KR20010037211A - A apparatus for barrier opening and closing of a zoom camera - Google Patents

Abstract

PURPOSE: A device for opening and shutting a barrier of a zoom camera is provided to prevent a damage of power transmission member of a shutter and a barrier by blocking driving force from the shutter through a slip of a gear part when the barrier is opened and shut by external forcible strength. CONSTITUTION: A device for opening and shutting the barrier of the zoom camera includes a barrel assembly(1), an automatic focusing lens assembly(3) having a focusing motor(9) and a focusing driving ring(23) put in the barrel assembly, a gear train(21) geared with the focusing motor and transferring driving power of the focusing motor to the focusing driving ring, a power transferring unit(25) connected to the gear train for opening and shutting a barrier only in a capturing state, a slip unit(27) blocking power transferred for opening and shutting the barrier when the barrier is opened, and a barrier assembly(5) connected to the power transferring unit.

Description

A barrier for barrier opening and closing of a zoom camera

The present invention relates to a zoom camera, and more particularly, to a barrier opening and closing device of a zoom camera having a structure in which the barrier is opened and closed by a focusing motor.

In general, a camera is an apparatus that receives light to form an image on a film, and includes a lens group that receives light reflected from a subject to focus on a film surface, an aperture that controls the amount of light that enters through the lens group, It consists of a focusing device for controlling the position of the lens so that the image of the subject is clearly imaged on the film, a film transporting device for transporting the film at regular intervals, and a shutter assembly for adjusting the time the film is exposed to light.

In particular, in order to protect the lens of the lens group mentioned above, the barrier assembly is provided in the front side of a barrel. Such a barrier assembly has a structure in which the barrier is properly opened and closed as necessary during imaging.

The opening and closing structure of such a barrier is shown in Korean Patent Application No. 98-17325 and US Patent Publication No. 4,876,563. First of all, Korean Patent Application No. 98-17325 discloses that the barrier driving lever stopped by the relay lever when the focus lens group is rotated when the driving force is transmitted through the gear train of the focusing motor is applied to the elastic force of the barrier open spring in the barrier assembly. The structure in which the barrier is opened is shown. The feature of this technology is that the rotation section of the relay lever is divided into the barrier on section and the lens feeding section. This has a structure in which the barrier is opened and closed by a power switch. Therefore, since the barrier is always open in the power-on state, the lens may be damaged if a physical collision occurs from the outside.

In addition, U.S. Patent No. 4,876,563 provides a power transmission means between the barrier and the shutter for opening and closing the barrier before and after the shutter is operated for focusing by driving the lens protection barrier by a shutter driving motor. Since the power transmission means is engaged with a plurality of gears engaged with each other, one or more of the gears meshed with each other may be damaged if the barrier is forced to the open position by any external factor.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, the technical problem to be achieved by the present invention is that when the barrier is opened at the moment the shooting is taken and the barrier is closed at the same time after the barrier is closed When the barrier is to be opened or closed by external force, it is possible to increase the reliability of the camera by blocking power from the shutter by slipping of the gear unit and preventing damage to the shutter and the power transmission member of the barrier.

An opening and closing device for realizing the above object of the present invention includes an autofocus lens assembly including a barrel assembly coupled to a camera body, a focusing motor housed inside the barrel assembly, and a focus drive ring; A gear train which is engaged with the focusing motor and transmits the power of the focusing motor to the focus driving ring, and a power transmission means coupled to any one of the gear trains to open and close the barrier only in a photographing state; When the barrier is opened through the transmission means, a slip is generated, the slip means for cutting off the power transmitted to open and close the barrier through the power transmission means, coupled with the power transmission means, and receives the driving force of the power transmission means. Barriers that can be opened or closed It includes the barrier assembly provided.

The power transmission means is rotatably coupled to a power transmission member extending in the optical axis direction to one of the gear trains, a tip portion of the power transmission member, and gear teeth are formed on the outer circumference thereof to open and close the barrier. And a gear member engaged with the barrier assembly, and an elastic member disposed on an outer circumference of the power transmission member and held by a predetermined elastic force to press the gear member in the optical axis direction.

The slip means is a sliding coupling of the power transmission member and the gear member.

