JP4213305B2 - Ophthalmic measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmic measuring apparatus such as a keratometer, a refractometer, a refracting keratometer, or a fundus camera, and more particularly, an ophthalmic measuring apparatus having a stopper structure that can lock an ophthalmic measuring body with respect to a base. About.
[0002]
[Prior art]
As shown in the front view of FIG. 1A, this type of ophthalmic measurement apparatus is configured such that the ophthalmic measurement main body 10 is placed on the base 20 and is movable with respect to the base 20. . A stopper as shown in the enlarged partial cutaway view of the main part of FIG. 1B so that the ophthalmic measurement main body 10 does not move relative to the base 20 when the ophthalmic measurement apparatus is moved or transported. A stopper structure 30 using the pin 1 is provided between the ophthalmic measurement main body 10 and the base 20.
[0003]
1A and 1B, the ophthalmic measurement main body 10 includes elements necessary for ophthalmic measurement, such as an optical measurement unit 31, a monitor 32, a joystick 33, and an arithmetic processing unit (not shown). The bottom wall 11 facing the side is provided with a guide guide portion 12. The guide guide portion 12 accommodates the stopper pin 1 and has a through-hole for inserting and removing the tip of the stopper pin 1 on the lower wall thereof.
[0004]
As shown in the cross-sectional view of the main part of the stopper structure 30 in FIG. 2, the nut portion 22 is fixed to the first through hole 23 formed in the upper wall 21 of the base 20. An inner screw 24 is formed on the inner surface of the nut portion 22.
[0005]
As shown in FIG. 2, the stopper pin 1 has a step structure in which cylindrical bodies are stacked in multiple stages, and is mounted so as to be movable up and down within the guide guide portion 12 of the ophthalmic measurement main body 10. . The stopper pin 1 holds the operation knob 2 operated by the user, the sliding portion 3 that moves up and down while sliding on the inner surface of the guide guide portion 12, and the urging spring 7 in order from the top. , The stroke portion 4 for defining the pushing amount of the stopper pin 1, and a screw projection 5 having an outer screw 6 formed on the outer surface. Then, when releasing the lock and moving the ophthalmic measurement main body 10 forward / backward / left / right with respect to the base 20, the stopper pin 1 is lifted so that the screw protrusion 5 does not hit the upper wall 21 of the base 20, and the state is changed. Need to hold. Therefore, a biasing coil spring 7 is provided between the bottom wall 11 of the ophthalmic measurement main body 10 and the sliding portion 3 of the stopper pin 1.
[0006]
Next, a method of locking the ophthalmic measurement main body 10 with respect to the base 20 in such a stopper structure 30 will be described with reference to FIG.
[0007]
The ophthalmic measurement main body 10 is positioned so that the screw protrusion 5 of the ophthalmic measurement main body 10 corresponds to the nut portion 22 of the base 20. When the user depresses the operation knob 2 of the stopper pin 1 while resisting the spring force of the urging coil spring 7, the screw protrusion 5 provided at the lower end of the stopper pin 1 comes into contact with the inner screw 24 of the nut portion 22. Then, when the operation knob 2 is rotated while applying a downward force, the outer screw 6 of the screw projection 5 is screwed with the inner screw 24 of the nut portion 22, and the ophthalmic measurement main body 10 is locked with respect to the base 20. Become fixed. Conversely, when the user rotates the operation knob 2 in the direction opposite to that during screwing, the screwing between the screw protrusion 5 and the nut portion 22 is released. At this time, when the user releases his / her hand from the operation knob 2, the stopper pin 1 is lifted by the spring force of the urging coil spring 7, and the sliding portion 3 is locked by the stopper surface above the guide guide portion 12. Thus, the unlocked state is maintained.
