JP5507895B2 - Transmission type measuring device - Google Patents

Description

The present invention relates to a transmission type dimension measuring apparatus, and in particular, an optical transmission that measures various dimensions of a measurement object by detecting a change in light amount when the measurement object blocks light emitted from a projector by a light receiver. The present invention relates to a mold dimension measuring apparatus.

Conventionally, in order to detect an outer diameter, a position, an interval, and the like of an object, an optical transmission type dimension measuring apparatus is used. The optical transmission type dimension measuring apparatus includes a light projector that projects parallel light to a measurement target region, and a light receiver that receives light transmitted through the measurement target region. Based on the amount of light received by the light receiver, The length of the shadow of the measurement object generated by shielding the parallel light by the measurement object is measured, and various dimensions of the measurement object are measured.

The measuring principle of this optical dimension measuring device is roughly classified into two types, that is, a CCD method and a scanning method. In the CCD system, light emitted from a light emitting element is converted into parallel light by a projection lens, and this parallel light is irradiated onto a dimension measurement area. The light receiver receives light from the dimension measurement area with a built-in one-dimensional CCD image sensor. When the measurement object shields the parallel light, a shadow proportional to the size of the light shielding area is generated in the light receiving unit, and various dimensions of the measurement object are calculated and output based on the size and position of the shadow.

In the scanning method, light emitted from a light emitting element is deflected by a deflecting element such as a polygon mirror, converted into parallel rays by a collimator lens, and irradiated to a dimension measurement area. The light that has scanned the measurement object in the dimension measurement area is collected by a light receiving lens inside the light receiver, and converted into an electrical signal corresponding to the brightness of the light. Based on this electrical signal, the length of time during which the shadow is generated is calculated to calculate and output various dimensions of the measurement object. In any of the above methods, the width of the dimension measurement area is defined by the width of the parallel light emitted from the light projecting slit of the light projector and received through the light receiving slit of the light receiver.

Such a transmission-type dimension measuring apparatus can switch a measurement region for calculating a dimension value by selecting a “measurement mode” in accordance with a user application. The measurement mode determines the start point and end point of the measurement region, and includes, for example, a light shielding region measurement mode, a light incident region measurement mode, a center measurement mode, an outer diameter measurement mode, an arbitrary edge measurement mode, a center interval measurement mode, and the like.

FIG. 23 is a diagram for explaining a measurement region in each measurement mode. In the light shielding area measurement mode, the width from one end of the dimension measurement area to the end of the first light shielding area is measured. In the light incident area measurement mode, the width from one end of the dimension measurement area to the end of the first light incident area is measured. In the center measurement mode, the width from one end of the dimension measurement area to the center position of the first edge position and the last edge position, which are the switching positions of the light incident area to the light shielding area, is measured. In the arbitrary edge measurement mode, an interval between edge positions arbitrarily designated by the user is measured. In the center interval measurement mode, the pin interval arbitrarily specified by the user can be measured. Note that the measurement mode is not limited to those listed here, and for example, a user-specific measurement mode can be defined.

When the measurement mode is selected by the user and a light-shielding area due to the measurement object is detected in the dimension measurement area, the start point and end point of the measurement area corresponding to the selected measurement mode are set based on the detected light-shielding area. Is done. For example, when the light shielding area measurement mode is selected and the light shielding area shown in FIG. 23A is detected, one end of the dimension measurement area is set as the start point of the measurement area and the edge corresponding to the end of the light shielding area is set as the end point. A position is set, and an area between the start point and the end point is set as a measurement area. Next, the width of this measurement region is calculated as a dimension value.

As described above, in the conventional transmission type dimension measuring apparatus, the measurement area is determined based on the measurement mode selected by the user and the light shielding area by the actual measurement object. A wide variety of measurements can be performed according to the type of measurement object.

Conventionally, in a transmission type dimension measuring apparatus, a display unit is provided in a controller connected to a projector and a light receiver. However, since only the dimension value (numerical value) is displayed on the display unit, the dimension value is only changed even if the measurement region is changed by selecting the measurement mode. From this dimension value, it is very difficult for the user to determine whether or not the measurement mode suitable for his / her application is correctly selected. Although it is conceivable to perform display for identifying the measurement mode on the display unit of the controller, this display unit is often an inexpensive one composed of 7-segment LEDs or the like, and has many measurement modes as described above. It is difficult to display sufficient information for identifying the measurement mode, and the user cannot intuitively recognize the currently set measurement mode.

In addition to the above problems, dirt or the like may adhere to the light projecting surface and the light receiving surface depending on the use environment of the user. If dirt or the like adheres to the light projecting surface of the projector and the light receiving surface of the light receiver, the amount of light received may vary despite the absence of the measurement object, which may result in unexpected measurement errors, and for the user. There is a problem that it is difficult to understand what is happening. Even if the size of the dirt is very small, if an edge that should not originally exist is detected due to the dirt, the dimension value is output as a value far from the actual dimension value of the measurement object. Even if the user looks at the output dimension value, he / she intuitively knows whether it is the actual measurement object dimension value, whether the light emitting surface or the light receiving surface is contaminated, or whether there is a problem in the usage environment. Therefore, it is necessary to periodically clean the light emitting surface of the light projector and the light receiving surface of the light receiver so as to obtain an appropriate dimension measurement value.

The present invention has been made in view of the above-mentioned problems, and enables intuitive recognition of whether or not a user-desired measurement mode is correctly selected, and is provided on the light projecting surface of the light projector and the light receiving surface of the light receiver. An object of the present invention is to provide a transmission type dimension measuring apparatus capable of promptly taking appropriate measures when dirt is attached.

The present invention includes a light emitting element that emits light, a light projecting lens that converts light emitted from the light emitting element into parallel light, a light projecting slit for emitting the parallel light to the outside, and the parallel light projector. A light receiver comprising: a light receiving slit that receives light; a light receiving element that receives light incident on the light receiving slit; and a controller that is connected to at least the light receiver and performs drive control of the light receiving element. Is a transmission type dimension measuring device that forms a dimension measuring area between a light projecting slit and a light receiving slit by arranging them at a predetermined interval, and a light receiving signal (spatial or time) output from a light receiving element. A light-shielding area detecting means for detecting a light-shielding area by the measurement object arranged in the dimension measurement area out of the light incident on the light-receiving element, From multiple measurement modes for selecting the start and end points of the measurement area calculated as dimension values in the legal measurement area (for example, the upper or lower end of the dimension measurement area, the edge position of the light shielding area, the center between the edge positions, etc.) Measurement mode selection means for receiving selection of one measurement mode, dimension value calculation means for calculating the dimension value of the measurement area based on the selected measurement mode and the light shielding area by the measurement object, a light projecting slit and a light receiving slit A plurality of indicator lamps arranged in a row corresponding to each area to which the width in the dimension measurement direction of the dimension measurement area having a width in the longitudinal direction is divided (for example, those in which a plurality of LEDs are provided as an integrated type or separated The measurement area corresponding to the dimension value calculated by the dimension value calculation means can be distinguished from other areas by the lighting pattern of multiple indicator lamps. Characterized in that it comprises a measurement area display unit that displays.

