JPS634648B2 - - Google Patents
Info
- Publication number
- JPS634648B2 JPS634648B2 JP56136634A JP13663481A JPS634648B2 JP S634648 B2 JPS634648 B2 JP S634648B2 JP 56136634 A JP56136634 A JP 56136634A JP 13663481 A JP13663481 A JP 13663481A JP S634648 B2 JPS634648 B2 JP S634648B2
- Authority
- JP
- Japan
- Prior art keywords
- diffusion
- photometric
- photometry
- light
- optical path
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000009792 diffusion process Methods 0.000 description 25
- 238000005375 photometry Methods 0.000 description 17
- 230000035945 sensitivity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012780 transparent material Substances 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
- 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
- G01J1/0448—Adjustable, e.g. focussing
-
- 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
- G01J1/0474—Diffusers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Exposure Control For Cameras (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】
本発明は、測光分布感度を任意に可変し得るカ
メラの測光装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photometric device for a camera that can arbitrarily vary the photometric distribution sensitivity.
従来から撮影レンズ透過光のフイルム面又はシ
ヤツタ幕面反射光を用いて測光する所謂TTLダ
イレクト測光装置として、第１図に示すように測
光光路中に拡散板を出し入れすることにより、平
均測光と部分測光を行なう方法がある。平均測光
を行なう場合には、撮影レンズ２から入射しフイ
ルム面３で反射され、測光レンズ４、受光素子５
に至る間の測光光路中に拡散板１を挿入し、この
拡散板１により光束を拡散して受光素子５により
測光を行なうことになる。又、部分測光の場合は
拡散板１を測光光路外へ退避させ測光を行なう。
この拡散板１の退避は測光光路外に退出させるの
で、そのための空間的なスペースが必要となり、
カメラボデイにそのための余裕がない場合は、こ
の方法が使用できないという欠点がある。 Conventionally, the so-called TTL direct metering device measures light using the light reflected from the film surface or the shutter curtain surface of the light transmitted through the photographing lens.As shown in Fig. 1, by inserting and removing a diffuser plate into the light metering optical path, average light metering and partial metering can be performed. There is a method of photometry. When performing average photometry, the light enters through the photographing lens 2, is reflected by the film surface 3, and then passes through the photometry lens 4 and the light receiving element 5.
A diffuser plate 1 is inserted into the photometric optical path between the two, and the light beam is diffused by the diffuser plate 1, and photometry is performed by the light receiving element 5. In the case of partial photometry, the diffuser plate 1 is retracted out of the photometry optical path and photometry is performed.
Since the diffusing plate 1 is moved out of the photometric optical path, a spatial space is required for this purpose.
The disadvantage is that this method cannot be used if the camera body does not have enough room for this.
本発明の目的は、上述の従来装置の欠点を除去
し、調整することにより空間的スペースをさほど
必要とせず、しかも測光感度分布を連続的に変化
させることのできるカメラの測光装置を提供する
ことにあり、その要旨は、互いに対向する面に相
互にほぼ密着し得る突起及び凹部が設けられた複
数枚の拡散板を測光光路中に介挿し、これら拡散
板同志を光路に沿つて接離させることを特徴とす
るとするものである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a photometering device for a camera that eliminates the drawbacks of the conventional device described above, does not require much space through adjustment, and can continuously change the photometric sensitivity distribution. The gist of this method is to insert a plurality of diffuser plates, each of which has protrusions and recesses that can come into close contact with each other on opposing surfaces, into a photometric optical path, and to move these diffusers toward and away from each other along the optical path. It is characterized by:
本発明を第２図以下に図示の実施例に基づき詳
細に説明する。 The present invention will be explained in detail based on the embodiments shown in FIG. 2 and below.
