JP2016004248A - Lens cover and monitoring camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens cover capable of preventing ghost images from appearing on images photographed by using a lens of different size, and to provide a monitoring camera requiring no accessory lens covers of different shapes.SOLUTION: A lens cover 13 is attached to a camera main body 15 which includes an imaging lens 17 so as to slide forward/backward in a direction along the optical axis 19 of the imaging lens 17 according to the size of the imaging lens 17 replaced with a different kind of imaging lens. The lens cover 13 may be attached to the camera main body 15 so as to slide forward/backward in a direction along the optical axis 19 of the imaging lens 17 being interposed by an adapter. The lens cover 13 is preferably adapted to slide step by step relative to the camera main body by means of a notch engagement mechanism constituted of a notch and a notch engagement part.

Description

  The present invention relates to a lens cover that protects an imaging lens and a surveillance camera to which the lens cover is attached.

  Surveillance cameras are widely used for the purposes of crime prevention, disaster prevention, measurement, recording, and the like, and are provided with an imaging lens so as to protrude from the surveillance camera body. The imaging lens exposed to the outside can be protected using a lens cover (see, for example, Patent Document 1).

  In addition, the surveillance camera needs to periodically expose the imaging lens to the outside in order to adjust focus, zoom, angle of view, etc. and perform maintenance and inspection, for example. The surveillance camera is often placed at a high place, and when the lens cover is removed to expose the imaging lens, it may be difficult to secure a place for the lens cover. Therefore, the surveillance camera disclosed in Patent Document 1 can make the imaging lens face the outside greatly without removing the lens cover.

  That is, as shown in FIG. 16, the monitoring camera 501 includes a lens cover 507 disposed adjacent to the housing 505 so as to cover the imaging lens 503. A cover extending portion 509 extending from the lens cover 507 toward the housing 505 side is locked to the housing 505 at a position where the lens cover 507 is separated from the housing 505 by a preset distance.

  Therefore, according to the monitoring camera 501, when the lens cover 507 is moved away from the housing 505 by a preset distance so that the imaging lens 503 faces the outside, the locking means 511 is separated from the housing 505. The cover extension 509 is locked. For this reason, unlike the conventional type in which the lens cover is removed as in the surveillance camera, it is not necessary to secure a place for the lens cover 507.

JP 2011-227272 A

  However, when the lens cover 507 shown in Patent Document 1 does not match the size of the imaging lens 503, a part of the lens cover 507 is reflected in the image obtained by the imaging of the monitoring camera 501, or the lens is large. In some cases, light interference may occur. In order to avoid the reflection and interference, it is necessary to attach a lens cover 507 having a different shape according to the size of the imaging lens 503. For this reason, it is necessary to prepare a large number of lens covers 507 in accordance with the type of the imaging lens 503, and there is a problem that the number of parts may be increased.

  In order to solve the above-described conventional problems, the present invention provides a lens cover that avoids reflection and interference with an image obtained by imaging even when lenses having different sizes are used, and the lens cover is attached to the lens cover. It is an object of the present invention to provide a surveillance camera.

  The present invention includes a cover main body attached to a camera main body including an imaging lens, and the cover main body follows the optical axis of the imaging lens according to the size of the different imaging lens to be replaced. It is a lens cover provided with a slide mechanism section for sliding the cover body before and after the direction.

  Moreover, this invention is a surveillance camera with which the lens cover was attached to the said camera main body directly or through the adapter.

  According to the lens cover of the present invention, even when an imaging lens having a different size is used, it is possible to avoid reflection and interference with an image obtained by imaging.

  According to the surveillance camera of the present invention, it is not necessary to prepare a lens cover having a different shape as an accessory, and even when an imaging lens having a different size is used, reflection or interference with an image obtained by imaging is prevented. It can be avoided.

The perspective view of the surveillance camera of 1st Embodiment 1 is an exploded perspective view of the surveillance camera shown in FIG. 1 is an exploded perspective view of the surveillance camera shown in FIG. FIG. 2 is a perspective view of the camera body shown in FIG. 2 as viewed from below. (A) Perspective view showing notch on upper side of lens cover, (B) Perspective view showing notch on lower side of lens cover The rear view which looked at the camera body shown in FIG. 1 from the rear side 1 is a perspective view of the lens cover shown in FIG. (A) Vertical sectional view of the surveillance camera when the lens cover protrudes, (B) Vertical sectional view of the surveillance camera when the lens cover is pushed in Exploded perspective view of surveillance camera of second embodiment Exploded perspective view of adapter and fall prevention member An exploded perspective view of the surveillance camera before connecting the lens cable Disassembled perspective view before attaching the lens cover (A) Main part longitudinal cross-sectional view of the surveillance camera when the lens cover protrudes, (B) Main part longitudinal cross-sectional view of the surveillance camera when the lens cover is pushed in (A) A perspective view of a modified lens cover having a simple cylindrical slide structure, (B) a perspective view of a modified lens cover having a screw structure, and (C) a perspective view of a modified lens cover having a slide hole structure. FIG. 4D is a perspective view of a lens cover having a pin guide structure. (A) A perspective view of a lens cover of a modified example having a V-shaped pantograph structure, (B) a perspective view of a lens cover of a modified example having an X-shaped pantograph structure, and (C) a perspective view of a lens cover of a modified example having a cam follower structure. Figure An exploded perspective view of a conventional surveillance camera equipped with a lens cover

  Hereinafter, embodiments of a lens cover and a surveillance camera according to the present invention will be described with reference to the drawings. In the first embodiment, a monitoring camera 11 of a type that does not require the attachment of an adapter 75 described later between the lens cover 13 and the camera body 15 will be described. In the second embodiment, the lens cover 77 and the camera are described. A monitoring camera 73 of a type that requires attachment of an adapter 75 described later with the main body 15 will be described.

(First embodiment)
FIG. 1 is a perspective view of a monitoring camera 11 according to the first embodiment. The surveillance camera 11 shown in FIG. 1 includes a lens cover 13. The lens cover 13 is attached to the camera body 15 and protects the imaging lens 17 (see FIG. 2) exposed to the outside. For example, the monitoring camera 11 needs to periodically expose the imaging lens 17 to the outside in order to adjust the focus, zoom, angle of view, etc. and perform maintenance and inspection. Further, the imaging lens 17 is replaceable according to various sizes (for example, a lens diameter or a lens length in a direction along the optical axis 19 (see FIG. 2)) depending on the telephoto or wide angle, and is attached to the camera body 15. For this reason, the lens cover 13 can be attached to and detached from the camera body 15.

  In the present embodiment, the lens cover 13 freely slides the cover body 23 (see later) in front and rear in the direction along the optical axis 19 of the imaging lens 17 according to the size of the different type of imaging lens 17 to be replaced. A slide mechanism unit (described later) is provided and attached to the camera body 15. That is, one type of lens cover 13 can be used regardless of the size of the different types of imaging lenses 17. In this specification, the front side refers to the subject side, and the rear side refers to the camera body side. Further, the upper side means the upper side of FIG. 1, and the lower side means the lower side of FIG.

  FIG. 2 is an exploded perspective view of the monitoring camera 11 shown in FIG. FIG. 3 is an exploded perspective view of the monitoring camera 11 shown in FIG. 1 before the lens cover is attached. FIG. 4 is a perspective view of the camera body 15 shown in FIG. 2 as viewed from below. FIG. 5A is a perspective view showing the notch 21 on the upper side of the lens cover 13. FIG. 5B is a perspective view showing the notch 21 on the lower side of the lens cover 13. 6 is a rear view of the camera body 15 shown in FIG. 1 as viewed from the rear side. FIG. 7 is a perspective view of the lens cover 13 shown in FIG. 1 to which a light shielding member is attached.

  As shown in FIGS. 2 to 7, the lens cover 13 includes a cover body 23, a protective glass 25, a light shielding plate 27, a side cover 29 that is a light shielding member, a front option mounting bracket 31, and a wire mounting bracket 33. And an attachment fitting 35. The cover body 23 is formed in a bottomed rectangular tube shape, and a rectangular front opening 39 is formed in a tube bottom portion 37 on the front surface side. A protective glass 25 is attached to the front opening 39. A light shielding plate 27 is attached behind the protective glass 25 of the cover body 23. The light shielding plate 27 shields unnecessary external light incident on the imaging lens 17, and is molded of thin polystyrene in each embodiment including this embodiment. Even if the light shielding plate 27 has a diameter of 2 to 5 mm larger than the periphery of the imaging lens 17, the light shielding effect of outside light can be obtained. However, like the light shielding plate 89 of the second embodiment described later, the light shielding plate 89 is provided. It is also possible to make the opening diameter small and provide a cut in part or all of the periphery of the light shielding plate 89 to be bent and closely contact the periphery (see FIG. 9).

  A rectangular cable opening 41 is formed on one side surface of the cover body 23. One end side of a lens cable 43 (see FIG. 7), which is an ALC (Auto Light Control) lens connector cable, is connected to the imaging lens 17. A connector 45 (see FIG. 11) is attached to the other end side of the lens cable 43, and the connector 45 is coupled to the camera body 15. The lens cable 43 is led out from the cable opening 41 of the cover body 23 and connected to the camera body 15. A side cover 29 is attached to the cable opening 41.

  The side cover 29 is formed with a cable lead-out hole 47 (see FIG. 2) through which the lens cable 43 is inserted. That is, the lens cable 43 is led out from the cable lead-out hole 47 of the side cover 29 attached to the cable opening 41 (see FIG. 7). The side cover 29 is attached to the camera body 15 so as to be slidable in the front-rear direction. The side cover 29 is provided with an overlap portion 49 that overlaps the front side surface of the cover body 23 at the front portion. Even if the side cover 29 is slid, the cable opening 41 is not exposed by the overlap portion 49.

  Further, the side cover 29 as an example of the light shielding member is juxtaposed to the cover main body 23 and closes the cable opening 41 formed in the cover main body 23 so that the cable opening 41 on the camera main body side is connected to the inside of the cover main body 23. Shields incident light from entering.

  As shown in FIG. 3, the front option mounting bracket 31 is fixed to the front upper surface 51 of the camera body 15 with screws 53 (see FIG. 2). A wire mounting bracket 33 is fixed to the front option mounting bracket 31 together. A wire 55 is connected to the wire fitting 33, and the wire 55 is attached to a camera mount (not shown). The attachment fitting 35 is formed with a notch engaging portion 57 as an example of an engaging portion that is bent into a U-shape and can be elastically displaced, for example. As shown in FIG. 4, the front option mounting bracket 31 is fixed to the front lower surface 59 of the camera body 15 with screws 53. An attachment metal fitting 35 is fixed to the front option attachment metal 31 together.

  The lens cover 13 is attached so that the opening side opposite to the protective glass 25 covers the front side of the camera body 15. The lens cover 13 is slid stepwise with respect to the camera body by a notch engaging structure 61 (see FIG. 8). The notch engagement structure portion 61 includes, for example, a notch 21 as an example of a slide mechanism portion in the present embodiment and a notch engagement portion 57 formed on the front option mounting bracket 31.

  The notch 21 is formed with a plurality of (for example, about 10) small (for example, triangular) protrusions (notches) that are continuous from the rear end of the cover body 23 toward the front. The notch 21 is provided on the internal ceiling surface 63 shown in FIG. 5A and the internal bottom surface 65 shown in FIG. These upper and lower notches 21 are elastically contacted with notch engaging portions 57 of the front option mounting bracket 31 fixed to the front upper surface 51 and the front lower surface 59 of the camera body 15 as shown in FIG.

  Accordingly, the cover body 23 of the lens cover 13 is slid stepwise with respect to the camera body 15, for example, with a click feeling caused by the engagement between the notch 21 and the notch engaging portion 57. The lens cover 13 that has been slid in accordance with the size of the imaging lens 17 has a fixing screw (not shown) inserted through the slit 69 formed in the bottom plate portion 67 shown in FIG. Thus, the camera body 15 is slid and restricted.

  Next, the operation of the lens cover 13 of the present embodiment will be described with reference to FIGS. FIG. 8A is a longitudinal sectional view of the monitoring camera 11 when the lens cover 13 protrudes. FIG. 8B is a longitudinal sectional view of the monitoring camera 11 when the lens cover 13 is pushed.

  The lens cover 13 of the present embodiment is slidably attached to the camera body 15 before and after the imaging lens 17 along the optical axis 19. The camera body 15 can be attached with an imaging lens 17 having a different size (for example, a lens diameter or a lens length in a direction along the optical axis 19). A front opening 39 of the lens cover 13 is closed with a protective glass 25 for protecting the imaging lens 17.

  For example, in the case of the imaging lens 17 having a short lens length, the distance between the imaging lens 17 and the front opening 39 becomes large as shown in FIG. In this case, the imaging light 71 incident on the imaging lens 17 may be blocked by the front opening edge (occurrence of vignetting). Therefore, a front opening edge portion may be reflected in an image obtained by imaging by the monitoring camera 11 (hereinafter simply referred to as “captured image”). At this time, as shown in FIG. 8B, the lens cover 13 is slid in a direction approaching the imaging lens 17 (rear in the direction along the optical axis 19). Thereby, the imaging light 71 interrupted by the front opening edge is eliminated. As a result, occurrence of reflection of the front opening edge portion in the captured image is suppressed.

  Further, in the lens cover 13, the slide adjustment position of the lens cover 13 can be clearly determined by a click feeling or the like by the notch engagement structure portion 61. The lens cover 13 can be temporarily fixed at the slide adjustment position by the notch engaging structure 61. When the lens cover 13 reaches the optimum temporary fixing position, the fixing screw inserted through the slit 69 of the bottom plate portion 67 is screwed into the camera body 15 to be permanently fixed to the camera body 15.

  In the lens cover 13, a side cover 29 is attached to the lens cover 13. In the lens cover 13, for example, a cable opening 41 for leading out the cable is formed. The cable opening 41 is closed by a side cover 29 having a cable outlet hole 47. Thereby, it becomes possible to avoid that external light enters from the cable opening 41 and leakage light is reflected on the protective glass 25 to cause reflection. As shown in FIG. 7, the lens cable 43 connected to the imaging lens 17 is once led out to the outside from a cable lead-out hole 47 formed in the side cover 29 and connected to the camera body 15.

  Further, the side cover 29 is slidably attached to the lens cover 13. Therefore, even if the lens cover 13 is slid forward with respect to the camera body 15, for example, the side cover 29 is slid rearward (in the direction of the arrow shown in FIG. 7) with respect to the lens cover 13, thereby Always has a constant opening area. Thereby, the surveillance camera 10 can improve the appearance, suppress the entry of dust and the like into the lens cover, and improve the dust resistance.

  In addition, a light shielding plate 27 is installed inside the lens cover 13, and the light leaked from the cable opening 41 provided in the lens cover 13 or the rear thereof into the gap between the camera body 15 and the lens cover 13 is protected glass. 25 to prevent the light from entering the imaging lens.

(Second Embodiment)
Next, a lens cover according to a second embodiment will be described with reference to the drawings. FIG. 9 is an exploded perspective view of the monitoring camera 73 according to the second embodiment. FIG. 10 is an exploded perspective view of the adapter 75 and the fall prevention member. FIG. 11 is an exploded perspective view of the monitoring camera 73 before the lens cable 43 is connected. FIG. 12 is an exploded perspective view before the lens cover 77 is attached. In addition, the same code | symbol is attached | subjected to the member same as the member shown in FIGS. 1-8, the overlapping description is abbreviate | omitted and a different content is demonstrated.

  In the monitoring camera 73 of the present embodiment, the lens cover 77 is provided with a light source for illumination. In the specification in which the illumination light source is provided, the adapter 75 is attached to the cover body 23. The adapter 75 connects the cover body 91 of the lens cover 77 and the camera body 15, and is mounted with a driver (not shown) for a light source for illumination. The lens cover 77 is attached to the camera body 15 via the adapter 75.

  That is, the lens cover 77 is slidably attached to the camera body 15 via the adapter 75 before and after the imaging lens 17 in the direction along the optical axis 19. The lens cover 77 includes an LED cover 79, an LED unit 81 as an example of an illumination light source, a pair of upper and lower heat sinks 83, a heat sink base 85, an LED inner cover 87, a protective glass 25, a light shielding plate 89, The cover main body 91 and the folding band 93 as an example of a fall prevention member are provided.

  The LED unit 81 includes a pair of upper and lower LED (Light Emission Diode) light sources in which a plurality of LEDs are arranged in a horizontal line. The line-shaped LEDs 95 arranged in a pair above and below emit illumination light toward the imaging target. For example, infrared light is used as the illumination light.

  In the lens cover 77, an isolation space 97 (see FIGS. 13A and 13B) as an example of an isolation portion that optically isolates the LED unit 81 from the imaging lens 17 is juxtaposed with the cover body 91. It is equipped as such. In the present embodiment, the isolation space 97 is defined by the cover body 91 and the LED inner cover 87 and accommodates the line-shaped LEDs 95 of the LED unit 81.

  The adapter 75 includes an adapter main body 99, a cable cover 101, a circuit board 103, a front option mounting bracket 31, a wire mounting bracket 33, and an attachment bracket 105.

  A heat sink 83 is attached to the front side of the LED inner cover 87 via a heat sink base 85. An LED unit 81 is attached to the front side of the heat sink 83. The LED inner cover 87 to which the LED unit 81 is attached is attached to the cover main body 91 from the front via a light shielding plate 89. A protective glass 25 is attached to the LED inner cover 87. An LED cover 79 is attached to the front side of the cover body 91, and the LED cover 79 covers the LED unit 81 attached to the LED inner cover 87.

  The adapter main body 99 has an annular portion 107. A rectangular cap lid portion 109 is integrally formed on one side portion of the annular portion 107. A circuit board 103 for driving the LED unit is attached to the back surface of the cap lid portion 109. The cap lid portion 109 can pull out the lens cable 43 in a state where the lens cable 43 is inserted into the opening 110 and shielded from light. The cover main body 91 has a sufficiently large cable opening 41 so that the lens cable 43 and the cover main body 91 do not interfere with each other as in the first embodiment, but the cap lid portion 109 is larger than the cable opening 41 of the lens cover 13. In addition, the cover main body 91 can be adjusted, and it is made large in the front-rear direction so that a gap is not generated at any position and can always be shielded, and light does not enter from the cable opening 41 of the lens cover 13. In other words, the cap lid portion 109 is another configuration example of the light shielding member of the first embodiment. The adapter body 99 is fixed to the camera body 15 by extrapolating the annular portion 107 to the outer periphery of the imaging lens 17. Similarly, the front option mounting bracket 31 and the wire mounting bracket 33 are fixed on the upper surface of the annular portion 107 of the adapter main body 99 fixed to the camera body 15 with screws 53. Further, the attachment fitting 105 is fixed to the lower surface of the annular portion 107 with a screw 53.

  The adapter 75 and the lens cover 77 are connected by a folding band 93 shown in FIG. The folding band 93 is formed in a band shape from a resin material (for example, polystyrene resin). The folding band 93 has a plurality of bent portions 111 in the longitudinal direction. The folding band 93 is formed to be expanded and contracted by being folded by the bent portion 111. The folding band 93 has one end side in the longitudinal direction (flange portion 113) fixed to the adapter main body 99, and the other end side in the longitudinal direction (projection portion 115) locked to the cover body 91. The folding band 93 regulates the detachment of the lens cover 77 from the camera body 15. When the lens cover 77 is attached, the folding band 93 can be folded and accommodated inside the cover. The folding band 93 has a wiring insertion hole 117 through which a part of the wiring is inserted.

  Similar to the notch 21 shown in FIG. 5A, the inner ceiling surface 63 of the cover main body 91 is formed with a notch 21 as an example of a slide mechanism portion in the present embodiment. The notch 21 (see FIGS. 13A and 13B) is elastically contacted with the notch engaging portion 57 of the front option mounting bracket 31 fixed to the annular portion 107 of the adapter main body 99.

  Thereby, the cover main body 91 of the lens cover 77 is slid with respect to the cover main body 91 with a click feeling caused by the engagement between the notch 21 and the notch engaging portion 57, for example. The lens cover 77 that has been slid in accordance with the size of the imaging lens 17 is fixed in the same manner as the lens cover 13 described above. That is, a fixing screw (not shown) inserted through a slit (not shown) formed in the bottom plate portion 67 is screwed to the camera body 15 so as to be slid and restricted to the camera body 15.

  A slide cover 119 shown in FIG. 11 that is slidable in the front-rear direction is attached to one side surface of the camera body 15. In order to attach the adapter 75 to the camera body 15, first, the slide cover 119 is opened as shown in FIG. The cable cover 101 is attached so as to slide forward from the rear of the camera body 15. The cable cover 101 is fixed to the camera body 15 with screws 121. The connector 45 of the lens cable 43 is inserted into the connector insertion port 123 of the cable cover 101 and connected to the camera body 15. Next, the slide cover 119 is closed.

  A light shielding plate 89 is installed inside the lens cover 77 as in the first embodiment, and a cable opening 41 provided in the lens cover 77 or a gap between the camera body 15 and the lens cover 77 is installed. Leakage light inserted from the rear side is prevented from being reflected by the protective glass 25 and entering the imaging lens.

  The lens cover 77 provided with the LED unit 81 is inserted and temporarily fixed from the front of the camera body 15 as shown in FIG. At this time, the lens cover 77 is temporarily fixed by the notch engaging structure 61 (see FIG. 13). The surveillance camera 73 temporarily fixed to the lens cover 77 is fixed to a ceiling or the like. After the surveillance camera 73 is fixed, the lens cover 77 is removed, and the shooting direction and zoom are adjusted. After the adjustment is completed, the lens cover 77 is inserted again from the front of the camera body 15. At this time, the lens cover 77 is positioned at a slide position corresponding to the imaging lens 17 attached to the camera body 15.

  FIG. 13A is a longitudinal sectional view of an essential part of the monitoring camera 73 when the lens cover 77 protrudes. FIG. 13B is a longitudinal sectional view of an essential part of the monitoring camera 73 when the lens cover 77 is pushed.

  For example, in the case of the imaging lens 17 having a short lens length, the lens cover 77 increases the distance between the imaging lens 17 and the front opening 39 as shown in FIG. In this case, the imaging light incident on the imaging lens 17 is blocked by the edge of the front opening 39 (the occurrence of vignetting). Therefore, the edge of the front opening 39 may be reflected in the captured image. At this time, the lens cover 77 is slid in a direction approaching the imaging lens 17 (rear in the direction along the optical axis 19) as shown in FIG. 8B. Thereby, there is no imaging light blocked by the edge of the front opening 39. As a result, the occurrence of reflection of the edge portion of the front opening 39 in the captured image is suppressed.

  Next, the operation of the lens cover 77 of this embodiment will be described. In the lens cover 77, an LED unit 81 is provided on the cover body 91. At this time, the circuit board 103 provided with a driver or the like of the LED unit 81 is mounted on the adapter 75. The adapter 75 is fixed to the camera body 15 such that the annular portion 107 surrounds the imaging lens 17. The adapter 75 is disposed between the camera body 15 and the lens cover 77.

  The lens cover 77 is slidably attached to an adapter 75 fixed integrally with the camera body 15. When the lens cover 77 is slidably attached to the adapter 75, a large sliding distance is secured. This is because when the lens cover 77 is attached to the camera body 15 with the adapter 75 sandwiched therebetween, the adapter 75 is more likely to interfere with the internal structure of the lens cover 77.

  Further, with the lens cover 77, expandability can be imparted to the lens cover 77 while ensuring the versatility of the camera body 15 (while making the camera body 15 common). Thereby, the added value of the surveillance camera 11 can be increased easily. Moreover, when the LED unit 81 is infrared, the monitoring camera 11 can be provided with excellent transparency and spectral characteristics compared to visible light.

  In the lens cover 77, the isolation light 97 shields the emitted light from the LED unit 81 and the reflected light caused by the emitted light hitting the inner surface of the lens cover 77. Thereby, it is possible to suppress illumination light that enters the imaging lens 17 from the LED unit 81 without passing through the subject.

  In the lens cover 77, the lens cover 77 is supported by the camera body 15 by the folding band 93 even when the lens cover 77 is detached from the camera body 15. Thereby, the imaging lens 17 can be made to largely face outside without separating the lens cover 77 from the camera body 15 (that is, without securing a place for the removed lens cover 77).

  In the lens cover 77, the folding band 93 is unfolded and folded in a predetermined flexible region as the lens cover 77 slides. Thereby, the folding band 93 is less likely to interfere with other members such as wiring and cables (not entangled). Further, the folding band 93 is less likely to be entangled with the wiring by actively passing the wiring through the wiring insertion hole 117.

  In the surveillance camera 11 (surveillance camera 73) of this embodiment, the lens cover 13 (lens cover 77) is attached to the camera body 15 directly (or via the adapter 75).

  As described above, in the monitoring camera 11 and the monitoring camera 73, the lens cover 13 and the lens cover 77 can be slid and arranged at positions optimal for the attached imaging lens 17. Accordingly, it is possible to deal with the imaging lenses 17 having various sizes while eliminating the reflection by the single lens cover 13 and the lens cover 77.

  Next, modified examples of the slide structure of the lens cover will be described with reference to FIGS. 14 (A) to 14 (D) and FIGS. 15 (A) to 15 (C).

  The lens cover and the camera body 15 can be slidably coupled with variations of various structures. FIG. 14A is a perspective view of a modified lens cover 125 having a simple cylindrical slide structure. FIG. 14B is a perspective view of a modified lens cover 127 having a screw structure. FIG. 14C is a perspective view of a modified lens cover 129 having a slide hole structure. FIG. 14D is a perspective view of the lens cover 131 having a pin guide structure.

  For example, the lens cover 125 having a simple cylindrical slide structure shown in FIG. 14A is slidable in the direction along the optical axis 19 on the outer periphery of the inner cylindrical portion 133.

  In the lens cover 127 having a screw structure shown in FIG. 14B, a female screw cylinder 139 is screwed into a male screw cylinder 137 having a male screw formed on the outer periphery.

  A lens cover 129 having a slide hole structure shown in FIG. 14C has guide holes 149 of a pair of arm plates 147 protruding from the frame cover 145 to pins 143 protruding on both sides of the main body side frame 141. Are engaged.

  In the lens cover 131 having the pin guide structure shown in FIG. 14D, the four corners of the frame-shaped cover 155 are slidably fitted to the guide pins 153 protruding forward from the four corners of the main body side frame 151.

