JP2016170088A - Mechanism and method for adjusting position of photodetector of optical encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical encoder with a photodetector that can be positionally adjusted easily, without moving a pedestal directly with a hand and using a complicated mechanism using an X-Y table.SOLUTION: A first holder 50 and a second holder 51 are provided to a main body 4 to be independent from a pedestal 1 having a photodetector 2, at both ends 1A and 1B of the pedestal 1. Further, a first screw body 55 and a second screw body 57 are formed in the holders 50 and 51, respectively, so that both edges 55a and 57a are in contact with the ends 1A and 1B of the pedestal 1. Rotating the first and second screw bodies 55 and 57 moves the pedestal 1 along a straight line A right and left to adjust the position of the photodetector 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a position adjusting mechanism and method for a photoreceptor of an optical encoder, and in particular, without directly moving a pedestal by hand as in the prior art and using a complicated mechanism using an XY table, The present invention relates to a new improvement for easily performing fine adjustment of a pedestal.

Conventionally, as a position adjusting mechanism and method for a photoreceptor of this type of optical encoder that has been used, for example, although a literature name is not shown, a manual mechanism shown in FIG. 3 and FIGS. 4 and 5 are used. The positioning mechanism of the light receiving element board | substrate by the XY table disclosed by patent document 1 shown by can be mentioned.
First, what is denoted by reference numeral 1 in FIG. 3 is a pedestal on which a substrate 3 having a light receiving body 2 having a light receiving element is placed. The pedestal 1 is provided on a main body 4 of an apparatus (not shown). .

The relationship between the pedestal 1 disposed on the main body 4 and the first and second fixing screws 5 and 6 is as shown in FIG.
That is, the pedestal 1 is slidably provided with respect to the main body 4, and the first and second fixing screws 5, 6 provided on the first end 1A side and the second end 1B side of the pedestal 1 and The first and second through holes 7 and 8 are both mounted as shown in FIG.
The first and second fixing screws 5 and 6 are respectively inserted into the first and second through holes 7 and 8 formed in the pedestal 1, and the tips of the fixing screws are inserted into the main body 4. Screwed.

In the state described above, the fixing screws 5 and 6 are not sufficiently tightened with respect to the main body 4 so that the position of the base 1 can be finely adjusted. This is a state in which the base 1 can move slightly.
In addition, the hole diameter D of each of the through holes 7 and 8 into which the fixing screws 5 and 6 are inserted is set so that the outer diameter D ₁ of the fixing screws 5 and 6 is D>. Since it is configured to have a relationship of D _1, the pedestal can move by a difference of D−D ₁ with respect to the main body 4 as described above unless the fixing screws 5 and 6 are firmly tightened. It is configured.
That is, each of the through holes 7 and 8 is constituted by a fool hole in terms of a person skilled in the art consisting of a long hole with respect to the fixing screws 5 and 6.

  Therefore, as shown in FIG. 3, with the respective fixing screws 5 and 6 loosened, the pedestal 1 is slightly moved by hand to adjust the light receiving state of the photoreceptor 2, and after the adjustment is completed, Tighten the fixing screws 5 and 6 and fix them.

4 and 5 show another conventional configuration.
That is, what is denoted by reference numeral 1 in FIGS. 4 and 5 is an XY drive mechanism provided in the signal detection unit 3 of the optical rotary encoder 2, and this XY drive mechanism 1 includes an XY drive mechanism. An XY table 4 that is freely movable in the direction is provided.

  First and second magnets 5 and 6 disposed along the two sides 4A and 4B are provided on the two sides 4A and 4B orthogonal to each other of the XY table 4, and the XY table 4 A light receiving element substrate 11 in which at least four light receiving windows 7, 8, 9, 10 are spaced apart from each other and formed in a square shape is provided above.

  The light receiving windows 7, 8, 9, and 10 are each formed in a quadrangle, and a rectangular light receiving center square frame line 12 that connects the light receiving centers 7A, 8A, 9A, and 10A of the light receiving windows 7, 8, 9, and 10 A frame center 13 is formed.

