JPS6223298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called tilt-and-focus single-lens reflex camera having a film surface arranged obliquely with respect to a photographing optical axis. In particular, the present invention relates to a single-lens reflex camera with a tilt-and-swing arrangement that is provided with a data projection system that projects data onto a film surface.

The present invention enables the data projection system to be compactly incorporated into the camera with the addition of few parts in the above-mentioned single-lens reflex camera. The point is that the light beam from the data projection system is reflected toward the film surface at the retracted position during shooting.

Hereinafter, an embodiment in which the present invention is applied to an eyeball lens cross-section photographing device will be described. The crystalline lens cross-section photographing apparatus shown in FIG. 1 includes a slit illumination system S and a photographing optical system P, which are housed in a housing 1.

The slit illumination system S has a projection lens 3 in a lens barrel 2 fixed to a housing 1, reflecting mirrors 4 and 5, and an observation light source 6, and a slit 7 is arranged between the light source 6 and the reflecting mirror 5. be done. Furthermore, slit 7
A reflector 8 is disposed pivotably about an axis 9 between the reflector 8 and the light source 6, and can be moved between an inoperative position shown in solid lines in the figure and an active position shown in phantom lines. ing. Reflector 8 in working position
A photography illumination light source 10, such as a Canon lamp, is arranged on the reflected optical axis. An actuation lever 11 is provided as a mechanism for moving the reflector 8 between its activated and non-activated positions. Furthermore, a second slit diaphragm 33 is arranged in the projection lens barrel 2.

The actuating lever 11 is arranged so as to be pivotable about an axis 12, and a groove 13 at its tip engages with a pin 15 provided on an extension of the support frame 14 of the reflector 8. A solenoid 16 is disposed corresponding to the end of the operating lever 11, and this solenoid 16 is energized during photographing to push the end of the operating lever 11 in the direction of the arrow and move the reflector 8 to the operating position shown by the imaginary line.

The optical axis 17 of the objective lens 3 constitutes a slit optical axis, and a hollow cylindrical support shaft 18 is attached to the rear part of the housing 1 coaxially with this slit optical axis. The housing 1 is supported by a support frame 21 through bearings 19 and 20 at its lens barrel 2 and support shaft 18 . Therefore, the housing 1 can be rotated around the optical axis of the objective lens 3, that is, the slit optical axis, and the slit to be projected can also be rotated around the optical axis. Further, the support frame 21 is supported by a base so as to be movable back and forth, left and right, and up and down.

The photographic optical system P has a photographic lens 23 housed in a lens barrel 22, and the lens barrel 22 is supported by a camera housing 24 fixed to the housing 1. In this example, the optical axis 25 of the photographic lens 23 is
intersects the slit optical axis 17 at an angle of 45 degrees, and the photographing optical axis 25 is located inside the camera housing 24.
A film 26 is disposed on the extension of. The film 26 is arranged so that its extension surface is perpendicular to the extension of the slit surface, and the photographing lens 23 is
The extension of the main plane 23a is arranged so as to overlap the line of intersection between the extension surface of the film 26 and the extension of the slit surface.

The viewfinder includes the photographic lens 23 and the film 2.
6, the reflecting mirror 27 is movable between a reflecting position shown by a solid line in the figure and a retracted position shown by an imaginary line, and is used, for example, in the shutter release mechanism of a camera. It is moved from the reflection position shown by the solid line to the retracted position by a device interlocked with the .
On the reflection optical axis of the reflection mirror 27 at the reflection position,
A reflecting mirror 28 that directs the light beam from the photographing lens 23 toward the rear and substantially parallel to the slit optical axis 17 is provided, and a relay lens 2 is provided along the reflected optical axis.
9 and an eyepiece lens 30 are arranged.

The light flux passing through the photographing lens 23 is reflected by the reflecting mirror 27 and forms a slit cross-sectional image at 31. The light beam from this image further passes through a reflecting mirror 28 and a relay lens 29 to form an image at a position 32, and is observed by an eyepiece 30. In the finder system of this example, the first slit cross-sectional image 3
The principal plane 29 of the relay lens 29 is located at the intersection line between the plane containing the apparent first image 31a transferred by the reflecting mirror 28 and the plane containing the second slit cross-sectional image 32.
Since the extensions of a are arranged so that they overlap, even when the first image is formed obliquely to the optical axis and the second image is formed perpendicularly to the optical axis, the entire image plane is focused. can be matched. Therefore, according to this finder system, the first slit cross-sectional image can be observed as an aerial image, and the finder system can be made brighter than when using a focus plate.

