JP2009300085A - Surface property measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface property measuring instrument capable of variously altering the incident angle of the light source part of the surface property measuring instrument which photographs a reflected image to measure surface properties and the light detecting angle of the fixed imaging element of a digital camera or the like and capable of simply performing the adjustment thereof steplessly. <P>SOLUTION: A semi-circular slide guide 13 is fixed to a base 1, slide elements 33 and 43 are attached to the surface of a slide guide 13 in a freely slidable manner and the digital camera 31 is fixed to one of them while the light source part 41 is fixed to the other one of them. Then, arcuate racks 51 and 61 are fixed respectively to the slide elements 33 and 43, and the slide elements 33 and 43 are moved through gears 52 and 62 and the arcuate racks 51 and 61 by the operation of a regulating knob 81 so as to rotate the light source part 41 and the digital camera 31 in mutually opposite directions by the same angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a glossy paper, printed fabric, other cloth, polished steel plate, painted surface, glass, film, ceramic, plastic, etc., such as surface roughness, gloss, transparency, etc. The present invention relates to a surface texture measuring apparatus for measuring and evaluating the surface texture of the paper, and more particularly to a surface texture measuring apparatus suitable for comprehensively measuring and evaluating the surface texture of glossy paper.

  As a means to evaluate the gloss, surface roughness, etc. of a measurement object having specular reflection surfaces such as glossy paper, cloth, polished steel plate, painted surface, etc., shine light on the measurement object, visually or by a light receiver, or A method of measuring glossiness and the like using a digital camera or the like and an apparatus therefor have been conventionally known.

  For example, JISZ8741 stipulates a method for measuring the specular gloss of a surface that is macroscopically smooth for industrial products. This method measures the amount of light received with the same incident angle and light receiving angle, and calculates the ratio of the received light amount to the standard value. A light beam with a specified opening angle is incident on the sample surface. Then, a light beam with a specified opening angle reflected in the specular reflection direction is measured with a light receiver. The incident angle is regulated to 20 degrees, 45 degrees, 60 degrees, 75 degrees, and 85 degrees depending on the type of measurement object.

  And regarding the specific glossiness measuring apparatus using the measuring method of JISZ8741, the patent application (for example, refer patent document 1) of the apparatus which measures color and glossiness with one measuring apparatus, and the case of a detector are mentioned. A patent application for a portable gloss meter that presses against the surface of the object to be measured to measure the glossiness of the object to be measured (see Patent Document 2), a standard surface sample, and a measuring device so that the sample and reference data do not vary. There is known a patent application (see Patent Document 3) of an optical characteristic measurement system in which and are used as a set. In addition, the same measurement principle is used, and for the purpose of monitoring the cleaning quality after cleaning, there is also a patent application for a measuring instrument for measuring the degree of dust and dirt covering the surface (see Patent Document 4). Are known. Moreover, as a commercially available gloss meter based on JISZ8741, "Handy gloss meter <gross checker> IG-320 / IG-331" (Horiba Seisakusho), "Gloss meter GM-60 / GM-268" (Konica Minolta), etc. Are known. These commercially available glossimeters have a structure in which light emitted from a parallel light source is applied to an object to be measured and the amount of reflected light is read by a light receiver. It is used without changing the setting. Basically, the incident angle is set at 60 degrees, and the angle is switched between two or three stages as necessary.

  In addition, there is a device that measures the glossiness not only by the amount of received light based on JISZ8741, but also by measuring the glossiness by an image obtained by taking a reflected image. For example, a pattern plate is arranged facing the painted surface, and behind the pattern plate. Place the light source, project a slit pattern (reference pattern) onto the painted surface, take a reflected image with a digital camera, etc., and process the resulting image data with a computer to calculate the finished surface of the painted surface A patent application for a measuring device (see Patent Document 5) is known.

  Other than the specular reflection type glossiness measurement (specular glossiness measurement) that measures the amount of received light with the same incident angle and light reception angle as in the measurement based on JISZ8741, the light from the light source is applied to the sample surface such as a plywood floor. , And the light from the area on the sample surface is received and measured by a light receiver at an angle other than the regular reflection angle. This measurement is performed for multiple areas with different incident angles, and the measurement is based on the difference in incident angles. A patent application has also been filed in which the gloss is measured by the difference in values (see, for example, Patent Document 6).

