KR20070089291A - A zoom lens assembly - Google Patents

Abstract

A zoom lens assembly is provided to relatively move two lens groups with one driving source and to secure stable zooming and focusing operations for a subject by equally joining the lens groups and a case at several spots. In a zoom lens assembly, a cylindrical guide barrel(10) fixed to an electronic device has at least two guide elongated holes formed along a circumferential direction. A cam barrel(50) rotatably fitted to the outside of the guide barrel has upper and lower distance adjusting holes(52,54) vertically formed in a pair, disposed oppositely to each other to change a gap in a direction parallel to an optical axis according to rotation, and arranged on parts corresponding to the guide elongated holes at the same number of pairs along a circumferential direction. An upper lens barrel(30) contained in the guide barrel has upper guide pins(32) protruded from the surface and inserted and combined to the guide elongated holes and the upper distance adjusting holes to move along the holes. A lower lens barrel contained in the guide barrel has lower guide pins(42) protruded from the surface and inserted and combined to the guide elongated holes and the lower distance adjusting holes to move along the holes. The upper and lower guide pins are guided through the upper and lower distance adjusting holes according to the rotation of the cam barrel and vertically moved along the guide elongated holes, to perform zooming and focusing functions by changing a gap of the lower lens barrel for the upper lens barrel.

Description

Zoom lens assembly {A ZOOM LENS ASSEMBLY}

Detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which numerals designate corresponding parts in the drawings.

1 is an assembled perspective view showing the overall configuration of a zoom lens assembly according to the present invention,

2 is a longitudinal cross-sectional view of FIG. 1;

3 is an exploded perspective view of FIG. 1,

4 is a longitudinal cross-sectional view of FIG.

FIG. 5 is a longitudinal cross-sectional view of the lens groups of FIG. 4 separated from each other.

6 is a front view showing the configuration of the cam barrel in the present invention,

7 is an exploded view showing the cylindrical cam barrel shown in FIG.

8 to 10 are state diagrams of use of the zoom lens assembly of the present invention.

** Explanation of symbols for main parts of drawings **

10: guide barrel 12: lower seat

14: upper cylindrical portion 16: the lens

18: guide officer 20: circuit board

22: image sensor 30: upper lens barrel

32: upper guide pin 40: lower lens barrel

42: lower guide pin 50: cam barrel

52: upper distance adjustment hole 54: lower distance adjustment hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens assembly for use in a camera module of an electronic device, and more particularly to stable zooming and focusing on a subject by moving two lens groups relative to one driving source. And a zoom lens assembly that can be accurately implemented.

Recently, as mobile camera products to which mobile camera modules are applied are becoming more complex, multifunctional, and miniaturized, mobile camera modules are also becoming smaller and lighter. In particular, high resolution image sensors (CCD, CMOS) have been commercialized for such a camera module, and the lens assembly of the camera module has also been miniaturized due to the miniaturization and high precision of the corresponding lens. The optical system of such a miniaturized camera module requires, among other things, a zoom function for changing the magnification of a subject and a focusing function for clearly viewing a predetermined object. Here, zoom means changing the focal length of the lens to change its size in the process of forming an image on the image sensor, and focusing means adjusting the distance between the lens and the sensor or changing the curvature of the lens. This means that the image is sharply imaged on the image sensor.

On the other hand, the lens optical system for the zoom is generally composed of two or more lens groups, by moving the two or more lens groups to realize the zoom function by adjusting the relative distance to the image sensor. Therefore, in order for the camera module to provide a zoom function, at least one lens group must have a movable structure.

In the zoom function as described above, the size of an image of a subject formed on an image sensor changes according to the movement of the lens group. That is, the magnification determined by zooming changes the position at which the image is formed according to the distance between the subject and the lens. In order to correct this, two or more lens groups move relative to each other. At this time, in the zoom lens composed of two or more groups, the position change of each group is not linear, so the cam is configured to induce nonlinear motion to zoom and focus. There are two or more problems, including this manual. As a result, the conventional method requires a separate drive source for implementing the zoom and focusing functions, for example, a manual, a step motor, a piezo, a VCM, etc., and the configuration is complicated.

