Lens system, control method, and storage medium

Abstract

To reduce the possibility of giving discomfort to a person.SOLUTION: The lens system 100 includes a lens unit 1, an X-axis actuator 3, a Y-axis actuator 4, and a controller 10. The lens unit 1 includes a lens 11. The X-axis actuator 3 moves the lens unit 1 in the X-axis direction. The Y-axis actuator 4 moves the lens unit 1 in the Y-axis direction orthogonal to the X-axis direction. The control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4. When the lens unit 1 is moved from the first position to the second position, the control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4 so that the driving time of the X-axis actuator 3 and the driving time of the Y-axis actuator 4 are the same.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure generally relates to a lens system, a control method, and a program, and more particularly to a lens system including a control unit, a control method, and a program. [Background technology]

[0002] Patent Document 1 discloses a lens driving device that drives a lens. The lens driving device includes a lens driving unit. The lens driving device has an optical axis of a lens attached to the lens driving unit. The lens driving unit includes a base member, an X-axis movable body, a Y-axis movable body, and a lens carrier. The base member, the X-axis movable body, the Y-axis movable body, and the lens carrier are arranged in this order along the optical axis direction. The lens carrier has a lens mounting portion for mounting a lens. The lens driving device also includes an X-axis actuator, a Y-axis actuator, and a carrier actuator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-18018 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a lighting fixture that includes a lens system that can move lenses in the X-axis and Y-axis directions and a light source, it is possible to change the direction of light emission. In such a lighting fixture, changing the direction of light emission may cause discomfort to people who view the light.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a lens system, a control method, and a program that can reduce the possibility of causing discomfort to people. [Means for solving the problem]

[0006] A lens system according to one aspect of the present disclosure includes a lens unit, a housing, an X-axis actuator, a Y-axis actuator, and a control unit. The lens unit includes a lens and a lens holding member that holds the lens. The housing accommodates the lens unit. The X-axis actuator is fixed to the housing and moves the lens unit in the X-axis direction. The Y-axis actuator is fixed to the housing and moves the lens unit in the Y-axis direction that is perpendicular to the X-axis direction. The control unit controls the X-axis actuator and the Y-axis actuator. When moving the lens unit from a first position to a second position, the control unit controls the X-axis actuator and the Y-axis actuator so that the drive time of the X-axis actuator and the drive time of the Y-axis actuator are the same.

[0007] A lens system according to one aspect of the present disclosure includes a lens unit, a housing, an X-axis actuator, a Y-axis actuator, and a control unit. The lens unit includes a lens and a lens holding member that holds the lens. The housing accommodates the lens unit. The X-axis actuator is fixed to the housing and moves the lens unit in the X-axis direction. The Y-axis actuator is fixed to the housing and moves the lens unit in the Y-axis direction that is perpendicular to the X-axis direction. The control unit controls the X-axis actuator and the Y-axis actuator. When the lens unit is moved from a first position to a second position along a direction that intersects both the X-axis direction and the Y-axis direction, the control unit controls the X-axis actuator and the Y-axis actuator so that the trajectory of the lens unit is linear.

[0008] A control method according to one aspect of the present disclosure is a method for controlling a lens system. The lens system includes a lens unit, a housing, an X-axis actuator, and a Y-axis actuator. The lens unit includes a lens and a lens holding member that holds the lens. The housing accommodates the lens unit. The X-axis actuator is fixed to the housing and moves the lens unit in an X-axis direction. The Y-axis actuator is fixed to the housing and moves the lens unit in a Y-axis direction that is perpendicular to the X-axis direction. The control method controls the X-axis actuator and the Y-axis actuator so that, when moving the lens unit from a first position to a second position, a drive time of the X-axis actuator and a drive time of the Y-axis actuator are the same.

[0009] A control method according to one aspect of the present disclosure is a method for controlling a lens system. The lens system includes a lens unit, a housing, an X-axis actuator, and a Y-axis actuator. The lens unit includes a lens and a lens holding member that holds the lens. The housing accommodates the lens unit. The X-axis actuator is fixed to the housing and moves the lens unit in an X-axis direction. The Y-axis actuator is fixed to the housing and moves the lens unit in a Y-axis direction that is perpendicular to the X-axis direction. The control method controls the X-axis actuator and the Y-axis actuator so that the trajectory of the lens unit is linear when the lens unit is moved from a first position to a second position along a direction that intersects both the X-axis direction and the Y-axis direction.

[0010] A program according to one aspect of the present disclosure is a program for causing one or more processors to execute the control method. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to reduce the possibility of causing discomfort to people. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a plan view of a lighting fixture including a lens system according to an embodiment, with the lens in a reference position. [Figure 2] FIG. 2 is a front view of the lighting fixture including the lens system when the lens is in a reference position. [Figure 3] FIG. 3 is a side view of the lighting fixture including the lens system when the lens is in a reference position. [Figure 4] FIG. 4 is an explanatory diagram of the relative positional relationship between the X-axis play mechanism, the Y-axis play mechanism, and the Z-axis play mechanism in the lens system. [Figure 5] FIG. 5 is a configuration diagram of an illumination system including the lens system. [Figure 6] FIG. 6 is an explanatory diagram of a control signal output by a control unit of the lens system. [Figure 7] FIG. 7 is an explanatory diagram of the trajectory of the lens when the lens is moved from a first position to a second position in the lens system. [Figure 8] FIG. 8 is an explanatory diagram of the light distribution of the lighting fixture when the lens in the lens system is in the reference position. [Figure 9] FIG. 9 is an explanatory diagram of the light distribution of the lighting fixture when the lens in the lens system is moved in the negative direction of the Z axis from the reference position. [Figure 10] FIG. 10 is an explanatory diagram of the light distribution of the lighting fixture when the lens in the lens system is moved from the reference position in the negative direction of the Z axis and in the positive direction of the X axis. [Figure 11] FIG. 11 is an explanatory diagram of an illumination area of ​​a lighting fixture equipped with the lens system. [Figure 12] FIG. 12 is an explanatory diagram of an illumination area of ​​a lighting fixture equipped with the lens system. [Figure 13] FIG. 13 is a flowchart showing the operation of the lens system. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Common elements in the embodiments described below are designated by the same reference numerals, and redundant descriptions of the common elements may be omitted. The following embodiments and modifications are merely a portion of the various embodiments of the present disclosure. Various modifications of the following embodiments and modifications can be made depending on the design, etc., as long as the object of the present disclosure can be achieved. The configurations of the modifications can also be combined as appropriate.

[0014] The drawings described in this disclosure are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0015] In this disclosure, "orthogonal (perpendicular)" refers not only to a state where the angle between two things is exactly 90 degrees, but also to a state where two things intersect within a certain range of difference. In other words, the angle between two orthogonal things is within a certain range of difference from 90 degrees (for example, 5 degrees or less). In other words, "orthogonal" in this disclosure includes a case where the angle between two things is 85 degrees or more and 95 degrees or less. Similarly, "parallel" in this disclosure includes not only a case where two things do not strictly intersect, but also a case where two things are lined up within a certain range of difference. For example, "parallel" in this disclosure includes a case where one thing is inclined at an angle of 5 degrees or less relative to the other. In other words, "parallel" in this disclosure includes a case where the angle between one thing and the other is -5 degrees or more and 5 degrees or less.

