JP4498019B2 - Optical apparatus and imaging system - Google Patents

Description

  The present invention relates to an optical device including an optical member that switches a focal length of a photographing optical system to a predetermined magnification.

  Conventionally, there are two types of extender turret control as shown in FIG.

  A motor 301 is controlled by a control circuit and rotates at a constant speed. An idler 302 is disposed between the motor 301 and the extender turret 303 in order to efficiently transmit the rotation of the motor 1 to the extender turret 303. In the extender turret 303, 1X, 2X, and CAP (light-shielding CAP) extender lenses are provided. The rotation of the motor 301 causes the extender turret 303 to rotate in the direction of the arrow A in the figure, so that 1X, CAP, 2X Insert and remove the extender lens to switch the shooting magnification (focal length). Further, the rotation and stop control of the extender turret 303 is electrically performed. At the time of stop, the stopper mechanism 331 is engaged with the click groove 330 simultaneously with the electrical stop control, and the mechanical stop means is used for reliable. Has stopped.

  FIG. 14 is a graph of the extender turret position and switching time. The vertical axis represents the position of the extender lens, and the horizontal axis represents the switching time of the extender turret 303.

  In the one-way control, if the rotation time in the case of the extender lens 2X → 1X is 1.0 sec, for example, the rotation is 1 sec. Since it passes through CAP on the way, such as 2X, it takes about twice as long as 2.0 seconds. However, since it is one-way, it can be controlled by a simple ON-OFF circuit, the circuit scale is small, and the cost can be reduced, so it is used for handy lenses, small lenses, and the like.

On the other hand, in the shortcut control, when a signal for switching from the extender command signal to the extender lens 2X is input from the state in which the extender turret 303 is set to the extender lens 1X, the CPU performs a logical operation and switches the extender lens 1X → 2X. Is controlled by determining whether the extender turret 303 is rotated forward or reverse to switch to the target extender lens. In this case, since the extender turret 303 is provided with three extender lenses, switching is performed in the same time regardless of whether it rotates forward or reverse. This short-turn control is employed in the local lens because the circuit scale is large as opposed to the single-turn control.
JP 2001-273036 A (paragraphs 0024 to 0029, FIG. 1, etc.)

  However, since the rotation of the extender turret is always controlled at a constant speed in the one-way control and the shortcut control of the conventional example, the switching time differs depending on the position of the target extender turret and the number of extender lenses. The difference in the switching time of the extender made the user feel uncomfortable.

  Further, when the extender is switched, a video in the middle of switching is displayed on the monitor, which is undesirable for the user.

  An object of the present invention is to provide an optical device and a photographing system capable of switching an optical member preferable for a user.

The optical device of the present invention, a plurality an optical system, comprising a plurality of extender lenses, a holding member which rotated about an axis parallel to the optical axis of the optical system, by driving the holding member in the rotational direction A driving means for selectively adding one of the extender lenses to the optical system, a detecting means for detecting the position of the holding member in the rotational direction, and a plurality of extender lenses selected based on the extender command signal In order to switch one extended lens from another extender lens and add it to the optical system, the controller has a control means for controlling the driving means to drive the holding member to the target position in the rotational direction . Then, even if the drive amount from the detection position by the detection unit to the target position is different, the control unit sets the drive amount so that the drive time until the holding unit reaches the target position from the detection position becomes equal. Accordingly, the drive speed of the drive means is changed.

  According to the present invention, since the driving speed is controlled according to the driving amount from the detection position to the target position, it is possible to realize an optical device that shortens the time for adding the optical member to the optical system.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram illustrating an imaging system including an extender according to the first embodiment of the present invention.

  Reference numeral 100 denotes an optical device such as a photographing lens device, and an extender turret (holding member) 3 having an extender as an optical member in an optical system constituted by a focus lens group 101, a variable power lens group 102, and a diaphragm member 103. The protrusion 106 is disposed so as to protrude. Reference numeral 105 denotes a mount, which is connected to a mount provided in the imaging apparatus 200 including the imaging element 201 such as a CCD sensor, and transmits a signal from the imaging apparatus 200 to the optical apparatus side. In this embodiment, the extender turret 3 is an integrated optical device built in the optical device 100, but is not limited thereto, and may be externally attached to the optical device 100 later. In this embodiment, the optical member is an extender, but an optical member such as an optical filter can also be applied.

  Hereinafter, the extender control in the one-way control of the present embodiment will be described.

  FIG. 4 is an arrangement and configuration diagram of the extender turret of this embodiment. Reference numeral 1 denotes a motor, and 2 an idler, which is disposed between the motor 1 and the extender turret 3 in order to efficiently transmit the rotation of the motor 1 to the extender turret 3. In the extender turret 3, extender lenses having magnifications of 1X, 2X, and 0.8X are provided, and the extender turret 3 is rotated in the direction of arrow A in the figure by the rotation of the motor 1, and the extender lenses 1X, 2X, 0.8X is inserted and removed to switch the shooting magnification (focal length). Further, the rotation and stop of the extender turret 3 are controlled electrically. At the time of stop, the stopper mechanism 31 is engaged with the click groove 30 at the same time as the electrical stop control, and the mechanical stop means is used. Has stopped.

  FIG. 2 is a block diagram of the extender drive circuit according to the embodiment of the present invention. In the figure, reference numeral 16 denotes an extender control circuit. Reference numeral 13 denotes an extender command signal from the imaging apparatus 200, and reference numeral 14 denotes an extender command signal from the lens accessory. In this embodiment, two command signals will be described, but a plurality of command signal inputs can also be handled.

  4 is a position detection circuit (potentiometer) for detecting the position of the extender turret 3, 6 is an ON-OFF motor SW for turning ON / OFF the power supplied to the motor 1, and 7 to 9 are NPN or PNP type transistors Reference numeral 10 denotes a D / A conversion circuit, 11 denotes an A / D conversion circuit, 12 denotes a control circuit (CPU), and 15 denotes an amplifier.

  First, when the command signal S1 from the extender command signal is sent to the CPU 12, the CPU 12 performs a logical operation based on the extender command signal S1 and the position information S3 of the extender turret 3 detected by the position detection circuit 4, and the extender Is output to the D / A conversion circuit 10. The switching signal S 2 is converted by the D / A conversion circuit 10 and input to the amplifier 15.

  The output from the amplifier 15 is connected to the base of the NPN transistor 9, the collector of the NPN transistor 9 is connected to the power supply, and the emitter is connected to the bases of the PNP transistor 8 and the NPN transistor 7. The NPN transistor 7 and the PNP transistor 8 are connected in a complementary pair.

  Further, the emitters of the NPN transistor 7 and the PNP transistor 8 are connected to the motor 1 via the motor SW6. The motor SW6 stops power supply to the motor 1 in conjunction with the output of the servo OFF signal S4 from the CPU 12.

  When a voltage is applied to the motor 1, the motor 1 rotates and the extender turret 3 rotates as described above. At the same time, the potentiometer, which is the position detection circuit 4, rotates to output the position information of the extender turret 3, and the position information S 3 converted via the A / D conversion circuit 11 is input to the CPU 12. Extender lenses with magnifications of 1X, 2X, and 0.8X are arranged in the extender turret 3, but other lens combinations and changes in the number of lenses can be accommodated. Since the same processing and control are performed for the switching pattern, description of all combinations is omitted.

  Next, a case where the extender lens is switched from 1X to 2X will be described with reference to a flowchart showing a main routine of processing in the CPU 12 in FIG.

  The CPU 12 also performs iris (aperture), zoom, and focus control processing for the entire optical system. In this embodiment, the extender control will be described.

  The CPU 12 receives a command signal S1 for switching to the extender lens 2X based on the extender command signal 13 from the imaging device 200 or the extender command signal 14 from the lens accessory. The CPU 12 first determines whether or not the command signal S1 is a signal from the extender lens 1X (S201). If it is a command signal for switching to the extender lens 1X, the process proceeds to S203. Otherwise, the process proceeds to step S202.

  Here, it is determined whether or not the command signal S1 is a command signal for the extender lens 2X. If the command signal S1 matches 2X, the process proceeds to step S208. Here, the command signal S1 of the extender lens 2X is compared with the position information S3, and if the position information S3 is already 2X, it is not necessary to move the extender turret 3, so the output of the extender switching signal S2 is stopped.

  If the position information S3 is other than 2X, that is, if the extender lens is 1X or 0.8X, the process proceeds to step S209, where it is determined whether or not the position information S3 of the extender turret 3 is 0.8X. In the case of 0.8X, it is determined that the extender lens in the extender turret 3 is a movement of the extender turret 3 adjacent to 0.8X → 2X, and the switching signal S2 is driven so as to drive the motor 1 at a normal driving speed. , The extender turret 3 is rotated, and the process proceeds to step S212. When the position information S3 becomes 2X, the output of the switching signal S2 is stopped.

  If the position information S3 does not match 2X in step S212, the process returns to step S209 and the same processing is repeated. If other than 0.8X in step S209, the process proceeds to step S210. That is, when the extender lens is 1X, 1X → 0.8X → 2X, and the rotation is performed via 0.8X. Therefore, the rotation amount is doubled compared to the rotation amount of 0.8X → 2X. In step S210, a switching signal S2 is output to the motor 1 so that the driving time becomes equal to 0.8X → 2X so as to rotate at twice the normal driving speed. When the position information S3 becomes 2X, the switching signal S2 is output. The output of is stopped.

  Further, the CPU 12 outputs a servo OFF signal S4 simultaneously with the stop of the switching signal S2, thereby turning off the motor SW6 so as to suppress wasteful power consumption during the stop. Further, the stopper mechanism 31 engages with the click groove 31 and stops reliably. The click groove can be shifted like the click groove 32 to eliminate the click. For example, when there is a lens that is not used in the extender turret 3, the stopper mechanism 31 can be clicked by shifting the click to eliminate it. It is possible to smooth out the switching of the extender by eliminating the time without permission.

  Next, the case where the extender lens is switched from 2X to 1X will be described.

  First, the command signal S1 of the extender lens 1X is input to step S201. In this step, it is determined whether or not the command signal S1 is 1X. In the case of 1X, the process proceeds to step S203, where the 1X command signal S1 is compared with the position information S3.

  Here, since it is assumed that the current position information of the extender turret 3 is 2X, the process proceeds to step S205. Then, the position information S3 is determined to be 2X, and the process proceeds to step S206. In this step 206, it is determined that the extender lens in the extender turret 3 is 2X → 1X, and the movement of the adjacent extender turret 3 is performed, and a process of outputting the switching signal S2 so as to rotate the motor 1 at a normal driving speed. The extender turret 3 is rotated and the output of the switching signal S2 is stopped when the position information S3 becomes 1X.

  Thus, in the present embodiment, the position of the extender turret 3 is detected by the position detection circuit 4, and the drive speed of the motor 1 is controlled according to the drive amount from the detected position to the target position.

  Specifically, as shown in FIG. 3, even when the extender turret 3 has a different rotation amount, such as when the extender lens is 1X (0.8X) → 2X, 0.8X → 2X, 2X → 1X. The rotation speed of the extender turret 3 (drive speed of the motor 1) is varied so that the switching time becomes equal to the amount of movement of the extender so that the switching time is always constant (1.0 sec).

  Therefore, by using the extender control in this embodiment also in the one-way control, there is no difference in switching time when switching from 1X (0.8X) to 2X and when switching from 2X to 1X, and the arrangement of the extender turret 3 Thus, it is possible to provide an optical device and a photographing system that can always realize a constant extender switching time without being influenced by the user and can switch the extender without stress for the user.

  FIG. 6 is a block diagram of an extender driving circuit of an imaging system including an extender according to the second embodiment of the present invention. The present embodiment is not an one-way control but an extender control in short-cut control.

  In the present embodiment, the extender control of the first embodiment is performed in the shortcut control, so the configuration is almost the same as in FIG. 1, and the description of the same reference numerals and processing is omitted.

  In FIG. 6, 16 represents an extender control circuit. For example, when the extender command signal S1 (1X → 0.8X) is sent to the CPU 12 from the state in which the current extender lens is set to 1X, the extender command signal S1 and the position information S3 of the extender turret 34 in the CPU 12. Is calculated so that the switching time from the current position (1X) of the extender turret 34 to the target position (0.8X) is minimized, and the extender switching signal S2 is output to the D / A conversion circuit 10.

  The switching signal S2 is converted through the D / A conversion circuit 10, and the signal is input to the drive circuit 33. The drive circuit 33 can rotate the motor 1 forward and backward. It is connected to the line of the motor 1 via SW6.

  FIG. 8 is a layout view of the extender turret 34 of the present embodiment. In the extender turret 34, extender lenses having magnifications of 1X, 1.5X, 0.8X, and 2X are arranged. Other lens combinations and the number of lenses can be changed.

  First, the case where the extender lens is switched from 1X to 0.8X will be described.

  When the extender command signal S1 (1X → 0.8X) is sent to the CPU 12 from the state in which the current extender lens is set to 1X, the CPU 12 changes from 1X → 1.5X → 0.8X by the shortcut control. The extender rotates. However, since a 1.5X extender lens is used here, the movement time is doubled compared to the movement time between adjacent extender lenses of 1X → 1.5X or 1.5X → 0.8X. Therefore, in the CPU 12, a switching signal S2 is output so that the motor 1 rotates at twice the normal driving speed so that the movement time becomes equal to 1X → 1.5X, and when the position information S3 becomes 0.8X. The output of the switching signal S2 is stopped.

  Next, the case where the extender lens is switched from 1X to 1.5X will be described.

  When the extender command signal S1 (1X → 1.5X) is sent to the CPU 12, the current position (1X) → target position (1.5X) in the CPU 12 based on the extender command signal S1 and the position information S3 of the extender turret 34. ) And the extender switching signal S 2 is output to the D / A conversion circuit 10.

  In this case, it is determined that the extender lens is 1X → 1.5X, and the movement of the adjacent extender turret 34 is the shortest, the motor 1 rotates counterclockwise at a normal driving speed, and the extender lens 1X → 1. When switched to 5X, the output of the switching signal S2 is stopped. In this embodiment, the click groove 30 is not provided, but the stopper mechanism 31 is brought into contact with the extender turret 34 to perform a stable stop. However, as in the first embodiment, the click groove 30 is provided. It may be provided.

  Therefore, in the present embodiment, the drive speed of the motor 1 is controlled according to the drive amount from the detected position of the extender to the target position detected as in the first embodiment.

  Specifically, as is clear from the graph of extender turret position and switching time (short cut control) shown in FIG. 7, in the case of 1X → 1.5X → 0.8X, in the case of 1X → 1.5X, 1X → 2X In this case, even when the rotation amount of the extender is different, the extender switching time is always constant (1.0 sec), and the same effects and operations as in the first embodiment are also achieved in the shortcut control.

  FIG. 9 is a block diagram of an extender drive circuit according to the third embodiment of the present invention.

  In this embodiment, when the time from the current position of the extender to the completion of movement in the first embodiment, for example, 1X → 2X, the movement of the extender lens is 1X → 0.8X → 2X. Therefore, when the extender is switched (via 0.8X), processing is performed so that the CPU 12 outputs an iris signal (CLOSE signal) S6 to the iris drive circuit 12, and the iris drive circuit 17 performs an iris based on the signal S6. The motor 18 is driven and the diaphragm member 103 is closed.

  When the extender switching operation ends, the position detection means 4 or the like detects the position of the extender turret 3 and the CPU 12 sends an iris signal (OPEN signal) S6 so that the aperture member 103 is opened (OPEN) simultaneously with the extender switching operation. Output.

  FIG. 10 is a graph of the extender turret position and switching time of this embodiment, and FIG. 11 is a graph showing the movement of the throttle member. The vertical axis represents the diaphragm of the diaphragm member 103, and the horizontal axis represents the position of the extender turret 3. As can be seen from these two graphs, it can be seen that the throttle member 103 is closed when switching from 1X to 2X (via 0.8X).

  Therefore, in this embodiment, by performing the process of forcibly closing the aperture member 103 when the extender is switched, it is possible to make the user feel inconspicuous when the extender is switched, and a smooth extender switching image is obtained. An imaging system that can be realized can be provided.

  FIG. 12 is a block diagram of an extender drive circuit according to the fourth embodiment of the present invention.

  In this embodiment, the extender switching (change) is monitored by the CPU 12 in the third embodiment, and when the extender is switched as described above, the extender switching information S5 is output from the CPU 12 to the image pickup apparatus side.

  Upon receiving the extender switching information S5, the imaging device side may stop (freeze) the image of the imaging device or prohibit the extender switching operation from the imaging device side during the switching of the extender based on the extender switching information S5. Used for.

  In this way, in this embodiment, information during the change of the extender (during switching) can be output to the imaging apparatus side, and the imaging apparatus side uses this information to change the image of the imaging apparatus during the switching of the extender. Can be stopped, and another video can be displayed on the screen that is stopped during the change.

  Furthermore, based on this information, the extender switching operation from the imaging device side can be prohibited to prevent image disturbance due to erroneous operation, and the user can concentrate on shooting and can perform comfortable extender operations. A system can be realized.

  As described above, in the above embodiment, the extender lens of the extender turret 3 (34) can be arranged arbitrarily, and the control circuit (CPU) 12 may be added for the extender control. However, an already built-in circuit is used. It is also possible to perform the control using a portion that is not. Moreover, it can implement also in the combination for every Example, etc., and is not restrict | limited to the said content.

It is a schematic block diagram which shows the imaging | photography system provided with the extender in this invention. It is a block diagram of the extender drive circuit in Example 1 of the present invention. It is a graph of the extender turret position and switching time in Example 1 of this invention. It is an extender turret arrangement | positioning figure in Example 1 of this invention. It is an operation | movement flowchart of the extender control in Example 1 of this invention. It is a block diagram of the extender drive circuit in Example 2 of the present invention. It is a graph of the extender turret position and switching time in Example 2 of this invention. It is a tower extender turret arrangement | positioning figure in Example 2 of this invention. It is a block diagram of the extender drive circuit in Example 3 of the present invention. It is a graph of the switching time of the extender turret in Example 3 of the present invention. It is the graph showing the movement of the aperture member in Example 3 of this invention. It is a block diagram of the extender drive circuit in Example 4 of the present invention. It is a conventional extender turret arrangement. It is a graph of the conventional extender turret position and switching time.

Explanation of symbols

1 Motor (drive means)
3 Extender turret (holding member)
4 Position detection circuit (detection means)

Claims (5)

Optical system,
A holding member that includes a plurality of extender lenses and rotates about an axis parallel to the optical axis of the optical system ;
Drive means for selectively adding one of the plurality of extender lenses to the optical system by driving the holding member in the rotation direction ;
Detecting means for detecting a position of the holding member in the rotation direction ;
In order to switch one extender lens selected from an extender command signal among the plurality of extender lenses from another extender lens and add it to the optical system, the drive unit is controlled to move the holding member to a target position. Control means for driving in the rotational direction until
The control means is configured so that the drive time until the holding means reaches the target position from the detection position is equal even when the drive amount from the detection position by the detection means to the target position is different. An optical device characterized in that the drive speed of the drive means is changed in accordance with the drive amount. The control means controls the drive means so that the drive speed by the drive means is doubled when the drive amount from the detection position to the target position is double. An optical device according to 1. The optical system has a diaphragm means;
The optical device according to claim 1, wherein the control unit controls the diaphragm unit to be in a closed state when the driving unit is driven. The optical device can be attached to an imaging device;
3. The optical apparatus according to claim 1, wherein when the driving unit is driven, the control unit outputs a signal indicating that the extender lens is being changed to the imaging device. 4. . An optical device according to any one of claims 1 to 4,
An imaging system comprising: an imaging device to which the optical device is mounted.

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