Optical devices

Abstract

The present invention provides an optical device capable of improving the positional accuracy of multiple fixing positions of a rotating member relative to a fixed member. [Solution] The device comprises a housing having an objective lens mounting section and a device fixing section, a lens drum 40 rotatably mounted on the housing and having first and fourth perforations and second and fifth perforations that are axially opposed to the objective lens mounting section and the device fixing section, and first and second click mechanisms 82 and 83 provided corresponding to the first and fourth perforations and the second and fifth perforations, which can fix the lens drum 40 to the housing with the axes of the objective lens mounting section and the device fixing section aligned with the axes of the first and fourth perforations and the second and fifth perforations, respectively, and the first and second click mechanisms 82 and 83 can individually adjust the fixing position of the lens drum 40 with respect to the housing.

Description

Technical Field

[0001] The present invention relates to an optical device.

Background Art

[0002] Patent Document 1 describes an electric revolver used in microscopes. The electric revolver described in Patent Document 1 includes a mounting member to be attached to a microscope, a revolver rotating plate rotatable relative to the mounting member, a plurality of objective lenses provided on the revolver rotating plate, a plurality of click grooves provided on the outer peripheral surface of the revolver rotating plate corresponding to the plurality of objective lenses, and a positioning roller engageable with the click grooves.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of Invention

Problems to be Solved by the Invention

[0004] In the technique described in Patent Document 1, if the assembly accuracy of each objective lens to the revolver rotating plate is low, even if the optical axis of one objective lens is accurately aligned with the optical axis of the microscope, a problem arises in that the optical axes of other objective lenses are displaced relative to the optical axis of the microscope.

[0005] An object of the present disclosure is to provide an optical device capable of improving the positional accuracy of a plurality of fixed positions of a rotating member relative to a fixing member.

Means for Solving the Problems

[0006] This disclosure provides a fixed member having a first through hole, a rotating member rotatably mounted on the fixed member and having a plurality of second through holes that are axially opposed to the first through hole, and a plurality of click mechanisms provided corresponding to each of the second through holes, which are capable of fixing the rotating member to the fixed member with the axis of the first through hole and the axis of the second through hole aligned, wherein each of the click mechanisms can individually adjust the fixing position of the rotating member to the fixed member. [Effects of the Invention]

[0007] According to this disclosure, it is possible to realize an optical device that can improve the positional accuracy of multiple fixing positions of a rotating member relative to a fixed member. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the optical device from above. [Figure 2] Figure 2 is a perspective view of the optical device from below. [Figure 3] Figure 3 is a cross-sectional view of the optical device along the optical axis. [Figure 4] Figure 4 is a perspective view showing the housing and click mechanism. [Figure 5] Figure 5 is a perspective view showing the lens drum and click mechanism. [Figure 6] Figure 6 is a view taken along arrow A in Figure 5. [Figure 7] Figure 7 is a view taken along arrow B in Figure 5. [Figure 8] Figure 8 shows the method for fixing the first element lens to the first hole. [Figure 9] Figure 9 is a perspective view of the lens drum unit, seen from the side where the first, second, and third perforations are visible. [Figure 10] Figure 10 is a perspective view of the lens drum unit, seen from the side where the fourth, fifth, and sixth perforations are visible. [Figure 11] Figure 11 is a view taken along arrow C in Figure 6. [Figure 12] Figure 12 is a perspective view showing the click device alone. [Figure 13] Figure 13 is a diagram showing a cam member adjustment method (1). [Figure 14] Figure 14 is a diagram showing a cam member adjustment method (2). [Figure 15] Figure 15 is a diagram showing a spring force adjustment method (1). [Figure 16] Figure 16 is a diagram showing a spring force adjustment method (2). [Mode for Carrying Out the Invention]

[0009] Hereinafter, one embodiment will be described in detail with reference to the drawings.

[0010] Figure 1 is a perspective view of the optical device as viewed from above. Figure 2 is a perspective view of the optical device as viewed from below. Figure 3 is a cross-sectional view of the optical device along the optical axis direction. Figure 4 is a perspective view showing the housing and the click device.

[0011] Here, as shown in FIGS. 1 to 3, in the extending direction of the optical axis AX of the optical device 10, the side on which the imaging element SE of an optical apparatus such as an electron microscope is disposed is defined as the "upper side", and the side on which the imaging target object TA is disposed is defined as the "lower side". Further, the direction orthogonal to the optical axis AX and in which the rotation axis RA of the lens drum 40 extends is defined as the "left-right direction". Specifically, the side on which the first dial DL1 operable by the operator's right hand is disposed is the "right side", and the side on which the second dial DL2 operable by the operator's left hand is disposed is the "left side".

[0012] <Overview of Optical Device> As shown in Figures 1 to 3, the optical device 10 includes a housing 20 and a lens drum 40. Both the housing 20 and the lens drum 40 are formed in a substantially cylindrical shape, and the lens drum 40 is rotatably accommodated inside the housing 20. The axis of the housing 20 extends in the extending direction of the optical axis AX, and the axis of the lens drum 40 extends in the extending direction of the rotation axis RA orthogonal to the optical axis AX. That is, the axis of the housing 20 and the axis of the lens drum 40 are orthogonal to each other.

[0013] An objective lens unit 30 is provided on the lower side in the axial direction of the housing 20, that is, on the imaging target object TA side. Further, the lens drum 40 rotatable inside the housing 20 is provided with a first lens unit 50 and a second lens unit 60 that can be arranged on the optical axis AX of the objective lens unit 30, and a through portion 70 not provided with a lens.

