JPH10104491A - Lens adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens adjusting device which is equipped with a lens adjusting mechanism for focus and macrophotography adjustments of an image pickup lens and has simple constitution and is made small in size and low in cost. SOLUTION: Screw parts are formed on the inner periphery of a fixed lens barrel 10 and the outer periphery of a lens frame 20 respectively, the inner and outer peripheries which engage bo the screw parts are equipped with a ring-shaped adjusting ring 30 having a screw part; and an adjusting lever 4 is rotated to move the lens frame 20 forward and backward along the optical axis, thereby enabling conversion between a normal photography position and a macrophotography position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a close-up photographing mechanism, and more particularly to a mechanism for moving a photographing lens to a predetermined position and adjusting a focus.

[0002]

2. Description of the Related Art Conventionally, in a mechanism for adjusting the focus of a photographing lens and moving the photographing lens to a close-up photographing position, a relatively simple mechanism using a cam ring or the like is used to adjust the focus of the photographing lens or to adjust the close-up of the photographing lens. Move to the shooting position. With this configuration, there is disclosed a technique capable of shooting from a long distance to a close-up shooting with a relatively simple configuration (Japanese Utility Model Laid-Open No. 33421/1991).

[0003]

However, in the prior art, the cam ring for adjusting the focus of the photographing lens and the cam ring for moving to a predetermined position for close-up photographing are composed of different members. For this reason, there is a problem that the size of the entire apparatus increases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of the prior art, and to provide a lens barrel which holds a photographic lens and has a threaded portion in at least one portion of its outer peripheral portion. A fixed lens barrel having a threaded portion in at least one portion of a peripheral portion, and a threaded portion engaged with the threaded portion of the lens barrel on the inner periphery and a threaded portion engaged with the threaded portion of the fixed barrel on the outer periphery A lens adjusting device having a ring-shaped adjusting ring, wherein the adjusting ring integrated with the lens barrel is configured to be capable of adjusting the focus of the imaging lens and moving to another focus position. .

[0005] Further, the adjustment ring is provided with an adjustment lever for enabling the rotation of the adjustment ring and one or more fixed fitting portions for fixing the adjustment lever, and the adjustment lever is provided with a guide hole provided in the fixed lens barrel. And a lens adjustment device configured to be drivable along.

According to the above arrangement, one adjusting ring is arranged between the lens barrel and the fixed barrel, and when adjusting the focus of the taking lens, the adjusting ring is fixed, and the taking lens is centered on the optical axis. Rotate and fix the taking lens and adjustment ring at that time. Thereafter, by moving the lever fitted with the adjustment ring and rotating the adjustment ring, the photographing lens can be moved to the close-up photographing position.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an external view showing the configuration of the lens adjustment device of the present invention, FIG. 2 is a cross-sectional view showing the configuration of the lens adjustment device of FIG. 1, and FIG. 3 is an exploded view showing the configuration of the lens adjustment device of the present invention. It is a perspective view.

In FIG. 1, a fixed lens barrel 10 has a first fitting portion 11, a second fitting portion 12, and a screw portion 13 formed on an inner periphery thereof. The lens barrel 20 has an imaging lens 24 inside.
And fitted into the fixed lens barrel 10. A first fitting portion 21 and a second fitting portion 22 for fitting with the first fitting portion 11 and the second fitting portion 12 of the fixed lens barrel 10 are formed on the outer periphery of the lens barrel 20. A part 23 is formed.

The adjusting ring 30 has a screw portion 1 on an outer peripheral portion 31.
3 is formed with the same pitch as that of the first fitting portion 21 on the inner peripheral portion 32.
Between the lens barrel 20 and the corresponding screws.

The adjustment lever 4 is fixed to the adjustment ring 30 and rotates with the adjustment ring 30 so that it protrudes from the elongated hole 14 of the fixed lens barrel 10, and the rotation range is restricted by the elongated hole 14. The adjusting ring 30 is connected to the adjusting lever 4.
One or a plurality of fixing portions 33 having a groove or hole shape for fixing are formed. The pressing spring 5 is pressed and sandwiched between the adjustment ring 30 and the spring receiving portion 15 of the fixed lens barrel 10. Therefore, the adjustment ring 30 is always pressurized in the opposite direction. The CCD 6 is fixed to the CCD driving circuit board 8 by soldering with the fixing plate 7 interposed therebetween.
6, the fixed lens barrel 10 and the fixed plate 7 are fixed.

