CN107976734B - spectrum neutral light filtering device - Google Patents
spectrum neutral light filtering device Download PDFInfo
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- CN107976734B CN107976734B CN201711248737.5A CN201711248737A CN107976734B CN 107976734 B CN107976734 B CN 107976734B CN 201711248737 A CN201711248737 A CN 201711248737A CN 107976734 B CN107976734 B CN 107976734B
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- filter set
- filter
- fixed block
- transmittance
- angle
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/205—Neutral density filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
Abstract
The invention provides a spectral neutral filtering device, which comprises: a left filter set and a right filter set; the included angle between the transmission surface of the left filter set and the horizontal direction is an acute angle, the included angle between the transmission surface of the right filter set and the horizontal direction of the light incidence direction is a negative angle, and the size of the negative angle is the same as that of the acute angle; the left filter set and the right filter set are formed by sequentially stacking a plurality of high-purity quartz filters with the same number. The spectral neutral filtering device provided by the invention can generate specific transmittance to light; the spectrum neutral filtering device can be used for calibrating the transmittance of a visible wave band and the transmittance of an ultraviolet wave band, and the calibration range of the spectrum neutral filtering device is expanded.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a spectral neutral filtering device.
Background
The calibration of the existing spectrometer for measuring the optical characteristics of materials, particularly the calibration of instruments represented by a spectrophotometer, relates to the fields of medical health, external trade and the like, and the calibration of related instruments is strict. The state has specially provided the verification procedures of such instruments, for example, JJG 178-.
At present, the existing transmittance calibration of the visible band needs to be performed by using a spectral neutral filtering device of the visible band, for example, a filter is formed by splicing two wedge-shaped filters, and the wedge surfaces of the two wedge-shaped filters are opposite and are coated with films. During calibration, incident light sequentially passes through the two surfaces of the wedge-shaped optical filter, when the incident light reaches the second wedge surface, the incident light is decomposed into reflected light and emergent light, and because the optical filter is wedge-shaped, a large amount of reflected light deviates from the original light path direction, so that the influence on calibration is avoided.
However, the spectral neutral-filtering device in the visible band is made of glass materials, and absorbers with different concentrations are added into the glass materials. In addition, the absorbers generally cannot transmit ultraviolet light, so that the transmittance of an ultraviolet band is calibrated by adopting a single ultraviolet spectrum neutral filtering device. Although the ultraviolet spectrum neutral filtering device can also transmit visible light, the ultraviolet spectrum neutral filtering device is manufactured by adopting a coating process, and the stability of the ultraviolet spectrum neutral filtering device is poor, so that the ultraviolet spectrum neutral filtering device cannot be used for calibrating the transmittance of a visible waveband.
disclosure of Invention
In view of the above technical problems, the present invention provides a spectral neutral filtering apparatus.
In a first aspect, the present invention provides a spectrally neutral filtering arrangement comprising: a left filter set and a right filter set; an included angle between the transmission surface of the left filter set and the horizontal direction is an acute angle, an included angle between the transmission surface of the right filter set and the horizontal direction is a negative angle, and the size of the negative angle is the same as that of the acute angle; the left filter set and the right filter set are formed by sequentially stacking a plurality of high-purity quartz filters with the same number.
Wherein, the substrate of high-purity quartz filter is the quartz glass piece, just the thickness of quartz glass piece is 10um to 50 um.
Wherein, the spectrum neutral filtering device further comprises: the fixed bolster, the fixed bolster has the curb plate that sets up around the fixed bolster bottom, the bottom of left side filter group and the bottom of right side filter group with the bottom contact of fixed bolster, just the left side of the lower extreme of left side filter group with the left side limit contact of curb plate, the right side limit of the lower extreme of right side filter group with the right side limit contact of curb plate.
Wherein, the spectrum neutral filtering device further comprises: the first fixing block, the second fixing block and the third fixing block are sequentially and vertically arranged on the upper part of the fixing support; the upper end of the left filter set extends into a gap between the first fixed block and the second fixed block, and two side edges of the upper end of the left filter set are respectively contacted with the first fixed block and the second fixed block; and the upper end of the right filter set extends into a gap between the second fixed block and the third fixed block, and two side edges of the upper end of the right filter set are respectively contacted with the second fixed block and the third fixed block.
