JP2011180116A - Light projector for trolley wire measuring, and trolley wire measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light projector for trolley wire measuring which is improved so as to project sufficient light quantity regardless of its small size. <P>SOLUTION: This light projector uses a monochromatic light source consisting of a plurality of light emitting diode (LED) groups 2a-2n arranged at least in 2 rows along transverse direction of a rail 21 to collect outgoing beam from 2 rows of each LED group on the trolley wire sliding surface 20a to irradiate it over a deflection range of the trolley wire 20. Further it uses collimate lenses 65a-65n to convert the light output from a plurality of LED groups 2a-2n arranged at least in one row along transverse direction of the rail into the regularly-flared light, and then uses a linear Fresnel lens 60 to convert the converted light into the one with a condensing waist around the trolley wire sliding surface 20a, collecting the light on the trolley wire sliding surface 20a to irradiate it. Thereby difference with intensity of sunlight can be enlarged enough, allowing reflection stronger than daytime sunlight in light intensity to be generated from the trolley wire sliding surface without using any light source which generates strong laser beam. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a trolley wire measurement light projecting device and a trolley wire measurement device for projecting measurement light when measuring the wear amount and displacement amount of a trolley wire, and particularly, a small size but sufficient light amount is projected. The present invention relates to a trolley wire measurement light projecting device and a trolley wire measurement device.

  The train vehicle on the train track obtains the required power from the trolley line via the pantograph upper surface (sliding plate). It is known that the lower surface (sliding surface or sliding surface) of the trolley wire and the upper surface of the pantograph are gradually worn by sliding contact with each other. The trolley wire is alternately displaced in the left-right direction for each supporting power pole so that the wear on the pantograph side does not concentrate on a part. The amount of wear and displacement of the trolley wire are regularly measured by a trolley wire measuring device mounted on a test vehicle or the like and inspected as good or bad.

As this trolley wire measuring device, a rotating polyhedral mirror (polygon mirror) is rotated on a horizontal plane, the laser beam reflected from the rotating polyhedral mirror is irradiated onto the trolley wire, and the trolley wire is scanned over its deflection range. There is something to do. That is, the reflected light from the trolley wire sliding surface obtained in response to the scanning of the laser beam is received by the light receiving element through the perforated mirror to obtain a detection signal for the trolley wire sliding surface, The amount of wear of the trolley wire is measured by calculating the generation width of the detection signal obtained in this way with a data processing device. Japanese Patent Application Laid-Open No. 2004-151867 describes a test vehicle equipped with such a trolley wire wear amount measuring apparatus.
Further, Patent Document 2 discloses a trolley wire wear amount detection optical system that can be mounted on the roof of a business vehicle widely from the Shinkansen to the subway.
For calculating the wear amount of the trolley wire wear amount measuring device, an image is taken by a CCD camera, the width of the trolley wire sliding surface is obtained by image processing, and the wear amount is measured from this. It is described in Patent Document 3. Patent Documents 4 to 5 describe that a reflection signal from a trolley wire sliding surface is obtained, the width of the trolley wire sliding surface is obtained from the waveform, and the wear amount is calculated therefrom.

JP 2001-59710 A JP 2007-24683 A JP-A-5-96980 Japanese Patent Laid-Open No. 5-34113 JP-A-10-194015

Usually, the amount of wear on the trolley wire is measured at night, but it may be necessary to measure it not only at night but also in the daytime. In this connection, the trolley wire wear amount measuring device described in Patent Document 1 uses a solid-state laser (such as a diode YAG laser) as a light source for irradiating the trolley wire with laser light, and reflects reflected light from the trolley wire even under sunlight. It is designed to receive light. Furthermore, the trolley wire wear amount measuring device requires a scanning system including a polygon mirror in order to cover the displacement range of the trolley wire that is alternately displaced in the left-right direction as a detection range. It is getting bigger.
Although the thing of patent document 2 is devising the width | variety and arrangement | positioning of a laser light source, the width | variety of a reflective mirror, and its arrangement | positioning so that it can mount on the roof of a business vehicle, it is directly on the roof of a vehicle. Due to the mounting, there is a problem that the center of gravity of the vehicle becomes high, and the vehicle body shakes and lacks stability during running. In addition, there is a problem in that the positional relationship between the trolley wire sliding surface and the trolley wire wear amount measuring optical system is shifted due to the movement of the vehicle, and the amount of reflected light from the trolley wire is reduced.

  This invention is made in view of the above-mentioned point, Comprising: It aims at providing the trolley line measurement light projection apparatus and trolley line measurement apparatus which can project sufficient light quantity, though it is small. .

The first feature of the trolley wire measurement light projecting device according to the present invention is that the trolley wire measurement light projection irradiates a slit-like light projection onto a region corresponding to the deflection range of the trolley wire that changes along the rail. In the apparatus, a plurality of light emitting diode groups arranged in at least two rows along the transverse direction of the rail, and light emitted from each of the light emitting diode groups is condensed and adjacent to the trolley wire sliding surface. By providing a condensing lens group for concentrating light emitted from the light emitting diode groups for two rows at a predetermined position on the trolley wire sliding surface, the slit-shaped light projecting light is provided immediately before each of the light emitting diode groups. And a projection optical system for irradiating.
A monochromatic light source composed of a plurality of light emitting diode groups arranged in at least two rows along the rail crossing direction when irradiating the trolley wire with slit-shaped projection light over the trolley wire deflection range , By condensing and irradiating the emitted light from each group of light emitting diodes for two adjacent rows to a predetermined position on the trolley wire sliding surface, the difference from the intensity of sunlight can be sufficiently increased, Even without using a light source that generates strong laser light, reflected light that is stronger than the light intensity of daytime sunlight can be generated from the trolley wire sliding surface. This eliminates the need for a rotary scanning optical system using a polygon mirror or the like, which has been required in the past, makes it possible to reduce the size of the light projecting system, and to mount the trolley wire measuring light projecting device on the roof of the vehicle. .

A second feature of the trolley line measurement light projecting device according to the present invention is the trolley wire measurement light projection device according to the first feature, wherein the light projecting optical system includes a light emitting diode group. By disposing the optical axis of the condenser lens group with respect to the vertical optical axis in a direction perpendicular to the arrangement direction of the light emitting diode groups, light emitted from the light emitting diode groups for the two rows is transmitted to the trolley line. The present invention is configured such that the slit-shaped projection light is collectively irradiated onto a predetermined position of the sliding surface.
This is a method in which the light axes of the light emitting diode group and the condenser lens group are shifted as a method of concentrating the light emitted from the light emitting diode groups for two rows at a predetermined position on the trolley wire sliding surface. Thereby, the reflected light stronger than the light intensity of daytime sunlight can be generated from the trolley wire sliding surface using the light emitting diode which is a monochromatic light source.

  A third feature of the trolley wire measurement light projecting device according to the present invention is that the trolley wire measurement light projection irradiates a slit-like light projection onto a region corresponding to the deflection range of the trolley wire that changes along the rail. In the apparatus, a plurality of light emitting diode groups arranged in at least one row along the transverse direction of the rail, and a light emitted from each of the light emitting diode groups is provided in front of each of the light emitting diode groups. A collimating lens means group for converting the light into a spread of light and a linear Fresnel lens means for converting the light that has passed through the collimating lens means group into light having a condensing waist near the sliding surface of the trolley line. There is.

  According to a fourth feature of the trolley wire measurement light projecting device of the present invention, in the trolley wire measurement light projection device according to the third feature, the collimating lens means group includes a light emitting diode group. The emitted light is spread and converted into light having an angle of about 10 degrees. The linear Fresnel lens means has a focal length of about 270 [mm], and the light from the light emitting diode group is converted to the trolley line sliding surface. It is to be converted into light having a condensing waist in the vicinity.

  The first feature of the trolley wire measuring device according to the present invention is that the region corresponding to the deflection range of the trolley wire that changes along the rail is irradiated with slit-like projection light, and is irradiated by the projection light. In the trolley wire measuring device that receives reflected light reflected from the sliding surface of the trolley wire and measures the state of the sliding surface of the trolley wire, a plurality of rows arranged in at least two rows along the transverse direction of the rail The light emitted from each of the light emitting diode groups and the light emitting diode groups is condensed on the trolley wire sliding surface and the light emitted from two adjacent light emitting diode groups on the trolley wire sliding surface. A light-projecting optical system for irradiating the slit-shaped light projection is provided by providing a condenser lens group that aggregates at a predetermined position immediately before each of the light-emitting diode groups. This relates to an invention of a trolley wire measurement device using the trolley wire measurement light projecting device described in the first feature.

  A second feature of the trolley wire measurement device according to the present invention is that, in the trolley wire measurement device according to the first feature, the light projecting optical system is configured so that the vertical optical axis of each of the light emitting diode groups is By arranging the optical axis of the condensing lens group to be shifted in a direction orthogonal to the arrangement direction of the light emitting diode groups, light emitted from the light emitting diode groups for the two rows is arranged at a predetermined position on the trolley line sliding surface. Further, it is configured to irradiate as the slit-shaped projection light. This relates to an invention of a trolley wire measurement device using the trolley wire measurement light projecting device described in the second feature.

