CN113284395A - Laser pen for multimedia teaching - Google Patents
Laser pen for multimedia teaching Download PDFInfo
- Publication number
- CN113284395A CN113284395A CN202110576687.3A CN202110576687A CN113284395A CN 113284395 A CN113284395 A CN 113284395A CN 202110576687 A CN202110576687 A CN 202110576687A CN 113284395 A CN113284395 A CN 113284395A
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- China
- Prior art keywords
- laser
- lens group
- shell
- key block
- conversion lens
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0966—Cylindrical lenses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Lasers (AREA)
Abstract
The invention discloses a laser pen for multimedia teaching, which comprises a shell, a laser generating unit and a lens group unit, wherein the lens group unit comprises a conversion lens group, a rear fixed lens group, a movable lens group and a front fixed lens group, and the conversion lens group comprises a first conversion lens and a second conversion lens, wherein the first conversion lens can enable laser beams to generate line-section-shaped light spots on an optical screen, and the second conversion lens can enable the laser beams to generate circular-ring-shaped light spots on the optical screen. The invention can generate both annular light spots and line segment light spots, can switch between the annular light spots and the line segment light spots according to actual needs, and can adjust the size of the annular light spots and the length of the line segment light spots according to the actual needs.
Description
Technical Field
The invention belongs to the technical field of multimedia teaching, and particularly relates to a laser pen for multimedia teaching.
Technical Field
With the rapid development and popularization of computer technology, multimedia teaching has gradually replaced the traditional teaching mode, and has become a trend of modern education. At present, multimedia teaching systems are constructed in colleges and universities and primary and secondary schools. In the multimedia teaching, because the traditional pointer is inconvenient to use for guiding, the laser pen using laser guiding is invented, the existing laser pen is a light spot on a screen, and the guided object is not a point but a piece or a line under most conditions, and a user ceaselessly moves the light spot to obtain the effect of guiding the piece or the line, so that the method not only increases the burden of the user, but also is inaccurate in guiding, easily causes the distraction of students, and is easy to cause the fatigue of the students.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a laser pen for multimedia teaching.
The technical scheme adopted by the invention is as follows: a laser pen for multimedia teaching comprises a shell, a laser generating unit and a lens group unit;
the shell is cylindrical, a cavity is formed in the shell, a first key block and a second key block are sequentially arranged on the outer side wall of the shell and are communicated with the cavity of the shell respectively, the first key block can slide in the vertical direction of the axial direction of the shell, and the second key block can slide in the axial direction of the shell;
the laser generating unit is arranged in the cavity of the shell and used for generating laser beams, the laser generating unit comprises a power supply, a sliding rheostat, a switch and a laser generator which are sequentially connected, wherein the switch is fixed on the second key block, the switch is pressed to switch on a circuit, the switch is released to switch off the circuit, and a sliding block of the sliding rheostat is fixedly connected with the second key block, so that the current in the circuit is reduced when the second key block moves forwards, and the current in the circuit is increased when the second key block moves backwards;
the lens group unit is arranged in the cavity of the shell and positioned right in front of the laser generator, is used for changing the shape and size of the laser beam generated by the laser generator and comprises a conversion lens group, a rear fixed lens group, a movable lens group and a front fixed lens group; the conversion lens group is fixedly arranged right in front of the laser generator and used for changing the shape of a laser beam, the conversion lens group comprises a rotating block, a first conversion lens and a second conversion lens, the first conversion lens and the second conversion lens are arranged on the rotating block, the rotating block is fixedly connected with a first key block, the rotating block can be driven to rotate by shifting the first key block, the rotating block can enable the centers of the first conversion lens and the second conversion lens to be respectively aligned with the laser beam, the first conversion lens is a cylindrical lens, the first conversion lens can enable the laser beam to generate a line-shaped light spot on the light screen, the incident surface of the second conversion lens is a spherical surface, the emergent surface of the second conversion lens is conical, and the second conversion lens can enable the laser beam to generate a circular-shaped light spot on the light screen; the rear fixed lens group is fixedly arranged right in front of the conversion lens group, is used for converting divergent laser beams into parallel laser beams and is a positive lens; the movable lens group is arranged in front of the rear fixed lens group and is fixedly connected with the second key block, the movable lens group can be driven to move back and forth by moving the second key block, the second key block is moved forward to enable light spots generated by the laser beam on the optical screen to be gradually reduced, the second key block is moved backward to enable the light spots generated by the laser beam on the optical screen to be gradually increased, and the movable lens group is a negative lens; the front fixed lens group is fixedly arranged in front of the movable lens group and is positioned at the foremost end of the shell, the front fixed lens group is used for re-dispersing the laser beam, and the front fixed lens group is a negative lens.
