JP4900188B2 - Lens barrel and optical apparatus including the same - Google Patents

Description

  The present invention relates to a lens barrel and an optical apparatus including the lens barrel.

Conventionally, as a method of optical adjustment of a lens in a lens barrel, for example, a method of inserting a washer between a holding frame that holds a lens and a fixed cylinder to which the holding frame is fixed has been proposed (for example, , See Patent Document 1).
Japanese Utility Model Publication No. 6-23013

  However, in the above prior art, it is necessary to loosen the fixing screw that fixes the holding frame and the fixed cylinder and insert the washer between the holding frame and the fixed cylinder. For this reason, the optical adjustment work is complicated and fine adjustment is not easy.

  An object of the present invention is to provide a lens barrel that can be easily optically adjusted and an optical apparatus including the lens barrel.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

The invention according to claim 1 includes a lens holding member (9) that holds at least a part of the fixed cylinder (3) and holds the lens (L1), and a pressing portion (95a). A fixing member (95) for attaching the lens holding member (9) to the fixed cylinder (3) by pressing the lens holding member (9) toward the fixed cylinder (3) by a portion (95a); An elastic member (96) disposed between the pressing portion (95a) and the lens holding member (9) of (95), and between the lens holding member (9) and the fixed cylinder (3) An adjustment member (97) capable of forming a gap whose interval can be adjusted, and the lens holding member protrudes outward from the insertion portion to be inserted into the inner periphery of the fixed cylinder. And a mounting portion facing the part of the fixed cylinder. The fixing member is mounted via the elastic member from one of the mounting portion is a mounting screw for mounting the lens holding member to the fixed cylindrical, the adjusting member is attached from said one of said mounting portion An adjustment screw, the elastic member is a washer provided around a thread groove of the mounting screw, and the elastic member (96) is in accordance with an interval adjusted by the adjustment member (97). It is a lens barrel (2) characterized by being deformable.
The invention according to claim 2 is provided to face at least a part of the fixed cylinder (3), and holds the lens holding member (9) that holds the lens (L1), and the lens holding member (9). The elastic member (96) that can be deformed by pressing and the elastic member (96) is provided opposite to the elastic member (96), and the elastic member (96) and the lens holding member (9) are connected to the fixed cylinder (3). A fixing member (95) that is pressed against and fixed to the lens holding member (9), and an adjustment member that adjusts the distance between the lens holding member (9) and the fixed cylinder (3). 97), and the lens holding member includes an insertion portion that is inserted into the inner periphery of the fixed cylinder, and an attachment portion that protrudes outward from the insertion portion and faces the part of the fixed cylinder. The fixing member includes the elastic member from one side of the mounting portion. And the adjustment member is an adjustment screw attached from the one of the attachment portions, and the elastic member is a washer provided around a screw groove of the attachment screw. The lens barrel (2) is characterized in that the elastic member (96) can be deformed according to the interval adjusted by the adjusting member (97).
Invention of Claim 3 is a lens-barrel (2) of Claim 1 or 2, Comprising: By adjusting the said space | interval by the said adjustment member (97), the said lens holding member (9) The lens barrel (2) is adjustable in angle with respect to the fixed barrel (3).
Invention of Claim 4 is a lens-barrel (2) of any one of Claims 1-3, Comprising: The said adjustment member is a screw screwed together by the said lens holding member (9) (97), and the end surface (3a) of the fixed tube (3) is pressed by the end portion (97a), thereby adjusting the distance between the lens holding member (9) and the fixed tube (3). The lens barrel (2) is characterized by forming a possible gap.
A fifth aspect of the present invention is the lens barrel (2) according to the first to fourth aspects, wherein the fixing member is interposed from one of the lens holding members (9) via the elastic member (96). The lens barrel (2) is a screw (95) that passes through a hole (93) provided in the lens holding member (9) and is screwed into the fixed cylinder (3). .
The invention described in claim 6 is the lens barrel (2) according to any one of claims 1 to 5, wherein the fixing member (95) and the adjusting member (97) are each 3 The lens barrel (2) is provided as described above.
The invention according to claim 7 is the lens barrel (2) according to any one of claims 1 to 6 , wherein the fixing member and the adjustment member are adjacent to each other in the circumferential direction in the mounting portion. The lens barrel (2) is characterized by being provided .
The invention of claim 8 is the lens barrel according to any one of claims 1 to 7, wherein the pitch of the screw groove of the adjusting screw is narrower than the pitch of the screw groove of the mounting screw. This is a lens barrel.
Invention of Claim 9 is an optical apparatus (1) provided with the lens-barrel (2) of any one of Claims 1-8 .
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, optical adjustment can be easily performed.

