JP2522609Y2 - Light receiving position detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a center position detecting device for scanning and receiving a circular beam light projected from an electronic level device in a direction intersecting a measuring direction and detecting a center position of the circular beam light. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of apparatus, one having a configuration as shown in FIG. 4 has been proposed. In FIG. 4, one end face of the 16 optical fibers 51 to 66 is
The light receiving surfaces are formed linearly, and the other end surfaces of the optical fibers 51 to 66 are connected to the 16 optical branching devices 51A to 51A.
6A, and each of the optical branching devices 51A to 66A.
A splits into an optical path of two lights from A, and one of optical fibers 51b to 54b split by optical splitting devices 51A, 52A, 53A, 54A is connected to light receiving element A. Further, the light receiving element B includes the optical branching devices 55A, 56A, 5A.
One of the optical fibers 55b to 58b branched by 7A and 58A is connected, and the other of the optical fibers 59b to 62b and the optical branching devices 63A to 63B are similarly connected to the light receiving elements C and D by the optical branching devices 59A to 62A.
One optical fiber 63b to 66b branched at 6A is connected.

Further, the light receiving device E includes an optical branching device 5.
The other optical fibers 51a, 55a, 59a, 63a branched by 1A, 55A, 59A, 63A are connected, and the light receiving device F is connected to the optical branching devices 52A, 56A, 60A,
The other optical fibers 52a, 56 branched by 64A
a, 60a and 64a are connected, and the other optical fibers 53a, 57a, 61a and 65a branched by the optical branching devices 53A, 57A, 61A and 65A are connected to the light receiving element G. Further, the light receiving device H includes an optical branching device 54A,
The other optical fibers 54a, 58a, 62a, 66a branched by 58A, 62A, 66A are connected, the respective light receiving elements A to H are connected to the detection circuit 70, and the CPs are further connected.
U71 and the display 72 are connected.

Thus, when the light beam moving in the arrangement direction of the one end faces of the optical fibers 51 to 66 is at an arbitrary position on the optical fibers 51 to 66, the digital information of two series of light receiving elements A to D and E to H is used. The position of the light beam in the optical fibers 51 to 66 can be detected by a small number of light receiving elements and displayed on the display 72.

[0005] That is, for example, if the light beam is located at one end face of the optical fiber 53, the light receiving element A outputs a signal of receiving the light beam, and the light receiving element A is connected to the optical fibers 51 to 54. Therefore, only the output signal of the light receiving element A is used for the optical fibers 51 to 54.
It is not possible to determine which one of the end surfaces has the light beam. Therefore, this determination is made based on the output signal of H from the light receiving element E. That is, the presence of the light beam at the position of the one end face of the optical fiber 53 can be known by the output signals generated from the light receiving elements A and G.

[0006]

As described above, in the prior art, there is a problem that a position below the arrangement pitch of the optical fibers 51 to 61 cannot be read. Further, when the arrangement pitch is reduced, the arrangement and connection of the optical fibers become complicated, and there is a problem that the assembling workability is poor.
The present invention has been made in view of such a conventional problem, and has as its object to provide a high-resolution light-receiving position detecting device in which light-receiving sections are formed at a coarse pitch.

[0007]

In order to achieve the above-mentioned object, a light-receiving position detecting device according to the present invention provides a circular light beam projected from an electronic level device with a diameter of not more than 1/3 of the diameter of the circular light beam. A light receiving unit having a plurality of light receiving units arranged linearly in the measurement direction at a pitch, and a time when the circular light beam crosses each light receiving unit of the light receiving unit based on a signal detected by the plurality of light receiving units. It has a time detecting means for detecting and a calculating means for calculating the center position of the circular light beam based on the time information of the time detecting circuit.

In the first aspect of the present invention, the light receiving means includes a plurality of light receiving elements arranged respectively corresponding to the light receiving sections, and divides signals detected by the plurality of light receiving elements into groups. Signal detecting means for determining whether or not the light beam detected by the light receiving element is within the group based on the result of the addition and outputting the signal, and the calculating means includes: The center position of the circular light beam is calculated based on the output signal of the signal detecting means and the time information.

