KR101256880B1 - Lens fixing unit and camera device - Google Patents

Abstract

(Problem) To prevent scattering of foreign matters in the optical path when fixing the position of the lens unit.
(Solution means) The lens unit 250B including the lens 271, the holder unit 200B including the cylindrical lens unit attaching portion 210, and the lens unit attaching portion 210 are movable. A lens fixing unit having a fixing screw 290 that is screwed from the outside of the barrel of the lens unit mounting portion 210 toward the inside of the barrel for fixing the position of the lens unit 250B to be mounted, wherein the lens unit mounting portion 210 The non-penetrating hole 231 which does not penetrate into the cylinder of the said lens unit mounting part 210 is provided, and the bottom part of the said non-penetrating hole 231 and the inner surface of the cylinder of the said lens unit mounting part 210 are provided. The intervening portion 232 therebetween is formed to a thickness that is pressed by the tip of the fixing screw 290 screwed into the non-penetrating hole 231 and deforms toward the inside of the cylinder of the lens unit mounting portion 210. .

Description

Lens fixing unit and camera unit {LENS FIXING UNIT AND CAMERA DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens fixing unit for a camera and a camera device constructed by using the lens fixing unit.

Background Art In recent years, compact camera devices have been mounted in various devices such as notebook personal computers, mobile phones, vehicles, and monitoring devices. This type of camera device is provided with a lens and an image pickup device, and optical elements such as a filter or an iris as necessary on an optical path therebetween. Is arranged. In the lens, a lens fixing unit is used to mount a camera device (hereinafter, simply referred to as a "camera body") of a camera device incorporating an optical element or the like (see Patent Document 1, for example).

As the lens fixing unit, a male screw part is provided on the side of the lens unit that supports the lens, while the male screw part is screwed on the side of the holder unit attached to the camera body. Some female screw sections are provided, and some are configured to fix the lens unit and the holder unit by screwing both screw sections (see, for example, Patent Document 1). In the lens fixing unit of such a configuration, the focusing of the lens is made by the degree of rotation of the male screw portion with respect to the female screw portion. That is, it is possible to focus the lens on the image pickup device by finely adjusting the screwing state of both screw portions.

After the focusing of the lens is finished, replacement or refocusing of the lens unit is unnecessary for the use of the small camera device. For this reason, there exists a structure in which the fixing screw for fixing the position of a lens unit is attached to a holder unit as a lens fixing unit. Specifically, the fixing screw is screwed from the outside of the holder unit in a direction orthogonal to the axial direction of both screw portions to be screwed, and the tip of the fixing screw is brought into close contact with the male screw portion of the lens unit. The position of the lens unit with respect to the holder unit is fixed (see Patent Document 2, for example).

Japanese Unexamined Patent Publication No. 2009-92866 Published Japanese Utility Model Model Publication No. 07-39006

In the above-described conventional lens fixing unit, the tip of the fixing screw is fixed to the male screw to fix the position of the lens unit. Therefore, it is necessary to provide a through hole for mounting the fixing screw in the holder unit. Therefore, there exists a possibility that the problem described below may arise.

In the case where the fixing screw hole has a through hole structure, when the lens unit is fixed in position, the tip of the fixing screw is in direct contact with the male screw part of the lens unit. Therefore, depending on the fastening state of the fastening screw, there is a possibility that foreign matter such as dust, dust, etc. may be generated from the portion directly contacted. If such foreign matter is scattered in the optical path, it will adversely affect the photographing result of the image pickup device, so that the occurrence of the foreign matter should be prevented in advance.

In addition, the holder unit may be manufactured by molding, such as die casting or injection molding. By the way, when the hole for fixing screws is made into a through-hole structure, since it is very difficult to provide a through-hole by a shaping | molding process, post-processing for forming a through hole after the said shaping | molding process is needed. Even after the through-hole is formed by post-processing, post-processing with additional grinding or the like is necessary in order to prevent processing marks such as burrs from remaining on the inner circumferential side of the female screw portion. Done. In other words, the through-hole structure is not a structure that can be easily manufactured by molding, so there is a difficulty in terms of manufacturing cost.

Accordingly, an object of the present invention is to provide a lens fixing unit and a camera device having a structure suitable for fabrication by forming and preventing foreign matter scattering into the optical path in fixing the position of the lens unit. .

The present invention has been devised to achieve the above object.

According to a first aspect of the present invention, there is provided a lens unit including a lens and a lens unit attaching portion formed in a cylindrical shape, wherein the lens is provided in a cylinder of the lens unit attaching portion. A holder unit to which the unit is movably mounted along the optical axis direction of the lens, and a cylinder of the lens unit mounting portion for fixing the position of the lens unit in the barrel of the lens unit mounting portion. A lens fixing unit having a fixing screw that is screwed from the outside toward the inside of the barrel, wherein the lens unit mounting portion does not penetrate into the barrel of the lens unit mounting portion along a direction crossing the optical axis direction of the lens. A non-penetrating hole is provided as a mounting hole for screwing in the fixing screw. An intervening portion between the bottom of the non-through hole and the inner surface of the cylinder of the lens unit mounting portion is pressed by the tip of the fixing screw screwed into the non-through hole. It is formed with the thickness which deforms toward the cylinder inner side of the said lens unit mounting part, The lens fixing unit characterized by the above-mentioned.

