KR100775211B1 - Shutter device of a compact camera - Google Patents

Abstract

The present invention provides a compact camera shutter device, in particular, the amount of light flowing into the image sensor can be controlled by an electromagnetically driven shutter, so that the volume of the entire system can be significantly reduced compared to the mechanical shutter It relates to a shutter device of.

A shutter device of a micro camera according to the present invention includes a substrate on which a movable flow path is formed; One or more coils for generating electromagnetic forces; A moving body moved in the movable flow path by an electromagnetic force generated by the coil; And a blocking film having a through hole formed at a position corresponding to the center of one coil.

Camera, shutter, coil, substrate, moving object

Description

Shutter apparatus for micro cameras

1 is an exploded perspective view showing the structure of a micro camera.

2 is an exploded perspective view of the lens group assembly.

Figure 3 is a perspective view showing a shutter device of a micro camera according to an embodiment of the present invention.

Figure 4 is a rear perspective view of the present invention Figure 3;

5 is an exploded perspective view of FIG. 3.

6 is a plan view of FIG.

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

8 is a view showing a plurality of coils, flow paths, and moving bodies according to the present invention.

9 is a plan view for showing the operation of the shutter device of the compact camera according to the present invention.

10 is a cross-sectional view showing a light blocking state of the through hole in the shutter device according to the present invention.

11 is a cross-sectional view showing a light transmission state of the through hole in the shutter device according to the present invention.

12 is a flowchart illustrating a shutter control method of a compact camera according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110 ... block 111

120 Lower board 130 Central board

131 ... moving body Euro 135 ... moving body

140 Top board 141,142 Coil

145-148 ... Pad

The present invention provides a compact camera shutter device, in particular, the amount of light flowing into the image sensor can be controlled by an electromagnetically driven shutter, so that the volume of the entire system can be significantly reduced compared to the mechanical shutter It relates to a shutter device of.

Recently, with the development of communication technology and digital information processing technology, portable terminal technology in which various functions such as information processing and arithmetic, communication, image information input and output are integrated is emerging. Examples include PDAs or mobile phones equipped with digital cameras and communication functions, and mobile phones equipped with digital cameras and PDA functions. Due to the development of digital camera technology and information storage capabilities, high-end digital camera modules The mounting of is increasingly common. With the development of various technologies to support this, a mega pixel image sensor is used in a digital camera module mounted on a portable terminal, so that optical zoom and auto focus functions can be used. In addition, the importance of the mechanical shutter (mechanical shutter) and mechanical iris (mechanical iris) function is becoming more important.

As an operation method of an image sensor (eg, a CCD), two scan methods, interlaced scan and progressive scan, are used. The interlaced scanning method, which is used in the image sensor for video, scans an image twice in two scans. In case of two scans, the light is continuously turned on until a second scan is performed. This will cause a drop in image quality.

Therefore, in order to obtain a high quality image, the process of blocking light in two scanning processes using a mechanical shutter must be considered. On the other hand, the 350,000-pixel digital camera uses a progressive scan method that scans all pixels at once. In this case, there is no error due to time intervals, so the electronic shutter can be controlled without a mechanical shutter. Do.

In recent digital cameras with more than 3 million pixels, the interlaced scan method has been re-adopted to get more light from the same image sensor size and expect better image quality. In this case, as described above, the expected image quality cannot be obtained only by the electronic shutter. Therefore, a mechanical shutter is a trend, and technology development for this has been actively performed. The mechanical shutter is a function that blocks the unnecessary light and upgrades the image quality by one step when the picture is taken as if a person blinks.Smear is a vertical line formed on the screen when shooting strong reflected light such as a light or the sun. By blocking the phenomenon by hardware rather than software, you can get clearer picture quality.

1 is an exploded perspective view showing the structure of a general compact camera.

Referring to FIG. 1, a configuration includes a lens group assembly 10 including one or more lenses, a case 20, an image sensor 30, and a peripheral circuit board 40 including peripheral circuits.

The lens group assembly 10 includes one or more lenses therein and is assembled to the case 20. The image sensor 30 and the peripheral circuit board 40 are provided below the case 20. The image sensor 30 detects an electrical signal from an optical signal passing through the lens, and is composed of a CMOS or CCD image sensor.

However, with the recent use of megapixel image sensors in digital camera modules mounted on portable terminals, many lens group assemblies, optical zoom, and auto focus adjustments have been added to provide high quality image acquisition and additional convenience functions. The module which added the (auto focus control) function is employ | adopted. FIG. 2 is a configuration in which a plurality of optical systems 11 and 12 are disposed between the image sensor 30 and the lens group assembly 10 to perform optical zoom and autofocus functions.