第２図は拡散部材１０の断面図であり、２枚の
透明材料の拡散板１１ａ，１１ｂから成り、これ
らの対向面は多数の半球状の突起又は凹部を有す
る拡散面１２ａ，１２ｂとされ、これらの突起と
凹部とは互に嵌合し拡散板１１ａ，１１ｂ同志は
密着すると恰も１枚の透明板となるようになつて
いる。そしてこの拡散部材１０は、第３図に示す
ようにフイルム面３と測光レンズ４の間の測光光
路中に介挿され、光路に沿つて拡散板１１ａ，１
１ｂの間隔は図示しない駆動機構により可変し得
るようになつている。 FIG. 2 is a cross-sectional view of the diffusion member 10, which consists of two diffusion plates 11a and 11b made of a transparent material, the opposing surfaces of which are diffusion surfaces 12a and 12b having a large number of hemispherical protrusions or recesses, These protrusions and recesses fit into each other, and when the diffusion plates 11a and 11b are brought into close contact with each other, they become one transparent plate. The diffusing member 10 is inserted into the photometric optical path between the film surface 3 and the photometric lens 4 as shown in FIG.
The distance between 1b can be changed by a drive mechanism (not shown).
従つて第３図に示すように、拡散板１１ａと１
１ｂとをほぼ密着させれば、拡散部材１０は拡散
作用を持たず、測光レンズ４によつて決まる画角
の範囲の光のみが受光素子５に入るようになり、
フイルム面３の一部の範囲をにらむ画角を有する
測光レンズ４を用いれば、受光素子５に於いてフ
イルム面３の部分測光をなし得ることになる。 Therefore, as shown in FIG.
1b, the diffusing member 10 will not have a diffusing effect, and only light within the field angle determined by the photometric lens 4 will enter the light receiving element 5.
By using the photometric lens 4 having an angle of view that covers a partial range of the film surface 3, partial photometry of the film surface 3 can be performed in the light receiving element 5.
又、第４図に示すように拡散部材１０の拡散板
１１ａ，１１ｂとを開離すれば、各拡散面１２
ａ，１２ｂでは拡散作用がなされ、測光レンズ
４、受光素子５には拡散部材１０がないときに決
まる測光レンズの画角よりも、フイルム面３の広
い範囲の反射光が入射し、広い範囲での測光が可
能となり、拡散作用を適当に持たせることにより
平均測光ができる。 Furthermore, if the diffusion plates 11a and 11b of the diffusion member 10 are separated as shown in FIG.
a, 12b performs a diffusion effect, and the reflected light from a wider range of the film surface 3 is incident on the photometric lens 4 and the light receiving element 5 than the angle of view of the photometric lens determined when there is no diffuser 10, and the light is reflected over a wider range. It is possible to perform photometry, and by providing an appropriate diffusion effect, average photometry can be performed.
拡散板１１ａ，１１ｂの間隔に応じて拡散作用
の程度は変化するので、間隙を調整することによ
り測光分布感度を連続的に変更することができ
る。 Since the degree of diffusion effect changes depending on the distance between the diffusion plates 11a and 11b, the photometric distribution sensitivity can be continuously changed by adjusting the distance.
第５図は拡散部材１０の他の実施例を示し、拡
散板１１ａの拡散面１２ａは多数個の三角錐の突
起が設けてあり、拡散板１１ｂの拡散面１２ｂに
はこの突起に対応する凹部が設けられている。
尚、拡散面１２ａ，１２ｂはその他の形状を任意
に採り得るところであり、例えば波形面なども考
えられる。 FIG. 5 shows another embodiment of the diffusion member 10, in which the diffusion surface 12a of the diffusion plate 11a is provided with a large number of triangular pyramidal protrusions, and the diffusion surface 12b of the diffusion plate 11b has recesses corresponding to the protrusions. is provided.
It should be noted that the diffusion surfaces 12a and 12b may have any other shape, for example, a waveform surface may be considered.
