CN101078771A - Optical distance measuring device and manufacturing method therefor - Google Patents
Optical distance measuring device and manufacturing method therefor Download PDFInfo
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- CN101078771A CN101078771A CN 200710105195 CN200710105195A CN101078771A CN 101078771 A CN101078771 A CN 101078771A CN 200710105195 CN200710105195 CN 200710105195 CN 200710105195 A CN200710105195 A CN 200710105195A CN 101078771 A CN101078771 A CN 101078771A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 177
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Abstract
The present invention provides an optical distance measuring device and manufacturing method therefor. In the optical distance measuring device of the invention, a second optical path is formed by a transparent resin formed in a region where a light emitting element and a second light receiving part are connected directly to each other. As the temperature increases, the length of the optical path increases while its refractive index decreases, so that the optical path length itself becomes generally constant. Therefore, the length of the second optical path can be kept generally constant independently of temperature. Further, a first light receiving part for a first optical path and a second light receiving part for the second optical path 18 are formed in one identical light receiving element. Therefore, characteristic variations of the first light receiving part and the second light receiving part due to temperature can be reduced. This optical distance measuring device can achieve high distance measuring accuracy even under environments of intense temperature changes.
Description
Technical field
The present invention relates to optical distance measuring apparatus with and manufacture method, this optical distance measuring apparatus is measured the distance apart from above-mentioned range finding object based on making the found range object reflection and arrive first light path of photo detector and make the light that penetrates from light-emitting component arrive these two light paths of second light path of photo detector of the light that penetrates from light-emitting component.
Background technology
In the past, as distance-finding method, common general knowledge be measure the two-way time of light and calculate method apart from the distance of determination object, be so-called TOF (Time Of Flight) method.This distance-finding method is following to carry out: because well-known light velocity c is 3.0 * 10
8M/s is so by measuring its two-way time of t1, the formula (1) below utilizing is calculated the distance L apart from object.
L＝(c·t1)/2...(1)
Concrete signal disposal route in the above-mentioned TOF method has following various motion: it is disclosed apart from measuring device that for example (Japan) spy opens flat 6-18665 communique (document 1), to begin pulse (synchronous) signal to start with light-emitting component, on integrator, continue accumulation (perhaps discharge) electric charge, finish pulse (being subjected to light signal) until detecting, detect the two-way time of light by its increase (or minimizing) amount.Like this, as the assay method of measuring the time between above-mentioned beginning pulse and the end pulse, has following method etc., for example (Japan) spy opens the disclosed Distnace determination device of flat 7-294642 communique (document 2), begin simultaneously the umber of pulse of benchmark CLK is counted with the beginning pulse, based on detect beginning during pulse umber of pulse and obtain two-way time of light.
These methods all are to obtain range information to handling from the detection signal of the photo detector that detects the light that is reflected by the range finding object.At this moment, because the characteristic variations of the fluctuation of the answer speed of the fluctuation of the answer speed of above-mentioned light-emitting component, above-mentioned photo detector, above-mentioned two elements that environment (mainly the being temperature) influence of etc.ing causes etc. are understood the generation error on range information.
Therefore, in order to reduce above-mentioned such error, first light path that use will be detected by photo detector by above-mentioned range finding object reflection from the light that above-mentioned light-emitting component penetrates and the light that penetrates from above-mentioned light-emitting component are by above-mentioned photo detector second light paths that detect, different with above-mentioned first light path, if the length of above-mentioned second light path is known and is certain, can be the range information that N Reference Alignment is calculated based on above-mentioned first light path with above-mentioned second light path then.Therefore, proposition has the disclosed Distnace determination device of No. 3225682 communique of (Japan) patent (document 3), (Japan) spy to drive the various distance measuring equipments of above-mentioned second light paths of use such as light wave distance meter of the disclosed Distnace determination device of 2002-286844 communique (document 4), the disclosed pulse mode of No. 2896782 communique of (Japan) patent (document 5).
But, in above-mentioned document 3～document 5 disclosed existing distance measuring equipments, have following problem.
Promptly, above-mentioned second light path is under the situation of above-mentioned document 3 disclosed Distnace determination devices, form by reflection border or prism, under the situation of above-mentioned document 4 disclosed Distnace determination devices, form, under the situation of the light wave distance meter of above-mentioned document 5 disclosed pulse modes, form by optical fiber by light guide member.
As mentioned above, in order to proofread and correct the range information of calculating, importantly make the length of above-mentioned second light path always certain based on above-mentioned first light path.Usually, if temperature rises, then the length of light path is because thermal expansion and elongated.But, in above-mentioned document 3～document 5 disclosed existing distance measuring equipments, do not mention fully for the thermal expansion of above-mentioned second light path.In addition, because the optical element that above-mentioned second optical routing separates constitutes, it is big that Distnace determination device becomes, and becomes unsuitable structure when being used for electronic equipment.
Summary of the invention
Therefore, though problem of the present invention provide a kind of compact optical formula distance measuring equipment that under the very big environment of temperature variation, also can access high distance accuracy with and manufacture method.
In order to solve above-mentioned problem, optical distance measuring apparatus of the present invention comprises: light-emitting component; Photo detector, it is accepted from the light of above-mentioned light-emitting component ejaculation; First optical system, it is used to form and makes the light that penetrates from above-mentioned light-emitting component be found range the object reflection and arrive first light path of above-mentioned photo detector; Second optical system, it is used to form and makes second light path that is not arrived above-mentioned photo detector from the light of above-mentioned light-emitting component ejaculation by above-mentioned range finding object reflectingly; The range information calculation mechanism, the signal that its light time of having passed through above-mentioned first light path based on acceptance exported from above-mentioned photo detector from the light time that above-mentioned second light path has been passed through in the signal and the acceptance of above-mentioned photo detector ejaculation, obtain range information apart from above-mentioned range finding object, above-mentioned second optical system has transparent resin, and a part of photoconduction that its light accepting part with the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector directly contacts and will penetrate from above-mentioned illuminating part is to above-mentioned light accepting part.
Optical path length is the product of the length and the refractive index of light path, is under the situation of transparent resin in light path, and the length of light path increases if temperature rises then, but the refractive index of light path descends.Therefore, optical path length self is roughly certain.According to above-mentioned formation, second optical system that forms second light path contain the illuminating part of direct touch luminous element and photo detector light accepting part transparent resin and constitute.Therefore, above-mentioned second light path that is formed by above-mentioned transparent resin is temperature dependent and make length roughly certain not, the temperature error of the range information that obtains can be reduced.
In addition, in the optical distance measuring apparatus of above-mentioned first aspect, the light accepting part of above-mentioned photo detector has a plurality of, and, part in above-mentioned a plurality of light accepting part and above-mentioned first optical system are coupled optically, and other light accepting parts and above-mentioned second optical system are coupled optically.
According to this aspect, the light accepting part that is coupled optically with above-mentioned first optical system and be arranged on the same photo detector with light accepting part that above-mentioned second optical system is coupled optically.Therefore, with the light accepting part that is coupled optically with above-mentioned first optical system with compare with the situation that light accepting part that above-mentioned second optical system is coupled optically is arranged on the different photo detectors, the temperature fluctuation of the characteristic of each light accepting part reduces.Its result can further reduce the temperature error of the range information that obtains.In addition, compare, can seek the miniaturization of this optical distance measuring apparatus with the situation of using a plurality of above-mentioned photo detectors.
In addition, in the optical distance measuring apparatus of first aspect, also comprise second lens that first lens that light-emitting component is used and photo detector are used, it constitutes above-mentioned first optical system and is formed by transparent resin on above-mentioned light-proofness resin; First transparent resin, it constitutes above-mentioned first optical system and directly contacts above-mentioned light-emitting component; Second transparent resin, it constitutes above-mentioned first optical system and directly contacts above-mentioned photo detector; Two eyelets, its be arranged on above-mentioned first lens of above-mentioned light-proofness resin and above-mentioned second lens under, above-mentioned first lens directly contact via being arranged on the above-mentioned eyelet on the above-mentioned light-proofness resin with first transparent resin, and above-mentioned second lens directly contact via being arranged on above-mentioned another eyelet on the above-mentioned light-proofness resin with second transparent resin.
According to this aspect, first lens that above-mentioned light-emitting component is used directly contact with first lenticular resins that directly contacts above-mentioned light-emitting component, and second lens that photo detector is used directly contact with second transparent resin that directly contacts above-mentioned photo detector.Therefore, can make between above-mentioned first lens and the above-mentioned light-emitting component and between above-mentioned second lens and the above-mentioned photo detector and do not have air layer.Like this, can reduce the reflection of light that produces on border with air layer.
In addition, in the optical distance measuring apparatus of first aspect, above-mentioned light-emitting component is a light emitting diode.
According to this aspect, the half value of the directive property of above-mentioned light emitting diode is the wide of 60 degree.Therefore, penetrate and do not inject the light interreflection of above-mentioned first optical system that forms above-mentioned first light path and be injected into above-mentioned second optical system that forms above-mentioned second light path from the illuminating part of above-mentioned light-emitting component, and be directed to the light accepting part of above-mentioned photo detector.
In addition, in the optical distance measuring apparatus of first aspect, above-mentioned light-emitting component is a surface-emitting type semiconductor laser, and the part that directly contacts with illuminating part above-mentioned light-emitting component above-mentioned transparent resin that constitutes above-mentioned second optical system is the scattering transparent resin.
The half value of the directive property of above-mentioned face lighting type semiconductor laser is the narrow of 15 degree.Therefore, penetrate and the light that is not injected into above-mentioned first optical system that forms above-mentioned first light path is not injected into above-mentioned second optical system that forms above-mentioned second light path from the illuminating part of above-mentioned light-emitting component.According to this aspect, making the part of illuminating part of the above-mentioned light-emitting component of direct contact of above-mentioned transparent resin is the scattering transparent resin.Therefore, the light of not injecting above-mentioned first optical system is spread by above-mentioned scattering transparent resin, and its part is injected the light accepting part that is directed to above-mentioned photo detector after above-mentioned second optical system.
In addition, the manufacture method of the optical distance measuring apparatus of this invention is the manufacture method with optical distance measuring apparatus of above-mentioned light-proofness resin, the above-mentioned transparent resin that constitutes above-mentioned second optical system forms by cast, and above-mentioned light-proofness resin forms by casting mold or transfer molding.
According to above-mentioned formation, above-mentioned second optical system that forms above-mentioned second light path is discharged above-mentioned needle point to be moved and above-mentioned transparent resin wire ground drawn from the needle point of divider etc. by on one side that stickiness is high above-mentioned transparent resin and is formed on one side.In addition, above-mentioned light-proofness resin can form by casting mold or transfer molding after above-mentioned cast.
In addition, in the manufacture method of the optical distance measuring apparatus of first aspect, the light accepting part of above-mentioned photo detector exists a plurality of, and the part in a plurality of light accepting parts and above-mentioned first optical system are coupled optically, other light accepting part portions and above-mentioned second optical system are coupled optically, and the light accepting part that is coupled optically of the light accepting part that is coupled optically of above-mentioned first optical system and above-mentioned second optical system between make the intransitable wall of above-mentioned transparent resin when being provided with in above-mentioned cast.
According to this aspect, when passing through the above-mentioned transparent resin of above-mentioned second optical system of cast formation formation, the above-mentioned transparent resin of pouring into a mould on the light accepting part that above-mentioned second light path is used is blocked by above-mentioned wall and is prevented that it from directly contacting the light accepting part that above-mentioned first light path is used.Therefore, using under the situation of small-sized photo detector in order to make compact optical formula distance measuring equipment, can be with above-mentioned second optical system from above-mentioned first optical system optical fractionation reliably.
In addition, in the optical distance measuring apparatus of first aspect, the both ends that constitute the above-mentioned transparent resin of above-mentioned second optical system constitute the optical coupled portion that directly contacts with the light accepting part of the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector and be coupled optically with above-mentioned illuminating part and above-mentioned light accepting part, the both ends of the transparent path that constitutes between the coupling part of above-mentioned two optics are relative with above-mentioned illuminating part and above-mentioned light accepting part via above-mentioned optical coupled portion, surrounded by above-mentioned light-proofness resin around the above-mentioned transparent path.
According to this aspect, constitute above-mentioned second optical system by the transparent path that is surrounded by above-mentioned light-proofness resin and the both sides that are positioned at this transparent path and the optical coupled portion that is coupled optically with above-mentioned illuminating part and above-mentioned light accepting part when the light accepting part with the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector directly contact on every side, this second optical system formation makes above-mentioned second light path that reaches above-mentioned photo detector from the light of above-mentioned light-emitting component ejaculation.The both ends of above-mentioned transparent path are relative with above-mentioned illuminating part and above-mentioned light accepting part via above-mentioned optical coupled portion.Therefore, can prevent to inject the end face of above-mentioned photo detector by the light after above-mentioned second light path.In addition, by with surrounding by above-mentioned light-proofness resin around the above-mentioned transparent path, can suppress unnecessary light leak in above-mentioned second light path.Like this, can improve coupling efficiency.
In addition, in the optical distance measuring apparatus of first aspect, the above-mentioned transparent path of above-mentioned transparent resin has semicircular section shape, and above-mentioned light-proofness resin contains the reflective material and constitutes.
According to this aspect, form the semicircular while at section shape, will surround above-mentioned light-proofness resin around the above-mentioned transparent path and contain the reflective material and constitute above-mentioned transparent path.Therefore, become the state of placing catoptron at the straight line portion of semi-circular shape, can regard optically structural equivalents as with the transparent path of imbedding circular section.Therefore, can similarly reduce light with optical fiber and transmit loss.
In addition, the manufacture method of optical distance measuring apparatus of the present invention forms the above-mentioned light-proofness resin that the surface has the band step groove of two-layer structure, this two-layer structure is from constituting step-like near the section shape above-mentioned photo detector near the above-mentioned light-emitting component, the above-mentioned transparent resin of cast in the ground floor groove of the above-mentioned band step groove of above-mentioned light-proofness resin surface setting and after solidifying, cast above-mentioned light-proofness resin and solidifying in the second layer groove of above-mentioned band step groove, thus, form the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin on every side.
According to above-mentioned formation, in the ground floor groove of the above-mentioned band step groove of above-mentioned light-proofness resin surface setting, form above-mentioned transparent resin by cast, in second layer groove, form above-mentioned light-proofness resin, therefore can above-mentioned transparent path easily be imbedded in the above-mentioned light-proofness resin by cast by cast.
In addition, the manufacture method of optical distance measuring apparatus of the present invention form near the above-mentioned light-emitting component near the above-mentioned light-proofness resin that is provided with groove the above-mentioned photo detector from the teeth outwards, above-mentioned transparent resin is poured into the degree of depth midway in the above-mentioned groove of above-mentioned light-proofness resin surface setting and solidifies, then, the substrate that will be formed with above-mentioned light-proofness resin and above-mentioned transparent resin is arranged in the mould, inject above-mentioned light-proofness resin and transfer molding on the above-mentioned transparent resin in above-mentioned groove, the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin around forming thus.
According to above-mentioned formation, by the above-mentioned transparent resin of cast formation up to the degree of depth midway of the groove that is provided with at above-mentioned light-proofness resin surface, and then on its transparent resin, form above-mentioned light-proofness resin by transfer molding, therefore with by being cast in the situation that forms above-mentioned light-proofness resin in the above-mentioned groove compare, can by the above-mentioned light-proofness resin with identical optical characteristics will above-mentioned transparent path around surround, and the light that can further reduce above-mentioned transparent path transmits loss.
In addition, the manufacture method of optical distance measuring apparatus of the present invention, formation near the above-mentioned light-emitting component near the above-mentioned light-proofness resin that is provided with groove the above-mentioned photo detector from the teeth outwards, the substrate that will be formed with above-mentioned light-proofness resin is arranged in first mould and above-mentioned transparent resin is injected into the degree of depth midway in the above-mentioned groove that above-mentioned light-proofness resin surface is provided with and transfer molding, the aforesaid substrate that will be formed with above-mentioned transparent resin is arranged in second mould and above-mentioned light-proofness is injected on the above-mentioned transparent resin in the above-mentioned groove and transfer molding the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin around forming thus.
According to above-mentioned formation, by the above-mentioned transparent resin of transfer molding formation up to the degree of depth midway of the groove that is provided with at above-mentioned light-proofness resin surface, and then on above-mentioned transparent resin, form above-mentioned light-proofness resin by transfer molding, therefore can above-mentioned transparent path promptly be embedded in the above-mentioned light-proofness resin by transfer molding.In addition, can by the above-mentioned light-proofness resin with identical optical characteristics will above-mentioned transparent path around surround, and the light that can further reduce above-mentioned transparent path transmits loss.
As known from the above, optical distance measuring apparatus of the present invention, formation makes second optical system that is not arrived second light path of photo detector from the light of light-emitting component ejaculation by the range finding object reflectingly, comprise the transparent resin that directly contacts with the light accepting part of the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector, so even temperature rises, the length of above-mentioned second light path increases, the refractive index of above-mentioned second light path is reduced and make with the optical path length of the product representation of optical path length and light path refractive index roughly certain.Therefore, the optical path length of above-mentioned second light path is temperature dependent and roughly certain not, even also can access high distance accuracy under the very big environment of temperature variation.
In addition, if the light accepting part of a plurality of above-mentioned photo detectors is set, and make that a part and above-mentioned first optical system in a plurality of light accepting parts is coupled optically, another part light accepting part and above-mentioned second optical system be coupled optically, with the light accepting part that will be coupled optically with above-mentioned first optical system with compare with the situation that light accepting part that above-mentioned second optical system is coupled optically is arranged on the different photo detectors, can reduce the temperature fluctuation of each light accepting part characteristic.Therefore, can further reduce the temperature error of the range information that obtains.In addition, compare, can seek the miniaturization of this optical distance measuring apparatus with the situation of using a plurality of above-mentioned photo detectors.
In addition, by the transparent path that is surrounded by above-mentioned light-proofness resin on every side be positioned at these transparent path both sides and constitute above-mentioned second optical system with optical coupled portion that the light accepting part of the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector is coupled optically, this second optical system forms and makes above-mentioned second light path that is not arrived above-mentioned photo detector from the light of above-mentioned light-emitting component ejaculation by above-mentioned range finding object reflectingly, and, the both ends of above-mentioned transparent path are relative with above-mentioned illuminating part and above-mentioned light accepting part via above-mentioned optical coupled portion, can prevent to be injected into the end face of above-mentioned photo detector thus by the light after above-mentioned second light path.In addition, by surround by above-mentioned light-proofness resin above-mentioned transparent path around, can suppress unnecessary light leak in above-mentioned second light path.That is, can improve coupling efficiency.
In addition, the manufacture method of optical distance measuring apparatus of the present invention is owing to form the above-mentioned transparent resin of above-mentioned second optical system of formation by cast, so by on one side discharging the high above-mentioned transparent resin of stickiness above-mentioned needle point is moved, above-mentioned transparent resin can be formed wire along above-mentioned second light path from the needle point of divider etc.In addition, owing to form above-mentioned light-proofness resin by casting mold or transfer molding, so can after above-mentioned cast, form.
In addition, form above-mentioned transparent resin in the ground floor groove of the band step groove that the manufacture method of optical distance measuring apparatus of the present invention is provided with by the surface that is cast in above-mentioned light-proofness resin, in second layer groove, form above-mentioned light-proofness resin, so can above-mentioned transparent path easily be embedded in the above-mentioned light-proofness resin by cast by cast.
In addition, above-mentioned light-proofness resin is formed on the above-mentioned transparent resin of the groove inner underside formation of being located at above-mentioned light-proofness resin surface, if form above-mentioned light-proofness resin by transfer molding, then with by being cast in the situation that forms above-mentioned light-proofness resin in the above-mentioned groove compare, can by the above-mentioned light-proofness resin with identical optical characteristics will above-mentioned transparent path around surround, and the light that can further reduce above-mentioned transparent path transmits loss.
Description of drawings
The present invention can fully understand by following detailed description and accompanying drawing.Accompanying drawing only is used for explanation, does not limit the present invention.
Fig. 1 is the planimetric map of optical distance measuring apparatus of the present invention.
Fig. 2 is the outboard profile of optical distance measuring apparatus shown in Figure 1.
Fig. 3 is the state behind the radome is taken off in expression from Fig. 1 figure.
Fig. 4 is the state behind the radome is taken off in expression from Fig. 2 figure.
Fig. 5 is the figure of state that expression makes the light-proofness resin transparent of Fig. 3.
Fig. 6 is that the A-A ' of Fig. 5 is to pseudosection.
Fig. 7 is the figure of the position relation of expression range finding object and optical distance measuring apparatus.
Fig. 8 A, Fig. 8 B are the key diagrams of the manufacture method of optical distance measuring apparatus shown in Figure 1.
Fig. 9 A, Fig. 9 B are the key diagrams of the manufacture method after Fig. 8 A, the 8B.
Figure 10 is the key diagram of the manufacture method after Fig. 9 A, Fig. 9 B.
Figure 11 A, Figure 11 B are the key diagrams of the manufacture method after Figure 10.
Figure 12 is the key diagram of the manufacture method after Figure 11 A, Figure 11 B.
Figure 13 A, Figure 13 B are the figure that is illustrated in the state that is formed with first lens and second lens on the printed base plate.
Figure 14 A, Figure 14 B are illustrated in the figure that is formed with the state of wall between first light accepting part on the photo detector and second light accepting part.
Figure 15 is the planimetric map of the optical distance measuring apparatus different with Fig. 1.
Figure 16 is that the G-G ' of Figure 15 is to pseudosection.
Figure 17 is that expression is taken off radome and made the figure of the state of light-proofness resin transparent from the optical distance measuring apparatus different with Fig. 1.
Figure 18 is that the H-H ' of Figure 17 is to pseudosection.
Figure 19 figure that to be expression range finding object concern with the position of optical distance measuring apparatus shown in Figure 17.
Figure 20 A, Figure 20 B are the key diagrams of the manufacture method of optical distance measuring apparatus shown in Figure 17.
Figure 21 is the key diagram of the manufacture method after Figure 20 A, the 20B.
Figure 22 A, Figure 22 B are illustrated in the figure that is formed with flat light-proofness state of resin on the printed base plate.
Figure 25 A, Figure 25 B are that the K-K ' of Figure 22 A, 22B is to pseudosection.
Figure 24 A, Figure 24 B are the key diagrams of the manufacture method after Figure 21.
Figure 25 A, Figure 25 B are the key diagrams of the manufacture method after Figure 24 A, the 24B.
Figure 26 A, Figure 26 B are that N-N ' among Figure 25 A, the 25B is to pseudosection.
Figure 27 is the key diagram of the manufacture method after Figure 25 A, the 25B.
