Lens holding device and projection type video display device

Abstract

To improve the positional accuracy of a lens.SOLUTION: A lens holder according to the present disclosure includes a first shifter that holds a lens and is movable in a first direction orthogonal to an optical axis direction of the lens, and a support that supports the first shifter. And a second shift portion that is movable in a second direction orthogonal to the optical axis direction and the first direction, wherein the first shift portion includes a first body portion that is movable in the first direction, a lens holding portion that is provided in the first body portion and holds the lens, and a first drive portion that moves the first body portion, and the lens holding portion is formed integrally with the first body portion.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a lens holding device and a projection-type image display device. [Background technology]

[0002] A projector is disclosed in Patent Document 1. The projector described in Patent Document 1 includes a lens shift mechanism that can move a projection lens in a direction perpendicular to the optical axis direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-14666 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the device described in Patent Document 1 still has room for improvement in terms of improving the positional accuracy of the lens.

[0005] An object of the present disclosure is to provide a lens holding device and a projection-type image display device with improved lens positioning accuracy. [Means for solving the problem]

[0006] A lens holding device according to one embodiment of the present disclosure comprises a first shift section that holds a lens and is movable in a first direction perpendicular to the optical axis direction of the lens, and a second shift section that supports the first shift section and is movable in a second direction perpendicular to the optical axis direction and the first direction, wherein the first shift section has a first main body section that is movable in the first direction, a lens holding section provided on the first main body section that holds the lens, and a first drive section that moves the first main body section, and the lens holding section is formed integrally with the first main body section.

[0007] A projection-type image display device according to one aspect of the present disclosure includes the lens holding device according to the above aspect. [Effects of the Invention]

[0008] The present disclosure can provide a lens holding device and a projection-type image display device with improved lens positioning accuracy. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a projection-type image display device according to a first embodiment. [Figure 2] A diagram showing the projection lens attached to the lens holding device. [Figure 3] FIG. 10 is a diagram showing a state in which the projection lens is removed from the lens holding device. [Figure 4] 1 is a perspective view of a lens holding device according to a first embodiment; [Figure 5] Schematic exploded view of the lens holding device of FIG. [Figure 6] AA line cross-sectional view of the lens holding device of FIG. [Figure 7] BB line cross section of the lens holding device of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of well-known matters or redundant explanations of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0011] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0012] (Embodiment 1) [1-1. Configuration of projection type image display device] Fig. 1 is a block diagram showing a schematic configuration of a projection-type image display device 100 according to the first embodiment. As shown in Fig. 1, the projection-type image display device 100 includes a lens holding device 1, a projection lens 2, an optical unit 3, and a control unit 4. The lens holding device 1, the optical unit 3, and the control unit 4 are housed in a housing 5. The projection-type image display device 100 is a device that projects an image onto a projection target such as a screen or a building.

[0013] The lens holding device 1 is a device that holds the projection lens 2 and moves the projection lens 2. The lens holding device 1 includes a holding mechanism that holds the projection lens 2 and a shift mechanism that moves the projection lens 2. In the lens holding device 1, the holding mechanism and the shift mechanism are configured as an integrated unit.

[0014] Fig. 2 shows a state in which the projection lens 2 is attached to the lens holding device 1, and Fig. 3 shows a state in which the projection lens 2 is removed from the lens holding device 1. To facilitate explanation, Figs. 2 and 3 omit illustration of components of the projection-type image display device 100 other than the lens holding device 1 and the projection lens 2. The X, Y, and Z directions in the figures indicate the horizontal, thickness, and vertical directions of the lens holding device 1, respectively.

[0015] As shown in Figures 2 and 3, the holding mechanism is a mechanism that detachably holds the end side of the projection lens 2. Specifically, the holding mechanism holds the projection lens 2 by engaging with engaging portions 2a provided on the end of the projection lens 2. The holding mechanism also removes the projection lens 2 by releasing the engagement with the engaging portions 2a of the projection lens 2. The engaging portions 2a are, for example, multiple plate-shaped protrusions that protrude outward from the periphery of the projection lens 2. The multiple protrusions are provided at equal intervals around the outer periphery of the projection lens 2.

