Patent Description:
With the development of semiconductor manufacturing technology, the performance of image sensors has been improved, and the pixel size thereof has been scaled down. Therefore, featuring high image quality becomes one of the indispensable features of an optical system nowadays. Furthermore, due to the rapid changes in technology, electronic devices equipped with optical systems are trending towards multi-functionality for various applications, and therefore the functionality requirements for the optical systems have been increasing.

In recent years, there is an increasing demand for electronic devices featuring compact size, but conventional optical systems, especially the telephoto optical systems with a long focal length, are difficult to meet both the requirements of high image quality and miniaturization. Conventional telephoto optical systems usually have shortcomings of poor zooming position, thereby unable to meet the requirements of the current technology trends. Therefore, how to improve the zooming position accuracy of the telephoto optical systems for meeting the requirement of high-end-specification electronic devices is an important topic in this field nowadays. Prior art can be found in <CIT> disclosing (A1 B2) A camera actuator for implementing automatic focusing and zooming, and a compact camera including the same. The camera actuator includes a base, at least one driving unit, and at least one optical unit. The base has an internal accommodation space, is open at both ends thereof in a direction in which light travels, and has at least one opening in one side surface thereof. The driving unit includes a substrate fitted in the opening of the base and mounted with at least one coil on a surface facing the internal accommodation space of the base. The optical unit is provided in the internal accommodation space of the base and configured to be movable in an optical axis direction. The optical unit is mounted with a magnet on a surface facing the substrate. Further prior art can be found in <CIT> disclosing a lens position controller of camera with a reference signal generator provided in polarising pattern of magnetic scale which generates signal showing standard position of magnetic scale.

According to one aspect of the present disclosure, an imaging lens module includes at least one imaging lens unit, an optical folding component and a sensing magnet group. The at least one imaging lens unit includes at least one plastic lens barrel and at least one plastic lens element group and has an optical axis. The at least one plastic lens element group is accommodated in the at least one plastic lens barrel. The optical axis passes through the at least one plastic lens element group. The optical folding component is configured to fold an incident optical path into the at least one imaging lens unit to coincide with the optical axis. The sensing magnet group includes at least two sensing magnets that are sequentially disposed on the at least one plastic lens barrel along a direction in parallel with the optical axis. The at least two sensing magnets are located at the same side with respect to a reference plane that passes through the optical axis, and the reference plane has a normal direction perpendicular to the optical axis. When the at least two sensing magnets are observed from the direction in parallel with the optical axis, images of the at least two sensing magnets are at least partially overlapped. Two adjacent magnetic poles of the at least two sensing magnets are like poles between which there is a repulsive force. When a shortest distance along the direction in parallel with the optical axis between two magnetic like poles among the at least two sensing magnets is Dp, a longest distance along the direction in parallel with the optical axis between two magnetic poles among the at least two sensing magnets is Dm, and a total quantity of the at least two sensing magnets is Nt, the following condition is satisfied: <MAT>.

According to another aspect of the present disclosure, an electronic device includes the aforementioned imaging lens module and an image sensor, wherein the image sensor is disposed on an image surface of the imaging lens module. The image sensor is configured to convert light passing through the at least one imaging lens unit into an optical image signal.

The present disclosure provides an imaging lens module that can include a base, a frame component, a plurality of rollable supporters, at least one imaging lens unit, an optical folding component, a sensing magnet group, a flexible printed circuit board, a driving coil group and a hall sensing component group.

The frame component can be coupled to the base so as to form an accommodation space therebetween.

The at least one imaging lens unit is movably located in the accommodation space. Specifically, the at least one imaging lens unit includes at least one plastic lens barrel and at least one plastic lens element group and has an optical axis. The at least one plastic lens barrel is movably supported by the base. The at least one plastic lens element group is accommodated in the at least one plastic lens barrel. The optical axis passes through the at least one plastic lens element group. Moreover, the base can have a guide groove that can extend along a direction in parallel with the optical axis and face the at least one imaging lens unit so as to guide the movement of the at least one imaging lens unit. Therefore, it is favorable for stabilizing the movement process of the at least one imaging lens unit. Moreover, the at least one imaging lens unit can also be movably supported by the base via the plurality of rollable supporters. That is, the plurality of rollable supporters can be located in the accommodation space and disposed between the at least one imaging lens unit and the base. Therefore, it is favorable for reducing sliding friction resistance generated in the movement process of the at least one imaging lens unit. Moreover, the rollable supporters can be disposed in the guide groove. Therefore, it is favorable for maintaining a relatively high driving collimation of the at least one imaging lens unit.

The optical folding component can be located in the accommodation space and can be disposed at an object side of the at least one imaging lens unit. The optical folding component can be a reflection mirror or a prism for folding an incident optical path into the at least one imaging lens unit to coincide with the optical axis. Therefore, it is favorable for miniaturizing the imaging lens module.

The sensing magnet group can be located in the accommodation space. Specifically, the sensing magnet group includes at least two sensing magnets that are sequentially disposed on the at least one plastic lens barrel along a direction in parallel with the optical axis. The at least two sensing magnets are located at the same side with respect to a reference plane that passes through the optical axis, and the reference plane has a normal direction perpendicular to the optical axis. Moreover, when the at least two sensing magnets are observed from the direction in parallel with the optical axis, images of the at least two sensing magnets are at least partially overlapped. Therefore, it is favorable for having flux density not excessively changed in the direction in parallel with the optical axis. Moreover, the sensing magnet group can also include three or more sensing magnets. Please refer to <FIG>, which is a chart showing flux density corresponding to the configuration of the sensing magnet group.

Two adjacent magnetic poles of the at least two sensing magnets are like poles between which there is a repulsive force. Moreover, the adjacent two magnetic like poles can be spaced apart from each other so as to ensure continuity of flux density. Therefore, it is favorable for ensuring sufficient flux density between the adjacent two magnetic like poles, and it is also favorable for ensuring that a release point will not exist in the period where hysteresis of the hall sensing component group occurs.

The flexible printed circuit board can be supported by the frame component. The flexible printed circuit board has flexibility. Therefore, it is favorable for further miniaturizing the imaging lens module.

The driving coil group can be disposed on the flexible printed circuit board along a direction in parallel with the optical axis. Moreover, the driving coil group and the sensing magnet group can be disposed opposite to each other so as to generate a Lorentz force by electromagnetic interaction therebetween. The Lorentz force can be a magnetic driving force for moving the at least one plastic lens barrel along a direction in parallel with the optical axis. Moreover, the driving efficiency of the driving coil group can be optimized by a proper space configuration.

The hall sensing component group can include at least two hall sensing components that are sequentially soldered on the flexible printed circuit board along a direction in parallel with the optical axis. Moreover, the hall sensing component group can also include three or more hall sensing components. Moreover, the hall sensing component group and the sensing magnet group can be disposed opposite to each other so as to sense a displacement of the at least one plastic lens barrel along the direction in parallel with the optical axis. Specifically, one of the at least two sensing magnets can be disposed corresponding to one of the at least two hall sensing component. When the sensing magnet is moved away from the corresponding hall sensing component due to the movement of the plastic lens barrel, the corresponding relationship therebetween can be replaced by another hall sensing component and the sensing magnet so as to sense the position of the sensing magnet, thereby obtaining the position of the plastic lens barrel which the sensing magnet is disposed on. Moreover, the sensing efficiency of the hall sensing component group can be optimized by a proper space configuration.

According to the present disclosure, the imaging lens module can further include at least one fixed imaging lens unit. The at least one fixed imaging lens unit includes at least one fixed plastic lens barrel and at least one fixed plastic lens element group that is accommodated in the at least one fixed plastic lens barrel. The at least one fixed imaging lens unit is immovable with respect to the base, while the at least one imaging lens unit is movable with respect to the base. Therefore, it is favorable for responding to an optical design requirement that only partial lens elements are moved for achieving zooming function so as to increase design flexibility and correspond to a relatively high-end optical requirement. Please refer to <FIG>, <FIG> and <FIG>, which respectively show the fixed imaging lens units <NUM>, <NUM> and <NUM> according to the 1st, 3rd and 4th embodiments of the present disclosure.

According to the present disclosure, the imaging lens module can further include an optical image stabilizer configured to be disposed on an image sensor for stabilizing an optical image signal on an image sensor converted from light passing through the at least one imaging lens unit. Therefore, it is favorable for providing a more reliable method for capturing the optical image signal so as to increase image quality. Please refer to <FIG> and <FIG>, which show the optical image stabilizer 5a according to the 5th embodiment of the present disclosure.

According to the present disclosure, the imaging lens module can further include an auxiliary sensing magnet group, an auxiliary driving coil group and an auxiliary hall sensing component group that are disposed on the optical image stabilizer. Therefore, it is favorable for the auxiliary sensing magnet group, the auxiliary driving coil group and the auxiliary hall sensing component group to collaborate with one another, such that the image sensor is in a condition that can be driven so as to achieve an optical image stabilization function. Please refer to <FIG> and <FIG>, which show the auxiliary sensing magnet group 5b, the auxiliary driving coil group 5c and the auxiliary hall sensing component group 5d according to the 5th embodiment of the present disclosure.

When a shortest distance along the direction in parallel with the optical axis between two magnetic like poles among the at least two sensing magnets is Dp, a longest distance along the direction in parallel with the optical axis between two magnetic poles among the at least two sensing magnets is Dm, and the total quantity of the at least two sensing magnets is Nt, the following condition is satisfied: <NUM> < Nt×Dp/(Dm-(Nt-<NUM>)×Dp) < <NUM>. Therefore, it is favorable for ensuring continuity of flux density between the sensing magnets, thereby accurately positioning the at least one plastic lens barrel. Moreover, the following condition can also be satisfied: <NUM> < Nt×Dp/(Dm-(Nt-<NUM>)×Dp) < <NUM>. Therefore, it is favorable for increasing the sensing accuracy of the hall sensing component group. Please refer to <FIG>, which shows Dp and Dm according to the 1st embodiment of the present disclosure.

When the shortest distance along the direction in parallel with the optical axis between two magnetic like poles among the at least two sensing magnets is Dp, and the longest distance along the direction in parallel with the optical axis between two magnetic poles among the at least two sensing magnets is Dm, the following condition can be satisfied: <NUM> < Dp/Dm < <NUM>. Therefore, it is favorable for ensuring the sensing efficiency of the hall sensing component group. Moreover, the following condition can also be satisfied: <NUM> < Dp/Dm < <NUM>.

When the shortest distance along the direction in parallel with the optical axis between two magnetic like poles among the at least two sensing magnets is Dp, and a shortest distance along the direction in parallel with the optical axis between the at least two hall sensing components is Dh, the following condition can be satisfied: <NUM> < Dh/Dp < <NUM>. Therefore, it is favorable for ensuring flux density of the sensing magnets can be accurately sensed by the hall sensing component group. Please refer to <FIG>, which shows Dp and Dh according to the 1st embodiment of the present disclosure.

According to the present disclosure, the aforementioned features and conditions can be utilized in numerous combinations so as to achieve corresponding effect.

Please refer to <FIG>, where <FIG> is a perspective view of the imaging lens module according to the 1st embodiment of the present disclosure, <FIG> is a partially exploded view of the imaging lens module in <FIG>, <FIG> is an exploded view of the imaging lens module in <FIG>, <FIG> is another exploded view of the imaging lens module in <FIG>, <FIG> is a front view showing the configuration of a flexible printed circuit board, a driving coil group, a hall sensing component group and a sensing magnet group of the imaging lens module in <FIG>, <FIG> is a side view showing the configuration of the flexible printed circuit board, the driving coil group, the hall sensing component group and the sensing magnet group of the imaging lens module in <FIG>, and <FIG> is a chart showing flux density and output voltage corresponding to the configuration of the driving coil group, the hall sensing component group and the sensing magnet group in <FIG>.

This embodiment provides an imaging lens module <NUM> that includes a base <NUM>, a frame component <NUM>, a plurality of rollable supporters <NUM>, a movable imaging lens unit <NUM>, a fixed imaging lens unit <NUM>, an optical folding component <NUM>, a sensing magnet group <NUM>, a flexible printed circuit board <NUM>, a driving coil group <NUM> and a hall sensing component group <NUM>.

The base <NUM> has a plurality of guide grooves <NUM> that extend along the same direction.

The frame component <NUM> is coupled to the base <NUM> so as to form an accommodation space AS therebetween.

The rollable supporters <NUM> are located in the accommodation space AS and disposed in the guide grooves <NUM>.

The movable imaging lens unit <NUM> is movably located in the accommodation space AS. Specifically, the movable imaging lens unit <NUM> includes a movable plastic lens barrel <NUM> and a movable plastic lens element group <NUM> and has an optical axis OA. The movable plastic lens barrel <NUM> has a plurality of guide grooves <NUM> that face and correspond to the guide grooves <NUM> of the base <NUM>. The rollable supporters <NUM> are sandwiched by the guide grooves <NUM> and <NUM> and are able to roll along an extension direction of the guide grooves <NUM> and <NUM>, such that the movable plastic lens barrel <NUM> is movably supported by the base <NUM>. The movable plastic lens element group <NUM> is accommodated in the movable plastic lens barrel <NUM> and is able to be moved with respect to the base <NUM> by the movable plastic lens barrel <NUM>. The optical axis OA passes through the movable plastic lens element group <NUM>, and a direction of the optical axis OA is in parallel with the extension direction of the guide grooves <NUM> and <NUM>.

The fixed imaging lens unit <NUM> is immovably located in the accommodation space AS and disposed at an object side of the movable imaging lens unit <NUM>. The fixed imaging lens unit <NUM> includes a fixed plastic lens barrel <NUM> and a fixed plastic lens element group <NUM> that is accommodated in the fixed plastic lens barrel <NUM>. Please be noted that each of the movable plastic lens element group <NUM> and the fixed plastic lens element group <NUM> can include one or more lens elements, and the present disclosure is not limited thereto.

The optical folding component <NUM> is located in the accommodation space AS and disposed at an object side of the fixed imaging lens unit <NUM>. The optical folding component <NUM> may be a reflection mirror or a prism that is able to fold an incident optical path IOP from outside into the fixed imaging lens unit <NUM> and the movable imaging lens unit <NUM> so as to coincide with the optical axis OA.

The sensing magnet group <NUM> is located in the accommodation space AS. Specifically, the sensing magnet group <NUM> includes a first sensing magnet <NUM> and a second sensing magnet <NUM> that are sequentially disposed on the movable plastic lens barrel <NUM> along a direction in parallel with the optical axis OA. The first sensing magnet <NUM> and the second sensing magnet <NUM> are located at the same side with respect to a reference plane (not shown) that passes through the optical axis OA, and the reference plane has a normal direction perpendicular to the optical axis OA. That is, the optical axis OA is located on the reference plane. When the first sensing magnet <NUM> and the second sensing magnet <NUM> are observed from the direction in parallel with the optical axis OA, images of the first sensing magnet <NUM> and the second sensing magnet <NUM> are at least partially overlapped. Two adjacent magnetic poles of the first sensing magnet <NUM> and the second sensing magnet <NUM> are south poles between which there is a repulsive force.

The flexible printed circuit board <NUM> is supported by the frame component <NUM>, and the flexible printed circuit board <NUM> has flexibility.

The driving coil group <NUM> is disposed on the flexible printed circuit board <NUM> along a direction in parallel with the optical axis OA. The driving coil group <NUM> includes six driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> that are opposite to the first sensing magnet <NUM> and the second sensing magnet <NUM> of the sensing magnet group <NUM>. The driving coil group <NUM> and the sensing magnet group <NUM> generate a Lorentz force by electromagnetic interaction therebetween that can be a magnetic driving force for moving the movable plastic lens barrel <NUM> along a direction in parallel with the optical axis OA. When the movable plastic lens barrel <NUM> is in its original position, the first sensing magnet <NUM> corresponds to three driving coils <NUM>, <NUM> and <NUM>, and the second sensing magnet <NUM> corresponds to another three driving coils <NUM>, <NUM> and <NUM>, such that the first sensing magnet <NUM> and the second sensing magnet <NUM> can at least partially opposite to the driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrel <NUM>, thereby ensuring a sufficient magnetic driving force can be continuously generated therebetween.

The hall sensing component group <NUM> includes six hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> that are sequentially soldered on the flexible printed circuit board <NUM> along a direction in parallel with the optical axis OA and may be respectively located at central positions of the driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, as shown in <FIG>. When the movable plastic lens barrel <NUM> is in its original position, the first sensing magnet <NUM> corresponds to three hall sensing components <NUM>, <NUM> and <NUM>, and the second sensing magnet <NUM> corresponds to another three hall sensing components <NUM>, <NUM> and <NUM>, such that the first sensing magnet <NUM> and the second sensing magnet <NUM> can at least partially opposite to the hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrel <NUM>, thereby accurately sensing the positions of the first sensing magnet <NUM> and the second sensing magnet <NUM>, then obtaining the position of the movable plastic lens barrel <NUM>, and thus calculating the displacement of the movable plastic lens barrel <NUM>.

Specifically, by a proper space configuration, flux density generated by the sensing magnet group <NUM> along the direction in parallel with the optical axis OA can be referred to the chart in <FIG>. As shown in <FIG>, the flux density changes along the direction in parallel with the optical axis OA according to the positions of the magnetic poles of the first sensing magnet <NUM> and the second sensing magnet <NUM>, and an output voltage can be generated on the hall sensing component group <NUM> from a release point to a working point of the flux density. The hall sensing component group <NUM> can obtain the high potential H and the low potential L of the output voltage to deduce the position of each magnetic pole of the sensing magnet group <NUM>, thereby timely obtaining the position of the movable plastic lens barrel <NUM>. Note that the proper space configuration will be achieved by the following conditions.

When a shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> is Dp, a longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> is Dm, and the total quantity of the sensing magnets of the sensing magnet group <NUM> is Nt, the following conditions are satisfied: Dp = <NUM> [mm]; Dm = <NUM> [mm]; Nt = <NUM>; and Nt×Dp/(Dm-(Nt-<NUM>)×Dp) = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> is Dp, and the longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> is Dm, the following condition is satisfied: Dp/Dm = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> is Dp, and a shortest distance along the direction in parallel with the optical axis OA between the hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is Dh, the following condition is satisfied: Dh = <NUM> [mm]; and Dh/Dp = <NUM>.

Please refer to <FIG>, where <FIG> is a perspective view of the imaging lens module according to the 2nd embodiment of the present disclosure, <FIG> is a partially exploded view of the imaging lens module in <FIG>, <FIG> is an exploded view of the imaging lens module in <FIG>, <FIG> is another exploded view of the imaging lens module in <FIG>, <FIG> is a front view showing the configuration of a flexible printed circuit board, a driving coil group, a hall sensing component group and a sensing magnet group of the imaging lens module in <FIG>, <FIG> is a side view showing the configuration of the flexible printed circuit board, the driving coil group, the hall sensing component group and the sensing magnet group of the imaging lens module in <FIG>, and <FIG> is a chart showing flux density and output voltage corresponding to the configuration of the driving coil group, the hall sensing component group and the sensing magnet group in <FIG>.

This embodiment provides an imaging lens module <NUM> that includes a base <NUM>, a frame component <NUM>, a plurality of rollable supporters <NUM>, two movable imaging lens units <NUM>, an optical folding component <NUM>, two sensing magnet groups <NUM>, a flexible printed circuit board <NUM>, two driving coil groups <NUM> and two hall sensing component groups <NUM>.

The movable imaging lens units <NUM> are movably located in the accommodation space AS. Specifically, the movable imaging lens units <NUM> each include a movable plastic lens barrel <NUM> and a movable plastic lens element group <NUM> and has an optical axis OA. The movable plastic lens barrels <NUM> each have a plurality of guide grooves <NUM> that face and correspond to the guide grooves <NUM> of the base <NUM>. The rollable supporters <NUM> are sandwiched by the guide grooves <NUM> and <NUM> and are able to roll along an extension direction of the guide grooves <NUM> and <NUM>, such that the movable plastic lens barrels <NUM> are movably supported by the base <NUM>. The movable plastic lens element groups <NUM> are respectively accommodated in the movable plastic lens barrels <NUM> and are able to be moved with respect to the base <NUM> by the movable plastic lens barrels <NUM>. The optical axis OA passes through the movable plastic lens element groups <NUM>, and a direction of the optical axis OA is in parallel with the extension direction of the guide grooves <NUM> and <NUM>. Please be noted that each of the movable plastic lens element groups <NUM> can include one or more lens elements, and the present disclosure is not limited thereto.

