JP2605592Y2 - Reflective photoelectric switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of detecting a near-infrared ray emitted from a detection object which has entered a detection area and detecting a change in the near-infrared ray, for example, as a visitor sensor or security sensor for an automatic door. The present invention relates to a reflective photoelectric switch that can be used.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view for explaining the principle of a conventional reflection type photoelectric switch. In FIG. 4, the reflection type photoelectric switch is mounted, for example, above a doorway of a building (not shown), and detects a person entering and exiting the building to open and close the door. The reflection type photoelectric switch includes a light emitting element 41 composed of a light emitting diode that emits near infrared light, a reflecting mirror 42 that emits near infrared light emitted from the light emitting element 41 to a desired area, It comprises a transmitting front lens 43 and a light receiving element 46 composed of a photodiode for receiving near infrared rays reflected from persons entering and exiting the building via the front lens 43 and the reflecting mirror 42 '. The front lens 43 includes a flat part 45 formed between the prisms 44 and 44 'that can project and receive the near infrared rays.

A person approaching an entrance of a building receives, for example, a near-infrared beam emitted from above.
The near-infrared beam is reflected by a person, and is captured by the light receiving element 46 as a change in the amount of the reflected near-infrared light. That is, the reflection type photoelectric switch is
A person entering or exiting the building is detected by a change in the current of the light receiving element 46. Thereafter, the detection signal from the light receiving element 46 becomes a drive signal for opening and closing the door. The above-mentioned reflection type photoelectric switch can be surely detected because there is a change in the reflected near-infrared ray unless a person who enters or exits the building is stopped for a long time.

[0004]

However, when there is movement of a person or the like who does not intend to enter or leave the building near the entrance of the building, changes in near-infrared rays reflected from these persons are caused by the light receiving element of the reflection type photoelectric switch. Is detected by That is, the door is opened and closed by the movement of a person who is not intended to enter and exit. For example, when a register or a showcase of a popular product is placed near an entrance, a reflective photoelectric switch needs to limit near-infrared rays reflected from a clerk or customer. In addition, the arrangement of the showcase, the register, and the like in the building sometimes changes, but it is necessary to change the detection range of the reflective photoelectric switch each time. There are too many types of reflective photoelectric switches if they are designed with different detection ranges. Or,
There is a problem that it is uneconomical to replace the reflection type photoelectric switch every time it is rearranged in a building.

Therefore, as shown in FIG. 4, for example, when it is desired to project near infrared rays on only one side, a shielding seal 47 is attached to one side of the front lens 43 so as not to detect unnecessary near infrared rays. By doing so, the detection area was adjusted. However, if a shielding seal 47 that does not transmit near-infrared rays is attached to the front lens 43, the shielding seal 47 will be seen by a person entering or exiting the building, which is aesthetically problematic. In addition, the detection area of the shielding seal 47 greatly changes depending on the area to be attached to the front lens 43, and it is difficult to set a desired detection area.

[0006] In order to solve the above problems, an object of the present invention is to provide a reflection type photoelectric switch capable of coping with many different light receiving ranges from one type.

[0007]

Means for Solving the Problems (First Invention) In order to achieve the above object, the reflection type photoelectric switch of the present invention emits near-infrared light to a detection area (11, 13). And near-infrared light receiving means (13, 12) for detecting a change in near-infrared light reflected from the detection area, and projecting near-infrared light emitted from the light emitting means (11, 13) to a desired range. A condenser lens (14, 14 ') for receiving a change in near-infrared light reflected from the detection area by light-receiving means (13, 12); Optical part (1
6), said condenser lens (14, 14 ') to insert the insertion opening (20), said condenser lens (14, 14' as well as guiding the detachable), the condenser lens (14, 1
4 ') from the insertion slot (20),
Condensing lenses (14, 14 ') are inserted through the insertion port (20)
It is composed of a guide (21) which is inclined so as not to fall, and a housing (15) in which a guide is formed.

[0008]

[0009]

[Operation] (First Invention) Near-infrared rays emitted to a desired range from the light emitting means are reflected from the detection area at the entrance of the building. A change in near-infrared light that has entered the detection area, for example, reflected from a person, is detected by the light receiving unit. A condensing lens that emits near-infrared light emitted from the light emitting means to a desired range.
Tilt's is that is inserted from the reflective photoelectric insertion opening molded into the housing of the switch, which also molded into the housing
Attached detachably along the guide that is doing . Therefore, the reflection type photoelectric switch of the present invention is most suitable for the situation near the entrance of the building by arranging various types of condensing lenses having prisms having different angles, for example, so as to detect a desired detection range. A suitable detection range can be set.