[0016] The shift mechanism is a mechanism that moves the projection lens 2 while holding the projection lens 2. Specifically, the shift mechanism moves the projection lens 2 in a first direction D1 and a second direction D2 that are perpendicular to the direction in which the optical axis P0 of the projection lens 2 extends (hereinafter referred to as the "optical axis direction"). In this embodiment, the optical axis direction indicates the Y direction, the first direction D1 indicates the X direction (horizontal direction), and the second direction D2 indicates the Z direction (vertical direction).

[0017] The projection lens 2 is a lens that enlarges the image light and projects it onto the projection target. The projection lens 2 has a cylindrical shape with one end and the other end. An engagement portion 2a that detachably engages with the lens holding device 1 is provided on the other end of the projection lens 2.

[0018] The optical unit 3 includes a light source device and a light modulation device. The light source device is, for example, a device that emits light such as a semiconductor laser. The light modulation device is, for example, a liquid crystal display element or a DMD (digital micromirror device).

[0019] The control unit 4 controls the lens holding device 1 and the optical unit 3. The control unit 4 can be realized by a semiconductor element or the like. The control unit 4 can be configured by, for example, a microcomputer, a CPU, an MPU, a GPU, a DSP, an FPGA, or an ASIC. The functions of the control unit 4 may be configured by hardware alone, or may be realized by combining hardware and software. The control unit 4 realizes predetermined functions by reading data and programs stored in a storage unit such as a memory and performing various arithmetic processing.

[0020] [1-2. Configuration of lens holding device] Fig. 4 is a perspective view of the lens holding device 1 of embodiment 1. Fig. 5 is a schematic exploded view of the lens holding device of Fig. 4. Note that Fig. 5 shows the main components of the lens holding device 1, and omits the illustration of some elements.

[0021] 4 and 5, the lens holding device 1 includes a first shift portion 10, a second shift portion 20, and a base portion 30. The first shift portion 10 is fixed to the second shift portion 20, and the second shift portion 20 is fixed to the base portion 30. The lens holding device 1 also includes a through-hole 6 that passes through the first shift portion 10, the second shift portion 20, and the base portion 30. Image light passes through the through-hole 6.

[0022] The first shift unit 10 holds the projection lens 2 and moves in a first direction D1 perpendicular to the optical axis direction of the projection lens 2. The first shift unit 10 is supported by the second shift unit 20 so as to be movable in the first direction D1. The first shift unit 10 has a holding mechanism that holds the projection lens 2 and a shift mechanism that moves in the first direction D1 perpendicular to the optical axis direction of the projection lens 2. The first shift unit 10 integrally configures the holding mechanism and shift mechanism. Specifically, the first shift unit 10 has a first main body unit 11, a lens holding unit 12, a first drive unit 13, and a first shaft 14, and the lens holding unit 12 is provided integrally with the first main body unit 11.

[0023] In this embodiment, the first shaft 14 is fixed to the second shift unit 20 and functions as a guide when the first main body unit 11 moves. That is, the first main body unit 11 is moved along the first shaft 14 by the first drive unit 13.

[0024] The first main body portion 11 and the lens holder 12 are made of, for example, a metal material. That is, the first main body portion 11 and the lens holder 12 are integrally formed from a metal material. The metal material includes, for example, an aluminum alloy or a magnesium alloy. In other words, the first main body portion 11 and the lens holder 12 may be integrally formed from an aluminum alloy. Alternatively, the first main body portion 11 and the lens holder 12 may be integrally formed from a magnesium alloy.

[0025] The first main body 11 is a plate-like member that is movable in the first direction D1. The first main body 11 has, for example, a rectangular shape when viewed from the optical axis direction. Furthermore, a circular first through-hole 6a is provided in the center of the first main body 11 when viewed from the optical axis direction.

[0026] The first main body portion 11 has first shaft holding portions 16 that are arranged along the first direction D1 and that have first shaft holes 15. In this embodiment, the first main body portion 11 has four first shaft holding portions 16. The four first shaft holding portions 16 are provided at both ends of the first main body portion 11 in the vertical direction (Z direction). Specifically, two first shaft holding portions 16 are provided at one end of the first main body portion 11 in the vertical direction (Z direction), and two first shaft holding portions 16 are provided at the other end of the first main body portion 11 in the vertical direction (Z direction).

[0027] The first shaft hole 15 is a circular through-hole when viewed from the first direction D1. The first shaft 14 is inserted into the first shaft hole 15. In this embodiment, a first bearing 16a is disposed in the first shaft hole 15. The first bearing 16a is disposed in the first shaft holder 16 within the first shaft hole 15. The first shaft 14 is inserted into the first bearing 16a.

[0028] The first shaft holding portion 16 is provided to protrude from an end portion in the vertical direction (Z direction) of the first main body portion 11. The first shaft holding portion 16, which is arranged on one end side of the first main body portion 11 in the vertical direction (Z direction) and which is connected to the first driving unit 13, is provided with a first connection portion 16b which is connected to the first driving unit 13. The first connection portion 16b is a plate-shaped member protruding from the first shaft holding portion 16. Furthermore, the two first shaft holding portions 16 arranged on one end side of the first main body portion 11 in the vertical direction (Z direction) are arranged at an interval from each other in the horizontal direction (X direction) of the first main body portion 11.

[0029] The lens holding portion 12 holds the projection lens 2. The lens holding portion 12 holds the projection lens 2 by engaging with an engaging portion 2a provided on the end side of the projection lens 2. The lens holding portion 12 is provided on the first main body portion 11. Specifically, the lens holding portion 12 is provided on an inner wall that defines a first through-hole 6a provided in the first main body portion 11.

[0030] The lens holding portion 12 has a plurality of plate-shaped ribs 12a that protrude from the inner wall of the first through-hole 6a toward the inside of the first main body portion 11. The plurality of ribs 12a are provided at equal intervals when viewed from the optical axis direction. In this embodiment, the plurality of ribs 12a includes three ribs 12a.

[0031] The multiple ribs 12a are provided on the side of the first main body portion 11 where the second shift portion 20 is disposed. Each of the multiple ribs 12a has a contact surface 12b that comes into contact with the projection lens 2. The contact surface 12b is perpendicular to the optical axis direction of the projection lens 2 and comes into contact with the engagement portion 2a of the projection lens 2.

[0032] The lens holder 12 also has a plurality of locking portions 12c. The plurality of locking portions 12c are provided at equal intervals when viewed from the optical axis direction. In this embodiment, the plurality of locking portions 12c includes three locking portions 12c.

[0033] The multiple locking portions 12c lock the engagement portions 2a of the projection lens 2 that are arranged on the contact surfaces 12b of the multiple ribs 12a. In this embodiment, the engagement portions 2a are configured with multiple protrusions. The multiple locking portions 12c lock the multiple protrusions that are arranged on the contact surfaces 12b of the multiple ribs 12a. When attaching the projection lens 2 to the lens holder 12, the engagement portions 2a of the projection lens 2, i.e., the multiple protrusions, are inserted into the first through-holes 6a, and the engagement portions 2a of the projection lens 2 are brought into contact with the contact surfaces 12b of the multiple ribs 12a. Next, by rotating the projection lens 2 around the optical axis, the engagement portions 2a slide over the contact surfaces 12b and engage with the multiple locking portions 12c. As a result, the engagement portions 2a of the projection lens 2, i.e., the multiple protrusions, are engaged and fixed by the multiple locking portions 12c. When removing the projection lens 2, the procedure for attaching the projection lens 2 is reversed.

[0034] The first driving unit 13 moves the first body unit 11 in the first direction D1. The first driving unit 13 has a first actuator 17 that applies a force to the first body unit 11 to move it in the first direction D1.

[0035] The first actuator 17 applies a force to the first body 11 in the first direction D1, thereby moving the first body 11 along the first shaft 14. The first actuator 17 may be, for example, a motor. The first actuator 17 is connected to the first connection portion 16b of the first shaft holder 16 provided on the first body 11. The first actuator 17 applies a force to the first connection portion 16b in the first direction D1. As a result, the first body 11 is guided by the first shaft 14 and moves in the first direction D1. The first actuator 17 is connected to the first connection portion 16b via, for example, a ball screw mechanism or a rotation transmission gear mechanism. The ball screw mechanism is, for example, a mechanism having a screw portion and a nut portion. The rotation transmission gear mechanism is, for example, a mechanism combining multiple gears. The first actuator 17 is controlled, for example, by the control unit 4.

[0036] The first shaft 14 is a cylindrical shaft inserted into the first shaft hole 15 of the first shaft holder 16. The first shaft 14 extends in the first direction D1. The first shaft 14 is inserted into the first bearing 16a and is disposed in the first shaft hole 15 via the first bearing 16a. The first shaft 14 is held by the first shaft holder 16 so as to be slidable in the first bearing 16a. The first shaft 14 is fixed to the second shift unit 20 and functions as a guide for the movement of the first main body unit 11. The first shift unit 10 moves while being guided by the first shaft 14 fixed to the second shift unit 20, and therefore moves in the first direction D1 relative to the second shift unit 20. In other words, even if the first shift unit 10 moves in the first direction D1, the second shift unit 20 does not move in the first direction D1.

