JP2001285855A - Door monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door monitor by which a visitor is largely projected on a liquid crystal display even when the visitor is standing at a position deviated from the optical axis of a door scope with respect to the door monitor for projecting the visitor on the liquid crystal display from a door scope hole arranged in a door by combining a CCD camera with the liquid crystal display. SOLUTION: This door monitor is characterized by permitting the lens part of the CCD camera to be freely rotatable and arranging the optical axis of a lens disposed in the lens part to be deviated from the rotary axis of the lens part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door monitor which comprises a combination of a CCD camera and a liquid crystal display, and which can be attached to a door of a front door so that visitors can be checked from inside.

[0002]

2. Description of the Related Art Conventionally, a CCD camera and a liquid crystal display are combined, and a CCD is mounted on a door scope provided on a door.
Door monitors in which a camera is arranged have been proposed, for example, Japanese Patent Application Laid-Open Nos. 11-215485 and 11-27.
No. 0248, etc. Such a door monitor utilizes a lens of a door scope already provided on the door, and arranges a lens of a CCD camera of the door monitor on the same optical axis as this, thereby attracting visitors on a liquid crystal display of the door monitor. By displaying the image, it is not necessary to look into the scope to confirm the visitor unlike a conventional door scope, and the visitor can be easily confirmed by looking at the liquid crystal display from a remote place. Further, since the existing door scope hole is closed by the CCD camera, there is no need to worry about looking into the room from outside through the door scope hole.

[0003]

In a door monitor of this type, it is desirable that a visitor be largely displayed on a liquid crystal display in order to identify the visitor.

[0006] However, as shown in FIG. 6, in order to make a visitor appear larger on the liquid crystal display, if the cut-out range by the CCD camera is reduced within the photographable range defined by the lens of the door scope, the visitor is visited. If the user stands at a position deviated from the optical axis of the doorscope lens, there is a problem that the visitor is not displayed on the liquid crystal display. Conversely, when the shooting range is widened, the number of visitors projected on the liquid crystal display becomes small, so that identification becomes difficult. In addition, the same problem occurs when the focal length of the lens of the door scope is changed to narrow the photographable range in order to project a visitor on the liquid crystal display in a large size.

Accordingly, the present invention provides a door monitor which can display a large image on a liquid crystal display even when a visitor stands at a position shifted from the optical axis of the door scope.

[0006]

According to the present invention, there is provided a door monitor for combining a CCD camera and a liquid crystal display, wherein the CCD camera displays a visitor on the liquid crystal display. The lens unit is rotatable, and an optical axis of a lens provided in the lens unit is arranged eccentrically from a rotation axis of the lens unit.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 3 show a first embodiment of a door monitor according to the present invention. FIG. 1 is a perspective view showing a state of being attached to a door, and FIG. 2 is an exploded perspective view thereof. ,
FIG. 3 is a perspective view showing the inside of the door monitor main body.

1 to 3, (1) is a door monitor main body, (2) and (3) are front and rear cases of the door monitor main body (1), (4) is a door, and (5) is an optical type. With the receiving screw of the door scope, the rear case (2) is fixed to the door (4) by being sandwiched between the receiving screw (5) and a lens-side screw (not shown) of the door scope.

The door monitor body (1) has a liquid crystal display (11), an operation switch (12), and a CCD camera (1).
3), batteries (14), (14), a drive circuit and the like (not shown) are incorporated. Note that the CCD camera (13) is disposed to face the receiving screw (5) of the door scope, and photographs a visitor through a lens (not shown) of the door scope.

FIG. 4 shows a CCD according to an embodiment of the present invention.
FIG. 4 shows a sectional view of a lens portion of the camera (13). CCD camera
The lens part (15) of (13) is rotatable by electric or manual operation, and the optical axis A of the lens (16) is arranged eccentrically from the rotation axis B of the lens part (15). Also,
The rotation axis B of the lens unit (15) coincides with the optical axis of a lens (not shown) of the door scope. In addition, CCD camera (13)
Although not shown, the light receiving element is disposed behind the lens portion (15) so as not to rotate.

In such a configuration, when the lens section (15) of the CCD camera (13) is rotated, as shown in FIG. 5, the CCD camera (13) falls within the photographable range defined by the lens of the door scope. The range cut out by 13) (that is, the display range on the liquid crystal display) moves along the arrow in the drawing. Therefore, the display position can be appropriately changed according to the position where the visitor stands in front of the door, and the visitor can be displayed in a large size.

Further, in the present invention, it is possible to correct even if the installation accuracy of the door scope lens or the CCD camera lens with respect to the door scope hole is shifted.

In this embodiment, the light receiving element of the CCD camera (13) is fixed, but it may be provided so as to revolve in accordance with the rotation of the lens unit.

(Embodiment 2) FIG. 7 shows a second embodiment of the present invention. In this embodiment, the monitor camera unit (20) and the monitor display unit (21) are separately connected by a cable (22), and the monitor camera unit (20) is installed outside the door or on the wall of the entrance. The monitor display section (21) is installed indoors. Incidentally, (23) in the figure is a shooting window in which a CCD camera (not shown) is built in, (24) is a liquid crystal display, (25)
(25) is a microphone / speaker.

FIG. 8 is a partial cross-sectional view of the photographing window (23) of the monitor camera section (20) of the present embodiment. The lens section (15) of the CCD camera has the same structure as in the first embodiment and rotates. The optical axis A of the lens (16) is free to rotate,
Eccentric from. In the present embodiment, a wide-angle lens (26) is provided in the imaging window (23), and its optical axis coincides with the rotation axis B of the lens unit (15).

In this embodiment, as in the first embodiment,
By rotating the lens unit (15), the display position can be changed as appropriate, and the visitor can be projected greatly.

[0018]

According to the door monitor of the present invention, C
By rotating the lens part of the CD camera, the range displayed on the liquid crystal display can be changed as appropriate, so even if the visitor stands at a position shifted from the optical axis of the door scope, the visitor on the liquid crystal display Can be projected greatly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a door monitor according to a first embodiment of the present invention is attached to a door.

FIG. 2 is an exploded perspective view of the door monitor according to the first embodiment.

FIG. 3 is a perspective view showing the inside of a door monitor main body.

FIG. 4 is a sectional view of a lens portion of the first embodiment.

FIG. 5 is a diagram showing a display range of a liquid crystal display according to the present invention.

FIG. 6 is a diagram showing a display range of a liquid crystal display in a conventional device.

FIG. 7 is a perspective view showing a door monitor according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a photographing window and a lens portion according to a second embodiment.

[Explanation of symbols]

 1 Door monitor body 11 LCD display 13 CCD camera 15 Lens section 16 Lens

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2H044 AC02 2H087 KA25 5C022 AA06 AC03 AC27 AC42 AC54 AC72 AC73 AC74 5C054 AA05 CA04 CC02 CD06 CE04 CE04 CE14 CF05 EA01 EA05 FA02 HA18

Claims (3)

[Claims] 1. A door monitor in which a CCD camera and a liquid crystal display are combined and the CCD camera projects a visitor on the liquid crystal display. A lens portion of the CCD camera is rotatable and provided on the lens portion. A door monitor, wherein an optical axis of a lens to be provided is decentered from a rotation axis of the lens unit. 2. The door monitor according to claim 1, wherein a wide-angle lens is provided in front of a lens portion of the CCD camera. 3. The door monitor according to claim 2, wherein the wide-angle lens is a lens of a door scope already provided on a door.