JP5841861B2 - Entrance door unit of TV door phone system - Google Patents

Description

  The present invention relates to an entrance phone of an interphone system, and more particularly, to an entrance phone of a TV door phone system in which a camera is provided in the entrance phone and the status of the entrance can be confirmed on a monitor of a living room master.

Due to the growing need for crime prevention, when a visitor calls, the visitor is imaged with the camera of the entrance cordless handset, and the image is displayed on the monitor of the living room master unit. TV doorphone systems that have a function to record a visitor while away and to check on a monitor after returning home are widely used.
In recent years, in order to eliminate the blind spot of the camera, a TV door phone system has been introduced that can capture images with a wide-angle lens with an angle of view of 180 ° or more, and electronically zoom in and pan / tilt where you want to see. (For example, refer to Patent Document 1).

  FIG. 5 shows a cross-sectional explanatory view of a conventional entrance cordless handset provided with a wide-angle lens, and shows a cross section of the camera unit. In FIG. 5, reference numeral 31 denotes a lens of the camera 30, 32 denotes a lens cover for protecting the lens, and 33 denotes a case of the entrance unit. As shown in FIG. 5, the lens 31 protrudes from the front surface of the case 33, and the lens cover 32 is formed in an arc shape in front of the lens cover 32.

JP 2010-93648 A

In this type of camera having an angle of view of 180 degrees or more, it is necessary to make the lens zenith protrude from the surface position of the entrance unit case 33 in order to prevent the entrance unit case 33 from being reflected. Therefore, as shown in FIG. 5, the lens cover 32 has a shape that protrudes greatly to the front, and is easily damaged. This causes deterioration of the image quality such as reducing the resolution of the camera 30.
In addition, the camera 30 installed in a place where sunlight rays can easily hit like an entrance cordless handset, the reflection of sunlight generated at the interface of the lens cover 32 causes harmful ghosts and flares, and further improves the image quality. It was deteriorating.

  Therefore, in view of such problems, the present invention can reduce harmful flare and ghost even when directly exposed to sunlight, and can ensure the visibility of camera-captured video displayed from the monitor of the parent device. The purpose is to provide the entrance machine for the system.

In order to solve the above-mentioned problem, the invention of claim 1 has a call button for calling a resident and a camera for imaging a visitor. The door unit of the TV door phone system that transmits a calling signal to the projector and transmits a captured image of the camera, wherein the lens unit of the camera has a plurality of lenses that capture a wide-angle area with an angle of view of 180 degrees or more. A lens arranged at the forefront of the wide-angle lens group, comprising a wide-angle lens group comprising: a lens barrel that supports the wide-angle lens group; and a lens holder that supports the lens barrel to the case of the entrance unit The lens cover is also arranged to be exposed from the camera window of the case and serves as a lens cover, and has a contact piece for forming a waterproof structure with an elastic member between the lens frame and the case around the camera window. , And further the lens barrel and the lens holder, while being connected by screwing each other with a screw groove, contact piece and wherein a periodic roughness around the sides is formed in a disk shape To do.
According to this configuration, since the camera lens is fixed in a state of being exposed from the case, ambient light is directly incident on the lens, and flare and ghost are not generated even if the light is from the side. A clear image can be output even if it is a side image. Further, the camera window can be sealed with an elastic member and a contact piece, and there is no risk of rainwater or the like even without a lens cover.
Furthermore, by rotating and changing the screwed state between the lens barrel and the lens holder, the axial length of the lens can be changed, and focus adjustment can be performed. And this rotation operation can be smoothly implemented using the periodic unevenness | corrugation formed in the outer periphery of the contact | adherence piece.

  The lens placed in the forefront of the lens unit has sufficient strength if it is a glass lens, so it is difficult to be damaged even without a cover. Even if it is a plastic lens, recent surface processing technology has improved. Sufficient strength can be obtained, and even if there is no cover, it is difficult to be scratched. By using such a lens, the cover can be eliminated.

The invention of claim 2 is the structure of claim 1, the adhesion piece is larger than the outer diameter of the lens mirror frame tip exposed, characterized in that it comprises are formed by the size of at least 20 mm.phi.
According to this configuration, since the contact piece has a large diameter, the contact surface is wide and a sufficient contact area can be secured, and the rotation operation is easy.

  According to the present invention, since the camera lens is fixed in a state of being exposed from the case, ambient light is directly incident on the lens, and even if the light is from the side, flare and ghost are not generated and the camera lens is clear. Can be captured with video. Further, the camera window can be sealed with an elastic member and a contact piece, and there is no risk of rainwater or the like even without a lens cover.

It is a front view which shows an example of the entrance cordless handset which concerns on this invention. It is AA sectional view explanatory drawing. It is a B section enlarged view. The lens barrel which accommodated the lens is shown, (a) is a top view, (b) is a side view. It is a section explanatory view of the conventional entrance cordless handset.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an example of a front door unit of the TV door phone system according to the present invention. The front door unit 1 includes a call button 2 for calling a resident, and a camera 3 for imaging a visitor. A microphone 4 and a speaker 5 for making a call are provided inside the case 6.
The TV door phone system is composed of the entrance cordless handset 1 installed outside the entrance and the like, and a living room base unit (not shown) installed in the dwelling unit to respond to calls.

  2 is a cross-sectional explanatory view taken along the line AA in FIG. 1, FIG. 3 is an enlarged view of a portion B, and shows a cross section of the camera 3. The camera 3 includes a lens unit 10, an image sensor 11, a memory, a DSP (not shown), and the like. The lens unit 10 includes a lens group 12 including a plurality of lenses, and a lens that houses and supports the lens group 12. The lens frame 13 and the lens holder 14 for fixing the lens frame 13 are configured.

The lens group 12 is a wide-angle lens group with an angle of view of 180 degrees or more, and the camera 3 is a wide-angle camera that captures a range of 180 degrees or more. Then, the output signal from the image sensor 11 is stored in the memory, and distortion is corrected by the DSP, and a desired image is sent to the room master.
The lens holder 14 has a screwing hole 14 a and is fixed to the substrate 16 by a screw 15.

  The lens barrel 13 has a lens housing portion 13a formed in a cylindrical shape, and a gap between the camera window 17 formed in the case 6 is hermetically sealed around the vicinity of the tip portion to prevent intrusion of rainwater. A close contact piece 13b is provided in a flange shape. The contact piece 13b is formed in a plate shape, and a ring-shaped elastic member 18 is disposed on the front surface thereof and brought into close contact with the back portion of the case 6, whereby the opened camera window 17 is hermetically sealed. An annular protrusion 19 protruding rearward is formed on the back surface of the camera window 17 of the case 6 to ensure the close contact of the elastic member 18.

  4A and 4B show a lens barrel 13 containing the lens group 12, in which FIG. 4A is a plan view and FIG. 4B is a side view. As shown in FIG. 4, the diameter W2 of the contact piece 13b is formed to be larger than the tip diameter W1 exposed from the case 6 of the lens barrel 13, and is further periodically cut on the peripheral side portion of the contact piece 13b. A notch 13c is formed. Specifically, the front end diameter W1 of the lens barrel 13 is 16 mmφ, the diameter W2 of the contact piece 13b is 23 mmφ, and the notches 13c are formed at equal intervals of 45 °.

  Further, the lower part of the contact piece 13b on the image pickup device 11 side of the lens barrel 13 is provided with a thread groove to form a male screw portion 13d. On the other hand, a female screw (not shown) is formed on the lens holder 14 facing the male screw portion 13d, and the lens holder 14 and the lens barrel 13 are screwed and connected. Thus, the lens holder 14 holds the lens barrel 13 by screwing, thereby enabling focus adjustment.

In this way, by increasing the diameter W2 of the contact piece 13b with respect to the tip diameter W1 of the lens barrel 13, a sufficient contact area with the case 6 is ensured, and the lens barrel 13 can be rotated. It is easy to do. In particular, by providing the notch 13c at every 45 ° on the outer periphery of the contact piece 13b, the rotary tool can be easily engaged, the focus can be easily adjusted, and the automatic adjustment function can be easily expanded.
The relationship between the diameter W1 of the lens barrel 13 and the diameter W2 of the contact piece 13b is such that the gap of the camera window 17 can be hermetically sealed if W2 is larger than W1, but the diameter W2 of the contact piece 13b is If it is 20 mmφ or more, it is easy to rotate and the adhesion of the elastic member 18 is good, which is convenient.

As shown in FIG. 2, the case 6 of the entrance unit 1 is composed of an upper case 6a that forms the front side of the entrance unit 1 and a lower case 6b that forms the back side that is the wall side. When the fixed substrate 16 is assembled to the upper case 6a, the foremost lens 12a (shown in FIG. 3) of the lens group 12 is exposed from the camera window 17 of the upper case 6a, and further the lower case 6b is assembled. Thus, the elastic member 18 is compressed by the contact piece 13b and the upper case 6a, and the airtightness of the camera window 17 is maintained.
The frontmost lens 12a is a plastic lens having a high surface strength by surface processing. Reference numeral 7 denotes a base, which is used when the case 6 is exposed and installed on a wall surface.

As described above, the front lens 12a of the lens group 12 of the camera 3 is fixed in a state of being exposed from the case 6, so that ambient light is directly incident on the lens and flare even from the side. No ghosting occurs, and a clear image can be output even when the image is on the side of the camera 3, and the visibility of the monitor of the parent device can be improved.
Further, the camera window 17 can be sealed by the elastic member 18 and the contact piece 13b, and there is no risk of intrusion of rainwater or the like without the lens cover, and the screwed state between the lens barrel 13 and the lens holder 14 is rotated. Since the axial length of the lens group 12 can be changed, focus adjustment can be performed.
Further, this rotation operation can be smoothly performed by using periodic irregularities formed on the outer periphery of the contact piece 13b, and the contact piece 13b has a large diameter, so that it is easy to rotate and has a wide contact surface and sufficient contact. An area can be secured.

  In the above embodiment, the contact piece 13b is formed as a flat surface. However, the contact surface of the elastic member 18 is provided with irregularities in a ring shape around the optical axis of the lens in accordance with the annular protrusion 19 provided in the case 6. Thus, the adhesion of the elastic member 18 may be further increased. Moreover, although the contact piece 13b is formed in a disc shape, it may be rectangular or polygonal.

  1 .. Entrance cordless handset, 2 .. Call button, 3 .. Camera, 6 .. Case, 10 .. Lens unit, 12 .. Lens group (wide-angle lens group), 12 a. Lens lens frame, 13b, contact piece, 13c, notch, 14 lens holder, 17 camera window, 18 elastic member

Claims (2)

A call button for calling a resident and a camera for imaging a visitor. When a call operation is received, a call signal is transmitted to a room base unit installed in the dwelling unit, and the camera is imaged. A door phone system of a TV door phone system that transmits video,
The lens unit of the camera includes a wide-angle lens group composed of a plurality of lenses that captures a wide-angle area with an angle of view of 180 degrees or more, a lens barrel that supports the wide-angle lens group, and the lens barrel that is used as an entrance unit. It consists of a lens holder for supporting the case,
The lens disposed at the forefront of the wide-angle lens group is disposed to be exposed from the camera window of the case serving as a lens cover, and the lens barrel is elastic between the case around the camera window. comprising a contact piece for forming a waterproof structure via,
Further, the lens barrel and the lens holder are connected to each other by screwing with screw grooves, while the contact piece is formed in a disk shape and has periodic unevenness on the peripheral side portion. This is an entrance cordless handset of the TV door phone system. The adhesion piece is larger than the outer diameter of the lens mirror frame tip exposed, the entrance door station of claim 1, wherein the TV door system characterized by comprising formed in size of at least 20 mm.phi.

Images