  A third feature of the trolley wire measurement device according to the present invention is that the region corresponding to the deflection range of the trolley wire that changes along the rail is irradiated with slit-like light projection light and irradiated by the light projection light. In the trolley wire measuring apparatus that receives reflected light reflected from the sliding surface of the trolley wire and measures the state of the sliding surface of the trolley wire, a plurality of rows arranged in at least one row along the transverse direction of the rail A plurality of light emitting diode groups, a collimating lens means group that is provided immediately before each of the light emitting diode groups, and converts light emitted from each of the light emitting diode groups into light having a predetermined spread, and the collimating lens means The slit-shaped projection using a projection optical system comprising linear Fresnel lens means for converting light that has passed through a group into light having a condensing waist near the trolley line sliding surface The is to irradiate the sliding surface of the contact wire. This relates to an invention of a trolley wire measurement device using the trolley wire measurement light projecting device described in the third feature.

  A fourth feature of the trolley wire measurement apparatus according to the present invention is the trolley wire measurement device according to the third feature, wherein the collimating lens means group spreads light emitted from each of the light emitting diode groups. The linear Fresnel lens means has a focal length of about 270 [mm], and a light collecting waist is formed near the sliding surface of the trolley line. It is to convert it into light. This relates to an invention of a trolley wire measurement device using the trolley wire measurement light projecting device described in the fourth feature.

  According to the present invention, there is an effect that a sufficient amount of light can be projected while being small.

It is a figure explaining the measurement principle of the measurement optical system of this invention. It is side surface explanatory drawing of an overhead wire inspection vehicle carrying the trolley wire wear amount measuring apparatus using the measurement optical system shown in FIG. It is a plane schematic diagram which removes the top plate of the trolley wire wear amount measuring apparatus and shows an internal structure. 4A and 4B are diagrams illustrating a schematic configuration of a light projecting unit constituting the measurement optical system illustrated in FIG. 2. FIG. 4A is a perspective view of the overall configuration of the light projecting unit, and FIG. It is a figure which shows typically the mode of the condensing state of light projection while showing the cross-sectional shape of the light projection unit of (A). It is the figure which looked at the overhead wire inspection vehicle carrying the trolley wire measurement light projection apparatus of another Example of the trolley wire measurement apparatus which concerns on one embodiment of this invention from the side surface. It is a plane schematic diagram which removes the top plate of the trolley wire measuring apparatus of FIG. 5 and shows an internal structure. It is a figure which shows schematic structure of the light emitting diode projector of FIG.5 and FIG.6.

  FIG. 1 is a diagram showing the principle of a trolley wire measurement device according to the present invention, and shows an outline of a measurement optical system. The measuring optical system of the trolley wire measuring apparatus includes a light projecting unit 2, an imaging lens 3, a light receiving unit 4, a pulse driving circuit 5, and a light receiving signal processing unit 6. The light projecting unit 2 irradiates the trolley wire 20 with monochromatic light having a specific wavelength in the range of infrared light through the focusing lens 3a. The light receiving unit 4 receives the reflected light from the trolley wire 20 through the imaging lens 3. In FIG. 1, an arrow line L <b> 1 obliquely toward the upper right indicates schematically the light projected from the light projecting unit 2. The wavelength of the monochromatic light emitted from the light projecting unit 2 is, for example, λ = 850 [nm]. Moreover, the arrow line L2 which goes to the lower right diagonally shows the reflected light from the sliding surface 20a of the trolley wire 20 typically. Hereinafter, they are expressed as the projection light L1 and the reflected light L2.

  The light receiving unit 4 is a light receiver constituted by a CCD line sensor, and receives the reflected light L2 in the entire light wavelength region of the photosensitivity characteristic of the CCD. The entire light wavelength region usually has a gentle mountain-shaped peak characteristic in the range of 300 nm to 1000 nm, covers the visible light region, and reaches the infrared light region. The pulse driving circuit 5 drives the light projecting unit 2 in pulses to turn on / off the light L1 emitted from the light projecting unit 2 at a predetermined cycle to generate pulsed light. Then, a synchronization signal SYN for pulse driving corresponding to a predetermined cycle is sent to the received light signal processing unit 6. Here, pulsed light is generated by pulse driving the light projecting unit 2, but a shutter mechanism is provided immediately before the light projecting unit 2, and the light projecting light L1 is controlled by opening / closing the shutter mechanism. Pulsed light may be generated. The received light signal processing unit 6 includes an A / D conversion circuit 16, a waveform data memory 17, and an arithmetic device 18. The detection signal of the trolley wire sliding surface calculated by the arithmetic device 18 is sent to the measuring device 19 as a digital value.

  FIG. 2 is a side view of an overhead wire inspection vehicle equipped with a trolley wire measurement device using the measurement optical system shown in FIG. In FIG. 2, the trolley wire measurement device 10 is installed on the upper surface 23 of the vehicle roof of the overhead wire inspection vehicle 22. The trolley wire measurement device 10 includes a measurement optical system, a trolley wire height detection mechanism 7 and a measurement optical system controller 8 as shown in FIG. The measurement optical system includes a light projecting unit 2, an imaging lens 3, a line sensor camera 9 functioning as a light receiving unit, a measurement optical system control unit 8 having a function of a pulse drive circuit, and a light reception signal processing unit. .