The crystalline lens cross-section photographing apparatus of this example further includes means for preventing the reflected light flux from the eyeball surface from entering the photographing optical system during photographing. This means has a shielding member 35 mounted pivotably about an axis 34 on the housing 1 . The shielding member 35 has a distal end shielding portion 35a for blocking a portion of the projection light beam from the objective lens 3 and a rear extension portion 35b, and the rear extension portion 35b is urged downward by a spring 36. Therefore, the member 35 is always attached to the shaft 34.
The tip 35a is urged clockwise around the lens 3, and its tip 35a is held in a retracted position where it does not block the projection light beam from the lens 3.

A solenoid 37 is disposed corresponding to the end of the rear extension 35b of the shielding member 35, and an actuator 37a of the solenoid 37 projects in the direction of the arrow and pushes the member 35 counterclockwise when the solenoid is energized during imaging. , the tip shielding portion 35a is made to protrude into the slit projection optical path. An adjusting cam 38 is provided on the side opposite to the solenoid 37 with respect to the shielding member extension 35b, and this cam 38 determines the protruding position of the tip shielding portion 35a of the member 35 into the slit projection optical path.

The crystalline lens cross-section imaging device shown in FIG. 1 further includes a data projection system 41. As shown in FIG. This data projection system 41
As shown in FIG. 2, four reflecting mirrors 42, 43, 44, 45 reflect light from the photographing light source 10.
A data card 47 can be inserted into the casing 46 between the reflecting mirrors 44 and 45. That is,
As shown in FIG. 3, a guide flange 48 is attached to one side of an opening 46a provided in the casing 46, and a presser plate spring 49 is provided on the opposite side, thereby forming an insertion passage for a data card 47.

A plate material 100 having transparent parts 49, 50 and an angle display window hole 51 is fixed to the casing 46, and a data card 47 is inserted into and taken out from the transparent part 50 facing the transparent part 50. The data card 47 consists of a card plate 47a and a support portion 47b, and a guide surface that engages with the flange 48 and the presser plate spring 49 is formed on the support portion 47b. As shown in FIG. 4, on the card board 47a, data such as the subject's name, right eye or left eye, date of examination, etc. are written. A density scale is arranged in the transparent part 49.

An angle display index plate 52 is attached to the casing 46 so that its upper part corresponds to the window hole 51 of the card board 47a. The index plate 52 has a transparent part 52a on which an angle scale is written in the upper half, and has a weight 53 in the lower part. The index plate 52 is connected to the slit optical axis 1
The housing 1 is rotatably mounted by an axis 54 substantially parallel to the housing 1, and thus maintains a constant posture even when the housing 1 is rotated. Therefore, an angular scale corresponding to the rotation angle of the housing 1 appears in the window hole 51 of the card board 47a.

A projection lens 55 is provided at the tip of the casing 46, and each data on the card board 47a is projected through the projection lens 55 by light from the photographing light source 10. In the present invention, a finder-type reflecting mirror 27 receives this data projection light beam at a retracted position for photographing and reflects it toward the film 26. That is, in the present invention, the viewfinder type reflector 27 also works as a part of the data projection system at the retracted position during photographing, so the utilization of parts is increased, the number of parts is reduced, and the data It becomes easier to incorporate the projection system into the camera.

Although an example in which the present invention is applied to an eyeball lens cross-section photographing device has been described above, the present invention is not limited to such an example, and can be widely applied to single-lens reflex cameras with a tilt-and-swing arrangement having a data projection system. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example in which the present invention is applied to a crystalline lens cross-sectional photographing device, FIG. 2 is a cross-sectional view showing details of a data projection system, and FIG. 3 is a cross-sectional view taken along the line - FIG. 2 is a sectional view taken along the line -- in FIG. 2; 1... Housing, 3... Projection lens, 6...
Illumination light source, 7... Slit, 10... Light source for photography, 23... Photography lens, 26... Film, 2
7... Reflector, 41... Data projection system, 47...
Data card, 55...data projection lens.

Claims (1)

[Scope of Claims] 1: a photographing lens; an image receiving surface inclined with respect to the photographing optical axis of the photographing lens; and a photographing optical path between the photographing lens and the image receiving surface, which is removably disposed in the photographing optical path, and when inserted, It has a reflecting mirror having a reflecting surface for guiding the light flux from the photographing lens to the finder optical system, and a data photographing system for photographing data during photographing, and the reflecting mirror is retracted out of the photographing optical path during photographing, and A tilt-and-shift single-lens reflex camera having a data photographing system, characterized in that the projection light beam from the data photographing system is reflected by the reflecting surface toward the image receiving surface at this retracted position. 2. A tilt-and-shift single-lens reflex camera having a data photographing system according to claim 1, wherein the image receiving surface is a photographic film surface. 3. A tilt-shift single-lens reflex camera having a data photographing system according to claim 1 or 2, wherein the reflecting mirror is a flip-up reflecting mirror.