CN203630370U - Zero-blind-area diffuse-reflection-type photoelectric sensor - Google Patents
Zero-blind-area diffuse-reflection-type photoelectric sensor Download PDFInfo
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- CN203630370U CN203630370U CN201320832886.7U CN201320832886U CN203630370U CN 203630370 U CN203630370 U CN 203630370U CN 201320832886 U CN201320832886 U CN 201320832886U CN 203630370 U CN203630370 U CN 203630370U
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- photoelectric sensor
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Abstract
The utility model discloses a zero-blind-area diffuse-reflection-type photoelectric sensor. The photoelectric sensor comprises a lens frame which is internally provided with a reception lens chamber and an emission lens chamber. A support, a reception lens, a shielding shading plate and a reception tube are arranged inside the reception lens chamber. The reception lens is disposed on the support, and the shielding shading plate and the reception tube are sequentially disposed behind the reception lens. A vertical moving mechanism is also arranged inside the reception lens chamber, and connected with the support. The open degree of a light hole of the shielding shading plate corresponds to a vertical moving range of the reception lens. The reception tube adopts a reception tube with a large photosensitive area. The position of the axis of the reception tube corresponds to that of the upper edge of the light hole. The vertical adjusting mechanism drives the lens reception lens to move so as to move received imaging light spots, thereby changing the ratio of received light spots reaching the reception tube.
Description
Technical field
The utility model relates to diffuse reflection type photoelectric sensor, more particularly, relates to a kind of zero blind area diffuse reflection type photoelectric sensor.
Background technology
Diffuse reflection type photoelectric sensor, that transmitter and receiver are placed in one, receiver can not receive the light signal that transmitter sends under normal circumstances, in the time that detection thing enters sensing range, emission of light is mapped to its surface, forms diffuse effect, and part light is reflected back, receiver is received light signal, exports a switch controlling signal.The electric transducer that diffuses has distance adjustment function, need to detect distance adjustment at Industry Control scene or other application scenario, determines sensing range, and its implementation is by regulating receiving end sensitivity, changes detection distance.
Existing diffuse reflection type photoelectric sensor all exists and detects blind area, can not identify the scope of target, for example: be set as 10cm when sensor detects distance, perfect condition is that 10cm can detect object with interior All Ranges, but when object leans on to such an extent that cross, light reflection loop is blocked by mirror holder, form one and detect blind area, may just cannot normally detect at the object being less than in 3cm region, detecting blind area for the diffuse reflection type photoelectric sensor of different size varies in size, but ubiquity, if sensor detects blind area and in use pays no heed to, may cause the omission of detection, some detect the larger sensor application occasion in blind area will be subject to a lot of restrictions, bring very large inconvenience to use.
As shown in Figure 1, wherein 11 is that receiving tube, 12 is that power valve, 13 is that receiver lens, 14 is that diversing lens, 15 is that mirror holder, 16 is that optical filter, 17 is that receiving circuit, 18 is that gain adjustment circuit, 19 is that amplifying circuit, 20 is that filtering circuit, 21 is that logic control circuit, 22 is that radiating circuit, 23 is power supply and output circuit, wherein
1, logic control circuit part: realize the generation that transmits, receive the processing of signal, the functions such as output state control;
2, radiating circuit part: radiating circuit will transmit and carry out electric current amplification, drives power valve, power valve transmitting redness or infrared light pulse;
3, receiving circuit: receiving tube and receiving circuit, the light signal reflecting is converted to current signal, current signal is carried out voltage transitions and amplification by amplifying circuit, regulates the gain of amplifying signal by potentiometer, detects distance to change sensor.
In figure when detecting distance while being less than the position of object 1, the light reflexing on receiving tube will be blocked by the light isolated part in the middle of mirror holder, formation cannot detect the blind area of object, the diffuse reflection type photoelectric sensor of existing scheme all cannot be completely by its elimination, only there are several moneys not there is the sensor that transmits and receives lens, directly will transmit and receive pipe and be close to optical filter, just accomplish zero blind area effect, like this owing to not having lens to assemble, distance can decay a lot, and emission angle is too large, cannot detect small objects, receiving angle is also larger, ambient light interference can directly be introduced.
Shown in Figure 2 again, when target object is during away from sensor, imaging point can move down, as 3 positions in Fig. 2, catoptrical imaging point is too on the lower side, and conductively-closed shadow shield blocks, cannot be imaged onto receiving tube, therefore 3 positions have exceeded sensor sensing range.
