JP2004279389A - Light storage type movement and rotation detecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement and rotation detecting method allowing detection of a plurality of moving directions of a detected part in simple construction without giving wear thereto. <P>SOLUTION: In the light storage type movement and rotation detecting method, a light storage layer 1 using a light storing function material is provided on the surface of a detected object 2 and an illumination device 3 spot illuminates the surface with a light. Thus, a light emitting portion is partially produced in the light storage layer 1. The movement and direction of the light emitting portion can be detected by light receiving elements 4 arranged side by side around the illumination device 3. Thus, the movement and rotation of the detected object 2 is detected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a luminous movement and rotation detecting method using a luminous functional material.
[0002]
[Prior art]
Conventionally, as a means for detecting the movement of a movement detection target, a method of providing a stripe pattern having a different reflectance on the surface of the detection target and irradiating light thereon to read a change in light reflection, or a method of detecting a change in the detection target There is a method in which a sliding contact pattern is provided on the surface of the device, and the sliding contact is brought into contact with the device to read ON / OFF changes in electrical conduction.
[0003]
[Problems to be solved by the invention]
These have the following disadvantages.
In the method of reading the reflection of light by irradiating the stripe pattern with light, it was possible to detect only movement in two directions perpendicular to the stripe pattern.
In the method of contacting the detection device, the detection direction is limited, and the sliding portion is worn, so that it is difficult to extend the life.
The present invention has been made to eliminate these disadvantages.
[0004]
[Means for Solving the Problems]
In order to detect the movement or rotation of the detection target (2), a light storage layer (1) using a light storage function material is provided on the surface of the detection target (2), and the illumination device (3) is used on this surface. By irradiating a spot with light, a light-emitting portion is partially generated in the light storage layer (1), and the movement and the direction of the light-emitting portion are aligned with the light-receiving element (4) arranged around the illumination device (3). ) To detect the movement or rotation of the detection target (2), thereby devising a luminous movement and rotation detection method.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
First, since the present invention detects the movement by utilizing the light emission of the luminous material, the detection target must be placed in a relatively dark place.
Therefore, when using the present invention, a member that is installed in a dark place, is used only for use at night or the like, or covers a movement detection target so that external light does not hit, and blocks external light It is premised to provide.
[0006]
A luminous layer (1) is provided on the surface of a solid detection target (2) whose movement or rotation is to be detected.
The light-storing layer (1) is a layer composed of a light-storing function material, and is formed by laminating layers of a molding material containing a light-storing function agent, painting or printing a light-storing function pigment, or attaching a light-storing function film. And the like.
The composition and the like of the material having a light storage function are not described in the scope of the present invention but are described in detail in each invention.
The light storage function material used in this application preferably has a short light storage time (for example, several seconds), but the light emission luminance must have a level that can be sufficiently detected by the light receiving element (4).
Further, since the light storage layer (1) needs to have a uniform light storage ability as much as possible, the thickness of the light storage layer (1) in the detection range of the light receiving element (4) must be as uniform as possible.
However, this does not apply to the case where the light storage layer is partially eliminated in order to intentionally extract ON / OFF signals, or the masking range.
The surface provided with the luminous layer (1) is not limited to a flat surface.
The surface may be convex as shown in FIG. 3 or concave as shown in FIG.
Further, the present invention can be applied not only to a flat surface and a curved surface but also to a spherical surface.
[0007]
An illumination device (3) and a light receiving element (4) are provided close to the surface of the luminous layer (1) on the fixed side that does not move with the detection target (2).
FIGS. 1 to 4 show a case where a violet (or ultraviolet) light emitting diode is used for the illumination device (3) and a CdS element is used for the light receiving element (4).
The term “fixed side” as used herein means a relative meaning with respect to the detection target (2), so that the detection target (2) is fixed when viewed from the outside, and the illumination device (3) ) And the side on which the light receiving element (4) is mounted may move, but for convenience, the side on which the lighting device (3) and the light receiving element (4) are provided will be referred to as the fixed side.
The illuminating device (3) has a function of irradiating light for causing the luminous layer (1) to emit light. Therefore, this light is not limited to visible light.
A light source that emits visible light, ultraviolet light, or both is used.
Since this light must not directly enter the light receiving element (4) installed adjacently, the light is not diffuse illumination light but spot illumination light, and the illumination device (3) has directivity and light shielding means (5) for this purpose. ).
Further, the light source of the lighting device (3) has an illuminance enough to cause the light storage layer (1) to emit light sufficiently.
The light shielding means (5) may be separate from the light source, or may be a part of the light source. Although the light-shielding means (5) is shown as a light-shielding hood provided in each of the lighting device (3) and the light receiving element (4) in FIGS. 1 to 4, the direct light of the lighting device (3) is received by the light receiving element (4). The light shielding means (5) may be provided in only one of them, and the light shielding means (5) is formed in such a shape as to partition between the illumination device (3) and the light receiving element (4). ) May be provided.
Further, when the directivity of the illumination device (3) is sufficiently sharp, or when the distance between the illumination device (3) and the light receiving element (4) is sufficiently long, the light shielding means (5) may be omitted.
[0008]
Regarding the mutual position of the illumination device (3) and the light receiving element (4), first, the illumination device (3) is arranged on the upper side with respect to the direction in which the detection target (1) moves, and the lower side of the illumination device (3). The light receiving elements (4) are arranged side by side.
The distance between the lighting device (3) and the light receiving element (4) is determined so that the direct light emitted from the lighting device (3) and the light emitted from the light storage layer (1) immediately below the lighting device (3) do not directly enter the light receiving element. And set.
The number of light receiving elements (4) to be used is the same as the moving direction or the rotating direction to be detected.
In contrast, there is only one lighting device (3).
Therefore, when it is desired to detect movement or rotation in two or more directions, the light receiving element (4) is arranged so as to surround the illumination device (3).
[0009]
For example, when it is desired to detect movement or rotation in two left and right directions, two light receiving elements (4a, 4b) are arranged side by side with the lighting device (3) interposed therebetween as shown in FIG.
In this case, when the detection target (2) moves to the right, the light emitting portion (6) remaining in the luminous layer (1) flows to the right as shown in FIG. The element (4b) detects this, and it is possible to determine that the detection target has moved to the right.
[0010]
For example, when it is desired to detect movements in four directions, up and down (or front and back) and left and right, four light receiving elements (4c, 4d, 4e and 4f) are arranged side by side around a lighting device (3) as shown in FIG. .
In this case, when the detection target (2) moves downward, as shown in FIG. 8, the light-emitting portion (6) remaining in the luminous layer (1) flows downward, so that the light-receiving portion disposed below the illumination device (3) The element (4e) detects this, and it is possible to determine that the detection target has moved downward.
[0011]
For example, when the detection target (2) is a disk having a rotation axis (7), as shown in FIG. 9, two light receiving elements ( 4g, 4h).
In this case, when the detection target (2) rotates to the right, the light emitting portion (6) remaining in the luminous layer (1) flows in an arc to the right as shown in FIG. The light receiving element (4h) arranged on the same rotation arc detects this, and it is possible to determine that the detection target has rotated to the right.
[0012]
When a plurality of light receiving elements (4) are used, the distances from the surface of the luminous layer (1) must be substantially the same in order to make these sensitivities uniform.
This is true not only when the surface of the luminous layer (1) is flat, but also when the surface is convex, concave, or spherical.
[0012]
When only the movement in one direction is detected as shown in FIG. 1, the presence or absence of the movement is determined only from whether or not the light receiving element (4) has detected the light emitted from the light storage layer (1) by a certain value or more.
In the case of detecting movement in two or more directions as shown in FIG. 2, the object to be detected may reciprocate. Therefore, comparing the detection value of each light receiving element (4) with an absolute value alone will not change the movement direction. Cannot be determined.
For this reason, the detected value of each light receiving element (4) is determined by using a comparator circuit or software to determine the maximum value among the detected values of each light receiving element (4) in the moving direction or It is determined that the light receiving element is located in the rotation direction.
FIG. 11 shows a flowchart of this.
[0013]
【The invention's effect】
According to the present invention, it has become possible to detect the movement or rotation of a detection target object with a relatively simple structure without causing abrasion on a detection component.
Further, it has become possible to detect a plurality of moving directions.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the present invention (when a movement or rotation detection direction is one direction).
FIG. 2 is a cross-sectional view of the present invention (when the movement or rotation detection direction is two or more directions).
FIG. 3 is a cross-sectional view of the present invention (when a detection target is a convex surface).
FIG. 4 is a cross-sectional view of the present invention (when the detection target is a concave surface).
FIG. 5 is a layout diagram when the movement detection direction is two directions left and right. FIG. 6 is a state diagram when the detection target moves rightward. FIG. 7 is a layout diagram when the movement detection direction is four directions front, rear, left and right. FIG. 8 is a state diagram when the detection target moves downward. FIG. 9 is a layout diagram when the detection target is a rotating body. FIG. 10 is a state diagram when the detection target rotates. 5 is an example of a flowchart for judging the arrangement shown in FIG.
(1) Luminescent layer (2) Object to be detected (3) Illumination device (4, 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h) Light receiving element (5) Light shielding means (6) Luminescent layer light emitting section ( 7) Rotary axis

