CN105139719B - It is a kind of directly to produce the electronic teacher pointer that dynamic emphasizes identification pattern - Google Patents
It is a kind of directly to produce the electronic teacher pointer that dynamic emphasizes identification pattern Download PDFInfo
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- CN105139719B CN105139719B CN201510654229.1A CN201510654229A CN105139719B CN 105139719 B CN105139719 B CN 105139719B CN 201510654229 A CN201510654229 A CN 201510654229A CN 105139719 B CN105139719 B CN 105139719B
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- rotating shaft
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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
- G09B17/00—Teaching reading
- G09B17/02—Line indicators or other guides or masks
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
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- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Position Input By Displaying (AREA)
Abstract
The electronic teacher pointer that dynamic emphasizes identification pattern can be directly produced the invention discloses a kind of, first laser output precision including shell and on shell, the left end of shell is provided with left light-emitting window, first laser output precision includes the first installing plate, rotating shaft, the first grating eyeglass, first laser transmitter and rotating shaft drive device, and the first installing plate is fixedly mounted on the inwall of the shell；Rotating shaft may be rotatably mounted on the first installing plate, and the first grating eyeglass is fixedly mounted thereon；Rotating shaft drive device is used to drive the rotating shaft to rotate；First laser transmitter is arranged on the first installing plate；First grating eyeglass is used for the laser transmitted and diffraction first laser transmitter is launched, so that the laser figure that sends and shown on screen from left light-emitting window after transmission and diffraction is rounded or ellipse.The present invention in actual use, with the features such as convenient, fast, suggesting effect is stronger, the scope of application is wider.
Description
Technical field
The invention belongs to electronic teacher pointer field, it can directly produce dynamic more particularly, to one kind and emphasize identification pattern
Electronic teacher pointer.
Background technology
, it is necessary to good explanation, exchange, a ditch in the area of activities such as teaching, engineering construction, floor manager, guide
Logical link.With explanation, exchange, the change of communication way, the communication between explanation person and audience has become to become increasingly complex, had
When the content object explained be separated by with explanation person and audience very remote, traditional instrument strengthened communication, draw audience's notice is for example general
Good auxiliaring effect can not be produced by leading to hand-held teacher's pointer.In order that explanation person can preferably attract the concern of audience, realize
One more humane communication exchange link, using some new aids is necessary in these area of activities.
In present teaching, computer and projector equipment are more and more widely used, its tutor auxiliary platform work
Has the electronic teacher pointer for the only simple control function of mouse that instrument has special and computer to be used in combination (see publication number
CN200420014950.1 Chinese patent), or the electronic teacher pointer that single red laser bright spot is indicated is (see publication number
CN94216245.5 Chinese patent), or realize different display effects (see publication number by artificially changing teacher's pointer head
201320689118.0 Chinese patent).Such teacher's pointer mark it is unobvious, or can not be freely generation such as wave or directly
Line, ellipse or round frame etc. emphasize identification pattern and carry out Special attention will be given to or to show explanation progress to tell about explanation person content,
Function is emphasized with less hommization dynamic marks, it is impossible to such as wave or straight line, ellipse are arbitrarily drawn as human hand held chalk
Circle or round frame etc. emphasize identification pattern, it is impossible to preferably attract the notice of audience, it is impossible to form one and explain, hand over well
Stream, communication link, neither one are strengthened memory and understood well, the effect of transmission information.
It is existing to produce setting-out, picture frame, amplify roaming, the electronic teacher pointer of marking operation is highlighted (see publication number
01228912.4 Chinese patent), it is necessary to computer is equipped with, other servicing units such as transmitting are received, complicated, body weight is big,
Inconvenient operation, it is expensive, and be only used for the place equipped with computer, such as showing slides in other no computer equipments
It can not be used in piece, engineering construction, floor manager, the occasion such as guide interpreting, its flexibility, versatility be not strong.