Accordingly, the user can intuitively determine whether or not the set measurement mode is appropriate by visually recognizing the lighting patterns of the plurality of indicator lamps on the measurement area display unit. Even when the output dimension value is far from the assumed value, the area to be detected as the light shielding area is not detected as the light shielding area by checking the lighting pattern of the measurement area display unit. It is possible to confirm the state and the state where the area where the measurement object does not exist has been detected as the light shielding area due to adhesion of the light projecting surface and the light receiving surface, and appropriate measures can be taken promptly.

In a more detailed aspect, the measurement mode selection unit is a unit that performs selection of the measurement mode by operating an operation switch provided in the controller, and the measurement region display unit displays the measurement mode by the operation switch. The lighting patterns of the plurality of indicator lights are updated following the change.

Thereby, the measurement mode can be easily changed by the user operating the operation switch provided in the controller. Further, since the lighting pattern of the measurement area display unit is updated in real time following the user's measurement mode change operation, the measurement mode setting can be changed more intuitively.

In a more detailed aspect, the measurement mode selection means can set any measurement area by selecting the start point and end point of any measurement area based on the light-shielding area while the measurement area display section displays the measurement area. The measurement area display unit displays an arbitrary measurement area set by the measurement mode selection means by updating the lighting patterns of a plurality of indicator lamps.

Thus, for example, when measuring a measurement object having a complicated shape including a plurality of light-shielding regions that are spaced apart from each other, the user is complicated by switching the measurement mode with the measurement object set in the dimension measurement area. It is possible to intuitively set a desired measurement area while comparing a measurement object having a specific shape with the set measurement area.

In a more detailed aspect, the light shielding area detecting means is means for detecting the light shielding area by comparing a light reception signal output from the light receiving element with a predetermined threshold, and the measurement area display unit displays the measurement area. In this state, when the threshold value changing unit for changing the threshold value is changed and the threshold value is changed by the threshold value changing unit, and the region detected by the light shielding region detection unit is changed as the light shielding region, the change of the light shielding region is performed. The lighting pattern of the plurality of indicator lamps of the measurement area display unit is updated following the change of the measurement area based on the measurement area.

As a result, for example, when measuring a measurement object with high transparency, the setting change of the threshold necessary for detection of the light shielding area can be executed while confirming the lighting pattern of the measurement area display part. Can be set.

In a more detailed aspect, the measurement region display unit is provided on the upper surface side facing the bottom surface of the light receiver on which the light receiver is installed, and the width in the arrangement direction of the plurality of indicator lamps of the measurement region display unit is a dimension. It is provided so that it may become substantially the same as the width of the measurement area in the dimension measurement direction.

As a result, the plurality of indicator lamps in the measurement area display section have a width corresponding to the actual dimension measurement area. Therefore, the light-shielding area of the actual measurement object is simulated by the lighting pattern of the plurality of indicator lamps. The user can set a desired measurement mode more intuitively.

In a more detailed aspect, the light emitting area display unit is further provided with a plurality of indicator lamps arranged side by side with the measurement area display unit. The light incident area having a predetermined amount or more of light is displayed so as to be distinguishable from other areas.

As a result, the light incident area display unit simulates the light projection spot that enters the light receiver, so that the measurement area can be set while comparing with the light incident area where the light is actually incident. For example, in a complex measurement object having a plurality of light shielding areas, the user can switch the measurement mode until the desired edge position becomes a measurement target while confirming the plurality of edge positions on the light incident area display unit. Convenience increases. Further, by confirming the lighting pattern of the light incident area display section, it becomes easier to confirm the dirt on the light projecting surface and the light receiving surface and the change in the usage environment, and appropriate maintenance can be performed at an early stage.

The present invention also includes a light emitting element that emits light, a light projecting lens that converts light emitted from the light emitting element into parallel light, and a light projecting slit that emits the parallel light to the outside. A light receiver comprising a light receiving slit for entering parallel light and a light receiving element for receiving the light incident on the light receiving slit; and a controller connected to at least the light receiver and performing drive control of the light receiving element; This is a control program for controlling an external control device connected to a transmission type dimension measuring apparatus that forms a dimension measuring area between a light projection slit and a light receiving slit by arranging the light receiver at a predetermined interval. Thus, one measurement mode is selected from a plurality of measurement modes for selecting the start point and end point of the measurement area calculated as dimension values in the dimension measurement area based on the light shielding area. A step of transmitting to the controller a setting signal for setting the measurement mode selected in the step to the controller, and obtaining at least a received light amount distribution received by the light receiver from the controller, In addition to the quantity distribution, the method includes a step of displaying, on a display screen, the light shielding region and a measurement region determined based on the selected measurement mode.

Thus, by displaying the measurement region corresponding to the dimension value on an external display device or the like, the user can intuitively determine whether the set measurement mode is appropriate. Further, since the received light amount distribution can be displayed in correspondence with the measurement region corresponding to the dimension value by the external control device, a desired measurement mode can be easily set while confirming the received light amount distribution.

According to the present invention, it is possible to intuitively recognize whether or not the measurement mode desired by the user is correctly selected, and it is possible to promptly take appropriate measures when dirt adheres to the light projecting surface of the projector and the light receiving surface of the light receiver. Treatment is possible.

Hereinafter, a transmission type dimension measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment described below, a CCD type transmission type dimension measuring apparatus using a laser diode (hereinafter referred to as LD) as a light projecting unit and a one-dimensional CCD image sensor (hereinafter referred to as CCD) as a light receiving element is taken as an example. explain.

FIG. 1 is a system configuration diagram showing an overall system of a transmission type dimension measuring apparatus in the present embodiment. The transmission type dimension measuring apparatus according to the present embodiment is connected to a projector 1 that projects light onto a measurement target region, a light receiver 2 that receives light transmitted through the measurement target region, a light projector 1 and a light receiver 2. It comprises a controller 3 for controlling these. The light projector 1 is formed with a light projecting slit 10 (light projecting window) that is a part for emitting light, and the light irradiated to the measurement target region through the light projecting slit 10 passes between the light projector 1 and the light receiver 2. A part of the light is blocked by the measurement object W passing therethrough. The light receiver 2 receives light that is not shielded by the measuring object W through the light receiving slit 20 (light receiving window).

