CN102193286B - Projection system and projection method thereof - Google Patents
Projection system and projection method thereof Download PDFInfo
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- CN102193286B CN102193286B CN 201010133068 CN201010133068A CN102193286B CN 102193286 B CN102193286 B CN 102193286B CN 201010133068 CN201010133068 CN 201010133068 CN 201010133068 A CN201010133068 A CN 201010133068A CN 102193286 B CN102193286 B CN 102193286B
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Abstract
The invention discloses a projection system and a projection method thereof. The projection system comprises a light source unit, a light source driving circuit, a scanning unit, a scanning unit driving circuit, a detecting unit and a controller, wherein the light source driving circuit is provided with a power modulating unit and the scanning unit is provided with a scanning lens. The projection method of the projection system comprises the following steps of: (1) starting the projection system, driving the light source unit by utilizing the light source driving circuit to generate low-power laser and driving the scanning unit by utilizing the scanning unit driving circuit; (2) detecting the running state of the scanning lens and generating a feedback signal by utilizing the detecting unit; (3) receiving the feedback signal and judging the running state of the scanning lens and sending the running state signal of the scanning unit to the light source driving circuit and the power modulating unit by utilizing the controller; and (4) receiving the running state signal of the scanning unit and controlling the light source unit by utilizing the power modulating unit. In the projection method of the projection system, provided by the invention, the laser output power is controlled through the power modulating unit so that the damage to human eyes, caused by the laser output by the projection system, can be prevented.
Description
Technical field
The present invention relates to a kind of shadow casting technique, relate in particular to a kind of optical projection system and projecting method thereof.
Background technology
Optical projection system has been widely used in the electronic products such as mobile phone, personal digital assistant, Portable projector.A kind of existing optical projection system comprises a controller, a light source driving circuit, one scan cell driving circuit, a light source cell, one scan unit and a detecting unit.Described scanning element has the scan mirror that can swing, detecting unit be used to detect scanning element scan mirror running status and generate corresponding feedback signal, the feedback signal of output is accepted by controller, controller control light source driving circuit and scanning element driving circuit.The projecting method of existing optical projection system is when optical projection system is in opening, scanning element driving circuit driven sweep eyeglass reciprocally swinging, being used to control the light source driving circuit of exporting corresponding image signal can generate and the high-power laser of output device the driving light source unit simultaneously, laser penetrates with scan mode by the swing of scan mirror, the running status of detecting unit detecting scan mirror also generates corresponding feedback signal, controller accepts also to judge this feedback signal, and then control light source driving circuit and scanning element driving circuit are done next step relevant operation.But the harm that the projecting method effective monitoring optical projection system of this optical projection system causes owing to the scanning element run-time error in projection process.
Yet, above-mentioned optical projection system is when just starting, because the laser power that light source cell generates is higher, can't normally swing as if scan mirror this moment, laser can not penetrate with scan mode by the swing of scan mirror, laser will pool pencil, if human eye is gone in this laser direct projection, easily human eye be caused serious injury.
Summary of the invention
The object of the present invention is to provide a kind of optical projection system and projecting method thereof of avoiding injuring human eye.
For achieving the above object, optical projection system provided by the present invention comprises a light source cell, one light source driving circuit, the one scan unit, the one scan cell driving circuit, one detecting unit and a controller, light source driving circuit generates laser in order to the driving light source unit, light source driving circuit has a power modulation unit, laser power in order to the generation of regulation and control light source cell, scanning element has the scan mirror that can swing, laser in order to the generation of reflection source unit, the scanning element driving circuit is in order to the swing of driven sweep eyeglass, detecting unit in order to the detecting scanning element scan mirror running status and generate corresponding feedback signal, controller control light source driving circuit and scanning element driving circuit also accepted above-mentioned feedback signal and judged, running status signal with output scan cell is given the power modulation unit, the power modulation unit is accepted the running status signal of scanning element and light source cell is controlled, when optical projection system starts, light source driving circuit driving light source unit generates lower powered laser, when the scan mirror running status just often, power modulation unit controls light source cell sends the laser of normal power, when the scan mirror running status was undesired, power modulation unit controls light source cell continued to reduce laser output power.
