CN218865460U - Optical lens temperature drift detection device - Google Patents
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- CN218865460U CN218865460U CN202223034385.2U CN202223034385U CN218865460U CN 218865460 U CN218865460 U CN 218865460U CN 202223034385 U CN202223034385 U CN 202223034385U CN 218865460 U CN218865460 U CN 218865460U
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model relates to an optical lens temperature drift detection device, include: the system comprises a lens to be detected and a sensor for imaging; a plate glass assembly configured with a plurality of plate glasses arranged in a manner of increasing or decreasing thickness or refractive index; the plate glass assembly can move between the lens to be tested and the sensor to complete the switching of the plate glass. The utility model discloses, through the flat glass thickness and/or the refracting index parameter before the compensation (before switching) and after the compensation (after switching), can the backstepping camera lens high, microthermal temperature floats the data, can arrange the direct temperature of customer end camera and float the test, the temperature that accurately detects optical lens floats direction and temperature and floats the volume, and easy operation, the realization of being convenient for, low cost, it is high with customer requirement experimental method uniformity, improve and measure the accuracy, and resolution power decision mode is simple and conventional, whether the accessible is unanimous or very close with the limit resolution level after the compensation before shooting standard chart contrast compensation, also can contrast the discernment through image processing software.
Description
Technical Field
The utility model relates to an optical lens detects technical field, concretely relates to optical lens temperature drift detection device.
Background
With the development of digital electronic technology, the market has more and more severe requirements for the application of various lenses, especially in the fields of security monitoring, intelligent transportation, intelligent vehicle-mounted lenses and the like.
In the prior art, due to factors such as regional distribution, seasons, sunshine and the like, the resolution under severe high and low temperature conditions needs to be ensured to be clear, namely, the temperature drift is kept stable in the actual use scene of the lens in the field. The current high-low temperature test method in the industry is to use a high-low temperature box to focus clearly at normal temperature and shoot resolution Chart, and then shoot the resolution Chart under the conditions of high temperature and low temperature to confirm the resolving change condition. In actual operation, the temperature drift direction and the temperature drift amount of the lens at high temperature and low temperature can not be accurately captured, effective support can not be provided for improving the temperature drift of the product, and meanwhile, different chip packaging processes of the client camera and materials are selected and used, and different temperature drift influences can be caused on the lens. Therefore, some devices for confirming the lens temperature drift amount in the market cannot synchronously take account of the specific temperature drift influence of the client camera end, and meanwhile, the cost of the device is very high.
Disclosure of Invention
The utility model provides an optical lens temperature drift detection device, high, microthermal temperature drift data that can the backstep camera lens, the method is simple, detects low cost, and the commonality is high.
According to the utility model discloses an aspect provides an optical lens temperature drift detection device, include:
the system comprises a lens to be detected and a sensor for imaging;
a plate glass assembly configured with a plurality of plate glasses arranged in a manner of increasing or decreasing thickness or refractive index;
the plate glass assembly can move between the lens to be tested and the sensor to complete the switching of the plate glass.
In any one of the above technical solutions, the lens to be measured is provided with a strip-shaped through groove, and the flat glass assembly passes through the strip-shaped through groove.
In any one of the above technical solutions, the plate glass assembly includes a plurality of the plate glasses and mylar sheets, and the plurality of the plate glasses are uniformly arranged on the mylar sheets at intervals.
In any of the above technical solutions, the method further comprises:
the motor, through actuating the rack drive the sheet glass subassembly removes, it includes rack section and fixed section to actuate the rack, the sheet glass subassembly is fixed set up in actuate on the fixed section of rack.
In any of the above technical solutions, the rack segment is provided with a temperature drift scale corresponding to the plate glass.
In any of the above technical solutions, the method further includes:
the motor and the sensor are fixed on the substrate;
and the guide block is fixedly arranged on the substrate and penetrates through the guide groove of the actuating rack.
In any of the above technical solutions, the sensor is fixed on the substrate by an AA dispensing or locking screw.
In any of the above technical solutions, the method further includes:
the guide block is fixed on the first limiting block through a locking screw, and a bulge used for limiting the vertical position of the actuating rack is arranged at the lower end of the first limiting block;
the second stopper set up in the other end of actuating the rack, the upper surface of the bulge of first stopper with the upper surface of second stopper is on the coplanar.
In any of the above technical solutions, the plate glass assembly includes a plurality of the plate glasses and mylar sheets, and the plurality of the plate glasses are uniformly arranged on the mylar sheets at intervals.
