JP2006311260A - Image sensor driving apparatus and imaging apparatus using the same - Google Patents

Abstract

An image sensor driving apparatus and a photographing apparatus capable of adjusting the tilt angle even when the image sensor is not orthogonal to the optical axis direction, that is, when the tilt angle is set.
A base portion whose position is fixed with respect to a lens portion, a movable portion to which an image pickup device is to be attached, and a movable portion that is disposed in the optical axis direction of the lens portion and is movable with respect to the base portion. And three shaft portions 41, 42, 43 that can independently move the position at which the movable portion 22 is supported in the direction of the optical axis of the lens portion. The tilt angle of the image sensor 23 attached to the movable part 22 can be adjusted by independently moving the positions at which the 43 supports the movable part 22.
[Selection] Figure 2

Description

  The present invention relates to an imaging device such as a surveillance camera device or a video camera device, and more particularly to an imaging device driving device for moving an imaging device in the optical axis direction of a lens and an imaging device using the imaging device driving device.

  First, a technique of a conventional photographing apparatus will be described. Here, a surveillance camera device will be described as an example of an imaging device.

  In recent years, technologies relating to various surveillance camera devices have been proposed. In particular, in surveillance camera devices that monitor day and night, in the daytime, an infrared light cut filter that selectively transmits visible light and absorbs infrared light is placed on the front surface of the image sensor. On the other hand, when shooting at night, the infrared light cut filter placed in front of the image sensor is removed, and shooting including light in the infrared region is performed to increase night shooting sensitivity. However, techniques for improving nighttime monitoring accuracy have been proposed.

  In the surveillance camera device having such a configuration, it is used for photographing depending on conditions such as presence or absence of an infrared light cut filter and illumination when photographing using visible light and photographing using infrared light. The optical path length differs depending on the wavelength shift of the light beam, for example, when shooting including infrared light at night with a configuration optimized for the optical path length when shooting with visible light at daytime There was a problem that the shot video was blurred.

  In order to solve such a problem, for example, when placing an infrared light cut filter on the optical path and when removing it, referring to the focus degree of the video signal output from the image sensor, the focus degree is the highest. By moving the image sensor in the direction of the optical axis to a higher position, the difference in focal length due to the difference in optical path length when shooting with the above-mentioned visible light and visible light including infrared light is corrected. Thus, there has been proposed a surveillance camera device capable of obtaining a sharp image in focus regardless of day or night (see, for example, Patent Document 1).

In such a monitoring camera device, a lead screw is used to move the image sensor, a nut portion is provided rotatably with respect to the lead screw, and the operation is restricted in the optical axis direction by the guide rod. An image sensor is attached to the chassis, and the lead screw is driven to rotate by a stepping motor. With such a configuration, it is possible to move the imaging element by a desired distance in the optical axis direction of the lens by rotating the lead screw by the rotation of the stepping motor.
JP 2003-274229 A

  In the monitoring camera device as described above, the image sensor is moved by moving the chassis having the image sensor supported by the two axes of the lead screw and the guide rod in the optical axis direction.

  In general, it is desirable that the image sensor is in a state orthogonal to the optical axis direction of the lens in order to capture a sharp image. However, when the image sensor is attached, the image sensor is aligned in the optical axis direction of the lens. Even if it is adjusted so as to be orthogonal to each other, there is actually a slight shift due to variations in component dimensions and assembly, etc. (hereinafter, when such a slight shift occurs) This is described as “when having a tilt angle”, the difference angle from the orthogonal state is denoted as “tilt angle”, and adjusting so as to eliminate this tilt angle is denoted as “tilting angle adjustment”), This shift may cause partial blurring of the image, and may have a significant adverse effect on image quality.

  In the conventional technology as described above, there is a problem that when the imaging element has the tilt angle as described above, the tilt angle cannot be adjusted. As described above, when the image sensor has a tilt angle with respect to the optical axis direction, a partial image blur may occur on the screen. In particular, this phenomenon is caused by a high-resolution image sensor. When used, there is a high possibility of a problem, and the necessity of adjusting the tilt angle is high.

  The present invention has been made in view of such a problem, and even when the imaging element is not orthogonal to the optical axis direction, that is, when it has a so-called tilt angle, the tilt angle can be adjusted. An object of the present invention is to provide an imaging device driving device and a photographing device.

  An image sensor driving apparatus according to the present invention includes a base unit whose position is fixed with respect to a lens unit, a movable unit to which the image sensor is to be mounted, and an optical axis direction of the lens unit. The position where the movable part is supported is independently movable in the optical axis direction of the lens part, and the position where the three shaft parts support the movable part is independent. Thus, the tilt angle of the image sensor attached to the movable part can be adjusted.

  With such a configuration, the movable part to which the image sensor is attached is supported by the three shaft parts that can move in the optical axis direction of the lens part each independently supporting the movable part. When the element is not orthogonal to the optical axis direction, that is, when the element has a so-called tilt angle, it is possible to provide an image sensor driving device that can adjust the tilt angle.

  In addition, there are three motor parts connected to the three shaft parts, and the positions at which the three shaft parts support the movable parts are independently moved in the optical axis direction by the respective driving of the three motor parts. May be.

  According to such a configuration, since the three shaft portions are the shafts of independent motor portions, the image pickup device has a so-called tilt angle by driving these motor portions independently. In addition, it is possible to provide an image sensor driving device capable of adjusting the tilt angle.

  Each of the three motor units may be a direct acting motor.

  According to such a configuration, a configuration with less mechanical rattling can be realized.

  Moreover, the structure which has a control part which performs control which moves each of the three shaft parts to the position which supports a movable part independently in an optical axis direction with respect to three motor parts may be sufficient.

  According to such a configuration, it is further possible to realize a configuration in which the position where each of the three shaft portions supports the movable portion can be independently controlled by the control portion.

  Moreover, the structure which has three bearing parts corresponding to each of the three axial parts in a movable part may be sufficient.

  According to such a configuration, since the three shaft portions can be supported by the three bearing portions, the image sensor can be moved more stably.