実施例に於いては拡散部材１０を２枚の拡散板
１１ａ，１１ｂにより構成したが、３枚以上の拡
散板を用いてもよい。又、拡散板の屈折率を大き
くすることにより、僅かな移動量で測光分布感度
を大きく変化させることができる。更には拡散板
１１ａ又は１１ｂを移動させることにより、測光
分布感度の変化に対する露光量の偏差を調整する
こともできる。即ち、平均測光時に於いてはフイ
ルム面３又はシヤツタ幕面の大部分からの撮影光
を測光することになり、受光素子１への入射光量
が大きくなりがちである。この場合には更に拡散
板１１ａ，１１ｂ同志の間隙を広げて拡散作用を
大とすることにより、受光素子１への入射光量を
逆に減少させることが可能であり、均一な同一被
写体について部分測光時の出力と同一にすること
ができる。 In the embodiment, the diffusion member 10 is composed of two diffusion plates 11a and 11b, but three or more diffusion plates may be used. Furthermore, by increasing the refractive index of the diffuser plate, the photometric distribution sensitivity can be greatly changed with a small amount of movement. Furthermore, by moving the diffuser plate 11a or 11b, it is also possible to adjust the deviation of the exposure amount with respect to the change in the photometric distribution sensitivity. That is, during average metering, the photographing light from most of the film surface 3 or shutter curtain surface is measured, and the amount of light incident on the light receiving element 1 tends to be large. In this case, by further widening the gap between the diffusion plates 11a and 11b to increase the diffusion effect, it is possible to conversely reduce the amount of light incident on the light receiving element 1, and it is possible to perform partial photometry for the same uniform subject. It can be made the same as the output at the time.
以上説明したように本発明に係るカメラの測光
装置は、拡散面を有する複数枚の拡散板の間隔を
光路に沿つて変化させることにより、測光分布感
度を変更するものであるから、従来の同種装置と
比較して空間的スペースをさほど必要としない利
点がある。しかもこの測光分布感度は連続的に変
化させることができる効果も有している。 As explained above, the camera photometry device according to the present invention changes the photometry distribution sensitivity by changing the spacing between a plurality of diffuser plates each having a diffusion surface along the optical path. It has the advantage that it does not require much space compared to other devices. Moreover, this photometric distribution sensitivity also has the effect of being able to be changed continuously.
第１図は従来の測光装置の構成図、第２図以下
は本発明に係るカメラの測光装置の実施例を示
し、第２図は拡散部材の断面図、第３図は部分測
光時の光路図、第４図は平均測光時の光路図、第
５図は他の実施例の拡散部材の断面図である。
符号２は撮影レンズ、３はフイルム面、４は測
光レンズ、５は受光素子、１０は拡散部材、１１
ａ，１１ｂは拡散板、１２ａ，１２ｂは拡散面で
ある。
Fig. 1 is a configuration diagram of a conventional photometry device, Fig. 2 and the following shows an embodiment of the photometry device for a camera according to the present invention, Fig. 2 is a cross-sectional view of a diffusing member, and Fig. 3 is an optical path during partial photometry. 4 are optical path diagrams during average photometry, and FIG. 5 is a sectional view of a diffusing member of another embodiment. 2 is a photographing lens, 3 is a film surface, 4 is a photometric lens, 5 is a light receiving element, 10 is a diffusion member, 11
a and 11b are diffusion plates, and 12a and 12b are diffusion surfaces.
Claims (1)
起及び凹部が設けられた複数枚の拡散板を測光光
路中に介挿し、これら拡散板同志を光路に沿つて
接離させることを特徴とするカメラの測光装置。1. A camera characterized in that a plurality of diffuser plates each having protrusions and recesses that can come into close contact with each other on opposing surfaces are inserted into a photometric optical path, and these diffusers are moved toward and away from each other along the optical path. photometric device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56136634A JPS5838821A (en) | 1981-08-31 | 1981-08-31 | Light measuring device for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56136634A JPS5838821A (en) | 1981-08-31 | 1981-08-31 | Light measuring device for camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5838821A JPS5838821A (en) | 1983-03-07 |
| JPS634648B2 true JPS634648B2 (en) | 1988-01-29 |
Family
ID=15179889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56136634A Granted JPS5838821A (en) | 1981-08-31 | 1981-08-31 | Light measuring device for camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838821A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161874A (en) * | 1974-11-26 | 1976-05-28 | Sharp Kk | KOMITSUDOHI KARISOKU TEISOCHI |
| JPS5590825A (en) * | 1978-12-29 | 1980-07-09 | Chino Works Ltd | Reflection reference plate |
-
1981
- 1981-08-31 JP JP56136634A patent/JPS5838821A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161874A (en) * | 1974-11-26 | 1976-05-28 | Sharp Kk | KOMITSUDOHI KARISOKU TEISOCHI |
| JPS5590825A (en) * | 1978-12-29 | 1980-07-09 | Chino Works Ltd | Reflection reference plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5838821A (en) | 1983-03-07 |
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