JP3770852B2 - Macro shooting lens feeding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a macro shooting lens feeding device in an optical system device, and more specifically, includes a focus adjustment mechanism for a shooting lens and a switching mechanism between a normal shooting mode and a macro shooting mode, and switches between a normal shooting mode and a macro shooting mode. The present invention relates to a lens taking-out apparatus for macro photography that is small and has a small number of parts and is compact.
[0002]
[Prior art]
In a conventional optical system device, as a general configuration for adjusting the focus at the time of assembly, a concave or convex cam is provided on a drive ring that is inserted into a lens barrel and rotatably supported, and further, a convex or concave cam. The drive ring is incorporated into a ring-shaped feeding member provided with a lens barrel, and the driving ring provided with a concave or convex cam is rotated to ride on the convex or concave cam provided on the feeding member. A focus adjustment mechanism is known in which the lens is moved forward (protruded) and the lens is moved to the focal position at the time of photographing. (See Japanese Utility Model Publication No. 3-33421)
[0003]
In addition, as another example, it is an object to provide a low-cost lens adjustment device that includes a lens adjustment mechanism that performs focus adjustment and macro adjustment of an imaging lens, and has a simple configuration and is downsized. Each lens barrel has a cam portion, and a ring-shaped adjustment ring having cam portions engaged with both cam portions at both ends. By rotating the adjustment ring, the lens barrel is placed on the optical axis. There is known a lens adjustment device that can be moved back and forth along and can be converted into a normal photographing position and a macro photographing position. Further, it also describes that the fixed barrel and the lens barrel are coupled with each other by a screw portion to perform focus adjustment. (See JP-A-10-170809)
[0004]
[Problems to be solved by the invention]
In the case of a focus adjustment mechanism as described in Japanese Utility Model Publication No. 3-33421, it is necessary to uniformly align the heights of the concave or convex cams provided on the feeding member and the drive ring. The cam height varies and the lens is inclined with respect to the imaging surface. Further, a member that always presses the assembled component against the fixed main body side and prevents the member from falling off is necessary, and there is a problem that the overall size increases.
[0005]
FIG. 4 is a perspective view showing a leaf spring used in a conventional focus adjustment mechanism.
As an elastic body that presses the assembled component against the fixed main body side, there are a leaf spring as shown in FIG. 4 used in a conventional focus adjustment mechanism and a coil spring as used in a conventional lens adjustment device. In the case of a leaf spring as shown in FIG. 4, it is difficult to apply a load uniformly due to variation or deformation of the bending angle, and in the case of a coil spring, there is a problem that a space is required in the compression direction of the spring and the product shape becomes large.
In addition, when the cam mechanism used for the switching mechanism between the normal shooting mode and the macro shooting mode is easily replaced with a screw mechanism (normal screw), the screw lead of the screw mechanism is constrained, and when the feed amount is increased, the rotation angle is large. As a result, there is a problem that the operability deteriorates.
[0006]
Also, in an optical system device, when a lens barrel is rotatably attached to a lens frame and the lens barrel is moved in the axial direction by rotating the lens barrel, the rotation operation and the axial movement operation are smoothed. Therefore, a slight gap (play) is required in the radial direction between the lens frame and the lens barrel, but the play of this gap causes a deviation from the optical axis of the lens barrel, and the lens incorporated in the lens barrel. There is a risk that the optical axis shift of the image sensor fixed to the lens frame side will be caused and the imaging performance will be lowered.
[0007]
The present invention has been made in view of the above circumstances, and in a macro shooting lens feeding device capable of switching between a normal shooting mode and a macro shooting mode, the number of components is reduced to make the product shape compact, and the normal shooting mode The objective is to improve the operability by reducing the amount of rotation operation without causing an optical axis shift during the switching operation of the macro shooting mode.
