KR19990003465A - Aperture Assembly of Camera Recorder - Google Patents

Abstract

Disclosed is an aperture assembly of a camera recorder. According to the invention, the base member; Drive means installed under the base member; First and second shutter plate members embedded in the base member to form a variable light passage hole; And a transmission means for transmitting a driving force of the driving means to the first and second shutter plate members, wherein the aperture assembly of the camera recorder comprises guiding the first and second shutter plate members inside the sidewall of the base member. An aperture of a camera recorder is provided, characterized in that at least one boss is formed. In the present invention, it is possible to control the shutter plate aperture in a stable manner, and to prevent a sudden change in illuminance when reproducing the image captured by the camera recorder, and to reduce the weight of the aperture assembly.

Description

Aperture Assembly of Camera Recorder

The present invention relates to an aperture assembly of a camera recorder, and more particularly, to an aperture assembly of a camera recorder capable of preventing the fluctuation of a shutter, which causes a sudden change in screen illuminance, when a screen shot by a camera recorder is played back. .

In general, the iris assembly of the camera recorder is employed in a zoom lens unit or a compact type zoom unit of the camera recorder, and the amount of light incident through the zoom lens to an imaging device built into the camera recorder. It is used to control. The aperture assembly of the camera recorder includes a shutter constituting a passage through which light passes, a driving means for driving the shutter, and the like. The shutter is composed of two shutter plates having a predetermined shape, and by controlling relative positions between the shutter plates, the amount of light passing through the shutter can be controlled. The shutter plate can be moved along a predetermined trajectory by being guided by the guide member formed in the base member, and the movement of the driving means is transmitted to the shutter via the transmission means.

1 shows a schematic exploded perspective view of an aperture assembly of a camera recorder according to the prior art.

Referring to the drawings, the diaphragm assembly of the camera recorder includes a base 11, an upper shutter plate 13 and a lower shutter plate 13 ′ movably installed on the base 11, and the shutter plates 13 and 13. Drive motor for driving '). The cover 12 is coupled to the upper portion of the base 11 to protect the upper and lower shutter plates 13 and 13 ′ installed in the base 11. The light passage opening 12 is cut in the cover 12. The base 11 is integrally formed with bosses 11a, 11b, 11c and 11d for guiding the movement of the upper and lower shutter plates 13 and 13 '. The shutter plates 13 and 13 'are formed with circular and semi-circular cutouts as described later, and the area of the light passage opening formed by the arrangement of the shutters varies in size depending on the relative positions of the shutter plates. . Also described later in more detail, the shutters 13 and 13 ′ have grooves coupled to the bosses 11a, 11b, 11c and 11d formed in the base 11 and the pins 15a and 15b of the arm 15. Grooves are formed.

The arm 15 is rotatably provided inside the base 11. Fins 15a and 15b are formed at both ends of the arm 15, respectively, and these pins 15a and 15b are coupled to grooves formed in the shutter plates 13 and 13 ', respectively, as described above. A spring 14 is coupled to the axis of rotation of the arm 15. Both ends of the spring 14 are supported by the arm 15 and the support end 11e formed in the base, thereby providing a biasing force with respect to the arm 15.

The driving motor is coupled to the lower portion of the base 11. The drive motor is provided at the center of the motor cover 17, the cylindrical yoke 16, the bobbins 18a and 19a and coils 18b and 19b provided inside the yoke 16, and the yoke 16. The magnet 21 is included. The shaft 21a is formed in the magnet 21. One of the coils 18b corresponds to a drive coil for driving the shutter, and the other 19b corresponds to a braking coil for controlling the driving of the shutter.

2A and 2B show plan views of the upper and lower shutters.

Referring to FIG. 2A, a circular cutout 13a is formed at the center of the shutter plate 13, and a groove 13b to which the pin 15b of the arm 15 of FIG. 1 is coupled is formed. In addition, grooves 13c, 13d, and 13e to which the guides 11b, 11c, and 11d of FIG. 1 are respectively coupled are formed. Meanwhile, referring to FIG. 2B, a semi-circular cutout 13 ′ a is formed at an end of the shutter plate 13, and the groove 13 ′ b to which the pin 15 a of the arm 15 of FIG. 1 is coupled. ) Is formed. In addition, grooves 13'c, 13'd, and 13'e to which the guides 11a, 11b, and 11d of FIG. 1 are respectively coupled are formed.

3A and 3B are plan views illustrating the formation of light passages according to the relative positions of the shutter plates.

Referring to FIG. 3A, when the arm 15 rotates clockwise by driving the motor, the arm 15 pushes the lower shutter plate 13 'to the right and pulls the upper shutter plate 13 to the left. do. Therefore, the circular cutout 13a of the upper shutter plate 13 is closed by the lower shutter plate 13 ', and light cannot pass therethrough.

Referring to FIG. 3B, the arm 15 is rotated counterclockwise from FIG. 3A, thereby pulling the lower shutter plate 13 ′ to the left and simultaneously pushing the upper shutter plate 13 to the right. In this case, the circular cutout 13a of the upper shutter plate 13 coincides with the semicircular cutout 13'a of the lower shutter plate 13 'so that the beam passage opening 31 can be formed.

In the aperture of the camera recorder according to the prior art as described above, since the shutter plates 13 and 13 'are driven by the guides 11a, 11b, 11c, and 11d by the driving of the arm 15, the shutter plates 13, 13 ') tends to swing. That is, since the direction of the force applied to the shutter plates 13 and 13 'by the arm 15 always changes depending on the rotation angle position of the arm 15, the direction of movement of the shutter plates 13 and 13' The force applied in the other direction causes resistance to each of the guides 11a, 11b, 11c, and 11d, thereby causing the shutter plates 13, 13 'to cause rocking motion. The swinging motion of the shutter plate causes a change in the shutter aperture, which directly affects the amount of light passing through the light passage of the shutter. This momentary change in the shutter aperture acts as a cause of the sudden change in screen illuminance when playing back the camera recorder recording.

The present invention has been made to solve the above problems, it is an object of the present invention to provide an aperture assembly of the camera recorder that can improve the sudden change of the screen illumination.

It is another object of the present invention to provide an aperture assembly of a camera recorder in which unnecessary changes in shutter aperture can be prevented.

Another object of the present invention is to provide an aperture assembly of a camera recorder with an improved guide structure of a novel shutter plate.

1 is a schematic exploded perspective view of an aperture assembly of a camera recorder according to the prior art;

2A and 2B are plan views of the shutter plate of the aperture assembly shown in FIG.

3A and 3B are plan views showing a fully closed state and a fully open state of the shutter in the aperture assembly of FIG. 1, respectively.

4 is a schematic exploded perspective view of an aperture assembly of a camera recorder according to the present invention;

5A and 5B are plan views showing a fully closed state and a fully open state of the shutter in the aperture assembly of FIG. 4, respectively.

* Brief description of the main signs of the drawings

11. Base 12. Cover

13.13 '. Shutter Plate 14. Spring

15. Arm 16. York

18a.19a. Bobbin 18b.19b. coil

41. Base 42. Cover

43. First shutter plate 43 '. 2nd shutter plate

44.Spring 45.Arm

46. Yoke 47. Motor cover

In order to achieve the above object, according to the present invention, the base member; Drive means installed under the base member; First and second shutter plate members embedded in the base member to form a variable light passage hole; An aperture assembly of a camera recorder comprising: transmission means for transmitting a driving force of the driving means to the first and second shutter plate members.

At least one boss is formed inside the sidewall of the base member to guide the first and second shutter plate members.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings.

4 is a schematic exploded perspective view of a camera recorder aperture assembly according to the present invention.

Referring to the drawings, the basic configuration of the camera recorder aperture assembly according to the present invention is similar to that shown in FIG. That is, the camera recorder assembly of the present invention, as described with reference to Figure 1, the base 41, the motor cover 47 and the cylindrical yoke 46 provided below the base member 41, and the cylindrical Bobbins and coils 48a, 48b, 49a, and 49b provided inside the yoke 46 and a magnet 51 are provided. The cover 42 is installed on the base 41. In addition, an arm 45 formed with pins 45a and 45b is installed at one side of the base 41, and one end of the spring 44 is elastically supported with respect to the arm 45. The magnet 51 may rotate by the electromagnetic force generated by the bobbin and the coils 48a, 48b, 49a, and 49b, and the arm 45 coupled to the shaft 51a of the magnet 51 may rotate. have. The first shutter plate 43 and the second shutter plate 43 'are rotatably installed in the base 41, and the arm 45 can apply rotational force to the shutter plates 43 and 43'. This is installed.

According to a feature of the invention, the first shutter plate 43 has a circular cutout formed in the center and a groove 43a into which the pin 45b of the arm 45 can be inserted, formed at one side thereof. On the other hand, the second shutter plate 43 'has a semicircular cutout formed on one side and a groove 43'a which can be inserted into the pin 45a of the arm 45 formed on the other side. The position of the first plate 43 and the second plate 43 ′ may change continuously between the fully closed state and the fully open state of the aperture formed by the rotation of the arm 45.

A boss 41a is formed in the base 41 so as to guide the closing and opening movements of the shutter plates 43 and 43 '. It is preferable that at least one boss 41a is formed on the inner side surface of the side wall forming the base 41 and is in contact with the side surfaces of the shutter plates 43 and 43 '. The size and number of the bosses 41a should be limited to minimize the friction on the shutter plates 43 and 43 '. The number of bosses 41a formed on one side wall of the base 41 is preferably two, as shown in the figure.

5A and 5B are plan views showing the formation of light passages according to the relative positions of the shutter plates of the present invention.

Referring to the drawings, this is basically similar to that shown in FIGS. 3A and 3B. That is, the state of FIG. 5A in which the arm 45 pulls the first shutter plate 43 in the left direction and pushes the second shutter plate 43 'in the right direction corresponds to the fully closed state of the aperture, and vice versa. 5B, which is a case, corresponds to a fully closed state of the iris. At this time, each shutter plate 43, 43 'is guided by a board 41a in contact with its side.

Since the assembly of the camera recorder stop according to the present invention guides the shutter plate member along the boss formed inside the side wall of the base member, there is no rocking motion when the shutter plate is moved, and thus stable control of the shutter plate aperture is possible. Therefore, the sudden change in illuminance when playing back the image captured by the camera recorder can be prevented. In addition, since the width of the shutter plate can be reduced, the diaphragm assembly can be reduced in weight, and the life of the mold for manufacturing the shutter plate can be improved.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (1)

A base member; Drive means installed under the base member; First and second shutter plate members embedded in the base member to form a variable light passage hole; An aperture assembly of a camera recorder comprising: transmission means for transmitting a driving force of the driving means to the first and second shutter plate members. At least one boss is formed inside the sidewall of the base member to guide the first and second shutter plate members.