The utility model discloses an optical lens temperature drift detection device, plate glass sets up between the camera lens that awaits measuring and sensor, through adjusting burnt adjustment behind the lens of plate glass thickness or refracting index realization, and then realize high, the reverse compensation of lens temperature drift under the low temperature, plate glass thickness or refracting index parameter before through the compensation after with the compensation, can the back-push lens high, microthermal temperature drift data, the method is simple, detect low cost, the commonality is high, client camera that can arrange directly carries out the temperature drift test, the temperature drift direction and the temperature drift volume of accurate detection optical lens, and the resolution power decision mode is simple and conventional, whether the accessible is shot standard chart contrast before the compensation and is unanimous or very close with the limit resolution level after the compensation, also can carry out contrast discernment through image processing software.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 schematically shows a schematic structural diagram of an optical lens temperature drift detection apparatus according to an embodiment of the present invention;
fig. 2 schematically shows an exploded view of an optical lens temperature drift detection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating the movement of the actuation rack in the bar-shaped through groove of the optical lens temperature drift detection device according to an embodiment of the present invention;
fig. 4 schematically shows a graph of the relationship between the focal point displacement and the OTF modulus of an optical lens according to an embodiment of the present invention in a normal temperature non-temperature-drift state;
fig. 5 is a schematic view of an optical lens according to an embodiment of the present invention at normal temperature without temperature drift;
fig. 6 schematically shows a graph of the relationship between the focal point displacement and the OTF modulus of an optical lens according to an embodiment of the present invention in a negative temperature drift direction;
fig. 7 is a schematic diagram illustrating an optical lens according to an embodiment of the present invention in a state where a temperature drift direction is negative;
fig. 8 schematically shows a graph of the relationship between the focal point displacement and the OTF modulus of an optical lens according to an embodiment of the present invention in a positive temperature drift direction;
fig. 9 is a schematic view illustrating an optical lens according to an embodiment of the present invention in a state where a temperature drift direction is positive;
fig. 10 schematically illustrates a motor-driven actuation rack movement diagram of an actuation rack according to an embodiment of the present invention;
fig. 11 is a schematic diagram showing a scale structure of an actuator rack of an optical lens temperature drift detection apparatus according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 11 is:
1. a lens to be tested; 2. a sensor; 3. a substrate; 4. a motor; 5. a first stopper; 6. a second limiting block; 7. actuating the rack; 8. a flat glass component; 9. a guide block; 10. locking screws, 81 and Mylar films; 82. a plate glass.
Detailed Description
The description of the embodiments of this specification is intended to be taken in conjunction with the accompanying drawings, which are to be considered part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.
As shown in fig. 1 to 11, according to an aspect of the present invention, an optical lens temperature drift detection device, the optical lens temperature drift detection device includes:
a lens 1 to be measured and a sensor 2 for imaging;
a plate glass unit 8 configured with a plurality of plate glasses 82, the plurality of plate glasses 82 being arranged in a manner of increasing or decreasing thickness or refractive index;
the plate glass assembly 8 is movable between the lens 1 to be measured and the sensor 2 to complete the switching of the plate glass 82.
In this embodiment, the flat glass assembly 8 is configured with a plurality of flat glasses 82, the flat glass assembly 8 can move between the lens 1 to be tested and the sensor 2 to complete the switching of the flat glasses 82, the whole lens 1 to be tested, the sensor 2 and the detection device can be directly placed in a high-low temperature box to perform high-low temperature test, the high-low temperature drift data of the lens can be reversely pushed through the thickness or refractive index parameter of the flat glass before compensation (before switching) and after compensation (after switching), the temperature drift test can be directly performed by matching with a client camera, the temperature drift direction and the temperature drift amount of the optical lens can be accurately detected, the operation is simple, the implementation is convenient, the cost is low, the consistency with the experimental method required by a client is high, and the measurement accuracy is improved.
Specifically, when the lens undergoes high and low temperature drift, the back focus of the lens 1 to be measured is changed by changing the thickness and/or the refractive index of the plate glass between the lens 1 to be measured and the sensor 2, so that the temperature drift is compensated, and the lens can be focused clearly at high and low temperatures. The compensation quantity delta D of the switching glass to the back focus of the lens can be obtained by calculation according to Snell's law, and the temperature drift calculation formula is as follows: Δ D = T1 (1-1/nd 1) -T2 (1-1/nd 2), S + Δ D =0, S is the temperature drift, Δ D is the back focus compensation amount, T1 is the sheet glass thickness before compensation, nd1 is the sheet glass refractive index before compensation, T2 is the sheet glass thickness after compensation, and nd2 is the sheet glass refractive index after compensation.
