JPS60123719A - Slant-angle detecting device - Google Patents

Abstract

PURPOSE:To make the size compact and to perform measurement accurately by consituting a light emitting part so as to face a photoelectric conversion element through a bubble tube. CONSTITUTION:Light is projected from a light emitting diode 1' to a photoelectric conversion element 4, which is divided into four quadrants, through a bubble tube 2 having a bubble 3. The fact that the area of the shade of the bubble 3 in each quadrant is different depending on the inclination is detected by the output difference of the photoelectric conversion element 4 of each quadrant. As the bubble tube 2, e.g., a tube having the diameter of the bottom part of 16mm.phi, the hight of 11mm., and the diameter of the bubble of 5mm. is used. As a liquid, which is to be sealed tightly, a mixed liquid of ethylene alcohol and water at a ratio of 3:1 is used. As the photoelectric conversion element 4, e.g., an SnO2-Si photoelectric-conversion element is used. Thus the device can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic device that can accurately measure tilt angles with a simple configuration.

Currently, devices for measuring the angle of inclination and converting it into an electrical signal include photoelectric devices that measure the position of gyroscopes and pendulums.
Alternatively, a method of measuring using a magneto-electric element or the like is used. Since the former is a complicated device, it is expensive and unsuitable for small-sized devices. In addition, the latter method has disadvantages in that the device is large, it takes time for the pendulum, which is the basis of measurement, to stabilize, and the measurement accuracy is also poor.

Therefore, in the present invention, the position of the bubble in the bubble tube used in a normal spirit level can be determined with high precision using a photoelectric conversion element.
We created a device that makes measurements simple.

The configuration of the present invention is basically to measure the position of a bubble in a level tube using a light emitting section and a light receiving section. This will be explained below with reference to FIG. In FIG. 1, 1 is a light emitting part, 2 is a bubble tube,
3 is a bubble, and 4 is a photoelectric conversion element 5, which is a shadow of the bubble created on the photoelectric conversion element. FIG. 1 shows an example of a vial using a transparent container with spherical inner and outer surfaces in which liquid and bubbles are sealed. If light is shined from the top surface of this bubble tube and the transmitted light illuminates the light receiving part, the shadow of the bubble will not be formed on the light receiving part, and if the position of this shadow is measured, the tilt of the device The angle can now be measured.

Note that although a hemispherical bubble tube is used in this figure, it may be entirely spherical or may be a portion of a sphere.

Alternatively, instead of a bubble, a small spherical object having a specific gravity lower than that of the sealing liquid may be used for sealing. It is also possible to use a dish-shaped container with a spherical concave inner surface, in which a small spherical object is placed in a freely movable state. Furthermore, although FIG. 1 shows a transmissive type, a rectangular shape using a reflective type as shown in FIG. 2 is also possible. In FIG. 2, 1 is a light emitting part, 2 is a bubble tube, 8 is a bubble, 4 is a photoelectric conversion element, and 5 is a shadow of the bubble created on the photoelectric conversion element. In the case shown in FIG. 2, a light spot is formed on the light-receiving surface corresponding to the position of a bubble or the like, so it is only necessary to detect the position.

Next, a configuration for detecting the position of a shadow or a light spot on the light receiving surface will be described. FIG. 8 shows an example in which four equal photoelectric conversion elements are arranged in the shape of a square. In FIG. 8, ▪, ▪, ▪, and ▪ are photoelectric conversion elements divided into equal areas, 5 is the shadow of a bubble, and 6 is a line for separating the photoelectric conversion elements. Now, as shown in Figure 8, number the photoelectric conversion elements, the area of each element is S (this is common), the area of the first shadow is Si, and To is the unit area of the photoelectric conversion element. If the output current is taken as the output current, the output current at the first element is Ti = Ox (S - Si). Therefore, if n is measured, since S is known, Sa can be determined, and thereby the position of the shadow can be determined mathematically. Note that photoconductors such as photodiodes, phototransistors, one-dimensional and two-dimensional arrays thereof, C0D (charge transition device), and CCS (cadmium sulfide) can be used as the photoelectric conversion element in the present invention.