A light-emitting element substrate 14 having the same shape as the light-receiving element substrate 11 (not necessarily the same shape) is fixedly disposed at a position facing the light-receiving element substrate 11 via a support member (not shown).
One light emitting element 15 is provided at the center position of the light emitting element substrate 14, and the optical axis 16 of the light emitting element 15 needs to coincide with the frame center 13.

  The sides 4C and 4D other than the sides 4A and 4B of the XY table 4 are driven by first and second motors 22 and 23 that are servo-driven by first and second servo drivers 20 and 21, respectively. First and second linear motion units 24 and 25 for step-moving (step tracking) the XY table 4 in the X direction and the Y direction are connected.

  First and second Hall elements 30 and 31 are disposed outside the first and second magnets 5 and 6 and at positions facing the magnets 5 and 6, respectively. 31 is configured to be able to detect the position of each of the magnets 5 and 6 by the strength of the magnetic field lines in a state of being close to the magnets 5 and 6.

  The first and second position detection signals 30a and 31a output from the hall elements 30 and 31 are input to the first and second servo drivers 20 and 21, respectively. The first and second position commands 41 and 42 from the control device 40 are configured to be input.

The light quantity data 7a, 8a, 9, 10a output from the light receiving windows 7, 8, 9, 10 is output by the pulse converter 45 as A-phase and B-phase two-phase pulse signals 46 as encoder signals. .
The light quantity data 7a, 8a, 9a, and 10a are input to the A / D converter 47, A / D converted, and then input to the control device 40 as digital signals 47a to 47d. Yes. In FIG. 1, a well-known rotating disk that is rotatably provided between the light receiving element substrate 11 and the light emitting element substrate 14 is not shown.

Next, the operation will be described. First, in the configuration of FIG. 1, after the power is turned on, the optical axis 16 is aligned with the frame center 13 to be in the best position, so that each of the light receiving windows 7-of the light receiving element substrate 11 originally for obtaining the two-phase pulse signal 46 is used. 10 is used as an optical axis positioning sensor.
The light receiving element substrate 11 is mounted on the XY table 4. In the control device 40, digital signals 47 a to 47 d corresponding to the light quantity data 7 a to 10 a from the A / D converter 47 are input to the control device 40. In the control device 40, the position of the XY table 4 is calculated based on the digital signals 47a to 47d and the first and second position commands 41 and 42 are supplied to the servo drivers 20 and 21, respectively.

  The servo drivers 20 and 21 supply the drive signals 20a and 21a to the motors 22 and 23 based on the position detection signals 30a and 31a from the hall elements 30 and 31, respectively. The frame center 13 can be controlled to be aligned with the optical axis 16 by performing a predetermined movement in units of microns along the X direction and the Y direction.

Next, step tracking for actual automatic optical axis correction of the optical rotary encoder described above is as follows.
That is, as described above, the light receiving element substrate 11 is moved by the micron unit at regular intervals in the X direction and the Y direction using the XY table 4, and each light receiving window 7˜ The control unit 40 describes the light amount data 7a to 10a detected from 10 and the position detection signals 30a to 31a.

Next, all the above-mentioned data stored in the control device 40 are analyzed, and the positions in the X and Y directions where the light quantity data 7a to 10a from the respective light receiving windows 7 to 10 are all maximized are detected by the position detection signals. Detection is performed at 30a and 31a.
That is, if the frame center 13 and the optical axis 16 coincide with each other, the light quantity data 7a to 10a from the light receiving windows 7 to 10 are the maximum, that is, the light quantity data 7a to 10a are the most equal to each other (positions substantially equal to each other). ).

JP 2010-151636 A

Since the conventional optical encoder position adjusting mechanism of the optical encoder is configured as described above, the following problems exist.
That is, in the case of the first conventional example shown in FIG. 3, since the pedestal 1 is moved by hand with respect to the main body 4 and fixed with the fixing screws 5 and 6, precise position adjustment is difficult.
In the case of the conventional example shown in FIGS. 4 and 5, the control configuration of the CPU 40 and the like for biaxially controlling the light receiving element substrate 11 in the XY direction is complicated, and there is a problem in cost in general use. It was.