FIG. 2 is a block diagram for explaining the internal configuration of the projector 1, the light receiver 2, and the controller 3. The light projector 1 includes an LD 11 that is a light emitting element, and laser light emitted from the LD 11 is converted into a strip-shaped parallel light by a light projecting lens 15 and irradiated onto a measurement target region. A laser drive circuit 12 for driving the LD 11 is connected to the LD 11, and the laser drive circuit 12 is controlled by an MCU (Micro Controller Unit) 13. The light receiver 2 receives a light from the measurement target region, a CCD 29, a filter circuit 30 that filters an electrical signal received by the CCD 29, an A / D converter 31 that performs A / D conversion on the filtered electrical signal, and a display An FPGA (Field Programmable Gate Array) 32 that controls the unit 34 and the CCD 29 and detects an edge position from an A / D converted electric signal, and an EEPROM 33 that stores a threshold value for detecting the edge position, the number of CCD pixels, and the like. . The controller 3 communicates with the projector 1 and the light receiver 2 via the controller communication driver 46, and executes an MCU 41 that executes various calculations, a controller display unit 42 that displays a calculated dimension value, an external I / F 45, various types A SW 44 for receiving measurement mode setting and threshold setting operations and an EEPROM 43 for storing various setting data are provided. The external I / F 45 includes an open collector output, an analog output, an external input line, and the like. In the present embodiment, each of the projector 1 and the light receiver 2 is described as having a dedicated function. However, a device having both a function as a projector and a function as a light receiver according to the present embodiment is used as a projector or a light receiver. It may be used as a container. Moreover, although the controller 3 in this Embodiment was comprised so that it might be connected to both the light projector 1 and the light receiver 2, the controller 3 connected only to the light receiver 2 using the spontaneous lighting type light projector 1, and You can also

The MCU 41 of the controller 3 accepts input of various signals from an external device via an external input line. The MCU 41 periodically transmits a light projection control signal to the light projector 1 and a light reception control signal to the light receiver 2 via the controller communication drivers 46a and 46b by an internal timer. The MCU 13 of the projector 1 that has received the projection control signal controls the laser drive circuit 12, and the laser drive circuit 12 drives the LD 11 to irradiate the measurement target region with parallel light via the projection lens 15 and the projection slit 10. To do. On the other hand, the FPGA 32 of the light receiver 2 receives the light reception control signal and drives the CCD 29. The CCD 29 has a plurality of pixels arranged one-dimensionally, receives light from the measurement target region via the light receiving slit 20, and receives light from the pixels to the FPGA 32 via the filter circuit 30 and the A / D converter 31. Send the amount.

The FPGA 32 creates a received light amount distribution of a measurement target region formed by a plurality of pixels from the acquired received light amount of each pixel, and compares the created received light amount distribution with the measurement threshold value P1 stored in the EEPROM 33. Thus, a light shielding area shielded by the object is detected. The edge position that is the boundary between the light incident area and the light shielding area and the received light amount information in the vicinity thereof are transmitted to the controller 3 via the receiver communication driver 38 and the controller communication driver 46. As described above, in this embodiment, the received light amount distribution received by each pixel of the CCD 29 is not transmitted to the controller 3 as it is, but after the edge position is detected by the light receiver 2, the edge position and the received light amount information in the vicinity thereof are detected. Is transmitted to the controller 3 to reduce the communication load and improve the processing speed. In the present embodiment, the FPGA 32 in the light receiver 2 detects the edge position. However, it goes without saying that the edge position may be detected in the controller 3.

A CCD image sensor is typically used as the light receiving element. However, a CMOS (Complementary Metal Oxide Semiconductor) image sensor may be used as the light receiving element instead of the CCD image sensor.

The controller 3 executes various calculations based on the edge position information received from the light receiver 2. The EEPROM 43 stores the measurement mode set by the user and the HI / LO threshold value that defines the tolerance range. Details of the measurement mode will be described later. For example, there are a plurality of measurement modes for selecting various areas to be measured by the user, such as a light shielding area, a light incident area, an outer diameter, an inner diameter, and a specified width between edges. Yes. The MCU 41 of the controller 3 calculates a dimension value corresponding to the set measurement mode from the received edge position information and displays it on the controller display unit 42. For example, when the arbitrary edge measurement mode is selected as the measurement mode and the area between the second edge position and the fifth edge position is set as the measurement area, the MCU 41 of the controller 3 receives the second edge from the received edge position. The area between the position and the fifth edge position is set as a measurement area, and the width of the measurement area is calculated as a dimension value. Subsequently, an OK / NG determination is made as to whether or not the calculated dimension value is within the tolerance range, and the determination result is output to the outside via the external I / F 45. Note that the measurement mode and the HI / LO threshold value can be changed by the SW 44, and the MCU 41 accepts the setting change and stores the changed contents in the EEPROM 43.

Other external inputs of the external I / F 45 include peak hold input, bottom hold input, bank switching input for switching various settings such as the measurement threshold P1, HI / LO threshold, and measurement mode according to the application, or A timing input or the like for controlling the measurement timing can be input.

The FPGA 32 transmits edge position information to the controller 3 and performs display control of the display unit 34 provided in the light receiver 1. The EEPROM 33 stores a light incident display threshold value P2 in addition to the measurement threshold value P1, and compares the acquired light reception amount distribution with the light incident display threshold value P2. Although details will be described later, the display unit 34 artificially represents a pixel position where light is received without being blocked by an object, that is, a light projection spot on the light receiving surface.

FIG. 3 is a perspective view showing an external appearance of the light receiver 2 provided with the display unit 34. The light receiver 2 has a substantially rectangular parallelepiped casing. The casing includes a reference surface 27, a lower casing 21 that covers both sides and a back surface except for a light receiving surface 28 erected vertically from the reference surface 27, and a reference. The upper casing 23 closes the upper surface facing the surface 27 and the front cover 22 having the light receiving slit 20 and receiving the light from the light projector 1.

The upper casing 23 is provided with mounting holes 25a and 25b for mounting to the base, and the light receiver 2 is mounted on the base by screwing screws into the mounting holes 25a and 25b. A transparent inclined surface 24 is formed at the corners of the upper casing 23 and the light receiving surface 28, and a display unit 34 that is visible from the outside is provided inside the inclined surface 24. Since the display unit 34 is provided inside the transparent inclined surface 24, the display unit 34 is exposed on both the upper surface side and the light receiving surface side, so that the visibility is very good for the user. Further, an optical axis coincidence display LED 37 for indicating completion of optical axis adjustment is provided in the vicinity of the inclined surface 24. The lower casing 23 is provided with a cable lead portion 26 on the back side facing the light receiving surface 28. Since the cable lead-out part 26 is formed by cutting out a part of the back surface, even when the cable is bent and pulled out, the cable can be pulled out without taking a useless space on the back side.

Since the display part 34 is arrange | positioned at the upper surface side facing the reference surface 27 installed in a base, the display part 34 is not hidden behind a base and installed. The optical axis in the direction perpendicular to the base, that is, in the height direction, automatically matches by attaching the reference surfaces 27 of the projector 1 and the light receiver 2 to the base. After the reference surface 27 is mounted on the horizontal base, the user completely adjusts the relative positions of the projector 1 and the receiver 2 within the plane horizontal to the base, so that the optical axes of the projector 1 and the receiver 2 are completely aligned. Can be made. At this time, since the display unit 34 is disposed on the upper surface side facing the reference surface 27, the user can adjust the optical axis in the horizontal plane while checking the display unit 34. If the reference surface 27 is distorted or the like, the optical axis in the height direction will not exactly match even if the reference surface 27 is installed on the base. Therefore, in the present embodiment, only the lower casing 21 having the reference surface 27 is formed by die casting with high horizontal accuracy, and the upper casing 23 and the front cover 22 are formed of inexpensive resin. Note that the lower casing 21 closes both side surfaces and the back surface, and it is also possible to install either one of the both side surfaces on the base and install the light receiver 2 in a vertical position.

