JPH01170807A - Laser light receiver - Google Patents

Abstract

PURPOSE:To connect a laser light receiver to an external device with a pair of signal lines and to perform arbitrary data processing by digitally processing the signal from a photodetector and converting it to serial data by a one-chip CPU. CONSTITUTION:A light projector 103 is rotated on a horizontal plane to project a laser light 104, and this light is received by a laser light receiver 102 mounted on a construction vehicle 101. A photodetector 203 of the receiver 102 consists of elements T1, T2, etc., arranged in the vertical direction, and the electric signal of the photodetector 203 is converted to a digital signal by an amplifier 205 and a voltage comparator 206. A binary converter 207 converts the light reception position of the photodetector 203 to a binary and sends it to a one-chip CPU 208, and the CPU 208 performs the operation processing of light reception position data to display the result on a display device 209 and converts it to serial data to send it to the external device. Thus, the ruggedness of the ground or the inclination of the construction vehicle is measured.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to work vehicles at civil engineering work sites, carts in factories,
The present invention relates to a laser light receiving device that is mounted on a ship or the like at a port and is used for positioning a work vehicle or the like by receiving laser light projected from a projector provided at a predetermined position.

(Prior Art) A conventional laser light receiving device is shown in Fig. 4, which has a plurality of light receiving elements 3 arranged in alignment in the vertical direction.
A light-receiving element 301 of 01 that receives a laser beam emits an electric signal, which is amplified by an amplifier and sent to an external device.

(Problems to be Solved by the Invention) However, in the conventional laser light receiving device, the light receiving element 301
Each requires a signal line to connect to external equipment, which poses the problem of increasing the number of signal lines.

(Means and effects for solving the problems) In order to solve the above-mentioned problems, the present invention provides a laser beam having a plurality of light-receiving elements that receive a laser beam projected from a projector and convert it into an electric signal. In the light receiving device, there is a conversion device that converts the electrical signal into a digital signal, and a conversion device that converts the digital signal into a binary number.
The laser beam receiving device has a decimal converter and a one-deep C''PU that operates on a signal converted into a binary number and converts it into serial data.

(Example) The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a conceptual diagram of a case where a civil engineering vehicle 101 is equipped with a laser beam receiver 102 and receives a laser beam 104 from a projector 103 that rotates on a horizontal plane and emits laser beams to determine the unevenness of the ground. It is. The civil engineering vehicle 101 moves up and down depending on the unevenness of the ground.

Concomitantly, the laser light receiving device 102 mounted on the civil engineering vehicle 101 also moves up and down.

When the laser beam receiving device 102 moves up and down, the projector 10
The position where the laser beam 104 is horizontally projected from the laser beam receiving device W102 changes, and by measuring the position where the laser beam is received, the degree of unevenness of the ground can be measured.

FIG. 2 shows a schematic external view of the laser light receiving device of the present invention.

In FIG. 2, a pillar 201, for example, a regular square prism,
Light receiving elements 203 are arranged vertically on a substrate 202 fixed to four sides of the substrate.

Then, the light receiving elements in the same order counting from the bottom (for example, the fifth light receiving element from the bottom T5', T51', T, I
TT, T, and 1111 (T5Ill and T51111 are not shown) are arranged at the same height and connected in parallel.

204 is a signal processing board that shows an amplifier that amplifies the electrical signal from the light receiving element 203, a voltage comparator that shapes the waveform and converts it into a digital signal, a binary converter that converts it into a binary number, and a position where the light is being received. A display and one-chip CPU are installed.

FIG. 3 is a block diagram of signal processing transmitted by the light receiving element 203.

In this embodiment, ten light receiving elements 203 are arranged in the vertical direction from T to Tlo.

The electrical signal from the light receiving element 203 is amplified by an amplifier 205, and waveform-shaped by a voltage comparator 206 to become a digital signal.

The waveform-shaped electric signal is converted into a binary number indicating which light receiving element 203 is hit by the laser beam by a binary converter 207, and is sent to the one-chip CPO 208.

In this embodiment, an 8-bit one-chip CPU is used, so the 10° from T1 to T1° of the light receiving element 203 is
Since the main signal line cannot be directly connected to the input terminal of the one-chip CPU 208, the light receiving element 2
The light receiving position of 03 was converted into a binary number.

The one-chip CPU 208 converts the signal into serial data, transfers the signal to a terminal of an external device, and displays the light receiving position on a display 209.

For example, when the eighth light receiving element T8 receives a laser beam projected from a light projector (not shown) in the above configuration, the electrical signal transmitted by the eighth light receiving element T8 is transmitted to the amplifier 20.
5, the voltage comparator 206 shapes the waveform, and converts the signal into a digital signal.

Signal converted to digital signal (decimal number 8)
is converted into a binary number 101 miOO by the binary converter 207 and sent to the one-chip CPU 208-M-.

The one-chip 208 performs arithmetic processing such as averaging the data within a certain period of time on the electric signal of data representing the position where the light is being received, displays it on the display 209, and converts it into serial data. and send it to an external device.

In the above-described embodiment, one laser light receiving device is mounted on a civil engineering vehicle, but two laser beam receiving devices can be installed, one each on the front and rear of the civil engineering vehicle, to improve the slope of the civil engineering vehicle. One-chip CPU is used to transmit electrical signals when measuring
By setting the 8th digit of the electrical signal transmitted by s in advance, for example, a one-chip CPU mounted at the front of the vehicle is a 1 signal, a one-chip CPU mounted at the rear is a signal O, and so on. can do.

(Effects of the Invention) As described above, according to the present invention, the signal from the light receiving element is digitally processed and converted into serial data by a one-chip CPU, and connected to external equipment, so only one pair of signal lines is required. , it is also possible to process arbitrary data with a single-chip CPU.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing a case where a laser beam receiving device is mounted on a civil engineering vehicle, Fig. 2 is a schematic external appearance conceptual diagram of the laser beam receiving device of the present invention, and Fig. 3 is a block diagram of signal processing transmitted by a light receiving element. , FIG. 4 is a diagram showing a conventional laser beam receiving device. In the figure, 103 is a laser projector, 104 is a laser beam, 203
206 is a voltage comparator, 207 is a binary converter, and 208 is a one-chip CPU. Applicant: Komatsu Ltd. Agent (patent attorney) Oka 1) Kazuyuki Figure 4

Claims (1)

[Claims] In a laser light receiving device having a plurality of light receiving elements that receive laser light projected from a light projector and convert it into an electrical signal,
The present invention includes a conversion device that converts an electrical signal into a digital signal, a binary converter that converts the digital signal into a binary number, and a one-chip CPU that operates on the signal converted to the binary number and converts it into serial data. Characteristic laser light receiving device.