According to a second aspect of the present invention, in the invention of the first aspect, a conical sharp portion is formed at the tip of the fixing screw.

According to a third aspect of the present invention, in the invention of the first or second aspect, the fixing screw is a self-tapping screw.

According to a fourth aspect of the present invention, in the invention of the first, second, or third aspect, the holder unit is formed by molding a resin material.

According to a fifth aspect of the present invention, there is provided an image capturing device including a lens fixing unit according to any one of the first to fourth aspects, and an image pickup device for receiving the lens-transmitted light of the lens fixing unit. It is a camera apparatus characterized by including the unit.

According to the present invention, when the fixing screw is screwed in, the mounting hole is a non-penetrating hole, so that the tip of the fixing screw is not exposed to the cylinder of the lens unit mounting portion. . That is, the tip of the fixing screw does not directly contact the lens unit mounted in the barrel. Therefore, there is no fear of foreign matters generated by contact, and it can be prevented that adversely affect the photographing result due to scattering of foreign matters generated in the optical path.

According to the present invention, since the mounting hole of the fixing screw is a non-penetrating hole, it can be easily realized by forming processing unlike the case of the through-hole structure. Moreover, when forming a mounting hole, burr etc. do not arise in the inner surface of the cylinder of a lens unit mounting part. In other words, post-processing such as through-hole processing, burr removal, and polishing in a cylinder is not required. Therefore, the manufacturing cost of the holder unit can be reduced as compared with the through hole structure.

1 is an exploded perspective view showing an example of the overall configuration of a camera apparatus of an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing one example of the combination of the front side of the exposure condition switching unit main body in the camera device of FIG.
FIG. 3 is an exploded perspective view showing one example of a combination on the rear side of the exposure condition switching unit main body in the camera device of FIG.
4 is a perspective view showing a schematic configuration of a first specific example of a lens fixing unit according to the present invention.
Fig. 5 is a three sectional view showing a schematic configuration of a first embodiment of a lens fixing unit according to the present invention, (a) is a plan view, (b) is a side view, and (c) is an AA sectional view.
Fig. 6 is a three sectional view showing the structure of the holder unit in the first specific example of the lens fixing unit according to the present invention, where (a) is a plan view, (b) is a side view, and (c) is a BB sectional view.
Fig. 7 is a perspective view showing a schematic configuration of a second embodiment of the lens fixing unit according to the present invention.
Fig. 8 is a three sectional view showing a schematic configuration of a second embodiment of a lens fixing unit according to the present invention, (a) is a plan view, (b) is a side view, and (c) is a CC sectional view.
Fig. 9 is an explanatory diagram showing the structure of the holder unit in the second specific example of the lens fixing unit according to the present invention, (a) is a plan view, (b) is a DD sectional view, and (c) is a perspective view.
Fig. 10 is a side view showing the structure of a fixing screw in the third embodiment of the lens fixing unit according to the present invention.
Fig. 11 is a side view showing the configuration of a modification of the fixing screw of the lens fixing unit according to the present invention and the non-through hole to which the fixing screw is screwed.

Hereinafter, a lens fixing unit and a camera device according to the present invention will be described with reference to the drawings. Here, the whole structure of the camera apparatus comprised using the lens fixing unit is demonstrated first, and then the detailed structure of the lens fixing unit in the said camera apparatus is demonstrated.

<1.Overall configuration of camera device>

The camera device described in this embodiment is used as, for example, a closed-circuit television (CCTV) camera. However, the application of the present invention is not limited to CCTV cameras, but can be similarly applied to notebook cameras, mobile phones, vehicles, and small camera devices used in surveillance equipment other than CCTV cameras.

1 is an exploded perspective view showing an example of the overall configuration of the camera apparatus of the present embodiment, FIG. 2 is an exploded perspective view showing one combination example of the front side of the main body of the exposure condition switching unit in the camera apparatus of FIG. 1 is an exploded perspective view showing a combination example of the rear side of the exposure condition switching unit main body in the camera device of FIG.

As shown in Fig. 1, the camera apparatus described in this embodiment is configured to include the exposure condition switching unit main body 10, the lens fixing unit 20, and the image pickup device unit 30 in large divisions. The lens fixing unit 20 and the image pickup device unit 30 are attached to the exposure condition switching unit main body 10 in a detachable manner, and any one of a plurality of types is selectively attached.

Each of these units 10, 20, and 30 will be described in schematic structure.

(1-1.Schematic Configuration of Exposure Unit Switching Unit)

As shown in FIG. 2, the exposure condition switching unit main body 10 includes a thin hollow housing 101 having an opening 140 for exposure to which external light is incident, and a housing 101. It consists of an exposure condition switching mechanism unit 150 accommodated therein. The lens fixing unit 20 (shown in part in the drawing) is mounted on the front side of the external light incident direction of the housing 101, and is not shown on the rear side of the external light incident direction of the housing 101. The imaging device unit 30 is mounted.

