JP2552276B2 - Door phone - Google Patents
Door phoneInfo
- Publication number
- JP2552276B2 JP2552276B2 JP62016583A JP1658387A JP2552276B2 JP 2552276 B2 JP2552276 B2 JP 2552276B2 JP 62016583 A JP62016583 A JP 62016583A JP 1658387 A JP1658387 A JP 1658387A JP 2552276 B2 JP2552276 B2 JP 2552276B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting diode
- infrared
- monitor
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000005286 illumination Methods 0.000 claims description 14
- 230000004397 blinking Effects 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Closed-Circuit Television Systems (AREA)
Description
【発明の詳細な説明】 ［技術分野］ 本発明は、モニタカメラ付きのドアホン子器に関する
ものである。TECHNICAL FIELD The present invention relates to an intercom subunit with a monitor camera.
［背景技術］ 従来、この種のモニタカメラ付きのドアホン子器は、
CCD撮像素子、MOS撮像素子などの固体撮像素子を用いた
モニタカメラと、ドアホン回路とで構成されており、モ
ニタカメラで撮影されたモニタ画像をモニタテレビに表
示し、来客を確認するようになっている。また、夜間の
来客に対応するために、第７図に示すように、モニタカ
メラ３の撮像レンズ７の側方に補助照明用の発光ダイオ
ード２を設け、発光ダイオード２から発せられる光を来
客に照射して、その反射光を固体撮像素子１にて検出す
るようにした所謂暗視機能を具備したものがあった。と
ころで、このような従来例において、来客に補助照明光
が照射されていることを認識させないようにするために
可視光透過率が小さく赤外線透過率が大きい赤外線透過
フィルタ６をモニタ窓に装着して可視光をカットしてい
たが、一般に、近赤外線によるモニタ画像はコントラス
トが強くなって黒が強調された異和感のある画像とな
り、例えば、顔の場合には髭が強調された実像とはイメ
ージが大幅に異なった画像となってしまうという問題が
あった。図中、斜線矢印は赤外線、白抜き矢印は可視光
を示している。すなわち、赤外線透過フィルタ６とし
て、第８図（ａ）に示すような透過特性を有するスモー
クアクリルフィルタ、第８図（ｂ）に示すような透過特
性を有するシャープカットフィルタなどが用いられてい
るが、この赤外線透過フィルタ６によって固体撮像素子
１に入射する可視光も大幅にカットされるので、昼間の
太陽光あるいは玄関灯、街燈による夜間照明の照明光の
可視光の反射が大部分カットされてしまい、周囲が明る
い場合にあっても固体撮像素子１にて撮影されたモニタ
画像はコントラストが強調された赤外線画像になり、画
質低下が著しいという問題があった。[Background Art] Conventionally, an intercom subunit with a monitor camera of this type is
It is composed of a monitor camera that uses a solid-state image sensor such as a CCD image sensor and a MOS image sensor, and an intercom circuit.The monitor image captured by the monitor camera is displayed on the monitor TV to confirm the visitor. ing. Further, in order to deal with the visitors at night, as shown in FIG. 7, a light emitting diode 2 for auxiliary illumination is provided on the side of the image pickup lens 7 of the monitor camera 3, and the light emitted from the light emitting diode 2 is provided to the visitor. There has been one having a so-called night-vision function in which the reflected light is irradiated and detected by the solid-state imaging device 1. By the way, in such a conventional example, an infrared transmission filter 6 having a small visible light transmittance and a large infrared transmittance is attached to a monitor window in order to prevent a visitor from recognizing that the auxiliary illumination light is emitted. Although visible light was cut off, in general, a monitor image by near infrared rays has an unnatural image in which contrast is increased and black is emphasized.For example, in the case of a face, a real image in which a beard is emphasized is There was a problem that the image would be greatly different. In the figure, the shaded arrows indicate infrared rays and the white arrows indicate visible light. That is, as the infrared transmission filter 6, a smoke acrylic filter having a transmission characteristic as shown in FIG. 8 (a), a sharp cut filter having a transmission characteristic as shown in FIG. 8 (b), etc. are used. Since the visible light incident on the solid-state image sensor 1 is also largely cut by the infrared transmission filter 6, the reflection of visible light of daytime sunlight or the illumination light of night illumination by a street light and a street lamp is largely cut. Even if the surroundings are bright, the monitor image taken by the solid-state imaging device 1 becomes an infrared image with enhanced contrast, and there is a problem that the image quality is significantly deteriorated.
［発明の目的］ 本発明は上記の点に鑑みて為されたものであり、その
目的とするところは、発光ダイオードによる補助照明光
を目立たなくすることができ、しかも、周囲が明るい場
合におけるモニタ画像の画質低下を防止することができ
るドアホン子器を提供することにある。[Object of the Invention] The present invention has been made in view of the above points, and it is an object of the present invention to make auxiliary illumination light by a light emitting diode inconspicuous and to monitor in a bright environment. An object is to provide an intercom subunit that can prevent deterioration of image quality.
［発明の開示］ （実施例１） 第１図乃至第３図は本発明一実施例を示すもので、近
赤外光乃至可視光に感度を有するCCD撮像素子、MOS撮像
素子などの固体撮像素子１を用い補助照明用の発光ダイ
オード２を具備したモニタカメラ３と、ドアホン回路４
とで構成され、固体撮像素子１および発光ダイオード２
に対応して設けられるモニタ窓５に赤外線透過フィルタ
６を取着して成るドアホン子器において、赤外線透過フ
ィルタ６の固体撮像素子１に対応する部分（実施例では
撮像レンズ７に対応する部分）に可視光透過部6aを形成
したものである。なお、第３図中斜線を施した部分は赤
外線のみを透過させる部分（可視光カット）を示してい
る。ここに、固体撮像素子１を用いたモニタカメラ３お
よびドアホン回路４はハウジング８内に設けられ、モニ
タカメラ３に対応したモニタ窓５はハウジング８の前面
に覆着される前面プレート９に設けられている。またド
アホン回路４を構成するスピーカ11、マイク12および呼
出スイッチ13などは、ハウジング８の下部に設けられる
ようになっており、ハウジング８の側面に突設された取
付片14を取付枠あるいは埋め込みボックスに螺着して取
着され、前面プレート９は取付ねじによって取付枠ある
いは埋め込みボックスに取着されるようになっている。
第４図および第５図は、赤外線透過フィルタ６の具体的
構成を示すもので、第４図のものにあっては、赤外線を
透過し可視光をカットする光吸収フィルム31を透明合成
樹脂板あるいはガラス板のような基材30の周辺部に貼着
して赤外線透過フィルタ６を形成しており、光吸収フィ
ルム31が貼着されていない中央部分を可視光透過部6aと
している。また、第５図に示すものにあっては、淡色ス
モーク基材32の厚みを変えて可視光の透過量を変化さ
せ、赤外線透過フィルタ６を形成し、薄肉に形成してい
る中央部を可視光透過部6aとしている。DISCLOSURE OF THE INVENTION (Embodiment 1) FIGS. 1 to 3 show an embodiment of the present invention, which is a solid-state image pickup device such as a CCD image pickup device or a MOS image pickup device having sensitivity to near infrared light or visible light. A monitor camera 3 including a light emitting diode 2 for auxiliary illumination using the element 1, and a doorphone circuit 4
And a solid-state image sensor 1 and a light emitting diode 2
In the intercom sub-unit in which the infrared transmission filter 6 is attached to the monitor window 5 provided corresponding to, the portion corresponding to the solid-state image sensor 1 of the infrared transmission filter 6 (the portion corresponding to the imaging lens 7 in the embodiment). The visible light transmitting portion 6a is formed on the. The shaded portion in FIG. 3 indicates a portion (visible light cut) through which only infrared rays are transmitted. Here, the monitor camera 3 and the intercom circuit 4 using the solid-state image sensor 1 are provided in the housing 8, and the monitor window 5 corresponding to the monitor camera 3 is provided in the front plate 9 which is attached to the front surface of the housing 8. ing. Further, the speaker 11, the microphone 12, the call switch 13 and the like which compose the doorphone circuit 4 are provided in the lower portion of the housing 8, and a mounting piece 14 projecting from the side surface of the housing 8 is attached to a mounting frame or an embedded box. The front plate 9 is attached to a mounting frame or an embedded box by a mounting screw.
4 and 5 show a specific structure of the infrared transmitting filter 6, and in the case of FIG. 4, the light absorbing film 31 which transmits infrared rays and cuts visible light is provided with a transparent synthetic resin plate. Alternatively, the infrared transmitting filter 6 is formed by adhering it to the peripheral portion of the base material 30 such as a glass plate, and the central portion where the light absorbing film 31 is not adhered is the visible light transmitting portion 6a. Further, in the structure shown in FIG. 5, the thickness of the light-colored smoke base material 32 is changed to change the transmission amount of visible light, and the infrared transmission filter 6 is formed. The light transmitting portion 6a is used.
