JPH0785136B2 - Endoscope eyepiece device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an eyepiece device for an endoscope that uses an eyepiece lens having a diopter adjustment mechanism as a projection lens for photographing, and in particular, When an attachment such as a photographing device is attached, the eyepiece device of an endoscope that can move the eyepiece lens to a predetermined position within the diopter adjustment range regardless of the diopter adjustment position of the eyepiece lens Related to the improvement of.

[Prior Art] In the positioning mechanism of the conventional endoscope eyepiece device, since the position of the eyepiece lens when the attachment such as the image pickup device is mounted is outside the diopter adjustment range, the photographing magnification is different from that of the eyepiece lens. It was decided according to the magnification, and it was not possible to freely select the size of the shooting screen according to the film size.

Therefore, conventionally, as disclosed in, for example, Japanese Patent Publication No. 56-1601, an eyepiece is held in a double cylinder body that is biased by two coil springs that act in axially opposite directions. It is known that an engagement portion that engages with each other is formed on the lens frame and the attachment so that the eyepiece lens frame can be moved to a predetermined position (for example, 0 diopter) within the diopter adjustment range by the attachment. ing.

[Problems to be Solved by the Invention] When an attachment such as a photographing device is attached to the eyepiece to form an image on the projection surface, the longitudinal magnification is geometrically optical from “from the image to the focal point of the optical system”. Since it is proportional to the square of the distance, the slight deviation of the distance is greatly amplified on the projection surface and causes defocus.

In this respect, the Japanese Patent Publication No. 56-1601 described above engages the eyepiece lens frame and the attachment when the diopter adjustment is at a negative diopter (that is, when the eyepiece is at a low position). Is to lift the eyepiece frame against the spring force, and conversely when the diopter adjustment is in the positive diopter (that is, when the eyepiece is in a high position), push down the eyepiece frame against the spring force. Because I was doing
There is a defect that the position of the eyepiece lens is deviated by the amount of backlash or wear of the engaging portion between when the eyepiece lens frame is pulled up and when the eyepiece lens frame is pushed down, resulting in defocusing on the projection surface.

The present invention solves the above-mentioned drawbacks of the related art, and it is possible to always obtain a clear projected image when the eyepiece lens is moved to a predetermined position within the diopter adjustment range by mounting the attachment. An object is to provide an eyepiece device for an endoscope.

[Means for Solving Problems] An eyepiece device for an endoscope according to the present invention for solving the above problems will be described with reference to FIG. 1 corresponding to an embodiment. A mount 12 to which an attachment 14 such as a photographing device is attached and detached is provided, and the diopter is adjusted by moving the eyepiece frame 8 holding the eyepiece 9 up and down along the optical axis direction. The eyepiece frame 8
The head of the is provided with a plurality of laterally protruding ear pieces 18,
These ear pieces 18 are formed by vertically dividing them by a slot 16. An engagement groove 20 that engages the ear pieces 18 by sandwiching them from above and below is formed in the attachment 14 and is attached to the mount 12 of the eyepiece main body 2.
When is mounted, the ear piece 18 of the eyepiece frame and the engagement groove 20 of the attachment are engaged with each other, and the ear piece 18 is sandwiched in the engagement groove 20 from above and below and elastically deformed, and its deformation. The earpiece 18 is strongly pressed against the upper and lower walls of the engagement groove 20 by the elastic force of the eyepiece 9 to return to the original position, and the eyepiece 9 is moved to a predetermined position within the diopter adjustment range.

[Operation] When the ear piece 18 of the eyepiece frame and the engagement groove 20 of the attachment are engaged with each other, the ear piece 18 is pinched in the engagement groove 20 from above and below and elastically deformed, and the deformation is attempted to return to its original state. The ear piece 18 is strongly pressed against the upper and lower walls of the engaging groove 20 by the elastic force of
It is locked in the engagement groove 20 without play. Therefore, no matter where the position of the eyepiece lens 9 before the attachment 14 is attached, after the attachment 14 is attached, the eyepiece lens 9 always moves to the same predetermined position without error.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The eyepiece device for an endoscope of the present invention comprises an eyepiece portion and an attachment, and FIG. 2 shows the eyepiece portion.

