JP3349343B2 - Photoelectric encoder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type photoelectric encoder.

[0002]

2. Description of the Related Art A rotary type photoelectric encoder used for detecting the rotational position of a rotating body (measured body) includes a rotating plate provided with a predetermined light transmission pattern and fixed to a rotating shaft, and a rotating plate. The light emitting device includes a light emitting element and a light receiving element that are opposed to each other with a rotating plate interposed therebetween so as to allow rotation. The light from the light emitting element is received by the light receiving element through the light transmission pattern of the rotating plate, and the rotational position of the rotating plate is detected based on the received light signal. This type of photoelectric encoder includes a base member, and a base portion side circuit board including one of a light emitting element and a light receiving element is attached to the base member. The non-base-side circuit board to which the other of the light-emitting element and the light-receiving element is mounted is disposed on the opposite side to the base-side circuit board with a space between the rotation plate and the rotation plate in the axial direction of the rotation axis. Have been. The non-base-part-side circuit board is attached to the ends of a plurality of pin-shaped members that stand upright in the vicinity of the outer periphery of the base member. The circuit of the base-side circuit board and the circuit of the non-base-side circuit board are electrically connected to each other using a wire harness using a flexible board. The conductor of the wire harness is connected to the electrodes of each circuit by soldering. Also, input / output connection cords are attached to only one of the circuit of the base part side circuit board and the non-base part side circuit board.

[0003]

However, when a wire harness is used as in the prior art, handling is inconvenient. In addition, in order to facilitate assembly, it is necessary to connect the base-side circuit board and the non-base-side circuit board. The spacing between them must be increased. Further, when the wire harness is connected by soldering, when a failure occurs in the final inspection, the substrate cannot be substantially replaced, and a problem occurs that the yield is deteriorated. Therefore, it has been considered to use a connector which can be easily connected and disconnected as an electrical connection means for connecting the circuit on the base portion side circuit board and the circuit on the non-base portion side circuit board. However, since the connector conducts electrical conduction by contact between terminals, when vibration generated by rotation of the rotating shaft or vibration generated by displacement of a member to which the encoder is attached is applied to the connector, the vibration is generated. As a result, friction occurs between the terminals of the connector, causing noise, or the terminals may be separated from each other to cause intermittent signals. Conventionally, it has been considered that a connector cannot be used as an electrical connection means because intermittent noise or a signal becomes a fatal defect as a sensor.

An object of the present invention is to electrically connect a circuit on a base-side circuit board and a circuit on a non-base-side circuit board by using a connector without generating noise or intermittent signals. It is to provide a photoelectric encoder which can be used.

Another object of the present invention is to provide a photoelectric encoder which is easy to assemble without generating noise or intermittent signals and which greatly improves the yield of products.

Another object of the present invention is to provide a photoelectric encoder capable of preventing a situation in which an input / output connection cord touches a rotary plate without using a special member other than a base member. To provide.

Another object of the present invention is to provide a photoelectric encoder in which a gap defining sheet for defining a gap dimension between a light emitting or light receiving element and a rotating plate can be easily inserted and pulled out. .

[0008]

According to the present invention, there is provided a base member having a rotating shaft, a base member disposed on one side in the axial direction of the rotating shaft and having the rotating shaft passing therethrough, and a predetermined light transmission pattern. A rotating plate provided with and fixed to the rotating shaft, a light emitting element and a light receiving element that are arranged opposite to each other to allow rotation of the rotating plate on both axial sides of the rotating shaft of the rotating plate and transmit and receive light through a light transmission pattern, A base portion side circuit board provided with one of the light emitting element and the light receiving element and attached to the base portion of the base member; Non-base-side circuit board, which is disposed at an interval to the base member, and electrical connection means for electrically connecting the circuit of the base-side circuit board and the circuit of the non-base-side circuit board Photoelectric type having , The improvement of which is aimed at the coder.

The rotating shaft may be, for example, a rotating shaft of a motor to which a photoelectric encoder is attached, or another rotating shaft to be attached to the rotating shaft of the motor. In the former case, the base member is to be attached to, for example, an end bracket of the motor. In the latter case, a bearing for supporting the rotating shaft is attached to the base member, or in a case where the base member is attached. A bearing for supporting the rotating shaft is attached.

In the present invention, the base member is provided with a peripheral wall portion extending from the outer peripheral portion of the base portion to the other side in the axial direction and surrounding the rotary plate from the outside in the radial direction. Further, as an electrical connection means for electrically connecting the circuit of the base part side circuit board and the circuit of the non-base part side circuit board, a male connector half having a male terminal attached to a male connector body and a female A connector comprising a female connector half and a female terminal fitted to a male terminal is attached to a male connector body. Then, one of the male connector half and the female connector half is attached to the base portion side circuit board so as to be located radially outside the rotating plate, and the male connector half and the female connector half are attached to the non-base portion side circuit board. Install the other half of the female connector half. A connector body fitting portion is formed on the peripheral wall portion of the base member to hold the male connector body and the female connector body of the male connector half and the female connector half in a fitted state, and Attach the non-base part side circuit board to the peripheral wall part.

According to the present invention, the circuit on the base portion side circuit board and the circuit on the non-base portion side circuit board are connected by using a connector. Can be treated separately. Therefore, assembling becomes easy, and both can be inspected separately, and even if there is a defect as a result of the inspection, they can be individually replaced. Therefore, the product yield is greatly improved. In addition, in the present invention, even if a connector is used, no noise or intermittent signal is generated due to friction or non-contact of the contact portion of the terminal for the following reason. .

