WO2018107783A1

WO2018107783A1 - Dust detection device and dust removal device for projection lens

Info

Publication number: WO2018107783A1
Application number: PCT/CN2017/096499
Authority: WO
Inventors: 罗振华; 梁明浩
Original assignee: 威创集团股份有限公司
Priority date: 2016-12-15
Filing date: 2017-08-08
Publication date: 2018-06-21
Also published as: CN106645196B; CN106645196A

Abstract

Disclosed are a dust detection device and a dust removal device for a projection lens (20). The dust detection device for the projection lens (20) comprises: a light-emitting component (11), a light intensity detector (12) and a micro-processor (13). The light-emitting component (11) and the light intensity detector (12) are respectively arranged at one side of the projection lens (20) by means of a support. The micro-processor (13) is connected to the light-emitting component (11) and the light intensity detector (12) respectively. The light-emitting component (11) transmits light to a lens (21) of the projection lens (20). The light intensity detector (12) detects the intensity of light reflected, after the lens (21) receives the light transmitted by the light-emitting component (11), by the lens (21), and sends the intensity of the light to the micro-processor (13). The micro-processor (13) detects whether the intensity of the light exceeds a pre-set light intensity threshold value, and when the intensity of the light exceeds the light intensity threshold value, outputs a detection result indicating that there is dust on the projection lens (20). The dust detection device effectively improves the efficiency of the detection of dust on the projection lens (20), and has a higher detection precision.

Description

Dust detecting device and dust removing device for projection lens

Technical field

The present invention relates to the field of data processing technologies, and in particular, to a dust detecting device and a dust removing device for a projection lens.

Background technique

The rear projection splicing display wall is a projection display product with extremely high requirements on the display picture quality. The rear projection splicing display wall includes a plurality of display units, and the display unit thereof can be referred to as shown in FIG. 1 , and mainly includes a box body, a projector, and a back. The projection machine includes a projection lens, and the projection lens projects the image data to the rear projection screen under the control of the relevant controller; the heat dissipation air passage includes an air inlet passage and an air outlet passage, and the heat dissipation wind of the projector The track (including the air inlet and outlet channels) is placed on the side of the projector. Due to the influence of factors such as the working environment of the rear projection splicing display wall, even if the cabinet of the projector is made dustproof, it is difficult to prevent dust from entering the inside of the display unit of the rear projection splicing display wall, if the dust falls on the lens of the projection lens of the projector The brightness and contrast of the display unit and the uniformity of the entire system are greatly affected, which seriously affects the display effect of the corresponding display unit. Therefore, it is extremely important for the detection of the dust on the projection lens of the display unit to display the display effect of each display unit of the rear projection splicing display wall.

In the process of detecting dust on the lens of the projection lens, it is necessary to adopt a periodic manual inspection scheme. During the inspection process, dust is found to take corresponding cleaning measures, and the detection workload is large, and the environment of each system is Differently, there are differences in the judgment standards in the inspection process of the corresponding inspectors, which affects the detection effect of dust on the projection lens.

Summary of the invention

Based on this, it is necessary to adopt a periodic manual inspection scheme in the process of detecting the dust of the projection lens, and the detection workload is large, and because the environment of each system is different, the judgment standard in the inspection process of the corresponding inspection personnel exists. A technical problem that affects the effect of dust detection, and provides a dust detecting device and a dust removing device for a projection lens.

A dust detecting device for a projection lens, comprising: a light emitting component, a light intensity detector and a microprocessor;

The light-emitting component and the light intensity detector are respectively disposed on one side of the projection lens through a bracket, and the microprocessor is respectively connected to the light-emitting component and the light intensity detector;

The light emitting component emits light to the lens of the projection lens, and the light intensity detector detects the light intensity of the light reflected by the lens after receiving the light emitted by the light emitting component, and sends the light intensity to the microprocessor; The microprocessor detects whether the light intensity exceeds a preset light intensity threshold, and outputs a detection result of dust in the projection lens when the light intensity exceeds a light intensity threshold.

The dust detecting device of the projection lens has a light-emitting component and a light intensity detector respectively disposed on a side of the projection lens through a bracket; and the light-emitting component emits light to the lens of the projection lens, so that the light intensity detector detects that the lens receives the light-emitting component After the emitted light, the light intensity of the corresponding reflected light enables the microprocessor to detect the dust of the projection lens according to the light intensity, thereby effectively improving the efficiency of dust detection on the projection lens, and the detection standard is independent of the artificial determination standard, and can be based on The working environment and related performance of the projection lens are set, so the corresponding dust detection has high accuracy.

