JP6696624B2 - Shape measuring device - Google Patents

Description

  The present invention relates to a shape measuring device.

  For example, Patent Document 1 discloses a shape measuring device. The shape measuring device includes a retroreflector. The retroreflector reflects the incident light in the opposite direction without depending on the angle of the reflecting surface. Therefore, it is unlikely to be affected by an error in the installation of the retroreflector.

Japanese special table 2010-518385 gazette

  However, a diffraction phenomenon occurs in the retroreflector. Diffracted light due to the diffraction phenomenon includes reflected light in different directions other than retroreflected light that is reflected in the opposite direction to the incident light. Therefore, the reflected light intensity distribution by the retroreflector is disturbed. As a result, the measurement accuracy of the shape of the measurement target deteriorates.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a shape measuring device capable of removing the influence of diffracted light by a retroreflector.

  The shape measuring device according to the present invention includes a projector that projects parallel light having a width exceeding the width of a shape measurement target, a half mirror that reflects a part of the parallel light and guides the parallel light to the measurement target, and the measurement target. And a retroreflector that is disposed on the opposite side of the half mirror and reflects in the opposite direction the light that has traveled to the opposite side of the measurement target in the parallel light without being blocked by the measurement target. It is arranged on the opposite side of the retroreflector with respect to the mirror, and the reflected light from the retroreflector is parallel to the incident direction of the light to the retroreflector among the reflected light after passing through the half mirror. A light receiver that receives light other than light and that is parallel to the incident direction of light on the retroreflector.

  The shape measuring device according to the present invention is a light source that casts light, a half mirror that reflects a part of the light from the light source and guides a part of the light to the measurement target, and a half mirror for the measurement target. A first lens which is arranged on the side of the half mirror and forms the light into parallel light after the light from the projector is reflected by the half mirror; and a first lens which is arranged on the opposite side of the first lens with respect to the measurement target. And a retroreflector for reflecting in the opposite direction the light that travels to the opposite side of the measuring object without being blocked by the measuring object of the parallel light, and the opposite side of the first lens with respect to the half mirror. And having an opening with a preset width, and the incident direction of light to the retroreflector when the reflected light from the retroreflector passes through the first lens and the half mirror. A slit body that blocks light other than parallel light, is arranged on the opposite side of the half mirror with respect to the slit body, and is oriented in a direction parallel to the incident direction of light to the retroreflector, from the slit body. A second lens that shapes the light of the second lens, and is arranged on the opposite side of the slit body with respect to the second lens, and is parallel to the incident direction of the light from the second lens to the retroreflector. A light receiving element that receives light other than light and that is parallel to the incident direction of light on the retroreflector.

  According to these inventions, the shape measuring device allows the light incident on the retroreflector without receiving any light other than the light parallel to the incident direction of the light on the retroreflector among the reflected light from the retroreflector. Receive light parallel to the direction. Therefore, the influence of the diffracted light due to the retroreflector can be removed.

It is a block diagram of the principal part of the elevator to which the shape measuring apparatus in the form 1 of the actual condition of this invention is applied. It is a top view of the shape measuring device in the form 1 of the present invention. It is a perspective view of the principal part of the floodlight of the shape measuring device in the form 1 of the actual condition of this invention. FIG. 3 is a plan view of a main part of a projector of the shape measuring apparatus according to the first embodiment of the actual condition of the present invention. FIG. 3 is a perspective view of a main part of a light receiver of the shape measuring apparatus according to the first embodiment of the present invention. FIG. 3 is a plan view of a main part of a light receiver of the shape measuring apparatus according to the first embodiment of the actual condition of the present invention. It is a perspective view of the rope used as the measuring object by the shape measuring device in form 1 of the actual condition of this invention. It is sectional drawing of the rope used as the measuring object by the shape measuring device in the form 1 of the present condition of this invention. It is a figure which shows an example of the light reception intensity distribution by the shape measuring device in the form 1 of the actual condition of this invention. It is a figure which shows the fluctuation | variation of the width dimension of the lobe which the shape measuring apparatus in the actual condition 1 of this invention measured when the car was running. It is a hardware block diagram of the received light intensity processing apparatus of the shape measuring apparatus in Embodiment 1 of this invention. FIG. 9 is a plan view of a main part of a light receiver of the shape measuring apparatus according to the second embodiment of the actual condition of the present invention. It is a top view of the shape measuring apparatus in the form 3 of the actual condition of this invention. It is a side view of the shape measuring apparatus in the form 3 of the present invention. FIG. 13 is a plan view of a main part of a light emitter / receiver of a shape measuring apparatus according to a fourth embodiment of the present invention. It is a top view of the shape measuring device in the form 5 of the actual condition of this invention. It is a figure which shows the example of the light reception intensity distribution by the shape measuring device in the form 5 of the actual condition of this invention. It is a top view of the shape measuring device in the form 6 of the actual condition of this invention. It is a figure for demonstrating the detection of the fluctuation of the pattern of reflection intensity by the shape measuring device in the form 6 of the actual condition of this invention. 9 is a flowchart for explaining the operation of the shape measuring apparatus according to Embodiment 6 of the present invention when determining whether or not measurement is possible.

  Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals. Overlapping description of the part will be simplified or omitted as appropriate.

Embodiment 1.
FIG. 1 is a configuration diagram of a main part of an elevator to which the shape measuring apparatus according to the first embodiment of the present invention is applied.

  In FIG. 1, a hoistway 1 of an elevator penetrates each floor of a building (not shown). The machine room 2 of the elevator is provided above the hoistway 1. The support structure 3 is provided on the floor surface of the machine room 2. The hoisting machine 4 is provided on the upper surface of the support structure 3.

  The sheave 5 is attached to the rotary shaft of the hoist 4. The deflector wheel 6 is rotatably attached to the support structure 3. The rope 7 is wound around the sheave 5 and the deflecting wheel 6.

  The car 8 is arranged inside the hoistway 1. The car 8 is supported on one side of the rope 7. The weight 9 is arranged inside the hoistway 1. The weight 9 is supported on the other side of the rope 7.

  In the elevator, the rope 7 is repeatedly bent by the sheave 5 and the deflecting wheel 6. At this time, friction is generated on the rope 7. Therefore, the rope 7 is worn. As a result, the outer diameter of the rope 7 is reduced. As the outer diameter of the rope 7 becomes smaller, the strength of the rope 7 decreases.

  Therefore, the outer diameter of the rope 7 is measured in the maintenance of the elevator. Based on the measurement result of the outer diameter of the rope 7, the strength and life of the rope 7 are grasped. At this time, the shape measuring apparatus 10 is used. For example, the shape measuring device 10 is fixed to the car 8 side around the sheave 5. For example, the shape measuring device 10 is fixed to the weight 9 side around the sheave 5. The shape measuring device 10 measures the outer diameter of the rope 7 that moves as the car 8 travels.

Next, the shape measuring apparatus 10 will be described with reference to FIG.
FIG. 2 is a plan view of the shape measuring apparatus according to the first mode of the present invention.

  In FIG. 2, the x direction is the arrangement direction of the plurality of ropes 7. The y direction is the axial direction of the plurality of ropes 7. The z direction is a direction orthogonal to the x direction and the y direction.

  As shown in FIG. 2, the shape measuring apparatus 10 includes a light projector 11, a half mirror 12, a retroreflector 13, a light receiver 14, and a received light intensity processing device 15.

  The floodlight 11 is arranged on the opposite side of the sheave 5 (not shown in FIG. 2) with respect to the rope 7. The light projector 11 projects parallel light having a width that exceeds at least the outer diameter of the rope 7.

  The half mirror 12 is arranged on the opposite side of the sheave 5 with respect to the rope 7. The half mirror 12 reflects a part of the parallel light. The half mirror 12 guides a part of the parallel light to the rope 7 to be measured.

  The retroreflector 13 is arranged on the sheave 5 side with respect to the rope 7. The retroreflector 13 is arranged on the opposite side of the half mirror 12 with respect to the rope 7. For example, the retroreflector 13 is a micro corner cube array. The retroreflector 13 has a retroreflective surface. The retroreflector 13 reflects in the opposite direction the light that has traveled to the opposite side of the rope 7 without being blocked by the rope 7 among the parallel light on the retroreflective surface.

