CN110673338A - Method for reducing optical axis jumping quantity of zoom lens under high and low temperature - Google Patents
Method for reducing optical axis jumping quantity of zoom lens under high and low temperature Download PDFInfo
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- CN110673338A CN110673338A CN201910985519.2A CN201910985519A CN110673338A CN 110673338 A CN110673338 A CN 110673338A CN 201910985519 A CN201910985519 A CN 201910985519A CN 110673338 A CN110673338 A CN 110673338A
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Abstract
The invention belongs to the technical field of sighting and discloses a method for reducing the optical axis runout of a zoom lens under high and low temperatures, which comprises the following steps: fitting a correlation curve of the focal length of the zoom lens and the rotating step number of the stepping motor; measuring the corresponding optical axis jumping amount of the zoom lens under a plurality of temperatures and a plurality of focal lengths by using the optical axis center of the telephoto end of the zoom lens at normal temperature as a reference through an optical instrument; assuming that the offset changes linearly between adjacent temperatures and between adjacent focal lengths, calculating the offset at any temperature and at any focal length: according to the number of steps of the stepping motor, the focal length value of the current position is calculated, the temperature of the zoom lens is detected in real time, the focal length value and the temperature are combined with an offset measuring method to obtain offset data, the position of an electronic aiming mark of the zoom lens is adjusted according to the offset data, and the optical axis jumping amount of the zoom lens is reduced. The invention reduces the optical axis jumping amount of the zoom lens in the full temperature environment, so that the zoom lens can be used for aiming.
Description
Technical Field
The invention belongs to the technical field of observation and aiming, and particularly relates to a method for reducing the optical axis runout of a zoom lens at high and low temperatures.
Background
With the improvement of processing means and technical level, the zoom lens is more and more commonly used in various products, and the electronic sighting mark generator is more and more mature and can be integrated on a CCD (charge coupled device) or CMOS (complementary metal oxide semiconductor) driving board. However, due to the existence of the optical axis jumping amount, the zoom lens cannot aim at shooting under high and low temperature conditions and in a full zooming process. Therefore, in many cases, the zoom lens can be used only for observation and is difficult to use as aiming. At present, a plurality of lenses are used for field switching, so that the volume of the photoelectric system is increased. With the increasing automation degree of weaponry, unmanned equipment (unmanned fighter plane, unmanned combat tank and the like) is a development trend in the future, and the reduction of the optical axis jump amount of the zoom lens at high and low temperatures becomes very important. And modern wars are increasingly demanding on weapon systems: the zoom lens is required to meet the aiming requirement under any focal length condition, so that the optical axis jumping amount of the zoom lens approaches to zero.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a method for reducing the optical axis runout of a zoom lens at high and low temperatures, which greatly reduces the optical axis runout of the zoom lens in a full temperature environment by means of post compensation, so that the zoom lens can be used for aiming.
The invention provides a method for reducing the optical axis jumping quantity of a zoom lens under high and low temperature, which comprises the following steps:
1) fitting a relevant curve of the focal length of the zoom lens and the rotating step number of the stepping motor: taking a plurality of points in the focal length range of the zoom lens, calculating the mechanical positions of the zoom group and the compensation group corresponding to each point according to the Gaussian theory of the zoom system, and converting the theoretical rotating steps of the stepping motor; calibrating the difference value between the theoretical position and the actual position of the focal point of the zoom lens through an optical instrument to obtain the corrected actual rotating step number of the stepping motor at each focal point position; fitting a relevant curve of the focal length of the zoom lens and the rotating step number of the stepping motor according to the corrected data;
2) measuring the offset of the electronic sighting mark under each temperature condition: measuring the corresponding optical axis jumping amount of the zoom lens at a plurality of temperatures and a plurality of focal lengths, namely the offset of the electronic sighting mark, by using the optical axis center of the telephoto end of the zoom lens at normal temperature as a reference through an optical instrument;
assuming that the offset changes linearly between adjacent temperatures and between adjacent focal lengths, the offset at any temperature and at any focal length is calculated according to the measured offset data by the following method:
if the offset of the temperature p and the focal length h is calculated, the temperature adjacent to the offset is m and n, wherein m is larger than n; focal lengths with measured values adjacent thereto are i and k, i > k; that is, when the temperature is known to be m and the focal length is known to be i, the x variation is xmiWhen the temperature is n and the focal length is i, the x variation is xni(ii) a When the temperature is m and the focal length is k, the x variation is xmkWhen the temperature is n and the focal length is k, the x variation is xnk(ii) a Then the following is estimated from the linear variation relationship:
x is changed by x when the temperature is p and the focal length is ipiComprises the following steps:
xpi＝xni+(xmi-xni)÷(m-n)×(p-n) (1)
x is changed by x when the temperature is p and the focal length is kpkComprises the following steps:
xpk＝xnk+(xmk-xnk)÷(m-n)×(p-n) (2)
x is changed by x when the temperature is p and the focal length is hphComprises the following steps:
xph＝xpk+(xpi-xpk)÷(i-k)×(h-k) (3)
finishing to obtain:
xph＝[xnk+(xmk-xnk)÷(m-n)×(p-n)]+{[xni+(xmi-xni)÷(m-n)×(p-n)]-[xnk+(xmk-xnk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (4)
similarly, when the temperature is p and the focal length is h, the y variation is yphComprises the following steps:
yph＝[ynk+(ymk-ynk)÷(m-n)×(p-n)]+{[yni+(ymi-xni)÷(m-n)×(p-n)]-[ynk+(ymk-ynk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (5)
3) controlling the movement of the electronic sighting mark: calculating a focal length value of the current position by combining the curve obtained in the step 1) according to the rotating steps of the stepping motor, detecting the temperature of the zoom lens in real time, combining the focal length value and the temperature with the offset measuring method in the step 2) to obtain offset data corresponding to the temperature and the focal length value, adjusting the position of an electronic aiming mark of the zoom lens according to the offset data, and reducing the optical axis jumping amount of the zoom lens.
According to the present invention, in step 1), several points, such as 20mm, 40mm, 70mm, etc., are taken within the focal length range of the lens according to the actual use condition of the zoom lens. The mechanical positions of the zoom group and the compensation group corresponding to each focal length are calculated by adopting the gaussian theory of the zoom system, which belongs to the conventional method in the field and is not described herein.
In the invention, the position of the lens focus is calibrated by adopting a conventional optical instrument, and the optical axis jumping quantity of the zoom lens is measured. Preferably, the optical instrument comprises a collimator.
According to the invention, in step 2), the temperatures are temperature values uniformly selected in the using temperature range of the zoom lens.
In order to ensure the calculation accuracy of the offset amount, it is preferable that the number of the plurality of temperatures is 10 or more.
In the invention, the plurality of focal lengths are a plurality of focal length values which are uniformly selected in the focal length range of the zoom lens.
In order to ensure the calculation accuracy of the offset amount, it is preferable that the number of the plurality of focal lengths is equal to or greater than 5.
Preferably, the movement of the electronic sighting mark is adjusted through a control system, and the control system obtains the offset of the electronic sighting mark according to the curve obtained in the step 1), the offset data measured in the step 2), the calculation method of the unmeasured offset, the real-time temperature of the zoom lens and the rotation step number of the stepping motor, so as to adjust the movement of the electronic sighting mark. The invention provides various parameters and methods to be input into a control system to realize the adjusting function of the control system, and can be realized by the technical personnel in the field according to the needs of the input modes of the various parameters and methods, belonging to the conventional technical means.
Preferably, the real-time temperature of the zoom lens is measured by a temperature sensor attached to the zoom lens, and the temperature signal is transmitted to the control system.
The process parameters not defined in the present invention are carried out in a conventional manner in the art.
The method can realize the position adjustment of the electronic aiming mark of the zoom lens, ensure that the center of the electronic division is consistent with the optical axis center of the long focus position of the product at normal temperature, reduce the optical axis jumping amount of the zoom lens, lead the optical axis jumping amount of the zoom lens to approach to zero, and lead the zoom lens to meet the aiming requirement under the conditions of any temperature and any focal length.
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FIG. 1: the invention discloses a schematic diagram of a method for reducing the optical axis jumping quantity of a zoom lens at high and low temperatures.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The embodiment describes the present invention with a 9-fold zoom lens having a focal length range of 10mm to 90mm as an example, and compared with other types of zoom lenses, the present invention employs a completely new optical axis run-out reduction method.