In another aspect of the present invention, the light receiving means includes a plurality of optical fibers each having one end arranged at a position corresponding to the light receiving section, and a beam light received at one end of each optical fiber. Respectively, the first light receiving element unit that divides one of the branched light beams into groups and detects the light beams by the number of light receiving elements corresponding to the group, and the other of the branched light beams, A second light-receiving element unit that combines different ones of the group and detects them by a corresponding number of light-receiving elements, and according to a signal detected by each light-receiving element of the first light-receiving element unit, Signal detecting means for judging whether or not the light beam received by each optical fiber of the light receiving section is within the group and outputting the signal; Only, the calculating means, based on the time information of the output information and the time detection circuit of the signal detecting means, is characterized in that for calculating the center position of the circular light beam.

[0010]

In the present invention, the center position of the circular light beam can be obtained by calculating a plurality of time information by the time detecting means or the time information and the output information from the signal detecting means. The following high-resolution detection becomes possible. In addition, the pitch of the light receiving sections can be made coarse, so that the assembling workability is improved.

[0011]

1 is a block diagram showing the principle of an embodiment of a light receiving position detecting device according to the present invention. In FIG. 1, light receiving elements 1 to 1 each composed of a photodiode having a small light receiving surface
Numerals 0 are arranged at the same pitch on a straight line in the measurement direction to form a light receiving unit. At this time, the pitch of each of the light receiving elements 1 to 10 is set to be equal to or less than 1/3 of the diameter of the circular light beam that is rotationally projected from the electronic level device at a constant speed (for example, φ20 mm
In this case, the light receiving element pitch is 5 mm. ), The configuration is such that the outputs of three or more light receiving elements can be detected without fail even if this circular light beam enters at an arbitrary position.

One of the light receiving elements 1 to 5 is connected to a first digital circuit 11A as signal detecting means, and the other light receiving element 6 to 10 is connected to a second digital circuit 11B also as signal detecting means. I have. Light receiving elements 1 to 5
Is connected to the time detecting circuit 12, and the light receiving elements 6 to 10 are also connected to the time detecting circuit 12, respectively.
The light receiving elements 2 and 7, the light receiving elements 3 and 8, the light receiving elements 4 and 9, and the light receiving elements 5 and 10 are connected in pairs.

Each of the digital circuits 11A and 11B has an adder, a comparator, and the like, and outputs a detection signal when an addition level of input signals obtained from each of the light receiving elements 1 to 5 and 6 to 10 exceeds a predetermined value. The outputs of the digital circuits 11A and 11B are input to a CPU (Central Processing Unit) 13. Also, the time detection circuit 1
Numeral 2 is configured to detect the time when the circular light beam crosses the light receiving elements 1 to 10, respectively, and is input to the CPU 13. The data processed by the CPU 13 is sent to an external personal computer or printer via the interface 14. The data similarly processed by the CPU 13 is connected to the display 15.

Next, the operation will be described with reference to FIG. FIG. 2 shows the principle of operation of the light receiving element 1.
4 are diameters 2R of the circular light beam 16 as shown in FIG.
Are arranged in a straight line in the measurement direction at a pitch P of 1/3 or less. Considering that the circular light beam 16 shown in FIG. 2 scans from the left side to the right side of the drawing (for convenience, the scanning direction is indicated by an arrow 17), the outputs of the light receiving elements 1, 2, and 3 are digital circuits shown in FIG. The signal is added at 11A and input to the CPU 13 as a detection signal. That is, the digital circuit 11A determines that the added level of the output signals of the light receiving elements 1 to 3 exceeds a predetermined value, and the output becomes, for example, a high level. The predetermined values are light receiving elements 1 to 5, light receiving elements 6-1.
0, which is set to determine which of the groups has the circular light beam. In consideration of identifying that the circular light beam is located at the boundary position between the two groups,
In addition, the level is set to a low level that can be distinguished from the case where there is no circular light beam and has no influence of noise.

