KR101480166B1

KR101480166B1 - Camera module

Info

Publication number: KR101480166B1
Application number: KR20120155250A
Authority: KR
Inventors: 서경열
Original assignee: 태하메카트로닉스 (주)
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2015-01-08
Also published as: KR20140085077A

Abstract

A camera module is disclosed in the present invention. The camera module includes a housing fixed to one side of a heavy equipment vehicle, a gyro sensor fixed to the inside of the housing to detect a rotational speed of the heavy equipment vehicle, An actuator for varying a tilting angle of the imaging block, and an actuator for controlling the tilting angle of the head block according to the rotational speed of the vehicle outputted from the gyro sensor, And a digital signal processor.
According to the present invention, there is provided a camera module capable of adaptively extending a rear surveillance region in accordance with the rotational speed of a heavy equipment vehicle.

Description

Camera module {Camera module}

The present invention relates to a camera module.

In addition to the driving mode, heavy-duty vehicles such as excavators can operate in a swing mode that swivels 360 degrees from the ground. Therefore, it is necessary to visually confirm the presence of persons or objects within the working radius, . Especially, by expanding the rear surveillance area adaptively to the current revolving speed rather than the revolving state of the excavator, that is, the rotation angle of the excavator, it is necessary for the operator of the equipment to have a safety means capable of ensuring a sufficient time margin for the operation.

An embodiment of the present invention provides a camera module capable of adaptively extending a rear surveillance region in accordance with the rotational speed of a heavy equipment vehicle.

In order to achieve the above object and other objects, a camera module of the present invention comprises:

A camera module for capturing a rear image of a heavy equipment vehicle,

A housing fixed to one side of the heavy equipment vehicle;

A gyro sensor fixed inside the housing for detecting a rotational speed of the heavy equipment vehicle;

An imaging block supported by a pivot shaft provided so as to be tiltable with respect to the housing;

An actuator for varying a tilting angle of the imaging block; And

And a digital signal processor for controlling the actuator and adjusting a tilting angle of the head block according to the rotational speed of the vehicle output from the gyro sensor.

For example, the imaging block may include:

An optical unit including at least one lens for imaging an object image with respect to an imaging surface; And

And an imaging device for converting an object image passed through the optical unit into an electrical image signal.

For example, the digital signal processor can increase or decrease the tilting angle of the imaging block in proportion to the rotational speed of the vehicle, in the same direction as the rotational direction of the vehicle.

For example, when the angle of view (?) Of the imaging block in the vehicle stop state satisfies the relationship of -A <? <+ A (0 degrees <A <180 degrees)

When the rear of the vehicle rotates in the rightward rotation direction (+ angle direction), the imaging block rotates by the angle? In the left rotation direction, and the angle of view of the imaging block becomes -A +? <? <+ A +? α> 0),

When the rear of the vehicle is rotated in the left rotational direction (-angle direction), the imaging block rotates by an angle of? In the right rotational direction, and the angle of view of the imaging block becomes -A-? <? (Β> 0).

For example, the actuator may be a motor that is connected to the rotating shaft,

The imaging block may be integrally tilted together with the pivot shaft.

For example, the camera module may further include an encoder for detecting a tilting angle of the imaging block.

According to another aspect of the present invention, there is provided a camera module,

A camera module for capturing a rear image of a heavy equipment vehicle,

A housing fixed to one side of the heavy equipment vehicle;

An imaging element disposed in the housing;

A zoom lens which is supported so as to be movable forward and backward along an optical axis in front of the image pickup element;

An actuator for driving a zooming in / zooming out operation of the zoom lens; And

And a digital signal processor for controlling the actuator and controlling the zooming / zooming-out operation of the zoom lens according to the rotational speed of the vehicle output from the gyro sensor.

For example, the digital signal processor can move the zoom lens from the zoom-in position to the zoom-out position in a direction that is the same as the rotational direction of the vehicle, in proportion to the rotational speed of the vehicle.

For example, when the rotational speed of the vehicle changes from the first speed to the second speed,

When the rotation speed decreases as the first speed > second speed, the zoom lens moves to the zoom-in position,

When the rotation speed increases as the first speed < second speed, the zoom lens can move to the zoom-out position.

