JP2003215313A - Wide angle lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize the part of a wide angle lens facing to project outward from the window hole of a housing. <P>SOLUTION: The wide angle lens is formed in shape to integrally possess a cylinder 101 where a sensor is arranged on its shaft, a tapered surface 102 inclined inwardly along the front of the shaft of the cylinder 101 from the aperture side at the front part of the cylinder 101, a flange 103 extended inwardly from the inner peripheral edge of the surface 102, and a domed collection lens 104 extended forward from the inner peripheral edge of the flange 103. The lens 104 is formed in shape to possess a plurality of A-lenses peripherally provided around the shaft of the cylinder 101 in a plane state, a plurality of B-lenses peripherally provided in tapered surface shape tilted outward along the rear of the shaft of the cylinder 101 from the outer peripheries of the A- lenses, and a plurality of C-lenses peripherally provided in the tapered surface shape tilted outward along the rear of the shaft of the cylinder 101 from the outer peripheries of the B-lenses and connected to the inner periphery of the flange 103. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a housing having a window hole on one surface thereof, and is used in a sensor device in which a sensor having a detection surface facing outward from the window hole of the housing is incorporated in the housing. The present invention relates to a wide-angle lens which is provided in front of a detection surface and faces outward from a window hole of a housing.

[0002]

2. Description of the Related Art Conventionally, as a sensor device including a housing having a window hole on one surface, a lens facing outward from the window hole of the housing, and a sensor for receiving light condensed by the lens, Various sensor devices such as a human body detection device provided with a heat ray sensor for detecting a heat ray emitted from a human body or an automatic switch with a heat ray sensor are commercially available.

[0003]

By the way, a wide-angle lens is sometimes used in the above-mentioned automatic switch with a heat ray sensor. For example, when the automatic switch with a heat ray sensor is a ceiling-mounted type, it can be removed from the window hole of the housing. There is a problem that the wide-angle lens that projects downward and faces becomes large in size.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wide-angle lens capable of reducing the size of the portion of the wide-angle lens which projects outward from the window hole of the housing and faces. .

[0005]

The invention according to claim 1 for solving the above-mentioned problems is provided with a housing having a window hole in one surface thereof, and a sensor having a detection surface directed outward from the window hole of the housing. A wide-angle lens that is used in a sensor device that is built in the housing, is provided in front of a detection surface of the sensor, and faces outward from a window hole of the housing, wherein the sensor is arranged on an axis; A tapered surface portion that inclines inward from the front opening side of the cylindrical portion along the axial front of the cylindrical portion, a collar portion that extends inward from the inner peripheral edge of the tapered surface portion, and a front portion from the inner peripheral edge of the collar portion. Integrally formed with a dome-shaped collective lens portion extending to
The collective lens portion is provided with a plurality of first lens portions circumferentially provided around the axis of the cylindrical portion and outwardly along the axial rear of the cylindrical portion from outer peripheral edges of the plurality of first lens portions. A plurality of second lens portions that are circumferentially provided in a taper surface shape that is inclined to the outside, and a taper surface shape that is outwardly inclined from the outer peripheral edges of the plurality of second lens portions along the axial rear of the cylindrical portion. And a plurality of third lens portions connected to the inner peripheral edge of the collar portion.

According to a second aspect of the invention, in the wide-angle lens according to the first aspect, the sensor is mounted on a printed circuit board and is housed in a box body having a circular opening edge portion, and The inner surface is formed with a plurality of ribs that come into contact with the printed circuit board in a state in which an opening edge portion on the rear side of the cylindrical portion is close to the opening edge portion of the box body.

[0007]

1A is a front view of a wide-angle lens according to an embodiment of the present invention, FIG. 1B is a side view of the wide-angle lens, and FIG. 1C is a sectional view of the wide-angle lens. 2 is an exploded perspective view of a heat ray sensor-equipped automatic switch device using the same wide-angle lens, and FIG. 3 is a partially cutaway side view of the heat ray sensor storage portion in FIG. 2. With reference to these figures, the present embodiment will be described. Will be described.

First, an automatic switch device with a heat ray sensor will be described. As shown in FIG. 2, this device has a pair of holding grooves 111b on both sides with a window hole 111a therebetween so that it can be mounted on a ceiling. A body composed of a disc-shaped flange portion 111 having a groove and a cylindrical portion 112 which is integrally formed in the center of the upper surface and has four engaging projections 112a integrally formed at the upper edge with engaging holes 112a. In addition to 11
A pair of scissors 12, a plate 13, a rotary heat ray sensor storage unit 14, a support member 15, a control system printed circuit board 16, a power supply system printed circuit board 17, and a cover 18.
And a terminal cover 19.

