JPS6224108A - Non-contact distance measuring apparatus - Google Patents

Abstract

PURPOSE:To enable non-contact measurement only with light source bodies and a simple device on the light receiving section side, by arranging two light source bodies, a pair of light receiving sections, a position measuring section and the like. CONSTITUTION:A pair of right and left light source bodies 1 and 3 which emit luminous fluxes 2 and 4 alternately are provided on gears 15 and 16 respectively and because the gears 15 and 16 are meshed together, as one thereof turns, the other thereof does by the same angle in the opposite direction. On the other hand, the left light receiving section 9 has a highly light receiving sensitive directivity on the left side of the intersection 5 while the right light receiving section 10 does on the right side of the intersection 5. Therefore, when the reflecting surface coincides with the intersection 5 at the position 6, the left and right light receiving sections 9 and 10 detect the quantity of light of the same intensity. When the reflecting surface is at the position 7 and 8, that is, a approaches the light source side from the intersection 5 or moves further to the light receiving sections 9 and 10, dfferential signals of the respective light receiving sections 9 and 10 give AC signals synchroniz ing the alternate emissions of the light source bodies 1 and 3, being so provided that both of the signals are in opposite phase. A drive section 13 is driven depending on the differential signals. In this manner, even when the reflecting surface moves, the gears 15 and 16 turn forward or backward following the movement thereof and the angles of rotation of the gears 15 and 16 are detected with a position detecting mechanism 13 thereby enabling the measure ment of the position of the reflecting surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel non-contact distance measuring device that utilizes the reflected light of a pair of intersecting light beams, and the present invention relates to a new non-contact distance measuring device that uses reflected light from a pair of intersecting light beams, and the measuring point is It is used to measure the distance to a measurement object that reflects diffusely.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. In the drawings, (1) and (3) alternately alternate thin and parallel light beams (2) and (4) as shown in FIG. 2 (A). A pair of left and right light source bodies that emit light at
9 are interlocked with each other, so when one rotates, the light beam emitted by the other at the same angle (3) moves from the position (2)'(4)' to the position (2)'(4)'. be able to. In addition, the left light receiving section (9) has a directivity with high light receiving sensitivity on the left side of the intersection (5), and the right light receiving section (11) has a directionality with high light receiving sensitivity on the right side of the intersection (5). Therefore, the reflecting surface is on the left side of the intersection (5). When the position coincides with the intersection point (5), the left and right light receiving sections (9), α, always detect the same intensity of light as shown in (b)K in Fig. 2.Reflection The surface is at (7) position,
In other words, when approaching the light source side from the intersection (5), the luminous flux (2)'
The point (5)' where , (4)' is reflected is the left and right light receiving part (9)
, α1 approaches α1, so when the left light source (1) is emitting light, as shown in (c)K in Figure 2, the detection amount of the left light receiving unit (9) is different from that of the right light source ( 3) is emitting light, the detection amount of the right light receiving part Q1 increases, and as a result, the difference signal between the light receiving part (9) and the wire is the same as that of the light source (1), (3).
This is an AC signal synchronized with the alternating light emission. The reflective surface is (8)
, that is, when it is far from the intersection (5), the reflection point (5)' of the light beams (2)' and (4)' is opposite to the case of the reflective surface (7).
is far away from the light receiving part αQ1 (9), so it is shown in Fig. 2)
The difference signal between the light receiving section (9) and the α signal as shown in the figure (K) becomes a similar alternating current signal, but the phase is opposite to that in the case (c) of FIG. The difference signal between the light receiving section (9) and the α signal is transmitted through the phase discrimination circuit ←υ and the amplification circuit tL2, and rotates the driving section (13). is the intersection (5
), when the gear is closer to the light source (Le is clockwise in Fig. 1, gear σe is in the counterclockwise direction in the same figure, and when Le is closer to the light source), the gear is in the haze state (Le is Each rotates in the opposite direction to the above. In the state (b) of FIG. It is composed of an electric motor and a transmission gear, but of course this can also be done in other ways.In this way, even if the reflecting surface moves up and down, the light source (1)
The gear (l!19) carrying (3) (IQ always follows this and rotates forward and backward, and the direction of the light source (1) and (3) is always kept constant, so the rotation of gear tJ51G If the angle is detected by the position detection mechanism I, the position of the reflective surface can be measured.

The position detecting mechanism I is not limited to a flat resistor as shown in the figure, but may also be any other angle detecting method.

When using the apparatus of the present invention, (1) there is no need to provide any special equipment on the reflective surface (surface to be measured), and non-contact measurement is possible with only simple equipment on the light source and light receiving parts.

(2) Since the electric signal in the present invention is an AC signal,
Width amplification, noise removal, drift prevention, etc. are easily performed, and stable and highly sensitive detection is possible.

(3) During operation, the reflecting surface is always near the intersection of the two light beams, so the optical system obtains a narrow parallel light beam, and the directional characteristics of the light receiving section are determined.
These conditions are simplified, and highly sensitive and stable operation can be easily obtained.

(4) The distance to the reflecting surface can be measured continuously, and as mentioned above (non-contact), which is advantageous in practice.

(5) When continuously measuring the distance to the reflecting surface as described in the previous section, the reflecting surface is always near the intersection (5), so design conditions such as the light source, the optical system of the light receiving section, the directivity characteristics, etc. are advantageous.

It is extremely effective.

[Brief explanation of drawings]

The figures show an embodiment of the non-contact distance measuring device of the present invention, in which Fig. 1 shows the overall configuration, Fig. 2 shows the amount of light emitted from the light source,
FIG. 7 is a time relationship waveform diagram of a light source and a detection signal showing the amount of light detected by the light receiving section and the difference value between the detection signals. (1) (3)...Light source, (2) (4) (2)' (
4)'(2)'(4)'... Luminous flux, (5) (5)
'(5)'...Intersection of luminous flux, (6)...Reflecting surface,
(9) α1... Light receiving section, αυ... Phase discrimination circuit, α
2...Width amplification circuit, a-gen...driver, α4...position detection mechanism, α51(16)...gear.

Claims (1)

[Claims] The line connecting the two light sources is parallel to the surface to be measured, the surface to be measured is at the same distance from each light source, the light beams from the light sources intersect on the surface to be measured, and the light sources are arranged alternately. A pair of photoreceptors that receive the light emitted from each of these light source bodies and reflected on the surface to be measured at the center of both light source bodies and convert it into an electrical signal, and each of the electrical signals. is processed to compare and determine whether the distance between the light source and the reflecting surface is larger or smaller than a preset value, and based on this determination result, the displacement part that changes the pointing direction of the light source and the pointing angle of the light source are detected. A non-contact distance measuring device comprising a position measuring section.