JPS6289917A - Lens - Google Patents

Abstract

PURPOSE:To set a lens into a lens frame accurately, easily, and quickly without damaging the surface shape of the lens by engaging directly the lens with a screw part provided in the lens frame. CONSTITUTION:A screw part 44 is provided in a lens frame 41, and its pitch is matched to a thickness 43a of the peripheral edge (edge thickness) of a lens body 43. The lens body 43 is screwed in the direction of an arrow to deform a lens frame deforming part 46, which has an inside diameter smaller than the outside diameter of the lens body in the terminal part of the screw part 44, in the radial direction and is dropped to a lens insertion part 42 and is fixed. The lens frame deforming part 46 consists of lower parts 11 having the same diameter as the bottom diameter of the screw part 44 and peak parts having an inside diameter smaller than the outside diameter of the lens body 43, and the lens body 43 goes gradually toward the smaller-diameter part by screwing-in and passes peak parts 12 of the lens frame deforming part 46 and is fixed to the lens insertion part 42.

Description

[Detailed description of the invention] The present invention relates to improvements in lenses.

FIG. 1 is a sectional view showing a conventional method of fixing a lens to a lens frame.

Conventionally, the method of fixing the lens 6 to the lens frame 5 is to abut the lens frame abutting part 4, and then use a retaining ring 2 with a screw 2a cut around the circumference to fix the lens 6 to the abutting part 4 of the lens frame 5. Press to secure.

This presser ring 2 is fixed to the lens frame 5 via a threaded portion l cut inside the lens frame 5. Further, in the lens frame fitting part 3, the inner diameter of the lens frame 5 is made slightly larger than the outer diameter of the lens 6. However, this difference between the inner diameter of the lens frame 5 and the outer diameter of the lens l causes play when the lens is assembled into the lens frame 5, so please take care to prevent this play from affecting the lens performance. The amount is extremely small.

In addition, since the lens 6 is pressed against the lens frame abutting portion 4 by tightening the presser ring 2, the shape of the lens is affected.
The lens 6 may sag, the radius of curvature may change, and the number of Newtonian fringes may increase or become disordered compared to before the lens 6 was fixed inside the lens frame body 5.
There was a risk that the standalone performance of the unit would be drastically reduced.

SUMMARY OF THE INVENTION The present invention has been devised to solve the various drawbacks of the conventional lenses described above. By configuring the lens so that it can be directly screwed onto the provided threaded part, the lens can be installed accurately, easily, and quickly in the lens frame without changing the surface shape of the lens. It is characterized by the following.

Examples of the lens of the present invention will be described below with reference to the drawings.

FIGS. 2a to 2c show a first embodiment of the lens of the present invention.

In principle, a threaded portion 44 is provided inside the lens frame 41, and the pitch thereof is matched to the thickness 43a of the peripheral edge of the lens body 43. Next, screw the lens body 43 from the arrow side in FIG.
By deforming the lens frame deforming portion 46 having an inner diameter smaller than the outer diameter in the radial direction, the lens body 43 falls into the lens insertion portion 42 and is fixed.

Further, as shown in FIG. 2d, the shape of the lens frame deforming part 46 is such that the lower part 11 of the lens frame deforming part has a diameter equal to the root diameter of the threaded part 44, and the inner diameter is smaller than the outer diameter of the lens body 43. As the lens body 43 is screwed in, the lens body 43 gradually advances toward the smaller diameter, and passes through the peak part 12 of the lens frame deformation part 46 to form the lens insertion part 42. It will be fixed to.

Also, depending on the material of the lens frame 41, the deformation of the lens body 43 may be greater than the deformation of the lens frame deformable part 46, so the difference between the lens outer diameter and the inner diameter of the lens frame deformable part 46 is
It must be determined by the materials of the lens frame 41 and lens body 43.

In addition, when the lens frame deforming portion 46 is provided on the inner wall of the lens frame 41, there are four as shown in FIG.
As shown by the dotted line in FIG.
6a can also be implemented by providing the entire circumference of the inner circumferential wall surface of the lens frame 41.

Furthermore, the lens body 43 can be screwed in by either suctioning the lens surface with a suction plate, or by providing a lens cannibal hole 45 outside the effective diameter of the lens body 43, as shown in Figure 2, c. It is possible to realize the penetration.

In the case of a plastic lens, the above-mentioned lens slit hole 45 can also be formed by utilizing the marks of an ejector pin during molding.

Furthermore, by inserting an elastic member between the lens body 43 and the barrel portion 47, it is possible to prevent the lens from wobbling in the thrust direction.

Further, the threaded portion 44 is not limited to the square thread shown in FIG. 2a, but other thread shapes may also be used.

FIG. 3 shows a second embodiment of the lens of the present invention.

The principle is the same as that of the first embodiment of the lens of the present invention, but the lens body 43 is the same as the lens body 4 in FIG. 2a.
When passing through the lens frame deforming portion 46 having an inner diameter smaller than the outer diameter of 3, the second embodiment is an easier version of the insertion method of the first embodiment, and is more practical.

In other words, the lens frame deforming portion 46 is made easier to deform as shown in FIG. That is, the lens frame deforming part 49 is provided on the outside of the lens frame deforming part 46 in FIG. This allows the lens body 43 to pass through the lens frame deforming part 46 and to be fixed to the lens insertion part 42 more easily than in the example.

Further, the lens frame deforming part 46 and the lens frame deforming part 49 are formed around the entire inner circumference of the lens frame 41, or at regular intervals, or on the lens frame 41.
This can be implemented by providing a portion of the inner diameter of the

FIGS. 4a to 4c show a third embodiment of the lens of the present invention.

