Lens module testing device

Abstract

The utility model belongs to the technical field of thermal stability of optical systems, and discloses a lens module testing device. The lens module testing device comprises a temperature control tool and a back focal length measuring mechanism. The temperature control tool comprises a fixing seat and a heating piece, the fixing seat comprises a bottom plate used for installing a base of a lens module, and the heating piece is arranged on the bottom plate and used for providing different heating temperatures for the bottom plate so that the bottom plate can simulate the heating temperatures of circuit boards of different cameras. The back focal length measuring mechanism is used for measuring the back focal length of the lens module. The lens module testing device can be used for testing the influence of single temperature change on the back focal length of the lens module, and provides data support for initial design of research and development personnel, so that later targeted structural design and model selection are facilitated, and the influence of temperature on imaging of the lens module is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical system thermal stability technical field especially, relate to a lens module testing arrangement. BACKGROUND

[0002] After a period of time, the circuit board of the image sensor (sensor) in the camera will heat up and transfer heat to the lens module of the camera, making the temperature of the position close to the circuit board of the lens module high and the temperature of the position far away from the circuit board low, and the problem of uneven heating of the lens module occurs, resulting in changes in the back focal length of the lens and thus reducing the picture clarity.

[0003] Since the lens module is installed in the camera, only the change in picture clarity can be seen, and the change in back focal length of the lens module cannot be measured, but there are many factors affecting picture clarity, and it is difficult to help production and research and development personnel accurately understand and control the relationship between the back focal length of the lens module and temperature during production and design and research and development.

[0004] Therefore, a lens module testing arrangement is needed to solve the above technical problems. INVENTION CONTENTS

[0005] The utility model provides a kind of lens module testing arrangement, for testing single temperature change to the influence of the back focal length of lens module, provides data support for the initial design of research and development personnel, so as to targeted structure design selection in later period, to reduce the influence of temperature on the imaging of lens module.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The lens module testing arrangement comprises:

[0008] Temperature control tooling, including fixed seat and heating part, the fixed seat includes the bottom plate for installing the base of lens module, the heating part is set on the bottom plate for providing different heating temperature for the bottom plate, so that the bottom plate can simulate the heating temperature of the circuit board of different cameras;

[0009] Back focal length measuring mechanism for measuring the back focal length of the lens module.

[0010] Optionally, the lens module testing arrangement further comprises a housing having a sealed cavity therein, and the sealed cavity is used for accommodating the temperature control tooling.

[0011] Optionally, the heating part comprises a heating body, a heating wire and a temperature controller, the heating wire is arranged in the heating body, and the temperature controller is connected with the heating wire and used for controlling the heating temperature of the heating wire.

[0012] Optionally, the fixing seat further comprises a cover plate connected to the bottom plate, and the heating element is clamped between the bottom plate and the cover plate.

[0013] Optionally, a middle portion of the bottom plate is provided with a mounting portion detachably connected to the base, the mounting portion is provided with a light passing hole, the light passing hole is oppositely arranged relative to a lens of the lens module, the heating element is provided with a first avoiding hole corresponding to the light passing hole, the cover plate is provided with a second avoiding hole corresponding to the first avoiding hole, and the first avoiding hole and the second avoiding hole are used for allowing the base to pass through.

[0014] Optionally, a plurality of first connecting holes are arranged on the bottom plate along the circumference of the light passing hole, the base is provided with a second connecting hole corresponding to each first connecting hole, and a first connecting element is arranged in each pair of corresponding first connecting hole and second connecting hole to fix the base on the bottom plate.

[0015] Optionally, a plurality of third connecting holes are arranged on the circumference of the bottom plate, the heating element 120 is provided with a fourth connecting hole corresponding to each third connecting hole, the cover plate is provided with a fifth connecting hole corresponding to each fourth connecting hole, and a second connecting element is arranged in each group of corresponding third connecting hole, fourth connecting hole and fifth connecting hole to connect the bottom plate, the heating element and the cover plate together.

[0016] Optionally, a first clamping portion is arranged on the opposite two side walls of the bottom plate, a second clamping portion is arranged on the opposite two side walls of the cover plate, and the second clamping portion is clamped in the corresponding first clamping portion.

[0017] Optionally, one of the first clamping portion and the second clamping portion is an elastic buckle, and the other is a clamping groove, and the clamping groove is clamped with the elastic buckle.

[0018] Optionally, a boss is arranged on the plate surface of the bottom plate away from the heating element, and the boss is used for abutting on a workbench of the back focal length measuring mechanism.