The optical folding component <NUM> is located in the accommodation space AS and disposed at an object side of the movable imaging lens units <NUM>. The optical folding component <NUM> may be a reflection mirror or a prism that is able to fold an incident optical path IOP from outside into the movable imaging lens units <NUM> so as to coincide with the optical axis OA.

The sensing magnet groups <NUM> are located in the accommodation space AS. Specifically, the sensing magnet groups <NUM> each include a first sensing magnet <NUM> and a second sensing magnet <NUM> that are sequentially disposed on one of the movable plastic lens barrels <NUM> along directions in parallel with the optical axis OA. The sensing magnet groups <NUM> are respectively located at two opposite sides of the optical axis OA, the first sensing magnet <NUM> and the second sensing magnet <NUM> of each sensing magnet group <NUM> are located at the same side with respect to a reference plane (not shown) that passes through the optical axis OA, and the reference plane has a normal direction perpendicular to the optical axis OA. That is, the optical axis OA is located on the reference plane. When the first sensing magnet <NUM> and the second sensing magnet <NUM> of each sensing magnet group <NUM> are observed from the direction in parallel with the optical axis OA, images of the first sensing magnet <NUM> and the second sensing magnet <NUM> of each sensing magnet group <NUM> are at least partially overlapped. Two adjacent magnetic poles of the first sensing magnet <NUM> and the second sensing magnet <NUM> of each sensing magnet group <NUM> are south poles between which there is a repulsive force.

The driving coil groups <NUM> are disposed on the flexible printed circuit board <NUM> along directions in parallel with the optical axis OA. The driving coil groups <NUM> each include three driving coils <NUM>, <NUM> and <NUM> that are opposite to the first sensing magnet <NUM> and the second sensing magnet <NUM> of one of the sensing magnet groups <NUM>. The driving coil groups <NUM> and the sensing magnet groups <NUM> generate Lorentz forces by electromagnetic interaction therebetween that can be magnetic driving forces for moving the movable plastic lens barrels <NUM> along a direction in parallel with the optical axis OA. When the movable plastic lens barrels <NUM> are in their original positions, the first sensing magnets <NUM> correspond to the driving coils <NUM>, and the second sensing magnets <NUM> correspond to the driving coils <NUM> and <NUM>, such that the first sensing magnets <NUM> and the second sensing magnets <NUM> can at least partially opposite to the driving coils <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrels <NUM>, thereby ensuring sufficient magnetic driving forces can be continuously generated therebetween.

The hall sensing component groups <NUM> each include three hall sensing components <NUM>, <NUM> and <NUM> that are sequentially soldered on the flexible printed circuit board <NUM> along directions in parallel with the optical axis OA and may be respectively located at central positions of the driving coils <NUM>, <NUM> and <NUM>, as shown in <FIG>. When the movable plastic lens barrels <NUM> are in their original positions, the first sensing magnets <NUM> correspond to the hall sensing components <NUM>, and the second sensing magnets <NUM> correspond to the hall sensing components <NUM> and <NUM>, such that the first sensing magnets <NUM> and the second sensing magnets <NUM> can at least partially opposite to the hall sensing components <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrels <NUM>, thereby accurately sensing the positions of the first sensing magnet <NUM> and the second sensing magnet <NUM>, then obtaining the positions of the movable plastic lens barrels <NUM>, and thus calculating the displacements of the movable plastic lens barrels <NUM>.

Specifically, by a proper space configuration, flux density generated by the sensing magnet groups <NUM> along the direction in parallel with the optical axis OA can be referred to the chart in <FIG>. As shown in <FIG>, the flux density changes along the direction in parallel with the optical axis OA according to the positions of the magnetic poles of the first sensing magnets <NUM> and the second sensing magnets <NUM>, and an output voltage can be generated on the hall sensing component groups <NUM> from a release point to a working point of the flux density. The hall sensing component groups <NUM> can obtain the high potential H and the low potential L of the output voltage to deduce the position of each magnetic pole of the sensing magnet groups <NUM>, thereby timely obtaining the positions of the movable plastic lens barrels <NUM>. Note that the proper space configuration will be achieved by the following conditions.

When a shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> of each of the of the sensing magnet groups <NUM> is Dp, a longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> of each of the of the sensing magnet groups <NUM> is Dm, and the total quantity of the sensing magnets of each of the of the sensing magnet groups <NUM> is Nt, the following conditions are satisfied: Dp = <NUM> [mm]; Dm = <NUM> [mm]; Nt = <NUM>; and Nt×Dp/(Dm-(Nt-<NUM>)×Dp) = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> of each of the of the sensing magnet groups <NUM> is Dp, and the longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> of each of the of the sensing magnet groups <NUM> is Dm, the following condition is satisfied: Dp/Dm = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles among the first sensing magnet <NUM> and the second sensing magnet <NUM> of each of the of the sensing magnet groups <NUM> is Dp, and a shortest distance along the direction in parallel with the optical axis OA between the hall sensing components <NUM>, <NUM> and <NUM> of each of the hall sensing component groups <NUM> is Dh, the following condition is satisfied: Dh = <NUM> [mm]; and Dh/Dp = <NUM>.

