JPH05884Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an eyepiece device for an endoscope, and more specifically, to an improvement of a cam mechanism that adjusts the diopter and sets the photographing state. be.

[Prior Art] This type of endoscope eyepiece device generally adjusts the diopter and sets the photographing state by changing the distance between the end face of the image guide fiber and the eyepiece lens. It is used. For information on what optical conditions are considered shooting conditions,
There are several methods, but one that is widely used is to set the eyepiece to the 0-day opter, convert the light rays from the end of the image guide fiber into parallel rays, and then form an image on the film surface using a separately provided imaging lens. ing.

This so-called 0-day optor eyepiece device is
Previously, a cam for adjusting the diopter and a cam for adjusting the 0-day opter for projection were provided separately, but in order to simplify the mechanism and reduce weight, a single cam was used to adjust the end face of the image guide fiber. An improvement has been made to change the distance between the eyepiece and the eyepiece (Japanese Utility Model Publication No. 59-90915). FIG. 4 shows the cam groove 40 used therein. For example, the cam groove 41 for diopter adjustment in the range of -8 to +2 dayopters is connected to the end (+2 dayopter side) and is connected to the photographing state. A groove 42 for a 0-day optor is formed. The pin 43 connected to the eyepiece is moved along the cam groove 40 by the diopter ring which is rotated.

[Problems to be Solved by the Invention] The conventional endoscope eyepiece device described above has a groove 4 for photographing condition continuous to the end of the cam groove 41 for adjusting the diopter.
2, when adjusting the diopter from the shooting state, the diopter ring had to be rotated significantly, making the diopter adjustment operation extremely complicated.

In addition, most people's eyes have a diopter that is adjusted between -1 and -4 days, but as shown in Figure 4, the diopter ring is rotated from position a in the shooting state and moved to the diopter adjustment side. Since the lens always passes through position b of the +2 diopter, the diopter adjustment state becomes even worse than the photographing state, and the diopter ring is reflexively returned to the original position of the photographing state. Another drawback was that it was difficult to adjust the diopter by repeating this action repeatedly.

This invention eliminates such drawbacks of the conventional method,
To provide an eyepiece device for an endoscope in which the diopter is adjusted and the photographing state is set using one cam, and the diopter can be easily switched between the diopter adjustment and the photographing state, and the diopter can be easily adjusted. The purpose is to

[Means for Solving the Problems] In order to solve the above-mentioned problems, an eyepiece device for an endoscope according to the present invention has an eyepiece disposed opposite to the end surface of the image guide fiber, and In an endoscope eyepiece device, the distance between the end face of the cam and the eyepiece lens is changed using one cam to adjust the diopter and set the photographing state. The present invention is characterized by providing a range in which the distance between the image guide fiber and the eyepiece lens does not change while maintaining the photographing state in the middle part of the movement range of the cam.

[Function] Since the shooting condition is set in the middle of the diopter adjustment range, the appropriate diopter can be adjusted with a small amount of movement of the cam, and the cam can be adjusted while maintaining the shooting condition. Since there is a certain range within which the cam is not affected, even if the cam position is slightly shifted, it can be accurately adjusted to the shooting condition. Further, since the photographing state may be set in the middle portion of the diopter adjustment that changes in a fixed direction, no unnatural feeling occurs in the diopter adjustment.

[Example] Fig. 3 is a vertical sectional view of an embodiment of the present invention,
The figure is a front view.

In the figure, 1 is an operating section, 2 is an eyepiece support tube fixed to the operation section 2 with screws, and 3 is an eyepiece main body fixed to the eyepiece support tube 2 with screws. A mount 3a is formed on which a photographing device or the like is mounted.

4 is an eccentric adjustment frame which is loosely inserted into the eyepiece support cylinder 2 so as to be able to adjust the eccentricity and is fixed with screws;
is an image guide fiber fixing frame which is fixed to the eccentric adjustment frame 4 with screws and fixes the image guide fiber 6 with screws. 6a is the end base of the image guide fiber, and 6b is the end surface of the image guide fiber on the eyepiece side. 7
is a cover glass that prevents dust etc. from adhering to the end surface 6b of the image guide fiber;
It is connected to the head of the image guide fiber fixing frame 5 via a mounting cap 8.

Reference numeral 9 denotes a lens frame fitted into the eyepiece main body 3 so as to be movable in the axial direction, and the eyepiece 10 is inserted into the eyepiece main body 3 so as to be movable in the axial direction.
It is built in such a way that it faces the . 11 is a spacer that provides a predetermined distance between the eyepieces 10;
2 is screwed onto the lens frame 9, and the eyepiece 10 is attached to the lens frame 9.
This is a lens fixing ring that presses and fixes the lens.