The scissors fitting 12 is formed in a vertically long box shape having an opening on one side and is engaged with the pair of holding grooves 111b.
The support column 121 having a pair of engaging protrusions 121a at its lower end, and the support column 1 having upper and lower ends inserted through the upper wall and the bottom wall, respectively.
21 includes a tightening screw 122 that is rotatably held by the screw 21, and a sandwiching piece 123 that is screwed into the tightening screw 122. By rotating the tightening screw 122, the sandwiching piece 123 moves from the notch 121b and descends along the opening surface of the column 121. Therefore, the pair of engaging projections 121a of each scissors metal fitting 12 are engaged with the pair of holding grooves 111b of the flange portion 111, respectively, and each scissors metal fitting 12 is engaged.
Is removably attached to the body 11, and each scissors metal fitting 12
Then, the cylindrical portion 112 is inserted into a mounting hole formed in a ceiling board (not shown), and thereafter, the sandwiching piece 123 is lowered, so that the sandwiching piece 123 is respectively attached to the upper and lower surfaces of the ceiling board near the peripheral portion of the mounting hole. The lower surface of the tip end portion and the upper surface of the flange portion 111 contact or press contact with each other, whereby the body 11 is attached to the ceiling.

The plate 13 has a round hole 13a corresponding to the window hole 111a in the central portion, is engaged with the flange portion 111 and is held, and functions as a decorative cover.

The heat ray sensor storage portion 14 is a sensor 140 having a cylindrical shape and a square detection surface on the tip projecting surface.
(For example, a heat ray sensor including an infrared detection element such as a pyroelectric element) is housed inside (see FIG. 3), and the rotary frame 141, the wide-angle lens 10, the detection system printed board 143, and the holding frame 144. It is composed of and.

The rotary frame 141 is a box body having a circular opening edge portion, and is made of resin in a hemispherical shape having a shaft portion 141a at both ends. In addition, the outer peripheral portion of the opening edge of the rotary frame 141 is cut out to form a step structure,
An electric wire insertion hole 141b is formed near the bottom of the side surface (see FIG. 3).

The wide-angle lens 10 is a multifocal lens (Fresnel lens) formed in a dome shape with a light-transmissive (for example, milky white) resin or the like, and is provided on the front side of the rotary frame 141 and the detection system printed circuit board 143 (see FIG. 2). Then it will be placed on the lower side) to become the window. The specific structure of the wide-angle lens 10 will be described later.

The detection system printed circuit board 143 includes a sensor 14
The inside of the rotary frame 141 is a mounting board on which electric components such as 0 and a plurality of (six in FIG. 3) lead wires L1 are mounted on the front surface side, and the lead wires L1 are inserted into the wire insertion holes 141b. It is stored in and screwed.

The holding frame 144 is a cylinder having a circular opening edge, and its side surface is tapered so that its diameter decreases toward the front (downward in FIG. 2). Also, the holding frame 1
The inner peripheral portion of the opening edge portion on the rear side of 44 is notched, and the inner peripheral portion of the notched opening edge portion and the outer peripheral portion of the notched opening edge portion of the rotary frame 141 are fitted to each other. It is supposed to do.

The support member 15 includes a pressing member 151, a support rod 153 attached to the pressing member 151 via a spring 152,
It is composed of two screws 154 and is used for rotatably fixing the heat ray sensor storage portion 14 to the body 11. That is, each shaft portion 141a of the rotary frame 141 is connected to the window hole 1
11a is inserted into a guide groove 111c extending upward from the lower end side formed on the peripheral portion of 11a, and thereafter, using two screws 154, a holding metal fitting 151 to which a supporting rod 153 is attached via a spring 152 is attached to the body. If the screw 11 is screwed, the upper portion of the heat ray sensor storage portion 14 is elastically pressed by the support rod 153, and the heat ray sensor storage portion 14 is rotatably fixed to the body 11.

The control system printed circuit board 16 has a lead wire L1.
While being electrically connected to the detection system printed circuit board 143 via the, the power source system printed circuit board 17 is also electrically connected via a parallel cable (not shown).

The power supply system printed board 17 is a board 171.
And three pairs of terminal plates 172 having a U-shaped cross section mounted on this
And a pair of lock springs 173 held in the three pairs of terminal plates 172, and a button 174 interposed between the lock springs 173 of each pair.

