Folded zoom OIS circuit and camera device having the same

Abstract

A folded zoom optical image stabilization (OIS) circuit for driving a prism and a prism actuator includes: a posture recognition unit configured to recognize a shell posture based on an acceleration sensor value received from an acceleration sensor when an OIS off command is input, and output shell posture information; a prism position control unit configured to control a gradual position movement of the prism to a corresponding target position matching the shell posture information received from the posture recognition unit; and a prism driving unit configured to move the prism to a target position under the control of the prism position control unit.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2021-0011623 filed on January 27, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to a folded zoom type optical image stabilization (OIS) circuit and a camera device having the same. Background Art

[0004] Recently, high-end smartphones have been equipped with a folded zoom camera module to improve the quality of high-magnification zoom photos. Unlike an existing lens shift type camera module having lenses arranged in a vertical form, the folded zoom camera module has a structure that increases the focal length by refracting light at a right angle like a periscope. In order to refract light at a right angle, a prism capable of achieving optical image stabilization (OIS) is included.

[0005] Compared with the existing lens shift camera module, the folded zoom camera module has the advantages that it has a wider correction angle and can achieve a wide range of image stabilization, and since it performs image stabilization according to the rotation angle of the prism, even if the focal length increases, there is no loss of the maximum correction angle, so OIS control is easy, especially in high magnification zoom.

[0006] However, a problem with conventional cameras to which folded zoom OIS is applied is that when a camera app on a mobile device is closed after taking a picture, collision noise may be generated by the prism.

[0007] In addition, there are also causes such as attractive magnetic fields between the OIS pulling magnet and the yoke.

[0008] For example, when the wide-angle and telephoto lenses are continuously switched while the zoom magnification is changed in a camera app, there is a problem that continuous noise (sound) occurs when OIS on / off is repeated.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0010] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0011] In a general aspect, a folded zoom optical image stabilization (OIS) circuit for driving a prism and a prism actuator includes: a posture recognition unit configured to recognize a shell posture based on an acceleration sensor value received from an acceleration sensor when an OIS off command is input, and output shell posture information; a prism position control unit configured to control a gradual position movement of the prism to a corresponding target position matching the shell posture information received from the posture recognition unit; and a prism driving unit configured to move the prism to the target position under the control of the prism position control unit.

[0012] The posture recognition unit may be configured to output a recognition completion signal when outputting the casing posture information.

[0013] The prism position control unit may include: a timer, configured to start time counting when a recognition completion signal is input from a posture recognition unit; a memory, configured to output a corresponding target position matching the shell posture information; and a target change limiter, configured to generate a gradually increasing control value during a first time period based on the time count value of the timer to control the gradual position movement of the prism to the corresponding target position.

[0014] The prism driving unit may be configured to control a gradual position movement of the prism to a corresponding target position based on a control value of the prism position control unit, and gradually reduce a driving value of the prism when the prism reaches the corresponding target position.

[0015] The prism driving unit may include: a proportional-integral-differential (PID) control unit, configured to generate a control signal for controlling a gradual position movement of the prism to a corresponding target position based on a control value and a feedback value of a prism position control unit during a first time period; a PID output limiting unit, configured to output a control signal from the PID control unit during the first time period, and gradually reduce the amplitude of the control signal from the PID control unit during a second time period after the first time period; and a driving unit, configured to generate a driving current based on the control signal from the PID output limiting unit, and output the driving current to the prism actuator.

[0016] The PID control unit may include: an analog-to-digital (AD) converter configured to convert a position sensor signal of the prism into a digital feedback value, a first operator configured to operate the feedback value from the AD converter and a control value of the prism position control unit to output an error value; and a PID controller configured to generate a control signal for gradual position movement of the prism to a corresponding target position based on the error value from the first operator.

[0017] The PID output limiting unit may include: a PID output limiter configured to generate a maximum output ratio value during a first time period and to generate a gradually decreasing output ratio value to limit the control signal during a second time period after the first time period; and a second operator configured to generate a control signal with an output ratio value adjusted by multiplying a control signal from the PID control unit by the output ratio value from the PID output limiter.

