JP2008268240A - Light reflecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light reflecting device having a reflecting part on a cone surface, wherein it is made possible to use for various purposes. <P>SOLUTION: A conical body 103 of the light reflecting device 102 has a reflecting part 104 disposed in a conical region including the top part 201 of the conical body 103, and has an annular reflecting part 106 concentrically disposed across an annular non-reflecting part 105. When light 107 from a light source 101 is projected to the top 201 side of the light reflecting device 102, the light 202 in the center part is reflected by the reflecting part 104 in the conical region to produce a circular flat light 108 to irradiate the inner face of a cylindrical member 110. Thus, the inner face of the cylindrical member 110 is irradiated with light in a linear pattern. The light 203 in the outside part is reflected on the reflecting part 103 to form a circular light 109 with a certain thickness to irradiate the inner face of the cylindrical member 110. The inner face of the cylindrical member 110 is irradiated with light in a band-like pattern. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light reflecting device that reflects light from a light source and outputs various lights.

Conventionally, in-cylinder inspection devices that optically measure the inner diameter of cylindrical members such as sewer pipes have been developed. As one method for in-cylinder inspection, measurement is performed by irradiating the inner wall of a cylindrical member with sheet-like light. The optical cutting method which performs is adopted (for example, refer to Patent Document 1).
In the light cutting method, in order to convert the light from the light source into sheet-like light and output it, a cone mirror (conical mirror) in which the vertex angle is usually 90 degrees and the entire surface of the cone is formed on the reflecting surface. Is used.

When parallel light having a small-diameter cross section is irradiated on the top of the cone mirror, the light is reflected in a perpendicular direction by the reflection surface of the cone mirror and converted into sheet-like light, and the inner surface of the cylindrical member is on the sheet. Irradiated linearly with light. The reflected light reflected from the inner surface of the cylindrical member is detected by an optical sensor, and the inner diameter of the cylindrical member is measured.
FIG. 6 is a diagram for explaining inner diameter measurement by a light cutting method using a conventional cone mirror.
In FIG. 6, in a cylindrical member 608 that is a measurement object, a cone mirror 602 having a reflection portion 603 on the entire surface of the cone and having an apex angle of 90 degrees is disposed.

A light beam 606 having a small-diameter circular cross-section is irradiated from a light source 601 such as a laser onto the reflecting portion 603 at the top of the cone mirror 602. The parallel light 606 is reflected by the top of the reflecting portion 603 and deflected by 90 degrees, and becomes a sheet-like light 607 that is irradiated on the inner surface side of the cylindrical member 608. The inner surface of the cylindrical member 608 is irradiated linearly with sheet-like light.
The linear light reflected from the inner surface of the cylindrical member 608 is detected by the optical sensor 605 via the light receiving lens 604. Based on the light detected by the optical sensor 605, the inner diameter of the cylindrical member 608 is calculated.

FIG. 7 is an explanatory diagram in the case where a conventional cone mirror is used to irradiate the inner surface of a cylindrical member with band-shaped light.
In FIG. 7, in a cylindrical member 704 that is an irradiation object, a cone mirror 602 having a reflection portion 603 on the entire surface of the cone and having an apex angle of 90 degrees is disposed.

  A parallel light 702 having a circular cross section is emitted from a light source 701 such as a laser toward the reflection portion 603 at the top of the cone mirror 602. The parallel light 702 is reflected by being bent 90 degrees by the conical region including the top of the reflecting portion 603, and becomes a disc-shaped light 703 having a predetermined uniform thickness, and is irradiated on the inner surface side of the cylindrical member 704. The inner surface of the cylindrical member 704 is irradiated with a disk-shaped light 703 in a band shape having a predetermined width.

FIG. 8 is an explanatory diagram in the case of using a conventional cone mirror to irradiate the inner surface of a cylindrical member with band-shaped light using non-parallel light.
In FIG. 8, in a cylindrical member 704 that is an irradiation object, a cone mirror 602 having a reflection portion 603 on the entire surface of the cone and having an apex angle of 90 degrees is disposed.

  A light source 801 including a laser and a lens irradiates light 802 having a circular cross section and a non-parallel light toward the reflection portion 603 on the top of the cone mirror 602. The non-parallel light 802 is reflected by a conical region including the top of the reflecting portion 603, has a predetermined non-uniform thickness (the cylindrical member 704 side is wider than the cone mirror 602 side), and becomes a circular light 803 that becomes a cylindrical member. 704 is irradiated on the inner surface side. The inner surface of the cylindrical member 704 is irradiated with a circular beam 803 in a band shape having a predetermined width.

