CN210781136U - Projection device and three-dimensional measurement system - Google Patents
Projection device and three-dimensional measurement system Download PDFInfo
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- CN210781136U CN210781136U CN201922366597.2U CN201922366597U CN210781136U CN 210781136 U CN210781136 U CN 210781136U CN 201922366597 U CN201922366597 U CN 201922366597U CN 210781136 U CN210781136 U CN 210781136U
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Abstract
The embodiment of the utility model discloses projection arrangement and three-dimensional measurement system. The projection device comprises a light source, an image display chip, a projection lens and a screen; the light source is used for providing an illuminating light beam for the image display chip; the image display chip is used for providing a picture to be projected; the plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected in a straight line. The utility model discloses technical scheme intersects in a straight line through the plane that sets up the well vertical plane at image display chip place plane, projecting lens optical axis and screen place to make image display chip, projecting lens and screen satisfy the schem's law, realize that whole screen projection's image is clear, enlarge the projection depth of field, improve the reconstruction precision that 3D rebuilds.
Description
Technical Field
The embodiment of the utility model provides a relate to the projection technique, especially relate to a projection arrangement and three-dimensional measurement system.
Background
In the fields of 3D printing and 3D measurement, projection devices have a very important role because the definition of an image projected by a projection device directly affects the 3D printing or 3D measurement accuracy.
The projection device generally comprises an image display chip, a projection lens and a screen, wherein in the prior art, the image display chip, the projection lens and the screen are arranged in parallel, and because the display picture has different depths of field, the picture projected to the screen can only reach local definition, and the high-precision requirement required by 3D printing or 3D measurement cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a projection arrangement and three-dimensional measurement system to realize that whole screen projection's image is clear, enlarge the projection depth of field, improve the reconstruction precision that 3D rebuild.
In a first aspect, an embodiment of the present invention provides a projection apparatus, including a light source, an image display chip, a projection lens, and a screen;
the light source is used for providing an illuminating light beam for the image display chip;
the image display chip is used for providing a picture to be projected;
the plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected on a straight line.
Optionally, the projection lens is an image-space telecentric lens of a symmetric structure formed by nine lenses.
Optionally, the projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, which are sequentially arranged in a direction away from the image display chip;
the first lens is a positive focal length lens, the second lens to the fourth lens are negative focal length lenses, the fifth lens is a positive focal length lens, the sixth lens is a negative focal length lens, and the seventh lens to the ninth lens are positive focal length lenses.
Optionally, the first lens to the ninth lens are all glass spherical lenses.
Optionally, the projection lens further includes a diaphragm disposed between the fifth lens and the sixth lens.
Optionally, the image display device further comprises an illumination beam adjusting lens, and the illumination beam adjusting lens is located between the light source and the image display chip.
Optionally, the illumination beam adjusting lens includes a collimating lens, an aspheric lens, a fly-eye lens, a reflecting mirror, and an integrating lens;
the collimating lens, the aspheric lens, the fly-eye lens and the reflector are sequentially arranged along the direction far away from the light source, and the integrating lens is positioned on the emergent light path of the reflector.
Optionally, the image display chip includes a digital micromirror device DMD.
Optionally, the light source comprises a light emitting diode, LED.
In a second aspect, the embodiment of the present invention further provides a three-dimensional measurement system, which includes any one of the projection apparatuses.
The embodiment of the utility model provides a projection device, including light source, image display chip, projection lens and screen; the light source is used for providing an illuminating light beam for the image display chip; the image display chip is used for providing a picture to be projected; the plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected in a straight line. The plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected in a straight line, so that the image display chip, the projection lens and the screen meet the Schlemm's law, the projected image of the whole screen is clear, the projection depth of field is enlarged, and the reconstruction precision of 3D reconstruction is improved.