[0037] <Second Shift Section> The second shift unit 20 supports the first shift unit 10 and moves in a second direction D2 that is perpendicular to the optical axis direction and the first direction D1. The second shift unit 20 supports the first shift unit 10 so that it can move in the first direction D1. The second shift unit 20 is also supported by the base unit 30 so that it can move in the second direction D2. Therefore, the second shift unit 20 moves in the second direction D2 together with the first shift unit 10 relative to the base unit 30. The second shift unit 20 has a second main body unit 21, a second drive unit 22, and a second shaft 23.

[0038] The second main body portion 21 is a plate-like member that is movable in the second direction D2. The second main body portion 21 has, for example, a rectangular shape when viewed from the optical axis direction. Furthermore, a circular second through-hole 6b is provided in the center of the second main body portion 21 when viewed from the optical axis direction. When viewed from the optical axis direction, the second through-hole 6b is provided at a position that overlaps with the first through-hole 6a and is in communication with the first through-hole 6a.

[0039] The second main body portion 21 has second shaft holding portions 25 that are arranged along the second direction D2 and that are provided with second shaft holes 24. In this embodiment, the second main body portion 21 has four second shaft holding portions 25. The four second shaft holding portions 25 are provided on both ends of the second main body portion 21 in the lateral direction (X direction). Specifically, two second shaft holding portions 25 are provided at one end of the second main body portion 21 in the lateral direction (X direction), and two second shaft holding portions 25 are provided at the other end of the second main body portion 21 in the lateral direction (X direction).

[0040] The second shaft hole 24 is a circular through-hole when viewed from the second direction D2. The second shaft 23 is inserted into the second shaft hole 24. In this embodiment, a second bearing 25a is disposed in the second shaft hole 24. The second bearing 25a is disposed in the second shaft holder 25 within the second shaft hole 24. The second shaft 23 is inserted into the second bearing 25a.

[0041] The second shaft holding portion 25 is provided to protrude from an end portion in the horizontal direction (X direction) of the second main body portion 21. The second shaft holding portion 25, which is arranged on one end side of the second main body portion 21 in the horizontal direction (X direction) and which is connected to the second driving portion 22, is provided with a second connection portion 25b which is connected to the second driving portion 22. The second connection portion 25b is a plate-shaped member protruding from the second shaft holding portion 25. Furthermore, the two second shaft holding portions 25 arranged on one end side of the second main body portion 21 in the horizontal direction (X direction) are arranged at an interval from each other in the vertical direction (Z direction) of the second main body portion 21.

[0042] The second driving unit 22 moves the second main body unit 21 in the second direction D2. The second driving unit 22 has a second actuator 26 that applies a force to move the second main body unit 21 in the second direction D2.

[0043] The second actuator 26 applies a force to the second body portion 21 in the second direction D2, thereby moving the second body portion 21 along the second axis 23. The second actuator 26 may be the same as or different from the first actuator 17. The second actuator 26 is connected to the second connection portion 25b of the second axis holder 25 provided on the second body portion 21. The second actuator 26 applies a force to the second connection portion 25b in the second direction D2. As a result, the second body portion 21 is guided by the second axis 23 and moves in the second direction D2. The second actuator 26 is controlled by, for example, the control unit 4.

[0044] The second shaft 23 is a cylindrical shaft inserted into the second shaft hole 24 of the second shaft holder 25. The second shaft 23 extends in the second direction D2. The second shaft 23 is inserted into the second bearing 25a and disposed in the second shaft hole 24 via the second bearing 25a. The second shaft 23 is held by the second shaft holder 25 so as to be slidable in the second bearing 25a. In this embodiment, the second shaft 23 is fixed to the base 30 and functions as a guide for the movement of the second main body 21. The second shift unit 20 moves while being guided by the second shaft 23 fixed to the base 30, and therefore moves in the second direction D2 relative to the base 30. The first shift unit 10 is fixed to the second main body 21 via the first shaft 14. Therefore, when the second main body 21 moves in the second direction D2, the first shift unit 10 also moves in the second direction D2 together with the second main body 21.

