WO2005098500A1 - 合焦情報取得用検出装置及びそれを用いた撮像装置 - Google Patents
合焦情報取得用検出装置及びそれを用いた撮像装置 Download PDFInfo
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- WO2005098500A1 WO2005098500A1 PCT/JP2005/004999 JP2005004999W WO2005098500A1 WO 2005098500 A1 WO2005098500 A1 WO 2005098500A1 JP 2005004999 W JP2005004999 W JP 2005004999W WO 2005098500 A1 WO2005098500 A1 WO 2005098500A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
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- the present invention relates to a focus information acquisition detecting device that forms an image of a subject via an optical element, and acquires focus information from a plurality of pieces of luminance information obtained in different blur states, and such focus information.
- the present invention relates to an imaging device using an acquisition detection device.
- Japanese Patent Publication No. 3-52607 discloses that an object image is projected onto a pair of light receiving elements arranged with a predetermined optical path difference before and after a plane to be focused, and obtained image information is obtained.
- a method of detecting a focused state of an object based on a predetermined evaluation function As a basic method of using this method, there is a camera equipped with a focus determination device. In this method, a so-called front focus and a rear focus are determined by obtaining object information on two surfaces separated by the same distance with respect to a plane to be focused. The result of the judgment is useful for driving, for example, a focusing lens of the focusing optical system in a correct adjustment direction.
- USP 4,965,840 image information is obtained at two locations having different optical path lengths in order to calculate a spread parameter by performing arithmetic processing on a plurality of images having different blur states and determine focus.
- the spread parameter is a representative value indicating the blur state of the image information, which is related to the point spread function of the optical system, and the point on the image plane passes through a number of paths of the optical system.
- the variance in the case where the image is formed as a region instead of as a region is represented as follows.
- the present invention has been made in view of the above points, and it is easy to obtain a true value of a spread parameter, and it is a fast and inexpensive focus information acquisition detection device, and an imaging device using the same.
- the purpose is to provide.
- light that has passed through at least a part of an optical system that forms light from a target object on a plane to be focused at a predetermined position is transmitted to the plane to be focused by the optical system.
- Light-guiding means for guiding light so as to form an image on an equivalently-focused surface which is substantially equivalent to the light, and at least two of a plurality of images having different blurs formed by the light guided by the light-guiding means.
- Brightness information obtaining means for obtaining brightness information of mutually corresponding regions in the image, wherein the optical information is obtained on the same optical axis defined in the optical system with the object as a base point.
- an optical system for forming an image of light having an object power on the surface to be focused such as the focus information acquiring detection device according to one aspect of the present invention
- an imaging device including: a focus information acquisition detection device; and an imaging device arranged on the surface to be focused.
- FIG. 1 is a schematic diagram showing a configuration of a single-lens reflex digital camera as an imaging device using a focus information acquiring detection device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of a focus information acquiring detection device according to a first embodiment.
- FIG. 3 is a diagram showing schematic steps of a focus determination method for calculating a spread parameter and determining focus.
- FIG. 4 illustrates a positional relationship between a focusing lens and an imaging position, and two focus determination image luminance information and two captured images for the same portion P of the same subject based on the positional relationship.
- FIG. 5A is a conceptual diagram illustrating a relationship between a focusing point when a focusing lens is at a first position and a spread parameter calculated by a focusing determination method disclosed in USP 4,965,840. It is.
- FIG. 5B illustrates the relationship between the focusing point when the focusing lens is at the second position and the spread parameter calculated by the focusing determination method disclosed in USP 4,965,840.
- FIG. 5B illustrates the relationship between the focusing point when the focusing lens is at the second position and the spread parameter calculated by the focusing determination method disclosed in USP 4,965,840.
- FIG. 5C is a conceptual diagram illustrating the relationship between the focusing point when the focusing lens is at the third position and the spread parameter calculated by the focusing determination method disclosed in USP 4,965,840. It is.
- FIG. 5D is a conceptual diagram illustrating a change in a spread parameter value calculated by the focus determination method disclosed in US Pat. No. 4,965,840.
- FIG. 6A is a diagram showing an example in which the first and second luminance information acquisition sensors are arranged on the optical path on the optical path on the non-subject side with respect to the plane to be equivalently focused.
- FIG. 3 is a conceptual diagram illustrating a relationship between a focus point when the object is closer to a subject than a fixed surface and spread parameters calculated in the first embodiment.
- FIG. 6B is a diagram illustrating an example in which the first and second brightness information acquisition sensors are arranged on the optical path on the optical path closer to the non-subject side than the equivalent focusing target plane.
- FIG. 3 is a conceptual diagram illustrating a relationship between a focus point when the image is on a fixed surface and a spread parameter calculated in the first embodiment.
- FIG. 6C is a diagram illustrating an example in which the first and second luminance information acquisition sensors are arranged on the optical path on the optical path closer to the non-subject side than the plane to be equivalently focused.
- FIG. 4 is a conceptual diagram illustrating a relationship between a focus point when the object is on a non-subject side from a fixed surface and a spread parameter calculated in the first embodiment.
- FIG. 6D is calculated in the first embodiment when the first and second luminance information acquisition sensors are arranged on the optical path on the non-subject side from the equivalent focusing expected plane in the first embodiment. It is a conceptual diagram explaining the change of a spread parameter value.
- FIG. 7A is a diagram illustrating a focus point when the first and second luminance information acquisition sensors are arranged on the optical path on the optical path closer to the subject than the equivalent focusing planned surface in the first embodiment.
- FIG. 3 is a conceptual diagram illustrating a relationship between a focus point when the subject is closer to the non-subject side and spread parameters calculated in the first embodiment.
- FIG. 7B is a diagram illustrating a focus point when the first and second luminance information acquisition sensors are arranged on the optical path closer to the subject than the equivalent focusing plane in the first embodiment.
- FIG. 4 is a conceptual diagram illustrating a relationship with the data.
- FIG. 7C is a view showing an example in which the first and second luminance information acquisition sensors are arranged on the optical path closer to the subject than the equivalent focusing plane in the first embodiment.
- FIG. 4 is a conceptual diagram illustrating the relationship between the focus point when the subject is further on the subject side and spread parameters calculated in the first embodiment.
- FIG. 7D is a view showing a spray calculated in the first embodiment when the first and second luminance information acquisition sensors are arranged on the optical path on the side closer to the subject than the plane to be equivalently focused.
- FIG. 5 is a conceptual diagram illustrating a change in a read parameter value.
- FIG. 8 is a diagram showing a configuration of a focus information acquiring detection device according to a first embodiment when the system shown in FIGS. 7A to 7D is actually applied to a camera.
- FIG. 9 is a diagram showing a configuration of a first modification of the focus information acquiring detection device according to the first embodiment.
- FIG. 10 is a diagram showing a configuration of a focus information acquiring detection device according to a second embodiment of the present invention.
- FIG. 11A is a diagram showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when a focusing lens is at a first position.
- FIG. 11B is a view showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when the focusing lens is at a second position.
- FIG. 11C is a diagram showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when the focusing lens is at a third position.
- FIG. 12A is a diagram showing a relationship between an equivalent focusing expected plane and a first luminance information acquisition sensor when a focusing lens is at a first position.
- FIG. 12B is a diagram showing the relationship between the equivalent focusing expected plane and the first luminance information acquisition sensor when the focusing lens is at the fourth position.
- FIG. 12C is a diagram showing a relationship between the equivalent focusing expected plane and the first luminance information acquisition sensor when the focusing lens is at the fifth position.
- FIG. 13 is a diagram showing a configuration of a focus information acquiring detection device according to a third embodiment of the present invention.
- FIG. 14 is a diagram showing a configuration of a focus information acquiring detection device according to a fourth embodiment of the present invention.
- FIG. 15 is a diagram showing an optical configuration for describing a focus information acquisition configuration system of a general phase difference detection method.
- FIG. 16 is a diagram showing a configuration of a first modification of the focus information acquiring detection device according to the fourth embodiment.
- FIG. 17 is a diagram showing a configuration of a focus information acquiring detection device according to a fifth embodiment of the present invention.
- FIG. 18A is a diagram showing the relationship between the image sensor and the plane to be focused when the image sensor is at the first position.
- FIG. 18B is a diagram showing a relationship between the image sensor and the plane to be focused when the image sensor is at the second position.
- FIG. 18C is a diagram showing a relationship between the image sensor and the plane to be focused when the image sensor is at the third position.
- FIG. 19A is a diagram showing a relationship between an image sensor and a plane to be focused when the image sensor is at a first position.
- FIG. 19B is a diagram showing a relationship between the image sensor and the plane to be focused when the image sensor is at the fourth position.
- FIG. 19C is a diagram showing the relationship between the image sensor and the plane to be focused when the image sensor is at the fifth position.
- the term "planned focusing plane” is used to determine the position of the light receiving surface of the image pickup device from the reference position on the image pickup device when the image pickup device is constructed. Is also assumed to be located at a predetermined position from the imaging device reference point. In consideration of the optical characteristics including various aberrations of the imaging optical system, and errors in manufacturing and assembly, the “planned in-focus position” is perpendicular to the optical axis set in the optical system with a width within the existing range. Surface Is determined.
- the “equivalent focusing surface” is an optically equivalent position to such a focusing surface, and takes into account optical characteristics including aberrations of all optical elements interposed in the middle, manufacturing and assembly errors.
- the optical axis is determined to be a plane perpendicular to the optical axis equivalent to the optical axis that can also be predetermined with respect to the plane to be focused, at an optically equidistant position corresponding to the existence range of the plane to be focused.
- the "luminance information" indicates the obtained sensor signal information itself.
- signal information for each color band obtained by each color filter for example, signal information for each of R, G, and B may be used! It may be single signal information obtained by combining.
- the signal information itself is also area-type sensor force.General image information that has acquired two-dimensional arrangement, one-dimensional rearrangement of this two-dimensional image information, and line-type sensor force There is no restriction on the format of the signal information, such as the acquired one-dimensional thing, the image sensor itself is one segment and the information of one point.
- a single-lens reflex digital camera as an imaging device using a focus information acquisition detection device has an interchangeable lens 12 detachably attached to a camera body 10.
- the interchangeable lens 12 includes a plurality of lenses, a lens group, a diaphragm, a lens barrel, and the like, and is capable of adjusting a focal length, a focusing lens position, a light amount, and the like.
- such a configuration of the interchangeable lens 12 is represented by only the focusing lens 14 for simplicity, and other illustrations are omitted.
- a part of the quick return mirror 18 is a transmission mirror.
- Part of the subject light that passes through is reflected by the total reflection type sub-mirror 24 and enters the transmission type mirror 26.
- the light beam transmitted through the transmission mirror 26 is imaged on the first luminance information acquisition sensor 30 via the first equivalent focusing surface 28-1.
- the light beam reflected by the transmission mirror 26 passes through the second equivalent in-focus plane 28-2, and acquires the second luminance information arranged on the optical path from the non-subject side to the equivalent in-focus plane. It is imaged on the sensor 32 for use. Then, based on the sensor information acquired by these sensors 30 and 32, an appropriate operation is performed by an operation unit (not shown) to move the focusing lens position of the focusing lens 14 to the in-focus position. Is generated.
- At least two pieces of focus determination image luminance information 100 of the same part P of the same subject are captured by an imaging pattern that affects the blurred state of the captured image 102. Obtained by changing at least one parameter.
- the photographing parameters include a focusing lens position, an aperture amount, a focal length, and the like.
- the description will be limited to a case where only the optical path length between the plane to be focused and the object is changed.
- the focusing lens 14 is moved to prescribed first and second locations in order to change the optical path length between the plane to be focused and the subject (step).
- S10A, step S10B and obtain the first and second image luminance information, respectively (step S12A, step S12B).
- Each of the acquired images is subjected to normalization processing such as image magnification and luminance distribution (steps S14A and S14B), and if necessary, selects an area in the acquired image information for which focus determination is to be performed (step S14A).
- S16A, step S16B The selection is made for one of the image information, and the corresponding area is selected for the other image information.
- a preprocessing operation such as smoothing for calculating a spread parameter is performed on the focus determination area of the selected first and second image information (steps S18A and S18B).
- the spread parameter of the captured image in the present method is calculated by integrating the two preprocessing calculation results (step S20).
- Spread parameters obtained corresponding to the first and second image information are ⁇ 1 and ⁇ 2, respectively.
- a database corresponding to one of these spread parameters ⁇ 1 and ⁇ 2 and a focusing lens position from which the focusing state should be obtained for the spread parameter is obtained in advance. Therefore, if the obtained spread parameters are referred to in this correspondence database, a movement command value of the focus cinder lens driving actuator which is not shown to obtain the in-focus state is generated (step S22).
- FIGS. 5A to 5D are conceptual diagrams illustrating the focus point P ′ and spread parameters ⁇ 1 and ⁇ 2 calculated by the focus determination method disclosed in US Pat. Nos. 4,965,840. It should be noted that reference numerals are common to FIGS. 5A to 5C, and therefore, are attached only to FIG. 5A to 5C and FIG. 5D have the same position in the horizontal axis direction, and the vertical axis direction in FIG. 5D shows an outline of the calculated spread parameter value.
- the focusing state on the equivalent focusing surface 28 is the force obtained in FIG. 5 ⁇ . Both ⁇ 1 and ⁇ 2 before and after this change from increasing calorie to decreasing or decreasing to increasing. This is because the spread parameter calculated as a value representing blur is basically a positive value. However, in this state, correct values of ⁇ 1 and ⁇ 2 cannot be obtained, and the movement command value of the focusing lens 14 cannot be uniquely associated from the database! Therefore, in USP 4,965,840, the true value of the spread parameter is determined by comparing the contrast of ⁇ 1, ⁇ 2 or the contrast of the first and second image luminance information, and uniquely determine ⁇ 1, ⁇ 2. 2 had been decided.
- the first and second luminance information acquiring sensors 30 and 32 are arranged on the optical path on the non-subject side from the plane to be equivalently focused. Are placed.
- FIGS. 6A to 6C virtually remove the optical path bending in the transmission mirror 32 of FIG.
- FIG. 3 is a diagram illustrating a first luminance information acquiring sensor 30, a second luminance information acquiring sensor 32, and an equivalent in-focus plane 28 on a straight line.
- Spread parameters obtained corresponding to the first luminance information acquisition sensor 30 and the second luminance information acquisition sensor 32 are ⁇ 1 and ⁇ 2, respectively.
- FIGS. 6A to 6D are conceptual diagrams illustrating the focus point P ′ and the spread parameters ⁇ 1 and ⁇ 2 calculated by the present method in association with each other, similarly to FIGS. 5A to 5D.
- the reference numbers are common to FIGS. 6A to 6C, and therefore are attached only to FIG. 6A for simplification of the drawing. 6D are the same in the horizontal direction in FIG. 6D and FIG. 6D, and the vertical direction in FIG. 6D shows an outline of the calculated spread parameter value.
- the focused state on the equivalent focusing expected plane 28 is obtained in FIG.
- the equivalent focusing expected plane 28 and the luminance information acquisition sensors 30 and 32 are arranged in this order on the side closest to the subject side.
- the difference between FIG. 5D and FIG. 6D is the area between the equivalent focusing expected surface 28 and the first luminance information acquisition sensor 30 marked with an arrow in FIG. 6D.
- Both ⁇ 1 and ⁇ 2 decrease monotonically as long as the focus point P ′ moves toward the back focus with respect to the predetermined plane 28.
- the focusing point P ′ moves back and forth as a servo adjustment characteristic before and after the equivalent focusing surface 28 by the adjustment driving of the focusing lens 14. Even if the in-focus point P 'passes through the equivalent in-focus expected plane 28 from the rear focus side, the spread parameter is monotonically decreasing until the position of the first luminance information acquisition sensor 30, so the calculation processing is true.
- the drive control of the focusing lens 14 can be stably performed without switching the processing for determining the value.
- This tendency of monotonous decrease has the property of having both the spread parameters ⁇ 1 and ⁇ 2, so that the spread parameters ⁇ 1 and ⁇ 2 can be appropriately selected and used according to the purpose and necessity.
- a stepping motor is often used for driving a lens.
- stepping motors return the motor to the initial position as necessary to eliminate the adverse effects such as the effects of knock lash and errors in the motor step position due to step-out. If the initial position of the focusing lens 14 is on the rear focus side as shown in Fig. 6 ⁇ , the spread parameter calculation for focusing from that point is always monotonically reduced. It is easy to adapt to the system sequence because it can be performed by using the low tendency part.
- FIG. 1 shows an example in which the system shown in FIGS. 6A to 6D is actually applied to a camera.
- FIGS. 7A to 7D are also similar to FIGS. 6A to 6D.
- the monotonically decreasing spread parameter of the back focus side is described.
- the brightness information acquisition sensors 30, 32, and the equivalent focusing expected plane 28 are arranged in that order on the side, and the front pin On the side, the monotonicity of the spread parameter becomes available. Therefore, as described above, if the initial position return of the focus cinder lens 14 is on the front focus side as shown in FIG. 7A, the spread parameter calculation for focus determination from that point always increases monotonically. Since the drive control of the focusing lens 14 for focusing can be performed using the tendency part, it is easy to adapt to the system sequence.
- FIG. 8 shows an example in which the system shown in FIGS. 7A to 7D is actually applied to a camera.
- the transmittance may be any value such as 33% or 66% depending on the algorithm or processing. Good transmittance. No restrictions are placed on the transmittance.
- the reflection optical system is provided on the optical path for acquiring the focus information
- an arbitrary optical element such as a concave lens, a convex lens, and an ND filter may be interposed.
- the luminance information acquisition sensors 30, 32 may be in various forms, for example, an area type CCD of about 640 x 480 pixels or an area readable CMOS sensor, or a dedicated sensor in which a plurality of line sensors are arranged in an island shape. Is possible. Further, color, black and white, infrared wavelengths, and ultraviolet wavelengths may be used. No restrictions are placed on the type of sensor. In the case of a monochrome sensor, the acquired sensor information is used directly as luminance information. In the case of a color sensor, for example, of the R, G, and B luminance information, only the G component is used. Brightness information may be used, or brightness information may be obtained by combining R, G, and B at a fixed ratio.
- the luminance information acquisition sensors 30, 32 are respectively inclined with respect to the respective equivalent in-focus scheduled surfaces 28-1 and 28-2 in such a manner that the normal direction set on each surface is oblique. To be It is desirable to arrange them so that they face in the same direction from the viewpoint of uniform light reception.
- the inclinations of the equivalent focusing expected surfaces 28-1 and 28-2 can be adjusted according to the sensor arrangement space. If the equivalent focal planes 28-1 and 28-2 are designed to be perpendicular to each other, the positional relationship between the luminance information acquisition sensors 30 and 32 is determined easily and with high accuracy and further easy to assemble. Is feasible.
- the spread parameter is monotonically increased or decreased in the normal driving range of the focusing lens, and the true value of the spread parameter is decreased. It is not necessary to add extra judgment processing to the judgment, and the calculation cost is reduced and the calculation processing speed is improved.
- the reference force can also set a monotonically decreasing spread parameter curve to match the system sequence.
- luminance information of a plurality of images having different blurs can be easily acquired due to different optical path lengths.
- only one second brightness information acquisition sensor 32 is provided.
- the number of the second brightness information acquisition sensor 32 may be two or more.
- a part of the light transmitted through the transmission mirror 32 through the sub-mirror 24 passes through the first equivalent focusing surface 28-1, and the first luminance information acquisition sensor 30 It is imaged in.
- the subject side force on the optical path is also directed backward from the second equivalent in-focus target plane 28-2.
- a transmission type mirror 34 is arranged, and among the light reflected by the transmission type mirror 32, the light transmitted by the transmission type mirror 34 is received by one second luminance information acquisition sensor 32-1.
- the other second brightness information acquisition sensor 32-2 is arranged at an optical path length position different from that of the one second brightness information acquisition sensor 32-1 so that the light reflected by the transmission mirror 34 is reflected.
- the other second luminance information acquisition sensor 32-2 receives light.
- the brightness information acquisition sensors 30, 32-1 and 32-2 are all arranged on the optical path on the non-subject side with respect to the equivalent focusing expected planes 28-1, 28-2. However, depending on the design, it is possible to lay out all of the equivalent focusing surfaces 28-1 and 28-2 on the optical path on the subject side.
- a plurality of transmission mirrors may be installed with the same idea.
- the position of the focusing lens 14 can be determined. For example, when the luminance information difference is large, a small combination can be selected, and when the luminance information difference is small, a large combination can be selected. Therefore, even in the case where the spread parameter cannot be calculated well in the past, robust focus determination can be performed.
- the spread parameter can be monotonously adjusted. It goes without saying that it has decreasing and monotonically increasing characteristics!
- the focusing lens 14 is moved back and forth to change the optical path length in order to obtain a plurality of pieces of image luminance information having different blur states.
- the focusing information can be acquired by installing one sensor specially developed for acquiring the focusing information, which is useful for space saving at low cost.
- a light transmitting mirror is used as the sub mirror 24 ′ used in the present configuration.
- the light beam reflected by the submirror 24 ' is guided to a second luminance information acquisition sensor 32 installed on the subject side with respect to the equivalent focusing surface 28 on the optical path. Further, the light beam transmitted through the submirror 24 'is guided to the first image sensor 16 which also serves as a luminance information acquisition sensor.
- the second luminance information acquisition sensor 32 and the imaging sensor 16 can acquire luminance information having different blur states at the same time, and the addition of one luminance information acquisition sensor to the camera can be performed. It becomes possible to acquire focus information.
- the second brightness information acquisition sensor 32 is disposed on the subject side with respect to the equivalent focusing expected plane 28.
- the focusing lens 14 is moved back and forth along the optical axis of the allowable range, and consequently, both the second luminance information acquisition sensor 32 and the imaging sensor 16 acquire luminance information on the subject side with respect to the equivalent focusing target plane 28.
- the image sensor 16 will be conversely positioned on the non-subject side with respect to the equivalent focusing plane. Try to get the luminance information.
- a shutter (not shown) needs to be opened at least for an imaging area during acquisition of luminance information by the imaging sensor 16.
- the second luminance information acquisition sensor 32 moves the equivalent focusing expected plane 28 along the optical path. It may be installed on the non-subject side.
- the focus information acquiring detection device since the imaging element of the imaging device is used, it is not necessary to separately provide a focus determination image acquisition sensor. Space saving and low cost can be realized. In addition, since the focus is determined just at the position where the image is taken, the accuracy is high and the focused state is obtained.
- the focus information acquiring detection device includes a focus sensor optical system 36 and a focus sensor 38. And usually, they are used to determine the focus of the conventional phase difference detection method! / Puru.
- the focus determination of the conventional phase difference detection method is disclosed in the above-mentioned Japanese Patent Publication No. 3-52607. That is, as shown in FIG. 15, the light beam emitted from the subject passes through the focusing lens 14, the equivalent focusing surface 28, the condenser lens 36 A, the pupil dividing lenses 36 B, 36 C arranged with parallax, An image is finally formed on a focus sensor 38 which also has a force such as a plurality of line CCDs via a focus sensor optical system 36 which also has a force such as a field mask (not shown).
- the expected value of the phase difference information at the time of focusing of the subject image signal obtained by the focusing sensor 38 via the pupil dividing lenses 36B and 36C, and the phase difference information actually acquired The movement command value of the focusing lens 14 until the image picked up by the image sensor 16 is brought into the focused state is calculated from the difference.
- the focus information is acquired as in the third embodiment by switching the mode. . That is, the quick return mirror 18 is flipped up and the position of the focusing lens 14 is moved back and forth in parallel with the optical axis, so that the image sensor 16 acquires luminance information in different blur states. As a result, the initial position of the imaging sensor 16, which is the plane to be focused, moves back and forth to the subject side and the non-subject side along the optical path with respect to the imaging sensor 16.
- the method of moving the focusing lens 14 back and forth and acquiring the monotonically increasing or decreasing spread parameter with the image sensor 16 is the same as in the third embodiment.
- a fixed light-transmissive fixed mirror 18 ' may be used instead of the quick return mirror 18 as shown in FIG.
- the imaging sensor 16 itself in parallel with the imaging surface for the camera shake prevention function.
- the degree of freedom to move in the direction parallel to the optical axis of the image sensor 16 is provided.
- an electrostatic actuated actuator disclosed in JP-A-2001-9796 and JP-A-2001-9797 is used. can do. That is, if a large number of such electrostatic actuators are arranged on the surface and the imaging sensor 16 is supported, the imaging sensor 16 is moved substantially horizontally in the plane from the initial position plane of the imaging sensor 16 and is moved relative to the plane. It is also possible to move back and forth in the vertical direction
- the imaging sensor 16 is moved toward the subject as shown in FIGS. 18A to 18C with respect to the equivalent in-focus expected plane and the expected in-focus plane which are the initial positions of the imaging sensor 16, and As shown in FIGS. 19A to 19C, it is possible to move to the non-subject side.
- the imaging sensor 16 By moving the imaging sensor 16 along the optical axis with respect to the plane to be equivalently focused, it is possible to acquire multiple pieces of luminance information only on the subject side or acquire multiple pieces of luminance information only on the non-subject side. It goes without saying that a monotonically increasing or monotonically decreasing spread parameter can be obtained. [0066] According to the focus information acquisition detection device according to the present embodiment, a plurality of pieces of luminance information having different blur states can be acquired without disposing a plurality of sensors, and the device can be reduced in cost and size. become.
- the first brightness information acquisition sensor 30 in FIG. 10 uses the same concept as the force for acquiring the brightness information having different blur states by moving the imaging sensor 16. By providing a cutuator, it is possible to realize the same function by moving back and forth along the optical path.
- the moving sensor is not limited.
- the present invention is not limited to the application to the digital single-lens reflex camera as described in the above embodiments, a non-digital camera, a compact digital camera without an interchangeable lens, a quick return mirror, etc., a microscope It can be diverted to a focus information acquisition detection device of any type of imaging device such as an endoscope and a telescope.
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JP2002296493A (ja) * | 2001-03-30 | 2002-10-09 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
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JPH10122813A (ja) * | 1996-10-23 | 1998-05-15 | Ricoh Co Ltd | 光学式変位センサ |
JP2002296493A (ja) * | 2001-03-30 | 2002-10-09 | Fuji Photo Optical Co Ltd | ピント状態検出装置 |
JP2003174413A (ja) * | 2001-12-05 | 2003-06-20 | Mitsubishi Electric Corp | レベル調整波長多重光伝送装置 |
JP2003279846A (ja) * | 2002-03-25 | 2003-10-02 | Fuji Photo Optical Co Ltd | 撮影レンズのピント状態検出装置 |
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