CN202092666U - Photoelectric sensing device - Google Patents
Photoelectric sensing device Download PDFInfo
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- CN202092666U CN202092666U CN2011200940979U CN201120094097U CN202092666U CN 202092666 U CN202092666 U CN 202092666U CN 2011200940979 U CN2011200940979 U CN 2011200940979U CN 201120094097 U CN201120094097 U CN 201120094097U CN 202092666 U CN202092666 U CN 202092666U
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- sawtooth
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- light receiving
- receiving unit
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Abstract
A photoelectric sensing device comprises a light projecting unit and a light receiving unit, wherein the light projecting unit consists of a light transmitting unit and a sawtooth lens, the sawtooth lens consists of a row of sawtooth queue, the light transmitting unit is positioned at one end of the sawtooth queue and transmits light beams towards the sawtooth queue, each sawtooth consists of a first surface and a second surface, the first surface of each sawtooth is closer to the light transmitting unit than the second surface of each sawtooth, the first surface of each sawtooth, except for the sawtooth furthest away from the light transmitting unit, is provided with a reflective coating capable of leading the light beams transmitted by the light transmitting unit to generate partial transmission and partial reflection to the light receiving unit, the first surface of the sawtooth furthest away from the light transmitting unit is provided with a reflective coating capable of leading the light beam transmitted by the light transmitting unit to generate full reflection, or partial transmission, and partial reflection to the light receiving unit. In the photoelectric sensing device, the number of the light transmitting units and the manufacturing cost are reduced.
Description
Technical field
The utility model relates to a kind of photoelectric sensing apparatus.
Background technology
Photoelectric sensing apparatus is to adopt the sensor of photovalve as detecting element, and it utilizes object to be detected that the shading or the light inlet of light beam are come object to be detected is detected.Present photoelectric sensing apparatus comprises the photoelectric sensing apparatus of correlation type, that is, and and the photoelectric sensing apparatus that constitutes by the light projector unit and the light receiving unit of face-to-face placement.In the photoelectric sensing apparatus of correlation type, the light projector unit comprises such as the light-emitting component of infrarede emitting diode (LED), is used for projection light, and light receiving unit comprises the photovalve such as infrared photodiode (PD), is used to accept the light of light projector unit projection.
Fig. 1 has shown the structural representation of existing photoelectric sensing apparatus.As shown in Figure 1, this photoelectric sensing apparatus 1 comprises light projector unit 11 and light receiving unit 12, and wherein light projector unit 11 comprises a plurality of infrared LEDs 111, and light receiving unit 12 comprises a plurality of infrared PD121.A plurality of LED111 are arranged in delegation with the spacing space that equates, a plurality of PD121 also are arranged in delegation with the spacing space that equates, and corresponding one by one mutually installation between a plurality of LED111 and a plurality of PD121.Shadow region between light projector unit 11 shown in Fig. 1 and the light receiving unit 12 is meant the surveyed area B that object to be detected can be detected.
For photoelectric sensing apparatus 1, owing to need corresponding one by one mutually installation between a plurality of LED111 and a plurality of PD121, therefore, need take time and energy carries out light.
In addition, in photoelectric sensing apparatus 1, as shown in Figure 1, what LED111 sent is not directional light.Therefore, can produce interference between the light that each LED111 sends, thereby influence the testing result of photoelectric sensing apparatus 1.And, not that arrange the space between directional light and a plurality of LED111 because LED111 sends, therefore caused between per two adjacent LED111, all existing detection blind area A.Object to be detected can't be detected in detecting blind area A.
In addition, because photoelectric sensing apparatus 1 has adopted structure as shown in Figure 1, so the size of object to be detected is restricted.The size of object to be detected must be more than or equal to the minimum detectable size, otherwise, may cause object to be detected to be detected.The minimum detectable size is meant the minimum dimension that object to be detected always can be detected between light projector unit 11 and light receiving unit 12.As shown in Figure 1, in photoelectric sensing apparatus 1, the minimum detectable size equals the space D between two LED111 of adjacent arrangement.
Spacing between two LED111 of adjacent arrangement more hour, the minimum detectable size of object to be detected is also just more little.Therefore, when needs shorten the minimum detectable size of object to be detected, just must adjust the spacing between the LED111, promptly shorten the spacing between the LED111, also to correspondingly shorten the spacing between the PD121 simultaneously, like this, under the prerequisite of the size that does not change photoelectric sensing apparatus 1, just must increase the number of LED111 and PD121, thereby cause the manufacturing cost of photoelectric sensing apparatus 1 to increase.And, because each LED is mounted on the circuit substrate (not shown), therefore, in the time need adjusting, just must adjust the position that mounts the LED pad on the substrate to the spacing between the LED111, expend time in so very much and manpower.
The utility model content
In view of the above problems, the utility model provides a kind of photoelectric sensing apparatus.Photoelectric sensing apparatus of the present utility model only needs a luminescence unit, has reduced the quantity of luminescence unit widely, has reduced manufacturing cost.
A kind of photoelectric sensing apparatus of the present utility model comprises light projector unit and light receiving unit, and light projector unit and light receiving unit are separately positioned on two opposite sides, and light projector unit projection light, light receiving unit are accepted the light of light projector unit projection, wherein:
The light projector unit comprises luminescence unit and serrate lens, and wherein the serrate lens comprise delegation's sawtooth formation that a plurality of sawtooth are arranged in a linear;
Luminescence unit is positioned at an end place of sawtooth formation, and sends light beam along the orientation of a plurality of sawtooth to the sawtooth formation;
Each sawtooth in a plurality of sawtooth all comprises first surface and second surface, the first surface of each sawtooth is than the more close luminescence unit of its second surface, in the saw-tooth shaped cross section of serrate lens, each serrate becomes by the first surface triangle that pairing limit, second surface pairing limit and the 3rd limit in saw-tooth shaped cross section constitute in saw-tooth shaped cross section, wherein
On the first surface of each sawtooth except a distance luminescence unit sawtooth farthest, all be provided with and make light beam part transmission that luminescence unit sends and to the reflectance coating of light receiving unit partial reflection,
The first surface of a distance luminescence unit sawtooth farthest is provided with and makes light beam that luminescence unit sends to light receiving unit total reflection or part transmission and to the reflectance coating of light receiving unit partial reflection,
In the formed triangle of each sawtooth, the first surface of each sawtooth in saw-tooth shaped cross section the angle between pairing limit and the 3rd limit less than 90 degree, the second surface of each sawtooth in saw-tooth shaped cross section the angle between pairing limit and the 3rd limit smaller or equal to 90 degree
Light receiving unit is the face light receiving unit, and the size of the light region of acceptance of light receiving unit is big or small corresponding with the zone that needs to detect.
In the formed triangle of each sawtooth, the second surface of each sawtooth in saw-tooth shaped cross section the angle between pairing limit and the 3rd limit more than or equal to the first surface of each sawtooth angle between pairing limit and the 3rd limit in saw-tooth shaped cross section.
Luminescence unit is a pointolite.The tooth depth of a plurality of sawtooth is identical, and the optical axis of luminescence unit is parallel to the orientation of a plurality of sawtooth and is positioned on the halfline of center tooth depth of a plurality of sawtooth.
The size of the light region of acceptance of light receiving unit and light projector unit are big or small identical to the zone of the light beam of light receiving unit projection.
Photoelectric sensing apparatus of the present utility model utilizes the serrate lens to reflect and reflects the light beam that luminescence unit sends, and therefore only needs a luminescence unit, thereby has reduced the quantity of luminescence unit widely, has reduced the manufacturing cost of photoelectric sensing apparatus.
In addition, the light projector unit of photoelectric sensing apparatus of the present utility model carries out light projector by reflection and the refraction principle that utilizes the serrate lens, line source can be transformed into area source, thereby has enlarged the light projector scope.Again because be converted into the multi beam directional light after the reflection of the light beam that luminescence unit sends through the serrate lens, so can improve the interference between each optical axis and reduce to detect the blind area.
In addition, in photoelectric sensing apparatus of the present utility model, can adjust the minimum detectable size of object to be detected by the serrate lens that replacing has different jaggy pitch and a zigzag fashion, so that greatly shorten the minimum detectable size of object to be detected, even can make the size of object to be detected unrestricted.In addition, change the serrate lens, need not change the respective pad on the substrate, saved time and cost that substrate is revised.
Description of drawings
Fig. 1 has shown the structural representation of existing photoelectric sensing apparatus;
Fig. 2 has shown the structural representation according to photoelectric sensing apparatus of the present utility model;
Fig. 3 has shown the stereographic map according to first example of the serrate lens in the photoelectric sensing apparatus of the present utility model;
Fig. 4 has shown the sectional view according to first example of the serrate lens in the photoelectric sensing apparatus of the present utility model;
Fig. 5 has shown the sectional view according to second example of the serrate lens in the photoelectric sensing apparatus of the present utility model;
Fig. 6 has shown the sectional view according to the 3rd example of the serrate lens in the photoelectric sensing apparatus of the present utility model.
