JP2014089938A - Inclination sensor switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve problems that, although the conventional art has such a structure that a pendulum provided with a magnet part in a casing is installed in the casing swingably via a swinging axis, and a printed board comprising a magnetic sensor in the casing is installed, and a predetermined signal is outputted depending on presence or absence of magnetism of the magnet part that the magnetic sensor receives depending on a swinging angle of the pendulum, a range of an installation position is limited and it is difficult to deal with all directions because of usage of a magnet.SOLUTION: An inclination sensor comprises: a light source 3 consisting of a light-emitting element such as a semiconductor laser; and a photodetector 6 detecting light from the light source 3. In addition, a pendulum 4 provided with a guide 4a with a light passage hole between the light source 3 and the photodetector 6 is housed in a pendulum housing container 5 filled with high-viscosity liquid, and the container is attached to a holder 2. Further, the pendulum 4 transmits light from the base end side to the front end side, and thereby, detects that the inclination reaches a predetermined inclination when the photodetector 6 cannot detect light.

Description

  The present invention is installed in a two-wheeled vehicle, a four-wheeled buggy, a construction / agricultural four-wheeled vehicle, a construction special device (hereinafter referred to as a vehicle), etc., and automatically engine when the vehicle falls or when a predetermined inclination is reached. It relates to a tilt sensor switch for stopping.

  Conventional tilt sensor switches of this type include a casing attached to a vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, a magnet portion provided in the pendulum, A tilt sensor that includes a printed circuit board installed on the printed circuit board and a magnetic sensor installed on the printed circuit board, and outputs a predetermined signal according to the presence or absence of magnetism of the magnet unit received by the magnetic sensor according to the swing angle of the pendulum There is a switch (see Patent Document 1).

JP 2011-121529 A

  However, since the conventional tilt sensor switch uses a magnet, the operation may be unstable due to the influence of metal such as iron nearby. For this reason, there is a problem that the range of the place where the tilt sensor switch is installed is limited. Moreover, since there are many restrictions on directionality, there is a problem that it is difficult to deal with all directions. Furthermore, there are problems of durability and malfunction due to multiple vibrations.

  An object of the present invention is to solve the above problems.

  To achieve the above object, the present invention provides a light source comprising a light emitting element such as a semiconductor laser, a photodetector for detecting light from the light source, and a direction in which gravity acts between the light source and the photodetector. A pendulum storage container in which a suspended pendulum is stored. The pendulum is supported by a cap of the pendulum storage container on the base end side, and has a guide with a light passage hole on the front end side. The pendulum transmits light from the end side to the tip side, and is configured to detect that the detector has reached a predetermined inclination when light from the guide with the light passage hole cannot be detected.

  The base end side of the pendulum is processed into a sphere.

  Further, the pendulum storage container is filled with a highly viscous liquid.

  Furthermore, it is set as the structure which can vary the hole diameter of the said guide with a light passage hole which has in the front end side of the said pendulum.

As is clear from the above description, the present invention has the following effects.
(1) Since the sensor unit is configured with a light source and a photodetector so that there is no magnetic influence, the range of the location where the tilt sensor switch is attached can be expanded.
(2) Furthermore, by making the base end side of the pendulum spherical, it is possible to incline in all directions when the horizontal plane is used as a reference.
(3) Since the movement of the pendulum is restricted by filling a high-viscosity liquid, durability by vibration and prevention of malfunction can be improved.
(4) The operating angle can be changed by changing the diameter of the hole through which light passes.

External perspective view of a tilt sensor switch according to the present invention Exploded view of tilt sensor switch according to the present invention Diagram of integrated pendulum and guide with light passage hole AA sectional view when not inclined in FIG. AA sectional view when tilted in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an external perspective view of a tilt sensor switch according to the present invention. In FIG. 1, 1 is a substrate of a tilt sensor switch according to the present invention, 2 is a holder for mounting a pendulum storage container, 3 is a light source composed of a light emitting element such as a semiconductor laser, 5 is a pendulum storage container for storing a pendulum 4 described later, 7 Is a cap assembled to the pendulum storage container 5. In this way, the holder 2 is installed on the substrate 1, and the light source 3 is installed on the upper part of the holder 2 so that the light irradiation direction faces downward. Further, a storage container 5 and a cap 7 assembled under the light source 3 are attached.

  FIG. 2 shows an exploded view of the tilt sensor switch according to the present invention. In FIG. 2, 4 is a pendulum. A guide 4a with a light passage hole which will be described later is attached to the tip side of the pendulum 4 (lower side of the pendulum 4 in FIG. 2). Further, the base end side of the pendulum 4 (upper side of the pendulum 4 in FIG. 2) is processed into a sphere as shown in the figure. Thereby, the light passing from the light source 3 through the base end side of the pendulum 4 goes straight without being refracted.

