KR100322188B1 - Zoom lens barrel driving system for a camera - Google Patents

Abstract

A helicoid ring rotated by one zoom drive source, a focus lever assembly interlocked with the rotation of the helicoid ring, a relay lever rotated by receiving a driving force from the focus lever assembly, and a rotation action of the relay lever In this case, the position of the optical axis is changed to include a focusing lens for focusing, and the focus lever assembly has one focus lever on the output shaft of the focus lever assembly different from the center of rotation so that the rotation angle of the relay lever can be changed in multiple stages. A camera having a zoom lens barrel drive system having a surface having a radius is provided.

Therefore, zoom driving and focus adjustment can be performed using a single driving source, and the first, second, and third focuses are made to focus when the helicoid ring is moved by a focus adjusting groove and a protrusion formed in the helical ring. It has a lever, but instead of reducing the rotation angle of the first focus lever to increase the rotation angle of the third focus lever can increase the stability of the system, to simplify the components and simplify the use of space efficiently It can achieve miniaturization and lower production costs.

Description

Camera with a zoom lens barrel driving system {Zoom lens barrel driving system for a camera}

The present invention relates to a zoom camera, and more particularly, to a camera having a zoom lens barrel driving system capable of zooming and focusing using only a driving force of a zoom driving motor.

In general, a compact zoom camera includes a zoom lens barrel system having a zoom function of varying a magnification, which is a focal length of a photographing lens, and a focus function of adjusting a focal point according to a distance of a subject.

The barrel driving system of the lens shutter type camera that can adjust the zoom and focus function by using a single driving source has a structure in which focusing adjustment is performed by moving the focusing lens in the optical axis direction as the focus adjustment lever moves according to the movement of the zoom barrel. Have Most of these focus control levers have a complicated power transmission structure. In particular, when the components are reduced in order to simplify the power transmission structure, the rotation angle of the focus control lever linked to the zoom barrel may increase.

Therefore, when the rotation angle of the focus control lever is increased, there is a problem that the stability of the system is lowered.

In addition, the zoom camera requires a simple and stable power transmission structure. However, the zoom camera does not adequately respond to these requirements, and thus, the component is complicated and the barrel diameter is limited. There are some restrictions.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, the technical problem to be achieved by the present invention is to enable the zoom drive and focus control with one drive source in a compact zoom camera, and implements multi-stage focusing The present invention provides a camera having a zoom lens barrel driving system that efficiently uses the space of a barrel, aims to simplify the structure, and can be miniaturized and lowered in price.

1 is a front view showing the main part of the camera to illustrate an embodiment of the present invention,

2 is a plan view of FIG.

3 is an exploded perspective view showing an exploded barrel assembly for explaining an embodiment according to the present invention;

4 is a front view showing the zoom ring of FIG.

5 is a perspective view showing in detail the inside of the helicon ring of the present invention,

6 is a developed view showing the inside of the heloidoid ring of the present invention in a developed state;

FIG. 7 is a cross-sectional view taken along the line AA ′ of FIG. 6;

8 is a view for showing the coupling relationship of the focusing lever coupled to the shutter block which is the main part of the present invention;

9 is an exploded perspective view showing an exploded view of FIG. 8;

10 is a front view of the shutter block,

11 is an operating state diagram for explaining the operation of the focus lever;

It is a figure for demonstrating a focus adjustment amount detection means.

The present invention provides a zoom driving source; A helicoid ring rotated by the zoom drive source; A focus lever assembly that cooperates with rotation of the helicoid ring; A relay lever configured to receive the driving force of the zoom driving source from the focus lever assembly and to rotate the relay lever; Its position is changed by the action of the rotation of the relay lever includes a full lens for focusing,

The first focus lever of the focus lever assembly contacts the focus adjustment groove and the focus adjustment protrusion provided in the helical ring, the second focus lever is coaxially installed with the first focus lever, and the third focus lever is the second focus lever. Provided is a camera having a zoom lens barrel driving system engaged with a focus lever and contacting the relay lever to rotate in a direction where focus can be adjusted.

