JP3063414B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as a photoelectric switch, which is configured so that a volume for sensitivity adjustment or the like built in a main body case can be rotationally adjusted from outside.

[0002]

2. Description of the Related Art Conventionally, as the photoelectric switch, as shown in FIG. 8, a light emitting element 4 and a light receiving element 5 are mounted on a front end of a circuit board 2 provided with electronic components 3 on the front and back surfaces. The lens 7 is mounted on the front end of the holder 6 fitted externally to the light receiving element, and the pre-assembled substrate unit is inserted through the rear opening of the cylindrical main body case 1 having the filter 8 mounted on the front end. A cover member 9 is fitted into the rear opening end of the case 1, and a lead wire 10 a of a cord 10 penetrating the cover member 9 is connected to the circuit board 2 by soldering, and is provided on a rear upper surface of the circuit board 2 for sensitivity adjustment. A configuration is known in which a rotation adjustment shaft 11a of the volume 11 is engaged and linked to an operation shaft 13 mounted on the through hole 12 of the main body case 1 so that sensitivity can be adjusted from the outside.

[0003]

In the above conventional example, the circuit board 2 on which the volume 11 for sensitivity adjustment is mounted in advance.
And the circuit board 2 is inserted through the rear opening of the main body case 1.
The axis of the volume 11 does not coincide with the axis of the through hole 12 formed in the main body case 1 due to dimensional errors of the main body case 1, the lens 7, the circuit board 2, and the like. May become heavy, and sometimes the operation shaft 13 cannot be assembled.

An object of the present invention is to suppress the occurrence of misalignment between such a volume for sensitivity adjustment and a through hole formed in a main body case, and to enable an operation shaft to be appropriately assembled. I do.

[0005]

In order to achieve the above object, an electronic apparatus according to a first aspect of the present invention inserts and holds a circuit board on which electronic components are mounted in a cylindrical main body case, and further includes a circuit board. A lid fitted and connected to an opening end of the main body case in an electronic device in which a rotation adjusting shaft of an adjustment volume provided above is engaged and connected to an operation shaft mounted in a through hole of the main body case. A volume support portion for positioning and supporting the volume was formed inside the member.

The electronic device according to the second aspect of the present invention includes the first electronic device.
In the configuration of the present invention, a mounting hole for volume fitting is formed in the volume support portion, and small projections for positioning are provided at a plurality of circumferential positions on an inner peripheral surface of the mounting hole.

[0007]

According to the structure of the first aspect of the invention, since the volume is positioned and supported by the volume support provided on the lid member, an error between the axis of the volume and the axis of the through hole formed in the main body case is calculated as follows. It depends on the manufacturing error of the through hole with respect to the opening end of the main body case and the manufacturing error of the volume support with respect to the lid member.

In particular, according to the configuration of the second invention, the volume can be press-fitted into the mounting hole of the volume supporting portion with high positioning accuracy without rattling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a photoelectric switch will be described below with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention.

The basic structure and function of this photoelectric switch are the same as those of the conventional photoelectric switch. A plastic main body case 1 molded into a cylindrical shape, a circuit board 2 housed therein, and mounted on the front and back surfaces of the board. The electronic component 3, the light emitting element 4 and the light receiving element 5 attached in parallel to the front end of the substrate, the holder 6 for internally fitting and holding the light emitting element 4 and the light receiving element 5 in a predetermined posture at a predetermined interval, A plastic lens 7 fitted to the front end, a filter 8 for disturbing light absorption mounted and fixed to the front end of the main body case 1, internally fitted to the rear end of the main body case 1, and secured by a locking claw 9 a. The camera comprises a plastic lid member 9, a cord 10 penetratingly supported by the plastic cover member 9, and the like, irradiates light emitted from the light emitting element 4 forward through the lens 7 and the filter 8, and filters reflected light from the object. And the light receiving element through the lens 7 5
The light receiving element 5 outputs an output from the light receiving element 5 so that the presence of an object can be detected, and the rotation adjusting shaft 11a of the sensitivity adjusting volume 11 provided on the circuit board is provided. The through hole 1 of the main body case 1
The detection distance can be adjusted by engaging and connecting the operation shaft 13 mounted on the device 2 to adjust the sensitivity from the outside.

In the present invention, the volume 11 is positioned and supported as follows.

That is, the lid member 9 is formed in a shape that can be fitted into the main body case 1 only in a predetermined circumferential phase, and the step 9b formed on the outer periphery of the lid member 9 is By contacting the rear end 1a, the lid member 9 can be attached to the main body case 1 at a fixed position in the longitudinal direction thereof, and a rectangular block-shaped volume is formed on the inner surface of the lid member 9. The support part 14 is integrally formed.