Wherein, the spectrum neutral filtering device further comprises: the fourth fixed block is transversely arranged at the bottom of the fixed support and is transversely arranged in a gap between the lower end of the left filter set and the lower end of the right filter set; and the left side of the fourth fixed block contacts with the right side of the left side optical filter set, and the right side of the fourth fixed block contacts with the left side of the right side optical filter set.
The included angle between the left side filter set and the horizontal direction is 5 degrees to 15 degrees, and the included angle between the right side filter set and the horizontal direction is-5 degrees to-15 degrees.
the number of the high-purity quartz optical filters of the left optical filter group and the right optical filter group is 8.
The number of the high-purity quartz optical filters of the left optical filter group and the right optical filter group is 10.
The number of the high-purity quartz optical filters of the left optical filter group and the right optical filter group is 15.
According to the spectrum neutral filtering device provided by the invention, the left filter set and the right filter set are formed by stacking a plurality of high-purity quartz filters respectively, so that the spectrum neutral filtering device generates a specific transmittance to light; and the left side filter set and the right side filter set both adopt high-purity quartz filters, and the transmittance of the high-purity quartz filters to an ultraviolet band, a visible band and a near infrared band is high and stable, so that the high-spectrum neutral filter device can be used for calibrating the transmittance of the visible band and the transmittance of the ultraviolet band, and the calibration range of the spectrum neutral filter device is expanded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a spectrally neutral filtering arrangement provided by an embodiment of the present invention;
FIG. 2 is a graph of transmittance of a high purity quartz filter in the spectral neutral density filter of FIG. 1;
FIG. 3 is a graph showing a relationship between a transmittance of the high purity quartz filter shown in FIG. 1 and the number of the high purity quartz filters;
Wherein, 1-incident ray; 2-reflecting the light; 3-a first fixed block; 4-a second fixed block; 5-a third fixed block; 6-a fourth fixed block; 7-left filter set; 8-right filter set.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a spectral neutral density filter according to an embodiment of the present invention, and as shown in fig. 1, the spectral neutral density filter includes: left filter set 7 and right filter set 8; an included angle between the transmission surface of the left filter set 7 and the horizontal direction is an acute angle, an included angle between the transmission surface of the right filter set 8 and the horizontal direction is a negative angle, and the size of the negative angle is the same as that of the acute angle; the left filter set 7 and the right filter set 8 are formed by sequentially stacking a plurality of quartz filters with the same number.
The quartz filter has good light transmission performance in the whole spectrum wave band from ultraviolet to infrared, the visible light transmittance is more than 93%, and particularly, the maximum transmittance can reach more than 80% in the ultraviolet spectrum region.
In particular, when a specific transmittance for light is required, it can be formulated according to the formulaWhere τ is the desired transmittance, τ1Is the transmittance of the first filter, τ2Is the transmittance of the second filter, p1Is the reflectance of the first filter, p2calculating the number of the required high-purity quartz filters for the reflectance of the second filter; and the like when a plurality of sheets are overlapped. Then, the required quartz filters are stacked in two groups in order to form left filter set 7 and right filter set 8. For example, if the transmittance to light is required to be 0.7, it can be calculated that the number of required quartz filters is 4, and the left filter group 7 and the right filter group 8 each have 2 high-purity quartz filters.
During calibration, for example, incident light 1 horizontally enters from the left side, then incident light 1 first irradiates on the transmission surface of left filter set 7, and because the transmission surface of left filter set 7 and the light incidence direction are arranged at a certain included angle, then reflected light 2 is emitted to the other side, so that the problem that the measured transmission ratio is higher due to light returning along the original path is effectively avoided. Because the included angle between the transmission surface of the left filter set 7 and the incident direction of the light ray is an acute angle, the incident light ray 1 slightly shifts upwards and deviates from the original incident position. Because the included angle between the transmission surface of the right filter set 8 and the transmission surface of the left filter set 7 and the incident direction of the light is a positive acute angle and a negative acute angle with the same size, that is, the right filter set 8 and the left filter set 7 are symmetrically arranged, after the light passes through the transmission surface of the right filter set 8, the light can reversely translate downwards and return to the original incident straight line.