Please refer to <FIG>, where <FIG> is a perspective view of the imaging lens module according to the 3rd embodiment of the present disclosure, <FIG> is a partially exploded view of the imaging lens module in <FIG>, <FIG> is an exploded view of the imaging lens module in <FIG>, <FIG> is another exploded view of the imaging lens module in <FIG>, <FIG> is a front view showing the configuration of a flexible printed circuit board, a driving coil group, a hall sensing component group and a sensing magnet group of the imaging lens module in <FIG>, <FIG> is a side view showing the configuration of the flexible printed circuit board, the driving coil group, the hall sensing component group and the sensing magnet group of the imaging lens module in <FIG>, and <FIG> is a chart showing flux density and output voltage corresponding to the configuration of the driving coil group, the hall sensing component group and the sensing magnet group in <FIG>.

This embodiment provides an imaging lens module <NUM> that includes a base <NUM>, a frame component <NUM>, a plurality of rollable supporters <NUM>, a movable imaging lens unit <NUM>, two fixed imaging lens units <NUM>, an optical folding component <NUM>, a sensing magnet group <NUM>, a flexible printed circuit board <NUM>, a driving coil group <NUM> and a hall sensing component group <NUM>.

The fixed imaging lens units <NUM> are immovably located in the accommodation space AS and respectively disposed at an object side and an image-side of the movable imaging lens unit <NUM>. The fixed imaging lens units <NUM> each include a fixed plastic lens barrel <NUM> and a fixed plastic lens element group <NUM> that is accommodated in the fixed plastic lens barrel <NUM>. Please be noted that each of the movable plastic lens element group <NUM> and the fixed plastic lens element groups <NUM> can include one or more lens elements, and the present disclosure is not limited thereto.

The optical folding component <NUM> is located in the accommodation space AS and disposed at an object side of the movable imaging lens unit <NUM> and the fixed imaging lens units <NUM>. The optical folding component <NUM> may be a reflection mirror or a prism that is able to fold an incident optical path IOP from outside into the fixed imaging lens units <NUM> and the movable imaging lens unit <NUM> so as to coincide with the optical axis OA.

Please refer to <FIG>, where <FIG> is a perspective view of the imaging lens module according to the 4th embodiment of the present disclosure, <FIG> is an exploded view of the imaging lens module in <FIG>, <FIG> is another exploded view of the imaging lens module in <FIG>, <FIG> is a front view showing the configuration of a flexible printed circuit board, a driving coil group, a hall sensing component group and a sensing magnet group of the imaging lens module in <FIG>, <FIG> is a side view showing the configuration of the flexible printed circuit board, the driving coil group, the hall sensing component group and the sensing magnet group of the imaging lens module in <FIG>, and <FIG> is a chart showing flux density and output voltage corresponding to the configuration of the driving coil group, the hall sensing component group and the sensing magnet group in <FIG>.

The sensing magnet group <NUM> is located in the accommodation space AS. Specifically, the sensing magnet group <NUM> includes a first sensing magnet <NUM>, a second sensing magnet <NUM> and a third sensing magnet <NUM> that are sequentially disposed on the movable plastic lens barrel <NUM> along a direction in parallel with the optical axis OA. The first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> are located at the same side with respect to a reference plane (not shown) that passes through the optical axis OA, and the reference plane has a normal direction perpendicular to the optical axis OA. That is, the optical axis OA is located on the reference plane. When the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> are observed from the direction in parallel with the optical axis OA, images of the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> are at least partially overlapped. Two adjacent magnetic poles of the first sensing magnet <NUM> and the second sensing magnet <NUM> are south poles between which there is a repulsive force. Two adjacent magnetic poles of the second sensing magnet <NUM> and the third sensing magnet <NUM> are north poles between which there is a repulsive force.

The driving coil group <NUM> is disposed on the flexible printed circuit board <NUM> along a direction in parallel with the optical axis OA. The driving coil group <NUM> includes six driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> that are opposite to the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> of the sensing magnet group <NUM>. The driving coil group <NUM> and the sensing magnet group <NUM> generate a Lorentz force by electromagnetic interaction therebetween that can be a magnetic driving force for moving the movable plastic lens barrel <NUM> along a direction in parallel with the optical axis OA. When the movable plastic lens barrel <NUM> is in its original position, the first sensing magnet <NUM> corresponds to three driving coils <NUM>, <NUM> and <NUM>, the second sensing magnet <NUM> corresponds to three driving coils <NUM>, <NUM> and <NUM>, and the third sensing magnet <NUM> corresponds to two driving coils <NUM> and <NUM>, such that the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> can at least partially opposite to the driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrel <NUM>, thereby ensuring a sufficient magnetic driving force can be continuously generated therebetween.

The hall sensing component group <NUM> includes six hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> that are sequentially soldered on the flexible printed circuit board <NUM> along a direction in parallel with the optical axis OA and may be respectively located at central positions of the driving coils <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, as shown in <FIG>. When the movable plastic lens barrel <NUM> is in its original position, the first sensing magnet <NUM> corresponds to two hall sensing components <NUM> and <NUM>, the second sensing magnet <NUM> corresponds to three hall sensing components <NUM>, <NUM> and <NUM>, and the third sensing magnet <NUM> corresponds to the other one hall sensing component <NUM>, such that the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> can at least partially opposite to the hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> after moving the movable plastic lens barrel <NUM>, thereby accurately sensing the positions of the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM>, then obtaining the position of the movable plastic lens barrel <NUM>, and thus calculating the displacement of the movable plastic lens barrel <NUM>.

Specifically, by a proper space configuration, flux density generated by the sensing magnet group <NUM> along the direction in parallel with the optical axis OA can be referred to the chart in <FIG>. As shown in <FIG>, the flux density changes along the direction in parallel with the optical axis OA according to the positions of the magnetic poles of the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM>, and an output voltage can be generated on the hall sensing component group <NUM> from a release point to a working point of the flux density. The hall sensing component group <NUM> can obtain the high potential H and the low potential L of the output voltage to deduce the position of each magnetic pole of the sensing magnet group <NUM>, thereby timely obtaining the position of the movable plastic lens barrel <NUM>. Note that the proper space configuration will be achieved by the following conditions.

When a shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles or two magnetic north poles among the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> is Dp, a longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> is Dm, and the total quantity of the sensing magnets of the sensing magnet group <NUM> is Nt, the following conditions are satisfied: Dp = <NUM> [mm]; Dm = <NUM> [mm]; Nt = <NUM>; and Nt×Dp/(Dm-(Nt-<NUM>)×Dp) = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles or two magnetic north poles among the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> is Dp, and the longest distance along the direction in parallel with the optical axis OA between two magnetic poles among the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> is Dm, the following condition is satisfied: Dp/Dm = <NUM>.

When the shortest distance along the direction in parallel with the optical axis OA between two magnetic south poles or two magnetic north poles among the first sensing magnet <NUM>, the second sensing magnet <NUM> and the third sensing magnet <NUM> is Dp, and a shortest distance along the direction in parallel with the optical axis OA between the hall sensing components <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is Dh, the following condition is satisfied: Dh = <NUM> [mm]; and Dh/Dp = <NUM>.

Please refer to <FIG>, where <FIG> is an exploded view of a camera module according to the 5th embodiment of the present disclosure, and <FIG> is another exploded view of the camera module in <FIG>.

This embodiment provides a camera module C5 that includes an imaging lens module <NUM> and an image sensor IS. The imaging lens module <NUM> may be similar to the imaging lens module <NUM> of the 3rd embodiment, and only differences between this and the above-mentioned embodiments will be described hereinafter. In addition, the camera module C5 may also include the imaging lens module of other embodiment, and the present disclosure is not limited thereto.

The imaging lens module <NUM> has an image surface (not shown), and the image surface IS is disposed on the image surface of the imaging lens module <NUM> so as to convert light passing through the imaging lens module <NUM> into an optical image signal.

The imaging lens module <NUM> further includes an optical image stabilizer 5a, an auxiliary sensing magnet group 5b, an auxiliary driving coil group 5c and an auxiliary hall sensing component group 5d. The optical image stabilizer 5a is disposed on the image sensor IS and is able to move the image sensor IS so as to stabilize the converted optical image signal on the image sensor IS. The auxiliary sensing magnet group 5b, the auxiliary driving coil group 5c and the auxiliary hall sensing component group 5d are disposed on the optical image stabilizer 5a to collaborate with one another to move the optical image stabilizer 5a, such that the image sensor IS is in a condition that can be driven so as to achieve an optical image stabilization function.

Please refer to <FIG> and <FIG>, wherein <FIG> is a perspective view of an electronic device according to the 6th embodiment of the present disclosure, and <FIG> is another perspective view of the electronic device in <FIG>.

In this embodiment, an electronic device <NUM> is a smartphone including a plurality of camera modules, a flash module <NUM>, a focus assist module <NUM>, an image signal processor <NUM>, a display module (user interface) <NUM> and an image software processor (not shown).

The camera modules include an ultra-wide-angle camera module 60a, a high pixel camera module 60b and a telephoto camera module 60c. The camera module C5 disclosed in the 5th embodiment is taken as the telephoto camera module 60c, but the present disclosure is not limited thereto.

The image captured by the ultra-wide-angle camera module 60a enjoys a feature of multiple imaged objects. <FIG> is an image captured by the ultra-wide-angle camera module 60a.

The image captured by the high pixel camera module 60b enjoys a feature of high resolution and less distortion, and the high pixel camera module 60b can capture part of the image in <FIG>. <FIG> is an image captured by the high pixel camera module 60b.

The image captured by the telephoto camera module 60c enjoys a feature of high optical magnification, and the telephoto camera module 60c can capture part of the image in <FIG>. <FIG> is an image captured by the telephoto camera module 60c. The maximum field of view (FOV) of the camera module C5 corresponds to the field of view in <FIG>.

When a user captures images of an object, the light rays converge in the ultra-wide-angle camera module 60a, the high pixel camera module 60b or the telephoto camera module 60c to generate images, and the flash module <NUM> is activated for light supplement. The focus assist module <NUM> detects the object distance of the imaged object to achieve fast auto focusing. The image signal processor <NUM> is configured to optimize the captured image to improve image quality and provided zooming function. The light beam emitted from the focus assist module <NUM> can be either conventional infrared or laser. The display module <NUM> can include a touch screen, and the user is able to interact with the display module <NUM> and the image software processor having multiple functions to capture images and complete image processing. Alternatively, the user may capture images via a physical button. The image processed by the image software processor can be displayed on the display module <NUM>.

Please refer to <FIG>, which is a perspective view of an electronic device according to the 7th embodiment of the present disclosure.

In this embodiment, an electronic device <NUM> is a smartphone including the camera module C5 disclosed in the 5th embodiment, a camera module 70a, a camera module 70b, a camera module 70c, a camera module 70d, a camera module 70e, a camera module 70f, a camera module <NUM>, a camera module <NUM>, a flash module <NUM>, an image signal processor, a display module and an image software processor (not shown). The camera module C5, the camera module 70a, the camera module 70b, the camera module 70c, the camera module 70d, the camera module 70e, the camera module 70f, the camera module <NUM> and the camera module <NUM> are disposed on the same side of the electronic device <NUM>, while the display module is disposed on the opposite side of the electronic device <NUM>.

The camera module C5 is a telephoto camera module, the camera module 70a is a telephoto camera module, the camera module 70b is a telephoto camera module, the camera module 70c is a telephoto camera module, the camera module 70d is a wide-angle camera module, the camera module 70e is a wide-angle camera module, the camera module 70f is an ultra-wide-angle camera module, the camera module <NUM> is an ultra-wide-angle camera module, and the camera module <NUM> is a ToF (time of flight) camera module. In this embodiment, the camera module C5, the camera module 70a, the camera module 70b, the camera module 70c, the camera module 70d, the camera module 70e, the camera module 70f and the camera module <NUM> have different fields of view, such that the electronic device <NUM> can have various magnification ratios so as to meet the requirement of optical zoom functionality. In addition, the camera module C5 and the camera module 70a are telephoto camera modules having the optical folding component configuration. In addition, the camera module <NUM> can determine depth information of the imaged object. In this embodiment, the electronic device <NUM> includes a plurality of camera modules <NUM>, 70a, 70b, 70c, 70d, 70e, 70f, <NUM>, and <NUM>, but the present disclosure is not limited to the number and arrangement of camera module. When a user captures images of an object, the light rays converge in the camera modules C5, 70a, 70b, 70c, 70d, 70e, 70f, <NUM> or <NUM> to generate an image(s), and the flash module <NUM> is activated for light supplement. Further, the subsequent processes are performed in a manner similar to the abovementioned embodiments, so the details in this regard will not be provided again.

The smartphones in the embodiments are only exemplary for showing the image capturing unit and the camera module of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The image capturing unit and the camera module can be optionally applied to optical systems with a movable focus. Furthermore, the image capturing unit and the camera module feature good capability in aberration corrections and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle backup cameras, multi-camera devices, image recognition systems, motion sensing input devices, wearable devices and other electronic imaging devices.

Claim 1:
An imaging lens module (<NUM>), comprising:
at least one imaging lens unit (<NUM>), comprising at least one plastic lens barrel (<NUM>) and at least one plastic lens element group (<NUM>) and having an optical axis (OA), wherein the at least one plastic lens element group (<NUM>) is accommodated in the at least one plastic lens barrel (<NUM>), and the optical axis (OA) passes through the at least one plastic lens element group (<NUM>);
an optical folding component (<NUM>), configured to fold an incident optical path (IOP) into the at least one imaging lens unit (<NUM>) to coincide with the optical axis (OA); and
a sensing magnet group (<NUM>), comprising at least two sensing magnets (<NUM>, <NUM>) that are sequentially disposed on the at least one plastic lens barrel (<NUM>) along a direction in parallel with the optical axis (OA);
wherein the at least two sensing magnets (<NUM>, <NUM>) are located at a same side with respect to a reference plane that passes through the optical axis (OA), and the reference plane has a normal direction perpendicular to the optical axis (OA);
wherein when the at least two sensing magnets (<NUM>, <NUM>) are observed from the direction in parallel with the optical axis (OA), images of the at least two sensing magnets (<NUM>, <NUM>) are at least partially overlapped;
wherein two adjacent magnetic poles of the at least two sensing magnets (<NUM>, <NUM>) are like poles between which there is a repulsive force;
wherein a shortest distance along the direction in parallel with the optical axis (OA) between two magnetic like poles among the at least two sensing magnets (<NUM>, <NUM>) is Dp, a longest distance along the direction in parallel with the optical axis (OA) between two magnetic poles among the at least two sensing magnets (<NUM>, <NUM>) is Dm, a total quantity of the at least two sensing magnets (<NUM>, <NUM>) is Nt, and the following condition is satisfied: <MAT>