JPS60130709A - Fixing device for internal tube and external tube of lens barrel - Google Patents

Abstract

PURPOSE:To facilitate assembly and adjustment and to prevent parts from being strained owing to the clamping of a screw, etc., by fixing a dowel and an external tube with an adhesive tape while the head of the dowel is engaged closely with the step part of the hole of the external tube and the leg part is fitted closely in the hole of an inner tube. CONSTITUTION:At least one hole 18 having at least stepped grooves 18a and 18b is formed in the external tube 1, and holes 19 as many as said holes 18 are formed in the flange 3 of the inner tube 2. Then, the external tube 1 and internal tube 2 are engaged and the leg part 20a of the dowel 20 is fitted in a hole 19 of the flange 3 or the internal tube 2. Then, the head part 20b of the dowel 20 moves onto the step part of the hole 18, so that the top surface of the head part 20b is at the same height with the outer circumferential surface of the external tube 1. An adhesive tape 21 is stuck thereupon to fix the external tube 1 and internal tube 2. Therefore, the fitting position of the external tube 1 to the internal cylinder 2 is adjusted by removing the adhesive tape 21 without detaching parts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field) The present invention relates to improvements in lens barrels, particularly movable barrels that are operated from the outside, such as distance adjustment rings and zoom rings.

(Prior Art) It is known to use a double helicoid mechanism in a lens barrel to adjust the distance required for photographing (11).

That is, as shown in FIG. 1, the holding cylinders holding the lenses L, L2 are moved left and right by ffI movement, and are moved linearly by the guide key 9 facing the fixed cylinder 7rC. 1
The outer cylinder (external operation ring) for the safety distance w and island section is rotatable with respect to the fixed cylinder 7, and also movable along the optical axis direction.

A flange 4 is JOB'd to the outer flfll, and is fixed to the flange 3 of the cylinder 2 by means of fixing means 6 such as screws or screws. A helicoid is formed on the inner cylinder 2Zll''3 outer JA1 surface, and the valley Vil! ! A first helicoid coupling 12 and a second helicoid coupling 13 are formed with the inner peripheral surface of the eleven-legged tube 9, the outer periphery of the lens holder @8, and the b helicoid.

Therefore, when the outer cylinder 1 is rotated, the inner cylinder r@2 is also rotated at the same time, and since the identification cylinder 7 is kept constant, the first helicoidal coupling 1
2, the outer cylinder 1 and the inner cylinder 2 move nine times along the optical axis direction. Since the medical cylinder 8 cannot be rotated by the guide key 9, it moves in the direction of the optical axis according to the second helicoidal connection 13, and when the lens is closed, the position of the lens is at the end of the mouth cylinder lQ, which is connected to the #I4 node. Usually, there is a scale (several meters to oo) on the side that shows the photographing distance according to the rotation angle of the outer cylinder 1, and marks indicating these distances are engraved on the carrying surface of the fixed cylinder 7. The mechanism clearly indicates the shooting distance of the lens. In such a one-table disease, the position of the outer cylinder 1O scale, the shooting distance of the lens (for example, oo), the lens L1, and the actual position of the bow (ω
) must match the regular cone. As a result, the outer cylinder 1 becomes stiff and has a stiff foot with respect to the inner cylinder 2, and when assembled, it becomes slightly distorted.

FIGS. 2(a) to 2(f) therefore show a conventional relay of the V mechanism.

Figure 2- (a)! 7) In the case of U, a low flange 4 is formed on the inner surface of the outer cylinder 1O, and a simple flange 3 is formed on the outer periphery of the -J cylinder 2Q. By tightening the screw 6, the top part 6a of the screw presses the peripheral surface of the flange 4, and the outer cylinder 1 and the inner cylinder 2 are held together. Figure 2- (b) υ
In addition, an elongated hole 5 is provided in the flange 4 of the outer cylinder 1 so that the screw 6 can be adjusted slightly within the elongated hole 5. Figure 2
- In the conventional example of (e), a long hole 15 is provided in the direction of the outer cylinder 1υj, and a screw 6 is fitted to the circumferential surface of the inner cylinder 1f7) flange 3, and this is tightened. This is to seal the outer cylinder 1. In Fig. 2-(d), the conventional shiodesu is the outer cylinder 1.
A screw hole 9 is provided in the flange 3, and the inner cylinder 1 is fixed by tightening it to the flange 3 (the carrying surface may be knurled or grooved) using something like a tip screw 6'. In the conventional case in Fig. 2-(e), the outer cylinder l is attached to the front part 1.
It is divided into two parts, '' and part 1, sandwiching the flange 3 of the inner cylinder 2, so that the outer peripheral surfaces of the outer cylinder 1.1 and 7 rank 3υ have the same dullness. And by fixing these with tape 16 or the like, it will be υ. Figure 2
- (f) is a conventional joint of Fig. 2- (IJ), and the outer cylinder 1 and inner cylinder 2 are jointly formed into an annular reinforcement material 17 by Lee Shiro. It is a target to determine Ll (Unexamined Patent Publication No. 54-103026
No. 11f).

As mentioned above, in the past, the outer cylinder 61 and the inner cylinder 2 were fixed in an adjustable manner using the Fi-force method, but all of the fittings had the following drawbacks.〇1. When making adjustments, especially in the cases of Figures 1(a), (b), and (f), be sure to remove the parts in front of the mounting screws [7] This must be done before installation.

