JP2593849B2 - Door phone cord with night vision camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a door phone handset with a night-vision camera provided with a night-vision camera for monitoring a visitor.

[Background Art] Conventionally, in a door phone handset with a night-vision camera provided with a night-vision camera for monitoring a visitor of this kind, an opening is formed in the front part of the night-vision camera 2 of the housing 3 as shown in FIG. A light transmitting cover 25 'is attached to the opening. In this type of door phone handset, black silk printing is applied to the translucent cover 25 'except for the camera unit in order to give priority to image quality. For this reason, only the camera portion of the light-transmitting cover 25 'becomes transparent, and it is apparent to the visitor that the monitor is performed by the night-vision camera 2, which causes a problem of giving the visitor discomfort.

Therefore, conventionally, as shown in FIG. 5, a light-transmitting cover 2 having a filter characteristic of transmitting limited visible light and near-infrared light.
The presence of the night-vision camera 2 was made inconspicuous by using a 5 ". However, since the light-transmitting cover 25" cuts a certain wavelength or less in the visible light region as shown in FIG. There was a problem that the reflection was unnatural.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a door phone handset with a night-vision camera, which can prevent the presence of a camera without deteriorating image quality. Is to do.

[Disclosure of the Invention] (Embodiment) Figs. 1 to 3 show an embodiment of the present invention. First, the overall configuration of the present embodiment will be described. still,
The overall configuration is the same as that of the conventional example shown in FIG.
Description will be made with reference to the drawings. The housing 3 constituting the exterior of the door phone slave unit is composed of a cover 7, a body 8, a base 9, a terminal fitting 10, a terminal screw 11, and a push button 12. Inside the housing 3, the night vision camera 2 and visitors , And a door phone unit 4 including a speaker 6 and a microphone 43. The night-vision camera 2 is formed by integrally fixing an optical unit 13 such as a lens block (not shown) and a light-transmitting cover 25 ″ and a printed circuit board 14 on which a solid-state image sensor is mounted with screws 16 via a spring 15. The spring 15 is for maintaining a proper distance between the optical unit 13 and a solid-state image sensor (not shown) such as a CCD on the printed circuit board 14.
An infrared light emitting diode 18 for illumination is soldered to a printed board 17 disposed on the side of the optical unit 13, and the printed board 17 is also fixed to the optical unit 13 by the screws 16. Next, the speaker 6 of the door phone unit 4 is heat-fixed to the cover 7 via a waterproof packing 19. In the center of the lower part of the door phone unit 4, there is provided a push button 12 having a light emitting diode 32 which is turned on when pressed and displays the pressed state. The switch 5 mounted on the printed circuit board 21 for the door phone circuit
Is operated by pushing the push button 12 against the spring force of the spring 20 so that the rib 22 of the push button 12 pushes the operation button 23 of the switch 5. It is fixed to. Further, the circuit board for the control circuit of the night vision camera 2 is mounted on the side portion of the printed circuit board 21 and the printed circuit board 24. Unlike the case where the vidicon is used, the one using the solid-state image pickup device is optical. Since an image processing circuit (not shown) for processing a signal obtained by the solid-state imaging device separately from the system can be provided, the thickness of the night vision camera 2 can be reduced. Further, the microphone 43 of the door phone unit 4 is arranged on the cylindrical portion of the cover 7. Infrared light emitting diode 18 is an optical system unit
The infrared light emitting diode 18 outputs a pulse signal synchronized with a synchronizing signal used by the image processing circuit of the night vision camera 2 to perform image processing. By intermittently emitting light in synchronization with a synchronization signal, high-brightness light emission without flicker can be achieved.

