JPS60162214A - Lens moving mechanism - Google Patents

Abstract

PURPOSE:To obtain a compact, low-cost lens barrel at low cost by providing the frame of a moving lens with an engaging element which engages a nonlinear screw formed in a rod type rotating body which extends in the direction of the optical axis. CONSTITUTION:The engaging element 7 is provided to the frame 1 of the lens which is freely slidable in the lens barrel which is not shown in a figure in the direction of the optical axis to form a female screw 7'. The nonlinear screw 2' which engages the female screw 7' is formed on the surface of the rod type rotating body which extends in the direction of the optical axis. A gear 3 is fitted around the base part of the rod type rotating body 2, and a gear ring 6 is rotated manually to move back and forth the lens frame 1. Then, the rod type rotating body 2 is rotated forward and back through a clutch 4 by powering on a motor 5 to move back and forth the lens frame 1. Consequently, the compact lens barrel is manufactured precisely at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention relates to a lens moving mechanism, a lens moving mechanism that enables non-molecular movement using a trap screw (prior art).For focusing, zooming, etc. 41j for lens movement 1 is
Conventionally, a helicoidal screw mechanism has been used for linear movement, and a cam mechanism has been used for non-linear movement.

But non-by cam? The fM Sugibayashi mechanism requires a large space because the cam is installed on a cylindrical member that fits around the outer periphery of the lens frame. Generally, cam grooves are formed along the normal line of a cylindrical member, so if a cam cylinder is made by plastic molding, it will result in undercuts, which creates the problem that it is difficult to obtain a cam cylinder with desirable accuracy. In addition, the mold also had problems in terms of the need for firing, which caused a large number of splitting surfaces, the abrasion of the mold, and the cost. On the other hand, making it from metal not only increases costs but also limits how compact it can be made.

Although it is known that the lens is moved by means of a screw along the outer periphery of the lens, there is no known method of moving the lens using a screw.

(Invention V) Purpose) This invention attempts to obtain a lens movement A2 structure that does not involve the above problems by moving the lens frame using a non-rim type screw extending in the optical axis direction along the outer edge of the lens frame Q. That is.

(Structure of the Invention) The lens movement 'kJJ mechanism of the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the structure of the lens moving machine box of the present invention, in which the outer periphery of a lens frame 1 of a moving lens is slidably fitted in a cylinder (not shown). The edge-shaped screw 2 extends in the direction of the optical axis. This nonlinear screw 2 is driven by a motor 5 via a clutch 4. Apart from this, the non-type screw 2 has a gear 3, and the gear 3 meshes with a plane on the inner circumference of the zoom ring 6.
As shown in the partially enlarged view of FIG. 2, the non-linear screw 2'7) is fixed so that the engagement element 7 is mated to the lens frame 1 and is rotatable about the normal line of the lens frame l. The groove 7' at its tip engages the thread 2' of the non-edge thread 2V).

When the y is rotated by a motor, by passing it through the motor 5, the cedar screw 2 is rotated through the clutch 4, and the screw thread 2' is turned through the engager 7. Move the lens frame 1f. At this time, the engaging element 7 rotates around its axis in accordance with the thread 2', and continues to do so regardless of the change in the slope of the thread 2'. DI 117' maintains P/M contact with thread 2' and drives the internal groove.

In the case of manual operation, when the zoom ring 6 is rotated, the rotation is caused by the nonlinear screw 2Ki via the gear 3, and the lens frame 1 is moved. At this time θ, the clutch 4 is disconnected and the motor 5 does not rotate.

The non-linear screw 2 as described above may be installed in one or multiple ridges per valley lens movement frame. However, when the movement ranges of two or more lens frames Q do not overlap, the third
It goes without saying that two or more lens frames such as 1.1' can be moved by one nonlinear screw 2 as shown in ◎
(Effects of the Invention) Since the present invention has the above-mentioned configuration, ■ The non-N type screw convex shape that is the lens movement guide part is defective], and undercuts do not occur even when plastic molding or compact casting is carried out. Since it is possible to create an accurate thread shape, the cost can be reduced compared to the cam method.

(2) Since the driving member is an additional screw, and the space for the cam is not mounted, there are remarkable effects such as the ability to create a compact lens barrel.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the lens transfer l1lIJ machine of this invention.
Fig. 3 is a conceptual diagram of the configuration of Fi turtle's IM row. 1: Moving lens frame 2: Non-edge type screw 3: Gear 4: Clutch 5: Motor 6: Zoom ring 7: Lens frame holder Patent applicant Konishi Roku'4 Shin Kogyo Aji Shiki Company Applicant Saniri
Patent attorney Sato 1 sentence Male (1 other person)

Claims (1)

[Claims] 1) A lens moving mechanism characterized by having a rotating body having a non-linear screw, and an engaging element that is provided on the lens of a moving lens and engages with the rotating body υ screw. 3) The lens moving mechanism according to claim 1, wherein the screw is made by molding. 3) The rotating body is a rod-shaped member disposed around the lens tip and extending in the direction of the original axis. The lens moving mechanism according to claim 11, which is a rotating body.