JP6688146B2 - Focus adjusting device and focus adjusting method - Google Patents

Description

  The present invention relates to a focus adjusting device and a focus adjusting method that have a focus adjusting lens and can focus manually.

  There are commercially available focus adjusting devices that perform focusing by moving a focus adjusting lens provided in the lens barrel according to the rotation amount of the range ring by a user manually operating a ring member such as a range ring. . The rotation amount and the rotation direction of the ring member are detected by sensors such as two photo interrupters (see, for example, Patent Document 1).

JP, 2005-152893, A

  In a shooting sequence such as long-time exposure, when the ring member is operated, the focus adjustment lens is immediately moved, and the sensor such as the photo interrupter is always supplied with power in order to perform focusing. You can do it like this. However, this method consumes a large amount of power battery. In order to prevent this, the above-mentioned Patent Document 1 proposes to provide another detection member for detecting the rotational operation of the ring member in the low power consumption mode. If the separate detection member is provided to detect the rotation operation of the ring member, the power supply battery can be prevented from being consumed, but the additional detection member increases the cost and increases the size.

  The present invention has been made in view of the above circumstances, and when detecting the rotation state of a ring member, it is possible to reduce the power consumption without providing a separate detection member and the focus adjustment device and the focus adjustment. The purpose is to provide a method.

In order to achieve the above object, a focus adjusting device according to a first aspect of the present invention includes a focus adjusting lens provided in a lens barrel including a taking lens and movable in an optical axis direction, and rotatable with respect to the lens barrel. A ring member disposed on the ring member, a signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member, and the ring based on the plurality of signals that have different phases output from the signal generation unit. A control unit that detects the rotation amount and the rotation direction of the member and controls the movement of the focus adjustment lens according to the detected rotation amount and the rotation direction, and the control unit has an operation detection state and an operation standby state. And, validating a part of the plurality of signals of the signal generating unit in the operation standby state, counting the number of changes of the valid partial signal output by the signal generating unit, Count exceeds a certain threshold Proceeds to the operation detection state if, on the basis of a signal output from the signal generating unit controls the movement of the focusing lens, and the control unit, the output of the signal generating unit in the operation standby state first In the operation detection state, the output of the signal generating unit is referred to in a second predetermined interval, and the first predetermined interval is smaller than the second predetermined interval .

In the focus adjusting device according to a second aspect of the invention, in the first aspect of the invention, the control unit controls the signal generation unit to operate in the operation standby state with lower power consumption than in the operation detection state. It

A focus adjusting device according to a third aspect of the present invention includes a focus adjusting lens that is provided in a lens barrel including a taking lens and is movable in the optical axis direction, and a ring that is rotatably arranged with respect to the lens barrel. The rotation amount and rotation of the ring member based on the member, a signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member, and a plurality of signals that have different phases output from the signal generation unit. And a control unit that controls the movement of the focus adjustment lens according to the detected rotation amount and rotation direction, and the control unit has an operation detection state and an operation standby state, and In the operation standby state, a part of the plurality of signals of the signal generating unit is validated, the number of changes of the valid partial signal output by the signal generating unit is counted, and the count number is a predetermined threshold value. If the operation exceeds Migrated to control the movement of the focusing lens based on a signal output from the signal generating unit, wherein the control unit, since the transition to the operation detection state to detect the signal output from the signal generating unit When controlling the movement of the focus adjustment lens based on the number, the corrected count number obtained by multiplying the count number detected in the operation standby state by a predetermined coefficient is set to the number detected by the signal output from the signal generation unit. Add and control.

In a focus adjusting device according to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the control unit has an interrupt processing circuit, and the control unit has the interrupt processing in the operation standby state. The output of the signal generation unit is input to the circuit, and counting of the number of signals output by the signal generation unit is started based on the output of the interrupt processing circuit.
In the focus adjusting device according to a fifth aspect of the present invention, in the second aspect of the present invention, the signal generation unit includes a plurality of pairs of optical sensors and a light emitting unit, and the control unit turns off the power of the light emitting unit. Reduces the power consumption of the signal generator.

A focus adjusting method according to a sixth aspect of the present invention is a focus adjusting lens provided in a lens barrel including a taking lens and movable in an optical axis direction, and a ring rotatably arranged with respect to the lens barrel. In a focus adjusting method of a focus adjusting device, comprising: a member; and a signal generating unit that generates a plurality of signals having different phases according to rotation of the ring member, in the operation standby state of the ring member of the signal generating unit. The step of validating a part of the plurality of signals and the number of changes of the valid part of the signals output by the signal generating section are counted, and when the count number exceeds a predetermined threshold value, the ring member. And the operation detection state, the rotation amount and the rotation direction of the ring member are detected and detected based on a plurality of signals with different phases output from the signal generation unit. And controlling the movement of the focusing lens in accordance with the the amount of rotation direction of rotation, in the operation standby state refers to the output of the signal generator at a first predetermined distance, the signal generated in the above operation detecting state The output of the unit is referred to at a second predetermined interval, and the first predetermined interval is set smaller than the second predetermined interval .
A focus adjusting method according to a seventh aspect of the present invention is a focus adjusting lens provided in a lens barrel including a taking lens and movable in an optical axis direction, and a ring rotatably arranged with respect to the lens barrel. In a focus adjusting method of a focus adjusting device, comprising: a member; and a signal generating unit that generates a plurality of signals having different phases according to rotation of the ring member, in the operation standby state of the ring member of the signal generating unit. The step of validating a part of the plurality of signals and the number of changes of the valid part of the signals output by the signal generating section are counted, and when the count number exceeds a predetermined threshold value, the ring member. And the operation detection state, the rotation amount and the rotation direction of the ring member are detected and detected based on a plurality of signals with different phases output from the signal generation unit. The step of controlling the movement of the focus adjustment lens according to the rotation amount and the rotation direction, and the focus adjustment lens based on the number of detected signals output from the signal generation unit after the operation detection state is entered. When controlling the movement of, the step of adding and controlling the correction count number obtained by multiplying the count number detected in the operation standby state by a predetermined coefficient to the detected number of the signal output by the signal generation unit, Have.

  According to the present invention, it is possible to provide a focus adjustment device and a focus adjustment method that can reduce power consumption without providing a separate detection member when detecting the rotation state of a ring member.

It is a block diagram which shows the structure of the camera which concerns on one Embodiment of this invention. FIG. 1 is a block diagram mainly showing an electrical configuration of a camera of one embodiment of the present invention. FIG. 6 is a state transition diagram of manual focus (MF) in the camera of one embodiment of the present invention. 6 is a timing chart showing operations in a quadruple count mode and an up / down count mode in the camera of one embodiment of the present invention. FIG. 6 is a diagram showing a monitoring cycle when the photo interrupter is turned off and when it is turned on in the camera of one embodiment of the present invention. 6 is a flowchart showing a manual focus (MF) drive operation in the camera of one embodiment of the present invention. 6 is a flowchart showing a manual focus (MF) drive operation in the camera of one embodiment of the present invention. 7 is a flowchart showing an operation of MFPI2 lighting determination in the camera of one embodiment of the present invention. 8 is a timing chart illustrating a modified example of lens driving when a user operation wait state is changed to a user operation state in the camera of one embodiment of the present invention.

  Hereinafter, an example applied to a digital camera as one embodiment of the present invention will be described. This camera has an imaging unit, converts the subject image into image data by the imaging unit, and performs live view display of the subject image on a display unit arranged on the back surface of the main body based on the converted image data. The user determines the composition and shutter timing by observing the live view display. During the release operation, the image data is recorded on the recording medium. The image data recorded on the recording medium can be reproduced and displayed on the display unit when the reproduction mode is selected.

