CN105182667A - Novel laser projector - Google Patents
Novel laser projector Download PDFInfo
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- CN105182667A CN105182667A CN201510600663.1A CN201510600663A CN105182667A CN 105182667 A CN105182667 A CN 105182667A CN 201510600663 A CN201510600663 A CN 201510600663A CN 105182667 A CN105182667 A CN 105182667A
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- deflection angle
- electromotive force
- laser
- vibrating mirror
- back electromotive
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Abstract
The invention discloses a novel laser projector comprising the following elements: a laser light source; a modulator modulating the intensity of a laser beam; a vibration mirror used for horizontally deflecting the laser beam with modulated intensity; an electromagnetically-driven scanning lens used for scanning the laser from the laser light source; a deflection angle detector used for detecting a deflection angle of the vibration mirror; a deflection angle regulator used for adjusting the deflection angle of the vibration mirror; a counter electromotive force detection unit used for detecting the counter electromotive force generated by driving the electromagnetically-driven scanning lens; and a control module. Whether the electromagnetically-driven scanning lens is driven by a sufficient deflection angle or not can be determined by scanning whether the value of the counter electromotive force generated by driving has exceeded the preset threshold or not, thereby ensuring starting safety; the deflection angle detector and the deflection angle regulator can adjust the deflection angle of the vibration mirror, thereby preventing the vibration mirror from being damaged by overly driving, and the laser projector can continuously project images at stable deflection intervals.
Description
Technical field
The invention belongs to Color Laser Projection Technology field, particularly a kind of new pattern laser projector.
Background technology
Projector has become the product that modern business personage commonly uses.With existing numerical digit optical processor (DigitalLightProcession, or silicon wafer light technology (LiquidCrystalonSilicon DLP), LCoS) compare, laser-projector because its power consumption is less, projection image larger (can more than 100 cun) and become the product of people's favor without the need to the advantage of focusing.As the laser-projector taking laser instrument as light source, it, by the scanning mirror of the electromagnetic drive mode of reciprocally swinging, makes the laser from LASER Light Source show image in the enterprising line scanning of screen.Scanning mirror has density according to its size and material, hardness and the intrinsic resonant frequency determined, by driving with this resonant frequency, scanning mirror can be made to swing with maximum pivot angle, thus with the larger image of low electric power display.
Raster scanning based on laser beam projects and some laser-projectors of showing image have carry out in tens kHz to 100kHz scopes horizontal scanning high speed of actions and with ± 20 ° or with great visual angle for the high deflection angle of representative.For performing scan process with so high speed of actions and a kind of method with high deflection angle is, use the vibrating mirror be operated near its resonance point.
Vibrating mirror can have high deflection angle in the little operating frequency range near its resonant frequency.But if frequency of operation off-resonance frequence, so the deflection angle of vibrating mirror will greatly reduce.Resonant frequency depends on the material, shape, temperature etc. of vibrating mirror, and is easy to change due to the cause of production difference and working temperature.Therefore, in order to operating vibration mirror is by high deflection angle, resonant frequency and frequency of operation must be made to keep close as much as possible each other.Therefore, adjustment vibrating mirror makes its resonant frequency close to frequency of operation, or makes frequency of operation close to its resonant frequency.
Along with deflection angle becomes larger, more impossible operating vibration mirror.When needs operating vibration mirror is by high deflection angle, ites is desirable to control vibrating mirror, make its deflection angle can not exceed predetermined deflection angle.When working under the frequency of operation of vibrating mirror at off-resonance frequence, the intensity due to input signal needs input signal strength when being operated under resonant frequency higher than vibrating mirror, therefore for driving the circuit of vibrating mirror to stand the load added.
In order to adjust deflection angle with operating vibration mirror by high deflection angle, wishing that the deflection angle of vibrating mirror can not exceed predetermined deflection angle, and wishing that vibrating mirror works under resonant frequency.
