JP6706750B2 - Optical system driving device, lens barrel, and optical device - Google Patents

Description

The present disclosure relates to an optical system driving device for moving a movable body that is movable in at least three degrees of freedom, and a lens barrel and an optical device including the optical system driving device.

Patent Document 1 discloses a technique capable of automatically performing alignment adjustment including optical axis alignment adjustment and cat's eye adjustment by acquiring an interference fringe image by an image pickup element provided in an interferometer. ..

JP, 2009-2673, A

The present disclosure provides an optical system driving device, a lens barrel, and an optical device capable of detecting the position of a movable body that is movable in at least three degrees of freedom in each degree of freedom and capable of highly accurate position adjustment.

The optical system driving device according to the present disclosure includes a movable body that is movable in at least three degrees of freedom, and a light transmission unit that is provided integrally with the movable body and that moves with the movable body. Further, a driving unit that moves the moving body for each of at least three degrees of freedom and a detection unit that detects the position of each moving body having at least three degrees of freedom are provided. The detection unit includes a light emitting unit that emits light toward the light transmitting unit, and a light detector that receives light emitted from the light emitting unit and passes through the light transmitting unit and outputs a light reception signal based on the received light. Have and. In addition, the detection unit has at least three degrees of freedom on the basis of the position of the spot received by the photodetector and the change of the spot shape with respect to the spot shape when the light transmission unit is at the reference position. Detect the position of.

The optical system driving device according to the present disclosure is effective for detecting the position in each degree of freedom of a movable body that is movable in at least three degrees of freedom and performing highly accurate position adjustment.

Explanatory drawing which shows typically the schematic structure of the digital camera illustrated as an optical device which concerns on Embodiment 1. FIG. 1 is a perspective view of an optical system driving device according to a first embodiment. Front view of the optical system driving device according to the first embodiment Side view of the optical system driving device according to the first embodiment Rear view of the optical system driving device according to the first embodiment The side view which shows schematic structure of the magnet unit, 1st coil, and 2nd coil of the optical system drive which concerns on Embodiment 1. FIG. 3 is a perspective view showing a light transmitting portion attached to each piece of the optical system driving device according to the first embodiment. FIG. 3 is a perspective view showing a fourth piece portion and a regulating portion of the optical system driving device according to the first embodiment. The front view which shows the 4th piece part and regulation part of the optical system drive device which concerns on Embodiment 1. The front view which shows typically the example of arrangement|positioning of each photodetector of the optical system drive device which concerns on Embodiment 1. By moving the first light transmitting portion of the optical system driving device according to the first embodiment to the Z axis direction negative side, how the spot of the light transmitted through the first light transmitting portion is on the light receiving surface of the photodetector. Explanatory drawing showing whether it has changed By moving the first light transmitting part of the optical system driving device according to the first embodiment to the reference position in the Z-axis direction, how the spot of the light transmitted through the first light transmitting part is on the light receiving surface of the photodetector. Explanatory diagram showing whether it has changed to By moving the first light transmitting section of the optical system driving device according to the first embodiment to the Z axis direction positive side, how the spot of the light transmitted through the first light transmitting section is on the light receiving surface of the photodetector. Explanatory diagram showing whether it has changed 6 is a flowchart showing the flow of shooting processing executed by the control unit of the digital camera according to the first embodiment. 4 is a flowchart showing the flow of attitude control processing executed by the lens controller of the optical system driving device according to the first embodiment. FIG. 3 is a perspective view of the optical system driving device according to the second embodiment. FIG. 3 is a perspective view showing a light transmitting portion attached to each piece of the optical system driving device according to the second embodiment. The front view which shows typically the example of arrangement|positioning of each photodetector of the optical system drive which concerns on Embodiment 2. FIG. 3 is a perspective view of an optical system driving device according to a third embodiment. Sectional drawing which looked at the lens holding|maintenance part from the 17-17 cutting line in FIG. The front view which shows typically the example of arrangement|positioning of each photodetector of the optical system drive device which concerns on Embodiment 3. 9 is a graph showing a difference between a light reception signal of the third photodetector and a light reception signal of the fourth photodetector, depending on the attitude of the lens holding portion of the optical system driving device according to the third embodiment. A perspective view of an optical system driving device according to a fourth embodiment. Description of how the spot of the light transmitted through the light transmitting portion changes on the light receiving surface of the photodetector when the lens holding portion of the optical system driving device according to the fourth embodiment has not moved from the reference position. Figure When the lens holding part of the optical system driving device according to the fourth embodiment moves to the positive side in the X-axis direction, it shows how the spot of the light transmitted through the light transmitting part changes on the light receiving surface of the photodetector. Illustration When the lens holding part of the optical system driving device according to the fourth embodiment moves to the Y axis direction positive side, it shows how the spot of the light transmitted through the light transmitting part changes on the light receiving surface of the photodetector. Illustration When the lens holding part of the optical system driving device according to the fourth embodiment moves to the Z axis direction positive side, how the spot of the light transmitted through the light transmitting part changes on the light receiving surface of the photodetector is shown. Illustration When the lens holding portion of the optical system driving device according to the fourth embodiment moves to the negative side in the Z-axis direction, it shows how the spot of the light transmitted through the light transmitting portion changes on the light receiving surface of the photodetector. Illustration Explanatory drawing showing how the spot of the light transmitted through the light transmitting part changes on the light receiving surface of the photodetector when the lens holding part of the optical system driving device according to the fourth embodiment rotates around the X axis. Explanatory drawing showing how the spot of the light transmitted through the light transmitting part changes on the light receiving surface of the photodetector when the lens holding part of the optical system driving device according to the fourth embodiment rotates around the Y axis.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters or duplicate description of substantially the same configuration may be omitted. This is to prevent the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims by these.

(Embodiment 1)
The first embodiment will be described below with reference to FIGS. 1 to 13.

[1-1. Constitution]
[1-1-1. Optical device]
FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a digital camera exemplified as the optical device according to the first embodiment. As shown in FIG. 1, the digital camera 1 includes a camera body 2 and a lens barrel 3.

Here, as shown in FIG. 1, in the present embodiment, a three-dimensional orthogonal coordinate system is set. The Z-axis direction coincides with the optical axis 5 of the optical system 4 described later. Here, the positive side in the Z-axis direction means the subject side in the optical axis direction, and the opposite side is the negative side. The X-axis direction coincides with the width direction of the digital camera 1 in the plane orthogonal to the optical axis 5. The Y-axis direction coincides with the height direction of the digital camera 1 in the plane orthogonal to the optical axis 5.

The lens barrel 3 includes an optical system 4, a zoom drive unit 31, a focus drive unit 32, a zoom encoder 33, a focus encoder 34, and an optical system drive device 100.

The optical system 4 includes a first lens group 41, a second lens group 42, and a third lens group 43.

The first lens group 41 changes the zoom magnification by moving along the optical axis 5. The second lens group 42 corrects the aberration of the optical system 4 by controlling the attitude with respect to the optical axis 5. The third lens group 43 adjusts the focus state of the subject image along the optical axis 5.

The zoom drive unit 31 may be, for example, a stepping motor that moves the first lens group 41 along the optical axis 5.

The focus drive unit 32 is, for example, a stepping motor that moves the third lens group 43 along the optical axis 5.

The zoom encoder 33 detects the zoom position (variable magnification position) of the first lens group 41 and outputs it to the control unit 22 (described later) of the camera body 2.

The focus encoder 34 detects the in-focus position of the third lens group 43 and outputs it to the control unit 22 of the camera body 2.

The optical system driving device 100 controls the attitude of the second lens group 42 with respect to the optical axis 5. The optical system driving device 100 includes a support mechanism 110 (see FIG. 2 ), an aberration correction driving unit 120, a light emitting unit 131, a photodetector 132, and a lens control unit 36.

