CN203630385U - A combined type optical filter, a optical filter switching mechanism and a monitor camera - Google Patents
A combined type optical filter, a optical filter switching mechanism and a monitor camera Download PDFInfo
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- CN203630385U CN203630385U CN201320893971.4U CN201320893971U CN203630385U CN 203630385 U CN203630385 U CN 203630385U CN 201320893971 U CN201320893971 U CN 201320893971U CN 203630385 U CN203630385 U CN 203630385U
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Abstract
The utility model relates to the technical field of intelligent traffic monitoring, and especially relates to a combined type optical filter, a optical filter switching mechanism and a monitor camera. The combined type optical filter, the optical filter switching mechanism and the monitor camera of the utility model are used for raising the filtering effect of the combined type optical filter in order to guarantee the imaging quality of the monitor camera. The combined type optical filter disclosed by the utility model comprises a first optical substrate and a second optical substrate which are arranged in a corresponding mode. The periphery of the first optical substrate and the periphery of the second optical substrate are sealed to form a sealed cavity. The combined type optical filter disclosed by the utility model also comprises an infrared cutoff filter and a polaroid positioned inside the sealed cavity. The infrared cutoff filter is arranged on a surface, facing the second optical substrate, of the first optical substrate. The polaroid is arranged on a surface, facing the first optical substrate, of the second optical substrate. The utility model simultaneously discloses the optical filter switching mechanism which comprises the above combined type optical filter. The utility model also simultaneously discloses the monitor camera which comprises the above optical filter switching mechanism.
Description
Technical field
The utility model relates to intelligent traffic monitoring technical field, particularly a kind of composite absorber, optical filter switching mechanism and CCTV camera.
Background technology
At present, in intelligent traffic monitoring technical field, be widely used CCTV camera passing vehicle is carried out to vehicle speed measurement and the evidence obtaining of making a dash across the red light, in order to guarantee monitor message accurately and reliably, the image that requires CCTV camera to take can reflect the face-image of human pilot in vehicle, car plate and car clearly.
In existing CCTV camera, be conventionally provided with optical filter switching mechanism guarantee CCTV camera by day with the image quality at night, this optical filter switching mechanism comprises and is applicable to the first optical filter of taking daytime and the second optical filter of applicable shooting at night; Wherein, the first optical filter is composite absorber, the polarized light reflecting to form for ending infrared light and cut-off light, and the second optical filter is full impregnated optical filter, to guarantee the brightness of image.While shooting by day, this optical filter switching mechanism makes the first optical filter be switched in the imaging optical path of CCTV camera and aims at the imageing sensor in CCTV camera, make CCTV camera possess IR-cut function and polarization function, guarantee the image quality of CCTV camera with this; In the time of shooting at night, this optical filter switching mechanism is removed the first optical filter, make the second optical filter be switched in the imaging optical path of CCTV camera and aim at the imageing sensor in CCTV camera, make CCTV camera sensitization or make CCTV camera possess IR-cut function to greatest extent, guarantee the image quality of CCTV camera with this.
As shown in Figure 1, be the structural representation of a kind of composite absorber in prior art; Described composite absorber comprises: underlay substrate 102, is attached to the cutoff filter 101 on a side of underlay substrate 102, and is attached on another side of underlay substrate 102 and the polaroid 103 relative with cutoff filter 101; Use this composite absorber can end infrared light and the polarized light that reflects to form of cut-off light, thus the image quality can improve CCTV camera and take by day time.
But, present inventor finds, in combinations thereof formula optical filter is arranged on to the process on optical filter switching mechanism or optical filter switching mechanism being arranged in the process on CCTV camera, because cutoff filter 101 and polaroid 103 are positioned at the outside of underlay substrate 102, easily scratch cutoff filter 101 and polaroid 103 and affect the filter effect of composite absorber, thereby affect the image quality of CCTV camera; In addition, in the time that CCTV camera uses in wet environment, because cutoff filter 101 and polaroid 103 are positioned at the outside of underlay substrate 102, moisture can affect cut-off effect, the even inefficacy of polaroid 103 to polarized light, thereby affect the filter effect of composite absorber, and then affect the image quality of CCTV camera.
