KR101567810B1 - Barrel of optical system - Google Patents

Abstract

Discloses an optical system barrel of optical system. A first lens assembly having a first lens group and provided with a plurality of first fins in the circumferential direction of the outer circumferential surface; a second lens assembly coupled with the first lens assembly, A second lens assembly having a second lens group, a second lens assembly coupled to the guide barrel, a plurality of second pins formed on the first barrel, and a moving plate for adjusting the tilt; A cam barrel connected to the second lens assembly, the cam barrel having a first cam and a second cam formed along an inner circumferential surface thereof, a gear disposed in a circumferential direction of a lower end of the outer circumferential surface thereof, and a third pin formed therein; An outer guide barrel connected to the cam barrel and formed with a third cam for rotation and linear movement of the cam barrel and having a second straight guide part for preventing the rotation of the guide barrel, And a third lens assembly which is supported by the base and is guided by a guide boss installed on the base by a driving motor, the lens assembly being mounted on the base, It is possible to adjust the deviation of the component supporting each lens group assembly.

Barrel, cam barrel, lens assembly, outer guide barrel, guide barrel

Description

Barrel of optical system < RTI ID = 0.0 >

The present invention relates to an optical system lens barrel, and more particularly, to an optical system lens barrel in which optical axes of lens groups are aligned to improve resolution.

In general, a digital camera adopts various methods in order to realize miniaturization and thinning. In the digital camera, the lens-type camera is mounted in the camera housing part, and focuses on the distance according to the amount of the lens barrel part By selectively controlling the change, a clear image can be realized.

Korean Patent Laid-Open Publication No. 1994-12027 discloses a two-zone changeable automatic focusing device of a heart-shaped camera so as to adjust a mechanically limited focus without using a photo interrupter and a CPU for automatic focus adjustment.

Korean Patent Laid-Open Publication No. 1994-12026 discloses that when a lens barrel is extracted according to a distance of a light receiving unit circuit, a focal point, a standard distance, and a focus at a long distance are selectively controlled by a mechanical operation, A focus adjusting device for a heart-shaped camera is disclosed.

Korean Patent Laid-Open Publication No. 1994-19483 discloses a lens barrel in which an optical axis of the lens barrel is widened so as to minimize eccentricity of the focus, thereby minimizing an error in focus and also enabling the focus to be mechanically adjusted without using a light- An automatic focusing device for an image pickup camera is disclosed.

However, in recent years, due to the tolerance of the unit of the lens assembly for reducing the number of pixels and miniaturization of the camera, deterioration of resolving power is caused, and deterioration of resolving power is directly linked to deterioration of productivity, resulting in increase of cost of the product do.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an image pickup apparatus capable of correcting the resolution difference at four peripheral portions of an image of a final stage by a phenomenon in which a lens assembly having different optical axes is turned at a predetermined angle on a path of light incident from a subject It is a principal object of the present invention to provide an optical system barrel improved in structure so as to have a minimum deviation.

According to an aspect of the present invention, there is provided an optical system lens barrel,

A first lens assembly having a first lens group and provided with a plurality of first fins in a circumferential direction of an outer peripheral surface;

A guide barrel coupled to the first lens assembly and having a rotation stopper in a circumferential direction of a lower end of an outer circumferential surface thereof and having a first straight guide part in a height direction;

A second lens assembly having a second lens group, a second lens assembly coupled to the guide barrel, wherein a plurality of second pins are formed, and a moving plate for adjusting the tilt is provided;

A cam barrel connected to the first lens assembly and the second lens assembly, the cam barrel having a first cam and a second cam formed along an inner circumferential surface thereof, a gear disposed in a circumferential direction of a lower end of the outer circumferential surface thereof,

An outer guide barrel connected to the cam barrel to form a third cam for rotation and rectilinear motion of the cam barrel and having a second rectilinear guide for preventing rotation of the guide barrel;

A driving unit for transmitting a rotational force to the cam barrel;

A base to which the driving unit is fixed; And

And a third lens assembly supported on the base and guided by a guide boss installed on the base by a drive motor.

The moving plate may include a tilt adjusting spring installed between the second lens assembly and the base and disposed between the second lens assembly and the moving plate and a tilt adjusting screw inserted into the tilt adjusting spring through the moving plate Respectively.

In addition, the second pin is mounted on a moving plate,

And the second pin is connected to the second cam of the cam barrel.

In addition, the first pin of the first lens assembly is connected along a first cam formed along an outer circumferential surface of the cam barrel so that the first lens assembly can move up and down.

Further, the guide barrel is connected to a second rectilinear guide provided in the height direction of the outer guide barrel so that the rotation barrel can be linearly moved.

Furthermore, the third pin of the cam barrel is connected to the third cam of the outer guide barrel so as to enable rotation and rectilinear motion.

As described above, the optical system lens barrel according to the present invention can minimize the deviation of the vertical, horizontal, and vertical positions of the peripheral portion by adjusting the tilt deviation of the lens assembly that can be operated, not the fixed portion. In addition, it is possible to manufacture a high-performance barrel by adjusting the deviation of the component supporting each lens assembly by adjusting the operable lens assembly.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

1 shows an optical system lens barrel 100 according to an embodiment of the present invention.

Referring to FIG. 1, the optical system lens barrel 100 includes a first lens assembly 110, a guide barrel 120, a second lens assembly 130, a cam barrel 140, A third lens assembly 150, an outer guide barrel 160, a driving unit 170, and a base 180.

The first lens assembly 110 supports the first lens group 111 and is provided with three first pins 112 in the circumferential direction of the lower outer circumferential surface so as to be vertically movable. The first lens assembly 110 is movable up and down along a first cam 141 formed along an outer circumferential surface of the cam barrel 140.

The guide barrel 120 is provided with three rotation restricting tails 121 in the circumferential direction at the lower end of the outer circumferential surface and three first linear guide portions 122 are formed in the height direction of the guide barrel 120. The guide barrel 120 is coupled to the second lens assembly 130.

The guide barrel 120 is coupled to the second linear guide 161 provided in the height direction of the outer guide barrel 160 so that the guide barrel 120 can only move straight Do. The first lens assembly 110 can be linearly moved due to the rectilinear motion of the guide barrel 120. The guide barrel 120 is inserted into the cam barrel 140 and can move up and down like the cam barrel 140.

The second lens assembly 130 supports the second lens group 131, has three second pins 132 that can be advanced, and includes a shutter and a diaphragm. The second lens assembly 130 is guided by the guide barrel 120 and is vertically moved by the second cam 144 of the cam barrel 140.

The cam barrel 140 is rotated and linearly moved to move the first lens group 111 of the first lens assembly 110 and the second lens group 131 of the second lens assembly 130 to the straight movement The first cam 141 and the second cam 144, which are provided to the required position, are formed. The cam barrel 140 is provided with a gear 142 receiving a rotational power in the circumferential direction of the lower end of the outer circumferential surface. The cam barrel 140 is provided at its lower end with three third pins 143 for rotation and straightening.

The lower end of the outer guide barrel 160 is fixed to the base 180 and a third cam 162 is formed along the outer circumference to enable the cam barrel 140 to rotate and rectilinearly move. The outer guide barrel 160 is formed with three second linear guides 161 in the height direction of the outer guide barrel 160 to prevent the guide barrel 120 from rotating.

The drive unit 170 includes a first drive motor 171 and a plurality of reduction gears (not shown) connected to the first drive motor 171. The output gear 172 is connected to the gear 142 of the cam barrel 140, And transmits a rotational force to the cam barrel 140. The driving unit 170 is fixed to the base 180 in a screwed manner.

The base 180 supports the optical system lens barrel 100 and supports the third lens assembly 150 and the second drive motor 190 by a guide boss 181.

The third lens assembly 150 supports a third lens group (not shown) and is guided by the guide boss 181 by the second drive motor 190 so that the third lens assembly 150 is punched Is installed.

The optical system lens barrel 100 is rotated by the rotation of the cam barrel 140 and the first lens assembly 110 and the second lens assembly 120 by the first cam 141 and the second cam 144 130 move up and down in the straight direction.

Herein, the first lens assembly 110 and the second lens assembly 130 are moved in the forward and backward directions by the grooves of the first cam 141 and the second cam 144 of the cam barrel 140, The first lens assembly 110 and the second lens assembly 130 are separated from each other by the operating margin of the first pin 112 of the assembly 110 and the second pin 132 of the second lens assembly 130 And the second lens assembly 130 is provided with a means for adjusting the tilt to control the tilt amount of the lens group due to such deflection.

That is, referring to FIG. 2, the second lens assembly 130 is provided with a shutter 132a, and is linearly moved by one assembly 130. A moving plate 210 for the second lens assembly is installed between the second lens assembly 130 and the base 180 on the rear side of the second lens assembly 130 in order to adjust the tilt .

The moving plate 210 is formed with the three second pins 132 and the second pin 132 is coupled to the second cam 144 of the cam barrel 140. After assembling the second lens assembly 130 and the moving plate 210 by the second pin 132 the moving plate 210 is moved by the second cam 144 of the cam barrel 140 I'm doing a straight forward movement. The second lens assembly 130 is supported by the moving plate 210 to allow the same linear motion as the moving plate 210.

