JP2006023226A - Optical rotary encoder and assembling method of optical rotary encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical rotary encoder capable of easily and highly accurately adjusting positioning in the XY axial directions. <P>SOLUTION: This optical rotary encoder has a housing 7 having a through-hole 7a for penetrating a shaft 11, and an installation seat 1 for forming a storage part 1c for storing a light emitting part 2 on a main surface 1b fitted to the housing 7 and orthogonal to the shaft 11 and forming an installation surface 1d of a fixing scale 5 arranged so as to cover the storage part 1c in a part of the main surface 1b. At least any one of the housing 7 and the installation seat 1 has at least any one of a cylindrical inner peripheral surface and a cylindrical outer peripheral surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical rotary encoder used for detecting a rotational position of a servo system connected to a rotating shaft and an assembling method thereof, and more particularly, to an encoder structure and assembling which can be assembled easily and accurately. It is about the improvement of the method.

  FIG. 12 is a schematic diagram showing an assembling method of a conventional optical rotary encoder. As shown in FIG. 12, in the conventional assembling method, the shaft 11, two bearings 12 and 16, the housing 7, the preload spring 17 and the shaft coupling 15 (the shaft coupling and here also serves as a bearing presser). Are combined and fixed together with an adhesive or the like, and then the pulse disk 18 is fixed to the end of the shaft 11 with an adhesive or the like to assemble the first intermediate assembly 20. The housing 7 is formed with a storage hole 7d penetrating in the axial direction for storing the second intermediate assembly later.

  Then, with respect to the first intermediate assembly 20, as shown in FIG. 13, a light emitting component mounting seat (hereinafter referred to as a mounting seat) 21 as a mounting seat, a light emitting element 2 and a fixed scale 5 as light emitting components, A second intermediate assembly 19 constructed by mounting is prepared. The fixed scale 5 is attached to one side surface of the mounting seat 21 so as to cover the light emitting port of the light emitting element 2. Then, the second intermediate assembly 19 is inserted into the storage hole 7d formed in the housing 7 of the first intermediate assembly 20 from the direction opposite to the pulse disk 18 as shown by the arrow in FIG. To do. The storage hole 7d is formed larger than the second intermediate assembly 19 so that a predetermined gap is formed around when the second intermediate assembly 19 is inserted.

  After that, as shown in FIG. 14, the position in the XY axis direction is adjusted while maintaining the position in the Z axis direction with the gap sheet 23. Here, the Z-axis direction is a direction perpendicular to the main surface of the pulse disk 18, and the XY-axis direction is a direction in a plane parallel to the main surface of the pulse disk 18. Then, when the mounting seat 21 is adjusted to a predetermined position, as shown in FIG. 15, an adhesive 27 is filled around the mounting seat 21 and the mounting seat 21 is fixed.

  Here, in order to obtain a highly accurate encoder, first, position adjustment in the XY axis direction (position adjustment in a plane parallel to the main surface of the fixed scale 5 with respect to the pulse disk 18) must be performed with high accuracy. . Further, the position adjustment in the Z-axis direction (gap adjustment between the fixed scale 5 and the pulse disk 18) is performed with high accuracy, so that a more accurate encoder can be obtained (for example, Patent Document 1). reference).

JP-A-4-140611

  As described above, in order to obtain a highly accurate encoder, accurate positioning in the Z-axis direction between the fixed scale 5 and the pulse disk 18 is also necessary. Accurate positioning in the XY axis direction is necessary. In this regard, in the conventional method, first, the positioning adjustment in the Z-axis direction and the XY-axis direction must be performed simultaneously. Furthermore, in a very delicate state in which the position adjustment of the intermediate assembly 19 is completed, the intermediate assembly 19 must be accurately supported until the adhesive 27 is solidified. For this reason, the position adjustment work is very difficult, and it has not been easy to make the encoder highly accurate.

  The present invention has been made in view of the above, and enables the positioning adjustment of the fixed scale in the XY axis direction to be performed independently, and the positioning adjustment in the XY axis direction can be easily and highly accurately performed. An object is to obtain an optical rotary encoder and an assembly method of the optical rotary encoder.

