CN219179231U - Optical test equipment - Google Patents

Abstract

The application discloses optical test equipment provides test light of different angles for the object to be tested through setting up the first annular light source and the second annular light source of co-altitude, realizes providing multiple light environment for the object to be tested. The application provides an optical test device comprising: the detection table is used for connecting an object to be tested; the support frame assembly is connected with the detection table; the annular light source assembly comprises a first annular light source and a second annular light source, the first annular light source and the second annular light source are connected with the support frame assembly and are positioned above the detection table, and the second annular light source is farther from the detection table than the first annular light source, so that the first annular light source and the second annular light source provide test light with different angles for an object to be tested; the image shooting device is connected with the support frame assembly and is positioned at one side of the second annular light source opposite to the detection table and used for acquiring an image of the object to be tested. The method and the device are mainly used for optical testing of the object to be tested.

Description

Optical test equipment

Technical Field

The application relates to the technical field of machine vision, in particular to optical test equipment.

Background

In order to enable the machined product to meet the design precision and quality requirements, quality detection needs to be performed in the production process of the product, wherein visual detection (optical detection) is widely applied to realize rapid and accurate measurement of high-quality performance, images of the object to be tested in an illumination environment are collected through cooperation of a camera and a light source, and intelligent image processing is matched, so that whether the product is qualified in form and position tolerance, numerical aperture and the like or not and whether the surface of the product is rough, cracked and appearance defects or not can be detected. The objects to be tested may be various, such as a cell phone camera module (CCM, camera Compact Modu l e), plastic, hardware, etc.

The light source in the prior art can only provide single-angle light for the object to be tested, only can acquire images of the object to be tested under a single-light environment, but for the object to be tested with different styles and different models, the defect positions of the object to be tested are different, the light source with multiple angles is required to illuminate to show the defect positions, the single-light environment can not meet the requirements of diversified light environments, and the multiple light sources are required to be replaced aiming at the detection requirements of the object to be tested, so that the universality of the light source is poor, the detection process is long in period, the operation is complex, and the cost is high.

Disclosure of Invention

In view of this, the present application provides an optical testing device, which is mainly used for solving the problem that a single detection light source cannot adapt to multiple detection requirements.

In order to achieve the above purpose, the present application mainly provides the following technical solutions:

in one aspect, the present application provides an optical test apparatus comprising:

a detection table (100), wherein the detection table (100) is used for connecting an object to be tested;

the support frame assembly (200), the support frame assembly (200) is connected with the detection table (100);

the annular light source assembly (300) comprises a first annular light source (310) and a second annular light source (320), the first annular light source (310) and the second annular light source (320) are connected with the support frame assembly (200) and are located above the detection table (100), and the second annular light source (320) is farther from the detection table (100) than the first annular light source (310), so that the first annular light source (310) and the second annular light source (320) provide test light with different angles for an object to be tested;

The image pickup device (400) is connected with the support frame assembly (200), and is positioned at one side of the second annular light source (320) opposite to the detection table (100) and used for acquiring an image of the object to be tested.

The annular light source assembly (300) further comprises a shell (301), the shell (301) is of a cavity structure comprising a light path channel, the light path channel penetrates through two ends of the shell (301), the shell (301) comprises a central line, the central line is perpendicular to the detection table (100), the shell (301) is symmetrical relative to the central line, an opening at the bottom end of the light path channel is used for being opposite to an object to be detected, and the image capturing device (400) is opposite to an opening at the top end of the light path channel;

the first annular light source (310) and the second annular light source (320) are both arranged on the inner wall of the light path channel, and the included angle between the light of the second annular light source (320) and the central line is smaller than the included angle between the light of the first annular light source (310) and the central line, so that the first annular light source (310) and the second annular light source (320) respectively provide test light for an object to be tested through different inclined angles.

Wherein, the included angle between the light ray of the first annular light source (310) and the central line is more than or equal to 70 degrees and less than or equal to 90 degrees;

the included angle between the light rays of the second annular light source (320) and the central line is more than or equal to 50 degrees and less than or equal to 70 degrees.

The annular light source assembly (300) further comprises a third annular light source (330), the inner wall of the light path channel comprises an arc-shaped top surface (302), the arc-shaped top surface (302) and the third annular light source (330) are both positioned on one side, far away from the detection table (100), of the second annular light source (320), and the third annular light source (330) is closer to the detection table (100) than the arc-shaped top surface (302);

the arc-shaped top surface (302) gradually converges in a direction away from the detection table (100), the third annular light source (330) faces the arc-shaped top surface (302), and light rays of the third annular light source (330) are projected to the arc-shaped top surface (302) and reflected by the arc-shaped top surface (302) to provide uniform test light for an object to be tested.

The third annular light source (330) comprises at least two dome sub-light sources, the first annular light source (310) and the second annular light source (320) comprise at least two side sub-light sources, the number of the dome sub-light sources is the same as that of the side sub-light sources, and the dome sub-light sources and the side sub-light sources are in one-to-one correspondence in the direction close to the detection table (100).

Wherein the arc-shaped top surface (302) is a spherical surface, and the radius of the arc-shaped top surface (302) is more than or equal to 85 mm and less than or equal to 100 mm;

and/or, the included angle between the light ray of the third annular light source (330) and the central line is greater than or equal to 50 degrees and less than or equal to 80 degrees.