[0045] <Base part> The base portion 30 supports the second shift portion 20. The base portion 30 supports the second shift portion 20 so that the second shift portion 20 can move in the second direction D2. The base portion 30 has a base main body portion 31.

[0046] The base main body 31 is a plate-shaped member. The base main body 31 has, for example, a rectangular shape when viewed from the optical axis direction. Furthermore, a circular third through hole 6c is provided in the center of the base main body 31 when viewed from the optical axis direction. When viewed from the optical axis direction, the third through hole 6c is provided at a position overlapping with the first through hole 6a and the second through hole 6b, and is connected to the first through hole 6a and the second through hole 6b. The first through hole 6a, the second through hole 6b, and the third through hole 6c form the through hole 6 of the lens holding device 1.

[0047] Fig. 6 is a cross-sectional view of the lens holding device 1 taken along line AA in Fig. 4. As shown in Fig. 6, the contact surfaces 12b of the multiple ribs 12a of the lens holding part 12 are disposed in a position close to the axial center C1 of the first shaft 14 in the optical axis direction (Y direction). The axial center C1 of the first shaft 14 means the center of the circular first shaft 14 when viewed from the first direction D1 (X direction).

[0048] Here, a plane that is perpendicular to the optical axis direction when viewed from the first direction D1 (X direction) and that includes the axial center C1 of the first axes 14 is defined as a first imaginary plane PL1. In this embodiment, the first imaginary plane PL1 is an XZ plane that passes through the axial centers C1 of the two first axes 14. A first distance L1 between the first imaginary plane PL1 and the contact surface 12b is smaller than the diameter d1 of the first axes 14. Preferably, the first distance L1 is smaller than ½ the diameter d1 of the first axes 14. More preferably, the first distance L1 is smaller than ⅓ the diameter d1 of the first axes 14. Note that the first distance L1 refers to the distance between the first imaginary plane PL1 and the contact surface 12b in the optical axis direction (Y direction).

[0049] Fig. 7 is a cross-sectional view of the lens holding device 1 taken along line BB in Fig. 4. As shown in Fig. 7, the contact surfaces 12b of the multiple ribs 12a of the lens holding part 12 are disposed in a position close to the axial center C2 of the second shaft 23 in the optical axis direction (Y direction). The axial center C2 of the second shaft 23 means the center of the circular second shaft 23 when viewed from the second direction D2 (Z direction).

[0050] Here, a plane that is perpendicular to the optical axis direction when viewed from the second direction D2 (Z direction) and that includes the axial center C2 of the second axis 23 is defined as a second imaginary plane PL2. In this embodiment, the second imaginary plane PL2 is an XZ plane that passes through the axial centers C2 of the two second axes 23. A second distance L2 between the second imaginary plane PL2 and the contact surface 12b is smaller than twice the diameter d2 of the second axis 23. Preferably, the second distance L2 is smaller than 3 / 2 times the diameter d2 of the second axis 23. More preferably, the second distance L2 is smaller than the diameter d2 of the second axis 23. Note that the second distance L2 refers to the distance between the second imaginary plane PL2 and the contact surface 12b in the optical axis direction (Y direction).

[0051] [1-3.Effects] The lens holding device 1 of the present disclosure includes a first shift unit 10 movable in a first direction D1 and a second shift unit (20) supporting the first shift unit 10 and movable in a second direction D2. The first shift unit 10 includes a first main body unit 11 movable in the first direction D1, a lens holding unit 12 provided on the first main body unit 11 and holding a projection lens 2, and a first drive unit 13 moving the first main body unit 11. The lens holding unit 12 is integrally formed with the first main body unit 11. This configuration improves the positional accuracy of the projection lens 2. Furthermore, the lens holding device 1 of the present disclosure has improved mechanical strength compared to a configuration in which the first main body unit 11 and the lens holding unit 12 are formed as separate members. Furthermore, the number of parts and manufacturing steps can be reduced, thereby reducing manufacturing costs. Furthermore, because the lens holding unit 12 is integrally formed with the first main body unit 11, dimensional accuracy can be improved.

[0052] The first main body 11 and the lens holder 12 are made of a metal material. For example, an aluminum alloy or a magnesium alloy can be used as the metal material. This configuration can further improve the mechanical strength of the lens holder 12 compared to a lens holder made of a resin material. Furthermore, by using a metal material that has a lower thermal expansion coefficient than a resin material, it is possible to improve resistance to environmental factors and / or temperature changes. Furthermore, it is less susceptible to deterioration than a resin material, and it is possible to improve the positional accuracy and focus of the projection lens 2.