Utility model content
The purpose of this utility model is to provide a kind of composite absorber, optical filter switching mechanism and CCTV camera, for improving the filter effect of composite absorber, to guarantee the image quality of CCTV camera.
To achieve these goals, the utility model provides following technical scheme:
A kind of composite absorber, comprising:
The first optical substrate being oppositely arranged and the second optical substrate, and the peripheral sealing of the periphery of described the first optical substrate and described the second optical substrate forms annular seal space;
Be positioned at cutoff filter and the polaroid of described annular seal space, described cutoff filter is arranged at described the first optical substrate on the face of described the second optical substrate, and described polaroid is arranged at described the second optical substrate on the face of described the first optical substrate.
Preferably, described polaroid is diaphragm type filter disc, is attached at described the second optical substrate on the face of described the first optical substrate.
Preferably, described diaphragm type filter disc has polyethylene film or tygon cyanogen film.
Preferably, described cutoff filter is reflection optical filter or smalt optical filter.
Preferably, in the time that described cutoff filter is smalt optical filter, described cutoff filter and described the first optical substrate are structure as a whole.
Further, combinations thereof formula optical filter also comprises: be arranged at described smalt optical filter the first anti-reflection film on the face of described the second optical substrate dorsad, and/or, be arranged at described the second optical substrate the second anti-reflection film on the face of described smalt optical filter dorsad.
The utility model also provides a kind of optical filter switching mechanism simultaneously, comprising: the composite absorber that technique scheme is carried.
The utility model also provides a kind of CCTV camera simultaneously, comprise: casing, be arranged at imageing sensor and circuit board in described casing, described circuit board is electrically connected with described imageing sensor, and be arranged in described casing, optical filter switching mechanism that technique scheme is carried, described optical filter switching mechanism comprises applicable the first optical filter of use and the second optical filter that applicable shooting at night uses taken daytime, wherein, the composite absorber that described the first optical filter is carried for technique scheme.
Preferably, the cutoff filter of described composite absorber is described imageing sensor dorsad, and the polaroid in described composite absorber is towards described imageing sensor.
Preferably, the thickness difference of described the first optical filter and described the second optical filter meets following formula:
t=d*n/(n-1)
Wherein, t is the thickness difference of the first optical filter and the second optical filter, and d is optical path difference, and d≤0.067mm, and n is the refractive index of the first optical filter and the second optical filter, and the refractive index of the first optical filter is identical with the refractive index of the second optical filter.
In the composite absorber providing at the utility model, cutoff filter and polaroid sealing are arranged between two optical substrates that are oppositely arranged, thereby prevent from damaging cutoff filter and polaroid in assembling process, can guarantee that in addition polaroid did not lose efficacy in wet environment, so can improve the filter effect of composite absorber, thereby can guarantee the image quality of CCTV camera.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of composite absorber in prior art;
The stereographic map of the composite absorber that Fig. 2 provides for the utility model embodiment;
The cut-open view of the composite absorber that Fig. 3 provides for the utility model embodiment;
The explosive view of the CCTV camera that Fig. 4 provides for the utility model embodiment.
Reference numeral:
1-casing, 2-optical filter switching mechanism,
3-imageing sensor, 4-circuit board,
101,252-cutoff filter, 102-underlay substrate,
103,253-polaroid, 251-the first optical substrate,
254-the second optical substrate.
Embodiment
Existing combined filters, because cutoff filter and polaroid are positioned at the outside of underlay substrate, easily affects the filter effect of composite absorber, and then affects the image quality of CCTV camera; In view of this, the utility model provides a kind of improved technical scheme, cutoff filter and polaroid are sealed between two optical substrates that are oppositely arranged, thereby prevent from damaging cutoff filter and polaroid in assembling process, can guarantee that in addition polaroid did not lose efficacy in wet environment, so can improve the filter effect of composite absorber, thereby can guarantee the image quality of CCTV camera.
In order to make those skilled in the art better understand the technical solution of the utility model, below in conjunction with Figure of description, the utility model embodiment is described in detail.
Refer to Fig. 2 and Fig. 3, wherein, the stereographic map of the composite absorber that Fig. 2 provides for the utility model embodiment; The cut-open view of the composite absorber that Fig. 3 provides for the utility model embodiment.The composite absorber that the utility model embodiment provides comprises: the first optical substrate 251 being oppositely arranged and the second optical substrate 254, and the peripheral sealing of the periphery of the first optical substrate 251 and the second optical substrate 254 forms annular seal space; And be positioned at cutoff filter 252 and the polaroid 253 of annular seal space, cutoff filter 252 is arranged at the first optical substrate 251 on the face of the second optical substrate 254, and polaroid 253 is arranged at the second optical substrate 254 on the face of the first optical substrate 251.
When concrete enforcement, first cutoff filter 252 is arranged on the first optical substrate 251, polaroid 253 is arranged on the second optical substrate 254, then utilize sealed plastic box 255 that the first optical substrate 251 and the second optical substrate 254 are sealed, make cutoff filter 252 and polaroid 253 be positioned at the seal cavity that the first optical substrate 251, the second optical substrate 254 and sealed plastic box 255 form.So design, in the production of composite absorber, installation process, can prevent from scratching cutoff filter 252 and polaroid 253, in addition, in the time that this composite absorber is applied in wet environment, can also prevent that moisture from lost efficacy polaroid 253; Therefore, the composite absorber that the utility model embodiment provides, can obviously improve the filter effect of composite absorber, thereby can guarantee the image quality of the CCTV camera that adopts combinations thereof formula optical filter.In addition, cutoff filter 252 and polaroid 253 are arranged between the first optical substrate 251 and the second optical substrate 254, the serviceable life that can improve composite absorber.
Particularly, above-mentioned polaroid 253 can selectively allow the light of certain direction pass through, and is usually used in eliminating or weakening the reflective by force of nonmetallic surface, to eliminate or to alleviate dazzle hot spot in CCTV camera.Preferably, polaroid 253 is diaphragm type filter disc, is attached at the second optical substrate 254 on the face of the first optical substrate 251, and preferably, described diaphragm type filter disc has polyethylene film or tygon cyanogen film.Described polyethylene film or tygon cyanogen film have superfine paliform structure, only allow the light that direction of vibration is identical with the gap of fence to pass through, and do not allow to pass through as the reflected light of the generations such as glass, the water surface or car paint surface, thereby realize polarization function.
It is worth mentioning that, because polaroid 253 is directive, incorrect installation can cause polarization function to lose efficacy, therefore, composite absorber can be designed to rectangle, so can be in the production run of CCTV camera, control very easily 90 ° or 180 ° of directions of polaroid.
Above-mentioned cutoff filter 252 is positioned at the first optical substrate 251 on the face of the second optical substrate 254, cutoff filter 252 allows visible ray to see through and ends or reflects infrared light, can effectively suppress to disturb the infrared light of image quality, thereby the colour reproduction of imageing sensor in raising CCTV camera, can guarantee the image quality of CCTV camera.Particularly, cutoff filter 252 is reflection optical filter or smalt optical filter; Wherein, reflection optical filter is to be sprayed on the first optical substrate 251 to form towards the film on the face of the second optical substrate 254, the realistic colour of reflective infrared light, and reducible object effectively; Smalt optical filter is a kind of a kind of optical filter of making take smalt as raw material, and it reaches the effect of IR-cut by absorbing Infrared.