Moreover, in mobile cameras, the design and manufacture focusing on miniaturization, light weight, low cost, and low power consumption. As the combination of the lens group and the case is combined with one coupling pin, driving of the lens group for zooming and focusing is performed. Not only is it stable but also has a weak point of impact due to the weak coupling structure of the components.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, and to improve the coupling structure by relatively moving the two lens groups with one driving source while equally combining the lens group and the case in various places. As a result, a zoom lens assembly capable of stably and precisely implementing zoom and focusing on a subject is provided.

A zoom lens assembly according to the present invention for achieving the above object is a lens assembly for mounting a focus on the image sensor so that the subject is imaged, the fixed to the electronic device, the guide holes in the optical axis direction along the circumferential direction 2 More than one cylindrical guide barrel; It is coupled to the outside of the guide barrel is rotatably fitted, the upper distance adjusting ball and the lower distance adjusting ball is formed up and down pairs in the direction parallel to the optical axis fluctuates in accordance with the rotation, the guide hole along the circumferential direction Cam barrels formed in the same number of pairs in the portion corresponding to the field; An upper lens barrel accommodated in the guide barrel and having upper guide pins protruding from the surface and inserted into and coupled to the guide holes and the upper distance adjusting holes; And a lower lens barrel that is received in the guide barrel and has lower guide pins protruding from the surface and inserted into and coupled to the guide holes and the lower distance adjusting holes, wherein the upper portion is rotated by the cam barrel. The guide pins and the lower guide pins are guided by the upper distance adjusting holes and the lower distance adjusting holes, respectively, and the distance between each other is varied while moving in the vertical direction along the guide holes.

According to the embodiment, it is preferable that the guide pin, the guide hole, the upper distance adjusting hole and the lower distance adjusting hole are provided at three positions respectively corresponding to each other at right angles along the circumferential direction.

Further, the upper distance adjustment ball and the lower distance adjustment hole is a shape that is connected to the horizontal guide hole and the inclined guide hole, are formed to face each other and spaced apart at a predetermined interval, the state in which both the upper distance adjustment ball and the lower distance adjustment ball are in the lowest position In the closed mode, the upper distance adjusting hole is the highest value and the lower distance adjusting hole is in the lowest position, and the tele mode in which both the upper distance adjusting hole and the lower distance adjusting hole are present at the highest value. Characterized in that the shape to support.

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

1 is an assembled perspective view showing the overall configuration of a zoom lens assembly according to the invention, Figure 2 is a longitudinal cross-sectional view of FIG. 3 is an exploded perspective view of FIG. 1, and FIG. 4 is a longitudinal cross-sectional view of FIG. 3. FIG. 5 is a longitudinal cross-sectional view of the lenses of the lens groups in FIG. 4, respectively. Hereinafter, the configuration of the zoom lens assembly will be described in detail with reference to the drawings.

As shown in the zoom lens assembly of the present invention, the guide barrel 10 has a lower seating portion 12 which is seated and fixed to the circuit board 20 and an upper cylindrical portion extending upward from the lower seating portion 12 ( 14). In particular, the lens 16 is mounted inside the lower seating part 12 of the guide barrel 10, and the image sensor 22 is attached to the circuit board 20 corresponding to the inside of the lower seating part 12. have. In addition, the upper cylindrical portion 14 is formed with a guide hole 18 in the vertical (optical axis) direction, the guide hole 18 is at least two, preferably at least equal to the upper cylindrical portion (14) As in the embodiment, three are formed in parallel. That is, three guide holes 18 are formed in the upper cylindrical portion 14 in parallel in the optical axis direction at intervals of 120 degrees along the circumferential direction. The upper lens barrel 30 and the lower lens barrel 40 are accommodated and mounted inside the upper cylindrical portion 14 of the guide barrel 10. In particular, the upper lens barrel 30 and the lower lens barrel 40 Three guide pins 32 and 42 protrude outward from the surface corresponding to the guide holes 18 of the upper cylindrical portion 14, respectively. The upper guide pins 32 of the upper lens barrel 30 and the lower guide pins 42 of the lower lens barrel 40 which protrude in this way are inserted into the vertical guide holes 18 vertically to protrude.

The upper and lower guide pins 32 and 42 of the upper lens barrel 30 and the lower lens barrel 40 protruding the guide holes 18 of the guide barrel 10 are outside the upper cylindrical portion 14 of the guide barrel 10. Is inserted into the upper distance adjusting holes 52 and the lower distance adjusting holes 54 of the cam barrel 50 to be rotatably fitted in. That is, the upper guide pins 32 of the upper lens barrel 30 are inserted into and moved along the upper distance adjusting holes 52 of the cam barrel 50, and the lower guide pins 42 of the lower lens barrel 40 move. ) Are inserted into the lower distance adjusting holes 54 of the cam barrel 50 to move along. To this end, the upper distance adjusting holes 52 and the lower distance adjusting holes 54 of the cam barrel 50 are also inserted into the upper guide pins 32 and the lower lens barrel of the upper lens barrel 30, respectively. Three pairs, corresponding to the lower guide pins 42 of 40, are formed at equal intervals along the circumferential direction of the cam barrel 50. The upper distance adjusting hole 52 and the lower distance adjusting hole 54 of the cam barrel 50 are formed in a linear shape in which the interval varies in a direction parallel to the optical axis direction as shown in the drawing. It will be described later in detail with reference to 6 and 7.

By the above-described coupling structure, the upper guide pins 32 of the upper lens barrel 30 pass through the guide holes 18 of the guide barrel 10 inside the guide barrel 10 of the cam barrel 50. Inserted into the upper distance adjusting holes 52, the lower guide pins 42 of the lower lens barrel 40 penetrates through the guide holes 18 of the guide barrel 10 in the inside of the guide barrel 10, and the cam barrel It is inserted into the lower distance adjusting holes 54 of the 50. In particular, the upper lens barrel 30 and the lower lens barrel 40 accommodated inside the guide barrel 10 and moving in the vertical direction (optical axis direction) are three guide pins 32 protruding at equal intervals from the surface thereof. Since it is coupled to the guide barrel (10) and the cam barrel (50) by 42, three positions are supported at a right angle when viewed in the circumferential direction, so that a stable lifting movement is possible, and as a result, the upper lens barrel when zooming or focusing is driven. 30 and the shake of the lenses mounted on the lower lens barrel 40 can be removed. Of course, lenses are mounted on the upper lens barrel 30 and the lower lens barrel 40, respectively, along the optical axis (vertical direction). In the present embodiment, two lenses 34a and 34b are attached to the upper lens barrel 30. It is mounted in a group, and the lower lens barrel 40 is mounted in a group of three lenses (44a ~ 44c).

Cam barrel 50 fitted to the outside of the guide barrel 10 is rotatably coupled in place in the guide barrel 10, the upper distance adjusting holes 52 of the cam barrel 50 when the cam barrel 50 is rotated The upper guide pins 32 of the upper lens barrel 30 and the lower guide pins 42 of the lower lens barrel 40 are respectively moved along the lower distance adjusting holes 54, wherein the upper and lower guide pins 32 are moved. 42 is coupled to the guide hole 18 of the guide barrel 10 which is fixed to the electronic device, so that the movement direction is restricted so as to move only in the vertical direction, the upper lens barrel 30 and the lower lens barrel ( 40 is guided by the upper distance adjustment hole 52 and the lower distance adjustment hole 54, the guide pins (32, 42) are guided up and down while moving the upper distance adjustment hole 52 and the lower distance adjustment hole (54) Relative spacing changes according to the top and bottom spacing of. As a result, zooming and focusing are performed according to the distance change of the upper lens barrel 30 and the lower lens barrel 40, thereby enabling adjustment to the wide mode and the tele mode.