FIG. 4 is a perspective view showing another appearance of the light receiver 2, and corresponding portions are given the same reference numerals as those in FIG. 3. The dimension measuring area in the CCD transmission type dimension measuring apparatus is physically defined by the length in the width direction of the light receiving element incorporated in the light receiver 2, and employs a projector 1 that emits parallel light having a width corresponding thereto. To do. Therefore, when it is desired to secure a wide dimension measurement area, the light receiver 2 having a wide light receiving slit 20 as shown in FIG. 4 is used.

FIG. 5 is a diagram schematically showing the functions of the display unit 34 and the optical axis coincidence display LED 37. The display unit 34 includes a light incident region display unit 35 having a length in the arrangement direction of the CCD 29, that is, a length substantially the same as the length of the dimension measurement area in the dimension measurement direction, and is formed of an array of a plurality of LEDs. The light incident area display unit 35 is disposed on the upper surface of the light receiver 2 on the extension of the dimension measurement area, and the projection spot incident on the CCD 29 is simulated in accordance with the lighting state of each LED constituting the light incident area display unit 35. Express. In the present embodiment, the light incident area display portion 35 is substantially the same as the length of the CCD 29 in the arrangement direction. However, the present invention is not limited to this. It may be enlarged or reduced. In addition, although it is not necessarily arranged on the extension of the dimension measurement area, the light incident area display unit 35 measures the dimension in order to express the projection spot in a pseudo manner and allow the user to intuitively match the optical axis. It is preferable to be arranged on an extension of the area. In addition, the vertical line provided in the light incident area | region display part 35 has shown that the corresponding LED is in a lighting state.

Each LED constituting the light incident area display unit 35 is turned on and off in accordance with the amount of light received by the pixel at the corresponding position of the CCD 29. More specifically, for example, assuming that the number of LEDs is 10 and the number of pixels of the CCD 29 is 1000, one LED corresponds to 100 pixels when the number of pixels is equally allocated to each LED. Each LED is assigned in order from one end in the arrangement direction to 100 pixels in the CCD pixel arrangement direction, and the FPGA 32 of the light receiver 2 determines whether or not each of the received light amounts of the 100 pixels exceeds the threshold value P2 for incident light display. The corresponding LED is turned on when there are a predetermined number or more of pixels exceeding P2. The lighting condition of the LED is not limited to this, and the corresponding LED may be turned on based on the total or average of the amount of light received by the pixels. Alternatively, the LED corresponding to the pixel position of the CCD 29 where light does not enter may be turned on, and only the LED corresponding to the pixel position of the CCD 29 where light enters may be turned off.

FIG. 6 is a diagram illustrating a lighting state of the light incident area display unit 35 when the optical axes of the projector 1 and the light receiver 2 are shifted. As shown in FIG. 6, the LED corresponding to the pixel position of the CCD 29 where no light enters due to the optical axis shift is turned off. Therefore, even when the light projection spot of the projector 1 is not visible to the user, the relative position of the projector 1 and the light receiver 2 is adjusted in which direction by checking the lighting pattern of the LED of the light incident area display unit 35. Then, it can be easily determined whether the optical axes are completely coincident.

FIG. 7 is a schematic diagram showing a lighting state of the light incident area display unit 35 when the optical axes of the projector 1 and the light receiver 2 coincide. When the optical axes of the projector 1 and the light receiver 2 coincide with each other, all the LEDs of the light incident area display unit 35 are turned on. In addition, when the optical axes match in an ideal state, the optical axis coincidence display LED 37 is turned on. In general, the light amount density of the parallel light emitted from the projector 1 is not uniform, and the light amount density is higher as it is closer to the central axis, and gradually decreases as the distance from the central axis is increased. Therefore, even if all the LEDs of the light incident area display unit 35 are turned on and the optical axes seem to be completely coincident with each other, the central axis of the parallel light is actually slightly shifted. Yes, it may not be an ideal optical axis coincidence state. Therefore, the optical axis coincidence display LED 37 is configured to be lit only when the light reception amount of the pixel having the smallest light reception amount among the pixel values of the CCD 29 is equal to or higher than a predetermined level. With such a configuration, the user can easily adjust the projector 1 and the light receiver 2 to the optimum relative positions without checking any external devices. The lighting conditions of the optical axis coincidence display LED 37 are not limited to those described above, and may be turned on by the total or average of the received light amounts of all the pixels of the CCD 29. You may make it light automatically, when it lights.

FIG. 8 is a diagram showing a lighting state of a modified example of the light incident area display unit 35. In order for the user to intuitively recognize the ideal optical axis coincidence state of the projector 1 and the light receiver 2, it is necessary to recognize the peak position of the received light amount distribution received by the CCD 29. In this modified example, the color of the LED corresponding to the pixel having a large received light amount among the lit LEDs corresponding to the pixel in the light incident state is changed. The transmission type dimension measuring apparatus in this modification has a display mode for adjusting the optical axis in order to realize an optimal optical axis coincidence state, and when set to this optical axis adjustment mode, the LED The approximate position of the received light amount peak position by the color of is displayed. Since the user can confirm the peak position of the amount of received light by visually recognizing the color of the LED, an optimal optical axis coincidence state can be easily realized. In this modification, the color of the LED corresponding to a pixel with a large amount of received light is changed. However, the present invention is not limited to this, and the light emission amount and display mode (flashing, etc.) of the LED may be changed.

In addition, the display pattern of the light incident area display unit 35 in this modification is useful not only during optical axis adjustment but also during normal measurement. When the irradiation amount of the projector 1 decreases or the amount of light received by the light receiver 1 decreases due to changes in the usage environment, the measured value is abnormal by checking the display color and display mode of the light incident area display unit 35. Necessary countermeasures can be taken before this occurs. Moreover, when a measuring object is a transparent body, the color and light quantity of LED change with the transmittance | permeability of a measuring object. Therefore, when setting the measurement threshold value P1 for detecting the edge according to the transmittance of the measurement object, it can be set with reference to the lighting pattern of the light incident area display section 35.

FIG. 9 is a diagram showing a lighting state of another modification of the light incident area display unit 35. In this modification, only the LED corresponding to the peak position of the received light amount distribution is lit, and the relative position between the projector 1 and the light receiver 2 is adjusted so that the lit LED is at the center of the LED array. An ideal optical axis coincidence state can be easily realized.