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

1 is a front view showing the main part of the camera for explaining the embodiment of the present invention, Figure 2 is a plan view of Figure 1, the camera body 1 and the zoom motor 3 and the zoom driving source and the zoom motor ( The power transmission gear group 5 for decelerating the rotation drive force of 3) and transmitting it to a barrel is shown.

On the upper surface of the camera body 1, tele and wide switches 7 and 9, a release switch 11 and the like are arranged for zooming. The tele and wide switches 7 and 9 are connected to the control printed circuit board 13 housed in the camera body 1 so as to drive the zoom motor 3.

The zoom motor 3 is housed in the camera body 1 and is connected to the control printed circuit board 13 so that zooming and focusing are performed simultaneously by forward and reverse rotation according to the operation of the tele and wide switches 7 and 9. It is.

The power transmission gear group 5 includes the first reduction gear 15 connected to the driving force of the zoom motor 3, the second reduction gear 17 engaged with the first reduction gear 15, and the first reduction gear 15. It consists of the 3rd reduction gear 19 meshed with the 2nd reduction gear 17, and the 4th reduction gear 21 meshed with the 3rd reduction gear 19. As shown in FIG. The power transmission gear group 5 serves to reduce the driving force of the zoom motor 3, but the number is not limited and can be installed in a large number depending on the efficiency of the design.

The barrel idle gear 23 is engaged with the fourth reduction gear 21 and the zoom motor 3 is mounted on the zoom lens barrel assembly 25 housed in the camera body 1 to move the barrel in the optical axis direction. It is installed in a structure that can transmit the driving force.

Figure 3 is an exploded perspective view showing an exploded barrel assembly according to the present invention. The lens base 27 is fixedly coupled to the camera body 1, and a plurality of helicoid grooves 27a are formed on the inner circumferential surface of the spiral and a plurality of linear guide grooves 27b in the optical axis direction. The barrel idle gear 23 engaged with the fourth reduction gear 21 is coupled to one side of the lens base 27.

The helicoid ring 29 is coupled to the helicoid groove 27a formed in the inner circumferential surface of the lens base 27 to form a heloidoid protrusion 29a at one end of the outer circumferential surface so as to rotate and move in the optical axis direction. The gear 29b is formed in the adjacent part of this heloidoid protrusion 29a so that it may engage with the barrel idle gear 23. As shown in FIG. The gear 29b is engaged with the barrel idle gear 23 to receive the driving force of the zoom motor 3 to rotate and move the helicoid ring 29 in the optical axis direction.

On the inner circumferential surface of the helicoid ring 29, a zoom ring movement guide groove 29c in the helical direction and a rear lens group frame movement guide groove 29d are also formed in the helical direction.

In addition, a focus adjusting groove 29e is formed on the inner circumferential surface of the heloid ring 29.

Guide plate 31 is coupled to the film surface side of the helicoid ring 29 so as to move relative to the helicoid ring 29 and the zoom ring 35 can move straight in the optical axis direction. The guide plate 31 described above has a helical ring in a linear guide groove 27b (omitted invisible numbers are omitted) in which protrusions 31d, 31e, and 31f are formed inside the lens base 27 on the outer circumference. It is coupled to the (29) to perform a relative rotational movement is a structure capable of sliding linear movement in the optical axis direction.

Three straight guide portions 31a, 31b, and 31c are formed in the guide plate 31 at regular intervals to protrude in the optical axis direction.

The rear lens frame 33 is formed with a plurality of guide protrusions 33a and 33b on the outer circumferential surface thereof, and the reference numerals of the invisible portions are omitted. The guide protrusions 33a and 33b are coupled to the rear lens group movement guide grooves 29d formed on the inner surface of the helical ring 29 to allow the rear lens group frame 33 to move in the optical axis direction.

In addition, the rear lens group frame 33 is formed with three straight guide portions 33c, 33d, 33e in the optical axis direction.