As described above, the present invention focuses by rotating the cam barrel 50 to change the distance between the upper lens barrel 30 and the lower lens barrel 40. As the driving force for rotating the cam barrel 50, the cam barrel 50 is driven. The cam barrel 50 may be rotated by protruding a knob (not shown) using manual power or by connecting a driving source such as a motor (not shown) to the cam barrel.

6 is a front view showing the configuration of the cam barrel in the present invention, Figure 7 is a development view showing the cylindrical cam barrel shown in FIG.

FIG. 6 shows the cylindrical cam barrel 50 as seen from the front, and when it is cut and developed in a vertical direction at one point, it is as shown in FIG. 7. As shown in FIG. 7, three pairs of upper and lower distance adjusting holes 52 and 54 are formed in the cam barrel 50 at equal intervals. In particular, the upper distance adjusting hole 52 and the lower distance adjusting hole 54 are roughly N-shaped guide holes formed by connecting the horizontal guide holes 52a and 54a and the inclined guide holes 52b and 54b to face each other. If one side is a parallel section from the position facing up and down, the section facing it becomes an inclined section, and the interval in the Y direction is changed according to the variation (actual rotation) in the X direction. By this shape, the upper distance adjusting hole 52 and the lower distance adjusting hole 54 guide the upper guide pin 32 and the lower guide pin 42 fitted to them, respectively, according to the change in the gap in the Y direction. Zooming and focusing are realized by varying the distance between the upper lens barrel (not shown) and the lower lens barrel (not shown).

7 (i) is an operating position of the close mode in which both the upper distance adjusting hole 52 and the lower distance adjusting hole 54 are at the lowest position, and FIG. 7 (ii) is the upper distance adjusting hole. Reference numeral 52 is a rising position exists at the highest value and the lower distance adjusting hole 54 is a wide mode operating position in the state that exists at the lowest position, the same position as in Fig. 7 (i), I) is the tele mode in which the upper distance adjusting hole 52 is the same highest value as in FIG. 7 (ii) and the lower distance adjusting hole 54 is raised in the highest value in FIG. The operating position of. For example, if the upper and lower guide pins 32 and 42 are positioned at the positions of Fig. 7 in the upper and lower distance adjusting holes 52 and 54, the operation will be performed in a close mode. (Ii) When the upper and lower guide pins 32 and 42 are located at the position, the device operates in a wide mode, and when the upper and lower guide pins 32 and 42 are positioned at the position (i) of FIG. It works. A method of adjusting the operation mode of the lens by guiding the upper and lower guide pins 32 and 42 according to the positions of the upper and lower distance adjusting holes 52 and 54 will be described in detail below with reference to FIGS. 8 to 10. .

8 to 10 are diagrams showing the state of use of the zoom lens assembly of the present invention. In particular, FIG. 8 corresponds to the position (b) of FIG. 7 and shows a state in which the upper lens group and the lower lens group are positioned at the lowest position. 7 is a position corresponding to position (ii) of FIG. 7, and the upper lens group is positioned at the highest position and the lower lens group is positioned at the lowest position. FIG. 10 corresponds to the position (i) of FIG. 7. All of the lower lens groups are positioned at the top. The operation of the present invention will now be described in detail with reference to these figures.

8, the cam barrel 50 is rotated to reach the position (ii) of FIG. 7 in a close mode, that is, in a state in which both the upper lens barrel 30 and the lower lens barrel 40 are at the lowermost positions. The upper guide pins 32 of the lower lens barrel 30 are guided along the upper distance adjusting hole 52 of the cam barrel 50 inclined upwardly at the lowest position, and the vertical guide hole 18 of the guide barrel 10 is formed. ) And the image moves upward to the highest value, and at the same time, the lower guide pins 42 of the lower lens barrel 40 follow the lower distance adjustment hole 54 of the cam barrel 50 which is horizontal to the lowest position. As it moves, movement does not occur in the vertical direction and thus exists at the lowest position. As a result, as shown in FIG. 9, the upper lens barrel 30 changes to the uppermost position and the lower lens barrel 40 is kept at the lowermost position as it is, so that the gap between the upper lens barrel 30 and the lower lens barrel 40 is maintained. Is moved away from the close mode in FIG. 8 to the wide mode in FIG. 9.