  Further, the three bearing portions have one round hole portion and two long hole portions that are long in a direction perpendicular to each other, and each of the three bearing portions is in contact with the respective tip end portions of the three shaft portions. The structure which touches may be sufficient.

  According to such a configuration, the position of one tip of the three shaft portions can be determined by one round hole portion, and three long hole portions that are long in directions orthogonal to each other can be used. Even if the remaining two tip portions of the two shaft portions are held and the parallelism between the shaft portions is slightly shifted, the tip portion slides in the elongated hole portion, It is possible to realize a configuration capable of correcting the shift and stably holding the movable portion.

  Further, each of the three motor parts is a rotary motor, each of the three shaft parts has a screw part, and each of the three bearing parts has a nut part corresponding to the screw part, Also good.

  According to such a configuration, since each of the three shaft portions is held by each of the three nut portions, a configuration excellent in impact resistance can be realized.

  Further, the three shaft portions are rotatably attached to the base portion, and include a belt portion arranged to rotate each of the three shaft portions, and a rotary motor portion that rotates the belt portion. May be.

  According to such a configuration, a configuration in which the position where the three shaft portions support the movable portion can be moved in the optical axis direction with a simple configuration of using one rotary motor portion and a belt portion. Can be realized.

  In addition, each of the three shaft portions includes a rotatable outer shaft portion, and a fixing portion that fixes the three shaft portions and the outer shaft portion, and the belt portion rotates the outer shaft portion. The arrangement may be such that the tilt angle of the image sensor is adjusted in a state where the three shaft portions and the outer shaft portion are not fixed by the fixing portion.

  According to such a configuration, further, at the time of assembly, the position where the three shaft portions support the movable portion is independently moved and adjusted without fixing the outer shaft portion and the shaft portion by the fixing portion. After that, the outer shaft portion and the shaft portion are fixed by the fixing portion, and thereafter, the configuration in which the three shaft portions can move in the optical axis direction in synchronization with the position where the movable portion is supported. Can be realized.

  Further, the rotary motor unit may be configured to directly rotate one of the three shaft units.

  According to such a configuration, a simpler configuration capable of performing tilt adjustment can be realized.

  Moreover, the structure which has three bearing parts corresponding to each of the three axial parts in a movable part may be sufficient.

  According to such a configuration, since the three shaft portions can be supported by the three bearing portions, the image sensor can be moved more stably.

  Further, the three bearing portions have one round hole portion and two long hole portions that are long in a direction perpendicular to each other, and each of the three bearing portions is in contact with the respective tip end portions of the three shaft portions. The structure which touches may be sufficient.

  According to such a configuration, the position of one tip of the three shaft portions can be determined by one round hole portion, and three long hole portions that are long in directions orthogonal to each other can be used. Even if the remaining two tip portions of the two shaft portions are held and the parallelism between the shaft portions is slightly shifted, the tip portion slides in the elongated hole portion, It is possible to realize a configuration capable of correcting the shift and stably holding the movable portion.

  Further, each of the three shaft portions may have a screw portion, and each of the three bearing portions may have a nut portion corresponding to the screw portion.

  According to such a configuration, since each of the three shaft portions is held by each of the three nut portions, a configuration excellent in impact resistance can be realized.

  In addition, an elastic portion is provided between the base portion and the movable portion and applies an urging force in a predetermined direction to the movable portion, and the three shaft portions are urging forces applied to the movable portion by the elastic portion. The structure which provides the urging | biasing force of the opposite direction with respect to a movable part may be sufficient.

  According to such a configuration, since the elastic portion is urged in a predetermined direction with the base portion and the movable portion to which the image sensor is attached, the three shaft portions include the base portion and the image sensor. By urging a force in the direction opposite to the urging force applied between the three shaft portions, the position where the three shaft portions support the movable portion can be moved in the optical axis direction.

  Further, the elastic portion may be a helical spring.

  According to such a configuration, the image sensor driving device of the present invention can be realized with a simple configuration in which a helical spring is used.

  Next, an imaging device of the present invention includes a lens unit, an image sensor, an image sensor driving device of the present invention, and a video signal processing unit that performs video signal processing on a signal output from the image sensor. It is characterized by that.

  With such a configuration, the movable part of the image sensor driving device to which the image sensor is attached is independently supported by three shaft parts that can move the position of supporting the movable part in the optical axis direction of the lens part. Since the tilt angle can be adjusted even when the image sensor is not orthogonal to the optical axis direction, that is, when it has a so-called tilt angle, the focus angle can be adjusted in all areas on the screen. It is possible to provide a photographing apparatus capable of obtaining a sharp and consistent image.

  The imaging device of the present invention includes a lens unit, an image sensor, an image sensor driving device of the present invention, an image dividing unit that divides an image output from the image sensor into a plurality of blocks, and an image dividing unit. A degree-of-focus calculation unit that calculates the degree of focus for each block, and the control unit drives each of the three motor units based on the value of the degree-of-focus calculated by the degree-of-focus calculation unit. The structure characterized by performing control may be sufficient.

  According to such a configuration, it is possible to realize a configuration that can automatically adjust the tilt not only at the time of factory shipment but also in the market.

  As described above, according to the present invention, when the imaging device is not orthogonal to the optical axis direction, that is, when it has a so-called tilting angle, the tilting angle can be adjusted. A driving device and an imaging device can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, the configuration of the photographing apparatus 1 according to the first embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing a part of the configuration of the photographing apparatus 1 according to the first embodiment of the present invention.

  For the sake of simplicity, in the embodiment of the present invention, directions of the X axis, the Y axis, and the Z axis that are orthogonal to each other are shown in the drawings. The X-axis direction is the optical axis direction of the lens unit 101, and the Y-axis direction and the Z-axis direction are directions perpendicular to the optical axis direction.

  As shown in FIG. 1, in the imaging apparatus 1 according to the first embodiment of the present invention, the lens mount unit 2 to which the lens unit 101 is attached, the imaging element 23, the imaging surface 97 of which is the optical axis direction of the lens unit 101. An image sensor driving device 20 that is driven so as to move in the optical axis direction (X-axis direction) in a state orthogonal to the image sensor, a filter holding unit 3 provided between the image sensor driving device 20 and the lens mount unit 2, A filter driving unit 4 having a DC motor disposed on the filter holding unit 3 and moving a filter unit 5 (described later) in a direction perpendicular to the optical axis (Y-axis direction) is attached to the filter driving unit 4. A filter drive shaft 99 that can be moved in the Y-axis direction by driving, an infrared light cut filter 98 that is attached to the filter drive shaft 99 and that can move along with the filter drive shaft 99 in the Y-axis direction. Filter unit 5 and video signal processing for an electrical signal output from the image sensor 23, movement control of the movable unit 22 of the image sensor drive device 20 to be described later, drive control of the filter unit 5 by the filter driver 4, and the like The circuit unit 80 for performing the various processes is provided.

  In the photographing apparatus 1 according to the first embodiment of the present invention, the lens mount unit 2 and the filter holding unit 3 can be manufactured by a die casting method using aluminum, for example.

  The imaging device 1 according to the first embodiment of the present invention is a so-called surveillance camera device, and drives the filter driving unit 4 according to the brightness of the surroundings to perform the imaging regardless of day and night, and the filtering unit 5. Switch to and shoot. Specifically, the ambient illuminance is detected by an illuminance detection unit (not shown) provided in the circuit unit 80, and when the periphery is bright, an infrared light cut filter 98 is arranged on the optical axis in the visible light region. A color image is taken, and when the periphery is dark, the infrared light cut filter 98 disposed on the optical axis is removed, and a black and white image is taken with light rays having wavelengths including those in the infrared region. The peripheral brightness detection in the photographing apparatus 1 can be performed by comparing the illuminance value detected by the illuminance detection unit mounted on the circuit unit 80 with a predetermined threshold. The circuit unit 80 is an illuminance detection unit. When the detected illuminance value changes beyond a predetermined threshold value, the filter drive unit 4 is instructed to switch the filter unit 5 on the assumption that the time zone between daytime and nighttime is switched. The switching of the filter unit 5 can be performed by moving the filter drive shaft 99 in the Y-axis direction by a DC motor provided in the filter drive unit 4.

  In the photographing apparatus 1 according to the first embodiment of the present invention, the filter unit 5 is switched when there is a change in ambient illuminance, and at that time, an infrared light cut filter 98 is disposed on the optical axis. The wavelength range of the light beam used for photographing shifts due to the change in the optical path length due to movement or retraction, and the difference in the lighting conditions used during photographing (particularly when using illumination for nighttime) For this reason, the optimum in-focus position from the lens unit 101 to the surface on which the photoelectric conversion element in the image sensor 23 is disposed (hereinafter, this surface is referred to as an image surface 97) changes. In order to obtain a sharp image even if such a change in the focus position occurs, the imaging device 1 in the first embodiment of the present invention uses the imaging device 23 and the imaging surface 97 as the lens unit 101. The image sensor driving device 20 is mounted to move in the optical axis direction (X-axis direction) in a state that is perpendicular to the optical axis direction (that is, a state parallel to the YZ plane in FIG. 1).

  In the imaging device 1 according to the first embodiment of the present invention, the circuit unit 80 calculates the degree of focus of an image from the output from the image sensor 23, and the image sensor is located at the position where the focus degree is highest. By moving the image sensor 23 by the driving device 20, a sharp image can be obtained even if the above-described change in the focus position occurs.

  Here, the configuration of the image sensor driving device 20 mounted on the imaging device 1 according to the first embodiment of the present invention will be described. FIG. 2 is a diagram showing a configuration of the image sensor driving device 20 according to the first embodiment of the present invention. 2A is an exploded perspective view showing the configuration of the image sensor driving device 20 according to the first embodiment of the present invention, FIG. 2B is a partial sectional view thereof, and FIG. c) is an enlarged view showing the relationship between the shaft portion 42 and the bearing portion 36.

  First, as shown in FIG. 2A, the image sensor driving apparatus 20 according to the first embodiment of the present invention is provided with a movable part 22 to which an image sensor 23 is attached and an image sensor 23 of the movable part 22 attached. And an L-shaped base portion 21 provided to face a surface opposite to the formed surface. The base portion 21 is attached to a housing (not shown) whose position is fixed with respect to the lens mount portion 2, and the base portion 21 is in a state where the position is fixed with respect to the lens portion 101. is there.

  Returning to FIG. 2A, the base portion 21 of the image sensor driving device 20 in the first embodiment of the present invention is provided with three holes 31 and one hole 32. In the base portion 21, motor portions 24, 25, and 26, which are linear actuators, are provided with shafts 41, 42, and 43 from a surface opposite to the surface facing the movable portion 22 of the base portion 21 by screws 30. It is attached so as to pass through the three holes 31 described above in parallel with each other, and each of the shaft portion 43 of the motor portion 24, the shaft portion 41 of the motor portion 25, and the shaft portion 42 of the motor portion 26 includes three parts. The three bearing portions 35, 36, and 37 provided on the movable portion 22 are in contact with each other through the hole portions 31. As shown in FIG. 2A, the shaft portion 43 is in contact with the bearing portion 35, the shaft portion 42 is in contact with the bearing portion 36, and the shaft portion 41 is in contact with the bearing portion 37.

  Further, as shown in FIGS. 2A and 2B, the movable portion 22 to which the image sensor 23 is attached is a suspension that is held by a spring fixing portion 27 that is fixed to the base portion 21 by screws 40. The spring 28 is held in a state where an urging force in a direction approaching the base portion 21 is applied. The helical spring 28 is attached between the spring fixing portion 27 of the base portion 21 and the spring holding portion 38 provided on the surface opposite to the surface on which the imaging element 23 of the movable portion 22 is provided. It arrange | positions in the state which passed 21 hole 32.