Wherein the optical test apparatus further comprises: the vertical light source assembly (500), the vertical light source assembly (500) is located between annular light source assembly (300) and image pickup device (400), the vertical light source assembly (500) includes mounting plate (510) and vertical light source, there are openings (511) on the mounting plate (510), the opening (511) is opposite to top opening of the light path channel, the image pickup device (400) is opposite to opening (511), the mounting plate (510) is perpendicular to central line, and the centre of the opening (511) is located on central line;

the vertical light source is arranged on the mounting plate (510) to provide test light for the object to be tested from a direction perpendicular to the detection table (100).

The vertical light sources comprise a first vertical light source (520) and a second vertical light source (530), a first mounting groove (512) and a second mounting groove (513) are formed in the mounting plate (510), and the first vertical light source (520) and the second vertical light source (530) are annular light sources;

the first mounting groove (512) surrounds the opening (511) for one circle, the second mounting groove (513) is positioned outside the first mounting groove (512) and surrounds the first mounting groove (512) for one circle;

the first vertical light source (520) is arranged in the first mounting groove (512), and the second vertical light source (530) is arranged in the second mounting groove (513), so that the first vertical light source (520) and the second vertical light source (530) respectively provide test light for an object to be tested in different projection ranges.

Wherein the optical test apparatus further comprises: a light distribution plate (600); the light homogenizing plate (600) is positioned on one side of the first annular light source (310) and/or the second annular light source (320) where light propagates, so that the light of the first annular light source (310) and/or the second annular light source (320) is uniformly projected;

and/or, the light homogenizing plate (600) is positioned at one side of the light propagation of the vertical light source so as to uniformly project the light of the vertical light source.

Wherein the first annular light source (310), the second annular light source (320) and/or the vertical light source comprise a plurality of point light sources which are uniformly distributed around the circumference of the central line;

the point light source is an LED lamp bead.

Wherein the optical test apparatus further comprises: the parallel light source assembly (700), the parallel light source assembly (700) is located between the image capturing device (400) and the annular light source assembly (300), and the parallel light source assembly (700) is used for providing parallel light for an object to be tested by the direction perpendicular to the detection table (100).

Wherein, the parallel light source assembly (700) comprises a shell (710), an array light source (720), a diffusion plate (730) and a semi-transparent lens (740);

the shell (710) comprises an upper opening (701) and a lower opening (702), the upper opening (701) is opposite to the lower opening (702), the lower opening (702) is opposite to the annular light source assembly (300), the array light source (720) is arranged on one side in the shell (710), light rays of the array light source (720) are parallel to the upper opening (701), the semi-transparent lens (740) is arranged in the shell (710) and opposite to the upper opening (701), the semi-transparent lens (740) and light rays of the array light source (720) form an included angle of 45 degrees, and the diffusion plate (730) is arranged between the semi-transparent lens (740) and the array light source (720);

After passing through the diffusion plate (730) and the semi-transparent lens (740), the light of the array light source (720) is projected to the object to be tested in parallel, and after passing through the semi-transparent lens (740), the reflected light of the object to be tested is projected to the image capturing device (400) through the upper opening (701).

The support frame assembly (200) comprises a support main body (210), a first moving rod (220), a second moving rod (230) and a height adjusting assembly, wherein the support main body (210) is connected with the detection table (100), the height adjusting assembly is connected with the support main body (210), one end of the first moving rod (220) is connected with the height adjusting assembly, the other end of the first moving rod (220) is connected with the annular light source assembly (300), one end of the second moving rod (230) is connected with the height adjusting assembly, and the other end of the second moving rod (230) is connected with the image capturing device (400);

the height adjustment assembly is used for adjusting the heights of the first movable rod (220) and the second movable rod (230) so as to enable the annular light source assembly (300) and the image pickup device (400) to be close to or far away from the detection table (100).

According to the optical test equipment, the first annular light source and the second annular light source with different heights are arranged, so that the first annular light source and the second annular light source provide test light with different angles for an object to be tested, and multiple light environments are provided for the object to be tested. In the prior art, in the optical detection of an object to be tested, a light source can only provide light rays with a single angle for the object to be tested, and only can acquire images of the object to be tested under a single light ray environment, but for objects to be tested with different styles and different models, defect positions may be different, the single light ray environment cannot meet the requirements of diversified light ray environments, and various light sources are required to be replaced according to the detection requirements of the object to be tested, so that the universality of the light sources is poor, the detection process is long in period, the operation is complex, and the cost is high. Compared with the prior art, in this application file, first ring light source and second ring light source are located the test bench top, the second ring light source compares first ring light source higher for the angle that the light of first ring light source and second ring light source projected to the test object is different, with the test light that provides different angles for the test object, makes the image acquisition device can acquire the image of test object under different test lights, makes the different characteristics of test object can be highlighted, avoids the loaded down with trivial details operation of detection process change light source, makes detection efficiency higher.

Drawings

FIG. 1 is a schematic diagram of an overall structure of an optical test apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic perspective view of an annular light source assembly and a vertical light source assembly according to an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view of a ring-shaped light source assembly and a vertical light source assembly in a direction of a center line according to an embodiment of the present disclosure;

FIG. 4 is a schematic perspective view of another annular light source assembly and vertical light source assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional view of a housing and mounting plate from a first perspective provided in an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of a housing and mounting plate at a second perspective provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a parallel light source assembly according to an embodiment of the present disclosure;

the device comprises a detection table-100, a support frame assembly-200, a support main body-210, a first movable rod-220, a second movable rod-230, an annular light source assembly-300, a shell-301, an arc-shaped top surface-302, a first annular side surface-303, a second annular side surface-304, an annular table-305, a first annular light source-310, a second annular light source-320, a third annular light source-330, an image pickup device-400, a vertical light source assembly-500, a mounting plate-510, an opening-511, a first mounting groove-512, a second mounting groove-513, a first vertical light source-520, a second vertical light source-530, a light homogenizing plate-600, a parallel light source assembly-700, a shell-710, an array light source-720, a diffusion plate-730, a semi-transparent lens-740, an upper opening-701 and a lower opening-702.

