Infrared laser for electronic whiteboard

Abstract

The utility model belongs to the technical field of semiconductor lasers, and discloses an infrared laser for an electronic whiteboard, which comprises a shell, an infrared laser diode, a focusing lens, an optical lens module and a driving circuit. A focusing lens and an optical lens module are sequentially installed at the front end of the infrared laser diode, an optical lens of the optical lens module is a linear wave lens, the included angle between the lens surface of the linear wave lens and an infrared laser spot can be adjusted through a lens sleeve of the optical lens module, and lasers with different optical film thicknesses and laser field angles are formed. The method is suitable for electronic whiteboards in various scenes. The front end of the shell is cylindrical, and the rear end is square, thereby facilitating installation and debugging. The infrared lasers are symmetrically installed in the middle of an electronic whiteboard frame, a sector formed by the two lasers completely covers the whiteboard, and the red laser is additionally arranged in the middle to serve as an indicating light source. The electronic whiteboard is suitable for being used in various scenes, and has the advantages of being easy and convenient to install and high in recognition precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to a semiconductor laser technical field especially relates to a kind of infrared laser for electronic whiteboard. BACKGROUND

[0002] Semiconductor laser is also called semiconductor laser diode, or simply laser diode, due to the specificity of the material structure of semiconductor material and the particularity of the electron motion law in semiconductor material, the working characteristics of semiconductor laser have its particularity;Semiconductor laser is mainly applied to laser communication, information storage, processing and display, laser ranging, guidance, night vision and laser spectroscopy research and other fields.

[0003] In electronic whiteboard equipment, infrared laser is usually used as laser emission module to form laser network or light spot for detecting user's operation on electronic whiteboard, but due to the limited coverage of single laser, it cannot meet the demand of large-size electronic whiteboard, in order to ensure that laser grid covers the surface of the entire electronic whiteboard, laser is usually installed in the corner of electronic whiteboard, such as installing one in each of the four corners, which can cover the entire whiteboard surface, or providing optical lens or diffuser for laser to diffuse laser beam into fan shape or grid shape, but the existing laser adopts a linear mirror as a laser refracting mirror, and the linear mirror is usually set at an angle of 90° with the laser strip-shaped light spot, although the formed light film is thick, which is convenient for infrared camera to capture, but the light is scattered, and the touch point formed by reflection is large during use, which is not conducive to camera recognition when the picture size is small or the touch points are dense, and it is easy to appear false touch. Therefore, it is necessary to provide an infrared laser capable of solving the problems of the prior art. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of infrared laser for electronic whiteboard, solve the shortcoming that prior art needs to install laser in the corner of electronic whiteboard and light film thickness is thick, not applicable to the scene of small picture size.

[0005] The utility model provides the following technical scheme: a kind of infrared laser for electronic whiteboard, comprising: shell, infrared laser diode, focusing lens, optical lens module and drive circuit;

[0006] The front end of the shell is cylindrical, and the rear end is cuboid, the infrared laser diode is assembled in the cuboid, the front end of the infrared laser diode is focusing lens, the focusing lens is assembled in the cylinder, and the front end of the focusing lens is optical lens module;The optical lens module comprises: optical lens and mirror sleeve, the optical lens is assembled in the mirror sleeve, and the mirror sleeve is assembled at the front end of the cylinder;The rear end of the infrared laser diode is connected with drive circuit board through circuit.

[0007] Further, the front end of the infrared laser diode lens is provided with a diaphragm, the center of the diaphragm is collinear with the center of the focusing lens, and the diaphragm can limit the emitted infrared laser spot into a strip-shaped spot.

[0008] Further, the outer wall of the front end of the cylinder is provided with an annular anti-rotation groove and a plane limiting groove, the inner wall of the sleeve is provided with an anti-rotation ring, and the bottom of the sleeve is provided with a limiting protrusion.

[0009] Further, the outer wall of the cylinder is also provided with zero scale marks, the outer wall of the sleeve is provided with angle marks, the optical lens is a one-line wavy mirror, and the included angle formed by the one-line of the one-line wavy mirror and the infrared laser spot can be adjusted by rotating the sleeve.

[0010] Further, the infrared wavelength of the infrared laser diode is preferably 808nm or 940nm.