In the embodiment of the invention, the left filter set and the right filter set are formed by stacking a plurality of high-purity quartz filters respectively, so that the spectral neutral filter device generates a specific transmittance to light; meanwhile, the transmittance of the high-purity quartz optical filter to the ultraviolet band, the visible band and the near-infrared band is high and stable, so that the spectral neutral optical filter device can be used for calibrating the transmittance of the visible band and the transmittance of the ultraviolet band, and the calibration range of the spectral neutral optical filter device is expanded. And the right filter set and the left filter set are obliquely arranged, so that the influence of calibration of reflected light and transmittance is avoided, and the calibration accuracy of the spectrum neutral filter device on the spectrometer is improved.
on the basis of the embodiment, the substrate of the high-purity quartz filter is a quartz glass sheet, and the thickness of the quartz glass sheet is 10um to 50 um.
Among them, the silica glass sheet is generally colorless and transparent, and the silica glass can be classified into two types, i.e., fused silica glass and synthetic silica glass, in a wide production range. The heat resistance, light transmittance, electrical insulation and chemical stability are all extremely excellent. The optical performance of the quartz glass sheet has the unique point, and the quartz glass sheet can not only transmit far ultraviolet bands which are the best of all ultraviolet-transmitting bands, but also transmit visible light bands and near infrared bands.
Specifically, the quartz glass sheet has extremely high transmittance to ultraviolet light, visible light and near infrared light due to extremely stable transmittance, namely extremely high transmittance to light with a wavelength range of 250nm-2500 nm; and the transmittance is approximately a constant of 92%; since the quartz glass plate hardly absorbs light energy, the reflectance was 8%. The transmittance of the high-purity optical filter adopting the quartz glass sheet as the substrate is shown in figure 2, so that the transmittance of the quartz glass sheet is not changed along with the wavelength by adopting the quartz glass sheet as the substrate of the high-purity quartz optical filter, and the stability and the consistency of the transmittance of the quartz optical filter can be improved.
And the thickness of the quartz glass sheet is set to be 10um to 50um, then the left filter set 7 and the right filter set 8 are formed by stacking a plurality of quartz glass sheets with the same thickness, and further a filter device generating a specific transmittance for light is formed. For example, the thickness of the quartz glass sheet is set to 50um, 45um, 30um, 10um, etc., for example, when the thickness of the quartz glass sheet is set to 30um, then left filter set 7 and right filter set 8 are each stacked by the same number of quartz glass sheets having a thickness of 30 um.
In the embodiment of the invention, the high-purity quartz glass sheet is adopted as the substrate of the quartz optical filter, so that the transmission ratio of the spectral neutral optical filter device is high and stable, and the transmission ratio of the spectral neutral optical filter device is not changed along with the wavelength, the stability and the consistency of the spectral neutral optical filter device are improved, and the requirement of a verification regulation is met.
On the basis of the above embodiments, the spectral neutral density filtering apparatus further includes: the fixed bolster, the fixed bolster has the curb plate that sets up around the fixed bolster bottom, the bottom of left side filter group 7 and the bottom of right side filter group 8 with the bottom contact of fixed bolster, just the left side of the lower extreme of left side filter group 7 with the left side limit contact of curb plate, the right side limit of the lower extreme of right side filter group 8 with the right side limit contact of curb plate.
Specifically, the spectral neutral filtering device is provided with a fixed support, and the bottom of the left filter set 7 and the bottom of the right filter set 8 are both arranged at the bottom of the fixed support; the left side edge of the lower end of the left filter set 7 is in contact with the left side edge of the side plate of the fixed support, namely, the left filter set 7 is arranged close to the left side edge of the side plate, so that the left filter set 7 can be stably and obliquely arranged; and, the right side of the lower extreme of right side filter group 8 contacts with the right side of this fixed bolster's curb plate, namely, right side filter group 8 leans on the right side of establishing at the curb plate to make right side filter group 8 can more firm slope put, thereby improve this spectrum neutral filter device's stability.
On the basis of the above embodiments, the spectral neutral density filtering apparatus further includes: the first fixing block 3, the second fixing block 4 and the third fixing block 5 are sequentially and vertically arranged on the upper part of the fixing support; the upper end of the left filter set 7 extends into a gap between the first fixed block 3 and the second fixed block 4, and two side edges of the upper end of the left filter set 7 are respectively contacted with the first fixed block 3 and the second fixed block 4; and the upper end of the right filter set 8 extends into a gap between the second fixed block 4 and the third fixed block 5, and two side edges of the upper end of the right filter set 8 are respectively contacted with the second fixed block 4 and the third fixed block 5.
