CN211979404U - Laser projector laser intensity abnormity protection device - Google Patents
Laser projector laser intensity abnormity protection device Download PDFInfo
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- CN211979404U CN211979404U CN202020443401.5U CN202020443401U CN211979404U CN 211979404 U CN211979404 U CN 211979404U CN 202020443401 U CN202020443401 U CN 202020443401U CN 211979404 U CN211979404 U CN 211979404U
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- 238000000576 coating method Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 7
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- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 206010005184 Blindness transient Diseases 0.000 description 1
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- 210000004556 brain Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Abstract
The utility model discloses a laser projector laser intensity abnormity protection device in the technical field of laser projectors, which comprises a laser in the laser projector; a mirror, a reflecting surface of the mirror being aligned with the beam emitted by the laser; the division board, the coating film face at the speculum is settled to the division board, illumination sensor has still been installed to one side that the division board is close to the speculum, can not need to come indirect intensity of judging the light beam through current intensity and pressure, but directly monitors the irradiation strength of laser, when effectively having avoided because the voltage of power is unstable, laser projector's power is not in time protected, when light beam intensity surpassed intensity, and the condition that leads to the harm eyes takes place, more directly monitors laser intensity, form last one the most direct protection.
Description
Technical Field
The utility model relates to a laser projector technical field especially relates to a laser projector laser intensity abnormity protection device.
Background
Laser projectors use a laser beam to transmit a picture. The optical components of the laser projector mainly comprise a red-green-blue three-color light valve, a beam combining X prism, a projection lens and a driving light valve. There are red, green and blue lasers in the laser projector.
Laser is expanded by a corresponding optical element and a processing chip in the machine and then is transmitted to an X prism to integrate the three beams of laser, and then the integrated laser is transmitted to a projection curtain by a projection objective to complete the display process of the whole laser projector; and the laser projector belongs to more mature equipment.
Laser light source projectors can be classified into laser light source liquid crystal projectors and laser light source DLP projectors according to optical imaging devices.
The optical engine of the laser light source liquid crystal projector mainly comprises a light splitting unit, a red, green and blue three-color liquid crystal plate, a beam combining X prism and a projection lens. White light emitted by the laser light source is divided into red, green and blue light by the light dividing unit; the red, green and blue light respectively transmits the three-color liquid crystal plate to form a red, green and blue three-color image, is mixed into a color image through the beam combining X prism, and is projected onto a projection screen through the projection lens.
The optical engine of the laser light source DLP projector mainly comprises a light splitting color wheel, a DMD unit and a projection lens. White light emitted by a laser light source is changed into alternate red, green, blue and yellow multicolor light through a light splitting color wheel; red, green, blue and yellow multicolor light alternately irradiates the DMD board, alternate red, green, blue and yellow multicolor images are reflected, the alternate red, green, blue and yellow multicolor images are projected onto a projection screen through a projection lens, and finally, the alternate red, green, blue and yellow multicolor images are synthesized into a color image in the brain and the sea after being observed by human eyes.
Laser light source projector belongs to more mature equipment.
The laser light source of the current laser light source projector uses a laser light emitting diode. The laser light emitting diode as a light source of the projector has the characteristics of high brightness, high efficiency, long service life and the like.
The laser beam has concentrated energy and high intensity, has certain danger, and the laser with different intensities can cause dazzling and transient blindness and even can cause permanent damage to the eyes and the skin of people in the field. There are strict international regulations on the safety and use of laser products. The Chinese national standard GB7247.1-2012 laser product safety corresponding to the international IEC60825-1 standard specifies the safety class (grade) of laser products, a measuring method and a labeling method. According to the output laser intensity, the following categories are classified:
3R type laser products: the notation "avoid direct illumination of the eye". Direct light can damage the eye.
3B laser product: the label "avoid beam illumination", direct light can damage the eyes and skin.
Therefore, different types of laser products have different requirements on use and installation places in order to avoid harm to human bodies. If the laser intensity suddenly rises to change to the high class in the case of low class product use, it may cause damage to the eyes or skin of the person present.
The long-focus laser light source projector above 4000lm is generally a laser product above 3R class.
The laser light source projector is provided with an overcurrent protection circuit on a power supply of a laser light source, so that the abnormal rise of power supply current is prevented, and the power of laser emitted by a laser light emitting diode is increased abnormally.
