Zoom camera and component mounting apparatus

Abstract

To provide a zoom camera whose wear is suppressed.SOLUTION: A zoom camera according to the present disclosure includes a cam that has a cylindrical shape extending in an axial direction and forms a first groove and a second groove, and a lens barrel that has a common optical axis and is housed in the cam such that the optical axis extends in the axial direction. A first lens holder that holds the first movable lens and has a first protrusion protruding from a side surface into the first groove, a second lens holder that holds the second movable lens and has a second protrusion protruding from a side surface into the second groove, a rail that extends in the axial direction inside the cam and with which the first lens holder and the second lens holder are movably engaged, a support portion that supports the rail, and a drive device that rotates the cam relative to the support portion, An axial interval between the first groove and the second groove changes along the circumferential direction.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a zoom camera and a component mounting device having a zoom camera. [Background technology]

[0002] For example, Patent Document 1 discloses a zoom camera for a component mounting device. The zoom camera of Patent Document 1 includes a zoom lens capable of changing the imaging magnification, a camera that captures an image of a component through the zoom lens, and a processing unit.

[0003] In the zoom camera of Patent Document 1, the zoom lens has multiple lenses and a movement mechanism that moves the multiple lenses. The processing unit moves the multiple lenses using the movement mechanism to arbitrarily change the focal length of the lens group within a certain range, thereby adjusting the imaging magnification of the zoom lens. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-116467 Summary of the Invention [Problem to be solved by the invention]

[0005] However, repeated lens movement can cause wear in a zoom camera, and the zoom camera described in Patent Document 1 still has room for improvement in terms of suppressing wear.

[0006] An object of the present disclosure is to solve the above-mentioned problems and to provide a zoom camera with reduced wear. [Means for solving the problem]

[0007] The zoom camera according to the present disclosure comprises a cam having a cylindrical shape extending in the axial direction and forming a first groove and a second groove on its peripheral surface, each of which extends with circumferential and axial components; first and second movable lenses having a common optical axis, housed in the cam so that the optical axis extends in the axial direction, and moving so that their position and spacing in the axial direction changes; a first lens holder that holds the first movable lens and has a first protrusion that protrudes from a side surface into the first groove; a second lens holder that holds the second movable lens and has a second protrusion that protrudes from a side surface into the second groove; a rail that extends in the axial direction inside the cam and with which the first lens holder and the second lens holder are movably engaged; a support portion that supports the rail; and a drive device that rotates the cam relative to the support portion, wherein the axial spacing between the first groove and the second groove changes along the circumferential direction.

[0008] The component mounting device according to the present disclosure includes a mounting head that holds the components, a stage that supports a substrate on which the components are mounted, a zoom camera that is at a constant axial distance to the stage, and a control unit that controls the amount of relative rotation of a cam with respect to a support unit by a drive unit based on information about the components. [Effects of the Invention]

[0009] According to the present disclosure, a zoom camera with reduced wear can be provided. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of a component mounting device according to a first embodiment of the present disclosure. [Figure 2] Zoom camera side view [Figure 3] Perspective view of the camera body [Figure 4] Exploded view of the camera body [Figure 5] Cross section of the camera body [Figure 6] Cross section of the camera body [Figure 7] Cross section of the camera body [Figure 8] Perspective view of the lens holder [Figure 9]Cross section of support tube and rail [Figure 10A] A perspective view of a lens holder and a rail [Figure 10B] A perspective view of a lens holder and a rail DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment 1] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The configurations, shapes, etc. described below are examples for the purpose of explanation and can be modified as appropriate depending on the specifications of the component mounting device. In the following, corresponding elements in all drawings will be given the same reference numerals, and duplicated explanations will be omitted.

[0012] 1 is a front view of a component mounting device 1 according to a first embodiment of the present disclosure, and schematically illustrates a portion of the component mounting device 1. In FIG. 1 and portions described later, an X-axis and a Y-axis are shown as two axes that are orthogonal to each other in a horizontal plane, and a Z-axis (the up-down direction in FIG. 1) is shown as a height direction that is orthogonal to the horizontal plane.

[0013] First, the overall configuration of component mounting apparatus 1 will be described with reference to Fig. 1. As shown in Fig. 1, component mounting apparatus 1 is an apparatus that mounts components 4 on a substrate 6. Component mounting apparatus 1 includes a base 2, a component supply unit 3, a stage 5, a mounting head 7, a zoom camera 8, and a control unit 9.

[0014] The base 2 is a member that supports the component supply unit 3, the stage 5, and the like.

[0015] The component supply unit 3 is configured to supply the components 4. The component supply unit 3 supports, for example, a wafer and supplies the components 4 from the wafer.