  In FIG. 2, a portion of the cap 7 that supports the pendulum 4 is provided with a recess that is slightly larger than the base end side of the pendulum 4. Thus, after the pendulum 4 is attached, when the cap 7 is tilted in all directions with respect to a plane perpendicular to the direction in which gravity acts, the pendulum 4 faces in the direction in which gravity acts.

  In FIG. 2, reference numeral 8 denotes an O-ring, which is attached to the cap 7 in order to prevent leakage of a highly viscous liquid described later. The pendulum 4 supported by the cap 7 is stored in a pendulum storage container 5.

  Further, in FIG. 2, reference numeral 6 denotes a photodetector that detects light from the light source 3 and is attached to the lower portion of the holder 2 so as to face the light source 3.

  FIG. 3 shows an integrated view of the pendulum and the guide with a light passage hole. In FIG. 3, 4a is a guide with a light passage hole. The guide 4 a with a light passage hole is attached to the tip side of the pendulum 4. The light passage hole guide 4a is provided with a passage hole as shown in the figure. Thereby, the light from the light source 3 reaches the photodetector 6.

  If further manual adjustment is desired, the guide 4a with a light passage hole is overlapped with a plurality of non-transparent thin plates so as to provide a passage hole through which light passes at the center like a camera aperture. In addition, an adjustment tool that can change the passage hole is installed. This makes it possible to manually adjust the predetermined inclination to be detected.

  Next, FIG. 4 shows an operation when the tilt sensor switch according to the present invention is not tilted. In FIG. 4, light from the light source 3 passes through a cap 7, a pendulum 4, and a passage hole of a guide 4 a with a light passage hole, passes through the pendulum storage container 5, and reaches the photodetector 6.

  FIG. 5 shows a tilted tilt sensor switch according to the present invention. As described above, the light from the light source 3 travels straight without refracting the cap 7 and the pendulum 4 as shown in the figure. Furthermore, since the pendulum 4 is directed in the direction in which gravity acts as shown in the figure, when the angle reaches a predetermined angle, the light is blocked by the guide 4a with a light passage hole and the light does not reach the photodetector 6. At this time, it is determined that a predetermined angle has been reached.

  In FIG. 5, the operation by tilting in one direction is described as an example. However, in the present invention, the cap 7 can be tilted in all directions by processing the base end side of the pendulum 4 into a sphere. It is possible to determine that the predetermined angle has been reached in the same manner as described above.

  4 and 5, the pendulum storage container 5 is filled with a high-viscosity liquid for durability and prevention of malfunction due to multiple vibrations of the pendulum 4. For high-viscosity liquids, it is best to use liquids that have good permeability to allow light to pass through. For example, silicon oil is used that prevents expansion and coagulation due to heat and cold and prevents bubbles from forming. Also good.

  Since the tilt sensor switch according to the present invention uses light as described above, visible light, infrared light, or the like may be used as the light source. Further, it is desirable that the tilt sensor switch according to the present invention is formed of a resin material having good transparency in order to transmit light in the pendulum 4, the pendulum storage container 5, and the cap 7.

  Since the tilt sensor switch according to the present invention improves durability and malfunction due to multiple vibrations and is mounted without being affected by the mounting environment, the range of the mounting location is expanded. Therefore, industrial applicability is high.

DESCRIPTION OF SYMBOLS 1 ... Board | substrate of inclination sensor switch which concerns on this invention 2 ... Holder which attaches a pendulum storage container 3 ... Light source 4 ... Pendulum 4a ... Guide with light passage hole 5 ... Pendulum storage container 6 ... Photo detector 7 ... Cap 8 ... O-ring

Claims (4)

  A light source comprising a light emitting element such as a semiconductor laser, a photodetector for detecting light from the light source, and a holder for attaching a pendulum storage container in which a pendulum suspended in the direction of gravity is accommodated between the light source and the photodetector; Further, the pendulum is a pendulum having a proximal end supported by a cap of a pendulum storage container, having a guide with a light passage hole on the distal end side, and transmitting light from the proximal end side to the distal end side. An inclination sensor switch for detecting that a predetermined inclination is reached when the light detector cannot detect light from the guide with the light passage hole.   2. The tilt sensor switch according to claim 1, wherein a base end side of the pendulum is processed into a sphere.   2. The tilt sensor switch according to claim 1, wherein the pendulum storage container is filled with a highly viscous liquid.   2. The tilt sensor switch according to claim 1, wherein a hole diameter of the guide with a light passage hole provided on a tip side of the pendulum can be varied.

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