In practical use, the temperature drift range and precision can be adjusted according to the thickness of the plate glass replaced by the plate glass and the gradient of the refractive index of the plate glass, the temperature drift detection requirements of most lenses can be met, and the universality is high.
In an embodiment of the present invention, preferably, the lens 1 to be measured is configured with a bar-shaped through groove, and the plate glass assembly 8 passes through the bar-shaped through groove.
In this embodiment, the monitoring lens is generally provided with a strip-shaped through groove, the strip-shaped through groove is located between the lens 1 to be measured and the sensor 2, the plate glass assembly 8 passes through the strip-shaped through groove and moves in the strip-shaped through groove, and the strip-shaped through groove has a guiding effect on the plate glass assembly 8.
Wherein, according to the size of the lens 1 that awaits measuring, the bar leads to the groove and has different sizes, and in the same way, dispose multiple size's sheet glass 82, through setting up the rack 7 and the adaptation of sheet glass subassembly 8 and the bar through groove of actuating of multiple size promptly.
It is worth pointing out in particular that, for a monitoring lens, an ICR slot is usually configured, and the ICR slot can be directly used as a strip-shaped through slot. Lenses that are not provided with ICR grooves may be provided with other forms of components for holding lenses with through grooves in the form of bars.
In an embodiment of the present invention, preferably, the plate glass assembly 8 comprises a plurality of plate glasses 82 and mylar sheets 81, and the plurality of plate glasses 82 are uniformly spaced on the mylar sheets 81.
As shown in fig. 10, in an embodiment of the present invention, preferably, the present invention further includes:
the motor 4, through actuating 7 drive flat glass subassembly of rack 8 and removing, actuate rack 7 and include rack section and fixed segment, flat glass subassembly 8 is fixed to be set up on the fixed segment that actuates rack 7.
In this embodiment, the output of the motor 4 is provided with force-exerting teeth or a toothed wheel which mesh with the rack segments of the actuating rack 7.
In the using process, when the temperature of the lens is drifted due to high and low temperatures, the resolution is reduced, the motor 4 can be driven instantly, different plate glasses 82 can be switched, which grade of glass can recover the resolution of the lens is confirmed, and then the temperature drift direction and the temperature drift amount of the lens at the high and low temperatures are directly converted according to the difference of the glass.
As shown in fig. 11, in an embodiment of the present invention, the rack segment is provided with a temperature drift scale corresponding to the plate glass.
In this embodiment, the rack segment is provided with a temperature drift scale corresponding to the plate glass 82, the motor 4 drives the plate glass assembly 8 to move in the process of driving the actuating rack 7 to move, the plate glass on the plate glass assembly 8 corresponds to the temperature drift scale, and the temperature drift scale can directly read the corresponding temperature drift amount, so that the temperature drift direction and the temperature drift amount can be obtained more intuitively in the detection process.
In an embodiment of the present invention, preferably, further comprising:
the substrate 3, the motor 4 and the sensor 2 are fixed on the substrate 3;
and a guide block 9 fixedly arranged on the substrate 3 and passing through the guide groove of the actuating rack 7.
In this embodiment, through configuration guide block 9, can spacing actuate rack 7 and keep horizontal migration, guarantee to actuate the controllability of rack 7 moving direction and read the accuracy of temperature drift, be fixed in base plate 3 with parts such as motor 4, sensor 2 for detect the precision and improve, be favorable to satisfying customer's in-service use demand.
The sensor 2 is fixed to the substrate 3 by means of AA dispensing or locking screws 10.
In an embodiment of the present invention, preferably, further comprising:
the first limiting block 5 is arranged at one end of the actuating rack 7, the guide block 9 is fixed on the first limiting block 5 through a locking screw 10, and a bulge used for limiting the vertical direction position of the actuating rack 7 is arranged at the lower end of the first limiting block 5;
the second stopper 6 is disposed at the other end of the actuating rack 7, and the upper surface of the protruding portion of the first stopper 5 and the upper surface of the second stopper 6 are on the same plane.
In this embodiment, the guide block 9 is fixed in the first stopper 5 through the locking screw 10, the scale pointed by the locking screw 10 corresponds to the plate glass 82 on the plate glass assembly 8, the guide block 9 is fixed at the first stopper 5, the spacing rack 7 of actuating is avoided actuating the rack 7 and is fallen off, the stability of the device is ensured, the first stopper 5 and the second stopper 6 are fixed on the substrate 3, and the upper surface of the protruding part of the first stopper 5 and the upper surface of the second stopper 6 are on the same plane.
