JP2016198306A - Ophthalmologic apparatus, control method of ophthalmologic apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus capable of improving operability in both of flutter operation and slow motion operation times.SOLUTION: An ophthalmologic apparatus comprises: an optometry part for examining eyes to be examined; a movable table for supporting eyes to be examined; a base for supporting the movable table so as to move relatively; and a joystick mechanism for relatively moving the movable table to the base. The joystick mechanism comprises: a friction plate 12 disposed on the base; a spherical body 13 rotatably disposed on the movable table and rolling and sliding on a surface of the friction plate 12; and friction force change means for changing friction force generated between the friction plate 12 and the spherical body 13.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an ophthalmologic apparatus, an ophthalmologic apparatus control method, and a program. In particular, an ophthalmologic apparatus having an optometry unit that examines an eye to be examined, and an operation member that operates to align the optometry part with respect to the eye to be examined, a control method for the ophthalmologic apparatus, The present invention relates to a program for executing a control method.

  Some ophthalmologic apparatuses have an optometry unit that examines an eye to be examined and a support mechanism that can move the optometry unit in a three-dimensional direction. Then, the optometry part can be aligned with the eye to be examined by moving the optometry part in a three-dimensional direction. For example, a joystick mechanism is used as an operation member used for alignment of the optometry unit. The joystick mechanism includes a tiltable operating rod, a spherical sliding body disposed below the operating rod, and a friction plate provided on the lower side of the sliding body and in contact with the sliding body. Then, a user such as an examiner can roughly move the optometry unit by moving the operating rod in parallel and sliding the sliding body and the friction plate, and by tilting the operating rod, the user can move the sliding body. The optometric part can be finely moved by rolling the surface of the friction plate. Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for returning the center position of a joystick using an electromagnet. Patent Document 2 shows the structure of an operation rod of a conventional ophthalmic apparatus.

  The ophthalmologic apparatus is required to be able to perform a coarse movement operation for roughly aligning with the eye E and a fine movement operation for aligning the optometric part with the eye E in detail. That is, a wide alignment range and high alignment accuracy are required. Further, depending on the state of the eye to be examined, a specific part of the eye to be examined may not be detected. In addition, fixations may not be stable in pediatric eyes or inspected eyes with nystagmus. In these cases, since automatic alignment becomes difficult, a wide alignment range and high alignment accuracy are required even in manual operation.

JP 2007-4705 A JP-A-6-7292

  By the way, when the optometric part is moved greatly during the coarse movement operation, the sliding body is slid with respect to the friction plate. In this case, since the frictional force between the sliding plate and the friction plate becomes the resistance of movement of the optometry part, the friction between the sliding plate and the friction plate is necessary to move the optometry part greatly and quickly. It is preferable that the force is small. On the other hand, during the fine movement operation, it is preferable that the movement of the optometry unit accurately follows the operation of the joystick in order to precisely move the optometry unit. In this case, it is preferable that the frictional force between the sliding plate and the friction plate is large so that slip does not occur. As described above, since the preferable frictional force between the sliding member and the friction plate conflicts between the coarse operation and the fine operation, it is possible to achieve both operability in the coarse operation and the fine operation. It was difficult. Each of the above-mentioned patent documents does not disclose a configuration for achieving both operability during coarse movement operation and fine movement operation.

  In view of the above circumstances, the problem to be solved by the present invention is to provide an ophthalmologic apparatus capable of achieving both operability in the coarse movement operation and the fine movement operation of the optometry unit.

  In order to solve the above problems, an ophthalmologic apparatus according to the present invention is capable of relatively moving an optometry unit that examines an eye to be examined, a first support table that supports the optometry unit, and the first support table. And a second support base, and an operation member for moving the first support base relative to the second support base, wherein the operation member is the second support base. A friction plate provided on the first support base, and a spherical body that rolls or slides on the surface of the friction plate, and a friction force generated between the friction plate and the spherical body. A friction force changing means for changing the friction force changing means, the friction force changing means on the opposite side of the sliding member across the friction plate, and a first magnet provided on the sliding member, A second magnet movably provided with respect to the friction plate, and at least the first magnet and the second magnet One is characterized by an electromagnet.

  According to the present invention, the frictional force between the sliding member and the friction plate can be changed between the coarse movement operation and the fine movement operation. For this reason, the force required to slide the sliding member during the coarse movement operation can be reduced, and the grip force for rolling the sliding member can be increased during the fine movement operation. Therefore, it is possible to achieve both operability in the coarse movement operation and the fine movement operation of the optometry unit.

It is a figure which shows typically the structural example of a joystick mechanism. It is a figure which shows the structural example of an electromagnet unit typically. It is a figure which shows typically the basic operation | movement of a joystick mechanism. It is a figure which shows typically the structure and operation | movement of a frictional force change mechanism. It is a figure which shows the structural example of an ophthalmologic apparatus typically. It is a graph which shows typically an example of current (magnetic force) in each mode. It is a figure which shows typically the structural example of the ophthalmologic apparatus which concerns on 2nd Embodiment. It is a figure which shows the example of the observation image which a display part displays. It is a figure which shows typically the structural example of a manual operation prevention mechanism. It is a figure which shows typically the structural example of a manual operation prevention mechanism. It is a figure which shows typically the example of a structure which a spherical body and a sliding member are another members.

  Embodiments of the present invention will be described below in detail with reference to the drawings. According to the embodiment of the present invention, the frictional force between the sliding member and the friction plate can be changed between the coarse movement operation and the fine movement operation. For this reason, the frictional force between the sliding member and the friction plate can be reduced during the coarse operation, and the force required to slide the sliding portion can be reduced. Therefore, since the coarse operation can be performed with a light force, it is easy to move large and quickly, and the operability during the coarse operation is improved. On the other hand, during the fine movement operation, the frictional force between the sliding member and the friction plate can be increased to make it difficult for the sliding member to slide relative to the friction plate. For this reason, the grip force at the time of rolling a sliding member becomes large, and an optometry part will follow an operation of a joystick correctly. Therefore, the operability during the fine movement operation is improved. Thus, it is possible to achieve both operability in the coarse movement operation and the fine movement operation of the optometry unit.

  Moreover, the kind of ophthalmologic apparatus which concerns on embodiment of this invention is not specifically limited. For example, the ophthalmologic apparatus according to the embodiment of the present invention includes a measuring device such as a tonometer and a refractometer, an imaging device such as OCT, SLO, and AO-SLO, and an inspection device such as a slit lamp.

<Joystick mechanism>
First, the joystick mechanism 1 applied to the ophthalmologic apparatus according to the embodiment of the present invention will be described. The joystick mechanism 1 is used to move a movable base 54 of an ophthalmologic apparatus 5a, 5b, which will be described later, in a horizontal direction relative to a base 53 (see FIG. 5) or a manual base 73 (see FIG. 7). .