  In order to solve the above-described problems and achieve the object, an optical rotary encoder according to the present invention includes a shaft, a pulse disc attached to the shaft, and a housing so as to face the pulse disc. A housing having a through-hole through which a shaft passes, in an optical rotary encoder having a fixed scale, a light emitting component and a light-receiving component arranged to face each other on both sides of the pulse disk and the fixed scale; A mounting part that fits into the housing and stores a light emitting component on the main surface orthogonal to the shaft, and the mounting surface of the fixed scale that is arranged to cover the storage part is formed on a part of the main surface And at least one of the housing and the mounting seat has at least one of a cylindrical inner peripheral surface and a cylindrical outer peripheral surface. And said that you are.

  According to the present invention, since the mounting surface of the fixed scale is first formed on a part of the main surface of the mounting seat, the positioning adjustment of the fixed scale in the XY axis direction and the positioning in the Z axis direction can be performed separately. it can. That is, the positioning adjustment in the XY axis direction can be performed independently. Furthermore, since at least one of the housing and the mounting seat has at least one of the cylindrical inner peripheral surface and the cylindrical outer peripheral surface, the mounting seat or the mounting seat fitted to the housing is used as a chuck device, for example. Is fixed with the shaft center axis as a positioning reference, and the fixed scale is shifted in the XY directions on the main surface perpendicular to the shaft of the mounting seat with respect to this positioning reference. Since the position can be adjusted, the positioning adjustment of the fixed scale in the XY axis direction can be performed easily and with high accuracy.

  Embodiments of an optical rotary encoder and an assembly method of the optical rotary encoder according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a longitudinal sectional view of a main body of an embodiment of an optical rotary encoder according to the present invention. FIG. 2 is a front view of the light emitting component mounting seat. 3 is a cross-sectional view taken along the line II-II in FIG. In FIG. 1, a main body 100 of an optical rotary encoder includes a light emitting component mounting seat (hereinafter referred to as mounting seat) 1, a housing 7, first and second bearings 12 and 16, a shaft 11, a shaft coupling 15, and a pulse disc 18. Have.

  The housing 7 has a substantially disk shape, and a bearing housing hole 7a is formed at the center. A first bearing 12 and a second bearing 16 are press-fitted into the housing hole 7a so that the central axis of the housing 7 coincides. A shaft 11 is rotatably inserted into the bearings 12 and 16 with the housing 7 and the center axis aligned with each other. On one side of the housing 7, a boss portion 7b is formed so as to surround the bearing housing hole 7a. The boss portion 7b is fitted with an annular mounting seat 1 having a circular circumferential cross section. The mounting seat 1 is further fastened to the housing 7 by screws 9 after being fitted to the boss 7b.

  In FIG. 2, an engagement hole 1 a for fitting into the boss portion 7 b of the housing 7 is formed in the central portion of the mounting seat 1 that forms an annular shape. The engagement hole 1a has a cylindrical inner peripheral surface. Four light emitting component mounting holes 1c serving as storage units for storing the light emitting elements 2 are drilled at predetermined positions in the circumferential direction of the main surface 1b facing the pulse disk 18 of the mounting seat 1. The light emitting element 2 is accommodated in the light emitting component mounting hole 1c. The surface of the main surface 1b in the vicinity of the opening of the light emitting component mounting hole 1c is the mounting surface 1d of the fixed scale 5 as shown by the dotted line in FIG. (The dotted line in the figure simply shows the area.) The fixed scale 5 is disposed on the mounting surface 1d so as to cover the four light emitting component mounting holes 1c, and is attached to the mounting surface 1d of the mounting seat 1. A screw hole 1e for fastening the mounting seat 1 to the housing 7 is formed at a position 90 degrees away from the light emitting component mounting hole 1c in the circumferential direction. The mounting seat 1 is made of a resin such as PPS (polyphenylene sulfide) or PBT (polybutylene terephthalate). The light emitting element 2 does not need to be positioned with high accuracy with respect to the mounting seat 1 and is simply inserted and attached to the light emitting component mounting hole 1c. Specifically, the light emitting element 2 is a light emitting element diode. The fixed scale 5 is formed with a slit window group made up of a large number of slits (not shown).

  Returning to FIG. 3, a shaft coupling 15 is attached to an end of the shaft 11 on the side connected to, for example, a rotating shaft of a machine tool. A pulse disk 18 is fixed to the opposite end of the shaft 11. The pulse disk 18 extends so as to cover the entire surface on one side of the housing 7. A large number of slits (not shown) are formed in the pulse disk 18 over the entire circumference at radial positions facing the slit window group formed in the fixed scale 5.