  The light receiver 14 is arranged on the opposite side of the sheave 5 with respect to the rope 7. The light receiver 14 is arranged on the opposite side of the retroreflector 13 with respect to the half mirror 12. When the reflected light from the retroreflector 13 passes through the half mirror 12, the light receiver 14 does not receive any light other than the light parallel to the incident direction of the light to the retroreflector 13 among the reflected light. It receives light parallel to the incident direction of light on the reflector 13. The light receiver 14 outputs information on the received light intensity distribution corresponding to the received light.

  For example, the light receiver 14 includes a light receiving element 14a and a limited light receiving system 14b.

  The light receiving element 14a receives light. For example, the light receiving element 14a is a CCD or CMOS image element. For example, the light receiving element 14a is a line sensor in which a plurality of elements are arranged in the x direction. The light receiving element 14a outputs information on the received light intensity distribution.

  The limited light receiving system 14b does not transmit, to the light receiving element 14a, the light other than the light parallel to the incident direction of the light on the retroreflector 13 among the reflected light from the retroreflector 13. The limited light receiving system 14b transmits the light parallel to the incident direction of the light to the retroreflector 13 toward the light receiving element 14a.

  The received light intensity processing device 15 has a processing unit 15a. The processing unit 15a calculates the outer diameter value of the rope 7 based on the information of the received light intensity distribution from the light receiver 14. The processing unit 15a records information on the outer diameter value of the rope 7.

Next, the projector 11 will be described with reference to FIGS. 3 and 4.
FIG. 3 is a perspective view of a main part of the projector of the shape measuring apparatus according to the first embodiment of the present invention. FIG. 4 is a plan view of a main part of the projector of the shape measuring apparatus according to the first embodiment of the present invention.

  3 and 4, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  As shown in FIGS. 3 and 4, the projector 11 includes a light source 11a and a lens 11b.

  The light source 11a is provided so as to emit light. For example, the light source 11a is a point light source light emitting diode having a small light emitting surface size.

  The lens 11b is provided so that the light from the light source 11a becomes parallel light after being transmitted. For example, the lens 11b is a cylindrical lens. For example, the lens 11b is an aspherical lens from which spherical aberration has been removed. The lens 11b is oriented in a direction parallel to the incident direction of light on the retroreflector 13. The effective diameter of the lens 11b is set so that at least the transmitted parallel light exceeds the outer diameter of the rope 7. The lens 11b is arranged such that the focal position is on the light emitting surface of the light source 11a.

Next, the limited light receiving system 14b will be described with reference to FIGS.
FIG. 5 is a perspective view of a main part of a light receiver of the shape measuring apparatus according to the first embodiment of the present invention. FIG. 6 is a plan view of an essential part of the light receiver of the shape measuring apparatus according to the first embodiment of the present invention.

  5 and 6, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  As shown in FIGS. 5 and 6, the limited light receiving system 14 b includes a first lens 16, a slit body 17, and a second lens 18.

  The first lens 16 is oriented in a direction parallel to the incident direction of light on the retroreflector 13. The first lens 16 shapes the reflected light from the retroreflector 13 after passing through the half mirror 12 not shown in FIGS. 5 and 6. For example, the first lens 16 is a cylindrical lens. For example, the first lens 16 is an aspherical lens from which spherical aberration has been removed. The effective diameter of the first lens 16 is set to be equal to or larger than the width of the parallel light of the projector 11.

  The slit body 17 is arranged closer to the light receiving element 14a than the first lens 16. The slit body 17 has an opening having a preset width. The width of the opening affects the measurement accuracy. For example, the width of the opening is set to 100 μm or less. The slit body 17 is arranged such that the focal position of the first lens 16 is the opening. The slit body 17 blocks light other than light parallel to the incident direction of light on the retroreflector 13 when the light from the first lens 16 passes through the opening. As a result, the influence of diffracted light is removed.

  The second lens 18 is arranged closer to the light receiving element 14a than the slit body 17. The second lens 18 is oriented in a direction parallel to the incident direction of light on the retroreflector 13. The second lens 18 shapes the light that has passed through the opening of the slit body 17. For example, the second lens 18 is a cylindrical lens. The focal length of the second lens 18 and the effective system are set so that the width w of the light transmitted through the second lens 18 is equal to or less than the width of the light receiving surface of the light receiving element 14a.