The principle is the same as that of the first embodiment, but the lens body 43 easily passes through the lens frame deforming portion 46 having an inner diameter smaller than the outer diameter of the lens body 43 in FIG. In the third embodiment, the lens has a deformation function. That is, as shown in FIGS. 4a and 4b, a lens spring arm 51 and a deformation absorbing space 52 are provided around the lens body 43.
1, when the lens body 43 passes through the lens frame deforming portion 46, it falls toward the deformation absorbing space 52, thereby easily fixing the lens.

Further, the lens spring arms 51 and the deformation absorbing spaces 52 are arranged around the entire circumference of the lens body 43 or at regular intervals, and further,
This can be implemented by providing it on a part of the outer periphery of the lens body 43.

Also, the shape of the lens spring arm 51 is N in addition to the figure 7 shape shown in Fig. 4a.
Modified examples include a letter shape, a W-shape, and even a repeating seven-letter shape such as a W-shape.

Also, by providing an elastic body around the outer periphery of the lens,
It can serve as a lens arm 51.

Next, regarding the shape of the lens spring arm lens frame fitting part 53, the length l in the thrust direction is equal to the pinch of the threaded part 44 provided inside the lens frame. It is necessary to provide a guide 54 as shown in FIG. 4C.

In addition to the shape shown in FIG. 4C, the shape of this guide may be modified such as spherical, hemispherical, quadrangular, polygonal, and 7-shaped.

FIGS. 5a to 5h show a fourth embodiment of the lens of the present invention.

The purpose is the same as that of the third embodiment, and the lens spring arm 51 in FIG.
and lens frame fitting portion 58. That is, the lens body 56 is screwed in using the screw 44 provided inside the lens frame 41 shown in FIG.
6, the lens body 56 is rotated clockwise to try to screw it in, so the right arm 57 of the lens twist is attached to the lens body 5.
6 side, the outer diameter of the lens frame fitting part 58 becomes smaller, the lens body 46 easily passes through the lens frame deformation part 46, and then the lens spiral right arm 57 returns to its original position, and the lens body 5
6 can be fixed to the lens insertion part 42. Further, the shape of the lens winding arm 57 can be modified by making a notch (not shown) at its base so that the right arm 51 of the lens swirl can move easily, or by changing the degree of its tapered shape.

5c-h show the shapes of the lens frame fitting portion 58, FIGS. 5c and d are spherical, FIGS. 5e and f are semicircular in cross section, and FIG. 5g , h is the lens frame fitting part 5
A threaded portion 58a, which is the same as the threaded portion 44 provided inside the lens frame, is provided on the outer periphery of the lens frame 8. In addition, the shape of the lens frame fitting portion 58 can be changed from a hemisphere or a spherical cross section to a trapezoid or other polygonal shape.

As is clear from the above explanation, according to the lens of the present invention, the lens can be fixed in the lens frame without using the conventional retaining ring, so that the deterioration of the surface shape of the lens due to the retaining ring is caused by an increase in the number of Newtons. (increase in ass) was not observed.

Further, since a member that deforms in the radial direction is provided on the outer periphery of the lens, when the lens is screwed into the lens frame, it can be easily and quickly inserted and fixed without changing the surface shape of the lens.

Furthermore, since a member that deforms in the radial direction is provided around the outer circumference of the lens, it is possible to absorb changes in the surface shape caused by changes in the lens external shape due to changes in environmental temperature, expanding the operating temperature range of plastic lenses. , it is possible to realize it. In particular, according to the lens of the present invention, the lens can be directly screwed onto the lens frame without using a retaining ring, and the lens mounting operation can be performed accurately, quickly, and easily.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional lens holding device, Fig. 2a is a sectional view showing a state in which the lens of the present invention is held, Figs. Figure d is an end view showing the lens frame deformation part, Figure 3 is a partially enlarged sectional view showing a different embodiment from Figure 2a, and Figures 4a-c are the same as Figure 2.
4A is a side view of the lens, FIG. 4C is a front view of the lens, FIG. 4C is a partial side view of the lens spring arm, and FIG. a-h are from Figure 2.
Fig. 5a, Fig. 5a,
b is a side view and a front view of the lens, Figure 5 cxh is the fifth
Figures 5r and 5h are partial front and side views of the right arm of the lens vortex showing a different embodiment from those shown in Figures a and b, and Figures 5r and 5h are partially sectional views. 1... Threaded part 2... Holding ring 3... Lens/lens frame fitting part 4... Lens/lens frame contact part 5... Lens frame body 6... Lens 11... Mirror Lower part 12 of the frame deformation part...Peak part 41 of the lens frame deformation part...Mirror frame 42...Lens insertion part 43...Lens body 44...Threaded part 45...Lens hook hole 46 ... Lens frame deformation part 47 ... Body mounting part 48 ... Lens frame screw part 49 ... Lens frame deformation negation part 51 ... Lens flap arm 52 ... Deformation absorption space 53 ... Lens flap arm Lens frame fitting part 54... Guide 57... Lens swirl right arm 58... Lens frame fitting part Fig. 8 (.) Fig. 4 Fig. 5 (Q) (b) Just go to (C) (d)

Claims (3)

[Claims] (1) A lens characterized in that a threaded portion is provided on the outer periphery of the lens body, and the root diameter of this threaded portion is configured to be larger than the effective diameter of the lens body. (2) The lens according to claim 1, wherein the lens body is provided with an engaging portion for rotating the lens on a lens surface outside the effective diameter thereof. (3) The lens body has a fitting portion with the lens holding member provided outside the effective diameter of the lens body.
Lenses listed in section.