  Embodiments of the present invention will be described below with reference to the drawings. Each figure shown below is provided with an XYZ orthogonal coordinate system for ease of explanation and understanding. In this coordinate system, when the photographer shoots a horizontally long image with the optical axis A being horizontal, the direction toward the left side when viewed from the photographer at the position of the camera 1 (hereinafter referred to as a normal photographing position) is the X plus direction. To do. In addition, a direction toward the upper side at a normal photographing position is a Y plus direction. Furthermore, the direction toward the subject at the normal shooting position is the Z plus direction.

  FIG. 1 is a cross-sectional view of an interchangeable lens barrel 2 that can be attached to and detached from a camera 1 according to the present embodiment. The lens barrel 2 includes a single-focus imaging optical system having a four-group lens configuration including a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4 from the Z plus side. A fixed cylinder 3 and a cam cylinder 4 are arranged around the photographing optical system, and a diaphragm unit 5 for adjusting the amount of light passing through the photographing optical system is disposed between the second lens group L2 and the third lens group L3. Is provided. The lens barrel 2 has a configuration in which the second lens group L2 and the third lens group L3 are used as a focus lens group, and focus adjustment is performed by moving the second lens group L2 and the third lens group L3 in the optical axis direction. It has become.

  The fixed cylinder 3 is provided around the photographing optical system and does not move with respect to the camera 1 even when the cam cylinder 4 rotates. The fixed cylinder 3 includes a rectilinear groove 31 and a rectilinear groove 32 extending along the optical axis. Further, three screw holes 33 (only one cross section is shown in FIG. 1) are provided on the Z plus side end face 3a of the fixed cylinder 3 at intervals of 120 degrees.

  The cam cylinder 4 is rotatably provided on the inner peripheral side with respect to the fixed cylinder 3, and is provided with three cam grooves 41 and 42, respectively. A cam follower 71 attached to the second lens group holding frame 7 that holds the second lens group L2 is engaged with the cam groove 41. The cam follower 71 is also engaged with a rectilinear groove 31 provided in the fixed cylinder 3, and the second lens group L2 moves along the optical axis when the cam cylinder 4 rotates.

  A cam follower 81 attached to the third lens group holding frame 8 that holds the third lens group L3 is engaged with the cam groove 42. The cam follower 81 is also engaged with the rectilinear groove 32 provided in the fixed cylinder 3, and the third lens group L3 moves along the optical axis when the cam cylinder 4 rotates.

  The first lens group L 1 is held by the first lens group holding frame 9, and the first lens group holding frame 9 is attached to the fixed cylinder 3. 2 is a front view of the first lens group L1, the first lens group holding frame 9, and the fixed barrel 3 as viewed from the Z plus direction, FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, and FIG. It is sectional drawing along the IV-IV line of FIG.

  As shown in FIGS. 3 and 4, the first lens group holding frame 9 includes an insertion portion 91 inserted into the fixed barrel 3 and an end portion on the Z plus side of the insertion portion 91 as shown in FIG. And mounting portions 92 projecting outward from three locations in the circumferential direction. One concave lens L1a of the first lens group L1 is held inside the insertion portion 91, and two convex lenses L1b of the first lens group L1 are held on the Z minus side of the insertion portion 91. A holding member 10 is fixed with screws 11.

  The attachment portions 92 are arranged at intervals of 120 degrees along the circumference of the insertion portion 91. The attachment portion 92 is provided with two holes that are adjacent to each other in the circumferential direction. One hole is an attachment hole 93 for attaching the first lens group holding frame 9 to the fixed cylinder 3, and is not screwed. As will be described later, the other hole is an adjustment hole 94 for an adjustment screw that adjusts the inclination of the first lens unit L1, and is threaded.

  As shown in FIG. 4, the mounting screw 95 inserted into the mounting hole 93 is inserted into the mounting hole 93 with the spring washer 96 interposed therebetween, and the tip thereof is screwed into the screw hole 33 of the fixed cylinder 3. . The screw head 95a of the mounting screw 95 presses and deforms the spring washer 96 and presses it against the mounting portion 92 side. Further, as shown in FIG. 3, the adjustment screw 97 inserted into the adjustment hole 94 is a flat head screw having a flat surface 97a at the tip, and is screwed into the adjustment hole 94. The flat surface 97a is fixed to the fixed cylinder 3 as shown in FIG. Is in contact with the end surface 3a.

  Next, an optical adjustment method of the first lens unit L1 in the lens barrel 2 of the present embodiment will be described. First, with the insertion portion 91 of the first lens group holding frame 9 in the state where the first lens group L1 is held, the positions of the mounting hole 93 of the first lens group holding frame 9 and the screw hole 33 of the fixed cylinder 3 are the same. In this way, the inner side of the fixed cylinder 3 is inserted, and the Z minus side surface of the mounting portion 92 is brought into contact with the end surface 3 a of the fixed cylinder 3.

  The mounting screws 95 are inserted into the mounting holes 93 of the three mounting portions 92 with spring washers 96 interposed therebetween. The first lens group holding frame 9 is temporarily fixed to the fixed cylinder 3 by screwing the tip of the mounting screw 95 into the screw hole 33 of the fixed cylinder 3.

  Next, the adjusting screws 97 are screwed into the three adjusting holes 94, respectively. At this time, first, as shown in FIG. 3, the flat surface 97 a at the tip of the adjustment screw 97 is simply in contact with the end surface 3 a of the fixed cylinder 3 without pressing. In this state, when the optical axis of the first lens unit L1 is shifted, optical adjustment of the first lens unit L1 is performed. When the adjustment screw 97 is further screwed in from the state shown in FIG. 3, the flat surface 97 a at the tip of the adjustment screw 97 presses the end surface of the fixed cylinder 3. FIG. 5 is a cross-sectional view showing a state in which the flat surface 97 a at the tip of the adjustment screw 97 presses the end surface 3 a of the fixed cylinder 3. As shown in the drawing, when the flat surface 97a at the tip of the adjustment screw 97 presses the end surface 3a of the fixed cylinder 3, the mounting portion 92 of the first lens group holding frame moves in the direction of the arrow, and the fixed cylinder 3 and the first A gap d is formed between the lens group holding frame 9 and the lens group holding frame 9.

  6 is an enlarged view of a portion of the mounting screw 95 when the flat surface 97a of the adjusting screw 97 presses the end surface of the fixed cylinder 3 as shown in FIG. When a gap d is formed between the fixed barrel 3 and the first lens group holding frame 9 at the position of the adjustment hole 94 in the mounting portion 92 of the first lens group holding frame 9, at the position of the adjacent mounting hole 93. Also, the mounting portion 92 of the first lens group holding frame 9 moves in the Z plus direction with respect to the mounting screw 95, and a gap d ′ is generated in the mounting portion 92 of the first lens group holding frame 9. On the other hand, since the position of the mounting screw 95 with respect to the fixed cylinder 3 does not change, the spring washer 96 is elastically deformed and compressed. As described above, even if the washer 96 is fixed, the washer 96 can be deformed to generate the gap d ′. Therefore, the first lens group holding frame 9, that is, the first lens group L 1 is used as the optical axis. Can be tilted.

  As described above, according to the present embodiment, the first lens group holding frame 9 is tilted by adjusting the screwing amount of the adjustment screw 97 screwed into the adjustment holes 94 of the three attachment portions 92, so that the first lens group holding frame 9 is tilted. Optical adjustment of the lens unit L1 can be performed. Therefore, the optical adjustment of the first lens unit L1 can be easily performed, and at this time, it is not necessary to loosen the mounting screw 95.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) In this embodiment, the mounting hole 93 and the adjustment hole 94 are arranged in the circumferential direction in the mounting portion 92. However, the present invention is not limited to this, and the mounting hole 93 and the adjustment hole 94 are adjusted. The holes 94 may be arranged in the mounting portion 92 in the radial direction.
(2) In the present embodiment, the lens barrel that can be attached to and detached from the camera has been described. However, the present invention is not limited to this and may be a lens barrel that is integral with the camera. The lens barrel of the present invention can be used not only for cameras but also for other optical devices such as telescopes.
(3) Although the spring washer is disposed between the attachment portion 92 and the screw head of the attachment screw 95, the present invention is not limited to this, and other elastic members such as rubber may be used.
(4) The pitch of the thread groove cut in the screw 97 is preferably narrower than the pitch of the screw groove cut in the screw 95. This is because the screwing position of the screw 97 can be set with high accuracy by narrowing the pitch of the screw groove.
In addition, although embodiment and a deformation | transformation form can also be used combining suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

