A secondary return optical path scanner device and calibration method

Abstract

The present invention discloses a secondary return optical path scanner device and calibration method, belonging to the field of scanner technology, the device includes an optical path return module, the optical path return module is arranged between the optical lens and the CMOS, used for controlling the optical path, splitting a single section of the optical path into multiple sections of the optical path; wherein the optical path return module includes a primary return mirror, a secondary return mirror and a return bracket, the primary return mirror and the secondary return mirror are assembled on the return bracket, the primary return mirror and the secondary return mirror are used to return the optical path, and adjust the position and posture of the light incident on the CMOS. The present invention utilizes the optical path return, optimizes the layout, achieves the purpose of miniaturization, can freely adjust the position and posture of the core components, so that the scanner device has greater variability in structure, and improves the space utilization rate of the whole machine.

Description

Technical Field

[0001] The present invention relates to the technical field of scanners, and in particular to a secondary return optical path scanner device and a calibration method. Background Art

[0002] Traditional scanners are designed in a way that the optical path of the lens directly enters the CMOS. The direct-entry scanner is affected by the CMOS posture and the length of the optical path back distance, which makes the instrument too thick and too long, resulting in low space utilization of the scanner and too large volume of the whole machine. In addition, multiple returns increase the position and posture of the light incident on the CMOS, and the accuracy of the return optical path is difficult to guarantee. Summary of the invention

[0003] In order to solve the problem that traditional scanners use a design in which the lens light path directly enters the CMOS, resulting in low space utilization and excessive size of the scanner, the embodiment of the present invention aims to provide a secondary return light path scanner device and a calibration method, which utilizes the light path return and optimizes the layout to achieve miniaturization, thereby solving the problems in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a secondary return optical path scanner device, comprising:

[0006] An optical path return module is provided between the optical lens and the CMOS and is used for controlling the optical path and splitting a single optical path into multiple optical paths;

[0007] Among them, the optical path returning module includes a primary returning mirror, a secondary returning mirror and a returning bracket, the primary returning mirror and the secondary returning mirror are assembled on the returning bracket, and the primary returning mirror and the secondary returning mirror are used to return the optical path and adjust the position and posture of the light incident on the CMOS.

[0008] As a further solution of the present invention, the folding bracket is provided with a mounting spherical surface for assembling the primary folding mirror and the secondary folding mirror, the primary folding mirror and the secondary folding mirror are assembled in the mounting spherical surface of the folding bracket, and damping grease is injected between the mounting spherical surface and the lens spherical surfaces of the primary folding mirror and the secondary folding mirror.

[0009] As a further solution of the present invention, the primary folding mirror and the secondary folding mirror are provided with fine-tuning handles for adjusting any spatial degree of freedom of the mirror body.

[0010] As a further solution of the present invention, when calibrating the secondary reentry optical path scanner device, it also includes a test target, an optical platform and a computer. The secondary reentry optical path scanner device and the calibration target are installed on the optical platform. During calibration, the positions of the calibration target and the secondary reentry device are controlled so that the center of the target coincides with the reference point.

[0011] As a further solution of the present invention, the inspection target is in the form of a checkerboard, and the center point is highlighted.

[0012] As a further solution of the present invention, a glue injection port is also provided on the mounting spherical surface of the folding bracket, and UV glue is injected into the glue injection port. After the center of the target coincides with the reference point, a UV lamp is used to completely cure the UV glue to fix the primary folding mirror and the secondary folding mirror.

[0013] As a further solution of the present invention, the secondary return optical path scanner device also includes a mechanical housing, which includes an upper and lower housing. A sealing groove and a stop structure are provided on the assembly surfaces of the upper and lower housings, and a sealing ring is built into the sealing groove.

[0014] As a further solution of the present invention, the inner cavity surface of the mechanical housing is treated with a matte black surface to reduce the refraction of light inside the device.

[0015] In a second aspect, the present invention provides a calibration method for a secondary return optical path scanner device, comprising the following steps:

[0016] Step 1: Assemble the folding mirror in the mounting spherical surface of the folding bracket, and inject damping grease between the mounting spherical surface and the lens spherical surface of the folding mirror. Use the fine-tuning handle of the folding mirror to adjust any degree of freedom of the mirror body in space. The damping oil makes the folding mirror stable at any position in the mounting spherical surface space.