Furthermore, the laser generation unit also comprises a stroboscopic device which can enable the laser transmitter to generate stroboscopic effect, the stroboscopic device comprises a pulse generator and a field-effect tube, the negative input end of the pulse generator and the drain electrode of the field-effect tube are respectively connected with the negative electrode of the power supply, the positive input end of the pulse generator and the positive electrode of the laser transmitter are connected with the positive electrode of the power supply through a switch and a sliding rheostat, the output end of the pulse generator is connected with the grid electrode of the field-effect tube, and the source electrode of the field-effect tube is connected with the negative electrode of the laser transmitter.
Furthermore, the laser pen for multimedia teaching further comprises a PPT wireless page turning device, wherein the PPT wireless page turning device comprises a transmitting unit and a receiving unit; the transmitting unit is arranged on the shell and comprises a coding chip and an ASK wireless transmitting chip, wherein a coding pin of the coding chip is connected with a PPT (power point) upturning key and a PPT downturning key, and the PPT upturning key and the PPT downturning key are arranged on the outer side wall of the shell; the receiving unit comprises a wireless receiver capable of receiving the PPT page turning instruction sent by the transmitting unit and a USB module capable of connecting the wireless receiver with a USB interface of the computer.
Furthermore, the coding chip is a coding chip TDH2240, the ASK wireless transmitting chip is an ASK wireless transmitting chip MICRF113, and the wireless receiver is a wireless receiving chip RF 83B.
The use method of the invention comprises the following steps: when the guided object is a piece, the first key block is firstly shifted to enable the center of the second conversion lens to be aligned with the laser generator, the switch is pressed, the annular light spot is displayed on the light screen, the size of the annular light spot can be adjusted by moving the second key block, and the laser intensity emitted by the laser generator is automatically changed along with the change of the size of the annular light spot, so that the annular light spot displayed on the light screen is not darkened due to the enlargement and is not lightened due to the reduction; when the guided object is in a line, the first key block is firstly shifted to enable the center of the first conversion lens to be aligned with the laser generator, the switch is pressed, line segment light spots are displayed on the light screen, the length of the line segment light spots can be adjusted by moving the second key block, the laser intensity emitted by the laser generator is automatically changed along with the change of the length of the line segment light spots, and the line segment light spots displayed on the light screen are enabled not to be darkened due to lengthening and not lightened due to shortening; the annular light spot or the line-segment light spot is a flickering light spot; when the PPT needs to be turned, the PPT up-turning key and the PPT down-turning key can be pressed.
The invention has the beneficial effects that: the laser pen can generate annular light spots and line segment light spots, can switch between the annular light spots and the line segment light spots according to actual needs, can adjust the size of the annular light spots and the length of the line segment light spots according to the actual needs, and can automatically change the laser intensity emitted by the laser generator while adjusting the size of the annular light spots and the length of the line segment light spots, so that the light spots displayed on the light screen are not darkened due to enlargement or lengthening, and are not lightened due to reduction or shortening of the light spots, and the light spot brightness is basically constant; the annular light spots or the line-segment light spots are all flashing light spots, so that the attention of students can be attracted, and the guiding effect is enhanced; the laser pen also comprises a PPT wireless page turning device, and the page turning of the PPT can be conveniently carried out.
Drawings
Fig. 1 is a schematic diagram of the appearance structure of the present invention.
Fig. 2 is a block diagram of the laser generating unit according to the present invention.
FIG. 3 is a block diagram of the structure of the lens assembly unit of the present invention.
FIG. 4 is a schematic diagram of a second convertible lens structure according to the present invention.
