CN111176471A - Multimedia teaching method and device - Google Patents
Multimedia teaching method and device Download PDFInfo
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- CN111176471A CN111176471A CN202010167589.XA CN202010167589A CN111176471A CN 111176471 A CN111176471 A CN 111176471A CN 202010167589 A CN202010167589 A CN 202010167589A CN 111176471 A CN111176471 A CN 111176471A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000033001 locomotion Effects 0.000 claims abstract description 13
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
- G06F3/03546—Pens or stylus using a rotatable ball at the tip as position detecting member
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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- Business, Economics & Management (AREA)
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- Position Input By Displaying (AREA)
Abstract
本发明公开了一种多媒体教学方法及装置，具体涉及多媒体教学技术领域，包括书写笔身，所述书写笔身底部固定设置有轨迹笔头，所述轨迹笔头底部固定开设有定位窗口，所述定位窗口顶部固定设置有透镜组件，所述轨迹笔头内部固定设置有红光二极管和微型摄像头，所述红光二极管和微型摄像头均与透镜组件匹配设置。本发明通过设置轨迹笔头，红光二极管和微型摄像头配合透镜组件利用图像对比处理分析技术采集学生书写动作时轨迹笔头的运动轨迹，后续再利用字形生成模块生成文字图形，可直接在课桌上进行书写练习，且书写数据方便集中处理，方便教师了解每个同学的书写情况，提高文字教学效果。
The invention discloses a multimedia teaching method and device, in particular to the technical field of multimedia teaching. A lens assembly is fixedly arranged on the top of the window, and a red light diode and a miniature camera are fixedly arranged inside the track pen head, and the red light diode and the miniature camera are all matched with the lens assembly. In the present invention, by setting up a track pen, the red light diode and the miniature camera cooperate with the lens assembly to use the image contrast processing and analysis technology to collect the movement track of the track pen during the writing action of the students, and then use the font generation module to generate text graphics, which can be directly performed on the desk. Writing practice, and the writing data is convenient for centralized processing, it is convenient for teachers to understand the writing situation of each student, and the effect of writing teaching is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of multimedia teaching, in particular to a multimedia teaching method and a multimedia teaching device.
Background
With the increasing development of science and technology, computers, networks and the like are gradually accepted by the education field, so that the daily teaching work of schools and teachers is greatly facilitated, in order to adapt to the development of modern teaching, campus networks are established in most of national, provincial and urban major schools and colleges, and the schools comprehensively realize multimedia teaching. Multimedia teaching is popularized to each school and each classroom, and equipment including computers, networks, video display instruments, digital projection or televisions, audio equipment and the like must be moved into the classroom to implement the multimedia teaching.
The Chinese characters are also called Chinese characters, Chinese characters and square characters, and belong to morpheme syllabic characters of ideographic characters. The Chinese characters are characters for writing Chinese, are also used for writing languages such as Japanese, Korean, Vietnamese and the like, are characters widely used in Chinese character culture circles, and are the only characters widely used in the world at present.
The prior art has the following defects: the writing of chinese character adopts finger or touch pen to write at touch screen stroke mostly at multimedia teaching in-process, and a lot of touch screens need be used to this kind of teaching mode, and the teacher need look over student's the condition of writing one by one, and teaching cost is high, and the teaching quality is low.
Disclosure of Invention
Therefore, the embodiment of the invention provides a multimedia teaching method and device, the movement track of a track pen point is acquired by matching a track pen point, a red light diode and a micro camera with a lens component by utilizing an image comparison processing and analysis technology, a character pattern is generated by utilizing a character pattern generation module subsequently, the writing exercise can be directly performed on a desk, the writing data is convenient to be processed in a centralized manner, a teacher can conveniently know the writing condition of each student, the character teaching effect is improved, and the problem caused by the fact that in the prior art, due to the fact that a large number of touch screens are needed, the teacher is inconvenient to know the writing condition of the student, and the teaching quality is influenced is solved.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a multimedia teaching device comprises a writing pen body, wherein a track pen point is fixedly arranged at the bottom of the writing pen body, a positioning window is fixedly arranged at the bottom of the track pen point, a lens assembly is fixedly arranged at the top of the positioning window, a red light diode and a miniature camera are fixedly arranged in the track pen point, and the red light diode and the miniature camera are both matched with the lens assembly;
the writing pen is characterized in that an image track analysis module used for receiving image information and converting the image information into movement direction and distance information is fixedly arranged inside the writing pen body, the output end of the image track analysis module is connected with a computer used for receiving and processing the movement direction and the distance information of tracks, a character selection module used for selecting practice characters, a character shape generation module used for generating character patterns according to the track information, and a character judgment module used for judging whether the character shapes of the character patterns and the writing are correct or not are arranged inside the computer, and the output end of the computer is connected with a display module used for displaying the character images.
