JPS60235028A - Narrow wavelength band light emitting and receiving apparatus - Google Patents
Narrow wavelength band light emitting and receiving apparatusInfo
- Publication number
- JPS60235028A JPS60235028A JP9162784A JP9162784A JPS60235028A JP S60235028 A JPS60235028 A JP S60235028A JP 9162784 A JP9162784 A JP 9162784A JP 9162784 A JP9162784 A JP 9162784A JP S60235028 A JPS60235028 A JP S60235028A
- Authority
- JP
- Japan
- Prior art keywords
- light
- filter
- wavelength band
- receiving
- interference filter
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000295 emission spectrum Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004397 blinking Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
- G01J5/602—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature using selective, monochromatic or bandpass filtering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0418—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using attenuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
- G01J1/24—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors
- G01J1/26—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors adapted for automatic variation of the measured or reference value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の利用分野）
本発明は、比較的狭帯域の発光波長特性を有する投光光
源より光を発し、その光を受光器にて受光して何らかの
処理を行う狭波長帯域投受光装置の改良に関するもので
ある。Detailed Description of the Invention (Field of Application of the Invention) The present invention is directed to a narrow-band light emitting device that emits light from a projecting light source having emission wavelength characteristics in a relatively narrow band, receives the light with a receiver, and processes the light. This invention relates to improvement of a wavelength band light emitting/receiving device.
（発明の背影）
従来、この種の装置の光源として１例えば発光ダイオー
ド、半導体レーザ等の比較的狭帯域の発光スペクトル分
布を有するものを用い、投受光システムを構成する場合
、受光器の前段に光源の発光スペクトル分布の帯域を含
む比較的狭帯域の光学帯域透過フィルタ（例えば干渉フ
ィルタ）を配置し、光源からの光と外光との弁別を行っ
ていた。しかしながら１発光ダイオードや半導体レーザ
等の狭帯域の発光スペクトル分布を有する光源は、温度
による発光ピーク波長の変動比率が大きく、実際には光
学帯域透過フィルタの波長帯域幅をあまり狭くできなか
った。そのため、光源からの光と外光との弁別度として
は必らずしも満足できるものではなかった。(Background of the invention) Conventionally, when a light emitting/receiving system is constructed using a light source such as a light emitting diode or a semiconductor laser having a relatively narrow band emission spectrum distribution as a light source for this type of device, a light source is used at the front stage of the light receiver. A relatively narrow band optical band transmission filter (for example, an interference filter) that includes the band of the emission spectrum distribution of the light source is disposed to discriminate between light from the light source and external light. However, in light sources such as light emitting diodes and semiconductor lasers having a narrow band emission spectrum distribution, the fluctuation ratio of the emission peak wavelength due to temperature is large, and in practice it has not been possible to narrow the wavelength bandwidth of the optical band pass filter very much. Therefore, the degree of discrimination between the light from the light source and external light is not necessarily satisfactory.
（発明の目的）
本発明の目的は、上述した問題点を解決し、受光器へ入
射する投光光源からの光と外光との弁別度を向上させる
ことができる狭波長帯域投受光装置を提供することであ
る。(Object of the Invention) An object of the present invention is to provide a narrow wavelength band light emitting/receiving device capable of solving the above-mentioned problems and improving the degree of discrimination between the light from the projecting light source that enters the light receiver and external light. It is to provide.
（発明の特徴）
上記目的を達成するために１本発明は、受光手段での受
光量が最大値になるように、干渉フィルタ手段を光軸に
対して傾斜させる角度制御手段を設け、以て、干渉フィ
ルタ手段の透過波長帯域を前記投光手段の発光波長に一
致させるようにしたことを特徴とする。(Features of the Invention) In order to achieve the above object, the present invention provides an angle control means for tilting the interference filter means with respect to the optical axis so that the amount of light received by the light receiving means reaches a maximum value. , the transmission wavelength band of the interference filter means is made to match the emission wavelength of the light projecting means.
（発明の実施例）
以下１本発明を図示の実施例に基づいて詳細に説明する
。(Embodiments of the Invention) The present invention will be described below in detail based on illustrated embodiments.
第１図は本発明を自動ドア、警報装置等の障害物検出に
用いられる光電スイッチに適用した場合の一実施例を示
す概略構成図である。１は投光光源、２は投光レンズ、
３は受光レンズ。FIG. 1 is a schematic configuration diagram showing an embodiment in which the present invention is applied to a photoelectric switch used for detecting obstacles such as automatic doors and alarm devices. 1 is a floodlight source, 2 is a floodlight lens,
3 is the light receiving lens.
