JPH04123404U - Mechanism for stopping moving objects using light - Google Patents

Abstract

(57) [Summary] [Purpose] To accurately stop a moving body 1 even if the amount of light emitted from a light emitting element 2 varies or even if the light emitting surface of the light emitting element 2 is tilted. [Structure] A light emitting element 2 that has a wide directional characteristic and indicates the stop position of the moving object 1 by emitting light; a shielding plate 4 that is attached to the light emitting surface of the light emitting element 2 and has a slit 3; A shielding plate 7 is attached to the light-receiving surface of the light-receiving element 5 and has a pinhole 6 formed therein. When the emitted light is received by the light receiving element 5 through the pinhole 6, the moving body 1 is stopped.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea allows the light-emitting surface of the light-emitting element to be tilted even if the amount of light emitted by the light-emitting element varies. However, it is about a stopping mechanism of a moving object using light to stop the moving object with precision. be.

0002

[Conventional technology]

Next, the configuration of a conventional movable body stopping mechanism will be described with reference to FIG. 2. Figure 2A 1 is a moving body, 8 is a light emitting element, and 9 is a light receiving element. The light emitting element 8 It notifies you of the stop position by emitting light. The light receiving element 8 is attached to the moving body 1 and is The light emitted from the light emitting element 8 is received by the movement. The light emitting element 8 has a directional characteristic as shown in Figure 2A. A narrow LED with a narrow directional characteristic is used for the light receiving element 9, as shown in Figure 2C. Phototransistors and the like are used.

0003 Next, the operation of FIG. 2 will be explained with reference to FIG. 3. Figure 3A is a diagram of the state of moving object 1 before it moves. , FIG. 3A is a diagram of the moving body 1 moving and in front of the light emitting element 8, and FIG. 3C is a state diagram of the moving body 1. is a state diagram in which the light emitting element 8 passes in front of the light emitting element 8. 21 is the light receiving element in Figure 3A and Figure 3C 9 is the light receiving voltage when the light emitted from the light emitting element 8 is not received, and 22 is the light receiving voltage of the light receiving element. 9 is the light receiving voltage when the light emitted from the light emitting element 8 is being received at its maximum. Light receiving voltage 2 1 becomes the light receiving voltage 22 at the stop position and stops the moving body 1.

0004

[Problem that the idea aims to solve]

Next, the relationship between the amount of light emitted by the light emitting element 8 and the amount of light received by the light receiving element 9 will be explained with reference to FIG. . Figures 4A and 4B show variations in the amount of light emitted, and Figure 4A shows a case where the amount of light emitted is small. However, the amount of light emitted in Figure 4A is large. Figure 4C shows light reception by the light receiving element 9 according to Figures 4A and 4B. The solid line shows the state in Figure 4A, and the dotted line shows the state in Figure 4I. This is the state when . Figure 4D shows the state of the light receiving element 9 when the light emitting surface of the light emitting element 8 is tilted. This shows the state of the amount of light received.

[0005] Next, the change in the light receiving voltage 22 shown in FIG. 4 will be explained with reference to FIG. Figure 5 shows a light emitting element 8 and the light receiving element 9 have narrow directional characteristics and the light emission of the light emitting element 8 is tilted. 2 is a state diagram of FIG. As the amount of light emitted increases as shown in Figure 4A, the width of the light receiving voltage 22 increases. If the light emitting element 8 becomes wider as shown by the line and the light emitting surface of the light emitting element 8 is tilted as shown in Fig. 4D, As shown by the one-dot chain line in FIG. 5, the position of the maximum light-receiving voltage 22 of the light-receiving element 9 shifts. . If the width of the light receiving voltage 22 becomes wider or the position of the maximum light receiving voltage 22 shifts, the movement may occur. The positioning accuracy for stopping the body 1 deteriorates.

[0006] This idea uses a light-emitting element and a light-receiving element with wide directional characteristics. Attach the first shielding plate with a slit, and the photodetector has a pinhole. By attaching a second shielding plate that is eclipsed, the amount of light emitted by the light emitting elements will vary. Also, even if the light emitting surface of the light emitting element is tilted, the light that stops the moving object 1 accurately can be used. The purpose is to provide a stopping mechanism for moving objects.

[0007]

[Means to solve the problem]

In order to achieve this purpose, this invention has a wide directional characteristic and a stop position of the moving object 1. A light-emitting element 2 that indicates the position of the light-emitting element 2 by emitting light, and a slit attached to the light-emitting surface of the light-emitting element 2. The shielding plate 4 has a wide directional characteristic, is attached to the moving body 1, and emits light. A light-receiving element 5 that receives the light emitted from the element 2, and a light-receiving element 5 that is attached to the light-receiving surface of the light-receiving element 5 and a pin. A shielding plate 7 in which a hole 6 is made is provided, and the light emitting element 2 passing through the slit 3 is When the emitted light is received by the light receiving element 5 through the pinhole 6, the moving body 1 is stopped. .