Furthermore, the lens subassembly includes a set of prism and a set of circular lens, ruddiness diode output end sets up with the prism is corresponding, miniature camera head input sets up with the circular lens is corresponding, the vertical setting that corresponds of miniature camera head output and location window.
Furthermore, the image track analysis module is connected with the computer through Bluetooth, a battery module is fixedly arranged inside the writing pen body, the image track analysis module is electrically connected with the battery module, and the display module is one of a large-size display and a projector.
Furthermore, an operation key is fixedly arranged in the middle of the surface of the writing pen body, and a power key is fixedly arranged at the top end of the writing pen body.
Furthermore, support bases are fixedly arranged on two sides of the bottom end of the writing pen body, a connecting base is fixedly arranged at the top of the track pen point, and the two support bases are movably connected with the connecting base through rotating shafts.
Furthermore, a smooth pad is fixedly arranged on the bottom end face of the track pen point and is arranged in an annular shape, the smooth pad is matched and sleeved with the positioning window, and the smooth pad is made of a high-molecular polyethylene material.
A multimedia teaching method based on any one of the claims:
the method comprises the following steps: when multimedia character teaching is carried out, a teacher operates a computer and selects new characters, new words or idioms to be trained by using a character selection module;
step two: distributing a writing pen to each student, wherein the students directly write on a desk according to the new words, new words or idiom information provided by a teacher, a track pen point moves on the desk according to the writing action of the students, an infrared diode emits red light which is emitted from a positioning window through a lens component, a miniature camera head is matched with the focusing of the lens component to shoot images, an image track analysis module receives image information, the seen images are continuously shot and analyzed, the position offset direction and distance data of a track are calculated, and the obtained data are transmitted to a computer;
step three: the computer receives the position deviation direction and the distance data of the track, and the font is generated by using the font generation module to obtain the writing result of the student;
step four: the character judging module compares the characters and the patterns written by the students according to the accurate characters and patterns, analyzes whether the writing of the students is correct or not, and then the teacher carries out subsequent teaching according to the obtained judging result.
The embodiment of the invention has the following advantages:
1. according to the invention, the movement track of the track pen point is acquired by arranging the track pen point, the red light diode and the micro camera together with the lens component by utilizing an image contrast processing analysis technology, the character pattern is generated by the character pattern generation module after the character movement is recycled, and the character writing judgment is carried out by the character judgment module after the character movement is recycled, so that compared with the existing writing mode of an electronic touch screen, a large number of touch screens are not needed in a classroom, the writing exercise can be directly carried out on a desk, the writing data is convenient to be processed in a centralized manner, a teacher can conveniently know the writing condition of each student, and the character teaching effect is improved;
2. the track pen point is convenient to swing and freely adjust the pen holding posture of students by arranging the support and the connecting seat to be connected through the rotating shaft, the positioning window at the bottom of the track pen point is ensured to be stably contacted with the surface of a desk, the motion track is accurately received, the track pen point is convenient to slide by arranging the smooth pad, and the use of a writing pen is convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic diagram of a topology provided by the present invention;
FIG. 2 is a schematic view of the overall structure of the writing pen body according to the present invention;
FIG. 3 is a schematic view of the structure of part A of FIG. 2 according to the present invention;
FIG. 4 is a schematic diagram of a system according to the present invention;
FIG. 5 is a schematic side view of a writing pen body according to the present invention;
FIG. 6 is a schematic view of the bottom view of the trace pen tip according to the present invention;