At present in the activity such as playing lantern slides, engineering construction, floor manager, guide, without special teacher's pointer backman
Tool, lacks and does not need allocation of computer and can directly use, flexibility, the electronic teacher pointer of highly versatile.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, having the invention provides one kind being capable of direct dynamic marks
The electronic teacher pointer of function is emphasized, the electronic teacher pointer can directly produce such as wave or straight line, the oval or a variety of dynamics of round frame
Identification pattern is emphasized, can arbitrarily change the shape size that identification pattern is emphasized in regulation, mark is arbitrarily dynamically emphasized with hommization
Know function, Special attention will be given to is carried out or to show explanation progress to tell about explanation person content.
To achieve the above object, it is proposed, according to the invention, can directly produce the electricity that dynamic emphasizes identification pattern there is provided a kind of
Sub- teacher's pointer, it is characterised in that the first laser output precision including shell and on shell, the left end of the shell is set
Left light-emitting window is equipped with, the first laser output precision includes the first installing plate, rotating shaft, the first grating eyeglass, first laser hair
Emitter and rotating shaft drive device, wherein,
First installing plate is fixedly mounted on the inwall of the shell；
The rotating shaft may be rotatably mounted on first installing plate；
The rotating shaft drive device is used to drive the rotating shaft to rotate；
The first laser transmitter is arranged on first installing plate, and it is located at the right side of the first grating eyeglass
Side；
The first grating eyeglass is fixedly mounted in the rotating shaft, and it is used to transmit and first laser described in diffraction is launched
The laser of device transmitting, so that the laser after transmission and diffraction shows circular or ellipse after being sent from the left light-emitting window on screen
It is circular；In addition, the first grating eyeglass makes the figure shown on screen circular and ellipse around the rotational energy of the shaft axis
Switched between circle.
Preferably, the second laser output precision in addition on shell, the second laser output precision includes
Second installing plate, second laser transmitter, the second grating eyeglass, wherein, second installing plate, second laser transmitter,
Two grating eyeglasses are respectively positioned in the shell, and second installing plate is fixedly mounted on the inwall of the shell, thereon from a left side
The second laser transmitter and the second grating eyeglass are installed successively to right direction；In addition, the right-hand member of the shell is also set up
There is right light-emitting window, the second grating eyeglass is used for the laser transmitted and second laser transmitter described in diffraction is launched, so that
Laser after transmission and diffraction on screen shows linear after being sent from the right light-emitting window.
Preferably, the second grating eyeglass is a wordline grating eyeglass, so as to show straight line on screen；Or, institute
The second grating eyeglass is stated for a word waveform grating eyeglass, so as to show wave on screen.
Preferably, the rotating shaft drive device includes swing pinion, sliding rack and the first push rod, and the swing pinion is consolidated
Dingan County is in the rotating shaft, and the sliding rack is engaged with the swing pinion and can moved left and right, and first push rod is consolidated
Surely it is connected on the sliding rack and can moves left and right, and the rotation can be driven by moving left and right for first push rod
Rotating disk and the axis of rotation, and then drive the first grating eyeglass to be rotated around the axis of the rotating shaft.
Preferably, the first laser output precision also includes sliding block, and the sliding block is slidably connected at described first and installed
It on plate and can horizontally slip, and the first laser transmitter is fixedly mounted on the sliding block.
Preferably, the first laser output precision also includes the second push rod and second push rod can horizontally slip,
And second push rod is fixedly connected with the sliding block.
Preferably, the second laser output precision also includes roller blind device and the 3rd push rod, and the roller blind device includes
The curtain plate of spool and installation on said reel, the spool may be rotatably mounted on the side wall of the shell, the curtain plate position
In in the shell, the 3rd push rod can be moved left and right and it moves left and right the spool can be driven to rotate, so that institute
State curtain plate curling or stretch, the curtain plate is arranged between the second grating eyeglass and the right light-emitting window, and it can hide
The fraction of laser light kept off after the second grating lens transmission and diffraction, so as to adjust the length of the light sent from the right light-emitting window
Degree.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
1) present invention uses the first grating eyeglass, and the light that first laser transmitter is sent is converted into oval or circular
Identification pattern is emphasized Deng dynamic, the shape size for emphasizing identification pattern can be adjusted, mark is arbitrarily dynamically emphasized with hommization
Function, Special attention will be given to is carried out or to show explanation progress to tell about explanation person content.