[0016] The component 4 is a thin plate-like member, such as a die or an IC chip, and is made of a material such as silicon, gallium nitride, or silicon carbide.

[0017] The stage 5 is configured to support the substrate 6. The stage 5 may be movable along the Y-axis and the Y-axis relative to the base 2 so that the substrate 6 can be aligned with the mounting head 7 and transported after the components 4 are mounted.

[0018] The substrate 6 is a plate-like member and may be circular or rectangular. The substrate 6 is formed from a material such as silicon, glass, stainless steel, or resin. The substrate 6 has a recognition pattern for alignment with the component 4. The recognition pattern may be a mark provided on the surface of the substrate 6 or a surface shape such as an unevenness or a groove.

[0019] The mounting head 7 moves above the stage 5 while holding the component 4, and then descends to mount the component 4 at a predetermined mounting position on the substrate 6. The predetermined mounting position is a position defined by the recognition pattern on the substrate 6.

[0020] The zoom camera 8 is a camera that captures images of the board 6 and the component 4. Specifically, before the component 4 is mounted on the board 6, the zoom camera 8 captures an image of the recognition pattern on the board 6. Based on the image capture result, the control unit 9 can align the stage 5 and the mounting head 7. Furthermore, after the component 4 is mounted on the board 6, the zoom camera 8 captures an image of the component 4 mounted on the board 6. Based on the image capture result, the control unit 9 can inspect the mounting accuracy of the component 4 relative to the specified mounting position. The process of inspecting the mounting accuracy of the component 4 may be referred to as PBI (Post Bond Inspection).

[0021] The imaging magnification of the zoom camera 8 is variable, so that the zoom camera 8 can capture images of components 4 having different sizes and shapes, as well as recognition patterns corresponding to each component 4.

[0022] On the other hand, the zoom camera 8 is spaced a certain distance from the stage 5 in the Z direction. That is, the zoom camera 8 is fixed in the Z direction relative to the stage 5. Note that the zoom camera 8 may be movable in the X and Y directions.

[0023] The control unit 9 is configured to control the component mounting device 1. Specifically, the control unit 9 controls the component supply unit 3, the stage 5, the mounting head 7, the zoom camera 8, etc. The control unit 9 includes a general-purpose processor such as a CPU, MPU, FPGA, DSP, or ASIC that executes a program to realize a predetermined function. The control unit 9 executes a program stored in a memory (not shown) to realize the function.

[0024] The control unit 9 controls the zoom camera 8 based on information stored in the memory or information acquired by other components. For example, the control unit 9 controls the zoom camera 8 based on information about the type of the part 4 that is stored in advance in the memory.

[0025] 2 is a side view of the zoom camera 8. FIG. 2 shows a schematic view of a part of the zoom camera 8.

[0026] As shown in FIG. 2, the zoom camera 8 includes a camera body 10, a fixed lens 11, a drive unit 12, and a belt 13.

[0027] The camera body 10 is a cylindrical member and has two movable lenses 14 and 15 inside. When the camera body 10 is installed on the component mounting device 1, the axial direction L of the camera body 10 is parallel to the Z direction.

[0028] The movable lenses 14, 15 have common optical axes L1, L2, and are housed inside the camera body 10 side by side in the axial direction L, with the optical axes L1, L2 extending in the axial direction L. The movable lenses 14, 15 are movable in the axial direction L. Specifically, the movable lenses 14, 15 are movable so that their respective positions in the axial direction L and the distance between the movable lenses 14, 15 change.

[0029] When the movable lenses 14, 15 are moved in the axial direction L, the focal length of the lens group made up of the movable lenses 14, 15 changes. On the other hand, the focal plane of the lens group does not move. Therefore, when the movable lenses 14, 15 are moved in the axial direction L, the imaging magnification changes without the zoom camera 8 becoming out of focus.

[0030] Fixed lens 11 is a lens fixed to the tip of camera body 10. Fixed lens 11 is located optically downstream of movable lenses 14 and 15. Light for imaging is incident on the top of camera body 10, passes through movable lenses 14 and 15, and is emitted from fixed lens 11, and is irradiated onto component 4 and board 6.

[0031] The camera body 10 and the fixed lens 11 are spaced apart from the stage 5 in the Z direction.

[0032] The driving device 12 is a mechanism that moves the movable lenses 14, 15 inside the camera body 10 in the axial direction L. The driving device 12 is, for example, a motor, and the power of the driving device 12 is transmitted to the camera body 10 via a belt 13.

[0033] Fig. 3 is a perspective view of the camera body 10. Fig. 4 is an exploded view of the camera body 10. Figs. 3 and 4 show a portion of the camera body 10. In Figs. 3 and 4 and in some portions described below, when viewed from the axial direction L, the circumferential direction centered on the axial direction L is referred to as the circumferential direction C, and the direction extending radially from the axial direction L is referred to as the radial direction R.

[0034] 4, the camera body 10 has a cam 21, a support tube 31, lens holders 41 and 42, and rails 61 and 62. Although not shown, the lens holders 41 and 42 house movable lenses 14 and 15.

[0035] The cam 21 is a cylindrical member extending in the axial direction L. Two grooves 22, 23 are formed on the circumferential surface of the cam 21. The grooves 22, 23 extend in a direction having a circumferential component C and an axial component L. The positions of the grooves 22, 23 in the axial direction L change along the circumferential direction C.

[0036] The grooves 22 and 23 have different shapes, and specifically, the size of the components in the axial direction L of the grooves 22 and 23 are different. Therefore, if the distance between the grooves 22 and 23 in the axial direction L is defined as distance D1, the distance D1 changes along the circumferential direction C.

[0037] In the first embodiment, the grooves 22 and 23 penetrate the cam 21, but the present invention is not limited to this.

[0038] The support tube 31 is a cylindrical member that is housed inside the cam 21 and extends in the axial direction L. The support tube 31 has an opening 32 that overlaps with a portion of each of the grooves 22 and 23 of the cam 21. Returning to FIG. 3 , the opening 32 overlaps with the groove 22 at an overlap position Z1, and overlaps with the groove 23 at an overlap position Z2.

[0039] Cam 21 is rotated in circumferential direction C relative to support tube 31 by drive unit 12 (FIG. 2). When cam 21 rotates, the portions of grooves 22, 23 that overlap with opening 32 change, changing the positions in the axial direction L and the distance D1 between grooves 22, 23 in opening 32. As a result, overlapping positions Z1, Z2 each move along the axial direction L within opening 32, changing the distance between overlapping positions Z1, Z2.

[0040] As shown in FIG. 4, the support tube 31 has other openings 33 (FIG. 5) at positions different from the opening 32 in the circumferential direction C.

[0041] In the first embodiment, the fixed lens 11 (FIG. 2) is fixed to the lower end of the support tube 31. That is, the support tube 31 functions as a lens barrel of the zoom camera 8.

[0042] The lens holders 41 and are housed in the support tube 31 side by side in the axial direction L, and are members that move along the axial direction L while holding the movable lenses 14 and 15. The lens holder 41 is disposed above the lens holder .

[0043] FIG. 5 is a cross-sectional view of the camera body 10 taken along the axial direction L. As shown in FIG.

[0044] As shown in FIGS. 4 and 5, the lens holder 41 has a holding portion 43 and a protrusion 45, and the lens holder has a holding portion 44 and a protrusion .

[0045] The holding portion 43 functions as a frame that holds the movable lens 14, and the holding portion 44 functions as a frame that holds the movable lens 15. Specifically, the holding portions 43, 44 communicate with each other in the axial direction L and have through holes in the center that accommodate the movable lenses 14, 15.

[0046] As shown in Fig. 5, the protrusion 45 of the lens holder 41 protrudes outward in the radial direction R from the side surface of the holding portion 43. The protrusion 45 protrudes into the groove 22 of the cam 21 through the opening 32 of the support tube 31. Furthermore, the protrusion 46 of the lens holder 42 protrudes outward in the radial direction R from the side surface of the holding portion 44. The protrusion 46 protrudes into the groove 23 of the cam 21 through the opening 32 of the support tube 31. That is, the protrusions 45 and 46 are located at overlapping positions Z1 and Z2 (Fig. 3), respectively.

[0047] With this configuration, when the cam 21 rotates relative to the support tube 31, the projections 45, 46 move along the axial direction L within the opening 32, changing the overlapping positions Z1, Z2, and the spacing between the projections 45, 46. Therefore, the positions and spacing of the lens holders 41, 42 and the movable lenses 14, 15 in the axial direction L change.

[0048] Cam followers (rotating bodies) that come into contact with the cam 21 are provided at the tips of the protrusions 45 and 46. With this configuration, the protrusions 45 and 46 can move smoothly along the grooves 22 and 23 with low friction.

[0049] 4, lens holder 41 further has engagement portions 47A and 47B that engage with rails 61 and 62, respectively. Lens holder 42 has engagement portions 48A and 48B that engage with rails 61 and 62, respectively. Engagement portions 47A, 47B, 48A, and 48B are provided on holding portions 43 and 44 at positions different from protrusions 45 and 46 in circumferential direction C, respectively.

[0050] The rails 61 and 62 extend in the axial direction L, and engage with the engaging portions 47A, 47B, 48A, and 48B so as to be able to roll and move in the axial direction L. The rails 61 and 62 are supported by the support tube 31. Specifically, the rails 61 and 62 are fixed to the inner circumferential surface of the support tube 31 by screws.

[0051] In the first embodiment, the rails 61, 62 extend parallel to each other at an interval in the circumferential direction C. The rails 61, 62 are arranged at positions spaced apart by an angle of 120° around the center of the support tube 31 so as to sandwich the protrusions 45, 46 in the circumferential direction C.

[0052] In the first embodiment, the rails 61 and 62 are longer than the opening 32 in the axial direction L.

[0053] The structures of the lens holders 41, 42 and the rails 61, 62 will be described in more detail with reference to Figures 6 and 7. Figure 6 is a cross-sectional view of the camera body 10 showing a cross section of the lens holder 41 perpendicular to the axial direction L. Figure 7 is a cross-sectional view of the camera body 10 showing a cross section of the lens holder 42 perpendicular to the axial direction L.

[0054] 6, the outer surface 49 of the holding portion 43 is spaced from the inner circumferential surface 35 of the support tube 31. Specifically, the outer surface 49 of the holding portion 43 is spaced from the inner circumferential surface 35 of the support tube 31 over the entire circumference. That is, at a position different from the protrusion 45, the lens holder 41 is positioned more inward in the radial direction R than the inner circumferential surface 35 of the support tube 31, and is spaced apart from the inner circumferential surface 35. Because the support tube 31 is disposed inside the cam 21, the outer surface 49 of the holding portion 43 is also spaced from the inner circumferential surface 35 of the cam 21.

[0055] In the first embodiment, the outer surface 49 of the holding portion 43 has a plurality of flat side surfaces 71, 72, 73, and 74.

[0056] The side surfaces 71, 72 are disposed at positions spaced apart by an angle of 120° around the center of the retaining portion 43 so as to face the rails 61, 62. Engagement portions 47A, 47B that protrude toward the inner circumferential surface 35 are provided on the side surfaces 71, 72, respectively, and are fastened with screws. The engagement portions 47A, 47B are spaced apart from the inner circumferential surface 35 in the radial direction R.

[0057] A side surface 73 is located between the side surfaces 71 and 72. A protrusion 45 that protrudes into the groove 22 of the cam 21 is provided on the side surface 73. That is, the engagement portions 47A and 47B are arranged to sandwich the protrusion 45 in the circumferential direction C. The side surface 73 has an area smaller than each of the side surfaces 71 and 72.

[0058] A side surface 74 is located on the opposite side of the side surface 73 in the radial direction R. In the radial direction R, the maximum distances G1, G2 between the side surfaces 71, 72 and the inner circumferential surface 35 are greater than the maximum distance G4 between the side surface 74 and the inner circumferential surface 35.

[0059] 7, like the outer surface 49 of the holding portion 43, the outer surface 50 of the holding portion 44 is spaced from the inner circumferential surface 35 of the support tube 31 along its entire circumference and has a plurality of planar side surfaces 81, 82, 83, and 84. The side surfaces 81, 82, 83, and 84 have the same configuration as the side surfaces 71, 72, 73, and 74 of the lens holder 41, respectively. That is, the side surfaces 81 and 82 are provided with engagement portions 48A and 48B, and the side surface 83 is provided with a protrusion 45. The maximum distances H1 and H2 between the side surfaces 81 and 82 and the inner circumferential surface 35 are greater than the maximum distance H4 between the side surface 84 and the inner circumferential surface 35.

[0060] 6 and 7, rails 61, 62 protrude inward from inner circumferential surface 35. Rail grooves 37, 38 are provided on inner circumferential surface 35 of support tube 31, recessed outward in radial direction R and extending in axial direction L. Rail 61 is disposed in rail groove 37, and rail 62 is disposed in rail groove 38. This configuration allows for more efficient use of the space within support tube 31. It also makes it possible to avoid interference between inner circumferential surface 35 and engaging portions 47A, 47B and engaging portions 48A, 48B.

[0061] FIG. 8 is a perspective view of the lens holder 41. As shown in FIG.

[0062] 8, the engagement portions 47A and 47B of the lens holder 41 have recesses 75 and 76, respectively, with which the rails 61 and 62 engage. The engagement portions 47A and 47B protrude upward beyond the upper end of the holding portion 43. This allows the length of the portions of the rails 61 and 62 that engage with the recesses 75 and 76 to be increased, making it easier to stably move the lens holder 41. Although not shown, the engagement portions 48A and 48B of the lens holder 42 may protrude downward beyond the lower end of the holding portion 44.

