KR20170047141A - Inspection apparatus for lens module - Google Patents

Inspection apparatus for lens module Download PDF

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Publication number
KR20170047141A
KR20170047141A KR1020150155410A KR20150155410A KR20170047141A KR 20170047141 A KR20170047141 A KR 20170047141A KR 1020150155410 A KR1020150155410 A KR 1020150155410A KR 20150155410 A KR20150155410 A KR 20150155410A KR 20170047141 A KR20170047141 A KR 20170047141A
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KR
South Korea
Prior art keywords
lens
lens module
distance measuring
unit
measured
Prior art date
Application number
KR1020150155410A
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Korean (ko)
Inventor
이원복
길기재
Original Assignee
이원복
길기재
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Publication of KR20170047141A publication Critical patent/KR20170047141A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0207—Details of measuring devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements

Abstract

The present invention relates to an inspection apparatus, and more particularly, to a lens module inspection apparatus for inspecting a lens module having an auto-focus adjustment function.
The present invention relates to an automatic focusing apparatus for a lens module lens module (10) including at least one lens (13) provided so as to be movable upward and downward from an image pickup element and a guide section (12) for guiding up and down movement of the lens A lens module inspection apparatus for inspecting a function, comprising: a lens linear movement signal generation unit (500) for generating a lens linear movement signal of the lens (13); Three or more distance measuring units 200 for measuring the distance by irradiating light to the surface 13a of the lens 13 which is moved up and down by the lens linear motion signal generating unit 500; The reflecting surfaces 101, 102, and 103 that refract the light irradiated from the distance measuring unit 200 at an angle larger than 0 degrees and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, 103) corresponding to the respective distance measuring units (200); It is determined whether or not the autofocusing of the lens module 10 based on the measurement value measured by the distance measuring unit 200 with respect to the lens 13 moved up and down by the lens linear motion signal generating unit 500 And a control unit (600) for determining the lens module inspection apparatus.

Description

[0001] LENS MODULE INSPECTION APPARATUS [0002]

The present invention relates to an inspection apparatus, and more particularly, to a lens module inspection apparatus for inspecting a lens module having an auto-focus adjustment function.

Due to the development of technology, cameras have been installed in various smart devices, and consumers' desire to use better cameras has increased.

Therefore, a camera with AF (Autofocusing) function has begun to be used.

As shown in FIG. 1, the camera having the automatic focusing function, that is, the auto focusing function, is configured such that the lens module is moved up and down along the guide portion. When any one of the guide portion and the lens module is inclined There is a problem that the image can not be normally photographed and the camera may be defective.

Therefore, it is necessary to prevent the defective product beforehand by preliminarily measuring the installation state of the lens module, the guide part, etc., in the camera to which the AF function is added, that is, the inclination of the surface of the lens module.

However, as the installation space of the camera is narrow, such as the shape of the smart phone being thin, the camera is also becoming smaller and thinner with a horizontal diameter of about 5 mm to 10 mm.

Meanwhile, in order to measure the installation state such as the inclination and the seating state of the lens module of the camera, measurement is required through at least three distance measuring sensors. As the camera is miniaturized, due to interference between the plurality of distance measuring sensors, There is a problem that it can not be measured.

Furthermore, when a laser of a distance measuring sensor is used, there is a problem that a distance between the distance measuring sensor and an adjacent distance measuring sensor is narrow, resulting in a laser interference phenomenon.

In order to solve the above problems, an object of the present invention is to provide a lens module of a small-sized camera having an auto-focusing function, further comprising a reflecting member for refracting three or more lights irradiated on a surface to be inspected of the lens module, The present invention also provides a lens module inspecting apparatus that can accurately and easily perform an inspection of an auto-focusing function for a small-sized lens module.

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above-mentioned object of the present invention, and it is an object of the present invention to provide an image pickup apparatus, which comprises at least one lens 13 provided so as to be movable upward and downward from an image pickup element, A lens linear motion signal generator 500 for generating a lens linear motion signal of the lens 13, and a lens linear motion signal generator 500 for generating a lens linear motion signal of the lens 13, )Wow; Three or more distance measuring units 200 for measuring the distance by irradiating light to the surface 13a of the lens 13 which is moved up and down by the lens linear motion signal generating unit 500; The reflecting surfaces 101, 102, and 103 that refract the light irradiated from the distance measuring unit 200 at an angle larger than 0 degrees and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, 103) corresponding to the respective distance measuring units (200); It is determined whether or not the autofocusing of the lens module 10 based on the measurement value measured by the distance measuring unit 200 with respect to the lens 13 moved up and down by the lens linear motion signal generating unit 500 And a control unit (600) for determining the lens module inspection apparatus.