Specifically, vertically set up first fixed block 3, second fixed block 4 and third fixed block 5 in the upper portion of fixed bolster, and stretch into the upper end of left side filter group 7 in the clearance between first fixed block 3 and second fixed block 4, promptly, the clearance between first fixed block 3 and the second fixed block 4 just can be with the fixed position of the upper end of the left side filter group 7 that the slope set up. And when the number of the high-purity quartz filters of the left filter set 7 changes according to the requirement of the transmittance, the gap between the first fixing block 3 and the second fixing block 4 also needs to be correspondingly adjusted so as to stably fix the upper end of the left filter set 7 between the first fixing block 3 and the second fixing block 4.
And the upper end of the right filter set 8 is inserted into the gap between the second fixed block 4 and the third fixed block 5, that is, the gap between the second fixed block 4 and the third fixed block 5 can just fix the position of the upper end of the obliquely arranged right filter set 8. When the number of the high-purity quartz filters of the right filter set 8 changes according to the requirement of the transmittance, the gap between the second fixing block 4 and the third fixing block 5 needs to be correspondingly adjusted, so that the upper end of the right filter set 8 is stably fixed between the second fixing block 4 and the third fixing block 5.
In the embodiment of the invention, the positions of the upper ends of the left filter set and the right filter set are fixed through the first fixing block, the second fixing block and the third fixing block, so that the situation that the filters of the left filter set and the right filter set move relatively in the calibration process is avoided, the stability of the spectral neutral filter device is improved, and the calibration accuracy of the spectral neutral filter device is further improved.
On the basis of the above embodiments, the spectral neutral density filtering apparatus further includes: the fourth fixing block 6 is transversely arranged at the bottom of the fixing support, and the fourth fixing block 6 is transversely arranged in a gap between the lower end of the left filter set 7 and the lower end of the right filter set 8; and the left side of fourth fixed block 6 with the right side contact of left side filter set 7, the right side of fourth fixed block 6 with the left side contact of right side filter set 8.
Specifically, transversely set up fourth fixed block 6 in the bottom of fixed bolster, and fourth fixed block 6 transversely sets up in the clearance between the lower extreme of left side filter set 7 and the lower extreme of right side filter set 8, promptly, through the cooperation of the curb plate of fourth fixed block 6 and fixed bolster, just can be fixed with the lower extreme of the left side filter set 7 that the slope set up and the lower extreme of the right side filter set 8 that the slope set up. When the number of the left filter set 7 and the right filter set 8 is changed according to the requirement of the transmittance, the length of the fourth fixing block 6 also needs to be correspondingly changed, so that the lower ends of the obliquely arranged left filter set 7 and the right filter set 8 can be stably arranged at the bottom of the fixing support.
In the embodiment of the invention, the fourth fixing block is arranged at the bottom of the fixing support to stably fix the lower end of the left filter set and the lower end of the right filter set on the fixing support, so that the situation that the filters of the left filter set and the right filter set move relatively in the calibration process is avoided, the stability of the spectral neutral filter device is improved, and the calibration accuracy of the spectral neutral filter device is further improved.
In addition, the combination of the first fixed block 3, the second fixed block 4, the third fixed block 5 and the fourth fixed block 6 can stably fix the upper ends and the lower ends of the left filter set 7 and the right filter set 8, so that the situation that the filters in the left filter set 7 and the right filter set 8 move relatively is avoided in the calibration process, and the stability of the spectral neutral filter device is further improved.
On the basis of the above embodiments, the included angle between the left filter set 7 and the horizontal direction is 5 ° to 15 °, and the included angle between the right filter set 8 and the horizontal direction is-5 ° to-15 °.
Specifically, if left filter set 7 is set to have an angle of 5 ° to 15 ° with the horizontal direction and right filter set 8 is set to have an angle of-5 ° to-15 ° with the horizontal direction, for example, if left filter set 7 is set to have an angle of 5 °, 10 °, 15 ° with the horizontal direction, etc., right filter set 8 is set to have an angle of-5 °, -10 °, -15 °, etc. with the horizontal direction. Therefore, the inclination angles of the left filter set 7 and the right filter set 8 are limited in a proper range, reflected light 2 of incident light 1 can be reflected to other angles well, repeated reflection of the reflected light 2 between the filters is effectively avoided to reach a detector, and the measured transmittance is higher than a theoretical value.
