JP2021018351A - Lens unit and imaging apparatus - Google Patents

Abstract

To provide a lens unit advantageous in adjusting the position of a holding frame and stably holding, for example.SOLUTION: The lens unit includes: a cylindrical member having a first female screw 91; a holding frame 5 that has a second female screw 13 and holds an optical member; an adjustment member 10 that has a hole 15 formed for allowing the second male screw 14 in the axial direction and a second male screw 14 which screws into the second female screw 13; and a fastening member that has a part arranged in the hole and a first male screw 111 screwed in the first female screw 91 to fasten the adjustment member 10 to the cylindrical member.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lens device and an imaging device.

Conventionally, in fixing a lens to a lens barrel in the assembly process of a lens device, adjustments such as the distance between lenses in the optical axis direction, parallel eccentricity of the lens, and tilt eccentricity of the lens are adjusted. For example, a washer is provided between the parts between the lenses, and the distance between the lenses is adjusted by changing the thickness thereof. However, when the interval is adjusted using a washer, washers of various thicknesses are required depending on the required adjustment amount. Therefore, the number of parts and the cost can be increased.

Patent Documents 1 and 2 propose a structure in which an adjusting member for applying an urging force is provided between a lens holding frame and a fixing member without using an adjusting washer, and a lens spacing is adjusted according to a screw feed amount.

JP-A-2007-322709 Japanese Unexamined Patent Publication No. 2012-194377

In a structure such as Patent Documents 1 and 2, since the holding frame is held by the elastic force of the adjusting member, it may be disadvantageous to stably hold the holding frame after adjustment.

An object of the present invention is, for example, to provide a lens device which is advantageous in terms of adjusting the position of a holding frame and stable holding.

In order to achieve the above object, the lens device of the present invention includes a tubular member having a first female screw portion, a holding frame for holding an optical member, a holding frame having a second female screw portion, and the second female screw portion. An adjusting member having a second male threaded portion screwed into the female threaded portion and having a hole formed through the second male threaded portion in the axial direction, a portion arranged in the hole, and the first female thread. It is characterized by having a first male screw portion screwed into the portion, and having a fastening member for fastening the adjusting member to the tubular member.

According to the present invention, for example, it is possible to provide a lens device that is advantageous in terms of adjusting the position of the holding frame and stable holding.

Cross-sectional view of the lens device in this embodiment Enlarged view of the adjustment structure in this embodiment Perspective view of the lens moving group in this embodiment Perspective view of the lens moving group in this embodiment Enlarged view of the adjusting member in this embodiment

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of the lens device in this embodiment. FIG. 2 is an enlarged view of the adjustment structure of the lens device in this embodiment. 3 and 4 are perspective views of a moving lens barrel (cylindrical member) that holds the lens of the lens device in this embodiment. FIG. 5 is an enlarged view of the adjusting member in this embodiment.

The lens device in this embodiment will be described with reference to FIGS. 1 to 5.
The holding frame 5 for holding the lens has a lens receiving portion 51 having an inner diameter portion smaller than the outer diameter of the lens 20. The presser ring 8 is screwed into the female screw portion 52 of the holding frame 5 to sandwich the lens 20 with the lens receiving portion 51, and the lens 20 is fixed and held by the holding frame 5. The holding frame 5 is fixed to the fixing portion (moving lens barrel) 9 via the adjusting member 10. The fixed structure will be described in detail later.

The fixed portion 9 has two straight groove rollers 6 that engage with a straight groove (not shown) provided on the fixed ring 2 in the optical axis 1 direction and three phases in the rotational direction about the optical axis 1. It is configured and a total of 6 straight groove rollers 6 are attached. Further, in the fixing portion 9, a curved groove roller 7 engaged with a curved groove (not shown) provided in the curved groove ring 3 provided on the radial outer side of the fixed ring 2 with respect to the fixed ring 2 is provided on the optical axis 1. Two are attached in the direction of rotation centered on. The curved groove ring 3 is inserted through the fixed ring 2, and the curved groove ring retainer 4 is fixed to the fixed ring 2, so that the curved groove ring 3 is restricted from freely moving in the optical axis direction with respect to the fixed ring 2, and is light. It is rotatably engaged in the direction of rotation about the shaft 1. The holding frame 5 is formed by rotating the curved groove ring 3 with respect to the fixed ring 2 about the optical axis by the straight traveling mechanism composed of the curved groove, the straight groove, the straight groove roller 6, and the curved groove roller 7. The fixed fixed portion 9 becomes movable in the direction of the optical axis 1.

Next, the structure for adjusting the fixed position of the holding frame 5 fixed to the lens with respect to the fixed portion 9 in this embodiment will be described.

The holding frame 5 has a screw portion 13 (second female screw portion) in which a female screw is formed at a position (a plurality of locations along the circumferential end face) which is divided into three equal parts in the rotation direction about the optical axis 1. ). An adjusting member 10 having a screw portion 14 (second male screw portion) on which a male screw is formed is screwed into each of the three screw portions 13. The adjusting member 10 is provided with a hole portion 15 penetrating in the axial direction of the screwed portion 14. The fixing member (fastening member) 11 is inserted through the hole 15, and the male screw portion 111 (first male screw portion) of the fixing member 11 is screwed into the female screw portion 91 (first female screw portion) provided in the fixing portion 9. Then, the adjusting member 10 is pressed and fastened to the female screw portion side of the fixing portion 9 by the screw head 112 to fix the holding frame 5 to the fixing portion 9. The hole portion 15 of the adjusting member 10 has a first hole 101 having a diameter larger than the diameter of the male screw portion 111 and a diameter smaller than the diameter of the screw head 112, and a second hole 102 having a diameter larger than the diameter of the screw head 112.

