JPS58113874A - Optical range finder - Google Patents

Abstract

PURPOSE:To facilitate operations such as alignment of an optical axis, by a constitution wherein both analog circuits on light-emitting and light-receiving sides are incorporated on one side in a case in relation to the optical axis of a collimating telescope. CONSTITUTION:A lens-barrel case 101 is divided into a central part 150, an upper part 152 and a lower part 155, and the central part 150 is fitted with an object lens 102, an eye lens 104 and an optical system 106. In the upper part 152, an analog circuit 151 consisting of a light-emitting element unit 153, a light- receiving element unit 154, an analog circuit 112 on the light-emitting side, and an analog circuit 113 on the light-receiving side, is housed. In the lower part 155, a digital circuit 114 is incorporated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a built-in structure of a light wave h'+ distance measuring unit, and relates to a type of light wave that can be used in common with the objective lens of a reference telescope and the objective lens of a distance measuring optical system. The present invention relates to a built-in structure of a ranging analog circuit in a distance meter in a device housing.

In recent years, optical rangefinders have been made compact enough to be mounted on transshifts and theodolites.

An optical system is used in which the objective lens of the reference telescope and the objective lens of the ranging optical system are shared. In addition, a light wave distance measurement system can be added to the telescope section of conventional transits and theodolites.
7, a light wave ranging theodolite was produced that was capable of not only distance measurement but also angle measurement. Furthermore, the angle can be detected photoelectrically using a rotary encoder, and the distance data and angle measurement data can be electrically displayed digitally, and the distance data and angle measurement data can be displayed in a digital manner. A so-called total station has been put into practical use that also has arithmetic processing functions.

By the way, in the inner S configuration of the lens barrel housing of a conventional optical distance meter, as shown in Fig. 7, the lens barrel housing sl is not shown. be supported so that it can rotate freely inside.

The hooked tube housing part l includes an objective lens 2% dichroic prism 85, a focusing lens 4, an erecting prism 5, and a reticle plate 6.
, a reference telescope consisting of a contact lens 7, and a dichroic prism 8 sandwiched from above and below (a light-emitting probe 8 and a light-receiving probe 0 each having a length of 1M, and a condenser lens), 0.11
It's been a long time since I've been in the middle of a long time. Further, the light emitting cable 8 is connected to the light emitting side analog circuit 12, and the light receiving element 9 is connected to the light receiving side analog circuit 1B, and both analog circuits 12, 18id digital circuit], 4a, 14bK are connected There is.

In the above-mentioned conventional light wave rangefinder, the light-emitting element is connected to the analog circuit on the light-receiving side that amplifies and processes the weak distance-measuring reflected light from the reflex l/lid and is photoelectrically converted by the light-receiving element. A strong signal from the analog circuit on the light emitting side was mixed in, causing a secondary error. In order to prevent this, in the conventional light wave distance meter, as shown in Fig. In order to separate it as much as possible, and because it was necessary to downsize the V body part so that the ψ barrel body part l could be rotatably supported by the support strut, we approached the telescope at 7 and separated it from the quasi-telephoto trace. I had it placed.

By the way, optical noodle making generally requires adjustment of optical axis alignment during assembly. In optical rangefinders as well, alignment of the optical axes of not only the reference telescope but also the ranging optical system, and in particular the positioning of the light receiving and emitting elements, are important. In addition, it is preferable for measurement that the light intensity level of the distance measuring optical path incident on the light receiving element 9 and the photoelectric level of the internal reference f amount are at the same level. The amount of light is controlled to the revised level, and the amount of distance measuring light that enters the rotation filter 4.8 is matched with the internal reference light needle for measurement. However, because the reference optical path is not constant due to the light receiving and emitting cables built into the optical distance meter, and the light receiving signal that has actually passed through the optical system must be adjusted while measuring, the light wave You can feel safe adjusting each distance meter.

In addition, it is not impossible to say that the electrical circuit's crossroad fA adjustment must be adjusted under the same model environment as the one used when actually incorporating it into the device and measuring it.In particular, in the case of a light wave distance meter, the characteristics of the optical system are Final adjustment is required for each combined lightwave distance meter.

However, as mentioned above, due to the necessity of separating the light receiving and emitting cable circuits, the conventional light wave distance meter is divided into a light receiving side analog circuit and a light emitting side analog circuit, and each circuit is separately arranged. Therefore, when making adjustments during assembly or maintenance, it is not possible to adjust the optical axis or adjust the light intensity level unless these two separate analog circuits are incorporated into the optical distance meter. However, since both analog circuits are arranged so as to sandwich the optical system, adjustment is extremely difficult.
Then, you must repeat the process of making all adjustments to the optical system, incorporating the analog circuit, and then, based on the measurement data, removing the other analog circuit and adjusting the optical system in between. I couldn't help it. In addition, because the shielding characteristics of analog circuits vary slightly, the measurement data changes each time, and it is difficult to make adjustments based on the data before removal. There was a shortcoming that led to the length of the process.

The present invention was made in order to solve the above-mentioned drawbacks of the conventional light wave distance meter, and its structural feature is that the objective lens of the standard telescope and the objective lens of the light wave distance measuring optical system are shared. In the optical distance meter that is built into the entire system, both the light emitting 11111 analog circuit and the light receiving side analog circuit are connected to the optical axis of the reference telescope.
'd It is built into one side of the body.

The optical wave distance IAk meter of the present invention configured as described above does not ratchet up the digital circuit, which operates normally even when connected to the analog circuit when separated from the optical system and placed outside the housing, during adjustment. This makes it possible to very easily align the optical axis and adjust the optical level from the side of the casing in which the digital circuit is to be housed. In addition, since the analog circuit is always connected to the optical system and the light receiving/emitting elements, accurate measurement data is always available, and the drowsiness line can be easily adjusted and tuned.

Furthermore, if the 10-stage pre-drilled bell adjustment is oriented in the reference source path on the opposite side to the side where the analog circuit is built-in, the light weight level adjustment can also be performed from the side of the casing that houses the digital circuit. It's very convenient.

15C), is divided into an upper part 152 and a lower part 155. The central part 150 includes an objective lens 102 and an eyepiece lens 1.
A light receiving element unit 15d, a light emitting element unit 154, and an analog circuit 151 consisting of a light emitting side analog circuit 112 and a light receiving side analog circuit 118 are housed in the hole 152 to which the optical system 106 and the optical system 106 are mounted. Lower part 155
i=r: The digital circuit 114→ is inside the cavity.

As shown in FIG. 3, the light receiving unit 158 includes a light receiving unit lens barrel 156. The light-receiving unit lens barrel 156 has a 1d width 71. A light receiving element 157 and a condensing lens 158. = Consists of a labor light optical fiber 159, a light-receiving optical fiber connector 160, and a third connector 169. The third connector 169 is inserted into the opening in the clay wall of the central portion 106. The light-emitting element unit 154 has a similar configuration to the light-receiving element unit 158, and includes a light-emitting unit barrel 165, a light-emitting element 166 built into the light-emitting unit barrel 165, a condensing lens 167, and a light-emitting optical fiber 1fi8. 'A third connector 169 for optical fiber optic fiber and third connector 169 to #4
'It will be done.' Further, a light intensity level adjusting concentration filter 171 for the internal reference optical path is arranged at the lower part of the central part 150. Chain plate filter 171 supported by rotating shaft 172
is disk-shaped and has a transmittance that changes continuously in the circumferential direction. The rotating shaft 172 is pivotally supported through the lower wall of the central part 150, and the rotating shaft 172 and the density filter 171 are rotated by the lower part 155, the height IW, and the width 178.
c! I was forced to roll over once.

In the above configuration, it is desirable that the light-receiving side analog section 11B and the light-emitting side analog section 112 are independently shielded.

Next, the electric circuit of the light wave ranging system will be explained based on FIG. The light wave ranging system has 1 light emission 11411 analog circuits] 1
2. Light receiving side analog circuit 118 and digital #Iam 1
It consists of 14 parts. The light-emitting side analog circuit 112 includes a reference oscillator 22 (1, a seventh frequency divider 221 which receives input from the reference oscillator 220 and outputs it to the light-emitting element 154; a first frequency divider 2).
．． 21 and the a-th frequency divider 228 and the divider/divider 22
m/mixer 22.4 which inputs 1 and 228
It consists of The light-receiving side analog circuit 118 includes a serial 7" 222 which receives input from the light-receiving element 157.
5 and a second mixer 225 and output to the r notal circuit 114. The digital circuit 114 includes a digital phase difference meter 227 to which the % reference oscillator 22 ( ), the λ-th frequency divider 228 , and the waveform shaper 226 are input.
．． Memory 2 d OH for digital phase difference meter circuit input
y'' Notal phase difference meter 227 and memo IJ-214 (+
It is composed of an operator 229 that inputs and outputs to a display 281.

Digital path 114 further includes control circuit 282 . In the above configuration, the light receiving side analog circuit 118 and the light emitting side analog circuit 112. It is desirable that it be independently shielded. When Hera is required to increase its sheath power, it is desirable to shield all the blocks shown in d+g+.