[0016] (Embodiment) (1) Overview First, an overview of a lens system 100 according to this embodiment and an illumination system 200 including the lens system 100 will be described with reference to FIGS. 1 to 5. Hereinafter, as an example, a Cartesian coordinate system having three mutually orthogonal axes, X, Y, and Z, will be defined. In particular, the axis along the optical axis A11 of the lens 11 (see FIG. 2) will be defined as the "Z-axis," one axis orthogonal to the Z-axis will be defined as the "X-axis," and an axis orthogonal to both the Z-axis and the X-axis will be defined as the "Y-axis." The X-axis, Y-axis, and Z-axis are all imaginary axes, and the arrows indicating "X," "Y," and "Z" in the drawings are merely shown for the purpose of explanation and do not have any physical substance. Furthermore, these directions are not intended to limit the directions in which the lens system 100 is used. The origin of the Cartesian coordinate system can be defined, for example, as the intersection of the light exit surface of the lens 11 and the optical axis A11 of the lens 11.

[0017] The lighting system 200 (see FIG. 5) is used, for example, to illuminate a target space. The target space is, for example, a space within a facility. The facility is, for example, an office building. The facility may also be, for example, a detached house, an apartment building, a store, a museum, a hotel, a factory, a stadium, an airport, etc.

[0018] The lens system 100 includes a lens unit 1, a housing 2, an X-axis actuator 3, a Y-axis actuator 4, and a control unit 10 (see FIG. 5).

[0019] The lens unit 1 includes a lens 11 and a lens holding member 12 that holds the lens 11.

[0020] The housing 2 houses the lens unit 1.

[0021] The X-axis actuator 3 is fixed to the housing 2. The X-axis actuator 3 moves the lens unit 1 in the X-axis direction.

[0022] The Y-axis actuator 4 is fixed to the housing 2. The Y-axis actuator 4 moves the lens unit 1 in the Y-axis direction that is perpendicular to the X-axis direction.

[0023] The control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4. When the control unit 10 moves the lens unit 1 from the first position P1 (see FIG. 7) to the second position P2 (see FIG. 7), the control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4 so that the drive time of the X-axis actuator 3 and the drive time of the Y-axis actuator 4 are the same. Note that "the drive time of the X-axis actuator 3 and the drive time of the Y-axis actuator 4 are the same" does not only mean that the drive times are exactly the same, but also means that the drive times are roughly the same.

[0024] When moving a lens in a direction intersecting both the X-axis and Y-axis directions, the distance the lens moves in the X-axis direction may differ from the distance it moves in the Y-axis direction. For example, when the speed of movement in the X-axis direction and the speed of movement in the Y-axis direction are the same, the time it takes to move in the X-axis direction and the Y-axis direction may differ, and after the lens has completed moving in one of the X-axis direction and the Y-axis direction, it may move further in the other of the X-axis direction and the Y-axis direction. In such cases, the trajectory of the light (or the lens) may become non-linear, which may cause discomfort to a person viewing the light.

[0025] According to lens system 100 of this embodiment, the movement of lens unit 1 in the X-axis direction and the movement of lens unit 1 in the Y-axis direction are completed approximately simultaneously by controlling X-axis actuator 3 and Y-axis actuator 4 so that the drive time of X-axis actuator 3 and the drive time of Y-axis actuator 4 are the same. This makes trajectory TR1 (see FIG. 7) of lens unit 1 linear, reducing the possibility of causing discomfort to a person viewing light L1.

[0026] (2)Details (2.1) Lens system The lens system 100 according to this embodiment will be described in more detail below with reference to FIGS.

[0027] (2.1.1) Lens unit As shown in FIG. 1, the lens unit 1 includes a lens 11 and a lens holding member 12 that holds the lens 11.

[0028] The lens 11 is, for example, a condenser lens. The lens 11 condenses light emitted from, for example, a light source 201 (see FIG. 5) of an illumination system 200 (see FIG. 5). The lens 11 is, for example, a biconvex lens (see FIG. 2).

[0029] The lens 11 has a lens portion 110 having a first surface 111 (see Figure 2) which is a light incident surface and a second surface 112 which is a light exit surface, and multiple (e.g., four) flange portions 113 which protrude from the lens portion 110 in the lens radial direction.

[0030] In a plan view, the outer edge 120 of the lens holding member 12 is, for example, circular. "In a plan view" has the same meaning as "when viewed from below the lens 11 in a direction along the optical axis A11 of the lens 11." In other words, "in a plan view" has the same meaning as "when viewed from below the lens 11 in the thickness direction of the lens 11."

[0031] The lens holding member 12 has a window hole 123 that exposes the first surface 111 and the second surface 112 of the lens 11. The opening shape of the window hole 123 is, for example, circular, but is not limited to this and may be, for example, elliptical. The lens holding member 12 has a first surface 121 and a second surface 122. The first surface 121 of the lens holding member 12 is located on the side of the first surface 111 of the lens 11, and the second surface 122 is located on the side of the second surface 112 of the lens 11. The lens holding member 12 also has a light-blocking property against visible light.

[0032] (2.1.2) Housing As shown in FIG. 2, the housing 2 houses the lens unit 1. The housing 2 has a bottom plate portion 21, a tubular portion 22, and a flange portion 23. The bottom plate portion 21 is flat. The tubular portion 22 protrudes from the periphery of one surface of the bottom plate portion 21 in the thickness direction of the bottom plate portion 21, and surrounds the lens unit 1. In the housing 2, for example, the bottom plate portion 21, the tubular portion 22, and the flange portion 23 are integrally formed. The shape of the housing 2 is a cylinder with a bottom. In a plan view, the outer edge of the housing 2 is circular.

[0033] The material of the housing 2 is, for example, aluminum, but is not limited to this and may be, for example, an aluminum alloy, stainless steel, or synthetic resin.

[0034] (2.1.3) X-axis actuator 1, the X-axis actuator 3 is fixed to the housing 2 and moves the lens unit 1 in the X-axis direction. "Moving the lens unit 1 in the X-axis direction" means moving the lens unit 1 in the positive or negative direction of the X-axis.

[0035] The X-axis actuator 3 is an electric actuator. More specifically, the X-axis actuator 3 has a first stepping motor 31, a first shaft coupling, and a first feed screw mechanism 32. The first feed screw mechanism 32 has a function of converting the rotational motion of the first stepping motor 31 into linear motion.

[0036] The first feed screw mechanism 32 is connected to the rotation shaft of the first stepping motor 31. The first stepping motor 31 is controlled by the control unit 10 (see FIG. 5). The first stepping motor 31 is connected to a plurality of first electric wires, and is connected to the control unit 10 by the plurality of first electric wires, etc.

[0037] The first feed screw mechanism 32 includes, for example, a first screw shaft 321, a first nut 322, a first guide shaft 323, and a first holding member 324. In the first feed screw mechanism 32, the first nut 322 moves linearly as the first screw shaft 321 rotates. The first feed screw mechanism 32 is, for example, a ball screw mechanism, and has rollable steel balls interposed between the screw groove of the first nut 322 and the first screw shaft 321.