The aberration correction drive section 120 moves the second lens group 42 with respect to the optical axis 5.

The light emitting unit 131 and the photodetector 132 detect the position of the second lens group 42.

The lens control unit 36 is a control device that controls the center of the lens barrel 3. The lens control unit 36 is connected to each unit mounted on the lens barrel 3 and performs various sequence controls of the lens barrel 3. The lens controller 36 includes a CPU (Central Processing Unit) including a control circuit, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The lens control unit 36 can realize various functions by the programs stored in the ROM being read by the CPU.

The support mechanism 110 movably supports the second lens group 42.

Details of the optical system driving device 100 will be described later.

The camera body 2 includes an image sensor 21 and a control unit 22.

The image sensor 21 is, for example, a CCD (Charge Coupled Device) that converts an optical image formed by the optical system 4 of the lens barrel 3 into an electrical signal. The image sensor 21 is drive-controlled by a timing signal. The image sensor 21 may be a CMOS (Complementary Metal Oxide Semiconductor) sensor.

The control unit 22 is a control device that controls the center of the camera body 2. The control unit 22 controls each unit of the digital camera 1 based on an operation signal from an operation unit such as a shutter button or a zoom lever. Specifically, the control unit 22 includes a CPU, ROM, RAM and the like. The control unit 22 can realize various functions by the programs stored in the ROM being read by the CPU. For example, when the zoom position is input from the zoom encoder 33 and the focus position is input from the focus encoder 34, the control unit 22 determines the position correction value of the second lens group 42 based on the zoom position and the focus position. Is calculated and the position correction value is output to the lens controller 36. The lens control unit 36 controls the aberration correction drive unit 120 based on the position correction value and the light reception signal output from the photodetector 132, thereby controlling the posture of the second lens group 42.

[1-1-2. Optical system drive]
Next, the optical system driving device 100 will be described.

FIG. 2 is a perspective view of the optical system driving device 100 according to the first embodiment. FIG. 3 is a front view of the optical system driving device 100 according to the first embodiment. FIG. 4 is a side view of the optical system driving device 100 according to the first embodiment. FIG. 5 is a rear view of the optical system driving device 100 according to the first embodiment.

As shown in FIGS. 2 to 5, the optical system driving device 100 includes a support mechanism 110, an aberration correction driving unit 120, a light emitting unit 131, and a photodetector 132.

The support mechanism 110 includes a lens holding unit 140, a light transmitting unit 150, and a restricting unit 160.

The lens holding unit 140 is an example of a moving body that can move in at least three degrees of freedom. Here, the degree of freedom is the degree to which one system can be displaced. In the case of the three-dimensional Cartesian coordinate system, the movement is made out of the six movement directions of the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, the rotation direction around the Y axis, and the rotation direction around the Z axis. Express the total number of possible directions as degrees of freedom. For example, when it is possible to move in only one moving direction, it is expressed as "1 degree of freedom", and when it is movable in two directions, it is expressed as 2 degrees of freedom.

The lens holding unit 140 holds the two lenses 42a and 42b of the second lens group 42. Although the case where the lens holding unit 140 holds the two lenses 42a and 42b is illustrated in the present embodiment, only one lens may be held or three or more lenses may be held.

The lens holding part 140 surrounds and holds the two lenses 42a and 42b arranged coaxially. A first piece portion 141 and a second piece portion 142, which protrude outward along the Y-axis direction, are provided at both ends of the lens holding section 140 in the Y-axis direction. In addition, a third piece portion 143 and a fourth piece portion 144 protruding outward along the X-axis direction are provided at both ends of the lens holding section 140 in the X-axis direction. The light transmitting portion 150 is attached to the first piece portion 141, the second piece portion 142, and the third piece portion 143.

Frames 145, 146, 147, 148 having a substantially rectangular shape in plan view are provided between the respective pieces 141, 142, 143, 144 around the lens holding part 140. The frame bodies 145, 146, 147, 148 hold the magnet unit 170, respectively. A first coil 181 for moving the lens holder 140 in the X-axis direction and the Y-axis direction is arranged on the positive side in the Z-axis direction of each magnet unit 170. A pair of second coils 182 for moving the lens holding unit 140 in the Z-axis direction is arranged on the Z-axis direction negative side of each magnet unit 170.

FIG. 6 is a side view showing a schematic configuration of the magnet unit 170, the first coil 181, and the second coil 182 of the optical system driving device 100 according to the first embodiment.

As shown in FIG. 6, the magnet unit 170 is composed of two plate magnets 171 and 172 having the same size and a rectangular shape in plan view. A pair of main surfaces of the plate magnets 171 and 172 facing each other in the Z-axis direction are exposed from the frame bodies 145, 146, 147, and 148 and are parallel to the planes orthogonal to the optical axes of the lenses 42a and 42b. ing. The plate magnets 171 and 172 are magnetized so that different magnetic poles are formed in the thickness direction. The plate-shaped magnets 171 and 172 are arranged adjacent to each other with their different magnetic poles facing upward (on the Z axis direction positive side). In the present embodiment, the magnet unit 170 exemplifies a case where two magnets of plate magnets 171 and 172 are used, but one plate magnet may be magnetized.

The first coil 181 is arranged so as to face the main surfaces of the plate magnets 171 and 172 on the Z axis direction positive side. The first coil 181 is wound in a substantially elliptical shape as a whole, and the major axis direction is along the longitudinal direction of the plate magnets 171 and 172. The first coil 181 is arranged so as to straddle the two plate magnets 171 and 172. Further, the pair of longitudinal portions of the first coil 181 facing each other are arranged so as to face the substantially central portions in the width direction of the plate magnets 171 and 172, respectively. For this reason, the magnetic field M1 perpendicular to the main surface of the plate-shaped magnets 171 and 172 on the Z axis direction positive side interlinks with the coil of the longitudinal direction portion of the first coil 181. Since the current generated by supplying power to the first coil 181 links with the magnetic field M1, thrust in the XY plane (thrust in the direction parallel to the XY plane) is generated. That is, by controlling the current of the first coil 181 to the magnet unit 170, the magnet unit 170 can be moved within the XY plane (in the direction parallel to the XY plane).

On the other hand, the pair of second coils 182 are arranged so as to face the main surfaces of the plate-shaped magnets 171 and 172 on the Z axis direction negative side. The second coil 182 is wound in a substantially elliptical shape as a whole, and the major axis direction is along the longitudinal direction of the plate magnets 171 and 172. The pair of second coils 182 are arranged so as to face the two plate-shaped magnets 171 and 172, respectively. Further, the longitudinal direction portions of the pair of second coils 182 are arranged so as to face both end portions in the width direction of the plate magnets 171 and 172. Therefore, the magnetic field M2 parallel to the main surface of the plate-shaped magnets 171 and 172 on the negative side in the Z-axis direction interlinks with the coil in the longitudinal direction of the second coil 182. The current generated by the power supply to the second coil 182 is linked to the magnetic field M2, so that a thrust force in the Z-axis direction is generated.

That is, by controlling the current of the pair of second coils 182 with respect to the magnet unit 170, the magnet unit 170 can be moved in the Z-axis direction.

By compositely controlling the currents of the first coils 181 and the pair of second coils 182 in all the magnet units 170, it is possible to control the attitude of the lens holding unit 140 with respect to the Z axis. Specifically, the lens holding unit 140 moves in 6 degrees of freedom in the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, the rotation direction around the Y axis, and the rotation direction around the Z axis. be able to.

The magnet unit 170, the first coil 181, and the second coil 182 form the aberration correction drive unit 120.

