JPH0521054Y2 - - Google Patents
Info
- Publication number
- JPH0521054Y2 JPH0521054Y2 JP2945986U JP2945986U JPH0521054Y2 JP H0521054 Y2 JPH0521054 Y2 JP H0521054Y2 JP 2945986 U JP2945986 U JP 2945986U JP 2945986 U JP2945986 U JP 2945986U JP H0521054 Y2 JPH0521054 Y2 JP H0521054Y2
- Authority
- JP
- Japan
- Prior art keywords
- prism
- light
- incident
- lens
- exit
- 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
- 230000003287 optical effect Effects 0.000 claims description 30
- 238000010521 absorption reaction Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 230000031700 light absorption Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005342 prism glass Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、例えば光像をタンデム空間におい
て2方向に光量を分割して伝達する光量分割装置
や分配器の光学系として用いられる光学装置に関
するものである。[Detailed description of the invention] [Industrial application field] This invention relates to an optical device used, for example, as an optical system of a light splitter or distributor that divides and transmits a light image in two directions in a tandem space. It is something.
この種の従来の光学系は、第3図に示すような
構成になつている。すなわち、伝達すべき光像K
のI1の位置から出た光は、入射側レンズL1で
無限大にフオーカスされて平行光に変換された後
に、プリズムPに入射し、断面が直角二等辺三角
形の角柱形状を有するプリズムP内の90%反射面
P1で90%の光量分だけa矢印方向へ反射され、
さらに、一方の出射側レンズL2により集束さ
れ、一方の伝達部D1のI2の位置に結像されて
光像Kが90%の光量で伝達される。
This type of conventional optical system has a configuration as shown in FIG. That is, the optical image K to be transmitted
The light emitted from the position I1 of 90% of the light is reflected in the direction of arrow a by the 90% reflective surface P1,
Further, the light is focused by one exit lens L2, and is imaged at a position I2 of one transmission portion D1, so that the light image K is transmitted with 90% of the light intensity.
一方、90%反射面P1を透過した10%の光量の
光は、プリズムP上面の全反射面P2で全反射さ
れた後に、90%反射面P1で反対側のb矢印方向
に10%の90%、すなわち9%の光量分だけ反射さ
れ、さらに、他方の出射側レンズL3により集束
され、他方の伝達部D2のI3の位置に結像され
て光像Kが9%の光量で伝達される。このように
して、I1の位置の光像Kが両伝達部D1,D2
のそれぞれのI2およびI3の各位置に90%およ
び9%の光量の光像に分割されて伝達される。 On the other hand, 10% of the light transmitted through the 90% reflective surface P1 is totally reflected by the total reflective surface P2 on the upper surface of the prism P, and then the 10% 90 %, that is, 9% of the light intensity, is further focused by the other exit side lens L3, and is imaged at the position I3 of the other transmission section D2, so that the light image K is transmitted with 9% of the light intensity. . In this way, the optical image K at the position I1 is transmitted to both transmission parts D1 and D2.
The light is divided into light images of 90% and 9% light intensity and transmitted to the respective positions I2 and I3.
ところで、前述の方式とした光学系は、第4図
に示すように、光像Kの外周位置I4から出た光
のうち、プリズムPの入射面f1の他方側から入
射した光線l1は、90%反射面P1で反射されて
プリズムPの一方の出射面f2から出射される。
一方、プリズムPの入射面f1における一方側か
ら入射した光線l2,l3は、一方の出射面f2
により全反射された後に90%反射面P1で反射さ
れて一方の出射面f2から出射される。この2種
の光線l1およびl2,l3は、a矢印方向の軸
に対して互いに対称な方向に向かうため、これを
一方の出射側レンズL2を通すと、一方の光線l
1が一方の伝達部D1のF1の位置に結像するの
に対し、他方の光線l2,l3は、レンズL2の
光軸に対してF1の位置とは対称なF2の位置に
結像し、F2の位置に結像する光像はゴースト像
(二重像)となり、鮮明な光線を伝達することが
できない。他方の出射面f3から出射する光線に
おいても同様のゴースト像ができる。
By the way, in the optical system using the above-mentioned method, as shown in FIG. % reflected by the reflective surface P1 and emitted from one exit surface f2 of the prism P.
On the other hand, the light rays l2 and l3 incident from one side of the entrance surface f1 of the prism P are transmitted to one exit surface f2.
