JP6565255B2 - Light alarm device and lens thereof - Google Patents

Description

  The present invention relates to a light alarm device and a lens thereof. In particular, the present invention relates to a light alarm device installed on a wall and its lens.

  In the photoelectric smoke detector, a diffuser using a wide-angle lens and a diffusion plate is known as a diffuser that diffuses a light-emitting beam emitted from a light-emitting element (see, for example, Patent Document 1). In addition, as a light alarm device, light from an LED (Light Emitting Diode) module is reflected and diffused using a reflecting member, and light that satisfies the light irradiation range and light intensity defined by the ISO standard (ISO 7240-23, ceiling-mounted type). An alarm device is known (see, for example, Patent Document 2). On the other hand, there is a need for a technique that satisfies the light irradiation range and luminous intensity defined by the ISO standard (ISO 7240-23, wall-mounted type) with a simple structure with a small number of parts.

JP-A-9-161176 Japanese Patent Application Laid-Open No. 2014-67260

  The present invention provides a light alarm device having a simple structure with a small number of parts and a lens that satisfies the light irradiation range and luminous intensity defined by the ISO standard (ISO 7240-23, wall-mounted type) and its lens.

(1) A first aspect according to the present invention is a light alarm device installed on a wall, comprising: a light source directed forward; and a lens for guiding light emitted from the light source; Is located above the light source and guides light upward from the light source to the front, and a first lens unit positioned in front of the light source and guides light forward from the light source obliquely downward to the front. 2 and a third lens part that is located below the light source and guides light downward obliquely forward from the light source , and the first lens part is in a side sectional view. the light source intersects with the surface opposite horizontal imaginary line and a predetermined tape path angle θ1 above, it formed the light from the light source so as to totally reflect the second lens unit, in the upper cross section, the inner surface and the shape of the outer surface is formed in a substantially arcuate shape to continuously alter the toroidal surface radius of curvature, the third lens Part is, in the upper cross section, to provide an optical alarm device is formed in a vertical substantially semi elliptical to interior and exterior surfaces toroidal surface shape is changed curvature radius continuously in.
(2) A second aspect of the present invention is a lens you guiding light emitted from a light source directed to the front, and located above the light source, the light directed upwards from the light source to the front A first lens part for guiding light; a second lens part for guiding light directed forward from the light source forward and obliquely downward; and a lower part of the light source and obliquely forwardly directed from the light source A third lens portion that guides light directed toward the lower side, and the first lens portion has a horizontal phantom line and a predetermined taper angle θ1 or more on a side opposite to the light source in a side sectional view. It intersects and is formed so as to totally reflect light from the light source , and the second lens portion has a substantially arc shape in which the shape of the inner surface and the outer surface is a toroidal surface whose curvature radius is continuously changed in the upper sectional view. is formed, the lens unit of the third is in the upper cross section, the inner surface and the radius of curvature shape of the outer surface To provide a lens that is formed in a substantially semi-elliptical shape to continuously alter the toroidal surface.

  According to the present invention, it is possible to provide a light alarm device and its lens that satisfy a light irradiation range and luminous intensity defined by the ISO standard (ISO 7240-23, wall-mounted type) with a simple structure with a small number of parts.

It is the schematic which shows the installation state of the light alarm apparatus which concerns on embodiment of this invention. It is a perspective view which shows a light alarm apparatus and a lens. It is a disassembled perspective view of an optical alarm device. (A) is a front view which shows a light alarm device and a lens, (b) is a side view. (A) is the perspective view seen from the front side of a lens, (b) is the perspective view seen from the back side of the lens. (A) is AA partial sectional drawing in Fig.4 (a), (b) is BB partial sectional drawing, (c) is CC partial sectional drawing. (A) used for the display of the light distribution characteristic of a light alarm apparatus is a figure which shows the altitude angle (alpha), (b) is a figure which shows the horizontal angle (beta). (A) is a light distribution characteristic when the altitude angle α is 0 °, (b) is a light distribution characteristic when the altitude angle α is 50 °, and (c) is a light distribution characteristic when the altitude angle α is 80 °. FIG.

