JP2008032675A - Surface roughness measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface roughness measuring apparatus for simply and accurately measuring a surface roughness on a measured surface including a curved surface. <P>SOLUTION: An apparatus housing 2 includes a measurement section 7, a position monitoring optical system 3, a measuring optical system 4, a calculation unit 5, a display unit 13, and a perception unit 14. A measuring person holds the apparatus housing 2, and presses the measurement section 7 to the measured surface S of a press die, and swings the apparatus housing 2 around a measurement region A as a supporting point. When the calculation unit 5 uses the position monitoring optical system 3 and senses the apparatus housing 2 in a measurement position, it automatically starts a calculation of the surface roughness on the measured surface S based on an output signal from the measuring optical system 4, informs the measuring person of the started calculation by using the perception until 14, and displays the calculated surface roughness on the display unit 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a surface roughness measuring apparatus capable of easily measuring the surface roughness of a surface to be measured such as a press die, on site.

As a surface roughness measuring device for measuring the surface roughness (surface state) of a metal member or the like, for example, as described in Patent Document 1, a device using laser light is known. In this surface roughness measuring apparatus, laser light is incident on a surface to be measured by a light emitting element, the reflected light is received by a light receiving element, and the intensity distribution of the received light, that is, reflected light by unevenness of the surface to be measured. The surface roughness of the surface to be measured is calculated based on the scattering state. Thus, by measuring the surface roughness of the surface to be measured optically using laser light, accurate measurement can be performed in a short time.
JP 2000-111493 A

  However, the conventional surface roughness measuring apparatus using laser light has the following problems. Since it is necessary to accurately position and fix the measurement device so that the incident angle of the laser beam on the surface to be measured is a constant angle, a dedicated fixing jig is required, and positioning and fixing are very laborious. Often. In particular, when the surface to be measured is a curved surface, it is difficult to accurately position and fix the measuring device.

  On the other hand, in production facilities, the surface roughness of press dies and the like has a significant effect on product quality, and therefore it is desired to measure the surface roughness regularly. There is a need for a surface roughness measuring apparatus that can easily and accurately measure the surface roughness of a measurement surface.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a surface roughness measuring device that can easily and accurately measure the surface roughness of a surface to be measured including a curved surface on site. To do.

In order to solve the above-mentioned problem, a surface roughness measuring apparatus according to the invention of claim 1 includes an apparatus housing having a measuring unit pressed against a surface to be measured, and the surface to be measured provided in the apparatus housing. A posture monitoring optical system including a posture monitoring light-emitting element that causes light to enter and a posture monitoring light-receiving element that receives the reflected light and outputs a signal representing the posture of the apparatus housing with respect to the surface to be measured; A measurement light-emitting element that is provided in an apparatus housing and that makes light incident on the surface to be measured and a light-receiving element for measurement that receives the reflected light and outputs a signal representing the surface roughness of the surface to be measured An optical system; and a calculation means for calculating the surface roughness of the surface to be measured based on an output signal of the light receiving element for measurement, and the output signal of the posture monitoring light receiving element is measured by the apparatus housing according to a predetermined measurement. When it indicates that it is in a posture, There is characterized in that so as initiate the operation of the surface roughness of the surface to be measured based on the output signal of the measuring light receiving element.
According to a second aspect of the present invention, there is provided a surface roughness measuring apparatus comprising: a device housing having a measuring unit that is pressed against a surface to be measured; An attitude monitoring optical system including an attitude monitoring light receiving element that receives an element and reflected light of the element and outputs a signal representing the attitude of the apparatus casing with respect to the surface to be measured; and A measurement optical system including a measurement light-emitting element that causes light to enter the measurement surface, a measurement light-receiving element that receives the reflected light and outputs a signal representing the surface roughness of the measurement surface, and the measurement light-receiving element Calculation means for calculating the surface roughness of the surface to be measured based on the output signal, and a display unit for displaying the surface roughness calculated by the calculation means, and the output signal of the posture monitoring light receiving element is the Indicates that the device housing is in a predetermined measurement posture Rutoki, wherein said calculating means has to start the operation of the surface roughness of the surface to be measured based on the output signal of the measuring light receiving element.
According to a third aspect of the present invention, there is provided the surface roughness measuring apparatus according to the second aspect, wherein the calculating means is a displacement of the apparatus housing relative to the measuring attitude based on an output signal of the attitude monitoring light receiving element. , And the display unit displays a displacement of the apparatus housing with respect to the measurement posture.
According to a fourth aspect of the present invention, there is provided the surface roughness measuring apparatus according to any one of the first to third aspects, wherein the calculating means outputs the output signal of the posture monitoring light-receiving element when the device casing is in the measuring posture. When it is shown that the surface roughness is calculated, the calculation of the surface roughness of the surface to be measured is automatically started.
According to a fifth aspect of the present invention, there is provided the surface roughness measuring apparatus according to any one of the first to fourth aspects, wherein the apparatus housing is gripped by a measurer and the measuring portion is pressed against the surface to be measured. It is characterized by dimensions.

The surface roughness measuring device according to the invention of claim 6 is provided in the measuring housing, the measuring device having a measuring unit pressed against the surface to be measured separately from the device main body, and the measuring device. A light emitting unit that makes light incident on the surface to be measured, a light receiving unit that receives the reflected light thereof, and a light emitting element that emits light and a signal representing the distribution of the intensity of the received light are output. A light receiving element; a connection cable including an optical fiber that transmits light from the light emitting element to the light emitting part; and an optical fiber that transmits light from the light receiving part to the light receiving element; and Based on the output signal, it comprises an operation means for detecting the posture of the measurement housing with respect to the surface to be measured, and for calculating the surface roughness of the surface to be measured. Detected that it is in a predetermined measurement posture It can, characterized in that to start the operation of the surface roughness of the surface to be measured.
According to a seventh aspect of the present invention, in the surface roughness measuring apparatus according to the sixth aspect of the invention, when the calculation means detects that the measurement housing is in a predetermined measurement posture, the surface roughness is automatically measured. The calculation of the surface roughness of the surface is started.
According to an eighth aspect of the present invention, there is provided the surface roughness measuring apparatus according to the sixth or seventh aspect, wherein the computing means changes the displacement of the measurement housing relative to the measurement posture based on an output signal of the light receiving element. A display unit is provided for detecting and displaying the detected displacement of the measurement casing with respect to the measurement posture.

  According to the surface roughness measuring apparatus according to the present invention, the apparatus housing is detected by the attitude monitoring optical system by appropriately moving the apparatus casing against the surface to be measured, The surface roughness of the surface to be measured can be measured by the measuring optical system.

  In addition, by separating the device body and measurement housing from each other and connecting them with a connection cable, the measurement housing can be reduced in size, improving operability and reducing the surface roughness of the narrow part. Measurements can be made.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the surface roughness measuring apparatus 1 according to the present embodiment monitors the attitude of the apparatus housing 2 with respect to the surface S to be measured (showing a convex shape and a concave shape). For processing the posture monitoring optical system 3, the measurement optical system 4 for measuring the surface roughness of the surface S to be measured, and the output signals from the posture monitoring optical system 3 and the measurement optical system 4 An arithmetic unit 5 (arithmetic means) for performing the calculation and a display unit 6 for displaying the calculation result by the arithmetic unit 5 are provided.

  As shown in FIG. 3, the apparatus housing 2 has a half-columnar measuring unit 7 formed at one end of a substantially rectangular main body. A window 8 for transmitting the laser light of the posture monitoring optical system 3 and the measurement optical system 4 is provided at the center of the measurement unit 7. The window 8 is sufficiently large with respect to the measurement area A (for example, about 3 mm in diameter) of the measurement surface S. The apparatus housing 2 has dimensions such that a measurement person can hold it with one hand and press the measuring unit 7 against the surface S to be measured, and is 150 mm or less in length, 150 mm or less in width and 75 mm or less in thickness in FIG. It is desirable.

  The posture monitoring optical system 3 includes a posture monitoring light-emitting element 9 and a posture monitoring light-receiving element 10 which are arranged in a substantially vertical direction so as to face the window portion 8 of the measurement unit 7. The posture monitoring light-emitting element 9 generates laser light and makes it incident on the measurement surface S through the window 8, and the posture monitoring light-receiving element 10 outputs a predetermined electrical signal when receiving the reflected light. The posture monitoring light-emitting element 9 and the posture monitoring light-receiving element 10 are a method of passing through the center of the window portion 8 when the apparatus housing 2 is in a predetermined measurement posture, that is, the measurement portion 7 is pressed against the surface S to be measured. When the line is perpendicular to the measured surface S, the reflected light of the laser light incident on the measured surface S from the posture monitoring light emitting element 9 is received by the posture monitoring light receiving element 10. ing. At this time, by reducing the angle θ between the incident light and the reflected light of the attitude monitoring optical system 3, the interval between the attitude monitoring light emitting element 9 and the attitude monitoring light receiving element 10 can be reduced, and the apparatus housing The width of the body 2 can be reduced. In addition, the posture of the apparatus housing 2 can be generally obtained by measuring two relative three-dimensional positions with respect to the surface S to be measured at a certain reference position in the apparatus housing 2.