  A light receiving element 25 as a light receiving component is supported by a stay 26 at a position facing the fixed scale 5 with the pulse disk 18 interposed between the optical rotary encoder main body 100 thus configured. ing. These devices are housed in a cover (not shown) to form an optical rotary encoder.

  Next, the operation of the optical rotary encoder will be described. When the power is turned on and the light emitting element 2 emits light, the light passes through the slit window group formed in the fixed scale 5, and then passes through the slit window of the pulse disk 18 to irradiate the light receiving element 25. At this time, the light receiving element 25 generates a current proportional to the amount of light. Here, when the shaft 11 rotates, the light emitted from the light emitting element 2 is repeatedly passed and blocked by the slit window of the pulse disk 18, and the light emission current of the light receiving element 25 becomes a pseudo sine wave. The fixed scale 5 cuts off the oblique incident light emitted from the light emitting element 2 and allows only the effective parallel component light to pass therethrough, thereby increasing the peak value of the emitted radio wave. This current is converted into a voltage by a waveform shaping circuit, shaped into a pulse waveform and output to the outside.

  Next, a method for assembling the optical rotary encoder main body 100 will be described. Prior to that, the intermediate assembly will be described. FIG. 4 shows an intermediate process of the assembly process of the optical rotary encoder. As shown in FIG. 4, the first assembly 30 and the second assembly 40 as an intermediate assembly are combined into a third assembly 50. In the first assembly 30, the mounting seat 1 on which the light emitting element 2 (not shown) and the fixed scale 5 are mounted is fastened to the housing 7 with screws 9. The second assembly 40 is formed by press-fitting the first bearing 12 into the shaft 11. A combination of the first assembly 30 and the second assembly 40 is referred to as a third assembly 50. The main body 100 is manufactured by attaching the pulse disk 18 to the third assembly 50. Then, a light receiving element 25 as a light receiving component, a stay 26 that supports the light receiving element 25, and a cover (not shown) are attached to the main body 100, and an optical rotary encoder is manufactured (see FIG. 1).

Next, an assembling method of the main body 100 of the optical rotary encoder will be described.
[1 step: Light emitting component fixing step]
In the light emitting component fixing step, which is one step, the light emitting element 2 as the light emitting component is attached to the mounting seat 1. The light emitting element 2 does not need to be positioned with particularly high accuracy, and is simply inserted and attached to the light emitting component mounting hole 1c.

[Two steps: fixed scale fixing step]
FIG. 5 is a schematic diagram for explaining the fixed scale fixing step. In the fixed scale fixing step, which is the second step, first, the mounting seat 1 is chucked on a support device that can position and support the center of a member such as the chuck device 3. That is, as shown in FIG. 5A, the mounting seat 1 is set in the chuck device 3 in a state where the claw 3a is closed in the direction of the arrow A, and the claw 3a in the direction of the arrow B as shown in FIG. Is opened to support the mounting seat 1 so that the central axis of the mounting seat 1 and the central axis of the chuck device 3 coincide with each other. Note that the device for positioning and supporting the mounting seat 1 is not necessarily the chuck device 3, and the mounting seat 1 is in contact with the cylindrical inner peripheral surface of the engagement hole 1 a of the mounting seat 1 so that the central axis serves as a positioning reference. Any device can be used as long as it can be positioned and supported.

  Next, in a state where the mounting seat 1 is chucked on the chuck device 3, the fixed scale 5 is fixed to the mounting seat 1 so as to be in a predetermined position with respect to the center of the chuck device 3. The fixed scale 5 is disposed and attached to the mounting surface 1d so as to cover the four light emitting component mounting holes 1c. At this time, the fixed scale 5 is positioned by being guided by a positioning jig (not shown). For example, the positioning jig is supported by the chuck device 3 to position the fixed scale 5 at a predetermined position with respect to the center of the chuck device 3. Specifically, a center mark 3b is imprinted at the center of the chuck device 3, and the positioning jig has an accurate positional relationship between the center mark 3b and the adjustment mark 6 imprinted on the fixed scale 5 in the design dimension. As described above, the fixed scale 5 is slid on the mounting surface 1d to position the fixed scale 5. Regarding the positioning of the fixed scale 5, in addition to using such a positioning jig, a method of making the positions of both marks accurate by image processing using a computer is also effective.