[0008]
[Means for Solving the Problems]
According to a first technical means of the present invention, in a macro shooting lens feeding device in an optical apparatus provided with a focus adjustment mechanism of a shooting lens and a switching mechanism between a normal shooting mode and a macro shooting mode, an image sensor is provided at the bottom center. A holder having an attachment hole in which a multi- thread female screw is formed in an inner diameter portion, and a multi-thread male screw disposed in the attachment hole of the holder and screwed into the multi-thread female screw of the holder in an outer diameter portion and feeding ring female screw for focus adjustment Rutotomoni bore screw is formed is formed, different inner and outer rings diameters are connected by a connecting member concentrically, the whole is formed in a concave shape double An elastic body having a ring structure, wherein the inner ring portion is supported by a bottom surface portion of the holder, and the outer ring portion is in contact with a lower end of the feeding ring and serves as a load portion; Out is arranged inside the ring, and a lens barrel male screw is formed to be screwed with the female screw of the feeding ring to the outer diameter, it is rotated by a predetermined angle to the feeding ring in the mounting hole of the holder Accordingly , the present invention is characterized in that the macro shooting lens feeding device is characterized in that normal shooting and macro shooting can be selected.
[0009]
According to a second technical means of the present invention, in the macro photographing lens feeding device of the first technical means, the feeding ring includes an operation knob, and the operation knob cooperates with a stopper portion on the holder side. A stopper convex portion having two end portions as a macro photographing side stopper and a normal photographing side stopper for defining the rotation of the feeding ring by the predetermined angle is provided .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS.
1 is an exploded perspective view showing a macro photographing lens feeding device according to an embodiment of the present invention, FIG. 2 is a front view of the macro photographing lens feeding device, and FIG. 3 is a sectional view taken along line XX in FIG. .
A macro shooting lens feeding device according to an embodiment of the present invention includes a holder 10 in which an image pickup device such as a CCD is incorporated, an elastic body 20 for preventing rattling of members incorporated in the holder 10, a feeding ring 30, and a lens group. Is constructed of a lens barrel 40, an operation knob 50, and the like.
[0014]
The holder 10 is a base for a macro photographing lens feeding device, and includes a mounting member 11 for mounting and mounting a component member at the center. For example, three multi-thread female screws 12 are formed in the inner diameter portion of the mounting hole 11. An elastic body support portion 13 that supports an elastic body, which will be described later, is formed on the bottom portion, and is configured to hold an image sensor 60 made of a CCD or the like at the center of the bottom portion. Further, a macro photographing stopper 14 and a normal photographing stopper 15 are provided around the mounting hole 11 on the surface of the holder 10.
The elastic body 20 has a double ring structure in which an inner ring 21 and an outer ring 22 having different diameters are concentrically connected by a connecting member 23 and are formed in a concave shape as a whole, and the inner ring 21 is formed in the mounting hole 11 of the holder 10. The outer ring 22 is a load portion that is supported by the elastic body support portion 13 and comes into contact with the lower end of a feeding ring 30 described later.
[0015]
Here, when the payout ring 30 is attached to the attachment hole 11 of the holder 10, the payout ring 30 rotates smoothly with respect to the holder 10, so that the payout ring 30 moves smoothly in the axial direction. A slight gap (play) is provided in the radial direction between the multiple thread male screw 32 and the multiple thread female thread 12 of the holder 10. The play based on this gap may cause a deviation of the optical axis between the feeding ring 30 and the holder 10.
In this embodiment, the elastic body 20 is interposed between the holder 10 and the feeding ring 30, the inner ring 21 of the elastic body 20 is supported by the elastic body support portion 13 of the holder 10, and the outer ring 22 of the elastic body 20 is fed out. Since the lower end portion of the ring 30 is supported, the multi-thread male screw 32 of the feeding ring 30 is pressed against the multi-thread female screw 12 of the holder 10 by the elastic body 20. The optical axis shift is corrected by being automatically moved to the center of the holder 10 along the screw slope of the screw 12.
[0016]
The feeding ring 30 is formed in a ring shape having a flange 31 at one end, and is composed of, for example, three threads that are screwed into the outer diameter portion of the ring-shaped portion with the multi-thread female screw 12 formed in the inner diameter portion of the mounting hole 11 of the holder 10. A multi-thread male screw 32 is formed, and a focus adjustment female screw 33 that is screwed with a focus adjustment male screw 42 formed in a lens barrel 40 described later is formed on the inner diameter portion of the ring-shaped portion. Here, the focus adjusting female screw 33 and the focus adjusting male screw 42 formed on the lens barrel 40 are usually one normal screw, but a multi-thread can also be used.