Shown in Figure 3 again, in figure, A point is blind area critical point, due to light tight in the middle of mirror holder, when object is during at B point, as catoptrics B, take in the normal angle of lens and can become greatly, and position can on move, imaging point after lens, as the indicated position of figure optics b, has exceeded receiving tube photosensitive region.
In addition, it is more that employing potentiometer carries out distance adjustment drawback: in low profile photovoltaic sensor, as the profile specification diffuse reflection square light electric transducer that is 31*20*11mm, due to limited space, distance adjustment is all to select single-turn potentiometer, degree of regulation is not high, being difficult to will be apart from adjusting very precisely, potentiometer will be placed on the position of being convenient to setting in addition, and sensor amplifier circuit is the position in receiving end signal sensitivity, the position of potentiometer on pcb board separates with discharge circuit, originally shield intact discharge circuit and introduced external interference, shielding design difficulty can increase a lot, and need filtering circuit processing.
In a word, because diffuse reflection type photoelectric sensor is of wide application generally, consumption is huge, need to have higher properties of product and the total solution of low price more, meeting the market requirement.
Utility model content
Adopt fixed sturcture and cause receiving tube not receive the problem of object at the reflected signal of existing blind area for the receiver lens existing in prior art, the purpose of this utility model is to provide a kind of zero blind area diffuse reflection type photoelectric sensor.
For achieving the above object, the utility model adopts following technical scheme:
A kind of zero blind area diffuse reflection type photoelectric sensor, comprise mirror holder, in mirror holder, be provided with receiver lens chamber and diversing lens chamber, in described receiver lens chamber, be provided with support, receiver lens, shielding shadow shield and receiving tube, described receiver lens is located on support, described shielding shadow shield and receiving tube are located at the rear side of receiver lens successively
Described receiver lens is also provided with vertical movement mechanism in chamber, and described vertical movement mechanism is connected with described support;
The aperture of the light hole of described shielding shadow shield is corresponding with the vertical moving range of receiver lens;
Described receiving tube adopts large photosensitive region receiving tube; The axial location of described receiving tube is upper corresponding along position with light hole.
Described vertical movement mechanism comprises that, with externally threaded adjusting screw(rod), the upper end of described support offers through hole, is provided with internal thread in through hole, and described adjusting screw(rod) is connected by screw thread with through hole.
The both sides of described support are respectively equipped with cylindrical small boss, and the madial wall in described receiver lens chamber is provided with the quantity rectangular slide guide hole consistent with cylindrical small boss, and described small boss is located in corresponding slide guide hole.
The quantity of described cylindrical small boss is 4.
The moving range of described vertical movement mechanism is: 0-2.5mm moves up take the dividing plate between described receiver lens chamber and diversing lens chamber as starting point.
The externally threaded quantity of described adjusting screw(rod) is 8, and the moving range of described adjusting screw(rod) is: 0-2.5mm moves up take the dividing plate between described receiver lens chamber and diversing lens chamber as starting point.
Compared with prior art, adopt a kind of zero blind area diffuse reflection type photoelectric sensor of the present utility model to there is following beneficial effect:
1) existing diffuse reflection type photoelectric sensor is to adopt circuit parameter to regulate, realize and detect distance adjustment function, and the utility model has adopted a kind of new implementation, drive receiver lens to move by vertical movement mechanism, the imaging facula receiving is moved, change the ratio of light spot received arrival receiving tube, realize distance adjustment function, mechanical adjustment is that multi-turn regulates simultaneously, improves a lot on degree of regulation;
2) due to the movement of lens in structure, change fixed mode imaging angle, the utility model improves for the light path that forms optics blind area in design, has realized the effect of zero detection blind area.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the diffuse reflection type photoelectric sensor of prior art;
Fig. 2 is receiver lens in Fig. 1 detection schematic diagram in the time detecting the target object of different distance;
Fig. 3 is that the blind area in Fig. 1 forms schematic diagram;
Fig. 4 is the principle schematic of light path part of the present utility model;
Fig. 5 is the structural representation of the support in Fig. 4;
Fig. 6 is the structural representation of the mirror holder in Fig. 1;
Fig. 7 is the detection schematic diagram of receiver lens of the present utility model in the time detecting the target object of different distance;
Fig. 8 is the detection schematic diagram of the target object of receiver lens of the present utility model in the blind area of detecting in Fig. 3.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with drawings and Examples.
