WO2016122089A1

WO2016122089A1 - Light amount adjustment device

Info

Publication number: WO2016122089A1
Application number: PCT/KR2015/011822
Authority: WO
Inventors: 마사에미야카와
Original assignee: 한화테크윈 (주)
Priority date: 2015-01-28
Filing date: 2015-11-05
Publication date: 2016-08-04
Also published as: JP2016139136A; KR20160092759A; JP6647051B2; KR102319688B1

Abstract

A light amount adjustment device comprises: a case which has a hole; a first link which is rotatable with respect to the case; a driving part which rotates the first link; a first straight wing and a second straight wing which are respectively connected to one side end and the other side end of the first link, and are arranged in the case to be rectilinearly movable; a second link which is connected to any one of the first straight wing and the second straight wing, and is rotatable with respect to the case; a first rotary wing which is rotatably coupled to the case so as to rotate between a position which closes the hole and a position which opens the hole, and is connected to the first link; and a second rotary wing which is rotatably coupled to the case so as to rotate between the position which closes the hole and the position which opens the hole, and is connected to the second link.

Description

Light control device

Embodiments relate to a light amount control device, and more particularly, when adjusting the size of a hole through which light passes, the optical performance is improved by maintaining the shape of the hole in a hexagonal shape close to a circle, and the light amount control having a compact structure. Relates to a device.

Photographing devices such as digital cameras, video cameras, and CCTVs have an image sensor that receives light from a subject and converts the light into an electrical signal, and a light amount adjusting device such as an aperture that can change the size of a hole passing through the light to the image sensor.

Photographic devices such as surveillance cameras are also used to adjust the amount of light and sensitivity by blocking the path of light. By adjusting the depth by changing the area opened by the light amount adjusting device, it is possible to clearly capture a distant or close object.

Korean Unexamined Patent Publication No. 193-0000979 discloses a configuration of a conventional light quantity adjusting device. In the conventional light amount adjusting device, since the shape of the hole changes irregularly when adjusting the size of the hole passing through the light, the amount of light varies asymmetrically, or the diffraction phenomenon or chromatic aberration occurs asymmetrically with respect to the image sensor, Light splitting or smearing can occur. In particular, in the process of tightening the aperture of the aperture to the maximum, the shape of the aperture becomes almost rhombic, and thus the image may be blurred because it is out of focus. In addition, for example, when photographing a scene including a high-luminance subject, such as light flowing between leaves, the light portion is blurred to a rhombic shape similar to the aperture shape of the aperture, thereby taking an unnatural image.

19 is a conceptual diagram illustrating a conventional light amount adjusting device.

A conventional light quantity control device such as that shown in FIG. 19 has a mechanism that utilizes

wings

520 and 530 having

holes

521 and 531 to close or open the light aperture 511 for passing light.

The light through hole 511 for transmitting light to the photographing apparatus is designed to form a circle as a whole, but the hole formed by the

wings

520 and 530 of the light adjusting device is operated by the light through hole 511 while the light adjusting device is in operation. ) Does not match the shape of the light may split or bleed light. That is, according to the conventional light amount adjusting device, a problem occurs that the focus is partially blurred in the image. In addition, since the aperture of the light control device is formed in the shape of a longer lozenge in the horizontal portion, the optical aberration in the longitudinal direction and the transverse direction is different, resulting in an unbalanced resolution in the longitudinal direction and the transverse direction of the photographed image and a difference in the amount of light. The image quality of the image may be degraded.

There is an attempt to modify the shape of the through-hole into a polygonal shape close to a circle in the light quantity control device of such a structure, but according to this attempt, the number of wings forming the through-hole must be increased and the amount of movement of the aperture blades increases, so that the light-adjusting device It is difficult to manufacture small. For example, when designing a light quantity control device having hexagonal openings using six wings, the size of the driving motor is increased and the number of parts and the overall volume of the light quantity controlling device are increased to drive the six wings. .

Japanese Laid-Open Patent Publication No. 1998-301159 and Japanese Patent Laid-Open No. 5173979 disclose the configuration of a light quantity adjusting device using three or more wings that move linearly. This configuration increases the distance that the wings must travel from the maximum open position to the closed position. In order to increase the amount of movement of the wing, the length of the rotary link driving the wing is increased, so that the width and length of the light amount adjusting device are increased, so that it is difficult to downsize the light amount adjusting device.

Japanese Patent No. 4735997 discloses a configuration of a light quantity control device using a total of six wings, including two wings moving linearly and four wings rotating. According to this configuration, it is possible to implement a light amount control device to maintain the shape of the hexagonal through-holes. However, in order to drive all six blades, the disk member connected by the six blades and the pins must be arranged, so the number of necessary parts increases and the overall size and thickness of the light quantity control device increase. In addition, since the torque required to drive the disk member and the six blades increases due to friction between the disk member and the six blades, a large drive motor and a reducer should be used.