Next, a method of calculating the outer diameter value of the rope 7 will be described with reference to FIGS. 7 to 10.
FIG. 7 is a perspective view of a rope to be measured by the shape measuring apparatus according to the first embodiment of the present invention. FIG. 8 is a sectional view of a rope to be measured by the shape measuring apparatus according to the first embodiment of the present invention. FIG. 9 is a diagram showing an example of received light intensity distribution by the shape measuring apparatus according to the first embodiment of the present invention. FIG. 10 is a diagram showing fluctuations in the lobe width dimension measured by the shape measuring apparatus according to the first embodiment of the present invention when the car is running.

  As shown in FIGS. 7 and 8, the rope 7 is formed by twisting a core steel 7a and a plurality of strands 7b. Therefore, when viewed from the direction orthogonal to the longitudinal direction of the rope 7, the width dimension of the rope 7 varies depending on the cross-sectional arrangement of the strands 7b.

  As shown in FIG. 9, the processing unit 15a of the received light intensity processing device 15 sets the threshold value to 50% with 100% being the amount of received light in the state where there is no foreign matter. The processing unit 15a of the received light intensity processing device 15 detects a shadow portion due to the rope 7. Specifically, the received light intensity processing device 15 detects the first edge and the second edge in which the received light amount is reduced to 50% in the received light intensity distribution. The processing unit 15a of the received light intensity processing device 15 calculates the interval between the first edge and the second edge as the width dimension D of the rope 7.

  The processing unit 15a of the received light intensity processing device 15 calculates the outer diameter value Dia of the rope 7 based on time-series information of the width dimension D of the rope 7 when the car 8 is traveling as shown in FIG. At this time, the width dimension D of the rope 7 is calculated by periodically moving up and down as the cross-sectional arrangement of the strands 7b changes. At this time, the outer diameter value Dia of the rope 7 is calculated as the upper limit value of the width dimension D of the rope 7.

  According to Embodiment 1 described above, shape measuring apparatus 10 does not receive light other than light parallel to the incident direction of light on retroreflector 13 among the reflected light from retroreflector 13. It receives light parallel to the incident direction of light on the retroreflector 13. Therefore, the influence of the diffracted light by the retroreflector 13 can be removed.

Next, an example of the received light intensity processing device 15 will be described with reference to FIG.
FIG. 11 is a hardware configuration diagram of the received light intensity processing device of the shape measuring apparatus according to the first embodiment of the present invention.

  Each function of the received light intensity processing device 15 can be realized by a processing circuit. For example, the processing circuit comprises at least one processor 19a and at least one memory 19b. For example, the processing circuit comprises at least one dedicated hardware 20.

  When the processing circuit includes at least one processor 19a and at least one memory 19b, each function of the received light intensity processing device 15 is realized by software, firmware, or a combination of software and firmware. At least one of software and firmware is described as a program. At least one of software and firmware is stored in at least one memory 19b. At least one processor 19a realizes each function of the received light intensity processing device by reading and executing a program stored in at least one memory 19b. At least one processor 19a is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP. For example, the at least one memory 19b is a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, an EEPROM, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, or the like.

  If the processing circuit comprises at least one dedicated hardware 20, the processing circuit may be implemented, for example, in a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. It For example, each function of the received light intensity processing device 15 is realized by a processing circuit. For example, each function of the received light intensity processing device 15 is collectively realized by a processing circuit.

  Part of each function of the received light intensity processing device 15 may be realized by the dedicated hardware 20, and the other part may be realized by software or firmware. For example, the function of the processing unit 15a is realized by a processing circuit as the dedicated hardware 20, and for the functions other than the function of the processing unit 15a, at least one processor 19a reads a program stored in at least one memory 19b. It may be realized by executing the following.

  In this way, the processing circuit realizes each function of the received light intensity processing device 15 by the hardware 20, the software, the firmware, or a combination thereof.

Embodiment 2.
FIG. 12 is a plan view of an essential part of a light receiver of the shape measuring apparatus according to the second embodiment of the present invention. Note that the same or corresponding parts as those of the first embodiment are designated by the same reference numerals. Description of the relevant part is omitted.