A dust removing device for a projection lens, comprising: a dust detecting device including the above-mentioned projection lens, further comprising an air blowing passage and an air suction passage;

One end of the air blowing passage communicates with the air inlet passage, and the other end of the air blowing passage leads to the upper surface of the lens of the projection lens;

One end of the air suction channel is disposed on an upper side of the projection lens, and the other end of the air suction channel is connected to the air passage;

The air blowing passage introduces airflow in the air inlet passage into an upper surface of the lens of the projection lens, and the air suction passage introduces a flow of air passing through the upper surface of the lens into the air outlet passage.

The dust removing device of the projection lens can use the air blowing channel to introduce the airflow in the air inlet channel of the corresponding display unit into the upper surface of the lens of the projection lens, and then use the air suction channel to introduce the airflow passing through the upper surface of the lens into the corresponding display unit. The air passage discharges, so that the airflow passes through the upper surface of the lens of the projection lens, and the dust on the corresponding lens is removed, which can make the dust removal process more convenient and effectively improve the working efficiency in the dust removal process.

DRAWINGS

1 is a schematic structural view of a display unit of the prior art;

2 is a schematic structural view of a dust detecting device of a projection lens according to an embodiment;

3 is a schematic structural view of a dust detecting device of a projection lens according to an embodiment;

4 is a schematic structural view of a dust removing device of a projection lens of an embodiment;

Fig. 5 is a structural schematic view of a dust removing device of a projection lens of an embodiment.

detailed description

The specific embodiments of the dust detecting device and the dust removing device of the projection lens provided by the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a dust detecting device of a projection lens according to an embodiment, comprising: a light emitting component 11, a light intensity detector 12 and a microprocessor 13;

The light-emitting assembly 11 and the light intensity detector 12 are respectively disposed on the side of the projection lens 20 through a bracket, and the microprocessor 13 is respectively connected to the light-emitting assembly 11 and the light intensity detector 12;

The light-emitting component 11 emits light to the lens 21 of the projection lens 20, and the light intensity detector 12 detects the light intensity of the light reflected by the lens after the lens 21 receives the light emitted by the light-emitting component, and transmits the light intensity. To the microprocessor 13; the microprocessor 13 detects whether the light intensity exceeds a preset light intensity threshold, and outputs a detection result of dust in the projection lens when the light intensity exceeds the light intensity threshold.

The above-described light-emitting assembly 11 and light intensity detector 12 may be disposed on one side of the projection lens 20 through different brackets, so that the above-described light-emitting assembly 11 can emit light for detecting dust of the projection lens to the lens 21. The above-mentioned microprocessor 31 can be directly integrated on the projector control board, or can be disposed beside the light-emitting component 11 or the light intensity detector 12.

In the dust detecting device of the projection lens provided in this embodiment, the light-emitting component 11 and the light intensity detector 12 are respectively disposed on the projection lens 20 side through a bracket; and the light-emitting component 11 is used to emit light to the lens 21 of the projection lens 20, thereby The light intensity detector 12 detects the light intensity of the corresponding reflected light after the lens 21 receives the light emitted by the light-emitting component, so that the microprocessor 13 can vote according to the light intensity. The detection of dust on the lens 21 of the shadow lens 20 effectively improves the efficiency of dust detection on the projection lens, and the detection standard is independent of the artificial determination standard, and can be set according to the working environment and related performance of the projection lens, so that the corresponding dust detection has Higher accuracy.

In one embodiment, the above-described light-emitting assembly and light intensity detector may be disposed on one side of the projection lens through the same bracket.

In this embodiment, the light-emitting component and the light intensity detector are disposed through the same bracket. The material used in the above-mentioned light-emitting component and the light intensity detector and the space occupied can be effectively reduced, and the structure of the dust detecting device of the corresponding projection lens can be simplified.

As an embodiment, the microprocessor in the dust detecting device of the projection lens may also be disposed on the bracket on which the corresponding light-emitting component and the light intensity detector are disposed, and the light-emitting component, the light intensity detector and the microprocessor are integrated and configured. On the basis of ensuring the detection effect of the dust detecting device of the projection lens, the purpose of simplifying the structure can be achieved.

The dust detecting device of the projection lens of this embodiment can be referred to FIG. 3, wherein the position and direction of the light-emitting component and the light intensity detector can be fine-tuned. The lens detection point (the point at which the light emitted by the illumination assembly falls on the corresponding lens) is disposed in the middle of the lens between the center point and the edge. In order to ensure the reliability of the detection result, the illumination unit, the light intensity detector and the microprocessor are integrally arranged. The central axis of the detection module probe is ideally set in the direction that the normal angle of the lens detection point is 45° to 70° to the edge. Within a range (shaded range in Fig. 3), in general, the illuminating component and the light intensity detector may respectively include corresponding probes, and the distance between the probe and the lens may be set to 100 to 150 mm (mm).