Refer to the one zero blind area diffuse reflection type photoelectric sensor shown in Fig. 4, Fig. 5, Fig. 6, comprise mirror holder 31, in mirror holder 31, be provided with receiver lens chamber 32 and diversing lens chamber 33, in receiver lens chamber 32, be provided with support 34, receiver lens 35, shielding shadow shield 36 and receiving tube 37, receiver lens 35 is located on support 34, shielding shadow shield 36 and receiving tube 37 are located at the rear side of receiver lens 35 successively, in receiver lens chamber 32, be also provided with vertical movement mechanism 50, vertical movement mechanism 50 is connected with support 34; Also comprise the optical filter 41 of being located at zero diffuse reflection type photoelectric sensor outer end, blind area, be located at diversing lens 43 and power valve 42 in diversing lens chamber 33;
Vertical movement mechanism 50 for example can adopt such structure, comprises that the inner side of two L-type pin of the upper end of support 34 offers through hole, is provided with internal thread in through hole with 8 externally threaded adjusting screw(rod)s 38, and adjusting screw(rod) 38 is connected by screw thread with through hole.The thread end of adjusting screw(rod) can screw in the thread of through hole inner side, thereby drives receiver lens to move; Adjusting screw(rod) clockwise direction rotation, the lens f that just moves up; Counterclockwise rotation, lens just move down f; It should be noted that, the moving range of receiver lens is: 0-2.5mm moves up take the dividing plate 44 between receiver lens chamber and diversing lens chamber as starting point, when revolving, adjusting screw(rod) 38 turns around, just mobile pitch of receiver lens, the like until be adjusted to the 53(of maximal value place corresponding to 2.5mm place) or the 52(of intermediate value place corresponding to 1.25mm place) or the 51(of minimum value place corresponding to 0mm place).
Like this, can regulate 7.5 circles by adjusting screw(rod) 38, consistent with 270 ° of range of adjustment of potentiometer of the prior art, be equivalent to degree of regulation and improved 10 times, sensor distance is set more reliable, can be applied to and need accurately to set the occasion that detects distance.It should be noted that, in identical vertical moving range, along with the external thread number of adjusting screw(rod) 38 increases, degree of regulation also increases thereupon.
Preferably, the both sides of support 34 are respectively equipped with 2 cylindrical small boss 39, receiver lens chamber madial wall is provided with 4 rectangular slide guide holes 40, small boss is located in corresponding slide guide hole 40, when small boss packs into after slide guide hole, drive receiver lens linear reciprocation to move by turn adjusting screw(rod), thereby realize the function of distance adjustment; Slide guide hole just in time mates with lens small boss, guarantees that lens can not teetertotter and swing when mobile, to guarantee the mobile accuracy of lens.
The aperture of light hole and the vertical moving range of receiver lens 35 of shielding shadow shield 36 are corresponding; Shielding shadow shield 36 is metalwork, and receiving unit circuit is played to electromagnetic shielding action, and in addition, in the utility model, emphasis has utilized its interception.Distance adjustment is achieved as follows: according to geometrical optics lens imaging principle, simulation different objects moves the position of imaging point after lens.
Receiving tube 37 adopts large photosensitive region receiving tube; The axial location of described receiving tube is upper corresponding along position with light hole.
In the time moving on receiver lens 35 positions, imaging point also can be followed on it and move, and coming back to receiving tube can receiving area, and 3 position transducers in Fig. 2 just can detect like this, thereby scioptics regulate and increased detection distance, specifically as shown in Figure 7.
The utility model, for dead zone-eliminating, has 2 differences in design, as described in Figure 8, done 2 improvement, and 1 place in figure moves on the perforate of shielding shadow shield 36 has been carried out; 2 places in figure move on receiving tube position has been carried out, and receiving tube are selected to the device of large photosensitive region.The light that the same like this B position in Fig. 3 reflects also can drop on receiving tube photosensitive region, even if object is again by sensor, imaging point moves up again, in design, also can guarantee to drop in receiving tube region, so just the blind area in former scheme is improved for detectable region, actual test, when object can reliable detection during near sensor optical filter 41.