A cam groove 20 is bored in the side wall of the eyepiece main body 3, and a pin 13 that is screwed onto the side wall of the lens frame 9 and projects laterally is passed through the cam groove 20. Further, since the coil spring 14 always urges the lens frame 9 upward, the pin 13 always comes into contact with the upper side of the cam groove 20. 15 is a spring receiver placed on the eccentric adjustment frame 4.

FIG. 1 shows the shape of the cam groove 20, and the diopter adjustment range is formed between both ends of the cam. In this embodiment, the right end side is formed, for example, as a +2 day optic, and the left end side is formed as, for example, a -8 day optic.
In the middle part of the cam groove 20 that changes at a constant angle in a constant direction, a 0-day opter section 21 of a constant section is formed at the 0-day opter position, where the distance between the image guide fiber and the eyepiece does not change. ing.

Returning to FIG. 3, 16 is a diopter ring that is rotated, and a concave groove 17 is vertically formed inside the diopter ring.
The head of pin 13 is engaged with. Therefore, when the diopter ring 16 is rotated, the pin 13 and the lens frame 9 rotate together.

Nut 18 is screwed onto the eyepiece main body 3 in order to prevent the diopter ring 16 from coming off downward.
Reference numeral 9 denotes an exterior ring fixed to the eyepiece support tube 2 with screws so as to fit loosely into the lower end of the diopter ring 16, and the rotation index 22 provided on the diopter ring 16
When the pin 13 is aligned with a fixed index 23 provided on the exterior ring 19, the pin 13 is positioned in the 0-day optor portion 21 of the cam groove. Reference numeral 30 indicates O-rings for sealing installed at various locations.

According to the embodiment device configured in this way, when setting the camera to the shooting state, as shown in FIG.
Align with the fixed mark 22 provided on the exterior ring 19. Then, as shown in FIG.
is guided by the 0-day opter portion 21 of the cam groove 20, and enters the photographing state. At this time, the 0-day optor section 2
1 has a width, so even if the indices 22 and 23 do not match to some extent, the eyepiece 10 is guided to the 0 day opta photographing state.

Next, by rotating the diopter ring 16, the diopter is adjusted and the photographing state is switched to the observation state. In this case, the 0-day opter in the shooting state is
Since it is in the middle of the diopter adjustment range, the diopter ring 1b
By slightly rotating the lens, you can adjust the diopter to the proper diopter. Furthermore, since the direction in which the diopter changes is always constant with respect to the rotational direction of the diopter ring, no discomfort occurs when adjusting the diopter.

In the above embodiment, the eyepiece lens was moved to change the distance between the end face of the image guide fiber and the eyepiece lens, but the eyepiece lens was fixed and the end face of the image guide fiber was moved. It may also be something that moves.

[Effects of the invention] According to the endoscope eyepiece device of the invention, since the photographing state is set in the middle part of the diopter adjustment range of the cam, an appropriate diopter can be achieved with a small movement of the cam. The diopter adjustment operation is very simple, and since the shooting condition only needs to be set in the middle part of the diopter adjustment that changes in a fixed direction, there is no unnatural feeling when adjusting the diopter. First, it has an excellent effect that allows you to easily adjust the diopter.

[Brief explanation of drawings]

Fig. 1 is a developed view showing the cam groove of an embodiment of the present invention, Fig. 2 is a front view of the eyepiece of the embodiment, Fig. 3 is a longitudinal sectional view thereof, and Fig. 4 is a conventional eyepiece. FIG. 6b... end face of image guide fiber, 9
... Lens frame, 10 ... Eyepiece lens, 13 ... Pin, 16 ... Diopter ring, 17 ... Concave groove, 20 ... Cam groove, 21 ... 0 day opter section.

Claims (1)

[Claims for Utility Model Registration] (1) An eyepiece lens is arranged opposite to the end face of the image guide fiber, and the distance between the end face of the image guide fiber and the eyepiece lens is changed by one cam, In an endoscope eyepiece device that adjusts the diopter and sets the photographing state, the diopter adjustment range is between both ends of the cam, and the image guide fiber and the eyepiece are located in the middle of the cam's movement range. An eyepiece device for an endoscope, characterized by having a range in which the distance between the two does not change while maintaining a photographing state. (2) The eyepiece device for an endoscope according to claim 1, wherein the photographing state is a state in which the distance between the end face of the image guide fiber and the eyepiece lens is adjusted to a diopter of 0 dayopter. .