JP5706738B2 - Shake prevention mechanism for camera unit - Google Patents

Description

  The present invention is mainly applied to a surveillance system, and has a camera housing for a camera unit that does not have a shake correction function and is mounted on a camera housing mounted on a camera-integrated electric head or an electric / semi-fixed head. The present invention relates to a shake prevention mechanism for a camera unit that does not transmit a shake vibration generated by an external force applied to the camera unit.

  Conventionally, as a countermeasure against vibration of a camera such as an image pickup apparatus, an image pickup apparatus, or an image pickup element, it is common to provide a camera body with a shake correction function. There are two types of shake correction methods: electronic and optical. In the electronic method, a video signal is written to the memory, and a part of the image is moved according to the movement of the camera. There is known a CCD drive system for controlling the timing of reading out a video signal from an image signal. In addition, as for the optical type, there are known a gimbal mechanism type that changes the direction by moving the lens according to the movement of the camera, an active prism type that changes the optical axis by moving the prism according to the movement of the camera, and the like.

  Well-known techniques related to such camera vibration countermeasures include, for example, an “imaging device” (see Patent Document 1) in which a camera shake correction mechanism is configured to be small and a general shoulder-mount photography style. In addition, the “anti-vibration device” (see Patent Document 2) that can suppress the vibration of the camera device while being incorporated into the camera body case with a digital still camera or the like that includes a shake correction unit and a control board as separate members. Optimized “camera with shake correction mechanism” (see Patent Document 3), by directly connecting the image sensor to the piezoelectric actuator, the image sensor can be translated in a simple and small mechanism, preventing camera shake to the digital camera "Imaging device" that can be mounted on a mechanism (see Patent Document 4), and a piezoelectric actuator including a frictional coupling part is used as a drive source for vibration isolation. The "shake correction function imaging apparatus and blur correction method" an impact exceeding the holding force of the friction coupling portion is continued stabilization operation without hinder be generated include (Patent Document 5 reference) and the like.

JP 2008-89803 A JP 2008-199469 A JP 2006-78891 A JP 2000-307937 A JP 2006-197216 A

  The technologies according to Patent Document 1 to Patent Document 5 described above are all provided with a shake correction function in the main body of the imaging apparatus and the photographing apparatus except for the structure of Patent Document 2, and have a shake correction function. In a usage environment where a camera unit is mounted on a camera housing mounted on an electric pan head (camera-integrated electric pan head, electric / semi-fixed pan head), vibration vibration generated by external force applied to the camera housing It is not related to the function to prevent effective transmission.

  In general, when the camera housing mounted on the electric pan head generates shaking vibration in the mounted camera unit due to external forces such as wind or vibration at the installation location, the shaking is also displayed on the output monitor screen according to the shaking. In particular, when a subject having a distance of 10 km, for example, is being monitored using a high-power lens in recent years, when the camera unit shakes once, an image shake of about 170 m occurs.

  Therefore, piezoelectric elements are arranged on the bottom and side surfaces of the camera unit itself, and each piezoelectric element is responsive to the shaking vibration of the camera unit (showing an imaging device, an imaging device, an imaging device, etc.) as described in each patent document. (The “vibration isolator” in Patent Document 2 is a telescopic piezo actuator that cancels the displacement caused by the shaking vibration of the shoulder movement of the photographing operator. However, in any case, when a camera unit that does not have a shake correction function is mounted on the camera housing mounted on the electric pan head, including the case where the vibration vibration environment changes. There is a problem that the shaking vibration generated by the external force applied to the camera housing cannot be corrected (not applied).

  The present invention has been made to solve such problems, and its technical problem is that even in a use environment in which a camera unit having no shake correction function is mounted on a camera housing mounted on an electric head, It is an object of the present invention to provide a camera unit anti-sway mechanism capable of effectively correcting shakes generated by an external force applied to the camera housing.