In order to adjust the deflection angle of vibrating mirror, accurately must detect the deflection angle of vibrating mirror, and according to the deflection angle detected, vibrating mirror being regulated.And existing laser-projector is when demonstrating, and in order to indicate the Current Content of lecture, people often need to be equipped with a laser pen specially, thus are not having all can have much inconvenience in the situation such as laser pen or laser pen loss.
Summary of the invention
The object of the invention is to customer service the deficiencies in the prior art, whether the value of the back electromotive force providing a kind of driving by electromagnetic drive type scanning mirror to produce exceedes threshold decision scanning through whether being driven with enough pivot angle sizes, guarantees security when starting; And by the new pattern laser projector that deflection angle detecting device and deflection angle adjuster regulate vibrating mirror deflection angle.
The object of the invention is to be achieved through the following technical solutions: a kind of new pattern laser projector, comprising:
LASER Light Source, for Emission Lasers bundle;
Modulator, for carrying out the intensity of modulating lasering beam according to the image that will project;
Vibrating mirror, for the laser beam of horizontal deflection intensity ovennodulation;
Electromagnetic drive type scanning mirror, scans for making the laser from LASER Light Source;
Deflection angle detecting device, for detecting the deflection angle of described vibrating mirror;
Deflection angle adjuster, for the deflection angle based on the described vibrating mirror detected, adjusts the deflection angle of described vibrating mirror;
Back electromotive force detecting unit, for when laser-projector starts, detects the back electromotive force produced owing to driving electromagnetic drive type scanning mirror;
Control module, processes for the signal collected deflection angle detecting device and back electromotive force detecting unit, and controls the LASER Light Source of projector inside, vibrating mirror driver element, scanning mirror driver element and deflection angle adjuster;
Described signal input device is connected with control module, control module connects LASER Light Source, LASER Light Source by laser driver and connects modulator, vibrating mirror and scanning mirror successively, control module is connected with vibrating mirror by vibrating mirror driver element, control module connects scanning mirror by scanning mirror driver element, control module is also connected with modulator by video signal processing unit, is connected on vibrating mirror adjustment period of deflection angle detecting device and deflection angle.
Further, described control module comprises:
CPU, storage unit, and
Cursor control unit, for generate can movement in real time cursor signal and be sent to CPU;
Back electromotive force identifying unit, for judging whether the value of the back electromotive force detected by back electromotive force detecting unit exceedes default threshold value;
Frequency judging unit, for being judged to be by back electromotive force identifying unit whether number of times that the value of back electromotive force exceedes default threshold value is more than or equal to stipulated number and judges;
Light source control unit, for judging that at frequency judging unit the number of times that the value of back electromotive force is judged as the threshold value exceeding regulation is more than or equal to stipulated number, makes LASER Light Source start lighting;
The input of back electromotive force identifying unit is connected with back electromotive force detecting unit, connects CPU after the output number of pass times judging unit of back electromotive force identifying unit; The input of cursor control unit is connected with signal input device, and the output of cursor control unit connects CPU; The output of CPU is connected with cursor control unit, and the output of cursor control unit connects laser driver; The output of CPU connects deflection angle adjuster; CPU also links with storage unit.
Further, also collimating lens is provided with between described modulator and vibrating mirror; Also being provided with a changing unit in described control module, when for not being judged to be that described phase differential is in the scope of regulation by back electromotive force identifying unit at the appointed time, changing the drive condition of described electromagnetic drive type scanning mirror.
Further, described deflection angle detecting device comprises photodetector array, described photodetector array comprises the multiple photodetectors being parallel to horizontal scan direction arrangement, vibrating mirror makes laser beam deflect along horizontal scan direction, it is outside that photodetector array is configured in image projection district, and be configured in the wide region comprising laser beam horizontal scanning scope.The photodetector of described photodetector array does not arrange at equal intervals, and compared with photodetector array center, the photodetector in photodetector array is more intensive in the end of photodetector array.Photodetector array comprises transparency carrier and is configured in the semiconductor layer on transparency carrier.