By the way, in the transmission type dimension measuring apparatus, when dust or dirt adheres to the light projecting surface or the light receiving surface, the dust or dust shields a part of the parallel light, so that an edge that should not originally exist is detected. Sometimes. In this case, the measurement value is output as a value far from the actual dimension value of the measurement object, and it is difficult for the user to easily determine what caused the abnormality in the measurement value. FIG. 10 is a diagram schematically illustrating a display pattern of the light incident area display unit 35 when dirt is attached to the light projecting surface or the light receiving surface. As shown in FIG. 10, when dirt is attached to the light projecting surface or the light receiving surface, the LED corresponding to the pixel position where the dirt on the light incident area display unit 35 is attached is turned off. Therefore, according to the present embodiment, the user can recognize the presence / absence of dirt and the position of dirt based on the lighting pattern of the LED of the light incident area display section 35, and can quickly perform maintenance.

As described above, in the present embodiment, the display unit 34 is provided on the upper surface side facing the reference surface 27 installed on the base of the light receiver 1, and this display unit 34 is irradiated from the projector 1 and the CCD 29. The projection spot received by the camera is expressed in a pseudo manner. Therefore, it is possible to adjust the optical axes of the projector 1 and the light receiver 2 with an intuitive operation even if the projection spot is not visible to the human eye. In order to obtain an optimal optical axis coincidence state, an optical axis coincidence display LED 37 can be provided to explicitly indicate completion of optical axis adjustment. Furthermore, the projection spot can be expressed in a pseudo manner, and the dirt adhering to the light projecting surface or the light receiving surface can be visualized, which facilitates maintenance for the user.

In addition, the transmission type dimension measuring apparatus according to the present embodiment includes a plurality of measurement modes for setting the start point and the end point of the measurement region that the user wants to output as a dimension value. As described in FIG. 23, the plurality of measurement modes include a light shielding area measurement mode, a light incident area measurement mode, an outer diameter measurement mode, a center measurement mode, an arbitrary edge measurement mode, a center interval measurement mode, and the like.

In the light shielding area measurement mode, the distance from one end of the dimension measurement area to the last edge position is calculated. In the incident light area measurement mode, the distance from one end of the dimension measurement area to the first edge position is calculated. In the outer diameter measurement mode, the distance between the first edge position and the last edge position is calculated from one end of the dimension measurement area. In the center measurement mode, the distance from one end of the dimension measurement area to the center position of the first edge position and the next edge position is calculated. The center position is determined by calculating the midpoint between the two detected edge positions. Arbitrary edge measurement mode calculates the distance related to the edge position specified by the user. For example, when there are two or more light-shielding areas, the number of edge positions counted from one end of the dimension measurement area is measured. In this mode, it is possible to arbitrarily set whether to be a target of the above. FIG. 23 shows an example in which the area between the second edge position and the fifth edge position counted from one end of the dimension measurement area is designated as the measurement area. The center interval measurement mode is a measurement mode in which the distance between the centers of the light shielding areas can be designated as the measurement area. In the example of FIG. 23, the area between the centers of the two light shielding areas is designated as the measurement area. These measurement modes can be set and switched by operating the SW 44 provided in the controller 3.

FIG. 11 is a schematic diagram showing another embodiment of the display unit 34 provided in the light receiver 2. The display unit 34 is provided with a measurement region display unit 36 in which a plurality of LEDs indicating the measurement region corresponding to the measurement mode set by the user are arranged in a line. In the example of FIG. 11, the outer diameter measurement mode is selected as the measurement mode, and the distance between the first edge position and the second edge position is calculated from one end of the dimension measurement area. As shown in FIG. 11, the measurement region display unit 36 lights only the LEDs corresponding to the pixel positions in the measurement region that is actually the measurement target. Therefore, the user can intuitively determine whether or not the currently set measurement mode is a desired mode. Further, since the lighting pattern of the LEDs constituting the measurement region display unit 36 changes according to the switching of the measurement mode, it is visually recognized which measurement region outputs the measurement value in each measurement mode. be able to.

In the case of this embodiment, the FPGA 32 of the optical receiver 2 shown in FIG. 2 reads the measurement mode set by the user and stored in the EEPROM 43 of the controller 3, and the detected edge position and the read measurement mode. The LED to be lit is determined according to the control, and the display of the measurement area display unit 36 is controlled. The measurement area display unit 36 is an extension of the dimension measurement area and has a width substantially the same as the width of the dimension measurement area, as in the case of the light incident area display unit 35 described above. Can grasp. In addition, by setting the pitch of the plurality of LEDs constituting the measurement area display unit 36 to a numerical value that can be cut well, such as 1 mm, it is possible to know the outline of the measurement value based on the number of lighted LEDs.

In general, the area that the user wants to measure varies depending on the user's measurement application or measurement object. Therefore, the transmission type dimension measuring apparatus in the present embodiment is provided with a plurality of measurement modes in advance, and even when the same measurement object is being measured, the user can switch the measurement mode by operating the SW 44. The start point and end point of the measurement area can be changed. The measurement area display unit 36 follows the change in the measurement area in real time, changes the lighting pattern of the plurality of indicator lamps, and displays the measurement area corresponding to the current dimension value.

FIG. 12 is a diagram schematically showing a change in the lighting pattern of the measurement region display unit 36 when the user switches the measurement mode during measurement of the same measurement object. Even if the same measurement object is being measured, if the user operates the SW 44 to switch the measurement mode, the measurement area changes, so that the lighting pattern of the measurement area display unit 36 changes following the change as shown in FIG. To do. Therefore, the user can select a desired measurement pattern while confirming the change of the lighting pattern of the measurement region display unit 36 without confirming the dimension value. In particular, when measuring a measurement object having a complicated shape with a plurality of light shielding regions, it is very difficult to determine whether or not a measurement mode for measuring a desired measurement region is selected from the dimension values. It is difficult to. However, according to the present embodiment, in a state where the measurement object is set, it is possible to confirm a change in the lighting pattern of the measurement area display unit 36 indicating the measurement area while confirming the desired position while comparing with the actual position of the measurement object. A measurement pattern can be easily selected.

FIG. 13 is a schematic diagram showing still another embodiment of the display unit 34 provided in the light receiver 2. As shown in FIG. 13, in the display unit 34 of the present embodiment, a light incident region display unit 35 and a measurement region display unit 36 each consisting of a plurality of LEDs are arranged in parallel on the extension of the dimension measurement area.

Each LED constituting the light incident area display unit 35 is not shielded by the measurement object, and the LED corresponding to the pixel position of the CCD 29 where the parallel light enters is lit. On the other hand, as for each LED which comprises the measurement area display part 36, the LED corresponding to the measurement area | region corresponding to the set measurement mode, ie, the dimension value actually obtained, lights. In the example of FIG. 13, the outer diameter measurement mode is selected as the measurement mode, and the distance between the first edge position and the second edge position is output as a dimension value. With such a configuration, it is possible to simultaneously confirm a region shielded from light by the measurement object and a region actually measured. In addition, the user can be prevented from being confused by changing the light emission colors such that the light emission color of the light incident area display unit 35 is red, for example, and the light emission color of the measurement area display unit 36 is green.