An urging member 12 is attached between the fixing portion 9 and the holding frame 5. By screwing the fixing member 11 into the fixing portion 9 and fastening and fixing the adjusting member 10 to the fixing portion 9, the adjusting member 10 cannot rotate. Therefore, the fixing portion 9 screwed with the adjusting member 10 is It is fixed.

Here, the urging member 12, which is an elastic member, is arranged between the fixing portion 9 and the holding frame 5, and exerts an elastic force in a direction in which the fixing portion 9 and the holding frame 5 are separated from each other. As a result, the movement of the play amount between the female screw portion of the holding frame 5 and the male screw portion of the adjusting member 10 can be suppressed.

A method of adjusting one direction of the optical axis of the lens 20 will be described. By loosening the fixing member 11, the adjusting member 10 becomes rotatable. By rotating the adjusting member 10, the holding frame 5 moves in the optical axis 1 direction by the action of the screwed portions 13 and 14. In this embodiment, three adjusting members 10 are attached at substantially equal intervals in the rotation direction about the optical axis 1, so that the holding frame 5 is illuminated by rotating each adjusting member 10 at the same angle. It can be translated in the axial direction.

Here, a concave adjusting portion (recess) 16 (sliding) is provided in a portion of the adjusting member 10 in which the second hole 102 is formed, and the adjusting portion 16 can be accessed by using a tool such as a flat-blade screwdriver. This makes it easier to rotate the adjusting unit 16 during adjustment. In this embodiment, the adjusting portion 16 has a concave shape, but the present invention is not limited to this. By attaching the urging member 12 between the fixing portion 9 and the holding frame 5, the play component due to the screwed portions 13 and 14 can be suppressed. After adjusting the position of the holding frame 5 by rotating the adjusting member 10, the holding frame 5 can be stably fixed to the fixing portion 9 by fixing the adjusting member 10 with the fixing member 11.

Although the method of adjusting the lens 20 in the optical axis 1 direction has been described above, in the structure of this embodiment, it is possible to adjust the tilt of the holding frame 5 with respect to the optical axis 1. By making the rotation angle of the adjusting member 10 different for each of the three adjusting members 10, it is possible to adjust the tilt of the holding frame 5 with respect to the optical axis 1 within the play of the screwed portions 13 and 14.

Further, by using the difference between the inner diameter of the hole 15 of the adjusting member 10 and the outer diameter of the fixing member 11, it is possible to adjust the eccentricity of the holding frame 5 in the direction perpendicular to the optical axis.

As described above, according to the structure of the present embodiment, one adjustment structure can be used to adjust the distance between the holding frames 5 in the optical axis direction, to adjust the tilt of the holding frame 5 with respect to the plane perpendicular to the optical axis, and to adjust the components perpendicular to the optical axis. It is possible to make three adjustments: adjustment of the shift amount in the including direction. Further, the adjusted holding frame 5 can be stably held.

In this embodiment, the urging force of the urging member 12 is in the direction in which the holding frame 5 and the fixing portion 9 are separated from each other, but this is such that the holding frame 5 and the fixing portion 9 are urged in the direction in which they approach each other. The urging member may be designed.

In the present embodiment, the configuration in which the holding frame 5 holds the lens has been described, but the present invention is not limited to this, and the same can be applied to a configuration in which an optical member such as an optical filter is held.

Further, by configuring the lens device of the present invention and an image pickup device having an image pickup device arranged on the image plane of the lens device, an image pickup device having the effect of the present invention can be realized.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

5: Holding frame 9: Fixing part 10: Adjusting member 11: Fixing member (fastening member)
13: Screwed part (second female threaded part)
14: Screwed part (second male threaded part)
91: Female thread part (first female thread part)
111: Male threaded part (first male threaded part)

Claims (9)

A tubular member having a first female thread and
A holding frame for holding the optical member and having a second female thread portion,
An adjusting member having a second male threaded portion screwed into the second female threaded portion and having a hole formed through the second male threaded portion in the axial direction thereof.
A fastening member having a portion arranged in the hole and a first male threaded portion screwed into the first female threaded portion, and fastening the adjusting member to the tubular member.
A lens device characterized by having. The first female threaded portion, the second female threaded portion, the first male threaded portion, and the second male threaded portion are arranged at a plurality of locations along the circumferential end surface of the tubular member. The lens device according to claim 1. 1 or claim, wherein the holding frame and the tubular member are arranged between the holding frame and the tubular member, and have an urging member that urges the holding frame and the tubular member in a direction in which they are separated from each other or approach each other. Item 2. The lens device according to item 2. The fastening member has a screw head having a diameter larger than the diameter of the first male screw portion.
The adjusting member includes, as the holes, a first hole having a diameter larger than the diameter of the first male screw portion and a diameter smaller than the diameter of the screw head, and a second hole having a diameter larger than the diameter of the screw head. Is formed,
The lens device according to any one of claims 1 to 3, wherein the lens device is characterized by the above. The lens device according to any one of claims 1 to 4, wherein the adjusting member has a recess with which a tool for rotating the second male screw portion is engaged. The lens device according to any one of claims 1 to 5, wherein the holding frame holds a lens as the optical member. The lens device according to any one of claims 1 to 6, wherein the holding frame holds a filter as the optical member. The lens device according to any one of claims 1 to 7, wherein the tubular member is movable in the direction of the optical axis. The lens device according to any one of claims 1 to 8.
An image sensor that receives the image formed by the lens device and
An imaging device characterized by having.

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