  FIG. 1 is a diagram schematically illustrating a configuration example of a joystick mechanism 1 applied to an ophthalmologic apparatus according to an embodiment of the present invention. As shown in FIG. 1, the joystick mechanism 1 includes a friction plate 12, spherical body receivers 15a and 15b, a spherical body 13 that is an example of a sliding member, an operating rod 10 that is an example of an operating member, and an electromagnet unit. 32 and an electromagnet unit support portion 34. The spherical body receivers 15a, 15b, the spherical body 13, and the operating rod 10 are arranged on one surface side of the friction plate 12 (the upper surface in FIG. 1; hereinafter referred to as “upper surface”). On the other hand, the electromagnet unit 32 and the electromagnet unit support 34 are arranged on the surface side of the friction plate 12 opposite to the one surface side (the lower surface in FIG. 1; hereinafter referred to as “lower surface”). Is done. Therefore, as shown in FIG. 1, the friction plate 12 is interposed between the spherical body 13 and the electromagnet unit 32.

  The friction plate 12 is fixed to a base 53 or a manual base 73 of an ophthalmologic apparatus 5a, 5b described later. In the present embodiment, the base 53 or the manual base 73 of the ophthalmologic apparatuses 5a and 5b described later is an example of the second support base. The friction plate 12 is a flat member, and is formed of a material that transmits the magnetic force of the electromagnet unit 32 and the permanent magnet 14 and is not magnetized by the magnetic force (a material that is not affected by the magnetic field).

  The spherical body receivers 15a and 15b are provided on the movable base 54 of the ophthalmologic apparatuses 5a and 5b described later. In the present embodiment, the movable table 54 of the ophthalmologic apparatuses 5a and 5b described later is an example of the first support table. The spherical body receivers 15a and 15b have an annular configuration. The spherical body receivers 15a and 15b rotatably support the spherical body 13 in a state where the spherical body 13 is in contact with the upper surface of the friction plate 12. In the present embodiment, a configuration in which the spherical body 13 is sandwiched between the upper spherical body receiver 15a and the lower spherical body receiver 15b so as to be rotatably supported is shown, but the present invention is not limited to this configuration.

  The spherical body 13 is an example of a sliding member that rolls or slides on the upper surface of the friction plate 12. The spherical body 13 rolls (rolls) on the upper surface of the friction plate 12 and can slide without rolling. The spherical body 13 is rotatably supported by the spherical body receivers 15a and 15b.

  The spherical body 13 is provided with a permanent magnet 14 which is an example of a first magnet. The permanent magnet 14 is provided on the spherical body 13 so that one of the S pole and the N pole faces the outer peripheral side of the spherical body 13. The permanent magnet 14 is configured to face the electromagnet unit 32 with the friction plate 12 in between, even when the operating rod 10 is tilted at the maximum angle in any direction. The permanent magnet 14 has, for example, a hemispherical shape, and a configuration in which the outer surface of the hemispherical shell is one of the S pole and the N pole and the inner surface is the other pole can be applied. . The permanent magnet 14 may be provided inside the spherical body 13 or may be provided on the outer surface.

  The operating rod 10 is an example of an operating member that is operated to move the movable base 54 relative to the base 53. The operating rod 10 has, for example, a rod-like configuration and is integrally coupled with the spherical body 13. For this reason, when an examiner or the like (user) tilts the operating rod 10, the spherical body 13 rotates according to the tilt angle. The operation rod 10 may be configured to be manually operated by an examiner or the like (user), and the specific configuration is not particularly limited. A conventionally known configuration can be applied to the operation rod 10.

  The electromagnet unit 32 is an example of a second magnet, and is disposed on the opposite side of the spherical body 13 with the friction plate 12 interposed therebetween. The electromagnet unit 32 is supported by the electromagnet unit support portion 34 so as to be movable in the surface direction of the friction plate 12. FIG. 2 is a diagram schematically illustrating a configuration example of the electromagnet unit 32. 2A is a plan view, and FIG. 2B is a cross-sectional view. As shown in FIG. 2, the electromagnet unit 32 includes an annular coil 41 (solenoid) and a core member 40 disposed inside the coil 41. The coil 41 is composed of a conductive wire wound in multiple layers, and generates a magnetic field by a current flowing from the outside. The coil 41 is covered with an insulating resin 42 so that the wound conductive wire cannot be removed. The surface of the insulating resin 42 (the surface of the coil 41) is smoothly finished. The core member 40 is an example of a member that is attracted by the permanent magnet 14. The core member 40 is formed of a material that is attracted to a magnetic field, such as iron.

  Furthermore, a slip sheet 43 having a low friction coefficient and durability is attached to the surface of the coil 41 on the friction plate 12 side. For this reason, the electromagnet unit 32 can smoothly move the lower surface of the friction plate 12 in the surface direction while being in contact with the lower surface of the friction plate 12. The electromagnet unit 32 is not limited to the above-described configuration as long as the electromagnet unit 32 can smoothly move while being in contact with the lower surface of the friction plate 12. For example, the above-described slip sheet may be attached to the lower surface of the friction plate 12. Further, the above-described slip sheet may be attached to both the upper surface of the electromagnet unit 32 and the lower surface of the friction plate 12.

  The electromagnet unit support 34 supports the electromagnet unit 32 so that it does not fall and is movable in the surface direction of the friction plate 12. The electromagnet unit support 34 has, for example, a shallow tray-like configuration and is attached to the lower surface of the friction plate 12. The electromagnet unit 32 is accommodated without being fixed to the electromagnet unit support 34. The electromagnet unit support 34 can move the electromagnet unit 32 over the entire movement range of the spherical body 13 with respect to the friction plate 12 (that is, the movement range of the movable base 54 with respect to the base 53 or the manual base 73). To support. In other words, regardless of the position of the spherical body 13 relative to the friction plate 12, the electromagnet unit 32 follows the movement of the spherical body 13, and the lower side of the spherical body 13 sandwiches the friction plate 12. It can move smoothly to a position (position facing the permanent magnet 14 provided on the spherical body 13).

  The electromagnet unit 32 is arranged so that one of the poles (S pole and N pole) generated by the coil 41 is located on the friction plate 12 side. For example, the coil 41 is disposed in such a posture that the center line of the coil 41 is parallel to the normal line of the lower surface of the friction plate 12.

