JP7269124B2 - Lens device and imaging device - Google Patents

Description

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

2. Description of the Related Art Conventionally, when fixing a lens to a lens barrel in the assembly process of a lens device, adjustments are made for the distance between the lenses in the optical axis direction, the parallel eccentricity of the lenses, the inclination eccentricity of the lenses, and the like. For example, a washer is provided between the parts between the lenses and the thickness of the washer is changed to adjust the distance between the lenses. However, when the spacing is adjusted using washers, washers of various thicknesses are required according to the required amount of adjustment. Therefore, the number of parts and costs may increase.

Patent Documents 1 and 2 propose a structure in which an adjustment member that applies a biasing force is provided between a lens holding frame and a fixed member without using an adjustment washer, and the lens interval is adjusted by the feed amount of the screw.

Japanese Patent Application Laid-Open No. 2007-322709 JP 2012-194377 A

In the structures disclosed in Patent Documents 1 and 2, the holding frame is held by the elastic force of the adjusting member, which may be disadvantageous in stably holding the holding frame after adjustment.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens device that is advantageous in terms of, for example, adjustment of the position of a holding frame and stable holding.

In order to achieve the above object, the lens device of the present invention comprises:
a tubular member having a first female thread; a holding frame having a second female thread for holding an optical member ; a portion arranged in the hole; and a first male threaded portion screwed into the first female threaded portion; a fastening member to be fastened to a cylindrical member, wherein the outer diameter of the portion arranged in the hole of the fastening member and the inner diameter of the hole are different from each other, and the second Changing the position of the holding frame in the optical axis direction by changing the amount of screwing into the female screw portion, and changing the relative position between the portion arranged in the hole of the fastening member and the adjusting member. The position of the frame can be changed in a direction perpendicular to the optical axis direction .

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

Sectional view of the lens device in the present embodiment Enlarged view of the adjustment structure in the present embodiment FIG. 2 is a perspective view of a lens moving group in the present embodiment; FIG. 2 is a perspective view of a lens moving group in the present embodiment; Enlarged view of the adjustment member in the present embodiment

Preferred embodiments of the present invention are described in detail below 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 movable lens barrel (cylindrical member) that holds the lens of the lens device according to this embodiment. FIG. 5 is an enlarged view of the adjusting member in this embodiment.

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

In the fixed portion 9, there are two straight groove rollers 6 in the direction of the optical axis 1 and three phases in the direction of rotation about the optical axis 1. A total of six straight grooved rollers 6 are attached. The fixed portion 9 has a curved groove roller 7 that engages with a curved groove (not shown) provided in a curved groove ring 3 provided to the fixed ring 2 radially outwardly of the fixed ring 2 . are attached in the direction of rotation about . The curved grooved ring 3 is inserted into the fixed ring 2, and the curved grooved ring holder 4 is fixed to the fixed ring 2, so that the curved grooved ring 3 is restricted from moving freely in the optical axis direction with respect to the fixed ring 2, and the light is They are rotatably engaged in the direction of rotation about the shaft 1 . The holding frame 5 is moved by rotating the curved groove ring 3 with respect to the fixed ring 2 about the optical axis by means of a linear movement mechanism composed of these curved grooves, straight grooves, straight groove rollers 6, and curved groove rollers 7. The fixed fixing portion 9 becomes movable in the direction of the optical axis 1 .

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

The holding frame 5 has a threaded portion 13 (second female threaded portion) in which female threads are formed at positions (a plurality of locations along the circumferential end face) that are equally divided into three in the rotational direction about the optical axis 1. ). An adjusting member 10 having a threaded portion 14 (second male threaded portion) having a male thread is screwed to each of the threaded portions 13 at three locations. The adjusting member 10 is provided with a hole portion 15 passing through the threaded portion 14 in the axial direction. The fixing member (fastening member) 11 is inserted through the hole 15 , and the male threaded portion 111 (first male threaded portion) of the fixing member 11 is screwed into the female threaded portion 91 (first female threaded portion) provided in the fixing portion 9 . Then, the screw head 112 presses the adjustment member 10 toward the female screw portion side of the fixing portion 9 and fastens it, thereby fixing the holding frame 5 to the fixing portion 9 . The hole portion 15 of the adjusting member 10 has a first hole 101 with a diameter larger than the diameter of the male threaded portion 111 and smaller than the diameter of the screw head 112 and a second hole 102 with a diameter larger than the diameter of the screw head 112 .

