JPH04113088U - Object passage detection sensor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent destruction of internal elements due to static electricity of pachinko balls in a sensor for detecting pachinko balls. [Structure] Detection element 11 is provided on the surface of printed wiring board 1.
12. Mount the electrical component 3, cover the component mounting side with an insulating front case 4, and connect the ground pattern 31 from the component mounting surface to the back surface of the printed wiring board 1 through the through hole 40.
The back side is covered with a conductive back case 5, and the back case 5 and the ground pattern 31 are brought into contact or close to each other. [Effect] When a pachinko ball carrying static electricity passes through the passage hole, the static electricity is discharged to the conductive back case and is finally grounded through the ground pattern of the printed wiring board.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a sensor that detects the passage of statically charged objects such as pachinko balls. This article relates to an improved structure for static electricity countermeasures.

0002

[Conventional technology]

Conventional magnetic pachinko ball detection sensors are printed layouts as shown in Figures 6 to 8. A magnetic coil 2 and electrical components 3 are mounted on the wire board 1, and these are placed in an insulating case 4. , 5, and the like.

0003 Then, the change in the magnetic field of the magnetic coil when the pachinko ball passes through the passage hole 6 is detected. By doing this, the presence or absence of passing pachinko balls is detected without contact.

0004 In addition, the conventional optical pachinko ball detection sensor uses a transmission type optical coupling device as shown in Figure 9. A light emitting element 11 and a photointerrupter are placed inside the sensor body 10. A light-receiving element 12 that combines a light modulation drive circuit, a light-receiving chip, and a signal processing circuit into one chip. are arranged opposite to each other across the passageway 13 so as to be optically coupled.

[0005] When the pachinko balls pass through the path, the optical path formed on the path is patterned. By blocking the pachinko balls, the passage of pachinko balls is detected without contact.

[0006] The optical pachinko ball detection sensor mentioned above has a U-shaped sensor body. In addition, each lead terminal of the light emitting element and light receiving element is pulled out in a direction perpendicular to the optical path. Because of this, it has become thicker and larger, while it has become thinner and smaller like the magnetic type. I can't.

[0007] Therefore, the applicant has developed an optical pachinko ball detection sensor that is thinner and smaller. In order to achieve this, the prior art shown in FIGS. 10 to 12 is proposed.

[0008] In other words, the optical pachinko ball detection sensor shown in FIGS. A ball passage hole 6 is provided through the sensor body 10, and a light emitting element 11 and a light receiving element 1 are provided. By pulling out each lead terminal of 2 in the direction perpendicular to the passing direction of pachinko balls, the The sensor body has been made thinner.

[0009] Further, the light emitting element 11 and the light receiving element 12 are arranged in parallel, and the optical element is inserted into the passage hole 6. By providing the guide 20 and the prism 21, a light emitting element and a light receiving element can be mounted. The shape of the printed wiring board 1 is simplified, and the sensor body is made smaller.

0010

[Problem that the idea aims to solve]

Generally, pachinko balls pass through the sensor while charged with static electricity, so when they pass through the sensor, The static electricity charged on the pachinko ball is discharged, causing the sensor's electronic components, especially ICs, to accumulate. Destruction of the circuit pattern occurs. Therefore, the parts of FIGS. 6-8 and 10-12 Static electricity countermeasures are taken for the sensor for detecting dick balls.

[0011] Specifically, a conductive plate (such as a copper plate) 30 is connected to the ground pad of the printed wiring board 1. Bend it to turn 31 (minus for 2-wire system) as shown by A in Figure 6 and connect or close it. By making contact, static electricity is dissipated to the ground and grounded.

0012 However, a process such as contacting the conductive plate with the ground pattern was required, so This is a factor that makes the cost relatively high.