Three tilt adjusting springs 220 are provided between the second lens assembly 130 and the moving plate 210 to adjust the tilt amount of the second lens assembly 130, And a tilt adjusting screw 230 is coupled through a screw 210. Accordingly, the amount of tilt of the second lens assembly 130 having the moving plate 210 can be adjusted by tightening and loosening the tilt adjusting screw 230 in the tilting direction.

The operation of the optical system barrel 100 having the above-described structure will be described with reference to FIGS. 1 and 2. FIG.

When the power is applied to the first driving motor 171 of the driving unit 170 to rotate the output gear 172, the gear 142 of the cam barrel 140 connected thereto rotates the cam barrel 140 ).

The cam barrel 140 is moved at the same time as the guide barrel 120 but the three rotation restricting tails 121 of the guide barrel 120 are coupled by the three second rectilinear guides 161 and are not rotated, (140). The cam barrel 140 rotates and is vertically driven by the three third pins 143 of the cam barrel 140 connected to the third cam 162 of the outer guide barrel 160.

The first lens assembly 110 includes three first pins 112 coupled to three first linear guide portions 122 and a first cam 141 formed along an outer circumferential surface of the cam barrel 140 Up and down motion.

The second lens assembly 130 is coupled to the first rectilinear guide part 122 of the guide barrel 10 like the first lens assembly 110 and is coupled to the second cam 144 of the cam barrel 140 When the cam barrel 140 rotates, the second cam 144 moves up and down.

The third lens assembly 150 is coupled to the guide boss 181 of the base 180 so that the second driving motor 190 rotates and vertically moves by screwing to align the pants.

At this time, when the second lens assembly moving plate 210 installed at the rear of the second lens assembly 130 is allowed to move linearly by the second cam 144 of the cam barrel 140, the three tilt adjusting screws The tilt of the second lens assembly 130 having the moving plate 210 can be adjusted by multipoint adjustment by tightening or loosening the lens 230.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1 is an exploded perspective view showing an optical system lens barrel according to an embodiment of the present invention,

Figure 2 is an exploded perspective view of the second lens assembly portion of Figure 1 in an enlarged scale.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

100 ... optical system lens barrel 110 ... first lens assembly

120 ... guide barrel 122 ... first straight guide

130 ... second lens assembly 131 ... second pin

140 ... cam barrel 141 ... first cam

150 ... third lens assembly 160 ... outer guide barrel

170 ... drive unit 180 ... base

210 ... movement plate 220 ... tilt adjustment spring

230 ... tilt adjusting screw

Claims (6)

A first lens assembly having a first lens group and provided with a plurality of first fins in a circumferential direction of an outer peripheral surface; A guide barrel coupled to the first lens assembly and having a rotation stopper in a circumferential direction of a lower end of an outer circumferential surface thereof and having a first straight guide part in a height direction; A second lens assembly having a second lens group, a second lens assembly coupled to the guide barrel, wherein a plurality of second pins are formed, and a moving plate for adjusting the tilt is provided; A cam barrel connected to the first lens assembly and the second lens assembly, the cam barrel having a first cam and a second cam formed along an inner circumferential surface thereof, a gear disposed in a circumferential direction of a lower end of the outer circumferential surface thereof, An outer guide barrel connected to the cam barrel to form a third cam for rotation and rectilinear motion of the cam barrel and having a second rectilinear guide for preventing rotation of the guide barrel; A driving unit for transmitting a rotational force to the cam barrel; A base to which the driving unit is fixed; And And a third lens assembly supported on the base and guided by a guide boss installed on the base by a drive motor. The method according to claim 1, The moving plate is installed between the second lens assembly and the base, A tilt adjusting spring provided between the second lens assembly and the moving plate, and a tilt adjusting screw inserted into the tilt adjusting spring through the moving plate. 3. The method of claim 2, The second pin is installed on the moving plate, And the second pin is connected to the second cam of the cam barrel. The method according to claim 1, Wherein the first pin of the first lens assembly is connected along a first cam formed along an outer circumferential surface of the cam barrel so that the first lens assembly can move up and down. The method according to claim 1, Wherein the guide barrel is connected to a second rectilinear guide provided in a height direction of the outer guide barrel so that the rotation barrel can be linearly moved. The method according to claim 1, And the third pin of the cam barrel is connected to the third cam of the outer guide barrel so as to be able to rotate and linearly move.

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