JP2016006456A - Camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera device capable of easily adjusting an optic axis of an imaging lens and a central position of an imaging sensor.SOLUTION: A camera device 10 comprises a camera device body 2 and an attachment part 11 for attaching an imaging lens 1 to the camera device body 2. The attachment part 11 includes: a base part 3 disposed on the camera device body 2 and formed from a cylindrical member; a holder part 4 fixed to one end of the imaging lens 1, contacting the base part 3, and capable of moving in a direction orthogonal to an optic axis C of the imaging lens 1; and a stopper part 5 formed of a cylindrical member capable of being screwed to the base part 3, being screwed to the base part 3 sandwiching the holder part 4 between itself and the base part 3, for fixing the holder part 4 to the base part 3.

Description

  The present invention relates to a camera apparatus using a screw mount system such as a C mount or a CS mount.

  In recent years, surveillance cameras have been installed in various places such as stores, banks, streets, and parking lots, both indoors and outdoors. A screw mount type surveillance camera such as a C mount or CS mount is versatile and convenient because a user can select a photographing lens suitable for the angle of view and distance that the user wants to photograph and attach it to the surveillance camera body.

  However, it is known that these screw mount type surveillance cameras cause a deviation between the optical axis of the imaging lens attached to the surveillance camera body and the imaging center of the imaging sensor held inside the surveillance camera body. Yes. And the technique which mounts the adjustment mechanism which correct | amends this deviation | shift on the surveillance camera is proposed (refer patent document 1).

  Japanese Patent Laid-Open No. 2004-133830 adjusts the shift between the center of the imaging lens and the imaging center of the imaging sensor by adjusting the position of the mount frame fixed to the camera body with respect to the lens holding frame that holds the imaging lens. Is described. Here, four locations in the circumferential direction of the mount frame around the optical axis are supported by shift screws, and the position of the mount frame is orthogonal to the optical axis by adjusting the tightening of the four shift screws. Can be adjusted and fixed.

Japanese Patent Laid-Open No. 10-115757

  As described above, in the screw mount system such as the C mount and the CS mount, the center of the screw part to which the photographing lens of the surveillance camera body is screwed and the imaging center of the imaging sensor depend on the component accuracy and the assembly accuracy. There is almost no match. In addition, the optical axis of the photographing lens and the central axis of the screw portion of the monitoring camera body do not necessarily coincide with each other due to the influence of screwing between the screw portion of the photographing lens and the screw portion of the monitoring camera body.

  If there is a deviation between the optical axis of the imaging lens and the imaging center of the imaging sensor, there is a problem that vignetting occurs particularly when a wide-angle imaging lens having a wide imaging angle of view is selected as the imaging lens. .

  On the other hand, in the adjustment method of Patent Document 1 described above, the work is complicated to adjust the tightening of shift screws provided at four locations in the circumferential direction of the mount frame with the optical axis as the center, and further, adjustment is required. A predetermined space is required for laying out a plurality of shift screws and the like.

  SUMMARY An advantage of some aspects of the invention is that it provides a camera device that can easily adjust the optical axis of a photographing lens and the center position of an imaging sensor.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, in the camera device including a camera device main body and an attachment portion for attaching a photographing lens to the camera device main body, the attachment portion is: A base part made up of a cylindrical member provided in the camera device body and a member fixed to one end of the photographic lens, abutting on the base part and movable in a direction perpendicular to the optical axis of the photographic lens A holder part and a stopper part for fixing the holder part to the base part by screwing the holder part with the holder part sandwiched between the holder part and the base part. It is characterized by providing.

  According to the present invention, it is possible to easily adjust the optical axis of the photographing lens and the center position of the imaging sensor.

1 is an external perspective view showing an overall configuration of a camera device according to an embodiment of the present invention. It is a disassembled perspective view at the time of disassembling the camera apparatus which concerns on one embodiment of this invention. It is sectional drawing at the time of cut | disconnecting a camera apparatus along the AA line of FIG. 1, and seeing in the arrow direction. It is sectional drawing when a camera apparatus is cut | disconnected along the BB line of FIG. 3, and it sees in the arrow direction, It is sectional drawing before adjustment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 after loosening the screwing of the stopper portion to the base portion and viewed in the arrow direction. It is sectional drawing when a camera apparatus is cut | disconnected along the BB line of FIG. 3, and it sees in the arrow direction, It is sectional drawing after adjustment.

  Hereinafter, an example of a camera device according to an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following examples.