In the present invention, the male connector body and the female connector body are fitted to the connector body fitting portion of the base member, and the base-side circuit board and the non-base-side circuit board are also directly attached to the base member. ing. Therefore, even when vibration is generated by rotation of the rotating plate or when external vibration is applied, the base member, the male connector half and the female connector half, the base-side circuit board and the non-base-side circuit board Does not vibrate individually, but vibrates together in a state where each member is substantially integrated. As a result, abrasion or friction does not occur at the contact portion between the male terminal and the female terminal, and neither terminal is brought into a non-contact state. Therefore, even if the circuit of the base-part-side circuit board and the circuit of the non-base-part-side circuit board are connected using the connector, generation of noise and intermittent output do not occur.

The connector main body fitting portion may be of any structure as long as the male connector main body and the female connector main body can be fitted without rattling. For example, a board supporting portion for supporting a base portion side circuit board is provided along a rotating plate on a base portion of a base member, and a connector main body fitting portion is formed on a peripheral wall portion of the base member corresponding to the board supporting portion. Can be. Specifically, the connector body fitting portion defines an opening that opens at least on the other side in the axial direction of the rotation shaft and an opening that is located in the circumferential direction of the peripheral wall portion (both circumferential sides of the opening portion). ), And a base member side fitting portion formed on each of the pair of opposed wall portions. The male connector body and the female connector body each have a connector-side fitting portion that is fitted to the base member-side fitting portion at a portion facing the pair of opposed wall portions. The base member side fitting portion and the connector side fitting portion are formed so as to slidably fit the male connector main body and the female connector main body from the other side in the axial direction of the rotating shaft to one side in the axial direction. I just need. With this configuration, the fixing and positioning of the connector with respect to the base member can be performed only by the operation of fitting the connector-side fitting portions of the male connector body and the female connector body with the base member-side fitting portion. Becomes easier.

The input / output connection cord can be attached to either the base portion side circuit board or the non-base portion side circuit board. Connection becomes easy. When connecting the input / output connection cord to the non-base part side circuit board, make sure that the connection cord does not enter inside the peripheral wall part with the non-base part side circuit board attached to the peripheral wall part. Preferably, the peripheral wall of the base member is formed so as to surround the periphery of the base member. With this configuration, since the peripheral wall portion of the base member performs a guard function, it is possible to prevent a situation in which the connection cord touches the rotating plate without using a special member different from the base member. .

The connection cord may be connected using a connector. This makes it easy to assemble the photoelectric encoder and allows the connection cord to be reused.

When the male connector half is mounted on the base side circuit board, and the light emitting element or the light receiving element and the male connector half are arranged in a radial direction, the light emitting element or the light receiving element, the rotating plate and The gap defining sheet for defining the gap dimension between the two cannot be inserted. Therefore, a plurality of male terminals attached to the male connector half, the passage of the gap defining sheet to be inserted between the light emitting element or light receiving element and the rotating plate from the radial outside through the opening, Preferably, it is attached to the male connector body. Specifically, a plurality of male terminals may be arranged in a line at the center so as to form a passage having a width equal to or greater than the width of the gap defining sheet.

When the two circuit boards on the base portion side are arranged at positions facing each other in the radial direction, the electrical connection means is provided for the first and second circuit boards provided corresponding to the circuit boards on the base portion side.
Consists of connectors. With this configuration, since the first and second connectors are arranged at positions facing each other in the radial direction, the connection operation of the first and second connectors is easy, and the first and second connectors are connected to each other. No excessive force is applied to the non-base-part-side circuit board during the connection operation, and peeling or the like does not occur at the soldered part.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial sectional view of an embodiment of the photoelectric encoder of the present invention mounted on a motor. In FIG. 1, 1 is a base member, 3A and 3B are first and second base portion side circuit boards, 5 and 5 are light receiving elements, and 7 is a rotating shaft (measured object) of a motor. Reference numeral 9 denotes a rotary plate unit including a rotary plate 9a, 11 denotes a non-base portion side circuit board,
Reference numerals 3 and 13 denote light emitting elements, 15A and 15B denote first and second connectors, 17 denotes a motor end bracket constituting a metal mounting base, and 19 denotes a cover member.

As shown in detail in FIGS. 2 and 3, the base member 1 has a structure comprising a base portion 21 and a peripheral wall portion 23, and is integrally formed of an insulating resin such as polybutylene terephthalate. . 2A and 2B are a plan view and a side view of the base member 1, and FIGS. 3A and 3B are cross-sectional views taken along line AA of FIG.
It is a B sectional view. As shown in FIGS. 2 and 3, the base portion 21 has an annular shape having a circular through hole 21a at the center. The base portion 21 has four mounting through holes 2.
[FIG. 2 (A)], and a screw penetrating through the mounting through holes 21b is screwed into a screw fixing hole (not shown) provided in the end bracket 17 so that the base is formed. The member 1 is attached to the end bracket 17. At the center of the end bracket 17, an opening 17a through which the rotating shaft 7 passes is formed.

