JP2958078B2 - Reflective illumination device with parabolic mirror - Google Patents
Reflective illumination device with parabolic mirrorInfo
- Publication number
- JP2958078B2 JP2958078B2 JP2233988A JP23398890A JP2958078B2 JP 2958078 B2 JP2958078 B2 JP 2958078B2 JP 2233988 A JP2233988 A JP 2233988A JP 23398890 A JP23398890 A JP 23398890A JP 2958078 B2 JP2958078 B2 JP 2958078B2
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- light
- auxiliary
- parabolic mirror
- light source
- 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 - Fee Related
Links
Landscapes
- Projection Apparatus (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】 「技術分野」 本発明は、放物面鏡を有する反射照明装置に関し、特
に照射エリアを非円形とする場合に好適な反射照明装置
に関する。Description: TECHNICAL FIELD The present invention relates to a reflection lighting device having a parabolic mirror, and more particularly to a reflection lighting device suitable for a non-circular irradiation area.
「従来技術およびその問題点」 放物面鏡は、その焦点上においた光源を出て反射する
光束が光軸と平行な光として出射するという性質があ
り、この性質を利用した各種の反射照明装置が実際に用
いられている。この反射照明装置の照明エリアは、放物
面鏡の性質上、円形であり、非円形の照明エリアを照明
する場合には、例えば放物面鏡の開放端部に、照明エリ
アの形状をした出射開口を有するマスクを装着すること
が行なわれていた。ところが、このように単純にマスク
の出射開口形状によって照明エリア形状を設定すると、
光量のロスが非常に大きい。すなわち光源を出て放物面
鏡で反射する光は、光軸と平行な方向に出射するのに対
し、マスクは、これを単純に遮ってしまうために、放物
面鏡から出られない光線が多くなり、光量の有効利用が
図れない。"Prior art and its problems" Parabolic mirrors have the property that the light flux reflected from the light source at the focal point is emitted as light parallel to the optical axis. The device is actually used. The illumination area of this reflective illumination device is circular in nature of the parabolic mirror, and when illuminating a non-circular illumination area, for example, the open end of the parabolic mirror has the shape of the illumination area. It has been practiced to mount a mask having an exit aperture. However, if the illumination area shape is simply set by the exit aperture shape of the mask as described above,
The loss of light amount is very large. In other words, the light that exits the light source and is reflected by the parabolic mirror exits in a direction parallel to the optical axis, whereas the mask simply blocks the light, so that the light cannot exit the parabolic mirror. And the amount of light cannot be effectively used.
非円形の照明エリアを要する照明装置としては、例え
ば、矩形の画面を有する透過型液晶プロジェクタがあ
る。この液晶プロジェクタでは、吸収、反射等により、
光の利用効率が10％以下であるのが実情であり、この照
明系において、さらに光源部分において以上のようなロ
スが存在すれば、光の利用効率はさらに低下してしま
う。As a lighting device requiring a non-circular lighting area, for example, there is a transmissive liquid crystal projector having a rectangular screen. In this liquid crystal projector, absorption, reflection, etc.
The reality is that the light use efficiency is 10% or less, and in this illumination system, if the above-mentioned loss is present in the light source portion, the light use efficiency is further reduced.
「発明の目的」 本発明は、放物面鏡を用いた反射照明装置において、
光の利用効率を高めることを目的とする。特に本発明
は、照明エリアが円形であると非円形であるとを問わ
ず、光源の光の有効利用が図れ、しかも小型の照明装置
を得ることを目的とする。"Object of the Invention" The present invention relates to a reflective illumination device using a parabolic mirror,
The purpose is to increase the light use efficiency. In particular, an object of the present invention is to obtain a small-sized lighting device that can effectively use light from a light source regardless of whether the lighting area is circular or non-circular.
「発明の概要」 本発明は、基本的には、焦点位置に光源を置く放物面
鏡を主鏡とし、この主鏡の開放端部に、光軸と直交する
内径が2fより大きい環状補助平面鏡と、この環状補助平
面鏡の中心部に接続した、主鏡と焦点を共通にする補助
放物面鏡とからなる補助反射手段を設け、この補助反射
手段の補助放物面鏡の中央部に、出射開口を穿設したこ
とを特徴としている。"Summary of the Invention" The present invention basically employs a parabolic mirror in which a light source is located at a focal position as a primary mirror, and an annular auxiliary having an inner diameter perpendicular to the optical axis larger than 2f is provided at an open end of the primary mirror. Auxiliary reflecting means comprising a plane mirror and an auxiliary parabolic mirror connected to the center of the annular auxiliary plane mirror and having the same focal point as the main mirror is provided, and the auxiliary reflecting means is provided at the center of the auxiliary parabolic mirror. , An emission opening is provided.
照明エリアの形状は、この出射開口形状によって決定
することができ、非円形とすることができる。The shape of the illumination area can be determined by this exit aperture shape and can be non-circular.
「発明の実施例」 以下矩形の照明エリアを得るための実施例について本
発明を説明する。"Examples of the Invention" The present invention will be described below with reference to examples for obtaining a rectangular illumination area.
放物面鏡からなる主鏡11は、その光軸Ｏ上の焦点Ｆに
光源12を置く。この主鏡11は、その開放端部Ｑより十分
奥に焦点Ｆが位置する、深い形状をしている。A main mirror 11 composed of a parabolic mirror has a light source 12 placed at a focal point F on an optical axis O thereof. The primary mirror 11 has a deep shape in which the focal point F is located sufficiently deeper than its open end Q.
この主鏡11の開放端部Ｑの外側には、補助反射手段と
しての環状補助平面鏡13と補助放物面鏡15が位置してい
る。この環状補助平面鏡13は、内径が主鏡11の焦点距離
ｆの２倍（2f）より大きく、その反射面13aを、光軸Ｏ
と直交させている。この環状補助平面鏡13の内側に位置
する補助放物面鏡15は、焦点Ｆを主鏡11と共通にするも
ので、この補助放物面鏡15の中心に、矩形の出射開口14
が形成されている。Outside the open end Q of the main mirror 11, an annular auxiliary plane mirror 13 and an auxiliary parabolic mirror 15 as auxiliary reflecting means are located. The annular auxiliary plane mirror 13 has an inner diameter larger than twice (2f) the focal length f of the main mirror 11, and its reflecting surface 13a is
And orthogonal. An auxiliary parabolic mirror 15 located inside the annular auxiliary plane mirror 13 has a common focal point F with the main mirror 11, and has a rectangular exit aperture 14 at the center of the auxiliary parabolic mirror 15.
Are formed.
上記構成の本反射照明装置について、光源12を出て環
状補助平面鏡13の平面視の大きさ（光軸Ｏからの距離2
f）内で主鏡11に入射する第一の光と、光源12を出て補
助放物面鏡15の正面視の大きさ内で主鏡11に入射する第
二の光と、光源12を出て補出射開口14の正面視の大きさ
内で主鏡11に入射する第三の光とを考える。With respect to the present reflection lighting device having the above-described configuration, the size of the annular auxiliary plane mirror 13 that exits the light source 12 in plan view (the distance from the optical axis
f) the first light that enters the primary mirror 11, the second light that exits the light source 12 and enters the primary mirror 11 within the size of the auxiliary parabolic mirror 15 when viewed from the front, and the light source 12 Consider the third light that exits and enters the primary mirror 11 within the size of the auxiliary emission opening 14 in front view.
第一の光は、反射面11aにより反射して、光軸Ｏと平
行な光となり、次に、補助平面鏡13の反射面13aによっ
て反射する。補助平面鏡13は、光軸Ｏと直交しているか
ら、反射面13aで反射した光は、入射光と同一の光路を
戻って主鏡11に達し、反射面11aで反射して焦点Ｆ（光
源12）に向かい、さらに主鏡11に達して反射面11aで反
射する。この反射光のうち、出射開口14の正面視の大き
さ内の反射光は、光軸Ｏと平行な光となって出射開口14
から外部に出射する。The first light is reflected by the reflecting surface 11a, becomes light parallel to the optical axis O, and then reflected by the reflecting surface 13a of the auxiliary plane mirror 13. Since the auxiliary plane mirror 13 is orthogonal to the optical axis O, the light reflected on the reflection surface 13a returns along the same optical path as the incident light and reaches the main mirror 11, and is reflected on the reflection surface 11a to form a focal point F (light source). It goes to 12), further reaches the primary mirror 11, and is reflected by the reflection surface 11a. Of the reflected light, the reflected light within the size of the exit aperture 14 in front view becomes light parallel to the optical axis O, and
Out of the device.
