JPH07121256B2 - Photography camera mounting adapter for fundus camera - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic camera mounting adapter for a fundus camera, and more specifically, to a retinal camera that exposes two photographic cameras with different photographic magnifications from one photographic light flux. The present invention relates to a photographing camera mounting adapter for a fundus camera to be attached to the.

(Prior Art) In a conventional fundus camera, both adapters for attaching two photographing cameras in addition to the main camera, which is a 35 mm camera, are both instant cameras, and the film is color or black and white. There were many In this case, the photographing magnifications of both photographing cameras are the same, and it is not necessary to insert or remove the imaging lens in conjunction with the switching of the optical path switching mirror.

However, there is a demand to attach a 35 mm camera and an instant camera in consideration of the time required to process a photograph and the ease of copying. In this case, the shooting magnification must be changed due to the difference in film size. Therefore, if an imaging lens with a different magnification is to be placed behind the switching mirror, the optical system for a high-magnification instant camera becomes long and There was a problem that the camera mounting adapter became large.

In addition, for the above-mentioned two instant cameras that have been manufactured conventionally, if you use the shooting camera mounting adapter in which the high-magnification imaging lens is arranged in front of the switching mirror, it is possible to use it for low-magnification 35 mm cameras. The problem that the optical system becomes long occurs.

(Problems to be Solved by the Present Invention) The present invention has been made in view of the problem that the conventional adapter for mounting a photographing camera becomes large in size, and is small in size, and is linked to the switching of the switching mirror. It is an object of the present invention to provide a photographing camera mounting adapter in which a high-magnification imaging lens is automatically inserted and removed.

(Structure of the Invention) In the present invention to achieve the above object, in a photographing camera mounting adapter for a fundus camera for mounting a plurality of cameras which receive light at different photographing magnifications to a fundus camera, in order to switch the optical paths to the plurality of cameras. And a magnification changing means for changing the photographing magnification according to the movement of the switching means.

(Effect of the Invention) According to the present invention, it is possible to obtain a photographing camera mounting adapter which is small in size and which is capable of automatically inserting and removing the high-magnification imaging lens in association with the switching of the switching mirror. .

(Example) Hereinafter, the Example of this invention is described based on drawing. As shown in FIG. 2, the optical system of the fundus camera 1 of the embodiment includes an illumination system 10, an imaging optical system 20 arranged orthogonal to the illumination system 10 and facing the eye E to be inspected, and an imaging optical system. A branch reflection system 40 arranged on the optical axis 22 of the system 20, a first photographing system, that is, a 35 mm camera 60 arranged on the optical axis 22 behind the branch reflection system 40, and a molecular reflection system. Second placed on the reflected optical axis 42 of 40
It consists of a shooting system 80.

The illumination system 10 is for illuminating the fundus F of the eye E to be observed and photographed, and includes an observation light source 14, a condenser lens 15, a photographing light source 16, a first relay lens 17, on the optical axis 12.
The ring slit 18 and the second relay lens 19 are sequentially arranged,
Further, a perforated mirror 23 is arranged at the intersection of the optical axes 12 and 22.
The observation light source 14 and the photographing light source 16 are condenser lenses.
It is provided so as to be conjugate with respect to 15, and the perforated mirror 23 is the second
The relay lens 19 is provided so as to be conjugate with the ring slit 18.

The illumination system 10 is the observation light source 14 or the photographing light source in the above configuration.
The illumination light emitted by 16 is transmitted through the ring slit 18,
The light is reflected by the perforated mirror 23 and guided to the eye E to be inspected through the objective lens 24 described later to illuminate the fundus F.

The imaging optical system 20 is for forming an image of the fundus F of the eye to be inspected illuminated by the illumination system 10, and is an objective lens arranged on the optical axis 22 on the eye E side with respect to the perforated mirror 23. twenty four
And the diaphragms sequentially arranged on the optical axis 22 on the side opposite to the eye E to be inspected.
25, a focusing lens 26, a variable magnification Kens system 27, and an imaging lens 30.

The objective lens 24 is arranged so that the aperture mirror 23 and the pupil P of the eye E to be examined are conjugated. The focusing lens 26 is movably arranged on the optical axis 22 for focusing the fundus image. The variable power lens system 27 is configured to selectively arrange a plurality of variable power lenses 28 and 29 on the optical axis 22 in order to change the imaging magnification of the fundus image. The image of the fundus F of the eye to be inspected is formed at the position 32 by the objective lens 24, and then the focusing lens 26 and the variable power lens system.
27, an image is formed on the film 62 of the 35 mm camera 60 by the image forming lens 30.