The reflection unit 100 may be configured such that the irradiation angle of the light emitted from the distance measuring unit 200 is greater than 0 degrees and less than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, And a main body 110 having reflective surfaces 101, 102, and 103 formed thereon.

The reflector 100 may further include a support member 120 for maintaining the installed state of the main body 110 on the distance measuring unit 200.

The main body 110 may have a pyramidal structure having a side surface corresponding to the number of the distance measuring units 200.

The main body 110 may be composed of a plurality of division members 111, 112, and 113.

The lens linear motion signal generating unit 500 may detect the position of the lens 13 in accordance with preset time intervals and predetermined measurement positions between the highest position and the lowest position of the lens 13 on the guide unit 12. [ The lens linear movement signal of the lens can be generated.

The lens module inspection apparatus according to the present invention further includes a reflection member for refracting at least three lights irradiated on the surface to be measured of the lens module to be inspected in the lens module of the small camera having the auto focusing function, There is an advantage that the inspection of the auto-focusing function for the lens module of the camera can be performed accurately and easily.

In particular, it is possible to conveniently check whether the auto focusing function of the lens module is normally implemented by checking the seating state of the lens while moving the lens along the guide portion in the lens module.

1 is a schematic diagram conceptually showing a case where a lens module is defective in a camera.
2 is a block diagram showing the configuration of an apparatus for inspecting a lens module according to the present invention.
3 is a perspective view showing a lens module inspection apparatus according to the present invention.
Fig. 4 is a partial perspective view of the lens module inspection apparatus of Fig. 3 viewed from another angle. Fig.
Fig. 5 is a plan view of the lens module inspection apparatus of Fig. 3; Fig.
Fig. 6 is a front view of the lens module inspection apparatus of Fig. 3;
FIG. 7 is a partial perspective view showing a reflecting portion and an object to be inspected of the lens module testing apparatus of FIG. 3;
8A and 8B are perspective views showing modifications of the reflection unit installed in the lens module inspection apparatus of FIG.
FIG. 9 is a conceptual diagram showing the inspection process by the lens module inspection apparatus of FIG. 3 when the lens module is defective.
FIG. 10 is a conceptual diagram showing the inspection process by the lens module inspection apparatus of FIG. 3 when the lens module is good.

Hereinafter, a lens module inspection apparatus according to the present invention will be described with reference to the accompanying drawings.

2 to 10, the apparatus for inspecting a lens module according to the present invention comprises at least one lens 13 provided so as to be movable upward and downward from an image pickup element, A lens module inspection apparatus for inspecting an autofocusing function of a lens module lens module (10) including a guide part (12), comprising: a lens linear movement signal generation part (500) for generating a lens linear movement signal of the lens (13) Wow; Three or more distance measuring units 200 for measuring the distance by irradiating light to the surface 13a of the lens 13 which is moved up and down by the lens linear motion signal generating unit 500; The reflecting surfaces 101, 102, and 103 that refract the light irradiated from the distance measuring unit 200 at an angle larger than 0 degrees and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, 103) corresponding to the respective distance measuring units (200); It is determined whether or not the autofocusing of the lens module 10 based on the measurement value measured by the distance measuring unit 200 with respect to the lens 13 moved up and down by the lens linear motion signal generating unit 500 And a control unit 600 for determining whether or not there is an error.

Here, it is needless to say that the lens module 10 of the inspection apparatus according to the present invention may constitute a camera module itself as a lens module which forms a part of a camera and adjusts a distance to the subject.

In particular, the object to be inspected may be any object as long as it has at least a plane having a predetermined flatness or more with a small-sized module, such as a small-sized camera module, which can not be measured by a plurality of distance measuring sensors.

For example, the subject to be inspected may be a lens module of a small-sized camera.

