CN201662680U - Projection system - Google Patents
Projection system Download PDFInfo
- Publication number
- CN201662680U CN201662680U CN2010201419698U CN201020141969U CN201662680U CN 201662680 U CN201662680 U CN 201662680U CN 2010201419698 U CN2010201419698 U CN 2010201419698U CN 201020141969 U CN201020141969 U CN 201020141969U CN 201662680 U CN201662680 U CN 201662680U
- Authority
- CN
- China
- Prior art keywords
- light source
- unit
- driving circuit
- laser
- projection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mechanical Optical Scanning Systems (AREA)
Abstract
The utility model discloses a projection system. The projection system comprises a light source unit, a light source drive circuit, a scanning unit, a scanning unit drive circuit, a detecting unit and a controller; the light source drive circuit comprises a power modulation unit used for modulating the power of laser generated by the light source unit; the scanning unit comprises a scanning lens used for reflecting the laser generated by the light source unit; the scanning unit drive circuit is used for driving the scanning lens to swing; the detecting unit is used for detecting the running state of the scanning lens of the scanning unit and generating a corresponding feedback signal; and the controller is used for controlling the light source drive circuit and the scanning unit drive circuit and receiving the feedback signal for judgment, so as to output the running state signal of the scanning unit to the power modulation unit. The projection system controls the laser output power through the power modulation unit and prevents the human eyes from being hurt by the output laser.
Description
Technical field
The utility model relates to a kind of shadow casting technique, relates in particular to a kind of optical projection system.
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.
The utility model content
The purpose of this utility model is to provide a kind of optical projection system of avoiding injuring human eye.
For achieving the above object, optical projection system that the utility model provides 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, gives the power modulation unit with the running status signal of output scan cell.
As mentioned above, the utility model optical projection system is regulated the height of laser output power by the power modulation unit, and then can 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 the utility model optical projection system;
Fig. 2 is the scan mirror work synoptic diagram of the utility model optical projection system;
The synoptic diagram of laser radiation on projecting lens of sending by scanning element when Fig. 3 works for the utility model optical projection system;
Fig. 4 is the process flow diagram of the projecting method of the utility model optical projection system;
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 utility model, 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, the utility model optical projection system 100 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 the utility model optical projection system 100 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 the utility model optical projection system 100 do next step relevant operation thus.
See also Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the projecting method of the utility model optical projection system 100 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 control 10 to;
(3) the above-mentioned feedback signal of controller 10 acceptance judges whether scan mirror 501 running statuses are normal, and sends signal to light source driving circuit 20 and power modulation unit 201 thereof;
(4) power modulation unit 201 is accepted signal and light source cell 40 is controlled.
See also Fig. 4 and Fig. 5, the projecting method of the utility model optical projection system 100 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 signal to light source driving circuit 20 and power modulation unit 201 thereof;
(4) power modulation unit 201 is accepted signal 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 signal to light source driving circuit 20 and power modulation unit 201 thereof;
(4) power modulation unit 201 is accepted signal and light source cell 40 is controlled, and continues to reduce laser power or close light source cell 40.
As mentioned above, the utility model optical projection system 100 is regulated the height of laser output power by power modulation unit 201, and then can 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 direct projection and go into human eye and cause injury to human eye when scanning element 40 is not normally moved.
Claims (3)
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 is 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, generate laser power in order to the regulation and control light source cell, controller is accepted above-mentioned feedback signal and is judged, gives the power modulation unit of light source driving circuit with the running status signal of output scan cell.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201419698U CN201662680U (en) | 2010-03-19 | 2010-03-19 | Projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201419698U CN201662680U (en) | 2010-03-19 | 2010-03-19 | Projection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201662680U true CN201662680U (en) | 2010-12-01 |
Family
ID=43233098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201419698U Expired - Fee Related CN201662680U (en) | 2010-03-19 | 2010-03-19 | Projection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201662680U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193286A (en) * | 2010-03-19 | 2011-09-21 | 富港电子（东莞）有限公司 | Projection system and projection method thereof |
| CN104914570A (en) * | 2014-03-10 | 2015-09-16 | 光宝科技股份有限公司 | Swing detection device and swing detection method for micro scanning mirror |
-
2010
- 2010-03-19 CN CN2010201419698U patent/CN201662680U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193286A (en) * | 2010-03-19 | 2011-09-21 | 富港电子（东莞）有限公司 | Projection system and projection method thereof |
| CN102193286B (en) * | 2010-03-19 | 2013-07-24 | 富港电子（东莞）有限公司 | Projection system and projection method thereof |
| CN104914570A (en) * | 2014-03-10 | 2015-09-16 | 光宝科技股份有限公司 | Swing detection device and swing detection method for micro scanning mirror |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102193286B (en) | Projection system and projection method thereof | |
| CN104204900A (en) | Scanning mirror and scanning image display device | |
| CN102566220B (en) | Projection device protective system and guard method | |
| CN103676425B (en) | Be applicable to the safety protecting method of laser projection device | |
| CN201662680U (en) | Projection system | |
| US11221412B2 (en) | Eye-safe laser triangulation measurement system | |
| CN103868675A (en) | Laser projector and laser beam scanning angle range detection method thereof | |
| CN112118431B (en) | Projection method and device | |
| CN105388693A (en) | Laser projector color automatic control system | |
| CN201662677U (en) | Projector | |
| KR20070032665A (en) | Improved image capture | |
| CN105025616B (en) | The method of optical navigation sensor and offer supply voltage to relevant source | |
| CN103596639A (en) | Automatic focusing projection system | |
| CN112631085A (en) | High-speed scanning exposure method of direct-writing type photoetching machine | |
| CN109738983B (en) | Light guide plate, display device, method and equipment for repairing white spots of display device | |
| CN207271528U (en) | A kind of defoaming device for slurry coating | |
| CN202067064U (en) | Projection device | |
| CN201689264U (en) | Projecting system | |
| TWI418915B (en) | Projection system and projection method thereof | |
| CN102236239A (en) | Projection system and detection method thereof | |
| CN109901185A (en) | Flight time component and electronic equipment | |
| CN104883521A (en) | Projection device and projection method thereof | |
| CN102375239A (en) | Projection system and method | |
| TW488147B (en) | Close loop control apparatus and method for a scanner | |
| CN110739889B (en) | Driving device of electromagnetic driving micro motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20140319 |