Optical system for retinal cameras

Claim 2

An optical system for retinal cameras comprising an objective for forming a retina image of an eye to be inspected, an illuminating optical system including therein a light source to illuminate the surface of the retina, a relay lens for leading to a film surface the retina image formed by said objective, a first reflector which can switch light paths and is arranged between said relay lens and the position of the retina image focused by said relay lens, an eyepiece arranged in the light path of the light reflected by said first reflector, characterized in that said optical system further comprises at least two light path bending second reflectors which are provided between said objective and relay lens, which bend the light path from the objective and then direct it to the relay lens, and an optical element arranged between said objective and relay lens and having one of said second reflectors and a transparent part by which the light from said illuminating optical system can be passed through around said one of said second reflectors.

Claim 3

An optical system for retinal cameras according to claim 1 wherein said optical element consists of a transparent plate having a shielding part in its center and a projection projecting out of said transparent plate and having a small reflecting surface.

Claim 4

An optical system for retinal cameras according to claim 2 further comprising a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector.

Claim 5

An optical system for retinal cameras according to claim 3 further comprising a light path bending fourth reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece and a dark tube arranged between said first reflector, and fourth reflector.

Claim 6

An optical system for retinal cameras according to claim 3 further comprising a light path bending fourth reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece, a beam splitter provided between said first and fourth reflectors and a light receiving element arranged in the light path of the light divided by said beam splitter to receive it and thereby to generate a signal for effecting at least one of automatic focusing and automatic exposure controlling.

Claim 7

An optical system for retinal cameras according to claim 2 wherein said optical system further comprises a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector, one reflector arranged in the position nearest to the objective of said reflectors is made a reflector which can switch light paths, a fourth reflector which can switch light paths is further arranaged between said first reflector and eyepiece so that, by switching the one of said second reflectors made a reflector which can switch light paths and said fourth reflector, the light having passed through the objective is led directly to the eyepiece and thereby the front part of the eye to be inspected can be observed.

Claim 8

An optical system for retinal cameras according to claim 6 wherein an image rotator is arranged in the light path directed directly to the eyepiece from the objective between the one of said second reflectors made a reflector which can switch light paths and said fourth reflector.

Claim 9

An optical system for retinal cameras according to claim 7 wherein auxiliary lenses for adjusting the magnification of the pupil and the position of the image are arranged near said image rotator.

Claim 10

An optical system for retinal cameras according to claim 6 further comprising a dark tube arranged between said first reflector and fourth reflector.

Claim 11

An optical system for retinal cameras according to claim 6 further comprising a beam splitter provided between said first and fourth reflectors and a light receiving element arranged in the light path of the light divided by said beam splitter to receive it and thereby to generate a signal for effecting at least one of automatic focusing and automatic exposure controlling.

Claim 12

An optical system for retinal cameras according to claim 2 further comprising a light path bending third reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece.

Claim 13

An optical system for retinal cameras according to claim 1 wherein said optical element consists of a transparent plate shielded by leaving an annular transparent part and a projection projecting out of said transparent plate and having a small reflecting surface.

Claim 14

An optical system for retinal cameras according to claim 12 further comprising a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector.

Claim 15

An optical system for retinal cameras according to claim 13 further comprising a light path bending fourth reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece and a dark tube arranged between said first reflector and fourth reflector.

Claim 16

An optical system for retinal cameras according to claim 13 further comprising a light path bending fourth reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece, a beam splitter provided between said first and fourth reflectors and a light receiving element arranged in the light path of the light divided by said beam splitter to receive it and thereby to generate a signal for effecting at least one of automatic focusing and automatic exposure controlling.

Claim 17

An optical system for retinal cameras according to claim 12 wherein said optical system further comprises a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector, one reflector arranged in the position nearest to the objective of said second reflectors is made a reflector which can switch light paths, a fourth reflector which can switch light paths is further arranged between said first reflector and eyepiece so that, by switching the one of said second reflectors made a reflector which can switch light paths and said fourth reflector, the light having passed through the objective is led directly to the eyepiece and thereby the front part of the eye to be inspected can be observed.

Claim 18

An optical system for retinal cameras according to claim 16 wherein an image rotator is arranged in the light path directed directly to the eyepiece from the objective between the one of said reflectors made a reflector which can switch light paths and said fourth reflector.

Claim 19

An optical system for retinal cameras according to claim 17 wherein auxiliary lenses for adjusting the magnification of the pupil and the position of the image are arranged near said image rotator.

Claim 20

An optical system for retinal cameras according to claim 16 wherein auxiliary lenses for adjusting the magnification of the pupil and the position of the image are arranged near said image rotator.

Claim 21

An optical system for retinal cameras according to claim 12 further comprising a light path bending third reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece.

Claim 22

An optical system for retinal cameras according to claim 1 further comprising a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector.

Claim 23

An optical system for retinal cameras according to claim 1 wherein said optical system further comprises a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector, and a fourth reflector which can switch light paths and is arranged between said first reflector and eyepiece, the one reflector arranged in the position nearest to the objective of said second reflectors being able to switch light paths, and whereby the light having passed through the objective is led directly to the eyepiece by switching said one of said second reflectors and said fourth reflector and thereby the front part of the eye to be inspected can be observed.

Claim 24

An optical system for retinal cameras according to claim 22 wherein an image rotator is arranged in the light path directed directly to the eyepiece from the objective between the one of said second reflectors made a reflector which can switch light paths and said fourth reflector.