The lens module may have various configurations such as a guide portion (not shown) provided on the upper side of the image pickup device constituting the camera and at least one lens 13 installed to move linearly along the guide portion.

The lens 13 may include a lens portion 13b having a predetermined curvature and at least one hub portion 13a formed integrally with the lens 13 along the edge of the lens portion 13b, The upper surface of the upper surface 13a may be the surface 13a to be measured.

The inspection contents by the inspection object include the inclination of the lens 13 with respect to the front surface, the mounting state with respect to the guide portion, that is, the inclination with respect to the front surface of the lens module with respect to the guide portion in the vertical state, The inclination of the lens module with respect to the front surface of the lens module may be an object of inspection.

Specifically, when the surface to be measured 13a becomes the upper surface of the hub portion 13b, the installation state of the hub portion 13b formed integrally with the lens 13 is checked, The state can be measured.

On the other hand, the object to be inspected 10 needs to be precisely measured, such as the inclination of the surface 13a to be measured, so that it is preferable that the inspection die (not shown) having a flatness higher than a preset level is seated on the object.

Here, it is preferable that the inspection die is set to a relative position with respect to the reflection unit 100, an object to be inspected 10 mounted on the upper surface thereof, and a distance measuring unit 200, which will be described later.

The reflector 100 is arranged to reflect the light radiated from the distance measuring unit 200 with respect to the normal line of the surface 13a to be measured of the lens module 10, The slopes 101, 102, and 103 are formed in correspondence with the distance measuring units 200, and various configurations are possible.

3, the reflection unit 100 may reflect the light radiated from the distance measuring unit 200 at an angle of 0 DEG to the normal line of the surface 13a to be measured of the lens module 10, And a supporting member 120 for maintaining the installed state of the main body 110 on the distance measuring unit 200. The main body 110 has a reflecting surface 101, ).

The main body 110 has a reflecting surface that is bent at an angle larger than 0 degrees and smaller than 180 degrees with respect to a normal line of the surface to be measured 13a of the lens module 10, (101, 102, 103).

The reflecting surfaces 101, 102, and 103 are arranged such that the irradiation angle of the light emitted from the distance measuring unit 200 is larger than 0 and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10. [ And various structures, materials and shapes can be used as long as the structure and the shape are formed with high flatness and reflectivity.

In particular, it is preferable that the reflecting surfaces 101, 102, and 103 are coated or formed of a material having a high reflectance.

The reflecting surfaces 101, 102, and 103 are formed to have a number corresponding to the number of the distance measuring units 200.

The main body 110 may have a pyramidal structure corresponding to the number of the distance measuring units 200 so as to have the same distance condition for the distance measuring unit 200 and the lens module 10.

For example, when the number of the distance measuring units 200 is three, the main body 110 may be formed of a triangular pyramid, and the other surface may be coupled to the supporting member 120.

In addition, the main body 11 may have three or more reflective surfaces, in particular, four or more reflective surfaces, irrespective of the number of the distance measuring units 200. In this case, The number of the distance measurement units 200 may be three or more and correspond to all or a part of three or more reflective surfaces depending on design and design.

The main body 110 constituting the reflection unit 100 may be formed by combining a plurality of division members. Specifically, as shown in FIG. 8A, three division members 111, 112, . ≪ / RTI >

At this time, it is preferable that the division members 111, 112, and 113 are formed with reflection surfaces 101, 102, and 103 at positions corresponding to the distance measurement unit 200 described later.

Meanwhile, the main body 110 may be composed of four or more divided members 111, 112, 113 and 114 as shown in FIG. 7B.

The reflective surfaces 101, 102, 103, and 104 may be formed at positions corresponding to the outer surfaces of the main body 110. [

It is preferable that the distance measuring unit 200 is installed corresponding to at least some of the reflecting surfaces 101, 102, 103 and 104, and three or more reflecting surfaces.

Meanwhile, the main body 110 may have three or more reflection surfaces with respect to the number of the plurality of reflection surfaces, and when there are four or more, only some reflection surfaces, for example, three reflection surfaces, It is possible.

At this time, the distance measuring unit 200 may be installed corresponding to all of the reflecting surfaces, or may be installed corresponding to at least a part of the reflecting surfaces, depending on the purpose of measurement such as inclination.