<Configuration of the entire camera device>
FIG. 1 is an external perspective view showing the overall configuration of a camera apparatus according to an embodiment of the present invention. FIG. 2 is an exploded perspective view when the camera apparatus according to the embodiment of the present invention is disassembled. FIG. 3 is a cross-sectional view of the camera device taken along the line AA in FIG. 1 and viewed in the direction of the arrow. The camera device 10 in this embodiment is a surveillance camera mainly used for crime prevention, measurement, and the like.

  As shown in FIGS. 1 and 2, the camera device 10 of the present embodiment includes a camera device body 2, a photographing lens 1 attached to the camera device body 2, and attachment for attaching the photographing lens 1 to the camera device body 2. Part 11.

  As shown in FIG. 3, the camera device main body 2 includes a housing 9 provided with an incident window 9 a into which light guided from the photographing lens 1 is incident, and a substrate that is housed in the housing 9 and has an image sensor 7. 8. In addition, although not shown, a control unit, a power supply unit, and the like are provided inside the housing 9. The imaging sensor 7 is disposed in the housing 9 so that the optical axis C of the photographing lens 1 attached to the incident window 9a side substantially coincides with the photographing center O of the imaging surface.

  Note that, in terms of design, the imaging center O of the imaging surface of the imaging sensor 7 and the optical axis C of the imaging lens 1 are configured to coincide with each other, but as described above, the imaging center depends on the component accuracy and assembly accuracy. O and the optical axis C rarely coincide. In the present embodiment, when the camera apparatus 10 is assembled, adjustment is performed so that the optical axis C of the photographing lens 1 and the photographing center O of the imaging sensor 7 coincide. This adjustment method will be described later.

  The photographic lens 1 is composed of a desired optical system, and guides incident light to the imaging sensor 7 of the camera device body 2 and forms an image on the imaging surface of the imaging sensor 7. On the outer peripheral surface of the photographic lens 1 on the camera device body 2 side, a male screw portion 1a that is screwed into a holder portion 4 described later is provided. When the photographic lens 1 is attached to the camera device body 2, the photographic lens 1 is fixed to the holder portion 4.

  The attachment portion 11 includes a base portion 3, a holder portion 4, a washer 6, and a stopper portion 5 that are arranged in this order from the camera device body 2 side toward the photographing lens 1 side. The attachment portion 11 is configured in a cylindrical shape in order to guide the light incident from the photographing lens 1 to the camera device body 2 side.

  The base unit 3 is formed of a cylindrical member having the imaging center O of the imaging sensor 7 provided in the camera device body 2 as a central axis, and is formed integrally with the camera device body 2 on the lens mounting side of the camera device body 2. ing. On the inner peripheral surface of the base portion 3, there are a female screw portion 3a that can be screwed with a male screw portion 5c of a stopper portion 5 described later, and a reduced diameter portion 3b that is provided closer to the camera device body 2 than the female screw portion 3a. Is formed. The female screw portion 3a is provided so that the photographing center O of the image sensor 7 is the central axis.

  The reduced diameter portion 3b is provided so as to reduce the inner diameter of the base portion 3 on the camera device main body 2 side rather than the inner diameter at the position where the female screw portion 3a of the base portion 3 is formed. The reduced diameter portion 3 b has a flat surface portion 3 c configured by a plane orthogonal to the optical axis C of the photographing lens 1. The flat surface portion 3c becomes a surface with which a flange portion 4b of the holder portion 4 described later comes into contact when the mounting portion 11 is assembled.

  The holder portion 4 projects in the radial direction of the holder ring 4c over the entire circumference of the holder ring 4c formed of a cylindrical member having an internal thread portion 4a on the inner peripheral surface and the outer peripheral surface of the holder ring 4c. The flange portion 4b is provided. The female thread 1a of the photographic lens 1 is screwed into the female thread 4a of the holder ring 4c. At least the surface of the flange portion 4b on the camera device body 2 side is formed as a surface perpendicular to the central axis of the holder ring 4c.

  Further, in the holder part 4, the outer diameter of the part located closer to the camera device body 2 than the flange part 4b of the holder ring 4c is smaller than the inner diameter of the reduced diameter part 3b of the base part 3, and the outer diameter of the flange part 4b is smaller. It is comprised so that it may become smaller than the internal diameter in the part in which the internal thread part 3a of the base part 3 is formed. The holder portion 4 is inserted into the reduced diameter portion 3b of the base portion 3 at the portion of the holder ring 4c that is located closer to the camera device body 2 than the flange portion 4b when the photographing lens 1 is attached to the camera device body 2. The surface of the flange portion 4b on the camera device main body 2 side is disposed so as to contact the flat surface portion 3c of the base portion 3.