Figure 28 is the key diagram of the manufacture method different with Figure 25 A, 25B after Figure 24 A, the 24B.
Figure 29 A, Figure 29 B are the figure that expression is embedded to transparent path by transfer molding the state in the flat light-proofness resin.
Embodiment
Below, describe the present invention in detail by illustrated embodiment.
First embodiment
Fig. 1 is the planimetric map of the optical distance measuring apparatus 1 of present embodiment.In addition, Fig. 2 is the outboard profile of optical distance measuring apparatus 1 shown in Figure 1.In addition, this optical distance measuring apparatus 1 use first light path that the light that will penetrate from light-emitting component detects by the reflection of range finding object and by photo detector and the light that will penetrate from above-mentioned light-emitting component not by above-mentioned range finding object reflectingly by second light path of above-mentioned photo detector detection, especially, be applicable to non-contact switch that the Special Automatic machinery that need to detect barrier or mechanical contact are little or non-contact control compact optical formula distance measuring equipment with electronic equipments such as equipment.
This optical distance measuring apparatus 1 has for making from the electrical Interference of outside does not inject the structure that cover by radome 2 inside.In addition, this radome 2 is bent and constitute the dividing plate 6 of emission side and sensitive side to printed base plate (PWB) 5 lateral bendings between second lens 4 that first lens 3 that illuminating part is used and light accepting part are used.And, carry out shading by 6 pairs of light that between two lens 3,4, directly pass through of this dividing plate.
Fig. 3 is the figure of the state after expression is taken off radome 2 from Fig. 1, and Fig. 4 is the figure of the state after expression is taken off radome 2 from Fig. 2.In Fig. 3 and Fig. 4, expression can be seen for example state of the light-proofness resin 7 of black by the transparent resin that constitutes first lens 3 and second lens 4 etc.In addition, dispose a plurality of electrodes 9 side by side, supply with the electric power of driving circuit and take out range information to the outside from this electrode 9 in the side of printed base plate 5.
Fig. 5 represents to make for convenience of explanation the transparent situation of the above-mentioned light-proofness resin 7 of Fig. 3.Fig. 6 is that the A-A ' of Fig. 5 is to pseudosection.This optical distance measuring apparatus 1 small pieces be engaged in light-emitting component on the printed base plate 5 (LED: light emitting diode) 10 and photo detector (PD: photodiode) cover on 11 the transparent resin 8,8 that constitutes by silicones etc. ', and then, on it, cover the light-proofness resin 7 that constitutes by epoxy resin etc., and on it, cover the transparent resins such as epoxy resin that form first, second lens.
On above-mentioned photo detector 11, be formed with two light accepting parts that first light accepting part 12 and second light accepting part 13 constitute.And on printed base plate 5, light-emitting component 10 and second light accepting part 13 are by transparent resin 8,8 ' and directly be connected.
Fig. 7 represent to find range position relation of object 15 and this optical distance measuring apparatus 1.The light that penetrates from light-emitting component 10 has the directive property of half value half-angle 60 degree, the light that penetrates towards the front is by transparent resins such as silicones 8, and eyelet 14 by light-proofness resin 7, by first lens 3 that form by transparent resins such as epoxy resin, become the light of almost parallel and inject the range finding object 15.And, the light of injecting range finding object 15 is reflected to the four directions by range finding object 15, also pass through the eyelet 16 of light-proofness resin 7 in its reflected light by second lens 4 that form by transparent resins such as epoxy resin towards a part of light of optical distance measuring apparatus 1, by transparent resins such as silicones 8, inject first light accepting part 12 of photo detector 11.Below, this light path is called first light path 17.
On the other hand, the light that for example points to from the light that above-mentioned light-emitting component 10 penetrates more than 30 degree of angle can not be by the eyelet 14 of light-proofness resin 7 by 7 reflections of light-proofness resin.And, the transparent resins such as silicones 8,8 by light-emitting component 10 and photo detector 11 directly linked to each other ' and to injecting with another second light accepting part 13 that first light accepting part of accepting from the light of first light path 17 12 separates optically.Below, this light path is called second light path 18.
Like this, inject the first different light accepting part 12 of above-mentioned photo detector 11 and the light of second light accepting part 13 and be transformed into electric current, handle, obtain apart from the range information of range finding object 15 by the circuit (not shown) that monolithic on photo detector 11 forms.At this moment, the fluctuation of the answer speed of light-emitting component 10, the influences such as (mainly being temperature) of the fluctuation of the answer speed of photo detector 11 and environment and the light-emitting component 10 that causes and the characteristic variations of photo detector 11 by foregoing circuit, are that benchmark is proofreaied and correct with the length of second light path 18.
That is, in the present embodiment, above-mentioned first optical system is made of the eyelet 16 and the transparent resin 8 of the eyelet 14 of above-mentioned transparent resin 8, light-proofness resin 7, first lens 3, second lens 4, light-proofness resin 7.In addition, above-mentioned second light system is by transparent resin 8, light-proofness resin 7 and transparent resin 8 ' constitute.
As mentioned above, in this optical distance measuring apparatus 1, be formed on second light path 18 on the printed base plate 5 and be formed on will light-emitting component 10 and the zones that directly connect of second light accepting part 13 on form transparent resin 8,8 ' in.Usually, optical path length is the product of the refractive index of the length of light path and light path, and under the situation that is transparent resin, the length of light path increases if temperature rises then, but since refractive index descend, so have the roughly certain character of optical path length self.Therefore, second light path 18 of transparent resin 8, the 8 ' middle formation that directly contacts at second light accepting part 13 with light-emitting component 10 and photo detector 11 does not rely on temperature and can keep roughly certain length.
In addition, first light accepting part 12 of above-mentioned first light path, 17 usefulness and second light accepting part 13 of second light path, 18 usefulness are formed in the same photo detector 11.Therefore, and first light accepting part is compared with the situation that second light accepting part is formed on different photo detectors, can be reduced the temperature fluctuation of the characteristic of the characteristic of first light accepting part 12 and second light accepting part 13.Therefore, can reduce the error of the range information that the temperature fluctuation by the characteristic of the characteristic of first light accepting part 12 and second light accepting part 13 causes.In addition, compare, can seek the miniaturization of optical distance measuring apparatus 1 with the situation of using a plurality of photo detectors.
In addition, above-mentioned second light path 18 is separated with above-mentioned first light path 7 optically by light-proofness resin 7.Therefore, there is not mutual interference mutually between above-mentioned first light path 17 and second light path 18.Therefore, need not to be provided with the switch etc. that light path is switched usefulness.
Below, the manufacture method of this optical distance measuring apparatus 1 is described based on Fig. 8～Figure 14.
Fig. 8 A is the planimetric map of above-mentioned printed base plate 5.Fig. 8 B is that the B-B ' of Fig. 8 A is to pseudosection.Shown in Fig. 8 A, Fig. 8 B, at first on the surface of printed base plate 5, engage semi-conductor chips such as light-emitting component 10 and photo detector 11 by conductive adhesive small pieces such as silver paste.Then, engage and be electrically connected by the welding disk and the enterprising line lead of welding disk of printed base plate 5 on light-emitting component 10 and photo detector 11 such as gold thread.
Then, shown in Fig. 9 A, Fig. 9 B, by divider 21 with transparent resins such as silicones 8,8 ' be cast in assigned position.At this moment, on one side by on one side discharging the high transparent resin 8 of stickiness ' above-mentioned needle point is moved from the needle point of divider 21, can be with transparent resin 8 ' along second light path, 18 formation wire.For the transparent resin 8,8 that prevents to be poured into a mould ' because gravity or vibration and expand from assigned position, as transparent resin 8,8 ', use the ultraviolet hardening transparent resin, irradiation ultraviolet radiation after cast and after the semi-solid preparation is thoroughly solidified by dryer and to get final product.In addition, the coating amount of casting resin is by divider 21 controls, and is in the operation afterwards, more in the part coating that becomes eyelet 14,16 of light-proofness resin 7.In addition, Fig. 9 B is that the C-C ' of Fig. 9 A is to pseudosection.
Then, above-mentioned transparent resin 8,8 ' on form light-proofness resin 7.Figure 10 is illustrated in the longitudinal diagram that disposes the state of printed base plate 5 in the mould 22,23 that is used to form light-proofness resin 7.Under this state, the part of the transparent resin 8 that links to each other with first light path 17 is pushed by mould 22 and is become the plane, becomes the part of eyelet 14,16 afterwards.And, be infused in the light-proofness resin that has mixed the light absorptive adjuvant in the epoxy resin and transfer molding obtains flat light-proofness resin 7 to the space that forms by printed base plate 5 and mould 22.In addition, use transfer molding in the present embodiment, but also can use casting mold.
Figure 11 A, 11B are illustrated in the state that is formed with flat light-proofness resin 7 on the above-mentioned printed base plate 5.Be formed with eyelet 14,16 at the light-emitting component 10 of light-proofness resin 7 and the top of photo detector 11.In addition, Figure 11 B is that the D-D ' of Figure 11 A is to pseudosection.
Figure 12 is illustrated in the longitudinal diagram that disposes the state of printed base plate 5 in the mould 24,25 that is used to form above-mentioned first, second lens 3,4.Forming transparent resin such as injection ring epoxy resins in the space by printed base plate 5 and mould 24 and transfer molding forms first, second lens 3,4.Figure 13 A, 13B represent to be formed with on printed base plate 5 by transparent resin the state of first lens 3 and second lens 4.In addition, Figure 13 B is that the E-E ' of Figure 13 A is to pseudosection.
If the size of above-mentioned photo detector 11 reduces, then the distance of first light accepting part 12 and second light accepting part 13 must shorten.And, when carrying out cast operation shown in Figure 9, first light accepting part 12 that links to each other with first light path 17 and second light accepting part 13 that links to each other with second light path 18 the two may be by identical transparent resin covering.At this moment, shown in Figure 14 A, 14B, between first light accepting part 12 on the photo detector 11 and second light accepting part 13, be formed for the wall 26 of transparent resin 8,8 ' block that will cast.This wall 26 forms by serigraphy etc. when printed base plate 5 becomes wafer state.By forming such wall 26, with the transparent resin 8,8 of cast ' block, prevent first light accepting part 12 and second light accepting part 13 the two by identical transparent resin 8 or identical transparent resin 8 ' covering.In addition, form the technology of wall 26, the technology of glass plate being installed as on CCD (electric lotus root element), clipping wall, be known, but in the present embodiment, has following feature: promptly, be used as and solve the two problem of first light accepting part 12 and second light accepting part 13 by identical transparent resin 8 or identical transparent resin 8 ' covering.
On the printed base plate 15 that in Figure 13 A, 13B, obtains, finish this optical distance measuring apparatus 1 by the radome 2 of installation diagram 1.
At this, in the manufacture method of the optical distance measuring apparatus 1 of Fig. 8～shown in Figure 14, illustrate and on a printed base plate 5, be formed with an optical distance measuring apparatus 1, but it is a key diagram.In fact, on printed base plate 5, form a plurality of optical distance measuring apparatus 1, and the printed base plate 5 that Figure 13 A, Figure 13 B obtain cuts out each optical distance measuring apparatus 1 by line latticedly.
Figure 15 and Figure 16 represent to use as above-mentioned light-emitting component the optical distance measuring apparatus 31 of the situation of VCSEL (surface-emitting type semiconductor laser).In addition, the situation of Figure 15 and Figure 16 and Fig. 5 and Fig. 6 is same, and for convenience of explanation, expression makes the transparent state of light-proofness resin 7.Figure 16 is that the G-G ' of Figure 15 is to pseudosection.In addition, in Figure 15 and Figure 16, the parts identical, mark same reference numerals with the optical distance measuring apparatus 1 that uses LED as light-emitting component.
The manufacture method of this optical distance measuring apparatus 31 is different with the situation of using LED in following method, that is, during cast shown in Figure 9, cast scattering transparent resin 33 on VCSEL32.
In the optical distance measuring apparatus 31 that has used above-mentioned VCSEL132, the light that penetrates from VCSEL32 has the directive property of half value half-angle 15 degree, and the light that penetrates towards the front is scattered after by the scattering transparent resin 33 of sneaking into scatterer in silicones.And, towards the light of positive area scattering eyelet 34, and first lens 3, become the light of almost parallel and inject the object (not shown) of finding range by forming by transparent resins such as epoxy resin by light-proofness resin 7.And, the light of injecting above-mentioned range finding object is reflected to the four directions by this range finding object, in its reflected light towards a part of light of optical distance measuring apparatus 31 second lens 4 by forming by transparent resins such as epoxy resin, and the eyelet 16 by light-proofness resin 7, by transparent resins such as epoxy resin 8, inject first light accepting part 12 of photo detector 11.More than, first light path is illustrated.
On the other hand, from the light of above-mentioned VCSEL32 ejaculation and scattering, for example the light that points to more than 30 degree of angle can not pass through the eyelet 34 of light-proofness resin 7, and is reflected by light-proofness resin 7.And, the transparent resins such as silicones 8 by VCSEL32 and photo detector 11 are directly linked to each other ' after, Xiang Buyu accepts another second light accepting part 12 that first light accepting part 12 from the light of above-mentioned first light path links to each other optically and injects.More than, second light path is illustrated.
As mentioned above, in the manufacture method of this optical distance measuring apparatus 31, form by cast transparent resins 8,8 such as above-mentioned silicones ', transparent resin 8,8 ' on form light-proofness resin 7 by transfer molding.Therefore, constitute the transparent resin 8 of second light path 18 ' on one side by discharging the high transparent resin 8 of stickiness ' above-mentioned needle point is moved from the needle point of divider 21 on one side, can be along the formation of second light path, 18 wire ground.In addition, owing to form light-proofness resin 7,, can form the part that becomes eyelet 14,16 simply afterwards so form the plane by the part of pushing the transparent resin 8 that links to each other with first light path 17 by mould 22 by transfer molding.
Second embodiment
In the optical distance measuring apparatus 1 of above-mentioned first embodiment, as shown in Figure 7, because second light path 18 links to each other with the end face of second light accepting part, 13 sides of photo detector 11, produce the light interference so inject the light of photo detector 11 by being reflected by above-mentioned end face, made the value deterioration of SN ratio by this light interference, error at measurment increases.In addition, owing to passed through the above-mentioned end face that most of light of second light path 18 is injected into photo detector 11, the coupling efficiency of second light path 18 reduces.Therefore, present embodiment relates to following optical distance measuring apparatus, and especially the coupling efficiency of second light path further improves, even also can carry out the distance accuracy height under the very big situation of temperature variation.
Below, about the optical distance measuring apparatus of present embodiment, be that the center has been described in detail with the part different with above-mentioned first embodiment.
Figure 17 represents that the radome with the optical distance measuring apparatus 41 of present embodiment takes off and makes light-proofness resin 47 be transparent situation for convenience of explanation.Figure 18 is that the H-H ' of Figure 17 is to pseudosection.This optical distance measuring apparatus 41 is engaged in transparent resins 48 such as covering silicones on light-emitting component 50 on the printed base plate 45 and the photo detector 51 at small pieces, and then on it, cover the light-proofness resin 47 that constitutes by epoxy resin etc., on it, cover the transparent resins such as epoxy resin that form first lens 43 and second lens 44.Wherein, Reference numeral 49 is to supply with the electric power of driving circuit and the electrode that takes out range information to the outside.