The zoom ring 35 has a helicoid portion 35a formed at one side of the outer circumferential surface thereof, and is coupled with the zoom ring movement guide groove 29c of the helicoid ring 29 to go straight in the optical axis direction by the straight guide plate 31. It has a removable structure.

4, the guide grooves 35b, 35c, and 35d into which the straight guide parts 31a, 31b, and 31c of the straight guide plate 31 can be fitted, as shown in FIG. Is formed. Accordingly, the zoom ring 35 has a structure in which the zoom ring 35 moves straight in the optical axis direction by the straight guide portions 31a, 31b, and 31c of the straight guide plate 31.

In addition, the zoom ring 35 is formed with another guide grooves 35e, 35f, and 35g into which the three straight guide parts 33c, 33d, and 33e formed in the rear lens frame 33 are fitted. Therefore, the rear lens frame 33 has a structure capable of relative movement in the optical axis direction with respect to the zoom ring 35.

In addition, the shutter block 37 is coupled to the inside of the object side of the zoom ring 35. On the inner circumferential surface of the shutter block 37, a spiral helical portion 37a is formed.

The group lens 39 is coupled to the helicoid portion 37a of the shutter block 37, and this coupling is formed on the outer circumferential surface of the group lens 39. The structure is fitted to the cord portion 39a and the helicoid portion 37a of the shutter block 37. Therefore, the front lens group 39 is to be adjusted in focus while rotating and moving in the optical axis direction.

On the other hand, focusing adjustment is performed when the helicoid ring 29 moves forward or backward with respect to the subject side in conjunction with the rotation of the helicoid ring 29 so that the focusing can be adjusted in conjunction with zooming. Means are installed.

The focus adjusting means is coupled to the first, second and third focus levers 101, 103, and 105 which rotate in conjunction with the helicoid ring 29 to be rotatable by the zoom ring 35. In addition, the relay lever 107 is coupled to the outer circumference of the front lens group 39 to rotate the front lens lens 39 in the optical axis direction in conjunction with the first, second and third focus levers 101, 103 and 105 to adjust the focus. It has a structure that can be achieved.

The main part of the helicoid ring 29 serving as the focus adjusting means will now be described in more detail. FIG. 5 is an enlarged perspective view showing the inside of the helical ring in detail, FIG. 6 is an exploded view showing a state where the inner surface of the heloid ring is developed, and FIG. 7 is A-A of FIG. Is a cross-sectional view of the incision.

As described above, the focus adjustment groove 29e is formed in the helical direction in the helical ring 29. A plurality of focus adjustment protrusions 29f, 29g, 29h, 29i protrude at regular intervals in the focus adjustment groove 29e. At this time, the focus adjustment protrusions 29f, 29g, 29h, and 29i have one side of which constitutes a steep slope 29j, and the other side of which has a relatively gentle slope 29k as compared to the steep slope 29j. At this time, the direction of the steep inclination surface 29j is to adjust the focus to the near focus control state when the helicoid ring 29 goes straight and rotates in the direction of moving forward with respect to the subject side.

Hereinafter, the structure of the 1st, 2nd, 3rd focus lever 101, 103, 105, and the relay lever 107 is demonstrated in more detail.

FIG. 8 is a view illustrating a combined state of the first, second, and third focus levers and the relay lever, and FIG. 9 is an exploded perspective view for showing the components of FIG. 8 in detail.

The first focus lever 101 is rotatably coupled by the zoom ring 35. One side of the first focus lever 101 is in close contact with the above-described focus adjustment groove 29e (shown in FIG. 7), and the other side is fixedly coupled to the second focus lever 103 on the same rotation axis. . The second focus lever 103 extends one side and includes a gear portion 103a. The third focus lever 105 has another gear portion 105a (shown in FIG. 11) to be engaged with the gear portion 103a of the second focus lever 103 and the shutter block 37. It is rotatably hinged to. The third focus lever 105 includes extension portions 105b and 105c extending left and right with respect to the rotation center. The extension part 105b is always returned to the initial position by the return spring 109 which is supported by the stopper 110 formed in the shutter block 37. This initial position is determined by another stopper portion 111 (shown in FIG. 11) provided in the shutter block 37. Further, the tip portion of the third extension lever 105 of the third focus lever 105 has a step shape. The extension portion 105c of the third focus lever 105 has a step shape so that the focus area is determined at each end, and each step of the step shape is sequentially formed from the rotation center of the third focus lever 105. Each has a different distance (l1, l2, l3) (shown in FIG. 10). Therefore, the rotation amount of the relay lever 107 can be changed to change the feeding amount of the lens. The shape of each step portion is ideally an arc shape having a center of rotation of the third focus lever as a counter, and may be a straight line.