In the above electrical circuit, the reference frequency f from the reference oscillator 220. 1-3θMH2 is divided by //20 by the first frequency divider 221, f, == / , 5MH2
make a signal. This Iki number is sent to the light emitting element 154,
The light emitting element 154 emits light by infrared modulation of SMH2. The modulated light from the light emitting elements 154 is sent to the objective lens 1.
02, etc., to a reflector (not shown) that is connected to the target point, and is reflected there and returned to the objective lens 102.
The light reaches the light receiving cable 157 via etc. Light-receiving Sakuko 15?
The incident light flux is composed of a component of /5 MH1 and a component of a phase difference created by adjusting the distance to be measured. On the other hand, the signal of frequency f from the first frequency divider 221 is transmitted to the first frequency divider 2
213 VC is also supplied here //! ;The frequency is divided into 00 and 1g of TE f2:3KH2 is created. This signal is supplied to the seventh mixed gain 224, and the f from the first frequency divider 221.

A signal with a frequency of f5==f, -12=/, 97MH2 is created. This signal of frequency f is further supplied to the Ω-th mixer 225 of the analog circuit 218 on the light receiving side. This Ω-th mixer 225 is a preamplifier 7'22.
f, -f, == between the output signal supplied from 2
Create a beatdown signal for f, . Light receiving element 157
Since the signal from the Ω-th mixer 225 has a phase difference component corresponding to the measured distance, the output signal U f 2-3KH of the Ω-th mixer 225
z signal and a phase difference that is slightly different from the distance.

After this signal is waveform-shaped by a waveform shaper 226, it is supplied to a digital phase difference meter 227 of a digital circuit 2141. The signal of frequency f2 from the stone frequency divider 228 is supplied to the digital phase difference meter 227 as a reference number 1g, which detects a phase difference according to the measured distance, and calculates the magnitude of the detected phase difference. Frequency f from reference oscillator 220.

The measured distance is measured digitally using the signal , and is supplied to the computing unit 22.9 as the measured distance data.

As described above, since distance measurement is performed by a circuit having a large number of electric elements, response delays and drift phenomena of the electric elements affect the phase difference detection results and result in measurement errors. -■■-m points--■■For this reason, the light from the light emitting element 154 is sent directly to the light receiving element 157 inside the housing. With the light that passed through it? By comparing, the influence of response delay of the electric circuit is removed. Switching between the internal reference source path and the distance measuring optical path is performed by a shutter 241. The rLll true instrument 229 is a memo in which the data of the internal reference source path 240 measured by the same valley electric circuit as the one used for distance measurement is stored! J-2
Performance processing is performed between the data from 80 and the distance measurement data,
The data is corrected to the state that has the greatest influence on the electric circuit Lr4 and answer 4rL, and is output to the 1 display 281.

Note that the above processing control is performed under the control of the control 1Ll1M282.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of a conventional optical distance meter, FIG. 2 is a vertical sectional view of an embodiment, FIG. 3 is a horizontal sectional view of the embodiment, and FIG. 9 is an electric circuit diagram of the embodiment. 101... Lens barrel housing part, 102... Objective lens. 104... Eyepiece lens, 112... Light emitting side analog circuit, 118... Light receiving side analog circuit, 114...
Digital circuit, 150... Central part, 152... Upper part, 15B... Light receiving element unit, 154... Light emitting element unit, 159... Light receiving optical fiber. 171...Light level adjustment @degree filter~Patent applicant Tokyo Kogaku Jisai Co., Ltd. Figure 1 Figure 2 +52113, 151 112 153 °, /101 54 1 Temperature ゛...Constancy'...1, 2. . 4 Figure 3 Figure 4 381

Claims (1)

[Scope of Claims] ill In a light-wave distance needle that incorporates an optical system in a housing that shares the objective lens of a reference telescope and the objective lens of a light-wave distance measuring optical system, a light-emitting-side analog circuit and a light-receiving-side analog circuit are used. A light wave distance meter characterized in that both the circuit and the circuit are built into one side of the housing with respect to the optical axis of the reference telescope. 12. At least one of a light receiving element or a light emitting element. The optical distance meter according to claim 11, characterized in that the light receiving element and the light emitting element are arranged on the side where the analog circuit is built-in, and are spaced apart from each other. Claim No. 11 (Light wave distance meter according to claim 11) characterized in that the distance measuring optical system is connected by an optical fiber. A light wave distance meter according to claim 21 or 31. (5) The light amount level adjusting means arranged in the internal reference optical path of the light wave side path optical system is The optical distance meter according to any one of claims 11 to 41, characterized in that the optical distance meter is arranged on the opposite side of the analog circuit built-in side with respect to the optical axis of the telescope. The light-wave distance meter according to any one of claims 11 to 5, wherein the light-receiving analog circuit is shielded from another path.