The projecting method of optical projection system of the present invention comprises the steps:
(1) start optical projection system, controller sends the driving signal to light source driving circuit and scanning element driving circuit respectively, and light source driving circuit driving light source unit generates lower powered laser, scanning element driving circuit driven sweep unit;
(2) running status of the scan mirror of detecting unit detecting scanning element and generate corresponding feedback signal and send controller to;
(3) controller is accepted above-mentioned feedback signal and is judged whether the scan mirror running status is normal, and sends the power modulation unit of the running status signal of scanning element to light source driving circuit;
(4) the power modulation unit is accepted the running status signal of scanning element and light source cell is controlled, when the scan mirror running status just often, power modulation unit controls light source cell sends the laser of normal power, when the scan mirror running status was undesired, power modulation unit controls light source cell continued to reduce laser output power.
As mentioned above, the projecting method of optical projection system of the present invention is regulated the height of laser output power by the power modulation unit, and then can make optical projection system when just starting, only export lower powered laser, the power modulation unit is controlled light source cell after definite scanning element running status again, can prevent to cross high-power laser direct projection and go into human eye and cause injury to human eye when scanning element is not normally moved.
Description of drawings
Fig. 1 is the theory diagram of optical projection system of the present invention;
Fig. 2 is the scan mirror work synoptic diagram of optical projection system of the present invention;
The synoptic diagram of laser radiation on projecting lens of sending by scanning element when Fig. 3 works for optical projection system of the present invention;
Fig. 4 is the process flow diagram of the projecting method of optical projection system of the present invention;
Fig. 5 is the process flow diagram of step shown in Figure 4 (4).
Each description of reference numerals is as follows among the figure:
Scan mirror 501 detecting units 60
Embodiment
By describing technology contents of the present invention, structural attitude in detail, realized purpose and effect, give explanation below in conjunction with embodiment and conjunction with figs. are detailed.
See also Fig. 1, optical projection system 100 of the present invention comprises a controller 10, a light source driving circuit 20, one scan cell driving circuit 30, a light source cell 40, one scan unit 50, a detecting unit 60 and a projecting lens 70.
See also Fig. 1, the controller 10 of optical projection system 100 of the present invention is in order to control light source driving circuit 20 and scanning element driving circuit 30.Described light source driving circuit 20 generates laser in order to driving light source unit 40, light source driving circuit 20 has a power modulation unit 201, laser power in order to 40 generations of regulation and control light source cell, scanning element driving circuit 30 is in order to driven sweep unit 50, detecting unit 60 is in order to the running status of detecting scanning element 50 and generate corresponding feedback signal, and the feedback signal of output is accepted by controller 10.
See also Fig. 2, described scanning element 50 has one and adopts MEMS (micro electro mechanical system) (MicroElectro Mechanical System, MEMS) the two-dimensional scan eyeglass 501 made of technology, described scan mirror 501 can be wound the axle and the axle swing that is parallel to paper perpendicular to paper simultaneously under the driving of scanning element driving circuit 30, the laser of light source cell 40 outputs can carry out image scanning through the reflection of scan mirror 501 on two dimensions thus, so complete image can be cast out.In addition, the scan mirror 501 of scanning element 50 is perpendicular to the axle of paper be parallel on the axle of paper back and forth during reciprocally swinging, respectively has two limit positions, so the laser of sending is formed with an irradiation area 80 when arriving projecting lens 70 after scanning element 50 scannings.
See also Fig. 2 and Fig. 3, described projecting lens 70 roughly in the form of sheets and have a projection imaging zone 701 that roughly is rectangle, described detecting unit 60 comprises sensor 601, sensor 601 is located on the projecting lens 70 and is positioned at outside the projection imaging zone 701.The length and width of described irradiation area 80 all is slightly larger than the projection imaging zone 701 of projecting lens 70.During scan mirror 601 swings, sensor 601 is accepted the laser of irradiation area 80 and is generated corresponding feedback signal, the feedback signal of output is accepted by controller 10, the signal of controller 10 judgements and output scanning eyeglass 501 running statuses is given the power modulation unit 201 of light source driving circuit 20, can make optical projection system 100 of the present invention do next step relevant operation thus.