Preferably, in the time that cutoff filter 252 is smalt optical filter, cutoff filter 252 and the first optical substrate 251 are structure as a whole; In the time adopting smalt optical filter as cutoff filter 252, because of smalt optical filter harder, should not be scratched, therefore, smalt optical filter can be used as the outside surface of composite absorber, that is to say, in the time adopting smalt optical filter as cutoff filter 252, composite absorber can save the first optical substrate 251, now, composite absorber is three-decker, comprises smalt optical filter, polaroid 253 and the second optical substrate 254, to reduce the thickness of composite absorber.
But, because smalt optical filter is in absorbing Infrared, also can absorption portion visible ray, so that affect the transmitance of visible ray, therefore, preferably, combinations thereof formula optical filter also comprises: be arranged at smalt optical filter the first anti-reflection film on the face of the second optical substrate 254 dorsad, and/or, be arranged at the second optical substrate 254 the second anti-reflection film on the face of smalt optical filter dorsad, be provided with one deck anti-reflection film at incidence surface and/or the exiting surface of combinations thereof formula optical filter, to increase the transmittance of visible ray.
The utility model also provides a kind of optical filter switching mechanism simultaneously, comprises the composite absorber that technique scheme is carried.Particularly, above-mentioned optical filter switching mechanism comprises applicable the first optical filter of use and the second optical filter that applicable shooting at night uses taken daytime, wherein, the composite absorber that the first optical filter is carried for technique scheme, in the time switching to the first optical filter, make CCTV camera possess IR-cut function and polarization function; The second optical filter is full impregnated optical filter or cutoff filter, if CCTV camera adopts white light light filling, the second optical filter is cutoff filter, make CCTV camera possess IR-cut function, if CCTV camera adopts infrared light light filling, the second optical filter is full impregnated optical filter, makes CCTV camera sensitization to greatest extent.
The composite absorber that first optical filter of cause in above-mentioned optical filter switching mechanism carried for technique scheme, and combinations thereof formula optical filter has preferably filter effect, there is IR-cut function and polarization function, therefore, can guarantee the image quality of the CCTV camera that adopts above-mentioned optical filter switching mechanism.
Refer to Fig. 4, the explosive view of the CCTV camera providing for the utility model embodiment.The utility model embodiment also provides a kind of CCTV camera simultaneously, comprise: casing 1, be arranged at the imageing sensor 3 and 4 in casing 1, circuit board 4 is electrically connected with imageing sensor 3, and be arranged in casing 1, optical filter switching mechanism 2 that technique scheme is carried, optical filter switching mechanism 2 comprises applicable the first optical filter of use and the second optical filter that applicable shooting at night uses taken daytime, wherein, and the composite absorber that the first optical filter is carried for technique scheme.
In the time adopting above-mentioned CCTV camera Information Monitoring transport information, when take daytime, utilize optical filter switching mechanism 2 to make the first optical filter be switched in the imaging optical path of CCTV camera and alignment image sensor 3, make CCTV camera possess IR-cut function and polarization function, the image quality while guaranteeing that with this CCTV camera is taken daytime; When shooting at night, utilize optical filter switching mechanism 2 that the first optical filter is removed, make the second optical filter be switched in the imaging optical path of CCTV camera and alignment image sensor 3, make CCTV camera sensitization or make CCTV camera possess IR-cut function to greatest extent, the image quality so can guarantee CCTV camera shooting at night time.
Because the polaroid of combinations thereof formula optical filter is directive, therefore, in the preferred light path design of above-mentioned CCTV camera, after light enters in CCTV camera, first by the cutoff filter 252 in the first optical filter, Infrared is filtered out, and then by polaroid 253, polarized light is removed; Therefore, preferably, in above-mentioned CCTV camera, the cutoff filter of described composite absorber is described imageing sensor dorsad, and the polaroid in described composite absorber is towards described imageing sensor.
