Producing reason as being unsatisfactory for, in this way because the cam of nonlinear Distribution is bent
Line causes, and can advanced optimize on the original basis to the cam curve of nonlinear Distribution, the basic phase of optimal way
Together, it only difference is that being segmented according to focal length output accuracy, and constructed fuction, needs to reenter after construction complete
Two steps produce bigger effect pressure angle to prevent the function at newly optimization.
If the cam curve optimization of nonlinear Distribution is unable to satisfy the requirement of focal length output accuracy or Producing reason is not
Caused by the cam curve of nonlinear Distribution, then need to optimize the number of teeth and the focusing parameter of electric machine of cam canister, the optimization
Mode will not cause to directly affect to the cam curve of nonlinear Distribution, therefore after completing optimization in this way, if meeting the requirements
Result can directly be exported.
In addition, it is also necessary to which following explanation is made to piecewise function:
Piecewise function be it is multiple, the junction derivative value of piecewise function is equal and functional value is equal, each piecewise function it
Between can connect into a relatively continuous function.
When piecewise function segmentation is according to being angular displacement of the cam, cammed compression angle is excessive at certain rotational angle or mistake
It is small, it can independently be used as one section of piecewise function.
In piecewise function construction process, the excessive corresponding angular displacement of the cam of location segment function of pressure angle is repartitioned
When the amount given it is larger, can be with the too small by pressure angle of certain limit in order to compensate for the angle of rotation that pressure angle largely occupies excessively
The corresponding rotational angle in part reduces.
The starting function of piecewise function derives from the lineament of optical zoom output parameter and cam structure parameter.
Specific cam Optimal Example is convex at 2 lower right corner of compensation group as shown in Fig. 2, by taking certain three constituent element optical system as an example
Wheel pressure cornicult so increases (in figure shown in dotted line).To solve this problem, nonlinear optimization is carried out to it, majorized function is divided into
Two sections, first segment still keeps linear increase, and second segment is power exponent growth, and result as shown by the solid line in the drawings, can be seen after optimization
Less to the variation of zoom group, 1 pressure angle of compensation group is increased slightly, and 2 pressure angle smaller part of compensation group increased, and pressure angle is larger
Place is obviously reduced.
Specific focusing accuracy Optimal Example as shown in figure 3, be with certain three constituent element optical system (focal length about 600mm-200mm)
Example, arc of rotation it is a length of 0 when correspond to focal length position, when arc of rotation is a length of maximum, correspondence short focus position.Wherein dotted line is knot before optimization
Fruit, although solid line is after optimizing as a result, short focus focal length output accuracy slightly rises after optimization, under focal length output accuracy is obvious
Drop, and decline about 1 times.
Claims (5)
1. a kind of zoom lens zoom cam optimization method, which comprises the following steps:
[1] Optical System Design；
[1.1] focal length, zoom group, the corresponding distance values of compensation group are exported by optical design software；
[1.2] angular displacement of the cam relevant parameter is designed；
[1.3] cam curve of linear distribution is obtained according to step [1.1] and [1.2]；
[2] analysis at cammed compression angle；
The cam curve of linear distribution is analyzed, directly jumps into step [4] if analysis result meets requirement, such as
Being unable to satisfy requirement, then to find cammed compression angle excessively most of, is split on this basis to angular displacement of the cam, while quasi-
It is standby to enter step [3]；
[3] trend showed according to cammed compression angle carries out piecewise function construction to entire cam, and construction need to meet three
Condition:
A, numerical values recited is identical at each section of functional link；
B, differentiation result is identical at each section of functional link；
C, each section of function change rate is similar to cammed compression angular rate of change；
Then piecewise function is connected to the cam curve of one nonlinear Distribution of fitting, then the cam of nonlinear Distribution is bent
Line and focal length, zoom group, compensation group are corresponded and are jumped back to the cam of the cam curve of step [2] analysis nonlinear Distribution
Whether pressure angle meets requirement；
If meeting requirement, go to step [4]；
If being unsatisfactory for requirement, step [3] are jumped back to again if not optimizing leeway and illustrate the problems in the design, need to jump
It returns step [1], optical lens or cam structure is designed again；
[4] focal length output accuracy is analyzed；
Result is directly exported if focal length output accuracy meets requirement；
If focal length output accuracy is unsatisfactory for requirement, need to analyze its Producing reason,
Its reason has two kinds of situations:
Situation one: due to caused by the cam curve of nonlinear Distribution；
Situation two: caused by not being the cam curve of nonlinear Distribution；
For situation one, the cam curve of nonlinear Distribution is advanced optimized, jumps into step [3], optimal way is basic
It is identical, only difference is that being segmented according to focal length output accuracy, and constructed fuction, need to reenter after construction complete
Step [2]；
For situation two, then need to optimize the number of teeth and the focusing parameter of electric machine of cam canister, after optimization, if meeting the requirements
Result can directly be exported.
2. zoom lens zoom cam optimization method according to claim 1, it is characterised in that:
The piecewise function be it is multiple, the junction derivative value of piecewise function is equal and functional value is equal, each piecewise function it
Between can connect into a relatively continuous function.
3. zoom lens zoom cam optimization method according to claim 1, it is characterised in that:
When piecewise function segmentation is according to being angular displacement of the cam, cammed compression angle is excessive at certain rotational angle or mistake
It is small, it can independently be used as one section of piecewise function.
4. zoom lens zoom cam optimization method according to claim 1, it is characterised in that: the piecewise function construction
In the process, the amount given when the excessive corresponding angular displacement of the cam of location segment function of pressure angle is repartitioned is larger, in order to
The angle of rotation that compensation pressure angle largely occupies excessively can be subtracted with the corresponding rotational angle of fraction of crossing pressure angle of certain limit
It is small.
5. zoom lens zoom cam optimization method according to claim 1, it is characterised in that: the piecewise function rises
Beginning function derives from the lineament of optical zoom output parameter and cam structure parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810245377.1A CN108761776B (en) | 2018-03-23 | 2018-03-23 | Zoom lens zoom cam optimization method |
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| CN201810245377.1A CN108761776B (en) | 2018-03-23 | 2018-03-23 | Zoom lens zoom cam optimization method |
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| CN111650746B (en) * | 2020-05-11 | 2021-10-15 | 中国科学院西安光学精密机械研究所 | Method for improving focusing precision of zoom optical system |
| CN111650711B (en) * | 2020-05-13 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Continuous zooming system adjusting method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4840470A (en) * | 1986-12-27 | 1989-06-20 | Victor Company Of Japan, Ltd. | Drive control of zoom lens in zooming system |
| CN101477583A (en) * | 2008-12-23 | 2009-07-08 | 利达光电股份有限公司 | Computer-aided design method for cam curve of three-component zooming system |
| CN102831284A (en) * | 2012-09-21 | 2012-12-19 | 河南平原光电有限公司 | Optimization design method of zoom cam curve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1195084A (en) * | 1997-09-19 | 1999-04-09 | Sony Corp | Focusing method for zoom lens device |
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- 2018-03-23 CN CN201810245377.1A patent/CN108761776B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4840470A (en) * | 1986-12-27 | 1989-06-20 | Victor Company Of Japan, Ltd. | Drive control of zoom lens in zooming system |
| CN101477583A (en) * | 2008-12-23 | 2009-07-08 | 利达光电股份有限公司 | Computer-aided design method for cam curve of three-component zooming system |
| CN102831284A (en) * | 2012-09-21 | 2012-12-19 | 河南平原光电有限公司 | Optimization design method of zoom cam curve |
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