As described above, in the measurement mode, the user sets an arbitrary measurement area by selecting the start point and end point of the arbitrary measurement area (edge position, center position between edges, end position of the dimension measurement area, etc.) There are arbitrary edge measurement modes and center interval measurement modes that can be performed. FIG. 14 is a diagram for explaining a lighting pattern of each display unit when the light incident region display unit 35 and the measurement region display unit 36 are arranged in parallel. First, the user confirms the light incident area display unit 35 and confirms from which edge position to which edge position the desired measurement area. Subsequently, when the measurement mode is switched as shown in FIG. 14 by operating the SW 44, the lighting pattern of the measurement region display unit 36 changes in real time following the change of the measurement region. The user can easily select the desired measurement mode only by changing the measurement mode until the desired measurement area is reached while checking the change of the lighting pattern.

As described above, by arranging the light incident area display unit 35 and the measurement area display unit 36 in parallel, the user can set the measurement area while comparing with the edge position actually detected. Therefore, a desired measurement area can be easily set even when measuring a complicated measurement object having a plurality of light shielding areas.

Next, the setting of the measurement threshold value P1 for detecting the edge position will be described in detail. Generally, the measurement threshold value P1 of the transmission type dimension measuring apparatus is set to a height position at which the received light amount is 25% with respect to the received light amount in the non-light-shielded state. The received light amount distribution W1 shown in FIG. 15 shows the received light amount distribution when the projector 1 and the light receiver 2 are arranged relatively close to each other, and the received light amount distribution W2 is arranged so that the projector 1 and the light receiver 2 are relatively separated from each other. The received light amount distribution is shown. As shown in FIG. 15, the intersection of the received light amount distributions W1 and W2 substantially coincides with the measurement threshold value P1 (25%). This means that the same pixel position can be detected as the edge position without depending on the relative distance at which the projector 1 and the light receiver 2 are installed. Therefore, when the measurement threshold value P1 is set to the above-described 25% point, the same edge position can always be measured without depending on the relative distance between the projector 1 and the light receiver 2, and therefore the measurement threshold value is generally used. P1 is fixed at a height position where the received light amount is 25% in the non-light-shielding state.

In the present embodiment, the height position of the measurement threshold value P1 can be changed. For this reason, when the measurement threshold value P1 is changed, there is a possibility that the edge position slightly detected depending on the relative distance between the light projector 1 and the light receiver 2 may be shifted. However, depending on the user's usage environment or the transparency of the measurement object, the measurement threshold value P1 set at the 25% position may not properly detect only the edge position of the measurement object.

For example, in a transmission type dimension measuring apparatus, a measurement object having high transparency may be measured. In such a high-transparency measurement object, the light in the light-shielding region is incident on the light receiver 2 to some extent, so that the edge position for performing dimension measurement may not be detected appropriately. FIG. 16 is a diagram showing an example of the received light amount distribution output from the CCD 29. The horizontal axis indicates the pixel arrangement position of the CCD 29, and the vertical axis indicates the amount of light received by each pixel. Further, R1 is a light shielding region by a non-transparent material, and R2 is a light shielding region by a transparent material. As shown in FIG. 16, the light-shielding region by the non-transparent material can be detected by the measurement threshold value P1, but the light-shielding region R2 by the transparent material cannot be detected by the measurement threshold value P1. Therefore, by changing the measurement threshold value P1 to P1 ′ higher than P1, it is possible to reliably detect the light-shielding region by the transparent body as the edge position.

However, if the measurement threshold value P1 is set too high, noise may be erroneously detected in a usage environment with many noise factors as shown in FIG. FIG. 17 is a diagram illustrating an example of the received light amount distribution in a case where the pixel position where the received light amount is reduced due to noise is erroneously detected as the edge position by the measurement threshold value P <b> 1 ′. In such a case, it is necessary to further change the measurement threshold P1 'to a low value that is not affected by noise.

In the present embodiment, the measurement threshold value P1 can be changed according to the user's usage environment (noise factor), the transparency of the measurement object to be measured, and the like, so that the measurement threshold value P1 is set appropriately. It is possible to detect the edge position of the measurement object having various transparency without being affected by noise. Although there is a risk that the edge position may be shifted by changing the measurement threshold value P1, this slight positional shift often does not cause a problem depending on the accuracy requirement of the user (the width of the tolerance range). In addition, the relative distance relationship between the projector 1 and the light receiver 2 is rarely changed after being fixed once. Therefore, even if the measured value is slightly deviated from the actual value, the measured value itself does not fluctuate. For example, based on the fluctuation range from the measured value of the measurement object for which dimensional accuracy is guaranteed, OK / When the NG determination is performed, the deviation of the edge position is not a problem at all.

FIG. 18 is a schematic diagram illustrating lighting patterns of the light incident area display unit 35 and the measurement area display unit 36 when the measurement target is a transparent body. FIG. 18A shows an example in which the light shielded by the transparent body is small and the edge position of the transparent body cannot be detected properly. In this state, all the light incident area display part 35 are turned on and all the measurement area display parts 36 are turned off, and the user can detect the edge position of the transparent body to be measured with the current setting of the measurement threshold value P1. It can be confirmed that it is not. FIG. 18B shows the lighting patterns of the light incident area display unit 35 and the measurement area display unit 36 when the SW 44 provided in the controller 3 is operated and the measurement threshold value P1 is changed to a value higher than P1. It is a schematic diagram shown. It can be seen that, by changing the measurement threshold value P1, the measurement area display unit 36 corresponding to the light shielding area is turned on in the measurement mode for measuring the light shielding area, and the edge position of the transparent body can be detected. In the present embodiment, an example in which the incident light display threshold value P2 for turning on the incident light region display unit 35 is the same as the measurement threshold value P1 is shown. Is turned off.

As described above, in the present embodiment, when the measurement threshold value P1 needs to be changed, the measurement threshold value P1 can be changed while checking the light incident region display unit 35 and the measurement region display unit 36. In particular, since the measurement region display unit 36 can confirm the measurement region in which the dimension value is actually calculated, the measurement threshold value P1 can be changed so as to obtain a desired measurement region while confirming the measurement region display unit 36.

As described above, the measurement area serving as a reference for calculating the dimension value is determined based on the measurement mode set by the user and the light shielding area by the measurement object. The area to be detected as the light shielding area changes as the measurement threshold value P1 is changed. Therefore, the measurement area display unit 36 for displaying the measurement area updates the lighting pattern in real time following the change when the measurement mode or the measurement threshold value P1 is changed and the measurement area is changed. Therefore, when changing these settings, the user may change the settings until a desired measurement area is obtained while confirming a change in the lighting pattern of the measurement area display unit 36.

