JP2005202649A - Display section of detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a display section of a detector which permits one light emitting element to perform clear light emitting display toward as many directions as possible and permits the confirmation of lighting in a bright room or outdoors. <P>SOLUTION: The display section is formed with a light guide molded with transparent resin buried therein. Inside the light guide, a cavity or a hole is provided. In a process where light emitted from a display lamp provided inside a cover is incident on the light guide, and is radiated from the surface of the light guide to the outside, the light is reflected or refracted on a boundary of a cavity part or the like, thus emitting the light in a plurality of directions from one display lamp. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a display unit of a detector that radiates light over a wide range, and relates to a technique for performing clear light emission display from one light emitting element in as many directions as possible.

An intruder detector and a device for detecting a fire are installed on a ceiling or the like in the room, and an indicator lamp such as an LED is turned on according to the detection operation. A security detector using a light guide made of a semitransparent synthetic resin has been devised so that the indicator lamp can be confirmed from any position in the room (for example, see Patent Document 1).
JP 2000-33263 A

A conventional light guide is made of a translucent molded product, and utilizes the fact that light from a light emitting diode from an entrance proceeds while reflecting inside the light guide, and the entire light guide appears to shine. It is possible to display a wide range by arranging the elongated light guide according to the shape of the sensor, but the whole is only brightly lit, and it is shining in a bright room or outdoors There is a problem that it is difficult to confirm.

The present invention forms a display unit in which a light guide molded with a transparent resin is embedded, and a light or a hole is provided inside the light guide, and light emitted from an indicator lamp provided inside the cover is the light guide. Is reflected or refracted at the boundary of the cavity or the like, and light is radiated in a plurality of directions from one indicator lamp.

A hollow or hole is provided in a light guide molded with a transparent resin, and the light flux of the LED is split into a plurality of light fluxes by utilizing the refraction and critical reflection of light generated when passing through these portions. Therefore, a shape in which light is distributed with emphasis on the three directions of the front and the left and right 90 degrees, and the remaining light is distributed in the other directions, and a display unit that emits light in a wide range is realized. Further, since the light can be distributed with priority in the necessary direction, a sufficient luminous intensity can be obtained in the light distribution direction, and it can also be adopted in an intruder detector installed outdoors or in a bright room. Since a transparent light guide along the curved surface of the dome type or cylindrical cover is realized, it is more suitable than installing a protruding LED or a translucent light guide different from the color of the cover. The appearance design can be refreshed. The light guide can be formed of resin molded parts, which is advantageous in terms of cost.

FIG. 1 is an external perspective view of a cover of a detector employing the display unit of the present invention, and FIG. 2 is an external perspective view of the main body of the detector. A light guide 1 and a semi-cylindrical Fresnel lens 3 are attached to the cover 2. An optical system unit 5 and an optical system unit 6 are supported by the main body 4 so as to be rotatable 90 degrees (180 degrees) in the left and right directions, and an upper part of the light emitted from a display LED (not shown) is provided at the upper part. 15 is provided. The Fresnel lens 3 is composed of 13 vertically long lens groups focused on infrared detecting elements (not shown) built in the optical system units 5 and 6. The infrared detection element has a viewing angle of about 90 degrees. With this infrared detection element and the Fresnel lens 3, the direction toward the optical system unit (the center of the field of view of the infrared detection element) is 90 degrees. Seven detection zones having a spread are configured.

FIG. 3 is an enlarged cross-sectional view of the display unit of the detector of the present invention. This figure shows a state cut by a horizontal plane including the light guide 1 in a state where the cover 2 is mounted on the detector body 4. The upper part of FIG. 3 is the front direction of the detector. The cover 2 is fitted with a light guide 1 molded of a fan-shaped transparent resin having a thickness of about 5 mm. The upper surface of the light guide 1 in the figure is integrated with a cylindrical surface along the curve of the cover 2. Below, the light guide 15 on the main body 4 side is arranged at a close distance, and light enters the light guide from this portion. A light emitting diode (LED) 13 is disposed below the light guide 15 via a light guide tube 14 made of glossy metal. The LED 13 is further connected to a lower printed circuit board (not shown), and performs the operation of turning on and off according to the detection operation of the detector.