  The present invention has been made to solve the above problems, and in particular, without directly moving the pedestal by hand as in the prior art and without using a complicated mechanism using an XY table. It is an object of the present invention to provide a position adjustment mechanism and method for a light receiving body of an optical encoder that can easily perform fine adjustment of a pedestal.

  The position adjusting mechanism of the light receiving body of the optical encoder according to the present invention receives light from the light emitting body of the optical encoder by a light receiving body provided on a pedestal that can reciprocate along the linear direction on the main body. In the optical encoder photoconductor position adjusting mechanism, the first through hole and the second through hole arranged on both ends of the pedestal, and the first through hole provided in the first through hole and screwed into the main body. 1 fixing screw, a second fixing screw provided in the second through-hole and screwed to the main body, and provided on the main body and positioned on both ends of the pedestal independently of the pedestal A first screw body, a first screw body screwed into the first screw hole of the first holding body, the tip of which contacts the first end of the pedestal, and a second of the second holding body. A second screw body screwed into the screw hole and having its tip abutting against the second end of the pedestal The light receiving body is moved along the linear direction via the pedestal by the rotation of the first screw body or the second screw body, and the hole diameter of the first through hole Is larger than the outer diameter of the first fixing screw, the hole diameter of the second through hole is larger than the outer diameter of the second fixing screw, and light from the light emitter of the optical encoder In the method of adjusting the position of the light receiver of the optical encoder that is received by the light receiver provided on the pedestal that is reciprocally movable along the linear direction on the main body, the second is disposed on both ends of the pedestal. A first through hole and a second through hole; a first fixing screw provided in the first through hole and screwed into the main body; and a second fixing provided in the second through hole and screwed into the main body. Screw and the pedestal on the both ends of the pedestal provided on the main body Are independently positioned first and second holding bodies, a first screw body screwed into a first screw hole of the first holding body and having a tip abutting against the first end of the pedestal, and the first 2 using a second screw body that is screwed into the second screw hole of the holding body and whose tip abuts against the second end of the pedestal, and by rotating the first screw body or the second screw body, In this method, the photoreceptor is moved along the linear direction via the pedestal, and the diameter of the first through hole is larger than the outer diameter of the first fixing screw. In this method, the hole diameter is larger than the outer diameter of the second fixing screw.

Since the optical encoder position adjusting mechanism and method according to the present invention are configured as described above, the following effects can be obtained.
That is, the light receiving member position adjusting mechanism of the optical encoder configured to receive light from the light emitting member of the optical encoder by a light receiving member provided on a base that is reciprocally movable along a linear direction on the main body, and In the method, a first through hole and a second through hole disposed on both ends of the pedestal, a first fixing screw provided in the first through hole and screwed into the main body, and the second through hole A second fixing screw provided on the main body and screwed on the main body; first and second holding bodies provided on the main body and positioned independently of the pedestal on the both end sides of the pedestal; A first screw body screwed into a first screw hole of one holding body and a tip of the first screw body coming into contact with the first end of the pedestal; and a tip screwed into a second screw hole of the second holding body; A second screw body abutting against the second end of the first screw body or the front By moving the light receiver along the linear direction through the pedestal by the rotation of the second screw body, precise position adjustment of the light receiver can be easily performed only by the rotation of the screw body. The time required for position adjustment can be greatly shortened, and the position adjustment of the photoreceptor of the encoder attached to the apparatus can be facilitated.
Further, the hole diameter of the first through hole is larger than the outer diameter of the first fixing screw, and the hole diameter of the second through hole is larger than the outer diameter of the second fixing screw. Can be freely set, and the positioning of the photoreceptor can be freely adjusted.

It is a top view which shows the position adjustment mechanism of the photoreceptor of the optical encoder by this invention. It is sectional drawing of the principal part of FIG. It is a top view which shows the position adjustment mechanism of the light receiver of the conventional optical encoder. It is a block diagram which shows the light reception adjustment mechanism of the light receiving element of the conventional optical encoder. It is a block diagram which shows the principal part of FIG.