The incident light display threshold value P2 for turning on the incident light region display unit 35 may be the same as or different from the measurement threshold value P1. FIG. 19 is a comparison diagram of received light amount distributions of the light incident region display unit 35, the measurement region display unit 36, and the light receiver 2. In the example of FIG. 19, an example is shown in which the incident light display threshold value P <b> 2 for turning on the incident light region display unit 35 is set separately from the measurement threshold value P <b> 1. The amount of light received in the light shielding area shielded by the measurement object is below the threshold values for measurement P1 and the threshold value for incident light display P2. On the other hand, although the amount of light received in the light shielding area by dust is below the incident light display threshold P2, it is not below the measurement threshold P1, so the light incident area display portion 35 corresponding to the dust light shielding area is turned off. It is not detected as an edge position for measurement. Therefore, the light shielding area due to dust is not reflected in the lighting pattern and the measurement value of the measurement area display unit 36 at all. Thus, by setting the incident light display threshold value P2 to a value higher than the measurement threshold value P1, before the abnormal measurement value is output, the decrease in the amount of received light due to dust or dirt and its specific location I understand. Therefore, the user can perform maintenance at an appropriate time.

In the present embodiment, the plurality of LEDs constituting the light incident area display section 35 and the plurality of LEDs constituting the measurement area display section 36 are arranged in two rows, but it is not necessarily such an arrangement, It is also possible to include the functions of both the light incident area display unit 35 and the measurement area display unit 36 in a plurality of LEDs arranged in a line in the dimension measurement direction. FIG. 20 is a diagram showing a modification of the display unit 34. In the example of FIG. 20, LEDs that emit light in two colors are used, the LED corresponding to the light incident area is caused to emit light in red, for example, and the measurement area corresponding to the measurement mode is lit in green, which is a different color from the light incident area. I am letting. In the example of FIG. 20, an outer diameter measurement mode is selected in which a measurement is performed between one edge position and the last edge position from one end of the dimension measurement area. In addition, the first display pattern mode for turning on the LED corresponding to the light incident area and the second display pattern mode for turning on the LED corresponding to the measurement area may be provided so as to be switchable. For example, the first display mode may be switched during optical axis adjustment, and the second display mode may be switched during normal measurement. In addition, the second display mode can be set only when the measurement mode is set.

In any of the above-described embodiments, the user can directly set the measurement mode from the outside by the SW 44 provided in the controller 3, and the light receiving device 2 is provided with the display unit 32 indicating the light incident region or the measurement region. showed that. However, depending on the user, an external control device (for example, a personal computer) is connected to the controller 3 to monitor the received light amount distribution and analyze whether or not the measurement threshold value P1 and the measurement mode are appropriately set. In this case, a control program is installed in the external control device 60 connected to the external I / F 45 of the controller 3, and various settings of the transmission type dimension measuring device are executed from the external control device 60. FIG. 21 is a diagram showing an example of a measurement mode setting screen displayed on the external control device 60.

When it is desired to set the measurement mode with the external control device 60, the control program installed in the external control device 60 is activated to display the measurement mode setting screen shown in FIG. The user activates the setting tab 54 and selects a measurement mode from the measurement mode setting window 50. Subsequently, by clicking the transfer button 51, a setting signal corresponding to the selected measurement mode is transmitted to the controller 3. The MCU 41 of the controller 3 that has received the setting signal via the external I / F 45 stores the measurement mode corresponding to the received setting signal in the EEPROM 43, and the MCU 41 automatically executes the calculation of the dimension value corresponding to the stored measurement mode. To do. When the user clicks the read button 52, setting information such as the measurement mode currently set in the transmission type dimension measuring apparatus and the measurement threshold value P1 is read and automatically reflected in the setting tab 54.

When the external control device 60 is connected to the controller 3 and the control program of the external control device 60 is activated, the MCU 41 of the controller 3 acquires the received light amount distribution received by the light receiver 2 and subsequently transmits it to the external control device 60. To do. In addition, a signal indicating a measurement area that is a reference for calculating a dimension value corresponding to the set measurement mode and the light shielding area, and a signal indicating a light incident area having a light reception amount equal to or greater than the above-described measurement threshold value P1, The calculated dimension value is transmitted to the external control device 60. When monitoring such information by the external control device 60, the user may activate the monitor tab 55.

FIG. 22 is a diagram illustrating an example of a monitoring screen for the received light amount distribution by the external control device 60. On the received light amount distribution monitor window 53, the received light amount distribution W and the measurement threshold value P1 are displayed in a comparable manner. The horizontal axis indicates the pixel position of the CCD 29, that is, the width of the dimension measurement area, and the vertical axis indicates the amount of light received at each pixel position.

On the upper part of the received light amount distribution monitor window 53, the measurement area bar display unit 56 for displaying the measurement area received from the controller 3 with a bar in a state where the horizontal axis coincides with the window 53 and the incident area are displayed with a bar. A light incident area bar display unit 57 to be displayed is displayed. Further, in order to make the measurement area easier to recognize, a guideline 59 is extended and displayed on the received light amount distribution monitor window 53 from both ends of the measurement area shown on the measurement area bar display unit 56. In addition, the dimension value acquired from the controller 3 is displayed in the dimension value display window 58.

According to the present embodiment, the user can not only check whether the edge position is properly detected by comparing the measurement threshold value P1 with the received light amount distribution W, but which region on the received light amount distribution is actually It can be easily grasped by checking the measurement area bar display unit 56 whether the measurement area is set. If the user-desired measurement area is not set, it is only necessary to return to the setting tab 54, send another measurement mode to the controller 3, and perform monitoring again on the monitor tab 55, which is very convenient for the user. In this embodiment, a signal indicating the measurement region is received from the controller 3 and displayed on the measurement region bar display unit 56. However, only the received light amount distribution and the edge position information are acquired from the controller 3, The measurement area may be calculated and displayed based on the measurement mode stored in the control device 60. Further, the display form of the measurement area is not limited to the bar display described above. For example, the measurement area can be distinguished from other areas by changing the display color or display mode of the received light amount distribution W. Variations and changes may be made.

In the above embodiments, the display unit 34 is provided in the light receiver 2, but it is needless to say that the display unit 34 may be provided in the projector 1. In this case, the same display is possible in the projector 1 by communicating the light receiving state in the photodetector 2 to the projector 1 via the controller 3. In addition, it is possible to provide the display unit 34 in both the projector 1 and the light receiver 2. Further, the measurement principle is not limited to the CCD method, and the measurement principle can be applied to the above-described transmission-type dimension measuring device. The present invention is not limited to the embodiments described herein, and various modifications and changes can be made as necessary without departing from the gist of the present invention.