The present invention simply tilts the condenser lens .
The fixing means is not
Since it is important, it is easier than the effort of attaching a shielding seal,
A reflective photoelectric switch having a desired detection range can be obtained. Also, instead of the shielding seal, insert the shielding plate from the insertion slot
By simply inserting the switch along the inclined guide, the detection range of the reflective photoelectric switch can be freely changed. Further, in the reflection type photoelectric switch of the present invention, it is easy to change the condenser lens or insert the shielding plate, and since the shielding plate is not exposed on the surface, there is no aesthetic problem. Further, the near-infrared transmitting portion of the housing can be freely designed without having a flat transmitting portion as in the related art.

[0011] guide attaching a condenser lens, a reflection type photoelectric switch, in a state where for example attached to the upper sidewall of the doorway, downward from the insertion opening provided in the housing (heavy
(In a direction in which it does not fall by force) . Therefore, since the condenser lens is inserted obliquely downward from the insertion port without opposing gravity,
There is no need to provide any special fixing means between the guide and the condenser lens . The reflective photoelectric switch of the present invention as described above has a simple structure and detachable structure because no special fixing means is provided even though the condenser lens is made detachable.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view for explaining one embodiment of the present invention, and is a conceptual sectional view of a reflection type photoelectric switch viewed from above. FIG. 2 is a schematic cross-sectional view of one embodiment of the present invention, in which a reflection type photoelectric switch is mounted and one side is viewed from the center. FIG. 3 is a schematic perspective view of a reflection type photoelectric switch according to an embodiment of the present invention. 1 to 3, a reflective photoelectric switch 10 includes a light projecting element 11 that emits near infrared rays, a reflecting mirror 13 that projects near infrared rays emitted from the light projecting element 11 in a desired direction, and, for example, A reflecting mirror 13 'for reflecting near-infrared light reflected from a person or the like, a light-receiving element 12 for receiving near-infrared light reflected by the reflecting mirror 13', and a light-receiving or light-receiving element 12 for projecting near infrared light to a desired detection area Lenses 14, 14 'for receiving light at
And a housing 15 of the reflection type photoelectric switch 10.

The housing 15 of the reflection type photoelectric switch 10
As shown in FIG. 2 and FIG. 3, a front lens 16 transmitting near-infrared rays and a base 17 having a mounting portion (not shown) for mounting on a side wall of an entrance or the like.
And a mounting base 18 mounted on the base 17 for mounting the light projecting element 11, the light receiving element 12, and the reflecting mirrors 13 and 13 'made of, for example, hemispherical concave mirrors, and a wall surface 19 of the housing 15. And an insertion port 2 for inserting the condenser lenses 14, 14 '.
And a guide 21 provided on a part of the wall surface 19 of the housing 15 to detachably attach the condenser lenses 14 and 14 '.

Condensing lenses 14, 1 for condensing near infrared rays
4 'is provided with, for example, a prism 22 formed to obtain a desired detection area, and a support projection 23 to be inserted and attached along a guide 21 provided in the housing 15. The guide 21 is provided with a groove 24 conforming to the shape of the support projection 23 of the condenser lenses 14 and 14 '. The condenser lenses 14 and 14 ′ are
One supports one of them. Therefore, if the shape of the guide groove 24 is, for example, a dovetail groove or an L-shaped groove, it is convenient even in the case of vibration. Further, the condenser lens 14 is provided with many types having different angles of the prism 22, and a desired detection range can be obtained by selecting these. For example, the condenser lens 14 can obtain a left-right asymmetric detection area by attaching the prisms 22 having different angles to the left and right. Further, as the condenser lens 14, a lens can be used other than the prism plate as shown in FIGS.