[0038] The first screw shaft 321 is connected to the rotation shaft of the first stepping motor 31 by a first shaft coupling.

[0039] The first holding member 324 includes a central piece 3240, a first holding piece 3241, and a second holding piece 3242. The central piece 3240 has a generally rectangular shape with its longitudinal direction aligned with the axial direction of the first screw shaft 321. The first holding piece 3241 protrudes in the thickness direction of the central piece 3240 from a first longitudinal end of the central piece 3240. The second holding piece 3242 protrudes in the same direction as the first holding piece 3241 from a second longitudinal end of the central piece 3240. The first holding piece 3241 includes a first bearing that rotatably holds a first end of the first screw shaft 321. The second holding piece 3242 includes a second bearing that rotatably holds a second end of the first screw shaft 321.

[0040] The first guide shaft 323 is in the shape of a round bar, and is disposed between the first holding piece 3241 and the second holding piece 3242 so as to be parallel to the first screw shaft 321.

[0041] In the X-axis actuator 3, the first holding member 324 is fixed to the housing 2.

[0042] (2.1.4) Y-axis actuator 1, the Y-axis actuator 4 is fixed to the housing 2 and moves the lens unit 1 in the Y-axis direction. "Moving the lens unit 1 in the Y-axis direction" means moving the lens unit 1 in the positive or negative direction of the Y-axis.

[0043] The Y-axis actuator 4 is an electric actuator. More specifically, the Y-axis actuator 4 has a second stepping motor 41, a second shaft coupling, and a second feed screw mechanism 42. The second feed screw mechanism 42 has a function of converting the rotational motion of the second stepping motor 41 into linear motion.

[0044] The second feed screw mechanism 42 is connected to the rotation shaft of the second stepping motor 41. The second stepping motor 41 is controlled by the control unit 10. The second stepping motor 41 is connected to a plurality of second electric wires, and is connected to the control unit 10 by the plurality of second electric wires, etc.

[0045] The second feed screw mechanism 42 includes, for example, a second screw shaft 421, a second nut 422, a second guide shaft 423, and a second holding member 424. In the second feed screw mechanism 42, the second nut 422 moves linearly as the second screw shaft 421 rotates. The second feed screw mechanism 42 is, for example, a ball screw mechanism, and has rollable steel balls interposed between the screw groove of the second nut 422 and the second screw shaft 421.

[0046] The second screw shaft 421 is connected to the rotation shaft of the second stepping motor 41 by a second shaft coupling.

[0047] The second holding member 424 includes a central piece 4240, a first holding piece 4241, and a second holding piece 4242. The central piece 4240 has a generally rectangular shape with its longitudinal direction aligned with the axial direction of the second screw shaft 421. The first holding piece 4241 protrudes in the thickness direction of the central piece 4240 from a first longitudinal end of the central piece 4240. The second holding piece 4242 protrudes in the same direction as the first holding piece 4241 from a second longitudinal end of the central piece 4240. The first holding piece 4241 includes a first bearing that rotatably holds the first end of the second screw shaft 421. The second holding piece 4242 includes a second bearing that rotatably holds the second end of the second screw shaft 421.

[0048] The second guide shaft 423 is in the form of a round bar, and is disposed between the first holding piece 4241 and the second holding piece 4242 so as to be parallel to the second screw shaft 421.

[0049] In the Y-axis actuator 4, the second holding member 424 is fixed to the housing 2.

[0050] (2.1.5) Z-axis actuator 1, the Z-axis actuator 5 is fixed to the housing 2 and moves the lens unit 1 in the Z-axis direction. "Moving the lens unit 1 in the Z-axis direction" means moving the lens unit 1 in the positive or negative direction of the Z axis.

[0051] The Z-axis actuator 5 is an electric actuator. More specifically, the Z-axis actuator 5 has a third stepping motor 51, a third shaft coupling, and a third feed screw mechanism 52. The third feed screw mechanism 52 has a function of converting the rotational motion of the third stepping motor 51 into linear motion.

[0052] The third feed screw mechanism 52 is connected to the rotation shaft of a third stepping motor 51. The third stepping motor 51 is controlled by the control unit 10. The third stepping motor 51 is connected to a plurality of third electric wires, and is connected to the control unit 10 by the plurality of third electric wires, etc.

[0053] 3, the third feed screw mechanism 52 includes, for example, a third screw shaft 521, a third nut 522, a third guide shaft 523, and a third holding member 524. In the third feed screw mechanism 52, the third nut 522 moves linearly as the third screw shaft 521 rotates. The third feed screw mechanism 52 is, for example, a ball screw mechanism, and has rollable steel balls interposed between the screw groove of the third nut 522 and the third screw shaft 521.

[0054] The third screw shaft 521 is connected to the rotation shaft of the third stepping motor 51 by a third shaft coupling.

[0055] The third holding member 524 includes a central piece 5240, a first holding piece 5241, and a second holding piece 5242. The central piece 5240 has a generally rectangular shape with its longitudinal direction aligned with the axial direction of the third screw shaft 521. The first holding piece 5241 protrudes in the thickness direction of the central piece 5240 from a first longitudinal end of the central piece 5240. The second holding piece 5242 protrudes in the same direction as the first holding piece 5241 from a second longitudinal end of the central piece 5240. The first holding piece 5241 includes a first bearing that rotatably holds a first end of the third screw shaft 521. The second holding piece 5242 includes a second bearing that rotatably holds a second end of the third screw shaft 521.

[0056] The third guide shaft 523 is in the form of a round bar, and is disposed between the first holding piece 5241 and the second holding piece 5242 so as to be parallel to the third screw shaft 521.

[0057] In the Z-axis actuator 5, the third holding member 524 is fixed to the housing 2.

[0058] (2.1.6) X-axis play mechanism As shown in FIGS. 1 and 2, the X-axis play mechanism 6 is provided between the lens unit 1 and the X-axis actuator 3. More specifically, the X-axis play mechanism 6 is connected to the lens unit 1 and to the X-axis actuator 3 via a first connecting plate 91. The X-axis play mechanism 6 is connected to a rectangular parallelepiped mounting portion 16 fixed to the first surface 121 of the lens holding member 12. The X-axis play mechanism 6 has a first slider 61 that is slidable in the Y-axis direction and a second slider 62 that is slidable in the Z-axis direction. "Slidable in the Y-axis direction" means that it is slidable in the positive and negative directions of the Y-axis. "Slidable in the Z-axis direction" means that it is slidable in the positive and negative directions of the Z-axis. The X-axis play mechanism 6 also has a first slide guide 63 and a second slide guide 64. The first slide guide 63 holds the first slider 61 so that it can slide freely in the Y-axis direction. Here, the X-axis play mechanism 6 has a first steel ball interposed between the first slider 61 and the first slide guide 63. In short, the X-axis play mechanism 6 has a first ball slide guide mechanism including the first slider 61, the first slide guide 63, and the first steel ball. The second slide guide 64 holds the second slider 62 so that it can slide freely in the Z-axis direction. Here, the X-axis play mechanism 6 has a second steel ball interposed between the second slider 62 and the second slide guide 64. In short, the X-axis play mechanism 6 has a second ball slide guide mechanism including the second slider 62, the second slide guide 64, and the second steel ball. The X-axis play mechanism 6 is, for example, formed by coupling the first slide guide 63 and the second slider 62. In the X-axis play mechanism 6, the first slider 61 is fixed to the lens unit 1, and the second slide guide 64 is fixed to the first nut 322 of the X-axis actuator 3 via a first connecting plate 91.