When fitting the lens barrel 20 to the fixed lens barrel 10, the adjusting ring 4 is not attached to the adjusting ring 30, and the adjusting ring 30 is fitted to the fixed lens barrel 10 with the screw portions 13, 31. Screw into place. At this time, the pressing spring 5 is in contact with the spring receiving portion 15 and sufficiently presses the adjusting ring 30. Further, the fixing portion 33 of the adjusting ring 30 for fixing the adjusting lever 4 is visible from the elongated hole 14 of the fixed lens barrel 10, and the adjusting lever 4 is in a state capable of being fixed to the fixing portion 33, and the adjusting lever 4 is fixed to the fixing portion 33. In the state, the lens frame is located closest to the CCD 6.

In this state, the lens barrel 20 is fixed to the fixed lens barrel 10.
And screwing it to a desired position while engaging the screw portion 23 with the screw portion 32 on the inner peripheral side of the adjustment ring 30. The desired position is a position where the light incident on the imaging lens 24 forms an image on the imaging surface of the CCD 6, and the focus adjustment of the imaging lens 24 is performed at this time.

Further, when there are a plurality of fixing portions 33 of the adjusting ring 30 and when one-sided blurring or the like occurs due to the mounting of the imaging lens and variation in performance, the other fixing portions 33 are set at predetermined positions. The rotation phase of the CCD 6 and the lens barrel 20 can be changed relative to the optical axis 9,
It can be adjusted to avoid problems such as one-sided blurring.

After adjusting the lens frame 20 as described above, an adhesive is injected from the fixing portion 33, and the lens frame 20, the adjustment ring 30 and the adjustment lever 4 are bonded and fixed. Here, the lens barrel 20, the adjustment ring 30, and the adjustment lever 4 move in an integrated manner.

However, since the movable range of the adjustment lever 4 is restricted by the elongated hole 14 of the fixed lens barrel 10, when the focus of the lens barrel 20 is adjusted, the adjustment lever 4 is located farthest from the CCD 6, and the adjustment lever 4 can be moved only in the opposite direction. It can be moved along the screw portion 11. When the adjustment lever 4 is moved in the opposite direction, the lens frame 20 is extended in the opposite direction to the CCD 6, and the lens frame 20 comes to the macro shooting position. Therefore, by rotating the adjustment lever 4, the lens barrel 20 moves back and forth along the optical axis 9, and can be changed between the normal shooting position and the macro shooting position.

[0016]

As described above, according to the structure of the present invention, the focus adjustment of the photographing lens and the movement to the macro photographing position can be performed by a single screw member. Accordingly, there is a remarkable effect that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view showing a configuration of a lens adjustment device of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a lens adjustment device according to the present invention.

FIG. 3 is an exploded perspective view showing the configuration of the lens adjustment device of the present invention.

[Explanation of symbols]

 Reference Signs List 4 Adjusting lever 5 Pressing spring 6 CCD 7 Fixing plate 8 CCD drive circuit 10 Fixed lens barrel 11, 21 First fitting portion 12, 22 Second fitting portion 13, 23 Screw portion 14 Slot hole 16 Fixing screw 20 Lens mirror Frame 24 Imaging lens 30 Adjustment ring 31 Outer thread part 32 Inner thread part 33 Fixed part

Claims (2)

[Claims] 1. A lens barrel holding a photographic lens and having a threaded portion in at least one portion of an outer peripheral portion thereof, a fixed lens barrel having a threaded portion in at least one portion of an inner peripheral portion thereof, and a threaded portion of the lens barrel. A ring-shaped adjusting ring having an engaging screw portion on the inner periphery and a screw portion engaging with the screw portion of the fixed lens barrel on the outer periphery, wherein the adjusting ring integrated with the lens barrel is provided. A lens adjustment device configured to be capable of adjusting the focus of an imaging lens and moving to another focus position. 2. The apparatus according to claim 1, wherein the adjusting ring includes an adjusting lever for rotating the adjusting ring and one or more fixed fitting portions for fixing the adjusting lever. The adjusting lever is provided on the fixed lens barrel. The lens adjusting device according to claim 1, wherein the lens adjusting device is configured to be drivable along the guide hole.