CN209748728U - drawing card testing board and lens resolving power testing device - Google Patents
drawing card testing board and lens resolving power testing device Download PDFInfo
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- CN209748728U CN209748728U CN201920906958.5U CN201920906958U CN209748728U CN 209748728 U CN209748728 U CN 209748728U CN 201920906958 U CN201920906958 U CN 201920906958U CN 209748728 U CN209748728 U CN 209748728U
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Abstract
an embodiment of the utility model provides a picture card is surveyed test panel and camera lens analytic power testing arrangement relates to the camera lens and detects the technique. The embodiment of the utility model provides a drawing card surveys test panel, include: the bearing plate is characterized in that the surface of the bearing plate is a cylindrical surface; the graphic card comprises a test pattern, and is attached and fixed on the surface of one side of the concave part of the bearing plate. The embodiment of the utility model provides a picture card surveys test panel and camera lens analytic power testing arrangement to the field of camera lens is bent when the simple design that realizes surveying test panel through the picture card comes anti-compensation to closely shoot, thereby improves the detection precision of camera lens analytic ability.
Description
Technical Field
The embodiment of the utility model provides a relate to the camera lens detection technology, especially relate to a picture card surveys test panel and camera lens analytic power testing arrangement.
Background
the testing of lens resolving power has been an important testing technique in the field of optical testing, especially in the field of lens product quality. The lens resolution refers to the ability of the lens to resolve the details of the subject. With the popularization of lenses, there are more and more inspection means for lens resolving power. At present, the mainstream inspection means in the market includes plane chart card real shooting and MTF (modulation transfer function) inspection, wherein the plane chart card real shooting means that a tester reads a target paper image, and judges the lens resolving power according to whether the image of a corresponding space frequency line pair can be resolved, for example, if the image to be resolved is 500 line pairs per millimeter, the image of the 500 line pairs can be resolved, the lens is proved to be qualified, and if the image of the 500 line pairs cannot be resolved, the lens is proved to be unqualified, so that the resolving power of the lens to be tested is expressed. The MTF test is to realize the detection of lens resolving power by reading the MTF curve of the target paper image through a machine.
Due to the fact that the lens has field curvature, judgment on the lens resolving capability is inaccurate. This is a problem to be solved by the person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a picture card surveys test panel and camera lens analytic power testing arrangement to the field of camera lens is bent when the simple design that realizes surveying test panel through the picture card comes anti-compensation to closely shoot, thereby improves the detection precision of camera lens analytic ability.
In a first aspect, an embodiment of the present invention provides a card testing board, including:
the bearing plate is characterized in that the surface of the bearing plate is a cylindrical surface;
The graphic card comprises a test pattern, and is attached and fixed on the surface of one side of the concave part of the bearing plate.
Optionally, the cylindrical surface is a cylindrical surface.
Optionally, the cylinder has a directrix that is elliptical, parabolic or hyperbolic.
Optionally, the test pattern includes a plurality of black lines and white lines arranged in parallel, the black lines and the white lines are arranged at intervals one by one, and both the black lines and the white lines extend along a straight bus of the cylindrical surface; or the black lines and the white lines extend along the directrix of the cylindrical surface.
In a second aspect, an embodiment of the present invention provides a lens analysis force testing apparatus, including the graphic card testing board of the first aspect;
The lens to be detected is positioned in the direction of one side of the concave part of the bearing plate;
The lens analysis force testing device further comprises an image receiving device located on one side, away from the graphic card testing board, of the lens to be tested.
optionally, the image receiving device includes a plurality of pixels arranged in an array in a horizontal direction and a vertical direction, and the number of the pixels in one row arranged in the horizontal direction is greater than the number of the pixels in one row arranged in the vertical direction; the straight generatrix of the cylindrical surface extends in the vertical direction.
Optionally, the test board further comprises at least one light source located between the lens to be tested and the graphic card test board.
Optionally, the plurality of light sources are symmetrically distributed about the card test board, and the plurality of light sources arranged in a row along the vertical direction are uniformly distributed.