According to the Gaussian theory of the zoom system, calculating the mechanical position of the focus of the zoom lens, and converting the theoretical rotation steps of the stepping motor; when the focal length of the zoom lens is calibrated to be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm and 80mm through the collimator, the actual rotating steps of the zoom lens under each focal length are calibrated, specific data are shown in table 1, and according to the obtained data, a change curve of the lens revolution number b and the focal length a can be obtained, wherein the change curve is the change curve
b＝{-0.0011[(a-13.417)/1.5833]^2+0.625[(a-13.417)/1.5833]+9.31}/30。
TABLE 1
| Focal length (mm) | Theoretical number of revolutions | Actual number of revolutions |
| 20 | 57 | 58 |
| 30 | 83 | 84 |
| 40 | 104 | 106 |
| 50 | 123 | 125 |
| 60 | 137 | 139 |
| 70 | 145 | 146 |
| 80 | 152 | 163 |
The deviation of each other temperature section is determined by measuring the moving amount of the electronic sighting mark of the zoom lens at the focal length of 10mm, 30mm, 50mm, 70mm, 90mm and the temperature of-40 deg.C, -30 deg.C, -20 deg.C, -10 deg.C, -0 deg.C, -10 deg.C, -20 deg.C, -30 deg.C, -40 deg.C, 50 deg.C, with the lens at the focal length position of 90mm at 20 deg.C and the center of the field of view as the reference, and taking the values of these values as 0 at the telephoto end normal temperature (20 deg.C), and the offset corresponding to each of the above focal lengths and temperatures is shown in Table 2.
TABLE 2
Assuming that the offset changes linearly between adjacent temperatures and between adjacent focal lengths, the offset at any temperature and at any focal length is calculated according to the measured offset data by the following method:
if the offset of the temperature p and the focal length h is calculated, the temperature adjacent to the offset is m and n, wherein m is larger than n; focal lengths with measured values adjacent thereto are i and k, i > k; that is, when the temperature is known to be m and the focal length is known to be i, the x variation is xmiWhen the temperature is n and the focal length is i, the x variation is xni(ii) a When the temperature is m and the focal length is k, the x variation is xmkWhen the temperature is n and the focal length is k, the x variation is xnk(ii) a Then the following is estimated from the linear variation relationship:
x is changed by x when the temperature is p and the focal length is ipiComprises the following steps:
xpi＝xni-(xmi-xni)÷(m-n)×(p-n) (1)
x is changed by x when the temperature is p and the focal length is kpkComprises the following steps:
xpk＝xnk+(xmk-xnk)÷(m-n)×(p-n) (2)
x is changed by x when the temperature is p and the focal length is hphComprises the following steps:
xph＝xpk+(xpi-xpk)÷(i-k)×(h-k) (3)
finishing to obtain:
xph＝[xnk+(xmk-xnk)÷(m-n)×(p-n)]+{[xni+(xmi-xni)÷(m-n)×(p-n)]-[xnk+(xmk-xnk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (4)
similarly, when the temperature is p and the focal length is h, the y variation is yphComprises the following steps:
yph＝[ynk+(ymk-ynk)÷(m-n)×(p-n)]+{[yni+(ymi-xni)÷(m-n)×(p-n)]-[ynk+(ymk-ynk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (5)
to find the x offset x at the 20mm focal length at-32 DEG CphFor example, x offset x at 30mm focal length at-30 ℃mkX offset x at 10mm focal length at-30 ℃ ═ 4miX offset x at 30mm focal length at-40 ℃ ═ 4nkX offset x at 10mm focal length at-40 deg.C, 5 ═ cni(ii) 5, obtainable from formula (4),
xph＝[5+(4-5)÷(-30-(-40))×(-32-(-40))]+{[5+(4-5)÷(-30-(-40))×(-32-(-40))]-[5+(4-5)÷(-30-(-40))×(-32-(-40))]}÷(30-10)×(20-10)＝4.2≈4
according to the number of steps of rotation of the stepping motor, a focal length value of the current position is calculated by combining the number of lens revolutions and a focal length change curve, a temperature sensor is additionally arranged on the zoom lens, the temperature of the zoom lens is detected in real time, a temperature signal is sent to an electronic aiming mark generator (a control system) of the zoom lens, the focal length value and the temperature are combined with an offset measuring method to obtain offset data corresponding to the temperature and the focal length value, the position of an electronic aiming mark of the zoom lens is adjusted according to the offset data, and the optical axis jumping amount of the zoom lens is reduced.