Further, described deflection angle adjuster is for adjusting frequency and the intensity of the drive singal of vibrating mirror, deflection angle adjuster is consistent by the resonant frequency of the frequency with vibrating mirror that make the drive singal of vibrating mirror, then change the intensity of the drive singal of described vibrating mirror, adjust the deflection angle of described vibrating mirror.
Further, described cursor control unit comprises one group for controlling the Trackpad of cursor movement or controlling button, and one group for control cursor shape change control button, the acceptance division coupled with CPU and the remote control portion be coupled with this acceptance division, and this remote control portion is equiped with position transducer, this remote control portion detects change in location by position transducer and sends position variation signal to acceptance division.
The invention has the beneficial effects as follows:
1, laser-projector of the present invention is when starting, and in during the pivot angle of electromagnetic drive type scanning mirror does not reach enough sizes, LASER Light Source not lighting, just makes LASER Light Source start lighting after the pivot angle of electromagnetic drive type scanning mirror has reached enough sizes; Can avoid due to be in guarantee pivot angle not yet fully state under scanning mirror, cause the laser sent from LASER Light Source to be radiated in less scope, eliminate the danger that human body is damaged, improve laser-projector start time security; In addition, because whether electromagnetic drive type scanning mirror is driven with enough pivot angle sizes, whether exceed defined threshold according to the value of back electromotive force produced by this driving and carry out judging, so security when can guarantee startup by reliable and simple method;
2, photodetector array for the deflection angle of the vibrating mirror of measuring and adjustation horizontal scanning is configured to the horizontal scan direction being parallel to laser beam, and be configured in the scope wider than the deflection angle ranges of the laser beam that will adjust, even if deflection angle is very little, laser-projector also can when without the need to light source for detecting vibrating mirror deflection angle, detect the deflection angle of the vibrating mirror being used for horizontal scanning, when the frequency of operation of vibrating mirror is adjusted to its resonant frequency, prevent vibrating mirror from being destroyed owing to excessively driving, if do not reach the deflection angle of regulation, then can not from laser-projector projecting laser, laser-projector is made to keep safety, even if after starting projected image, also can detect for the deflection angle of each interFrameGap to vibrating mirror and correct, laser-projector can with stable deflection interval spans projected image,
3, laser-projector of the present invention can utilize self laser resource, is projected in picture by the laser cursor of cursor control unit generation, thus can remove laser pen from, and easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is laser-projector structural schematic block diagram of the present invention.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of new pattern laser projector of the present invention, comprising:
LASER Light Source, for Emission Lasers bundle;
Modulator, for carrying out the intensity of modulating lasering beam according to the image that will project;
Vibrating mirror, for the laser beam of horizontal deflection intensity ovennodulation;
Electromagnetic drive type scanning mirror, scans for making the laser from LASER Light Source;
Deflection angle detecting device, for detecting the deflection angle of described vibrating mirror;
Deflection angle adjuster, for the deflection angle based on the described vibrating mirror detected, adjusts the deflection angle of described vibrating mirror;
Back electromotive force detecting unit, for when laser-projector starts, detects the back electromotive force produced owing to driving electromagnetic drive type scanning mirror;
Control module, processes for the signal collected deflection angle detecting device and back electromotive force detecting unit, and controls the LASER Light Source of projector inside, vibrating mirror driver element, scanning mirror driver element and deflection angle adjuster;
Described signal input device is connected with control module, control module connects LASER Light Source, LASER Light Source by laser driver and connects modulator, vibrating mirror and scanning mirror successively, control module is connected with vibrating mirror by vibrating mirror driver element, control module connects scanning mirror by scanning mirror driver element, control module is also connected with modulator by video signal processing unit, is connected on vibrating mirror adjustment period of deflection angle detecting device and deflection angle.