  As shown in FIG. 1, the light projecting unit 2 includes a plurality of n monochromatic light sources (light emitting diode groups) 2a, 2b,..., 2n arranged in the transverse direction of the rail 21 (the depth direction of the paper surface). Is done. The monochromatic light sources 2a, 2b,..., 2n intermittently generate monochromatic light in the infrared region as slit-shaped projection light. The projecting light L1 of the projecting unit 2 generates reflected light on the sliding surface 20a of the trolley wire 20 that is stronger than the light intensity in the infrared region of daytime sunlight. Usually, since the light intensity in the infrared region of sunlight during the daytime is not high, if the distance between the trolley wire 20 and the light projecting unit 2 is about 2 m, this can be achieved by using a monochromatic light LED.

  This light receiving unit is composed of a line sensor camera 9 configured to incorporate a CCD line sensor. The imaging lens 3 is provided in front of the line sensor camera 9. Similar to the light projecting unit 2, the array line of the light receivers of the CCD line sensor constituting the line sensor camera 9 serving as the light receiving unit is along the transverse direction of the rail 21 (the depth direction of the paper surface). The trolley wire measuring device of FIG. 2 includes a light receiving optical system for introducing reflected light from the sliding surface 20 a of the trolley wire 20 to the line sensor camera 9. The light receiving optical system includes a rotating mirror 12, folding reflection mirrors 13a and 13b that return reflected light in the incident direction, and a mirror moving mechanism 14 that moves the folding reflection mirrors 13a and 13b back and forth (in the horizontal direction of the paper surface). Is done. This light receiving optical system is controlled according to the reflection angle of the reflected light L2 so as to guide the change of the reflected light L2 from the sliding surface 20a that changes according to the height of the trolley wire 20 to the line sensor camera 9. It has become. The light projecting unit 2 is also mounted on the rotary table 15, and the incident angle thereof is adjusted so that the light projecting light L1 follows the height of the sliding surface 20a that changes according to the height of the trolley wire 20. To be controlled.

  FIG. 3 is a schematic plan view of the trolley wire measuring device of FIG. 2 with the top plate removed and its internal structure viewed from above. The light receiving optical system shown in FIG. 3 differs from FIG. 2 in that the reflection mirrors 13a and 13b and the mirror moving mechanism 14 are omitted for convenience of explaining the relationship of the divided light reception of the line sensor camera 9, and the trolley line The line sensor camera 9 (9a, 9b, 9c) is provided at the tip of the reflected light L2 and is directly received without reflecting the reflected light L2 from 20.

  As shown in FIG. 3, the light projecting unit 2 shown in FIG. 2 includes a plurality of monochromatic light sources (light emitting diodes / LED light emitters) 2 a, 2 b,. 3 is arranged so as to generate a slit-like light beam L. The width of the rail 21 in the transverse direction (vertical direction in FIG. 3) is configured such that the projection light L1 to the trolley line 20 covers the deviation range (about 700 [mm]) of the trolley line 20. ing. The light emitted from the monochromatic light sources (LED light emitters) 2a, 2b,..., 2n is applied to the trolley wire 20 as a slit-shaped light beam L through the slit shaping condenser lens 2P.

  The rotating mirror 12 of the light receiving optical system reflects the reflected light L2 in the transverse direction of the rail 21 (up and down direction in FIG. 3) in order to receive the reflected light L2 in the deflection range (about 700 [mm]) of the trolley wire 20. It is installed as a mirror with a length that can receive light. In the drawing, the rotation driving mechanism of the rotating mirror 12 is not shown, but the rotating shaft 12a is fixed to the back surface of the rotating mirror 12, and the rotating shaft 12a is driven by a driving means such as a stepping motor. In FIG. 3, the line sensor camera 9 includes three line sensor cameras 9a, 9b, and 9c. The reflected light L2 from the sliding surface 20a of the trolley wire 20 is received by being divided into three parts by the three line sensor cameras 9a, 9b, 9c. In addition, the mutual light receiving boundary regions overlap between the line sensor cameras 9a, 9b, and 9c. In this way, the field of view of the displacement range of the trolley wire 20 can be covered with the three line sensor cameras 9a, 9b, 9c. Note that the number of divided light receiving cameras may be a plurality, and is not limited to three.

  In FIG. 2, the trolley wire height detection mechanism 7 includes a roller contact 7 a that contacts the trolley wire 20, a turning arm 7 b that is formed by link connection of two arms, and this turning arm. The angle detector 7c detects the rotation angle in the vertical direction of the link on the root side of the arm 7b by a potentiometer. As a height detector configured to detect the height of the trolley wire 20 based on the angle of the rotating arm 7b using this type of potentiometer, for example, JP-A-7-120228, etc. The detailed description is omitted here.