For example, when the system is at-40 ℃ and the number of steps of the stepping motor reaches 58 steps, the aiming mark is moved to the position of (x: +5, y: -6) according to the previously arranged database, which means that the position of the aiming mark is at 0 position, and the aiming precision of the product is ensured.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (8)
1. A method for reducing the optical axis jumping quantity of a zoom lens under high and low temperature conditions is characterized by comprising the following steps:
1) fitting a relevant curve of the focal length of the zoom lens and the rotating step number of the stepping motor: taking a plurality of points in the focal length range of the zoom lens, calculating the mechanical positions of the zoom group and the compensation group corresponding to each point according to the Gaussian theory of the zoom system, and converting the theoretical rotating steps of the stepping motor; calibrating the difference value between the theoretical position and the actual position of the focal point of the zoom lens through an optical instrument to obtain the corrected actual rotating step number of the stepping motor at each focal point position; fitting a relevant curve of the focal length of the zoom lens and the rotating step number of the stepping motor according to the corrected data;
2) measuring the offset of the electronic sighting mark under each temperature condition: measuring the corresponding optical axis jumping amount of the zoom lens at a plurality of temperatures and a plurality of focal lengths, namely the offset of the electronic sighting mark, by using the optical axis center of the telephoto end of the zoom lens at normal temperature as a reference through an optical instrument;
assuming that the offset changes linearly between adjacent temperatures and between adjacent focal lengths, the offset at any temperature and at any focal length is calculated according to the measured offset data by the following method:
if the offset of temperature p and focal length h is calculated,the temperatures adjacent thereto having measured values of m and n, m > n; focal lengths with measured values adjacent thereto are i and k, i > k; that is, when the temperature is known to be m and the focal length is known to be i, the x variation is xmiWhen the temperature is n and the focal length is i, the x variation is xni(ii) a When the temperature is m and the focal length is k, the x variation is xmkWhen the temperature is n and the focal length is k, the x variation is xnk(ii) a Then the following is estimated from the linear variation relationship:
x is changed by x when the temperature is p and the focal length is ipiComprises the following steps:
xpi＝xni+(xmi-xni)÷(m-n)×(p-n) (1)
x is changed by x when the temperature is p and the focal length is kpkComprises the following steps:
xpk＝xnk+(xmk-xnk)÷(m-n)×(p-n) (2)
x is changed by x when the temperature is p and the focal length is hphComprises the following steps:
xph＝xpk+(xpi-xpk)÷(i-k)×(h-k) (3)
finishing to obtain:
xph＝[xnk+(xmk-xnk)÷(m-n)×(p-n)]+{[xni+(xmi-xni)÷(m-n)×(p-n)]-[xnk+(xmk-xnk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (4)
similarly, when the temperature is p and the focal length is h, the y variation is yphComprises the following steps:
yph＝[ynk+(ymk-ynk)÷(m-n)×(p-n)]+{[yni+(ymi-xni)÷(m-n)×(p-n)]-[ynk+(ymk-ynk)÷(m-n)×(p-n)]}÷(i-k)×(h-k) (5)
3) controlling the movement of the electronic sighting mark: calculating a focal length value of the current position by combining the curve obtained in the step 1) according to the rotating steps of the stepping motor, detecting the temperature of the zoom lens in real time, combining the focal length value and the temperature with the offset measuring method in the step 2) to obtain offset data corresponding to the temperature and the focal length value, adjusting the position of an electronic aiming mark of the zoom lens according to the offset data, and reducing the optical axis jumping amount of the zoom lens.
2. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 1, wherein: the optical instrument includes a collimator.
3. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 1, wherein: in step 2), the temperatures are temperature values uniformly selected within the use temperature range of the zoom lens.
4. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 3, wherein: the number of the plurality of temperatures is equal to or greater than 10.
5. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 1, wherein: the plurality of focal lengths are a plurality of focal length values which are uniformly selected within the focal length range of the zoom lens.
6. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 5, wherein: the number of the plurality of focal lengths is greater than or equal to 5.
7. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 1, wherein: the movement of the electronic sighting mark is adjusted through a control system, the control system obtains the offset of the electronic sighting mark according to the curve obtained in the step 1), the offset data measured in the step 2), the method for calculating the unmeasured offset, the real-time temperature of the zoom lens and the rotating steps of the stepping motor, and then the movement of the electronic sighting mark is adjusted.
8. The method for reducing the amount of optical axis run-out of a zoom lens at high and low temperatures according to claim 1 or 7, wherein: the real-time temperature of the zoom lens is measured through a temperature sensor additionally arranged on the zoom lens, and the temperature signal is transmitted to the control system.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114299167A (en) * | 2022-03-11 | 2022-04-08 | 杭州灵西机器人智能科技有限公司 | Monocular calibration method, system, device and medium for zoom lens |
| CN114299167B (en) * | 2022-03-11 | 2022-07-26 | 杭州灵西机器人智能科技有限公司 | Monocular calibration method, system, device and medium of zoom lens |
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