In one embodiment, the above light intensity threshold can be determined as follows:

When there is no dust on the lens of the projection lens, the light emitting component emits light to the lens, and the light intensity detected by the light intensity detector is obtained to obtain a reference light intensity;

A light intensity threshold is set according to the reference light intensity.

As an embodiment, the above light intensity threshold may be set to be 50 to 80 times the reference light intensity.

In this embodiment, after the projection lens and the lens are cleaned to a dust-free state by manual cleaning or the like, the light-emitting component is used to emit light to the lens, and the light intensity detected by the light intensity detector is obtained to obtain a reference light intensity, and correspondingly set accordingly. The light intensity threshold. Setting the light intensity threshold to 50 of the reference light intensity Up to 80 times, the detection of dust on the lens can be accurately realized.

In one embodiment, the light intensity detector may include a light probe, the light intensity detector includes a light probe, the light probe is opposite to a middle range between the lens center point and the lens edge, and the light probe is detected. The range is from 45° to 70° of the normal of the detection point of the optical probe, and the distance between the optical probe and the lens is 100-150 mm. Wherein, the detection range includes a range of a direction of a central optical axis of the optical probe, and the detection point is a point at which a central optical axis of the optical probe falls on a mirror surface of the corresponding projection lens, and a normal line of the detection point is the detection point relative to the mirror surface Normal. The detection range is located between the normal line and the edge of the lens. If the corresponding detection range includes two boundaries, the boundary between the detection range and the normal line is 45°, and the other boundary of the detection range is The angle formed by the above normal is 70°.

The middle range is the intermediate range between the center point of the lens and the edge of the lens. If the shortest distance between the center point of the lens and the edge of the lens is D, the shortest distance from the center point of the lens in the middle range is four points of D. In one of the above, the other boundary of the middle range is a shortest distance from the edge of the lens of a quarter of D.

This embodiment can ensure the validity and smoothness of the detection work of the light intensity detector.

In one embodiment, the dust detecting device of the projection lens may further include an alarm, and the alarm is connected to the microprocessor, and the alarm receiving the microprocessor sends when the output projection lens has a detection result of dust. Alarm command and alarm according to the alarm command.

In this embodiment, the microprocessor is connected to the alarm device, and the microprocessor can detect that the corresponding light-emitting component and the light intensity detector are abnormal, or that a large amount of dust is present on the lens of the projection lens, and an alarm is required when manual cleaning or the like is required. . The alarm mode of the above alarm device may include various types, such as lighting, flashing, and/or whistling, etc.; various conditions detected by the microprocessor may respectively correspond to different alarm modes, for example, if the microprocessor detects the light intensity exceeds The intensity threshold can control the alarm to light the alarm when the output of the projection lens is dusty. If the microprocessor detects a large amount of dust on the lens of the projection lens (such as the intensity of the light detected by the microprocessor is much higher than the above) Light intensity threshold), you can control the alarm to make a whistle alarm to remind the corresponding staff to deal with it in time.

Referring to FIG. 4, FIG. 4 is a schematic structural view of a dust removing device of a projection lens according to an embodiment. The utility model comprises: a dust detecting device comprising the above projection lens, further comprising an air blowing passage 15 and an air suction passage 16;

One end of the air blowing passage 15 communicates with the air inlet passage 31 of the corresponding display unit, and the other end of the air blowing passage 15 leads to the upper surface of the lens 21 of the projection lens 20 to introduce the airflow in the air inlet passage 31 into the projection lens 20. The upper surface of the lens 21;

One end of the inhalation passage 16 is disposed on the upper side of the projection lens 20, and the other end of the inhalation passage 16 communicates with the outlet passage 32;

The air blowing passage 15 introduces the airflow in the air inlet passage 31 into the upper surface of the lens 21 of the projection lens 20, and the air suction passage 16 introduces a flow of air passing through the upper surface of the lens 21 into the air outlet passage 32.

The dust removing device of the projection lens provided in this embodiment can use the air blowing passage 15 to introduce the airflow in the air inlet passage 31 of the corresponding display unit into the upper surface of the lens 21 of the projection lens 20, and then use the air suction passage 16 to apply the lens 21 to the lens 21. The airflow passing through the surface is introduced into the air outlet passage 32 of the corresponding display unit for discharging, so that the airflow passes through the upper surface of the lens 21 of the projection lens 20, and the dust on the corresponding lens 21 is removed, so that the dust 21 cleaning process can be further eliminated. Convenience, effectively improving the efficiency of the dust removal process.

In one embodiment, the air blowing passage may be provided with a first access door, and the air suction passage may be provided with a second access door, and the first access door and the second access door may be respectively connected to the microprocessor, if the microprocessor detects When the corresponding light intensity exceeds the light intensity threshold, the first channel door and the second channel door may be separately controlled to open, so that the air blowing channel introduces the airflow in the air inlet channel of the display unit into the upper surface of the lens of the projection lens, and the upper surface of the lens The air flow is then introduced into the air outlet passage by the air suction passage to discharge the dust on the projection lens of the projection lens.

