JPH032812Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a data transmission device that transmits measurement data etc. obtained from a surveying instrument to a target.

(Background of the idea) In setting work such as general nailing work,
Since the points to be set are unknown at the site,
Temporarily set the target near the point to be set,
A procedure in which the coordinates are measured using a surveying instrument capable of distance and angle measurement, the amount of deviation from the coordinates of the point to be set is determined, the target is moved by this amount of deviation, and the coordinates are measured again using the surveying instrument. Take.

At this time, it is necessary to transmit the amount of deviation between the measured target coordinates and the coordinates of the point to be set from the surveying instrument side to the target side. Conventional methods for this transmission include: giving instructions with gestures; transmitting using radio waves using a transceiver; if the surveying instrument includes a light wave ranging device, modulating the ranging light source with voice or the data to be transmitted; etc. were publicly known.

However, each of the above methods has the following problems.

It is not possible to specify a specific quantity, only the direction.

(a) Because transceivers use radio waves, it is necessary to submit to the Ministry of Posts and Telecommunications.

(b) Noise caused by welding etc. is likely to occur.

(c) It is necessary to hold the transceiver by hand, which impairs operability.

(a) Since the spread of the light beam is small, if the target moves even slightly, it will be out of the rangefinder's light beam and transmission will no longer be possible.

(b) The distance measuring device system becomes complicated.

(Purpose of the invention) An object of the invention is to provide a data transmission device that eliminates these drawbacks.

(Means for Solving the Problems) The present invention provides a modulation device that modulates the light source of the collimator for collimation assistance according to transmitted data, and also receives the modulated light emitted from the light source on the target side. The above object is achieved by a data transmission device for a surveying instrument that is equipped with a demodulating light receiving device.

(Example) The present invention will be described below based on the example shown in the drawings.

FIG. 1 is an embodiment of the present invention, and is a diagram showing a cross section of a collimator for collimation assistance and a light receiving device, as well as a block of an electrical processing system. A collimator lens 2 is fixedly attached to the main body 1 of the collimator for collimation aid, and within the rear focal plane of the collimator lens 2 is a lens 2 that passes through the optical axis and is bounded in the vertical direction.
Two diffuser plates 3a and 3b are fixedly installed, and an illumination optical system 4 and a light source 5 are further arranged behind them. Since the light source 5 is disposed at the rear focal point of the illumination optical system 4, the diffusion plates 3a and 3b are illuminated almost uniformly from behind by the illumination optical system 4. The right and left diffusion plates 3a and 3b have different colors, for example, the left 3a is red and the right 3b is green. The light source 5 is turned on by a drive circuit 6.

In use, such a collimator for collimation aid has distance measurement and angle measurement functions such that its optical axis is parallel to the optical axis of the telescope of the surveying instrument 7,
It has a function that allows calculation of coordinate positions. The arithmetic circuit 8 outputs transmission data, for example, a signal corresponding to the amount of deviation between the coordinates of the point to be set and the target position, as transmission data, and the modulation circuit 9 receives this signal and inputs a modulation signal to the drive circuit 6. urge The light source 5 is thus modulated by the transmitted data.

The light receiving device 11 is fixed to the target 10 and has a condensing lens 12. A photoelectric conversion element 13 such as a photodiode is provided at the rear focal position of the condenser lens 12.
The photoelectric conversion signal is demodulated by a demodulation circuit 14 to extract transmission data, and this transmission data is displayed on a display 15.

FIG. 2 is a diagram illustrating the regions of light from the diffusing plates 3a and 3b, and among the emission light regions a, b, and c of the collimator lens 2, the region a is
Light from b is mixed, and area b is diffused by diffuser plate 3b.
In the region c, light comes only from the diffuser plate 3a. Therefore, as mentioned above, the diffusion plates 3a, 3
When the colors b are different, the target 10 can be set approximately on the optical axis of the telescope of the surveying instrument 7 by placing the target 10 within the area a where both colors can be seen almost simultaneously. Also, the measured data or the difference between the coordinates of the point to be set and the measured coordinates is sent from the surveying instrument 7 to the light source 5 via the modulation circuit 9 and the drive circuit 6.

On the target 10 side, the light receiving device 11
The transmitted optical signal is demodulated and displayed on the display 15.
Display the transmitted data.

Furthermore, although the present embodiment has been described as transmitting numerical data as the transmission data, it is also possible to transmit voice, weather conditions, etc.

Moreover, the configuration of the collimator for collimation assistance can be implemented in the same manner even when two color light sources are used, in addition to using two color diffusion plates. That is, a collimator lens, a reflecting member having at least two reflecting surfaces and branching the optical path of the collimator lens into at least two at approximately the focal position of the collimator lens, and an optical path within the optical path split by the reflecting member. In addition, even if the collimator lens has semiconductor light emitting elements (e.g. LEDs) as light sources disposed substantially on the optical axis of each collimator lens and emits visible light beams of different colors, two
One semiconductor light emitting element may be alternatively modulated with the data signal as described above.

Note that, of course, instead of modulating the light source with a drive signal, an optical modulator such as a Kelcell may be provided in front of the light source to obtain modulated light.

Further, although the above example uses a collimator configured to perform horizontal collimation, the same applies to a collimator configured to perform vertical collimation.

(Effects of the invention) By transmitting data by modulating the light source of the sighting aid collimator in this way, the following effects occur.

Not subject to restrictions by the Radio Law.

Since the emitted light from the collimator is more diffused than the ranging light from the light wave ranging device, it is possible to design a wide field of view.

The circuit system can be simplified.

Since it does not use the optical axis of light wave distance measurement, it can also be used for theodolites, levels, etc.

To summarize the effects of the present invention described above, since the light source of the collimator for collimation assistance is also used as a light source for optical data communication, not only data transmission can be performed easily, but also the light spread is large, so the light receiving device A data transmission device with a wide light-receiving area and good operability can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, showing a cross section of a collimator for collimation aid and a light receiving device, as well as a block of the electrical processing system. FIG. 2 shows the collimator for collimation aid shown in FIG. 1. FIG. 3 is a diagram for explaining regions of different colors due to emitted light. Explanation of symbols of main parts, 5...Light source, 6...Drive circuit, 8...Arithmetic circuit, 9...Modulation circuit, 11
... Light receiving device, 13 ... Photoelectric conversion element, 14 ...
Demodulation circuit.

Claims (1)

[Scope of utility model registration request] A surveying instrument characterized by being provided with a modulation device that modulates a light source of a collimator for collimation assistance according to transmission data, and a light receiving device that receives and demodulates the modulated light emitted from the light source on the target side. data transmission equipment.