TWM479406U - Projection device of three dimensional profile scanner - Google Patents

Description

Projection device for 3D contour scanner

This creation is about a projection device for a three-dimensional contour scanner that is extremely small in size but at a lower cost.

In order to improve the quality of the measurement or inspection work, and to be faster and more precise, the overall data or professional related data of a three-dimensional object is preferably carried out in a stereo scanning mode to obtain a clear stereoscopic image profile. Calculating and storing all relevant information is currently the best way.

Generally, the three-dimensional scanning technique is used to solve the topography of the surface of the object. The coded structured light pattern (Patterns) is considered to be the most reliable technology; please refer to Fig. 4, the so-called "structural light pattern 70" refers to a kind of Specially designed, light with a specific pattern, from the simplest lines, faces, even to more complex graphics such as grids, the basic principle is to project structured light onto a three-dimensional object or scene to be scanned, and from a Or taking a plurality of angles of view; since the pattern has been encoded, when the structured light pattern is projected onto the three-dimensional object to be scanned, the image capturing points on the respective structured light patterns have been deformed, and then between the respective image capturing points and the projected points The corresponding relationship makes it easy to find key data for analysis and decoding. At the decoded points, the trigonometric function method can be used to solve the three-dimensional information of the object. This technology can be applied to target distance detection, scanning of irregular items (eg, inspection of manufactured parts or artwork), reverse engineering, gesture recognition, and the creation of 3D maps.

A structured optical coding system is based on projecting a single pattern or a set of patterns onto a measurement scene, followed by a single camera or multiple cameras; the patterns are specifically designed to allow the coding code to be assigned Up to a set of pixels; and each coded pixel has its own coding code, so the coordinates from the coding code are directly mapped to the coordinates of the corresponding pattern, according to their coding strategy: roughly distinguishable: time coding, spatial coding, Direct coding; the most commonly used strategy is time-based coding. The advantage of temporal encoding based systems is that a plurality of different coding patterns are sequentially projected onto the surface of the scene to obtain a corresponding sequence of encoded images, and the encoded image sequences are combined for decoding. It has high accuracy, High resolution and other advantages.

In the case of time coding, a set of patterns needs to be projected onto the measurement surface in chronological order; the most typical light projection device used in the past is the use of a slide projector, but the slide projector requires a mechanism to switch slides, thus causing a bulky and cumbersome disadvantage. At the same time, the use and operation are more complicated and difficult; recently, the commonly used light-emitting devices are micro-LCD and DMD video projectors, such as US Patent US6263234 and US6977732, but although it improves the bulkiness, the projector equipment is not only expensive. Only a few patterns can be projected, which is particularly wasteful when the usage rate is not high; therefore, the industry and consumers are demanding a kind of investment that can provide low price, high precision and fast, and does not require additional moving parts. Optical device.

The main purpose of this creation is to provide parallel light with one or more (laser or LED) illumination sources, with a collimating mirror, and then provide one or more structured light patterns by the transmissive graphic modulation device, and then enter After the dichroic mirror adjusts the light, it is projected by the projection lens to achieve a projection device of a three-dimensional contour scanner with reduced accumulation, portability and low cost.

In order to achieve the above objectives, the case can be achieved in the following ways: A light source group is provided, which comprises three different wavelengths of light source; three sets of collimating mirrors are respectively placed in front of the light source in front of the light source, so that the light source is emitted from the light source and is formed by the collimator mirror. Parallel light is emitted; a dichroic mirror is provided, which has three light-incident sides and one light-emitting side respectively; three sets of transmissive pattern modulation devices are respectively disposed on the three light-incident sides of the dichroic mirror And a projection lens, which is placed on the dichroic mirror and a light exiting side, can provide different structured light projections by the difference in the opening time of the illumination source.

Another embodiment of the present invention includes: a light source capable of providing a light source to project forward; and a collimating mirror disposed at a light source passing in front of the light source to cause the light source to be emitted from the light source and then passed through the collimating mirror After the formation of parallel light emission; a transmissive graphic modulation device is placed on the other side of the collimating mirror; a projection lens is placed outside a transmissive graphic modulation device; thus, the light can be re-simplified by A light source, a collimating mirror, a transmissive pattern modulation device, and a projection lens are combined to form a three-dimensional contour scanner projection device of a single structure light pattern.

