专利汇可以提供Method and device for controlling auto macro function of lens module专利检索,专利查询,专利分析的服务。并且A method for controlling an auto macro function of a lens module is provided. Firstly, a control switching module is provided. The both terminals of the coil of the lens module are connected to a power source and the control switching module, respectively. In response to a first signal state of a control signal, a constant current is transmitted from the power source to the coil. The magnets attached on the magnet yoke provide a permanent magnetic field, and the constant current passing through the coil causes a magnetic force to be generated on the coil while moving the lens holder toward the magnet yoke by a constant distance. In response to a second signal state of the control signal, the power source stops transmitting the constant current to the coil, wherein a restoring force generated by the deformed spring causes the lens holder to return to its original position.,下面是Method and device for controlling auto macro function of lens module专利的具体信息内容。
What is claimed is:
This application claims priority under 35 U.S.C. §119 to Taiwan Patent Application No. 097147387, filed on Dec. 5, 2008, in the Taiwan Intellectual Property Office, the entire contents of which are hereby incorporated by reference.
The present invention relates to a method and a device for controlling an auto macro function of a lens module, and more particularly to a method and a device for controlling an auto macro function of a lens module that is driven by a voice coil motor.
As known, a lens module that is driven by a voice coil motor (VCM) is advantageous for reducing the overall size of the lens module and lowering the product price. Nowadays, the voice coil motor is applied to the lens module having an auto focus function and/or an auto macro function. The auto focus function enables the optical system to obtain correct focus on a subject without requiring the operator to manually adjust focus. The auto macro function allows for close-up shots when the distant from the subject is very short. As known, the method and the device currently used to control the auto macro function of a VCM-driven lens module are very complicated and costly.
Hereinafter, the operations of the controlling device 10 will be illustrated with reference to
In other words, the conventional controlling device 10 and the conventional controlling method as described in
For implementing an auto macro function on the basis of the controlling device 10, many manufacturers may alter some operating modes of the driver IC of the multi-stage controlling module 12. For example, except that the maximum focal length mode and the minimum focal length mode are enabled, the other focal length modes of the driver IC are disabled. Alternatively, the driver IC may change the flowing direction of the variable current S12 to move forward or backward the lens of the lens module 11 in order to implement the auto macro function.
Since the use of the driver IC to implement the auto macro function of the lens module is very costly, there is a need of providing a cost-effective device for controlling the auto macro function of the lens module.
It is an object of the present invention to provide a cost-effective and simplified device for controlling an auto macro function of a lens module.
Another object of the present invention provides a simplified method for controlling an auto macro function of a lens module.
In accordance with an aspect of the present invention, there is provided a method for controlling an auto macro function of a lens module. The lens module includes an upper coupling element, a single spring disposed under the upper coupling element, a magnet yoke disposed under the single spring, multiple magnets, a lens holder supporting a coil and a lens, and a lower coupling element. The coil has a first terminal connected to a power source. The method includes the following steps. Firstly, a control switching module is provided. The control switching module is operated at either a first switching state or a second switching state and connected to a second terminal of the coil in series Then, a control signal is issued to the control switching module. When the control switching module is operated at the first switching state in response to the control signal, a constant current is transmitted from the power source to the coil. The magnets attached on the magnet yoke provide a permanent magnetic field, and the constant current passing through the coil causes a magnetic force to be generated on the coil while moving the lens holder toward the magnet yoke by a constant distance, so that the lens holder is sustained against sustained against the spring. When the control switching module is operated at the second switching state in response to the control signal, the power source stops transmitting the constant current to the coil, wherein a restoring force generated by the deformed spring causes the lens holder to return to its original position.
In an embodiment, the single spring is a single flat spring including a lower inner rim, an upper outer rim and an elastic serpentine structure between the lower inner rim and the upper outer rim, which are connected with each other and disposed on the same plane.
In an embodiment, the magnet yoke includes a cylindrical inner wall, an outer wall and a top wall. The top wall is outwardly extended from an upper edge of the cylindrical inner wall, and the outer wall is downwardly and axially extended from a periphery of the top wall.
In an embodiment, the outer wall includes multiple extension slices. The magnets are attached on inner surfaces of respective extension slices of the magnet yoke. The multiple extension slices of the magnet yoke have rectangular shapes and are substantially perpendicular to the top wall and arranged at diametrically opposed locations of the top wall at regular intervals.
In an embodiment, the outer wall is annular and downwardly and axially extended from a periphery of the top wall such that the outer wall encloses the cylindrical inner wall.
In an embodiment, at least one flange is circumferentially and outwardly extended from a lower periphery of the lens holder for supporting the coil. The at least one flange includes two horizontal protrusions circumferentially and outwardly extended from the lower periphery of the lens holder and arranged at regular intervals, or the flange is an annular flange circumferentially and outwardly extended from the lower periphery of the lens holder.
In an embodiment, the constant distance is determined according to a gap between the flange and a bottom of the cylindrical inner wall of the magnet yoke. Alternatively, the constant distance is determined according to a gap between several salient structures on an upper edge of the lens holder and a bottom of the upper coupling element.