Detailed Description

In order to further describe the technical means and effects adopted by the present application to achieve the preset utility model, the following detailed description will refer to the specific implementation, structure, characteristics and effects of the light source according to the present application with reference to the accompanying drawings and preferred embodiments.

In one aspect, as shown in fig. 1-4, an embodiment of the present application provides an optical test apparatus, including:

a detection table (100), wherein the detection table (100) is used for connecting an object to be tested;

the support frame assembly (200), the support frame assembly (200) is connected with the detection table (100);

the annular light source assembly (300) comprises a first annular light source (310) and a second annular light source (320), the first annular light source (310) and the second annular light source (320) are connected with the support frame assembly (200) and are located above the detection table (100), and the second annular light source (320) is farther from the detection table (100) than the first annular light source (310), so that the first annular light source (310) and the second annular light source (320) provide test light with different angles for an object to be tested;

the image pickup device (400) is connected with the support frame assembly (200), and is positioned at one side of the second annular light source (320) opposite to the detection table (100) and used for acquiring an image of the object to be tested.

The detection platform (100) is a supporting main body of the whole optical test equipment, the optical test equipment can be placed in the openable closed detection space, the detection platform (100) is connected to the bottom surface of the closed detection space, in some embodiments, the detection platform (100) can move relative to the closed detection space, so that the detection platform (100) can be moved out from the lower part of the annular light source assembly (300), and the object to be tested can be conveniently taken and placed. The objects to be tested can be various, such as metal parts or mobile phone camera modules. The support frame assembly (200) is used for erecting the annular light source assembly (300) and the image pickup device (400) above the detection table (100) or the object to be tested. The light of the annular light source assembly (300) is projected onto a preset detection area of the detection table (100), the object to be tested is connected with the detection table (100) through the preset detection area, and the center of the preset detection area is opposite to the centers of the first annular light source (310) and the second annular light source (320). The optical axis of the image pickup device (400) is perpendicular to the detection table (100), and the center of the preset detection area, the centers of the first annular light source (310) and the second annular light source (320) are all located on the optical axis of the image pickup device (400). The image pickup device (400) may be a camera, and the optical axis of the image pickup device (400) is an axis passing through the center of the lens of the camera.

The first annular light source (310) and the second annular light source (320) are all annular light sources which surround the circle, and the light sources can be continuous light bodies or are formed by a plurality of point light sources which surround the circle circumferentially. The first annular light source (310) and the second annular light source (320) can be independent of each other, for example, the first annular light source (310) and the second annular light source (320) respectively comprise a circular annular support frame and a plurality of point light sources circumferentially encircling the inner wall of the support frame, the support frames of the first annular light source (310) and the second annular light source (320) are not connected, are independent of each other and are different in height, and the angles through the inner walls of the support frames are different, so that the first annular light source (310) and the second annular light source (320) can provide test lights with different angles for an object to be tested. Alternatively, in some embodiments, the first annular light source (310) and the second annular light source (320) are light sources disposed inside the same housing (301), and the first annular light source (310), the second annular light source (320), and the housing (301) are a unitary light source, and embodiments including the housing (301) are described in detail below.

The first annular light source (310) and the second annular light source (320) are coaxially arranged, the common axis of the first annular light source (310) and the second annular light source (320) is a central line (a), the heights of the first annular light source (310) and the second annular light source (320) are different, the included angles between the light rays of the first annular light source (310) and the second annular light source (320) and the central line (a) are different, and the light rays of the first annular light source (310) and the second annular light source (320) are projected onto a preset detection area or an object to be tested. When the device is used, the first annular light source (310) and the second annular light source (320) are sequentially started, so that the first annular light source (310) and the second annular light source (320) are independently started, a single-light-source test light environment view is provided for an object to be tested, the combination of light sources can be carried out, the first annular light source (310) and the second annular light source (320) are simultaneously started, a multi-light-source test light environment is provided for the object to be tested, the diversity of the test light environment is increased, and more features on the object to be tested are highlighted. In one embodiment, a strobe control manner may be adopted, so that the first annular light source (310) and/or the second annular light source (320) are sequentially and instantaneously highlighted according to a preset sequence, and the image capturing device (400) performs image capturing when the first annular light source (310) and/or the second annular light source (320) are turned on, so that a series of images under different test light environments can be quickly obtained in a short time, and the detection process is quick and efficient.

According to the optical test equipment, the first annular light source and the second annular light source with different heights are arranged, so that the first annular light source and the second annular light source provide test light with different angles for an object to be tested, and multiple light environments are provided for the object to be tested. In the prior art, in the optical detection of an object to be tested, a light source can only provide light rays with a single angle for the object to be tested, and only can acquire images of the object to be tested under a single light ray environment, but for objects to be tested with different styles and different models, defect positions may be different, the single light ray environment cannot meet the requirements of diversified light ray environments, and various light sources are required to be replaced according to the detection requirements of the object to be tested, so that the universality of the light sources is poor, the detection process is long in period, the operation is complex, and the cost is high. Compared with the prior art, in this application file, first ring light source and second ring light source are located the test bench top, the second ring light source compares first ring light source higher for the angle that the light of first ring light source and second ring light source projected to the test object is different, with the test light that provides different angles for the test object, makes the image acquisition device can acquire the image of test object under different test lights, makes the different characteristics of test object can be highlighted, avoids the loaded down with trivial details operation of detection process change light source, makes detection efficiency higher.

