JPS63277988A - Heat-ray type detector - Google Patents

Abstract

PURPOSE:To facilitate assembling operation and to make a heat-ray type detector attractive by molding plural Fresnel lens groups which have different warning patterns unitedly and allowing a heat-ray transmission cover to be detached. CONSTITUTION:Plural Fresnel lens groups 2 which have different warning patterns are molded unitedly inside the heat-ray transmission cover 3 made of polyethylene, etc. The heat-ray transmission cover 3 is mounted on a base member 1a so as to cover a detector unit incorporating a heat-ray detecting element. The heat-ray transmission cover 3 is fitted detachably to the front of the detector main body so that the Fresnel lens groups 2 corresponding to warning areas are positioned in front of the heat-ray detecting element. Consequently, the assembling operation is facilitated and the cost is reduced. Further, there is no burr at the time of the molding and no Fresnel lens group projects outside, so the detector becomes attractive, a trespasser can not know where is guarded, and warning patterns are easily changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot-ray detector equipped with a plurality of Fresnel lens groups having different warning patterns.

[Prior art]

Conventionally, heat-ray detectors detect heat rays emitted from the human body and output alarm signals, and heat-ray detectors equipped with multiple Fresnel lens groups with different warning patterns collect current within the detector body. A detector unit incorporating a heat ray detection element such as a heat ray detection element is provided, and a cylindrical cover is further provided around the detector unit. There are holes in several places on the side wall of the cover for fitting Fresnel lens groups, and several Fresnel lens groups with different warning patterns are inserted into the holes, such as 3D near-distance, 3D long-distance, and surface. It is fitted and fixed with the circumference facing outward. When the heat ray detector is installed, the cover is rotated so that the Fresnel lens group to be used is placed in front of the heat ray detection element.

As a result, even one hot-ray detector has a plurality of Fresnel lens groups with different warning patterns, so it is possible to easily select a Fresnel lens corresponding to a warning area.

[Problems to be solved by the present invention]

However, in such conventional hot-wire detectors, holes are made in the side wall of the cover to fit several Fresnel lens groups with different warning patterns, and the Fresnel lens groups are fitted into the holes. As a result, the number of parts increases, the assembly work is complicated, and the cost of parts increases.

Furthermore, since the Fresnel lens group that is fitted into the cover is fitted and fixed facing outward, the edges that appear during Fresnel lens molding are exposed to the outside, making it look bad (and the Fresnel lens group can also be seen from the outside). Because of this, there was a problem in that even an intruder could see which area they were guarding.

[Means for solving problems]

The present invention has been made in view of the conventional problems, and provides a hot-wire type detector that does not require assembling work to be equipped with a plurality of Fresnel lens groups with different warning patterns (and has an improved appearance). The purpose is to

In order to achieve this object, in the present invention, a plurality of Fresnel lens groups with different warning patterns are integrally molded inside a heat ray transmitting cover made of polyethylene or the like, and among the plurality of Fresnel lens groups, a warning area is A heat ray transmitting cover can be attached so that the corresponding Fresnel lens group is positioned in front of the heat ray detection element.

[Effect]

In the heat-ray detector of the present invention having such a configuration, assembly work is facilitated by integrally molding a plurality of Fresnel lens groups with different warning patterns inside the heat-transmitting cover made of polyethylene or the like. In addition, the cost can be reduced, and since the Fresnel lens group is not visible from the outside, the appearance is improved.

Fresnel lens group (2) inside the heat ray transparent cover (3)
By attaching this, you can prevent dust from accumulating in the groove of the window from the outside of the Fresnel lens group (2), which not only prevents the window from being seen but also maintains its aesthetic appearance. By integrally molding the Fresnel lens group (2) inside the heat ray transmitting cover (3) made of polyethylene, etc., and as a result, molding the Fresnel lens group (2) inside the heat ray transmitting cover (3), the molding It looks good because the paris that sometimes appears does not show on the outside. Furthermore, by making the heat ray transparent cover freely attachable, it becomes possible to easily change the warning pattern to correspond to the warning area.

〔Example〕

The embodiment shown in FIG. 1A and FIG.
．． Cut out a hemispherical part to a depth of 6 cm and cut it into a head (1
) and a heat ray transparent cover (3) made of polyethylene or the like, and has an annular base (1a). This heat ray transmitting cover (3) made of polyethylene or the like has a plurality of Fresnel lens groups (2) with different warning patterns integrally molded inside. In addition, the heat ray transmitting cover (3) is attached to the base member fixed to the detector body so as to cover the detector unit containing the heat ray detection element.A heat ray transmitting cover (3) is attached to the base member fixed to the detector body so as to cover the detector unit containing the heat ray detection element. A Fresnel lens group (2) is installed in front of the heat ray detection element so that the heat ray transmission cover (3) can be inserted into the sensor unit.Furthermore, the detector unit can be inserted diagonally into the detector body. The installed Fresnel lens group (2) in Figure 0 shows the position.In this example, the multiple Fresnel lens groups (2) for ceiling and wall are heated in a three-dimensional monitoring type. The large number of sections in Figure 0 that are integrally molded inside the vA transmission cover (3) are split type spherical Fresnel lens group light windows corresponding to cut-out parts of the spherical Fresnel lens group, and the section area (plane equivalent) are 25 to 4008 m'', respectively.

With one segmented condensing window L, detection of far and near regions within 4 to 10 degrees in the horizontal direction and 4 to 10 degrees in the vertical direction can be performed in accordance with conventional standards. Expand the detection area according to the number of parallel connections. Corresponding to the position on the spherical surface, we determined the part of the spherical Fresnel lens group that would have less undercut when cutting from the spherical mold to prevent this from occurring, and created band-shaped and professional lenses.
Combining light-concentrating windows in the shape of a prick.

The ceiling detection part (3a) and the wall detection part (4a) are approximately 3 in length.
It is divided into two bisecting lines at the 1/10th position.

The far point area condensing sections (5a) and (5b) are a band-shaped condensing window group in which spherical Fresnel lens condensing windows are arranged in a band shape, and the near point area condensing sections (7a) and (7b) are Here, it is a block-shaped condensing window group composed of two divided Fresnel lens cluster light windows. Furthermore, the intermediate area condensing section (6a), (6
b) is formed by a band-shaped condensing window group.

As shown in Figures 2A, 2B, and 2C, the far point area condensing section (
5a) and (5b), here, one Fresnel lens cluster light window is arranged in a continuous spherical shape and a band shape, and covers about 800 in the horizontal direction (horizontal) and about 10 in the vertical direction (vertical). ° Cover (Yo). - the lateral angle of each piece is approximately 10” (Xo).
) and (7b) are block-shaped light collecting windows configured by two light collecting windows arranged in a strip shape and two light collecting windows arranged vertically. The coverage range is approximately 60@ in the horizontal direction and approximately 30' in the vertical direction, and can cover the area below the installation position. The content of this block-shaped condensing window group can be made into a single split spherical Fresnel lens depending on how the block is divided. The standard coverage range of sensor head I is 90 degrees in the horizontal direction and 80 degrees in the vertical and horizontal directions, and the coverage angle can be increased depending on the design.The detector head has a ceiling detection section and a wall detection section. Since the far-point area and near-point area are formed in the same or similar pattern in each detection part, one type of head is used for the ceiling and the other for the wall, making it possible to manufacture the same type of head as before. In addition to being able to reduce the cost compared to manufacturing two types of
The detection area in the vertical direction has been expanded to enable full-fledged cubic direction detection. By integrally molding the head and light condensing section, the head interior is maintained and stability against changes in environmental conditions is improved, and the expanded detection direction greatly facilitates on-site adjustment.

Further, FIG. 3 shows an example of division of spherical Fresnel lens groups. The concentric circular lens elements can be made arcuate to reduce the amount of undercut and combine with the difference in light gathering ability of the arcuate lens elements to adjust the coverage area. An example of creating a half-split type ■ with an inner dividing line S passing through the smallest circle of the lens element. This inner lot line is perpendicular to the vertical lot line at the center of the smallest circle, and the four-part cutout is made by the inner lot line.■
In this example, the lens element mold surface will not have undercuts in the two directions of the notch.

In addition, an example of a free-split type ■ with a rectangular cutout having two inner partition lines and an outer partition line S parallel to each other has no undercuts in three directions, and the lens elements contained therein do not have undercuts in three directions. Utilizing the fact that the arc is a 6Ijl narrow curve, even if an undercut may appear depending on the die cutting, it will be small, so there is no risk of damaging the lens characteristics due to the die cutting, and the inner dividing line S can be minimized. An example of a semi-halved type moved to the position of the semi-compartment line S1 beyond the circular lens element is also used.

Each condensing window integrally formed in the head 1 is integrally molded by selecting an appropriate partially split spherical Fresnel lens group based on its position and die cutting direction, and using that mold. FIG. 4 shows another example of the setting of the light collecting section along with the current collecting sensor M. In the above embodiment, a three-dimensional monitoring type Fresnel lens group for ceiling and wall was integrally molded inside the heat ray transmitting cover, but the present invention is not limited to this.
For example, the face! A molded Fresnel lens group for the ceiling and a wall is integrally molded inside a heat ray transparent cover, or a 3D near-distance M warning type, a 3D long distance type, and a surface warning type make the Fresnel lens group for the wall transparent to heat rays. Any combination of different Fresnel lenses, such as one integrally molded inside the cover, may be used.

〔Effect of the invention〕

By integrally molding multiple Fresnel lens groups with different warning patterns inside the heat-transmitting cover made of polyethylene or the like of a heat-ray detector, assembly work is easy and costs are reduced. This prevents dust from accumulating in the grooves of the window from the outside, which not only prevents the window from being seen, but also maintains its aesthetic appearance. The Fresnel lens group is integrally molded inside the heat ray transmitting cover, and as a result, the Fresnel lens group is molded on one side of the heat ray transmitting cover, so that the particles that come out during molding do not come out to the outside, and the Fresnel lens group It looks good because it does not expose itself to the outside, and by making the heat VA transparent cover freely attachable, it becomes possible to easily change the warning pattern to correspond to the warning area.

[Brief explanation of drawings]

Fig. 1A is a side view of the detection head, Fig. 1B is a plan view thereof, Fig. 2A is an explanatory diagram showing the horizontal direction of the detection direction, Fig. 2B
The figure is an explanatory diagram showing the vertical direction of the detection direction when installed on the ceiling.
Figure C is an explanatory diagram showing the vertical direction of the detection direction when installed on a wall.
The figure is a plan view showing an example of dividing a spherical Fresnel lens.
The figure is a perspective view showing an example of a detector. l: Detection head la: Base 3a: Ceiling detection part
4a: Wall detection unit 5a, 5. b = far point area light condensing area
7a, 7b = periapsis area condensing section L = condensing window

Claims (1)

[Claims] A detector body, a detector unit with a built-in heat ray detection element provided in the detector body, and a plurality of Fresnel lens groups with different warning patterns that are attached to cover the detector unit and the detector body are installed inside. The heat ray transmitting cover is provided with a heat ray transmitting cover, and the heat ray transmitting cover is freely attached so that the Fresnel lens group corresponding to the warning area among the plurality of Fresnel lens groups is positioned in front of the heat ray detecting element. Expression detector.