JP4745733B2 - Electronic level - Google Patents

Description

  The present invention relates to an electronic level (level scale) provided with a compensator (automatic optical path correction mechanism) for enabling measurement even if it is slightly tilted, and more particularly to an apparatus capable of detecting the limit of the compensator's correctable range.

  As an electronic level equipped with a compensator, the one disclosed in Patent Document 1 below is known. This photoelectron level is shown in FIG. This electronic level includes a collimating telescope including an objective lens unit 11, a focusing plate 17, and an eyepiece unit 14, and a compensator 12 and a beam splitter 13 are disposed between the objective lens unit 11 and the focusing plate 17.

  The image coming from the measurement point passes through the objective lens unit 11 and the compensator 12, and is divided into two by the beam splitter 13. One is formed on the focusing screen 17, and the other is upright on the CCD linear sensor 15. Form an image. The electric signal output from the CCD linear sensor 15 is processed by the arithmetic processing unit 16 so that the height and distance of the scale can be automatically measured. The arithmetic processing unit 16 includes an amplifier 161, a sample hold 162, an A / D converter 163, a RAM 164, a clock driver 165, and a microcomputer 166. A display unit 167 and a key operation unit 550 are connected to the arithmetic processing unit 16.

  As shown in FIG. 5, the compensator 12 uses four trapezoidal suspension lines 122 for the main body 120 and suspends the suspended optical member 121 from the bottom of the trapezoid. A mirror 123 and a prism 125 are fixed before and after the lower surface of the main body 120, and a mirror 124 is fixed to the upper surface of the suspended optical member 121. The image that has passed through the objective lens unit 11 is reflected by the mirror 123, the mirror 124, and the prism 125, passes through the beam splitter 13, and forms an erect image on the focusing screen 17 and the CCD linear sensor 15. . For this reason, even if the main body 120 is slightly inclined, the electronic level can be measured with the collimation axis automatically kept horizontal by the suspension optical member 121 being appropriately kept horizontal.

  By the way, since the suspended optical member 121 of the compensator 12 is suspended by four suspension lines, if the suspended optical member 121 is used in a place where there is a lot of vibration, the suspended optical member 121 may not stop oscillating and accurate measurement may not be possible. . Therefore, the electronic level disclosed in the following patent document includes an inclination angle detection unit 500 that detects the inclination angle of the main body 120 of the suspension optical member 121 (see FIG. 4).

  In the tilt angle detection unit 500, a pair of light emitting / receiving units 127 a and 127 b are disposed below the hanging optical member 121, and the reflection mark 126 is fixed to the bottom surface of the hanging optical member 121. The light emitting / receiving units 127a and 127b are caused to emit light in response to an instruction from the microcomputer 166 via the light emitting unit driver 510, receive light reflected by the reflection mark 126, and output an electrical signal. Outputs from the light emitting / receiving units 127a and 127b are input to the microcomputer 166 of the arithmetic processing unit 16 through the A / D converters 520a and 520b. The microcomputer 166 calculates the tilt angle of the main body 120 using the fact that the suspended optical member 121 is horizontal based on the outputs from the pair of light emitting / receiving units 127a and 127b.

Thus, if the tilt angle of the suspended optical member 121 with respect to the main body 120, that is, the tilt angle of the electronic level, is calculated, measurement errors in the height and distance of the scale can be corrected by this tilt angle, and accurate leveling can be performed.
JP-A-9-145358

  By the way, in the electronic level disclosed in Patent Document 1, in order to detect the inclination angle of the electronic level, the light emitting unit driver 510, the plurality of light emitting / receiving units 127a and 127b, and the plurality of A / D converters 520a and 520b are used. Since a large number of new parts such as the tilt angle detection unit 500 and the reflection mark 126 are required, there is a problem that the cost becomes higher than the conventional electronic level.

  The present invention has been made in view of the above-described problem, and the electronic level provided with the compensator is reduced in the electronic level while suppressing the increase in price by minimizing the number of newly required parts. It is an object to be able to detect.

In order to solve the above-mentioned problem, the invention according to claim 1 is an electronic level including a telescope optical system having a compensator that keeps the collimation axis horizontal and a linear sensor that forms an image of the scale.
In the telescope optical system, a light emitting unit that emits a light beam that is separated from the collimating axis and is emitted in parallel to the collimating axis is disposed in front of the compensator, and the light emitting unit on the linear sensor is disposed on the linear sensor. An arithmetic processing unit that calculates the electronic level tilt angle from the imaging position, and an alarm device that issues an alarm when the electronic level tilt angle reaches the limit of a range in which the collimator can horizontally correct the collimation axis And is provided.

According to the first aspect of the present invention, in the electronic level telescope optical system, in front of the compensator, a light emitting unit that emits light rays away from the collimation axis and parallel to the collimation axis is disposed , An arithmetic processing unit that calculates an inclination angle of the electronic level from an imaging position of the light emitting unit on the linear sensor, and a limit of a range in which the inclination angle of the electronic level can be corrected horizontally with the compensator Since an alarm device that issues an alarm when the value reaches the value is provided, inappropriate measurement can be prevented without fail. At this time, since the new part is only the light emitting part provided in front of the compensator, the price does not increase and it is economical. Also, if the tilt angle of the electronic level is displayed on the display unit, the operator can determine how much the compensator is working normally from the tilt angle and the extent to which the compensator can correct the collimation axis horizontally. it is possible to know whether or not there is a surplus, when the compensator is working normally Ru can work with peace of mind.

  Hereinafter, an embodiment of an electronic level equipped with a compensator of the present invention will be described based on the drawings. FIG. 1 is a side view of an electronic level telescope optical system according to an embodiment of the present invention. FIG. 2 is a plan view relating to the telescope optical system. FIG. 3 is a view showing an image formed on an electronic level CCD linear sensor.

As shown in FIGS. 1 and 2, the electronic level includes an objective lens unit 11 composed of an objective lens 11a and a focusing lens 11b, a compensator 12, a beam splitter 13, a focusing plate 17, and a telescope optical system. An eyepiece 14 and a CCD linear sensor 15 are included. In the telescope optical system, an LED (light emitting diode) or an LD (laser diode) that emits a light ray R in front of the compensator 12 and away from the collimation axis L and parallel to the collimation axis L. And a collimation lens 4 that forms an image of the light source 2 on the CCD linear sensor 15. The CCD linear sensor 15 that has received the light emitted from the light source 2 outputs an electrical signal, and this electrical signal is input to the arithmetic processing unit 16 via the amplifier 18 and the A / D converter 19. The arithmetic processing unit 16 calculates the tilt angle of the electronic level based on the output of the CCD linear sensor 15 and displays it on the display unit 167.

  Further, the arithmetic processing unit 16 determines whether or not the inclination angle of the electronic level has reached the limit of a range in which the collimator 12 can horizontally correct the collimation axis, and displays the determination result on the display unit 167. In addition, when the limit of the range in which the collimation axis can be corrected horizontally is reached, a program for causing the alarm 169 to issue an alarm with sound, light, or both sound and light is incorporated.

  In addition, the arithmetic processing unit 16 appropriately controls the luminance of the light source 2 via the LED driving unit 20 so as to easily detect a scale (not shown) installed at the measurement point. In addition, the light emitting unit 6 including the light source 2 and the collimation lens 4 is arranged to be separated from the collimation axis L of the collimating telescope to some extent in the lateral direction and the vertical direction so as not to disturb the light coming from the scale. A light ray R is emitted in parallel with the axis L. Furthermore, in order to avoid an increase in cost, the tilt angle detection unit 500 for correcting the measurement error of the height and distance of the staff due to the tilt angle of the suspended optical member 121 is omitted.

