JP2000213911A - Non-contact detection element mounting device - Google Patents

Abstract

(57) An object of the present invention is to provide a position detecting device which solders lead terminals of a pair of non-contact detection elements to a substrate and detects a position of a detection object passing between the pair of detection elements. The position detection function of the contactless detection element is maintained by preventing the terminal from being bent or twisted. SOLUTION: A U-shaped element holder 20 is formed by resin molding.
To form a first fitting portion 30 and a second fitting portion 31 that respectively fit and hold the pair of elements in the pair of facing portions of the element holder 20. An opening is formed in the element holder 20 so that the detection surfaces of the pair of non-contact type detection elements 6 and 7 face each other. Further, the element holder 20 and the substrate 2 are provided with the opening of the element holder 20. Guide pin 2 for positioning the bottom surface and the substrate 2 by fitting each other
2 and a locking pin 23 for locking the element holder 20 to the substrate 2 by engagement with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of non-contact type detecting elements which are arranged on both sides of an object to detect a linear movement or a rotational movement of the object. The present invention also relates to a device for mounting a non-contact type detection element configured to protect the non-contact type detection element from deformation after mounting the substrate.

[0002]

2. Description of the Related Art In general, a pair of detection elements (magnetic elements or a pair of optical elements) are arranged on both sides of a detected object in order to linearly move the object to be rotated or to detect the rotation angle of the detected object. There is provided a position detecting device that detects slits or magnetic portions formed at predetermined intervals in a detection target body by the pair of detection elements, inputs the slits or magnetic portions to a controller, and converts the distance or angle into a distance and an angle by an operation of the controller. Devices incorporating this type of position detection device include, for example, a mouse as a pointing device and a steering angle detection device.
FIG. 4 shows a rotation angle detection angle device 1 using a pair of an LED and a phototransistor as the pair of detection elements. As shown in the figure, a substrate 2 is formed of a laminated printed circuit board, and elements such as a resistor 4 and an LSI (large-scale integrated circuit) 5 are soldered to a rotation angle detection circuit 3 printed on the surface of the substrate 2. LED6, phototransistor 7
Of the LED 6 and the lead terminal 1 of the phototransistor 7, respectively.
1, 11, 11 are inserted and soldered, and are electrically connected to the rotation angle detection circuit 3.

[0003]

As described above, a pair of detecting elements (LED6, phototransistor 7) are provided on the substrate 2.
) Is directly soldered to form a position detecting device, so that the trouble of connecting the non-contact type detecting element and the position detecting circuit (rotation angle detecting circuit 3) can be saved, and the connection error can be eliminated. It becomes possible and can be incorporated into various devices as one component. In this case, as shown in FIG.
The size of the detection target 12 and the detection position of the slit 13 and the like differ depending on the device to be incorporated. In that case, the length of the lead terminals of the pair of detection elements must be set in accordance with the size of the detection target and the detection position,
If the length of the lead terminal is increased, the soldering process and management become complicated, and it cannot handle bending and twisting during transport and handling after soldering, and the normal function as a detection device There is no guarantee.

Therefore, in a position detecting device in which a pair of non-contact type detection elements are soldered to a substrate to form a position detection circuit, the non-contact type detection element is accurately positioned on the substrate and handled. Therefore, there arises a technical problem which can be solved in order to prevent the deformation of the non-contact type detection element and to prevent the deviation in positioning of the non-contact type detection elements, and an object of the present invention is to solve the problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and comprises a pair of sensors arranged on both sides of an object to detect the movement of the object by light or magnetism. The non-contact type detection element is integrally held on the substrate, and the lead terminal of each non-contact type detection element is inserted into the lead terminal insertion hole of the substrate, and the detection element is electrically connected to the position detection circuit of the substrate by soldering. In the device, a U-shaped element holder is formed by resin molding, and a first fitting part and a second fitting part for fitting and holding the pair of elements in a pair of opposed parts of the element holder, respectively. And forming a first open portion and a second open portion in which the detection surfaces of the pair of detection elements face each other and face each other. Further, the first open portion and the second open portion are fitted to the bottom surface of the element holder and the substrate. Guide pins that are positioned by It is to provide a mounting device for non-contact detection element integrally molded and a locking pin for locking the element holder to the substrate by engagement.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a rotation angle detecting device for detecting the rotation angle of an object to be detected by an optical element will be described below in detail with reference to FIGS. . It is to be noted that the same components as those of the related art are denoted by the same reference numerals.

