JPS6246285Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a photoelectric sensor equipped with a light emitter and a light receiver, and is a photoelectric sensor that is installed at a consumer, for example, in order to check the amount of electricity used by the consumer in detail over time. It is used to detect the rotational speed of a meter's disc.

In photoelectric sensors, positioning with respect to an object is generally important. Conventionally, this positioning has not been possible accurately.

An object of the present invention is to provide a photoelectric sensor that can be easily and accurately positioned with respect to an object to be detected.

In order to achieve this object, the present invention is characterized in that a position adjustment observation window is provided between the light projector and the light receiver, facing in the direction of light projection and passing through the photoelectric sensor.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

An embodiment of the present invention is shown in FIGS. 1 to 3. A mounting base 2 is attached to the upper part of the lower cover 1, and a front cover 3 and a front cover 3 are mounted on the mounting base 2.
An upper cover 4 is attached to cover the parts not covered by the above, that is, the left and right sides, the rear part, and the upper part. A light emitter 5 and a light receiver 6 are attached to the front cover 3 so as to be aligned on the same plane, facing a point a predetermined distance ahead. The emitter 5 is a light emitting diode (not shown), and the receiver 6 is a photodiode 7.
(Fig. 3), respectively.

A front part 8a of an observation window 8 for position adjustment is provided in the central part of the front cover 3 between the emitter 5 and the receiver 6, and an observation window 8 for position adjustment is also provided at the rear of the upper cover 4 and the window forming member 9. A rear portion 8b of the window 8 is provided. The observation window 8 for position adjustment has a front part 8a and a rear part 8b.
It is formed by a space within the upper cover 4 that connects both parts 8a and 8b, and passes through the photoelectric sensor in the direction of light projection. Transparent window covers 10 and 11 are attached to the front part 8a and the rear part 8b. The relative positions of the emitter 5, the receiver 6, and the observation window 8 for position adjustment are fixed in the photoelectric sensor,
There is an unchanging relationship. The window forming member 9 is provided with a light emitting diode 12 slightly peeking out from the rear part 8b of the observation window 8 for position adjustment, and the light emitting diode 12 is connected to the output terminal of the light receiver 6 via an amplifier or the like. By inputting a signal corresponding to the magnitude of the output, the light receiver 6 emits light when it receives a predetermined amount of light.

13 is a lead wire, 14 is a knob for coarse sensitivity adjustment,
15 is a sensitivity fine adjustment knob, 16 and 17 are variable resistors for sensitivity adjustment, 18 is a printed board support, 19 is a printed board, 20 is a printed board spacer, 21 is a printed board holder, 22 is a cover fixing nut, 23
24 is an external output line, and 24 is a screw hole into which a wing bolt for attachment is screwed.

For example, when detecting the rotational speed of a disc of a watt-hour meter, the peripheral edge of the disc 25 is located at the point where the optical axes of the emitter 5 and receiver 6 intersect, as shown in FIG. The photoelectric sensor must be positioned accordingly. To do this, a beam of light is directed from the projector 5 onto the disc 25, and the disc 25 is positioned at the center of the position adjustment observation window 8 as shown in FIG. A reflected light spot 26 exists on the disk 25 and the light emitting diode 1
The disk 25 is arranged so that the brightness of the disk 25 is the highest (that is, the amount of reflected light that enters the light receiver 6 is the largest).
move the position of the photoelectric sensor relative to the periphery of the
Adjust the position. If the photoelectric sensor is fixed at the position adjusted in this way, positioning can be performed accurately. The photoelectric sensor is attached to the watt-hour meter or the meter box of the watt-hour meter by a sensor mounting device (not shown), and this sensor mounting device allows you to adjust the overall position (including orientation) of the photoelectric sensor by loosening screws. After adjusting the position, the photoelectric sensor is fixed in the adjusted position by tightening the screw.

The photoelectric sensor positioned in this manner detects a decrease in reflected light when the light beam hits the index 27 of the disk 25, and outputs one pulse. Therefore, one pulse is output for each rotation of the disk 25.

Depending on the manufacturer, there is a type of wattmeter that has a braking magnet located in the front, and in this type, the light rays cannot be directed directly in front of the disc 25 because it is obstructed by the braking magnet. However, since the photoelectric sensor in the illustrated embodiment is cylindrical, even if it is positioned laterally from the front, the mounting space in the front and rear direction remains the same. This is advantageous when the space in front of the power meter is narrow, such as in a power meter installed in an outdoor Kew Building.

The photoelectric sensor of the present invention is used not only to detect the rotational speed of the disc of a watt-hour meter, but also to detect the position of the pointer of various meters.

As explained above, according to the present invention, a position adjustment observation window is provided between the emitter and the receiver, facing in the direction of light emission and passing through the photoelectric sensor. The state can be visually observed through the observation window for position adjustment, thereby making it possible to easily and accurately position the object to be detected.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is also a longitudinal sectional view, Figure 3 is a partially sectional plan view, Figure 4 is a plan view showing the arrangement of the electric energy meter disk, emitter, and receiver, and Figure 5 is an observation window for position adjustment. FIG. 3 is a front view showing the field of view. 5... Emitter, 6... Light receiver, 8... Position adjustment window.

Claims (1)

[Scope of utility model registration request] In a photoelectric sensor in which a light emitter and a light receiver are installed so that they are aligned on the same plane and facing a point in front of a predetermined distance, a sensor is installed between the light emitter and the receiver, pointing in the light emission direction and penetrating the photoelectric sensor. A photoelectric sensor characterized by having an observation window for position adjustment.