The housing 101 includes a front case 120 (hereinafter referred to as an "top cover") located on the front side in the incident direction of external light, and a rear case (hereinafter referred to as a "bottom base") located on the back side. 110). In addition, the exposure condition switching mechanism unit 150 is accommodated in the space generated by combining the front case 120 and the rear case 110. The rear case 110 is a shallow box-shaped member serving as a base of the unit, and is generally formed in a flat plate shape, and the center portion of the lower surface (outer surface) is formed with a flat surface. . The front case 120 is a flat member that serves as a cover of the unit, and is composed of a flat surface of the entire upper surface (outer surface). After the front case 120 and the rear case 110 accommodate the exposure condition switching mechanism unit 150 therein, the front case 120 is mounted on the pole 112 provided at the edge of the rear case 110. The coupling part 122 installed at the edge portion is engaged to cover the front case 120 on the rear case 110, and in that state, the screw 131 passed through the insertion hole 121 of the front case 120. The front end of the casing is integrally coupled by screwing into the screw hole 111 of the rear case 110, thereby constituting the housing 101.

The exposure condition switching mechanism unit 150 accommodated in the housing 101 is an exposure condition of light incident on the imaging device unit 30 (not shown) from the lens fixing unit 20 through the opening 140 of the housing 101. To switch. Specifically, exposure conditions are switched by removing and inserting an infrared cut filter, which is an example of an optical element, into an optical path formed by, for example, the opening 140. Therefore, the exposure condition switching mechanism part 150 in this embodiment is corresponded to a filter switching mechanism part. However, the exposure condition switching mechanism 150 is not limited to the filter switching mechanism and may be configured to switch the exposure conditions by other optical elements such as an iris or a shutter.

In addition, three screw holes for fixing the lens fixing unit 20 in correspondence with the three insertion holes 123 formed in the front case 120 are formed inside the rear case 110 constituting the housing 101. 113 is provided. Similarly, three screw holes 114 for fixing the imaging device unit 30 are provided in the lower surface of the rear case 110 as shown in FIG.

(1-2.Schematic Configuration of Lens Fixing Unit)

The lens fixing unit 20 supports and fixes a lens disposed on an optical path to the imaging device unit 30 on the front side of the housing 101 of the exposure condition switching unit main body 10 in the external light incident direction. will be. To this end, the lens fixing unit 20 supports the lenses 261 and 271 which focus and image on the optical path to the image pickup device unit 30, as shown in FIG. The lens unit 250A, 250B, and the holder units 200A, 200B mounted on the housing 101 of the exposure condition switching unit main body 10 while supporting the lens units 250A, 250B. It is.

As the lens fixing unit 20, two types of ones can be considered as shown in Fig. 1, and two types of holder units 200A and 200B corresponding to each type of lens units 250A and 250B are provided. In preparation, any one of the holder units 200A and 200B is selected and attached to the exposure condition switching unit main body 10.

The first type lens unit 250A supports the lens 261 by a cylindrical lens frame 260 and connects the holder unit 200A to the lower outer periphery of the lens frame 260. The connection groove part 262 for this is formed.

In addition, the second type lens unit 250B integrally forms the lens frame 270 and the lens 271, and has a male screw part 272 for connecting to the holder unit 200B at the lower end of the lens frame 270. It is formed.

On the other hand, although the holder units 200A and 200B of the first and second types are prepared in accordance with the lens units 250A and 250B, respectively, the mounting structure to the exposure condition switching unit main body 10 is common to all. .

That is, the first type of holder unit 200A includes a lens unit mounting portion 210 formed in a cylindrical shape, and at the lower end of the lens unit mounting portion 210, the housing 101 of the exposure condition switching unit main body 10. ), A flange 215 is provided. The lower end of the lens frame 260 of the first type lens unit 250A is configured to fit snugly into the cylindrical inner 211 of the lens unit attaching part 210. The flange 215 is provided with three screw insertion holes 213 corresponding to the insertion hole 123 of the front case 120 of the housing 101 and the screw hole 113 of the rear case 110. . Then, the screw 216 is passed through the screw insertion hole 213 of the flange 215, and the tip of the screw 216 is passed through the insertion hole 123 of the front case 120. The holder unit 200A is fixed to the front side of the housing 101 of the exposure condition switching unit main body 10 by screwing into the screw hole 113 formed therein. Accordingly, the lens unit 250A corresponding to the holder unit 200A can be fixed to the exposure condition switching unit main body 10 with the holder unit 200A serving as the intermediate member therebetween.

In addition, the second type holder unit 200B includes a lens unit mounting portion 210 formed in a cylindrical shape, and at the lower end of the lens unit mounting portion 210, the housing 101 of the exposure condition switching unit main body 10. Flange 215 is fitted. And inside the cylinder of the lens unit attaching part 210, the female screw part 221 which the male screw part 272 of the lens frame 270 of the 2nd type lens unit 250B screw-fits is provided. The flange 215 is provided with a screw insertion hole 213 in the same manner as the holder unit 200A of the first type, and the holder unit 200B is fixed to the housing 101 using the screw 216. have. Accordingly, the lens unit 250B corresponding to the holder unit 200B can be fixed to the exposure condition switching unit main body 10 with the holder unit 200B serving as the intermediate member interposed therebetween.