[0017] Step 2: With the aid of the inspection target, the secondary return device and the calibration target are mounted on the optical platform, and the positions of the calibration target and the secondary return device are controlled so that the center of the bull's eye coincides with the reference point;

[0018] Step 3: Start the secondary return optical path scanner device, upload the image to the working computer, and fine-tune the return mirror in real time so that the center of the calibration target is at the center of the computer imaging, and keep the lens of the return mirror stationary at the calibration position;

[0019] Step 4: Inject high-performance UV glue into the glue injection port. After the center imaging of the inspection target is completely centered, use a UV lamp to completely cure the UV glue. The lens is calibrated and fixed.

[0020] As a further solution of the present invention, after the UV glue is completely cured using a UV lamp, it also includes: wiping and cleaning the overflowed damping oil, and applying UV glue around the lens mouth of the folding mirror for curing to complete the sealing of the internal damping oil, and the calibration is now completed.

[0021] In summary, compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0022] The secondary return optical path scanner device of the present invention has a compact structure, utilizes the return of the optical path, optimizes the layout, and achieves the purpose of miniaturization. Similar optical path return applications exist in other fields such as medical devices. By changing the path of the optical path, the position and posture of the core components can be freely adjusted, so that the scanner device has greater structural variability, improves the space utilization of the entire machine, and thus achieves the purpose of miniaturization.

[0023] The secondary return optical path scanner device and calibration method of the present invention have the following advantages:

[0024] (1) The scanner is small in size and saves space. Compared with the direct-entry scanner, which is affected by the CMOS posture and the length of the optical path back distance, the instrument is too thick and too long. The present invention designs a light return form: using the reflection principle of the refractor to design an optical path return module, the spatial posture of the CMOS board is changed (from "vertical" to "flat"), saving space and achieving the purpose of miniaturizing the scanner.

[0025] (2) The optical path accuracy of the secondary reentry scanner is high. Compared with the direct-entry scanner, which makes multiple reentries to increase the position and posture of the light incident on the CMOS, the accuracy of the reentry optical path is difficult to ensure. The present invention designs a precise fine-tuning mechanism to achieve complete control of the six degrees of freedom of the reentry lens in space, and designs a test target for calibrating the position accuracy of the optical path, ensuring the ultra-high position accuracy (micrometer level) of the optical path.

[0026] (3) Stable suspension of the folding mirror during fine-tuning. The folding module of the present invention uses high-performance damping oil to ensure that the folding mirror can be stably suspended at any position. The damping oil has the characteristics of high viscosity and high damping.

[0027] (4) The accuracy of the secondary return scanner is stable. Since the accuracy stability of the scanner is affected by the ambient temperature and structural strength, the presence of the return module increases variables and weakens the stability of the scanner. The present invention uses materials with low thermal expansion coefficients to solve the impact of temperature on the system; the installation between the core parts is all glued except for the use of screws to ensure that no relative displacement occurs.

[0028] (5) Secondary reflection will not cause light attenuation. The present invention uses an ultra-high reflector to achieve the effect of basically no light loss; the shell is designed to be fully sealed to prevent the entry of external light; the inside of the shell is treated with a matte black surface to reduce the reflection of light inside the whole machine.

[0029] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a secondary return optical path scanner device according to an embodiment of the invention.

[0031] Figure 2 It is a schematic structural diagram of a fine-tuning handle in a secondary return optical path scanner device according to an embodiment of the invention.

[0032] Figure 3 It is a schematic structural diagram of a return bracket in a secondary return optical path scanner device according to an embodiment of the invention.

[0033] Figure 4 It is a schematic diagram of the structure of installing a spherical surface in a secondary return optical path scanner device according to an embodiment of the invention.

[0034] Figure 5 It is a schematic structural diagram of a primary return mirror in a secondary return optical path scanner device according to an embodiment of the invention.

[0035] Figure 6 It is a schematic structural diagram of a secondary return mirror in a secondary return optical path scanner device according to an embodiment of the invention.

[0036] Figure 7 The present invention is a schematic structural diagram of a target inspection device in a secondary return optical path scanner device according to an embodiment of the present invention.

[0037] Figure 8 It is a schematic diagram of the structure of a mechanical housing in a secondary return optical path scanner device according to an embodiment of the invention.