[0059] Lens system 100 of this embodiment includes X-axis play mechanism 6, which can prevent X-axis actuator 3 from being moved along when lens unit 1 is moved in the Y-axis direction by Y-axis actuator 4, and can also prevent X-axis actuator 3 from being moved along when lens unit 1 is moved in the Z-axis direction by Z-axis actuator 5. This makes it possible for lens system 100 to prevent bending, breaking, etc. of the first electric wire connected to X-axis actuator 3.

[0060] (2.1.7) Y-axis play mechanism As shown in FIGS. 1 and 2, the Y-axis play mechanism 7 is provided between the lens unit 1 and the Y-axis actuator 4. More specifically, the Y-axis play mechanism 7 is connected to the lens unit 1 and to the Y-axis actuator 4 via a second connecting plate 92. The Y-axis play mechanism 7 is connected to a rectangular parallelepiped second mounting portion 17 fixed to the first surface 121 of the lens holding member 12. The Y-axis play mechanism 7 includes a third slider 71 that is slidable in the X-axis direction and a fourth slider 72 that is slidable in the Z-axis direction. "Slidable in the X-axis direction" means that the sliders are slidable in the positive and negative directions of the X-axis. The Y-axis play mechanism 7 also includes a third slide guide 73 and a fourth slide guide 74. The third slide guide 73 holds the third slider 71 so that it can slide in the X-axis direction. Here, the Y-axis play mechanism 7 has a third steel ball interposed between the third slider 71 and the third slide guide 73. In short, the Y-axis play mechanism 7 has a third ball slide guide mechanism including the third slider 71, the third slide guide 73, and the third steel ball. The fourth slide guide 74 holds the fourth slider 72 so that it can slide freely in the Z-axis direction. Here, the Y-axis play mechanism 7 has a fourth steel ball interposed between the fourth slider 72 and the fourth slide guide 74. In short, the Y-axis play mechanism 7 has a fourth ball slide guide mechanism including the fourth slider 72, the fourth slide guide 74, and the fourth steel ball. The Y-axis play mechanism 7 is, for example, formed by coupling the third slide guide 73 and the fourth slider 72. In the Y-axis play mechanism 7, the third slider 71 is fixed to the lens unit 1, and the fourth slide guide 74 is fixed to the second nut 422 of the Y-axis actuator 4 via the second connecting plate 92.

[0061] In the lens system 100 of this embodiment, the lens system 100 is provided with the Y-axis play mechanism 7, which can prevent the Y-axis actuator 4 from being moved along when the lens unit 1 is moved in the X-axis direction by the X-axis actuator 3, and can also prevent the Y-axis actuator 4 from being moved along when the lens unit 1 is moved in the Z-axis direction by the Z-axis actuator 5. This makes it possible for the lens system 100 to prevent bending, breaking, etc. of the second electric wire connected to the Y-axis actuator 4.

[0062] (2.1.8) Z-axis play mechanism As shown in FIGS. 1 and 3, the Z-axis play mechanism 8 is provided between the lens unit 1 and the Z-axis actuator 5. More specifically, the Z-axis play mechanism 8 is connected to the lens unit 1 and to the Z-axis actuator 5 via a third connecting plate 93. The Z-axis play mechanism 8 is connected to a rectangular parallelepiped third mounting portion 18 fixed to the first surface 121 of the lens holding member 12. The Z-axis play mechanism 8 has a fifth slider 81 that is slidable in the X-axis direction and a sixth slider 82 that is slidable in the Y-axis direction. The Z-axis play mechanism 8 also has a fifth slide guide 83 and a sixth slide guide 84. The fifth slide guide 83 holds the fifth slider 81 so that it can slide freely in the X-axis direction. The Z-axis play mechanism 8 has a fifth steel ball interposed between the fifth slider 81 and the fifth slide guide 83. In short, the Z-axis play mechanism 8 has a fifth ball slide guide mechanism including a fifth slider 81, a fifth slide guide 83, and a fifth steel ball. The sixth slide guide 84 holds the sixth slider 82 so that it can slide freely in the Y-axis direction. Here, the Z-axis play mechanism 8 has a sixth steel ball interposed between the sixth slider 82 and the sixth slide guide 84. In short, the Z-axis play mechanism 8 has a sixth ball slide guide mechanism including the sixth slider 82, the sixth slide guide 84, and a sixth steel ball. The Z-axis play mechanism 8 is, for example, formed by coupling the fifth slide guide 83 and the sixth slider 82. In the Z-axis play mechanism 8, the fifth slider 81 is fixed to the lens unit 1, and the sixth slide guide 84 is fixed to the third nut 522 of the Z-axis actuator 5 via the third connecting plate 93.

[0063] Lens system 100 of this embodiment is equipped with Z-axis play mechanism 8, which can prevent Z-axis actuator 5 from being moved along when lens unit 1 is moved in the X-axis direction by X-axis actuator 3, and can also prevent Z-axis actuator 5 from being moved along when lens unit 1 is moved in the Y-axis direction by Y-axis actuator 4. This makes it possible for lens system 100 to prevent bending, breaking, etc. of the third electric wire connected to Z-axis actuator 5.

[0064] As described above, the lens system 100 of this embodiment is provided with the X-axis play mechanism 6, the Y-axis play mechanism 7, and the Z-axis play mechanism 8, thereby making it possible to improve reliability.

[0065] (2.1.9) 1st connecting plate, 2nd connecting plate, 3rd connecting plate The first connecting plate 91 connects the X-axis actuator 3 and the X-axis play mechanism 6. The first connecting plate 91 is, for example, a long plate and has a first end and a second end in the longitudinal direction. The first end of the first connecting plate 91 is fixed to the first nut 322 of the X-axis actuator 3, and the second end of the first connecting plate 91 is fixed to the second slide guide 64 of the X-axis play mechanism 6.

[0066] The second connecting plate 92 connects the Y-axis actuator 4 and the Y-axis play mechanism 7. The second connecting plate 92 is, for example, in the shape of a long plate and has a first end and a second end in the longitudinal direction. The first end of the second connecting plate 92 is fixed to the second nut 422 of the Y-axis actuator 4, and the second end of the second connecting plate 92 is fixed to the fourth slide guide 74 of the Y-axis play mechanism 7.

[0067] The third connecting plate 93 connects the Z-axis actuator 5 and the Z-axis play mechanism 8. The third connecting plate 93 is, for example, in the shape of a long plate and has a first end and a second end in the longitudinal direction. The first end of the third connecting plate 93 is fixed to the third nut 522 of the Z-axis actuator 5, and the second end of the third connecting plate 93 is fixed to the sixth slide guide 84 of the Z-axis play mechanism 8.

[0068] (2.1.10) Control section The control unit 10 controls the X-axis actuator 3, the Y-axis actuator 4, and the Z-axis actuator 5. More specifically, the control unit 10 controls the first stepping motor 31, the second stepping motor 41, and the third stepping motor 51. The control unit 10 controls the first stepping motor 31, the second stepping motor 41, and the third stepping motor 51. The external device 300 is, for example, a remote controller or a human body detector such as an infrared sensor, but is not limited to these.

[0069] The control unit 10 includes a computer system. The computer system is mainly composed of a processor and a memory as hardware. The function of the control unit 10 in the present disclosure is realized by the processor executing a program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided by being recorded on a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuits such as ICs or LSIs referred to here are called by different names depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration). Furthermore, after the LSI is manufactured, the program may be stored in the memory of the computer system. Reconfiguration of the junctions inside FPGA (Field-Programmable Gate Array) or LSI A logic device that can reconfigure the configuration or circuit partitions within an LSI can also be used as a processor. Multiple electronic circuits may be integrated into a single chip or distributed across multiple chips. Multiple chips may be integrated into a single device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, a microcontroller may also be composed of one or more electronic circuits, including a semiconductor integrated circuit or a large-scale integrated circuit.

[0070] As described above, when the lens unit 1 is moved from the first position P1 (see FIG. 7) to the second position P2 (see FIG. 7), the control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4 so that the drive time of the X-axis actuator 3 and the drive time of the Y-axis actuator 4 are the same.

[0071] Here, the first position P1 is the current location of the lens unit, and the second position P2 is the destination (movement completion position) of the lens unit 1 that is determined based on an external signal from the external device 300. The first position P1 and the second position P2 have different positions (coordinates) in the X-axis direction and in the Y-axis direction. In other words, movement of the lens unit 1 from the first position P1 to the second position P2 requires movement in both the X-axis direction and the Y-axis direction. Furthermore, the first position P1 and the second position P2 may have the same position (coordinate) in the Z-axis direction. In other words, the first position P1 and the second position P2 may be located on the XY plane.

[0072] FIG. 6 is an explanatory diagram of the control signals output to the X-axis actuator 3 and the Y-axis actuator 4. In FIG. 6, timing T0 is the control start timing, and timing T1 is the control end timing. For example, as shown in FIG. 7, when the lens unit 1 is moved from a first position P1 to a second position P2, the movement distance of the lens unit 1 in the X-axis direction is longer than the movement distance in the Y-axis direction. In such a case, for example, the control unit 10 controls the X-axis actuator 3 and the Y-axis actuator 4 so that the rotation speed of the second stepping motor 41 of the Y-axis actuator 4 is less than the rotation speed of the first stepping motor 31 of the X-axis actuator 3.

[0073] The control signals output by the control unit 10 to each of the first stepping motor 31 and the second stepping motor 41 are, for example, pulse waves including multiple pulses. The multiple pulses have the same pulse width and are spaced equally apart. The control unit 10 outputs the control signals so that the first pulse included in the control signal output to the first stepping motor 31 and the first pulse included in the control signal output to the second stepping motor 41 are approximately synchronized. The control unit 10 also outputs the control signals so that the last pulse included in the control signal output to the first stepping motor 31 and the last pulse included in the control signal output to the second stepping motor 41 are approximately synchronized. The control unit 10 also outputs the control signals so that the sum of the pulse widths of the multiple pulses included in the control signal output to the first stepping motor 31 is the same as the sum of the pulse widths of the multiple pulses included in the control signal output to the second stepping motor 41.

[0074] Here, the control parameters of the X-axis actuator 3 and the Y-axis actuator 4 are determined by the following formulas (1) and (2). The control parameters are the rotation speed and drive time of the first stepping motor 31 of the X-axis actuator 3, and the rotation speed and drive time of the second stepping motor 41 of the Y-axis actuator 4.

[0075] Tx=Dx / Rx (1) Ty=Dy / Ry (2) In equation (1), "Tx" is the drive time of the first stepping motor 31, "Dx" is the distance in the X-axis direction between the first position P1 and the second position P2, and "Rx" is the rotational speed of the first stepping motor 31. Furthermore, in equation (2), "Ty" is the drive time of the second stepping motor 41, "Dy" is the distance in the Y-axis direction between the first position P1 and the second position P2, and "Ry" is the rotational speed of the second stepping motor 41. Here, the control unit 10 of this embodiment controls the X-axis actuator 3 and the Y-axis actuator 4 so that the drive time of the X-axis actuator 3 and the drive time of the Y-axis actuator 4 are the same, so that Tx = Ty. As a result, the rotational speed of the first stepping motor 31 and the rotational speed of the second stepping motor 41 can be expressed by the following equation (3).

[0076] Ry = (Dy / Dx)Rx (3) 7, when the lens unit 1 is moved from a first position P1 to a second position P2 along a direction intersecting both the X-axis direction and the Y-axis direction, the control unit 10 of this embodiment controls the X-axis actuator 3 and the Y-axis actuator 4 so that the trajectory TR1 of the lens unit 1 becomes linear. This reduces the possibility that the light L1 will cause discomfort to a person viewing it.

[0077] Furthermore, when moving the lens unit 1 from the first position P1 to the second position P2, the control unit 10 of this embodiment controls the X-axis actuator 3 and the Y-axis actuator 4 so that the starting speed and terminal speed of each of the X-axis actuator 3 and the Y-axis actuator 4 are less than the maximum speed of each of the X-axis actuator 3 and the Y-axis actuator 4. In other words, when moving the lens unit 1 from the first position P1 to the second position P2, the control unit 10 controls the X-axis actuator 3 so that the starting speed and terminal speed of the X-axis actuator 3 are less than the maximum speed of the X-axis actuator 3. Furthermore, when moving the lens unit 1 from the first position P1 to the second position P2, the control unit 10 controls the Y-axis actuator 4 so that the starting speed and terminal speed of the Y-axis actuator 4 are less than the maximum speed of the Y-axis actuator 4. This makes the movement of the lens unit 1 smoother, further reducing the possibility of causing discomfort to a person viewing the light L1.

[0078] (2.2) Layout of the X-axis play mechanism, the Y-axis play mechanism, and the Z-axis play mechanism 4, in the lens system 100, the outer edge 120 of the lens holding member 12 is circular in plan view. In plan view, the X-axis play mechanism 6, the Y-axis play mechanism 7, and the Z-axis play mechanism 8 are aligned at equal intervals in the direction along the outer edge 120 of the lens holding member 12.

[0079] 4 shows, in a plan view, a first straight line DX1 passing through the optical axis A2 of the light source 201 and the X-axis play mechanism 6, a second straight line DY1 passing through the optical axis A2 of the light source 201 and the Y-axis play mechanism 7, and a third straight line DZ1 passing through the optical axis A2 of the light source 201 and the Z-axis play mechanism 8. In the example of FIG. 4, the angle θ1 between the third straight line DZ1 and the first straight line DX1 in the clockwise direction is 120 degrees, and the angle θ2 between the third straight line DZ1 and the second straight line DY1 is 240 degrees.

[0080] 4 also shows a square S10 circumscribing the outer edge 120 of the lens holding member 12 in a plan view, indicated by a two-dot chain line. The square S10 has a first side S11, a second side S12, a third side S13, and a fourth side S14, each of which is a tangent to the outer edge 120 of the lens holding member 12. The X-axis play mechanism 6 is arranged so that the longitudinal direction of the first slider 61 is parallel to the first side S11. The Y-axis play mechanism 7 is arranged so that the longitudinal direction of the third slider 71 is parallel to the second side S12. The Z-axis play mechanism 8 is arranged so that the longitudinal direction of the fifth slider 81 (see FIG. 3) is parallel to the fourth side S14, and so that the longitudinal direction of the sixth slider 82 (see FIG. 3) is parallel to the third side S13.

[0081] (2.3) Lighting System The lighting system 200 according to this embodiment will be described in more detail below with reference to FIG.

[0082] The lighting system 200 includes, for example, a light source 201 and a lens system 100. The lighting system 200 further includes a heat sink 202 (see FIGS. 2 and 3), a power supply circuit 203, and a lighting circuit 204. In the lighting system 200, the light source 201 and the heat sink 202 are housed in a housing 2 (see FIG. 1) of the lens system 100. The light source 201 and the heat sink 202 do not move within the housing 2. In the lighting system 200, a circuit module including the power supply circuit 203, the lighting circuit 204, and the control unit 10 is housed in a second housing separate from the housing 2 (first housing). In the lighting system 200, the housing 2 of the lens system 100 also serves as the main body of the lighting fixture 220. The lighting fixture 220 is, for example, a ceiling-embedded lighting fixture, and is attached to the ceiling material with the bottom plate portion 21 and the tube portion 22 of the housing 2 inserted into an embedding hole in the ceiling material and the flange portion 23 of the housing 2 abutting against the underside of the ceiling material.

[0083] Here, the lens system 100 is disposed so that the Z-axis direction is parallel to the optical axis A2 of the light source 201. In the lens system 100, the lens 11 is disposed so that the optical axis A11 of the lens 11 overlaps with the optical axis A2 of the light source 201 when the lens 11 is in the reference position. The light incident surface (first surface 111) of the lens 11 is spaced apart from the light source 201 in the Z-axis direction. Therefore, the illumination system 200 according to this embodiment can achieve improved reliability.

[0084] Furthermore, since the lighting system 200 according to this embodiment includes the lens system 100, it is possible to control the light distribution without changing the position of the light source 201.

[0085] (2.3.1) Light source As shown in FIGS. 1 and 2 , the light source 201 includes, for example, a mounting substrate 210, multiple LED chips mounted on the mounting substrate 210, and a wavelength conversion unit 211 disposed on the mounting substrate 210 and covering the multiple LED chips. Each of the multiple LED chips emits blue light. While the multiple LED chips are connected in series in the light source 201, they may be connected in series-parallel or parallel. The wavelength conversion unit 211 converts blue light into light containing light with wavelengths different from the blue light. The wavelength conversion unit 211 includes, for example, a translucent material and phosphor particles. In this case, the wavelength conversion unit 211 is formed from a mixture of the translucent material and phosphor particles. A large number of phosphor particles are present in the translucent material in the wavelength conversion unit 211. The material of the translucent material (translucent material) is preferably one with high transmittance to visible light. The translucent material is, for example, a silicone-based resin. The "silicone-based resin" is, for example, a silicone resin or a modified silicone resin. The wavelength conversion unit 211 has phosphor particles as a wavelength conversion element. The wavelength conversion element converts the wavelength of a portion of blue light to emit light with a wavelength different from that of the blue light. For example, yellow phosphor particles that emit yellow light can be used as the phosphor particles. The peak wavelength of the light emitted from the LED chip is, for example, 460 nm. The light (fluorescence) emitted from the yellow phosphor particles preferably has an emission spectrum with a main emission peak wavelength in the wavelength range of, for example, 530 nm to 580 nm. The yellow phosphor particles are, for example, Y3Al5O12 activated with Ce, but are not limited thereto. The light (e.g., white light) emitted from the light source 201 is a mixture of blue light and yellow light.

[0086] Furthermore, the wavelength conversion unit 211 is not limited to including only yellow phosphor particles as wavelength conversion elements, but may include, for example, yellow phosphor particles, yellow-green phosphor particles, green phosphor particles, and red phosphor particles. In other words, the wavelength conversion unit 211 may include multiple types of phosphor particles.

[0087] (2.3.2) Heat sink The heat sink 202 (see FIGS. 2 and 3) is a member for dissipating heat generated by the light source 201. In the lighting system 200, the light source 201 is disposed on the heat sink 202. The material of the heat sink 202 includes, for example, aluminum or an aluminum alloy.

[0088] The heat sink 202 is fixed to the housing 2 .

[0089] (2.3.3) Power supply circuit 5 is configured to convert, for example, AC voltage supplied from an AC power system into DC voltage. The power supply circuit 203 includes, for example, a rectifier circuit that full-wave rectifies the AC voltage and a power factor correction circuit (boost chopper circuit). The power supply circuit 203 supplies the DC voltage to the lighting circuit 204, the control unit 10, etc.

[0090] (2.3.4) Lighting circuit The lighting circuit 204 includes, for example, a constant current circuit (for example, a step-down chopper circuit) that can adjust the magnitude of the DC power supplied to the light source 201.

[0091] For example, when dimming the light source 201 based on an external signal provided from the external device 300, the lighting circuit 204 adjusts the magnitude of the current supplied to the light source 201. If the dimming level (also referred to as dimming rate) when the light source 201 is turned on with a rated current is 100%, the lighting circuit 204 can adjust the dimming rate, for example, in the range of 100% to 0%. When the dimming level is 0%, the light source 201 is turned off.

[0092] (3) Operation of the lens system and lighting system In the lens system 100, the relative position of the lens 11 with respect to the light source 201 can be shifted in the X-axis direction, the Y-axis direction, and the Z-axis direction. As shown in FIG. 8 , when the lens 11 is in a reference position, the light L1 emitted from the lighting fixture 220 is light emitted from the light source 201 and concentrated by the lens 11. When the lens 11 is moved from the reference position in the negative direction of the Z-axis, the light L1 emitted from the lighting fixture 220 is light emitted from the light source 201 and diffused by the lens 11, as shown in FIG. 9 . That is, the luminous intensity distribution angle of the light L1 differs between FIG. 8 and FIG. 9 , and the luminous intensity distribution angle of the light L1 in FIG. 9 is larger than the luminous intensity distribution angle of the light L1 in FIG. 8 . When the lens 11 is moved from the reference position in the negative direction of the Z-axis and the positive direction of the X-axis, the light L1 emitted from the lighting fixture 220 is light emitted from the light source 201 and diffused and has its irradiation direction changed by the lens 11, as shown in FIG. 10 . The irradiation direction of the light L1 is different between FIG. 9 and FIG.