In addition to the above-described inner diameter measurement, the cone mirror is used for applications such as use in the ink for indoor carpentry tools.
However, the cone mirror having the above-described structure has a problem that the application is limited because it can only irradiate the object with either linear light or belt-like light.

JP 2007-57305 A

  An object of the present invention is to enable use in various applications in a light reflecting device having a reflecting portion on the surface of a cone.

According to the present invention, there is provided a light reflecting device characterized in that a reflecting portion that reflects light and a non-reflecting portion that does not reflect light are provided on the surface of a cone.
The reflection part provided on the surface of the cone reflects light, and the non-reflection part does not reflect light.
Here, you may comprise so that the said reflection part and a non-reflection part may be provided concentrically centering | focusing on the top part of the said cone.
Moreover, you may comprise so that the said reflection part may be provided in the top part of the said cone.
In addition, a reflective portion is provided in a conical region including the top of the cone, and the annular non-reflective portion provided concentrically around the reflective portion sandwiches the annular reflective portion in a concentric manner. You may comprise so that it may be provided.

Moreover, you may comprise so that the length of the ridgeline direction of the reflective part provided in the said cone-shaped area | region may be shorter than the length of the said cyclic | annular reflective part in the ridgeline direction.
The conical region including the top of the cone is provided with a reflecting portion, and the annular non-reflecting portion and the annular reflecting portion are alternately provided around the reflecting portion. May be.
Further, a plurality of non-reflective portions may be provided along the ridge line of the cone so as to divide the reflective portion.

The light shielding member may include a through hole, and the light shielding member may be configured such that the through hole is disposed so as to face the top of the cone.
Further, it is configured to include a conical light reflecting member having a reflecting portion in a conical region including at least the top of the cone, and a light shielding member having a through hole disposed at a position facing the top. May be.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the light reflection apparatus which can be used for various uses.

Hereinafter, a light reflecting device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a light reflecting device according to a first embodiment of the present invention. FIG. 2 is a partially enlarged perspective view of the same part as in FIG.
1 and 2, a light reflecting device 102 according to the first embodiment is disposed in a cylindrical member 110 that is an irradiation object. A part of the cylindrical member 110 is cut away.

The light reflecting device 102 has a conical body 103 whose apex angle is a predetermined angle (90 degrees in the present embodiment) on a disk-shaped pedestal, and a reflecting portion that reflects light on the surface of the conical body 103. 104 and 106 and the non-reflective part 105 which does not reflect light are provided.
The reflection part 104 is provided in a conical region including the top part 201 of the cone 103. An annular, belt-like non-reflective portion 105 is provided around the reflective portion 104 and concentrically with the reflective portion 104.

An annular strip-like reflecting portion 106 is provided concentrically with the reflecting portion 104 with the annular non-reflecting portion 105 interposed therebetween.
The length of the reflective portion 104 provided in the conical region in the ridge line direction is shorter than the length of the annular reflective portion 106 in the ridge line direction. As an example of the dimensions, for example, the reflective portion 104 is defined as 0.2 mm along the ridge line from the top portion 201, and the non-reflective portion 105 is defined within a range of 0.2 mm to 1.2 mm from the top portion 201. A portion of 1.2 mm or more along the ridge line from the top portion 201 is a reflecting portion 106.

A light source 101 including a laser and a lens emits light 107 having a circular cross section perpendicular to the optical axis 100 and non-parallel to the optical axis 100 toward the top 201 of the light reflecting device 102. The optical axis 100 which is the center line of the light 107 output from the light source 101 is set so as to pass through the top portion 201.
The light 202 in the central portion of the non-parallel light 107 is reflected and deflected by the reflecting portion 104 that is a conical region including the top portion 201, becomes a thin sheet-like circular light 108 on the inner surface side of the cylindrical member 110. Irradiated. Since the inner peripheral surface of the cylindrical member 110 is irradiated with the circular light 108, the cylindrical member 110 is irradiated with circular light centering on the optical axis 100.