2) present invention uses the second grating eyeglass, and the light that second laser transmitter is sent is converted into linear dynamic
Identification pattern is emphasized, to be identified on screen.
3) roller blind device of the invention and the second grating eyeglass coordinate, and by the curling and stretching, extension of curtain door, can adjust screening
The area of the light of gear, so that the length that right light-emitting window sends linear laser pattern is adjusted, is conducive to raising in screen
The length of the whole content required emphasis.
4) present invention can make the pattern on screen between circular and ellipse by rotating the first grating eyeglass
Changed, therefore and need not change grating i.e. can be achieved different pattern between conversion；
5) sliding block of the invention can horizontally slip on the first installing plate, so as to adjust between first laser transmitter
Away from, and then the size of the pattern shown on screen can be adjusted；
6) present invention in actual use, with the spy such as convenient, fast, suggesting effect is stronger, the scope of application is wider
Point.
Brief description of the drawings
Fig. 1 is round identification pattern principle schematic；
Fig. 2 is line identification pattern principle schematic；
Fig. 3 is electronic teacher pointer overall structure principle schematic；
Fig. 4 is first laser output precision principle schematic diagram；
Fig. 5 is first laser output precision schematic three dimensional views；
Fig. 6 is second laser output precision principle schematic diagram；
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
Reference picture 1~Fig. 6, it is a kind of can directly produce the electronic teacher pointer that dynamic emphasizes identification pattern, including shell IV with
And the first laser output precision I on shell IV, the left end of the shell IV is provided with left light-emitting window 15, described first
Laser output precision I includes the first installing plate 8, rotating shaft, the first grating eyeglass 1, first laser transmitter 6 and rotating shaft driving dress
Put, wherein,
First installing plate 8 is fixedly mounted on the inwall of the shell IV；
The rotating shaft may be rotatably mounted on first installing plate 8, and the first grating eyeglass 1 is fixedly mounted thereon；
The rotating shaft drive device is used to drive the rotating shaft to rotate；
Preferably, the rotating shaft drive device includes swing pinion 4, the push rod 3 of sliding rack 2 and first, the rotary teeth
Wheel 4 is fixedly mounted in the rotating shaft, and the sliding rack 2 is engaged and can moved left and right with the swing pinion 4, and described first
Push rod 3 is fixedly connected on the sliding rack 2 and can moved left and right, and can be driven by moving left and right for the first push rod 3
The swing pinion 4 and the axis of rotation, and then drive the first grating eyeglass 1 to be rotated around the axis of the rotating shaft.Make
To be further preferred, a chute can be set on shell IV, and first push rod 3 can stretch out shell IV at chute,
So the first push rod 3 is moved with hand-lifting, so that it may so that axis of rotation.As it is another preferably, can also be on the side wall of shell IV
A T-shaped chute is opened in left-right direction, a sliding block is set at T-shaped chute, and the first push rod 3 is fixedly connected with a slide block, then slided
Sliding block, can also drive rotating shaft to rotate.
In addition, the rotating shaft drive device can also expose to shell IV, use hand for the knob in rotating shaft, knob
Turning knob, can also make axis of rotation
The first laser transmitter 6 is arranged on first installing plate 8, and it is located at the first grating eyeglass 1
Right；
The first grating eyeglass 1 is used for the laser transmitted and first laser transmitter 6 described in diffraction is launched, so that thoroughly
Penetrate that the figure for sending and being shown on screen 14 from the left light-emitting window 15 with the laser after diffraction is rounded or ellipse；In addition,
The first grating eyeglass 1 makes the figure shown on screen 14 between circular and ellipse around the rotational energy of the shaft axis
Switch over.