The conventional light quantity adjusting device having a polygonal opening having the configuration as described above is difficult to adopt in a device such as a surveillance camera or a camcorder because its volume is increased and the manufacturing cost increases due to the increase in the number of parts.

An object of the embodiments is to provide a light amount control device with improved optical performance.

Another object of the embodiments is to eliminate optical abnormalities such as light splitting or bleeding due to a change in the through hole through which the light passes during operation of the light quantity control device.

Yet another object of the embodiments is to provide a light quantity control device in which the shape of an opening through which light passes can be maintained in the same shape of a hexagon close to a circle while minimizing the increase in the number and volume of necessary parts.

According to one embodiment, a light quantity adjusting device includes a case having a through hole through which light passes, a first link rotatably disposed with respect to the case, and a driving force connected to the first link to rotate the first link. A first straight wing disposed in the case so as to be linearly movable between a driving portion and a position at which at least a portion of the through hole of the case is closed and a position at which the through hole is opened, connected to each of one end portion and the other end portion of the first link. And a second straight wing, a second link connected to one of the first straight wing and the second straight wing and rotatably disposed with respect to the case, a position for closing a part of the through hole of the case, and a position for opening the through hole. A first rotatable blade rotatably coupled to the case so as to rotate between the first link and a position for closing a part of the through hole of the case and opening the through hole; Is rotatably coupled to the case to rotate between positions and has a second rotary vane coupled to the second link.

The light amount adjusting device may further include a straight guide installed between the case and the first straight wing and between the case and the second straight wing to guide linear movement of the first and second straight wings. The first straight wing and the second straight wing can move in opposite directions with respect to each other.

The straight guide may include a straight groove formed in each of the first straight blade and the second straight blade, and a straight guide protrusion protruding from the case and inserted into the straight groove.

Each of the first straight wing and the second straight wing may have an opening through which light passing through the through hole of the case passes.

The first link may include a first connecting protrusion protruding from one end and a second connecting protrusion protruding from the other end, and the first straight wing may include a first connecting hole into which the first connecting protrusion is inserted. The second straight wing may have a second connecting hole into which the second connecting protrusion is inserted.

The drive unit may include a drive shaft rotatable with respect to the case, the first link may be coupled to the drive shaft to rotate the first link together with the drive shaft, and the second link may be freely rotatable with respect to the drive shaft.

The second link may have a third connecting protrusion, and one of the first straight wing and the second straight wing connected to the second link may further include a third connecting hole into which the third connecting protrusion is inserted. The first link and the second link can rotate in opposite directions with respect to each other.

The case may include a rotation support shaft rotatably supporting the first rotary blade and the second rotary blade, and the first rotary blade and the second rotary blade may rotate in opposite directions with respect to each other.

The first link may further include a fourth connecting protrusion that protrudes between the center of rotation of the first link and one end portion or between the center of rotation of the first link and the other end portion, wherein the first rotary blade has a fourth connecting protrusion. It may have a first rotation guide hole is inserted and bent to extend, the second rotary blade may have a second rotation guide hole is inserted and bent to extend the third connecting projection.

The light amount adjusting device has an outer through hole corresponding to the through hole, and further includes a cover coupled to the case to cover the first straight wing, the second straight wing, the first rotary wing, the second rotary wing, the first link, and the second link. It can be provided.

The first link may further include a coupling hole to which the driving shaft is coupled, and a distance between the first connecting protrusion and the coupling hole and a distance between the second connecting protrusion and the coupling hole may be equal to each other.

Each of the first connecting hole and the second connecting hole may extend in a direction crossing the moving directions of the first straight blade and the second straight blade.

The distance from the third coupling protrusion to the rotation center of the second link may be smaller than the distance from the first coupling protrusion to the rotation center of the first link.

The third connection hole may extend in a direction crossing the moving directions of the first straight blade and the second straight blade.

Each of the first rotary blade and the second rotary blade may be provided with a receiving groove for receiving the straight guide projection when each of the first rotary blade and the second rotary blade in the open position.

The case may further include a straight protrusion protruding from the inside of the case to be in contact with one surface of the first straight blade or the second straight blade.

The cover further includes an outer rotary groove for inserting respective ends of the first connecting protrusion and the second connecting protrusion and extending along the circumferential direction with respect to the rotation center of the first link to guide the rotational movement of the first connecting protrusion and the second connecting protrusion. It can be provided.

The cover further includes an inner rotary groove for inserting each end of the third connecting protrusion and the fourth connecting protrusion to extend in the circumferential direction with respect to the rotation center of the first link to guide the rotational movement of the third connecting protrusion and the fourth connecting protrusion. It can be provided.