In this case, when the focusing motor is driven by the release switch, the barrier opening and closing device of the zoom camera is driven by the gear train to transmit the driving force of the focusing motor, and the driving force of the gear train is transmitted to the focus driving ring to achieve focusing and slip gear. The driving force is transmitted to the member to open the barrier. In this case, the slip gear may transmit power without slipping due to the pressing force of the elastic member. When the barrier is completely open, the slip gear member overcomes the elastic force of the elastic member to cause slip and continuously transmits the driving force of the focusing motor to the focus driving ring to achieve focusing.

1 is a cross-sectional view showing the barrel portion of the zoom camera according to an embodiment of the present invention by cutting in the optical axis direction;

2 is a perspective view showing a barrier opening and closing means by a focusing motor according to an embodiment of the present invention;

3 is an exploded perspective view showing in detail FIG.

4 is a cross-sectional view of the AA ′ in FIG. 3;

5 is an operating state diagram for explaining the operating state of the present invention,

6 is a view showing a state in which the barrier is closed to explain the operating state of the present invention,

7 is a view showing a state in which the barrier is open to explain the operating state of the present invention,

Figure 8 is a state diagram showing the opening and closing state and the slip section of the shutter drive source and barrier according to the present invention.

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

1 is a cross-sectional view of the barrel in the optical axis direction in order to explain the structural positional relationship between the focus adjusting means and the barrier opening and closing means in the camera to which the opening and closing apparatus of the present invention is applied, and a barrel assembly coupled to a camera body (not shown) ( 1) and the auto focus lens assembly 3 and the barrier assembly 5 housed in the barrel assembly 1 described above.

The above-described barrel assembly 1 is composed of a plurality of barrels, and has a structure in which the zooming can be adjusted while moving in the optical axis direction by the zoom motor 7. Since the structure and operation of the barrel assembly 1 may be applied to the present invention, which is applied to a conventional zoom camera, detailed description thereof will be omitted.

The auto focus lens assembly 3 is housed inside the barrel assembly 1 described above, and focusing, which is a focus adjustment, is performed according to the movement of the barrel and the operation of the focus motor. Therefore, the above-described autofocus lens assembly 3 includes a focusing motor 9, and when the release button is operated, the focusing motor 9 is driven to perform focusing.

2 is a perspective view illustrating in detail the autofocus lens assembly and the barrier assembly. The focusing motor 9 can transmit rotational force to the drive ring 23, which is a component of the autofocus lens assembly 3, through a gear train 21 composed of a plurality of gears 11, 13, 15, 17, 19. Have a binding relationship. Therefore, the driving force of the focusing motor 9 is transmitted to the driving ring 23 to achieve focusing. In the embodiment of the present invention has been described by configuring the number of gear train 21 to five, it is not limited to this, it is possible to use one or a plurality of dogs depending on the design.

3 is an exploded perspective view showing an exploded view of the power transmission means, the slip means and the barrier assembly which are the main parts of the present invention.

The power transmission means and the slip means are coupled to any of the gears 19 of the gear train 21 to the power transmission member 25 which rotates together and is rotatably coupled to the tip of the power transmission member 25. The elastic member holding the slip gear member 27 so as to transfer the power of the slip gear member 27 and the power transmission member 25 to enable the barrier driving or to slip only the focusing. 31).

The above-described power transmission member 25 is composed of bars arranged in the optical axis direction on the subject side, and is fixedly coupled to the same axis as the gears 19 of the gear train 21. And the opposite end part to which the gear 19 of the gear train 21 is engaged, as shown in FIG. 4, has the diameter part 25a smaller than the part in which the gear 19 is engaged. . The slip gear member 27 is slidably coupled to the end portion 25a so as to be rotatable in the axial direction. Therefore, the slip gear member 27 described above is in a state capable of freely rotating about the axis of the power transmission member. The slip gear member 27 is fixed by the snap ring 29 so as not to be separated from the power transmission member 25.

The gear tooth is formed in the outer periphery of the slip gear member 27 mentioned above.

And the elastic member 31 is composed of a compression coil spring, is fitted to the outer circumference of the power transmission member 25, one side is supported on one side of the gear 19, the other side is supported on the slip gear member 27. . Therefore, when the compression coil spring presses the slip gear member 27 and a predetermined force or more acts, the slip gear member 27 has a structure in which slip is generated without power transmission.