  In order to achieve the above technical problem, the present invention transmits, to a camera unit mounted on a camera housing mounted on an electric head, vibration vibration generated by an external force applied to the camera housing is transmitted to the camera unit. A camera unit shaking prevention mechanism mounted on the camera housing so as not to cause the camera unit to have a first upright portion standing vertically from a flat first flat plate portion for mounting the camera unit, From a pan movable member movable in a horizontal plane direction and a flat second flat plate portion connected in close proximity to a surface of the first flat plate portion opposite to the surface on which the camera unit is mounted via a predetermined number of ball bearings. A tilt movable member that has a second upright portion that is vertically upright and is spaced apart from the first upright portion, and that is movable in the vertical plane as a whole; Of the flat plate portion of the flat plate portion standing upright from the flat third flat plate portion arranged opposite to the surface opposite to the surface connected in close proximity to the first flat plate portion. A tilt base member that transmits a vibration vibration, and a first upright portion and a second upright portion. And a plurality of rod-shaped first piezoelectric elements extending in a straight line direction in the horizontal plane direction, and a second flat plate portion and a third flat plate portion, and a vertical plane direction. And a plurality of rod-shaped second piezoelectric elements extending in a straight line direction when the vibration vibration is transmitted to the tilt base member. Generated by compression / extension associated with the direction of vibration Applying the opposite polarity value of the DC voltage to the compressed / expanded one based on the DC voltage, subjecting it to expansion / compression, and controlling the posture of the pan movable member so as to cancel the compression / extension Thus, the first flat plate portion is maintained at a fixed position in the horizontal plane direction, and the plurality of second piezoelectric elements have the inclination of the vibration vibration in the vertical plane direction of the tilt movable member when the vibration vibration is transmitted to the tilt base member. Based on the DC voltage generated by the accompanying compression / expansion, the reverse polarity value of the DC voltage is applied to the compression / expansion, respectively, and subjected to expansion / compression, and the tilt so as to cancel the compression / expansion. By controlling the attitude of the movable member, the first flat plate portion is maintained at a fixed position in the vertical plane direction.

  According to the camera unit shaking prevention mechanism of the present invention, the pan movable member having a flat plate portion mounted on the camera unit is coupled to the tilt movable member via the ball bearing and the horizontal plane direction adjusting piezoelectric element. The tilt movable member is coupled to the tilt base member with a ball bearing and a vertical surface direction adjusting piezoelectric element interposed, and when the shaking vibration is transmitted to the tilt base member, the tilt of the pan movable member in the horizontal plane direction, Alternatively, based on the DC voltage generated by compression / extension in the horizontal plane direction adjustment and vertical plane direction adjustment piezoelectric element accompanying the tilt of the tilt movable member in the vertical plane direction, the reverse polarity values of those DC voltages are respectively set. By applying to each piezoelectric element and stretching and compressing it, it is possible to maintain the flat plate portion at a fixed position in the horizontal plane direction and the vertical plane direction. Therefore, even when the camera unit that does not have the shake correction function is mounted on the camera housing mounted on the electric pan head, it is possible to effectively correct the shake vibration caused by the external force applied to the camera housing. It becomes like this.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which showed schematic structure of the shake prevention mechanism for camera units which concerns on Example 1 of this invention, (a) is the perspective view from the diagonally forward direction which mounted the shake prevention mechanism for camera units in the camera unit, (B) is a front view of the mounting state from the front direction, (c) is a perspective view from the diagonally upward side of the entire camera unit shaking prevention mechanism. FIG. 1A and FIG. 1B are side views of the camera unit when the vibration is generated in the mounted state shown in FIG. 1A and FIG. It is. FIG. 3 is a voltage change characteristic diagram showing a state of a voltage change relating to a vertical plane direction adjustment piezoelectric element in an inclined state shown in FIG. 2 in relation to a time transition.

  The camera unit shake prevention mechanism of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an external view showing a schematic configuration of a camera unit shaking prevention mechanism 3 according to a first embodiment of the present invention. FIG. 1 (a) shows that the camera unit shaking prevention mechanism 3 is mounted on the camera unit 1. FIG. 4B is a front view of the mounting state from the front direction, and FIG. 3C is a perspective view of the entire camera unit shaking prevention mechanism 3 from the diagonally upward direction. .

  Referring to FIGS. 1A to 1C, the camera unit shaking prevention mechanism 3 is added to the camera housing 2 with respect to the camera unit 1 mounted on the camera housing 2 mounted on the electric head. This is attached to the camera housing 2 so as not to transmit the shaking vibration generated by the external force to the camera unit 1.

