KR101589495B1 - Lens barrel assembly and the digital photographing apparatus comprising the same - Google Patents

Abstract

The present invention provides a lens comprising: a lens group member including at least one lens disposed along an optical axis direction; A lens barrel for accommodating the lens group member; An inlet portion having a curved shape that is adjustable in an angle so as to adjust an optical axis of the lens group member while being in contact with a part of the inner wall of the inlet hole so as to be perpendicular to the optical axis direction, A guide member having a protruding portion protruding in a direction opposite to the inserting portion; And a cam barrel having a cam groove formed to slide on the protrusion of the guide member to move the lens group member along the optical axis direction, and a digital photographing apparatus including the lens barrel assembly.

Description

[0001] The present invention relates to a lens barrel assembly and a digital photographing apparatus having the lens barrel assembly and the digital photographing apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lens barrel assembly and a digital photographing apparatus having the lens barrel assembly. More particularly, the present invention relates to a lens barrel assembly, Assembly and a digital photographing apparatus including the same.

As miniaturization and thinning of a digital camera have accelerated, miniaturization of the lens barrel has become inevitable in the whole size and volume, and accordingly, the sensitivity of the lens in the optical system is gradually increasing. Particularly, this is particularly the case in a zoom lens barrel in which the distance between the zoom lens groups is changed and the magnification is performed.

FIG. 1 is an exploded perspective view showing a state in which a guide member is coupled to a zoom lens barrel according to the related art, and FIG. 2 is an assembled cross-sectional view of FIG.

Referring to the drawings, a lead-in portion 31 of a guide member 30 is received in a lead-in hole 25 formed in a side surface of a zoom lens barrel 20. The projecting portion 33 is provided in the opposite direction of the inlet portion 31. The projecting portion 33 is slid along a cam groove (not shown) formed in a cylindrical three-dimensional cam (not shown) .

Generally, the guide member 30 used in the zoom lens barrel 20 is manufactured not in a member molded integrally with the zoom lens barrel 20 but in a separately processed member in order to enhance the impact resistance, A press-fitting structure is adopted.

In this case, a positional deviation may occur in the insertion hole 25 of the zoom lens barrel 20 in the manufacturing of the mold, a manufacturing error may occur in the manufacturing process of the guide member 30, and the insertion hole 25 of the zoom lens barrel 20, An error such as a tilt or a decent may occur when the guide member 30 is press-fitted into the guide member 30. Here, the third error may cause remarkable degradation of the optical system.

When the guide member 30 is integrally molded with the zoom lens barrel 20, a shape guided by the cam groove (not shown) is formed in a structure in which the zoom lens barrel 20 and the guide member 30 are integrated It is possible to prevent the optical performance from deteriorating due to the manufacturing error of the mold. However, since it is a mold, the strength is weak and the position adjustment is restricted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens barrel assembly capable of adjusting the optical axis of the guide member when the guide member is slid along the cam groove when the zoom lens is mounted on the lens barrel, And an object of the present invention is to provide a digital photographing apparatus including the digital photographing apparatus.

The present invention provides a lens comprising: a lens group member including at least one lens disposed along an optical axis direction; A lens barrel for accommodating the lens group member; An inlet portion having a curved shape that is adjustable in an angle so as to adjust an optical axis of the lens group member while being in contact with a part of the inner wall of the inlet hole so as to be perpendicular to the optical axis direction, A guide member having a protruding portion protruding in a direction opposite to the inserting portion; And a cam barrel having a cam groove formed in such a manner that the protrusion of the guide member is fitted and slid to move the lens group member along the optical axis direction.

According to another aspect of the present invention, at least three or more insertion holes may be formed in the lens barrel so as to be symmetrical with respect to the optical axis.

According to another aspect of the present invention, the guide member can achieve axial symmetry.

According to another aspect of the present invention, the region sandwiched between the inlet holes of the inlet portion may be spherical.

According to another aspect of the present invention, a protruding support plate protruding perpendicularly to the shaft may be further provided between the protruding portion and the inserting portion of the guide member.

According to another aspect of the present invention, the inlet hole may include an inlet receiving hole for receiving the inlet portion and a support plate receiving hole for receiving the protruding support plate.

According to another aspect of the present invention, the diameter of the projecting support plate receiving hole may be larger than the diameter of the receiving portion receiving hole.

According to another aspect of the present invention, a bonding member may further be provided between the inlet portion and the protrusion support plate and between the inlet hole.

According to another aspect of the present invention, the guide member may include aluminum.

The present invention also provides a digital photographing apparatus including the above-described lens barrel assembly.

According to the present invention as described above, it is possible to provide a lens barrel assembly capable of easily correcting an optical axis error of a lens group member according to an inclination angle adjustment of a guide member with respect to a lead-in hole, The present invention can provide a digital image photographing apparatus.

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

FIG. 3 is an exploded perspective view schematically showing a lens barrel assembly according to an embodiment of the present invention, FIG. 4 is a cross-sectional view schematically showing a state in which a guide member is coupled to a lens barrel according to an embodiment of the present invention And Figure 5 is a schematic cross-sectional view of a lens barrel assembly in accordance with one embodiment of the present invention.

Referring to the drawings, the zoom lens barrel assembly 100 according to the present embodiment includes a lens group member 110, a lens barrel 120, a guide member 130, a cam barrel 140, and a bonding member 150 do.

Lens element 110 includes a first lens group 111 and the second lens group 112 is arranged along the optical axis (l _0). At least one of the first lens group 111 and the second lens group 112 may be a moving lens. The moving lens functions as a zoom lens, a focus lens, or the like.

Although the lens group member 100 according to the embodiment of the present invention includes two lens groups 111 and 112, the present invention is not limited thereto. That is, it is needless to say that various changes such as the number, shape, and position of the lens group members 110 according to the present invention are possible.

The lens group member 110 is accommodated in the lens barrel 120. The lens barrel 120 is provided with a lens supporting portion 121 surrounding the lens group member 110 and supporting the lens group member 110.

The lens support 121 is seated on the cylindrical body 122 of the lens barrel 120 so that the lens support 121 is symmetrical about its geometric center point.

At this time, the outer peripheral surface of the trunk portion 122 of the lens barrel 120, the optical axis (l ₀₎ on the guide member (130 inlet holes 125 of a predetermined number in a vertical direction are formed, each inlet hole (125) ). Each of the inlet holes 125 has an inlet receiving hole 125a and a supporting plate receiving hole 125b. The support plate receiving hole 125b is formed to be larger than the size of the receiving portion receiving hole 125a.

According to a preferred embodiment of the present invention, three entrance holes 125 are provided in the lens barrel, but the present invention is not limited thereto. That is, at least one or more of the inlet holes 125 are arranged so as to correspond to the number of the guide members 130 to be described later, and by adjusting the angle with respect to the inlet hole 125 of the guide member 130, There is no limitation on the number and the shape of the member 110 if the condition for correcting the optical axis error of the member 110 is satisfied.

The guide member 130 is composed of a lead-in portion 131, a protrusion support plate 132, and a protrusion 133.

The inlet portion 131 is received in the inlet receiving hole 125a of the inlet hole 125 formed in the body 122 of the lens barrel 120, The cam 133 is housed in the cam groove 141 of the cam barrel 140 and is provided with a protrusion support plate 132 formed between the inlet portion 131 and the protrusion 133 to partition the inlet portion 131 and the protrusion portion 133. [ Is received in the support plate receiving hole 125b, which is the entrance of the inlet hole 125. [

Since the guide member 130 is manufactured in a separate process from the manufacture of the lens barrel 120, the strength of the guide member 130 can be enhanced as compared with the mold member integrally formed with the lens barrel 120. In this embodiment, A guide member 130 is used. In addition, each of the elements 131, 132, 133 constituting the guide member 130 is preferably formed to be axisymmetric.

According to the present embodiment, the lead-in portion 131 has a spherical shape, and the receiving hole 125a has a cylindrical shape. The inlet portion 131 is arranged so as to be rotatable in contact with a part of the inner wall of the inlet receiving hole 125a. In other words, the designer is a press-fitted into the receiving hole the inlet 131 in the jig such as the following, the optical axis (l _0), the lens is rotated predetermined the central axis to the projection 133 by the angle tilt of the guide member 130 is perpendicular to the group The tilt and / or descent error of the member 110 with respect to the optical axis can be corrected. To this end, the outer diameter of the inlet portion 131 may be the same as the inner diameter of the inlet receiving hole 125a.

The bonding member 150 is inserted into the spaced space between the lead-in hole 125 and the lead-in portion 131, and the lead- By the curing process, the guide member 130 is fixed to the lens barrel 120.

On the inner wall of the cylindrical cam barrel 140, one or more cam grooves 141 for guiding the magnification of the zoom lens are formed.

The shapes of the cam grooves 141 shown in the drawings are shown as an example, and the present invention is not limited thereto. That is, if the distance between the first lens group 111 or the second lens group 112 is appropriately changed to perform a necessary zooming operation, the detailed shape of the cam groove 141 is not particularly limited. Therefore, the designer can determine the curvature and shape of the cam grooves 141 in accordance with the amount of change in distance between the first lens group 111 and the second lens group 112 necessary for zooming.

The protrusions 133 of the guide member 130 are accommodated in the cam grooves 141 and slide to move the lens group member 110 to perform magnification. Although not shown in the drawings, the lens barrel assembly 100 may further include a zoom motor (not shown) for providing a driving force.

6 and 7, an operation of adjusting the error of the optical axis of the lens group member according to the angle adjustment of the guide member with respect to the entrance hole will be described in the lens barrel assembly according to the embodiment of the present invention.

FIG. 6A is a cross-sectional view showing a case where the guide member is inserted into the inlet hole in parallel, and FIG. 7A is a schematic view showing the dynamics of the force formed in the three inlet holes. FIG. 6B is a cross-sectional view showing a case where one of the guide members is pulled in at a predetermined inclination angle with respect to the axis of the pull-in hole, and FIG. 7B is a schematic view of the force dynamics at the three pull-in holes.

Referring to FIGS. 6A and 7A, three guide members 130 drawn into three positions P1, P2, and P3 of three inlet holes 125 formed in the lens barrel 120 are provided with optical axes l ₀ (F ₁ = F ₂ = F ₃ ) having a constant size is applied in the direction of the center of the rotor. That is, a case where the parallel force on the vertical axis (g ₀₎ to the optical axis (l ₀₎ of the three guide members 130 is a guide member 130 is a three force (F ₁ a = F ₂ = F ₃₎ are both in the vertical component force is not generated (that _{is, F 1T = F 2T = F} 3T = 0), all of the F (the horizontal component force, as shown in Figure _{7a 1H = F 2H = F 3H} ) . Thus, the guide so achieving the three forces are all equilibrium is applied to the member 130 (that _{is, F 1 = F 2 = F} 3 = F 1H = F 2H = F 3H) central axis is the optical axis of the lens member 110 ( ₁₀ ) without tilt or decenter.

6B and 6B, when one of the guide members 130 is pulled in one of the insertion holes forming a predetermined inclination angle?, The lens barrel 120 is rotated, Even if a constant force F ₁ = F ₂ = F ₃ is applied to the three guide members 130 that are drawn into the three positions P1, P2, and P3 of the three draw-in holes 125 formed in the optical axis L1, the force of the horizontal component parallel to the axis g ₀ perpendicular to the vertical axis l ₀ is not all the same.

For example, if the guide member 130 forms the inclination angle? At the position P1 of the first inlet hole and is drawn into the inlet hole 125, the force F ' ₁ becomes equal to the force F ' _1H ) and the force of the vertical component (F' _1T ). And, since the second and the position of the third inlet holes (P2, P3) in the applied parallel to the force perpendicular to the axis (g ₀₎ to the optical axis (l _0), the guide member 130 has been, the guide member 130 The force of the vertical component is not generated in both of the two forces (F ₂ = F ₃ ) applied to the light source, but is converted to the force of the horizontal component (F _2H = F _3H ) as shown in FIG. 7B.

Therefore, the equilibrium state of the horizontal component of the three forces applied to the guide member 130 is broken (i.e., F _2H = F _3H ≠ F _1H ), so that the equilibrium is broken in the force of the horizontal component, with respect to the center axis is the optical axis (l ₀₎ of 110) is moved in the direction P1. In the case of the vertical component force, it is moved in the opposite direction (-z) direction of the optical axis (l _0). This can lead to descent (decent) and / or tilt (tilt) of the lens member 110 is moved with respect to the optical axis (l _0), the central axis of the lens member 110.

In the above description, when the central axis of the lens member 110 matches the optical axis (l _0), lens member by adjusting the inclination angle (θ) of the guide member 130 about the inlet hole (125)) ( the central axis 110) illustrates a case deviates from the optical axis (l _0). It interprets it as a station, if the central axis of the lens member 110, the optical axis away from the optical axis (l ₀₎ (l ₀₎ yeotdamyeon optical system for a tilting or descent occurs on the incoming hole (125) in accordance with the aforementioned method The tilt and / or descent of the optical system can be adjusted by adjusting the inclination angle [theta] of the guide member 130 with respect to the optical axis.

If the tilt and / or descent of the lens group member 110 is corrected by the above operation, the bonding member 150 is inserted and cured while the guide member 130 is fixed to the lead-in hole 125, The member 130 is fixed to the barrel 120 of the lens group. Next, the lens barrel assembly 100 according to the present embodiment is completed by assembling the lens barrel 120 to the cam barrel 140.

In the lens barrel assembly 100 is completed as is coupled to a digital recording device, the lens group optical information through the member 110 closer to the optical axis (l _0), a CCD (coupled-charge device) arranged in the or CMOS (complementary (not shown) such as a metal oxide semiconductor, and is converted into an electrical signal. The electrical signals are processed by the series of function units included in the digital photographing apparatus and displayed to the user.

The optical axis error of the lens group member 110 can be easily corrected according to the adjustment of the inclination angle of the guide member 130 with respect to the lead-in hole 125 according to the lens barrel assembly 100 according to this embodiment . Accordingly, the optical axis error is corrected, and a high-quality image can be provided to the user.

In the above-described drawings, the inclination angle of the guide member 130 with respect to the inlet hole 125 is vertically adjusted, but the present invention is not limited thereto. That is, as the inclination angle of the guide member 130 about the inlet hole (125) as vertical direction, can be adjusted in the horizontal direction, if the direction perpendicular to the optical axis (l ₀₎ which may also be adjusted in the direction.

It is to be understood that although the angle of inclination with respect to the inlet hole 125 is shown as? In the figure, the inclination angle? Is not fixed. That is, the inclination angle may be larger or smaller depending on the shape of the guide member 130 (for example, the diameter of the projecting support plate 132) or the shape or size of the support plate entrance hole 125b .

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

1 is a perspective view showing a state in which a guide member is coupled to a lens barrel according to the related art.

2 is a cross-sectional view showing a state in which a guide member is coupled to a lens barrel according to the related art.

3 is an exploded perspective view schematically illustrating a lens barrel assembly according to an embodiment of the present invention.

4 is a cross-sectional view schematically showing a guide member coupled to a lens barrel according to an embodiment of the present invention.

5 is a schematic cross-sectional view of a lens barrel assembly in accordance with an embodiment of the present invention.

FIG. 6A is a cross-sectional view showing a case where the guide member is inserted into the inlet hole in parallel, and FIG. 7A is a schematic view showing the dynamics of the force formed in the three inlet holes.

FIG. 6B is a cross-sectional view showing a case where one of the guide members is drawn in at a predetermined angle of inclination with respect to the axis of the inlet hole, and FIG. 7B is a schematic view of the dynamics of forces formed in the three inlet holes.

Description of the Related Art

100: lens barrel assembly 110: lens group member

111: first lens 112: second lens

120: lens barrel 121: lens support

122: barrel body part 125: inlet hole

125a: inlet portion receiving hole 125b: support plate receiving hole

130: guide member 131:

132: protruding support plate 133:

140: Cam barrel 141: Cam groove

150:

Claims (10)

A lens group member including at least one lens disposed along the optical axis direction; A lens barrel for accommodating the lens group member; An inlet portion having a curved shape that is adjustable in an angle so as to adjust an optical axis of the lens group member while being in contact with a part of the inner wall of the inlet hole so as to be perpendicular to the optical axis direction, A guide member having a protruding portion protruding in a direction opposite to the inserting portion; And And a cam barrel having a cam groove formed in such a manner that the projection of the guide member is inserted and slid to move the lens group member along the optical axis direction, Wherein the area of the inlet that fits into the inlet hole is spherical. The method according to claim 1, Wherein at least three of the inlet holes are formed in the lens barrel so as to be symmetrical with respect to an optical axis. The method according to claim 1, Wherein the guide member is axially symmetrical. delete The method of claim 3, Further comprising a protruding support plate protruding perpendicularly to the shaft between an inlet portion of the guide member and the protruding portion. 6. The method of claim 5, Wherein the inlet hole includes an inlet portion receiving hole for receiving the inlet portion and a support plate receiving hole for receiving the protruding support plate. The method according to claim 6, Wherein the diameter of the support plate receiving hole is larger than the diameter of the inlet receiving hole. The method according to claim 6, And a bonding member is further provided between the inlet portion and the protruding support plate and between the inlet hole. The method according to claim 1, ≪ / RTI > wherein the guide member comprises aluminum. A digital photographing apparatus comprising the lens barrel assembly according to any one of claims 1 to 3 or claim 5.

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