[0018] In another general aspect, a folded zoom camera device includes: a prism actuator configured to move the position of a prism; a camera app unit configured to output an optical image stabilization (OIS) off command when a running camera app is terminated; an acceleration sensor configured to sense a housing posture of the folded zoom camera device to output an acceleration sensor value; an OIS circuit configured to control a gradual positional movement of the prism to a target position for each housing posture corresponding to the acceleration sensor value while checking the position of the prism by operating the prism actuator when an OIS off command is input; and a position sensor configured to sense the position of the prism to output a position sensor signal to the OIS circuit.

[0019] The OIS circuit may include: a posture recognition unit, configured to recognize the shell posture based on the acceleration sensor value from the acceleration sensor when the OIS off command is input from the camera app unit, and output shell posture information; a prism position control unit, configured to control the gradual position movement of the prism to a corresponding target position matching the shell posture information received from the posture recognition unit; and a prism driving unit, configured to gradually move the prism to the target position according to the control of the prism position control unit.

[0020] The prism driving unit may be configured to control a gradual position movement of the prism to a corresponding target position based on a control value of the prism position control unit, and gradually reduce a driving value of the prism when the prism reaches the corresponding target position.

[0021] The folded zoom camera device may further include: a camera controller configured to operate an internal timer when an OIS off command is input and control power stop of the OIS circuit when power is stopped; and a power supply device configured to stop power when there is a power stop control from the camera controller while power is supplied to the OIS circuit.

[0022] In another general aspect, an optical image stabilization (OIS) circuit for driving a prism includes a gesture recognition unit configured to determine a gesture when an OIS off command is input, and to output a target position in response to the gesture; and a prism driving unit configured to gradually move the prism to a target position.

[0023] The OIS circuit may further include a prism position control unit configured to control the prism driving unit to control gradual movement of the prism to a target position matching the posture determination.

[0024] The camera device may include an OIS circuit and a camera app unit configured to output an OIS off command when a running camera app is terminated.

[0025] The camera device may also include: a prism actuator configured to receive a driving signal from a prism driving unit to move the position of the prism; an acceleration sensor configured to sense a posture and output an acceleration sensor value, wherein the posture recognition unit is configured to determine the posture based on the acceleration sensor value; and a position sensor configured to sense the position of the prism and output the position sensor signal to the prism driving unit as feedback control.

[0026] Other features and aspects will become apparent from the appended claims, the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an exemplary diagram of an OIS circuit according to an embodiment of the present disclosure.

[0028] Figure 2 is an exemplary diagram of a camera device according to an embodiment of the present disclosure.

[0029] Figure 3 It is an explanatory diagram of the operation of the gesture recognition unit.

[0030] Figure 4 is an explanatory view of a sensing attitude of an acceleration sensor.

[0031] Figure 5 : is a diagram showing a relationship table among acceleration sensor values, housing postures, and target positions.

[0032] Figure 6 is an illustrative view of the shell posture.

[0033] Figure 7 This is an example diagram of a prism position control unit.

[0034] Figure 8 is an illustrative view of the target position according to the shell posture.

[0035] Fig. 9 is an example diagram of the control value output from the target change limiter.

[0036] Fig.10 is an example view of a prism drive unit.

[0037] Fig.11 This is a diagram showing an example of the output ratio value output from the PID output limiter.

[0038] Fig.12 is an example diagram of a camera controller and power supply device.

[0039] Fig.13 is a timing diagram of the main signals of the camera device.

[0040] 14(A)-(F) are explanatory views of noise measurement results according to target position control results for each housing posture.

[0041] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0042] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0043] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described in this application. However, various changes, modifications and equivalents of the methods, devices and / or systems described in this application will be apparent after understanding the present disclosure. For example, the order of operations described in this application is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth in this application, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0044] The features described in this application can be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application that will be apparent after understanding this disclosure.

