JPH0224270Y2 - - Google Patents
Info
- Publication number
- JPH0224270Y2 JPH0224270Y2 JP1982194132U JP19413282U JPH0224270Y2 JP H0224270 Y2 JPH0224270 Y2 JP H0224270Y2 JP 1982194132 U JP1982194132 U JP 1982194132U JP 19413282 U JP19413282 U JP 19413282U JP H0224270 Y2 JPH0224270 Y2 JP H0224270Y2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- photoreflector
- aperture
- camera
- control
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000011514 reflex Effects 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Optical Transform (AREA)
- Exposure Control For Cameras (AREA)
- Focusing (AREA)
- Feedback Control In General (AREA)
- Control Of Position Or Direction (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【考案の詳細な説明】
本考案は、自動焦点カメラ及び自動露出制御カ
メラにおける制御のための位置を検出するパルス
発生装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse generator for detecting a position for control in an autofocus camera and an autoexposure control camera.
従来の自動焦点カメラ及び自動露出制御カメラ
において制御のための位置検出手段として、発光
素子と受光素子を用いて直接自動焦点合わせ及び
露出制御系の駆動歯車より位置信号を検出する方
法があつたが、自動焦点合わせ及び露出制御系の
駆動歯車の歯数は歯数比や寸法的制限のため選択
できる歯数が限定されており、そのために検出で
きる信号の周波数も限定され、精度の点において
限界があつた。 In conventional autofocus cameras and autoexposure control cameras, there has been a method of detecting a position signal directly from the drive gear of the autofocus and exposure control system using a light emitting element and a light receiving element as a position detection means for control. The number of teeth that can be selected for the drive gear of the automatic focusing and exposure control system is limited due to the tooth ratio and dimensional limitations, which also limits the frequency of the signal that can be detected, and there is a limit in terms of accuracy. It was hot.
本考案は、簡単な手段により上述の従来例の欠
点を除去したカメラの制御用パルス発生装置を得
ることを目的とする。 SUMMARY OF THE INVENTION The object of the present invention is to provide a pulse generator for controlling a camera which eliminates the drawbacks of the above-mentioned conventional example by simple means.
以下、本考案の実施例を図面にもとづいて説明
する。 Hereinafter, embodiments of the present invention will be described based on the drawings.
第１図は一眼レフカメラの自動焦点検出装置の
一実施例の構成図で、Ｌはマスターレンズ、Ｍは
中央部がハーフミラーで構成されたクイツクリタ
ーンミラー、M′はマスターレンズＬを通過しク
イツクリターンミラーＭのハーフミラー部を透過
した光束をイメージセンサＳ上に導くための光路
変更用のサブミラーである。１は公知の自動焦点
制御部で、イメージセンサＳとモータ２が接続し
ている。該モータ２は駆動用歯車列３を介してマ
スターレンズＬを駆動するようになし、駆動用歯
車列３のうちの歯車３ａの歯面に相対して配置し
たフオトリフレクタ４が前記自動焦点制御部に接
続されている。 Figure 1 is a configuration diagram of one embodiment of an automatic focus detection device for a single-lens reflex camera, where L is a master lens, M is a quick return mirror whose central part is a half mirror, and M' is a passage through the master lens L. This is a sub-mirror for changing the optical path for guiding the light beam transmitted through the half mirror portion of the quick return mirror M onto the image sensor S. Reference numeral 1 denotes a known automatic focus control section, to which an image sensor S and a motor 2 are connected. The motor 2 is configured to drive the master lens L via a drive gear train 3, and a photoreflector 4 disposed opposite to the tooth surface of a gear 3a of the drive gear train 3 controls the automatic focus control section. It is connected to the.
そして、モータ２により駆動用歯車列３を介し
てマスターレンズＬを駆動し、そのデフオーカス
量は、歯車３ａの歯数をフオトリフレクタ４によ
つて信号化することによる検出し、焦点合わせを
行なうのである。 Then, the master lens L is driven by the motor 2 via the driving gear train 3, and the amount of defocus is detected by converting the number of teeth of the gear 3a into a signal by the photoreflector 4, and focusing is performed. be.
第２図は自動露出制御カメラにおける絞り量検
出装置の一実施例の構成図である。 FIG. 2 is a block diagram of an embodiment of an aperture amount detection device in an automatic exposure control camera.