[0014] Then, the optical device 10 can image the imaging target object TA at various magnifications by aligning the first optical axis AX1 of the first lens unit 50 with the optical axis AX, aligning the second optical axis AX2 of the second lens unit 60 with the optical axis AX, or aligning the axis AX3 of the through portion 70 with the optical axis AX. Here, the alignment of the first optical axis AX1 and the second optical axis AX2 with respect to the optical axis AX is performed with high accuracy by the click device 80 shown in Figures 4 to 7. Note that Figure 3 shows a state where the first optical axis AX1 of the first lens unit 50 is aligned with the optical axis AX.

[0015] <Housing> As shown in Figure 3, the housing 20 is formed in a substantially cylindrical shape, and a substantially cylindrical objective lens mounting portion 21 is provided on the lower side in the axial direction of the housing 20. The objective lens unit 30 is mounted to the objective lens mounting portion 21 by screw coupling. Thereby, the optical axis AX of the objective lens unit 30 is arranged on the axis of the housing 20. Here, the objective lens unit 30 includes a first objective lens 31 and a second objective lens 32.

[0016] Furthermore, an instrument fixing portion 22 is provided on the axial upper side of the housing 20, to which an optical instrument (not shown), such as an electron microscope, is fixed. In other words, the housing 20 is fixed to the optical instrument and corresponds to the fixing member in the present invention. The objective lens mounting portion 21 and the instrument fixing portion 22 are paired and penetrate the housing 20 in its axial direction, and correspond to the first through hole in the present invention. Moreover, the first objective lens 31 and the second objective lens 32 provided in the objective lens mounting portion 21 are paired and their optical axes AX are positioned on the axis of the objective lens mounting portion 21, and correspond to the first lens in the present invention.

[0017] Furthermore, as shown in Figures 1, 2, and 4, a first support wall 23 and a second support wall 24 are provided on the left and right sides of the housing 20 along the axial direction of the lens drum 40, respectively. The first support wall 23 rotatably supports the first shaft portion 42 (see Figures 5 and 6) located on the axial right side of the lens drum 40. In contrast, the second support wall 24 rotatably supports the second shaft portion 43 (see Figures 5 and 6) located on the axial left side of the lens drum 40. As a result, the lens drum 40 is rotatable relative to the housing 20 around a rotation axis RA that extends in a direction perpendicular to the optical axis AX of the objective lens unit 30.

[0018] Furthermore, as shown in Figure 4, a click device 80 is attached to the first support wall portion 23 of the housing 20. Specifically, the first support wall portion 23 is provided with a bottom wall 25 located inside the housing 20, and a rotating shaft 81 forming the click device 80 is attached to the bottom wall 25. As a result, the first shaft portion 42, which rotates relative to the first support wall portion 23, can also rotate relative to the click device 80.

[0019] <Lens Drum> Figure 5 is a perspective view showing the lens drum and click mechanism. Figure 6 is a view taken along arrow A in Figure 5. Figure 7 is a view taken along arrow B in Figure 5. Figure 8 shows the method of fixing the first element side lens to the first hole. Figure 9 is a perspective view of the lens drum alone, with the first, second, and third holes visible. Figure 10 is a perspective view of the lens drum alone, with the fourth, fifth, and sixth holes visible.

[0020] As shown in Figures 5 to 10, the lens drum 40 comprises a drum body 41 formed in a substantially cylindrical shape. A first shaft portion 42 is integrally provided on the axial right side of the drum body 41, which is rotatably supported by the first support wall portion 23 (see Figure 4) of the housing 20. Furthermore, a second shaft portion 43 is integrally provided on the axial left side of the drum body 41, which is rotatably supported by the second support wall portion 24 (see Figure 2) of the housing 20. The lens drum 40, which is rotatably provided with respect to the housing 20, corresponds to the rotating member in this invention.

[0021] Furthermore, the first shaft portion 42 and the second shaft portion 43 both have the same axial length and are shorter than the axial length of the drum body 41. In addition, the first shaft portion 42 and the second shaft portion 43 are formed in a solid, approximately cylindrical shape.

[0022] As shown in Figures 3, 9, and 10, the drum body 41 is provided with a first perforation 41a, a second perforation 41b, a third perforation 41c, a fourth perforation 41d, a fifth perforation 41e, and a sixth perforation 41f. Specifically, these first to sixth perforations 41a to 41f are arranged at equal intervals (60-degree intervals) in the circumferential direction of the drum body 41 and penetrate the drum body 41 in its radial direction. In the radial direction of the drum body 41, a pair of opposing first perforations 41a and 4th perforations 41d are paired, a pair of opposing second perforations 41b and 5th perforations 41e are paired, and a pair of opposing third perforations 41c and 6th perforations 41f are paired.

[0023] As shown in Figure 3, the first perforation 41a is provided with the first element-side lens 51. The fourth perforation 41d, which faces the first perforation 41a, is provided with the third element-side lens 52. The first element-side lens 51 and the third element-side lens 52 are arranged in pairs on the first optical axis AX1. In other words, the first lens unit 50 consists of the first element-side lens 51 and the third element-side lens 52, which are arranged on the first optical axis AX1 and are paired with each other.

[0024] Here, the paired first perforations 41a and 41d can face each other from the axial direction of the objective lens mounting portion 21 and the equipment fixing portion 22, which are also paired. The first perforations 41a and 41d, where the first lens unit 50 is located, are paired with each other and correspond to one of the multiple second through-holes in the present invention. Furthermore, the first element-side lens 51 and the third element-side lens 52, provided in the first perforations 41a and 41d, are paired with each other and have their first optical axis AX1 positioned on the axis of the first perforations 41a and 41d, respectively, and correspond to the second lens in the present invention.

[0025] The first element-side lens 51 is fixed to the first hole 41a by the fixing structure shown in Figure 8. Specifically, the first element-side lens 51 is supported by an annular lens frame 51a, and a compression spring 51b is provided on the left side of the lens frame 51a in Figure 8, that is, on the second shaft portion 43 side, to elastically support the lens frame 51a. The compression spring 51b is fixed to the drum body 41 by a pair of retaining pins 51c and presses the lens frame 51a in the direction of arrow F. The compression spring 51b also presses the lens frame 51a from its axial direction to prevent the first element-side lens 51 from falling out of the first hole 41a.

[0026] Furthermore, the lens frame 51a is pressed down from its radial direction by a pair of cam pins 51d. Specifically, the pair of cam pins 51d are located on the right side of the lens frame 51a in Figure 8, that is, on the side of the first shaft portion 42. Here, the single compression spring 51b and the pair of cam pins 51d are arranged at approximately equal intervals (60-degree intervals) in the circumferential direction of the lens frame 51a.

[0027] Furthermore, the cam pin 51d includes a support column 51e rotatably supported by the drum body 41, a cam portion 51f having its axis offset from the axis of the support column 51e, and a groove portion 51g into which a tool (not shown) for rotating the cam pin 51d can be inserted. As a result, the lens frame 51a and the first element-side lens 51 supported by the lens frame 51a can move against the spring force of the compression spring 51b (see arrow F) by rotating the pair of cam pins 51d, as shown by arrows M1 and M2. This allows the optical axis of the first element-side lens 51 and the optical axis of the third element-side lens 52 to be precisely aligned with each other, and consequently, the first optical axis AX1 of the first lens unit 50 to be precisely aligned with the optical axis AX.

[0028] As shown in Figure 3, the second perforation 41b is provided with the second element-side lens 61. The fifth perforation 41e, which is opposite the second perforation 41b, is provided with the fourth element-side lens 62. The second element-side lens 61 and the fourth element-side lens 62 are arranged in pairs on the second optical axis AX2. In other words, the second lens unit 60 consists of the second element-side lens 61 and the fourth element-side lens 62, which are arranged in pairs on the second optical axis AX2.

[0029] Here, the paired second perforations 41b and fifth perforations 41e are able to face each other from the axial direction of the objective lens mounting portion 21 and the equipment fixing portion 22, which are also paired. The second perforations 41b and fifth perforations 41e, where the second lens unit 60 is located, are paired with each other and correspond to the other second through-holes among the plurality of second through-holes in the present invention. Furthermore, the second element-side lens 61 and the fourth element-side lens 62 provided in the second perforations 41b and fifth perforations 41e are paired with each other and have their second optical axis AX2 positioned on the axis of the second perforations 41b and fifth perforations 41e, and correspond to the second lens in the present invention.

[0030] Here, the second element lens 61, as shown in Figure 5, is also equipped with an annular lens frame 51a, similar to the first element lens 51. This lens frame 51a is supported from three directions by a single compression spring 51b and a pair of cam pins 51d, and allows for precise adjustment of the optical axis.

[0031] Furthermore, as shown in Figure 3, the third perforation 41c and the sixth perforation 41f are not provided with lenses. In other words, the third perforation 41c and the sixth perforation 41f are through-holes that are paired with each other and have their centers located on the axis AX3.

[0032] Thus, the first optical axis AX1 of the first lens unit 50, the second optical axis AX2 of the second lens unit 60, and the axis AX3 of the through-hole 70 are each arranged so as to cross the rotation axis RA of the drum body 41 (lens drum 40), and are arranged at 60-degree intervals in the circumferential direction with respect to the rotation axis RA.

[0033] <Regarding the magnification of optical devices> Furthermore, the optical device 10 can be changed to magnification A or E as shown below by rotating the lens drum 40 relative to the housing 20.

[0034] As shown in Figure 3, when the first optical axis AX1 of the first lens unit 50 is aligned with the optical axis AX of the objective lens unit 30, and the first element-side lens 51 is positioned above the third element-side lens 52, the magnification is "A". Conversely, when the first optical axis AX1 of the first lens unit 50 is aligned with the optical axis AX of the objective lens unit 30, and the third element-side lens 52 is positioned above the first element-side lens 51, the magnification is "D".

[0035] Furthermore, if the second optical axis AX2 of the second lens unit 60 is aligned with the optical axis AX of the objective lens unit 30, and the second element-side lens 61 is positioned above the fourth element-side lens 62, the magnification becomes "magnification B". Conversely, if the second optical axis AX2 of the second lens unit 60 is aligned with the optical axis AX of the objective lens unit 30, and the fourth element-side lens 62 is positioned above the second element-side lens 61, the magnification becomes "magnification E".

[0036] Furthermore, when the axis AX3 of the through-hole 70 is aligned with the optical axis AX of the objective lens unit 30, the third hole 41c and the sixth hole 41f do not have lenses installed, so regardless of their vertical position, they all have the same "magnification C".

[0037] In other words, when the lens drum 40 is rotated 360 degrees relative to the housing 20 in the direction of arrow AD, the magnification becomes "Magnification A" at 0 degrees, "Magnification B" at 60 degrees, "Magnification C" at 120 degrees, "Magnification D" at 180 degrees, "Magnification E" at 240 degrees, "Magnification C" at 300 degrees, and returns to "Magnification A" at 360 degrees (0 degrees).

[0038] More specifically, when the lens drum 40 is rotated relative to the housing 20 in the direction of arrow AD, the magnification of the optical device 10 is changed sequentially as follows: ...magnification A → magnification B → magnification C → magnification D → magnification E → magnification C → magnification A.... Note that the lens drum 40 can also be rotated relative to the housing 20 in the direction opposite to that of arrow AD, in which case the magnification of the optical device 10 is changed sequentially in the opposite direction to the above: ...magnification A → magnification C → magnification E → magnification D → magnification C → magnification B → magnification A....