[0013] In view of the above, this invention reduces the number of parts and assembles while taking measures against static electricity. Pachinko ball detection that reduces manufacturing costs by reducing the number of stand-up steps and simplifying assembly The purpose is to provide sensors for

[0014]

[Means to solve the problem]

The problem solving means according to claim 1 of the present invention is as shown in FIGS. 1 to 4, The interior of the sensor body 10 is provided with a passage hole 6 through which the object to be detected passes. Detection elements 11 and 12 for detecting whether or not the object to be detected passes, and electrical components. 3 is mounted and stored on the printed wiring board 1, and it is possible to ignore whether or not the object to be detected passes. The sensor body 10 is an object passage detection sensor that detects with a contact point, and the sensor body 10 is an insulated The detection elements 11 and 12, the electrical parts 3 and the print A front case 4 that covers the wiring board 1 and a detection element 1 made of conductive light-shielding resin. 1, 12, a back case 5 for storing and holding electrical components 3 and printed wiring board 1, etc. A through hole 40 is formed in the printed wiring board 1, and the through hole 40 is formed in the printed wiring board 1. The ground pattern 31 of the printed wiring board 1 passes through the hole 40. The wire is routed from the front surface of the board 1 to the back surface and is provided in contact with or close to the back case 5. It is something that was given.

[0015] Further, the problem solving means according to claim 2 is as shown in FIG. The sensor body 10 is provided with a passage hole 6 for passing through the sensor body 10. Detection elements 11 and 12 and electrical components 3 for detecting whether or not an object has passed are printed. It is mounted and housed on the wiring board 1, and non-contact detects whether or not the object to be detected passes. The sensor body 10 has an insulating property. Consisting of light-shielding resin, detection elements 11 and 12, electrical components 3 and printed wiring board 1 a front case 4 that covers the detection elements 11, 12, which are made of conductive light-shielding resin; It is composed of a back case 5 that houses and holds electrical components 3 and a printed wiring board 1. , a through hole 40 is formed in the printed wiring board 1, and a through hole 40 is formed through the through hole 40. An earth pin 50 is provided upright from the back case 5, and a printed wiring board is placed on the earth pin 50. The ground pattern 31 of the wire board 1 is provided so as to be in contact with or in close proximity to each other. Ru.

[0016]

[Effect]

In the above problem solving means, the object to be detected having static electricity passes through the passage hole 6 of the sensor. When the static electricity is discharged to the conductive back case 5, the ground of the printed wiring board 1 is It is finally grounded through the conductor pattern 31, and the internal electrostatic charge of the object to be detected is Prevents element destruction.

[0017]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. In addition, FIGS. 6 to 12 The same reference numerals are given to the same functional parts as those in the conventional art and the prior art shown in .

[0018] <First example> FIG. 1 is a longitudinal cross-sectional side view of a pachinko ball detection sensor according to the first embodiment of the present invention, and FIG. Similarly, FIG. 3 is an enlarged view of part B in FIG. 1, and FIG. 4 is an exploded view.

[0019] As shown in the figure, the optical pachinko ball detection sensor of this embodiment detects the passing of pachinko balls. This is a device that optically detects the presence or absence of a pachinko ball without contact, and allows pachinko balls to pass through. Whether or not pachinko balls pass through the sensor body 10 through which the passage hole 6 is provided. An optical system component C and an electrical component 3 for detecting are mounted on a double-sided printed wiring board 1. This is a measure to prevent damage to internal elements due to static electricity charged on pachinko balls. has been applied.

[0020] The sensor main body 10 is formed in a box shape, and as shown in FIGS. It has an entrance for guiding the light into the sensor body 10, and has an entrance for guiding the light into the sensor body 10, A front case 4 that covers the optical element 11, the light receiving element 12, and the electrical component 3, and the entrance It has an outlet at a corresponding position for allowing the pachinko balls to pass outside the sensor main body 10, The light emitting element 11, the light receiving element 12, the electrical component 3 and the printed wiring board 1 are housed. It is composed of a back case 5 for holding, and the cases 4 and 5 are fitted or It is fixed by oil fixing, crimping, screwing, etc. And the front case 4 is insulating. The back case 5 is made of a light-shielding resin that has conductivity. .

[0021] As shown in FIG. 2, the optical system component C includes a light emitting element 11 that emits irradiation light, and a light emitting element a light receiving element 12 that receives irradiated light from 11 and converts it into an electrical signal; and a light emitting element 11 An optical guide 20 for efficiently guiding the irradiated light from the The irradiation light guided to the passage hole 6 by the optical guide 20 is efficiently transmitted to the light receiving element 12. It is composed of a prism 21 for guiding.