  The measurement optical system 4 includes a measurement light-emitting element 11 that generates laser light and enters the surface S to be measured through the center of the window 8 and a measurement light-receiving element array 12 that receives the reflected light (measurement light-receiving element). It consists of In the measurement light emitting element 11 and the measurement light receiving element array 12, when the apparatus housing 2 is in the above-described measurement posture, the laser light is incident on the measurement surface S at a predetermined incident angle α, and the reflected light is used for measurement. It arrange | positions so that it may light-receive in the center part of the light receiving element array 12. FIG. The light-receiving element array 12 for measurement receives reflected light reflected by the surface S to be measured and scattered by the unevenness by a CCD array or the like, and outputs the intensity distribution of the light as an electric signal. . Here, by increasing the incident angle α, the angle formed between the incident light and the reflected light of the measurement optical system 4 can be reduced, and the width of the apparatus housing 2 can be reduced.

  The arithmetic unit 5 receives the output signals of the posture monitoring light receiving element 10 and the measurement light receiving element array 12, processes them according to a predetermined logic rule, and outputs a signal to the display unit 6. When the arithmetic unit 5 receives a predetermined output signal from the posture monitoring light-receiving element 9, that is, the normal passing through the center of the window 8 is perpendicular to the measured surface S, the posture monitoring light-emitting element When the reflected light of the laser light incident on the measurement surface S from 9 is received by the posture monitoring light-receiving element 10, this is used as a trigger based on the output signal of the measurement light-receiving element array 12. Starts calculation of surface roughness. Thereby, since the incident angle of the laser light incident on the measurement surface S from the measurement light emitting element 11 at the time of measuring the surface roughness is surely the incident angle α, an accurate and stable measurement result can be obtained. In addition, the arithmetic unit 5 outputs a calculation start signal to the display unit 6 at the same time as the calculation of the surface roughness. The arithmetic unit 5 then determines the surface of the measured surface S according to the scattering state of the reflected light from the measured surface S based on the electrical signal representing the intensity distribution of the light received from the measurement light receiving element array 12. The roughness is calculated and the calculation result is output to the display unit 6.

  The display unit 6 includes a display unit 13 for displaying the surface roughness calculated by the arithmetic unit 5 by a liquid crystal display or the like, and a perceptual unit 14 such as a buzzer or a lamp that operates when receiving a calculation start signal from the arithmetic unit 5. It consists of and. Display of the surface roughness by the display unit 13 is, for example, about 0.01 to 10 μm in terms of the center line average roughness Ra based on the calculation result of the calculation unit 5.

The operation of the present embodiment configured as described above will be described next.
The measurer operates the surface roughness measuring device 1, holds the device housing 2, and places the measuring unit 7 such as a press die so that the device housing 2 is substantially perpendicular to the surface S to be measured. Press against the surface to be measured S, and the apparatus housing 2 is swung with the measurement area A of the surface to be measured S as a fulcrum (see the arrow in FIG. 3). At this time, since the measurement unit 7 has a half columnar shape, the measurement unit 7 can be easily pressed against the measurement surface S even if the measurement surface S is convex or concave.

  By swinging the device housing 2, when the device housing 2 is in the measuring posture, that is, the normal passing through the center of the window 8 of the measuring unit 7 is perpendicular to the surface S to be measured. At this time, the reflected light of the laser light incident on the measurement surface S from the posture monitoring light emitting element 9 is received by the posture monitoring light receiving element 10 and a predetermined output signal is output. Start the operation. Further, the arithmetic unit 5 operates the sensory unit 14 to inform the measurer of the start of the calculation of the surface roughness by a lamp, a buzzer or the like. The arithmetic unit 5 calculates the surface roughness of the surface S to be measured based on the electrical signal from the measurement light receiving element array 12 and displays the result on the display unit 13.