  Referring to FIG. 1 (c), the camera unit shaking prevention mechanism 3 itself has a first upright portion 5 b erected vertically from a flat first flat plate portion 5 a for mounting the camera unit 1. The whole pan movable member 5 movable in the horizontal plane direction is connected in close proximity to a surface of the first flat plate portion 5a opposite to the surface on which the camera unit 1 is mounted via a predetermined number of ball bearings. A tilt that has a second upright portion 6b that stands vertically from the flat second flat plate portion 6a and is spaced apart from the first upright portion 5b and that is movable in the vertical plane direction as a whole. From the movable third member 6 and the flat third flat plate portion 7a arranged opposite to the surface opposite to the surface connected to the first flat plate portion 5a of the second flat plate portion 6a in the vicinity. A predetermined number of balls standing vertically and between the second standing part 6b The third upright portion 7b is connected in close proximity via the alling, and the tilt base member 7 to which the vibration is transmitted is coupled to the first upright portion 5b and the second upright portion 6b. In addition, the two rod-shaped first piezoelectric elements 8 and 9 extending in a straight line direction in the horizontal plane direction and the second flat plate portion 6a and the third flat plate portion 7a are respectively coupled to each other and vertically A plurality of rod-like second piezoelectric elements 10 and 11 extending in a straight line direction in the plane direction are assembled and configured.

  Among these, the first piezoelectric elements 8 and 9 are based on the DC voltage generated by the compression / extension caused by the inclination of the shaking vibration in the horizontal plane direction in the pan movable member 5 when the shaking vibration is transmitted to the tilt base member 7. By applying a reverse polarity value of a direct current voltage to the compressed / expanded ones, and subjecting them to expansion / compression, and controlling the posture of the pan movable member 5 so as to cancel the compression / extension, the first flat plate portion 5a Is maintained at a fixed position in the horizontal plane direction. Further, the second piezoelectric elements 10 and 11 are based on the DC voltage generated by the compression / extension caused by the tilt of the swing vibration in the vertical plane direction in the tilt movable member 6 when the swing vibration is transmitted to the tilt base member 7. By applying a reverse polarity value of a DC voltage to the compressed / expanded ones, and subjecting them to expansion / compression, and controlling the posture of the tilt movable member 6 so as to cancel the compression / extension, the first flat plate portion 5a Is maintained at a fixed position in the vertical plane direction. Here, the first piezoelectric elements 8 and 9 and the second piezoelectric elements 10 and 11 can be exemplified by using direct acting actuators.

  That is, the camera unit shaking prevention mechanism 3 has a biaxial structure of pan (horizontal plane direction) and tilt (vertical plane direction), and the standing portion 7b of the tilt base member 7 and the tilt movable member 6 stand up. A schematic bearing unit using an angular ball bearing is mounted between the portion 6b and the members are coupled to each other, thereby preloading the inner ring and ensuring a large working point distance. That is, here, in a state where the camera unit shake prevention mechanism 3 is mounted on the camera unit 1, as shown in FIG. 1B, a moment load is greatly applied in the moment load direction M in the vertical plane direction. Implementation is effective. Similarly, a bearing unit is mounted between the flat plate portion 5a of the pan movable member 5 and the flat plate portion 6a of the tilt movable member 6 to couple the members. As a result, as shown in FIG. 1B, when the shaking vibration is generated and transmitted to the tilt base member 7, the pan movable member 5 is tilted in the horizontal plane direction A1, and the tilt movable member 6 is tilted in the vertical plane direction A2. The first and second piezoelectric elements 8 and 9 suppress the rotational movement that causes the tilt in the horizontal plane direction A1, and the second piezoelectric element causes the rotational movement that causes the tilt in the vertical plane direction A2. It can be suppressed by the elements 10 and 11. The first piezoelectric elements 8 and 9 are arranged at positions symmetrical to the center line (one axial direction on the horizontal plane) of each member in a state where the pan movable member 5 and the tilt movable member 6 are assembled. The second piezoelectric elements 10 and 11 are also arranged at positions symmetrical to the center line (one axial direction on the vertical plane) of each member in a state where the tilt movable member 6 and the tilt base member 7 are assembled. Yes.

  FIG. 2 shows the camera unit shake prevention mechanism 3 and the camera unit 1 mounting portion of the camera unit 1 in the vertical downward direction A3 around the fulcrum when the shake vibration is generated in the mounting state shown in FIGS. 1 (a) and 1 (b). It is the external appearance side view which showed the inclination. Here, in the camera unit shaking prevention mechanism 3, when the tilting occurs in the vertical plane lower direction A3 included in the vertical plane direction A2 when the shaking vibration is generated, the second piezoelectric elements 10 and 11 rotate the tilt. An operation for suppressing the above will be described.

