JPS6032011A - Moving device of lens - Google Patents

Abstract

PURPOSE:To constitute a simple and compact device, to mold the shapes of the components easily with resin and to reduce the production cost by forming a gear meshed with the rack of an operation ring and a member rotating unitedly with the gear and moving a lens holding frame by said rotating member. CONSTITUTION:The titled device consists of a fixed cylinder 1 fixed on a camera or the like, the operation ring 2 and a sliding cylinder 4 to be used also as a lens holding frame. A shaft 3c is penetrated freely turnable into the fixed cylinder 1 and the gear 3 meshed with the rack part 2a of the operation ring 2 and a rotary board 3a setting up a pin 3b to be inserted into the peripheral groove 4a of the lens holding frame 4 are fixed on one side of the shaft 3c and the other side respectively. A straight guiding plate 5 on which the lens holding frame 4 is set up so as to be driven straightly without rotation is straightly guided by a straight groove 1a formed on the fixed cylinder 1. When the operation ring 2 is rotated, the rack part 2a of the operation ring rotates the gear 3, so that the rotary board 3a fixed unitedly with the gear 3 is also rotated. Since the pin 3b set up in the rotary board 3b is inserted into the peripheral groove 3a of the lens holding frame 4, the rotation of the rotary board 3a slides the lens holding frame 4 forward and backward.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of Kao Tojo) The present invention relates to a lens moving device, and particularly to a lens moving device used for extending a lens for focusing.

(Prior art) At present, costs have been reduced, especially in cameras that use close-focus lenses, gold M parts have been replaced with resin molded parts, engravings have become engravings, and there have been major changes to alumite printing. .

At present, the cost of the partial Fi focusing hand and exposure means has not yet been reduced.

Of these, most of the focusing means of photographic lenses are based on helicoid screws. This helicoid screw
Since the lens group is required to move in a straight line due to the aperture control fi11m structure, it is configured as a double helicoid.

For this reason, four large parts are essential: an operating ring, a fixed barrel, a female helicoid, and a male helicoid, and helicoid screws must be formed in four locations. Even if an attempt is made to make this into a resin, it is difficult to make a mold, the mold is expensive, and there are also problems in the environmental resistance technology for resin parts.

Additionally, cam grooves are widely used as lens moving devices for zoom lenses for zooming, but it is also extremely difficult to make them into resin.

As a lens movement + stage of that pond, Lac Hinion is,
Focusing operation time becomes longer and #! The end face cam, which cannot be made compact in structure and is expensive, is easy to disassemble using resin, but requires a biasing means to keep the follower in constant contact with the cam face, and if the amount of movement is large, it will be difficult to operate. It cannot be used if the change in force required is large.

A moving device using a sliding cylinder has a simple structure and short focusing operation time, but it is inevitably inaccurate due to minute movements.

(Purpose of the Invention) The present invention proposes a new structure for a lens moving device based on resin, and aims to obtain a low-cost lens moving device that does not have the drawbacks of conventional moving devices. It is.

(First aspect of the invention) As shown in the drawings, the lens moving device of the present invention includes a fixed barrel 1 fixed to a camera or the like, an operating f-ring 2, and a sliding motion 4 which also serves as a lens holding frame.

A shaft 3C rotatably passes through the fixed barrel 1, and on one side of the shaft 3C there is a gear 3 that meshes with the rack part 2a of the operating ring 2, and on the other side there is a circumferential groove 4a of the lens holding frame 4. Pin 3b that fits into
A rotary plate 3a on which is erected is fixed. Reference numeral 5 denotes a linear guide plate provided so that the lens holding frame 4 moves back and forth without rotating, and is guided in a straight line by a straight helix groove 1a provided in the fixed barrel 1.

By rotating the operating ring 2, the rack portion 2a of the operating ring
rotates the gear 3, and the rotating plate 3 is attached integrally with the gear 3.
& is rotated. Since the pin 3b set on the rotating plate 3a is fitted in the circumferential direction #14a of the lens holding frame 4, rotation of the rotating plate aav results in υ sliding movement toward the front and back of the lens holding frame 4v.

Of the above t#, the gear Q rotation angle can be freely selected, and the gear 3 can be a semi-disc. By rotating in the direction υ, endless focusing operations are possible from ω to close range and beyond.Also, when the rotation of the gear is small, the pin can be placed directly on the gear.
f#i glare, fixed barrel g) groove may be ejected to engage the lens holding frame.

(Effects of the Invention) The present invention has the above-mentioned Q#l configuration, and 1) A simple and compact lens moving device can be obtained.

2) The shape of the IN component can be easily molded with resin,
Low cost can be achieved.

3) Inevitably, the amount of lens movement and operation ring operation are not constant, and the distance must be selected in accordance with the lens characteristics, such as fine distance m> on the long distance side and harsh distance on the short distance side, or vice versa. I can do it.

4) A click is provided at the position so that focusing can be done by rotating the operating ring in either direction, allowing the user to select the desired focus.

5) Work/dress 7 orcasing becomes possible as described above.

6) Distance lens I and ring are separately attached and only the rotary plate is prepared individually. Large parts can be shared for lenses with focal lengths within a certain range, which significantly reduces costs. mouth that can be reduced

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the mounting part of the lens moving device of the present invention, and FIG.
The figure is also a perspective view of the exhibition space 1: Identification cylinder 2: Operation ring 3: Gear 3a: Rotating plate 3
b; Pin 4: Lens holding frame 4 &: Groove 5: Straight guide plate Patent applicant Roku Konishi Photographer Eimi Nihoshi Applicant f (Embedded Patent attorney S7i: Fumi Fuji (and 1 other person)

Claims (1)

[Claims] An identification tube, an operation ring rotatably held by the fixed tube, and a lens holding frame slidably held by the fixed tube, and a rack supported by the fixed tube and attached to the rack of the operation ring. A lens moving device comprising a gear that meshes with the gear and a member that rotates integrally with the gear, and a lens holding frame is moved by the rotating member.