Hereinafter, the characteristic portions of the present embodiment will be described.
In the present embodiment, an opening is formed in the front part of the night vision camera 2 and the infrared light emitting diode 18 of the cover 7, and a transparent cover 25 formed of acrylic and colored (blue smoke) is formed in the opening. And the infrared light emitting diode 18 excluding the front portion 25a of the night vision camera 2 of the light transmitting cover 25.
The infrared transmitting agent 26 is silk-printed on the front surface 25b of the. Note that, instead of the infrared transmitting agent 26, an infrared filter that cuts light other than infrared light may be attached to the back surface of the light transmitting cover 25. As shown in FIG. 2, the light-transmitting cover 25 has a visible light transmittance of 30%, and does not cut visible light but reduces the amount of visible light transmitted. The translucent cover 25 transmits infrared light well. This makes it possible for the night vision camera 2 to make a natural distinction between black and white, and to reduce the visible light by coloring so that the presence of the night vision camera 2 can be made inconspicuous. Further, as shown in FIG. 3, an infrared transmitting agent 26 that transmits only infrared light is silk-printed on the back surface of the light transmitting cover 25 on the front surface of the infrared light emitting diode 18, so that visible light is completely cut off, The presence of the light emitting diode 18 is completely unknown. In addition, instead of performing silk printing or the like as described above, the night vision camera 2 front portion 25a is formed as a colored filter portion similar to the above-described light-transmitting cover 25, and an infrared light emitting diode is provided.
The light-transmitting cover 25 may be integrally formed with the front portion 25b of the filter 18 as a filter having the same characteristics as the infrared transmitting agent 26.

[Effects of the Invention] As described above, the present invention provides a communication means for a visitor to talk with a housekeeper on the side of a door phone in a room, and a solid-state imaging device for obtaining an image signal which is an electric signal corresponding to the brightness of each part of a subject. A lens block disposed on the front surface of the solid-state imaging device, and a night-vision camera that includes an image processing circuit that processes signals obtained by the solid-state imaging device and performs monitoring using visible light and infrared light, When a visitor is illuminated with infrared light, an infrared light emitting diode is provided in a housing, an opening for a night vision camera and an infrared light emitting diode is formed in the front of the housing, and the front of the night vision camera in this opening is provided. A colored filter that reduces the amount of visible light only is attached to the part, and a filter that transmits only infrared light is attached to the front part of the infrared light emitting diode, so night vision cameras reduce visible light. Since the color filter can be made less visible to visitors by reducing the color filter, and the color filter only reduces the visible light instead of cutting it,
The image does not become unnatural, and the light-transmitting cover on the front part of the infrared light-emitting diode is a filter that transmits only infrared light. Can be made completely invisible to the user, and has the effect of making the visitor aware of the presence of the night-vision camera and eliminating discomfort.

[Brief description of the drawings]

1 (a) is a sectional view of a main part of an embodiment of the present invention, FIG. 1 (b) is a front view of a translucent cover of the above, and FIG. FIG. 3 is an explanatory diagram showing the optical characteristics of the filter portion on the front surface of the infrared light emitting diode, and FIG.
5B is a front view and a side view showing a conventional example, FIGS. 5A and 5B are front views and a cross-sectional view showing another conventional example, and FIG. FIG. 4 is an explanatory diagram showing optical characteristics of the present invention. 2 is a night vision camera, 3 is a housing, 18 is an infrared light emitting diode, 25 is a light-transmitting cover, 25a is a colored filter unit, 25b is a filter unit, and 26 is an infrared transmitting agent.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-5689 (JP, A) JP-A-59-86972 (JP, A) JP-A 47-31210 (JP, U) JP-A 34- 11805 (JP, Y1)

Claims (1)

(57) [Claims] 1. A solid-state image sensor for obtaining an image signal which is an electric signal corresponding to brightness of each part of a subject, a lens disposed on a front surface of the solid-state image sensor. A night-vision camera that consists of a block and an image processing circuit that processes signals obtained by the solid-state imaging device and monitors using visible light and infrared light, and an infrared light-emitting diode that illuminates visitors with infrared light In the housing, a night vision camera and an opening for an infrared light emitting diode are drilled in the front of the housing, and a coloring filter for reducing the amount of visible light only is provided in the front of the night vision camera in this opening. A door phone slave unit with a night-vision camera, which is attached and has a filter that transmits only infrared rays attached to the front surface of the infrared light emitting diode.