Claim 25

An optical system for retinal cameras according to claim 22 further comprising a dark tube arranged between said first reflector and fourth reflector.

Claim 26

An optical system for retinal cameras according to claim 24 wherein said illuminating optical system is arranged in a zone enclosed with the light path bent by said second reflectors and the light path of the light reflected by said first reflector to be directed to said eyepiece.

Claim 27

An optical system for retinal cameras according to claim 22 further comprising a beam splitter provided between said first and fifth reflectors and a light receiving element arranged in the light path of the light divided by said beam splitter to receive it and thereby to generate a signal for effecting at least one of automatic focusing and automatic exposure controlling.

Claim 28

An optical system for retinal cameras according to claim 1 further comprising a light path bending third reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece.

Claim 29

An optical system for retinal cameras comprising an objective for forming a retina image of an eye to be inspected, an illuminating optical system including therein a light source to illuminate the surface of the retina, a relay lens for leading to a film surface the retina image formed by said objective, a first reflector which can switch light paths and is arranged between said relay lens and the position of the retina image focused by said relay lens, an eyepiece arranged in the light path of the light reflected by said first reflector, characterized in that said optical system further comprises at least two light path bending second reflectors which are provided between said objective and relay lens, which bend the light path from the objective and then direct it to the relay lens, and a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and a monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths swithced by said third reflector.

Claim 30

An optical system for retinal cameras comprising an objective for forming a retina image of an eye to be inspected, an illuminating optical system including therein a light source to illuminate the surface of the retina, a relay lens for leading to a film surface the retina image formed by said objective, a first reflector which can switch light paths and is arranged between said relay lens and the position of the retina image focused by said relay lens, an eyepiece arranged in the light path of the light reflected by said first reflector, characterized in that said optical system further comprises at least two light path bending second reflectors which are provided between said objective and relay lens, which bend the light path from the objective and then direct it to the relay lens, and a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and a monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths swithced by said third reflector.

Claim 31

An optical system for retinal cameras according to claim 28 further comprising a light path bending fourth reflector which is provided between said first reflector and eyepiece, to bend the light path from said first reflector and then direct it to said eyepiece.

Claim 32

An optical system for retinal cameras comprising an objective for forming a retina image of an eye to be inspected, an illuminating optical system including therein a light source to illuminate the surface of the retina, a relay lens for leading to a film surface the retina image formed by said objective, a first reflector which can switch light paths and is arranged between said relay lens and the position of the retina image focused by said relay lens, an eyepiece arranged in the light path of the light reflected by said first reflector, characterized in that said optical system further comprises at least two light path bending second reflectors which are provided between said objective and relay lens, which bend the light path from the objective and then direct it to the relay lens, a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector, and a fourth reflector which can switch light paths and is arranged between said first reflector and eyepiece, the one reflector arranged in the position nearest to the objective of said second reflectors being able to switch light paths, and whereby the light having passed through the objective is led directly to the eyepiece by switching said one of said second reflectors and said fourth reflector and thereby the front part of the eye to be inspected can be observed.

Claim 33

An optical system for retinal cameras comprising an objective for forming a retina image of an eye to be inspected, an illuminating optical system including therein a light source to illuminate the surface of the retina, a relay lens for leading to a film surface the retina image formed by said objective, a first reflector which can switch light paths and is arranged between said relay lens and the position of the retina image focused by said relay lens, an eyepiece arranged in the light path of the light reflected by said first reflector, characterized in that said optical system further comprises at least two light path bending second reflectors which are provided between said objective and relay lens, which bend the light path from the objective and then direct it to the relay lens, a third reflector which can switch light paths and is arranged between said first reflector and the position of the retina image formed on said film surface by said relay lens so that a color film and monochromatic film can be arranged in the positions of the retina image by said relay lens in the respective light paths switched by said third reflector, and a fourth reflector which can switch light paths and is arranged between said first reflector and eyepiece, the one reflector arranged in the position nearest to the objective of said second reflectors being able to switch light paths, and whereby the light having passed through the objective is led directly to the eyepiece by switching said one of said second reflectors and said fourth reflector and thereby the front part of the eye to be inspected can be observed.

Claim 34

An optical system for retinal cameras according to claim 30 wherein an image rotator is arranged in the light path directed directly to the eyepiece from the objective between the one of said second reflectors made a reflector which can switch light paths and said fourth reflector.

Claim 35

An optical system for retinal cameras according to claim 31 wherein auxiliary lenses for adjusting the magnification of the pupil and the position of the image are arranged near said image rotator.

Claim 36

An optical system for retinal cameras according to claim 30 further comprising a dark tube arranged between said first reflector and fourth reflector.

Claim 37

An optical system for retinal cameras according to claim 33 wherein said illuminating optical system comprises a fifth reflector having an aperture in the center and arranged between said objective and relay lens, a ring slit and a projecting lens for forming the image of said ring slit near said fifth reflector so that the illuminating light having passed through said ring slit is focused by said projecting lens and is then refocused near the cornea of the inspected eye by said objective.

Claim 38

An optical system for retinal cameras according to claim 33 wherein said illuminating optical system is arranged in an area enclosed with the light path bent by said second reflectors and the light path of the light reflected by said first reflector to be directed to said eyepiece.

Claim 39

An optical system for retinal cameras according to claim 32 further comprising a beam splitter provided between said first and fourth reflectors and a light receiving element arranged in the light path of the light divided by said beam splitter to receive it and thereby to generate a signal for effecting at least one of automatic focusing and automatic exposure controlling.