KR100316653B1 - Lens Position Adjuster of Optical System_ - Google Patents

Abstract

A lens position adjusting device of an optical system is disclosed.

The disclosed apparatus includes a housing in which a through hole is formed; A barrel disposed movably in the through hole and including a window coaxially formed with the through hole so that light emitted from the light source module can pass therethrough, and a lens installed on the window; And positioning means installed between the housing and the barrel to adjust the position of the lens by adjusting the relative position of the barrel relative to the housing.

Therefore, in adjusting the position of the lens located on the optical path, it is possible to adjust the position of the focusing, skew, tracking, etc. of the lens as well as the 360 degree inclination of the barrel relative to the housing.

Description

Lens position adjusting device of optical system

The present invention relates to an apparatus for adjusting a lens position of an optical system capable of adjusting a position of a lens positioned on an optical path generated and emitted from a light source module.

For example, an optical scanning device employed in an image output system for forming an image by an electrophotographic method such as a color laser printer, a digital copier, a scanner, a facsimile, or the like, by projecting an image generated by an image generating means onto a screen using a light source An optical system such as a projector device for forming an image, an optical pickup device such as a compact disk player (CDP), an optical disk player such as a laser disk player (LDP) and a digital disk player (DVDP), or the like, is an optical path generated and output from a light source module. Various lenses for concentrating the light or converting the optical path may be provided on the screen.

These lenses need to be precisely corrected for their phase difference by keeping them precisely at a predetermined position on the optical path.

The present invention was conceived in view of the above problems, and an object thereof is to provide an apparatus for adjusting a lens position of an optical system capable of adjusting the position of a lens positioned on an optical path.

1 is an exploded perspective view schematically showing a lens position adjusting device of the optical system according to an embodiment of the present invention.

2 is a cross-sectional view of FIG.

3 is a plan view of FIG.

<Description of the symbols for the main parts of the drawings>

10.Housing 12 ... Through penetration 13 ... Reference horizontal plane

15 Vertex horizontal 17 Medium horizontal 20

22 ... Windows 24 ... Lens 26 ... Without cap

28.Slit 30 ... Adjustment means 31.32.33 Set screw

34 Ball screw 40 Body 50 Spring

The present invention for achieving the above object, the through-hole housing is formed; A barrel positioned movably in the through hole and including a window coaxially formed with the through hole so that light emitted from the light source can pass therethrough, and a lens installed on the window; And positioning means installed between the housing and the barrel to adjust the position of the lens by adjusting the relative position of the barrel relative to the housing.

Here, the position adjusting means is:

A reference point set screw coupled to two reference point adjustment holes formed at a predetermined angle in a reference horizontal plane of the housing so as to contact the barrel; A vertex set screw coupled to a vertex adjusting hole formed at a point that is substantially bisected by the reference adjusting holes on the vertex horizontal plane spaced a predetermined height away from the reference horizontal plane so as to contact the barrel; And a ball screw fixed to an intermediate hole opposed to the vertex adjusting hole to be in contact with the barrel and formed on an intermediate horizontal plane roughly bisecting the reference horizontal plane and the vertex horizontal plane, wherein the reference point set screw and / or the vertex The position of the lens may be adjusted by rotating the set screws to adjust the position of the barrel in contact with the set screw with respect to the ball screw as a reference point.

According to another feature of the invention, it is provided in the through-hole so as to be interposed between the housing and the barrel, a spring for cushioning the movement of the barrel relative to the housing; is provided.

In addition, another feature of the present invention, the light source is installed, the main body coupled to the outside of one side of the housing to work integrally with the housing;

Furthermore, the cap member is provided at one end of the window, the cap member having a slit having a predetermined shape so that only a part of the light passing through the lens can be passed.

Hereinafter, with reference to the accompanying drawings will be described in detail a lens position adjusting apparatus of an optical system according to a preferred embodiment of the present invention.

1 is an exploded perspective view schematically showing an apparatus for adjusting a lens position of an optical system according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a plan view of FIG. 1.

As shown, the adjusting device according to the present invention includes a housing 10 having a through hole 12, a barrel 20 movably positioned in the through hole 12, a housing 10 and a barrel ( Position fixing means 30 provided between the 20, the main body 40, the light source module 42 is installed, and a spring 50 interposed between the housing 10 and the barrel (20).

