JPS6211601Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fundus camera with an arcuate guide element.

In the case of a fundus camera, it is advantageous that the device can be moved on a spherical surface centered on the patient's eye. In this way, the entire fundus can be observed.

Fundus cameras are known which have one arc-shaped guide element, which is arranged on one side of the optics of the device, the center of which is in the patient's eye, so that this fundus camera allows the fundus to be viewed in one vertical plane. can be observed under various angles. The arcuate guide element is additionally pivotable about an axis passing perpendicularly through the patient's eye. Observations at different horizontal angles are thereby also possible, so that the fundus camera can move on a spherical surface centered on the patient's eye as a whole.

This measure requires a large amount of space and has the disadvantage that access to the device from the side of the arc guide is restricted. Furthermore, the arc guide must be designed very rigidly so that the optical device can be guided with sufficient precision and stability.

A mechanically preferred guide device for an ophthalmological device is described in GB 1122891. In this case, the ophthalmoscope is arranged slidably between two parallel arc-shaped guide elements around the patient's eye. The two guide elements are rotatable about a horizontal axis passing through the patient's eye via another support.
In this case as well, therefore, it is achieved that the ophthalmoscope moves on a spherical surface centered on the patient's eye. This optometrist is connected to a guide element via four rollers in each case. A leaf spring wrapped around another roller serves for tension relief. This device also has the disadvantage that the optical components of the device are surrounded by a guide element, requiring a large amount of space and making the device itself difficult to access.

The purpose of the present invention is to provide a stable guide device for a fundus camera that requires little space, allows access to the device from all sides, and allows accurate guidance of the fundus camera on a spherical surface centered on the patient's eye. It is to obtain.

This purpose is achieved by the invention, in which two arc-shaped guide elements running parallel to each other are arranged so as to be pivotable about a vertical axis passing through the patient's eye, and a casing enclosing the optics of the fundus camera is attached to the casing. The solution lies in that the casing is supported on guide elements passing through the guide elements and that the casing is connected to each guide element via three ball bearings lying in the plane of the respective guide element.

In particular, the arc-shaped guide element is arranged symmetrically with respect to the central plane of the device. According to an advantageous embodiment of the invention, a plastic plate is used for the lateral guidance of the housing, which slides along the vertical plane of the guide element. According to another embodiment of the invention, a rack is fastened to the at least one guide element, to which a crank gear is connected for adjusting the housing containing the optics of the fundus camera.

The advantages achieved with the invention are, inter alia, that the optical components of the device are optimally guided by a double guide, the device being very easily accessible from both sides. The device can withstand large lateral loads without affecting the operation of the crank gear. The dual guide allows each guide element to have a small cross-section and be integrated into the device. The optical path and the electrical leads can be arranged in the free space between the guide elements. Furthermore, the symmetrical arrangement of the guide elements within the casing provides a favorable appearance for the entire device.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an optical member 4 of a fundus camera,
This member can pivot on a spherical surface centered on the patient's eye 11. The optical element 4 is surrounded by a casing 12 which is connected via a ball bearing 5 to the circular guide element 1 . The guide elements 1, which are arranged parallel to each other, run through the casing 12, as shown in particular in FIG. 2, and the connecting line of their central point passes through the patient's eye. Guide element 1 is leg 1
4 is fixedly connected to a member 2 which is rotatably supported around a vertical axis 13 by a screw 3. The axis 13 passes through the patient's eye 11, so that the fundus camera is oriented exactly toward the patient's eye even when pivoted out of the plane of the drawing.

On each guide element 1 rolls three ball bearings 5 which are connected to a holder 6 and to the casing 12 by two screws 7 each. By sliding the holder 6 carrying the ball bearing 5 against the guide element 1, the casing 12 with the optical system 4 is adjusted relative to the center point of the guide element 1.

A rack 9 screwed onto the guide element 1 is shown in FIGS. 1 and 2. FIG. By means of the crank gear 8, which is connected to the rack 9 via a gear 16, the housing 12 with the optical system 4 can be pivoted about the center of the guide element 1 and thus about the patient's eye 11. The casing 12 is laterally guided by a plastic plate 10 which slides along the vertical surface 17 of the guide element 1.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a fundus camera having an arc-shaped guide element, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1. 1...Guide element, 4...Optical member, 5......
Ball bearing, 8...Crank gear, 11...
...patient's eye, 12...casing.

Claims (1)

[Claims for Utility Model Registration] 1. In a fundus camera having arcuate guide elements, two arcuate guide elements parallel to each other 1
However, the vertical axis 13 passing through the patient's eye 11
A casing 12 which is rotatably arranged around the center and which surrounds the optical element 4 of the fundus camera is supported by a guide element 1 passing through the casing 12, such that the casing is in the plane of the respective guide element 1 and the respective guide element 1. A fundus camera that is connected via three ball bearings 5. 2. The camera according to claim 1, wherein the arc-shaped guide element 1 is arranged symmetrically with respect to the central plane 15 of the casing 12. 3. Camera according to claim 1 or 2, in which a plastic disc 10 is arranged as a lateral guide of the casing 12, sliding along the vertical surface 17 of the arc-shaped guide element 1. 4 A rack 9 is fastened to at least one arc-shaped guide element 1 and a crank gear 8 for adjusting the housing 12 of the optical element 4 is attached to this rack.
A camera according to one of claims 1 to 3 of the utility model registration claims, in which these are combined.