JPS601455A - Rotation converter - Google Patents

Abstract

PURPOSE:To enable a precise conversion and transmission of a minute angular change, by coaxially disposing three cylinders having, respectively, a slit in parallel with the axis, a slit at an angle of theta1 with the axis, and a slit at an angle of theta2 with the axis, and passing an elongated bar, or a pin, through all of the slits. CONSTITUTION:A first and second cylinders 1, 2 having, respectively, a slit 20, 21 slanted at an angle of theta1, theta2 with the axis 30 and a third cylinder 3 having a slit 22 in parallel with the axis 30 are coaxially disposed, and a pin 10 is passed through the slits 20, 21, and 22 in common. Then, if the cylinder 1 is turned about the axis by an angle of alpha with reference to the cylinder 3, the cylinder 2 is thereby turned by an angle beta=alpha.tantheta1/tantheta2 with reference to the cylinder 3. Thus, a minute angular change can be precisely converted and transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary converter having the function of converting the rotation angle of a shaft at an arbitrary conversion ratio and coaxially.

Conventionally, the means for converting and transmitting the rotational speed of a single rotation of a shaft to an arbitrary rotational speed depending on the purpose and use is a combination of a large number of gears, such as the speed reducer of an automobile.

Two cylinders with different diameters are arranged coaxially, and a bearing etc. is inserted between the outer circumference of the inner cylinder and the inner circumference of the outer cylinder to adjust the conversion ratio between the rotation speed of the inner cylinder and the rotation speed of the outer cylinder. There was a mechanism to hold it. It can be said that these have necessary and sufficient functions and performance depending on their use and purpose.

However, while conventional products can theoretically demonstrate their functionality and performance even if the rotation angle is infinite.

If the rotation angle is a small change in angle of several degrees, it is not sufficient in terms of errors and two-hour responsiveness. For example, in an optical device, the angular relationship between one reflecting mirror, a ray of light incident on it, and a ray of reflected light is: If the angular change of one reflecting mirror is Δ01, then the angle between the incident light and the reflected light is 2Δθl. An angle converter used for such purposes is required to be small, have good followability, and have little error.

In view of these demands, it is an object of the present invention to provide a rotary converter that is simple in structure and small in size and can convert and transmit minute angular fluctuations with high accuracy, which cannot be handled by conventional techniques.

Next, three embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are diagrams showing the basic configuration of the present invention. In FIG. 1, cylinders 1, 2, and 3 are cylindrical parts that fit concentrically. 20 is an elongated hole provided in a diametrically opposing portion of the cylinder 1, and 21 is an elongated hole provided in a diametrically opposing portion of the ll:lf tray 2.

1+ −u +1llll 30, respectively angle θ1,
It has a slope of θ2. Reference numeral 22 denotes an elongated hole provided in the diametrical portion of the cylinder 3, and is arranged parallel to the central axis 30. 10
is a pin that passes through the elongated holes 20, 21, and 22 in common.

For the sake of simplicity, the inner diameter of the two cylinders 1 and the outer diameter of the cylinder 2 are assumed to be equal, and the radius is assumed to be r in the description. Distance H2r in one direction of cylinder
・The plow tries to move by α and θ1.

Since pin 10 moves by this distance in the 1q11 direction, VC(
It is necessary for the cylinder 2 to rotate with respect to the cylinder 3 through an angle of H/r-θ2. However, the pin log: actually does not move, and the force acting on the pin 10 is transmitted to the kneading cylinder 2 as rotational force. fi'lJ, 2 for 3 cylinders
When the cylinder 1 is rotated by an angle α, the cylinder 2 is rotated by an angle β=α·−θ1 /lanθ2 with respect to the cylinder 3.

The axial positional relationship between the cylinders 1 and 2 is determined by the relationship between the width of the elongated hole and the outer diameter of the pin, since the intersection point between the centers of the elongated holes 20 and 21 is regulated by the pin 10. d on the difference foot: No change.

However, the axial positions of the cylinders 1 and 2 are movable relative to the cylinder 3 within the length of the elongated hole 22. In order to prevent this movement, a structure as shown in FIG. 3, for example, is adopted, and the displacement in the axial direction of 2.3 can be suppressed. That is, in the structure shown in the third (S), the two cylinders 1 and 2 each have a flange 4o.

41, both of which are housed inside the flange 42 of the cylinder 3, and are wrapped by the presser plate 4 fixed to the flange 42.

The basic operation of the present invention has been explained above using FIGS. 1 to 3, and an example of its application will now be explained using FIG. 4.

In FIG. 4, the mechanism designated by the group I, 2.3 is a rotary transducer having the function according to the invention as shown in FIG. The mirror 50 is fixed to a mirror holder 51, and the cylinder 2i is mechanically fixed so that the center axis of rotation of the one-rotation converter is included in the reflection surface of the mirror 500. 5 and 6 are J+, center 11 (1131, 32'
(It has 5) e Eve./F If 05 is its center 1'
lQI] and the rotation axis of the rotation converter intersect with each other.
3 and is mechanically fixed. Further, the guide 6 is mechanically fixed to the VC cylinder 1 so that its center axis intersects with the rotation axis of the rotation converter. Furthermore, as a conversion ratio, α/β
-==2 The angle θ1 of the elongated hole in Fig. 1
, θ2 are selected in advance. With these settings, the incident light beam in FIG. Fix it after adjustment. With this setting, even if the angle θ3 between the 5 and 6 changes by just a few degrees, the mirror 50 will rotate in the direction of the change by 1/2 of the change. , a highly accurate conversion is performed. That is, even if the angle between the two pipes 5 and 6 changes, the relationship between the central axis of each pipe and the mirror can maintain the relationship that the angle of incidence and angle of reflection are equal. Such a rotary converter is most suitable for use in a waveguide for transmitting electromagnetic waves or a transmission line for laser light, where the bending angle of a transmission pipe changes.

As explained above, according to the present invention, it is possible to realize a small and highly accurate rotary converter having an f7i' + rabbit structure.

[Brief explanation of the drawing]

1 to 3 are factors for explaining the basic principle of the present invention, and Figure 3 is a diagram showing two embodiments of the present invention. In the figure, tlj2t3 is a cylinder, 4 is a lid, 5 and 6 are holes, 10 is a pin, 20, 21.22 are elongated holes made in the cylinder, 50 is a mirror, and 51 is a mirror holder. Figure 1 Jiao Figure 2

Claims (1)

[Claims] 1. A first cylinder provided with an elongated hole so as to have an angle θ1 inclined with respect to the central axis, and a first cylinder that is combined concentrically with the first cylinder and has an angle θ2 inclined with respect to the central axis. a second cylinder provided with an elongated hole;
a third cylinder concentrically combined with the cylinder of the first cylinder and having an elongated hole parallel to the central axis; Second. A rotation transducer comprising a rod-shaped body provided so as to pass through each of the third elongated holes.