[3 steps: Mounting seat fixing step]
FIG. 6 is a schematic diagram for explaining the mounting seat fixing step. In the mounting seat fixing step, which is the third step, the mounting seat 1 is engaged with the cylindrical outer peripheral surface of the boss portion 7b of the housing 7 by contraction force when the mounting seat 1 is expanded by applying heat and then cooled and contracted. The cylindrical inner peripheral surface of the hole 1a is closely attached and positioned and fixed.

  The mounting seat 1 which is placed in an environment of 50 ° C. to 60 ° C. for about 30 minutes and heated to an appropriate temperature and expanded is mounted on a housing 7 at room temperature and left to stand. Then, when the mounting seat 1 returns to normal temperature, the mounting seat 1 is fastened to the housing 7 with screws 9.

  By assembling the mounting seat 1 to the housing 7 by such a method, the cylindrical inner peripheral surface of the engagement hole 1a of the mounting seat 1 is in close contact with the cylindrical outer peripheral surface of the boss portion 7b of the housing 7, and the central axes of both are aligned. . That is, the mounting seat 1 is fixed to the housing 7 in a state where the support state by the two-step chuck device 3 is reproduced. For this reason, the center axis of the mounting seat 1 and the housing 7 coincide with each other, and the fixed scale 5 is accurately positioned and fixed at the position according to the design dimension with respect to the center of the housing 7. In this way, the first assembly 30 is assembled. Note that the same effect can be obtained even if the housing 7 is cooled and contracted instead of warming the mounting seat 1 and the both are fitted together, and can be assembled by the same assembling method.

  As described above, the optical rotary encoder according to the present embodiment has the housing 7 and the mounting seat 1, and the housing 7 has a bearing accommodation hole (through hole) 7 a that forms a cylindrical surface through which the shaft 11 passes. The mounting seat 1 is fitted to the housing 7, and a light emitting component mounting hole 1c for housing the light emitting element 2 as a light emitting component is formed in the main surface 1b orthogonal to the shaft 11, and covers the light emitting component mounting hole 1c. Since the mounting surface 1d of the fixed scale 5 arranged in this way is formed on a part of the main surface 1b, the positioning adjustment of the fixed scale 5 in the XY-axis direction and the positioning in the Z-axis direction can be performed separately. it can. Furthermore, since at least one of the mounting seat 1 and the housing 7 has a cylindrical inner peripheral surface, the cylindrical inner peripheral surface is centered on the shaft using a central axis positioning support device such as the chuck device 3. The shaft can be fixed with the positioning reference. That is, only the mounting seat 1 can be fixed using the chuck device 3, or the housing 7 in which the mounting seat 1 is fitted can be fixed using the chuck device 3. In this state, the position of the fixed scale 5 can be adjusted while sliding in the XY direction on the main surface 1b orthogonal to the shaft 11 of the mounting seat 1 with respect to the positioning reference. Therefore, the positioning adjustment in the XY axis direction can be performed easily and with high accuracy.

  The fixed scale 5 is positioned and fixed to the housing 7 via the mounting seat 1, and the mounting seat 1 is supported by a positioning support device so as to form an annular shape and the central axis serves as a positioning reference. In this state, the fixed scale 5 is positioned and fixed at a predetermined position with respect to the central axis, and the mounting seat 1 is expanded by applying heat, and then the boss of the housing 7 is contracted by the contraction force when it cools and contracts. The inner peripheral surface of its own engagement hole 1a is brought into close contact with the cylindrical outer peripheral surface of the portion 7b and is positioned and fixed. Therefore, the fixed scale 5 can be easily positioned and fixed with respect to the central axis of the housing 7 in the XY direction plane. As a result, the assembling work is easy and the optical rotary encoder can be assembled with high accuracy.

  Further, since the positioning support device used in this fixed scale fixing step is the chuck device 3 that chucks the cylindrical inner peripheral surface of the engagement hole 1a of the mounting seat 1, the central axis of the mounting seat 1 is used as a positioning reference. Thus, it can be positioned and supported easily.

  Furthermore, since the mounting seat 1 is made of resin, it can be fitted into the housing 7 even when heated at a low temperature with a large expansion / contraction ratio with respect to heat.