In one embodiment, the annular light source assembly (300) further comprises a housing (301), the housing (301) is of a cavity structure comprising a light path channel, the light path channel penetrates through two ends of the housing (301), the housing (301) comprises a central line (a), the central line (a) is perpendicular to the detection table (100), the housing (301) is symmetrical relative to the central line, an opening at the bottom end of the light path channel is used for being opposite to an object to be tested, and the image capturing device (400) is opposite to an opening at the top end of the light path channel. The first annular light source (310) and the second annular light source (320) are both arranged on the inner wall of the light path channel, and the included angle between the light of the second annular light source (320) and the central line (a) is smaller than the included angle between the light of the first annular light source (310) and the central line (a), so that the first annular light source (310) and the second annular light source (320) respectively provide test light for an object to be tested through different inclination angles.

The interior of the light path channel comprises a first annular side (303) and a second annular side (304), the first annular side (303) being an engagement surface with the bottom end opening, or the bottom end edge of the first annular side (303) being an edge of the bottom end opening of the light path channel. The first annular light source (310) is a plurality of LED lamp beads which are uniformly distributed on the periphery of the first annular side face (303), namely point light sources. The number of the LED lamp beads is 48-60, and the number of the LED lamp beads can be determined according to the particle size and the luminous intensity of the single LED lamp bead. The first annular side surface (303) is located at the bottommost end of the whole light path channel, so that the first annular light source (310) is lowest in position and closest to the plane where the object to be tested is located, the light of the first annular light source (310) can be projected to the object to be tested in the direction almost perpendicular to the central line (a), dark field illumination is provided for the object to be tested, and the contour contrast of the object to be tested in the test chart can be improved. The first annular light source (310) highlights the edge profile of the object under test when lit alone.

The second annular side (304) is remote from the bottom end opening compared to the first annular side (303), i.e. the second annular side (304) is higher compared to the first annular side (303), such that the second annular light source (320) is positioned higher. As shown in fig. 2, the included angle between the second annular side surface (304) and the central line (a) is larger than the included angle between the first annular side surface (303) and the central line (a), so that the second annular light source (320) can project onto the object to be tested at an angle different from that of the first annular light source (310), or the included angle between the light ray of the second annular light source (320) and the central line (a) is smaller than that between the light ray of the first annular light source (310) and the central line (a), so that the incident position of the light ray is offset from the side direction of the object to be tested to the surface, and the light ray of the second annular light source (320) is used for compensating the details of surface imaging of the object to be tested. The second annular light source (320) is closer to the central line (a) than the first annular light source (310), so that the second annular light source (320) is closer to the central line (a), the incidence angle of light rays of the second annular light source (320) is smaller, and interference of the first annular light source (310) on the light rays of the second annular light source (320) is avoided. Still further, as shown in fig. 3-4, the light emitting assembly further includes a light homogenizing plate (600), where the light homogenizing plate (600) is located at a side where light of the first annular light source (310) and/or the second annular light source (320) propagates, so that light of the first annular light source (310) and/or the second annular light source (320) is uniformly projected. Fig. 2 is a schematic diagram of the second annular side face (304) and the second annular light source (320) with the light homogenizing plate (600) removed, and fig. 3-4 are schematic diagrams with the light homogenizing plate (600). In one embodiment, a light homogenizing plate (600) is connected to the inner wall of the light path channel and is opposite to the second annular side (304) and the second annular light source (320), so as to uniformly project the light of the second annular light source (320). Because the second annular side (304) is closer to the central line (a) than the first annular side (303), the joint position of the second annular side (304) and the first annular side (303) forms a downward table top, one end of the light homogenizing plate (600) is connected to the table top, and the other end extends upwards. The light-homogenizing plate (600) covers the second annular light source (320), and the light-homogenizing plate (600) and the second annular light source (320) have a certain interval. In one embodiment, the second annular light source (320) is a plurality of LED light beads, i.e. point light sources, uniformly distributed around the second annular side (304). The number of the LED lamp beads is 48-60, and the number of the LED lamp beads can be determined according to the particle size and the luminous intensity of the single LED lamp bead. Light emitted by the LED lamp beads passes through the micro lens array of the light homogenizing plate (600), focuses through each subunit, forms the focus of array arrangement again, a plurality of beamlets after refocusing are overlapped with each other, the inhomogeneities of the beamlets cancel each other out, the light is finally enabled to be uniformly projected to an object to be tested, a uniform light environment is provided for the object to be tested, and interference caused by light spot contours is avoided. The edge contour of the object to be tested is still obvious when the second annular light source (320) is independently lightened, and the contour of the upper surface part of the object to be tested is simultaneously highlighted, so that the detail of the surface contour of the object to be tested is more abundant.

It is understood that, since the light of any LED light source propagates in a beam shape, the propagation direction of the light in this embodiment refers to the propagation direction of the center line or the optical axis of the light beam of the light source, or the propagation direction of the center line or the optical axis of the light beam of any LED light bead. The included angle between the light and the central line (a) refers to the included angle between the central line or the optical axis of the light beam of the light source and the central line (a), or the included angle between the central line of the light beam of any LED lamp bead or the optical axis of the light beam of the LED lamp bead and the central line (a). The center line (a) coincides with the optical axis of the image pickup device (400), that is, an axis passing through the lens center of the camera.