In an embodiment, the control switching module includes a transistor and a current-limiting resistor. The first switching state and the second switching state indicate that the transistor is in a saturation mode and a cutoff mode, respectively. The control switching module is operated at the first switching state when the transistor is in a saturation mode in response to the control signal at the first signal state. The control switching module is operated in the second switching state when the transistor is in a cutoff mode in response to the control signal at the second signal state.
In an embodiment, the first signal state and the second state are a high-level state and a low-level state, respectively.
In accordance with another aspect of the present invention, there is provided a method for controlling an auto macro function of a lens module. The lens module includes a magnet yoke, multiple magnets attached on the magnet yoke, a single spring disposed above the magnet yoke and a lens holder supporting a coil and a lens. The magnets axially surround the coil and are separated from the coil by a gap.
The method includes the following steps. Firstly, a power source is connected with a first terminal of the coil. A control switching module is connected to a second terminal of the coil and a ground terminal such that the power source, the coil, the control switching module and the ground terminal are connected in series. The control switching module is operated at either a first switching state or a second switching state. Then, a control signal having a first signal state and a second signal state is issued to the control switching module. When the control switching module is operated at the first switching state in response to the control signal at the first signal state, a constant current is transmitted from the power source to the coil. The magnets attached on the magnet yoke provide a permanent magnetic field, and the constant current passing through the coil causes a magnetic force to be generated on the coil while moving the lens holder toward the magnet yoke by a constant distance, so that the lens holder is sustained against sustained against the spring, when the control switching module is operated at the second switching state in response to the control signal at the second signal state, the power source stops transmitting the constant current to the coil, wherein a restoring force generated by the deformed spring causes the lens holder to return to its original position.
In accordance with a further aspect of the present invention, there is provided a device for controlling an auto macro function of a lens module. The lens module includes a magnet yoke, multiple magnets attached on the magnet yoke, a single spring disposed above the magnet yoke and a lens holder supporting a coil and a lens. The magnets axially surround the coil and are separated from the coil by a gap. The controlling device includes a power source, a control switching module and a micro processor. The power source is connected with a first terminal of the coil. The control switching module is operated at either a first switching state or a second switching state. The control switching module is connected to a second terminal of the coil and a ground terminal such that the power source, the coil, the control switching module and the ground terminal are connected in series. The micro processor issues a control signal having a first signal state and a second signal state to the control switching module. The magnets attached on the magnet yoke provide a permanent magnetic field. When the control switching module is operated at the first switching state in response to the control signal at the first signal state, a constant current is transmitted from the power source to the coil. The constant current passing through the coil causes a magnetic force to be generated on the coil while moving the lens holder toward the magnet yoke by a constant distance, so that the lens holder is sustained against sustained against the spring. When the control switching module is operated at the second switching state in response to the control signal at the second signal state, the power source stops transmitting the constant current to the coil, so that a restoring force generated by the deformed spring causes the lens holder to return to its original position.
The above objects and advantages of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
The present invention relates to a method and a device for controlling an auto macro function of a lens module that is driven by a voice coil motor.
As shown in
In a case that the control signal S21 issued by the micro processor 23 is at a first signal state (e.g. a low-level state), the transistor 221 is operated in the saturation mode and thus a constant current S22 is transmitted from the power source Vcc to the ground terminal GND through the coil 211, the current-limiting resistor 222 and the transistor 221. Since the magnets attached on the magnet yoke of the lens module 21 provide a permanent magnetic field and the magnets axially surrounding the coil and is separated from the coil by a gap (as shown in
Whereas, in a case that the control signal S21 issued by the micro processor 23 is at a second signal state (e.g. a high-level state), the transistor 221 is operated in the cutoff mode and the power source Vcc stops transmitting the constant current S22 to the coil 211. Meanwhile, the magnetic force generated on the coil 211 is eliminated. As such, the restoring force generated by the deformed spring will cause the lens holder to return to its original position.
Hereinafter, a method of controlling an auto focus function of a lens module will be illustrated with reference to a flowchart of
After the controlling method is started (Step 31), a lens module including a magnet yoke, multiple magnets attached on the magnet yoke, a single spring disposed above the magnet yoke and a lens holder supporting a coil and a lens is provided, wherein the magnets axially surrounds the coil and is separated from the coil by a gap (Step 32). Next, a power source Vcc is connected to the first terminal A2 of the coil (Step 33). Next, a control switching module is provided, wherein the control switching module is operated at either a first switching state or a second switching state and connected between the second terminal B2 of the coil and the ground terminal GND such that the power source Vcc, the coil, the control switching module and the ground terminal GND are connected in series (Step 34). Next, a control signal having a first signal state and a second signal state is transmitted to the control switching module, wherein the magnets attached on the magnet yoke provide a permanent magnetic field, a constant current is transmitted from the power source to the coil when the control switching module is operated at the first switching state in response to the control signal at the first signal state, and the current passing through the coil causes a magnetic force to be generated on the coil while moving the lens holder toward the magnet yoke by a constant distance, so that the lens holder is sustained against sustained against the spring, wherein the power source stops transmitting the constant current to the coil when the control switching module is operated at the second switching state in response to the control signal at the second signal state, so that a restoring force generated by the deformed spring causes the lens holder to return to its original position (Step 35). Meanwhile, the method of controlling the auto focus function of the lens module is completed (Step 36).