[0038] Reference numerals in the figures:

[0039] 1-primary folding mirror, 2-secondary folding mirror, 3-folding bracket, 4-optical lens, 5-CMOS, 6-adjustable laser flange, 7-laser, 8-inspection target, 9-folding optical path, 10-fine-tuning handle, 11-glue injection port, 12-lens spherical surface, 13-mounting spherical surface, 14-reflecting surface, 15-stop structure, 16-sealing ring, 17-upper shell, 18-lower shell. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] See also Figures 1 to 8 As shown, a secondary return optical path scanner device includes an optical path return module. The optical path return module is arranged between the optical lens 4 and the CMOS 5, and is used for controlling the optical path and splitting a single optical path into multiple optical paths.

[0043] Among them, the optical path returning module includes a primary returning mirror 1, a secondary returning mirror 2 and a returning bracket 3, the primary returning mirror 1 and the secondary returning mirror 2 are assembled on the returning bracket 3, and the primary returning mirror 1 and the secondary returning mirror 2 are used to return the optical path and adjust the position and posture of the light incident on the CMOS 5.

[0044] See also Figure 1 , Figure 3 and Figure 4 As shown, the folding bracket 3 is provided with a mounting spherical surface 13 for assembling the primary folding mirror 1 and the secondary folding mirror 2. The primary folding mirror 1 and the secondary folding mirror 2 are assembled in the mounting spherical surface 13 of the folding bracket 3, and damping grease is injected between the mounting spherical surface 13 and the lens spherical surfaces 12 of the primary folding mirror 1 and the secondary folding mirror 2.

[0045] In the embodiment of the present application, through precision machining, the contour degree of the mounting spherical surface 13 of the folding bracket 3 is not greater than 0.008mm; the contour degree of the lens spherical surface 12 of the folding mirror is not greater than 0.008mm, and at the same time, the radius of the mounting spherical surface 13 of the bracket is designed to be 0.018mm larger than the lens spherical surface 12 of the folding mirror, so that the radius difference is accurately controlled.

[0046] In the examples of this application, see Figure 2 As shown, the primary folding mirror 1 and the secondary folding mirror 2 are provided with a fine-tuning handle 10 for adjusting any spatial degree of freedom of the mirror body.

[0047] The folding mirror body is assembled in the mounting spherical surface 13 of the folding bracket 3, and high-performance damping grease is injected between the mounting spherical surface 13 of the folding bracket 3 and the lens spherical surface 12. The fine-tuning handle 10 of the folding mirror can be used to precisely adjust any spatial degree of freedom of the mirror body. At the same time, the high-performance damping oil can stably maintain the folding mirror at any position in space.

[0048] In the embodiment of the present application, the parameters of the damping grease selected for the secondary reentry scanning device are as follows: the high-performance damping grease selected is the Eco L series damping oil, which has the characteristics of high viscosity and high damping, and can provide a torque value of 70-75gf.cm (measured at 25°C), a dynamic viscosity of up to 120,000Mpas (measured at 21°C), and a cone penetration of 400 (measured at 25°C, the damping oil liquid surface thickness is 0.1mm), so as to meet the requirements of the secondary reentry scanning device of the present application.

[0049] In an embodiment of the present application, when calibrating the secondary reentry optical path scanner device, it also includes a test target 8, an optical platform and a computer. The secondary reentry optical path scanner device and the calibration target are installed on the optical platform. During calibration, the positions of the calibration target and the secondary reentry device are controlled so that the center of the target coincides with the reference point.

[0050] In the examples of this application, see Figure 7 As shown, the inspection target 8 is in the form of a checkerboard, and the center point is highlighted. The ceramic material is used to ensure a sufficiently high flatness, and the flatness is 0.005 mm.

[0051] In an embodiment of the present application, a glue injection port 11 is further provided on the mounting spherical surface 13 of the folding bracket 3, and UV glue is injected into the glue injection port 11. After the center of the bull's eye coincides with the reference point, a UV lamp is used to completely cure the UV glue to fix the primary folding mirror 1 and the secondary folding mirror 2. The high-performance UV glue can maintain a stable form at a working temperature of -30°C-70°C. After the center imaging of the inspection target is completely centered, a UV lamp is used to completely cure the UV glue to complete the fixation of the lens.

[0052] In the examples of this application, see Figure 8 As shown, the secondary return optical path scanner device also includes a mechanical housing, which includes an upper and lower housing. A sealing groove and a stop structure 15 are provided on the assembly surfaces of the upper and lower housings, and a sealing ring 16 is built into the sealing groove.

[0053] In this application, the reflector parameters and sealing form selected for the secondary return scanning device are as follows:

[0054] See also Figure 5 As shown, the primary reflector 1 uses an ultra-high reflector with a reflectivity of the reflective surface 14 greater than 99.9%; the secondary reflector 2 uses an ultra-high reflector with a reflectivity of the reflective surface 14 greater than 99.9%.

[0055] Among them, the mechanical shell is divided into an upper shell 17 and a lower shell 18. A rectangular sealing groove (width 1.2mm, depth 0.8mm) is designed on the assembly surface, and a built-in sealing ring 16 (wire diameter 1mm); at the same time, a stop structure 15 is designed to prevent the influence of external ambient light.

[0056] In an embodiment of the present application, the inner cavity surface of the mechanical housing is treated with a matte black surface to reduce the refraction of light inside the device.

[0057] In addition, the material requirements and structural positioning form of the secondary return scanning device are as follows:

[0058] The folding support 3, the laser adjustable flange 6 and the mechanical housing designed by the present invention are made of rigid materials with a thermal expansion coefficient less than 24E-6 / K, eliminating the influence of temperature changes on the relative positions of optics and structures.

[0059] Furthermore, the core components are precisely positioned using a one-side two-pin structure, with the pin-hole gap no greater than 0.06 mm; the core parts (folding bracket 3, folding mirror, lens flange of optical lens 4, adjustable laser flange 6 of laser 7, etc.) are all fixed with screws through glue dispensing.

[0060] Compared with conventional scanners, the secondary return optical path scanner device of the present invention has the following advantages:

[0061] 1. The scanner is small in size and saves space. Compared with the direct-entry scanner, which is affected by the CMOS5 posture and the length of the optical path back distance, resulting in the instrument being too thick and too long, the present invention designs a light return form: using the reflection principle of the refractor to the light, the optical path return module is designed to achieve the change of the spatial posture of the CMOS5 board from "vertical" to "flat", saving space and achieving the purpose of miniaturizing the scanner.

[0062] 2. The optical path precision of the secondary reentry scanner is high. Compared with the direct-entry scanner, which reenters multiple times to increase the position and posture of the light incident on the CMOS 5, the precision of the reentry optical path 9 is difficult to ensure. The present invention designs a precise fine-tuning mechanism to achieve full control of the 6 degrees of freedom of the reentry lens in space, and designs a test target 8 for calibrating the position precision of the optical path, ensuring the ultra-high position precision of the optical path at the micron level.

[0063] 3. Stable suspension of the folding mirror during fine-tuning. The folding module of the present invention uses high-performance damping oil to ensure that the folding mirror can be stably suspended at any position. The damping oil has the characteristics of high viscosity and high damping.

[0064] 4. The accuracy of the secondary return scanner is stable. Since the accuracy stability of the scanner is affected by the ambient temperature and structural strength, the existence of the return module increases variables and weakens the stability of the scanner. The present invention uses materials with low thermal expansion coefficients to solve the impact of temperature on the system; the installation between the core parts is all glued except for the use of screws to ensure that no relative displacement occurs.

[0065] 5. Secondary reflection will not cause light attenuation. The present invention uses an ultra-high reflector to achieve a substantially lossless effect on light; the fully sealed structure of the housing is designed to prevent the entry of external light; the interior of the housing is treated with a matte black surface to reduce the reflection of light inside the entire device.

[0066] See also Figures 1 to 8 As shown, the present invention provides a calibration method for a secondary return optical path scanner device, comprising the following steps:

[0067] Step 1: Assemble the folding mirror in the mounting spherical surface 13 of the folding bracket 3, and inject damping grease between the mounting spherical surface 13 and the lens spherical surface 12 of the folding mirror. Use the fine-tuning handle 10 of the folding mirror to adjust any spatial degree of freedom of the mirror body. The damping oil makes the folding mirror stable at any position in the space of the mounting spherical surface 13.

[0068] Step 2: With the aid of the inspection target 8, the secondary return device and the calibration target are mounted on the optical platform, and the positions of the calibration target and the secondary return device are controlled so that the center of the bull's eye coincides with the reference point;

[0069] Step 3: Start the secondary return optical path scanner device, upload the image to the working computer, and fine-tune the return mirror in real time so that the center of the calibration target is at the center of the computer imaging, and keep the lens of the return mirror stationary at the calibration position;

[0070] Step 4: Inject high-performance UV glue into the glue injection port 11. After the central imaging of the inspection target 8 is completely centered, use a UV lamp to completely cure the UV glue. The lens is calibrated and fixed.

[0071] In an embodiment of the present application, after the UV glue is completely cured using a UV lamp, the process also includes: wiping and cleaning the overflowed damping oil, and applying UV glue around the lens mouth of the folding mirror for curing to complete the sealing of the internal damping oil. At this point, the calibration is completed.

[0072] In an embodiment of the present application, the turning mirror includes a primary turning mirror 1 and a secondary turning mirror 2, wherein the angle between the primary turning mirror 1 and the plane XOY is 98°, and the angle between the primary turning mirror 1 and the plane XOZ is 170.8°; the angle between the secondary turning mirror 2 and the plane XOY is 47.1°, and the angle between the secondary turning mirror 2 and the plane XOZ is 104°, and the optical path deviation is not greater than 1um.

[0073] The secondary return optical path scanner device of the present invention has a compact structure and utilizes the return of the optical path to optimize the layout to achieve the purpose of miniaturization. Similar optical path return applications exist in other fields such as medical devices. By changing the path of the optical path, the position and posture of the core components can be freely adjusted, making the scanner device more variable in structure. According to this idea, a reasonable layout can be achieved, and the space utilization rate of the whole machine can be improved, thereby achieving the purpose of miniaturization.

[0074] The technical principle of the present invention is described above in combination with the specific embodiments, which are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. Those skilled in the art can think of other specific implementations of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A secondary return optical path scanner device, characterized in that: include: An optical path return module, which is arranged between the optical lens (4) and the CMOS (5) and is used for controlling the optical path and splitting a single optical path into multiple optical paths; The optical path return module comprises a primary return mirror (1), a secondary return mirror (2) and a return bracket (3), wherein the primary return mirror (1) and the secondary return mirror (2) are mounted on the return bracket (3), and the primary return mirror (1) and the secondary return mirror (2) are used to return the optical path and adjust the position and posture of the light incident on the CMOS (5); The folding bracket (3) is provided with a mounting spherical surface (13) for assembling the primary folding mirror (1) and the secondary folding mirror (2); the primary folding mirror (1) and the secondary folding mirror (2) are assembled in the mounting spherical surface (13) of the folding bracket (3); damping grease is injected between the mounting spherical surface (13) and the lens spherical surfaces (12) of the primary folding mirror (1) and the secondary folding mirror (2); The primary folding mirror (1) and the secondary folding mirror (2) are provided with a fine-tuning handle (10) for adjusting any spatial degree of freedom of the mirror body; Wherein, when the secondary return optical path scanner device is calibrated, the following steps are included: Step 1: assemble the folding mirror in the mounting spherical surface (13) of the folding bracket (3), and inject damping grease between the mounting spherical surface (13) and the lens spherical surface (12) of the folding mirror, and adjust any spatial degree of freedom of the mirror body through the fine adjustment handle (10) of the folding mirror. The damping oil makes the folding mirror stable at any position in the space of the mounting spherical surface (13); Step 2, with the aid of the inspection target (8), the secondary return device and the calibration target are mounted on the optical platform, and the position of the calibration target and the secondary return device is controlled so that the center of the bull's eye coincides with the reference point; Step 3: Start the secondary return optical path scanner device, upload the image to the working computer, and fine-tune the return mirror in real time so that the center of the calibration target is at the center of the computer imaging, and keep the lens of the return mirror stationary at the calibration position; Step 4: Inject high-performance UV glue into the glue injection port (11). After the central imaging of the inspection target (8) is completely centered, use a UV lamp to completely cure the UV glue, and the lens is calibrated and fixed. After the UV glue is completely cured using the UV lamp, it also includes: wiping and cleaning the overflowed damping oil, and applying UV glue around the lens mouth of the return mirror to cure it, completing the sealing of the internal damping oil, and the calibration is now completed.

2. The secondary return optical path scanner device according to claim 1, characterized in that: The inspection target (8) is in the form of a chessboard, and the central point is highlighted.

3. The secondary return optical path scanner device according to claim 1, characterized in that: The secondary return optical path scanner device also includes a mechanical housing, which includes an upper and lower housing. A sealing groove and a stop structure (15) are provided on the assembly surfaces of the upper and lower housings, and a sealing ring (16) is built into the sealing groove.

4. The secondary return optical path scanner device according to claim 3, characterized in that: The inner cavity surface of the mechanical housing is treated with matte black surface.

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