(First Embodiment) FIG. 1 shows an embodiment in which the LED 6 and the phototransistor 7 are mounted on an element holder, and the LED 6 and the phototransistor 7 are soldered after the substrate 2 is mounted. Is shown. As shown in FIGS. 1A and 1B, the rotation angle detection circuit 3 is printed and wired in advance on the substrate 2 for detecting the rotation angle.
0, 10 and the lead terminals 11 of the phototransistor 7,
11, 11 are inserted into the corresponding terminal insertion holes 8, 8, 9, 9 and soldered, and electric and electronic components (resistors 4, LSI 5, diodes, etc.) required for the rotation angle detection circuit 3.
When the soldering is completed, the rotation angle detection circuit 3 functions normally. The element holder 2
Reference numeral 0 denotes a resin molded body formed in a U-shape when viewed from above, and a plurality of guide pins 22 and a plurality of locking pins 23 are provided at appropriate positions on the bottom surface 21 of the element holder 20.
Are provided at intervals. The guide pins 22 ...
When inserted into the guide holes 24 pre-drilled in the board 2, the mounting position of the element holder 20 with respect to the board 2 is determined, and the locking pins 23 When inserted into the stop hole 25, the claw 26 at the tip end,
The element holder 20 is integrated with the substrate 2 by locking the locking member 26 to the locking hole peripheral portion 27. In the present embodiment, the guide pin 22 is formed in a substantially circular cross section, and the locking pins 23 are formed in a substantially rectangular cross section. Each of the locking pins 23 has a straight slot 28 extending from the front end face to the rear end face side. Claws 26, 26
Is allowed to move radially inward, and can be inserted into the locking hole 25.

A pair of facing portions of the U-shaped element holder 20 form an LED mounting portion 29 and a phototransistor mounting portion 30, respectively. The upper portion of the facing portion between the LED mounting portion 29 and the phototransistor mounting portion 30 has an upper portion. U-shaped fitting portions 31 and 32 extending a predetermined length from the end face toward the bottom surface side are respectively formed, and engaging grooves 33 and 33 are provided on both inner sides of the fitting portions 31 and 32 along the vertical direction. Have been. The engagement grooves 33, 33 respectively fit a pair of rails 34, 34 projecting outward from both sides of the LED 6 and the phototransistor 7 from the upper end to the lower end of the fitting portions 31, 32, respectively. The fitting portions 31 and 32 are formed substantially corresponding to the outer shapes of the LED 6 and the phototransistor 7, respectively.
When the LED 6 and the phototransistor 7 are inserted from above, respectively, a predetermined pressing force is applied to the side surface and the back surface of the LED 6 and the phototransistor 7 to restrict the detachment. Then, fitting portions 31 and 32 for seating the LED 6 and the phototransistor 7 and setting them at a specified height are provided.
Are connected to the lead terminals 1 of the LED 6 respectively.
0, 10, lead terminals 11, 1 of phototransistor 7
Openings 37 and 38 for inserting the first and the first 11 are provided.

Next, the LED 6,
A procedure for attaching the phototransistor 7 and attaching it to the substrate 2 will be described.

The lead terminals 10, 10 of the LED 6 and the lead terminals 11, 11, 11 of the phototransistor 7 are L
It faces the openings 37 and 38 of the ED mounting portion 29 and the phototransistor mounting portion 30, and furthermore, a pair of rail portions 3 on both sides.
4 and 34 are fitted to the respective fitting portions 31 and 32 so as to face the corresponding engaging grooves 33 and 33, respectively. The lower surfaces of the LED 6 and the phototransistor 7 are connected to the bottom portions 36 and 37 of the respective fitting portions 31 and 32.
, Each lead terminal 10, 1 of LED6
0, lead terminals 11, 11, 1 of phototransistor 7
The distal end of the projection 1 projects forward from the distal ends of the guide pin 22 and the locking pin 23 as appropriate.