[0039] <First shaft section> As shown in Figures 5 to 10, the first shaft portion 42, located on the axial right side of the drum body 41, is provided with a first support portion 42a that is rotatably supported by the first support wall portion 23 (see Figure 1) of the housing 20. The first shaft portion 42 is also provided with a cylindrical portion 42b on which the first cam member 82c and the second cam member 83c (see Figure 12) of the click device 80 can roll on its surface as the lens drum 40 rotates relative to the housing 20. Furthermore, the first shaft portion 42 is provided with a first dial fixing portion 42c to which the first dial DL1 (see Figure 1) is fixed.

[0040] As shown in Figures 5, 6, 8 through 10, the cylindrical portion 42b is equipped with a first cam rolling portion 42d located closer to the drum body 41 in the axial direction of the lens drum 40. The cylindrical portion 42b is also equipped with a second cam rolling portion 42e located closer to the first dial fixing portion 42c in the axial direction of the lens drum 40. The first cam member 82c (see Figure 12) of the first click mechanism 82 rolls on the surface of the first cam rolling portion 42d. The second cam member 83c (see Figure 12) of the second click mechanism 83 rolls on the surface of the second cam rolling portion 42e. The dashed line in the figures indicates the boundary line between the first cam rolling portion 42d and the second cam rolling portion 42e.

[0041] As shown in Figures 7, 9, and 10, the first cam rolling portion 42d is provided with a first recess H1 and a second recess H2 recessed radially inward of the lens drum 40. Specifically, the first recess H1 and the second recess H2 are arranged at 180-degree intervals in the circumferential direction of the first cam rolling portion 42d. The first cam member 82c is designed to fit snugly into the first recess H1 and the second recess H2. In other words, when the first cam member 82c fits into the first recess H1 and the second recess H2, the lens drum 40 does not rattle relative to the housing 20. Furthermore, a moderate click sensation is provided when the first cam member 82c fits into the first recess H1 and the second recess H2.

[0042] Furthermore, as shown in Figures 7, 9, and 10, the second cam rolling section 42e is provided with a third recess H3, a fourth recess H4, a fifth recess H5, and a sixth recess H6 that are recessed radially inward of the lens drum 40. Specifically, the third recess H3 and the fifth recess H5 are arranged at 180-degree intervals in the circumferential direction of the second cam rolling section 42e. Similarly, the fourth recess H4 and the sixth recess H6 are also arranged at 180-degree intervals in the circumferential direction of the second cam rolling section 42e. In the circumferential direction of the second cam rolling section 42e, the third recess H3 and the sixth recess H6 are arranged at 60-degree intervals from each other, and the fourth recess H4 and the fifth recess H5 are also arranged at 60-degree intervals from each other.

[0043] Furthermore, the second cam member 83c is designed to fit snugly into the third recess H3 to the sixth recess H6. In other words, when the second cam member 83c is inserted into the third recess H3 to the sixth recess H6, the lens drum 40 does not rattle relative to the housing 20. In addition, a moderate click sensation is provided when the second cam member 83c is inserted into the third recess H3 to the sixth recess H6.

[0044] As described above, the first cam member 82c and the second cam member 83c of the click device 80 fit into and engage with the first recess H1 to the sixth recess H6 provided in the cylindrical portion 42b, respectively. In other words, the first recess H1 to the sixth recess H6 constitute part of the first click mechanism 82 and the second click mechanism 83 that form the click device 80. As shown in Figures 9 and 10, the first recess H1 and the third recess H3 are located at the same position in the circumferential direction of the cylindrical portion 42b, and the second recess H2 and the fifth recess H5 are located at the same position.

[0045] <Second shaft section> Furthermore, as shown in Figures 5, 6, and 8, the second shaft portion 43, located on the axial left side of the drum body 41, is provided with a second support portion 43a that is rotatably supported by the second support wall portion 24 (see Figure 2) of the housing 20. In addition, the second shaft portion 43 is provided with a second dial fixing portion 43b to which the second dial DL2 (see Figure 2) is fixed.

[0046] <Clicking device> Next, the click device 80, which is provided between the housing 20 and the lens drum 40, will be described in detail with reference to the drawings. Figure 11 is a view taken along arrow C in Figure 6. Figure 12 is a perspective view showing the click device alone.

[0047] As shown in Figures 11 and 12, the click device 80 includes a rotating shaft 81, the axial left side of which is mounted on the bottom wall 25 of the housing 20 (see Figure 4). In other words, the click device 80 is provided in the housing 20 via the rotating shaft 81. The click device 80 also includes a first click mechanism 82 and a second click mechanism 83, which are arranged in a two-tiered configuration in the axial direction of the rotating shaft 81. Furthermore, the first click mechanism 82 is provided in correspondence with the first cam rolling part 42d and is located on the axial left side of the rotating shaft 81. In contrast, the second click mechanism 83 is provided in correspondence with the second cam rolling part 42e and is located on the axial right side of the rotating shaft 81. The two first click mechanisms 82 and second click mechanisms 83 are arranged circumferentially around the lens drum 40 with the rotating shaft 81 at the center.

[0048] The first click mechanism 82 is provided with a first rod member 82a that extends in the circumferential direction of the cylindrical portion 42b (see Figure 11). Specifically, the base end (left end in Figure 11) of the first rod member 82a is rotatably mounted on a rotating shaft 81 fixed to the bottom wall 25. On the other hand, a first cam member 82c is rotatably mounted on the tip (right end in Figure 11) of the first rod member 82a via a first eccentric pin 82b. Furthermore, a first spring force adjustment pin 82d that supports the first arm portion 84b of the torsion coil spring 84 is provided approximately in the center along the longitudinal direction of the first rod member 82a.

[0049] The second click mechanism 83 is provided with a second rod member 83a that extends in the circumferential direction of the cylindrical portion 42b (see Figure 11). Specifically, the base end (right end in Figure 11) of the second rod member 83a is rotatably mounted on a rotating shaft 81 fixed to the bottom wall 25. On the other hand, a second cam member 83c is rotatably mounted on the tip (left end in Figure 11) of the second rod member 83a via a second eccentric pin 83b. Furthermore, a second spring force adjustment pin 83d is provided approximately in the center along the longitudinal direction of the second rod member 83a, supporting the second arm portion 84c of the torsion coil spring 84.

[0050] Furthermore, a torsion coil spring (spring member) 84 is attached to the rotating shaft 81. Specifically, the torsion coil spring 84 comprises a coil portion 84a and a first arm portion 84b and a second arm portion 84c that protrude radially outward from the coil portion 84a. The coil portion 84a of the torsion coil spring 84 is attached to the rotating shaft 81. The first arm portion 84b is hooked onto a first spring force adjustment pin 82d, and the second arm portion 84c is hooked onto a second spring force adjustment pin 83d.

[0051] Here, the spring force of the torsion coil spring 84 acts to press the first cam member 82c of the first click mechanism 82 and the second cam member 83c of the second click mechanism 83 against the first cam rolling portion 42d and the second cam rolling portion 42e, respectively. That is, the first cam member 82c of the first click mechanism 82 and the second cam member 83c of the second click mechanism 83 are driven into and pressed against the first recess H1 to the sixth recess H6, respectively, by the spring force of one torsion coil spring 84.

[0052] Furthermore, the first cam member 82c and the second cam member 83c cannot simultaneously engage with any of the first to sixth recesses H1 to H6. In other words, when the first cam member 82c engages with either the first or second recess H1, the second cam member 83c does not engage with any of the third to sixth recesses H3 to H6. Also, when the second cam member 83c engages with any of the third to sixth recesses H3 to H6, the first cam member 82c does not engage with either the first or second recess H2. This makes it possible to keep the click sensation of the click device 80 approximately constant at any fixed position when the lens drum 40 is rotated relative to the housing 20. Thus, a good operating feel for the optical device 10 can be obtained.

[0053] As shown in Figure 12, the first eccentric pin 82b is provided with a large-diameter cylindrical portion LC that is rotatably mounted on the first rod member 82a, a small-diameter cylindrical portion SC that has a smaller diameter than the large-diameter cylindrical portion LC and whose axis is offset from the axis of the large-diameter cylindrical portion LC, and a groove GV provided in the small-diameter cylindrical portion SC into which a tool (not shown) for rotating the first eccentric pin 82b can be inserted. As a result, by rotating the first eccentric pin 82b relative to the first rod member 82a, the small-diameter cylindrical portion SC and the first cam member 82c, which is rotatably mounted on the small-diameter cylindrical portion SC, can move closer to or further away from the rotation axis 81. The second eccentric pin 83b is formed in the same shape as the first eccentric pin 82b.

[0054] Furthermore, as shown in Figure 12, the first spring force adjustment pin 82d is provided with a small-diameter portion SD that is rotatably mounted on the first rod member 82a, a large-diameter portion LD that is larger in diameter than the small-diameter portion SD and has its axis offset from the axis of the small-diameter portion SD, and a groove CG provided in the large-diameter portion LD into which a tool (not shown) for rotating the first spring force adjustment pin 82d can be inserted. As a result, by rotating the first spring force adjustment pin 82d relative to the first rod member 82a, the large-diameter portion LD can be moved radially outward or radially inward relative to the first shaft portion 42 (see Figure 11). The second spring force adjustment pin 83d is formed in the same shape as the first spring force adjustment pin 82d.

[0055] <Relationship between magnification of optical devices and click mechanism> Here, the first cam member 82c and the second cam member 83c engage with the first recess H1 to the sixth recess H6 as described below, thereby obtaining the magnification A to E of the optical device 10 as described above. The magnification A to E and the operation of the click device 80 will be explained below using Figures 7, 9, and 10.

[0056] When the first cam member 82c enters and engages with the first recess H1, the optical device 10 enters the state shown in Figure 3, resulting in "magnification A". From this "magnification A" state, rotating the lens drum 40 by 60 degrees in the direction of arrow AD causes the second cam member 83c to enter and engage with the sixth recess H6, resulting in "magnification B" for the optical device 10. Furthermore, rotating the lens drum 40 by 60 degrees in the direction of arrow AD from this "magnification B" state causes the second cam member 83c to enter and engage with the third recess H3, resulting in "magnification C" for the optical device 10. Finally, rotating the lens drum 40 by 60 degrees in the direction of arrow AD from this "magnification C" state causes the first cam member 82c to enter and engage with the second recess H2, resulting in "magnification D" for the optical device 10.

[0057] Furthermore, when the lens drum 40 is rotated 60 degrees in the direction of arrow AD from the state of "magnification D", the second cam member 83c enters into and engages with the fourth recess H4, and the optical device 10 becomes "magnification E". Furthermore, when the lens drum 40 is rotated 60 degrees in the direction of arrow AD from the state of "magnification E", the second cam member 83c enters into and engages with the fifth recess H5, and the optical device 10 becomes "magnification C". Furthermore, when the lens drum 40 is rotated 60 degrees in the direction of arrow AD from the state of "magnification C", the first cam member 82c enters into and engages with the first recess H1, and the optical device 10 becomes "magnification A".