On the other hand, in the barrier assembly 5, the barrier driving lever 33, the barrier base 35, and the pair of barriers 37 and 38 and the front panel 39 are sequentially arranged from the film surface side.

The barrier driving lever 33 has a hole 33a through which the reflected light of the subject can be incident, and a plurality of gear teeth 33b that can be engaged with the gear teeth of the slip gear member 27 described above on the outer circumferential surface thereof. ) Is formed. On one surface, barrier operation stoppers 33c and 33d are formed in the form of grooves at regular intervals in the radial direction with respect to the optical axis.

In addition, the barrier base 35 has a hole 35a through which the reflected light of the subject can be incident, and a plurality of barrier insertion holes 35b and 35c are formed on one surface at regular intervals. In addition, a plurality of barrier coupling protrusions 35d and 35e are formed to protrude toward the side facing the subject.

The barriers 37 and 38 are configured to selectively shield the optical path of the subject formed in the center of the barrier base 35, and may be rotated at one end by the barrier insertion holes 35b and 35c of the barrier base 35. Protruding portions 37a and 38a that can be coupled to each other are formed, and holes 37b and 38b are formed to be fitted to the barrier coupling protrusions 35d and 35e of the barrier base 35.

Meanwhile, one side of the plurality of springs 41 and 43 is coupled to the protrusions 37a and 38a formed in the barriers 37 and 38 in the direction in which the barriers 37 and 38 are closed. The other one side of the springs 41 and 43 forms appropriate projections 33e, 33f, shown in Figs. 6 and 7 on the film surface side of the barrier drive lever 33 to form the projections 33e and 33f. It consists of a structure that is fastened to.

The front panel 39 is coupled to the barrier base 35 so that the barriers 37 and 38 are not separated from the subject side.

On the other hand, the elastic member 31 is preferably designed to have a larger elastic force than the springs (41, 43) in order to smooth power transmission and slip.

The barrier opening / closing device of the zoom camera made in this way is in a standby state in which the release button can be pressed in the camera-on state, and this state prevents the control signal from being transmitted to the focusing motor 9 because the release button does not operate. The barrier is closed (state shown in Fig. 6). In this state, when the release button is pressed to take a picture, the focusing motor 9 is driven. The driving force of the focusing motor 9 is sequentially transmitted through the gear train 21 and transmitted to the focus driving ring 23 to start focus adjustment. At the same time, the driving force of the gear train 21 is transmitted to the slip gear member 27 through the power transmission member 25.

At this time, the slip gear member 27 is completely adhered to the snap ring 29 by the elastic member 31 formed of the compression coil spring and rotates integrally with the power transmission member 25. Therefore, the driving force of the gear train 21 is rotated through the gear tooth 33b formed in the barrier driving lever 33. Then, as the barrier driving lever 33 rotates, the elastic force of the springs 41 and 43 is overcome and rotated. At this time, the barriers 37 and 38 rotate the barrier coupling protrusions 35d and 35e about its axis. This barrier 37 38 is rotated by barrier actuating stoppers 33c and 33d of the barrier drive lever 33. Thus, barriers 37 and 38 are open in the state shown in FIG. In this state, the barriers 37 and 38 are stopped without further rotation by the barrier actuating stoppers 33c and 33d. A section B in FIG. 5 represents a section in which the barrier is opened.

As such, when the barrier is completely opened, the slip gear member 27 is slidably rotated at the outer circumference of the power transmission member 25. As described above, the sliding rotation of the slip gear member 27 is continuously transmitted to the power transmission member 25 through the gear train 21, and the elastic member 31 is stopped by the barrier driving lever 33 that is already stopped. This is because the slip gear member 27 only performs a sliding movement even when the pressure is applied to the slip gear member 27. Subsequently, the driving force transmitted to the gear 19 of the gear train 21 is transmitted to the driving ring 23 of the auto focus lens assembly 3 to move while moving from the range A to C or D in FIG. 5 (infinity). Move to C if it is in focus, and move to D if it is in near focus). And when the focus is properly adjusted, the shooting is done.

Referring to this state in more detail, FIG. 8 is a view showing the relationship between the extraction of the autofocus lever assembly and the opening and closing of the barriers 37 and 38. 38) shows the open state. At the point B, the barriers 37 and 38 are completely open. At this time, the motor rotates forward. If the motor continues to rotate forward, slip occurs in sections B and C. The autofocus lever assembly 3 moves to the point C. Minimal dispatch, which is an infinite focus at, is achieved (solid line in FIG. 8).

And when the feeding of the auto focus lever assembly 3 is rotated to the D section, the maximum feeding is made, and in this maximum feeding section (indicated by the dotted line), slip occurs from the B to the D section.

After the shooting is continued, the autofocusing lens assembly 3 is returned to its original position while the focusing motor 9 is rotated in the reverse direction by the release signal of the release button. Therefore, the slip gear member 27 is rotated in the opposite direction to the above-mentioned direction, and is returned to its original position (the position where the barrier is closed as shown in FIG. 6) by the springs 41 and 43 serving as a return.

The state in which the barrier is closed will be described in detail with reference to FIG. 8 as follows.

That is, when the motor 9 rotates in the reverse direction, the driving force of the motor 9 is transmitted to the slip gear 19 through the gear train 21, and the slip gear member 27 is rotated by the elastic force of the spring 31 so that the barrier (37, 38) are closed and slip of the power transmission member 25 and the slip gear member 27 is made (marked as ″ slip section at minimum feeding when the barrier is closed ″ in FIG. 8). 3) returns to the initial position.

After photography is taken after the maximum feeding section, i.e. near focus, the motor rotates in reverse and the driving force of the motor 9 becomes the gear train 21 at the maximum drawing section D of the auto focus lever assembly 3 (indicated by the dashed line). It is transmitted to the slip gear 19 through the slip gear member 27 is rotated by the elastic force of the spring 31 to close the barrier (37, 38), the power transmission member 25 and the slip gear member 27 The auto focus lever assembly 3 returns to the initial position while the slip is performed (marked as ″ slip section at maximum feeding when the barrier is closed ″ in FIG. 8).

Therefore, the barrier is opened only when shooting, and the barrier is closed immediately after the shooting is completed.

When the barrier opening and closing device of the zoom camera according to the present invention does not perform an operation by the release button even when the power is on, the barrier remains closed and only when the release operation is performed by the release button, the barrier is opened and the focusing is performed. The adjustment makes it possible to take pictures, which can protect the lens even when not taken, and is also effective in preventing light leakage.

In addition, when the force is applied to the position at which the barrier is opened due to external factors, slip may occur in the slip gear member, thereby preventing damage to the shutter mechanism and the barrier.

Claims (4)

A barrel assembly; An auto focus lens assembly having a focusing motor and a focus driving ring housed inside the barrel assembly; A gear train engaged with the focusing motor and configured to transmit power of the focusing motor to the focus driving ring; Power transmission means coupled to any one of the gear trains to open and close the barrier only in a photographing state; Slip means for generating a slip when the barrier is opened through the power transmission means to block power transmitted to open and close the barrier through the power transmission means; A barrier assembly coupled to the power transmission means and having a barrier capable of opening and closing the barrier by receiving a driving force of the power transmission means; Barrier opening and closing device of the zoom camera comprising a. The method of claim 1, wherein the power transmission means A power transmission member extending in the optical axis direction to one of the gear trains; A gear member disposed at one end of the power transmission member and geared to an outer circumference thereof and engaged with the barrier assembly to open and close the barrier; An elastic member disposed on an outer circumference of the power transmission member and held so as to press the gear member in an optical axis direction; Barrier opening and closing device of a zoom camera provided with. The method of claim 1, wherein the barrier assembly is A barrier driving lever having a plurality of gear teeth formed on an outer circumference thereof so as to be engaged with the slip gear member, and having a barrier actuating stopper having a plurality of grooves on one side thereof; A barrier base disposed at the front side of the barrier drive lever and having a barrier engaging projection formed thereon; A plurality of barriers which are fitted to the barrier coupling protrusion of the barrier base and have a plurality of driving protrusions protruding in the direction of the optical axis of the film, and which are formed in pairs and which are selectively opened and closed to protect the lens; A return spring coupled to one side of the barrier driving lever and the driving protrusion of the barrier to return the barrier to its original position; A front panel disposed on the film surface side of the barrier and fitted to one side of the barrier base to form a protective cover; Barrier opening and closing device of a zoom camera provided with. The barrier opening and closing apparatus of a zoom camera according to claim 2, wherein the elastic member has a greater elastic force than that of the return spring.