KR102319688B1 - Light amount adjusting device - Google Patents

Abstract

The light quantity control device is connected to a case having a through hole, one link rotatable with respect to the case, a driving unit for rotating the first link, and one end and the other end of the first link, and is connected to the case to move linearly. A second link connected to any one of the arranged first straight blade and the second straight blade, the first straight blade and the second straight blade, and rotatable with respect to the case, and a position for closing the through hole and a position for opening the through hole A first rotary blade rotatably coupled to the case to rotate between and connected to the first link, and rotatably coupled to the case to rotate between a position for closing the through hole and a position for opening the through hole and connected to the second link A second rotary blade is provided.

Description

Light amount adjusting device

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

A photographing device such as a digital camera, a video camera, and a CCTV has an image sensor that receives light from a subject and converts it into an electrical signal, and a light quantity control device such as an iris that can change the size of a hole through which the light passes through the image sensor.

In a photographing device such as a surveillance camera, a light quantity control device is used to block the path of light to adjust the light quantity and sensitivity. If the depth of field is adjusted by changing the area opened by the light quantity control device, a subject at a far or near distance can be clearly photographed.

Korean Patent Laid-Open Publication No. 1993-0000979 discloses a configuration of a conventional light quantity control device. In such a conventional light quantity control device, when adjusting the size of a hole through which light passes, the shape of the hole changes irregularly, so that the amount of light is disproportionately changed, diffraction phenomenon or chromatic aberration occurs asymmetrically with respect to the image sensor, Light cracking or blurring may occur. In particular, in the process of maximally tightening the aperture of the diaphragm, the shape of the aperture becomes almost rhombic, and the image may be blurred due to out of focus. In addition, for example, when shooting a scene including a high-brightness subject, such as light flowing through leaves, the light part is blurred in a rhombic shape resembling the aperture shape of the diaphragm, so that an unnatural image is taken.

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

A conventional light quantity control device as shown in FIG. 19 has a mechanism using wings 520 and 530 having holes 521 and 531 to close or open a light through hole 511 for passing light.

The light through hole 511 for transmitting the light to the photographing device is designed to form a circle as a whole, but the hole formed by the wings 520 and 530 of the light amount adjusting device while the light amount adjusting device is operating is the light through hole 511 ) does not match the shape of the light, so light may break or spread. That is, according to the conventional apparatus for adjusting the amount of light, there is a problem in that the image is partially out of focus. In addition, since the through hole of the light quantity control device is formed in a rhombus shape with a longer horizontal portion, optical aberrations in the vertical and horizontal directions are different. The image quality may be degraded.

There have been attempts to transform the shape of the aperture into a polygonal shape close to a circle in the light intensity control device having such a structure. It is difficult to manufacture in a small size. For example, in the case of designing a light quantity control device having a hexagonal opening using 6 blades, the size of the driving motor increases to drive the 6 blades, and the number of parts and the overall volume of the light quantity control device increase. .

Japanese Patent Laid-Open No. 1998-301159 and Japanese Patent No. 5173979 disclose a configuration of a light quantity control device using three or more blades moving linearly. According to this configuration, the distance the blades must travel from the maximum open position to the closed position increases. In order to increase the movement amount of the wing, the length of the rotary link driving the wing is increased, so that the size of the light quantity control device in the width direction and the length direction is increased, so it is difficult to downsize the light quantity control device.

Japanese Patent Registration No. 4735997 discloses a configuration of a light quantity control device using a total of six blades, including two linearly moving blades and four rotating blades. According to this configuration, it is possible to implement a light quantity control device that maintains the shape of the hexagonal through hole. However, since the disk member connected by the six blades and the pin must be arranged to drive all the six blades, 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 caused by the contact between the disk member and the six blades, a large driving motor and a reducer must be used.

A conventional light quantity control device having a polygonal opening having the above-described configuration has a large volume and an increase in manufacturing cost due to an increase in the number of parts, so it is difficult to employ in devices such as a surveillance camera or a camcorder.

Korean Patent Publication No. 1993-0000979 (Jan. 16, 1993) Japanese Laid-Open Patent Publication No. 1998-301159 (January 13, 1998) Japanese Patent Registration No. 5173979 (2013.01.11.) Japanese Patent Registration No. 4735997 (2011.05.13)

An object of the embodiments is to provide an apparatus for adjusting the amount of light having improved optical performance.