以下、実施例の動作について説明する。いま、本実施
例にあっては、赤外線透過フィルタ６の固定撮像素子１
に対応する部分に可視光透過部6aを設けており、発光ダ
イオード２に対応する部分は従来例と同様に可視光を透
過させないので、補助照明光を目立たなくすることがで
きるようになっている。一方、固体撮像素子１には、可
視光透過部6aを介して可視光および赤外光が入射するの
で、周囲が明るい場合におけるモニタ画像は、主に可視
光の反射による可視光画像となり、従来例のようにコン
トラストが強調された赤外線画像になることがなく、昼
間の太陽光あるいは夜間照明が十分な場合におけるモニ
タ画像の画質が良くなることになる。なお、固体撮像素
子１に入射する光量も従来例に比べて多くなるので、モ
ニタ画像の画質をより改善することができることにな
る。The operation of the embodiment will be described below. Now, in the present embodiment, the fixed image sensor 1 of the infrared transmission filter 6
The visible light transmitting portion 6a is provided in the portion corresponding to, and the portion corresponding to the light emitting diode 2 does not transmit visible light as in the conventional example, so that the auxiliary illumination light can be made inconspicuous. . On the other hand, since visible light and infrared light are incident on the solid-state imaging device 1 through the visible light transmitting portion 6a, the monitor image when the surroundings are bright is mainly a visible light image due to reflection of visible light. As in the example, an infrared image in which the contrast is emphasized does not occur, and the image quality of the monitor image is improved when the daytime sunlight or night illumination is sufficient. Since the amount of light incident on the solid-state image sensor 1 is larger than that of the conventional example, the image quality of the monitor image can be further improved.
（実施例２） 第６図は他の実施例を示すもので、呼出スイッチの押
圧を検出してモニタ動作を開始させる呼出回路20と、固
体撮像素子を駆動するクロックパルスを発生する同期発
生回路21と、モニタ映像を制御する映像制御回路22と、
周囲の明るさに応じて絞り機構（図示せず）を制御する
オートアイリス駆動回路23と、映像信号を増幅してモニ
タテレビにモニタ画像を表示させる映像出力回路24と、
補助照明用の発光ダイオード２を駆動する赤外照明回路
25とよりなるモニタ制御回路において、周囲の明るさに
応じて発光ダイオード２を点滅する自動点滅回路26を設
け、周囲の明るさが所定レベル以上になったときに発光
ダイオード２を消灯するようにしたものである。(Embodiment 2) FIG. 6 shows another embodiment. A calling circuit 20 for detecting the pressing of the calling switch and starting a monitor operation, and a synchronization generating circuit for generating a clock pulse for driving a solid-state image sensor. 21, an image control circuit 22 for controlling the monitor image,
An auto iris drive circuit 23 that controls a diaphragm mechanism (not shown) according to the ambient brightness, a video output circuit 24 that amplifies the video signal and displays a monitor image on a monitor TV,
Infrared lighting circuit for driving the light emitting diode 2 for auxiliary lighting
In the monitor control circuit consisting of 25, an automatic blinking circuit 26 for blinking the light emitting diode 2 according to the ambient brightness is provided, and the light emitting diode 2 is turned off when the ambient brightness becomes a predetermined level or more. It was done.
いま、本実施例においては、周囲の明るさが固体撮像
素子１にて撮影できる程度に明るい場合には、自動点滅
回路26によって発光ダイオード２が消灯され、不必要な
赤外線照明が行なわれないようにしているので、周囲の
光ずなわち可視光による照明だけによるモニタ画像が得
られることになり、赤外線照明によるコントラスト強調
を軽減して画質低下を防止することができ、実像に近い
自然なモニタ画像が得られることになる。Now, in the present embodiment, when the surrounding brightness is bright enough to be photographed by the solid-state image sensor 1, the light emitting diode 2 is turned off by the automatic blinking circuit 26 so that unnecessary infrared illumination is not performed. As a result, a monitor image can be obtained only by illumination with visible light, that is, with ambient light, and the contrast enhancement by infrared illumination can be reduced to prevent image quality deterioration, and a natural monitor close to a real image can be obtained. An image will be obtained.