In addition, a ring having a knob rotation prevention knurl 34 formed on the outer peripheral surface thereof is protruded on the upper surface of the flange 31, and knob drop-off prevention claws 35 are protruded at two locations on the upper surface of the flange 31.
[0017]
The lens barrel 40 includes a lens group 41, and a focus adjusting male screw 42 that is screwed with a focus adjusting female screw 33 formed on the feeding ring 30 is formed on the outer diameter portion. The lens barrel 40 is rotated by a drive mechanism (not shown) and is configured to move forward and backward on the optical axis with respect to the feeding ring 30.
The operation knob 50 has a ring shape, a knob rotation prevention knurl 51 is formed on the inner surface, and a claw hook hole 52 that engages with two knob dropout prevention claws 35 formed on the flange 31 of the feeding ring 30. Is formed. In addition, a knob-shaped shooting switching operation portion 53 is provided projecting outward, and a stopper projection 54 is formed over a certain length of the circumference of the portion facing the shooting switching operation portion 53, and the stopper projection One end of the portion 54 acts as a macro photographing side stopper 55 and the other end acts as a normal photographing side stopper 56.
[0018]
Next, the assembly configuration of each component will be described.
First, the image pickup device 60 made of a CCD or the like is held on the bottom of the holder 10 by an appropriate means, and the inner ring 21 of the elastic body 20 is placed on the elastic body support portion 13 of the attachment hole 11.
The multi-thread male screw 32 of the feeding ring 30 is screwed into the multi-thread female screw 12 formed in the inner diameter portion of the mounting hole 11 of the holder 10, and once screwed to the final end, the knob drop prevention claw provided on the feeding ring 30 35 is returned to the center of the macro photography stopper 14 and the normal photography stopper 15 formed on the holder 10. In this state, the knob rotation prevention knurl 51 of the operation knob 50 is fitted to the knob rotation prevention knurl 34 of the feeding ring 30, and the claw hook holes 52 of the operation knob 50 are formed in the two knob dropout prevention claws 35 of the feeding ring 30. By engaging, the operation knob 50 is held on the flange 31.
[0019]
Thereafter, the operation knob 50 is rotated to a position where the normal photographing stopper 15 and the normal photographing side stopper 56 of the operation knob 50 come into contact with each other. In this state, the focus adjustment male screw 42 formed in the lens barrel 40 is screwed into the focus adjustment female screw 33 at the time of normal shooting of the feeding ring 30 to a position where the normal shooting focus is obtained. 2. It will be in the state of FIG.
From this state, by rotating the operation knob 50 to a position where the macro shooting stopper 14 and the macro shooting side stopper 55 of the operation knob 50 come into contact with each other, the knob rotation prevention knurl 51 of the operation knob 50 and the knob rotation of the feeding ring 30 are rotated. Due to the fitting of the prevention knurl 34, the feeding ring 30 rotates along the multi-thread female screw 12, and as a result, the lens barrel 40 screwed into the feeding ring 30 moves in the optical axis direction from the image sensor 60. The focal point at the most distant macro shooting distance can be obtained.
[0020]
In this embodiment, the multi-thread female screw 12 of the holder 10 and the multi-thread male thread 32 of the feeding ring 30 are formed by, for example, a triple thread, but the rotational motion is not limited to three but has an appropriate size as a screw cam. Any screw lead may be used as long as it has a function of converting into linear motion.
Further, even if play occurs in the multi-threaded screw portion due to processing accuracy or wear, the feeding ring 30 is always loaded in a certain direction by the elastic body 20, so that deterioration in photographing performance due to play is avoided. Can do.
The elastic body 20 is supported by an elastic body support portion 13 formed in a ring shape on the holder 10, and a load point for supporting the feeding ring 30 is an outer peripheral width portion of the outer ring 22, and the elastic body 20 on the feeding ring 30 side. A spherical portion can be formed at, for example, three portions of the contact portion.
The macro shooting distance is determined by the rotation angle of the operation knob 50. This rotation angle is the opening angle of the macro shooting stopper 14 and the normal shooting stopper 15 provided in the holder 10, or the stopper provided in the operation knob 50. The macro photographing distance can be changed by changing the opening angle between the macro photographing side stopper 55 and the normal photographing side stopper 56 of the convex portion 54.
[0021]
【The invention's effect】
As is apparent from the above description, members such as a holder, a feeding ring, a lens barrel, and an operation knob incorporated as components of the lens taking-out device for macro photography according to the present invention are a fastening part, a welding process, and a bonding process. The holder, feeding ring, and lens barrel can be assembled by screw connection, so that all parts can be assembled as a single module without dropping, and a compact structure consisting of a small number of parts. A macro photographing lens feeding device can be provided.
In addition, a multi-thread screw mechanism that can increase the screw lead for a small screw pitch is used for switching between the normal shooting mode and the macro shooting mode, so that a large amount of axial movement can be obtained with a small amount of rotation of the operation knob. It is possible to provide a macro photographing lens feeding device with good operability.
[0022]
Further, since the elastic body is interposed between the holder and the feeding ring, even if there is a slight gap between the holder and the feeding ring to facilitate the operation, the feeding ring is moved along the multi-thread female thread of the holder. It moves automatically to the optical axis and does not cause a deviation of the optical axis between them.
In addition, since the elastic body has a configuration in which the inner ring and the outer ring are connected by a connecting member, it is possible to uniformly apply a load to each part, and there is little space in the compression direction of the spring, and the product shape is made compact. be able to.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a lens taking-out device for macro photography according to an embodiment of the present invention.
FIG. 2 is a front view of a macro photographing lens feeding device.
3 is a cross-sectional view taken along line XX in FIG.
FIG. 4 is a perspective view showing a conventional elastic body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Holder, 11 ... Mounting hole, 12 ... Multiple thread internal thread, 13 ... Elastic body support part, 14 ... Stopper for macro photography, 15 ... Stopper for normal photography, 20 ... Elastic body, 21 ... Inner ring, 22 ... Outer side Ring, 23 ... Connecting member, 30 ... Feeding ring, 31 ... Flange, 32 ... Multi-thread male screw, 33 ... Female screw for focus adjustment, 34 ... Knob rotation prevention knurl, 35 ... Knob drop prevention claw, 40 ... Lens barrel, DESCRIPTION OF SYMBOLS 41 ... Lens group, 42 ... Male screw for focus adjustment, 50 ... Operation knob, 51 ... Knob rotation prevention knurl, 52 ... Claw hook hole, 53 ... Shooting switching operation part, 54 ... Stopper convex part, 55 ... Macro shooting side stopper 56: Normal photographing side stopper, 60: Image sensor.

Claims (2)

In a macro shooting lens feeding device in an optical apparatus provided with a focus adjustment mechanism of a shooting lens and a switching mechanism between a normal shooting mode and a macro shooting mode,
A holder having an attachment hole in which an image sensor is arranged in the center of the bottom and a multi-thread female screw is formed in the inner diameter part;
Disposed in the mounting hole of the holder, the feeding ring of the female screw for focus adjustment to the multi-strip Rutotomoni bore Tajoyu screw is formed to be screwed to the female screw of the holder to the outer diameter portion is formed When,
An inner ring and an outer ring having different diameters are concentrically connected by a connecting member, and are an elastic body having a double ring structure formed entirely in a concave shape, and the inner ring portion is supported by a bottom surface portion of the holder, An elastic body in which the outer ring portion comes into contact with the lower end of the feeding ring and becomes a load portion;
A lens barrel that is disposed inside the feeding ring and has an outer diameter portion formed with a male screw that is screwed with a female screw of the feeding ring;
Macro lens feeding device, wherein the normal photographing and macro shooting by Rukoto is rotated by a predetermined angle in the mounting hole of the holder of the feeding ring can be selected. 2. The macro shooting lens feeding device according to claim 1, wherein the feeding ring includes an operation knob, and the operation knob defines the rotation of the feeding ring by the predetermined angle in cooperation with a stopper portion on the holder side. A macro photographing lens feeding device comprising a stopper convex portion having two ends as a macro photographing side stopper and a normal photographing side stopper .

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