[0045] It should be noted that in the present application, the use of the word "may" with respect to embodiments or examples, for example, regarding what an embodiment or example may include or implement, means that there is at least one embodiment or example that includes or implements such features, and all examples and embodiments are not limited thereto.

[0046] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0047] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0048] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0049] Spatially relative terms such as "above", "higher", "below", "lower", etc. may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0050] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to also include plural forms. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or their combinations, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or their combinations.

[0051] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0052] The features of the examples described in this application may be combined in various ways that will be apparent after gaining an understanding of the present disclosure. In addition, although the examples described in this application have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0053] One aspect of the present invention is to provide a folded zoom optical image stabilization (OIS) circuit in a folded zoom camera device and a camera device having the circuit, which is capable of reducing noise caused by contact (or collision) between a prism and a housing when a camera app is turned off (or OIS is turned off).

[0054] Figure 1 is an exemplary diagram of an OIS circuit according to an embodiment of the present disclosure, and Figure 2 is an exemplary diagram of a camera device according to an embodiment of the present disclosure.

[0055] Reference Figure 1 , the OIS circuit 200 according to an embodiment of the present disclosure may be a folded zoom type OIS circuit that drives the prism 301 and the prism actuator 300 .

[0056] The OIS circuit 200 may include a gesture recognition unit 210 , a prism position control unit 230 , and a prism driving unit 250 .

[0057] Reference Figure 2 , the camera device 10 according to an embodiment of the present disclosure may be a folding zoom type camera device.

[0058] The camera device 10 may include a prism 301 , a prism actuator 300 , a camera app unit 110 , an acceleration sensor 130 , an OIS circuit 200 , and a position sensor 400 .

[0059] The prism 301 can be arranged in the accommodation space of the prism housing ( Figure 6302), is moved by the prism actuator 300 and reflects light for imaging.

[0060] The prism actuator 300 may be operated by the OIS circuit 200 through a driving signal.

[0061] For example, the prism actuator 300 may be a voice coil motor (VCM) actuator. In this case, the prism actuator 300 may include a magnet disposed on the prism 301 and a driving coil disposed on the housing of the prism, and the driving coil transmits a driving force to the magnet of the prism 301 through an electromagnetic force to move the position of the prism 301. Since the example of the prism actuator 300 is only an example, it is not limited thereto.

[0062] When the running camera app is terminated, the camera app unit 110 may output an OIS off command (C_OIS_OFF) to the OIS circuit 200 .

[0063] The acceleration sensor 130 may sense the housing posture of the folded-zoom camera apparatus 10 and output an acceleration sensor value Vas to the OIS circuit 200 .

[0064] When the OIS off command (C_OIS_OFF) is input, the OIS circuit 200 can control the prism to gradually move to the target position of each shell posture corresponding to the acceleration sensor value Vas based on the position sensor signal SP and use the driving signal Sdr, while checking the position of the prism based on the position sensor signal SP.

[0065] The position sensor 400 may sense the position of the prism 301 and output a position sensor signal SP to the OIS circuit 200 .

[0066] like Figure 1 As shown, Figure 2 The illustrated OIS circuit 200 may include a gesture recognition unit 210 , a prism position control unit 230 , and a prism driving unit 250 .

[0067] Reference Figure 1 and Figure 2 , when the OIS off command (C_OIS_OFF) is input, the posture recognition unit 210 may recognize the housing posture based on the acceleration sensor value Vas received from the acceleration sensor 130 and output housing posture information (INFO_ATT).

[0068] The prism position control unit 230 may control the gradual position movement of the prism 301 to a corresponding target position matched with the casing posture information (INFO_ATT) received from the posture recognition unit 210 by using the control value CV.

[0069] The prism driving unit 250 may generate a driving signal Sdr using the control value CV received from the prism position control unit 230 , and move the prism 301 to the target position TP using the driving signal Sdr.

[0070] For each drawing of the present disclosure, unnecessary redundant description of the same reference numerals and components having the same function may be omitted, and possible differences may be described with respect to each drawing.