[0008]
However, the stopper structure 30 has the following problems. That is, the biasing coil spring 7 for holding the stopper pin 1 in a lifted state so that the screw projection 5 of the stopper pin 1 does not come down and come into contact with the upper wall 21 of the base 20 when the lock is released. It is necessary to provide an unlocking holding means such as Providing such an unlocking holding means in the stopper structure 30 leads to an increase in the number of parts and assembly / adjustment man-hours. At the same time, since the stopper structure 30 is enlarged because it requires an installation place for the unlocking holding means, there are problems such as being limited by the installation place of the stopper structure 30 and difficulty in downsizing the apparatus. It was.
[0009]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is that an ophthalmology provided with a stopper structure that can hold an unlocked state without using an unlocking holding means such as a biasing coil spring when measuring optical characteristics. It is to provide a measuring device.
[0010]
[Means for solving the problems and actions / effects]
In order to solve the above technical problem, an ophthalmic measurement apparatus according to the present invention has the following features.
[0011]
That is, an ophthalmic measurement is provided with a base, an ophthalmic measurement main body, a stopper pin for locking the ophthalmic measurement main body with respect to the base, and a stopper pin support means for supporting the stopper pin. A first through hole is formed in the bottom wall of the main body, an internal screw is formed in the first through hole, and a second through hole is formed in the upper wall of the base at a position corresponding to the first through hole. The stopper pin is disposed so as to be vertically movable between a lock position where the stopper pin is inserted through both the first through hole and the second through hole, and an unlock position where the upper end of the stopper pin is pulled out from the first through hole, and The upper end portion is formed with an outer screw that is screwed into the inner screw of the first through hole at the time of locking, and a central blind hole is formed in the center portion of the pin from below. Central blindness In a vertical insertion portion which can be inserted from below, characterized by comprising from stopper pin receiving member for supporting the stopper pin when unlocked.
[0012]
According to the above apparatus, when the external screw that has been screwed into the internal screw of the first through hole at the time of locking is released, the stopper pin falls by its own weight, and the dropped stopper pin is supported by the stopper pin receiving member. The Therefore, the unlocked state can be held without using unlock holding means such as a biasing coil spring. Unlock holding means such as urging coil springs are not required and the stopper structure is simplified, so the number of parts and assembly / adjustment man-hours can be reduced, and the installation place is also unnecessary. It is possible to reduce the size of the apparatus without being restricted by the installation location. Further, since the vertical insertion portion can be used as a guide when the stopper pin is inserted into the first through hole and the second through hole, the insertion operation is facilitated.
[0013]
Preferably, the stopper pin receiving member is L-shaped, and further includes a support portion that extends from the base and supports the vertical insertion portion upright.
[0014]
According to the above configuration, the support portion of the stopper pin receiving member functions as a fall prevention means for receiving the stopper pin that has been dropped due to its own weight after being unlocked. The stopper pin is supported only by a support portion extending in a rod shape from the base, and the other portions are free, so the range in which the stopper pin can be gripped is extremely wide. Therefore, the stopper pin can be easily gripped, and the stopper pin mounting property is improved.
[0015]
Preferably, the upper end portion of the stopper pin exists in the second through hole in the unlock position.
[0016]
According to the above configuration, since the upper end portion and the lower end portion of the stopper pin are respectively guided by the second through hole and the vertical insertion portion, the stopper pin mounting property is further improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.
[0018]
FIG. 3A is a front view showing a stopper structure 90 provided in a refract keratometer as an ophthalmologic measuring apparatus. Each of the refractor keratometers is an ophthalmic measurement main body 50 in which an ophthalmic measurement function such as an optical measurement unit 91, a display 92, and a joystick 93 is incorporated, and a base for movably supporting the ophthalmic measurement main body 50. And a base 60 placed on a table such as a table. A stopper structure 90 is provided between the ophthalmic measurement main body 50 and the base 60 as shown in an enlarged partial cutaway view of the main part of FIG.
[0019]
FIG. 4 is a cross-sectional view of an essential part showing a stopper structure 90 provided in the ophthalmic measurement apparatus. As shown in FIG. 4, the ophthalmic measurement main body 50 has a built-in moving mechanism (not shown) that can be moved back and forth and right and left with respect to the base 60. By performing the operation, the optical measuring unit 91 is positioned so as to aim and focus on the eye to be examined. A first through hole 53 is provided in the bottom wall 51 of the ophthalmic measurement main body 50. The first through hole 53 is a hole that has a predetermined size, and an inner screw 54 is formed on the inner surface thereof.