See also Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the projecting method of optical projection system 100 of the present invention comprises the steps:
(1) start optical projection system 100, controller 10 sends the driving signal to light source driving circuit 20 and scanning element driving circuit 30 respectively, and light source driving circuit 20 driving light source unit 40 generate lower powered laser, scanning element driving circuit 30 driven sweep unit 50;
(2) running status of the scan mirror 501 of detecting unit 60 detecting scanning elements 50 and generate corresponding feedback signal and send controller 10 to;
(3) the above-mentioned feedback signal of controller 10 acceptance judges whether scan mirror 501 running statuses are normal, and sends the power modulation unit 201 of the running status signal of scanning element 50 to light source driving circuit 20;
(4) power modulation unit 201 is accepted the running status signal of scanning element 50 and light source cell 40 is controlled.
See also Fig. 4 and Fig. 5, the projecting method of optical projection system 100 of the present invention specifically comprises two kinds of situations, below provides respective embodiments.
Embodiment one, and its step is as follows:
(1) start optical projection system 100, controller 10 sends the driving signal to light source driving circuit 20 and scanning element driving circuit 30 respectively, and light source driving circuit 20 driving light source unit 40 generate lower powered laser, scanning element driving circuit 30 driven sweep unit 50; This moment, the scan mirror 501 of scanning element 50 was back and forth normally swung back and forth, and laser cooperates the synchronization action of scan mirror 501 to send with scan mode;
(2) sensor 601 is accepted the laser of irradiation area 80 and generates corresponding feedback signal to send controller 10 to;
(3) controller 10 is accepted above-mentioned feedback signal and is judged that scan mirror 501 running statuses are normal, sends the power modulation unit 201 of the running status signal of scanning element 50 to light source driving circuit 20;
(4) power modulation unit 201 is accepted the running status signal of scanning element 50 and is controlled the laser that light source cell 40 sends normal power.
Embodiment two, and its step is as follows:
(1) start optical projection system 100, controller 10 sends the driving signal to light source driving circuit 20 and scanning element driving circuit 30 respectively, and light source driving circuit 20 driving light source unit 40 generate lower powered laser, scanning element driving circuit 30 driven sweep unit 50; Scan mirror 501 undesired swings this moment, laser can't with scan mirror 501 synchronization actions, laser will penetrate and pool pencil in projecting lens 70, because the laser that light source cell 40 generates is lower powered, the laser direct projection is gone into human eye and can't human eye be damaged;
(2) sensor 601 can't accept normal laser and generates corresponding feedback signal and sends controller 10 to;
(3) controller 10 is accepted above-mentioned feedback signal and is judged that scan mirror 501 running statuses are undesired, sends the power modulation unit 201 of the running status signal of scanning element 50 to light source driving circuit 20;
(4) power modulation unit 201 is accepted the running status signal of scanning element 50 and light source cell 40 is controlled, and continues to reduce laser power or close light source cell 40.
As mentioned above, the projecting method of optical projection system 100 of the present invention is regulated the height of laser output power by power modulation unit 201, and then can make optical projection system 100 when just starting, only export lower powered laser, power modulation unit 201 is controlled light source cell after definite scanning element 40 running statuses again, can prevent to cross high-power laser and directly go into human eye and cause injury to human eye when scanning element 40 is not normally moved.
Claims (4)
1. optical projection system, comprise a light source cell, one light source driving circuit, the one scan unit, the one scan cell driving circuit, one detecting unit and a controller, light source cell is in order to generate laser, light source driving circuit generates laser in order to the driving light source unit, scanning element has the scan mirror that can swing, laser in order to the generation of reflection source unit, the scanning element driving circuit is in order to the swing of driven sweep eyeglass, detecting unit in order to the detecting scanning element scan mirror running status and generate corresponding feedback signal, controller control light source driving circuit and scanning element driving circuit, it is characterized in that: light source driving circuit has a power modulation unit, laser power in order to the generation of regulation and control light source cell, controller is accepted above-mentioned feedback signal and is judged, give the power modulation unit of light source driving circuit with the running status signal of output scan cell, the power modulation unit is accepted the running status signal of scanning element and light source cell is controlled, when optical projection system starts, light source driving circuit driving light source unit generates lower powered laser, when the scan mirror running status just often, power modulation unit controls light source cell sends the laser of normal power, when the scan mirror running status was undesired, power modulation unit controls light source cell continued to reduce laser output power.
