Grating module

Abstract

The utility model discloses a grating module group, including LD laser devices, collimating lens group, light combination prism, projection lens, image sensor and shell, the LD laser devices are arranged at the right side of the inner cavity of the shell, and the number of the LD laser devices is two. Array light spots are projected by a grating sheet behind the light combination prism, the light combination prism is subjected to film coating processing, when blue light and green light pass through the light combination prism in a designed light path, a part of light is reflected to the image sensor through blue light transmission, and no stray light enters the image sensor in the light path by coating a green and blue blocking film system on the light combination prism; therefore, projection linear array light spots do not have obvious strong zero-order light spots, the uniformity is improved, meanwhile, an image sensor in the grating module is prevented from being interfered by stray light in a light path, and the modeling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a grating module. Background Art

[0002] Grating modules are used in medical oral scanning modeling equipment, object 3D modeling, etc. The scanning gun is required to be easy to hold. The handheld scanning gun contains the optical components of the grating module. The optical performance directly affects the accuracy of modeling and the scanning effect. In orthodontics, your oral data was previously obtained by taking a mold, and a model was made by biting silicone rubber. The optical oral scanning process simplifies the data procurement process of taking a mold. The light source used in the current market solution is an LED light source that projects a linear array of light spots onto the oral cavity for modeling through a filter and a grating sheet.

[0003] When the existing light source is used, the projected linear array light spot has an obvious strong zero-order light spot with low uniformity, and the image sensor in the grating module will be interfered by the stray light in the optical path, affecting the modeling effect. Therefore, we propose a grating module to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is achieved by the following technical solution:

[0005] A grating module comprises an LD laser, a collimating lens group, a light-combining prism, a projection lens, an image sensor and a shell, wherein the LD laser is arranged on the right side of an inner cavity of the shell, and two LD lasers are arranged, the collimating lens group is arranged on the left side of the LD laser, and the light-combining prism is arranged on the left side of the collimating lens group, the projection lens is arranged on the left side of the light-combining prism, the image sensor is arranged at the bottom of the light-combining prism, and a dustproof mechanism is arranged on the left side of the shell.

[0006] Furthermore, the LD laser is set as a blue-green light source, and the blue light and green light of the LD laser are 100mw at a wavelength of 450nm and 30mw at a wavelength of 520nm respectively.

[0007] Furthermore, the size of the collimating lens in the collimating lens group is greater than or equal to 8*8 mm.

[0008] Furthermore, the size of the light-combining prism is 10*10*10mm.

[0009] Furthermore, the diagonal angle of the projection lens is DFO60°.

[0010] The cam is secured to the outer wall of the housing and is provided with a plurality of camshafts, each of which is secured to the outer wall of the housing and is capable of being detached from the housing and removably secured to the exterior of the housing.

[0011] Furthermore, two support plates distributed on the left and right are fixedly connected to the bottom of the shell, and a soft cushion is fixedly connected to the bottom of the support plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. By designing two blue-green LD lasers, and using a grating sheet to project an array light spot after the light-combining prism, the light-combining prism is coated. When the blue-green light passes through the light-combining prism in the designed light path, part of the blue light transmission will be reflected on the image sensor. By coating the light-combining prism with a transparent green-blocking blue film system, no stray light in the light path enters the image sensor, so that the projected linear array light spot has no obvious strong zero-order light spot, and the uniformity is improved. At the same time, the image sensor in the grating module is prevented from being disturbed by the stray light in the light path, which is conducive to improving the modeling effect;

[0014] 2. Through the arrangement of the outer shell, end cover, connecting plate, fixing column, cylindrical cavity, square groove, block, rotating rod, reset spring and limit ring, the outer shell can be sealed by the end cover when the grating module is not in use, so as to protect the projection lens from dust. When it needs to be opened for use, the end cover is pulled to slide horizontally to the left, and the block is driven to detach from the inner cavity of the square groove. Then, the end cover is rotated upward with the rotating rod as the center of the circle, so that the outer shell can be quickly opened, thereby improving the convenience of user operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the explosion structure of this embodiment;

[0016] Figure 2 Schematic diagram of the front structure of the shell of this embodiment.