The embodiment of the utility model provides an among the drawing card testing board, the loading board that bears the drawing card is set up to the cylindricality form, and the surface of loading board is the cylinder, and the drawing card is attached to be fixed to the surface of loading board to the drawing card also has the crooked of cylindricality form, thereby makes the drawing card no longer be a plane, but the curved surface of a cylindricality form. The field curvature of the lens during close-range shooting is compensated reversely through the simple design of the graphic card test board, infinite shooting is simulated, and therefore the detection precision of the lens resolving power is improved. The embodiment of the utility model provides a graph card surveys test panel can compensate the field curvature of all camera lenses, has extensive suitability, and the design simple structure of cylinder form, has reduced the test cost, has improved the degree of accuracy that the test was judged.
Drawings
FIG. 1 is a defocus diagram of a planar image at infinity taken through a lens to be measured;
FIG. 2 is a defocused view of a planar image at a short distance taken through a lens to be measured;
FIG. 3 is a schematic diagram of a card testing board according to an embodiment of the present invention;
Fig. 4 is a front view of a graphic card according to an embodiment of the present invention;
fig. 5 is a front view of another graphics card according to an embodiment of the present invention;
FIG. 6 is an out-of-focus view of the card-coating test board shown in FIG. 3 at a close range taken through a lens to be tested;
fig. 7 is a schematic view illustrating a lens analysis force testing apparatus according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of an image receiving device according to an embodiment of the present invention;
fig. 9 is a partial structural top view of another lens analysis force testing apparatus according to an embodiment of the present invention;
Fig. 10 is a partial structure front view of another lens analysis force testing apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a defocus diagram of a planar image at infinity captured by a lens to be measured, and fig. 2 is a defocus diagram of a planar image at a close distance captured by the lens to be measured, and referring to fig. 1 and 2, the abscissa is the distance and the ordinate is the MTF (modulation transfer function). In practical applications, most of the lenses are used for shooting at a long distance, and in order to better fit practical use conditions when detecting the resolution strength (i.e. resolving power, or resolving power) of the lenses, infinite shooting needs to be simulated. As shown in fig. 1, when a planar image at infinity is shot through the lens to be measured, the peak is located at the position of 0mm, and there is no field curvature. In the actual production and the test process of the lens, in order to save the field cost, the real shooting detection of the lens is generally carried out under the close range, and because the lens to be detected has field curvature, the intersection point of the whole light beam is not superposed with the ideal image point, so that the whole image plane is a curved surface under the close range. Therefore, the curvature of field of the planar image (i.e. the image card) captured in close range is large, which results in inaccurate determination of the resolution of the lens to be measured. When the camera is used for close-range shooting, the field curvature of the lens is increased compared with that of the lens at infinity, the phenomenon that the definition of a central image is unchanged, and the quality of an edge image is blurred compared with that of the lens at infinity is caused, so that the detection result is inaccurate. As can be seen from fig. 2, when the planar image at a short distance is shot through the lens to be measured, the peak is located at 0.01mm, and the curvature of field is 0.01mm (i.e., 10 μm). The embodiment of the utility model provides an in closely locate to indicate the distance within several meters distance, remote department indicates the distance beyond several tens meters widely.
Fig. 3 is a schematic view of a card testing board according to an embodiment of the present invention, referring to fig. 3, the card testing board 10 includes a supporting board 11 and a card 12. The surface of the carrier plate 11 is cylindrical. The cylindrical surface is a curved surface formed by parallel movement of straight lines along a fixed curve, namely a curved surface formed by parallel movement of a moving straight line along a fixed curve, wherein the moving straight line is called a straight generatrix 111 of the cylindrical surface, and the fixed curve is called a directrix 112 of the cylindrical surface. The resulting cylinder is referred to as a cylinder when the directrix 112 is a circle. The graphic card 12 includes a test pattern, and the test pattern on the graphic card 12 can be shot by the lens to be tested to obtain a test image, and the resolving power of the lens to be tested can be obtained according to the test image. The graphic card 12 is attached to the surface of the concave side of the bearing plate 11, and the bending direction of the graphic card 12 is the same as the bending direction of the bearing plate 11. The size and the front view shape of the outer contour of the graphic card 12 can be determined according to the requirement, as long as the graphic card 12 is attached and fixed on the surface of the concave side of the bearing plate 11. In some embodiments, the shape of the graphics card 12 may conform to the shape of the surface of the carrier plate 11. For example, the graphics card 12 is cylindrical in shape.
The embodiment of the utility model provides an among the drawing card testing board, the loading board that bears the drawing card is set up to the cylindricality form, and the surface of loading board is the cylinder, and the drawing card is attached to be fixed to the surface of loading board to the drawing card also has the crooked of cylindricality form, thereby makes the drawing card no longer be a plane, but the curved surface of a cylindricality form. The field curvature of the lens during close-range shooting is compensated reversely through the simple design of the graphic card test board, infinite shooting is simulated, and therefore the detection precision of the lens resolving power is improved. The embodiment of the utility model provides a graph card surveys test panel can compensate the field curvature of all camera lenses, has extensive suitability, and the design simple structure of cylinder form, has reduced the test cost, has improved the degree of accuracy that the test was judged.
Alternatively, referring to fig. 3, the cylindrical surface is a cylindrical surface. The alignment line 112 of the cylindrical surface is a circular arc, and the manufacturing process is simple. And when the cylindrical surface is a cylindrical surface, the effect of reversely eliminating the curvature of field of the lens during short-distance shooting is better, and the method is a preferred implementation mode.
Alternatively, referring to fig. 3, the cylinder directrix 112 is elliptical, parabolic, or hyperbolic. The corresponding cylindrical surfaces are respectively an elliptical surface, a parabolic surface and a hyperbolic surface. In other embodiments, the cylindrical directrix 112 may have other shapes as long as the cylindrical directrix 112 is a curve.
Fig. 4 is a front view of the graphic card according to the embodiment of the present invention, as shown in fig. 3 and fig. 4, the test pattern on the graphic card 12 includes a plurality of black lines 121 and white lines 122 arranged in parallel, the black lines 121 and the white lines 122 are arranged at intervals one by one, and the black lines 121 and the white lines 122 form a line pair 120. The black lines 121 and the white lines 122 each extend along a straight generatrix 111 of the cylinder. The black lines 121 and the white lines 122 may have the same line width.
Illustratively, the straight generatrix 111 of the cylindrical surface extends in the vertical direction (Z-axis direction). The black lines 121 and the white lines 122 extend in the vertical direction. The black lines 121 and the white lines 122 are straight lines. In other embodiments, the straight generatrix 111 of the cylindrical surface may also extend along the X-axis direction or the Y-axis direction, which is not limited by the embodiment of the present invention.
fig. 5 is a front view of another graphic card provided in an embodiment of the present invention, and as shown in fig. 3 and fig. 5, a test pattern on the graphic card 12 includes a plurality of black lines 121 and white lines 122 arranged at intervals, the black lines 121 and the white lines 122 are arranged at intervals one by one, and the black lines 121 and the white lines 122 form a line pair 120. The black lines 121 and white lines 122 each extend along the cylindrical directrix 112. The black lines 121 and the white lines 122 are both curved lines, and the shapes of the black lines 121 and the white lines 122 are identical to the shape of the directrix 112.
illustratively, cards 12 with vertical lines (e.g., black lines 121 and white lines 122 shown in FIG. 4) or cards 12 with horizontal lines (e.g., black lines 121 and white lines 122 shown in FIG. 5) may be affixed to the corresponding fields of view, e.g., the center field of view and the 0.7 field of view. Where the central field of view refers to the field of view at the center of the image and the 0.7 field of view refers to the field of view at a distance of 0.7 times higher. In general, cards 12 with horizontal lines detect images in the sagittal direction, while cards 12 with vertical lines detect images in the midday direction. The size of the graphics cards 12 in different fields of view is different, so the placement position and line width of the graphics cards 12 can be designed according to practical situations, for example, the graphics cards 12 are placed in the central field of view, and the size of the graphics cards in the central field of view can be designed to be 500lp/mm, that is, the spatial frequency of the graphics cards in the central field of view can be designed to be 500 lines per millimeter. By placing the graphic card 12 in the 0.7 field of view, the 0.7 field of view card specification may be designed to be 300lp/mm, that is, the 0.7 field of view card spatial frequency may be designed to be 300 line pairs per millimeter.