[0020]
A guide portion 62 extending downward is provided on the upper wall 61 of the base 60 at a position corresponding to the first through hole 53 of the ophthalmic measurement main body 50. The guide part 62 includes a second through hole 63 and a first receiving surface 64 at the lower end thereof. A predetermined gap is provided between the bottom wall 51 of the ophthalmic measurement main body 50 and the upper wall 61 of the base 60 so that they do not contact each other.
[0021]
The base 60 includes a mounting recess 94 whose bottom is recessed inward to mount the stopper pin 70 to the stopper pin receiving member 80 on the side surface on the examiner side. The stopper pin receiving member 80 is formed by bending a round wire rod into a substantially L-shape, and is fixed and supported by a screw at a lower end portion of a support member 95 extending downward from the upper wall 61 of the base 60 in the horizontal direction. The extending support portion 83 and a columnar vertical insertion portion 82 extending vertically upward toward the first through hole 53 of the ophthalmic measurement main body 50 are configured.
[0022]
The stopper pin 70 as a locking means is a step structure in which cylindrical bodies are stacked in multiple stages concentrically so that the outer diameter increases downward. The stopper pin 70 having this step structure has, in order from the top, a screw protrusion 74 having an external thread 75 formed on the surface and a sliding portion 76 that slides up and down with respect to the inner surface of the guide portion 62 of the base 60. The base portion 79 is provided at least. The outer screw 75 of the upper end of the screw projection 74 is screwed with the inner screw 54 of the first through hole 53. The base portion 79 has a first stopper surface 71 at the top, and when the stopper pin 70 is lifted, the first stopper surface 71 abuts on the first receiving surface 64 of the base 60 to define the movement distance of the stopper pin 70. To do. The base 79 has a third stopper surface 73 on the bottom surface, and the stopper pin 70 is received by the stopper pin receiving member 80 when the third stopper surface 73 comes into contact with the second receiving portion 81 of the stopper pin receiving member 80. It is done. The stopper pin 70 has a central blind hole 78 at the center thereof. The center blind hole 78 is a cylindrical cavity in which the bottom surface 73 of the stopper pin 70 is opened upward, and is sized and configured to be inserted into the columnar vertical insertion portion 82.
[0023]
Next, the locking and unlocking method by the stopper structure 90 will be described with reference to FIG.
[0024]
When the optical characteristics of the eye to be examined are measured using a refractor keratometer, the stopper structure 90 is unlocked as shown in FIG. Make it move. When the refractor keratometer is not used for a while after the measurement is completed or when the refractor keratometer is moved, it is necessary to lock the ophthalmic measurement main body 50 so as not to move freely with respect to the base 60. Therefore, the user picks up the base portion 79 of the stopper pin 70 and lifts the stopper pin 70 along the vertical insertion portion 82 and the guide portion 62. After the screw projection 74 of the stopper pin 70 approaches the lower end of the first through hole 53, the stopper pin 70 is rotated until the second stopper surface 72 of the base portion 79 contacts the first receiving surface 64 of the guide portion 62. As a result, the outer screw 75 of the screw projection 74 is screwed with the inner screw 54 of the first through hole 53 as shown in FIG. 4A, and the ophthalmic measurement main body 50 is locked with respect to the base 60. Fixed.
