Control device, lens device, imaging device, control method, and program

Abstract

This invention provides a control device that can acquire high-resolution analog signals while consuming low power. [Solution] A control device connectable to an operating device (300) that outputs a voltage corresponding to an operating position, comprising: first to third amplification circuits (106, 107, 108) that amplify a voltage at first to third amplification factors; setting means (109, 110) for setting reference voltages for the second and third amplification circuits, respectively; conversion means (111) for converting the output voltages amplified by the first to third amplification circuits into first to third voltage data; generation means (112) for generating operating position data corresponding to an operating position; and control means (113) for controlling an object based on the operating position data, wherein the generation means generates operating position data using at least one of a pair of reference voltage of the second amplification circuit and second voltage data, and a pair of reference voltage of the third amplification circuit and third voltage data.

Description

Technical Field

[0001] The present invention relates to a control device, a lens device, an imaging device, a control method, and a program.

Background Art

[0002] Conventionally, as an operating device for electrically operating a lens device, an inexpensive and low-power analog control demand is known. Usually, in an AD converter provided in a lens device for obtaining an analog voltage of an analog control demand, it is difficult to obtain the analog voltage with high resolution. Patent Document 1 discloses an amplifier in which gain and offset can be adjusted so as to increase the resolution of an AD converter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A control device capable of obtaining a high-resolution analog signal while consuming low power is desired.

Means for Solving the Problems

[0005] A control device as one aspect of the present invention is a control device that can be connected to an operating device that outputs a voltage corresponding to an operating position, and comprises: a first amplification circuit that amplifies the voltage by a first amplification factor; a second amplification circuit that amplifies the voltage by a second amplification factor; a third amplification circuit that amplifies the voltage by a third amplification factor; setting means for setting the reference voltages of the second and third amplification circuits, respectively; conversion means for converting the output voltages amplified by the first to third amplification circuits into first to third voltage data; generation means for generating operating position data corresponding to the operating position; and control means for controlling an object based on the operating position data, wherein the generation means generates the operating position data using at least one of a pair of the reference voltage of the second amplification circuit and the second voltage data, and a pair of the reference voltage of the third amplification circuit and the third voltage data.

[0006] Other objects and features of the present invention are described in the following embodiments. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a control device that can acquire high-resolution analog signals while consuming low power. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing the configuration of the imaging system in the first embodiment. [Figure 2] This is a peripheral circuit diagram of the amplifier and AD converter in the first embodiment. [Figure 3] This figure shows the relationship between the conversion value of the AD converter and the command voltage in the first embodiment. [Figure 4] This is a data table used to set the offset from the position command (low resolution) in the first embodiment. [Figure 5] This is a setting data table for the DA converter stored for setting the offset in the first embodiment. [Figure 6]This is the reference position data for creating position commands in each embodiment. [Figure 7] This diagram illustrates the interpolation process for overlapping portions in each embodiment. [Figure 8] This is a flowchart showing the method for creating a position command in the first embodiment. [Figure 9] This is a diagram showing the configuration of the imaging system in the second embodiment. [Figure 10] This figure shows the types of position commands generated in the second embodiment. [Figure 11] This is a DA converter setting data table stored for offset setting in the second embodiment. [Figure 12] This figure shows the types of position commands according to the focus speed in the second embodiment. [Figure 13] This figure shows the types of position commands due to position errors in the second embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0010] (First Embodiment) First, with reference to Figure 1, the imaging system 10 in the first embodiment of the present invention will be described. Figure 1 is a configuration diagram of the imaging system 10. The imaging system 10 includes a lens device (control device) 100, a camera body (imaging device) 200, and a focus demand (operating device) 300. In this embodiment, the lens device 100 is configured to be detachably attached to the camera body 200. However, this embodiment is not limited to this and can also be applied to imaging devices in which the lens device and the camera body are integrally configured.

[0011] The lens device 100 has an optically-operable member (imaging optical system) that can be operated electrically. The optical member includes a focus lens 102, a zoom lens 103, and an aperture (iris diaphragm) 104. In this embodiment, since the configurations related to the electric operations of the focus lens 102, the zoom lens 103, and the aperture 104 are equivalent, only the configuration related to the electric operation of the focus lens 102 will be described in this embodiment.

[0012] The focus demand 300 is an operating device for electrically operating the focus lens 102. The focus demand 300 is configured to be connectable to the lens device 100 via the connector 105 of the lens device 100. By connecting the focus demand 300 to the connector 105, a command signal in the form of an analog voltage for electrically operating the focus lens 102 is input from the focus demand 300 to the lens device 100 through the connector 105. This command signal is an analog voltage corresponding to the operating position of the focus demand 300.

[0013] The AD converter (conversion means) 111 digitally converts (AD-converts) the analog voltage output from the focus demand 300. The AD converter 111 has a three-channel configuration, and these three channels are respectively called ch1, ch2, and ch3. Signals voltage-converted by an amplifier that amplifies the analog voltage output from the focus demand 300 are input to channels ch1, ch2, and ch3 of the AD converter 111, respectively.

[0014] The amplifier includes a first amplifier circuit (AMP1) 106, a second amplifier circuit (AMP2) 107, and a third amplifier circuit (AMP2) 108. The first amplifier circuit 106 amplifies the analog voltage output from the focus demand 300 at a first amplification rate. The second amplifier circuit 107 amplifies the analog voltage output from the focus demand 300 at a second amplification rate. The third amplifier circuit 108 amplifies the analog voltage output from the focus demand 300 at a third amplification rate. In the present embodiment, each of the second amplification rate and the third amplification rate is larger than the first amplification rate. Preferably, the second amplification rate and the third amplification rate are the same as each other.

[0015] The first amplifier circuit 106 is an amplifier circuit for reading the entire analog voltage output from the focus demand 300 at channel ch1 of the AD converter 111. The second amplifier circuit 107 and the third amplifier circuit 108 are amplifier circuits for expanding a part of the analog voltage output from the focus demand 300 and respectively capturing it into channels ch2 and ch3 of the AD converter 111.

[0016] The ch2 offset switching circuit 109 and the ch3 offset switching circuit 110 can switch the region for expanding the analog voltage of the focus demand 300 by switching the offsets of the second amplifier circuit 107 and the third amplifier circuit 108, respectively. The ch2 offset switching circuit 109 and the ch3 offset switching circuit 110 are setting means for setting the reference voltage (offset voltage, second reference voltage) of the second amplifier circuit 107 and the reference voltage (offset voltage, third reference voltage) of the third amplifier circuit 108, respectively.

[0017] The AD converter 111 converts the respective output voltages amplified by the first amplifier circuit 106, the second amplifier circuit 107, and the third amplifier circuit 108 into first voltage data, second voltage data, and third voltage data, which are digital data, respectively.

[0018] The control creation unit (generation means) 112 generates operation position data (position command), which is digital data corresponding to the operation position of the focus demand 300. The control creation unit 112 also sets the offset switching settings for the ch2 offset switching circuit 109 and the ch3 offset switching circuit 110.

[0019] The focus position detection unit (position detection means) 115 detects the position (focus position, current position) of the focus lens 102 in the optical axis direction. The focus position detection unit 115 includes an encoder and an encoder counting unit, but their description is omitted here. The focus control unit (control means) 113 generates a focus drive signal based on the position command (operation position data) generated by the control creation unit 112 and the focus position detected by the focus position detection unit 115. In other words, the focus control unit 113 controls the focus lens 102 to the target position corresponding to the operation position data (position command). In this embodiment, the object controlled based on the operation position data is the focus lens 102, but it is not limited to this, and other components other than the focus lens 102 may be used as the object.

[0020] The focus control unit 113 controls the focus drive unit 114 with a focus drive signal, thereby electrically operating the focus lens 102 (moving it in the optical axis direction). The focus drive unit 114 includes a motor and a motor drive circuit, but a detailed explanation is omitted here.

[0021] The camera body 200 has an image sensor 201 such as a CMOS (Complementary Metal-Oxide-Semiconductor) sensor or a CCD (Charge Coupled Device) sensor. The image sensor 201 converts the optical image formed by the imaging optical system of the lens device 100 into photoelectric power.

[0022] Figure 2 is a peripheral circuit diagram of the amplifier and AD converter 111 in this embodiment, and includes the first amplification circuit 106, the second amplification circuit 107, the third amplification circuit 108, the AD converter 111, and the offset switching circuit of the control creation unit 112.

[0023] In this embodiment, the AD converter 111 is a 12-bit AD converter built into the CPU 120. Therefore, an external AD converter is not required in this embodiment. The first amplification circuit 106 is an amplifier for reading the entire range of the analog voltage of the focus demand 300. In this example, the input voltage of the AD converter 111 and the entire range of the analog voltage of the focus demand 300, from 0V to 3V, are mutually identical. Therefore, in order to directly input the analog voltage of the focus demand 300 into channel ch1 of the AD converter 111, the first amplification circuit 106 in this embodiment is an amplifier with a gain of 1.

[0024] The resistor values ​​of the second amplifier circuit 107 and the third amplifier circuit 108 are determined so that they act as amplifiers that gain a portion of the analog voltage of the focus demand 300 by 64x. The ch2 offset switching circuit 109 of the second amplifier circuit 107 and the ch3 offset switching circuit 110 of the third amplifier circuit 108 correspond to the DA converter 121, and the offset voltage can be set. The offset voltage is set based on the DA control signal of the CPU 120. The DA control signal is output from the control creation unit 112. In addition, the power supply voltage of the second amplifier circuit 107 and the third amplifier circuit 108 is 3V, and the output voltage of the second amplifier circuit 107 and the third amplifier circuit 108 is limited to the range of 0V to 3V.

[0025] Figure 3 shows the relationship between the converted value of the AD converter 111 and the command voltage. Figure 3 is a graph showing how the analog voltage of the focus demand 300, amplified by the first amplifier circuit 106, the second amplifier circuit 107, and the third amplifier circuit 108, is input to channels ch1, ch2, and ch3 of the AD converter 111 and converted. In Figure 3, the horizontal axis represents the analog voltage of the focus demand 300 (command voltage 0V to 3V), and the vertical axis represents the output value of the AD converter 111 (AD conversion value). Also in Figure 3, the conversion region for channels ch1 to ch3 is shown for the entire range of the analog voltage of the focus demand 300.

[0026] Channels ch2 and ch3 perform 12-bit AD conversion by switching the conversion region when offset voltages (second reference voltage and third reference voltage) are set for the second amplifier circuit 107 and the third amplifier circuit 108, respectively, by the control creation unit 112. The offset voltage is set from the conversion result of channel ch1 using the position command (low resolution) shown in Figure 6 and the setting value for the DA converter 121 within the range of the position command (low resolution) shown in Figure 4. For channels ch2 and ch3, only adjacent regions within the analog voltage of the focus demand 300 from 0V to 3V are selected. For example, the combinations are ch2(1) and ch3(1), ch3(1) and ch2(2), or ch2(2) and ch3(2) as shown in Figure 3.

[0027] Channels ch2 and ch3 share a common overlap region. For a focus demand of 300, the analog voltage is 0V to 3V, with a voltage range of 3V / 256, and the AD conversion value is 100h.

[0028] Figure 4 shows a data table used to set the offset from the position command (low resolution), and is used when generating the position command from the conversion results of channels ch1, ch2, and ch3 in the AD converter 111. The focus position command is created by extending the 12-bit conversion value converted by channel ch1 of the AD converter 111 by 6 bits to create 18-bit data. This command is called the position command (low resolution). The position command (low resolution) has values ​​from 0h to 3FFC0h, and the resolution is 3Fh.

[0029] Figure 5 shows the DA converter setting data table stored for offset setting. The AD conversion values ​​converted by channels ch2 and ch3, and the reference positions (second and third reference voltages) for converting each region into position commands are set. Position commands (operational position data) can be created according to the following relationship.

[0030] Position command = AD conversion value + reference position The position command created here is called the position command (high resolution). For example, if the AD conversion result of ch2(32) is 400h, and from ch2(3) in Figure 5, the position command (high resolution) is obtained as follows.

[0031] Position command = 400h + 4000h-400h =4000h In this embodiment, the lens device 100 has a ROM (storage means) 116 that holds table data showing the relationship between first voltage data, a second reference voltage, and a third reference voltage. The ch2 offset switching circuit 109 and the ch3 offset switching circuit 110 can use the table data stored in the ROM 116 to set the second reference voltage and the third reference voltage corresponding to the first voltage data.

[0032] Figure 7 is an explanatory diagram of the interpolation process in the overlapping section (overlap region). Channels ch2 and ch3 shown in Figure 3 perform interpolation by weighting the position commands (second operation position data and third operation position data) of channels ch2 and ch3 in relation to the calculation of position commands in the overlapping section, and adding these values ​​together. Here, the weighting is a value that indicates the degree to which the ch2 position command (second operation position data) and the ch3 position command (third operation position data) influence each other's position command (operation position data).

[0033] Let y and yy be the overlap values ​​of the ch2 position command and the ch3 position command, respectively. Let y0 and yy0 be the minimum values ​​of the overlap portion, and yk and yyk be the maximum values, respectively. By multiplying y and yy by the weights of y0 to yk linearly from 0% to 100% and yy0 to yyk linearly from 100% to 0%, and then summing them up, the position command Y (operation position data) can be calculated, and the position command Y can be expressed as follows.

[0034] Y=y*(yk-y) / (yk-y0)+yy*(yy-yy0) / (yyk-yy0) The result is a straight line interpolating the overlap portion in Figure 7. The overlap portion is interpolated by the second amplifier circuit 107 and the third amplifier circuit 108 of ch2 and ch3, respectively, to prevent discontinuities in the values ​​from occurring during switching due to variations in the gain and offset of the amplifiers.

[0035] Figure 8 is a flowchart showing the method for generating a position command (high resolution) in this embodiment. First, in step S1, the control creation unit 112 obtains the ch1 conversion value of the AD converter 111. Next, in step S2, the control creation unit 112 creates a position command (low resolution) from the ch1 conversion value. Next, in step S3, the control creation unit 112 checks which range in Figure 4 the created position command (low resolution) falls into and sets the offset voltage shown in Figure 4 to the DA converter 121. Next, in step S4, the control creation unit 112 obtains the magnitude relationship between the ch2 region and the ch3 region using Figure 4.

[0036] Next, in step S5, the control creation unit 112 resets the counter Count to 0 in order to wait for the signal to stabilize after switching from the offset setting in step S3. Next, in step S6, the control creation unit 112 increments Count. Next, in step S7, the control creation unit 112 determines whether the counter Count is greater than the waiting time WAIT_TIME. If the counter Count is not greater than the waiting time WAIT_TIME, the unit returns to step S6 and repeats incrementing the counter Count. On the other hand, if the counter Count is greater than the waiting time WAIT_TIME, the unit proceeds to step S8.

[0037] In step S8, the control creation unit 112 obtains the conversion values ​​for channels ch2 and ch3. Then, in step S9, the control creation unit 112 determines whether the ch2 area is smaller than the ch3 area. If the ch2 area is smaller than the ch3 area, the process proceeds to step S10. If the ch2 area is not smaller than the ch3 area, the process proceeds to step S14.

[0038] In step S10, the control creation unit 112 determines whether the converted value of ch2 is FFFh. If the converted value of ch2 is FFFh, the process proceeds to step S11. On the other hand, if the converted value of ch2 is not FFFh, the process proceeds to step S12.

[0039] In step S11, the control creation unit 112 creates a position command (high resolution) from the converted value of ch3. Then it returns to step S1 and repeats the operation starting from acquiring ch1.

[0040] In step S12, the control creation unit 112 determines whether the converted value of ch2 is less than the overlap portion. If the converted value of ch2 is less than the overlap portion, the process proceeds to step S13. On the other hand, if the converted value of ch2 is greater than or equal to the overlap portion, the process proceeds to step S18.

[0041] In step S13, the control creation unit 112 creates a position command (high resolution) from the converted value of ch2. Then it returns to step S1 and repeats the operation starting from acquiring ch1.

[0042] In step S18, the control creation unit 112 creates a position command (high resolution) using the overlap processing shown in Figure 7. Then, it returns to step S1 and repeats the operation starting from acquiring ch1.

[0043] Steps S14 to S17 are the same as steps S10 to S13 except that ch3 and ch2 are swapped, so their explanation will be omitted.

[0044] As described above, the control creation unit 112 generates operation position data (position command (high resolution)) using at least one of the pair of a second reference voltage (ch2 reference position) and second voltage data, and the pair of a third reference voltage (ch3 reference position) and third voltage data.

[0045] In this embodiment, when creating position commands for overlapping regions (overlap portions), interpolation processing was performed by weighting two signals. However, this is not limited to this method, and processing may be performed using only one of the signals.

[0046] (Second Embodiment) Next, with reference to Figure 9, the imaging system 10a in the second embodiment of the present invention will be described. Figure 9 is a configuration diagram of the imaging system 10a. The imaging system 10a includes a lens device (control device) 100a, a camera body (imaging device) 200, and a focus demand (operating device) 300. In this embodiment, the lens device 100a is configured to be detachably attached to the camera body 200. However, this embodiment is not limited to this and can also be applied to imaging devices in which the lens device and the camera body are integrally configured.

[0047] The lens device 100a of this embodiment differs from the lens device 100 described in the first embodiment with reference to Figure 1 in that it has a focus speed detection unit (speed detection means) 118 and a position error detection unit 117 provided in the focus control unit 113. The focus speed detection unit 118 detects the speed (velocity) of the focus lens 102. The position error detection unit 117 detects the difference (position error signal) between the focus position command (target position) and the focus position (current position), and the position error signal is output to the control creation unit 112.

[0048] This embodiment differs from the first embodiment in that it changes the ch2 reference position (second reference voltage) and ch3 reference position (third reference voltage) shown in Figure 6 according to the speed (velocity) of the focus lens 102 detected by the focus speed detection unit 118. Figure 6 shows the reference position data for creating a position command. According to this embodiment, the range of the overlap portion of ch2 and ch3 can be changed according to the speed (focus speed) of the focus lens 102. In this embodiment, the ch2 reference position and ch3 reference position may also be changed according to the difference between the focus position command (target position) and the focus position (current position).

[0049] Figures 10(A) to (C) show the types of position command generation. Figure 10(A) shows a position command (high resolution) in which the reference positions of ch2 and ch3 are set so that the overlap portion of ch2 and ch3 is small. When the speed of the focus lens 102 is medium, after the reference position switching of ch2 and ch3, the area that can be read by ch2 and ch3 is widened from input signal stabilization to AD conversion, which has the effect of preventing the input signal from being lost.

[0050] Figure 10(B) shows a position command (high resolution) in which the reference position of ch2 (second reference voltage) and the reference position of ch3 (third reference voltage) are set so that the overlap area of ​​ch2 and ch3 is large. When the speed of the focus lens 102 is low, the overlap area of ​​ch2 and ch3 is large, and the interpolation range in Figure 7 is also widened. Therefore, smoother interpolation is possible compared to Figure 10(A).

[0051] In Figure 10(C), when the speed of the focus lens 102 is high with a position command (low resolution), after the reference position switching of ch2 and ch3, the input signal moves out of the region that can be read by ch2 and ch3 before the input signal stabilizes and AD conversion is performed. However, in the case of high-speed operation, even without a high-resolution position command, it does not affect the rate of change of speed, and it is possible to avoid a state where reading is not possible by using a low-resolution position command.

[0052] Figure 12 shows the types of position commands according to the focus speed. The three position commands shown in Figures 10(A) to (C) are generated according to the focus speed. In Figure 12, the vertical axis represents the focus position and focus speed, and the horizontal axis represents time. The generation of Figures 10(A), (B), and (C) is switched based on the relationship between the focus speed and focus speed determination line 1 and focus speed determination line 2.

[0053] If the focus speed is less than focus speed determination line 1, the focus speed is determined to be slow, and the position signal shown in Figure 10(A) is generated. If the focus speed is greater than or equal to focus speed determination line 1 and less than focus speed determination line 2, the focus speed is determined to be medium, and the position signal shown in Figure 10(B) is generated. If the focus speed is greater than or equal to focus speed determination line 2, the focus speed is determined to be fast, and the position signal shown in Figure 10(C) is generated.

[0054] The settings for the ch2 reference position (second reference voltage) and ch3 reference position (third reference voltage) in Figures 10(A) and (B) are changed by referring to Figure 11, using the stored values ​​shown in Figure 4 for both Figure 10(A) and Figure 10(B). Figure 11 is the DA converter setting data table stored for offset setting.

[0055] In this embodiment, the three position commands shown in Figures 10(A), (B), and (C) may be generated in accordance with the position error, which is the difference between the focus position command (target position) and the focus position (current position). Figure 13 is a diagram showing the types of position commands based on the position error. In Figure 13, the vertical axis represents the focus position, and the horizontal axis represents time. Focus position error determination line 1 and focus position error determination line 2 are lines that show the degree of distance from the position command. If the focus position is below these lines, the position error widens. On the other hand, if the focus position is above these lines, the position error becomes smaller.

[0056] If the focus position is at or above the focus speed determination line 1, the position error is determined to be small, and the position signal shown in Figure 10(A) is generated. If the focus position is less than the focus position error determination line 1 but at or above the focus position error determination line 2, the position error is determined to be moderate, and the position signal shown in Figure 10(B) is generated. If the focus position is less than the focus position error determination line 2, the position error is determined to be large, and the position signal shown in Figure 10(C) is generated.

[0057] In this embodiment, the control creation unit 112 generates operation position data using the first voltage data when the speed of the focus lens 102 is faster than a predetermined speed. On the other hand, when the speed of the focus lens 102 is slower than a predetermined speed, it generates operation position data using at least one of the pair of a second reference voltage and second voltage data and the pair of a third reference voltage and third voltage data.

[0058] In this embodiment, the control creation unit 112 generates operation position data using the first voltage data if, for example, the difference between the target position and the current position of the focus lens 102 is greater than a predetermined amount. On the other hand, if the difference is less than a predetermined amount, it generates operation position data using at least one of the pair of the second reference voltage and the second voltage data, and the pair of the third reference voltage and the third voltage data.

[0059] In each embodiment, a focus demand 300 that outputs an analog voltage corresponding to rotational operation was described as an example of an operating device, but it is not limited to this. Each embodiment can also be applied to other operating devices that output an analog voltage corresponding to operations other than rotational operation. Furthermore, in each embodiment, the object of operation is a focus lens (an optical component such as a lens), but it is not limited to this. Each embodiment can also be applied to operating devices that operate objects other than lenses.

[0060] (Other embodiments) The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0061] According to each embodiment, it is possible to provide a control device, lens device, imaging device, control method, and program that can acquire high-resolution analog signals while consuming low power.

[0062] Each embodiment of the disclosure includes the following configuration and method. (Composition 1) A control device that can be connected to an operating device that outputs a voltage corresponding to the operating position, A first amplification circuit that amplifies the aforementioned voltage with a first amplification factor, A second amplification circuit that amplifies the aforementioned voltage with a second amplification factor, A third amplification circuit that amplifies the aforementioned voltage with a third amplification factor, Setting means for setting the reference voltages of the second and third amplification circuits, A conversion means for converting the output voltages amplified by the first to third amplification circuits into first to third voltage data, A generation means for generating operation position data corresponding to the aforementioned operation position, The system includes control means for controlling an object based on the aforementioned operation position data, The control device is characterized in that the generation means generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data. (Configuration 2) The control device according to configuration 1, characterized in that each of the second and third amplification factors is greater than the first amplification factor. (Composition 3) The control device according to configuration 1 or 2, characterized in that the second and third amplification factors are the same as those of the other. (Composition 4) The control device according to any one of configurations 1 to 3, characterized in that the setting means sets the reference voltage of the second amplifier circuit and the reference voltage of the third amplifier circuit based on the first voltage data. (Composition 5) The system further includes storage means for storing table data showing the relationship between the first voltage data, the reference voltage of the second amplifier circuit, and the reference voltage of the third amplifier circuit. The control device according to configuration 4, characterized in that the setting means sets the reference voltage of the second amplifier circuit and the reference voltage of the third amplifier circuit corresponding to the first voltage data using the table data. (Composition 6) The generating means is At least one of the following is generated: a second operating position data generated from the pair of the reference voltage of the second amplification circuit and the second voltage data, and a third operating position data generated from the pair of the reference voltage of the third amplification circuit and the third voltage data. A control device according to any one of configurations 1 to 5, characterized in that it determines whether to generate the operation position data using the second operation position data or the third operation position data based on the first voltage data. (Composition 7) The generating means is The system generates second operating position data from the pair of the reference voltage of the second amplification circuit and the second voltage data, and third operating position data from the pair of the reference voltage of the third amplification circuit and the third voltage data. Based on the first voltage data, the weighting of the second and third operating position data is determined. A control device according to any one of configurations 1 to 5, characterized in that it generates the operation position data using the second operation position data, the third operation position data, and the weighting. (Composition 8) The control device according to configuration 7, characterized in that the weighting is a value indicating the degree to which the second operation position data and the third operation position data each have influence on the operation position data. (Composition 9) A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a speed detection means for detecting the speed of the object, The generating means is If the speed is faster than a predetermined speed, the operation position data is generated using the first voltage data. The control device according to any one of configurations 1 to 8, characterized in that, when the speed is slower than the predetermined speed, the control device generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data. (Composition 10) A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a position detection means for detecting the current position of the object, The generating means is If the difference between the target position and the current position is greater than a predetermined amount, the operation position data is generated using the first voltage data. The control device according to any one of configurations 1 to 8, characterized in that, if the difference is smaller than the predetermined amount, the control device generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data. (Composition 11) A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a speed detection means for detecting the speed of the object, The control device according to any one of configurations 1 to 10, characterized in that the setting means changes the reference voltage of the second amplification circuit and the reference voltage of the third amplification circuit according to the speed. (Composition 12) A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a position detection means for detecting the current position of the object, The control device according to any one of configurations 1 to 10, characterized in that the setting means changes the reference voltage of the second amplification circuit and the reference voltage of the third amplification circuit according to the difference between the target position and the current position. (Composition 13) A lens device characterized by having a control device according to any one of configurations 1 to 12 and an optical system. (Composition 14) An imaging device characterized by having a control device according to any one of configurations 1 to 12 and an image sensor. (Method 1) A control method for a device that can be connected to an operating device that outputs a voltage corresponding to the operating position, The steps include amplifying the voltage at a first amplification factor using a first amplification circuit, The steps include amplifying the voltage at a second amplification factor using a second amplification circuit, The steps include amplifying the voltage at a third amplification factor using a third amplification circuit, The steps include setting the reference voltages for the second and third amplification circuits, The steps include converting the output voltages amplified by the first to third amplification circuits into first to third voltage data, The steps include generating operation position data corresponding to the aforementioned operation position, The step of controlling an object based on the aforementioned operation position data, A control method characterized in that, in the step of generating the operation position data, the operation position data is generated using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data. (Composition 15) A program characterized by causing a computer to execute the control method described in Method 1.

[0063] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. [Explanation of Symbols]

[0064] 100, 100a Lens device (control device) 106 First Amplifier Circuit 107 Second Amplifier Circuit 108 Third Amplifier Circuit 109 ch2 offset switching circuit (setting means) 110 ch3 offset switching circuit (setting means) 111 AD converter (conversion means) 112 Control creation unit (generation means) 113 Focus control unit (control means)

Claims

1. A control device that can be connected to an operating device that outputs a voltage corresponding to the operating position, A first amplification circuit that amplifies the aforementioned voltage with a first amplification factor, A second amplification circuit that amplifies the aforementioned voltage with a second amplification factor, A third amplification circuit that amplifies the aforementioned voltage with a third amplification factor, Setting means for setting the reference voltages of the second and third amplification circuits, A conversion means for converting the output voltages amplified by the first to third amplification circuits into first to third voltage data, A generation means for generating operation position data corresponding to the aforementioned operation position, The system includes control means for controlling an object based on the aforementioned operation position data, The control device is characterized in that the generation means generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data.

2. The control device according to claim 1, characterized in that each of the second and third amplification factors is greater than the first amplification factor.

3. The control device according to claim 1, characterized in that the second and third amplification factors are the same as those of the other.

4. The control device according to claim 1, characterized in that the setting means sets the reference voltage of the second amplifier circuit and the reference voltage of the third amplifier circuit based on the first voltage data.

5. The system further includes storage means for storing table data showing the relationship between the first voltage data, the reference voltage of the second amplifier circuit, and the reference voltage of the third amplifier circuit. The control device according to claim 4, characterized in that the setting means sets the reference voltage of the second amplification circuit and the reference voltage of the third amplification circuit corresponding to the first voltage data using the table data.

6. The generating means is At least one of the following is generated: a second operating position data generated from the pair of the reference voltage of the second amplification circuit and the second voltage data, and a third operating position data generated from the pair of the reference voltage of the third amplification circuit and the third voltage data. The control device according to any one of claims 1 to 5, characterized in that it determines whether to generate the operation position data using the second operation position data or the third operation position data based on the first voltage data.

7. The generating means is The system generates second operating position data from the pair of the reference voltage of the second amplification circuit and the second voltage data, and third operating position data from the pair of the reference voltage of the third amplification circuit and the third voltage data. Based on the first voltage data, the weighting of the second and third operating position data is determined. The control device according to any one of claims 1 to 5, characterized in that it generates the operation position data using the second operation position data, the third operation position data, and the weighting.

8. The control device according to claim 7, characterized in that the weighting is a value indicating the degree to which the second operation position data and the third operation position data each have influence on the operation position data.

9. A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a speed detection means for detecting the speed of the object, The generating means is If the speed is faster than a predetermined speed, the operation position data is generated using the first voltage data. The control device according to any one of claims 1 to 5, characterized in that, when the speed is slower than the predetermined speed, the control device generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data.

10. A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a position detection means for detecting the current position of the object, The generating means is If the difference between the target position and the current position is greater than a predetermined amount, the operation position data is generated using the first voltage data. The control device according to any one of claims 1 to 5, characterized in that, if the difference is smaller than the predetermined amount, the control device generates the operation position data using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data.

11. A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a speed detection means for detecting the speed of the object, The control device according to any one of claims 1 to 5, characterized in that the setting means changes the reference voltage of the second amplification circuit and the reference voltage of the third amplification circuit according to the speed.

12. A control means for controlling an object to a target position corresponding to the aforementioned operation position data, The system further includes a position detection means for detecting the current position of the object, The control device according to any one of claims 1 to 5, characterized in that the setting means changes the reference voltage of the second amplification circuit and the reference voltage of the third amplification circuit according to the difference between the target position and the current position.

13. A lens device characterized by having a control device according to any one of claims 1 to 5 and an optical system.

14. An imaging device comprising a control device according to any one of claims 1 to 5 and an image sensor.

15. A control method for a device that can be connected to an operating device that outputs a voltage corresponding to the operating position, The steps include amplifying the voltage at a first amplification factor using a first amplification circuit, The steps include amplifying the voltage at a second amplification factor using a second amplification circuit, The steps include amplifying the voltage with a third amplification factor using a third amplification circuit, The steps include setting the reference voltages for the second and third amplification circuits, The steps include converting the respective output voltages amplified by the first to third amplification circuits into first to third voltage data, The steps include generating operation position data corresponding to the aforementioned operation position, The step of controlling an object based on the aforementioned operation position data, A control method characterized in that, in the step of generating the operation position data, the operation position data is generated using at least one of the pair of the reference voltage of the second amplification circuit and the second voltage data, and the pair of the reference voltage of the third amplification circuit and the third voltage data.

16. A program characterized by causing a computer to execute the control method described in claim 15.

Images