In addition, this electronic teacher pointer also includes the second laser output precision II being arranged on shell IV, the second laser
Output precision II includes the second installing plate 10, second laser transmitter 9, the second grating eyeglass 11, wherein, second installing plate
10th, second laser transmitter 9, the second grating eyeglass 11 are respectively positioned in the shell IV, and second installing plate 10 is fixedly mounted
On the inwall of the shell IV, the grating of second laser transmitter 9 and second is installed in direction from left to right successively thereon
Eyeglass 11；In addition, the right-hand member of the shell IV is additionally provided with right light-emitting window 16, the second grating eyeglass 11 is used to transmit and spread out
The laser that the second laser transmitter 9 is launched is penetrated, so that the laser after transmission and diffraction is sent from the right light-emitting window 16
And the figure shown on screen 14 is in linear.Preferably, the second grating eyeglass 11 is a wordline grating eyeglass, so that
Straight line is shown on screen 14, or the second grating eyeglass 11 is a word waveform grating eyeglass, so as to show on screen 14
Show wave.
Preferably, the first laser output precision I also includes sliding block 7, and the first laser transmitter 6 passes through the cunning
Block 7 is arranged on first installing plate 8.The first laser output precision I also includes the second push rod 5 and described second pushes away
Bar 5 can horizontally slip, and the sliding block 7 is slidably connected on first installing plate 8 and can horizontally slipped, on the sliding block 7 with
Second push rod 5 is fixedly connected, and second push rod 5 is used to drive the sliding block 7 to horizontally slip.As further preferred,
One chute can be set on shell IV, and second push rod 5 can stretch out shell IV at chute, so with hand-lifting dynamic the
Two push rods 5, it is possible to drive first laser transmitter 6 to move left and right.As it is another preferably, can also shell IV side wall
On open a T-shaped chute in left-right direction, a sliding block is set at T-shaped chute, and the second push rod 5 is fixedly connected with a slide block, then slides
Movable slider, also can drive first laser transmitter 6 to move left and right.
Preferably, the second laser output precision II is also included in the push rod 12 of roller blind device 13 and the 3rd, the present invention
Roller blind device 13 is the structure after existing commonplace use rolling-door structure diminution, empty with the installation for adapting to electronic teacher pointer
Between；The roller blind device 13 includes spool 131 and curtain plate 132, and the spool 131 may be rotatably mounted at the side wall of the shell IV
On, the curtain plate 132 is located in the shell IV, and the 3rd push rod 12 can be moved left and right and it moves left and right and can drive institute
State spool 131 to rotate, so that the curtain plate 132 is crimped or stretched, the curtain plate 132 is arranged at the second grating eyeglass 11
Between the right light-emitting window 16, and it can block some light after the transmission of the second grating eyeglass 11 and diffraction, from
And adjust the length of the light sent from the right light-emitting window 16.As further preferred, one can be set on shell IV
Chute, the 3rd push rod 12 can stretch out shell IV at chute, so move the 3rd push rod 12 with hand-lifting, it is possible to drive volume
Axle 131 is rotated.As another preferred, a T-shaped chute can also be opened in left-right direction on the side wall of shell IV, in T-shaped
One sliding block is set at chute, and the 3rd push rod 12 is fixedly connected with a slide block, then sliding slider, also can drive spool 131 to rotate.
In addition, by device of the transform linear motion of the 3rd push rod 12 for the rotary motion of spool 131, inside prior art
Have a lot, for example linkage rod slide block mechanism, rack and pinion mechanism etc..
Power supply module III is provided with the shell IV of the present invention, passes through the electronic original part in the electron teacher's pointer of power supply module III
Power supply, identification pattern is emphasized directly to produce dynamic.
