JP5418075B2 - Photography lens drive control device and imaging device - Google Patents

Description

  The present invention relates to a photographic lens drive control device and an image pickup apparatus including the photographic lens drive control device, and more specifically, part or all of a lens group is off the photographic optical axis when the lens barrel is retracted. The present invention relates to an improvement in drive control of a so-called retracting lens group that is moved to a retracted position.

  In recent compact digital cameras, the non-objective lens group is retracted from the photographing optical axis (the optical axis at the time of photographing) for the purpose of reducing the thickness when the lens barrel is retracted. Some adopt a so-called retracting retractable lens barrel having a structure in which a rear space (image-side space) is secured and the objective lens group is accommodated in the obtained space.

  Here, as a structure for retracting the non-objective lens group from the photographing optical axis, for example, a lens group frame that holds the non-objective lens group at the outer periphery thereof, from a rotation axis provided in parallel with the photographing optical axis. A structure in which an extended arm member is connected and the arm member swings (rotates) around a rotation axis is used (Patent Document 1).

Incidentally, those having a structure in which a lens group described above can be retracted from the photographing optical axis shifts, for example, by a preparatory operation for starting the actual imaging operation start operation, in a state feeding the lens barrel from the collapsed state At the same time, it is necessary to move the lens group from a retracted position deviated from the photographing optical axis to a standby position (a position ready for photographing) on the photographing optical axis.

  In this activation operation, if the lens group is not securely arranged on the photographing optical axis, an appropriate image cannot be obtained during the photographing operation. Therefore, the specific position in the operation of the lens group is a predetermined reference position. It is defined by the amount of movement from

  However, if the lens group receives an unexpected impact or the like during the rotation operation from the retracted position to the photographic optical axis by the activation operation, the arm member is detected despite the above-described movement amount being detected normally. The actual position of the lens group may deviate from the original normal position.

  If the lens group is displaced in the plane orthogonal to the photographing optical axis in this way, the lens group cannot be moved to the correct position thereafter, and the lens group interferes with other lens groups in the lens barrel. There is a problem that not only can there be a risk of image formation, but also proper imaging cannot be obtained.

  The present invention has been made in view of the above circumstances, and provides an imaging lens drive control device and an imaging device capable of appropriately controlling the driving of a lens group even when an unexpected impact is received during a startup operation. The purpose is to do.

  Each photographing lens drive control device and imaging device according to the present invention detects the movement trajectory of the lens group at the time of activation, determines the presence or absence of abnormality in the activation operation based on the detected movement locus, and the determination result By controlling the driving of the lens driving device based on the above, the driving of the lens group is appropriately controlled even when an unexpected impact is received during the starting operation.

That is, the photographing lens driving control apparatus according to the present invention, the photographing optical axis collapsible barrel is the collapsible barrel and a retracted position retracted from the deployed that Taking Kagekojiku in the collapsed state is placed in a state feeding to be movable between the standby position location above, a lens group provided in the collapsible lens in a barrel, and a lens driving device for driving the lens group, and a control means for controlling driving of the lens driving device A movement locus detecting means for detecting a movement locus of the lens group and a distance from the retracted position to the standby position of the lens group at the time of activation based on the movement locus detected by the movement locus detecting means. and a determining activation abnormality determining means whether the activation of the operation abnormality of moving, wherein the controller, the activation abnormality determination in accordance with the determination result by the means, the drive startup of the lens driving device And characterized in that it controls.

  According to the photographic lens drive control device according to the present invention configured as described above, the control device controls the driving of the lens group by the lens drive device, and the movement locus detection means detects the movement locus of the lens group. The activation abnormality determining means determines whether there is an abnormality in the driving state of the lens group at the time of activation based on the movement locus detected by the movement locus detecting means, and the control device responds to the determination result by the activation abnormality determining means. By controlling the driving at the time of starting the lens driving device, even if the moving locus of the lens group being activated changes, the lens group is subjected to control such as returning to the normal orbit according to the change. Further, it is possible to avoid the possibility of interfering with other lens groups in the lens barrel and the possibility of obtaining appropriate image formation.

In photographing lens driving control apparatus of the present invention, the collapsible lens in a barrel, and the objective-side lens group and the object side lens group is provided, and movable between the retracted position and the front Symbol standby position location The lens group thus formed is preferably the non-objective lens group.

  According to the photographic lens drive control device according to the present invention configured as described above, the objective side lens group and the non-objective side lens group are provided in the retractable lens barrel, and the non-objective side lens is provided. Since the group is a lens group that can move between a retracted position and a position on the photographing optical axis, when the lens barrel is retracted, the non-objective lens is moved to the retracted position. Since the area occupied by the non-objective lens group on the optical axis is a non-occupied space, the objective-side lens group positioned on the object side of the non-objective lens group is further rearward (what is the object side? It is possible to move to the space in the opposite direction (image side direction), thereby effectively reducing the thickness of the optical system in the retracted state of the lens barrel.

  In the photographing lens drive control device of the present invention, when the lens group is moved by the driving by the lens driving device, the moving amount detection for obtaining the moving amount of the lens group based on the driving amount by the lens driving device. And a lens group position detecting means for detecting an actual position of the lens group, wherein the movement locus detecting means is based on the movement amount of the lens group obtained by the movement amount detection means. A plurality of monitoring points on the movement trajectory of the group are set, and based on the actual passing position of the lens group detected by the lens group position detecting unit corresponding to each of the set monitoring points. It is preferable to detect the movement trajectory.

  According to the photographic lens drive control device according to the present invention configured as described above, when the lens group is moved by the driving of the lens driving device, the movement amount detecting means uses the lens based on the driving amount of the lens driving device. The lens group position detection means detects the actual position of the lens group, and the movement locus detection means moves the lens group based on the lens group movement amount obtained by the movement amount detection means. A plurality of monitoring points on the locus are detected, and the movement locus is simplified based on the actual passing position of the lens group detected by the lens group position detecting unit corresponding to each of the detected monitoring points. Can be detected automatically.

  That is, although it is not possible to detect the entire spatially continuous movement trajectory, it is possible to determine the spatial position at a plurality of monitoring points discretely set on the movement trajectory, It is possible to obtain a moving trajectory that can be practically used to determine whether or not there is an abnormality in the orbital motion while drastically reducing the amount of calculation.

  In the photographing lens drive control device of the present invention, the lens group is held by a holding frame, and the holding frame is connected to a moving member that moves integrally with the holding frame at least along the direction of the photographing optical axis. The lens group position detecting means is fixed so that the reflecting member provided on the moving member faces the reflecting member in a posture state where the moving member moves along the photographing optical axis direction. A photoreflector fixed to the portion, receiving light reflected by the reflecting member out of light emitted from the photoreflector, and based on the amount of received light in the direction of the photographing optical axis of the lens group It is preferable to detect the passing position along.

  According to the photographic lens drive control device according to the present invention configured as described above, the lens group position detection means is arranged along the photographic optical axis direction in accordance with the output of the photo reflector (output signal corresponding to the amount of received light). The actual position of the moving lens group can be reliably detected.

  In the photographing lens drive control device of the present invention, when the lens group is located at a position where the lens group enters the photographing optical axis from the retracted position, the light receiving light amount by the photo reflector is maximized. A photo reflector is preferably arranged.

  According to the photographic lens drive control device according to the present invention configured as described above, when the movement amount detection means is to indirectly obtain the movement amount of the lens group with the drive amount of the lens group drive device, When the lens group driving device steps out, the movement amount detection means cannot detect the movement amount of the lens group, so the actual position of the lens group cannot be obtained. Since the reflecting member and the photoreflector are arranged so that the amount of light received by the photoreflector is maximized when it is at the position (optical axis position) where the light enters, the position where the output signal of the photoreflector becomes maximum The reference (optical axis position) of the actual position of the lens group can be obtained.

  Further, when the lens group is at the optical axis position, the amount of received light is maximum at this position because it is the rearmost (image side) position in the range in which the lens group moves along the photographing optical axis. By setting the positional relationship between the reflecting member and the photoreflector in this way, the light receiving dynamic range of the photoreflector can be effectively used to the maximum, and the detection accuracy of the amount of received light can be increased.

  In the photographic lens drive control device of the present invention, when the received light quantity detected by the photoreflector when the lens group is at a position entering the photographic optical axis is a reference light quantity, It is preferable that the movement trajectory detecting means obtains the trajectory of the lens group based on the ratio of the amount of received light detected by the photo reflector at the monitoring point.

Here, the output signal of the photo reflector is in accordance with the amount of received light, and the amount of received light is in accordance with the distance between the photo reflector and the reflecting member.
Light reception detected by the photoreflector at a plurality of monitoring points with respect to the reference light amount when the received light amount detected by the photoreflector is the reference light amount when the lens group is at the position (optical axis position) where the lens group enters the photographing optical axis Based on the ratio of the amount of light, the distance between the photo reflector and the reflecting member can be obtained.

  On the other hand, the monitoring point is obtained by the movement amount detection means, and when the lens group driving device steps out, a position (lens group position) different from the regular monitoring point is detected as the monitoring point.

  Therefore, according to the photographing lens drive control device according to the present invention having the above-described configuration, whether the position of the monitoring point is a normal position by obtaining the distance between the photo reflector and the reflecting member at each monitoring point. Whether the position is wrong can be determined, and as a result, the correctness of the locus of the lens group detected by the movement locus detecting means can be determined.

  In the photographic lens drive control device of the present invention, the activation abnormality determination means compares the movement locus detected by the movement locus detection means with a preset normal movement locus, thereby determining whether or not the abnormality exists. It is preferable to determine this.

  According to the photographic lens drive control device according to the present invention configured as described above, the activation abnormality determination means compares the movement locus detected by the movement locus detection means with a preset normal movement locus. Therefore, it is not necessary to obtain a regular movement trajectory to be compared with the movement trajectory detected by the movement trajectory detection means every time comparison is performed, and the regular movement trajectory is compared. Compared with the case where it is obtained every time the control is performed, the calculation load required for it can be reduced.

In photographing lens driving control apparatus of the present invention, the control device, the activation when the abnormality determination means determines abnormality and suspends the start operation against the lens by the lens driving device wherein It is preferable that the lens driving device is controlled so as to perform a start-up reset that restarts the start-up operation from the beginning.

  According to the photographic lens drive control device according to the present invention configured as described above, when the start abnormality determination unit determines that there is an abnormality, the control device interrupts the start operation for the lens group by the lens drive device and starts up. By controlling the lens driving device so that the activation reset is performed again from the beginning, the lens group trajectory may be caused by continuing the activation operation even though the locus of the lens group is not a normal locus, etc. Occurrence of interference and inappropriate imaging can be effectively avoided, and the startup operation along the normal locus can be executed by executing the startup operation again.

  In the photographic lens drive control device of the present invention, when the control device determines that there is an abnormality during the restart operation period due to the start reset, the control device performs the start reset again. The lens driving device is preferably controlled.

  According to the photographic lens drive control device according to the present invention configured as described above, when the control device determines that there is an abnormality during the restart operation period due to the start reset, the start reset is performed again. By controlling the lens driving device so as to perform a normal start operation that obtains a normal trajectory can be repeated until the normal start operation is realized, it is possible to finally obtain a start operation without abnormality. .

  In the photographing lens drive control device of the present invention, when the control abnormality determination unit determines that there is an abnormality during the reactivation operation period by the activation reset, the activation reset is repeated and this activation is repeated. When the number of resets exceeds a predetermined number, it is preferable to stop the activation operation without performing the activation reset.

  According to the photographing lens drive control device according to the present invention configured as described above, when the control device determines that there is an abnormality during the reactivation operation period due to the activation reset, the activation reset is performed. Repeatedly, when the number of activation resets exceeds a predetermined number, the activation operation is stopped without performing activation reset, so that it is possible to prevent the activation operation from being repeated indefinitely.

In photographing lens driving control apparatus of the present invention, the retracted position and the front Symbol lens driving device for driving a movable and lenses group between the standby position location is preferably a pulse motor.

  According to the photographic lens drive control device according to the present invention configured as described above, the lens drive device that drives the lens group that is movable between the retracted position and the position on the photographic optical axis is a pulse motor. Since the amount of movement of the lens group can be obtained by counting the number of pulses supplied to the pulse motor, the position of the lens group is determined based on the number of pulses when obtaining the locus of this lens group. Can be identified.

  In addition, an imaging apparatus according to the present invention includes, on a housing, any one of the above-described photographing lens drive control devices according to the present invention, and an imaging unit that projects an object image by the lens group of the photographing lens drive control device. It is provided with.

  According to the imaging device according to the present invention configured as described above, the photographing lens drive control device exhibits the action and effect of the above-described photographing lens drive control device according to the present invention, so that it remains in a step-out state. Proper shooting can be prevented.

  According to the photographing lens drive control device and the imaging device according to the present invention, it is possible to prevent interference between the lens groups while simultaneously driving a plurality of lens groups constituting the photographing lens by respective separate driving devices. .

It is a block diagram which shows the photographic lens drive control apparatus which concerns on embodiment (Examples 1-3) of this invention. It is the figure which represented typically the positional relationship of 1-2 group and 3 groups, (a) is a state in which 1-2 group is a storing position, and 3 group is a retracted position, (2) is 1-2 group The third group is in the retracted position while moving toward the object side along the photographic optical axis, and (3) is the third group in the state where the optical axis position is moved while the first and second groups are moved toward the object side along the photographic optical axis. Represents each state. It is a figure which shows starting operation | movement of 3 groups when it sees from the object side, (a) shows the operation | movement which rotates, (b) shows the operation | movement which moves linearly, respectively. (A) is an external view which shows the state which the lens barrel was extended, (b) is a figure which shows the position (optical axis position) of 3 groups in the state where the lens barrel was extended. It is a table | surface which shows the positional infomation on 1-2 group. It is a figure which shows the relationship between the position of 1-2 group, and a reference position signal. It is a figure which shows the relationship between the position of 3 groups, and a reference position signal. It is a principal part perspective view which shows starting operation | movement of 3 groups, (a) The state which exists in a retracted position, (b) is the state which exists in an optical axis position, (c) is the state which moved along the imaging | photography optical axis, Respectively. It is a principal part side view which shows starting operation | movement of 3 groups, (a) The state which exists in a retracted position, (b) is the state which exists in an optical axis position, (c) is the state which moved along the imaging | photography optical axis, Respectively. It is a schematic diagram explaining the operation | movement which detects the reference position of 3 groups, (a) is a state in which 3 groups exist in a retracted position, (b) is an optical axis through 3 groups through a reference position (two-dot chain line). Each of the states in position is shown. It is the table | surface which represented the specific position of locus | trajectory CP of 3 groups by the pulse number from a reference position. It is a diagram showing an example of the locus | trajectory from the reference position of 3 groups to a standby position, (1) is a locus | trajectory by normal operation, (2) is when stepping out in the range from a retracted position to a reference position Trajectory, (3) is the trajectory when stepping out on the photographic optical axis (range between the optical axis position and position), (4) is the optical axis position passing due to unexpected impact after passing through the optical axis position Represents the trajectory when stepped back to the previous position. It is a timing chart which shows the process of a photographic lens drive control apparatus. It is a flowchart which shows the processing content of a photographic lens drive control apparatus. It is a principal part perspective view which shows the example in case an optical system is a 4 group structure.

  Embodiments of a photographing lens drive control device according to the present invention will be described below with reference to the drawings.

(Constitution)
FIG. 1 is a block diagram showing a configuration of a photographic lens drive control device 100 according to an embodiment of the present invention. For example, an imaging element (imaging means) such as a CCD or CMOS and a photosensitive film such as a photosensitive film in a housing. It is used for an imaging device such as a camera that projects an image of a subject (object) condensed by a photographing lens onto a material (imaging means).

  The photographing lens 1 includes three lens groups each having a plurality of lenses, and is arranged in order of the first lens group, the second lens group, and the third lens group from the objective side. Here, the first lens group and the second lens group are attached to a cam cylinder (not shown) in which the distance between both lens groups (first lens group, second lens group) is mechanically adjusted by a cam mechanism. When the first and second lens groups are driven by a motor, which will be described later, the distance between the two lens groups is set in advance according to the driven position. It is comprised so that it may become a set interval.

  Hereinafter, the 1-2 lens group is the 1-2 group 1A (objective side lens group), the third lens group is 3 group 1B (lens group, non-objective side lens group), the first lens group is 1 group, the second A description will be given assuming that two lens groups are used.

  The first-second lens group 1A and the third lens group 1B are arranged in the lens barrel 1D with the same optical axis. Here, between the first-second lens group 1A and the third lens group 1B, the first diaphragm 2A and the second diaphragm 2B for controlling the amount of light passing from the subject into the photographing lens 1, and the exposure time at the time of photographing are controlled. A shutter 3 is installed.

  The first-second lens group 1A is a zoom lens group for changing the photographing magnification. The third lens group 1B focuses an image of a subject on an exposure surface (not shown) located behind the third lens group 1B. This is a focusing lens group.

  Each lens group 1A, 1B is driven by a separate motor to move along the optical axis, thereby constituting an optical system for purposes (for zooming and focusing), respectively.

  Here, the lens barrel 1D is a collapsible lens barrel that is housed in the housing of the imaging device when not in use in a state of being incorporated in the imaging device described above, and the third group 1B includes a lens barrel as will be described later. When the lens barrel 1D is retracted, the lens barrel 1D is retracted from the photographing optical axis. When the lens barrel 1D is extended, the lens barrel 1D is moved from the retracted position onto the photographing optical axis and then travels straight along the photographing optical axis. It is configured to perform retraction driving.

  The positional relationship between the 1-2 group 1A and the 3 group 1B is schematically shown in FIG. 2A shows a state in which the first-second lens group 1A is at the retracted position on the photographing optical axis, and FIG. 2B shows a state in which the first lens group 1B is at the retracted position off the photographing optical axis. The state in which the group 1A is moved to the object side on the photographic optical axis and a space for arranging the third group 1B is formed on the photographic optical axis. FIG. The figure shows the state of moving on a photographing optical axis (located at the optical axis position) in a plane orthogonal to the.

  That is, the optical system (1-2 group 1A, 3 group 1B) in the present embodiment is in a non-shooting state such as when an image pickup apparatus such as a camera equipped with the taking lens drive control device 100 is carried, as shown in FIG. As shown in a), when the third group 1B is in the retracted position off the photographing optical axis, the storage position of the first-second lens group 1A is retracted to a position closer to the image side on the photographing optical axis. Since it can be set as a structure, the thickness along the optical axis direction in the retracted state (non-photographing state) in which the first-second lens group 1A is accommodated can be reduced.

  When shifting from this non-photographing state to the photographing state, first, the first-second lens group 1A is advanced toward the object (subject) side along the photographing optical axis as shown in FIG. As a result, an entry space for the third group 1B on the photographing optical axis is secured, and then the third group 1B is moved to the optical axis position on the photographing optical axis as shown in FIG. An in-focus state is obtained by moving the group 1B along the photographing optical axis.

  On the other hand, in the transition from the photographing state to the retracted state, contrary to the above order, the third group 1B on the photographing optical axis is moved to the retracted position outside the photographing optical axis, and then the first group 1-2A is photographed. Retreat along the axis to return to the stowed position.

  FIG. 3 is a schematic view of the above-described operation of the third group 1B (operation of moving from the retracted position to the optical axis position) as viewed from the image side of the imaging optical axis. (Moving along an arcuate trajectory), (b) shows moving along a linear trajectory. In the present embodiment, the third group 1B is described as rotating as shown in (a), but the present invention is not limited to this operation, and moves straight ahead as shown in (b). There may be.

  FIG. 4 is a main part external perspective view showing an example of an external appearance of the lens barrel 1D and a state of the third group 1B provided in the lens barrel 1D (a virtual state in which the lens barrel 1D is removed for convenience of explanation). FIG. However, in FIG. 5B, the third group 1B shows a state on the photographing optical axis (a state where the lens barrel 1D is extended).

  Here, the third group 1B uses the third group frame 1B1 and the arm 1B2 that hold the third group 1B by movement of a gear-connected lead screw (not shown) and a nut (not shown) as a photographing optical axis. You can move forward and backward.

  As shown in FIG. 8 to be described later, the third group 1B is held by an arm portion 1B2 and a third group frame 1B1 that are supported by a main shaft O extending along the photographing optical axis direction, and is located behind the photographing optical axis. Photographed in a state in which the compression torsion spring having a function of urging (image side) and a function of urging to rotate around the photographing optical axis is in contact with a sub-axis extending in parallel with the main axis O. A straight movement (advance and retreat) is possible along the optical axis.

  When the nut moves to the rear of the photographic optical axis, if the nut hits the collision surface of the rear part of the arm 1B2, the engagement with the arm 1B2 is disengaged and the movement further proceeds.

  There is a cam surface behind the nut engaging surface of the arm portion 1B2, and when the nut engages with the cam surface and moves backward, the arm portion 1B2 rotates in a direction against the torsional force of the compression torsion spring, Retreat from the shooting optical axis.

  The lens barrel 1D accommodates the first-second lens group 1A and the shutter 3 in the space obtained by retracting the arm portion 1B2 to the outside of the rotary cylinder and retracting the third-group frame 1B1, so that the thickness when the lens barrel 1D is accommodated is reduced. The thickness (thickness along the photographing optical axis direction) is reduced.

  When an optical system having four groups behind the three groups is employed, the fourth group is housed between the shutter 3 and the image sensor.

  Contrary to the above, when the lens barrel 1D is activated, the rotating cylinder is first rotated to feed the first-second lens group 1A and the shutter 3 forward, and then the third-group motor 4B is rotated to rotate the nut to the photographing optical axis. Move along the direction.

  At this time, the arm 1B2 is applied with a rotational force in the direction toward the photographing optical axis by the torsional force of the torsion spring, so that the cam surface engages with the nut and enters in the direction on the photographing optical axis. Is possible.

  When entering on the photographing optical axis, the arm portion 1B2 of the third group 1B engages with the auxiliary shaft, and thereby further rotation is restricted, and as a result, the optical axis of the third group 1B coincides with the photographing optical axis. It becomes.

  When the nut further moves in the direction of the photographing optical axis, the nut disengages from the cam surface, engages with the front engaging surface, and moves the arm portion 1B2 forward (object side) along the photographing optical axis. Can do. The nut stops when the pulse motor rotates by a predetermined amount, and the third group 1B is arranged at the standby position to complete the starting operation.

  Normally, this starting operation allows the third group 1B to move stably to an arbitrary position. However, if an inertial force acts in the direction opposite to the rotation direction of the arm 1B2 at the time of starting, the torsion spring is attached. Even though the force is defeated by this inertial force and the third group 1B has not entered the photographing optical axis, the nut has reached the front engaging portion, and the position (trajectory) of the third group 1B has shifted. In spite of this, the third group 1B is extended along the photographing optical axis.

  At this time, conventionally, the arm portion 1B2 or the like may interfere with the fixed cylinder (base) or the like, and the movement of the third group 1B may be stopped. In addition, the arm 1B2 is formed with a protrusion (see FIG. 8, etc.) used in combination with a photo interrupter for detecting the reference position immediately after activation. After passing through the reference position, Since step-out cannot be detected, there is a possibility of destruction due to focal length shift, focus shift, interference, or the like.

  The first-second lens group driving motor 4A for driving the first-second lens group 1A is a DC motor (direct current motor), and the third lens group driving motor 4B (lens driving device) for driving the third lens group 1B is a pulse motor (drive). (The mechanism is not shown).

  The DC motor is a lens driving device in which the driving speed changes according to the applied driving voltage, and the driving speed of the first-second lens group 1A can be adjusted by a simple operation by changing the applied voltage. .

  In general, a DC motor can be rotated at a higher speed than a pulse motor if the supplied power is the same, and the drive current changes in accordance with load fluctuations. For example, the load increases. As a result, the drive current increases and, as a result, the drive torque increases. Therefore, it is possible to obtain a smooth operation with excellent adaptability to load fluctuations. Therefore, for example, it is suitable for driving a cam cylinder in which the cam inclination changes (load torque changes) according to the zoom position.

  The DC motor is also a lens driving device whose driving speed changes according to a duty ratio (ratio of on-state time in the cycle), and changes the ratio of driving energization time input to the lens driving device, that is, the duty ratio. The drive speed of the first-second lens group 1A can be adjusted with a simple operation.

  On the other hand, when the DC motor is stopped, due to inertia, a shift from the stop control to the actual stop, so-called overrun is likely to occur, and it may be difficult to stop at the desired position. In this respect, since the pulse motor is driven by giving a pulse, it is easy to stop at an arbitrary target position. However, since the adaptability to the torque fluctuation is not as good as that of the DC motor, the torque fluctuation is small. Suitable for drive control.

  The first diaphragm 2A, the second diaphragm 2B, and the shutter 3 are provided with a first diaphragm motor 4D, a second diaphragm motor 4E, and a shutter motor 4F for driving the first diaphragm 2A, the second diaphragm 2B, and the shutter 3, respectively. The corresponding first diaphragm 2A, second diaphragm 2B, and shutter 3 are driven by the operations of 4E and 4F (the drive mechanism is not shown). All the motors 4A to 4F described above are electrically connected to a motor driver 5A (a part of the control device) and subjected to intensive control.

  The motor driver 5A receives information necessary for driving and controlling each of the motors 4A to 4F from the electrically connected CPU 5B (part of the control device, movement amount detection means, activation abnormality determination means), for example, drive voltage, A drive timing, a drive amount, a drive direction, etc. are obtained, and drive control of each motor 4A-4F is performed based on these information.

  Here, the first-second lens group driving motor 4A includes a first-second lens group moving amount detection device 7 that generates a number of pulses corresponding to the number of rotations as the motor 4A rotates. The first-second group movement amount detection device 7 is driven by an electrically connected first-second group movement amount detection device drive circuit 8. The pulse output from the first-second group movement amount detection device 7 is input to the CPU 5B.

  The first-second group movement amount detection device 7 is provided coaxially with a rotating portion of a drive transmission system such as a rotating shaft of the first-second lens group driving motor 4A and rotates together with the rotating portion at every predetermined rotation angle. It is possible to apply a rotary encoder composed of a disc in which a light transmitting portion and a light shielding portion are repeatedly formed, and a photo interpreter provided facing the light transmitting portion of the disc, The output pulse of the rotary encoder becomes a predetermined number such as 1600, for example, between when the photographic lens 1 is in the most telephoto state (telephoto end) and when in the widest angle state (wide angle end). Is set.

  Then, the entire interval between when the telephoto state is the most telephoto state and when the wide angle state is the most wide-angle state is divided into a predetermined number (for example, 16 equal intervals) (1 equal interval every 100 pulses), A position index, so-called zoom position Zp12 (N), is set for each of the 17 divisions (N) that define the 16 sections.

  FIG. 5 shows the relationship between the output pulse of the first-second group moving amount detection device 7 and each zoom position Zp12 (1), Zp12 (2),..., Zp12 (17) of the first-second group 1A.

  The number of pulses shown in FIG. 5 is counted as a positive value with the reference position set to 0, and is counted as a negative value when counting in the direction from the reference position toward the storage position. Specifically, the count of the number of pulses at the storage position is “−600” as shown in FIG.

  On the other hand, the third group motor 4B is driven at a driving speed according to the pulse rate input from the motor driver 5A according to the instruction from the CPU 5B.

  Further, the first-second lens group 1A and the third lens group 1B are respectively provided with a first-second lens group reference position detection device 9A and a third lens group reference position detection device 9B for detecting the respective reference positions. It is detected whether 1A and 1B are at the reference position.

  FIG. 6 shows the correspondence between the position of the first-second lens group 1A and the reference position detection signal by the first-second lens group reference position detection device 9A.

  Here, the reference position of the first-second lens group 1A is provided between the storage position (see FIG. 2) and the zoom position Zp12 (1) which is the end on the wide angle side. The positions Zp12 (1), Zp12 (2), ..., Zp12 (17) are set based on this reference position.

  Similarly, FIG. 7 shows the correspondence between the position of the third group 1B and the reference position detection signal by the third group reference position detection device 9B. The reference position, standby position, trajectory CP1, trajectory CP2, trajectory CP3, trajectory CP4, and closest position in FIG. 7 will be described below.

  As shown in FIG. 8, the third group 1B is held by a third group frame 1B1 (holding frame). The arm group 1B2 (moving member) whose one end is pivotally supported by the rotation axis O is supported by the third group frame 1B1. The other end sides of these are connected. The arm portion 1B2 is rotated about the rotation axis O by the driving of the third group motor 4B ((a) → (b) in the same figure) and linearly moved along the photographic optical axis ((b) in the same figure (b). ) → (c)) of FIG.

  Further, the arm portion 1B2 is formed with a light-shielding projection 1B3 projecting outward, and when the third group 1B is in the retracted position (see FIGS. 2A and 2B), FIG. ) And the third group 1B as seen from the side (direction orthogonal to the photographing optical axis) as shown in FIG. 9A and FIG. 10A as a schematic view, the projection 1B3 of the arm portion 1B2 is formed. Then, a light shielding state is interposed between the light emitting portion and the light receiving portion of the photo interrupter (PI) fixed to a fixed frame or the like of the imaging device.

  On the other hand, on the trajectory in which the third group 1B moves from the retracted position to the optical axis position (see FIG. 2C) (FIG. 8 (a) → FIG. 8 (b), FIG. 9 (a) → FIG. 8 (b)). Thus, as shown in FIG. 10B, the three protrusions 1B3 are separated from between the light emitting portion and the light receiving portion of the photointerrupter, whereby the photointerrupter is in a translucent state.

  The reference position of the third group 1B shown in FIG. 7 is defined as the position when the projection 1B3 is detached from the photo interrupter and the output (reference position signal) of the photo interrupter rises, and the retraction position (FIG. 2). (See (a)), the position when set on the photographing optical axis (optical axis position: FIG. 2 (c)), etc. are set by the number of pulses of the third group motor 4B from this reference position. Yes.

  Further, the standby position in FIG. 7 is a state where the optical axis of the third group 1B is coincident with the optical axis of the first group 1-2, that is, when the third group 1B is on the photographing optical axis. It is set as a position where preparation is complete and the focus operation can be immediately started.

  Furthermore, the closest position in FIG. 7 is a case where the third group 1B is on the photographing optical axis, and is set as a position where the third group 1B is closest to the object side.

  The range along the imaging optical axis between the standby position and the closest position is the moving range (imaging range) of the third group 1B used in the imaging operation (image obtaining operation).

  In addition, the photographing lens drive control device 100 of the present embodiment includes a third group movement locus detection device 9C (a movement locus detection means, a part of the lens group position detection means) that detects the movement locus of the third group 1B. The movement locus of the third group 1B is detected by the third group movement locus detection device 9C.

  The movement trajectory of the third group 1B is, for example, the time when the third group motor 4B is driven by a predetermined number of pulses with respect to the reference position (see FIG. 7) of the third group 1B (see FIG. 7) (the trajectory checkpoint ( The actual position of the third group 1B in the trajectory CP)) is detected, and the CPU 5B has a plurality of different trajectories CP (in this embodiment, four trajectories CP1, trajectory CP2, trajectory CP3, trajectory CP4). 3) by comparing and comparing the normal position (assumed to be stored in advance) where each of the three groups 1B should originally exist and the actual position of the three groups 1B. It is determined whether 1B is moving normally along a trajectory (whether a regular trajectory is drawn).

  Here, a specific configuration of the third group movement locus detection device 9C in the present embodiment will be described below.

  That is, on the rear surface (surface facing the image side) of the arm portion 1B2 connected to the above-described third group frame 1B1, FIG. As shown in FIG. 8C, a reflection sheet (a part of the lens group position detection means, a reflection member) is provided, while the fixed part (base, etc.) of the lens barrel 1D has a fixed portion (base, etc.) as shown in FIG. As shown in FIGS. 9A and 9C and FIG. 9B and FIG. 9C, a photo reflector (a part of the lens group position detecting means) including a light emitting part and a light receiving part is provided. This photo reflector emits light from the light emitting section, and when the light receiving section receives the reflected light of the emitted light, it outputs a signal corresponding to the received light quantity. Is detected (position along the photographing optical axis).

  In this embodiment, since the third group 1B is located at the optical axis position, the reflecting sheet provided on the arm portion 1B2 and the fixed photo reflector are disposed so as to face each other. When the third group 1B is at the optical axis position, a signal indicating light reception is output from the photo reflector, and when the third group 1B moves along the photographing optical axis, the distance between the reflection sheet and the photo reflector is As it expands (the third group 1B is extended toward the object side (moved toward the object side along the imaging optical axis)), the output signal of the photoreflector becomes smaller, and between the reflection sheet and the photoreflector As the distance decreases, the output signal of the photo reflector increases.

  Note that the output signal of the photoreflector is maximized when the third group 1B is at the optical axis position.

  Four trajectories CP (monitoring points) are set in the present embodiment, and the first trajectory CP (trajectory CP1) coincides with the optical axis position of the third group 1B, and from the reference position to the optical axis position. It is set by the number of pulses of the third group motor 4B.

  At this time, the output signal of the photoreflector becomes maximum, but when the value of this output signal is 100%, the position of the output signal value of the photoreflector corresponding to 50% of the output signal value in the locus CP1 (shooting light) The second locus CP (trajectory CP2) is set by the number of pulses of the third group motor 4B from the reference position corresponding to the position along the axis closer to the object side than the optical axis position).

  In addition, the value of the output signal of the photoreflector from the reference position corresponding to the position corresponding to 20% of the output signal value in the locus CP1 (position closer to the object side than the locus CP2 along the photographing optical axis). The third locus CP (trajectory CP3) is set according to the number of pulses of the third group motor 4B.

  Further, the fourth trajectory CP (trajectory CP4) is determined by the number of pulses of the third group motor 4B from the reference position, which coincides with the standby position that is closer to the object side than the trajectory CP3 along the photographing optical axis. ) Is set.

  As described above, when the third group 1B is moved by the driving by the third group motor 4B, the CPU 5B obtains the movement amount of the third group 1B based on the driving amount (number of pulses) by the third group motor 4B. It functions as a quantity detection means.

  The number of pulses of the third group motor 4B from the reference position corresponding to the reference position of the third group 1B, the locus CP1 (optical axis position), the locus CP2, the locus CP3, and the locus CP4 (standby position), for example, is shown in FIG. 11 is set.

  The above-described first-second group reference position detection device 9A, third-group reference position detection device 9B, and third-group movement trajectory detection device 9C correspond to the first-second group reference position detection device driving circuit 10A and the third-group reference position detection respectively. It is driven by the device drive circuit 10B and the third group movement locus detection device drive circuit 10C.

  The information on the position or locus detected by each of the reference position detection devices 9A and 9B and the third group movement locus detection device 9C is driven by the corresponding reference position detection device driving circuit 10A or 10B or the third group movement locus detection device. The signal is input to the CPU 5B via the circuit 10C.

  The third group movement locus detection device drive circuit 10C outputs a signal corresponding to the amount of light received by the photoreflector as a voltage value for the position of the third group 1B. Therefore, the CPU 5B to which this voltage value has been input is input. The position of the third group 1B in each locus CP (information representing the discrete locus of the third group 1B) is obtained by A / D converting the obtained voltage value.

  FIG. 12 is a diagram showing an example of the trajectory of the third group 1B from the reference position of the third group 1B to the standby position, and the trajectory of the third group 1B detected in the present embodiment is It is a position (position along the photographing optical axis) in each locus CP. In the present invention, the detection accuracy of the trajectory may be improved by setting more trajectories CP than in the present embodiment and detecting the positions at narrower spatial intervals.

  In FIG. 12, (1) is a trajectory in normal operation, (2) is a trajectory when stepping out in a range from the retracted position to the reference position, and (3) is on the photographing optical axis (optical axis position). (4) is the trajectory when stepped out after passing through the optical axis position and returned to the position before passing the optical axis position due to unexpected impact, etc. Respectively.

  The CPU 5B includes a telephoto switch (indicated as telephoto SW in FIG. 1) 6A operated to increase the magnification of the photographing lens 1 when performing telephoto shooting, and the magnification of the photographing lens 1 when performing wide-angle photographing. A wide angle switch (indicated as wide angle SW in FIG. 1) 6B that is operated to reduce the magnification is electrically connected, and the CPU 5B controls the motors 4A, 4A for each group according to the operation of the telephoto switch 6A and the wide angle switch 6B. 4B is controlled.

  The motor driver 5A and the CPU 5B described above constitute a control device 5 (control device).

  The first group and the second group constituting the first-second group 1A are attached to a cam cylinder (not shown) in which the distance between the two lens groups (first group, second group) is mechanically adjusted by a cam mechanism. When the first-second group 1A is driven by the first-second group motor 4A, the first-group and second-group motors are mechanically driven so as to have a predetermined distance.

  In addition, a temperature sensor 5C that detects the ambient temperature is connected to the CPU 5B. The temperature sensor 5C outputs a voltage value corresponding to the detected temperature, and the CPU 5B acquires temperature information by A / D converting the output voltage value.

Since the temperature sensor 5C in this embodiment has a characteristic that the voltage changes by 10 [mV] with respect to the temperature of 1 [degree], the voltage value at a known temperature is stored in advance. Depending on the difference between the stored voltage value and the voltage value detected at any time, the temperature at that time can be determined.
(Function)
Next, among the actions of the photographic lens drive control device 100 of the present embodiment, the startup operation of the third group 1B that moves the lens barrel 1D from the retracted state to the extended state (standby state) will be described with reference to the timing chart of FIG. explain.

  First, when the control of the lens barrel 1D is started, initial setting of the system including the lens barrel 1D is started. As an initial setting, initialization of the motor driver 5A for driving each motor 4A, 4B, 4D, 4E, 4F, each group reference position detection device 9A for detecting the position and locus of the first-second group 1A, the third group 1B, The initialization of 9B and the third group movement locus detection device 9C is performed.

  Next, the reference position is detected by the first-second lens group reference position detection device 9A and the reference position is detected by the third lens group reference position detection device 9B. The detection result by the first-second lens group reference position detection device 9A is changed from the storage position to the reference position. (The reference position signal (HP (home position) signal) is the L level range in FIGS. 6 and 13 (1)), and the detection result by the third group reference position detection device 9B is the retraction position. To the reference position (in FIG. 7, FIG. 13 (4), the reference position signal (HP (home position) signal) is an L level range), the first-second lens group 1A is wide (wide-angle end). The motor driver 5A drives the first-second lens group driving motor 4A so as to move in the direction (FIG. 13 (3)).

  As the first-second lens group driving motor 4A is driven, a pulse signal (PI signal; FIG. 13 (2)) is output from the rotary encoder (photo interpreter) attached to the first-second lens group driving motor 4A. The movement amount detection device 7 detects the drive amount of the first-second lens group driving motor 4A by counting the number of edges of the output pulses, and the detection result is the first-second group movement amount detection device driving circuit. 8 to the CPU 5B.

  Note that the first-second group movement amount detection device 7 itself may only generate pulses, and the CPU 5B may count the number of pulses without counting the number of generated pulses.

  The motor driver 5A is for the first-second group in order to prevent an inrush current from the first-second group motor 4A that is a DC motor during a predetermined period (start-up period) immediately after the first-second group motor 4A is started. As shown in FIG. 13 (3), the voltage (drive voltage) for driving the motor 4A is lower than the voltage (steady voltage; for example, 3.8 [V]) during steady driving (for example, 2.0 [V]). V]), and after the start-up period has passed, the drive voltage is increased to a steady voltage to drive the first-second lens group driving motor 4A.

  Subsequently, when the CPU 5B and the motor driver 5A have elapsed 50 [msec] after the startup of the first-second lens group motor 4A (the number of pulses is calculated in terms of the number of pulses of the PI signal (FIG. 13 (2))). Then, the shutter motor 4F is driven (FIG. 13 (6)), and the shutter 3 is set to a fully open state.

  Subsequently, as shown in FIGS. 13 (7) and 13 (8), the CPU 5B and the motor driver 5A control the diaphragms 2A and 2B by the diaphragm motors 4D and 4E, and use these diaphragms 2A and 2B as intermediate diaphragms. Set to state.

  The shutter motor 4F and the aperture motors 4D and 4E are driven during the drive period of the first-second lens group motor 4A. The shutter motor 4F, the aperture motors 4D, 4E and the first-second lens group are driven. The motor 4A is in a simultaneous drive state.

  When the driving of the diaphragm motors 4D and 4E is completed, the process waits for the reference position to be detected by the first-second lens group reference position detector 9A.

  The reference position (HP) of the first-second lens group 1A is a position where the reference position signal (HP signal) from the first-second lens group reference position detector 9A has changed from the L level to the H level, as shown in FIG. When the first-second lens group reference position detection device 9A detects the reference position based on the reference position signal (FIG. 13 (1)), the position information of the first-second lens group 1A (the pulse count of the PI signal) is reset. .

  Then, the first-second group movement amount detection device 7 counts the number of pulses of the PI signal (FIG. 13 (2)) from this reference position, and the counted number of pulses corresponds to the wide-angle position (Zp12 (1)). When the number of pulses of the PI signal (200 pulses in the present embodiment in FIG. 4) is reached, the motor driver 5A stops the first-second lens group driving motor 4A and the first-second lens group 1A is moved to the wide-angle position (Zp12 (1) ).

  Here, the wide-angle position (Wide position) is determined in advance as shown in FIG. 5, but such a setting is applied to a nonvolatile memory such as an EEPROM (electrically erasable PROM: Programmable ROM). By storing it, it can be rewritten later and can be changed.

  Further, since the first-second lens group driving motor 4A is a DC motor as described above, the mere driving control (switching from the driving voltage 3.8 [V] to 0 [V]) is appropriately performed at the target stop position. There is an overrun that stops at a position that has passed the position of the stop target without stopping.

  Therefore, in the present embodiment, in the preset range before the wide-angle position (Zp12 (1)), the amount of overrun is suppressed by controlling the drive voltage in a stepwise manner to reduce the overrun amount. Including the control to stop at the target position (wide angle position).

  That is, the period of the predetermined specified number of pulses before reaching the wide-angle position (200 pulses) is set as the stop control period, and as shown in FIG. 13 (3), it depends on the number of remaining pulses up to the wide-angle position. Thus, the drive voltage is lowered stepwise to 2.0 [V] and 1.5 [V].

  The stop control of the first-second lens group driving motor 4A by the CPU 5B and the motor driver 5A is based on the number of pulses of the PI signal detected by the first-second lens group moving amount detection device 7.

  Further, in this stop control, when the counted number of pulses of the PI signal becomes 200 pulses corresponding to the wide-angle position, in order to completely stop the driving of the 1-2 group 1A, the 1-2 group motor Brake control is performed to brake 4A. Note that the rotation amount during the braking control period is also estimated in advance, and finally the first-second lens group 1A is stopped at the wide-angle position, which is the stop target position, without overrun.

  When the first-second lens group reference position detection device 9A detects the reference position based on the reference position signal (FIG. 13 (1)), the CPU 5B and the motor driver 5A are configured to move the third lens group 1B toward the standby position. Control to start driving of the group motor 4B (FIG. 13 (5)) is performed.

  At this time, since the first-second lens group driving motor 4A is also driven, the third-group motor motor 4B and the first-second lens group driving motor 4A are driven in parallel. The CPU 5B and the motor driver 5A perform control to drive these motors 4A and 4B simultaneously.

  At this time, the driving time of the third group 1B is shortened by setting the pulse rate for driving the third group motor 4B faster than the normal driving.

  When driving of the third group motor 4B is started, the third group reference position detection device 9B waits to detect the reference position of the third group 1B. Since the reference position (HP) of the third group 1B is a position where the reference position signal (HP signal) by the third group reference position detecting device 9B has changed from the L level to the H level as shown in FIG. When the reference position detection device 9A detects the reference position based on the reference position signal (FIG. 13 (4)), the position information of the third group 1B is once reset to zero, and from the reference position to the standby position (trajectory CP4). The third group motor 4B is driven with the corresponding number of pulses (500 pulses in the present embodiment as shown in FIG. 11), and the third group 1B is set at the standby position. Stop.

  Here, the standby position (trajectory CP4) is predetermined as shown in FIG. 11, but such a setting can be rewritten later by storing it in a nonvolatile memory such as an EEPROM, for example. Changes are possible.

  Among the first-second group motor 4A, the third group motor 4B, the first diaphragm motor 4D, the second diaphragm motor 4E, and the shutter motor 4F, the first-second group motor 4A, which is a DC motor, Since the required current value in the steady state is the lowest of these motors 4A, 4B, 4D, 4E, 4F, a motor other than the first-second group motor 4A and the first-second group motor 4A When it is necessary to drive at the same time, the motors other than the first-second lens group driving motor 4A are controlled to be driven simultaneously with the steady driving period of the first-second lens group driving motor 4A having the lowest required current value. Has been.

  That is, the combination in which the two motors are driven at the same time is, specifically, the steady driving period of the first-second lens group driving motor 4A and the simultaneous driving of the shutter motor 4F, and the stationary driving period of the first-second lens group driving motor 4A. Simultaneous driving with the first diaphragm motor 4D, simultaneous driving period of the first-second lens group motor 4A and the second driving motor 4E, or stationary driving period of the first-second lens group motor 4A and third-group motor 4B or simultaneous driving with 4B.

  In the present embodiment, the current value at the time of steady driving of the first-second group motor 4A that is a DC motor is about 125 mA, the third-group motor 4B that is a pulse motor is about 185 mA, the shutter motor 4F is about 160 mA, both The aperture motors 4D and 4E are about 200 mA each.

  Next, an activation control method for driving the third group 1B from the retracted position to the standby position by the photographing lens drive control device 100 of the present embodiment will be described with reference to the flowchart of FIG.

  First, the reference position is determined by the third group reference position detector 9B (step 1 (S1)). When the third group reference position signal (FIG. 13 (5)) is at the H level, it is determined that the third group 1B is in the non-retracted state (the state that is not at the retracted position), and the retreat process is performed (S9). The contents of the evacuation process are to temporarily move the third group 1B to the evacuation position. Thereafter, the reference position of the third group 1B of S1 is further determined. The evacuation process itself is not directly related to the object and configuration of the present invention, and a detailed description thereof will be omitted.

  When the third group reference position signal (FIG. 13 (5)) is at the L level, it is determined that the third group 1B is in the retracted state, and the activation process is performed (S2). Specifically, the CPU 5B and the motor driver 5A drive and control the third group motor 4B so that the third group motor 4B is driven toward the optical axis position.

  Thereafter, it is determined whether or not the third group reference position has been detected by the third group reference position detection device 9B (S3).

  While the third group motor 4B is being driven, the position of the third group 1B is monitored by counting the drive pulses of the third group motor 4B, but before the third group 1B reaches the reference position, it is counted. Whether or not the number of pulses reached a predetermined number of pulses set in advance corresponding to the distance from the retracted position to the reference position, that is, until the third group 1B reaches the reference position from the retracted position. The number of pulses counted during the period should match the specified number of pulses.

  Therefore, before the third group 1B reaches the reference position (when it is not detected in S3), the counted number of pulses (drive control amount) is set in advance from the retracted position to the reference position. It is determined whether or not the specified number of pulses has been reached (S10).

  In step 10, when the counted number of pulses exceeds the prescribed number of pulses (S10), that is, when the prescribed number of pulses is counted, the third group reference signal does not change to H (third group 1B). If the third group 1B does not reach the reference position), it can be determined that there is a possibility that the third group 1B has performed an operation deviating from the normal orbit in the orbit range between the retracted position and the reference position.

  Accordingly, when the CPU 5B and the motor driver 5A do not detect the reference position within the prescribed number of pulses from the retracted position, the CPU 5B and the motor driver 5A perform error processing (S11). The error processing here stops the driving of the third group motor 4B.

  On the other hand, when the CPU 5B and the motor driver 5A detect the reference position within the prescribed number of pulses from the retracted position, the counted number of pulses is temporarily reset to zero, and the third group 1B is moved from the reference position to the standby position ( The CPU 5B and the motor driver 5A drive and control the third group motor 4B so that the third group motor 4B moves to the number of pulses required for the movement from the reference position to the standby position by 500 pulses) (S4).

  Then, by counting the number of pulses (drive control amount) supplied to the third group motor 4B (S5), the position of the third group 1B (movement amount from the reference position (drive control amount)) is monitored.

  The third group movement trajectory detection device 9C is a third group in the direction along the photographing optical axis of four trajectories CP1 (optical axis position), trajectory CP2, trajectory CP3, and trajectory CP4 provided from the reference position to the standby position. Each position of 1B is detected, and whether the trajectory of the third group is normal or abnormal is determined (S6, S12).

  Specifically, between the reflective sheet provided on the rear surface (surface facing the image side) of the arm portion 1B2 extending from the third group frame 1B1 that holds the third group 1B and the photo reflector provided on the fixed portion. Since the magnitude of the output signal from the photoreflector changes according to the distance, the third group movement trajectory detection device 9C causes the normal signal values (the trajectory is normal) in each trajectory CP1, trajectory CP2, trajectory CP3, and trajectory CP4. In this case, the value of the signal to be output (a value stored in advance as a voltage value after A / D conversion) and the actual output signal value (trajectory value (voltage value A / D) By comparing and collating the value after D conversion) = physical quantity representing the actual position), it is determined whether the position of each locus CP1, locus CP2, locus CP3, locus CP4 of the third group 1B is normal or abnormal. .

  Another determination of normal or abnormal is performed by the CPU 5B by comparing and collating the normal signal value and the trajectory value in each trajectory CP1, trajectory CP2, trajectory CP3, and trajectory CP4. The difference between the signal value and the trajectory value is a preset abnormal threshold value (a threshold value set in advance as suitable for determining whether normal or abnormal, and this threshold value is the third group movement trajectory detection device 9C. This is a value that takes into account errors due to variations in the signal output of the sensor (photo reflector, etc.), and variations in the position along the photographing optical axis caused by the difference in attitude of the lens barrel 1D. It is determined as normal, and when the difference between the normal signal value and the trajectory value is equal to or greater than a preset abnormality threshold, it is determined as abnormal.

  Here, when an impact force or the like is applied to the third group 1B, and the third group 1B deviates from the trajectory that should normally pass (FIG. 12 (1)), depending on the position of the third group 1B when deviating from the original trajectory. The third group 1B draws, for example, the locus (solid line) shown in FIGS. 12 (2), (3), and (4).

  Then, the CPU 5B converts the trajectory values (represented as “signal values” represented by solid lines in FIG. 12) in the trajectories CP1, trajectory CP2, trajectory CP3, and trajectory CP4 into the normal trajectories (FIG. 12 (1)). Compared with the signal values in the trajectory CP1, trajectory CP2, trajectory CP3, and trajectory CP4, it is determined whether the trajectory (position in each trajectory CP) of the third group 1B is normal or abnormal.

In this embodiment, another determination of whether the position of the third group 1B is normal or abnormal starts from a locus CP1 having the smallest number of pulses from the reference position (closest to the reference position), and hereinafter, a locus CP2, This is performed in the order of the trajectory CP3 and the trajectory CP4.
<Basic flow of startup process for 3 groups (normal)>
First, the CPU 5B compares and compares the normal signal value and the trajectory value in the trajectory CP1 to determine whether the position (trajectory) of the third group 1B in the trajectory CP1 is normal or abnormal (S12), and is determined to be normal. If it is, the standby position detection determination (determination as to whether or not the standby position (trajectory CP4) as the stop position has been reached) is performed (S7). At the time when the trajectory is determined in the trajectory CP1, the third group 1B has not reached the standby position that coincides with the trajectory CP4. At this time, the determination result indicates that the standby position is not detected (S7). Returning to the monitoring of the drive control amount of the third group 1B (S5: counting of the number of pulses), the detection of the locus CP2 which is the next determination position is awaited (S6).

  When the trajectory CP2 that is the next determination position is detected (S6), the CPU 5B compares the normal signal value with the trajectory value in the trajectory CP2, and normalizes the position (trajectory) of the third group 1B in the trajectory CP2. Then, the abnormality is determined (S12), and if it is determined to be normal, the standby position detection determination (determination of whether or not the standby position (trajectory CP4) as the stop position has been reached) is subsequently performed ( S7). At the time when the trajectory is determined in the trajectory CP2, the third group 1B has not reached the standby position that coincides with the trajectory CP4. At this time, the determination result indicates that the standby position is not detected (S7). Returning to the monitoring of the drive control amount of the third group 1B (S5: counting the number of pulses), the detection of the locus CP3 which is the next determination position is awaited (S6).

  When the trajectory CP3 which is the next determination position is detected (S6), the CPU 5B compares and compares the normal signal value in the trajectory CP3 with the trajectory value, and the position of the third group 1B (trajectory) in the trajectory CP3 is normal. Then, the abnormality is determined (S12), and if it is determined to be normal, the standby position detection determination (determination of whether or not the standby position (trajectory CP4) as the stop position has been reached) is subsequently performed ( S7). At the time when the trajectory is determined in the trajectory CP3, the third group 1B has not reached the standby position that coincides with the trajectory CP4. At this time, the determination result indicates that the standby position is not detected (S7). Returning to the monitoring of the drive control amount of the third group 1B (S5: counting the number of pulses), the detection of the locus CP4 which is the next determination position is awaited (S6).

When the trajectory CP4 which is the next determination position is detected (S6), the CPU 5B compares and collates the normal signal value with the trajectory value in the trajectory CP4, and the position of the third group 1B (trajectory) in the trajectory CP4 is normal. Then, the abnormality is determined (S12), and if it is determined to be normal, the standby position detection determination (determination of whether or not the standby position (trajectory CP4) as the stop position has been reached) is subsequently performed ( S7). Since the third group 1B has reached the standby position coinciding with the trajectory CP4 when the trajectory is determined in the trajectory CP4, the determination result indicates that the standby position has been detected (S7), and the third group 1B. The third group motor 4B is driven and controlled so as to stop at the standby position, and the third group start-up process before photographing ends.
<Basic flow of start-up process of 3 groups (when it is determined abnormal in any trajectory CP)>
Whether the position (trajectory) of the third group 1B in each locus CP described above is normal or abnormal is determined (S12), and if determined to be abnormal, the CPU 5B stops driving the third group 1B (S14). The driving of the third group motor 4B is controlled.

  Thereafter, the number of resets is determined in the activation reset determination (S14), and if the number of resets is within a predetermined number of times set in advance, after waiting for one second (S16), the save processing of the third group 1B is performed (S17).

  In the evacuation process for the third group 1B, the evacuation process is performed if the third group 1B has returned to the photographing optical axis (if the reference position signal is at the H level), and is not returned (if the reference position signal is at the L level). If there is any) wait until the reference position signal becomes H level, and after it becomes H level, save processing is performed.

  After the evacuation process (S17), the process returns to the determination of the reference position of the third group 1B in step 1 and starts again from the beginning.

When the number of resets determined in the start reset determination (S14) exceeds a preset number of preset times, an error process is performed (S15), and the process ends. In the error process, the driving of the third group motor 4B is stopped.
<Processing flow according to specific step-out>
<In the case of abnormality determination in the locus CP1>
Here, first, when step-out occurs in the retreat area from the reference position of the third lens group 1B to the optical axis position, the third lens group 1B draws a locus as shown in FIG. 12 (2). Since the difference between the trajectory value in the trajectory CP1, which is the point, and the signal value in the normal trajectory (FIG. 12 (1)) is equal to or greater than the abnormal threshold, the trajectory of the third group 1B is determined to be abnormal (S12), and the CPU 5B The driving of the third group motor 4B is controlled so as to stop the driving of the group 1B (S14).

  Thereafter, the number of resets is determined in the activation reset determination (S14), and if the number of resets is within a predetermined number of times set in advance, after waiting for one second (S16), the save processing of the third group 1B is performed (S17).

  In the evacuation process for the third group 1B, the evacuation process is performed if the third group 1B has returned to the photographing optical axis (if the reference position signal is at the H level), and is not returned (if the reference position signal is at the L level). If there is any) wait until the reference position signal becomes H level, and after it becomes H level, save processing is performed.

  After the evacuation process (S17), the process returns to the determination of the reference position of the third group 1B in step 1 and starts again from the beginning.

When the number of resets determined in the start reset determination (S14) exceeds a preset number of preset times, an error process is performed (S15), and the process ends. In the error process, the driving of the third group motor 4B is stopped.
<In the case of abnormality determination in the locus CP2>
Further, when the third group 1B steps out on the photographing optical axis (the range between the optical axis position and the position), the third group 1B draws a trajectory as shown in FIG. Since there is no abnormality in the trajectory CP1, which is the first check point, the difference between the trajectory value in the trajectory CP1 and the signal value in the normal trajectory (FIG. 12 (1)) is less than the abnormal threshold.

  Accordingly, the trajectory determination process (S12) in the trajectory CP1 becomes normal, and it is detected whether or not the third group 1B has reached the standby position (S7), and the driving of the third group 1B is continued (S5). Waits until the path CP2 is reached (S6).

  In the case of step-out on the photographing optical axis (range from the optical axis position to the position) shown in FIG. 12 (3), the locus value in the locus CP2 which is the next check point and the signal value in the normal locus ( Since the difference from FIG. 12A is equal to or greater than the abnormality threshold, the locus of the third group 1B is determined to be abnormal (S12), and the CPU 5B stops the driving of the third group 1B (S14). The drive of 4B is controlled.

  Thereafter, the number of resets is determined in the activation reset determination (S14), and if the number of resets is within a predetermined number of times set in advance, after waiting for one second (S16), the save processing of the third group 1B is performed (S17).

  In the evacuation process for the third group 1B, the evacuation process is performed if the third group 1B has returned to the photographing optical axis (if the reference position signal is at the H level), and is not returned (if the reference position signal is at the L level). If there is any) wait until the reference position signal becomes H level, and after it becomes H level, save processing is performed.

  After the evacuation process (S17), the process returns to the determination of the reference position of the third group 1B in step 1 and starts again from the beginning.

When the number of resets determined in the start reset determination (S14) exceeds a preset number of preset times, an error process is performed (S15), and the process ends. In the error process, the driving of the third group motor 4B is stopped.
<In the case of abnormality determination in the locus CP3>
When the third lens group 1B returns to the position before passing the optical axis position due to an unexpected impact or the like after passing through the optical axis position, the third group 1B draws a locus as shown in FIG. 12 (4). In this case, since there is no abnormality in the trajectory CP1, which is the first check point, the difference between the trajectory value in the trajectory CP1 and the signal value in the normal trajectory (FIG. 12 (1)) is less than the abnormal threshold.

  Accordingly, the trajectory determination process (S12) in the trajectory CP1 becomes normal, and it is detected whether or not the third group 1B has reached the standby position (S7), and the driving of the third group 1B is continued (S5). Waits until the path CP2 is reached (S6).

  In addition, since there is no abnormality in the trajectory CP2, which is the next check point, the difference between the trajectory value in the trajectory CP2 and the signal value in the normal trajectory (FIG. 12 (1)) is less than the abnormal threshold.

  Accordingly, the trajectory determination process (S12) in the trajectory CP2 is normal, and it is detected whether or not the third group 1B has reached the standby position (S7), and the driving of the third group 1B is continued (S5). Waits until the path CP3 is reached (S6).

  When the step is returned to the position before passing through the optical axis position after passing through the optical axis position shown in FIG. 12 (4), the locus value in the locus CP3 which is the next check point and the signal value in the normal locus (see FIG. 12). 12 (1)) is equal to or greater than the abnormality threshold, the locus of the third group 1B is determined to be abnormal (S12), and the CPU 5B stops the driving of the third group 1B (S14). Control the drive.

  Thereafter, the number of resets is determined in the activation reset determination (S14), and if the number of resets is within a predetermined number of times set in advance, after waiting for one second (S16), the save processing of the third group 1B is performed (S17).

  In the evacuation process for the third group 1B, the evacuation process is performed if the third group 1B has returned to the photographing optical axis (if the reference position signal is at the H level), and is not returned (if the reference position signal is at the L level). If there is any) wait until the reference position signal becomes H level, and after it becomes H level, save processing is performed.

  After the evacuation process (S17), the process returns to the determination of the reference position of the third group 1B in step 1 and starts again from the beginning.

When the number of resets determined in the start reset determination (S14) exceeds a preset number of preset times, an error process is performed (S15), and the process ends. In the error process, the driving of the third group motor 4B is stopped.
<In the case of abnormality determination in the locus CP4>
Although a specific step-out trajectory is not shown, when the trajectory is normal in the trajectory CP1, trajectory CP2, and trajectory CP3, and the trajectory of the third group 1B in the trajectory CP4 is determined to be abnormal (S12), the CPU 5B Controls the driving of the third group motor 4B so as to stop the driving of the third group 1B (S14).

  Thereafter, the number of resets is determined in the activation reset determination (S14), and if the number of resets is within a predetermined number of times set in advance, after waiting for one second (S16), the save processing of the third group 1B is performed (S17).

  In the evacuation process for the third group 1B, the evacuation process is performed if the third group 1B has returned to the photographing optical axis (if the reference position signal is at the H level), and is not returned (if the reference position signal is at the L level). If there is any) wait until the reference position signal becomes H level, and after it becomes H level, save processing is performed.

  After the evacuation process (S17), the process returns to the determination of the reference position of the third group 1B in step 1 and starts again from the beginning.

  When the number of resets determined in the start reset determination (S14) exceeds a preset number of preset times, an error process is performed (S15), and the process ends. In the error process, the driving of the third group motor 4B is stopped.

  As described above, according to the photographing lens drive control device 100 of the present embodiment, it is possible to prevent the interference between the third group 1B and the first-second group 1A to the base and the like during the start-up operation of the third group 1B. The activation operation of 1B can be completed or interrupted and terminated.

  The start-up process for the first-second lens group 1A is not directly related to the photographic lens drive control device of the present invention, and thus the description of its operation is omitted.

  In the first embodiment, another determination is made as to whether the trajectory CP is normal or abnormal during the movement of the third group 1B. The position (trajectory) is stored, and after the start-up operation of the third group 1B is completed, the positions (trajectories) in all stored trajectories CP are collated to determine whether there is an abnormality during the start-up operation. It may be.

  Furthermore, in the first embodiment, four trajectories CP are set, but the trajectory CP is not limited to four, and may be one, two, or three places smaller than this. It may be 5 or 6 or 7 or more.

  In the first embodiment described above, the photo reflector that detects the position of the arm 1B2 that holds the third group 1B (position along the imaging optical axis) has individual differences in the amount of light emitted and the light receiving sensitivity. Even so, for each photo reflector, the amount of light received at the optical axis position is set to 100%, and the amount of light received at each locus CP is defined as a ratio to the amount of light received at the optical axis position. Regardless of whether or not there is, it is possible to accurately detect the position of the third group 1B along the photographing optical axis direction.

  Further, the photoreflector is such that the third group 1B is closest to the reflection sheet when the third group 1B enters the photographing optical axis, and the third group 1B is moved away from the object side along the photographing optical axis. Since the reflection sheet and the photoreflector are arranged so as to be small, the rising of the output signal of the photoreflector at the optical axis position becomes an acute angle and onto the photographing optical axis of the third group 1B. Can be detected with higher accuracy (disposition to the optical axis position).

  In the first embodiment, the optical system has a three-group configuration, and the third group 1B that is retracted to the retracted position in the retracted state is the focusing lens group. In the present invention, the third group 1B is the focusing lens group. For example, the optical system may have a four-group configuration. In this case, for example, as shown in FIG. 15, the lens is retracted to the retracted position in the retracted state. The third group 1B may be part of the zoom lens group, and zooming may be performed by changing the relative positions of the first and second groups.

  Then, a fourth lens group (fourth group) may be arranged behind the third group 1B (image side), and these four groups may be used as a focusing lens group.

  In the case of an optical system having a 4-group configuration, 1 group is a lens group having a positive focal length, 2 group is a lens group having a negative focal length, 3 group is a lens group having a positive focal length, 4 group Can be a lens group having a positive focal length, and the fourth group may have a retracting drive structure similar to that of the third group.

  In the above-described first embodiment, when it is determined that the starting operation is abnormal due to the locus deviating from the normal position in any of the tracks CP, the starting operation is temporarily stopped and the starting operation is restarted from the beginning. When the start reset is performed and the start reset is performed a plurality of times, but the normal operation is not restored (when the start operation after the plurality of start resets is determined to be abnormal), for the third group Although the error processing (S15) for stopping the driving of the motor 4B is performed, the photographing lens drive control device according to the present invention is activated in order to perform the activation operation again when an abnormality in the activation operation is detected. It is not limited to the mode of performing the reset (the above-described first embodiment). For example, when it is determined that there is an abnormality in order to end all the processes once, after moving the third group 1B to the retracted position, 1- 2 1A to move the retracted position, to return the barrel 1D the collapsed stored state, or may be to terminate the operation.

  That is, the CPU 5B performs the evacuation process (S17) for returning the third group 1B to the evacuation position without performing the activation reset determination (S14) and the error process (S15) illustrated in FIG. Processing may be terminated. In this case, the processing content of the saving process (S17) may be the same as in the first embodiment.

  Further, after the retracting process of the third group 1B, the first-second group 1A is moved to the retracted position, thereby bringing the lens barrel 1D into the retracted retracted state, and further stopping the power supply to the photographing lens drive control device 100 itself. The power supply may be turned off (the power switch (SW) 6C is turned off).

1A 1-2 group (objective side lens group)
1B 3 groups (lens group (non-objective side lens group))
1D lens barrel (collapse type lens barrel)
4A 1-2 group motor 4B 3 group motor (lens driving device (pulse motor))
5A motor driver (control device, movement amount detection means)
5B CPU (control device, movement amount detection means)
9A 1-2 group reference position detection device 9B 3 group reference position detection device 9C 3 group movement locus detection device (movement locus detection means, lens group position detection means)
10A 1-2 group reference position detection device drive circuit 10B 3 group reference position detection device drive circuit 10C 3 group movement locus detection device drive circuit (movement locus detection means)
100 Shooting lens drive control device

JP 2006-251668 A

Claims (12)

Movable between collapsible barrel the standby position location of the shooting optical axis, wherein the collapsible lens barrel and a retracted position retracted from the deployed that shooting Kagekojiku is arranged in a state feeding the retracted state, A lens group provided in the retractable lens barrel, a lens driving device that drives the lens group, a control device that controls driving of the lens driving device, and a movement locus detection that detects a movement locus of the lens group And an activation abnormality that determines whether there is an abnormality in the activation operation that moves between the retracted position and the standby position of the lens group at the time of activation based on the movement locus detected by the movement locus detection means Determination means,
The photographic lens drive control device according to claim 1, wherein the control device controls the driving of the lens group upon activation in accordance with a determination result by the activation abnormality determination means. In the retractable lens barrel, an objective lens group and a non-objective lens group are provided,
The retracted position and the lens group that is movable between the front Symbol standby position location is photographing lens driving control apparatus according to claim 1, wherein a non-object side lens group. When the lens group is moved by driving by the lens driving device, a moving amount detecting means for obtaining a moving amount of the lens group based on a driving amount by the lens driving device, and an actual position of the lens group A lens group position detecting means for detecting,
The movement trajectory detection means detects a plurality of monitoring points on the movement trajectory of the lens group based on the movement amount of the lens group obtained by the movement amount detection means, and the plurality of detected monitoring points. The movement locus is detected based on an actual passing position of the lens group detected by the lens group position detecting unit corresponding to each of the above. Photographic lens drive control device. The lens group is held by a holding frame, and the holding frame is connected to a moving member that moves at least along the photographing optical axis direction integrally with the holding frame,
The lens group position detecting means includes a reflecting member provided on the moving member, and a non-moving part so as to face the reflecting member in a posture state in which the moving member is moving along the photographing optical axis direction. And a photo reflector fixed to the
Of the light emitted from the photo reflector, the light reflected by the reflecting member is received, and the passing position of the lens group along the photographing optical axis direction is detected based on the amount of received light. The photographic lens drive control device according to claim 3.   The reflection member and the photoreflector are disposed so that the amount of light received by the photoreflector is maximized when the lens group is in a position where the lens group enters on the photographing optical axis. Item 5. The photographing lens drive control device according to Item 4.   When the received light quantity detected by the photoreflector when the lens group is at a position entering the photographing optical axis is set as a reference light quantity, the photoreflector is detected at the plurality of monitoring points with respect to the reference light quantity. 6. The photographing lens drive control device according to claim 5, wherein the movement trajectory detecting means obtains a trajectory of the lens group based on a ratio of received light amount.   The activation abnormality determining means is configured to determine the presence or absence of the abnormality by comparing the movement locus detected by the movement locus detection means with a preset normal movement locus. The photographing lens drive control device according to any one of claims 1 to 6. Wherein the controller, when said starting abnormality determination means determines abnormality and is to perform the activation reset to interrupt the startup operation against the lens by said lens drive device again to the starting operation from the beginning The photographic lens drive control device according to any one of claims 1 to 7, wherein the photographic lens drive control device controls the lens drive device.   The control device controls the lens driving device to perform the activation reset again when the activation abnormality determining means determines that there is an abnormality during the activation operation period again due to the activation reset. The photographic lens drive control device according to claim 8.   When the control abnormality determination unit determines that there is an abnormality during the reactivation operation period due to the activation reset, the control device repeats the activation reset, and the number of activation resets is equal to or greater than a predetermined number. 9. The photographing lens drive control device according to claim 8, wherein the activation operation is stopped without performing the activation reset. The retracted position and a lens driving device for driving the movable and lenses group between the previous SL standby position location is any one of the claims 1 to 10, characterized in that the pulse motor The photographing lens drive control device described in 1.   A photographic lens drive control device according to any one of claims 1 to 11 and an imaging means for projecting an image of a subject by a lens group of the photographic lens drive control device. An imaging device that is characterized.

Images