JPS6037535Y2 - Eyepiece with diopter adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eyepiece having a diopter adjustment mechanism with a releasable locking device.

As a conventional diopter adjustment mechanism of this kind, for example,
A locking device for a diopter adjustment tube is known according to No. 43755, and this will be explained with reference to an exploded perspective view in FIG. 1 and a sectional view in FIG. It is a diopter adjustment barrel that holds the diopter and is fitted into a fixed barrel 4, a spacing ring 5, and a tightening ring 6, which will be described later.

3 is a protrusion member fixed on the outer peripheral surface of the diopter adjustment cylinder 2;
is fixed to a fixed part (not shown), and has a cam groove 4a formed on the side wall and a cam groove 4a carved on the periphery of one end surface so as to guide the protrusion member 3 and move the diopter adjustment cylinder 2 forward and backward in the optical axis direction by its rotation. a fixed cylinder, 5 having a toothed portion 4b provided therein;
The tooth portion 5a meshing with the tooth portion 4b and the diopter adjustment cylinder 2
A linear guide i5 that fits with a pin 7 fixed on the outer peripheral surface of
It is an interval ring with b.

Reference numeral 6 denotes a tightening ring screwed onto a threaded portion 2a carved on the outer circumferential surface of the diopter adjusting cylinder 2, and by rotating it in the direction of arrow A, the spacing ring 5 is fixed to the fixed cylinder. It is designed to be pressed in direction 4.

However, in such a configuration, the diopter adjustment mechanism is locked by rotating the tightening ring 6 to engage the teeth 5a of the spacing ring 5 and the teeth 4b of the fixed barrel 4 with each other. Another disadvantage is that the operation is troublesome, and when releasing the lock, it is necessary to rotate the tightening ring 6 and then pull the spacing ring 5 toward you to release the engaged state.

Further, another conventional example of an eyepiece having this type of diopter adjustment mechanism is shown in FIGS. 3 and 4, 11 is an eyepiece, 12 is a lens frame that holds the eyepiece 11, and 13 is a fixed fixing lens (not shown). an outer frame fixed to the lens frame 1
2 and is connected by a helicoid.

14 is a display frame fixed to the lens frame 12 with screws 15 and can rotate integrally with the lens frame 12 and move forward and backward in the optical axis direction; 16 is a ring screwed onto the display frame 14; 17
is a stopper that can engage with the teeth 13a provided on the outer peripheral surface of the outer frame 13, and the mounting member 18 is rotated around the shaft 19 of the mounting member 18 screwed onto the outer peripheral surface of the display frame 14. Under normal conditions, the tip of the spring 20 housed therein presses into engagement with the teeth 13a of the outer frame 13 to lock the diopter adjustment mechanism.

However, in this configuration, in order to release the lock, it is only necessary to apply force in the direction of arrow A (see FIG. 2), but the rotation surface of the stopper 17 centered on the shaft 19 and the rotation surface of the helicoid connection are parallel to each other, so
When a force in the direction of arrow C is applied to the display frame 14 with respect to the outer frame 13 in the locked state, a force in the direction of arrow B is generated on the stopper, resulting in the lock being released.

Further, the stopper 17 must be pressed during the diopter adjustment operation, and the stopper 17 rotates together with the display frame 14, which poses a problem in operability depending on its position.

Therefore, the present invention aims to provide an eyepiece lens whose diopter adjustment mechanism can be locked and unlocked by a simple operation, and whose diopter adjustment operation is also simple. This will be explained with reference to FIGS. 5 to 8.

In FIG. 5, 21 is a lens frame that holds the eyepiece L, and 22 is an outer frame fixed to a fixed part (not shown), which is connected to the lens frame 21 by a helicoid.

23 is a display frame that is fixed to the lens frame 21 with screws 24 and can rotate integrally with the lens frame 21 and move forward and backward in the optical axis direction;
Reference numeral 25 indicates an eye shade attached to the display frame 24, and reference numeral 26 indicates a shaft 27 within a notch 22a provided on the outer peripheral surface of the outer frame 22.
The stopper is swingably supported by the display frame 23 and is pressed by a spring 28 housed in the outer frame 22 and a locking part 26a that can engage with the teeth 23a provided on the inner peripheral surface of the display frame 23. It has an arm portion 26b.