In this case, the CPU 13 determines that the group of the light receiving elements 1 to 5 has a circular light beam. Times at which the circular light beam 16 traverses the light receiving elements 1, 2, and 3 are defined as t ₁ , t ₂ , and t ₃ , respectively. These are detected by the time detection circuit 12, and their outputs, t ₁ and t _{2, are obtained.} , T ₃ are input to the CPU 13. The CPU 13 compares each of t ₁ , t ₂ , and t ₃ , determines which light receiving element is closest to the center of the circular light beam, performs further calculations, and performs a circular operation based on information from the digital circuit 11A. Find the beam center position accurately.

Next, the calculation method will be described in detail.
In FIG. 2, it can be seen that the light receiving element 2 has a position input closest to the center of the circular light beam 16. Here, the shift amount from the light receiving element 2 to the center position of the circular light beam 16 is represented by y,
The light receiving element pitch is p, and the circular beam light is
3 are defined as t ₁ , t ₂ , and t ₃ , respectively.
/ 2 is a, b, c, respectively, and the radius of the circular light beam 16 is R. The coordinate points x ₁ , x ₂ , x ₃ on the circumference of the circular light beam 16 are respectively

[0017]

Since p and y are obtained from the relationship,

[0019]

(Equation 1)

[0020]

(Equation 2)

## EQU1 ## Since the solution of the shift amount y here is a unit of time, it must correspond to the actual length. Therefore,

[0022]

(Equation 3)

[0023]

[0024]

(Equation 4)

The following equation is obtained. As a result, a resolution equal to or smaller than the light receiving element pitch can be obtained by calculation. As described above, the CPU 13 performs the arithmetic processing based on the information of the digital circuit 11A and the time detection circuit 12, so that the center position of the circular light beam 16 can be known as the absolute value H from a certain reference point of the apparatus. This absolute value H is displayed on the display 15 shown in FIG.
Digitally displayed by Also, interface 1
4 allows data communication with an external personal computer or the like.

FIG. 3 is a block diagram showing another embodiment of the present invention. In this embodiment, as shown in FIG. 3, a plurality of optical fibers 21 to 30 and one of the light beams branched by the optical fibers 21 to 30 are divided into, for example, two groups and two corresponding light receiving elements 31A. , 31B, and the other light beam split by the optical fibers 21 to 30, respectively.
The light receiving means is constituted by the second light receiving element portions 32, which are different from each other in the group and are respectively detected by the five light receiving elements 33 to 37 corresponding thereto.

The light beam 1 received by each of the optical fibers 21 to 30 according to the signal detected by each of the light receiving elements 31A and 31B of the first light receiving element section 31.
Digital circuits 11C and 11D for judging whether or not 6 is in the group and outputting the signal are provided as signal detection means. Further, the signals obtained from the respective light receiving elements 33 to 37 of the second light receiving element section 32 are used to generate the circular
Are provided with time detecting circuits 12A to 12E for detecting the time when the optical fiber 21 traverses each of the optical fibers 21 to 30.
Output information of 1C and 11D and time detection circuits 12A to 12E
And the center position of the circular beam 16 based on the time information
This is what is required by PU13.

Here, a plurality of optical fibers 21 to 30
Is such that each one end face is one-third of the diameter of the circular light beam 16.
It has a structure in which the light receiving surfaces are formed so as to be arranged in a straight line in the measurement direction at the following pitches, and the light beam received at one end surface thereof is branched. Then, one of the light beams split by the optical fibers 21 to 25 is received by one light receiving element 31A, and the other optical fibers 26 to 3 are received.
One of the light beams branched at 0 is the other light receiving element 3
1B, the outputs of the light receiving elements 31A, 31B are processed by the digital circuits 11A, 11B in the same manner as in the above embodiment, and then input to the CPU 13.