  In this way, the measurement posture of the apparatus housing 2 is monitored and the surface roughness of the surface S to be measured is optically detected by the posture monitoring optical system 3 and the measurement optical system 4, so that the measurement can be accurately performed in a short time. The surface roughness can be measured. The measurer can easily and accurately measure the surface roughness of the surface S to be measured such as a press mold on site, and can efficiently perform maintenance and inspection of the mold. It becomes.

  In the above embodiment, the arithmetic unit 5 automatically starts the calculation of the surface roughness using the output signal of the posture monitoring light receiving element 10 as a trigger, but in addition, a calculation start switch for instructing the start of the calculation is provided. In addition, when the output signal of the posture monitoring light receiving element 10 is received, the sensory unit 14 is operated to notify the measurer that the apparatus housing 2 is in the measurement posture. Then, the surface roughness calculation may be started by the operator operating the calculation start switch.

  As a modification of the above-described embodiment, as shown in FIG. 2, the posture monitoring light receiving elements 10 are two-dimensionally arrayed, and the displacement of the light receiving posture of the reflected light from the measurement surface S from the array center O is monitored. Based on the displacement, the measurement unit may be instructed by the display unit 13 or the like in the direction in which the apparatus housing 2 should be swung. Then, when the reflected light is incident on the array center O, the calculation by the calculation unit 5 is started, or the sensory unit 14 is operated to prompt the measurer to operate the calculation start switch.

  In addition to the shape shown in FIG. 3, the device housing 2 may have a shape in which a hemispherical measurement portion 7 is formed at one end of a cylindrical main body as shown in FIG. 4. Thereby, when the measured surface S is a concave third-order curved surface, the measuring unit 7 can be easily pressed against the measured surface.

  Furthermore, although the said embodiment demonstrated the case where the arithmetic unit 5 and the display part 6 were integrated in the apparatus housing | casing 2, the arithmetic unit 5 and the display part 6 are different from the apparatus housing | casing 2. The body may be connected to the posture monitoring optical system 3 and the measurement optical system 4 incorporated in the apparatus housing 2 by lead wires or the like.

  Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part with respect to the said 1st Embodiment, and only a different part is demonstrated in detail.

  As shown in FIG. 5, in the surface roughness measuring device 15 according to the present embodiment, the device main body 16 and the measurement housing 17 are provided separately, and these are connected to each other by a connection cable 18. The apparatus body 16 is provided with a calculation unit 5, a measurement light emitting element 11, a measurement light receiving element array 12, a display unit 13, and a perception unit 14 in a case 18.

  The measurement housing 17 has a substantially tapered measurement portion 20 formed at the tip of a substantially cylindrical case 19. The measuring unit 20 may have a pointed shape such as a half columnar shape or a hemispherical shape as shown in FIGS. 3 and 4 in addition to the tapered shape. A window 8 is opened at the center of the tip of the measurement unit 20. The case 19 is provided with a light emitting unit 21 and a light receiving unit 22, which are connected to the measuring light emitting element 11 (light emitting element) and the measuring light receiving element array 12 (light receiving element) by a connection cable 18, respectively. Yes.

  The light emitting unit 21 is connected to the measurement light emitting element 11 by an optical fiber 23 constituting the connection cable 18, and transmits the laser light generated by the measurement light emitting element 11 through the optical fiber 23 to emit laser light. The light receiving unit 22 includes a large number of light receiving portions arranged in an array similar to the measurement light receiving element array 12, and each light receiving portion corresponds to the light receiving corresponding to the measurement light receiving element array 12 via the optical fiber 24. Connected to each part. The laser light incident on each light receiving portion of the light receiving unit 22 is transmitted to the measurement light receiving element array 12 through the optical fiber 24, and the measurement light receiving element array 12 outputs the intensity distribution of the light as an electrical signal.

  The light emitting unit 21 and the light receiving unit 22 are arranged so that the laser light emitted from the light receiving unit 21 is incident on the measurement surface S through the window 8 and the reflected light is received by the light receiving unit 22. At this time, when the measurement housing 17 is in a predetermined measurement posture, that is, the tip of the measurement unit 20 is pressed against the measurement surface S, and the normal passing through the center of the window portion 8 is relative to the measurement surface S. It is arranged so that the reflected light of the laser beam incident on the measurement surface S from the light emitting unit 21 is received at the center of the light receiving unit 22 when it becomes vertical. Here, the distance between the light emitting unit 21 and the light receiving unit 22 is reduced by reducing the angle between the laser light incident on the measured surface S from the light emitting unit 21 and the reflected light from the measured surface S to the light receiving unit 22. And the width of the measurement housing 17 can be reduced.

  The connection cable 18 bundles together an optical fiber 23 that connects the measurement light emitting element 11 and the light emitting unit 21 and a large number of optical fibers 24 that connect the measurement light receiving element array 12 and the light receiving unit 22, and is appropriately reinforced. It has the necessary flexibility (flexibility) and strength.

  In the surface roughness measuring device 15 according to the present embodiment, the measurement light-emitting element 11, the measurement light-receiving element array 12, the connection cable 18, the light-emitting unit 21, and the light-receiving unit 22 constitute a measurement optical system. This measurement optical system also serves as an attitude monitoring optical system for monitoring the attitude of the measurement housing 17 with respect to the surface S to be measured. That is, the arithmetic unit 5 monitors the array coordinates of the maximum luminance in the output signal of the measurement light receiving element array 12, and when the central portion of the measurement light receiving element array 12 reaches the maximum luminance, the measurement housing 17 is in the measurement posture. Decide that.

The operation of the present embodiment configured as described above will be described next.
The measurer operates the surface roughness measuring device 15 to hold the measurement housing 17 and place the measurement unit 20 such as a press die so that the measurement housing 17 is substantially perpendicular to the surface S to be measured. Press against the surface S to be measured. In this state, the measurement housing 17 is swung with the measurement region of the measurement surface S as a fulcrum. At this time, since the measurement casing 17 is connected to the apparatus main body 16 by a flexible connection cable 18, the measurement casing 17 can be reduced in size, and the operability is improved and the surface roughness of the narrow portion is improved. Can be measured.

  The arithmetic unit 5 starts the calculation of the surface roughness when the measurement housing 17 is in the measurement posture, that is, when it is detected that the central portion of the measurement light receiving element array 12 has reached the maximum luminance. Further, the arithmetic unit 5 operates the sensory unit 14 to inform the measurer of the start of the calculation of the surface roughness by a lamp, a buzzer or the like. The arithmetic unit 5 calculates the surface roughness of the surface S to be measured based on the electrical signal from the measurement light receiving element array 12 and displays the result on the display unit 13.

  Thus, the surface roughness can be accurately measured in a short time by optically monitoring the measurement posture of the measurement housing 17 and detecting the surface roughness of the surface S to be measured. At this time, since the measurement optical system also functions as the posture monitoring optical system for monitoring the measurement posture of the measurement housing 17, a separate posture monitoring optical system is unnecessary, and the structure is simplified and the size is reduced. be able to. In the first embodiment as well, as in the second embodiment, the measurement optical system 4 detects the attitude of the apparatus housing 2 with respect to the measurement surface S based on the output signal of the measurement light receiving element array 12. Therefore, the measurement optical system 4 can also serve as the attitude monitoring optical system 3, and thus the attitude monitoring optical system 3 can be omitted.

  In the second embodiment, a posture monitoring optical system may be provided separately as in the first embodiment. Similarly to the one shown in FIG. 2, the arithmetic unit 5 monitors the displacement from the array center of the coordinates where the maximum luminance is detected in the output signal of the measurement light-receiving element array 12, and displays based on the displacement. The direction in which the measurement housing 17 should be swung may be instructed to the measurer by the unit 13 or the like.

  As in the case of the first embodiment, the arithmetic unit 5 automatically starts calculating the surface roughness when the arithmetic unit 5 detects that the measurement housing 17 is in the measurement posture. In addition, a calculation start switch for instructing the start of calculation is provided separately, and when it is detected by the calculation unit 5 that the measurement casing 17 is in the measurement posture, the perception unit 14 is activated and the measurement casing 17 is in the measurement posture. This may be notified to the measurer, whereby the measurer may start the calculation of the surface roughness by operating the calculation start switch with respect to the operation of the perception unit 14.