As shown in figure 3, first laser output precision I can produce round frame or pattern of oval shapes on screen 14, and
The size of pattern can be adjusted.Its specific occurring principle is as follows：As shown in figure 4, the first grating eyeglass 1 can send out first laser
The beam of laser point diverging that emitter 6 is sent turns into circle framework laser pattern.The second push rod 5 is now fixed, is pushed away by promoting first
Bar 3, rack and pinion engagement transmission, swing pinion 4 drives the first grating eyeglass 1 to be pivoted, with the end of the first grating eyeglass 1
Face and the change of the angle theta of the plane perpendicular to laser rays, can change into pattern of oval shapes by circular laser pattern；Work as angle
θ be the 0 ° i.e. end face of the first grating eyeglass 1 perpendicular to laser rays when, the pattern shown on screen 14 is circle, when 0 ° of angle
During 90 ° of ＜ θ ＜, its pattern is ellipse；If now fixing the first push rod 3, promote the second push rod 5, first laser transmitter 6 with
Slided with sliding block 7, change the distance between first laser transmitter 6 and the first grating eyeglass 1 L, the size of pattern can be adjusted.
As shown in figure 3, second laser output precision II can produce linear pattern on screen 14, and it can be adjusted
Length scale.Its specific occurring principle is as follows：As shown in fig. 6, the second grating eyeglass 11 can send second laser transmitter 9
Beam of laser point diverge to it is linear (be specifically in-line or waveform, depend on the second grating eyeglass 11 use a wordline light
Grid eyeglass or a word wave eyeglass).Because the position of the grating eyeglass 11 of second laser transmitter 9 and second is fixed
, now by curtain door shield portions light, by promoting the 3rd push rod 12 so that roller blind device 13 is folded or stretched, from
And reach the purpose of the length of regulation linear pattern.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (6)
1. a kind of can directly produce the electronic teacher pointer that dynamic emphasizes identification pattern, it is characterised in that including shell and installation
First laser output precision on shell, the left end of the shell is provided with left light-emitting window, the first laser output precision
Including the first installing plate, rotating shaft, the first grating eyeglass, first laser transmitter and rotating shaft drive device, wherein,
First installing plate is fixedly mounted on the inwall of the shell；
The rotating shaft may be rotatably mounted on first installing plate；
The rotating shaft drive device is used to drive the rotating shaft to rotate；
The first laser transmitter is arranged on first installing plate, and it is located at the right of the first grating eyeglass；
The first grating eyeglass is fixedly mounted in the rotating shaft, and it is used to transmit and first laser transmitter described in diffraction is sent out
The laser penetrated, so that the laser after transmission and diffraction shows circular or oval on screen after being sent from the left light-emitting window
Shape；In addition, the first grating eyeglass makes the figure shown on screen circular and oval around the rotational energy of the shaft axis
Switched between shape；
The rotating shaft drive device includes swing pinion, sliding rack and the first push rod, and the swing pinion is fixedly mounted on institute
State in rotating shaft, the sliding rack is engaged with the swing pinion and can moved left and right, first push rod is fixedly connected on institute
State on sliding rack and can move left and right, and the swing pinion and institute can be driven by moving left and right for first push rod
Axis of rotation is stated, and then drives the first grating eyeglass to be rotated around the axis of the rotating shaft.
2. a kind of dynamic that can directly produce according to claim 1 emphasizes the electronic teacher pointer of identification pattern, its feature exists
In, in addition to the second laser output precision on shell, the second laser output precision includes the second installing plate, the
Dual-laser transmitter, the second grating eyeglass, wherein, second installing plate, second laser transmitter, the second equal position of grating eyeglass
In in the shell, second installing plate is fixedly mounted on the inwall of the shell, and direction from left to right is successively thereon
The second laser transmitter and the second grating eyeglass are installed；In addition, the right-hand member of the shell is additionally provided with right light-emitting window, it is described
Second grating eyeglass is for transmiting the laser launched with second laser transmitter described in diffraction, so that transmission and swashing after diffraction
Light on screen shows linear after being sent from the right light-emitting window.