  Next, the basic operation of the joystick mechanism 1 will be described with reference to FIG. FIG. 3 is a diagram schematically showing the basic operation of the joystick mechanism 1. FIG. 3A shows a state where the operating rod 10 is not operated and the operating rod 10 is in the neutral position. The operating rod 10 stands upright at a right angle to the friction plate 12 when not operated. When an examiner or the like (user) finely moves the movable base 54, which is an example of the first support base, with respect to the base 53 or the manual base 73, which is an example of the second support base, 10 is tilted. On the other hand, the examiner or the like moves the operating base 10 horizontally without tilting when the movable base 54 is coarsely moved with respect to the base 53 or the manual base 73. Since the spherical body receivers 15 a and 15 b are fixed to the movable base 54, the movable base 54 can be moved in the horizontal direction with respect to the base 53 or the manual base 73 by operating the operating rod 10. Thereby, the optometry part 51 (refer FIG. 5, FIG. 7) mentioned later can be moved to the to-be-tested eye E in the front-back direction and the left-right direction.

  FIG. 3B schematically shows an operation by a fine movement operation. When the movable base 54 is slightly moved with respect to the base 53 or the manual base 73, the examiner or the like moves the operation rod 10 from the state shown in FIG. 3A as shown in FIG. Tilt. When the examiner or the like applies the load T1 to the operation rod 10 and tilts it, the spherical body 13 rotates according to the tilt angle. At that time, rolling friction is generated between the spherical body 13 and the friction plate 12. That is, a frictional force μN due to static friction is generated at the contact portion between the spherical body 13 and the friction plate 12. In addition, μ is a coefficient of static friction between the spherical body 13 and the friction plate 12, and N is a reaction force against the pressing force F in the normal direction to the friction plate 12 of the spherical body 13. Thus, the frictional force μN is proportional to the pressing force F in the normal direction to the friction plate 12 of the spherical body 13. Therefore, the frictional force μM can be changed by changing the pressing force F.

  When the operating rod 10 is tilted, the spherical body 13 rolls without rolling on the upper surface of the friction plate 12 due to the frictional force between the spherical body 13 and the friction plate 12. The movable base 54 moves in the horizontal direction relative to the base 53 or the manual base 73 by the rolling of the spherical body 13. The amount of movement of the movable base 54 in the horizontal direction is determined by the amount of rolling of the spherical body 13 (that is, the tilt angle of the operating rod 10). For example, by designing the tilt angle of the spherical body 13 and the size of the spherical body 13 so that the horizontal movement amount of the movable platform 54 when the operating rod 10 is tilted is about 1/10 mm, the accuracy can be improved. High alignment is possible. Thus, the examiner or the like can perform a fine movement operation of the movable base 54 (that is, the optometry unit 51) by tilting the operation rod 10.

  FIG. 3C schematically shows an operation by the coarse operation. When the movable base 54 is coarsely moved with respect to the base 53 or the manual base 73, an examiner or the like (user) moves the operation rod 10 as shown in FIG. ) Move horizontally from the state shown in (1). When a horizontal load exceeding the frictional force μN due to static friction is applied to the operating rod 10, the operating rod 10 tilts to some extent, but the spherical body 13 slides on the surface of the friction plate 12. For this reason, the movable base 54 moves horizontally relative to the direction of the applied load with respect to the base 53 or the manual base 73. Note that the examiner or the like does not tilt the operating rod 10 but moves the operating rod 10 in the horizontal direction to perform the coarse moving operation of the movable base 54. In this case, a frictional force D due to dynamic friction is generated between the spherical body 13 and the friction plate 12.

  As described above, two types of frictional forces are generated between the spherical body 13 and the friction plate 12, that is, a frictional force due to static friction and a frictional force due to dynamic friction. In the fine movement operation, if the frictional force μN due to static friction is small, the operation of the operating rod 10 becomes light. However, if the frictional force μN is excessively small, the spherical body 13 is liable to idle on the surface of the friction plate 12 in the fine movement operation, and there is a possibility that accurate positioning cannot be performed. For this reason, in the fine movement operation, if the frictional force μN is too small, the operability is lowered. On the other hand, in the coarse movement operation, this frictional force becomes a resistance to the movement of the movable table 54, and it is necessary to apply a load larger than the frictional force μN to the spherical body 13. For this reason, in the coarse operation, when the frictional force μN is increased, the force required for the coarse operation is also increased, and the operability is deteriorated.

  Therefore, in this embodiment, the frictional force μN is increased during the fine movement operation, and the frictional force μN is decreased during the coarse movement operation. Thereby, it is possible to improve the operability in both the fine movement operation and the coarse movement operation. Further, it is possible to achieve both operability during the fine movement operation and during the coarse movement operation.

  4A and 4B are diagrams schematically showing a configuration example and an operation example of a friction force changing mechanism that changes the friction force μN between the spherical body 13 and the friction plate 12. In the present embodiment, the permanent magnet 14 provided on the spherical body 13 and the electromagnet unit 32 function as a frictional force changing mechanism that changes the frictional force between the spherical body 13 and the friction plate 12. As shown in FIGS. 4A and 4B, the spherical body 13 is in contact with the upper surface of the friction plate 12, and an electromagnet unit 32 is disposed on the opposite side of the spherical body 13 across the friction plate 12. . Thus, the friction plate 12 is interposed between the spherical body 13 and the electromagnet unit 32. As shown in FIGS. 4A and 4B, the permanent magnet 14 provided on the spherical body 13 is divided into an S pole and an N pole on the surface side and the center side of the spherical body 13, and from the N pole to the S pole. An infinite number of magnetic fluxes are generated. On the other hand, when a current is passed through the coil 41 of the electromagnet unit 32, a magnetic field is generated according to Ampere's law, the core member 40 (iron core) is magnetized, and an N pole and an S pole are generated. Then, as shown in FIG. 4, for example, a magnetic force P that attracts the south pole of the electromagnet unit 32 and the north pole of the permanent magnet 14 is generated.

  When the electromagnet unit 32 and the permanent magnet 14 are attracted to each other by the magnetic force P, a load PH (the operation rod 10 is set in the horizontal direction) between the spherical body 13 and the friction plate 12 due to the magnetic force P. A frictional force F1 is generated in the opposite direction to the force to be moved. Since the magnetic force P increases as the current flowing through the coil 41 increases, the frictional force F1 also increases.

  FIG. 4B schematically shows rolling friction between the spherical body 13 and the friction plate 12. When the spherical body 13 rolls on the upper surface of the friction plate 12, a frictional force F2 due to the magnetic force P is generated. Thereby, the grip force of rolling of the spherical body 13 with respect to the friction plate 12 is increased, and the load (fine movement operation force) required for tilting the operation rod 10 is increased. For this reason, at the time of fine movement operation, by increasing the current passed through the coil 41, an appropriate grip force is generated, and the followability can be improved. The electric current can be further increased, and the operating rod 10 can be temporarily fixed to the friction plate 12.

