JPH0224611A - Stopper device for lens rotary part - Google Patents

Abstract

PURPOSE:To reduce an abutting noise generated by lens operation with a simple constitution by juxtaposing an elastic member to the either abutting surface of a 1st or 2nd stopper by providing a lens barrel rotation part with a 1st stopper and a 2nd stopper which engages the 1st stopper so as to control the rotation range of the rotation part. CONSTITUTION:When a focus ring 12 which is the rotary part of the lens barrel is rotated around the lens optical axis 19 as shown by an arrow T, the ring 12 moves as shown by an arrow U and a long-distance side stopper 13, a short- distance side stopper 14, elastic members 15 and 16, and the ring 12 rotate integrally as shown by an arrow U. Then the member 15 abuts on the fixed stopper 18. At this time, the member 15 deforms easily and elastically to absorb the energy at the time of the abutting, thereby reducing the abutting noises. When they further rotate as shown by the arrow U, the member 15 deforms elastically as shown by 15a and the long-distance side stopper 13a abuts on the fixed stopper 18 through the elastic member 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a stopper device for a lens rotating portion used in a video camera or a camera-integrated video tape recorder (hereinafter referred to as a camera-integrated VTR).

1. Conventional Techniques In recent years, with the spread of camera-integrated VTRs, the number of companies that carry cameras is increasing. Since a camera-integrated VTR records video and audio at the same time, operation sounds during shooting,
If the drive noise is high, it will be recorded on the tape as noise, and it will be extremely annoying when played back. Since the focus ring, zoom ring, etc. of the lens rotation part are operated during the shooting process, it is necessary to reduce the stopper noise during operation, especially at both ends of the rotation range.

An example of a conventional stopper device will be described below with reference to the drawings. FIG. 5 is a side view showing the configuration of a conventional stopper device used for lens viewing. A focus ring 2, which is a rotating part of the lens barrel 1, is rotatable in the X and Y directions around the lens optical axis 7.
A far end stopper 3, which is a first stopper, is provided on the rear end surface.
And a short distance end stopper 4 is provided protrudingly. Furthermore, a fixed stopper 6 that is a second stopper that engages with the first stoppers 3 and 4 is provided protruding from the lens barrel fixing portion 5 .

The operation of the conventional stopper device configured as described above will be explained. Focus ring 2 is the lens optical axis 7
When the focus ring 2 is rotated in the X direction around , the far end stopper 3 comes into contact with the fixed stopper 6, and the range of rotation of the focus ring 2 on the far side is restricted. Similarly focus ring 2
When rotated in the Y direction, the long distance side stopper 4 comes into contact with the fixed stopper 6, and the rotation range on the short distance side is restricted.

Problems to be Solved by the Invention However, in the case of the above structure, in order to ensure the strength of the stopper, it is necessary to use a hard material with high strength for the stoppers 3 and 4.
When 4.6 comes into contact, a very loud sound is generated. Therefore, if the focus ring 2 is operated during a silvery shadow, the contact sound will be recorded from the microphone onto the tape, which will not only be very harsh to the ears during playback, but will also be of poor quality.

The present invention solves the above-mentioned problems, and aims to provide a stopper device that can reduce contact noise easily and at low cost.

Means for Solving the Problems In order to solve the above-mentioned problems, a stopper device of the present invention includes a first stopper provided on a lens barrel rotating section, and a rotation stopper of the lens barrel rotating section. 1Jil! a second stopper provided on the lens barrel fixing part to engage with the first stopper, and a stopper of either the first stopper or the second stopper. On the contact side,
and an elastic member arranged in parallel adjacent to the stopper.

Effect With the above configuration, the elastic member disposed in parallel with the first stopper or the second stopper first contacts the second stopper or the first stopper, and after the elastic member is elastically deformed, the elastic member disposed in parallel with the first stopper or the second stopper contacts the second stopper or the first stopper. Rotation is prevented by the first stopper or the second stopper coming into contact with the second stopper or the first stopper. The elastic member makes it possible to significantly reduce the contact noise when the stopper comes into contact with the stopper, and since the structure is very simple, it can be realized at low cost.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a stopper device according to an embodiment of the present invention. In FIG. 1, a focus ring 12, which is a rotating part of a lens barrel 11, is rotatable in directions of arrows S and T about a lens optical axis 19.
A far end stopper 13 and a near end stopper 14, which are first stoppers, are protrudingly provided at the rear end of the motor 2. These far distance side stopper 13 and short distance side stopper 1
A thin flaky elastic member 1 is placed near the mutually opposing sides of 4.
5 and 16 are placed side by side. Further, a fixed stopper 18, which is a second stopper, is protruded from the lens barrel fixing portion 19 and engages with the long-distance side stopper 13 and the near-distance side stopper 14 via elastic members 15 and 16, respectively. .

