WO2019021702A1 - Imaging device - Google Patents

Abstract

An imaging device equipped with a lens barrel for holding a lens, a holder having an opening which holds the lens barrel, a substrate on which an imaging element for imaging by receiving light which has passed through the lens is mounted, a spacer which is secured to the holder and is positioned between the substrate and the lens barrel, and a biasing member for biasing the lens barrel rearward in the optical axis direction, wherein the location of the lens barrel in the optical axis direction changes according to the contact position in the rotation direction between the lens barrel and the spacer.

Description

Imaging device

One embodiment of the present invention relates to an imaging device and the like.

In an imaging device such as a camera, at the time of assembly, focus adjustment is performed by adjusting the position of the lens relative to the position of the imaging element in the optical axis direction. In order to make it easy to adjust the focus at the time of assembly and to prevent the adjusted focus from shifting, various configurations are conventionally employed. In the configuration described in Patent Document 1, the position of the lens in the optical axis direction is stabilized by urging the lens holding member toward the front side (subject side). In the configuration described in Patent Document 2, the position of the lens barrel in the direction of the optical axis is fixed by pressing the lens barrel toward the image pickup device side at the time of assembly and adhering and fixing the lens barrel.

International Publication No. 2016/121165 Unexamined-Japanese-Patent No. 2006-222473

However, in the above-described conventional configuration, the position of the lens may be shifted after assembly, and the focus may be shifted. In the configuration described in Patent Document 1, when the user presses the lens from the front side, the lens may move to the rear side (the imaging device side). In the configuration described in Patent Document 2, changes in temperature and humidity may cause degradation of the adhesive, which may shift the position of the lens barrel.

The present invention adopts the following means in order to solve the above-mentioned problems and the like. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to the appended ones. It should be interpreted broadly to the extent that the vendor can understand technically.

One means of the present invention is
A lens barrel (3) holding a lens;
A holder (1) having an opening for holding the lens barrel;
A substrate (5) on which an imaging device for receiving and imaging light transmitted through the lens is mounted;
A spacer (4) fixed to the holder and disposed between the substrate and the lens barrel;
And a biasing member (2) for biasing the lens barrel rearward in the optical axis direction,
The position of the lens barrel in the optical axis direction changes in accordance with the contact position between the lens barrel and the spacer in the rotational direction.
It is an imaging device.

In the imaging apparatus having the above configuration, since the lens barrel is biased rearward in the optical axis direction, the lens barrel in the optical axis direction even when the user presses the lens or the lens barrel from the front side. Position does not shift. By this, it is possible to suppress out of focus at the time of use. Further, since the lens barrel is not fixed in position by the adhesive, the position of the lens barrel can be stabilized even if the temperature or humidity changes. Further, the position of the lens barrel in the direction of the optical axis can be changed by rotating the lens barrel or the like, whereby focus adjustment can be performed.

In the above imaging apparatus, preferably
The lens barrel (3) is rotatably held by the holder (1).

According to the imaging apparatus having the above configuration, it is possible to perform focus adjustment by rotating the lens barrel.

In the above imaging apparatus, preferably
The lens barrel (3) is radially fitted with the holder (1) so as to be movable in the optical axis direction.

According to the imaging apparatus having the above configuration, while the lens barrel is moved in the optical axis direction, focus adjustment is performed, while the movement of the lens barrel in the direction perpendicular to the optical axis is restricted to shift the optical axis. It can be set as suppression composition.

In the above imaging apparatus, preferably
The lens barrel (3) has a convex portion (33) at the rear in the optical axis direction,
The spacer has a cam surface (41) whose position in the optical axis direction changes in accordance with the contact position at a position where the spacer contacts the convex portion.

According to the imaging apparatus having the above configuration, the position of the lens barrel in the optical axis direction changes at the contact position between the convex portion and the cam surface, so the position of the lens barrel is adjusted with a relatively simple configuration. It becomes possible to perform focus adjustment. In addition, since the configuration is relatively simple, it is possible to suppress the manufacturing cost and the like.

In the above imaging apparatus, preferably
The spacer has a convex portion forward in the optical axis direction,
The lens barrel has a cam surface whose position in the optical axis direction changes in accordance with the contact position, at a position where the lens barrel contacts the convex portion.

According to the imaging apparatus having the above configuration, the position of the lens barrel in the optical axis direction changes at the contact position between the convex portion and the cam surface, so the position of the lens barrel is adjusted with a relatively simple configuration. It becomes possible to perform focus adjustment. In addition, since the configuration is relatively simple, it is possible to suppress the manufacturing cost and the like.