  In the present embodiment, the light emitting element 2 as the light emitting component is attached to the mounting seat 1 in the light emitting component fixing step which is one step. However, since the light emitting element 2 does not need to be positioned with particularly high accuracy as described above, the light emitting element 2 may be attached after the fixed scale fixing step which is the two steps. Further, for maintenance that enables replacement of the light emitting element 2 that has expired due to the end of its life, for example, when the housing 7 has a structure in which a hole for replacing the light emitting element 2 is provided, light emission is performed after the mounting seat fixing process, which is the third process. The element 2 may be attached.

  In this embodiment, in the fixed scale fixing step, which is a two-step process, after the fixed scale 5 is attached to the mounting seat 1, the mounting seat 1 is fixed to the housing 7. After fixing to the housing 7, the housing 7 may be fixed by the chuck device 3, and the fixed scale 5 may be fixed to the mounting seat 1 in this state. By adopting such an order, the chuck device 3 grips the bearing housing hole 7a of the metal housing 7, so that the deformation due to the pressing force of the claw is smaller than when the resin mounting seat 1 is gripped, and the chuck device 3 is more accurate. can do. Further, after fixing the mounting seat 1 to the housing 7 and integrating it, the center of the bearing receiving hole 7a is used as a positioning reference, thereby eliminating the fitting error when the mounting seat 1 is fitted to the housing 7. Therefore, it can be made more accurate.

  Furthermore, in the present embodiment, the storage portion in which the light emitting element 2 as the light emitting component is stored is the light emitting component mounting hole 1c that penetrates the mounting seat 1, but the storage portion of the light emitting element 2 is a through hole. Alternatively, it may be a recess.

[4 steps: Shaft / Jig engagement step]
FIG. 7 is an explanatory view showing the shape of the gap adjustment jig. FIG. 8 is a schematic diagram for explaining the shaft / jig engagement step. In FIG. 7, the gap adjusting jig 8 has a substantially disk shape, and a recess 8d is formed in the center. A shaft contact surface 8a as a reference surface is formed around the opening of the recess 8d. Here, the (assembly) reference plane is a reference plane for assembling a plurality of parts. For example, when two assemblies are combined, the two assemblies are assembled with reference to the same plane. If the two assemblies are combined so that the two reference planes match, the assembly error between the two assemblies will be reduced, but the two assemblies will be assembled with reference to different planes, and the two reference planes will have the specified dimensions. If the two assemblies are combined so that the following relationship is satisfied, an error in making the distance between the two reference surfaces a predetermined dimension is included in the combined product, and therefore the assembly accuracy is lower than the previous one.

  Returning to FIG. 7, a groove 8 c for allowing the fixed scale 5 to escape is formed at a predetermined position in the circumferential direction of the surface 8 b of the gap adjusting jig 8. The gap adjusting jig 8 is a surface that comes into contact with the shaft against the surface 8b so that the positional relationship between the pulse disk 18 and the housing 7 (that is, the pulse disk 18 and the fixed scale 5) is accurate in assembly in a later process. The depth D1 of 8a is produced with very good accuracy.

  In the shaft / jig engagement step, which is the fourth step, the shaft 11 in which the first bearing 12 is press-fitted into the gap adjusting jig 8 as shown in FIG. The reference surface 11 d is engaged with the shaft abutting surface 8 a of the gap adjusting jig 8 so as to be in close contact with the gap adjusting jig 8 and is erected on the gap adjusting jig 8.

[5 steps: third assembly assembly step]
FIG. 9 is a schematic view showing a state of the third assembly assembling process. FIG. 10 is a longitudinal sectional view of the third assembly obtained as a result of the third assembly assembling step. In the third assembly assembling step as the fifth step, the housing 7 of the first assembly 30 is press-fitted into the first bearing 12 of the second assembly 40 engaged with the gap adjusting jig 8, and the preload spring 17 is installed. The third assembly 50 shown in FIG. 10 is assembled by inserting the second bearing 16 and press-fitting the shaft coupling 15 to the end of the shaft 11.

  9, the first assembly 30 is fitted from above in FIG. 9 to the second assembly 40 in a state where the reference surface 11d of the shaft 11 is in contact with the shaft contact surface 8a of the gap adjusting jig 8. . That is, the first assembly 30 moves downward in FIG. 9 while gradually inserting the first bearing 12 into the bearing insertion hole 7 a formed in the housing 7. However, the first assembly 30 never goes down and stops at a position where the main surface 1b of the mounting seat 1 is in close contact with the surface 8b of the gap adjusting jig 8. Here, the positional relationship between the surface 8b and the shaft contact surface 8a is produced with very good accuracy as the depth D1 as described above. Therefore, the accuracy of the depth D1 is directly reflected in the positional relationship between the reference surface 11d of the shaft 11 and the main surface 1b of the mounting seat 1. That is, the shaft 11 is assembled so that the reference surface 11d of the shaft 11 and the main surface 1b of the mounting seat 1 have very good positional accuracy. On the other hand, the fixed scale 5 is stuck on the mounting surface 1 d formed on the main surface 1 b of the mounting seat 1. As a result, the gap D2 between the reference surface 11d of the shaft 11 and the surface of the fixed scale 5 becomes very accurate. Further, since the assembly is performed with the main surface of the mounting seat 1 in contact with the surface 8b of the gap adjusting jig 8, the shaft 11 is firmly erected vertically and the assembly work is facilitated.

[6 steps: Pulse disk mounting step]
FIG. 11 is a longitudinal sectional view showing a pulse disk attaching step. In the pulse disk attaching step as the sixth step, the gap adjusting jig 8 is removed from the third assembly 50 assembled in the fifth step, and the reference surface 11d of the shaft 11 with which the gap adjusting jig 8 has been engaged so far. The pulse disk 18 is fixed to the surface. By adopting such an assembling method, it is possible to assemble the optical rotary encoder main body 100 in a state where the accuracy of the gap D3 between the main surface of the pulse disk 18 and the surface of the fixed scale 5 is high. That is, the accuracy of the gap D1 manufactured with very good accuracy is copied to the gap D2 and the gap D3 with almost no positioning error of other members. Therefore, as long as the accuracy of the gap D1 of the gap adjusting jig 8 is improved, the positional relationship between the pulse disk 18 and the fixed scale 5 can be made highly accurate.
A light receiving element 25 as a light receiving means, a stay 26 that supports the light receiving element 25, and a cover (not shown) are attached to the main body 100 assembled in this way, and an optical rotary encoder is manufactured (see FIG. 1).

  As described above, in the method of assembling the optical rotary encoder according to this embodiment, the second assembly 40 in which the first bearing 12 is press-fitted into the shaft 11 is used, and the reference surface 11d of the shaft 11 is the gap adjusting jig 8. A shaft / jig engaging step for engaging the shaft with the shaft contact surface 8a, and the third assembly 50 by press-fitting the housing 7 of the first assembly 30 into the first bearing 12 of the second assembly 40. The third assembly 50 is assembled in a state where the reference surface 11d of the shaft 11 and the shaft contact surface 8a of the gap adjusting jig 8 are in contact with each other. The gap D2 between the reference surface 11d of the shaft 11 and the surface of the fixed scale 5 can be assembled with very high accuracy. Since the pulse disc 18 is fixed to the reference surface 11d of the shaft 11 with which the contact surface 8a is in contact, the gap D3 between the main surface of the pulse disc 18 and the surface of the fixed scale 5 is made highly accurate. Can do.

  In addition, after assembling the first assembly 30 including the light emitting component fixing step, the fixed scale fixing step, and the mounting seat fixing step, and assembling the second assembly 40, they are engaged with the gap adjusting jig 8. The order of the shaft and jig engaging step to be performed may be changed.

  As described above, the present invention is suitable for an optical rotary encoder that detects, with high accuracy and high reliability, the absolute position of a rotary coordinate of a rotary shaft used in, for example, a machine tool.

It is a longitudinal cross-sectional view of the main body of the optical rotary encoder concerning this invention. It is a front view of a light emitting component mounting seat. FIG. 4 is a cross-sectional view taken along line II-II in FIG. 3. It is a schematic diagram which shows the intermediate process of the assembly method of an optical rotary encoder. It is a schematic diagram explaining a fixed scale fixing process. It is a schematic diagram explaining an attachment seat fixing process. It is explanatory drawing which shows the shape of a gap adjustment jig. It is a schematic diagram explaining a shaft jig engagement process. It is a schematic diagram which shows the mode of a 1st assembly and 2nd assembly uniting process. It is a longitudinal cross-sectional view of the 3rd assembly obtained as a result of the 1st assembly and 2nd assembly uniting process. It is a longitudinal cross-sectional view which shows a pulse disc attachment process. It is a schematic diagram which shows the assembly method of the conventional optical rotary encoder. It is a schematic diagram which shows a mode that the light emitting component attachment seat is fixed to a housing. It is a schematic diagram which shows a mode that the position adjustment of the light emitting component attachment seat of the XY-axis direction is carried out, hold | maintaining the position of a Z-axis direction with a gap sheet. It is a schematic diagram which shows a mode that it fills with an adhesive agent and fixes a light emitting component attachment seat.