The second piezoelectric elements 10 and 11 (the same applies to the first piezoelectric elements 8 and 9) are generally known as elements that expand when a DC voltage is applied and conversely generate a DC voltage when compressed by an external force. Yes. As shown in FIG. 2, when the tilt movable member 6 is rotated by being transmitted to the tilt base member 7 when the vibration is oscillated to cause the tilt in the vertical direction A3, the piezoelectric element 10 is compressed and the DC voltage −V1 is applied. The piezoelectric element 11 expands to generate a DC voltage + V1. The second piezoelectric elements 10 and 11 (the same applies to the first piezoelectric elements 8 and 9) are configured so that the electric circuit is always maintained at the reference voltage. Since + V1 is applied to expand and the piezoelectric element 11 is compressed by applying a DC voltage −V1 , the length of the second piezoelectric elements 10 and 11 is constant, and the flat plate portion 6a of the tilt movable member 6 is a tilt base. The flat plate portion 7a of the member 7 and the first flat plate portion 5a of the pan movable member 5 are maintained in parallel. As a result, the first flat plate portion 5a of the pan movable member 5 is maintained at a fixed position in the vertical plane direction.

FIG. 3 is a voltage change characteristic showing the state of voltage (V) change related to the second piezoelectric elements 10 and 11 for adjusting the vertical plane direction in the tilted state shown in FIG. 2 in relation to time (t) transition. FIG. In FIG. 3, when the vibration is transmitted to the tilt base member 7 when the vibration is generated and the inclination in the vertical direction A3 is generated, the piezoelectric element 10 is compressed during the period of the voltage change ΔV1 generated by the vibration and the DC voltage − V1 is generated, and the piezoelectric element 11 expands in a similar voltage change ΔV1 period to generate a DC voltage + V1 , and a DC voltage is applied to the piezoelectric element 10 in a voltage change ΔV2 period for the electric circuit to return to the reference voltage. A state in which + V1 is applied and expanded and a DC voltage −V1 is applied to the piezoelectric element 11 and compressed is shown. Due to the functions of the first piezoelectric elements 10 and 11, the first flat plate portion 5a of the pan movable member 5 is maintained at a fixed position in the vertical plane direction. In the case where the vibration is transmitted to the tilt base member 7 when the vibration is generated and the vertical plane is inclined, the reverse of the generation and application pattern of the DC voltage related to each of the piezoelectric elements 10 and 11 described here. In this case, similarly, the first flat plate portion 5a of the pan movable member 5 is maintained at a fixed position in the vertical plane direction.

  In addition, in the camera unit shaking prevention mechanism 3, the first piezoelectric elements 8 and 9 suppress the tilt when tilting in the horizontal front side direction or the heel side direction included in the horizontal plane direction A1 when the shaking vibration is generated. In any case, the first flat plate portion 5a of the pan movable member 5 is maintained at a fixed position in the horizontal plane direction.

  As described above, according to the camera unit shaking prevention mechanism 3 according to the first embodiment, when the shaking vibration is transmitted to the tilt base member 7, the tilt of the pan movable member 5 in the horizontal plane direction, or the tilt movable member 6 is perpendicular. Based on the DC voltage generated by the compression / extension in the first piezoelectric elements 8 and 9 for adjusting the horizontal plane direction and the second piezoelectric elements 10 and 11 for adjusting the vertical plane direction due to the inclination in the plane direction, Is applied to each of the piezoelectric elements 8 to 11 and stretched / compressed to cancel each other (the pan movable member 5 and the tilt movable member 6 are controlled in posture) to be mounted on the camera unit 1. Since the flat plate portion 5a of the pan movable member 5 can be maintained at a fixed position in the horizontal plane direction and the vertical plane direction, the camera unit 1 having no shake correction function is mounted on the electric pan head. Also the use environment that implements the Managing 2, shake correcting shaking vibration generated by an external force applied to the camera housing 2 can be effectively perform.