  Further, the holder portion 4 is configured such that when the photographing lens 1 is attached to the camera device main body 2, the outer peripheral surface of the portion located on the camera device main body 2 side relative to the flange portion 4 b and the inner periphery of the reduced diameter portion 3 b of the base portion 3. A predetermined gap S1 is formed between the surface and the surface. Similarly, the holder portion 4 has a predetermined gap between the outer peripheral end surface of the flange portion 4b and the inner peripheral surface of the portion where the female screw portion 3a of the base portion 3 is formed when the photographing lens 1 is attached to the camera apparatus body 2. A gap S2 is formed. Here, it is assumed that the gap S1 is sufficiently larger than the gap S2. In the present embodiment, the size of the gap S2 is an adjustable width when adjusting the mounting position of the photographic lens 1 described later. A method for adjusting the mounting position of the photographic lens 1 will be described later.

  The washer (washer) 6 has an outer diameter that is substantially the same as the outer diameter of the flange portion 4 b of the holder portion 4, and the inner diameter thereof is the outer diameter of the holder ring 4 c closer to the photographing lens 1 than the flange portion 4 b of the holder portion 4. It is comprised with the larger hollow disk member. In the present embodiment, the washer 6 is a so-called flat washer having a flat surface. The washer 6 is held between the stopper portion 5 and the holder portion 4 when the photographing lens 1 is attached.

  The stopper portion 5 is provided at a stopper ring 5a formed of a cylindrical member and one end of the stopper ring 5a, and extends in the radial direction of the stopper ring 5a over the entire outer periphery of the stopper ring 5a. And a flange portion 5b provided to project. The inner diameter of the stopper ring 5a is such that the end of the photographic lens 1 on the camera device body 2 side can be inserted. A male screw portion 5c that engages with a female screw portion 3a provided on the inner peripheral surface of the base portion 3 is provided on the outer peripheral surface of the end of the stopper ring 5a opposite to the side on which the flange portion 5b is provided. The end surface of the stopper ring 5a on the side where the male screw portion 5c is provided comes into contact with the washer 6 when the photographic lens 1 is attached to the camera apparatus body 2.

  The stopper portion 5 is moved to the camera device main body 2 side by being screwed into the base portion 3 and rotated in one direction. Thus, the stopper portion 5 can fix the holder portion 4 to the base portion 3 by sandwiching the flange portion 4b and the washer 6 of the holder portion 4 between the flat portion 3c of the base portion 3. Since the photographic lens 1 can be fixed to the holder portion 4, the photographic lens 1 can be fixed to the camera apparatus body 2 by fixing the holder portion 4 to the base portion 3 by the stopper portion 5.

<How to attach and adjust the photographic lens>
Next, a method for attaching the photographing lens 1 to the camera device body 2 and a method for adjusting the attachment position of the photographing lens 1 will be described. When attaching the photographic lens 1 to the camera device body 2, first, the end of the photographic lens 1 on the side where the male screw portion 1 a is formed is passed through the stopper portion 5 and the washer 6 in this order. Thereafter, the male screw portion 1a of the photographing lens 1 and the female screw portion 4a of the holder portion 4 are screwed together to fix the photographing lens 1 and the holder portion 4. Next, the side on which the holder part 4 of the photographing lens 1 is fixed is inserted into the base part 3 provided in the camera apparatus body 2, and the flange part 4 b of the holder part 4 is provided with the flat part 3 c provided on the base part 3. Abut. In this state, the male screw part 5 c of the stopper part 5 is screwed into the female screw part 3 a of the base part 3.

  When the inner diameter of the stopper portion 5 and the washer 6 is larger than the outer diameter on the light incident side of the photographing lens 1, the holder portion 4 is fixed to the photographing lens 1 and then the washer 6 from the light incident side of the photographing lens 1. The stopper portion 5 may be inserted into the base portion 3 by inserting the stopper portion 5 in order.