  An optical alarm device according to an embodiment of the present invention is an optical alarm device 1 installed on a wall W, and includes a light source L directed forward, a lens 100 that guides light emitted from the light source L, and It has. As the light source L, for example, an LED can be used. Here, the light source L is not limited to the LED, and any light source can be used as long as the light intensity can be obtained. Moreover, the color of the light source L can use white or red.

  Hereinafter, the light alarm device 1 installed on the wall W will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the light alarm device 1 detects smoke, temperature, etc., and notifies it by flashing light. For example, the light alarm device 1 is substantially above the walls W of a rectangular parallelepiped room R from both side walls. It is installed at an equal distance. In FIG. 1, the upper side toward the paper is the ceiling side. As for the light alarm device, the ISO standard (ISO 7240-23, wall-mounted type) emits light from the light alarm device so that a person in a rectangular parallelepiped room (excluding blind spots) can be seen from an emergency such as a fire from anywhere. The luminous intensity (cd) in the irradiation range of the light is defined.

  As shown in FIGS. 2 and 3, the light alarm device 1 includes a case 10, a cover 20, a base member 30, a substrate 40, and a lens 100. The case 10 accommodates a substrate 40 on which a sensor for detecting smoke, temperature, and the like, a light source L, and the like are mounted, and an opening 11 for the lens 100 is formed. The lens 100 is attached to the opening 11 from the inside.

  The cover 20 is engaged with the case 10. More specifically, the case 10 and the cover 20 are positioned by the notches 12 a and 12 b provided in the case 10 and the protrusions 22 a and 22 b provided in the cover 20. It is fixed with screws (not shown).

  The base member 30 is internally provided with a terminal block and the like, and an engagement groove 31 is formed corresponding to the protrusions 22a and 22b of the cover 20. The cover 20 is attached to the base member 30 by engaging the protrusions 22 a and 22 b of the cover 20 with the engagement groove 31 of the base member 30 and rotating the case 10 and the cover 20 in an engaged state. The light alarm device 1 is attached to the wall W by an attachment structure (not shown) provided on the side opposite to the cover 20 attached to the base member 30.

  A drive circuit (not shown) for driving the light source L is mounted on the substrate 40. The drive circuit controls the light source L to blink. The light emission period is preferably set in the range of 0.5 Hz to 2 Hz, for example.

  As shown in FIG. 4, the case 10 has a substantially circular shape when viewed from the front, and the lens 100 protrudes and is mounted slightly above the center. In FIG. 4, the upper side toward the paper surface corresponds to the ceiling side of the room R in FIG. As shown in FIGS. 3 and 4, a protrusion 13 is formed from the case 10 above the lens 100. The protrusion 13 reduces adhesion of dust or the like that falls on the lens 100 from above.

  Hereinafter, the lens 100 will be described in more detail. As shown in FIGS. 4, 5, and 6, the lens 100 is positioned above the light source L, the first lens unit 110 that guides light upward from the light source L forward, and the front of the light source L. 2nd lens part 120 which guides the light which goes ahead from the light source L diagonally forward, and is located under the light source L, and guides the light which goes diagonally forward from the light source L downward. A third lens unit 130.

  Further, the lens 100 includes a collar 140, which acts as a stopper when the lens 100 is attached to the opening 11 of the case 10 from the inside, and determines a forward position with respect to the case 10. Further, the collar 140 is formed with a protrusion 141 and a protrusion 142. The protrusions 141 position the lens 100 with respect to the case 10 when the lens 100 is attached to the opening 11 shown in FIG. By fitting the protrusion 142 into the substrate 40, the lens 100 is positioned with respect to the light source L mounted on the substrate 40.

  As shown in FIG. 6, in the first lens unit 110, the side 111 opposite to the light source L intersects the horizontal phantom line H at a critical angle or more in a side sectional view, and all the light from the light source L is transmitted. The second lens unit 120 is formed to reflect, and is formed in a substantially arc shape in the upper cross-sectional view, and the third lens unit 130 is formed in a vertical substantially semi-elliptical shape in the upper cross-sectional view. ing.