Therefore, the included angle between the left filter set 7 and the horizontal direction is set to be 5-15 degrees, the included angle between the right filter set 8 and the horizontal direction is set to be-5-15 degrees, the spectral neutral filter device can calibrate the transmittance more accurately, and the accuracy of the spectral neutral filter device is improved.
On the basis of the above embodiments, the number of the high-purity quartz filters of the left filter set 7 and the right filter set 8 is 8. The number of the high-purity quartz filters of the left filter set 7 and the right filter set 8 is 10. The number of the high-purity quartz filters of the left filter set 7 and the right filter set 8 is 15.
Specifically, when the transmittance of light (i.e., including the ultraviolet band, the visible band, and the near-infrared band) is required to be close to 30%, as can be seen from fig. 3, the number of required high-purity quartz filters is 16, then the number of quartz filters in left filter set 7 and right filter set 8 is set to 8, and the transmittance of the obtained spectral neutral density filter device is 30%.
When the transmittance of light (i.e., including the ultraviolet band, the visible band, and the near-infrared band) is required to be close to 20%, as can be seen from fig. 3, the number of the required high-purity quartz filters is 20, then the number of the quartz filters of the left filter set 7 and the right filter set 8 is set to 10, and the transmittance of the obtained spectral neutral filter device is 20%.
When the transmittance of light (i.e., including the ultraviolet band, the visible band, and the near-infrared band) is required to be close to 10%, as can be seen from fig. 3, the number of the required high-purity quartz filters is 30, then the number of the quartz filters in the left filter set 7 and the right filter set 8 is set to 8, and the transmittance of the obtained spectral neutral filter device is 10%.
The following description is made by taking a spectral neutral density filter having a transmittance of approximately 30% as an example, but the scope of the present invention is not limited thereto. Dividing 16 high-purity quartz filters into 2 groups (the number of the filters must be even in principle), wherein 8 filters are stacked together to form a left filter group 7 which is arranged on the left side of the fixed support, and the upper end of the left filter group 7 is arranged between the first fixed block 3 and the second fixed block 4; the lower end of the left filter set 7 is arranged between the left edge of the fixed bracket and the fourth fixed block 6. In addition, 8 filters are stacked together to form a right filter set 8, and the upper end of the right filter set 8 is arranged between the second fixing block 4 and the third fixing block 5; the lower end of the right filter set 8 is arranged between the fourth fixing block 6 and the right edge of the fixing bracket. After the arrangement is completed, the distances among the first fixed block 3, the second fixed block 4 and the third fixed block 5 are finely adjusted, so that the optical filters in the left optical filter group 7 and the right optical filter group 8 cannot move relatively. And the included angle between the left filter set 7 and the horizontal direction is 10 degrees; the right filter set 8 forms an angle of-10 ° with the horizontal.
Incident light horizontally enters from the left side, and after passing through the left filter set 7, the reflected light 2 is emitted to the other side, so that the problem that the measured transmission ratio is higher due to the fact that light returns along the original path is effectively solved. Because left filter set 7 is at an angle with respect to the incident direction of the light, incident light 1 will slightly shift upward and deviate from the original position. After the light passes through right filter set 8, the light will reverse and shift downward and return to the original incident straight line due to the symmetry of right filter set 8 and left filter set 7.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A spectrally neutral filtering arrangement, comprising: a left filter set and a right filter set;
An included angle between the transmission surface of the left filter set and the horizontal direction is an acute angle, an included angle between the transmission surface of the right filter set and the horizontal direction is a negative angle, and the size of the negative angle is the same as that of the acute angle;
the left filter set and the right filter set are formed by sequentially stacking a plurality of high-purity quartz filters with the same number.
2. the spectral neutral density filter of claim 1, wherein the substrate of the high purity quartz filter is a quartz glass plate, and the thickness of the quartz glass plate is 10um to 50 um.
3. The spectrally neutral filtering apparatus of claim 1 further comprising: a fixed bracket having a side plate disposed around an edge of a bottom of the fixed bracket,
The bottom of the left side filter set and the bottom of the right side filter set are in contact with the bottom of the fixed support, the left side edge of the lower end of the left side filter set is in contact with the left side edge of the side plate, and the right side edge of the lower end of the right side filter set is in contact with the right side edge of the side plate.