Embodiment
Hereinafter will be described with reference to the drawings according to embodiment of the present utility model.
Fig. 2 has shown the structural representation according to photoelectric sensing apparatus of the present utility model.As shown in Figure 2, photoelectric sensing apparatus 2 of the present utility model comprises light projector unit 21 and light receiving unit 22, and light projector unit 21 and light receiving unit 22 are separately positioned on two opposite sides.Light projector unit 21 is used for projection light, and light receiving unit 22 is used to accept the light of light projector unit 21 projections.
As shown in Figure 2, light projector unit 21 comprises luminescence unit 211 and serrate lens 212.Luminescence unit 211 is a pointolite.In the present embodiment, luminescence unit 211 can be infrarede emitting diode (LED).
Each sawtooth in a plurality of sawtooth of serrate lens 212 all comprises first surface and second surface, the first surface of each sawtooth is than the more close luminescence unit 211 of its second surface, in the saw-tooth shaped cross section of serrate lens 212, each serrate becomes by the first surface triangle that pairing limit, second surface pairing limit and the 3rd limit in saw-tooth shaped cross section constitute in saw-tooth shaped cross section.On the first surface of each sawtooth except distance luminescence unit 211 sawtooth farthest, all be provided with and make light beam part transmission that luminescence unit 211 sends and to the reflectance coating of light receiving unit 22 partial reflections.The first surface of distance luminescence unit 211 sawtooth farthest is provided with and makes light beam that luminescence unit 211 sends to light receiving unit total reflection or part transmission and to the reflectance coating of light receiving unit 22 partial reflections.In the formed triangle of each sawtooth, the angle between pairing limit and the 3rd limit is less than 90 degree in saw-tooth shaped cross section for the first surface of each sawtooth, and the second surface of each sawtooth pairing limit in saw-tooth shaped cross section is spent smaller or equal to 90 with the angle between the 3rd limit.
The tooth depth of a plurality of sawtooth of serrate lens 212 is identical, and the optical axis of luminescence unit 22 is parallel to the orientation of a plurality of sawtooth and is positioned on the halfline of center tooth depth of a plurality of sawtooth.
Light receiving unit 22 is face light receiving units, and the size of the light region of acceptance of light receiving unit 22 is big or small corresponding with the zone that needs to detect.In the present embodiment, light receiving unit 22 can be an infrared photodiode (PD) 221.
The size of the light region of acceptance of light receiving unit 22 and light projector unit 21 are big or small identical to the zone of the light beam of light receiving unit 22 projections.
Photoelectric sensing apparatus of the present utility model utilizes the serrate lens to reflect and reflects the light beam that luminescence unit sends, and therefore only needs a luminescence unit, thereby has reduced the quantity of luminescence unit widely, has reduced the manufacturing cost of photoelectric sensing apparatus.
In addition, reflection and the refraction principle of the light projector unit of photoelectric sensing apparatus of the present utility model by utilizing the serrate lens carries out light projector, line source can be transformed into area source, thereby enlarged the light projector scope.Again because be converted into the multi beam directional light after the reflection of the light beam that sends of luminescence unit through the serrate lens, thus the interference between each optical axis can be improved, and can reduce to detect the blind area.
In addition, photoelectric sensing apparatus of the present utility model is because the mode that adopts luminescence unit and serrate lens to combine constitutes the light projector unit, therefore, when needs are adjusted the minimum detectable size of object to be detected, only need to change the serrate lens, and need not change respective pad on the substrate, saved time and cost that substrate is revised.
Below in conjunction with Fig. 3 to Fig. 6 the structure of the serrate lens 212 in the photoelectric sensing apparatus 2 of the present utility model is described.
First example of serrate lens 212 is described with reference to Fig. 3 and Fig. 4.Fig. 3 has shown the stereographic map according to first example of the serrate lens 212 in the photoelectric sensing apparatus 2 of the present utility model.Fig. 4 has shown the sectional view according to first example of the serrate lens 212 in the photoelectric sensing apparatus 2 of the present utility model.
As shown in Figure 3 and Figure 4, serrate lens 212 comprise delegation's sawtooth formation that a plurality of sawtooth are arranged in a linear.Luminescence unit 211 is positioned at an end place of sawtooth formation, and sends light beam along the orientation of a plurality of sawtooth to the sawtooth formation.Each sawtooth in a plurality of sawtooth of serrate lens 212 all comprises first surface S1 and second surface S2, and the first surface S1 of each sawtooth is than the more close luminescence unit 211 of its second surface S2.On the first surface S1 of each sawtooth except distance luminescence unit 211 sawtooth farthest, all be provided with and make light beam part transmission that luminescence unit 211 sends and to the reflectance coating of light receiving unit 22 partial reflections.The first surface S1 of distance luminescence unit 211 sawtooth farthest is provided with and makes light beam that luminescence unit 211 sends to light receiving unit 22 total reflections or part transmission and to the reflectance coating of light receiving unit 22 partial reflections.