絞り羽根５の保持環６に対して回動可能に絞り
駆動用歯車７が設けられ、該歯車７は図示しない
モータ等により伝動歯車列８を介して駆動されて
いる。該伝動歯車列８のうち歯車８ａの歯面に相
対してフオトリフレクタ９及びストツパーレバー
１２が配置され、該フオトリフレクタ９は公知の
露出制御回路１０に接続され、該ストツプレバー
１２は軸１２ａで図示しないカメラ本体の構造部
材に回動可能に支持されている。また、該ストツ
プレバー１２はばね１３により反時計方向に付勢
され、その一端の爪部１２ｂは通常前記歯車８ａ
の歯より離間しているが、その他端部１２ｃを露
出制御回路１０に接続する電磁石１１の作動で吸
着されると、ストツプレバー１２は時計方向に回
動し、その爪部１２ｂで歯車８ａに係止し伝導歯
車列８と連動する絞り羽根５を所要の絞り開口位
置で停止させるようになつている。 An aperture driving gear 7 is rotatably provided on the retaining ring 6 of the aperture blade 5, and the gear 7 is driven via a transmission gear train 8 by a motor (not shown) or the like. A photoreflector 9 and a stopper lever 12 are arranged opposite the tooth surface of the gear 8a of the transmission gear train 8, the photoreflector 9 is connected to a known exposure control circuit 10, and the stopper lever 12 is connected to a shaft 12a. It is rotatably supported by a structural member of the camera body (not shown). Further, the stop lever 12 is biased counterclockwise by a spring 13, and a claw portion 12b at one end of the stop lever 12 is normally attached to the gear 8a.
However, when the other end 12c is attracted by the operation of the electromagnet 11 that connects the exposure control circuit 10, the stop lever 12 rotates clockwise and engages the gear 8a with its pawl 12b. The aperture blades 5 interlocked with the stop transmission gear train 8 are stopped at a desired aperture opening position.
第３図ないし第５図は、上記カメラにおける制
御装置の位置検出手段である第１図の歯車３ａと
フオトリフレクタ４及び第２図の歯車８ａとフオ
トリフレクタ９の関連構成について、従来例と比
較してさらに説明するものであるが、第１図のも
のと第２図のものとは同一構成であるので、第図
のものについて説明する。 3 to 5 compare the related configurations of the gear 3a and photoreflector 4 in FIG. 1 and the gear 8a and photoreflector 9 in FIG. 2, which are the position detection means of the control device in the camera, with the conventional example. However, since the structure shown in FIG. 1 and the structure shown in FIG. 2 are the same, the structure shown in FIG. 2 will be explained below.
まず、第３図ａは従来例を示すもので、歯車２
０の歯部の側面に相対して、発光部２１ａ及び受
光部２１ｂとを同一面にもつフオトリフレクタ２
１を配置し、該歯車２０を検出すると、そのパル
ス信号と歯車２０の歯の関係は第５図ａに示すよ
うに１ピツチ毎に１つのパルス信号が出る。 First, Fig. 3a shows a conventional example, in which the gear 2
A photoreflector 2 having a light emitting part 21a and a light receiving part 21b on the same surface opposite to the side surface of the tooth part 0
1 is placed and the gear 20 is detected, the relationship between the pulse signal and the teeth of the gear 20 is such that one pulse signal is output for each pitch as shown in FIG. 5a.
一方、第３図ｂは本実施例によるもので、歯車
３ａの歯車の歯先面３ｂ及び歯底面３ｃに反射面
を設け、この反射面に相対して発光部４ａ及び受
光部４ｂとを同一面にもつフオトリフレクタ４を
配置し、該歯車３ａを検出すると、そのパルス信
号と歯車３ａの歯の関係は第５図ｂに示すように
１ピツチ毎に２つのパルス信号が出る。 On the other hand, FIG. 3b shows this embodiment, in which a reflective surface is provided on the top surface 3b and bottom surface 3c of the gear 3a, and the light emitting part 4a and the light receiving part 4b are aligned facing the reflective surface. When the photoreflector 4 is placed on the surface and the gear 3a is detected, the relationship between the pulse signal and the teeth of the gear 3a is such that two pulse signals are output for each pitch as shown in FIG. 5b.