In the above imaging apparatus, preferably
The spacer (4) screw-engages with the holder (1) (43), and is diametrically engaged with the holder (44) at a position different from the screw-engaging position.

According to the imaging apparatus having the above configuration, since the spacer is accurately held by the holder, the position of the lens barrel disposed in contact with the spacer can be further stabilized. This makes it possible to perform focus adjustment more accurately.

FIG. 1 is an external perspective view of an imaging device as viewed from the front side. FIG. 2 is an exploded perspective view of the imaging device as viewed from the front side. FIG. 3 is a cross-sectional view of the imaging device.

The image pickup apparatus according to the present invention is an apparatus such as a camera that picks up an image of a subject and acquires image data, and the lens mirror does not generate a focus shift even when the user presses the lens barrel to the rear side. One of the features is that the cylinder is held while being biased toward the rear side.

Embodiments according to the present invention will be specifically described with reference to the drawings according to the following configuration. However, the embodiments described below are merely examples of the present invention, and the technical scope of the present invention is not to be interpreted in a limited manner. In the drawings, the same components are denoted by the same reference numerals, and the description thereof may be omitted.
1. Embodiment 2. Supplementary items

In the present specification, the center position of the lens and the center position of the light incident on the imaging device is referred to as an “optical axis”. An imaging target located on the opposite side to the imaging element with respect to the lens is referred to as a "subject". The direction in which the subject is positioned with respect to the imaging device is referred to as “front side” or “forward in the optical axis direction”, and the direction in which the imaging device is positioned relative to the subject is referred to as “rear side” or “rear in the optical axis direction”.

<1. Embodiment>
First, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the imaging device of the present embodiment as viewed from the front side. FIG. 2 is an exploded perspective view of the imaging device of this embodiment as viewed from the front side. FIG. 3 is a cross-sectional view of the imaging device of the present embodiment.

As shown in FIGS. 1 to 3, the imaging device of the present embodiment includes a holder 1, a compression spring 2, a lens barrel 3, a cam member 4, and a substrate 5.

<Holder 1>
The holder 1 holds the compression spring 2, the lens barrel 3, and the cam member 4. The holder 1 is connected to the substrate 5 at the rear in the optical axis direction by connection screws 61 and 62. The holder 1 and the substrate 5 may be connected to each other using a connecting tool other than a screw, such as a rivet. The holder 1 and the substrate 5 may be connected by an adhesive, but it is preferable to use a connector such as a screw to facilitate disassembly after assembly.

The holder 1 has an opening 1 a centered on the optical axis. As shown in FIG. 3, the opening 1 a is formed at a position inside the holder 1 in a combination of a plurality of cylindrical shapes having different inner diameters and extending in the optical axis direction. The compression spring 2, the lens barrel 3, and the cam member 4 are sequentially inserted and held in the opening 1 a from the rear in the optical axis direction. As shown in FIG. 3, the lens barrel 3 is rotatably held inside the holder 1 with the lens barrel 3 fitted in a diameter. The cam member 4 is held inside the holder 1 in a screw-fitted state. That is, a screw thread is formed on the inner side in the radial direction of the holder 1 and at a position facing the cam member 4, and the holder 1 and the cam member 4 are fitted by this screw thread. The rear surface of the holder 1 in the optical axis direction is fixed in contact with the substrate 5.

<Lens barrel 3>
The lens barrel 3 is formed of a first cylindrical portion 31 and a second cylindrical portion 32 each cylindrically extending in the optical axis direction, and holds one or more lenses including the lens 34 and other optical members. The first cylindrical portion 31 has an outer diameter smaller than that of the second cylindrical portion 32, and is located forward in the optical axis direction than the second cylindrical portion 32. The first cylindrical portion 31 and the second cylindrical portion 32 are integrally formed.

In the assembled state, the entire lens barrel 3 is inserted into the holder 1 (see FIG. 3 and the like) and held by the holder 1. The first cylindrical portion 31 of the lens barrel 3 is inserted to the front of the opening 1 a of the holder 1 in the optical axis direction.

As shown in FIG. 3, the front surface in the optical axis direction of the second cylindrical portion 32 of the lens barrel 3 abuts on the compression spring 2. The lens barrel 3 is biased rearward in the optical axis direction by the biasing force applied from the compression spring 2.