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

Another object of the embodiments is to provide a light quantity adjusting device capable of maintaining the same shape of an opening through which light passes while minimizing an increase in the number and volume of required parts.

Light quantity control device according to an embodiment, a case having a through hole through which light passes, a first link rotatably disposed with respect to the case, and a first link connected to the first link to generate a driving force for rotating the first link and a first straight blade connected to each of the one end and the other end of the first link and disposed in the case to be movable linearly between a position for closing at least a portion of the through hole of the case and a position for opening the through hole And a second straight blade, a second link connected to any one of the first straight blade and the second straight blade and rotatably disposed with respect to the case, and a position for closing a portion of the through hole of the case and a position for opening the through hole It is rotatably coupled to the case so as to rotate between the first rotary blade connected to the first link, and rotatably coupled to the case to rotate between a position for closing a portion of the through hole of the case and a position for opening the through hole, and a second rotary blade connected to the second link.

The light quantity control device may further include a linear guide installed between the case and the first straight blade and between the case and the second straight blade to guide the linear movement of the first straight blade and the second straight blade, 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 that protrudes from the case and is inserted into the straight groove.

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

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

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

The second link may include a third connecting protrusion, and any 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 may rotate in opposite directions with respect to each other.

The case may have 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 may rotate in opposite directions with respect to each other.

The first link may further include a fourth connecting protrusion protruding between the center of rotation of the first link and one end or between the center of rotation of the first link and the other end of the first link, and the first rotating blade has a fourth connecting protrusion. Is inserted and may be provided with a first rotation guide hole to extend by being curved, the second rotary blade may be provided with a second rotation guide hole extending through the third connecting projection is inserted into the curved.

The light quantity control device has an outer through hole corresponding to the through hole and further includes a cover coupled to the case so as to cover the first straight blade, the second straight blade, the first rotary blade, the second rotary blade, and the first link and the second link. can be provided

In the light quantity control device according to the embodiments as described above, the size of the through hole through which light passes by the first straight blade and the second straight blade and the first rotary blade and the second rotary blade for linear motion. The optical performance is improved as the shape of the aperture remains the same, a hexagonal shape close to a circle during adjustment.

In addition, since the first and second rotary blades and the four blades of the first straight blade and the second straight blade can be efficiently driven using the first link and the second link, the driving force required for the driving unit is minimized and The size of the space required for the arrangement and operation of the four blades can be minimized, making it possible to implement a compact light quantity control device.

1 is an exploded perspective view schematically illustrating a coupling relationship between components of a light quantity control device according to an embodiment.
FIG. 2 is a perspective view illustrating the bottom of the light amount adjusting device of FIG. 1 in an assembled state.
FIG. 3 is a perspective view illustrating an upper surface of the light amount adjusting device of FIG. 2 .
FIG. 4 is a top view illustrating an operating state of a portion of the inner side of the light quantity control device of FIG. 2 .
FIG. 5 is a top view showing another operating state of a portion of the inner side of the light amount adjusting device of FIG. 4 .
FIG. 6 is a top view showing another operating state of a portion of the inner side of the light amount adjusting device of FIG. 4 .
7 is a top view showing the operating state of the first straight blade and the second straight blade inside the light quantity control device of FIG.
FIG. 8 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7 .
FIG. 9 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7 .
Figure 10 is a top view showing the operating state of the first rotary blade and the second rotary blade inside the light quantity control device of Figure 2;
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 .
13 is a top view showing the operating state of the first straight blade and the second straight blade and the first rotary blade and the second rotary blade inside the light quantity control device of 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 the through hole of the light amount adjusting device of FIG. 15 is reduced.
17 is a top view illustrating a state in which the through hole is further reduced in the light amount adjusting device of FIG. 16 .
18 is a top view illustrating a state in which the through hole is closed in the light amount adjusting device of FIG. 17 .
19 is a conceptual diagram illustrating a conventional light amount adjusting device.

Hereinafter, the configuration and operation of the light quantity adjusting device according to the embodiments will be described in detail through the embodiments of the accompanying drawings. The expression 'and/or' used in the description means one or a combination of related elements.