  The position adjustment mechanism and method of the optical encoder of the optical encoder according to the present invention includes a pair of screws without directly moving the pedestal by hand as in the prior art and without using a complicated mechanism using an XY table. It is a simple fine adjustment of the pedestal using the body.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a light receiving body position adjusting mechanism and method of an optical encoder according to the present invention will be described with reference to the drawings.
2 and FIG. 3 of the conventional example will be described using the same reference numerals, and the configuration of FIG. 2 used in the conventional example is the same as the configuration of FIG. 1 and FIG. 2 has the configuration of the fixing screws 5 and 6 and the through holes 7 and 8, and the configuration of FIG. 2 is used for the configuration of FIG.

In FIG. 1, what is indicated by reference numeral 1 is a pedestal that is slidably mounted on a main body 4 of the apparatus or the like. On this pedestal 1, a substrate 3 having a photoreceptor 2 is fixed at a predetermined position. ing.
A first through hole 7 and a first fixing screw 5 are provided on the first end 1A side of the pedestal 1, and a second through hole 8 and a second fixing screw 6 are provided on the second end 1B side of the pedestal 1. Is provided.

The configurations of the first and second fixing screws 5 and 6 and the first and second through holes 7 and 8 are the same as the configuration of FIG. 2 described above. The description is omitted.
On the first end 1A side and the second end 1B side of the pedestal 1, first and second holding bodies 50, 51 disposed on the main body 4 are fixed by a pair of mounting screws 52, 53, and Each holding body 50, 51 is disposed with a gap G away from the first end 1A and the second end 1B.

A first screw hole 54 is formed in the first holding body 50, and a first screw body 55 is screwed into the first screw hole 54, and a tip 55 a of the first screw body 55 is formed in the first screw body 55. It is in contact with one end 1A.
A second screw hole 56 is formed in the second holding body 51, and a second screw body 57 is screwed into the second screw hole 56, and a tip 57a of the second screw body 57 is It abuts on the second end 1B.

In the configuration of FIG. 1 described above, light emitted from a light emitting portion of an encoder (not shown) is irradiated to the light receiving body 2 through a slit (not shown), and in this state, the first screw body 55 and the second screw body 56 are passed through. When rotated, the pedestal 1 can be finely moved along the linear direction A.
During the fine movement of the pedestal 1 (within the range of the through holes 7 and 8), the screw bodies 55 and 57 are fixed with a potting agent or the like at a place where the encoder signal output from the light receiving body 2 is the highest output. be able to.

  Although not shown in the configuration of FIG. 1, when the configuration of FIG. 1 is stacked in a cross shape, a mechanism for adjusting the position in the biaxial direction, which is the XY direction, can be obtained.

The gist of the position adjusting mechanism and method of the light receiving body of the optical encoder according to the present invention is as follows.
In other words, the light from the light emitter of the optical encoder is received by the light receiver 2 provided on the pedestal 1 that can reciprocate along the linear direction A on the main body 4. In the position adjustment mechanism, a first through hole 7 and a second through hole 8 disposed on both ends 1A and 1B side of the pedestal 1 and a first screw provided in the main body 4 provided in the first through hole 7. The fixing screw 5, the second fixing screw 6 provided in the second through hole 8 and screwed to the main body 4, and the both ends 1 </ b> A and 1 </ b> B of the pedestal 1 provided on the main body 4 on the side of the both ends First and second holding bodies 50 and 51 that are positioned independently of the pedestal 1 and a first screw hole 54 of the first holding body 50 that is screwed into the first end 1 </ b> A of the pedestal 1. Are screwed into the first screw body 55 abutting on the second screw hole 56 and the second screw hole 56 of the second holding body 51. A second screw body 57 that abuts against the second end 1B of the pedestal 1, and the rotation of the first screw body 55 or the second screw body 57 causes the above-mentioned via the pedestal 1. A light receiving body position adjusting mechanism and method for an optical encoder, wherein the light receiving body 2 is moved along the linear direction A, and the hole diameter D of the first through hole 7 is the first diameter of the first through hole 7. 2. The optical device according to claim 1, wherein the outer diameter D ₁ of the first fixing screw 5 is larger than the outer diameter D of the second fixing screw 6. It is the position adjustment mechanism and method of the photoreceptor of an encoder.