  By rotating the stopper portion 5 while screwing the male screw portion 5c of the stopper portion 5 into the female screw portion 3a of the base portion 3, the stopper portion 5 is moved to the camera device body 2 side. Then, after the end surface of the stopper unit 5 on the camera device main body 2 side abuts against the flange portion 4b of the holder unit 4 via the washer 6, the stopper unit 5 is further tightened against the base unit 3 so that the stopper unit 5 is tightened. Is fixed to the base 3. Thereby, the holder part 4 to which the photographing lens 1 is fixed is fixed between the base part 3 and the stopper part 5, and the attachment of the camera device body 2 of the photographing lens 1 is completed.

  Next, a method for adjusting the mounting position of the taking lens 1 will be described. As described above, the imaging center O of the imaging surface of the imaging sensor 7 and the optical axis C of the imaging lens 1 coincide with each other in design, but the imaging center O and the light depend on the component accuracy and assembly accuracy. The axis C is rarely coincident. FIG. 4 is a cross-sectional view of the camera device 10 when the camera device 10 is cut along a line BB in FIG. 3 and viewed in the direction of the arrow, and the optical axis C and the imaging center O do not coincide with each other. It is sectional drawing before adjustment.

  Before adjusting the position of the photographic lens 1, the optical axis C of the photographic lens 1 and the imaging center O of the imaging sensor 7 are shifted as shown in FIG. This deviation is approximately 0.05 mm to 0.20 mm, although it depends on the component accuracy and assembly accuracy.

  In order to correct such a deviation between the optical axis C of the photographing lens 1 and the photographing center O of the imaging sensor 7 so that the optical axis C of the photographing lens 1 and the photographing center O of the imaging sensor 7 coincide, Rotate 5 in the loosening direction. FIG. 5 is a cross-sectional view of the camera device 10 taken along the line AA in FIG. 1 after loosening the screwing of the stopper portion 5 to the base portion 3 and viewed in the direction of the arrow. As shown in FIG. 5, the amount of loosening of the stopper portion 5 is such that the flange portion 4 b of the holder portion 4 is not separated from the flat portion 3 c of the base portion 3, and the flat surface of the holder portion 4 is the flat portion of the base portion 3. It is a grade which can move while sliding on 3c.

  Next, the position of the holder unit 4 is moved in a direction perpendicular to the optical axis C of the photographing lens 1 while viewing the image photographed by the camera device 10 and projected by an image device (not shown). The optical axis C of 1 and the imaging center O of the imaging sensor 7 are aligned. The movable width of the holder part 4 is within the range of a gap S2 formed between the female thread part 3a of the base part 3 and the outer peripheral surface of the flange part 4b of the holder part 4, that is, the outer peripheral end of the flange part 4b and the base This is the distance between the inner peripheral surface of the part 3.

  Note that the holder portion 4 can be moved within the range of the gap S <b> 2 and can be moved until the outer peripheral surface of the flange portion 4 b comes into contact with the female screw portion 3 a of the base portion 3. Therefore, by further reducing the outer diameter of the flange portion 4b with respect to the inner diameter of the female screw portion 3a of the base portion 3, the range of the clearance S2 can be widened and the movable width of the holder portion 4 can be increased. The movable width of the holder portion 4 may be any width that can correct the maximum deviation width due to the site accuracy and assembly accuracy.

  Further, by making the gap S1 shown in FIG. 3 sufficiently larger than the gap S2, the outer peripheral surface of the holder ring 4c does not come into contact with the inner diameter of the reduced diameter portion 3b of the base portion 3, so that the reduced diameter portion 3b. Therefore, the movement of the holder part 4 is not limited.

  And in this embodiment, the stopper part 5 is loosened to such an extent that the flange part 4b of the holder part 4 does not leave | separate from the plane part 3c of the base part 3 via the washer 6. FIG. For this reason, the holder part 4 does not move so much in the direction parallel to the optical axis C of the photographing lens 1, and slides on the flat part 3 c of the base part 3 mainly in a direction orthogonal to the optical axis C. Thereby, the user can adjust the holder part 4 stably.

  FIG. 6 is a cross-sectional view of the camera apparatus 10 when the camera apparatus 10 is cut along a line BB in FIG. 3 and viewed in the direction of the arrow, and is a cross-sectional view after adjustment. As shown in FIG. 5, the stopper portion 5 is rotated in a direction approaching the holder portion 4 at a position where the optical axis C of the photographing lens 1 coincides with the imaging center O of the imaging sensor 7, and the stopper portion 5 is moved to the base portion 3. Tighten against. Thereby, the position of the holder part 4 and the base part 3 can be fixed at the position where the optical axis C of the photographing lens 1 and the imaging center O of the imaging sensor 7 coincide.