[0058] <Method for adjusting the optical axis> Next, the method for adjusting the optical axis of the optical device 10 will be explained in detail with reference to the drawings. Figure 13 shows the adjustment method (1) of the cam member. Figure 14 shows the adjustment method (2) of the cam member. In the optical device 10, the first optical axis AX1 of the first lens unit 50 and the second optical axis AX2 of the second lens unit 60 can be individually and precisely adjusted with respect to the optical axis AX of the objective lens unit 30 (see Figures 1 to 3).

[0059] Here, the first click mechanism 82 has the function of fixing the first optical axis AX1 in a state where it is aligned with the optical axis AX. That is, the first click mechanism 82 is provided in correspondence with the first perforation 41a and the fourth perforation 41d which are arranged coaxially with each other, and positions the lens drum 40 relative to the housing 20 with respect to the axis of the first perforation 41a and the fourth perforation 41d, while aligning the axis of the objective lens mounting part 21 and the equipment fixing part 22 with the axis of the first perforation 41a and the fourth perforation 41d.

[0060] In contrast, the second click mechanism 83 has the function of fixing the second optical axis AX2 in a state where it is aligned with the optical axis AX. That is, the second click mechanism 83 is provided in correspondence with the second perforation 41b and the fifth perforation 41e which are arranged coaxially with each other, and positions the lens drum 40 relative to the housing 20 with respect to the axis of the second perforation 41b and the fifth perforation 41e, while aligning the axis of the objective lens mounting part 21 and the equipment fixing part 22 with the axis of the second perforation 41b and the fifth perforation 41e.

[0061] Furthermore, since no lens is provided on the axis AX3 of the through-hole 70, it is not necessary to precisely align the axis AX3 with the optical axis AX. Therefore, in this embodiment, the second click mechanism 83 is used to fix the axis AX3 in a state where it is aligned with the optical axis AX.

[0062] As shown in Figures 13 and 14, when the first eccentric pin 82b of the first click mechanism 82 is rotated as indicated by arrow R1, the first eccentric pin 82b rotates around the axis C1 of the large-diameter cylindrical portion LC. As a result, the axis C2 of the small-diameter cylindrical portion SC, which rotatably supports the first cam member 82c, moves around the axis C1 of the large-diameter cylindrical portion LC. Therefore, the distance L1 between the rotation center (axis C2) of the first cam member 82c and the axis CR of the rotation shaft 81 is adjusted within any range from the longest (max) to the shortest (min). In other words, the distance between the first cam member 82c and the rotation shaft 81 is adjusted.

[0063] This allows for fine adjustment of the fixing position of the lens drum 40 relative to the housing 20 by the first click mechanism 82. Therefore, the first optical axis AX1 of the first lens unit 50 can be precisely aligned with the optical axis AX of the objective lens unit 30. After the optical axis alignment of the first optical axis AX1 with respect to the optical axis AX is completed, the first eccentric pin 82b is fixed to the first rod member 82a using an adhesive (not shown) made of ultraviolet curing resin or the like.

[0064] Furthermore, when the second eccentric pin 83b of the second click mechanism 83 is rotated as indicated by arrow R2, the second eccentric pin 83b rotates around the axis C1 of the large-diameter cylindrical portion LC. As a result, the axis C2 of the small-diameter cylindrical portion SC, which rotatably supports the second cam member 83c, moves around the axis C1 of the large-diameter cylindrical portion LC. Therefore, the distance L2 between the rotation center (axis C2) of the second cam member 83c and the axis CR of the rotation shaft 81 can be adjusted within any range from the longest (max) to the shortest (min). In other words, the distance between the second cam member 83c and the rotation shaft 81 is adjusted.

[0065] This allows for fine adjustment of the fixing position of the lens drum 40 relative to the housing 20 by the second click mechanism 83. Therefore, the second optical axis AX2 of the second lens unit 60 can be precisely aligned with the optical axis AX of the objective lens unit 30. After the optical axis alignment of the second optical axis AX2 with respect to the optical axis AX is completed, the second eccentric pin 83b is fixed to the second rod member 83a using an adhesive (not shown) made of ultraviolet curing resin or the like.

[0066] Thus, the first click mechanism 82 and the second click mechanism 83 can individually adjust the fixing position of the lens drum 40 relative to the housing 20. Therefore, the first optical axis AX1 of the first lens unit 50 and the second optical axis AX2 of the second lens unit 60 can be precisely aligned with the optical axis AX. Thus, even if there are variations in the precision of the parts forming the first lens unit 50 and the second lens unit 60, or mounting errors of the first lens unit 50 and the second lens unit 60 relative to the lens drum 40, the first optical axis AX1 and the second optical axis AX2 can be precisely aligned with the optical axis AX.

[0067] <How to adjust spring force> Furthermore, in the optical device 10, the spring force of the torsion coil spring 84 that forms the click mechanism 80 is also adjustable. The method for adjusting the spring force of the torsion coil spring will be explained in detail below with reference to the drawings. Figure 15 shows method (1) for adjusting the spring force. Figure 16 shows method (2) for adjusting the spring force.

[0068] As shown in Figures 15 and 16, when the first spring force adjustment pin 82d of the first click mechanism 82 is rotated as indicated by arrow R3, the first spring force adjustment pin 82d rotates around the axis C3 of the small diameter portion SD. As a result, the axis C4 of the large diameter portion LD of the first spring force adjustment pin 82d moves around the axis C3 of the small diameter portion SD. Therefore, the distance L3 between the small diameter portion SD of the first spring force adjustment pin 82d and the first arm portion 84b of the torsion coil spring 84 can be arbitrarily adjusted within the range from maximum (max) to minimum (min).