As shown in Figure 4, in the saw-tooth shaped cross section of serrate lens 212, each sawtooth is formed by first surface S1 pairing limit L1, second surface S2 pairing limit L2 and the 3rd limit L3 in saw-tooth shaped cross section in saw-tooth shaped cross section and forms a triangle.In the formed triangle of each sawtooth, first surface S1 in saw-tooth shaped cross section the angle α between pairing limit L1 and the 3rd limit L3 less than 90 degree, the angle β between pairing limit L2 and the 3rd limit L3 is greater than first surface S1 angle α between pairing limit L1 and the 3rd limit L3 in saw-tooth shaped cross section in saw-tooth shaped cross section for second surface S2, and second surface S2 angle β between pairing limit L2 and the 3rd limit L3 in saw-tooth shaped cross section equals 90 degree.
Second example with reference to the serrate lens 212 of Fig. 5 explanation.Fig. 5 has shown the sectional view according to second example of the serrate lens 212 in the photoelectric sensing apparatus 2 of the present utility model.
As shown in Figure 5, in the saw-tooth shaped cross section of serrate lens 212, each sawtooth is formed by first surface S1 pairing limit L1, second surface S2 pairing limit L2 and the 3rd limit L3 in saw-tooth shaped cross section in saw-tooth shaped cross section and forms a triangle.In the formed triangle of each sawtooth, first surface S1 in saw-tooth shaped cross section the angle α between pairing limit L1 and the 3rd limit L3 less than 90 degree, second surface S2 in saw-tooth shaped cross section the angle β between pairing limit L2 and the 3rd limit L3 less than 90 degree, second surface S2 in saw-tooth shaped cross section the angle β between pairing limit L2 and the 3rd limit L3 greater than first surface S1 angle α between pairing limit L1 and the 3rd limit L3 in saw-tooth shaped cross section.
The 3rd example with reference to the serrate lens 212 of Fig. 6 explanation.Fig. 6 has shown the sectional view according to the 3rd example of the serrate lens 212 in the photoelectric sensing apparatus 2 of the present utility model.
As shown in Figure 6, in the saw-tooth shaped cross section of serrate lens 212, each sawtooth is formed by first surface S1 pairing limit L1, second surface S2 pairing limit L2 and the 3rd limit L3 in saw-tooth shaped cross section in saw-tooth shaped cross section and forms a triangle.In the formed triangle of each sawtooth, the angle α between pairing limit L1 and the 3rd limit L3 is less than 90 degree in saw-tooth shaped cross section for first surface S1, and second surface S2 angle β between pairing limit L2 and the 3rd limit L3 in saw-tooth shaped cross section equals first surface S1 angle α between pairing limit L1 and the 3rd limit L3 in saw-tooth shaped cross section.
The structure that can be applicable to serrate lens 212 of the present utility model is not limited to the structure that provides in first to the 3rd example of above explanation, and various changes can be made in not breaking away from claims restricted portion of the present utility model.
Though through the utility model is described in conjunction with specific embodiments, for those skilled in the art, according to manyly substituting of making after the narration above, revise with variation will be apparent.Therefore, when such substituting, within the spirit and scope that modifications and variations fall into attached claim the time, should being included in the utility model.
Claims (5)
1. a photoelectric sensing apparatus comprises light projector unit and light receiving unit, and described light projector unit and described light receiving unit are separately positioned on two opposite sides, and described light projector unit projection light, described light receiving unit are accepted the light of described light projector unit projection, it is characterized in that:
Described light projector unit comprises luminescence unit and serrate lens, and wherein said serrate lens comprise delegation's sawtooth formation that a plurality of sawtooth are arranged in a linear;
Described luminescence unit is positioned at an end place of described sawtooth formation, and sends light beam along the orientation of described a plurality of sawtooth to described sawtooth formation;
Each sawtooth in described a plurality of sawtooth all comprises first surface and second surface, the first surface of each sawtooth is than the more close described luminescence unit of its second surface, in the saw-tooth shaped cross section of described serrate lens, each serrate becomes by the described first surface triangle that pairing limit, described second surface pairing limit and the 3rd limit in described saw-tooth shaped cross section constitute in described saw-tooth shaped cross section, wherein
On the described first surface of each sawtooth except a distance described luminescence unit sawtooth farthest, all be provided with and make light beam part transmission that described luminescence unit sends and to the reflectance coating of described light receiving unit partial reflection,
The described first surface of a distance described luminescence unit sawtooth farthest is provided with and makes light beam that described luminescence unit sends to described light receiving unit total reflection or part transmission and to the reflectance coating of described light receiving unit partial reflection,
In the formed triangle of each sawtooth, the described first surface of each sawtooth in described saw-tooth shaped cross section the angle between pairing limit and described the 3rd limit less than 90 degree, the described second surface of each sawtooth in described saw-tooth shaped cross section the angle between pairing limit and described the 3rd limit smaller or equal to 90 degree
Described light receiving unit is the face light receiving unit, and the size of the light region of acceptance of described light receiving unit is big or small corresponding with the zone that needs to detect.
