JP3234324B2 - Reflector for sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector for a sensor, and more particularly to a reflector for a light receiving element.

[0002]

2. Description of the Related Art Conventionally, as a sensor for detecting an intruder,
Heat ray sensors and beam sensors are known. The heat ray sensor uses a pyroelectric element as a light receiving element, thereby detecting far infrared rays emitted from a human body or the like, and the beam sensor uses a photodiode or the like as a light receiving element.
Thus, the infrared light emitted from the light projector is directly detected or the reflected light is detected.

In a heat ray sensor or a beam sensor, a reflecting mirror having a quadratic curved surface is used as an optical system for forming a warning zone, and a light receiving element is arranged at or near the focal point. FIG. 2 shows an example of the configuration.

FIG. 2 is a perspective view schematically showing the appearance of a so-called double beam sensor light receiver which receives two infrared beams emitted from the light projector. The reflecting mirror 1 is formed of plastic. A predetermined metal is vapor-deposited on the inner surface over the entire surface, thereby forming the reflecting mirror surface 2. A light receiving element (not shown) is arranged at or near the focal position of the reflecting mirror surface 2. In addition,
In FIG. 2, reference numeral 4 denotes a mounting portion of the light receiving element.

When the entire inner surface of the reflecting mirror 1 is metallized, the side surface 3 of the reflecting mirror surface 2 is also metallized, and disturbance light is reflected by the side surface 3 in the direction of the light receiving element. In some cases, a signal indicating that there is an intruder may not be output despite the presence of the intruder. That is, even if the intruder interrupts the infrared beam from the projector, if disturbance light is received by the light receiving element by the reflecting surface of the side surface 3, the level of the signal output from the light receiving element indicates that there is no intruder. It is a level that can be judged.

Therefore, conventionally, a film-shaped anti-reflection member is provided in order to prevent disturbance light from being reflected on a surface which is not originally used as a reflecting mirror, such as the side surface 3 in FIG. Affixed with adhesive.

[0007]

However, each of the film-like antireflection members is bonded to the reflecting mirror body 1 by an adhesive.
It is extremely troublesome to attach the antireflection member to the side surface 3, and the antireflection member may stick out of the reflection mirror surface 2.

On the other hand, it is conceivable that metal is deposited only on the surface used as a reflecting mirror. However, the inner surface of the reflecting mirror body 1 is made to have a substantially mirror surface because a part of the inner surface is used as a reflecting mirror. As a result, disturbance light is reflected by the side surface 3 even when the side surface 3 is not metal-deposited.

Further, if the surface used as a reflecting mirror among the inner surfaces of the reflecting mirror body 1 is substantially a mirror surface, and the other surfaces not used as a reflecting mirror are rough surfaces, it is possible to diffusely reflect disturbance light. In this case, it is not necessary to attach an anti-reflection member, so that the above-mentioned problem can be solved. However, since the reflecting mirror body 1 is formed by a mold, if a rough surface is formed on the inner surface, the removal from the mold becomes poor. There is a problem that the efficiency of the manufacturing process is deteriorated.

The beam sensor has been described above.
The same applies to the heat ray sensor.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a reflecting mirror for a sensor to which an antireflection member can be easily and efficiently attached.

[0012]

In order to achieve the above object, a reflecting mirror for a sensor according to the present invention comprises a reflecting mirror surface forming one or more security zones, and a side surface of the reflecting mirror surface. A reflecting mirror for a sensor, comprising at least a reflecting mirror body having a metal film formed on the entire inner surface thereof, and a light receiving element disposed at or near a focal position of the reflecting mirror surface; Is provided with anti-reflection member locking means, and the anti-reflection member is locked to the anti-reflection member locking means. According to a second aspect of the present invention, in the sensor reflecting mirror according to the first aspect, the anti-reflection member locking means includes: a convex portion formed on an inner surface of the reflecting mirror body along a side surface of the reflecting mirror; And ribs formed in the vicinity of the side surfaces of

[0013]

The reflecting mirror for the sensor comprises a reflecting mirror, a light receiving element, an anti-reflection member locking means, and an anti-reflection member. The reflecting mirror body has at least a reflecting mirror surface forming one or more guard zones, and side surfaces of the reflecting mirror surface, and a metal film is formed on the entire inner surface. The light receiving element is arranged at or near the focal position of the reflecting mirror surface. An anti-reflection member locking means is provided on a side surface of the reflecting mirror, and the anti-reflection member is locked to the anti-reflection member locking means. Therefore, the antireflection member can prevent disturbance light from being reflected on the side surface of the reflecting mirror surface and incident on the light receiving element.

