WO2023067757A1 - 反射型光センサ - Google Patents

反射型光センサ Download PDF

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Publication number
WO2023067757A1
WO2023067757A1 PCT/JP2021/038923 JP2021038923W WO2023067757A1 WO 2023067757 A1 WO2023067757 A1 WO 2023067757A1 JP 2021038923 W JP2021038923 W JP 2021038923W WO 2023067757 A1 WO2023067757 A1 WO 2023067757A1
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WIPO (PCT)
Prior art keywords
light
concave mirror
focal point
focus
reflected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/038923
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English (en)
French (fr)
Japanese (ja)
Inventor
章弘 舘小路
悦司 大村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyoto Semiconductor Co Ltd
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Kyoto Semiconductor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyoto Semiconductor Co Ltd filed Critical Kyoto Semiconductor Co Ltd
Priority to JP2023554175A priority Critical patent/JP7656063B2/ja
Priority to PCT/JP2021/038923 priority patent/WO2023067757A1/ja
Publication of WO2023067757A1 publication Critical patent/WO2023067757A1/ja
Priority to US18/638,618 priority patent/US20240266449A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
    • H10F55/20—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/40—Optical elements or arrangements
    • H10F77/413—Optical elements or arrangements directly associated or integrated with the devices, e.g. back reflectors

Definitions

  • the present invention relates to a reflective optical sensor that detects an object by irradiating it with light and detecting the light reflected by the object.
  • a reflective optical sensor that detect objects to be detected by irradiating them with light and detecting the light reflected by the objects to be detected have been widely used.
  • a reflective optical sensor can detect an object to be detected without contact, and is therefore generally used for purposes such as detection of a rotation angle and detection of an edge of an object.
  • a reflective optical sensor has a light-emitting element, a light-receiving element, and a light-shielding wall disposed between them, as disclosed in Patent Document 1, for example.
  • the light receiving element is configured to receive the reflected light.
  • the fact that the output of the light-receiving element fluctuates depending on the presence or absence of reflected light and the intensity of the reflected light is used to detect the object to be detected.
  • the light-emitting element irradiates a nearby object to be detected with diffused light. Therefore, most of the light emitted by the light emitting element is irradiated to the object to be detected, but even if the object to be detected has a high reflectance, part of the light reflected by the object to be detected enters the light receiving element. There is very little light.
  • the coupling efficiency the ratio of the light incident on the light receiving element to the light emitted by the light emitting element
  • the result of the ray tracing simulation in the reflective photosensor of Patent Document 1 shows that the coupling efficiency is about 3%. An improvement in coupling efficiency is desired.
  • An object of the present invention is to provide a reflective photosensor that can improve coupling efficiency.
  • the reflective optical sensor of the first aspect of the invention comprises a light emitting element and a light receiving element, and the light receiving element detects the reflected light of the light emitted from the light emitting element reflected by the object to be detected, thereby detecting the object to be detected.
  • the reflective optical sensor has an open box-like case integrally formed with a first concave mirror and a second concave mirror, each of which has a reflecting surface that is a partially concave surface of an ellipsoid of revolution obtained by rotating an ellipse around its major axis.
  • the first concave mirror and the second concave mirror are configured such that one focus of the first concave mirror coincides with one focus of the second concave mirror to form a common focus, and the other focus of the first concave mirror is the first concave mirror.
  • the light emitting element is formed in an open shape toward the open side of the case so that the focal point and the second focal point, which is the other focal point of the second concave mirror, do not overlap, and the light emitting element extends from the position of the first focal point to the first concave mirror.
  • the light receiving element detects the reflected light reflected by the second concave mirror at the position of the second focal point.
  • the reflective optical sensor has a case integrally formed with the first and second concave mirrors each having a reflecting surface that is a partial concave surface of an ellipsoid of revolution.
  • the first and second concave mirrors are formed so that one focal point of each is a common focal point and the other focal points of each are not overlapped. Then, the light emitting element at the position of the first focal point, which is not the common focal point of the first concave mirror, emits light toward the first concave mirror, and the light reflected by the first concave mirror is positioned at or near the common focal point to be detected. object is irradiated.
  • the light reflected by the object to be detected is reflected by the second concave mirror and enters the light receiving element at the second focal point, which is not the common focal point of the second concave mirror. Since the light emitted from the position of the first focal point is condensed to the common focal point by the first concave mirror, most of the light from the light emitting element is irradiated onto the object to be detected, and the object is directed toward the second concave mirror. reflected. Since this reflected light is reflected at or near the common focal point, most of the reflected light is reflected by the second concave mirror, condensed at the second focal point of the second concave mirror, and incident on the light receiving element at the position of the second focal point. do.
  • the diffused light emitted from the light-emitting element can be condensed and applied to the object to be detected, and the reflected light can be condensed and detected by the light-receiving element.
  • Coupling efficiency can be improved when the rate of incident light is defined as coupling efficiency.
  • the first concave mirror and the second concave mirror have the first focal point and the second focal point on the same straight line across the common focal point. It is characterized by being formed so as to be located in According to the above configuration, the first focal point and the second focal point are on the same straight line with the common focal point interposed therebetween. A detection position is set, and the object to be detected can be easily aligned with the detection position.
  • the first concave mirror and the second concave mirror have a major axis of the first concave mirror passing through the first focal point and the common focal point; A long axis of the second concave mirror passing through the second focal point and the common focal point is formed so as to intersect at the common focal point at a predetermined crossing angle.
  • a reflective optical sensor according to the first aspect of the invention, wherein the light emitting element and the light receiving element are accommodated in the case, and a sealing resin through which light from the light emitting element is transmitted is contained in the case. It is characterized by being filled. According to the above configuration, the sealing resin protects the light-emitting element, the light-receiving element, and the reflecting surfaces of the first and second concave mirrors, thereby preventing damage to the reflective optical sensor due to collision with an object to be detected.
  • a reflective optical sensor according to the first aspect of the present invention, in which light from the light emitting element is prevented from directly entering the second concave mirror between the first concave mirror and the second concave mirror. It is characterized by having a light shielding wall. According to the above configuration, it is possible to prevent the light from the light emitting element from entering the light receiving element without being reflected by the object to be detected, thereby preventing erroneous detection of the object to be detected.
  • the reflective optical sensor of the present invention it is possible to improve the coupling efficiency.
  • FIG. 1 is a plan view of a reflective optical sensor according to Example 1 of the present invention
  • FIG. FIG. 2 is a sectional view taken along line II-II of FIG. 1; It is explanatory drawing of an ellipse.
  • FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a reflective optical sensor according to Example 2 of the present invention; FIG.
  • FIG. 11 is an example of a ray tracing simulation result in the reflective optical sensor according to Example 2;
  • FIG. FIG. 10 is a diagram showing the relationship between the distance h to the object to be detected and the coupling efficiency in the reflective optical sensor according to Example 2;
  • FIG. 10 is a contour line diagram showing the relationship between the distance h to the object to be detected, the tilt angles of the major axes of the first and second concave mirrors, and the maximum value of the obtained coupling efficiency in the reflective optical sensor according to the second embodiment.
  • FIG. 10 is a plan view showing a modification of the reflective photosensor according to the first embodiment;
  • the reflective optical sensor 1A has an open box-shaped case 2 with a rectangular parallelepiped top surface open, a light emitting element 3 and a light receiving element 4 .
  • the open side of the case 2 is assumed to be above the reflective photosensor 1A, the reflective photosensor 1A can be used in various postures depending on the application.
  • a first concave mirror 5 and a second concave mirror 6 are integrally formed on the inner bottom of the case 2 in an open shape with the reflective surface facing the open side of the case 2 .
  • the first concave mirror 5 has a reflecting surface that is a partially concave surface of an ellipsoid of revolution obtained by rotating the ellipse E1 about its major axis.
  • the second concave mirror 6 has a reflecting surface that is a partially concave surface of an ellipsoid of revolution obtained by rotating the ellipse E2 about its major axis.
  • one focus of the ellipse E1 forming the first concave mirror 5 is aligned with one focus of the ellipse E2 forming the second concave mirror 6 to form a common focus F0.
  • the other focus of the ellipse E1 is the first focus F1 and the other focus of the ellipse E2 is the second focus F2
  • the first concave mirror 5 and A second concave mirror 6 is formed.
  • the first concave mirror 5 and the second concave mirror 6 are formed such that a plane that includes the common focal point F0 and passes between the first focal point F1 and the second focal point F2 serves as a boundary.
  • first concave mirror 5 and the second concave mirror 6 are arranged so that the first focal point F1 and the second focal point F2 are located on the same straight line (on the straight line L) across the common focal point F0. and the second concave mirror 6 are perpendicular to the straight line L.
  • the case 2 is formed, for example, by resin molding in the shape of a rectangular parallelepiped box with an open upper surface, and has a partially concave surface of each ellipsoid of revolution of ellipses E1 and E2 corresponding to the first and second concave mirrors 5 and 6 on the inner bottom. is formed. Reflecting films 5a and 6a containing metal such as gold and titanium are formed on at least these partial concave surfaces, and the first and second concave mirrors 5 and 6 are formed integrally with the case 2. As shown in FIG. At the boundary between the first concave mirror 5 and the second concave mirror 6, a light blocking wall 7 extending from the inner bottom of the case 2 toward the open side is formed so as to partition the first concave mirror 5 and the second concave mirror 6. ing.
  • the open end of the case 2 is recessed from the open end face 2e of the case 2 toward the bottom for positioning the pair of first lead frames 8a, 8b and the pair of second lead frames 9a, 9b. recessed portions 2a to 2d are formed.
  • a light emitting element 3 is fixed to one side of the tip of the first lead frame 8a which is placed and fixed in the recess 2a.
  • the first lead frame 8a is fixed to the concave portion 2a so that the light emitting surface of the light emitting element 3 from which light is emitted faces the first concave mirror 5 and the light emitting element 3 is arranged at the position of the first focal point F1. be. At this time, the light emitting element 3 is accommodated in the case 2 .
  • the concave portions 2a to 2d may not be formed and may be positioned by another method.
  • a light receiving element 4 is fixed to one side of the tip of the second lead frame 9a which is placed and fixed in the recess 2c.
  • the second lead frame 9a is arranged such that the light-receiving surface of the light-receiving element 4 for incident light faces the second concave mirror 6, and the light-receiving element 4 is arranged at or near the second focal point F2. is fixed to the concave portion 2c.
  • the light receiving element 4 is housed inside the case 2 .
  • the case 2 housing the light emitting element 3 and the light receiving element 4 is filled with a sealing resin 10 , and the light emitting element 3 and the light receiving element 4 are covered with the sealing resin 10 .
  • the first lead frames 8 a and 8 b and the second lead frames 9 a and 9 b may also be covered with the sealing resin 10 .
  • the sealing resin 10 is translucent to allow the light from the light emitting element 3 to pass therethrough, and is, for example, an epoxy-based synthetic resin that allows visible light or infrared light to pass therethrough.
  • the sealing resin 10 protects the reflecting surfaces of the light emitting element 3 , the light receiving element 4 , the first and second concave mirrors 5 and 6 , and restricts the oscillation of the light emitting element 3 and the light receiving element 4 .
  • the sealing resin 10 may be omitted when external vibrations are not transmitted to the light emitting element 3 and the light receiving element 4 .
  • a surface 10a of the sealing resin 10 is formed flat so as to match the open side end surface 2e of the case 2 except for the portions of the first lead frames 8a, 8b and the second lead frames 9a, 9b.