As shown in FIG. 6A, the first lens unit 110 is formed so that the surface 111 on the side opposite to the light source L has a taper angle θ ₁ intersecting the horizontal imaginary line H in a side sectional view. Has been. If the material of the lens 100 is a polycarbonate resin, a refractive index of about 1.59, the critical angle theta ₂ of the light directed into the air from a polycarbonate resin is about 39 °. Here, by setting the taper angle θ ₁ to 28.62 ° or more, the light traveling upward from the light source L can be totally reflected on the surface 111 opposite to the light source L and directed forward. . Here, the material of the lens 100 is not limited to polycarbonate resin, but may be acrylic resin, glass, or the like. Since the critical angle varies depending on the refractive index of the lens 100, the value of the taper angle θ ₁ may be determined according to the refractive index of the lens 100.

  As shown in FIG. 6B, the second lens portion 120 is formed in a substantially arc shape when viewed from above, but more specifically, can be formed as described below. The shape of the inner surface 121 and the outer surface 122 that determine the shape of the second lens unit 120 is a toroidal surface with the curvature radius continuously changed so that light directed forward from the light source L is guided obliquely forward and downward. Can do. The shape of these surfaces can be designed by simulation according to the positional relationship between the second lens unit 120 and the light source L. In designing, light is not only guided obliquely downward in the front direction, but also designed to spread in the lateral direction.

  As shown in FIG. 6C, the third lens portion 130 is formed in a vertical semi-elliptical shape in the upper cross-sectional view. More specifically, the third lens portion 130 is formed as described below. be able to. The shape of the inner surface 131 and the outer surface 132 that determine the shape of the third lens unit 130 is a toroidal surface with a curvature radius continuously changed so as to guide light directed downward and downward from the light source L downward. Can do. The shape of these surfaces can be designed by simulation according to the positional relationship between the third lens unit 130 and the light source L, similarly to the second lens unit 120. In designing, not only the light is guided downward but also designed to spread in the lateral direction.

  The lens 100 can be formed by injection molding a resin having high transmittance such as polycarbonate or acrylic resin. If the glass has a high transmittance, it can be formed by compression molding, polishing, or the like.

  In order to check whether the light alarm device 1 according to the embodiment satisfies the light irradiation range and the light intensity defined by the ISO standard (ISO 7240-23, wall-mounted type), the light distribution characteristics of the light alarm device 1 according to the embodiment are determined. Examined. The irradiation direction of the light emitted from the lens 100 is defined by the altitude angle α and the horizontal angle β. As shown in FIG. 7A, the altitude angle α is an angle from the lower wall W with respect to the lens 100. The altitude angle α ranges from 0 ° in the downward direction to 90 ° in the forward direction. As shown in FIG. 7B, the horizontal angle β is an angle from one side with respect to the lens 100. Since the light alarm device 1 is installed on the wall W, the horizontal angle β ranges from 0 ° to 180 °.

  8A, 8B, and 8C, FIG. 8A shows α = 0 °, FIG. 8B shows α = 50 °, and FIG. 8C shows α = The light distribution characteristic at 80 °. The luminous intensity determined by the ISO standard (ISO 7240-23, wall-mounted type) is indicated by a broken line, and the measured luminous intensity in the embodiment is indicated by a solid line. Each figure is a pie chart, showing the luminous intensity (cd) concentrically toward the outer periphery and the horizontal angle β in the circumferential direction. The ISO standard here (ISO 7240-23, wall-mounted type) is that the light alarm device 1 is placed on one wall of a rectangular parallelepiped room with a floor of 12.5 m square, from the walls on both sides at a height of 2.4 m. It is a standard that assumes the case where the distances are set at the same intermediate position.

  The measurement conditions were as follows. A white LED was used as the light source L. The driving conditions of the LED were a DC voltage of 24 V applied, a current consumption of 52 mA, and a light emission period of 1 Hz. Moreover, the environmental temperature at the time of measurement was 24 degreeC. The measurement was performed at a position 3.0 m from the lens 100.

  The measurement values at the measurement points between altitude angles of α = 0 °, α = 50 °, α = 80 ° and the horizontal angle β = 0 ° to 180 ° are ISO standards (ISO 7240-23) at any measurement point. The light intensity greater than the light intensity determined by the wall-mounted type was obtained.

  According to the light alarm device 1 and the lens 100 thereof according to the present embodiment, the lens 100 includes the first lens unit 110 that guides the light traveling upward from the light source L forward. Of the light emitted from the light source L of the light alarm device 1 installed in the light, the upward light that does not contribute to the downward irradiation from the front of the room can be used effectively. In addition, since the second lens unit 120 that guides light traveling forward from the light source L diagonally forward and downward and the third lens unit 130 that guides light directed diagonally downward forward from the light source L downward is provided. The light intensity in the irradiation range can be adjusted by each lens unit. Accordingly, it is possible to provide the light alarm device 1 and its lens 100 that satisfy the light irradiation range and the light intensity defined by the ISO standard (ISO 7240-23, wall-mounted type) with a simple structure with a small number of parts.

  Further, in the above-described embodiment, the ISO standard (ISO 7240-23, wall-mounted type) is such that the light alarm device 1 is placed on one wall of a rectangular parallelepiped room having a floor of 12.5 m and a height of 2.4 m. Even if the standard is based on the assumption that the distance from the walls on both sides is the same, the irradiation range and intensity of light can be obtained.

  Further, the light alarm device and its lens according to the present invention are not limited to the light alarm device 1 having the light distribution characteristic shown in the embodiment and the lens 100 thereof. Since the light distribution characteristics can be adjusted by the design of the first lens unit, the second lens unit, and the third lens unit, the light irradiation range defined by the ISO standard (ISO 7240-23, wall-mounted type) and It may be a light alarm device having other light distribution characteristics satisfying the luminous intensity and its lens.

  The lens according to the present invention can be applied not only to the light alarm device but also to other devices. For example, it can be applied to lighting fixtures installed on walls, emergency lights during power outages, guidance, and the like.

DESCRIPTION OF SYMBOLS 1 Light alarm device 10 Case 11 Opening 12a, 12b Notch part 13 Protrusion part 20 Cover 22a, 22b Protrusion 30 Base member 31 Engagement groove 40 Board | substrate 100 Lens 110 1st lens part 111 Opposite surface 120 2nd lens Portion 121 inner surface 122 outer surface 130 third lens portion 131 inner surface 132 outer surface H horizontal imaginary line L light source R room W wall θ ₁ taper angle θ ₂ sea angle

Claims (2)

A light alarm device installed on the wall,
A light source directed forward;
A lens for guiding the light emitted from the light source,
The lens is
A first lens unit that is located above the light source and guides light upward from the light source forward;
A second lens unit that is positioned in front of the light source and guides light directed forward from the light source diagonally downwardly forward;
A third lens portion that is located below the light source and guides light that is obliquely forward and downward from the light source , and
The first lens unit is formed so that a surface opposite to the light source intersects a horizontal imaginary line at a predetermined taper angle θ1 or more in a side sectional view and totally reflects light from the light source. ,
The second lens portion is formed in a substantially arc shape in which the shape of the inner surface and the outer surface is a toroidal surface in which the radius of curvature is continuously changed in an upper sectional view ,
The light alarm, wherein the third lens portion is formed in a vertical semi-elliptical shape in which the shape of the inner surface and the outer surface is a toroidal surface in which the radius of curvature is continuously changed in an upper sectional view. apparatus. A lens for guiding light emitted from a light source directed forward;
A first lens that is located above the light source and guides light upward from the light source forward And
A second light source located in front of the light source and guiding light directed forward from the light source diagonally forward and downward; The lens part,
A third light guide that is located below the light source and that guides light downward and obliquely downward from the light source; With a lens part,
When the first lens portion is in a side sectional view, the surface opposite to the light source is a horizontal imaginary line. Intersecting at a predetermined taper angle θ1 or more and formed so as to totally reflect light from the light source,
The second lens portion has a continuous radius of curvature in the shape of the inner surface and the outer surface in an upper sectional view. It is formed in a substantially arc shape with a toroid surface changed to
The third lens portion has a continuous radius of curvature in the shape of the inner surface and the outer surface in an upper sectional view. It is formed in a semi-elliptical shape with a toroidal surface changed to
A lens characterized by that.

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