Here, the sensor 140 can be applied to heat ray sensor-equipped automatic switches of various control modes, and such heat ray sensor-equipped automatic switches include, for example, a lighting fixture as a load in addition to the sensor. A changeover switch for switching lighting control to any mode, a volume control or selector switch for setting a predetermined time used in each mode, a constant voltage to obtain a constant voltage by rectifying AC voltage from a commercial power source, etc. A circuit and a microcomputer for performing various controls are provided.
Then, each of these parts corresponds to the detection system printed circuit board 14 described above.
3. Mounted on either the control system printed circuit board 16 or the power supply system printed circuit board 17. Further, depending on the type of the heat ray sensor-equipped automatic switch, an illuminance sensor, a dimming signal control unit, etc. may be further provided.

The cover 18 is formed in a box shape capable of closing the opening of the cylindrical portion 112, and the side wall portion of the cover 18 is provided with an engagement protrusion 18a which is fitted into the engagement hole of each engagement protrusion 112a. On the other hand, a wire insertion hole 18b is formed on one side of the upper surface so as to communicate between the lock spring 173 and the terminal plate 172 of each set, and a button 174 is communicated between the wire insertion holes 18b of each pair. The jig insertion hole 18c is formed.
Therefore, the control system printed circuit board 16 and the power supply system printed circuit board 17 are positioned on the heat ray sensor storage portion 14 rotatably fixed to the body 11 so that the engagement projections 18 are formed.
When a is fitted into the engagement hole of the corresponding engagement projection 112a, the opening of the cylindrical portion 112 is closed by the cover 18, and the control system printed circuit board 16 and the power system printed circuit board are provided in the body 11 and the cover 18. 17 will be stored. When the conductor wire of the electric wire is inserted into the electric wire insertion hole 18b, the conductor wire is elastically sandwiched between the terminal plate 172 of the communication destination and the lock spring 173 elastically contacting the terminal plate 172. Furthermore, if the tip of a flat-blade screwdriver is inserted into the jig insertion hole 18c, the button 174 of the communication destination is pressed and the lock spring 173 is pressed against, whereby the wire in which the conductor wire is elastically clamped can be pulled out. become. In the example of FIG. 2, the control system printed circuit board 16 is screwed to the body 11 side, and the power supply system printed circuit board 17 is screwed to the cover 18 side. Further, a terminal cover 19 is detachably attached to the cover 18 so as to cover each wire insertion hole 18b.

Here, the detailed structure of the wide-angle lens 10 will be described in detail. As shown in FIG.
The cylindrical portion 101 on which the sensor 140 is arranged on the axis, the tapered surface portion 102 that inclines inward from the front opening side of the cylindrical portion 101 along the axial front of the cylindrical portion 101, and the inner peripheral edge of the tapered surface portion 102. A collar portion 103 that extends inwardly from and a dome-shaped collective lens portion 104 that extends forward from the inner peripheral edge of the collar portion 103 are integrally formed.

The collective lens section 104 is composed of the cylindrical section 10.
A four-divided A lens arranged around the axis of 1 in a plane,
The 10-segment B lenses are provided around the outer peripheral edge of these A lenses along the axial rearward of the cylindrical portion 101 so as to be inclined outward, and the B lens of the outer peripheral edges of these B lenses.
01 is formed in a shape having a 16-divided C lens connected to the inner peripheral edge of the flange portion 103, which is circumferentially provided in a tapered surface shape that is inclined outward along the axial rearward direction. The A lens, the B lens, and the C lens are flat on the outside and convex on the inside.

On the inner surface of the cylindrical portion 101, as shown in FIGS. 1 (c) and 3, the opening edge portion on the rear side (lower side in the figure) of the cylindrical portion 101 is the opening edge portion of the rotary frame 141. A plurality of (4
Book) rib 10a is formed. In the figure, the rib 10 a is formed from the inner surface of the tapered surface portion 102.

As shown in FIG. 1A, a plurality of ribs 10b are formed on the outer surface of the cylindrical portion 101. The ribs 10b are provided one by one at the facing position, and two ribs 10b are provided at the facing position orthogonal to the facing position. Then, as shown in FIG.
When the ribs 10b are fitted in the corresponding grooves of the holding frame 144, the wide-angle lens 10 does not rotate about the axis with respect to the holding frame 144. It is like this. In addition, 10c in FIG. 3 is a minute flange part.

The ribs 10b of the wide-angle lens 10 having such a structure are fitted into the corresponding grooves of the holding frame 144 so that the cylindrical portion 101 and the tapered surface portion 102 of the wide-angle lens 10 are covered with the holding frame 144. Then, the holding frame 14
4, the inner peripheral portion of the notched opening edge portion, and the rotary frame 141
When the outer peripheral portion of the cutout opening edge portion is fitted to each other, the heat ray sensor storage portion 14 as shown in FIG. 3 is obtained.

In the example shown in FIG. 3, ribs 141c which come into contact with the opening edge of the wide-angle lens 10 are formed on the inner peripheral surface of the rotary frame 141 (four positions at 90 ° intervals). The detection response speed is 0.3 m / s for all A, B, and C lenses.
It is set to 1.0 m / s.

FIG. 4 (a) is a front view of a hood for a wide-angle lens mounted on the holding frame of the heat ray sensor storage part, FIG. 4 (b) is a partially cutaway side view of the hood, and FIG. 5 is a heat ray sensor storage part. FIG. 6 is an arrangement view of the detection area beam at 3.5 m ahead, and FIG. 6 is an explanatory view of the detection area of the heat ray sensor storage unit.

In various conventional automatic switch devices with heat ray sensors, a light-shielding hood may be attached to the holding frame in order to limit the detection area of the human body. The hood 20 shown in FIG. 4 is for the wide-angle lens of this embodiment, and is formed in a dome shape having a hole 20a in the center. Figure 4
In the example of (a), the hole 20a is set to have an opening diameter (φ12.2 mm) that shields the C lens of the wide-angle lens 10. In addition, 20b in FIG. 4 (b) is a locking protrusion that fits and locks in a groove (not shown) formed in the holding frame 144.

The detection area of the human body can be adjusted depending on whether or not the hood 20 is mounted in the heat ray sensor storage portion 14. The beam arrangement of 3.5 m ahead by the A lens, B lens and C lens is φ2.0 m, φ5.0 m and φ9.8 m, respectively, as shown in FIG.
It comes to come within the range of. As a result, as shown in FIG. 6, the human body detection area becomes φ7.0 m immediately below 2.5 m and φ9.8 m immediately below 3.5 m when the hood 20 is not attached. On the other hand, when the hood 20 is attached, the human body detection area is φ3.
Approximately φ5.0m just under 1m and 3.5m (φ4.
4m).

As described above, by preparing the hood 20, it is possible to provide a small variety of automatic switch devices with a heat ray sensor that can meet various needs.

By the way, the conventional automatic switch device with a heat ray sensor sometimes uses the wide-angle lens PA10 having the structure shown in FIG. This conventional wide-angle lens PA10
As shown in FIG. 8, in the collective lens unit PA104 having a lens diameter of 41.4 mm and a height of 6.6 mm, A to H
Eight types of lenses are provided. As described above, in the structure in which the collective lens portion PA104 is directly provided on the cylindrical portion PA101,
The size of the collective lens unit PA104 protruding downward of the automatic switch device with a heat ray sensor is inevitably large.

On the other hand, the collective lens portion 104 of the present embodiment has a collar portion 1 extending from the tapered surface portion 102.
No. 03, the lens diameter is φ16.5 mm and the height is 5.5 mm, as shown in FIG.

As described above, according to this embodiment, while maintaining the lens performance equivalent to that of the conventional wide-angle lens PA10,
A conventional wide-angle lens PA1 shown in FIG. 7 is provided with a collective lens portion 104 of the wide-angle lens 10 that projects outward from a window hole 111a of a housing including the body 11 and the cover 18.
It can be made smaller than the collective lens unit PA 104 of 0.

Further, on the inner surface of the cylindrical portion 101, a plurality of ribs 10a abutting the detection system printed circuit board 143 in a state where the rear side opening edge portion of the cylindrical portion 101 is close to the opening edge portion of the rotary frame 141. Is formed, the sensor 14
The positional accuracy between 0 and the wide-angle lens 10 is improved.

In the present embodiment, the wide-angle lens 10 is provided in the automatic switch parent device with the heat ray sensor, but the wide-angle lens of the present invention is not limited to this, and can be applied to various sensor devices. .

Further, as long as it is limited to the wide-angle lens 10 of this embodiment, it can be applied to, for example, an automatic switch parent device with a heat ray sensor shown in FIG. In the example of FIG. 8, the relay RL is mounted on the power supply system printed circuit board 17 for supplying / stopping the supply of electric power to a load such as a lighting fixture. Also, 1
As described above, circuits 6 and 17 are mounted with a circuit that meets the specifications of the automatic switch parent device with a heat ray sensor.