Further, described control module comprises:
CPU, storage unit, and
Cursor control unit, for generate can movement in real time cursor signal and be sent to CPU;
Back electromotive force identifying unit, for judging whether the value of the back electromotive force detected by back electromotive force detecting unit exceedes default threshold value;
Frequency judging unit, for being judged to be by back electromotive force identifying unit whether number of times that the value of back electromotive force exceedes default threshold value is more than or equal to stipulated number and judges;
Light source control unit, for judging that at frequency judging unit the number of times that the value of back electromotive force is judged as the threshold value exceeding regulation is more than or equal to stipulated number, makes LASER Light Source start lighting;
The input of back electromotive force identifying unit is connected with back electromotive force detecting unit, connects CPU after the output number of pass times judging unit of back electromotive force identifying unit; The input of cursor control unit is connected with signal input device, and the output of cursor control unit connects CPU; The output of CPU is connected with cursor control unit, and the output of cursor control unit connects laser driver; The output of CPU connects deflection angle adjuster; CPU also links with storage unit.
Further, also collimating lens is provided with between described modulator and vibrating mirror; Also being provided with a changing unit in described control module, when for not being judged to be that described phase differential is in the scope of regulation by back electromotive force identifying unit at the appointed time, changing the drive condition of described electromagnetic drive type scanning mirror.
Further, described deflection angle detecting device comprises photodetector array, described photodetector array comprises the multiple photodetectors being parallel to horizontal scan direction arrangement, vibrating mirror makes laser beam deflect along horizontal scan direction, it is outside that photodetector array is configured in image projection district, and be configured in the wide region comprising laser beam horizontal scanning scope.The photodetector of described photodetector array does not arrange at equal intervals, and compared with photodetector array center, the photodetector in photodetector array is more intensive in the end of photodetector array.Photodetector array comprises transparency carrier and is configured in the semiconductor layer on transparency carrier.
Further, described deflection angle adjuster is for adjusting frequency and the intensity of the drive singal of vibrating mirror, deflection angle adjuster is consistent by the resonant frequency of the frequency with vibrating mirror that make the drive singal of vibrating mirror, then change the intensity of the drive singal of described vibrating mirror, adjust the deflection angle of described vibrating mirror.
Further, described cursor control unit comprises one group for controlling the Trackpad of cursor movement or controlling button, and one group for control cursor shape change control button, the acceptance division coupled with CPU and the remote control portion be coupled with this acceptance division, and this remote control portion is equiped with position transducer, this remote control portion detects change in location by position transducer and sends position variation signal to acceptance division.
The present invention makes to scan from the laser of LASER Light Source by electromagnetic drive type scanning mirror, when laser-projector starts, the back electromotive force produced owing to driving electromagnetic drive type scanning mirror is detected by back electromotive force detecting unit, and judge whether the value of the back electromotive force measured exceedes defined threshold, when being judged to be that the value of back electromotive force exceedes defined threshold, LASER Light Source is made to start lighting by light source control unit;
That is, when starting, in during the pivot angle of electromagnetic drive type scanning mirror does not reach enough sizes, LASER Light Source not lighting, just makes LASER Light Source start lighting after the pivot angle of electromagnetic drive type scanning mirror has reached enough sizes.Therefore, can avoid due to be in guarantee pivot angle not yet fully state under scanning mirror, cause the laser that sends from LASER Light Source to irradiate
In less scope, eliminate the danger that human body is damaged.Therefore, the security of laser-projector when starting can reliably be improved.
In addition, because whether electromagnetic drive type scanning mirror is driven with enough pivot angle sizes, whether exceed defined threshold according to the value of back electromotive force produced by this driving and carry out judging, so security when can guarantee startup by reliable and simple method.
According to the present invention, the photodetector array for the deflection angle of the vibrating mirror of measuring and adjustation horizontal scanning is configured to the horizontal scan direction being parallel to laser beam, and is configured in the scope wider than the deflection angle ranges of the laser beam that will adjust.According to the present invention, even if deflection angle is very little, laser-projector also when without the need to (except the LASER Light Source for showing image) when light source for detecting vibrating mirror deflection angle, can detect the deflection angle of the vibrating mirror being used for horizontal scanning.