  FIG. 15A is a perspective view of a modified lens cover 157 having a V-shaped pantograph structure. FIG. 15B is a perspective view of a modified lens cover 159 having an X-shaped pantograph structure. FIG. 15C is a perspective view of a modified lens cover 161 having a cam follower structure.

  A lens cover 157 having a V-shaped pantograph structure shown in FIG. 15A has a pair of upper and lower hem-shaped links 167 and V-shaped links 169 on both sides of the main body side frame 163 and the frame-shaped cover 165. It is connected so as to be able to approach and separate freely.

  In the lens cover 159 having the X-type pantograph structure shown in FIG. 15B, both sides of the main body side frame 171 and the frame-shaped cover 173 are connected to each other by an X-shaped link 175 so as to be able to approach and separate. In this case, the distance between the main body side frame body 171 and the frame-shaped cover 173 can be adjusted by the adjusting screws 179 disposed on the upper and lower ends of one of the pair of link rods 177.

  In the lens cover 161 having the cam follower structure shown in FIG. 15C, the main body side frame body 181 and the frame-shaped cover 183 are slidably guided by the slide rod 185. The main body side frame 181 is provided with a guide pin 187 that is integrally engaged with a cylindrical body 182 that is movable by rotational sliding so as to be rotatable up and down. A guide pin 187 is movably engaged with a curved groove 189 formed on the side of the frame-shaped cover 183. When the cylindrical body 182 rotates, the guide pin 187 rotates, and the main body side frame body 181 and the frame-shaped cover 183 are guided by the guide pin 187 and the curved groove 189 so as to be able to approach and separate.

  Therefore, according to the lens cover 13 and the lens cover 77 according to the first and second embodiments described above, even when the imaging lens 17 having a different size is used, reflection of the captured image is avoided. can do. Further, according to the monitoring camera 11 and the monitoring camera 73 of the first and second embodiments described above, it is not necessary to prepare a plurality of lens covers having different shapes as accessories, and the imaging lenses 17 having different sizes can be provided. Even when it is used, it is possible to avoid reflection on the captured image.

  Finally, the configurations, operations, and effects of the lens cover and the surveillance camera according to the present invention are listed as follows.

  One embodiment of the present invention has a cover body attached to a camera body provided with an imaging lens, and the cover body has the imaging lens according to the size of the different type of imaging lens to be replaced. It is a lens cover provided with a slide mechanism for sliding the cover body in the front and rear direction along the optical axis.

  According to this lens cover, the lens cover can slide freely in the direction along the optical axis of the imaging lens. Thereby, there is no imaging light blocked by the front opening edge of the lens cover. As a result, the reflection of the front opening edge in the captured image is eliminated.

  In addition, an embodiment of the present invention further includes an adapter that connects the cover main body and the camera main body and includes an engagement portion that engages with the slide mechanism portion, and the slide mechanism portion includes the engagement mechanism. It is a lens cover that slides the cover body through a joint.

  According to this lens cover, the light source for illumination is provided on the lens cover. The lens cover is slidably attached to the adapter. As a result, the lens cover is ensured to have a large slide distance.

  In one embodiment of the present invention, the slide mechanism portion is a plurality of protrusions having a predetermined shape formed from a rear end to a front end of the cover body, and the engagement between the protrusion and the engagement portion. Accordingly, the cover body is slid in stages with respect to the camera body.

  According to this lens cover, the slide adjustment position of the lens cover can be clearly discriminated by the engagement between the slide mechanism portion and the engagement portion. In addition, the lens cover can be temporarily fixed at the slide adjustment position by the notch engagement structure including the slide mechanism and the engagement.

  Moreover, one Embodiment of this invention is a lens cover which further has an illumination light source which radiate | emits illumination light toward an imaging target.

  According to this lens cover, expandability can be imparted to the lens cover while ensuring versatility of the camera body (while making the camera body common).

  Moreover, one embodiment of the present invention is a lens cover in which an isolation part that accommodates the illumination light source and optically isolates the illumination light source from the imaging lens is juxtaposed on the cover body.

  According to this lens cover, the light emitted from the illumination light source and the reflected light due to the emitted light hitting the inner surface of the lens cover are shielded by the isolation portion.

  Moreover, one embodiment of the present invention is a lens cover in which a fall prevention member that restricts detachment from the camera body is locked to the cover body.

  According to this lens cover, it is possible to make the imaging lens face greatly outside without separating the lens cover from the camera body (without securing a place for the removed lens cover).

  In one embodiment of the present invention, a first light blocking member that blocks incident light to the inside of the cover body is slidably juxtaposed in the same direction as the sliding direction of the cover body. This is a lens cover.

  According to this lens cover, the first light shielding member slides in the same direction as the sliding direction of the cover body regardless of whether a large-size imaging lens or a small-size imaging lens is used. Regardless of the size of the lens, leakage light of outside light enters from the rear of the lens cover or from a cable opening provided in the cover body, and is reflected on the protective glass to prevent reflection.

  In one embodiment of the present invention, the adapter is provided with a second light-shielding member that shields incident light to the inside of the cover body, and even if the lens cover is slid, The lens cover is a lens cover in which the second light shielding member is larger than the opening of the lens cover so that no gap is generated.

  According to this lens cover, the adapter is provided with a fixed second light shielding member that shields incident light into the cover body, and the second light shielding member is larger than the opening of the lens cover. There is no gap in the lens cover even when the lens is slid relative to the imaging lens.

  Moreover, one Embodiment of this invention is a lens cover by which the protective glass of the said imaging lens and the 2nd light shielding member which shields the incident light to the said protective glass are juxtaposed in the said cover main body.

  According to this lens cover, since the second light shielding member blocks the incident light to the protective glass of the imaging lens, the leakage light of the external light enters from the cable opening provided on the rear side of the lens cover or the cover body, and is protected. Reflection on the glass is prevented from occurring.

  Moreover, one Embodiment of this invention is a lens cover by which the said fall prevention member has flexibility and is folded and accommodated inside the said cover main body.

  According to this lens cover, the fall prevention member is less likely to interfere with other members such as wiring and cables (not entangled).

  One embodiment of the present invention is a surveillance camera characterized in that a lens cover is attached to the camera body directly or via an adapter.

  According to this surveillance camera, it is possible to deal with imaging lenses of various sizes while eliminating the reflection by one lens cover.

  While various embodiments have been described with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present disclosure is useful as a lens cover that avoids reflection of an image obtained by imaging even when imaging lenses having different sizes are used.

  In addition, the present disclosure does not require a lens cover having a different shape as an accessory, and is useful as a surveillance camera that avoids reflection of an image obtained by imaging even when an imaging lens having a different size is used. It is.

11, 73 Surveillance cameras 13, 77 Lens cover 15 Camera body 17 Imaging lens 19 Optical axis 21 Notch 29 Side cover (light shielding member)
57 Notch engaging part 61 Notch engaging structure part 75 Adapter 81 LED unit (light source for illumination)
93 Folding band (Fall prevention member)
97 Isolation space

Claims (12)

A cover body attached to the camera body having an imaging lens;
In the cover body,
According to the size of the different type of imaging lens to be replaced, a slide mechanism unit that slides the cover body in front and back in the direction along the optical axis of the imaging lens is provided.
Lens cover. The lens cover according to claim 1,
An adapter including an engaging portion that connects the cover main body and the camera main body and engages the slide mechanism;
The slide mechanism is
Sliding the cover body through the engaging portion;
Lens cover. The lens cover according to claim 2,
The slide mechanism is
A plurality of protrusions having a predetermined shape formed from the rear end to the front end of the cover body, and the cover body is slid relative to the camera body in stages by engagement of the protrusions and the engagement portion. Let
Lens cover. The lens cover according to claim 2,
An illumination light source that emits illumination light toward the imaging target;
Lens cover. The lens cover according to claim 4,
An isolating portion that houses the illumination light source and optically isolates the illumination light source from the imaging lens is juxtaposed to the cover body.
Lens cover. The lens cover according to any one of claims 1 to 5,
In the cover body,
A fall prevention member that restricts detachment from the camera body is locked.
Lens cover. The lens cover according to any one of claims 1 to 6,
In the cover body,
A first light blocking member that blocks incident light to the inside of the cover body is juxtaposed in the same direction as the sliding direction of the cover body;
Lens cover. The lens cover according to claim 2,
The adapter includes
A second light shielding member for shielding incident light to the inside of the cover body is fixed and provided;
The second light shielding member is larger than the opening of the lens cover so that no gap is generated even when the lens cover is slid.
Lens cover. The lens cover according to any one of claims 1 to 8,
In the cover body,
The protective glass of the imaging lens and a third light shielding member that shields incident light on the protective glass are juxtaposed.
Lens cover. The lens cover according to claim 6,
The fall prevention member is
Having flexibility and being folded and housed inside the cover body;
Lens cover. The lens cover according to claim 1 is directly attached to the camera body.
Surveillance camera. The lens cover according to claim 2 is attached to the camera body via the adapter.
Surveillance camera.

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