JPH02224729A - Ophthalmologic instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ophthalmological device, such as a fundus camera, which has a shutter mechanism for protecting an objective lens facing an eye to be examined. be.

[Prior Art] For example, in a normal fundus camera, the distance to the objective lens facing the subject's eye is short. As shown in the figure, by providing a lens barrel portion 2 protruding from the fundus camera body 1 and providing an objective lens within the lens barrel portion 2, a sufficient distance between the subject 3 and the fundus camera body 1 is maintained. There is. There is usually only a few centimeters of space between the objective lens and the patient P, and when the patient P is placed in the correct position relative to the fundus camera body 1, the patient P may accidentally Touching the lens or tearing of subject P or subject P
Saliva scattered when the person speaks sticks to the objective lens and often stains the surface of the objective lens significantly. Therefore, a separate cap 3 made of synthetic resin, rubber, etc. is provided to protect the objective lens. , it is common practice to put it on after the photo shoot is completed.

[Problems to be Solved by the Invention] However, in the conventional example described above, it is cumbersome to attach and detach the cap 3 manually, and people often forget to attach the cap 3 after taking pictures. will also be required. Furthermore, when the material of the cap 3 is synthetic resin, rubber, etc., it may attract dust in the room due to static electricity, and when the cap 3 is reattached, the dust may adhere to the objective lens.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an ophthalmologic apparatus provided with a cover that opens and closes in conjunction with the operation of the device.

[Means for Solving the Problems] In order to achieve the above object, the ophthalmological apparatus according to the present invention includes a mechanism in which a shutter is disposed in front of the objective lens, and the shutter is opened and closed in conjunction with the operating state. It is characterized by having the following.

[Operation] The ophthalmological apparatus having the above configuration protects the objective lens by disposing a shutter between the objective lens and the eye to be examined and opening and closing the shutter in conjunction with the operation of the device.

[Example] The present invention will be explained in detail based on the example illustrated in FIGS. 1 and 2.

FIG. 1 shows an embodiment in which the present invention is applied to a fundus camera, and is a block diagram of a night vision type fundus camera, and FIG. 2 is a perspective view of the external appearance of the lens barrel. Reference numeral 10 denotes a fundus camera body, in front of which a lens barrel portion 11 is provided, and an objective lens 12 inside the lens barrel portion 11 is provided.
A rotary shutter 13, which is used as an aperture of a camera, is provided in front of the camera. When the power to the fundus camera body 10 is cut off, the shutter 13 is closed by a return spring (not shown). The shutter 13 is operated by a spur gear 15. It is opened via a ring member 16 with a spur gear that has a spur gear that meshes with this spur gear 15.

The light flux from the illumination optical system 17 is reflected by the perforated mirror 18 and illuminates the fundus ET of the eye E to be examined via the objective lens 12. The infrared light reflected by the fundus Ef passes through the objective lens 12.
The light passes through the perforated mirror 18 and is observed or photographed by an observation optical system 19 and a photographing optical system 20.

In the above configuration, the stepping motor 1 is turned on in conjunction with turning on the power switch (not shown) of the fundus camera body 10.
4 is driven to rotate the ring member 16, thereby opening the shutter 13 and preparing for observation photographing. At this time, the shutter 13 is biased in a direction to close it by a return spring (not shown), but the stepping motor 1
4. Maintain its open state by electrically holding it. Then, the power to the stepping motor 14 is also cut off by turning off the power after completing the photographing, or by turning off the power after a certain period of time determined by a power saving mechanism has elapsed. As a result, the holding force of the stepping motor 14 becomes zero, so the shutter 13 is automatically closed by the return spring, and it is possible to prevent dust and the like from adhering to the objective lens 12.

In this embodiment, the state in which the shutter 13 is opened and closed is as follows:
When the power of the fundus camera body 10 is turned on and off, a case is shown in which the power is turned off after a certain period of time has elapsed, such as when using one power saving mechanism. However, after a certain period of time has elapsed after photographing, there is no problem even if the power to the fundus camera body 10 is not turned off, only the power to the stepping motor 14 is turned off, and the shutter 13 is closed.

In addition, although the above-mentioned embodiment explained the case where it was applied to a fundus camera, it goes without saying that a similar lens cap can be applied to other ophthalmological apparatuses.

[Effects of the Invention] As explained above, in the ophthalmological apparatus according to the present invention, the shutter mechanism is disposed in front of the objective lens, and the shutter can be opened and closed in conjunction with the operating state of the apparatus. Therefore, the complicated operation of attaching and detaching the cap manually as in the past is eliminated, and there is no need for a place to put the cap, resulting in space savings. Furthermore, it is possible to prevent dust and the like from adhering to the objective lens by forgetting to hang the cap and cover after photographing, and from attracting dust due to static electricity caused by the material of the cap.

[Brief Description of the Drawings] Figures 1 and 2 show an embodiment of the ophthalmological apparatus according to the present invention, and Figure 1 is a configuration diagram when applied to a fundus camera;
FIG. 2 is an external perspective view of the lens barrel, and FIG. 3 is a schematic diagram of a conventional example. 10 is a fundus camera body, 11 is a lens barrel, 12 is an objective lens, 13 is a shutter, 14 is a stepping motor, 5 is a spur gear, and 6 is a ring member with a spur gear.

Claims (1)

[Claims] 1. An ophthalmological apparatus characterized by having a shutter disposed in front of an objective lens and a mechanism for opening and closing the shutter in conjunction with an operating state.