When the cam barrel 50 is rotated to the position of FIG. 7 again in this wide mode, the upper guide pins 32 of the upper lens barrel 30 are horizontal upper distance adjusting holes 52 as shown in FIG. The top guide position of the lower lens barrel 40 and the lower guide pins 42 are lifted by the inclined bottom distance adjusting holes 54 to move to the top position, all present in the top position. Is driven in tele mode.

As described above, the zoom lens assembly according to the present invention moves the two lens groups relatively with one driving source, while equally combining the lens group and the case in various places, thereby improving the coupling structure to zoom the subject ( There is an effect that stable and precise zoom and focusing can be achieved.

Furthermore, according to the present invention, since there is only one driving source, the structure thereof is simple, so that miniaturization is possible, and therefore, the power consumption can be reduced. In addition, since the lens and the sensor are set to focus at infinity from the initial position, that is, from the wide position, when driving the zoom lens in the zoom lens of the camera module, the relative distance at each step is adjusted by rotating the cam barrel. Focusing is easy. In particular, when the object is very close, the cam barrel can be used to maximize the distance between the lens group and the image sensor, and focusing is possible, and it is easy to switch from wide to tele and vice versa. .

The zoom lens assembly according to the present invention described above has a zoom and focusing function including a manual, and can be installed in a mobile device such as a mobile phone and used to photograph a subject. The present invention can be applied not only to mobile electronic devices such as mobile phones and PDAs, but also to communication devices such as notebook computers and computers, as well as all devices that apply images as input devices.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

Claims (3)

A lens assembly mounted on an electronic device and focused to capture an image of an object on an image sensor, A cylindrical guide barrel fixed to the electronic device and formed with at least two guide holes in the optical axis direction along the circumferential direction; It is coupled to the outside of the guide barrel is rotatably fitted, the upper distance adjusting ball and the lower distance adjusting ball is formed up and down pairs in the direction parallel to the optical axis fluctuates in accordance with the rotation, the guide hole along the circumferential direction Cam barrels formed in the same number of pairs in the portion corresponding to the field; An upper lens barrel which is accommodated in the guide barrel and has upper guide pins protruding from the surface and inserted into the guide holes and the upper distance adjusting holes and movably coupled thereto; And A lower lens barrel which is received in the guide barrel and has lower guide pins protruding from the surface and inserted into the guide holes and the lower distance adjusting holes and movably coupled thereto; As the cam barrel rotates, the upper guide pins and the lower guide pins are guided by the upper distance adjusting holes and the lower distance adjusting holes, respectively, and move in the vertical direction along the guide holes. A zoom lens assembly, characterized in that to perform a zoom and focusing function through the variation of the gap between the lower lens barrel. The zoom lens assembly of claim 1, wherein the guide pin, the guide hole, the upper distance adjusting hole, and the lower distance adjusting hole are provided at three positions corresponding to each other at an equilateral angle along the circumferential direction. According to claim 2, wherein the upper distance adjustment hole and the lower distance adjustment hole is a shape that is connected to the horizontal guide hole and the inclined guide hole, are formed to face each other and spaced apart from each other, The close mode in which both the upper distance adjusting hole and the lower distance adjusting hole exist in the lowest position, the wide mode in which the upper distance adjusting hole is the highest value and the lower distance adjusting hole is in the lowest position, and the upper distance A zoom lens assembly, characterized in that the adjustment hole and the lower distance adjustment hole is in a shape that supports the tele mode in a state that exists in the highest value.

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