In addition, the long-distance stopper 13, the short-distance stopper 14, and the fixed stopper 18 are made of glass reinforced polycarbonate to ensure sufficient stopper strength (
A hard material such as metal is used, while the elastic members 15 and 16 are made of a material with high elasticity such as nylon or polyacetal resin.

The operation of the stopper device configured in this way will be explained. FIG. 2 is a detailed assembly diagram illustrating the operation of the stopper device. In FIG. 1, when the focus ring 12 is rotated in the direction of arrow T around the lens optical axis 19,
In FIG. 2, the focus ring 12 moves in the direction of arrow U, and the far distance side stopper 13 and the near distance side stopper 14
The elastic members 15 and 16 also move together with the focus ring 12 in the direction indicated by the arrow. First, the elastic member 15
comes into contact with the fixed stopper 18. At this time, elastic member 1
Since 5 can be easily elastically deformed, energy at the time of contact is absorbed by the elastic deformation, and contact noise is reduced. When the elastic member 15 is further rotated in the direction of arrow U, the elastic member 15 is elastically deformed as shown by 15a, and the long-distance stopper 1
3a contacts the fixed stopper 18 with an elastic member t5a interposed therebetween. In this state, the long-distance stopper 13a and the fixed stopper 18 have sufficient strength, so that the necessary stopper strength can be ensured. focus l song 1
The same holds true when rotating 2 in the direction of arrow V.

In this way, according to the present embodiment, the stopper contact noise is suppressed by the elastic deformation of the elastic members 15 and 16 arranged in parallel on the abutment surfaces of the long-distance stopper 13 and the short-distance stopper 14 with the fixed stopper 18. can be reduced.

FIG. 3 shows another embodiment in which the elastic member is a fixed stopper 1.
Elastic members 25 and 26 are arranged in parallel on both sides of 8.

FIG. 4 shows still another embodiment, in which a moving side stopper 31, which is a first stopper, is provided protruding from the focus ring 12.
and elastic members 35 and 36 are arranged in parallel on both sides,
As fixed stoppers, a long-distance fixed stopper 38a and a short-distance fixed stopper 38b are provided on the lens barrel fixing portion 17.

Effects of the Invention As described above, according to the present invention, the first stopper provided on the lens barrel rotating portion engages with the first stopper to restrict the rotation range of the lens barrel rotating portion. In order to
By providing a second stopper that engages with the stopper and is provided on the lens barrel fixing part, and an elastic member that is arranged in parallel close to the stopper on the contact surface side of one of the stoppers, It is possible to reduce the number of people who come into contact with the stopper with a very simple configuration, and it is possible to obtain an excellent effect of significantly reducing noise caused by lens operation recorded on a tape during shooting of a camera-integrated VTR or the like.

[Brief explanation of the drawing]

FIG. 1 is a side view of a stopper device in an embodiment of the present invention, FIG. 2 is a detailed view explaining the operation of the stopper device,
FIG. 3 is a side view of a stopper device according to another embodiment of the present invention, FIG. 4 is a side view of a stopper device according to still another embodiment of the present invention, and FIG. 5 is a side view of a conventional stopper device. . 11... Lens barrel, 12... Focus ring,
13... Long distance side stopper, 14... Near distance side stopper, 15° 16... Elastic member, 17... Lens barrel fixing part, 18... Fixed stopper, 19... Lens light Shaft, 25.26...Elastic member, 31...Moving side stopper, 35.36...Elastic member, 38a. 38b... Far side and near side fixed stoppers. Agent Yoshihiro Morimoto Figure 2/9 Shi〉Su・Midwife 1e Cover υ Riichi 3rd cause Figure 4 37゛°Ih//lxL brim 0, B, 36 bullet 4 parts Figure j

Claims (1)

[Claims] 1. A first stopper provided on the lens barrel rotating section, and a lens barrel fixing section that engages with the first stopper in order to restrict the rotation range of the lens barrel rotating section. a second stopper provided on the lens; and an elastic member disposed in parallel adjacent to the stopper on the contact surface side of one of the first stopper and the second stopper. Part stopper device.