In one embodiment of the present invention, preferably, the plate glass assembly 8 comprises a plurality of plate glasses 82 and mylar sheets 81, and the plurality of plate glasses 82 are uniformly spaced on the mylar sheets 81.
In this embodiment, the mylar sheet 81 is used for mounting the plate glass 82, and the mylar sheet 81 mounted with the plate glass 82 is fixed in the groove of the actuating rack 7, which is beneficial to fixing the plate glass 82 and facilitating mounting; the plurality of pieces of plate glass 82 are arranged in a mode of increasing or decreasing the thickness or the refractive index, and the temperature drift direction can be accurately judged.
According to another aspect of the invention, an optical lens temperature drift detection method comprises the following steps:
compensating the temperature drift by changing the thickness of the plate glass and/or the refractive index of the plate glass between the lens 1 to be measured and the sensor 2;
and calculating the temperature drift according to the thickness of the flat glass and/or the refractive index parameter of the flat glass before and after compensation.
In this embodiment, the plate glass is arranged between the lens 1 to be tested and the sensor 2, the adjustment of the back focus of the lens is realized by adjusting the thickness or the refractive index of the plate glass, so that the reverse compensation of the temperature drift of the lens at high and low temperatures is realized, the high and low temperature drift data of the lens can be reversely deduced by the thickness and/or the refractive index parameters of the plate glass before and after the compensation, the method is simple, the detection cost is low, the universality is high, the temperature drift test can be directly carried out by matching with a client camera, and the temperature drift direction and the temperature drift amount of the optical lens are accurately detected.
Specifically, when the lens undergoes high and low temperature drift, the back focus of the lens 1 to be measured is changed by changing the thickness of the flat glass and the refractive index of the flat glass between the lens 1 to be measured and the sensor 2, so that the temperature drift is compensated, and the lens can be focused clearly at high and low temperatures.
Multiple pieces of sheet glass of different thickness or refractive index are but one implementation and may be implemented using other equivalent optical materials or methods, such as multiple pieces of polymer of different thickness or refractive index, or a piece of optical material of graded thickness or graded refractive index.
The utility model discloses an in the embodiment, preferably, burnt offset Δ D can be derived according to snell's law after switching glass is to the camera lens, and the temperature drift computational formula is:
ΔD＝T1*(1-1/nd1)-T2*(1-1/nd2)，
S+ΔD＝0，
wherein S is temperature drift, delta D is compensation amount of back focus, T1 is thickness of the plate glass before compensation, nd1 is refractive index of the plate glass before compensation, T2 is thickness of the plate glass after compensation, and nd2 is refractive index of the plate glass after compensation.
The utility model discloses an optical lens temperature drift detection device's specific use as follows:
And 2, focusing the lens 1 to be detected clearly at normal temperature.
And 3, raising (lowering) the temperature of the high-low temperature box to a high (low) temperature state, and resolving image blur of the lens 1 to be detected due to temperature drift.
And 4, at the moment, the motor 4 moves to actuate the rack 7 and is replaced by thicker (thinner) or plate glass with larger (smaller) refractive index, the plate glass can influence the back focal offset of the lens until the lens is resolved clearly again, and the control mode of the motor is manual control or automatic control of a control system.
And 5, at the moment, the locking screw 10 points to a certain scale position of the actuating rack 7, and the value displayed by the scale position is the temperature drift direction and the temperature drift amount of the lens in the current high (low) temperature state.
And 6, for example, in a high-temperature state, when the temperature of the lens is drifted and the actuating rack 7 is driven to make the resolution clear, the locking screw 10 points to the position of-0.0053. Then the temperature drift direction of the high temperature of the lens is negative, and the temperature drift amount is-0.0053.
Example 1
In this example, 9 sheets of flat glass with the same thickness and increasing refractive index were used for the test, and the specific parameters are shown in table 1 below.
TABLE 1
When there is no temperature drift, the lens focusing state is as shown in fig. 4 and the figure, and the temperature drift S =0. At high (low) temperature, if Δ D >0 is detected, the temperature drift direction of the lens is negative, as shown in fig. 6 and 7, the temperature drift amount S = - Δ D; if Δ D <0 is measured, the temperature drift direction of the lens is positive, as shown in fig. 8 and 9, and the temperature drift amount S = - Δ D.