  Further, the present applicant mainly reflects the reference pattern on the surface of a rough object having a surface that causes regular reflection, and converts the fluctuation of the reflection angle due to the unevenness of the reflection surface into the fluctuation of the virtual image pattern on the surface of the virtual image. The virtual image pattern is photographed with a CCD camera, the image signal is processed with a computer, the luminance distribution of the reflected image (virtual image pattern) is obtained, and the fluctuation of the reflected image is calculated as the standard deviation of the luminance distribution. From the correlation diagram between the standard deviation of the luminance distribution and the surface roughness, the surface properties of the rough object, that is, the roughness of the surface (surface roughness), the directionality of the surface unevenness, the surface reflectance, etc. are contactless. In addition, a technology that enables quantitative, high-precision and simple measurement has been developed, and a patent application has been filed (see Patent Document 7). This technique is not a measurement based on the amount of received light, but a specular reflection type surface texture measurement that measures the surface texture from an image obtained by taking a reflected image, and is mainly a rough object having a surface that causes specular reflection, such as a stainless steel plate, Superiority as a technology for accurately, quantitatively and easily measuring various surface properties of stainless steel sheets, such as metal plates, plastic molded products, ceramic products (tiles, etc.), glass products, painted products, plated products, etc. Is big. In addition, this technique illuminates the reference pattern with a light source, projects a reflected image of the reference pattern on the surface of the object to be measured, and shoots it. There is no problem caused by light diffraction as in the case of projecting light from behind.

  In addition, as a more advantageous technique for comprehensively evaluating the surface properties of rough objects, the applicant applies illumination to a ring-shaped reference pattern and projects the reflected image on the surface of the measurement object. The reflection image is picked up, the standard deviation of the amplitude of the luminance distribution of the image data on a plurality of (for example, 64) lines extending in the radial direction from the center of the image is obtained, and the relative value with the standard deviation of the reference mirror surface is expressed as “mirror surface”. Defined as “degree” (image sharpness), and the image clarity (whether the image is accurately captured) is evaluated from the specularity (a reference value of 1000, for example) for a plurality of lines. Has invented a method for comprehensively evaluating surface properties such as surface roughness and glossiness caused by microscopic irregularities, and has applied for a patent (see Patent Document 8).

JP-A-8-29258 JP-A-9-145618 JP 2006-153498 A Special Table 2002-533717 JP-A-61-75236 JP 2001-264251 A JP 2001-99632 A JP 2007-155709 A

  In recent years, the number of printers used has increased due to the spread of computers and digital cameras, and the amount of printer paper used has increased accordingly. In particular, the demand for glossy paper used as printer paper has increased due to the spread of digital cameras. In addition, the quality required for glossy paper as printer paper has become high. For this reason, the importance of quality control in the production stage of glossy paper such as printer paper has increased, and in particular, it is possible to comprehensively and accurately measure and evaluate the surface properties such as surface roughness, gloss, and transparency of glossy paper. It is important.

  However, the measurement based on JISZ8741 is to measure the glossiness (specular glossiness) from the amount of light received by specular reflection (specular reflection) with the same incident angle and light reception angle. With this, it is difficult to comprehensively evaluate the surface properties such as surface roughness, gloss, and transparency of glossy paper. In the case of glossy paper as printer paper, it is difficult to comprehensively and accurately evaluate the surface properties that reflect the quality of the printed results when actually used by measuring the glossiness based solely on the amount of light received. Not enough results for management.

  In this regard, the method of measuring and evaluating the surface properties by taking an image of the projected or reflected reference pattern, processing the data with a computer, and converting it into a numerical value is based on the image actually connected to the surface of the measurement object. Because of the measurement, it is possible to accurately measure the surface properties of glossy paper as printer paper, and to obtain results that meet the requirements of quality control.

  However, the optimum incident angle for pattern projection differs slightly depending on the type of glossy paper. Also, even with the same type of glossy paper, the sharpness of imaging differs slightly depending on the incident angle. Therefore, in order to accurately measure and evaluate the surface properties that reflect the quality of glossy paper print results, adjust the incident angle according to the type of glossy paper to obtain the optimum incident angle, and simultaneously adjust the receiving angle. Need to shoot at the optimal angle.