４は色ガラスフィルタ、５は干渉フィルタ、６は干渉フ
ィルタ５を透過する光を受光し、光電変換する受光器、
７は投光光源１を駆動する駆動回路、８は、受光器６の
出力信号Ｓ。が最大になるようにフィルタ回転駆動源９
を介して干渉フィルタ５を光軸Ｃに対して傾斜させる回
転角制御回路、１０は制御信号発生回路、Ｚは干渉フィ
ルタ５０回転角θを制御するための回転角制御信号、Ｔ
はトリガ信号である。4 is a colored glass filter; 5 is an interference filter; 6 is a light receiver that receives light transmitted through the interference filter 5 and converts it into electricity;
7 is a drive circuit for driving the projecting light source 1; 8 is an output signal S from the light receiver 6; The filter rotation drive source 9
10 is a control signal generation circuit, Z is a rotation angle control signal for controlling the rotation angle θ of the interference filter 50, T
is the trigger signal.
第２図ｆａ）はある温度ｔの時の投光光源１０発光スペ
クトル分布を表しており、投光光源１０発光ピーク波長
λ、は該投光光源１の温度変化に応じて矢印方向に変動
する。Figure 2 fa) shows the emission spectrum distribution of the floodlight source 10 at a certain temperature t, and the emission peak wavelength λ of the floodlight source 10 changes in the direction of the arrow in accordance with the temperature change of the floodlight source 1. .
第２図ｆｂ）は色ガラスフィルタ４の透過特性を表して
おり、札は色ガラスフィルタ４の遮断透過波長である。FIG. 2 fb) shows the transmission characteristics of the colored glass filter 4, and the label indicates the cutoff transmission wavelength of the colored glass filter 4.
第２図（Ｃ１は干渉フィルタ５が光軸Ｃに対して垂直位
置からある角度θだけ傾けられた時の。FIG. 2 (C1 is when the interference filter 5 is tilted by a certain angle θ from the perpendicular position with respect to the optical axis C.
干渉フィルタ５の透過特性を表しており、該干渉フィル
タ５は光軸Ｃに対して垂直位置から角度θ（任意）傾け
られると、その透過帯域はより短い波長（尚、λθは角
度θの時の透過ピーク波長）の方に移動（既に公知）す
る。It represents the transmission characteristic of the interference filter 5, and when the interference filter 5 is tilted at an angle θ (arbitrary) from the perpendicular position to the optical axis C, its transmission band changes to a shorter wavelength (where λθ is the angle θ). transmission peak wavelength) (already known).
次に動作について説明する。投光光源１かも投光レンズ
２を介して光軸Ｃに沿って投光された光は、受光レンズ
３によって色ガラスフィルタ４．干渉フィルタ５を介し
て受光器６に投影される。この時、受光器６に入射する
光束は。Next, the operation will be explained. The light emitted along the optical axis C through the projecting light source 1 and the projecting lens 2 is passed through the light receiving lens 3 to a colored glass filter 4 . It is projected onto a light receiver 6 via an interference filter 5. At this time, the luminous flux incident on the light receiver 6 is:
第２図ｆｂ）の特性を持つ色ガラスフィルタ４と第２図
（Ｃ１の特性を持つ干渉フィルタ５によってフィルタリ
ングされ、比較的狭い波長帯域の光のみが透過する。し
たがって、Ｓ／Ｎ比の良い信号光が受光器６にて検出さ
れる。即ち、信号光具−外の光を外光と呼ぶとすると、
透過帯域が信号光のスペクトルにマツチした狭帯域透過
特性の色ガラスフィルタ４と干渉フィルタ５によってフ
ィルタを構成しているので、外光の影響を大幅に減らす
ことができ、信号光をＳ／Ｎ比良く検出することができ
る。It is filtered by the colored glass filter 4 having the characteristics shown in Fig. 2 (fb) and the interference filter 5 having the characteristics shown in Fig. 2 (C1), and only light in a relatively narrow wavelength band is transmitted.Therefore, the S/N ratio is good. The signal light is detected by the light receiver 6. That is, if the light outside the signal light device is called external light,
The filter is composed of a colored glass filter 4 with a narrow band transmission characteristic whose transmission band matches the spectrum of the signal light, and an interference filter 5, so the influence of external light can be significantly reduced and the signal light can be It can be detected relatively well.
以上の様な投受光システムにおいて、障害物がない時に
は、信号光は受光器６によって受光（検出）されるが、
光軸Ｃ上に障害物がある時には、信号光は受光器６では
検出されず、これによって障害物があることが検知され
る。In the above light emitting/receiving system, when there are no obstacles, the signal light is received (detected) by the light receiver 6.
When there is an obstacle on the optical axis C, the signal light is not detected by the light receiver 6, thereby detecting the presence of the obstacle.
ところで、投光光源１０発光波長帯域が温度によって変
化すれば、この発光波長帯域と色ガラスフィルタ４と干
渉フィルタ５によって構成される透過波長帯域とにずれ
を生じ、信号光の透過エネルギが減少する。これを補償
するために１回転角制御回路８は制御信号発生回路１０
からのトリガ信号Ｔを元に回転角制御信号Ｚをフィルタ
回転駆動源９へ出力する。これにより。By the way, if the emission wavelength band of the floodlight source 10 changes depending on the temperature, a deviation occurs between this emission wavelength band and the transmission wavelength band formed by the colored glass filter 4 and the interference filter 5, and the transmitted energy of the signal light decreases. . To compensate for this, the one-rotation angle control circuit 8 uses a control signal generation circuit 10.
A rotation angle control signal Z is output to the filter rotation drive source 9 based on the trigger signal T from the filter rotation drive source 9. Due to this.
フィルタ回転駆動源９は干渉フィルタ５を光軸Ｃに対し
て垂直位置からある角度θだけ傾斜させ、該干渉フィル
タ５の透過波長帯域を変え。The filter rotation drive source 9 tilts the interference filter 5 by a certain angle θ from a position perpendicular to the optical axis C, thereby changing the transmission wavelength band of the interference filter 5.
受光器６の出力信号Ｓ。が最大（この時、発光波長帯域
と透過波長帯域がほぼ一致する）になるようにする。尚
、このような動作は連続的に行わせる必要はなく１時々
行わせれば良い。Output signal S of photoreceiver 6. (at this time, the emission wavelength band and the transmission wavelength band almost match). Incidentally, such an operation does not need to be performed continuously, but may be performed once in a while.
第３図は本発明をカメラの測距系に適用した場合の実施
例である。１１は光源点滅制御回路。FIG. 3 shows an embodiment in which the present invention is applied to a distance measuring system of a camera. 11 is a light source blinking control circuit.
１２は投光光源、１３はビームスプリッタ、１４は反射
ミラー％１５は反射ミラー１５ａを含む投受光光学系、
１６は前述の色ガラスフィルタ４と干渉フィルタ５とを
貼り合わせた光学帯域透過フィルタ、１７は参照光受光
素子１７ａと被写体Ｏかもの反射光を受光する受光素子
１７ｂとを有する受光器、１８．１９は増幅器。12 is a projecting light source, 13 is a beam splitter, 14 is a reflecting mirror, 15 is a projecting/receiving optical system including a reflecting mirror 15a,
Reference numeral 16 denotes an optical band transmission filter made by pasting together the colored glass filter 4 and the interference filter 5; 17 a light receiver having a reference light receiving element 17a and a light receiving element 17b for receiving reflected light from the subject O; 18. 19 is an amplifier.
２０は増幅器１８からの信号が最大になる様にフィルタ
駆動手段２１を介して光学帯域透過フィルタ１６を傾斜
させる回転角制御回路、２２は反射ミラー１５ａの角度
ψを検知する角度センサ、Ｚは前述と同様回転角制御信
号である。20 is a rotation angle control circuit that tilts the optical band transmission filter 16 via a filter drive means 21 so that the signal from the amplifier 18 is maximized; 22 is an angle sensor that detects the angle ψ of the reflection mirror 15a; and Z is the same as described above. This is the same rotation angle control signal.