Fig. 5 is a block diagram of a PPT wireless page-turning device according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A laser pen for multimedia teaching comprises a shell 1, a laser generating unit and a lens group unit;
the shell 1 is cylindrical, a cavity is arranged in the shell 1, a first key block 2 and a second key block 3 are sequentially arranged on the outer side wall of the shell 1, the first key block 2 and the second key block 3 are respectively communicated with the cavity of the shell 1, the first key block 2 can slide in the axial vertical direction of the shell 1, and the second key block 3 can slide in the axial direction of the shell 1;
the laser generating unit is arranged in a cavity of the shell and used for generating laser beams, the laser generating unit comprises a power supply, a sliding rheostat, a switch 4 and a laser generator which are sequentially connected, wherein the switch 4 is fixed on the second key block 3, the switch 4 is pressed to be connected with a circuit, the switch 4 is loosened to disconnect the circuit, and a sliding block of the sliding rheostat is fixedly connected with the second key block 3, so that the current in the circuit is reduced when the second key block 3 moves forwards, and the current in the circuit is increased when the second key block 3 moves backwards;
the lens group unit is arranged in the cavity of the shell and positioned right in front of the laser generator, is used for changing the shape and size of the laser beam generated by the laser generator and comprises a conversion lens group, a rear fixed lens group, a movable lens group and a front fixed lens group; the conversion lens group is fixedly arranged right in front of the laser generator and used for changing the shape of a laser beam, the conversion lens group comprises a rotating block, a first conversion lens and a second conversion lens, the first conversion lens and the second conversion lens are arranged on the rotating block, the rotating block is fixedly connected with a first key block, the rotating block can be driven to rotate by shifting the first key block, the rotating block can enable the centers of the first conversion lens and the second conversion lens to be respectively aligned with the laser beam, the first conversion lens is a cylindrical lens, the first conversion lens can enable the laser beam to generate a line-shaped light spot on the light screen, an incident surface 7 of the second conversion lens is a spherical surface, an emergent surface 8 of the second conversion lens is a conical surface, and the second conversion lens can enable the laser beam to generate a circular-shaped light spot on the light screen; the rear fixed lens group is fixedly arranged right in front of the conversion lens group, is used for converting divergent laser beams into parallel laser beams and is a positive lens; the movable lens group is arranged in front of the rear fixed lens group and is fixedly connected with the second key block, the movable lens group can be driven to move back and forth by moving the second key block, the second key block is moved forward to enable light spots generated by the laser beam on the optical screen to be gradually reduced, the second key block is moved backward to enable the light spots generated by the laser beam on the optical screen to be gradually increased, and the movable lens group is a negative lens; the front fixed lens group is fixedly arranged in front of the movable lens group and is positioned at the foremost end of the shell, the front fixed lens group is used for re-dispersing the laser beam, and the front fixed lens group is a negative lens.
Furthermore, the laser generation unit also comprises a stroboscopic device which can enable the laser transmitter to generate stroboscopic effect, the stroboscopic device comprises a pulse generator and a field-effect tube, the negative input end of the pulse generator and the drain electrode of the field-effect tube are respectively connected with the negative electrode of the power supply, the positive input end of the pulse generator and the positive electrode of the laser transmitter are connected with the positive electrode of the power supply through a switch and a sliding rheostat, the output end of the pulse generator is connected with the grid electrode of the field-effect tube, and the source electrode of the field-effect tube is connected with the negative electrode of the laser transmitter.
Further, the laser pen for multimedia teaching further comprises a PPT wireless page turning device, wherein the PPT wireless page turning device comprises a transmitting unit and a receiving unit 9; the transmitting unit is arranged on the shell and comprises a coding chip and an ASK wireless transmitting chip, wherein a coding pin of the coding chip is connected with a PPT (power point) upturning key 5 and a PPT downturning key 6, and the PPT upturning key 5 and the PPT downturning key 6 are arranged on the outer side wall of the shell; the receiving unit 9 comprises a wireless receiver capable of receiving the PPT page turning instruction sent by the transmitting unit, and a USB module capable of connecting the wireless receiver with a USB interface of a computer.
Furthermore, the coding chip is a coding chip TDH2240, the ASK wireless transmitting chip is an ASK wireless transmitting chip MICRF113, and the wireless receiver is a wireless receiving chip RF 83B.