It is a longitudinal cross-sectional view which shows schematic structure of the surface roughness measuring apparatus which concerns on 1st Embodiment of this invention. It is the schematic which shows the modification of the attitude | position monitoring optical system of the surface roughness measuring apparatus shown in FIG. It is a perspective view which shows the shape of the apparatus housing | casing of the surface roughness measuring apparatus shown in FIG. It is a perspective view which shows the modification of the shape of the apparatus housing | casing of the surface roughness measuring apparatus shown in FIG. It is a longitudinal cross-sectional view which shows schematic structure of the surface roughness measuring apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Surface roughness measuring apparatus, 2 apparatus housing | casing, 3 attitude | position monitoring optical system, 4 measuring optical system, 5 arithmetic unit (calculation means), 6 display part, 7 measuring part, 9 attitude | position monitoring light emitting element, 10 attitude | position Light-receiving element for monitoring, 11 Light-emitting element for measurement, 12 Light-receiving element array for measurement (light-receiving element for measurement), 15 Surface roughness measuring device, 16 Device body, 17 Measuring housing, 18 Connection cable, 23, 24 Optical fiber, 20 measuring units, 21 light emitting units

Claims (8)

A device housing having a measuring unit pressed against the surface to be measured; a light emitting element for posture monitoring provided on the device housing for allowing light to enter the surface to be measured; A posture monitoring optical system including a posture monitoring light-receiving element that outputs a signal representing a posture with respect to the surface to be measured, a light emitting element for measurement that is provided in the apparatus housing and makes light incident on the surface to be measured, and its reflection A measuring optical system including a measuring light receiving element that receives light and outputs a signal representing the surface roughness of the measured surface, and the surface roughness of the measured surface based on the output signal of the measuring light receiving element And calculating means for calculating the output signal of the light receiving element for measurement when the output signal of the light receiving element for posture monitoring indicates that the apparatus housing is in a predetermined measuring posture. Based on the surface roughness of the surface to be measured. Surface roughness measuring apparatus being characterized in that so as to start. A device housing having a measuring unit pressed against the surface to be measured; a light emitting element for posture monitoring provided on the device housing for allowing light to enter the surface to be measured; A posture monitoring optical system including a posture monitoring light-receiving element that outputs a signal representing a posture with respect to the surface to be measured, a light emitting element for measurement that is provided in the apparatus housing and makes light incident on the surface to be measured, and its reflection A measuring optical system including a measuring light receiving element that receives light and outputs a signal representing the surface roughness of the measured surface, and the surface roughness of the measured surface based on the output signal of the measuring light receiving element And a display unit for displaying the surface roughness calculated by the calculation means, and the output signal of the light-receiving element for posture monitoring indicates that the device housing is in a predetermined measurement posture. When the calculation means has the light receiving element for measurement Surface roughness measuring apparatus being characterized in that so as to start the operation of the surface roughness of the surface to be measured based on the output signal of the. The computing means detects a displacement of the device casing with respect to the measurement posture based on an output signal of the posture monitoring light receiving element, and the display unit displays a displacement of the device housing with respect to the measurement posture. The surface roughness measuring apparatus according to claim 2. The calculating means automatically starts calculating the surface roughness of the surface to be measured when the output signal of the posture monitoring light-receiving element indicates that the apparatus housing is in the measuring posture. The surface roughness measuring device according to claim 1, wherein the surface roughness measuring device is a surface roughness measuring device. The surface roughness measuring device according to any one of claims 1 to 4, wherein the device casing is dimensioned to be held by a measurer and to press the measuring unit against the surface to be measured. An apparatus main body, a measurement casing having a measurement unit that is pressed against the surface to be measured, separately from the apparatus main body, a light emitting unit that is provided in the measurement casing and makes light incident on the surface to be measured, and its reflection A light receiving unit that receives light, a light emitting element that is provided in the apparatus main body and that emits light, a light receiving element that outputs a signal indicating the intensity distribution of the received light, and light from the light emitting element to the light emitting unit. A connection cable including an optical fiber that transmits light and an optical fiber that transmits light from the light receiving unit to the light receiving element, and the measurement housing with respect to the surface to be measured based on an output signal of the light receiving element. Calculation means for detecting the posture of the body and calculating the surface roughness of the surface to be measured. When the calculation means detects that the measurement housing is in a predetermined measurement posture, Start calculation of surface roughness of measurement surface Surface roughness measuring device according to claim Rukoto. The surface according to claim 6, wherein the calculation means automatically starts calculating the surface roughness of the surface to be measured when detecting that the measurement casing is in a predetermined measurement posture. Roughness measuring device. The calculation means includes a display unit that detects a displacement of the measurement housing with respect to the measurement posture based on an output signal of the light receiving element and displays the detected displacement of the measurement housing with respect to the measurement posture. The surface roughness measuring apparatus according to claim 6 or 7, wherein

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