[0025]
When the stopper pin 70 is rotated in the opposite direction, the stopper pin 70 is lowered, and at a certain position, the screwing between the outer screw 75 of the screw projection 74 and the inner screw 54 of the first through hole 53 is released. . When the user releases the hand holding the base portion 79 after the screwing is released, the stopper pin 70 falls by its own weight while being guided by the vertical insertion portion 82 and the guide portion 62. After that, the third stopper surface 73 of the stopper pin 70 comes into contact with the second receiving portion 81 of the stopper pin receiving member 80, and the stopper pin 70 is received by the stopper pin receiving member 80 as shown in FIG. The ophthalmic measurement main body 50 is unlocked with respect to the base 60. Thereafter, the user can freely move the ophthalmic measurement main body 50 with respect to the base 60 without the stopper pin 70 contacting the bottom wall 51 of the ophthalmic measurement main body 50.
[0026]
In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the stopper pin receiving member 80 can be configured to fix and support the support portion 83 on the side wall of the base 60 with screws. Further, the stopper pin receiving member 80 has a hook-like support having an area capable of receiving the vertical insertion portion 82 extending vertically toward the first through hole 53 of the ophthalmic measurement main body 50 and the third stopper surface 73. The support 83 can be attached to the bottom wall provided in the attachment recess 94 of the base 60. In addition, a bottom wall having a concave portion large enough to accommodate the bottom surface 73 of the base portion 79 of the stopper pin 70 is provided in the mounting concave portion 94 of the base 60 so that the vertical insertion portion 82 stands upright from the center of the concave portion. You can also
[Brief description of the drawings]
FIG. 1 shows a conventional ophthalmic measuring apparatus, (A) is a front view showing the whole apparatus, and (B) is an enlarged partial cutaway view of a main part.
2 is a cross-sectional view of a main part showing a stopper structure provided in the apparatus of FIG. 1;
FIGS. 3A and 3B show an ophthalmologic measurement apparatus according to an embodiment of the present invention, in which FIG. 3A is a front view showing the whole apparatus, and FIG.
4 is a cross-sectional view of a main part showing a stopper structure provided in the apparatus of FIG. 3; (A) shows a locked state, and (B) shows an unlocked state.
[Explanation of symbols]
50 Ophthalmic Measurement Main Body 51 Bottom Wall 53 First Through Hole 54 Internal Screw 60 Base 61 Upper Wall 62 Guide Part 63 Second Through Hole 64 First Receiving Surface 70 Stopper Pin 71 First Stopper Surface 72 Second Stopper Surface 73 Third Stopper Surface 74 Screw projection 75 External screw 76 Sliding part 78 Center blind hole 79 Base part 80 Stopper pin receiving member (stopper pin support means)
81 Second receiving portion 82 Vertical insertion portion 83 Support portion 90 Stopper structure 91 Optical measurement portion 92 Display 93 Joystick 94 Mounting recess 95 Support member

Claims (3)

A base (60), an ophthalmic measurement main body (50) that is movably mounted on the base (60), and a stopper pin (70) for locking the ophthalmic measurement main body (50) with respect to the base (60). And stopper pin support means (80) for supporting the stopper pin (70),
A first through hole (53) is formed in the bottom wall (51) of the ophthalmic measurement main body (50), and an internal screw (54) is formed in the first through hole (53).
A second through hole (63) is formed in the upper wall (61) of the base (60) at a position corresponding to the first through hole (53).
The stopper pin (70) is between a lock position where the stopper pin (70) is inserted into both the first through hole (53) and the second through hole (63) and an unlock position where the upper end portion is pulled out from the first through hole (53). An upper screw (75) is formed at the upper end portion of the first through hole (53) so as to be engaged with the inner screw (54) at the time of locking. The central blind hole (78) is formed from below,
The stopper pin support means (80) has a vertical insertion portion (82) that can be inserted into the central blind hole (78) of the stopper pin (70) from below, and supports the stopper pin (70) when unlocked. An ophthalmologic measuring apparatus comprising a stopper pin receiving member (80). The stopper pin receiving member (80) is substantially L-shaped and further comprises a support portion (83) extending from the base (60) and supporting the vertical insertion portion (82) upright. Item 3. An ophthalmologic measurement apparatus according to Item 1. The ophthalmologic measurement apparatus according to claim 2, wherein the upper end portion of the stopper pin (70) exists in the second through hole (63) at the unlock position.

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