JPS606913A - Lens moving device - Google Patents

Abstract

PURPOSE:To prevent a lens from having a shift in optical axis by preventing the operating force of an operator from being applied directly to a lens holding frame. CONSTITUTION:The focusing lens holding frame 11 which holds a focusing lens 10 is fitted rotatably in a fixed lens barrel 12, slants circumferentially, and has three end surface cams 13a, 13b, and 13c at 120 deg. pitch. Those end surface cams 13a, 13b and 13c abut on pins 14a, 14b, and 14c implanted in the fixed lens barrel 12, and leaf springs 16a, 16b, and 16c fixed to the outer circumference of the focusing lens holding frame 11 with screws 15a, 15b, and 15c engage with projection wall parts 17a, 17b, and 17c of the fixed lens barrel 12 to energize the holding frame 11 in the direction of the optical axis 18 of the focusing lens 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens moving device used for adjusting the focus of a camera lens.

Conventional Structures and Their Problems In recent years, there has been a strong demand for lenses used in home video cameras and the like to be lightweight.

A conventional lens moving device will be described below with reference to the drawings. Generally, many lens focus adjustment mechanisms use helicoid screws, but in order to simplify the structure, helicoid screws are not used, and the structure is shown in the cross-sectional view of a conventional lens moving device in Figure 1. There is.

In FIG. 1, a focusing lens holding frame 2 that holds a focusing lens 1 is rotatably fitted into a fixed lens barrel 3, and further extends in the circumferential direction as shown in the exploded view of FIG. It has three end cams 4a, 4b, and 4c that are inclined with respect to each other.

The end cams 4a, 4b, 4c are in contact with pins 5a, 6b, sc installed in the fixed lens barrel, and a leaf spring 6a provided in the focusing lens holding frame 2.

6b and 6c engage with the convex walls 7a, 7b, and 7C of the fixed lens barrel 3, thereby holding the focusing lens holding frame 2 in place of the focusing lens 1.
is biased in the direction of the optical axis 8.

Therefore, when the focusing lens holding frame 2 is rotated, the pins 5a,
The focusing lens 1 is moved in the direction of the optical axis 8 by the end cams 5b, 5c and the end cams 4a, 4b, 4c, and the focus of the lens can be adjusted.

However, in the above configuration, when adjusting the focus, the focusing lens holding frame 2 is rotated directly by hand, so if the urging force of the leaf springs 6a, 6b, 6c is weak, the force applied by the hands may are three end cams 4a, 4b,
4c and bin 5a, eib.

6C may become separated, causing the optical axis 8 of the focusing lens 1 to tilt. Furthermore, if the biasing force of the leaf springs 6a, eb, and 6c is increased to prevent tilting, there is a drawback that the rotational torque of the focusing lens holding frame 2 increases during normal operation. Furthermore, you can directly focus the lens holding frame 2 by hand.
Therefore, the thickness of the focusing lens holding frame 2 needs to be increased because of the need for strength, resulting in an increase in weight.

OBJECTS OF THE INVENTION An object of the present invention is to provide a lens moving device that does not cause optical axis deviation of lenses and can be made lightweight.

Structure of the Invention The lens moving device of the present invention includes a fixed lens barrel, a lens holding frame that is slidably fitted to the fixed lens barrel, and provided on at least one of the fixed lens barrel and the lens holding frame, and an inclined surface inclined with respect to the circumferential direction; a sliding contact portion capable of slidingly contacting the inclined surface;
A pressing member that presses the inclined surface and the sliding contact portion against each other, a first gear provided on the outer periphery of the lens holding frame, a second gear that meshes with the first gear, and a second gear that are integrated into one body. It is configured to include an operating member that rotates, and as a result,
Since the operating force of the human hand is not directly applied to the lens holding frame, the optical axis of the lens does not shift.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a sectional view of a lens moving device according to an embodiment of the present invention, FIG. 4 is a front view, and FIG. 5 is a developed view. In those drawings, a focusing lens holding frame 11 that holds a focusing lens 10 is rotatably fitted into a fixed lens barrel 12, and is also inclined with respect to the circumferential direction.
It has three end cams 13a, 13b, and 13c with an O pitch. The end cams 13a, 13b, 13c are attached to the bins 14a, 14b, 14.
Leaf springs 16a, 1 are in contact with c and are fixed to the outer periphery of the focusing lens holding frame 11 with screws 15a, 15b, 15c.
6b and 16c are convex wall portions 17a and 17 of the fixed lens barrel 12.
By engaging with b and 17c, the focusing lens holding frame 11 is urged in the direction of the optical axis 18 of the focusing lens 10. Note that the leaf springs 16a, 16b, and 16C are connected at the base of the spring, and the leaf springs 16a, 16b, and 16c are
consists of a single part. In addition, lens holding frame 1
As shown in FIG. 6, a first spur gear 19 is integrally provided on the outer peripheral portion of the first spur gear 19 with a width inclined in the circumferential direction. The first spur gear 19 meshes with a second spur gear 21 rotatably mounted on a rotation shaft 2o implanted in the protrusion 12a of the fixed lens barrel 12. Furthermore, an operating lever 22 is implanted in the second spur gear 21, and the operating lever 22 protrudes from the elongated hole 24 of the lens exterior cover 23. In addition, in the example of -F, the case where the end cam is provided on the focusing lens frame has been explained, but the same effect can be obtained even if the end cam is provided on the fixed lens barrel. It is essentially the same even if it is made into a cam shape.

Effects of the Invention As is clear from the above explanation, the present invention has a fixed lens barrel,
a lens holding frame that slidably fits into the fixed lens barrel;
An inclined surface provided on at least one of the fixed lens barrel and the lens holding frame and inclined with respect to the circumferential direction, a sliding contact portion capable of slidingly contacting the inclined surface, and suppression for pressing the inclined surface and the sliding contact portion against each other. A first gear provided on the outer periphery of the lens holding frame, a second gear that meshes with the first gear, and an operating member that rotates integrally with the second gear. Since human operating force is not applied directly to the lens holding frame, the optical axis of the focusing lens will not tilt even if the pressing force of the pressing member is weak, and the rotation torque of the focusing lens holding frame is also small. can do.

Furthermore, the thickness of the focusing lens holding frame can be made thinner, resulting in the effect that the overall weight can be reduced. Therefore, it has the excellent effect of being able to provide a lens moving device that is lightweight and has good performance without tilting the optical axis.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of a conventional lens moving device, Fig. 2 is a developed view thereof, Fig. 3 is a sectional view of the main part of a lens moving device according to an embodiment of the present invention, and Fig. 4 is its front view FIG. 5 is a developed view thereof. DESCRIPTION OF SYMBOLS 11... Focusing lens holding frame, 12... Fixed lens barrel, 13a, 13b, 13c... One end surface cam, 14a. 14b, 14C-... pin, 16a, 16b,
16C...Plate spring, 19...First spur gear, 21...Second spur gear, 23...
・Operation lever. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 Figure 1θ Figure 5

Claims (1)

[Claims] a fixed lens barrel, a lens holding frame slidably fitted to the fixed lens barrel, and an inclined surface provided on at least one of the fixed lens barrel and the lens holding frame and inclined with respect to the circumferential direction. a sliding contact portion capable of slidingly contacting the inclined surface; a pressing member that presses the inclined surface and the sliding contact portion against each other; a first gear provided on an outer peripheral portion of the lens holding frame; A lens moving device comprising: a second gear that meshes with the first gear; and an operating member that rotates integrally with the second gear.