  On the other hand, none of the conventional surface property measurement methods (and apparatus) for analyzing the pattern projection image is intended to change the incident angle arbitrarily and variously, and it is possible in practice. It is not configured as such. Conventional glossiness measurement methods or apparatuses using received light amount, including the measurement method according to JISZ8741, do not change the incident angle and the received light angle arbitrarily and variously.

  In order to comprehensively and accurately measure and evaluate the surface properties that reflect the quality of glossy paper print results, it is necessary to adjust the incident angle and the light reception angle according to the type of glossy paper and shoot at the optimum angle. In order to do so, it is necessary to be able to change the incident angle and the light receiving angle in various ways, and to perform the adjustment steplessly and easily. By making it possible to change the incident angle and the light receiving angle in a variety of ways and to make adjustments in a stepless and simple manner, it becomes possible to accurately measure the surface properties of glossy paper at the manufacturing stage. When the surface properties that reflect the quality of glossy paper print results are comprehensively and accurately measured and evaluated by measuring the surface properties by analyzing the projected image, the superiority becomes remarkable.

  In addition to glossy paper, in order to measure and evaluate the surface properties of printed fabrics, for example, comprehensively and accurately, the incident angle and the light receiving angle can be changed in various ways, and the adjustment can be performed in a stepless and simple manner. The advantage of this is great. In addition, for rough surfaces with surfaces that cause specular reflection, such as cloth, polished steel plates, painted surfaces, glass, films, ceramics, plastics, etc. Further, the advantage of being able to change the light receiving angle in various ways and to easily perform the adjustment steplessly is great.

  Accordingly, it is possible to provide a surface texture measuring apparatus that can change the incident angle and the light receiving angle in various ways and can easily adjust the surface texture in a stepless and simple manner when measuring the surface texture of the reflected image. It is a problem to be able to measure and evaluate the surface properties of rough objects such as glossy paper comprehensively and accurately by measuring the surface properties by analyzing the image of the above. An object of the present invention is to solve this problem.

  The surface texture measuring device of the present invention can measure at an arbitrary angle position by changing the incident angle of the light source unit with respect to the measurement surface and the light receiving angle of the fixed image sensor (a fixed image sensor such as a digital camera or an area image sensor). The light source unit and the fixed imaging device (a fixed imaging device such as a digital camera or an area image sensor) are provided with guide means that can move on a concentric circumference symmetrically with respect to the perpendicular to the measurement surface and simultaneously steplessly. And

  This surface texture measuring device can change the incident angle and the light receiving angle in various ways, and can easily adjust it steplessly, so it can measure at the optimum angle according to the type of object to be measured. Since it can be measured not by measuring the amount of light received but by the image actually bound on the surface of the measurement object, glossy paper, printed fabric, other cloth, polished steel plate, painted surface, glass, film, It is possible to accurately measure and evaluate surface properties such as surface roughness, gloss, and transparency of objects to be specularly reflected, such as ceramics and plastics. It is easy to quantify and comprehensively evaluate the surface properties of the measurement object that requires accurate judgment.

  More specifically, the surface texture measuring apparatus uses, for example, a semicircular sliding guide and two sliders that can slide on the sliding guide as guide means, An arc rack is attached to the child, and each arc rack is meshed with each other and is swung in opposite directions by a pair of gears with a gear ratio of 1: 1 so that each slider is at an arbitrary position on the slide guide. It is preferable that a light source unit is attached to one of the sliders, and a fixed image sensor (a fixed image sensor such as a digital camera or an area image sensor) is attached to the other slider. By doing so, for example, it is possible to adjust both the incident angle and the light receiving angle at the same time and by the same amount by operating the adjusting knob. Also, in this case, the arc center position of the semicircular sliding guide that is the rotation trajectory of the light source unit and the fixed image sensor (a fixed image sensor such as a digital camera or an area image sensor) is set to the lower outside of the apparatus base, By lowering the position where the image is formed, it is possible to place a measurement object having a wide surface under the apparatus base and measure a part of the measurement object.