The anti-reflection member locking means is formed on the inner surface of the reflecting mirror body along the side surface of the reflecting mirror and near the side surface of the reflecting mirror surface. With the ribs, the anti-reflection member only needs to be locked to the anti-reflection member locking means, so that the operation is greatly facilitated as compared with the conventional case of sticking, and the efficiency is improved. The productivity can be improved.

[0015]

An embodiment will be described below with reference to FIG. In the following embodiments, a case will be described in which the present invention is applied to a light receiver of a double beam sensor. However, it goes without saying that the present invention can be applied not only to a beam sensor but also to a hot-wire sensor.

In FIG. 1, FIG. 1A is a perspective view showing the appearance, FIG. 1B is a front view, and FIG. 1C is a cross-sectional view taken along the line AA 'in FIG. 1B. Reference numeral 7 denotes a rib, and 8 denotes an antireflection member. Components equivalent to those shown in FIG. 2 are denoted by the same reference numerals as in FIG.

The inner surface of the reflecting mirror 1 is metal-deposited over the entire surface. A convex portion 5 is formed on the inner surface of the reflecting mirror body 1 along the side surface 3, thereby forming a guide 6 between the convex portion 5 and the side surface 3. A rib 7 is formed near the side surface 3 of the reflecting mirror surface 2. The distance between the rib 7 and the side surface 3 is set so that the antireflection member 8 can be locked well.

The projections 5 and the ribs 7 constitute locking means for the anti-reflection member 8. The anti-reflection member 8 is inserted along the guide 6 and is pushed between the rib 7 and the side surface 3. Thereby, the antireflection member 8 can be easily locked.

The anti-reflection member 8 can be made of cardboard, plastic, or the like.
It must have a function of favorably absorbing or diffusely reflecting disturbance light.

As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible. For example, the means for locking the anti-reflection member is not limited to the above embodiment,
It can be constituted by generally known appropriate locking means.

Further, in the above embodiment, the antireflection member 8 is not locked on the upper and lower surfaces of the reflecting mirror surface 2 in FIG. 1B, but the reflection from the surface is compared with the reflection from the side surface 3. This is because it is empirically clear that there is less. However, it goes without saying that the antireflection member 8 can be locked like the side surface 3 by forming a rib or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment in which a sensor reflecting mirror of the present invention is applied to a light receiver of a double beam sensor, FIG. 1A is a perspective view showing an appearance, FIG. 1B is a front view, FIG. FIG. 1C is a sectional view taken along line AA ′ of FIG. 1B.

FIG. 2 is a diagram showing a configuration example of a conventional sensor reflecting mirror.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reflective mirror body, 2 ... Reflective mirror surface, 3 ... Side surface, 4 ... Light receiving element mounting part, 5 ... Protrusion, 6 ... Guide, 7 ... Rib, 8 ...

Claims (2)

(57) [Claims] At least one reflecting mirror surface forming one or more guard zones, and a side surface of the reflecting mirror surface,
In addition, the inner surface is a reflecting mirror for a sensor including a reflecting mirror body in which a metal film is formed over the entire surface and a light receiving element disposed at or near a focal position of the reflecting mirror surface. A reflection mirror for a sensor, wherein anti-reflection member locking means is provided, and the anti-reflection member is locked to the anti-reflection member locking means. 2. The anti-reflection member locking means includes a projection formed on the inner surface of the reflector body along a side surface of the reflector, and a rib formed near the side surface of the reflector surface. The reflecting mirror for a sensor according to claim 1, wherein the reflecting mirror is used.