  Based on such a principle, in the friction force changing mechanism of the present embodiment, the friction generated between the spherical body 13 and the friction plate 12 is changed by changing the current flowing through the coil 41 during the fine movement operation and during the coarse movement operation. Change power. In particular, the current flowing through the coil 41 during the coarse movement operation is made smaller than that during the fine movement operation. As a result, the frictional force caused by dynamic friction generated between the spherical body 13 and the friction plate 12 during the coarse movement operation is reduced. That is, during the coarse motion operation, a current is passed through the coil 41 to generate a frictional force due to dynamic friction between the spherical body 13 and the friction plate 12. At this time, a very weak magnetic force is generated by making the current flowing through the coil 41 smaller (for example, substantially zero or weak) than that during the fine movement operation. Thereby, the frictional force due to the dynamic friction generated between the spherical body 13 and the friction plate 12 is reduced, and the operating rod 10 is easily moved in the horizontal direction during the coarse movement operation. In addition, when the weight of the optometry unit 51 is relatively small and the frictional force between the spherical body 13 and the friction plate 12 due to gravity is excessively small, an appropriate frictional force can be applied. Therefore, it is possible to improve the operability of the operating rod 10 during the coarse movement operation. Further, the current flowing through the coil 41 may be zero during the coarse movement operation. In this case, since the core member 40 of the electromagnet unit 32 attracts the permanent magnet 14 provided on the spherical body 13, the electromagnet unit 32 moves following the spherical body 13. For this reason, even if the spherical body 13 moves to any position in the coarse movement range, it can follow.

  On the other hand, during the fine movement operation, the current flowing through the coil 41 is increased as compared with the coarse movement operation. Thereby, when the operating rod 10 is tilted, a frictional force (rolling friction) due to static friction is generated between the spherical body 13 and the friction plate 12. By increasing the current flowing through the coil 41, this frictional force is increased, and the spherical body 13 is prevented from idling on the surface of the friction plate 12 in the fine movement operation. For this reason, it becomes possible to perform highly accurate positioning during fine movement operation. Further, the operating rod 10 can be temporarily fixed to the friction plate 12 by further increasing the current.

  In the above-described embodiment, a configuration in which a permanent magnet is applied to the magnet (first magnet) provided on the spherical body 13 and an electromagnet is applied to the second magnet provided on the opposite side of the friction plate 12 is shown. However, it is not limited to this configuration. For example, the spherical body 13 may be provided with an electromagnet, and the permanent magnet may be provided on the opposite side of the friction plate 12. Moreover, the structure by which an electromagnet is provided in the spherical body 13 and the other side of the friction board 12 may be sufficient. The point is that at least one of the electromagnets can adjust the magnetic field (magnetic force).

  Furthermore, in the above-described embodiment, the configuration in which the frictional force generated between the spherical body 13 and the friction plate 12 is changed by the magnetic force is shown, but the present invention is not limited to such a configuration. That is, any configuration that can change the above-described frictional force may be used, and a configuration other than an electromagnet or a permanent magnet may be applied. Moreover, although the above-mentioned embodiment showed the structure which changes the above-mentioned friction force by changing the normal direction pressing force F of the spherical body 13 to the friction board 12 with a magnetic force, it is limited to such a structure. Not. For example, the structure which changes the above-mentioned frictional force by changing the friction coefficient between the spherical body 13 and the friction plate 12 may be sufficient.

(Ophthalmologic apparatus (first embodiment))
Next, a configuration example of an ophthalmologic apparatus to which the above-described joystick mechanism 1 is applied will be described with reference to FIG. FIG. 5 is a diagram schematically illustrating a configuration example of the ophthalmologic apparatus 5a according to the embodiment of the present invention. As shown in FIG. 5, the ophthalmologic apparatus 5 a includes a joystick mechanism 1, an optometry unit 51, a display unit 52, a vertical movement unit 55, a movable table 54, a base 53, and a system control unit 500. .

The optometry unit 51 has an optical system for photographing and optometry of the eye E. The configuration of the optometry unit 51 is set according to the type and configuration of the ophthalmologic apparatus 5a. For example, if the ophthalmologic apparatus 5a is a tonometer or a refractometer, the optometry unit 51 has an optical system for measuring intraocular pressure and eye refractive power of the eye to be examined. If the ophthalmologic apparatus 5a is OCT, SLO, or AO-SLO, the optometry unit 51 has an optical system for taking an OCT image ( optical coherence tomographic image) or SLO image of the eye to be examined. If the ophthalmologic apparatus is a slit lamp, the optometry unit 51 has a microscope. In short, the optometry unit 51 has an optical system that requires alignment with the eye to be examined in optometry. As the display unit 52, for example, a liquid crystal display device is applied, and an observation image of the eye to be inspected captured by the optometry unit 51 is displayed. A known configuration can be applied to both the optometry unit 51 and the display unit 52. Therefore, the description is omitted. The vertical movement unit 55 moves the optometry unit 51 in the vertical direction with respect to the movable table 54. Various conventionally known actuators can be applied to the vertical movement unit 55. The movable base 54 is an example of a first support base. The movable table 54 is provided on the base 53 so as to be movable in the horizontal direction, and supports the optometry unit 51 via the vertical movement unit 55. The base 53 is an example of a second support base. The base 53 is provided with a face cradle 50 for fixing the position of the subject's face.

  The spherical body receivers 15a and 15b of the joystick mechanism 1 are provided on the movable base 54 which is an example of the first support base, and the friction plate 12 is provided on the base 53 which is an example of the second support base. . For this reason, when the examiner or the like moves the operating rod 10 in the horizontal direction, the movable table 54 (optometry unit 51) can be coarsely moved in the horizontal direction with respect to the base 53. Further, when the examiner or the like (user) tilts the operation rod 10, the movable base 54 (optometry unit 51) can be finely moved in the horizontal direction with respect to the base 53. In addition, an optometry start button 74 is provided on the operation stick 10 of the joystick mechanism 1. The optometry start button 74 is an operation member for starting measurement (optometry) of the eye E. When the system control unit 500 detects an operation (for example, pressing) of the optometry start button 74, the system control unit 500 controls the optometry unit 51 to start measurement of the eye E (optometry).

  The system control unit 500 controls each part of the ophthalmologic apparatus 5a including the electromagnet unit 32 of the joystick mechanism 1 described above. For example, a computer having a CPU, a ROM, and a RAM is applied to the system control unit 500. The ROM stores a computer program for controlling each part of the ophthalmologic apparatus 5a including the joystick mechanism 1 described above. The CPU reads this computer program from the ROM and executes it using the RAM as a work area. Thereby, each part of the ophthalmologic apparatus 5a is controlled including the control of the joystick mechanism 1 described above.

  Furthermore, a current adjusting member 56 is provided in the ophthalmologic apparatus 5a. The current adjustment member 56 is an example of an operation member for adjusting the current flowing through the electromagnet unit 32. The examiner or the like operates the current adjusting member 56 to control the current flowing through the coil 41 of the electromagnet unit 32 and control (adjust) the frictional force between the spherical body 13 and the friction plate 12. 5 shows a configuration in which the current adjustment member 56 is provided on the movable base 54, but the position where the current adjustment member 56 is provided is not particularly limited. For example, the structure provided in the operating rod 10 of the joystick mechanism 1 may be sufficient. Moreover, the structure by which the current adjustment member 56 is provided in several places may be sufficient.

  The current adjusting member 56 may be configured to directly control the current flowing through the electromagnet unit 32, or may be configured to control indirectly. For example, a variable resistor may be applied to the current adjusting member 56, and the current flowing through the electromagnet unit 32 may be directly controlled (adjusted) by the variable resistor. The current adjustment member 56 is provided with a sensor that detects the operation amount, and the system control unit 500 controls (adjusts) the current that flows through the coil 41 of the electromagnet unit 32 based on the detection result of the operation amount by the sensor. It may be a configuration. That is, the system control unit 500 may function as a control unit that controls the frictional force changing mechanism.

  The operation of such an ophthalmologic apparatus 5a is as follows. The examiner or the like first fixes the subject's face to the face cradle 50. Then, the examiner operates the operation rod 10 of the joystick mechanism 1 while confirming the observation image of the eye E taken by the optometry unit 51 on the display unit 52, so that the optometry unit 51 becomes the eye E to be examined. Align (align). At this time, the examiner or the like performs alignment by horizontally moving or tilting the operation rod 10 of the joystick mechanism 1 in the horizontal direction (left-right direction and front-rear direction with respect to the eye E). On the other hand, in the vertical direction (vertical direction with respect to the eye to be examined), alignment is performed by operating the vertical movement unit 55.

  When the fixation of the eye E is unstable, the examiner and the like can perform rough alignment by a conventional method, but detailed alignment is difficult by the conventional method. For example, when the nystagmus of the eye to be examined is about 0.5 to 0.6 mm (5 to 6 mm on the screen of the display unit 52), detailed alignment becomes difficult. Therefore, in this case, the examiner or the like operates the current adjusting member 56 to increase the current flowing through the electromagnet unit 32. As a result, the gripping force of the spherical body 13 is increased when the operating rod 10 is tilted, and the followability of the optometry unit 51 can be increased during a fine movement operation. In this case, the operability is slightly heavy, but the optometry unit 51 can easily follow the eye E, so that it is easy to align the eye E with unstable fixation. When the optometry unit 51 is coarsely operated (for example, when the optometry unit 51 is moved to the opposite eye), the examiner or the like operates the current adjustment member 56 to reduce the current flowing through the electromagnet unit 32. Thereby, since the frictional force between the spherical body 13 and the friction plate 12 can be reduced, the optometry part 51 can be quickly moved in the coarse movement operation.

  In addition, the structure which can be changed continuously may be sufficient as the electric current sent through the coil 41 of the electromagnet unit 32, and the structure which can be changed in steps (discontinuously) may be sufficient. For example, the ophthalmic apparatus 5a has three modes for alignment: “coarse movement mode” that is an example of a first mode, “fine movement mode” that is an example of a second mode, and “lock (fixed) mode”. Have The “coarse movement mode”, which is an example of the first mode, is a mode in which the movable base 54 (optometry unit 51) is coarsely moved in the horizontal direction by moving the operating rod 10 in the horizontal direction. The “fine movement mode” that is an example of the second mode is a mode in which the movable base 54 (optometry unit 51) is finely moved in the horizontal direction by tilting the operation rod 10. The “lock mode” is a mode in which the movable base 54 (the optometry unit 51) is locked (fixed) so as not to move.

  A changeover switch having a position corresponding to three modes of “coarse movement mode”, “fine movement mode”, and “lock (fixed) mode” is applied to the current adjustment member 56. When the current adjustment member 56 is switched to the “coarse movement mode”, the current flowing through the electromagnet unit 32 is the smallest, and when the current adjustment member 56 is switched to the “lock (fixed) mode”, the current is passed through the electromagnet unit 32. It is configured to have the largest current. Further, when the mode is switched to the “fine movement mode”, a current intermediate between the “coarse movement mode” and the “fine movement mode” flows. According to such a configuration, in the “coarse motion mode”, the frictional force becomes the smallest, so that the operability of the coarse motion operation is improved. In the “lock mode”, the frictional force is the largest, so that the spherical body 13 is prevented from rolling and sliding. That is, the spherical body 13 is temporarily fixed to the friction plate 12. In the “fine movement mode”, since the frictional force is larger than that in the “coarse movement mode”, the grip force is increased and the operability of the fine movement operation is improved. Note that the system control unit 500 may control (adjust) the current flowing through the electromagnet unit 32 as described above according to each of the modes.

  Furthermore, the structure which can change the electric current sent through the electromagnet unit 32 also in each mode may be sufficient. FIG. 6 is a graph schematically showing an example of current (magnetic force) in each mode. For example, as shown in FIG. 6A, the current flowing through the coil 41 of the electromagnet unit 32 may be changed from the reference value S0 (initial value) in each of the “coarse movement mode” and the “fine movement mode”. . S1 is a pattern in which the magnetic force (frictional force) is larger than the reference value in both the “coarse motion mode” and the “fine motion mode”. S2 is a pattern in which the magnetic force (frictional force) is made smaller than the reference value in both the “coarse motion mode” and the “fine motion mode”. These patterns can change the overall operability. Further, as shown in FIG. 6B, the current value in the “coarse movement mode” is not changed from the reference value K0, and only the current value in the “fine movement mode” can be changed as shown in K1 and K2. May be. The pattern shown in FIG. 6B is used, for example, when it is desired to improve follow-up performance during a fine movement operation. Note that the system control unit 500 may control (adjust) the current that flows through the coil 41 of the electromagnet unit 32 as described above according to the setting of the examiner or the like.

  The above-described embodiment shows a configuration in which the movable base 54 is temporarily fixed by increasing the current flowing through the coil 41 of the electromagnet unit 32 to increase the magnetic force and fixing the spherical body 13 to the friction plate 12. However, it is not limited to this configuration. That is, in the above-described configuration, a large amount of current must continue to flow through the electromagnet unit 32 while the movable base 54 is temporarily fixed. For this reason, power consumption increases. Therefore, a configuration in which a lock mechanism that locks the movable base 54 so as not to move with respect to the base 53 may be provided. The configuration of the lock mechanism is not particularly limited.