For example, the angle of view of the image pickup element can be narrowed in the zoom-in operation and widened in the zoom-out operation.

For example,

A lens motor, and a lead screw spirally surrounding a drive shaft of the lens motor,

A clip may be formed on one side of the lens barrel in which the zoom lens is assembled to fit the lead screw.

According to the present invention, by detecting the rotational speed of a heavy duty vehicle such as an excavator and enlarging the rear surveillance region adaptively to the rotational speed, it is possible to eliminate the driver's rectangular area within the working radius, Even in the case of rotation, the surveillance area enlarged in accordance with the rotation speed is provided, so that the operation against the collision can be made with sufficient time margin.

1 is a block diagram of a camera module according to an embodiment of the present invention.
FIGS. 2 to 5 are views showing different phases in which the tilting of the imaging block changes according to the rotation of the vehicle.
6 is an exploded perspective view of the camera module shown in FIG.
7 is a block diagram of a camera module according to another embodiment of the present invention.
8 is a perspective view showing an embodiment of an actuator for driving the zoom lens shown in Fig.
9 and 10 are diagrams illustrating an embodiment of a zoom operation according to an embodiment of the present invention.
11 is a view showing that the angle of view of the imaging block is enlarged by the zooming operation in accordance with the rotation of the vehicle.

Hereinafter, a camera module according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a camera module according to an embodiment of the present invention. Referring to the drawings, the camera module 100 includes an imaging block 110 for capturing an image of a subject in the rear of a vehicle, and a controller 110 for processing the output signal of the imaging block 110 and converting the output signal into a quantized digital image signal An analog front end (AFE) circuit 161, a memory 162 for temporarily storing an image signal to provide a work area for signal processing, an overall data flow, A digital signal processor 150 may be included.

The imaging block 110 may include an optical unit 111 including an optical lens and an imaging element 115 for converting an object image passed through the optical unit 111 into an electrical image signal. The optical unit 111 may include at least one optical lens, such as a zoom lens or a focus lens, for imaging an object image on the imaging surface.

The image pickup device 115 can be, for example, a CCD (Charged Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and can convert an image of a subject incident via an optical unit into an electrical image signal .

For example, the analog front end circuit (161, AFE circuit) may be configured to perform correlated double sampling (IFFT) on the output signal of the imaging element 115 to maintain a high signal- CDS) method and carries out an AGC (Auto Gain Control) process, the analog video signal output from the image pickup device 115 can be converted into a digital video signal.

The digital image signal output from the image pickup device 115 is transmitted to a display panel 190 provided in a vehicle interior (cab), and can be converted into a form of a video image that can be visually recognized by the driver. At this time, the digital video signal may be provided in the form of a composite image in which a back image represented by a digital video signal and other video images are synthesized thereon. For example, the image signal output from the image pickup device 115 can be temporarily stored in the memory unit 162, and under the control of the digital signal processor 150, a predetermined image process such as edge extraction, Contour lines can be provided in the form of an emphasized composite image. The digital video signal output from the image pickup device 115 may be compression-encoded through an encoder / decoder (not shown) and then stored in the recording medium 163. [

The memory unit 162 may provide a work area for various data processing and may include a DRAM (Dynamic Random Access Memory, or SDRAM). For example, the digital signal processor 150 The memory unit 162 can be used as a work area.

The digital signal processor 150 executes a program recorded in an EEPROM 151, and controls the components of the camera module 100 as a whole and performs various processes.

As will be described later, the digital signal processor 150 measures the rotational speed of the vehicle in real time using the gyro sensor 130 and tilts the imaging block 110 in the same direction according to the measured rotational speed And a rear image having a wider angle of view in the rotational direction adaptively to the rotational speed of the vehicle.

For example, in addition to the driving mode, the heavy duty vehicle can operate in a swing mode that rotates in place to perform a construction work or the like. At this time, under the swing mode, if the rotation speed of the vehicle is high, it is necessary to secure a wider surveillance area in the rotation direction. At this time, the digital signal processor 150 can provide a wider surveillance area in the rotation direction in proportion to the rotation speed of the vehicle by controlling the tilting angle of the imaging block 110 responsible for image capture.