[0019] The utility model discloses beneficial effects:

[0020] The utility model provides a lens module testing arrangement, including temperature control frock and back focal length measuring mechanism. The bottom plate of temperature control frock can simulate the heating temperature of the circuit board of different cameras, and detects the back focal length value of lens module under different temperatures through back focal length measuring mechanism, thereby obtains the relationship between the back focal length change of lens module and temperature, provides data support for the initial design of research and development personnel, makes the design selection of circuit board and lens module can be mutually compensated, mutually offset, to reduce the influence of temperature on the imaging of lens module. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the contents of the embodiments of the present application and these drawings without any creative effort.

[0022] Figure 1 is an assembly drawing of the temperature control tool and the lens module from another perspective provided by the first embodiment of the present application;

[0023] Figure 2 is a structural schematic view of the temperature control tool provided by the first embodiment of the present application;

[0024] Figure 3 is an exploded schematic view of the temperature control tool provided by the first embodiment of the present application;

[0025] Figure 4 is an assembly drawing of the temperature control tool and the lens module from another perspective provided by the first embodiment of the present application;

[0026] Figure 5 is a structural schematic view of the temperature control tool provided by the second embodiment of the present application.

[0027] In the drawings:

[0028] 10, lens module; 11, base; 12, lens;

[0029] 100, temperature control tool; 101, mounting portion; 110, fixing seat; 111, bottom plate; 1111, light passing hole; 1112, first connecting hole; 1113, third connecting hole; 1114, clamping groove; 1115, boss; 112, cover plate; 1121, second avoiding hole; 1122, fifth connecting hole; 1123, elastic buckle; 120, heating element; 121, first avoiding hole; 122, fourth connecting hole. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0031] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can indirectly connect through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0033] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0034] Embodiment one

[0035] The embodiment provides a lens module testing device, which is used for testing the influence of single temperature change on the back focal length of the lens module, provides data support for the initial design of researchers, so that the structure design selection is targeted in the later period, so as to reduce the influence of temperature on the imaging of the lens module.

[0036] Specifically, as shown in the drawing, Figure 1 The lens module 10 includes a temperature control tool 100 and a back focal length measuring mechanism (not shown in the drawing). The temperature control tool 100 includes a fixing seat 110 and a heating piece 120, the fixing seat 110 includes a bottom plate 111 for mounting the base 11 of the lens module 10, and the heating piece 120 is arranged on the bottom plate 111. The heating piece 120 is used for providing different heating temperatures for the bottom plate 111, so that the bottom plate 111 can simulate the heating temperature of the circuit board of different cameras. The back focal length measuring mechanism is used for measuring the back focal length of the lens module 10.

[0037] The lens module testing device provided by the embodiment provides different heating temperatures for the lens module 10 through the bottom plate 111 of the temperature control tool 100, and then detects the back focal length values of the lens module 10 at different temperatures by using the back focal length measuring mechanism, so that the relationship between the back focal length change of the lens module 10 and the temperature can be obtained, data support is provided for the initial design of the researchers, and the design selection of the circuit board and the lens module 10 can be mutually compensated and mutually offset, so as to reduce the influence of temperature on the imaging of the lens module 10.

[0038] Optionally, the back focal length measuring mechanism can be a lens back focal flange distance measuring instrument in the prior art. Since the structure of the instrument is in the prior art, the specific structure will not be described in detail.

[0039] Further, the lens module testing device further comprises a shell (not shown in the figure), and the shell has a sealed cavity for accommodating the temperature control tool 100. The shell is mainly used to simulate the shell of a camera to reduce the influence of the temperature of the external environment on the temperature of the lens module 10.

[0040] Optionally, the shape of the shell can be the same as that of the camera shell.

[0041] Further, as shown in Figure 2 and Figure 3 The heating element 120 comprises a heating main body, a heating wire, and a temperature controller. The heating wire is arranged in the heating main body, and the temperature controller is connected with the heating wire and used for controlling the heating temperature of the heating wire. The heating element 120 has a simple structure and is convenient to process and control.

[0042] The working principle of the heating element 120 is as follows: the temperature controller controls the heating temperature of the heating wire, the heating wire transmits heat to the heating main body, the heating main body heats the bottom plate 111 to the temperature, and then the bottom plate 111 transmits heat to the lens module 10.

[0043] Optionally, the heating main body can have a plate structure.

[0044] It should be noted that the circuit structure for electrically connecting the temperature controller and the heating wire is in the prior art, and the control of the heating temperature of the heating wire through the circuit structure is not within the protection scope of the present application, so the specific structure will not be described in detail.