、投光光源１２より発光された光はビームスプリッタ１
３によって二分割され、そのうちの一方の光（以後参照
光と呼ぶ）は反射ミラー１４゜光学帯域透過フィルタ１
６を介して参照光受光素子１７ａへ導かれる。他方の光
はビームスプリブタ１３を透過し、投受光光学系１５に
よって被写体Ｏに投光される。この光は被写体Ｏ上で反
射し１反射ミラー１５ａ（投受光光学系１５）、光学帯
域透過フィルタ１６を介して受光素子１７ｂに導かれる
。被写体Ｏ上に形成される投光スポットを受光素子１７
ｂ上に投影するための反射ミラー１５ａの角度ψ、は、
被写体０と投受光光学系１５の距離に依存しており、そ
の時の反射ミラー１５ａの角度ψにより被写体化すれば
、測距性能が向上する。透過波長帯域の最適化は、参照
光受光素子１７ａの出力を増幅器１８を介して回転角制
御回路２０に伝えることによって行われる。即ち１回転
角制御回路１６を１反射ミラー１５ａを介して受光素子
１７ｂに入射する主光束に対して、ある角度θだけ傾斜
させる。ここで、参照光受光素子１７ａにしなければな
らない。, the light emitted from the projecting light source 12 is transmitted to the beam splitter 1
3, and one of the lights (hereinafter referred to as reference light) is passed through a reflection mirror 14 and an optical band pass filter 1.
6 to the reference light receiving element 17a. The other light passes through the beam splitter 13 and is projected onto the object O by the light emitting/receiving optical system 15. This light is reflected on the object O and guided to the light receiving element 17b via the first reflecting mirror 15a (light projecting/receiving optical system 15) and the optical band pass filter 16. The light receiving element 17 detects the projected light spot formed on the object O.
The angle ψ of the reflecting mirror 15a for projecting onto b is,
It depends on the distance between the subject 0 and the light emitting/receiving optical system 15, and if the angle ψ of the reflecting mirror 15a at that time is used as the subject, the distance measurement performance will be improved. Optimization of the transmission wavelength band is performed by transmitting the output of the reference light receiving element 17a to the rotation angle control circuit 20 via the amplifier 18. That is, the one-rotation angle control circuit 16 is tilted by a certain angle θ with respect to the principal light flux that enters the light-receiving element 17b via the one-reflection mirror 15a. Here, the reference light receiving element 17a must be used.
第１．３図実施例によれば、投光光源１．１２によって
発光された信号光を受光器６．１７によって受光し、そ
の出力が最大となる様に受光器６，１７の前段に配置さ
れる干渉フィルタ５、光学帯域透過フィルタ１６を光軸
に対して傾斜させ、温度変化による発光波長帯域の変動
にその透過波長帯域を追従させるようにしたから、干渉
フィルタ５．光学帯域透過フィルタ１６０波長帯域幅を
狭くすることができ、受光器６．１７での光の弁別度を
向上させることが可能となる。According to the embodiment shown in FIG. 1.3, the signal light emitted by the projecting light source 1.12 is received by the light receiver 6.17, and the light receiver 6.17 is arranged in front of the light receivers 6, 17 so that its output is maximized. Since the interference filter 5 and the optical band transmission filter 16 are tilted with respect to the optical axis so that the transmission wavelength band follows the fluctuation of the emission wavelength band due to temperature change, the interference filter 5. The wavelength bandwidth of the optical band pass filter 160 can be narrowed, and the degree of discrimination of light at the light receiver 6.17 can be improved.
（発明と実施例との対応）
、本実施例において、投光光源１．１２が本発明の投光
手段に、受′ｙｔ、器６．１７が受光手段に。(Correspondence between the invention and the embodiments) In this embodiment, the projecting light source 1.12 is the projecting means of the present invention, and the receiver 6.17 is the light receiving means.
ＩＤ
干渉フィルタ５．光学帯域通過フィルタ、が干渉フィル
タ手段に、回転角制御回路８．フィルタ当する。ID interference filter5. An optical bandpass filter serves as an interference filter means, and a rotation angle control circuit 8. Apply filter.
（発明の効果）
以上説明したように５本発明によれば、受光手段での受
光量が最大値になるように、干渉フィルタ手段を光軸に
対して傾斜させる角度制御手段を設け、以て、干渉フィ
ルタ手段の透過波長帯域を前記投光手段の発光波長に一
致させるらの光と外光との弁別度を向上させることがで
きる。(Effects of the Invention) As explained above, according to the present invention, the angle control means for tilting the interference filter means with respect to the optical axis is provided so that the amount of light received by the light receiving means reaches the maximum value. By matching the transmission wavelength band of the interference filter means with the emission wavelength of the light projecting means, it is possible to improve the degree of discrimination between light and external light.