2. When using a sword tip screw, the tip of the screw may become misaligned due to strong rotational force.

3 In the case of Figs. 2-(a) to (e), if both the outer cylinder 1 and the inner cylinder 2 are made of plastic molded parts, the entire assembly due to the decoration of screws and U-screws will not affect the inner cylinder 2. However, it does not affect the operating function.

4. Before installing the inner cylinder, the outer cylinder must already be assembled.

5 Figures 2(a) to (d) 'DIf you have adjusted once using either method, when you need to fine-tune the JPr, the initial adjustment will cause pressure from tightening the screws, so you will not be able to fine-tune it again. Have difficulty.

6. In FIG. 2-(f), the above-mentioned defect can be eliminated, but the hole 3a of the flange of the inner cylinder must meet the hole 17a of the annular reinforcing member 17v, which requires more time than the old method.

The above problem is not limited to distance joint rings, but occurs in cases such as zoom rings where it is necessary to separate the inner cylinder and the outer cylinder by 11 degrees.

(Object of the Invention) The present invention eliminates the above-mentioned disadvantages of the conventional art, and it is possible to assemble and remove the parts without causing distortion of the parts due to tightening of screws or the like. Harden the cylinder and inner cylinder
This is a way to excite the e-book transaction.

(Structure of the invention) Based on the drawings below, 〇1 that reads out ``non-explosion ψ'' is the outer cylinder and 2
is the inner cylinder, and the inner cylinder 2VC is provided with a flange 3. i'J, 'M'Aj* 18 a, 18 on outer cylinder 1
The flange 3 of the inner cylinder 2 is provided with holes 19 corresponding to the hole 18. Part 20b
It is a piece having a foot portion 20a that has a hole (19).The hole 18 may be a long hole.

In such a device, the outer cylinder 1 is fitted into the inner cylinder 2 if it is fitted. Next, the foot 20a of the top 20 is fitted into the large 19 of the flange 3 of the inner cylinder 2.

Then, the head 20b rests on the stepped portion of the hole 18, and the top surface of the head 20b becomes the same surface as the outer peripheral surface of the outer cylinder 1. Further, the outer tube 1 is fixed to the inner tube 2 by fixing the top thereof with an adhesive tape 21.

(Effects of the invention) According to this method, 1) By peeling off the adhesive tape 21 without removing most of the parts, the mounting position for the outer cylinder i'y:+h direction 2 is changed to 1.
Can stand vertically. Therefore, after assembling all the parts,
You can adjust the positioning position.

2) 19.181L, 20m and 18b120b
In addition, 19, zoav) it fitting H only needs to eliminate the shape of each other parts and hold it l, 20 is fixed with adhesive tool 1
21 is attached, especially the valley parts are made of synthetic W.
Even when using soft materials such as fat, there is no deformation due to installation.

3) If the hole 18 is a long hole, fine adjustment can be made by shifting the position of the piece 20.

4) Since the size 19 is a pure size and does not have a threaded part, the time and effort required for tag processing etc. is comparatively low, and it is also convenient in terms of parts processing.

5) Adhesive tape 19V is sufficiently stiff and is unlikely to shear during operation.

It has the following advantages.

In Crane 3, the head 20b of top 20 is square, but the shape can be any shape as long as 18b and 20b meet (N in 4th figure). Also, the head 20 of top 20
b may be a cursor, but the curve r should be adjusted according to the shape of the outsider 1.
From the I31 and 3° records (Figure 5), it is clear that it is 艮と.

Furthermore, the frame 20 does not have to be in the shape of a mantle as shown in Figures 3 to 5 υ. This reduces the number of parts and is also advantageous in terms of parts management.0 As described above, the mechanism of the present invention allows the fixation of the inner and outer cylinders to be easily and reliably fixed, and to be easily adjustable during assembly. O does not occur

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 and 2 show the conventional fixing device for the inner and outer cylinders, Figure 3 shows the fixing device for the inner and outer cylinders according to the present invention, and Figures 4.5.6 show the top used in the present invention. Example 4. L2: Lens 1: Outer tube (lens lens) 2: Inner tube 3: Flange of P-3 tube
4: Outer tube 7. Rank 5: Long hole 6: Screw 7: Fixed tube 8: Lens holding tube 9: Draft (c) key 10: Frame 1
1: Fixing screw 12; First helicoid connection 13: Second helicoid connection 15: Long hole in outer cylinder 16: M tag 1
7: vIi19fL ring 18: Hole 18a, b: [Groove 1
9: Hole 2Q: Piece 20a: Piece foot 20b: Corr
Part g4 21: Adhesive tape % Discharge person Roku Konishi Mukogyo Ajishikiai Applicant's agent Patent attorney Fumi Sato Ka 1 [Me1 Figure 2 [1 Figure 4 181 1bl lc'1 aS Figure 1 al t b + Figure 6 bl dl

Claims (1)

[Claims] In a lens barrel having an outer cylinder and an inner cylinder that moves together with the outer cylinder, the outer cylinder has a plurality of holes having stepped portions;
The inner cylinder has a plurality of eights at positions corresponding to the wire holes, and furthermore, the head part is tightly fitted to the stepped part of the outer cylinder V wire hole, and the foot part is tightly fitted to the cylinder V part, Inner cylinder and outer cylinder vtI consisting of adhesive tape that holds the frame and outer cylinder constant! iI constant device.