The base portion 21 is provided with substrate supporting portions 21c and 21d for supporting the base portion side circuit boards 3A and 3B along the rotating plate 9a shown in FIG.
They are provided so as to be arranged in the radial direction with 1a interposed therebetween.
One of the substrate supporting portions 21c for supporting the first base portion side circuit board 3A has a concave portion 21c1 at a central portion, and the concave portion 21c1
It has a structure provided with a support surface 21c2 so as to surround the periphery of c1. The other substrate supporting portion 21d for supporting the second base portion side circuit board 3B also has a concave portion 21d1 at the center.
And a supporting surface 21d2 on both sides of the concave portion 21d1. The concave portions 21c1 and 21d1 provided in the substrate supporting portions 21c and 21d are formed to accommodate a part of soldering terminals such as light receiving elements.

2 and 3, the peripheral wall portion 23 of the base member 1 extends in the axial direction of the rotary shaft 7 from the outer peripheral portion of the base portion 21 to surround the rotary plate unit 9 from the outside in the radial direction. It is formed as follows. Here, the rotating plate unit 9 includes a rotating plate 9a having a predetermined light transmission pattern,
Bosses 9b and 9c are disposed on both sides of the rotating plate 9a and used for positioning and fixing the rotating plate 9a. These members 9a to 9c are combined integrally, and attached to the rotating shaft 7 with the rotating plate unit 9 as one member. The attachment and positioning of the rotating plate unit 9 on the rotating shaft 7 are performed by screwing a screw hole into a boss 9b.
And the screw S is strongly pressed against the rotating shaft 7. When the screw S used for positioning the rotating plate unit 9 is to be tightened or loosened, a driver is inserted through a slit 23k (see FIG. 2A) provided in the peripheral wall portion 23.

The substrate support portions 21c and 21d of the base portion 21
The two portions of the peripheral wall portion 23 located on the outside in the radial direction of
Connector body fitting portions 23a and 23b to which the first and second connectors 15A and 15B respectively fit are formed. The connector main body fitting portions 23a and 23b are formed by rectangular cutouts of the peripheral wall 23 so that the peripheral wall 23 is discontinuous. The connector main body fitting portions 23a and 23b define an opening 23c that opens in the axial direction and the radial direction of the rotating shaft 7 and an opening 23c that is located in the circumferential direction of the peripheral wall 23 or defines the opening 23c.
It is composed of a pair of opposing wall portions 23d and 23e sandwiching c, and base member side fitting portions 23f and 23g formed on the pair of opposing wall portions 23d and 23e, respectively. In this example, the base member-side fitting portions 23f and 23g are formed by U-shaped or semicircular grooves having a cross section extending in a direction parallel to the axial direction of the rotary shaft 7. In addition, the peripheral wall 23
Connector body fitting portion 23a and connector body fitting portion 23
2b, one of the two arc-shaped wall portions is provided with a connection cord extraction hole 23h [FIGS. 2A and 2B].
Reference] is formed. In addition, connection cord outlet hole 23h
Is formed on the inside of the peripheral wall portion 23, and an upright wall portion 23m having an arc shape is provided inside the peripheral wall portion 23 to form a double wall structure. The upright wall 23m prevents a part of the connection cord from touching the rotating plate 9a.

The base-side circuit boards 3A and 3B are mounted on the substrate supporting portions 21c and 21d of the base member 1, and are fixed to the substrate supporting portions 21c and 21d using an adhesive.

The light receiving elements 5, 5 attached to the base part side circuit boards 3A, 3B are well-known light receiving elements using a phototransistor or the like, and perform signal processing by receiving light passing through the rotating plate 9a. It is a commercially available unit configured as described above. The light receiving elements 5, 5 are attached to the substrates 3A, 3B so as to allow the rotation of the rotating plate 9a.
As described later, the rotating plate 9a and the light receiving elements 5, 5
It is important that the gap between them is within a predetermined range (preferably substantially constant), and the gap is adjusted by adjusting the mounting position of the rotating plate 9a. The base-side circuit boards 3A and 3B have a plurality of through holes into which the terminals of the male connector halves 27 and 27 'of the connectors 15A and 15B are inserted in addition to the electrode patterns for attaching the light receiving elements 5 and 5. A plurality of male terminals of the male connector halves 27 and 27 'are electrically connected to the terminals of the light receiving element 3 including holes and soldering lands to which the ends of the terminals penetrating through holes are connected by soldering. Circuit patterns and the like are formed. The structure of the connectors 15A and 15B will be described later in detail.

The rotating plate 9a has a structure in which a predetermined light transmission pattern is printed on a glass plate. Light emitting element 1
The light from the light receiving elements 5 and 5 is received by the light receiving elements 5 and 5 through the light transmission pattern of the rotating plate 9a to detect the movement position of the device to be measured connected to the rotating shaft 7.

As shown in FIG. 4, the non-base portion side circuit board 11 has an annular shape with a circular through hole 11a formed in the center. FIG. 4 is a plan view schematically showing the non-base portion side circuit board 11 to which the encoder connection connector 25 is connected, excluding a circuit pattern, as viewed from above in the drawing of FIG. This non-base portion side circuit board 1
1 is arranged in a state where the outer peripheral portion of the back surface is placed on the upper end surface 23i of the peripheral wall portion 23 of the base member 1. The non-base portion side circuit board 11 has four mounting through-holes 11 b. Screws penetrating the mounting through-holes 11 b and the four through-holes 23 j provided in the peripheral wall 23 are provided. The non-base portion side circuit board 11 is fixed to the base member 1 and the end bracket 17 by being screwed into a screw fixing hole provided in the end bracket 17.