When the frequency of operation of vibrating mirror is adjusted to its resonant frequency, prevent vibrating mirror from being destroyed owing to excessively driving.If do not reach the deflection angle of regulation, then can not from laser-projector projecting laser.Therefore, laser-projector is made to keep safety.
Except the photodetector array of the deflection angle for detecting vibrating mirror, an assembly (such as, transparency carrier) can also be manufactured on by the photodetector of the deflection angle of vertical scanning mirror during for detecting projected image with for the photodetector of the deflection angle of detection level scanning vibrating mirror.Can when without the need to increasing part count, vibrating mirror deflection angle and vertical scanning mirror deflection angle during detection projected image.When deflection angle can not remain in specialized range in abnormal cases, laser-projector keeps safety by cutting off laser beam immediately.
Even if after starting projected image, also can detect for the deflection angle of each interFrameGap to vibrating mirror and correct.Therefore, laser-projector can with stable deflection interval spans projected image.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (9)
1. a new pattern laser projector, is characterized in that, comprising:
LASER Light Source, for Emission Lasers bundle;
Modulator, for carrying out the intensity of modulating lasering beam according to the image that will project;
Vibrating mirror, for the laser beam of horizontal deflection intensity ovennodulation;
Electromagnetic drive type scanning mirror, scans for making the laser from LASER Light Source;
Deflection angle detecting device, for detecting the deflection angle of vibrating mirror;
Deflection angle adjuster, for the deflection angle based on the vibrating mirror detected, adjusts the deflection angle of described vibrating mirror;
Back electromotive force detecting unit, for when laser-projector starts, detects the back electromotive force produced owing to driving electromagnetic drive type scanning mirror;
Control module, processes for the signal collected deflection angle detecting device and back electromotive force detecting unit, and controls the LASER Light Source of projector inside, vibrating mirror driver element, scanning mirror driver element and deflection angle adjuster;
Described signal input device is connected with control module, control module connects LASER Light Source, LASER Light Source by laser driver and connects modulator, vibrating mirror and scanning mirror successively, control module is connected with vibrating mirror by vibrating mirror driver element, control module connects scanning mirror by scanning mirror driver element, control module is also connected with modulator by video signal processing unit, is connected on vibrating mirror adjustment period of deflection angle detecting device and deflection angle.
2. new pattern laser projector according to claim 1, is characterized in that, described control module comprises:
CPU, storage unit, and
Cursor control unit, for generate can movement in real time cursor signal and be sent to CPU;
Back electromotive force identifying unit, for judging whether the value of the back electromotive force detected by back electromotive force detecting unit exceedes default threshold value;
Frequency judging unit, for being judged to be by back electromotive force identifying unit whether number of times that the value of back electromotive force exceedes default threshold value is more than or equal to stipulated number and judges;
Light source control unit, for judging that at frequency judging unit the number of times that the value of back electromotive force is judged as the threshold value exceeding regulation is more than or equal to stipulated number, makes LASER Light Source start lighting;
The input of back electromotive force identifying unit is connected with back electromotive force detecting unit, connects CPU after the output number of pass times judging unit of back electromotive force identifying unit; The input of cursor control unit is connected with signal input device, and the output of cursor control unit connects CPU; The output of CPU is connected with cursor control unit, and the output of cursor control unit connects laser driver; The output of CPU connects deflection angle adjuster; CPU also links with storage unit.
3. new pattern laser projector according to claim 1, is characterized in that, is also provided with collimating lens between described modulator and vibrating mirror.
4. new pattern laser projector according to claim 1, it is characterized in that, a changing unit is also provided with in described control module, when for not being judged to be that described phase differential is in the scope of regulation by back electromotive force identifying unit at the appointed time, change the drive condition of described electromagnetic drive type scanning mirror.