[0045] Optionally, in a possible embodiment, a temperature sensor can also be arranged on the bottom plate 111 to detect the temperature of the bottom plate 111, so as to ensure the reliability of the temperature environment provided by the bottom plate 111 and avoid inaccurate measurement results caused by damage of the heating element 120.

[0046] Further, continuing to refer to Figure 3The fixing base 110 further comprises a cover plate 112. The heating member 120 is arranged between the bottom plate 111 and the cover plate 112, and the bottom plate 111 and the cover plate 112 are connected to clamp the heating member 120. The heating member 120 is fixed on the bottom plate 111 through the cover plate 112, and the structure is simple and convenient to assemble.

[0047] Optionally, in the embodiment, the middle part of the bottom plate 111 is provided with a mounting portion 101 detachably connected with the base 11, the mounting portion 101 is provided with a light passing hole 1111, the heating member 120 is provided with a first avoiding hole 121 corresponding to the light passing hole 1111, the cover plate 112 is provided with a second avoiding hole 1121 corresponding to the first avoiding hole 121, and the base 11 is arranged in the first avoiding hole 121 and the second avoiding hole 1121. The detachable connection of the base 11 and the mounting portion 101 enables the lens module testing device to test lens modules of different models, and the universality is high.

[0048] It is worth noting that when the lens module 10 is installed, the light passing hole 1111 should correspond to the lens of the lens module 10, so as to facilitate the measurement of the back focal length.

[0049] Optionally, continuing to refer to Figure 3 In the embodiment, a plurality of first connecting holes 1112 are arranged on the bottom plate 111 along the circumference of the light passing hole 1111, and the base 11 is provided with a second connecting hole corresponding to each first connecting hole 1112. A first connecting piece (not shown in the figure) is arranged in each pair of corresponding first connecting holes 1112 and second connecting holes, so as to fix the base 11 on the bottom plate 111. The installation of the lens module 10 on the bottom plate 111 is realized through the cooperation of the first connecting hole 1112, the second connecting hole and the first connecting piece, and the structure is simple, convenient to install and disassemble, and the connection strength is high.

[0050] For example, in a possible embodiment, six first connecting holes 1112 are arranged along the circumference of the light passing hole 1111.

[0051] Further, continuing to refer to Figure 3 In the embodiment, a plurality of third connecting holes 1113 are arranged on the circumference of the bottom plate 111, a fourth connecting hole 122 corresponding to each third connecting hole 1113 is arranged on the heating member 120, and a fifth connecting hole 1122 corresponding to each fourth connecting hole 122 is arranged on the cover plate 112. A second connecting piece (not shown in the figure) is arranged in each group of corresponding third connecting holes 1113, fourth connecting holes 122 and fifth connecting holes 1122, so as to connect the bottom plate 111, the heating member 120 and the cover plate 112 together. The connection of the bottom plate 111 and the cover plate 112 is realized through the cooperation of the third connecting hole 1113, the fourth connecting hole 122, the fifth connecting hole 1122 and the second connecting piece, and the structure is simple, convenient to install and disassemble, and the connection strength is high.

[0052] Further, as shown in Figure 4 The bottom plate 111 is provided with a boss 1115 on the plate surface away from the heating element 120, which is used to abut on the workbench of the back focal length measuring mechanism. By arranging the boss 1115, the abutting area of the bottom plate 111 on the workbench of the back focal length measuring mechanism is reduced, which reduces the machining precision requirement of the bottom plate 111 on the one hand, and reduces the heat transfer area between the bottom plate 111 and the workbench of the back focal length measuring mechanism, thereby reducing the influence of heat on the accuracy of the measurement results.

[0053] The working process of the lens module testing device provided in the embodiment is as follows:

[0054] Firstly, the lens module 10 is placed in a room temperature environment for 1 hour to make the lens module 10 in a normal temperature stable state.

[0055] Then, the lens module 10 is installed on the mounting portion 101 of the temperature control tool 100, and the initial back focal value of the lens module 10 is measured by using the back focal length measuring mechanism and recorded.

[0056] After that, the temperature control tool 100 is placed in the sealed cavity of the shell, and the heating temperature of the temperature control tool 100 is set according to the test requirement. After the temperature is stable, the temperature control tool 100 is quickly taken out from the shell and immediately placed on the back focal length measuring mechanism to detect the back focal value of the lens module 10 at the temperature and record it.

[0057] Finally, the heating temperature of the temperature control tool 100 is changed, and the above step is repeated.