  And in this embodiment, when the taking lens 1 is attached to the camera apparatus main body 2, the holder part 4 is hold | maintained at the inner peripheral side of the base part 3, and the holder part 4 is not exposed outside as shown in FIG. . Thereby, after fixing the photographic lens 1 to the camera apparatus main body 2, the attachment position of the photographic lens 1 can be maintained stably.

  Thus, in the camera device 10 of the present embodiment, the holder portion 4 can be freely moved within the range of the gap S2 in a state where the tightening of the stopper portion 5 with respect to the base portion 3 is loosened. Therefore, the camera device 10 according to the present embodiment can easily adjust the mounting position of the photographing lens 1 as compared with the configuration in which the position of the photographing lens 1 is adjusted with a plurality of fastening screws. Furthermore, regarding the fixing of the photographic lens 1 to the camera apparatus main body 2, in the present embodiment, it can be easily fixed by the operation of rotating and tightening the stopper portion 5. Thereby, in the camera apparatus 10 of this embodiment, size reduction and cost reduction can be achieved.

  In addition, since the adjustment of the attachment position of the photographic lens 1 to the camera device body 2 is simple, the camera device 10 is used as a monitoring camera, and the optical axis C and the imaging of the photographic lens 1 can be easily taken in a scene where the camera lens 10 is installed at a predetermined location. The imaging center O of the sensor 7 can be easily aligned.

  In this embodiment, since the optical axis C of the photographing lens 1 and the imaging center O of the imaging sensor 7 can be matched, the occurrence of vignetting is suppressed even when a wide-angle lens is used as the photographing lens 1. be able to.

  In the present embodiment, a flat washer having a flat surface is used as the washer 6. However, a wave washer having a wavy surface may be used. When the wave washer is used, the holder portion is restored by the restoring force that returns the wave washer from its collapsed state to the original shape even when the stopper 5 is loosened when adjusting the mounting position of the photographing lens 1. The flange portion 4 b of 4 is biased toward the flat surface portion 3 c of the base portion 3. For this reason, the range which can loosen the stopper part 5 can be enlarged, and the adjustment operation | work of the position of the holder part 4 becomes easier.

  In the present embodiment, the base portion 3 is provided with the female screw portion 3a, and the stopper portion 5 is provided with the male screw portion 5c to be screwed together. However, the present invention is not limited to this. Various configurations are possible as long as the holder portion 4 can be fixed between the base portion 3 and the stopper portion 5 and the holder portion 4 can be moved relative to the base portion 3 in a direction perpendicular to the optical axis C of the photographing lens 1. A configuration can be employed.

  As described above, the present invention has been described based on the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the configuration can be appropriately changed without departing from the gist thereof. Is.

  DESCRIPTION OF SYMBOLS 1 ... Shooting lens, 2 ... Camera apparatus main body, 3 ... Base part, 3c ... Plane part, 4 ... Holder part, 4b ... Flange part, 5 ... Stopper part, 5b ... Flange part, 6 ... Washer, 7 ... Imaging sensor, 9 ... Case, 10 ... Camera device

Claims (5)

In a camera device including a camera device main body and an attachment portion for attaching a photographing lens to the camera device main body, the attachment portion includes:
A base portion formed of a cylindrical member provided in the camera device body;
A member fixed to one end of the photographing lens, abutting on the base portion and movable in a direction perpendicular to the optical axis of the photographing lens;
A stopper portion that is configured by a cylindrical member that can be screwed to the base portion, and that fixes the holder portion to the base portion by screwing the holder portion with the holder portion sandwiched between the base portion and the base portion. A camera device comprising: On the inner peripheral surface of the base portion, a plane portion having a surface orthogonal to the optical axis of the photographing lens is provided,
The holder part has a flange part in contact with the flat part,
The camera device according to claim 1, wherein the stopper portion fixes the holder portion to the base portion by screwing the flange portion between the stopper portion and the base portion. To adjust the position of the taking lens,
3. The camera device according to claim 1, wherein the stopper is loosened and the holder unit to which the photographing lens is fixed is moved in a direction orthogonal to the optical axis. 4. The camera device according to claim 2, wherein an inner diameter of the base portion closer to the photographing lens than the flat portion is larger than an outer diameter of the flange portion. Between the holder part and the stopper part, it has a hollow disk-shaped washer,
The camera device according to claim 1, wherein the movement of the holder portion is performed in a state where the holder portion is in contact with the flat portion and the washer.

Images