Drawings
FIG. 1 is a schematic diagram of a projection apparatus in the prior art;
fig. 2 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a projection lens according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating chromatic aberration correction of a projection lens according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating distortion correction of a projection lens according to an embodiment of the present invention;
fig. 6 is a schematic graph of an optical transfer function MTF of a projection lens according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another projection apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an illumination beam adjusting lens according to an embodiment of the present invention;
fig. 9 is a light spot uniformity effect diagram output by the illumination beam adjusting lens according to the 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present invention are described in terms of the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural diagram of a projection apparatus in the prior art. Referring to fig. 1, the projection apparatus mainly includes an image display chip 1, a projection lens 2 and a screen 3, which are arranged in parallel, wherein an image displayed by the image display chip 1 is projected onto the screen 3 after being amplified by the projection lens 2, and because the depths of field at different positions are different, the image received by the screen 3 can only reach local definition, thereby reducing the 3D reconstruction precision and increasing the 3D test error.
In order to solve the above problem, an embodiment of the present invention provides a projection apparatus. Fig. 2 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention. Referring to fig. 2, the projection apparatus provided in this embodiment includes a light source 10, an image display chip 20, a projection lens 30, and a screen 40; the light source 10 is used for providing an illumination beam for the image display chip 20; the image display chip 30 is used for providing a picture to be projected; the plane a of the image display chip 20, the perpendicular plane b of the optical axis of the projection lens 30 and the plane c of the screen 40 intersect on a straight line.
Wherein the light source 10 is used to provide a projected illumination beam, the light source may alternatively be a light emitting diode, LED. The LED has the advantages of small volume, long service life, high brightness, low power consumption and the like, and is very suitable to be used as a light source of a display device or a projection device. The image display chip 20 is configured to provide a display image to be projected, and optionally, the image display chip 20 may be a digital micromirror device DMD, which may be selected according to actual conditions during implementation. When the plane a where the image display chip 20 is located, the vertical plane b of the optical axis of the projection lens 30 and the plane c where the screen 40 is located intersect in a straight line, the three satisfy the schem's law, which was proposed by the siedol Scheimpflug (Theoder Scheimpflug) at the earliest, and is used in the field of photography.
The positional relationship of the image display chip 20, the projection lens 30, and the screen 40 may be determined as follows: determining the image side working distance of the projection lens 30, namely determining the position of the image display chip 20 under the condition that the magnification and the object side working distance of the projection lens 30 are known; then, the projection lens 30 intersects the display surface of the projection image plane (screen 40) on a straight line, and the angle of the screen 40 is derived.
According to the technical scheme, the plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected in a straight line, so that the image display chip, the projection lens and the screen meet the Schlemm's law, the projected image of the whole screen is clear, the projection depth of field is expanded, and the reconstruction accuracy of 3D reconstruction is improved.
On the basis of the above technical solution, fig. 3 shows the embodiment of the present invention is a schematic structural diagram of a projection lens. Referring to fig. 3, the projection lens is an image-side telecentric lens with a symmetric structure formed by nine lenses. Optionally, the projection lens includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, a sixth lens 36, a seventh lens 37, an eighth lens 38, and a ninth lens 39, which are sequentially arranged in a direction away from the image display chip; the first lens 31 is a positive focal length lens, the second lens 32 to the fourth lens 34 are negative focal length lenses, the fifth lens 35 is a positive focal length lens, the sixth lens 36 is a negative focal length lens, and the seventh lens 37 to the ninth lens 39 are positive focal length lenses.