Further, two light emitting elements 13 are mounted on the non-base portion side circuit board 11 at positions facing the light receiving elements 5 and 5 with the through hole 11a interposed therebetween. These light emitting elements 13 are known light emitting elements using light emitting diodes or the like. Although not shown,
On the surface of the non-base portion side circuit board 11, the light emitting element 13,
Circuit patterns and electronic components constituting a signal processing circuit for processing signals from the drive circuits 13 and the light receiving elements 5 and 5 are mounted. The light emitting elements 13 and 13 are attached to the substrate 11 in a state where the main body is fitted in a through hole formed in the circuit board 11 on the non-base portion side. The projected size is such that the emitted light is
a so as to allow the rotation of the rotating plate 9a.

The connector 1 is mounted on the non-base portion side circuit board 11 so as to be arranged radially outside the light emitting elements 13 and 13.
Nine through holes 11f... Into which the lead pins 5A and 15B are inserted and nine through holes 11g. The connectors 15A, 1
5B is attached to the back side seen in the state of FIG. The through holes 11f..., 11g.
They are arranged so as to be aligned in a line along the straight portions 11h and 11i formed on the outer peripheral portion of the first. Further, a through-hole 11f is formed in the peripheral portion of the non-base portion side circuit board 11.
And between the through-holes 11g are formed concave portions 11j that open toward the outside in the thickness direction and the surface direction of the non-base portion side circuit board 11 (outside in the radial direction of the rotating shaft). An encoder connection connector 25 for electrically connecting the connection cord C to a circuit (not shown) on the surface of the non-base portion side circuit board 11 is attached to the concave portion 11j. The structure of the encoder connection connector 25 will be described later in detail.

First and second connectors 15A, 15B
Have the same structure except that the height dimensions of the male connector halves 27, 27 'attached to the base part side circuit boards 3A, 3B are different, and the male connectors can be fitted and connected respectively. Connector halves 27, 27 'and female connector halves 2
9, 29. By connecting the male connector halves 27, 27 'and the female connector halves 29, 29, the circuits of the base-side circuit boards 3A, 3B and the circuit of the non-base-side circuit board 11 are electrically connected. Connected to.

FIG. 5 shows that the connector-side fitting portions 27c of the male connector half 27 attached to the base-side circuit board 3A are attached to the connector body fitting portion 23a provided on the peripheral wall portion 23 of the base member 1. And the male connector half 27
On the other hand, the state immediately before combining the female connector half 29 mounted on the non-base portion side circuit board 11 is enlarged. The female connector half portion 29 is attached to the non-base portion side circuit board 11, and the connector side fitting portions 29e, 29e are fitted to the vertical groove-shaped base member side fitting portions 23f, 23g formed in the peripheral wall portion 23. Is fitted to the male connector 27. With such a fitting structure, both the male connector half 27 and the female connector half 29 are mechanically and firmly connected to the peripheral wall portion 23 of the base member 1, and the male connector half 27 and the female connector Half 2
9 and the base member 1 vibrate together without vibrating individually.

The male connector half 27 used in this example is
As shown in FIGS. 6 (A) to 6 (C), the male connector body 27a made of insulating resin has a structure in which nine male terminals 27b are implanted. 6A to 6C are a front view, a plan view, and a side view of the male connector half part 27. The male connector main body 27a has an elongated shape, and a pair of connector-side fitting portions 27c, 27c fitted to the base member-side fitting portions 23f, 23g provided on the peripheral wall portion 23 are provided at both ends in the longitudinal direction. Prepared in the department. The pair of connector-side fitting portions 27c, 27c are configured such that the male connector main body 27a is
3 has a shape that can be slidably fitted to the connector main body fitting portion 23a and firmly fitted to the extent that no rattling occurs. Specifically, the connector-side fitting portions 27c, 27c are formed so as to have the same cross-sectional shape as the base-side fitting portions 23f, 23g formed of U-shaped or semicircular grooves.
Is defined.

The nine male terminals 27b... Implanted in the male connector main body 27a have solder terminal portions 2 at one end.
7d, and a connection terminal 27e at the other end. The lower portion than the center in the longitudinal direction is press-fitted into a through-hole provided in the male connector main body 27a. The male terminals 27b are arranged so that the base portion-side circuit board 3A having the male connector half portion 27 is positioned and fixed to the base member 1, and the diameter of the base portion 21 passes through the opening 23c of the connector body fitting portion 23a. In order to secure a path for the gap defining sheet inserted between the light receiving elements 5 and 5 and the rotating plate 9a from the outside in the direction, they are arranged in a line with a large interval passage T therebetween. In particular,
Five male terminals 27b arranged at equal intervals
And the four male terminals 27b are formed with passages T which are equal to or larger than the width of the gap defining sheet. In a state where a gap defining sheet (not shown) is inserted between the light receiving element 5 and the rotating plate 9a through the passage T during the assembling step shown in FIG. 5, the rotating plate 9a using the screw S shown in FIG. The rotating plate unit 9 is fixed to the rotating shaft 7. Then, after the fixing of the rotating plate unit 9 is completed, the gap defining sheet is extracted from the passage T, and then the connector side fitting portions 29e, 29e are fitted.

The soldering terminal portions 27d are inserted into through holes (not shown) provided on the base portion side circuit board 3A as shown in FIG. 5, and soldered to soldering lands provided on the back side of the circuit board 3A. It is connected. Male connector halves 2 of each of the first connectors 15A and 15B
Reference numerals 7 and 27 'are fixed to the base-side circuit boards 3A and 3B, respectively, so as to be located radially outside the rotating plate 9a and to be arranged in the radial direction of the light receiving elements 5 and 5 and the base 21.