in the figure: the pen comprises a writing pen body 1, a track pen head 2, a positioning window 3, a lens assembly 4, a red light diode 5, a miniature camera 6, an image track analysis module 7, a computer 8, a character selection module 9, a character generation module 10, a character judgment module 11, a display module 12, a battery module 13, an operation key 14, a power key 15, a support 16, a connecting seat 17, a rotating shaft 18 and a smooth pad 19.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings 1-4 of the specification, the multimedia teaching device of the embodiment comprises a writing pen body 1, wherein a track pen point 2 is fixedly arranged at the bottom of the writing pen body 1, a positioning window 3 is fixedly arranged at the bottom of the track pen point 2, a lens assembly 4 is fixedly arranged at the top of the positioning window 3, a red light diode 5 and a micro camera 6 are fixedly arranged in the track pen point 2, and the red light diode 5 and the micro camera 6 are both matched with the lens assembly 4;
the writing pen body 1 is internally and fixedly provided with an image track analysis module 7 for receiving image information and converting the image information into movement direction and distance information, the output end of the image track analysis module 7 is connected with a computer 8 for receiving and processing the movement direction and the distance information of the track, the computer 8 is internally provided with a character selection module 9 for selecting practice characters, a character shape generation module 10 for generating character patterns according to the track information and a character judgment module 11 for judging whether the character shapes of the character patterns and the writing are correct or not, and the output end of the computer 8 is connected with a display module 12 for displaying the character images.
Further, lens subassembly 4 includes a set of prism and a set of circular lens, 5 outputs of ruddiness diode set up with the prism is corresponding, 6 inputs of miniature camera head set up with the circular lens is corresponding, 6 outputs of miniature camera head set up with the vertical correspondence of positioning window 3, and the light that 5 ruddiness diodes sent passes through the refraction of prism, jets out from positioning window 3, and the mirror image in the positioning window 3 utilizes circular lens's focus, and miniature camera head 6 carries out image pickup, obtains image information.
Further, image track analysis module 7 passes through the bluetooth with the computer 8 and is connected, it is provided with battery module 13 to write the inside fixed of body 1, image track analysis module 7 and battery module 13 electric connection, display module 12 sets up to one of jumbo size display, projecting apparatus, makes things convenient for the track information transmission that image track analysis module 7 obtained to computer 8, and battery module 13 conveniently provides the electric energy support for writing the pen, makes things convenient for student's use.
Further, the middle part of the surface of the writing pen body 1 is fixedly provided with an operation key 14, the top end of the writing pen body 1 is fixedly provided with a power key 15, when the pen is held, the thumb operates the operation key 14 on the writing pen body 1, the writing pen is conveniently controlled to be used, and characters are written.
The implementation scenario is specifically as follows: when the invention is used for multimedia character teaching, a teacher operates a computer 8, selects new words, new words or idioms to be trained by using a character selection module 9, distributes a writing pen to each student, the student directly writes on a desk according to the new words, new words or idioms information provided by the teacher, a track pen point 2 moves on the desk according to the writing action of the student, an infrared diode 5 emits red light which is emitted from a positioning window 3 through a lens assembly 4, a micro camera 6 is matched with the focusing of the lens assembly to shoot images, an image track analysis module 7 receives image information, continuously shoots and analyzes the seen images, calculates the position deviation direction and distance data of the track, the micro camera 6 shoots different images, and the bottom of the track pen point 2 of the black paint is required to shoot images, the illumination is carried out by the red light diode 5, the image trajectory analysis module 7 includes an optical engine inside, which functions as if it were the human eye, constantly capturing the images seen and analyzing them. The optical engine is composed of a CMOS image sensor and an optical positioning DSP (digital signal processor), wherein the CMOS image sensor is responsible for collecting images and synchronizing the images into a binary digital image matrix, the DSP is responsible for analyzing and comparing adjacent image matrices, calculating position offset according to the image matrices, transmitting the obtained data to the computer 8, the computer 8 receives the position offset direction and distance data of a track, the character pattern generating module 10 is used for generating character patterns to obtain the writing result of students, the computer 8 receives the position offset direction and distance data of the track, the character pattern generating module 10 is used for generating character patterns to obtain the writing result of students, the character judging module 11 is used for comparing the accurate character patterns with the character patterns written by the students to analyze whether the students write correctly, and the teacher then performs subsequent teaching according to the obtained judging result.