10‧‧‧Light source group

11‧‧‧Light source

12‧‧‧Light source

13‧‧‧Light source

14‧‧‧Light source

20‧‧‧ collimation mirror

21‧‧‧ Collimation mirror

22‧‧‧ Collimation mirror

23‧‧‧ Collimation mirror

30‧‧‧Mirror

31‧‧‧Mirror

40‧‧‧Transmissive graphic modulation device

41‧‧‧Transmissive graphic modulation device

42‧‧‧Transmissive graphic modulation device

43‧‧‧Transmissive graphic modulation device

50‧‧‧ dichroic mirror

51‧‧‧light side

52‧‧‧light side

53‧‧‧light side

54‧‧‧Lighting side

60‧‧‧Projection lens

61‧‧‧Projection lens

70‧‧‧ structured light pattern

L1‧‧‧ light source

L2‧‧‧ light source

L3‧‧‧ light source

L4‧‧‧ light source

Figure 1 is a schematic diagram of the first embodiment of the present creation.

Figure 2 is a schematic diagram of a second embodiment of the present creation.

Figure 3 is a schematic diagram of a third embodiment of the present creation.

Figure 4 is a structural light diagram using a three-dimensional contour scan.

Referring to FIG. 1 , it is a first application embodiment of the present invention, which mainly includes: a light source group 10 including three different wavelengths of illumination sources 11 , 12 , 13 , wherein the illumination sources 11 , 12 , 13 is mainly an embodiment in which LED or laser light is used as a light source, and red, The difference between green and blue as the light source; the three sets of collimating mirrors 20, 21, 22 are respectively placed at the light source L1, L2, L3 in front of the illumination sources 11, 12, 13 so that the light sources L1, L2, L3 are After the light sources 11, 12, 13 are emitted, the collimating mirrors 20, 21, and 22 are all formed into excellent parallel light exits; a dichroic prism 50 (the Dichroic prism) has three light incident sides 51, 52, respectively. And a light-emitting side 54; three sets of transmissive pattern modulation devices 40, 41, 42 are respectively placed on the three light-incident sides 51, 52, 53 of the dichroic mirror 50; a projection lens 60, It is placed on the dichroic mirror 50 and on the light exiting side 54.

The three illumination sources 11, 12, 13 and the collimating mirrors 20, 21, 22 can be arranged side by side in front of one light-incident side 52 of the dichroic mirror 50, and then two mirrors 30, 31 respectively The light sources L1, L3 are guided to the other two light incident sides 51, 53 of the dichroic mirror 50.

Then, when the three light sources 11, 12, 13 respectively emit the light sources L1, L2, L3 of different wavelength bands, respectively, the collimating mirrors 20, 21, 22 for collimating the light are respectively introduced, and then directly or indirectly respectively. At the three light incident sides 51, 52, 53 of the color mirror 50, respectively, through the transmissive pattern modulation devices 40, 41, 42 respectively, a structured light pattern is projected, and each specific pattern is subdivided. After the color mirror 50, the light exiting side 54 of the dichroic mirror 50 is emitted, and enters the projection lens 60 to project the structured light pattern.

However, in actual use, the structured light pattern can be further matched, such as the three illumination sources 11, 12, 13 shown in Figures 1 and 2, which can be time-programmed by the light source being turned on. Different pattern projections are achieved, for example, one illumination source 11, 12, 13 is respectively projected, and there are three patterns, and then two or two are opened, and three patterns are also provided, and at the same time, three illumination sources 11, 12, 13 are simultaneously turned on. A total of up to seven patterns can be changed, which is achieved by the fact that the opening times of the three illumination sources 11, 12, 13 are not simultaneous or simultaneous.

Referring to FIG. 2, which is a second application embodiment of the present invention, different from the first embodiment of the first embodiment, three illumination sources 11, 12, 13 and opposite collimating mirrors. 20, 21, 22 are directly placed in front of the three light incident sides 51, 52, 53 of the dichroic mirror 50, so that the light sources L1, L2, L3 are emitted from the light sources 11, 12, 13 and then collimated by the collimating mirrors 20, 21 After 22, excellent parallel light emission is formed, that is, directly entering the middle of the dichroic mirror 50 does not require other reflection.