［発明の効果］ 本発明は上述のように、近赤外光乃至可視光に感度を
有する固体撮像素子を用い赤外補助照明用の発光ダイオ
ードを具備したモニタカメラと、ドアホン回路とで構成
され、固体撮像素子および発光ダイオードに対応して設
けられるモニタ窓に赤外線透過フィルタを取着して成る
ドアホン子器において、赤外線透過フィルタの固体撮像
素子に対応する部分を可視光透過部にて構成したので、
補助照明光を目立たなくすることができ、しかも、周囲
が明るい場合におけるモニタ画像の画質低下を防止する
ことができるという効果がある。[Effects of the Invention] As described above, the present invention is composed of a monitor camera equipped with a light emitting diode for infrared auxiliary illumination using a solid-state imaging device having sensitivity to near-infrared light or visible light, and a doorphone circuit. , In the intercom subunit in which an infrared transmission filter is attached to a monitor window provided corresponding to the solid-state imaging device and the light-emitting diode, a portion corresponding to the solid-state imaging device of the infrared transmission filter is configured by a visible light transmission part. So
There is an effect that the auxiliary illumination light can be made inconspicuous, and the deterioration of the image quality of the monitor image can be prevented when the surroundings are bright.
【図面の簡単な説明】 第１図は本発明一実施例の正面図、第２図は同上の水平
断面図、第３図は同上の要部正面図、第４図および第５
図は同上の具体例の要部構成および動作を示す図、第６
図は他の実施例の回路図、第７図は従来例の問題点を示
す図、第８図は同上の動作説明図である。 １は固体撮像素子、２は発光ダイオード、３はモニタカ
メラ、４はドアホン回路、５はモニタ窓、６は赤外線透
過フィルタ、6aは可視光透過部である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a horizontal sectional view of the same as above, and FIG. 3 is a front view of essential parts of the same as above, FIGS.
FIG. 6 is a diagram showing a configuration and operation of a main part of the above specific example,
FIG. 7 is a circuit diagram of another embodiment, FIG. 7 is a diagram showing a problem of the conventional example, and FIG. 8 is an operation explanatory diagram of the same. 1 is a solid-state image sensor, 2 is a light emitting diode, 3 is a monitor camera, 4 is a doorphone circuit, 5 is a monitor window, 6 is an infrared transmission filter, and 6a is a visible light transmission part.
Claims (2)
像素子を用い補助照明用の発光ダイオードを具備したモ
ニタカメラと、ドアホン回路とで構成され、固体撮像素
子および発光ダイオードに対応して設けられるモニタ窓
に赤外線透過フィルタを取着して成るドアホン子器にお
いて、前記赤外線透過フィルタは、該赤外線透過フィル
タの固体撮像素子に対応する部分を可視光透過部にて構
成し、該赤外線透過フィルタの発光ダイオードに対応す
る部分を、赤外線を透過し可視光をカットするよう構成
して成ることを特徴とするドアホン子器。1. A monitor camera equipped with a light-emitting diode for auxiliary illumination using a solid-state image sensor having sensitivity to near-infrared light or visible light, and a doorphone circuit, which correspond to the solid-state image sensor and the light-emitting diode. In an intercom subunit in which an infrared transmission filter is attached to a monitor window provided for the infrared transmission filter, the infrared transmission filter has a portion corresponding to the solid-state image sensor of the infrared transmission filter formed of a visible light transmission portion. An intercom subunit, wherein a portion of the transmission filter corresponding to the light emitting diode is configured to transmit infrared rays and cut visible light.
滅する自動点滅回路を設け、周囲の明るさが所定レベル
以上になったときに発光ダイオードを消灯するようにし
たことを特徴とする特許請求の範囲第１項記載のドアホ
ン子器。2. A patent characterized in that an automatic blinking circuit for blinking a light emitting diode according to the ambient brightness is provided, and the light emitting diode is turned off when the ambient brightness exceeds a predetermined level. The intercom subunit according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016583A JP2552276B2 (en) | 1987-01-27 | 1987-01-27 | Door phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016583A JP2552276B2 (en) | 1987-01-27 | 1987-01-27 | Door phone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63185184A JPS63185184A (en) | 1988-07-30 |
| JP2552276B2 true JP2552276B2 (en) | 1996-11-06 |
Family
ID=11920299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62016583A Expired - Lifetime JP2552276B2 (en) | 1987-01-27 | 1987-01-27 | Door phone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2552276B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3826970B2 (en) * | 1997-02-17 | 2006-09-27 | シャープ株式会社 | Doorphone child unit with TV camera |
| JP3682573B2 (en) * | 1999-12-28 | 2005-08-10 | 松下電工株式会社 | Door intercom unit and intercom system with TV |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169760U (en) * | 1982-04-30 | 1983-11-12 | 松下電工株式会社 | Intercom with monitor and TV |
| JPS615689A (en) * | 1984-06-20 | 1986-01-11 | Mitsubishi Electric Corp | Visitor recognizing device |
-
1987
- 1987-01-27 JP JP62016583A patent/JP2552276B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63185184A (en) | 1988-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |