JP2015185924A - Intercom device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intercom device in which damage on a lens can be suppressed, when an impact is given to the lens, although a lens cover is not attached.SOLUTION: Insertion holes 14b, 14b, ..., through which the shaft of a screw 27 can be inserted, are bored in a camera 5 so as to be located on the same circle having a center in the central part of a lens 4. Screws 27, 27, ... are screwed from the rear of the camera 5 into the rear surface of a front case 2 through the insertion holes 14b, 14b, ..., and a coil spring 29, compressed in the axial direction, is wound around the shaft of each screw 27. The camera 5 is installed on the rear surface of the front case 2, by energizing the camera 5 to the rear surface side of the front case 2 by means of the coil spring 29.

Description

  The present invention relates to an intercom device provided with an imaging means for imaging a visitor or the like, for example.

  2. Description of the Related Art Conventionally, interphone slave devices, which are examples of interphone devices, may be equipped with a camera for imaging visitors and the like. As such an interphone slave unit with a camera, for example, there is one disclosed in Patent Document 1, in which the camera lens is exposed on the front surface of the main body case, and a lens cover is attached so as to cover the lens. Had a structure.

JP 2010-93648 A

  However, when the lens cover is attached, it is necessary to make the lens cover protrude more forward than the main body case. This is due to the camera resolution being reduced due to damage to the lens cover and the reflection of sunlight generated at the lens cover interface. The generation of harmful ghosts and flares is a problem. Therefore, a structure in which the lens cover is not attached is conceivable. However, for example, in order to enable super wide-angle imaging using a fisheye lens or the like, the lens needs to protrude forward from the front surface of the main body case. Therefore, the structure in which the lens cover is not simply attached has a problem that the lens is easily damaged when an impact is given to the lens by, for example, hitting it with a hammer.

  Accordingly, the present invention has been made in view of the above problems, and provides an interphone device that can suppress damage to a lens when an impact is applied to the lens, even though the lens cover is not attached. It is something to try.

In order to achieve the above object, according to the first aspect of the present invention, a camera window is provided on the front surface of the main body case, and the camera having the lens is exposed so that the lens is exposed from the camera window. An intercom device installed inside the camera, wherein a plurality of insertion holes are drilled at positions on the same circumference centered on the center of the lens in the camera, and the front side of the camera through the insertion holes. A coil spring provided with a plurality of guide means extending to the rear side, and provided with a large diameter portion at a position on the rear side of the camera of each guide means, and in each guide means, the coil spring is contracted in the axial direction across the rear surface and the large diameter portion of the camera The camera is installed inside the body case with the coil spring biased toward the front of the body case by the biasing force of the coil spring, and the rearward load exceeding the biasing force is applied to the camera. If that, the camera against the urging force of the coil spring, characterized by being movable in the inner side of the main body case.
According to the first aspect of the present invention, when a rearward load exceeding the urging force is applied to the camera, the camera can move to the inside of the main body case against the urging force of the coil spring. The camera can absorb the impact while moving to the inside of the main body case, even if it is hit with a. Therefore, damage to the lens can be suppressed without providing a lens cover as in the prior art. Further, when the load is released, the camera can be automatically returned to the normal installation position by the urging force of the coil spring, so that it is not necessary to change the installation position of the camera one by one, which is convenient. In addition, since the multiple insertion holes are located on the same circumference centered on the center of the lens, the camera does not tilt from the installation position when moving backward, and remains in the installation position. Move backwards. Therefore, when an impact is applied, the camera tilts from the installation posture and is caught by some member, and it is possible to prevent the occurrence of a situation such as being unable to return to the installation position even though the impact is suppressed.
In the present invention, “perforating a plurality of insertion holes at a position on the same circumference centered on the center of the lens in the camera” is not limited to the exact same circumference but slightly the same circumference. Including those that are off the top.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the center of gravity of the camera is positioned on the center of the optical axis of the lens.
According to the second aspect of the present invention, when the center of gravity of the camera is positioned on the center of the optical axis of the lens, when the rearward load exceeding the urging force is applied to the camera, the load is applied to each screw. Can be dispersed evenly, and the effect of suppressing damage to the lens can be made more remarkable.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the camera can be moved to the inside of the main body case until the front end of the lens enters the inner side of the main body case from the front surface of the main body case. It is characterized by that.
According to the invention described in claim 3, since the camera can be moved to the inner side of the main body case until the front end of the lens enters the inner side of the main body case from the front surface of the main body case, the effect of suppressing damage to the lens is achieved. Can be made even more prominent.

  According to the present invention, a plurality of insertion holes are formed at positions on the same circumference around the center of the lens in the camera, while a plurality of guides extending between the front side and the rear side of the camera via the insertion hole. And a large-diameter portion at a position on the rear side of the camera of each guide means. In each guide means, a coil spring contracted in the axial direction is wound around the rear surface and the large-diameter portion of the camera. The camera is installed inside the main body case with the biasing force biased to the front side of the main body case. If a rearward load exceeding the biasing force is applied to the camera, the camera will resist the biasing force of the coil spring. Therefore, it can be moved to the inside of the main body case. Therefore, even if the camera is hit with a hammer, for example, the camera can absorb the impact while moving to the inside of the main body case, so that the lens can be prevented from being damaged without providing a lens cover as in the prior art. be able to.

It is explanatory drawing which showed the intercom cordless handset from the front side. It is perspective explanatory drawing which showed the front case in the state which installed the camera from the rear surface side. It is a perspective explanatory view in the state which decomposed | disassembled the front case of FIG. It is a partial cross section explanatory view of the front case in the state where the camera was installed. It is a partial cross section explanatory view of the front case when a camera moves back.

  Hereinafter, an intercom slave which is an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing the intercom slave 1 from the front side.
The intercom handset 1 has a main body case composed of a front case 2 disposed on the front side and a rear case (not shown) disposed on the rear side. A circular camera window 3 is opened, and a camera 5 (shown in FIG. 2) is installed in the main body case so that the lens 4 is exposed in the camera window 3. On the right side of the camera window 3, a microphone unit 6 for calling is provided. Furthermore, a call button 7 that is operated when a visitor calls a resident and a speaker unit 8 for a call are provided in the lower front portion of the main body case. Such an intercom handset 1 is installed on the wall surface of the entrance of the dwelling unit. When a call button 7 is operated by a visitor, an interphone master unit (not shown) installed in the dwelling unit. And the camera 5 is actuated to image a visitor. Note that the video imaged by the camera 5 is displayed on a monitor provided in the intercom master unit.

Here, a structure related to installation of the camera 5 which is a main part of the present invention will be described in detail with reference to FIGS.
FIG. 2 is a perspective explanatory view showing the front case 2 with the camera 5 installed from the rear side. FIG. 3 is an explanatory perspective view of the front case 2 of FIG. 2 in an exploded state. FIG. 4 is a partial cross-sectional explanatory view of the front case 2 in a state where the camera 5 is installed. FIG. 5 is a partial cross-sectional explanatory view of the front case 2 when the camera 5 moves rearward.

  The camera 5 includes a lens unit 11, a lens holder 10 that supports the rear portion of the lens unit 11, and a circuit board 12 on which an imaging element (not shown) and the like are mounted. The lens holder 10 is a base having a flat front surface, and a screwing hole 13 for screwing the lens unit 11 is provided at the center thereof. Further, the lens holder 10 is provided with three fixing pieces 14, 14... For fixing the lens holder 10 to the back surface of the front case 2. Each fixing piece 14 is provided with a positioning convex portion 14a protruding rearward, and an insertion hole 14b through which the shaft portion of the screw 27 can be inserted is formed in the approximate center of the positioning convex portion 14a. Each insertion hole 14b has a small-diameter rear part and a front part larger in diameter than the rear part, and the front part can fit the tip of a fixed boss 26 projecting from the rear surface of the front case 2. It functions as a fitting recess (not shown). And especially the insertion hole 14b of each fixed piece 14 is the state located on the same periphery centering on the center (namely, center of the lens 4) of the screwing hole 13. FIG.

  On the other hand, the lens unit 11 includes a lens 4 and a lens barrel 17 that holds the lens 4. The lens barrel 17 is formed in a cylindrical shape extending in the front-rear direction. The lens barrel 17 accommodates the lens 4 therein and can be held in a state in which a part thereof is exposed from the front surface. The rear part of the lens barrel 17 is formed as a male screw part 18 that can be screwed into the screw hole 13. Further, a constricted mounting concave portion is provided at a position adjacent to the front side of the male screw portion 18 so that an O-ring 21 (shown in FIG. 4) can be attached.

  In addition, the circuit board 12 is a board on which various elements such as an imaging element are mounted on the front surface, and is arranged on the rear side of the lens holder 10. The circuit board 12 has screw holes 23 and 23 for screwing to the lens holder 10, a positioning hole 24 into which the positioning convex portion 14a of the lens holder 10 can enter, and positioning notches 25 and 25. Is provided.

  The assembly of the camera 5 as described above and the installation to the front case 2 will be described. First, with the O-ring 21 fitted, the male screw portion 18 of the lens barrel 17 is screwed into the screw hole 13 from the front of the lens holder 10. The lens unit 11 and the lens holder 10 are integrated. The focus can be adjusted by adjusting the degree of screwing of the lens unit 11 to the lens holder 10. When the lens unit 11 is screwed in, as the focus approaches the in-focus point, the O-ring 21 is deformed so as to be crushed in the mounting recess, and the torque is increased. The lens unit 11 is firmly fixed to the lens holder 10 at the in-focus point. Will be.

  Then, after the positioning protrusions 14a, 14a,... Of the lens holder 10 are fitted into the corresponding positioning holes 24 and positioning notches 25, 25 of the circuit board 12, the position of the lens holder 10 on the circuit board 12 is positioned. If the lens holder 10 and the circuit board 12 are integrated by screwing using the screw holes 23, 23, the assembly of the camera 5 is completed. In this assembled state, the center of gravity of the camera 5 is located on the center of the optical axis of the lens 4.

  Next, the elastic member 22 is disposed on the rear surface of the front case 2 so as to surround the camera window 3, and the lens 4 is exposed into the camera window 3, and the fixing pieces 14, 14. The tips of the fixed bosses 26, 26,... Are inserted into the recesses. In this state, the screws 27, 27,... Are screwed into the screw holes of the fixed bosses 26, 26,. At this time, the washer 28 and the coil spring 29 in which the front-rear direction is the axial direction are interposed in the shaft portion of each screw 27, and each screw 27 is screwed so that the coil spring 29 is interposed between the rear surface of the circuit board 12 and the washer 28. Try to be in a contracted state in the axial direction. Then, a guide means including a fixed boss 26 and a screw 27 is provided over the front side and the rear side of the camera 5 through the insertion hole 14b, and the screw 27 has a large position at the rear side of the camera 5. There is a washer 28 as a diameter portion, and a coil spring 29 which is contracted in the axial direction over the rear surface of the camera 5 and the washer 28 is wound around the shaft portion of the screw 27. Therefore, the camera 5 is pressed forward (that is, the rear surface side of the front case 2) by the biasing force of the coil springs 29, 29,..., And the installation of the camera 5 on the rear surface of the front case 2 is completed.

  When the camera 5 installed as described above is subjected to a rearward load exceeding the urging force of the coil springs 29, 29,..., For example, by being hit with a hammer from the front side of the main body case, To do. Then, the camera 5 moves rearward (that is, inside the main body case) along the shafts of the screws 27, 27,... Against the urging force of the coil springs 29, 29,. Further, when the impact is subsided, the coil springs 29, 29,... Move forward along the shafts of the screws 27, 27,. Note that the length of the screw 27, the axial length of the coil spring 29, and the biasing force of the coil spring 29 are determined by the front end of the lens 4 when the camera 5 moves rearward (that is, the frontmost surface of the lens 4 bulging out). Can enter the inside of the main body case, that is, a value that allows the lens 4 to enter until the front end of the lens 4 is located behind the front surface of the front case 2 as shown in FIG.

According to the intercom handset 1 having the above-described configuration, the camera 5 is provided with the insertion holes 14b, 14b,... Through which the shaft portion of the screw 27 can be inserted, and the insertion holes 14b, 14b,. .. Are screwed into the rear surface of the front case 2 and coil springs 29 that are axially contracted are wound around the shafts of the respective screws 27, and the camera 5 is attached to the front case 2 by the coil springs 29. The camera 5 is installed on the rear surface of the front case 2 by urging the rear surface side. Therefore, even if the camera 5 (especially the lens 4 etc.) is subjected to a strong rearward impact by being hit with a hammer, for example, the camera 5 absorbs the impact while moving to the inside of the main body case. Can do. Therefore, damage to the lens 4 can be suppressed without providing a lens cover as in the prior art.
Further, when the impact is subsided, the camera 5 can be automatically returned to the normal installation position by the urging force of the coil springs 29, 29,... .
Further, since the insertion holes 14b, 14b,... Are provided so as to be located on the same circumference with the center of the lens 4 as the center, the camera 5 is inclined from the installation posture when moving backward. Things are hard to happen. That is, the camera 5 moves backward with the installation posture. Therefore, when an impact is applied, the camera 5 is tilted from the installation posture and is caught by some member, and it is possible to prevent the occurrence of a situation such as being unable to return to the installation position in spite of the impact being suppressed.