According to the specification, the attached drawings 5 and 6 show, the multimedia teaching device of the embodiment is characterized in that the supports 16 are fixedly arranged on two sides of the bottom end of the writing pen body 1, the connecting seat 17 is fixedly arranged at the top of the track pen point 2, the supports 16 and the connecting seat 17 are movably connected through the rotating shaft 18, the track pen point 2 is convenient to rotate, the writing pen is convenient to adapt to the pen holding habits of different students, the stable contact between the bottom of the track pen point 2 and the surface of a desk is guaranteed, and the accurate track is convenient to collect.
Furthermore, a smooth pad 19 is fixedly arranged on the bottom end face of the track pen point 2, the smooth pad 19 is arranged in an annular shape, the smooth pad 19 is matched and sleeved with the positioning window 3, the smooth pad 19 is made of a high-molecular polyethylene material, the track pen point 2 can slide conveniently, and the service life of the writing pen is prolonged.
The implementation scenario is specifically as follows: according to the invention, the support 16 and the connecting seat 17 are connected through the rotating shaft 18, so that the track pen point 2 can swing conveniently, students can freely adjust the pen holding posture conveniently, the positioning window 3 at the bottom of the track pen point 2 is ensured to be stably contacted with the surface of a desk, the movement track is accurately received, the smooth pad 19 facilitates the sliding of the track pen point 2, and the use of a writing pen is facilitated.
A multimedia teaching method according to any of claims 1-6, comprising:
the method comprises the following steps: when multimedia character teaching is carried out, a teacher operates the computer 8 and selects the new characters, new words or idioms to be trained by using the character selection module 9;
step two: distributing a writing pen to each student, directly writing on a desk by the student according to the new words, new words or idiom information provided by a teacher, moving a track pen point 2 on the desk according to the writing action of the student, emitting red light by an infrared diode 5 through a lens assembly 4 from a positioning window 3, carrying out image shooting by a miniature camera 6 in cooperation with the focusing of the lens assembly, receiving image information by an image track analysis module 7, continuously shooting and analyzing the seen images, calculating the position offset direction and distance data of the track, and transmitting the obtained data to a computer 8;
step three: the computer 8 receives the position deviation direction and the distance data of the track, and generates a font by using the font generation module 10 to obtain the writing result of the student;
step four: the character judging module 11 compares the character pattern written by the student with the character pattern written by the student according to the accurate character pattern, analyzes whether the writing of the student is correct, and then the teacher performs subsequent teaching according to the obtained judgment result.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The utility model provides a multimedia teaching device, includes writing body of a pen (1), its characterized in that: the writing pen comprises a writing pen body (1), a track pen point (2) and a positioning window (3), wherein the bottom of the writing pen body (1) is fixedly provided with the track pen point, the bottom of the track pen point (2) is fixedly provided with the positioning window (3), the top of the positioning window (3) is fixedly provided with a lens component (4), a red light diode (5) and a micro camera (6) are fixedly arranged in the track pen point (2), and the red light diode (5) and the micro camera (6) are both matched with the lens component (4);
write pen body (1) inside fixed image orbit analysis module (7) that is used for receiving image information and converts into direction of motion and distance information, image orbit analysis module (7) output is connected with computer (8) that are used for receiving and handle orbit direction of motion and distance information, computer (8) inside is provided with and is used for choosing word selection module (9) of practicing the characters, is used for character pattern generation module (10) and the character judgment module (11) whether the character pattern that is used for contrast standard and writes according to the font of orbit information generation characters figure, computer (8) output is connected with display module (12) that is used for showing the characters image.