On above-mentioned photo detector 51, be formed with two light accepting parts that constitute by first light accepting part 52 and second light accepting part 53, cover by each transparent resin 48.And, between the light-emitting component 50 and photo detector 51 of light-proofness resin 47, be formed with the transparent path 58 that transparent resin 48 that makes light-emitting component 50 sides and the transparent resin 48 that covers second light accepting part 53 of photo detector 51 sides are communicated with by transparent resins such as silicones.
Figure 19 represent to find range position relation of object 55 and this optical distance measuring apparatus 41.The light that penetrates from light-emitting component 50 has the directive property of half value half-angle 60 degree, the light that penetrates towards the front is by transparent resins such as silicones 48, and the eyelet 54 by light-proofness resin 47, by first lens 43 that form by transparent resins such as epoxy resin, become almost parallel light and inject the range finding object 55.And, the light of injecting range finding object 55 is reflected to the four directions by range finding object 55, in its reflected light towards a part of light of optical distance measuring apparatus 41 second lens 44 by forming by transparent resins such as epoxy resin, and the eyelet 56 by light-proofness resin 47, by transparent resins such as silicones 48, inject first light accepting part 52 of photo detector 51.Below, this light path is made as first light path 57.
On the other hand, from the light that above-mentioned light-emitting component 50 penetrates, for example point to the angle above light of 30 degree because can not be by the eyelet 54 of light-proofness resin 47, so reflected by light-proofness resin 47.And, by the transparent path 58 that in light-proofness resin 47, forms and light-emitting component 50 and photo detector 51 are directly linked to each other, to injecting with other second light accepting parts 53 that first light accepting part of accepting from the light of first light path 57 52 separates optically by transparent resins such as silicones.Below, this light path is called second light path 59.That is, in the present embodiment, constitute above-mentioned optical coupled portion by the transparent resin 48 of light-emitting component 50 sides and the transparent resin 48 that covers second light accepting part 53 of photo detector 51 sides.
Like this, inject the first different light accepting part 52 of above-mentioned photo detector 51 and the light of second light accepting part 53 and be converted into electric current, processed by the circuit (not shown) of the formation of monolithic on photo detector 51, obtain apart from the range information of range finding object 55.At this moment, the influence of the fluctuation of the answer speed of the fluctuation of the answer speed of light-emitting component 50, photo detector 51 and environment (mainly being temperature) etc. and the light-emitting component 50 that causes and the characteristic variations of photo detector 51, the length by above-mentioned electronic circuit with second light path 59 is that benchmark is proofreaied and correct.
Below, based on Figure 20 A, 20B the manufacture method of this optical distance measuring apparatus 41 is described.
Figure 20 A of Figure 20 is the planimetric map of above-mentioned printed base plate 45, and Figure 20 B is that the I-I ' of Figure 20 A is to pseudosection.Shown in Figure 20 A, 20B, at first, on the surface of printed base plate 45, engage semi-conductor chips such as light-emitting component 50 and photo detector 51 by conductive adhesive small pieces such as silver paste.Then, engage and be electrically connected by the welding disk and the enterprising line lead of welding disk of printed base plate 45 on light-emitting component 50 and photo detector 51 such as gold thread.
Then, shown in Figure 20 B, transparent resins such as silicones 48 are cast in the position of regulation by divider 60.Because gravity or vibration and from the position expansion of regulation, use the ultraviolet hardening transparent resins as transparent resin 48, irradiation ultraviolet radiation after cast and behind the semi-solid preparation is thoroughly solidified by dryer and to get final product for the transparent resin that prevents to be poured into a mould.In addition, the coating amount of casting resin is by divider 60 controls, and in the operation of back, coating is more on the part that becomes eyelet 54,56 of light-proofness resin 47.
Then, on above-mentioned transparent resin 48, form light-proofness resin 47.Figure 21 is illustrated in the longitudinal diagram that disposes the state of printed base plate 45 in the mould 61,62 that is used for moulding light-proofness resin 47.Under this state, the part of the transparent resin 48 that links to each other with first light path 57 is pushed by mould 47 and is become the plane, becomes the part of eyelet 54,56 then.In addition, the elongated protrusion 63 of the position of the transparent resin 48 on being formed with on the mould 61 from the position of the transparent resin 48 of light-emitting component 50 sides to second light accepting part 53 of photo detector 51 sides.And, be infused in the light-proofness resin that has mixed reflectivity adjuvants such as silicon dioxide in the epoxy resin and transfer molding obtains flat light-proofness resin 47 to the space that forms by printed base plate 45 and mould 61.
Figure 22 is illustrated in the state that is formed with flat light-proofness resin 47 on the above-mentioned printed base plate 45.Be formed with eyelet 54,56 at the light-emitting component 50 of light-proofness resin 47 and the top of photo detector 51.In addition, on light-proofness resin 47, the projection 63 by mould 61 is formed with the band step groove 66 that the transparent resin 48 on second light accepting part 51 of the transparent resin 48 of light-emitting component 50 sides and photo detector 51 sides is linked to each other.In addition, Figure 22 B is that the J-J ' of Figure 22 A is to pseudosection.
Figure 23 A, 23B be the K-K ' of Figure 22 A to pseudosection, be illustrated in the section shape of the band step groove 66 that forms above of light-proofness resin 47.Under the situation of Figure 23 A, the second layer groove 66b that band is positioned at the ground floor groove 66a of lower floor in the step groove 66 and is positioned at the upper strata has rectangular section.To this, under the situation of Figure 23 B, the ground floor groove 66c in the band step groove 66 has semicircular section, and second layer groove 66d has rectangular section.
Then, shown in Figure 24 A, 24B and Figure 25 A, 25B, form transparent path 58 in the band step groove 66 on above-mentioned light-proofness resin 47.In addition, Figure 24 B and Figure 25 B be respectively the L-L ' of Figure 24 A to the M-M ' of pseudosection and Figure 25 A to pseudosection.
At first, shown in Figure 24 B, by divider 67, transparent resins such as silicones are cast in the ground floor groove 66a among Figure 23 A or among the ground floor groove 66c among Figure 23 B.Afterwards, in not shown dryer, above-mentioned transparent resin is solidified, form transparent path 58 by heat.In addition, in this case,, also can use the ultraviolet hardening transparent resin as above-mentioned transparent resin for the transparent resin expansion that prevents to pour into a mould.At this moment, by irradiation ultraviolet radiation the ultraviolet hardening transparent resin is solidified.
Then, shown in Figure 25 B, by divider 68, the light-proofness resin that in epoxy resin, is mixed with reflectivity adjuvant such as silicon dioxide in the second layer groove 66b of Figure 23 A or in the second layer groove 66d of Figure 23 B, i.e. cast on transparent path 58.Then, in not shown dryer, with above-mentioned light-proofness resin solidification, transparent path 58 is embedded in the flat light-proofness resin 47 by heat.In addition, in this case,, also can use ultraviolet hardening light-proofness resin for the transparent resin expansion that prevents to pour into a mould.At this moment, make ultraviolet hardening light-proofness resin solidification by irradiation ultraviolet radiation.
Figure 26 be the N-N ' of Figure 25 A to pseudosection, expression is embedded to the section shape of the transparent path 58 in the above-mentioned light-proofness resin 47.Wherein, Figure 26 A is the sectional view that is formed with the situation of transparent path 58 in having the band step groove 66 of the section shape shown in Figure 23 A, and transparent path 58 has rectangular section.In addition, Figure 26 B is the sectional view that is formed with the situation of transparent path 58 in having the band step groove 66 of the section shape shown in Figure 23 B, and transparent path 58 has semicircular section.Under above-mentioned any situation, all surrounded by light-proofness resin 47 by second light path 59 that transparent path 58 constitutes.