[0008] Next, the structure of the stopping mechanism for a movable body according to this invention will be explained with reference to FIG. Figure 1 2 is a light emitting element, 3 is a slit, 4 is a shielding plate, 5 is a light receiving element, 6 is a pinhole, 7 is a shielding plate. For example, the light emitting element 2 is a G with wide directional characteristics manufactured by Sharp Corporation. L513F is used, and the light receiving element 5 has a wide directional characteristic manufactured by Sharp Corporation. Use the new PT550F. A slit 3 is made in the shielding plate 4, and a slit 3 is made in the shielding plate 7. A pinhole 6 is made. For example, make the width of slit 3 about 1 mm and use a pinhole. Set the diameter of 6 to about 0.3 mm. The shielding plate 4 is attached to the light emitting surface of the light emitting element 2, The shielding plate 7 is attached to the light receiving surface of the light receiving element 5. When moving object 1 moves, it emits light The light emitted from the element 2 passes through the slit 3 and the pinhole 3 and is received by the light receiving element 5.

[Effect]

[0009] FIG. 6 is an explanatory diagram of the relationship between the light emitting element 2 and the light receiving element 5 in FIG. 1. Light emitting element 2 The light range is limited by the slit 3, and the light receiving range of the light receiving element 5 is limited by the pinhole 6. limited. FIG. 7 is a diagram of changes in light receiving voltage due to variations in the amount of light emitted from the light emitting element 2. It is. The amount of light emitted from the light emitting element 2 is smaller in FIG. 7A than in FIG. 7B. The reception of the light receiving element 5 Regarding the photovoltage, the solid line in FIG. 7C corresponds to FIG. 7A, and the dotted line in FIG. 7C corresponds to FIG. 7A. figure 7C-11 is the light receiving voltage when the light receiving element 5 is not receiving the light emitted from the light emitting element 2. 12 is the photodetection voltage when the photodetector 5 is receiving the maximum amount of light emitted from the light emitting element 2. It's pressure. The light receiving voltage 11 becomes the light receiving voltage 12 at the stop position, and the moving body 1 is stopped. let

0010 Next, the relationship between the inclination of the light emitting element 2 and the light receiving voltage of the light receiving element 5 will be explained with reference to FIG. . Figure 8A shows the state when there is no tilt, and Figure 8B shows the state when there is tilt. . Regarding the light receiving voltage of the light receiving element 5, the solid line in FIG. 8C corresponds to FIG. 8A, and the dotted line in FIG. 8C corresponds to FIG. Corresponds to A. When the light emitting element 2 has a slope, the light receiving voltage 12 of the light receiving element 5 has a slope. It will be less than if it were not there.

[0011] Even if the amount of light emitted by the light-emitting element 2 varies as shown in Figure 7C, the light-emitting element 2 as shown in Figure 8B Even if the light emitting surface of the light emitting element 2 is tilted, the light emission of the light emitting element 2 is limited by the slit 3 and the pinhole 6. Therefore, the change in the light receiving voltage 12 of the light receiving element 5 due to the movement of the moving object 1 is caused by the same phase change. It becomes a change. In other words, the width of the light receiving voltage 12 does not become as wide as shown in FIG.

0012

[Effect of the idea]

According to this idea, a shielding plate with slits is attached to the light emitting element to receive light. A shielding plate with pinholes is attached to the element, and a light emitting element with a wide directional characteristic and a receiver are attached. Since it uses optical elements, even if the amount of light emitted by the light emitting elements varies, the light emitted by the light emitting elements Even if the surface is tilted, the width of the light-receiving voltage of the light-receiving element is narrow, and the change in the light-receiving voltage of the light-receiving element is the same. This results in a change in phase. The maximum value of the light-receiving voltage of the light-receiving element is always given at the same position. Therefore, the moving body can be stopped with high accuracy.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a stopping mechanism for a moving body according to this invention.

FIG. 2 is a configuration diagram of a stopping mechanism for a movable body according to the prior art.

FIG. 3 is an explanatory diagram of the operation of FIG. 2;

4 is an explanatory diagram of the relationship between the amount of light emitted by the light emitting element 8 and the amount of light received by the light receiving element 9 in FIG. 3. FIG.

FIG. 5 is a diagram of changes in the light receiving voltage 22 according to FIG. 4;

6 is an explanatory diagram of the relationship between the light emitting element 2 and the light receiving element 5 in FIG. 1. FIG.

FIG. 7 is a diagram showing changes in light receiving voltage due to variations in the amount of light emitted from the light emitting element 2. FIG.

FIG. 8 is a diagram showing changes in light receiving voltage depending on whether or not the light emitting element 2 is tilted.

[Explanation of symbols]

1 Mobile object 2 Light emitting element 3 slit 4 Shielding plate 5 Light receiving element 6 Pinhole 7 Shielding plate

Claims (1)

[Scope of utility model registration request] [Claim 1] A light-emitting element (2) that has a wide directional characteristic and indicates the stop position of the moving body (1) by emitting light, and a first light-emitting element (2) that is attached to the light-emitting surface of the light-emitting element (2) and that has a slit (3). a shielding plate (4), a light-receiving element (5) that has a wide directional characteristic and is attached to the moving object (1) and receives the light emitted from the light-emitting element (2), and a light-receiving element (5) that is attached to the light-receiving surface of the light-receiving element (5). , and a second shielding plate (7) in which a pinhole (6) is formed, so that the light emitted from the light emitting element (2) passing through the slit (3) is received by the light receiving element (5) through the pinhole (6). The moving object stopping mechanism uses light to stop the moving object (1).