In addition, although the case where two types were considered as the lens fixing unit 20 is mentioned here as an example, the kind of the lens fixing unit 20 is not limited to this, of course. That is, the lens fixing unit 20 may be only one type, or may be three or more types.

(1-3.Schematic Configuration of Image Device Unit)

The imaging device unit 30 supports and fixes the imaging device for performing imaging on the back side of the housing 101 in the exposure condition switching unit main body 10 in the external light incident direction. Therefore, the image pickup device unit 30 is a circuit board 350A1, 350A2, 350B in which image pickup devices 370A1, 370A2, 370B, such as a CCD (Charge Coupled Device), are mounted, as shown in FIG. And image pickup device mounting members 300A, 300B mounted on the housing 101 of the exposure condition switching unit main body 10 while supporting the circuit boards 350A1, 350A2, 350B.

By the way, as the imaging device unit 30, three types of things can be considered as shown in FIG. However, since the two types of circuit boards 350A1 and 350A2 can use a common imaging device mounting member 300A, two types of imaging device mounting members 300A and 300B are prepared. Then, any one of the image pickup device mounting members 300A and 300B is selected to be attached to the exposure condition switching unit main body 10.

Both types of circuit boards 350A1, 350A2, and 350B are also mounted with different types of imaging elements 370A1, 370A2, and 370B at substantially central portions on one surface side. Each circuit board 350A1, 350A2, 350B is provided with a screw insertion hole 361, and is fixed to the imaging device mounting members 300A, 300B by screws 362 passed through these screw insertion holes 361. I can do it.

On the other hand, the two types of image pickup device mounting members 300A and 300B have a common connection structure to the exposure condition switching unit main body 10, and are prepared in accordance with the respective circuit boards 350A1, 350A2 and 350B.

That is, either type of image pickup device mounting members 300A and 300B also have a proper portion of the main body portion 310 as shown in FIG. 3 and a screw hole 114 of the rear case 110 of the housing 101. The common screw insertion hole 314 which passes the screw 315 for fastening is provided. Further, when the circuit boards 350A1, 350A2 and 350B are connected to the image pickup device mounting members 300A and 300B, the image pickup devices 370A1, 370A2 and 370B are positioned at positions corresponding to the opening 140 of the housing 101. It is provided with the frame part 312 accommodating so that the intrusion of light from the exterior may be carried out while determining. However, the size, shape, and the like of these frame portions 312 are different for each of the image pickup device mounting members 300A and 300B, and are formed to match the types of the image pickup devices 370A1, 370A2, and 370B, respectively. Further, each of the image pickup device mounting members 300A, 300B is provided with a screw hole 316 for fixing the circuit boards 350A1, 350A2, 350B with the screws 362.

Therefore, the imaging device unit 30 exposes the circuit boards 350A1, 350A2, and 350B corresponding to each of the imaging device mounting members 300A and 300B, with the imaging device mounting members 300A and 300B serving as intermediate members interposed therebetween. It can be fixed to the condition switching unit body (10).

In the imaging device unit 30, as well as in the case of the lens fixing unit 20, the kind is of course not limited to the above example.

<2.Detailed Structure of the Lens Fixing Unit>

Next, a specific example will be given of the lens fixing unit 20 in the camera device having the above-described configuration, and its characteristic configuration will be described in more detail.

As described above, as the lens fixing unit 20, it is possible to consider preparing a plurality of types of the exposure condition switching unit main body 10. Here, two types are described as the first specific example and the second specific example, and each will be described sequentially. In addition, after description of a 1st specific example and a 2nd specific example, a 3rd specific example is demonstrated as a modification.

(2-1.First embodiment example)

In the first embodiment, the lens fixing unit of the second type is described as an example when the overall configuration of the camera apparatus is described.

4 is a perspective view showing a schematic configuration in a first specific example of the lens fixing unit, FIG. 5 is a three side view showing a schematic configuration in a first specific example of the lens fixing unit, and FIG. It is a three side view which shows the structure of the holder unit in a 1st specific example.

The lens fixing unit in the first embodiment includes a lens unit 250B and a holder unit 200B, as shown in FIG. 4 or 5.

The lens unit 250B forms the lens frame 270 and the lens 271 integrally, and forms the male screw part 272 at the lower end of the lens frame 270 for connecting with the holder unit 200B. The male screw portion 272 has a nominal diameter and pitch, for example, M12 × 0.5.

On the other hand, the holder unit 200B includes a lens unit mounting portion 210 formed in a cylindrical shape, and a flange 215 formed at its lower end portion. And the female screw part 221 which the male screw part 272 of the lens frame 270 screws is formed in the cylinder inside of the lens unit mounting part 210. Since the male screw portion 221 is screwed by the male screw portion 272, the diameter and pitch, which are referred to as the male screw portion 272, are, for example, M12 x 0.5.

Therefore, in the lens unit 250B and the holder unit 200B, the male screw portion 272 and the female screw portion 221 are screwed together, whereby the lens unit 250B in the cylinder of the lens unit mounting portion 210 is the lens 271. It is mounted so that a movement along the optical axis direction of is possible. In addition, the term "optical axis direction" as used herein is a direction along the axis of rotation symmetry of the lens 271.