  In addition, the base part 21 and the movable part 22 in the first embodiment of the present invention can be produced by pressing or molding using materials such as aluminum and stainless steel, respectively.

  Further, the position where the spring holding portion 38 provided on the movable portion 22 is provided (more precisely, the position where the biasing force in the direction approaching the base portion 21 is applied by the helical spring 28) is applied by the helical spring 28. The urging force in the direction in which the movable part 22 approaches the base part 21, and the urging force applied to the movable part 22 in the direction in which the movable part 22 and the base part 21 are separated by the shaft parts 41, 42, 43. It is necessary to have a position that can be balanced.

  In the imaging device driving device 20 of the imaging device 1 according to the first embodiment of the present invention, the base portion 21 provided by the helical spring 28 and the movable portion 22 provided with the imaging device 23 approach each other. A force in a direction opposite to the urging force, that is, a force in a direction in which the movable portion 22 and the base portion 21 are separated from each other is applied to the shaft portions 41 and 42 of the three motor portions 24, 25, and 26 provided in the base portion 21. , 43 to the movable portion 22, the movable portion 22 moves in the optical axis direction (X-axis direction) with respect to the base portion 21, whereby the image sensor 23 is in the optical axis direction of the lens portion 101. Can be moved to. In order for the image pickup device 23 to move in the optical axis direction while being perpendicular to the optical axis of the lens unit 101, the shaft units 41, 42, and 43 of the three motor units 24, 25, and 26 are synchronized. It is necessary to perform the same amount of displacement in the X-axis direction at the same speed. In order to cause such displacement, for example, the same type of motor can be used as the three motor units 24, 25, and 26, and the same number of drive steps can be given to each motor. It is.

  Further, as shown in FIG. 2C, the tip portions of the shaft portions 41, 42, and 43 have a shape that decreases in diameter toward the tip, and the bearing portions 35, 36, and 37 that are in contact with the shaft portions 41, 42, and 43 It has a so-called slip-like shape corresponding to the tip shape of the portions 41, 42, 43.

  In the imaging element driving device 20 according to the first embodiment of the present invention, the opening of the bearing portion 36 among the three bearing portions 35, 36, and 37 has a circular shape (so-called round hole), and the bearing portion 35. The opening is an elliptical shape (so-called elongated hole) that is long in the Y-axis direction, and the opening of the bearing portion 37 is an elliptical shape (so-called elongated hole) that is long in the Z-axis direction. Thus, among the three bearing portions 35, 36, and 37, one has a round hole shape, and the other two have a long hole shape in which the major axis directions are orthogonal to each other, thereby forming a bearing portion that is a round hole. 36 determines the position of the tip portion of the shaft portion 42, and the shaft portion 43 is held by the bearing portion 35 that is long in the Y-axis direction. Therefore, while the shaft portion 43 is in contact with the bearing portion 35, the Y axis A structure having a so-called play that can slide to some extent in the direction can be realized. Similarly, in the Z-axis direction, since the shaft portion 41 is held by the bearing portion 37 that is long in the Z-axis direction, a certain amount of sliding is also caused in the Z-axis direction while the shaft portion 41 is in contact with the bearing portion 37. A playable configuration can be realized. Therefore, when the image pickup device 23 is actually moved in the X-axis direction, the image pickup device 23 is moved during the movement even if the directions of the shaft portions 41, 42, and 43 are not strictly parallel. It is difficult to vibrate in the direction and the X-axis direction, and a configuration that can smoothly move the image sensor 23 in the optical axis direction can be realized.

  In addition, if the image sensor driving device 20 of the imaging device 1 according to the first embodiment of the present invention is used, the three motor units 24, 25, and 26 that can be controlled independently are used. By independently controlling the motor parts 24, 25, and 26 so that the respective shaft parts 41, 42, and 43 move in the X-axis direction, the so-called imaging element 23 does not appear to be orthogonal to the optical axis direction. Even in such a case, it is possible to adjust the orientation of the image sensor 23 so as to eliminate the tilt angle. Specifically, this adjustment is performed by each motor unit 24 so that the adjuster can focus on the entire area of the image while looking at an image such as a focus adjustment test chart actually captured by the image sensor 23. , 25, 26 can be performed by adjusting the positions of the shaft portions 41, 42, 43 in the X-axis direction.

  In the above-described example, the helical spring 28 is used as means for applying an urging force in a direction in which the movable portion 22 to which the image sensor 23 is attached and the base portion 21 are brought closer to each other. However, the present invention is not limited to this example. Needless to say, any other known elastic means such as rubber can be used.

  In the above-described example, the linear actuators are used as the motor units 24, 25, and 26. However, the image sensor driving device 20 according to the first embodiment of the present invention is not limited to this configuration. It is possible to use various types of so-called linear motion motors.

  As described above, when the imaging device 1 and the imaging device driving device 20 according to the first embodiment of the present invention are used, the imaging device 23 is maintained in a state of being orthogonal to the optical axis direction of the lens unit 101. Can be moved parallel to the optical axis direction, and the position of each of the three shaft portions 41, 42, 43 can be controlled independently to adjust the position of the shaft portions 41, 42, 43. Can be realized.

(Second Embodiment)
Next, an imaging device and an imaging element driving device according to the second embodiment of the present invention will be described.

  FIG. 3 is a diagram for explaining an image sensor driving device 120 mounted on the photographing apparatus according to the second embodiment of the present invention. FIG. 3A is an exploded perspective view showing a configuration of the image sensor driving device 120 mounted in the imaging apparatus according to the second embodiment of the present invention, and FIG. 3B is a side view thereof. .

  Note that the configuration of the imaging device in the second embodiment of the present invention is the same as that of the imaging device 1 in the first embodiment of the present invention shown in FIG. Since it is replaced with the image sensor driving device 120 in the second embodiment of the invention, description of the entire photographing apparatus is omitted.

  As shown in FIG. 3A, the image sensor driving device 120 according to the second embodiment of the present invention includes a movable portion 72 provided with the image sensor 23 and a base portion 71 facing the movable portion 72. The point provided and the point where three motor parts 51, 52, 53 are attached to the base part 71 are common to the image sensor driving apparatus 20 shown in the first embodiment. The configuration of the image sensor driving device 120 according to the second embodiment of the present invention is different from the configuration of the image sensor driving device 20 according to the first embodiment of the present invention in that three motor units 51, 52, and 53 are provided. A rotary type motor is used, the shaft portions 61, 62, and 63 of the motor portions 51, 52, and 53 are provided with male screw portions 183, and the movable portion 72 includes the shaft portions 61, 62, and 63. The bearing portions 65, 66, and 67 having the female screw portion 184 corresponding to the male screw portion 183 are provided, and the helical spring 28 that biases the movable portion 72 and the base portion 71 in one direction is essential. That is not the structure.

  As shown in FIG. 2B, in the imaging element driving device 120 according to the second embodiment of the present invention, the shaft portion 61 of the motor unit 51 is engaged with the bearing unit 65, and the shaft portion of the motor unit 52 is engaged. 62 is engaged with the bearing portion 66, and the shaft portion 63 of the motor portion 53 is engaged with the bearing portion 67. The movable portion 72 has a state orthogonal to the optical axis direction of the lens portion 101. Is attached. In such a state, by synchronizing the motor units 51, 52, and 53 and driving the three shaft units 61, 62, and 63 in the X-axis direction at the same speed and by the same amount, The image sensor driving device 120 according to the second embodiment of the present invention can also move the image sensor 23 in parallel to the optical axis direction in a state of being orthogonal to the optical axis direction of the lens unit 101. It is. Such driving can be realized, for example, by using the same stepping motor as the motor units 51, 52, and 53, and giving control signals that simultaneously drive the same number of steps.

  In the image sensor driving device 120 according to the second embodiment of the present invention, it is not always necessary to use the helical spring 28 as in the image sensor driving device 20 described in the first embodiment. By using elastic means such as the helical spring 28, it is possible to reduce the mechanical rattling of the movable portion 72 and the base portion 71.

  When assembling the imaging element driving device 120 according to the second embodiment of the present invention, first, the three motor parts 51, 52, 53 are attached to the base part 71, and then the respective motor parts 51, 52, The image pickup element driving device 120 can be manufactured by engaging the three shaft portions 61, 62, 63 with the three bearing portions 65, 66, 67 while rotating 53. Further, at the time of assembly, the three motor parts 51, 52, 53 are not completely fastened to the base part 71, but are fastened with some margin, and the motor parts 51, 52, 53 are fastened. , The three shaft portions 61, 62, 63 are engaged with the three bearing portions 65, 66, 67, and then the motor portions 51, 52, 53 are completely fastened to the base portion 71. If it makes it, productivity at the time of manufacture can be improved.

  Also in the image sensor driving device 120 according to the second embodiment of the present invention, the three motor units 51, 52, and 53 are independently provided as in the image sensor driving device 20 according to the first embodiment. Since it can be driven, when the image pickup device 23 is not orthogonal to the optical axis direction of the lens unit 101, and has a so-called tilt angle, three tilt angles are removed so as to remove the tilt angle. By driving the motor units 51, 52, and 53 to rotate independently, it is possible to adjust so that the tilt angle is eliminated.

  Specifically, the adjustment is performed by each motor unit 51, so that the adjuster can focus on the entire area of the image while viewing an image such as a test chart for focusing actually captured by the image sensor 23. This can be done by rotating 52 and 53 and adjusting the distance between the base portion 71 and the movable portion 72.

  Further, in the above-described example, the example in which the bearing portions 65, 66, and 67 having the female screw portion 184 are directly provided on the movable portion 72 to which the imaging element 23 is attached has been shown. The element driving device is not limited to this example. FIG. 4 shows another example of the image sensor driving device according to the second embodiment of the present invention. FIG. 4 is a diagram illustrating another example of the imaging element driving device according to the second embodiment of the present invention. FIG. 4 (a) is an exploded perspective view showing the configuration, and FIG. 4 (b) is a side view thereof. In the image sensor driving device 130 shown in FIG. 4, the bearings 65, 66, and 67 are not directly provided in the movable part 72, but the relatively large three hole parts 92 are opened in the movable part 72. In addition, three fixing portions 75 each having a convex portion 111 having an internal thread portion 94 on the inner side so as to pass through the three hole portions 92 are provided. The configuration of the base unit 71 is the same as that of the above-described imaging element driving device 120, and thus the description thereof is omitted.

  In the configuration as shown in FIG. 4, at the time of assembly, the three motor parts 51, 52, 53 are fastened to the base part 71 with the screws 30, and the three fixing parts 75 are fastened with a margin in advance. By preparing the movable portion 72 and engaging the male screw portion 183 of the shaft portions 61, 62, 63 and the female screw portion 94 of the fixed portion 75 while rotating the three motor portions 51, 52, 53. The base portion 71 and the movable portion 72 can be assembled, and then the fixed portion 75 can be completely fastened to the movable portion 72 with screws 90.

  In the two examples in the present embodiment, male screw portions 183 are formed on the three shaft portions 61, 62, 63 of the three motor portions 51, 52, 53 attached to the base portion 71, and the movable portion. Although the example in which the corresponding female screw portions 94 and 184 are formed inside the bearing portions 65, 66, and 67 or the fixed portion 75 of the 72 is shown, the image sensor driving device and the imaging device of the present invention are not limited to this example. . For example, a male screw portion is formed inside the bearing portions 65, 66, 67 or the fixed portion 75, and corresponding three screw portions 61, 62, 63 of the three motor portions 51, 52, 53 have corresponding female screw portions. Needless to say, it may be formed.

  As described above, when the imaging device and the imaging device driving devices 120 and 130 according to the second embodiment of the present invention are used, the imaging device 23 is maintained in a state orthogonal to the optical axis direction of the lens unit 101. Thus, it is possible to realize a configuration that can be moved parallel to the optical axis direction and that can also adjust tilt by controlling each of the three motor units 51, 52, and 53 independently.

  Furthermore, if the imaging device and the imaging element driving devices 120 and 130 according to the second embodiment of the present invention are used, the three shaft portions 61, 62, and 63 of the three motor portions 51, 52, and 53, and the movable portion 22 are used. Since the bearings 65, 66, 67 or the fixed part 75 are engaged by screws, the position of the lens part 101 of the image sensor 23 relative to the optical axis is displaced even when an impact or the like is applied from the outside. The structure which was excellent in impact resistance can be implement | achieved.

  If the image sensor driving device 20 shown in the first embodiment of the present invention and the image sensor driving devices 120 and 130 shown in the second embodiment are used, three motor units 24, 25, 26, Since the three shaft portions 41, 42, 43, 61, 62, and 63 can be independently driven by the 51, 52, and 53, the presence of a tilt angle at the time of use as well as at the time of factory shipment is a problem. It becomes possible to correct it when it becomes.

  Furthermore, if the image sensor driving device 20 shown in the first embodiment of the present invention and the image sensor driving devices 120 and 130 shown in the second embodiment are used, the tilt angle adjustment in the above-mentioned market is automatically performed. It can also be done automatically. In order to realize this, the circuit unit 80 has an image division unit that divides the image output from the image sensor 23 into a plurality of blocks, and a focus that calculates the degree of focus for each block divided by the image division unit. A degree calculation unit and a control unit capable of controlling the driving of the three motor units 24, 25, 26, 51, 52, and 53, respectively, and calculated by the control unit by the focus degree calculation unit Based on the value of the degree of focus, each of the three motor units 24, 25, 26, 51, 52, 53 may be driven and controlled so that the respective values become higher.

  Furthermore, in the image sensor driving devices 120 and 130 shown in the second embodiment of the present invention, a rotary motor is used as the motor parts 51, 52, and 53, and the bearing part 65 having a screw part in the movable part 72. , 66, 67 or the fixing unit 75 is shown, but the image sensor driving device and the imaging device in the present invention are not limited to this configuration. For example, a rotary type motor is used as the motor units 51, 52, 53, and the movable unit 72 is a bearing unit 35, 36, similar to the movable unit 22 used in the image sensor driving device 20 in the first embodiment. A configuration having 37 is also possible. In this case, it is desirable to use an elastic means such as a helical spring 28 that applies a biasing force in a direction approaching between the movable portion 72 and the base portion 71.

(Third embodiment)
Next, an imaging device and an imaging element driving device according to the third embodiment of the present invention will be described.

  FIG. 5 is a diagram for explaining an image sensor driving device 140 mounted on an imaging device according to the third embodiment of the present invention. FIG. 5A is an exploded perspective view showing a configuration of an image sensor driving device 140 mounted on an imaging apparatus according to the third embodiment of the present invention, and FIG. 5B is a side view thereof. .

  Note that the configuration of the imaging device in the third embodiment of the present invention is the same as that of the imaging device 1 in the first embodiment of the present invention shown in FIG. Since this is a replacement for the image sensor driving device 140 according to the third embodiment of the present invention, description of the entire photographing apparatus will be omitted.

  As shown in FIG. 5A, the imaging element driving device 140 according to the third embodiment of the present invention includes a movable part 122 provided with the imaging element 23 and a base part 121 that faces the movable part 122. The point which is provided, and the point which has the fixing | fixed part 123 containing the convex part 211 which has the internal thread part 204 in the movable part 122 are common in the image pick-up element drive device 130 in 2nd Embodiment.

  In the imaging device driving device 140 according to the third embodiment of the present invention, the rotary motor 230 fixed to the base 121 by the motor fixing unit 149 and the shaft 131 of the rotary motor 230 are attached, and the gears are arranged outside. Each having a gear on the outside, three rotating parts 151 having a shaft part 201, gears formed outside the three rotating parts 151, and a shaft 131 of the rotary motor 230. The belt portion 162 is provided so as to mesh with a gear provided on the outer side of the gear portion 132 and has a concave portion on the inner side. In the image sensor driving apparatus 140 according to the third embodiment of the present invention, the belt unit 162 rotates by rotating the rotary motor 230, and the three rotating units 151 rotate by the rotation of the belt unit 162.

  Here, the configuration of the rotating unit 151 of the image sensor driving device 140 according to the third embodiment of the present invention will be described in more detail. FIG. 5C is an exploded perspective view showing a detailed configuration of the rotating unit 151 of the image sensor driving device 140 according to the third embodiment of the present invention.

  As shown in FIG. 5C, the rotation unit 151 of the image sensor driving device 140 according to the third embodiment of the present invention has a convex portion 206, and faces the fixed portion 123 with the convex portion 206 as a boundary. A shaft portion 201 having a male screw portion 203 on the side (hereinafter referred to as one end side) and a knurling 202 for screwing formed on the opposite side (hereinafter referred to as the other end side). A helical spring 205 for stopping rattling, a washer 207 provided on the other end side of the shaft portion 201, a rotating member 209 formed with a gear on the outside, and a rotating member 209. A screw 208 is provided for fixing on the knurled 202 provided on the other end side of the shaft portion 201.

  In the imaging element driving device 140 according to the third embodiment of the present invention, as shown in FIGS. 5A and 5B, the shaft portion 201 of the rotating portion 151 is the base portion 121. The rotating part 151 is attached so as to pass through three holes (not shown) provided in the base part 121 and the base part 121 is sandwiched between the convex part 206 and the rotating member 209.

  A male screw portion 203 provided on one end side of the shaft portion 201 of the rotating portion 151 engages with a female screw portion 204 provided in the fixed portion 123, and the movable portion 122 is supported by the base portion 121 by the shaft portion 201.

  As described above, according to the imaging element driving device 140 in the third embodiment of the present invention, the rotation of the rotary motor 230 causes the shaft 131 and the gear portion 132 to rotate, and the rotation of the gear portion 132 causes the rotation. A gear provided outside the gear portion 132 rotates to rotate the belt portion 162. The rotation of the belt portion 162 causes the gears provided outside the rotating member 209 of the three rotating portions 151 to rotate, thereby rotating the rotating member 209 and the shaft portion 201 of the rotating portion 151, thereby rotating the shaft portion 201. Thus, the distance between the base portion 121 and the movable portion 122 can be changed.

  In the image sensor driving device 140 according to the third embodiment of the present invention, the shape of the rotating member 209 of the three rotating portions 151 and the shape and pitch of the gears provided on the outside thereof are equal to each other. By rotating the mold motor 230, the three rotating portions 151 can rotate in the same amount at the same speed in synchronization with each other. Further, in the imaging element driving device 140 according to the third embodiment of the present invention, the pitches of the male screw portions 203 formed on the shaft portion 201 of the rotating portion 151 are formed to be equal. Further, the pitches of the female screw portions 204 formed inside the fixed portion 123 attached to the movable portion 122 are also formed to be equal. According to the image sensor driving device 140 according to the third embodiment of the present invention, the base unit 121 is configured in a state where the movable unit 122 is parallel to the base unit 121 with a simple configuration in which one rotary motor 230 is rotated. It is possible to adjust the distance between the part 121 and the movable part 122. In other words, the image sensor 23 provided in the movable portion 122 can move in the optical axis direction while maintaining a predetermined angle with respect to the base portion 121.

  In the image sensor driving device 140 according to the third embodiment of the present invention, the screws 208 of the three rotating parts 151 are loosened when adjusting the tilt angle. Thereby, the rotating member 209 of the rotating part 151 can freely rotate with respect to the shaft part 201. Therefore, even if the rotary motor 230 is rotated in this state, the rotating member 209 of the rotating portion 151 rotates, but the shaft portion 201 does not rotate. In this state, a groove portion 250 (not shown in FIG. 5C) provided on the other end side of the shaft portion 201 is provided with a convex portion 261 (FIG. 5C) provided at the tip of the adjustment motor 260 and the like. , The shaft portion 201 of the rotating portion 151 can be rotated without rotating the rotating member 209. As a result, the tilt angle of the movable portion 122 with respect to the base portion 121 can be adjusted, and the tilt angle with respect to the optical axis direction of the lens portion 101 of the imaging element 23 provided in the movable portion 122 can also be adjusted.

  Specifically, this adjustment is performed by the adjustment motor 260 or the like so that the adjuster can focus on the entire area of the image while viewing the image such as a test chart for focusing actually taken by the image sensor 23. Each of the groove portions 250 of the shaft portion 201 can be rotated to adjust the distance between the base portion 121 and the movable portion 122. After the adjustment of the tilt angle is completed, the tilt adjustment is completed by fastening the screws 208 of the three rotating portions 151 respectively. When the screw 208 is fastened, the rotating member 209 and the shaft portion 201 of the rotating portion 151 rotate in cooperation with each other, and the belt portion 162 rotates due to the rotation of the rotary motor 230. The rotation member 209 and the shaft portion 201 are rotated, and the imaging element 23 is in a state where adjustment of the tilt angle is completed, that is, in a state where the imaging surface 97 is kept in a state orthogonal to the optical axis direction of the lens portion 101. The distance from the lens unit 101 can be adjusted.

  In the imaging element driving device 140 according to the third embodiment of the present invention, an example in which the screw 208 is used as a fixing portion that fixes the rotating member 209 and the shaft portion 201 of the rotating portion 151 is shown. The image sensor driving apparatus of the present invention is not limited to this example. For example, when the tilt adjustment is performed at the time of shipment from the factory and the tilt adjustment is not performed after the shipment, it is needless to say that an adhesive can be used as the fixing portion.

  Further, in the image sensor driving device 140 according to the third embodiment of the present invention, the configuration in which the movable portion 122 has the fixed portion 123 having the female screw portion 204 inside is shown. The apparatus is not limited to this example. For example, it is needless to say that a bearing portion having a female screw portion may be directly formed on the movable portion as in the image sensor driving device 120 shown in FIG.

  Further, in the image sensor driving device 140 according to the third embodiment of the present invention, the rotation of the rotary motor 230 causes the belt portion 162 to rotate, and the rotation causes the rotation members 209 of the three rotation portions 151 to rotate. However, the image pickup element driving device according to the third embodiment of the present invention is not limited to this configuration. For example, it is needless to say that one of the three shaft portions 201 may be configured to be rotationally driven by the rotary motor 230. In such a configuration, for example, at the time of tilt adjustment, an adjustment gear is formed on the outer side of each of the rotating members 209 of the three rotating portions 151 and on a portion not applied to the belt portion 162, and the gear is screwed. It is possible to rotate the rotating members 209 of the three rotating portions 151 without rotating the shaft portion 201 by rotating them with a gear provided on the adjustment motor 260 while the 208 is loose.

  Furthermore, in the imaging element driving device 140 according to the third embodiment of the present invention, the gear provided outside the gear portion 132 of the rotary motor 230 is similar to the rotating member 209 of the three rotating portions 151. Although an example in which the projections and depressions provided on the inner side of the belt portion 162 are engaged is shown, the image sensor driving device 140 according to the third embodiment of the present invention is not limited to this configuration. For example, an unevenness may be formed on the outside of the belt portion 162, and the gear portion 132 of the rotary motor 230 may be configured to rotate the belt portion 162 while pressing the belt portion 162 from the outside.

  Furthermore, in the imaging element driving device 140 according to the third embodiment of the present invention, the gears provided on the outer side of the rotating member 209 of the three rotating parts 151 mesh with the unevenness provided on the inner side of the belt part 162. Thus, the configuration in which each of the three rotating portions 151 rotates by the rotation of the belt portion 162 is shown, but the imaging element driving device and the imaging device of the present invention are not limited to this configuration. For example, the three rotating parts 151 may be configured to rotate by the rotation of large gear parts arranged at positions that mesh with the gears provided outside the rotating member 209 of the three rotating parts 151. . In order to achieve such a configuration, the gears provided on the outer sides of the rotating members 209 of the three rotating parts may be arranged on the circumference of the large gear part.

  Although the image sensor driving devices 20, 120, 130, and 140 in the embodiment of the present invention have been described using examples mounted on the monitoring camera device, the imaging device of the present invention is used for the monitoring camera device. It is not limited to. For example, it goes without saying that the image sensor driving device of the present invention can be mounted on any known camera such as a video camera or a digital camera.

  As described above, according to the imaging device driving device and the imaging device according to the present invention, even when the imaging device is not orthogonal to the optical axis direction, that is, when it has a so-called tilt angle, the tilt angle And an imaging device driving device for moving the imaging device in the direction of the optical axis of the lens unit, and an imaging device such as a surveillance camera device and a video camera device, and the like. It is useful as a photographing apparatus.

1 is an exploded perspective view showing a part of the configuration of a photographing apparatus according to a first embodiment of the present invention. The figure which shows the structure of the image pick-up element drive device in the 1st Embodiment of this invention. The figure for demonstrating the image pick-up element drive device mounted in the imaging device in the 2nd Embodiment of this invention The figure which shows another example of the image pick-up element drive device in the 2nd Embodiment of this invention. The figure for demonstrating the image pick-up element drive device mounted in the imaging device in the 3rd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image pick-up device 2 Lens mount part 3 Filter holding part 4 Filter drive part 5 Filter part 20,120,130,140 Image sensor drive unit 21,71,121 Base part 22,72,122 Movable part 23 Image sensor 24,25, 26, 51, 52, 53 Motor part 27 Spring fixing part 28, 205 Helical spring 30, 40, 90 Screw 31, 32, 92 Hole part 35, 36, 37, 65, 66, 67 Bearing part 38 Spring holding part 41 , 42, 43, 61, 62, 63, 201 Shaft part 75, 123 Fixing part 80 Circuit part 94, 184, 204 Female thread part 97 Imaging surface 98 Infrared light cut filter 99 Filter drive shaft 101 Lens part 111, 206, 211 , 261 Protruding part 131 Shaft 132 Gear part 149 Motor fixing part 151 Rotating part 162 Belt part 183 03 externally threaded portion 202 knurling 207 washer 208 screw 209 rotating member 230 rotates motor 250 groove 260 for the motor for adjusting

Claims (17)

A base portion whose position is fixed with respect to the lens portion;
A movable part to which the image sensor is to be attached;
It is arranged in the optical axis direction of the lens part, supports the movable part with respect to the base part, and can independently move the position supporting the movable part in the optical axis direction of the lens part. With three shafts,
The image sensor drive characterized in that the tilt angle of the image sensor attached to the movable part can be adjusted by independently moving the positions at which the three shaft parts support the movable part. apparatus. Comprising three motor parts connected to the three shaft parts,
2. The image sensor driving apparatus according to claim 1, wherein each of the three motor units is driven to independently move a position where the three shaft units support the movable unit in the optical axis direction. The imaging device driving apparatus according to claim 2, wherein each of the three motor units is a direct acting motor. A control unit that controls the three motor units to independently move the positions at which the three shaft units support the movable unit in the optical axis direction. The image sensor driving apparatus according to claim 2. 5. The image pickup device driving apparatus according to claim 1, wherein the movable portion includes three bearing portions corresponding to the three shaft portions, respectively. 6. The three bearing portions each have one round hole portion and two long hole portions that are long in a direction perpendicular to each other, and each of the three bearing portions includes a tip portion of each of the three shaft portions. The imaging element driving device according to claim 5, wherein the imaging element driving device is in contact. Each of the three motor units is a rotary motor,
Each of the three shaft portions has a thread portion,
The image sensor driving device according to claim 5, wherein each of the three bearing portions has a nut portion corresponding to the screw portion. The three shaft portions are rotatably attached to the base portion;
The image pickup device driving apparatus according to claim 1, further comprising: a belt portion arranged to rotate each of the three shaft portions; and a rotary motor portion that rotates the belt portion. For each of the three shaft portions, a rotatable outer shaft portion, and a fixing portion for fixing the three shaft portions and the outer shaft portion,
The belt portion is arranged to rotate the outer shaft portion,
The image sensor driving apparatus according to claim 8, wherein the tilt angle of the image sensor is adjusted in a state where the three shaft portions and the outer shaft portion are not fixed by the fixing portion. The image sensor driving apparatus according to claim 8 or 9, wherein the rotary motor unit directly rotates one of the three shaft portions. 11. The image pickup device driving apparatus according to claim 8, wherein the movable portion includes three bearing portions corresponding to the three shaft portions, respectively. 11. The three bearing parts have one round hole part and two long hole parts that are long in a direction perpendicular to each other, and each of the three bearing parts has a tip part of each of the three shaft parts. The imaging element driving device according to claim 11, wherein the imaging element driving device is in contact. Each of the three shaft portions has a thread portion,
The image sensor driving apparatus according to claim 11, wherein each of the three bearing portions has a nut portion corresponding to the screw portion. An elastic part that is attached between the base part and the movable part and applies a biasing force in a predetermined direction to the movable part;
The three shaft portions apply an urging force in a direction opposite to the urging force applied to the movable portion by the elastic portion, to the movable portion. The imaging element driving device according to claim 1. The image sensor driving device according to claim 14, wherein the elastic portion is a helical spring. The lens part,
An image sensor;
The image sensor driving device according to any one of claims 1 to 15,
An imaging apparatus, comprising: a video signal processing unit that performs video signal processing on a signal output from the imaging device. The lens part,
An image sensor;
The image sensor driving device according to claim 4,
An image dividing unit that divides the image output from the image sensor into a plurality of blocks;
A degree-of-focus calculation unit that calculates the degree of focus for each block divided by the image dividing unit,
The imaging device according to claim 1, wherein the control unit performs drive control of each of the three motor units based on a value of the focus degree calculated by the focus degree calculation unit.

Images