It should be noted that in other embodiments, the test patterns provided on the graphic card 12 may also include other patterns, such as a circle or an "L" shaped pattern. The arrangement of the graphic cards 12 is diversified, the corresponding specified view field is found according to the specification requirement, and the designed graphic cards 12 are attached to the positions of the bearing plates 11 corresponding to the specification requirement. For example, when the distance between the center of the lens to be measured and the center of the graphic card 12 on the cylindrical surface is 1.5 m, the allowable range of the field curvature can be reached, and the graphic card 12 can be respectively attached to the central view field and the 0.7 view field corresponding to the lens to be measured. In addition, the distance is not fixed, and the distance between the lens to be measured and the center of the graphic card 12 with the cylindrical surface can be automatically adjusted according to the size of the field and the size range of the graphic card 12 with the cylindrical surface within the range allowed by the size of the field, so that the space position is saved, and the field cost is saved.
figure 6 is through the camera lens that awaits measuring shoot closely locate the out-of-focus picture of scribbling the card survey test panel shown in figure 3, refer to figure 6, process the utility model provides a back is located 0.002mm department to the wave crest after the field of camera lens was bent when the anti-compensation was shot closely to the picture card survey test panel, the field is bent to 0.002mm (2 mu m promptly). Therefore, the curvature of field of the lens is well corrected by the graphic card test board during close-range shooting, and the detection precision of the lens resolving power is improved.
Fig. 7 is a schematic view of a lens analysis force testing device according to an embodiment of the present invention, referring to fig. 3 and 7, the lens analysis force testing device includes the graphic card testing board 10 in the above embodiment. The lens 20 to be tested is located in the direction of the concave side of the bearing plate 11. The lens resolution testing apparatus further includes an image receiving device 30 located on a side of the lens 20 to be tested away from the graphic card testing board 10. The image receiving device 30 is used for receiving an image of the test pattern on the graphic card 12 photographed through the lens 20 to be tested.
The embodiment of the utility model provides a camera lens analytic power testing arrangement includes the picture card in the above-mentioned embodiment and surveys test panel to have the advantage that above-mentioned picture card surveyed test panel, survey test panel's simple design promptly through the picture card and come the field curvature of camera lens when anti-compensation closely shoots, the infinitely distant shooting of simulation, thereby improve the detection precision of camera lens analytic ability.
fig. 8 is a schematic diagram of an image receiving device according to an embodiment of the present invention, referring to fig. 3, fig. 7 and fig. 8, the image receiving device 30 includes a plurality of pixels 300 arranged in an array along a horizontal direction (X-axis direction) and a vertical direction (Z-axis direction), and the number of pixels 300 in one row arranged in the horizontal direction is greater than the number of pixels 300 in one row arranged in the vertical direction. The cylindrical straight generatrix 111 extends in the vertical direction. I.e. the cylindrical surface is placed vertically. The embodiment of the utility model provides an in, the horizontal bending surface of adoption compares in vertical bending surface facilitate the use more and puts. In addition, since the meridional field curvature on the image plane is larger than the sagittal field curvature, the meridional field curvature is a main part of the field curvature. Therefore, the horizontal curved surface can be used to correct most of the curvature of field on the basis of a simple structure. The horizontal curved surface means that the directrix of the cylindrical surface is curved in the XY plane, and the straight generatrix of the cylindrical surface extends along the Z-axis direction. The vertical curved surface means that the directrix of the cylindrical surface is curved in the XZ plane or the YZ plane, and the straight generatrix of the cylindrical surface extends in the Y-axis direction or the X-axis direction. The meridional field curvature refers to field curvature in the horizontal direction, and the sagittal field curvature refers to field curvature in the vertical direction.