  12, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  The limited light receiving system 14b of the second embodiment is a limited light receiving system in which the second lens 18 is omitted from the limited light receiving system 14b of the first embodiment. At this time, the light receiving element 14a may be arranged at a position where the width of the reflected light transmitted through the slit body 17 is equal to or smaller than the light receiving surface size.

  According to the second embodiment described above, the second lens 18 is omitted. Therefore, the number of parts of the shape measuring apparatus 10 can be reduced.

Embodiment 3.
FIG. 13 is a plan view of the shape measuring apparatus according to the third aspect of the present invention. FIG. 14 is a side view of the shape measuring apparatus according to the third aspect of the present invention. Note that the same or corresponding parts as those of the first embodiment are designated by the same reference numerals. Description of the relevant part is omitted.

  13 and 14, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  In the first embodiment, the parallel light projected by the projector 11 is reflected on the xz plane. On the other hand, in the second embodiment, the parallel light emitted by the light projector 11 is reflected by the yz plane.

  According to the third embodiment described above, the dimension of the shape measuring device 10 in the y direction increases, but the dimension of the shape measuring device 10 in the x direction can be reduced. Therefore, it is possible to increase the degree of freedom in designing the shape measuring device 10 with respect to a complicated installation area around the sheave 5.

Fourth Embodiment
FIG. 15 is a plan view of a main part of a light emitter / receiver of the shape measuring apparatus according to the fourth embodiment of the present invention. Note that the same or corresponding parts as those of the first embodiment are designated by the same reference numerals. Description of the relevant part is omitted.

  15, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  In the shape measuring apparatus 10 of the first embodiment, the light projector 11 and the light receiver 14 are formed as separate bodies. On the other hand, in the shape measuring apparatus 10 of the fourth embodiment, the light emitter / receiver 21 is integrally formed.

  In the fourth embodiment, the light emitter / receiver 21 includes a light source 11a, a half mirror 12, a first lens 16, a retroreflector 13, a slit body 17, a second lens 18, and a light receiving element 14a which are not shown in FIG. ..

  The light source 11a casts light. For example, the light source 11a is a point light source light emitting diode having a small light emitting surface size.

  The half mirror 12 reflects a part of the light from the light source 11a. The half mirror 12 guides a part of the light to the rope 7.

  The first lens 16 is arranged on the half mirror 12 side with respect to the rope 7 not shown in FIG. The first lens 16 is arranged such that the focal position folded back by the half mirror 12 is the light emitting surface of the light source 11a. The first lens 16 shapes the light from the light source 11a into parallel light after being reflected by the half mirror 12.

  The retroreflector 13 is arranged on the opposite side of the first lens 16 with respect to the rope 7. The retroreflector 13 reflects the parallel light, which is not blocked by the rope 7 and travels to the opposite side of the rope 7, in the opposite direction.

  The slit body 17 is arranged on the opposite side of the first lens 16 with respect to the half mirror 12. The slit body 17 has an opening having a preset width. The slit body 17 blocks light other than the light parallel to the incident direction of the light on the retroreflector 13 when the reflected light from the retroreflector 13 passes through the first lens 16 and the half mirror 12.

  The second lens 18 is arranged on the opposite side of the half mirror 12 with respect to the slit body 17. The second lens 18 is oriented in a direction parallel to the incident direction of light on the retroreflector 13. The second lens 18 shapes the light from the slit body 17.

  The light receiving element 14 a is arranged on the opposite side of the slit body 17 with respect to the second lens 18. The light receiving element 14a receives no light other than the light parallel to the incident direction of the light on the retroreflector 13 among the light from the second lens 18. The light receiving element receives light parallel to the incident direction of light on the retroreflector 13.

  According to the fourth embodiment described above, the light emitter / receiver 21 is integrally formed. Therefore, not only the number of parts of the shape measuring apparatus 10 can be reduced, but also the shape measuring apparatus 10 can be downsized.

  The light emitted by the light source 11a may be folded back on the yz plane.

Embodiment 5.
FIG. 16 is a plan view of the shape measuring apparatus according to the fifth aspect of the present invention. Note that the same or corresponding parts as those of the first embodiment are designated by the same reference numerals. Description of the relevant part is omitted.

  16, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  The shape measuring apparatus 10 according to the fifth embodiment is the shape measuring apparatus 10 in which a supporting portion 13a is added to the shape measuring apparatus 10 according to the first embodiment.

  The support portion 13a is provided so that the angle of the retroreflector 13 with respect to incident light can be adjusted. For example, the support part 13a arranges the retroreflector 13 at a predetermined inclination angle α with the y direction as an axis.

Next, an example of the received light intensity distribution will be described with reference to FIG.
FIG. 17 is a diagram showing an example of received light intensity distribution by the shape measuring apparatus according to the fifth aspect of the present invention.

  When the retroreflector 13 of the micro-corner cube array is arranged orthogonal to the incident light, the reflected light intensity at a distance increases or decreases due to the diffraction phenomenon. For example, as shown in FIG. 17, the reflected light intensity pattern fluctuates. Further, the fluctuation pattern at this time changes depending on the installation position of the retroreflector 13.

  For example, when the retroreflector 13 is removed and then installed again, the position of the retroreflector 13 slightly changes. At this time, the fluctuation pattern of the reflected light intensity changes. As a result, when the light receiving intensity processing device 15 performs the processing with the threshold value, the detection positions of the first edge and the second edge change. Therefore, the measurement result of the outer diameter value Dia of the rope 7 changes.

  At this time, if the retroreflector 13 is tilted and the apparent spacing of the corner-cube array viewed from the light incident direction is narrowed, fluctuations in the reflected light intensity pattern are suppressed. On the other hand, when the inclination angle α of the retroreflector 13 is set to be large, the reflection efficiency of the retroreflector 13 decreases. On the other hand, when the inclination angle α of the retroreflector 13 is set to be 10 degrees or more and 30 degrees or less, the reflection efficiency of the retroreflector 13 does not decrease, and fluctuations in the reflected high intensity are suppressed.

  According to the fifth embodiment described above, the retroreflector 13 is installed with an inclination. Therefore, the fluctuation of the reflected light intensity pattern can be suppressed. As a result, the outer diameter value Dia of the rope 7 can be stably measured.

Sixth embodiment.
FIG. 18 is a plan view of the shape measuring apparatus according to the sixth aspect of the present invention. FIG. 19 is a diagram for explaining the detection of the fluctuation in the pattern of the reflection intensity by the shape measuring apparatus according to the sixth aspect of the present invention. The same or corresponding parts as those in the fifth embodiment are designated by the same reference numerals. Description of the relevant part is omitted.

  18, the x direction, the y direction, and the z direction are the same directions as the x direction, the y direction, and the z direction in FIG.

  As shown in FIG. 18, the received light intensity processing device 15 of the sixth embodiment includes a measurement availability determination unit 15b and a measurement availability notification control unit 15c in addition to the processing unit 15a.

  The measurement propriety determination unit 15b detects the fluctuation of the reflected light intensity pattern based on the information of the received light intensity distribution output from the light receiver 14. The measurement propriety determination unit 15b determines the measurement propriety based on the detection result of the fluctuation of the reflected light intensity pattern.

  For example, as shown in FIG. 19, the measurement propriety determination unit 15b determines a range excluding a portion obtained by adding a preset distance Δ to the shadow portion of the rope 7 as a transmission portion. The measurement propriety determination unit 15b determines the measurement propriety based on the standard deviation σ of the reflected light intensity of the transmission unit.

  The measurement propriety notification control unit 15c notifies an external device of information that prompts continuation of the measurement when the measurement is possible. The measurement propriety notification control unit 15c notifies an external device of information that prompts the reinstallation of the retroreflector 13 when the measurement is impossible.

  For example, the measurement availability notification control unit 15c causes the display device 22 to display information that prompts the worker to continue the measurement when the measurement is possible. For example, the measurement propriety notification control unit 15c causes the display device 22 to display information that prompts the worker to reinstall the retroreflector 13 when the measurement is impossible.

Next, with reference to FIG. 20, an operation of the shape measuring apparatus 10 when determining whether or not measurement is possible will be described.
FIG. 20 is a flowchart for explaining the operation of the shape measuring apparatus according to Embodiment 6 of the present invention when determining whether or not measurement is possible.