  In this surface texture measuring apparatus, in particular, the light source unit projects a pattern image on the measurement surface, and the pattern image projected on the measurement surface is fixed by a fixed image sensor (a fixed image sensor such as a digital camera or an area image sensor). It is preferable to take a picture and process the obtained video signal with a computer to measure the surface property of the measurement surface. By doing so, it becomes possible to comprehensively and more accurately measure and evaluate the surface properties that reflect the quality of printed results on glossy paper, especially for glossy paper as printer paper, and to reflect the surface properties that reflect the quality of printed results. It is possible to measure and evaluate comprehensively and accurately, and to obtain results that meet the requirements of quality control.

  As described above, according to the surface texture measuring apparatus of the present invention, the incident angle and the light receiving angle can be changed in various ways, and the adjustment can be performed steplessly and easily. In particular, the image of the pattern projection is analyzed. By measuring the surface properties according to the above, the surface properties of rough objects such as glossy paper can be comprehensively and accurately measured and evaluated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an example (first example) of an embodiment of the present invention. 1 is an external perspective view of the surface texture measuring apparatus, and FIG. 2 is an exploded perspective view of the surface texture measuring apparatus shown in FIG.

  In the surface texture measuring apparatus shown in this example, a fulcrum shaft 2 is fixed to the center of the lower part of the standing wall portion of an L-shaped bookend-shaped base 1 (apparatus base) so as to protrude substantially vertically forward. A pair of swing levers 3 and 4 of the same size and shape are mounted on the shaft 2 so as to be swingable by fulcrum boss portions 3a and 4a provided at one end portions thereof. A pair of adjustment levers 5 and 6 are provided at each end of the pin portions 3b and 4b provided at the ends opposite to the fulcrum bosses 3a and 4a of the swing levers 3 and 4, respectively. The pin bosses 5a and 6a are rotatably mounted on the shafts, and the bolts 5b and 6b provided at the ends of the adjusting levers 5 and 6 opposite to the pin bosses 5a and 6a are coaxially stacked and penetrated. The adjusting bolt 8 is inserted into an elongated hole 11 formed in the upper center of the standing wall portion of the base 1 in the vertical direction, and is screwed with a fixing nut 12 fitted into the elongated hole 11 from the rear side of the standing wall portion. By loosening the screwing with the fixing nut 12, it can be moved to any upper and lower positions between the upper limit position and the lower limit position regulated by the elongated hole 11, and fixed at that position by tightening the screwing with the fixing nut 12. It can be done. The long hole 11 is provided on a line perpendicular to the bottom surface of the base 1 and passing through the fulcrum shaft 12. The distance between the fulcrum boss portions 3a, 4a of the swing levers 3, 4 and the pin portions 3b, 4b and the distance between the pin boss portions 5a, 6a of the adjustment levers 5, 6 and the bolt boss portions 5b, 6b are all the same. is there.

  A digital camera 31 that is a fixed imaging element is attached to one (left side in the illustrated example) swing lever 3, and a light source 41 is attached to the other swing lever 4.

  The light source unit 41 includes a cylindrical holding case 42, a light source lamp 40, a lens 44 and a slit plate 45 housed in the holding case 42, and a leg that supports the holding case 42 and is fixed to the swing lever 4. Part 46.

  In the surface texture measuring apparatus of this embodiment, the measuring unit 10 is configured with the above-described members as main components. A sample stage 7 is installed along the front surface of the measurement unit 10. The sample stage 7 is made so that the height can be adjusted. The height of the sample stage 7 is adjusted so that the upper surface of the sample T, which is the measurement object placed on the upper surface, coincides with the center of the fulcrum shaft 2. Adjust.

  In this surface texture measuring device, a light beam emitted from the light source lamp 40 of the light source unit 41 is converted into a parallel light beam by the lens 44, passes through the slit plate 45, and passes through the opening 47 provided in the front surface of the cylindrical case 42. A projected image V (pattern image) of the slit plate 45 is projected on the surface of A. At this time, the adjusting bolt 8 is slightly loosened and moved up and down along the elongated hole 12 while being guided by the fixing nut 12 so that the angles of the left and right rocking levers 3 and 4 can be steplessly simultaneously and symmetrically. Can be changed. Then, the adjustment bolt 8 is tightened in a state where the projected image V of the slit plate 45 is more clearly projected on the surface of the sample T, and the rocking levers 3 and 4 are fixed, so that the light beam from the light source 41 is incident on the sample T. Fix the corners. At this time, the light receiving angle of the digital camera 31 is also fixed at the same angle as the incident angle. In this state, the projection image V of the slit plate 45 is photographed by the digital camera 31, and the photographed image data is processed by a computer (not shown) to evaluate the surface property of the sample T.