The configuration of the operating portion of this eyepiece is known from Japanese Patent Publication No. 56-1601, for example, and is, for example, a cylindrical eyepiece main body integrally provided on the head of the operation portion main body 1 of the endoscope. A slide cylinder 3 is fitted in the reference numeral 2 and the eyepiece body 2
A pin 4 that fits into a guide groove 2a formed along the axial direction (vertical direction) of the eyepiece body 2 is fixed to the upper and lower sliding cylinder 3.
A coil spring 5 whose both ends are supported is compressed and attached to the sliding cylinder 3.

A cam surface 6a, which is inserted into the eyepiece main body 2 and is prevented from moving in the axial direction, is formed with a pin 4 movable in the axial direction by pressurizing force of the coil spring 5 to come into pressure contact therewith. A diopter adjustment ring 7 that can be rotated by external operation
Are fixed by screws, and the axial length of the cam surface 6a corresponds to the diopter adjustment range (for example, -6 to +2 diopters).

Further, an eyepiece lens frame 8 having an eyepiece lens 9 attached thereto is fitted into the sliding cylinder 3, and a pin 4 is provided in a long groove 8a formed along the axial direction (vertical direction) of the eyepiece lens frame 8. End of
4a is fitted so that the eyepiece frame 8 does not rotate. Then, the coil spring 10 having both ends carried is compressed and mounted on the sliding cylinder 3 and the eyepiece lens frame 8, and is fixed to the sliding cylinder 3 by the fixing member 11 mounted on the eyepiece lens frame 8. Detachment is prevented.

Further, for example, a pair of left and right ear pieces 18 protruding laterally is formed on the head of the eyepiece frame 8 (see FIG. 3).
Each of the ear pieces 18 is divided into a top piece 18a and a bottom piece 1 by a slot 16.
And 8b are formed by being divided vertically. And arrow
When an external force that sandwiches the earpiece 18 from above and below like A, A is applied, the width (e) of the slot 16 becomes narrower.
When 18 is elastically deformed and the external force is removed, the width (e) of the slot is restored.

In this embodiment, since the upper piece 18a of the ear piece is thin and the lower piece 18b is thick, the upper piece 18a is mainly elastically deformed and the lower piece 18b is not deformed. ing.

On the other hand, on the head of the eyepiece body 2, there is formed a mount 12 to which an image pickup device and other attachments are attached and detached.
A pair of left and right guide pins 13 for mounting the attachment are projected on the side wall thereof.

FIG. 1 shows a state in which the attachment 14 is attached to the above-mentioned eyepiece part. The attachment 14 is fitted on the outer periphery of the mount 12, and a guide groove 15 formed in the attachment 14 (see FIG. 4). Engages with the guide pin 13 of the mount 12 and rotates the attachment 14, so that the guide pin 13 is guided into the parallel portion 15a of the guide groove 15, and the attachment 14 is attached to the mount 12 in a predetermined positional relationship. It

Further, a pair of left and right horizontal engaging grooves 20 that engage with the ear pieces 18 are formed in the lower end portion of the inside of the attachment 14 in alignment with the guide groove 15. Has ear pieces 18
When engaging with, the ear piece 18 is sandwiched in the engaging groove 20 from above and below. Then, the inlet side end of the engagement groove 20 is formed in a wide taper shape so that the ear piece 18 can engage with the engagement groove 20 regardless of the position of the eyepiece frame in the diopter adjustment range. ing.

19 is an attachment so that it is coaxial with the optical axis of the eyepiece when the attachment 14 is attached to the mount 12.
It is an image forming lens disposed inside 14.