[0093] Furthermore, in a lighting system 200 including the lens system 100, it is possible to control the irradiation direction and luminous intensity distribution angle of light L1 from a light source 201 by using the lens system 100, for example, as shown in Fig. 11 and Fig. 12. The luminous intensity distribution angle of light L1 emitted from a lighting fixture 220 differs between Fig. 11 and Fig. 12. Fig. 12 also shows three types of light L1 emitted from the lighting fixture 220 with different irradiation directions. In Fig. 12, for example, the light L1 emitted from the lighting fixture 220 when the lens 11 is shifted in the positive direction of the X axis and the negative direction of the Y axis while the lighting fixture 220 is emitting light L1 shown by the dotted line in Fig. 12 is shown by a two-dot chain line. In addition, in Figure 12, the light L1 emitted from the lighting device 220 when the lens 11 is shifted in the negative direction of the X axis and the negative direction of the Y axis while the lighting device 220 is emitting the light L1 shown by the dotted line is shown by the dashed line.

[0094] FIG. 13 is a flowchart showing the operation of the control unit 10 of the lens system 100.

[0095] First, the control unit 10 receives an external signal from the external device 300 (step S1). The external signal includes information for identifying a first position P1 to which the lens unit 1 is to be moved. Next, the control unit 10 sets a path that linearly connects the first position P1, which is the current location of the lens unit 1, with a second position P2 (step S2). Next, the control unit 10 determines control parameters for the first stepping motor 31 and the second stepping motor 41 (step S3). Then, the control unit 10 controls the motors based on the determined control parameters (step S4). More specifically, the control unit 10 controls the first stepping motor 31 and the second stepping motor 41 by outputting control signals to the first stepping motor 31 and the second stepping motor 41 (step S4).

[0096] It should be noted that the flowchart shown in FIG. 13 is merely an example, and the order of the processes may be changed as appropriate, and processes may be added or deleted as appropriate.

[0097] (4) Variations Modifications of the above embodiment are listed below.

[0098] Functions equivalent to those of the lens system 100 according to the above embodiment may be embodied as a control method, a (computer) program, a non-transitory recording medium having a program recorded thereon, or the like. A control method according to one embodiment is a method for controlling the lens system 100. The lens system 100 includes a lens unit 1, a housing 2, an X-axis actuator 3, and a Y-axis actuator 4. The lens unit 1 includes a lens 11 and a lens holding member 12 that holds the lens 11. The housing 2 houses the lens unit 1. The X-axis actuator 3 is fixed to the housing 2 and moves the lens unit 1 in the X-axis direction. The Y-axis actuator 4 is fixed to the housing 2 and moves the lens unit 1 in the Y-axis direction, which is perpendicular to the X-axis direction. The control method controls the X-axis actuator 3 and the Y-axis actuator 4 so that, when moving the lens unit 1 from a first position P1 to a second position P2, the drive time of the X-axis actuator 3 and the drive time of the Y-axis actuator 4 are the same. A control method according to one embodiment is a method for controlling the lens system 100. The lens system 100 includes a lens unit 1, a housing 2, an X-axis actuator 3, and a Y-axis actuator 4. The lens unit 1 includes a lens 11 and a lens holding member 12 that holds the lens 11. The housing 2 houses the lens unit 1. The X-axis actuator 3 is fixed to the housing 2 and moves the lens unit 1 in the X-axis direction. The Y-axis actuator 4 is fixed to the housing 2 and moves the lens unit 1 in the Y-axis direction that is perpendicular to the X-axis direction. The control method controls the X-axis actuator 3 and the Y-axis actuator 4 so that the trajectory of the lens unit 1 is linear when the lens unit 1 is moved from a first position P1 to a second position P2 along a direction that intersects both the X-axis and Y-axis directions. A program according to one aspect causes one or more processors to execute the above control method.

[0099] The lens system 100 or the control method according to the present disclosure includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the lens system 100 or the control method according to the present disclosure are realized by the processor executing a program stored in the memory of the computer system. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, optical disc, or hard disk drive. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or logic devices capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0100] When the lens unit 1 is being moved along the XY plane, the control unit 10 may control the Z-axis actuator 5 so that the lens unit 1 does not move in the Z-axis direction. Furthermore, the control unit 10 may set the first position P1 and the second position P2 so that the first position P1 and the second position P2 are located on the XY plane.

[0101] Lens system 100 may have a six-degree-of-freedom mechanism, i.e., lens system 100 may further have a function to rotate lens unit 1 (or lens 11) around the X-axis, a function to rotate lens unit 1 around the Y-axis, and a function to rotate lens unit 1 around the Z-axis.

[0102] For example, the lens 11 may be a Fresnel lens. Furthermore, the lens 11 is not limited to a biconvex lens or a Fresnel lens, but may be, for example, a plano-convex lens, a plano-concave lens, a biconcave lens, or the like.

[0103] Furthermore, the outer edge 120 of the lens holding member 12 in plan view is not limited to a circular shape, but may be, for example, an elliptical shape or a polygonal shape.

[0104] Furthermore, in lens system 100, X-axis actuator 3 and X-axis play mechanism 6 may be connected without first connecting plate 91. Furthermore, in lens system 100, Y-axis actuator 4 and Y-axis play mechanism 7 may be connected without second connecting plate 92. Furthermore, in lens system 100, Z-axis actuator 5 and Z-axis play mechanism 8 may be connected without third connecting plate 93.

[0105] Furthermore, the lighting fixture 220 is not limited to a ceiling-embedded lighting fixture, but may be, for example, a ceiling-mounted lighting fixture, a pendant lighting fixture, a spotlight, or the like.

[0106] Furthermore, the lighting system 200 may have a circuit module including the power supply circuit 203, the lighting circuit 204, and the control unit 10 housed in the housing 2.

[0107] (Aspect) As is clear from the above-described embodiment and modified examples, the lens system (100) according to the first aspect includes a lens unit (1), a housing (2), an X-axis actuator (3), a Y-axis actuator (4), and a control unit (10). The lens unit (1) includes a lens (11) and a lens holding member (12) that holds the lens (11). The housing (2) houses the lens unit (1). The X-axis actuator (3) is fixed to the housing (2) and moves the lens unit (1) in the X-axis direction. The Y-axis actuator (4) is fixed to the housing (2) and moves the lens unit (1) in the Y-axis direction that is perpendicular to the X-axis direction. The control unit (10) controls the X-axis actuator (3) and the Y-axis actuator (4). When moving the lens unit (1) from the first position (P1) to the second position (P2), the control unit (10) controls the X-axis actuator (3) and the Y-axis actuator (4) so ​​that the drive time of the X-axis actuator (3) and the drive time of the Y-axis actuator (4) are the same.

[0108] According to this aspect, it is possible to reduce the possibility of causing discomfort to people.

[0109] A lens system (100) according to a second aspect includes a lens unit (1), a housing (2), an X-axis actuator (3), a Y-axis actuator (4), and a control unit (10). The lens unit (1) includes a lens (11) and a lens holding member (12) that holds the lens (11). The housing (2) houses the lens unit (1). The X-axis actuator (3) is fixed to the housing (2) and moves the lens unit (1) in the X-axis direction. The Y-axis actuator (4) is fixed to the housing (2) and moves the lens unit (1) in the Y-axis direction that is perpendicular to the X-axis direction. The control unit (10) controls the X-axis actuator (3) and the Y-axis actuator (4). When the lens unit (1) is moved from a first position (P1) to a second position (P2) along a direction intersecting both the X-axis direction and the Y-axis direction, the control unit (10) controls the X-axis actuator (3) and the Y-axis actuator (4) so ​​that the trajectory of the lens unit (1) becomes linear.