Figure 27 is illustrated in the longitudinal diagram that disposes the state of printed base plate 45 in the mould 64,65 that is used to form above-mentioned first, second lens 43,44.In the space that forms by printed base plate 45 and mould 64, carry out transfer molding behind the transparent resin such as injection ring epoxy resins, form first, second lens 43,44.
As mentioned above, in the present embodiment, second light path 59 that makes the light that penetrates from above-mentioned light-emitting component 50 be injected into second light accepting part 53 of photo detector 51 is embedded to the light-proofness resin 47, and the transparent path 58 that is directly linked to each other by the transparent resin 48 with second light accepting part 53 of the transparent resin 48 of light-emitting component 50 sides and covering photo detector 51 sides constitutes.Therefore, can prevent to be injected into the end face of second light accepting part, 53 sides in the photo detector 51 by the light after second light path 59.In addition, the outgoing plane that can make light-emitting component 50 sides in the transparent path 58 is a transparent resin 48 and relative with second light accepting part 53 of photo detector 51 via above-mentioned optical coupled portion.Therefore, can suppress the unnecessary light leak in second light path 59, and can improve coupling efficiency.
In addition, shown in Figure 26 B, form semicircle at section shape to printed base plate 45 side projectioies with above-mentioned transparent path 58, and under the situation that the upside of transparent path 58 is imbedded by the light-proofness resin that is mixed with reflectivity adjuvants such as silicon dioxide, owing to become the state of placing catoptron at the straight line portion of semi-circular shape, so can regard optically structural equivalents with the transparent path of imbedding circular section as.Therefore, can similarly reduce the transmission loss of light with optical fiber.In addition, at this moment, also can for to the semicircle of the opposite side projection of printed base plate 45 sides.
In addition, when forming above-mentioned transparent path 58, formation is by the ground floor groove 66a, the 66c that are positioned at lower floor be positioned at the second layer groove 66b on upper strata, the band step groove 66 that 66d constitutes on light-proofness resin 47, cast above-mentioned transparent resin and form transparent path 58 on ground floor groove 66a, 66c, the above-mentioned light-proofness resin of cast on second layer groove 66a, 66d and forming above the light-proofness resin 47.Therefore, can easily transparent path 58 be embedded in the light-proofness resin 47.
That is, according to present embodiment, even a kind of compact optical formula distance measuring equipment that also can carry out precision distance measurement under the very big environment of temperature variation can be provided.
Below, other manufacture methods of the optical distance measuring apparatus 41 of present embodiment are described.At first, same with Figure 24 A～Figure 24 B, form transparent path 58 in ground floor groove 66a, the 66c of the band step groove 66 on be formed at light-proofness resin 47.
Then, above-mentioned transparent resin is imbedded in the flat light-proofness resin 47.Figure 28 is illustrated in to be used for transparent resin is imbedded the longitudinal diagram that flat light-proofness resin 47 interior moulds 71,72 dispose printed base plate 45.Under this state, in the space that forms by transparent resin and mould 71 (promptly with the second layer groove 66b in the step groove 66, the zone of 66d) 73, be infused in the light-proofness resin that has mixed reflectivity adjuvants such as silicon dioxide in the epoxy resin, carry out transfer molding then, transparent path 58 is embedded in the flat light-proofness resin 47.Figure 29 A, 29B represent the printed base plate 45 of the state in the flat light-proofness resin 47 that transparent path 58 is embedded to by transfer molding.At this moment, also can access printed base plate 45 with the printed base plate 45 identical structures shown in Figure 25 A, the 25B.In addition, Figure 29 B is that the O-O ' of Figure 29 A is to pseudosection.
Afterwards, with the situation of Figure 27 similarly, configuration printed base plate 45 in the mould 64,65 that is used to form above-mentioned first, second lens 43,44, to transparent resins such as the space injection ring epoxy resins that forms by printed base plate 45 and mould 64 and carry out transfer molding, form first, second lens 43,44.
As mentioned above, in this manufacture method, configuration printed base plate 45 and be infused in the light-proofness resin that mixed reflectivity adjuvants such as silicon dioxide in the epoxy resin and transfer molding in above-mentioned mould 61,62 is formed on the tabular light-proofness resin 47 that the surface is formed with band step groove 66.Afterwards, among ground floor groove 6a, the 66c of the band step groove 66 on light-proofness resin 47 transparent path 58 is poured into a mould and be solidified to form to transparent resins such as silicones.Then, configuration printed base plate 45 is infused in the light-proofness resin that has mixed reflectivity adjuvants such as silicon dioxide in the epoxy resin and transfer molding is embedded to transparent path 58 in the flat light-proofness resin 47 in mould 71,72.Therefore, compare with the situation of in second layer groove 66b, the 66d of band step groove 66, above-mentioned light-proofness resin-cast also being solidified, can by the light-proofness resin with identical optical characteristics will transparent path 58 around surround, and the light that can further reduce transparent path 58 transmits loss.
In addition, identical with the situation of the manufacture method of the optical distance measuring apparatus 41 of Figure 20 A～shown in Figure 27 in the manufacture method of optical distance measuring apparatus shown in Figure 28 41, form band step groove 66.But in manufacture method shown in Figure 28, need not to carry out twice cast can carry out transfer molding to above-mentioned light-proofness resin in mould.Therefore, the groove that needn't necessarily make transparent path 58 form usefulness becomes the band step groove.
In addition, in the manufacture method of optical distance measuring apparatus shown in Figure 28 41, the above-mentioned transparent resin of cast in ground floor groove 66a, the 66c of band in the step groove 66 and be formed with transparent path 58.But, also printed base plate 45 can be configured in the mould and by above-mentioned transparent resin transfer molding is formed transparent path 58.
More than, embodiments of the present invention are illustrated, obviously, it can carry out various changes.These changes should not exceed spirit of the present invention and purport, and the change that those skilled in the art can expect all should be included in the scope of protection of present invention.
Claims (13)
1. an optical distance measuring apparatus is characterized in that, comprising:
Light-emitting component;
Photo detector, it is accepted from the light of above-mentioned light-emitting component ejaculation;
First optical system, it is used to form and makes first light path that is afterwards arrived above-mentioned photo detector from the light of above-mentioned light-emitting component ejaculation by the object reflection of being found range;
Second optical system, it is used to form and makes second light path that is not arrived above-mentioned photo detector from the light of above-mentioned light-emitting component ejaculation by above-mentioned range finding object reflectingly;
The range information calculation mechanism, the signal that it was exported from above-mentioned photo detector from the light time that above-mentioned second light path has been passed through in the signal and the acceptance of above-mentioned photo detector ejaculation based on the light time of having passed through above-mentioned first light path in acceptance, obtain range information apart from above-mentioned range finding object
Above-mentioned second optical system has transparent resin, the illuminating part of this transparent resin and above-mentioned light-emitting component and the light accepting part of above-mentioned photo detector directly contacts and a part of photoconduction that will penetrate from above-mentioned illuminating part to above-mentioned light accepting part.
2. optical distance measuring apparatus as claimed in claim 1, it is characterized in that, the light accepting part of above-mentioned photo detector has a plurality of, and the part in above-mentioned a plurality of light accepting part and above-mentioned first optical system be coupled optically, and other light accepting parts and above-mentioned second optical system are coupled optically.
3. optical distance measuring apparatus as claimed in claim 1 is characterized in that, above-mentioned second optical system is separated with above-mentioned first optical system optically by the light-proofness resin.