In the smallest digital camera module, the volume occupied by the camera module occupies a relatively small volume relative to the size of the entire device, while satisfying performances such as fast startup speed, low power consumption, and large displacement. When a moving part such as a lens group is moved by a driver that performs a rotational motion such as a motor, the number of parts is complicated, its structure is complicated, and the volume is large due to the size of the motor.

In order to apply a mechanical shutter function to such a compact digital camera module, a driver that can occupy a relatively small volume and satisfy performance such as high starting speed, low power consumption, and large displacement is required.

In particular, there is a need for a driver that can cope with an increase in the required displacement as the size of the image increases. In the case of a conventional general magnetic actuator, a large number of parts are used, and thus there is a limitation in unit cost and size. There is a limit to increase.

In addition, in the case of moving the moving part by a drive that rotates such as a stepping motor (stepping motor), since the gear box is used in the power transmission process, the number of parts increases and the structure becomes complicated. In addition, the response speed is slow, and there are disadvantages such as friction and noise of the gear part. In addition, the mechanical shutter adopting such a method has a difficulty in manufacturing a low-cost driver due to a complicated structure, and there is a limitation in size in miniaturization.

In order to solve the above problems, the present invention is to provide a shutter device of a compact camera that can drive the shutter by using an electromagnetic force.

Another object of the present invention is a shutter device of an ultra-compact camera including one or more coils and a movable body made of an optical material such as a metal that is movable by electromagnetic force at a position opposite to the coils. In providing.

Still another object of the present invention is to provide a shutter device of a micro camera, which can implement a mechanical shutter function of a camera module optical system using a magnetic fluid and a coil.

Shutter device of the micro camera according to the present invention for achieving the above object,

A substrate on which a movable flow path is formed; One or more coils for generating electromagnetic forces; A moving body moved in the movable flow path by an electromagnetic force generated by the coil; And a blocking film having a through hole formed at a position corresponding to the center of one coil.

In detail, the upper or lower substrate is laminated on the substrate, and the coil or / and the blocking film is formed on the upper or lower substrate.

Preferably, the movable body includes a magnetic material that is operated by the electromagnetic force of the coil, and includes a material that blocks light corresponding to the wavelength region of the image sensor.

Preferably, the upper and lower substrates are stacked on the substrate up and down to seal the movable flow path.

Preferably, a plurality of coils are disposed on the upper or lower substrate, the coil center of any one of the plurality of coils is aligned with the through hole, and the movable body is moved to the center of the coil by a current applied to one of the coils. It is characterized by being moved along the movable flow path.

Preferably, the moving body is characterized in that the magnetic body or magnetic fluid.

On the other hand, the shutter device of the ultra-compact camera according to the present invention,

A substrate forming a flow path; A moving body moved to open and close an optical path inside the flow path; It is disposed along one side of the substrate and on the flow path, characterized in that it comprises one or more coils for moving the movable body.

On the other hand, the shutter device of the ultra-compact camera according to the present invention comprises: a first substrate having a moving body which forms a sealed flow path and moves in the flow path; A second substrate coupled to an upper surface of the first substrate and having a plurality of coils; A third substrate coupled to the bottom of the first substrate; A blocking film coupled to a bottom surface of the third substrate and having a through hole aligned with a center of one coil; A controller for applying a current to any one of the plurality of coils to move the movable body in the flow path to open and close the through hole; Characterized in that it comprises a.

Preferably, the portion in contact with the flow path of the first substrate is characterized in that the hydrophobic film is formed.

Hereinafter, with reference to the accompanying drawings as follows.

3 is a block diagram illustrating a shutter device of a micro camera according to the present invention.

Referring to FIG. 3, a lower substrate 120 having a blocking film 110 having a through hole formed therein for passing light therethrough, and a movable body (FIGS. 5 to 135) including a material such as a metal that is moved to open and close the through hole; ; A central substrate (130) having a flow path for receiving and moving the movable body and coupled to the lower substrate (120); The upper substrate 140 is provided with one or more driving coils 141 and 142 to move the movable part at full magnetic force.

The lower and upper substrates 120 and 140 are made of a transparent material.

Referring to the accompanying drawings, a shutter device of a micro camera according to an exemplary embodiment of the present invention configured as described above is as follows.

3 is a front perspective view of the shutter device of the micro camera according to the present invention, and FIG. 4 is a rear perspective view of FIG.

3 and 4, in the shutter structure, the lower substrate 120, the central substrate 130, and the upper substrate 140 are closely adhered to each other in order. The lower and upper substrates 120 and 140 are preferably made of a transparent material, and the lower substrate 120 is formed by attaching a blocking film 110 having a through hole 111 formed therein to suppress reflection on an optical path.

A plurality of coils 141 and 142 are wound and attached to the upper substrate 140 in a predetermined shape. The plurality of coils 141 and 142 may be wound in the same shape or in different shapes, and the coil shape may be wound in one of a shape of a circle, a square, an ellipse, a triangle, a polygon, and the like.