In one embodiment, the light-emitting component, the light intensity detector, and the air blowing channel are disposed adjacent to each other, that is, the light-emitting component, the light intensity detector, and the air blowing channel are disposed on a side of the projection lens adjacent to the air inlet channel of the display unit, As shown in FIG. 4, the light intensity detector 12 can be closely attached to the light-emitting assembly 11, and the light-emitting assembly 11 can be in close contact with the air blowing passage 15.

The dust removing device of the projection lens provided in this embodiment can also be referred to FIG. 5, and the detecting module including the light emitting component, the light intensity detector and the microprocessor, and the blowing channel are both disposed on the projection lens and close to the display unit. One side of the channel, and the light-emitting component, the light intensity detector and the air blowing channel are adjacently arranged, The airflow that blows the blowing channel to the lens introduces dust into the other side of the light-emitting component and the light intensity detector, thereby avoiding interference caused by the dust detecting work of the projection lens, and ensuring effective cleaning of the corresponding lens dust, ensuring The quality of the projection lens dust detection work.

In one embodiment, during the startup of the projector, the air blowing channel is opened, the airflow in the air inlet channel is introduced into the upper surface of the lens of the projection lens, and the air suction channel is opened to introduce the airflow passing through the upper surface of the lens. Describe the wind channel.

In this embodiment, the opening of the insufflation channel and the inspiratory channel can be achieved by opening the associated channel door provided in the insufflation channel and the inspiratory channel. During the startup of the projector, the air blowing channel and the air suction channel are opened, the airflow in the air inlet channel is introduced into the upper surface of the lens of the projection lens, and the airflow passing through the upper surface of the lens is introduced into the air outlet channel through the air suction channel. The dust on the upper surface of the lens is removed to ensure the projection display of the subsequent projection lens.

As an embodiment, when the air blowing channel and the air suction channel are opened, the opening time of the air blowing channel and the air suction channel are recorded, and when the opening time reaches a set time length, the opening air blowing channel and the suction are respectively closed. Air passage.

The above set duration can be set according to the boot time of the corresponding projector. In general, it can be set to any value within the range of 5 to 10 seconds. During the startup process of the projector, the blowing channel and the air outlet channel are set to be set for a long time, and then the dust on the upper surface of the lens is cleared to ensure the subsequent projection display effect, and the dust removal work can be avoided after the corresponding projector is turned on. The normal work interferes. The test data of the corresponding test shows that during the startup of the projector, the automatic cleaning of the projector lens by opening the air blowing channel and the air suction channel can generally extend the cycle interval of the manual cleaning by 2 to 3 times of the lens.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the inventive concept. These are all within the scope of protection of the present invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A dust detecting device for a projection lens, comprising: a light emitting component, a light intensity detector and a microprocessor;

The light-emitting component and the light intensity detector are respectively disposed on one side of the projection lens through a bracket, and the microprocessor is respectively connected to the light-emitting component and the light intensity detector;

The light emitting component emits light to the lens of the projection lens, and the light intensity detector detects the light intensity of the light reflected by the lens after receiving the light emitted by the light emitting component, and sends the light intensity to the microprocessor; The microprocessor detects whether the light intensity exceeds a preset light intensity threshold, and outputs a detection result of dust in the projection lens when the light intensity exceeds a light intensity threshold.
The dust detecting device for a projection lens according to claim 1, wherein the light-emitting assembly and the light intensity detector are disposed on one side of the projection lens through the same bracket.
The dust detecting device for a projection lens according to claim 1, wherein the light intensity threshold is determined as follows:

When there is no dust on the lens of the projection lens, the light emitting component emits light to the lens, and the light intensity detected by the light intensity detector is obtained to obtain a reference light intensity;

A light intensity threshold is set according to the reference light intensity.
The dust detecting device for a projection lens according to claim 3, wherein the light intensity threshold is set to be 50 to 80 times the reference light intensity.
The dust detecting device for a projection lens according to any one of claims 1 to 4, wherein the light intensity detector comprises a light probe facing a middle range between a center point of the lens and an edge of the lens The detection range of the optical probe is that the normal point of the detection point of the optical probe is in the range of 45° to 70° toward the edge of the lens, and the distance between the optical probe and the lens is 100 to 150 mm.
A dust detecting device for a projection lens according to any one of claims 1 to 4, further comprising an alarm, said alarm being connected to said microprocessor, said alarm receiving microprocessor outputting projection An alarm command sent when the lens has a detection result of dust, and an alarm is issued according to the alarm instruction.
A dust removing device for a projection lens, comprising: including claim 1