[0058] It is worth noting that the back focal length change amount of the lens module 10 = the back focal value after heating - the initial back focal value - the expansion amount of the temperature control tool 100.

[0059] It can be understood that the expansion amount of the temperature control tool 100 can be obtained through experiments before the test.

[0060] The lens module testing device can also obtain the limit temperature that the lens module 10 can withstand.

[0061] Embodiment two

[0062] The embodiment provides a lens module testing device, which is basically the same as the structure of embodiment one, and only improves on the basis of embodiment one. Therefore, only the differences between the two are described here, and the same structure of the embodiment and embodiment one is not described here. In the embodiment, the same or corresponding technical features as in embodiment one are denoted by the same reference numerals.

[0063] Specifically, in the embodiment, the first clamping portions are arranged on the opposite side walls of the bottom plate 111, the second clamping portions are arranged on the opposite side walls of the cover plate 112, and the second clamping portions are clamped in the corresponding first clamping portions. The connection between the bottom plate 111 and the cover plate 112 is achieved by clamping, which is simple in structure and facilitates quick assembly and disassembly of the bottom plate 111 and the cover plate 112.

[0064] Optionally, as shown in Figure 5 One of the first clamping portions and the second clamping portions can be the elastic buckle 1123, and the other can be the clamping groove 1114, which is clamped with the elastic buckle 1123.

[0065] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A lens module testing device, characterized in that, include: Temperature control fixture (100) includes a fixing base (110) and a heating element (120). The fixing base (110) includes a base plate (111) for mounting a base (11) of a lens module (10). The heating element (120) is disposed on the base plate (111) to provide different heating temperatures to the base plate (111) so that the base plate (111) can simulate the heating temperature of the circuit boards of different cameras. A back focal length measuring mechanism is used to measure the back focal length of the lens module (10).

2. The lens module testing device according to claim 1, characterized in that, The lens module testing device also includes a housing with a sealed cavity inside, which is used to accommodate the temperature control fixture (100).

3. The lens module testing device according to claim 1, characterized in that, The heating element (120) includes a heating body, a heating wire, and a temperature controller. The heating wire is disposed inside the heating body, and the temperature controller is connected to the heating wire to control the heating temperature of the heating wire.

4. The lens module testing device according to claim 1, characterized in that, The fixed base (110) also includes a cover plate (112) connected to the base plate (111), and the heating element (120) is sandwiched between the base plate (111) and the cover plate (112).

5. The lens module testing device according to claim 4, characterized in that, The base plate (111) has a mounting part (101) in the middle that is detachably connected to the base (11). The mounting part (101) has a light-transmitting hole (1111) that is opposite to the lens (12) of the lens module (10). The heating element (120) has a first clearance hole (121) that corresponds to the light-transmitting hole (1111). The cover plate (112) has a second clearance hole (1121) that corresponds to the first clearance hole (121). The first clearance hole (121) and the second clearance hole (1121) are used for the base (11) to pass through.

6. The lens module testing device according to claim 5, characterized in that, Along the circumference of the light-transmitting hole (1111), a plurality of first connecting holes (1112) are provided on the base plate (111), and the base (11) is provided with second connecting holes corresponding one-to-one with the first connecting holes (1112). A first connector is inserted into each pair of corresponding first connecting holes (1112) and second connecting holes to fix the base (11) on the base plate (111).

7. The lens module testing device according to claim 4, characterized in that, The base plate (111) has a plurality of third connecting holes (1113) in its circumference. The heating element (120) has a fourth connecting hole (122) that corresponds one-to-one with the third connecting hole (1113). The cover plate (112) has a fifth connecting hole (1122) that corresponds one-to-one with the fourth connecting hole (122). A second connecting member is inserted into each set of corresponding third connecting holes (1113), fourth connecting holes (122) and fifth connecting holes (1122) to connect the base plate (111), the heating element (120) and the cover plate (112) together.

8. The lens module testing device according to claim 4, characterized in that, The bottom plate (111) has a first snap-fit ​​portion on its opposite side walls, and the cover plate (112) has a second snap-fit ​​portion on its opposite side walls, the second snap-fit ​​portion snapping into the first snap-fit ​​portion corresponding to it.

9. The lens module testing device according to claim 8, characterized in that, One of the first latching part and the second latching part is an elastic buckle (1123) and the other is a slot (1114), and the slot (1114) is latched with the elastic buckle (1123).

10. The lens module testing device according to any one of claims 1-9, characterized in that, The base plate (111) has a boss (1115) on the plate surface opposite to the heating element (120), and the boss (1115) is used to support the worktable of the back focal length measuring mechanism.

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