In the projection lens of the embodiment, the first lens 31 is a positive focal length meniscus lens for eliminating spherical aberration, the second lens 32 to the ninth lens 39 form a double-gauss structure, the second lens 32 to the fourth lens 34 are all negative focal length lenses, and the fifth lens 35 is a positive focal length lens; the sixth lens 36 is a negative focal length lens and the seventh lens 37 to the ninth lens 39 are positive focal length lenses, and such a symmetrical structure is advantageous in eliminating distortion, chromatic aberration, and higher order aberration, and achieving a transfer function close to the diffraction limit. Fig. 4 is a schematic diagram illustrating chromatic aberration correction of a projection lens according to an embodiment of the present invention, and as can be seen from fig. 4, chromatic aberration correction of the projection lens is less than 10 μm. Fig. 5 is a schematic diagram illustrating distortion correction of a projection lens according to an embodiment of the present invention, and as can be seen from fig. 5, the distortion correction of the lens is less than 0.1%. Fig. 6 is a graph schematically showing the MTF of the optical transfer function of the projection lens according to an embodiment of the present invention, and as can be seen from fig. 6, when the spatial frequency is 184 line pairs/mm, the MTF is greater than 0.5, the image space telecentricity is less than 0.017 °, the central field diffuse spot is 1/3 of the airy spot, the edge field diffuse spot is 4/5 of the airy spot, and the MTF is close to the diffraction limit.
The projection lens has the advantages of small appearance structure and high resolution, achieves the purpose of clear imaging of large projection breadth, solves the problem that a measuring device shields a high object, and realizes the large depth of field measurement of the object. The measurement precision is improved, and the method is a standard configuration of a high-precision 3D measuring instrument.
Optionally, the first lens 31 to the ninth lens 39 are all glass spherical lenses. The glass spherical lens is easy to process, and is beneficial to reducing the cost of the projection device.
Optionally, with continuing reference to fig. 3, the projection lens provided in this embodiment further includes a diaphragm 310 disposed between the fifth lens 35 and the sixth lens 36. The diaphragm 310 is used to adjust the amount of light passing through the projection lens.
Fig. 7 is a schematic structural diagram of another projection apparatus according to an embodiment of the present invention. Referring to fig. 7, optionally, the projection apparatus provided in this embodiment further includes an illumination beam adjusting lens 50, where the illumination beam adjusting lens 50 is located between the light source 10 and the image display chip 20.
It is understood that the illumination light beam adjusting lens 50 is used to optimize the illumination light beam for specific performance, such as collimation, homogenization, etc., and the illumination light beam adjusting lens 50 provided by the present embodiment can output the light beam with optical performance of parallelism less than 9 ° and energy distribution uniformity greater than 95%.
Fig. 8 is a schematic structural diagram of an illumination beam adjusting lens according to an embodiment of the present invention, referring to fig. 8, optionally, the illumination beam adjusting lens includes a collimating lens 51, an aspheric lens 52, a fly-eye lens 53, a reflector 54, and an integrator lens 55; the collimator lens 51, the aspherical lens 52, the fly-eye lens 53, and the reflecting mirror 54 are arranged in this order in a direction away from the light source, and the integrator lens 55 is positioned on an outgoing light path of the reflecting mirror 54.
In the illumination beam adjusting lens provided in this embodiment, the illumination beam emitted from the light source is adjusted into a parallel beam through the collimating lens 51 and the aspheric lens 52, and the parallel angle is less than or equal to 5 mrad. Wherein the rise formula of the aspheric lens satisfies:
where c is the curvature (radius), r is the radial coordinate in units of lens length, k is the conic coefficient, a1～a8Is a high-order term coefficient. The refraction angle of the aspheric surface to the edge light beam is larger than that of the central light beam, so that the divergent light beam of the light source is optimized to be a parallel light beam.
The fly eye lens 53 is used for dividing the parallel light beam output by the aspheric lens 52 into a plurality of parallel small light beams with equal areas, performing fourier convolution transformation through the integrating lens 55, distributing the energy of the central light beam to the edge light beams, achieving homogenization of the energy of the whole light spot, and outputting the parallel light beam with a parallel angle smaller than 9 degrees. The length-width ratio of the fly-eye lens 53 is consistent with that of the image display chip, so that the highest energy output utilization rate is ensured.
Fig. 9 is a diagram illustrating the effect of uniformity of light spots output by the illumination light beam adjusting lens according to the present embodiment, and the illumination light beam adjusting lens can output light beams with parallelism less than 9 ° and energy distribution uniformity greater than 95%.
Compared with the projection screen image of the traditional projection device which can only be locally clear, the projection device based on the Samm's law can make the whole projection screen image clear and enlarge the projection depth of field; the clear projection breadth projected by the projection device increases the measurement depth of field of 3D measurement, and eliminates the measurement blind spot caused by the shadow shielding of an object; when the projection device is matched with an acquisition system, the acquisition breadth of the acquisition system is increased, the effective point cloud number is increased, and the reconstruction precision of 3D reconstruction can be effectively improved.
The embodiment of the utility model provides a still provide a three-dimensional measurement system, including the arbitrary projection arrangement that above-mentioned embodiment provided. Because the embodiment of the utility model provides a three-dimensional measurement system includes the arbitrary projection arrangement that above-mentioned embodiment provided, it has the same or corresponding technological effect with projection arrangement.
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 changes, rearrangements 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 (10)
1. A projection device is characterized by comprising a light source, an image display chip, a projection lens and a screen;
the light source is used for providing an illuminating light beam for the image display chip;
the image display chip is used for providing a picture to be projected;
the plane where the image display chip is located, the perpendicular plane of the optical axis of the projection lens and the plane where the screen is located are intersected on a straight line.
2. The projection apparatus of claim 1, wherein the projection lens is an image-side telecentric lens having a symmetric structure formed by nine lenses.
3. The projection device of claim 2, wherein the projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are arranged in sequence along a direction away from the image display chip;
the first lens is a positive focal length lens, the second lens to the fourth lens are negative focal length lenses, the fifth lens is a positive focal length lens, the sixth lens is a negative focal length lens, and the seventh lens to the ninth lens are positive focal length lenses.
4. The projection apparatus of claim 3, wherein the first lens to the ninth lens are all glass spherical lenses.
5. The projection apparatus of claim 3, wherein the projection lens further comprises a diaphragm disposed between the fifth lens and the sixth lens.
6. The projection device of claim 1, further comprising an illumination beam adjustment lens positioned between the light source and the image display chip.
7. The projection apparatus of claim 6, wherein the illumination beam conditioning lens comprises a collimating lens, an aspheric lens, a fly-eye lens, a mirror, and an integrator lens;
the collimating lens, the aspheric lens, the fly-eye lens and the reflector are sequentially arranged along the direction far away from the light source, and the integrating lens is positioned on the emergent light path of the reflector.
8. The projection device of claim 1, wherein the image display chip comprises a Digital Micromirror Device (DMD).
9. The projection device of claim 1, wherein the light source comprises a Light Emitting Diode (LED).
10. A three-dimensional measurement system comprising the projection apparatus of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922366597.2U CN210781136U (en) | 2019-12-25 | 2019-12-25 | Projection device and three-dimensional measurement system |
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| CN201922366597.2U CN210781136U (en) | 2019-12-25 | 2019-12-25 | Projection device and three-dimensional measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111031300A (en) * | 2019-12-25 | 2020-04-17 | 博众精工科技股份有限公司 | Projection device and three-dimensional measurement system |
| CN114089511A (en) * | 2021-11-26 | 2022-02-25 | 湖北久之洋红外系统股份有限公司 | Very wide band transmission type telescopic optical system |
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2019
- 2019-12-25 CN CN201922366597.2U patent/CN210781136U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111031300A (en) * | 2019-12-25 | 2020-04-17 | 博众精工科技股份有限公司 | Projection device and three-dimensional measurement system |
| CN111031300B (en) * | 2019-12-25 | 2024-10-11 | 博众精工科技股份有限公司 | Projection device and three-dimensional measurement system |
| CN114089511A (en) * | 2021-11-26 | 2022-02-25 | 湖北久之洋红外系统股份有限公司 | Very wide band transmission type telescopic optical system |
| CN114089511B (en) * | 2021-11-26 | 2024-01-16 | 湖北久之洋红外系统股份有限公司 | Very wide band transmission type telescopic optical system |
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