Visible, the lens adjustment scheme in the utility model could realize such blind area and eliminate improvement, and as shown in Figure 8, the center of receiver lens and the center of receiving tube be not at same level height.And the photoelectric sensor of potentiometer distance adjustment formula of the prior art cannot be designed to the light structure of this zero blind area.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the purpose of this utility model is described, and not with opposing restriction of the present utility model, as long as in essential scope of the present utility model, variation, modification to the above embodiment all will drop in the scope of claim of the present utility model.
Claims (6)
1. a blind area diffuse reflection type photoelectric sensor, comprise mirror holder, in mirror holder, be provided with receiver lens chamber and diversing lens chamber, in described receiver lens chamber, be provided with support, receiver lens, shielding shadow shield and receiving tube, described receiver lens is located on support, described shielding shadow shield and receiving tube are located at the rear side of receiver lens successively, it is characterized in that:
Described receiver lens is also provided with vertical movement mechanism in chamber, and described vertical movement mechanism is connected with described support;
The aperture of the light hole of described shielding shadow shield is corresponding with the vertical moving range of receiver lens;
Described receiving tube adopts large photosensitive region receiving tube; The axial location of described receiving tube is upper corresponding along position with light hole.
2. zero blind area diffuse reflection type photoelectric sensor according to claim 1, is characterized in that:
Described vertical movement mechanism comprises that, with externally threaded adjusting screw(rod), the upper end of described support offers through hole, is provided with internal thread in through hole, and described adjusting screw(rod) is connected by screw thread with through hole.
3. zero blind area diffuse reflection type photoelectric sensor according to claim 2, is characterized in that:
The both sides of described support are respectively equipped with cylindrical small boss, and the madial wall in described receiver lens chamber is provided with the quantity rectangular slide guide hole consistent with cylindrical small boss, and described small boss is located in corresponding slide guide hole.
4. zero blind area diffuse reflection type photoelectric sensor according to claim 3, is characterized in that:
The quantity of described cylindrical small boss is 4.
5. zero blind area diffuse reflection type photoelectric sensor according to claim 1, is characterized in that:
The moving range of described vertical movement mechanism is: 0-2.5mm moves up take the dividing plate between described receiver lens chamber and diversing lens chamber as starting point.
6. zero blind area diffuse reflection type photoelectric sensor according to claim 2, is characterized in that:
The externally threaded quantity of described adjusting screw(rod) is 8, and the moving range of described adjusting screw(rod) is: 0-2.5mm moves up take the dividing plate between described receiver lens chamber and diversing lens chamber as starting point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832886.7U CN203630370U (en) | 2013-12-17 | 2013-12-17 | Zero-blind-area diffuse-reflection-type photoelectric sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320832886.7U CN203630370U (en) | 2013-12-17 | 2013-12-17 | Zero-blind-area diffuse-reflection-type photoelectric sensor |
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| CN203630370U true CN203630370U (en) | 2014-06-04 |
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| CN201320832886.7U Expired - Fee Related CN203630370U (en) | 2013-12-17 | 2013-12-17 | Zero-blind-area diffuse-reflection-type photoelectric sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744122A (en) * | 2013-12-17 | 2014-04-23 | 上海兰宝传感科技股份有限公司 | Zero-blind-spot diffuse reflection type photoelectric sensor |
| CN105897237A (en) * | 2016-05-30 | 2016-08-24 | 宁波星宇极光传感科技有限公司 | Regression reflection photoelectric switch |
| JP2019160664A (en) * | 2018-03-15 | 2019-09-19 | オムロン株式会社 | Small photoelectric sensor |
-
2013
- 2013-12-17 CN CN201320832886.7U patent/CN203630370U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744122A (en) * | 2013-12-17 | 2014-04-23 | 上海兰宝传感科技股份有限公司 | Zero-blind-spot diffuse reflection type photoelectric sensor |
| CN105897237A (en) * | 2016-05-30 | 2016-08-24 | 宁波星宇极光传感科技有限公司 | Regression reflection photoelectric switch |
| CN105897237B (en) * | 2016-05-30 | 2018-11-13 | 星宇电子(宁波)有限公司 | A kind of retroreflecting optoelectronic switch |
| JP2019160664A (en) * | 2018-03-15 | 2019-09-19 | オムロン株式会社 | Small photoelectric sensor |
| JP6991462B2 (en) | 2018-03-15 | 2022-01-12 | オムロン株式会社 | Small photoelectric sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20161217 |