The female connector half 29 is shown in FIGS.
As shown in (D), the female connector body 29a has a structure in which nine female terminals 29b are attached. 7A to 7D are a front view, a plan view, a side view, and a cross-sectional view of the female connector half part 29. The female connector main body 29a is provided with a contact end surface 27a1 of the male connector half 27.
A contact end surface 29c that comes into contact with FIG. 6B and a pair of extension walls 29d, 29 extending beyond the contact end surface 29c.
d, and a pair of connector-side fitting portions 29e, 29e located on both sides in the longitudinal direction, and are integrally formed of insulating resin. The connector-side fitting portions 29e have a shape that allows the female connector main body 29a to be slidably fitted into the connector body fitting portions 23a and 23b of the peripheral wall portion 23 in FIGS. I have. Specifically, the connector side fitting portion 2 of the male connector main body 27a
As in the case of 7c and 27c, the projection is formed by a projection having a semicircular cross-sectional shape so as to be press-fitted into the grooves forming the base member side fitting portions 23f and 23g of the peripheral wall portion 23.

The connector body 29a has nine terminal insertion holes 29f penetrating therethrough in a direction perpendicular to the longitudinal direction of the connector body 29a. As shown in FIG. 7D, these terminal insertion holes 29f have an insertion side opening 29f1 and a mounting side opening 29f2. The insertion side opening 29f1 is open to the contact end surface 29c,
The male terminals 27b of the male connector half 27 are inserted from the insertion side opening 29f1. Also, the mounting side opening 29
f2 is opened so as to face the back surface of the non-base portion side circuit board 11.

Female terminals 29b are press-fitted into these terminal insertion holes 29f from the mounting side openings 29f2. As shown in FIG. 7D, the female terminal 29b includes a female contact portion 29b1 and a soldering terminal portion 29b2. The female contact portion 29b1 has a structure for holding the male terminal 27b inserted from the insertion opening 29f1 from both sides. Also, soldering terminal portions 29b2 ...
Are formed so as to protrude outward from the mounting side opening 29f2 of the female connector main body 29a and to be solderable. The solder terminal portions 29b2 of the connector 15A shown in FIG.
Are through holes 11f of the non-base portion side circuit board 11.
(FIG. 4), the soldering terminal portions 29b2 of the second connector 15B are inserted into the through holes 11g of the non-base portion side circuit board 11 (FIG. 4), respectively. Are soldered to the solder lands of the circuit on the non-base portion side circuit board 11. This allows
The female connector halves 29, 29 of the first connectors 15A and 15B, respectively, are located radially outside the rotating plate 9a, and the light emitting elements 13, 13 and the non-base portion side circuit board 11
Are fixed to the non-base portion side circuit board 11 so as to be arranged in the radial direction.

The extension walls 29d, 29d have a flat plate shape, and extend beyond the contact end surface 29c to form the male connector half 2a.
It protrudes to the 7 side. These extension walls 29d, 29d
The male connector main body 27a is sandwiched from both sides in a state where the male connector half 27 and the female connector half 29 are joined, and comes into contact with both side surfaces 27f, 27f. Extension wall 2
9d, elongated surfaces 29g, 2 extending along the connector-side fitting portions 29e, 29e respectively positioned on both sides in the longitudinal direction.
9g contacts the pair of opposed wall portions 23d and 23e of the peripheral wall portion 23 in a state where the female connector half portion 29 is fitted to the connector main body fitting portions 23a and 23b of the peripheral wall portion 23. In this example, the extension walls 29d, 29d are provided, and the side surfaces 27f, 27f of the male connector half 27 are attached to the extension walls 29d.
Since the structure is such that the male connector half portion 27 and the female connector half portion 29 are held between the male connector half portion 27 and the female connector half portion 29, it is possible to prevent the occurrence of displacement or rattling.

Next, a structure in which the input / output connection cord C is connected to the circuit board 11 using the encoder connection connector 25 will be described with reference to FIGS. The circuit board 11 has a recess 11j for attaching the connector 25.
Is formed. The concave portion 11j is provided with a pair of opposing edges 11j1, 11j1 extending substantially in parallel and a connecting edge 11j connecting the pair of opposing edges 11j1, 11j1.
2 and surrounded by. On the both surfaces of the non-base portion side circuit board 11, seven soldering electrodes 11k are formed along the connecting edge 11j2. The circuit patterns connected to the soldered electrodes 11k are omitted.

The encoder connection connector 25 fitted into the recess 11j is composed of a first connector half 31 and a second connector half 33. As shown in FIGS. 9A to 9C, the first connector half 31 has a structure in which fourteen male terminals 31a constituting a first terminal are implanted in a first connector main body 31b. have. FIG. 9
(A)-(C) are front views of the first connector half 31;
It is a top view and a side view, in which the circuit board 11 is shown by imaginary lines. The male terminal 31a has a solder terminal 31c at one end and a connection terminal 31d at the other end. These terminal portions 31c and 31d respectively protrude in both directions. The central portion of the male terminal 31 in the longitudinal direction is the first connector main body 3.
1b. 14 male terminals 31a
.. Are arranged in a line to form two terminal rows. The two terminal rows are arranged so as to be arranged in parallel. And a male terminal 31 constituting two terminal rows
Each of the soldering terminal portions 31c a and 31a is curved so as to approach each other. The degree of this curvature is shown in FIG.
As shown in (B), the circuit board 11 can be sandwiched from both front and back sides between the vertexes of the curved portion of the soldering terminal portion 31c. Since the soldering terminal 31c is curved, the first connector half 31 is
In the process of fitting to j, the soldering terminal portion 31c opens naturally while contacting the circuit board 11. Therefore, the assembling work becomes easy.