In addition, since the camera 5 is formed so that its center of gravity is positioned on the center of the optical axis of the lens 4, the impact can be evenly distributed to the screws 27 when an impact is applied. The effect of suppressing damage to the lens 4 can be made even more remarkable.
Furthermore, when the camera 5 moves rearward, the front end of the lens 4 can enter the inside of the main body case, so that the effect of suppressing damage to the lens 4 can be made extremely remarkable.
In addition, each insertion hole 14b has a small-diameter rear portion and a front portion that is larger in diameter than the rear portion and that can be fitted with the front end of a fixed boss 26 that projects from the rear surface of the front case 2. The camera 5 is installed in a state in which is inserted into the tip of the fixed boss 26. Therefore, when an impact is applied to the camera 5, it is possible to more reliably prevent a situation in which the camera 5 is inclined from the installation posture.

  In addition, the intercom apparatus according to the present invention is not limited to the aspect of the above-described embodiment, and the entire configuration of the interphone apparatus as well as the configuration of the camera 5 itself and the installation of the camera 5 in the main body case. About a structure, it can change suitably as needed in the range which does not deviate from the meaning of this invention.

For example, in the above embodiment, the screw 27 is employed as a guide means when the camera 5 moves rearward, but a projection (having a large diameter portion on the base side) protruding forward is provided on the rear case, It is also possible to employ the protrusion as a guide means instead of the screw 27. That is, a coil spring is wound around the protrusion, and the protrusion is inserted into the insertion hole and the coil spring is contracted in the axial direction and comes into contact with the rear surface of the camera 5 when the rear case is assembled to the front case. If it is set as a structure, there can exist an effect similar to the said embodiment.
Further, for example, a guide protrusion (having a large diameter portion on the front end side) that protrudes rearward from the front case is provided, and the coil spring 29 is wound around the guide protrusion between the rear surface of the camera 5 and the inner surface of the rear case. It is possible to adopt such a configuration.

Furthermore, in the above embodiment, three guide means for the camera 5 are provided. However, there is no problem if four or more guide means are provided, and it is needless to say that the design of the shape of the insertion hole 14b can be changed. Further, when the screw 27 is employed as the guide means, the presence or absence of the washer 28 may be appropriately changed according to the diameter of the coil spring 29 and the like, and the screw head of the screw 27 can be a large diameter portion.
Furthermore, in the above embodiment, a plurality of insertion holes 14b, 14b,... Are formed at positions on the same circumference centered on the center of the lens 4 in the camera 5, but the exact same circumference. There is no problem even if any of the insertion holes 14b, 14b,... Is located at a position slightly off the same circumference instead of above.
In addition, although the interphone device has been described in the above-described embodiment, the interphone device of the present invention is an interphone device having a camera. It can be satisfactorily applied to other intercom devices.

  1 .. Interphone cordless handset (interphone device), 2. Front case (main body case), 3. Camera window, 4. Lens, 5. Camera, 10. Lens holder, 11. Lens unit, 12. ..Circuit board, 13 ..Screw hole, 14 ..Fixing piece, 14 b ..Insertion hole, 26 ..Fixing boss (guide means), 27 ..Screw (guide means), 28 ..Washer (large diameter) Part), 29 .. Coil spring.

Claims (3)

An intercom device in which a camera window is installed inside the main body case so that a camera window is opened on the front surface of the main body case and the lens is exposed from the camera window.
While drilling a plurality of insertion holes at the same circumference around the center of the lens in the camera,
A plurality of guide means extending between the front side and the rear side of the camera through the insertion hole, and a large-diameter portion at a position on the rear side of the camera of each guide means, in each guide means, A coil spring shrunk in the axial direction over the rear surface of the camera and the large diameter portion is wound,
In a state of being biased toward the front side of the main body case by the biasing force of the coil spring, the camera is installed inside the main body case,
The interphone device, wherein when the rearward load exceeding the urging force is applied to the camera, the camera can move to the inside of the main body case against the urging force of the coil spring.   The intercom device according to claim 1, wherein the center of gravity of the camera is positioned on the optical axis center of the lens.   3. The intercom according to claim 1, wherein the camera can be moved to the inner side of the main body case until the front end of the lens enters the inner side of the main body case with respect to the front surface of the main body case. machine.

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