(Ophthalmological apparatus (second embodiment))
Next, a second embodiment of the ophthalmologic apparatus will be described. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and description is abbreviate | omitted. The ophthalmologic apparatus 5b according to the second embodiment is an example of an ophthalmologic apparatus that automatically performs alignment of the optometry unit 51 (having an auto alignment mode) by electric drive. The outline of the auto alignment of such an ophthalmologic apparatus 5b is as follows. The system control unit 500 detects the eye E by performing image recognition on the observation image of the eye to be examined photographed by the optometry unit 51. Then, a deviation amount between the detected position of the eye E and the appropriate position of the eye E is calculated in the taken observation image. Then, the optometry unit 51 is moved according to the calculated shift amount. A conventionally known method can be applied to the auto alignment. Therefore, the description is omitted.

  Note that there is a demand for manual operation even for an ophthalmologic apparatus capable of automatic alignment. For example, as described above, when the fixation of the eye E is not stable, auto-alignment may not be able to follow the nystagmus of the eye E. When the eye E is a diseased eye, the eye to be examined may not be detected by the optical detection function of the optometry unit 51. In such a case, there is a demand for manual alignment while viewing the observation image. Therefore, an ophthalmologic apparatus combining manual operation and electric drive has been developed. This embodiment is also suitable for such an ophthalmologic apparatus that combines manual operation and electric drive.

  FIG. 7 is a diagram schematically illustrating a configuration example of the ophthalmologic apparatus 5b according to the second embodiment. The ophthalmologic apparatus 5b according to the second embodiment is an ophthalmologic apparatus that combines manual operation and electric drive. As shown in FIG. 7, the ophthalmologic apparatus 5 b includes an optometry unit 51, a display unit 52, a movable base 54, a vertical movement unit 55, a manual base 73, an electric drive mechanism 71, and a base 53. Have In the second embodiment, the movable base 54 is an example of a first support base, and the manual base 73 is an example of a second support base. The movable base 54 is provided on the manual base 73 so as to be relatively movable in the horizontal direction. The manual base 73 is provided on the base 53 so as to be movable in the horizontal direction and the vertical direction. The electric drive mechanism 71 drives the manual base 73 in the horizontal direction and the vertical direction. The electric drive mechanism 71 is driven and controlled by the system control unit 500. As the electric drive mechanism 71, various known three-dimensional movement mechanisms (such as a three-dimensional stage) controlled by a computer can be applied.

  Compared with the ophthalmologic apparatus 5a according to the first embodiment, the ophthalmologic apparatus 5b according to the second embodiment includes a manual base 73 and an electric drive mechanism 71 between the movable base 54 and the base 53, and a joystick. The mechanism 1 is different in that the movable base 54 and the manual base 73 are provided. Thus, in the first embodiment, the mechanism for moving the optometry unit 51 is a one-stage mechanism, whereas in the second embodiment, it is a two-stage mechanism. In the second embodiment, the joystick mechanism 1 is used to move the movable base 54 relative to the manual base 73. Similarly to the first embodiment, the operation rod 10 of the joystick mechanism 1 is provided with an optometry start button 74. In the auto alignment mode, when the system control unit 500 detects an operation (for example, pressing) of the optometry start button 74, the system control unit 500 controls the electric drive mechanism 71 to execute auto alignment, and then controls the optometry unit 51. Then start measuring the eye (optometry).

  At the start of measurement of the eye to be examined using the ophthalmologic apparatus 5b, the optometry unit 51 is roughly aligned with the left and right eye E (for example, the right eye) of the subject. This position is the initial position. When the eye E is not shown in the observation image displayed on the display unit 52 in a state where the optometry unit 51 is in the initial position, the examiner or the like operates the operation rod 10 to move the optometry unit 51. The eye E is moved to a position where it is reflected in the observation image. At this time, the system control unit 500 stops the electric drive mechanism 71. When the eye E is reflected in the observation image by manual operation, the examiner or the like presses the optometry start button 74. When the system control unit 500 detects that the optometry start button 74 is pressed, first, an electric current is supplied to the electromagnet unit 32 to draw the spherical body 13 and the friction plate 12 together, and fix the spherical body 13 to the upper surface of the friction plate 12. . That is, an operation corresponding to the above-described “lock mode” is executed. Then, the system control unit 500 controls the electric drive mechanism 71 and starts auto alignment.

  FIG. 8 shows an example of an observation image displayed by the display unit 52. FIG. 8A shows a state in which the examiner or the like has been moved to a position where the eye E is reflected in the observation image by manual operation. In this state, the eye E to be examined and the cornea reflection images R1 and R2 of the two alignment indexes are shown in the observation image. A double circle C0 at the center of the screen in the observation image is an index indicating the center of optometry (that is, an appropriate alignment position). From here, it is possible to perform alignment manually, and automatic alignment is also possible.

  In the case of auto alignment, the system control unit 500 first detects corneal reflection images R1 and R2 of two alignment indexes from the observation image. Then, the system control unit 500 determines whether or not the interval between the cornea reflection images R1 and R2 of the two alignment indices is a predetermined value, and the midpoint of the cornea reflection images R1 and R2 of the two alignment indices is a double circle C0. It is determined whether or not it is located. When the interval between the cornea reflection images R1 and R2 of the two alignment indexes is a predetermined value and the midpoint of the cornea reflection images R1 and R2 of the two alignment indexes is located in the double circle C0, the system The controller 500 determines that the alignment is complete.

  On the other hand, at least one of the case where the interval between the cornea reflection images R1 and R2 of the two alignment indicators is not a predetermined value and the case where the midpoint of the cornea reflection images R1 and R2 of the two alignment indicators is not located in the double circle C0. If this is true, it is determined that the alignment has not been completed. In this case, the system control unit 500 measures the amount of positional deviation in the front-rear direction between the eye E and the optometry unit 51 from the interval between the cornea reflection images R1 and R2 of the two alignment indexes. Further, the system control unit 500 measures the amount of deviation (vertical and horizontal directions) between the midpoint of the cornea reflection images R1 and R2 of the two alignment indices and the double circle C0. Then, the system control unit 500 drives and controls the electric drive mechanism 71 to move the optometry unit 51. The interval between the cornea reflection images R1 and R2 of the two alignment indicators is set to a predetermined value, and the midpoint of the cornea reflection images R1 and R2 of the two alignment indicators and the center of the double circle C0 are matched. . FIG. 8B shows a state where the alignment is completed. When the observation image is in a state as shown in FIG. 8B, the system control unit 500 determines that the alignment is completed, and starts measuring the eye E.

  The auto alignment method is not limited to the above-described method. A conventionally known method can be applied to the auto alignment method. In addition, here, the system control unit 500 has shown a configuration in which auto-alignment is started when the press of the optometry start button 74 is detected, but the trigger for starting the auto alignment is not limited to the press of the optometry start button 74. For example, the case where the pupil of the eye E is detected may be used as a trigger, and the case where the cornea reflection images R1 and R2 are detected may be used as a trigger. Depending on whether or not this alignment in this case is completed, the current flowing through the electromagnet unit 32 may be changed. For example, when the right eye measurement (optometry) is completed, the system control unit 500 changes the current flowing through the electromagnet unit 32 to a current corresponding to the “coarse movement mode”. Thereby, the examiner can move the optometry unit 51 from the right eye to the left eye by manual coarse movement operation. In this case, by reducing the frictional force due to the dynamic friction between the friction plate 12 and the spherical body 13 during coarse movement, the examiner can easily switch to the left eye.

  In the present embodiment, the movable base 54 and the manual base 73 are temporarily fixed by fixing the spherical body 13 and the friction plate 12 by the magnetic force of the electromagnet unit 32. However, the temporary fixing of the movable base 54 and the manual base 73 is not limited to this method. For example, a configuration in which a lock mechanism is provided between the manual base 73 and the movable base 54 may be used. The lock mechanism is preferably configured to be locked and unlocked by the system control unit 500. Note that the locking force by the locking mechanism generally needs to be strengthened so that fine movement operation and coarse movement operation using the operation rod 10 cannot be performed. However, in the present embodiment, the ophthalmologic apparatus 5b has a manual operation preventing mechanism 8 described later, whereby the locking force can be reduced. For this reason, it is possible to reduce the size of the lock mechanism and to arrange it in a small space.

  Moreover, you may have the structure which prevents manual alignment during execution of auto alignment. For example, if manual operation is performed during execution of auto alignment, auto alignment cannot be continued. For this reason, it is preferable that auto alignment is performed in a state where manual alignment is not possible. However, since the operation rod 10 is provided at a position close to the examiner or the like, the examiner or the like may contact the operation rod 10 by mistake. Therefore, in the present embodiment, a mechanism (manual operation preventing mechanism) may be provided that does not affect the operation of auto alignment even if the operating rod 10 tilts during execution of auto alignment.

  Here, a configuration example of the manual operation preventing mechanism 8 will be described with reference to FIGS. 9 and 10. 9 and 10 are diagrams schematically illustrating a configuration example of the manual operation preventing mechanism 8. As shown in FIGS. 9 and 10, the manual operation preventing mechanism 8 includes movable spherical body receivers 81 and 82, a motor 86, a feed screw 87, and an urging member 88. The movable spherical body receivers 81 and 82 have a configuration in which the upper spherical body receiver 15a is divided into two parts in plan view. One movable spherical body receiver 81 is provided with a motor 86. The motor 86 is a driving force source of the manual operation preventing mechanism 8 and operates according to the control of the system control unit 500. The rotation output shaft of the motor 86 is a feed screw 87 (male screw). The other movable spherical body receiver 82 is provided with a nut 85. The feed screw 87 and the nut 85 are screwed together. For this reason, when the motor 86 operates and the feed screw 87 rotates, the two movable spherical body receivers 81 and 82 approach or move away according to the rotation direction of the feed screw 87. The urging member 88 is provided so as to straddle between the two movable spherical body receivers 81 and 82, and urges the two movable spherical body receivers 81 and 82 in a direction away from each other.

  During the execution of the auto alignment, the system control unit 500 locks the manual base 73 and the movable base 54 by the lock mechanism and drives the motor 86 of the manual operation preventing mechanism 8 to move the movable spherical body receiver 81, Open 82 intervals. Then, as shown in FIG. 9, a gap Δ is formed between the spherical body 13 and the movable spherical body receivers 81 and 82. Further, the system control unit 500 supplies a current to the electromagnet unit 32 so as to generate a magnetic field in a direction repelling the permanent magnet 14 of the spherical body 13. Thereby, a repulsive force Z is generated between the permanent magnet 14 and the electromagnet unit 32, and the spherical body 13 can be floated from the friction plate 12. When the spherical body 13 is lifted from the friction plate 12 (not in contact), even if the operating rod 10 is tilted and the spherical body 13 rotates, the spherical body 13 only idles. Therefore, the auto alignment operation is not affected. The spherical body 13 may not be in a floating state. That is, it is only necessary that the frictional force between the spherical body 13 and the friction plate 12 can be reduced to such an extent that the spherical body 13 cannot grip the upper surface of the friction plate 12.

  Furthermore, a configuration in which another magnet 90 different from the permanent magnet 14 is provided vertically below the spherical body 13 may be employed. The magnet 90 is provided so that the direction of the pole is opposite to that of the permanent magnet 14. With such a configuration, when the spherical body 13 is floated by the repulsive force Z, the magnet 90 and the electromagnet unit 32 are attracted to each other. For this reason, it is possible to return the operating rod 10 to an upright posture while the spherical body 13 is floating. This makes it easier to operate the next manual operation.

  As mentioned above, although each embodiment of this invention was described in detail with reference to drawings, each said embodiment only showed the specific example in implementation of this invention. The technical scope of the present invention is not limited to the above embodiments. The present invention can be variously modified without departing from the spirit thereof, and these are also included in the technical scope of the present invention.

  For example, in each of the above-described embodiments, the configuration in which the permanent magnet 14 is provided on the spherical body 13 and the electromagnet unit 32 is disposed on the lower side of the friction plate 12 is shown, but the configuration is not limited thereto. For example, the electromagnet unit 32 may be provided on the spherical body 13 and the permanent magnet 14 may be disposed below the friction plate 12. Moreover, the structure which arrange | positions the electromagnet unit 32 to both the spherical body 13 and the lower side of the friction board 12 may be sufficient. That is, the electromagnet may be provided on at least one of the lower side of the spherical body 13 and the friction plate 12. With such a configuration, the frictional force between the spherical body 13 and the friction plate 12 can be controlled. Further, when the electromagnet is provided on both the spherical body 13 and the lower side of the friction plate 12, a finer control of the magnetic force (friction force) is possible.

  Further, in each of the above-described embodiments, the spherical body 13 is an example of a sliding member, and the configuration in which the spherical body 13 is rotatably supported by the spherical body receivers 15a and 15b has been described. However, the present invention is limited to such a configuration. Not. FIG. 11 is a diagram schematically illustrating an example of a configuration in which the spherical body 13 and the sliding member 102 are separate members. As shown in FIG. 11, the joystick mechanism 1 may have a configuration including a spherical body 101 and a sliding member 102 that is separate from the spherical body 101. In this case, the operating rod 10 is integrally coupled to the spherical body 101, and the spherical body 101 is rotatably supported by the spherical body support portions 16 a and 16 b provided on the movable base 54. Thereby, the examiner or the like can tilt the operation rod 10. A connecting arm 103 extending downward from the spherical body 101 is provided, and the sliding member 102 is engaged with or fixed to the connecting arm 103. FIG. 11A shows a configuration in which the sliding member 102 is engaged with the connecting arm 103, and FIG. 11B shows a configuration in which the sliding member 102 is fixed to the connecting arm 103. The sliding member 102 has a spherical surface, and this spherical surface is in contact with the friction plate 12. The sliding member 102 is provided with a permanent magnet 14 or an electromagnet unit. The configuration of the permanent magnet 14 or the electromagnet unit is as described above. When the operating rod 10 is tilted, the spherical surface of the sliding member 102 rolls on the upper surface of the friction plate 12. On the other hand, when a horizontal load is applied to the operating rod 10, the spherical surface of the sliding member 102 slides on the upper surface of the friction plate 12. Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.

  Moreover, the kind of ophthalmologic apparatus which can apply this invention is not specifically limited. For example, the present invention can be applied to various ophthalmic apparatuses such as a measuring device such as a tonometer and a refractometer, an imaging device such as OCT, SLO, and AO-SLO, and an inspection device such as a slit lamp. And the optometry part of an ophthalmologic apparatus has the structure according to the kind of ophthalmologic apparatus.

(Other embodiments)
Although the embodiment has been described in detail above, the present invention can take an embodiment as a system, apparatus, method, program, recording medium (storage medium), or the like. Specifically, the present invention may be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, an imaging device, a web application, etc.), or may be applied to a device composed of a single device. good.

  The object of the present invention can also be achieved by the following configuration. That is, a recording medium (or storage medium) that records a program code (computer program) of software that implements the functions of the above-described embodiments is supplied to the system or apparatus. Needless to say, such a storage medium is a computer-readable storage medium. Then, the computer (or CPU or MPU) of the system or apparatus reads and executes the program code stored in the recording medium. In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium on which the program code is recorded constitutes the present invention.

Claims (17)

An optometry section for optometry of the eye to be examined;
A first support for supporting the optometry unit;
A second support that supports the first support so as to be relatively movable;
An operation member for moving the first support base relative to the second support base;
Have
The operating member is
A friction plate provided on the second support;
A sliding member that is rotatable on the first support and rolls or slides on the surface of the friction plate;
Friction force changing means for changing the friction force generated between the friction plate and the sliding member;
An ophthalmologic apparatus comprising:   The ophthalmologic apparatus according to claim 1, further comprising a control unit that controls the frictional force changing unit so as to change the frictional force according to coarse movement and fine movement of the optometry unit.   The ophthalmologic apparatus according to claim 2, wherein the control unit controls the frictional force changing unit so that the frictional force is larger in the case of the fine movement than in the case of the coarse movement. The frictional force changing means is
A first magnet provided on the sliding member;
A second magnet provided on the opposite side of the sliding member with the friction plate in between so as to be movable with respect to the friction plate;
Have
The ophthalmic apparatus according to any one of claims 1 to 3, wherein at least one of the first magnet and the second magnet is an electromagnet.   The ophthalmologic apparatus according to claim 4, wherein the second magnet is provided with a member that is attracted to the first magnet.   An annular coil is applied to the second magnet, and the member attracted to the first magnet is formed of a material attracted to a magnetic field, and is a core member disposed inside the coil. The ophthalmologic apparatus according to claim 5.   The ophthalmologic according to any one of claims 4 to 6, further comprising control means for controlling the frictional force changing means so as to change the frictional force by controlling a current flowing through the electromagnet. apparatus.   The ophthalmologic apparatus according to claim 7, wherein the control unit changes the frictional force by controlling a current flowing through the electromagnet according to a mode. A first mode in which the optometry unit is roughly aligned with the eye to be examined;
A second mode in which the optometry unit is aligned in detail with respect to the eye to be examined;
Have
9. The control unit according to claim 8, wherein when the first mode is set, the frictional force is reduced by reducing a current flowing through the electromagnet as compared with the case when the mode is the second mode. An ophthalmic device according to claim 1.   The said control means prevents rolling and sliding of the said sliding member by sending an electric current to the said electromagnet, and generating the said friction force, The any one of Claim 7 to 9 characterized by the above-mentioned. The ophthalmic device described.   The control means floats the sliding member from the friction plate by causing a current to flow through the electromagnet so that the first magnet and the second magnet repel each other, or The ophthalmologic apparatus according to claim 7, wherein a frictional force with the friction plate is reduced. An optometry section for optometry of the eye to be examined;
A first support for supporting the optometry unit;
A second support that supports the first support so as to be relatively movable;
A friction plate provided on the second support;
A sliding member that is rotatable on the first support and rolls or slides on the surface of the friction plate;
A first magnet provided on the sliding member;
A second magnet provided on the opposite side of the sliding member across the friction plate, so as to be movable with respect to the friction plate;
Control means for controlling a current passed through at least one of the first magnet and the second magnet;
An ophthalmologic apparatus comprising:   The ophthalmologic apparatus according to claim 12, wherein the control unit controls the current according to coarse movement and fine movement of the optometry unit.   The ophthalmic apparatus according to claim 13, wherein the control unit increases the current in the case of the fine movement than in the case of the coarse movement. An optometry unit that examines an eye to be examined, a first support that supports the optometry unit, a second support that supports the first support so as to be relatively movable, and the first An operation member that moves the support base relative to the second support base, and the operation member is attached to the friction plate provided on the second support base and the first support base. Control of an ophthalmologic apparatus having a sliding member that can rotate and rolls or slides on the surface of the friction plate, and a friction force changing means that changes a friction force generated between the friction plate and the sliding member A method,
Control of the ophthalmologic apparatus, wherein the frictional force changing means is controlled in accordance with coarse movement and fine movement of the optometry unit to change the frictional force generated between the friction plate and the sliding member. Method. An optometry unit that examines the eye to be examined, a first support that supports the optometry unit, a second support that supports the first support so as to be relatively movable, and the second A friction plate provided on a support base; a sliding member that is rotatable on the first support base and rolls or slides on a surface of the friction plate; and a first magnet provided on the slide member; A control method for an ophthalmologic apparatus comprising: a second magnet provided on a side opposite to the sliding member with the friction plate in between so as to be movable with respect to the friction plate,
A method for controlling an ophthalmologic apparatus, comprising: controlling a current flowing through at least one of the first magnet and the second magnet.   The program for making a computer perform the control method of the ophthalmologic apparatus of Claim 15 or 16.

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