  In FIG. 2, the projection light L <b> 1 from the light projecting unit 2 to the trolley wire 20 is applied to the sliding surface 20 a of the trolley wire 20 through the glass window 10 b provided on the roof frame 10 a of the trolley wire measuring device 10. The The reflected light L2 from the trolley wire 20 passes through the glass window 10b, passes through the rotating mirror 12 and the folding reflecting mirrors 13a and 13b, and then the line sensor camera 9 (three line sensor cameras 9a, 9b and 9c shown in FIG. 3). Are received in one of the visual fields and received as an image (one-dimensional waveform data) including the sliding surface 20a of the trolley wire 20. The glass window 10b is attached to the roof frame 10a at an angle of about 10 ° with respect to the horizontal plane of the roof frame 10a of the trolley wire measuring device 10. The height of the roof frame 10a is actually at a position sufficiently lower than the lower limit height at which the trolley wire 20 is displaced up and down. As a result, the position of the glass window 10b is lowered, and the trolley wire measuring device 10 can be installed with little effect on the height of the roof of the vehicle.

  In FIG. 2, the measurement optical system control unit 8 receives the trolley line height signal output from the angle detector 7 c of the trolley line height detection mechanism 7, and receives the rotary table 15 of the light projecting unit 2 and the rotary mirror 12. Then, even if the height of the trolley line 20 is changed by controlling the mirror moving mechanism 14, the image of the trolley line 20 (one-dimensional waveform data) is collected in the field of view of the line sensor camera 9. Follow-up control is performed according to the height. The measurement optical system control unit 8 is provided with a control data table 8a for follow-up control with respect to the height of the trolley wire 20. In the control data table 8a, the angle value of the rotary table 15, the angle value of the rotary mirror 12, and the movement amount of the mirror moving mechanism 14 are stored as control values corresponding to the detection values of the angle detector 7c. Yes. These control values are obtained in advance by analyzing the angle values of the rotary table 15 and the rotary mirror 12 and the movement amount of the mirror moving mechanism 14 in accordance with the height of the trolley wire 20.

  The rotary table 15, the rotary mirror 12, and the mirror moving mechanism 14 each incorporate an encoder (not shown) that detects the current angle and moving position, and each is driven and controlled by a stepping motor (not shown). It has become so. Each encoder signal is input to the measurement optical system controller 8. The measurement optical system control unit 8 controls the rotary table 15, the rotary mirror 12, and the mirror moving mechanism 14 with reference to the control data table 8a, so that the line sensor is controlled regardless of the change in the height of the trolley wire 20. Control is performed so that an image (one-dimensional waveform data) of the sliding surface 20a of the trolley wire 20 is received within the field of view of the camera 9 (three line sensor cameras 9a, 9b, 9c).

  The line sensor camera 9 (three line sensor cameras 9a, 9b, 9c) is composed of a digital camera having an A / D converter therein. Therefore, the A / D conversion circuit 16 necessary for the received light signal processing unit in FIG. 1 is omitted in FIG. The digital values of the one-dimensional images output from the three line sensor cameras 9a, 9b, and 9C are read in parallel, and the two CCDs constituting each line sensor camera 9 are simultaneously and serially synchronized. The data are sequentially output, and the reading process is continuously repeated. The digital values of the one-dimensional images of the three line sensor cameras 9a, 9b, and 9c are output to the waveform data memory 17 and stored in the respective areas of the waveform data memory 17 as one-dimensional image data. The waveform data memory 17 has a built-in controller for writing / reading, and functions as a push-down buffer memory that pushes down stored data and stores the latest waveform data at the head. Accordingly, a fixed amount is temporarily stored, and the digital values of the old one-dimensional image that overflowed from the last storage position are sequentially discarded. The temporary storage capacity is set in relation to the processing time of the arithmetic device 18.

  The waveform data of each one-dimensional image stored in the waveform data memory 17 is sequentially read out and processed by the arithmetic unit 18 constituted by a DSP or the like, and is erased sequentially after the processing. The image of the sliding surface 20a (one-dimensional image data) in the reflected light L2 received by the three line sensor cameras 9a, 9b, and 9c in three divisions is processed as waveform data, and its peak value p is detected, and the peak A level that is substantially ½ of the level is calculated. With the calculated half level as a reference, binarization processing is performed in which a level higher than this is set to “1” and a level lower than that is set to “0”, and the waveform data is calculated as digital value data. Is done. The result is stored in an internal memory (not shown) of the arithmetic unit 18. In the digital value data, the width of the trolley wire sliding surface 20a converted to the distance is calculated based on the number of pixels where “1” continues, and the width of the trolley wire sliding surface 20a is digital. A value is output to the measuring device 19. The measuring device 19 has an MPU, a memory, and the like inside, and based on the width of the trolley wire sliding surface 20a calculated by the arithmetic device 18 by executing a predetermined processing program stored in the memory by the MPU. The amount of wear is calculated.