After being totally reflected by the 90% reflecting surface P1, the light is emitted from one exit surface f2. These two types of light rays l1, l2, and l3 head in directions symmetrical to each other with respect to the axis in the direction of the arrow a, so when they pass through one exit lens L2, one light ray l
1 is imaged at the F1 position of one transmission part D1, whereas the other light rays l2 and l3 are imaged at the F2 position, which is symmetrical to the F1 position with respect to the optical axis of the lens L2, The optical image formed at the F2 position becomes a ghost image (double image) and cannot transmit clear light rays. A similar ghost image is also formed in the light rays emitted from the other exit surface f3.
この考案は、このような問題点に鑑みてなされ
たもので、プリズムを用いて光像を伝達する光学
系を備えたものにおいて、レンズの光軸に対して
対称なゴースト像の発生を解消した光学装置を提
供しようとしてなされたものである。 This idea was created in view of these problems, and it eliminates the occurrence of ghost images that are symmetrical with respect to the optical axis of the lens in optical systems that use prisms to transmit light images. This was done in an attempt to provide an optical device.
この考案の光学装置は、上記課題を達成するた
めに、断面が直角二等辺三角形の角柱形状を有
し、互いに直交する一対の面をそれぞれ入射面お
よび出射面とし斜面を反射面としたプリズムに、
伝達すべき光像から出た光をレンズを通して前記
入射面から入射させ、前記反射面で反射して前記
出射面から出射した反射光をレンズで結像するよ
うにした光学装置において、前記光像の最外縁部
から出た光が前記入射側のレンズを介して前記プ
リズムに入射した時のプリズム内での入射角をθ
とし、光量的に必要とする前記プリズムの一辺の
長さをAとした場合に、前記入射面および出射面
を、それぞれ少なくともAtanθ/2の厚み分だけ突
出させるとともにその各突出部分の側面をそれぞ
れ光吸収面とした構成を要旨とするものである。
In order to achieve the above-mentioned problems, the optical device of this invention has a prism shape with a right isosceles triangle cross section, and a pair of mutually perpendicular surfaces are an incident surface and an exit surface, respectively, and an inclined surface is a reflective surface. ,
An optical device in which light emitted from an optical image to be transmitted is made incident from the incident surface through a lens, reflected by the reflecting surface, and reflected light emitted from the exit surface is imaged by the lens. When the light emitted from the outermost edge of the prism enters the prism through the lens on the entrance side, the angle of incidence within the prism is θ.
If the length of one side of the prism required in terms of light quantity is A, then the incident surface and the exit surface are each protruded by at least a thickness of Atanθ/2, and the side surfaces of each protruding portion are respectively The gist is a configuration with a light absorption surface.
上記構成としたこの考案の光学装置は、プリズ
ムの入射面および出射面がそれぞれ所要の厚み分
だけ張り出す状態で突出されているので、光像の
最外縁部から出てプリズムにθの入射角で入射す
る光が出射面で全反射するが、所定の厚み分だけ
張り出した突出部分の側面に形成された光吸収面
に吸収されて消滅し、出射面から出射することが
ないので、ゴースト像を発生することがない。
In the optical device of this invention with the above structure, the entrance and exit surfaces of the prism are protruded by the required thickness, so that the light exits from the outermost edge of the prism and hits the prism at an incident angle of θ. The incident light is totally reflected at the output surface, but it is absorbed by the light absorption surface formed on the side surface of the protruding part that extends by a predetermined thickness and disappears, and does not exit from the output surface, so a ghost image is created. will not occur.
以下、この考案の好ましい1実施例を図面に基
づいて詳細に説明する。
Hereinafter, a preferred embodiment of this invention will be described in detail based on the drawings.
第1図はこの考案に用いるプリズム1を示し、
このプリズム1を除く他の光学系は第3図および
第4図と同様である。このプリズム1は、伝達す
べき光像の最外縁部から出て入射側レンズL1を
介してプリズム1に入射する光線l3のプリズム
1内での入射角をθとし、プリズム1の光量的に
必要とする一辺の長さをAとした場合に、入射面
2、一方の出射面3、全反射面4および他方の出
射面5が、それぞれ破線で示す通常のプリズム面
に対し少なくともAtanθ/2の厚み分だけ張り出す
状態に突出されていて、この各突出部分2′〜
5′のそれぞれの側面が光吸収面7となつている。
また、90%反射面6が形成されているのは、上記
した従来の装置と同様であり、光像の伝達作用は
上述の第3図の場合と全く同様であるので説明を
省略する。そして、プリズム1に対しθの入射角
で入射した光像の最外縁部からの光線l3は、
Atanθ/2の厚み分だけ突出した一方の出射面3で
全反射した後に光吸収面7に吸収されて消滅し、
出射面3から出射することがない。従つて、この
光線l3よりも内周側の光線であつて一方の出射
面3で全反射される全ての光線l2は、必ず光吸
収面7で吸収されることになる。同様に、他方の
出射面5で全反射する光線も全て光吸収面7で吸
収されるから、両伝達方向ともにゴースト像は発
生しない。 Figure 1 shows a prism 1 used in this invention,
The optical system other than this prism 1 is the same as that shown in FIGS. 3 and 4. This prism 1 is designed so that the incident angle within the prism 1 of a light ray l3 that exits from the outermost edge of the optical image to be transmitted and enters the prism 1 via the incident side lens L1 is θ, and the amount of light of the prism 1 is required. When the length of one side of It protrudes by the thickness, and each of these protruding parts 2'~
Each side surface of 5' serves as a light absorption surface 7.