In addition, the holder unit 200B passes the screw 216 through the screw insertion hole 213 of the flange 215, and passes the screw 216 into the rear case 110 of the main body 10 of the exposure condition switching unit. It is fixed to the front side of the housing 101 of the exposure condition switching unit main body 10 by screwing into the screw hole of the said. Therefore, when the holder screw 200B is fixed to the front side of the housing 101 and the turning degree of the male screw 272 with respect to the female screw 221 is adjusted, the lens 271 in the lens unit 250B is adjusted. ) Is adjusted. That is, by finely adjusting the screw engagement state between the male screw portion 272 and the female screw portion 221, the focus of the lens 271 is focused on the image pickup elements 370A1, 370A2, and 370 ° in the image pickup unit 30. Can be adjusted.

However, after performing the focus adjustment of the lens 271, it is necessary to fix it to maintain the state. This is because it is often unnecessary to redo the focusing in applications such as CCTV cameras. This is because if the screw engagement state between the male screw portion 272 and the female screw portion 221 changes after the focus adjustment, and an abnormality occurs in the focus position of the lens 271, good photographing results are not obtained.

Therefore, the lens fixing unit 20 is provided with the fixing screw 290 in addition to the lens unit 250B and the holder unit 200B. The fixing screw 290 is screwed from the outside of the cylinder of the lens unit mounting portion 210 toward the inside of the cylinder because of the position fixing of the lens unit 250B in the cylinder of the lens unit mounting portion 210.

The lens unit mounting portion 210 of the holder unit 200B is provided with a mounting hole for screwing the fixing screw 290 from the outside of the cylinder in the cylinder along the direction crossing the optical axis direction of the lens 271. It is. However, this mounting hole is a non-through hole 231 which does not penetrate into the cylinder of the lens unit mounting part 210 as shown in FIG.

Since the mounting hole of the fixing screw 290 is the non-penetrating hole 231, in the lens unit mounting portion 210, the bottom surface of the non-through hole 231 and the inner surface of the cylinder of the lens unit mounting portion 210 (ie, the arm). Between the threaded portion of the threaded portion 221, a thin interposed portion 232 is present. The interposition portion 232 has a thickness that deforms toward the inside of the cylinder of the lens unit mounting portion 210 when the interposition portion 232 is pressed to the distal end of the fixing screw 290 screwed to the non-through hole 231. It is formed. That is, the depth of formation of the non-penetrating hole 231 with respect to the thickness of the cylinder of the lens unit mounting part 210 is set so that the thickness of this interposition part 232 may be set.

Moreover, in order to ensure the depth sufficient for screwing of the fixing screw 290 as the formation depth of the said non-penetrating hole 231 in the formation part of the non-penetrating hole 231 in the lens unit mounting part 210, the said lens It may be considered to form a convex portion 233 protruding from the cylindrical outer circumferential surface of the unit mounting portion 210 toward the outside of the cylinder.

In the lens fixing unit 20 having the above-described configuration, when the fixing screw 290 is screwed into the non-through hole 231, the interposition portion 232 is pressed by the screwing, and the lens unit mounting portion 210 is screwed. The inner surface of the barrel, that is, the threaded portion of the female threaded portion 221 deforms toward the inside of the cylinder. As a result, the male threaded portion 272 of the lens unit 250B in the screwed state with the female threaded portion 221 is limited in rotation in the female threaded portion 221, and as a result, in the female threaded portion 221 The position of is fixed. That is, the position of the lens unit 250B in the cylinder of the lens unit mounting portion 210 is fixed by screwing the fixing screw 290 into the non-through hole 231.

At this time, since the fixing screw 290 is screwed into the non-penetrating hole 231, the tip of the fixing screw 290 is formed by the presence of the thin interposed portion 232. It is not exposed into the cylinder of. That is, the tip of the fixing screw 290 does not directly contact the male screw portion 272 of the lens unit 250B mounted in the lens unit mounting portion 210. Therefore, even when screwing the fixing screw 290, there is no fear of foreign matters generated by the contact of the tip of the fixing screw 290 and the male screw portion 272. If there is no fear of foreign matters, the foreign matters are not scattered into the optical path, and as a result, the foreign matters can be prevented from adversely affecting the photographing result in the imaging device unit 30. have.

In addition, unlike the case of through-hole structure, with respect to the holder unit 200B provided with the non-through hole 231, it becomes easy to manufacture the said holder unit 200B by shaping | molding process. In other words, the through-hole structure is easy to be manufactured by the forming process as long as the through-hole structure is difficult to produce by the forming process. Moreover, in the holder unit 200B provided with the non-through hole 231, a burr etc. do not generate | occur | produce in the cylindrical inner surface of the lens unit mounting part 210 when forming the said non-penetrating hole 231. FIG. In other words, post-processing such as through-hole processing, burr removal, and female thread grinding in the cylinder is not required. As a result, the holder unit 200B of the non-through hole structure can easily realize a reduction in manufacturing cost as compared with the case of the through-hole structure.

Such a holder unit 200B may be formed by molding a resin material such as extrusion molding or injection molding. This is because the non-through hole structure is a structure suitable for forming processing unlike the through hole structure.

In addition, when the resin material is used, the interposition portion 232 of the lens unit mounting portion 210 can be easily and reliably deformed as compared with the case where other materials such as metal are used. That is, compared with the case where other materials, such as metal, are used, it is necessary to manage the formation dimension with respect to the cylinder thickness of the lens unit mounting part 210, the depth of the non-through hole 231, the thickness of the interposition part 232, etc. with high precision. There is no. Therefore, the manufacturing cost of the holder unit 200B can be reduced by lowering the formed dimensions.

However, the holder unit in the present invention is not limited to a molded article of a resin material, and may be a die cast molded article made of a metal material. Moreover, what is formed through cutting processing etc. other than a shaping process may be formed. Moreover, also when forming using a resin material, the kind of resin material is not specifically limited.

As the fixing screw 290 screwed to the lens unit mounting portion 210 of the holder unit 200B, a self-tapping screw may be used. The "self-tapping screw" is a screw of the type which tightens while screwing a thread by the screw itself in the place where a thread does not exist. More specifically, the screw is screwed into the hole (tab hole, boss) which is smaller than the outer diameter of the screw and has no thread or the auxiliary thread for forming the thread. As well as screws with self-tapping (fastening), they generally mean mechanisms similar to these screws. Specifically, what includes the screw part of the shape prescribed | regulated by JIS (Japanese Industrial Standard) B1007 is mentioned.

When such a self-tapping screw is used as the fixing screw 290, it is not necessary to form a thread in advance in the non-through hole 231 to which the said fixing screw 290 is screwed. Therefore, the manufacturing cost of the holder unit 200B can be reduced as compared with the case where the screw thread is formed in advance. In addition, since it is not necessary to form a screw thread beforehand, it becomes suitable when it applies to the case where the said holder unit 200A is manufactured by shaping | molding process.

The self-tapping screw as the fixing screw 290 is very suitable for use when the holder unit 200B is made of a resin material. However, the fixing screw in this invention is not limited to the self-tapping screw, For example, when the holder unit 200B consists of a metal material, the screw which needs to form a screw thread beforehand is used as the fixing screw 290. It may also be considered to use. Moreover, it is preferable that the fixing screw 290 itself is formed of a metal material from a viewpoint of securing strength.

(2-2. Second embodiment example)

Subsequently, a second specific example will be described. In addition, about the matter which does not have a special description in 2nd specific example, it shall be the same as that of the 1st specific example.

In the first embodiment, the lens fixing unit corresponding to the lens unit having the small diameter of the screwing method has been described. On the other hand, in the second embodiment, as a type different from the first embodiment, the lens fixing unit corresponding to the lens unit having a large diameter of the screwing method is taken as an example.

Fig. 7 is a perspective view showing a schematic configuration in a second embodiment of the lens fixing unit, Fig. 8 is a three side view showing a schematic configuration in a second embodiment of the lens fixing unit, and Fig. 9 is a view of the lens fixing unit. It is explanatory drawing which shows the structure of the holder unit in a 2nd specific example.

In the second embodiment, the lens fixing unit includes a lens unit 250C and a holder unit 200C, as shown in Fig. 7 or 8.

The lens unit 250C includes a lens 281, a lens frame 280 that supports it, and a male screw 282 formed at the lower end of the lens frame 280. All of these are formed in large diameter compared with the case of 1st specific example. Specifically, the male screw portion 282 in the second concrete example has an inner diameter of 25.4, whereas the diameter and pitch of the male screw portion 272 in the first specific example are, for example, M12 × 0.5. It is a state that it respond | corresponds to what is called the C mount standard of mm (1 inch) and pitch 0.794 mm (32 threads / inch).

On the other hand, the holder unit 200C includes a lens unit mounting portion 240 formed in a cylindrical shape and a flange 245 formed at its lower end portion. In the holder unit 200B according to the first embodiment, however, the flange 215 is formed in a convex cross section in which the flange 215 projects outward from the cylindrical outer periphery of the lens unit mounting portion 210. On the other hand, since the holder unit 200C in the second specific example corresponds to the lens unit 250C having a large diameter, a cross section in which the flange 245 protrudes to the cylindrical inner circumferential side of the lens unit mounting portion 240. It is formed in concave shape. And inside the cylinder of the lens unit attaching part 240, the female screw part 241 which the male screw part 282 of the lens frame 280 screws is formed. Since the male threaded portion 241 is screwed by the male threaded portion 282, a C mount standard having an internal diameter of 25.4 mm (1 inch) and a pitch of 0.794 mm (32 threads / inch), for example, is similar to the male threaded portion 282. It is supposed to correspond to. The formation pitch of the screw insertion hole 213 formed in the flange 245 and the like correspond to the housing 101 of the exposure condition switching unit main body 10 as in the first embodiment.

Therefore, also in the second embodiment, the male screw portion 282 and the female screw portion 241 are screwed together, so that the lens unit 250C has a lens 281 within the cylinder of the lens unit mounting portion 240 in the holder unit 200C. Is mounted to be movable along the optical axis direction.

In addition, the lens fixing unit 20 is provided with the fixing screw 290 in addition to the lens unit 250C and the holder unit 200C.