  Further, the camera according to the present embodiment is provided with a distance ring on the outer periphery of the lens barrel, and when the user rotationally operates the distance ring, the two photo interrupters (see MFPI63a and MFPI63b in FIG. 2, which will be described later) cause the rotation direction and Detect the amount of rotation. If the range ring is not rotated for a predetermined time (eg, S57 Yes in FIG. 8), the second photo interrupter of the two is turned off (eg, S59 in FIG. 8), and the other first photo interrupter is turned off. The operation state of the distance ring is detected by the photo interrupter (for example, S53, S55, S61 in FIG. 8). When the rotation is detected by the second photo interrupter, the second photo interrupter is turned on (for example, S67 in FIG. 8), and the rotation direction and the rotation amount are detected by the two photo interrupters (for example, refer to S71 in FIG. 8). ).

  FIG. 1 is a block diagram showing a configuration of a camera according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an electrical configuration of this camera. This camera includes an interchangeable lens 100 and a camera body 200. However, it goes without saying that the lens barrel and the camera body may be integrally formed.

  The interchangeable lens 100 has a photographing lens 11 including lenses 11a to 11c. A subject image is formed by the taking lens 11. Of these, the focus lens 11b is a focus adjustment lens and is movable in the optical axis direction by the focus lens drive mechanism 25. The focus lens drive mechanism 25 has a focus lens actuator and a focus lens drive circuit. Part of the lenses 11a to 11c is a zoom lens for changing the focal length. Therefore, a zoom lens group is provided in the interchangeable lens 100. The focus lens 11b corresponds to a focus adjustment lens that is movable in the optical axis direction and is provided in a lens barrel including a taking lens.

  Further, when the focus lens 11b reaches the reference position, the focus lens reference position detection unit 27 outputs a detection signal to the CPU 41 which is the control unit. A photo interrupter (PI) is used for reference position detection. In the present embodiment, when the reference position is detected, the position of the focus lens 11b is detected based on the applied pulse number (Pls number) to the actuator for the focus lens (using the stepping motor) when the reference position is detected. Do it.

  A diaphragm 13 is arranged between the lenses 11a and 11b. The aperture diameter of the diaphragm 13 is changed by the diaphragm driving mechanism 21, and the amount of light of the subject passing through the taking lens 11 is changed. The diaphragm drive mechanism 21 has a diaphragm actuator, a diaphragm driver circuit, and the like. A stepping motor is used as the actuator, and fine control is performed by microstep driving. It should be noted that the diaphragm 13 may of course be arranged other than between the lenses 11a and 11b.

  The aperture reference position detection unit 23 outputs a detection signal to the CPU 41 when the aperture diameter of the aperture reaches the reference position. Regarding the diaphragm position, the reference position detecting unit 23 acquires the reference position, and the diaphragm position is managed by relative position detection. The relative position is detected by the number of pulses applied to the stepping motor, and the reference position is detected by the photo interrupter (PI).

  A distance ring 51 is arranged on the outer circumference of the interchangeable lens 100. The distance ring 51 is rotatable around the outer circumference of the interchangeable lens 100 and is also slidable within a predetermined range in the optical axis direction of the taking lens 11. The distance ring 51 is set to the MF (manual focus) position when it is slid to the subject side, and is set to the RF (range focus) position when it is slid to the main body side. By sliding the range ring 51, the RF mode and the MF mode (non-RF mode) are switched. The RF mode detection unit 33 detects this mode. Further, the distance ring 51 is configured to be rotatable between the closest distance and the infinite distance. The distance ring 51 functions as a ring member rotatably arranged with respect to the lens barrel.

  The MF mode is a mode in which the user focuses on the rotation direction and the rotation amount of the distance ring 51, while the RF mode is a mode in which the distance ring 51 focuses on a distance designated by the distance ring 51. That is, both the MF mode and the RF mode are manual focus, but in the MF mode, the distance ring 51 specifies a relative distance, whereas in the RF mode, it is different in that an absolute distance is specified.

  When the RF mode is set by sliding the range ring 51 and the range ring 51 is rotated, the RF position detection unit 31 detects the rotational position. The RF position detector 31 detects the absolute position of the rotation position of the range ring 51. The focus lens drive mechanism 25 drives the focus lens 11b to a shooting distance according to the rotation position of the distance ring 51 according to a control signal from the CPU 41.

  The RF mode detector 33 detects whether the range ring 51 is set to the MF position or the RF position based on the output of the RF / MF mode detection switch 83 (see FIG. 2).

  The MF position detector 35 detects the rotation direction and the rotation amount of the distance ring 51 when the distance ring 51 is set at the MF position. The MF position detector 35 has a first MFPI 63a, a second MFPI 63b, a first MFPI binarization circuit 61a, a second MFPI binary circuit 63b, etc., which will be described later. When the range ring 51 rotates, the light shielding blades inside the range ring 51 rotate together. The rotation of the light shielding blade is counted by the photo interrupter (PI), and the focus lens 11b is driven based on the count result by the MF position detection unit 35. The rotation direction and the rotation amount of the distance ring 51 may be detected by a sensor other than the photo interrupter. The MF position detection unit 35 functions as a signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member. The signal generator is composed of a plurality of pairs of photosensors and light emitters.

  A zoom ring 52 is rotatably arranged on the outer circumference of the interchangeable lens 100 and closer to the main body than the distance ring 51. The taking lens is a zoom lens having a variable focal length, and a user can perform zooming by manually rotating the zoom ring 52.

  The zoom position detector 34 detects the absolute value of the rotational position of the zoom ring 52 and outputs it to the CPU 41. The zoom position detection unit 34 has a linear encoder ZM position detection unit 82 as described later, and the output of the linear encoder position detection unit 82 is AD-converted by the A / D converter 44 in the CPU 41. The AD conversion value represents the focal length.

  The storage unit 37 has an electrically rewritable non-volatile memory such as a flash memory, and stores a program for the CPU 41, various information such as optical data of the interchangeable lens, various adjustment values, various parameters, and the like.

  The CPU 41, which is a control unit, controls the inside of the interchangeable lens 100 according to a control command from the camera body 200 in accordance with the program stored in the storage unit 37 described above. The CPU 41 inputs detection signals from the aperture reference position detection unit 23, the focus lens reference position detection unit 27, the RF position detection unit 31, the RF mode detection unit 33, the zoom position detection unit 34, and the MF position detection unit 35, It also outputs a control signal to the focus lens driving mechanism 25 and the diaphragm driving mechanism 21.

  Further, the CPU 41 detects the rotation amount and the rotation direction of the ring member based on the plurality of signals having different phases output from the signal generation unit, and controls the movement of the focus adjustment lens according to the detected rotation amount and the rotation direction. Function as a control unit. The control unit has an operation detection state and an operation standby state (see, for example, FIG. 3), and validates some of the plurality of signals of the signal generation unit in the operation standby state (for example, FIG. 8). (See S59 and S61), count the number of changes of the effective part of the signals output by the signal generation unit (see, for example, S53 and S55 in FIG. 8), and detect the operation detection state when the counted number exceeds a predetermined threshold value. (For example, S65 Yes in FIG. 8), the movement of the focus adjustment lens is controlled based on the signal output from the signal generator (see, for example, FIG. 7). The control of the movement of the focus adjustment lens will be described later with reference to the flowcharts shown in FIGS.

  Further, in the operation standby state, the control unit controls the signal generation unit to operate with lower power consumption than in the operation detection state (for example, see S59 in FIG. 8). The control unit refers to the output of the signal generation unit at a first predetermined interval in the operation standby state, and refers to the output of the signal generation unit at a second predetermined interval in the operation detection state, and the first predetermined interval is the above. It is smaller than the second predetermined interval (see, for example, FIG. 5). The control unit reduces the power consumption of the signal generation unit by turning off the power of the light emitting unit (for example, see S59 in FIG. 8).

  An image sensor 201, a CPU 203 in the control unit, a storage unit 205, and an operation input unit 207 are arranged in the camera body 200. The image pickup element 201 is arranged near the image forming position of the taking lens 11, photoelectrically converts the subject image formed on the taking lens 11, and outputs image data. Further, the CPU 203 communicates with the CPU 41 in the interchangeable lens 100. The storage unit 205 has a program for controlling the entire camera system, and the CPU 203 controls the entire camera system. The operation input unit 207 has various operation members such as a release button and a cross button.

  Next, details of the electrical configuration will be described with reference to FIG. The CPU 41 can communicate with the camera body 200 as described above. Further, the CPU 41 is connected to a motor driver 71, and the motor driver 71 drives the LDPI 69, LDMT 73, AVMT 75, and AVPI 77.

  The LDPI 69 is a photo interrupter for detecting the reference position of the focus lens 11b, and the output of this LDPI 69 is connected to the LDPI binarization circuit 67. The LDPI 69 and the LDPI binarization circuit 67 correspond to the focus lens reference position detection unit 27 described above.

  The LDMT 73 is an LD motor (lens drive motor), and functions as a focus actuator in the focus lens drive mechanism 25 described above. In this embodiment, a stepping motor is used as the LD motor, but other motors such as a general VCM (voice coil motor) may be used. The AVMT 75 is an aperture motor, and functions as an aperture actuator in the aperture drive mechanism 21 described above.

  The AVPI 77 is a photo interrupter for detecting the reference position of the diaphragm 13. The output of the AVPI 77 is connected to the AVPI binarization circuit 79. The AVPI 77 and the AVPI binarization circuit 79 correspond to the aperture reference position detection unit 23 described above.

  The MFPI driver 65 is a driver for the first MFPI 63a and the second MFPI 63b for detecting rotation of the range ring 51 when the range ring 51 is slid to the MF position. Each of the first and second MFPIs 63a and 63b has an optical sensor and a light emitting unit, and a light shielding blade is configured to pass between the optical sensor and the light emitting unit. The MFPI driver 65 turns on and off the light emitting portions of the first and second MFPIs 63a and 63b according to an instruction from the CPU 41.

  The first MFPI (abbreviated as “MPI1” in the figure) 63a and the second MFPI 63b (abbreviated as “MFPI2” in the figure) 63b are located at positions slightly apart from each other in the rotation direction of the light shielding blade. , Respectively. The installation locations of the first MFPI 63a and the second MFPI 63b are so arranged that the phase difference between the signals from the two MFPI 63a and the MFPI 63b is shifted by 90 degrees. When the distance ring 51 is rotated by the user, the light-shielding blades move in conjunction with each other, and the light-shielding blades cause the MFPI 63 to be in a light-shielding state and a light-transmitting state, so that 90 degrees from the two first and second MFPIs 63a and 63b. A pulse signal with a phase shift is output.

  The output of the first MFPI 63a is connected to the first MFPI binarization circuit 61a and is binarized by the first MFPI binarization circuit 61a. Similarly, the output of the second MFPI 63b is connected to the second MFPI binarization circuit 61b and is binarized by the second MFPI binarization circuit 61b. The first and second MFPI binarization circuits 61a and 61b, the first and second MFPIs 63a and 63b, and the MFPI driver 65 correspond to the MF position detection unit 35 described above.

  The binarized pulse signal from the MFPI 63 is output to the CPU 41, and the two-phase counter in the CPU 41 counts the pulses corresponding to the rotation speed of the distance ring 51, and also detects the rotation direction. In the present specification, the number of pulses counted within the time of the monitoring cycle (for example, 10 ms or 30 ms) is referred to as the “edge input number”. As will be described later, this edge input number is used when calculating the drive pulse number (Pls number) of the stepping motor when the focus lens 11b is driven by the LDMT 73.

  The linear encoder RF position detector 81 is a linear encoder for detecting an absolute value in the rotation direction of the range ring 51 when the range ring 51 is slid to the RF position. The linear encoder RF position detector 81 is provided so that the detection contact moves according to the rotation of the distance ring 51, and outputs an analog signal according to the absolute position of the distance ring 51 in the rotation direction. An A / D converter 43 is provided in the CPU 41, and converts an analog signal from the linear encoder RF position detector 81 into a digital signal. The A / D converted value by the A / D converter 43 represents the subject distance (absolute distance) set by the user.

  The linear encoder ZM position detector 82 is an encoder for detecting an absolute value in the rotation direction of the zoom ring 52. The linear encoder ZM position detector 82 is provided along the rotation direction of the zoom ring 52 and outputs an analog signal according to the absolute position of the zoom ring 52 in the rotation direction. An A / D converter 44 is provided in the CPU 41, and converts an analog signal from the linear encoder ZM position detection unit 82 into a digital signal. The A / D converted value by the A / D converter 44 represents the focal length (absolute distance) set by the user.

  The RF / MF mode detection switch (SW) 83 is a switch for detecting whether the range ring 51 is set to the RF mode or the MF mode. The RF / MF mode detection SW 83 detects the position of the distance ring 51 in the optical axis direction and is turned on or off when the RF mode is set or when the MF mode is set, and this on / off state is output to the CPU 41.

  Next, the state transition in the case of performing the manual focus operation will be described with reference to FIG. The interchangeable lens 100 and the camera body 200 are connected by communication, and upon receipt of a command from the camera body 200, the MF mode is entered. The interchangeable lens 100 may be provided with an MF / AF mode switching SW, and the mode may be switched by this SW.

  In the present embodiment, the user operation state and the user operation waiting state are switched by an algorithm shown in FIGS. 6 to 8 described later. There are two manual focus (MF) states in the interchangeable lens 100: a user operation state UO and a user operation waiting state UW.

  In the user operation waiting state UW, the second MFPI 63b is in the off state, and is waiting for the user operation due to the input edge count of the first MFPI 63a. That is, one of the two photo interrupters provided to detect the rotation operation of the range ring 51 is turned off, and the pulse output from the remaining one photo interrupter (MFI 63a) is counted. It is a state in which it is determined whether or not the range ring 51 has been rotationally operated based on.

  When the user operation state UO is reached, both the first and second MFPIs 63a and 63b are turned on, and the user operation is counted by the first and second MFPIs 63a and 63b. That is, both of the two photo interrupters provided for detecting the rotation operation of the range ring 51 are turned on, and the rotation amount and the rotation direction of the range ring 51 are detected based on the pulse output from each photo interrupter. Is ready to go.

  When a predetermined condition is satisfied in the user operation state UO, the state transits to the user operation waiting state UW. This transition is performed by the following procedure.

(1) If the MF edge non-detection time (Tim_U_detec_edg), which indicates the time when the pulse from the photo interrupter is not detected, is equal to or longer than the MF edge non-detection determination (U_detec_edg_judg) time preset as the determination value, the user operation is performed. It is determined that it has not been broken (see S57 in FIG. 8). When it is determined that the user operation is not performed, the second MFPI 63b (MFP I2) is turned off (see S59 in FIG. 8), and the power consumption is reduced.

(2) When it is determined that the user operation is not performed, the count mode of the photo interrupter (MFP I61a) of the CPU 41 is set to the up / down count mode, and the monitoring of the user operation is started (see S61 in FIG. 8). . The up / down count mode will be described later with reference to FIG.

(3) When transitioning to the user operation waiting state UW, the MF edge non-detection time (Tim_U_detec_edg) is cleared once.

  When in the user operation waiting state UW, it is determined whether or not the user has rotated the distance ring 51 with the second photo interrupter 63b turned off and the first photo interrupter 63a turned on. That is, the detected edge (Cnt_MF_edg) of the first MFPI 63a (MFP I1) is counted and it is determined whether or not a user operation is performed (see S53 Yes and S65 in FIG. 8). The monitoring of the count state is performed for each edge detection waiting time (Tim_detec_pi1) of the first MFPI 63a (MFP I1) (when the light is off in FIG. 5, see S9 and S11 in FIG. 6).

  Specifically, the transition from the user operation waiting state UW to the user operation state UO is performed by the following procedure.

(1) When the number of MF edges (Cnt_MF_edg) detected by the first MFPI 63a becomes equal to or larger than the MF edge count determination (MF_edg_judg), it is determined that the user operation is performed, and the second MFPI 63b (MFPI2) is turned on ( (See S53 Yes, S65 Yes, and S67 in FIG. 8).

(2) The count mode of the photo interrupters (MFP I1, 2) of the CPU 41 is set to the quadruple phase difference count mode, and the edge count of the photo interrupters (MPI I1, 2) input at the update time interval is started (lighting in FIG. 5). See time). The quadruple phase difference count mode will be described later with reference to FIG.

(3) After shifting to the user operation state UO, the number of MF edges (Cnt_MF_edg) is once cleared (see S73 in FIG. 8).

  When the user operation state UO is reached, manual focus (MF) control is performed (see FIG. 7). In this manual focus control, the drive control of the focus lens 11b is performed based on the rotation amount and the rotation direction of the distance ring 51 based on the two-phase pulses of the two photo interrupters (MFP I63a, 63b). In this drive control, the focus drive amount corresponding to the number of edges is driven in each MFPI update cycle (for example, 10 ms or 30 ms) (see lighting in FIG. 5).

  Between the interchangeable lens 100 and the camera body 200, there are input and output of two instructions, a manual focus start instruction ST and a manual focus end instruction SP. When the command of the manual focus start instruction ST is received from the camera body 200 (see S1 in FIG. 6), the interchangeable lens 100 temporarily transits to the user operation state UO. On the other hand, when the command of the manual focus end instruction SP is received (see S39 in FIG. 7), the interchangeable lens 100 stops driving if the focus lens (LD) is being driven (S43, S45 in FIG. 7), and the first Then, both the second MFPI 63a and the second MFPI 63b are turned off (see S49 in FIG. 7).

  As described above, in the user operation waiting state UW, the first photo interrupter 63a (MFI1) is turned on and the second photo interrupter 63b (MFI2) is turned off. The first photo interrupter 63a is for detecting the user's MF operation, and the second photo interrupter 63b is turned off to reduce power consumption. Then, when a user operation is detected (S11 in FIG. 6, S65 Yes in FIG. 8), both the first and second MFPIs 63a and 63b (MFPI1 and 2) are turned on to perform MF control. On the other hand, when a certain period of time has passed without any user operation (S57 Yes in FIG. 8), the second photo interrupter 63b (MFP I2) is turned off to reduce power consumption.

  Next, detection of the rotation amount when the rotation operation of the distance ring 51 is performed will be described with reference to FIG. In this embodiment, there are two modes, that is, a quadruple phase difference count mode and an up / down count mode. The quadruple phase difference count mode is a mode in which both of the two photo interrupters (MFI 63a and 63b) are turned on and the number of input edges of pulses is counted. This quadruple phase difference counting mode is executed in step S71 of FIG. 8 described later.

  In the up / down count mode, one of the two photo interrupters (MFI 63a and 63b) (the first photo interrupter (MFI 63a) is turned on and the other photo interrupter (MFI 63b) is turned off, and the photo interrupter is turned on. This is a mode for counting the number of input edges of the pulse output from the interrupter (MFP I63a) This up / down count mode is executed in step S61 of FIG.

  FIG. 4A shows changes in pulse signals of the first photo interrupter 63a (MFI1) and the second photo interrupter 63b (MFI2) in the quadruple phase difference count mode. The uppermost MFPI1 shows the temporal change of the pulse signal of the first photo interrupter 63a, and the second upper MFPI2 shows the temporal change of the pulse signal of the second photointerrupter 63b. The counter QPCR at the bottom is a counter that counts the number of input edges of the photo interrupter.

  The counter QPCR detects the operation direction and counts according to how the combination of the pulse signal levels of the MFPI1 and MFPI2 changes from the previous state. In the counter QPCR, the levels of the pulse signals of the MFPI1 and MFPI2 are, for example, (L, L) → (H, L) → (H, H) → (L, H) corresponding to the normal direction of the distance ring 51. ) → (L, L) ... Change is detected and the count value is added for each change. Further, in the counter QPCR, the levels of the pulse signals of the MFPI1 and MFPI2 are, for example, (L, L) → (L, H) → (H, H) → (H, corresponding to the reverse direction of the distance ring 51. A change of (L) → (L, L) ... Is detected and the count value is subtracted for each change.

  At time t1 in FIG. 4A, since the MFPI1 is in the L state and the MFPI2 changes from the H level to the L level, the counter counter QPCR detects the change of (L, H) → (L, L). At this time, 1 is added to the count value of the counter QPCR, and the counter value changes from 1 to 2. At time t2, since the MFPI2 is in the L state and the MFPI1 changes from the L level to the H level, the counter QPCR detects the change of (L, L) → (H, L). At this time, 1 is added to the count value of the counter QPCR, and the counter value becomes 2 to 3. After that, until time t10, the count of the counter QPCR is counted according to the combination of the pulse signal levels due to the change of the input edge (change from L level to H level or change from H level to L level) of the MFPI1 and MFPI2. One is added to the value, and it is detected that the distance ring 51 is operated in the normal direction.

  At time t11, the rotation direction of the distance ring 51 is reversed and operated in the reverse direction, and the MFPI1 changes from the H level to the L level while the MFPI2 is in the L state. Therefore, the counter QPCR is (H, L) → (L , L) is detected. At this time, 1 is subtracted from the counter QPCR, and the counter value is decreased from 11 to 10. After that, when the operation is performed in the reversing direction, one is subtracted each time an input edge is generated from the MFPI1 or the MFPI2, and it is detected that the distance ring 51 is operated in the reversing direction (reverse rotation). There is. The LDMT 73 that drives the focus lens 11b is driven by a focus drive amount according to the count value of the number of edges counted by the counter QPCR every MFPI update cycle (for example, 10 ms or 30 ms).

  FIG. 4B shows changes in pulse signals of the first photo interrupter 63a (MFI1) and the second photo interrupter 63b (MFI2) in the up / down count mode. Similar to the case of FIG. 4A, the uppermost MFPI1 shows the temporal change of the pulse signal of the first photo interrupter 63a, and the second MFPI2 of the pulse signal of the second photointerrupter 63b. It shows the change over time. The counter QPCR at the bottom is a counter that counts the number of input edges of the photo interrupter. In FIG. 4B, since the second photo interrupter 63b (MFP I2) is in the off state, the output remains at the L level.

  At time t21 in FIG. 4B, the MFPI2 is in the L state, and the MFPI2 changes from the L level to the H level. At this time, 1 is added to the counter QPCR and the count value becomes 2. At time t22, the MFPI2 is in the L state, and the MFPI1 changes from the H level to the L level. At this time, 1 is added to the counter QPCR and the count value becomes 3. Thereafter, every time the input level of MFPI1 changes from H to L or from L to H, 1 is added to the counter QPCR.

  Next, the detection timing when the second photo interrupter 63a is turned off and when it is turned on will be described with reference to FIG. The first photo interrupter 63b is in a lighting state when the camera body 200 is powered on. However, as described above, the second photo interrupter 63b is turned off in the user operation waiting state UW, and is turned on in the user operation state UO (see FIG. 3). When the light is turned off, the detection interval by the first photo interrupter 63a is made different when the light is turned off so that the manual focus can be started immediately when the user operates the distance ring 51.

  In FIG. 5, the horizontal axis represents time, the upper ordinate represents the detection interval of the first photo interrupter 63a when the second photo interrupter 63b is in the off state, and the lower ordinate represents the second photo interrupter. The detection interval of the first photo interrupter 63a when 63b is in the lighting state is shown.

  5 is in the user operation waiting state UW, and in this case, the MF edge non-detection determination time Tim_detec_pi1 is detected at a short interval of about 5 ms, for example. Time T1 is the timing when it is determined that the user has performed an operation. In this case, after waiting for the photo-interrupter lighting stabilization time, the timer for detecting the user operation is immediately started. This switching can be performed in about 1 ms, for example. Note that, after time T1, the MF edge non-detection determination is shown by a broken line in the upper stage, but it is not performed because it actually shifts to the lighting state.

  The lighting state shown in the lower part of FIG. 5 is the user operation state UO, and the rotation amount of the distance ring 51 by the user is detected after the time T1. In this case, the detection cycle of the first and second photo interrupters 63a and 63b is a long interval of about 10 ms or 30 ms, for example.

  As described above, in the present embodiment, when the user is not operating the distance ring 51, one of the two photo interrupters is turned off and the other photo interrupter that is turned on causes a relatively short cycle. The operating state of the range ring 51 is detected by. As a result of this detection, when it is determined that the distance ring 51 has been operated, both of the two photo interrupters are turned on, and the rotation amount and the rotation direction of the distance ring 51 are detected in a relatively long cycle.

  Next, the manual focus operation will be described with reference to the flowcharts shown in FIGS. This flowchart is executed by the CPU 41 controlling each unit in the interchangeable lens 100 in accordance with the program stored in the storage unit 37.

  When the MF drive flow shown in FIG. 6 is started, first, an MF drive command is received from the CPU 203 in the body unit 200 (S1). The MF mode is set by sliding the distance ring 51, and the RF mode detection unit 33 waits for the reception of the MF drive command from the CPU 203 in a state where the distance ring 51 is detected to be set at the MF position. Upon receiving the MF drive command, MF (manual focus) drive is started. The AF operation is possible even when the distance ring 51 is set to the MF position. The AF operation command is received from the CPU 203 to execute the AF operation, and the MF operation command is received to receive the MF operation. Is possible.

  When the MF drive command is received, the first and second MFPIs 63a and 63b are turned on (S3), and the PI (photo interrupter) waits for stabilization (S5). In the MF mode, drive control of the focus lens 11b is performed according to the pulse signals of the first and second MFPIs 63a and 63b generated according to the rotation operation of the distance ring 51. Therefore, in step S5, the first and second MFPIs 63a and 63b for detecting the rotation operation of the distance ring 51 are put into the operating state and wait for the output signal to stabilize.

  When the PI becomes stable, the 4 × phase difference counting mode is set (S7). Here, in detecting the rotation amount and the rotation direction of the distance ring 51 using the first and second MFPIs 63a and 63b and the first and second MFPI binarization circuits 61a and 61b, FIG. The mode is set to the quadruple phase difference counting mode described using.

  When the quadruple phase difference count mode is set, it is next determined whether or not the time of the MF edge non-detection determination time Tim_detec_pi1 has passed (S9). Here, it is determined whether or not the MF edge non-detection determination time at the time of turning off shown in the upper part of FIG. 5 has elapsed. If the result of determination is that it has not elapsed, it waits until it has elapsed.

  As a result of the determination in step S9, when Tim_detec_pi1 time has elapsed, next, MFPI2 lighting determination is performed (S11). Here, it is determined whether the second photo interrupter 63b is turned off or turned on according to the operation state of the distance ring 51. That is, it is determined whether or not the second photo interrupter 63b is turned on if it is turned on, and conversely, if the second photo interrupter 63b is turned off, it is turned on or not. . Further, either the 4 × phase difference count mode or the up / down count mode described with reference to FIG. 4 is set in accordance with the lighting / extinguishing state of the second photo interrupter 63b, and the photo interrupter (MPI I1, 2) is set. Determine how to count edge signals. The detailed operation of this MFPI2 lighting determination will be described later with reference to FIG.

  When it is determined in step S11 whether or not the MFPI1 and 2 are turned on, it is next determined whether or not the second photo interrupter 63b (MFPI2) is turned on (S13). As described above, the second photo interrupter 63b (MFP I2) is set to the ON state or the OFF state in the subroutine for determining whether to turn on the MFPI2 in step S11. In this step 13, determination is made based on the setting state in step S11. If the result of this determination is that the second photo interrupter 63 (MFP I2) is off, processing returns to step S9.

  If the result of determination in step S13 is that the MFPI2 is on, edge detection (detection of the number of input edges) is started (S21). When the second photo interrupter 63b (MFI2) is turned on, the first and second MFPI binarization circuits 61a and 61b binarize the pulse signals from the first and second photo interrupters 63a and 63b. By this binarization, the switching time from H level to L level or from L level to H level can be detected as an edge. The outputs of the first and second MFPI binarization circuits 61a and 61b are respectively connected to the counter of the CPU 41, and this counter counts the number of edges input in the quadruple phase difference count mode.

  When the edge detection is started, the timing operation of the edge detection timer is started (S23), and when the MFPI monitoring cycle (update cycle) has elapsed, the edge detection is ended (S25). Here, as described in the lower part of FIG. 5, the time counting operation is performed in a relatively long detection cycle.

  When the edge detection is completed, the number of edges is acquired (S27), and the distance ring rotation direction is determined (S29). As described above, the counter in the CPU 41 counts the number of edges of the pulse signals output from the first and second MFPI binarization circuits 61a and 61b in the quadruple phase difference count mode. The counter value at the time of detection is acquired as the number of edges. Further, two first and second MFPIs 63a and 63b are arranged such that the phase difference of the pulse signals is shifted by 90 degrees. The direction of rotation of the range ring 51 is determined by determining which of the two pulse signals precedes by the quadruple phase difference count mode.

  If the distance ring rotation direction is determined, then the focus drive amount calculation is performed (S31). Here, the focus drive amount (Pls number) is calculated based on the number of edges acquired in step S21.

  After the focus drive amount is calculated, it is next determined whether or not the LD is being driven (the focus lens is being driven) (S33). It is determined whether or not the LD drive, that is, the focus lens 11b is being driven. If the result of this determination is that the focus lens 11b is not driving, focus driving is started (S37). Here, the CPU 41 causes the lens drive motor LDMT73 to start driving via the motor driver 71 in accordance with the focus drive amount (Pls number) calculated in step S31.

  On the other hand, if the result of determination in step S33 is that the focus lens 11b is being driven, the target position is updated (S35). Since the number of edges is acquired and the focus drive amount is calculated every MFPI monitoring cycle, in this step, the target position is updated according to the newly calculated focus drive amount (Pls number).

  When the focus drive is started in step S37 or the target position is updated in step S35, it is next determined whether or not the StopMF command is received (S39). When the user releases the manual focus (MF) mode, the camera body 200 sends a StopMF command to the interchangeable lens 100. In this step, determination is made based on whether or not this StopMF command has been received.

  If the result of determination in step S39 is that the StopMF command has not been received, it is determined whether or not LD drive is in progress, as in step S33 (S41). If the result of this determination is that the focus lens 11b is being driven, processing returns to step S21, and the aforementioned operation is executed. On the other hand, if the focus lens 11b is not being driven, the process returns to step S9 and the above-described operation is executed. In this case, if it is determined in the MFPI2 lighting determination of step S11 that the user is not rotating the range ring 51, the second photo interrupter 63b (MFI2) is turned off (see S57 and S59 in FIG. 8).

  Returning to step S39, when the StopMF command is received as a result of the determination in this step, similarly to step S33, it is determined whether or not the LD is being driven (S43). If the result of this determination is that the focus lens 11b is being driven, stop processing is carried out (S45). Here, the CPU 41 stops driving the lens drive motor LDMT 73 via the motor driver 71.

  If the result of determination in step S43 is that the focus lens 11b is not being driven, or if stop processing has been performed in step S45, the first and second photo interrupters (MPI I1, 2) are turned off (S49). When this extinguishing process is performed, the MF drive flow ends.

  Next, the MFPI2 lighting determination in step S11 will be described with reference to the flowchart shown in FIG. Immediately after starting the MF drive, both the first and second photo interrupters 63a and 63b are in the lighting state.

  When the flow of the MFPI2 lighting determination of FIG. 8 is entered, first, the edge detection state of the MFPI2 determination MFPI1 is updated (S51). Here, the edge detection result (count value) obtained by counting the signal obtained by binarizing the output signal of the first photo interrupter 63a (MFI1) by the first MFPI binarization circuit 61a by the counter QPCR is input.

  Then, it is determined whether or not there is the MFPI1 input edge (S53). Here, the determination is made based on the edge detection state of the MFPI 1 updated in step 51.

  If the result of determination in step S53 is that there is no MFPI1 input edge, the MF edge undetected time Tim_U_detec_edg is counted up (S55). The MF edge undetected time Tim_U_detec_edg is counter data for measuring the time during which the range ring 51 is not rotated. The MF edge non-detection time is set to 10 ms or 30 ms, for example, as in the above-mentioned monitoring cycle.

  Then, it is determined whether or not MF edge non-detection time ≧ MF edge non-detection determination time (S57). Here, it is determined whether or not the MF edge non-detection time (Tim_U_detec_edg) measured in step S55 is longer than the MF edge non-detection determination time (U_detec_edg_judg) preset as a threshold value. When the result of this determination is No, that is, when the MF edge non-detection time is shorter than the MF edge non-detection determination time, the MFPI2 lighting determination flow is ended and the original flow is returned to. Here, the MF edge non-detection determination time is a value obtained by multiplying the MF edge non-detection time by a predetermined coefficient, and is set to a value such as 1 sec (sec) to 20 sec (sec).

  On the other hand, if the determination result in step S57 is Yes, that is, if the MF edge undetected time exceeds the MF edge undetected determination time, the MFPI2 is turned off (S59). Here, since there is no edge signal from the first photo interrupter 63a (MFI1) and the distance ring 51 is not rotationally operated for a predetermined time, the second photo interrupter 63b (MFI2) is turned off. As a result, it is possible to prevent power consumption.

  When the MFPI2 is turned off, the up / down count mode is set (S61). Here, the up / down count mode described with reference to FIG. 4B is set. With this setting, the counting operation is performed based on the edge signal from the first photo interrupter 63a.

  When the up / down count mode is set, the MF edge undetected time Tim_detec_edg is cleared (S63).

  Returning to step S53, if the result of determination in this step is that there is an MFPI1 input edge, it is determined whether or not it is in quadruple phase difference mode (S64). Ends the MFPI2 lighting determination. On the other hand, if the result of determination in step S64 is not the quadruple phase difference count mode, that is, if it is up / down count mode, it is determined whether or not MF edge number (Cnt_MF_edg) ≧ MF edge count determination (MF_edg_Judg) (S65). . Here, it is determined whether or not the number of MF edges (Cnt_MF_edg) counted in the up / down count mode set in step S61 is larger than a preset MF edge count determination (MF_edg_Judg).

  If the result of determination in step S65 is that MF edge number ≧ MF edge count determination, the second photo interrupter 63b (MFP I2) is turned on (S67), and PI (photo interrupter) waits for stabilization (S69). . Since the range ring 51 is rotated, the second photo interrupter (MPI2) is turned on by the first and second photo interrupters (MFI1 and 2) 63a and 63b to detect the rotation amount and the rotation direction. And wait for the output signal to stabilize.

  When the output signal of PI becomes stable, the mode is set to the quadruple phase difference count mode (S71). Here, the 4-times phase difference counting mode described with reference to FIG. 4A is set. With this setting, the counting operation is performed based on the edge signals from the first photo interrupter 63a and the second photo interrupter 63b.

  When the mode is set to the quadruple phase difference count mode, the number of MF edges (Cnt_MF_edg) is cleared (S73). Here, the number of MF edges (Cnt_MF_edg) determined in step S65 is cleared to zero.

  If the number of MF edges (Cnt_MF_edg) is cleared in step S73, or the MF edge non-detection time (Tim_detect_edg) is cleared in step S63, or if the result of the determination in step S57 is No, or the determination in step S65 If the result is No, or in the case of the 4 × phase difference count mode in step S64, the original flow is returned (return to S13 in FIG. 6).

  As described above, in the embodiment of the present invention, when the MF drive is started, the first and second photo interrupters 63a and 63b are turned on (S3 in FIG. 6), and the edge corresponding to the rotation operation of the distance ring 51 is performed. The number is detected, and focus drive is performed according to the detected number of edges (S7 in FIG. 6, S21 to S37 in FIG. 7). When the user does not operate the distance ring 51, the input edge is not output from the first photo interrupter 63a, and when a predetermined time elapses in this state (S57 Yes in FIG. 8), the second photo interrupter 63b is turned off (see FIG. 8 S59). The mode is switched to the up / down count mode (S61 in FIG. 8).

  When the user rotates the distance ring 51 while the second photo interrupter 63b is off, the input edge is output from the first photo interrupter 63a (S53 in FIG. 8). When the number of input edges exceeds the predetermined number (Yes in S65 of FIG. 8), the second photo interrupt 63b is turned on (S67 of FIG. 8) and switched to the quadruple phase difference counting mode (S71 of FIG. 8).

  Thus, while the user is rotating the range ring 51, the rotation amount and the rotation direction of the range ring 51 are detected based on the signals from the first and second photo interrupters 63a and 63b. While the user is not rotating the distance ring 51, the operation state of the distance ring 51 is monitored by turning on the first photo interrupter 63a and turning off the second photo interrupter 63b.

  That is, the flowchart in the present embodiment enables some of the plurality of signals of the signal generation unit in the operation standby state (operation standby state UW) of the ring member (distance ring 51) (S59 in FIG. 8), The number of changes in the effective part of the signals output by the signal generator is counted (S61 in FIG. 8), and when the count exceeds a predetermined threshold value, the operation shifts to the ring member operation detection state (S65 Yes in FIG. 8). , S67, S71), when the operation detection state is entered, the rotation amount and the rotation direction of the ring member are detected based on the plurality of signals having different phases output from the signal generation unit, and the rotation amount and the rotation direction are detected. The movement of the focus adjustment lens is controlled (S21 to S37 in FIG. 7). Therefore, the power consumption can be reduced, and when the user operates the distance ring 51, the rotation amount and the rotation direction can be quickly detected.

  Next, a modified example of the embodiment of the present invention will be described. First, the first modification will be described. In one embodiment of the present invention, when the user operation waiting state UW is switched to the user operation state UO, the number of input edges from the first and second photo interrupters 63a and 63b is counted after the switching to drive the focus lens 11b. Was performed (S27 to S37 in FIG. 7). In the first modification, in the user operation waiting state UW, the number of edges that is a predetermined coefficient times the number of detected edges is added to the number of edges detected during the user operation, and the focus drive amount is calculated to drive the lens. ing.

  That is, in the user operation waiting state UW, only the first photo interrupter (MFI1) 63a is turned on, and the number of MF edges from the first photo interrupter 63a is detected in this state. When the number of edges becomes larger than a predetermined value, the state is switched to the user operation state UO (S65 Yes, S67, S71 in FIG. 8). At the time of this switching, the number of MF edges detected until switching is multiplied by a coefficient, and this is added to the MF drive amount, and the drive amount of the focus lens 11b is calculated and drive control is performed.

  When the second photo interrupter 63b is also turned on when adding to the drive amount, the number of MF edges is doubled, so the number may be doubled. In addition, the addition is performed in consideration of the direction of the edge of the two-phase PI detected in the user operation state.

  As described above, in this modification, the control unit (for example, the CPU 41) shifts the focus to the operation detection state (user operation state UO) and then adjusts the focus based on the number of detected signals output from the signal generation unit. When controlling the movement of the lens, the correction count number obtained by multiplying the count number detected in the operation standby state (user operation standby state UW) by a predetermined coefficient is added to the detected number of signals output from the signal generation unit. I try to control it. Therefore, the number of edges detected in the operation standby state can be effectively utilized, and the operation feeling can be improved.

  Next, a second modification will be described. In the embodiment of the present invention, in the user operation waiting state UW, the detection of the first photo interrupter 63a is performed by the periodic process by polling. In the second modification, in the user operation waiting state UW, the detection of the first photo interrupter 63a is performed by interrupt processing to detect the user operation.

  That is, in the description of one embodiment, the process of detecting every monitoring period by polling is performed, but in the present modification, the interrupt process is set in the input circuit of the CPU 41 that inputs the output of the first photo interrupter 63a. When the output of the first photo interrupter 63a generates an interrupt signal, the CPU 41 switches between the user operation state UO and the operation waiting state UW.

  As described above, in the present modification, the control unit (for example, the CPU 41) has the interrupt processing circuit, and in the operation standby state (user operation standby state UW), the control unit notifies the interrupt processing circuit of the signal generation unit. The output is input, and counting of the number of signals output by the signal generation unit is started based on the output of the interrupt processing circuit. Therefore, it is not necessary to periodically detect the output state of the signal generation unit in the operation standby state, and it is possible to reduce power consumption.

  Next, a third modification will be described. In one embodiment of the present invention, the outputs of the first and second photo interrupters 63a and 63b are binarized by the first and second binarization circuits 61a and 61b, and the result is output to the CPU 41. It was In this modification, the first and second photo interrupters 63a and 63b are connected in parallel to the A / D port in the CPU 41, and the output from the photo interrupter is detected by the A / D converter at the voltage level, or It also detects the speed at which the voltage level changes. Based on the detection result, it is added to the lens drive amount.

  In the third modification, since the change in the rotation operation of the range ring 51 is detected by the voltage level, it is possible to detect whether the range ring operation is a slow user operation or a fast user operation depending on how the voltage changes. The operation feeling can be improved by changing the moving speed of the focus lens 11b according to the speed of the user operation.

  Next, a fourth modification will be described. In the embodiment of the present invention, in the user operation waiting state UW, only the first photo interrupter 63a (MFI1) is turned on and the second photo interrupter 63b (MFI2) is turned off. On the other hand, in this modification, in the user operation waiting state UW, the first and second photo interrupters 63a and 63b are periodically turned on / off, and the detection states of the two photo interrupters are compared with those of the previous time. By doing so, the user operation is detected.

  That is, in this modification, both the first and second photo interrupters (MFP I1, 2) 63a and 63b are periodically turned on / off in the user operation waiting state UW. Then, the output state (H or L) from the two photo interrupters is detected, and the user operation can be detected by comparing with the previous state. Since there is a period during which both the photo interrupters can be turned off, the power consumption reduction effect can be improved. For example, if both of them are turned on for 1 ms and both of them are turned off for 3 ms, the power consumption reduction effect is greater than that of turning off one of them.

  Next, a fifth modification will be described with reference to FIG. In one embodiment of the present invention, the drive direction of the focus lens when the user operation waiting state UW is switched to the user operation state UO is based on the outputs of the first and second photo interrupters 63a and 63b detected after the switching. I was making a decision.

  On the other hand, in this modification, the states of the first and second photo interrupters 63a and 63b immediately before the state transition from the user operation waiting state UW to the user operation state UO are stored. After that, the user operation waiting state UW is entered, and by comparing the states of the first and second photo interrupters (MFP I1, 2) at the time of transition to the user operation state UO with the stored state, the distance ring of the user 51 The focus lens drive is performed by estimating the operation direction of, and adding the operation amount.

  In FIG. 9, the solid line (ch1) represents the output change of one of the first and second photo interrupters 63a and 63b, and the broken line (ch2) represents the output change of the other. For example, when the stored state is the one-dot chain line L0, that is, ch1 is L and ch2 is L. If the distance ring moves in the direction of the alternate long and short dash line LR (to the right) in FIG. 9, ch1 is H and ch2 is L. On the other hand, if it moves in the direction of the alternate long and short dash line LL (to the left), ch1 becomes H and ch2 becomes H.

  In this way, the states of the MFPIs 1 and 2 immediately before the transition to the user operation waiting state are stored, and the states of the MFPIs 1 and 2 when the state becomes the user operation state are compared again to enter the user operation state. The driving direction at the time of hitting can be quickly determined, and the operational feeling can be improved.

  As described above, in the embodiment and the modification of the present invention, the operation standby state (user operation state UO) and the operation standby state (user operation standby state UW) are provided (see FIG. 3), and the operation standby state is set. In the state, some of the plurality of signals of the signal generation unit are validated (for example, see S59 and S61 of FIG. 8), and the number of changes of the valid some signals output by the signal generation unit is counted, When the count exceeds a predetermined threshold value, the operation shifts to the operation detection state (see, for example, S65 Yes and S67 in FIG. 8), and the movement of the focus adjustment lens is controlled based on the signal output from the signal generation unit (for example, , S21 to S37 in FIG. 7).

  Therefore, when detecting the rotation state of the ring member, it is possible to reduce power consumption without providing another detection member. That is, either one of the first and second photo interrupters 63a and 63b may be turned off, or both may be turned on and off, and the rotating state of the ring member can be detected by the turned-on photo interrupt. it can. That is, since it is not necessary to provide another detection member, the size can be reduced. Moreover, since there is a light-off period, power consumption can be reduced.

  In addition, in the embodiment and the modified example of the present invention, the example in which the photo interrupter is used as the sensor for detecting the rotation of the ring member has been described. However, the present invention is not limited to this, and it is of course possible to use other sensors such as a photo reflector and a magnetic sensor.

  Further, in the embodiment and the modification of the present invention, a digital camera is used as a device for photographing, but the camera may be a digital single lens reflex camera or a compact digital camera, a video camera, a movie camera. Such a camera for moving images may be used, and further, a camera built in a mobile phone, a smartphone, a personal digital assistant, a personal computer (PC), a tablet computer, a game machine, or the like may be used. In any case, the present invention can be applied to any device for photographing that is capable of manual focusing.

  Further, among the techniques described in this specification, the control mainly described in the flowchart is often settable by a program and may be stored in a recording medium or a recording unit. The recording medium and the recording unit may be recorded at the time of product shipment, may be used as a distributed recording medium, or may be downloaded via the Internet.

  In addition, regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using words that express the order of “first”, “next”, and the like for convenience, It does not mean that implementation in this order is essential.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements within a range not departing from the gist of the invention in an implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some of all the constituent elements shown in the embodiment may be deleted. Furthermore, the constituent elements of different embodiments may be combined appropriately.

11a to 11c ... Lens, 13 ... Aperture, 21 ... Aperture drive mechanism, 23 ... Aperture reference position detection unit, 25 ... Focus lens drive mechanism, 27 ... Focus lens reference position detection Section, 31 ... RF position detection section, 33 ... RF mode detection section, 34 ... Zoom position detection section, 35 ... MF position detection section, 37 ... Storage section, 41 ... CPU , 43 ... A / D converter, 44 ... A / D converter, 51 ... Distance ring, 52 ... Zoom ring, 61a ... First MFPI binarization circuit, 61b. ..Second MFPI binarization circuit, 63a ... First MFPI, 63b ... Second MFPI, 65 ... MPI driver, 67 ... FCPI binarization circuit, 69 ... LDPI, 71 ... Motor driver, 73 ... LD motor, 7 ... AV motor, 77 ... AV photo interrupter, 79 ... AV photo interrupter binarization circuit, 81 ... Linear encoder RF position detection unit, 82 ... Linear encoder ZM position detection unit, 83 ... ..RF / MF mode detection SW, 100 ... Interchangeable lens, 200 ... Camera body, 201 ... Imaging element, 203 ... CPU, 205 ... Storage section, 207 ... Operation input section

Claims (7)

A focus adjustment lens that is movable in the optical axis direction and is provided in the lens barrel including the taking lens,
A ring member rotatably arranged with respect to the lens barrel,
A signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member,
Control for detecting the rotation amount and the rotation direction of the ring member based on a plurality of signals having different phases output from the signal generation unit, and controlling the movement of the focus adjustment lens according to the detected rotation amount and the rotation direction. Department,
Have
The control unit has an operation detection state and an operation standby state, validates a part of the plurality of signals of the signal generating unit in the operation standby state, and outputs the valid signal output from the signal generating unit. counting the number of changes in the part of the signal, the count is shifted to the operation detecting state when exceeding a predetermined threshold value, and controls the movement of the focusing lens based on a signal output of the signal generator ,
The control unit refers to the output of the signal generation unit at a first predetermined interval in the operation standby state, and refers to the output of the signal generation unit at a second predetermined interval in the operation detection state, The focus adjustment device is characterized in that the predetermined interval is smaller than the second predetermined interval .   The focus adjustment device according to claim 1, wherein the control unit controls the signal generation unit to operate in the operation standby state with lower power consumption than in the operation detection state. A focus adjustment lens that is movable in the optical axis direction and is provided in the lens barrel including the taking lens,
A ring member rotatably arranged with respect to the lens barrel,
A signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member,
Control for detecting the rotation amount and the rotation direction of the ring member based on a plurality of signals having different phases output from the signal generation unit, and controlling the movement of the focus adjustment lens according to the detected rotation amount and the rotation direction. Department,
Have
The control unit has an operation detection state and an operation standby state, validates a part of the plurality of signals of the signal generating unit in the operation standby state, and outputs the valid signal output from the signal generating unit. Counts the number of changes in some signals, shifts to the operation detection state when the count exceeds a predetermined threshold, and controls the movement of the focus adjustment lens based on the signal output from the signal generation unit. ,
When the control unit controls the movement of the focus adjustment lens based on the number of detected signals output from the signal generation unit after shifting to the operation detection state, the count detected in the operation standby state the number of correction count multiplied by a predetermined coefficient number, the signal generation unit of the output signal the detected number to the addition to the control to that focal point adjuster, characterized in that the. The control unit has an interrupt processing circuit,
In the operation standby state, the control unit inputs the output of the signal generation unit to the interrupt processing circuit and starts counting the number of signals output by the signal generation unit based on the output of the interrupt processing circuit. The focus adjusting device according to any one of claims 1 to 3 , wherein: The signal generation unit is composed of a plurality of pairs of photosensors and light emitting unit,
The focus adjustment apparatus according to claim 2, wherein the control unit reduces power consumption of the signal generation unit by turning off the power of the light emitting unit. A focus adjustment lens that is movable in the optical axis direction and is provided in the lens barrel including the taking lens,
A ring member rotatably arranged with respect to the lens barrel,
A signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member,
In the focus adjusting method of the focus adjusting device having
A step of enabling a part of the plurality of signals of the signal generating section in an operation standby state of the ring member,
Counting the number of changes of the effective part of the signal output by the signal generator, and transitioning to the operation detection state of the ring member when the count exceeds a predetermined threshold,
When shifting to the operation detection state, the rotation amount and the rotation direction of the ring member are detected based on the plurality of signals having different phases output from the signal generation unit, and the focus is determined according to the detected rotation amount and the rotation direction. and controlling the movement of the adjusting lens,
In the operation standby state, the output of the signal generation unit is referred to at a first predetermined interval, and in the operation detection state, the output of the signal generation unit is referred to at a second predetermined interval, and the first predetermined interval is the above. A step of setting smaller than a second predetermined interval,
A focus adjusting method comprising: A focus adjustment lens that is movable in the optical axis direction and is provided in the lens barrel including the taking lens,
A ring member rotatably arranged with respect to the lens barrel,
A signal generation unit that generates a plurality of signals having different phases according to the rotation of the ring member,
In the focus adjusting method of the focus adjusting device having
A step of enabling a part of the plurality of signals of the signal generating section in an operation standby state of the ring member,
Counting the number of changes of the effective part of the signal output by the signal generator, and transitioning to the operation detection state of the ring member when the count exceeds a predetermined threshold,
When shifting to the operation detection state, the rotation amount and the rotation direction of the ring member are detected based on the plurality of signals having different phases output from the signal generation unit, and the focus is determined according to the detected rotation amount and the rotation direction. Controlling the movement of the adjusting lens,
After shifting to the operation detection state, when controlling the movement of the focus adjustment lens based on the number of detected signals output from the signal generator, a predetermined coefficient is added to the count number detected in the operation standby state. And a step of controlling by adding the correction count number multiplied by the detected number of the signal output from the signal generation unit,
A focus adjusting method comprising:

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