JPS6235147Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotation adjustment mechanism for optical components in an optical information reading device.

Conventional rotation adjustment mechanisms for optical components of this type have structures as shown in FIGS. 1 to 4. In the drawing, A is a holder, and the holder A is composed of a cylindrical part A ₁ and flange parts A ₂ and A ₃ provided on both sides of the cylindrical part A. An optical component B is placed in the center of the holder A. It is installed. Further, an arm C extends from a part of the outer periphery of one flange portion _A3 , and a female thread E into which an adjustment screw D is screwed is cut into the end of the arm C. F is a base, and the base F has a recess G for mounting the holder A between the front and rear columns _F1 and _F2 .
is formed. The width between the outer surfaces F _′ and F _′ in the left-right direction of the above struts F 1 and F 2 is the width between both flanges.
The width is set to be the same as the width between the inner surfaces of A ₂ and A ₃ . In addition, the recess G has inner surfaces G ₁ ′, G ₁ ′ in the front-rear direction that contact the cylindrical portion A ₁ of the holder A, and a V-shaped bottom surface.
G ₂ ′ is formed. Furthermore, female threads I into which screws H are screwed are carved on the upper surfaces of the supports F ₁ and F ₂ . J is a band-shaped fastener, and the fastener J has screw holes J ₁ and J 2 into which screws H are inserted at positions corresponding to the female screws I of the above-mentioned supports F 1 and F ₂ , and screw holes J ₁ and J ₂ in the center thereof. A female thread L is formed into which the fixing screw K is screwed. Further, a screw hole M into which an adjustment screw D is inserted is formed at the end of the stopper J, and N is a compression type spring.

Next, to explain the assembly, first, fit the holder A into the recess G of the base F, and then
The inner surfaces of A ₂ and A ₃ and the outer surfaces F′ of supports F ₁ and F ₂ ,
F' are rubbed together to restrain the movement of the holder A in the left-right direction (optical axis direction), and the cylindrical part _A1 of the holder A is in line contact with the inner surface _G1 ' and the bottom surface _G2 ' of the recessed part G. The holder A is mounted so as to be freely rotatable only about the optical axis, while restricting movement in the vertical and longitudinal directions.

Next, the stopper J is placed on the upper surface of both columns F ₁ and F ₂ , and the screw H inserted into the screw hole J ₁ is screwed into the female thread I of the columns F ₁ and F ₂ and tightened.
At the same time, screw the fixing screw K into the female thread L of the stopper J, and insert the tip of the fixing screw K into the cylindrical part of the holder A.
Abuts against ₁ . Further, an adjustment screw D inserted into a screw hole M formed at the end of the stopper J is screwed into a female thread E of the arm C through a spring N arranged between the stopper J and the arm C.

Therefore, by loosening or tightening the adjusting screw D, the holder A rotates around the optical axis, and the optical component B can be rotated and adjusted. After completing the adjustment, tighten the fixing screw K and hold the holder A.
is fixed so that it cannot rotate.

However, in the structure of the above conventional example, by sliding the inner surfaces of both flanges A ₂ and A ₃ of the holder A onto the outer surfaces F' and F' of the supports F ₁ and F ₂ , the holder A
The inner surfaces of the flanges A ₂ and A ₃ and the outer surfaces F' of the struts F ₁ and F ₂ are restrained from moving in the left and right direction.
If F′ is not precisely machined, looseness will occur. In addition, since holder A is fixed by crimping the cylindrical part A ₁ , which is very close to optical component B, with fixing screw K, holder A must be firmly fixed in order to prevent distortion or other effects on optical component B. It needs to become something. Furthermore, when the adjustment screw D is rotated as shown in FIG. 4, the head of the screw swings forward or backward, and an unreasonable force is applied to the adjustment screw D.
Since there will be a gap between the screw head and the stopper J,
The adjustment state becomes unstable. Further, there were drawbacks such as the large number of parts and the fact that it required a lot of time to assemble.