  According to the optical encoder light receiving member position adjusting mechanism and method of the present invention, the light receiving member can be easily and highly accurately adjusted by changing the protruding position of the tip of the screw body provided on the pair of holding members. It can be positioned at the optimum position.

DESCRIPTION OF SYMBOLS 1 Base 1A 1st end 1B 2nd end 2 Photoreceptor 3 Board | substrate 4 Main body 5,6 1st, 2nd fixing screw 7,8 1st, 2nd through-hole 50 1st holding body 51 2nd holding body 52,53 Mounting screws 54 and 56 First and second screw holes 55 and 57 First and second screw bodies 55a and 57a Tip A Linear direction D Hole diameter D ₁ Outer diameter G Gap

Claims (4)

An optical system that receives light from the light emitter of the optical encoder by the light receiver (2) provided on the base (1) that can reciprocate along the linear direction (A) on the main body (4). In the position adjustment mechanism of the photoreceptor of the encoder,
A first through hole (7) and a second through hole (8) disposed on both ends (1A, 1B) side of the pedestal (1), and the main body (4) provided in the first through hole (7). A first fixing screw (5) screwed in the second through hole (8) and a second fixing screw (6) screwed in the main body (4);
First and second holding bodies (50, 51) provided on the main body (4) and positioned independently of the pedestal (1) on the both ends (1A, 1B) side of the pedestal (1); A first screw body (55) screwed into a first screw hole (54) of the first holding body (50) and having a tip (55a) abutting against the first end (1A) of the pedestal (1); The second screw body (57) which is screwed into the second screw hole (56) of the second holding body (51) and whose tip (57a) abuts on the second end (1B) of the base (1). And comprising
A structure in which the light receiving body (2) is moved along the linear direction (A) via the base (1) by the rotation of the first screw body (55) or the second screw body (57); An optical encoder photoconductor position adjusting mechanism characterized by the above. The hole diameter (D) of the first through hole (7) is larger than the outer diameter (D ₁ ) of the first fixing screw (5), and the hole diameter (D) of the second through hole (8) is the first diameter. 2. The light receiving body position adjusting mechanism of an optical encoder according to claim 1, wherein the position is larger than an outer diameter (D) of the fixing screw (6). An optical system that receives light from the light emitter of the optical encoder by the light receiver (2) provided on the base (1) that can reciprocate along the linear direction (A) on the main body (4). In the method of adjusting the position of the photoreceptor of the encoder,
A first through hole (7) and a second through hole (8) disposed on both ends (1A, 1B) side of the pedestal (1), and the main body (4) provided in the first through hole (7). A first fixing screw (5) screwed in the second through hole (8) and a second fixing screw (6) screwed in the main body (4);
First and second holding bodies (50, 51) provided on the main body (4) and positioned independently of the pedestal (1) on the both ends (1A, 1B) side of the pedestal (1); A first screw body (55) screwed into a first screw hole (54) of the first holding body (50) and having a tip (55a) abutting against the first end (1A) of the pedestal (1); The second screw body (57) which is screwed into the second screw hole (56) of the second holding body (51) and whose tip (57a) abuts on the second end (1B) of the base (1). And
By rotating the first screw body (55) or the second screw body (57), the light receiver (2) is moved along the linear direction (A) via the base (1). A method of adjusting the position of a photoreceptor of an optical encoder, characterized in that: The hole diameter (D) of the first through hole (7) is larger than the outer diameter (D ₁ ) of the first fixing screw (5), and the hole diameter (D) of the second through hole (8) is the first diameter. 4. The method of adjusting the position of a light receiving body of an optical encoder according to claim 3, wherein the outer diameter (D) of the fixing screw (6) is larger.

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