  • the surface 10a of the sealing resin 10 is a plane in the vicinity of the common focal point F0 that coincides with the plane including the first focal point F1, the second focal point F2, and the common focal point F0, or is parallel to this plane. The position of the common focal point F0 or the vicinity (upper side) of the common focal point F0 becomes the detection position of the object.
  • first lead frames 8a, 8b and the second lead frames 9a, 9b are elongate members made of, for example, Kovar (an alloy containing iron, nickel, and cobalt), it is not easy to attach them to the case 2 individually. Therefore, as shown in FIG. 4, the light-emitting element 3 and the light-receiving element 4 are fixed to first lead frames 8a, 8b and second lead frames 9a, 9b formed integrally with the rectangular frame 11, for example, by bonding wires. Connect electrically. Then, the first lead frames 8a, 8b and the second lead frames 9a, 9b are placed together with the frame 11 in the corresponding recesses 2a to 2d. After sealing with the sealing resin 10, the base ends of the first lead frames 8a, 8b and the second lead frames 9a, 9b are cut, for example, as indicated by broken lines, thereby separating and removing the frame 11.
  • FIG. 4 an alloy containing iron, nickel, and cobalt
  • the frame 11 can also be formed in a tape shape or a sheet shape so that the frame 11 having the first lead frames 8a, 8b and the second lead frames 9a, 9b is connected in a plane. In this case, fixing and electrical connection of the light emitting element 3 and the light receiving element 4 are facilitated, and, for example, they can be attached to a plurality of cases 2 arranged at predetermined intervals continuously or simultaneously, thereby improving manufacturing efficiency. improves.
  • the light emitting element 3 is a light emitting diode with an irradiation angle of 150°.
  • the light i2 is reflected by the object OB to be detected, the reflected light i3 is reflected by the second concave mirror 6, and the reflected light i4 is reflected. is condensed at the second focal point F2. Then, the reflected light i4 is incident on the light receiving element 4 at the position of the second focal point F2, and a photocurrent is output.
  • the light i2 which is the light emitted from the light emitting element 3 and reflected by the first concave mirror 5 does not enter the second concave mirror 6 and exits outside. No incident.
  • the second concave mirror 6 reflects the reflected light i3 of the light from the light emitting element 3 reflected by the object to be detected OB, and the light receiving element 4 detects the reflected light i4 reflected by the second concave mirror 6.
  • An object OB can be detected.
  • the coupling efficiency When the ratio of light incident on the light receiving element 4 to the light emitted by the light emitting element 3 is taken as the coupling efficiency, the higher the coupling efficiency, the larger the photocurrent output. Therefore, it is possible to easily prevent erroneous detection of the object to be detected OB due to the influence of stray light, for example, and it is also possible to reduce power consumption by reducing the light intensity of the light emitting element 3, so realization of high coupling efficiency is desired.
  • the coupling efficiency when the object to be detected OB is separated from the common focus F0 with the distance h between the common focus F0 and the object to be detected OB as a parameter. is shown in FIG.
  • the coupling efficiency exceeds 60%. Although the coupling efficiency tends to decrease as the distance h increases, the coupling efficiency is about 10% even when the distance h is 2 mm. To ensure high coupling efficiency even when a certain distance h is secured in order to prevent damage to the reflective optical sensor 1A and the object to be detected OB due to contact between the reflective optical sensor 1A and the object to be detected OB. can be done. Moreover, even when the common focus F0 is located inside the sealing resin 10, high coupling efficiency can be obtained.
  • a reflective photosensor 1B obtained by partially modifying the reflective photosensor 1A of the first embodiment will be described. Parts equivalent to those of the first embodiment are assigned the same reference numerals as those of the first embodiment, and description thereof is omitted.
  • the reflective optical sensor 1B has a box-shaped case 2 with a rectangular parallelepiped top open, a light emitting element 3 and a light receiving element 4 .
  • a first concave mirror 15 and a second concave mirror 16 are integrally formed on the inner bottom of the case 2 so that the reflecting surface faces the open side of the case 2 .
  • one focus of the ellipse E1 forming the first concave mirror 15 is aligned with one focus of the ellipse E2 forming the second concave mirror 16 to form a common focus F0.
  • the first concave mirror 15 is arranged so that the first focus F1 and the second focus F2 do not overlap. and a second concave mirror 16 are arranged. At this time, the first concave mirror 15 and the second concave mirror 16 are formed so that a plane including the common focal point F0 and passing between the first focal point F1 and the second focal point F2 becomes a boundary.
  • the reflective optical sensor 1B rotates the major axes of the ellipses E1 and E2 about the common focal point F0 by an angle ⁇ , respectively, so that the major axes of the ellipses E1 and E2 are They are in an inclined state.
  • the first focal point F1 and the second focal point F2 are located below the common focal point F0 (bottom side of case 2).
  • the major axis of the ellipse E1 inclined by the angle ⁇ is the straight line L1 passing through the first focal point F1 and the common focal point F0.
  • the major axis of the ellipse E2 inclined by the angle ⁇ is the straight line L2 passing through the second focal point F2 and the common focal point F0. Since the long axes are tilted, the ellipses E1 and E2 are tilted.
  • a reflecting film 5a serving as a reflecting surface is formed on the partially concave surface of the ellipsoid of revolution obtained by rotating the ellipse E1 around its inclined major axis (straight line L1), and the first concave mirror 15 is formed.
  • a reflecting film 6a serving as a reflecting surface is formed on the partially concave surface of the ellipsoid of revolution obtained by rotating the ellipse E2 around its inclined major axis (straight line L2), and a second concave mirror 16 is formed.
  • the first focal point F1, the second focal point F2, and the common focal point F0 are included in one plane (the cross section shown in FIG. 7)
  • the inclination angle ⁇ of the long axis is, for example, 10°
  • the angle 2 ⁇ is A predetermined intersection angle of the long axes of the two ellipses E1 and E2 is set.
  • a light shielding wall 7 extending from the bottom of the case 2 toward the open side is formed so as to partition the first concave mirror 15 and the second concave mirror 16.
  • a light-emitting element 3 is fixed to one surface of the tip of a first lead frame 8a fixed to the concave portion 2a to 2d of the concave portions 2a to 2d formed in the open end of the case 2.
  • the first lead frame 8a is placed in the concave portion 2a so that the light emitting surface of the light emitting element 3 from which light is emitted faces the first concave mirror 15 and the light emitting element 3 is arranged at the position of the first focal point F1. , are fixed, and the light emitting element 3 is accommodated in the case 2 .
  • a light receiving element 4 is fixed to one side of the tip of the second lead frame 9a fixed to the recess 2c.
  • the second lead frame 9a is placed in the concave portion 2c so that the light receiving surface of the light receiving element 4 for receiving light faces the second concave mirror 16 and the light receiving element 4 is arranged at the position of the second focal point F2. , and the light receiving element 4 is accommodated in the case 2 .
  • the light emitting element 3 is supplied with power for light emission through a pair of corresponding first lead frames 8a and 8b, and a pair of corresponding second lead frames is supplied from the light receiving element 4.
  • a photocurrent is output via 9a and 9b.
  • the case 2 housing the light emitting element 3 and the light receiving element 4 is filled with a sealing resin 10 , and the light emitting element 3 and the light receiving element 4 are covered with the sealing resin 10 .
  • the sealing resin 10 is translucent to allow the light from the light emitting element 3 to pass therethrough, and is, for example, an epoxy-based synthetic resin that allows visible light or infrared light to pass therethrough.
  • the first lead frames 8a, 8b and the second lead frames 9a, 9b may also be covered with the sealing resin 10.
  • a surface 10a of the sealing resin 10 is formed flat so as to match the open side end surface 2e of the case 2 except for the portions of the first lead frames 8a, 8b and the second lead frames 9a, 9b.
  • a surface 10a of the sealing resin 10 is a plane near the first and second focal points F1 and F2 that coincides with a plane including the first focal point F1 and the second focal point F2 or that is parallel to this plane. Then, the position of the common focal point F0 separated from the surface 10a of the sealing resin 10 or the vicinity of the common focal point F0 becomes the detection position of the object to be detected.
  • the light shielding wall 7 prevents the light emitted from the light emitting element 3 from directly entering the second concave mirror 16 .
  • the light emitting element 3 is a light emitting diode with an irradiation angle of 150°.
  • the light i2 is reflected by the object to be detected OB, the reflected light i3 is reflected by the second concave mirror 16, and the reflected light i4 is reflected. is condensed at the second focal point F2. Then, the reflected light i4 is incident on the light receiving element 4 at the position of the second focal point F2, and a photocurrent is output.
  • the light i2 which is the light emitted from the light emitting element 3 and reflected by the first concave mirror 15 does not enter the second concave mirror 16 and exits outside. No incident.
  • the second concave mirror 16 reflects the reflected light i3 of the light from the light emitting element 3 reflected by the object to be detected OB, and the light receiving element 4 detects the reflected light i4 reflected by the second concave mirror 16.
  • An object OB can be detected.
  • the coupling efficiency When the ratio of light incident on the light receiving element 4 to the light emitted by the light emitting element 3 is defined as the coupling efficiency, it is desired to realize a high coupling efficiency.
  • the distance h between the object OB and the plane including the straight line L3 passing through the first and second focal points F1 and F2 is used as a parameter.
  • FIG. 9 shows the coupling efficiency when separated from the type photosensor 1B.
  • the angle of inclination of the first and second concave mirrors 15 and 16 (angle of inclination of major axes of ellipses E1 and E2) ⁇ is 10°.
  • the reflective optical sensor 1A (1B) has a case 2 integrally formed with first and second concave mirrors 5, 6 (15, 16) each having a reflecting surface that is a partially concave surface of an ellipsoid of revolution.
  • the first and second concave mirrors 5 and 6 (15 and 16) are formed so that one of their focal points is a common focal point F0 and the other focal points (first focal point F1 and second focal point F2) do not overlap.
  • the light emitting element 3 at the position of the first focal point F1 of the first concave mirror 5 irradiates the light i1 toward the first concave mirror 5 (15), and the light reflected by the first concave mirror 5 (15) is irradiated onto the object to be detected OB positioned at or near the common focal point F0.
  • the reflected light i3 reflected by the object to be detected OB is reflected by the second concave mirror 6 (16) and enters the light receiving element 4 at the position of the second focal point F2.
  • the light i1 emitted from the position of the first focal point F1 is condensed to the common focal point F0 by the first concave mirror 5 (15)
  • most of the light emitted from the light emitting element 3 is irradiated onto the object OB to be detected. It is reflected toward the second concave mirror 6 (16) by the detected object OB. Since this reflected light i3 is reflected at or near the common focal point F0, most of the reflected light i3 is reflected by the second concave mirror 6 (16) and condensed at the second focal point F2 of the second concave mirror 6 (16). and is incident on the light receiving element 4 at the position of the second focal point F2. Therefore, the diffused light emitted from the light emitting element 3 can be condensed and applied to the object to be detected OB, and the reflected light can be condensed and detected by the light receiving element 4, so that the coupling efficiency can be improved. can.
  • the first concave mirror 5 and the second concave mirror 6 of the reflective optical sensor 1A are formed so that the first focal point F1 and the second focal point F2 are located on the same straight line (on the straight line L) with the common focal point F0 interposed therebetween. . Since the first focal point F1 and the second focal point F2 are on the same straight line across the common focal point F0, when the light-emitting element 3 and the light-receiving element 4 are arranged, an object to be detected is placed between the light-emitting element 3 and the light-receiving element 4. The detection position of the OB is set, and the object to be detected OB can be easily aligned with the detection position.
  • the first concave mirror 15 and the second concave mirror 16 of the reflective photosensor 1B are arranged such that the long axis (straight line L1) of the first concave mirror 15 passing through the first focal point F1 and the common focal point F0 and the second focal point F2 and the common focal point F0. It is formed to intersect with the long axis (straight line L2) of the second concave mirror 16 at a predetermined intersection angle at the common focal point F0.
  • the detection position of the object to be detected OB is set at a position separated from the reflective optical sensor 1B on the outside of the case 2, and the object to be detected OB is detected in a non-contact manner. Objects can be detected. Therefore, it is possible to prevent damage to the object to be detected OB and damage to the reflective optical sensor 1B due to collision between the object to be detected OB and the reflective optical sensor 1B.
  • the reflective optical sensor 1A (1B) the light-emitting element 3 and the light-receiving element 4 are accommodated in the case 2, and the case 2 is filled with a sealing resin 10 through which light from the light-emitting element 3 is transmitted.
  • the reflective surfaces of the light-emitting element 3, the light-receiving element 4, and the first and second concave mirrors 5, 6 (15, 16) are protected by the sealing resin 10, and the reflective optical sensor 1A (1B) is detected when it collides with the object to be detected OB. ) can be prevented from being damaged.
  • the reflective optical sensor 1A (1B) is between the first concave mirror 5 (15) and the second concave mirror 6 (16) to prevent the light from the light emitting element 3 from directly entering the second concave mirror 6 (16). It has a light shielding wall 7. Since the light shielding wall 7 blocks light that is not reflected by the object OB and enters the light receiving element 4, erroneous detection of the object OB can be prevented.
  • the long axes of the ellipses E1 and E2 are arranged at the common focal point F0.
  • the first and second concave mirrors 25 and 26 intersecting with each other can be formed in the case 2 to constitute the reflective photosensor 1C.
  • illustration is omitted, instead of the first lead frames 8a and 8b and the second lead frames 9a and 9b, the light emitting element 3 and the light receiving element 4 are fixed to a lid member transparent to the light emitted from the light emitting element 3.
  • This cover member may be fixed to the case 2 by forming a plurality of wirings electrically connected to the case 2 .
  • the refraction on the surface 10a of the sealing resin 10 is omitted. Just do it.
  • those skilled in the art can implement various modifications to the above embodiment without departing from the scope of the present invention, and the present invention includes such modifications.
  • Reflective optical sensor 2 Cases 2a to 2d: Concave part 2e: Open side end face 3: Light emitting element 4: Light receiving element 5, 15, 25: First concave mirror 6, 16, 26: Second concave mirror 7 : Light shielding walls 8a, 8b: First lead frames 9a, 9b: Second lead frame 10: Sealing resin 10a: Surface 11: Frame F0: Common focus F1: First focus F2: Second focus

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  • Geophysics And Detection Of Objects (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
PCT/JP2021/038923 2021-10-21 2021-10-21 反射型光センサ Ceased WO2023067757A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2023554175A JP7656063B2 (ja) 2021-10-21 2021-10-21 反射型光センサ
PCT/JP2021/038923 WO2023067757A1 (ja) 2021-10-21 2021-10-21 反射型光センサ
US18/638,618 US20240266449A1 (en) 2021-10-21 2024-04-17 Reflective optical sensor

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Application Number Priority Date Filing Date Title
PCT/JP2021/038923 WO2023067757A1 (ja) 2021-10-21 2021-10-21 反射型光センサ

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JPS6312181A (ja) * 1986-07-03 1988-01-19 Toshiba Corp 樹脂封止型半導体光結合装置
JPH01241184A (ja) * 1988-03-23 1989-09-26 Iwasaki Electric Co Ltd 反射型フォトセンサ
JPH087615A (ja) * 1994-06-22 1996-01-12 Ichikoh Ind Ltd 補助リフレクタを備えた光分配構造
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