Combining with Snell's law, the formula for calculating the influence of the thickness and the refractive index of the glass on the deviation of the back focus of the lens is as follows: Δ D = T1 (1-1/nd 1) -T2 (1-1/nd 2), listing one possible glass thickness and refractive index matching scheme. As shown in table 1: the glass No. 5 is a flat glass corresponding to the scale 0, and the material is H-K9L, T1=0.7, and nd1=1.5168. The glass materials are different in other numbers, and for example, the number 2 plate glass material is H-QK3L, T2=0.7, and nd2=1.48749.
The amount of after-scorch effect of glass No. 2 versus glass No. 5 was calculated from the formula Δ D = T1 (1-1/nd 1) -T2 (1-1/nd 2): Δ D =0.0091, and the corresponding temperature drift amount is S = - Δ D = -0.0091.
According to the scheme of table 1, in actual use, the corresponding temperature drift value is marked on the actuating rack 7, and the temperature drift direction and the temperature drift amount can be directly grasped, as shown in fig. 10 and 11.
The utility model discloses an optical lens temperature drift detection device, the switching of sheet glass subassembly portable in order to accomplish sheet glass between camera lens and the sensor awaits measuring, whole camera lens that awaits measuring, sensor and detection device can directly place in the high low temperature case, carry out the high low temperature test, through before the compensation (before switching) with the compensation after (switch the back sheet glass thickness and/or refractive index parameter, can the back thrust the height of camera lens, microthermal temperature drift data, client camera that can arrange directly carries out the temperature drift test, the temperature drift direction and the temperature drift volume of accurate detection optical lens, moreover, the operation is simple, and the device is convenient for realize, therefore, the carrier wave prepaid electric energy meter is low in cost, it is high with customer requirement experimental method uniformity, improve the measuring accuracy, and resolution judge that the mode is simple and conventional, whether the limit resolution level before the contrast compensation of accessible shooting standard chart compares with the compensation is unanimous or very close, also can contrast the discernment through image processing software.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an optical lens temperature drift detection device which characterized in that includes:
the device comprises a lens (1) to be measured and a sensor (2) for imaging;
a flat glass unit (8) configured with a plurality of flat glasses (82), wherein the plurality of flat glasses (82) are arranged in a mode of increasing or decreasing thickness or refractive index;
the plate glass assembly (8) is movable between the lens (1) to be tested and the sensor (2) to complete the switching of the plate glass (82).
2. The optical lens temperature drift detection device according to claim 1, wherein the lens (1) to be detected is provided with a strip-shaped through groove, and the plate glass assembly (8) penetrates through the strip-shaped through groove.
3. The optical lens temperature drift detection device according to claim 1, wherein the plate glass assembly (8) comprises a plurality of plate glasses (82) and Mylar films (81), and the plate glasses (82) are uniformly spaced on the Mylar films (81).
4. The optical lens temperature drift detection device according to claim 1, further comprising:
motor (4), through actuating rack (7) drive sheet glass subassembly (8) remove, it includes rack section and fixed section to actuate rack (7), sheet glass subassembly (8) fixed set up in actuate on the fixed section of rack (7).
5. The optical lens temperature drift detection device according to claim 4, further comprising:
the base plate (3), the said motor (4) and the said sensor (2) are fixed on the said base plate (3);
and the guide block (9) is fixedly arranged on the substrate (3) and penetrates through the guide groove of the actuating rack (7).
6. The optical lens temperature drift detection device according to claim 5, wherein the sensor (2) is fixed on the substrate (3) by an AA dispensing or locking screw (10).
7. The optical lens temperature drift detection device according to claim 4, wherein a temperature drift scale corresponding to the flat glass (82) is configured on the rack segment.
8. The optical lens temperature drift detection device according to claim 5, further comprising:
the first limiting block (5) is arranged at one end of the actuating rack (7), the guide block (9) is fixed on the first limiting block (5) through a locking screw, and a protrusion used for limiting the vertical direction position of the actuating rack (7) is arranged at the lower end of the first limiting block (5);
the second limiting block (6) is arranged at the other end of the actuating rack (7), and the upper surface of the protruding part of the first limiting block (5) and the upper surface of the second limiting block (6) are on the same plane.
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| CN202223034385.2U CN218865460U (en) | 2022-11-15 | 2022-11-15 | Optical lens temperature drift detection device |
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| CN202223034385.2U CN218865460U (en) | 2022-11-15 | 2022-11-15 | Optical lens temperature drift detection device |
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