The fan-shaped light guide 1 is provided with two long holes 11 and 12 that are radially formed around a portion corresponding to the main part of the fan. The LED 13 is a high-luminance type with sharp directivity, and enters the light guide 1 through the light guide tube 14 through the light guide tube 14 to minimize light loss during this period. . Of the light incident on the light guide 1, the light traveling in the front direction passes through between the long hole 11 and the long hole 12, travels straight through the light guide 1 and is projected in the front direction of the detector. Of the light incident on the light guide 1, the light traveling in the left direction from the front is refracted slightly to the left by the chevron cut portion provided in the light incident portion of the light guide, and is located at the lower left of the elongated hole 11. The light is totally reflected at the boundary surface, and further refracted when the light in the upper left of the light guide 1 is led out and turned left. Finally, the light is projected in the direction of 90 degrees to the left with respect to the front direction of the detector. Contrary to this, the light that has entered the light guide 1 and that travels to the right slightly from the front is refracted slightly to the right by the angled cut portion provided in the light incident portion of the light guide. The light is totally reflected at the lower right boundary surface of the hole 12, further refracted when light is emitted from the upper right of the light guide 1, bent to the right, and finally projected in the direction of 90 degrees to the right with respect to the front direction of the detector. Is done.

The light incident in the intermediate direction of the three directions described above is totally reflected at the boundary surface facing the center of the long hole 11 and the long hole 12, and is refracted when the light is led out. Proceed in a direction at a shallower angle than the direction of 90 degrees left and right with respect to the front direction. In addition, the light passing through the boundary surface between the long hole 11 and the long hole 12 without being totally reflected is refracted and reflected, and finally travels in a direction other than the five directions and is projected from the detector.

According to the display unit of the detector having the above configuration, the light of the LED notifying the detection operation is projected in the direction of 180 degrees from the surface of the light guide, so that the optical system unit 5 and the optical system unit 6 are Regardless of the direction of 90 degrees (180 degrees) left and right, a human can walk in the formed detection zone, and the detection operation of the detector can be confirmed from all directions. When the display portion of the detector of the present invention was tested outdoors in the daylight where sunlight fell, it was sufficiently visible even from a location 10 meters away from the detector.

The above is related to a display unit in which a light guide molded with a substantially fan-shaped transparent resin is embedded in a part of a cylindrical cover, but a curved surface, for example, a part of a dome-shaped cover is made of a transparent resin. Even if a display unit with a molded light guide embedded is provided, and a cavity is provided inside the light guide by a method such as forming bubbles, a display unit that projects LED light radially can be realized using the same principle. Is done. That is, light emitted from the indicator lamp provided inside the cover enters the light guide and is reflected or refracted at the boundary of the cavity in the process from the light guide surface to the outside. The light is emitted from the indicator light in a plurality of directions. By devising the shape of the cavities and holes formed in the light guide, a display unit that distributes light in the required direction is realized, and all devices including intruder detectors and fire detectors are realized. The present invention is effective as a configuration of the display unit.

It is an external appearance perspective view of the cover of the detector which employ | adopted the display part of this invention. It is an external appearance perspective view of the main body of a detector. It is an expanded sectional view of the display part of the detector of the present invention.

Explanation of symbols

1 ... Light guide 11 ... Slot 12 ... Slot 13 ... LED
14 ... Light guide tube 15 ... Light extraction part

2 ... Cover 3 ... Fresnel lens 4 ... Body 5 ... Optical system unit 6 ... Optical system unit

Claims (2)

A display part in which a light guide molded with a transparent resin is embedded in a part of a curved cover, and a light is emitted from an indicator lamp provided in the cover in the light guide. In the process from entering the light guide and being emitted to the outside from the light guide surface, the light is reflected or refracted at the boundary of the cavity, and light is emitted from a single indicator in a plurality of directions. Detector display. A display part in which a light guide molded with a substantially fan-shaped transparent resin is embedded in a part of a cylindrical cover, and the light guide has a plurality of radial shapes centered on a portion corresponding to the main part of the fan. In the process until the light emitted from the indicator lamp provided inside the cover enters the part corresponding to the main part of the light guide and is emitted to the outside from the surface of the light guide, Detector display unit configured to reflect or refract at the boundary and emit light in multiple directions from one indicator lamp

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