ところが、通常のフオトリフレクタにおける特
性として、反射面とフオトリフレクタとの距離と
出力電流の関係は第４図に示す曲線となるので反
射面とフオトリフレクタとの距離を、例えば1
及び2に設定すると同レベルの出力が得られる
ことになる。したがつて、本実施例の場合には、
フオトリフレクタ４の受光部４ｂの受光面と歯車
３ａの歯先面３ｂ及び歯底面３ｃの各反射面との
距離をそれぞれ1及び2に設定するとフオトリ
フレクタ４の出力はいずれも同一レベルになしう
る。 However, as a characteristic of a normal photoreflector, the relationship between the distance between the reflective surface and the photoreflector and the output current is the curve shown in Figure 4, so the distance between the reflective surface and the photoreflector is set to 1
and 2 , the same level of output will be obtained. Therefore, in the case of this example,
If the distances between the light-receiving surface of the light-receiving section 4b of the photoreflector 4 and the reflective surfaces of the top surface 3b and tooth bottom surface 3c of the gear 3a are set to 1 and 2 , respectively, the outputs of the photoreflector 4 can be made to the same level. .
次に以上の構成の本実施例の動作を説明する。
まず、第１図の一眼レフカメラにおける合焦位置
検出装置の場合について、マスターレンズＬがデ
フオーカス状態にあるとすると、マスターレンズ
Ｌ→クイツクリターンミラーＭ→サブミラー
M′を経由してきた光束はイメージセンサＳ上に
投影される。該イメージセンサＳから自動焦点制
御部１のうちの画像分析処理部、フオーカス条件
判定部、駆動信号発生部を通してマスターレンズ
Ｌの像面でのピントを合わせるためにモータ２の
駆動信号が出力される。該駆動信号によつてモー
タ２が作動し、歯車列３を介してマスターレンズ
Ｌは移動する。この際に歯車３ａの回転によりフ
オトリフレクタ４から第５図ｂに示すようなパル
スが送出され、このパルス数が自動焦点制御部１
内の図示しないレンズパルス変換部で、所要のピ
ント移動量に相当すれば、前記駆動信号発生部は
モータ２に駆動信号を与えるのを止め、マスター
レンズＬは合焦位置に停止する。 Next, the operation of this embodiment having the above configuration will be explained.
First, in the case of the focus position detection device in a single-lens reflex camera shown in FIG.
The light flux that has passed through M' is projected onto the image sensor S. A drive signal for a motor 2 is outputted from the image sensor S through an image analysis processing section, a focus condition determination section, and a drive signal generation section of the automatic focus control section 1 in order to adjust the focus on the image plane of the master lens L. . The motor 2 is actuated by the drive signal, and the master lens L is moved via the gear train 3. At this time, the rotation of the gear 3a causes the photoreflector 4 to send out pulses as shown in FIG.
In the lens pulse conversion section (not shown), when the amount of focus movement corresponds to the required amount, the drive signal generation section stops supplying the drive signal to the motor 2, and the master lens L stops at the in-focus position.
また、第２図の自動露出制御カメラにおける絞
り量検出装置の場合について、シヤツタ速度優先
式自動露出装置においてはレリーズの際に露出制
御回路１０内で被写体輝度情報、フイルム感度情
報およびシヤツタ速度情報等を演算回路で演算処
理し演算絞り情報として出力し比較回路に送られ
る。一方、レリーズとともにモータにより伝動歯
車列８が作動を開始し絞り羽根駆動用歯車７を回
転させると、絞り羽根５を開閉させて絞り量を変
化させる。この絞り量の変化は歯車８ａの回転量
としてフオトリフレクタ９によりパルス数で検出
され、前述と同様な第５図ｂに示すようなパルス
信号が前記比較回路に伝えられる。該比較回路に
おいて演算絞り情報と一致した時点で電磁石１１
が作動し、ストツパーレバー１２がばね１３の力
に抗して時計方向に回動され、その爪部１２ａが
歯車８ａに係合して歯車列８の回動を停止させ、
絞り羽根５を所要の絞り量に設定する。 In addition, in the case of the aperture amount detection device in the automatic exposure control camera shown in FIG. 2, in the shutter speed priority automatic exposure device, subject brightness information, film sensitivity information, shutter speed information, etc. are stored in the exposure control circuit 10 at the time of release. is processed by the arithmetic circuit and output as arithmetic aperture information, which is sent to the comparison circuit. On the other hand, when the transmission gear train 8 starts operating by the motor with the release and rotates the aperture blade drive gear 7, the aperture blades 5 are opened and closed to change the amount of aperture. This change in the amount of aperture is detected by the number of pulses by the photoreflector 9 as the amount of rotation of the gear 8a, and a pulse signal as shown in FIG. 5b similar to that described above is transmitted to the comparison circuit. When the comparison circuit matches the aperture information, the electromagnet 11
is activated, the stopper lever 12 is rotated clockwise against the force of the spring 13, and its pawl 12a engages with the gear 8a to stop the rotation of the gear train 8.