[0071] Figure 3 It is an explanatory diagram of the operation of the gesture recognition unit.

[0072] Reference Figure 3 As described above, the gesture recognition unit 210 may output the housing gesture information (INFO_ATT), and further, when recognizing the housing gesture, output the recognition completion signal Src.

[0073] Figure 4 The following is a diagram for explaining the sensing posture of the acceleration sensor.

[0074] Reference Figure 4 In the case of a 3-axis (X-axis, Y-axis, Z-axis) sensor, the acceleration sensor 130 can sense two directions of each of the three axes, thereby sensing acceleration in all six directions. Therefore, the acceleration sensor value Vas can be output.

[0075] For example, in the case of a 3-axis sensor having an X-axis, a Y-axis, and a Z-axis, the six directions may be a first direction (#1) (+Acc_z) (facing upward direction) and a second direction (#2) (-Acc_z) (facing downward direction) relative to the Z-axis direction, and a third direction (#3) (-Acc_x) (12 o'clock direction), a fourth direction (#4) (+Acc_y) (3 o'clock direction), a fifth direction (#5) (+Acc_x) (6 o'clock direction), and a sixth direction (#6) (-Acc_y) (9 o'clock direction) relative to the X-axis and Y-axis directions.

[0076] For example, the X-axis may be the longitudinal direction of the acceleration sensor 130, the Y-axis may be the width direction of the acceleration sensor 130, and the Z-axis may be the thickness direction of the acceleration sensor 130 ( Figure 4 up and down directions in the image).

[0077] Figure 5 : is a diagram showing a relationship table among acceleration sensor values, housing postures, and target positions.

[0078] Reference Figure 5Examples of the acceleration sensor value Vas may be positive Z (+Z), negative Z (-Z), negative X (-X), positive Y (+Y), and positive X (+X) and negative Y (-Y).

[0079] For example, each of the positive Z (+Z), negative Z (-Z), negative X (-X), positive Y (+Y), positive X (+X) and negative Y (-Y) as the acceleration sensor value Vas can be the acceleration sensor value of the first direction (#1) (facing upward direction), the second direction (#2) (facing downward direction) and the third direction (#3) (prism upward direction) (12 o'clock direction), the fourth direction (#4) (prism right direction) (3 o'clock direction) and the fifth direction (#5) (prism downward direction) (6 o'clock direction) and the sixth direction (#6) (prism left direction) (9 o'clock direction) relative to the six postures of the shell.

[0080] For each of the acceleration sensor values ​​Vas in the above six directions, the corresponding target position TP can be set according to the corresponding housing posture as follows.

[0081] (1) With respect to the first direction (#1) (facing upward), the X-axis can be set to "Hall Max", and the Y-axis can be set to "Hall Min". (2) With respect to the second direction (#2) (facing downward), the X-axis can be set to "Hall Max", and the Y-axis can be set to "Hall Max". (3) For the third direction (#3) (prism upward direction) (12 o'clock direction), the X-axis can be set to "Hall Max", and the Y-axis can be set to "Hall Min". (4) With respect to the fourth direction (#4) (prism rightward direction) (3 o'clock direction), the X-axis can be set to "Hall Min", and the Y-axis can be set to "Hall Min". (5) With respect to the fifth direction (#5) (prism downward direction) (6 o'clock direction), the X-axis can be set to "Hall Max", and the Y-axis can be set to "Hall Min". (6) With respect to the sixth direction (#6) (prism leftward direction) (9 o'clock direction), the X-axis can be set to "Hall Max", and the Y-axis can be set to "Hall Min".

[0082] Figure 6 is an illustrative view of the shell posture.

[0083] Reference Figure 6 , six directions regarding the posture of the shell will be described below.