Explanation of symbols

1 Light-emitting parts mounting seat (mounting seat)
1a Engagement hole 1b of mounting seat 1 forming a cylindrical inner peripheral surface 1c Main surface 1c of mounting seat 1 facing the pulse disk 18 and orthogonal to the shaft 11 Light emitting component mounting hole (housing part)
1d Mounting surface 2 of fixed scale 5 on which mounting seat 1 is formed Light-emitting element (light-emitting component)
3 Chuck device (positioning support device)
5 Fixed scale 7 Housing 7a Bearing storage hole (through hole)
7b Boss portion 8 Gap adjustment jig 9 Screw 11 Shaft 11d Reference surface 12 of shaft 11 First bearing 15 Shaft coupling 16 Second bearing 17 Preload spring 18 Pulse disc 25 Light receiving element 26 Stay 30 First assembly 40 Second assembly 50 Third Assembly 100 Main Body

Claims (8)

A shaft, a pulse disk attached to the shaft, a fixed scale fixed to the housing so as to face the pulse disk, and opposite to both sides of the pulse disk and the fixed scale, respectively In an optical rotary encoder having a light emitting component and a light receiving component arranged,
A housing having a through-hole through which the shaft passes;
A housing portion for housing the light emitting component is formed on a main surface that is fitted to the housing and orthogonal to the shaft, and the mounting surface of the fixed scale that is disposed so as to cover the housing portion is a part of the main surface. And a mounting seat formed on the
At least one of the housing and the mounting seat has at least one of a cylindrical inner peripheral surface and a cylindrical outer peripheral surface. An optical rotary encoder, wherein: The optical rotary encoder according to claim 1, wherein a positioning mark is formed on a surface of the fixed scale. The optical rotary encoder according to claim 1, wherein the mounting seat is made of resin. A shaft, a pulse disk attached to the shaft, a fixed scale fixed to the housing so as to face the pulse disk, and arranged opposite to each other on both sides of the pulse disk and the fixed scale. In an assembling method of an optical rotary encoder having a light emitting component and a light receiving component,
A light emitting component fixing step for fixing the light emitting component to an annular mounting seat;
A fixed scale that supports the mounting seat with a positioning support device so that the central axis serves as a positioning reference, and in this state, positions the fixed scale so as to be at a predetermined position with respect to the central axis and fixes the mounting scale to the mounting seat A fixing process;
After fitting and fitting a temperature difference between the two so that the cylindrical inner peripheral surface of the mounting seat fits to the cylindrical outer peripheral surface of the housing, the temperature difference is eliminated to eliminate the temperature difference of the mounting seat on the cylindrical outer peripheral surface of the housing. An assembly method of an optical rotary encoder, comprising: a mounting seat fixing step for fixing the cylinder inner peripheral surface in close contact with each other. After performing a shaft / jig engagement process for engaging the second assembly in which the first bearing is press-fitted into the shaft so that the reference surface of the shaft is in close contact with the reference surface of the gap adjustment jig,
A first assembly housing assembled by the light emitting component fixing step, the fixed scale fixing step, and the mounting seat fixing step is inserted into the first bearing of the second assembly to assemble a third assembly. The method of assembling an optical rotary encoder according to claim 4, further comprising a three-assembly assembly step. The optical rotary encoder according to claim 5, further comprising a pulse disk fixing step of removing the gap adjusting jig from the third assembly and fixing the pulse disk to the reference surface of the shaft. Assembly method. The optical rotary encoder assembling method according to claim 4, wherein the positioning support device used in the fixed scale positioning and fixing step is a chuck device that chucks a cylindrical inner peripheral surface of the mounting seat. . The assembly method of the optical rotary encoder according to any one of claims 4 to 7, wherein the mounting seat is made of resin.

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