2. optical projection system as claimed in claim 1 is characterized in that: also comprise a projecting lens, projecting lens has a projection imaging zone, and detecting unit comprises sensor, and sensor is positioned at outside the projection imaging zone.
3. optical projection system as claimed in claim 2 is characterized in that: described laser is formed with an irradiation area when arriving projecting lens after scanning element scanning is sent, and sensor is accepted the laser of irradiation area and generated described feedback signal.
4. as the projecting method of each described optical projection system of claim 1～3, it is characterized in that, may further comprise the steps:
(1) start optical projection system, controller sends the driving signal to light source driving circuit and scanning element driving circuit respectively, and light source driving circuit driving light source unit generates lower powered laser, scanning element driving circuit driven sweep unit;
(2) running status of the scan mirror of detecting unit detecting scanning element and generate corresponding feedback signal and send controller to;
(3) controller is accepted above-mentioned feedback signal and is judged whether the scan mirror running status is normal, and sends the power modulation unit of the running status signal of scanning element to light source driving circuit;
(4) the power modulation unit is accepted the running status signal of scanning element and light source cell is controlled, when the scan mirror running status just often, power modulation unit controls light source cell sends the laser of normal power, when the scan mirror running status was undesired, power modulation unit controls light source cell continued to reduce laser output power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133068 CN102193286B (en) | 2010-03-19 | 2010-03-19 | Projection system and projection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133068 CN102193286B (en) | 2010-03-19 | 2010-03-19 | Projection system and projection method thereof |
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| CN102193286A CN102193286A (en) | 2011-09-21 |
| CN102193286B true CN102193286B (en) | 2013-07-24 |
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| CN 201010133068 Expired - Fee Related CN102193286B (en) | 2010-03-19 | 2010-03-19 | Projection system and projection method thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676425B (en) * | 2012-09-04 | 2015-10-28 | 光宝科技股份有限公司 | Be applicable to the safety protecting method of laser projection device |
| CN104914570B (en) * | 2014-03-10 | 2017-06-13 | 光宝电子(广州)有限公司 | The swing arrangement for detecting and its swing method for detecting of micro scanning mirror |
| WO2019165952A1 (en) * | 2018-02-27 | 2019-09-06 | Oppo广东移动通信有限公司 | Control method and control device for laser projection module, and electronic device |
| CN110763433A (en) * | 2018-07-27 | 2020-02-07 | 成都理想境界科技有限公司 | Laser scanning projection device, equipment and detection method |
| CN110086083B (en) * | 2019-04-09 | 2020-11-03 | 苏州佳世达光电有限公司 | Power control circuit of projector |
| CN113296339A (en) * | 2020-02-24 | 2021-08-24 | 青岛海尔多媒体有限公司 | Method and device for protecting eyes of laser projection equipment and laser projection equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489382A (en) * | 2002-07-23 | 2004-04-14 | 日本电气视象技术株式会社 | Projecting apparatus |
| CN101331751A (en) * | 2005-12-13 | 2008-12-24 | 皇家飞利浦电子股份有限公司 | Device and method for laser safe operation |
| CN201662680U (en) * | 2010-03-19 | 2010-12-01 | 富港电子（东莞）有限公司 | Projection system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009134217A (en) * | 2007-12-03 | 2009-06-18 | Seiko Epson Corp | Projector |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489382A (en) * | 2002-07-23 | 2004-04-14 | 日本电气视象技术株式会社 | Projecting apparatus |
| CN101331751A (en) * | 2005-12-13 | 2008-12-24 | 皇家飞利浦电子股份有限公司 | Device and method for laser safe operation |
| CN201662680U (en) * | 2010-03-19 | 2010-12-01 | 富港电子（东莞）有限公司 | Projection system |
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