JPH02201214A - Distance measuring system - Google Patents

Abstract

PURPOSE:To enable the measuring of a distance to an object from a lens or an imaging position of the object precisely by making a parallel light beam with a fixed width irradiate to the object to measure a distance from the object detecting a width of a real image of the reflected light. CONSTITUTION:A parallel light beam with a width AB is made to irradiate an object A at a height (ab) positioned at a point separated by a distance Y from a lens position Q and a real image A' with a height a'b' of an image is formed on an imaging surface K by the reflected light thereof. Then, a width of the real image A' of the reflected light is detected to measure a distance from the object A. The object A may be irradiated with two parallel spot-like lights. In other words, as with alternate irradiation of two parallel light beams these real image A' spots are generated alternately in a light receiving sensor, a distance can be calculated by detecting an interval between the two spots with the sensor. Thus, a correct distance can be measured to the object A from a lens or an imaging position of the object A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides an optical and electrical Regarding the distance method.

"Conventional technology" There are nine representative examples of conventional distance measurement methods that apply the triangular #Jt (Book name: How to use the main parts and points to note, Publisher: Optronics Co., Ltd., Publication date: February 28, 1985) (See pages 109-110 of Japan).

The raw mass will be explained based on FIG. 5.

The source that travels along the fixed optical path 21 from one point P on the object passes through the fixed I/lens 22 and half mirror 23 and is condensed by the eyepiece 24! Tie the rope on Ifi25.

On the other hand, the source that travels along the distance measuring optical path 26 from one point P of the object is reflected by a reflecting mirror 27 that is provided at a distance from the half mirror 23 by the base line length and can be tilted nine times, and passes through the movable lens 28t. It is reflected at right angles by the rear half-I mirror 23 and focused on an image plane 25 by the eyepiece 24 .

Here, the inclination angle of the reflecting mirror 27 and the movable type of the lens 28 are set to [! By doing so, the light passing through the fixed optical path 21 and the light passing through the distance measuring optical path 26 are described together,
As a result, the distance JII'Ik from the S-7ξ mirror 23 or the imaging plane 25 to the point P can be determined.

jlIJchi, /%-7iC23 Distance s from point P
is determined by 8=L/lanα.

"Problem to be Solved by the Invention" However, in the above-mentioned known distance measuring method, in order to focus on the image plane 25, the reflecting mirror 27 is tilted and the fcDs moving lens 28 is moved. There is an unavoidable problem that the mechanism to enable adjustment operations such as l97 is complicated, which requires troublesome operations such as adjusting the engine. There are nine problems that need to be solved.

1. Rounding Means to Solve the Problems of Invention The present invention was made to solve the above-mentioned problem, and was achieved by adding to the Gengaku Raccoon theory.

μU, the invention of claim 1 provides parallel light l1 having a certain width.
illt - irradiate the object's snout and measure the distance to the object by detecting the width of the reflected light.
It is a statue.

Nine, the invention of claim 2 is 21! It is characterized by emitting i parallel spot-shaped ft sources toward an object, and measuring the distance to the object by determining the actual spot width tm of each reflected light. be.

(9) If constructed in a preferred embodiment, the real image formed by the reflected light will be formed on the generatrix of a circular or conical surface.

"Example xa" Hereinafter, the excavation and implementation of the distance measuring method of the present invention will be explained with reference to the drawings. Figure 1 shows that parallel light fjlk of width A is irradiated onto an object of height ab located at a distance of Y from lens position Q. The height is a′v! J! This shows a knot of apex A''.

From lens position 1tQ vs. 5rfI! The distance in JAt is Yl
The distance from the lens position &Q to the actual record A' is y1 object A
The height from ft@ is the height from the original axis of C2) will collect.

ll Y+, -T (1) 5:L (23Y Formula (1), (2) Engineering 9 x = (odor - 1)
CX1X) C4) Equation (3) is the distance 111
It shows the relationship between high school and high school for Y=, and it becomes a quadratic set as shown in Figure 2.

Therefore, if one calculation process is created in advance that satisfies this - number, the distance Yt- from the lens position 1111Q to the object A can be determined by detecting the key height X, that is, the width of the real image. .

Next, equation <4) t, from the lens position 1aIQ to the iron surface K
Until navy blue My and 1#l! It shows the relationship with

Therefore, as shown in the m4 diagram, the change in Y (Ys * Ys
rY1...) at the uniting point, , K, ,
K,... is 1<, @p starting from the lens's proper focus F
゛It can be seen that it is located on M. Therefore, on the straight line FM that satisfies Equation (4), a semiconductor device detection element, such as a flat or glandular PSD (Hamamatsu Photonics Co., Ltd.'s curve We installed a light-receiving sensor such as product name), and the number of reflections detected by the sensor was
t Example, t is i 4 Figure Nioffle FK, , FK
, , FK, %ffi*distance Y from knowing Ic
, I Y, l Y, etc. can be obtained.

In addition, the cow angle l of the apex angle of the cone with FM as the generatrix is β = 90
°-(tan-”\).

In the above, a case has been described in which parallel light having a constant width is irradiated across the object, but it is also possible to irradiate the object with two sets of parallel spot-shaped lights.

That is, when two sets of parallel source beams are alternately irradiated, those *-feed spots are generated alternately on the source center, so the distance between these two spots can be detected by a sensor, and the distance #t is greater than rC. -I can do it.

According to the present invention, for example, X = 1 w, f =
5 txm, as shown in Figure 2, Y26~15
Distance measurement with good sensitivity is possible within the range of FJl. Of course, Y
o To change the range, f-? It is necessary to change the value of X.

``Effects of the Invention'' As mentioned above, the 611J distance method according to the present invention is included in the claims as ``2'C'', so although it is a simple method, it is possible to obtain accurate distances. This has the effect of making it possible to perform measurements.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a graph showing the relationship between the braided fibers Y to be measured and the sudaku height
A graph showing the relationship of distance decay y from the lens to the focal point. Figure 4 is a diagram explaining the principle of the present invention, similar to Figure 1. Figure @5 is a diagram explaining the principle of a typical example of the conventional distance measurement method. be. A...Object, A'...*gz X...Height of the object from the original axis, Position, Y + Yt * YB a
YB... vs. Ji from the lens position! Distance at snout l,
y... Distance from the lens position to the real part, K... Termination surface, Kl e Km 1 Km...lIi! Sudoten, F
... Unique focal point, f... Focal length, E-port... Parallel ft with a certain width, 11M or two sets of parallel subops. Figure f...focal length - xhm) Y habitus)

Claims (1)

[Claims] 1. Irradiating parallel light beams with a certain width toward an object,
A distance measurement method that measures the distance to an object by detecting the width of the real image of the reflected light. 2. Distance measurement characterized by irradiating two sets of parallel spot-shaped light beams toward an object and measuring the distance to the object by detecting the width between the real image spot points of each reflected light. method. 3. The distance measuring method according to claim 1 or 2, wherein the real image is formed on a conical surface or a generatrix of the conical surface.