JPH0449526Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device for calibrating an optical measuring device that measures the dimensions of a test object using the shadow of the test object that interrupts the optical path.

2. Description of the Related Art Measuring devices generally require calibration in order to maintain measurement accuracy, and the same applies to the above-mentioned optical measuring devices. In this case, a calibration gauge of known size is used as a means for calibration. The procedure is to prepare several sizes of calibration gauges that match the equipment, take measurements for each calibration gauge, and check the inside of the equipment so that the value indicated by the measurement result more accurately represents the value of the calibration gauge. The arithmetic constants are corrected.

Problems that the invention aims to solve When performing the above calibration, the calibration gauge is placed on the optical path of the measuring device and the value on the display section is read. are often installed in large-scale mechanical equipment, etc., and the display section is usually installed in a control room, etc. together with the calculation section, so each time the calibration gauge is replaced, the control room and detection section are You need to go back and forth between the two. Alternatively, it is a two-person job, with one person in the control room and the other near the detection unit replacing the calibration gauge. Furthermore, although the sizes of the calibration gauges vary in proportion to their sizes, their shapes are very similar, so there are cases where a calibration gauge of a size different from that required for calibration is attached.

The present invention was conceived to solve the above problems, and its purpose is to provide a calibration device that can automatically position calibration gauges of different sizes on an optical path.

Means for Solving the Problems In order to achieve the above purpose, the calibration device of the present invention has the following features:
Applicable to a device that calibrates a measuring device that measures the dimensions of a test object using the shadow of the test object that blocks the optical path, the present invention includes a plurality of cylindrical calibration gauges each having different representative dimensions;
A setting part for specifying one calibration gauge from among the plurality of calibration gauges, a plurality of calibration gauges are attached with their center axes substantially the same, and the plurality of calibration gauges are moved along the direction of the center axis of the calibration gauge. By doing so, the configuration includes a driving section that positions the calibration gauge designated by the setting section on the optical path. When calibration is not to be performed, the plurality of calibration gauges are moved along the circumference to remove the calibration gauges from the optical path.

Operation One calibration gauge is specified from among a plurality of calibration gauges by the setting section, and the calibration gauge is positioned on the optical path by the driving section. The measuring device is then calibrated based on the representative dimensions of this calibration gauge placed on the optical path. Next, a calibration gauge with another representative dimension is designated by the setting section, and the driving section positions the calibration gauge on the optical path, and similarly calibrates the measuring device. Thereafter, the same operation is repeated for other calibration gauges to complete the calibration of the measuring device.

Embodiment FIG. 1 is an external perspective view showing an embodiment of the present invention.

In the figure, a light receiving section 122 having a light receiving window 123 at an opposing position is attached to the front surface of the light projecting side of a light projecting section 121 that generates parallel light beams using, for example, a halogen lamp, a lens, etc. (not shown). The parallel light passes through the light receiving window 123 and reaches the sensor in the light receiving section 122. The optical path 12 is a path for this parallel light beam, and when this path is blocked, the light receiving window 1
A shadow appears on 23.

Three types of cylindrical calibration gauges 11a to 11c (hereinafter simply referred to as calibration gauges 11) each having a different representative dimension with their respective diameters are manufactured by machining a single cylinder, and have three different diameters.
The seed cylinders are connected in the axial direction according to their diameters. The calibration gauge 11 is attached to a drive mechanism 142 via a support shaft 141, and a gear mechanism and a motor (not shown) built into the drive mechanism 142 allow the calibration gauge 11 to be attached to the central axis of the calibration gauge 11. direction (direction indicated by arrows 98, 99).

The drive mechanism 142 is connected to a rotation shaft 151 of the rotation mechanism 15 by the support arm 16, and the drive mechanism 142 can rotate around this rotation shaft 151. In other words, the calibration gauge 11 is movable along the circumference around the rotating shaft 151.

FIG. 2 is a block diagram showing the mechanical and electrical parts of the device of the present invention.

