JPS61274217A - Position-detecting device - Google Patents

Abstract

PURPOSE:To make it possible to detect the specified position at higher accuracy and stability than the remaining position detecting part, by allowing a spot light to displace and only a slit light to pass the specified position containing a detecting range. CONSTITUTION:A beam of light emitted from the source 1 is limited into a slit light by a fixed plate 2 and further, it is limited into a beam of slit light different from spot light or slit light by a moving slitted plate 3, or projected onto a light-receiving surface of a detecting device 4 after transmission as the slit light. On the part excepting both ends of the moving slitted plate 3a, after travelling of the spot light over the light-receiving surface in corespondence with the movement of the travelling slitted plate 3, a position of the plate 3 is detected by a detecting means 5. The slit light is allowed to pass as a beam of slit light in a certain part and in the remaining part, it is limited to the spot light and at the same time, the spot light is given with displacement and by detection by a 1-dimensional type conductor position detector, higher and more stable position detection of the specified position becomes available.

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.

2. Description of the Related Art A potentiometer is known as a device for detecting changes in position or angle. This converts the amount of mechanical change into a change in resistance value, and has the characteristics of a simple structure and a relatively large output. There is a non-contact method used.

Problems to be Solved by the Invention However, with conventional contact potentiometers, the resistance surface is damaged due to sliding between the resistance part and the contact, causing changes in contact resistance, making it impossible to perform stable detection over a long period of time. In addition, non-contact potentiometers using magnetoresistive elements have no sliding noise, but they do have the problem of not being able to perform stable detection when external noise magnetic fields are large. Was.

In view of the above problems, the present invention provides a highly stable position detection device that is free from sliding noise and unaffected by external magnetic fields.

Means for Solving the Problems In order to solve the above problems, the position detection device of the present invention allows a certain part of the slit light to pass through as slit light, and the remaining part is limited to spot light, and the spot light is The device has a complete structure in which the light beams are detected by a one-dimensional position detector.

Effect of the present invention With the above-described configuration, the movement limiting means moves the spotlight and limits the detection range to a certain specific position.
] By passing the slit light, non-contact position detection is achieved, and a specific position is detected with higher accuracy and stability than the remaining position detection parts.

Embodiment Hereinafter, 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 fixed slit plate, and slit light is obtained by both. 3 is a movable slit plate constituting a movement limiting means for restricting the slit light to a spot light and moving this spot light; 4 is a one-dimensional semiconductor position detector (hereinafter referred to as a detector); 5 is a This is a detection means for processing the output signal of this detector 4. FIG. 2 shows a structural diagram of the movable slit plate, and FIG. 3 shows a block diagram of the detection means 5. Second
In the figure, the shape of the moving slit is not only cut diagonally in a straight line, but also the slit light is supplied directly to the detector 4.The operation of the position detection device is shown below. Explain.

First, the light emitted from the light source 1 is limited to slit light by the fixed slit plate 2, and further limited to spot light or slit light different from the slit light by the movable slit plate 3. The light passes through as it is and is projected onto the light receiving surface of the detector 4. Here, when the movable slit plate 3 is the slit plate 2δ shown in FIG. 2a, the slits of the movable slit plate 3a have both ends
When the slits overlap with the slits of the fixed slit plate 2, the slit light that has passed through the fixed slit plate 2 is transmitted through the movable slit plate 3a without being restricted and sent to the detector 4.
The slit plate 3a is cut in a shape and size such that the spot light is projected onto the light receiving surface of the detector 4, and the other portions are cut in the moving direction of the movable slit plate 3a so that the spot light is projected onto the light receiving surface of the detector 4. It is cut in a straight line shape at an angle to the surface. In a portion other than both ends of the movable slit plate 3a, the spot light moves on the light receiving surface of the detector 4 as the movable slit plate 3a moves, and then the position of the movable slit plate 3a is determined by the detection means. Detected by 5.

Next, the configuration and operation of the detection means 5 will be explained.

8.7.8 is an amplifier, 9 is an adder that adds the outputs of amplifiers 6 and 7, 1o is a subtracter that subtracts between the outputs of amplifiers 6 and 7, and jl is the output of adder 9. Subtractor 10
This is a divider that performs division with the output of .

With the above configuration, the two outputs 4a of the detector 4.

4b is calculated, and the position of the spot light on the position detector 4 is output to the position detector A.

At both ends of the movable slit plate 3a, the slit light that has passed through the fixed slit plate 2 reaches the light receiving surface of the detector 4 as it is, but the direction of the slit of the fixed slit plate 2 and the detector 4 are installed so that the direction of the light-receiving surface is the same, the slit light reaches the light-receiving surface in a wider area than the spot light, and the amount of light hitting the light-receiving surface is also the same. increase Here, the detector 4 also has the property of outputting an electrical signal proportional to the amount of light, and can detect not only the position of the spot light but also changes in the scene at the same time, so that the position of the movable slit plate 3a can be detected at the same time. When it reaches both ends,
The detector 4 converts the sudden change in light amount when changing from the spot light to the slit light into an electric signal and sends it to the detection means 5.
By detecting this output as light amount detection B, the detection means 5 can obtain an output in parallel with position detection A, which is an output at each position of the movable slit plate 3a. That is, since position detection A and light amount detection B are obtained at the same time, by constantly looking at both, the positions of both ends of the movable slit plate 3a can be detected separately.

Next, when the movable slit plate 3 is a movable slit plate 3b as shown in FIG. Although the position can be reliably detected by distinguishing it from the detection position of
It goes without saying that it may be provided at several suitable positions within the movement range.

As described above, according to this embodiment, in the position detection device, the light emitted from the light source is converted into slit light, the slit light is passed through a certain part as slit light, and the remaining part is restricted to spot light. At the same time, by moving the spot light and detecting it with a -dimensional semiconductor device detector, the specific part can achieve higher precision than the remaining position detection parts.
Highly stable position detection can be performed.

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

Effects of the Invention As described above, the present invention allows a certain part of the slit light to pass through as a slit light, and the remaining part is restricted to a spot light, and the spot light is moved, thereby producing a one-dimensional conductor position detector. By detecting the position, it is possible to perform highly accurate and highly stable position detection of a specific position without compromising the stability against external noise or the position detection accuracy of conventional position detection devices. It is possible to realize an excellent position detection device that can obtain effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 a, b
are structural explanatory diagrams of a movable slit plate according to an embodiment of the present invention';
FIG. 3 is a block diagram of a detection means according to an embodiment of the present invention. 1...Light source, 2...-Fixed slit plate,
3... Moving slit plate, 4... One-dimensional semiconductor device detector, 5... Operating circuit, 6, 7
．． 8...Amplifier, 9...Adder, 1o
・・・・・・Subtractor, 11・・・・・・Divider. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
' to Gen 6-uke 1 + Tsue Ward d - 綜

Claims (1)

[Claims] a slit light and a movement restriction means that allows a part of the slit light to pass through as a slit light and limits the remaining part to a spot light and moves the spot light; 1. A position detection device comprising: a one-dimensional position detector that detects the amount of light; and a detection means that processes an output signal of the position detector.