As shown in the drawings, several engaging posts 411 are extended downwardly from the edges of the upper coupling element 41 along the axial direction 401. The spring 42 is disposed under the upper coupling element 41. An elastic serpentine structure 423 is arranged between a lower inner rim 421 and an upper outer rim 422 of the spring 42. The lower inner rim 421 and the upper outer rim 422 are disposed on different planes in the spatial space. The magnet yoke 43 is disposed under the spring 42. The magnet yoke 43 has a cylindrical inner wall 431, an outer wall 432 and a top wall 433. The top wall 433 is outwardly extended from the upper edge of the cylindrical inner wall 431. The outer wall 432 is extended downwardly from the periphery of the top wall 433 along the axial direction 401 such that the outer wall 432 encloses the cylindrical inner wall 431. In addition, the axial height of the cylindrical inner wall 431 is smaller than the outer wall 432. Moreover, the magnets 44 are attached on the inner surface of the outer wall 432 of the magnet yoke 43.
The lens holder 46 is tubular and has a thread structure 461 formed on the inner surface thereof, so that a lens (no shown) is fixed onto the thread structure 461. In addition, an annular flange 4621 is circumferentially and outwardly extended from the lower periphery 462 of the lens holder 46 so as to support the coil 45 thereon. During the lens module 40 is operated, the annular flange 4621 is sustained against the bottom of the cylindrical inner wall 431 of the magnet yoke 43. The coil 45 has a first terminal A3 and a second terminal B3. The first terminal A3 is electrically connected to a power source Vcc as shown in
The lower coupling element 47 has several engaging grooves 471 and several retaining posts 473. The engaging grooves 471 mate with the engaging posts 411 of the upper coupling element 41. The retaining posts 473 are disposed on the lower surface of the lower coupling element 47. Via the engagement between the engaging grooves 471 and the engaging posts 411, the upper coupling element 41, the spring 42, the magnet yoke 43 with the attached magnets 44, the lens holder 46 with the supported coil 45, and the lower coupling element 47 are combined together to assemble the lens module 40.
As shown in the drawings, several engaging posts 511 are extended downwardly from the edges of the upper coupling element 51 along the axial direction 501. The spring 52 is a single flat spring and disposed under the upper coupling element 51. An elastic serpentine structure 523 is arranged between a lower inner rim 521 and an upper outer rim 522 of the spring 52. The lower inner rim 521, the upper outer rim 522 and the elastic serpentine structure 523 are connected with each other and disposed on the same plane.
The magnet yoke 53 is disposed under the spring 52. The magnet yoke 53 has a cylindrical inner wall 531, a plurality of extension slices 532 and a top wall 533. The top wall 533 is outwardly extended from the upper edge of the cylindrical inner wall 531. The extension slices 532 are extended downwardly from the periphery of the top wall 533 along the axial direction 501 such that the extension slices 532 are concentric with the cylindrical inner wall 531 and circumferentially arranged on the top wall 533 at regular intervals. In addition, the axial height of the cylindrical inner wall 531 is smaller than the axial height of each extension slice 532. The magnets 54 are attached on the inner surfaces of the extension slices 532 of the magnet yoke 53. Moreover, the extension slices 532 of the magnet yoke 53 have rectangular shapes and are substantially perpendicular to the top wall 533. In this embodiment, the magnet yoke 53 has two extension slices 532 which are arranged at two diametrically opposed locations of the top wall 533.
The lens holder 56 is tubular and has a thread structure 561 formed on the inner surface thereof, so that a lens 58 (as shown in
The base 572 of the lower coupling element 57 has several engaging grooves 5721. The engaging grooves 5721 mate with the engaging posts 511 of the upper coupling element 51. Via the engagement between the engaging grooves 5721 and the engaging posts 511, the upper coupling element 51, the spring 52, the magnet yoke 53 with the attached magnets 54, the lens holder 56 with the supported coil 55 and the lower coupling element 57 are combined together to assemble the lens module of the present invention.
Hereinafter, the principles of implementing the auto macro function of the lens module 50 shown in
In a case that the transistor 221 is in the saturation mode, the constant current S22 is transmitted from the power source Vcc to the coil 55. Since the magnets 54 attached on the magnet yoke 53 provide a permanent magnetic field, the constant current S22 passing through the coil 55 will cause a magnetic force to be generated on the coil 55 while moving the lens holder 56 toward the magnet yoke 53 by a constant distance L1 (as shown in
In a case that the transistor 221 is at the cutoff state, the power source Vcc stops transmitting the constant current S22 to the coil 55. The restoring force generated by the deformed spring 52 will cause the lens holder to return to its original position (as shown in
Please refer to
From the above description, it is found that the method and the device for controlling the auto macro function of the lens module according to the present invention are simplified and cost-effective in comparison with the prior art.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
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