  4 is a diagram showing a schematic configuration of a light projecting unit constituting the measurement optical system shown in FIG. 2, and FIG. 4 (A) shows a perspective view of the overall configuration of the light projecting unit, and FIG. 4 (B). These are figures which show typically the mode of the condensing state of floodlight while showing the cross-sectional shape of the floodlight unit of FIG. 4 (A). The light projecting unit 2 constructs a light projecting optical system that irradiates slit-shaped light, and includes a rectangular parallelepiped housing 24, a monochromatic light source mounting board 25 provided in the housing 24, The condensing lens groups 26 a to 26 n and 27 a to 27 n provided on the front surface of the housing 24, that is, the projection light emitting side surface, and the condensing lens groups 26 a to 26 n and 27 a to 27 n are held by the front surface portion of the housing 24. Lens holder groups 28a to 28n and 29a to 29n. The monochromatic light source mounting substrate 25 is a group of light emitting diodes arranged in at least two rows in the vertical direction along the rail crossing direction (left and right direction of the paper surface of FIG. 4A, depth direction of the paper surface of FIG. 4B). 2a to 2n are mounted on one surface portion. The light emitted from each of the light emitting diode groups 2a to 2n arranged in two rows is condensed on the trolley wire sliding surface 20a, and the light emitted from the light emitting diode groups 2a to 2n for two adjacent rows is arranged on the trolley line. It is collected at a predetermined position (irradiation range A1) of the sliding surface 20a, and is provided immediately before each corresponding light emitting diode group 2a to 2n by lens holder groups 28a to 28n and 29a to 29n.

  As shown in FIG. 4B, a group of light emitting diodes serving as a monochromatic light source arranged in two rows along the rail crossing direction (the depth direction of the paper surface in FIG. 4B) on the monochromatic light source mounting board 25. The light irradiated from 2a to 2n is collected in the irradiation range A1 by the condenser lens groups 26a to 26n and 27a to 27n provided on the front surface thereof. The optical axes D1 of the condenser lens groups 26a to 26n corresponding to the light emitting diode groups 2a to 2n in the upper row are at positions shifted downward from the optical axes C1 of the light emitting diode groups 2a to 2n in the upper row. The light emitted from the light emitting diode groups 2a to 2n in the column is collected so as to cover the irradiation range A1. On the other hand, the optical axes D2 of the condenser lens groups 27a to 27n corresponding to the light emitting diode groups 2a to 2n in the lower row are at positions shifted upward from the optical axes C2 of the light emitting diode groups 2a to 2n in the lower row, The light emitted from the light emitting diode groups 2a to 2n in the lower row is collected so as to cover the irradiation range A1. That is, the arrangement relationship between the upper and lower row light emitting diode groups 2a to 2n and the condenser lens groups 26a to 26n and 27a to 27n is the irradiation range of the upper row light emitting diode groups 2a to 2n that are the respective monochromatic light sources. L3 and the optical axes of the light emitting diode groups 2a to 2n in the upper row and the lower row so that the irradiation range L4 by the light emitting diode groups 2a to 2n in the lower row is within the irradiation range A1 on the trolley wire sliding surface 20a. C1 and C2 and the optical axes D1 and D2 of the condenser lens groups 26a to 26n and 27a to 27n are shifted from each other in the vertical direction. As shown in FIG. 4A, the optical axes of the lower light emitting diode groups 2a to 2n are positioned between the optical axes of the upper light emitting diode groups 2a to 2n. The light emitting diode groups 2a to 2n in the lower row are each configured to supplement light between the optical axes.

  FIG. 5 is a side view of an overhead wire inspection vehicle equipped with a trolley wire measurement light projecting device of another example of the trolley wire measurement device 10 according to one embodiment of the present invention. FIG. 6 is a schematic plan view showing the internal structure of the trolley wire measuring device 10 of FIG. 5 with the top plate removed. 5 and 6, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted. 7 is a diagram showing a schematic configuration of the light-emitting diode projector of FIGS. 5 and 6, FIG. 7A is a perspective view showing the overall configuration, and FIG. 7B is a short direction of the light-emitting diode projector. It is a side view which shows the light distribution image. The trolley wire measuring device 10 of FIGS. 5 and 6 is different from that of FIG. 2 in that the light from the light emitting diode groups 2a to 2n, which are surface emitting monochromatic light sources, is trolleyed by the collimating lenses 65a to 65n and the linear Fresnel lens 60. This is a point that is measured with a condensing point at the line detection position 61. In addition to this, the trolley wire measuring device 10 in FIGS. 5 and 6 is different from that in FIG. The mirror 51 is controlled by the measurement optical system controller 8, and an external light filter 55 that cuts off the external light wavelength included in the reflected light L2 is provided in front of the imaging lens 3 so that the reflected light L2 can be easily measured. This is the point. The incident angle of the projection angle adjusting mirror 51 is controlled by the measurement optical system control unit 8 so that the projection light L1 follows the height of the sliding surface 20a that changes according to the height of the trolley line 20. It has become so.