The first connector main body 31b of the first connector half 31 is formed in a substantially rectangular parallelepiped shape by an insulating resin. A pair of opposite edge portions 11j1, 11j1 of the non-base portion side circuit board 11 are provided on a pair of outer wall portions or side wall portions located on both sides in the direction in which the terminal rows of the male terminals 31a. Substrate fitting grooves 31e, 31e to be fitted are formed. Board fitting groove 31
e, 31e are fitted to the non-base portion side circuit board 11, and the curved portions of the soldering terminal portions 31c of the male terminals 31a forming the two terminal rows are connected to the non-base portion side circuit board 11. Contact the electrodes 11k. The plurality of electrodes 11k include, in addition to the electrodes constituting the electric circuit,
Some electrodes are provided merely for the purpose of fixing the male terminal 31a. Soldering terminal 31c and electrode 11
The first connector half 31 is firmly fixed to the non-base-part-side circuit board 11 by joining k with solder.

The second connector half 33 is shown in FIG.
As shown in (C), it has a structure in which 14 female terminals are attached to a second connector main body 33a made of insulating resin. The second connector main body 33a includes a terminal fixing portion 33.
b has a structure in which a pair of flange portions 33c, 33c are provided integrally. FIGS. 10A to 10C are a front view, a plan view, and a side view of the second connector main body 33a. Inside the terminal fixing portion 33b, 14 terminal insertion holes 33d are formed so as to form two rows. The terminal insertion holes 33d are formed so as to form two rows arranged in parallel with seven holes into which the male terminals 31a of the first connector half 31 are inserted. Each terminal insertion hole 33d is a male terminal 31a of the first connector half 31.
Have a male terminal insertion opening 33d1 and a female terminal insertion opening 33d2. Female terminal insertion opening 33d2 ...
Female terminal insertion opening 33d2 into which male terminal 31a electrically connected to a circuit on circuit board 7 is inserted.
The female terminal C1 connected to the core wire of the input / output connection cord C is inserted into the connector. As a result, the male terminal 31a and the female terminal C1 (FIG. 4) are connected in the terminal insertion hole 33d. As the female terminal C1, a crimp terminal crimped to the tip of the core of the lead wire of the input / output connection cord C can be used.

The input / output connection cord C is led out through a connection cord outlet 23h (FIG. 2) of the base member 1. The peripheral wall portion 23 of the base member 1 surrounds most of the periphery of the rotary plate 9a, and the connection cord extraction hole 23h and the second connector half portion 33 are close to each other. Is derived to the outside without getting inside.

The pair of outer walls of the terminal fixing portions 33b located on both sides in the direction in which the rows of the terminal insertion holes 33d extend extend.
Substrate fitting grooves 33e, 33e into which 1, 1j1 are fitted are formed. These board fitting grooves 33e, 33e
Second connector half 3 with respect to first connector half 31
3 and is formed so as to be aligned with the board fitting grooves 31 e of the first connector half 31.
The flange portions 33c are connected to the non-base portion side circuit board 1.
It is formed so as to extend along the surface of the non-base portion side circuit board 11 beyond one pair of opposing edge portions 11j1, 11j1. Screw holes 33c1, 33c1 are formed in the flange portions 33c, 33c, respectively.
The screw holes 33c1 and 33c1 are aligned with the screw through holes 11m and 11m of the non-base portion side circuit board 11, and the screw S2 (FIG. 4) is screwed into both holes 33c1 and 11m. The second connector half 33 is attached to the non-base portion side circuit board 11.

Next, a method of assembling the photoelectric encoder of this embodiment will be schematically described. First, the base part side circuit boards 3A, 3B to which the light receiving elements 5, 5 are respectively attached are attached to the base member 1. Next, the male connector halves 27, 27
'The connector side fitting portions 27c, 27c are connected to the base member side fitting portions 23f, 2 of the connector body fitting portions 23a, 23b.
Fit to 3g. And the male connector halves 27,2
7 'of the soldering terminal portions 27d.
A, half of male connector 2 inserted into through hole of 3B
7, 27 'are temporarily fixed to the base-side circuit boards 3A and 3B to form a base-side assembly. Next, the connector side fitting portions 29e, 29e of the female connector half portions 29, 29 are
The male connector halves 27 and 27 'and the female connector halves 29 and 2 are fitted to the base member side fitting portions 23f and 23g of the connector body fitting portions 23a and 23b of the base member 1.
9 is joined. Next, the non-base portion side circuit board 11 is inserted into the base portion side assembly so that the through holes 11f, 11g... Of the non-base portion side circuit board 11 are inserted into the solder terminal portions 29b2. Temporarily. Next, the male connector halves 27 and 27 'are soldered to the base-side circuit boards 3A and 3B, and the female connector halves 29 and 29 are soldered to the non-base-side circuit board 11. As a result, a non-base portion side assembly in which the female connector half portions 29, 29 are fixed to the non-base portion side circuit board 11 is formed. Next, the male connector halves 27, 27
'And the female connector halves 29, 29 to separate the base-side assembly and the non-base-side assembly. Next, the base-side assembly is attached to the end bracket 17 of the motor such that the rotating shaft 7 of the motor passes through the through hole 21a. Next, the male connector half 2
The gap defining sheet is inserted from the passages T, T of 7, 27 ', and the rotating plate unit 9 is fitted to the rotating shaft 7 with the gap defining sheet placed on the light receiving elements 5, 5. The light receiving elements 3 and 3 and the rotating plate 9 are
With the gap between the boss 9a and the boss 9b kept constant, the screw S provided on the boss 9b is tightened and then the gap defining sheet is removed. Next, the non-base portion side assembly is combined with the base portion side assembly so that the male connector half portions 27, 27 'and the female connector half portions 29, 29 are combined. It is fixed to the part side assembly and the end bracket 17. Next, the cover member 19 is attached to the end bracket 17 to complete the assembly.

