JP2007226144A - Lens barrel and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel capable of reducing an influence of harmful reflected light, and to provide an electronic apparatus using the lens barrel. <P>SOLUTION: The lens barrel 10 includes: a second lens L2; a moving frame 5 that holds the second lens L2; a caulking part 5b intermittently provided on some of the whole periphery so as to partly caulk the outer peripheral edge part of the second lens L2 to the moving frame 5; and a light shielding member 6 or the like that covers the outer peripheral end part not fixed by the caulking part 5b to the moving frame 5 among the outer peripheral edge parts of the second lens L2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens barrel and an electronic device.

As a conventional technique, a lens barrel is known in which a lens is partially fixed by heat caulking to prevent an increase in the outer diameter of the lens (for example, Patent Document 1). However, the outer peripheral edge of the lens is exposed, and there is a problem that the optical characteristics deteriorate due to harmful reflected light reflected by the outer peripheral edge of the lens.
JP-A-4-136804

  An object of the present invention is to provide a lens barrel and an electronic apparatus that can reduce the influence of harmful reflected light.

The present invention solves the above problems by the following means. For ease of understanding, reference numerals corresponding to the drawings showing an embodiment of the present invention are given and described, but the present invention is not limited to this.
The invention of claim 1 includes an optical system (L2), a housing (5) provided with the optical system (L2), and a part of an outer peripheral edge of the optical system (L2). And a light-shielding member (6, 6) that covers an outer peripheral edge portion of the optical system (L2) that is not fixed to the housing (5) by the fixing portion (5b). 16) is a lens barrel (10, 10-2).
The invention of claim 2 is the lens barrel (10, 10-2) according to claim 1, wherein the optical system (L2) is a lens (L2), and the housing (5) is The lens barrel (10, 10-2) is a lens chamber (5).
A third aspect of the present invention is the lens barrel (10, 10-2) according to the first or second aspect, wherein the fixing portion (5b) connects the optical system (L2) to the housing. The lens barrel (10, 10-2) is characterized by being caulked and fixed to (5).
A fourth aspect of the present invention is the lens barrel (10, 10-2) according to any one of the first to third aspects, wherein the fixing portion (5b) includes the housing ( 5) A lens barrel (10, 10-2) that is partially provided along the circumferential direction of 5).
A fifth aspect of the present invention is the lens barrel (10, 10-2) according to any one of the first to fourth aspects, wherein the light shielding member (6, 16) is the housing. The lens barrel (10, 10-2) is characterized by being caulked and fixed to the body (5).
A sixth aspect of the present invention is the lens barrel (10, 10-2) according to the fifth aspect, wherein the light-shielding member (6, 16) is fixed on the outer side of the fixing portion (5b). This is a lens barrel (10, 10-2).
A seventh aspect of the invention is the lens barrel (10) according to any one of the first to sixth aspects, wherein the light shielding member (6) is located outside the optical system (L2). The lens barrel (10) is provided over the entire circumference of the peripheral edge.
The invention according to an eighth aspect is the lens barrel (10, 10-2) according to any one of the first to seventh aspects, in the circumferential direction of the housing (5). The lens barrel (10, 10-2) is characterized in that a protruding portion (5c) protruding in the radial direction of the casing (5) is provided in a portion where the fixing portion (5b) is not provided. ).
A ninth aspect of the present invention is an electronic apparatus using the lens barrel (10, 10-2) according to any one of the first to eighth aspects.
A tenth aspect of the present invention is the electronic apparatus according to the ninth aspect of the present invention, which is an electronic apparatus that is a still camera or a video camera.
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.

  ADVANTAGE OF THE INVENTION According to this invention, the lens barrel which can reduce the influence of harmful reflected light, and an electronic device using the same can be provided.

  Hereinafter, the present invention will be described in more detail with reference to the drawings and the like. The electronic device of the present invention can be, for example, a still camera, a video camera, an optical axis alignment device for adjusting optical performance, a light beam projection device, etc. In the following embodiments, a lens barrel is used. Let's take an example.

FIGS. 1 and 2 are views showing a lens barrel of the first embodiment, in which FIG. 1 is an optical axis cross-sectional view, and FIG. 2 is an AA cross-sectional view of FIG.
As shown in FIGS. 1 and 2, the lens barrel 10 of the first embodiment includes a first lens L1, a second lens L2, a third lens L3, a fixed barrel 1, an operation ring 2, and a cam pin 3. A camshaft 4, a moving frame 5, a light shielding member 6 and the like.