Claims (6)

A light-storing layer (1) made of a light-storing material is provided on the surface of a solid detection target (2) for detecting movement or rotation, and a light-storing layer (1) is provided on a fixed side that does not move with the detection target (2). The illumination device (3) and the light receiving element (4) for irradiating the spot with light are arranged in the order of the illumination device (3) on the upper side and the light receiving element (4) on the lower side along the moving direction of the detection target (2). They are arranged side by side, are provided close to the surface of the luminous layer (1), and when the detection target (2) moves in the direction from the lighting device (3) to the light receiving element (4), the light is partially emitted by the illumination. A light-storing type movement and rotation detecting method, wherein the light-receiving element (4) detects light emitted from the light-storing layer (1) at a predetermined level or more to determine that the detection target (2) has moved. The number of the light receiving elements (4) is equal to the number of movements or rotations to be detected, and a plurality of light receiving elements are arranged so as to sandwich or surround the illumination device (3) around one illumination device (3). Elements (4) are arranged, and these light receiving elements (4) are placed at substantially the same distance from the surface of the light storage layer (1), and at the same time, these light receiving elements (4) are placed at the same distance from the lighting device (3). The method for detecting the movement and rotation of a luminous type according to claim 1, wherein: The output intensity of the plurality of light receiving elements (4) according to claim 2 is compared, and the detection target (2) moves or rotates in a direction in which the light receiving element (4) having the maximum light amount and a certain value or more is located. The method according to claim 1, wherein it is determined that the movement is performed. 2. The method according to claim 1, wherein the light emitted from the lighting device is visible light, ultraviolet light, or both. 2. A method according to claim 1, wherein said light-storing layer has a uniform thickness in a detection range. 2. The method according to claim 1, wherein the direct light of the illuminating device is not incident on the light receiving element.

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