According to this example, the male connector halves 27,
27 'and female connector halves 29, 29 are respectively combined with the first and second connectors 15A, 15A.
The outer side in the radial direction of the rotating plate 9a is continuously surrounded by 5B and the peripheral wall portion 23. The peripheral portions of the back surface of the non-base portion side circuit board 11 are connected to the connectors 15A and 15B and the base member 1.
And is continuously joined to the peripheral wall portion 23. Therefore, the base member 1, the male connector halves 27, 27 'and the female connector halves 29, 29, and the base-side circuit boards 3A, 3B
The non-base portion side circuit board 11 is connected to the non-base portion side circuit board 11 in a state of being substantially integrated. As a result, the male terminals 27b of the male connector halves 27, 27 'and the female terminals 29b of the female connector halves 29 even when vibrations due to the rotation of the rotating shaft 7 or vibrations from the outside are applied. In the meantime, there is substantially no occurrence of a slip that causes friction or a situation in which both terminals are brought into a non-contact state.

In this embodiment, the light receiving elements 5 and 5 are mounted on the base-side circuit boards 3A and 3B, respectively, and the light-emitting elements 13 and 13 are mounted on the non-base-side circuit board 11. One of the elements may be mounted on the base-side circuit board, and the other of the light-emitting element and the light-receiving element may be mounted on the non-base-side circuit board. 13 and 13 may be attached to the base part side circuit boards 3A and 3B, respectively.

Although the present embodiment is an example in which the rotating shaft 7 of the motor is used as the rotating shaft of the photoelectric encoder, a dedicated rotating shaft is provided in the photoelectric encoder, and the dedicated rotating shaft and the rotating shaft of the motor are provided. The shaft and the shaft may be connected. In this case, a bearing for supporting a dedicated rotating shaft may be attached to the base member or a case to which the base member is attached.

[0048]

According to the present invention, the circuit on the base portion side circuit board and the circuit on the non-base portion side circuit board are connected using the connector. Substrate units can be handled separately. Therefore, assembling becomes easy, and both can be inspected separately, and even if there is a defect as a result of the inspection, they can be individually replaced. Therefore, the product yield is greatly improved. Moreover, according to the present invention, the base member, the male connector half and the female connector half, the base-side circuit board, and the non-base-side circuit board do not vibrate individually but vibrate together. For,
Even if the circuit on the base portion side circuit board and the circuit on the non-base portion side circuit board are connected using a connector, no noise or intermittent output occurs.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a photoelectric encoder according to an example of an embodiment of the present invention.

FIGS. 2A and 2B are a plan view and a side view of a base member used for a photoelectric encoder. FIGS.

FIG. 3A is a sectional view taken along line AA of FIG. 2;
FIG. 3B is a sectional view taken along line BB of FIG. 2.

FIG. 4 is a plan view of a non-base portion side circuit board used in the photoelectric encoder of FIG. 1;

FIG. 5 is a diagram used to explain the connection state of the connectors.

FIGS. 6A to 6C are a front view, a plan view, and a side view of a first connector half used in the photoelectric encoder of FIG. 1;

FIGS. 7A to 7D are a front view, a plan view, a side view, and a cross-sectional view of a second connector half used in the photoelectric encoder of FIG. 1;

FIG. 8A is an exploded view used to explain an attachment structure of the encoder connection connector 25, and FIG. 8B is a view used to explain an attachment structure of the encoder connection connector 25.

FIGS. 9A to 9C are a front view, a plan view, and a side view of a male connector half of an encoder connection connector 25 used in the photoelectric encoder of FIG.

FIGS. 10A to 10C are a front view, a plan view, and a side view of a female connector half of an encoder connection connector 25 used in the photoelectric encoder of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base member 3A, 3B Base part side circuit board 5, 5 Light receiving element 7 Rotating shaft 9a Rotating plate 11 Non-base part side circuit board 11j Concave part 11j1 Opposite edge part 11j2 Connection edge part 13 Light emitting element 15A, 15B Connector 21 Base part 21c , 21d Board support part 23 Peripheral wall part 23a, 23b Connector body fitting part 23c Opening part 23d, 23e A pair of opposing wall parts 23f, 23g Base member side fitting part 23h Connection cord extraction hole 27 Male connector half part 27a Male type Connector body 27b ... Male terminal 27c Connector side fitting part 29 Female connector half part 29a Female connector body 29b ... Female terminal 29e Connector side fitting part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Yoshihiro Sato, Inventor Sanyo Electric Co., Ltd. 1-5-15-1 Kita-Otsuka, Toshima-ku, Tokyo (56) References JP-A-3-246419 (JP, A) Kaisho 63-7310 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01D 5/26-5/38