[0037]

As is apparent from the above, the invention according to claim 1 includes a housing having a window hole on one surface thereof, and a sensor having a detection surface directed outward from the window hole of the housing. A wide-angle lens used in a sensor device built in a housing, which is provided in front of a detection surface of the sensor and faces outward from a window hole of the housing, and a cylindrical portion in which the sensor is arranged on an axis, and the cylinder. Taper surface portion that inwardly inclines along the axial front of the cylindrical portion from the front opening side of the portion, a collar portion that extends inward from the inner peripheral edge of the tapered surface portion, and a portion that extends forward from the inner peripheral edge of the collar portion. The collective lens part is integrally formed with a dome-shaped collective lens part, and the collective lens part is provided with a plurality of first lens parts circumferentially provided around the axis of the cylindrical part and a plurality of the first lens parts. From the outer peripheral edge of the cylinder A plurality of second lens portions circumferentially provided in the shape of a tapered surface that inclines outward along the axial rear of the, and outward from the outer peripheral edges of the plurality of second lens portions along the axial rear of the cylindrical portion. Since it is formed in a shape having a plurality of third lens portions that are provided around the inclined taper surface and are connected to the inner peripheral edge of the flange portion, the collective lens portion that projects outward from the window hole of the housing, It can be made smaller than the conventional one.

According to a second aspect of the invention, in the wide-angle lens according to the first aspect, the sensor is mounted on a printed circuit board and housed in a box body having a circular opening edge portion, and Since a plurality of ribs that come into contact with the printed circuit board are formed on the inner surface in a state where the opening edge on the rear side of the cylindrical portion is close to the opening edge of the box body,
The positional accuracy between the sensor and the wide-angle lens is improved.

[Brief description of drawings]

1A is a front view of a wide-angle lens according to an embodiment of the present invention, FIG. 1B is a side view of the wide-angle lens, and FIG. 1C is a sectional view of the wide-angle lens.

FIG. 2 is an exploded perspective view of an automatic switch device with a heat ray sensor using the wide-angle lens.

3 is a partially cutaway side view of the heat ray sensor storage section in FIG. 2. FIG.

FIG. 4A is a front view of a hood for a wide-angle lens mounted on a holding frame of a heat ray sensor storage unit, and FIG. 4B is a partially cutaway side view of the hood.

FIG. 5 is a layout view of a detection area beam 3.5 m away from the heat ray sensor storage unit.

FIG. 6 is an explanatory diagram of a detection area of a heat ray sensor storage unit.

7A is a front view of a conventional wide-angle lens, and FIG. 7B is a partially cutaway side view of the same wide-angle lens.

FIG. 8 is an exploded perspective view of another automatic switch parent device with a heat ray sensor to which the wide-angle lens of the same embodiment can be applied.

[Explanation of symbols]

10 Wide-angle lens 101 cylindrical part 102 Tapered surface 103 brim 104 Collective lens part

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Claims (2)

[Claims] 1. A sensor device having a housing having a window hole on one surface thereof, the sensor having a detection surface facing outward from the window hole of the housing, which is used in a sensor device built in the housing, in front of the detection surface of the sensor. A wide-angle lens provided outward from a window hole of the housing, wherein a cylindrical portion in which the sensor is arranged on an axis, and an inner side along an axial front side of the cylindrical portion from an opening side in front of the cylindrical portion. And a dome-shaped collective lens part extending forward from the inner peripheral edge of the flange, and a taper surface portion inclined in a direction, a flange extending inward from the inner peripheral edge of the taper surface, The lens part includes a plurality of first lens parts circumferentially provided around the axis of the cylindrical part, and tilts outward from the outer peripheral edges of the plurality of first lens parts along the axial rear of the cylindrical part. Circumferentially tapered surface A plurality of second lens portions, and a plurality of second lens portions that are provided around the outer peripheral edges of the plurality of second lens portions in a tapered surface shape that is inclined outwardly along the axial rear of the cylindrical portion and that are connected to the inner peripheral edge of the collar portion. A wide-angle lens having a third lens portion. 2. The sensor is mounted on a printed circuit board and is housed in a box body having a circular opening edge portion, and an opening edge portion on a rear side of the cylindrical portion is provided on an inner surface of the cylindrical portion. The wide-angle lens according to claim 1, wherein a plurality of ribs that are in contact with the printed circuit board are formed in a state of being close to an opening edge portion of the box body.