3. a kind of dynamic that can directly produce according to claim 2 emphasizes the electronic teacher pointer of identification pattern, its feature exists
In the second grating eyeglass is a wordline grating eyeglass, so as to show straight line on screen；Or, second grating mirror
Piece is a word waveform grating eyeglass, so as to show wave on screen.
4. a kind of dynamic that can directly produce according to claim 1 emphasizes the electronic teacher pointer of identification pattern, its feature exists
In the first laser output precision also includes sliding block, and the sliding block is slidably connected on first installing plate and can left and right
Slide, and the first laser transmitter is fixedly mounted on the sliding block.
5. a kind of dynamic that can directly produce according to claim 4 emphasizes the electronic teacher pointer of identification pattern, its feature exists
In, the first laser output precision also includes the second push rod and second push rod can horizontally slip, and described second
Push rod is fixedly connected with the sliding block.
6. a kind of dynamic that can directly produce according to claim 2 emphasizes the electronic teacher pointer of identification pattern, its feature exists
In the second laser output precision also includes roller blind device and the 3rd push rod, and the roller blind device includes spool and is arranged on
Curtain plate on the spool, the spool may be rotatably mounted on the side wall of the shell, and the curtain plate is located in the shell,
3rd push rod can be moved left and right and it moves left and right the spool can be driven to rotate, so that curtain plate curling or stretching
Exhibition, the curtain plate is arranged between the second grating eyeglass and the right light-emitting window, and it can block second grating
Fraction of laser light after lens transmission and diffraction, so as to adjust the length of the light sent from the right light-emitting window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510654229.1A CN105139719B (en) | 2015-10-12 | 2015-10-12 | It is a kind of directly to produce the electronic teacher pointer that dynamic emphasizes identification pattern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510654229.1A CN105139719B (en) | 2015-10-12 | 2015-10-12 | It is a kind of directly to produce the electronic teacher pointer that dynamic emphasizes identification pattern |
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| Publication Number | Publication Date |
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| CN105139719A CN105139719A (en) | 2015-12-09 |
| CN105139719B true CN105139719B (en) | 2017-08-01 |
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| CN201510654229.1A Active CN105139719B (en) | 2015-10-12 | 2015-10-12 | It is a kind of directly to produce the electronic teacher pointer that dynamic emphasizes identification pattern |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781848A (en) * | 2016-12-16 | 2017-05-31 | 朱虹斐 | Laser pointer |
| CN107909884B (en) * | 2017-12-27 | 2019-09-20 | 浙江水利水电学院 | A kind of Intelligent Laser pen and laser width adjusting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2346018Y (en) * | 1998-08-28 | 1999-10-27 | 欧普康光电(厦门)有限公司 | New-structure of laser indicator |
| CN200979759Y (en) * | 2006-04-25 | 2007-11-21 | 韩毓敏 | A laser fescue |
| CN101408672A (en) * | 2007-10-10 | 2009-04-15 | 先进微系统科技股份有限公司 | Laser indication device |
| CN204576876U (en) * | 2015-05-12 | 2015-08-19 | 湖南理工职业技术学院 | Electronic multimedia teaching pen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020087504A (en) * | 2001-05-10 | 2002-11-23 | 김병철 | Perpendicular/horizontal indicator |
| US8896899B1 (en) * | 2013-05-15 | 2014-11-25 | Zhen Tang | Laser marker |
-
2015
- 2015-10-12 CN CN201510654229.1A patent/CN105139719B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2346018Y (en) * | 1998-08-28 | 1999-10-27 | 欧普康光电(厦门)有限公司 | New-structure of laser indicator |
| CN200979759Y (en) * | 2006-04-25 | 2007-11-21 | 韩毓敏 | A laser fescue |
| CN101408672A (en) * | 2007-10-10 | 2009-04-15 | 先进微系统科技股份有限公司 | Laser indication device |
| CN204576876U (en) * | 2015-05-12 | 2015-08-19 | 湖南理工职业技术学院 | Electronic multimedia teaching pen |
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