JP2008158333A - Optical system holding frame and optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical system holding frame which is capable of preventing the occurrence of a scratch in an optical system and to provide optical equipment. <P>SOLUTION: The optical system holding frame (5) includes: a holding part (5a) which holds the optical systems (4-1 and 4-2); a fixing part (5b) which is formed from the holding part (5a) to one of the incident or outgoing side of the optical systems (4-1 and 4-2) from the end (4a) of the other of the incident or outgoing side and fixes the optical systems (4-1 and 4-2); and a projecting part (5d) which is formed from the holding part (5a) to one of the incident or outgoing side from the end (4a). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical system holding frame and an optical apparatus.

As a conventional lens barrel, there is known a lens barrel that prevents the lens from collapsing and prevents other adjacent lenses from being adversely affected such as by tilting. For example, Patent Document 1 is known.
In the conventional lens barrel, if the lens shape is convex, for example, if the lens is placed with the lens side down during work, there is a possibility that the tip of the lens will be scratched as it is.
JP 11-337794 A

  An object of the present invention is to provide an optical system holding frame and an optical apparatus that can prevent the optical system from being damaged.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although it attaches | subjects and demonstrates the code | symbol corresponding to drawing which shows one Embodiment of this invention, it is not limited to this.
According to the first aspect of the present invention, there is provided a holding portion (5a) for holding an optical system (4-1, 4-2), and an incidence of the optical system (4-1, 4-2) from the holding portion (5a). A fixing portion (5b) that is formed from one end (4a) on the side or the exit side to the other on the entrance side or the exit side and that fixes the optical system (4-1, 4-2), and the holding An optical system holding frame (5) including a protrusion (5d) formed from a portion (5a) to one of the incident side and the exit side from the end (4a).
The invention of claim 2 includes a holding part (5a) for holding the optical system (4-1, 4-2) and an end part (4a) on the incident side of the optical system (4-1, 4-2). Is also formed from the exit side to the holding portion (5a), the fixing portion (5b) for fixing the optical system (4-1, 4-2), and the optical system (4-1, 4-2) An optical system holding frame (5) including a protruding portion (5d) formed from the incident side to the holding portion (5a) with respect to the end portion (4a).
The invention according to claim 3 is a holding portion (5a) for holding the optical system (4-1, 4-2), and an incident side from an exit side end portion of the optical system (4-1, 4-2). To the holding part (5a), and a fixing part (5c) for fixing the optical system (4-1, 4-2), and the end part of the optical system (4-1, 4-2) And an optical system holding frame including a projection formed from the exit side to the holding portion (5a).
A fourth aspect of the present invention is the optical system holding frame (5) according to any one of the first to third aspects, wherein the fixing portion (5b) is caulked to form the optical system (4). -1) is fixed, the optical system holding frame (5).
The invention of claim 5 is the optical system holding frame (5) according to any one of claims 1 to 4, wherein the protrusion (5d) is formed of the optical system (4-1). The optical system holding frame (5) is characterized in that it is formed in the vicinity of the outer periphery.
The invention of claim 6 is the optical system holding frame (5) according to any one of claims 1 to 5, wherein the optical system (4-1, 4-2) is used. The optical system holding frame (5) is provided with a fixing portion (5c) which is disposed at a position opposite to the fixing portion (5b) and is different from the fixing portion (5b).
The invention of claim 7 is an optical apparatus (1, 3) comprising the optical system holding frame (5) according to any one of claims 1 to 6.
Note that the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another component.

  According to the present invention, it is possible to provide an optical system holding frame and an optical apparatus that can prevent the optical system from being damaged.

  Hereinafter, the present invention will be described in more detail with reference to the drawings and the like. The optical apparatus of the present invention can be, for example, a still camera, a video camera, a lens barrel, or the like. In the following embodiments, a single lens reflex camera will be described as an example.

[Embodiment]
FIG. 1 is a schematic diagram illustrating a camera according to an embodiment.
The camera 1 includes a camera body 2 and a lens barrel 3.
The camera body 2 includes an image sensor 2a that converts an optical image of a subject into an electrical signal.
The lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2. In the present embodiment, the lens barrel 3 is an interchangeable lens. However, the present invention is not limited to this, and the lens barrel 3 may be a lens barrel integrated with the camera body.
The lens barrel 3 includes first and second lenses 4-1 and 4-2 and a lens chamber 5 that holds the first and second lenses 4-1 and 4-2. Details of the lens chamber 5 will be described later.

FIG. 2 is a perspective view illustrating details of the lens chamber 5 of the embodiment, and FIG. 3 is a cross-sectional view taken along line XX of FIG.
As shown in FIG. 3, the lens chamber 5 includes a lens tube 5a, a first caulking portion 5b, a second caulking portion 5c, and a projection 5d, and is large and engages with a frame or the like (not shown). It has a diameter part C and a small diameter part D formed on the subject side of the large diameter part C (arrow A direction side in the figure).
Further, in the lens chamber 5, the first lens 4-1 is on the subject side (the arrow A direction side in the drawing), and the second lens 4-2 is on the photographer (image plane) side (the arrow B direction in the drawing). 1 is arranged in the lens barrel 3 so as to be on the camera body 2 side in FIG.
Of course, in addition to the first and second lenses 4-1 and 4-2, other components may be mounted in the lens chamber 5, but this embodiment is not affected. Omitted.

The lens cylinder 5a is a cylindrical portion that holds the first and second lenses 4-1 and 4-2 that are convex on both sides.
Further, on the inner diameter side of the lens barrel 5a, a first lens receiving portion 5a-1 serving as a receiving portion of the first lens 4-1, and a second lens serving as a receiving portion of the second lens 4-2. A receiving portion 5a-2 is formed.
The first caulking portion 5b is located on the most one side of the first and second lenses 4-1 and 4-2 in the optical axis O direction of the first and second lenses 4-1 and 4-2 (in the drawing). The first lens 4-1 on the arrow A direction side) is formed from the other side (arrow B direction side in the figure) to the lens cylinder 5a than the tip portion (vertex part) 4a, and is caulked by heat welding or the like. This is a portion for fixing the first lens 4-1 to the lens cylinder 5a.
The second caulking portion 5c is the tip of the lens barrel 5a on the photographer side (the arrow B direction side in the drawing), and is the first with respect to the first and second lenses 4-1, 4-2. This is a portion that is provided at a position opposite to the caulking portion 5b in the direction of the optical axis O and that fixes the second lens 4-2 to the lens barrel 5a by caulking similar to the first caulking portion 5b.

The protrusion 5d is formed in the vicinity of the outer periphery of the first lens 4-1, and from the one side (the arrow A direction side in the figure) to the lens cylinder 5a from the front end 4a of the first lens 4-1. Part.
Specifically, the tip of the protrusion 5d protrudes from the tip 4a of the first lens 4-1 by the required length α with respect to the tip 4a of the first lens 4-1. Yes. The length α is preferably set to about 5 mm or less, for example, so as not to disturb other members while maintaining strength.
Further, as shown in FIG. 2, the protruding portion 5d is provided on substantially the same circumference as the first caulking portion 5b.
Further, the protruding portions 5d are provided at approximately three locations on the circumference, and each has the same height.

Next, the manufacturing method of the lens chamber 5 of this embodiment is demonstrated.
First, the original shape of the lens chamber 5 is molded using an injection molding machine.
Next, the lens chamber 5 is placed on the work table with the large-diameter portion C (see FIG. 3) of the lens chamber 5 facing down, and the first lens 4-1 is fitted into the lens tube 5a to perform the first caulking. The part which becomes the part 5b is caulked.
Furthermore, the lens chamber 5 is turned over on the work table, the lens chamber 5 is installed on the work table with the small diameter portion D of the lens chamber 5 facing down, and the second lens 4-2 is fitted into the lens tube 5a. The portion that becomes the second caulking portion 5c is caulked. At this time, since the protrusion 5d contacts the work table, the first lens 4-1 does not contact the work table.
Through these steps, the lens chamber 5 as shown in FIGS. 2 and 3 is completed. By incorporating the lens chamber 5 into the lens barrel 3, the camera 1 as shown in FIG. 1 is completed.

Thus, according to this embodiment, there are the following effects.
(1) Since the projection 5d is provided, the first lens 4-1 can be fixed by caulking and then the first lens 4-1 can be placed downward and the lens chamber 5 can be placed on the work table. The lens 4-1 is not scratched. Further, it is possible to prevent the first lens 4-1 from being scratched during transportation. Furthermore, a dedicated tool for preventing scratches is not necessary, and it is not necessary to provide protrusions in other portions of the lens chamber 5.
(2) Since the projections 5d are provided at three positions, the lens chamber 5 is stably placed on the work table even when the lens chamber 5 is placed on the work table with the first lens 4-1 facing down. can do. In addition, since the lens chamber 5 can be stably installed on the work table, the caulking operation of the second caulking portion 5c on the opposite side can be reliably performed.

(3) Since the first and second lenses 4-1 and 4-2 are fixed by caulking, the first and second lenses 4-1 and 4-2 can be manufactured at a lower cost than the method of fixing using separate members.
(4) Since the three protruding portions 5d have the same height, the installation of the lens chamber 5 is more stable.

(5) If a projection for protection is provided on the front surface 5e (see FIG. 2) of the lens chamber 5, which is a portion other than substantially the same circumference as the first caulking portion 5b, the shape of the other mounting member However, in this embodiment, since the protrusion 5d is provided on the substantially same circumference as the first caulking portion 5b, the shape of the member attached to the front surface 5e of the lens chamber 5 is not limited, Design freedom is improved. Therefore, it is possible to provide the lens chamber 5 that can protect the lens without greatly affecting the shape of the lens chamber 5.
(6) By providing the lens chamber 5 that can prevent each lens from being scratched, the camera 1 and the lens barrel 3 with good optical performance can be provided.

[Deformation]
The embodiment described above can be modified as follows.
(1) Although the example in which the protruding portions 5d are provided at three places has been described, for example, four or more places may be provided. Moreover, even if the protrusion 5d is provided only at one place or two places, for example, the function of preventing the lens from being scratched can be exhibited. The number of the protrusions 5d may be balanced depending on the caulking convenience and the installation purpose.
(2) Although each lens has been described as an example of fixing by caulking, it may be fixed by other fixing methods such as adhesion.

(3) Each lens may be an optical system such as a lens group and a reflecting mirror, for example. Further, the optical system is not limited to a lens, and may be parallel plane glass or the like.
(4) The caulking has been described in the example of caulking by thermal welding, but normal caulking that is mechanically deformed may be used.

(5) FIG. 4 is a cross-sectional view showing a modified lens chamber 5-1. In addition, the description which overlaps the part which performs the same function as embodiment mentioned above is abbreviate | omitted suitably.
For example, the protrusion 5d may be used as a part to which another component 6 such as an ultrasonic motor or a flare squeezing is attached. In this way, the protrusion 5d can be used for other purposes.
(6) FIG. 5 is a cross-sectional view showing another modified lens chamber 5-2.
For example, the protrusion 5d may be used as a region 5f that is pushed by an ejector pin of an injection molding machine. Even if it does in this way, the projection part 5d can be utilized for another use.
In addition, although embodiment and the deformation | transformation mentioned above can also be used in combination suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited by the above-described embodiments and modifications.

It is a schematic diagram which shows the camera of embodiment. It is a perspective view which shows the detail of the lens chamber 5 of embodiment. It is sectional drawing along the XX line of FIG. It is sectional drawing which shows the lens chamber 5-1 of a deformation | transformation form. It is sectional drawing which shows the lens chamber 5-2 of another modification.

Explanation of symbols

  1: camera, 2: camera body, 3: lens barrel, 4: lens, 4-1: first lens, 4-2: second lens, 4a: tip, 5, 5-1, 5- 2: lens chamber, 5a: lens tube, 5b: first caulking portion, 5c: second caulking portion, 5d: protrusion, O: optical axis

Claims (7)

A holding unit for holding the optical system;
From the holding part, a fixing part that is formed from one end part on the incident side or exit side of the optical system to the other on the incident side or exit side, and fixes the optical system;
An optical system holding frame comprising: a protrusion formed from the holding part to one of the incident side and the emission side rather than the end part. A holding unit for holding the optical system;
A fixing part that is formed from the exit side to the holding part rather than the end part on the incident side of the optical system, and fixes the optical system;
An optical system holding frame comprising: a projection formed from the incident side to the holding unit with respect to the end of the optical system. A holding unit for holding the optical system;
A fixing portion that is formed from the incident side to the holding portion rather than the end portion on the exit side of the optical system, and fixes the optical system;
An optical system holding frame comprising: a projection formed from an exit side to the holding unit with respect to the end of the optical system. An optical system holding frame according to any one of claims 1 to 3,
The fixing part is fixing the optical system by caulking;
An optical system holding frame. An optical system holding frame according to any one of claims 1 to 4,
The protrusion is formed near the outer periphery of the optical system;
An optical system holding frame. An optical system holding frame according to any one of claims 1 to 5,
With respect to the optical system, it is disposed at a position opposite to the fixing portion, and includes a fixing portion different from the fixing portion.
An optical system holding frame.   An optical apparatus comprising the optical system holding frame according to any one of claims 1 to 6.

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