Next, lead terminals 10 and 10 of LED 6 and lead terminals 11 and 11 of phototransistor 7 will be described.
To the corresponding lead terminal insertion holes 8, 8,.
At the same time as inserting the guide pins 22 into the corresponding guide holes 24 and the lock holes 25, respectively.

At this time, a wedge force is generated between the upset 28 of the locking pin 23 and the tapered surface of the tip of the claw 26,
Due to this wedge force, the locking pin 23 moves radially inward by the width of the slot 28 and the restriction of the claw 26 with respect to the locking hole 25 is released. With this release, the guide pins 22 ...
Guide holes 24 and locking holes 2 corresponding to the locking pins 23.
5 is inserted. When the lower surface 21 of the element holder 20 comes into contact with the upper surface of the substrate 2 by insertion, the stopping force of the inner surfaces of the locking holes 25 with respect to the claws 26 is released, and the claws 26 are stored when the locking pins 23 are inserted. It moves radially outward due to the resilient force, and engages with the locking hole peripheral edge 27. When the element holder 20 is fixed to the substrate 2, all bending and buckling loads are supported by the element holder 20 and do not act on the LED 6 and the phototransistor 7. For this reason, the LED 6 and the phototransistor 7 can be bent and protected from a buckling load. After the element holder 20 is fixed to the substrate 2 by the locking pins 23, the respective terminal insertion holes 8, 8, 9, 9 and the respective lead terminals 10, 10, 11,.
A melted solder is supplied between the first and the second, and the two are electrically connected. The fitting portions 31 and 32 fit the LED 6 and the phototransistor 7 and form the fitting portions 31 and 32 in a U-shape to directly connect the light emitting surface (detection surface) and the light receiving surface (detection surface). Since the open portions that face each other are formed, the rotation angle with respect to the rotating disk (detected body) 12 is accurately detected.

(Second Embodiment) FIG.
6, there is shown another embodiment in which the phototransistor 7 is inserted from below and held in the element holder. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 2A and 2B, like the first embodiment, the element holder 41 is formed in a U-shaped cross section when viewed from above. A box-shaped LED fitting part 44 and a phototransistor fitting part 45 that open downward are formed on the upper part of the fitting part 43, and are engaged for fitting the rail part 34 to the inner surface of each fitting part 44. A groove 33 is formed. Of course, the LED fitting portion 44 is formed so as to fit the LED 6 and the phototransistor 7 from below and hold them in a predetermined fitting. In addition, the LED mounting portion 42 and the phototransistor mounting portion 43 have an LED fitting portion 44 and a lower portion of the phototransistor mounting portion 43 and the lead terminal 1.
Support portions 46 and 47 protruding to support the LED 6 and the phototransistor 7 from below are provided at corresponding portions between the leads 0, 10, 11, 11, and 11.
Further, between the LED mounting portion 44 and the connecting portion 48 of the element holder 41 and between the phototransistor mounting portion 43 and the connecting portion 48, from the bottom surface of the element holder 41 to the fitting portions 43 and 44. Slits 51, 51 extending linearly
The slits 51, 51 allow the LED mounting part 44 and the phototransistor mounting part 45 to be elastically opened. That is, the fitting portions 43, 4
In order to mount the LED 6 and the phototransistor 7 between the support member 4 and the supporting portions 46 and 47, respectively, the LED mounting portion 44 and the phototransistor mounting portion 45 are opened outward to temporarily attach the supporting portions 46 and 47 to the respective supporting portions 46 and 47. On the other hand, each fitting portion 43, 44
Move to the outside of the LED 6 and the phototransistor 7
After the fitting, the supporting portions 46 and 47 are moved toward the lower surfaces of the LED 6 and the phototransistor 7 by the accumulated elastic force. LED on the ceiling surface of the fitting parts 43 and 44
6. The phototransistor 7 is configured to be sandwiched in the vertical direction, thereby enhancing the integration of the element holder 41 with the LED 6 and the phototransistor 7. In this embodiment, the upper portions of the support portions 46 and 47 and the lower portions of the LED fitting portion 44 and the phototransistor fitting portion 45 are opened, and the detection surfaces of the LED 6 and the phototransistor 7 are respectively opened. It constitutes an opening for direct confrontation.