5. new pattern laser projector according to claim 1, it is characterized in that, described deflection angle detecting device comprises photodetector array, described photodetector array comprises the multiple photodetectors being parallel to horizontal scan direction arrangement, vibrating mirror makes laser beam deflect along horizontal scan direction, it is outside that photodetector array is configured in image projection district, and be configured in the wide region comprising laser beam horizontal scanning scope.
6. new pattern laser projector according to claim 5, it is characterized in that, the photodetector of described photodetector array does not arrange at equal intervals, and compared with photodetector array center, the photodetector in photodetector array is more intensive in the end of photodetector array.
7. the new pattern laser projector according to claim 5 or 6, is characterized in that, described photodetector array comprises transparency carrier and is configured in the semiconductor layer on transparency carrier.
8. new pattern laser projector according to claim 1, it is characterized in that, described deflection angle adjuster is for adjusting frequency and the intensity of the drive singal of vibrating mirror, deflection angle adjuster is consistent by the resonant frequency of the frequency with vibrating mirror that make the drive singal of vibrating mirror, then change the intensity of the drive singal of described vibrating mirror, adjust the deflection angle of described vibrating mirror.
9. new pattern laser projector according to claim 2, it is characterized in that, described cursor control unit comprises one group for controlling the Trackpad of cursor movement or controlling button, and one group for control cursor shape change control button, the acceptance division coupled with CPU and the remote control portion be coupled with this acceptance division, and this remote control portion is equiped with position transducer, this remote control portion detects change in location by position transducer and sends position variation signal to acceptance division.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510600663.1A CN105182667A (en) | 2015-09-18 | 2015-09-18 | Novel laser projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510600663.1A CN105182667A (en) | 2015-09-18 | 2015-09-18 | Novel laser projector |
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| CN105182667A true CN105182667A (en) | 2015-12-23 |
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| CN201510600663.1A Pending CN105182667A (en) | 2015-09-18 | 2015-09-18 | Novel laser projector |
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Citations (7)
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|---|---|---|---|---|
| CN101517455A (en) * | 2006-09-15 | 2009-08-26 | 日本电气株式会社 | Laser projector |
| CN101561619A (en) * | 2008-04-16 | 2009-10-21 | 船井电机株式会社 | Laser projector |
| CN101860706A (en) * | 2009-04-01 | 2010-10-13 | 船井电机株式会社 | Image display device and method |
| CN101876778A (en) * | 2009-04-30 | 2010-11-03 | 船井电机株式会社 | Laser projection |
| CN203606820U (en) * | 2013-11-28 | 2014-05-21 | 骆展东 | Projector with capacitor touch tablet |
| CN203982346U (en) * | 2014-08-21 | 2014-12-03 | 吴建伟 | A kind of projection touching device |
| CN204925600U (en) * | 2015-09-18 | 2015-12-30 | 成都虹昇光电科技有限公司 | Novel laser projection appearance |
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2015
- 2015-09-18 CN CN201510600663.1A patent/CN105182667A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517455A (en) * | 2006-09-15 | 2009-08-26 | 日本电气株式会社 | Laser projector |
| CN101561619A (en) * | 2008-04-16 | 2009-10-21 | 船井电机株式会社 | Laser projector |
| CN101860706A (en) * | 2009-04-01 | 2010-10-13 | 船井电机株式会社 | Image display device and method |
| CN101876778A (en) * | 2009-04-30 | 2010-11-03 | 船井电机株式会社 | Laser projection |
| CN203606820U (en) * | 2013-11-28 | 2014-05-21 | 骆展东 | Projector with capacitor touch tablet |
| CN203982346U (en) * | 2014-08-21 | 2014-12-03 | 吴建伟 | A kind of projection touching device |
| CN204925600U (en) * | 2015-09-18 | 2015-12-30 | 成都虹昇光电科技有限公司 | Novel laser projection appearance |
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Application publication date: 20151223 |