A biasing member 12 is provided between the fixed portion 9 and the holding frame 5 . By screwing the fixing member 11 to the fixing portion 9 and fastening and fixing the adjusting member 10 to the fixing portion 9, the adjusting member 10 cannot rotate. Fixed.

Here, the biasing 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 the direction of separating the fixing portion 9 and the holding frame 5 from each other. As a result, movement of play between the female threaded portion of the holding frame 5 and the male threaded portion of the adjusting member 10 can be suppressed.

A method for adjusting the optical axis 1 direction 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 is moved in the direction of the optical axis 1 by the action of the threaded portions 13 and 14. As shown in FIG. In this embodiment, since three adjustment members 10 are provided at approximately equal intervals in the direction of rotation about the optical axis 1, each adjustment member 10 can be rotated by the same angle to move the holding frame 5 to the light. Axial translation is possible.

Here, a recessed adjustment portion (recess) 16 (slit) is provided in the portion of the adjustment member 10 where the second hole 102 is formed, and access to this adjustment portion 16 is performed using a tool such as a flathead screwdriver. By doing so, the adjusting portion 16 can be easily rotated at the time of adjustment. Although the adjusting portion 16 has a concave shape in this embodiment, it is not limited to this. By providing the biasing member 12 between the fixing portion 9 and the holding frame 5, the play component due to the screwing 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 direction of the optical axis 1 has been described above, the tilt of the holding frame 5 with respect to the optical axis 1 can also be adjusted in the structure of this embodiment. By making the angles of rotation of the adjusting members 10 different for each of the three adjusting members 10, the inclination of the holding frame 5 with respect to the optical axis 1 can be adjusted within the play of the threaded portions 13 and 14. FIG.

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

As described above, according to the structure of this embodiment, the adjustment of the interval in the optical axis direction of the holding frame 5, the tilt adjustment with respect to the plane perpendicular to the optical axis, and the component perpendicular to the optical axis can be performed with a single adjustment structure. Three adjustments can be made: adjusting the amount of shift in the including direction. Further, it is possible to stably hold the holding frame 5 after adjustment.

In this embodiment, the biasing force of the biasing member 12 is set in the direction in which the holding frame 5 and the fixing portion 9 are separated from each other. The biasing member may be designed for

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

Further, by constructing an image pickup apparatus having the lens apparatus of the present invention and an image pickup device arranged on the image plane of the lens apparatus, an image pickup apparatus having the effects 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 changes are possible within the scope of the gist.

5: Holding frame 9: Fixing part 10: Adjusting member 11: Fixing member (fastening member)
13: Threaded portion (second female screw portion)
14: Threaded portion (second male screw portion)
91: female threaded portion (first female threaded portion)
111: male threaded portion (first male threaded portion)

Claims (9)

a tubular member having a first female thread;
a holding frame that has a second female thread and holds the optical member ;
an adjusting member having a second male threaded portion screwed to the second female threaded portion and having a hole axially penetrating through the second male threaded portion;
a fastening member for fastening the adjustment member to the tubular member, the fastening member having a portion arranged in the hole and a first male threaded portion screwed into the first female threaded portion;
with
an outer diameter of the portion arranged in the hole of the fastening member and an inner diameter of the hole are different from each other,
changing the position of the holding frame in the optical axis direction by changing the screwing amount of the second male threaded portion to the second female threaded portion; the portion of the fastening member arranged in the hole; and the position of the holding frame in a direction perpendicular to the optical axis direction can be changed by changing the position relative to the holding frame . 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 face of the tubular member. The lens device according to claim 1, characterized by: 2. An urging member disposed between said holding frame and said tubular member for urging said holding frame and said tubular member in a direction of separating from or approaching each other. 3. A lens device according to item 2. The fastening member has a screw head having a diameter larger than the diameter of the first male threaded portion,
The adjustment member has, as the holes, a first hole having a diameter larger than the diameter of the first male screw portion and 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,
4. The lens device according to any one of claims 1 to 3, characterized in that: 5. 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 threaded portion is engaged. 6. The lens device according to claim 1, wherein the holding frame holds a lens as the optical member. 7. The lens device according to claim 1, wherein the holding frame holds a filter as the optical member. 8. 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. a lens device according to any one of claims 1 to 8;
an imaging device that receives an image formed by the lens device;
An imaging device characterized by comprising:

Images