The first and second application embodiments described above mainly use the three different band lights of the present invention, combined with the three structured light modes, to obtain an excellent scanning effect, but can still be simplified by using the creative features of the present case. For the structure, please refer to FIG. 3, which is mainly provided with: a strong light source 14 which is mainly an LED as a light source, which can provide a suitable light source L4 to project forward; a collimation The mirror 23 is disposed at a position of the light source L4 in front of the light source 14 so that the light source L4 is emitted from the light source 14 and then passed through the collimator lens 23 to form excellent parallel light; a transmissive pattern modulation device 43 is coupled. On the other side of the collimating mirror 23; a projection lens 61 is disposed outside a transmissive pattern modulation device 43 to make the illumination source 14, the collimating mirror 23, the transmissive pattern modulation device 43, and the projection lens 61 Assembled to achieve a streamlined 3D contour scanner projection device.

Therefore, when using this case, it will have the following advantages:

1. The entire volume of the projection device of the present case is more compact and smaller than that of the conventional one, which greatly improves the disadvantages of the bulky and bulky use, and the operation is simpler.

2. Since the projection device of this case is only a small number of parts, it has excellent carrying convenience, especially integrated with mobile phones or other electronic products, and has a wide range of uses.

3. Since the design parts of this case are products that are currently available, they are designed and matched in a clever manner, so the existing materials can be used in cost, and the production cost is lower, and the use is more practical. Cost-effective creation.

However, the structure described above is only a preferred embodiment of the present invention, and is not To limit the scope of the implementation of this work; therefore, if you are familiar with the equivalent or easy changes of this skill, you can make equal changes and modifications without departing from the spirit and scope of this creation, for example, integrating the case on mobile phones or electronics. Inside the part, or simply attaching the features of the case to the existing product without innovative functional enhancement, or slightly changing the number of light sources or the number of prospective mirrors, should still be covered by the features of this creation.

10‧‧‧Light source group

11‧‧‧Light source

12‧‧‧Light source

13‧‧‧Light source

20‧‧‧ collimation mirror

21‧‧‧ Collimation mirror

22‧‧‧ Collimation mirror

30‧‧‧Mirror

31‧‧‧Mirror

40‧‧‧Transmissive graphic modulation device

41‧‧‧Transmissive graphic modulation device

42‧‧‧Transmissive graphic modulation device

50‧‧‧ dichroic mirror

51‧‧‧light side

52‧‧‧light side

53‧‧‧light side

54‧‧‧Lighting side

60‧‧‧Projection lens

L1‧‧‧ light source

L2‧‧‧ light source

L3‧‧‧ light source

Claims (7)

A projection device for a three-dimensional contour scanner includes at least: a light source group including three different wavelengths of light sources; three sets of collimating mirrors respectively disposed at a light source passing in front of the light source to cause the light source to be emitted from the light source After the collimating mirror, excellent parallel light is formed; a dichroic mirror has three light-in sides and one light-emitting side; three sets of transmissive pattern modulation devices are respectively placed in the dichroic mirror At the three entrance sides of the light; a projection lens is placed on the dichroic mirror and on the light exit side. The projection device of the three-dimensional contour scanner according to claim 1, wherein the three illumination sources and the collimation mirrors in the light source group are arranged side by side and disposed in front of a light incident side of the dichroic mirror. The projection device of the three-dimensional contour scanner according to claim 1, wherein the light source of the at least one illumination source in the light source group is incident on the light incident side of the transmissive pattern modulation device by a mirror. The projection device of the three-dimensional contour scanner according to claim 1, wherein the light sources of the two illumination sources in the light source group are respectively injected by a mirror into the light incident side of the transmissive pattern modulation device. . The projection device of the three-dimensional contour scanner according to claim 1, wherein the opening times of the three illumination sources in the light source group are not simultaneous. The projection device of the three-dimensional contour scanner according to claim 1, wherein the opening times of the three illumination sources in the light source group are simultaneous. A projection device for a three-dimensional contour scanner includes at least: a light source capable of providing a light source to project forward; A collimating mirror is disposed at a light source in front of the light source, so that the light source is emitted from the light source and then collimated to form parallel light; a penetrating pattern modulation device is placed on the other side of the collimating mirror a projection lens is placed on the outside of a transmissive graphic modulation device; and a single structured light pattern is formed by the combination of the above-mentioned illumination source, collimation mirror, transmissive pattern modulation device and projection lens 3D contour scanner projection device.