Claims (4)
1. A laser pen for multimedia teaching is characterized in that: the laser pen for multimedia teaching comprises a shell, a laser generating unit and a lens group unit;
the shell is cylindrical, a cavity is formed in the shell, a first key block and a second key block are sequentially arranged on the outer side wall of the shell and are communicated with the cavity of the shell respectively, the first key block can slide in the vertical direction of the axial direction of the shell, and the second key block can slide in the axial direction of the shell;
the laser generating unit is arranged in the cavity of the shell and used for generating laser beams, the laser generating unit comprises a power supply, a sliding rheostat, a switch and a laser generator which are sequentially connected, wherein the switch is fixed on the second key block, the switch is pressed to switch on a circuit, the switch is released to switch off the circuit, and a sliding block of the sliding rheostat is fixedly connected with the second key block, so that the current in the circuit is reduced when the second key block moves forwards, and the current in the circuit is increased when the second key block moves backwards;
the lens group unit is arranged in the cavity of the shell and positioned right in front of the laser generator, is used for changing the shape and size of the laser beam generated by the laser generator and comprises a conversion lens group, a rear fixed lens group, a movable lens group and a front fixed lens group; the conversion lens group is fixedly arranged right in front of the laser generator and used for changing the shape of a laser beam, the conversion lens group comprises a rotating block, a first conversion lens and a second conversion lens, the first conversion lens and the second conversion lens are arranged on the rotating block, the rotating block is fixedly connected with a first key block, the rotating block can be driven to rotate by shifting the first key block, the rotating block can enable the centers of the first conversion lens and the second conversion lens to be respectively aligned with the laser beam, the first conversion lens is a cylindrical lens, the first conversion lens can enable the laser beam to generate a line-shaped light spot on the light screen, the incident surface of the second conversion lens is a spherical surface, the emergent surface of the second conversion lens is conical, and the second conversion lens can enable the laser beam to generate a circular-shaped light spot on the light screen; the rear fixed lens group is fixedly arranged right in front of the conversion lens group, is used for converting divergent laser beams into parallel laser beams and is a positive lens; the movable lens group is arranged in front of the rear fixed lens group and is fixedly connected with the second key block, the movable lens group can be driven to move back and forth by moving the second key block, the second key block is moved forward to enable light spots generated by the laser beam on the optical screen to be gradually reduced, the second key block is moved backward to enable the light spots generated by the laser beam on the optical screen to be gradually increased, and the movable lens group is a negative lens; the front fixed lens group is fixedly arranged in front of the movable lens group and is positioned at the foremost end of the shell, the front fixed lens group is used for re-dispersing the laser beam, and the front fixed lens group is a negative lens.
2. The laser pen for multimedia teaching as claimed in claim 1, wherein: the laser generating unit further comprises a stroboscopic device capable of enabling the laser transmitter to generate stroboscopic effect, the stroboscopic device comprises a pulse generator and a field-effect tube, the negative input end of the pulse generator and the drain electrode of the field-effect tube are respectively connected with the negative electrode of a power supply, the positive input end of the pulse generator and the positive electrode of the laser transmitter are connected with the positive electrode of the power supply through a switch and a sliding rheostat, the output end of the pulse generator is connected with the grid electrode of the field-effect tube, and the source electrode of the field-effect tube is connected with the negative electrode of the laser transmitter.
3. The laser pen for multimedia teaching as claimed in claim 1, wherein: the laser pen for multimedia teaching further comprises a PPT wireless page turning device, wherein the PPT wireless page turning device comprises a transmitting unit and a receiving unit; the transmitting unit is arranged on the shell and comprises a coding chip and an ASK wireless transmitting chip, wherein a coding pin of the coding chip is connected with a PPT (power point) upturning key and a PPT downturning key, and the PPT upturning key and the PPT downturning key are arranged on the outer side wall of the shell; the receiving unit comprises a wireless receiver capable of receiving the PPT page turning instruction sent by the transmitting unit and a USB module capable of connecting the wireless receiver with a USB interface of the computer.
4. A laser pointer for multimedia teaching as claimed in claim 3, wherein: the code chip is code chip TDH2240, the ASK wireless transmission chip is ASK wireless transmission chip MICRF113, wireless receiver is wireless receiving chip RF 83B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110576687.3A CN113284395B (en) | 2021-05-19 | 2021-05-19 | Laser pen for multimedia teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110576687.3A CN113284395B (en) | 2021-05-19 | 2021-05-19 | Laser pen for multimedia teaching |
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| Publication Number | Publication Date |
|---|---|
| CN113284395A true CN113284395A (en) | 2021-08-20 |
| CN113284395B CN113284395B (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110576687.3A Active CN113284395B (en) | 2021-05-19 | 2021-05-19 | Laser pen for multimedia teaching |
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| US20190219942A1 (en) * | 2018-01-18 | 2019-07-18 | Canon Kabushiki Kaisha | Image forming apparatus and control method thereof |
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2021
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|---|---|---|---|---|
| CN101435909A (en) * | 2008-11-26 | 2009-05-20 | 王国力 | Beam enlarging lens |
| CN102074895A (en) * | 2010-11-19 | 2011-05-25 | 无锡亮源激光技术有限公司 | Double-chip laser illuminator |
| CN102654270A (en) * | 2011-03-04 | 2012-09-05 | 海洋王照明科技股份有限公司 | Condenser lens of LED (light emitting diode) |
| US20130148925A1 (en) * | 2011-12-09 | 2013-06-13 | Martin H. Muendel | Varying beam parameter product of a laser beam |
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| Publication number | Publication date |
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| CN113284395B (en) | 2022-12-02 |
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