Next, the operation of the above-described embodiment will be described. When the diopter adjustment ring 7 is rotated, when the diopter adjustment ring 7 is rotated, the elastic force of the coil spring 5 causes the pin 4 in pressure contact with the cam surface 6a to move in the optical axis direction. And the eyepiece frame 8 for holding the eyepiece 9 moves forward and backward integrally with the sliding tube 3 in the axial direction, so that the observation object can be adjusted in diopter arbitrarily according to its own eye. .

On the other hand, when mounting the attachment 14 on the mount 12, when the guide pin 13 is introduced into the guide groove 15 and the attachment 14 is fitted to the mount 12 and the attachment 14 is rotated, the eyepiece frame head portion 18-piece attachment
Even if the eyepiece frame 8 is guided into the engaging groove 20 of 14, and the eyepiece frame 8 is located at any position in the diopter adjustment range, the eyepiece 9 moves to a predetermined position (for example, 0 diopter) in the diopter adjustment range, The subject image is formed on the projection surface by the eyepiece lens 9 and the imaging lens 19.

In this state, the ear piece 18 is sandwiched in the engagement groove 20 from above and below, and the thin upper piece 18a is elastically deformed, and due to the elastic force of the deformation to return to the original shape, the ear piece 18 Is strongly pressed against the upper and lower walls of the engaging groove 20 and is locked in the engaging groove 20 without play. The elastic force of the ear piece 18 is set stronger by the elastic force of either the coil spring 5 or 10.
The deformation of the ear piece 18 is not affected by the elastic force of the two coil springs 5 and 10. Therefore, in this state, the eyepiece lens 9 always moves to a fixed position without error with reference to the position of the lower piece 18b of the ear piece that is not deformed, and the image is always sharply formed on the projection surface.

If the lower piece 18b of the ear piece is made thin and the upper piece 18a is made thicker, the lower piece 18b mainly elastically deforms and the upper piece 18a that does not deform is deformed.
The position is the reference.

[Effects of the Invention] According to the endoscope eyepiece device of the present invention, the ear piece that is vertically divided by the slit and protrudes from the head of the eyepiece lens frame is provided in the engagement groove formed in the attachment. The ear piece is strongly pressed against the upper and lower walls of the engaging groove by the elastic force that is pinched from above and below and elastically tries to return to its original state, so there is no rattling in the engaging part, so the attachment is attached. After the attachment is attached, the eyepiece lens moves to a predetermined position without error regardless of the position of the previous eyepiece lens, and it is possible to always obtain a clear projection image.

Further, since the ear piece protruding from the eyepiece lens frame head is only divided into upper and lower parts by slotting, it is not necessary to dispose a leaf spring or the like, the structure is simple, and it has extremely high practicality.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a vertical sectional view of an eyepiece portion thereof, and FIG. 3 is a perspective view of a head portion of an eyepiece lens frame.
FIG. 4 is a perspective view of the attachment. 2 ... Eyepiece body, 8 ... Eyepiece frame, 9 ... Eyepiece, 12 ... Mount, 14 ... Attachment, 16 ...
Slots, 18 ... Ear pieces, 20 ... engagement grooves.

Claims (1)

[Claims] 1. A diopter adjustment is provided by providing a mount for attaching and detaching an attachment such as a photographing device in the eyepiece main body, and moving an eyepiece lens frame holding the eyepiece lens up and down along an optical axis direction. In the endoscope eyepiece device configured to perform the above, a plurality of laterally protruding ear pieces are provided on the head of the eyepiece lens frame, and the ear pieces are formed by vertically dividing each by ear slits. At the same time, an engagement groove is formed in the attachment to engage the ear pieces by sandwiching them from above and below,
When the attachment is mounted on the mount of the eyepiece body, the ear piece of the eyepiece frame and the engagement groove of the attachment engage with each other, and the ear piece is sandwiched in the engagement groove from above and below and elastically deformed. However, it is characterized in that the earpiece is strongly pressed against the upper and lower walls of the engagement groove by the elastic force that the deformation returns to the original, and the eyepiece moves to a predetermined position within the diopter adjustment range. Endoscope eyepiece device.