[0053] In the lens holding device 1, when viewed from the first direction D1, a first distance L1 between a first imaginary plane PL1 that is perpendicular to the optical axis direction and includes the axial center C1 of the first shaft 14 and the contact surface 12b of the lens holding unit 12 is smaller than the diameter d1 of the first shaft 14. With this configuration, the first shaft 14 can be disposed close to the contact surface 12b of the lens holding unit 12. The contact surface 12b is a surface that contacts and supports the other end face of the projection lens 2. The projection lens 2 is held in a cantilevered state at the other end that contacts the contact surface 12b. The first main body portion 11 of the first shift unit 10 moves while being guided by the first shaft 14. Therefore, by disposing the contact surface 12b that supports the projection lens 2 close to the first shaft 14, the positional accuracy of the projection lens 2 can be improved.

[0054] In the lens holding device 1, when viewed from the second direction D2, the second distance L2 between the contact surface 12b and a second imaginary plane PL2 that is perpendicular to the optical axis direction and includes the axis center C2 of the second axis 23 is smaller than twice the diameter d2 of the second axis 23. With this configuration, the first axis 14 can be disposed close to the contact surface 12b of the lens holding part 12. Since the second main body part 21 of the second shift part 20 moves while being guided by the second axis 23, the positional accuracy of the projection lens 2 can be improved by disposing the contact surface 12b that supports the projection lens 2 close to the second axis 23.

[0055] A projection type image display device equipped with the above lens holding device 1 has the same effects as those of the above lens holding device 1.

[0056] In this embodiment, an example has been described in which the lens holding device 1 holds the projection lens 2, but the present invention is not limited to this. The lens holding device 1 may be a device that holds a lens other than the projection lens 2.

[0057] In this embodiment, an example has been described in which the lens holding device 1 includes the base portion 30, but the present invention is not limited to this. The base portion 30 is not an essential component.

[0058] In the present embodiment, an example has been described in which the first direction D1 in which the first shifter 10 moves is the X direction and the second direction D2 in which the second shifter 20 moves is the Z direction, but this is not limiting. For example, the first direction D1 may be the Z direction and the second direction D2 may be the X direction.

[0059] In this embodiment, an example has been described in which the projection-type image display device 100 includes the lens holding device 1, the projection lens 2, the optical unit 3, and the control unit 4, but the projection-type image display device 100 is not limited to this. The projection-type image display device 100 may include elements other than these elements.

[0060] As described above, the embodiments have been described as examples of the technology of the present disclosure. For this purpose, the accompanying drawings and detailed description have been provided. Therefore, the components described in the accompanying drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the above technology. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately indicating that these non-essential components are essential.

[0061] Furthermore, since the above-described embodiments are intended to illustrate the technology of the present disclosure, various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0062] (Outline of the embodiment) (1) The lens holding device of the present disclosure comprises a first shift section that holds a lens and is movable in a first direction perpendicular to the optical axis direction of the lens, and a second shift section that supports the first shift section and is movable in a second direction perpendicular to the optical axis direction and the first direction, wherein the first shift section has a first main body section that is movable in the first direction, a lens holding section that is provided on the first main body section and holds the lens, and a first drive section that moves the first main body section, and the lens holding section is formed integrally with the first main body section.

[0063] (2) In the lens holding device of (1), the first body portion and the lens holding portion may be made of a metal material.

[0064] (3) In the lens holding device of (2), the metal material may include an aluminum alloy or a magnesium alloy.

[0065] (4) In any one of the lens holding devices (1) to (3), the first shift section has a first axis fixed to the second shift section and guiding the movement of the first main body section, the first main body section has a first axis holding section arranged along the first direction and provided with a first axis hole into which the first axis is inserted, the lens holding section has a contact surface that is perpendicular to the optical axis direction and contacts the lens, the first driving section has a first actuator that applies a force to the first main body section to move it in the first direction, and when viewed from the first direction, a first distance between the contact surface and a first imaginary plane that is perpendicular to the optical axis direction and includes the axis center of the first axis may be smaller than the diameter of the first axis.

[0066] (5) In the lens holding device of (4), the first distance may be smaller than half the diameter of the first shaft.