[0084] The first direction (#1) (facing upward direction) is a direction in which the shooting direction of the camera device 10 faces upward. The second direction (#2) (facing downward direction) is a direction in which the shooting direction faces downward. The third direction (#3) (prism upward direction) (12 o'clock direction) is a direction in which the shooting direction points to one side and the prism 301 is located above the storage space 302. The fourth direction (#4) (prism rightward direction) (3 o'clock direction) is a direction in which the shooting direction points to one side and the prism 301 is located on the right side of the storage space 302. The fifth direction (#5) (prism downward direction) (6 o'clock direction) is a direction in which the shooting direction points to one side and the prism 301 is located below the storage space 302. The sixth direction (#6) (prism leftward direction) (9 o'clock direction) is a direction in which the shooting direction points to one side and the prism 301 is located on the left side of the storage space 302.

[0085] Figure 7 This is an example diagram of a prism position control unit.

[0086] Reference Figure 7 , the prism position control unit 230 may include a timer 231 , a memory 233 , and a target change limiter 235 .

[0087] When the recognition completion signal Src is input from the gesture recognition unit 210 , the timer 231 may start counting time and provide the time count value to the target change limiter 235 and the prism driving unit 250 .

[0088] The memory 233 may output the corresponding target position TP that matches the shell attitude information (INFO_ATT). Figure 5 As described, the memory 233 stores the target position TP matched with each posture of the casing.

[0089] The target change limiter 235 may generate a gradually increasing control value CV during the first period TP1 based on the time count value of the timer 231 to control a gradual position movement of the prism 301 to the corresponding target position TP, thereby outputting the control value CV to the prism driving unit 250 .

[0090] For example, “gradual position movement” does not mean an immediate sudden movement, but means moving from the initial position to the target position TP at a constant speed during the first period TP1 so as to reduce collision (contact) noise between the prism 301 and the housing.

[0091] Figure 8 This is a diagram for explaining the target position according to the housing posture.

[0092] exist Figure 8In the figure, relative to the shell posture of the above-mentioned six camera devices, the X-axis can be the longitudinal direction of the accommodating space 302 accommodating the prism 301, and the Y-axis can be the thickness direction of the electronic device (e.g., a phone) to which the camera device is applied.

[0093] Reference Figure 8 The target position TP may be a position to be moved to reduce the collision (contact) noise between the prism 301 and the housing, and may be based on the reference Figure 5 The direction of the housing posture described is set as follows.

[0094] (1) In the case of the first direction (#1), as the target position, the X-axis can be "Hall Max", and the Y-axis can be "Hall Min". (2) In the case of the second direction (#2), the X-axis can be "Hall Max", and the Y-axis can be "Hall Max". (3) In the case of the third direction (#3), the X-axis can be "Hall Max", and the Y-axis can be "Hall Min". (4) In the case of the fourth direction (#4), the X-axis can be "Hall Min", and the Y-axis can be "Hall Min". (5) In the case of the fifth direction (#5), the X-axis can be "Hall Max", and the Y-axis can be "Hall Min". (6) In the case of the sixth direction (#6), the X-axis can be "Hall Max", and the Y-axis can be "Hall Min".

[0095] Fig. 9 is an example diagram of the control value output from the target change limiter.

[0096] Reference Fig. 9 In order to reduce the collision (contact) noise between the prism and the shell, in order to gradually move the prism from the initial position to the target position TP in a first time period TP1 (for example, 0 milliseconds to 120 milliseconds), the control value CV output from the target change limiter 235 can be a linearly increasing value.

[0097] For example, when the target position TP is 100%, the rising slope (Δy / Δx) of the control value CV for moving the control value CV from the initial position to the target position TP may be 0.83% / ms. Since this is merely an example, the present disclosure is not limited thereto.

[0098] Fig.10 is an example view of a prism drive unit.

[0099] Reference Fig.10The prism driving unit 250 may control the gradual position movement of the prism 301 to the corresponding target position TP based on the control value CV of the prism position control unit 230, and when the prism 301 reaches the corresponding target position TP, the driving value of the prism 301 may be gradually reduced.

[0100] For example, the prism driving unit 250 may include a proportional-integral-derivative (PID) control unit 251 , a PID output limiting unit 253 , and a driving unit 255 .