It is sectional drawing of the lens-barrel concerning this embodiment. It is the front view which looked at the 1st lens group, the 1st lens group holding frame, and the fixed cylinder from the Z plus direction. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing of the state in which the clearance gap produced between the fixed cylinder and the 1st lens group holding frame. It is an enlarged view of the part of the screw for attachment in the state of FIG.

Explanation of symbols

  1: Camera, 2: Lens barrel, 3: Fixed barrel, 4: Cam barrel, 9: First lens holding frame, 95: Mounting screw, 95a: Screw head, 96: Washer, 97: Adjustment screw, 97a : Flat surface

Claims (9)

A lens holding member that is provided to face at least a part of the fixed cylinder and holds the lens;
A fixing member having a pressing part and pressing the lens holding member toward the fixed cylinder by the pressing part and attaching the lens holding member to the fixed cylinder;
An elastic member disposed between the pressing portion of the fixing member and the lens holding member;
An adjustment member capable of forming a gap capable of adjusting the gap between the lens holding member and the fixed cylinder;
The lens holding member includes an insertion part that is inserted into an inner periphery of the fixed cylinder, and an attachment part that protrudes outward from the insertion part and faces the part of the fixed cylinder,
The fixing member is an attachment screw attached from one of the attachment portions via the elastic member, and attaching the lens holding member to the fixed cylinder.
The adjustment member is an adjustment screw attached from the one of the attachment parts,
The elastic member is a washer provided around a thread groove of the mounting screw,
The lens barrel according to claim 1, wherein the elastic member is deformable in accordance with an interval adjusted by the adjusting member. A lens holding member that is provided to face at least a part of the fixed cylinder and holds the lens;
An elastic member provided facing the lens holding member and deformable by pressing;
A fixing member provided facing the elastic member, and pressing the elastic member and the lens holding member against the fixed cylinder;
An adjustment member that is provided opposite to the lens holding member, and that adjusts an interval between the lens holding member and the fixed cylinder;
The lens holding member includes an insertion part that is inserted into an inner periphery of the fixed cylinder, and an attachment part that protrudes outward from the insertion part and faces the part of the fixed cylinder,
The fixing member is a mounting screw that is mounted from one of the mounting portions via the elastic member,
The adjustment member is an adjustment screw attached from the one of the attachment parts,
The elastic member is a washer provided around a thread groove of the mounting screw,
The lens barrel according to claim 1, wherein the elastic member is deformable in accordance with an interval adjusted by the adjusting member. The lens barrel according to claim 1 or 2,
A lens barrel capable of adjusting an angle of the lens holding member with respect to the fixed tube by adjusting the distance by the adjusting member. The lens barrel according to any one of claims 1 to 3,
The adjustment member is
A screw that is screwed into the lens holding member, and presses an end surface of the fixed cylinder with an end thereof to form a gap capable of adjusting the distance between the lens holding member and the fixed cylinder. Characteristic lens barrel. The lens barrel according to claim 1, wherein
The fixing member is
A lens barrel, wherein the lens barrel is a screw that is screwed into the fixed cylinder through one of the lens holding members through a hole provided in the lens holding member via the elastic member. The lens barrel according to any one of claims 1 to 5,
3 or more each of the said fixing member and the said adjustment member are provided, The lens barrel characterized by the above-mentioned. The lens barrel according to any one of claims 1 to 6,
In the mounting part, the fixing member and the adjustment member are provided adjacent to each other in the circumferential direction . The lens barrel according to any one of claims 1 to 7,
The lens barrel characterized in that the pitch of the thread groove of the adjusting screw is narrower than the pitch of the thread groove of the mounting screw. An optical apparatus comprising the lens barrel according to any one of claims 1 to 8 .

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