The inner region size of each coil wound on the upper substrate 140 may be larger than the size of the through hole 111 formed in the blocking film 110 shown in FIG. 4 or the moving body 135 shown in FIG. 5. Do. In addition, the coil of any one of the plurality of coils 141 and 142 is disposed so that its center coincides with the center of the through hole. The plurality of coils may be made of a fine pattern coil on a flexible substrate and attached to the upper substrate 140.

The direction in which the plurality of coils 141 and 142 are disposed is arranged in a direction for minimizing the size of the substrate, for example, in a diagonal direction. In addition, a part of two coils arranged in a diagonal direction, that is, the inner coils are disposed to overlap each other, thereby minimizing a space in which the coils are placed.

Power may be individually supplied through the pads 145-148 connected to the power connection lines 143 and 144 of the plurality of coils 141 and 142, respectively, and the current applied to the coils 141 and 142 through the pads 145 and 148, respectively. The direction and size can be adjusted. Here, the pads 145-148 may be provided on the substrate or may be provided outside the substrate.

5 is an exploded perspective view of FIG. 3. Referring to FIG. 5, a central substrate 130 is installed between the upper substrate 140 and the lower substrate 120. The central substrate 130 is formed of an opaque material, and a moving passage 131 having a predetermined size and shape is formed. Here, the size of the moving body flow path 131 is preferably at least two times or more than the size of the moving body 135 for the full opening and closing of the through hole 111 by the movement of the moving body 135, The shape is preferably a structure that does not interfere with the movement of the moving body (135). In addition, the direction in which the moving channel 131 is formed is an oblique direction connecting the centers of the two coils 141 and 142. When the coils 141 and 142 are disposed in a diagonal direction, the moving channel 131 is also formed in a diagonal direction. Do.

In other words, the outer shape of the moving body passage 131 is similar to the shape of the moving body 135. For example, when the moving body 135 is formed in an elliptical shape, the outside of the moving body flow path 131 may also be formed in an oval shape. When the moving body 135 is formed in a rectangular shape, the moving body flow path 131 may also be formed in a rectangular shape. have. In addition, the width of the movable passage 131 is equal to or larger than the width of the movable body 135, and the length of the movable passage 131 is equal to or larger than twice the length of the movable body 135. That is, the moving body flow path may be formed in a shape or size to minimize friction due to the movement of the moving body.

Here, the moving body 135 may select a material that blocks light corresponding to the wavelength region of the image sensor. Preferably, the movable body 135 is a material which can move along the movable passage 131 by a magnetic field, and may be made of a metal material or another magnetic body or magnetic fluid.

For example, when the moving body 135 is formed of a magnetic fluid, the bottom surface of the upper substrate 140 driving the flow path of the magnetic fluid, the center substrate 130 to facilitate the movement of the magnetic fluid and to form a closed flow path. A hydrophobic material may be selectively coated on the circumferential surface of the mobile flow channel 131 and the slope of the lower substrate 120. In addition, the upper and lower substrates are in close contact with the central substrate, thereby preventing the external detachment of the fluid.

In addition, when the moving body 135 is a magnetic material or a non-fluid non-fluid (for example, nickel that reacts to a solid-magnet) or a metallic material, the upper and lower substrates do not necessarily have to be in close contact with the center substrate. It can also be provided on a board | substrate, and two board | substrates can also be used for the board | substrate structure laminated. That is, the coil is disposed on the upper substrate, and the magnetic body can be moved by forming a flow path in the lower substrate. In this case, the magnetic material may be variously configured, such as a polygon or an ellipse.

The blocking layer 110 and the moving body 135 may be selected as materials for blocking light corresponding to the wavelength region of the image sensor. In addition, the coils 141 and 142 and the blocking layer 110 may be selectively formed at an appropriate position among the upper substrate 140 and the lower substrate 120.

In addition, when the permanent magnet is composed of a moving body, one coil is disposed, and when the current is applied to the coil in the forward direction, the moving body is moved in the forward direction, and when the current is applied in the reverse direction, the moving body is moved in the reverse direction. The through hole can be opened and closed. In addition, in the present invention, a plurality of coils may not be necessarily disposed on a specific substrate, but may be disposed on different substrates or different sides above and below the flow path.

6 is a schematic view showing the arrangement relationship between the plurality of coils 141 and 142 and the movable body 135 according to the present invention, and a state in which the upper substrate is removed. As shown, the center of the first coil 141 located in the center of the substrate and the moving body 135 is opposed.