The first lens L1, the second lens L2, and the third lens L3 are arranged in this order from the subject side in the optical axis O direction. The second lens L2 has a chamfered portion L2a at the outer peripheral edge portion on the subject side.
The fixed cylinder 1 is a member that fixes the first lens L1, and includes a rectilinear hole 1a formed along the optical axis O and a bayonet 1b that is coupled to a camera body (not shown).
The operation ring 2 is a member that is held by the fixed cylinder 1 and is rotatable around the optical axis O. A cam 2 a is provided on the inner diameter side of the operation ring 2.
The cam pin 3 contacts the cam surface of the cam 2 a of the operation ring 2 and the rectilinear hole 1 a of the fixed cylinder 1.
The cam shaft 4 is a member that fixes the cam pin 3 to the moving frame 5.

The moving frame 5 is a member that is fitted into the fixed cylinder 1 and fixes the second lens L2 and the third lens L3, and includes two caulking portions 5a and 5b, a leg portion 5c, and a light shielding member fixing portion 5d. Have
The caulking portion 5a is a portion that is provided over the entire circumference of the moving frame 5 and fixes the third lens L3 to the moving frame 5 by heat caulking.
The leg 5c extends from the moving frame 5 to the subject side and is provided so as to protrude in the radial direction of the moving frame 5 (in this embodiment, three locations; see FIG. 2), the cam pin 3 and the cam shaft 4 It is a member for installing.

Unlike the caulking portion 5a, the caulking portion 5b is formed intermittently without reaching the entire circumference in the circumferential direction of the movable frame 5 (in this embodiment, the leg portion 5c 3 points between), the second lens L2 is fixed to the moving frame 5 by using the chamfered portion L2a and by heat caulking.
The reason that the caulking portion 5b is intermittently formed is that even if the lens barrel 10 is reduced in size and diameter, the movable frame 5 must be provided with two or three cam pins 3, This is because the base portion of the leg portion 5c and the caulking portion 5b overlap with each other due to such restrictions in optical design and interference of the structure, and the caulking portion 5b cannot be formed over the entire circumference.
The light shielding member fixing portion 5d is a member that fixes the light shielding member mounting portion 6a of the light shielding member 6 to the moving frame 5 by heat caulking.
The light shielding member 6 is a member that covers the entire outer peripheral edge of the second lens L <b> 2 including the caulking portion 5 b, and has a light shielding member attaching portion 6 a for fixing the light shielding member 6 to the moving frame 5. Further, as shown in FIG. 2, the light shielding member 6 is fixed to a portion outside the caulking portion 5b by the light shielding member fixing portion 5d and the light shielding member mounting portion 6a, where the leg portion 5c of the moving frame 5 is not provided. Has been. Therefore, the light shielding member 6 does not expose the chamfered portion L2a of the second lens L2.

Next, the operation of the lens barrel 10 of this embodiment will be described.
When the operation ring 2 is rotated, the cam pin 3 is guided to the cam 2a and the rectilinear hole 1a, and the cam pin 3 moves along the optical axis O. Since the cam pin 3 is fixed to the moving frame 5 by the cam shaft 4, the moving frame 5 moves along the optical axis O.
Then, the second lens L2 and the third lens L3 fixed to the moving frame 5 move along the optical axis O. At this time, if the movement of the second lens L2 and the third lens L3 is related to focusing, the focus adjustment is performed. If the movement is related to the focal length change, the zoom adjustment is performed. If the movement is related to the aberration change. Aberration adjustment is performed.

As described above, according to the lens barrel 10 of Example 1, the chamfered portion L2a of the second lens L2 that causes harmful reflected light is covered with the light shielding member 6, so that the chamfered portion L2a is exposed. Generation of harmful reflected light can be reduced.
In addition, since the generation of harmful reflected light can be reduced, the lens barrel 10 with good optical performance can be provided.
Further, the configuration of the present embodiment is suitable when the caulking portion 5b cannot be provided over the entire circumference of the lens due to design reasons such as downsizing.
Furthermore, since the light shielding member 6 covers the entire circumference of the outer peripheral edge of the second lens L2, there is no need to perform maintenance coating near the caulking portion 5b.

3 and 4 are diagrams showing a comparative example of the lens barrel, in which FIG. 3 is a cross-sectional view of the optical axis, and FIG. 4 is a cross-sectional view of FIG.
In addition, the description which overlaps the part which performs the same function as a present Example is abbreviate | omitted suitably (it is the same also in a following example).
As shown in FIGS. 3 and 4, the lens barrel 20 of the comparative example is not provided with the light shielding member 6 as in the first embodiment.
As a result, the chamfered portion L2a of the second lens L2 where the leg portion 5c is located is exposed as shown in FIG. 4, and the exposed chamfered portion L2a is liable to generate harmful reflected light. It is not preferable.
On the other hand, since the lens barrel 10 of the present embodiment can reduce the generation of harmful reflected light by the light shielding member 6, it is possible to solve such a problem.