The light source module 42 installed in the main body 40 includes a light source 41 such as a laser diode, a printed circuit board 43 for driving the light source 41, and a lead frame 44 wire-bonded with the laser diode. Include.

The housing 10 is integrally coupled to the body 40 by a plurality of bolts 11. In addition, the housing 10 has reference point adjustment holes 13a and 13b at an angle of about 120 degrees on the reference horizontal plane 13 in a direction perpendicular to the through hole 12 so that the positioning means 30 can be installed. Is formed through the vertex horizontal plane 15, which is spaced apart from the reference horizontal plane 13 by a distance between the reference adjustment holes 13a and 13b and roughly bisects the 120 degree angle, that is, the reference horizontal plane 13 When the vertex horizontal plane 15 is placed on the same plane, the vertex adjusting hole 15a penetrates perpendicularly to the through hole 12 at a point at which an angle of approximately 120 degrees is maintained with the reference point adjusting holes 13a and 13b. Is formed. On the other hand, the vertex adjustment hole 15a is opposed to about 180 degrees, and on the intermediate horizontal plane 17 which roughly bisects the reference horizontal plane 13 and the vertex horizontal plane 15, that is, the intermediate horizontal plane 17 and the vertex horizontal plane 15 ) Is placed on the same plane, the intermediate hole 17a is formed perpendicular to the through hole 12 at a point opposite to the apex adjustment hole 15a.

The barrel 20 is positioned to be movable in the through hole 12, and a window 22 through which the light generated by the light source module 42 can pass is formed coaxially with the through hole 12. . The lens 24 is installed on the window 22 to perform a function of focusing or refracting the light emitted from the light source module 42 in a desired direction. In addition, a cap member 26 is installed at the end of the window 22. The cap member 26 is formed with a slit 28 having a predetermined shape to pass a portion of the light emitted from the lens 24 through the slit 28 and block the remaining light.

The position adjusting means 30 may use a position adjusting mechanism such as a known electronic actuator, but in the present embodiment, as described above, the reference adjusting holes 13a and 13b formed in the housing 10 and the vertex adjusting hole. 15a, middle hole 17a, set screws 31, 32, 33 and ball screws 34 coupled to these holes 13a, 13b, 15a, 17a.

The set screws 31, 32, 33 are installed to contact the outer wall of the barrel 20 through the reference point and the vertex adjustment holes 13a, 13b, 15a from the outside of the housing 10, respectively, The reference point set screws 31 and 32 are known set screws that are coupled to the reference point adjustment holes 13a and 13b, and the vertex set screws 33 are respectively coupled to the vertex adjustment holes 15a. When the set screws 31, 32, and 33 have positional errors such as skewing, focusing, and tracking of the lens 24, the set screws 31, 32, and 33 rotate the set screws at appropriate points so that the barrel 20 relative to the housing 10 is rotated. By changing the position, the position of the lens 24 can be corrected.

On the other hand, the ball screw 34 is coupled to the middle hole 17a of the housing 10 so as to be in contact with the outer wall of the barrel 20, a known ball screw made of a body and a ball is used.

The spring 50 is installed on one side of the through hole 12 and functions to cushion the movement of the barrel 20 when determining the relative position of the barrel 20 with respect to the housing 10, and each set screw 31. When adjusting the position of the barrel 20 by rotating the 32 and 33, the movement of the barrel 20 is finely adjusted while supporting the barrel 20.

The operation of the position adjusting device of the optical system according to the present invention configured as described above will be described. Here, the directions of arrows A, B, C, D, E, and F in FIG. 3 indicate directions in which the upper end of the barrel 20 is inclined, respectively.

First, in order to adjust the position of the lens 24 when the upper end of the barrel 20 is inclined in the " A " direction, the reference point set screw 31 is slightly reversed and the reference point set screw 32 is slightly advanced. Let's do it. In this case, the vertex set screw 33 is not operated. Then, the barrel 20 is inclined at a predetermined angle in the " C " direction of the figure with respect to the ball screw 34 so that its position is corrected. In this case, if necessary, the vertex set screw 33 is reversed so that the barrel 20 is slightly inclined slightly in the "E" direction to adjust the final position of the barrel 20.

Second, in order to adjust the position of the lens 24 when the upper end of the barrel 20 is inclined in the "B" direction, all three set screws 31, 32, and 33 are retracted so that the barrel 20 and the set screw are reversed. Loosen the contact force between (31, 32, 33). Then, the barrel 20 is inclined in the "E" direction by the elastic force of the spring 50 about the ball screw 34 with respect to the housing 10, the position is adjusted. At this time, for precise control, the barrel 20 can be adjusted to a desired position by advancing the set screws 31, 32, 33 which have been retracted as described above slightly.

Third, in order to adjust the position of the lens 24 when the upper end of the barrel 20 is inclined in the "C" direction, the reference point set screw 32 is slightly reversed and the reference point set screw is reversed as opposed to the first case. Advance (31) slightly. In this case, the vertex set screw 33 is not operated. Then, the barrel 20 is inclined at a predetermined angle in the " A " direction of the figure with respect to the ball screw 34 so that its position is corrected. In this case, if necessary, the vertex set screw 33 is reversed so that the barrel 20 is slightly inclined slightly in the "E" direction to adjust the final position of the barrel 20.

Fourth, in order to adjust the position of the lens 24 when the upper end of the barrel 20 is inclined in the "D" direction, the reference point set screw 31 is slightly advanced and the reference point set screw 32 is slightly reversed. Then, the position of the barrel 20 is inclined by the predetermined angle in the direction "A" of the figure, thereby correcting its position. In this case, secondary position correction is possible by advancing the vertex set screw 33 to incline the upper end portion of the barrel 20 in the " B "

Fifth, in order to adjust the position of the lens 24 when the upper end portion of the barrel 20 is inclined in the "E" direction, the barrel 20 is moved in the "B" direction of the figure by advancing the vertex set screw 33 slightly. The position can be corrected by tilting it. In this case, the above object can be achieved by advancing the set screws 31 and 32 as necessary.

Sixth, in order to adjust the position of the lens 24 when the upper end of the barrel 20 is inclined in the " F " direction, the barrel is moved by moving the reference point set screw 31 and advancing the reference point set screw 32 at the same time. The position can be adjusted by inclining the upper end of 20 in the direction "C" of the figure.

Lens position adjusting device of the optical system according to the present invention having the configuration as described above, the lens positioned on the optical path by arranging three set screw and ball screw vertically penetrating the through hole of the housing in which the barrel is installed at a predetermined angle In adjusting the position of the lens, it is possible to adjust the position of the focusing, skew, tracking, etc. of the lens as well as the 360 degree inclination of the barrel relative to the housing.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Therefore, the true technical scope of the present invention should be defined by the following claims.

Claims (5)

A through-hole housing; A barrel positioned movably in the through hole and including a window coaxially formed with the through hole so that light emitted from the light source module can pass therethrough, and a lens installed on the window; And And a position adjusting means provided between the housing and the barrel to adjust the position of the lens by adjusting a relative position of the barrel with respect to the housing. The method of claim 1, wherein the position adjusting means: A reference point set screw coupled to two reference point adjustment holes formed at a predetermined angle in a reference horizontal plane of the housing so as to contact the barrel; A vertex set screw coupled to a vertex adjusting hole formed at a point that is substantially bisected by the reference adjusting holes on the vertex horizontal plane spaced a predetermined height away from the reference horizontal plane so as to contact the barrel; And And a ball screw fixed to an intermediate hole formed on an intermediate horizontal surface facing the vertex adjusting hole to be in contact with the barrel and roughly bisecting the reference horizontal plane and the vertex horizontal plane. The position of the lens can be adjusted by rotating the reference point set screw and / or the vertex set screw, respectively, by adjusting the position of the barrel contacting the set screws with the ball screw as a reference point. Lens position adjuster. The method of claim 1, And a spring installed in the through hole so as to be interposed between the housing and the barrel, the spring buffering the movement of the barrel relative to the housing. The method of claim 1, The light source module is installed, coupled to one outside of the housing main body that acts integrally with the housing; lens position adjustment device of the optical system, characterized in that further comprising. The method of claim 1, And a cap member installed at one end of the window, the cap member having a slit having a predetermined shape so that only a part of the light passing through the lens can pass therethrough.