[0067] (6) In the lens holding device of (4) or (5), the second shifting section may have a second main body section that is movable in the second direction, and a second driving section that moves the second main body section.

[0068] (7) In the lens holding device of (6), the second shift unit has a second axis that guides the movement of the second main body unit, the second main body unit has a second axis holding unit arranged along the second direction and having a second axis hole into which the second axis is inserted, the second drive unit has a second actuator that applies a force to the second main body unit to move it in the second direction, and when viewed from the second direction, the second distance between the contact surface and a second imaginary plane that is perpendicular to the optical axis direction and includes the axis center of the second axis may be smaller than twice the diameter of the second axis.

[0069] (8) The lens holding device of any one of (1) to (7) may further include a base portion that supports the second shift portion.

[0070] (9) The projection-type image display device of the present disclosure includes any one of the lens holding devices (1) to (8). [Industrial Applicability]

[0071] The present disclosure is applicable to a lens holding device that is capable of adjusting the position of a lens, and a projection-type image display device that projects an image. [Explanation of symbols]

[0072] 1 Lens holding device 2 Projection Lens 3 Optical unit 4. Control section 5. Cabinet 6 through holes 6a 1st through hole 6b 2nd through hole 6c 3rd through hole 10 First shift section 11 First main body part 12 Lens holder 12a Rib 12b Contact surface 13 First drive unit 14 1st axis 15 First shaft hole 16 1st axis holding part 16a First bearing 16b First connection part 17 First Actuator 20 Second Shift Section 21 Second main body part 22 Second drive unit 23 2nd axis 24 Second shaft hole 25 2nd axis holding part 25a Second bearing 25b Second connection part 26 Second Actuator 30 Base 31 Base body C1, C2 axis center D1 1st direction D2 2nd direction d1,d2 diameter L1 1st distance L2 2nd distance P0 optical axis PL1 First virtual plane PL2 Second virtual plane 100 Projection type image display device

Claims

1. a first shift unit that holds a lens and is movable in a first direction perpendicular to an optical axis direction of the lens; a second shift unit that supports the first shift unit and is movable in the optical axis direction and a second direction perpendicular to the first direction; Equipped with The first shift unit is a first body portion movable in the first direction; a lens holder provided on the first body portion and holding the lens; a first drive unit that moves the first main body unit; a first shaft that guides the movement of the first main body portion; and the lens holder has a surface that is perpendicular to the optical axis direction and on which the lens is disposed. Lens holding device.

2. a first distance between the surface and a first imaginary plane that is orthogonal to the optical axis direction and includes an axis center of the first axis when viewed from the first direction is smaller than a dimension of the first axis in the optical axis direction; The lens holding device according to claim 1 .

3. the first main body portion has a first through hole that is circular when viewed from the optical axis direction, When viewed from the second direction, a space between an opening of the first through hole on the first direction side and the surface overlaps with the first axis. The lens holding device according to claim 1 .

4. The second shift unit is a second body portion movable in the second direction; a second drive unit that moves the second main body unit; and the second shift portion has a second shaft that guides the movement of the second main body portion, the second main body portion has a second shaft holding portion disposed along the second direction and provided with a second shaft hole into which the second shaft is inserted, the second driving unit has a second actuator that applies a force to move the second main body unit in the second direction, a second distance between the surface and a second imaginary plane that is orthogonal to the optical axis direction and includes an axial center of the second axis when viewed from the second direction is smaller than twice the dimension of the second axis in the optical axis direction; The lens holding device according to claim 1 .

5. A lens holder device according to any one of claims 1 to 4, Projection-type image display device.

6. A first shift unit that holds a lens and is movable in a first direction perpendicular to the optical axis direction of the lens; a second shift unit that supports the first shift unit and is movable in the optical axis direction and a second direction perpendicular to the first direction, The first shift unit is a first body portion movable in the first direction; a lens holder provided on the first body portion and holding the lens; a first drive unit that moves the first main body unit; a first shaft fixed to the second shift portion and guiding the movement of the first body portion; the lens holding portion has a contact surface that is perpendicular to the optical axis direction and that comes into contact with the lens, a first distance between the contact surface and a first imaginary plane that is orthogonal to the optical axis direction and includes an axis center of the first axis when viewed from the first direction is smaller than a dimension of the first axis in the optical axis direction; Lens holding device.

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