  Except for the above, this electronic level is the same as the conventional one shown in FIGS. Note that when the suspension optical member 121 swings to the limit of the range in which the collimation axis can be corrected horizontally, the swing optical member 121 is restricted by a stopper (not shown).

  Next, the electronic level operation will be described. The CCD linear sensor 15 has pixels (pixels) arranged in a line, and pixel numbers are assigned in order from one end side. The light beam R emitted from the light emitting unit 6 enters the CCD linear sensor 15 through the compensator 12 and the beam splitter 13, and forms the light emitting unit image 7 on the CCD linear sensor 15 as shown in FIG. . On the other hand, the measure installed at the measurement point is also formed on the CCD linear sensor 15 as a measure image 8 as shown in FIG. Since the light emitting portion 6 is small and extremely close, the light emitting portion image 7 is a narrow image having a large peak value and can be clearly distinguished from the standard image 8. When the electronic level is inclined, the incident angle of the light beam R emitted from the light emitting unit 6 to the mirror 124 fixed to the suspended optical member 121 changes, and the light emitting unit image 7 moves from the solid line position to the broken line position 7 '.

  The position of the light emitting unit image 7 in a state where the electronic level is completely horizontal (pixel number at the solid line position in FIG. 3) and the movement amount 9 (the number of pixels) by which the light emitting unit image 7 moves according to the inclination angle of the electronic level. ) By an experiment or the like and stored in the arithmetic processing unit 16. Thus, the arithmetic processing unit 16 calculates the tilt angle of the electronic level from the position (pixel number) of the light emitting unit image 7 and makes the tilt angle the display unit 167. By looking at the tilt angle of the electronic level, the operator can determine whether there is a margin within the range in which the compensator 12 can normally operate from this tilt angle or the limit of the range in which the collimation axis can be corrected horizontally. Alternatively, it is possible to know whether the limit of the range in which the collimation axis can be corrected horizontally has been reached. As a result, the operator can work with peace of mind when the compensator 12 is operating normally, and when the compensator 12 reaches the limit of the range in which the collimation axis can be corrected horizontally, the measured value is displayed. By discarding, it is possible to prevent a measurement value having a large error from being obtained.

  Further, the arithmetic processing unit 16 determines whether or not the limit of the range in which the collimator 12 can horizontally correct the collimation axis has been reached from the inclination angle of the electronic level, and displays the determination result on the display unit 167. When the limit of the range in which the collimating axis by the compensator 12 can be corrected horizontally is reached, the alarm device 169 gives an alarm by sound, light or both sound and light, and stops the operation at the electronic level. . Thus, it is possible to prevent measurement using an electronic level that is tilted so that the collimator 12 cannot horizontally correct the collimation axis, and it is possible to reliably prevent a measurement value having a large error from being obtained.

  Moreover, at this electronic level, the light emitting unit 6 is provided in the conventional one, and it is economical because only a simple modification for correcting the program of the arithmetic processing unit 16 is required.

It is a side view regarding the telescope optical system of the electronic level which concerns on one Example of this invention. It is a top view regarding the telescope optical system of the said electronic level. It is the figure which showed the image imaged on the CCD linear sensor in the said electronic level. It is a figure explaining the conventional electronic level. It is a figure explaining the compensator used for the conventional electronic level.

Explanation of symbols

6 Light Emitting Unit 12 Compensator 15 CCD Linear Sensor 16 Arithmetic Processing Unit

Claims (1)

In an electronic level comprising a telescope optical system having a compensator that keeps the collimation axis horizontal and a linear sensor on which the scale forms an image,
In the telescope optical system, a light emitting unit that emits a light beam that is separated from the collimating axis and is emitted in parallel to the collimating axis is disposed in front of the compensator, and the light emitting unit on the linear sensor is disposed on the linear sensor. An arithmetic processing unit that calculates the electronic level tilt angle from the imaging position, and an alarm device that issues an alarm when the electronic level tilt angle reaches the limit of a range in which the collimator can horizontally correct the collimation axis electronic level, characterized in that a and.

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