It is a system configuration figure in this embodiment. It is a block diagram for demonstrating the internal structure of the light projector 1, the light receiver 2, and the controller 3 in this Embodiment. It is an external appearance perspective view of the light receiver 2 in this Embodiment. It is another external appearance perspective view of the light receiver 2 in this Embodiment. It is a figure which shows the example of the lighting pattern of the light-incidence area | region display part 35 in this Embodiment. It is a figure which shows the example of the lighting pattern of the light-incidence area | region display part 35 when an optical axis offset generate | occur | produces in this Embodiment. It is a figure which shows the example of the lighting pattern of the light-incidence area | region display part 35 in case the optical axis corresponds completely in this Embodiment. It is a figure which shows the 1st modification of the light-incidence area | region display part. It is a figure which shows the 2nd modification of the light-incidence area | region display part. It is a figure which shows the example of the lighting pattern of the light-incidence area | region display part 35 when dirt has adhered to the light projection surface or the light-receiving surface. It is a figure which shows the example of the lighting pattern of the measurement area | region display part. It is the figure which showed typically the change of the lighting pattern of the measurement area | region display part 36 at the time of a user switching a measurement mode during the measurement of the same measuring object. It is a figure which shows the example of the lighting pattern of the light-incidence area | region display part 35 in the 2nd Embodiment, and the measurement area | region display part 36. FIG. It is a figure for demonstrating the lighting pattern of each display part in case the light-incidence area | region display part 35 and the measurement area | region display part 36 are arrange | positioned in parallel. It is a figure which shows received light amount distribution in case the relative distance of the light projector 1 and the light receiver 2 differs. It is a figure which shows the relationship between the light reception amount distribution at the time of a transparent body measurement, and the measurement threshold value P1. It is a figure which shows the relationship between the light reception amount distribution in the usage environment with many noise factors, and the measurement threshold value P1. It is a figure which shows the change of the lighting pattern of the light-incidence area | region display part 35 and the measurement area | region display part 36 at the time of changing the measurement threshold value P1 at the time of a transparent body measurement. It is a comparison figure of light reception amount distribution of the light-incidence area | region display part 35, the measurement area | region display part 36, and the light receiver 2. FIG. It is a figure which shows the modification of the display part. It is a figure which shows an example of the setting screen of the measurement mode displayed on the external control apparatus. It is a figure which shows an example of the monitoring screen of received light amount distribution by the external control apparatus. It is a conceptual diagram for demonstrating the measurement area | region of each measurement mode.

1 Projector 2 Receiver 3 Controller 10 Projection Slit 11 LD (Laser Diode)
12 Laser drive circuit 13 MCU
15 Light Emitting Lens 20 Light Receiving Slit 21 Lower Casing 22 Front Cover 23 Upper Casing 29 CCD
34 Display 35 Light-incident area display 36 Measurement area display 37 Optical axis coincidence display LED
50 Measurement mode setting window 53 Light intensity distribution monitor window 56 Measurement area bar display

Claims (7)

A projector comprising: a light emitting element that emits light; a light projecting lens that converts light emitted from the light emitting element into parallel light; and a light projecting slit for emitting the parallel light to the outside;
A light receiving device comprising a light receiving slit for entering the parallel light and a light receiving element for receiving the light incident on the light receiving slit;
A controller connected to at least the light receiver and executing drive control of the light receiving element;
A transmission type dimension measuring device that forms a dimension measuring area between the light projecting slit and the light receiving slit by disposing the light projector and the light receiver at a predetermined interval,
Based on a light reception signal output from the light receiving element, a light shielding area detecting means for detecting a light shielding area by a measurement object arranged in the dimension measurement area out of the light incident on the light receiving element;
A measurement mode selection means for accepting selection of one measurement mode from a plurality of measurement modes for selecting a start point and an end point of a measurement area calculated as a dimension value in relation to the light shielding area in the dimension measurement area;
Dimension value calculating means for calculating a dimensional value of the measurement region based on the selected measurement mode and a light shielding region by the measurement object;
A plurality of indicator lamps provided in at least one of the projector and the light receiver and arranged in a row corresponding to each region dividing the width in the dimension measurement direction of the dimension measurement area, and by the dimension value calculation means the calculated dimension value to correspond to the selected measurement mode, the measurement region and a measuring region display section that identifiably displayed and the other region by the lighting pattern corresponding to the measurement mode of the plurality of display lamps A transmission type dimension measuring apparatus characterized by the above. The measurement mode selection means is means for executing measurement mode selection by operating an operation switch provided in the controller.
The transmission type dimension measuring apparatus according to claim 1, wherein the measurement area display unit updates a lighting pattern of the plurality of indicator lamps in accordance with a change of a measurement mode by the operation switch. The measurement mode selection means can set an arbitrary measurement area by selecting a start point and an end point of an arbitrary measurement area associated with the light shielding area in a state where the measurement area display unit displays the measurement area. ,
The measurement area display unit displays an arbitrary measurement area set by the measurement mode selection unit so as to be distinguishable from other areas by updating a lighting pattern of the plurality of indicator lamps. 2. The transmission type dimension measuring apparatus according to 2. The light shielding area detecting means is means for detecting a light shielding area by comparing a light reception signal output from the light receiving element with a predetermined threshold value,
In a state where the measurement area display unit displays the measurement area, the measurement area display unit further includes a threshold changing unit for changing the threshold.
When the threshold value is changed by the threshold value changing means and the area detected by the light shielding area detecting means as the light shielding area changes, the plurality of measurement area display units follow the change of the measurement area based on the change of the light shielding area. 4. The transmission type dimension measuring apparatus according to claim 1, wherein the lighting pattern of the indicator lamp is updated. The measurement area display unit is provided on the upper surface side facing the bottom surface of the light receiver on which the light receiver is installed, and the width of the measurement area display unit in the arrangement direction of the plurality of indicator lamps is the dimension measurement area. The transmission type dimension measuring apparatus according to any one of claims 1 to 4, wherein the transmission type dimension measuring apparatus is provided so as to be substantially the same as a width in a dimension measuring direction. A light incident area display unit comprising a plurality of indicator lamps arranged side by side with the measurement area display unit is further provided. 6. The transmission type dimension measuring apparatus according to claim 1, wherein a light incident area having a quantity is displayed so as to be distinguishable from other areas. A projector comprising: a light emitting element that emits light; a light projecting lens that converts light emitted from the light emitting element into parallel light; and a light projecting slit for emitting the parallel light to the outside;
A light receiving device comprising a light receiving slit for entering the parallel light and a light receiving element for receiving the light incident on the light receiving slit;
Comprising at least a controller connected to the light receiver and executing drive control of the light receiving element;
Control of an external control device connected to a transmission type dimension measuring apparatus that forms a dimension measuring area between the light projecting slit and the light receiving slit by disposing the light projector and the light receiver at a predetermined interval. A control program for performing
Selecting one measurement mode from a plurality of measurement modes for selecting a start point and an end point of the measurement area calculated as the dimension value in relation to the light shielding area in the dimension measurement area;
Transmitting a setting signal for setting the measurement mode selected in the step to the controller;
A light receiving amount distribution received by at least the light receiver from the controller is acquired, and in addition to the light receiving amount distribution, a measurement region determined based on the light shielding region and the selected measurement mode is the selected measurement mode. And a step of displaying on the display screen in correspondence with the control program.

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