[0022] The light emitting element 11 and the light emitting element 12 are arranged in parallel. And luminescence The element 11 uses a light emitting diode, and each lead terminal is connected to a pachinko ball. It is pulled out in a direction perpendicular to the passing direction and soldered to a predetermined position on the printed wiring board 1. Connected by On the other hand, the light receiving element 12 includes an optical modulation type synchronous drive circuit, a frame The photodiode and signal processing circuit are integrated into one chip, and each lead terminal is Similar to the light emitting element 11, it is pulled out in the direction perpendicular to the passing direction of the pachinko balls. It is connected to a predetermined position on the lint wiring board 1 by soldering.

[0023] The optical guide 20 is made of a translucent resin and has a passage hole 6. an annular portion 20a forming a It is composed of a light guide section 20b.

[0024] The prism 21 is integrally molded with the annular portion 20a of the optical guide 20. and are arranged in phase with respect to the connection point between the annular part 20a and the light guide part 20b. There is. That is, the axis D where the optical axis P connects the connection point and the center of the annular portion 20a is L. They are spaced apart from axis D such that they are spaced apart from each other. This allows optical System component C can continuously detect the presence or absence of passage of pachinko balls.

[0025] As shown in FIG. 3, the printed wiring board 1 has a through hole 40 formed therein. , among the conductor patterns laminated based on the circuit design through the through hole 40. A ground pattern 31 is routed from the front side of the printed wiring board 1 to the back side. is provided so as to be in contact with or close to the base 5.

[0026] Note that the passage hole 6 is provided with optical holes at the entrance of the front case 4 and the exit of the back case 5. The annular portion 20a of the guide 20 is fitted therein.

[0027] In the above configuration, the light emitted from the light emitting element 11 is transmitted to the optical guide 2. 0, the light is guided to the passage hole 6, and further guided by the prism 21 to the light receiving element 12. light is received. When the pachinko balls pass through the passage hole 6, the pachinko balls block the light. Therefore, light does not reach the light receiving element 12. This allows the pachinko balls to pass through the hole 6. Detects that it has passed.

[0028] However, since pachinko balls pass through the sensor while charged with static electricity, When static electricity is discharged to the sensor, it may cause damage to the sensor's electrical components, especially the pattern of integrated circuits such as ICs. This may cause damage to the sensor and malfunction of the sensor.

[0029] Therefore, in this embodiment, in order to prevent this, the sensor body 10 is made of an insulating material. The front case 4 is made of a light-shielding resin that is conductive, and the front case 4 is made of a light-shielding resin that is conductive. The ground pattern 31 of the printed wiring board 1 is From the component mounting surface to the opposite side, that is, from the front side to the back side through the through hole It is brought into contact with or in close proximity to the back case 5 which has electrical conductivity. Here, the proximity means a distance that is at least shorter than the shortest distance from the back case 5 to the conductive part of the electrical component. It means to touch at a distance.

[0030] That is, the distance between the ground pattern 31 and the back case 5 is By making the distance shorter than the shortest distance to the conductive part of the component, pachinko balls with static electricity can be When the sensor passes through the passage hole 6, the static electricity is discharged to the conductive back case 5, and the back case The ground pattern 31 of the printed wiring board 1 does not flow from the ground 5 to the electronic component side. is finally grounded through.

[0031] In addition, since the component mounting surface side is covered with an insulating front case 4, There is no influence on the optical elements 11, 12 and the electrical component 3.

[0032] From the above, the pachinko ball detection sensors shown in Figs. 6 to 8 and 10 to 12 bend the conductive plate and touch or close to the ground pattern of the printed wiring board. No need for contact, no increase in number of parts, no need for extra processes In addition, it is possible to take measures against static electricity, which not only simplifies assembly but also allows for inexpensive installation. Static electricity countermeasures can be taken for the ball detection sensor.

[0033] <Second example> FIG. 5 is an enlarged sectional view of the main parts of the pachinko ball detection sensor according to the second embodiment of the present invention. Ru.

[0034] As shown in the figure, in this embodiment, the printed wiring board 1 is one-sided, and the back side is conductive. A ground pin 50 that passes through the through hole 40 is installed in the case 5, and a ground pin 50 is inserted into the pin 50. The ground pattern 31 of the lint wiring board 1 is in contact with or in close proximity to it. Other configurations, functions, and effects are the same as in the first embodiment.

[0035] It should be noted that the present invention is not limited to the above-mentioned embodiments, but may be modified within the scope of the present invention. Of course, many modifications and changes may be made to the embodiments described.