In the manufacturing process of CCTV camera, can according to the color distortion of cutoff filter 252 and polaroid 253 determine the first optical filter towards, cutoff filter 252 colors are partially red, polaroid 253 colors are partially black; In addition, can also be by adopting the first optical substrate 251 and second optical substrate 254 of different-thickness, by the difference in thickness of the first optical substrate 251 and the second optical substrate 254 determine the first optical filter towards.
Make by optical filter switching mechanism 2 at above-mentioned CCTV camera in process that the first optical filter and the second optical filter switch, because the first optical filter and the second optical filter are different optical filters, therefore, light is by the first optical filter and also just different by occurring to reflect the light distance producing after the second optical filter, this will cause rear Jiao between camera lens and the imageing sensor 3 of CCTV camera to change, finally cause image focusing inaccurate and from clear become fuzzy.Have automatic focusing function if CCTV camera camera lens used is autofocus lens and CCTV camera, CCTV camera can detect this variation and automatically adjust camera lens is focused accurately again so, image is become again clear; But, if CCTV camera camera lens used is tight shot, there is no automatic focusing function, will inevitably cause so the first optical filter and the second optical filter to switch time, there is an edge image focusing inaccurate, thereby cause the image blurring of shooting.
The light distance of light distance and the light that light produces by the first optical filter by the second optical filter generation poor, referred to as optical path difference.Can draw according to experiment test: in the time that optical path difference is not more than 0.067mm, just can make the image on the first optical filter and the second optical filter both sides in the time switching all clear, that is to say, in the design phase of CCTV camera, should guarantee that the optical path difference that the first optical filter and the second optical filter are introduced in the time switching is not more than 0.067mm, guarantee the first optical filter and the second optical filter image that CCTV camera is taken in the time switching is clearly.
The light distance that light produces by the first optical filter and the second optical filter depends primarily on thickness and the refractive index of optical filter, and refractive index is mainly relevant with optical filter material used, in addition, because the thickness of cutoff filter 252 and polaroid 253 is very thin, both are negligible on the impact of optical path difference; So in actual applications, the first optical substrate 251, the second optical substrate 254 and second optical filter of the first optical filter all adopt identical material, the thickness difference of the first optical filter and the second optical filter is controlled within the scope of certain error simultaneously, so just can control well the optical path difference that the first optical filter and the second optical filter are introduced in the time switching.The thickness difference of the first optical filter and the second optical filter meets following formula:
t=d*n/(n-1)，
Wherein, t is the thickness difference of the first optical filter and the second optical filter, and d is optical path difference, and d≤0.067mm, and n is the refractive index of the first optical filter and the second optical filter, and the refractive index of the first optical filter is identical with the refractive index of the second optical filter.For example, in the time that the first optical filter material used with the second optical filter is identical and refractive index n is all 1.5, when optical path difference d is 0.067mm so, the thickness difference of corresponding the first optical filter and the second optical filter is 0.2mm, that is to say, in the error range of will the be controlled at ± 0.1mm of thickness difference of the first optical filter and the second optical filter.
In sum, cutoff filter and polaroid sealing are arranged between two optical substrates that are oppositely arranged, thereby prevent from damaging cutoff filter and polaroid in assembling process, can guarantee that in addition polaroid did not lose efficacy in wet environment, so can improve the filter effect of composite absorber, thereby can guarantee the image quality of CCTV camera.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (10)
1. a composite absorber, is characterized in that, comprising:
The first optical substrate being oppositely arranged and the second optical substrate, and the peripheral sealing of the periphery of described the first optical substrate and described the second optical substrate forms annular seal space;
Be positioned at cutoff filter and the polaroid of described annular seal space, described cutoff filter is arranged at described the first optical substrate on the face of described the second optical substrate, and described polaroid is arranged at described the second optical substrate on the face of described the first optical substrate.
2. composite absorber as claimed in claim 1, is characterized in that, described polaroid is diaphragm type filter disc, is attached at described the second optical substrate on the face of described the first optical substrate.
