JPH01237629A - Single-lens reflex camera with ae, af and confirming function - Google Patents

Abstract

PURPOSE:To confirm a photographing image at the time of photographing, and also, to obtain the constitution in which an AE sensor and an AF sensor are not placed independently by using one piece of image pickup element as an automatic exposing mechanism AE sensor and an automatic focusing mechanism AF sensor, as well. CONSTITUTION:As for two pieces of half mirrors 5a, 5b its ends are supported so as to be freely rotatable by pins 50a, 50b, and on the reverse side of one half mirror 5a, an AF mirror 11 and an AE mirror 13 are attached, and in a state that the half mirror 5a is inclined, a part of a transmission light in a luminous flux which is made incident through a photographic lens 3 is reflected to an image pickup element 15. To the image pickup element 15, a control circuit 16 for deciding the luminous flux which is made incident on said element and operating AE and AF functions is connected. In such a way, the image pickup element 15 is used as an AE sensor and an AF sensor, when a shutter release is not executed, and is used as an image sensor for confirming an object to be photographed which is photographed, when the shutter release is executed, therefore, each independent sensor becomes unnecessary.

Description

[Detailed description of the invention] <Industrial usage> The present invention relates to a single-lens reflex camera with AE, AF, and confirmation functions, and the present invention relates to a single-lens reflex camera with AE, AF, and confirmation functions. This made confirmation possible.

<Conventional technology> A single-lens reflex camera is equipped with a mirror between the photographing lens and the film surface of the camera body, and this mirror switches between the viewfinder optical system and the photographing system optical system, so the image focused on the film surface is transferred to the viewfinder. There are some features that can be confirmed. In addition, in recent years, compact and high-performance automatic exposure mechanisms (AE) and automatic focusing mechanisms (AF) have been incorporated into single-lens reflex cameras, making it easier to take good photos without poor exposure or out of focus. It has become to.

FIG. 11 is a block diagram of a conventional single-lens reflex camera having AE and AF functions, and this single-lens reflex camera is composed of a photographic lens section 1 and a camera body 2. this house,
The photographic lens section 1 is equipped with a photographic lens 3 and an aperture 4. Inside the camera body 2 is a finder optical system consisting of a mirror 5 that reflects the light beam from the subject, a focus plate 6 where the light reflected by the mirror 5 is focused, a pentaprism 7, and an eyepiece 8. It consists of a photographing optical system consisting of a film 10 located at a focusing position via a plane shutter 9. Further, mirrors and sensors for AE and AF are arranged inside the camera body 2, and an AF mirror 11 is attached to the back surface of the mirror 5 and reflects a partially transmitted light in the opposite direction to the focusing plate 6. In addition, an AF sensor 12 is provided to receive the reflected light from the AFE mirror 11, and an AE mirror 13 or an AE mirror attached to the top of the pentaprism 7 and reflecting a part of the incident light of this prism toward the eyepiece lens 8. An AE sensor 14 is provided to receive the reflected light of 13.

<Problems to be Solved by the Invention> In the conventional reflex camera with AF and AEi functions shown in FIG. 11, it was not possible to immediately check the image imprinted on the film at the time of shooting. In other words, images captured on film could only be confirmed after they were developed and made into photographic prints.

However, there is a desire to immediately check the image recorded on the film at the time of shooting. If this can be done, it will be convenient because it will be possible to check at the time of photographing whether or not the subject was photographed as expected by the photographer, before developing the photograph.

Also, by making this kind of confirmation, you can sort out what needs to be printed and what doesn't before development.

In addition, there is an AFE roller 11 in the camera body 2.
The E Sea 13 is arranged individually, and with this arrangement, the AF
The sensor 12 and the AE sensor 14 are also arranged independently.

Therefore, the manufacture and installation of the mirrors 11 and 13 and the sensors 12 and 14 requires a long wait, and the manufacture, processing, and installation of the sensors 12 and 14 require adjustment, which inevitably increases the number of parts and man-hours required to manufacture the camera. do not have.

In view of the above-mentioned problems, the present invention provides a single-lens reflex camera with AE, AF, and confirmation functions, which allows the user to confirm the captured image at the time of shooting and has a configuration in which the AE sensor and AF sensor are not independently arranged.

Means for Solving the Problems> The present invention, which achieves the above-mentioned object, reflects the light flux from the subject that is incident through the photographic lens toward the focusing plate when the shirt taller is not released, and also causes the shirt taller to be released. When performing this, a mirror structure is rotated to change from the non-shirt release position to another position and guides the light beam in the direction opposite to the reticle and toward the film surface; A sensor mirror that reflects the light flux from the subject that enters through the photographing lens in the direction opposite to the focus plate only when the shirt taller release is not performed, and the mirror whose position changes when the shirt taller release is performed. An image sensor that is arranged at a position where an image is formed by a light beam guided in a direction opposite to the reticle due to its structure and sends out an image signal corresponding to the formed optical image, and when the above-mentioned shirt release is not performed, the above-mentioned It is characterized by comprising an image sensor that receives reflected light from a sensor mirror and becomes an AE or AF sensor.

Function> The image sensor functions as an AE sensor and an AF sensor when the shirt release is not performed, and when the shirt release is performed, it becomes an image sensor for confirming the photographed subject. Therefore, each sensor can be used in common with one image sensor.

EMBODIMENTS> The present invention will now be described in detail with reference to FIGS. 1 to 10. Note that the same parts as in FIG. 11 are given the same reference numerals. In FIG. 1, this single-lens reflex camera includes a taking lens unit 1 having a taking lens 3 and an aperture 4, a finder optical system having a focusing plate 6, a pentaprism 7, and an eyepiece 8, a focal plane shutter 9, and a film. It has an optical system of a photographing system consisting of 10 elements.

In addition, the two half mirrors 5a and 5b have their ends connected to the bin 5.
It is rotatably supported by 0a and 50b. These half mirrors 5a and 5b move in relation to each other, and when the shirt tally is not released (when the shirt tally is not released)
When the half mirror 5a is tilted by the mirror drive mechanism and the half mirror 5b is horizontal as shown in FIG. 1, and the shirt taller is released (at the time of shirt taller release), the half mirror as shown in FIG. 2 is positioned. 5b is inclined and the half mirror 5a is positioned horizontally.

Further, as shown in FIGS. 1 and 3, an AF mirror 11 and an A E mirror 1 are provided on the back surface of one half mirror 5a.
3 is attached, and when the half mirror 5a is tilted, a part of the transmitted light of the light beam incident through the photographic lens 3 is reflected toward the image sensor 15 on the opposite side from the focusing plate 6. It is something that makes you

Here, the image sensor 15 is formed of a solid-state image sensor such as a CCD, and is arranged at a position symmetrical to the focus plate 6 with an extension of the optical axis of the photographic lens in between. The power supply to the solid-state image sensor 15 starts when the AF and AE' functions are activated (when the main switch is turned on or when the shutter button is pressed halfway) and when the shutter button is turned on, and ends when the film 10 starts winding. . During this power supply period, the AFSAEi function and the electronic shutter (described later) operate.

The image sensor 15 determines the light flux incident on it and performs an AE
A control circuit 16 for operating the AF type function is connected, and in the case of AF, this control circuit 16 drives the photographing lens 3 and adjusts its axial position, and in the case of AE, drives the aperture 4 and adjusts its opening degree. Be it. The image sensor 15 also includes a camera control unit 1 that processes image signals.
7. Memory tribe! [8, Display 19 and Printer 2
0 should be connected.

Next, the operation of this embodiment will be explained.

When not performing a shirt release, use a half mirror.
5a and 5b are in the position shown in FIG. For this reason, a part of the light flux of the subject entering through the photographic lens 3 is reflected by the half mirror 5a, and is directed toward the focusing plate 6 to form an image of the subject on the focusing plate 6. Therefore, the photographer can view the subject image through the eyepiece 8 and pentaprism 7 of the finder.

A portion of the light beam that has passed through the half mirror 5 a is reflected by the AE mirror 13 and the AF mirror 11 and forms an image on the image sensor 15 . At this point, the image sensor 15 is
It functions as a sensor and an AF sensor and outputs the state of the received light flux to the control circuit 16, and the control circuit 16 judges the state of this light flux and determines the axial position of the photographing lens 3 for AF and the aperture 4 for AE. Adjust the opening. That is, in AE, as shown in FIG. 4, the aperture 4 is adjusted so that the amount of light (area) is constant (appropriate exposure for the film) for the shutter setting time t. Adjustment is made so that the sensor output is 01 for the set time T.

When the set time is T2 or T3, the sensor output is 02, 0. The amount of light is kept constant so that

In addition, in the case of AF, the example or Figure 5 fat (bl (
When the focus is in front of the film plane as shown in cl (
(referred to as the front bin) (Fig. 5 (ml), when the focus is on the film plane (Fig. 5 (bl)), and when the focus is on the rear of the film plane (referred to as t&bin) (Fig. 5 (C)), respectively. Since the width of the sensor coordinates that receive light and the sensor output also change depending on the state of The focus can be adjusted on the film plane shown in Figure 5 (bl).For AF, there is also a determination method shown in Figure 6.This method takes the X and Y coordinates on the sensor, It is possible to judge whether the front focus is in focus, the back focus is in focus, or whether the light is in focus by the difference in the receiving width between the axis and the Y axis.
The focusing shown in b) can be achieved.

In this way, it is possible to confirm the subject image and perform AE and AF when the shirt release is not performed.

Next, when you perform the shirt tally release, half mirror 5a
, 5b are rotated to the state shown in FIG. 2, and the focal plane shutter 9 is opened. Therefore, a part of the light beam passes through the half mirror 5b, passes through the shutter 9, and reaches the film 10, whereupon the object image is imprinted on the film 10.

On the other hand, the rest of the luminous flux is reflected by the half mirror 5b and heads toward the image sensor 15. In this case, the distance from the image sensor 15 to the half mirror 5b is the distance from the focusing plate 6 to the half mirror 5b.
Since the distance is equal to the distance to the center, a subject image is formed on the image sensor 15 by the light beam. At this time, the image sensor 15 is being supplied with power, and the focal plane shutter 9
In order to operate the electronic shutter in synchronization with the shutter timing of
Send out. The image signal A is processed by the camera control unit 17 and becomes a video signal V.
is stored in the -H memory device 18 and then read out,
It is sent to the display 19 and printer 20.

As a result, the same subject image captured on the film 10 by pressing the shutter button can be immediately displayed on the display 19 or printed as a hard copy using the printer 20, allowing the user to confirm what kind of image it will be at the time of shooting. .

Here, the electrical system from the image sensor 15 to the display 19 will be explained.

First, the operation of the image sensor 15 alone, especially the electronic shutter, will be explained based on the time chart of FIG. 7. As shown in FIG. 7, when the pulse P generated by pressing the shutter button is output, a sweep pulse P is input to the image sensor 15, and each time this pulse P is input, the accumulated charge is drained from the overflow drain. sent to and disappear. When the shutter button is pressed and the focal plane shutter 9 is operated to generate a front film synchro pulse P4, a first successive pulse P5 is input to the image sensor 15 in synchronization with this.

At this time, since the sweep pulse P3 continues to be input to the image sensor 15, the image signal A is not output from the image sensor 15. The input of the sweep pulse P3 is temporarily stopped at the timing when the successive pulse P5 falls. Then, when a time T has elapsed since the input of the first successive pulse P, the second read pulse P6 is input to the image pickup device 15. The above time T
3 may be a time corresponding to the shutter speed of the camera body at that time, or may be a predetermined fixed time. By inputting successive pulses P, the charge accumulated during time T is output from the image sensor 15, and this is output as an image signal A.

When the image signal A is output, the sweep pulse P is again input to the image sensor 15, and the pulse P for operating the memory device 18 is output. In this way, since the image signal A is formed by the charges accumulated when the focal plane shutter 9 is opened, the image recorded on the film 10 and the image reproduced from the image signal A on the display 19 or the like are the same.

Next, an example of the overall configuration and operation of the electrical system will be explained based on FIG. 8. Driver 17alt of camera control unit 17, ti output pulse P3 and readout pulse p
, , p6 (see FIG. 7) are sent to the image sensor 15. The image signal A output from the image sensor 15 is sent to the signal processing circuit 17.
The signal is processed in step b to produce a luminance signal Y and two types of color difference signals (R
-Y) (B-Y). The encoder 17c performs modulation, addition of a synchronizing signal S, mixing, etc., and outputs a video signal V.

Note that the synchronization signal generator 17d outputs the synchronization signal S, and the timing generator 17e outputs the timing signal to the driver 17a.
and sends it to signal processing port #17b.

When a memory write start pulse P7 (see FIG. 7) is output from the memory controller 18a of the memory device is,
The video signal Vle is converted into a digital signal by the A/D converter 18b and stored in the memo+J 18c. memory 1
The storage capacity of 8c may be sufficient to store at least - images, and may be increased as necessary. When displaying on the display 19 or copying on the printer 20, information is read from the memory 18c, converted into an analog signal by the D/A converter PJ 18d, and then sent to the display 19 or printer 20.

Next, a second embodiment of the half mirror will be described with reference to FIG. 9, which shows the main parts thereof. As shown in the figure, in the second embodiment, one half mirror 5 is used instead of two eight-frame mirrors. And this half mirror
5 is rotatably supported at its center by a pin 50, and an AE mirror 13 and an AF mirror 11 are attached to the back surface of this half mirror 5. When the shirt is not released, the half mirror 5 is activated by the mirror drive mechanism.
is positioned in the state shown in FIG. At the same time, a part of the light beam that has passed through the half mirror 5 is reflected by the AF mirror 11 and the AEE mirror 13, and is imaged on the image sensor 15. On the other hand, at the time of shutter release, the half mirror is moved by the mirror drive mechanism. 5 is the 9th
It is positioned in the state shown in FIG.
incident on . In this way, an image signal containing as information the same subject image captured on the film 10 is output from the image sensor 15. It should be noted that during shirt release, the AF mirror 11 and the AE mirror 13 are positioned away from the surface of the film 10 so as not to adversely affect the photographed image.

A third embodiment of the half mirror of the present invention will be described with reference to FIG. 10, which shows the main parts thereof. As shown in the figure, the third embodiment has a half mirror 5a and a half mirror 5b joined together, and the half mirror 5a is rotatably supported by a bin 50. When the shirt is not released, the mirror drive mechanism positions the mirrors 5a and 5b in the state shown in FIG.
It is partially reflected and directed toward the focusing plate 6, and forms a subject image on the focusing plate 6. At the same time, part of the light beam that has passed through the half mirror 5a is reflected by the AFE mirror 11 and the AEE mirror 13, and is imaged on the image sensor 15. On the other hand, when the shirt is released, the mirror 5a is activated by the mirror drive mechanism.

5b in the position shown in Figure 9 tb).

As a result, a part of the light flux passes through the half mirror 5b and reaches the film 10, and the remaining light flux is reflected by the half mirror 5b and enters the image pickup device 15. Thus film 10
The image sensor 15 outputs an image signal containing as information the same subject image as that taken in .

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, an image signal indicating the same image as the image captured on the film is outputted from the image sensor. Not only can the photographed image be confirmed at the time of imaging by monitoring, but also the image sensor can serve as an AF sensor and an AE sensor, so independent sensors are not required, and the number of parts and manufacturing man-hours can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the first embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operating state of the main parts of the first embodiment, and FIG. 3 is the operation of FIG. 1. A simplified perspective view of the state, FIG. 4 is an explanatory diagram of the AE type function, FIG. A time chart for explanation, FIG. 8 is a block circuit diagram showing the electrical system of the first embodiment, and FIG. 9 is an explanatory diagram showing the operating state of the main parts of the second embodiment of the present invention. , FIG. 10 is an explanatory diagram showing the operating state of the main parts of the third embodiment of the present invention, and FIG. 11 is a configuration diagram of the conventional example. In the figures, 1 is a photographic lens section, 2 3 is a camera body, 3 is a photographing lens, 4 is an aperture, 5.5a and 5b are half mirrors) 9 is a focal plane shutter, 11 is an AF mirror, 13 is an AE mirror, 15 is an image sensor, and 16 is a control circuit. Patent application Agent: Fuji Photo Film Co., Ltd.

Claims (1)

[Claims] When the shutter is not released, the light flux from the subject entering through the photographic lens is reflected toward the focus plate, and when the shutter is released,
a mirror structure that is rotated to change from a non-shutter release position to another position and guides the light beam in a direction opposite to the reticle and toward the film surface; Only when the shutter release is not performed, there is a sensor mirror that reflects the light flux from the subject that enters through the photographic lens in the direction opposite to the focus plate, and a mirror structure whose position changes when the shutter release is performed. An image sensor that is arranged at a position where an image is focused by a light beam guided in a direction, and that sends an image signal corresponding to the formed optical image, and that emits the reflected light from the sensor mirror when the shutter release is not performed. A single-lens reflex camera with AE, AF, and confirmation functions, characterized in that it is equipped with an image sensor that serves as an AE and AF sensor.