FIG. 7 is a perspective view showing the light transmitting portion 150 attached to each piece of the optical system driving device 100 according to the first embodiment. In FIG. 7, only the light transmitting portion 150 is shown. The light transmitting unit 150 is a light collector that collects light. For example, a cylindrical lens. In the present embodiment, a convex cylindrical lens will be described as an example. However, if the light is focused, it is also possible to use a concave cylindrical lens. The light transmission part (first light transmission part 150a) attached to the first piece part 141 has its axis 151 along the Y-axis direction, and the convex surface 152 faces the negative side in the Z-axis direction. The flat surface 153 of the first light transmitting portion 150a opposite to the convex surface 152 is parallel to the flat surface orthogonal to the optical axes of the lenses 42a and 42b. The same applies to the light transmitting portion (second light transmitting portion 150b) attached to the second piece portion 142.

The light transmission part (third light transmission part 150c) attached to the third piece part 143 has its axis 151 along the X-axis direction, and the convex surface 152 faces the Z axis direction negative side. A flat surface 153 of the third light transmitting portion 150c on the opposite side of the convex surface 152 is parallel to a flat surface orthogonal to the optical axes of the lenses 42a and 42b.

As shown in FIGS. 2 to 5, the fourth piece portion 144 projects from the peripheral edge portion of the lens holding portion 140 along the X-axis direction. The fourth piece portion 144 is engaged with the restriction portion 160 fixed to the lens barrel 3.

FIG. 8 is a perspective view showing the fourth piece portion 144 and the restriction portion 160 of the optical system driving device 100 according to the first embodiment. FIG. 9 is a front view showing the fourth piece portion 144 and the regulating portion 160 of the optical system driving device 100 according to the first embodiment.

The fourth piece portion 144 includes a main body portion 155, an arm portion 156, and a shaft portion 157.

The main body portion 155 projects from the end portion of the lens holding portion 140 along the X-axis direction. The arm portion 156 extends outward from the tip portion of the main body portion 155. The arm portion 156 is formed to have a smaller width in the Y-axis direction than the main body portion 155. The shaft portion 157 is a protrusion formed in a substantially spherical shape, and is provided at the tip of the arm portion 156. The diameter of the shaft portion 157 is wider than the width of the arm portion 156 in the Y-axis direction. Further, the center of the arm portion 156 in the Y-axis direction overlaps the center of the shaft portion 157. As a result, both ends of the shaft portion 157 in the Y-axis direction project from the arm portion 156 by the same width.

The restriction unit 160 restricts the movement of one of the movable degrees of freedom of the lens holding unit 140. Specifically, the restriction unit 160 restricts the movement of the lens holding unit 140 in the rotation direction around the Z axis. As a result, the lens holding unit 140 can move in five degrees of freedom.

The restricting portion 160 is fixed in the vicinity of the lens holding portion 140 and at a position facing the fourth piece portion 144. The restriction part 160 includes a base part 161 and a support part 162. The base 161 is erected from the support (not shown) in the lens barrel 3 along the Z-axis direction. The support portion 162 extends from the tip end portion of the base portion 161 toward the lens holding portion 140 along the X-axis direction. The support 162 has a housing recess 163 that houses the shaft 157. The accommodating recess 163 is recessed from the end surface of the support portion 162 on the positive side in the X-axis direction toward the negative side in the X-axis direction, and is also open in the Z-axis direction. The pair of flat surfaces 164 and 165 facing the Y-axis direction that form the accommodation recess 163 are parallel to each other, and are also parallel to the ZX plane. That is, the width H in the Y-axis direction of the accommodation recess 163 is substantially uniform. The pair of flat surfaces 164 and 165 sandwich the shaft portion 157 in point contact with each other in the Y-axis direction. The pair of flat surfaces 164 and 165 facing each other are separated by a width H so as to abut the shaft portion 157. That is, the shaft portion 157 can be translated in the X-axis direction and the Z-axis direction within the pair of flat surfaces 164 and 165 by sliding the spherical surface forming the outer surface on the pair of flat surfaces 164 and 165. it can. Further, when the reference of the three-dimensional orthogonal coordinate system is set to the center of the shaft portion 157, the shaft portion 157 is formed into a pair of flat surfaces 164 and 165 by the spherical surface forming the outer surface sliding on the pair of flat surfaces 164 and 165. In the sandwiched state, it can move in the rotation direction around the X axis, the rotation direction around the Y axis, and the rotation direction around the Z axis.

That is, when the reference of the three-dimensional Cartesian coordinate system is set to the center of the shaft portion 157, the shaft portion 157 has the X axis direction, the Z axis direction, the rotation direction around the X axis, the rotation direction around the Y axis, and the Z axis direction. It can move with 5 degrees of freedom in the direction of rotation.

Here, the movable degree of freedom of the shaft portion 157 has been described. However, when viewed from the lenses 42a and 42b held by the lens holding unit 140, the movable degrees of freedom are different. Since the movement of the shaft portion 157 in the Y-axis direction is regulated by the regulation portion 160, when the reference of the three-dimensional orthogonal coordinate system is set to the center of the lens 42a, the lens holding portion 140 moves around the optical axis (Z axis). Can't rotate. Even if the movement of the shaft portion 157 in the Y axis direction is restricted, if the shaft portion 157 is moved in the X axis direction while rotating the lens holding unit 140 around the Z axis with the shaft portion 157 as a reference. The lens holder 140 can be moved in the Y-axis direction.

As described above, when the reference of the three-dimensional orthogonal coordinate system is set to the center of the lens 42a, the lens holding unit 140 rotates the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, and the rotation around the Y axis. It can move in 5 degrees of freedom in the direction.

Although not shown, a regulation piece is provided in the lens barrel 3 to prevent the shaft portion 157 from coming off the accommodation recess 163 so that the shaft portion 157 does not come off from the accommodation recess 163.

The shaft portion 157 does not have to be spherical as a whole, and may be formed in a spherical surface as long as at least the pair of flat surfaces 164 and 165 can come into contact with each other.

The light emitting unit 131 emits light toward the light transmitting unit 150, and is, for example, a laser diode that emits laser light. As shown in FIGS. 2 to 4, three light emitting units 131 are provided. Each of the light emitting units 131 is arranged on the Z axis direction positive side of the light transmitting unit 150 so as to emit light toward the light transmitting unit 150. An LED (Light Emitting Diode) can be used as the light emitting unit 131.

The photodetector 132 receives the light emitted from the light emitting unit 131 and passing through the light transmitting unit 150, and outputs a light reception signal based on the received light. The photodetector 132 is, for example, a 4-division photodetector, and converts the light amount of light received in each divided region into a voltage and outputs the voltage as a light reception signal to the outside. The received light signal has a larger value as the area exposed to the light is larger. Three photodetectors 132 are provided so as to form a pair with the light emitting unit 131. Each photodetector 132 is arranged to face the light emitting unit 131 via the light transmitting unit 150. On the light receiving surface of each photodetector 132, a spot of light emitted from the light emitting section 131 and passing through the light transmitting section 150 is formed.

The light emitting unit 131 and the photodetector 132 are fixed to a support (not shown) in the lens barrel 3, and their relative positional relationship does not change. On the other hand, the positional relationship between the light transmitting section 150 and the light emitting section 131 and the photodetector 132 changes.

FIG. 10 is a front view schematically showing an arrangement example of each photodetector 132 of the optical system driving device 100 according to the first embodiment.

Each photodetector 132 includes division boundary lines L1 and L2. The division boundary lines L1 and L2 are provided so as to be orthogonal to each other at the center of the light receiving surface, and divide the light receiving surface into four evenly.

As shown in FIG. 10, the photodetector 132 is arranged such that the division boundary line L1 and the division boundary line L2 are displaced from each other by 45 degrees with respect to the X axis and the Y axis, respectively.

FIG. 11A shows that when the first light transmitting portion 150a (FIG. 7) of the optical system driving device 100 according to the first embodiment moves in the Z-axis direction, the spot of light transmitted through the first light transmitting portion 150a becomes light. It is explanatory drawing which shows how it changed in the light-receiving surface of the detector 132. FIG. 11B shows how the spot of the light transmitted through the first light transmitting portion 150 a changes on the light receiving surface of the photodetector 132 by moving the first light transmitting portion 150 a to the reference position in the Z-axis direction. FIG. FIG. 11C shows how the spot of the light transmitted through the first light transmitting portion 150 a changes on the light receiving surface of the photodetector 132 by moving the first light transmitting portion 150 a to the Z axis direction positive side. FIG.

As shown in FIG. 11B, when the first light transmitting portion 150a is at the reference position in the Z-axis direction, the light transmitted through the first light transmitting portion 150a forms a substantially circular spot P on the light receiving surface. To do. Since the axis 151 of the first light transmitting portion 150a is a cylindrical lens along the Y-axis direction, the focal position in the X-axis direction and the focal position in the Y-axis direction are displaced, and astigmatism occurs. Therefore, the shape of the spot P changes depending on the distance along the optical axis (Z-axis direction). Specifically, when the first light transmitting portion 150a moves to the negative side in the Z-axis direction, that is, when it approaches the photodetector 132, the spot P has an elliptical shape as shown in FIG. 11A. On the other hand, when the first light transmitting portion 150a moves to the Z axis direction positive side, that is, when it moves away from the photodetector 132, the spot P has an elliptical shape as shown in FIG. 11C. The longitudinal direction of the elliptical shape of the spot P deviates by 90 degrees depending on whether the first light transmitting portion 150a moves from the reference position to the positive side or the negative side in the Z-axis direction.

Even if the first light transmitting portion 150a shown in FIG. 7 moves in the Y-axis direction or rotates around the X axis, the axis 151 of the first light transmitting portion 150a is along the Y-axis direction. , The position and shape of the spot P do not change. When the first light transmitting portion 150a moves in the X-axis direction or rotates around the Y-axis, the position of the spot P moves in the X-axis direction. The same applies to the spot that is transmitted through the second light transmitting portion 150b and is formed on the light receiving surface of the second photodetector 132b.

Further, in the third light transmitting portion 150c shown in FIG. 7, since the axis 151 of the third light transmitting portion 150c is along the X axis direction, the third light transmitting portion 150c moves in the X axis direction or rotates around the Y axis. However, there is no change in the position and shape of the spot. When the third light transmitting portion 150c moves in the Y-axis direction or rotates about the X-axis, the position of the spot moves in the Y-axis direction.

From these, the relationships of the following expressions (1) to (6) are established.

Specifically, as shown in FIG. 10, a1, b1, c1, and d1 are light receiving signals (voltage values) of the respective divided regions of the first photodetector 132a facing the first light transmitting portion 150a (FIG. 7). ). Reference characters a2, b2, c2, and d2 are light reception signals of the divided regions of the second photodetector 132b that face the second light transmission unit 150b (FIG. 7). a3, b3, c3 and d3 are light reception signals of the respective divided areas of the third photodetector 132c facing the third light transmitting portion 150c (FIG. 7).

In the following, x is a variable indicating the X coordinate of the center of the lenses 42a and 42b. y is a variable indicating the Y coordinate of the center of the lenses 42a and 42b. z is a variable indicating the Z coordinate of the center of the lenses 42a and 42b. θx is a variable indicating the angle around the X axis at the center of the lenses 42a and 42b. θy is a variable indicating the angle around the Y axis at the center of the lenses 42a and 42b. Further, α1, α2, α3, β11, β12, β21, β22, γ1, and γ2 are correction coefficients. An appropriate value for the correction coefficient is obtained by various experiments, simulations, and the like.

PD11=a1-d1=α1×x+β21×θy (1)
PD12=a1+d1-(b1+c1)=α3×z+β12×θx (2)
PD21=a2-d2=α1×x+β21×θy (3)
PD22=a2+d2-(b2+c2)=α3×z−β12×θx (4)
PD31=c3-b3=α2×y+β11×θx (5)
PD32=a3+d3-(b3+c3)=α3×z+β22×θy (6)
By solving these equations (1) to (6), the relationships of the following equations (7) to (11) are derived.

θx=γ1×(PD12−PD22) (7)
θy=γ2×(PD32−(PD12+PD22/2)) (8)
x=PD11−β2×θy=(PD11−β21×γ2×(PD32−(PD12+PD22/2)))/α1 (9)
y=PD31−β1×θx=(PD31−β11×γ1×(PD12−PD22))/α2 (10)
z=(PD12+PD22)/(2×α3) (11)
The lens control unit 36 calculates based on the received light signal output from each photodetector 132 and the above relational expressions (1) to (11), and detects the position of each degree of freedom of the lens holding unit 140. .. The lens control unit 36 is a calculation unit that calculates the position of each degree of freedom. Further, the light emitting unit 131, the photodetector 132, and the lens control unit 36 configure the detection unit 200 (see FIG. 1).

[1-2. motion]
The operation of the digital camera 1 configured as described above will be described below.

FIG. 12 is a flowchart showing the flow of a shooting process executed by the control unit 22 of the digital camera 1 according to the first embodiment.

As shown in FIG. 12, when a zoom operation is performed from the zoom lever, the control unit 22 controls the zoom drive unit 31 via the lens control unit 36 during the operation so that the first lens group 41 is illuminated. It is moved along the axis (step S1). The control unit 22 recognizes and stores the zoom position of the first lens group 41 based on the output result from the zoom encoder 33 when the zoom operation is completed (step S2).

Next, when the autofocus operation is performed from the shutter button, the control unit 22 controls the focus drive unit 32 via the lens control unit 36 during the operation to move the third lens group 43 along the optical axis. It is moved (step S3). The control unit 22 recognizes and stores the in-focus position of the third lens group 43 based on the output result from the focus encoder 34 (step S4).

Next, the control unit 22 calculates the position correction value of the second lens group 42 from the zoom position of the first lens group 41 and the focus position of the third lens group 43 (step S5).

Next, the control unit 22 outputs the position correction value of the second lens group 42 to the lens control unit 36 and causes the lens control unit 36 to execute the attitude control process (step S6).

FIG. 13 is a flowchart showing the flow of the attitude control process executed by the lens controller 36 of the optical system driving device 100 according to the first embodiment.

As shown in FIG. 13, the lens control unit 36 controls the currents of the first coils 181 and the second coils 182 in all the magnet units 170 based on the position correction values acquired from the control unit 22 (step S61). .. Specifically, the lens control unit 36 obtains each correction value of 5 degrees of freedom from the position correction value, and the first coil 181 and the second coil 182 in all the magnet units 170 are calculated from the correction value of each degree of freedom. Determine the current value of.

As a result, the lens holding unit 140 moves with five degrees of freedom in the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, and the rotation direction around the Y axis (step S62).

Next, the lens control unit 36 detects the position of each degree of freedom of the lens holding unit 140 (step S63). Specifically, the lens control unit 36 causes each light emitting unit 131 to emit light, and irradiates each photodetector 132 with light from each light emitting unit 131 via each light transmitting unit 150. As a result, the light receiving signal of each divided area is output from each photodetector 132 to the lens controller 36. The lens control unit 36 calculates based on this received light signal and the above-mentioned relational expression, and detects the position of each degree of freedom of the lens holding unit 140.

Next, the lens control unit 36 determines whether the detected position of each degree of freedom of the lens holding unit 140 matches the position of each degree of freedom based on the position correction value (step S64).

If it is determined in step S64 that they match (Yes in step S64), the lens control unit 36 ends the attitude control process and proceeds to step S7 shown in FIG.

When it is determined in step S64 that they do not match (No in step S64), the lens control unit 36 calculates a new position correction value from the detected position of each degree of freedom of the lens holding unit 140 (step S65). ), and proceeds to step S61.

As shown in FIG. 12, in step S7, the control unit 22 executes imaging when the shutter button is completely pressed.

[1-3. Effect, etc.]
As described above, according to the present embodiment, since the light transmitting portion 150 is integrally provided with the lens holding portion 140 that is a movable body that can move in at least three degrees of freedom, the light transmitting portion is concerned. The lens holder 150 moves together with the lens holder 140. As a result, the light transmitting section 150 moves with the same degree of freedom as the lens holding section 140. If the light transmitting part 150 moves together with the lens holding part 140, at least one of the shape, the intensity, and the distribution of the light spot P formed on the photodetector 132 through the light transmitting part 150 changes according to the movement. .. The photodetector 132 outputs a light reception signal based on the received light. Therefore, by using this received light signal, the position of each degree of freedom of the lens holding unit 140 can be obtained with high accuracy.

Therefore, it is possible to detect the position of the movable body that can move in at least three degrees of freedom in each degree of freedom, and it is possible to perform highly accurate position adjustment.

Further, since the light transmitting portion 150 for detecting the position of each degree of freedom is integrated with the lens holding portion 140, the light transmitting portion 150 can move together with the lens holding portion 140 with the same degree of freedom. Therefore, it is possible to detect a position with at least three degrees of freedom with a simple configuration.

Further, since the light transmitting section 150 is a light collector, it is possible to collect the light that has passed through the light transmitting section 150 and irradiate the light on the photodetector 132. On the photodetector 132, the intensity of the light is amplified by condensing, so that the fluctuation of the light can be reliably detected.

Further, since the spot of light is reduced by being condensed, it is possible to use a small photodetector 132.

Further, since the light condensing body is a cylindrical lens, accurate position detection using the astigmatism method is possible.

Further, since three sets of the light emitting section 131 and the photodetector 132 are provided, if the light reception signals of the three photodetectors 132 are used in combination, four degrees of freedom or more (5 degrees of freedom in this embodiment). The position of the lens holder 140 can be detected.

As described above, the optical system driving apparatus 100 according to the present embodiment is provided integrally with the moving body corresponding to the lens holding unit 140 that is movable in at least three degrees of freedom, and moves together with the moving body. And a light transmission part 150. Further, a drive unit corresponding to the aberration correction drive unit 120 that moves the moving body for each of at least three degrees of freedom, and a detection unit 200 that detects the position of each moving body of at least three degrees of freedom. Prepare In addition, the detection unit 200 receives light emitted from the light emitting unit 131 and passes through the light transmitting unit 150, and receives a light reception signal based on the received light. And a photodetector 132 for outputting. Further, each position of at least three degrees of freedom is detected based on the light reception signal of the photodetector 132. Accordingly, it is possible to detect the position of the movable body that can move in at least three degrees of freedom in each degree of freedom, and highly accurate position adjustment is possible.

Further, the light transmitting section 150 may be a light collecting body that collects light. Thereby, the photodetector 132 can reliably detect the fluctuation of light.

Further, the light collector may be a cylindrical lens. This enables accurate position detection using the astigmatism method.

Further, the detection unit 200 may include three or more sets of the light emitting unit 131 and the photodetector 132. As a result, the position of the moving body having four or more degrees of freedom can be detected.

The moving body may be movable in at least 5 degrees of freedom. As a result, the position of the moving body with five degrees of freedom can be detected. Therefore, the number of parts can be reduced.

Further, the detection unit 200 may detect the position of each moving body having five degrees of freedom. As a result, the number of parts can be reduced.

Further, the optical device 1 of the present embodiment may include the optical system driving device 100 and the optical system 4 including a plurality of lenses. Further, at least one of the plurality of lenses may be held by the moving body. This enables highly accurate position adjustment of the moving body.

Further, the optical device 1 according to the present embodiment may include the optical system driving device 100 and an optical system including a plurality of lenses. Further, at least one of the plurality of lenses may be held by the moving body, and the light transmitting portion 150 may be a lens held by the moving body. This enables highly accurate position adjustment of the moving body.

(Embodiment 2)
[2-1. Constitution]
The second embodiment will be described below with reference to FIGS. 14, 15A and 15B. The same components as those in the first embodiment are designated by the same reference numerals, and description of the same components and operations may be omitted.

FIG. 14 is a perspective view of the optical system driving device 100A according to the present embodiment.

As shown in FIG. 14, the light transmission part 150 (fourth light transmission part 150d) is attached to the fourth piece part 144A of the lens holding part 140A in the optical system driving device 100A. As shown in FIG. 15A, the fourth light transmitting portion 150d is, for example, a convex cylindrical lens, the axis 151 of which is along the X-axis direction, and the convex surface 152 faces the negative side in the Z-axis direction.

The first piece 141A, the second piece 142A, the third piece 143A, and the fourth piece 144A are provided with an elastic body 167 such as a spring on the principal surface on the Z axis direction negative side. The elastic body 167 extends parallel to the Z-axis direction, one end thereof is attached to the main surface of each of the pieces 141A, 142A, 143A, 144A on the negative side in the Z-axis direction, and the other end is attached to the lens barrel 3. It is attached to an inner support (not shown). The lens holding portion 140A is held by the elastic body 167 so as not to be restricted in movement in any degree of freedom and to be swingable. That is, the lens holding unit 140A can move in six degrees of freedom in the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, the rotation direction around the Y axis, and the rotation direction around the Z axis. ..

The light emitting unit 131 and the photodetector 132 are provided so as to face each other in the Z-axis direction with the fourth light transmitting unit 150d interposed therebetween.

FIG. 15B is a front view schematically showing an arrangement example of the photodetectors 132 of the optical system driving device 100A according to the second embodiment.

As shown in FIG. 15B, the photodetector 132 is arranged such that the division boundary line L1 and the division boundary line L2 are shifted by 45 degrees with respect to the X axis and the Y axis, respectively.

The first light transmitting portion 150a, the second light transmitting portion 150b, and the third light transmitting portion 150c have the same arrangement as that illustrated in FIG.

Further, since the axis 151 of the fourth light transmitting portion 150d is along the X-axis direction, even if the fourth light transmitting portion 150d moves in the X-axis direction or rotates around the Y-axis, a spot is generated. There is no change in the position and shape of P. When the fourth light transmitting portion 150d moves in the Y-axis direction or rotates about the X-axis, the position of the spot P moves in the Y-axis direction.

From these, the relationships of the following equations (12) to (19) are established.

Specifically, as shown in FIG. 15B, a1, b1, c1, and d1 are light reception signals (voltage values) of the respective divided regions of the first photodetector 132a facing the first light transmitting portion 150a. Symbols a2, b2, c2, d2 are light reception signals of the respective divided regions of the second photodetector 132b facing the second light transmitting portion 150b. a3, b3, c3 and d3 are light reception signals of the respective divided areas of the third photodetector 132c facing the third light transmitting section 150c. Symbols a4, b4, c4 and d4 are light reception signals of the respective divided areas of the fourth photodetector 132d that face the fourth light transmitting portion 150d.

In the following, x is a variable indicating the X coordinate of the center of the lenses 42a and 42b. y is a variable indicating the Y coordinate of the center of the lenses 42a and 42b. z is a variable indicating the Z coordinate of the center of the lenses 42a and 42b. θx is a variable indicating the angle around the X axis at the center of the lenses 42a and 42b. θy is a variable indicating the angle around the Y axis at the center of the lenses 42a and 42b. θz is a variable indicating the angle around the Z axis at the center of the lenses 42a and 42b. Further, α1, α2, α3, β11, β12, β21, β22, β3 are correction coefficients. An appropriate value for the correction coefficient is obtained by various experiments, simulations, and the like.

PD11=a1-d1=α1×x+β21×θy+β3×θz (12)
PD12=a1+d1-(b1+c1)=α3×z+β12×θx (13)
PD21=a2-d2=α1×x+β21×θy−β3×θz (14)
PD22=a2+d2-(b2+c2)=α3×z−β12×θx (15)
PD31=c3-b3=α2×y+β11×θx+β3×θz (16)
PD32=a3+d3-(b3+c3)=α3×z+β22×θy (17)
PD41=c4-b4=α2×y+β12×θx−β3×θz (18)
PD42=a4+d4-(b4+c4)=α3×z−β22×θy (19)
By solving these equations (12) to (19), the relationships of the following equations (20) to (25) are derived.

θx=(PD12−PD22)/(2×α3) (20)
θy=(PD32−PD42)/(2×α3) (21)
θz=(PD11−PD21+PD31−PD41)/(4×β3) (22)
x=((PD11+PD21)−β21×(PD32−PD42)/α3)/(2×α3)...(23)
y=((PD31+PD41)−(PD11−PD21+PD31−PD41)/2)/(2×α3) (24)
z=(PD12+PD22+PD32+PD42)/4 (25)
The lens control unit 36 calculates based on the received light signal output from each photodetector 132 and the above equations (12) to (25), and detects the position of each degree of freedom of the lens holding unit 140. The lens control unit 36 controls the currents of the first coils 181 and the second coils 182 in all the magnet units 170 based on the position correction values acquired as in the first embodiment (FIG. 13). As a result, the lens holding unit 140A moves with 6 degrees of freedom in the X-axis direction, the Y-axis direction, the Z-axis direction, the rotation direction around the X axis, the rotation direction around the Y axis, and the rotation direction around the Z axis.

[2-2. Effect, etc.]
As described above, according to the present embodiment, since four sets of the light emitting section 131 and the photodetector 132 are provided, if the light receiving signals of the four photodetectors 132 are used in combination, six degrees of freedom are obtained. The position of can be detected. Thereby, accurate position adjustment is possible.

(Embodiment 3)
[3-1. Constitution]
The third embodiment will be described below with reference to FIGS. 16 to 19. The same components as those in the first embodiment are designated by the same reference numerals, and description of the same components and operations may be omitted.

FIG. 16 is a perspective view of the optical system driving device 100B according to the third embodiment.

As shown in FIG. 16, the lens holding portion 140B of the optical system driving device 100B is not provided with the first to third piece portions 141 to 143, but only the fourth piece portion 144 having the shaft portion 157. Is provided. Since the movement of the shaft portion 157 in the Y-axis direction is regulated by the regulation portion 160, the lens holding portion 140B is arranged in the X-axis direction, the Y-axis direction, the Z-axis direction, and around the X-axis as in the first embodiment. It can move in five degrees of freedom in the rotation direction and the rotation direction around the Y axis.

FIG. 17 is a cross-sectional view of the lens holding unit 140B taken along the line 17-17 in FIG. Specifically, the 17-17 cutting line is a line parallel to the X axis and passing through the centers of the lenses 42a and 42b.

As shown in FIG. 17, a light emitting portion 131B is provided outside the lens 42a on the positive side in the X-axis direction. The light emitting unit 131B emits light along the X-axis direction toward the end of the lens 42a on the positive side in the X-axis direction. Part of the light emitted from the light emitting unit 131B is reflected by the end surface of the lens 42a on the positive side in the X-axis direction. The photodetector 132B is arranged on the optical path of the light reflected by the surface of the lens 42a.

Further, a part of the light emitted from the light emitting unit 131B enters the lens 42a and is totally reflected by the boundary surface of the lens 42a several times (three times in the present embodiment), and then X of the lens 42a. The light is emitted from the end surface on the negative side in the axial direction to the outside of the lens 42a. The photodetector 132B is arranged on the optical path of the light emitted from the lens 42a.

In this way, the light emitted from the light emitting unit 131B passes (reflects or transmits) through the lens 42a and reaches the photodetector 132B. That is, the lens 42a functions as a light transmitting portion.

Similarly, one light emitting portion 131B and a pair of photodetectors 132B are also provided in the Y-axis direction. The light emitting portion 131B provided in the Y-axis direction is arranged outside the lens 42a on the positive side in the Y-axis direction. A pair of photodetectors 132B is arranged on the optical path of the light emitted from the light emitting section 131B. Also in the Y-axis direction, the light emitted from the light emitting unit 131B passes through the lens 42a (reflection or transmission) and reaches the photodetector 132B.

FIG. 18 is a front view schematically showing an arrangement example of each photodetector 132 of the optical system driving device 100B according to the third embodiment.

As shown in FIG. 18, the photodetector 132B is arranged such that the division boundary line L1 is along the Y axis and the division boundary line L2 is along the X axis direction.

In FIG. 18, a1, b1, c1, and d1 are light reception signals of the respective divided regions of the photodetector (first photodetector 132Ba) arranged on the Y axis direction positive side. Symbols a2, b2, c2, and d2 are light reception signals of the respective divided areas of the photodetector (second photodetector 132Bb) arranged on the Y axis direction negative side. a3, b3, c3, d3 are light reception signals of the respective divided areas of the photodetector (third photodetector 132Bc) arranged on the X axis direction positive side. Symbols a4, b4, c4 and d4 are light reception signals of the respective divided regions of the photodetector (fourth photodetector 132Bd) arranged on the negative side in the X-axis direction.

FIG. 19 is a graph showing the difference between the light reception signal of the third photodetector 132Bc and the light reception signal of the fourth photodetector 132Bd depending on the attitude of the lens holding unit 140B of the optical system driving device 100B according to the third embodiment. Is.

As shown in FIG. 19, when the lens holding unit 140B moves to the Z axis direction positive side, the light reception signal of the third photodetector 132Bc becomes a positively large value, and the light reception signal of the fourth photodetector 132Bd becomes The value is close to 0. When the lens holding unit 140B moves toward the negative side in the Z-axis direction, the light reception signal of the third photodetector 132Bc has a large negative value, and the light reception signal of the fourth photodetector 132Bd has a value close to 0. There is.

When the lens holding unit 140B moves to the positive side around the X axis, the light reception signal of the third photodetector 132Bc has a positively small value, and the light reception signal of the fourth photodetector 132Bd has a negatively small value. ing. When the lens holder 140B is moved to the negative side around the X axis, the light reception signal of the third photodetector 132Bc has a small negative value, and the light reception signal of the fourth photodetector 132Bd has a small positive value. ing.

When the lens holder 140B is moved to the positive side in the Y-axis direction, the light reception signal of the third photodetector 132Bc has a value close to 0, and the light reception signal of the fourth photodetector 132Bd has a large negative value. There is. When the lens holding unit 140B moves to the negative side in the Y-axis direction, the light reception signal of the third photodetector 132Bc has a value close to 0, and the light reception signal of the fourth photodetector 132Bd has a positively large value. There is. As described above, the light emitting unit 131 and the photodetector 132B are arranged so that the sensitivities of the received light signals to the photodetector 132B with respect to the variation in the Z-axis direction, the variation in the Y-axis direction, and the rotation around the X-axis are different. ..

Similarly, the difference between the light reception signal of the first photodetector 132Ba and the light reception signal of the second photodetector Bb is also obtained. From these facts, the relationships of the following expressions (26) to (39) are established.

In the following, x is a variable indicating the X coordinate of the center of the lenses 42a and 42b. y is a variable indicating the Y coordinate of the center of the lenses 42a and 42b. z is a variable indicating the Z coordinate of the center of the lenses 42a and 42b. θx is a variable indicating the angle around the X axis at the center of the lenses 42a and 42b. θy is a variable indicating the angle around the Y axis at the center of the lenses 42a and 42b. Further, α1, α2, α3, β1, β2 are correction coefficients. An appropriate value for the correction coefficient is obtained by various experiments, simulations, and the like.

PD11=(a1+b1)-(c1+d1)=α3×z (26)
PD12=(a1+c1)-(b1+d1)=α1×x+β1×θx (27)
PD21=(a2+b2)-(c2+d2)=α2×y (28)
PD22=(a2+c2)-(b2+d2)=α1×x+β1×θx (29)
PD31=(a3+c3)-(b3+d3)=α3×z (30)
PD32=(a3+b3)-(c3+d3)=α2×y+β2×θy (31)
PD41=(a4+c4)-(b4+d4)=α1×x (32)
PD42=(a4+b4)-(c4+d4)=α2×y+β2×θy (33)
PD12=PD22...(34)
PD32=PD42...(35)
PD11-PD21=α3×z−α2×y (36)
PD12-PD31=α1×x−α3×z (37)
PD31-PD41=α3×z−α1×x (38)
By solving these equations (26) to (38), the relationships of the following equations (39) to (43) are derived.

x=α1×PD31 (39)
y=α2×PD21...(40)
z=α3×(PD11+PD31)/2 (41)
θx=(PD12−α1×PD31)/β1...(42)
θy=(PD32−α2×PD21)/β2 (43)
The lens control unit 36 calculates based on the received light signal output from each photodetector 132 and the above equations (26) to (44), and detects the position of each degree of freedom of the lens holding unit 140. The lens control unit 36 controls the currents of the first coils 181 and the second coils 182 in all the magnet units 170 based on the position correction values acquired as in the first embodiment (FIG. 13). As a result, the lens holding unit 140A moves with five degrees of freedom in the X axis direction, the Y axis direction, the Z axis direction, the rotation direction around the X axis, and the rotation direction around the Y axis.

[3-2. Effect, etc.]
As described above, according to the present embodiment, the following effects are obtained in addition to the same effects as those of the first and second embodiments. That is, since the lens 42a held by the lens holding portion 140B is a light transmitting portion, the position of each movable degree of freedom of the lens holding portion 140B can be detected without separately providing a light transmitting portion dedicated to position detection. You can Therefore, the number of parts can be reduced.

Further, since the two light detectors 132B correspond to one light emitting unit 131B, the number of light emitting units 131B to be installed is reduced as compared with the configuration in which the light emitting units 131B and the photodetectors 132B are associated one by one. Therefore, the number of parts can be reduced.

(Embodiment 4)
[4-1. Constitution]
Hereinafter, Embodiment 4 will be described with reference to FIGS. 20 and 21A to 21G.

FIG. 20 is a perspective view of the optical system driving device 100C according to the fourth embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and description of the same components and operations may be omitted.

As shown in FIG. 20, the lens holding portion 140C of the optical system driving device 100C is not provided with the first piece portion 141 and the second piece portion 142, and is provided with the third piece portion 143 and the shaft portion 157. Only the 4th piece part 144 which it has is provided. Since the movement of the shaft portion 157 in the Y-axis direction is regulated by the regulation portion 160, the lens holding portion 140C is arranged in the X-axis direction, the Y-axis direction, the Z-axis direction, and around the X-axis as in the first embodiment. It can move in five degrees of freedom in the rotation direction and the rotation direction around the Y axis.

A light transmitting portion 150C such as a substantially disk-shaped condenser lens is attached to the third piece portion 143. The light emitting section 131 is arranged on the Z axis direction positive side of the light transmitting section 150C so as to emit light toward the light transmitting section 150C. Further, a photodetector 132C is provided at a position facing the light emitting unit 131 via the light transmitting unit 150C. The photodetector 132C is an image pickup device such as a CCD. The image pickup device picks up an image of the spot P, converts light into voltage for each pixel, and outputs it as a light reception signal. Since the image sensor has a larger number of light receiving surfaces (pixels) than the four-division photo detector, the shape, intensity, and distribution of the spot P can be detected with higher precision.

The spot P of the light emitted from the light emitting unit 131 and transmitted through the light transmitting unit 150C changes on the light receiving surface of the photodetector 132C according to the amount of change and the moving direction when the lens holding unit 140C moves.

In FIG. 21A, when the lens holding unit 140C of the optical system driving device 100C according to the fourth embodiment is not moved from the reference position, the spot P of the light transmitted through the light transmitting unit 150C is the light receiving surface of the photodetector 132C. It is explanatory drawing which shows how it changed. 21A to 21G, the horizontal direction is the X-axis direction, and the vertical direction is the Y-axis direction. FIG. 21B shows that, when the lens holding unit 140C of the optical system driving device 100C according to the fourth embodiment moves to the positive side in the X-axis direction, the spot P of the light transmitted through the light transmitting unit 150C is the light receiving surface of the photodetector 132C. It is explanatory drawing which shows how it changed. FIG. 21C is an explanatory diagram showing how the spot P of the light transmitted through the light transmitting portion 150C changes on the light receiving surface of the photodetector 132C when the lens holding portion 140C moves to the Y axis direction positive side. Is. FIG. 21D is an explanatory diagram showing how the spot P of the light transmitted through the light transmitting portion 150C changes on the light receiving surface of the photodetector 132C when the lens holding portion 140C moves to the Z axis direction positive side. Is. FIG. 21E is an explanatory diagram showing how the spot P of the light transmitted through the light transmitting unit 150C changes on the light receiving surface of the photodetector 132C when the lens holding unit 140C moves to the Z axis direction negative side. Is. FIG. 21F is an explanatory diagram showing how the spot P of the light transmitted through the light transmitting portion 150C changes on the light receiving surface of the photodetector 132C when the lens holding portion 140C rotates around the X axis. .. FIG. 21G is an explanatory diagram showing how the spot P of the light transmitted through the light transmitting portion 150C changes on the light receiving surface of the photodetector 132C when the lens holding portion 140C rotates around the Y axis. ..

In FIG. 21A, the center of the spot P coincides with the center of the photodetector 132C. In FIG. 21B, when the lens holding unit 140C moves in the X-axis direction, the spot P also moves in the X-axis direction according to the amount of movement. In FIG. 21C, when the lens holder 140C moves in the Y-axis direction, the spot P also moves in the Y-axis direction according to the amount of movement. In FIG. 21D, when the lens holding unit 140C moves to the Z axis direction positive side, the spot P increases according to the amount of movement, and the light weakens as a whole. In FIG. 21E, when the lens holding unit 140C moves to the negative side in the Z-axis direction, the spot P becomes smaller according to the amount of movement and the light becomes stronger as a whole. In FIG. 21F, when the lens holding unit 140C rotates about the X axis, the positive side or the negative side of the spot P in the Y axis direction diverges according to the rotation amount. In FIG. 21G, when the lens holding unit 140C rotates around the Y axis, the positive side or the negative side of the spot P in the X axis direction diverges according to the rotation amount.

By analyzing these relationships in a composite manner, the spot P can be imaged by the photodetector 132C, and the position of each degree of freedom of the lens holding unit 140C can be detected from the received light signals of many pixels.

[4-2. Effect, etc.]
As described above, according to the present embodiment, the following effects are obtained in addition to the same effects as those of the first and second embodiments. That is, since the photodetector 132C is an image sensor, the shape, intensity, and distribution of the spot P can be detected with higher precision. Therefore, even if there is only one photodetector 132C, the position of each degree of freedom of the lens holder 140C can be detected. Further, if the number of photodetectors 132C is one, the number of light emitting units 131 is also one, and the number of parts can be further reduced.

(Other embodiments)
As described above, the first to fourth embodiments have been described as examples of the technique disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to the embodiment in which changes, replacements, additions, omissions, etc. are appropriately made. Further, it is also possible to combine the constituent elements described in the first to fourth embodiments to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In the first to fourth embodiments, the case where the optical system driving device 100 moves the lens has been described as an example, but it is also possible to use it for moving other optical elements. Examples of optical elements other than lenses include mirrors and light guide plates.

Further, in Embodiments 1 to 4, the image pickup apparatus such as the digital camera 1 is exemplified as the optical apparatus, but other optical apparatuses may be used. Other optical devices include a projection device such as a projector.

In addition, in the first to fourth embodiments, the aberration correction drive unit 120 including the magnet unit 170, the first coil 181, and the second coil 182 is illustrated as the drive unit and described. The drive unit may be any unit that moves the lens holding unit 140 (moving body) with respect to the movable degree of freedom. For example, a multi-degree-of-freedom actuator using a motor may be used as the drive unit.

Further, in the first to fourth embodiments, the case where the lens holding unit 140, which is a moving body, can be moved with 5 degrees of freedom or 6 degrees of freedom is illustrated. However, the lens holding unit 140 only needs to be movable with at least three degrees of freedom.

In the fourth embodiment, the CCD is exemplified as the image pickup element which is an example of the photodetector. The image sensor may be any device that images a spot of light, converts the light into a voltage for each pixel, and outputs the voltage as a light reception signal. Therefore, the image pickup device is not limited to the CCD. However, if a CCD is used as the image sensor, the image sensor can be obtained at low cost. Moreover, you may use a CMOS image sensor as an imaging element. The use of a CMOS image sensor as the image pickup element is effective in suppressing power consumption.

In the first to fourth embodiments, the lens control unit 36 has been described as an example of the calculation unit. The arithmetic unit may have any physical configuration as long as it can detect the position of each degree of freedom from the light reception signal of the photodetector 132. Further, if a programmable microcomputer is used as the arithmetic unit, the processing content can be changed by changing the program, so that the degree of freedom in designing the arithmetic unit can be increased. Further, the arithmetic unit may be realized by hard logic. It is effective to improve the processing speed if the arithmetic unit is realized by hard logic. The arithmetic unit may be composed of one element or may be physically composed of a plurality of elements. When it is configured by a plurality of elements, each control described in the claims may be realized by another element. In this case, it can be considered that one of the plurality of elements constitutes one arithmetic unit. Further, the arithmetic unit and the member having a different function may be configured by one element.

As described above, the embodiments have been described as examples of the technology according to the present disclosure. To that end, the accompanying drawings and detailed description are provided.

Therefore, among the constituent elements described in the accompanying drawings and the detailed description, not only constituent elements essential for solving the problem but also constituent elements not essential for solving the problem in order to exemplify the above technology. Can also be included. Therefore, it should not be immediately recognized that the non-essential components are essential, because the non-essential components are described in the accompanying drawings and the detailed description.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the scope of equivalents thereof.

The present disclosure can be applied to an optical system drive device for moving a movable body that is movable in at least three degrees of freedom and an optical device including the same. Specifically, the present disclosure is applicable to digital cameras, movies, projectors, and the like.

1 Digital camera (optical device)
2 camera body 3 lens barrel 4 optical system 5 optical axis 21 image sensor 22 control unit 31 zoom drive unit 32 focus drive unit 33 zoom encoder 34 focus encoder 36 lens control unit (arithmetic unit)
41 first lens group 42 second lens group 42a lens 42b lens 43 third lens group 100 optical system driving device 100A optical system driving device 100B optical system driving device 100C optical system driving device 110 support mechanism 120 aberration correction driving unit 131 light emission Part 131B Light emitting part 132 Photodetector 132B Photodetector 132C Photodetector 132a First photodetector 132b Second photodetector 132c Third photodetector 132d Fourth photodetector 132Ba First photodetector 132Bb Second light Detector 132Bc Third photodetector 132Bd Fourth photodetector 140 Lens holder (moving body)
140A lens holding part 140B lens holding part 140C lens holding part 141 first piece part 141A first piece part 142 second piece part 142A second piece part 143 third piece part 143A third piece part 144 fourth piece part 144A fourth One part 145 Frame body 146 Frame body 147 Frame body 148 Frame body 150 Light transmitting portion 150a First light transmitting portion 150b Second light transmitting portion 150c Third light transmitting portion 150d Fourth light transmitting portion 151 Shaft center 152 Convex surface 153 Flat surface 160 Restriction part 161 Base part 162 Support part 163 Housing recess 164 Flat surface 165 Flat surface 170 Magnet unit 171 Plate magnet 172 Plate magnet 181 First coil 182 Second coil 200 Detection part

Claims (12)

A moving body that can move in at least three degrees of freedom,
A light transmission part that is provided integrally with the moving body and moves together with the moving body;
A drive unit that moves the moving body for each of the at least three degrees of freedom;
A detection unit that detects the position of the moving body in each of the at least three degrees of freedom,
The detection unit,
A light emitting unit that emits light toward the light transmitting unit,
A photodetector that is irradiated from the light emitting unit, receives light that has passed through the light transmitting unit, and outputs a light reception signal based on the received light.
Have
The detection unit, based on the position of the spot received by the photodetector , and the change in the shape of the spot with respect to the shape of the spot when the light transmission unit is at the reference position, each of the at least three degrees of freedom. An optical system driving device for detecting the position of the moving body. The optical system driving device according to claim 1, wherein the light transmitting portion is a cylindrical lens that collects light. The optical system driving device according to claim 1, wherein the detection unit includes three or more sets of the light emitting unit and the photodetector. The optical system driving device according to claim 1, wherein the photodetector is an image sensor. The moving body has a structure capable of supporting an optical element,
The at least 3 degrees of freedom are
The degree to which the movable body can be displaced along the first axis that is the optical axis,
The degree to which the movable body can be displaced along a second axis orthogonal to the first axis in a plane orthogonal to the first axis;
The degree of displacement of the moving body along a third axis orthogonal to the second axis in the plane,
The optical system driving device according to claim 1. The movable body is movable in at least 5 degrees of freedom,
The detection unit, based on the position of the spot received in the photodetector, the magnitude of the received light signal, and the change in the shape of the spot with respect to the shape of the spot when the light transmission unit is at the reference position, Detecting the position of each said moving body in at least 5 degrees of freedom,
The optical system driving device according to claim 1. The moving body has a structure capable of supporting an optical element,
The at least 5 degrees of freedom are
The degree to which the movable body can be displaced along the first axis that is the optical axis,
The degree to which the movable body can be displaced along a second axis orthogonal to the first axis in a plane orthogonal to the first axis;
The degree to which the movable body can be displaced along a third axis orthogonal to the second axis in the plane,
The degree to which the moving body can be displaced around the second axis,
And a degree to which the movable body can be displaced around the third axis,
The optical system driving device according to claim 6. The at least three degrees of freedom further includes a degree to which the moving body can be displaced around the first axis,
The optical system driving device according to claim 7. An optical system driving device according to claim 1;
An optical system including one or more optical elements,
At least one of the one or more optical elements is a lens barrel held by the moving body. An optical system driving device according to claim 1;
An optical system including one or more optical elements,
At least one of the one or more optical elements is held by the moving body,
The light transmission part is a lens barrel which is an optical element held by the moving body. A lens barrel according to claim 9;
A main body for acquiring or projecting an image through the optical system of the lens barrel,
An optical device comprising. A lens barrel according to claim 10;
A main body for acquiring or projecting an image through the optical system of the lens barrel,
An optical device comprising.