  The light-emitting diode projector 50 constructs a light-projecting optical system that irradiates slit-shaped light, and is a mounting substrate in which light-emitting diode groups 2a to 2n that are monochromatic light sources (infrared LEDs) are mounted on one surface portion. 69, a heat sink 63 for releasing heat generated by the light emitting diode groups 2a to 2n, collimating lenses 65a to 65n provided on the mounting substrate 69 so as to cover the light emitting diode groups 2a to 2n for condensing, and linear And a Fresnel lens 60. The divergence angle of the collimating lenses 65a to 65n is about 10 degrees, and the focal length (f value) of the linear Fresnel lens 60 is about 270 [mm]. As a result, as shown in FIG. 7B, the surface emitting light emitted from the light emitting diode groups 2a to 2n, which are monochromatic light sources on the mounting substrate 69, is converted into a parallel light beam by the collimating lenses 65a to 65n. The linear Fresnel lens 60 provides a light beam (projected light) L1 having a condensing waist near the trolley wire sliding surface 20a (distance of about 1700 [mm]). Thereby, the reflected light stronger than the light intensity of daytime sunlight can be generated from the trolley wire sliding surface using the light emitting diode which is a monochromatic light source.

  According to this embodiment, there is an effect that the light projecting unit 2 or the light emitting diode projector 50 can be reduced in size and the amount of light can be increased. In particular, if infrared light monochromatic light is used as the light emitting diode groups 2a to 2n, the difference from the intensity of sunlight increases, and there is no need to provide a light source that generates strong laser light. Moreover, when irradiating monochromatic light to the trolley wire over the range of deflection of the trolley wire, it is only necessary to arrange multiple light sources in the rail transverse direction, and use multiple lenses in the optical axis direction of the monochromatic light source. Therefore, there is no need for a rotary scanning optical system such as a polygon mirror, and the projection system can be downsized. As a result, the trolley wire wear amount detection optical system can be mounted on the roof of the vehicle. Reflected light whose projected light is stronger than the light intensity of sunlight during the daytime is generated on the trolley wire sliding surface. In addition, the tilt generated by the movement of the vehicle can cope with the influence of the tilt on the arrangement relationship between the trolley wire sliding surface and the trolley wire measuring optical system.

  In the embodiment of FIGS. 2 and 3, the case where the light emitting diodes that are monochromatic light sources are arranged in two upper and lower rows has been described. However, one row or a plurality of rows of three or more rows may be arranged. In the embodiment of FIGS. 5 and 6, the case where light emitting diodes that are monochromatic light sources are arranged in one row has been described, but a plurality of rows of two or more rows may be arranged. This makes it possible to increase the amount of irradiation light. Furthermore, in the above-described embodiment, the case where the line sensor camera 9 is configured by the three line sensor cameras 9a, 9b, and 9c has been described. However, the present invention is not limited to this, and the number of cameras is not limited to this. It may be configured. The number of light-emitting diodes that are monochromatic light sources shown in the figure is an example, and the number of the light-emitting diodes may be appropriately changed according to the distance between the monochromatic light source and the irradiation range.

C1, C2 ... Optical axis D1, D2 ... Optical axis L1 ... Projection light A1, L3, L4 ... Irradiation range 10 ... Trolley line measuring device 10a ... Roof frame 10b ... Glass window 12 ... Rotating mirror 12a ... Rotating axis 13a ... Reflection Mirror 14 ... Mirror moving mechanism 15 ... Rotary table 16 ... A / D conversion circuit 17 ... Waveform data memory 18 ... Arithmetic device 19 ... Measuring device 2 ... Projection unit L2 ... Reflected light 20 ... Trolley wire 20a ... Trolley wire sliding surface DESCRIPTION OF SYMBOLS 21 ... Rail 22 ... Overhead inspection vehicle 24 ... Housing 25 ... Monochromatic light source mounting board 26a-26n, 27a-27n ... Condensing lens group 28a-28n, 29a-29n ... Lens holder group 2a-2n ... Light emitting diode group 2P ... Slit shaping condenser lens 3 ... imaging lens 3a ... converging lens 4 ... light receiving unit 5 ... pulse drive circuit 6 ... light receiving signal processor 7 ... trolley line height detecting mechanism 7a ... Roller contact 7b ... rotating arm 7c ... angle detector 8 ... measurement optical system controller 8a ... control data tables 9, 9a, 9b, 9c ... line sensor camera 50 ... light emitting diode projector 51 ... projection angle adjusting mirror 55 ... External light filter 60 ... Linear Fresnel lens 61 ... Trolley line detection position 63 ... Heat sinks 65a to 65n ... Collimate lens 69 ... Mounting substrate