[0110] According to this aspect, it is possible to reduce the possibility of causing discomfort to people.

[0111] In the lens system (100) according to the third aspect, in the first or second aspect, the control unit (10) controls the X-axis actuator (3) and the Y-axis actuator (4) so ​​that the starting speed and terminal speed of each of the X-axis actuator (3) and the Y-axis actuator (4) are less than the maximum speed of each of the X-axis actuator (3) and the Y-axis actuator (4), when moving the lens unit (1) from the first position (P1) to the second position (P2).

[0112] According to this embodiment, the movement of the lens unit (1) can be made smoother, and the possibility of causing discomfort to people can be further reduced.

[0113] The lens system (100) according to a fourth aspect is the lens system (100) of any one of the first to third aspects, further comprising an X-axis play mechanism (6) and a Y-axis play mechanism (7). The X-axis play mechanism (6) has a slider (first slider 61) that is slidable in the Y-axis direction, and is provided between the lens unit (1) and the X-axis actuator (3). The Y-axis play mechanism (7) has a slider (third slider 71) that is slidable in the X-axis direction, and is provided between the lens unit (1) and the Y-axis actuator (4).

[0114] According to this aspect, it is possible to prevent bending, breaking, etc. of the electric wires connected to the X-axis actuator (3) and the Y-axis actuator (4).

[0115] A control method according to a fifth aspect is a control method for a lens system (100). The lens system (100) includes a lens unit (1), a housing (2), an X-axis actuator (3), and a Y-axis actuator (4). The lens unit (1) includes a lens (11) and a lens holding member (12) that holds the lens (11). The housing (2) houses the lens unit (1). The X-axis actuator (3) is fixed to the housing (2) and moves the lens unit (1) in the X-axis direction. The Y-axis actuator (4) is fixed to the housing (2) and moves the lens unit (1) in the Y-axis direction that is perpendicular to the X-axis direction. The control method controls the X-axis actuator (3) and the Y-axis actuator (4) so ​​that, when moving the lens unit (1) from a first position (P1) to a second position (P2), the drive time of the X-axis actuator (3) and the drive time of the Y-axis actuator (4) are the same.

[0116] According to this aspect, it is possible to reduce the possibility of causing discomfort to people.

[0117] A control method according to a sixth aspect is a control method for a lens system (100). The lens system (100) includes a lens unit (1), a housing (2), an X-axis actuator (3), and a Y-axis actuator (4). The lens unit (1) includes a lens (11) and a lens holding member (12) that holds the lens (11). The housing (2) houses the lens unit (1). The X-axis actuator (3) is fixed to the housing (2) and moves the lens unit (1) in the X-axis direction. The Y-axis actuator (4) is fixed to the housing (2) and moves the lens unit (1) in the Y-axis direction that is perpendicular to the X-axis direction. The control method controls the X-axis actuator (3) and the Y-axis actuator (4) so ​​that the trajectory of the lens unit (1) becomes linear when the lens unit (1) is moved from a first position (P1) to a second position (P2) along a direction that intersects both the X-axis and Y-axis directions.

[0118] According to this aspect, it is possible to reduce the possibility of causing discomfort to people.

[0119] A program according to a seventh aspect is a program for causing one or more processors to execute the control method according to the fifth or sixth aspect.

[0120] According to this aspect, it is possible to reduce the possibility of causing discomfort to people. [Explanation of symbols]

[0121] 1 Lens unit 10 Control Unit 11 Lens 12 Lens holding member 2. Case 3 X-axis actuator 4 Y-axis actuator 6 X-axis play mechanism 61 First slider (slider) 7 Y-axis play mechanism 71 Third Slider (Slider) 91 1st connection plate 92 2nd connecting plate 100 Lens System P1 1st position P2 2nd position TR1 locus

Claims

1. a lens unit including a lens and a lens holding member that holds the lens; a housing that houses the lens unit; an X-axis actuator fixed to the housing and configured to move the lens unit in an X-axis direction; a Y-axis actuator fixed to the housing and configured to move the lens unit in a Y-axis direction perpendicular to the X-axis direction; a control unit that controls the X-axis actuator and the Y-axis actuator; Equipped with the control unit controls the X-axis actuator and the Y-axis actuator so that a drive time of the X-axis actuator and a drive time of the Y-axis actuator are the same when moving the lens unit from a first position to a second position. Lens system.

2. a lens unit including a lens and a lens holding member that holds the lens; a housing that houses the lens unit; an X-axis actuator fixed to the housing and configured to move the lens unit in an X-axis direction; a Y-axis actuator fixed to the housing and configured to move the lens unit in a Y-axis direction perpendicular to the X-axis direction; a control unit that controls the X-axis actuator and the Y-axis actuator; Equipped with the control unit controls the X-axis actuator and the Y-axis actuator so that a trajectory of the lens unit becomes linear when the lens unit is moved from a first position to a second position along a direction intersecting both the X-axis direction and the Y-axis direction. Lens system.

3. the control unit controls the X-axis actuator and the Y-axis actuator so that, when the lens unit is moved from the first position to the second position, a starting speed and a terminal speed of each of the X-axis actuator and the Y-axis actuator are less than a maximum speed of each of the X-axis actuator and the Y-axis actuator.

3. A lens system according to claim 1 or 2.

4. an X-axis play mechanism having a slider slidable in the Y-axis direction and provided between the lens unit and the X-axis actuator; a Y-axis play mechanism having a slider slidable in the X-axis direction and provided between the lens unit and the Y-axis actuator; Further comprising:

3. A lens system according to claim 1 or 2.

5. 1. A method for controlling a lens system, comprising: The lens system comprises: a lens unit including a lens and a lens holding member that holds the lens; a housing that houses the lens unit; an X-axis actuator fixed to the housing and configured to move the lens unit in an X-axis direction; a Y-axis actuator fixed to the housing and configured to move the lens unit in a Y-axis direction perpendicular to the X-axis direction; Equipped with when the lens unit is moved from a first position to a second position, the X-axis actuator and the Y-axis actuator are controlled so that a drive time of the X-axis actuator and a drive time of the Y-axis actuator are the same. Control method.

6. 1. A method for controlling a lens system, comprising: The lens system comprises: a lens unit including a lens and a lens holding member that holds the lens; a housing that houses the lens unit; an X-axis actuator fixed to the housing and configured to move the lens unit in an X-axis direction; a Y-axis actuator fixed to the housing and configured to move the lens unit in a Y-axis direction perpendicular to the X-axis direction; Equipped with controlling the X-axis actuator and the Y-axis actuator so that the trajectory of the lens unit becomes linear when the lens unit is moved from a first position to a second position along a direction intersecting both the X-axis direction and the Y-axis direction; Control method.

7. 7. A method for causing one or more processors to execute the control method according to claim 5 or 6, program.

Images