[0017] In the figure: 1. LD laser; 2. Collimating lens group; 3. Light-combining prism; 4. Projection lens; 5. Image sensor; 6. Housing; 7. Support plate; 8. Cushion; 9. End cover; 10. Connecting plate; 11. Fixed column; 12. Cylindrical cavity; 13. Square groove; 14. Square; 15. Rotating rod; 16. Return spring; 17. Limiting ring. DETAILED DESCRIPTION

[0018] The utility model provides the following technical solutions:

[0019] Example 1, please refer to Figure 1 and Figure 2 :

[0020] A grating module comprises an LD laser 1, a collimating lens group 2, a light-combining prism 3, a projection lens 4, an image sensor 5 and a housing 6, wherein the LD laser 1 is arranged on the right side of an inner cavity of the housing 6, and two LD lasers 1 are arranged, the collimating lens group 2 is arranged on the left side of the LD laser 1, and the light-combining prism 3 is arranged on the left side of the collimating lens group 2, the projection lens 4 is arranged on the left side of the light-combining prism 3, the image sensor 5 is arranged at the bottom of the light-combining prism 3, the LD laser 1 is arranged as a blue-green light source, the blue light and the green light of the LD laser 1 are 100mw at a wavelength of 450nm and 30mw at a wavelength of 520nm respectively, the size of the collimating lens in the collimating lens group 2 is greater than or equal to 8*8mm, the size of the light-combining prism 3 is 10*10*10mm, the diagonal angle of the projection lens 4 is DFO60°, the bottom of the housing 6 is fixedly connected to two left-right distributed support plates 7, and the bottom of the support plate 7 is fixedly connected to a soft pad 8 to improve stability.

[0021] Working principle: When the utility model is in use, the manufacturing parameters of the grating and the light-combining prism 3 are fed back to the internal process manufacturing, and the LD laser 1, the collimating lens group 2 and the projection lens 4 are fed back to the supply chain for component procurement, and the packaging structure size and materials are confirmed. After the product processing is completed, the delivery plan is carried out for performance testing, and the actual transmittance value under the blue and green wavelengths is detected by a power meter / the detection value under the blue and green light sources is the efficiency value under the actual wavelength, and the theoretical design efficiency value is compared to confirm the product compliance. In the test, two blue-green L D laser 1, and a grating sheet is used to project an array light spot behind the light-combining prism 3, and the light-combining prism 3 is coated. When the blue-green light passes through the light-combining prism 3 in the designed light path, a part of the blue light transmission will be reflected on the image sensor 5. By coating the light-combining prism 3 with a transparent green-blocking blue film system, no stray light in the light path enters the image sensor 5, so that the projected linear array light spot has no obvious strong zero-order light spot, and the uniformity is improved. At the same time, the image sensor 5 in the grating module is prevented from being disturbed by the stray light in the light path, which is beneficial to improving the modeling effect.

[0022] Example 2, please refer to Figure 2:

[0023] A dustproof mechanism is provided on the left side of the housing 6, and the dustproof mechanism includes an end cover 9, and the end cover 9 is sleeved on the left side of the housing 6, a connecting plate 10 is fixedly connected to the top of the end cover 9, and a fixing column 11 is provided on the right side of the connecting plate 10, and the fixing column 11 is fixedly connected to the outer wall of the housing 6, and a cylindrical cavity 12 is opened on the fixing column 11 near the left side, and a square groove 13 is opened at the center of the right side of the inner cavity of the cylindrical cavity 12, and a square block 14 adapted thereto is slidably fitted in the inner cavity of the square groove 13, and the left side of the square block 14 A rotating rod 15 is fixedly connected, and a through hole connected to the inner cavity of the cylindrical cavity 12 is opened at the left center of the fixed column 11, and the left end of the rotating rod 15 passes through the inner cavity of the through hole and is fixedly connected to the connecting plate 10. The outer wall of the rotating rod 15 is sleeved with a reset spring 16 and a limit ring 17, and the outer wall of the limit ring 17 is fitted with the inner wall of the cylindrical cavity 12, and the limit ring 17 is fixedly connected to the rotating rod 15, and the left and right ends of the reset spring 16 are respectively fitted with the inner wall of the cylindrical cavity 12 and the limit ring 17.