第二の光は、同じく反射面11aで反射して光軸と平行
な光となった後、補助放物面鏡15に向かう。補助放物面
鏡15に至った光は、反射面15aで反射した後、再び光源1
2に向かい、主鏡11の反射面11aで反射した後、光軸Ｏと
平行になって出射開口14から出射する。The second light is also reflected by the reflection surface 11a to become light parallel to the optical axis, and then travels to the auxiliary parabolic mirror 15. The light reaching the auxiliary parabolic mirror 15 is reflected by the reflecting surface 15a, and then again
After traveling toward 2, the light is reflected by the reflection surface 11a of the primary mirror 11, and then exits from the exit aperture 14 in parallel with the optical axis O.
第三の光は、同じく反射面11aで反射して光軸と平行
な光となった後、出射開口14に至り、そのまま外部に出
射する。The third light is also reflected by the reflection surface 11a to become light parallel to the optical axis, reaches the emission opening 14, and is emitted to the outside as it is.
以上の作用は、出射開口14の短辺側であると長辺側で
あるとを問わない。従って、光源12の光が無駄なく出射
開口14から出射することとなる。本発明は、直接的には
非円形の照明エリアを得るために開発されたものである
が、出射開口14が円形であっても、同様に光の有効利用
が図れる。The above operation does not matter whether the light exit opening 14 is on the short side or the long side. Therefore, the light from the light source 12 is emitted from the emission opening 14 without waste. Although the present invention has been developed to obtain a non-circular illumination area directly, even if the exit aperture 14 is circular, the light can be effectively used similarly.
なお以上は光源12として、理想的な点光源を想定した
議論であるが、実際の光源には大きさがある。従って、
補助放物面鏡15の出射開口14の大きさは、実際の光源の
大きさを考慮して、光源から出る光を実質的に遮ること
のないように設けるのが望ましい。The above discussion is based on the assumption of an ideal point light source as the light source 12, but the actual light source has a size. Therefore,
The size of the exit aperture 14 of the auxiliary parabolic mirror 15 is desirably provided so as not to substantially block light emitted from the light source in consideration of the size of the actual light source.
「発明の効果」 以上のように本発明の反射照明装置によれば、放物面
鏡を主鏡とし、その開放端部に、環境補助平面鏡と補助
放物面鏡からなる補助反射手段を設け、この補助放物面
鏡の中央部に出射開口を穿設するという簡単な構成によ
り、小型で、しかも光の利用効率が高い装置を得ること
ができる。また、照明エリアの形状を、出射開口の形状
のみによって設定できるという利点がある。[Effects of the Invention] As described above, according to the reflection lighting device of the present invention, the parabolic mirror is used as the main mirror, and the open end thereof is provided with the auxiliary reflecting means including the environmental auxiliary plane mirror and the auxiliary parabolic mirror. With a simple configuration in which an emission opening is formed at the center of the auxiliary parabolic mirror, a device that is small and has high light use efficiency can be obtained. Further, there is an advantage that the shape of the illumination area can be set only by the shape of the exit aperture.
第1A、1B、1C図は本発明の反射照明装置の第一の実施例
を示すもので、第1A図は正面図、第1B、1C図はそれぞれ
第1A図のＢ−Ｂ線、Ｃ−Ｃ線に沿う断面図である。 11……主鏡（放物面鏡）、Ｆ……焦点、Ｏ……光軸、12
……光源、13……環状補助平面鏡、14……出射開口、15
……補助放物面鏡、11a、13a、15a……反射面。FIGS. 1A, 1B and 1C show a first embodiment of the reflection lighting device of the present invention. FIG. 1A is a front view, and FIGS. 1B and 1C are respectively the BB line and C-C of FIG. 1A. It is sectional drawing which follows the C line. 11: Primary mirror (parabolic mirror), F: Focus, O: Optical axis, 12
…… Light source, 13… Circular auxiliary plane mirror, 14 …… Emission aperture, 15
… Auxiliary parabolic mirror, 11a, 13a, 15a …… Reflection surface.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G02B 5/10 G03B 21/00 G03B 21/20 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G02B 5/10 G03B 21/00 G03B 21/20
Claims (2)
し、 この主鏡の開放端部に、上記主鏡の焦点距離をｆとした
とき、光軸と直交する内径が2fより大きい環状補助平面
鏡と、この環状補助平面鏡の中心部に接続した、上記主
鏡と焦点を共通にする補助放物面鏡とからなる補助反射
手段を設け、 この補助反射手段の補助放物面鏡の中央部に、出射開口
を穿設したことを特徴とする放物面鏡を有する反射照明
装置。A parabolic mirror for placing a light source at a focal position is a primary mirror, and an open end of the primary mirror has an inner diameter perpendicular to the optical axis when the focal length of the primary mirror is f. Auxiliary reflecting means comprising a large annular auxiliary plane mirror and an auxiliary parabolic mirror connected to the center of the annular auxiliary plane mirror and having the same focal point as the main mirror is provided. A reflective illumination device having a parabolic mirror, wherein an emission opening is formed in a central portion of the illumination device.
射開口は、非円形をなしている反射照明装置。2. The reflection illuminating device according to claim 1, wherein the exit aperture has a non-circular shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233988A JP2958078B2 (en) | 1990-09-04 | 1990-09-04 | Reflective illumination device with parabolic mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2233988A JP2958078B2 (en) | 1990-09-04 | 1990-09-04 | Reflective illumination device with parabolic mirror |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04114103A JPH04114103A (en) | 1992-04-15 |
| JP2958078B2 true JP2958078B2 (en) | 1999-10-06 |
Family
ID=16963787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2233988A Expired - Fee Related JP2958078B2 (en) | 1990-09-04 | 1990-09-04 | Reflective illumination device with parabolic mirror |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2958078B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006184676A (en) * | 2004-12-28 | 2006-07-13 | Seiko Epson Corp | Projector |
-
1990
- 1990-09-04 JP JP2233988A patent/JP2958078B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04114103A (en) | 1992-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2655465B2 (en) | Reflection type homogenizer and reflection type illumination optical device | |
| JP2902464B2 (en) | Reflective lighting device | |
| KR960015689A (en) | Light source unit with double reflector to eliminate shadows from the lamp | |
| JP3067491B2 (en) | Projection exposure equipment | |
| US3143921A (en) | Photographic enlarger system | |
| JP2958078B2 (en) | Reflective illumination device with parabolic mirror | |
| JP2991464B2 (en) | Reflective illumination device with parabolic mirror | |
| JPH0774086A (en) | Projection exposure device | |
| JP3021390B2 (en) | Lighting device for projector | |
| JP2002189192A (en) | Illuminator and liquid crystal projector | |
| JP3188764B2 (en) | Illumination optical system | |
| TW368614B (en) | Back side projection type display device | |
| JPS62299943A (en) | Transmission type liquid crystal display device | |
| JPH0815639A (en) | Projection type display device using deformed mirror type spacial light modulator element | |
| JPH03257444A (en) | Illuminating system for microreader/printer | |
| JPH03210548A (en) | Projector | |
| JPS6219723B2 (en) | ||
| GB1275620A (en) | Optical system | |
| JPH07301800A (en) | Light source device for liquid crystal projector | |
| KR0118688Y1 (en) | Projector lighting system | |
| JPH064753U (en) | LCD projector lighting device | |
| JPH0453926A (en) | Illuminator | |
| JPS587665A (en) | Optical device for copying machine | |
| JPH0535364Y2 (en) | ||
| KR940001356B1 (en) | Device for improving light efficiency in a liquid crystal projection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |