Optical apparatus

Abstract

[Problem] To suppress deterioration in optical performance corresponding to the insertion / removal and type of a wavelength filter. [Solution] An optical device (200) is provided with: a processing means (203, 208) that performs processing pertaining to imaging when a wavelength filter (201) that controls the wavelength of imaging light incident on an image sensor (202) can be inserted or removed, said wavelength filter (201) being configured so that the wavelength of the imaging light incident on the image sensor (202) is smaller than the wavelength of the imaging light incident on the image sensor (202) and the wavelength of the imaging light incident on the image sensor (202) is smaller than the wavelength of the imaging light incident on the image sensor (202); the image sensor (202) is configured to capture a subject image formed by the optical system (101). And an acquisition section (208) configured to acquire optical information on the optical system for the processing, the optical information corresponding to a wavelength of imaging light corresponding to at least one of insertion / removal and type of the wavelength filter.

Description

Technical Field

[0001] The present invention relates to optical devices such as lens devices and imaging devices. Background Art

[0002] In an optical device in which a wavelength filter configured to control the wavelength of imaging light can be inserted and removed, narrow-band light such as infrared light can be imaged by inserting the wavelength filter, or broadband light including visible light and infrared light can be imaged by removing the wavelength filter.

[0003] Patent Document 1 discloses an optical device in which an infrared cut-off filter and a transparent glass can be selectively inserted and removed, and correction data for correcting the difference in optical path length between when the infrared cut-off filter is inserted and when the transparent glass is inserted is used to shift a flange back adjusting lens.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-162757 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in the case of using optical information optimized for narrow-band light imaging (such as sensitivity information of a focusing lens or an image stabilization lens) in broadband light imaging, the optical performance may deteriorate, and it may not be possible to obtain a high-quality captured image.

[0009] The present invention provides an optical device capable of suppressing deterioration of optical performance caused by insertion / removal and type of a wavelength filter.

[0010] Solution to the Problem

[0011] An optical device according to an aspect of the present invention includes: a processing component configured to perform processing related to imaging in a case where a wavelength filter can be inserted or removed, the wavelength filter being configured to control the wavelength of imaging light incident on an image sensor, the image sensor being configured to capture a subject image formed by an optical system; and an acquisition component configured to acquire optical information about the optical system for the processing, the optical information corresponding to the wavelength of the imaging light corresponding to at least one of insertion / removal and type of the wavelength filter.

[0012] A control method for an optical device according to another aspect of the present invention includes the following steps: performing imaging-related processing in a case where a wavelength filter can be inserted or removed, the wavelength filter being configured to control a wavelength of imaging light incident on an image sensor, the image sensor being configured to capture a subject image formed by an optical system; and acquiring optical information about the optical system for the processing, the optical information corresponding to a wavelength of imaging light corresponding to at least one of insertion / removal and type of the wavelength filter. A program that causes a computer to execute processing according to the above control method also constitutes another aspect of the present invention.

[0013] Effects of the Invention

[0014] The present invention can provide an optical device that can suppress deterioration of optical performance caused by insertion / removal and type of a wavelength filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a diagram showing a configuration of a lens interchangeable camera system according to an embodiment of the present invention.

[0016] Figure 2 is a diagram showing spectral sensitivity characteristics according to the embodiment.

[0017] Figure 3 is a flowchart showing an optical information acquisition process according to Example 1.

[0018] Figure 4 is a flowchart showing an optical information acquisition process according to Example 2.

[0019] Figure 5 is a flowchart showing an optical information acquisition process according to Example 3. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0021] Figure 1 shows a configuration of a lens interchangeable camera system according to an embodiment of the present invention. The lens interchangeable camera system includes a camera body 200 as an imaging device (optical device) and a replaceable lens 100 as a lens device that is detachable and communicably connected to the camera body 200. The replaceable lens 100 and the camera body 200 communicate with each other via communication units 111 and 209 respectively provided to the replaceable lens 100 and the camera body 200.

[0022] The interchangeable lens 100 includes an imaging optical system 101. The imaging optical system 101 includes a zoom lens 102, an aperture stop 103, an image stabilization lens (image stabilization component) 104, and a focusing lens (focusing component) 105. The interchangeable lens 100 further includes a zoom drive unit 106, an aperture drive unit 107, an image stabilization drive unit 108, a focusing drive unit 109, a lens microcomputer (hereinafter referred to as the lens microcomputer) 110, and a memory 112.

[0023] The zoom lens 102 changes the focal length of the imaging optical system 101 by moving in the optical axis direction (the arrow direction in the figure) of the imaging optical system 101, that is, changes the magnification. The zoom drive unit 106 moves the zoom lens 102 according to an instruction from the lens microcomputer 110 that obtains the position of the zoom lens 102 detected by using a position sensor such as a potentiometer (not shown).

[0024] The aperture stop 103 includes aperture blades that change the opening diameter to adjust the amount of light passing through the imaging optical system 101. The aperture drive unit 107 drives an actuator such as a stepping motor to change the opening diameter of the aperture stop 103 according to an instruction from the lens microcomputer 110 that obtains the opening diameter detected by a sensor such as a light shutter (not shown).

[0025] The image stabilization lens 104 corrects image blur caused by movement applied to the camera system (camera shake) by moving in a direction orthogonal to the optical axis of the imaging optical system 101 (the arrow direction in the figure). The image stabilization drive unit 108 drives an actuator such as a voice coil motor to move the image stabilization lens 104 according to an instruction from the lens microcomputer 110 that obtains the camera shake detected by a gyro sensor or an acceleration sensor (not shown).

[0026] The focusing lens 105 adjusts the imaging position of the imaging optical system 101 by moving in the optical axis direction of the imaging optical system 101. The focusing drive unit 109 drives an actuator such as a stepping motor to move the focusing lens 105 according to an instruction from the lens microcomputer 110 that obtains the position of the focusing lens 105 detected by a position sensor such as an encoder (not shown).

[0027] The memory 112 includes a read-only memory (ROM), a random access memory (RAM), etc., and stores optical information required to control the driving of the zoom lens 102, the aperture stop 103, the image stabilization lens 104, and the focusing lens 105. Specific examples of the optical information will be described later.

[0028] The camera body 200 includes a wavelength filter 201, an image sensor 202, a signal processing unit 203, a recording processing unit 204, a wavelength filter driving unit 207, a display unit 205, an operation unit 206, a camera microcomputer (hereinafter referred to as camera MCU) 208, and a memory 210.

[0029] The image sensor 202 is a photoelectric conversion element including a CMOS sensor, a CCD sensor, or the like, and performs photoelectric conversion (shooting) on the subject image formed by the imaging optical system 101.

[0030] The wavelength filter 201 can be inserted into and removed from a filter insertion position between the imaging optical system 101 and the image sensor 202. When inserted into the filter insertion position, the wavelength filter 201 controls (limits) the wavelength of the imaging light that passes through the wavelength filter 201 and enters the image sensor 202. The wavelength filter 201 is a filter such as an infrared cut-off filter or a band-pass filter, and the transmittance of light in a specific wavelength range is lower than the transmittance of light in other wavelength ranges. In the present embodiment, the wavelength filter 201 moves inside the camera body 200 to be inserted into or removed from the filter insertion position, but the wavelength filter 201 can be removed to a position outside the camera body 200. In the present embodiment, the filter insertion position is located between the imaging optical system 101 and the image sensor 202, but it can also be provided inside the imaging optical system.

[0031] The wavelength filter driving unit 207 inserts or removes the wavelength filter 201 from the filter insertion position by driving an actuator according to a manual operation of the user or an instruction from the camera microcomputer 208. The camera microcomputer 208 can determine whether the wavelength filter 201 has been inserted into the filter insertion position or removed from the filter insertion position, and obtain information about the type of the inserted wavelength filter 201. More specifically, the insertion or removal of the wavelength filter 201 is determined and the type information is obtained by communicating with the operation history of the wavelength filter driving unit 207 and the radio frequency identification (RFID) tag provided on the wavelength filter 201. In addition, the insertion / removal of the wavelength filter 201 can be determined and information about the type can be obtained by using a signal from a sensor (such as a light interrupter provided in the wavelength filter driving unit 207) that detects the insertion of the wavelength filter 201. In addition, information about the type of the wavelength filter 201 can be obtained based on the shape of the inserted wavelength filter 201.

[0032] In this embodiment, the wavelength filter 201 and the wavelength filter driving unit 207 are provided in the camera body 200. However, the wavelength filter 201 and the wavelength filter driving unit 207 may also be provided in the interchangeable lens 100. In this case, the wavelength filter driving unit inserts and removes the wavelength filter 201 according to a manual operation by the user or an instruction from the lens microcomputer 110.

[0033] The analog image signal output from the image sensor 202 that has captured the subject image is input to the signal processing unit 203 and converted into a digital image signal. The signal processing unit 203 performs various signal processes such as noise removal and color correction on the digital image signal to generate a video signal, a focus signal, a luminance signal, a color difference signal, and the like. The video signal output from the signal processing unit 203 is sent to the recording processing unit 204. The signal processing unit 203 generates still image data and moving image data from the video signal and records the data on a recording medium (not shown).

[0034] The focus signal output from the signal processing unit 203 is input to the camera microcomputer 208. The focus signal indicates, for example, the amount of defocus in focus detection using the phase difference detection method. The camera microcomputer 208 converts the amount of defocus into a driving amount of the focus lens 105 and sends a focus command including the driving amount to the lens microcomputer 110. The lens microcomputer 110 issues an instruction to the focus driving unit 109 based on the received focus command to drive the focus lens 105. Thereby, automatic focusing (AF) is performed.

[0035] The luminance signal output from the signal processing unit 203 is input to the camera microcomputer 208. The camera microcomputer 208 calculates the aperture value (F value), the shutter speed, and the sensitivity of the image sensor 202 such that the brightness evaluation value obtained from the luminance signal is appropriate. The camera microcomputer 208 sends an aperture command including the calculated aperture value to the lens microcomputer 110. The lens microcomputer 110 issues an instruction to the aperture driving unit 107 based on the received aperture command to drive the aperture stop 103. The camera microcomputer 208 sets the calculated shutter speed and the sensitivity of the image sensor 202. Thereby, automatic exposure (AE) is performed.

[0036] The operation unit 206 has a shooting instruction switch (not shown) and switches for setting shooting conditions, etc. The camera microcomputer 208 performs various controls according to the input from the operation unit 206.

[0037] The camera microcomputer 208 performs optical information acquisition processing as an acquisition component to acquire optical information corresponding to a wavelength (specific wavelength: hereinafter referred to as the optical information acquisition wavelength) selected by the user or automatically selected by the camera microcomputer 208 from the interchangeable lens 100. The optical information acquisition processing will be described in detail later. The camera microcomputer 208 also performs processing related to imaging, which includes controlling the imaging optical system 101 using the acquired optical information and performing image processing on the video signal generated by the signal processing unit 203 based on the output from the image sensor 202 using the optical information. The camera microcomputer 208 and the signal processing unit 203 constitute a processing component.

[0038] Figure 2 Shows the spectral sensitivity characteristics of the light received by the image sensor 202 when no wavelength filter is inserted into the filter insertion position (solid line), when an infrared cut-off filter is inserted into the filter insertion position (dashed line), and when a band-pass filter that transmits light with a wavelength of approximately 850 nm is inserted into the filter insertion position (dash-dotted line).

[0039] The spectral sensitivity characteristics when the wavelength filter is removed are consistent with the spectral sensitivity characteristics of the image sensor 202. The spectral sensitivity characteristics when the infrared cut-off filter is inserted are represented as the product of the spectral sensitivity characteristics of the infrared cut-off filter and the spectral sensitivity characteristics of the image sensor 202. The spectral sensitivity characteristics when the band-pass filter that transmits light with a wavelength of approximately 850 nm is inserted are represented as the product of the spectral sensitivity characteristics of the band-pass filter and the spectral sensitivity characteristics of the image sensor 202.

[0040] In the present embodiment, within the wavelength range having these spectral sensitivity characteristics, the optical information acquisition wavelength for acquiring optical information is selected by the user or automatically selected by the camera microcomputer 208.

[0041] Example 1

[0042] Figure 3 The flowchart in shows the optical information acquisition processing executed by the camera microcomputer 208 according to a program in the case where the user selects the optical information acquisition wavelength.

[0043] In step S100, the camera microcomputer 208 determines whether the wavelength filter 201 is inserted into the filter insertion position. If the wavelength filter 201 is inserted, the camera microcomputer 208 proceeds to step S101, and if the wavelength filter 201 is not inserted, the camera microcomputer 208 proceeds to step S103.

[0044] In step S101, the camera microcomputer 208 acquires information about the type of the wavelength filter 201 inserted into the filter insertion position.

[0045] Next, in step S102, the camera microcomputer 208 sets the optical information acquisition wavelength that can be selected by the user based on the information about the type of the wavelength filter 201 acquired in step S101. Table 1 shows the optical information acquisition wavelengths for each type of wavelength filter. The types of the wavelength filter include an infrared cut-off filter, an 850 nm band-pass filter, and a 940 nm band-pass filter. When the type of the wavelength filter 201 is an infrared cut-off filter, the selectable optical information acquisition wavelength is set to a wavelength in the range of 400 to 700 nm, and when the type is an 850 nm or 940 nm band-pass filter, the optical information acquisition wavelengths are set to 850 nm and 940 nm, respectively. Then, the process proceeds to step S104.

[0046] When the type of the wavelength filter 201 is fixed to only the infrared cut-off filter, step S101 may also be omitted, and in step S102, the optical information acquisition wavelength corresponding to the infrared cut-off filter, which is in the range of 400 to 700 nm, may be set.

[0047] On the other hand, in step S103, the camera microcomputer 208 sets the optical information acquisition wavelength that can be selected by the user when the wavelength filter 201 is not inserted. For example, as shown in Table 1, the selectable optical information acquisition wavelength is set to a wavelength in the range of 400 to 1000 nm. Then, the process proceeds to step S104.

[0048] In step S104, the camera microcomputer 208 displays on the display unit 205 the (range of) optical information acquisition wavelength that can be selected by the user and that has been set in step S102 or step S103.

[0049] When the user who views the display on the display unit 205 selects the optical information acquisition wavelength via the operation unit 206, the camera microcomputer 208 sends an optical information transmission request including the selected optical information acquisition wavelength to the lens microcomputer 100 in step S105. The lens microcomputer 110 that has received the optical information transmission request reads out the optical information corresponding to the optical information acquisition wavelength from the memory 112 and transmits the optical information to the camera microcomputer 208.

[0050] Tables 3 to 11 show examples of the optical information stored in the memory 112 corresponding to the first wavelength (400 nm) and the second wavelength (850 nm) which are the optical information acquisition wavelengths. When the selected optical information acquisition wavelength is 400 nm, the lens microcomputer 110 transmits the optical information corresponding to 400 nm to the camera microcomputer 208, and when the selected optical information acquisition wavelength is 850 nm, the lens microcomputer 110 transmits the optical information corresponding to 850 nm to the camera microcomputer 208.

[0051] Table 3 shows the actual focal lengths for respective positions (zoom positions) of the zoom lens 102 and respective subject distances, Table 4 shows the effective F values for respective zoom positions and subject distances, and Table 5 shows the imaging magnifications for respective zoom positions and subject distances. Table 6 shows the positions of the focusing lens 105 for obtaining a focused state for respective zoom positions and subject distances.

[0052] Table 7 shows the focusing sensitivities for respective zoom positions and subject distances. The focusing sensitivity is the ratio between the unit movement amount of the focusing lens 105 and the change amount of the imaging position (i.e., the back focal point).

[0053] Table 8 shows the positions of the floating lens for respective zoom positions and subject distances. Although not shown Figure 1 in the figure, the floating lens is a lens that moves as the focusing lens 105 moves to reduce the change in the viewing angle (breathing) and the aberration fluctuation.

[0054] Table 9 shows the image stabilization sensitivities for respective zoom positions and subject distances. The image stabilization sensitivity is the ratio between the unit movement amount of the image stabilization lens 104 and the amount of image shift on the image sensor 202 (in other words, the image stabilization angle around the center such as the front principal - point position).

[0055] Table 10 shows the front principal - point positions of the imaging optical system 101 for respective zoom positions and subject distances, and Table 11 shows the peripheral light quantity ratios at an image height of 15 mm for respective zoom positions and subject distances. The peripheral light quantity ratio is the ratio of the light quantity entering this image height to the light quantity at the position where the image height is 0.

[0056] Table 1

[0057] Type of wavelength filter Wavelength range Infrared cut-off filter 400~700 [nm] 850 nm band-pass filter 850 [nm] 940 nm band-pass filter 940 [nm] … … No wavelength filter 400~1000 [nm]

[0058] Table 2

[0059] Type of wavelength filter Wavelength Infrared cut-off filter 600 [nm] 850 nm band-pass filter 850 [nm] 940 nm band-pass filter 940 [nm] … … No wavelength filter 700 [nm]

[0060] Table 3 Actual focal length [mm] (wavelength 400 nm)

[0061]

[0062] Actual focal length [mm] (wavelength 850 nm)

[0063]

[0064] Table 4 Effective F value (wavelength 400 nm)

[0065]

[0066] Effective F value (wavelength 850 nm)

[0067]

[0068] Table 5 Imaging magnification (wavelength 400 nm)

[0069]

[0070] Imaging magnification (wavelength 850 nm)

[0071]

[0072] Table 6 Focus lens position [mm] (wavelength 400 nm)

[0073]

[0074] Focus lens position [mm] (wavelength 850 nm)

[0075]

[0076] Table 7 Focus sensitivity [mm / mm] (wavelength 400 nm)

[0077]

[0078] Focus sensitivity [mm / mm] (wavelength 850 nm)

[0079]

[0080] Table 8 Floating lens position [mm] (wavelength 400 nm)

[0081]

[0082] Floating lens position [mm] (wavelength 850 nm)

[0083]

[0084] Table 9 Image stabilization sensitivity [mm / mm] (wavelength 400 nm)

[0085]

[0086] Image stabilization sensitivity [mm / mm] (wavelength 850 nm)

[0087]

[0088] Front principal point position [mm] (wavelength 400 nm) in Table 10

[0089]

[0090] Front principal point position [mm] (wavelength 850 nm)

[0091]

[0092] Peripheral luminous flux ratio at image height of 15 mm [%] (wavelength 400 nm) in Table 11

[0093]

[0094] Peripheral luminous flux ratio at image height of 15 mm [%] (wavelength 850 nm)

[0095]

[0096] The optical information may be information indicating the above-mentioned actual focal length, effective F value, imaging magnification, focus lens position, focus sensitivity, floating lens position, image stabilization sensitivity, and front principal point position, or may be information convertible into each of the above-mentioned information. In other words, the optical information may be information regarding the focal length, F value, imaging magnification, focus lens position, focus sensitivity, floating lens position, image stabilization sensitivity, and front principal point position.

[0097] Next, in step S106, the camera microcomputer 208 receives the optical information transmitted from the lens microcomputer 110 and stores the optical information in the memory 210.

[0098] Thereafter, the camera microcomputer 208 uses the optical information stored in the memory 210 to perform the above-mentioned processing on imaging.

[0099] This embodiment performs various controls to drive the focus lens, image stabilization lens, and aperture stop using the optical information corresponding to the wavelength obtained using the optical information selected by the user according to the insertion / removal or type of the wavelength filter. Therefore, regardless of whether the wavelength filter is inserted or removed, or regardless of the type of the filter, good optical performance can be obtained, and as a result, high-quality captured images can be obtained.

[0100] This embodiment discusses the case where the camera body 200 uses the optical information obtained from the interchangeable lens 100 to perform imaging-related processing. However, the interchangeable lens (optical device) itself can also use the optical information to perform imaging-related processing. For example, when driving a focusing lens or an image stabilization lens based on a command from the camera body, the driving amount can be corrected based on the optical information (i.e., the imaging optical system can be controlled). The processing related to imaging also includes the processing of reading the optical information from the memory 112 and sending the optical information to the camera body 100 configured to perform imaging. This also applies to other embodiments described below. In addition, the camera body 200 can obtain the optical information from a cloud server via communication instead of from the interchangeable lens 100.

[0101] Example 2

[0102] Figure 4 The flowchart in shows the optical information acquisition process executed by the camera microcomputer 208 that automatically sets the optical information acquisition wavelength according to a program.

[0103] In step S200, the camera microcomputer 208 determines whether the wavelength filter 201 is inserted into the filter insertion position. If the wavelength filter 201 is inserted, the camera microcomputer 208 proceeds to step S201. If the wavelength filter 201 is not inserted, the camera microcomputer 208 proceeds to step S203.

[0104] In step S201, the camera microcomputer 208 acquires information about the type of the wavelength filter 201 inserted into the filter insertion position.

[0105] Next, in step S202, the camera microcomputer 208 sets the optical information acquisition wavelength associated with the type of the wavelength filter 201 based on the information about the type of the wavelength filter 201 acquired in step S201. Table 2 shows the optical information acquisition wavelengths associated with the types of wavelength filters. The types of wavelength filters include an infrared cut-off filter, an 850 nm band-pass filter, and a 940 nm band-pass filter. When the type of the wavelength filter 201 is an infrared cut-off filter, the optical information acquisition wavelength is set to 600 nm. When the type is an 850 nm or 940 nm band-pass filter, the optical information acquisition wavelengths are set to 850 nm and 940 nm, respectively. Then, the process proceeds to step S204.

[0106] On the other hand, in step S203, the camera microcomputer 208 sets the optical information acquisition wavelength in the case where the wavelength filter 201 is not inserted. For example, as shown in Table 2, the optical information acquisition wavelength is set to 700 nm. Then, the process proceeds to step S204.

[0107] In step S204, the camera microcomputer 208 sends an optical information transmission request to the lens microcomputer 100, and the optical information transmission request includes the optical information acquisition wavelength set in step S202 or step S203. The lens microcomputer 110 that has received the optical information transmission request reads out the optical information corresponding to the optical information acquisition wavelength from the memory 112 and transmits the optical information to the camera microcomputer 208.

[0108] Next, in step S205, the camera microcomputer 208 receives the optical information transmitted from the lens microcomputer 110 and stores the optical information in the memory 210.

[0109] Thereafter, the camera microcomputer 208 uses the optical information stored in the memory 210 to control the driving of the zoom lens 102, the aperture stop 103, the image stabilization lens 104, the focusing lens 105, the floating lens, and the like.

[0110] This embodiment performs various controls to drive the focusing lens, the image stabilization lens, and the aperture stop using the optical information corresponding to the optical information acquisition wavelength automatically set according to the insertion / removal or type of the wavelength filter. Therefore, good optical performance can be obtained whether the wavelength filter is inserted or removed, or regardless of the type of the filter. As a result, a high-quality captured image can be obtained.

[0111] Example 3

[0112] Figure 5 The flowchart in shows the optical information acquisition process executed by the camera microcomputer 208 that automatically sets the optical information acquisition wavelength according to the main wavelength of light (ambient light) in the imaging environment. For example, in an imaging environment using an infrared projector, the camera microcomputer 208 sets the optical information according to the main wavelength of the infrared light as the ambient light. In this embodiment, different from Example 1 and Example 2, the insertion / removal and type of the wavelength filter 201 are not determined, but the optical information corresponding to the main wavelength of the ambient light received by the image sensor 202 according to the insertion / removal and type of the wavelength filter 201 is used.

[0113] In step S300, the camera microcomputer 208 obtains a YUV signal represented by a luminance signal Y and color difference signals UV from the RGB video signal generated by imaging, and estimates the type and color temperature of the ambient light based on the value obtained by accumulating the color difference signals UV. The camera microcomputer 208 also determines (estimates) the dominant wavelength of the ambient light based on the estimated color temperature.

[0114] Next, in step S301, the camera microcomputer 208 sends an optical information transmission request including information about the determined dominant wavelength to the lens microcomputer 100. The lens microcomputer 110 that has received the optical information transmission request reads out the optical information corresponding to the dominant wavelength from the memory 112 and transmits the optical information to the camera microcomputer 208.

[0115] Next, in step S302, the camera microcomputer 208 receives the optical information transmitted from the lens microcomputer 110 and stores the optical information in the memory 210.

[0116] Thereafter, the camera microcomputer 208 uses the optical information stored in the memory 210 to control the driving of the zoom lens 102, the aperture stop 103, the image stabilization lens 104, the focusing lens 105, the floating lens, etc.

[0117] This embodiment uses optical information corresponding to the dominant wavelength of the ambient light according to whether the wavelength filter 201 is inserted or removed and the type of the wavelength filter 201 to perform various controls for driving the focusing lens, the image stabilization lens, and the aperture stop. Therefore, good optical performance can be obtained regardless of whether the wavelength filter is inserted or removed, or regardless of the type of the filter. As a result, high-quality captured images can be obtained.

[0118] Other embodiments

[0119] The present invention can provide a program that implements one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and can be implemented by one or more processors configured to read and execute the program in a computer of the system or device. The present invention can also be implemented by a circuit (e.g., ASIC) that implements one or more functions.

[0120] The embodiments described above are merely representative examples, and various modifications and changes can be made to the embodiments when implementing the present invention.

Claims

1. An optical device, comprising: a processing component configured to perform imaging-related processing in a case where a wavelength filter can be inserted or removed, the wavelength filter being configured to control a wavelength of imaging light incident on an image sensor, the image sensor being configured to capture a subject image formed by an optical system; and an acquisition component configured to acquire optical information about the optical system for the processing, the optical information corresponding to the wavelength of the imaging light corresponding to at least one of insertion / removal and type of the wavelength filter.

2. The optical device according to claim 1, characterized in that, The acquisition component is configured to: enable a user to select a specific wavelength corresponding to at least one of insertion / removal and type of the wavelength filter, and acquire the optical information corresponding to the specific wavelength.

3. The optical device according to claim 2, characterized in that, The acquisition component is configured to display, to the user, wavelengths that the user can select as the specific wavelength according to at least one of insertion / removal and type of the wavelength filter.

4. The optical device according to any one of claims 1 to 3, characterized in that The acquisition component is configured to: set a specific wavelength corresponding to a determination result of at least one of insertion / removal and type of the wavelength filter, and acquire the optical information corresponding to the specific wavelength.

5. The optical device according to any one of claims 1 to 3, characterized in that, The acquisition component is configured to: determine a main wavelength of the imaging light corresponding to at least one of insertion / removal and type of the wavelength filter based on an output of the image sensor, and acquire the optical information corresponding to the main wavelength.

6. The optical device according to any one of claims 1 to 5, further comprising a focusing component configured to adjust an imaging position of the imaging optical system, It is characterized in that wherein the optical information is used to control driving of the focusing component.

7. The optical device according to any one of claims 1 to 5, further comprising an image stabilization component configured to correct image blur caused by movement applied to the imaging optical system, It is characterized in that wherein the optical information is used to control driving of the image stabilization component.

8. The optical device according to any one of claims 1 to 5, further comprising a diaphragm configured to adjust an amount of light incident on the image sensor, It is characterized in that wherein the optical information is used to control driving of the diaphragm.

9. The optical device according to any one of claims 1 to 8, characterized in that, The wavelength filter is an infrared cut-off filter.

10. The optical device according to any one of claims 1 to 8, characterized in that The wavelength filter is a band-pass filter.

11. The optical device according to any one of claims 1 to 10, characterized in that, The optical information includes at least one of information about focal length, information about F-number, information about imaging magnification, information about a position of a focusing lens relative to a subject distance, information about a change amount of an imaging position per unit movement amount of the focusing lens, information about a position of a floating lens configured to move as the focusing lens moves, information about an image shift amount on the image sensor per unit movement amount of an image stabilization lens, and information about a front principal point position.

12. The optical device according to any one of claims 1 to 11, characterized in that, The optical device is an imaging device, the imaging device includes the image sensor, and the imaging device can be attached to a lens device including the optical system and can be detached from the lens device.

13. The optical device according to any one of claims 1 to 11, characterized in that, The optical device is a lens device, the lens device includes the optical system, and the lens device can be attached to an imaging device including the image sensor and can be detached from the imaging device.

14. The optical device according to any one of claims 1 to 13, characterized in that, The processing component is configured to control the optical system as the processing.

15. A control method for an optical device, the control method comprising the following steps: Performing imaging-related processing in a case where a wavelength filter can be inserted or removed, the wavelength filter being configured to control the wavelength of imaging light incident on the image sensor, the image sensor being configured to capture a subject image formed by the optical system; And Obtaining optical information about the optical system for the processing, the optical information corresponding to the wavelength of the imaging light corresponding to at least one of insertion / removal and type of the wavelength filter.

16. A program that causes a computer to execute the processing of the control method according to claim 15.

Images