The main body 110 has a reflective surface, but it is also possible that the illumination angle of the light emitted from the prism or distance measuring unit 200 is set to be normal to the surface 13a to be measured of the lens module 10 Can be bent at an angle larger than 0 DEG and less than 180 DEG.

The support member 120 is configured for convenience of installation such as coupling with an external structure at a predetermined position with respect to the distance measuring unit 200 and the subject 10 to be inspected, It is possible.

3, the support member 120 may have a polygonal structure that is coupled to the bottom surface of the main body 110 of the pyramid structure.

Further, the support member 120 and the main body 110 may be integrally formed with each other.

Needless to say, the support member 120 is not essential and the reflector 100 may be formed only of the main body 110.

The distance measurement units 200 may be variously configured as distance measurement sensors provided at positions corresponding to the respective reflection surfaces 101, 102, and 103 of the reflection unit 100, as shown in FIG.

For example, the distance measuring unit 200 may include a light source unit (not shown) that irradiates light in the direction of the reflection unit 100 and a light source unit (not shown) that irradiates the surface 11 of the lens module 10 via the reflection unit 100 And a sensor unit for analyzing the light reflected by the reflection unit 100 and measuring the distance to the surface 13a of the lens module 10 to be measured.

The distance measuring unit 200 measures the distance by measuring the reflectance of RGB (Red, Green, Blue) in the light source using a white light source as a light source, or uses a laser as a light source to measure the reflectance The distance can be measured by measuring.

On the other hand, the installation position and the number of the distance measuring unit 200 are determined by the number of reflecting surfaces 101, 102, and 103 of the reflecting unit 100, and the reflecting surfaces 100, 103 are three, the distance measuring unit 200 is also provided in three.

Here, when the number of reflection surfaces 101, 102, and 103 of the reflection unit 100 is four or more, the number of the distance measurement units 200 may be smaller.

The distance from the distance measuring unit 200 to the reflecting surface 100 of the lens module 100 is measured in the first direction toward the reflecting surfaces 101, 102 and 103 of the reflecting unit 100 and the reflecting surfaces 100, It is preferable that the second directions toward the measured surface 13a of the first and second substrates 10 are perpendicular to each other.

A second direction from the reflective surfaces 101, 102, and 103 of the reflective portion 100 toward the surface 13a to be measured of the lens module 10 is a direction toward the surface 13a to be measured of the lens module 10, It is preferable to set it in the normal direction.

It should be noted that the measured surface 13a of the lens module 10 is an ideal plane, and the measured surface 13a of the lens module 10 may be inclined with respect to an ideal plane.

5, the distance measuring unit 200 may be disposed at an angle of 120 degrees with respect to the reflecting unit 100 when the three measuring units 200 are installed.

The distance measuring unit 200 may irradiate light to the light irradiation positions P1, P2, and P3 of the lens module 10 with respect to the surface to be measured 13a of the lens module 10.

The light irradiation positions P1, P2, and P3 are determined to be appropriate positions for irradiating the inclination of the measurement surface 13a of the lens module 10 and the like.

The distance measuring unit 200 measures the heights H1, H2 and H3 of the lens module 10 with respect to the surface 13a to be measured and the measured heights H1, H2 and H3, The inclination of the surface 13a of the lens module 10 to be measured can be measured.

Specifically, a predetermined plane is obtained based on the measured values of the heights H1, H2, and H3 measured by the distance measuring unit 200, and the measured surface of the lens module 10 13a can be measured.

In order to examine the autofocusing function of the lens module 10, the inspection apparatus having the configuration of the distance measuring unit 200 and the reflection unit 100 may include a lens linear movement signal generating unit 500 and a control unit 600) is additionally required.

The lens linear movement signal generating unit 500 is configured to generate a lens linear movement signal of the lens 13, and various configurations are possible.

Specifically, the lens linear motion signal generator 500 is a circuit configuration for generating a lens linear motion signal. The lens linear motion signal generator 500 may include a separate independent configuration such as a test configuration, all or a part of the lens linear motion signal generator 500, And various other embodiments are possible.

In particular, the lens linear movement signal generating unit 500 generates the lens linear movement signal generating unit 500 based on a preset time interval between the highest position and the lowest position of the lens 13 on the guide unit 12, 13 of the lens linear movement signal.

