JPH04262Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a manual optical rotary encoder provided with light receiving and emitting elements, and particularly relates to an optical rotary encoder that generates a plurality of pulse signals.

<Prior art> Figures 3 to 8 are explanatory diagrams showing a conventional optical rotary encoder. Figure 3 is an exploded perspective view showing the overall configuration, and Figure 4 is an exploded perspective view showing the correspondence between a code board and a circuit board. FIG. 5 is an explanatory diagram showing the click mechanism, FIG. 6 is an exploded perspective view showing the roller and support member that constitute the click mechanism, and FIG. 7 shows the back side of the first code plate. The figure shown in FIG. 8 is a view showing the back side of the second code plate.

In FIG. 3, 1 is a cover forming an outer shell;
2 and 3 are a first code plate and a second code plate, respectively, which are arranged coaxially and relatively rotatably opposite each other.
4 is an inner shaft fixed to the first code plate 2, 5 is an outer shaft fixed to the second code plate 3, and the inner shaft 4 is rotatably arranged within the outer shaft 5. There is. As shown in FIGS. 4 and 7, the first code plate 2 has a reflective part 6 made of metal along the circumferential direction on the surface opposite to the second code plate 3, and a non-reflective part 6 set in black. Reflecting portions 7 are formed alternately, and recessed portions 8 and convex portions 9 are formed on the outer periphery. In addition, the second code plate 3, as shown in FIGS. 4 and 8,
The first code plate 2 has through-holes, that is, a first window 10 and a second window 11, which are approximately the same size as the reflective parts 6 and the non-reflective parts 7 at positions corresponding to the reflective parts 6 and the non-reflective parts 7. , it also has a reflective window 12 made of metal. Furthermore, it has a reflective part 13 made of metal and a non-reflective part 14 set in black along the circumferential direction including the first window 10 and the second window 11, and has a heart-shaped grooved cam 15. There is.

16, 17, 18 shown in FIG. 3 are the first, second,
The third light receiving/emitting element is arranged so as to be able to face the first window 10, second window 11, and reflection window 12 of the second code plate 3, respectively. 19 is a holder for holding these light receiving and emitting elements 16, 17, 18, 20
A slider is slidably provided on this holding body 19 and has a square through hole 21. This slider 20 has a pin 22 on its upper part that engages with the edge of the grooved cam 15 of the second code plate 3 mentioned above. 2
Reference numeral 3 denotes a spring whose one end is attached to the holder 19 and the other end is attached to the slider 20, which urges the pin 22 to engage with the tip 24 of the grooved cam 15 shown in FIG. .

Reference numeral 25 shown in FIG. 3 is a circuit board to which the holder 19 is attached, and the inner shaft 4 of the first code plate 2 and the outer shaft 5 of the second code plate 3 are arranged in the center.
has a shaft hole 26 into which it is rotatably inserted. Further, 27 shown in FIG. 3 is a roller made of, for example, rubber that engages with the concave portion 8 and convex portion 9 of the first code plate 2, and 28 is a support member that rotatably supports this roller 27. , 29 are pillars that swingably support the support member 28;
Reference numeral 30 shown in FIG. 5 is a spring that biases the support member 28 so that the roller 27 comes into contact with the recess 8 and the projection 9.

The support member 28 described above is made of metal,
As shown in FIG. 6, it has a hole 32a into which a metal shaft 31 of the roller 27 is rotatably inserted.

In the optical rotary encoder constructed in this way, in the set state, the inner shaft 4 of the first code plate 2 and the outer shaft 5 of the second code plate 3 shown in FIG. The pin 2 is inserted into the shaft hole 26 of the circuit board 25 through the through hole 21 of the pin 20.
2 is engaged with the tip 24 of the grooved cam 15, and as shown in FIG.
The first window 10, the second window 11, and the reflective window 12 of the second code plate 3 are covered with the first light emitting/receiving element 16 and the second light emitting/receiving element 1, respectively.
7. Located opposite to the third light receiving/emitting element 18. In this set state, light is projected from the first light receiving/emitting element 16, the second light receiving/emitting element 17, and the third light receiving/emitting element 18 toward the second code plate 3 and the first code plate 2. , when the inner shaft 4 is rotated and the first code plate 2 is rotated, the pin 2
2 is engaged with the tip 24 of the grooved cam 15, the second code plate 3 is held stationary, and as a result, the light projected by the third light receiving/emitting element 18 is transmitted to the second code plate 3.
The reflected light is reflected at the reflective window 12 of the code plate 3, and this reflected light is incident on the third light receiving/emitting element 18, which outputs a high level signal, and the third light receiving/emitting element 18 outputs a high level signal. Light emitting element 16, second
The projected light of the light receiving/emitting element 17 is transmitted to the first window 10, the second
is applied to the reflective part 6 or the non-reflective part 7 of the first code plate 2 through the window 11 of the reflective part 6.
The first light receiving/emitting element 1 receives reflected light from the
6. A pulse signal is output from the second light receiving/emitting element 17. Note that at this time, the first light receiving/emitting element 16,
The first receiving/emitting element 16 and the second receiving/emitting element 17 are arranged so that the second receiving/emitting element 17 outputs pulse signals having different phases. Further, while the first code plate 2 is rotating as described above, the roller 27 sequentially repeats the operation of passing over the convex part 9 of the first code plate 2 and engaging with the concave part 8, thereby causing the click. You can feel it.