Further, other operations in this embodiment are as follows:
The effect, that is, the protection function of the element holder 41 for the LED 6 and the phototransistor 7 is the same as that of the embodiment.

FIG. 3 shows a preferred embodiment in which the phototransistor mounting portion 30 described in the first embodiment and the LED mounting portion 42 described in the second embodiment are formed on both sides of the connecting portion 48. An example is shown.

In this example, since the number of lead terminals of the phototransistor 7 is 3 and the number of lead terminals of the LED 6 is 2,
For the LED mounting portion 42, the support portion 46, the L
An ED fitting portion 44 and a slit 51 are formed, and a structure in which the ED fitting portion 44 and the slit 51 are fitted into the phototransistor mounting portion 30 from above is employed. For the element holder 52, as shown in the figure, the connecting part 47, the LED mounting part 42, and the photo-transistor mounting part 30 are provided on substantially the bottom of the central part.
The guide pin 22 and the locking pin 23 are formed. In addition, a cutout (not shown) for positioning a rotary disk (not shown) of the rotary encoder is formed between the LED 6 and the phototransistor 7 on the substrate 2, and the guide is formed by surrounding the escape portion. The holes 24 and the locking holes 25 are formed.

As described above, when the LED 6 is mounted on the element holder 52, the LED mounting portion 42 is flexed outward with a finger, and the head of the LED 6 is connected to the fitting portion 4 in this state.
4 from below.

Thereafter, when the spreading force by the finger is released, the support portion 46 is landed on the bottom surface of the LED 6 from below by the elastic restoring force of the locking pin 23, and the LED 6 is clamped without play. After this, LE is handled as usual.
D6, deformation of each lead terminal 10, 10, 11, 11, 11 of the lead terminal of the phototransistor 7 was investigated.
By the protection of the element holder 52, each lead terminal 10, 1
No deformation of 0,11,11,11 is observed. Therefore,
Even if the slit 51 is formed, conveyance before soldering,
Depending on the handling, the lead terminals 10, 10, 11, 11, 1 of the lead terminals of the LED 6 and the phototransistor 7 may be used.
No deformation of 1 occurs.

Next, the fitting portion 32 of the phototransistor 7
The phototransistor 7 was inserted from above and fitted. A fixed frictional force is generated between the phototransistor 7 and the fitting portion 32, and the detachment is not recognized in normal handling. Thereafter, the guide pins 22 were inserted into the corresponding guide holes 24 of the substrate 2, and the locking pins 23 were inserted into the locking holes 25 to fix the element holder 52 to the substrate 2. Guide pin 2
2 and the guide of the guide hole 24, the lead terminals 10, 10, 11,
11 and 11 were inserted smoothly without deformation, and the locking pins 23 were smoothly locked in the locking holes 25. Even if normal handling is performed in this state, no elastic deformation of the element holder 52 and the substrate 2 is recognized.

Next, each lead terminal 1 is solder reflowed.
0, 10, 11, 11 and 11 were soldered, and the strength of the element holder 52 was confirmed by applying a pressing force from front to back, right and left, and up and down. The magnitude of the load was set to a level that would occur during normal handling. However, the horizontal support of the locking pins 23, the guide pins 22 and the vertical regulation of the claws 26 and the element holder 52 caused the substrate 2 Since the overall strength of the structure including the above is greatly improved, the bending of the element holder 52 is not visually recognized and the lead terminals 1
No deformation of 0, 10, 11, 11, 11 is observed. In addition, a predetermined driving power was supplied to the substrate 2 and a test for heat generation was performed. However, the deformation of the element holder 52 due to heat did not occur, and the optical axis of the LED 6 and the phototransistor 7 was kept constant. No deviation of the axis due to warpage was observed.

As described above, each of the lead terminals 10 and 1 is soldered by the element holder 52 before and after soldering.
0, 11, 11, and 11 are not deformed, and the mounting accuracy and workability are remarkably improved as compared with the conventional case. Therefore, it has become possible to greatly reduce the assembly cost.