The light amount adjusting device may further include a cover coupled to the case, and the cover may include a straight rail inserted into a straight groove to guide linear movement of the first straight blade and the second straight blade.

The cover may further include a curved rail which is curved along the rotational direction of the first rotary blade and the second rotary blade and contacts the first rotary blade or the second rotary blade and guides the rotational movement of the first rotary blade and the second rotary blade. Can be.

In the light quantity adjusting device according to the embodiments as described above, the size of the through hole through which the light passes by the first rotary blade and the second rotary blade and the rotary motion with the first straight blade and the second straight blade that performs linear motion While adjusted, the shape of the aperture remains the same in a hexagonal shape close to the circle, improving optical performance.

In addition, the four blades of the first and second rotary blades, the first straight blade and the second straight blade can be efficiently driven using the first link and the second link, thereby minimizing the driving force necessary for the driving unit. The space required for the placement and operation of the four wings can be minimized, enabling a compact light control device.

1 is an exploded perspective view schematically illustrating a coupling relationship between components of a light quantity adjusting device according to an embodiment.

FIG. 2 is a perspective view illustrating a bottom surface of the light quantity adjusting device of FIG. 1 assembled; FIG.

3 is a perspective view illustrating an upper surface of the light amount adjusting device of FIG. 2.

4 is a top view illustrating an operating state of a portion of the inside of the light amount control device of FIG. 2.

FIG. 5 is a top view illustrating another operating state of a portion of the inner side of the light amount control device of FIG. 4.

FIG. 6 is a top view illustrating another operating state of a portion of the inside of the light amount adjusting device of FIG. 4.

FIG. 7 is a top view illustrating an operating state of the first straight blade and the second straight blade within the light amount control device of FIG. 2.

FIG. 8 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7.

9 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7.

FIG. 10 is a top view illustrating an operating state of the first rotary blade and the second rotary blade within the light amount control device of FIG. 2.

FIG. 11 is a top view illustrating another operating state of the light amount adjusting device of FIG. 10.

12 is a top view illustrating another operating state of the light amount adjusting device of FIG. 10.

FIG. 13 is a top view illustrating an operating state of the first straight blade, the second straight blade, the first rotary blade, and the second rotary blade together in the light amount control device of FIG. 2.

FIG. 14 is a top view illustrating another operating state of the light amount adjusting device of FIG. 13.

FIG. 15 is a top view illustrating another operating state of the light amount adjusting device of FIG. 13.

FIG. 16 is a top view illustrating a state in which a through hole of the light amount adjusting device of FIG. 15 is reduced.

17 is a top view illustrating a state in which a through hole is further reduced in the light amount adjusting device of FIG. 16.

FIG. 18 is a top view illustrating a state where the through hole is closed in the light amount adjusting device of FIG. 17.

Hereinafter, with reference to the embodiments of the accompanying drawings, the configuration and operation of the light amount control device according to the embodiments will be described in detail. The expression 'and / or' as used in the description refers to one or a combination of elements.

The light amount adjusting device according to the embodiment shown in FIG. 1 includes a case 10 having a through hole 11 through which light passes, a first link 20 rotatably disposed at the case 10, and a first one. A driving unit 30 connected to the link 20 and generating a driving force for rotating the first link 20 and a first straight line arranged to linearly move to the case 10 and connected to the first link 20. A second link 60 connected to the blade 40 and the second straight wing 50, the second straight wing 50, and rotatably disposed in the case 10, and rotatably in the case 10. It is coupled to the first rotary blade 70 and the second rotary blade 80 to rotate to open or close the through hole (11).

The light quantity adjusting device having the above-described structure can be used in various types of photographing apparatuses, such as a digital still camera photographing still images, a digital video camera photographing moving images, or a surveillance camera such as a CCTV.

The case 10 performs a function of passing light to the image sensor of the photographing apparatus through the through hole 11, and also the first straight wing 40, the second straight wing 50, the driving unit 30, and the first unit. It performs the function of supporting the link 20 and the other components such as the second link 60, the first rotary blade 70 and the second rotary blade (80). The case 10 may be made of a material such as plastic or a thin metal plate, for example.

Inside the case 10, the first straight blade 40 and the second straight blade 50, the first rotary blade 70 and the second rotary blade 80, the first link 20 and the second Link 60 is received.

The cover 90 may be coupled to an upper surface of the case 10. The cover 90 has an outer through hole 11 corresponding to the through hole 11 of the case 10. The case 10 may also be made of a material such as plastic or metal plate.