  In this embodiment (first example), the surface texture measuring apparatus can change the incident angle and the light receiving angle in various ways and can easily adjust them steplessly. Therefore, the surface texture measuring device can measure at the optimum angle according to the type of the measurement object. In addition, it is not only measured by the amount of light received, but can be measured by the image actually bound on the surface of the object to be measured, so glossy paper, printed fabric, other cloth, polished steel plate It is possible to accurately measure and evaluate the surface properties such as the surface roughness, gloss, and permeability of a measurement object having a surface that causes specular reflection, such as a painted surface, glass, film, ceramic, plastic, etc. It has a great advantage in quantifying and comprehensively evaluating the surface properties of objects to be measured that require delicate judgments such as glossy paper and printed fabrics.

  In particular, the light source unit 41 projects a pattern image on the measurement surface, the pattern image projected on the measurement surface is photographed by a digital camera, and the obtained video signal is processed by a computer to determine the surface properties of the measurement surface. By measuring, it becomes possible to comprehensively and more accurately measure and evaluate the surface properties that reflect the quality of glossy paper print results, especially for glossy paper as printer paper, the surface properties that reflect the quality of print results. It is possible to measure and evaluate comprehensively and accurately, and obtain results that meet the requirements of quality control.

  3 to 6 show another example (second example) of the embodiment of the present invention. 3 is an external perspective view of the surface texture measuring apparatus, FIG. 4 is an explanatory view showing the structure of the surface texture measuring apparatus shown in FIG. 3 in a horizontal section, and FIG. 5 is a mechanism for changing the angle of the surface texture measuring apparatus shown in FIG. FIG. 6 is an explanatory diagram showing an example of measurement by the surface texture measuring device shown in FIG.

  In the surface texture measuring apparatus shown in this example, a semicircular sliding guide 13 is fixed to the front surface of a standing wall portion of an L-shaped bookend-shaped base 1 (apparatus base). On the sliding guide 13, two sliders 33 and 43 are slidably attached along the guide surface of the sliding guide 13. A digital camera 31 that is a fixed imaging device is fixed to one (left side in the illustrated example) slider 33, and a light source unit 41 is fixed to the other slider 43.

  The sliding guide 13 is set so that its arc center position P is located outside the bottom of the base 1 (see FIG. 6).

  The light source unit 41 includes a cylindrical holding case 42, a light source lamp 40 accommodated in the holding case 42, a lens 44, and a slit plate 45, and the holding case 42 is fixed to the slider 43. .

  Further, the sliders 33 and 43 are respectively arc racks so as to face each other from the left and right at positions sandwiched between the digital camera 31 and the light source unit 41 on the radially inner side of the slide guide 13. 51 and 61 are fixed.

  The arc-shaped racks 51 and 61 are arc-shaped, rack gears are formed on the radially inner surface, and the arc center position thereof coincides with the arc center position P of the sliding guide 13 (see FIG. 5).

  Further, the arc rack 61 (on the right side in the illustrated example) fixed to the slider 43 on the light source unit 41 side is fixed to the slider 43 via a spacer 63, and the thickness of the spacer 63 is increased. The arrangement is shifted forward relative to the arc rack 51 of the side (left side in the illustrated example) fixed to the slider 33 on the digital camera 31 side (see FIG. 4).

  Then, a pair of gears 52 and 62 having a gear ratio of 1: 1 meshing with the pair of arc racks 51 and 61, respectively, mesh with each other so that the base 1 and the base 1 are located near the lower center of the base 1. The bearing frame 14 is mounted so as to be freely rotatable via a bearing between the bearing frame 14 and the bearing frame 14 (see FIG. 4).