Therefore, this invention solves the above drawbacks,
An optical component rotation adjustment mechanism in an optical information reading device including a holder on which an optical component is mounted and a base, wherein the position of the rotation center of the optical component is at least at the circumference of the optical component as the center. The first curved surface of the holder forming a part of the holder, the first curved surface provided on the base, and the second curved surface that slide against each other make it immovable, and the optical component is configured to be immovable in the optical axis direction. Positioning is performed by a plate-like part formed on the holder and a groove-like part provided on the base to slidably hold the plate-like part, and rotational adjustment of the optical component is performed by a plate-like part formed on the holder. The formed first arm and the second arm provided on the base are connected by an adjustment screw and a nut via a spring, and the screwing amount of the screw and the nut is changed by changing the threading amount, Either the first arm has an arcuate surface and the nut is in contact with the arcuate surface, or the second arm has an arcuate surface and the second arm's arcuate surface and the head of the adjustment screw are in contact with each other. By contacting the parts, the number of parts is reduced,
An optical component rotation adjustment mechanism in an optical information reading device that allows the holder to be fixed after adjustment without causing distortion to the optical component, and to prevent rattling of the adjustment screw. is to provide.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. FIG. 5 is a perspective view showing the constituent members of the optical component rotation adjustment mechanism according to the present invention, and FIG. 6 is a front view of the same when assembled. FIG. 7 is a cross-sectional view taken along the line -- in FIG. 6, and FIG. 8 is a front view in an adjusted state.

In the above drawings, reference numeral 1 denotes a disk-shaped holder, and an optical component 2 made of, for example, a directional diffraction grating is mounted in a central circular hole. Furthermore, a guide cylinder 3 whose center coincides with the optical axis (left and right direction) of the optical component 2 is provided protruding from the surface of the holder 1 opposite to the surface on which the optical component 2 is attached, so that the first curved surface is formed. It is formed. Further, arcuate surfaces 4 are formed on the outer circumference of the holder 1 from corresponding positions on the diameter line.
Guide pieces 4a, 4 with the same radius of curvature a', 4b'
A plate-shaped portion is formed by protruding b. Further, a first arm 5 is provided to protrude from the outer periphery of the holder 1 in the radial direction. A recess 7 into which a nut 6 fits is formed on the upper surface side of the end of the first arm 5, and the bottom surface of the recess 7 has a circular arc surface 8 curved in the longitudinal direction of the first arm 5. is formed. Further, a long hole 9 whose major axis is in the longitudinal direction of the first arm 5 is formed in the center of the arcuate surface 8 . Furthermore, a recess equal to the outer diameter of the compression type coil spring 10 is formed on the lower surface opposite to the recess 7.

11 is a base, and on one side of the base 11 is a guide cylinder 12 that rotatably fits into the guide cylinder 3 described above.
A second curved surface is formed by protruding. Further, around the guide cylinder 12, arcuate grooves 13a and 13b are provided at corresponding positions on the diameter line, into which the guide pieces 4a and 4b are slidably fitted, respectively.
However, the radius of curvature of the circular arc surfaces 13a', 13b' of both the groove-like portions 13a, 13b is the same as that of the guide pieces 4a, 4.
The radius of curvature of the arcuate surfaces 4a' and 4b' of b is set slightly larger than that of the arcuate surfaces 4a' and 4b'. Reference numeral 14 designates a second arm protruding from the base 11. A screw hole 16 into which an adjustment screw 15 is inserted is formed at the end of the arm 14, and a coiled spring 10 is mounted on the upper surface of the end. A recessed portion equal to the diameter is formed.

Next, to explain how to assemble the above components, first, the guide cylinder 3 of the holder 1 and the base 1 are assembled.
1 guide cylinder 12, and both guide pieces 4a and 4b are made to correspond between both grooved portions 13a and 13b, respectively, as shown by the dashed line in FIG.
After fitting both the guide cylinders 3 and 12, the holder 1 is rotated so that the guide pieces 4a and 4b are fitted into the grooved portions 13, respectively.
a, 13b. As a result, the holder 1 is rotatable around the optical axis, but is attached to the optical axis (in the left-right direction) so as not to be movable. Next, the upper and lower ends of the coiled spring 10 are fitted into recesses formed in the lower surface of the first arm 5 and the upper surface of the second arm 14, respectively, so that the spring 10 is interposed between both arms 5 and 14. Then, the adjustment screw 15 inserted into the screw hole 16 of the second arm 14 is passed through the spring 10 and inserted into the elongated hole 9 of the first arm 5, and the nut 6 fitted in the recess 7 and the circular arc surface 8 are screwed together. match. Assembly is now complete.

Next, the effect will be explained. The holder 1 is biased counterclockwise in the figure by a spring 10 interposed between both arms 5 and 14, and the adjustment screw 15
When the optical component 2 is rotated in the loosening or tightening direction, the holder 1 with the optical component 2 mounted thereon rotates around the optical axis and adjustment is performed. At this time, the tip of the adjustment screw 15 into which the nut 6 is screwed moves within the elongated hole 9 even when the first arm 5 moves up and down, and the nut 6 slides on the arcuate surface 8, so the adjustment screw 15 No unnecessary force is applied to the screw head and the second arm 14.
There will be no looseness between the After the above-described adjustment is completed, the nut 6 and the adjustment screw 15 may be fixed, for example, the recess 7 is filled with an adhesive to fix the nut 6 and the adjustment screw 15. In the above embodiment, the arcuate surface 8 is formed on the first arm 5 so that the first arm 5 and the nut 6 are in line contact, but the head of the screw 15 and the second arm 14 Of course, the contact portion may be configured to form a line contact.

FIG. 9 is a front view of the main parts showing another embodiment of the present invention. In the above embodiment, the holder 1 has both guide cylinders 3
and 12 are the first curved surface and the second curved surface, respectively,
Although these fittings allow rotation around the optical axis, in this embodiment, there is no such guide cylinder, and the arcuate surfaces 4a' and 4b' of the guide pieces 4a and 4b are As the first curved surface, the arcuate groove 13
The arcuate surfaces 13a', 13b' of a, 13b are formed as second curved surfaces, and both the arcuate surfaces 4a', 4b' and 13a', 1
This is done by setting the radius of curvature to be the same as that of 3b'. The other points are the same as the previous embodiment.

As described above, the present invention is an optical component rotation adjustment mechanism in an optical information reading device that includes a holder 1 on which an optical component 2 is mounted and a base 11, and the mechanism includes a rotation center of the optical component 2. The positions are the first curved surfaces 3, 4a', 4b' of the holder 1 forming at least a part of the circumference around the optical component 2, and the first curved surfaces 3, 4a' provided on the base 11. , 4b' and second curved surfaces 12, 13a', 13b' that slide against each other, and the optical component 2 is positioned in the optical axis direction by a plate-shaped plate formed on the holder 1. groove-like portions 13 provided on the portions 4a, 4b and the base 11 and slidably holding the plate-like portions 4a, 4b;
a, 13b, and the rotational adjustment of the optical component 2 is performed by adjusting the rotation between the first arm portion 5 formed on the holder 1 and the second arm portion 14 provided on the base 11. Adjustment screw 15 via spring 10
and a nut 6, and the first arm 5
An arcuate surface 8 is formed on the second arm 14 and the nut 6 is brought into contact with the arcuate surface 8. Alternatively, an arcuate surface 8 is formed on the second arm 14 and the arcuate surface of the second arm is brought into contact with the adjustment screw 1.
This is an optical component rotation adjustment mechanism in an optical information reading device that is in contact with the head of No. 5.

Therefore, the number of parts is small, and during adjustment, the adjusting screw 15 moves through the long hole 9 and the nut 6 slides on the arcuate surface 8, so no unnecessary force is applied to the adjusting screw 15, and no play is caused to the screw head. No sticking occurs, ensuring stability and reliability of adjustment. Moreover, since the adjustment screw 15 and nut 6 are simply fixed when the adjustment is completed, unnecessary force is not applied to the optical components and no distortion or the like occurs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the components of a conventional optical component adjustment mechanism, FIG. Fig. 5 is a perspective view showing the components of the optical component rotation adjustment mechanism according to the present invention, Fig. 6 is a front view of the assembly, Fig. 7 is a cross-sectional view taken along the line - - of Fig. 6, and Fig. FIG. 9 is a front view showing the main parts of another embodiment. 1... Holder, 2... Optical component, 3, 4a', 4
b'...First curved surface, 4a, 4b...Plate-shaped portion (guide piece), 5...First arm, 6...Nut, 8
...Arc surface, 9...Long hole, 10...Spring, 11...
...Base, 12, 13a', 13b'...Second curved surface,
13a, 13b...Groove portion, 14...Second arm, 15...Adjustment screw.

Claims (1)

[Scope of utility model registration request] An optical component rotation adjustment mechanism in an optical information reading device including a holder and a base on which an optical component is attached, wherein the position of the rotation center of the optical component is set at a circumference around the optical component. A first curved surface of the holder forming at least a part of the holder and a second curved surface provided on the base and sliding against each other make it immovable; Positioning is performed by a plate-like part formed on the holder and a groove-like part provided on the base to slidably hold the plate-like part, and rotational adjustment of the optical component is performed by a plate-like part formed on the holder. The formed first arm and the second arm provided on the base are connected via a spring with an adjustment screw and a nut, and this is done by changing the screwing amount of this screw and nut. , forming an arcuate surface on the first arm and bringing the arcuate surface into contact with the nut, or forming an arcuate surface on the second arm, and making contact between the arcuate surface of the second arm and the head of the adjustment screw. 1. An optical component rotation adjustment mechanism in an optical information reading device, characterized in that: