JP3731327B2 - Lens barrel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a lens barrel.
[0002]
[Prior art]
As zoom lens barrels, for example, (1) Japanese Patent Laid-Open No. 5-232369 “Zoom Lens Barrel” and (2) Japanese Patent Laid-Open No. 8-262309 “Zoom Lens Barrel” are known.
In the above (1), according to FIGS. 1 to 3, the lens barrel 103 is formed with the shaft support recesses 111a, 113a, 112a, 114a, and the lens barrel 201 has the shaft restrainers 202, 203, 204, 205. The upper guide rod 121 is inserted into the shaft supporting recesses 111a and 113a, the lower guide rod 122 is inserted into the shaft supporting recesses 112a and 114a, the cover member 201 is covered on the box 103, and the shaft restrainers 202, 203, 204, In 205, the upper guide rod 121 and the lower guide rod 122 are fixedly supported.
[0003]
According to the above (2), according to FIGS. 1 to 3, the notch portions 112a, 112a, 112b, and 112b are formed in the box 11, and the guide shaft holding portions 121a, 121a, 121b, and 121b are formed in the lid member 12. The guide shaft 111a is inserted into the notches 112a and 112a, the guide shaft 111b is inserted into the notches 112b and 112b, the cover member 12 is covered on the box 11, and the guide shaft holder 121a, The guide shafts 111a and 111b are elastically pressed by 121a, 121b and 121b.
[0004]
[Problems to be solved by the invention]
However, in the above {circle around (1)}, the upper guide rod 121 is inserted into the shaft support recesses 111a and 113a, the lower guide rod 122 is inserted into the shaft support recesses 112a and 114a, the cover member 201 is put on the box 103, and the shaft restrainer 202 is inserted. , 203, 204, 205 when the upper guide bar 121 and the lower guide bar 122 are fixedly supported, the upper guide bar 121 or the lower guide bar 122 may be loose due to variations in the shaft restrainers 202, 203, 204, 205. Or the lens barrel 103 or the lens barrel 201 may be bent.
[0005]
On the other hand, in the above item (2), the guide shaft holding parts 121a, 121a, 121b, 121b are formed to be elastically deformable in order to solve the problem of the item (1). However, in the above (2), the problem that only the elastically deformable material can be used for the lid member 12 remains, and a robust lens barrel cannot be realized.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a robust lens barrel that does not cause bending during assembly.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, a first aspect includes a lens, a support portion that supports the lens, a guide shaft on which the support portion is slidably attached, a first lens barrel that supports the guide shaft, and A first lens barrel having a recess for receiving the guide shaft, and the second lens barrel having a pressing portion for pressing the guide shaft , the guide shaft and the portion abutting parts are thin-walled portion of thin, barrel main body, when the second barrel to insert the guide shaft in the recess mounted on the first barrel, the thin portion The guide shaft is pressed against the concave portion by plastic deformation to support the guide shaft .
The portion of the pressing portion that comes into contact with the guide shaft is a thin-walled portion, and the barrel main body is a thin-walled portion when the guide shaft is inserted into the recess and the second barrel is attached to the first barrel. Since the guide shaft is pressed against the recess by plastic deformation of the guide shaft, the guide shaft is supported, so that there is no possibility that the first lens barrel and the second lens barrel will be bent, and the lens barrel body is assembled with high accuracy. be able to.
[0008]
A guide shaft is inserted into the recess of the first lens barrel, and the second lens barrel is attached to the first lens barrel. At this time, the guide shaft is supported by the concave portion and the presser portion while being plastically deformed by the presser portion coming into contact with the guide shaft. Therefore, it is possible to realize a robust lens barrel that does not cause the first and second lens barrels to be bent during assembly.
According to a second aspect of the present invention, a lens, a support portion that supports the lens, a guide shaft on which the support portion is slidably attached, and a first lens barrel and a second lens barrel that support the guide shaft are provided. And the first lens barrel has a recess for receiving the guide shaft, and the second lens barrel has a pressing portion for pressing the guide shaft and abuts on the guide shaft of the pressing portion. The contact surface is an uneven surface. When the guide shaft is inserted into the recess and the second lens barrel is attached to the first lens barrel, the lens barrel body is deformed by the plastic deformation of the contact surface. A lens barrel configured to be pressed against a recess to support a guide shaft.
The abutment surface that abuts the guide shaft of the holding portion is an uneven surface, and the lens barrel body abuts when the guide shaft is inserted into the recess and the second lens barrel is attached to the first lens barrel. Since the guide shaft is pressed against the recess by plastic deformation of the surface to support the guide shaft, there is no risk of bending the first and second lens barrels, and the lens barrel body is assembled with high accuracy. Can.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of a zoom lens barrel according to the present invention, showing main components.
A zoom lens barrel 1 as a lens barrel includes a main barrel 4 in which a sub-barrel 3 is detachably attached to a main barrel 2, a pair of guide shafts 5, 5 attached to the main barrel 2, and a main barrel 2. A front lens group 6 attached to the lens barrel 2, a variator lens group 7 as a lens slidably attached to the guide shafts 5 and 5 via a support member (not shown), and a support (not shown) on the guide shafts 5 and 5. A fixed master lens 8 as a lens attached via a member, a moving master lens group 9 as a lens slidably attached to guide shafts 5 and 5 via a support member (not shown), and attached to the main barrel 2 Crystal filter 11, CCD (Charge Coupled Device) 13 attached to main lens barrel 2 via elastic member 12, motor 14 for sliding and moving variator lens group 7, and moving master lens group The motor 15 for sliding movement, consisting of elaborate diaphragm mechanism 20. The difference along the fixed master over lens 8. In addition, C shown with a dashed-two dotted line shows a video camera main body.
[0010]
In other words, the zoom lens barrel 1 forms an object image on an image sensor such as a CCD 13 by the front lens group 6, the variator lens group 7, the fixed master lens 8, and the moving master lens group 9, and the image sensor An image is configured to be photoelectrically converted.
[0011]
Specifically, the main barrel 2 forms a support portion 2b of the front lens group 6 inside the housing 2a, forms a mounting portion 2c of the crystal filter 11 inside the housing 2a, and forms an insertion portion 2d of the aperture mechanism 20. In the housing 2a, recesses 17 for supporting the guide shafts 5 and 5 (... indicates a plurality, the same applies hereinafter) are formed.
[0012]
The auxiliary lens barrel 3 has a mounting surface 3b for the motor 14 formed outside the housing 3a, a mounting surface 3c for the motor 15 formed outside the housing 3a, and an insertion port 3d for the aperture mechanism 20 formed in the housing 3a. The presser portions 18 of the guide shafts 5 and 5 are formed inside.
[0013]
2 is a cross-sectional view taken along the line 2-2 in FIG.
The guide shafts 5 and 5 are arranged obliquely with respect to the horizontal axis X of the main barrel 2. Thereby, the outer diameter of the barrel main body 4 can be made compact.
In addition, since the guide shafts 5 and 5 are disposed obliquely, the diaphragm mechanism 20 is attached with an inclination of the angle θ with respect to the longitudinal axis Y of the zoom lens barrel body 4.
[0014]
FIGS. 3A and 3B are cross-sectional views of the main part showing the presser part of the first embodiment according to the present invention. FIG. 3A is a cross-sectional view of the main part of the presser part 18, and FIG. Bb) is a view taken along line bb.
The guide shaft 5 is inserted into the concave portion 17 of the main lens barrel 2 and supported by the presser portion 18 of the sub lens barrel 3.
The presser portion 18 is formed by forming a support rib 19 on the sub-barrel 3 and forming the tip of the support rib 19 thin.
Since the presser portion 18 is formed by thinning the tip of the support rib 19, the presser portion 18 hits the guide shaft 5 and is plastically deformed when the sub barrel 3 is attached to the main barrel 2. Accordingly, there is no possibility of causing the main lens barrel 2 and the sub lens barrel 3 shown in FIG. 1 to bend, and the zoom lens barrel 1 can be assembled with high accuracy.
[0015]
The operation of the zoom lens barrel 1 described above will be described with reference to the next figure.
FIGS. 4A to 4C are explanatory views of the operation of the zoom lens barrel according to the present invention.
In (a), one in which the guide shaft 5 is fitted in the recess 17 of the main lens barrel 2 is prepared, while the sub lens barrel 3 is prepared.
Next, the sub-tube 3 is put on the main tube 2 as shown by the arrow (1).
In (b), the sub-barrel 3 is attached to the main barrel 2 with a mounting screw (not shown), and the sub-barrel 3 is pressed against the main barrel 2 as shown by the arrow (2), whereby the presser portion 18 is moved to the guide shaft. 5 is deformed following the outer shape of 5. Note that the distance by which the sub-barrel 3 is moved is h.
[0016]
(C) is a figure of the pressing portion 18 after assembly, the pressing portion 18 shows the state of being deformed according to the contour of the guide shaft 5.
The amount by which the presser portion 18 is plastically deformed can be arbitrarily determined by selecting the distance h for moving the sub-lens 3 shown in (b) and the thickness t of the presser portion 18 (see FIG. 3). There is no need to limit it to deformable materials. Therefore, it is possible to embody the robust zoom lens barrel 1 (see FIG. 1) that does not cause bending during assembly.
[0017]
Figure 5 (a), (b) is Ru fragmentary cross-sectional view showing the pressing portion of the second embodiment according to the present invention. (A ) shows the principal part cross section of the pressing part 38, (b) shows the bb line arrow directional view of (a).
The guide shaft 5 is inserted into the concave portion 17 of the main lens barrel 2 and supported by the pressing portion 38 of the sub lens barrel 3.
The presser portion 38 is formed by forming a support rib 39 on the sub-lens 3 and forming an uneven surface 38 a at the tip of the support rib 39.
Since the concavo-convex surface 38 a is formed at the tip of the presser portion 38, the presser portion 38 hits the guide shaft 5 and is plastically deformed when the sub barrel 3 is attached to the main barrel 2. Accordingly, there is no possibility of causing the main lens barrel 2 and the sub lens barrel 3 shown in FIG. 1 to bend, and the zoom lens barrel 1 (see FIG. 1) can be assembled with high accuracy.
[0018]
In the embodiment, the shape of the plastic shaft is deformed by hitting the guide shaft. In the first embodiment, the presser portion is formed thin, and in the second embodiment, the tip of the presser portion is provided with an uneven surface. May be.
[0019]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, the portion of the pressing portion that comes into contact with the guide shaft is a thin-walled portion, and the lens barrel body has the guide shaft inserted into the recess and the second lens barrel attached to the first lens barrel. At this time, since the guide shaft is pressed against the concave portion by plastic deformation of the thin-walled portion, the guide shaft is supported, so that there is no possibility of causing the first and second lens barrels to bend, and the lens barrel body Can be assembled with high accuracy.
A guide shaft is inserted into the recess of the first lens barrel, and the second lens barrel is attached to the first lens barrel. At this time, the guide shaft is supported by the concave portion and the presser portion while being plastically deformed by the presser portion coming into contact with the guide shaft. Therefore, it is possible to realize a robust lens barrel that does not cause the first and second lens barrels to be bent during assembly.
According to a second aspect of the present invention, the contact surface that contacts the guide shaft of the pressing portion is an uneven surface, and the lens barrel body has the guide shaft inserted into the recess and the second lens barrel attached to the first lens barrel. At this time, since the guide shaft is pressed against the recess by the plastic deformation of the contact surface to support the guide shaft, there is no possibility of causing the first lens barrel or the second lens barrel to bend. The main body can be assembled with high accuracy.
[Brief description of the drawings]
1 is a cross-sectional view of a zoom lens barrel according to the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a cross-sectional view of an essential part showing a presser portion of a first embodiment according to the present invention. FIG. 4 is an operation explanatory view of a zoom lens barrel according to the present invention. FIG. 5 is a cross-sectional view of a main part showing a presser portion of a second embodiment according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Lens barrel (zoom lens barrel), 2 ... Main barrel, 17 ... Concave part, 3 ... Sub barrel, 18, 38 ... Holding part, 5 ... Guide shaft, 7 ... Lens (variator lens), 8 ... Lens (fixed master lens), 9 ... lens (moving master lens).

Claims (2)

A lens,
A support for supporting this lens;
A guide shaft on which the support portion is slidably mounted;
The guide shaft supporting the first lens barrel and the lens barrel body made by the second lens barrel, comprising a,
The first lens barrel has a recess for receiving the guide shaft,
The second lens barrel has a pressing portion that presses the guide shaft, and a portion that contacts the guide shaft of the pressing portion is a thin-walled portion.
The lens barrel body, the guide shaft by inserting the second barrel when attached to the first barrel, against the guide shaft by the plastic deformation of the thin portion in the recess in the recess A lens barrel configured to support the guide shaft . A lens,
A support for supporting the lens;
A guide shaft on which the support portion is slidably mounted;
A lens barrel body that supports the guide shaft and includes a first lens barrel and a second lens barrel; and
The first lens barrel has a recess for receiving the guide shaft,
The second lens barrel includes a pressing portion that presses the guide shaft, and a contact surface that contacts the guide shaft of the pressing portion is an uneven surface.
When the guide shaft is inserted into the recess and the second lens barrel is attached to the first lens barrel, the lens barrel body presses the guide shaft against the recess by plastic deformation of the contact surface. The lens barrel is configured to support the guide shaft.

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