Further, the formation of the 90% reflective surface 6 is the same as in the conventional device described above, and the optical image transmission function is exactly the same as in the case of FIG. 3 described above, so a description thereof will be omitted. The light ray l3 from the outermost edge of the optical image incident on the prism 1 at an incident angle of θ is
After being totally reflected on one exit surface 3 that protrudes by the thickness of Atanθ/2, it is absorbed by the light absorption surface 7 and disappears.
No radiation is emitted from the emission surface 3. Therefore, all of the light rays 12 which are on the inner circumferential side of the light ray 13 and are totally reflected by one exit surface 3 are necessarily absorbed by the light absorption surface 7. Similarly, since all of the light rays that are totally reflected by the other exit surface 5 are absorbed by the light absorption surface 7, no ghost images are generated in both transmission directions.
次に、前記プリズム1の作製について説明する
と、上述のような変形のプリズム1は一般に作製
が困難である。そこで、第2図に示すように、2
個の三角プリズム1a,1bの各対応面に、
Atanθ/2の厚みを有し側面が光吸収面7となつた
ガラス板8を、光学的にプリズムガラスと同一性
質の接着剤を用いて貼り合わせる手段を用いるこ
とにより、容易に作製できる。 Next, the production of the prism 1 will be explained. Prisms 1 having the above-mentioned deformation are generally difficult to produce. Therefore, as shown in Figure 2, 2
On each corresponding surface of the triangular prisms 1a and 1b,
It can be easily produced by using a means of optically bonding glass plates 8 having a thickness of Atan θ/2 and having light absorption surfaces 7 on their side surfaces using an adhesive having the same properties as prism glass.
また、通常のプリズムの光の入射面および出射
面には無反射コーテイングが施されているが、ガ
ラス板8を三角プリズム1a,1bに貼り合わせ
て、この三角プリズム1a,1bの各90%反射面
となる面6a,6bを相互に貼り合わせた後に無
反射コーテイングを施す場合には、2面同時に無
反射コーテイングすることになつて非常に困難で
あり、そのため、2回のコーテイング作業が必要
となり時間的にムダであり、また、コーテイング
の強度を強くするには加熱してコーテイングを行
なうのが一般的であるが、ガラスの塊であるプリ
ズムを一様に加熱、冷却するのは時間的な無駄が
多過ぎる。そこで、ガラス板8を三角プリズム1
a,1bに貼り合わせる前に、ガラス板8の入射
面2または出射面3,5となる面に予め無反射コ
ーテイングを施しておき、更にガラス板8の全反
射面4となる面に予め100%反射面をコーテイン
グしておき、その後に、これらのガラス板8を三
角プリズム1a,1bの相当する面に貼り合わせ
るようにすれば、極めて容易に第1図に示した構
造のプリズム1を得られるだけでなく、必要な光
量を減少させることのない高性能なプリズム1と
なる利点がある。尚、ガラス板8を三角プリズム
1a,1bに貼り合わせる手段により作製するの
で、既存のプリズムにガラス板を貼り合わせるだ
けで達成できる。 In addition, anti-reflection coating is applied to the light entrance and exit surfaces of ordinary prisms, but by bonding the glass plate 8 to the triangular prisms 1a and 1b, 90% of each of the triangular prisms 1a and 1b is reflected. When applying anti-reflection coating after bonding the surfaces 6a and 6b together, it is very difficult to apply anti-reflection coating to two surfaces at the same time, so two coating operations are required. It is a waste of time, and it is common to apply coating by heating to increase the strength of the coating, but uniformly heating and cooling a prism, which is a lump of glass, is time-consuming. There's too much waste. Therefore, we put the glass plate 8 into the triangular prism 1.
Before bonding to the surfaces a and 1b, anti-reflection coating is applied in advance to the incident surface 2 or the exit surface 3, 5 of the glass plate 8, and a 100% anti-reflection coating is applied to the surface of the glass plate 8 which will become the total reflection surface 4. By coating the % reflective surfaces and then bonding these glass plates 8 to the corresponding surfaces of the triangular prisms 1a and 1b, the prism 1 having the structure shown in FIG. 1 can be obtained very easily. In addition, there is an advantage that the prism 1 has high performance without reducing the amount of light required. Incidentally, since the glass plate 8 is manufactured by bonding the triangular prisms 1a and 1b, it can be achieved by simply bonding the glass plate to an existing prism.