The first straight wing 40 and the second straight wing 50 are supported by the case 10 and arranged to move linearly with respect to the case 10. The first straight wing 40 and the second straight wing 50 may move linearly along the X-axis direction. The first straight wing 40 and the second straight wing 50 are movable in a direction crossing the path of the light passing through the through hole 11 and in a direction opposite to each other. The first straight wing 40 and the second straight wing 50 are linearly moved in a direction of opening the through holes 11 of the case 10, that is, away from each other, or through the holes 11 of the case 10. ) Is disposed in the case 10 so as to move linearly in a direction of closing the ie close to each other.

Each of the first straight wing 40 and the second straight wing 50 has a size corresponding to the through hole 11 so as to correspond to a part of the through hole 11, and has a first opening 49 and an arc shape. 2 opening part 59 is provided. The first straight wing 40 and the second straight wing 50 may be made of plastic or a thin metal plate material.

The first straight wing 40 and the second straight wing 50 may be manufactured to have a symmetrical shape with respect to each other. Between the case 10 and the first straight wing 40, and between the case 10 and the second straight wing 50, the linearity of the first straight wing 40 and the second straight wing 50 is linear. A straight guide is provided for guiding the phosphorus movement.

In the embodiment shown in FIG. 1, the straight guide is formed on each of the straight guide protrusion 10a and the first straight blade 40 and the second straight blade 50 formed inside the case 10, the straight guide protrusion The

linear grooves

47, 48, 57, 58 into which 10a is inserted are provided. However, the embodiment is not limited by the configuration of the straight guide shown in FIG. 1, for example, by installing a straight groove in the case 10, and in the first straight wing 40 and the second straight wing 50. It is also possible to install protrusions. Alternatively, for example, a straight guide may be implemented by forming grooves into which end portions of both edges of the first straight blade 40 and the second straight blade 50 are inserted at both edges of the inner side of the case 10.

Since the straight guide protrusions 10a of the case 10 are inserted into the

straight grooves

47, 48, 57, and 58 of the first straight wing 40 and the second straight wing 50, the first straight wing 40 is provided. And the second straight wing 50 is limited to the movement in the Y-axis direction in Figure 1 can only move linearly along the X-axis direction. The case 10 includes a straight protrusion 10b that contacts a surface of the first straight wing 40 to guide the linear movement of the first straight wing 40. The linear protrusion 10b has a function of minimizing resistance caused by friction between the first straight wing 40 and the case 10 and the first straight wing 40.

The first link 20 is rotatably disposed in the case 10. The first straight wing 40 is connected to one end 20a of the first link 20, and the second straight wing 50 is connected to the other end 20b of the first link 20.

The first link 20 has a first connection protrusion 22 protruding upward in the Y-axis direction from one end 20a and a second connection protrusion protruding upward in the Y-axis direction from the other end 20b ( 23). The first straight blade 40 has a first connection hole 41 into which the first connecting protrusion 22 is inserted, and the second straight wing 50 has a second connection into which the second connecting protrusion 23 is inserted. The hole 51 is provided. The first connection hole 41 and the second connection hole 51 extend in the direction of linear movement of the first straight blade 40 and the second straight blade 50, that is, in the Y axis direction across the X axis direction. .

In the embodiment, the first linking protrusion 22 and the second linking protrusion 23 and the first linking hole connecting the first link 20, the first straight wing 40, and the second straight wing 50, respectively. It is not limited by the arrangement structure of the 41 and the second connection holes 51. For example, the structure may be modified to install connection holes at both ends of the first link 20 and to install the connection protrusions at each of the first straight wing 40 and the second straight wing 50.

The driving unit 30 is disposed outside the case 10. The driver 30 may rotate the first link 20 of FIG. 1 by generating a driving force when an electric signal is applied from the outside.

Referring to FIG. 1, the driving shaft 31 of the driving unit 30 penetrates the case 10 and protrudes into the case 10, and the driving shaft 31 is rotatable with respect to the case 10. The first link 20 has a coupling hole 21 coupled to the drive shaft 31 between the one end 20a and the other end 20b. As the coupling hole 21 of the first link 20 is coupled to the driving shaft 31, the first link 20 may rotate with respect to the case 10 together with the driving shaft 31. The distance from the first connecting protrusion 22 to the coupling hole 21, that is, the distance from the first connecting protrusion 22 to the center of rotation of the first link 20, is equal to the coupling hole 21 in the second connecting protrusion 23. Is equal to the distance from the second connecting protrusion 23 to the center of rotation of the first link 20.

The upper end of the drive shaft 31 is inserted into the connection hole 61 at one end of the second link 60. The second link 60 is freely rotatably coupled to the drive shaft 31. The coupling cover 69 is coupled to the upper side of the connection hole 61 of the second link 60 so that the second link 60 is stably coupled to the drive shaft 31.