[0101] The PID control unit 251 may generate a control signal SC for controlling a gradual position movement of the prism 301 to a corresponding target position TP based on the control value CV and the feedback value FV of the prism position control unit 230 during the first period TP1.

[0102] The PID output limiting unit 253 may output the control signal SC from the PID control unit 251 during the first period TP1 , and gradually reduce the amplitude of the control signal SC from the PID control unit 251 during the second period TP2 after the first period TP1 .

[0103] The driving unit 255 may generate a driving current based on the control signal from the PID output limiting unit 253 and output it to the prism actuator 300 .

[0104] For example, the PID control unit 251 may include an analog-to-digital (AD) converter 251 - 1 , a first operator 251 - 3 , and a PID controller 251 - 5 .

[0105] The AD converter 251 - 1 may convert the position sensor signal SP of the prism 301 into a digital feedback value FV.

[0106] The first operator 251 - 3 may operate the feedback value FV from the AD converter 251 - 1 and the control value CV of the prism position control unit 230 to output an error value EV.

[0107] The PID controller 251 - 5 may generate a control signal for gradual position movement of the prism 301 to a corresponding target position TP based on the error value EV from the first operator 251 - 3 .

[0108] For example, the PID output limiting unit 253 may include a PID output limiter 253 - 1 and a second operator 253 - 3 .

[0109] The PID output limiter 253 - 1 may generate a highest output ratio value ORV (eg, 100%) during a first period TP1 , and generate an output ratio value ORV gradually decreasing to limit the control signal SC during a second period TP2 after the first period TP1 .

[0110] The second operator 253 - 3 may multiply the control signal SC from the PID control unit 251 by the output ratio value ORV from the PID output limiter 253 - 1 to generate a control signal SC′ whose output ratio is adjusted.

[0111] Fig.11 This is a diagram showing an example of the output ratio value output from the PID output limiter.

[0112] Reference Fig.11 It can be seen that during the second time period TP2 (eg, 120 ms to 620 ms) after the first time period TP1, the output ratio value ORV output from the PID output limiter 253-1 decreases linearly from 100% to 0%.

[0113] Fig.12 is an example diagram of a camera controller and power supply device.

[0114] Reference Fig.12 , the folded-zoom camera device 10 may further include a camera controller 150 and a power device 170 .

[0115] When the OIS off command (C_OIS_OFF) is input, the camera controller 150 may operate an internal timer to control the stop of the power supply of the OIS circuit when there is a power stop time T3.

[0116] When there is a power stop control signal PWR from the camera controller 150 while power is being supplied to the OIS circuit 200 , the power supply device 170 may stop supplying power.

[0117] Fig.13 is a timing diagram of the main signals of the camera device.

[0118] exist Fig.13 , C_OIS_OFF is an OIS off command output by the camera app unit 110 to the OIS circuit 200 when the running camera app is terminated. CV is a control value output from the target change limiter 235 to the prism driving unit 250. SC' is a control signal obtained by multiplying the control signal SC from the PID control unit 251 by the output ratio value ORV from the PID output limiter 253-1, and its output ratio is adjusted by the second operator 253-3. PWR is a power stop control signal provided by the power supply device 170 to the OIS circuit 200.

[0119] In addition, Fig.13 In the embodiment, the first time period TP1 is a time period set based on a time point of recognizing the posture of the casing, and may be a period of, for example, 0 milliseconds to 120 milliseconds.

[0120] The second period TP2 is a period set based on the time point at which the posture of the casing is recognized, and may be a cycle of, for example, 120 milliseconds to 620 milliseconds.

[0121] The power stop time T3 may be set to be synchronized with the end time of the second period TP2.

[0122] 14(A)-(F) are explanatory views of noise measurement results according to target position control results for each housing posture.

[0123] Figures 14(A), 14(B), 14(C), 14(D), 14(E) and 14(F) are views showing simulation results for a case where the prism is gradually moved to a target position TP (a target position in the Y-axis direction and a target position in the X-axis direction) that matches each of the above-mentioned six shell postures.

[0124] 14(A) to 14(F), it can be seen that since the prism gradually moves to the target position matching each of the six housing postures, no noise is generated.

[0125] As described above, according to the embodiments of the present disclosure, in the folded zoom camera device, when the camera app is terminated (when the OIS is turned off), noise caused by contact (or collision) between the prism and the housing can be reduced.

[0126] Although specific examples have been shown and described above, it will be apparent after gaining an understanding of the present disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application should be understood in a descriptive sense only, and not for limiting purposes. The description of the features or aspects in each example should be understood to be applicable to similar features or aspects in other examples. If the described techniques are implemented in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. A folded zoom optical image stabilization circuit for driving a prism and a prism actuator, comprising: a posture recognition unit configured to recognize the posture of the housing based on the acceleration sensor value received from the acceleration sensor when an optical image stabilization off command is received, and output housing posture information; a prism position control unit configured to control a gradual position movement of the prism to a corresponding target position in an optical image stabilization off state, the corresponding target position being determined based on the housing posture information received from the posture recognition unit; as well as The prism driving unit is configured to move the prism to a target position under the control of the prism position control unit when the optical image stabilization is turned off.

2. The folded zoom optical image stabilization circuit according to claim 1, wherein: The posture recognition unit is configured to output a recognition completion signal when outputting the housing posture information.

3. The folded zoom optical image stabilization circuit according to claim 1, wherein: The prism position control unit comprises: a timer configured to start time counting when a recognition completion signal is input from the gesture recognition unit; a memory configured to output the corresponding target position matched with the shell posture information; and A target change limiter is configured to generate a gradually increasing control value during a first time period based on a time count value of the timer to control the gradual position movement of the prism to the corresponding target position.

4. The folded zoom optical image stabilization circuit according to claim 1, wherein: The prism driving unit is configured to control the gradual position movement of the prism to the corresponding target position based on the control value of the prism position control unit, and when the prism reaches the corresponding target position, the prism driving unit is configured to gradually reduce the driving value of the prism.

5. The folded zoom optical image stabilization circuit according to claim 1, wherein: The prism driving unit comprises: a PID control unit configured to generate a control signal for controlling the gradual position movement of the prism to the corresponding target position based on the control value and the feedback value of the prism position control unit during a first time period; a PID output limiting unit configured to output the control signal from the PID control unit during the first time period and gradually reduce the amplitude of the control signal from the PID control unit during a second time period after the first time period; and A driving unit configured to generate a driving current based on the control signal from the PID output limiting unit and output the driving current to the prism actuator.

6. The folded zoom optical image stabilization circuit according to claim 5, wherein: The PID control unit comprises: An AD converter configured to convert a position sensor signal of the prism into a digital feedback value; a first operator configured to operate the digital feedback value from the AD converter and the control value of the prism position control unit to output an error value; and A PID controller is configured to generate the control signal for the gradual position movement of the prism to the corresponding target position based on the error value from the first operator.

7. The folded zoom optical image stabilization circuit according to claim 5, wherein: The PID output limiting unit comprises: a PID output limiter configured to generate a maximum output ratio value during the first time period and to generate a gradually decreasing output ratio value during a second time period after the first time period to limit the control signal; and A second operator is configured to generate a control signal whose output ratio value is adjusted by multiplying the control signal from the PID control unit by the output ratio value from the PID output limiter.

8. Folding zoom camera equipment, including: a prism actuator configured to move the position of the prism; a camera app unit configured to output an optical image stabilization off command when the running camera app is terminated; an acceleration sensor configured to sense a housing posture of the folded zoom camera device in an optical image stabilization off state to output an acceleration sensor value; an optical image stabilization circuit configured to, when receiving the optical image stabilization off command, control a gradual positional movement of the prism to a target position determined based on each housing posture corresponding to the acceleration sensor value while checking the position of the prism by operating the prism actuator; as well as A position sensor is configured to sense the position of the prism to output a position sensor signal to the optical image stabilization circuit.

9. The folded zoom camera device of claim 8, wherein: The optical image stabilization circuit comprises: a gesture recognition unit configured to recognize the housing gesture based on the acceleration sensor value from the acceleration sensor and output housing gesture information when the optical image stabilization off command is received from the camera app unit; a prism position control unit configured to control the gradual position movement of the prism to a corresponding target position determined based on the housing posture information received from the posture recognition unit in a state where the optical image stabilization is turned off; and The prism driving unit is configured to gradually move the prism to the target position according to the control of the prism position control unit when the optical image stabilization is turned off.

10. The folded zoom camera device of claim 9, wherein: The posture recognition unit is configured to output a recognition completion signal when outputting the housing posture information.

11. The folded zoom camera device of claim 9, wherein: The prism position control unit comprises: a timer configured to start time counting when receiving a recognition completion signal from the gesture recognition unit; a memory configured to output the corresponding target position matched with the shell posture information; and A target change limiter is configured to generate a gradually increasing control value during a first time period based on a time count value of the timer to control the gradual position movement of the prism to the corresponding target position.

12. The folded zoom camera device of claim 9, wherein: The prism driving unit is configured to control the gradual position movement of the prism to the corresponding target position based on the control value of the prism position control unit, and gradually reduce the driving value of the prism when the prism reaches the corresponding target position.

13. The folded zoom camera device of claim 9, wherein: The prism driving unit comprises: a PID control unit configured to generate a control signal for controlling the gradual position movement of the prism to the corresponding target position based on the control value and the feedback value of the prism position control unit during a first time period; a PID output limiting unit configured to output the control signal from the PID control unit during the first time period and gradually reduce the amplitude of the control signal from the PID control unit during a second time period after the first time period; and A driving unit configured to generate a driving current based on the control signal from the PID output limiting unit and output the driving current to the prism actuator.

14. The folded zoom camera device of claim 13, wherein: The PID control unit comprises: an AD converter configured to convert the position sensor signal of the prism into a digital feedback value; a first operator configured to operate the digital feedback value from the AD converter and the control value of the prism position control unit to output an error value; and A PID controller is configured to generate the control signal for the gradual position movement of the prism to the corresponding target position based on the error value from the first operator.

15. The folded zoom camera device of claim 13, wherein: The PID output limiting unit comprises: a PID output limiter configured to generate a maximum output ratio value during the first time period and to generate a gradually decreasing output ratio value after the first time period to limit the control signal during the second time period; and A second operator is configured to generate a control signal whose output ratio value is adjusted by multiplying the control signal from the PID control unit by the output ratio value from the PID output limiter.

16. The folded zoom camera device of claim 8, further comprising: a camera controller configured to operate an internal timer when the optical image stabilization off command is input, and control power supply stop of the optical image stabilization circuit when power is stopped; as well as A power supply device is configured to stop power supply when there is a power stop control from the camera controller while power is being supplied to the optical image stabilization circuit.

17. An optical image stabilization (OIS) circuit for driving a prism, comprising: a gesture recognition unit configured to determine a gesture when an optical image stabilization off command is received, and output a target position based on the determined gesture; as well as The prism driving unit is configured to gradually move the prism to the target position when the optical image stabilization is turned off.

18. The optical image stabilization circuit according to claim 17, further comprising a prism position control unit configured to control the prism driving unit to control the gradual movement of the prism to the target position matching the posture determination.

19. Camera equipment, including: The optical image stabilization circuit according to claim 17; as well as The camera app unit is configured to output the optical image stabilization off command when the running camera app is terminated.

20. The camera device of claim 19, further comprising: a prism actuator configured to receive a driving signal from the prism driving unit to move the position of the prism; an acceleration sensor configured to sense the posture and output an acceleration sensor value, wherein the posture recognition unit is configured to determine the posture based on the acceleration sensor value; as well as A position sensor is configured to sense the position of the prism and output a position sensor signal to the prism driving unit as feedback control.

Images