JP5113010B2 - Intercom device entrance cordless handset - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an entrance phone of an intercom device, and more particularly to an entrance phone that incorporates a wide-angle camera.

  2. Description of the Related Art Conventionally, an intercom device that has a camera for capturing a visitor on an entrance phone and configured so that the visitor can be seen from a living room master machine and has a crime prevention function has been widely used. In the case of an interphone device equipped with such a camera, since a visitor does not always stand in front of the camera, there is a device equipped with a new function so that the camera can reliably image the visitor.

  For example, in Patent Document 1, when a message is stored in the room master unit and a call is made from the door phone slave unit (entrance slave unit), the stored message “Please stand in front of the door phone slave unit” is stored in the entrance slave unit. The system automatically reported the sound and encouraged the visitor's movement to ensure imaging. Also, in Patent Document 2, a camera is provided with a pan / tilt mechanism, and its operation unit is provided in the base unit of the living room. If the visitor is out of the angle of view of the camera, the camera is directed toward the visitor by the operation of the resident. The visitors were able to be confirmed.

JP 2002-204315 A JP 2001-157093 A

  However, in the above-mentioned conventional entrance cordless handset, the message is reported regardless of the standing position of the visitor, so the message is reported even when standing in front of the camera. Some people felt uncomfortable. Also, panning / tilting the camera requires a mechanism to control it, which is expensive, and it is difficult to cover all the blind spots, and visitors can always take images by panning / tilting operations. Not always.

  Therefore, a configuration is possible in which a wide-angle camera is used so that a visitor can always be imaged regardless of the standing position of the visitor and without performing pan / tilt operation, but depending on the standing position of the visitor. Therefore, in order to be able to image a visitor without fail, it is necessary to have an angle of view close to 180 ° (capable of capturing an image in the left-right direction close to 180 °).

  However, unlike the surveillance camera, the entrance unit mainly has calling and calling functions, the camera is only an accessory, and a calling function such as a speaker and a microphone is provided around the camera. Located in the flat front of the machine case. For this reason, when the camera is changed to a camera capable of wide-angle imaging, the entrance child device case around the camera is likely to be reflected, and there is a problem that the function of the camera cannot be fully exhibited. In order to solve this problem, it is conceivable to arrange the camera independently of the calling / calling function unit, but this naturally increases the cost.

  Therefore, in view of such problems, the present invention is equipped with a wide-angle camera, so that a message is not reported or a pan / tilt mechanism is not provided, and a front door case or configuration is not significantly changed. The object is to provide an entrance phone of an intercom device that can reliably image a visitor.

In order to solve the above-mentioned problems, the invention of claim 1 is an entrance device of an interphone device having a function for a visitor to call a resident and make a call, and has a camera for imaging the visitor. The camera body is placed in the entrance unit case, and the front end of the entrance unit case is not reflected on the front side of the entrance unit case, even if wide-angle imaging is performed at 180 degrees left and right. Ri formed are arranged to be a predetermined amount of projection from the front, provided with a camera cover for the front of the entrance door station casing to protect the camera, the camera cover has a dome-shaped portion to cover the protruding lens, dome The portion has a concave lens structure in which the center of curvature of the inner curved surface is disposed in front of the center of curvature of the outer curved surface .
According to this configuration, even when an ultra-wide-angle camera having an angle of view of approximately 180 ° is mounted, it is possible to eliminate the entrance unit case from being reflected. Therefore, it is possible to display the visitor video on the monitor of the living room master by demonstrating the function of the camera, and the captured video is easy to see because the entrance cordless handset is not reflected on the monitor video. In addition, it is possible to configure the present invention with a slight change by simply projecting the camera lens forward with respect to the configuration of the conventional entrance cordless handset. And increase in cost can be suppressed.

In addition, the camera can be protected from rainwater and the like, and the situation in which the angle of view of the camera changes greatly due to the camera cover can be prevented. In addition, by setting the curvatures of the front and back to be constant, it is possible to minimize the distortion of the captured image due to the camera cover being attached.

The invention of claim 2 is the invention of claim 1 , wherein the radius of curvature (R1) of the inner curved surface and the radius of curvature (R2) of the outer curved surface are:
R2>R1> (13/17) R2
It has the relationship of these.
According to this configuration, it is possible to prevent a situation in which the angle of view of the camera is further widened by the camera cover, the entrance case is reflected, and the captured image is greatly distorted.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the front end of the lens of the camera protrudes from the front surface of the entrance unit case by 2.0 to 3.5 mm.
According to this configuration, the projecting amount of the camera is small, and a wide-angle camera can be mounted without greatly changing the entrance unit.

  According to the present invention, even when an ultra-wide-angle camera having an angle of view of approximately 180 ° is mounted, it is possible to eliminate the entrance unit case from being reflected. Therefore, it is possible to display the visitor video on the monitor of the living room master by demonstrating the function of the camera, and the captured video is easy to see because the entrance cordless handset is not reflected on the monitor video. In addition, it is possible to configure the present invention with a slight change by simply projecting the camera lens forward with respect to the configuration of the conventional entrance cordless handset. And increase in cost can be suppressed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. 1 to 3 show an example of an entrance child machine according to the present invention. FIG. 1 is a perspective view with a camera cover separated, FIG. 2 is a side view, and FIG. 3 is a partial perspective view with a camera cover attached. is there. In each figure, 1 is an entrance terminal case, 2 is a call button for calling a resident, 3 is a microphone unit containing a microphone for talking, 4 is a speaker unit containing a speaker for talking, A camera cover 6 is a camera. The call button 2, the microphone unit 3, the speaker unit 4, and the camera 6 are arranged on the front surface of the front door case 1 that is formed substantially flat.

The camera cover 5 is formed of transparent acrylic, and a dome-shaped portion 5a protruding in a dome shape is provided at the center. The dome-shaped portion 5a is a lens housing portion from which the camera 6 protrudes, and a flat portion extends around the lens, and the entire shape is rectangular.
4 shows the camera cover 5, FIG. 4 (a) is a front view, and FIG. 4 (b) is a cross-sectional view taken along the line BB. As shown in FIG. 4, the curvature center position C1 of the inner curved surface of the dome-shaped portion 5a is different from the curvature center position C2 of the outer curved surface, and the center of the inner curved surface is arranged in front of the center of the outer curved surface. The center C1 of the inner curved surface is arranged 1.45 mm ahead of the center C2 of the outer curved surface.
The radius R1 of the inner curved surface is smaller than the radius R2 of the outer curved surface. Specifically, the radius R1 of the inner curved surface is 13.5 mm, and the radius R2 of the outer curved surface is 17 mm.

  The dome-shaped portion 5a is formed with a diameter of 23 mm, the end of the dome-shaped portion 5a outside the angle of view of the camera 6 has a small curvature (R = 3.5), and the contact surface with the case 1 is widened. Yes.

On the other hand, FIG. 5 is a cross-sectional explanatory view taken along line AA shown in FIG. 6a is a lens of the camera 6, 6b is a camera body, M is a center line of the camera 6, and faces the front direction of the front door which is an imaging direction. In FIG. 5, the front surface of the front door is faced up.
The camera body 6b is housed in the entrance child device case 1, and the lens 6a is disposed so as to protrude from the front surface of the entrance child device case 1 by D1. Specifically, the front end of the lens 6a is mounted so as to protrude 3 mm (= D1) from the front surface of the case. The distance D2 between the lens 6a and the camera cover 5 is 1 mm.

Next, a description will be given of how light is transmitted through the camera cover 5 and incident on the camera 6 in the thus configured entrance cordless handset. FIG. 6 is an explanatory diagram of light refraction. When light is incident from a medium with a refractive index n1 to a medium with a refractive index n2, it is known that the following relationship is established when the incident angle is θ1 and the refractive angle is θ2. It has been.
n1 × sin θ1 = n2 × sin θ2 (where n1 <n2)
Since the refractive index of air n1 = 1 and the refractive index of acrylic forming the camera cover 5 are n2 = 1.49, this relational expression is as follows.
1 × sin θ1 = 1.49 × sin θ2 (Expression 1)

  Although the camera 6 incorporated in the entrance cordless device of the present invention is considered to be a 180 ° camera capable of imaging from the center line M to the 90 ° direction, an assembly error that occurs when the camera 6 is assembled in the entrance cord case 1 is considered. Considering the above, it is desirable that the entrance terminal case 1 is not reflected even when the 100 ° direction is imaged.

Therefore, here, based on Equation 1, the refraction of light when the direction of light incident on the camera lens 6a is 100 ° from the camera center line M will be seen. FIG. 7 is an explanatory diagram of this case, and shows the refraction of light incident on the camera lens 6a from the direction of 100 °. The light L incident from the outside passes in the order of air → acryl → air, and enters the lens end portion at 100 °.
J1 is the normal of the inner curved surface of the dome-shaped portion 5a through which the light L passes, and J2 is the normal of the outer curved surface of the dome-shaped portion 5a through which the light L passes. P1 is a boundary point on the inner surface of the dome-shaped portion 5a where light is refracted, and P2 is a boundary point on the outer surface.