[0063] FIG. 9 is a cross-sectional view of the support tube 31 and the rails 61 and 62, showing the XY cross section.

[0064] 9, opening 33 in support tube 31 faces rail 61 fixed to inner circumferential surface 35. Opening 34 faces rail 62 fixed to inner circumferential surface 35. With this configuration, when assembling camera body 10, rails 61 and 62 can be fastened with screws via openings 33 and 34, making assembly of camera body 10 easier.

[0065] The operation of the camera body 10 will be described with reference to Figures 10A and 10B. Figures 10A and 10B are perspective views of the lens holders 41, 42 and the rails 61, 62 when the lens holders 41, 42 are in different positions.

[0066] An example of the operation of mounting the component 4 on the board 6 will be described below, but the operation is not limited to this. The component mounting device 1 may also perform an operation of mounting a component 4 on another component 4.

[0067] First, the control unit 9 (FIG. 1) acquires information about the component 4 to be next mounted on the board 6. Specifically, the control unit 9 acquires the information about the component 4 by referring to the memory. The information about the component 4 includes, for example, information about the type of component 4, the size of the component 4, the shape of the component 4, and the mounting position of the component 4. The information about the component 4 is stored in the memory before the start of operation, for example, based on a production plan.

[0068] Next, based on the acquired information about the component 4, the control unit 9 causes the mounting head 7 to hold the component 4 and moves the mounting head 7 to above the mounting position.

[0069] Next, the control unit 9 uses the zoom camera 8 to capture an image of the recognition pattern on the substrate 6. Specifically, the control unit 9 determines the amount of rotation of the cam 21 relative to the support tube 31 based on the acquired information about the component 4. In accordance with the determined amount of rotation, the control unit 9 controls the drive device 12 to rotate the cam 21. As shown in FIGS. 10A and 10B , the rotation of the cam 21 causes the protrusions 45 and 46 to move in the axial direction L, i.e., the movable lenses 14 and 15 also move in the axial direction L. As a result, the imaging magnification of the zoom camera 8 can be changed.

[0070] Next, the control unit 9 moves the stage 5 based on the imaging result to align the substrate 6 with the component 4.

[0071] Next, the control unit 9 lowers the mounting head 7 to mount the component 4 on the board 6.

[0072] Next, the control unit 9 uses the zoom camera 8 to capture an image of the mounted component 4. Specifically, the control unit 9 determines the amount of rotation of the cam 21 relative to the support tube 31 based on the acquired information about the component 4, and controls the drive device 12 to rotate the cam 21, thereby changing the imaging magnification of the zoom camera 8. The amount of rotation of the cam 21 when capturing an image of the mounted component 4 may be the same as or different from the amount of rotation of the cam 21 when capturing an image of the recognition pattern on the board 6.

[0073] Next, the control unit 9 determines whether or not the mounting accuracy of the components 4 satisfies a predetermined condition based on the imaging result. If the control unit 9 determines that the mounting accuracy of the components 4 does not satisfy the predetermined condition, the board 6 may be discarded.

[0074] (effect) The zoom camera 8 and the component mounting device 1 according to the first embodiment can provide the following effects.

[0075] Zoom camera 8 of embodiment 1 includes cam 21, movable lenses 14 and 15 (first and second movable lenses), lens holder 41 (first lens holder), lens holder 42 (second lens holder), rails 61 and 62, and support tube 31 (support portion). Cam 21 has a cylindrical shape extending in axial direction L, and has groove 22 (first groove) and groove 23 (second groove) formed on its circumferential surface, each extending with components in circumferential direction C and axial direction L. Movable lenses 14 and 15 have common optical axes L1 and L2, are housed in cam 21, and move such that their positions and spacing in axial direction L change. Lens holder 41 holds movable lens 14 and has a protrusion 45 (first protrusion) protruding from its side into groove 22. Lens holder 42 holds movable lens 15 and has a protrusion 46 (second protrusion) that protrudes from its side surface into groove 23. Rails 61, 62 extend in axial direction L inside cam 21, and lens holders 41, 42 are movably engaged with rails 61, 62. Support tube 31 supports rails 61, 62. Zoom camera 8 further includes a drive unit 12 that rotates cam 21 relative to support tube 31. A distance D1 between groove 22 and groove 23 in axial direction L varies along the circumferential direction C.

[0076] With this configuration, the provision of rails 61, 62 enables the lens holders 41, 42 to roll, which reduces wear between the lens holders 41, 42 and other members compared to when the lens holders 41, 42 slide relative to other members, thereby extending the life of the zoom camera 8.

[0077] In zoom camera 8 of the first embodiment, rails 61 and 62 engage with lens holders 41 and 42 with the side surfaces of lens holder 41 and 42 spaced apart from inner circumferential surface 25 of cam 21 and support tube 31, respectively.

[0078] With this configuration, rails 61, 62 are provided to provide a gap between lens holders 41, 42 and other members, thereby further reducing wear between lens holders 41, 42 and other members, and thus further extending the life of zoom camera 8.

[0079] In zoom camera 8 of embodiment 1, lens holder 41 has engagement portions 47A and 47B (first engagement portions) that engage with rails 61 and 62 at positions in circumferential direction C that are different from protrusion 45. Lens holder 42 has engagement portions 48A and 48B (second engagement portions) that engage with rails 61 and 62 at positions in circumferential direction C that are different from protrusion 46.

[0080] With this configuration, by providing the engagement portions 47A, 47B, 48A, and 48B at positions that avoid the protrusions 45 and 46, it becomes easy to provide the engagement portions 47A, 47B, 48A, and 48B on the lens holders 41 and 42.

[0081] In the zoom camera 8 of the first embodiment, the support tube 31 has a cylindrical shape with the fixed lens 11 fixed to the tip.

[0082] With this configuration, the support tube 31 can function as a lens barrel.

[0083] In the zoom camera 8 of the first embodiment, rail grooves 37, 38 extending in the axial direction L are provided on the inner peripheral surface 35 of the support tube 31, and the rails 61, 62 are arranged in the rail grooves 37, 38.

[0084] With this configuration, it is easier to secure a larger space inside the support tube 31 compared to when the rail grooves 37, 38 are not present, and it is easier to provide the rails 61, 62 on the support tube 31 while maintaining the radial dimension R of the lens holders 41, 42.

[0085] In the zoom camera 8 of the first embodiment, the support tube 31 has openings 33 and 34 at positions facing the rails 61 and 62.

[0086] This configuration makes it easy to attach the rails 61 and 62 to the support tube 31.

[0087] In zoom camera 8 of embodiment 1, lens holder 41 has planar side surfaces 71 and 72 (first side surfaces) facing rails 61 and 62. Lens holder 42 has planar side surfaces 81 and 82 (second side surfaces) facing rails 61 and 62. Engagement portions 47A and 47B are provided on side surfaces 71 and 72, and engagement portions 48A and 48B are provided on side surfaces 81 and 82.

[0088] With this configuration, it becomes easy to provide the engagement portions 47A, 47B, 48A, and 48B on the side surfaces 71, 72, 81, and .

[0089] In zoom camera 8 of embodiment 1, rails 61 and 62 have two rails spaced apart in circumferential direction C and sandwiching protrusions 45 and 46. Engagement portions 47A and 47B and engagement portions 48A and 48B each have two engagement portions that engage with the two rails.

[0090] With this configuration, compared to when a single rail is provided, tilting of the lens holders 41 and 42 can be suppressed and the movement can be more stable. Therefore, interference between the lens holders 41 and 42 and other components is suppressed, and the movement accuracy of the lens holders 41 and 42 is improved.

[0091] In the zoom camera 8 of the first embodiment, the lens holder 41 has a side surface 73 (third side surface) on which the protrusion 45 is provided, and a side surface 74 (fourth side surface) opposite the side surface 73. When viewed from the axial direction L, the distances G1 and G2 between the inner circumferential surface 35 of the support tube 31 and the side surfaces 71 and 72 are larger than the distance G4 between the inner circumferential surface 35 of the support tube 31 and the side surface 74. The lens holder 42 has a side surface 83 (fifth side surface) on which the protrusion 46 is provided, and a side surface 84 (sixth side surface) opposite the side surface 83. When viewed from the axial direction L, the distances H1 and H2 between the inner circumferential surface 35 of the support tube 31 and the side surfaces 81 and 82 are larger than the distance H4 between the inner circumferential surface 35 of the support tube 31 and the side surface 84.

[0092] With this configuration, there is space for providing the engagement portions 47A, 47B, 48A, and 48B on the side surfaces 71, 72, 81, and .

[0093] In zoom camera 8 of the first embodiment, side surface 71 has a larger area than side surface 73 , and side surface 81 has a larger area than side surface 83 .

[0094] With this configuration, there is space for providing the engagement portions 47A, 47B, 48A, and 48B on the side surfaces 71, 72, 81, and .

[0095] The component mounting device 1 of the first embodiment includes a mounting head 7 that holds the component 4, a stage 5 that supports a substrate 6 on which the component 4 is to be mounted, a zoom camera 8 that is at a constant distance to the stage 5 along the axial direction L, and a control unit 9. The control unit 9 controls the amount of rotation of the cam 21 relative to the support tube 31 caused by the drive unit 12 based on information about the component 4.