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

The light quantity 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 in the case 10, and a first A driving unit 30 connected to the link 20 and generating a driving force for rotating the first link 20 , and disposed to move linearly in the case 10 , the first straight line connected to the first link 20 . The wing 40 and the second straight wing 50 , the second link 60 connected to the second straight wing 50 and rotatably disposed on the case 10 , and rotatably on the case 10 . It is provided with a first rotary blade 70 and a second rotary blade 80 that are coupled to rotate to open or close the through hole (11).

The apparatus for adjusting the amount of light having the above structure may be used in various types of photographing apparatuses, such as, for example, a digital still camera photographing a still image, a digital video camera photographing a moving image, or a surveillance camera such as a CCTV.

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

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 A link 60 is received.

A cover 90 may be coupled to the 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 a metal plate.

The first straight blade 40 and the second straight blade 50 are supported by the case 10 , and are arranged to move linearly with respect to the case 10 . The first straight blade 40 and the second straight blade 50 may move linearly along the X-axis direction. The first straight blade 40 and the second straight blade 50 are movable in a direction transverse to the path of light passing through the through hole 11 and move in opposite directions with respect to each other. The first straight blade 40 and the second straight blade 50 move linearly in the direction of opening the through hole 11 of the case 10 , that is, in a direction away from each other, or the through hole 11 of the case 10 . ) is disposed in the case 10 to move linearly in the closing direction, that is, in a direction closer to each other.

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

The first straight blade 40 and the second straight blade 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, each of the first straight wing 40 and the second straight wing 50 is a linear A straight guide is installed to guide the movement.

In the embodiment shown in FIG. 1, the straight guide is formed on each of the straight guide protrusion 10a formed on the inside of the case 10, the first straight blade 40 and the second straight blade 50, and the straight guide protrusion It has straight grooves (47, 48, 57, 58) into which the (10a) is inserted. However, the embodiment is not limited by the configuration of the straight guide shown in FIG. 1 , for example, a straight groove is installed in the case 10 , and the first straight wing 40 and the second straight wing 50 . It is also possible to install a protrusion. Or, for example, a straight guide may be implemented by forming a groove into which the ends of both edges of the first straight wing 40 and the second straight wing 50 are inserted on both sides of the inner side of the case 10 .

Since the straight guide protrusion 10a of the case 10 is inserted into the straight grooves 47, 48, 57, 58 of the first straight wing 40 and the second straight wing 50, the first straight wing 40 And the second straight blade 50 is limited in movement in the Y-axis direction in Fig. 1 can be moved only linearly along the X-axis direction. The case 10 is provided with a straight protrusion 10b for guiding the linear movement of the first straight blade 40 in contact with one surface of the first straight blade 40. The straight protrusion 10b functions to minimize resistance due to friction between the case 10 and the first straight blade 40 .

The first link 20 is rotatably disposed on 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 connecting protrusion 22 protruding upward in the Z-axis direction from one end 20a and a second connecting protrusion 22 protruding upward in the Z-axis direction at the other end 20b ( 23) is provided. The first straight blade 40 has a first connection hole 41 into which the first connection protrusion 22 is inserted, and the second straight blade 50 has a second connection into which the second connection projection 23 is inserted. A hole 51 is provided. The first connection hole 41 and the second connection hole 51 extend in the direction of the linear motion of the first straight blade 40 and the second straight blade 50, that is, in the Y-axis direction transverse to the X-axis direction. .

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

FIG. 2 is a perspective view illustrating the bottom of the light amount adjusting device of FIG. 1 in an assembled state.

The driving unit 30 is disposed outside the case 10 . The driving unit 30 may rotate the first link 20 of FIG. 1 by generating a driving force as 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 inside the case 10 , and the driving shaft 31 is rotatable with respect to the case 10 . The first link 20 includes a coupling hole 21 coupled to the driving shaft 31 between one end 20a and the other end 20b. As the coupling hole 21 of the first link 20 is coupled to the drive shaft 31 , the first link 20 may rotate with respect to the case 10 together with the drive shaft 31 .

The upper end of the drive shaft 31 is inserted into the connection hole 61 of 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. The second straight wing 50 connected to the second link 60 has a third connecting hole 52 into which the third connecting protrusion 62 is inserted.

Embodiments are not limited by the connection structure of the second link 60 and the second straight wing 50 as described above, for example, a connection hole is installed in the second link 60 and the second straight wing By installing a third connecting protrusion on the 50, the second link 60 and the second straight blade 50 can be connected.

The third connection hole 52 of the second straight blade 50 extends in the Y-axis direction, which is a direction transverse to the linear movement direction of the second straight blade 50 , that is, 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 transmit the rotational force of the first link 20 transmitted to the second straight wing 50 . It performs a function of transmitting back to the second link (60). That is, since the second straight wing 50 moves linearly with respect to the case 10 in a state connected to the first link 20, the second straight wing 50 moves linearly while the second straight wing 50. The force for moving the second straight blade 50 is transmitted to the second link 60 through the third connection protrusion 62 connected to the third connection hole 52 of the blade 50 .

According to the connection structure of the first link 20 and the second link 60 and the second straight blade 50 as described above, the first link 20 and the second link 60 are opposite to each other. direction can be rotated. For example, if the first link 20 in FIG. 1 rotates clockwise, the second straight blade 50 will move in a direction toward the center of the through hole 11 of the case 10, and the second straight blade 50 ) connected to the second link 60 rotates counterclockwise. Conversely, if the first link 20 rotates counterclockwise, the second straight blade 50 will move in a direction toward the outside of the through hole 11 of the case 10, and the second straight blade 50 is connected to the second straight blade 50. 2 Link 60 rotates clockwise.

Each of the rotation holes 72 and 82 of the first rotation blade 70 and the second rotation 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 with respect to 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.

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 along the circumferential direction around the rotation hole 82 of the second rotation blade 80 and extends.

The first link 20 includes a fourth connecting protrusion 24 between the rotation center 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 along the circumferential direction around the rotation hole 72 of the first rotation blade 70 and extends.

By inserting the fourth connecting protrusion 24 into the first rotation guide hole 71 of the first rotary blade 70 , the first rotary 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 , and thus interlocks with the rotational motion of the first link 20 . Thus, the first rotary blade 70 rotates.

By inserting the third connecting protrusion 62 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 it interlocks with the rotational motion of the second link 60 . Thus, the second rotary blade 80 rotates.

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 opposite directions.

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

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

The cover 90 includes a shaft coupling hole 99 to which an end of the rotation support shaft 19 is coupled, and ends of the first connecting protrusion 22 and the second connecting protrusion 23 are inserted into the first link 20 . It extends along the circumferential direction with respect to the rotation center of the first connecting protrusion 22 and the second connecting protrusion 23 is provided with outer rotation grooves (95, 92) for guiding the rotational movement.

The cover 90 is also inserted with the ends of the third connecting protrusion 62 and the fourth connecting protrusion 24, and extends along the circumferential direction with respect to the center of rotation of the first link 20 and the second link 60, and inner rotation grooves 94 and 93 for guiding the rotational movement of the third connecting protrusion 62 and the fourth connecting protrusion 24 .

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, the first straight blade 40 and the second straight forward It has straight rails 97 and 96 for guiding the linear motion of the blades 50 .

Between the case 10 and the cover 90, the first straight blade 40, the second straight blade 50, the first rotary blade 70, and the four blades of the second rotary blade 80 are disposed. When the four blades are arranged at different heights from each other in the space from the case 10 to the cover 90 . The first straight blade 40 and the second straight blade 50 and the first rotary blade 70 and the second rotary blade 80 are straight protrusions 10b and 10c and horizontal protrusions 10d of the case 10. and the straight rails 97 and 96 of the cover 90 (refer to FIG. 1), so the interference between the four blades, the interference between the four blades and the cover 90, and the four blades Mechanical interference between the poles and the case 10 may be minimized. Accordingly, the driving force required for the driving unit 30 to drive the four blades can be minimized.

4 is a top view showing an operating state of a portion of the inner side of the light quantity control device of FIG. 2, FIG. 5 is a top view showing another operating state of a part of the inner side of the light quantity control device of FIG. 4, FIG. It is a top view showing still another operating state of a part of the inner side of the light quantity adjusting device of FIG. 4 .

4, 5, and 6 each sequentially illustrates an operation in which the first link 20 of the light amount adjusting device rotates in a clockwise direction. 4 to 6 , while the first link 20 rotates clockwise, the second link 60 rotates counterclockwise opposite to the direction of movement of the first link 20 .