Light outside the non-parallel light 107 (light having a donut-shaped cross section) 203 is reflected and deflected by the reflecting portion 103 to have a predetermined non-uniform thickness (the cylindrical member 110 side is thicker than the cone mirror 102 side). It becomes the circular light 109 which it has, and is irradiated to the cylindrical member 110 inner surface side. Since the inner peripheral surface of the cylindrical member 110 is irradiated with the light 109, the cylindrical member 110 is irradiated with light having a band shape and an annular shape around the optical axis 100.
Of the light 107 output from the light source 101, the light between the light 202 and the light 203 is not reflected because it is applied to the non-reflecting portion 105 of the light reflecting device 102. Therefore, the inner peripheral surface of the cylindrical member 110 is irradiated in a ring shape around the optical axis 100 by one linear light and one strip light.

  According to the first embodiment, the cone 103 of the light reflecting device 102 is provided with the reflecting portion 104 in the region near the top 201 of the cone 103, and the annular reflecting portion 106 is the annular non-reflecting portion 105. Is provided concentrically with the reflector 104. When light 107 is emitted from the light source 101 toward the top portion 201 side of the light reflecting device 102, the light 202 in the central portion is reflected by the reflecting portion 104, which is a conical region, and becomes a sheet-like circular light 108, which is a cylindrical member. 110 is irradiated on the inner surface side. The inner surface of the cylindrical member 110 is irradiated linearly. The light 203 in the outer portion is reflected by the reflecting portion 103 and is irradiated on the inner surface side of the cylindrical member 110 as a circular light 109 having a predetermined thickness. The inner surface of the cylindrical member 110 is irradiated in a band shape.

As described above, the reflection portions 104 and 106 and the non-reflection portion 105 are provided concentrically around the top portion 201 of the cone 103. Since the length of the ridge line direction of the reflection part 104 provided in the conical region is configured to be shorter than the length of the annular reflection part 106 in the ridge line direction, the light reflection device 102 is used to form a linear shape. It is possible to irradiate the irradiation target with light or band-like light. Further, by changing the angle range in which the light 107 output from the light source 101 spreads, further various irradiations can be performed. Therefore, it is possible to provide a light reflecting device that can be used for various purposes.
It is possible to measure the inner diameter of the cylindrical member 110 by irradiating the sheet-like light 108 linearly, and detecting irregularities or defects on the inner surface of the cylindrical member 110 by irradiating the light 109 having a predetermined thickness in a band shape. Detection etc. become possible.

FIG. 3 is a perspective view showing a light reflecting device according to the second embodiment of the present invention.
In FIG. 3, the light reflecting device includes a conical light reflecting member 301 having a reflecting portion 303 in a conical region including at least the top 304 of the cone 302, and a light shielding member and has a small penetration at the center thereof. And a light shielding member 310 having a circular cross section having a hole (pinhole) 311.

  The plate-shaped light shielding member 310 is disposed so as to be orthogonal to the optical axis 100, and is disposed so that the center of the through hole 311 faces the top portion 304. The apex angle of the cone 302 is formed at a predetermined angle (90 degrees in the present embodiment). In addition, a reflection portion 303 is formed on the entire surface of the cone 302. Note that it is not always necessary to form the reflecting portion 303 on the entire surface of the cone 302, and the light reflecting device can be configured by using the light shielding member 310 together with the light reflecting device according to another embodiment.

A light source 101 including a laser and a lens emits light 107 having a circular cross section perpendicular to the optical axis 100 and non-parallel to the optical axis 100 toward the top 304 side of the light reflecting member 301. The optical axis 100, which is the center line of the light 107 output from the light source 101, is set so as to pass through the center of the through hole 311 and the top portion 304.
The light in the central portion of the non-parallel light 107 passes through the through-hole 311 and is reflected and deflected by the conical region 305 including the apex 304, and becomes a thin sheet-like circular light 308, which is a target object (see FIG. (Not shown). Since the object is irradiated with the circular light 308, the object is irradiated in a ring shape around the optical axis 100 with linear light.

Of the light in the outer portion of the non-parallel light 107, the light that is not shielded by the light shielding member 310 is reflected by the strip-shaped region 307 that is the outer reflective region, and becomes circular light 309 having a predetermined non-uniform thickness. To the object side. Since the object is irradiated with the circular light 309, the object is irradiated in a ring shape having a predetermined width around the optical axis 100 by the band-shaped light.
Of the light output from the light source 101, the light of the portion shielded by the light shielding member 310 does not reach the band-like region 306 of the reflecting portion 303 and is not reflected by the band-like region 306.

As described above, by configuring the light reflecting device with the light reflecting member 301 and the light shielding member 310, it becomes possible to irradiate the object with linear light or belt-shaped light.
Irradiation becomes possible. Further, by changing the angle range in which the light 107 output from the light source 101 spreads, further various irradiations can be performed.