4. The spectrally neutral filtering apparatus of claim 3 further comprising: the first fixing block, the second fixing block and the third fixing block are sequentially and vertically arranged on the upper part of the fixing support;
The upper end of the left filter set extends into a gap between the first fixed block and the second fixed block, and two side edges of the upper end of the left filter set are respectively contacted with the first fixed block and the second fixed block;
And the upper end of the right filter set extends into a gap between the second fixed block and the third fixed block, and two side edges of the upper end of the right filter set are respectively contacted with the second fixed block and the third fixed block.
5. The spectrally neutral filtering apparatus of claim 3 further comprising: the fourth fixed block is transversely arranged at the bottom of the fixed support and is transversely arranged in a gap between the lower end of the left filter set and the lower end of the right filter set;
And the left side of the fourth fixed block contacts with the right side of the left side optical filter set, and the right side of the fourth fixed block contacts with the left side of the right side optical filter set.
6. The spectrally neutral filter arrangement of claim 1 wherein said left filter set is at an angle of 5 ° to 15 ° to the horizontal and said right filter set is at an angle of-5 ° to-15 ° to the horizontal.
7. the spectrally neutral filter arrangement of any one of claims 1 to 6 wherein the number of high purity quartz filters of both said left filter set and said right filter set is 8.
8. the spectrally neutral filter arrangement of any one of claims 1 to 6 wherein the number of high purity quartz filters of both said left filter set and said right filter set is 10.
9. The spectrally neutral filter arrangement of any one of claims 1 to 6 wherein the number of high purity quartz filters of both said left filter set and said right filter set is 15.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248737.5A CN107976734B (en) | 2017-12-01 | 2017-12-01 | spectrum neutral light filtering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248737.5A CN107976734B (en) | 2017-12-01 | 2017-12-01 | spectrum neutral light filtering device |
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| Publication Number | Publication Date |
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| CN107976734A CN107976734A (en) | 2018-05-01 |
| CN107976734B true CN107976734B (en) | 2019-12-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142304A (en) * | 1986-12-04 | 1988-06-14 | Matsushita Electric Ind Co Ltd | Crystal optical filter |
| JPH06230218A (en) * | 1993-01-30 | 1994-08-19 | Nippon Dempa Kogyo Co Ltd | Quartz optical filter |
| CN201285457Y (en) * | 2008-11-14 | 2009-08-05 | 中国计量科学研究院 | An optical filter |
| CN102384839A (en) * | 2010-09-06 | 2012-03-21 | 信义超薄玻璃(东莞)有限公司 | Device for obtaining optical performance of glass |
| EP2752696A1 (en) * | 2013-01-03 | 2014-07-09 | Tien-Pei Meng | Multi-ring optical filter assembly allowing independent adjustment of rotation angle of each filter element thereof |
| CN206292412U (en) * | 2016-12-29 | 2017-06-30 | 东莞市蓝盾机电设备科技有限公司 | A kind of UV quartz plate filters |
-
2017
- 2017-12-01 CN CN201711248737.5A patent/CN107976734B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142304A (en) * | 1986-12-04 | 1988-06-14 | Matsushita Electric Ind Co Ltd | Crystal optical filter |
| JPH06230218A (en) * | 1993-01-30 | 1994-08-19 | Nippon Dempa Kogyo Co Ltd | Quartz optical filter |
| CN201285457Y (en) * | 2008-11-14 | 2009-08-05 | 中国计量科学研究院 | An optical filter |
| CN102384839A (en) * | 2010-09-06 | 2012-03-21 | 信义超薄玻璃(东莞)有限公司 | Device for obtaining optical performance of glass |
| EP2752696A1 (en) * | 2013-01-03 | 2014-07-09 | Tien-Pei Meng | Multi-ring optical filter assembly allowing independent adjustment of rotation angle of each filter element thereof |
| CN206292412U (en) * | 2016-12-29 | 2017-06-30 | 东莞市蓝盾机电设备科技有限公司 | A kind of UV quartz plate filters |
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| Publication number | Publication date |
|---|---|
| CN107976734A (en) | 2018-05-01 |
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