  In step S1, the received light intensity processing device 15 acquires information on the received light intensity distribution. Then, the received light intensity processing device 15 performs the operation of step S2. In step S2, the received light intensity processing device 15 extracts the shaded portion of the rope 7 based on the information on the received light intensity distribution. At this time, the received light intensity processing device 15 determines that the range excluding the portion obtained by adding the preset distance Δ to the shadow portion of the rope 7 is the transmission portion.

  Then, the received light intensity processing device 15 performs the operation of step S3. In step S3, the received light intensity processing device 15 calculates the standard deviation σ of the reflected light intensity of the transmissive portion. Then, the received light intensity processing device 15 performs the operation of step S4. In step S4, the received light intensity processing device 15 determines whether or not the standard deviation σ is greater than or equal to a specified value.

  When the standard deviation σ is equal to or greater than the specified value in step S4, the received light intensity processing device 15 performs the operation of step S5. In step S5, the received light intensity processing device 15 determines that measurement is possible. Then, the received light intensity processing device 15 ends the operation.

  When the standard deviation σ is not equal to or more than the specified value in step S4, the received light intensity processing device 15 performs the operation of step S6. In step S6, the received light intensity processing device 15 determines that measurement is impossible. Then, the received light intensity processing device 15 ends the operation.

  According to the sixth embodiment described above, the propriety of measurement is determined. When the measurement is impossible, the information prompting the reinstallation of the retroreflector 13 is notified. Therefore, it is possible to prevent the measurement accuracy from deteriorating due to the installation failure of the retroreflector 13.

  For example, as shown in FIG. 1 of the first embodiment, the retroreflector 13 is installed in a narrow space between the sheave 5 and the rope 7 where workability is poor. At this time, the inclination angle α of the retroreflector 13 may not be a desired angle due to a defective installation of the retroreflector 13. Even in this case, it is possible to notify the worker of information prompting the reinstallation of the retroreflector 13. As a result, it is possible to prevent the measurement accuracy from deteriorating due to the installation failure of the retroreflector 13.

  The shape measuring apparatus 10 according to the first to sixth embodiments may be used when measuring the shape of a measurement target other than the rope 7. Also in this case, the influence of the diffracted light by the retroreflector 13 can be removed.

  As described above, the shape measuring device according to the present invention can be used for a measuring system that removes the influence of diffracted light by a retroreflector.

  1 hoistway, 2 machine room, 3 support structure, 4 hoisting machine, 5 sheave, 6 deflector, 7 rope, 7a core steel, 7b strand, 8 basket, 9 weight, 10 shape measuring device, 11 floodlight, 11a light source, 11b lens, 12 half mirror, 13 retroreflector, 13a supporting part, 14 light receiver, 14a light receiving element, 14b limited light receiving system, 15 light receiving intensity processing device, 15a processing part, 15b measurement propriety determination part, 15c measurement Possibility notification control unit, 16 first lens, 17 slit body, 18 second lens, 19a processor, 19b memory, 20 hardware, 21 light emitter / receiver, 22 display device

Claims (11)

A projector for projecting parallel light having a width exceeding the width of the shape measurement target;
A half mirror that reflects a part of the parallel light and guides the object to be measured,
A retroreflector that is arranged on the opposite side of the half mirror with respect to the measurement target, and that reflects in the opposite direction the light that has traveled to the opposite side of the measurement target without being blocked by the measurement target in the parallel light. ,
It is arranged on the opposite side of the retroreflector with respect to the half mirror, and the reflected light from the retroreflector is incident on the retroreflector out of the reflected light after passing through the half mirror. A receiver that receives light parallel to the incident direction of light to the retroreflector without receiving light other than parallel light,
Shape measuring device equipped with. When the outer diameter value of the rope wound around the sheave of the hoisting machine provided in the machine room of the elevator is the width of the object to be measured, the floodlight is used for the rope in the vicinity of the sheave. Placed on the other side of the sheave,
The half mirror is arranged on the opposite side of the sheave with respect to the rope around the sheave,
The retroreflector is arranged on the side of the sheave with respect to the rope around the sheave,
The shape measuring device according to claim 1, wherein the light receiver is arranged on the opposite side of the sheave from the rope around the sheave. The light receiver is
A light receiving element for receiving light,
Of the reflected light from the retroreflector, light other than light parallel to the incident direction of light to the retroreflector does not pass toward the light receiving element and the incident direction of light to the retroreflector is not transmitted. A limited light receiving system that transmits parallel light toward the light receiving element,
The shape measuring apparatus according to claim 1 or 2, further comprising: The limited light receiving system is
A first lens that is oriented in a direction parallel to the incident direction of light to the retroreflector and that shapes the reflected light after the reflected light from the retroreflector passes through the half mirror;
Light directed to the retroreflector when light from the first lens passes through the opening and is arranged closer to the light receiving element than the first lens and has an opening with a preset width. A slit body that blocks light other than light parallel to the incident direction of
A second lens which is arranged closer to the light receiving element than the slit body, is oriented in a direction parallel to the incident direction of light to the retroreflector, and shapes the light passing through the opening of the slit body;
The shape measuring apparatus according to claim 3, further comprising: The limited light receiving system is
A first lens that is oriented in a direction parallel to the direction of incidence of light on the retroreflector and that shapes the reflected light after the reflected light from the retroreflector passes through the half mirror;
Light directed to the retroreflector when light from the first lens passes through the opening and is arranged closer to the light receiving element than the first lens and has an opening with a preset width. A slit body that blocks light other than light parallel to the incident direction of
The shape measuring apparatus according to claim 3, further comprising:   The shape measuring device according to claim 1, wherein the light projector is arranged side by side with the half mirror in a width direction of the measurement target.   The said light projector is arrange | positioned along with the said half mirror in the direction orthogonal to the direction of the width | variety of the said measuring object, and the direction parallel to the incident direction of the light to the said retroreflector. The shape measuring device according to item 1. A light source that casts light
A half mirror that reflects a part of the light from the light source and guides a part of the light to a measurement target,
A first lens that is arranged on the side of the half mirror with respect to the measurement target, and that shapes the light from the light source into parallel light after the light is reflected by the half mirror,
A retroreflector that is disposed on the opposite side of the first lens with respect to the measurement target, and that reflects in the opposite direction, the parallel light that has traveled to the opposite side of the measurement target without being blocked by the measurement target. When,
It is arranged on the opposite side of the first lens with respect to the half mirror and has an opening of a preset width, and the reflected light from the retroreflector passes through the first lens and the half mirror. When a slit body that blocks light other than light parallel to the incident direction of light on the retroreflector,
A second lens that is arranged on the opposite side of the half mirror with respect to the slit body, is oriented in a direction parallel to the incident direction of light to the retroreflector, and shapes the light from the slit body.
The retroreflector is disposed on the opposite side of the slit body with respect to the second lens, and does not receive light other than light parallel to the incident direction of light on the retroreflector among the light from the second lens. A light receiving element that receives light parallel to the incident direction of light to the reflector,
Shape measuring device equipped with. When the outer diameter of a rope wound around a sheave of a hoisting machine provided in a machine room of an elevator is set as the width of the measurement target, the light source is provided with respect to the rope around the sheave. Placed on the other side of the sheave,
The half mirror is arranged on the opposite side of the sheave with respect to the rope around the sheave,
The first lens is arranged around the sheave on the opposite side of the sheave with respect to the rope,
The retroreflector is arranged on the side of the sheave with respect to the rope around the sheave,
The slit body is arranged on the opposite side of the sheave with respect to the rope around the sheave,
The second lens is arranged on the opposite side of the sheave from the rope around the sheave,
9. The shape measuring device according to claim 8, wherein the light receiving element is arranged on the opposite side of the sheave from the rope around the sheave.   The shape measuring device according to claim 1, wherein the retroreflector is provided so that an angle with respect to incident light can be adjusted. The fluctuation of the pattern of the reflected light intensity is detected based on the information of the received light intensity distribution with respect to the reflected light from the retroreflector, and it is determined whether or not the measurement is possible based on the detection result of the fluctuation of the pattern of the reflected light intensity. In the case of, a received light intensity processing device for informing an external device of information prompting the re-installation of the retroreflector,
The shape measuring device according to any one of claims 1 to 10, further comprising:

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