Claims (8)

In the trolley wire measurement light projecting device that irradiates slit-shaped light projecting into a region corresponding to the deflection range of the trolley wire that varies along the rail,
A plurality of light emitting diode groups arranged in at least two rows along the transverse direction of the rail;
The light emitted from each of the light emitting diode groups is condensed on the trolley line sliding surface, and the light emitted from two adjacent light emitting diode groups is concentrated on a predetermined position of the trolley line sliding surface. A light projecting apparatus for measuring a trolley line, comprising: a light projecting optical system that irradiates the slit light projecting light by providing a lens group immediately before each of the light emitting diode groups.   The trolley-line measuring light projecting device according to claim 1, wherein the light projecting optical system has an optical axis of the condenser lens group with respect to a vertical optical axis of the light emitting diode group, and the light emitting diode group. By disposing in a direction orthogonal to the arrangement direction, the light emitted from the light emitting diode groups for the two rows is collected and irradiated as a slit-like light projecting on a predetermined position of the trolley wire sliding surface. A trolley wire measuring light projecting device, characterized in that it is configured as described above. In the trolley wire measurement light projecting device that irradiates slit-shaped light projecting into a region corresponding to the deflection range of the trolley wire that varies along the rail,
A plurality of light emitting diode groups arranged in at least one row along the transverse direction of the rail;
A collimating lens means group that is provided immediately before each of the light emitting diode groups, and converts light emitted from each of the light emitting diode groups into light having a predetermined spread;
And a linear Fresnel lens means for converting light having passed through the collimating lens means group into light having a condensing waist near the trolley line sliding surface.   4. The trolley line measuring light projecting device according to claim 3, wherein the collimating lens means group converts light emitted from each of the light emitting diode groups into light having a divergence angle of about 10 degrees, and the linear Fresnel lens. The means has a focal length of about 270 [mm], and converts light from the light emitting diode group into light having a condensing waist near the sliding surface of the trolley line. Floodlight device. A slit-shaped projection light is irradiated to a region corresponding to the deflection range of the trolley wire that changes along the rail, and the reflected light reflected from the sliding surface of the trolley wire irradiated by the projection light is received. In the trolley wire measuring device that measures the state of the sliding surface of the trolley wire,
A plurality of light emitting diode groups arranged in at least two rows along the transverse direction of the rail;
The light emitted from each of the light emitting diode groups is condensed on the trolley line sliding surface, and the light emitted from two adjacent light emitting diode groups is concentrated on a predetermined position of the trolley line sliding surface. A trolley wire measuring apparatus comprising: a light projecting optical system that irradiates the slit-shaped light projecting by providing a lens group immediately before each of the light emitting diode groups.   6. The trolley wire measuring apparatus according to claim 5, wherein the light projecting optical system has an optical axis of the condenser lens group with respect to a vertical optical axis of each of the light emitting diode groups, and an arrangement direction of the light emitting diode groups. Arranged so that the light emitted from the light emitting diode groups for the two rows is gathered and irradiated as the slit-shaped projection light on a predetermined position of the trolley wire sliding surface by being shifted in an orthogonal direction. A trolley wire measuring device characterized by that. A slit-shaped projection light is irradiated to a region corresponding to the deflection range of the trolley wire that changes along the rail, and the reflected light reflected from the sliding surface of the trolley wire irradiated by the projection light is received. In the trolley wire measuring device that measures the state of the sliding surface of the trolley wire,
A plurality of light emitting diode groups arranged in at least one row along the transverse direction of the rail;
A collimating lens means group that is provided immediately before each of the light emitting diode groups, and converts light emitted from each of the light emitting diode groups into light having a predetermined spread;
The slit-shaped projection light is projected using a projection optical system comprising linear Fresnel lens means for converting light that has passed through the collimating lens means group into light having a condensing waist near the trolley line sliding surface. A trolley wire measuring apparatus irradiating the sliding surface of the trolley wire.   The trolley wire measuring device according to claim 7, wherein the collimating lens means group converts light emitted from each of the light emitting diode groups into light having a divergence angle of about 10 degrees, and the linear Fresnel lens means includes: A trolley wire measuring apparatus having a focal length of about 270 [mm] and converting light from the light emitting diode group into light having a condensing waist near the trolley wire sliding surface.

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