The other light beam split by the optical fibers 21 and 26 is received by the light receiving element 33, and the other light beam split by the optical fibers 22 and 27 is input to the light receiving element 34 and split by the optical fibers 23 and 28. The other light beam thus obtained is received by the light receiving element 35 and the optical fibers 24, 2
The light beam split at 9 is received by the light receiving element 36, and the light beam split at the optical fibers 25 and 30 is received by the light receiving element 37. These light receiving elements 33 to 37
Are received by the time detection circuits 12A to 12A, respectively.
2E, the circular beam light 16 is converted into each optical fiber 2
After being detected as time information that crosses 1 to 30, the CPU
13 is input. As a result, the CPU 13 outputs the outputs of the digital circuits 11A and 11B and the time detection circuit 12A.
The center position of the circular light beam 16 can be accurately obtained in the same manner as in the embodiment of FIG. In FIG. 3, the same or corresponding components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In the above embodiment, the case where the center position of the circular light beam is calculated based on the output information of the digital circuit as the signal detecting means and the time information of the time detecting circuit has been described. However, the present invention is not limited to this. Instead, the center position of the circular light beam can be obtained based on the time information.

[0031]

As described above, according to the present invention, a circular light beam projected from an electronic level device is scanned and received in a direction intersecting the measurement direction, and the center position of the circular light beam is detected. In the center position detecting device, a light receiving means having at least a plurality of light receiving portions linearly arranged in a measurement direction at a pitch of 1/3 or less of the diameter of the circular light beam is detected by the plurality of light receiving portions. By providing time detecting means for detecting the time when the circular light beam traverses each of the light receiving sections by a signal, based on the time information of this time detecting circuit, the center position of the circular light beam is determined as an absolute value from the reference point. You can ask. For this reason,
There is an advantage that the center position of the circular light beam can be detected accurately and with high resolution at a coarse light receiving portion pitch without making the light receiving portion pitch fine in order to increase the resolution.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram showing an embodiment of a light receiving position detecting device according to the present invention.

FIG. 2 is an explanatory view of the operation principle of the embodiment.

FIG. 3 is a block diagram showing another embodiment according to the present invention;

FIG. 4 is a configuration diagram illustrating an example of a conventional device.

[Explanation of symbols]

 1-10 Light receiving element 11A, 11B Digital circuit (signal detecting means) 11C, 11D Digital circuit (signal detecting means) 12 Time detecting circuit 12A-12E Time detecting circuit 13 CPU 14 Interface 15 Display 16 Circular beam light 21-30 Optical fiber 31 first light receiving element section 32 second light receiving element section

Claims (3)

(57) [Scope of request for utility model registration] 1. A light-receiving position detecting device which scans and receives a circular light beam projected from an electronic level device in a direction intersecting a measuring direction and detects a center position of the circular light beam. 1/3 of the diameter of light
A light receiving unit having a plurality of light receiving units linearly arranged in the measurement direction at the following pitch, and the circular light beam is applied to each light receiving unit of the light receiving unit based on a signal detected by the plurality of light receiving units. A light receiving position detecting device comprising: a time detecting means for detecting a crossing time; and a calculating means for calculating a center position of the circular light beam based on time information of the time detecting circuit. 2. The light-receiving means includes a plurality of light-receiving elements respectively arranged corresponding to the light-receiving sections, adds signals detected by the plurality of light-receiving elements into groups, and adds the signals. Signal detecting means for judging whether or not the light beam detected by the light receiving element is within the group based on the signal output means, and outputting the signal. The light receiving position detecting device according to claim 1, wherein a center position of the circular light beam is calculated based on time information. 3. The light receiving means includes: a plurality of optical fibers each having one end arranged at a position corresponding to the light receiving unit; and a beam light received at one end of each optical fiber. A first light receiving element unit that divides one of the divided light beams into groups and detects each of the divided light beams by the number of light receiving elements corresponding to the group; A second light receiving element unit which is combined and detected by a corresponding number of light receiving elements, respectively,
According to a signal detected by each light receiving element of the first light receiving element unit, determine whether the light beam received by each optical fiber of the light receiving unit is in the group,
Signal detecting means for outputting the signal is further provided, and the calculating means calculates a center position of the circular light beam based on output information of the signal detecting means and time information of the time detecting circuit. The light receiving position detecting device according to claim 1.