The controller 600 controls the lens module 10 to move the lens 13 in the vertical direction based on the measured value measured by the distance measuring unit 200 with respect to the lens 13 moved up and down by the lens linear movement signal generator 500. [ It is possible to make various configurations as a configuration for judging whether or not the auto focusing of

In particular, the control unit 600 may be a circuit configuration rather than a physical configuration similar to the lens linear movement signal generation unit 500, and may include a separate independent configuration, other members such as a test jig, Various embodiments are possible.

Also, the controller 600 may control the distance measuring unit 200 as well as the lens linear movement signal generating unit 500.

Meanwhile, the lens linear movement signal generator 500 and the controller 600 can perform the inspection by various methods.

For example, the lens linear motion signal generator 500 linearly moves the lens 13 upward or downward at predetermined time intervals, predetermined distance intervals, etc., and the distance measuring unit 200 moves the lens 13 13 can be measured to determine whether the lens 13 is smoothly moved within the guide portion, whether it is moved by a predetermined movement distance, and the like.

The measured values of the heights H1, H2 and H3 measured by the distance measuring unit 200 are transmitted to a controller (not shown) to analyze the tilt value of the lens module 10 can do.

Each of the distance measurement units 200 measures the height H1, H2, H3 of each of the light irradiation positions P1, P2, and P3 by one point every 0.02 seconds (20 mm / sec) The height of 100 points can be measured to measure the height when the AF (Autofocusing) function is performed.

The measurement values measured as described above are transmitted to a control unit (not shown), and it is possible to determine whether the product is defective by analyzing a tilt value of the lens module 10 at the time of performing AF (Autofocusing) function.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

10: object to be inspected 100:
200: distance measuring unit

Claims (6)

Checking the autofocusing function of the lens module lens module 10 including at least one lens 13 provided so as to be vertically movable from above the imaging element and a guide portion 12 guiding the up and down movement of the lens 13 The lens module inspection apparatus comprising:
A lens linear motion signal generator 500 for generating a lens linear motion signal of the lens 13;
Three or more distance measuring units 200 for measuring the distance by irradiating light to the surface 13a of the lens 13 which is moved up and down by the lens linear motion signal generating unit 500;
The reflecting surfaces 101, 102, and 103 that refract the light irradiated from the distance measuring unit 200 at an angle larger than 0 degrees and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, 103) corresponding to the respective distance measuring units (200);
It is determined whether or not the autofocusing of the lens module 10 based on the measurement value measured by the distance measuring unit 200 with respect to the lens 13 moved up and down by the lens linear motion signal generating unit 500 And a control unit (600) for determining whether the lens module is mounted on the vehicle. The method according to claim 1,
The reflector 100 includes:
The reflecting surfaces 101, 102, and 103 that refract the light irradiated from the distance measuring unit 200 at an angle larger than 0 degrees and smaller than 180 degrees with respect to the normal line of the surface 13a to be measured of the lens module 10, 103) is formed on the main body (110). The method of claim 2,
Wherein the reflection unit (100) further includes a support member (120) for maintaining the installed state of the main body (110) on the distance measuring unit (200). The method of claim 2,
Wherein the main body (110) has a pyramidal structure having sides corresponding to the number of the distance measuring units (200). The method of claim 4,
Wherein the main body (110) is composed of a plurality of division members (111, 112, 113). The method according to claim 1,
The lens linear movement signal generator 500 includes:
And generates a lens linear movement signal of the lens (13) according to a preset time interval and preset measurement positions between the highest position and the lowest position of the lens (13) on the guide part (12) Lens module inspection device.
KR1020150155410A 2015-10-21 2015-11-05 Inspection apparatus for lens module KR20170047141A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102303188B1 (en) * 2020-07-03 2021-09-17 주식회사 액트로 Device for inspecting displacement error of each moving lens of camera module
KR102303187B1 (en) * 2020-07-03 2021-09-17 주식회사 액트로 Device for inspecting displacement error of each moving lens of camera module and operation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102303188B1 (en) * 2020-07-03 2021-09-17 주식회사 액트로 Device for inspecting displacement error of each moving lens of camera module
KR102303187B1 (en) * 2020-07-03 2021-09-17 주식회사 액트로 Device for inspecting displacement error of each moving lens of camera module and operation method thereof

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