The second link 60 has a third connecting protrusion 62 protruding from the other end portion. The second straight wing 50 connected to the second link 60 has a third connection hole 52 into which the third connection protrusion 62 is inserted. The distance from the third coupling protrusion 62 to the rotation center of the second link 60 is smaller than the distance from the first coupling protrusion 22 to the rotation center of the first link 20.

Embodiments are not limited by the connection structure of the second link 60 and the second straight wing 50 as described above, for example, by installing a connection hole in the second link 60 and the second straight wing. The third linking protrusion may be installed at the 50 to connect the second link 60 and the second straight wing 50.

The third connection hole 52 of the second straight wing 50 extends in the Y-axis direction, which is a direction of linear movement of the second straight wing 50, that is, a direction crossing the X-axis direction. The third connecting hole 52 of the second straight wing 50 and the third connecting protrusion 62 of the second link 60 may transmit the rotational force of the first link 20 transmitted to the second straight wing 50. A function of transmitting back to the second link 60 is performed. That is, since the second straight wing 50 moves linearly with respect to the case 10 while being connected to the first link 20, the second straight wing 50 moves linearly while the second straight wing 50 moves linearly. The force for moving is transmitted to the second link 60 through the third connecting protrusion 62 connected to the third connecting hole 52 of the second straight wing 50.

According to the connection structure of the first link 20, the second link 60, and the second straight wing 50 as described above, the first link 20 and the second link 60 are opposite to each other. Direction can be rotated. For example, in FIG. 1, if the first link 20 rotates in the clockwise direction, the second straight wing 50 will move in the direction toward the center of the through hole 11 of the case 10, and the second straight wing 50 may be used. The second link 60 connected to) rotates counterclockwise. On the contrary, if the first link 20 rotates in the counterclockwise direction, the second straight blade 50 will move in the direction toward the outside of the through hole 11 of the case 10, and the second straight blade 50 may be connected to the second straight blade 50. The two links 60 rotate clockwise.

Each of the

rotating holes

72 and 82 of the first rotary blade 70 and the second rotary blade 80 is rotatably coupled to the rotation support shaft 19 formed in the case 10. Accordingly, the first rotary blade 70 and the second rotary blade 80 may rotate about the case 10 about the rotation support shaft 19. The first rotary blade 70 and the second rotary blade 80 may be made of plastic or a thin metal plate material. Each of the first rotary blade 70 and the second rotary blade 80 has

accommodation grooves

70a and 80a that can accommodate the straight guide protrusion 10a when in the open position of the through hole.

The second rotary blade 80 has a second rotation guide hole 81 into which the third connecting protrusion 62 of the second link 60 is inserted. The second rotation guide hole 81 is curved in the circumferential direction and extends around the rotation hole 82 of the second rotary blade 80.

The first link 20 has a fourth connecting protrusion 24 between the center of rotation of the first link 20 and the other end 20b. The first rotary blade 70 has a first rotation guide hole 71 into which the fourth connecting protrusion 24 of the first link 20 is inserted. The first rotation guide hole 71 is curved in the circumferential direction and extends around the rotation hole 72 of the first rotation blade 70.

As the fourth connecting protrusion 24 is inserted into the first rotating guide hole 71 of the first rotating blade 70, the first rotating blade 70 is connected to the first link 20. When the first link 20 rotates, the rotational force of the first link 20 is transmitted to the first rotation guide hole 71 through the fourth connecting protrusion 24, so that the first link 20 interlocks with the rotational movement of the first link 20. The first rotary blade 70 is rotated.

As the third connecting protrusion 62 is inserted into the second rotation guide hole 81 of the second rotary blade 80, the second rotary blade 80 is connected to the second link 60. When the second link 60 rotates, the rotational force of the second link 60 is transmitted to the second rotation guide hole 81 through the third connecting protrusion 62, so that the second link 60 interlocks with the rotational movement of the second link 60. To rotate the second rotary blade (80).

As described above, since the first link 20 and the second link 60 rotate in opposite directions to each other, the first rotary blade 70 connected to each of the first link 20 and the second link 60. And the second rotary blade 80 also rotates in directions opposite to each other.

When the first link 20 rotates in the clockwise direction, the first rotary blade 70 connected to the first link 20 also rotates in the clockwise direction of closing the through hole 11. Since the second link 60 rotates counterclockwise while the first link 20 rotates in the clockwise direction, the second rotary blade 80 connected to the second link 60 also closes the through hole 11. Rotate counterclockwise.

When the first link 20 rotates counterclockwise, the first rotary blade 70 also rotates counterclockwise to open the through hole 11. Since the second link 60 rotates in the clockwise direction while the first link 20 rotates in the counterclockwise direction, the second rotary blade 80 connected to the second link 60 also opens the through hole 11. Rotate clockwise.

