JPH0418300Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a near-infrared video door intercom system that makes visitors who are photographed unaware of the illumination light, and is particularly applicable to cordless handsets installed at entrances. Regarding improvement of case structure.

[Prior Art] FIG. 4 shows a typical example of a conventional structure of an entrance handset of a near-infrared video door intercom system.

The case of the handset is constructed by combining a box-shaped front panel 1 that covers the front side and a box-shaped back panel 10 that covers the back side. A window hole is formed in the center of the front panel 1,
The window hole is covered with a near-infrared filter 2 mounted here.

Inside the case, a camera unit 3 and a board 4 are fixed with screws 5, and an infrared light emitting lamp 6, a reflector plate 7, etc. are attached to the board 4. Although not shown, peripheral circuits for the camera unit 3 and lamp 6, and a communication device (speaker and microphone) for communication with the base unit are built into the case. In addition,
8 is a call button, and Natsuto 9 presses it on the front panel 1.
is fixed.

Near-infrared rays from a lamp 6 are irradiated to the outside through a filter 2, and the reflected light is received by a camera unit 3 through the filter 2 to photograph a visitor or the like. The image signal of the camera unit 3 is transmitted to the base unit indoors.

[Problems to be solved by the invention] Since the handset is installed outdoors, such as at a front door, the case must have sufficient drip-proof properties to protect the inside from rainwater.

However, in the conventional case structure described above, since a window is formed in the front panel 1 and the near-infrared filter 2 is attached thereto, there is a problem that rainwater easily enters through the joints in this part. A large amount of cost is required to provide a sufficient seal to this joint, and even if this is done, it is difficult to maintain sealing performance over a long period of time.

This idea was created in view of the above-mentioned conventional problems, and the purpose was to provide a handset for a near-infrared video door intercom system that has a simpler case structure and is highly drip-proof. be.

[Means for solving the problem] Therefore, in this invention, the front panel of the handset case has a shape that covers the entire front side, and has a high transmittance for near-infrared rays and a slight transmittance for visible light. It is integrally molded with plastic as shown, and near-infrared rays are irradiated and photographed through this front panel.

[Function] The front panel integrally molded from the plastic has no seams anywhere, so it exhibits extremely high drip-proof properties.

[Embodiment] FIGS. 1 and 2 show the structure of a handset according to an embodiment of this invention.

The case of this handset consists of a box-shaped front panel 1 that covers the front side and a box-shaped rear panel 10 that covers the back side.
It is constructed by combining the following.

The front panel 1 is integrally formed of plastic that exhibits high transmittance for near-infrared rays and approximately 7% transmittance for visible light.

A camera unit 3, a board 4, a near-infrared light emitting source 20, a speaker 17 and a microphone 18 of a communication device, and an interface circuit for connecting these peripheral circuits and a base unit are built into the above-mentioned case.
Further, a call button 8 is fixed to the front panel 1 with a nut 9.

The optical axis of the lens of camera unit 3 is the front panel 1.
The light emitting source 20 is arranged close to the periphery of the lens barrel inside the front panel 1. An infrared light emitting diode is used as the light source 20, and near-infrared rays are irradiated to the outside through the front panel 1, and the reflected light enters the camera unit 3 through the front panel.

As shown in FIG. 3, the handset is connected to the indoor base unit 12 via a video signal cable 13, a telephone call cable 14, and a power supply cable 15. When the visitor presses the call button 8, the base unit 12
is activated, the camera unit 3 and the light emitting source 20 operate with power supplied from the main unit 12, and the visitor is photographed by irradiation with near-infrared rays. The image is displayed on the monitor unit 16 of the base unit 12. Further, a communication can be made between a communication device using a speaker 17 and a microphone 18 and a handset 19 of the base unit 12.

[Effects of the invention] As explained in detail above, in this invention, the front panel of the handset case is made of integrally molded plastic, and the plastic has high transmittance for near-infrared rays and high transmittance for visible light. The case structure uses a material that exhibits some transmittance, and near-infrared rays are irradiated and photographed through this front panel, so there are no eyelid seams on the front panel, ensuring complete drip-proof properties over a long period of time. can be maintained. Also, since the front panel allows some visible light to pass through, the three-dimensional effect of the photographed image is improved compared to when only near-infrared light is used.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a handset according to an embodiment of the present invention, Fig. 2 is a front view of the above handset, Fig. 3 is a system diagram connecting the handset and the main unit, and Fig. 4 is a FIG. 2 is a vertical cross-sectional view of a conventional slave unit. In the figure, 1 is a front panel, 3 is a camera unit, 4 is a board, 8 is a call button, 17 is a speaker, 18 is a microphone, and 20 is a light source.
Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A light emitting source for irradiating an object with near-infrared rays and photographing the object using the reflected light, a camera unit, their peripheral circuits, and a communication device are built into a drip-proof case, and the front side of the case is A front panel that covers the entire side is integrally molded with plastic that has high transmittance for near-infrared rays and a slight transmittance for visible light, and near-infrared rays are irradiated and photographed through this front panel. A handset for a near-infrared video door intercom system featuring: