JPH0572468A - Camera - Google Patents

Camera

Info

Publication number
JPH0572468A
JPH0572468A JP3231258A JP23125891A JPH0572468A JP H0572468 A JPH0572468 A JP H0572468A JP 3231258 A JP3231258 A JP 3231258A JP 23125891 A JP23125891 A JP 23125891A JP H0572468 A JPH0572468 A JP H0572468A
Authority
JP
Japan
Prior art keywords
camera
focusing
automatic
diaphragm
width
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.)
Withdrawn
Application number
JP3231258A
Other languages
Japanese (ja)
Inventor
Takao Sasakura
孝男 笹倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3231258A priority Critical patent/JPH0572468A/en
Publication of JPH0572468A publication Critical patent/JPH0572468A/en
Withdrawn legal-status Critical Current

Links

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  • Cameras In General (AREA)
  • Automatic Focus Adjustment (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To prevent the focusing rate of automatic focusing (AF) from lowering by extending the focusing width of the AF and stopping down a diaphragm for several steps when a still video back (SV back) is attached. CONSTITUTION:As to a camera Y, the SV back 7 is attached to the back cover part of the camera which photographs a video by using a silver salt film. An automatic focusing control means A extends the focusing width of the AF when the SV back is attached to the camera Y. At such a time, an automatic exposing control means B executes automatic exposing based on a reference value which is set to a direction where the diaphragm is more stopped down that at the diaphragm value in ordinary automatic exposing. Namely, when the state of the back cover of the camera Y is detected to find that the back cover is the SV back 7, the numerical value of the focusing width used for deciding focusing on an AF action is set larger than that in an ordinary silver salt camera. Since the video is easily blurred when the focusing width is extended, the diaphragm is more stopped down by a couple of steps than at the diaphragm value at actual photographing in order to make the depth of field deep.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明はカメラ、特に銀塩カメ
ラの背ぶた部分にCCD等の撮像素子とその撮像素子か
らの信号を磁気媒体に記録する装置(以下スチルビデオ
バックという)を装着したカメラ(SVカメラ)に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is equipped with an image pickup device such as a CCD and a device for recording signals from the image pickup device on a magnetic medium (hereinafter referred to as a still video back) on the back cover of a camera, particularly a silver halide camera. The present invention relates to a camera (SV camera).

【0002】[0002]

【従来の技術】従来、銀塩フィルムを用いた銀塩カメラ
の背ぶた部分を取りはずし、その部分にCCD等の撮像
素子とその撮像素子からの映像信号を磁気媒体に磁気記
録する装置とを装着したスチルビデオバック(SVバッ
クともいう)がある。
2. Description of the Related Art Conventionally, a back cover portion of a silver salt camera using a silver salt film is removed, and an image pickup device such as a CCD and a device for magnetically recording a video signal from the image pickup device on a magnetic medium are attached to the back cover. There is still video back (also called SV back).

【0003】これは、銀塩カメラのレンズ部やクイック
リターンミラー,シャッタ部等、フィルム部分以外をそ
のまま利用して、SVカメラを形成していた。
In this, an SV camera was formed by using the lens portion, the quick return mirror, the shutter portion, etc. of the silver halide camera, except the film portion as they were.

【0004】[0004]

【発明が解決しようとする課題】以上のように、前記従
来例においては、SVバックにおける撮像素子は、大き
さが1/2インチあるいは2/3インチサイズのものが
多く、銀塩カメラにおける35mmフィルムのフィルムサ
イズよりかなり小さくなり、同じ画角で撮影しようとす
ると倍率が大きくなるという問題点があった。
As described above, in the conventional example described above, the image pickup device in the SV back is often 1/2 inch or 2/3 inch in size, and is 35 mm in the silver halide camera. There is a problem that the film size is considerably smaller than the film size, and the magnification increases when trying to shoot at the same angle of view.

【0005】また、カメラ部の自動焦点調節(AF)セ
ンサはピクセルピッチが約30μmのラインセンサを用
いており、このセンサユニットの大きさ,位置等の設計
は銀塩フィルムをもとに最適化されたものである。
The automatic focus adjustment (AF) sensor of the camera section uses a line sensor with a pixel pitch of about 30 μm, and the design of the size and position of this sensor unit is optimized based on the silver salt film. It was done.

【0006】このAFセンサをユニットごと使用するの
で、そのセンサと撮像素子との対応がとれておらず、A
Fセンサの1ピクセルあたりの撮像素子の面積は銀塩フ
ィルムのそれに比べると大きなものになり、細かな像デ
ータがとれず、合焦しにくいという問題点があった。
Since this AF sensor is used for each unit, there is no correspondence between the sensor and the image pickup device.
The area of the image sensor per pixel of the F sensor is larger than that of the silver salt film, and there is a problem that fine image data cannot be obtained and focusing is difficult.

【0007】この発明は、上記のような問題点を解消す
るためになされたもので、SVバック装着時には、AF
の合焦幅を銀塩カメラのAF幅より広げ、それにより発
生するボケを絞りを数段絞ることで被写界深度を深くし
て押えて、AFの合焦率が低下するのを防止することを
目的とする。
The present invention has been made in order to solve the above problems, and when the SV back is attached, the AF
The focus width of is wider than the AF width of the silver-salt camera, and the blur caused by it is prevented by reducing the aperture by several steps to deepen the depth of field and prevent it from decreasing the AF focus rate. The purpose is to

【0008】[0008]

【課題を解決するための手段】このため、この発明にお
いては、銀塩フィルムを用いて映像の撮影を行うカメラ
の背ぶた部分にスチルビデオバックを装着することがで
きるカメラであって、前記スチルビデオバック装着時に
は、自動焦点調節の合焦幅を拡大する自動焦点制御手段
と、通常の自動露出における絞り値より絞る方向に設定
した基準値にもとづいて自動露出を行う自動露出制御手
段と、を具備してなるカメラにより、前記目的を達成し
ようとするものである。
Therefore, according to the present invention, there is provided a still video camera in which a still video back can be attached to a back cover portion of a camera for photographing an image using a silver salt film. When the video back is attached, the automatic focus control means that expands the focus width of the automatic focus adjustment, and the automatic exposure control means that performs automatic exposure based on the reference value set in the direction that narrows the aperture value in normal automatic exposure The camera provided is intended to achieve the above-mentioned object.

【0009】[0009]

【作用】この発明におけるカメラは、スチルビデオバッ
ク装着時には、自動焦点制御手段(以下AF制御手段と
いう)で自動焦点調節の合焦幅を拡大し、自動露出制御
手段(以下AE制御手段という)で通常の自動露出(A
E)における絞り値より絞る方向に設定した基準値にも
とづいてAEを行う。
In the camera according to the present invention, when the still video back is attached, the focus width of automatic focus adjustment is expanded by the automatic focus control means (hereinafter referred to as AF control means), and the automatic exposure control means (hereinafter referred to as AE control means) is used. Normal automatic exposure (A
AE is performed based on the reference value set in the direction of reducing the aperture value in E).

【0010】[0010]

【実施例】以下、この発明の一実施例を図面に基づいて
説明する。図1はこの発明の一実施例であるカメラの構
成図、図2はこの実施例の動作を制御するフローチャー
トである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a camera which is an embodiment of the present invention, and FIG. 2 is a flow chart for controlling the operation of this embodiment.

【0011】図1において、Yはカメラであり、銀塩フ
ィルムを用いて映像の撮影を行うカメラの背ぶた部分に
スチルビデオバック(撮像素子5と前記撮像素子5から
の信号を磁気媒体に記録する装置)7を装着することが
できるものである。
In FIG. 1, Y is a camera, and a still video back (image sensor 5 and signals from the image sensor 5 are recorded on a magnetic medium on the back cover of the camera for photographing an image using a silver salt film. Device 7) can be mounted.

【0012】Aは自動焦点(AF)制御手段であり、シ
ステムコントロール部(CPU)9で構成され、カメラ
Yがスチルビデオバック装着時には自動焦点調節の合焦
幅を拡大する手段である。Bは自動露出(AE)制御手
段であり、同じくCPU9で構成され、通常の自動露出
(AE)における絞り値より絞る方向に設定した基準値
(プログラム線図)に基づいて自動露出を行う手段であ
る。以上の各手段の詳細は後述する。
A is an automatic focus (AF) control means, which is composed of a system control section (CPU) 9 and is means for expanding the focus width of automatic focus adjustment when the camera Y is equipped with a still video back. Reference numeral B denotes an automatic exposure (AE) control means, which is also constituted by the CPU 9 and is a means for performing automatic exposure based on a reference value (program diagram) set in a direction of narrowing the aperture value in the normal automatic exposure (AE). is there. Details of each of the above means will be described later.

【0013】また、図1において、1はレンズ、2は絞
り、3はミラー、4はシャッタ、8はAFセンサユニッ
トである。
In FIG. 1, 1 is a lens, 2 is a diaphragm, 3 is a mirror, 4 is a shutter, and 8 is an AF sensor unit.

【0014】次にこの実施例の動作を図1および図2を
用いて説明する。図1および図2において、まず、カメ
ラYの裏ブタの状態を検知(ステップ2)して通常の銀
塩カメラの構成であると通常のカメラ動作を行う(ステ
ップ23)。裏ブタがSVバックであると(ステップ2
1Yes)、AF動作において、合焦判定に用いる合焦
幅を通常の銀塩カメラにおける数値よりも広げる(ステ
ップ22)。
Next, the operation of this embodiment will be described with reference to FIGS. In FIG. 1 and FIG. 2, first, the state of the rear cover of the camera Y is detected (step 2), and the normal camera operation is performed if the configuration of the normal silver halide camera is obtained (step 23). If the back pig is an SV bag (step 2
1 Yes), in the AF operation, the focus width used for the focus determination is made wider than the numerical value of a normal silver halide camera (step 22).

【0015】これは前記したように、AFセンサの1ピ
クセルあたりの撮像素子の面積が大きくなり、細かな像
データがとれず、デフォーカス量の計算の誤差が大きく
なり通常カメラ動作における合焦幅だと合焦と判定され
にくくなるからである。
As described above, this is because the area of the image pickup device per pixel of the AF sensor is large, fine image data cannot be obtained, the error in the calculation of the defocus amount becomes large, and the focus width in the normal camera operation is increased. This is because it is difficult to determine that it is in focus.

【0016】このように合焦幅を広げると、合焦と判定
されやすくなる(ステップ24)が、ボケやすくなる。
そのため、被写界深度を深くするため、実際の撮影時の
絞り値より1〜2段絞る(ステップ25)。
When the focus width is widened in this manner, it is easy to determine that the focus is in focus (step 24), but the blur becomes easy.
Therefore, in order to increase the depth of field, the aperture value is narrowed by 1 to 2 steps from the aperture value at the time of actual photographing (step 25).

【0017】このため、この時はシャッタースピード優
先,絞り値優先のAE制御は禁止し、プログラムAE制
御のみを許可する。この場合、使用するプログラム線図
は通常の銀塩カメラの際のプログラム線図よりも全体に
1〜2段絞られたものを用いる。その後SV撮影をする
(ステップ26)。
Therefore, at this time, AE control of shutter speed priority and aperture value priority is prohibited, and only program AE control is permitted. In this case, the program diagram to be used is one that is narrowed by 1 to 2 steps as a whole as compared with the program diagram in the case of a normal silver halide camera. After that, SV photographing is performed (step 26).