Further, contrary to the above, when the first code plate 2 is held stationary, the spring 2 shown in FIG.
When the second code plate 3 is rotated by rotating the outer shaft 5 against the force of Therefore, the projection light of the third light receiving/emitting element 18 is not reflected, a low level signal is output from the third receiving/emitting element 18, and the rotation of the second code plate 3 causes the light projected by the third light receiving/emitting element 18 to be output from the third receiving/emitting element 18. The projected light from the light emitting element 16 and the second light receiving/emitting element 17 is reflected by the reflecting part 13 of the second code plate 3.
Alternatively, the light is applied to the non-reflecting part 14, and the reflected light from the reflecting part 13 is incident thereon, and the first light receiving/emitting element 16 and the second light receiving/emitting element 17 output pulse signals.

In this way, in this optical rotary encoder, by rotating the inner shaft 4 or the outer shaft 5 and selectively rotating the first code plate 2 and the second code plate 3, the respective Can output pulse signals.

<Problems to be solved by the invention> By the way, in the conventional optical rotary encoder configured in this way, the circuit board 25
A holding body 19 is provided separately from the holding body 1.
9, a first light receiving/emitting element 16, a second light receiving/emitting element 17, and a third light receiving/emitting element 18 are arranged on the circuit board 25, and a supporting member 28 supporting the roller 27 by a support 29 is attached on the circuit board 25. Since the structure is configured such that the holding body 19 and the roller 27 are attached to each other, errors are likely to occur, and the position of the first code plate 2 corresponding to the second code plate 3 is likely to occur depending on this error.
It is easy to cause misalignment in positioning.

In other words, when the holder 19 and the roller 27 are each attached to the circuit board 25 with high positioning accuracy, the first code in the set state is as shown in the developed view of FIG. Board 2
The non-reflective portion 7 is the first window 10 of the second code plate 3.
Correctly corresponds to the second code plate 3.
The second window 11 is also correctly positioned to obtain the desired output characteristics. However, as described above, if a deviation occurs in the positioning of the first code plate 2 with respect to the second code plate 3 due to the error in the mounting position between the holder 19 and the roller 27,
As shown in FIG. 10, each of the first window 10 and the second window 11 has a non-reflective portion 7 or a reflective portion 6
is not positioned correctly, which deteriorates the output characteristics.

The present invention was developed in view of the above-mentioned actual situation in the prior art, and its purpose is to eliminate errors in the relative mounting position between the holder that holds the light receiving and emitting elements and the roller that forms the click mechanism. The purpose of the present invention is to provide an optical rotary encoder that can perform the following functions.

<Means for solving the problem> In order to achieve this object, the present invention includes a support part that supports a roller forming a click mechanism on a holder that holds a light receiving/emitting element forming a pulse signal generating part. The configuration includes a holding section for holding the image.

<Operation> Since the present invention is constructed as described above,
The roller is disposed integrally with the holding part of the holding body via the supporting part, and the error in the mounting position between the roller and the holding body with respect to the circuit board is eliminated, so that the first code plate with respect to the second code plate The code plate can be positioned with high precision, and good output characteristics can be obtained.

<Example> Hereinafter, the optical rotary encoder of the present invention will be explained based on the drawings.

FIG. 1 is a plan view showing essential parts of an embodiment of the optical rotary encoder of the present invention, and FIG. 2 is an exploded perspective view showing a roller portion constituting a click mechanism provided in this embodiment.

In FIG. 1, 25 is a circuit board, 19 is a holder disposed on this circuit board 25, 20 is a slider slidably provided on this holder 19, and 1
6, 17, and 18 are respectively formed on a first light receiving/emitting element, a second light receiving/emitting element, and a third light receiving/emitting element; 26 is formed on the circuit board 25;
A shaft hole into which the inner shaft of the code plate and the outer shaft of the second code plate are rotatably inserted; 22 is a pin that engages with a groove cam of the second code plate (not shown); This is equivalent to that shown in Figures 3 and 4. Although not shown, the first code plate having an inner shaft, the second code plate having an outer shaft, etc. are also the same as those shown in FIGS. 3, 4, 7, and 8 described above.