From the rear surface of the second cylindrical portion 32 of the lens barrel 3 in the optical axis direction, the convex portion 33 protrudes rearward in the optical axis direction. The convex portion 33 partially protrudes along the outer peripheral surface of the second cylindrical portion 32. The convex portion 33 is in contact with a cam surface 41 formed on the front side of the cam member 4 in the optical axis direction. The lens barrel 3 is rotatable around the optical axis, and when the lens barrel 3 rotates, the convex portion 33 moves along the outer periphery of the lens barrel 3. When the convex portion 33 moves, the contact position between the convex portion 33 and the cam surface 41 of the cam member 4 changes. As described later, since the cam surface 41 is inclined with respect to the surface perpendicular to the optical axis, when the contact position between the convex portion 33 and the cam surface 41 changes, the lens barrel in the optical axis direction The position of 3 changes. When the position of the lens barrel 3 in the optical axis direction changes, the positions of the lens barrel 3 and the lens (the distance between the imaging element 51 and the lens) with respect to the imaging element 51 in the optical axis direction change. To be done.

Each lens including the lens 34 is an optical member which is formed of a transparent material such as glass or plastic and transmits light backward in the optical axis direction while refracting light from the front in the optical axis direction. The optical member includes a lens. The optical member held by the lens barrel 3 includes, in addition to the lens, a spacer, an aperture plate, an optical filter (all not shown), and the like. The spacer is a disk-shaped member having a suitable thickness in the optical axis direction, and adjusts the position of each lens in the optical axis direction. The spacer has an opening at the center including the optical axis. The aperture plate determines the outermost position of the passing light. An optical filter suppresses or blocks light of a predetermined wavelength. The optical filter includes, for example, an infrared cut filter that suppresses infrared light passing therethrough. The number of these optical members can be arbitrarily changed.

<Compression spring 2>
The compression spring 2 is disposed between the holder 1 and the lens barrel 3 and is in contact with the surface of the holder 1 in the optical axis direction and the surface of the second cylindrical portion 32 of the lens barrel 3 in the optical axis direction. Contact. The compression spring 2 biases the holder 1 forward in the optical axis direction and rearwards the lens barrel 3 in the optical axis direction. Thus, the lens barrel 3 is urged toward the cam member 4. The compression spring 2 is formed in an annular shape, and is disposed so that the first cylindrical portion 31 of the lens barrel 3 is located radially inward. The compression spring 2 may be replaced with another biasing member such as a leaf spring. The compression spring 2 is an example of the "biasing member" in the present invention.

<Cam member 4>
The cam member 4 is disposed between the lens barrel 3 and the substrate 5. The optical axis direction front of the cam member 4 is a cam surface 41 having an inclination in the circumferential direction. In other words, the cam surface 41 is inclined with respect to a plane perpendicular to the optical axis. The cam surface 41 is in contact with the convex portion 33 of the lens barrel 3. The cam member 4 is one structural example of the "spacer" in the present invention.

The cam member 4 is in contact with the holder 1 at the front surface 42 in the optical axis direction. Further, on the rear side of the surface 42 in contact with the holder 1, a thread 43 is formed on the outer periphery of the cam member 4, and is screw-engaged with the thread formed on the inside of the holder 1. As described above, since the cam member 4 is screw-fitted while being in contact with the holder 1 in the optical axis direction, the cam member 4 is fixed in position without rattling with respect to the holder 1.

Further, the cam member 4 is in radial engagement with the holder 1 at a portion on the front side of the surface 42 in contact with the holder 1 and having a diameter smaller than the position where the screw thread 43 is formed. Thus, while the cam member 4 is screwed with the holder 1 by the screw thread 43, the cam member 4 is diametrically engaged with the holder 1 on the front side (forward in the optical axis direction) than the screwing position. Therefore, the spacer 4 is held with high accuracy by the holder 1, so that the position in the optical axis direction of the lens barrel 3 whose position in the optical axis direction is fixed is stabilized by contacting the cam surface 41 of the spacer 4. Can be As a result, it becomes possible to adjust the position of the lens with respect to the imaging device 51 with high accuracy, and it becomes possible to perform focus adjustment with high accuracy. The position at which the cam member 4 and the holder 1 are diametrically fitted does not necessarily have to be on the front side of the screwing position, but may be on the rear side. Further, in the present invention, “diameter fitting” refers to a state of being fitted by being disposed in the radial direction with substantially no gap.

<Substrate 5>
The substrate 5 mounts the imaging device 51 and other electronic components (not shown). As shown in FIG. 3, the front surface of the substrate 5 in the optical axis direction is in contact with the rear surface of the holder 1 in the optical axis direction. The substrate 5 and the holder 1 are connected by connection screws 61 and 62. The front surface of the substrate 5 in the optical axis direction may be disposed with a gap from the holder 1 for position adjustment between the imaging device 51 and the lens held by the lens barrel 3 in the optical axis direction. good. In this case, the distance between the substrate 5 and the holder 1 is adjusted by the screwing amount of the connection screws 61 and 62 or the like.

The image pickup device 51 is a photoelectric conversion device that receives light transmitted through a lens or the like held in the lens barrel 3 and converts the light into an electric signal and outputs the electric signal, and is, for example, a C-MOS sensor or a CCD. The imaging device 51 may be replaced with another imaging unit such as a film.

As described above, in the imaging apparatus according to the present embodiment, the lens barrel 3 is biased rearward by the compression spring 2 instead of the optical axis direction, and the position of the lens barrel 3 in the optical axis direction is the optical axis. It changes according to the contact position of the lens barrel 3 and the cam member 4 in the rotation direction. Therefore, even when the user presses the lens 34 or the lens barrel 3 from the front side toward the rear side, the position of the lens barrel 3 in the optical axis direction does not shift. By this, it is possible to suppress out of focus at the time of use. Further, since the position of the lens barrel 3 is not fixed by the adhesive, the position of the lens barrel 3 can be stabilized even if the temperature or humidity changes. Further, by rotating the lens barrel 3, the position of the lens barrel 3 in the optical axis direction can be changed, whereby focus adjustment can be performed.

In the image pickup apparatus of the present embodiment, the lens barrel 3 has the convex portion 33 projecting backward in the optical axis direction, and the cam member 4 has the cam surface 41 forward in the optical axis direction. It may be arranged reversely. That is, a cam surface may be formed on the rear side of the lens barrel 3 in the optical axis direction, and the cam member 4 may have a convex portion on the front side in the optical axis direction. Even with such a configuration, the contact position between the cam surface of the lens barrel 3 and the convex portion of the cam member 4 changes by rotating the lens barrel 3 around the optical axis. The position of the lens barrel 3 in the optical axis direction can be changed, and the same effect as that of the present embodiment can be obtained.

Further, in the imaging apparatus of the present embodiment, since the lens barrel 3 is rotatably held by the holder 1, it is possible to perform focus adjustment by rotating the lens barrel 3. it can.

Further, in the imaging apparatus of the present embodiment, since the lens barrel 3 is movably fitted in the optical axis direction with the holder 1, the focus adjustment is performed while moving the lens barrel 3 in the optical axis direction. On the other hand, the movement in the direction perpendicular to the optical axis can be restricted to suppress the deviation of the optical axis.

In addition, in the imaging device of the present embodiment, an adhesive may be used to fix each member more reliably. Even in the case where an adhesive is used, in the imaging device of the present embodiment, the positions of the respective members are stabilized by the biasing force given by the compression spring 2 or the like, so even if the temperature or humidity changes, It is possible to suppress the displacement of the position of the member.

<2. Additional Notes>
The specific description of the embodiment of the present invention has been described above. In the above description, the description is merely an embodiment, and the scope of the present invention is not limited to the one embodiment, and can be broadly interpreted to a range that can be grasped by those skilled in the art.

The present invention is suitably used as an imaging device such as a camera in which the position of the optical axis is stable and the occurrence of focus shift is suppressed.

DESCRIPTION OF SYMBOLS 1 ... Holder 1a ... Opening part 2 ... Compression spring 3 ... Lens barrel 31 ... 1st cylindrical part 32 ... 2nd cylindrical part 33 ... Convex part 34 ... Lens 4 ... Cam member 41 ... Cam surface 5 ... Substrate 51 ... Imaging element 61, 62 ... connecting screw

Claims (6)

A lens barrel that holds a lens,
A holder having an opening for holding the lens barrel;
A substrate on which an imaging device for receiving and imaging light transmitted through the lens is mounted;
A spacer fixed to the holder and disposed between the substrate and the lens barrel;
And a biasing member for biasing the lens barrel rearward in the optical axis direction,
The position of the lens barrel in the optical axis direction changes in accordance with the contact position between the lens barrel and the spacer in the rotational direction.
Imaging device. The lens barrel is rotatably held by the holder.
The imaging device according to claim 1. The lens barrel is radially fitted with the holder so as to be movable in the optical axis direction.
The imaging device according to claim 1 or 2. The lens barrel has a convex portion at the rear in the optical axis direction,
The spacer has a cam surface in which the position in the optical axis direction changes in accordance with the contact position, at a position where the spacer contacts the convex portion.
The imaging device according to any one of claims 1 to 3. The spacer has a convex portion forward in the optical axis direction,
The lens barrel has a cam surface at a position in contact with the convex portion, the position in the optical axis direction changing according to the contact position.
The imaging device according to any one of claims 1 to 3. The spacer screw-engages with the holder, and is radially fitted with the holder at a position different from the screw-engaging position.
The imaging device according to any one of claims 1 to 5.

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