3. composite absorber as claimed in claim 2, is characterized in that, described diaphragm type filter disc has polyethylene film or tygon cyanogen film.
4. the composite absorber as described in as arbitrary in claim 1-3, is characterized in that, described cutoff filter is reflection optical filter or smalt optical filter.
5. composite absorber as claimed in claim 4, is characterized in that, in the time that described cutoff filter is smalt optical filter, described cutoff filter and described the first optical substrate are structure as a whole.
6. composite absorber as claimed in claim 5, it is characterized in that, also comprise: be arranged at described smalt optical filter the first anti-reflection film on the face of described the second optical substrate dorsad, and/or, be arranged at described the second optical substrate the second anti-reflection film on the face of described smalt optical filter dorsad.
7. an optical filter switching mechanism, is characterized in that, comprising: the composite absorber as described in as arbitrary in claim 1-6.
8. a CCTV camera, it is characterized in that, comprise: casing, be arranged at imageing sensor and circuit board in described casing, described circuit board is electrically connected with described imageing sensor, it is characterized in that, also comprise be arranged in described casing, optical filter switching mechanism as claimed in claim 7, described optical filter switching mechanism comprises applicable the first optical filter of use and the second optical filter that applicable shooting at night uses taken daytime, wherein, described the first optical filter is the composite absorber as described in as arbitrary in claim 1-6.
9. CCTV camera as claimed in claim 8, is characterized in that, the cutoff filter of described composite absorber is described imageing sensor dorsad, and the polaroid in described composite absorber is towards described imageing sensor.
10. CCTV camera as claimed in claim 8 or 9, is characterized in that, the thickness difference of described the first optical filter and described the second optical filter meets following formula:
t=d*n/(n-1)
Wherein, t is the thickness difference of the first optical filter and the second optical filter, and d is optical path difference, and d≤0.067mm, and n is the refractive index of the first optical filter and the second optical filter, and the refractive index of the first optical filter is identical with the refractive index of the second optical filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893971.4U CN203630385U (en) | 2013-12-31 | 2013-12-31 | A combined type optical filter, a optical filter switching mechanism and a monitor camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893971.4U CN203630385U (en) | 2013-12-31 | 2013-12-31 | A combined type optical filter, a optical filter switching mechanism and a monitor camera |
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| CN203630385U true CN203630385U (en) | 2014-06-04 |
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|---|---|---|---|
| CN201320893971.4U Expired - Fee Related CN203630385U (en) | 2013-12-31 | 2013-12-31 | A combined type optical filter, a optical filter switching mechanism and a monitor camera |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017173848A1 (en) * | 2016-04-07 | 2017-10-12 | 周旗辉 | Vehicle-mounted anti-glare lens |
| CN110248072A (en) * | 2019-07-02 | 2019-09-17 | 苏州全视智能光电有限公司 | A kind of optical filter device improving photoelectronic imaging equipment dynamic range |
| CN113665485A (en) * | 2021-08-30 | 2021-11-19 | 东风汽车集团股份有限公司 | Anti-glare system for front windshield of automobile and control method |
-
2013
- 2013-12-31 CN CN201320893971.4U patent/CN203630385U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017173848A1 (en) * | 2016-04-07 | 2017-10-12 | 周旗辉 | Vehicle-mounted anti-glare lens |
| CN110248072A (en) * | 2019-07-02 | 2019-09-17 | 苏州全视智能光电有限公司 | A kind of optical filter device improving photoelectronic imaging equipment dynamic range |
| CN113665485A (en) * | 2021-08-30 | 2021-11-19 | 东风汽车集团股份有限公司 | Anti-glare system for front windshield of automobile and control method |
| CN113665485B (en) * | 2021-08-30 | 2023-12-26 | 东风汽车集团股份有限公司 | Anti-glare system for automobile front windshield and control method |
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