The relay lever 107 is provided with a contact portion 107a with one side extended. The contact portion 107a has a structure in which the tip portion is bent to one side and the tip portion is in close contact with the tip portion of the extension portion 105c formed in the step shape of the third focus lever 105. On the other hand, the relay lever 107 has a spring hook portion 107b extending on the one side in the outward direction from the center of rotation, so that the spring hangs 107b and the spring 113 on the shutter block 37 to contact the contact portion ( 107a always has a structure in close contact with the stepped portion that is the extension portion 105c of the third focus lever 105.

The third focus lever 105 includes a gear portion 105a meshed with the gear portion 103a of the second focus lever 103 and extension portions 105b and 105c receiving the rotational force of the gear portion 105a. Is made of.

On the other hand, it is preferable that the relay lever 107 is integrally fixed to the front lens group 39 by bonding or the like.

In addition, a shutter printed circuit board 115 is coupled to one side of the shutter block 37, and contacts the shutter printed circuit board 115 to correspond to the shutter printed circuit board 115 so that the extension portion 105c of the third focus lever 105 is connected. At the bottom, a focus contact 117 (shown in FIG. 12) is coupled. This is for enabling the detection of the focus adjustment state as the third focus lever 105 moves. The focus contact 117 has a function of sensing the focus adjustment amount by relatively moving in contact with the shutter printed circuit board 115 and transferring the detected signal to a separate control unit.

According to this configuration will be described in detail the process of adjusting the focus when zooming as follows.

When the tele or wide switches 7 and 9 are operated while the camera is turned on, the zoom motor 3 is driven to rotate the barrel idle gear 23 through the power transmission gear group 5. The barrel idle gear 23 is engaged with the gear 29b of the helicoid ring 29 to rotate the helicoid ring 29. Then, the helicoid ring 29 has a spiral helicoid formed on the outer circumference thereof to slide with the helicoid groove 27a to rotate and move in the optical axis direction. As the helicoid ring 29 moves, the guide plate 31 also moves straight in the optical axis direction. As the helicoid ring 29 and the guide plate 31 move in the optical axis direction, the rear lens frame 33 and the zoom ring 35 move in the optical axis direction.

As the zoom ring 35 moves, the entire lens frame 39 also moves in the optical axis direction, so that zooming is realized.

At this time, the first focus lever 101 is a steep inclined surface 29j of the focus adjustment protrusion 29h in a state in which one side is in close contact with the focus adjustment groove 29e (shown in FIG. 7), and another focus adjustment protrusion is illustrated in the drawing. However, for convenience, the focusing protrusion may be moved by way of example). The first focus lever 101 then rotates counterclockwise (shown in FIG. 11) about the axis to rotate the second focus lever 103 also counterclockwise. Then, the second focus lever 103 transmits the rotational force to the other gear portion 105a of the third focus lever 105 through the gear portion 103a. Accordingly, the third focus lever 105 overcomes the elastic force of the return spring 109 and rotates clockwise.

At this time, the front end of the relay lever 107 is in close contact with the step shape of the front end of the extension part 105c of the third focus lever 105, and then moves to another step side. As the relay lever 107 rotates as described above, the distance of each step is changed from the center to change the amount of rotation, and the total lens 39 moves along the helical portion 37a of the shutter block 37 so that the amount of feeding is reduced. By changing, focus adjustment is made.

In such a state, if the magnification is continuously increased, one end of the first focus lever 101 may move beyond the focus adjustment protrusion 29h to the gentle inclined surface 29k to perform the next focus adjustment. And when the helical ring 29 moves to the film surface side by the operation of the wide switch 7, the relay lever 107 is returned to the initial state by the return spring 109 and the spring 113. In this case, the first focus lever 101 has a rotation angle of about the steep slope of the focus control protrusion 29h, that is, the rotation angle of the first focus lever 101 as much as it moves in one direction with respect to the normal line. Instead of reducing the rotation angle of 101, the rotation angle of the third focus lever 105 is increased. In other words, by increasing the rotation angle of the output stage compared to the rotation angle of the input stage it is possible to achieve a stable focus control in the case of a multi-stage structure. In the exemplary embodiment of the present invention, the focus control is performed by moving the first focus lever 101 on the steep inclined surface of the focus adjustment protrusion. However, the focus control may be performed by moving in the reverse direction.

Meanwhile, in the above-described embodiment, a structure in which one end of the extension portion 105c of the third focus lever 105 is stepped and focused in multiple stages is described, but the extension portion 105c of the third focus lever 105 is described. The focusing adjustment may be changed linearly in the case where one end of) is in the form of an inclined straight line.

In addition, as the third focus lever 105 rotates, the focus contact 117 moves along the shutter printed circuit board 115 to be in contact with each other to detect the focusing adjustment amount.

Camera having a zoom lens barrel driving system according to the present invention, the zoom drive and the focus can be adjusted by a single drive source, the helicoid ring is formed by the focus adjustment groove and the protrusion formed in the inside of the helicoid ring The first, second, and third focus levers are provided to focus when moving, but instead of reducing the rotation angle of the first focus lever, the rotation angle of the third focus lever is increased to increase the stability of the system. Simplification and miniaturization can be achieved by simplifying members and using space efficiently, and production costs can be reduced.

In addition, a means for detecting the focus adjustment amount is provided, and the stability of the focus adjustment can be achieved.

Claims (7)

One zoom driving source; A helicoid ring rotated by the zoom drive source; A focus lever assembly that cooperates with rotation of the helicoid ring; A relay lever configured to receive the driving force of the zoom driving source from the focus lever assembly and to rotate the relay lever; A position in the optical axis direction is changed by the rotation of the relay lever to include a focusing lens for focusing, The focus lever assembly has a zoom lens barrel drive system, characterized in that one focus lever on the output shaft of the focus lever assembly has a surface having a different radius from the rotation center so as to vary the rotation angle of the relay lever in multiple stages. camera. The method of claim 1, wherein the first focus lever of the focus lever assembly is in contact with the focus adjustment groove and the focus adjustment protrusion provided in the helicoid ring, the second focus lever is coaxially installed with the first focus lever, And a focus lever is engaged with the second focus lever and has a zoom lens barrel driving system which contacts the relay lever to rotate in a direction in which focus can be adjusted. 3. The zoom lens barrel of claim 2, wherein the third focus lever has a multi-stage in which a surface in contact with the relay lever has an arc having a different diameter at a rotational center so as to realize multi-stage focusing by varying the total lens feeding amount. Camera with drive system. 3. The camera of claim 2, wherein the third focus lever is linearly formed such that a surface in contact with the relay lever has a proportional focus value. The zoom lens barrel driving system of claim 2, wherein the third focus lever includes a contact disposed on one surface of the third focus lever to detect a focus adjustment amount, and the shutter block includes a printed circuit board that is in contact with the contact. Camera. The method of claim 2, wherein the third focus lever A gear part engaged with the second focus lever, An extension part coupled to the gear part to receive a rotational force, A camera having a zoom lens barrel drive system having a. The method of claim 2, wherein the third focus lever A stopper installed in the shutter block to limit movement to the initial position, A return spring mounted to the shutter block and supported by the third focus lever to be in close contact with the stopper; A camera having a zoom lens barrel drive system having a.