A rotating ring 29 is rotatably fitted around the outer frame 22, and is prevented from being removed by a ring 30 screwed onto the outer frame 22.

Reference numeral 31 denotes a ball disposed in a hole provided in the radial direction of the rotating ring, and two recesses 22b (only one of which is shown in the drawing) provided on the outer peripheral surface of the outer frame by a spring 32. ) to form a click mechanism.

Further, the rotary ring 29 has a cam portion 29a on its inner circumferential surface as shown in FIG. With 26b! At the same time, the tension of the spring 28 causes the stopper 26 to rotate to the right to the position shown by the chain line in FIG.
a, and at the other click stop position (locked position), the inner circumferential surface of the rotary ring 29 presses the arm portion 26 of the stopper 26 against the tension of the spring 28, thereby moving the locking portion 26a into the display frame. 23 to press against the teeth 23a.

Since the present invention is constructed as described above, when the click mechanism is in the lock position, the diopter adjustment mechanism is locked by the engagement between the locking portion 26a of the stopper 26 and the tooth portion 23a of the display frame 23. However, in order to release this lock, the rotary ring can be rotated to the other click stop position, that is, the release position.

At this time, the arm portion 26b of the stopper 26 is aligned with the cam portion 29a of the rotating ring 29, so the stopper 26 is rotated to the right by the tension of the spring 28 to the position shown by the chain line in FIG. 26a and display frame 23
The lock is released by disengaging the tooth portion 23a from the tooth portion 23a.

Thus, by rotating the display frame 23 around the optical axis, the lens frame 21 is rotated and diopter adjustment is performed.

After the diopter adjustment is completed, simply rotate the rotary ring 29 to the original lock position, and the stopper 26 will be rotated counterclockwise by the inner peripheral surface of the rotary ring 29 against the tension of the spring 28, so that the stopper 29 The locking portion 29a of the display frame 23 and the tooth portion 23a of the display frame 23 mesh with each other to lock the diopter adjustment mechanism.

In the embodiments described above, the outer frame and the lens frame are connected by a helicoid, but they may also be connected by a cam groove and a pin.

As described above, according to the present invention, the diopter adjustment mechanism is normally locked, but it can be unlocked by simply rotating the rotary ring 29 from the lock position to the release position, and the diopter adjustment mechanism can be unlocked by simply rotating the rotary ring 29 from the lock position to the release position. This is very advantageous because after adjustment, the diopter adjustment mechanism can be locked by a simple operation of rotating the rotary ring 29 and returning it to the lock position.

Further, when the lock is released, it is possible to remove the hand from the lock mechanism, so that the lock release and the diopter adjustment can be performed with one hand, which is particularly suitable for eyepiece lenses such as surgical microscopes.

Furthermore, since a rotary ring is used as the operating member of the locking mechanism, the operating member does not move on the outer periphery of the eyepiece and is located on the back side as in the conventional case, and the operation is simple.

Although the present invention has been described in the case of an eyepiece lens, it is not limited to this and can be applied to other similar rotation control mechanisms.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an example of an eyepiece with a conventional diopter adjustment mechanism, Fig. 2 is a sectional view thereof, and Fig. 3 is an optical diagram of a second example of an eyepiece with a conventional diopter adjustment mechanism. 4 is an enlarged sectional view taken along the line IV-■ in FIG. 3; FIG. 5 is a sectional view in the optical axis direction of an embodiment of an eyepiece having a diopter adjustment mechanism according to the present invention; 7 is a partially cutaway side view of the rotating ring, and FIG. 8 is a front view of the rotating ring viewed in the direction of the arrow in FIG. 7. 21...Lens frame, 22...Outer frame, 2
3...display frame, 24...screw, 25.
...eye shade, 26...stopper, 27...shaft, 28...spring, 29.
...Rotating ring, 30...Ring, 31
...Ball, 32...Spring.

Claims (1)

[Scope of utility model registration request] a display frame having a tooth portion that moves together with the lens frame; a rotatable stopper having a locking portion that engages with the tooth portion; and an arm portion that is pressed; An eyepiece lens having a diopter adjustment mechanism, comprising a rotatable rotating ring having a cam portion that engages and releases a stop portion and a tooth portion.