[0069] Furthermore, when the second spring force adjustment pin 83d of the second click mechanism 83 is rotated as indicated by arrow R4, the second spring force adjustment pin 83d rotates around the axis C3 of the small diameter portion SD. As a result, the axis C4 of the large diameter portion LD of the second spring force adjustment pin 83d moves around the axis C3 of the small diameter portion SD. Therefore, the distance L4 between the small diameter portion SD of the second spring force adjustment pin 83d and the second arm portion 84c of the torsion coil spring 84 can be arbitrarily adjusted within the range from maximum (max) to minimum (min).

[0070] This adjusts the angle between the first arm portion 84b and the second arm portion 84c, centered on the coil portion 84a of the torsion coil spring 84, thereby allowing adjustment of the spring force of the torsion coil spring 84. Consequently, the pressing force of the first cam member 82c of the first click mechanism 82 and the second cam member 83c of the second click mechanism 83 against the cylindrical portion 42b is adjusted from a large pressing force F1 (see Figure 15) to a small pressing force F2, thereby allowing adjustment of the click feel of the click device 80. After adjusting the spring force of the torsion coil spring 84, the first spring force adjustment pin 82d and the second spring force adjustment pin 83d are fixed to the first rod member 82a and the second rod member 83a, respectively, using an adhesive (not shown) made of ultraviolet curing resin or the like.

[0071] As described in detail above, the optical device 10 includes a housing 20 having an objective lens mounting section 21 and an instrument fixing section 22; a lens drum 40 rotatably mounted on the housing 20 and having first and fourth perforations 41a, 41d and second and fifth perforations 41b, 41e that are axially opposed to the objective lens mounting section 21 and the instrument fixing section 22; and first and second click mechanisms 82, 83 provided corresponding to the first and fourth perforations 41a, 41d and the second and fifth perforations 41b, 41e, which can fix the lens drum 40 to the housing 20 with the axes of the objective lens mounting section 21 and the instrument fixing section 22 aligned with the axes of the first and fourth perforations 41a, 41d and the second and fifth perforations 41b, 41e, respectively, and the first and second click mechanisms 82, 83 can individually adjust the fixing position of the lens drum 40 with respect to the housing 20.

[0072] This makes it possible to improve the positional accuracy of the multiple fixing positions of the lens drum 40 relative to the housing 20. Furthermore, since the first and second click mechanisms 82 and 83 can individually adjust the fixing positions of the lens drum 40 relative to the housing 20, even if there are variations in the precision of the parts forming the first and second lens units 50 and 60, or mounting errors of the first and second lens units 50 and 60 relative to the lens drum 40, the first and second optical axes AX1 and AX2 can be accurately aligned with the optical axis AX.

[0073] Furthermore, according to the optical device 10, the first and second click mechanisms 82 and 83 are provided on the lens drum 40 and include a first recessed portion H1 to a sixth recessed portion H6 recessed radially inward of the lens drum 40, first and second rod members 82a and 83a whose base ends are rotatably mounted on a rotating shaft 81 provided on the housing 20, and first and second cam members 82c and 83c provided at the tips of the first and second rod members 82a and 83a and which fit into the first recessed portion H1 to the sixth recessed portion H6. The first and second cam members 82c and 83c are mounted on the first and second rod members 82a and 83a via first and second eccentric pins 82b and 83b, and the distances L1 and L2 between the first and second cam members 82c and 83c and the rotating shaft 81 are adjusted by the rotation of the first and second eccentric pins 82b and 83b.

[0074] This allows the first optical axis AX1 and the second optical axis AX2 to be precisely aligned with the optical axis AX simply by rotating the first and second eccentric pins 82b and 83b. Therefore, the optical axis alignment process can be easily performed.

[0075] Furthermore, according to the optical device 10, two first and second click mechanisms 82 and 83 are arranged in the circumferential direction of the lens drum 40, and the first and second cam members 82c and 83c of each of the first and second click mechanisms 82 and 83 are pressed against the first recess H1 to the sixth recess H6, respectively, by the spring force of a torsion coil spring 84.

[0076] This allows the first optical axis AX1 and the second optical axis AX2 to be fixed so as not to shift along the optical axis AX, enabling accurate imaging (observation) of the object to be imaged TA (see Figures 1 and 2). Furthermore, the spring force of a single torsion coil spring 84 causes the first and second cam members 82c and 83c to engage with the first recess H1 to the sixth recess H6. As a result, a consistent and appropriate click sensation can be obtained, improving the operability of the optical device 10.

[0077] Furthermore, according to the optical device 10, the torsion coil spring 84 comprises a coil portion 84a and a pair of first and second arm portions 84b and 84c that protrude radially outward from the coil portion 84a. The first and second rod members 82a and 83a that form the two first and second click mechanisms 82 and 83 are provided with first and second spring force adjustment pins 82d and 83d that can adjust the angle between the pair of first and second arm portions 84b and 84c.

[0078] This allows the spring force of the torsion coil spring 84 to be adjusted. Consequently, the pressing force of the first cam member 82c of the first click mechanism 82 and the second cam member 83c of the second click mechanism 83 against the cylindrical portion 42b can be adjusted, and thus the click feel of the click device 80 can be adjusted. Therefore, the convenience of the optical device 10 can be improved.

[0079] Furthermore, according to the optical device 10, the objective lens mounting section 21 is provided with first and second objective lenses 31 and 32 whose optical axis AX is positioned on the axis of the objective lens mounting section 21, and the first and fourth perforations 41a and 41d and the second and fifth perforations 41b and 41e are provided with first and third element-side lenses 51 and 52 whose first optical axis AX1 is positioned on the axis of the first and fourth perforations 41a and 41d, respectively, and second and fourth element-side lenses 61 and 62 whose second optical axis AX2 is positioned on the axis of the second and fifth perforations 41b and 41e.

[0080] This allows the first and second optical axes AX1 and AX2 to be precisely aligned with optical axis AX, and consequently, the respective magnifications, i.e., "magnification A" to "magnification E," to be accurately obtained. Furthermore, the optical device 10 can be applied to optical instruments that require high magnification, such as electron microscopes.

[0081] In the above-described embodiment, the click device 80 was shown to be equipped with two first and second click mechanisms 82 and 83. However, the click device is not limited to this disclosure and may be equipped with three or more click mechanisms. For example, if four click mechanisms are provided, it becomes possible to individually and accurately align the four optical axes provided on the lens drum with respect to the optical axis of the housing.

[0082] Furthermore, in the above-described embodiment, first and second spring force adjustment pins 82d and 83d supporting the first and second arm portions 84b and 84c of the torsion coil spring 84 are provided approximately in the center along the longitudinal direction of the first and second rod members 82a and 83a, respectively. However, the invention is not limited to this disclosure, and either of the first and second spring force adjustment pins 82d and 83d can be a simple, non-adjustable pin. In this case as well, the spring force of the torsion coil spring 84 can be adjusted.

[0083] Furthermore, while the above-described embodiment shows the optical device 10 being applicable to optical instruments such as electron microscopes, the invention is not limited to this disclosure and can also be applied to other optical instruments such as telescopes and high-magnification zoom lenses for cameras.

[0084] Furthermore, although the above-described embodiment shows the optical device 10 as a monocular optical device having one lens in the longitudinal direction of the drum body 41, the invention is not limited to this disclosure and may also be a compound optical device consisting of two or more lenses arranged in the longitudinal direction of the drum body 41. [Explanation of Symbols]

[0085] 10...Optical device, 20...Housing (fixing member), 21...Objective lens mounting part (first through hole), 22...Equipment fixing part (first through hole), 23...First support wall part, 24...Second support wall part, 25...Bottom wall, 30...Objective lens unit, 31...First objective lens (first lens), 32...Second objective lens (first lens), 40...Lens drum (rotating member), 41...Drum body, 41a...First perforation (second through hole), 41b...Second perforation (second through hole), 41c...Third perforation, 41d...Fourth perforation (second through hole), 4 1e...5th perforation (2nd through-hole), 41f...6th perforation, 42...1st shaft section, 42a...1st support section, 42b...Cylindrical section, 42c...1st dial fixing section, 42d...1st cam rolling section, 42e...2nd cam rolling section, 43...2nd shaft section, 43a...2nd support section, 43b...2nd dial fixing section, 50...1st lens unit, 51...1st element-side lens (2nd lens), 51a...Lens frame, 51b...Compression spring, 51c...Retaining pin, 51d...Cam pin, 51e...Support column, 51f...Cam section, 51g...Groove section, 52...3rd Element-side lens (second lens), 60...Second lens unit, 61...Second element-side lens (second lens), 62...Fourth element-side lens (second lens), 70...Pass-through section, 80...Click device, 81...Rotation shaft, 82...First click mechanism, 82a...First rod member, 82b...First eccentric pin, 82c...First cam member, 82d...First spring force adjustment pin, 83...Second click mechanism, 83a...Second rod member, 83b...Second eccentric pin, 83c...Second cam member, 83d...Second spring force adjustment pin, 84...Twist Coil spring (spring member), 84a...coil part, 84b...first arm part, 84c...second arm part, AX...optical axis, AX1...first optical axis, AX2...second optical axis, AX3...axis line, CG...groove, DL1...first dial, DL2...second dial, GV...groove part, H1...first recess part, H2...second recess part, H3...third recess part, H4...fourth recess part, H5...fifth recess part, H6...sixth recess part, LC...large diameter cylinder part, LD...large diameter part, RA...rotation axis, SC...small diameter cylinder part, SD...small diameter part, SE...image sensor, TA...object to be imaged

Claims

1. A fixing member having a first through hole, A rotating member is provided on the fixed member so as to be rotatable and has a plurality of second through holes that are able to face the first through hole from the axial direction, A plurality of click mechanisms are provided corresponding to each of the second through holes, and the rotating member can be fixed to the fixing member with the axis of the first through hole and the axis of the second through hole aligned. Equipped with, Each of the aforementioned click mechanisms allows for individual adjustment of the fixing position of the rotating member relative to the fixed member. optical equipment.

2. In the optical apparatus described in claim 1, The aforementioned click mechanism is The rotating member is provided with a recessed portion that is recessed radially inward of the rotating member, A rod member whose base end is rotatably mounted on a rotating shaft provided on the fixing member, A cam member is provided at the tip of the rod member and fits into the recessed portion, It has, The cam member is attached to the rod member via an eccentric pin. The rotation of the eccentric pin adjusts the distance between the cam member and the rotating shaft. optical equipment.

3. In the optical apparatus described in claim 2, Two of the click mechanisms are arranged in the circumferential direction of the rotating member. Each of the cam members of the click mechanism is pressed against the recess by the spring force of a single spring member. optical equipment.

4. In the optical apparatus described in claim 3, The aforementioned spring member is The coil section, A pair of arm portions protruding radially outward from the coil portion, A torsion coil spring equipped with, Each of the rod members forming the two click mechanisms is provided with a spring force adjustment pin that allows adjustment of the angle between the pair of arm portions. optical equipment.

5. In the optical apparatus according to any one of claims 1 to 4, The first through-hole is provided with a first lens whose optical axis is positioned on the axis of the first through-hole. The second through-hole is provided with a second lens whose optical axis is positioned on the axis of the second through-hole. optical equipment.

Images