The aperture blades 5 are set to the required aperture amount.
本考案は、以上説明したように自動焦点合わせ
用レンズの移動に連動して回転する歯車および自
動露出制御のための絞り羽根駆動用歯車におい
て、その歯先面と歯底面に反射面を設け、フオト
リフレクタによりそれを検出し歯車の回転量を信
号化したので、パルス信号の周波数を従来の２倍
にすることが簡単にでき、制御分解能を向上させ
うる効果がある。 As explained above, the present invention provides a gear that rotates in conjunction with the movement of an automatic focusing lens and an aperture blade drive gear for automatic exposure control, in which reflective surfaces are provided on the top and bottom surfaces of the teeth. Since this is detected by a photoreflector and the amount of rotation of the gear is converted into a signal, the frequency of the pulse signal can be easily doubled compared to the conventional method, which has the effect of improving control resolution.
第１図は本考案を適用した一眼レフカメラにお
ける自動焦点検出装置の一実施例の構成図、第２
図は同じく自動露出制御装置における絞り量検出
装置の一実施例の構成図、第３図はこれらの検出
装置の要部の説明図でａは従来例、ｂは本考案の
実施例を示し、第４図はそのフオトリフレクタの
特性図、第５図は検出したパルス信号の波形図
で、ａは従来例、ｂは本考案の実施例を示す。
２……モータ、３……レンズ駆動用歯車列、３
ａ……検出用歯車、３ｂ……歯先面、３ｃ……歯
底面、４，９……位置検出装置となるフオトリフ
レクタ、４ａ……発光部、４ｂ……受光部、５…
…絞り羽根、８……伝動歯車列、８ａ……検出用
歯車、１１……電磁石、１２……ストツプレバ
ー。
Figure 1 is a configuration diagram of an embodiment of an automatic focus detection device for a single-lens reflex camera to which the present invention is applied;
The figure is also a block diagram of an embodiment of the aperture amount detection device in the automatic exposure control device, and FIG. FIG. 4 is a characteristic diagram of the photoreflector, and FIG. 5 is a waveform diagram of a detected pulse signal, in which a shows a conventional example and b shows an embodiment of the present invention. 2... Motor, 3... Lens drive gear train, 3
a...detection gear, 3b...tooth top surface, 3c...tooth bottom surface, 4, 9...photoreflector serving as a position detection device, 4a...light emitting section, 4b...light receiving section, 5...
...Aperture blade, 8...Transmission gear train, 8a...Detection gear, 11...Electromagnet, 12...Stop lever.
Claims (1)
力し、その出力により焦点合わせ制御及び露光制
御等を行なうようになしたカメラにおいて、制御
すべき部材を駆動する歯車の歯面を発光部と受光
部とが並列に配置された位置検出装置により検出
する際に、該歯車の歯先面と歯底面とに反射面を
設け、それを検知することにより該歯車の回転量
をパルス信号として検出するようにしたことを特
徴とする制御用パルス発生装置。 In a camera that digitizes various photographic information and inputs it into an arithmetic circuit, and uses the output to perform focusing control, exposure control, etc., the tooth surfaces of the gears that drive the members to be controlled are connected to the light emitting part and the light receiving part. When detecting with a position detection device arranged in parallel, reflective surfaces are provided on the top and bottom surfaces of the gear, and by detecting these, the amount of rotation of the gear is detected as a pulse signal. A control pulse generator characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982194132U JPS5999536U (en) | 1982-12-23 | 1982-12-23 | Pulse generator for camera control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982194132U JPS5999536U (en) | 1982-12-23 | 1982-12-23 | Pulse generator for camera control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5999536U JPS5999536U (en) | 1984-07-05 |
| JPH0224270Y2 true JPH0224270Y2 (en) | 1990-07-03 |
Family
ID=30417367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982194132U Granted JPS5999536U (en) | 1982-12-23 | 1982-12-23 | Pulse generator for camera control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5999536U (en) |
-
1982
- 1982-12-23 JP JP1982194132U patent/JPS5999536U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5999536U (en) | 1984-07-05 |
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