  Further, the gear 52 that meshes with the arc rack 51 fixed to the slider 33 on the digital camera 31 side (left side in the illustrated example) has a shaft portion extending beyond the back surface of the base 1, and the outer side of the back portion of the base 1. An adjustment knob 81 is fixed to the tip of the shaft portion located at the position. By rotating the adjustment knob 81, the left and right arc racks 51, 61 are rotated through the gears 52, 62 by the same angle in the opposite directions as indicated by arrows A or B in FIG. And the digital camera 31 can be moved steplessly by the same angle in opposite directions. Therefore, by setting the incident angle (θ) of the light source unit 41 and the initial value angle of the light receiving angle (θ ′) of the digital camera 31 to be the same, the adjustment knob 81 is operated and the incident angle (θ) and the light receiving angle ( Both θ ′) can be changed simultaneously and by the same amount, and can be changed to an arbitrary angle within a mechanically set range while always maintaining the same angle. For example, the measurement angle can be easily reproduced by attaching a scale indicating the rotation angle of the adjustment knob 81 to the side surface of the base 1.

  In this surface texture measuring device, the light emitted from the light source lamp 40 of the light source unit 41 becomes parallel light by the lens 44, passes through the slit plate 45, and passes through the opening 47 provided on the front surface of the cylindrical case 42. Further, when it is provided on the bottom surface of the base 1, a projected image V (pattern image) of the slit plate 45 is projected on the surface of the sample T through the opening window 15. Therefore, the projection image S of the slit plate 45 is captured by the digital camera 31 in a state where the adjustment knob 81 is operated to adjust the incident angle (θ) and the light receiving angle (θ ′). The surface property of the sample T can be evaluated by processing the captured image data with a computer (not shown).

  Further, in this surface texture measuring device, the arc center position P of the semicircular sliding guide 13 which is the rotation trajectory of the light source unit 41 and the digital camera 31 is located outside the bottom surface of the base 1, as shown in FIG. The projection image V is formed at a position lower than the bottom surface of the base 1 by a distance H. Therefore, in the case of the thick sample T, as shown in FIG. An adjustment plate S having the same thickness t as the sample T may be placed under the leg 16. In addition, when the measurement object is large and has a wide surface, the measurement can be performed by directly installing the apparatus on the surface.

  Further, in this embodiment, the sliding guide 13 serving as the rotation trajectory of the light source unit 41 and the digital camera 31 is configured as an integral part made of a single-radius arc, but the rotation trajectory of the light source unit 41 is configured. The part that constitutes the rotation locus of the digital camera 31 can be separated from each other, and can be constituted by two sliding guides having the same arc center and different radii.

  The surface texture measuring apparatus of this embodiment (second example) can change the incident angle and the light receiving angle in various ways, and can easily adjust it steplessly, so it can measure at the optimum angle according to the type of measurement object. In addition, it is not only measured by the amount of light received, but can be measured by the image actually bound on the surface of the object to be measured, so glossy paper, printed fabric, other cloth, polished steel plate It is possible to accurately measure and evaluate the surface properties such as the surface roughness, gloss, and permeability of a measurement object having a surface that causes specular reflection, such as a painted surface, glass, film, ceramic, plastic, etc. It has a great advantage in quantifying and comprehensively evaluating the surface properties of objects to be measured that require delicate judgments such as glossy paper and printed fabrics.

  In particular, the light source unit 41 projects a pattern image on the measurement surface, the pattern image projected on the measurement surface is photographed by the digital camera 31, and the obtained video signal is processed by a computer to obtain surface properties of the measurement surface. By measuring the surface quality, it becomes possible to comprehensively and more accurately measure and evaluate the surface properties that reflect the quality of glossy paper print results. Especially for glossy paper as printer paper, the surface properties that reflect the quality of print results. Can be measured and evaluated comprehensively and accurately, and results in line with quality control requirements can be obtained.

  This surface texture measuring device uses a semicircular sliding guide 13 and two sliders 33 and 43 as guide means, and arc racks 51 and 61 are attached to the sliders 33 and 34, respectively. Then, the arcuate racks 51 and 61 are engaged with each other by a pair of gears 52 and 62 having a gear ratio of 1: 1, and the sliders 33 and 43 are moved on the slide guide 13. The light source unit 41 is attached to one of the sliders, and the digital camera 31 is attached to the other slider 43. Both acceptance angles can be adjusted to change simultaneously and by the same amount.