In each of the above embodiments, the strength,
It is appropriate to form a rib on the outer surface of the element holder for heat dissipation. In the present embodiment, the LED 6 and the phototransistor 7
Has been described to configure the rotation angle detection device,
It is also possible to configure a rotation angle detection device using a pair of magnetic elements. In addition, by changing the formation positions of the guide pin and the locking pin, not only the rotation angle detection device but also a position detection that detects a linear movement amount. It may be configured as an apparatus, or may be applied to an apparatus that simply detects passing objects. Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

[0024]

According to the present invention, as described in detail in the above embodiment, a U-shaped element holder is formed by resin molding.
Forming a first fitting portion and a second fitting portion for fitting and holding the pair of non-contact type detection elements into a pair of facing portions of the element holder, respectively, and forming the pair of non-contact type detection devices; A first opening and a second opening are formed so that the detection surfaces of the elements face each other, and further, a guide pin positioned relative to the bottom surface of the element holder and the substrate by fitting to each other, and a relation between the guide pins and the guide pins. In some cases, a locking pin for locking the element holder is integrally formed with the substrate. Therefore, without affecting the arrangement of the non-contact detection elements,
The non-contact detection element can be handled without deformation, and the handling cost can be reduced as much as possible. Also, when soldering each non-contact type detection element to the board, the lead terminals of the non-contact type detection element are positioned accurately and without deformation with respect to the lead terminal insertion holes of the board, so that the workability of assembly and soldering is improved. Is significantly improved. Furthermore,
Since the element holder is supported and fixed to the substrate by the locking pin and the guide pin, there is no influence on the arrangement of the non-contact type detection elements after soldering, so that it can be handled as a component of various devices. Further, the length of the element holder and the lead terminal can be freely changed, and the strength can be freely improved by adjusting the wall pressure of the element holder, so that the element holder can be provided as a component corresponding to various devices. etc,
Indeed, it is an invention that exhibits a remarkable effect.

[0025]

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing a first embodiment of the present invention applied to a rotation angle detection device for detecting a rotation angle of a detection object by an optical element.

FIG. 2 is an explanatory perspective view showing a second embodiment of the present invention applied to a rotation angle detection device for detecting a rotation angle of a detection object by an optical element.

FIG. 3 is an explanatory perspective view showing a preferred embodiment of the present invention applied to a rotation angle detecting device for detecting a rotation angle of a detection object by an optical element.

FIG. 4 is a partially cutaway perspective view showing a conventional rotation angle detection device.

[Explanation of symbols]

 2 board 6 LED (non-contact type detection element) 7 phototransistor (non-contact type detection element) 20 element holder 22 guide pin 23 locking pin 30 fitting part (first fitting part) 31 fitting part (secondary part) 41) Element holder 44 LED fitting part (first fitting part) 45 Phototransistor fitting part (second fitting part) 52 Element holder

Continuing from the front page (72) Inventor Takayuki Togawa 14-14 Sakaemachi, Sano-shi, Tochigi Pref. Tochigi Mitsumi Co., Ltd. (72) Inventor Shuji Kobori 14-5, Sakae-cho, Sano-shi, Tochigi Pref. Reference) 2F063 AA02 AA35 CA21 DA01 DD03 EA01 GA00 GA79 ZA01 ZA08 2F065 AA02 AA39 DD16 FF02 GG07 HH15 JJ18 PP22 UU03

Claims (1)

[Claims] A pair of non-contact detection elements, which are arranged on both sides of a detection object and detect movement of the detection object by light or magnetism, are integrally held on a substrate, and each non-contact detection element is provided. The lead terminal of the detection element is inserted into the lead terminal insertion hole of the substrate, and is electrically connected to the position detection circuit of the substrate by soldering. A U-shaped element holder is formed by resin molding. Forming a first fitting portion and a second fitting portion for fitting and holding the pair of elements in the pair of facing portions of the holder, respectively, and causing the detection surfaces of the pair of detection elements to face each other. Forming a first open portion and a second open portion facing each other, and further engaging the element holder with the substrate by engagement with guide pins positioned by fitting the bottom surface of the element holder and the substrate with each other. Lock the locking pin Mounting device of a non-contact type detecting element, characterized in that molded.