  Note that the camera unit shaking prevention mechanism 3 according to the first embodiment includes an outer wall of a camera mounting member 2 ′ extending in the optical axis direction of the lens of the camera unit 1, as shown in FIGS. 1 (a) and 1 (b). Although the case where the flat plate portion 5a of the pan movable member 5 is mounted near the center of gravity holding the camera unit 1 on the side surface has been described, depending on the specifications of the camera mounting member 2 ′, the outer wall side surface of the camera mounting member 2 ′ It may be difficult to mount the camera unit shaking prevention mechanism 3. In such a case, the camera unit shake prevention mechanism 3 can be waterproof and can be inserted between the camera platform 2 and the camera housing 2 (not shown). However, when the camera unit shake prevention mechanism 3 is mounted between the camera platform 2 and the camera housing 2, not only the flat plate portion 5a of the pan movable member 5 but also the second piezoelectric member in the flat plate portion 7a of the tilt base member 7 is used. The surface opposite to the surface to which the elements 10 and 11 are coupled is also used for mounting, and the pan movable member 5 and the first piezoelectric elements 8 and 9 for adjusting the horizontal plane direction and the tilt movable member 6 depending on the assembled form. The tilt base member 7 may function as a pan base member while the relationship with the second piezoelectric elements 10 and 11 for adjusting the vertical plane direction is reversed. Since the surface does not change, it can be regarded as the same structure. Further, in the camera unit shake prevention mechanism 3 according to the first embodiment, the case where two piezoelectric elements are used for horizontal plane direction adjustment and vertical plane direction adjustment is illustrated, but three or more piezoelectric elements are used. Therefore, the camera unit shaking prevention mechanism 3 of the present invention is not limited to the one disclosed in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Camera unit 2 Camera housing 2 'Camera mounting member 3 Shaking prevention mechanism for camera units 5 Pan movable member 5a 1st flat plate part 5b 1st standing part 6 Tilt movable member 6a 2nd flat plate part 6b 2nd standing part 7 Tilt base member 7a Third flat plate portion 7b Third upright portion 8, 9 First piezoelectric element 10, 11 Second piezoelectric element

Claims (2)

A camera unit shaking prevention mechanism that reduces shaking vibrations generated by an external force applied to the camera housing mounted on the camera housing mounted on the electric head,
It has a first upright portion which is substantially vertically erected from the first flat plate portion for mounting the camera unit, the whole movable bread movable member in the horizontal plane direction, before Symbol the camera of the first flat plate portion A second unit is arranged to stand substantially vertically from a flat plate portion connected to a surface opposite to the surface on which the unit is mounted via a predetermined number of ball bearings, and is spaced apart from the first standing portion. a second flat plate portion having a standing portion, while each coupling between the front Symbol said second upright portion and the first upright portion, and a plurality of piezoelectric elements arranged in a horizontal plane direction, composed of two And
The plurality of piezoelectric elements are based on a DC voltage generated by compression / extension associated with a tilt of the vibration vibration in the horizontal plane direction in the pan movable member when the vibration vibration is transmitted to the first or second flat plate portion. By applying a reverse polarity value of the direct current voltage to the compressed / expanded ones for expansion / compression, and controlling the posture of the pan movable member so as to cancel the compression / extension, the first A camera unit shaking prevention mechanism, wherein the flat plate portion of the camera unit is movable so as to be maintained at a fixed position in the horizontal plane direction. A camera unit shaking prevention mechanism that reduces shaking vibrations generated by an external force applied to the camera housing mounted on the camera housing mounted on the electric head,
A pan movable member that has a first upright portion that stands substantially vertically from a first flat plate portion for mounting the camera unit and is movable in the horizontal plane direction, and the camera unit of the first flat plate portion Is arranged to stand substantially vertically from a second flat plate portion connected to a surface opposite to the surface on which the first mounting portion is mounted via a predetermined number of ball bearings, and is spaced apart from the first standing portion. with a second upright portion, the entire movable tilt movable member in the vertical plane direction, and the second of said first surface to be connected in close proximity to the flat plate portion of the flat plate portion surface opposite and facing A third upright portion that rises substantially vertically from a third flat plate portion that is spaced apart and is connected to the second upright portion via a predetermined number of ball bearings , and a tilt base member shaking vibration is transmitted before Symbol first standing portion With respectively coupled between said second upright portion, coupling a plurality of first piezoelectric elements arranged in a horizontal plane direction, and the second flat plate portion between the third flat plate portion respectively And a plurality of second piezoelectric elements arranged in the vertical plane direction are assembled and configured,
It said plurality of first piezoelectric element, said when the shake vibration to the tilt base member is transmitted, based on the DC voltage generated by the compression and expansion due to inclination of the rocking vibration of the horizontal plane direction of the pan movable member By applying a reverse polarity value of the direct current voltage to the compressed / expanded ones for expansion / compression, and controlling the posture of the pan movable member so as to cancel the compression / extension, the first maintaining the flat plate portion in position in the horizontal plane direction,
The plurality of second piezoelectric elements are based on a DC voltage generated by compression / extension associated with the tilt of the swing vibration in the vertical plane direction in the tilt movable member when the swing vibration is transmitted to the tilt base member. By applying a reverse polarity value of the direct current voltage to the compressed / expanded ones for expansion / compression, and controlling the posture of the tilt movable member so as to cancel the compression / extension, the first the camera unit for shake prevention mechanism of the flat plate portion, characterized that you maintained in position in the vertical plane direction.

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