The branch reflection system 40 consists of a total reflection mirror 44 and a 35 mm camera 60.
The total reflection mirror 44 is detached from the optical axis 22 when observing and photographing by, and the total reflection mirror 44 is obliquely provided on the optical axis 22 when photographing by the second photographing system 80.

The 35 mm camera 60 is a flip-up mirror sequentially arranged on the optical axis 22.
66, shutter 68, 35 mm film 62, focus glass 70 sequentially arranged on the reflection optical axis 74 of the flip-up mirror 66, reflector
It consists of 72 and eyepiece lens 76. 35 configured in this way
When observing the millimeter camera 60 for focusing, determining a visual field, etc., the flip-up mirror 66 is obliquely installed on the optical axis 22 and a fundus image is formed on the focus glass 70, which is passed through the eyepiece lens 76. Observed. On the other hand, at the time of photographing, the flip-up mirror 66 is separated from the optical axis 22, the shutter 68 is opened, and the 35 mm film 62 is exposed.

The second photographing system 80, as shown in FIG. 1, is a camera mounting adapter 30 arranged on the reflection optical axis 42 of the branch reflection system 40.
0, and an instant film box 302 arranged behind the camera mounting adapter 300 on the reflection optical axis 42,
It comprises a 35 mm camera 304 arranged on an optical axis 306 extending orthogonally from the reflected optical axis 42 from the camera mounting adapter 300.

The camera mounting adapter 300 includes a shutter 308 for the instant film and a first adapter imaging lens 312 with a shutter 308 for the instant film in order from the side of the branching reflection system 40 on the reflected optical axis 42.
And a switching mirror 314 that can be manually inserted and removed. The first adapter imaging lens 312 with the diaphragm 310 is arranged so that it can be inserted into and removed from the reflection optical axis 42. The camera mounting adapter 300 further includes a second adapter imaging lens 316 arranged on the optical axis 306. Then, the instant film 320 in the instant film box 302 is conjugated with the image forming position 88, which will be described later, with respect to the first adapter image forming lens 312, and is positioned so as to have a higher magnification than the image of the image forming position 88. The 35 mm film 322 in 304 is positioned so as to be conjugate with the image forming position 88 with respect to the second adapter image forming lens 316 and have the same magnification as the image of the image forming position 88. The 35 mm camera 304 is provided with a shutter 309 for 35 mm film.

A motor 324 for inserting / removing the reflected optical axis 42 is connected to the first adapter imaging lens 312, and a micro switch 326 for detecting the switching position is connected to the switching mirror 314, and is connected to the motor 324. Micro switch 326
Are connected to each other via a motor drive unit 328.

The second photographing system 80 described above removes the switching mirror 314 from the reflection optical axis 42 when photographing with the instant film 320,
In conjunction with this, the first adapter imaging lens 312 is inserted on the reflection optical axis 42, and the exposure is performed by the first adapter imaging lens 312. On the other hand, when photographing on the 35 mm film 322, the switching mirror 314 is inserted into the reflection optical axis 42, and in conjunction with this, the first adapter imaging lens 312 causes the reflection optical axis 42 to move.
It is removed from above and exposure is performed by the second adapter imaging lens 316.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an optical diagram of an adapter for mounting a photographing camera according to an embodiment of the present invention, and FIG. 2 is an optical diagram of a fundus camera incorporating the adapter shown in FIG. E: Eye to be inspected 1: Fundus camera 10: Illumination system 20: Imaging optical system 22: Perforated mirror 40: Divided reflection system 44: Total reflection mirror 60: First imaging system (35 mm) (Camera) 80 …… Second shooting system 300 …… Camera mounting adapter 302 …… Instant film box 304 …… 35mm film box 312 …… First adapter imaging lens 314 …… Switching mirror 316 …… Second adapter imaging lens

Claims (1)

[Claims] 1. A photographing camera mounting adapter for a fundus camera for mounting a plurality of cameras which receive light at different photographing magnifications on a fundus camera, and a switching means for switching optical paths to the plurality of cameras, and the switching means. An adapter for mounting a photographing camera for a fundus camera, which is provided with a magnification changing means for changing the photographing magnification according to the movement of the.