Further, as can be seen from FIG.
Is tilted downward from the insertion slot 20 with the reflective photoelectric switch 10 attached. In the mounting state shown in FIG. 2, when the condenser lens 14 is inserted into the guide 21 inclined downward, the condenser lens 14 does not fall off against the gravity of the condenser lens 14. Therefore, the condensing lenses 14 and 14 'do not require any special fixing means for their attachment and detachment, and also take no labor for attachment and detachment. Further, the guides 21 are provided on both side walls of the housing 15, for example, and as shown in FIG.
Is formed just before reaching the base 17. The condenser lenses 14 and 14 'have the above-mentioned structure because they do not need to relate to the mounting base 18 to which the light projecting element 11 and the light receiving element 12 are mounted. The condensing lenses 14 and 14 ′ are provided with grooves 24 of the guide 21 as cantilever beams.
Therefore, the space between the condenser lens 14 and the condenser lens 14 'is opened, and the beam in the straight direction is passed from this portion.

The reflection type photoelectric switch 10 as described above is
In order to obtain a desired detection area, the condenser lenses 14, 14 '
To guide 21 from insertion port 20 of housing 15.
Insert along. And this reflection type photoelectric switch 1
0 is attached to the entrance of the building in the direction shown in FIG. The near-infrared ray emitted from the light projecting element 11
The light is radiated to the detection area via the third lens 3 and the condenser lenses 14 and 14 ′. If any person has passed the detection area, the reflection of the near-infrared ray changes due to the heat of the person. The amount of change of the near-infrared ray is received by the light receiving element 12 via the condenser lenses 14 and 14 'and the reflecting mirror 13. Therefore,
The reflection type photoelectric switch 10 sends a change in current of the light receiving element 12 as a human detection signal to, for example, a drive unit that drives a door, and opens and closes the door based on this signal.

Although the embodiment of the present invention has been described in detail, the present invention is not limited to the embodiment. And
Various design changes can be made without departing from the present invention described in the utility model registration claims. For example, a publicly known or well-known device can be used as the light emitting element, the light receiving element, the control device of the reflection type photoelectric switch, and the like. The shapes of the reflecting mirror, the prism of the condenser lens, the guide, the housing, and the like can be changed in design other than those in the embodiment. Further, in the embodiment, the reflection type photoelectric switch for detecting a person approaching the entrance of the building has been described. However, the present invention is not limited to the person and may be any moving object. Further, although the power supply circuit and control circuit of the reflection type photoelectric switch in the embodiment are not shown, for example, Japanese Utility Model Laid-Open No. 58-78538, Japanese Utility Model Publication No.
Alternatively, the one described in Japanese Utility Model Publication No. 2-36199 can be used.

[0018]

According to the present invention, since the condenser lens can be detachably mounted simply by inserting the condenser lens into the inclined guide provided in the housing, different condenser lenses can be exchanged.
As a result, the detection range can be easily changed. Further, the structure for detachably attaching the condenser lens is such that the condenser lens does not fall in a normal attachment state when the reflection type photoelectric switch is attached.
There is a guide with an inclined shape
This eliminates the need for special fixing means. According to the present invention,
Condenser lens guides the near-infrared transmitting part of the housing
Because provided through, this portion can be represented by the free straight or curved, it may be esthetically excellent reflection-type photoelectric switch.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a reflection type photoelectric switch viewed from above, for explaining one embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of one embodiment of the present invention, with a reflective photoelectric switch attached, as viewed from one side from the center.

FIG. 3 is a schematic perspective view of the reflection type photoelectric switch according to the embodiment of the present invention;

FIG. 4 is a cross-sectional view for explaining the principle of a conventional reflection type photoelectric switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Reflection type photoelectric switch 11 ... Light projection element 12 ... Light receiving element 13 ... Reflecting mirror 14, 14 '... Condensing lens 15 ... Housing 16 ... Front lens 17. ··· Base 18 ··· Mounting base 19 ··· Wall surface 20 ·····················································································

Claims (1)

(57) [Scope of request for utility model registration] 1. A reflection type photoelectric switch capable of covering a desired detection area, a light projecting means for projecting near infrared rays to the detection area, and detecting a change in near infrared rays reflected from the detection area. a near-infrared light receiving means and for projecting near-infrared rays emitted from the light projecting means in a desired range, a condenser lens for receiving the near infrared change in reflected from the detection region to the light receiving means, each Attaching the means, a light- transmitting portion through which the near-infrared ray passes, an insertion port for inserting the condenser lens ,
Together detachably guiding the condenser lens, the light converging lens
With the lens inserted through the insertion port, the condenser lens
A reflection type photoelectric switch, comprising: a housing formed with a guide having an inclination so as not to fall from the insertion opening .