Claims (7)

(57) [Claims] 1. A base member provided with a rotating shaft, a base portion disposed on one side of the rotating shaft in the axial direction and through which the rotating shaft passes, and fixed to the rotating shaft with a predetermined light transmission pattern. A rotating plate, a light-emitting element and a light-receiving element that are arranged on both sides in the axial direction of the rotating shaft of the rotating plate so as to allow rotation of the rotating plate, and that transmit and receive light through the light transmission pattern; A base part side circuit board provided with one of an element and a light receiving element and attached to the base part of the base member, and the other one of the light emitting element and the light receiving element and an axial direction of the rotating shaft from the rotating plate. A non-base portion side circuit board, which is arranged at an interval on the other side of the base member and is attached to the base member, a circuit of the base portion side circuit board and a circuit of the non-base portion side circuit board. To An electrical encoder comprising: an electrical connection unit for connecting the base member; and the base member includes a peripheral wall portion extending from an outer peripheral portion of the base portion to the other side in the axial direction and surrounding the rotary plate from a radially outer side. The electrical connection means comprises a male connector half having a male terminal attached to a male connector main body, and a female terminal fitted to the male terminal attached to a female connector main body. A connector comprising a female connector half, and one of the male connector half and the female connector half is attached to the base portion side circuit board so as to be located radially outside the rotating plate. The other of the male connector half and the female connector half is attached to the non-base portion side circuit board, and the male connector half and the female connector are mounted on the peripheral wall of the base member. A connector body fitting portion for holding the male connector body and the female connector body in a half portion in a fitted state is formed, and the non-base portion side circuit board is attached to the peripheral wall portion of the base member. A photoelectric encoder characterized in that: 2. A board supporting portion for supporting the circuit board on the base portion side is provided along the rotating plate on the base portion of the base member, and the connector main body fitting portion is provided on the board supporting portion. An opening formed in the peripheral wall portion of the base member correspondingly and opening at least on the other side in the axial direction; and a pair of opposed wall portions positioned in the circumferential direction of the peripheral wall portion to define the opening. A base member side fitting portion formed on each of the pair of opposed wall portions, and portions of the male connector main body and the female connector body opposed to the pair of opposed wall portions each include the base. A connector-side fitting portion that fits with the member-side fitting portion is formed, and the base member-side fitting portion and the connector-side fitting portion move the male connector body and the female connector body in the axial direction. The other side of 2. The photoelectric encoder according to claim 1, wherein the photoelectric encoder is formed so as to be slidably fitted to one side in the axial direction. 3. An input / output connection cord is attached to the non-base portion side circuit board, and the non-base portion side circuit board is attached to the peripheral wall portion of the base member. 2. The photoelectric encoder according to claim 1, wherein the photoelectric encoder surrounds the periphery of the rotary plate so that the connection cord does not enter the inside of the peripheral wall in the closed state. 3. 4. The photoelectric encoder according to claim 3, wherein the connection cord is connected using a connector. 5. The male connector half part is attached to the base part side circuit board, and the light emitting element or the light receiving element and the male connector half part are arranged so as to be arranged in a radial direction. The plurality of male terminals attached to the male connector half portion pass through a passage of a gap defining sheet inserted between the light emitting element or the light receiving element and the rotating plate from the radial outside through the opening. The photoelectric encoder according to claim 1, wherein the photoelectric encoder is attached to the male connector main body so as to secure it. 6. The photoelectric encoder according to claim 5, wherein the plurality of male terminals are arranged in a row so as to form a passage having a width equal to or greater than the width of the gap defining sheet at a central portion. 7. A base member having a rotating shaft, a base portion disposed on one side in the axial direction of the rotating shaft and penetrating the rotating shaft, and a fixed light transmitting pattern, fixed to the rotating shaft. A rotating plate that is disposed opposite to both sides of the rotating shaft in the axial direction of the rotating shaft so as to allow rotation of the rotating plate, and transmits and receives light through the light transmission pattern.
Two light-emitting elements and two light-receiving elements, two base-part-side circuit boards provided with one light-receiving element and attached to the base part of the base member, and two light-emitting elements, and A non-base portion side circuit board which is arranged at an interval from the rotating plate to the other side in the axial direction of the rotation shaft and is attached to the base member; a circuit of the base portion side circuit board; An electrical connection means for electrically connecting a circuit of the unit-side circuit board to the circuit, wherein the base member extends from the outer peripheral portion of the base portion to the other side in the axial direction, and the rotation is performed. A peripheral wall portion surrounding the plate from a radially outer side; the two base part side circuit boards are arranged at positions facing each other in a radial direction; and the electrical connection means is a male terminal body attached to a male connector body. I was A first connector and a second connector each including a male connector half and a female connector half in which a female terminal fitted to the male terminal is attached to the female connector main body; The male connector halves of the first and second connectors are respectively attached to the base portion side circuit board so as to be located radially outside the rotating plate and radially aligned with the light receiving element, The female connector halves of the first and second connectors are respectively attached to the non-base portion side circuit board, and the first and second connectors of the first and second connectors are attached to the peripheral wall portion of the base member. First and second connector body fitting portions in which the male connector body and the female connector body of the male connector half and the female connector half are held in a fitted state are radially opposed to each other. Formed at the location , Photoelectric encoder, wherein the non-base-side circuit board in the peripheral wall portion is mounted in said base member.