Illustratively, referring to fig. 3, 7, and 8, the image receiving device 30 is a CMOS (complementary metal oxide semiconductor) board whose pixels 300 are a square, for example, a square of 2um × 2 um. The number of picture elements 300 in the horizontal direction and the vertical direction of the whole cmos board are different. For example, a so-called 1920 x 1080, i.e. 1920 pixels 300 in a horizontal row and 1080 pixels 300 in a vertical row, results in a full cmos board with an aspect ratio of 16: 9.
fig. 9 is a partial structure plan view of another lens analysis force testing device provided in the embodiment of the present invention, fig. 10 is a partial structure elevation view of another lens analysis force testing device provided in the embodiment of the present invention, referring to fig. 7, fig. 9 and fig. 10, the lens analysis force testing device further includes at least one light source 40, and the light source 40 is located between the lens 20 to be tested and the graphic card testing board 10. If the light source 40 is not provided and the photographing is performed only by the ambient light illuminance, the illuminance of the graphic card 12 in each direction is not uniform, and the detection result is inaccurate. The embodiment of the utility model provides an in, through setting up light source 40, the light that light source 40 sent is irradiated to graphic card 12 on, compensates the illuminance on graphic card 12 surface to improve graphic card 12 surface illuminance homogeneity, improved the accuracy of test.
Alternatively, referring to fig. 7, 9 and 10, the plurality of light sources 40 are symmetrically distributed about the card test board 10, and the plurality of light sources 40 arranged in a row in the vertical direction are uniformly distributed. The plurality of light sources 40 are symmetrically disposed on both sides of the card test board 10, and two adjacent light sources 40 in the plurality of light sources 40 disposed in a row are disposed to have the same distance, so that the uniformity of the surface illumination of the card 12 is further improved, and the test accuracy is improved.
For example, the light sources 40 may be fixed to two side edges of the supporting plate 11 extending in the vertical direction, so as to reduce the difficulty in fixing the light sources 40 and increase the uniformity of the illumination of the graphic card 12. The light sources 40 on both sides can also realize self-regulation of the surface illumination of the graphic card, thereby ensuring that the surface illumination of the graphic card 12 is uniform and within a specified range.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. A test board for a graphics card, comprising:
The bearing plate is characterized in that the surface of the bearing plate is a cylindrical surface;
the graphic card comprises a test pattern, and is attached and fixed on the surface of one side of the concave part of the bearing plate.
2. The test board of claim 1, wherein the cylindrical surface is cylindrical.
3. The test board of claim 1, wherein the cylinder has a directrix that is elliptical, parabolic or hyperbolic.
4. the test board according to claim 1, wherein the test pattern comprises a plurality of black lines and white lines arranged in parallel, the black lines and the white lines are arranged at intervals one by one, and both the black lines and the white lines extend along the straight generatrices of the cylindrical surface; or the black lines and the white lines extend along the directrix of the cylindrical surface.
5. A lens resolution test device, comprising the graphic card test board according to any one of claims 1 to 4;
The lens to be detected is positioned in the direction of one side of the concave part of the bearing plate;
The lens analysis force testing device further comprises an image receiving device located on one side, away from the graphic card testing board, of the lens to be tested.
6. The lens resolving power testing apparatus according to claim 5, wherein the image receiving device includes a plurality of pixels arrayed in a horizontal direction and a vertical direction, and the number of the pixels in one row arranged in the horizontal direction is greater than the number of the pixels in one row arranged in the vertical direction; the straight generatrix of the cylindrical surface extends in the vertical direction.
7. The apparatus for testing lens resolution according to claim 5, further comprising at least one light source disposed between the lens under test and the graphic card test board.
8. The lens resolving power testing apparatus of claim 7, wherein the plurality of light sources are symmetrically distributed about the graphic card testing board, and the plurality of light sources arranged in a row along a vertical direction are uniformly distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920906958.5U CN209748728U (en) | 2019-06-17 | 2019-06-17 | drawing card testing board and lens resolving power testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920906958.5U CN209748728U (en) | 2019-06-17 | 2019-06-17 | drawing card testing board and lens resolving power testing device |
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| CN209748728U true CN209748728U (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191337A (en) * | 2019-06-17 | 2019-08-30 | 东莞市宇瞳光学科技股份有限公司 | A kind of graph card test board, camera lens parsing force test device and test method |
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2019
- 2019-06-17 CN CN201920906958.5U patent/CN209748728U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191337A (en) * | 2019-06-17 | 2019-08-30 | 东莞市宇瞳光学科技股份有限公司 | A kind of graph card test board, camera lens parsing force test device and test method |
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