[0024] Working principle: When the utility model is in use, the stability of the grating module during operation can be improved by setting the left-right symmetrical support plate 7 and the soft pad 8, and the end cover 9 is used to seal the outer shell 6 when the grating module is not in use, so as to protect the projection lens 4 from dust. When it needs to be opened for use, the end cover 9 is pulled to slide horizontally to the left, and the end cover 9 moves to the left to drive the connecting plate 10 to move to the left. The connecting plate 10 moves to the left and can drive the block 14 to detach from the inner cavity of the square groove 13 through the rotating rod 15. Then, the end cover 9 is rotated upward with the rotating rod 15 as the center of the circle. After the end cover 9 is rotated one hundred and eighty degrees, the end cover 9 can be loosened, so that the block 14 can be reset into the inner cavity of the square groove 13 under the action of the rebound force of the reset spring 16, thereby maintaining the stability of the end cover 9, and then the outer shell 6 can be quickly opened, thereby improving the convenience of user operation.

Claims

1. A grating module, comprising an LD laser (1), a collimating lens group (2), a light combining prism (3), a projection lens (4), an image sensor (5) and a housing (6), characterized in that: The LD laser (1) is arranged on the right side of the inner cavity of the housing (6), and two LD lasers (1) are arranged, the collimating lens group (2) is arranged on the left side of the LD laser (1), and the light-combining prism (3) is arranged on the left side of the collimating lens group (2), the projection lens (4) is arranged on the left side of the light-combining prism (3), the image sensor (5) is arranged at the bottom of the light-combining prism (3), and a dust-proof mechanism is arranged on the left side of the housing (6).

2. A grating module according to claim 1, characterized in that: The LD laser (1) is a blue-green light source, and the blue light and green light of the LD laser (1) have a wavelength of 450 nm and a power of 100 mW, respectively, and a wavelength of 520 nm and a power of 30 mW.

3. A grating module according to claim 1, characterized in that: The size of the collimating lens in the collimating lens group (2) is greater than or equal to 8*8 mm.

4. A grating module as claimed in claim 1, characterized in that: The size of the light combining prism (3) is 10*10*10 mm.

5. A grating module as claimed in claim 1, characterized in that: The diagonal angle of the projection lens (4) is DFO60°.

6. A grating module as claimed in claim 1, characterized in that: The dustproof mechanism comprises an end cover (9), and the end cover (9) is sleeved on the left side of the outer shell (6), a connecting plate (10) is fixedly connected to the top of the end cover (9), and a fixing column (11) is provided on the right side of the connecting plate (10), and the fixing column (11) is fixedly connected to the outer wall of the outer shell (6), and a cylindrical cavity (12) is provided on the fixing column (11) near the left side, and a square groove (13) is provided at the center of the right side of the inner cavity of the cylindrical cavity (12), and a square block (14) matching with the inner cavity of the square groove (13) is slidably fitted therein, and the left side of the square block (14) is fixedly connected to the outer wall of the outer shell (6). A rotating rod (15) is connected, a through hole communicating with the inner cavity of the cylindrical cavity (12) is opened at the left center of the fixed column (11), and the left end of the rotating rod (15) passes through the inner cavity of the through hole and is fixedly connected to the connecting plate (10), the outer wall of the rotating rod (15) is sleeved with a reset spring (16) and a limit ring (17), the outer wall of the limit ring (17) is arranged to fit the inner wall of the cylindrical cavity (12), and the limit ring (17) is fixedly connected to the rotating rod (15), and the left and right ends of the reset spring (16) are respectively arranged to fit the inner wall of the cylindrical cavity (12) and the limit ring (17).

7. A grating module according to claim 1, characterized in that: Two support plates (7) distributed on the left and right are fixedly connected to the bottom of the shell (6), and a soft pad (8) is fixedly connected to the bottom of the support plate (7).

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