FIG. 4 is a perspective view showing a light reflecting device according to the third embodiment of the present invention.
In FIG. 4, a conical light reflecting device 401 is provided with a reflecting portion 404 in a conical region including a top 403 of a cone 402. Further, the light reflecting device 401 is configured such that an annular non-reflecting portion 406 and an annular reflecting portion 405 are provided alternately on the surface of the cone 402 concentrically with the reflecting portion 404.
The apex angle of the cone 402 of the light reflecting device 401 is formed at a predetermined angle (90 degrees in the present embodiment).

A light 107 including a laser and a lens emits light 107 having a circular cross section perpendicular to the optical axis 100 and non-parallel to the optical axis 100 toward the top 403 side of the light reflecting device 401. The optical axis 100, which is the center line of the light 107 output from the light source 101, is set so as to pass through the top 403.
The central portion of the non-parallel light 107 is reflected and deflected by the reflection portion 404 which is a conical region including the top portion 403, and becomes a thin sheet-like circular light 407 on the object (not shown) side. Irradiated.

Further, the outer part of the non-parallel light 107 is reflected by the plurality of reflecting portions 405, and is irradiated on the object side as a thin sheet-like circular light 408.
Of the light 107 output from the light source 101, the light 107 applied to the plurality of non-reflective portions 406 is not reflected.
In this way, since the object is irradiated with the linear light reflected by the reflecting portions 404 and 405, the object is irradiated in a plurality of annular shapes around the optical axis 100 with the plurality of linear lights. It will be. By using the light reflection device 401 as the light source of the optical measurement device, a plurality of locations of the object can be irradiated simultaneously with a plurality of linear lights, so that it is possible to shorten the measurement time of the shape and the like. .

Note that at least one of the reflection portions 404 and 405 is configured to be irradiated with the band-like light by making the reflection portions 404 and 405 longer in the ridge line direction (that is, the width of the reflection portions 404 and 405 is wider). it can.
Thereby, it becomes possible to irradiate an object with linear light or belt-like light using the light reflecting device 401. Further, by changing the angle range in which the light 107 output from the light source 101 spreads, further various irradiations can be performed.

FIG. 5 is a perspective view showing a light reflecting device according to the fourth embodiment of the present invention.
In FIG. 5, a conical light reflecting device 501 includes a plurality of non-reflective portions that are radially linear from the top portion 503 of the cone 502 along the ridge line with respect to the reflecting portion formed on the entire surface of the cone 502. 505 and a plurality of concentric linear non-reflective portions 504 are provided so as to be orthogonal to the optical axis 100 with the top portion 503 as the center. Thereby, a plurality of reflecting portions 506 and 507 are formed on the surface of the cone 502.

A plurality of reflecting portions 507 are provided in a conical region including the top portion 503 of the cone 502, and a plurality of linear and annular non-reflecting portions 504 are provided around the plurality of reflecting portions 507. Further, the light reflecting device 501 is provided with a plurality of linear non-reflecting portions 505 along the ridgeline of the cone 502. As a result, a plurality of reflecting portions 506 and 507 are arranged in an aligned state on the surface of the cone 502 of the light reflecting portion 501. The plurality of reflecting portions 506 and 507 are formed in an island shape.
That is, a reflective portion is provided in a conical region including the top portion 503 of the cone 502, and an annular non-reflective portion 504 and an annular reflective portion are alternately provided around the reflective portion. A plurality of non-reflective parts 504 are provided so as to divide the reflective part along the line, thereby forming a plurality of reflective parts 506 and 507.

  Note that the intervals between the non-reflective portions 504 may all be the same, or some of the non-reflective portions 504 may be configured at a different interval from the other non-reflective portions 504. Further, the intervals between the non-reflective portions 505 may all be the same, or some of the non-reflective portions 505 may be configured at a different interval from the other non-reflective portions 505.

The apex angle of the cone 502 of the light reflecting device 501 is formed at a predetermined angle (90 degrees in this embodiment).
A light 107 including a laser and a lens is irradiated with light 107 having a circular cross section perpendicular to the optical axis 100 and non-parallel to the optical axis 100 toward the top 503 side of the light reflecting device 501. The optical axis 100 that is the center line of the light 107 output from the light source 101 is set so as to pass through the top portion 503.