At the center of the volume support portion 14, a mounting hole 15 having a diameter slightly larger than the outer diameter of the volume 11 is formed so as to penetrate vertically, and at three circumferential positions on the inner peripheral surface of the mounting hole 15, A vertical streak-like small projection 16 having a mountain-shaped cross section is formed. The dimension between the step 9b of the lid member 9 and the axis of the mounting hole 15 and the rear end 1a of the main body case 1 are set.
And the dimension from the axis to the axis of the through hole 12 is set to be the same.

Further, connecting pins 17 are provided on the left and right sides of the lower surface of the volume support portion 14. The connecting pins 17 are inserted into a pair of connecting holes 18 formed in the rear portion of the circuit board 2 and are caulked. Circuit board 2 with volume support 1
4 to be connected and fixed.

The present invention is configured as described above. When assembling a switch, first, the electronic components 3 and
After the circuit board 2 on which the light emitting element 4, the light receiving element 5, the holder 6, the lens 7, and the like are mounted is thermally caulked to the volume support part 14, the volume 11 is pressed into the mounting hole 15 of the volume support part 14, Terminal 1 on the lower surface of volume 11
1b and the lead wire 10a of the cord 10 are connected by soldering to the printed circuit of the circuit board 2, respectively. The board unit thus pre-assembled is inserted from the rear of the main body case 1 so that the lid member 9 is fitted and fixed in the opening of the main body case 1, and then the operation shaft 13 is attached to the through hole 12 of the main body case 1. It is engaged and connected to the rotation adjustment shaft 11a inside the case.

In this case, the small projection 16 is formed by press-fitting the volume 11 into the mounting hole 15 of the volume support portion 14.
When the group is slightly crushed, the volume 11 is correctly centered and assembled to the center of the mounting hole 15, and the step 9 b formed on the outer periphery of the lid member 9 contacts the rear end 1 a of the main body case 1. By inserting the board unit until it comes into contact, the assembly is performed so that the axis of the volume 11 and the axis of the through hole 12 coincide.

FIGS. 5 to 7 show a second embodiment of the present invention.

In this example, the cover member 9 fitted and fixed to the rear end of the main body case 1 is configured as a connector having a connection pin 19, and the connection pin 19 provided on the connector (cover member) 9 is connected to a lead. The support part 14 for supporting the volume, which is formed as a separate component, is connected and fixed to the end face of the connector 9 while being connected by soldering to a printed circuit of the circuit board 2 via a wire 20.

That is, the support portion 14 is positioned by the group of protrusions 21 provided on the end surface of the connector 9, and the support portion 14 is ultrasonically welded via the small ridges 22 provided on the end surface of the connector 9, In this case, too, the connector 9
The dimension from the step center 9a formed on the outer periphery of the main body 1 to the axis of the mounting hole 13 provided in the support portion 14 and the dimension from the rear end of the main body case 1 to the axis of the through hole 1a are set to be the same. ,
Accordingly, the axis of the volume 11 and the axis of the through hole 1a coincide with each other when the substrate unit is inserted.

Although not shown, the durability can be improved by bonding or screwing a reinforcing frame for preventing deformation of the circuit board 2 to the front or back surface of the circuit board 2.

[0022]

As is clear from the above description, the first embodiment
According to the invention, the volume is positioned via the volume support portion on the lid member that can be manufactured with high precision, and then this lid member is assembled to the main body case. The volume can be mounted without being affected by the volume connection error of the volume and the like, and the axial center error between the through hole of the main body case and the volume can be extremely reduced.

In particular, when the supporting portion provided on the lid member is configured as in the second aspect of the present invention, the volume can be supported by the supporting portion with high positional accuracy, and the through-hole of the main body case and the volume can be aligned with each other. Can be further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a photoelectric switch showing a first embodiment.

FIG. 2 is a cross-sectional plan view of the photoelectric switch.

FIG. 3 is an enlarged plan view of a volume support portion.

FIG. 4 is an exploded perspective view of the entire switch.

FIG. 5 is a vertical sectional side view of a photoelectric switch showing a second embodiment.

FIG. 6 is an exploded perspective view of a main part.

FIG. 7 is an exploded perspective view of the entire switch.

FIG. 8 is a vertical sectional side view of a conventional photoelectric switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Circuit board 9 Lid member 11 Volume 11a Rotation adjustment axis 12 Through hole 13 Operation axis 14 Volume support part 15 Mounting hole 16 Small projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/12 H01C 10/00 H01H 35/00 H01R 13/66

Claims (2)

(57) [Claims] A circuit board is inserted and held inside a cylindrical main body case, and a rotation adjustment shaft of an adjustment volume provided on the circuit board is connected to an operation shaft mounted in a through hole of the main body case. An electronic device, which is interlocked and connected, wherein a volume support portion for positioning and supporting the volume is formed inside a lid member fitted and connected to an opening end of the main body case. 2. The electronic device according to claim 1, wherein a mounting hole for fitting a volume is formed in the volume support portion, and small projections for positioning are provided at a plurality of circumferential positions on an inner peripheral surface of the mounting hole. machine.