Figure 7 is a top view showing the operating state of the first straight blade and the second straight blade from the inside of the light quantity control device of FIG. Figure 7 is the first link 20 and the second link 60 of the light quantity control device when in the same state as shown in Figure 4, the position of the first straight blade 40 and the second straight blade 50 show

The second straight wing 50 is connected to the second connecting protrusion 23 of the first link 20 , and the first straight wing 40 is connected to the first connecting protrusion 22 of the first link 20 . Therefore, the rotational motion of the first link 20 is transmitted to the first straight blade 40 and the second straight blade 50 . Since the first straight blade 40 and the second straight blade 50 are regulated to move linearly only in the X-axis direction by the case 10, as the first link 20 rotates, the first straight blade (40) and the second straight blade 50 moves linearly in opposite directions with respect to each other along the X-axis direction. In Figure 7, the first straight blade 40 and the second straight blade 50 is moved in a direction away from each other, the through hole 11 is in a completely open state.

FIG. 8 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7 . 8 is the first link 20 and the second link 60 of the light quantity control device when in the same state as shown in FIG. 5, the position of the first straight blade 40 and the second straight blade 50 show

Compared with the state of FIG. 7, in FIG. 8, the first straight blade 40 and the second straight blade 50 close a part of the through hole 11 by moving in a direction toward each other toward the center of the through hole 11. do.

FIG. 9 is a top view illustrating another operating state of the light amount adjusting device of FIG. 7 . 9 is the first link 20 and the second link 60 of the light quantity control device when in the same state as shown in FIG. 6 the position of the first straight blade 40 and the second straight blade 50 show

Compared with the state of FIG. 8 , in FIG. 9 , the first straight blade 40 and the second straight blade 50 further close the through hole 11 by moving further in the direction toward each other toward the center of the through hole 11 . do.

Figure 10 is a top view showing the operating state of the first rotary blade and the second rotary blade inside the light quantity control device of Figure 2; 10 is the first link 20 and the second link 60 of the light quantity control device when in the same state as shown in FIG. 4 the position of the first rotary blade 70 and the second rotary blade 80 show

The third connecting protrusion 62 of the second link 60 is inserted into the second rotation guide hole 81 of the second rotation blade 80 , and the first rotation guide hole 71 of the first rotation blade 70 . ), the fourth connecting protrusion 24 of the first link 20 is inserted. Therefore, the respective rotational motions of the first link 20 and the second link 60 through the third connecting protrusion 62 and the fourth connecting protrusion 24, 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.

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

Compared with FIG. 10 , in FIG. 11 , the first rotary blade 70 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 slightly rotating toward the .

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

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

13 is a top view showing the operating state of the first straight blade, the second straight blade, the first rotary blade, and the second rotary blade inside the light quantity control device of FIG. It is a top view showing another operating state of the device, FIG. 15 is a top view showing another operating state of the light quantity control device of FIG. 13, and FIG. 16 shows a state in which the through hole of the light quantity control device of FIG. 15 is reduced It is a top view, and FIG. 17 is a top view showing a state in which the through hole is further reduced in the light amount adjusting device of FIG. 16 .

FIG. 13 corresponds to when the first link 20 and the second link 60 of the light quantity control device are in the same state as shown in FIG. 4 , FIG. 15 corresponds to the state shown in FIG. 5 , and FIG. corresponds to the state shown in FIG. 6 .

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

While the position of the first link 20 rotates 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 and Each position of the first straight wing 40 and the second straight wing 50 is sequentially changed to the same shape as shown in FIGS. 13 to 17 , and in the state shown in FIG. 6 , the first link 20 is If it is rotated further clockwise, the through hole 11 is in a closed state as shown in FIG. 18 .

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 be opened as shown in FIG. 17 . After the first link 20 is rotated counterclockwise from the state of FIG. 6 corresponding to the state shown in FIG. 17 and changed to the position shown in FIG. 5 , the first link 20 is further rotated counterclockwise When the position is changed to the position shown in Figure 4, each position of the first rotary blade 70 and the second rotary blade 80 and the first straight blade 40 and the second straight blade 50 of the light quantity control device is 17 to 16, 15, 14 and 13, respectively, the direction for opening the through hole 11 is changed in turn.

14 to 17, each position of the first rotary blade 70 and the second rotary blade 80 and the first straight blade 40 and the second straight blade 50 of the light quantity control device is 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 close to a circle.