A setting unit 17 provided for selecting and specifying the calibration gauge 11 sends signals to both a control unit 143 that controls the drive mechanism 142 and a control unit 155 that controls the rotation mechanism 15. is being carried out. The two control units 143 and 155 each send out an output for driving the drive mechanism 142 or rotation mechanism 15 that is the target of control, and also output from these mechanism units 142 and 15 to control its operation. A signal indicating the position is being input. The drive unit 14 includes a drive mechanism 142 and a control unit 143 that controls the drive mechanism 142.

The operation of the device according to the present invention will be explained below.

The center of the optical path 12 in FIG. 1, that is, the position where the calibration gauge 11 is placed, serves as a path for the object to be measured, such as a round bar, and its diameter is measured one after another at regular intervals while moving in the longitudinal direction. is now being carried out. Therefore, when normal measurements are being performed, the drive mechanism 142 is placed at a location away from the center of the optical path 12. The position for this purpose was selected so that the rotating shaft 151 was rotated 90 degrees counterclockwise when viewed from the lower left in FIG. There is.

When performing calibration, a signal from the setting section 17 is output to the control section 155, the rotation mechanism 15 is operated, and the drive mechanism 142 is moved to the position shown in FIG. Next, the representative dimensions to be calibrated are inputted from the setting section 17. Then, the control unit 143 controls the drive mechanism 142 so as to position the calibration gauge corresponding to the representative dimension on the optical path 12. Therefore, the drive mechanism 142 moves the calibration gauge 11 through the support shaft 141 in the direction of arrow 98 or in the direction of arrow 9.
Move it in the direction of 9. Figure 1 shows the calibration gauge 11
b shows the case where it is used for calibration, and the arithmetic constant of the measuring device is corrected so that the measured value indicating the length of the shadow 13 produced by the calibration gauge 11b better indicates the representative dimension.

When subsequently performing calibration for other representative dimensions, the calibration gauge 11 is moved by the drive mechanism 142. When using the calibration gauge 11c, movement is performed in the direction of arrow 99, and when using calibration gauge 11a, movement is performed in the direction of arrow 98. This movement is performed via the control section 142 according to a signal output from the setting section 17.

When the calibration is completed, the drive mechanism 142 is moved by the rotation mechanism 15 to a position where it does not interfere with the passage of the object to be measured and where it does not obstruct visual observation of the optical path 12.

Note that the present invention is not limited to the above embodiment, and the types of calibration gauges 11 are not limited to three types, but can be configured to have any other types, such as 10 types.

Further, by providing the setting section in the control section of the measuring device, it is possible to apply the present invention to an optical measuring device that automatically calibrates at regular intervals.

Furthermore, although the case where the optical path 12 is formed by parallel light beams from a lamp and a lens has been described, it is also applicable to an apparatus in which the optical path is formed by a laser beam.

Effects of the invention In the calibration device of the invention, the setting unit selects a calibration gauge with a representative dimension to be calibrated from among a plurality of calibration gauges with different representative dimensions, and the calibration gauge with the representative dimension is selected by the drive unit. Since the configuration is such that calibration gauges having different dimensions can be automatically positioned in the optical path.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the present invention;
FIG. 2 is a block diagram showing the mechanical and electrical parts of the device of the present invention. 11... Calibration gauge, 12... Optical path, 13...
Shadow, 14... Drive section, 17... Setting section.

Claims (1)

[Scope of utility model registration request] In a device that calibrates a measuring device that measures the dimensions of a test object using the shadow of the test object that blocks the optical path,
A plurality of cylindrical calibration gauges having mutually different representative dimensions, a setting section for specifying one calibration gauge from among the plurality of calibration gauges, and the plurality of calibration gauges are attached with their central axes substantially the same, a drive unit that positions the calibration gauge designated by the setting unit on the optical path by moving the plurality of calibration gauges along the central axis direction of the calibration gauge; A calibration device characterized in that the calibration gauge is removed from the optical path by moving the calibration gauge along a circumference.