第１図は本発明を障害物検出に用いられる光電スイッチ
に適用した場合の一実施例を示す概略構成図、第２図ｆ
ａｔ ｔｂ） ｔｅｌは投光光源、色ガラスフィルタ及
び干渉フィルタの光学的特性を示す図、第３図は本発明
をカメラの測距系に適用した場合の一実施例を示すブロ
ック図である。
１・・・投光光源、４・・・色ガラスフィルタ、５・・
・干渉フィルタ、６・・・受光器、８・・・回転角制御
回路、９・・・フィルタ回転駆動源、１２・・・投光光
源、１６・・・光学帯域透過フィルタ、１７ａ・・・参
照光受光素子、１７ｂ・・・受光素子、２０・・・回転
角制御回路、２１・−・フィルタ駆動手段、λ・・・波
長。
Ｔ・・・トリガ信号、Ｚ・・・回転角制御信号、Ｃ・・
・光軸。
特許出願人 キャノン株式会社
代理人 中 村 稔Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention applied to a photoelectric switch used for detecting obstacles, and Fig. 2 f
at tb) tel is a diagram showing optical characteristics of a projection light source, a colored glass filter, and an interference filter, and FIG. 3 is a block diagram showing an embodiment in which the present invention is applied to a distance measuring system of a camera. 1... Projection light source, 4... Colored glass filter, 5...
- Interference filter, 6... Light receiver, 8... Rotation angle control circuit, 9... Filter rotation drive source, 12... Projection light source, 16... Optical band transmission filter, 17a... Reference light light receiving element, 17b... Light receiving element, 20... Rotation angle control circuit, 21... Filter driving means, λ... Wavelength. T...Trigger signal, Z...Rotation angle control signal, C...
·optical axis. Patent applicant Minoru Nakamura, Canon Co., Ltd. agent
Claims (1)
長特性を持つ投光手段と、該投光手段によって発光され
た光を受光する受光手段と。 該受光手段の前段に配置され、受光手段への一透過波長
帯域を弁別する干渉フィルタ手段とを備えた狭波長帯域
投受光装置において、前記受光手段での受光量が最大値
になるように。 前記干渉フィルタ手段を光軸に対して傾斜させる角度制
御手段を設けたことを特徴とする狭波長帯域投受光装置
。[Scope of Claims] 1. A light projecting means having a narrow band emission wavelength characteristic whose light emission wavelength varies depending on temperature, and a light receiving means for receiving the light emitted by the light projecting means. In a narrow wavelength band light projecting/receiving device, which includes interference filter means disposed upstream of the light receiving means and discriminating one transmission wavelength band to the light receiving means, such that the amount of light received by the light receiving means is a maximum value. A narrow wavelength band light emitting/receiving device, characterized in that it includes angle control means for tilting the interference filter means with respect to the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162784A JPS60235028A (en) | 1984-05-08 | 1984-05-08 | Narrow wavelength band light emitting and receiving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162784A JPS60235028A (en) | 1984-05-08 | 1984-05-08 | Narrow wavelength band light emitting and receiving apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60235028A true JPS60235028A (en) | 1985-11-21 |
Family
ID=14031787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9162784A Pending JPS60235028A (en) | 1984-05-08 | 1984-05-08 | Narrow wavelength band light emitting and receiving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60235028A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6360041B1 (en) | 1999-03-30 | 2002-03-19 | Nippon Sheet Glass Co., Ltd. | Optical demultiplexer and method of assembling optical demultiplexer in optical axis alignment |
| JP2019113376A (en) * | 2017-12-22 | 2019-07-11 | パイオニア株式会社 | Optical device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5975134A (en) * | 1982-10-22 | 1984-04-27 | Nippon Telegr & Teleph Corp <Ntt> | Light source for measuring light loss of optical fiber |
-
1984
- 1984-05-08 JP JP9162784A patent/JPS60235028A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5975134A (en) * | 1982-10-22 | 1984-04-27 | Nippon Telegr & Teleph Corp <Ntt> | Light source for measuring light loss of optical fiber |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6360041B1 (en) | 1999-03-30 | 2002-03-19 | Nippon Sheet Glass Co., Ltd. | Optical demultiplexer and method of assembling optical demultiplexer in optical axis alignment |
| JP2019113376A (en) * | 2017-12-22 | 2019-07-11 | パイオニア株式会社 | Optical device |
| JP2022093723A (en) * | 2017-12-22 | 2022-06-23 | パイオニア株式会社 | Optical device |
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