A gyro sensor 130 for capturing the rotational speed of the vehicle (corresponding to the rotational angular velocity) may be mounted on one side of the camera module 100. The gyro sensor 130 is integrally rotated together with the vehicle, and can measure the rotational speed of the vehicle.

A gyro filter 131 having a selective characteristic with respect to a specific band is disposed at the output side of the gyro sensor 100 to extract necessary components and an appropriate integration process is performed in the arithmetic unit 132 arranged next, . The digital signal processor 150 can change the angle of view by referring to the calculated rotational speed of the vehicle and tilting the imaging block 110 in the same rotational direction. In an embodiment of the present invention, the imaging block 110 may be interlocked with the rotational speed of the vehicle, and by tilting the imaging block 110 as much as the rotational speed of the vehicle increases, of view can be further enlarged in the rotating direction.

A heavy duty vehicle such as an excavator can operate in a swing mode that swivels 360 degrees in place so that the angle of view of the imaging block 110 is tilted along the direction of rotation, You need to monitor. For example, when swinging at a rapid swinging direction in one rotation direction, a wider angle of view (or viewing angle) is secured in the direction of rotation, and the presence of persons or objects within the working radius around the equipment is detected, .

In the swing motion that rotates in one rotation direction, it is necessary to enlarge the angle of view (or the viewing angle) in one rotation direction, but it is not necessary to enlarge the angle of view in the opposite rotation direction. That is, it is necessary to confirm the presence of objects in the rotation direction by reflecting a wider angle of view (or viewing angle) along the current rotation direction, and to reflect them in the driving operation. However, the angle of view There is no need to expand.

For example, when the angle of view? Of the imaging block 110 in the vehicle stop state is in the left-right direction with respect to the front face, -A <? <+ A (0 degree <A <180 degrees) When the imaging block 110 is swung in the rotation direction (+ angle direction), the imaging block 110 is tilted by an angle? In the right rotation direction and the angle of view? Of the imaging block 110 is -A +? & can be α (α> 0).

Similarly, when the rear of the vehicle swings in the left rotational direction (-angle direction), the imaging block 110 is tilted by an angle of? In the left rotational direction, and the angle of view? Of the imaging block 110 is -A- β <θ <+ A-β (β> 0).

When the imaging block 110 is tilted by an angle? Or? Angle, the angle of view of the imaging block 110 is increased by the tilting angle (? Angle or? Angle) in the rotating direction and the tilting angle alpha angle or beta angle). By tilting the imaging block 110 itself in the rotational direction of the vehicle, a wider angle of view can be ensured along the rotational direction of the vehicle, and the angle of view can be narrowed in the opposite direction so that the driver's attention is not dispersed.

In addition to the tilting operation of the imaging block 110, the angle of view of the imaging block 110 can be enlarged on both the left and right sides with respect to the front face through the zooming operation of the imaging block 110. However, It is necessary to control the zooming operation of the vehicle, and the angle of view becomes wider in both the rotational direction and the opposite rotational direction of the vehicle, so that the driver's attention may be dispersed.

FIGS. 2 to 5 are views showing different phases in which the tilting of the imaging block 110 changes in accordance with the rotation of the vehicle. In the drawings, the angle of view is narrowly shown, but this is only for convenience of understanding, and the present invention is not limited thereto. For example, in the figures, -A and + A may correspond to -110 degrees and + 110 degrees, respectively.

When the angle of view of the imaging block 110 is equal to ± 110 degrees in the left and right direction with respect to the front face C in the stopped state in which the rear of the vehicle 500 is not rotated, The imaging block 110 can be tilted at different tilting angles in the right direction (+ angle direction) or the left direction (- angle direction) according to the speed of the imaging block 110, and thus the rear surveillance region can be changed.