[0036] In the above embodiment, explanation was given using an optical pachinko ball detection sensor, but the optical system part By replacing the product with a magnetic coil and using the necessary electrical parts, magnetic pachinko balls can be created. It can also be applied to detection sensors.

[0037] In addition, in the second embodiment, the hole in the substrate through which the ground pin passes is electrically connected. Instead of using a through hole that has electrical continuity, a through hole that has no electrical continuity is used instead. It may also be a simple through hole.

[0038] In addition, this invention is a 3-wire system (power supply, output, ground) and a 2-wire system (plus , negative), it can be handled by connecting the ground to the respective ground terminals. Wear.

[0039]

[Effect of the idea]

As is clear from the above explanation, according to claim 1 of the present invention, the printed wiring board Detection elements and electrical components are mounted on the surface, and the component mounting side is made of insulating light-shielding resin. The ground pattern is covered with a front case formed by The back case is routed from the front side to the back side, and the back side is made of conductive light-shielding resin. By covering the test piece with a conductive backing case, it is possible to remove the When the material passes through the passage hole, static electricity is discharged to the conductive back case, and the printed wiring It is finally grounded through the ground pattern of the board, and the static electricity of the object to be detected is It is possible to prevent damage to internal elements due to

[0040] In addition, in claim 2, the through hole of the printed wiring board is provided in the conductive back case. A penetrating ground pin is installed upright, and the ground pattern of the printed wiring board is connected to this pin. are in contact with or in close proximity to each other, so as in claim 1, static electricity of the object to be detected Destruction of internal elements can be prevented.

[0041] Therefore, while taking measures against static electricity, the number of parts and assembly steps can be reduced. It has excellent effects such as reducing manufacturing costs by reducing the amount of heat generated and simplifying assembly. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a sensor for detecting pachinko balls according to a first embodiment of the present invention.

FIG. 2 is also a cross-sectional plan view.

FIG. 3 is an enlarged view of part B in FIG. 1;

FIG. 4 is also an exploded view.

FIG. 5 is an enlarged sectional view of a main part of a pachinko ball detection sensor according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of a conventional magnetic pachinko ball detection sensor.

FIG. 7 is also a cross-sectional plan view.

FIG. 8 is also an exploded view.

FIG. 9 is a sectional view of a conventional optical pachinko ball detection sensor.

FIG. 10 is a longitudinal sectional side view of an optical pachinko ball detection sensor as a prior art.

FIG. 11 is also a cross-sectional plan view.

FIG. 12 is also an exploded view.

[Explanation of symbols]

1 Printed wiring board 3 Electrical parts 4 Front case 5 Back case 6 Passing hole 10 Sensor body 11, 12 Detection element 31 Ground pattern 40 Through hole 50 Earth pin

Claims (2)

[Scope of utility model registration request] 1. A detection element and an electrical component for detecting whether or not the object to be detected passes through is provided in a sensor body, which is provided with a passage hole through which the object to be detected, which is charged with static electricity, passes. A detection object passage detection sensor is mounted and housed on a printed wiring board and detects the presence or absence of passage of the detection object without contact, wherein the sensor body is made of an insulating light-shielding resin and has a detection element. , consists of a front case that covers electrical components and a printed wiring board, and a back case made of conductive light-shielding resin that houses and holds the detection element, electrical components, and printed wiring board, and has a through hole in the printed wiring board. A sensor for detecting passage of an object to be detected, characterized in that a ground pattern of the printed wiring board is routed from the front surface of the printed wiring board to the back surface through the through hole so as to be in contact with or close to the back case. 2. A detection element and an electric component for detecting whether or not the object to be detected passes through the sensor body, which is provided with a passage hole through which the object to be detected charged with static electricity passes. A detection object passage detection sensor is mounted and housed on a printed wiring board and detects the presence or absence of passage of the detection object without contact, wherein the sensor body is made of an insulating light-shielding resin and has a detection element. , consisting of a front case that covers the electrical components and the printed wiring board, and a back case made of conductive light-shielding resin that houses and holds the detection element, the electrical components, and the printed wiring board, and the printed wiring board has a through hole. A sensor for detecting the passage of an object, characterized in that a ground pin is formed and extends through the through hole, and is provided upright from the back case, and a ground pattern of a printed wiring board is provided in contact with or in close proximity to the ground pin.