【0018】以上のようにSVバックで撮影時には、A
Fの合焦幅を通常の数値より広げ、それにより生じると
考えられるボケを、絞りを通常より1〜2段絞ること
で、被写界深度を深くすることによりおさえることがで
きる。その結果、SVバックの時においても、AFの合
焦率を低下させずに撮影することができる。
As described above, when shooting with the SV back, A
The focus width of F is made wider than the normal value, and the blurring that is considered to be caused by it can be suppressed by increasing the depth of field by narrowing the aperture by 1 to 2 steps. As a result, even during SV back, it is possible to shoot without lowering the focusing rate of AF.

【0019】[0019]

【発明の効果】以上説明したように、この発明ではSV
バック装着時はAFの合焦幅を通常の銀塩カメラのAF
幅よりも広げ、それにより発生するボケを絞りを数段絞
ることで、被写界深度を深くしておさえることができ
る。この結果、AFの合焦率の低下を防止できる効果が
ある。
As described above, according to the present invention, the SV
When attached to the back, the focus width of the AF is set to the AF of a normal silver halide camera.
It is possible to keep the depth of field deep by widening the width rather than the width and narrowing the blur caused by it by several steps. As a result, there is an effect that the reduction of the focusing rate of AF can be prevented.

【図面の簡単な説明】[Brief description of drawings]

【図1】 この発明の一実施例であるカメラの構成図FIG. 1 is a configuration diagram of a camera that is an embodiment of the present invention.

【図2】 この実施例の動作を制御するフローチャートFIG. 2 is a flowchart for controlling the operation of this embodiment.

【符号の説明】[Explanation of symbols]

Y カメラ A 自動焦点制御手段 B 自動露出制御手段 1 レンズ 2 絞り 4 シャッタ 7 SVバックユニット Y camera A automatic focus control means B automatic exposure control means 1 lens 2 aperture 4 shutter 7 SV back unit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 銀塩フィルムを用いて映像の撮影を行う
カメラの背ぶた部分にスチルビデオバックを装着するこ
とができるカメラであって、前記スチルビデオバック装
着時には、自動焦点調節の合焦幅を拡大する自動焦点制
御手段と、通常の自動露出における絞り値より絞る方向
に設定した基準値にもとづいて自動露出を行う自動露出
制御手段と、を具備してなることを特徴とするカメラ。
1. A camera capable of mounting a still video back on a back lid portion of a camera for photographing an image using a silver salt film, wherein a focusing width of automatic focus adjustment when the still video back is mounted. And an automatic exposure control means for performing automatic exposure based on a reference value set in a direction of narrowing the aperture value in normal automatic exposure.
JP3231258A 1991-09-11 1991-09-11 Camera Withdrawn JPH0572468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3231258A JPH0572468A (en) 1991-09-11 1991-09-11 Camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3231258A JPH0572468A (en) 1991-09-11 1991-09-11 Camera

Publications (1)

Publication Number Publication Date
JPH0572468A true JPH0572468A (en) 1993-03-26

Family

ID=16920800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3231258A Withdrawn JPH0572468A (en) 1991-09-11 1991-09-11 Camera

Country Status (1)

Country Link
JP (1) JPH0572468A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007034216A (en) * 2005-07-29 2007-02-08 Fujinon Corp Lens system
US8355626B2 (en) 2010-05-18 2013-01-15 Canon Kabushiki Kaisha Lens-interchangeable camera performing focus control, lens barrel, and program
JP2013061537A (en) * 2011-09-14 2013-04-04 Nikon Corp Camera body, camera system, and program

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007034216A (en) * 2005-07-29 2007-02-08 Fujinon Corp Lens system
US8355626B2 (en) 2010-05-18 2013-01-15 Canon Kabushiki Kaisha Lens-interchangeable camera performing focus control, lens barrel, and program
JP2013061537A (en) * 2011-09-14 2013-04-04 Nikon Corp Camera body, camera system, and program

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Effective date: 19981203