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Reflecting light-sensitive detector
CN2091291U
China
Worldwide applications
1991
CN
Application CN 91207430 events
1991-04-24
1991-04-24
1991-12-25
Status
Withdrawn
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Description
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The utility model relates to a kind of coaxial reflection photo-electric detector.
Existing reflection photo-electric detector, constitute by its light path and can be divided into two kinds of non-coaxial and coaxial types, the light channel structure of non-coaxial photodetector, as shown in Figure 1, Fig. 1 is the light channel structure scheme drawing of non-axis light electric explorer, 1A, 1B are two convex lens among the figure, C is the usable reflection district, because the launch site and the received field disalignment of detecting area, only the overlapping part two fields is the usable reflection district, all the other non-overlapped positions are the blind area, so detection range is restricted; Coaxial reflection photo-electric detector, as shown in Figure 2, Fig. 2 is the light channel structure scheme drawing of axis light electric explorer.2A is convex lens among the figure, 2B is that both are coaxial for pellicle mirror (or pellicle), thereby launch site and received field overwhelming majority overlaid, Gu Youxiaofanshequ increases, but light per pass pellicle mirror (or pellicle) is loss 50%, in theory if disregard the loss of medium conduction loss and reverberation surface reflectivity, light path back and forth at most efficient only can reach 25%, so it is big to plant the light loss consumption of detector, sensitivity is low, therefore surveys active distance and descends.
The purpose of this utility model is to provide a kind of effective search coverage big, the coaxial compound lens reflection photo-electric detector that effective detection range is far away.
The purpose of this utility model is achieved in that detector comprises photocell, light receiving element, optical transmission circuit, optical receiving circuit, it is characterized in that also comprising big convex lens, one little convex lens, mirror heart position at big convex lens is provided with little convex lens 2, two mirrors are positioned on the same axis, and the focus of little convex lens 2 is positioned within the focal length of big convex lens, two focus positions of the same side of above-mentioned two convex lens, a focus position is provided with photocell therein, be provided with light receiving element at another focus position, photocell and optical transmission circuit link, and light receiving element connects with optical receiving circuit; Between photocell and light receiving element, be provided with one and prevent that the direct light of photocell is by the separator of the light that light receiving element received; The diameter D of little convex lens 2
2Diameter D with big convex lens
1Ratio less than 0.707.
The utility model has the advantages that because the detector light path part adopts two big few different convex lens to form coaxial compound lens, therefore reduced the loss of light in transmission course, thereby improved the effective rate of utilization of light, enlarged effective search coverage of detector, increase the effective detection range of detector, also improved detector sensitivity simultaneously.
Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the light channel structure scheme drawing of the photodetector of non-coaxial described in the prior art.
Fig. 2 is the light channel structure scheme drawing of the photodetector of coaxial type described in the prior art.
Fig. 3 is the big convex lens cutaway view of the utility model.
Fig. 4 is the structural representation of embodiment 1 of the present utility model.
Fig. 5 is the structural representation of embodiment 2 of the present utility model.
Fig. 6 is the structural representation of embodiment 3 of the present utility model.
Fig. 7 is the structural representation of embodiment 4 of the present utility model.
Describe CONSTRUCTED SPECIFICATION of the present utility model in detail below in conjunction with accompanying drawing.
Referring to Fig. 3-4, Fig. 4 illustrates first embodiment of the present utility model.As shown in the figure, in detector, be provided with big convex lens 1, little convex lens 2, mirror heart position at big convex lens is provided with a circular hole 8 that can match with little convex lens size, be provided with little convex lens in the hole, the focus of little convex lens 2 is positioned within the focal length of big convex lens 1, promptly between the minute surface of the focus of big convex lens and little convex lens, above-mentioned big or small two convex lens are positioned on the same axis, form a coaxial composite convex lens, focus position at big convex lens 1 is provided with light receiving element 4, two clearance lines of this element 4 directly and optical receiving circuit 7 link, be provided with the radiated element 3 of light at the focus position of little convex lens 2, between photocell 3 and light receiving element 4, be provided with the cage 5 of the light that a direct light that prevents photocell 3 received by light receiving element 4, described cage is provided with in the circular hole 8 at big convex lens mirror heart position, the size of cage makes and can match with circular hole 8 sizes, the one end sealing of this cover, other end opening, above-mentioned photocell 3 just is located in the cover body, focus position at little convex lens 2, the wall that two clearance lines of photocell 3 are passed cover body connects with optical transmission circuit 6, its cover mouth and little convex lens 2 interlockings, above-mentioned cage is to adopt non-light transmissive material to make, for example: metal, aluminum evaporation film.Perhaps on light transmissive material, be coated with the non-transmission substance of one deck, for example japanning, carbon black etc.Described photocell, for example, tungsten filament lamp bubble, light-emitting diode, infrarede emitting diode, visible light emitting diode etc.Described light receiving element, for example: cds photosensitive element cadmium selenide photosensor, silicon photodiode, silicon photodiode, the infrared photodiode of silicon photovoltaic cells etc.
Referring to Fig. 5, Fig. 5 illustrates second embodiment of the present utility model.As shown in the figure, detector institute difference shown in detector shown in the figure and the embodiment one is: in the cage in big convex lens mirror heart position circular hole 8, be provided with the receiving element 4 of light at the focus position of little convex lens 2, the wall that two clearance lines of this element 4 are passed cover body links to each other with optical receiving circuit 7, be provided with photocell 3 at the focus position of big convex lens 1 again, two clearance lines of this element 3 are connected with optical transmission circuit 6, and the structure of remainder is all identical with embodiment 1.
Referring to Fig. 6, Fig. 6 illustrates the 3rd embodiment of the present utility model.As shown in the figure, detector shown in the figure, be provided with a circular hole (not shown) circular hole at the mirror heart position of big convex lens 1 and be embedded with an infrarede emitting diode 3a who has convex lens, the head of this shell itself is exactly little convex lens, two clearance lines and the optical transmission circuit 6 of this diode link, focus position at big convex lens 1 is provided with infrared photodiode 4a, two clearance lines of this pipe are connected with optical receiving circuit 7, on the shell of infrarede emitting diode, scribble the pitch-dark isolation layer of one deck (not comprising case head), make the structure of detector more simple like this as light.
Referring to Fig. 7, Fig. 7 illustrates the 4th embodiment of the present utility model.As shown in the figure, detector shown in the figure, mirror heart position at big convex lens is provided with a circular hole (not shown), this circular hole is embedded with an infrared photodiode that has convex lens, this case head itself is exactly little convex lens, and two clearance lines and the optical receiving circuit 7 of this diode link, and are provided with infrarede emitting diode at the focus position of big convex lens, the clearance line of this diode and optical transmission circuit 6 join, and all the other structures are identical with the 3rd embodiment.Coaxial composite convex lens best mode described in the detector is to adopt the one-time formed coaxial composite convex lens of plastic optics technology.The diameter D of described little convex lens 2
2Diameter D with big convex lens 1
1Ratio less than 0.707.
Application example utilizes detector shown in Figure 6, and the infrared ray of being launched by infrarede emitting diode runs into measured object, turn back through its reflection, converge on the infrared photodiode by big convex lens, obtain the light signal, provide the usefulness of electric signal for automatic guidance through receiving amplifying circuit.
The utility model is applicable to transport tape, and judgment object has or not on the conveyor line, puts location, customized cut-off, counting etc. in place.
Claims (8)
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Claims (8)
Hide Dependent
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1, a kind of reflection photo-electric detector, comprise photocell (3), light receiving element (4), optical transmission circuit (6), optical receiving circuit (7), it is characterized in that also comprising big convex lens (1), little convex lens (2), mirror heart position at big convex lens (1) is provided with little convex lens (2), two mirrors are positioned on the same axis, the focus of little convex lens (2) is positioned within the focal length of big convex lens (1), two focus positions of above-mentioned two convex lens are in the same side, and a focus position is provided with photocell (3) therein, are provided with light receiving element (4) at another focus position, photocell (3) links with optical transmission circuit (6), and light receiving element (4) connects with optical receiving circuit (7); Between photocell (3) and light receiving element (4), be provided with the separator (5) of the light that a direct light that prevents photocell (3) received by light receiving element (4); The diameter D of little convex lens (2)
2Diameter D with big convex lens 1
1Ratio be less than 0.707.
2, detector according to claim 1 is characterized in that the mirror heart position of described big convex lens (1) is provided with a circular hole (8), is provided with separator (5) in the circular hole (8).
3, detector according to claim 1 is characterized in that described separator (5) is a cage or an isolation layer.
4, according to claim 1,3 described detectors, it is characterized in that the end sealing of described cage, other end opening, the focus position of the inherent little convex lens of cover body (2) is provided with photocell (3), the wall that two clearance lines of this element (3) are passed cover body connects with optical transmission circuit (6), this cover mouth and little convex lens (2) interlocking.
5, according to claim 1,4 described detectors, it is characterized in that being provided with light receiving element (4) in the body of described cage (5), wall and optical receiving circuit (7) that two clearance lines of this element (4) are passed cover body link.
6, detector according to claim 1, the mirror heart position that it is characterized in that described big convex lens (1) is provided with a circular hole, circular hole is embedded with an infrarede emitting diode that has convex lens, this case head is exactly little convex lens, and two clearance lines and the optical transmission circuit 6 of this pipe link.
7, detector according to claim 1, the mirror heart position that it is characterized in that described big convex lens 1 is provided with a circular hole, its circular hole is embedded with an infrared photodiode that has convex lens, this case head is exactly little convex lens, and two clearance lines and the optical receiving circuit 7 of this diode link.
8, detector according to claim 1 is characterized in that described coaxial composite convex lens is to adopt the one-time formed coaxial composite convex lens of plastic optics technology.