However, when the laser light source projector works, if a power supply circuit of the laser light source fails, the output current of the power supply is out of control, the output current is abnormally increased, and due to the out of control, an overcurrent protection circuit arranged in the circuit cannot limit excessive current output, so that the power of the laser light source power supply current is abnormally increased, the power of laser emitted by the laser light emitting diode is abnormally increased, and finally the projection light output of the laser light source projector exceeds the specification value of a product, for example, a 3R type laser product can be increased to a 3B type or a 4 type laser product in a short time, and the damage capability is increased.
Because the laser light emitting diode in the projector has a good heat dissipation environment, after an abnormality occurs, the laser light emitting diode can be burnt out due to excessive heat generated by overcurrent after several seconds or even ten and several seconds, and laser emission is stopped. Excessive light output during an abnormal to laser led burn out can cause damage to the body, and particularly the eyes, of the person being irradiated, which can be permanent damage.
Based on this, the utility model designs a laser projector laser intensity unusual protection device to solve above-mentioned problem.
Disclosure of Invention
An object of the utility model is to provide a laser projector laser intensity unusual protection device, can not need the electric current and the voltage through detecting laser power supply power to come indirect judgement laser intensity, but direct illumination intensity to laser light source monitors, effectively avoided because power supply circuit breaks down, power output current is out of control, output current risees unusually, laser projector's power is not in time protected, and lead to the harm to take place at the condition of field personnel eyes, more directly monitor laser intensity, form last one the most direct protection.
The utility model discloses a realize like this: a laser projector laser intensity abnormity protection device, a laser is arranged in the laser projector, the laser emits a light beam, comprising
The reflecting mirror is arranged on a path of a light beam emitted by the laser, and the part of the light beam passing through the reflecting mirror is transparent;
the isolation plate is arranged on the back surface of the reflector, and an illuminance sensor is arranged on the isolation plate and is arranged in a light-transmitting irradiation range;
the illumination sensor is electrically connected with the relay through the control unit, and the laser is electrically connected with the power supply through the relay.
Further, the control unit comprises a comparator, an amplifier and an adjustable reference voltage source, wherein the amplifier, the comparator and the adjustable reference voltage source are electrically connected with each other, the amplifier is electrically connected with the illuminance sensor, and the comparator is electrically connected with the relay.
Furthermore, a photosensitive element is arranged in the illumination sensor, and the projection area of the light transmission on the isolation plate is larger than the photosensitive area of the photosensitive element in the illumination sensor.
Further, the mirror completely covers the illumination projection of the light beam.
Further, the laser is a laser diode.
The utility model has the advantages that: the utility model discloses utilized the speculum that changes the light direction among laser projector's the optical system, because the speculum can't be with the whole reflection of light, have a small amount of transmissions to the transmissivity is the fixed value, this device has utilized this phenomenon, sets up light intensity sensor at the speculum back, detects the weak non-light tight intensity that sees through the speculum, and compares according to the transmission ratio, judges then whether the light intensity through the speculum reflection accords with the specification requirement.
The intensity of light that can ensure laser light source to jet out and get into the optical system rear end all is in the monitored state constantly, in case illumination intensity surpasss the default, the control unit of this device can discover at once that the voltage value of illuminance sensor output is not inconsistent with set for comparative voltage, and then makes the power supply of relay cutting laser instrument, extinguishes laser, ensures that the final output light of projector can not exceed standard, can not produce the injury to personnel's in the field eyes and skin.
The device is an independent monitoring circuit based on light intensity detection, is not influenced by other circuits of the laser projector, has high reliability, and can effectively implement protection in time. When a power supply circuit of the laser fails, a protection circuit of a power supply is out of control, the power supply current of the laser rises abnormally, the power of laser emitted by a laser source rises abnormally, and finally the projection light output of the laser projector exceeds the specification value of a product.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a projection of the light beam on the isolation plate according to the present invention;
fig. 3 is an internal schematic view of the control unit of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-illuminance sensor, 11-isolation board, 2-control unit, 21-comparator, 22-amplifier, 23-adjustable reference voltage source, 3-laser, 31-beam, 32-light transmission, 4-relay, 41-power supply, 5-reflector, 6-projection equipment and 61-optical system rear end.