4. optical distance measuring apparatus as claimed in claim 3 is characterized in that, comprising:
Second lens that first lens that light-emitting component is used and photo detector are used, it constitutes above-mentioned first optical system and is formed by transparent resin on above-mentioned light-proofness resin;
First transparent resin, it constitutes above-mentioned first optical system and directly contacts with above-mentioned light-emitting component;
Second transparent resin, it constitutes above-mentioned first optical system and directly contacts with above-mentioned photo detector;
Two eyelets, its be arranged on above-mentioned first lens of above-mentioned light-proofness resin and above-mentioned second lens under,
Above-mentioned first lens directly contact via being arranged on the above-mentioned eyelet on the above-mentioned light-proofness resin with first transparent resin,
Above-mentioned second lens directly contact via being arranged on above-mentioned another eyelet on the above-mentioned light-proofness resin with above-mentioned second transparent resin.
5. optical distance measuring apparatus as claimed in claim 1 is characterized in that above-mentioned light-emitting component is a light emitting diode.
6. optical distance measuring apparatus as claimed in claim 1, it is characterized in that, above-mentioned light-emitting component is a surface-emitting type semiconductor laser, constitutes the part that directly contacts with illuminating part above-mentioned light-emitting component above-mentioned transparent resin of above-mentioned second optical system, is the scattering transparent resin.
7. the manufacture method of an optical distance measuring apparatus, it is used to make the described optical distance measuring apparatus of claim 3, it is characterized in that the above-mentioned transparent resin that constitutes above-mentioned second optical system forms by cast, above-mentioned light-proofness resin forms by casting mold or transfer molding.
8. the manufacture method of an optical distance measuring apparatus, it is used to make the described optical distance measuring apparatus of claim 7, it is characterized in that, the light accepting part of above-mentioned photo detector has a plurality of, and, part in a plurality of light accepting parts and above-mentioned first optical system are coupled optically, and other light accepting parts and above-mentioned second optical system are coupled optically
And the light accepting part that is coupled optically of the light accepting part that is coupled optically of above-mentioned first optical system and above-mentioned second optical system between, be provided with the wall that when above-mentioned cast, above-mentioned transparent resin can not be crossed.
9. optical distance measuring apparatus as claimed in claim 3, it is characterized in that, the both ends that constitute the above-mentioned transparent resin of above-mentioned second optical system constitute the optical coupled portion that directly contacts with the light accepting part of the illuminating part of above-mentioned light-emitting component and above-mentioned photo detector and be coupled optically with above-mentioned illuminating part and above-mentioned light accepting part
The both ends of the transparent path that constitutes between above-mentioned two optical coupled portions are relative with above-mentioned illuminating part and above-mentioned light accepting part via above-mentioned optical coupled portion,
Surrounded by above-mentioned light-proofness resin around the above-mentioned transparent path.
10. optical distance measuring apparatus as claimed in claim 9 is characterized in that, the above-mentioned transparent path of above-mentioned transparent resin has semicircular section shape, and above-mentioned light-proofness resin contains the reflective material and constitutes.
11. the manufacture method of an optical distance measuring apparatus, it is used to make the described optical distance measuring apparatus of claim 9, it is characterized in that, form the above-mentioned light-proofness resin that the surface has the band step groove of two-layer structure, this two-layer structure be near the above-mentioned light-emitting component near above-mentioned photo detector, section shape forms step-like, cast above-mentioned transparent resin and solidifying in the ground floor groove of the above-mentioned band step groove of being located at above-mentioned light-proofness resin surface, then, cast above-mentioned light-proofness resin and solidifying in the second layer groove of above-mentioned band step groove, thus, form the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin on every side.
12. the manufacture method of an optical distance measuring apparatus, it is used to make the described optical distance measuring apparatus of claim 9, it is characterized in that, formation near the above-mentioned light-emitting component near above-mentioned photo detector, be provided with the above-mentioned light-proofness resin of groove from the teeth outwards, above-mentioned transparent resin is poured into the degree of depth midway in the above-mentioned groove of above-mentioned light-proofness resin surface setting and solidifies, then, the substrate that will be formed with above-mentioned light-proofness resin and above-mentioned transparent resin is arranged in the mould, inject above-mentioned light-proofness resin and transfer molding on the above-mentioned transparent resin in above-mentioned groove, the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin around forming thus.
13. the manufacture method of an optical distance measuring apparatus, it is used to make the described optical distance measuring apparatus of claim 9, it is characterized in that, formation near the above-mentioned light-emitting component near above-mentioned photo detector, be provided with the above-mentioned light-proofness resin of groove from the teeth outwards, the substrate that will be formed with above-mentioned light-proofness resin is arranged in first mould, above-mentioned transparent resin is injected into the degree of depth midway in the above-mentioned groove that above-mentioned light-proofness resin surface is provided with and transfer molding, the aforesaid substrate that will be formed with above-mentioned transparent resin is arranged in second mould, and above-mentioned light-proofness resin is injected on the above-mentioned transparent resin in the above-mentioned groove and transfer molding the above-mentioned transparent path that is surrounded by above-mentioned light-proofness resin around forming thus.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006143944 | 2006-05-24 | ||
| JP143944/06 | 2006-05-24 | ||
| JP088390/07 | 2007-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101078771A true CN101078771A (en) | 2007-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710105195 Pending CN101078771A (en) | 2006-05-24 | 2007-05-24 | Optical distance measuring device and manufacturing method therefor |
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| Country | Link |
|---|---|
| CN (1) | CN101078771A (en) |
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| CN102589649A (en) * | 2012-01-19 | 2012-07-18 | 河北联合大学 | Two-color laser level gage |
| CN103124912A (en) * | 2010-10-04 | 2013-05-29 | 罗伯特·博世有限公司 | Optical shielding device for separating optical paths |
| CN103499338A (en) * | 2013-05-14 | 2014-01-08 | 罗江临 | Method for guaranteeing measuring range of laser range measurer and improving measuring precision |
| CN104584434A (en) * | 2012-10-18 | 2015-04-29 | 夏普株式会社 | Electrode substrate, display device and touch panel equipped with same |
| CN108369969A (en) * | 2015-12-08 | 2018-08-03 | 新日本无线株式会社 | Reflective optical system |
| CN108511538A (en) * | 2012-04-05 | 2018-09-07 | 赫普塔冈微光有限公司 | Optical-electric module |
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- 2007-05-24 CN CN 200710105195 patent/CN101078771A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103124912A (en) * | 2010-10-04 | 2013-05-29 | 罗伯特·博世有限公司 | Optical shielding device for separating optical paths |
| US9368529B2 (en) | 2010-10-04 | 2016-06-14 | Robert Bosch Gmbh | Optical shielding device for separating optical paths |
| CN103124912B (en) * | 2010-10-04 | 2016-09-14 | 罗伯特·博世有限公司 | For separating the optics shielding device of optical path |
| CN102589649A (en) * | 2012-01-19 | 2012-07-18 | 河北联合大学 | Two-color laser level gage |
| CN108511538A (en) * | 2012-04-05 | 2018-09-07 | 赫普塔冈微光有限公司 | Optical-electric module |
| CN104584434A (en) * | 2012-10-18 | 2015-04-29 | 夏普株式会社 | Electrode substrate, display device and touch panel equipped with same |
| CN104584434B (en) * | 2012-10-18 | 2018-01-30 | 夏普株式会社 | Optical sensor and electronic equipment |
| CN103499338A (en) * | 2013-05-14 | 2014-01-08 | 罗江临 | Method for guaranteeing measuring range of laser range measurer and improving measuring precision |
| CN108369969A (en) * | 2015-12-08 | 2018-08-03 | 新日本无线株式会社 | Reflective optical system |
| CN114325731A (en) * | 2021-04-19 | 2022-04-12 | 神盾股份有限公司 | distance sensing device |
| WO2022222485A1 (en) * | 2021-04-19 | 2022-10-27 | 神盾股份有限公司 | Distance sensing device |
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