First, in the case of the present embodiment, the limit angle θM at which the entrance device case 1 is not reflected is the positional relationship between the lens 6 a and the front surface of the entrance device case 1. From the explanatory diagram, it can be seen as an angle of 95 ° (= θM) from the center line M. Considering the case where the incident angle of light at the lens end of the camera 6 is 100 ° with reference to this, the inner curved surface incident angle θ1 of the dome-shaped portion 5a is 67.7 ° in this case. Since it is known from the shape of the part 5a, the following numerical values are obtained when the inner curved surface refraction angle θ2, the outer curved surface incident angle θ3, and the outer curved surface refraction angle θ4 are obtained from these numerical values. However, the light L incident on the camera 6 is in the opposite direction.
θ2 = 38.3 °, θ3 = 35.1 °, θ4 = 59.2 °

  As shown in FIG. 5A, the distance from the center line M to P1 is 7.21 mm, and the distance from the center line M to P2 is 9.86 mm.

  This θ4 = 59.2 ° is 94.6 ° with respect to the camera center line M. Although this result is an angle larger than the horizontal line of the entrance case 1, it does not reach the limit value θM = 95 °, so even if there is an angle of view of the camera 6 up to that angle, the entrance handset It can be seen that Case 1 is not reflected in the last minute.

Thus, by making the camera cover into the shape described above, even when light is incident from a direction of 100 ° from the front of the camera, the entrance unit case is not reflected. Therefore, even if an ultra-wide-angle camera having an angle of view of about 180 ° is mounted, the entrance unit case does not appear. Therefore, it is possible to display the visitor video on the monitor of the living room master by using the function of the camera, and it is easy to see the captured video because the entrance cordless handset is not reflected on the monitor video.
In addition, it is possible to configure the present invention with a slight change by simply projecting the camera lens forward with respect to the configuration of the conventional entrance cordless handset. And increase in cost can be suppressed.

Furthermore, since the dome-shaped part of the camera cover has a concave lens structure, it is possible to prevent a situation in which the angle of view of the camera is narrowed by the camera cover, and by making the front and back have a constant curvature, The distortion of the captured image can be minimized.
In addition, the amount of projection to the front of the camera is small, and a wide-angle camera can be mounted without greatly changing the entrance unit.

The relationship between the inner curved surface curvature R1 and the outer curved surface curvature R2 of the dome-shaped portion 5a is R1 <R2, but if this ratio exceeds a certain value, the angle of view becomes too wide and the entrance unit case 1 is reflected. In other words, since the distortion of the captured image of the camera 6 becomes large, it is desirable that the range satisfies the following relationship.
R2>R1> (13/17) R2

  Moreover, in the said embodiment, although the lens 6a protrudes 3 mm from the front surface of the entrance child machine case 1, if a camera assembly | attachment error is small, even if the protrusion amount is about 2.0 mm, reflection can be prevented. On the other hand, if the projection amount of the lens is large, it is possible to prevent the entrance device case 1 from being reflected even if an image is taken up to an angle exceeding 180 °. However, since the entrance device is usually installed on the wall surface, If there is an angle of view, the blind spot can be sufficiently eliminated, and a protrusion amount of 3.5 mm is sufficient.

It is a perspective view which shows an example of the front door apparatus of the intercom apparatus which concerns on this invention. It is a left view of FIG. It is a fragmentary perspective view equipped with the camera cover. (A) is a front view of a camera cover, (b) is a BB sectional drawing. (A) is AA sectional view explanatory drawing, (b) is the E section enlarged view. It is explanatory drawing regarding refraction of light. It is explanatory drawing of refraction of the light which injects into a camera.

Explanation of symbols

  1. Entrance case, 5. Camera cover, 5a. Dome shape, 6. Camera, 6a lens.

Claims (3)

An entrance device for an interphone device having a function for a visitor to call a resident and make a call, and equipped with a camera for imaging the visitor,
The main body of the camera is disposed in the entrance cordless device case, and the front end of the entrance cordless device case is not reflected even when a wide-angle imaging of 180 degrees on the left and right is performed. Ri formed are arranged to be a predetermined amount of projection from the front of the case,
A camera cover for protecting the camera is installed on the front of the entrance case.
The camera cover has a dome-shaped portion that covers the protruding lens, and the dome-shaped portion has a concave lens structure in which the center of curvature of the inner curved surface is disposed forward of the center of curvature of the outer curved surface. An intercom device entrance cordless handset. The radius of curvature (R1) of the inner curved surface and the radius of curvature (R2) of the outer curved surface are:
R2>R1> (13/17) R2
2. The intercom device of the intercom apparatus according to claim 1, wherein Entrance door station intercom device according to claim 1 or 2, wherein the comprising 2.0~3.5mm is protruded to the front of the lens of the camera from the front the entrance door station case.

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