2. photoelectric sensing apparatus as claimed in claim 1 is characterized in that,
In the formed triangle of each sawtooth, the described second surface of each sawtooth in described saw-tooth shaped cross section the angle between pairing limit and described the 3rd limit more than or equal to the described first surface of each sawtooth angle between pairing limit and described the 3rd limit in described saw-tooth shaped cross section.
3. photoelectric sensing apparatus as claimed in claim 1 is characterized in that, described luminescence unit is a pointolite.
4. photoelectric sensing apparatus as claimed in claim 3 is characterized in that,
The tooth depth of described a plurality of sawtooth is identical, and the optical axis of described luminescence unit is parallel to the orientation of described a plurality of sawtooth and is positioned on the halfline of center tooth depth of described a plurality of sawtooth.
5. photoelectric sensing apparatus as claimed in claim 1 is characterized in that,
The size of the light region of acceptance of described light receiving unit and described light projector unit are big or small identical to the zone of the light beam of described light receiving unit projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200940979U CN202092666U (en) | 2011-03-31 | 2011-03-31 | Photoelectric sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200940979U CN202092666U (en) | 2011-03-31 | 2011-03-31 | Photoelectric sensing device |
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| Publication Number | Publication Date |
|---|---|
| CN202092666U true CN202092666U (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200940979U Expired - Fee Related CN202092666U (en) | 2011-03-31 | 2011-03-31 | Photoelectric sensing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2952951A1 (en) | 2014-06-02 | 2015-12-09 | Schneider Electric Industries SAS | Detection system |
| CN105371094A (en) * | 2014-08-08 | 2016-03-02 | 欧姆龙株式会社 | Multi-optical axis photoelectric sensor |
| CN106323917A (en) * | 2015-07-03 | 2017-01-11 | 现代自动车株式会社 | Rain sensor having frost sensing function |
| CN108253380A (en) * | 2016-12-28 | 2018-07-06 | 苏州欧普照明有限公司 | A kind of optical element and the lighting device with the optical element |
| CN109387996A (en) * | 2017-08-02 | 2019-02-26 | 广州本安信息科技有限公司 | A kind of laterally homogeneous illumination identification structure of detonator |
| CN109946794A (en) * | 2017-12-20 | 2019-06-28 | 广州市合熠电子科技有限公司 | A kind of poly-lens region detection type fibre optical sensor |
-
2011
- 2011-03-31 CN CN2011200940979U patent/CN202092666U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2952951A1 (en) | 2014-06-02 | 2015-12-09 | Schneider Electric Industries SAS | Detection system |
| CN105371094A (en) * | 2014-08-08 | 2016-03-02 | 欧姆龙株式会社 | Multi-optical axis photoelectric sensor |
| CN105371094B (en) * | 2014-08-08 | 2018-06-26 | 欧姆龙株式会社 | Multi-beam photoelectric sensor |
| CN106323917A (en) * | 2015-07-03 | 2017-01-11 | 现代自动车株式会社 | Rain sensor having frost sensing function |
| CN106323917B (en) * | 2015-07-03 | 2021-02-09 | 现代自动车株式会社 | Rainwater sensor with frost sensing function |
| CN108253380A (en) * | 2016-12-28 | 2018-07-06 | 苏州欧普照明有限公司 | A kind of optical element and the lighting device with the optical element |
| CN109387996A (en) * | 2017-08-02 | 2019-02-26 | 广州本安信息科技有限公司 | A kind of laterally homogeneous illumination identification structure of detonator |
| CN109946794A (en) * | 2017-12-20 | 2019-06-28 | 广州市合熠电子科技有限公司 | A kind of poly-lens region detection type fibre optical sensor |
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| GR01 | Patent grant | ||
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Granted publication date: 20111228 Termination date: 20120331 |