Examples will be described below.

As a bubble tube, bottom diameter 16mm, D, height 11mm1
A cell with a bubble diameter of 5 mm was used. As the sealing liquid, a mixture of ethyl alcohol and water in a ratio of 8:1 was used, and as the light emitting part, G a A 6 light emitting diodes were used. For the light-receiving surface, four 5nO2-8i photoelectric conversion elements with equal characteristics were created by forming a SnQ2 film in the shape of a square on one 81 substrate. FIG. 4 shows an ice-forming S n 0.2 on this light-receiving surface.

Further, FIG. 5 shows the entire tilt angle detection device. Figure 5
, 11 is a light emitting diode, 2 is a bubble tube, the shaded part is a sealed liquid, 8 is a bubble, 4 is a substrate of a photoelectric conversion element, 6 is a line for separation, 7 is a gold electrode, and 8 is a 5nu2
In the experiment, the difference between the output currents of the photoelectric conversion elements (1) and (2), and (2) and (2) was amplified, and the relationship between the voltage converted from this and the slope was measured. Here, the direction of inclination is determined as shown in FIG. The results are shown in FIGS. 7, 8, 9, 10 and 11. In Figures 7 to 11, the symbol (・) indicates the photoelectric conversion element■
This is a diagram for the case of the outputs of and (2), and the vertical axis is the relative output; Figures 7 to 1
1, it was found that there is a nearly linear relationship between the tilt angle and the output in the range of the tilt angle from 0 degrees to about 80 degrees.

Oblique angle is observed. FIG. 12 shows the relationship between the output voltage and the tilt angle in this case. The relationship shown in FIG. 12 holds true for inclinations in both the χ and 1 directions. In FIG. 12, (.) indicates the measured value, and the dotted line indicates the calculated value.

As described above, according to the present invention, the angle of inclination can be measured easily and accurately. According to the inclination angle detection device of the present invention, it is possible to downsize the device. Furthermore, by adjusting the type and viscosity of the liquid in the bubble tube, it became possible to measure with a predetermined time constant even when the angle of inclination changes drastically.

It can be used in a wide range of industrial applications such as one light.

[Brief explanation of drawings]

Figure 1 shows the configuration of the transmission type tilt angle detection device, Figure 2 shows the configuration of the reflective type tilt angle detection device, Figure 3 shows the relationship between the photoelectric conversion element and the shadow of the bubble, Figure 4 shows the photoelectric conversion element, and Figure 5 shows the relationship between the photoelectric conversion element and the bubble shadow. The figure shows the inclination angle detection device, FIG. 6 shows the inclination direction, FIG. 87 shows the detection device when the direction of f in FIG. 6 is tilted upward, and FIG. FIG. 11 is a diagram when the right direction is tilted upward. FIG. 12 shows the relationship between the tilt angle in χ or one direction and the relative output when the tilt direction is divided into two dimensional directions of χ and y. 1...Light emitting part 2...Bubble tube 8...
...Bubble 4...Photoelectric conversion element 5...
...Bubble shadow 6... Separation line of photoelectric conversion element 7... Gold electrode 8... 5nC)+
9...5in2 to... Gold wire 11...
...External lead wire 12-5+13- Yagurami ■, ■
,■,■・・・・・・Photoelectric conversion element 54 Attached materials 1981 Tokai Branch Union Conference of Electrical Related Societies Collection of Lectures P444 and Lecture Schedule Patent Applicant ノに■%
#'! ,'・No II! Figure 1 Figure 3 ↑ Figure 2 Figure 4

Claims (1)

[Scope of Claims] (1) An inclination angle detection device in which a light emitting part is arranged to face a photoelectric conversion element via a vial (2) An inclination angle detection device according to claim 1, in which a vial is directly mounted on the photoelectric conversion element. (3) The tilt angle detection device (4) according to item 1, which is formed by arranging four equal photoelectric conversion elements in a square shape as a light receiving section. Tilt angle detection device according to item 1 (5) comprising a solid-state image sensor or a plurality of photoelectric conversion elements facing each other; Tilt angle detection device comprising a sphere instead of a bubble according to item 1