The plurality of coils 141 and 142 are arranged diagonally and overlap a portion of the coils. The overlapping coil portions are wound using two metal layers. In addition, a portion connecting portion connecting the inner side of each coil 141 and 142 and a portion in which the two coils overlap each other may be manufactured to be spaced apart from the substrate using different metal layers, or may form an insulating layer in the region between the coil overlaps. And other coils can be stacked on it. These two coils may be constructed within a flexible printed circuit board.

7 is a front view of the shutter device according to the present invention, and FIG. 8 is a sectional view taken along line AA ′ of FIG. 7.

As shown in FIG. 7 and FIG. 8, the moving body 135 and the through hole 111 face each other under the center of the first coil 141. In this state, the moving body 135 may move left / right along the moving body flow path 131 by the current applied to the first coil 141 or the second coil 142 to open and close the through hole 111. .

Referring to the operation of the shutter device of the camera according to the invention as follows.

9 and 10, currents of a predetermined direction and magnitude are applied to the first coil 141 through first and second pads 145 and 146 formed at both ends of the first coil 141 to close the optical path. When flowing, the magnetic field B1 is formed on the through hole 111 in the center of the substrate by the first coil 141. At this time, the moving body 135 is moved along the moving channel 131 by the magnetic field is moved to the lower portion of the center of the first coil 141 to block the optical path. That is, the light is not passed through the moving object 135 which is positioned on the through hole 111 and is a light blocking material. In addition, current supply to the second coil 142 is cut off. That is, the current I1> 0 and I2 = 0.

9 and 11, the second coil 142 transmits a current having a predetermined direction and magnitude through the third and fourth pads 147 and 148 formed at both ends of the second coil 142 to open the optical path. When flowing to the magnetic field B2 is formed at the other side of the center of the substrate by the second coil 142, the movable body 135 is a lower portion of the center of the second coil 142 along the movable body flow path 131 by the magnetic field. Move to open the optical path. At this time, current supply to the first coil 141 is cut off. That is, the current I1 = 0 and I2> 0.

Accordingly, the light is controlled by opening and closing the through hole 111 by the movement of the movable body 135 which is moved by the current applied to the first or second coils 141 and 142. This current control is controlled by a servo or control unit for current control in the camera module.

12 is a flowchart illustrating a shutter control method of a compact camera according to the present invention.

Referring to Figure 12, the camera module is driven (S111), it is checked whether the through-hole opening or closing (S113). As a result of the check, if the through hole is open, the through hole open mode operation is started (S115), and current is supplied to the second coil to move the moving object to the other side of the moving path in the moving body flow path (S117). Open to pass the light (S119).

On the contrary, when the through hole is closed as a result of checking in S113, the close mode operation of the through hole is started (S121), and current is supplied to the first coil to move the moving body to one side in the moving body flow path (S123). It is closed to block the light (S125).

Here, as another example of the present invention, the plurality of coils may be installed on the lower substrate, not the upper substrate, and may be installed on the upper or lower surface of the central substrate in a range that does not interfere with the movement when the moving body is not a fluid. In addition, the blocking layer 110 may be disposed at any one of a bottom surface of the upper substrate and a bottom surface / top surface of the lower substrate.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

According to the shutter device of the ultra-compact camera according to the present invention, there is an effect that can be reduced in size, lighter than the conventional camera module using a step motor or an electromagnet.

In addition, by minimizing and storing the shutter device in the board area, it provides the image quality by adding a mechanical shutter function while occupying the minimum space, and applied to portable devices such as PDAs and mobile phones that can be manufactured in various structures according to the arrangement method of the optical module. There is a possible effect.

In addition, by enabling the shutter operation using the electromagnetic force, the control can be more effective.

In addition, since the shutter is formed of a coil and a magnetic material on the substrate, the shutter may be integrally formed on the substrate, and there is an effect that there is almost no additional space.

Claims (17)

A blocking film including a through hole which is a path through which external light is incident; A substrate having a movable body and a movable body moving in the movable channel and controlling opening and closing of light passing through the through hole; And Miniature camera shutter device including a substrate formed with two or more coils for controlling the movement of the moving body. The method of claim 1, Miniature camera shutter device characterized in that it further comprises a substrate on one side of the blocking film. The method of claim 2, And the substrates are stacked on each other to seal the movable flow path. The method of claim 1, And the movable body is moved by an electromagnetic force generated by the coil. The method according to claim 1 or 4, The movable body is a miniature camera shutter device, characterized in that it comprises a magnetic material that is moved by the electromagnetic force of the coil and a material blocking the light. The method of claim 1, The at least two coils are small camera shutter device, characterized in that arranged in such a way that some areas overlap each other. The method according to claim 1 or 6, Miniature camera shutter device, characterized in that the coil center of any one of the two or more coils coincide with the center of the through hole. The method of claim 1, The compact camera shutter device, characterized in that the direction of forming the movable flow path and the direction of connecting the center of the two or more coils coincide. delete delete delete delete delete delete delete delete delete

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