Detailed Description
Referring to fig. 1 to 3, the present invention provides a technical solution: a laser projector laser intensity abnormity protection device, a laser 3 is arranged in the laser projector, the laser 3 emits a light beam 31, comprising
A mirror 5, said mirror 5 being arranged in the path of a light beam 31 emitted by the laser 3, the portion of said light beam 31 passing through the mirror 5 being transparent 32;
a partition plate 11, wherein the partition plate 11 is arranged on the back of the reflector 5, the partition plate 11 is provided with an illuminance sensor 1, and the illuminance sensor 1 is arranged in the irradiation range of the light transmission 32;
the illumination sensor 1 is electrically connected with the relay 4 through the control unit 2, the laser 3 is electrically connected with the power supply 41 through the relay 4, the intensity of the light beam 31 can be indirectly judged without current intensity and pressure, the irradiation intensity of the laser is directly monitored, and the situation that the eyes of field personnel are damaged due to the fact that the power supply 41 of the laser projector is not timely protected when the voltage or the current of the power supply 41 rises due to faults is effectively avoided, and when the intensity of the light beam 31 exceeds the intensity.
The control unit 2 comprises a comparator 21, an amplifier 22 and an adjustable reference voltage source 23, wherein the amplifier 22, the comparator 21 and the adjustable reference voltage source 23 are electrically connected with each other, the amplifier 22 is electrically connected with the illuminance sensor 1, the comparator 21 is electrically connected with the relay 4, and data monitoring is performed through the electrical elements to achieve the purpose of judging and calculating the intensity of the light beam 31 through data;
a photosensitive element is arranged in the illumination sensor 1, and the projection area of the light transmission 32 on the isolation plate 11 is larger than the photosensitive area of the photosensitive element in the illumination sensor 1, so that the condition of judgment error caused by incomplete photosensitive is avoided;
the reflector 5 completely covers the irradiation projection of the light beam 31, so that the light beam 31 is ensured not to be irradiated outside an allowable range, and electric elements which cannot bear illumination for a long time are prevented from being damaged;
the laser 3 is a laser diode, and belongs to a common laser 3, and the light output intensity of the laser 3 is in direct proportion to the current and the voltage output by the electric power supply 41.
In a specific embodiment of the present invention:
the laser projector faces the technical problems of safety: the protection circuit structure originally used for avoiding the damage of the eyes caused by the over-strong laser is to monitor the current and voltage changes output by the power supply 41 for the laser 3, and when the current and voltage exceed the preset specification values, the protection circuit acts to control the power supply to correct the current and voltage back to the specification range or close the power supply output. However, when the circuit of the laser power supply 41 fails and the output circuit is out of control, the current and voltage output to the laser 3 cannot be corrected back to the specification range by the protection circuit, which is equivalent to a protection failure. This is a potential safety hazard and not a safer practice, and once this is met it can cause injury to the eyes of the persons present and even irreparable results, a problem that is a potential safety hazard for laser projectors.
The adopted technical means is as follows: under the condition that the original protection circuit of the voltage and the current intensity of the power supply 41 is not removed, a safety circuit which cannot interfere with the power supply 41 for supplying power to the laser 3 is used, the circuit is used for carrying out final protection control on the power supply 41, and the circuit directly monitors the intensity of the light beam 31 emitted by the laser 3 through the illumination sensor 1, namely the protection of the protection device is judged according to the intensity of the light beam 31 emitted by the laser 3 in real time instead of the current intensity, so that the technical problem is more direct, namely the technical problem before the occurrence is solved, and no matter how current is, as long as the intensity of the light beam 31 exceeds the range set by the comparator 2, the power of the laser 3 is cut off through the power of the relay 4, so that the power of the laser 3 is controlled to be cut off;
the technical means is that the principle of the light transmittance of the laser and the reflector 5 is followed, the reflector 5 used in the laser projector has good light reflection performance, and the light transmittance of the light transmittance is generally 0.1% -1%, so that the illumination sensor 1 is directly arranged behind the reflector 5, a complex and zigzag reflection line of the light beam 31 in the laser projector is not blocked and influenced, and the illumination sensor 1 is prevented from being damaged by high temperature generated by high-intensity illumination of the light beam 31 directly, the manufacturing process of the reflector 5 determines the light transmittance data of the reflector, the light transmittance is a fixed value, the intensity of the transmitted light 32 is in direct proportion to the intensity of the light beam 31, and the device utilizes the principle to monitor the intensity of the transmitted light 32 and equivalently monitor the intensity of the light beam 31. The principle of the device is that the control of the relay 4 is formed by establishing a fixed light transmittance value of the reflector 5 and an electric signal generated by the illumination sensor 1 according to illumination and comparing the electric signal by the comparator 2;
the laser projector is monitored more directly and safely, the intensity of the light beam 31 emitted by the laser 3 is monitored in real time, and the technical effect that the intensity of the light beam 31 cannot exceed the safety range is ensured, and the method specifically comprises the following steps:
the embodiment of the utility model provides a through providing a laser projector laser intensity abnormal protection device, the utility model discloses the technological effect who realizes does: 1. an independent protection device irrelevant to the original protection device is added, the laser can work under the condition that the original protection circuit of the power supply 4 fails, the safety coefficient is increased, and the intensity of the light beam 31 finally emitted by the laser 3 is ensured not to exceed the set intensity;
2. the current and the voltage of the power supply 41 do not need to be monitored, the fluctuation interference of the power supply 41 is avoided, and the accuracy is higher;
3. the projection light beam 31 of the laser 3 working normally is not blocked, the light intensity of the light beam 31 working normally is not reduced or enhanced, and the light intensity of the light beam 31 can be monitored in real time;
4. the last protective measure originally is that laser diode luminous intensity of laser instrument 3 is too high, leads to generating heat excessively then to damage to carry out the power-off protection, do not have the time of waiting for the laser diode damage now, the time of can no longer appearing waiting for the laser diode damage causes the condition emergence of injury to people.
The embodiment of the utility model provides an in technical scheme for solving above-mentioned problem, the general thinking is as follows:
for better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.
The utility model discloses when using, increase an illuminance sensor 1 through the back of speculum 5 in laser projector, ensure that the light beam 31 that laser source 6 sent then appears white light beam 31 through fluorophor and mixed light unit, the fast transmission speculum 5 of light, printing opacity 32 just in time shines on illuminance sensor 1, and most white light beam 31 is formed the reverberation by speculum 5 turn to the reflection and is used for normal projection work simultaneously.
The illuminance sensor 1 is mounted on the rear surface of the mirror 5, and the rear surface of the mirror 5 is not irradiated with the light beam 31. The light 32 penetrating the reflector 5 irradiates the illumination sensor 1, the output voltage V1 of the illumination sensor is in direct proportion to the intensity of the irradiated light, and the V1 signal is amplified to V2 by the amplifier 22 in the control unit 2; v3 is the corresponding light intensity upper limit preset in the adjustable reference voltage source 23; v2 and V3 are respectively input to both ends of the comparator 21 in the control unit.
When the intensity of the irradiated light is lower than the upper limit value, that is, the voltage value of V2 is lower than V3, the comparator 21 outputs the driving current I to pull the relay 4, the power supply 41 of the laser 3 supplies power to the laser light source 6, and the laser light source 6 emits laser light.
When the intensity of the irradiated light reaches or exceeds the upper limit value, that is, the voltage value of V2 is higher than V3, the comparator 21 stops outputting the driving current I to disconnect the relay 4, the power supply 41 of the laser 3 and the laser light source 6 are disconnected, and the laser is extinguished, thereby playing a role in protection.
This working step utilizes these electrical components solitary principles in order to express this application, makes up an order and arranges, has reached monitoring beam 31 intensity and has carried out the effect of the protection that exceeds standard, constitutes the utility model discloses a protection step has accomplished this device and has surpassed the scope at laser 3's intensity, and relay 4 carries out power-off protection's purpose.
The power supply 41 supplies power to the laser 3, the power supply 41 is the power supply 41 in the laser projector, and the output current is controlled by the main control chip of the projector, but the relay 4 of the device can directly cut off the electrical connection between the laser 3 and the power supply 41, so that the laser 3 can be completely powered off and stop working when the intensity of the light beam 31 exceeds the preset upper limit value.
The illuminance sensor 1 is a device that converts an optical signal into an electrical signal based on the photoelectric effect. The core of the illuminance sensor 1 is a photodiode made of a semiconductor material.
The laser 3 is a semiconductor laser light source, i.e. a laser diode, of the type commonly used in laser projectors.
The reflecting mirror 5 is usually a surface mirror, and the surface coated with a reflecting film is a reflecting surface, but the reflecting surface cannot reflect all light, and there is generally a small amount of light transmission 32, in this embodiment, the reflecting mirror 5 has a reflectivity greater than 95%, a light transmission of about 0.1% to 1%, and losses such as partial scattering or heat generation, so the illuminance sensor 1 installed on the back of the reflecting mirror 5 can sense weak transmitted illumination, and such an arrangement can not block normal light beam 31 irradiation, but also can directly sense light intensity, and perform intensity judgment and monitoring. The light transmittance of the light-transmitting mirror 5 is determined by the coating material and thickness, and is substantially constant, so that the transmitted light is proportional to the intensity of the incident light.
The shapes of the light beam 31 and the light transmission 32 emitted from the laser 3 of the present apparatus are not limited to the characteristic shapes, and the actual situation in which the laser 3 emits laser light is taken as the standard.
The inner structure of projector has various different design, and above-mentioned explanation is based on installing illuminance sensor behind the speculum of white light path, the utility model discloses when concrete implementation, do not restrict and install behind the speculum of white light path, can be according to actual need, the selection is installed at laser light path, or behind the speculum of red green blue tristimulus in the beam splitting unit, so this device is not limited to the position of following laser 3 and jets out laser to the explanation of speculum 5 position, can also be at the rear end of light beam 31, and the speculum 5 rear side that the light beam 31 of any colour mixed light unit or fluorophor rear end jetted out can all install this device additional, does not restrict specific position, only need in light beam 31 route can.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (5)
1. A laser projector laser intensity abnormity protection device, a laser (3) is arranged in the laser projector, the laser (3) emits a light beam (31), and the protection device is characterized in that: comprises that
A mirror (5), the mirror (5) being arranged in the path of a light beam (31) emitted by the laser (3), the portion of the light beam (31) passing through the mirror (5) being transparent (32);
the isolation plate (11), the isolation plate (11) is arranged on the back of the reflector (5), the isolation plate (11) is provided with an illuminance sensor (1), and the illuminance sensor (1) is arranged in the irradiation range of the light transmission (32);
the illumination sensor comprises a control unit (2) and a relay (4), wherein the illumination sensor (1) is electrically connected with the relay (4) through the control unit (2), and the laser (3) is electrically connected with a power supply (41) through the relay (4).
2. The laser intensity abnormality protection device for the laser projector according to claim 1, characterized in that: the control unit (2) comprises a comparator (21), an amplifier (22) and an adjustable reference voltage source (23), wherein the amplifier (22), the comparator (21) and the adjustable reference voltage source (23) are electrically connected with each other, the amplifier (22) is electrically connected with the illuminance sensor (1), and the comparator (21) is electrically connected with the relay (4).
3. The laser intensity abnormality protection device for the laser projector according to claim 2, characterized in that: photosensitive elements are arranged in the illuminance sensor (1), and the projection area of the light transmission part (32) on the isolation plate (11) is larger than the photosensitive area of the photosensitive elements in the illuminance sensor (1).
4. The laser intensity abnormality protection device for the laser projector according to claim 1, characterized in that: the mirror (5) completely covers the illumination projection of the light beam (31).
5. The laser intensity abnormality protection device for the laser projector according to claim 1, characterized in that: the laser (3) is a laser diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020443401.5U CN211979404U (en) | 2020-03-31 | 2020-03-31 | Laser projector laser intensity abnormity protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020443401.5U CN211979404U (en) | 2020-03-31 | 2020-03-31 | Laser projector laser intensity abnormity protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211979404U true CN211979404U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020443401.5U Expired - Fee Related CN211979404U (en) | 2020-03-31 | 2020-03-31 | Laser projector laser intensity abnormity protection device |
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| Country | Link |
|---|---|
| CN (1) | CN211979404U (en) |
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2020
- 2020-03-31 CN CN202020443401.5U patent/CN211979404U/en not_active Expired - Fee Related
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Granted publication date: 20201120 |