In the lens unit mounting portion 240 of the holder unit 200C, as shown in Fig. 9, the lens unit mounting portion 240 faces from the outside of the cylinder into the cylinder along the direction intersecting with the optical axis direction of the lens 281, and As a mounting hole for screwing, a non-through hole 231 that does not penetrate into the cylinder of the lens unit mounting portion 240 is provided.

Since the non-through hole 231 is provided, in the lens unit mounting portion 240, the bottom portion of the non-through hole 231 and the inner surface of the cylinder of the lens unit mounting portion 240 (that is, the female screw portion 241). Between the threaded portion), there is a thin interposed portion 232. The interposition portion 232 is formed to have a flesh thickness that deforms toward the inside of the cylinder of the lens unit mounting portion 240 when pressed by the tip of the fixing screw 290 screwed into the non-through hole 231. do. That is, the depth of formation of the non-penetrating hole 231 with respect to the thickness of the barrel of the lens unit mounting part 240 is set so that the thickness of this interposition part 232 may be set.

Since the diameter of the lens unit 250C is large, the non-through hole 231 may be provided in a plurality of portions of the lens unit attaching part 240. As a some part, two places where the cylindrical columnar shape of the lens unit mounting part 240 opposes are mentioned. However, the number of the non-through holes 231, the installation place, and the like are not particularly limited, and may be appropriately set in consideration of the size of the lens unit 250C, the holder unit 200C, and the like.

In the formation portion of the non-through hole 231, it is conceivable to form the convex portion 233 in the same manner as in the first embodiment.

In the lens fixing unit 20 having the above-described configuration, when the fixing screw 290 is screwed into the non-through hole 231, the interposition portion 232 is pressed by the screwing, and the lens unit mounting portion 240 is provided. The inner surface of the barrel, that is, the threaded portion of the female threaded portion 241 deforms toward the inside of the cylinder. As a result, the position of the lens unit 250C in the cylinder of the lens unit attaching part 240 is fixed.

At this time, since the fixing screw 290 is screwed into the non-through hole 231, the tip of the fixing screw 290 with respect to the male screw portion 282 of the lens unit 250C mounted in the lens unit attaching portion 240. There is no direct contact. Therefore, there is no fear of foreign matter generation due to contact between the tip of the fixing screw 290 and the male screw portion 282 of the lens unit 250C.

Moreover, since the mounting hole of the fixing screw 290 is the non-penetrating hole 231, it is easy to manufacture the holder unit 200C by shaping | molding process, and also the through-hole process and burr in manufacture of the holder unit 200C. No post-processing is required, such as removal) and polishing of the female thread in the cylinder, and the manufacturing cost of the holder unit 200C can be easily reduced as compared with the through-hole structure.

(2-3. Third embodiment example)

Subsequently, a third specific example will be described. In addition, about the matter which does not have a special description in 3rd specific example, it shall be the same as that of the 1st specific example or the 2nd specific example.

In the third embodiment, the shape of the fixing screw screwed into the non-through hole is different from that of the first embodiment or the second embodiment.

Fig. 10 is a side view showing the structure of the fixing screw in the third embodiment of the lens fixing unit.

As shown in the illustrated example, the fixing screw 291 in the third embodiment has a conical sharp portion 292 formed at the tip of the fixing screw 291. have. The sharp part 292 is not particularly limited as long as it is a conical pointed shape toward the distal end side of the fixing screw 291 (that is, the side of the bottom face of the non-through hole 231). However, it is preferable that the shaft center of the screw body part and the conical part coincide.

In the case where the fixing screw 291 is a self-tapping screw, for example, the screw portion has a shape called "tapping screw type F flat end" defined in JIS B 1007, specifically, FIG. 10. As shown in (a), if the cross section 293 of the screw portion is flat and has a taper tapering toward the end, the tapered portion has a parallel thread extension. 292 may be formed to protrude from the end face 293 of the screw portion. However, for example, the screw portion has a shape called "tapping screw type C cone end", which is defined in JIS B 1007. Specifically, as shown in Fig. 10 (b), the screw portion is about 45 degrees. As long as there is a thread to the vicinity of the tip end of the attachment provided with the pointed tip of the figure, the attachment may be used as the sharp part 292 as it is.

In the case of using the fixing screw 291 having the above-described configuration, when the fixing screw 291 is screwed into the non-through hole 231, the sharp portion 292 of the fixing screw 291 is It functions as a guide (guide) for screw insertion. Therefore, as compared with the case where the sharp portion 292 is not formed, the screwing of the fixing screw 291 to the non-through hole 231 can be easily performed.

If the fixing screw 291 is screwed into the non-penetrating hole 231, the sharp part 292 in the fixing screw 291 reaches the bottom surface of the non-penetrating hole 231. At this time, the top part of the sharp part 292 makes point contact with the said bottom face. Therefore, when the fixing screw 291 presses the interposition portion 232 toward the inner side of the cylinder, the pressing force can be concentrated on one point where the pressing force is in point contact. When the force for pressure deformation is concentrated at one point, the pressure of the force acting is increased as compared with the case where it is not concentrated. Therefore, when the fixing screw 291 in which the sharp part 292 is formed is used, the interposition part 232 can be easily deformed compared with the case where the sharp part 292 is not formed. That is, compared with the case where there is no sharp part 292, it becomes possible to tighten the fixing screw 291 easily and easily by small force. Moreover, since the interposition part 232 can be easily deformed, the position of the lens unit 250B with respect to the lens unit mounting part 210 can be fixed reliably by small force.

(2-4.Others)

In the first to third specific examples described above, preferred specific embodiments of the lens fixing unit according to the present invention have been described, but the present invention is not limited thereto.

In the first to third specific examples, the case where the lens unit is mounted in the barrel of the lens unit mounting portion by screwing the male screw portion and the female screw portion has been exemplified. However, for example, the entire structure of the camera device will be described. Like type 1, even if it is not a screwing but a tight fitting, it can be considered to perform the position fixing of the lens unit by using the screwing of the fixing screw to the non-through hole.

In the first to third specific examples, the case where the lens unit mounting portion is formed in a cylindrical shape has been exemplified. However, if the lens unit can be mounted to be movable in the cylinder, the lens unit mounting portion may have a cylindrical shape (eg For example, it may be formed in a columnar shape.

In addition, although the specific numerical value was mentioned about the nominal diameter and pitch which the male screw part and the male screw part call in the 1st and 2nd specific example, it cannot be overemphasized that this invention is not limited to this.

In addition, although the fixing screw in which the sharp part was formed was mentioned as the example in 3rd specific example, this invention is not limited to this.

Fig. 11 is a side view showing a modification of the fixing screw and the non-through hole to which the fixing screw is screwed.

For example, as shown in Fig. 11A, the fixing screw 295 and the non-through hole 231 to which it is screwed are convex on at least one of them (both in the illustrated example) facing each other. The protrusions 234 and 296 protruding from each other may be provided. Also in this structure, although it is not about the case of the sharp part 292 in 3rd specific example, since the contact area of the front end of the fixing screw 295 and the bottom face of the non-through hole 231 is suppressed, the protrusion part 234 296, the interposition portion 232 can be easily deformed as compared with the case where there is no.

In addition, with respect to the bottom shape of the non-through hole 231, the thickness of the interposition part 232 specified by the said bottom shape does not necessarily need to be the same. For example, as shown in Figs. 11 (b) to 11 (d), the bottom portion of the non-through hole 231 is formed such that the intervening portion 232 has a weak portion 235 which is partially thin. Can be considered In this case, since the weak portion 235 is present, the interposition portion 232 can be easily deformed. In addition, unlike the case where the thickness of the entirety of the intervening portion 232 is made thin, there is little concern about exposing the tip of the screw due to breakage of the interposing portion 232. The non-through hole 231 in which the weakened portion 235 is provided may be screwed to any of the fixing screws 290, 291, and 295.

Thus, the fixing screw and the non-through hole to which the fixing screw is screwed are not limited to the specific examples described above, and the shape thereof can be appropriately changed. More specifically, the tip shape of the fixing screw and the bottom shape of the non-penetrating hole allow various shapes and combinations to be set in various ways while taking into consideration the forming material of the fixing screw or the holder unit in which the non-penetrating hole is formed. Can be considered

The above-mentioned various modifications can be said to be exactly the same with respect to the camera fixing apparatus provided with the said lens fixing unit as well as the lens fixing unit demonstrated by the 1st-3rd specific example.

That is, the present invention is not limited to the specific embodiments described above with respect to any of the lens fixing unit and the camera device, and can be changed as appropriate without departing from the gist of the present invention.

10... Exposure Condition Switching Unit Main Unit
20... Lens fixing unit
30 ... Imaging element unit
200 A, 200 B, 200 C... Holder unit
210, 240... Lens unit mounting part
231 ... Non-penetrating hole
232 ... Intervention Department
250A, 250B, 250C... Lens unit
261, 271, 281... lens
290, 291, 295... Fixing screw
292... A sharp art department

Claims (5)

A lens unit having a lens,
A holder having a lens unit mounting portion formed in a cylindrical shape, wherein the lens unit is mounted in the cylinder of the lens unit mounting portion so as to be movable along the optical axis direction of the lens. Holder unit,
A lens fixing unit comprising a fixing screw which is screwed from the outside of the barrel of the lens unit mounting portion toward the inside of the barrel for fixing the position of the lens unit in the barrel of the lens unit mounting portion,
The lens unit mounting portion is provided with a non-penetrating hole which does not penetrate into the cylinder of the lens unit mounting portion along a direction crossing the optical axis direction of the lens as a mounting hole for screwing the fixing screw. ,
An intervening portion between the bottom of the non-penetrating hole and the inner surface of the tube of the lens unit mounting portion is pressed by the tip of the fixing screw screwed into the non-penetrating hole. To form a thickness that deforms toward the inside of the barrel of the lens unit mounting portion.
Lens fixing unit characterized in that.
The method of claim 1,
A lens fixing unit, characterized in that a cone-shaped sharp portion is formed at the tip of the fixing screw.
The method according to claim 1 or 2,
The fixing screw is a lens fixing unit, characterized in that the self-tapping screw.
3. The method according to claim 1 or 2 ,
And the holder unit is formed by molding a resin material.
The lens fixing unit of claim 1 ,
Imaging element unit provided with an imaging element which receives the lens transmission light of the said lens fixing unit.
Camera apparatus characterized in that configured to include.

Images