32 is a roller that comes into contact with the recesses and projections of the first code plate (not shown) and constitutes a click mechanism together with these recesses and projections; 33 is the shaft of this roller 32; 3
3 are integrally formed of synthetic resin. Reference numeral 34 denotes a support part, that is, a support member for supporting the roller 32, which is made of synthetic resin and has a notch 35 at its end that can hold the shaft 33 of the roller 32.

Reference numeral 36 denotes a holding part formed by extending a part of the holding body 19, and the support column 29 that swingably supports the support member 34 is erected on this holding part 36. Note that the reference numeral 30 shown in FIG. 1 is a spring similar to that shown in FIGS. is urged to come into contact with the

In the embodiment configured in this manner, the support member 34 that supports the roller 32 is a holder that holds the first light receiving/emitting element 16, the second light receiving/emitting element 17, and the third light receiving/emitting element 18. Since the holding portion 36 extending from the circuit board 19 is held via the support 29, the roller 3 is attached to the circuit board 25.
2 and the holder 19 are eliminated, and as a result, the first code plate can be positioned with high accuracy with respect to the second code plate (not shown) without causing any deviation. , the pulses output according to the projection light from the first light receiving/emitting element 16, the second light receiving/emitting element 17, and the third light receiving/emitting element 18 and the rotation of the first code plate or the second code plate. Good signal output characteristics can be maintained.

Further, in this embodiment, the shaft 33 of the roller 32 is held between the notch 35 of the support member 34, and the shaft 33 of the roller 32 is simply pushed into the notch 35 from the side. That is, the roller 32 can be attached to the support member 34 with a single touch, so the assembly work of the roller 32 is easy and the number of manufacturing steps is small.

In addition, since the support member 34 is made of synthetic resin, the notch 35 can be elastically deformed, and even if the diameter of the shaft 33 of the roller 32 is slightly smaller than the width of the notch 35, the support member 34 is made of synthetic resin. Even if the notch 35 is large, the shaft 33 can be rotatably held by the notch 35, and in such a state, the first
The support member 34 is moved by the force of the spring 30 shown in the figure.
A roller 32 is attached to the outer peripheral edge of the first code plate (not shown).
Since the rollers 32 are urged to come into contact with each other, the roller 32 does not come off the support member 34, and therefore the diameter of the shaft 33 of the roller 32 or the width of the notch 35 is set to a relatively low precision. The production cost is low.

In addition, in this embodiment, since the shaft 33 of the roller 32 and the support member 34 are both made of synthetic resin, frictional noise accompanying the rotation of the roller 32 is not generated due to the synthetic resins rubbing against each other. Therefore, the operator of the rotary encoder does not feel uncomfortable.

<Effects of the invention> Since the optical rotary encoder of the invention is constructed as described above, it is possible to eliminate errors in the mounting position between the roller and the holder that holds the light receiving and emitting elements with respect to the circuit board. This has the effect of ensuring good output characteristics.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the essential parts of an embodiment of the optical rotary encoder of the present invention, FIG. 2 is an exploded perspective view showing the roller portion constituting the click mechanism provided in this embodiment, and FIGS. Fig. 8 is an explanatory diagram showing a conventional optical rotary encoder, Fig. 3 is an exploded perspective view showing the overall configuration, and Fig. 4 is a plan view showing a state in which the code board and the circuit board are arranged in correspondence. , FIG. 5 is an explanatory diagram showing the click mechanism, FIG. 6 is an exploded perspective view showing the roller and support member that constitute the click mechanism, FIG. 7 is a view showing the back side of the first code plate, and FIG. A diagram showing the back side of the second code plate, FIG. 9 is a developed view showing a desirable arrangement form of the first code plate and second code plate constituting a conventional optical rotary encoder, and FIG. 10 is a conventional The first part of the optical rotary encoder
FIG. 3 is a developed view showing an undesirable arrangement of the code plate and the second code plate. 2... First code plate, 3... Second code plate, 6... Reflective part, 7... Non-reflective part, 8... Concave part, 9... Convex part, 10... First window, 11...Second window, 12...Reflection window, 13...Reflection part, 14
...Non-reflective portion, 16...First light receiving/emitting element, 17
...Second light receiving/emitting element, 18...Third light receiving/emitting element, 19...Holder, 25...Circuit board, 32...
...roller, 33...shaft, 34...support member, 35
... Notch, 36 ... Holding part.

Claims (1)

[Scope of utility model registration request] Pulses are generated by a first code plate and a second code plate that are arranged coaxially and oppositely to each other so as to be relatively rotatable, and a light receiving and emitting element that is arranged opposite to the second code plate. A holder that forms a signal generating section, forms a click mechanism by the unevenness provided on the outer peripheral edge of the first code plate, and a roller that can engage with the unevenness, and holds the light receiving and emitting element. and a support portion that rotatably supports the roller so as to contact the unevenness, the optical rotary encoder comprising: a holding portion that holds the support portion on the holding body. type rotary encoder.