2. A multimedia teaching apparatus according to claim 1, wherein: the lens component (4) comprises a group of prism lenses and a group of round lenses, the output end of the red light diode (5) is arranged corresponding to the prism lenses, the input end of the miniature camera (6) is arranged corresponding to the round lenses, and the output end of the miniature camera (6) is vertically arranged corresponding to the positioning window (3).
3. A multimedia teaching apparatus according to claim 1, wherein: image orbit analysis module (7) pass through the bluetooth with computer (8) and are connected, write that body of a pen (1) is inside to be fixed and be provided with battery module (13), image orbit analysis module (7) and battery module (13) electric connection, display module (12) set up to one kind in jumbo size display, the projecting apparatus.
4. A multimedia teaching apparatus according to claim 1, wherein: the writing pen is characterized in that an operation key (14) is fixedly arranged in the middle of the surface of the writing pen body (1), and a power key (15) is fixedly arranged at the top end of the writing pen body (1).
5. A multimedia teaching apparatus according to claim 1, wherein: the writing pen comprises a writing pen body (1), a track pen point (2) and two support seats (16), wherein the two sides of the bottom end of the writing pen body (1) are fixedly provided with the support seats (16), the top of the track pen point (2) is fixedly provided with a connecting seat (17), and the two support seats (16) are movably connected with the connecting seat (17) through a rotating shaft (18).
6. A multimedia teaching apparatus according to claim 1, wherein: the track pen point is characterized in that a smooth pad (19) is fixedly arranged on the bottom end face of the track pen point (2), the smooth pad (19) is arranged in an annular shape, the smooth pad (19) is matched and sleeved with the positioning window (3), and the smooth pad (19) is made of a high-molecular polyethylene material.
7. A multimedia teaching method according to any one of claims 1-6, wherein:
the method comprises the following steps: when multimedia character teaching is carried out, a teacher operates the computer (8) and selects out new characters, new words or idioms to be trained by using the character selection module (9);
step two: each student is distributed with a writing pen, the students directly write on the desk according to the new words, new words or idiom information provided by the teacher, the track pen point (2) moves on the desk according to the writing action of the students, the infrared diode (5) emits red light which is emitted from the positioning window (3) through the lens component (4), the miniature camera (6) is matched with the focusing of the lens component to shoot images, the image track analysis module (7) receives the image information, continuously shoots the seen images and analyzes the images, calculates the position offset direction and distance data of the track, and transmits the obtained data to the computer (8);
step three: the computer (8) receives the position deviation direction and the distance data of the track, and generates a font by using the font generation module (10) to obtain the writing result of the student;
step four: the character judging module (11) compares the characters and the patterns written by the students according to the accurate characters and patterns, analyzes whether the writing of the students is correct or not, and then the teacher carries out subsequent teaching according to the obtained judgment result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010167589.XA CN111176471A (en) | 2020-03-11 | 2020-03-11 | Multimedia teaching method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010167589.XA CN111176471A (en) | 2020-03-11 | 2020-03-11 | Multimedia teaching method and device |
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| CN111176471A true CN111176471A (en) | 2020-05-19 |
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| CN202010167589.XA Pending CN111176471A (en) | 2020-03-11 | 2020-03-11 | Multimedia teaching method and device |
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| KR20040048580A (en) * | 2002-12-04 | 2004-06-10 | 김인광 | Pen-type pointing device with wheel function |
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2020
- 2020-03-11 CN CN202010167589.XA patent/CN111176471A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040048580A (en) * | 2002-12-04 | 2004-06-10 | 김인광 | Pen-type pointing device with wheel function |
| WO2006039852A1 (en) * | 2004-10-15 | 2006-04-20 | Hsi-Ching Tuan | Mouse pen |
| CN101393693A (en) * | 2008-09-12 | 2009-03-25 | 浙江大学 | A computer teaching method for writing Chinese characters |
| CN103744541A (en) * | 2014-01-26 | 2014-04-23 | 上海鼎为电子科技（集团）有限公司 | Writing pen, electronic terminal and writing system |
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| Title |
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| 张岩: "光学鼠标技术谱系", 《个人电脑》 * |
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Application publication date: 20200519 |
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