5 and 6 are diagrams illustrating a lens barrel of the second embodiment. FIG. 5 is a cross-sectional view taken along the optical axis, and FIG. 6 is a cross-sectional view taken along the line CC in FIG.
The lens barrel 10-2 of the second embodiment is not a light shielding member 6 having a circular light shielding portion as in the first embodiment, but a light shielding member having an intermittent circular light shielding portion as shown in FIG. 16.
The light shielding member 16 is fixed to a portion outside the caulking portion 5b by the light shielding member fixing portion 5d and the light shielding member mounting portion 16a, where the moving frame 5 does not have the leg portion 5c.
The light shielding member 16 covers the chamfered portion L2a of the second lens L2 at a portion where the leg portion 5c is present, that is, a portion where the second lens L2 is not caulked by the caulking portion 5b. On the other hand, the chamfered portion L2a of the second lens L2 is covered with the caulked portion 5b in other portions, that is, the portion where the caulked portion 5b is present, and no harmful reflection light is generated. The chamfer L2a of the lens L2 is not covered.

As described above, according to the lens barrel 10-2 of Example 2, the caulking fixing position of the light shielding member 16 is outside the caulking fixing position of the second lens L2, and the light shielding member 16 covers the caulking portion 5b. Therefore, heat caulking of the light shielding member 16 and heat caulking of the caulking portion 5b can be performed at the same time in one step, which has the effect of reducing the man-hours.
Further, since all the chamfered portion L2a of the second lens L2 is covered by the caulking portion 5b and the light shielding member 16, generation of harmful reflected light can be reduced as in the first embodiment.

(Modification)
Each embodiment described above can be modified as follows.
(1) The second lens L2 may be an optical system such as a lens group and a reflecting mirror, for example. The optical system is not limited to a lens, and may be a plane parallel glass, an antireflection film, or the like.
(2) The second lens L2 has been described as an example of a lens having a chamfered portion L2a. However, the second lens L2 may be a lens that does not have a chamfered portion L2a. The same effect as the embodiment can be obtained.
(3) The second lens L2 has been described as being fixed to the moving frame 5. However, for example, the second lens L2 may be fixed to a housing such as a fixed frame or another member.

(4) Although the second lens L2 has been described as being caulked and fixed by the caulking portion 5b, it may be fixed by a separate member.
(5) The caulking has been described in the example of heat caulking, but normal caulking that is mechanically deformed may be used.
(6) In the lens barrel described above, the example in which the leg portion 5c protrudes has been described. However, even when other members such as an ultrasonic motor protrude in the radial direction of the moving frame 5, The configuration of each embodiment is effective.
Note that each of the above-described embodiments and modifications can be used in appropriate combination, but detailed description thereof will be omitted. Further, the present invention is not limited to the embodiments described above.

1 is a diagram illustrating a lens barrel of Example 1. FIG. 1 is a diagram illustrating a lens barrel of Example 1. FIG. It is a figure which shows the comparative example of a lens barrel. It is a figure which shows the comparative example of a lens-barrel. 6 is a diagram illustrating a lens barrel of Example 2. FIG. 6 is a diagram illustrating a lens barrel of Example 2. FIG.

Explanation of symbols

L1: first lens, L2: second lens, L2a: chamfered portion, L3: third lens, 1: fixed cylinder, 1a: straight hole, 1b: bayonet, 2: operation ring, 2a: cam, 3: cam pin, 4: cam shaft, 5: moving frame, 5a: caulking portion, 5b: caulking portion, 5c: leg portion, 5d: light shielding member fixing portion, 6, 16: light shielding member, 6a: light shielding member mounting portion, 10, 10- 2: Lens barrel, O: Optical axis

Claims (10)

Optical system,
A housing provided with the optical system;
A fixing portion for fixing a part of the outer peripheral edge of the optical system to the housing;
A light-shielding member that covers an outer peripheral edge portion of the optical system and covers a portion that is not fixed to the housing by the fixing portion. The lens barrel according to claim 1,
The optical system is a lens;
The lens barrel is characterized in that the casing is a lens chamber. The lens barrel according to claim 1 or 2, wherein
The lens barrel characterized in that the fixing section caulks and fixes the optical system to the housing. A lens barrel according to any one of claims 1 to 3, wherein
The lens barrel according to claim 1, wherein the fixing portion is partially provided along a circumferential direction of the casing. A lens barrel according to any one of claims 1 to 4, wherein
The lens barrel, wherein the light shielding member is fixed by caulking to the casing. The lens barrel according to claim 5,
The lens barrel, wherein a caulking fixing position of the light shielding member is outside the fixing portion. A lens barrel according to any one of claims 1 to 6, wherein
The lens barrel, wherein the light shielding member is provided over the entire circumference of the outer peripheral edge of the optical system. A lens barrel according to any one of claims 1 to 7, wherein
A lens barrel characterized in that, in the circumferential direction of the casing, a portion that is not provided with the fixing portion is provided with a protruding portion that protrudes in the radial direction of the casing.   An electronic apparatus using the lens barrel according to any one of claims 1 to 8. 10. The electronic device according to claim 9, wherein the electronic device is a still camera or a video camera.

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