[0096] With this configuration, wear between the lens holders 41 and 42 and other members can be suppressed, and the life of the component mounting device 1 can be extended.

[0097] The present disclosure is not limited to the first embodiment, but can be embodied in various other forms.

[0098] In the first embodiment, an example has been described in which the support tube 31, which is a lens barrel, is used as the support portion, but this is not limiting. The support portion may be any structure that supports the rails 61, 62 inside the cam 21 and allows the protrusions 45, 46 to protrude into the grooves 22, 23, and may be, for example, a frame that supports the ends of the rails 61, 62. In this case, it is sufficient that there is a gap between the outer surfaces 49, 50 of the lens holders 41, 42 and the inner circumferential surfaces of the frame and cam 21. On the other hand, when the support tube 31 is a lens barrel, it becomes easy to arrange the fixed lens 11 and the movable lenses 14, 15 coaxially.

[0099] In the first embodiment, an example in which the cam 21 rotates relative to the support tube 31 has been described, but the present invention is not limited to this. For example, the cam 21 may be fixed, and the support tube 31 may rotate relative to the cam 21. It is sufficient that relative rotation between the cam 21 and the support tube 31 is possible.

[0100] In the first embodiment, an example has been described in which two rails 61, 62 are fixed to the support tube 31, but this is not limiting. One or three or more rails 61, 62 may be fixed to the support tube 31. On the other hand, when two rails 61, 62 are fixed to the support tube 31, the movement accuracy of the lens holders 41, 42 is improved compared to when one rail is used, and the positioning of the rails 61, 62 is easier compared to when three rails are used.

[0101] In the first embodiment, the outer surfaces of the lens holders 41 and 42 are polygonal when viewed in the axial direction L, but the present invention is not limited to this. The lens holders 41 and 42 may have any shape as long as the outer surfaces are spaced apart from the inner circumferential surface 35 of the support tube 31.

[0102] A zoom camera in a first aspect comprises a cam having a cylindrical shape extending in the axial direction and forming a first groove and a second groove on its peripheral surface, each of which extends with circumferential and axial components; first and second movable lenses having a common optical axis, housed in the cam so that the optical axis extends in the axial direction, and moving so that their position and spacing in the axial direction changes; a first lens holder that holds the first movable lens and has a first protrusion that protrudes from its side into the first groove; a second lens holder that holds the second movable lens and has a second protrusion that protrudes from its side into the second groove; a rail that extends in the axial direction inside the cam and with which the first lens holder and the second lens holder are movably engaged; a support part that supports the rail; and a drive device that rotates the cam relative to the support part, wherein the axial spacing between the first groove and the second groove changes along the circumferential direction.

[0103] As a zoom camera in the second aspect, in the zoom camera in the first aspect, the rail engages with the first lens holder and the second lens holder with the side surfaces of the first lens holder and the second lens holder spaced apart from the inner surface of the cam and the support portion.

[0104] As a zoom camera in the third aspect, in the zoom camera in the second aspect, the first lens holder has a first engagement portion that engages with the rail at a circumferentially different position from the first protrusion, and the second lens holder has a second engagement portion that engages with the rail at a circumferentially different position from the second protrusion.

[0105] A zoom camera according to a fourth aspect is the zoom camera according to the third aspect, wherein the support portion has a cylindrical shape to which a fixed lens is fixed at the tip.

[0106] A zoom camera according to a fifth aspect is the zoom camera according to the fourth aspect, wherein an axially extending rail groove is provided on the inner circumferential surface of the support portion, and the rail is disposed in the rail groove.

[0107] A sixth aspect of the zoom camera is the zoom camera according to the fourth or fifth aspect, wherein the support portion has an opening at a position facing the rail.

[0108] A zoom camera in a seventh aspect is a zoom camera in any of the fourth to sixth aspects, wherein the first lens holder has a planar first side surface facing the rail, the second lens holder has a planar second side surface facing the rail, the first engagement portion is provided on the first side surface, and the second engagement portion is provided on the second side surface.

[0109] As a zoom camera in an eighth aspect, in a zoom camera in any of the fourth to seventh aspects, the rail has two rails spaced apart circumferentially and sandwiching a first protrusion and a second protrusion, and the first engagement portion and the second engagement portion each have two engagement portions that engage with the two rails.

[0110] A zoom camera in a ninth aspect is the zoom camera in the seventh aspect, wherein the first lens holder has a third side surface on which the first protrusion is provided and a fourth side surface opposite the third side surface, and when viewed in the axial direction, the distance between the inner surface of the support part and the first side surface is greater than the distance between the inner surface of the support part and the fourth side surface, and the second lens holder has a fifth side surface on which the second protrusion is provided and a sixth side surface opposite the fifth side surface, and when viewed in the axial direction, the distance between the inner surface of the support part and the second side surface is greater than the distance between the inner surface of the support part and the sixth side surface.

[0111] A zoom camera in a tenth aspect is the zoom camera in the ninth aspect, wherein the first side surface has a larger area than the third side surface, and the second side surface has a larger area than the fifth side surface.

[0112] The component mounting device in the eleventh aspect includes a mounting head that holds components, a stage that supports a substrate on which the components are mounted, a zoom camera of any of the first to tenth aspects that has a constant axial distance to the stage, and a control unit that controls the amount of relative rotation of the cam with respect to the support part by the drive device based on information about the components.

[0113] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom. [Industrial Applicability]

[0114] The zoom camera of the present disclosure is particularly useful in a component mounting device that recognizes a component by focusing the zoom camera on the component when mounting the component on a board. [Explanation of symbols]

[0115] 1. Parts mounting device 5 Stages 7 Mounting head 8. Zoom Camera 10 Camera body 11 Fixed Lens 12 Drive unit 14, 15 Movable lens 21 Cam 22, 23 groove 31 Support pipe 32, 33, 34 aperture 35 Inner peripheral surface 41, 42 Lens holder 43, 44 Holding part 45, 46 protrusion 47A, 47B, 48A, 48B Engagement part 61, 62 rails

Claims

1. a cam having a cylindrical shape extending in an axial direction, and having a first groove and a second groove formed on a peripheral surface thereof, the first groove and the second groove each having a circumferential component and an axial component; a first movable lens and a second movable lens that have a common optical axis, are accommodated in the cam so that the optical axis extends in the axial direction, and move so that their positions and intervals in the axial direction change; a first lens holder that holds the first movable lens and has a first protrusion that protrudes from a side surface into the first groove; a second lens holder that holds the second movable lens and has a second protrusion that protrudes from a side surface into the second groove; a rail extending in the axial direction inside the cam and with which the first lens holder and the second lens holder are movably engaged; a support portion that supports the rail; a drive device that rotates the cam relative to the support portion, A zoom camera, wherein the axial distance between the first groove and the second groove varies along the circumferential direction.

2. 2. The zoom camera of claim 1, wherein the rail engages with the first lens holder and the second lens holder while the side surfaces of the first lens holder and the second lens holder are spaced apart from the inner surface of the cam and the support portion.

3. the first lens holder has a first engagement portion that engages with the rail at a position different from that of the first protrusion in the circumferential direction, 3. The zoom camera according to claim 2, wherein the second lens holder has a second engagement portion that engages with the rail at a position different from that of the second protrusion in the circumferential direction.

4. 4. The zoom camera according to claim 3, wherein the support portion has a cylindrical shape to which a fixed lens is fixed at a tip.

5. a rail groove extending in the axial direction is provided on an inner peripheral surface of the support portion, The zoom camera of claim 4 , wherein the rail is disposed in the rail groove.

6. The zoom camera according to claim 4 , wherein the support portion has an opening at a position facing the rail.

7. the first lens holder has a first flat side surface facing the rail; the second lens holder has a second planar side surface facing the rail; The first engagement portion is provided on the first side surface, The zoom camera according to claim 4 , wherein the second engagement portion is provided on the second side surface.

8. the rail includes two rails spaced apart in the circumferential direction and sandwiching the first protrusion and the second protrusion, 5. The zoom camera according to claim 4, wherein the first engaging portion and the second engaging portion each have two engaging portions that engage with the two rails.

9. the first lens holder has a third side surface on which the first protrusion is provided and a fourth side surface opposite to the third side surface, When viewed in the axial direction, a distance between the inner circumferential surface of the support portion and the first side surface is larger than a distance between the inner circumferential surface of the support portion and the fourth side surface, the second lens holder has a fifth side surface on which the second protrusion is provided and a sixth side surface opposite to the fifth side surface, 8. The zoom camera according to claim 7, wherein, when viewed in the axial direction, a distance between the inner circumferential surface of the support portion and the second side surface is larger than a distance between the inner circumferential surface of the support portion and the sixth side surface.

10. the first side has a larger area than the third side; The zoom camera of claim 9 , wherein the second side surface has a larger area than the fifth side surface.

11. a loading head for holding a component; a stage for supporting a substrate on which the component is mounted; a zoom camera according to any one of claims 1 to 10, wherein the distance to the stage along the axial direction is constant; a control unit that controls the amount of relative rotation of the cam with respect to the support portion by the drive device based on the information about the component.

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