The cover 90 has an axial coupling hole 99 to which the end of the rotation support shaft 19 is coupled, and end portions of the first connecting protrusion 22 and the second connecting protrusion 23 are inserted into the first link 20. And

outer rotation grooves

95 and 92 extending along the circumferential direction with respect to the rotation center thereof to guide the rotational movement of the first connecting protrusion 22 and the second connecting protrusion 23.

The cover 90 also has end portions of the third connecting protrusion 62 and the fourth connecting protrusion 24 inserted therein and extends along the circumferential direction with respect to the center of rotation of the first link 20 and the second link 60. Inner

rotating grooves

94 and 93 for guiding the rotational movement of the third connecting protrusion 62 and the fourth connecting protrusion 24 are provided.

The cover 90 is also inserted into a portion of the

straight grooves

47, 48, 57, 58 of the first straight blade 40 and the second straight blade 50, so that the first straight blade 40 and the second straight blade are straight.

Straight rails

97 and 96 are provided to guide the linear movement of the vanes 50. The cover 90 also has a curved rail 98 in contact with the first rotary blade 70 and the second rotary blade 80 for guiding the rotational movement. The curved rail 98 is curved along the rotational direction of the first rotary blade 70 and the second rotary blade 80.

Four blades of the first straight wing 40, the second straight wing 50, the first rotary wing 70 and the second rotary wing 80 are disposed between the case 10 and the cover 90. At that time, four wings are arranged at different heights in the space from the case 10 to the cover 90. The first straight blade 40, the second straight blade 50, the first rotary blade 70, and the second rotary blade 80 are

straight protrusions

10b and 10c and a horizontal protrusion 10d of the case 10. And between the

straight rails

97 and 96 of the cover 90 (see FIG. 1), the interference between the four wings, the interference between the four wings and the cover 90, and the four wings Mechanical interference between the fields and the case 10 can be minimized. Therefore, the driving unit 30 can minimize the driving force required to drive the four blades.

4 is a top view illustrating an operating state of a portion of the inside of the light amount control device of FIG. 2, FIG. 5 is a top view illustrating another operating state of a portion of the inside of the light amount control device of FIG. 4. 4 is a top view showing still another operating state of a portion of the inside of the light amount control device of FIG.

4, 5, and 6 respectively show the operation of rotating the first link 20 of the light amount adjusting device counterclockwise. 4 to 6, the second link 60 rotates in a counterclockwise direction opposite to the direction of movement of the first link 20 while the first link 20 rotates counterclockwise.

FIG. 7 is a top view illustrating an operating state of the first straight blade and the second straight blade within the light amount control device of FIG. 2. FIG. 7 shows the positions of the first straight blade 40 and the second straight blade 50 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 4. Illustrated.

The second straight wing 50 is connected to the second connecting projection 23 of the first link 20, the first straight wing 40 is connected to the first connecting projection 22 of the first link 20. Therefore, the rotational motion of the first link 20 is transmitted to the first straight wing 40 and the second straight wing 50. Since the first straight wing 40 and the second straight wing 50 are restricted to move linearly only along the X-axis direction by the case 10, the first straight wing 20 rotates as the first link 20 rotates. The 40 and the second straight blade 50 move linearly in directions opposite to each other along the X-axis direction. In FIG. 7, the first straight wing 40 and the second straight wing 50 move in a direction away from each other so that the through hole 11 is completely opened.

FIG. 8 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7. FIG. 8 shows the positions of the first straight wing 40 and the second straight wing 50 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 5. Illustrated.

In comparison with the state of FIG. 7, in FIG. 8, the first straight wing 40 and the second straight wing 50 move toward each other toward the center of the through hole 11 to close a part of the through hole 11. do.

9 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7. FIG. 9 shows the positions of the first straight wing 40 and the second straight wing 50 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 6. Illustrated.

In comparison with the state of FIG. 8, in FIG. 9, the first straight wing 40 and the second straight wing 50 move further toward each other toward the center of the through hole 11, thereby further closing the through hole 11. do.

FIG. 10 is a top view illustrating an operating state of the first rotary blade and the second rotary blade within the light amount control device of FIG. 2. FIG. 10 shows the positions of the first rotary blade 70 and the second rotary blade 80 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 4. Illustrated.

The third connecting protrusion 62 of the second link 60 is inserted into the second rotating guide hole 81 of the second rotating blade 80, and the first rotating guide hole 71 of the first rotating blade 70 is provided. ), The fourth connecting protrusion 24 of the first link 20 is inserted. Therefore, the rotational movement of each of the first link 20 and the second link 60 is performed through the third connecting protrusion 62 and the fourth connecting protrusion 24 through the first rotating blade 70 and the second rotating blade ( 80, the first rotary blade 70 and the second rotary blade 80 rotate in opposite directions to each other.

In FIG. 10, the first rotary blade 70 moves to the maximum in the counterclockwise direction, and the second rotary blade 80 moves to the maximum in the clockwise direction so that the through hole 11 is completely opened.

FIG. 11 is a top view illustrating another operating state of the light amount adjusting device of FIG. 10. FIG. 11 illustrates the positions of the first rotary blade 70 and the second rotary blade 80 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 5. Illustrated.

In comparison with FIG. 10, in FIG. 11, the first rotary blade 70 is rotated slightly toward the center of the through hole 11 in the clockwise direction, and the second rotary blade 80 is the center of the through hole 11 in the counterclockwise direction. A portion of the through hole 11 is closed by rotating slightly toward.

12 is a top view illustrating another operating state of the light amount adjusting device of FIG. 10. FIG. 12 illustrates the positions of the first rotary blade 70 and the second rotary blade 80 when the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 6. Illustrated.

Compared with FIG. 11, in FIG. 12, the first rotary blade 70 further rotates clockwise toward the center of the through hole 11, and the second rotary blade 80 rotates counterclockwise in the center of the through hole 11. By further rotating toward the portion of the through-hole 11 close to the central portion of the through-hole 11 is closed.

FIG. 13 is a top view illustrating an operating state of the first straight blade, the second straight blade, the first rotary blade, and the second rotary blade together in the light amount adjusting device of FIG. 2, and FIG. 15 is a top view showing another operating state of the device, FIG. 15 is a top view showing another operating state of the light amount adjusting device of FIG. 13, and FIG. 16 shows a reduced state of the aperture of the light amount adjusting device of FIG. FIG. 17 is a top view illustrating a state in which a through hole is further reduced in the light amount adjusting device of FIG. 16.

FIG. 13 corresponds to the state in which the first link 20 and the second link 60 of the light amount adjusting device are in the same state as shown in FIG. 4, and FIG. 15 corresponds to the state shown in FIG. 5, and FIG. 17. Corresponds to the state shown in FIG.

While the position of the first link 20 is rotated clockwise from the state shown in FIG. 4 to the state shown in FIG. 6, the first rotary blade 70 and the second rotary blade 80 of the light quantity control device The position of each of the first straight wing 40 and the second straight wing 50 is changed in order as shown in Figs. 13 to 17, and the first link 20 in the state shown in Fig. 6 is Further clockwise rotation results in a closed state of the through hole 11 as shown in FIG.

When the first link 20 starts to rotate counterclockwise in the state shown in FIG. 18, a portion corresponding to the center of the through hole 11 starts to open as shown in FIG. 17. From the state of FIG. 6 corresponding to the state shown in FIG. 17, after the first link 20 is rotated counterclockwise to the position shown in FIG. 5, the first link 20 is further rotated counterclockwise. By changing to the position shown in FIG. 4, the respective positions of the first rotary blade 70, the second rotary blade 80, the first straight blade 40, and the second straight blade 50 of the light amount control device are 17 to 16, 15, 14, and 13 are sequentially changed in the direction for opening the through-hole 11 as shown in each.

As shown in FIGS. 14 to 17, the respective positions of the first rotary blade 70, the second rotary blade 80, the first straight blade 40, and the second straight blade 50 of the light amount control device The shape of the through hole 11 that is changed while the size of the through hole 11 is changed is maintained in the same shape of approximately hexagonal shape close to the circle.

In the hexagonal shape of the through hole 11, four sides of the left and right sides along the X-axis direction are formed by the first straight wing 40 and the second straight wing 50. In addition, in the hexagonal shape of the through-hole 11, two sides of the upper side and the lower side along the Y-axis direction are formed by the first rotary blade 70 and the second rotary blade 80. As such, while the size of the through hole 11 is changed from a state in which the size of the through hole 11 is opened to the minimum open state, the shape of the through hole 11 is maintained in the same hexagonal shape. The optical performance of the light adjusting device can be improved by avoiding the optical problems caused by the adjusting device.

In addition, according to the light amount control device of the configuration described above by driving the four blades of the first rotary blade 70 and the second rotary blade 80, the first straight wing 40 and the second straight wing 50 by While maintaining the size of the through-hole 11 in a hexagonal shape, by using the first link 20 and the second link 60 can efficiently drive four blades to minimize the driving force required for the drive unit 30 In addition, it is possible to minimize the size of the space required for the arrangement and operation of the four wings, enabling the implementation of a compact light control device.

The configuration and effects of the above-described embodiments are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the invention should be defined by the appended claims.

Embodiments are applied to a light amount control device of a photographing device such as a digital camera, a video camera, a CCTV.

Claims

A case having a through hole through which light passes;

A first link rotatably disposed relative to the case;

A driving unit connected to the first link and generating a driving force for rotating the first link;

A first connected to each of the one end and the other end of the first link, the first link disposed in the case so as to be linearly movable between a position of closing at least a portion of the through hole of the case and a position of opening the through hole; Straight wing and second straight wing;

A second link connected to one of the first straight blade and the second straight blade and rotatably disposed with respect to the case;

A first rotary blade rotatably coupled to the case and connected to the first link to rotate between a position of closing a portion of the aperture of the case and a position of opening the aperture; And

And a second rotary wing rotatably coupled to the case and connected to the second link to rotate between a position of closing a portion of the through hole of the case and a position of opening the through hole.
The method of claim 1,

And a straight guide installed between the case and the first straight wing and between the case and the second straight wing to guide linear movement of the first and second straight wings. The first straight wing and the second straight wing, the light amount control device that moves in the opposite direction with respect to each other.
The method of claim 2,

The straight guide includes a straight groove formed in each of the first straight blade and the second straight blade, and a straight guide protrusion protruding from the case and inserted into the straight groove, light quantity adjusting device.
The method of claim 1,

Each of the first straight wing and the second straight wing has an opening for allowing light to pass through the through hole of the case, light quantity adjusting device.
The method of claim 1,

The first link has a first connection protrusion protruding from the one end and a second connection protrusion protruding from the other end, and the first straight wing has a first connection hole into which the first connection protrusion is inserted. And the second straight wing has a second connection hole into which the second connection protrusion is inserted.
The method of claim 5,

The drive unit includes a drive shaft rotatable with respect to the case, the first link is coupled to the drive shaft to rotate the first link together with the drive shaft, the second link is rotatably coupled to the drive shaft Light control device.
The method of claim 6,

The second link has a third connecting protrusion, and one of the first straight wing and the second straight wing connected to the second link further includes a third connecting hole into which the third connecting protrusion is inserted. And the first link and the second link rotate in opposite directions with respect to each other.
The method of claim 7, wherein

The case has a rotation support shaft for rotatably supporting the first rotary blade and the second rotary blade, the first rotary blade and the second rotary blade is rotated in the opposite direction with respect to each other, the light amount adjusting device .
The method of claim 8,

The first link further includes a fourth connecting protrusion that protrudes between the center of rotation of the first link and the one end or between the center of rotation of the first link and the other end, and the first rotary wing Has a first rotation guide hole in which the fourth connection protrusion is inserted and curved and extends, and the second rotation blade has a second rotation guide hole in which the third connection protrusion is inserted and curved and extending. Regulator.
The method of claim 9,

A cover having an outer through hole corresponding to the through hole and coupled to the case to cover the first straight blade, the second straight blade, the first rotary blade, the second rotary blade, the first link, and the second link. Further comprising a light amount adjusting device.
The method of claim 5,

The first link further includes a coupling hole to which the driving shaft is coupled, and a distance between the first connecting protrusion and the coupling hole and a distance between the second connecting protrusion and the coupling hole are equal to each other.
The method of claim 5,

Each of the first connection hole and the second connection hole extends in a direction crossing the moving directions of the first straight blade and the second straight blade.
The method of claim 7, wherein

And a distance from the third connecting protrusion to the rotation center of the second link is smaller than a distance from the first connecting protrusion to the rotation center of the first link.
The method of claim 13,

And the third connecting hole extends in a direction crossing the moving directions of the first straight blade and the second straight blade.
The method of claim 3,

Each of the first rotary blade and the second rotary blade has a receiving groove for receiving the straight guide projection when each of the first rotary blade and the second rotary blade in the open position, Light control device.
The method of claim 1,

The case further comprises a straight protrusion protruding from the inside of the case in contact with one surface of the first straight blade or the second straight blade, light quantity control device.
The method of claim 10,

The cover is inserted into each end of the first connecting projection and the second connecting projection and extends along the circumferential direction with respect to the rotation center of the first link to guide the rotational movement of the first connecting projection and the second connecting projection. The light amount adjusting device further comprises an outer rotating groove.
The method of claim 17,

The cover is inserted into each end of the third connecting projection and the fourth connecting projection to extend along the circumferential direction with respect to the rotation center of the first link to guide the rotational movement of the third connecting projection and the fourth connecting projection. Light amount adjusting device further comprising an inner rotating groove.
The method of claim 3,

And a cover coupled to the case, the cover having a straight rail inserted into the straight groove to guide linear movement of the first straight blade and the second straight blade.
The method of claim 19,

The cover is curved along the rotation direction of the first rotary blade and the second rotary blade and in contact with the first rotary blade or the second rotary blade and guides the rotational movement of the first rotary blade and the second rotary blade. A light amount adjusting device, further comprising a curved rail.