The non-parallel light 107 from the light source 101 is reflected as reflected light 508 on the object (not shown) side by each reflecting portion 506. Of the light 107 output from the light source 101, the light 107 irradiated to the non-reflecting parts 504 and 505 formed between the reflecting parts 506 is not reflected.
In this way, the object is irradiated with substantially trapezoidal light reflected by the reflecting portions 506 and 507. A plurality of objects can be irradiated with the light reflected by the reflecting portions 506 and 507.

  Further, by arranging an optical shutter device having a plurality of optical shutter elements corresponding to the reflecting portions 506 and 507 between the light source 101 and the light reflecting device 501, it can function as an optical signal output device. Become. That is, by selectively opening and closing the optical shutter element, the light 107 from the light source 101 is reflected to the corresponding reflecting portions 506 and 507 via the selected optical shutter element, so that the reflected light arrives. It is possible to represent a signal according to the position where it is performed. Further, as described above, various positions can be irradiated in a spot manner.

For example, as shown in FIG. 5, a reflective surface and a non-reflective surface are constructed in the circumferential direction to form a segment of a very small area (that is, the reflective portions 506 and 507), so that optical information can be input in a non-contact manner. A mechanism that can propagate to the output side and output side is obtained. A number is assigned to each segment, and segments 0 to 50 can be used as measurement data, and segments 51 to 60 can be used as condition data and name data.
In this way, various irradiations can be performed using the light reflecting device 501.

  In each of the above embodiments, the light source 101 that outputs the non-parallel light 107 that spreads from the optical axis 100 has been described. However, a light source that outputs light parallel to the optical axis 100 is used. This makes it possible to irradiate various types of radiation.

  It can be used as a light source for measuring the inner diameter of the cylindrical member, a light source for detecting irregularities on the inner surface of the cylindrical member, a spot-like irradiation light source, a signal light source, a reflecting device that changes the traveling direction of light, and the like.

1 is a perspective view of a light reflecting device according to a first embodiment of the present invention. It is a partial expansion perspective view of the light reflecting device concerning a 1st embodiment of the present invention. It is a perspective view of the light reflection apparatus which concerns on the 2nd Embodiment of this invention. It is a perspective view of the light reflection apparatus which concerns on the 3rd Embodiment of this invention. It is a perspective view of the light reflection apparatus which concerns on the 4th Embodiment of this invention. It is a perspective view which shows the usage condition of the conventional light reflection apparatus. It is a perspective view which shows the usage condition of the conventional light reflection apparatus. It is a perspective view which shows the usage condition of the conventional light reflection apparatus.

Explanation of symbols

101 ... Light source 102, 401, 501 ... Light reflection device 103, 302, 402, 502 ... Conical body 104, 106, 303, 404, 405, 506, 507 ... Reflector 105, 406, 504, 505 ... non-reflective portions 107 to 109, 202, 203, 308, 309, 407, 408, 508 ... light 110 ... cylindrical members 201, 304, 403, 503 ... top 301 ... Light reflecting member 305: conical regions 306, 307 ... belt-like region 310 ... light shielding member 311 ... through hole

Claims (9)

  A light reflecting device comprising a conical surface provided with a reflecting portion for reflecting light and a non-reflecting portion for not reflecting light.   The light reflecting device according to claim 1, wherein the reflecting portion and the non-reflecting portion are provided concentrically around the top of the cone.   The light reflecting device according to claim 1, wherein the reflecting portion is provided on a top portion of the cone.   A reflection part is provided in a conical region including the top of the cone, and the annular reflection part is provided concentrically with the non-reflection part provided in a concentric circle around the reflection part. The light reflecting device according to claim 3, wherein   5. The light reflecting device according to claim 4, wherein the length of the reflecting portion provided in the conical region in the ridge line direction is shorter than the length of the annular reflecting portion in the ridge line direction.   The reflective part is provided in a conical region including the top of the cone, and the annular non-reflective part and the annular reflective part are alternately provided around the reflective part. Item 4. The light reflecting device according to Item 2 or 3.   The light reflecting device according to claim 6, wherein a plurality of non-reflecting parts are provided so as to divide the reflecting part along a ridge line of the cone. A light shielding member having a through hole;
8. The light reflecting device according to claim 1, wherein the light shielding member is disposed so that the through hole faces a top portion of the cone. 9.   A cone-shaped light reflecting member having a reflecting portion in a conical region including at least a top portion of a cone, and a light shielding member having a through hole disposed at a position facing the top portion. Light reflection device.

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