[0011] Further, the focusing lens and the one-line wavy mirror are fixed in the shell by bonding or clamping.

[0012] Further, the infrared laser is installed in the middle part of the frame of the electronic whiteboard, the number of the infrared lasers is 2, the first infrared laser and the second infrared laser are symmetrically installed on the center line of the electronic whiteboard, the laser fan formed by the first infrared laser and the second infrared laser is adjusted by rotating the sleeve to realize complete coverage of the electronic whiteboard, and a red laser is installed between the first infrared laser and the second infrared laser.

[0013] The utility model has the following beneficial effects due to the above technical scheme:

[0014] The utility model discloses a one-line wavy mirror mirror surface one-line and infrared laser spot form the included angle optimization as variable included angle through the sleeve rotation, compared with the prior art that one-line line mirror mirror surface one-line and strip-shaped infrared laser spot are arranged into 90 ° included angle, can realize the dynamic adjustment of laser opening angle and film thickness, adapts to different resolution and touch precision demand, also can satisfy different camera identification.

[0015] The utility model discloses a front end cylindrical, rear square structure's shell is set up, can ensure that laser fan face is parallel with reference end face when installing laser, and the late installation debugging is convenient, through the symmetrical installation of 2 infrared lasers in the frame middle part of electronic whiteboard, the laser fan face formed by two infrared lasers can completely cover electronic whiteboard through the mirror sleeve rotation adjustment, install one red light laser in two 2 infrared lasers, the light path of red light laser is identical with infrared laser, as indicating light source, convenient for user observation operation position's scene. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the utility model and form part of the application and do not constitute improper limitation to the utility model, and in the drawings:

[0017] Figure 1 It is the schematic diagram of the utility model;

[0018] Figure 2 It is the partial structure section view of the utility model;

[0019] Figure 3 It is Figure 2 It is the local enlarged schematic view of mark A in the middle;

[0020] Figure 4 It is the shell partial structure schematic diagram of the utility model;

[0021] Figure 5 It is the optical lens module schematic diagram of the utility model;

[0022] Figure 6 It is the infrared laser irradiation simulation diagram of the utility model;

[0023] Figure 7 It is the layout schematic diagram of the utility model for electronic whiteboard.

[0024] In the drawing: 1 - shell;11 - cuboid;12 - cylinder;121 - annular anti - rotation groove;122 - plane limiting groove;123 - zero scale mark point;2 - infrared laser diode;21 - diaphragm;22 - circuit;3 - focusing lens;4 - optical lens module;41 - optical lens;42 - mirror sleeve;421 - anti - rotation ring;422 - limiting lug;423 - angle mark;5 - drive circuit;61 - infrared laser spot;62 - mirror surface of one - dimensional wave mirror;7 - red light laser;8 - electronic whiteboard;A1 - first infrared laser;A2 - second infrared laser. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below in combination with the drawings and specific embodiments, here the schematic embodiment and the utility model are used to explain the utility model, but not as the limitation of the utility model.

[0026] Embodiment one:

[0027] Please refer to Figure 1 and Figure 2 An infrared laser for electronic whiteboard, comprising: a shell 1, an infrared laser diode 2, a focusing lens 3, an optical lens module 4 and a driving circuit 5.

[0028] The rear end of the shell 1 is a cuboid 11, and the front end is a cylinder 12, the rear end in the shape of the cuboid 11 can ensure that the laser fan is parallel to the reference end face when installing the laser, which facilitates the installation and debugging in the later period, the infrared laser diode 2 is assembled in the cuboid 11, the front end of the infrared laser diode 2 is the focusing lens 3, the focusing lens 3 is assembled in the cylinder 12, and the front end of the focusing lens 3 is the optical lens module 4; the optical lens module 4 comprises: an optical lens 41 and a mirror sleeve 42, the optical lens 41 is assembled in the mirror sleeve 42, and the bottom of the mirror sleeve 42 is assembled at the front end of the cylinder 12; the rear end of the infrared laser diode 2 is connected with a circuit 22, and the driving circuit board 5 is connected through the circuit 22.

[0029] In the further description of the embodiment, the diaphragm 21 is installed at the front end of the lens of the infrared laser diode 2, the center of the diaphragm 21 is collinear with the center of the focusing lens 3, and the diaphragm 21 limits the infrared laser spot 61 emitted by the infrared laser diode 2 to be a strip-shaped spot.

[0030] Please refer to Figure 3-5 In the further description of the embodiment, the outer wall of the cylinder 12 at the front end of the shell 1 is provided with an annular anti-rotation groove 121 and a plane limiting groove 122, the inner wall of the mirror sleeve 42 is provided with an anti-rotation ring 421, and the bottom of the mirror sleeve 42 is provided with a limiting protrusion 422, when the mirror sleeve 42 is assembled on the cylinder 12, the annular anti-rotation groove 121 and the anti-rotation ring 421 are engaged, and the plane limiting groove 122 and the limiting protrusion 422 are engaged.

[0031] In the further description of the embodiment, the outer wall of the cylinder 12 is also provided with zero scale points 123, the outer wall of the mirror sleeve 42 is provided with angle marks 423, the optical lens 41 is a one-character wavy mirror, the included angle formed by the one-character wavy mirror surface 62 and the infrared laser spot 61 can be adjusted by rotating the mirror sleeve 42, the annular anti-rotation groove 121 and the anti-rotation ring 421 are engaged, and the plane limiting groove 122 and the limiting protrusion 422 are engaged to lock the adjusted angle.

[0032] In further description of the embodiment, the focusing lens 3 and the optical lens 41 are assembled by gluing or clamping.

[0033] Embodiment two:

[0034] Please refer to Figure 7 , the infrared laser is installed in the middle of the frame of the electronic whiteboard 8, the number of infrared lasers is 2, the first infrared laser A1 and the second infrared laser A2 are symmetrically installed in the middle of the frame of the electronic whiteboard 8 with the middle line of the electronic whiteboard 8 as the boundary, the laser fan formed by the first infrared laser A1 and the second infrared laser A2 is adjusted by rotating the mirror sleeve 42 to realize complete coverage of the electronic whiteboard, a red laser 7 is installed between the first infrared laser A1 and the second infrared laser A2, the optical path of the red laser 7 is consistent with that of the infrared laser, which serves as an indicating light source, the infrared wavelength of the infrared laser diode 2 of the infrared laser is preferably 808nm and 940nm.

[0035] Embodiment three:

[0036] Please refer to Figure 6 , through experimental measurement, when the infrared wavelength of the infrared laser diode 2 is preferably 808nm, the diameter of the one-waved mirror is 5mm, the diameter of the infrared laser spot passing through the diaphragm 21 is 4mm, when the included angle between the infrared laser spot 61 and the one-waved mirror surface one-waved 62 is 0°, the light film thickness at a distance of 1m from the laser is 3mm-4mm, and the laser opening angle is about 40°-50°; when the included angle between the infrared laser spot 61 and the one-waved mirror surface one-waved 62 is 45°, the light film thickness at a distance of 1m from the laser is 6mm-7mm, and the laser opening angle is about 110°-130°; when the included angle between the infrared laser spot 61 and the one-waved mirror surface one-waved 62 is 90°, the light film thickness at a distance of 1m from the laser is 9mm-10mm, and the laser opening angle is about 110°-130°; through data comparison, it is found that when the included angle is 0°, the light film thickness is the smallest, the laser opening angle is the smallest, and it meets the use requirements of high-precision touch recognition scene electronic whiteboard; when the included angle is 45°, the light film thickness is moderate, the opening angle is moderate, and it meets the use requirements of medium-precision, large-range coverage scene electronic whiteboard; when the included angle is 90°, the light film is relatively thick, the opening angle is the largest, the light is relatively divergent, the touch point formed is relatively large, and it meets the use requirements of large-range coverage, low-precision scene electronic whiteboard.

[0037] Table 1 Comparison of experimental data

[0038] Included angle (°) Light film thickness (mm) Laser angle of view (°) Applicable scenarios 0 3～4 40～50 High-precision touch recognition 45 6～7 110～130 Medium-precision, large-range coverage 90 9～10 110～130 Large-range coverage, low-precision requirement

[0039] In the embodiment, the electronic whiteboard 8 uses an infrared laser to emit a fan-shaped infrared laser, which can cover the electronic whiteboard 8, and when a person's finger or other pointer appears in the light film range during use, a light spot is formed, and a light spot can be captured by cooperating with an infrared camera, and the position of the light spot and the movement of the light spot can be used as a position indication and feedback of the screen to operate the system, thereby realizing the technical effect of electronic whiteboard projection interaction.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, it can also be indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In the description of the utility model, the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0042] The terms "first", "second", "third" (if any) in the description of the utility model and claims and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described can be implemented in an order other than those illustrated or described herein.

[0043] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or maintenance tool including a series of steps or units does not have to be limited to the steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or maintenance tools.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that, for those skilled in the art, without departing from the structure of the utility model, a number of modifications and improvements can be made, which should be regarded as the protection scope of the utility model, and these will not affect the effect and practicality of the utility model.

Claims

1. An infrared laser for an electronic whiteboard, characterized by: It comprises a shell (1), an infrared laser diode (2), a focusing lens (3), an optical lens module (4) and a driving circuit (5), and the infrared laser is installed on an electronic whiteboard (8); The rear end of the shell (1) is a cuboid (11), and the front end is a cylinder (12), the infrared laser diode (2) is assembled in the cuboid (11), the front end of the infrared laser diode (2) is the focusing lens (3), the focusing lens (3) is assembled in the cylinder (12), and the front end of the focusing lens (3) is the optical lens module (4). The optical lens module (4) comprises an optical lens (41) and a mirror sleeve (42), the optical lens (41) is assembled in the mirror sleeve (42), and the bottom of the mirror sleeve (42) is assembled at the front end of the cylinder (12); the rear end of the infrared laser diode (2) is connected with a circuit (22), and the driving circuit (5) is connected through the circuit (22).

2. The infrared laser of claim 1, wherein: The front end of the lens of the infrared laser diode (2) is provided with a diaphragm (21), the center of the diaphragm (21) is collinear with the center of the focusing lens (3), and the diaphragm (21) limits the infrared laser spot (61) emitted by the infrared laser diode (2) to be a strip-shaped spot.

3. The infrared laser of claim 1, wherein: The outer wall of the cylinder (12) at the front end of the shell (1) is provided with an annular anti-rotation groove (121) and a plane limiting groove (122), the inner wall of the mirror sleeve (42) is provided with an anti-rotation ring (421), and the bottom of the mirror sleeve (42) is provided with a limiting protrusion (422); when the mirror sleeve (42) is assembled on the cylinder (12), the annular anti-rotation groove (121) and the anti-rotation ring (421) are engaged, and the plane limiting groove (122) and the limiting protrusion (422) are engaged.

4. The infrared laser of claim 3, wherein: The outer wall of the cylinder (12) is further provided with zero scale marks (123), the outer wall of the mirror sleeve (42) is provided with angle marks (423), the optical lens (41) is a one-character wavy mirror, and the included angle formed by the one-character wavy mirror surface (62) and the infrared laser spot (61) can be adjusted by rotating the mirror sleeve (42), the adjusted angle is locked through the engagement of the annular anti-rotation groove (121) and the anti-rotation ring (421) and the engagement of the plane limiting groove (122) and the limiting protrusion (422).

5. The infrared laser of claim 1, wherein: The assembly mode of the focusing lens (3) and the optical lens (41) is gluing or clamping.

6. The infrared laser of claim 1, wherein: The infrared laser is installed in the middle of the frame of the electronic whiteboard (8), the number of the infrared laser is two, the first infrared laser (A1) and the second infrared laser (A2) are symmetrically installed in the middle of the frame of the electronic whiteboard (8) with the center line of the electronic whiteboard (8) as the boundary, the laser fan formed by the first infrared laser (A1) and the second infrared laser (A2) is adjusted by rotating the mirror sleeve (42) to realize complete coverage of the electronic whiteboard, a red laser (7) is installed in the middle of the first infrared laser (A1) and the second infrared laser (A2), the light path of the red laser (7) is consistent with that of the infrared laser, and the red laser (7) serves as an indicating light source.

7. The infrared laser of claim 6, wherein: The infrared wavelength of the infrared laser diode (2) of the infrared laser is selected as 808nm or 940nm.

Images