In the hexagonal shape of the through hole 11 , the four sides of the left and right sides along the X-axis direction are formed by the first straight blade 40 and the second straight blade 50 . In addition, in the hexagonal shape of the through hole 11 , the upper and lower two sides along the Y-axis direction are formed by the first rotary blade 70 and the second rotary blade 80 . As described above, since the shape of the through hole 11 is maintained in the same hexagonal shape while the size of the through hole 11 is changed from the almost maximum open state to the minimum open state, the conventional light quantity implementing the rhombic through hole shape Since optical problems occurring in the control device can be avoided, the optical performance of the light quantity control device is improved.

In addition, according to the light quantity control device of the configuration as described above, the first rotary blade 70 and the second rotary blade 80 and the first straight blade 40 and the second straight blade 50 by driving the four blades While maintaining the size of the through hole 11 in a hexagonal shape, the first link 20 and the second link 60 can be used to efficiently drive the four blades, thereby minimizing the driving force required for the driving unit 30 In addition, the size of the space required for the arrangement and operation of the four blades can be minimized, making it possible to implement a compact light quantity control device.

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

10d: horizontal protrusion 52: third connection hole
10a: straight guide protrusion 59: second opening
10: case 60: second link
11: through hole 61: connection hole
19: rotation support shaft 62: third connecting projection
20a: one end 69: coupling cover
20: first link 70: first rotary blade
10b, 10c: straight protrusion 71: first rotation guide hole
20b: the other end 72: rotation hole
21: coupling hole 80: second rotary blade
22: first connecting projection 81: second rotation guide hole
23: second connecting projection 82: rotation hole
24: fourth connecting protrusion 90: cover
30: drive unit 99: shaft coupling hole
31: drive shaft 72, 82: rotation hole
40: first straight blade 94, 93: inner rotation groove portion
41: first connection hole 95, 92: outer rotation groove portion
49: first opening 97, 96: straight rail
50: second straight wing 47, 48, 57, 58: straight groove
51: second connection hole

Claims (10)

a case having a through hole through which light passes;
a first link rotatably disposed with respect 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 and disposed in the case to be linearly movable between a position for closing at least a portion of the through hole of the case and a position for opening the through hole a straight wing and a second straight wing;
a second link connected to any one of the first straight wing and the second straight wing 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 for closing a portion of the through hole of the case and a position for opening the through hole; and
A second rotary blade rotatably coupled to the case and connected to the second link to rotate between a position for closing a portion of the through hole of the case and a position for opening the through hole; and
The drive unit has a drive shaft rotatable with respect to the case, the first link is coupled to the drive shaft so that the first link rotates together with the drive shaft, and the second link is freely rotatable with respect to the drive shaft , the light intensity control device. According to claim 1,
Further comprising a linear guide installed between the case and the first straight blade and between the case and the second straight blade to guide the linear movement of the first straight blade and the second straight blade, the The first straight wing and the second straight wing move in opposite directions with respect to each other, light quantity control device. 3. The method of claim 2,
The linear guide includes a straight groove formed in each of the first straight wing and the second straight wing, and a straight guide protrusion protruding from the case and inserted into the straight groove. According to claim 1,
Each of the first straight blade and the second straight blade has an opening through which light passes through the through hole of the case, the light amount adjusting device. According to claim 1,
The first link includes a first connecting protrusion protruding from the one end and a second connecting protrusion protruding from the other end, and the first straight wing has a first connecting hole into which the first connecting protrusion is inserted. , The second straight blade is provided with a second connection hole into which the second connection projection is inserted, a light quantity control device. delete According to claim 1,
The second link has a third connecting protrusion, and any one of the first straight wing and the second straight wing connected to the second link further includes a third connecting hole through which the third connecting protrusion is inserted. and, the first link and the second link rotate in opposite directions with respect to each other. 8. The method of claim 7,
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 rotate in opposite directions with respect to each other, light quantity control device . 9. The method of claim 8,
The first link further includes a fourth connecting protrusion protruding 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 of the first link, the first rotary blade The fourth connecting protrusion is inserted and provided with a first rotation guide hole extending by being curved, and the second rotary blade is provided with a second rotation guide hole extending by being curved into which the third connecting protrusion is inserted, the amount of light regulating device. 10. The method of claim 9,
A cover having an outer through hole corresponding to the through hole and coupled to the case so as to cover the first straight blade, the second straight blade, the first rotary blade, the second rotary blade, and the first link and the second link Further comprising a, light intensity control device.

Images