尚、この考案は、上記実施例に限定されるもの
ではなく、請求の範囲に基づいて種々の実施態様
が考えられるのは勿論であり、例えば、実施例で
は、2個の三角プリズム1a,1bを貼り合せた
分配器用プリズム1を例示したが、単一のプリズ
ムを用いて光を直角方向に伝達する光学系にも適
用できるのは言うまでもない。 Note that this invention is not limited to the above-mentioned embodiment, and of course, various embodiments can be considered based on the scope of the claims. For example, in the embodiment, two triangular prisms 1a and 1b are used. Although the distributor prism 1 is shown as an example, it goes without saying that the present invention can also be applied to an optical system in which a single prism is used to transmit light in a perpendicular direction.
以上詳述したように、この考案の光学装置によ
ると、プリズムの入射面および出射面を所要の厚
み分だけ突出させるとともに、この突出部分の側
面を光吸収面とする構成としたので、出射側レン
ズの光軸に対して対称に現れていたゴースト像を
完全に防止することができ、良好な光像伝達を行
なうことができる。
As described in detail above, according to the optical device of this invention, the entrance and exit surfaces of the prism are made to protrude by the required thickness, and the side surfaces of these protruding portions are used as light absorption surfaces, so that the exit side Ghost images appearing symmetrically with respect to the optical axis of the lens can be completely prevented, and good optical image transmission can be achieved.
第1図はこの考案の光学装置の1実施例の要部
の光学図、第2図は第1図のプリズムの分解図、
第3図は従来装置の光学図、第4図は第3図の装
置のゴーストの発生を示す光学図である。
1……プリズム、L1……レンズ、2……入射
面、3,5……出射面、2′〜5′……突出部分、
6……反射面、7……光吸収面、8……ガラス
板。
FIG. 1 is an optical diagram of the main parts of an embodiment of the optical device of this invention, FIG. 2 is an exploded view of the prism shown in FIG. 1,
FIG. 3 is an optical diagram of a conventional device, and FIG. 4 is an optical diagram showing the occurrence of ghosts in the device of FIG. 1... Prism, L1... Lens, 2... Incident surface, 3, 5... Output surface, 2' to 5'... Protruding portion,
6... Reflective surface, 7... Light absorbing surface, 8... Glass plate.
Claims (1)
いに直交する一対の面をそれぞれ入射面および出
射面とし斜面を反射面としたプリズムに、伝達す
べき光像から出た光をレンズを通して前記入射面
から入射させ、前記反射面で反射して前記出射面
から出射した反射光をレンズで結像するようにし
た光学装置において、前記光像の最外縁部から出
た光が前記入射側のレンズを介して前記プリズム
に入射した時のプリズム内での入射角をθとし、
光量的に必要とする前記プリズムの一辺の長さを
Aとした場合に、前記入射面および出射面を、そ
れぞれ少なくともAtanθ/2の厚み分だけ突出させ るとともに、その各突出部分の側面をそれぞれ光
吸収面としたことを特徴とする光学装置。[Scope of Claim for Utility Model Registration] A prism having a prism shape with a right isosceles triangular cross section, a pair of mutually orthogonal surfaces as an entrance surface and an exit surface, and an inclined surface as a reflection surface, from an optical image to be transmitted. In an optical device, the emitted light enters the incident surface through a lens, is reflected by the reflective surface, and is emitted from the exit surface and forms an image with the lens. When the light enters the prism through the lens on the incident side, the incident angle within the prism is θ,
When the length of one side of the prism required in terms of light quantity is A, the incident surface and the exit surface are each protruded by at least a thickness of Atanθ/2, and the side surfaces of each protruding portion are respectively exposed to light. An optical device characterized by having an absorption surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2945986U JPH0521054Y2 (en) | 1986-02-28 | 1986-02-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2945986U JPH0521054Y2 (en) | 1986-02-28 | 1986-02-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62142021U JPS62142021U (en) | 1987-09-08 |
JPH0521054Y2 true JPH0521054Y2 (en) | 1993-05-31 |
Family
ID=30833358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2945986U Expired - Lifetime JPH0521054Y2 (en) | 1986-02-28 | 1986-02-28 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0521054Y2 (en) |
-
1986
- 1986-02-28 JP JP2945986U patent/JPH0521054Y2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS62142021U (en) | 1987-09-08 |
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