In a more specific embodiment, the included angle between the light of the first annular light source (310) and the central line (a) is greater than or equal to 70 degrees and less than or equal to 90 degrees, such as 80 degrees in particular, so that the light of the first annular light source (310) can be projected from the side direction of the object to be tested, and the edge contour detail is ensured to be highlighted. The included angle between the light of the second annular light source (320) and the central line (a) is greater than or equal to 50 degrees and less than or equal to 70 degrees, such as 60 degrees in particular, so that the projection direction of the light of the second annular light source (320) is closer to the upper side of the object to be tested, and the supplement of the contour details of the upper surface of the object to be tested is ensured.

In addition, in some other embodiments, the first annular light source (310) and the second annular light source (320) can be turned on simultaneously, when the first annular light source (310) and the second annular light source (320) are turned on simultaneously, the light rays of the first annular light source (310) and the second annular light source (320) are overlapped, the edge profile of the object to be tested is still obvious, and the partial profile of the upper surface of the object to be tested is also obvious simultaneously, so that the whole surface profile of the object to be tested is obvious, and the presentation content is richer.

In one embodiment, as shown in fig. 3, the annular light source assembly (300) further includes a third annular light source (330), the inner wall of the light path channel includes an arc-shaped top surface (302), the arc-shaped top surface (302) and the third annular light source (330) are both located at a side of the second annular light source (320) away from the detection stage (100), and the third annular light source (330) is closer to the detection stage (100) than the arc-shaped top surface (302). The arc-shaped top surface (302) gradually converges in a direction away from the detection table (100), the third annular light source (330) faces the arc-shaped top surface (302), and light rays of the third annular light source (330) are projected to the arc-shaped top surface (302) and reflected by the arc-shaped top surface (302) to provide uniform test light for an object to be tested.

In one embodiment, the inner wall of the optical path channel further comprises an annular table (305), the arc-shaped top surface (302) and the annular table (305) are both located on one side of the second annular light source (320) away from the detection table (100), and the arc-shaped top surface (302) is located above the annular table (305). The third annular light source (330) is arranged on the annular table (305), and the light of the third annular light source (330) is projected to the arc-shaped top surface (302) and reflected by the arc-shaped top surface (302) to provide uniform test light for the object to be tested. The arc-shaped top surface (302) can be a spherical surface, the top end of the arc-shaped top surface (302) surrounds the top end opening of the light path channel, the first end of the annular table (305) is connected with the bottom end of the arc-shaped top surface (302), the second end of the annular table (305) is connected with the second annular side surface (304), and then the inner wall of the complete light path channel is formed. The radius of the arc-shaped top surface (302) is more than or equal to 85 mm and less than or equal to 100 mm, and can be 94 mm specifically, so that the arc-shaped top surface can be suitable for detection of most objects to be tested. The third annular light source (330) is a plurality of LED lamp beads which are uniformly distributed on the periphery of the annular table (305), namely point light sources. The number of the LED lamp beads is 48-60, and the number of the LED lamp beads can be determined according to the particle size and the luminous intensity of the single LED lamp bead. The light ray direction of the third annular light source (330) is in an upward inclined direction, irradiates on the arc-shaped top surface (302), and the included angle between the light ray of the third annular light source (330) and the central line (a) is more than or equal to 50 degrees and less than or equal to 80 degrees, for example, 60 degrees can be adopted, so that the light ray of the third annular light source (330) can be projected to the middle area of the top end and the bottom end of the arc-shaped top surface (302). The arcuate top surface (302) may be covered with a diffuse reflective film. After the light of the third annular light source (330) is projected onto the arc-shaped top surface (302), the light is reflected by the arc-shaped top surface (302) and is projected downwards to the object to be tested. Because the arc-shaped top surface (302) is a spherical surface and can diffuse reflect light, the projected light can be uniformly projected to the area where the object to be tested is located in a large range.

When the third annular light source (330) is independently started, the acquired test chart is brighter, the illumination area of the object to be tested is uniform, and more characteristics of the object to be tested can be reflected in a concentrated mode.

In one embodiment, the third annular light source (330) comprises at least two dome sub-light sources, the first annular light source (310) and the second annular light source (320) each comprise at least two side sub-light sources, the number of the dome sub-light sources and the number of the side sub-light sources are the same, and the dome sub-light sources and the side sub-light sources are in one-to-one correspondence in a direction approaching the detection table (100).

The dome sub-light source and the side sub-light source may be individually controlled to be lit. In a specific embodiment, the inner wall of the optical path channel is divided into four subareas uniformly in the axial direction by a virtual dividing line, the third annular light source (330) comprises four dome sub-light sources, the first annular light source (310) and the second annular light source (320) respectively comprise four side sub-light sources, the four dome sub-light sources are respectively located in the four subareas, and the four side sub-light sources are respectively located in the four subareas. Any of the dome and side sub-light sources may include a plurality of LED beads, such as any of the side sub-light sources including 12 LED beads, any of the side sub-light sources or any of the dome sub-light sources may be individually controlled to light. The dome sub-light sources and the side sub-light sources in the four partition areas correspond to each other, and when the sub-light sources are controlled to be independently lightened, the corresponding dome sub-light sources and the side sub-light sources can be controlled to be lightened, so that multi-light source light superposition of one side part area of the object to be tested is realized, superposition test light is projected to the part area, and the feature of the object to be tested is realized.

In one embodiment, as shown in fig. 4-6, the optical test apparatus further includes a vertical light source assembly (500), the vertical light source assembly (500) is located between the annular light source assembly (300) and the image capturing device (400), the vertical light source assembly (500) includes a mounting plate (510) and a vertical light source, the mounting plate (510) has an opening (511), the opening (511) is opposite to a top opening of the optical path channel, the image capturing device (400) is opposite to the opening (511), the mounting plate (510) is perpendicular to the center line (a), and a center of the opening (511) is located on the center line (a). The vertical light source is arranged on the mounting plate (510) to provide test light for the object to be tested from a direction perpendicular to the detection table (100).

The mounting plate (510) covers the top opening of the light path channel and is fixedly connected with the shell (301) of the annular light source assembly (300). The image pickup device (400) is opposed to the opening (511). The annular light source assembly (300) provides test light for an object to be tested in an inclined direction, the vertical light source assembly (500) is located right above the object to be tested, and light rays of the vertical light source are projected onto an area where the object to be tested is located from top to bottom to provide a test light environment in the vertical direction for the object to be tested.

In a more specific embodiment, the vertical light source comprises a first vertical light source (520) and a second vertical light source (530), and the mounting plate (510) is provided with a first mounting groove (512) and a second mounting groove (513), and the first vertical light source (520) and the second vertical light source (530) are annular light sources. The first mounting groove (512) surrounds the opening (511) for one circle, and the second mounting groove (513) is positioned outside the first mounting groove (512) and surrounds the first mounting groove (512) for one circle. The first vertical light source (520) is arranged in the first mounting groove (512), and the second vertical light source (530) is arranged in the second mounting groove (513), so that the first vertical light source (520) and the second vertical light source (530) respectively provide test light for an object to be tested in different projection ranges.

The first vertical light source (520) is a plurality of LED lamp beads which are uniformly distributed in the first mounting groove (512) and are arranged around, namely point light sources. The number of the LED lamp beads is 12-15, and the number of the LED lamp beads can be determined according to the particle size and the luminous intensity of the single LED lamp bead. The second vertical light source (530) is a plurality of LED lamp beads uniformly distributed in the second mounting groove (513) along a circle, namely point light sources. The number of the LED lamp beads is 24-30, and the number of the LED lamp beads can be determined according to the particle size and the luminous intensity of the single LED lamp bead. The light rays of the first vertical light source (520) and the second vertical light source (530) are projected onto the object to be tested from top to bottom, the first vertical light source (520) provides bright field illumination with a small breadth for the object to be tested, the second vertical light source (530) provides bright field illumination with a large breadth for the object to be tested, and the breadth refers to the range of light projection light spots. Further, a light homogenizing plate (600) is further arranged in the first mounting groove (512) and the second mounting groove (513), and the light homogenizing plate (600) is opposite to the first vertical light source (520) and the second vertical light source (530) and is used for enabling light rays of the first vertical light source (520) and the second vertical light source (530) to be projected uniformly and avoiding interference generated by pearl outline of the LED lamp.

The first vertical light source (520) is illuminated in a small area near the center line (a) when the first vertical light source (520) is individually illuminated, and the light intensity is weak, and the first vertical light source (520) can be used in combination with other light sources. When the second vertical light source (530) is independently turned on, the object to be tested is illuminated in a larger area near the center line (a), and the light intensity is stronger, so that the edge profile of the object to be tested in the vertical direction can be highlighted.

In one embodiment, as shown in fig. 1 and 7, the optical test apparatus further includes a parallel light source assembly (700), the parallel light source assembly (700) is located between the image capturing device (400) and the annular light source assembly (300), and the parallel light source assembly (700) is used for providing parallel light for the object to be tested from a direction perpendicular to the detection table (100).

The parallel light source assembly (700) is also called as a coaxial light source, the parallel light source assembly (700) is opposite to an opening (511) on the mounting plate (510) and is used for providing uniform light vertical to a detection table (100) where an object to be tested is located, coaxial falling-type illumination can be provided for the object to be tested, so that a test chart is very uniform, shadow imaging is reduced, and reflection of the object to be tested can be avoided.

As shown in fig. 7, the parallel light source assembly (700) includes a housing (710), an array light source (720), a diffusion plate (730), and a semi-transparent lens (740). The shell (710) comprises an upper opening (701) and a lower opening (702), the upper opening (701) is opposite to the lower opening (702), the lower opening (702) is opposite to the opening (511), the array light source (720) is arranged on one side in the shell (710), light rays of the array light source (720) are parallel to the upper opening (701), the semi-transparent lens (740) is arranged in the shell (710) and opposite to the upper opening (701), the semi-transparent lens (740) and light rays of the array light source (720) form an included angle of 45 degrees, and the diffusion plate (730) is arranged between the semi-transparent lens (740) and the array light source (720). After passing through the diffusion plate (730) and the semi-transparent lens (740), the light of the array light source (720) is projected to the object to be tested in parallel, and after passing through the semi-transparent lens (740), the reflected light of the object to be tested is projected to the image capturing device (400) through the upper opening (701).

The shell (710) of the parallel light source assembly (700) is connected with the shell (301), the array light source (720) is an LED (light-emitting diode) lamp bead plate arranged in the shell (710), the size of an LED lamp bead area can be 40mm multiplied by 40mm, the LED lamp beads are arranged in a square array, and the number of the LED lamp beads in the transverse direction is 10-15, and the number of the LED lamp beads in the longitudinal direction is the same. The semi-transparent lens (740) is arranged at an angle of 45 degrees with the central line (a), and the semi-transparent lens (740) is a semi-transparent and semi-reflective beam-splitting lens. The light of the LED lamp beads is firstly diverged through the diffusion plate (730) and then projected to the semi-transparent lens (740), partial light is projected to the object to be tested through reflection of the semi-transparent lens (740), and the other part of light is projected to the semi-transparent lens (740) for segmentation through reflection of the shell (710) after passing through the semi-transparent lens (740). The semi-transparent lens (740) enables light to be projected to an object to be tested in the direction of the central line (a), reflected light of the rough part of the surface of the object to be tested is disordered, light reflected by the rough part and passing through the semi-transparent lens (740) is less, light reaching the image pickup device (400) from the rough part is less, a dark area is arranged on the rough part of the surface of the object to be tested in the test pattern, and the characteristic of the surface of the object to be tested is highlighted. And because the light is vertically projected to the object to be tested, the light reflected by the object to be tested vertically passes through the semi-transparent lens (740) and enters the image pickup device (400), thus eliminating reflection and avoiding reflection of the image pickup device (400) in the test chart. When the parallel light source assembly (700) is independently lightened, the surface flatness of the object to be tested is highlighted, and the surface of the object to be tested can be detected for bruise, scratch, crack, foreign matters and the like.

In addition, in some other embodiments, the third annular light source (330) and the parallel light source assembly (700) can be turned on simultaneously, and when the third annular light source (330) and the parallel light source assembly (700) are turned on simultaneously, the light rays of the third annular light source (330) and the parallel light source assembly (700) are overlapped, so that the whole surface of the object to be tested is more clear and complete, and the surface flatness is prominent and the brightness is higher.

In one embodiment, as shown in fig. 1, the support frame assembly (200) includes a support body (210), a first moving rod (220), a second moving rod (230) and a height adjusting assembly, the support body (210) is connected with the detection table (100), the height adjusting assembly is connected with the support body (210), one end of the first moving rod (220) is connected with the height adjusting assembly, the other end of the first moving rod (220) is connected with the annular light source assembly (300), one end of the second moving rod (230) is connected with the height adjusting assembly, and the other end of the second moving rod (230) is connected with the image capturing device (400). The height adjustment assembly is used for adjusting the heights of the first movable rod (220) and the second movable rod (230) so as to enable the annular light source assembly (300) and the image pickup device (400) to be close to or far away from the detection table (100).

The height adjusting component can specifically comprise a motor, a coupling, a screw, a sliding block and a slideway, wherein the slideway is paved on the supporting body (210) along the extending direction of the supporting body (210), such as extending in the vertical direction or extending in the direction approaching or separating from the detecting table (100). The motor is connected with the detection table (100), and the screw rod is connected with an output shaft of the motor through the coupler and is in threaded connection with the sliding block. The sliding block is movably connected with the slideway, and the first moving rod (220) and the second moving rod (230) are both connected with the sliding block. When the motor drives the screw rod to rotate, the sliding block is pushed to move in the direction close to or far away from the detection table (100) through the pushing action of the threads, and then the annular light source assembly (300), the image capturing device (400) and the vertical light source assembly (500) are driven to simultaneously close to or far away from the detection table (100), so that the detection heights of the annular light source assembly (300) and the vertical light source assembly (500) can be adjusted as required, and objects to be detected can be picked up and placed on the detection table (100) conveniently.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. An optical test device, comprising:

a detection table (100), wherein the detection table (100) is used for being connected with an object to be tested;

a support frame assembly (200), the support frame assembly (200) being connected to the detection station (100);

the annular light source assembly (300) comprises a first annular light source (310) and a second annular light source (320), the first annular light source (310) and the second annular light source (320) are connected with the support frame assembly (200) and are located above the detection table (100), and the second annular light source (320) is farther from the detection table (100) than the first annular light source (310), so that the first annular light source (310) and the second annular light source (320) provide test lights with different angles for the object to be tested;

the image pickup device (400) is connected with the support frame assembly (200), and is positioned at one side of the second annular light source (320) opposite to the detection table (100) and used for acquiring the image of the object to be detected.

2. The optical test device according to claim 1, wherein,

the annular light source assembly (300) further comprises a shell (301), the shell (301) is of a cavity structure comprising a light path channel, the light path channel penetrates through two ends of the shell (301), the shell (301) comprises a central line, the central line is perpendicular to the detection table (100), the shell (301) is symmetrical relative to the central line, the bottom opening of the light path channel is used for being opposite to the object to be detected, and the image capturing device (400) is opposite to the top opening of the light path channel;

the first annular light source (310) and the second annular light source (320) are both arranged on the inner wall of the light path channel, and the included angle between the light of the second annular light source (320) and the central line is smaller than the included angle between the light of the first annular light source (310) and the central line, so that the first annular light source (310) and the second annular light source (320) respectively provide test light for the object to be tested by different inclined angles.

3. The optical test device according to claim 2, wherein,

an included angle between the light of the first annular light source (310) and the central line is more than or equal to 70 degrees and less than or equal to 90 degrees;

An included angle between the light of the second annular light source (320) and the central line is greater than or equal to 50 degrees and less than or equal to 70 degrees.

