JPS623604A - Position detector - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a detection device for detecting changes in position or angle.

BACKGROUND OF THE INVENTION As a conventional device for detecting changes in position or angle, we have already proposed a method in which a spot light obtained from a light source with original limitations is projected onto a one-dimensional semiconductor device detector (hereinafter referred to as a detector). There is one that emits light.

An example of the above-mentioned conventional position or angle change detection device will be described below with reference to the drawings.

Figures 3 and 4 show the configuration of a conventional position detection device, respectively.
1 shows a block diagram of an operating circuit of a conventional position detection device. In Figures 3 and 4, 11 is a light source, 12 is a fixed slit plate, 13 is a movable slit plate, 14 is a detector, 15 is an operating circuit, 16, 17, 18 is an amplifier, 19 is an adder, and 20
is a subtracter, and 21 is a divider.

The operation of the position detection device configured as described above will be described below.

First, the light emitted from the light source 11 is transmitted to the fixed slit plate 1.
2 and the movable slit plate 13, the light is restricted to a spot light, and is projected onto the light receiving surface of the detector 14 placed in the same direction as the slits of the fixed slit plate 12. As the movable slit plate 13 moves, the spot light moves on the light receiving surface of the detector 14. The detector 14 outputs a continuous electric signal according to the position of the spotlight moving linearly, and outputs the position of the spotlight projected onto the light receiving surface as an electric signal to the operation circuit 1. The spot light moves by B on the light receiving surface of the detector 14 while the movable slit plate 13 moves by A. Therefore, by detecting the position of the spot light on the light receiving surface, the movement can be determined by detecting the position of the spot light on the light receiving surface. The position of the slit plate 13 can be detected. The operation circuit 15 includes the detector 1
By calculating the ratio of the sum and difference of the four outputs, the position of the spot light is output.

The conventional example having the above-described configuration and operation provides a position detection device having excellent characteristics of high stability without sliding noise and being unaffected by external magnetic fields.

Problems to be Solved by the Invention However, in the above configuration, spot light is obtained without using a lens system, so in order to improve the S/N ratio and perform more accurate position detection, it is necessary to Since a light source with a high amount of light must be used, problems such as high cost and poor compactness arise. Further, when the lens system is installed between the fixed slit plate and the light source or between the movable slit plate and the one-dimensional semiconductor device detector, there are also problems such as poor compactness.

In view of the above-mentioned problems, the present invention provides a position detecting device that is more accurate, inexpensive, and compact without impairing the stability of conventional position detecting devices against external noise.

Means to resolve the problem In order to solve the above problem, the position detection device of the present invention has the following steps:
This device has a configuration in which light emitted from a light source is imaged in a one-dimensional direction, and the formed image is moved and detected by a -dimensional type semiconductor device detector.

According to the above-described configuration, the present invention forms an image of light from a light source on a one-dimensional semiconductor device detector using a moving imaging means, thereby enabling highly accurate position detection to be performed as an inexpensive and compact device compared to the conventional method. This can be achieved.

Embodiment Below, a position detection device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of a position detection device according to the present invention. In FIG. 1, 1 is a light source, 2 is a movable image forming plate, and the movable image forming plate 2 further includes an oblique part 2.
a and a silicate/trical lens part 2b. The oblique part 2a and the cylindrical lens part 2b are made integrally, for example, as a molded product of transparent resin, and then the light source 1 is placed only on the oblique part 2a.
An anti-light coating is applied to prevent light from passing through. Reference numeral 3 denotes one-dimensional semiconductor device detectors (hereinafter referred to as detectors), each of which is arranged so that the light emitted from the light source 1 is imaged on the light-receiving surface of the detector 3 by the cylindrical lens section 2b. has been done. Further, the detector 3 is arranged perpendicularly to the moving direction of the movable imaging plate 2, and the cylindrical lens portion 2b is
The axial direction is inclined by θ with respect to the moving direction of the movable imaging plate 2. Reference numeral 4 denotes an operating circuit, and a block diagram of the operating circuit 4 is shown in FIG.

The operation of the position detecting device configured as described above will be described below with reference to Figures 1 and 2 of the cylinders.

First, the light emitted from the light source 1 passes through the cylindrical lens portion 2b on the image forming plate 2 and is focused on the light receiving surface of the detector 3 as a slit light image that is focused only in one dimension. . As the movable image forming plate 2 moves, the slit light image moves on the light receiving surface of the detector 3. The detector 3 outputs a continuous electric signal according to the position of the linearly moving slit light image, and uses the position of the slit light image formed on the light receiving surface as an electric signal to send to the operation circuit 4.
Output to. The slit light image moves on the light receiving surface of the detector 3 by C and A while the movable image forming plate 2 moves by A.
, -0 (C is a proportionality constant), the position of the movable image forming plate 2 can be detected by detecting the position of the slit light image on the light receiving surface. The configuration and operation of the operating circuit 4 are the same as those of the conventional example, so a description thereof will be omitted.

As described above, according to this embodiment, in the position detection device, the light from the light source is converted into a slit optical image focused in a one-dimensional direction using a cylindrical lens on the light-receiving surface of the one-dimensional semiconductor device detector. By forming an image, it is possible to project an image on the light-receiving surface of the position detector with a light amount density of 7jX higher than that of the conventional method, and the structure of the position detection device is simple, and a movable imaging plate can be obtained at low cost. , highly accurate position detection can be realized as an inexpensive and compact device.

In the embodiment, only a linear movement type position detection device has been described, but it goes without saying that the present invention may be used for a rotational movement type position detection device.

Effects of the Invention As described above, the present invention forms an image of light emitted from a light source in a one-dimensional direction, moves the formed image, and detects it with a one-dimensional semiconductor device detector. It is possible to realize an excellent position detection device that can achieve the effect that more accurate position detection can be performed with an inexpensive and compact device without impairing the stability of the detection device against external noise. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a position detection device as an embodiment of the present invention, FIG. 2 is a block diagram of an operating circuit in the same embodiment,
FIG. 3 is a block diagram of a position detection device as a conventional example, and FIG. 4 is a block diagram of an operating circuit as a conventional example. 1.11... Light source, 2... Moving image plate,
3,14...One-dimensional semiconductor device detector, 4,
15...Operating circuit, 5, 6, 7, 16, 17.
18...Amplifier, 8.19...Adder, 9
, 20... Subtractor, 10.21... Divider, 12... Fixed slit plate, 13... Moving slit plate.

Claims (1)

[Claims] a light source, a movable imaging means for forming an image of the light emitted from the light source in a one-dimensional direction and moving the formed image, a one-dimensional semiconductor device detector for detecting the position of the image; 1. A position detection device comprising: detection means for processing an output signal of a position detector.