More specifically, as shown in Fig. 2, when the rear of the vehicle 500 rotates in the right direction (+ angular direction) with the first rotation speed W1 (first angular speed), the imaging block 110 rotates in the same direction The angle of view? Of the imaging block 110 is -A +? &Lt;? + + A +? (?>) As the imaging block 110 is tilted in the rotational direction more than the vehicle, 0). &Lt; / RTI > For example, when the angle of view of the imaging block 110 is -110 to +110 degrees in the stopped state of the vehicle 500, when the rear of the vehicle is rotated in the right direction (+ angle direction) 80 to +140 degrees.

At this time, the range (hatched range) in which the angle of view is enlarged to the right is variably set in conjunction with the rotational speed of the vehicle 500, and the rotational speed of the vehicle 500 is captured every moment, The tilting angle of the imaging block 110 is controlled in real time and the rear surveillance region is changed in accordance with the tilting angle of the imaging block 110. [

3, when the rear of the vehicle 500 rotates in the rightward direction (+ angle direction) at the second rotational speed W2 that is slower than the first rotational speed W1, the rotational speed of the vehicle 500 is relatively The tilting angle of the imaging block 110 is set to be as small as it is. For example, in the still state, the angle of view of -110 to +110 degrees can be tilted at -100 to +120 degrees. However, as shown in FIG. 2, if the rotational speed of the vehicle 500 is relatively fast, the tilting angle of the imaging block 110 is set to be as large as that, for example, -80 degrees to +140 degrees .

4, when the rear of the vehicle 500 rotates in the left direction (-angle direction) at the first rotation speed W1 (first angular speed), the imaging block 110 moves in the leftward direction And the angle of view of the imaging block 110 can be enlarged to the left by -A-? &Lt; + A-? (?> 0). For example, when the angle of view of the imaging block 110 is -110 to +110 degrees in the stopped state of the vehicle 500, when the rear of the vehicle rotates in the left direction (-angle direction) The angle of view can be enlarged in the left direction from -140 to +80 degrees.

5, when the rear of the vehicle 500 rotates leftward at a second rotational speed W2 (second angular speed) that is slower than the first rotational speed W1, the rotational speed of the vehicle 500 is relatively high The tilting angle of the imaging block 110 is set to be as small as it is, and for example, the angle of view of -110 to +110 degrees in the stationary state can be tilted to -120 to +100 degrees. However, as shown in FIG. 4, if the rotational speed of the vehicle 500 is relatively fast, the tilting angle of the imaging block 110 is set to be as large as that, for example, -140 degrees to +80 degrees .

In one embodiment of the present invention, the gyro sensor 130 attached to one side of the vehicle is used to detect the rotational speed of the vehicle, and the imaging block 110 is tilted in the same rotational direction according to the rotational speed of the vehicle , The rearward surveillance region is enlarged in the rotational direction of the vehicle. Therefore, during the swing mode of the vehicle, the risk of accident can be reduced by knowing in advance the existence of objects located within the working radius in the rotating direction.

Fig. 6 is an exploded perspective view of the camera module shown in Fig.

The camera module 100 includes an imaging block 110 supported on a pivot shaft 125 and an actuator 120 for rotating the imaging block 110 through the pivot shaft 125 And a housing 180 that houses the imaging block 110 and the actuator 120. The image pickup block 110 includes an optical unit 111 including an optical lens for imaging an image of a subject with respect to an image pickup surface and an optical unit 111 for converting an object image passed through the optical unit 111 into an electrical image signal And may include an image pickup element 115. The optical unit 111 may include at least one optical lens such as a zoom lens or a focus lens.

The imaging block 110 may be integrally rotated together with the pivot shaft 125. The pivot shaft 125 may be designed to be coaxial with the driving shaft of the actuator 120, (Not shown). The imaging block 110 can be driven to tilt according to the controlled driving force of the actuator 120 and to increase the tilting angle in proportion to the rotational speed of the vehicle and in proportion to the rotational speed of the vehicle.

The actuator 120 provides a rotational driving force to the pivot shaft 125 and receives a controlled driving signal from the digital signal processor 150 and integrally rotates the imaging block 110 together with the pivot shaft 125 And tilts the target position (target tilting angle).

For example, the actuator 120 may include a servo motor that can control the rotational position of the pivot shaft 125. [ For example, the actuator 120 may include a motor for driving a driving force and an encoder 121 for detecting a rotational position of the motor. The rotational position of the pivot shaft 125 (or the tilting angle of the imaging block 110) can be approached to the target position by performing a feedback control by inputting a detection signal relating to the rotational position output from the encoder 121 .

The housing 180 may include an upper cover 181 and a lower cover 182 disposed above and below the imaging block 110 and the like to receive the imaging block 110 and the actuator 120. The upper cover 181 and the lower cover 182 protect the imaging block 110 and the actuator 120 from the external environment and provide an environment isolated from the external environment.

A gyro sensor 130 may be disposed on one side of the housing 180. The gyro sensor 130 may be attached to an upper cover 181 or a lower cover 182 which can be attached to the vehicle and rotated integrally to detect the rotational speed of the vehicle. Here, turning integrally with the vehicle means that the vehicle is rotating in the same manner as the heavy equipment vehicle and has the same rotational angular velocity.

The gyro sensor 130 is attached to one side of the housing 180 integrally fixed to the rear of the vehicle, and can rotate integrally with the vehicle. The gyro sensor 130 may measure the rotational speed of the vehicle (including information on the rotational direction), and the measured rotational speed of the vehicle may be transmitted to the digital signal processor 150.

The digital signal processor 150 that receives the rotation speed of the vehicle (including the rotation direction) from the output signal of the gyro sensor 130 tilts the imaging block 110 in the same rotational direction according to the measured rotational speed of the vehicle And outputs the generated driving signal to the actuator 120. The driving signal generating unit 120 generates the driving signal based on the driving signal. The actuator 120 performs tilting driving of the imaging block 110 in accordance with the received driving signal and performs feedback control using the output of the encoder 120 for monitoring the tilting state of the imaging block 110 as an input. The block 110 may approach the target tilting angle. In one embodiment of the present invention, feedback control of the imaging block 110 may be accomplished by cooperation of the actuator 120 and the digital signal processor 150. [

The present invention can detect the rotational speed of the vehicle by utilizing the gyro sensor 130 attached to the camera module 100 so that it is possible to detect the rotational speed of the vehicle only by mounting and installing the camera module 100, The rear monitoring area can be variably set according to the rotation speed. That is, without changing the structure of the vehicle itself, it is possible to detect the rotational speed of the vehicle and adaptively change the rear surveillance region of the camera module 100 without being related to the steering structure of the vehicle.

6, a transparent window 140 is attached to one side of the housing 180, for example, the upper cover 181, in order to obtain a subject image. The transparent window 140 may be formed in a long shape extending along the tilting direction in consideration of the tilting range of the imaging block 110 for capturing an object image.

7 is a block diagram showing a camera module according to another embodiment of the present invention. The camera module 100 includes an imaging block 110 for capturing an image of an object behind the vehicle and an analog front end for processing the output signal of the imaging block 110 and converting the output signal into a quantized digital image signal A front end (AFE) circuit 161, a memory 162 for temporarily storing a video signal to provide a work area for signal processing, a digital signal processor 162 for collectively controlling the overall data flow, (150).

The imaging block 110 includes an optical unit 200 including at least one optical lens for imaging an object image on an imaging surface, an imaging unit 200 for converting an object image passed through the optical unit 200 into an electrical signal, Device 115 as shown in FIG.

The image pickup element 115 is a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) image sensor. The image pickup element 115 converts an image of a subject incident via the optical unit 200 into an electrical image signal can do.

The optical unit 200 may include at least one or more optical lenses for imaging an object image with respect to an imaging surface. For example, the optical unit 200 may include a zoom lens 221 that moves back and forth along the optical axis L direction and changes the focal distance. The zoom lens 221 may include one lens or two or more lenses.

The digital signal processor 150 controls the zoom in or zoom out operation by moving the zoom lens 221 back and forth in the direction of the optical axis L through the actuator 120. [ In the zooming-in operation, an object of the distant object is pulled as if it is in close proximity, and the angle of view of the imaging block 110 becomes narrower instead of enlarging the object image. Here, the narrow angle of view of the imaging block 110 means that the surveillance area that can be captured by the imaging block 110 is narrow, but the subject image is enlarged and can be monitored in detail. Therefore, when the heavy- It may be a suitable zoom mode.

On the contrary, in the zoom-out operation, an image of a close object is pushed as if it is at a distance, and the angle of view of the imaging block 110 is widened instead of the object image being reduced. Here, the wide angle of view of the imaging block 110 means that the surveillance area that can be captured by the imaging block 110 is enlarged, and thus can be a zooming mode suitable for high-speed rotation of the heavy equipment vehicle.

For example, the digital signal processor 150 captures the rotational speed of the vehicle through the gyro sensor 130, and controls the zoom-in or zoom-out operation so as to variably optimize the angle of view of the image sensing device according to the rotational speed. That is, it is preferable to increase the angle of view of the imaging device as the rotational speed of the heavy equipment increases, so that the zoom lens 221 is driven in the direction of the optical axis L to perform the zoom-out operation. In the zoom-out state, instead of reducing the overall image of the object, it is possible to monitor the wide turning radius.

If the rotational speed of the vehicle is reduced, it may be desirable to enlarge and display the subject image in detail, instead of narrowing the angle of view of the imaging block 110. Therefore, the zoom lens 221 is driven in the direction of the optical axis L, . In the zoom-in state, the angle of view is reduced so that the monitorable turning radius is reduced, and the subject image is enlarged.

For example, by sensing the rotational speed of the vehicle in real time and driving the zoom lens 221 back and forth along the direction of the optical axis L according to the rotational speed of the vehicle, for example, as the rotational speed of the vehicle increases, The zoom lens 221 can be driven from the zoom position to the zoom-out position to enlarge the angle of view. Conversely, if the rotation speed decreases, the zoom lens 221 can be driven from the zoom-out position to the zoom- For example, in a stationary state in which the vehicle does not rotate, the zoom lens 221 is in the zoom-in position, and as the vehicle rotates, the zoom lens moves from the zoom-in position to the zoom-out position and the angle of view can be enlarged.

8 shows an embodiment of an actuator 120 for driving the zoom lens 221. In Fig.

Referring to the drawing, the zoom lens 221 may be fitted to a lens barrel 225 provided with a central opening for accommodating the zoom lens 221. A guide portion 228 may be provided at one side of the lens barrel 225 to guide the guide bar 280 extending forward and backward along the optical axis L. [ The clip 228a of the guide portion 228 is fitted to the lead screw 122a surrounding the drive shaft 122 in a spiral shape and the drive shaft 122 is rotated together with the lens motor 123 in the forward / The lens barrel 225 moves in the forward and backward directions along the optical axis L so that the zoom lens 221 moves along the optical axis L together with the lens barrel 225 to perform the zooming operation. Here, the lens motor 123, the drive shaft 122 to which the rotational power of the lens motor 123 is transmitted, and the lead screw 122a can constitute the actuator 120 according to the embodiment of the present invention .

9 and 10 are diagrams illustrating an embodiment of a zoom operation according to an embodiment of the present invention. Referring to the drawings, the imaging block 110 may include at least one or more optical lenses 211, 221, and 231, and may include first through third lenses 211, 221, and 231, for example. Any one or more of the first through third lenses 211, 221, and 231 may be driven in the forward and backward directions along the optical axis L to perform a zoom lens function for realizing a zoom operation. In the illustrated embodiment, the second lens 221 is driven back and forth along the optical axis L between the zoom in position (Fig. 9) and the zoom out position (Fig. 10) and can implement the zoom operation.

The first through third lenses 211 and 221 and the first and third lenses 211 and 231 may be fitted to the respective lens barrels 215 and 225. For example, . The second lens 221 is assembled by being fitted in a movable lens barrel 225 which can move back and forth along the optical axis L and moves together with the moving lens barrel 225 along the optical axis L to implement a zooming operation . The image of the subject passing through the first through third lenses 211, 221, and 231 is imaged on the imaging surface of the imaging element 115 and can be converted into an electrical image signal.

In the illustrated embodiment, the second lens assembly 220 among the first through third lens assemblies 210, 220, and 230 moves along the optical axis L and performs a zooming operation. However, the present invention is not limited thereto At least two or more lens assemblies 210,220 and 230 move together in the direction of the optical axis L and at least two or more lens assemblies 210,220 and 230 move close to each other or away from each other Thereby realizing a zooming operation.

11 is a view showing that the angle of view of the imaging block is enlarged by the zooming operation in accordance with the rotation of the vehicle. In the drawings, the angle of view is narrowly shown, but this is only for convenience of understanding, and the present invention is not limited thereto. For example, in the figure, -A and + A may correspond to -110 degrees and +110 degrees, respectively.

When the angle of view θ of the imaging block 110 is -A <θ <+ A (0 degrees <A <180 degrees) in a state where the rear of the vehicle 500 is not rotated, The angle of view? Of the imaging block 110 can be enlarged by -A-? <? + + A +? On the left and right sides (?> 0).

For example, in a stationary state in which the vehicle 500 does not rotate, an angle of view of -110 degrees to +110 degrees can be equally magnified on both sides of -120 to +120 degrees as the vehicle 500 is rotated. For example, in a stationary state in which the vehicle 500 does not rotate, the zoom lens 220 is in the zoom-in position, moves to the zoom-out position in accordance with the rotation of the vehicle, and the angle of view can be enlarged.

The range hatched in the figure indicates a range in which the angle of view is enlarged according to the rotation of the vehicle 500, and the range in which the angle of view is enlarged can be varied according to the rotational speed W of the vehicle 500. For example, the digital signal processor 150, which has acquired the rotational speed of the vehicle through the gyro sensor 130 (FIG. 7), varies the moving distance of the zoom lens 221 according to the rotational speed W, Can be controlled.

For example, the digital signal processor 150 calculates a target position of the zoom lens 221 according to the rotational speed of the vehicle, and applies an appropriate driving signal to the actuator 120. [ Then, the lens motor 221 as the actuator 120 can perform feedback control based on an output signal of an encoder (not shown) for detecting the rotational position, and can control the zoom lens 221 to approach the target position do.

The gyro sensor 130 is attached to one side of the vehicle and can detect information about the rotational speed of the vehicle while rotating together with the vehicle. For example, the gyro sensor 130 may be fixed within the housing 180 of the camera module 100, as described with reference to FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand the point. Therefore, the true scope of protection of the present invention should be defined by the appended claims.

100: camera module 110: imaging block
111: optical unit 115:
120: actuator 121: encoder
122: drive shaft 122a: lead screw
123: Lens motor 125: Rotation axis of the imaging block
130: Gyro sensor 131: Gyro filter
132: Operator 140: Transparent window
150: digital signal processor 151: EEPROM
161: AFE circuit 162:
163: recording medium 180: housing
181: upper cover 182: lower cover
190: Display panel

Claims

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A camera module for capturing a rear image of a heavy equipment vehicle,
A housing fixed to one side of the vehicle;
A gyro sensor fixed inside the housing for detecting the rotational speed of the vehicle;
An imaging element disposed in the housing;
A zoom lens which is supported so as to be movable forward and backward along an optical axis in front of the image pickup element;
An actuator for driving a zooming-in or zooming-out operation of the zoom lens; And
And a digital signal processor for controlling the actuator and controlling a zooming-in or zooming-out operation of the zoom lens according to a rotational speed of the vehicle output from the gyro sensor,
When the rotational speed of the vehicle changes from the first speed to the second speed,
When the rotation speed decreases as the first speed > second speed, the zoom lens moves to the zoom-in position,
Wherein the zoom lens moves to a zoom-out position when the rotation speed increases as the first speed < the second speed.

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8. The method of claim 7,
Wherein an angle of view of the imaging element is narrowed in a zooming operation and widened in a zooming operation.

8. The method of claim 7,
The actuator includes:
A lens motor, and a lead screw spirally surrounding a drive shaft of the lens motor,
Wherein a clip for fitting the lead screw is formed on one side of the lens barrel in which the zoom lens is assembled.