4. The optical test device according to claim 2, wherein,

the annular light source assembly (300) further comprises a third annular light source (330), the inner wall of the light path channel comprises an arc-shaped top surface (302), the arc-shaped top surface (302) and the third annular light source (330) are both positioned on one side of the second annular light source (320) away from the detection table (100), and the third annular light source (330) is closer to the detection table (100) than the arc-shaped top surface (302);

the arc-shaped top surface (302) gradually converges in a direction away from the detection table (100), the third annular light source (330) faces the arc-shaped top surface (302), and light rays of the third annular light source (330) are projected to the arc-shaped top surface (302) and reflected by the arc-shaped top surface (302) to provide uniform test light for the object to be tested.

5. The optical test device according to claim 4, wherein,

the third annular light source (330) comprises at least two dome sub-light sources, the first annular light source (310) and the second annular light source (320) comprise at least two side sub-light sources, the number of the dome sub-light sources is the same as that of the side sub-light sources, and the dome sub-light sources and the side sub-light sources are in one-to-one correspondence in a direction close to the detection table (100).

6. The optical test device according to claim 4, wherein,

the arc-shaped top surface (302) is a spherical surface, and the radius of the arc-shaped top surface (302) is more than or equal to 85 mm and less than or equal to 100 mm;

and/or, an included angle between the light of the third annular light source (330) and the central line is greater than or equal to 50 degrees and less than or equal to 80 degrees.

7. The optical test device of claim 2, wherein the optical test device further comprises:

a vertical light source assembly (500), the vertical light source assembly (500) being located between the annular light source assembly (300) and the image pickup device (400), the vertical light source assembly (500) including a mounting plate (510) and a vertical light source, the mounting plate (510) having an opening (511), the opening (511) being opposite to a top end opening of the optical path channel, the image pickup device (400) being opposite to the opening (511), the mounting plate (510) being perpendicular to the center line, and a center of the opening (511) being located on the center line;

the vertical light source is arranged on the mounting plate (510) to provide test light for the object to be tested from a direction perpendicular to the detection table (100).

8. The optical test device according to claim 7, wherein,

The vertical light source comprises a first vertical light source (520) and a second vertical light source (530), a first mounting groove (512) and a second mounting groove (513) are formed in the mounting plate (510), and the first vertical light source (520) and the second vertical light source (530) are annular light sources;

the first mounting groove (512) surrounds the opening (511) for one circle, and the second mounting groove (513) is positioned outside the first mounting groove (512) and surrounds the first mounting groove (512) for one circle;

the first vertical light source (520) is disposed in the first mounting groove (512), and the second vertical light source (530) is disposed in the second mounting groove (513), so that the first vertical light source (520) and the second vertical light source (530) respectively provide test light for the object to be tested in different projection ranges.

9. The optical test device of claim 7, wherein the optical test device further comprises:

a light homogenizing plate (600), wherein the light homogenizing plate (600) is positioned on one side of the first annular light source (310) and/or the second annular light source (320) where light propagates, so that the light of the first annular light source (310) and/or the second annular light source (320) is uniformly projected;

and/or the light homogenizing plate (600) is positioned on one side of the light propagation of the vertical light source so as to uniformly project the light of the vertical light source.

10. The optical test device according to claim 7, wherein,

the first annular light source (310), the second annular light source (320) and/or the vertical light source comprise a plurality of point light sources which are evenly distributed circumferentially around the center line;

the point light source is an LED lamp bead.

11. The optical test device of claim 1, wherein the optical test device further comprises:

and the parallel light source assembly (700), wherein the parallel light source assembly (700) is positioned between the image capturing device (400) and the annular light source assembly (300), and the parallel light source assembly (700) is used for providing parallel light for the object to be tested by the direction perpendicular to the detection table (100).

12. The optical test device of claim 11, wherein the optical test device is configured to,

the parallel light source assembly (700) includes a housing (710), an array light source (720), a diffusion plate (730), and a semi-transparent lens (740);

the shell (710) comprises an upper opening (701) and a lower opening (702), the upper opening (701) is opposite to the lower opening (702), the lower opening (702) is opposite to the annular light source assembly (300), the array light source (720) is arranged on one side in the shell (710), the light rays of the array light source (720) are parallel to the upper opening (701), the semi-transparent lens (740) is arranged in the shell (710) and opposite to the upper opening (701), the semi-transparent lens (740) and the light rays of the array light source (720) form an included angle of 45 degrees, and the diffusion plate (730) is arranged between the semi-transparent lens (740) and the array light source (720);

The light of the array light source (720) passes through the diffusion plate (730) and the semi-transparent lens (740) and then is projected to the object to be tested in parallel, and the reflected light of the object to be tested passes through the semi-transparent lens (740) and then is projected to the image capturing device (400) through the upper opening (701).

13. The optical test device according to claim 1, wherein,

the support frame assembly (200) comprises a support main body (210), a first moving rod (220), a second moving rod (230) and a height adjusting assembly, wherein the support main body (210) is connected with the detection table (100), the height adjusting assembly is connected with the support main body (210), one end of the first moving rod (220) is connected with the height adjusting assembly, the other end of the first moving rod (220) is connected with the annular light source assembly (300), one end of the second moving rod (230) is connected with the height adjusting assembly, and the other end of the second moving rod (230) is connected with the image capturing device (400);

the height adjustment assembly is used for adjusting the heights of the first movable rod (220) and the second movable rod (230) so as to enable the annular light source assembly (300) and the image capturing device (400) to be close to or far away from the detection table (100).

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