  In addition, the surface texture measuring device sets the arc center position P of the semicircular sliding guide 13 that is the rotational trajectory of the light source unit 41 and the digital camera 31 to the lower side outside the base 1, and the distance from the bottom surface of the base 1. Since the projection image V is formed at a position lowered by H, it is also possible to place a measurement object having a wide surface under the apparatus base and measure a part thereof.

  While the embodiments have been described with reference to two examples, the present invention can be implemented in various other ways.

  For example, in the above embodiment, the light from the light source is applied to the slit plate from behind, the slit pattern is projected onto the measurement surface, the reflected image is taken, and the obtained image data is processed by a computer to measure the surface properties. In addition to that, the light source unit is configured to illuminate the reference pattern by printing, etc., and reflect the reflected image on the surface of the object to be measured. Processing by a computer may be performed to obtain the luminance distribution of the reflected image, calculate the standard deviation of the luminance distribution, and evaluate the surface property of the measurement object based on the standard deviation of the luminance distribution.

  In addition, a light source unit is used so that a ring-shaped reference pattern in which a plurality of rings are concentrically printed or engraved is used, and this ring-shaped reference pattern is illuminated and its reflection image is reflected on the surface of the measurement object. And obtaining the standard deviation of the amplitude of the luminance distribution of the image data on a plurality of (for example, 64) lines extending in the radial direction from the center of the image by taking this reflected image, and the relative value with the standard deviation of the reference mirror surface Is defined as “specularity” (image sharpness), and the image clarity (whether the image is accurately captured) is evaluated from the specularity (a reference value of 1000, for example) for multiple lines. Thus, surface properties such as surface roughness and glossiness due to minute unevenness on the surface may be evaluated.

  The present invention can also be applied to an apparatus that directly applies light from a light source to the surface of a measurement symmetrical object without using a reference pattern, and takes a reflected image to measure the surface property. As the fixed image sensor, an area image sensor or the like can be used in addition to a digital camera. Moreover, organic EL etc. can also be used for a light source.

1 is an external perspective view of a surface texture measuring apparatus according to a first example of an embodiment of the present invention. It is a disassembled perspective view of the surface texture measuring apparatus shown in FIG. It is an external appearance perspective view of the surface texture measuring apparatus which concerns on the 2nd example of embodiment of this invention. It is explanatory drawing which shows the structure of the surface texture measuring apparatus shown in FIG. 3 in a horizontal cross section. It is explanatory drawing which shows the mechanism of angle change of the surface texture measuring apparatus shown in FIG. It is explanatory drawing which shows the example of the aspect of a measurement by the surface texture measuring apparatus shown in FIG.

Explanation of symbols

1 base (device base)
2 fulcrum shafts 3, 4 oscillating lever 5, 6 adjusting lever 7 sample base 8 adjusting bolt 10 measuring part 11 long hole 12 fixing nut 13 sliding guide 14 bearing frame 15 opening window 16 leg 31 digital camera 33, 43 slider 40 Light source lamp 41 Light source part 42 Holding case 44 Lens 45 Slit plate 47 Opening 51, 61 Arc rack 52, 62 Gear 63 Spacer 81 Adjustment knob P Arc center position S Adjustment plate T Sample (measurement object)
V Projection image (pattern image)
θ Incident angle θ ′ Light receiving angle

Claims (3)

The light source unit and the fixed image sensor are symmetric with respect to the perpendicular to the measurement surface on the concentric circle so that the incident angle of the light source unit with respect to the measurement surface and the light receiving angle of the fixed image sensor can be changed and measured at an arbitrary angle position. And a surface texture measuring apparatus comprising a guide means that can be moved steplessly at the same time. As the guide means, a semicircular sliding guide and two sliders that can slide on the sliding guide are used, and arc racks are attached to the respective sliders, and the arc racks are mutually connected. And a pair of gears having a gear ratio of 1: 1 are meshed with each other in a direction opposite to each other so that each slider can be moved to an arbitrary position on the sliding guide. The surface texture measuring device according to claim 1, wherein the fixed image pickup device is attached to the other slider. The light source unit projects a pattern image on the measurement surface, the pattern image projected on the measurement surface is photographed by the fixed imaging device, and the obtained video signal is processed by a computer to measure the surface properties of the measurement surface. The surface texture measuring device according to claim 1 or 2, wherein the surface texture measuring device is a surface texture measuring device.

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